Research and Realization of PMSM Vector Control System Based on TMS320F2812

　　Research and Realization of PMSM Vector Control System Based on TMS320F2812
　　Recently, with the development of high performance magnetic material,modern power electronic component and technology, control theory,furthermore, the special use MCU and simulation, it becomes possible inrecent years to make PMSM to be widely used. Thus, PMSM is a new type ofmotor involving in many subjects. Its advantages are high speed, highefficiency, high dynamic response, high temperature bearing capacity andreliability. It also has a long life and low noise characteristics than others. It iswidely applied to each domain, such as the computer system, householdappliances, Industrial production, Transportation vehicle, medical equipmentand so on. So it worth to studying and it also become hot topic.The DSP device depends upon DSP theory and algorithm to develop. It isused to dealing with different real digital signal’s processing. It be used in theVC system of PMSM to improve it Automation, precision and reliability,TMS320F2812 is newest CPU Block Ceramic Magnets which is use for motor servo control systemuntil now. It basically satisfies the system request.The thesis is about Research and Realization of PMSM Vector ControlSystem Based on TMS320F2812.It realized fully digital-controlled and doubleclosed-loop control system.The thesis mainly discusses the vector control principle of PMSM, andthen gives the whole plan of the system, include the hardware circuit and thesoftware part .finally it gives the test results of the system.
　　The full text isdivided into seven chapters altogether.Chapter 1: This part introduces the background and meaning of thesubject research, related technology, main basic exchange frequencyconversion technology and its respective characteristic.Chapter 2: Introduce the basic principle of the vector control with PMSMand the necessary knowledge, mainly including the work principle of PMSM,Mathematical model base on d,q,0 Coordinate system, Coordinate conversionand the whole system, and emphatically introduced the SVPWM waveproduction principle.Chapter 3: Give the total project and the hardware structure of the system.It include the TM320F2812 and its small system broad, Power drivemodule-DR15A and its interface circuit, Position examination circuit anMan-machine interactive part and so on ,it is the base of the whole system.Chapter 4: Give the software http://www.chinamagnets.biz/Ceramic/Block-Ceramic-Magnets.php design of the system. First, it is the briefintroduction of CCS, and then it is relatively the detail of software system,which includes the SVPWM wave subprogram, the position subprogram, thecurrent collection subprogram, the Coordinate conversion subprogram and picontroller etc.Chapter 5: Introduce the Realization of PMSM Vector Control System in MATLAB/SIMULINK platform .Give the main program,other subprogramand its simulation result, and realized the pro and con speed adjusting ofPMSM,At the same time, through the simulation we have Deeper and morevivid comprehend about the vector control system of PMSM.It is helpful toreal system and makes me avoid some unnecessary trouble.Chapter 6: It is the experiment result .first is SVPWM waveform, thephase circuit waveform, speed controlling curve. And then analyze it withtheory. All of those test result prove the VC system of PMSM.Chapter 7: Summarize the full text. It summarizes the research work andachievement, analyzes the way to make improved, and gives the suggestion ofthe future work. The mainly achievements of the thesis includes the totaldesign of PMSM control system, the research of the key technique and therealization of system.

Simulation and Design of Control System for Low Speed PM Generator Direct Driven by Wind Turbine

　　Simulation and Design of Control System for Low Speed PM Generator Direct Driven by Wind Turbine
　　The energy such as petroleum and coal is in short supply, and simultaneously, the traditional energy caused more and more serious pollution to the environment, this has already concerned human survival and development problem. Wind power generation as a new energy is increasingly attraction interest and quickly development in recent years. The system of low speed PM generator direct driven by wind turbine which compares with the conventional wind power plants the rubber magnetic sheet generator is coupled with the turbine via a gearbox, does not have to maintain frequently, structure simple, electricity generation efficiency high, the overall cost relative is low. In the countryside and the remote districts the wind power generation is good application prospect.The main work of the thesis is as follow.This paper mainly studies the system of low speed PM generator direct driven by wind turbine. In theoretically, according to the wind power generation system mathematical model, the dynamic performance of the power generation system for different operation modes is simulated based on Matlab/Simulink.The output of the system of PM generator direct driven by wind turbine is variable voltage and variable frequency power. To get constant voltage and constant frequency energy that users need, the software and hardware of the inverter control system is designed. The inverter controller is adopted PIC http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php single-chip-computer and PWM chip SA4828, and IPM as inverter, LC wave filter. The voltage feedback is got through the chip AD736 which accomplishes the task of sampling the voltage.To realize the reliable operation the wind power generation system, the software and hardware of the pitch and yaw control system designed. The controller uses PICsingle-chip computer as central controller, which operates the system through measuring the wind speed, rotational speed, battery voltage and the charging current, etc. At the same time in order to strengthen the anti-interference performance of the controller, the input and output are isolated by the photo-electricity.The paper introduces the system simulation and software and hardware design in detail, and produces the simulation and the test result.

赤铁矿选矿新工艺试验研究

　　赤铁矿选矿新工艺试验研究
　　Our country is abound in iron mine resources, but the run of mine average grade is only 33.00 percent, majority of iron mine belong to the hematite type which have lower grade, high impurity and fine-disseminated, this part of mine are impacted by such facts as geographical environment, mine cause, the level of mineral processing equipment, the technological processing which selected is generally more complex, the separation indicators is lower.It is particularly important that explore mineral processing of technology, bring forward the recovery of useful minerals’ separation method, technological processing and technological parameters, to exploit hematite resources, using the existing technical equipment.The iron mine of Yunnan are retained 3.6594 million tons, the grade of Fe is 35.50 percent. According to enterprise’s request, the powdered ore is the mainly concentrate products, and the concentrate with 55 percent iron content, iron recovery get to 80 percent.The neodymium prices beneficiation experimental research of the coarse(6mm-0.15mm)made by Changsha Research Institute of mineral and Metallurgical, can get the concentrate with 55 percent iron content, iron recovery above 60 percent, through one-stage roughing, one-stage sweeping and one-stage cleaning, applying the Wet high-intensity permanent magnetic separator, concentrate products meet the requirements. But the middling of coarse which merged by the tailings of cleaning and the concentrate of sweeping is difficult to achieve the requirements of qualified products, the indicators is not ideal, the trend is not clear. So the enterprise decided to carry out comprehensive utilization of the middling of coarse and the part of fine by Kunming University of Science and Technology.
　　Through tests verified, the fundamental reason for the middling of course’s indicators is not ideal is that the the useful minerals are not dissociative enough.Regrinding and separating the middling of coarse,it is found that the separated properties are close to the fine. So, two parts can be separated by merging. Employing the new beneficiation technology with the coarse and fine separation, the middling of coarse re-grinded and the fine are merged to separate.After a series of test conditions, the part of fine(-0.15mm-0)can obtain the concentrate with 57 percent iron http://www.999magnet.com/products/142-neodymium-prices content,iron recovery 85 percent,through one-stage roughing and one-stage sweeping.After cleaning by shaking table,it can attain to the concentrate with 60 percent iron content, iron recovery get to 78 percent.The middling of coarse is separately grinded and separated by one-stage roughing and one-stage sweeping, it can get the coarse concentrate with 55 percent iron content, iron recovery close to 90 percent. After cleaning by shaking table, obtaining the concentrate with 60 percent iron content, iron recovery can get to 80 percent.This technology is the new beneficiation technology, new technique; in order to product the qualified powdered mine. Sorting by size, it can decrease the energy consumption of crushing and grinding.Employing the permanent equipment with small power consumption, it decreased the energy consumption.The technology of magnetic separation and gravity separation is shorter process, less investment, good economic returns and short construction periods, so it is greatly reduce the beneficiation cost.The Iron mine Concentrator has been put into production since March 2007, the grade of iron concentrate is more than 55 percent, the recovery is http://www.999magnet.com/products/142-neodymium-prices more than 80 percent, and the indicators are stable.Therefore, employing the new beneficiation technology with the coarse and fine separation, the middling of coarse re-grinded and the fine are merged to separate is reasonable at locale.

Analysis and Design of Motor Drivetrain of Hybrid Electric Vehicles Based on DSPF2407a

　　Analysis and Design of Motor Drivetrain of Hybrid Electric Vehicles Based on DSPF2407a
　　Hybrid Electric Vehicles (HEVs) combine the advantages of conventional engine-driven vehicles and pure Electric Vehicles (EVs). This provides satisfied driving performance and lower exhaust emission. Thus, HEV is a feasible solution to solve the energy crisis and environmental pollution problems. Drive Motor being a main department of HEV, plays an important part in HEV development. So research and analysis on Drive Motor have a great significance.Cast Alnico Magnet The subject roots in a 863 major project of the country’s "Ten five" plan, named "Electronic automobile", which is a mixed power car project assumed by Chang’an automobile company.In this paper, the classification and associated characteristics of HEVs are firstly analyzed and discussed. And then, the configuration and operation modes of electric assist parallel HEVs are presented, in which both the weight and rate power of the drivetrain components are comprehensively considered.At first sets up PMSM math models, analyze and compare several kinds of current vector control methods, base on which arithmetic of the maximum power flux weaking are present. Current control strategies of PMSM are given.Then use the DSPF2407a of TM Company as the system controller, Mitsubishi IPM as the power module, and build the peripheral detection circuit of current and voltage, detection circuit of rotate speed\position, http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php drive circuit and guard circuit to form the system. This system also has the interface for CAN Bus.In the CCS programming environment, use C languages and assembly languages to actualize the vector control, PID control, PWM, communication and so on.Test PMSM performance under different working states.By analysis the test result, we find that the system not only has the high quality, it also has the excellence of small size and light weight. The system fulfill the demand of the manufacturer, and can accomplish industrialization.

AC PMSM Servo Technology

　　AC PMSM Servo Technology
　　Servo is a primary technology of modern industry. With developing of this years, alternating current servo has taken the place of direct current servo in many situations step by step, while three-phase alternating current Permanent Magnet Synchronous Motor is one kind of alternating current permanent magnet servo motor. Due to improvement of performance and falling down of price of permanent magnet and a series of advantagies, brought by Neodymium Magnets the substitute for field excitation winding in wound rotor, such as no heat generation of rotor, with a simple control system, higher efficiency and speed and so on, three-phase alternating current Permanent Magnet Synchronous Motor has been applied widely in such low power ways as numerical control machines, robots and so on.This paper introduces a alternating current permanent magnet AC digital servo system whose hardware is based on DSP (Digital Signal Processor) and IPM (Intellect Power Modular) and in which feed control was adopted in position loop to improve the performance. This system uses the DSP as the main controller, in which position loop, current loop and speed loop were implemented. In alternating http://www.999magnet.com/products/110-sintered-neodymium-magnets servo digital system DSP is the signal processor, Intellect Power Modular is inverter while rotation code device and current flow sensing element supply the feedback signal. The signal coming out from sensing element goes back to DSP to be calculated after disposals of wave filtering, shaping and so on. DSP adjusts the position loop, current loop and speed loop in servo system throughing the disposals of reference signal and feedback signal and outputs PWM signal, then servo closed loop control of motor will be realized after isolated driving IPM modular.

A Deadbeat Adaptive Position Control of PMSM

　　A Deadbeat Adaptive Position Control of PMSM
　　The position control of PMSM servo system will be discussed mainly in the thesis. Based on the vector control of PMSM, we design the deadbeat MRAC observer position controller. In direct drive motor systems, a load torque disturbances directly affects the motor shaft. The application of the load torque observer uses a fixed gain to solve this problem. However, the motor flux linkage cannot be determined precisely for a load torque observer. Therefore, an asymptotically stable adaptive observer base on a deadbeat observer is considered to neodymium prices overcome the problems of unknown parameters, torque disturbance and a small chattering effect.
　　To find the critical parameters the system stability analysis is carried out using the Lyapunov stability theorem. The results indicate that the controller has well dynamic and track performance. In this thesis, it mainly discussed about that:First, we will introduce the background of PMSM, the development general situation of PMSM and the position control research trends of PMSM. Then, based on the vector control of PMSM, we will introduce the mathematics model of the PMSM. We will simulate the position control of PMSM by Matlab.Second, a linear quadratic controller is used to solve the regulator problem resulting in a state variable feedback. A new state is defined for the tracking controller as z = y - y_r .To guarantee the time required for calculating the load torque to be less than the overall system response time and to compensate the load torque at transient state, a http://www.999magnet.com/products/142-neodymium-prices deadbeat observer is desirable. All poles of the observer is zero, the system will achieve steady situation in N step.Third, Even though the observer feedback gain is obtained by using the nominal parameter value, there is a certain variation or uncertainty of the parameter. To overcome this problem, an adaptive observer is considered. In this system, the reference model is the real plant with the augmented state variable feedback controller. We will introduce the Deadbeat MRAC observer. The system stability analysis is carried out using the Lyapunov stability theorem, and find out adaptive mechanism.At last, we will introduce the model of the position controller which based on the deadbeat observer and introduce the model of the position controller which based on the deadbeat MARC, and gain the simulate result. And then we will compare the difference of two methods. Finally we will analyze and summarize the results of the simulation.

Design and Research of Brushless DC Motor for Water Pump

　　Design and Research of Brushless DC Motor for Water Pump
　　With the increasement of conflict of energy supplying, extending saving-energy technology of water pump system has important economic and social benefit. The development of permanent magnet electrical machinery with high efficiency and high power factor supply new ways for water pump saving energy. There are rich rare earth resources in our country, which have many advantages to develop variable frequency speed control system. Based on analysis the energy saving principle of water pump, permanent magnet brushless DC motor(BLDCM) is Cast Alnico Magnet employed into water pump system in this paper. Several parts are included:1、 A driver for BLDCM with 7.5kW is designed based on TMS320F240, the main circuit of driver and detail control circuit are given. System software and corresponding architectures are designed. In the control loop of speed and current, fuzzy PI switch control with conbination of traditional PI and fuzzy control is used in speed loop. Dynamic response of system is improved through simulation and experiment.2、 Electromagnetic design of BLDCM for pump is analyzed and design procedure is improved considering the influence of inductance on motor.3、 Basis on the analysis of system frame and running characteristic of BLDCM, optimization method for system efficiency is presented. Different PWM modulate modes are proposed to reduce the loss of http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php driver and corresponding effects on motor are also analyzed. The influence of different commuting angles on motor efficiency is concluded and the optimal commuting angles is found.4、 The no-load electromotive force and load experiments of prototype are performed to validate design scheme and performance. Corresponding experiments of permanent magnet synchronous motor, induction motor and variable frequency induction motor are compared with BLDCM to testify validity of applying BLDCM into water pump saving energy.

磁悬浮平台的直线电机的电磁特性研究

　　磁悬浮平台的直线电机的电磁特性研究
　　Magnetic suspension platform is a novel filed whose drive problemis a key point in this filed. The linear motor is the first choice for thedriver of the magnetic suspension platform because of its high reliability,advanced dynamic response and varying structural style. This paperresearched deeply on ironless moving coil linear permanent magnetsynchronous motor which used for driving the magnetic suspensionplatform, in the hope rubber magnetic sheet of offering gist for the control of this platform. Atlast, analyzed the air-gap magnetic field of three types of tubular linearPM motors. The main research contents of the paper are as follows:First, the analytical formulas are derived by distributed-currentmethod to determine the magnetic field due to PM. According to the lawof F=BIL, the formula to calculate the thrust of ironless moving coillinear PM synchronous motor is obtained. Then determined the staticcharacteristic of thrust to displacement.Second, the air-gap magnetic field of the ironless synchronous linearPM motors is analyzed with Ansoft Maxwell 2D Software pack. Based onthe research of air-gap magnetic, researched the static thrust of the linearmotor. Found out the thrust characteristics according to designparameters.Third, researched on the air-gap magnetic field of three http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php types oftubular linear PM motors and find out the characteristics of air-gapmagnetic field each motor, which can be used to choose and design themover of the PM linear motor.Last,-tested air-gap magnetic field and flux leakage of the ironlesssynchronous linear PM motors. Compared the tested result with Maxwellanalysis result, verified the exactness of Maxwell analytic result.

Study on Drive and Control System of Sensorless PMSM Based on Sliding Mode Observer

　　Study on Drive and Control System of Sensorless PMSM Based on Sliding Mode Observer
　　In recent years, the sensorless control technology of the PMSM (Permanent Magnet Synchronous Motor) has developed rapidly with the fast development of power electronics technology, micro-electronic technology and modern control theory. The speed regulation system of PMSM without sensor not only has a simple structure, high efficiency, Block Ceramic Magnets excellent performance and easy maintenance, but also has a small volume, low cost, high reliability and some special application. This paper, on the background of application of PMSM in the Frequency Air-conditioners, applying the method based on SMO(Sliding Mode Observer), has researched and accomplished the sensorless vector control of drive and control system of the sinusoidal PMSM.Firstly, the sensing method of the rotor position of PMSM is analyzed in detail. After that, an estimated method based on SMO is designed and completed, which has a strong robustness, simple control algorithm and easy implementation of engineering application.
　　On the basis of analyzing the mathematical model and vector control principle of PMSM, the system model of the sensorless control of PMSM based on SMO is established, which provides a theoretical basis for carrying out simulation and experiment. At the same time, the drive and control system of sensorless PMSM based on SMO is designed. The system design includes hardware circuit design and software program module design.Finally, the drive and http://www.chinamagnets.biz/Ceramic/Block-Ceramic-Magnets.php control system of sensorless PMSM based on SMO is researched by simulation and experiment. Using the MATLAB/Simulink software, the simulation of the system is carried out, and the simulational results verify the availability of the method of sensorless control. Then, the drive and control system is experimentized on the experimental platform of sensorless PMSM system based on TMS320LF2407A DSP(Digital Signal Processor). The experimental results agree with the simulational results well, and testify the system performance meets the design requirements.

Influence of Permanent Magnetic Field on Liquid-liquid Extraction Process

　　Influence of Permanent Magnetic Field on Liquid-liquid Extraction Process
　　In this paper, in order to study the effect from magnetic fields on the process of extraction with different magnetic flux intensity B magnetic fields and different temperature T, ethanol-water-benzene system,acetic acid-water-benzene system,chloroform-water- acetone system were employed to be magnized. It indicates that magnetic fields doesn’t work on the liquid-liquid equilibrium of acetic acid-water-benzene system, the partition coefficient of acetic acid Alnico Magnets doesn’t alter regularity. But the negative effect of magnetic field exists in the extraction process of ethanol-water-benzene,chloroform-water- acetone system. The partition coefficient of ethanol and acetone decrease with the increments of magnetic induction intensities.Based on experiment data, the equation of liquid-liquid equilibrium including magnetic flux density B is put forward. At the same time, dependability is proved by analyzing the fitted results.The experimental data were analysed and distributive coefficient of solute http://www.999magnet.com/products/108-alnico-magnets A were obtained in the different condition. And by the method of regression anylysis, relations of distributive coefficient of solute A and magnetic field intensity B were studied and correlations equation of partition coefficient and magnetic field intensity B were obtained.

Fuzzy Adaptive Control of the Linear Elevator

　　Fuzzy Adaptive Control of the Linear Elevator
　　Recent years, there are more and more super-skyscrapers with the rapid development of society. The elevators that are indispensable in super-skyscrapers developed more and more quickly. The severe challenge of traditional rope lifting system had been proposed because of super-skyscrapers development. So it is important that to design the new lifting system, and the elevator driven by linear motor is put forward.The linear motor is drive device that can change electric energy into linear motion mechanical energy. It can be used in many occasions that rotary motions are transferred into linear motions. The middle institution can be omitted thus the whole institution can be simplified. There has been a decrease in the work of the whole system maintenance and Neodymium Magnets repair, an increase in system reliability, and easy controlled. The whole system efficiency can be improved in suitable situation. Therefore the linear motor will be widely used in so many fields such as transportation, industry, and national defense.
　　The linear elevator is one point.This article adopts permanent magnet linear synchronous motor drive elevator. And the primary of permanent magnet linear synchronous motor is fixed in the hoist, and permanent magnet body is fixed on the cab. But as the iron core of permanent magnet linear synchronous motor is broken there will be ending-effect. Vertical ending-effect can cause the linear motor thrust ripple and then influence the elevator sense of comfort. This article put forwards the control method of adaptive-fuzzy-PID, which is applied to permanent magnet linear synchronous motor drive elevator system.Fuzzy control method has strong robust, and is a non-linear control method. This control method has a less dependence on target models and is suitable for uncertainty system and http://www.999magnet.com/products/110-sintered-neodymium-magnets non-linear system control. But fuzzy control also has defect, such as the fuzzy rules are obtained by experience and expert knowledge. This cannot ensure that the rules are optimal and affect the control quality. So fuzzy control develops towards adaptive control. Adaptive control can adapt to the variation of object and disturbances through modifying its character. The adaptive-fuzzy-PID combines the advantages of adaptive control and fuzzy control. This method is not restricted by the mathematics model and has the ability of adaptability. It can inhibit the vibration because of linear motor end-effect and achieve the control purpose. The elevator will operate smoothly and comfortable. The elevator operation efficiency can also be improved. The simulations show that the adaptive-fuzzy-PID control method can response quickly and has good tracking ability. The system can become stable quickly when there are disturbances. So the elevator cab will become more comfortable and suitable for people.

The Research of Sing-Phase High Efficiency Motor

　　The Research of Sing-Phase High Efficiency Motor
　　This paper is mainly about high efficient single phase motor, including high efficient single phase induction motor and single phase permanent-magnet synchronous motor. The details are as follows:First, high efficient single phase motor is studied. The loss of single phase induction motor is analyzed, considering that the copper loss of single phase induction motor is high, a new winding, which is different with sinusoidal winding, is adopted, the principle of the new winding is generalized, the rate of slot full of the electric machine which adopts the new winding is increased, and the copper loss is decreased efficiently. The airspace harmonic magneto-motive neodymium prices potential of the electric machine which adopts the new winding and the tooth harmonic of electric machine are analyzed.
　　The symmetric operation of the double value capacitor single phase induction motor, the turns ratio of main phase winding to the auxiliary phase winding, the value of capacitor-start and capacitor-run, and the influence on the efficiency of electric machine when the running capacitor and the turns ratio are adjusted, are analyzed in this paper. In the end, CAD software is finished according to the characteristics of the single phase induction motor.Secondly, the single phase permanent-magnet synchronous motor is studied. The magnetic circuit of the single phase permanent-magnet motor is selected. The point of this paper is the research in the load characteristic of the single phase permanent-magnet synchronous motor. The variables of electric machine are changed into positive-order component and negative-order component by changing the windings and the weigh component, and then the http://www.999magnet.com/products/142-neodymium-prices positive-order component is decomposed to dq-axis component and the load characteristic of electric machine is calculated and the voltage iteration flowchart is accomplished. The property of d-axis armature reaction of the electric machine is analyzed.Finally, prototypes of this two kinds of electric machine are designed and the detailed experiments are carried out, after generalizing the experience the development and the experiments of the single phase motor. The performance indexes of the electric machines have reached the prospective requirements, the efficiency of the the single phase induction motor is 67.4% and the efficiency of the single phase permanent-magnet synchronous motor is 76.6%, and the experiments results are presented in this paper and are compared with common induction motor.

稀土永磁无刷直流鱼雷推进电机控制系统设计研究

　　稀土永磁无刷直流鱼雷推进电机控制系统设计研究
　　The dissertation discusses the key-technology about a control system project which applied to a large power capacity rare earth permanent magnet brushless DC motor(BLDCM),designs the hardware and software of the BLDCM control system.The dissertation discusses the stepless speed-adjusting technic about torpedo drive motor, and the developing state of BLDCM .Considering the feature of the torpedo driver motor and the engineering application,we design.the system scheme, the hardware of BLDCM Then, analyzes the operational principles of BLDCM and the PWM speed-adjusting theory.Additional, analyze the operational theory of the 2-phase feed neodymium standard state up, all bridge star style 3-phase 6 states BLDCM system with 3 pair poles, then,set up the steady and dynamic mathematics model of BLDCM system.Basing on key-technology issues which are faced in the course of BLDCM control system,? torque ripple:we analyse the torque ripple due to the exchange phase and the effect of the pulse Width Modulation , we present a method to compensate torque ripple, which is directly faced torque ripple. (2) optimal commutation : we analyze the armature reaction that act up on air gap magnetic potential , the back electromotive force(BEF) of the phase windings http://www.999magnet.com/products/112-neodymium-standard-state and the optimal inversion position , and propose a new dynamic implement method . Based on the above research, we design the hardware of a control subsystem :such as PWM singal assistant circuit,BLDCM rotor position detect circuit.Based on the hardware design , we propose that the control-flow analysis, and main loop flow, and the DSP implementation method of the rotation speeds closed loop of PI controller, PWM mode, optimal versus logistic commutation ect. which use the TMS320LF2407A.

The Direct Torque Control of Brushless DC Motor Based on Position Sensorless Control Method

　　The Direct Torque Control of Brushless DC Motor Based on Position Sensorless Control Method
　　Permanent magnet brushless DC motors (BLDCM) have been more and more widely used in industry applications because of their advantages such as higher ratio of power to volume, lower noise and easier maintenance compared to permanent magnet DC servo motors. However, the existence of rotor position sensor makes the application of BLDCM in some area impossible. In addition, because of various reasons, the torque ripple generated by BLDCM is inevitable. Alnico Magnets So, the position sensorless control method and the torque ripple prohibit scheme become the focus of BLDCM and researched by a lot of researcher.The direct torque control (DTC) is a high performance control method which proposed in 80s, last century, in AC motor speed control area. This method has a lot of advantages such as simple control structure, good dynamic and static performance, rapid torque response and strong robust.
　　The DTC observes the fluxlink and torque of the motor in the stator coordinate, and compares the observed values with the set values to obtain the error. And then the control signal is obtained by inputting the error to the controller. Finally, with this control signal and the state of fluxlink, the corresponding voltage space vector is selected, so that the torque can be controlled directly. Actually, the DTC is a torque feedback control method that can control the torque well and rapidly, which make the DTC a very prospective method to prohibit the torque ripple of BLDCM. So in this paper, the DTC is used to control the BLDCM, in the purpose of reducing the torque ripple.Besides, in this paper, the research about the application of DTC in BLDCM under the position sensorless control method is did, in order to decrease the torque ripple of BLDCM which controlled by the http://www.999magnet.com/products/108-alnico-magnets position sensorless control method. And then the back electromotive force (BEF) method is used to perform the complex control of DTC and position sensorless control. But the BEF method can not start up the motor. To solve this problem, on the base of the work did by other people, a improved start method combined with the DTC is proposed in this paper, so that the motor can start up successfully.Finally, the BLDCM hardware control system based on the MSP430F149 MCU is introduced. And the experiment is carried out in this system, and then the experiment result is given.

Direct Torque Control for Permanent Magnet Synchronous Motor Drive Based on Voltage Space Vector Pulse Width Modulation

　　Direct Torque Control for Permanent Magnet Synchronous Motor Drive Based on Voltage Space Vector Pulse Width Modulation
　　With more and more advanced requirements of social practicality production, the varieties of motor are gradually increasing and the control technologies of modern motor have also been upgraded. Permanent magnet synchronous motor (PMSM) has been widely used in high performance drive applications for its advantages, such as compactness, high efficiency, reliability and suitability to environment. Direct torque control (DTC) which was initially Cast Alnico Magnet applied to induction motor drives has been paid more attractions and dramatically developed with its novel control means, compact system structure and excellent dynamic and static state performances. DTC technology for PMSM drives, however, is not perfect and has some disadvantages. For example, the electromagnetism torque ripple and the low performance of low speed are all very intractable problems, which often lead to the torque and flux ripple and can not obtain optimal control effect.
　　To solve all above problems, the space voltages vector pulse width modulation (SVPWM) strategy of DTC for PMSM is presented. Simulation results show that it can dramatically reduce the torque and the stator flux linkage ripples and it has better dynamic and static state performances, and its fast response, so its function will more stable.Firstly, based on the state of the art review of DTC, the basic theory of coordinate transformation in motor control and mathematical model of PMSM are introduced, and at the same time, the principles of the basic DTC and voltage space vector pulse width modulation (SVPWM) are presented. The control arithmetic of SVPWM http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php and simulation results are given.Secondly, according to above theories, to solve the problem of the torque and the flux ripples in the DTC system, this paper presents an improved scheme which is based on the space vector of stator voltage pulse width modulation strategy of DTC for PMSM. The simulation model of system is built by the means of MATLAB/SIMULINK. The proposed system is compared with the basic DTC in the aspects of steady state and dynamic state. The simulation results prove the feasibility and advantages of this scheme. Finally, after reviewing many papers about DTC, some problems associated with low speed performance of DTC system are concluded in the paper, and at the same time, several improved methods are proposed. Then how the stator resistance variation affects the system performance is analyzed in the paper. According to above analysis, the stator resistance estimator is proposed to solve the bad effect for the system with the stator resistance variation. Modeling and simulation results further confirm the effectiveness of the proposed stator resistance estimator.

Permanent Magnet Synchronous Motor Servo System and Its Application in the NC Machine Tools

　　Permanent Magnet Synchronous Motor Servo System and Its Application in the NC Machine Tools
　　With the wide application of Permangent Manget Synchronous Motor(PMSM) in many fields, the PMSM servo system have already become the research focus in the field of electric automation.This paper uses TI’s TMS320F240 DSP as the central control unit, combining with intelligent power module as the main circuit, adopting rotor magnetic field oriented vector control strategies to realize the control on servo system, and forms the client mutual communication interface servo system through liquid crystal display and keys of the remote panel.Firstly, this thesis makes an introduces on the developement of PMSM servo system based on DSP. According to Alnico Magnets the control theory of AC PMSM servo system, this paper analyzes the coordinate transformation, the rotor magnetic field orientation and the current control strategy of AC servo system. The control strategy is i_d=0. The system is orientates towards rotor magnetic field. Then the mathmatic models of PMSM in d-q coordinate are set up. Secondly, the paper presents the hardware and software design plan of PMSM digital AC servo system. It analyzes and designs the control circuit, the main loop circuit and the interface circuit. In addition, in order to make it easy to modify the control parameters and display the running state of sytem, the remote panel is designed to be special-purpose on PMSM servo system and it can achieve favorable interactive operation. The software is mainly composed of initial program, main program and timer underflow interruption sevice routines. The important control strategies such as current sampling, speed http://www.999magnet.com/products/108-alnico-magnets and position sensing, vector coordinate transformation, PI regulators, SVPWM vector modulation and so on are all accomplished in the timer underflow interruption service routines. The software of remote panel uses assembly language to realize communication with the system.Finally, The simulation of control system which had been used in NC machine tool driving control was set up by use of Matlab/Simulink. The simulation results including steady-state abrupt change of load and the starting operation with load were given. These waves indicate the PMSM servo system has a satisfying static and

Research on Permanent Magnet Synchronous Motor Used as Air Conditioner Compressor

　　Research on Permanent Magnet Synchronous Motor Used as Air Conditioner Compressor
　　Presently, induction motor is mostly used for frequency-change air conditioner compressor, but it has such drawbacks as low efficiency and complicated controller. Compared with the induction motor, PMSM (permanent magnet synchronous motor) has advantages as high efficiency and energy-saving, compactness and premium properties for speed adjustment. So PMSM is perfect substitute for the driving motor of the conditioner compressor. Different arrangement of magnet has different distribution of flux; it will affect the performance of the motor. So it is Neodymium Magnets meaningful to contrast the performances of PMSM which has different structure of rotor.The distribution of the air-gap magnetic field influence many performances of the PMSM. And the magnetization of PM (permanent magnet) and the magnetic pole shape of the rotor determine the air-gap magnetic field. In order to improve the dynamic performance and minimize torque ripple, this paper investigates the post-assembly magnetization of PM and the optimization of magnetic pole shape of PMSM.Firstly, it has selected five different representative structures of the rotor which are used in air conditioner compressor and designed motors with same stator parameters. The FEM (finite element method) model is established and calculated. Then the performances of the motors which have different structure of rotor are contrasted. The motor which has optimum performance is selected. Then on the base of theoretical analysis of magnetic path of post-assembly magnetization, post-assembly magnetization of five motors which have different http://www.999magnet.com/products/110-sintered-neodymium-magnets structures of rotor is operated using one phase winding. The results of the magnetization are contrasted.According to the contrastive results and practical situation, the motor which has relative premium properties is selected. Then rotor structure and parameters are same, fractional slot winding is used. Performance of the motor which has fractional slot winding is compared with the original motor’s. Simulation result proves that torque ripple is considerably reduced.Lastly, it optimizes magnetic pole shape to minimize the torque ripple

Thrust Ripple Analysis and Control Model Research on Permanent Magnet Linear Motor

　　Thrust Ripple Analysis and Control Model Research on Permanent Magnet Linear Motor
　　Based on the Liaoning Province Natural Science Foundation project named "Research of Control Methods ffor High Speed and High Precision Linear Servo System (No. 20022037)", the characteristic of permanent magnet linear servo motor (PMLSM) used for NC machines has been analyzed. In order to restrain the thrust ripple of PMLSM, the primary and secondary structures have been designed and analyzed based on electromagnetic field theory, DSP is used for designing the control system of PMLSM.The end and cogging effect are the main reasons for thrust ripple of PMLSM.
　　The new structure scheme of PMLSM based on permeance modulated theory is brought forward, which is based on fractional-slot theory to neodymium prices realized the purpose of short pitch and distribute, this scheme can make the technics simple and the thrust ripple decrease. Using ANSYS which is a software of FEM to analysis the magnet field and thrust of PMLSM can prove this method is very effective to reduce thrust ripple, the experiment also testified the availability of this method.Using the self-shield characteristic of Halbach array to boost up the air gap magnetic field of PMLSM, the optimize design based on Simulated Annealing Algorithm (SAA) is used to trapezoid Halbach array permanent magnet. The result proved that this structure can not only increase thrust density but also effectively restrain thrust ripple. For PMLSM used chinaware pedestal, it can leave out the secondary iron yoke to reduce its volume and weight. The optimized structure can more reduce thrust tipple, http://www.999magnet.com/products/142-neodymium-prices which provides ideal condition for precision machining and high dynamic response of servo system.Based on vector control theory, TMS320LF2407A is used for constructing servo system model of PMLSM for NC machines and IR2130 is used to drive IGBT, which can improve control precision through both speed and current closed loop. The hardware is reasonable and has self-protection function. The software can realize the function of sample current, compute speed, transform coordinate, Space Vector Pulse Width Modulate (SVPWM), etc. This system has the characteristic of high precision and strong real time, which can make PMLSM satisfier the demand of high precision machining.

Research on Digital Dual-redundancy Permanent Magnet Synchronous Motor Speed Control System

　　Research on Digital Dual-redundancy Permanent Magnet Synchronous Motor Speed Control System
　　With the development of the electrical transmission system, the DC motor has played an important roll because of its easy controlling. With the development of AC motor, the AC motor system is increasingly wide used for the military and civil usage. For example, in the field of aviation and electrical equipment such as air conditioners and refrigerators, the AC motor system is occupying the dominant position.In many electrical systems, in order to enhance the ability of fault resistance and safety, redundancy technology is one of the effective means. Currently Cast Alnico Magnet the brushless DC motor for steering system has been extensively studied. And similar to brushless DC motor, the permanent magnet synchronous motor also has high power density, low loss, fast response characteristics. And because of the better performance than brushless DC motor, such as small positioning error, small torque ripples; it has irreplaceable advantages in high-precision occasions.This paper studies dual-redundancy permanent magnet synchronous motor speed control system. First introduce the control strategy of dual-redundancy motor system, based on the characteristics of permanent magnet synchronous motor. The system models were established in the MATLAB / SIMULINK; the current and speed closed-loop model were simulation in different patterns. In analysis of the space vector modulation theory, http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php we propose a new method, compared to the traditional space vector modulation method does not need division sector, which simplifies the sector computing, in particular the algorithm in Digital control of the space vector is simplified. Finally we analysis the key technologies of redundancy system.The hardware is established based on DSP2407 core with CPLD. The software corresponding to the different patterns based on the DSP assembly language. The experimental results show that the theoretical analysis in this paper is correct and dual-redundancy permanent magnet synchronous motor system is feasible.

Design Optimization of Permanent Magnet DC Motors by Combining Calculation of Field and Circuit

　　Design Optimization of Permanent Magnet DC Motors by Combining Calculation of Field and Circuit
　　Due to the advantages of simple structure, small volume and high efficiency, permanent magnet direct current motors(PMDCMs) are applied widely in all fields of national economy. With the development of new structure, new material and new technology, the magnetic circuit structures of PMDCMs become more complicated and the traditional design method based on the magnetic circuit calculation can not ensure the design accuracy. So, the analysis and design optimization of PMDCMs are carried out with the idea of combining calculation of electromagnetic field and circuit in this thesis. The main work and achievements are as follows.Firstly, the electromagnetic field finite element models of PMDCMs are built up. Four main coefficients, including leakage flux coefficient at no load, airgap Neodymium Magnets coefficient, equivalent armature length and equivalent pole arc coefficient, are calculated respectively and the pole arc coefficient curves of PMDCMs with eccentric poles are given. Secondly, a new method to calculate the cogging torque is proposed. The validity of the method is verified by the test data. Thirdly, the effects of reducing cogging torque of PMDCMs with poles chamfering are researched by the new method. The results show that the cogging torque may reduced 79% at the optimal magnetic poles chamfering. Fourthly, the influences on armature reaction for PMDCMs with eccentric magnetic poles are calculated. The results show that the distortion factor of airgap magnetic field and the maximum voltage between the commutator bars can be reduced by eccentric magnetic pole. But eccentric http://www.999magnet.com/products/110-sintered-neodymium-magnets magnetic pole can not decrease the airgap flux density at commutation region. Finally, the design optimization model of PMDCMs is built up and an optimization software is developed by using particle swarm algorithm. The optimal results are obtained with the lower cost or higher efficiency.The research work is valuable at the aspects of improving the calculation accuracies of parameters and performances, investigating the effects of reducing the cogging torque and armature reaction with different permanent magnetic structures, as well as improving the performance and decreasing the cost of PMDCMs.

The Design of Large Thrust Permanent Magnet Linear Servo Motor and Driver

　　The Design of Large Thrust Permanent Magnet Linear Servo Motor and Driver
　　With the development of modern advanced numerical control(NC) machines,the performance of the linear servo feeding system is more and more important and the research of direct drive of permanent magnet linear servo motor(PMLSM) is meaningful. Based on Finite Element electromagnetic field theory,the reason of thrust ripple of large thrust PMLSM used in NC machines is analyzed and the electromagnetic field and thrust ripple of PMLSM is calculated.The electromagnetic design and mechanical design is based on calculation.TMS320LF2407A is used for designing the control system of PMLSM.The end and cogging effect are the main reasons for thrust ripple of PMLSM,the Samarium Cobalt Magnets end and cogging effect is serious for large thrust PMSLM,the thrust ripple is serious too.For reducing the thrust ripple of PMLSM,the paper uses the design method of permeance modulating,the primary of motor uses open slot,both cogging permance and ending permance are modulated,causing the synthesized wave proportionally distributing in odd numbers of permanent magnet pole.The method of permeance modulating is applied in the design of permanent magnet linear servo motor,and conflating the theory of fraction-slot, which can reduce the thrust ripple caused by the ending effect of PMLSM effectively.In addition,considering of the request of production process of PMLSM,according to http://www.chinamagnets.biz/Samarium%20Cobalt/Samarium-Cobalt-Magnets.php production characteristics of large thrust PMLSM,mechanical design of motor is designed.
　　The cooling system uses the water cooling system,simultaneously considering of mechanical processing very well.The winding of primary motor uses single tooth and concentrated molding coils,having short distance and distributive effect,also having the characteristic which is well craft,short ending of windings,highly density of thrust.Based on vector control theory,TMS320LF2407A is used for constructing control system model of PMLSM used in NC machines and PM30CSJ060 is used to drive PMLSM.The circuit of control system of PMLSM is quite perfect.Software frame of vector control system of PMLSM is formed;it provides the foundation of hardware and software for developing advanced control algorithm after.

Research on Robust Sliding Mode Control for Ring Permanent-Magnet Torque Motor Used in Compound A/C Axe

　　Research on Robust Sliding Mode Control for Ring Permanent-Magnet Torque Motor Used in Compound A/C Axe
　　The direct drive technology has entrusted with the excellent performance for the compound A/C axis, has superiority over indirect drive which is unable to compare. The compound A/C axis that combined ring permanent magnet torque motor with the direct drive technology can complete precise, high speed and a reliable processing. Based on the project supported by National Natural Science Foundation of China "Study on Numerical Control(NC) Machine Tool Rotary Feeding Precision Direct Drive Technique and Its Control Strategy" (No.50375102), for the characteristic of compound A/C axis ring permanent magnet torque motor direct drive, and for the request of tracking neodymium standard state performance and robust, the second order sliding mode, robust control is combined with other control methods and three control strategies are proposed to enhance servo performances of the direct drive system in this dissertation.Firstly, the compound A/C axis ring permanent magnet torque motor direct drive servo system mathematical model is established.Secondly, higher order sliding mode theory is expatiated. The reason of weakening chattering is introduced particularly. The keystone and some algorithms of second order sliding mode is introduced.
　　The speed controller is proposed that controlled by super twisting algorithm of second order sliding mode in allusion to continues time system. The higher order sliding mode theory is introduced. The position controller is proposed that controlled by prescribed convergence law algorithm of discrete time second order sliding mode.Then, linear matrix inequality and common lemma are introduced. The method which combined robust control theory and sliding mode http://www.999magnet.com/products/112-neodymium-standard-state control theory is adopted. In sliding mode system, systems subject to matched or unmatched model uncertainties in the presence of external disturbances. A linear matrix inequality is adopted to design robust controller which is based on formula. Choosing ring permanent magnet torque motor drive directly compound A/C axis swing head, in order to complete the fundamental research of compound A/C axis ring permanent magnet torque motor direct drive servo system.Finally, Type RM166/100 ring torque motor produced by Germany CyTec Company is considered as the controlled object, its mathematical model is established, and it is necessary to simulate and analyze above three control strategies using MATLAB software. Theoretical analysis and simulation results show that the designed method enables servo system to have strong position-tracking and speed-tracking performance, and have very strong robustness against load disturbances, parameters varieties and other uncertainties, and chattering phenomenon is reduced.