The Stiffness Analysis of Direct Drive NC Machine Tool Rotary Table Servo System

　　The Stiffness Analysis of Direct Drive NC Machine Tool Rotary Table Servo System
　　In order to meet requirements of the high speed cutting and high precise cutting technology, a new "zero-transmission" direct drive rotary table feed system driven by PMSM had been developed. Compared with conventional worm gear rotary table system, the direct drive PMSM rotary system has outstanding characteristics, such as the simple structure ,high acceleration, and high position accuracy. This new rotary table neodymium standard state
http://www.999magnet.com/products/112-neodymium-standard-state feed system is being used by more and more engineers who develop the new NC machine tools.In order to maintain the processing quality when they suffers disturbs from cutting force and make the machine tools have enough processing precision, exploit the high response characteristics of direct drive PMSM servo system in machining process, the servo control system must achieve tracking performance as high as possible a well as good dynamic servo stiffness.The dissertation mainly discusses the servo stiffness of direct drive NC rotary table servo system. Firstly, the merit and the shortcoming of the direct http://www.999magnet.com/products/112-neodymium-standard-state drive and the indirect drive are compared and evaluation method is brought foreword since the servo stiffness of the direct drive servo system take on new features. Secondly, the models of this control system and servo stiffness are given. A simulation is performed using software MATLAB to evaluate the influence of control structure 、 control parameters and mechanical characteristics on the dynamic stiffness direct drive servo system. In the fourth chapter, we infer an adaptive H_∞ controller and make simulations for this control system.

Study on Central Controller of the Electric Control System of 750kW Adaptive and Direct-driven Wind Turbine

　　Study on Central Controller of the Electric Control System of 750kW Adaptive and Direct-driven Wind Turbine
　　As green energy, wind power is the most promising renewable energy that is being developed on large scale at present in American and European countries. According to investigation for market, the 750kW Wind Turbine is welcomed very much now. It is designed for a central controller of the electric control system of the 750kW Adaptive Pitch and Direct -driven Wind Turbine in thesis.At first, contrast analyses are offered for the connected grid characteristic of synchronous generator and asynchronous magnetic materials
http://www.999magnet.com generator in detail. Grid connection adopted by frequency converter is necessary for variable speed operation of the large scale wind turbine generator, on the basis of which advantages and disadvantages are given for grid connection run of direct -driven generator of permanent magnet, it is presented that configuration of control system;According to basic theory on wind turbine, it is best means that utilization ratio is enhanced through technology of both variable speed and adaptive blade pitch, which is mainly developing tendency from now on.On the basis of the requirement that is safe control and unattended operation for wind turbine for 24 hours, several staring type of wind turbine generator and yawing control strategy are explained at length as well as stopping type. All kinds of function finished by central controller are expounded in thesis.
　　Based on requisition of electric control system, input and output signals of central controller are analyzed ,then model and hardware configuration are determined, on account of programming concept of modularization, it is designed that flow chart of principal program, flow diagram of yaw system and flow chart of variable blade pitch control, http://www.999magnet.com homologous measurements of safe protection are offered .Especially, it is analyzed that control process of variable pitch system in detail, hydraulic principle graph and control principle chart of proportional valve are offered, FB41 in STEP7 called soft PID is adopted to control variablepitch system, simulating curve graph is presented in thesis;Secondly, it is analyzed that soft ware of FM350-2 counting function module, programming flow chart and application method are given;It is expounded to design HMI by ProTool and to build connection between upper monitor computer and PLC by PRODAVE. Finally, it is discussed to offer reliability design for central controller based on both hardware and software.

The Research and Design of Noncircular Cross Section Turning Open Architecture Numerical Control System

　　The Research and Design of Noncircular Cross Section Turning Open Architecture Numerical Control System
　　Roller is one of the important parts and main distortion tool of rolling mill. The precision and size precision of the roller influence the quality of rolling directly. Therefore, it is the essential technology of steel rolling technology to processes satisfied roller. Along with the tendency of complication of roller processing’s surface outline day by day, the multi- change of processing curve outline circular, as Neodymium Magnets
http://www.999magnet.com/products/110-sintered-neodymium-magnets well as the enhancement of the roller outline precision, the tradition machining processes can not adapt to high effective, high accuracy, changeful machining request under the market condition.With the constant development of science and technology, the numerical control system is more and more good.
　　The numerical control device is developed from enclosed architecture to open architecture gradually too. It’s characteristic of high speed, high efficiency, high accuracy, high dependability and convenience of modularization, intellectualization, flexibility and integrated make it become more and more important. At present only a few countries have this numerical control automation(soft template) machining technology of the roller non- circular cross-section turning, domestic study is still in groping stage in this field, therefore, developing the numerical control automation machining research of the roller noncircular cross-section turning have important theory significance and practical value.The main achievement and conclusion of this research:(1) Designed the collectivity frame of open architecture numerical control system. Achieved the hardware designing and collocating of open architecture numerical control system of non- circular cross-section turning.
　　(2) Thorough researched to the spindle velocity modulation system of vector frequency conversion. Chose http://www.999magnet.com/products/110-sintered-neodymium-magnets  high capability spindle motor and high resolving power feedback part, achieved detached control to rotate speed and torque of spindle, this can cooperate with feed servosystem to high precision achieve soft template technology of non-circular cross-section turning.(3) Chose permanent magnetism synchronization linear motor as fasting tool servo of non-circular cross-section turning. Feed servo control adopted PID control integrating withthe velocity and acceleration feed-forward control arithmetic, it can availably improve response precision of system and reduce servosystem follow error. (4) Established the open style numerical control system software, this control software is made by adopting modular structure and using VC++ language under the windows system. Designed data fitting module, automatic solution module, noncircular cross-section turning soft template module and PLC module and so on. In this software, has carried out the automatic machining of the roller noncircular cross-section turning and soft template of the noncircular cross-section turning.This research conclusion provided favorable theory foundation and practical data for more research of open style numerical control system of on- circular cross-section turning.

The Design of BLDCM for Wheeled Robot

　　The Design of BLDCM for Wheeled Robot
　　Permanent magnet brushless direct current motor(BLDCM) has good characteristic such as small inertia、easily controlled、dynamic function well, therefore it has got extensive use in many field such as aerospace, robot, numerical control machine tool. The BLDCM have already successfully applied to higher system request occasion abroad, and in recent years, it also arouse extensive attention homeland. The subject aimed at the wheeled robot, has designed the BLDCM and corresponding control system.First, this subject analyze BLDCM composition structure, winding magnetic materials and compare three-phase BLDCM star working with angle working,according to BLDCM two kinds pattern operation, multipolar fraction slot carries out part design. At last this part refer with the climbing, through many times arithmetic calculation gained initial design scheme.Secondly, for improving the reliability and cost, this subject use Maxwell RMxprt and Maxwell 2D finite element method analysis soft to analyze and verify the design scheme in order to check-up whether the simulated result parameter or not be identical with the design scheme.Finally, this subject designed the PIC control system and simulated BLDCM system. Control system CPU adopt the PIC16F877 monolithic machine, it is able to provide the optimum function price ratio. System adopt the IGBT special grid electrode drive http://www.999magnet.com integrate circuit IR2130 to control host circuit. System simulation adopt the MATLAB / SIMULINK software to check up designed motor function in system.Conclusion, the subject include five part: Analysis of connection of winding in BLDCM, designing initial data scheme, Maxwell carrying out verification on electromagnetism design, designing PIC monolithic machine controls system, applying MATLAB carries out system simulation. Through above five part, this subject have accomplished the wheeled robot with BLDCM design and control system design.

Research on In-Situ Sm2Fe17N3/Fe3Pt Compound Material

　　Research on In-Situ Sm2Fe17N3/Fe3Pt Compound Material
　　Nano-composite permanent magnet is a new type of rare-earth permanent magnetic material developed recently.This magnet consists of magnetically hard-phase and magnetically soft phase coupling in nanometer and posses the potential for high coercive force and high remanence as well as excellent magnetic properties.Up to now,many ways such as melt spun,mechanical alIoying(MA) and hydrogenation disproportionation desorption recombination(HDDR),Block Ceramic Magnets powder metallurgy,Reduction and diffusion was used to obtain the magnets,whereas the magnetic properties can not reach the theoretically predicaion calculation.Microstructure,crystal grain size as well as degree of magnetically hard-phase and magnetically soft phase coupling had an immediate effect on magnetic properties.Sm2Fe17N3/Fe3Pt is produced by melt-spinning and in-situ nitrogen technics.The structure and magnetic properties are analyzed by means of X-ray http://www.chinamagnets.biz/Ceramic/Block-Ceramic-Magnets.php Diffaaction,TEM,SEM and TG-DTA etc.The result of experiment indicates that,Sm10Fe86.3Pt3.7,Sm9.2Fe84.8Pt6,Sm8.1Fe83.8Pt8.1 melt-spun alloys include inα-Fe,Pt5Sm and Sm2Fe17 and Sm12.8Fe68.6Pt6 melt-spun alloy include in Sm2Fe17,α-Fe,Pt5Sm and Fe3Pt.The SmFePt nitride includes inα-Fe,Sm2Fe17N3 and Fe3Pt.Pt5Sm will break down during nitriding.Pt andα-Fe compound Fe3Pt whenα-Fe was separates from Sm2Fe17 alloy.We have produced successfully exchange coupled Sm2Fe17N3/Fe3Pt nanocomposite material.The microstructure doesn`t accord with ideal model of exchange coupled magnet material,So Sm2Fe17N3/Fe3Pt nanocomposite material has low Hci,Ms and Mr.In addition,the volatilization of element Sm result in a mass ofα-Fe.

FeNi磁温度补偿合金的研究

　　FeNi磁温度补偿合金的研究
　　Magnetic temperature compensation alloys are widely used in permanent magnetic circuit for stabilizing the magnetic flux in the air-gap. In this thesis the magnetic temperature alloys used in temperature range from room temperature to 160℃, were prepared by vacuum melting. The influences of doping and heat treatment on the magnetic temperature performances of the alloys were systematically investigated. The best doping compositions and the best heat treatment parameters were obtained. Finally, the temperature compensation characteristics of the alloys were verified experimentally in the Block neodymium magnet SmCo magnetic circuit and by the finite element simulations.Fe64Ni36 magnetic temperature compensation alloy was prepared by vacuum melting technique. The influences of doping elements Mn, Cr, Mo and Co on the properties of the alloys were investigated.
　　The results show that both the working magnetic flux density Bm and the curie temperature Tc decrease monotonously with the increase of the content of the doping nonferromagnetic elements of Mn, Cr and Mo. The variation of the magnetic flux density with the temperature△B_m /△T decreases with the increase of the doping content. It is also observed that the Bm and the Tc of Fe64Ni36 alloy are not influenced by the Co element doping. In this thesis , the best doping elements and content are Mn2wt%、Mn3wt% and Cr3wt%.Several kinds of magnetic temperature compensation alloys with good magnetic temperature performances were annealed, and the effect of annealing temperature and annealing time on the magnetic temperature properties of the alloys were studied. The results show that high annealing temperature can improve the Bm and△B_m /△T. The annealing time has little influence on the magnetic temperature performances. The Curie temperatures of alloys are not dependent on the vacuum annealing. The best annealing process parameter is 500℃for 2 hours in http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php this thesis.The influences of the temperature on the magnetic flux density of a point P in the air-gap of the SmCo magnetic circuit including the magnetic temperature compensation alloys were simulated with the ANSYS finite element software. Experimentally, the magnetic temperature compensation properties of the alloys were verified in the SmCo magnetic circuit. The experimental results are agreement with the simulation results qualitatively. The results shows that with the application of magnetic temperature compensation alloy, the change rate of magnetic flux density of the point P varied from -0.029 mT/℃to 0.004 mT/℃in the temperature range of 20℃to 160℃. This indicates that the magnetic temperature compensation alloy has an excellent compensation effect. The results also show that the compensation effect of magnetic temperature alloy depends intimately on the sectional area of the alloy. Small sectional area results in inadequate compensation, and large sectional area results in excessive compensation.

Research of Magnetic Force Transmission Mechanism of Reciprocation in Line

　　Research of Magnetic Force Transmission Mechanism of Reciprocation in Line
　　The reciprocating motion in line is a kind of movement form adopted extensively in the industry, when is using in such trades as chemical industry, biological product, pharmacy, food processing and air conditioner refrigeration, etc., which requires good seal, no leakage or the friction loss should be little between the part of the reciprocating motion and machine shell. But in these trades, these problems can’t get very good settlement. With the development of the permanent magnetism material and progress of magnetic force drive technology, the use of magnetic force transmission mechanism becomes more and more widely. This subject for research aims at calculating the axial force Ball Neodymium Magnets of the magnetic force transmission mechanism of reciprocation in line, molding system dynamic model, experiment and study, etc..This paper studies the magnetic transmission mechanism from the perspective of dynamics has calculated the axial transmission capacity in detail, has established a reasonable system dynamic model of the magnetic transmission mechanism, and has designed the program of the dynamic experiments.This article consists of six parts show as followed:I .IntroductionThis part has introduced the magnet, magnetic materials, development state of magnetic force drive technology, and classification of magnetic force driver. And on this basis, has explained the magnetic drive mechanism in detail. II.
　　Principle and structure of the magnetic force transmission mechanism of reciprocation in lineFirst of all, this part has told the basic physical quantity of the magnetic field; Secondly, has introduced the vocabulary of terms in the magnetic force drive technology secondly, has introduced the principle and structure of the magnetic force transmission mechanism of reciprocation in line finally. These knowledges provide theoretical support to further study on the magnetic drive mechanism.IQ. The axial force of the magnetic force driver has been calculatedAt first, this part has studied the equivalent magnetic charge theory and the mathematics model of magnetic force which was based on it, has detailed calculated the magnetic force from different surface of the inner and outer magnetic ring by using Matlab. It has got complete performance curve between the magnetic force and the relative http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php displacement between the inner and outer magnetic ring through calculation, has fitted the performance curve into linear in definite range, which has simplified the magnetic force calculation and its application.IV .The dynamic modeling and analysis of the reciprocating motion of magnetic force drive in lineThis part has established dynamic model of the magnetic driver mechanism according to dynamics theory, made a detailed study of the parameters in the model and established mathematics model to each parameter.
　　The paper also has calculated and emulated the model by the software of Matlab.V. Experiment research and analysis of the reciprocating motion magnetic force drive in lineAimed at a different valve angle and different frequency, the writer has done extensive experiments on the reciprocating motion magnetic force drive in line, and measured the variable law of magnetic force and relative displacement. Trough experimental data, it tests the theory about magnetic force only with the relative displacement and has nothing with the valve angle and the frequency. http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php Compared with the theoretic value, it tests the correctness of the theoretic axial force. At last, the writer calculated the efficiency of the magnetic drive mechanism by the method of the linear curve fitting.VI. Conclusion and research foregroundThe conclusion of this article is given, and the research direction of further magnetic force transmission mechanism of reciprocating in line has been proposed imagining, then combine the practice, the research prospect and the reciprocating mechanism of magnetic force drive in line have been probed into.

Research on Non-adhesive Brake Technology for Railcar

　　Research on Non-adhesive Brake Technology for Railcar
　　The traditional train brake technologies suffer from the train adhesion condition limit, when high speed, factor of adhesion between the wheeltrack drops, moreover the line situation and the weather situation influence the adhesion coefficient rather great, it is difficult to guarantee the highspeed train stopping in the stipulation stopping distance purely by adhesion brake, therefore it needs to develope the non-adhesive brake technology to improve the brake technology for Block neodymium magnet high-speed train.The track brake method is first studied in the thesis. Basic concepts of electromagnetism track brake technology are introduced.Caculation method for designing the electromagnetism is also proposed.Permanent magnet brake technology is introduced in the last part of the chapter.Eddy current braking technology is studied.It is recommended that the linear eddy current brake device is most suitable for designing the bogie of CW-200 when considering all kinds of its technology index http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php and appliction condition. The design scheme of eddy current brake device is also presented.Two brake devices for CW-200 are designed.The power supply for brake system is also designed to keep the brake system work in gear all the time.Conclusions and future work are given in the final.

Sensorless Vector Control of AC Motors Based on dSPACE

　　Sensorless Vector Control of AC Motors Based on dSPACE
　　Sencerless vector control (SVC), as one of the AC motor control technologies, combines vector control and general inverters. With the advantages of wide control range, high accuracy, fast response, controllable torque, low cost, high reliability and unrestricted of environment, the reaserch of sencerless vector control (SVC) methods have presently became the hotspot of the drive control aerea. While the control perfomence is required to be higher, the control algorithm becomes more complicated, which make the traditional developing methods, like DSP control methods, need a long developing cycle. The dSPACE is a software and hardware platform for the real-time Ball Neodymium Magnets control system based on the MATLAB/SIMULINK. It has the excellent real-time, extensible performance and the high reliability. So, as a control platform, dSPACE can completely satisfy the requirements of real-time system and generate algorithm codes automatically at the same time.Firstly in this paper, the motor control real-time model was established in MATLAB/SIMULINK using the rapid control prototype (RCP) method based on the dSPACE. Then the realtime experiments were carried on the motors, according to the experiments results, the limitation of the speed controller was analyzed and an improved one was designed. The improved speed controller can effectively improve the performance of the vector control system.Afterwards, two categories of SVC methods which are PI controller algorithm and MRAS algorithm were studied and improved. Both of the methods are based on fundamental excitation.
　　For PI controller method, an PI controller with variable arguments was introduced to substitute the original liner PI controller in order to enhance the estimate performance. And for MRAS model, an improved voltage model was applied, which can avoid the disadvantages that pure integrator has caused, and then an estimate method which can simultaneously http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php estimate the speed and the motor parameters was studied to solve the motor parameter changing problems in the actural operation. All the methods studied above were proved to be viable.Additionally, this paper studies an effective method to estimates speed and position to satisfy the needs of full-speed implement for surface mounted permanent magnet synchronous motors (SPMSM). This method is based on a speed-adaptive observer that is enhanced with a high frequency signal injection technique which is fit for SMPSM drive to operate at low speeds and standstill. This enhanced speed-adaptive observer combined the fast dynamic response of adaptive model with steady-state accuracy of HF (High Frequency) signal injection method can start up under close loop condition. When it works at full speeds it obtains a smooth transition between the two regions.In the last part of this paper, the software and hardware configuration of dSPACE platform were introduced in details. By application examples, the use methods of RTI and ControlDesk are enumerated as well.

Research on the Hybrid Excitation Synchronous Brushless Generator and Its Voltage Regulation System

　　Research on the Hybrid Excitation Synchronous Brushless Generator and Its Voltage Regulation System
　　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 a new type of machine for aeronautic generator system.The basic configuration, magnetic characteristic and output Block neodymium magnet characteristic of hybrid excitation synchronous brushless generator (HESBG) are studied in this paper. Digital automatic voltage regulator (AVR) technique of HESBG are also studied in this paper. Basic configuration and operating principle of HESBG are firstly introduced. According to the radial/axial distribution of magnetic field, equivalent magnetic circuit model is developed. The magnetic field distribution and static-state characteristic of HESBG are analyzed by 3D finite element method http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php (3D-FEM), and the principle of optimizing design is also presented. The configuration of magnet and axial distribution are improved. The principle of optimizing design is proved by magnetic analyses. Then the Characteristic and regulating range of magnetic field in air gap is studied. Transient-state characteristic including no-load characteristic, external characteristic, regulation characteristic and Armature reaction are studied by 3D-FEM when optimizing structure is acquired. Finally the digital automatic voltage regulator (AVR) and software has been designed. The basic principle of the system is proved by experiment.

Research on the Voltage Regulation System of Hybrid Excitation Doubly Salient Motor

　　Research on the Voltage Regulation System of Hybrid Excitation Doubly Salient Motor
　　A novel hybrid excitation doubly salient machine (HEDSM) had been developed recently. It offers the advantages of simple structure, high performance and robust realization of field adjustment. The features make this new machine a potential candidate in the future industrial application.Firstly, this paper analyzed the configuration and the basic principle of this machine. Block Ceramic Magnets With the finite element analysis software Ansoft Maxwell 3D, the simulation research has been conducted. The magnetic field and its static characteristics of the HEDSM have been obtained. The performances of the HEDSM, operating in generating modes, have been deduced.Secondly, an analog voltage regulator has been designed, based on adjustable bi-direction field current. The model of the HEDSM has been obtained through the step response experiment. The simulation configuration has http://www.chinamagnets.biz/Ceramic/Block-Ceramic-Magnets.php been built in Matlab. The static and dynamic experiments have been done on HEDSM generator platform. The experimental results of three generation strategies, including SRG, DSG1, DSG2, have been analyzed.Finally, a digital voltage regulator has been designed based on the TI TMS320VC33 floating Digital Signal Processor (DSP). Digital control system simulation has been conducted in Matlab. Through the experiments on digital voltage regulator, the influence of PI parameters to dynamic performance has been analyzed.

Research on Switched Reluctance Motor Drive System for the Electrical Bicycle

　　Research on Switched Reluctance Motor Drive System for the Electrical Bicycle
　　Recently, with the modern city’s rapid development, the city scale is enlarging continuously. The city traffic, the environment pollution and the energy sources problem also are concerned increasingly. The developed countries not only research and develop the new electric vehicle, but also develop electric motor and bicycle actively. Without doubt, it is one of the most attracted developing directions in China to the research and development of electric bicycle and motor rubber magnetic sheet according to the average per capita income and people living conditions, as well as the economic strength and the technology condition of relevant enterprises.This paper brings forward electric bicycle system which is driven by Switched reluctance motor, aiming to the inherent demerit of the permanent-magnet brushless DC motor(PBLDCM) extensive used in present electric bicycle market and the small passage range problems resulting from the low-energy density of lead-acid accumulator. The SRM drive system specially is suitable to the working need of electric bicycle by reason of many merits such as good starting ability, outstanding performance in a wide speed range, and convenient switch between electric and regenerative braking mode.
　　At first, aiming to the special demand of the external rotor motor, three kinds of different structure SRM are contrasted the performance of starting, over http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php loading and efficiency, and the direction optimizing the tooth pole is educed. Then, the electric bicycle dynamics model based on MATLAB/SUMLINK nonlinearity inductance model is built. It carries out the parameter optimization of the electric and regenerative braking mode, and analyzes detailedly the optimization strategy of the regenerative braking mode. Accordingly, a control strategy fitting to the experiment sample is educed. Last, the hardware and software of the electric bicycle drive system on the basis of DSC chip dspPIC30F3011 are developed, and achieve the electric bicycle’s many functions such as cruising speed, broken-electricity brake and the protection for over voltage, under voltage, over temperature of power module, and carry out the experiment to verifying the simulated parameter optimization effect. And the sample system achieves the expected object.

氯过氧化物酶的固定化及其应用研究

　　氯过氧化物酶的固定化及其应用研究
　　Chloroperoxidase(CPO) is recognized as the most versatile enzyme in the group of peroxidases because of its unique active site structure,it is noticeable particularly that it has the function of chiral recognition for substrates,so it has very captivating development and application in asymmetric organic synthesis,biotransformation,chiral pharmaceuticals,detoxication of environmental pollutants and etc.However,due to its inactivation in extreme conditions,including high-temperature,strong acids and base,the industrial application of native CPO has been severely limited.In this paper,immobilized CPO improved thermal stability and catalytic activity of enzyme, and increased the adaptive ability to the synthesis environment.Meanwhile,it will provide a basis for immobilized enzyme ha the practical application.Immobilization technology of enzyme is an effective measure to achieve repeatly using of enzyme and improve stability.In the article,two new materials Cast Alnico Magnet were selected for the carriers of immobilized CPO,including chitosan membranes/beads and magnetic microspheres.Chitosan is a very ideal immobilized carrier because of its rich resource,good biocompatibility and susceptibility to chemical modification.
　　Meanwhile,magnetic microspheres have super paramagnetism,so the immobilized enzyme by magnetic microspheres is easer to be separate and recycle than other carriers, and it can reach a higher-load.The results of optimized conditions of immobilization of CPO, differences between native CPO and immobilized CPO had be investigated by MCD assay,and application of immobilized CPO in catalytic polymerization of pyrogaUol had be showed as follows:1.CPO was covalently immobilized on chitosan membranes(beads) under mild condition with glutararldehyde as a crosslinking agent.The results indicated that the optimum concentration of glutaraldehyde and pH were determined to be 0.8%and 3.5,respectively.Compared with the native CPO,immobilized CPO has excellent thermal stability,and the stability of immobilized CPO against urea and hydrogen peroxide exposure was improved.The immobilized CPO can retain about 40%of its activity after 1h incubation at 50℃,whereas native CPO could maintain only about 0.02%of its activity under the same conditions.Furthermore,immobilized http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php CPO had unchanged residual activity (about 100%),but the 32%loss of activity for native CPO in the presence of 1.5 M urea.When incubated with 300μM H2O2,the immobilized CPO retained 58%after 20 h whereas the residual activity of native CPO only retained 42%.2.Thiocyanate groups containing magnetic micropheres were used in covalent immobilization of the enzyme "CPO".The results showed the optimal conditions of immobilization:the optimal pH was 5.5,and the optimal reaction time was 10 min.The maximum amount of immobilization CPO on the magnetic micropheres was 25.59 mg/g support.Compared with the native CPO,the affinity of immobilized CPO decreased toward substrate and its stability was considerably improved. Immobilized CPO is incubated in http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php the presence of 300μM H2O2 in different times,the immobilized CPO still remain about 50%of its activity after 96 h,whereas native CPO only remained around 9%. This result suggested that the covalently immobilized CPO was considerably stable on the magnetic micropheres surface and the immobilized CPO retained more than 85%of its initial activity after 16 cycles of usage.3.So the catalyzed polymerization of pyrogallol using immobilized CPO was investigated.The result indicates that the immobilized enzyme was used for transforming pyrogallol into purpurogallin in aqueous phase.

Study of the Rare Earth Giant Magnetostrictive Current Transformer

　　Study of the Rare Earth Giant Magnetostrictive Current Transformer
　　Giant Magnetostrictive Material (GMM) is another new function material together with rare earth permanent magnetic material、rare earth element luminescent material and high temperature supercoducting material. In the action of definite magnetic field GMM has awfully lardge length or bulk transformation compared with traditional nickel group and iron group magnetostrictive material, it’s magnetostrictive coefficient can reach 2500ppm.In this paper, the author put forward a new train of thoughts to design electronic Current Transformers; namely, applied GMM in electronic Current Transformers. The basic idea of this design is: when in the action of magnetic field, the length of the GMM stick will chang, the output light from the fiber-optic sensing probe ( single Block neodymium magnet mode pigtail + Grin-lens ) be reflected by one side of GMM and entered into fiber-optic sensing probe second time, the light force will be modulated, then the output power will change. When deal with the output light through photoelectric conversion and other relative disposal, we can know the electric current loaded in the drive winding from the output voltage and then realized real time supervise the exterior current.In this paper, the author presented two schemes of the current transformer, photoelectricity mode and all-optical mode; designed the related parameter of the inspired magnetic field and bias magnetic field; Analyzed the sensing part, photoelectric conversion part, and give the in-out characteristic http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php curve of the two systems; finally, cometo the conclusion that all-optical mode current transformer has definite practical use.The fiber-optic sensing probe and photoelectric conversion parts also can realize themicro displacement test, this is a new method to test the micro displacement, it has many merits such as has a high precision and good reliability and so on.

Research on Effective Organizational Form of Private Enterprises of China-Industrial Alliance from the Perspective of Shanxi Magnetism Material Alliance

　　Research on Effective Organizational Form of Private Enterprises of China-Industrial Alliance from the Perspective of Shanxi Magnetism Material Alliance
　　Private enterprises have obtained considerable development and already become a major constituent part of national economy and important power to impel social and economic development of China since reform and opening up. However, there are inevitably many difficulties of private enterprises which have grown in the period of reforming in the course of development, such as funds insufficiency, small scale, lower technical level, weaker innovation ability, talent shortage and higher flow rate. There are enormous challenges for the survival and development of private rubber magnetic sheet enterprises which are generally at the inferior position in domestic and international competition due to the congenital difficulties with the change of social and economic environment, especially the rapid development of science and technologies, entering into WTO as well as the integration of international economy. Therefore, how to get rid of the difficult position and how to grow stronger are always the puzzle of private enterprises, and also the focus of government and all walks of life of the society. Private enterprises of Shanxi magnetism material industry as a part of private enterprises of China, which have started since 1986, have also experienced the difficult period which China’s private enterprises went through.
　　There are also congenital difficulties in their developing process, and they are also in inferior position in domestic and international competition. Nevertheless, they have gained great achievements in 7 years after they took the path of common development through building magnetism material alliance, whose member has developed from the initial 18 magnetism material enterprises to 102 members until 2007containing 100 private enterprises, involving different industrial http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php chains such as raw materials, manufacture, processing, trade, and equipments and so on. Moreover, Shanxi magnetism material alliance has already become the largest industrial organization of China to be engaged in agglutination, processing neodymium iron boron and special equipments. The success of Shanxi magnetism material alliance has given the enlightenment about how to get rid of the difficult position of private enterprises of China especially small ones through building industry alliance. This graduation thesis conducts the research precisely for this goal.
　　This paper analyzes the ecological background and build-up types and characteristics of the current international industrial alliance on the basis of "management ecology". It holds that the international industrial alliance has provided the platform to enhance competitive advantages for large enterprises or enterprises with powerful technology, but it has exclusiveness for small and medium-sized enterprises. Then, it comprehensively analyzes the independent development characteristics, familial characteristics, regional characteristics and authority pursue characteristics under the special situation of China from the historical and ecological perspective. Furthermore, comparing with the path of funds and talents introduction, the path of merge and collectivization development, the path of international industrial alliance pattern development as well as the path of Shanxi magnetism material alliance http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php pattern development under the congenital difficult conditions of funds insufficiency and small scale, it believes that Shanxi magnetism material alliance as an organization form among enterprises is suitable and effective for private enterprises of China. Thus, its experience can be drawn for that of China. At last, the paper suggests some countermeasures and suggestions for developing industrial alliance of private enterprises in China on the analysis of the success and existent questions of Shanxi magnetism material alliance.There is certain guiding sense of this paper to the current development of private enterprises of China, which can help China to realize innovative country and give some enlightenment to the regional policy-makers.

Regenerative Control-System of Elevator Research and Integration

　　Regenerative Control-System of Elevator Research and Integration
　　Regenerative system has been proposed and applied on many field due to the shortage of natural resources and the people’s recognition of environment. This technology of the regeneration is advanced and the target of this field. That is, replacing dynamic brake resistance with regenerate model to achieve the purpose of energy-saving.Currently, there is an application regarding regeneration in china. That is, replacing dynamic brake resistance with the regenerate package outside of the drive to achieve the purpose of energy-saving. This application needs the big size and high cost. Cast Alnico Magnet So, it could not be applied popularly.This task is to add OTIS drive which including regenerative model into elevator as elevator-control system. So, this drive needn’t the dynamic brake resistance and has the regenerative feature. This drive will translate the energy from motor to main line during elevator is down dirction at full load, up dirction at empty load and brake condition. Then, the energy is saved. Also, the heat-pollution released from dynamic brak resistance is erased. Especially, the work cost of this drive approaches the one of the traditional drive. The elevator-control system with OTIS regenerative drive has the advantage of low cost, high performance and wide applicative scope.This task is to research and develop and integrate the elevator-control and drive system which matches OTIS regenerative drive’s requirement. The system-model includes OTIS 25A regenerative drive, 2.5T http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php permanent magnetic synchronous gearless machine, control board and load weighing board.Now, the design of regenerative system on elevator has been completed and has been integrated on Gen2 CN-MRL which is the main product of OTIS. This system can run normally on prototype and all test results meet marketing requirement.

Weakening the Cogging Torque of Flux Reversal Machine and the Impact on Electromagnetic Torque

　　Weakening the Cogging Torque of Flux Reversal Machine and the Impact on Electromagnetic Torque
　　Flux reversal machine (FRM) is a special doubly salient permanent magnet machine. By this time, it is not been comprehensive studied, whether on the structure or the performance. The shortages restrict further development of FRM. Cogging torque ripple is one of the problems that have not been solved. There have been some methods of weaking the cogging torque, and can weaken cogging torque well, but the shortcomings made them unpractical to produce. So neodymium prices this thesis studies the methods of weakening cogging torque of FRM and the impacts on electromagnetic torque. Based on the existing research results and considering the characteristics of FRM, a new effective method is proposed to weaken cogging torque of FRM. It uses rotor teeth alternative and subsective structure. This method makes use of the rule of variety of cogging torque with rotor teeth change, and the cogging torque of two parts of FRM have opposite phase, so the total cogging torque is weakened.Finite element method is used to analyse the electromagnetic field. The trend of cogging torque and electromagnetic torque are comparesed. The principle of weakening cogging torque is that the electromagnetic torque should been smooth and not been reduced much. First, this thesis makes analysis of impacts on cogging torque by rotor teeth change and the harmonic components of cogging torque. The rule http://www.999magnet.com/products/142-neodymium-prices of the periodically viriaty of cogging torque by length of rotor teeth arc change is found. A method of weakening cogging torque by rotor teeth alternation and subsection is proposed. The results of electromagnetic field calculation prove that the method is effective. At last, the impacts of this method on electromagnetic torque is considered and analysed. The result indicates that this method is feasible.

Robust Control Design of Servo System with Input Delay

　　Robust Control Design of Servo System with Input Delay
　　Based on the turntable servo system, the mechanism of time delay was studied in this work. Moreover, the synthesis problem of controller in the turntable servo system was investigated with the robust control theory on the basis of the analysis of the effect of the model perturbation to the system.Firstly, the control structure of servo turntable system was analyzed and designed. The mathematic model of permanent magnet synchronous motor was deduced with complete decoupling. The uncertainty and its formation mechanism appeared in the system was analyzed in detail. Two main uncertainties, the input time delay and high frequency no modeling dynamic, were described with the magnetic materials model of unstructured multiplicative uncertainty. The uncertainty of the controlled object modeling was analyzed. As for the time delay and high frequency no modeling considered in design, the uncertainty modeling of non structure was found.Secondly, the concept of the standard H∞problem was introduced based on the relationship between performance index and robust stability in H∞control theory to solve the problem of robust control in the uncertain system. The structured singular value theory was used to reduce the conservation of the standard H∞design in the multi-uncertain system. Meanwhile, the select and adjustment principle of weighted function in design was given out. The sufficient and indispensable condition of the robust stability and robust performance was investigated with the theory ofμ-analysis and synthesis.
　　This condition was described with an inequation of matrix structured singular value. At the same time, the basic framework ofμ-analysis and synthesis was http://www.999magnet.com set up. The principle and approach ofμ-analysis and synthesis controller computing was given.Finally, the basic problems of the system design and the performance requirement were described, and the robust controller of the turntable servo system was designed based on theμ-analysis and synthesis framework. The weight function was selected according to its select principle after getting the parameter in the model. Consequently, the controller was designed by use ofμ-analysis and synthesis in the toolbox of Matlab. The results of theory analysis and simulation validation indicate that the robust controller makes turntable system have a good robust performance.

Design of Control System Based on Disturbance Observer for Turntable

　　Design of Control System Based on Disturbance Observer for Turntable
　　Some designs and researches on the turntable servo control system, including the control plan of the turntable system are presented in this thesis, mathematical model and the design of the control system. In order to solve the nonlinear disturbance problem existed in object, a PID controller based on disturbance observer is put forward, and some optimized designs with theory of fuzzy control are provided in details..Firstly, the paper derivate the mathematical model Neodymium Magnets of the vector control-PMSM on the basis of identified turntable servo control system., make analysis of the friction and torque fluctuations, and establish the friction model which can be used for simulation by simulink, so we can make research on systems with friction model.Secondly, In order to improve the dynamic performance and adaptability of the system, the paper makes some online real-time adjustments on the PID parameters by using the fuzzy controller. In that case, it can not only be flexible and adaptable as fuzzy control, but also high precision as PID control. Thirdly, the paper introduces the basic principles and designs of the disturbance observer, and studies the influences that the parameters of the low-pass filter have on the system’s anti-jamming capability and stability. In this paper, the PID http://www.999magnet.com/products/110-sintered-neodymium-magnets control based on disturbance observer can divide the design of the controller into two separate stages. One is for performance design (design of the PID controller), the other is for disturbance suppression (the design of the disturbance observer).At last, the control theories and results can be used in the design of the turntable system, which indicate that the fuzzy-PID controller based on DOB has the advantages of high control accuracy and adaptability.

The Research of Sliding Mode Control in Servo Drive System

　　The Research of Sliding Mode Control in Servo Drive System
　　With the development of modern industrialization, high performance AC servo drive system is widely used in various areas. AC servo drive system is a high order, nonlinear, coupling system, in order to realize better characteristic of the system, the higher performance control strategy is expected. In the dissertation, some new efforts are made to overcome the parameter variations of AC servo drive system. The purpose of the study is to improve the robustness of AC servo drive system and to meet the increasing demand of high performance on AC servo drive system.Sliding Neodymium Magnets Mode Control (SMC) has been known for its robustness in accounting for modeling imprecision and bounded disturbances. However, in practice, the high frequency chattering phenomenon becomes a severe problem when it comes to SMC. Fuzzy Logic Control (FLC) has excelled in dealing with system which is complex, non-linear, or time-varying as it convert the linguistic control strategy of human experience or experts’ knowledge into an automatic control strategy. At the same time, the major drawback of FLC is the lack of design techniques.
　　Merging of the FLC with SMC can form a Fuzzy Sliding Mode Controller (FSMC). In this hybrid control system, the advantage of the SMC lies in its ability to account for modeling imprecision and external disturbances while the FLC can reduced chattering and provides better damping.The dissertation studies an AC servo drive system with the Permanent Magnet Synchronous Motor (PMSM) as the executive component, focus on the design and development of fuzzy sliding mode vector control system. First, by analyzing the mathematical models of the PMSM and the vector control strategy, the disadvantages of the conventional methods is found. Then, an sliding http://www.999magnet.com/products/110-sintered-neodymium-magnets mode control is proposed which is a more ideal methods compared with the conventional. At last, an fuzzy sliding mode control is proposed. The fuzzy inference mechanism is utilized to estimate the bound of uncertainty, so it not only can fully exert the characteristics of SMC which are insensitive to parameters change and disturbance, but also has the ability of fuzzy self-adjusting, thereby the aim of decreasing chattering can be achieved. To prove practicability of intelligent ccontrol in AC servo drive system ,the dissertation uses the software of MATLB/Simulink to make a simulation. The simulation results show that the theory proposed consists with the results of simulation.The system meets the demand of required performance and paves the way for future research.

Structure and Magnetic Properties of Nd-Fe-Co-Mo Alloys

　　Structure and Magnetic Properties of Nd-Fe-Co-Mo Alloys
　　Nd3Fe29-x-0.9CoxMo0.9 (x= 4,8,12,14,16) alloy ingot and ribbons were prepared by melting quenching and a single roller melt-spinning of 20m /s method respectively,their structure and magnetic properties were examined by XRD,SEM and VSM measurement instruments。VSM results indicates that the saturation magnetizationσs and the residual magnetizationσr have not any obvious changes for Nd3Fe29-x-0.9CoxMo0.9 (x = 4,8,12,14,16) ingot samples with the Co content increasing , and the coercivity Hc are smaller。After annealing, the neodymium prices saturation magnetizations of all the ingot samples decreased respectively, and the coercivity were increased。the biggest coercivity was 5205Oe and the saturation magnetization is 122 emu/g (1T) when x=8 for the Nd3Fe29-x-0.9CoxMo0.9(x=4,8,12,14,16) ribbon samples。When annealing at 723K , the saturation magnetizationσs and the residual magnetizationσr were relatively decreased,and the coercivity was corresponding increased, the maximum coercivity is 5591Oe when x = 8, and the saturation Magnetizationσs is 65.15 emu/g。To reveal the relationship between coercivity and microstructure, Nd3Fe29-x-0.9CoxMo0.9(x=8) with a larger coercivity and Nd3Fe29-x-0.9CoxMo0.9 (x =16) with a lower coercivity were chosen to investigated by means of SEM and XRD。The results show that the main phase of the sample is 3:29 phase and the mixed phase is a small number ofα-Fe phase when x = 8;the main phase of sample is 2:17 phase when x=16。The internal grain size of x = 8 samples are more http://www.999magnet.com/products/142-neodymium-prices uniform,and for x = 16 samples , the internal grain size is very uneven,and there are some black dots in some places。To sum up:1、For the first time the samples with the main phase of 3:29 phase was prepared by melting quenching。2、It is found that the larger coercivity can be achieved through the appropriate amount of substitution of Fe with Co。3、The coercivity mechanism for the studied sample was the domain wall pinning model。4、Further work is in progress。

The Design and Realization on AC Servo Controlling System

　　The Design and Realization on AC Servo Controlling System
　　Servo technology have rapidly changed from DC Servo system to AC servo system,AC Drive have become main mode in drive field,research high performance AC servo system have important realistic meaning.The mathematical models of AC PMSM is founded at first,analyzing rotor magnetic field-oriented vector control theory and method, then the Cast Alnico Magnet simulation research based on MATLAB/SIMULINK is completed, validates the feasibility of control theory and provides the theory basis for the realization and debugging of real system.Aiming at the digital controller using TMS320LF2407A as control chip, particularly introduce how to realize SVPWM signal. This method have advantages ,for example ,a clear physics idea﹑simple arithmetic﹑high efficiency of DC voltage﹑easily realized numeric.At last, the paper introuduces the system design and realize according to the request of hardware and software.In terms of the hardware, analyzing and designing the system main circuit﹑communication circuit﹑signal manage circuit;In terms of the software, real time control program which adopts the modularization idea is compiled based on C http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php and assemble language.At the base of analysis and design,the paper develops a AC servo controlling hardware platform, realizes the corresponding interface and signal manage sircuit,and performs system debugging and adjust parameter,the experiment results realizes PMSM controllable running.

数字化火炮反后坐装置控制方案研究

　　数字化火炮反后坐装置控制方案研究
　　The battlefield of the future will be digitized, which are charactered withautonomous, informationized, intelligentalized. the traditional artillery technique couldn’tmeet the requirement of the field the artillery technique is in process of beingdigitized. This paper is based on the traditional value type recoil counterrecoil mechanism.By improving the traditional value type recoil counterrecoil mechanism. realized thecontrol of counterrecoil system to be digitized.The main research and conclusion of this paper can be summarized as following: Byanalysed the structure and the Alnico Magnets principle of the traditional value type recoil counterrecoilmechanism, put forward the improved schemes, and included the ameliorated scheme ofthe frame and the control frame. Researched on the positive problem of the improved valuetype recoil counterrecoil mechanism. included studying out the recoil brake diagram. Madecertain the structures and all pamameters of recoil mechanism, such as baffling curveh-t. then built the mathimatics models of recoil mechanism with MATLAB/Simulink.According to the mechanics structure, calculated the parameters of electromotor for nextsimulation step, such as power, torque, rotate speed and so on, and established the type ofthe electromotor. Using Mat lab’s Simpowersystem and Simulink module, some simulationmodules, such as Permanent Magnet Synchronous Machine http://www.999magnet.com/products/108-alnico-magnets and it’s drive system, pushingsystem’s control module was designed. Additional, Based on the control system’s scheme,established the design of the hardware circuit and the software of control. Finally,simulated the procedure By uniting the mathematic model of recoil mechanism and PMSMcontrol model. And validated the feasibility of the scheme.

Servo Control System Design and Research of Embedded NC Repertoire

　　Servo Control System Design and Research of Embedded NC Repertoire
　　In recent years, with the rapid development of the modern Industrial Automatization, it puts forward a higher request to the servo system as the main driver of the industrial equipment, including improving the control accuracy and the structure of hardware. A kind of servo system based on embedded NC repertoire module is designed and discussed in this paper.In this paper, aimed at the application of the embedded NC module, the basic circuit was designed. NC repertoire installation was not set because of embedded NC system. The main circuit consists of the switching Neodymium Magnets power supply, the main control circuit, and the power circuit. The switching power supply power to the main control circuit as well as the power circuit. The main control circuit sends 6 PWM signals. After the isolation and enlargement by the power circuit, these signals could drive the Permanent Magnet Synchronous Motor (PMSM for short). The control procedure in the servo system contains the logical function module, the NC repertoire module and the servo-control module, all these are embedded in the same periods which is 60us. Target velocity and target location are given by the logical function module, and then as the input of the NC repertoire module. After receiving the NC repertoire computed by NC module, and further computation processing in the servo-control module, it will supply the driver signals of the PMSM through the real-time feedback information from the current loop, the speed loop and the position loop, 3 closed loops in all. The vector control algorithm is applied to the control of PMSM.Also in the paper, an approach to the Acceleration and Deceleration based on linear acceleration and http://www.999magnet.com/products/110-sintered-neodymium-magnets deceleration is explained particularly. The content includes real-time velocity variation, motor position control, velocity filtering and smoothing, etc. The real-time velocity modulation is mainly about how to choose certain acceleration curve according to exterior instruction. The procedure calculates deceleration spot according to the position distance, which is the method for the motor position control. Since linear acceleration and deceleration make motor abruptly stop and start that create the sharp corners of the velocity profile,S-Curve motion profile refers to solving the problems. Motor motion

Development of Control System for Fully-Automatic Industrial Lockstitch Sewing Machine

　　Development of Control System for Fully-Automatic Industrial Lockstitch Sewing Machine
　　Along with the rapidly development of clothing trade in China, the demand quantity of sewing equipments to the correlation is more and more, especially, the industrial lockstitch sewing machine also obtained the fast development as the main equipment in the clothing processing industry, the former common production has not already been able to satisfy the market demand, at present, the fully-automatic, straight driving, high speed industrial lockstitch sewing neodymium prices machine receives the market favour, on behalf of industrial lockstitch sewing machine development direction.This article obtains from the fully-automatic, straight driving, high speed industrial lockstitch sewing machine’s principle and the function, has determined overall plan of control system based on the permanent magnetism AC servo technology, has selected permanent magnet synchronous motor and absolute magnetoelectricity encoder, uses 32 bit single-chip, Mitsubishi Corporation’s third generation intelligent power modules and TI Corporation’s monolithic switching power chip as the core component, has designed the main hardware in the fully-automatic, straight driving, high speed industrial lockstitch sewing machine, and has carried on a great lot of debugging and experiment, greatly strengthened the entire control system reliability through revising power module actuation electric circuit plan, has solved the problem that the electromagnet reliably attracts gathers in the width voltage scope, through using back-fly switching power http://www.999magnet.com/products/142-neodymium-prices supply for the electromagnet power supply. And has designed the user function program in the base of whole control program frame, then has carried on the entire machine debugging, and revised and perfected the user function program. System has realized automatically stopping the needle, automatically back sewing, automatically cutting line, automatically dialing line. And system can freely complete the free sewing, the certain length sewing, the repeated sewing and the trademark sewing.Finally, this article has carried on the entire machine performance test, indicated the main targets of control system already achieved or has surpassed the domestic and foreign homogeneous types machine.

电力电子控制的电动机操动机构动态特性的仿真研究

　　电力电子控制的电动机操动机构动态特性的仿真研究
　　As one of the important parts of a circuit breaker, the operating mechanism is required to guarantee long-term operational reliability of the circuit breaker as well as to be beneficial to arc extinction. Conventional operating mechanisms presents complexity in structure design and little flexibility in control, hence they normally cannot fulfill the requirement for a specific opening or closing operation in power systems and often pose high failure rates. In order to improve reliability, stability and security of power systems, investigations are continued to develop new operating mechanisms for circuit breakers.Presently, two kinds of operating mechanisms are being Cast Alnico Magnet developed, one is based on permanent magnetic actuator together with electronic control, and the other is power electronics controlled motor drive mechanism. The motor drive mechanisms also can be divided into two types, i.e. rotary motor and direct-line motor drive types. Direct-line motor driven circuit breaker has been developed with relatively mature technology available; however, rotary motor driven circuit breaker is a new research area to be explored.With the development of power electronics and modern control theory, the advantages of rotary motor control are more and more evident. Therefore, rotary motor driven circuit breaker falls into researchers’ vision with potential application perspective. A motor with flexible control capability can realize any kinds of closing and opening operations of a http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php circuit breaker, providing arbitrary velocity-force characteristics under different working conditions. The motor driven circuit breaker has unique advantages in mechanical structure design and controlled operation time, and will be the developing direction of phase-controlled circuit breaker.The research of this thesis concentrates on the power electronics controlled motor driven mechanism. A feasible control strategy is proposed to realize smooth closing and opening operations of circuit breaker, and subsequently the possibility of using intelligent control is analyzed. Firstly, the advances in circuit breakers’ operating

AC Drive System Simulation Technology Research with PSpice and Matlab

　　AC Drive System Simulation Technology Research with PSpice and Matlab
　　Computer simulation technology has been playing more and more important role in the research and analysis of AC drive system. The computer simulation can provide convenient, cheap, flexible and reliable model for us, through which the working characteristics of each part of AC drive system can be analyzed. And then, the optimal parameters are chosen and better system scheme is confirmed.To research the control performances of AC drive system deeply, it is necessary to research and analyze the computer simulation technology further. To fulfill the aim of improving and enhancing the control performances of AC drive system through simulating and analyzing each rubber magnetic sheet part of AC drive system. In this paper, the AC drive system is analyzed in three aspects: modeling, simulation technology and experiment research. Especially, the applications of PSpice and Matlab, the two most powerful simulation software, in AC drive system simulation are researched in this paper.Generally, in the first stage of design, the Simulink in Matlab is usually adopted to get the standard reference value using the ideal model. But in the next stage, PSpice is mostly used to perform the real characteristics simulation for the circuit. So the influence of system non-linear character, delay and response characteristics of the real components on the system is evaluated. Therefor, the powerful circuit simulation function of PSpice and the mighty calculation function of Matlab must be used synthetically.
　　The component models, subsystems and subcircuits of PSpice are used to perform DC analysis, AC analysis, Transient analysis, Fourier analysis, temperature analysis, parametric analysis and Monte Carlo analysis etc. Then the system data analysis, output curve fitting, data integration, data division, statistical analysis and planar, three-dimensional plot are performed using Matlab.To begin with, the actualities, development trends of AC drive system and the model of PMSM are studied. The mathematics model and main control strategies of AC drive system are http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php analyzed. And then the applications of PSpice and Matlab in AC drive system simulation are researched respectively and also their advantages and disadvantages in AC drive system simulation. The co-simulation technology of PSpice and Matlab is presented with emphasis in the fifth part. That is to get the simulation data of PSpice using Matlab. So PSpice and Matlabcan be used together in AC drive system simulation. In the last part of the paper, the experiment is carried out. The PMSM step motion control system is presented 更多还原