Optimization of Motor Design and Control System of Bearingless Slice Motors

　　Optimization of Motor Design and Control System of Bearingless Slice Motors
　　The bearingless slice motor (BSM) is a new-type electrical machinery, which can completely suspend at 5 DOF. It utilizes the bearingless technology to realize radial suspension, and can be levitated passively by the magnetic force at the same time. For its advantages like non-abrasion, robustness, simple structure, hermetical, and so on, the BSM has unique application superiority in the fields of ultra-pure driving, such as medical equipment, chemical industry, nuclear waste material, etc.In the case of eccentricity, the mathematical model of the BSM is discussed in this paper, neodymium standard state which is helpful for solving the problem of confirming the central position of the rotor. The mathematical model provides theoretic foundation for the control system design.
　　The finite element analysis (FEA) software, ANSYS, is adopted to analyze the radial force and torque. The simulative results validate the validity of the mathematical model with the rotor having radial displacements.In the aspect of motor design, two optimize methods of designing the permanent magnet shape, which aim at parallel and radial magnetization respectively, are introduced in detail. Compared with the conventional surface-mounted permanent magnet type, the new shape can produce sine air-gap flux density and thus alleviate the overtone content. The simulative results and the experimental results prove the feasibility of the optimize methods. Also, the methods make reference to the permanent magnet design, which can produce other forms of air-gap flux density http://www.999magnet.com/products/112-neodymium-standard-state like rectangle and trapezium. Moreover, the research on electromagnetic simulative analysis of the axial force and torsion is beneficial to improve the motor design and the in-depth study on passive suspension.Based on the mathematic model of eccentricity and the electromagnetic simulative analysis above, this paper also studies on the digital control software system with———————— TMS320F2812 DSP. The subprograms are modularized, which can predigest the codes length and save the memory space. Applied to a BSM adopted optimized permanent magnet, the software system codes are designed, compiled and debugged. The experimental results indicate that the motor can be suspended and rotated successfully.

Research on Generalized Predict Control of PMSM with Constraints

　　Research on Generalized Predict Control of PMSM with Constraints
　　High quality requirement of servo system is raised with the development of industry and extensive application of servo system. The mature control strategies of Permanent - Magnetic AC Servo - Mechanism, such as Vector Control and Torque Direct Control, are effective and successfully applied in process industry. Alone with the development of computer technology and the further study on control theory, researchers pay more attention to Intelligent Control Strategy. Predict control algorithm which is suitable for computer realization, shows a great vitality and has been applied in process industry because of its robustness and low request to precise model.Permanent Alnico Magnets Magnet Synchronous Motor(PMSM) is a nonlinear system with significant coupling.
　　Traditional PID control may probably cause decline of dynamic performance when the load or parameters change, which is unavoidable in practical, so a robust controller is needed. Meanwhile, the performance index, which can be achieved best by adjusting properties to certain limitation, must be taken into account,thus it is necessary to make further research on constrained Generalized Predict Control(GPC). This paper takes the PMSM as a research object. First, its methematics models in several coordinate are set up based on the analysis of electromagnetism restricted relation. http://www.999magnet.com/products/108-alnico-magnets Then, vector control method of PMSM is presented, in the same time, PWM technology based on current comparing to selecting space voltage vector and predictive control technology used in speed-loop is presented in detail. As for Single Input Single Output (SISO) System Controlled auto-regressive intergrated moving average (CARIMA) model is setup in the rotor’s reference frame. Combining feedback mechanism of PID and predict mechanism of GPC, an improved model GPC algorithm is proposed, and as a result, the performance is improved by inhibiting the overshoot. Constrained optimization is added to performance index on basis of matrix decomposition. Finally, the experiment result shows the effectiveness of the proposed control algorithm.

Study on High Performance Filtering Driving Mechanism

　　Study on High Performance Filtering Driving Mechanism
　　Driving mechanism is a basic part whose accuracy, reliability, weight, size will directly affect the performance of electromechanical equipments. This research is one part of the Project“High performance frictional pairs and effective transmission mechanism technology in space environment”, which is supported by Subject of prepare study for civil aerospace of COSTIND during“Eleventh Five”(Authorized Number: C4220061319). Aiming at the problem existed in harmonic reducer and RV reducer that used in robot, aviation, aerospace etc. under the Neodymium Magnets special and extreme environment, professor Wang Jiaxu and others from Chongqing university proposed a new high performance filtering driving mechanism with high reliability, long service life, high precision, large torque, high efficiency, small volume and lightweight, which integrated nano-surface engineering, filtering transmission, permanent magnetic brushless DC motor, precision transmission and solid lubricate, and we develops prototype.
　　The major research is listed as follows:①Taking filtering mechanism as core component, then integrating the angle sensor and permanent magnetic brushless DC motor, the integration structure assemble drawings is designed, and then some analysis on the principle of filtering driving mechanism, DC motor and angle sensor are made. At last, the high performance realization methods of filtering driving mechanism are proposed, and optimum design on filtering transmission mechanism speed and motor parameters are also made;②The transmission principle of filtering transmission mechanism is analyzed. Parameter optimization and structure design of filtering transmission http://www.999magnet.com/products/110-sintered-neodymium-magnets mechanism are done. Integrated eccentric shaft with dual gear is defined as bearing-gear. Then, the gear strength is also calculated;③General structure design of bearing-gear has been done on the basis of the optimization of main parameters on bearing-gear. Then, the contact stress of bearing-gear is analyzed on the basis of Hertz theories, including calculation formula’s deducing and example’s calculating. After that, some study on the capacity load is made. At last, the friction moment of the bearing-gear is calculated and the material selection of bearing-gear is carried out;④The theories analysis and numerical calculation towards filtering gear transmission error and backlash error are done. Basic structure and methods that reduces backlash error are analyzed;⑤Testing methods and technical requirements of filtering driving mechanism are analyzed, high performance precision transmission testing bed is also developed. The experimental research such as transmission efficiency, rigidity and noise of filtering transmission mechanism are done.

Based on SERCOS Electric Pitch Servo System of Position Control

　　Based on SERCOS Electric Pitch Servo System of Position Control
　　The energy and the environment are the urgent problem which now the human survival and the development must solve. Now various countries have attached important to full use of wind energy and control technologies of wind turbine generator have rapidly developed. Be changed into the pitch that system is already regarded highly by everybody among them, especially electric pitch servo control system technology. The system structure having brought forward electric pitch servo system, has structured the main body of that based on SERCOS is changed into pitch servo control system soft and hardware experiment platform. Basically, it has realized real-time control servo system function and comparatively satisfied controlling effect.The wind turbine has Alnico Magnets been introduced into two kind of pitch realizing way: Hydromantic pitch and electric drive. It priority has been analyzed electric pitch servo system and servo motor. Proceed to have built the simulated servo system model taking three-phase permanent magnetism synchronous motor as servo motor owing to Matlab/Simulink .It has been the analysis having discussed that the vector control mode is servo motor under the control of tactics and in progress to whose simulated result specifically for three-phase permanent magnetism synchronous motor function characteristic.The final theory feasibility for electric pitch servo system, be changed into pitch servo control system combining with electric getting up, building based on SERCOS open digital control system and electric pitch that servo system is organic. In this paper, software is programmed with http://www.999magnet.com/products/108-alnico-magnets VC in Windows embedded RTX, shared memory is created for communication between two process, multithread is created for multitask. In the servo system closed cycle no-load experiment, it has been carried out analysis on experiment result. So result indicates system respond to the servo controls quickly and has fine dynamic real-time. It has verified system design plan feasibility and establishes a basis for to studying further.

Sliding Mode Control for PMLSM Based on Singular Perturbation

　　Sliding Mode Control for PMLSM Based on Singular Perturbation
　　Owing to the permanent magnet linear synchronous motor(PMLSM) possessing the trait of high response, high rigidity, high precision and etc, it has been subjected to apply to occasions of high speed, hypervelocity and precision machining and etc, and the study of the control strategy for PMLSM has been subjected to concern. The coupling between variables, parameter uncertainty, load disturbance and end effect consisting in the PMLSM servo Ball Neodymium Magnets system make precise control complex problem. The sliding mode controller containing flat sliding mode switching laws based on singular perturbation for PMLSM is designed based on embedded studying parameter perturbation, external disturbance and coupling relationship consisting in mechanical and electrical variables in the PMLSM servo system.
　　For resolving the nonlinear variable coupling of the PMLSM, singular perturbation theory is dealt with coupling between velocity and current. To the problem of parameter uncertainty and external disturbance, the sliding mode control method is adopted, and the flat sliding mode switching laws is brought to PMLSM servo system to weaken buffeting phenomenon attributing to the sliding mode control.Owing to PMLSM servo system having characteristics of multiple time scales, the coupling between variables and nonlinear problem in PMLSM servo system is resolved by the sliding mode theory combining with the singular perturbation theory, complicated degree in course of design controller is reduced, and has high robustness for uncertain parameter perturbation and external http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php disturbance. There are quasi steady state method and block diagonalizable method in singular perturbation theory, and the former resolves the system which time scale difference is small and the latter resolves the system which scale difference is big. First, the system is decomposed two different time scale subsystems by two methods respectively, then continuously differentiable sliding mode controller is used to design control laws for slow subsystem and fast subsystem, and two control laws of subsystems are combined the compound controller of PMLSM at last. Simulation results show that double sliding mode controllers containing flat sliding mode switching laws make PMLSM servo system possess fast dynamic response and the system has high robustness for parameter perturbation and external disturbance.

Stator Design and Loss Calculation for High Speed PM Generator

　　Stator Design and Loss Calculation for High Speed PM Generator
　　The high speed permanent magnet (PM) machine has been widely investigated since it has high speed, small size, high efficiency and power density. The application areas for this machine include compressor, energy storage flywheel, distributed power generation and so on. Distributed power generation takes pressure off electric transmission infrastructure and has benefits, such as low emissions, fuel flexibility and high efficiency.In this paper, the Block neodymium magnet structure design characteristics of high speed PM machine are analyzed. Due to the high rotor speed and high frequency of the stator flux variation, it is quite different from designing a conventional machine in high speed machine design and loss calculation and thermal analysis. There are many problems need to be researched on stator, rotor and bearing.
　　For a high speed PM machine, this paper will pay attention to study the stator key problems such as the design of stator core and stator winding, choice of polar, calculation of loss and temperature.A comparative study on the influence of different stator structures on machine performance for a same PM rotor is carried out based on the magnetic field analysis. The influence of different winding modes and different polar numbers on machine performance is also studied respectively, and their advantages and disadvantages are compared.The magnetic field analytical method of PM generator based on ANSYS is studied. For generator, a circuit-field coupled finite element method need be used. In this paper, the current iteration method is used to analyze the dynamic http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php operation of high speed PM generator based on ANSYS programs, and the results will be processed by MATLAB.Because of the influence of the high frequency, the iron loss calculation method of traditional machine is not appropriate for high speed machine, and the material parameters have changed. Three single phase transformers which have different modes have been manufactured. The BH curve and loss coefficient in 400Hz are measured by experiment.The influence of anisotropic material is also studied.An important problem is to ensure that the rotor never reaches a temperature, which would demagnetize the magnets. The high speed generator which has 6 slots and uses ring type winding is manufactured, and for the generator, the preparatory temperature of stator is calculated.

飞轮驱动装置的控制系统设计

　　飞轮驱动装置的控制系统设计
　　This dissertation is originated from the technology of High Temperature Superconductivity Flywheel Energy Storage. This system uses Permanent Magnetism Synchronous Machine (PMSM) as its driving motor and requires achieving motor speed and current closed loop control, with the design of control system. This dissertation has conducted systematic research based on the control system of Flywheel Energy Storage System (FESS).The main content is as follows:1. Briefly introduces the research background and the significance of FESS, the development and application prospects of FESS and PMSM, and the basic principles of FESS.2. Elaborates the basic principles, the components, the operating characteristics, the state equations and the transfer Neodymium Magnets functions of PMSM.3. According to the control requirements of FESS, XC167CI MIC is adopted to control PMSM. On the basis of the features of PMSM and the functions of XC167CI MIC, proposes the practical program of closed loop control of Servo System using XC166 technology, and achieved simulation based on Space Vector Pulse Width Modulation (SVPWM) strategy with a favorable result. Then the software and hardware design have been made detailed elaboration on the basis of the designed controlled plan and algorithm. On the hardware part, the overall design is followed by the circuit design of several key modules; and on the software part, the idea of blocking design is adopted, draws flow charts of every blocking, issues on sofeware implement is discussed. Finally, the control system is actually http://www.999magnet.com/products/110-sintered-neodymium-magnets running experimentally, and the test results were analyzed.4 The results show that the simulation reveals that the program is entirely feasible, the designed hardware and software system operates normally, fulfills the functions of serve control system of a PMSM, provids sound bases for the further research of High Temperature Superconductivity Flywheel Energy Storage machines.

Robust Controller Design for Linear Feeding System Based on L2 Gain

　　Robust Controller Design for Linear Feeding System Based on L2 Gain
　　Linear feeding system cancels all the middle transmission links from the motor to the worktable and makes the transmission links of feeding system zero."Zero-transmission" of feeding system has been obtained,which makes linear servo motor drive system apply widely in many aspects.Disturbance is the main factor which makes system servo performances decline.To improve the servo performance and obtain the fine work quality of the system,the disturbances must be attenuated.By adopting a L2 robust controller whose structure and parameters neodymium standard state are fixed,the control method can guarantee that the performance requirements are met when the uncertainties seriously influence on the drive system.
　　In this paper,the L2 gain nonlinear robust control method is applied in linear alternating current(AC) servo system and further researched.At first,based on reading many domestic and international relative literatures the improvements of linear feeding system are overviewed;the domestic and international research status of permanent magnet linear synchronous motor(PMLSM) feeding system robust control are outlined;the control schemes of PMLSM servo system are described. Secondly,based on the analyzing the basic structure and work principle of PMLSM,the vector control principle is introduced;the mathematic model of PMLSM is established;the influences of main disturbance factors of linear motor servo control system to the dynamic qualities are analyzed simply.Thirdly,basic theories of designing L2 gain robust controller are introduced,which include passivity,stability,L2 gain,HJI(Hamilton-Jacobi-Issacs) inequality,the back stepping method of designing storage http://www.999magnet.com/products/112-neodymium-standard-state function and robust performance designing rule of nonlinear system.Based on these theories and according to the trait of nonlinear mathematic model of PMLSM and the complex disturbance status,the L2 gain robust control method of PMLSM servo system is researched.According to the mathematic model of PMLSM,the L2 gain robust controller is designed,and the theory of describing L2 gain controller is obtained by constructing properly the storage function,and then it is proved that the L2 gain robust controller can satisfy the disturbance attenuation and asymptotic stability.At last,the simulation analysis is processed with the help of Simulink software in Matlab.The simulation results show that the L2 gain robust controller applied in PMLSM feeding system has strong robustness and strong attenuating ability for many disturbances,and satisfies precision processing requirements.

The Reserch and Design on the Sensorless BLDCM Controller Based on CAN Bus

　　The Reserch and Design on the Sensorless BLDCM Controller Based on CAN Bus
　　This paper focuses on the research and design of the sensorless permanent magnet brushless DC motor (BLDC) controller based on digital signal processor (DSP) and the speed control of CAN bus , and gives the design scheme based on DSP TMS320F2812 . The paper discusses sensorless control method of extend Kalman Filter for permanent magnet BLDC motors and gives a close-loop speed control solution both based on stator current and rotor Alnico Magnets speed feedback. In the solution , the node of CAN bus is realized by applying the integrated CAN bus controller of DSP TMS320F2812 .The paper summarizes the development of permanent magnet brushless DC motor and CAN bus , introduces the technic feather of CAN bus and the DSP TMS320F2812,and discusses the control strategy of sensorless permanent magnet brushless DC motor .Based on the control method of extended Kalman filter(EKF), the paper setups a mathematics model, and gives the terminal voltage detect circuit and the motor’s the curent detect circuit. In the paper , the algorithm which is proper to the sensorless control method of extended Kalman filter for permanent magnet BLDC http://www.999magnet.com/products/108-alnico-magnets motors is studied, and the corresponding program’s flow charts are offered. The paper gives the design of the CAN bus node of BLDCM control system, which includes the circuits and programs design. AT last , the paper gives an analysis of the control system.

车用发电机的节能与多电压问题研究

　　车用发电机的节能与多电压问题研究
　　Internal-combustion engine in which fuel is burned within the cylinder can transform the heat energy into the mechanical energy by the gas took the actuating medium. A transform job cycle includes air admission, compression, acting and exhausts four processes. The experiment indicated that only 20%-45% heat energy the fuel burns out in the engine transforms as the useful work, other heat energy discharges from the engine along with the cooling medium, the waste gas and so on. The energy loss also includes the internal transmission process loss that include the friction loss of the moving parts, the actuation loss of affiliated organization (timing mechanism, ventilator, water pump, oil pump, generator and so on) and loss for pumping waste gas. According to Neodymium Magnets present trend of automobile industry and energy consumption standard, energy reserves in earth only can support 50 years, therefore engine’s energy efficiency is a key issue which the current automobile industry faces in the world. As engine’s main appendage, the generator consumes engine’s output. In other words, it is an important step for the engine energy conservation to research on generator’s energy conservation.Aim at above problem, the energy conservation and the multi-voltage question with the generator are explored in the thesis. In order to enhance the power supply efficiency and avoid fierce impact which the electrical power system comprehensive promotion impose on the electrical system, the thesis regulate the generator to export the 14V/42V two kind of voltages, but the accumulator cell still exports the traditional 12V voltage. 12V accumulator cells are used to provide energy for starter, firing system when the automobile starts, 14V of generator is used for some traditional electrical device and charging for accumulator cell in time, but 42V are used for some high-power electrical equipment.
　　In order to enhance efficiency, the generator also needs to add the heat dissipating arrangement, improve transmission device like belt pulley and uses the high-speed bearing and so on.The permanent-magnet generator needn’t the external energy to http://www.999magnet.com/products/110-sintered-neodymium-magnets maintain its magnetic field after it is completed, but also bring about controlling its magnetic field is extremely difficult from outside. Which caused the application for permanent-magnet generator to receive the enormous limit, this question appears the especially outstanding to the permanent-magnet generator for vehicle. Because the generator for vehicle changes rotational speed in the very wide range, it is expected to work normally under 1000-10000r/min even wider rotational speed scope. At same time the variation of load also imposes on output voltage of the generator. How realizes constant output voltage of the generator under the situation of width rotational speed scope and variation of load, is a key issue whether the permanent-magnet generator for vehicle can work perfectly in practice.The basic method of voltage adjust in this thesis is three -phase half-wave controlled bridge rectifier circuit be controlled single-Chip Microcomputer, the generator to output the 14V/42V two kind of voltages. Three thyristors of three -phase half-wave controlled bridge rectifier circuit be controlled single-Chip Microcomputer, it is according to basis circuit, sample examination circuit, comparison http://www.999magnet.com/products/110-sintered-neodymium-magnets circuit and protection circuit to control flip-flop circuit.Based on the study , this design decides to use the power 1.5 kW PM generator that is ensure to work within the speed range of 1000 - 10000 r/min and export 14 V and 42 V two kinds of constant direct current voltage. It can fulfil the demand of a most part of using electricity equipments and additional 42V using electricity equipments in current cars, so it is worthy of a certain popularization.

Hybrid Excitation Synchronous Machine and Its Start Techinque

　　Hybrid Excitation Synchronous Machine and Its Start Techinque
　　There are permanent magnets and field coils which are both exciting sources in hybrid excitation synchronous machine (HESM). It’s characterized by high power density and capability of regulating magnetic field. So it provides one new type of machine for aeronautic starter/generator system.The magnetic characteristic and starter controlling technique of a novel Tangential-set Magnet HESM(TM-HESM) are studied in this paper. Configuration and operating principle of the TM-HESM are firstly introduced. Then the magnetic field distribution and neodymium prices static-state characteristic of permanent magnet motor of the machine are analyzed by 2D FEM, and the principle of optimizing design is also presented. Its magnetic field and static-state characteristic are analyzed by 2D electric magnetic field finite element simulation. At the same time, the influence of flux barriers, air-gap length and width of permanent magnet on performance of the machine is studied. Characteristic and regulating range of magnetic field in TM-HESM are investigated by theoretic analysis and 3D FEM. and means of optimizing permanent magnet structure, restraining supersaturation of axial magnetic http://www.999magnet.com/products/142-neodymium-prices part way and optimizing length of extend parts of machine are given and validated. Finally closed phase current which continues flowing based on analysis of theories and simulation combined magnetic field and external circuit is studied, and PWM_on_PWM controlling method is applied to solve the problem during starting period.

Design of 2kW Servo System Based on IRMCK201 and Grey PID Control Algorithm Application

　　Design of 2kW Servo System Based on IRMCK201 and Grey PID Control Algorithm Application
　　Along with the endless development of modern industry, the servo system is applied widely in many systems, the higher performance of the servo system is required .The PMSM Servo system can achieve the performances of high accuracy, high dynamic performance, wide-scope speed regulated or position control, so the study of permanent magnetic synchronous motor system has become one of the key directions in the study of digital-controlled machine tool servo Cast Alnico Magnet system.This paper research on the digitization permanent magnetic synchronous motor servo driver starting with the analysis and deduction based on the mathematical model of permanent magnetic synchronous motor. Applied with the method of vector control, this paper design the ACR and ASR with PI control arithmetic, and position regulator with Grey PID control strategy. The simulation wave of this control strategy is presented based on Matlab.In this foundation, the author designs the digital servo system with the TMS320LF2407 DSP, the motion-control IC: IRMCK201 and IPM. The hardware circuit is http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php described in detail. The software of the system includes the design of main routine, position loop interrupt service subroutine, DSP and IRMCK201 communication routine and so on. Flow charts are presented in this paper.This paper research the PMSM position servo system based on IRMCK201 in theory and simulation, present the Grey PID Control strategy, and design a practical AC servo system. The studies we have performed will make for the farther research.

The Experimental Research on Permanent Magnetic Bearing

　　The Experimental Research on Permanent Magnetic Bearing
　　Magnetic bearing have many advantages such as no frication, no wear, no lubricant equipment and long service life, they are now moving beyond promise into actual service in such applications as aircraft, electric power generation, high speed and high precision machine tool, petroleum refining and robots. Magnetic bearing with permanent magnet to provide levitation force have lower power consumption, smaller volume, more compact structure. It becomes the important aspect of magnetic bearing.Based on dot magnetic charge theory, radial magnetized Cast Alnico Magnet model and axial magnetized model are established. The models embody the relationship between radial displacement and loads.
　　Comparing the radial magnetized model and axial magnetized model, for the performance of the loads and stiffness, the result of the radial magnetized model is better. Machining the axial magnetized bearing is easier than machining the radial magnetized bearing. Axial magnetized bearing are chosen.The permeability of iron is big, magnetic reluctance of stainless steel is big, so, the two kinds of material are chosen as the material of the magnetic bearing. Use ANSYS to analyze the effect of iron and stainless steel for the density and direction of magnetic flux, iron can assemble flux, stainless steel affects the density and direction of magnetic flux little. That means the choices are suitable. Finish designing and machining the bearing assembly.For testing the performance of the bearing, http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php finishing designing and machining testing station, the performance of testing station is stable, operate easily. The performance of testing station meets the requirement : maximum loads is 17N, maximum speed is 4000r/min.The trend of relationship between radial displacement and loads is the same as the theoretic. Speed affects the value of the radial sum displacement, at certain speed (lower than 1000r/min), the higher the speed is, the bigger the value of the radial sum displacement is.Through the trial, actual loads is smaller than theoretical loads, the problem may be magnetic flux leakage machining, accuracy of bearing and non - uniform magnetization of magnetic rings. Improve them further,Through studying on the trial results of stiffness of bearing, speed affects the radial displacement much. Once the speed is bigger than the certain value, the direction of radial displacement is up. Maybe the air-dynamic lubrication makes that. The reason and the regulation need be studied further.

Research on the Speed-Adjustment System of Brushless DC Motors Based on Grey Control

　　Research on the Speed-Adjustment System of Brushless DC Motors Based on Grey Control
　　The brushless DC motors (BLDCM) have the advantage of small sizes, low weight, and easy to maintain. So it has been widely used in every field of industrial control and has a broad prospect in application. The theory of BLDCM and design method is already more mature. Its further application depends on control strategy.rubber magnetic sheet Conventional PID control has simple construction, high reliability, and easy to realize. PID controller has good control effect if the parameters of system model have not big variation, but when controlled object has high nonlinear trait and high uncertainty, PID control can’t achieve good result. As brushless DC motor (BLDCM) is a multi-variable and non-linear system, using conventional PID control can not obtain satisfied control effect.Aiming at these problems, This paper design a speed-adjustment system of brushless DC motor based on grey prediction controlThe grey prediction controller is independent of system model and overcomes the shortcomings of classic PID controller, so the grey prediction controller has good performance and simple algorithm. The controller can be designed without accurate motor model. The simulation http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php illustrates that excellent flexibility and adaptability as well as high precision and good robustness are obtained by the proposed strategy.The high-speed digital signal processor (DSP) has been gotten widely application in the field of motor control. At last of this paper, TI’s TMS320LF2407A DSP is used to build up the driving system and control system of permanent magnet brushless DC motor. And a software system is worked out to achieve the function of current sampling, rotor position detection, speed control and current regulation.

Research on Application of State Observer in Servo Control System

　　Research on Application of State Observer in Servo Control System
　　With the rapid development of power electronic technology、micro-compter technology、rare-earth permanent magnetic materials and the control theory, permanent-magnet synchronous motor(PMSM) has been widely used in motion control system with low or medium capacity. However,the permanent-magnet synchronous servo system is easily Block Ceramic Magnets influenced by factors such as the changing parameters of the electrical machine, the disturbing effect from outside load and the sensor noise ect. People have to do some research on the advanced control strategies and control methods in order to acquire the high performance and low cost permanent-magnet synchronous servo system which has strong adaptability and the capacity of anti-disturbing. This paper is mainly centered about the research on high performance and low cost permanent-magnet synchronous servo system.
　　The mathematics model of the permanent-magnet synchronous motor (PMSM)in d-q reference frame is established , and the PMSM vector control strategy is analyzed and then the control method rotor field-orientation vector control of i d=0 is chosen. According to the automatic control theory, the components and the mathematics models of the permanent-magnet synchronous servo system are analyzed in detail, in accordance with the engineering design method of automatic control system adjustor ,the current loop and the velocity loop are designed. In order to meet the http://www.chinamagnets.biz/Ceramic/Block-Ceramic-Magnets.php needs of rapid dynamic respond and at the same time ,make the system has the strong ability of anti-disturbing and restraining the sensor noise, The state observer is introduced in the control system, the current loop state observer and the velocity loop state observer are set up respectively, by these means, the parameters such as the feedback current,position, velocity and the load torque can be estimated in advance. Based on these, The simulink design on the whole system under the simulink circumstance is proposed in this paper. In the simulink design, the relationship between the system’s dynamic performance and the parameters of the system adjustor and state observer are discussed detailedly; further more, how the adjustor and state observer’s parameters can influence the sensor noise are analyzed; the solving methods in system control are presented.The performance comparisons between the systems using digital filter and the state observer are given. The experimental results show that the system using the state observer has more excellent quality in tracking and anti-disturbing.

Development of the Permanent AC Servo Control System Based on DSP

　　Development of the Permanent AC Servo Control System Based on DSP
　　With the development of material technology, power electronics technology, control theory, computer technology, micro-electronics technology and the improvement of motor manufacture level, permanent magnet synchronous motor(PMSM) alternating current(AC) servo systems are widely used in all kinds of industry areas. In this paper, based on the analysis of the structure, movement principle and math model of PMSM, fundamental theories of vector control, coordinates transform and algorithm of space vector PWM are introduced and PI control, speed neodymium standard state and position calculation methods are discussed. Simulation models of AC servo system are established using software MATLAB and analyzed. The feasibility and validity of the designed control schemes are proved by simulation results. Then speed sensorless control for PMSM is studied and simulation models are established. The whole hardware structure of PMSM AC servo system and the lately TMS320F2812 DSP made by Texas Instruments Incorporated are analyzed. The controller hardware of PMSM AC servo system based on the DSP is designed and the function control software flow is http://www.999magnet.com/products/112-neodymium-standard-state presented. The servo system is tested on a permanent AC motor. Experiment results prove that this control system is feasible and the three-loop control strategy can be realized. The performance of the designed AC servo system can meet the needs of applications.

A Gain Scheduled Robust Regulator for Sinusoidal Ripples Elimination of AC PM Motor Systems

　　A Gain Scheduled Robust Regulator for Sinusoidal Ripples Elimination of AC PM Motor Systems
　　This thesis addresses the problem of the elimination of torque and velocity rip-ples in the Alternating Current (AC) Permanent Magnet (PM) motor control systems,especially that of the sinusoidal disturbances.For the purpose of designing a simple but effective controller, the torque ripplescaused by DC offsets and phase gain error are studied and formulated mathematically.Firstly, the ripples generated by the offset currents are discussed. Secondly, the ripplesgeneration are analyzed thoroughly when the current gains of the motor drivers are dif-ferent between phases. The torque ripples can be modeled as two sinusoidal functionswhose frequencies depend Alnico Magnets on the motor speed. The internal model principle (IMP) isthen used to design a controller to eliminate the torque and velocity ripples withoutestimating the amplitude and the phase values of the sinusoidal disturbances. A gainscheduled (GS) robust two-degree-of-freedom (2DOF) speed regulator based on theIMP and the pole-zero placement technique is developed to eliminate the torque andvelocity ripples and to achieve a desirable tracking response. When the sinusoidal dis-turbances have varying frequencies, the stability radius of the system can be derivedwith the small gain theorem. Finally, we show that this regulator design algorithmcan be generalized to eliminate any number of sinusoidal torque ripples with knownfrequencies in http://www.999magnet.com/products/108-alnico-magnets AC PM motor system.Simulation shows that the GS robust 2DOF speed regulators based on the IMPand pole-zero placement technique can effectively eliminate the sinusoidal distur-bances. If the acceleration profile is available for the GS controller, the stability radiuscan be enlarged.

Research of DSP-Based Control System for Permanent Magnet Synchronous Motor

　　Research of DSP-Based Control System for Permanent Magnet Synchronous Motor
　　With the discovery of new kind of Permanent Magnet material and the development in manufacturing permanent magnet synchronous motor(PMSM), the PMSM control system have accepted more and more concerns. So, the research of PMSM control system must be a kind of inevitable development trend and the focus in the future. This paper uses TMS320LF2812 type of Digital Signal Processor (DSP) as the core, which is designed to be special-purpose on motor control by TI Company, and designs a set of control system for PMSM. The jobs that have Neodymium Magnets been done include folio wings:The research work of this thesis, both academic and practical, mainly on the speed-adjustment system of permanent magnet synchronous motor (PMSM), which is typical in control systems of AC motor.
　　Firstly, this thesis summarizes and analyzes the evolution, the present, and the prospect of control systems and PMSM based on a large number of referenced materials. Besides, it makes an introduction on the structure and control strategies of the universal PMSM speed-adjustment systems.Then the hardware and software design are presented. The main loop circuit, the micro-processor, the interface circuit and the power unit of the control system are introduced in hardware design. In software design, this article introduces the main control program and the http://www.999magnet.com/products/110-sintered-neodymium-magnets main interrupt program. More, it introduces some program, like SPWM develop process, e.g. Electromagnetism Compatibility (EMC) of digital system is also discussed in this paper.Finally, according to the analysis of these experimental results, some conclusions from this thesis have been proved. The design method of protection circuit and crosstalk reduction is proposed. A reliable system is developed and verified.

Electromagnetic Field Analysis of Low Speed Disk Permanent Magnet Synchronous Motor

　　Electromagnetic Field Analysis of Low Speed Disk Permanent Magnet Synchronous Motor
　　As a new type high performance motor, eliminating the need for gear reduction, low speed disk permanent magnet synchronous motor (DPMSM) can simplify the structure of the entire transmission system and improve the system’s reliability. And there are still many characteristics of low mass, compact structure, low noise, small moment of inertia, steady running status in low speed and small electromechanical time constant in this kind of motor, so it has broad prospects for application.Low speed DPMSM is a kind of multi-polar low speed PMSM, the neodymium prices structure of this motor has two notable features. One is the technique of pole-slot match which is applied to the motor, it can decrease the number of stator’s slot and it can effectively inhibit cogging torque. The other is the structure of in-rotor which is applied to disk motor. This structure can reduce motor’s volume and raise motor’s power density.
　　Due to the structure of low speed DPMSM is different from traditional motor, common calculation and analysis methods can’t be applied to it. In this paper, the performance of this kind of motor is researched on the basis of magnetic field theory.In motor magnetic field calculation, the shape of magnet is optimized by finite element method (FEM). The influence http://www.999magnet.com/products/142-neodymium-prices on air gap flux distribution, leakage coefficient, EMF waveform and cogging torque which is produced by the variation in motor’s parameter is studied. After using the EMF waveform Fourier analysis, the rule of harmonic torque’s variation can be got. On the basis of considering both torque variation, the main electrical parameter can be optimized and the low speed motor running smoothness can be improved.Based on the electromagnet field calculation, low speed DPMSM is simulated according to the requirement of vector control method. The results of simulation indicate that the motor’s starting performance is well and it has steady running status in low speed. The results of simulation can also provide the favorable theory foundation of the hardware parameter for control system.

Research on Iterative Learning Control for Permanent Magnet Linear Synchronous Motors

　　Research on Iterative Learning Control for Permanent Magnet Linear Synchronous Motors
　　In factory automation, especially in industries robots and machinetools, permanent magnet synchronous linear motors (PMSLM) have beenan attractive choice because of its high reliability, high actuates force, highefficiency and long move distance. Iterative Learning Control (ILC),which is well used in system with a naturally repetitive action, has rubber magnetic sheet becamea hotspot in intelligent control for the reason of its simple arithmetic, andeffective control. In this thesis, ILC algorithm is studied and used incontrolling PMSLM. Furthermore, the marriages of ILC and Sliding ModeControl(SMC),Radial Basis Function(RBF) are used to control PMSLM.First, based on the Simulink/Matlab, a general simulation model ofPMLSM controlled by SPWM vector current sluggish tracking isestablished with block diagram through particular analysis and research ofPMLSM and its vector control principles. Then the following three parts ofthe article are: Position control for PMLPM using ILC. The conventionalfeedback PID control is combined with feedforward ILC, the formal onestabilizes the PMLSM system, while the later enhances the trajectories tracking performance by capitalizing on the http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php experience gained from therepeated execution of the same operations; Position control for PMLSMusing SMC plug ILC. SMC has the ability of stabilizing and faster thesystem. System can be better under the control of SMC plug ILC;Reference adjustment for PMLSM under the control of ILC and RBF. Thisnew scheme can progress the system. The simulation researches andresults which show at the end of each chapter, show the validity of thecontrol strategies that designed in this paper. At last, a summary of thethesis and a view of the future are given.

Research of Performance at Low Speed in DTC of Permanent Magnet Synchronous Motor

　　Research of Performance at Low Speed in DTC of Permanent Magnet Synchronous Motor
　　DTC(direct torque control) has simple structure,direct control means,and high stable/transient performance.DTC are focused on asynchronous motors, until recent years some researches begin to study the application of DTC into Permanent Magnet Synchronous Motor. For the research is still in its primary stage,many questions need to be solved.One of central problems is that how to improve the proformance at low speed in direct torque control.Cast Alnico Magnet The paper is based on the trait of Permanent Magnet Synchronous Motor,and studies the cause of torque and speed ripple of direct torque control system,when Permanent Magnet Synchronous Motor runs at low speed.The paper proposes amended methods.The nuclear work and innovation of the paper is as follows:1. Based on the physical model of Permanent Magnet Synchronous Motor,the paper establishes the simulation model of direct torque control,and studies the effect of zero-voltage vector to the torque and magnetic flux linkage.2. Based on the deadtime model,the paper studies the effect of the deadtime effect to the torque and magnetic flux linkage. The conclusion of theory verifies that the deadtime effect can reduce the torque and impacts on the performance of the system.The paper proposes voltage compensation formula of deadtime http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php effect. Simulation results indicate that the formula is good.3. Based on PI estimator model for the stator resistance,the paper analyses the changing value of stator resistance to the effect of the torque and speed,and proposes adaptive coefficient amended method of fuzzy control theory to improve the veracity of the stator resistance estimator. Simulation results are presented to verify that amended method can improve the dynamic performance of system.4. Based on the whole framework of direct torque control system of Permanent Magnet Synchronous Motor,the paper proposes the hardware and software methods of direct torque control system with TMS320F2812 as controller,and discusses that DSP design methods of direct torque controller.

Study on Magnetic Properties of Fe3B/Nd2Fe14B Type Nanocrystalline Composite Permanent Magnets and Primary Discussion of Bonded Magnets

　　Study on Magnetic Properties of Fe3B/Nd2Fe14B Type Nanocrystalline Composite Permanent Magnets and Primary Discussion of Bonded Magnets
　　Nanocrystalline composite permanent magnetic material is a new type of permanent magnetic material developed in recent years, that is consisted of soft and hard magnetic phases in the nanoscale, shows single ferromagnetic phase’s magnetization and antimagnetization characteristics by exchange couple effect between soft and hard magnetic phases, and possesses remanence enhancement effect. Its maximum energy product (BH) max can get 1 MJ/m3 neodymium prices theoretically, which exceeds any single-phase permanent magnetic materials; And it maybe developed to be a further novel generation of bonded permanent magnetic material, owing to the low rare earth content, high chemical stability, low costs, high practical value and good applications in the future.But the exchange couple interaction between soft and hard magnetic phases is belong to short-range exchange interaction, if in order to obtain high magnetic properties, then do control two phases’ grain size and improve microstructure by ingredient optimizing, process improving to more improve magnetic properties.In the paper, though low Nd-content’s (containing 4.5at%) nanocomposite permanent magnetic material properties are lower than high Nd-content’s, however, due to high remanence, very low costs http://www.999magnet.com/products/142-neodymium-prices and application in many low request fields, the present research work is meaningful.First, discussing 4.5at% Nd-content’s nanocomposite permanent material Nd4.5Fe74.5+xB21-x (with x varying between 0 and 4 in increments of 1), while the basic component B is to some extent, permanent magnets’ properties is optimum. Last result shows that 20at% B-content’s permanent magnet’s properties are optimum.Second, to investigate the change of Tb-content causing accordingly magnetic properties’ change, the sample Nd4.5-xTbxFe75.5B20 (with x varying between 0.25 and 1.25 in increments of 0.25)

Research and Development of Premium-efficiency Permanent Magnet Synchronous Motor

　　Research and Development of Premium-efficiency Permanent Magnet Synchronous Motor
　　As a sub- project of national science and technology key project——"The Research andDevelopment of High Performance Rare Earth Permanent Magnet Machine ", this paper presents the research on several key questions of designing premium-efficiency permanent magnet synchronous motor uses in the fan or pump ,such as efficiency, power factor, pull-out torque and so on. The achievement that has value in the Engineering is obtained.First of all, in this paper the influence of the fan on the efficiency of motor is analyzed. As the premium-efficiency permanent magnet motor used in the fan and the pump, the rotating speed of motor is high, the influence Neodymium Magnets of the fan on the efficiency of the motor is extremely obvious. The loss of traditional centrifugal fan is approximately 3% of total loss in 2 pole-pair motor.
　　Therefore, in this article the characteristics and the merits of axial-flow fan are used, substituting the axial-flow fan for traditional centrifugal fan. According to the theoretical calculation and the experimental confirmation, those measures receive good effect.Next, in the process of researching how to enhances the efficiency of motor, in this paper the time-stepping finite element method is used, the calculation formula has modified, achieved good effect, the theory basis for later calculation of iron loss of permanent magnet motor is found. Meanwhile, detail analysis and research on the factors that have influence on the iron loss, the copper loss and the stray losses are conducted, http://www.999magnet.com/products/110-sintered-neodymium-magnets the corresponding measures are taken in order to reduce these kinds of losses.Then, through synthesis considering of these factors, the optimized design of two types of motors is carried in anneal arithmetic. The optimized design of the stator lamination mainly aims for minimizing the sum of the copper loss and the iron loss. The optimized design of the rotor is taken mainly including the rotor magnetic circuit, the shape of rotor slot, magnetic bridge, etc. At the same time, the air gap length of the motor is also optimized.Finally, prototypes of permanent magnet motor of two specifications are developed.The prototypes have achieved the anticipated effect and passed the appraisal, the conclusion is "theinternational leading level". Meanwhile, it also proves that the achievement has an important value in practical application.

Research on the Digital Servo System of Permanent Magnet Synchronization Motor Based on DSP

　　Research on the Digital Servo System of Permanent Magnet Synchronization Motor Based on DSP
　　Serve drive technology through three stages which were direct current servo system, brushless direct current system and PMSM(Permanent Magnet Synchronization Motor) system. With the unceasing development of modernized industry, higher speed, higher precision and higher efficiency’s require were brought forward. AC (Alternating Current) PMSM have higher response, without maintenance(without carbon brush and commutator),higher reliabilities’ characteristic. It use MCU(Microprocessor Control Unit) technology, high-power and high performance semiconductor technology, permanent magnet material technics and high performance ratio, not only does it has widest foreground and applied value in numerical control lathe, robots and aviation & Alnico Magnets spaceflight fields but also it anabasis mightily textile field, becoming one of the important technique means to carry out mechanical-electrical integration digitization.
　　This paper make an in-depth and all-around study on the Digitization PMSM Servo Driver and divide into four parts. The main contents are:1 .This part set up the ensemble framework of pmsm servo control system, analyse the structure and mathematics model of PMSM; and expound theory basic and waveform’s engender principle of SVPWM( Space Vector Pulse Width Modulation) technology.2. Design of the PMSM servo hardware system. The power transform current and drive current are composed of power drive IR2136 and six IRGB440U of TI company, which is provided with high voltage value and good stability. The system’s core is high performance chip TMS320LF2407A of TI company. It use mix optical rotary encoder to achieve precise position orientation and get the speed’s feedback value. It use hall current sensor to achieve current’s feedback. The system’s http://www.999magnet.com/products/108-alnico-magnets integration degree is very high to realize digitization conveniently.3. Design of the PMSM servo software system. The part expatiate every module function of system software and introduce the implement plan of SVPWM importantly. Design of the digital PI adjuster of the current loop and speed loopgiving the calculate way of speed feedback and position feedback.4. Debug the servo system based on the software and hardware of system, which include Matlab/Simulink emulation and actual system experiment; display the emulational and experiment waveform. Analyse and discuss the arisen problem during experiment process and experiment result, and give out the solution.In the end, the paper summarize the whole exploitation work and bring forward the improving aspects, as the latter study work’s reference.

Researches on Behavior of Noise and Vibration in Permanent Magnet Servomotor for Elevator

　　Researches on Behavior of Noise and Vibration in Permanent Magnet Servomotor for Elevator
　　Researches on behavior of noise and vibration in permanent magnet servomotor for elevator are conducted using the software of finite element method in this dissertation. The main aspect of electromagnetic noise and vibration in permanent magnet servomotor is presented.Calculation of radial electromagnetic force causing by vary harmonic magnetic field in air gap is done in 9.5kW permanent magnet servomotor for elevator. Because of the radial electromagnetic force creating in air gap of magnetic field on stator tooth is the main reason on electromagnetic noise and vibration in PMSM, extracting radial magnetic flux density and calculating radial electromagnetic force are important in analysis of electromagnetic field. By means of 2-D electromagnetic field calculation and 3-D electromagnetic field calculation of servomotor, it shows that magnetic flux neodymium standard state density waveform in the air gap relates to magnet configuration, current harmonics, wound distribution, the number and formation of tooth slot of stator and rotor and power angle.
　　The principle resulting in radial electromagnetic force in PMSM is deduced.According to loading obtained from analysis of electromagnetic field, the structure of PMSM transient analysis is presented. The radial electromagnetic force loading on stator tooth in motion electromagnetic field is applied to 3-D model of PMSM. After analysis of structure, the response of all nodes is obtained. Modal analysis in structure of electrical motor is an important method to determine whether the resonance of the structure can be induced under radial electromagnetic force. Various modal shape of 9.5kW PM servomotor for elevator are calculated by 3-D finite element method. The improved scheme is presented in structure of PMSM.In the transient analysis of 2-D sound field on PM servomotor, the loading obtained from analysis of electromagnetic field is applied on stator tooth also. http://www.999magnet.com/products/112-neodymium-standard-state The model of fluid-structure coupling interface and fluid border is established respectively. The response of structure and mediate nodes sound pressure, displacement is gained by transient sound field analysis, which is the base of the prediction of noise value of PMSM.Through experimental investigation of PMSM, it shows that the switching frequency of pulse width modulation (PWM) current from inverter is a main factor affecting upon sound radiation of PMSM in control system of permanent magnet motor.

Research on Permanent Magnet Synchronous Motor Direct Torque Control Technology

　　Research on Permanent Magnet Synchronous Motor Direct Torque Control Technology
　　Direct torque control (DTC) is a new high-performance AC drive technology following vector control. More attention is paid to DTC in AC motor speed control area because of its advantages such as fast dynamic response,relatively simple algorithm and so on. With deep study of permanent magnet synchronous motor (PMSM), DTC strategy is applied gradually in PMSM control area. This paper is aimed at studying DTC technology deeply for PMSM.In order to make an neodymium prices accurate analysis for the principle of DTC, mathematical analysis of motors to be controlled is essential. So the operational principle of PMSM is analyzed firstly based on its structure in this paper, then mathematical models of PMSM are established under different reference coordinate systems.After that, the theory of DTC is studied deeply and traditional control system based on Bang-Bang mode is researched. The effects of space voltage vectors towards stator flux and electromagnetic torque are also analyzed. Due to existent disadvantages of traditional DTC mode, Space Vector Pulse Width Modulation is brought into PMSM DTC system in order to resolve the problems such as remarkable fluctuations of flux and torque. Moreover, the improved algorithm is griven for the harmonious control of stator flux http://www.999magnet.com/products/142-neodymium-prices and electromagenic torque.With Matlab6.5/Simulink the subsystems of traditional DTC system and SVPWM DTC system for PMSM are modeled and designed. Then the simulation models of the above two control strategies are also established. Iimitating actual control systems, simulation research is conducted and the experimental results are corresponding with theory analysis.The trend of motor control is total digitalization. In this paper, experimental platform for PMSM DTC system is designed baesd on TMS320LF2407A, and then concrete realization methods of software and hardware are shown. After experimental research, main experimental results are listed. The results prove that the control system is designed logically with high dynamic and static performance.

The Second Order Sliding Mode Control of Permanent-magnet Linear Synchronous Motor

　　The Second Order Sliding Mode Control of Permanent-magnet Linear Synchronous Motor
　　Permanent magnet AC servo technique has grown rapidly since 1980’s, the applications of permanent-magnet linear synchronous motor become more and more complex and diversified, many higher requests are offered, the servo systems are hoped to have the good performances of speed-tracking and against disturbance. In that variable structure sliding mode control theory has some advantages, such as high response, good robustness and easy realization, this theory has been applied gradually in the electric drive control area. But there is a drawback—chattering in the Neodymium Magnets engineering application, i.e. high frequency oscillation is caused by switching control. The reason is that high frequency switch is impossible for controller and implement machine, and system has steady error at steady state, even system elements are destroyed by high frequency. In order to overcome the blight caused by parameter variety and disturbance outside, and realized high performance and strong robustness of AC servo system, second sliding mode control theory is used based on the comprehensively deep research on the PMLSM mathematics model and control theory in this thesis.
　　Traditional sliding mode is introduced firstly in this thesis, then higher sliding mode theory is expatiated, the reason of weakening chattering is introduced particularly. Attach most importance to the second sliding mode control theory, the keystone and some algorithms is introduced, twisting algorithm and sup-twisting algorithm are separately researched in allusion to continues and discrete PMLSM servo system. The results of simulation show that second sliding mode reserve all of advantages of traditional sliding mode, and attenuates chattering availably.In that PMLSM servo system has characteristic of multi time scales, the singular perturbation method and second sliding mode http://www.999magnet.com/products/110-sintered-neodymium-magnets theory are combined in order to solve nonlinear of system model and the coupling between the variables. The singular perturbation method is applied to decouple the permanent magnet linear synchronous motor into subsystems with different time scales, then the second order sliding mode control algorithm—twisting algorithm is applied to realize the control of each subsystem, the composite control of the permanent magnet linear synchronous motor is composed of control of each subsystem. The difficulty of controller designing is reduced by this method. The singular perturbation method has quasi steady state method and block diagonalized method aim at big and small discrepancy of time scales of subsystems. Two different PMLSM is used as control plant in order to validate two methods validity in this thesis. The results of simulation show that this strategy has very good speed-tracking performance, and has very strong robustness against load disturbances, parameters varieties and the other uncertainties.

A Study on the Key Technique of a Consequent-pole Bearingless Permanent Magnet Motor

　　A Study on the Key Technique of a Consequent-pole Bearingless Permanent Magnet Motor
　　The consequent-pole bearingless motor combines the excellence of the magnetic bearing and bearingless motor. The rotational angular position is not necessary in its suspension control, so the coupling of a conventional permanent-magnet-type bearingless motor between the suspension and torque control is weakened. It also avoids the compromise between radial suspension force and drive torque. Thus, it has extensive applied foreground in national defence, industry, agriculture, daily life, and so on.In this paper, a profound theoretical analysis on mechanism of magnetic levitation for a consequent-pole permanent magnet bearingless motor is presented and its mathematical model is also analyzed. In succession, a finite-element analysis model with 24 slots is built using Ansoft software. Samarium Cobalt Magnets On this condition, the distribution of the magnetic field inside is simulated and the principle of magnetic levitation has been demonstrated. An in-depth simulation and analysis on the torque and suspension force has been done. The simulation results suggest that torque is in proportion to torque current and radial force is in proportion to suspension current. Meanwhile, rotational angular position is unnecessary in the magnetic suspension control, so the decoupling control of the levitation and torque can be realized. For decreasing the ripple of torque, the second analysis model with fractional slot is built, of which the stator slot number is 21. Its torque and suspension force is also analyzed. Here, by comparing the http://www.chinamagnets.biz/Samarium%20Cobalt/Samarium-Cobalt-Magnets.php torque and radial force between the consequent-pole bearingless motor and the surface-mount bearingless motor, it is found that the suspension force of the former is much larger, when their torque is close. Thus, it avoids the compromise between radial suspension force and drive torque.On the basis of theoretical analysis and finite-element analysis, experimental study on a consequent-pole bearingless motor has been done. Construct the load experimental platform for a bearingless motor. Completed and debugged a digital control system based on TMS320F2812, including the program used to control the torque and suspension force of a consequent-pole bearingless motor. On this condition, a series of experiments could be put in process.

Position Sensorless Control and Adaptive Speed Control of Permanent Magnet Synchronous Motor

　　Position Sensorless Control and Adaptive Speed Control of Permanent Magnet Synchronous Motor
　　Permanent Magnet Synchronous Motor (PMSM) has the advantages of small volume, light in weight, small torque ripple, simplicity in torque control, steady rotate speed, fast dynamical speed response and strong overload ability, so it is widely used in AC speed regulating system. However, the existing sensors increase the cost, reduce the reliability of the system and are difficult to mount and maintain, so it can’t be used in bad environment and high demand conditions. Therefore, position sensorless control has become an important topic of PMSM research. Moreover, because PMSM is a multi-variable, nonlinear and strong coupling system, the conventional PID controller is easily rubber magnetic sheet subjected to the influence of motor parameter variation and load disturbance. So it is hard to satisfy the need in the situations when load variation is big and the requirement of speed accuracy and torque control precision is high.
　　The neural network (NN) is well known for its strong nonlinear mapping capability, and can be applied to the complex speed control system. Conventional BP neural network has the disadvantages such as complex structure, slow training speed, and easily landing into local minimum points. All of these disqualify it from filling the need of control of the PMSM. However, RBF neural network has many outstanding merits, for example, quick learning speed and strong generalization ability. Satisfying control results can be obtained by combining RBF neural network with quick training arithmetic and appropriate control mode.At first, this paper establishes the dynamic simulation models of the 5-phase PMSM and its driving system based on MATLAB/SIMULINK. Then, the vector control speed regulating system of PMSM is simulated and analyzed. Meanwhile, the system hardware and software design based on TMS320F2812 DSP is also introduced in the following chapter. The rotor position http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php detection and speed regulation, as well as overcurrent and undervoltage protection are realized. And then the research on intelligent control strategies is processed on it.Firstly, this paper presents a new control method for PMSM, which is based on radial basis function (RBF) neural network. By mapping the voltages and currents of stationaryα-βreference frame to the angle and speed of rotor, the network can replace the traditional position sensors. The theory in this paper is verified by simulation results. Then, the adaptive speed control system for permanent magnet synchronous motor based on RBF neural network is presented. It constructs speed controller by the network that has been trained off-line and regulates network’s parameters in the course of controlling in order to adapt to the change of the environment. In addition, the system constructs another wavelet network to offer gradient parameters by on-line identification, which are used by the control network for its on-line study. The simulation results show that with this method, quick response speed, high control precision and good adaptability can be achieved.