Research on Magnetic Technics as a Mean Used in Paraffin Control in Curde Oil Field

　　Research on Magnetic Technics as a Mean Used in Paraffin Control in Curde Oil Field
　　The crude oil produced by Ta-ching oil-field earth, which lies in the cold region in the northeast of our country, belongs to the paraffinic oil. For many years the crystallization and deposition of n-paraffin has hampered the harvesting, transportation and processing of crude oil. So people in this oil-field have to heat the oil to insure it to magnetic materials
http://www.999magnet.com be fluid. For every year, the cost of heating takes one third of the production value.By directing crude oil through a strong, permanent magnetic field, the growth pattern of paraffin and scale crystals is altered. This is propitious to reduce the temperature degree of heating, and retrench money. As a rule, for different crude oil with different component, the intensity of magnetic field which can get the best purpose is different. But the intensity of magnetic field in paraffin control systems in existence is always permanent. So when the component of the crude oil changed, the paraffin control system will be in invalidation.In this paper, the focus will be on the problem which has been stated previously. A novel paraffin http://www.999magnet.com  control system with alterable intensity of magnetic field was designed to resolve the problem. The primary work is list below: Summarize and analyze the characteristic of waxy crude oil and the micro- theories of magnetic effect. Choose one of the theories as the basis of the design paraffin control system.Summarize the key factors which affect the magnetic purpose. Designed a novel electromagnetic paraffin control system with alterable magnetic field. The invalidation problem of custom systems will be solved.A novel project was designed for simultaneous monitoring of tow identical flowing fluids, identical except for expose of one of them to magnetic fields. The purpose of the project is for the choice of magnetic parameter

Research on the Dual PWM Converter Based on the Power Output of Microturbine

　　Research on the Dual PWM Converter Based on the Power Output of Microturbine
　　This paper studies the power conversion of the power output of the combined cooling heating and power (CCHP) system based on microturbine. Considering the characteristic of this system, this paper proposes the dual PWM converter system will be applied to the system above. This dual PWM converter system can rectify the high-frequence AC generated by permament magnetic generator drived by the microturbine to stable high-quality DC ,then the DC will be directly transformed to three-phase AC for loads or grid-connected generation.
　　Firstly, this paper systematicly expounds the basic principles, mathematics model, calculation of the main circuit parameters of three-phase voltage source neodymium standard state PWM rectifier (for short 3-phase VSR) and the design of the control system, and then establishes the simulation model of the 3-phase VSR system and 3-phase PWM inverter, and also that of dual PWM converter system. The results of those simulations are illastrated and analyzed, and prove that the dual PWM converter system satisfies the expected request.Fist of all, this paper studies 3-phase VSR, and puts forward the SVPWM control algorithm’s voltage oriented control strategy will be applied to the system, and analyses and calculates the SVPWM algorithm thoroughly.Then, combined 3-phase VSR and 3-phase PWM inverter, the dual PWM converter system is brought up. At last, this paper respectively reserchs the simulations of 3-phase VSR system, 3-phase PWM inverter system and the dual PWM converter system using MATLAB 7.0.Considering the request of the CCHP system for power transformation, this paper brings up the current feed-forward and double loop-closed decoupling http://www.999magnet.com/products/112-neodymium-standard-state control frame and the space vector pulse width modulation algorithm which is easily digital realized, reduces the harmonic currents of the rectifier AC side, minimizes the ripple DC voltage and improves the performance of dynamic response. The simulation models of SVPWM algorithm, 3-phase VSR system, 3-phase PWM inverter system and the dual PWM converter system are established using Matlab7.0/Simulink6.0. Through the further research of rectification simulatin model, a series simulation datas are obtained for studying the relationship between the circuit parameters, controls parameters and the system performance. The simulation result indicates that the dual PWM converter has a favorable steady state and dynamic response, validates the correctness of theoretical analysis, satisfies the expected request, and provides a good foundation for the practical engineering application.

Research of Brushless DC Motors Control System by ARM Technology

　　Research of Brushless DC Motors Control System by ARM Technology
　　These years along with the development of power-electronics technique and micro-control technique, permanent magnetic brushless DC motor is characterized by small volume, light weight, high efficiency, low noises, big stand-alone capability and reliability appeared and matured. So it is widely used in many field of national economy, especially in ship electric propulsion.neodymium prices The paper first introduces the basic component parts, the basic running principle, the running characteristic and the transfer function of the BLDC motor, analyses the course of changing phase and distributing of PWM signal. Followed, it introduces the development and application of ARM technique, and the characteristic of chip LPC2210. Based on these facts, it presents the sensor solution for BLDC motor, designs the hardware system and software system. In the design of hardware, it designs the control system with ARM chip - LPC2210 as the center, and detector circuit, protection circuit, based on the research in brushless DC motor. The design makes full use of the hardware resources of chip LPC2210 for high reliability and simplified the construction of system. In order to read and maintain easy, a http://www.999magnet.com/products/142-neodymium-prices microprogramming modular is adopted in system software design. A new control strategy of voltage and current PWM is realized for improving motor’s working efficiency. System software modules associating the hardware circuit make system more perfect performance of protection and control.In the end, the paper discusses the system debugging and some problem occurred during it. Then we observe parameters of actual system using digital oscillograph and give a conclusion. In fact, the control system work well as it was expected.

The Research of Control System for Brushless DC Motor Using DSP Technology

　　The Research of Control System for Brushless DC Motor Using DSP Technology
　　Brushless DC motor is a new motor and the integration of power semiconductors and permanent magnet materials. It has the excellent speed control performance of DC motors, and many such advantages of AC motors as simple structure, easily controlled, high reliability, high efficiency, and easy maintenance. At present, in the field of industrial control, it has been widely used.Neodymium Magnets This paper introduces the brushless DC motor control system design based on DSP and the design process.First, the paper analyzes the basic configuration and the fundamental principle of the brushless DC motor control system, and then a brushless DC motor mathematical model is built.
　　The commutation process and the distribution of the PWM signal of a brushless DC motor are analyzed.Secondly, the fuzzy self-tuning PID controller is designed, according to the characteristics of the system, and the simulation model of the brushless DC motors is established, based on the fuzzy self-tuning PID controller. Simulation studies of the starting process, operation process, switch-in and switch-out of load, are carried out. Curves of Rotation speed, torque, current and back-EMF, are got in accordance with Fuzzy self-tuning PID control and PID control, respectively, and these curves are compared to make analyses. Meanwhile, curves of rotation speed, which are got with fuzzy self-tuning PID and normal PID, respectively, are analyzed. The results of simulation http://www.999magnet.com/products/110-sintered-neodymium-magnets prove the feasibility of the control system.Finally, the software and hardware design of the system are presented. As for the part of hardware design, first an overall design of the whole system is presented, and then several main circuit designs such as DSP interface circuit, drive circuit, three-phase inverter circuit, logic control circuits and circuit protection are given. Electromagnetic interference (EMI) of the circuit, and solutions to the problem of electromagnetic interference, are also discussed. As for the part of software design, the overall design and the main flow chart are given as well. Then several problems of the software implementation such as activated module, interrupt module, position detection module, the module for phase control, the speed control module current regulator module are discussed in detail. At last, the reliability of the software is designed.

The Study and Design of Numerical Control System Based on DSP

　　The Study and Design of Numerical Control System Based on DSP
　　Numerical control machine is an automatic machining tool with high flexibility and efficiency. Along with the development of production and technology, the use of numerical control machine is becoming more widespread. Numerical control systems are the critical parts of numerical control machines. The quality and efficiency mainly depend upon the functions and performance of numerical control systems. A good numerical control system is essential to the price and the magnetic materials market of the machine.This paper introduces a numerical control system controlled digitally by DSP controllers.Today’s high-performance, low-cost digital signal processor controllers, such as the Texas Instruments’ TMS320LF2407A, provide an improved and low-cost solution for numerical control system.Firstly it makes a brief introduction of the history of numerical control technology, the characteristic of numerical control technology, the object of the study and its developing tendence.Then introduce the composition of the system, interpolation theory, the application of DSP on motor control, the vector control theory of pernmanent magnet synchrouous motor and DSP control theory of direct-current brushless motor.Thirdly the structure design of numerical control system, http://www.999magnet.com hardware design of numerical system, including: the servo motor and its driver’s choice, up and down CPU’s choice, the interfaces, the powers, the clocks, the reset circuits; DSP preliminary software design and base children programs design.In the end of this paper, the conclusion of the study on DSP-based numerical control system is given, the prospect of numerical control system and some advices for further study is persented.The paper comes from actuality, being a typical mechanical and electrical thesis, it had some theory meanings and actual value, it is a good reference for the people who work on numerical control system.

Application of neodymium magnets in AC servo motor

　　Application of neodymium magnets in AC servo motor
　　Servo motor rotor is neodymium magnets, drive control of the U/V/W three-phase power to form the electromagnetic field, the rotor rotates in the magnetic magnetic materials field, at the same time, motor with encoder feedback signal to the drive, the drive according to the feedback value is compared to a target value, adjusting the angle of http://www.999magnet.com rotation of a rotor.

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 neodymium standard state 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 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 http://www.999magnet.com/products/112-neodymium-standard-state 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 prices 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 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 http://www.999magnet.com/products/142-neodymium-prices 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 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 Neodymium Magnets 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 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 http://www.999magnet.com/products/110-sintered-neodymium-magnets 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 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 magnetic materials 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. 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 http://www.999magnet.com 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.

Research on Hydrogenation Reaction and Microstructure of ZK60 Magnesium Alloy by Reactive Ball Milling under Hydrogen

　　Research on Hydrogenation Reaction and Microstructure of ZK60 Magnesium Alloy by Reactive Ball Milling under Hydrogen
　　Magnesium alloy is a light structure material with the lowest density in all the current metals. Due to its high specific strength, high specific stiffness, good damping capacity and good shielding properties, magnesium alloys have been widely used in the fields of aviation and aerospace industry, automobile industry, electronics industry, communication industry, and other important fields. ZK60(Mg-Zn-Zr) is one of the best magnesium alloys with high strength. However, because magnesium alloys have HCP crystalline structure which leads to low symmetry, few slip systems and bad plastic deformation processability, it is limited to be widely used. As we all know, one of significant ways treating this alloy to improve its processability and plasticity is grain refinement. At present, there are several ways refining magnesium alloy grain, such as incubation treatment during casting, Neodymium Magnets semi-solid state deformation, die casting, severe plastic deformation, and so on. All of these treatment ways approximately can only reduce the grain to 0.5~1μm, and it is hard to reach nanometer size.HDDR(hydrogenation-disproportionation-desorption-recombination) is a new hydrogen treatment technics to prepare ultra-fine rare earth permanent magnetic powder material. Magnesium can react with hydrogen to get the product of magnesium hydride, and also this reaction is reversible, so, as a result, HDDR technics can be introduced to process magnesium alloys and to refine grains. Conventionally the reaction to get magnesium hydride needs high temperature and high hydrogen pressure, which are a little difficult to satisfy with.
　　While high energy ball milling can provide the reactant system with mechanical energy, substituting the thermal energy, which can also make the reaction http://www.999magnet.com/products/110-sintered-neodymium-magnets happen, so we combine the hydrogenation with mechanical milling to produce nanostructured magnesium hydride at room temperature.In this paper, the hydrogenation mechanism of ZK60 magnesium alloy and the structure evolution has been studied. The effects on kinetics of ZK60 hydrogenated by hydrogen pressure, the ratio of ball to material and the rotation speed have also been researched. Through XRD, SEM and TEM, we analyzed the discipline of structure evolution during the hydrogenation process. In this study, ZK60 magnesium alloy powder milled for 20 hours can be hydrogenated fully at room temperature when the ratio of ball to material is 60:1 and the rotation speed is 375r/min under 0.5MPa hydrogen pressure. By comparative experiments, the reaction rate can be accelerated when the experiment is carried out under a higher hydrogen pressure, a higher ratio of ball to material and a higher rotation speed. After ZK60 powder hydrogenated fully, magnesium hydride was prepared with 10nm~20nm grain size.

The Development of Winding Servo System for Spinning Machine

　　The Development of Winding Servo System for Spinning Machine
　　The spinning machine is the most important production equipment of textile industry, feeding the roving one-way to produce yarn for weaving and knitting by drafting and twisting. Yarn is draught by lifting board, winds to spindle of high-speed rotation to form specific formation.The winding formation in ring spinning machine is controlled by mechanical cam at rubber magnetic sheet present in China, resulting in low quality, high mechanical wear and narrow application. The paper utilizes the new-developed winding servo system to drive the lifting board, and substitutes the induction motor and the mechanical cam. The system consists of touch screen, programmable logic controller (PLC), servo driver, permanent magnet synchronous motor and sensors etc. Touch-screen finishes the function of parameters inputting, data showing, process monitoring. DSP in the servo driver communicates with PLC, acquires various signals of the system sensors, outputs control signals to inverters, servo driver, and other implementing agencies. The servo driver drives motor to drive the lifting board after gear slows the speed. In addition to the implementation of field-orientated control and winding formation, DSP in the servo driver is responsible for communication with PLC by means of SCI.The paper introduces the principle of the http://www.chinamagnets.biz/rubber/rubber-magnetic-sheet.php spinning machine, concludes the winding algorithm by calculate the process of mechanical winding and formation, describes the constitution and function of the winding servo system. Then designs the servo system with the core of DSP in which winding algorithm and the FOC are combined, reduces the real-time requirements of the PLC. The system is used on the improved mechanical spinning frame, and the satisfied winding formation and unreeling are obtained, and the test results are given. The worksite operation demonstrates the software and hardware schemes are feasible and general.

A Study on Motor Control and Magnetic Levitation Control for Flywheel Battery

　　A Study on Motor Control and Magnetic Levitation Control for Flywheel Battery
　　Fly wheel energy storage system (FESS) is a new and efficient battery, which is innocent to the environment. The drive motor control and magnetic levitation control are two key techniques to improve the performance of the FESS. The dissertation design the permanent brushless DC motors control system and single-axisdegree-of-freedom bearing control system based on DSP.A double closed-loop scheme (current loop and speed loop) is adopted in thepermanent brushless DC motors control system. The system hardware includes the three-phase inverter, the Block Ceramic Magnets driving circuit, the protection circuit, the position detecting circuit, the current detecting circuit and the periphery circuit of DSP. The system software has been designed to realize the control strategy, which includes the main, A/D sampling, current regulation, speed calculation, speed regulation and capture interruption subroutine. By comparing experimental results from the DSP-based control system and the analog circuit control system, it can be concluded that the control system based on DSP has the advantages of high reliability, low noise, easily upgrading and realizing advanced control strategies.Single-axis degree-of-freedom bearing control system use a new type of hybrid magnetic bearing made up of electromagnet and permanent magnet. The system hardware and software has been designed to http://www.chinamagnets.biz/Ceramic/Block-Ceramic-Magnets.php realize a stable levitation. The experiment results show that compared with the traditional electromagnetic bearing, hybrid magnetic bearing has the advantages of simple structure, small control power, low cost of controller, easy to achieve and so on.

旋转式自发电贮能技术探索性研究

　　旋转式自发电贮能技术探索性研究
　　With the development of intelligent and smart munitions, the demand of anti-highoverloading, transient high power, ten-year’s storage or longer and miniaturization poweron munitions is extremely urgent. The physics power not only has nondestructive testingand reusable characters but also has advantage in long storage and using of high and lowtemperature. And because of the use of the high quality permanent magnetic materials, more and more military experts in the world pay attention to the micro physics power onmunitions.Based on the flight characteristic Block neodymium magnet of projectile-and the-relative-rotation principle ofparts of projectile, a kind of completely sealed rotary power plant is-suggested. This plantmakes use of rotary environmental force to generate electricity. The permanent magnetic isserved as magnetic potential source in this plant. The rolling bearings are placed betweenstator and rotor, so the stator and rotor can relatively rotary. Without other auxiliary powers, this plant is able to generate electricity by making use of rotation of projectile. The voltagegenerated by this plant supplies energy for the load via commutating, filtering andvoltage-stabilizing.Considering the structure of the power plant, based on the equivalent magnetic circuitprinciple, mathematical model is build to analyze the magnetic circuit of this plant. Thentheoretical calculation and ANSYS finite element analysis are compared. In the part ofANSYS finite element analysis, command mode simulation http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php computation is made by usingthe APDL of ANSYS. Thus, it makes easy to modify structural parameter and improvescomputing speed. And in the part of the analysis of result, many simulation results areproposed with different structural parameters. Comparison and analyse are made in termsof simulation results, some rules of the influence of main structural parameter on magneticflux in tooth areput forward.The rotary power plant is suggested in this paper provides a new means for power onmunitions. This plant has many characters such as self-generating electric, miniaturizing, long-term storage. Thus it is able to match the power on munitions demand.

Chaos Ant Colony Algorithm and Its Application to Design the Deepwater Motor

　　Chaos Ant Colony Algorithm and Its Application to Design the Deepwater Motor
　　A new hybrid optimum algorithm is presented in this paper, that is chaos ant colony algorithm(CACA). By using the method, good results are obtained in optimizing the deepwater thruster motor. The optimization is an application technology based on mathematics to solve different engineering optimization problems. However, more and more people pay attention Ball Neodymium Magnets to a great parallel intelligent algorithm that is needed by the practical engineering problems with complicated, constrained, multi-minimum characters. It’s necessary to develop a fast effective optimum algorithm to solve motor design problem, which is a multivariable, nonlinear and complex optimum problem.In order to obtain a feasible optimum algorithm, four algorithms’ theories, searching steps and features are discussed in the paper. These algorithms are Genetic Algorithm(GA), Simulated Annealing(SA), Chaos Algorithm(CA) and Ant Colony Algorithm(ACA). The advantages and disadvantages are pointed out through optimizing the test functions.Then the characters of chaos and ant colony algorithm are especially discussed. Because the slow convergence speed constrains the ACA’s application to many problems, a series of improvement to the basic ACA is presented in this paper. The improved ACA is used to optimize the test functions and the magnetic pole dimensions of permanent magnet synchronous motor (PMSM). Some effect is obtained in improving convergence speed.Because of the limitation of the improved ACA, Logistic mapping and Ulam-von Neumann mapping are analyzed systematically in this paper. The intrinsic stochastic property, ergodicity, regularity and sensitivity to initial http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php values are shown in this paper. Then a hybrid algorithm of chaos and ant colony is presented, that is chaotic ant colony algorithm. The optimum solution of test function shows that the hybrid algorithm has advantages of high precision, fast convergence and stabilization. The feasibility and utility are confirmed by the optimum example of PMSM. Under the condition of unchanged working performance, the volume and efficiency are decreased and improved respectively. After establishing objective function and constrained conditions of deepwater brushless DC motor (BLDCM), the main dimension, efficiency and volume of deepwater BLDCM are optimized by using the hybrid algorithm. The no-load magnetic field is analyzed by the finite element analysis software. The result of Fourier decomposition for air-gap flux density proves the validity of the optimization.

Research on Rigidity Control of Large-scale Machine Tool Maglev Platform

　　Research on Rigidity Control of Large-scale Machine Tool Maglev Platform
　　This thesis is based on Liaoning province education department project "Research on maglev linear motor and its control strategy for machine tool feeding system", advising the practical characteristics of large-scale machine tool, that the working platform of large-scale machine tool requires more strictly on suspension rigidity than the maglev train. This thesis did research on control algorithms to improve the maglev rigidity.As hybrid magnets combined permanent material and electrical magnet can solve the problem that the traditional electrical magnetic suspension system consumes much power, This thesis mainly did research on hybrid magnets.At the first, in Neodymium Magnets order to resolve the rigidity effect caused by the current changes of electromagnet coils, double loop control system was adopted. Then the thesis introduces some common controllers, and choose PI controller after comparing them. The current inner loop not only improves the dynamic characteristics, but also offset 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 was proposed. The composted control model based on the conventional PED 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.At last, the thesis simulates the above three control systems, http://www.999magnet.com/products/110-sintered-neodymium-magnets and analyzes the feasibility according to practical application. The simulation results prove 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.

Study on the Constant Current Biased Magnetic Bearing

　　Study on the Constant Current Biased Magnetic Bearing
　　This paper study the constant current biased magnetic bearing,whose components of electric system and mechanical system,advantages and disadvantages are introduced in this paper.Compared with the Permanent Magnet Biased Magnetic Bearing,It can reduce the power consumption,and its structure is more simple than the conventional active magnetic bearing.According to the constant current biased magnetic bearing,this paper proposed two kinds of coil-wrapping,it is very important to estimate the distribution of magnetic flux.In this paper,as different wrapping Block Ceramic Magnets of coil are concerned,two methods of detecting the air gap flux density are analytic in detail.The simulation results verify that each magnet has two coils on it whose magnetic modality is perfect.As to two degree of freedom of the constant current biased magnetic bearing,large numbers of experiment results are put up.They show it which can suspense stably due to the rotor disturb,whose rotor can be at the center position with variable connection of the control coil such as in series or parallel connection,whose vibration is different from the conventional active magnetic bearing with the same load capacity.At last,this paper compare the three kinds of power consumption with each other.Finally,it points out that the power consumption of the constant current biased magnetic bearing is less than the conventional http://www.chinamagnets.biz/Ceramic/Block-Ceramic-Magnets.php active magnetic bearing,it can reduce the cost and improve efficiency.The paper laid foundations for the further study of the five degree of freedom of the constant current biased magnetic bearing .

Study of the Control System of Linear Motor Pumping Based on DSP and ARM

　　Study of the Control System of Linear Motor Pumping Based on DSP and ARM
　　Traditional beam-pumping unit must transform Rotational motion to linear motion through the intermediate.However, linear motor pumping unit can directly drive rod producting oil by using the linear motion of motor.It save energy significantly and greatly reduce maintenance costs.High-power and low-speed permanent magnet synchronous linear motors (AC PMLSM) possess many characteristics,such as strongly nonlinear, time-varying parameters and strong electromagnetic coupling.At present, there is no suitable intelligent control system for control of this new direct-drive system.Based on the AC PMLSM servo drive systems and optimizing pumping Block neodymium magnet control system,analyse and research hardware architecture of the intelligent control system of extended linear motor pumping.
　　The design and implementation of DSP+FPGA-based PMLSM AC servo control system have completed.Besides this, also complete the design of optimization of pumping control system. This paper includes the following aspects:Firstly, after the detailed analysis towarad AC PMLSM servo control system, linear motor pumping unit’s work principle and optimization of pumping control system, completed a scalable intelligent control system of linear motor pumping unit.Secondly, base on the research of linear motor servo control technology and compare to several system that have been used in many projects,the design and implementation of DSP+FPGA-based structure of the all-digital linear synchronous motor servo control system hardware have accomplished.System use TMS320F2812 DSP as control kernel,and FPGA provides flexibility for the expansion of the http://www.chinamagnets.biz/Neodymium/Block-neodymium-magnet.php external interface.The novel system is flexible, applicable to different situations,applicable to blocking design,and also has a short development period and is prone to keep up and upgrade.Thirdly, base on the research of the optimization of pumping control systems and analysis the functional requirements and method of the remote control, indicator diagram and pumping full test.The design of the pumping unit based on ARM embedded control optimized pumping systems have finished.In this paper, the work of the linear motor pumping unit intelligent control system will provide a powerful scalable hardware platform. It also lays the foundation. of realization of complex linear motor servo control strategy,optimization of pumping control system and engineering.

Methods Research of Weakening Cogging Torque in Flux Reversal Machine

　　Methods Research of Weakening Cogging Torque in Flux Reversal Machine
　　Flux reveral machine (FRM) is a novel doubly salient permanent-magnet machine (DSPM). It was brought faward by R.P.Deodhar and others. And they carried on the research of preliminary theory and experiment. Thereafter, some scholars studied structural design and electromagnetic field of FRM. At present, the research of FRM is still in the initial stage and only stays in the step of preliminary theory research and protype experiment. There Ball Neodymium Magnets are still many deficiencies in the structure and the performance. The basic structure and working principle of FRM is discussed in this paper. It’s mathematic model is deduced. The methods of optimum designing magnetic structure in FRM, which based on fully considering of the magnetic field characters, are proposed in this paper. The methods weaken cogging torque in FRM effectively and make it operate steadily on the premise of guarantee its own merits.Finite element method (FEM) is used to solve the electromagnetic field of FRM. The electromagnetic field distribution and operational feature of FRM can be analysed through the computed results. To obtain ideal model, the electromagnetic fields of different stator and rotor structures are analysed. The three-phase 6/8 polar FRM structure is acquired finally. The permenant-magnet is NdFeB and its remnant magnetism and coercive force are both high. The width poles and corresponding narraw poles of the stator is paired in the space. The rotor laminated core is divided into three sections along axial direction. This new structure, which is based on the the premise of maximizing its specific power, can weaken cogging torque effectively and output optimal running performance. http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php    Corresponding control strategy suit to this new class of machine, which combines the control theory of brushless direct current motor and switch reluctance motor, is concluded. The method is variable angle and voltage pulse-width modulation (PWM) control combination. And the hardware control system is briefly designed, which takes DSP chip TMS320LF2407A as the core device.