Analysis and Optimization of 12/8-pole Doubly Salient Permanent Magnet Motor

　　Analysis and Optimization of 12/8-pole Doubly Salient Permanent Magnet Motor
　　Doubly salient permanent magnet (DSPM) motor is introduced in 1990s as a novel controllable AC speed regulating system. This DSPM motor essentially adopts the same structure as a SR motor but with permanent magnets placed in the stator or rotor. This kind of machine offers the advantages of higher power density, higher efficiency, and wider speed range compared to the other motors. When the rotor diameter bigger or running at high speed, PM located in the stator of the motor will exceed its intensity due to the centrifugal force exterior of the motor rotor, destroy the neodymium standard state PM. So the stator located PM motor is studied in this paper.The basic theory and evolution are described. On the base of comparing with SR motor, the structure and running principle of DSPM motor are introduced.Due to the high nonlinearities of the DSPM motor, the new method FEM is used to analyse the magnetic field distribution,
　　PM flux linkage, back EMF, inductance, torque ripple, and etc. To enhance the power density and decrease torque triple, The structure of the motor is studied as a emphasis in this paper. The size of permanent-magnet and thickness of airgap are the two most immediate and obvious factors, which influence the torque ripple. These two aspects are analyzed particularly by using the finite element method (FEM) in this paper. Point out the relationship between torque ripple and PM width and airgap thickness. And give some constructive results and advices for motor http://www.999magnet.com/products/112-neodymium-standard-state design in this paper.On the base of previous FEM analysis and motor design rule, a 1000W DSPM motor is schemed out, the structure parameters and electric parameters are figured out and given. Then using the finite element method (FEM) calculates and emulates the output torque of DSPM motor designed. The result is equal to the theory, and validates the validity of the design.A new effective method fuzzy control is used to control DSPM motor. The mathematics model is showed in this paper, and then designs a fuzzy controller with fuzzy control based on the motor characters and theory of fuzzy control. To test the validity of the design, Matlab is used to emulate the motor drive, The results prove better running character and speed regulating of the DSPM motor drive .

Design and Research of Hybrid Excitation Permanent Magnet Synchronous Generator

　　Design and Research of Hybrid Excitation Permanent Magnet Synchronous Generator
　　The hybrid excitation permanent magnet synchronous generator (HEPMSG) has many advantages, such as simple structure and high reliability. It can realize the adjustment of exciting magnetic flux and expand the application domain of permanent magnet electrical machines. The research of the paper is carried out around the development of HEPMSG, five parts are included as following:First of all, based on analysis with 3D finite element on HEPMSG, the magnetic circuit is simplified and the calculation model of air-gap magnetic density for permanent magnet and iron poles neodymium prices magnetic circuits are concluded, the model is valid by finite element calculation.Second, based on research and calculation method of inductance parameters for permanent magnet electrical machine, the finite element calculation and testing method of HEPMSG are presented.In this paper,
　　the voltage characteristic and inherent voltage regulation are deeply analyzed and the mathematical model of relation of inherent voltage regulation and performance parameters is presented on the basis of double-reaction theory. The influence of the performance and the structure parameters on the voltage characteristic is quantitatively analyzed.Some important coefficients including leakage coefficient, air-gap coefficient and waveform factor of armature reaction are studied and validated by electromagnetic software ANSOFT. The selecting principle of main configuration dimensions such as stator, permanent magnet and the slot for locating the dc exciting winding and http://www.999magnet.com/products/142-neodymium-prices electromagnetic design principle is presented. Based on above studies, the program for electromagnetic design of HEPMSG is developed.On the basis of research on voltage harmonic distortion of permanent magnet electrical machines, a method for predicting and calculating the harmonics of no-load is derived by the finite element and FFT. The low voltage harmonic distortion is achieved by optimizing the shape of permanent magnet.At last, based on above theories a prototype of HEPMSG with rated power 7.5kW and four poles is manufactured. Experiment results and theory analysis is almost same and output voltage of generator is effectively adjusted by regulating the DC excitation current, which shows the theory of HEPMSG is feasible.

Design Research of Six-phase Disc Permanent Magnet Synchronous Motor

　　Design Research of Six-phase Disc Permanent Magnet Synchronous Motor
　　Disk permanent magnet synchronous motor (PMSM) is a kind of axial flux motor. At present, it is has been developed abroad soon. As a high performance servo motor and high moment driving device, disk PMSM has been widely used in the mechanical and electrical integration products. There are many characteristics of low mass, little volume, compact structure, no loss in rotor, low moment of inertia, small electromechanical time constant, high proportion of torque to mass, steady running status in low speed in this motor. And it can easily be designed to more modules to heighten torque. As a perfect driving device, it could be used in many fields, such as numerical control Neodymium Magnets machine, robot, electric vehicle, home appliance and so on.This paper studies the design of disc permanent magnet synchronous motor. The major works are in the follows. Firstly, to get better power density, a new disk permanent magnet synchronous motor is proposed. Magnetic field analysis and calculation are completed according to the research of the structure. Based on the research of the magnetic field distribution characteristics of disc permanent magnet motors, electromagnetic design process of disc permanent magnet motors with the diving ring way is compiled.
　　By comparing with the prototype design value and measure results, electromagnetic procedures of disc permanent magnet motor has been improved and amended. A practical and reliable CAD software has been established now.In the design of disc permanent magnet synchronous motor , with the six-phase motor with 22 poles and 24 slots presenting, the motor size is decreased and produce technology is reduced. On the basis of optimization of the shape of permanent magnet by the use of Fourier analysis and finite element method, it can make permanent magnet motor gap http://www.999magnet.com/products/110-sintered-neodymium-magnets magnetic distortion and torque ripple reduced. The influence of the performance of the back-EMF wave and cogging torque in the different width of slot openings is quantitatively analyzed. by a comparative study of the torque density of disc and radial permanent magnet motor from sizing equation, the relationship of two motors’torque density has been analyzed. The main parameters formula of the six-phase disc permanent magnet synchronous motor is also put forward, such as armature reactance and slot leak reactance. The corresponding finite element method of these parameters also been introduced. the two results are basically the same. Based on research of the leakage coefficient of the structure with little-pole and much-tooth ,the finite element calculation of leakage coefficient is presented.Finally, based on above studies a prototype of DPMSM with a one-rotor-two -stators configuration and rated power 5kW has been designed the tests have been finished. Experimental Measure results and theoretical analysis are basic agreement.

Analysis of Multi-disc Coreless Permanent Magnet Synchronous Motor Based on Halbach Array

　　Analysis of Multi-disc Coreless Permanent Magnet Synchronous Motor Based on Halbach Array
　　Disc permanent magnet synchronous motor is a new type of high performance servo motor developing in recent years. It has the characteristics of short axial size, light weight, small volume, close structure and so on. The motor can be made into a multi-disc structure made up of multi-rotor and multi-stator in order to improve the torque. This multi-disc structure motor applies very well to robot and equipment of large torque direct drive. In the meanwhile, the axial size of disc motor is limited because of the structure. Too big radius increases the difficulty of processing technology. The Block Ceramic Magnets interrelated size of motor can not be assured. So multi-disc structure is always used in order to improve the output power of the motor.The development of permanent magnet machines tends to great power, high function and micromation at present. High power density and efficiency are the common requests to all the permanent magnet machines designing. This text introduces a new type of multi-disc coreless permanent magnet synchronous motor based on Halbach array to improve output power. The motor uses high coercive force characteristic of NdFeB permanent magnet material and high gathering magnetism function of Halbach array to improve airgap magnetic flux density in the motor.
　　This also makes coreless motor possible. Moreover, Halbach array can reduce magnetic flux in the yoke. So yoke iron can be less used or not used. This will greatly decrease the weight of the motor and also save the cost of the motor.As a new type of motor, there are many differences in structure and calculation method between disk coreless PMSM and common permanent magnet motor. Design theory of common permanent magnet motors can not be used directly. The structure and the characteristics of the motor using HALBACH array are also introduced. The FEM analysis has been done to build the mathematics model and study the magnetic field characteristics of the http://www.chinamagnets.biz/Ceramic/Block-Ceramic-Magnets.php motor. The text studies hot to choose Halbach array, optimizing air gap structure—wedgy air gap, choosing structure form of multi-disc permanent magnet motor-- unit motor combined structure, arrangement between unit motors. And finally the interrelated design parameters of permanent magnet and arrangement between unit motors are determined according to the results of the FEM analysis.The text sums up processing technology of disc coreless permanent magnet synchronous motor based on Halbach array, solves the problems of the whole/half axial machining technics, the inner/outer rotor structure technics, the fixation of the PMs, the rotor’s perfusion and so on.. And the special technics equipment for machining of the motor has been designed. Lastly, software for electromagnetism calculation is compiled.

双转子永磁风力发电机研究

　　双转子永磁风力发电机研究
　　Wind energy is renewable resource. More and more experts began to put an emphasis on permanent machine with high efficiency for wind energy system. Supported by Shandong Science and Technology Development, This thesis study an novel machine—the dual-rotor radial-flux permanentmachine. Because of it’s high efficiency and special structure, it hasa big advantage on the small wind energy system. The research of the thesis mainly includes the following points:In the first part, the structure、Equivalent magnetic circuit model and the principle of the machine is discussed. Then compute the inductance of the dual-rotor permanent machine.The second part gives the Alnico magnets permanent magnet emf of analytical method and finite element analysis. First of all, considering the stator slot, the no-load air-gap magnetic flux distribution and the permanent emf can be expressed by using air-gap relative permeance function, and then give the corresponding waveform. Secondly, the permanent EMF is inferred using a Method of Vector Synthesis .
　　In order to check the analytical method, a finite element analysis is implemented to study the air-gap magnetic flux distribution and the permanent emf. Through the comparison, the analytical method and the finite element analysis are in good agreement. At last, the thesis presents three methods to reduce the permanent emf fluctuation using the theoretical analysis, proves the methods are feasible.The third part analyzes the permanent emf and the cogging torque of the halbach machine, because the halbach machine has a great advantage on the wind energy system. http://www.999magnet.com First of all, the principle of the halbach array is presented. Secondly, a finite element analysis is implemented to study the air-gap magnetic flux distribution and the permanent emf. At last, the thesis calculates the cogging torque using electromagnetic software. The thesis presents three methods for reducing cogging torque fluctuation to the halbach array dual-rotor machine, through the finite element analysis, the methods are proved to be feasible.The forth part discusses the design thought, bringing forward thought that we can design the inner and outer part respectively, and then adjust the two parts of the machine generally, we give the mode of the machine and make some experiment. We measure the permanent emf waveform at different speed、voltage—speed curve、voltage—current characteristic curve on the load and measures the inductance of armature reaction. Through the comparison , the value of experimental、theoretical and finite element analysis are in good agreement.

Mechanical Design and Simulation for Axial-field Permanent-magent Direct Current Generator

　　Mechanical Design and Simulation for Axial-field Permanent-magent Direct Current Generator
　　Since the global warming effect and the energy crisis, renewable energy such as tide energy, wind energy, and solar energy has become more and more important. Thus, wind power generation with outstanding performance in energy generation, has become research Special shape NdFeB magnets emphasis in many countries. Specially, the direct-drive, variable-speed, constant-frequency generation technology is paid great attention for its relatively high efficiency.The axial-field permanent-magnet direct current generator is well known for compact structure, excellent ventilation, and high efficiency. The generator is often driven directly by windmill, which means that it is extremely suitable for direct-drive variable-speed constant-frequency wind turbine.In this thesis, the axial-field permanent-magnet direct current generator is mainly discussed combined with the traditional wind power technology. The key items are as follows:(1) Background information collecting part contains summary of the research status of the wind power generator and introductions about the history and future of the axial-field permanent-magnet direct current generator.(2) Theory preparation http://www.999magnet.com part includes study in the structure, principle, and electromagnetism theory of the axial-field permanent-magnet direct current generator. The feasibility and superiority of the generator is explained.(3) The parameter calculation part contains the parameter calculation and design using equivalent magnetic current analytical method.(4) The simulation part: Ansoft Maxwell 3D has been using to analyze the static electromagnetic field and transient electromagnetic field of the generator. The detail-included result is then compared with the ideal parameter calculated in chapter 3.

永磁同步电机伺服系统设计及应用研究

　　永磁同步电机伺服系统设计及应用研究
　　Due to the advantage of high torque, small volume, compact structure, high operation efficiency and excellent speed performance, the permanent magnet synchronous motor (PMSM) has been widely used in home appliances and industrial automation servo system. The research of PMSM servo system becomes urgent. Especially with the fast development of digital signal processor, power electronics technology and modern control theory, the realization of the good performance neodymium magnets such as: fast response, accurate tracking, reliability, flexibility and robustness become possible and valuable. In this paper, a digital PMSM servo system is realized with the Microchip’s digital signal controller dsPIC, and the designed system has been applied in a industrial application.In this paper, the mathematical model of PMSM is analyzed, and the vector control simulation model of PMSM is established in MATLAB/simulink, including the vector conversion model, space vector PWM (SVPWM) generating model and PI regulator modules. The space vector control strategy and its dual-loop regulation for PMSM are validated in the simulation model.
　　According to the control requirements, the hardware of the drive system for a 550W PMSM is designed. In the system, Microchip’s dsPIC and Mitsubishi’s Intelligent Power Module IPM are used as the controller and power inverter-bridge respectively, and the power supply, isolating circuit, position feedback, current feedback and various protective circuits are realized as well. On the designed hardware platform, the software implementation Scheme of field oriented http://www.chinamagnets.biz control strategy with id =0 is designed by using the integral separated PI control algorithm. The software adopting modular programming is programmed by using C language and assembly language, the combining programming method ensures the software’s flexibility and the systems’real-time response. With all the hardware and software, a high reliability, fast response, high stability and wide speed servo system is realized.Finally, the servo system of PMSM is applied in an industrial lockstitch sewing machine (ILSM). The requirements of ILSM such as fast startup/brake, precision needle-position control and automatic functions are analyzed, and the corresponding solution is presented. By applying the presented solution and the basic PMSM servo system, the sewing system gains fast response, accurate position performance, high efficient and high-quality operation.The practical application results in ILSM validate the PMSM servo system is reliable and feasible.

基于DSP的对转永磁无刷直流电动机控制方法研究

　　基于DSP的对转永磁无刷直流电动机控制方法研究
　　The thesis focuses on the control system of sensorless Contra-rotor permanent magnet brushless DC Motor. Its application foreground in Conta-rotor propulsion system will be wider.That has all advantages of the permanent magnet brushless DC Motor,such as high power density, good timing, high efficiency,simple structure, high reliability and easy maintenance.The difference between them is only that the magent part and the winding of the CRBLDC are rotoring at the same time. Alnico magnets Because the direction of the two part received electromagnetic torque is reverse all the time, the two part circumrotate in the reverse direction to a certainty.This paper introduce the advantage and application of Contra-rotor permanent magnet brushless DC Motor, and introduce the difference between the CRBLDCM and the permanent magnet brushless DC Motor. The basic elements and the operating principle of the control systemof CRBLDCM are analyzed in detail. The dynamic mathematic model of CRBLDCM is construct.Then we established the simulink model of CRBLDCM with the MATLAB/SIMULINK.Second the control system of CRBLDCM is researched that is composed of the speed and http://www.999magnet.com current close loop. In the double loop of control system, a PID controller based back propagation (BP) neural networks is adopted in the speed loop and a hysteresis current controller is adopted in the current loop.And the two control system is simulated with Matlab.On the basic of the simulation researches, the thesis designs sensorless BLDCM digital control system.

基于dSPACE的永磁无刷直流电机驱动控制系统设计与开发

　　基于dSPACE的永磁无刷直流电机驱动控制系统设计与开发
　　Because of the advantages of no excitation loss, simple structure, high reliability, easy maintenance, high operation efficiency and good speed performance, the permanent magnet brushless DC motor (BLDCM) has been widely used in various fields, such as computer systems, household appliances, transport, as well as medical equipment. Nowadays, many intelligent control algorithms, which have functions of self-learning, self-adapting and self-organizing, are Neodymium Magnets being used to enhance the BLDCM operational effectiveness. However, it usually takes a long time to complete the algorithm development for the reason that the BLDCM is a multi-variable, non-linear, strong coupling target which is difficult to establish its precise mathematical model.
　　Therefore, a 2.2kW BLDCM is selected and then a new method of rapid developing drive control system of BLDCM is proposed in this paper.First of all, dSPACE, which is a type of real-time simulation tool and is produced by a German company, is introduced in this paper, including its hardware components, software environment, real-time simulation function and the steps of using dSPACE to develop control algorithm. And we conclude that the development progress of BLDCM controller can be apparently accelerated by using hardware-in-the-loop simulation (HILS) technique based on dSPACE.Secondly, the speed solution of a 2.2 kW BLDCM is specified http://www.999magnet.com and then the corresponding drive system is designed, including the rotor position detection subsystem, the power supply subsystem, and the inverter circuit subsystem etc. Sequentially, a HILS platform of BLDCM drive control system based on dSPACE is presented, corresponding functional modules are defined, and then a rapid control prototype (RCP) of BLDCM is designed. Among them, four digital models are created by using Matlab/Simulink, and their interfaces with external hardware are created by using dSPACE/RTI.Finally, in order to testify the feasibility and the effectiveness of the proposed method, it is applied to develop a new generation of commercial treadmills for a well-known domestic enterprise. The characteristics of the commercial treadmills’load and transmission are analyzed, solutions of key issues associated with its special requirements are presented, and then a drive and control system of commercial treadmills based on the BLDCM is developed.Experimental results validate the proposed method. It is very promising for practical applications.

Grinding of Sintered Nd-Fe-B Magnet and Study on Computer Simulation Technology

　　Grinding of Sintered Nd-Fe-B Magnet and Study on Computer Simulation Technology
　　Sintered Nd-Fe-B is a new kind of rare earth permanent magnets, and it is the third generation permanent magnetic material following foundry magnet and ferrite magnet. Sintered Nd-Fe-B needs to be machined after sintering. It is a kind of typical difficult-to-machine material because of its high brittleness, small plastic deformation, high rigidity and low thermal stability. Ball Neodymium Magnets Grinding is an effective machining method for this material, and it is also the main method for achieving the good surface roughness. Grinding force and temperature may be reduced when admitting ultrasonic vibration in the grinding process, and loading of grinding wheel rarely takes place, the material removal rate (MRR) could be increased simultaneously. The ordinary grinding and ultrasonic vibration aided grinding of sintered Nd-Fe-B magnet were studied in the thesis. The research contents are as follows:The controlled-force radial ultrasonic vibration aided face grinding of sintered Nd-Fe-B magnet was investigated. The grinding force and speed in the process of the grinding were analyzed. The grinding force is the composition of forces which were the one produced in radial vibration assisted grinding and the one put on in the controlled-force grinding, while the grinding speed is from ultrasonic vibration speed and wheel circular velocity. The theoretical model of grinding force in the controlled-force radial ultrasonic vibration aided face grinding was put forward. The effect of grinding parameters and ultrasonic vibration on the MRR was studied. The MRR increased with the increase of the normal grinding force, and when the grinding speed was increased, the MRR increased correspondingly. On the other hand, the MRR increase when admitting ultrasonic vibration or grinding fluid in the grinding process.The grinding temperature model of sintered Nd-Fe-B magnet in the controlled-force radial ultrasonic vibration aided face grinding was founded. The theoretical calculation accorded well with experimental results.
　　The temperature in the controlled-force radial ultrasonic vibration aided face grinding is higher than that in the controlled-force face grinding. The reasons are the increase of grinding force, the increase of workpiece feed or the depth of cut. The prediction of grinding burn could be implemented making use of the relation between the normal grinding force and the tangential force. The ratio of them usually retained stated, but when grinding burn happened, the ratio changed. http://www.chinamagnets.biz    It can be judged whether grinding burn happened using this grinding temperature or power which could be gained through calculation or experiment.The effect of grinding parameters and ultrasonic vibration on the surface roughness were analyzed on the basis of experimental results. Surface roughness increase with the reducing of grinding wheel velocity, and the increase of workpiece feed speed or the depth of cut could also cause the worse surface roughness. The surface roughness produced by ultrasonic vibration aided grinding is worse than that of ordinary grinding. The prediction model of the surface roughness was founded by utilizing experimental data and back-propagation artifical neural network.The computer simulation system of ordinary grinding and ultrasonic vibration aided grinding was developed by adopting Visual Basic language cooperating with MATLAB language. This simulation system could optimize grinding parameters and predict grinding quality. Comprising the calculation of grinding force and the MRR, the simulation calculation of grinding temperature and the prediction of the surface quality were included. The entities machining simulation of partial ordinary grinding and ultrasonic vibration aided grinding were accomplished at the same time. Simulation results indicated that the optimized parameters and outcome prediction were in the error-tolerant range.

Fundamental Research on Axial-Axial-Flux Compound-Structure Permanet-Magnet Synchronous Machine

　　Fundamental Research on Axial-Axial-Flux Compound-Structure Permanet-Magnet Synchronous Machine
　　With the development of hybrid electric vehicles (HEVs), hybrid system is becoming the researching focus gradually. The power train system in HEV is basically divided into three types: serial, parallel and serial-parallel combined type. The serial-parallel combined hybrid system integrates the functions of the series and parallel system and has its unique advantage. The axial-axial flux compound-structure permanent-magnet synchronous machine is the key part of a novel serial-parallel neodymium magnets combined hybrid system. For the environment protection and energy conservation, it is meaningful to research the axial-axial flux compound-structure permanent-magnet synchronous machine system.Firstly, as the axial-axial flux compound-structure permanent-magnet synchronous machine being a new type of disk machine, its air-gap magnetic field distributes in three-dimension. So its simulation model is more time consuming and has higher requirement for hardware than the two-dimensional model. So the three-dimensional simulation model is researched to save computing time and hardware resource.The axial-axial flux compound-structure permanent-magnet synchronous machine is integrated by stator machine and double rotor machine.
　　The coupling between the two machines is analyzed, and the choice principle of the common rotor core is found. The pole-matching problem is researched, http://www.chinamagnets.biz and it is concluded that the two machines had better to have the same pole numbers to reduce the volume and coupling between the two machines. The static magnetic field is researched also.The paper deduces the basic electromagnetic relationship of permanent-magnet synchronous disk machine, and compares it with that of ordinary column machine. The factors that influence the power per unit volume, power per unit mass and the efficiency are investigated. According to the contrast between the compound machine and a one-stator one-rotor disk machine, the predominance of the axial-axial flux compound-structure permanent-magnet synchronous machine is obvious.Lastly, pole-arc ratio, skewed magnet and ladder-magnet are researched to improve the torque characteristic. And the effect of pole-arc ratio and skewed magnet is satisfying. So the two methods are matched and optimized again, and the optimum scheme is obtained.

Simulation Research on Permanent Magnet Linear Synchronous Motor for Vertical Movement

　　Simulation Research on Permanent Magnet Linear Synchronous Motor for Vertical Movement
　　Vertical elevator system droved by permanent magnet linear synchronous motor (PMLSM) is a new type cordless elevator, people attach importance to it increasingly because its marked excellences is distinguished from traditional lift system. Foreign scholars first conceived the idea of "Vertical lift system droved by linear synchronous motor" during 90s and in this period of time they commenced the basic and experimental research. This cordless elevator is widely used in neodymium magnets the field of elevator for tall buildings and lift system for pit. It faces fatal challenges on theoretics and technique if you want to make a horizontal running engine set up. Such challenges make this problem becomes foreland problem in field of linear motor study. Traditional lift system will happen a great change if these problems are solved, the theoretical value and the social benefits are immeasurable. Permanent magnet linear synchronous motor as the hard core of new type cordless elevator has many benefits, such as super-efficient, saving energy, doing linear movement and simple structure, convenience control, no pollution and low yawp. So far, permanent magnet linear synchronous motor as a primary drive source is one of the best subjects in this field.This dissertation analyzes and researches following problems on PMLSM for vertical movement: (1) At the circumstance of ANSOFT which is used to analyze electromagnetic field, the static calculation model of PMLSM for vertical movement is built.
　　The static characteristics of distribution of magnetic field and electromagnetic propulsive force are analyzed with finite element analysis. The results have guide meaning in PMLSM’ s optimum design and simulation calculation of dynamic characteristics.(2) In the dissertation the relative basic knowledge is introduced briefly first, then the reference frame and space vector transfer laws of the PMLSM is constructed, the mathematics model of PMLSM is built. Then the d-q synchronous coordination and the thrust equation of the PMLSM are deduced.(3) Contraposing the character of vertical lift system and uniting the mathematic model under the d-q reference frame、http://www.chinamagnets.biz thrust equation and mechanism-motorial equation, the simulation model of PMLSM for vertical movement based on SIMULINK is constructed and is masked so that it can be connected with other modules conveniently and effectively. The simulation results show that system is feasible.(4) The dissertation introduced the controlling principle and method of parameter’s regulation about PID adjustor and the modulating principle and process of modulating strategy about SVPWM. Then the models of every subsystem are given. Afterwards the model of SVPWM control strategy i_d=0 vector control system which includes speed and current double close loops is built up and realized in the SIMULINK, in addition the position-loop is introduce into system and realized too.Simulation results also show that the velocity and displacement of the mover are exact and the vector control system has favorable dynamic performances. Besides, applying simulation software to complicated system design is an available method, which can speed up the system design, increase its efficiency, and ultimately realize the system optimization.

Research of Noncontact Variable Speed Unit Based on Permanent Magnet Theory

　　Research of Noncontact Variable Speed Unit Based on Permanent Magnet Theory
　　Problems concerning energy and environment are the hot spots of nowadays world, worrying about the depletion of natural resources, and environmental deterioration, humans are busy improving the present energy consuming devices as trying to find the high-efficiency and pollution-free energy resources, aiming at make the best us of energy at all links of its flow. As the second of energy consuming countries, energy and environment problems are being listed in the relative development Neodymium Magnets programs during the Tenth Five-Year Plan period.It can not be denied that non-contact permanent magnetic gear transmission has a good effect of improving the transmission efficiency. But the important indexes evaluating such transmission are the max-torque and torque-changing value. So, the first job to study it is the torque-angle character. Typical structure of permanent magnetic transmission is permanent magnetic clutch and gear, but the torque the permanent magnetic gear can transmit is much less than that a permanent magnetic clutch can, this is a fatal defect, for such reason, little attention is paid on it, and its usage in practice is rare.This article stands on the background of nowadays researching, http://www.999magnet.com proposed this special structured permanent magnetic variable speed device, using Ansoft—an electromagnetic field analysis software—to analyze the characters under the condition of different magneticpole clearance, axis clearance, size of magneticpole, quantities of magneticpole couples, and so on. It expatiated on the following pulley’s slave motion process, discussed each parameter’s impact on the max-torque, properly compared with the traditional ones, and designed an experimental device for further verification of the theory.

The Research of Phase-controlled Switch with Permanent Magnetic Operating Mechanism in Measure and Control Technology Based on DSP

　　The Research of Phase-controlled Switch with Permanent Magnetic Operating Mechanism in Measure and Control Technology Based on DSP
　　Nowadays, with the high-speed development of scientific, mass of high-powered electronic elements and control elements appeared. Their appearances create many new way to realize some control methods which were rather impossible before. This development is reflected to switch device field, and make the intelligent switch developing rapidly.This paper analyzes the neodymium magnets domestic and overseas actuality of phase-controlled switch which was the key technology of intelligent switch. And point out that applying permanent magnetic operating mechanism in vacuum switch is the just way to solve the problems like too much operating parts, low reliability etc. in switch system. Then brings up hardware structure of the measure and control system with phase controlled based on the analysis, which uses the digital signal processor TMS320F2812 and new digital signal controller device dsPIC30F6014A as core chip, and the complex programmable logic device as interface controller. This structure makes both measure and control function and phase-controlled switch function runs on proper hardware. In the hardware design, emphases anti-disturb and reliability design to reduce the affect of bad surroundings that switch works with. The power circuit, analog signal adjusting circuit, digital I/O interface circuit and watch dog circuit were all designed by this thought. And in the software design, the part of measure and control system planted uc/OS-II which is a multi-mission operation system with a real-time kernel on 2812 chip.
　　The real-time kernel manages all of the missions to work more effective and improves the real-time and reliability of the system. For more, the paper discussed http://www.chinamagnets.biz some changes to make the kernel works better in this system specially. On the other hand, in the software design of the part of phase-controlled switch, this paper introduces all aspects of the methods to realize phase-controlled switch technology in detail, Include sampling, FIR filter, communication between DSPs, system time scalar, zero-point gaining, action time of switch adjusting etc. Then it also does some helpful research of the reliability design of software, and uses some principles of it in this system’s software design.Though the simulation and experiment, the system was proved to be available and reliable, it achieved the target of designed. Some problems in software designing and debugging are summarized in this dissertation at last.

Research of Steady-state Permanent Magnet Actuator Improvement on 12kV Outdoor Vacuum Circuit Breaker

　　Research of Steady-state Permanent Magnet Actuator Improvement on 12kV Outdoor Vacuum Circuit Breaker
　　Permanent magnetism actuator is a new generation vacuum circuit breaker mechanism. It obtains general attention because of its less components, high reliability, non maintenance and good match of power feature and reaction feature. These merits are not analogous by traditional mechanism. Permanent magnetism actuator is widespread applied at medium voltage breaker field in the world.Research object in the paper is single steady-state permanent magnetism actuator of 12kV Alnico magnets outdoor vacuum circuit breaker which has been applied at state electric grid. Chief characteristic of this paper is that against to practice products to proceed to profound research. Through finding reason and settle scheme, practice problem is settled. Products can be more reliable, more stable and more perfect.In this paper, researching the single steady-state permanent magnetism actuator switching current and the manually switch-on program about 12kV outdoor vacuum circuit breaker, when the switching current is large, the aim is to reduce it.
　　Counterforce and dynamic feature of permanent magnetism actuator with two kinds of drive modes are calculated and analyzed, and then calculation result is verified by test. To Analyze switch current of two drive ways in order to find a drive way that lab saving to reduce the switch current. With the comparing analysis of the dynamic feature of permanent magnetism actuator in two drive way, adopting four-step Runge-Kutta and Newton iteration method to http://www.999magnet.com
 solute, through secondary development of ANSYS, using C and APDL language to compile program, dynamic feature calculation is realized. In manually switch-on, stored energy of switching on spring actuator is used to supply to switch on energy for permanent magnetism actuator, proposing two schemes, and settle the validity and feasibility by experiment.Large quantity test research is used to verify scheme during research course. In this paper, detailed description the switch on and switch off tests average switch on and switch off speed test and the interrupting test principle method, test method is discussed in this paper, generalizing problem and solving method during test.

Study on Irradiation Effect of FeCrCo and NdFeB Permanent Magnet Materials

　　Study on Irradiation Effect of FeCrCo and NdFeB Permanent Magnet Materials
　　Damage behaviors of FeCrCo alloy irradiated by neutrons and electrons and Damage behaviors of NdFeB permanent magnets irradiated by electrons and protons were studied systematically. Microstructures of these materials were studied by XRD, TEM. Defects induced by irradiation were studied by Positron Annihilation Life Spectroscope (PALS). Hyperfine structures of Segment neodymium magnets these alloys were studied by M?ssbauer spectroscope.Results of electrons irradiation experiments indicate that, magnetic flux of all 3 kinds of NdFeB alloys decreases obviously after electron irradiation, and the magnetic flux decreased with the increase of dose of electorn irradiation.
　　The decrease of magnetic flux of alloy N35 is the most remarkable, alloy N53 is the next, and N35EH is the most inapparent. NdFeB magnets with high coercivity and high magnetic energy products have strong irradiation resistance. Magenetic flux of FeCrCo nearly does not attenuation after electron irradiation. The investigation results of XRD and PALS show that the crystal structure and defects do not change after electorn irradiation. Magnetic flux of FeCrCo alloy and NdFeB alloy irradiated by electrons shows reversible changes.The decrease of magnetic flux of N35EH and N53 alloy are especially remarkable after proton irradiation. Results of XRD and PALS http://www.999magnet.com experiments indicate that the crystal structure and vacancy defects do not change. Magnetic flux revert completely after charge magnetism. Proton irradiation don’t induce the change in structure of the materials. The nucleation and growth of reversal domain induced by irradiation is thought to be the main reason that causes the demagnetization of NdFeB magnets.The loss of magnetic flux of FeCrCo alloy after neutron is remarkable. The changes in coercivity are small, but the residual magnetization and the magnetic induction shows obvious irreversible loss. The results of TEM and XRD analysis indicate that irradiation lead to diffusion of alloy elements, although the crystal structure does not change. PALS studies show that vacancy cluster increases by neutron irradiation. M?ssbauer spectroscopy analysis indicates that the part of paramagnetic phase decreases while ferromagnetic phase increses, and hyperfine magnetic field shifts to higher field after irradiation.

Research on the DSP-based Driving Technology of the AC Permanent Magnetic Synchronous Linear Motors

　　Research on the DSP-based Driving Technology of the AC Permanent Magnetic Synchronous Linear Motors
　　Compared with common servo driving mechanism, linear motors have lots of advantages in fast response and precision, because it could convert electrical energy into linear motion directly. Using linear motor servo driving system is a new development direction of high speed precision machines. At present, researching on linear motors and its servo driving technologies Neodymium Magnets has become an academic focus.Firstly, the general structure and basic working principle of Permanent-Magnet Synchronous Linear Motor (PMSLM) are introduced in this paper.
　　According to the operation principles of DSP (Digital Signal Processor) and IPM (Intelligent Power Modules), an overall design scheme for PMSLM is proposed.Because the main point of this paper is about linear motors’driving technology, a printed circuit board including several function modules is designed. The whole driving system’s security and reliability are enhanced by the protective circuits for the main circuit on the board. Interface circuits for DSP and IPM are designed according to their inner operational principles. Based on AT89C52, display module for linear http://www.999magnet.com motor’s parameters is developed and the communication between AT89C52 and DSP is implemented. During the process of experiment and board designing, series of measures are introduced to avoid noise. In order to meet the requirement of PMSLM servo driving system, a multi-output single-chip switching power supply is developed using TOP223Y as a pulse width modulation chip. After analyzing the TOP223Y’s operational principle, a high frequency transformer and the whole power supply circuit are designed. In the meantime, this paper also discussed how to reduce ripple voltage.Finally, some experiments are carried out to verify the performance of the developed driving system.The experimental results include velocity and ripple voltage test of auxiliary switching power supply.

Design of Permanent Magnetic BLDC Control System Based on Infineon XC167CI MCU

　　Design of Permanent Magnetic BLDC Control System Based on Infineon XC167CI MCU
　　Permanent magnetic brushless DC motor is a high-tech production with mechanical, electrical and electronic technology, and has the specialties of simple structure, reliable running and long useful life and is used widely in the industry. With the rapid development of modern industry, the requirement to the performance of BLDCM control system is more and more high. Ball Neodymium Magnets So, it is very significant to research such a control system with quick response, powerful regulation capability and high precision.This essay introduces the components of a whole BLDCM control system and its research direction, INFINEON XC167CI 16-bit high performance MCU, and types of BLDCM. Then, analyses the running principle of BLDCM, builds mathematical model, expatiates the torque-ripple and how to lighten it in detail.In this essay, dual closed loop BLDCM control system based on INFINEON XC167CI MCU is designed and implemented. The BLDCM is controlled by PWM mode. The control system with dual closed loop digital PI regulators has good performances in http://www.chinamagnets.biz dynamic and static states. The serial communication between INFINEON XC167CI MCU and LCD display and keyboard setting module makes it possible that the information of the control system can be transmitted between control system and people, which gives convenience for the debugging of the control system, and makes the parameters of the control system displayed real-time.In the end of this essay, analyses the result of experiments based on the waveform collected, and summarized and expected the control system designed and implemented in this essay.From this essay, we can tell that the INFINEON XC167CI MCU has very high performance, and the control system based on it also works reliably. The result of the experiments shows the proposed control solution is feasible, which provides the basis and useful reference for later research.

Development of the Design and Dynamic Analysis Software for Permanent Magnetic Actuator

　　Development of the Design and Dynamic Analysis Software for Permanent Magnetic Actuator
　　Permanent magnetic (PM) actuator is extensively used on vacuum circuit breaker (VCB) because of its simple structure and high reliability. In order to avoid repeating research design and meet the demand of corporations in new product development, a design and dynamic analysis software of PM actuator for 12kV, 40.5kV and 72.5kV VCB is developed in this paper.neodymium magnets The design and dynamic analysis software of PM actuator in this paper adopts the idea of modular, using the Visual Basic program design language to develop a human-computer interaction interface with simple operation and full functions, applying windows pull down type menu and mouse shortcut menu for the operation of producing users. The software uses the automatic connection and loading to realize the relevant functions, they are: 1. The module of design calculation.
　　This module design the parameters of the PM actuator according the design constraint parameters given by producing users, and then send the design result to the data sharing module which is used for being called by other modules and viewing by users. 2. The module of electromagnetic field calculation and dynamic analysis. This module uses the Runge-Kutta method to solve the system of equations of magnetic field and mechanical movement, dynamic analysis of PM actuator is realized, and the simulate curve is drew according the dynamic result by Visual Basic, which http://www.chinamagnets.biz makes the result much more clear and visualized. 3. The module of design result output. This module uses the parameterization graphical picture drawing language AutoLisp to develop a plotting program of each components and general assembly design papers, which reduces the process of drawing work, the software drawing through AutoCAD and automatic loading plotting program. 4. The module of magnetic field analysis. This module can show the magnetic field calculation result to users by graphical display. 5. The module of control system. This module can show the contactor control schematic diagram and the electronic control circuit schematic diagram, printed circuit board drawing and element list. In addition, this software include help document, which is used to solve the users’ technical problems in the process of setting up and using. At last, a PM actuatorfor 12kV VCB is designed using this software, the testing of this VCB with PM actuator is done, the result of the testing show that the capability of the VCB meet a demand, which prove the correctness and practicality of this software.

Research on Electric Golf Cart’s Permanent Magnet Brushless D.C. Machine Driving System

　　Research on Electric Golf Cart’s Permanent Magnet Brushless D.C. Machine Driving System
　　Under the background of increasing oil resources shortage, how to reduce traffic dependence on the non-recyclable oil resources and the pressure on the environment, and how to develop electric traffic especially Electric Vehicles (EV) have become major international issues. During this time, from Light Electric Vehicle (LEV) to Compact Electric Vehicle (CEV), China’s electric traffic works out of its own new path.This paper aims at the study on the electric golf cart’s neodymium magnets driving system via specific project against this background, the electric golf cart has some performance indices very closed to compact electric vehicle but it is more lightweight. Researches On the key issues of the development of electric vehicle driving system such as the selection of motors, the construction of driving system, control strategy of driving system, regenerative braking, etc. are applied to practice in the driving system controller.After the comparison of various types of motor, we choose permanent magnet brushless DC motor (BLDCM) as driving motor of the system. And I carry out a detailed analysis and study on the application in driving system about some of the common and specific characteristics of BLDCM. This characteristics include: (1) Sum up the six series of common modulation strategies of BLDCM and finalized a simple H- PWM -L- ON modulation strategy to achieve motor’s speed regulation;
　　(2) Introduce on the three electric braking patterns, analyze low speed regenerative braking theoretically and give the switching mode of the main circuit power semiconductor devices; (3) Study on the commonly used torque control strategy in detail and point out that the torque control strategy has deficiency of highly nonlinear driving response in the region of weak magnetic and leads to "closed-loop failure" when the load torque is unable to reach the given torque corresponding to the position of accelerator pedal, then produce a“the greatest torque control strategy" to http://www.chinamagnets.biz resolve the "closed-loop failure" and achieve good effectiveness in practice.This paper analyze the subsystems’model related with driving system such as vehicular dynamics, BLDC motor, motor control systems and lead-acid battery. In the Saber platform, around the drive system, I build a specific model of main circuit of the voltage source inverter (VSI), convert the running resistance of vehicles to rotation resistance of motor, simplify the lead-acid battery model, and establish the digital PID model in Z domain in order to reflect the implementation of the control strategy in truth. Simulation analysis can find the latent problems of the system before the physical design and simulation results can also be used to guide the design of the actual system.Based on the previous scheme demonstration, theoretical and simulation analysis, I carry out the product design of electric golf cart’s driving system: A controller based on the dsPIC30F4011 including the design of hardware and software’s programming and debugging work, I introduce a series of innovative achievements and products in the hardware design. At last, I verify the final performance of the control system in a series of test.

A Control System Design of Permanent Magnet Synchronouse Machine Based on DSP

　　A Control System Design of Permanent Magnet Synchronouse Machine Based on DSP
　　The Purpose of this paper is design a good performance, high regulation ratio control system of Permanent Magnet Synchronous Machine (PMSM). To achieve this, some control arithmetic for improving the precision and performance are studied and the designing of hardware and software of system is researched.Comparing to the servo motor, the machine used as a spindle not only must have the performance of high speed, short starting time, little fluctuation neodymium magnets of speed, big torque and power, but also has to have a wide speed regulation range. It can run in high speed perfectly, and also run in low speed with as large as possible torque outputting. To achieve this, field-weakening control is used in this paper.The hardware designing contains four parts, which are main circuit designing, control system designing, drive system designing and some protection circuit designing, all of these compose the integrated whole which provide a solid base for the control system.Based on the hardware, PI arithmetic is used to modulate the speed and current vector, flux-weakening arithmetic is used to control the excitated current of the rotor and the space vector arithmetic is also used to create the SVPWM, which makes the IPM produce alternating voltage serial which makes the http://www.chinamagnets.biz motor run. The vector control arithmetic is proved correct by the simulation of Matlab.It is easer to program by using the TMS320LF2407A which is of excellent capability of operation and fast real-time processing to achieve the complex control arithmetic and it also can implement the excellent performance control motor. This system in this paper is a foundation to research the better speed-modulation system of AC motor.Finally, the hardware and software of this system are proved correct by experiments, they can control the speed accurately and elevate the speed of motor effectively, all of these make a foundation for the further research.

Development of the Phase Selection Controller for Parallel Compensation Permanent Magnetic Mechanism Circuit Breaker

　　Development of the Phase Selection Controller for Parallel Compensation Permanent Magnetic Mechanism Circuit Breaker
　　Along with the development of distribution automation system, more requests have raised in the reactive balance. As the terminating equipment in the power system, the reliability and the intelligent level of the circuit breaker affect the stability and automatization Ball Neodymium Magnets of the power system.At first, the paper introduces the principle of the controller’s design, and then put forward the microcomputer mode for realizing the permanent magnetic actuator control. And it analyses the equipment of Reactive Compensation in general use at present. It rased an intelligent synchronize controller based on monostable permanent magnetic and GSM technology.The design makes microcontroller PIC16F877A of Microchip Corporation as central processor. The hard platform mainly includes peripheral interface circuit, analog signals sampling module, communication module, power module and structure driving module.
　　According to the characteristic of permanent magnetic actuator in vacuum circuit breaker, it designs the circuit for driving the actuator to close and measuring the voltage of capacitance linearly. In software, it applied in Single Chip Micyoco C language, in http://www.chinamagnets.biz order to convenient the software compile and upgrade in future. And it compiles the application software including drive the actuator to close or open, electric parameter sampling, the algorithm of line selection and communication. At the same time, it gives the steps of resolution on reliability.At last, the paper designs the experiment scheme to validate the main function of the drive, fault line selection and GSM communication, then analyses and compares the result.The paper is completed in hardware circuit, emulation, the correlative programmer and arithmetic and debug. The controller realizes the main function in design. The research and experiment result proves that: the design structure of controller is reasonable and modularized, to satisfy the technology request. It has well reliability and practical.

The Study of Permanent Magnet Brushless DC Motor for Machine ARM Joint

　　The Study of Permanent Magnet Brushless DC Motor for Machine ARM Joint
　　Along with the progress of capacity control and robot technology, machine arms, which are not so easy to be effected by the environment, easy operated, have taken place of human in more and more field. Recently, it makes more and more progress in this field. The motor used in the joint of machine arm is always the point in the research of machine arm field. The neodymium magnets choice of the motor and relative method of control has more or less effect on the cost, operating precision and the reliable of the arm. Among all the motors that can be used in the joints, Brushless DC motor (BLDCM), which has advantages as low cost, light quality and high reliable etc., has taken more and more attentions. In this paper, we analysis the characters of BLDCM according to environment and its structures.At first, the designing index and principle of the BLDCM and its controlling system is presented. And the mathematic model also has been set up.Secondly, the whole FEM analysis model of static and transient operating are made, and the data of electromagnetism has been. The calculation has taken the saturation into account.
　　Thirdly, by using FEM, we can design the http://www.chinamagnets.biz motor more effectively. Experiment and analysis results show that BLDCM has high power-density, high T-n character and can complete the work of machine arms. It is so valuable that can optimize the motor’s structure and the load capability.At last, for being high power density, the thermal load of BLDCM is also higher. So more attention must be paid to the temperature rising. In this paper we use FEM 3D software to analysis the thermal field of the motor. And we get the temperature distribution and temperature rise process when the motor is on static or transient operating. Through block experiments at vacuum and normal statement ,we get that if we deal with the time and load of BLDCM well, machine arm would operate more safe and reliable.

Sensorless Control of Surface-Mounted Permanent Magnet Synchronous Motor Based on Sliding-Mode Observer

　　Sensorless Control of Surface-Mounted Permanent Magnet Synchronous Motor Based on Sliding-Mode Observer
　　This thesis presents an approach to sensorless vector control system of permanent magnet synchronous motor (PMSM) using sliding-mode observer.First of all, mathematical models of PMSM are set up. Afterwards, the theory of sliding-mode observer is analyzed in details. The nonlinear equations of motor driver are linearized using αβ reference frame. Real-time online estimation of motor rotor position and speed of PMSM is conducted utilizing sliding-mode observer. Neodymium Magnets To obtain the rotor position and speed, it is sufficient that the terminal voltage and phase current of motor are known according to the model of motor driver. It is not influence on the performance of control that the d- and q-axis current components are estimated to feed back at the same time,
　　which is an important character of the sliding-mode observer. The observer shows that the time-delay, in rotor position estimation, does not have influence on the vector control when the d- and q-axis current components are accurately estimated. The d- and q-axis current components are accurately estimated when the estimated e.m.f. and current space vectors have the same delay as to the actual ones. The PI controllers, fed by the actual d- and q-axis current errors, generate the correct voltage references in the estimated rotor reference frame. The coordinate transformation needs the estimated rotor position with no correction. To obtain accurate estimates of the d- and q-axis current components, it is sufficient that the estimated e.m.f. and current space vectors have the same delay with the actual ones. An adaptive sliding-mode observer, with low-pass filter, is used to estimate the e.m.f. space vector, and a similar low-pass filter to delay the current space vector. The rotor speed and position are http://www.999magnet.com obtained from the estimated e.m.f. space vector and its derivative. The simulation in the environment of Matlab shows that this method has good motor rotor position tracking performance and rather good speed tracking performance. Moreover, the ability of anti-disturbance of load is the remarkable feature of this system, and the controlling performance is pretty good. It is shown this method makes it.In addition, the realization of control system needs PWM wave, which is generated by SVPWM. Its theory is explained in detail, and SVPWM simulation model is set up as a part of control system. Simulation results are presented to prove the exactness and effectiveness of the modulation approach.At last, by the experiment of the hardware and software system designed it is shown that DSP has fast calculating capacities. DSP can implement all complex arithmetic in real time.

Temperature Field Analysis for the Main Permanent Magnet of MRI

　　Temperature Field Analysis for the Main Permanent Magnet of MRI
　　Among the many methods of medical imaging, magnetic resonance imagine (MRI) is characterized for high resolution of tissues and clearity of dissection structure. H proton in human body can be detected and imaged by MRI, therefore, it is an important instrument for the doctor to diagnose before disease gets worsened. Made of Nd-Fe-B material, main magnet is the Neodymium Magnets biggest, heaviest and most expensive part of MRI device. Its stability of main magnet field is directly influenced by the stability of temperature, which is influential to the quality of image. Thus, the control of the temperature of main magnet is needed.An open and permanent MRI system is discussed in this paper.
　　During the control of temperature of main magnet, problems like uneven distribution and huge fluctuation of temperature and over heating time is encountered. Presently, control technology of domestic products is based on the experienced judgement. Due to the lack of scientific analysis, it is hard to be improved. Internationally, the temperature control technology is kept by MRI makers as a secret because of commerce interest.To control the temperature field of the main magnet system of open-permanent-magnet MRI device, so as to make temperature field reach the required value and uniformity, the ANSYS software is used to solve the 3D-transient temperature field of MRI device on the basis of energy conservation law and equation of thermal balance. The emphasis is on the analysis of the variation of the temperature field in two yokes and supporting posts. The path along which http://www.999magnet.com the heat is transmitted is researched and found.Several improvement schemes are presented in this paper. To compare the time that is taken for the energy emitting through the steel structure in different heater arrangement, the finite element analysis is implemented. Appropriate point is selected as the representative of average temperature of the main magnet which is feedback for temperature control. The different schemes are given to reduce the heating time and to promote the homogeneity of the resultant temperature field. The problem of un-uniformly temperature distribution between the upper- and lower magnets is solved by the methods proposed in this paper. To program the process with APDL language supplied by ANSYS, modeling is predigested with great efficiency and speed.

Study on Pole Position Detection Technique of PMSM

　　Study on Pole Position Detection Technique of PMSM
　　Permanent Magnet Synchronous Motors (PMSM) have been widely used in high performance speed regulated system for their advantages, such as high power density, high efficiency. In conventional PMSM driving system, to realize high performance control, the position sensors (such as resolvers, optical encoders) are needed to get the pole’s position and velocity. These Ball Neodymium Magnets additional position sensors not only increase the cost of the system but also decrease the system’s reliability. The problems of the position sensors limit the PMSM in some special application.
　　In order to reduce the cost of the PMSM driving system, the paper has proposed two pole position detection techniques, the technique based on two quadrature locked Hall Effect position sensors and the technique based on the sliding mode observer (SMO), for different applications.Firstly, on the basis of analyzing the mathematical model and vector control principle of PMSM, the two position estimation techniques have been researched. Secondly, the position estimation technique based on two quadrature locked Hall Effect position sensors and the possibly estimation error in the technique have been discussed in detail. A compensation method with the consideration of motor acceleration has been proposed to get a high accuracy position. Based on the position estimation technique, the Pseudo-sensorless PMSM controller has been designed. The position estimation technique is http://www.chinamagnets.biz tested on the controller and the experiments results show the correctness of the technique.Finally, the position and velocity estimation techniques based on SMO have been discussed in detail. The impact of the SMO chattering is considered for position and velocity estimation and some feasible measures are proposed to improve it, i.e. the FIR filter method, the saturation function method and the Extended Kalman Filter method. The position and velocity estimation techniques based on SMO are tested on the simulation model for sensorless vector control system of PMSM and the experimental platform based on TMS320LF2407A DSP. The experimental results agree well with the simulation results, and the results have verified the correctness and availableness of the technique.

新型横向磁通永磁电机的研究

　　新型横向磁通永磁电机的研究
　　Professor Weh, from TU Braunschweig of Germany, presented transverse-flux motor topology concept in 1980s, which is significant to improve the torque density of the motor. In the middle of 1990s, with the rapid development of the relevant theory, analysis method and the materials, the transverse flux motor gradually became research hotspot. Much attention is neodymium magnets focus upon on the transverse flux permanent magnet motor (TFPM) which efficiently combines the advantages of the transverse flux motor with the high torque density and the permanent magnet motor with the high efficiency.The research of this paper is about the transverse flux permanent magnet synchronous motor that is part of the national 863 program entitled "design and integration techniques of new types of permanent magnet motors"(research code: 2002AA324020). The aim of this paper is to bring the advantage of high torque density and high power density into full play and overcome the disadvantage of low power factor.
　　Analyze and calculate the magnetic field of the transverse flux permanent magnet synchronous motor. Try to find out the reason of low power factor and bring forward the suggestion and corresponding method of improvement. Based on the above analysis a sample motor is made to testify the theory achievement trying to get better performance and technique target.In Chapter 1 the target and significance of the research on TFPM are presented, and the research level on this field at home and abroad is also given.In Chapter 2 the fundamental theory and characteristics of the TFPM are http://www.chinamagnets.biz explained. The transverse flux motors are categorized into different kinds.The 3D FEM is very efficient and contemporary approach to an accurate computation of electromagnetic field, but the whole motor model is too complex and time-consuming. In Chapter 3, in order to reduce calculation time, only one of 20 pairs of poles model is analyzed. Based on the magnetic field calculation some parameters of the sample motor such as electromotive force with no load, leakage coefficient with no load and magnetic torque are calculated and influence on the performance by the change of the structure of the sample motor is also discussed.In Chapter 4, a new prototype TFPM is produced. The novel structure of the prototype TFPM will be described. Part of the prototype TFPM parameters will be shown.In Chapter 5, a preliminary practicality computer aided design(CAD) software is accomplished based on both Visual Basic and ANSYS, which can be used to optimize TFPM design. And more motors with better performance will be produced.