Robust Performance Control for AC Servo System

　　Robust Performance Control for AC Servo System
　　Almost everyone of physical systems due to various reason of the inner part and exterior, which is still influenced by the plant parameter variations and external disturbances. Because these uncertainties existence, in fact, optimum control which obtained according to the ideal model not only can’t guarantee optimum, but also cause the control quality to descend seriously. In this paper, Aim at the influence of parameter variations and external disturbances to the high speed and high accuracy systems, Block Ceramic Magnets
http://www.chinamagnets.biz/Ceramic/Block-Ceramic-Magnets.php robust control theoretical method is adopted, two kinds of control strategies were put forward, in order to resolve the problem above-mentioned.First is the study of robust controller according to the foundation of control theories, when the parameter perturbation occurred in the plant, state feedback controller which Cause the system quadratic stabilization is need to be designed. In this paper, the design problem of quadratic stable controller is changed into H_∞ standard design problem based on state feedback. Then on the base of H_∞ standard design, robust progressive stabilization condition of the system is given with the LMI form, the feedback controller is obtained by feasible solution of LMI. When the system is influenced by the parameter variations and external disturbances, the controller make system stable.
　　The feasible solution can be obtained through the LMI tool box.An H_∞ adaptive controller with a pre-specified H_∞ property is proposed for the tracking control of permanent magnet http://www.chinamagnets.biz/Ceramic/Block-Ceramic-Magnets.php synchronous motors, introduction of a feed-forward compensation and a parameter tuner to reduce the influence of uncertainties and external disturbances. In face of uncertainties and external disturbances, once H_∞ property is satisfied, the capability to track input is achieved, the robust performance control problem is formulated as a nonlinear H_∞ problem. In order to solve a problem of nonlinear H_∞, a parameter tuner and a H_∞ feed-backward controller and compensation control is integrated, the synthesis is achieved bychoosing a quadratic storage function. The result to track step command are provided demonstrate the effectiveness of the proposed adaptive Hm controller.In this paper, Riccati inequality is changed into LMI according to schur complement theorem, the solution of controller is obtained through LMI, and the process to solve is simplified. Simulation results are given to demonstrate the effectiveness of the proposed control scheme, which have not only good robustness but also Quick-response.

Design of Conversion System for Small Distributed Power

　　Design of Conversion System for Small Distributed Power
　　Micro-turbine distributed power supply system with high flexibility and reliability, can not only cover the large power line’s shortage of inconvenience to remote areas, but also has no shortage of expanding local area networks for large incidents error, therefore, researching distributed power supply has great significance. Since the frequency and voltage of electricity generated by micro-turbine can not supply the users directly.Block neodymium magnet
http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php  It should be converted the electricity to meet the users by AC-DC-AC conversion system. Conversion system is the important device connecting the micro-turbine and users, this paper introduced a conversion system of AC-DC-AC based on the micro-turbine, and the digital signal processor controller was used in this system.In the conventional conversion system, the diodes or thyristors were used generally and the current harmonic is high. The impact of harmonic on high-speed turbine is prominent for it’s small size, power density and heat release difficulties, To reduce the impact of harmonics http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php on the micro-turbine, this paper adopted PWM rectifier. Simulation for the diodes and PWM rectifier based on the Matlab/Simulink has verified the lower current harmonic of PWM rectifier than diodes rectifier. PWM rectifier can decrease the effect of harmonic on the micro-turbine.PWM inverter was used in this paper to meet the demands. The modulate strategy of inverter is SVPWM. This paper gave details of the software design and applications of SVPWM control algorithms. Experiment was carried on the PWM inverter which was designed. And the result confirmed the practicability of the inverter base on the SVPWM control strategy. The job of this paper worked for deep research and established the foundation.

The Research of Intelligentized Synchronous Motor Excitation Controller

　　The Research of Intelligentized Synchronous Motor Excitation Controller
　　Under driving variability load conditions, synchronous motor excitated magnet by direct current has better efficiency than permanent magnet synchronous machine’s. Synchronous motor excitated magnet by direct current can make output mechanism specialities matched load specialities by means of adjusting exciting current to change magnetic field and power Ball Neodymium Magnets
http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php factor. Synchronous motor excitated magnet by direct current can work on the state of absent excitation current, normal excitation current and excessive excitation current. The state of synchronous motor’s power factor value equaling to 1 approximately and the reactive power being the least is the normal excitation state. So it is important that we design a set of stable and reliable excitation device of synchronous motor excitated magnet by direct current.Devising excitation device of synchronous motor with the characteristic of stable, reliable and having better effect of saving electrical energy is just my major task. Synchronous motor can sustain power factor closing to one and work at the state of excessive excitation current even if synchronous motor’s load is changed abruptly. Here, the effect of synchronous motor is the best. At first, finish system’s design of hardware circuit;
　　Then amend parameters and check design error by simulation soft EWB. Make PCB board with software protel DXP and weld electron component;At last, debug software programme and realize system’s function.A set of synchronous motor excitation device with the imbedded microcomputer PIC16F877 as the intelligentized control unit is presented in this paper. Single chip finish detection of input signal and http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php disposal of control arithmetic. Then it export pulse width modulation signal through RA2 to control IGBT’s on-off. Thus excitation current can be adjusted and closed loop control of power factor can be completed. Furthermore, this device has the functions of casting excitation current automatically, out-of-step protection, protection of absent excitation and excessive excitation and giving the alarm.Because this system has some characteristics of nonlinearity, time-variety and complexity, Common PID controller with three invariable parameters does not reach control command. So propose a new fuzzy controller based on neural network and make it applied this system. The control model is structured by SIMULINK module, and the simulation results show fuzzy neural network control is preferable to PID control and fuzzy control in respect of fast tracking performance and anti-jamming performance.

Simulation for Motor/Battery Working with High Efficiency of HEV Regenerative Braking System

　　Simulation for Motor/Battery Working with High Efficiency of HEV Regenerative Braking System
　　Regenerative braking (energy recovery braking) is an important working mode for HEV, which has a direct impact on fuel economy, emission and running security. During deceleration or braking, based on assuring vehicle braking performance, regenerative braking system can turn its electric motor into an electric generator to invert vehicle kinetic energy or potential energy into electrical energy stored into battery for recovering energy, and also supplies the whole braking forces or partial braking forces at the same time. Regenerative braking not only realizes the deceleration and braking, but also reduces fuel consumption and pollutant emission.For HEV NiMH battery, the conventional charging means aren’t fit for the characteristic of regenerative braking. Generally speaking, braking time is http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php so short that HEV can only reclaim quite limited energy using the conventional charging means and can’t exert the quick charging potential of NiMH battery. Therefore, it is necessary to research the receptivity of NiMH battery during quick charging process, and offer theoretical basis for improving the energy recovery rate further.In regenerative braking process, the braking energy recovery rate have close connection with the working condition of motor/battery. It should be assured that the joint efficiency of motor and battery is maximal in regenerative braking control strategy. So it is important to research the joint efficiency characteristic of motor and battery in regenerative braking process, and control them working efficient for improving braking energy recovery rate.Focus on the CVT Hybrid Electric Vehicle with ISG, deeply theoretical researching and experiment performance evaluation have been completed in this paper.
　　The main results are shown as follows:1. Based on analyzing NiMH battery charging characteristic, quick charging theory and the feature of regenerative braking, an optimal charging means is proposed. Through this mean, the max charge current is obtained, which can assure that the temperature rise of battery don’t exceed the specify value, and the charging receptivity of battery is determined. Based on this charging mean, the regenerative braking control strategy is proposed, finally the quick charging model of battery is modeled and simulated, whose results indicate that it can be assured to recover the braking energy maximally and charge the battery quickly and safely. 2. The operation characteristic of BLDC is analyzed. According to the performance experiment data of HEV ISG BLDC, combined with the working principle of BLDC, the mathematic model of BLDC is established. The dynamic response curve of BLDC model under specific torque aim signal is simulated and analyzed which verifies the exactitude of this BLDC model.3. According to the characteristic of the battery quick charging http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php and ISG motor generating with high efficiency, the changing rules of motor generating and battery charging efficiency are analyzed, and the joint efficiency model of motor/battery is established by which synthesis efficiency curves of battery and motor at different inputs are calculated.
　　Finally the optimal joint working curve of motor/battery is assured which establishes a basis for the regenerative braking control strategy and the performance optimum of regenerative braking system.4. Models of the parts of regenerative braking system in Matlab/Simulink environment are built. These models are simulated under the typical braking modes and the typical city driving cycles, while these models are simulated in the condition of motor/battery working together with high efficiency and motor working lonely with high efficiency. The results indicate that the braking distance and the duration of braking, using the regenerative braking control strategy and motor control strategy in this paper, can satisfy with the requirement of vehicle braking safety. Compared with the regenerative braking strategy considering the motor working lonely with high efficiency, the regenerative braking strategy considering motor/battery working together with high efficiency can increase the Ball Neodymium Magnets recovery rate further.5. According to the system configuration and parameters of CVT Hybrid Electric Vehicle with ISG, the test platform of HILS for regenerative braking system is built, and control parameters for braking system is adjusted on line. Based on the HILS, braking performance experiment for the test system is done, which establishes a basis for perfection and optimum of hybrid electric regenerative braking system.

Design on a Brushless DC Motor Distributed Control System

　　Design on a Brushless DC Motor Distributed Control System
　　Brushless DC motor (BLDCM) is a new type of motor which is developed due to the development of the power electronics, control theory and motor control technology.BLDCM has been widely used in industrial applications because this motor not only has the merit of the AC induction motor for simple structure, reliable operation and easy maintenance but also has the merit of the DC motor for high performance and easy control. The brushless DC motor neodymium prices without using position sensors can reduce the extra cost and system size, and it also can enhance the reliability of the system.On the basis of the summary for developments and applications of brushless DC motor control system, the thesis introduces the structure and operational principle of BLDCM, then presents the mathematical models, and discusses the method of BLDCM rotor position detection which test the Back-EMF signal.Besides these the circuitry design of detecting rotor position is also presented in this thesis.In this thesis, the hardware and software design of the digital control system is dissertated in detail. The controller of the hardware of the system is built by using the TMS320LF2407 as the microprocessor. The http://www.999magnet.com/products/142-neodymium-prices design of detail circuit includes: the Back-EMF signal detection circuit, current detection circuit, rotor position and speed detection circuit. Besides, the drive circuit of the brushless DC motor is designed with IR2130.The software of the system includes: initialization program of DSP, open-loop commutation start-up program, the phase switching program and so on. Those programs achieve that the PWM generating, the open-loop commutation start-up, the phase switching, the control of current, speed, position.Finally, the thesis presents the simulation model of a BLDCM control system by using MATLAB/SIMULNK. By the model, the electromagnetic torque, rotate speed and back electromotive force cures are presented. The simulation results testify validity of the Back-EF detection and prove the rationality of the control system.

直流无刷电机光伏水泵系统控制研究

　　直流无刷电机光伏水泵系统控制研究
　　This paper analyses the realization of "neutral simulator", then use circuit tomeasure the "across the zero point". This paper also thinks over how to use the circuit inhigh voltage sensorless Bldc motor, use the circuit to realize the precision changing ofcoil.The Photovoltaic pumps SYstem select the sensorless Bldc motor to drive the pump.We also select the microchip PIC16F877 Cast Alnico Magnet made by MicroChip Co.Ltd as a control chip torealize micro-computer control. This system use three separate channel to find out the"across the zero point" of each back-EMF. The program use digital filter to wipe off thePWM interferences and the commutating interferences. In this paper we discuss how torealize the CVT or MPPT in Photovoltaic pumps system, and program the software.The results of the experiment show that this system,which is made on the base ofthe theory above, can control the sensorless Bldc motor to complete the exactcommutation. The system presents good static http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php and dynamic performance. The drawbackof the system is show in the end. We also give some advice for improvement.

Design and Realization of the Servo System for Tiltrotor Model Bench

　　Design and Realization of the Servo System for Tiltrotor Model Bench
　　Tiltrotor vehicle is a new concept of aircraft which is the combination of rotor aircraft and wing aircraft. In the aerospace research field, tiltrotor model bench plays important roles in the research and development of tiltrotor vehicle.It can simulate all kinds of tiltrotor vehicle stance and reappear its dynamic characteristice, so that the performance can b
　　Design and Realization of the Servo System rubber magnetic sheet for Tiltrotor Model Bench
　　Tiltrotor vehicle is a new concept of aircraft which is the combination of rotor aircraft and wing aircraft. In the aerospace research field, tiltrotor model bench plays important roles in the research and development of tiltrotor vehicle.It can simulate all kinds of tiltrotor vehicle stance and reappear its dynamic characteristice, so that the performance can be tested by simulation of tiltrotor vehicle’s subsystem and its related components; the bench can also check whether the systems or the components can fulfill the whole design performance.The dissertation takes the tiltrotor model bench as object, and studies the design and realization of the rotor model servo system.First of all, according to the technical indicators of the bench, an electromotion scheme of the servo system is designed. It replaces the electrohydraulic servo system and overcomes the shortcomings of the electrohydraulic servo system.Secondly, by establishing and analyzing the tiltrotor model bench, the rotor model operation which used to drive rotor for the collective pitch control and the cyclic pitch control on the tiltrotor model bench is achieved .The PMLSM is used as an actuator, and the PID control and the feedforward control is taked.a compensation method for dynamic load which is caused by rotor rotation is presented base on http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php structure-invarient theory.Finally, the test control software is designed using C++ language.This software can realize these functions: system self-check, system initialization, rotor pitch control, display and save of transform matrix, document print etc.
e tested by simulation of tiltrotor vehicle’s subsystem and its related components; the bench can also check whether the systems or the components can fulfill the whole design performance.The dissertation takes the tiltrotor model bench as object, and studies the design and realization of the rotor model servo system.First of all, according to the technical indicators of the bench, an electromotion scheme of the servo system is designed. It replaces the electrohydraulic servo system and overcomes the shortcomings of the electrohydraulic servo system.Secondly, by establishing and analyzing the tiltrotor model bench, the rotor model operation which used to drive rotor for the collective pitch control and the cyclic pitch control on the tiltrotor model bench is achieved .The PMLSM is used as an actuator, and the PID control and the feedforward control is taked.a compensation method for dynamic load which is caused by rotor rotation is presented base on structure-invarient theory.Finally, the test control software is designed using C++ language.This software can realize these functions: system self-check, system initialization, rotor pitch control, display and save of transform matrix, document print etc.

Design of Multifunctional Experimental Platform for Fully Digital Motion Control System

　　Design of Multifunctional Experimental Platform for Fully Digital Motion Control System
　　Motion control system, with the characteristics of high practice, rapid update and great teaching difficulty, etc, is the core curriculum of electrical automation major in college. Designing a high open experimental platform fitting for teaching which is matched with the present contents of teaching is necessary, and on which the integrated and designing experiments can be carried out. At the same time, the technologists researching to motion control system are becoming more and more in recent years. In order to verify a new control scheme or algorithm, lots of manpower and material resources are spend on building an actual system, so that the research efficiency is greatly magnetic materials reduced. For these reasons, it is with practical application values to develop a multifunctional, open and fully digital experimental platform for motion control system.In the thesis, with DSP-TMS320LF2407A as the core controller, an open and fully digital experimental platform for motion control system which takes master-slave computer architecture and faces with DC, AC, PMSM and BLDC, etc, is proposed. The whole design scheme of the experimental platform is given out. The PC takes charge of task management, parameter regulation and curve display.
　　The DSP executes the control program of the motor and auxiliary functions.The design scheme of hardware for DSP control system is particularly introduced, including the makeup and the design flow of IPM power conversion circuit, the minimum system of http://www.999magnet.com DSP, the current detection circuit, D/A conversion circuit, communication interface circuit and control panel, etc. Concentrating on AC motor, the program of open-loop V/F variable-frequency-adjustable-speed system based on three modulation methods and the program of close-loop slip frequency vector control system are both developed. The program is composed of module structures, and is suit for extending.Through lots of experiments carried on the platform, the results show that the research and development for many kinds of motor motion control system which is with high openness, multifunction, and excellent operating interface, is feasible and that the platform is with extensive practical application foreground.

Research and Design of Motion Controller Based on MCX314

　　Research and Design of Motion Controller Based on MCX314
　　Motor control technique is the synthesis apply of micro-electronics, power delectronic, sensor, permanent magnetic material, automatic control and microcomputor application techology. Simulating realization of motor control strategy is gradually dropping out of historical stage. Adopted modern means such as microprocessors, FPGA/CPLD, general-purpose computer and DSP control, digital control system are developed rapidly. Applied advanced algorithm, total digitization intelllgent control system will become heading of newer generation of motion control system design.
　　At present, the domestic research of open Neodymium Magnets NC system is still in its infancy, the structure of each adopted system is not consistent, but is to create one’s own system, so the systems are lack of compatibility and interchangeability by each other. Be aimed at the insufficient of above, the article mainly put motion controll system on microcontroller and special-purpose chip, matching with control software to accomplish the basic function of system, the software and hardware of system has flexibility and interoperability.Among the project we select NOVA electron corp. DSP control special-purpose chip MCX314, mixed with 8-bit high-speed microcontroller C8051F020 which produced by Cygnal company. High-integrated MCX314 can implement 4-axes 3-linkage and control location,velocity and acceleration. MCX314 can implement beeline and arc continuous interpolation, as well as position closed loop control.MCX314 bring control great convenience http://www.999magnet.com/products/110-sintered-neodymium-magnets because of its choice performance, simple interface, convenient programming and work reliably, can be applied to numerical control machine tool, robot, etc. In improving speed control and interpolation algorithm,adopt to mix up fuzzy control and neural network,which have improved controlling function.The task of main work includes:1. General scheme of the motion controller, and put forward after comparing domestic and foreign kindred products’functions.2. The testing software design of motion controll,including some basic performance functions and testing examples.3. Developing application software, acting the controller by transfer the corresponding function.4. Building debugged platform, making some fundamental tests on motion controller , verifying accuracy of software and hardware’s design.5. Researching a high performance velocity control arithmetic and interpolation algorithm based on fuzzy control and neural network.6. The summary of research result and empressing expects to prospect.

The Research on Microstepping Drive for Hybrid Step Motor

　　The Research on Microstepping Drive for Hybrid Step Motor
　　At 70s the subdivision control of stepping motors was proposed to solve the problems such as resonance, output torque reducing and low accuracy when the stepping motor is running at open-loop. This thesis mainly analyzes the theory of subdivision and realizes the subdivision of the three phase hybrid stepping motors with digital control.Firstly, this thesis neodymium prices study the characteristic the magnetic filed and stator current of stepper between the PMSM and stepping motors, which indicates that they are similar. From the structure and operation principle and in a certain assumption, the stepping motor can consider as a PMSM running at low speed. When subdivision is adopted, the current in the stator is sinusoidal. Reference on the AC variable speed theory, the sinusoidal current in the stator can transform into direct current through rotational coordinate transform. The modulation policy is SVPWM which is widely adopted in AC motors control to reduce current harmonics http://www.999magnet.com/products/142-neodymium-prices and noise. Secondly, with the simulation software Matlab/Simulink, the model of the stepping motor is established base on the d-q coordinate. When the different frequency and step angle are set, the responses curves of current in the stator and the position of the rotor are analyzed. The simulation shows that the method is effective. Finally, with the TI DSP TMS320LF2407A as the controller, the subdivision of the stepping motor is realized. Some suggestions are made to make improvements.

Research on the Strategy of BLDC Motor Control Without Rotor Position Sensor

　　Research on the Strategy of BLDC Motor Control Without Rotor Position Sensor
　　A brushless DC motor(BLDCM), though an ac motor, has comparable performance as that of a dc motor, due to such advantages as simple construction, ruggedness, small size, and maintenance free. To control the speed of a BLDCM, hall sensors are usually used for speed sensing and position sensing. However, it would be more economical, if position sensors can be removed from the motor. Thus, this thesis proposes the sensorless control techniques for BLDCMs.This paper describes the operation characteristics and control strategies based on the mathematic neodymium standard state model of BLDC motors. A novel BEMF zero detection method is proposed to avoid the distribution of the high-frequency noise, get rid of the generator neutral point and the filter, solving the problem that exist in the traditional method. And against the difficulty that exist when the motor get started, there are two methods proposed: pre-locating method and zero crossing assisting method. The comparison can prove the validity of the pre-locating method, there’s no reverse rotation and speed fluctuations is small. The torque ripple is a problem needed to be solved too. Against the problem, the reason that cause the ripple is analyzed, and proves the PI controller, realizes the suppressing of the ripple. Here also discuss the speed estimating, too. In this paper the first level method is used to get the accurate speed of the rotor.The http://www.999magnet.com/products/112-neodymium-standard-state strategy above is used to design the BLDCM control system, and it’s studied deeply under the environment of SIMULINK. According to the result of the simulation, it is proved that the designed system is steady and the torque ripple resulting from commutation is limited somehow etc. So the system that studied is feasible.

Design and Simulation of Sliding Mode Observer Controller of BLDCM

　　Design and Simulation of Sliding Mode Observer Controller of BLDCM
　　The brushless DC motor (BLDCM) has been broadly applied because of it’s eminent performance, it is reliable to control with simple structure and convenience to maintenance which is owned by the AC machines, and have high efficiency, good performance of speed regulation as DC machines. So it is widely used in the industry. The traditional theoretical analysis and designing method have been developed maturely It can be said that the wider applications of BLDCM depend somewhat upon the further research on its special control method.Sliding mode variable structure magnetic materials control is characterized with disturbance depression, and insensitivity to parameter alterations. It has been used in motor speed control, position control. The sliding mode observer can evaluate the state of uncertain object and real-time quantities of the object’s disturbance and gotten the good performance of brushless DC motor’s control. In the paper, the sliding mode observer is designed based on the characters of the model of the motor and the variable structure control. The designing method and pole location of the observer are demonstrated. Based on the model of motor the variable structure controller is designed which is insensitive to the disturbance Because of superiority performance and abundant external devices of the TMS320LF2407 control chip, we use this kind chip to design and achieve the hardware http://www.999magnet.com and software system, and control the BLDCM by the control system.This paper use Matlab to build the emulation mathematic model of BLDCM and construct the BLDCM regulation system. According to the control theory of sliding mode observer, the stator magnetic field should be vertical with the rotor magnetic field and be synchronous with rotor rotating, so the positionθand speedωof BLDCM is real-time estimated and the estimated position is modified continuously. Theoretical analysis and simulation results show that the proposed strategy has stronger robustness and satisfactory performance

Research on BLDCM Control System

　　Research on BLDCM Control System
　　Permanent magnet brushless DC motor (BLDCM) has been widely used in various fields, for it is provided with a lot of advantages such as reliability, high energy density, high efficiency and its simple structure. Nowadays energy consumption draws the attention of the world, therefore, the brushless DC motor, with its ever growing value in high efficiency, has become the focus of research. This paper mainly focuses on the project of the speed regulation of brushless Neodymium Magnets DC motor and the controlling strategy of the sensorless brushless DC motor in particular.Firstly, this paper summarizes the trends and developments of the brushless DC motor, and introduces its structure and working principle. Then in light of the mathematical model, the Matlab simulation model of brushless DC motor is established. The dynamic properties in different operating conditions are also studied.On the basis of the study of modern control algorithm and conventional PID control method and the concrete practice of projects, this paper proposes a variable parameter intelligent PI control algorithm. It is applied to the control of the brushless DC motor on the speed link, solving the http://www.999magnet.com/products/110-sintered-neodymium-magnets contradiction between rapidity and overshoot of the conventional PID control and obtaining perfect characteristics of rapid response, non-overshoot and no steady-state errors. In addition, such algorithm is simulated with Matlab, and the good effect of controlling is obtained.This paper researches on the checking of the position of rotor of sensorless brushless DC motor and strategies of the motor’s starting and commuting. Then simulation model of the sensorless brushless DC motor is established. And based on DSP the paper designs the brushless DC motor control system.

Adaptive Independence Electrical Drive Pitch Control Technology Research

　　Adaptive Independence Electrical Drive Pitch Control Technology Research
　　Along with the social productive forces is developed, the energy is demanded more and bigger by the humanity, limited reserves of the conventional energy like the coal, the petroleum and the gas , these energies accurately were the fuel of the renewable cyclical long period. But the wind power take one kind of the green energy that is gradually taken the recognition, now the wind power generation technology rapidly is developed, simultaneously capacity of the single wind magnetic materials turbine unceasingly is increased to cause the pitch technology rapid is developed.In the article the electrical drive pitch system is researched, now the popular pitch technology is the pitch technology of the electrical drive servo system. Is introduced the structure of the electrical drive pitch system and the basic work principle. In the article is proposed the pitch system structure of the permanent magnetism synchronization motor servo system.
　　This article in view of includes the indefinite parameter of the PMSM to use the model reference adaptive control method is designed the control system. When the PMSM is operated the temperature of the stator is increased to cause the stator resistance value is often changed, accordingly parameter of the mathematical model is undefined, when the system is operated to cause control object is changed. The simulation result is showed to use the model reference adaptive control method to obtain the quite ideal control effect.In the article the model reference adaptive http://www.999magnet.com electrical pitch technology is researched, emphatically to select the principle and method of reference model is discussed in the model reference adaptive control, the model reference adaptive control system question of the based on the system input and output with the Lyapunov stability theory and the Popov super stability theory is designed. And this control system is applied in the pitch system in the MATLAB/SIMULINK software to operate the simulated analysis, the simulated result explained the model reference adaptive control method when in pitch system is included the indefinite parameter is increased the responded speed of the pitch angle, the system is had the certain robust to suppress the influence that is changed parameter of the system itself.

Research on the Suspension Rigidity Control of the Movable Beam Used in Machining Centre with Fixed Gantry

　　Research on the Suspension Rigidity Control of the Movable Beam Used in Machining Centre with Fixed Gantry
　　This thesis is supported by Liaoning province educational department’s project "The Research on Electromagnetic suspension Linear Motor and Its Control Strategy in Machine Tools Feeding system" and Shenyang City NSF’s project "The Research on Drive Ball Neodymium Magnets System of Electromagnetic suspension Linear Motor in Machine Tools Feeding system". Advising the practical characteristics of the machining centre with fixed gantry, and aiming at that the movable beam requires more strictly on suspension rigidity than the maglev train, this thesis does research mainly on the control algorithms of electromagnetic suspension system to improve the maglev rigidity.
　　As hybrid magnets combined with permanent material and electrical magnet can solve the problem that the traditional electromagnetic suspension system consumes too much power, this thesis adopts the hybrid electromagnetic suspension technology.Firstly, in order to resolve the rigidity effect caused by the current changes of electromagnet coils, double loop control system is adopted. Then the thesis introduces some common controllers, and chooses PI controller after comparing them. The current inner loop not only improves the dynamic characteristics, but also offsets uncertainty and change. The main work of the thesis is to choose and design outer loop controller by analyzing characteristics of traditional PID algorithm and Fuzzy algorithm, Fuzzy-PID algorithm is proposed. http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php    The composted control model based on the conventional PID regulator employs fuzzy reasoning and accomplishes PID parameters self-tuning according to different error and change rate of error, thus perfect performance can be reached. Considering the tediousness of determination of fuzzy rules and other parameters of Fuzzy-PID controller, the thesis adopts genetic algorithm (hereafter GA) to optimize those rules and parameters.At last, this thesis simulates the above control systems, and analyzes the feasibility and advantage of GA fuzzy-PID controller according to the practical applications. The simulation results have proved that the Fuzzy-PID controller not only improves the suspension rigidity of hybrid magnets system, but also offsets the error, so it is suitable for large-scale machine tool’s requirements, and the optimal effect of GA is perfect, and GA makes the determination of Fuzzy-PID controller’s Parameters more systematical and more scientific.

Study on the General Controller of Single-Phase to Three-Phase AC Motors

　　Study on the General Controller of Single-Phase to Three-Phase AC Motors
　　In recent years, the development and research of the general controller for the motors from single-phase to multiphase obtains much attention. Many kinds of motors in miniature and new style have come into our lives. It seems that the motor becoming more and more pocket-sized, but the controller of motor is also more difficult to design. At present, a set of smart and general controller has been needed urgently, which cannot only meet the motor’s operating, also be used for other kinds of motor with the same power compatibly.In this paper, a set of small capacity and low power general controller for 1-3 phase AC motors has been designed which are used for U-shape single-phase permanent motor, double-phase motor and brushless DC motor that are commonly used in our lives. magnetic materials During the design, it has been divided into three parts that are power inversion, the driving signals of motors and the programming of PIC microchip.Firstly elaborating the control principle of single phase to three phase AC motors,
　　and using single-phase half-bridge converter as the topology unit. The single-phase converter can be expanded into three phase converter as the general controller power circuit. Secondly, the driving part of the controller has been designed based on PIC16F877A microchip including the control signal and the insulation blocking. A kind of control arithmetic as the sinusoidal pulse width modulation has been used to help PIC microchip to produce SPWM by programming. Comparing the asymmetric regular sampling and the symmetric sample, and determines the former as the control method, which is used to produce SPWM by programming with PIC. Finally, the empirical data have http://www.999magnet.com been gathered. The problems and the technical prospects have also been analyzed, and also forecasting this kind of technology and the application values.The appearance of the general controller has largely saved the factory cost of the motor’s control, and it makes the motor more convenient and the control method simpler. Also it is probable for the inversion to be large capacity and high performance. Therefore it is extremely vital significance to research and develop the general controller for the motors from single-phase to multiphase in the technology and the application.

Research on Food Heater Based on Rotating Electromagnetic Theory

　　Research on Food Heater Based on Rotating Electromagnetic Theory
　　With the rapid development of economy、the continuous variation of population structure and the innovation of economic structure, energy consumption is rising rapidly and energy security issue becomes the focus of energy development. Electric heating technique which can prevent the pollution of the environment, is recognized widely. Therefore, electrothermics is developed to a cross-subject which includes many subjects such as electrical engineering, pyrology and material science. Based on the flameless electromagnetic heater(Patent Number is 200410044061), magnetic materials this paper represents the foundational research on its calefaction parts that food heater.
　　Firstly, the thesis introduced the variety and application of electric heating, and showed the new concept that dynamic electromagnetic induction; The thesis introduced the heating technology in the war in china and abroad, and analysed the advantage and the disadvantage of these heating ways.Secondly, the thesis refered the structure of the food heater and its operation principle, and established the equivalent magnetic circuit model. Then from the point of view of the reverse problem of temperature rise of electric machines, thesis established the exothermic model of the heater based on electromagnetic field and experiential formulae.Thirdly, the 2D finite element analysis model of the heater what had the similar structure like the permanent-magnet synchronous motor was founded in the thesis. The thesis analysed the distributing rules of static air gap field and the distributing instances of leakage flux, and assessed the change of air gap field altering the size of air gap field and the direction of magnetism. Then from the point of reduced leakage flux, an optimizational structure was brought forward in the thesis. Compared the air gap field of the improved and primary structure. When the rotating http://www.999magnet.com speed was invariable, the heating powers of the heater were analyzed. The values of the heat powers in different rotating speeds and their changing regularity versus rotating speed were given in the thesis. The thesis assessed the optimizational structure from the point of heating power and torque characteristic, and verifies theoretically that the improved structure had an advantage over the primary one.At last, the experiment equipment was designed. The temperature rise curve of the heater was measured, and it was compared with the simulation results.

Research on Simulation Environment of AC Servo System

　　Research on Simulation Environment of AC Servo System
　　With the rapid development of electron and computer technology, AC servo system, which is the foremost system of electric servo systems, has already developed to full-digital. AC servo system needs servo programs to support its closed-loop feedback control. For the program’s quality affects the whole control system’s performance directly, so the program should be tested strictly and repeatedly. However, the present method of program testing depends on hardware entirely. This method leads to a long developing circle and are inefficient and costly, which make the AC servo product hardly to survive in the cruel market.To provide a kind of software testing magnetic materials environment and realize the system testing without hardware entirely, this dissertation present a new way, which is developing an AC servo system simulation and development environment. This software can recognize, parse and run the control programs. It also contains the controlled objects and the simulation modules of some other critical hardware so as to make the testing of programs independent of hardware. The main realization step are as follow, first pre-process the program code, and then pick up the effective information of the program. Subsequently use the information and call the modules of critical hardware and controlled objects to get the value of feedback variables which can be used in the next calculation. Finally, simulate the whole closed-loop feedback control system and output the results of simulation, which can be used by developers to judge the control performance.This paper has already finished the http://www.999magnet.com parts of program’s recognition and the simulation of programs’running process. Mathematical models of Permanent Magnet Synchronous Motor (PMSM) and Intelligent Power Module (IPM) have been built, too, including their solutions. The running process of the whole close-loop system has been realized primarily. And the realization method of the servo simulation system is reasonable and feasible, testified by the AC servo testing platform.

Research on the Electric-Motorcycle Controlling System Based on the ST7FMC

　　Research on the Electric-Motorcycle Controlling System Based on the ST7FMC
　　In recent years, the waste gas from the gasoline-automobiles has caused severe pollution problems in cities, and people’s living standard and consciousness of environmentalism have been improved. So, it’s more and more important to develop the so called "green-automobiles". Considering our country’s status, to develop the electric-cycle will be helpful to solve the pollution problem.With the enhancing driving-motor technology and power devices technology, the Neodymium Magnets control system developed quickly. But nowadays, most of the electric-cycle products in the markets adopt low-integration degree devices in their control system. The problem is that the function of these devices is too simple to fully utilize the system’s potential and to solve some specific but meaningful control questions.
　　In this project, ST7FMC-an ST-series MCU product of ST company has been used to design the electric-motorcycle controlling system with low-cost and good-controlling performance .And the following works have been presented in this project:Firstly, the characteristic of the system’s driving source-the BLDC- has been analyzed based on the mathematical model. Furthermore, the controlling strategy has been designed in detail based on the characteristic of the ST MCU. This part includes the following works: in order to guarantee the velocity modulation’s performance and the current sampling’s precision, a double loop control for current and velocity has been adopted and the control strategy is realized by the software using PI algorithm ;in order to get the accurate velocity calculation, an inherent register has been used; in order to get the correct average phase current ,the http://www.999magnet.com/products/110-sintered-neodymium-magnets method of measuring the instantaneous value of the DC link current during the middle of PWM on time has been used ; in order to drive the MOSFET full-bridge inverted circuit, the high-performance driving-IC IR2136 has been used; and a new‘convex-wave’controlling method has been adopted as the driving method.At last, an experimental electric-motorcycle has been setup and making the observations outside.From the work which has been done in this project, the conclusion can be drawn that the electric-motorcycle controlling system based on the ST MCU has the virtues of high performance and high reliability. This paper presented an experimental base for the further research.

Development of Automatic Locking Device for Magnetic Bearing Flywheel

　　Development of Automatic Locking Device for Magnetic Bearing Flywheel
　　Magnetic suspending is a technology, which utilizes magnetic power to make objects suspending without mechanical touching, it is also an all-around technology relating to several subjects. Nowaday, the controlling of a satellite stance is usually achieved by controlling the change of the angular momentum for a flywheel.
　　The system of magnetic bearing flywheel has several characters, such as without friction, dispensing with lubrication and high-speed running, and it is applied in satellites very much.During the satellite launching, the locking of Magnetic bearing flywheel is a key technology. In order to protecting flywheel from being damaged, the system of magnetic bearing flywheel, including the flywheel rotor, needs to be locking during the satellite launching, and in the orbiting of the Alnico Magnets satellite, it also needs to be loosing to make the rotor suspending. Although the static magnetic force of the magnetic bearing could maintain the rotor during the satellite launching, it utilizes additional locking device in many business applications of magnetic bearing flywheel. It can provide locking force for flywheel by locking device during launching to make the rotor fixing on the surface of the taper bush, and loose it in the satellite orbiting to make the rotor suspending as the free state.First, the motion mechanism is designed, which consists of power supply, transmission part, implement part and sustentation part, and a whole project of mechanism could be obtained according to this. In the locking project designing of the mechanism, several projects are enumerated, and an optimal one has been selected through comparing them with each other. Then the motion control system is designed. In order to controlling the mechanism motion efficiently, a http://www.999magnet.com/products/108-alnico-magnets control system with an active feedback loop is chosen, which could ensure implement part working in its safe journey. Obviously, in order to making the mechanism automatic locking and loosing, a molectron, core of microcontroller, is designed, and a long-distance control is achieved by utilizing serial communication module, which could transfer the information between microcontroller and main computer.When the mechanism and its control system are designed, an experiment of the system could be maken on, and it could not only adjust the locking force of the mechanism efficiently, but also optimize the whole system and bring its capability reaching optimization level.At the end of this paper, it summarizes all of the development of the automatic locking system, and prospects the next further research.

The Research of a Novel Stator Section Crossing Method of Long Stator Linear Synchronous Motor for High Speed Maglev Vehicles

　　The Research of a Novel Stator Section Crossing Method of Long Stator Linear Synchronous Motor for High Speed Maglev Vehicles
　　The paper reviewed the domestic and overseas nowadays state of the application of linear motors in the Maglev train. This paper proposes a new stator section crossing method that can overcome the drawbacks of the existent tow-step and three-step methods used in Shanghai maglev railway after analyzing the tow-step and three-step section crossing methods. The new method has no descending of propelling force and idleness of PWM converters. The neodymium standard state mathematic model and vector control strategy of the permanent magnetic long stator linear machine (PMLSM) are also researched in this paper. The effectiveness of the proposed section crossing method and control approach are validated by simulation results.To find out the way of implementation of the new section crossing method the paper researched the electronics controlled permanent magnets vacuum breaker. The electronics control system was designed and we can close and open the 3-phase vacuum breaker at the preset time separately. We also researched the application of the thyristor switch in the new section crossing method. According to technical instruction of Shanghai Maglev railway we fixed the appropriate thyristors and find out how to average the voltage among the thyristors in http://www.999magnet.com/products/112-neodymium-standard-state series at dynamic and steady state. A thyristor based and developed for the new section crossing method’s switches system was realized. The new section crossing method has been actualized in the thyristor system.

Low Cost Switched Reluctance Motor Drives

　　Low Cost Switched Reluctance Motor Drives
　　Most advanced manufacturing processes require precise motions for material transfer, packing, assembly, and electrical wiring. To achieve precise motions, most of these high-performance manufacturing machines use X-Y sliding tables with permanent-magnet motrors. Though this method is most widely used, it has disadvantages of low accuracy, high cost, and low reliability.This thesis describes the position control of a switched reluctance motor for high-performance motions in manufacturing automation. The proposed actuator has very simple structure and it can be Alnico Magnets manufactured easily. There is no need for magnets and windings in the rotor. The actuator is extremely robust and can be used in a hostile environment.Because of the characteristic of the high nonlinearity of the motor, a novel control method, using the plug-in robust compensator and the torque linearization technique, is developed for precision position control of the actuator. Simulation and experiment results of the motion system indicate that the system has good performance.In this thesis, the following parts are included:(1) An effective switched reluctance motor model is offered, which can be used universally without complex changes for switched reluctance motors with different geometry dimensions.(2) The characteristic of the switched reluctance motor is highly nonlinear due to the complex electromagnetic circuit, and the torque generation has high torque ripple, so a novel two-stage torque linearization scheme is developed to http://www.999magnet.com/products/108-alnico-magnets perform the torque linearization.(3) The present literature on switched reluctance motor development seldom targets high-precision position control applications. However, position control is considered in this research. Firstly, the conventional PID control is employed. Secondly, a robust controller is designed, which is divided into two stages for the design, a 2DOF