Research on Applying Kaiman Filter to Control the Response of an AC Servo System

　　Research on Applying Kaiman Filter to Control the Response of an AC Servo System
　　High performance PMSM servo systems have a wide application in there region of industrial automation, numerical control and robot .Servo systems are further researched and developed by many scientific research institutions .A servo drive based on DSP and IPM is designed in this thesis. Much debugging and experimentation on the system have been done. Theoretical study and simulation are carried out on improving the performance in the low speed region.Firstly ,according to the detailed analysis on the mathematical model of PMSM, the principle of field Oriented Control(FOC)is illustrated. SPWM and SVPWM are analyzed and contrasted in detail too, and the digital realization techniques based on DSP are given. Then the hardware frame of the servo Alnico Magnets driver is introduced, especially the design of the DSP minimal system, current detecting circuit, speed and position-acquiring circuit, power circuit based on IPM are further researched. The software frame of the servo system is introduced and the flow chart is given, Many experiments have been done on improving the speed and current response performance. The experimental result has shown that high speed performance is satisfactory while speed performance is poor in the low region, Ripple of speed is serious in low speed.Low speed control performance has much more influence on the precision of servo systems. To improve the speed response in low speed region is very useful to servo systems. So Extend Kalman Filter (EKF) is applied to low speed control of AC servo systems in order to identify the information of position of magnet poles and low speed instead of incremental edcoder. In high speed region, encoder is still used to acquire speed information. The simulation of AC servo system with EKF has good static and http://www.999magnet.com/products/108-alnico-magnets dynamic performance. Especially in low speed, this method has good motor position tracking performance and speed tracking performance. So with this method, the static and dynamic performance can be guaranteed in the whole speed range.

Study on the DSP Control System of the Grid-connected Inverter for Wind Energy Conversion System

　　Study on the DSP Control System of the Grid-connected Inverter for Wind Energy Conversion System
　　Wind energy due to its clean and renewable character has developed rapidly in recent years and ranks as one of the most promising renewable energy resource. This dissertation is a part of the project of developing MW-level Wind Energy Conversion System which is a key 863 program. It is mainly about the wind energy conversion system with a rated output of 1.2MW which applied to the variable speed constant frequency wind energy system (VSCF). The focus is on the control method of the inverter in the electrical energy conversion system.This paper first generally describes the wind energy conversion systems, and introduces the developing status and the technological development trend of wind power both in China and abroad. Nowadays high-level power direct-drive and gear-drive are the two main wind power generation technology. It utilizes the AC-DC-AC conversion configuration to deliver the high-level power energy from permanent-magnet generators to the grid, the Neodymium Magnets power rating is 1.2MW. The absence of gearbox and less maintenance required makes this constitution having more developing forefront.In the second chapter of the dissertation, it firstly introduces the aerodynamic force characteristic of the wind turbine, and describes different control strategy of wind turbine in different wind speed. Then it mainly talks about the two VSCF technologies, the direct-drive and gearbox/induction generator technologies, used in wind power generation system.In the power conversion system, the important section is grid-connected. It delivers the power of wind energy in the conversion system to the grid. The focus of this chapter is the main circuit constitution and working principle, and theoretical derivation is given and analyzed.The main circuit parameters of the 1.2MW conversion system are selected through theoretical derivation and calculation, including the DC side capacitors, the grid side inductances, the three-multiple boost inductances, the filtering capacitors behind the diode-bridge rectifier http://www.999magnet.com/products/110-sintered-neodymium-magnets and the grid side filtering capacitors. The switching tubes used in the 3 boost converter and two-multiple inverter are selected. The loss and the junction temperature of these switching tubes are also calculated.The instantaneous current control method is used in the grid-connected inverter. The PI parameters of the outer voltage loop and the inner current loop are determined in the experiment, and the closed loop control experiment is completed.The high speed integrated control chip DSP2407 is the core of control. At the mean time, an experiment platform of wind energy conversion system is constructed and the experimental waveforms are presented and analyzed in this paper.

Quantitative Study of the Effect of Magnetic Fields on Scale Deposition on Nanofiltration Membranes Via UTDR

　　Quantitative Study of the Effect of Magnetic Fields on Scale Deposition on Nanofiltration Membranes Via UTDR
　　The lack of water resource and the serious water pollution in the world are influencing the life and the development of society economic deeply. Nanofiltration and Reverse Osmosis is playing a more and more important role in resolving the lack of water resource and water purification. In the membrane processes, however, membrane fouling weakens the separate effect and limits the further extension of membrane separation technique. The study on the neodymium prices mechanism and the control of membrane fouling has been paid extensive attention to by boffins all over the world. This study introduces the magnetic water treatments into Nanofiltration process, and describes an existing ultrasonic technique for quantitative study of the effect of magnetic fields on the CaCO3 scale deposition on the membrane surface during crossflow nanofiltration (NF).The effects of magnetic fields on some physico-chemistry properties of Ca(HCO3)2 solutions and the crystal morphology were investigated systematically. The permanent and electro magnetic fields used in the experiments are 0.4T and 0.02T, respectively. Results show that magnetic field enhances the conductivity and pH of the treated solution and its effect depends on the concentration of the solution. The influence of magnetic fields declines with the increase of solution concentration. The magnetic effect also affected by the flow rate and the pH of the solutions. In addition, the magnetic treatments promote the formation of aragonite and vaterite from calcite.
　　The results obtained in the experiments of crossflow nanofiltration show a good relationship between the ultrasonic measurements and the development of CaCO3 scale on the NF membrane surface. The amplitude of the ultrasonic signal increased with the deposition of the CaCO3 scale on membrane. Furthermore, the ultrasonic technique is capable http://www.999magnet.com/products/142-neodymium-prices of measuring the rate of fouling layer formation under different treatment conditions, i.e. with non-magnetic field, permanent magnetic field and electromagnetic field. The permeate flux of NF membrane declined slower and the thickness of the scale layer obtained by ultrasonic and weight measurements was thinner in the experiments with PMF and EMF. The SEM and XRD analyses imply that the magnetic treatment suppresses the formation of calcite crystals and prefers to vaterite and aragonite. The CaCO3 crystal deposited on membrane surface is lessregular and looser, resulting in the decrease in the thickness and density of fouling layer and the slower flux-decline of NF membrane. These correspond with the lower increase in the amplitude of the ultrasonic response signals, the effect of magnetic treatments is normally related to the the magnetohydrodynamic (MHD) mechanism.Overall, the independent measurements such as the flux-decline data, weight measurement and SEM analysis corroborate the ultrasonic measurements. The ultrasonic technique has provided an effective measure to evaluate the prevention and control of membrane fouling.

Design and Research of Damper Based on Smart Material Excited by Magnetic Field

　　Design and Research of Damper Based on Smart Material Excited by Magnetic Field
　　Both giant magnetostrictive materials (GMM) and magntorheological fuid (MRF) are smart materials which has the potential to be used in the vibration control and some other technology fields because of their inherent excellent properties. GMM and MRF are both excited by magnetic field which is generated by electric current or permanent magnet. Scientists all over the world focused much attention on the preparation and the mechanical properties of GMM and MRF, and the control strategies of the equipments which consist of the two materials. Several significant achievements have been obtained in these fields, however, few literatures details the analysis and the Neodymium Magnets design methods of the magnetic circuit in GMM actuators or MRF dampers, which are the primary coverage of this paper. The main points are such as the following two parts:1. Design and research on GMM actuatorIn order to meet the requirement of large output force in vibration suppression of civil engineering structures, a high-power GMM actuator consists of Terfeno-D, which is a kind of alloy made from several rare earth-irons, has been fabricated.
　　The static force and the displacement it can generate were more than 5.5 ton and 250μm, respectively. The detailed design method, especially about the permanent magnetic circuit, was given and the feasibility of the method was testified by Finite Elements Method (FEM) analysis with the usage of the commercial software Ansys. Besides, the key parameters such as the dimension of solenoid and the distance between the permanent magnets which affects the performance of GMM actuators greatly were studied. In the process of the above analysis some new http://www.999magnet.com/products/110-sintered-neodymium-magnets phenomenon were found and explained. An elementary investigation of calorific characteristics of GMM actuators was also carried out.2. Design and research on MRF damperComprehensive FEM static magnetic analysis of MRF damper was performed. Many main structural parameters, which significantly influence the magnetic features of MRF dampers, such as the gap between the piston and the house of damper, the distance between the current-carrying coils etc., were studied. Then some effective new ways to optimize the magnetic circuit were introduced.

Research on Bldc Motor Control System Applied in Power Wheelchair Based on DSP

　　Research on Bldc Motor Control System Applied in Power Wheelchair Based on DSP
　　With the more and more severe influence of aging of population and improving of living standard, aged-elder as well as handicapped will cry for aid walk instruments. As the central part of electric wheelchair, controller will directly influence its performance. So it has profound significance to study controller of electric wheelchair.Although conventional DC motor always takes up dominant station in driving system, its mechanical commutator and brush result in limited capability, low reliability, big noise. People manage to develop more quiet, high efficiency and reliability,  neodymium prices big capability driving motor. With the development of the power-electronics and micro-control technique, permanent-magnet brushless DC motor which has small volume, light weight, high efficiency, low noise, big capability and reliability appeared and matured, so it is hopeful to become main motor applied in electric-wheelchair.This dissertation presents a solution to control a permanent-magnet brushless DC motor using TMS320LF2407A.
　　This new family of DSP enables cost-effective design of intelligent controllers for brushless motors which can fulfill more conditions, consisting of fewer system components which can fulfill more conditions, consisting of fewer system components, lower system cost and increased performances. The research is divided into five part: the mathematical model is http://www.999magnet.com/products/142-neodymium-prices built and the control structure, technology, strategy and chip are confirmed by the timing principle, the Matlab/Simulink simulation which aimed at the BLDC motor control system has been executed;many parts of servo system are selected in the paper;based on TI’s DSP-TMS320LF2407A and IR’s driving chip-IR2130 and MOSDFET-IRF2807 the hardware circuit is designed;working out initialization programme of some main components and the whole frames, and with assemble language of DSP and C, the software programes is written;the validity of control method presented in the paper is verified by simulation and analyze.

基于串行总线运动控制器的开放式数控系统研究

　　基于串行总线运动控制器的开放式数控系统研究
　　Open architecture numerical control system is an emphasis of CNC technology research. The level of open CNC technology influences the development of the nation manufacture, so to research and to develop an open architecture CNC system with self-intellectual property are meaningful for our country.This paper discusses the system structure of open architecture CNC system deeply, and analysis the servo system and CNC soft development trends of the open CNC. Based on the research work of CNC system and the advantages of the existed open CNC system, this paper put forward a new open CNC structure with a new architecture of off-line interpolation and real-time control. In the paper a scheme for building the open CNC system by this way is given.
　　The reality open architecture in Alnico Magnets the hardware of CNC system has come true.The motion controller is an important part of the open CNC system based on serial real-time control network. The motion controller based on serial bus called axis servo controller is not only the important part of the new architecture which expound in this paper, but also a key link for bringing about open CNC in the hardware layer of CNC system. The paper expatiates on emphasis of the design for the axis servo controller using ASIC and microcontroller.The object that the axis servo controller wants to control in this paper is Permanent Magnet Synchronization Motor (PMSM). PMSM is a new type motor with many strong points, and will probably be used widely in servo control field in the future.In this paper, the Space Vector PWM (SVPWM) is used to design the PMSM servo controller by analyzing the math model of PMSM. It chooses the nine point controller to make a position http://www.999magnet.com/products/108-alnico-magnets controller, and uses fuzzy PI parameter adjust to make the PI controller in current loop and velocity loop control to have self adapt ability. The paper expatiates on the course of how to design and realize the axis servo controller for PMSM. At last, it approves the design train of though through simulation by MATLAB.

Vehicle Motor Drive System

　　Vehicle Motor Drive System
　　This dissertation is devoted to the study on permanent magnet synchronous motor (PMSM) drive system in electric vehicle (EV) application, which include three aspects as below:1. According the loading of EV running conditions, the i_d=0 strategy has been used in current control. being aimed at improving the dynamic performances of EV driver in the complex running conditions of EV motor, a new velocity controller has been adopted, witch uses the capability of fuzzy logic in handling uncertain information and hold the PI speed controller, updating the output Neodymium Magnets of the speed controller real time.2. A DSP-based full-digital vector control inverter for PMSM used in EV has been developed, which contains the software and hardware design.(1) hardware system which rated capacity is 75kW has been developed :1)the design of high-power main circuit 2) the design of control circuit based on DSP TMS320LF2407A.(2) the realization of arithmetic of vector control for PMSM based on fuzzy controller, which including:1) In order to restrain the influence of the back EMF in current control loop, and avoid the problem that the dynamic response overshoot caused by increasing the parameter of PI controller, a separated integral PI controller has been adopted.2) http://www.999magnet.com/products/110-sintered-neodymium-magnets realizing the fuzzy velocity controller designed in the paper.3) Voltage using efficiency of accumulator in EV has been improved by the design and realization of software SVPWM, and the harmonic of modulate voltage has been decreased.3. The experiment has been done for the driver which design in this paper. Result of experiment give the proof of the performance of the driver reaches the request of design.

Observer Designs for Sensorless Linear Servo Systems

　　Observer Designs for Sensorless Linear Servo Systems
　　Permanent magnetism linear synchronous motors (PMLSMs) have beenwidely used for servo systems with high speed and high precision, due to theirhigh efficiency, high reliability and no magnetizing current. Motion control ofPMLSMs requires accurate position and velocity signals to realize fieldorientation. In conventional servo systems, mechnical sensors are used for thispurpose. However, these additional sensors increase the costs of the systemand decrease the reliability. Therefore, it has been an attractive prospect ofavoiding position and velocity sensors for the neodymium prices purpose of sensorless servosystems with low cost and high reliability.
　　The thesis focuses on severalrobust estimation methods on sensorless operation for PMLSM.Traditional sliding mode observer has the characteristics of adaptivityand robust to parameters perturbation and external disturbances, butchattering exists in the sliding mode. In order to weaken the chattering, speedis estimated by the second-order sliding mode super-twisting algorithmmodified. This method is of strong robust and fast convergence. The thesispresents two strategies of sensorless operation for PMLSM. Two-time-scaleof singular perturbation is applied to decompose the PMLSM’s model in thestationaryαβcoordinate into fast subsystem and slow subsystem. Theposition estimated method is proposed based on sliding mode observer - backelectromagnetic force (SMO-BEMF). And speed is estimated based on second-order sliding mode super-twisting observer in the slow subsystem.Considering the nonlinear terms of PMLSM’s model satisfying Lipschitzconditions in the rotationary dq coordinate, the observer design is discussedfor Lipschitz nonlinear systems in the presence of bounded disturbances. Newstable conditions have been found to http://www.999magnet.com/products/142-neodymium-prices guarantee observer error dynamicsconvergence expressed by means of LMI. And the position is estimatedthrough SMO-BEMF estimation method.With MATLAB/SIMULINK, a general simulation support is establishedfor PMLSM servo systems controlled by SPWM vector current sluggishtracking, according to PMLSM and vector control principles and computermodeling and simulation technologies. Simulations for estimation strategiesabove are performed on the support. Successful simulation results areobtained, and illustrate the feasibility of observer designs to realize sensorlesscontrol for PMLSM servo systems.

Comparative Study on Mechanical and Electromagnetic Performances of High Speed IM with Different Rotor Structures

　　Comparative Study on Mechanical and Electromagnetic Performances of High Speed IM with Different Rotor Structures
　　The high speed induction machine has been widely investigated since it has small size, high efficiency and power density. The permanent magnet material has small tensile strength and cannot withstand the large centrifugal force due to the high rotation speed, so the mechanical performances of the permanent magnet machine are poorer than the induction machine’s. At the same time, the electromagnetic performances of the reluctance machine are poorer than the induction machine’s. So the induction machine for high speed operation has the actual significance. For the characteristics such as high speed and high frequency, the paper pays attention to the following questions:Neodymium Magnets The dimensions of the high speed induction machine with different rotor structures are calculated first. Then the mechanical strength characteristics of the high speed induction machine with four kinds of rotor structures are analyzed based on Ansys. The application situations in which different rotor structures are used are analyzed by the mechanical performances.
　　The critical speed of solid core rotor induction machine is calculated.The electromagnetic field of high speed induction machine is studied based on Ansoft. The electromagnetic performances of the high speed induction machine with the same stator dimension and different rotor structures are analyzed comparatively. The stator losses and rotor losses are calculated by FEM. The application situations in which different rotor structures are used are analyzed by the http://www.999magnet.com/products/110-sintered-neodymium-magnets electromagnetic performances.The iron loss calculation method of traditional machine is not fit to high speed machine. The loss coefficient in the high frequency is measured by the no-load experiment of the silicon sheet. So the stator core loss of the high speed induction machine is calculated more accurately.Because the high speed machine has small size and power density, the temperature rise is a critical problem that has to be solved. The temperature rise of the solid core rotor structure induction machine is calculated.

Design of the Brake System for a Electrically Driven Tracklayer

　　Design of the Brake System for a Electrically Driven Tracklayer
　　The transportation is the base of the national economy.With the development of society and economy,we need much better transportation system.The Maglev Vehicle must be the best way for the passenger transport in 21st century, because it is faster,safer and working better in protecting environment and saving energy.As the Shanghai business line went into working and the plan of the line between Shanghai and Hangzhou got passed,it is becoming an increasing demand to localize the maglev technology.After a simple introduction of the principle of the electronic tracklayer,this thesis focuses on expounding the design and realization of the brake system.At present neodymium prices the electronic vehicles are driven by rotary electromotor.Through the convey system,the power is transferred to the wheel.It tends to have some disadvantages such as the complicated convey system,the large power loss,the slow velocity and position response etc.But in linear motion field,the linear motor has overwhelming advantages.Based on the experimental maglev vehicle,the main content of this dissertation is as follows:1.Design of hydraulic pressure brake system;2.Design of electrical brake system;3.The analysis and design of eddy current system.After introducing the principle of permanent magnet eddy-current brake,the dissertation analyses the model using FEM software ANSYS and gets the distribution http://www.999magnet.com/products/142-neodymium-prices of magnetic field and the braking force,then optimizes the parameters to achieve the best braking performance.According to the design need for EV,electrical brake system,mechanical brake are joint Experiments were carried out to confirm the feasibility of such programs. Key words:Electronic Tracklayer;Linear Motor;Permanent magnet eddy-current brake,mechanical brake system;electrical brake system;Programmable Logic Controller(PLC)

Research and Design of a DSP-based on Servo Control System for Industrial Sewing Machine

　　Research and Design of a DSP-based on Servo Control System for Industrial Sewing Machine
　　Ac servo drives employing permanent magnet synchronous motors are being used for various purposes in consumer products and industry applications. Although their technical advantages are generally acknowledged, researchers are becoming aware of their cost and are exploring the possibility of cost reduction. Especially for industrial sewing machines, a servo control system with low cost but high performance is needed.A current sensorless space Cast Alnico Magnet voltage vector control algorithm is presented to the control of permanent magnet synchronous motors using simple low-resolution photoelectric encoder. This method directly control voltage vector and compensate the difference between voltage vector and current vector. The hardware and software are simplified without current sensors and cost is reduced. A cascaded control structure is presented for the sevo control system. PID controller is used to control the motor speed to improve interference immunity and obtain good tracking performance.TMS320F2407A digital signal processor (DSP) is selected as the CPU of the whole system and PM20CS060 intelligent power module (IPM) is selected for power drive. http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php Hardware design is precise and flexible. Circuits have strong ability of noise resistance. Some isolation and shield methods are used to improve performance of electro magnetic compatibility (EMC). Results of system test and plant probation show that the whole control system has good performance with lower cost and has bright market prospect.

The Study for Inertia Identification and Self-tuning of Controller Parameter of Numerical Control Machine Feeding System

　　The Study for Inertia Identification and Self-tuning of Controller Parameter of Numerical Control Machine Feeding System
　　Since numerical control machine has good performance in degree of automation, flexibility and high precision, it has been applied widely and further developed in modern manufacturing, especially, in complex part machining. The machining precision of numerical control machine is important performance index of numerical control machine, represents manufacture ability and developing level of manufacturing and is also one of most important symbol of all nation science and technology and industrialization level.
　　The precision numerical control machine mostly Block neodymium magnet depends on the precision of the servo feeding system. Permanent magnet synchronous motor (PMSM) has been widely used in high performance numerical control machine servo feeding system for its advantages, such as compactness, high efficiency, reliability and suitability to environment.The performance of PMSM servo feeding system is highly influenced by uncertainties of unpredictable variation of mechanical parameters and external load disturbances. In order to enhance the system static and dynamic performances. it is necessary to identify the mechanical parameters and auto-tune the speed controller.The thesis studies PMSM servo feeding system based on computer simulation. First, the mathematical model of PMSM and basic theory of vector control are introduced, the vector control scheme (i_d=0) based on rotor field orientation and current and speed double loops control scheme for PMSM servo system are made certain. Second, current controller and speed controller are designed respectively based on the method of engineering design and the method of part model matching. Then, the inertia of system is identified respectively based on model reference self adapting identification and recursive least http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php square method with oblivious gene. And the scheme for auto-tuning the speed controller based on the identified inertia is presented as well. The simulation results prove that the PMSM servo system has good dynamic and static performance when the inertia varies. The load torque is also difficult to be measured directly, so it needed to be online identified. This dissertation adopt a compensate control algorithm, which could dynamically compensate load torque variation. The simulation results show that, this compensatory control strategy can improve the anti-disturbance and enhance robustness of serve feeding system. A summery of whole thesis is given in the end.

Research and Development of a Digital Sensorless Control System Based on DSP

　　Research and Development of a Digital Sensorless Control System Based on DSP
　　In modern industrial field ,CNC machines have become the main part of the equipments. Generally speaking, The CNC machine is a mechanical motion equipment constituted by of X-Y stage and Z- axis device, meanwhile each axis is derived by a actuator such as direct current motor(DC motor) or alternating current motor(AC motor). Owing to its inherent Ball Neodymium Magnets properties such as high power density, low power factor, high efficiency and torque to inertia, Permanent magnetic synchronous motors(PMSMs) are widely used in various fields which need high control precision and perfect reliability characteristic, for example, aeronautic and astronautic field,CNC machine, following system of radar and various military weapon, robot etc.Speed sensor with high resolution such as encoder, velocity-measure motor is necessary in high performance loop-closed control system.The cost of the sensor is about one third of the total servo system, in addition the length is about one third of the motor, what’s worst, according to the statistical data from Fujimotor more than 60% of the faults occurred on the sensor. Obviously a speed/position sensor increases the cost and volume of the system, decreases the reliability and in some conditions it doesn’t work or can’t be installed.
　　The scheme that estimating the rotor position by measuring the phase voltage or current based on some advanced algorithms is receiving more and more attentions. In recent years sensorless control technique becomes one of the most active techniques for PMSM and will be the trend in the future.It is known that PMSM is a nonlinear, coupled and high-order system, the result is not satisfied using traditional linear control method. With the development of the digital signal processor non-linear control technique is gradually applied into PMSM. The sliding-mode variable structure theory is applied to the FOC for PMSM in the paper and as a result the the motor can be controlled without mechanical sensor.The main works and contributions include:(1) The full digital sensorless control scheme based on DSP is proposed after giving a serious research on the domestic and overseas actuality of the field,especially the key techniques,the speed estimation based on sliding-mode variable http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php structure and space vector Pulse-Width Modulation,are studied detailedly.(2) The mathematical model of the permanent magnet synchronous motor and the algorithms is set up based on the television and magnetics,the strategy is verified and improved during the simulation study.(3) The hardware and software are designed and implemented based on digital signal processor (DSP) TMS320F2812 for its excellent computational capability and rich peripheral resource.Finally some experiments are implemented under different conditions such as start-up, speed variety and torque variety. The results shows that the speed estimation follows the actual value commendably. The overshoot of the speed estimation is about 1.414%,the steady state error is about 4r/ min when the speed reference is 500r / min without load. The experience results verify the control algorithm under different conditions, and also demonstrate the proposed algorithm has not only good dynamic/steady-state performance but also perfect robustness and reliability.It can be seen that the structure of the control system is very simple; the cost is greatly reduced while the robustness is increased. The system can be applied on electrical driving system such as CNC machine, robot, packaging and printing fields.

Study on Brushless DC Motor Propeller and Control System of Doubly-revolved Underwater Robot

　　Study on Brushless DC Motor Propeller and Control System of Doubly-revolved Underwater Robot
　　At present, the motors used in the ocean robots are always the permanent magnet DC motor. Though, as the propeller, the permanent magnet DC motors have advantages such as good function of speed adjustment, however the conventional DC motor uses mechanic method to converse it. The structure of motor has the inherent limitation with brush and commutation and it makes that the motor has short life, poor reliability, difficult to maintain and high cost. In addition, Neodymium Magnets DC motors have some disadvantages such as large volume, heavy structure, low intensity of power and less capacity. So DC motor propellers haven’t more and more satisfied the requests of the motors used in the ocean robots. Besides brushless DC motor has the same advantage as conventional
　　DC motor, it has the following outstanding features, which has small volume, light structure, high intensity of power and large capacity. So, to use permanent magnetic brushless DC motor as the propeller of the ocean robot instead of the permanent magnet DC motor has a great significance both in theory and in practice.This thesis describes a control system of the brushless DC motor, which adopts a 32 bit TMS320F2812 DSP of TI company as the digital motor control. According to the demand of the system structure and control regulation of brushless DC http://www.999magnet.com/products/110-sintered-neodymium-magnets motor , a permanent magnetic brushless DC motor of double-revolve ocean robot was designed. And for a brushless DC motor of the 92BL series, which is used for the experimentation, a control system’s blue print was put forward. Then, the hardware and software design of the system according to the preceding solutions are discussed in detailed. The thesis also introduced the control circuit of DSP TMS320F2812, the drive circuit of motor and the sampling circuit of position and current, and software programming as well. At last the testing phenomenon when the control system running is observed and the experimental results are analyzed.Because of the using of DSP technique, the system of the brushless DC motor used on the ocean robot not only makes the system acquire the high accuracy, high dependability, but also simplifies the system structure, and increases the system function. It has extensively applied value to the research of the control system.

Study of Servo Turret Control System Base on DSP

　　Study of Servo Turret Control System Base on DSP
　　The numerical control turret is the important component and key function part of the CNC tool machine. At present, the numerical control turret, according to the related occasion of the host machine can be divided into three grades as high, middle and low, among them, middle-and-low-grade numerical control turret adopt mechanical structure for the first indexing and ordinary torque motor as power, however, its structure is complicated, dependability is not high. Top-grade servo turret adopts the servo motor to make power and reaches a close-ring position control , then, the machinery structure is not adopted for the first indexing. So, its simple structure and high dependability are adopted widely to the top-grade CNC tool machine. And the key technology of the servo turret is the position control technology.With the development of modern electric and electronic technology, control technology Alnico Magnets and computer technology, the application technology of motor gets its further development too.Its use has already left simple offering power and park-upping for accurate controlling of speed , position , torque ,etc, therefore, it satisfies the ideal requirement of its driving mechanical movement, and realizes accurate mechanical movement control , position control and these synthesis.
　　This thesis rises from the high speed, the high performance servo turret development project of the SMTCL.The mechanism design is completed by Solidworks.It has completed the design of servo turret control system hardware and the software as well as the development of the servo tool rest real-time monitoring software -servo turret control system.Permanent magnetism synchronous motor exchange servo system combines control technology with permanent magnetism synchronous motor, modern electric and electronic technology to form new-type interchange http://www.999magnet.com/products/108-alnico-magnets servo system, and because of its good operation performance, it becomes one of the focus study in contemporary electric transmission field.Base on digital signal processor (DSP) TMS320LF2407A ,this thesis has studied and designed its controller system by the research object of permanent magnetism synchronousmachine.The thesis has analyzed permanent magnetism synchronous motor mathematical model and studied permanent magnetism synchronous motor vector control method and the spatial vector pulse wide principle (SVPWM) ,discussedthe position ring, the speed ring and the current ring control method, designed the model reference fuzzy auto-adapted positioner, the PI speed controller and the PI current controller and set up permanent magnetism synchronous motor exchange servo control system, then, all are applied to the servo turret control.Analyzing from the simulation and the test result, using the vector control, the PI control, the fuzzy control which base on the DSP chip are feasible, therefore, this thesis has a great practical significance in impelling our upscale numerical control turret.

Study and Development of Digital PMSM Servo Driver

　　Study and Development of Digital PMSM Servo Driver
　　PMSM (Permanent Magnet Synchronous Motor) is widely applied for its excellent performance into fields such as Robot, Digital Control etc. And with the development of electrical and electronic techniques, DSP (digital signal process) bring about the possibility of implements of some successful algorithms. In this requirement and technique background, the author does the Block neodymium magnet comprehensive studies and developments of digital PMSM servo driver.First of all, the hardware implements of digital PMSM servo driver are given, which include power board, control board, and the A/D and D/A logic. In this part the development idea plays a very important and directory role. And next is the vector control model which involves current model and speed model. The analysis and simulation of these models give the basis to implements of next part. And following is the implement of PI algorithm. Finally the author proposes a PMSM servo control method of speed based on http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php adaptive fuzzy control theory, with high performance. The results of simulation verify the effect of this methodology.In general, some key techniques related with PMSM servo driver are broken through, which put a very good foundation for next work.

Electromechanical Coupling Analysis of PMSM and Precision Transmission System

　　Electromechanical Coupling Analysis of PMSM and Precision Transmission System
　　Micro-special motors have been widely applied in various fields of national economy along with the rapid development of micro-electronics, computer and control technology; at the same time, the transmission accuracy of precision driving system has been improving Ball Neodymium Magnets constantly due to the appearance of various new design methods and processing technology, and it is still a key link in complex electromechanical system. As can be seen that micro-special motors and precision driving system have improved greatly under separate circumstance, so the research of coupling relationship between micro-special motors and precision driving system has important practical significance. The following works have been done:1. When the coupling models of complex electromechanical system were discussed, the fundamental way of electromechanical coupling can be summarized as following:
　　First was to build the coupling model on the basis of extracting the coupling factors, then to decouple and resolve. Second was to discuss the basic ways of building the coupling model, including the fundamental element equation and loop equation of electromechanical system. And at last, two ways of resolving the coupling models were analyzed: transfer function and state space method.2. This paper mainly analyzed the electromechanical coupling factors between micro-special motors(e.g.PMSM) and precision driving system(e.g.precusion reducer) in terms of electromechanical http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php coupling. Firstly, the establishing process of the experimental table on electromechanical coupling was demonstrated according to the modern electromechanical design method, which mainly including the determination of sampling frequency, the choice of displacement sensors, the characteristics analysis and choice of PMSM and precision reducer, the hardware structure of data acquisition system, the processing method of data, the program development for the experimental table.3. The simplified models and their transfer function were achieved according to the previous modeling and solving methods of the electromechanical system. Then the mathematical model of PMSM in three-phase coordinate was derived according to the lagrange-maxwell equation.4. Decouple the equation of PMSM through coordinate conversion according to the models built previously. Then the control block was acquired on the basis of the decoupled models.The PMSM and transmission system were simulated in Matlab/Simulink according to their models mentioned above, and certain conclusions were achieved.

Evaluation of Economic Benefit Rare Earth PM Synchro Linear Motor Project

　　Evaluation of Economic Benefit Rare Earth PM Synchro Linear Motor Project
　　In the market economy system , as the principal part of market economy , corporations should not only catch the opportunity of investment and pursue the high profit, but also elusion or reduce the risk of investment , in order to make corporations develop unceasingly. So it is the guarantee of corporations investing project and advancing benefit that analyze neodymium standard state economy benefit.This thesis , from the point of investor view, using the theory of project managment and economy benefit analytics , analyzes and studies the Rare Earth PM Synchro Linear motor Project of Harbin Tech.Full Industry Co. Ltd . The thesis analyzes the project’s economy environment , constructer , manufacture means , finance, investment. The thesis uses the theory of profit and loss balance and economy sensitivity analytical method to quantitative analysze the risk of the Rare Earth PM Synchro Linear motor Project , and put forward the resolve measure.The thesis found the Rare Earth http://www.999magnet.com/products/112-neodymium-standard-state PM Synchro Linear motor Project economic benefit evaluation index system and the fuzzy multiple comprehensive assessment of economic benefit. and the paper use the theory to assesse the Rare Earth PM Synchro Linear motor Project. From the point of view of qualitative analysis and quantitative analysis , the investing decision-making of the project is scientific and exercisable.