无刷直流鱼雷推进电机控制器设计

无刷直流鱼雷推进电机控制器设计

 The thesis discusses the state-of-the-art of BLDCM and the pending further study of the main issue. The thesis discusses the key-technology about a control system project which applied to a large power capacity rare earth permanent magnet brushless DC motor (BLDCM), neodymium prices

http://www.999magnet.com/products/142-neodymium-prices designs the hardware and software of the BLDCM control system.The thesis analyzes the causes of the torque ripple BLDCM and the commutation current. Building the BLDCM model under the conditions of the magnetic circuit which is not saturated, eddy current and hysteresis loss which is not consider, the three-phase windings of the brushless DC motor which is completely symmetrical. Compare with the torque in non-commutation interval, analyzing the torque formula in different current slopes. Derivation different torque ripple in different current slopes. Combining the formula was derived and references, then bringing up the method which is based on the hysteresis current law to restrain torque ripple. Next, the method of regulating the speed of BLDCM is studied detailedly. On the basis of fuzzy control, Fuzzy controller regulate the speed with hysteresis current regulator bicyclic current regulation governing system PID controller and with the use of speed adjustment current hysteresis current regulator with the adjustment bicyclic systems in MATLAB simulation speed, proved its superiority in less torque ripple and less speed change; On the basis of the above, TMS320LF2407A control subsystem based on the complete hardware design: The clock module, memory modules, etc. According to the hardware design, the main program flow, speed adjustment, the current regulation, and commutation logic are completely designed by DSP. 更多还原

Study on Back-EMF Method and Starting Technique of BLDCM

Study on Back-EMF Method and Starting Technique of BLDCM

 Brushless DC motor(BLDCM) is a kind of electromechanical integration machinery, and it has been rapidly developing in recent years with the help of the Neodymium Magnets

http://www.999magnet.com/products/110-sintered-neodymium-magnets development of power electronic technique and the appearance of new type of permanent magnet material. With it’s widely used in many fields, sensorless control especially back-EMF method is more useful than sensor control in many applications.In this paper the common methods of sensorless control of BLDCM are introduced, and the principle of back-EMF method is illustrated in detail. The control system adopts high capability chip dsPIC30f2010. In this paper every circuit is introduced, the AD sampling circuit and hardware filter are carefully introduced. Based on the hard circuit the design of software is explained.The back-EMF amplitude is direct ratio with the speed of motor, so we can not get the position of rotor when the motor is still. Because of this we have to use special starting method. After discuss "three-step" starting procedure which is locating, accelerating and switching, we discuss a new starting method which is locating, switching. We clearly explain this method and the conditions whether this method can be used. The test proved that this method is resultful. We discuss the effect to the phase which turned off when use different PWM modulating way. We design software filters to induce the disturb and the impulse cased by the diode.The results of the experiment show that this system , which is made on the base of the theory above, can control the sensorless BLDC motor to complete the exact commutation. The system presents good static and dynamic performance. 更多还原

Studies on Transdermal Delivery System of Electret Meloxicam Patch

　　Studies on Transdermal Delivery System of Electret Meloxicam Patch
　　Transdermal drug delivery system (TTDS) is a new formulation which treats or prevents diseases by the skin administration. TTDS can maintain drug blood level, avoid hepatic first-pass elimination, decrease side effects, and extend drug effective time, facilitate and enhance long-term treatment of patients with compliance. However, there are only limited number of chemicals, which have low molecular weight (<500), low melting point (<200℃), low-dose (≤20mg·d-1) and high lipophilicity (log P = 1～3), are neodymium standard state suitable for TDDS due to the barrier function of the outmost layer of the skin.Meloxicam is a small molecule and lipophilic drug with the molecular weight of 351.41 and LogP=1.01. Its daily dose is less than 10mg and melting point, determined in our experiment, is 247.1℃.As a whole, meloxicam is suitable for TDDS.However, it is difficult for some drug to achieve therapeutic effect because of physiological barrier function of the stratum corneum. Therefore, it is of much importance to overcome barrier effect of skin and to promote penetration amount of drugs within a certain period of time.Some strategies, consisting of chemical and physical enhancers, have been investigated and developed in order to overcome the barrier properties of the skin and thus enhance drug transdermal absorption.
　　Penetration enhancers, such as Azone, ethyl oleate, menthol, propylene glycol, dimethyl sulfoxidend are commonly used. On the other hand, iontophoresis is an enhancement technique that improves transdermal drug transport through the application of a low-level electric current.Eelectret is the electrostatic equivalent of a permanent magnet and can generate internal and external electric fields. Our previous studies indicated that electret can improve the circulation of blood, enhance the wound healing, regulate the cell growth and apoptosis, modify the electret state of skin, and enhance the transdermal drug delivery.The primary aim of this paper was to characterize enhancing effect of electret on the maloxicam transdermal absorption through rat skin as compared with chemical enhancers, to understand in detail the magnetic materials possible mechanisms by which electret enhances molecular transport across the skin, to investigate the possible synergic effect of the application of chemical enhancers and electret, to prepare a meloxicam electret patch formulation and to study its pharmacodynamics for inflammation and pain.
　　The solubilities of meloxicam in octanol or phosphrte buffer solution (PBS) with different pH were determined by UV method and the partition coefficient was calculated accordingly. The results showed that (1) The octanol-water partition coefficient of meloxicam logP was 0.97 which is similar to the reported value. (2) The solubility of meloxicam increased with the increasing of pH of the buffer solution. The in vitro permeation study indicated that (1) 1%, 3% and 5% azones show a 1.18, 1.33, 1.26 times increase of the cumulated permeation amount of meloxiam in 10h as compared with that of in control group(p<0.05).The enhancing effect was ranged in following order: 3% azone >5% azone >1% azone; (2) Most of the chemical enhancers used in this study were shown to have enhancing effects except for 20% propylene glycol. Among them, 10% ethyl oleate was proved to be the most effective one, showing a 1.86 times increase of the cumulated permeation amount of meloxiam in 10h as compared with that of in control group(p<0.05); (3) Negative electret was more effective than the chemical enhancers used in this study in meloxicam trasdermal delivery, showing a 2.16 times increase of the cumulated permeation amount of meloxiam in 10h as compared with that of in control group(p<0.05); (4) Electret can improve the enhacing effect of chemical enhancers in this study. The cumulated permeation amount of meloxicam for chemical enhancer with electret patchs in 10h were 1.14 to 2.89 times that of the meloxicam patchs with chemical enhancers only(p<0.05); (5) The cumulated permeation amounts of meloxicam for 10% ethyl oleate with negative electret patch was the largest in all of the patchs, showing a 4.53 times increase as compard with that of in control group ( p<0.01). In order to explain and explore the electret enhancing mechanism, electron microscopy specimen was used to observe the rat skin’s ultrastructural change and confocal laser scanning microscopy (CLSM) was used to study the mechanisms of drug skin permeation enhancement after the rats skin was treated with electret for 2h. The studies revealed that the enhancing effect of electret on meloxicam transdermal delivery was not only through changing the structure of the stratum corneum cells to achieve, but also to a large extent through broadening the hair follicle to obtain.Based on the above findings, we prepared meloxicam patch combining 10% ethyl oleate with negative electret. The effects of the plasticizer and drug content on adhension of the patches were observed. The study showed that the more the content of plasticizer, the stronger the tack of the patch was, but the waker the cohesion of the patch was. The effect of meloxicam was opposite to plasticizer.
　　Optimal formulation was achieved by orthogonal experiment on considering the factors of cohesion of the patch and cumulated released amount of meloxicam from the patch. The methodology for determination the quality of electret meloxicam patch was studied. The results showed that electret meloxicam patch was of uniform thickness, moderate adhension. The releasing rate, stability, toxicity and irritability studies indicated that electret meloxicam patch was a safe, nontocix and non irritant formulation.In addition, the mice retortion pain models induced by acetic acid and mice auriculate tumefaction models caused by xylene were established in the paper. The results showed that the inhibitory ratio of retortion of mice induced by acetic acid in electret meloxicam patch was 63.30% (p<0.01), which was higher than that in meloxicam patch (55.85%) and oral meloxicam suspension (54.25%). the inhibitory ratio of auriculate tumefaction of mice caused by xylene in electret meloxicam patch was 34.20% (p<0.05), which was also higher than that in meloxicam patch (22.14%) and oral meloxicam suspension (24.60% ).In this paper, the electret meloxicam patch combined both the physical and chemical enhacing methods. Electret demonstrated its unique effect as a new, non-toxic, safe physical method in this Neodymium Magnets paper. The studies proved that electret could be used as excellent enhancer in transdermal permeation of meloxicam. Meanwhile, electret meloxicam patch was a kind of multiple effective anti-inflammatory analgesic patch, which integrated chemical and physical treatment into a one. It took advantage of the pharmacological effects of meloxicam and characteristics of electret which can adjust skin in biological electret state and weakened pain caused by injure and improved the effect of the analgesic drug.

直线式自发电技术探索研究

　　直线式自发电技术探索研究
　　With the development of intelligent and smart munitions, the demand of anti-highoverloading, transient high power, ten-year’s storage or longer and miniaturization poweron munitions is extremely urgent. The physics power not only has nondestructive testingand reusable characters but also has advantage in long storage and using of high and lowtemperature. And because of the use of the high quality permanent magnetic materials,more neodymium standard state and more military experts in the world pay attention to the micro physics power onmunitions.This article discusses how to transform high overload line inertial force to theelectricity generation driving force in artillery launch process. First the article makes thebasic theory of magnetic circuit about straight line electric power facility, in thisfoundation establishes magnetic circuit computation matfiematical model, makes theequivalent magnetic circuit graph, and also infers magnetic circuit equation about how tosolve straight line electric power facility, then makes the use of ’matlab’ solving air gapmagnetic flux and electromotive force, thus realizes the ’circuit ’simulation about thestraight line electric power facility. Second, magnetic materials the article makes the use of maturecomputation magnetic field software ’ANSYS’ to the thorough research, considers manykinds of factors which affect the magnetic field, obtains mass data and curves. And makesthe comparison of magnetic circuit computed results, fits various parameters how toinfluent the electromotive force, after optimization obtains the referenced parameters.

Simulation and Study on Power Train of ZH Micro-Hybrid Electric Vehicle

　　Simulation and Study on Power Train of ZH Micro-Hybrid Electric Vehicle
　　Hybrid Electric Vehicle (HEV) is the vehicle that is powered by internal combustion engine (ICE) and motor together. It makes full use of the two power sources and can optimally match their power, So that it can enlarge the efficiency of the overall system. At present HEV has been researched hotly inland and oversea. With deep research of 863 Electric Vehicle huge projects, HEV will be next vehicle. Now some automotive works have been released their sample of HEV inland. For example, the First Automotive Work group has been released their HEV of middle bus and Hongqi HEV; and Dongfeng group has been released HEV of middle bus and Dongfeng HEV; and Qirui has been neodymium prices released its BSG and ISG and so on.This paper is research on the power system of Zhonghua mild HEV that based on“Research on technology keys about Zhonghua HEV”(2005AA501770)of“863 Electric Vehicle huge project”. To achieve aim of the mild HEV, firstly researching on theory about reducing fuel and choosing parts of the power system, secondly compiling control strategy and applying ADVISOR simulation soft, finally simulating and analysis on power system.Firstly this paper researched advantage of 42 voltage vehicle electrical source system, and analyzed energy distribution of the conventional vehicle. Through analyzing the micro HEV、the mild HEV and the full HEV, a 42 voltage power system of the mild HEV that based on ISG(integrated starter/generator).
　　The power system is composed: engine is mature gasoline 4G63; motor is permanent magnet direct current brushless motor that starter coil and assistant coil are different; battery is mature http://www.999magnet.com/products/142-neodymium-prices lead-acid battery; gearbox is five speeds. Secondly through researching on theory about reducing fuel and configuration foundation, this paper designed the mild HEV control　 strategy suiting to this power system, and designed hardware and software of this control system. Basing on standard and protocol of CAN(controller area network) bus, designing the protocol、hardware and software correction to CAN.Finally under the environment of MATLAB/Simulink, regarding ADVISOR as the simulation platform, the 42 voltage power system’s simulation models are constructed based on modification of“Insight”simulation modules of ADVISOR. Including control strategy module engine open-closed module motor controller module and battery module. According to test data and result of every parts of the power system, then the dynamic performance and fuel economy on the ECE-EUCD, UDDS and Japan 10-15 driving cycle are simulated by ADVISOR soft. Compared with the conventional vehicle of similar dynamic performance, the fuel economy and dynamic of the mild HEV are greatly improved.Conclusion: The whole design, modeling and simulation have reached the anticipated design object.

Magnetic Compression Ostomy as New Cystostomy Technique in the Rat: Magnacystostomy

　　Magnetic Compression Ostomy as New Cystostomy Technique in the Rat: Magnacystostomy
　　Ibrahim Uygun , Mehmet Hanifi Okur , Hasan Cimen , Aysenur Keles , Ozben Yalcin , Hayrettin Ozturk , Selcuk Otcu
　　Department of Pediatric Surgery and Pediatric Urology , Medical Faculty of Dicle University , Diyarbakir , Turkey , Department of Pathology , Medical Faculty of Dicle University , Diyarbakir , Neodymium Magnets
http://www.999magnet.com/products/110-sintered-neodymium-magnets Turkey , Department of Pathology , Hospital of Children , Diyarbakir , Turkey , Department of Pediatric Surgery and Pediatric Urology , Medical Faculty of Abant Izzet Baysal University , Bolu , Turkey
　　Objective To report the first creation of magnetic compression cystostomy (magnacystostomy) using an easy and simple new technique in rats. Magnetic compression anastomoses (magnamosis) have been previously described for gastrointestinal, biliary, urinary, and vascular anastomoses. Methods Female rats were randomized into 2 groups (n = 10 each): a magnetic cystostomy group and a formal surgical cystostomy group as the control group. In the magnetic cystostomy group, a very small cylindrical magn ...et was inserted into the bladder. The external magnetic ball was placed subcutaneously into the suprapubic region, and the 2 magnets were coupled together strongly. On postoperative day 20 in the magnetic cystostomy group and day 10 in the surgical cystostomy group, the rats were killed, and the cystostomies were evaluated macroscopically, histopathologically, and by mechanical burst testing. Results In the surgical cystostomy group, 3 rats died. In the remaining rats, no evidence of complications was observed. However, mild adhesion in 1 rat in the magnetic cystostomy group and moderate adhesions in all the rats in the surgical cystostomy group were observed. No significant difference was found in burst pressure between the 2 groups (mean 162 mm Hg in the magnetic cystostomy group [n = 6] and 185 mm Hg in the surgical cystostomy [n = 5] group). However, the procedure time between the magnetic cystostomy group (7.70 ± 1.64 minutes) and surgical cystostomy group (18.50 ± 2.01 minutes) was significantly different ( P < .001). Conclusion Magnacystostomy is easy and safe in the rat model and could be useful for some suprapubic cystostomy procedures in humans.

Study and Design of Brushless DC Motor Control System Based on DSP

　　Study and Design of Brushless DC Motor Control System Based on DSP
　　With the development of high permanent magnetic material, modern power electronic technology, computer control technology , furthermore, the emergence of MCU and high performance DSP specially Cast Alnico Magnet used to control motors, it becomes possible in recent years to make a typical model of brushless DC motor and to be widely used. Thus, brushless DC motor is a new device involving in many subjects. It has advantages of high speed, high efficiency, high dynamic response, high temperature bearing capacity and reliability. It also behaves a long life and low noise characteristics. There are extensive applications at many realms, such http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php as computer system, electrical home appliances, Industry, traffic and the medical equipment and so on. The research of brushless DC motor is an important topic now in China,.DSP is developing in the foundation of variable theories and arithmetic,

Study on Digital Magnetic Measurement Method and System Based on Electromagnetic Induction

　　Study on Digital Magnetic Measurement Method and System Based on Electromagnetic Induction
　　During the past 30 years, the magnetic technology which is represented by the electromagnetic actuator, the permanent magnet technology and their applications has been developed greatly. The magnetic technology has many applications. In this case, the magnetic measurement technology has also been advanced and becomes the research hotspots in the related field. In our country, the traditional analog measuring devices are not satisfied. Therefore, it is urgent to develop a digital magnetic measuring system which can satisfy the need of the industry and scientific research.Based on the Faraday’s neodymium prices law of electromagnetic induction, the thesis presents a digital magnetic measuring system with human operation interface whose core is the MSP430F149 single chip, and studies the theories and technology referring to the sensor and inspecting, the data treatment and the results output in the system. Then series of measuring experiments are carried out with the system, and the results indicate that this magnetic measuring system can meet the prospective requirements.Firstly, the paper reviewed the development and research status quo of the magnetic measurement technology in and out of the country, and pointed out that the magnetic application and magnetic measurement technology’s mutual promotion accelerated the appearance of some new ways and technology in related field and deepened the magnetic measurement theory http://www.999magnet.com/products/142-neodymium-prices and technology.
　　The research focus on the digital minitype magnetic measurement device and the 3D digital middletype one are the research hot issues. Then, the related theory and technique of magnetic measurement based on electromagnetic induction are presented. The referring magnetic laws, the digital techniques and the measurement methods for absolute time-changing field, the position-changing field and the time-position-changing field are all included in this chapter. Besides, measuring different system’s magnetic field, the coil sensors with various shapes and the data treatment method are studied. In the following chapter, the paper has discussed the problems of magnetic measurement using Helmholtz coils, setting up the Helmholtz coils model, analyzing the magnetic field with finite element

Research on the Control System of Double-Side Linear Electrical Oil Pumping Unit

　　Research on the Control System of Double-Side Linear Electrical Oil Pumping Unit
　　The energy transformation and delivery of traditional beam pumping unit power equipment are so complex that the efficiency and reliability of beam pumping unit are poor. Linear electrical pumping unit is a revolution of the energy transformation and delivery mode, can improve the efficiency of pumping unit, can realizes the smooth pumping parameters and the suspension center movement variation with pumping situation, and gives a good foundation for intelligent pumping unit. The linear electrical pumping unit is a revolution of pumping unit structure. The driver and control system in Neodymium Magnets the paper is an important part of the special linear electrical pumping unit, which is the first the double sides permanent magnetic brushless DC linear motor applied in the pumping unit.First, with the information of the oil pumping equipment in nation and abroad, the pretend of the oil pumping equipment is proposed, which indicates that it is good choice to apply the linear motor in the oil pumping, because the characteristic of linear motor is suit for the oil pumping.Then the working process of the linear electrical pumping unit is introduced. Three phase double-side linear brushless motor is chosen for the great force characteristic, high efficiency, simple structure and control characteristic.The drive and control system is the main body of the paper.Hardware of the drive and control system is based on TMS320LF2407A with powerful functions, transforms the power energy into PWM to drive and control the motor and realize the protective function by protective circuit. Software of the http://www.999magnet.com/products/110-sintered-neodymium-magnets drive and control system realizes the current and speed closed-loop control, which contain PI adjuster.
　　The control system could realize the step stroke variation and commutation by switch signal and corresponding software. Otherwise, we have got the way to realize smooth stroke variation based on the phase change signal count.Speed detection is one of the key technologies of speed control, but the traditional Hall position sensor’s way applied in the first experiment has poor precision at low speed, then we propose a novel speed detection way, which changes the traditional speed detection mode, gets the speed by induced electromotive force produce by a coil moving with the mover. The novel way could improve the

Wind Force Solar and Gas Supplementary Heating System Design and Simulation

　　Wind Force Solar and Gas Supplementary Heating System Design and Simulation
　　Today energy sources dried up and environmental pollution is more and more serious, the people are long for that renewable energy sources take the place of rule energy resources, the pollution environment conventional energy source. It is indicated that the solar energy and wind force can be richest renewable energy in the research and the practice, they distribute widely, may regenerate, does not pollute the environment, are the neodymium prices internationally recognized ideal substitution energy sources.This paper is take the renewable energy comprehensive utilization as the guiding ideology, can has the good complementarity according to the solar energy in the resources condition and the technical application characteristic, carries on the integrated system design and the simulation.In the paper through to the wind force and solar hybrid heating system and originally heating system cost accounting comparison, has confirmed the wind force and solar hybrid heating system energy conservation feasibility, and according to the heating system structure, has determined the system principle of work, the movement way and the function; Has designed a set in this foundation take the AT89S53 monolithic http://www.999magnet.com/products/142-neodymium-prices integrated circuit as the control core, by the sensor, changes delivering, the signal recuperates the intelligence control system which, component and so on monolithic integrated circuit, functional element, monitor and keyboard is composed, and to the control system in each module function, the principle of work has made the detailed narration; Also elaborated the wind energy basic theory, established the wind speed, has straight driven the type permanent magnetism synchronous generator the mathematical model.Finally, utilizing Matlab7.1/Simulink5.0 simulation software, the wind force generation system each constituent simulation model is established, and the simulation model has been carried on. It is known through the simulation graphs the simulation model established is correct.

Research on Power Control Technology for Stand-alone Small Wind Power Generation Systems

　　Research on Power Control Technology for Stand-alone Small Wind Power Generation Systems
　　For stand-alone small wind power generation systems, the Maximum Power Point Tracking (MPPT) control is an important method of improving power conversion efficiency, and the reasonable management and control of battery is an important means of prolonging their life. A power control strategy, which combines MPPT control and charging and discharging control of batteries with load tracking control, is given to make the small wind power generation systems to operate in both optimal and reliable conditions in this Cast Alnico Magnet thesis. Firstly, the background of research work is introduced, and the domestic and oversea development of wind power is summarized. The configuration of small wind power generation systems with simple structure, which consists of wind turbine, PMSG, diode rectifying bridge, Buck converter, batteries, and controller, is put forward to realize the power control strategy.
　　Based on the analysis of work principle of the system, the mathematic model of components and simulation model of entire system are established, and the relationship between output power of turbine and duty of Buck converter is calculated and drawn.Secondly, after analyzing several MPPT methods such as the small sine perturbation, optimum torque curve and perturbation observation, a variable step perturbation MPPT method is http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php given, and the charging and discharging control of batteries is discussed. Based on analyzing the relationship between output power of turbine, and load power and batteries state, a power control strategy which integrates variable step perturbation MPPT, charging and discharging control of batteries and load tracking control is given for the small wind power generation systems. The simulation results show that, compared with the fixed step size MPPT, the variable step perturbation MPPT achieves better performance in precision and rapidity for the small wind power generation systems.Finally, the structure and parameters of main circuit for power control is designed in detail, and the inductor and Buck converter are made and tested in lab. The experimental results prove that the main circuit is feasible and correct.

ICP-MS测定镝铁合金中杂质元素的分析方法研究

　　ICP-MS测定镝铁合金中杂质元素的分析方法研究
　　Dysprosium-iron alloy is an important additive of Nd-Fe-B permanent magnetic alloy. Dysprosium-iron alloy is requested to be more and more pure in order to meet the demand of final products. There are limited reports on analytical method of Dysprosium-iron alloy except Arc Atomic Emission Spectrometry and ICP-AES which possess such disadvantages as low sensitivity of partial elements , short of prime standard, labor intensity and rubber magnetic sheet limited application range. Methods have been proposed for the determination of impurities in dysprosium-iron alloy by ICP-MS in this paper. The methods, which are simple and rapid with accurate results, can highly meet the requirements of product inspection. In addition, economic and social benefits can also be achieved.The method has been developed for determination of rare earth impurities in dysprosium -iron alloy by ICP-MS, and the operation condition of the instrument was optimized and the correction equation was established.
　　The reliable quantitation limit are 0.2μg/g for La, Ce, Eu, Er, Tm, Yb, Y; and 0.4μg/g for Pr, Nd, Sm, Gd, Tb, Ho, Lu. The recovery of standard addition is 93-102%, RSD is less than 5%.The accuracy of the results obtained is confirmed by the determination of elements after standard addition procedure. The method is accurate, rapid and applicable to routine analysis.The method has been developed for determination of nonrare earth impurities (A1, Mg , Ni, Mn, Cr, Cu, Pb, Co, Zn, As, Cd, V) in dysprosium-iron alloy by ICP-MS. The limits of determination are all less than 1μg/g, The recovery of standard addition is 95---109%,RSD is less than 10%.The method has been developed for determination of refractory mental impurities (Ta, Nb, Zr, Hf, W, Ti, Mo) by ICP-MS after the complexation of hydrofluoric acid. The interference http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php of salts deposition and dysprosium fluoride and the function of internal standard method have been investigated. The limits is less than 0.5μg/g. The recovery of standard addition is 93～105%.RSD is less than 10%.The influencing factors on uncertainty of measurement result for tungsten in dysprosium-iron alloy are studied by ICP-MS. The components of uncertainty of measurement result are analyzed and calculated. The expanded uncertainty of measurement result for tungsten is 12.28μtg/g when mass fraction of tungsten in the dysprosium-iron alloy is 97.5μg/g.The interference of dysprosium-iron alloy has been studied .The mass and non-mass spectra interferences of dysprosium-iron alloy have been discussed. The reasons why interferences occur as well as the removal methods have been presented.