2013年1月29日星期二
Research on AC Servo Control Computation Simulation and Experiment Platform Build
Research on AC Servo Control Computation Simulation and Experiment Platform Build
With the demand of high-powered AC servo product increasing, the AC servo system based on SCM (single-chip microcontroller) is more and more widely used. For digitized AC servo system, it needs software to support it’s closed-loop control. Its control quality is decided by the program of control computation directly. So the program should be tested strictly and time after time when developing it. For the test is long, unefficient and costly with hardware, it’s adverse for the AC servo product to compete Neodymium Magnets
http://www.999magnet.com/products/110-sintered-neodymium-magnets in the intense market.The present paper’s goal is to put forward a new way to test the program by means of multi-cyclical closed-loop control computation simulation. For this paper, it’s an exploration for the improvement of the program test. In this paper, a new idea of the program test is put forward. Its concrete method is: Firstly, precondition the program code. Secondly, collect information which will be put use to simulate. Lastly, make use of the information collected to simulate to compute, and associate with the controlled object’s program module to carry out the multi-cyclical closed-loop simulation. This method‘s realization will make the time and cost of A.C. servo system’s development reduce greatly, so it will make sense for the research and http://www.999magnet.com/products/110-sintered-neodymium-magnets the practical application. In this paper, the AC servo system for experiment is based on SCM UPD70F3184, V850 series which produced by NEC. This equipment will be used to validate the new way of program test. Not only, this system provides the experiment platform for the method of simulating to confirmed, but it makes author to strengthen to understand the AC servo system. The research and summary for AC servo system will laid the rationale for the simulation of control computation.Based on above work, an emulator used to carry out the multi-circle closed–loop simulation for the control computation program., and the AC servo system is put use to confirm its feasibility.
基于Rogowski线圈12KV电流传感器研制
基于Rogowski线圈12KV电流传感器研制
Current transformers are important component for current measurement and relaying protection in power system. With the development of power system, on one hand, the capacity of the power system is increasing very rapidly and the system current becomes larger and larger. On the other hand, with the optimization of the administration and allocation of the power energy, the traditional CT can’t meet the demand. Our company’new product(VSM) is very urgent to develop a new type of CT to meet such requirement.neodymium prices
http://www.999magnet.com/products/142-neodymium-prices According to the actuality of the present research on CT, this paper introduces the measurement principle of Rogowski coil and analyzes the factor that influence the precision of measurement, we bring forward a new design scheme based on the Rogowski coil. In this design, the protection in short circuit failure and the measurement in normal condition are both fulfilled. It can also communicate with the computer through the communicating interface, sending the parameter of the system current and accepting the instruction.In order http://www.999magnet.com/products/142-neodymium-prices to validate the rationality of study, the rogowski coil was designed and manufactured. The controller based on STC89C51, including the hardware and the software, are designed according to the measurement and control demand of system. The CT worked well through the experimental test. According to the causation of the error, the adjustment part is adopted in the design. For instance, the screen cover for rogowski coil are designed. In the processing of signal, the adjustment part is adopted. In the programming of software we put forward the methods to solve these problems. This can make the system more secure and reliable.Based on the research in theory, the prototype of rogowski coil CT was manufactured and tested, the practicability was validated.
2013年1月25日星期五
Research of Fuzzy Self-tuning 2DOF-PID Controller for PMSM
PMSM的模糊自调整二自由度控制器的研究
Research of Fuzzy Self-tuning 2DOF-PID Controller for PMSM
The PMSM servo-system is widely applied to high performace driven field,such as flexible manufacture,CNC machinary tools,elevator adjust-speed etc. the PMSM has many individual features because of its structure and operation. A this paper the mathematical model and controller of PMSM are studied.The traditional PID control is abroad used to magnetic materials
http://www.999magnet.com the motion control field for its simple mechanism and its flexible structure.But between the system tracking and the anti-disturbance performance,it can not find the better balance, an its parameters adjustment depend on the accurate model of the controlled process: the more clear machanism analysis of the controlled process is recognized, the more accurate mathematical model is developed, the more appropriate parameters are tuned, and the better control results are reached.However, the PMSM variables have been strongly coupled,at this time the system is non-linear, time varying process, it is difficult to describe the system with mathematical model. For these features of PMSM, in this thesis, the two-degree-of-freedom(2-DOF)PID control is introduced, one of the intelligent control-Fuzzy technique is added. Several control schemes are introduced and presented as follows:(1) To improve the traditional PID control which can not keep the system tracking and the anti-disturbance performance in good condition simultaneously, the necessity to use the new type of 2-DOF PID control in drive systems is illustrated. furthermore, the advanced-two-degree-of-freedom PID and the super-two-degree-of-freedom PID are provided. The simulation results demonstrate that these two methods solved the mentioned problem of the conventional PID control.(2) Integrate the Super-two-degree-of-freedom PID control with fuzzy techniques, a self-tuning PID controller bassed on fuzzy inference is designed. On-line automatically tuned parameters are realized at different states. Many simulation experiments have done are proven the controller can overcome model mismatch, and it is strongly adaptability and robustness.
Research of Fuzzy Self-tuning 2DOF-PID Controller for PMSM
The PMSM servo-system is widely applied to high performace driven field,such as flexible manufacture,CNC machinary tools,elevator adjust-speed etc. the PMSM has many individual features because of its structure and operation. A this paper the mathematical model and controller of PMSM are studied.The traditional PID control is abroad used to magnetic materials
http://www.999magnet.com the motion control field for its simple mechanism and its flexible structure.But between the system tracking and the anti-disturbance performance,it can not find the better balance, an its parameters adjustment depend on the accurate model of the controlled process: the more clear machanism analysis of the controlled process is recognized, the more accurate mathematical model is developed, the more appropriate parameters are tuned, and the better control results are reached.However, the PMSM variables have been strongly coupled,at this time the system is non-linear, time varying process, it is difficult to describe the system with mathematical model. For these features of PMSM, in this thesis, the two-degree-of-freedom(2-DOF)PID control is introduced, one of the intelligent control-Fuzzy technique is added. Several control schemes are introduced and presented as follows:(1) To improve the traditional PID control which can not keep the system tracking and the anti-disturbance performance in good condition simultaneously, the necessity to use the new type of 2-DOF PID control in drive systems is illustrated. furthermore, the advanced-two-degree-of-freedom PID and the super-two-degree-of-freedom PID are provided. The simulation results demonstrate that these two methods solved the mentioned problem of the conventional PID control.(2) Integrate the Super-two-degree-of-freedom PID control with fuzzy techniques, a self-tuning PID controller bassed on fuzzy inference is designed. On-line automatically tuned parameters are realized at different states. Many simulation experiments have done are proven the controller can overcome model mismatch, and it is strongly adaptability and robustness.
Study of Ring Linear Motor Direct Drive Control System Used in Roller Coaster
Study of Ring Linear Motor Direct Drive Control System Used in Roller Coaster
With the improvement of living standards, the quality of recreational demands higher .The roller coaster is the recreational facilities that are necessary for large playground. Traditional roller coaster wide area, the high cost of the launch is not controllable. In order to pursue the roller coaster the efficiency and the strong irritating quality, the people continuously are seeking a better structure and the launch technology. This article proposed one kind of new structure and the launch Neodymium Magnets http://www.999magnet.com/products/110-sintered-neodymium-magnets technology ring-like roller coaster permanent magnetism brushless the direct current straight line motor-driven the ring-like roller coaster. The article mainly study the roller coaster launch technology and the ring-like straight line brushless the direct current machine the design and the control technology.The principal elements are as follows :The article first consulted and summarized the straight line electrical machinery characteristic as well as function in the transportation application, obtained that the brushless direct current straight line electrical machinery is suit to actuate the roller coaster theconclusion.In explaining ring linear brushless DC motor based on the basic structure and principles. Ring design based on ring linear brushless DC motor driven roller coaster of the structure and section power supply.In explaining the basic http://www.999magnet.com/products/110-sintered-neodymium-magnets principles of infinite element method based on using ANSYSsoftware to ring DC linear motors modeling, analysis of the magnetic field distribution and thrust. Followed by the establishment of a ring linear brushless DC motor linear mathematical model.PID algorithm is the most widely used and most mature industries algorithm. In the PID operation, the output has the possibility to surpass thescope, moreover differentiator to deviation sudden change is very sensitive, and easy to create the control performance the instability, this article uses the advanced version PID algorithm - to meet limit weaken the integration and differential equation.The control system of the roller coaster with DSPTM320LF2407, introduces double closed-loop (velocity loop and current loop) control, the speed control circuit design, the current detection circuit, the motor electrical power supply circuit. and has compiled complete software, then unified the hardware to carry on the debugging, initially has realized the electrical machinery change phase operation and the electrical machinery subsection control strategy.
With the improvement of living standards, the quality of recreational demands higher .The roller coaster is the recreational facilities that are necessary for large playground. Traditional roller coaster wide area, the high cost of the launch is not controllable. In order to pursue the roller coaster the efficiency and the strong irritating quality, the people continuously are seeking a better structure and the launch technology. This article proposed one kind of new structure and the launch Neodymium Magnets http://www.999magnet.com/products/110-sintered-neodymium-magnets technology ring-like roller coaster permanent magnetism brushless the direct current straight line motor-driven the ring-like roller coaster. The article mainly study the roller coaster launch technology and the ring-like straight line brushless the direct current machine the design and the control technology.The principal elements are as follows :The article first consulted and summarized the straight line electrical machinery characteristic as well as function in the transportation application, obtained that the brushless direct current straight line electrical machinery is suit to actuate the roller coaster theconclusion.In explaining ring linear brushless DC motor based on the basic structure and principles. Ring design based on ring linear brushless DC motor driven roller coaster of the structure and section power supply.In explaining the basic http://www.999magnet.com/products/110-sintered-neodymium-magnets principles of infinite element method based on using ANSYSsoftware to ring DC linear motors modeling, analysis of the magnetic field distribution and thrust. Followed by the establishment of a ring linear brushless DC motor linear mathematical model.PID algorithm is the most widely used and most mature industries algorithm. In the PID operation, the output has the possibility to surpass thescope, moreover differentiator to deviation sudden change is very sensitive, and easy to create the control performance the instability, this article uses the advanced version PID algorithm - to meet limit weaken the integration and differential equation.The control system of the roller coaster with DSPTM320LF2407, introduces double closed-loop (velocity loop and current loop) control, the speed control circuit design, the current detection circuit, the motor electrical power supply circuit. and has compiled complete software, then unified the hardware to carry on the debugging, initially has realized the electrical machinery change phase operation and the electrical machinery subsection control strategy.
2013年1月23日星期三
回旋速调管中的电子枪的设计
回旋速调管中的电子枪的设计
Gyro-devices are important sources for millimeter wave and sub-millimeter withthe characteristics of high peak power, high average power, high efficiency andsuitability bandwidth and so on. Especially gyrotron has the superiorities high peakpower and high average power with other apparatus. So gyrotron is vastly applied inmany areas, such as power source of millimeter wave high capability radar, millimeterwave weapons system, millimeter wave communication plasma heating, electroncountermeasure. Especially in later thirty years, gyrotron has been played much respectin magnetic materials America, Russia, England, France, Japan, German and so on. Interiorly, the UESTCHigh Power Microwave Laboratory has studied gyrotron since the late 1970s. At2001, our group leaded has successfully developed the first Ka band third harmonicgyrotron with permanent magnetic field system in the world and reach advanced levelinternationally. Gyrotron electron gun provides the helical ring beam,
The beamcharacteristics affect interaction output power and efficiency directly. Combinging withthe prospect of our laboratory, design the small-orbit electron gun and the large-orbitelectron gun, Especially stress the design and study of the large-orbit electron gun.The main works of the dissertation are listed as following:First, know the theoretical basis and software use of EGUN, MAGIC. Representthe theory and calculation method of electron optics.Second, represent the http://www.999magnet.com operation principle of the gyrotron electron gun and makethe detailed analyse. Represent the initial design method and optimization means.Third, modulate the small-orbit electron gun and obtain a series of significativeinclusions. Study shows finishing initial design of gun we can optimize the beamperformance by adjusting magnetic field distribution, gun geometry, cathode magneticfield, magnetic field compression ratio, anode voltage and so on.Fourth, set up the model of the large-orbit electron gun, and make theoreticalanalysis and design of the large-orbit electron gun. Due to applying large-orbit electrongun, the velocity spread is lower because of smaller influence of space charge compared with small-orbit electron gun. In the interaction region this beam is easy to startoscillation and reject mode competition effectively.
Gyro-devices are important sources for millimeter wave and sub-millimeter withthe characteristics of high peak power, high average power, high efficiency andsuitability bandwidth and so on. Especially gyrotron has the superiorities high peakpower and high average power with other apparatus. So gyrotron is vastly applied inmany areas, such as power source of millimeter wave high capability radar, millimeterwave weapons system, millimeter wave communication plasma heating, electroncountermeasure. Especially in later thirty years, gyrotron has been played much respectin magnetic materials America, Russia, England, France, Japan, German and so on. Interiorly, the UESTCHigh Power Microwave Laboratory has studied gyrotron since the late 1970s. At2001, our group leaded has successfully developed the first Ka band third harmonicgyrotron with permanent magnetic field system in the world and reach advanced levelinternationally. Gyrotron electron gun provides the helical ring beam,
The beamcharacteristics affect interaction output power and efficiency directly. Combinging withthe prospect of our laboratory, design the small-orbit electron gun and the large-orbitelectron gun, Especially stress the design and study of the large-orbit electron gun.The main works of the dissertation are listed as following:First, know the theoretical basis and software use of EGUN, MAGIC. Representthe theory and calculation method of electron optics.Second, represent the http://www.999magnet.com operation principle of the gyrotron electron gun and makethe detailed analyse. Represent the initial design method and optimization means.Third, modulate the small-orbit electron gun and obtain a series of significativeinclusions. Study shows finishing initial design of gun we can optimize the beamperformance by adjusting magnetic field distribution, gun geometry, cathode magneticfield, magnetic field compression ratio, anode voltage and so on.Fourth, set up the model of the large-orbit electron gun, and make theoreticalanalysis and design of the large-orbit electron gun. Due to applying large-orbit electrongun, the velocity spread is lower because of smaller influence of space charge compared with small-orbit electron gun. In the interaction region this beam is easy to startoscillation and reject mode competition effectively.
Study of Motion Controller Based on TMS320F2812
Study of Motion Controller Based on TMS320F2812
In the latest years, with the appearance of some control methods such as vector control and direct torque control, the dynamic and static performance of motion control system have got great improvements. Because complicated real-time computing is needed for those new control theories including fuzzy control, neural networks control, sliding mode variable structure control, adaptive control and expert control, the microprocessor with higher performance is necessary for the system realization. TMS320F2812 is the most advanced DSP chip applying to motion control which is recently produced by TI. TMS320F2812 is compatible with the F24x/240 series DSP chips. In Neodymium Magnets addition, the computing speed is more quickly, the memory capacity of data and program is bigger, the integration degree is higher and the A/D transition is more accurate and rapid.The system characteristic of vector control and direct torque control is analyzed, and the dynamic and static performance is researched in this paper. Then the AC stepping drive theory is deeply analyzed and studied on these bases. The AC stepping drive is a new research branch which is formed with the development of motion control. It is a new-type mode of drive which is powered by static frequency converter under the control of microprocessor to make the stator magnetic motive force motion discretely and then the http://www.999magnet.com/products/110-sintered-neodymium-magnets position and speed output is got from the axis of motor. The AC stepping drive control combine different modes of drives such as position control, speed control, servo control and etc. so that the AC stepping drive control system with high performance is realized.
A new-type motion control system is researched and designed in the paper. The controller applies TMS320F2812 which is a powerful 32-bit fixed point DSP chip as its control core, and can apply AC stepping control theory. First introduces the hardware design and construction of the system. Then illuminates the software realization of the step-motion control, C language is used for designing the software. Experimental results are presented, and it is confirmed that the new control system based on TMS320F2812 is able to achieve complex arithmetic, has nice control performance.
In the latest years, with the appearance of some control methods such as vector control and direct torque control, the dynamic and static performance of motion control system have got great improvements. Because complicated real-time computing is needed for those new control theories including fuzzy control, neural networks control, sliding mode variable structure control, adaptive control and expert control, the microprocessor with higher performance is necessary for the system realization. TMS320F2812 is the most advanced DSP chip applying to motion control which is recently produced by TI. TMS320F2812 is compatible with the F24x/240 series DSP chips. In Neodymium Magnets addition, the computing speed is more quickly, the memory capacity of data and program is bigger, the integration degree is higher and the A/D transition is more accurate and rapid.The system characteristic of vector control and direct torque control is analyzed, and the dynamic and static performance is researched in this paper. Then the AC stepping drive theory is deeply analyzed and studied on these bases. The AC stepping drive is a new research branch which is formed with the development of motion control. It is a new-type mode of drive which is powered by static frequency converter under the control of microprocessor to make the stator magnetic motive force motion discretely and then the http://www.999magnet.com/products/110-sintered-neodymium-magnets position and speed output is got from the axis of motor. The AC stepping drive control combine different modes of drives such as position control, speed control, servo control and etc. so that the AC stepping drive control system with high performance is realized.
A new-type motion control system is researched and designed in the paper. The controller applies TMS320F2812 which is a powerful 32-bit fixed point DSP chip as its control core, and can apply AC stepping control theory. First introduces the hardware design and construction of the system. Then illuminates the software realization of the step-motion control, C language is used for designing the software. Experimental results are presented, and it is confirmed that the new control system based on TMS320F2812 is able to achieve complex arithmetic, has nice control performance.
2013年1月21日星期一
A Design of Test and Analysis System of Servo Control
A Design of Test and Analysis System of Servo Control
This thesis introduced the design on a servo control system performance analysis and on-line system model identification. With the fast development of modern science, motion control, especially, the high speed high precision servo control is widely used in many fields of high technology. In order to improve the performance of servo control system, it is necessary to acquire the accurate system model and analyze system’s performance. Generally, the analysis of magnetic materials on-line system with the load is harder than off-line. But on-line analysis is helpful for application to set up proper parameter.First, the model of typical speed servo system is set up. The time and frequency domain index of servo control system and their influence on system testing is analyzed, and a method of frequency analysis-Fourier Transform and it’s fast arithmetic-FFT are introduced. Then the theory of correlative identification and how to use it in identifying the pulse response of servo control system is introduced. Finally, a hardware platform is established for data sampling and processing. Based on Ti’s CCS as development environment, C language is used to code the main program. In software the whole test system is http://www.999magnet.com separated into three parts, which are the time and frequency domain analysis of servo control system, the harmonic analysis of line voltage and the identification of pulse response of servo control system.In experiment, a high speed and high precision servo control system formed by Huazhong numeric control company’s motor driver HSV-16D-050 and Wuhan Dengqi company’s permanent magnet motor GK-7080-6AC61-FE is chosen as test object. The experiment results show that this test system can perform the desired analysis and test function.
This thesis introduced the design on a servo control system performance analysis and on-line system model identification. With the fast development of modern science, motion control, especially, the high speed high precision servo control is widely used in many fields of high technology. In order to improve the performance of servo control system, it is necessary to acquire the accurate system model and analyze system’s performance. Generally, the analysis of magnetic materials on-line system with the load is harder than off-line. But on-line analysis is helpful for application to set up proper parameter.First, the model of typical speed servo system is set up. The time and frequency domain index of servo control system and their influence on system testing is analyzed, and a method of frequency analysis-Fourier Transform and it’s fast arithmetic-FFT are introduced. Then the theory of correlative identification and how to use it in identifying the pulse response of servo control system is introduced. Finally, a hardware platform is established for data sampling and processing. Based on Ti’s CCS as development environment, C language is used to code the main program. In software the whole test system is http://www.999magnet.com separated into three parts, which are the time and frequency domain analysis of servo control system, the harmonic analysis of line voltage and the identification of pulse response of servo control system.In experiment, a high speed and high precision servo control system formed by Huazhong numeric control company’s motor driver HSV-16D-050 and Wuhan Dengqi company’s permanent magnet motor GK-7080-6AC61-FE is chosen as test object. The experiment results show that this test system can perform the desired analysis and test function.
2013年1月20日星期日
The Research and Application of Feedback System in Frequency Conversion Control System
The Research and Application of Feedback System in Frequency Conversion Control System
As frequency conversion can save energy and has high efficiency , more and more home appliance use this technology . Brushless Direct Current Motor(DCBLM) has extensive applications due to its excellent performances.This paper discusses the sensorless control system for DCBLM using TMP88PH40 MCU,and proposes the hardware circuit and software Neodymium Magnets control project based on it.At the same time,this paper also discusses control system for temperature automation using TMP86C807 MCU.The paper summarizes the developments and applications of the frequency conversion .Then , introduce the applications of the DCBLM .In the chapter about holistic structure analysis for the control system,the paper applies the modular introduce principle, designs the hardware control system based on the core processor TMP88PH40 including power circuit、MCU control circuit、drive circuit and position detection circuit.The paper also analyses the Pulse Amplitude Modulation(PAM)、Pulse Width Modulation(PWM) control methods which are widely used in DC frequency conversion technology. Then it introduce the software control of DCBLM.In the structure of temperature feedback , base on holistic structure for the control system, that design hardware circuit including display , key, memory, communications.In the chapter about system software design, based on the system software of the MCU TMP88PH40, that introduced the fuzzy control method. Then, using temperature feedback http://www.999magnet.com/products/110-sintered-neodymium-magnets software control making the system can automating reach the temperature which ser it before.In the chapter about analysis for experiment results, the paper validates the theory about temperature control system through the waveforms picked from the experiments when the DCBLM control system worked normally. The experiment results indicates the sensorless DCBLM control system satisfies the requirement of stepless speed change. Finally,the paper summarizes the former work and the improvement of the project,prospects the problems and further work we have to deal.
As frequency conversion can save energy and has high efficiency , more and more home appliance use this technology . Brushless Direct Current Motor(DCBLM) has extensive applications due to its excellent performances.This paper discusses the sensorless control system for DCBLM using TMP88PH40 MCU,and proposes the hardware circuit and software Neodymium Magnets control project based on it.At the same time,this paper also discusses control system for temperature automation using TMP86C807 MCU.The paper summarizes the developments and applications of the frequency conversion .Then , introduce the applications of the DCBLM .In the chapter about holistic structure analysis for the control system,the paper applies the modular introduce principle, designs the hardware control system based on the core processor TMP88PH40 including power circuit、MCU control circuit、drive circuit and position detection circuit.The paper also analyses the Pulse Amplitude Modulation(PAM)、Pulse Width Modulation(PWM) control methods which are widely used in DC frequency conversion technology. Then it introduce the software control of DCBLM.In the structure of temperature feedback , base on holistic structure for the control system, that design hardware circuit including display , key, memory, communications.In the chapter about system software design, based on the system software of the MCU TMP88PH40, that introduced the fuzzy control method. Then, using temperature feedback http://www.999magnet.com/products/110-sintered-neodymium-magnets software control making the system can automating reach the temperature which ser it before.In the chapter about analysis for experiment results, the paper validates the theory about temperature control system through the waveforms picked from the experiments when the DCBLM control system worked normally. The experiment results indicates the sensorless DCBLM control system satisfies the requirement of stepless speed change. Finally,the paper summarizes the former work and the improvement of the project,prospects the problems and further work we have to deal.
Study of the Rare Earth Giant Magnetostrictive Current Transformer
Study of the Rare Earth Giant Magnetostrictive Current Transformer
Giant Magnetostrictive Material (GMM) is another new function material together with rare earth permanent magnetic material、rare earth element luminescent material and high temperature supercoducting material. In the action of definite magnetic field GMM has awfully lardge length or bulk transformation compared with traditional nickel group and iron group magnetic materials magnetostrictive material, it’s magnetostrictive coefficient can reach 2500ppm.In this paper, the author put forward a new train of thoughts to design electronic Current Transformers; namely, applied GMM in electronic Current Transformers. The basic idea of this design is: when in the action of magnetic field, the length of the GMM stick will chang, the output light from the fiber-optic sensing probe ( single mode pigtail + Grin-lens ) be reflected by one side of GMM and entered into fiber-optic sensing probe second time, the light force will be modulated, then the output power will change. When deal with the output light through photoelectric conversion and other relative disposal, we can know the electric current loaded in the drive winding from the output voltage and then realized real time supervise the exterior current.In this paper, the author presented two schemes of the current transformer, photoelectricity mode and all-optical mode; http://www.999magnet.com designed the related parameter of the inspired magnetic field and bias magnetic field; Analyzed the sensing part, photoelectric conversion part, and give the in-out characteristic curve of the two systems; finally, cometo the conclusion that all-optical mode current transformer has definite practical use.The fiber-optic sensing probe and photoelectric conversion parts also can realize themicro displacement test, this is a new method to test the micro displacement, it has many merits such as has a high precision and good reliability and so on.
Giant Magnetostrictive Material (GMM) is another new function material together with rare earth permanent magnetic material、rare earth element luminescent material and high temperature supercoducting material. In the action of definite magnetic field GMM has awfully lardge length or bulk transformation compared with traditional nickel group and iron group magnetic materials magnetostrictive material, it’s magnetostrictive coefficient can reach 2500ppm.In this paper, the author put forward a new train of thoughts to design electronic Current Transformers; namely, applied GMM in electronic Current Transformers. The basic idea of this design is: when in the action of magnetic field, the length of the GMM stick will chang, the output light from the fiber-optic sensing probe ( single mode pigtail + Grin-lens ) be reflected by one side of GMM and entered into fiber-optic sensing probe second time, the light force will be modulated, then the output power will change. When deal with the output light through photoelectric conversion and other relative disposal, we can know the electric current loaded in the drive winding from the output voltage and then realized real time supervise the exterior current.In this paper, the author presented two schemes of the current transformer, photoelectricity mode and all-optical mode; http://www.999magnet.com designed the related parameter of the inspired magnetic field and bias magnetic field; Analyzed the sensing part, photoelectric conversion part, and give the in-out characteristic curve of the two systems; finally, cometo the conclusion that all-optical mode current transformer has definite practical use.The fiber-optic sensing probe and photoelectric conversion parts also can realize themicro displacement test, this is a new method to test the micro displacement, it has many merits such as has a high precision and good reliability and so on.
2013年1月17日星期四
Weakening the Cogging Torque of Flux Reversal Machine and the Impact on Electromagnetic Torque
Weakening the Cogging Torque of Flux Reversal Machine and the Impact on Electromagnetic Torque
Flux reversal machine (FRM) is a special doubly salient permanent magnet machine. By this time, it is not been comprehensive studied, whether on the structure or the performance. The shortages restrict further development of FRM. Cogging torque ripple is one of the problems that have not been solved. There have been some methods of weaking the cogging torque, and can weaken cogging torque well, but the shortcomings made them unpractical to produce. Neodymium Magnets So this thesis studies the methods of weakening cogging torque of FRM and the impacts on electromagnetic torque. Based on the existing research results and considering the characteristics of FRM, a new effective method is proposed to weaken cogging torque of FRM. It uses rotor teeth alternative and subsective structure. This method makes use of the rule of variety of cogging torque with rotor teeth change, and the cogging torque of two parts of FRM have opposite phase, so the total cogging torque is weakened.Finite element method is used to analyse the electromagnetic field. The trend of cogging torque and electromagnetic torque are comparesed. The principle of weakening cogging torque is that the http://www.999magnet.com/products/110-sintered-neodymium-magnets electromagnetic torque should been smooth and not been reduced much. First, this thesis makes analysis of impacts on cogging torque by rotor teeth change and the harmonic components of cogging torque. The rule of the periodically viriaty of cogging torque by length of rotor teeth arc change is found. A method of weakening cogging torque by rotor teeth alternation and subsection is proposed. The results of electromagnetic field calculation prove that the method is effective. At last, the impacts of this method on electromagnetic torque is considered and analysed. The result indicates that this method is feasible.
Flux reversal machine (FRM) is a special doubly salient permanent magnet machine. By this time, it is not been comprehensive studied, whether on the structure or the performance. The shortages restrict further development of FRM. Cogging torque ripple is one of the problems that have not been solved. There have been some methods of weaking the cogging torque, and can weaken cogging torque well, but the shortcomings made them unpractical to produce. Neodymium Magnets So this thesis studies the methods of weakening cogging torque of FRM and the impacts on electromagnetic torque. Based on the existing research results and considering the characteristics of FRM, a new effective method is proposed to weaken cogging torque of FRM. It uses rotor teeth alternative and subsective structure. This method makes use of the rule of variety of cogging torque with rotor teeth change, and the cogging torque of two parts of FRM have opposite phase, so the total cogging torque is weakened.Finite element method is used to analyse the electromagnetic field. The trend of cogging torque and electromagnetic torque are comparesed. The principle of weakening cogging torque is that the http://www.999magnet.com/products/110-sintered-neodymium-magnets electromagnetic torque should been smooth and not been reduced much. First, this thesis makes analysis of impacts on cogging torque by rotor teeth change and the harmonic components of cogging torque. The rule of the periodically viriaty of cogging torque by length of rotor teeth arc change is found. A method of weakening cogging torque by rotor teeth alternation and subsection is proposed. The results of electromagnetic field calculation prove that the method is effective. At last, the impacts of this method on electromagnetic torque is considered and analysed. The result indicates that this method is feasible.
2013年1月16日星期三
A Design of Test and Analysis System of Servo Control
A Design of Test and Analysis System of Servo Control
This thesis introduced the design on a servo control system performance analysis and on-line system model identification. With the fast development of modern science, motion control, especially, the high speed high precision servo control is widely used in many fields of high technology. In order to improve the performance of servo control system, it is necessary to Block neodymium magnet acquire the accurate system model and analyze system’s performance. Generally, the analysis of on-line system with the load is harder than off-line. But on-line analysis is helpful for application to set up proper parameter.First, the model of typical speed servo system is set up. The time and frequency domain index of servo control system and their influence on system testing is analyzed, and a method of frequency analysis-Fourier Transform and it’s fast arithmetic-FFT are introduced. Then the theory of correlative identification and how to use it in identifying the pulse response of servo control system is introduced. Finally, a hardware platform is established for data sampling and processing. Based on Ti’s CCS as development environment, C language is used to code the main program. In software the whole test system is separated into three parts, which are the time and frequency domain analysis of servo http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php control system, the harmonic analysis of line voltage and the identification of pulse response of servo control system.In experiment, a high speed and high precision servo control system formed by Huazhong numeric control company’s motor driver HSV-16D-050 and Wuhan Dengqi company’s permanent magnet motor GK-7080-6AC61-FE is chosen as test object. The experiment results show that this test system can perform the desired analysis and test function.
This thesis introduced the design on a servo control system performance analysis and on-line system model identification. With the fast development of modern science, motion control, especially, the high speed high precision servo control is widely used in many fields of high technology. In order to improve the performance of servo control system, it is necessary to Block neodymium magnet acquire the accurate system model and analyze system’s performance. Generally, the analysis of on-line system with the load is harder than off-line. But on-line analysis is helpful for application to set up proper parameter.First, the model of typical speed servo system is set up. The time and frequency domain index of servo control system and their influence on system testing is analyzed, and a method of frequency analysis-Fourier Transform and it’s fast arithmetic-FFT are introduced. Then the theory of correlative identification and how to use it in identifying the pulse response of servo control system is introduced. Finally, a hardware platform is established for data sampling and processing. Based on Ti’s CCS as development environment, C language is used to code the main program. In software the whole test system is separated into three parts, which are the time and frequency domain analysis of servo http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php control system, the harmonic analysis of line voltage and the identification of pulse response of servo control system.In experiment, a high speed and high precision servo control system formed by Huazhong numeric control company’s motor driver HSV-16D-050 and Wuhan Dengqi company’s permanent magnet motor GK-7080-6AC61-FE is chosen as test object. The experiment results show that this test system can perform the desired analysis and test function.
The Research and Application of Feedback System in Frequency Conversion Control System
The Research and Application of Feedback System in Frequency Conversion Control System
As frequency conversion can save energy and has high efficiency , more and more home appliance use this technology . Brushless Direct Current Motor(DCBLM) has extensive applications due to its excellent performances.This paper discusses the sensorless control system for DCBLM using TMP88PH40 MCU,and proposes the hardware circuit and software control project based on it.At the same time,this paper also discusses control system for temperature Ball Neodymium Magnets automation using TMP86C807 MCU.The paper summarizes the developments and applications of the frequency conversion .Then , introduce the applications of the DCBLM .In the chapter about holistic structure analysis for the control system,the paper applies the modular introduce principle, designs the hardware control system based on the core processor TMP88PH40 including power circuit、MCU control circuit、drive circuit and position detection circuit.The paper also analyses the Pulse Amplitude Modulation(PAM)、Pulse Width Modulation(PWM) control methods which are widely used in DC frequency conversion technology. Then it introduce the software control of DCBLM.In the structure of temperature feedback , base on holistic structure for the control system, that design hardware circuit including display , key, memory, communications.In the chapter about system software design, based on the system software of the MCU TMP88PH40, that introduced the fuzzy control http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php method. Then, using temperature feedback software control making the system can automating reach the temperature which ser it before.In the chapter about analysis for experiment results, the paper validates the theory about temperature control system through the waveforms picked from the experiments when the DCBLM control system worked normally. The experiment results indicates the sensorless DCBLM control system satisfies the requirement of stepless speed change. Finally,the paper summarizes the former work and the improvement of the project,prospects the problems and further work we have to deal.
As frequency conversion can save energy and has high efficiency , more and more home appliance use this technology . Brushless Direct Current Motor(DCBLM) has extensive applications due to its excellent performances.This paper discusses the sensorless control system for DCBLM using TMP88PH40 MCU,and proposes the hardware circuit and software control project based on it.At the same time,this paper also discusses control system for temperature Ball Neodymium Magnets automation using TMP86C807 MCU.The paper summarizes the developments and applications of the frequency conversion .Then , introduce the applications of the DCBLM .In the chapter about holistic structure analysis for the control system,the paper applies the modular introduce principle, designs the hardware control system based on the core processor TMP88PH40 including power circuit、MCU control circuit、drive circuit and position detection circuit.The paper also analyses the Pulse Amplitude Modulation(PAM)、Pulse Width Modulation(PWM) control methods which are widely used in DC frequency conversion technology. Then it introduce the software control of DCBLM.In the structure of temperature feedback , base on holistic structure for the control system, that design hardware circuit including display , key, memory, communications.In the chapter about system software design, based on the system software of the MCU TMP88PH40, that introduced the fuzzy control http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php method. Then, using temperature feedback software control making the system can automating reach the temperature which ser it before.In the chapter about analysis for experiment results, the paper validates the theory about temperature control system through the waveforms picked from the experiments when the DCBLM control system worked normally. The experiment results indicates the sensorless DCBLM control system satisfies the requirement of stepless speed change. Finally,the paper summarizes the former work and the improvement of the project,prospects the problems and further work we have to deal.
2013年1月13日星期日
Application of PID Neural-network in the Wind Turbine of the Pitch Control
Application of PID Neural-network in the Wind Turbine of the Pitch Control
This article reviews the design of algorithms for wind turbine pitch control and also for generator torque control in the case of variable speed turbines. Some recent and possible future developments are discussed. Although pitch control is used primarily to limit power in high winds, it also has a significant effect on various loads. Particularly as turbines become larger, there is increasing interest in designing controllers to mitigate loads as far as possible.Blade pitch control is primarily used to limit the aerodynamic power in above-rated wind speeds in order to keep the turbine within its design limits. As the size of wind turbines increases and as cost reduction targets encourage lighter and hence more magnetic materials flexible and dynamic structures, these aspects of controller design become increasingly important. It is important to be able to quantify the benefits of any new controller. Although computer simulations are useful, field trials are also vital. The variability of the real wind means that particular care is needed in the design of the trials.And this article present a new controller on base of the PIDNN algorithms, And analyzing the characteristic of the new controller. A few of the wind models were discussed. Comparing of the wind model, the model which was made in the simulink of the matlab was selected. The gust model also was achieved.Then the model of the indirect-drive permanent magnet and the double-fed induction http://www.999magnet.com generator was implemented in the matlab. Making using of the blockset box, which was designed by the Aalborg university, the model of the pitch angle controller was set up and the result was fine.This article reviews some recent developments in the design of such control algorithms and indicates some of the possibilities which may be realized in the next few years.
This article reviews the design of algorithms for wind turbine pitch control and also for generator torque control in the case of variable speed turbines. Some recent and possible future developments are discussed. Although pitch control is used primarily to limit power in high winds, it also has a significant effect on various loads. Particularly as turbines become larger, there is increasing interest in designing controllers to mitigate loads as far as possible.Blade pitch control is primarily used to limit the aerodynamic power in above-rated wind speeds in order to keep the turbine within its design limits. As the size of wind turbines increases and as cost reduction targets encourage lighter and hence more magnetic materials flexible and dynamic structures, these aspects of controller design become increasingly important. It is important to be able to quantify the benefits of any new controller. Although computer simulations are useful, field trials are also vital. The variability of the real wind means that particular care is needed in the design of the trials.And this article present a new controller on base of the PIDNN algorithms, And analyzing the characteristic of the new controller. A few of the wind models were discussed. Comparing of the wind model, the model which was made in the simulink of the matlab was selected. The gust model also was achieved.Then the model of the indirect-drive permanent magnet and the double-fed induction http://www.999magnet.com generator was implemented in the matlab. Making using of the blockset box, which was designed by the Aalborg university, the model of the pitch angle controller was set up and the result was fine.This article reviews some recent developments in the design of such control algorithms and indicates some of the possibilities which may be realized in the next few years.
Research on Electric Loading System Control Strategy Based on Neural Network
Research on Electric Loading System Control Strategy Based on Neural Network
Electric load simulator is the equipment for rudder loading test, which is realized by motor. And it is used to simulate the load that the aircraft rudder surface suffered during flight in laboratory conditions, so it is important ground simulation equipment for weapon systems. As the loading motor following the position changes of the rudder motor passively, so the influence of surplus torque becomes inevitably which is the mutual problem of passive servo systems. The surplus torque seriously constraints on the loading system performance, making the output torque tracks the load curve imprecisely. Therefore, how to restrain the surplus torque, research and develop high performance loading equipment for rudder motor becomes urgent.As the electric loading system is a typical nonlinear Neodymium Magnets system which is strongly interfered by factors such as coupling, delay and mechanical friction, and the loaded objects are usually uncertain, so it is often imperfect in restraining the surplus torque by using traditional control strategy based on precise mathematical model of the controlled object. As for the complexity of the electric loading system control, neural networks controlling is introduced in the paper. By using the excellent nonlinear function approximation, the output torque will follow the order accurately.Firstly, the whole electric loading system project is designed, using a DC torque motor as the actuator, and the mathematical models of each part are established. On the basis, the relationship between surplus torque and rudder motor’s movement, and the main factors affecting surplus torque are analyzed.
Combining the operating characteristics of electric loading system, an improved structure of the single neuron PID control strategy is proposed. In order to have a better performance on restraining surplus torque, a complex control strategy that combines PID control with the diagonal recurrent neural network control is provided subsequently based on the compensation control idea. Through introducing the rudder position disturbance signal to the compound controller, the feed-forward control is applied using neuron network, which can get good performance without http://www.999magnet.com/products/110-sintered-neodymium-magnets identification of the system model. At the same time, the size of network and the learning speed have been optimized, which leads to high generalization ability and low calculating burden. Simulation results show that the compound control strategy has good performance, no only in the elimination of the surplus torque, but also in the system response rapidness and robustness.The main control interface of the electric loading system is designed based on the VB language, and a motion controller card with digital signal processor inside is used for the main control of the system, then corresponding experimental research is carried out based on the above theory.
Electric load simulator is the equipment for rudder loading test, which is realized by motor. And it is used to simulate the load that the aircraft rudder surface suffered during flight in laboratory conditions, so it is important ground simulation equipment for weapon systems. As the loading motor following the position changes of the rudder motor passively, so the influence of surplus torque becomes inevitably which is the mutual problem of passive servo systems. The surplus torque seriously constraints on the loading system performance, making the output torque tracks the load curve imprecisely. Therefore, how to restrain the surplus torque, research and develop high performance loading equipment for rudder motor becomes urgent.As the electric loading system is a typical nonlinear Neodymium Magnets system which is strongly interfered by factors such as coupling, delay and mechanical friction, and the loaded objects are usually uncertain, so it is often imperfect in restraining the surplus torque by using traditional control strategy based on precise mathematical model of the controlled object. As for the complexity of the electric loading system control, neural networks controlling is introduced in the paper. By using the excellent nonlinear function approximation, the output torque will follow the order accurately.Firstly, the whole electric loading system project is designed, using a DC torque motor as the actuator, and the mathematical models of each part are established. On the basis, the relationship between surplus torque and rudder motor’s movement, and the main factors affecting surplus torque are analyzed.
Combining the operating characteristics of electric loading system, an improved structure of the single neuron PID control strategy is proposed. In order to have a better performance on restraining surplus torque, a complex control strategy that combines PID control with the diagonal recurrent neural network control is provided subsequently based on the compensation control idea. Through introducing the rudder position disturbance signal to the compound controller, the feed-forward control is applied using neuron network, which can get good performance without http://www.999magnet.com/products/110-sintered-neodymium-magnets identification of the system model. At the same time, the size of network and the learning speed have been optimized, which leads to high generalization ability and low calculating burden. Simulation results show that the compound control strategy has good performance, no only in the elimination of the surplus torque, but also in the system response rapidness and robustness.The main control interface of the electric loading system is designed based on the VB language, and a motion controller card with digital signal processor inside is used for the main control of the system, then corresponding experimental research is carried out based on the above theory.
The Development of Underwater Brushless DC Motor Controller Based on Embedded Operating System
The Development of Underwater Brushless DC Motor Controller Based on Embedded Operating System
The topic of this thesis comes from a science and technology item of Liaoning Province: The Research of embedded operation system and the research of Brushless Thruster for Deep-sea Robot. Generally, due to the brushless DC motor is used as the thruster of Deep-sea Robot, the drive system requires high stability, the system’s real-time performance, reliability and to meet the needs of multi-tasking, as well as drive system is required to work in forward and backward mode and realize high precision speed regulating. Based on the above considerations, control technology and control methods of underwater brushless DC motor based embedded operating system were studied.magnetic materials Firstly, recalled the development of the permanent magnet brushless DC motor speed control system and embedded operating system, the basic composition of mathematical models and speed principle is analysed in this paper. According to the special working condition of underwater Robot which requires the reliability, real-time of the drive system, as well as motor own characteristics, the controller design based on embedded operating system is presented.
Controller design concepts and methods adopting the embedded operating systemμC/OS-Ⅱas the underlying software system are discussed in detail, and migrating to control DSP chip, increasing in the reliability of the controller, real-time, enhances portability.Then according as requirements of driven control system for underwater robot, TMS320LF2407A is selected as a control chip drive system. In order to satisfy the requirements of motor controller, the current and speed double closed-loop is used motor control system. According characteristics of underwater brushless DC motor, requirements and the function of DSP chips, the design of used a DSP as core for the control is putted forward, the controller hardware and software design were described in detail in this topic http://www.999magnet.com as well. For the hardware part, after a instruction of the whole design, the design of several chief circuits and practical electronic circuit is presented. For the software part, some procedure flow charts of main program are offered and some problems of software realization, embedded systems transplantation, the main program and interrupt program design process are researched. Finally, the test results and the test results are analyzed when the actual operation of the controller, then conclusion is acquired.
The topic of this thesis comes from a science and technology item of Liaoning Province: The Research of embedded operation system and the research of Brushless Thruster for Deep-sea Robot. Generally, due to the brushless DC motor is used as the thruster of Deep-sea Robot, the drive system requires high stability, the system’s real-time performance, reliability and to meet the needs of multi-tasking, as well as drive system is required to work in forward and backward mode and realize high precision speed regulating. Based on the above considerations, control technology and control methods of underwater brushless DC motor based embedded operating system were studied.magnetic materials Firstly, recalled the development of the permanent magnet brushless DC motor speed control system and embedded operating system, the basic composition of mathematical models and speed principle is analysed in this paper. According to the special working condition of underwater Robot which requires the reliability, real-time of the drive system, as well as motor own characteristics, the controller design based on embedded operating system is presented.
Controller design concepts and methods adopting the embedded operating systemμC/OS-Ⅱas the underlying software system are discussed in detail, and migrating to control DSP chip, increasing in the reliability of the controller, real-time, enhances portability.Then according as requirements of driven control system for underwater robot, TMS320LF2407A is selected as a control chip drive system. In order to satisfy the requirements of motor controller, the current and speed double closed-loop is used motor control system. According characteristics of underwater brushless DC motor, requirements and the function of DSP chips, the design of used a DSP as core for the control is putted forward, the controller hardware and software design were described in detail in this topic http://www.999magnet.com as well. For the hardware part, after a instruction of the whole design, the design of several chief circuits and practical electronic circuit is presented. For the software part, some procedure flow charts of main program are offered and some problems of software realization, embedded systems transplantation, the main program and interrupt program design process are researched. Finally, the test results and the test results are analyzed when the actual operation of the controller, then conclusion is acquired.
2013年1月8日星期二
A Study on Parameter Match and Simulation of Dynamic System for Solar Electric Car
A Study on Parameter Match and Simulation of Dynamic System for Solar Electric Car
The traditional automobile consumes accounts for 30% of the total mining petroleum. Meanwhile the automobile ejects has polluted the environment. Because non- renewable oil resource is drying up, the world automobile profession urgently resolves the question which is developing and taking use of the clean non- pollution resource.In recent years, the world scope inside bring about the wave tide of the development new energy automobile, the university and each big automobile company all round the world vie with each other in developing a hybrid motive automobile, fuel cell automobile, dynamoelectric automobile, solar energy automobile. Our country also is in line with world, launching new energy an automobile of research work. established "863 the motor car item sets" etc..Relatively, comparing to say, energy of solar electric car is most widespread, which comes from to the Neodymium Magnets clean non- pollution sun., no exhaust, simply transmission system, few mechanism, small noise and light weight are the incomparable merits of solar electric car.So this text put forward the solar electric car. to resolve the problem that the automobile profession face, working well the foundation work and theories cushion for the further research of the solar electric car..
The textual research result and main conclusion induce for as follows.1. After referring many research papers, the solar energy electric car classification is generalized, the characteristic which the solar energy electric car has is summarized, technical development situation is elaborated, technology development tendency of solar electric car is forecast..2. The solar electric car. is the most ideal environmental protection type new energy car, each parts is right of choose a type to raise the its motive and economy contain important function. At present the solar cell is divided into: The crystal silicon solar cell, compound thin film solar cell, the polymer multilayer trim electrode solar cell, the nanometer crystallization solar cell. Synthesizing teach performance index of them, because monocrystalline silicon solar cell technology is mature, is used widespreadly, the price is inexpensive, therefore it is suitable for the solar electric car. Accumulator cell types are many and varied, according to com-power, specific energy, energy density, cycle life of sufficient charge and discharge and http://www.999magnet.com/products/110-sintered-neodymium-magnets so on each, the nickel cadmium, the nickel hydrogen and the lithium battery are most suit for the solar electric car. But the price of them is expensive and they need more mature technology. Acid battery although has worse specific energy, com-power, but technology of it is mature, the price is cheap. So acid battery also may be a better choice. Because the wheel hub motor could directly drive the car, so the energy loss is lowest. Another assignment power is nimble, and it may control each wheel independently. So the solar electric car uses the wheel hub motor widely. The wheel hub motor is divided into permanent magnetism direct current brushes motor, the permanent magnetism non-brushes motor, the switch magnetic resistance motor and the asynchronous machine. Considering the velocity modulation characteristic, the price, the output torque characteristics and so on, electromagnetism commutation, the permanent magnetism non-brushes motor is the best choice.3. Under the proposed requirements in the design of solar panels rated power, and according to serial and parallel rules of solar cells, determine the parameters of solar batteries. Vehicle power requirements determine to choose the rated motor speed, maximum speed, rated power, maximum power. Be related to the electrical parameters of the battery capacity and choice of parameters such as the number of pieces Series matches .
According to the electrical engineering of motive request and match parameter calculability the whole car decelerate a ratio.4. The power of the solar electric car. is a very important parameter, this text drew up five kinds of work modes to different need, respectively be: The battery plank drives mode alone, the storage battery drives mode alone, the battery plank storage battery mixture drives mode, the battery plank drives and refreshes mode for storage battery, making kinetic energy recovery mode. The control strategy and the work mode that the bases specify, the difference takes in to elaborate by the form of the sketch and the company. Combine to give with this drive system and make to move the system frame diagram. Settled consociation to drive control strategy frame diagram.5. The text have built up mathematical model of solar panels. Because solar cells work by environmental factors such as light intensity, temperature effects. To improve the accuracy of the model, we built up two kinds http://www.999magnet.com/products/110-sintered-neodymium-magnets of correction models. Then we built battery discharge model, charging model, the SOC is an important parameter in the storage battery work, so it is necessary to make a point analysis to the SOC variety in the model.Finaly,we built up the mathematics model of the electric motor. According to the electrical characteristics of the permanent magnetism non-brushes motor, we explained the speed adjusting method -""the weak magnetism adjusting."6 .According to front establishment of mathematics model, we built up the solar cell set to provide power to simulate model with the MATLAB/SIMULINK and make simulation analysis. Then built up simulation model of the control strategy on joint drive and make simulation analysis, which is to test the curacy of control strategy. Finally, we use simulation software ADVISOR to simulate the model of motor work alone, is to match with the verification parameter of accuracy.
The traditional automobile consumes accounts for 30% of the total mining petroleum. Meanwhile the automobile ejects has polluted the environment. Because non- renewable oil resource is drying up, the world automobile profession urgently resolves the question which is developing and taking use of the clean non- pollution resource.In recent years, the world scope inside bring about the wave tide of the development new energy automobile, the university and each big automobile company all round the world vie with each other in developing a hybrid motive automobile, fuel cell automobile, dynamoelectric automobile, solar energy automobile. Our country also is in line with world, launching new energy an automobile of research work. established "863 the motor car item sets" etc..Relatively, comparing to say, energy of solar electric car is most widespread, which comes from to the Neodymium Magnets clean non- pollution sun., no exhaust, simply transmission system, few mechanism, small noise and light weight are the incomparable merits of solar electric car.So this text put forward the solar electric car. to resolve the problem that the automobile profession face, working well the foundation work and theories cushion for the further research of the solar electric car..
The textual research result and main conclusion induce for as follows.1. After referring many research papers, the solar energy electric car classification is generalized, the characteristic which the solar energy electric car has is summarized, technical development situation is elaborated, technology development tendency of solar electric car is forecast..2. The solar electric car. is the most ideal environmental protection type new energy car, each parts is right of choose a type to raise the its motive and economy contain important function. At present the solar cell is divided into: The crystal silicon solar cell, compound thin film solar cell, the polymer multilayer trim electrode solar cell, the nanometer crystallization solar cell. Synthesizing teach performance index of them, because monocrystalline silicon solar cell technology is mature, is used widespreadly, the price is inexpensive, therefore it is suitable for the solar electric car. Accumulator cell types are many and varied, according to com-power, specific energy, energy density, cycle life of sufficient charge and discharge and http://www.999magnet.com/products/110-sintered-neodymium-magnets so on each, the nickel cadmium, the nickel hydrogen and the lithium battery are most suit for the solar electric car. But the price of them is expensive and they need more mature technology. Acid battery although has worse specific energy, com-power, but technology of it is mature, the price is cheap. So acid battery also may be a better choice. Because the wheel hub motor could directly drive the car, so the energy loss is lowest. Another assignment power is nimble, and it may control each wheel independently. So the solar electric car uses the wheel hub motor widely. The wheel hub motor is divided into permanent magnetism direct current brushes motor, the permanent magnetism non-brushes motor, the switch magnetic resistance motor and the asynchronous machine. Considering the velocity modulation characteristic, the price, the output torque characteristics and so on, electromagnetism commutation, the permanent magnetism non-brushes motor is the best choice.3. Under the proposed requirements in the design of solar panels rated power, and according to serial and parallel rules of solar cells, determine the parameters of solar batteries. Vehicle power requirements determine to choose the rated motor speed, maximum speed, rated power, maximum power. Be related to the electrical parameters of the battery capacity and choice of parameters such as the number of pieces Series matches .
According to the electrical engineering of motive request and match parameter calculability the whole car decelerate a ratio.4. The power of the solar electric car. is a very important parameter, this text drew up five kinds of work modes to different need, respectively be: The battery plank drives mode alone, the storage battery drives mode alone, the battery plank storage battery mixture drives mode, the battery plank drives and refreshes mode for storage battery, making kinetic energy recovery mode. The control strategy and the work mode that the bases specify, the difference takes in to elaborate by the form of the sketch and the company. Combine to give with this drive system and make to move the system frame diagram. Settled consociation to drive control strategy frame diagram.5. The text have built up mathematical model of solar panels. Because solar cells work by environmental factors such as light intensity, temperature effects. To improve the accuracy of the model, we built up two kinds http://www.999magnet.com/products/110-sintered-neodymium-magnets of correction models. Then we built battery discharge model, charging model, the SOC is an important parameter in the storage battery work, so it is necessary to make a point analysis to the SOC variety in the model.Finaly,we built up the mathematics model of the electric motor. According to the electrical characteristics of the permanent magnetism non-brushes motor, we explained the speed adjusting method -""the weak magnetism adjusting."6 .According to front establishment of mathematics model, we built up the solar cell set to provide power to simulate model with the MATLAB/SIMULINK and make simulation analysis. Then built up simulation model of the control strategy on joint drive and make simulation analysis, which is to test the curacy of control strategy. Finally, we use simulation software ADVISOR to simulate the model of motor work alone, is to match with the verification parameter of accuracy.
Research on the Four-Quadrant Transducer Used for Hybrid Electric Vehicle
Research on the Four-Quadrant Transducer Used for Hybrid Electric Vehicle
The four-quadrant transducer drive system is a novel drive system used for hybrid electric vehicle (HEV), and it becomes one of the most competitive and ideal drive systems due to its compact structure and advantages of series-parallel hybrid. Some research has been carried out on the four-quadrant transducer (4QT) which is the key part in the four-quadrant transducer drive system.Firstly, the magnetic-circuit model of the radial-radial flux 4QT is established, and magnetic field and the electromagnetic torque are analyzed. The problem about the magnetic coupling neodymium standard state between the stator machine (SM) and double rotor machine (DRM) is discussed, which draws the conclusion that little magnetic coupling exists between the SM and the DRM.Then, the inductances of the 4QT prototype are calculated with a phasor-diagram based 2D finite-element method (FEM). In order to consider the effect of cross magnetization on the d- and q-axis inductances, the traditional two-axis machine model is modified by including the cross-coupling inductances. Meanwhile, the eddy-current effect on the inductances is discussed. The calculated inductances and the experimental ones are in good agreement, which proves the correctness of the calculating method.The thermal analysis is implemented based on the 2D FEM simulation model, and the temperature fields of the 4QT prototype with different loads are obtained. The simulation is validated by the comparisons with the experiment.Lastly, the research on the cooling system of the 4QT prototype is performed. The cooling effects of the forced air http://www.999magnet.com/products/112-neodymium-standard-state and water cooling on the different parts of the 4QT prototype are discussed, and the new cooling system is designed based on the presented principle for modifying the original one. The two cooling systems are compared and the cooling-effectiveness improvement of the new cooling system is validated by the results. On the other hand, the influences of the cooling-fluid parameters on the cooling effectiveness are discussed based on the simulation, which provides a reference for choosing the parameters of the cooling fluid properly.
The four-quadrant transducer drive system is a novel drive system used for hybrid electric vehicle (HEV), and it becomes one of the most competitive and ideal drive systems due to its compact structure and advantages of series-parallel hybrid. Some research has been carried out on the four-quadrant transducer (4QT) which is the key part in the four-quadrant transducer drive system.Firstly, the magnetic-circuit model of the radial-radial flux 4QT is established, and magnetic field and the electromagnetic torque are analyzed. The problem about the magnetic coupling neodymium standard state between the stator machine (SM) and double rotor machine (DRM) is discussed, which draws the conclusion that little magnetic coupling exists between the SM and the DRM.Then, the inductances of the 4QT prototype are calculated with a phasor-diagram based 2D finite-element method (FEM). In order to consider the effect of cross magnetization on the d- and q-axis inductances, the traditional two-axis machine model is modified by including the cross-coupling inductances. Meanwhile, the eddy-current effect on the inductances is discussed. The calculated inductances and the experimental ones are in good agreement, which proves the correctness of the calculating method.The thermal analysis is implemented based on the 2D FEM simulation model, and the temperature fields of the 4QT prototype with different loads are obtained. The simulation is validated by the comparisons with the experiment.Lastly, the research on the cooling system of the 4QT prototype is performed. The cooling effects of the forced air http://www.999magnet.com/products/112-neodymium-standard-state and water cooling on the different parts of the 4QT prototype are discussed, and the new cooling system is designed based on the presented principle for modifying the original one. The two cooling systems are compared and the cooling-effectiveness improvement of the new cooling system is validated by the results. On the other hand, the influences of the cooling-fluid parameters on the cooling effectiveness are discussed based on the simulation, which provides a reference for choosing the parameters of the cooling fluid properly.
DSP Implementation of Control System for Brushless DC Motor
DSP Implementation of Control System for Brushless DC Motor
In the last 20 years, Brushless DC Motor had made a rapid development with the development of new Permanent Magnetic materials, Microelectronics, Automatic Control technology and electronics, especially the development of High Power Switching Device. BLDC is simple in structure, reliable in operation and easy to control when it remains the good dynamic and static governing characteristics of the traditional DC Motors. BLDC has made a outstanding development in many new fields including Aerospace, medical treatment, information, household appliances and industrial automation in additions to the traditional applications of munitions industry.DSP is a Alnico Magnets programmable SCM which is designed to deal with digital signal. It is also a combines of modern electronic, computer technology and the signal processing technology. Due to its unique structure of bus and special digital signal processing instructions, it has infiltrated into various application areas.First, the development, architecture, working principle and the control methods are analyzed, and then schemes of the control system based on system requirements is given in the thesis, in which TMS320F2812 is taken as controlling core. Some main control methods of BLDC are contrasted, and modular switching control method was selected, at last, the experiment result demonstrates the system schemes.Hardware http://www.999magnet.com/products/108-alnico-magnets design of BLDC motor control system including the basic expand of TMS320F2812, drive circuit, current-detecting circuit and the EMC circuit are briefly introduced in this paper. In addition, it uses Double-closed-loop PI Control method, and realized the Double-closed-loop PI Control method on the hardware platform.The whole system has good and stable operating characters in the experiment, it reaches anticipated aim of design.
In the last 20 years, Brushless DC Motor had made a rapid development with the development of new Permanent Magnetic materials, Microelectronics, Automatic Control technology and electronics, especially the development of High Power Switching Device. BLDC is simple in structure, reliable in operation and easy to control when it remains the good dynamic and static governing characteristics of the traditional DC Motors. BLDC has made a outstanding development in many new fields including Aerospace, medical treatment, information, household appliances and industrial automation in additions to the traditional applications of munitions industry.DSP is a Alnico Magnets programmable SCM which is designed to deal with digital signal. It is also a combines of modern electronic, computer technology and the signal processing technology. Due to its unique structure of bus and special digital signal processing instructions, it has infiltrated into various application areas.First, the development, architecture, working principle and the control methods are analyzed, and then schemes of the control system based on system requirements is given in the thesis, in which TMS320F2812 is taken as controlling core. Some main control methods of BLDC are contrasted, and modular switching control method was selected, at last, the experiment result demonstrates the system schemes.Hardware http://www.999magnet.com/products/108-alnico-magnets design of BLDC motor control system including the basic expand of TMS320F2812, drive circuit, current-detecting circuit and the EMC circuit are briefly introduced in this paper. In addition, it uses Double-closed-loop PI Control method, and realized the Double-closed-loop PI Control method on the hardware platform.The whole system has good and stable operating characters in the experiment, it reaches anticipated aim of design.
Research into the Technology of Magnetic Fluid Seal at Stern Shaft
Research into the Technology of Magnetic Fluid Seal at Stern Shaft
The stern shaft seal is a special kind of seal due to the preventing both the leakage of lubricating oil out of the ship and the entrance of seawater into the stern shaft system. Not only leakage and pollution are the consequences of improper sealing design, but the operating safety of robots will be affected as well. Magnetic fluid seal has the characteristics of long life, zero leakage, simple structure, fitting high-speed rotation, etc, making it an effective new technology of sealing at the stern shaft of ships.The paper begins with the preparation process and method of Neodymium Magnets magnetic fluid. The magnetic particle, base fluid and surface activating agent are rationally chosen. The water base, oil base and ester based Fe3O4 magnetic fluid are prepared by chemical method and their hydrophobic and oleophobic performances are investigated. The effects of preparation technique on the magnetization characteristics, viscosity characteristics and suspension stability of the prepared Fe3O4 magnetic fluid are also discussed.
Then, the research target in the experiment of this paper—oil based Fe3O4 magnetic fluid, is confirmed through analysis and compare.Based on the research objective of the experiment of magnetic fluid seal at stern shaft, the overall plan of the experimental devices is put up with and the experimental facility is designed. The material choices and main parameter design and calculation of each component are carried out, ensuring the improvement of the pressure differences of magnetic fluid, under the precondition of the same magnetic fluid characteristics and the same volume of permanent magnet.From the point of view of magnetic circuit, the characteristics of the magnetic http://www.999magnet.com/products/110-sintered-neodymium-magnets fluid of the stern shaft sealing device are analyzed and the model of magnetic fluid seal is built. According to the magnetism of particles, and combining the possible concentration distribution model of magnetic particles in the magnetic field, the pressure-bearing formula of the corresponding magnetic fluid seal is deduced.Furthermore, the pressure-bearing power of the Fe3O4 magnetic fluid is studied and the main factors that could affect the pressure-bearing power of magnetic fluid sealing devices are analyzed. Results show that the pressure-bearing power has a negative relationship with the sealing clearance and the rotating speed of the rotation shaft, but has a positive relationship with the intensity of saturated magnetization of the magnetic fluid.The research findings in the paper have provided the theoretical basis and credible experimental data for the application of magnetic fluid seal technology at stern shaft of ships. Simultaneously, these results have laid a foundation for the subsequent researches.
The stern shaft seal is a special kind of seal due to the preventing both the leakage of lubricating oil out of the ship and the entrance of seawater into the stern shaft system. Not only leakage and pollution are the consequences of improper sealing design, but the operating safety of robots will be affected as well. Magnetic fluid seal has the characteristics of long life, zero leakage, simple structure, fitting high-speed rotation, etc, making it an effective new technology of sealing at the stern shaft of ships.The paper begins with the preparation process and method of Neodymium Magnets magnetic fluid. The magnetic particle, base fluid and surface activating agent are rationally chosen. The water base, oil base and ester based Fe3O4 magnetic fluid are prepared by chemical method and their hydrophobic and oleophobic performances are investigated. The effects of preparation technique on the magnetization characteristics, viscosity characteristics and suspension stability of the prepared Fe3O4 magnetic fluid are also discussed.
Then, the research target in the experiment of this paper—oil based Fe3O4 magnetic fluid, is confirmed through analysis and compare.Based on the research objective of the experiment of magnetic fluid seal at stern shaft, the overall plan of the experimental devices is put up with and the experimental facility is designed. The material choices and main parameter design and calculation of each component are carried out, ensuring the improvement of the pressure differences of magnetic fluid, under the precondition of the same magnetic fluid characteristics and the same volume of permanent magnet.From the point of view of magnetic circuit, the characteristics of the magnetic http://www.999magnet.com/products/110-sintered-neodymium-magnets fluid of the stern shaft sealing device are analyzed and the model of magnetic fluid seal is built. According to the magnetism of particles, and combining the possible concentration distribution model of magnetic particles in the magnetic field, the pressure-bearing formula of the corresponding magnetic fluid seal is deduced.Furthermore, the pressure-bearing power of the Fe3O4 magnetic fluid is studied and the main factors that could affect the pressure-bearing power of magnetic fluid sealing devices are analyzed. Results show that the pressure-bearing power has a negative relationship with the sealing clearance and the rotating speed of the rotation shaft, but has a positive relationship with the intensity of saturated magnetization of the magnetic fluid.The research findings in the paper have provided the theoretical basis and credible experimental data for the application of magnetic fluid seal technology at stern shaft of ships. Simultaneously, these results have laid a foundation for the subsequent researches.
The Research of Control System for Brushless DC Motor Based on DSP
The Research of Control System for Brushless DC Motor Based on DSP
Brushless DC motor is a kind of new product developing rapidly recently. After the position sensorless control technology has been adopted , Brushless DC motor control system avoids the disadvantages produced by rotor position sensor, the cost of motor is reduced, system reliability and adaptability of the environment are also enhanced. Meanwhile the Brushless DC motor control system has been widely applied in many fields.In this dissertation, permanent magnet brushless DC motor is subject investigated ,the system structure and control laws(rule) are studied, the neodymium standard state quare wave brushless DC motor simulation mode basing on the non-linear inductance is also established. At the same time Brushless DC motor Without position sensor control system startup, in-depth phase are studied. The self-tuning fuzzy - PID controller is established, and it is applied in brushless DC motor without position sensors control system, receiving better control effect.On the basis of brushless DC motor control system theory simulation, the control programme baseing on DSP technology with and without position sensor is proposed. hardware circuit such as the main circuit, power driver circuit, voltage and current circuit, serial communication circuit, logic control and protection circuit are designed, combining with the characteristics of TI’s DSP control chips TMS320F2812 as well as making a three-phase Brushless DC motor as the astrocytes control object. According to the system programme the DSP http://www.999magnet.com/products/112-neodymium-standard-state software control system is designed, the software flow chart and databook are compiled . The computer monitoring system of the control system is designed in Visual Basic 6.0 development environment. Finally, the control system is debugged and the close loop system runs smoothly and the brushless DC motor control system of positive rotation negative rotation and speed given are realized. Also the problems encountered in the process of debugging as well as solutions are analyzed and explained.
Brushless DC motor is a kind of new product developing rapidly recently. After the position sensorless control technology has been adopted , Brushless DC motor control system avoids the disadvantages produced by rotor position sensor, the cost of motor is reduced, system reliability and adaptability of the environment are also enhanced. Meanwhile the Brushless DC motor control system has been widely applied in many fields.In this dissertation, permanent magnet brushless DC motor is subject investigated ,the system structure and control laws(rule) are studied, the neodymium standard state quare wave brushless DC motor simulation mode basing on the non-linear inductance is also established. At the same time Brushless DC motor Without position sensor control system startup, in-depth phase are studied. The self-tuning fuzzy - PID controller is established, and it is applied in brushless DC motor without position sensors control system, receiving better control effect.On the basis of brushless DC motor control system theory simulation, the control programme baseing on DSP technology with and without position sensor is proposed. hardware circuit such as the main circuit, power driver circuit, voltage and current circuit, serial communication circuit, logic control and protection circuit are designed, combining with the characteristics of TI’s DSP control chips TMS320F2812 as well as making a three-phase Brushless DC motor as the astrocytes control object. According to the system programme the DSP http://www.999magnet.com/products/112-neodymium-standard-state software control system is designed, the software flow chart and databook are compiled . The computer monitoring system of the control system is designed in Visual Basic 6.0 development environment. Finally, the control system is debugged and the close loop system runs smoothly and the brushless DC motor control system of positive rotation negative rotation and speed given are realized. Also the problems encountered in the process of debugging as well as solutions are analyzed and explained.
Control System Design of Electrial Fuel Pump
Control System Design of Electrial Fuel Pump
From 1970s, small military aviation and aviation platforms under several hundreds gram are first developed in the developed countries. So far, several decades elapse. Turbojet engines have some advantages, such as, accelerating fast, designing simply, which is most suitable for the earliest practical use of the jet engine types. In the development trend of modern military aircraft and missile is going to be unmanned, small and micro, micro - turbojet engine is being taken more and more importance.Turbojet engine control system has traditionally been Alnico Magnets realized by the mechanical and hydraulic-mechanical pneumatic regulator, its fuel control system is achieved by a mechanical device attached to the engine. However, according to the structural and applying characteristics of the small or micro-turbojet engine, its oil supply scheme can not be realized by the traditional annex pumps of the engine.According to the control request of some type miniature turbojet engine, its oil supply control system was designed in this paper.
We first analyzed the oil supply control methods of turbojet engine and the present development situation and tendency of the electrical fuel pump using in the miniature engine oil supply system. Referring overseas similar engine oil supply control methods, we designed electrically operated oil supply system by using brush permanent magnet direct-current servo motor meshing the gear pump.Analyzing the electrical fuel pump working mechanism, we chose bipolar H bridge type PWM converter as the driving scheme of the DC servo motor in the electrical fuel pump, and used the entire closed-loop control system, which was formed by the voltage negative feedback electric current compensate control system replacing the traditional speed negative feedback, as the control scheme of the motor. Then we established the voltage negative feedback electric current compensate control system mathematical model based on the mathematical models of the DC servo motor, the bipolar H bridge http://www.999magnet.com/products/108-alnico-magnets PWM converter and the voltage negative feedback electric current compensate control element, and designed the controller of electrical fuel pump control system by using the PID control method, and simulating the control system in the Simulink environment of MATLAB software.Based on the designed system, bipolar H bridge type PWM (pulse width modulation) motor-driven control hardware system was designed, which was used 83C552 MCU produced by PHILIPS Corporation as its master control chip. Meanwhile the principle and circuit designs of each constituent of the system (such as controller, driving circuit, and feedback circuit) were introduced in the paper in detail.Finally we made the principle test on the sample circuit board, the result showed that the control system of the electrical fuel pump oil supply system, which was designed by us, could meet the oil feed needs of the engine.
From 1970s, small military aviation and aviation platforms under several hundreds gram are first developed in the developed countries. So far, several decades elapse. Turbojet engines have some advantages, such as, accelerating fast, designing simply, which is most suitable for the earliest practical use of the jet engine types. In the development trend of modern military aircraft and missile is going to be unmanned, small and micro, micro - turbojet engine is being taken more and more importance.Turbojet engine control system has traditionally been Alnico Magnets realized by the mechanical and hydraulic-mechanical pneumatic regulator, its fuel control system is achieved by a mechanical device attached to the engine. However, according to the structural and applying characteristics of the small or micro-turbojet engine, its oil supply scheme can not be realized by the traditional annex pumps of the engine.According to the control request of some type miniature turbojet engine, its oil supply control system was designed in this paper.
We first analyzed the oil supply control methods of turbojet engine and the present development situation and tendency of the electrical fuel pump using in the miniature engine oil supply system. Referring overseas similar engine oil supply control methods, we designed electrically operated oil supply system by using brush permanent magnet direct-current servo motor meshing the gear pump.Analyzing the electrical fuel pump working mechanism, we chose bipolar H bridge type PWM converter as the driving scheme of the DC servo motor in the electrical fuel pump, and used the entire closed-loop control system, which was formed by the voltage negative feedback electric current compensate control system replacing the traditional speed negative feedback, as the control scheme of the motor. Then we established the voltage negative feedback electric current compensate control system mathematical model based on the mathematical models of the DC servo motor, the bipolar H bridge http://www.999magnet.com/products/108-alnico-magnets PWM converter and the voltage negative feedback electric current compensate control element, and designed the controller of electrical fuel pump control system by using the PID control method, and simulating the control system in the Simulink environment of MATLAB software.Based on the designed system, bipolar H bridge type PWM (pulse width modulation) motor-driven control hardware system was designed, which was used 83C552 MCU produced by PHILIPS Corporation as its master control chip. Meanwhile the principle and circuit designs of each constituent of the system (such as controller, driving circuit, and feedback circuit) were introduced in the paper in detail.Finally we made the principle test on the sample circuit board, the result showed that the control system of the electrical fuel pump oil supply system, which was designed by us, could meet the oil feed needs of the engine.
2013年1月4日星期五
Research on Principal Axis Control System of Variable Vector Propeller of Submarine
Research on Principal Axis Control System of Variable Vector Propeller of Submarine
Submarine is a kind of important facilities in ocean exploitation and research. With the development of submarine it requires lighter, smaller fittings, and meanwhile must satisfy the maneuverability demand. The Variable Propeller is a kind of specific propeller that is capable of continuously generating any degree of thrust in any three dimensional direction by varying blades’ pitches cyclically in the process of rotation. By using Variable Vector Propeller, it is able to reduce propellers and consequently to contribute to the compactness and the light weight of ROV, etc. Variable Vector Propeller can be broadly applied in Submarine.Compared with traditional propeller, neodymium standard state Variable Vector Propeller has more complicated operational principle. The model and controller design of Variable Vector Propeller is very different from that of traditional propeller. This paper is aiming at principal axis control system on Variable Vector Propeller of Submarine. It analyses element and performance of Variable Vector Propeller. This paper is estimated to the load of propeller and turn moment of motor. To meet the demand of control system, the vector control technique is chosen as the control strategy of permanent magnet synchronous system. The torque control of motor is actually current control of d and q axe. It suggests that the rotor field-orientation vector control of id=0 can be chosen, in view of the surface mounted PMSM used in the item. The electric current loop and speed loop of the system were designed with the help of engineering design method of automation system regulator. http://www.999magnet.com/products/112-neodymium-standard-state Aim at the nonlinearity and slow time varying and changing disturber and such characteristic, we choose the Fuzzy Adaptive PI Controller in this paper. And we study the simulation of fuzzy adaptive PI control system, the result prove that the fuzzy adaptive PI controller can achieve batter control effect than regulatory PI controller, and can advance the system power of anti-jamming and speediness of system response.
Submarine is a kind of important facilities in ocean exploitation and research. With the development of submarine it requires lighter, smaller fittings, and meanwhile must satisfy the maneuverability demand. The Variable Propeller is a kind of specific propeller that is capable of continuously generating any degree of thrust in any three dimensional direction by varying blades’ pitches cyclically in the process of rotation. By using Variable Vector Propeller, it is able to reduce propellers and consequently to contribute to the compactness and the light weight of ROV, etc. Variable Vector Propeller can be broadly applied in Submarine.Compared with traditional propeller, neodymium standard state Variable Vector Propeller has more complicated operational principle. The model and controller design of Variable Vector Propeller is very different from that of traditional propeller. This paper is aiming at principal axis control system on Variable Vector Propeller of Submarine. It analyses element and performance of Variable Vector Propeller. This paper is estimated to the load of propeller and turn moment of motor. To meet the demand of control system, the vector control technique is chosen as the control strategy of permanent magnet synchronous system. The torque control of motor is actually current control of d and q axe. It suggests that the rotor field-orientation vector control of id=0 can be chosen, in view of the surface mounted PMSM used in the item. The electric current loop and speed loop of the system were designed with the help of engineering design method of automation system regulator. http://www.999magnet.com/products/112-neodymium-standard-state Aim at the nonlinearity and slow time varying and changing disturber and such characteristic, we choose the Fuzzy Adaptive PI Controller in this paper. And we study the simulation of fuzzy adaptive PI control system, the result prove that the fuzzy adaptive PI controller can achieve batter control effect than regulatory PI controller, and can advance the system power of anti-jamming and speediness of system response.
Preparation and Seal Application of Nano-magnetic Fluid
Preparation and Seal Application of Nano-magnetic Fluid
Magnetic fluid is a new nanometer functional material. But the technology is complicated, technological process is long, and mission success rate is not high at the present time. The thesis prepare nano-magnetic liquid by plasma activation methods, we explore reactant ratio、 former and later operating temperature、 condition of physical spread、 times of reaction cycle、 pulse frequency、 pulsed voltage parameter, finally, the optimum reaction conditions to prepare magnetic fluid with high magnetic saturation are discovered. It is also determined through Alnico Magnets experimental researches that the highest pulse frequency should be controlled at 64kHz, the highest pulse voltage 9 kV, the former temperature should be controlled around 90°C～100 °C,the later temperature should be controlled around 180°C～200°C, and the reaction time around two hours.We applied magnetic fluid of home-made to magnetic fluid static seal. On the safety valve experimental platform of self-designed, the key parameters of magnetic fluid seal are studied through experiments related. Research shows: opening pressure become increasing as the intensity of magnetic field strengthen. We put magnetic pole piece into safety valve , to effect seal ability of magnetic fluid safety valve through transfer magnetic http://www.999magnet.com/products/108-alnico-magnets circuit flux of permanent magnetism loop’s N、S pole, opening pressure become increasing as the thickness of magnetic pole piece increase. We use shift able hoop of varied thick to change magnetic pole piece, even if in the state of magnetic field invariant, still to change opening pressure by control magnetic flux path.
Magnetic fluid is a new nanometer functional material. But the technology is complicated, technological process is long, and mission success rate is not high at the present time. The thesis prepare nano-magnetic liquid by plasma activation methods, we explore reactant ratio、 former and later operating temperature、 condition of physical spread、 times of reaction cycle、 pulse frequency、 pulsed voltage parameter, finally, the optimum reaction conditions to prepare magnetic fluid with high magnetic saturation are discovered. It is also determined through Alnico Magnets experimental researches that the highest pulse frequency should be controlled at 64kHz, the highest pulse voltage 9 kV, the former temperature should be controlled around 90°C～100 °C,the later temperature should be controlled around 180°C～200°C, and the reaction time around two hours.We applied magnetic fluid of home-made to magnetic fluid static seal. On the safety valve experimental platform of self-designed, the key parameters of magnetic fluid seal are studied through experiments related. Research shows: opening pressure become increasing as the intensity of magnetic field strengthen. We put magnetic pole piece into safety valve , to effect seal ability of magnetic fluid safety valve through transfer magnetic http://www.999magnet.com/products/108-alnico-magnets circuit flux of permanent magnetism loop’s N、S pole, opening pressure become increasing as the thickness of magnetic pole piece increase. We use shift able hoop of varied thick to change magnetic pole piece, even if in the state of magnetic field invariant, still to change opening pressure by control magnetic flux path.
全数字交流伺服系统在工业缝纫机上的应用研究
全数字交流伺服系统在工业缝纫机上的应用研究
With the domain upgrade of rag trade, more and more traditional Industrial Lockstitch Sewing Machines (ILSM) are being replaced by the ones with computers which are good at efficiency, energy conservation and environment protection and win the favor of consumers.The servo system of ILSM with computer designed in the paper emplores TMS320LF2407A DSP of TI Corporation as the main controller which implements the servo control of Permanent-Magnet Synchronous Motor (PMSM). Field Oriented Control with I_d = 0 is applied whose torque ripples are small, and wide speed could be gained. A complex photoelectric encoder with low cost is used as Neodymium Magnets the position and detection of rotor. The endoer makes the start of PMSM easy. The samples of phase currents emplore two hall sensors which have the high precision. The current control loop and the speed loop use the anti-integration saturation PI contorller to improve the interface immunity and obtain good tracking perfomance.The system provides fast response and sufficient precision control of speed and position, and its speed is steady. It enables automatic functions such as needle positioning, automatic trimmer and wiper, backtacking, constant-stitch sewing. Besides, the system has the self-checking function and the PID controller whose parameters could be adjusted easily which improve the system’s applicability.
To different PMSMs, good effect of control could be gained by simple adjustment of PID controller. Self-checking of system can be used to detect the main performances of the system, such as accelerating and decelerating time, precision of position control. http://www.999magnet.com/products/110-sintered-neodymium-magnets An operation panel is designed to set the sewing parameters which are then downloaded into the DSP through the Series Communication Interface (SCI).The circuit of power driver is composed of IR21365 and IRFP460 whose safeguard ensure the safety of system. Hardware design is precise and flexible and circuits have strong ability of noise resistance.The techniques of Oriented Object Programming (OOP) and Combined Programming are emplored for the sofeware design of system to enrure the system’s real-time characteristic. It provides opportunity for advancements of the C language and the assembly language.Results of the system tests show that the control system has good performance and has bright market prospect.
With the domain upgrade of rag trade, more and more traditional Industrial Lockstitch Sewing Machines (ILSM) are being replaced by the ones with computers which are good at efficiency, energy conservation and environment protection and win the favor of consumers.The servo system of ILSM with computer designed in the paper emplores TMS320LF2407A DSP of TI Corporation as the main controller which implements the servo control of Permanent-Magnet Synchronous Motor (PMSM). Field Oriented Control with I_d = 0 is applied whose torque ripples are small, and wide speed could be gained. A complex photoelectric encoder with low cost is used as Neodymium Magnets the position and detection of rotor. The endoer makes the start of PMSM easy. The samples of phase currents emplore two hall sensors which have the high precision. The current control loop and the speed loop use the anti-integration saturation PI contorller to improve the interface immunity and obtain good tracking perfomance.The system provides fast response and sufficient precision control of speed and position, and its speed is steady. It enables automatic functions such as needle positioning, automatic trimmer and wiper, backtacking, constant-stitch sewing. Besides, the system has the self-checking function and the PID controller whose parameters could be adjusted easily which improve the system’s applicability.
To different PMSMs, good effect of control could be gained by simple adjustment of PID controller. Self-checking of system can be used to detect the main performances of the system, such as accelerating and decelerating time, precision of position control. http://www.999magnet.com/products/110-sintered-neodymium-magnets An operation panel is designed to set the sewing parameters which are then downloaded into the DSP through the Series Communication Interface (SCI).The circuit of power driver is composed of IR21365 and IRFP460 whose safeguard ensure the safety of system. Hardware design is precise and flexible and circuits have strong ability of noise resistance.The techniques of Oriented Object Programming (OOP) and Combined Programming are emplored for the sofeware design of system to enrure the system’s real-time characteristic. It provides opportunity for advancements of the C language and the assembly language.Results of the system tests show that the control system has good performance and has bright market prospect.
The Design of Universal Developing Platform for Motor Control
The Design of Universal Developing Platform for Motor Control
With the increasing demands for the motor control technology, common MCU can’t satisfy the control demands. However, the development of DSP technology can strongly support the implementation of advanced control theory and complex control algorithm. But in the development of motor control based on DSP, there are such many deficiencies as low efficiency and more needs for professional knowledge.Therefore, based on TMS320F2812 DSP and the toolbox Embedded Target for TI C2000 DSP in Matlab7.0, a design scheme of universal developing platform for motor control is proposed, which can greatly improve the developing efficiency neodymium prices of the motor control. The platform is designed with TMS320F2812 as its core and realizes PWM signal trigger with EPM7128. The three-phase full-bridge circuit is constructed with IR2130. Moreover, by introducing the design method of DSP software based on the platform, a simple example for the application of the PWM module is given and the feasibility of the design scheme for platform software is verified.Considering the demands of the performance index for high precision speed source, by analyzing the principle, mathematical model and vector graphic of rare earth permanent magnetic synchronous motor (PMSM), the strategy of closed-loop control of power angle in VVVF of PMSM is proposed. In the system, the power angle is detected by HALL position sensor and the power angle closed-loop controller is designed with the method of PID fuzzy self-tuning.
Thus the system not only has a more rapid response speed, but also has smaller over-regulating and better static properties. In addition, the key http://www.999magnet.com/products/142-neodymium-prices technology included in the system is discussed in detail.The experiment shows that the high precision speed source has good speed precision and the demands of the performance index are reached. Under the power angle closed-loop control, the resistance capacity against load disturbance is improved and the problem of out-of-step is efficiently solved. In the steadily running mode, the operating current is remarkably decreased and the operating efficiency is increased. Moreover, the high precision speed source is successfully debugged in the platform, which verifies the correctness and the reliability of the platform.The platform which has both functions of teaching and product developing,
With the increasing demands for the motor control technology, common MCU can’t satisfy the control demands. However, the development of DSP technology can strongly support the implementation of advanced control theory and complex control algorithm. But in the development of motor control based on DSP, there are such many deficiencies as low efficiency and more needs for professional knowledge.Therefore, based on TMS320F2812 DSP and the toolbox Embedded Target for TI C2000 DSP in Matlab7.0, a design scheme of universal developing platform for motor control is proposed, which can greatly improve the developing efficiency neodymium prices of the motor control. The platform is designed with TMS320F2812 as its core and realizes PWM signal trigger with EPM7128. The three-phase full-bridge circuit is constructed with IR2130. Moreover, by introducing the design method of DSP software based on the platform, a simple example for the application of the PWM module is given and the feasibility of the design scheme for platform software is verified.Considering the demands of the performance index for high precision speed source, by analyzing the principle, mathematical model and vector graphic of rare earth permanent magnetic synchronous motor (PMSM), the strategy of closed-loop control of power angle in VVVF of PMSM is proposed. In the system, the power angle is detected by HALL position sensor and the power angle closed-loop controller is designed with the method of PID fuzzy self-tuning.
Thus the system not only has a more rapid response speed, but also has smaller over-regulating and better static properties. In addition, the key http://www.999magnet.com/products/142-neodymium-prices technology included in the system is discussed in detail.The experiment shows that the high precision speed source has good speed precision and the demands of the performance index are reached. Under the power angle closed-loop control, the resistance capacity against load disturbance is improved and the problem of out-of-step is efficiently solved. In the steadily running mode, the operating current is remarkably decreased and the operating efficiency is increased. Moreover, the high precision speed source is successfully debugged in the platform, which verifies the correctness and the reliability of the platform.The platform which has both functions of teaching and product developing,
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