Research on Key Technologies of Servo Control System of Permanent Magnet Synchronous Linear Motor and Its Realization
In many industrial controlling fields, the object movement path is often the form of linear.The linear motor can be access to linear motion directly, eliminating the middle part of the transformation, providing linear motion of the thrust and getting one-way or two-way controllable limited displacement, besides,which have some characteristics.such as long trip, low inertia, high-precision ,Fast response andhigh-speed.This dissertation presents the project about the permanent magnet synchronous linear motor (PMSLM) controlling system of absolute Encoder,which has the independent property right after giving in-depth discussion on the development and application history of the linear motor abroad and domestic.The structure of linear motor can be acquired from the general rotated neodymium prices motor,which is spread along the axes.It is same that variational winding current generates the gap magnetic field for the PMSLM and synchronous rotated motor according to the principle.The difference between the two is the gap magnetic field of PMSLM is a straight line along the direction of translation,but the rotating motor can be done by rotation magnetic field.
The gap magnetic field makes the permanent magnet to generate drive force.which has a lot of effect on the thrust volatility characteristics of PMSLM because of these inhere factor of characteristics,such as flux density non-sine wave, alveolar effects, side effects,and so on.so we need pay attention to these factors and improve PMSLM movement characteristics as designing servo control system.First of all,this paper analysis history of the linear motor abroad and domestic,structure, working principle and Using the method of FEM to analysis three-phase motor winding electromagnetic force,the end effect and alveolar of PMSLM,and give some measures of improvement and optimization motor structure that eliminate and inhibit the impact of servo control system stability for http://www.999magnet.com/products/142-neodymium-prices harmonic thrust,which also provide on-line basis compensation to servo control system. Secondly, build the mathematical model of PMSLM based on PMSLM and characteristics analysis,and have a study about PMSLM strategy.About developing of servo control system,which has detail on it from two aspects in this paper, In term of hardware,select digital signal processor(DSP) that have strong computing capacity,more performance,higher integration and faster A/D converter speed and field programmable gate array(FPGA) that have low power,high-performance,low cost and high-reliability to construct the core components of servo controller,And in term of software,using CCS2.0 and Quartus II to write program with language C and VHDL,which gives program flow chart of main program and subprogram in this paper.Finally,using MATLAB/Simulink to build simulink model of servo controller and presented the result of simulation.Finally,through debug this servosystem and experiment on it,got the result of tests.and then to exsiting problems and gives the future improvement proposals.
2012年10月31日星期三
The Design and Calculation of the Pumping Unit Driven by the Permanent Magnet Linear Motor
The Design and Calculation of the Pumping Unit Driven by the Permanent Magnet Linear Motor
The beam pumping units in oil field have the advantages of simple structure and high reliability at the present time. But they have the problem of high energy consumption and low efficiency. So in the past half century , in recent years in particular, along with the develop of science and technology, the operator in oil field explore the new oil recovery equipment constantly.Facing the practical problems of the beam pumping unit, this paper put forward a plan of the design of pumping unit driven by a permanent magnet linear motor. This pumping unit driven by a permanent magnet linear Neodymium Magnets motor, the straight reciprocating motion of electric machinery’s kinetosome can switch to the upward and downward reciprocating of donkey head’s suspension center through a crown block and flexible. The kinetosome can achieve a low and wide ranged motion velocity easily. So we can cancel the link mechanism and reduction box of original beam pumping unit. It can greatly simplify the monolithic construction of pumping unit, it can rise the ground efficiency of pumping unit, the reliability of machine’s transmission devices and operating efficiency of pumping unit greatly.This paper introduce the basic structure and operating principle of the permanent magnet linear motor, and analyze its http://www.999magnet.com/products/110-sintered-neodymium-magnets magnetic field pattern detailedly. It also analyze the control policy of electric machinery , and use direct force control for the permanent magnet linear motor on the basis of the results. This paper also study the basic structure and domination principle of the direct force control, design the basic structure of the pumping unit driven by permanent magnet linear motor, analyse the polished rod load and equilibrium principle. Analyse the rod pumping system’s prediction model bring forward by S.G. Gibbs and analyze the sucker rod’s running status through the computer, and design the concrete parameter of the permanent magnet linear motor as a result. And design the concrete structure of pumping unit system. Figure out the high energy consumption and low efficiency problem of beam pumping unit.it has a big development potential.
The beam pumping units in oil field have the advantages of simple structure and high reliability at the present time. But they have the problem of high energy consumption and low efficiency. So in the past half century , in recent years in particular, along with the develop of science and technology, the operator in oil field explore the new oil recovery equipment constantly.Facing the practical problems of the beam pumping unit, this paper put forward a plan of the design of pumping unit driven by a permanent magnet linear motor. This pumping unit driven by a permanent magnet linear Neodymium Magnets motor, the straight reciprocating motion of electric machinery’s kinetosome can switch to the upward and downward reciprocating of donkey head’s suspension center through a crown block and flexible. The kinetosome can achieve a low and wide ranged motion velocity easily. So we can cancel the link mechanism and reduction box of original beam pumping unit. It can greatly simplify the monolithic construction of pumping unit, it can rise the ground efficiency of pumping unit, the reliability of machine’s transmission devices and operating efficiency of pumping unit greatly.This paper introduce the basic structure and operating principle of the permanent magnet linear motor, and analyze its http://www.999magnet.com/products/110-sintered-neodymium-magnets magnetic field pattern detailedly. It also analyze the control policy of electric machinery , and use direct force control for the permanent magnet linear motor on the basis of the results. This paper also study the basic structure and domination principle of the direct force control, design the basic structure of the pumping unit driven by permanent magnet linear motor, analyse the polished rod load and equilibrium principle. Analyse the rod pumping system’s prediction model bring forward by S.G. Gibbs and analyze the sucker rod’s running status through the computer, and design the concrete parameter of the permanent magnet linear motor as a result. And design the concrete structure of pumping unit system. Figure out the high energy consumption and low efficiency problem of beam pumping unit.it has a big development potential.
2012年10月29日星期一
Research on High-Performance Vector Control Strategy for PMSM Speed Adjustment System
Research on High-Performance Vector Control Strategy for PMSM Speed Adjustment System
The research on PMSM has entered a new stage since the 1980’ s withthe improvement of ratio between the performance and the price of the PMmaterial and the development of the power electronics devices. PMSMspeed adjustment system of its good performance has applied more andmore popularly in industrial sector. So the study on PMSM speedadjustment system becomes a kind of development trend, havingtheoretical significance and practical application value.The Neodymium Magnets thesis uses Digital Signal Processor (DSP) TMS320LF2407Aspecial for digital motor control of TI corporation as the control core, anddevelops the software and hardware of the full-digital PMSM vectorcontrol speed adjustment system which elevates its availability.
Firstly, The thesis analyze the mathematics model of PMSM, studyvector control of PMSM and space vector PWM, and discuss the controllerdesign problem for the speed and current control.The thesis presents novelfuzzy control strategy for PI speed controller and adopts the new design ofcircuit loop with cross-multiplying terms to PI current controller, whichform an improved PMSM AC speed adjustment system. At last, the improved speed adjustment system is simulated under MATLAB/SIMULINK. From the simulation results, it is verified that the improvedvector control strategy of this paper can be easily designed, moreover, itenhances the rapidness of the system torque response and the controlaccuracy of speed. It is also robust against the perturbation of the http://www.999magnet.com rotorparameter. Thus, the static and dynamic characteristics of the system areensured validly.Secondly, the main structures of the software and hardware parts ofthe speed adjustment system are introduced. Principles and realization ofthe main functional blocks of these two parts are also illuminated. In thehardware system, the main circuit, protective circuit and control circuit aredesigned in detail in this paper. Based on the hardware circuit, the softwareis programmed by using assembly language and C language combined.The flow charts of main program and PWM interrupt service routines aregiven.Finally, the program is debugged on the designed software andhardware system .The results of experiment further demonstrates thereasonableness and superiority of the proposed design method.
The research on PMSM has entered a new stage since the 1980’ s withthe improvement of ratio between the performance and the price of the PMmaterial and the development of the power electronics devices. PMSMspeed adjustment system of its good performance has applied more andmore popularly in industrial sector. So the study on PMSM speedadjustment system becomes a kind of development trend, havingtheoretical significance and practical application value.The Neodymium Magnets thesis uses Digital Signal Processor (DSP) TMS320LF2407Aspecial for digital motor control of TI corporation as the control core, anddevelops the software and hardware of the full-digital PMSM vectorcontrol speed adjustment system which elevates its availability.
Firstly, The thesis analyze the mathematics model of PMSM, studyvector control of PMSM and space vector PWM, and discuss the controllerdesign problem for the speed and current control.The thesis presents novelfuzzy control strategy for PI speed controller and adopts the new design ofcircuit loop with cross-multiplying terms to PI current controller, whichform an improved PMSM AC speed adjustment system. At last, the improved speed adjustment system is simulated under MATLAB/SIMULINK. From the simulation results, it is verified that the improvedvector control strategy of this paper can be easily designed, moreover, itenhances the rapidness of the system torque response and the controlaccuracy of speed. It is also robust against the perturbation of the http://www.999magnet.com rotorparameter. Thus, the static and dynamic characteristics of the system areensured validly.Secondly, the main structures of the software and hardware parts ofthe speed adjustment system are introduced. Principles and realization ofthe main functional blocks of these two parts are also illuminated. In thehardware system, the main circuit, protective circuit and control circuit aredesigned in detail in this paper. Based on the hardware circuit, the softwareis programmed by using assembly language and C language combined.The flow charts of main program and PWM interrupt service routines aregiven.Finally, the program is debugged on the designed software andhardware system .The results of experiment further demonstrates thereasonableness and superiority of the proposed design method.
Study on DSP-Based Direct Torque Control System of PMSM
Study on DSP-Based Direct Torque Control System of PMSM
Direct Torque Control(DTC) was first proposed in 1980s by Takahashi and Depenbrock respectively, this new control theory was improved to be a great success when induced on inductance motor because of its feature of excellent dynamic property and simple construction. Neodymium Magnets The first transducer adopting DTC technology was developed by ABB which win DTC fame of next generation AC drive technology. Permanent Magnet Synchronous Motor(PMSM) has the property of high power density, high efficiency and high control ability, so it is widely used in AC drive which makes it one of the most potential motor. Combining the DTC and PMSM is becoming a focus of researchers’at home and abroad. This paper makes deeply research on the PMSM-DTC strategy and its realization method on the basis of analyzing and concluding PMSM-DTC theory. This paper analyzes the fundamental theory of DTC in PMSM and yields the model of the combination of PMSM and DTC. Two control strategies that are switch table based and space vector modulation DTC and their simulation analyze are introduced on basis of the PMSM-DTC model.On the basis of overall control strategy, this paper gives the detail analyze of key points in PMSM-DTC and yields their effective solution. The key points of PMSM-DTC includes the estimation method of stator flux, the compensation method http://www.999magnet.com of stator resistance variation, the compensation method of inverter dead-time and the estimation method of rotor initial position. All the simulation result of justify the effective of the solutions.At last, the TMS320F2812DSP based experimental platform is developed to verify all the analyses and simulation results of the control strategy and its key points. The effectiveness of the control strategy adopted and superiority of the SVM-DTC control strategy are confirmed on the basis of analyzing and comparing the massive experimental result, at the same time, the merits that are quick toque dynamic property and low torque and flux ripple of SVM-DTC strategy are justified.
Direct Torque Control(DTC) was first proposed in 1980s by Takahashi and Depenbrock respectively, this new control theory was improved to be a great success when induced on inductance motor because of its feature of excellent dynamic property and simple construction. Neodymium Magnets The first transducer adopting DTC technology was developed by ABB which win DTC fame of next generation AC drive technology. Permanent Magnet Synchronous Motor(PMSM) has the property of high power density, high efficiency and high control ability, so it is widely used in AC drive which makes it one of the most potential motor. Combining the DTC and PMSM is becoming a focus of researchers’at home and abroad. This paper makes deeply research on the PMSM-DTC strategy and its realization method on the basis of analyzing and concluding PMSM-DTC theory. This paper analyzes the fundamental theory of DTC in PMSM and yields the model of the combination of PMSM and DTC. Two control strategies that are switch table based and space vector modulation DTC and their simulation analyze are introduced on basis of the PMSM-DTC model.On the basis of overall control strategy, this paper gives the detail analyze of key points in PMSM-DTC and yields their effective solution. The key points of PMSM-DTC includes the estimation method of stator flux, the compensation method http://www.999magnet.com of stator resistance variation, the compensation method of inverter dead-time and the estimation method of rotor initial position. All the simulation result of justify the effective of the solutions.At last, the TMS320F2812DSP based experimental platform is developed to verify all the analyses and simulation results of the control strategy and its key points. The effectiveness of the control strategy adopted and superiority of the SVM-DTC control strategy are confirmed on the basis of analyzing and comparing the massive experimental result, at the same time, the merits that are quick toque dynamic property and low torque and flux ripple of SVM-DTC strategy are justified.
径向磁场双转子永磁电机研究
径向磁场双转子永磁电机研究
High efficiency and high torque density are two basic features for an electric machine. Rare earth permanent magnet machine has high efficiency and high torque density because of the use of rare earth permanent magnet. However, the cost of the machine is raised . So it has very important sense to design a ferrite permanent magnet machine with high force index and low cost. The thesis makes a primary research of an electric machine which can satisfy the advantages above. Generally speaking, the research of the thesis mainly includes the following points:In the first part, the structure neodymium magnets and principle of the machine are discussed. Then the thesis gives the analytical method and sums up the advantages of the machine compared to the traditional ones.The second part gives the calculation of the inductance. First of all, this part establishes the magnetic circuit model of the machine by which the inductance is calculated. The inductance formula is given. In order to check the formula, the thesis also calculates the inductance using electromagnetic software. Then this part gives the contrast of the two kinds of results, giving the characteristics of each result.The third part analyzes the http://www.chinamagnets.biz cogging torque in detail. First of all, this part gives some methods for reducing the torque fluctuation of the machine. The methods includes slot opening shifting, varying slot opening angular width, varying PM angular width, varying the middle line of the PM. In order to check the methods, the thesis gives the formula of cogging torque first, and then proves the methods using the formula. The thesis also calculates the cogging torque using electromagnetic software, giving the curve of the cogging torque. Through the two different ways, the methods are proved to be practical. At last, this part gives the infection to average torque of the methods.The fourth part discusses the design thought, bringing forward the
High efficiency and high torque density are two basic features for an electric machine. Rare earth permanent magnet machine has high efficiency and high torque density because of the use of rare earth permanent magnet. However, the cost of the machine is raised . So it has very important sense to design a ferrite permanent magnet machine with high force index and low cost. The thesis makes a primary research of an electric machine which can satisfy the advantages above. Generally speaking, the research of the thesis mainly includes the following points:In the first part, the structure neodymium magnets and principle of the machine are discussed. Then the thesis gives the analytical method and sums up the advantages of the machine compared to the traditional ones.The second part gives the calculation of the inductance. First of all, this part establishes the magnetic circuit model of the machine by which the inductance is calculated. The inductance formula is given. In order to check the formula, the thesis also calculates the inductance using electromagnetic software. Then this part gives the contrast of the two kinds of results, giving the characteristics of each result.The third part analyzes the http://www.chinamagnets.biz cogging torque in detail. First of all, this part gives some methods for reducing the torque fluctuation of the machine. The methods includes slot opening shifting, varying slot opening angular width, varying PM angular width, varying the middle line of the PM. In order to check the methods, the thesis gives the formula of cogging torque first, and then proves the methods using the formula. The thesis also calculates the cogging torque using electromagnetic software, giving the curve of the cogging torque. Through the two different ways, the methods are proved to be practical. At last, this part gives the infection to average torque of the methods.The fourth part discusses the design thought, bringing forward the
The Microstructure and Magnetic Properties of Nanocomposites
The Microstructure and Magnetic Properties of Nanocomposites
The investigation and development status have been synthetically commented in this paper. The key factors controlling the coercivity in nanocomposite permanent magnets have been discussed theoretically by designing different phase-distribution models. Besides, the dependence of magnetic property (especially coercivity) in nanocomposite permanent magnets on the composition preparing processes and microstructure has been investigated emphatically. Our main wok includes:1. Effects of grain size and phase distribution on the coercivity in nanocomposite permanent magnetsBased on effective anisotropy model, we have calculated the dependence of coercivity on the grain size neodymium magnets and volume fraction of soft and hard phases by using the statistical mean. Firstly, the coercivity of nanocomposite with given volume fraction of soft phase and the same soft and hard grain sizes decreases with the minishing grain size and rapidly decreases whlie D is about 20nm. Secondly, the coercivity of nanocomposite with given volume fraction of soft phase and soft grain size show the peak value with the variation of hard grain size. This phenomenon could be attributed to the random phase distribution of soft and hard grains.
Thirdly, the coercivity of nanocomposite with given volume fraction of hard phase and hard grain size decreases with minishing soft grain size.2. Effects of preparing processed and composition on the microstructure and magnetic properties of nanocomposite prepared by using the melt-spinning and annealing technique.(1) Effect of wheel speed on the microstructure of nanocompositeThe Nd11Fe83B6 ribbons prepared at lower wheel speed of 20m/s basically consist of soft a-Fe and hard 2:14:1 phases and the hard magnetic properties are lower because of the non-uniformity http://www.chinamagnets.biz of grain size. When the wheel speed increases to 30m/s, the amount of a-Fe and 2:14:1 phases decreased obviously and an amorphous phase appeared. Fully amorphous ribbons were obtained when the wheel speed reached at 58m/s.(2) Effect of heat treatment on the microstructure and magnetic properties of nanocompositeThe exact temperature and time of heat treatment are restrict with each other.
In order to get high magnetic property, the annealing procedure should make the amorphous material completely crystallize, but prevent from emergence of over-big grains. The annealing condition is either the higher temperature with shorter time, or the lower temperature with longer time. Annealing at lower temperature with long time would be more useful to improve magnetic properties of nanocomposite than that at higher temperature with short time. After annealed at 650℃for 5 minutes, excellent hard magnetic properties which of Nd82Dy2.8Fe76.4Co6.6B6 were jHc = 376kA/m, Br=0.8T, (BH)max=94kJ/m3, were obtained and the coercivity reached maximum when the grain size is about 22nm.(3) Effects of element addition on the microstructure and magnetic properties of nanocompositeCo addition can simultaneously increase the anisotropy field and coercivity because of Co substituting Fe atoms of both the hard magnetic phase and the soft phase in nanocomposite. And, http://www.chinamagnets.biz Co addition can enhance the exchange interaction and increase the Curie temperature. Co atoms enter to the grain boundary so as to get fine grain size during the annealing, and the enhanced the exchange-coupling interaction between the grains and increased the coercivity.Dy addition can increase anisotropy field and coercivity. But, Dy addition makes the Curie temperature decrease a little. Co addition remedies the defect of Dy addition. The Curie temperature of Nd82Dy2.8Fe76.4Co6.6B6 ribbons prepared at wheel speed of 58m/s increases to 655K, and the coercivity also increases obviously. The magnetic properties of Nd8.2Dy2.8Fe76.4Co6.6B6 are jHc= 1612kA/m, Br=1.3T, (BH)max = 351kJ/m3. The synthesis hard magnetic properties obviously enhanced comparing to Nd11Fe83B6.
The investigation and development status have been synthetically commented in this paper. The key factors controlling the coercivity in nanocomposite permanent magnets have been discussed theoretically by designing different phase-distribution models. Besides, the dependence of magnetic property (especially coercivity) in nanocomposite permanent magnets on the composition preparing processes and microstructure has been investigated emphatically. Our main wok includes:1. Effects of grain size and phase distribution on the coercivity in nanocomposite permanent magnetsBased on effective anisotropy model, we have calculated the dependence of coercivity on the grain size neodymium magnets and volume fraction of soft and hard phases by using the statistical mean. Firstly, the coercivity of nanocomposite with given volume fraction of soft phase and the same soft and hard grain sizes decreases with the minishing grain size and rapidly decreases whlie D is about 20nm. Secondly, the coercivity of nanocomposite with given volume fraction of soft phase and soft grain size show the peak value with the variation of hard grain size. This phenomenon could be attributed to the random phase distribution of soft and hard grains.
Thirdly, the coercivity of nanocomposite with given volume fraction of hard phase and hard grain size decreases with minishing soft grain size.2. Effects of preparing processed and composition on the microstructure and magnetic properties of nanocomposite prepared by using the melt-spinning and annealing technique.(1) Effect of wheel speed on the microstructure of nanocompositeThe Nd11Fe83B6 ribbons prepared at lower wheel speed of 20m/s basically consist of soft a-Fe and hard 2:14:1 phases and the hard magnetic properties are lower because of the non-uniformity http://www.chinamagnets.biz of grain size. When the wheel speed increases to 30m/s, the amount of a-Fe and 2:14:1 phases decreased obviously and an amorphous phase appeared. Fully amorphous ribbons were obtained when the wheel speed reached at 58m/s.(2) Effect of heat treatment on the microstructure and magnetic properties of nanocompositeThe exact temperature and time of heat treatment are restrict with each other.
In order to get high magnetic property, the annealing procedure should make the amorphous material completely crystallize, but prevent from emergence of over-big grains. The annealing condition is either the higher temperature with shorter time, or the lower temperature with longer time. Annealing at lower temperature with long time would be more useful to improve magnetic properties of nanocomposite than that at higher temperature with short time. After annealed at 650℃for 5 minutes, excellent hard magnetic properties which of Nd82Dy2.8Fe76.4Co6.6B6 were jHc = 376kA/m, Br=0.8T, (BH)max=94kJ/m3, were obtained and the coercivity reached maximum when the grain size is about 22nm.(3) Effects of element addition on the microstructure and magnetic properties of nanocompositeCo addition can simultaneously increase the anisotropy field and coercivity because of Co substituting Fe atoms of both the hard magnetic phase and the soft phase in nanocomposite. And, http://www.chinamagnets.biz Co addition can enhance the exchange interaction and increase the Curie temperature. Co atoms enter to the grain boundary so as to get fine grain size during the annealing, and the enhanced the exchange-coupling interaction between the grains and increased the coercivity.Dy addition can increase anisotropy field and coercivity. But, Dy addition makes the Curie temperature decrease a little. Co addition remedies the defect of Dy addition. The Curie temperature of Nd82Dy2.8Fe76.4Co6.6B6 ribbons prepared at wheel speed of 58m/s increases to 655K, and the coercivity also increases obviously. The magnetic properties of Nd8.2Dy2.8Fe76.4Co6.6B6 are jHc= 1612kA/m, Br=1.3T, (BH)max = 351kJ/m3. The synthesis hard magnetic properties obviously enhanced comparing to Nd11Fe83B6.
Control System of High Speed PMSM with Accessorial Windings to Detect Rotor Position
Control System of High Speed PMSM with Accessorial Windings to Detect Rotor Position
The high-speed PMSM (H-PMSM) with sinusoidal currents is the best choice for high-speed operation because of the high efficiency, low torque ripple, lower rotor losses and excellent control performance. However, it is difficult to detect the rotor position because of the complex machinery. This thesis presents a novel method of detecting HPMSM rotor position through the line back EMF of accessorial signal windings and designed a set of H-PMSM’s controller aimed to this new method of detecting rotor position. Furthermore, after the compensation Neodymium Magnets of this new method of rotor position detection this thesis used DSP to design a system of Field Oriented Control based on SVPWM.This thesis presents a novel method using accessorial signal windings to detect the rotor position and speed of high-speed PMSM in wide speed range. These accessorial windings’distribution is similar to the power windings which are inlayed in stator. Aimed to detecting the rotor position from the accessorial signal windings, this article designed a circuit of processing line back EMF in signal windings.Taking this especial method into account, this thesis analyzed the factors of phasic lagging of line back EMF in signal windings from the aspect of circuit, the effect of armature http://www.999magnet.com reaction and the infection of the 5th order harmonic of current wave. Finally, this thesis designed a method of compensation of rotor position detection. The results showed that this method of compensation is effective to meliorate the precision of rotor position detection.With regard to the hardware design, this thesis designed an H-PMSM controller using DSP to realize the reliable operating; on the aspect of control strategy, the vector model was studied and this thesis realized a system of Field Oriented Control based on SVPWM.
The high-speed PMSM (H-PMSM) with sinusoidal currents is the best choice for high-speed operation because of the high efficiency, low torque ripple, lower rotor losses and excellent control performance. However, it is difficult to detect the rotor position because of the complex machinery. This thesis presents a novel method of detecting HPMSM rotor position through the line back EMF of accessorial signal windings and designed a set of H-PMSM’s controller aimed to this new method of detecting rotor position. Furthermore, after the compensation Neodymium Magnets of this new method of rotor position detection this thesis used DSP to design a system of Field Oriented Control based on SVPWM.This thesis presents a novel method using accessorial signal windings to detect the rotor position and speed of high-speed PMSM in wide speed range. These accessorial windings’distribution is similar to the power windings which are inlayed in stator. Aimed to detecting the rotor position from the accessorial signal windings, this article designed a circuit of processing line back EMF in signal windings.Taking this especial method into account, this thesis analyzed the factors of phasic lagging of line back EMF in signal windings from the aspect of circuit, the effect of armature http://www.999magnet.com reaction and the infection of the 5th order harmonic of current wave. Finally, this thesis designed a method of compensation of rotor position detection. The results showed that this method of compensation is effective to meliorate the precision of rotor position detection.With regard to the hardware design, this thesis designed an H-PMSM controller using DSP to realize the reliable operating; on the aspect of control strategy, the vector model was studied and this thesis realized a system of Field Oriented Control based on SVPWM.
2012年10月28日星期日
Study on PMSM Design and Air GAP Magnetic Field Optimizing Design
Study on PMSM Design and Air GAP Magnetic Field Optimizing Design
In the field of electrical machine, the electromagnetic design and drive control of permanent synchronous motor (PMSM) are foreland problems. In this dissertation, the systematic research of motor’s parameters computation and performance has been done by the combination of electromagnetic calculation program and motor design software, and which is in the base of the fundamental electromagnetic theory. As major impact factor of motor performance , with focus on air-gap Ball Neodymium Magnets induction. A simple method has been advanced. At last, A motor design process has been compiled.Firstly,PMSM has a wide applicative territory. According to different working situation, the structure of the motor’s magnetic circuit is various. In this dissertation, the magnetic structure of the motor is analyzed in details. Meanwhile, the features of frequency control are summarized, which is the main point of the future’s electromagnetic design. The choice of the material of permanent magnet, which is a key to the design of motor, is researched in this dissertation. Furthermore, the motor’s dimension and process of computing the motor’s working feature are made out by using electromagnetic calculating program.In the base of analysis of permanent-magnet’s mathematic model, the example is applied to design a surface mounted permanent-magnet and an interior permanent-magnet. then analyzing many factors which influence air-gap induction, including thickness of permanent-magnet, length of air gap,pole http://www.chinamagnets.biz embrace, material of shaft. The major reason is analyzed as a focal point. Optimization design of air gap is another important program. in the base of analysis of finite element techniques, least-squares techniques and curve fitting method,by using software of Autocad Ansoft Mathcad, including a simple method of unequal thickness permanent-magnet.Finally, depending on the test of model machine, gains motor parameters and the data of controlling system, and proves the rationality of the designed motor system by theoretic analysis and experiments.
In the field of electrical machine, the electromagnetic design and drive control of permanent synchronous motor (PMSM) are foreland problems. In this dissertation, the systematic research of motor’s parameters computation and performance has been done by the combination of electromagnetic calculation program and motor design software, and which is in the base of the fundamental electromagnetic theory. As major impact factor of motor performance , with focus on air-gap Ball Neodymium Magnets induction. A simple method has been advanced. At last, A motor design process has been compiled.Firstly,PMSM has a wide applicative territory. According to different working situation, the structure of the motor’s magnetic circuit is various. In this dissertation, the magnetic structure of the motor is analyzed in details. Meanwhile, the features of frequency control are summarized, which is the main point of the future’s electromagnetic design. The choice of the material of permanent magnet, which is a key to the design of motor, is researched in this dissertation. Furthermore, the motor’s dimension and process of computing the motor’s working feature are made out by using electromagnetic calculating program.In the base of analysis of permanent-magnet’s mathematic model, the example is applied to design a surface mounted permanent-magnet and an interior permanent-magnet. then analyzing many factors which influence air-gap induction, including thickness of permanent-magnet, length of air gap,pole http://www.chinamagnets.biz embrace, material of shaft. The major reason is analyzed as a focal point. Optimization design of air gap is another important program. in the base of analysis of finite element techniques, least-squares techniques and curve fitting method,by using software of Autocad Ansoft Mathcad, including a simple method of unequal thickness permanent-magnet.Finally, depending on the test of model machine, gains motor parameters and the data of controlling system, and proves the rationality of the designed motor system by theoretic analysis and experiments.
2012年10月25日星期四
Research on the Internal Composite-rotor Controllable-flux Permanent Magnet Synchronous Motor and Control Method
Research on the Internal Composite-rotor Controllable-flux Permanent Magnet Synchronous Motor and Control Method
The operation range of Permanent Magnet Synchronous Machines (PMSMs) is limited because the flux of the rotor cannot be changed. The problems of many studies are the capability of flux weakening is too small, the structures are too complex, and the loss of the motor is neodymium magnets too high. This paper analyzed a new type PMSM-the internal composite-rotor controllable-flux PMSM which get rid of the disadvantage of the controllable-flux motor given by Vlado Ostovic. The motor can memorize the level of the flux after the flux of the rotor is changed, so it can also be called Memory Motor.In Memory Motor’s magnetic circuit, the flux can be strengthened when the AlNiCo magnet is positively magnetized or be weakened when the AlNiCo magnet is reverse magnetized.
On magnetic hysteresis cycles, it can be find that the NdFeB has litter effect and the AlNiCo in properly size can be change the operating point by the magnetic motive force from the stator. The result of the finite element analysis of the two prototypes is shown that the magnetic density in the air gap between the two extreme statuses is changed more than four times without load. The test of the prototype gave a magnetic density and magnetic motive force curve, which is similar to its hysteresis cycle, which prove that the memory motor is a feasible design. According to the http://www.chinamagnets.biz model and control strategy of the normal PMSM, the mathematic model of the memory motor is analyzed and the control method is designed. When the motor need not change the flux of the rotor, the id=0 strategy is adopted. The stator current iq is controlled by speed regulator. And then the dq variables are transformed to three phases current to control the motor by the current relay regulator. When the flux of the rotor need be changed, an impulse of the id will be created. The magnet in the rotor will move their operating point to new position. The status of the magnetic field in the rotor will be changed. And then the motor come back to the steady status which also uses the id=0 control strategy. The normal PI regulator can not adapt the process quicly because the current and the magnetic field will change tempestuously. So a Fuzzy-PI switch regulator is designed. After the fluctuating process fade away, the simply PI regulator will replace it to get better steady effect. At last a DSP based speed control system is present, which considered both the hardware and software.
The operation range of Permanent Magnet Synchronous Machines (PMSMs) is limited because the flux of the rotor cannot be changed. The problems of many studies are the capability of flux weakening is too small, the structures are too complex, and the loss of the motor is neodymium magnets too high. This paper analyzed a new type PMSM-the internal composite-rotor controllable-flux PMSM which get rid of the disadvantage of the controllable-flux motor given by Vlado Ostovic. The motor can memorize the level of the flux after the flux of the rotor is changed, so it can also be called Memory Motor.In Memory Motor’s magnetic circuit, the flux can be strengthened when the AlNiCo magnet is positively magnetized or be weakened when the AlNiCo magnet is reverse magnetized.
On magnetic hysteresis cycles, it can be find that the NdFeB has litter effect and the AlNiCo in properly size can be change the operating point by the magnetic motive force from the stator. The result of the finite element analysis of the two prototypes is shown that the magnetic density in the air gap between the two extreme statuses is changed more than four times without load. The test of the prototype gave a magnetic density and magnetic motive force curve, which is similar to its hysteresis cycle, which prove that the memory motor is a feasible design. According to the http://www.chinamagnets.biz model and control strategy of the normal PMSM, the mathematic model of the memory motor is analyzed and the control method is designed. When the motor need not change the flux of the rotor, the id=0 strategy is adopted. The stator current iq is controlled by speed regulator. And then the dq variables are transformed to three phases current to control the motor by the current relay regulator. When the flux of the rotor need be changed, an impulse of the id will be created. The magnet in the rotor will move their operating point to new position. The status of the magnetic field in the rotor will be changed. And then the motor come back to the steady status which also uses the id=0 control strategy. The normal PI regulator can not adapt the process quicly because the current and the magnetic field will change tempestuously. So a Fuzzy-PI switch regulator is designed. After the fluctuating process fade away, the simply PI regulator will replace it to get better steady effect. At last a DSP based speed control system is present, which considered both the hardware and software.
Research of Permanent Magnet Synchronous Motor Direct Torque Control Based on Fuzzy Logic
Research of Permanent Magnet Synchronous Motor Direct Torque Control Based on Fuzzy Logic
With the development of high performance permanent-magnet material, power electronic technique, large scale integrated-circuit and computer technology, the permanent magnet synchronous motor (PMSM) is widely used because of its small volume, high power density, high efficiency and power factor. Direct torque control (DTC) was put forward aiming at induction motor in the neodymium magnets 1980s, it is another high performance control strategy for ac motor after vector control. With the solving of DTC strategy’s theoretical foundation in PMSM, the direct torque control of permanent magnet synchronous motor was concerned more and more.In this paper, the principle of coordinate transformation was introduced at first, and then the basic theory of PMSM DTC was discussed and the space voltage vector switching table of traditional DTC strategy was derived according to the model of PMSM.
Improved vector switching table of traditional DTC and introduced zero-voltage vector, which made torque keeping invariant, decreased action frequency of switching devices and improved control performance of system. Aiming at the fault of traditional DTC easily produced torque pulsation, the model of PMSM DTC based spaced vector modulation was given according to the foundation of space voltage vector modulation. Then the basic principle of fuzzy logic is introduced to the PMSM DTC. According to the feature that the flux hysteresis and torque hysteresis are fuzzy themselves, they can be fuzzified and the repository can be organized classically to complete the choice of space voltage vector.On the premise of theory analysis above, the simulation modules of flux http://www.chinamagnets.biz and torque calculator, electromagnetic torque hysteresis, stator flux linkage hysteresis, sector choice and fuzzy controller of PMSM have been set up under the MATLAB/Simulink. The simulation of DTC control strategy with space vector modulation and fuzzy control are presented which demonstrate the fundamental theory of DTC control strategy for PMSM. The DTC of fuzzy control strategy and traditional control strategy are compared, the simulation results shows that fuzzy control strategy can decrease torque pulsation, improve dynamic and static performance of systems.On the basic of theoretical derivation and simulation verification, the hardware and software are designed for the digital signal processor (DSP)-based system. Furthermore, the DTC control system platform for PMSM is constructed. The hardware system of this paper includes main circuits, control circuits, drive circuits and measurement circuits. Then a driving experiment based SPWM and SVPWM is completed with drive board, to lay a foundation for further improvement.
With the development of high performance permanent-magnet material, power electronic technique, large scale integrated-circuit and computer technology, the permanent magnet synchronous motor (PMSM) is widely used because of its small volume, high power density, high efficiency and power factor. Direct torque control (DTC) was put forward aiming at induction motor in the neodymium magnets 1980s, it is another high performance control strategy for ac motor after vector control. With the solving of DTC strategy’s theoretical foundation in PMSM, the direct torque control of permanent magnet synchronous motor was concerned more and more.In this paper, the principle of coordinate transformation was introduced at first, and then the basic theory of PMSM DTC was discussed and the space voltage vector switching table of traditional DTC strategy was derived according to the model of PMSM.
Improved vector switching table of traditional DTC and introduced zero-voltage vector, which made torque keeping invariant, decreased action frequency of switching devices and improved control performance of system. Aiming at the fault of traditional DTC easily produced torque pulsation, the model of PMSM DTC based spaced vector modulation was given according to the foundation of space voltage vector modulation. Then the basic principle of fuzzy logic is introduced to the PMSM DTC. According to the feature that the flux hysteresis and torque hysteresis are fuzzy themselves, they can be fuzzified and the repository can be organized classically to complete the choice of space voltage vector.On the premise of theory analysis above, the simulation modules of flux http://www.chinamagnets.biz and torque calculator, electromagnetic torque hysteresis, stator flux linkage hysteresis, sector choice and fuzzy controller of PMSM have been set up under the MATLAB/Simulink. The simulation of DTC control strategy with space vector modulation and fuzzy control are presented which demonstrate the fundamental theory of DTC control strategy for PMSM. The DTC of fuzzy control strategy and traditional control strategy are compared, the simulation results shows that fuzzy control strategy can decrease torque pulsation, improve dynamic and static performance of systems.On the basic of theoretical derivation and simulation verification, the hardware and software are designed for the digital signal processor (DSP)-based system. Furthermore, the DTC control system platform for PMSM is constructed. The hardware system of this paper includes main circuits, control circuits, drive circuits and measurement circuits. Then a driving experiment based SPWM and SVPWM is completed with drive board, to lay a foundation for further improvement.
2012年10月22日星期一
Study of Dynamic Performance of Permanent Magnet Linear Synchronous Motor
Study of Dynamic Performance of Permanent Magnet Linear Synchronous Motor
Permanent magnet liner synchronous motor has been attented by more and more people,because of good dynamic performance and dependability. With applied extensively, permanent magnet liner synchronous motor is asked for dynamic performance. Neodymium Magnets The main factor is thrust ripple of permanent magnet liner synchronous motor. This paper analyses the ficld and thrust characteristic of permanent magnet liner synchronous motor by finite element analysis.According to principle and structure of permanent magnet liner synchronous motor ,this paper analyses ficld by Ansoft software. Magnetic flux, magnetic density ,gap and harmonic distribution are consisted of two results.Thrust characteristic is analysesed.Thrust curves of no-loaded and on-loaded are gained by time-stepping FEM from start to steady-state.This paper analyses thrust ripple principia, http://www.999magnet.com adopts Halbach array and the principle ofHalbach array. The structure and magnetized distribution of Halbach array are analyzed. The suited structure and magnetized distribution have been confirmed in a permanent magnet liner synchronous motor. The thrust characteristic are compared with different magnetized distributions of liner synchronous motors. The results present that the permanent magnet liner synchronous motor with Halbach array can improve the magnetized distribution, enhance the thrust of motor and reduce the thrust ripple. So Halbach array permanent magnet liner synchronous motor is prior to the normal array one.
Permanent magnet liner synchronous motor has been attented by more and more people,because of good dynamic performance and dependability. With applied extensively, permanent magnet liner synchronous motor is asked for dynamic performance. Neodymium Magnets The main factor is thrust ripple of permanent magnet liner synchronous motor. This paper analyses the ficld and thrust characteristic of permanent magnet liner synchronous motor by finite element analysis.According to principle and structure of permanent magnet liner synchronous motor ,this paper analyses ficld by Ansoft software. Magnetic flux, magnetic density ,gap and harmonic distribution are consisted of two results.Thrust characteristic is analysesed.Thrust curves of no-loaded and on-loaded are gained by time-stepping FEM from start to steady-state.This paper analyses thrust ripple principia, http://www.999magnet.com adopts Halbach array and the principle ofHalbach array. The structure and magnetized distribution of Halbach array are analyzed. The suited structure and magnetized distribution have been confirmed in a permanent magnet liner synchronous motor. The thrust characteristic are compared with different magnetized distributions of liner synchronous motors. The results present that the permanent magnet liner synchronous motor with Halbach array can improve the magnetized distribution, enhance the thrust of motor and reduce the thrust ripple. So Halbach array permanent magnet liner synchronous motor is prior to the normal array one.
Research on Automatic Measuring of Permanent Magnetic Synchronous Servo Motor
Research on Automatic Measuring of Permanent Magnetic Synchronous Servo Motor
These days, automatic measuring system has new approach for the computers a great deal application. Improving the precision and speed of motor test, carrying motor identity testing and adopting new testing method becomes feasibility because of the technique of electron developed rapidly in latter-day. In the developing background, the paper carries through the research of the motor automatic measuring and its control system.The main content of this paper is the software and hardware researching of Permanent Magnetic Synchronous Servo Motor(PMSM). This neodymium magnets system is designed to measure motor’s three important parameters including stator coil inductance, stalling torque and back EMF. All of these test results are used as basis for product detect. According the analysis of current test methods of the three parameters, I have found that the normal test methods can not apply for automatic measurement additionally, the automatic measuring system are usually strictly kept in secrete as know-how by motor manufacturer, so the purpose of my paper is to develop a set of automatic system to measure those three methods for product detection.This paper adopts PC and muti-fuction Data Acquisition Block (DAQ) as core controlling equipments, and other sensors relays as secondary equipments. The software of the automatic testing system. is developed Using LabVIEW to develop the system’s working platform and software, through ADO technique, combining SQL http://www.chinamagnets.biz database and Excel digital table etc applied software to develop the printing system of data management, inquiring ,forms for reporting statistics and graph curved line.The paper first introduced the background of this project, then elaborate each parameter’test method. The testing system improved the testing precision, reduced the infection of the testing people, realized the auto computer control. On the other hand, the testing system can realize the auto manage to the testing data, draw characteristic curve automatically. The system has the characteristics of simple structure, satisfied accuracy and higher reliability.
These days, automatic measuring system has new approach for the computers a great deal application. Improving the precision and speed of motor test, carrying motor identity testing and adopting new testing method becomes feasibility because of the technique of electron developed rapidly in latter-day. In the developing background, the paper carries through the research of the motor automatic measuring and its control system.The main content of this paper is the software and hardware researching of Permanent Magnetic Synchronous Servo Motor(PMSM). This neodymium magnets system is designed to measure motor’s three important parameters including stator coil inductance, stalling torque and back EMF. All of these test results are used as basis for product detect. According the analysis of current test methods of the three parameters, I have found that the normal test methods can not apply for automatic measurement additionally, the automatic measuring system are usually strictly kept in secrete as know-how by motor manufacturer, so the purpose of my paper is to develop a set of automatic system to measure those three methods for product detection.This paper adopts PC and muti-fuction Data Acquisition Block (DAQ) as core controlling equipments, and other sensors relays as secondary equipments. The software of the automatic testing system. is developed Using LabVIEW to develop the system’s working platform and software, through ADO technique, combining SQL http://www.chinamagnets.biz database and Excel digital table etc applied software to develop the printing system of data management, inquiring ,forms for reporting statistics and graph curved line.The paper first introduced the background of this project, then elaborate each parameter’test method. The testing system improved the testing precision, reduced the infection of the testing people, realized the auto computer control. On the other hand, the testing system can realize the auto manage to the testing data, draw characteristic curve automatically. The system has the characteristics of simple structure, satisfied accuracy and higher reliability.
Research on Automatic Measuring of Permanent Magnetic Synchronous Servo Motor
Research on Automatic Measuring of Permanent Magnetic Synchronous Servo Motor
These days, automatic measuring system has new approach for the computers a great deal application. Improving the precision and speed of motor test, carrying motor identity testing and adopting new testing method becomes feasibility because of the technique neodymium magnets of electron developed rapidly in latter-day. In the developing background, the paper carries through the research of the motor automatic measuring and its control system.The main content of this paper is the software and hardware researching of Permanent Magnetic Synchronous Servo Motor(PMSM).
This system is designed to measure motor’s three important parameters including stator coil inductance, stalling torque and back EMF. All of these test results are used as basis for product detect. According the analysis of current test methods of the three parameters, I have found that the normal test methods can not apply for automatic measurement additionally, the automatic measuring system are usually strictly kept in secrete as know-how by motor manufacturer, so the purpose of my paper is to develop a set of automatic system to measure those three methods for product detection.This paper adopts PC and muti-fuction Data Acquisition Block (DAQ) as core controlling equipments, http://www.chinamagnets.biz and other sensors relays as secondary equipments. The software of the automatic testing system. is developed Using LabVIEW to develop the system’s working platform and software, through ADO technique, combining SQL database and Excel digital table etc applied software to develop the printing system of data management, inquiring ,forms for reporting statistics and graph curved line.The paper first introduced the background of this project, then elaborate each parameter’test method. The testing system improved the testing precision, reduced the infection of the testing people, realized the auto computer control. On the other hand, the testing system can realize the auto manage to the testing data, draw characteristic curve automatically. The system has the characteristics of simple structure, satisfied accuracy and higher reliability.
These days, automatic measuring system has new approach for the computers a great deal application. Improving the precision and speed of motor test, carrying motor identity testing and adopting new testing method becomes feasibility because of the technique neodymium magnets of electron developed rapidly in latter-day. In the developing background, the paper carries through the research of the motor automatic measuring and its control system.The main content of this paper is the software and hardware researching of Permanent Magnetic Synchronous Servo Motor(PMSM).
This system is designed to measure motor’s three important parameters including stator coil inductance, stalling torque and back EMF. All of these test results are used as basis for product detect. According the analysis of current test methods of the three parameters, I have found that the normal test methods can not apply for automatic measurement additionally, the automatic measuring system are usually strictly kept in secrete as know-how by motor manufacturer, so the purpose of my paper is to develop a set of automatic system to measure those three methods for product detection.This paper adopts PC and muti-fuction Data Acquisition Block (DAQ) as core controlling equipments, http://www.chinamagnets.biz and other sensors relays as secondary equipments. The software of the automatic testing system. is developed Using LabVIEW to develop the system’s working platform and software, through ADO technique, combining SQL database and Excel digital table etc applied software to develop the printing system of data management, inquiring ,forms for reporting statistics and graph curved line.The paper first introduced the background of this project, then elaborate each parameter’test method. The testing system improved the testing precision, reduced the infection of the testing people, realized the auto computer control. On the other hand, the testing system can realize the auto manage to the testing data, draw characteristic curve automatically. The system has the characteristics of simple structure, satisfied accuracy and higher reliability.
2012年10月15日星期一
Study of Dynamic Performance of Permanent Magnet Linear Synchronous Motor
Study of Dynamic Performance of Permanent Magnet Linear Synchronous Motor
Permanent magnet liner synchronous motor has been attented by more and more people,because of good dynamic performance and dependability. With applied extensively, permanent magnet liner synchronous motor is asked for dynamic performance. The main factor is thrust ripple of permanent magnet liner synchronous motor. This paper analyses the ficld and Neodymium Magnets thrust characteristic of permanent magnet liner synchronous motor by finite element analysis.According to principle and structure of permanent magnet liner synchronous motor ,this paper analyses ficld by Ansoft software. Magnetic flux, magnetic density ,gap and harmonic distribution are consisted of two results.Thrust characteristic is analysesed.Thrust curves of no-loaded and on-loaded are gained by time-stepping FEM from start to steady-state.This paper analyses thrust ripple principia, adopts Halbach array and the principle ofHalbach array. The structure and magnetized distribution of http://www.999magnet.com Halbach array are analyzed. The suited structure and magnetized distribution have been confirmed in a permanent magnet liner synchronous motor. The thrust characteristic are compared with different magnetized distributions of liner synchronous motors. The results present that the permanent magnet liner synchronous motor with Halbach array can improve the magnetized distribution, enhance the thrust of motor and reduce the thrust ripple. So Halbach array permanent magnet liner synchronous motor is prior to the normal array one.
Permanent magnet liner synchronous motor has been attented by more and more people,because of good dynamic performance and dependability. With applied extensively, permanent magnet liner synchronous motor is asked for dynamic performance. The main factor is thrust ripple of permanent magnet liner synchronous motor. This paper analyses the ficld and Neodymium Magnets thrust characteristic of permanent magnet liner synchronous motor by finite element analysis.According to principle and structure of permanent magnet liner synchronous motor ,this paper analyses ficld by Ansoft software. Magnetic flux, magnetic density ,gap and harmonic distribution are consisted of two results.Thrust characteristic is analysesed.Thrust curves of no-loaded and on-loaded are gained by time-stepping FEM from start to steady-state.This paper analyses thrust ripple principia, adopts Halbach array and the principle ofHalbach array. The structure and magnetized distribution of http://www.999magnet.com Halbach array are analyzed. The suited structure and magnetized distribution have been confirmed in a permanent magnet liner synchronous motor. The thrust characteristic are compared with different magnetized distributions of liner synchronous motors. The results present that the permanent magnet liner synchronous motor with Halbach array can improve the magnetized distribution, enhance the thrust of motor and reduce the thrust ripple. So Halbach array permanent magnet liner synchronous motor is prior to the normal array one.
Research on Automatic Measuring of Permanent Magnetic Synchronous Servo Motor
Research on Automatic Measuring of Permanent Magnetic Synchronous Servo Motor
These days, automatic measuring system has new approach for the computers a great deal application. Improving the precision and speed of motor test, carrying motor identity testing and adopting new testing method becomes feasibility because of the technique of electron developed rapidly in latter-day. In the developing background, the paper carries through the research of the motor automatic measuring and its control system.The main content of this paper is the software Alnico magnets and hardware researching of Permanent Magnetic Synchronous Servo Motor(PMSM). This system is designed to measure motor’s three important parameters including stator coil inductance, stalling torque and back EMF. All of these test results are used as basis for product detect. According the analysis of current test methods of the three parameters, I have found that the normal test methods can not apply for automatic measurement additionally, the automatic measuring system are usually strictly kept in secrete as know-how by motor manufacturer, so the purpose of my paper is to develop a set of automatic system to measure those three methods for product detection.
This paper adopts PC and muti-fuction Data Acquisition Block (DAQ) as core controlling equipments, and other sensors relays as secondary equipments. The software of the automatic testing system. is developed Using LabVIEW to develop the system’s working platform and software, through ADO technique, combining SQL database and Excel digital table etc applied software to develop the printing system of data management, inquiring ,forms http://www.999magnet.com for reporting statistics and graph curved line.The paper first introduced the background of this project, then elaborate each parameter’test method. The testing system improved the testing precision, reduced the infection of the testing people, realized the auto computer control. On the other hand, the testing system can realize the auto manage to the testing data, draw characteristic curve automatically. The system has the characteristics of simple structure, satisfied accuracy and higher reliability.
These days, automatic measuring system has new approach for the computers a great deal application. Improving the precision and speed of motor test, carrying motor identity testing and adopting new testing method becomes feasibility because of the technique of electron developed rapidly in latter-day. In the developing background, the paper carries through the research of the motor automatic measuring and its control system.The main content of this paper is the software Alnico magnets and hardware researching of Permanent Magnetic Synchronous Servo Motor(PMSM). This system is designed to measure motor’s three important parameters including stator coil inductance, stalling torque and back EMF. All of these test results are used as basis for product detect. According the analysis of current test methods of the three parameters, I have found that the normal test methods can not apply for automatic measurement additionally, the automatic measuring system are usually strictly kept in secrete as know-how by motor manufacturer, so the purpose of my paper is to develop a set of automatic system to measure those three methods for product detection.
This paper adopts PC and muti-fuction Data Acquisition Block (DAQ) as core controlling equipments, and other sensors relays as secondary equipments. The software of the automatic testing system. is developed Using LabVIEW to develop the system’s working platform and software, through ADO technique, combining SQL database and Excel digital table etc applied software to develop the printing system of data management, inquiring ,forms http://www.999magnet.com for reporting statistics and graph curved line.The paper first introduced the background of this project, then elaborate each parameter’test method. The testing system improved the testing precision, reduced the infection of the testing people, realized the auto computer control. On the other hand, the testing system can realize the auto manage to the testing data, draw characteristic curve automatically. The system has the characteristics of simple structure, satisfied accuracy and higher reliability.
2012年10月10日星期三
Research on H_∞ Control of Permanent Magnet Linear Servo System Based on Genetic Algorithm
Research on H_∞ Control of Permanent Magnet Linear Servo System Based on Genetic Algorithm
It is a gravely transform that the linear server driving technology applied to numerically controlled machine tool.The linear permanent magnet synchronous motor (PMLSM) has avoided the effects of the mechanical transmission chains from rotary motions to linear ones,and has strong electromagnetism thrust,lower cost,small electrical time constant and rapid response Block neodymium magnet etc.However,just because the linear motor is driven in direct way and have not the mechanical transmission chains,influence caused by the perturbation of system model and the disturbance of load reflect to the system directly without any buffer between them.Therefore,the strictly demands are requested to the control technology.Otherwise,with many system uncertainties considered adequately,the system should have a high robust stability and robust quality under all circumstances.
H_∞robust control method just is a control strategy that aim,at the system uncertainties and try to keep the robust stability and robust quality of system.In this paper,the large influence of load disturbances and parameter changes on PMLSM servo system was resolved by H_∞robust control strategy.After ensure the bound of load disturbances and parameter changes,choose a set of perfect weighting functions by try and error.And translate the PMLSM into the standard H_∞control problem by speed H_∞controller designed by MATLAB toolbox.Simulation conclusion indicated that under the occurrence of disturbances and parameter changes,the proposed control method has excellent tracking performance and resisting disturbances performance.However,although the http://www.chinamagnets.biz H_∞control has well robustness,the results of control depend on the choice of the weighting functions to a great extent.Due to between the weighting functions and the robustness have no material method can be followed,the improved results mostly found by the testing method.If the adjustment parameter is overfull,this testing method is difficult of carry out.Therefore,this paper put forward another method that choose the weighting functions by genetic algorithm,it will performance index to objective function and design the H_∞optimization controller.Simulation conclusion indicated that the design method is logical.
It is a gravely transform that the linear server driving technology applied to numerically controlled machine tool.The linear permanent magnet synchronous motor (PMLSM) has avoided the effects of the mechanical transmission chains from rotary motions to linear ones,and has strong electromagnetism thrust,lower cost,small electrical time constant and rapid response Block neodymium magnet etc.However,just because the linear motor is driven in direct way and have not the mechanical transmission chains,influence caused by the perturbation of system model and the disturbance of load reflect to the system directly without any buffer between them.Therefore,the strictly demands are requested to the control technology.Otherwise,with many system uncertainties considered adequately,the system should have a high robust stability and robust quality under all circumstances.
H_∞robust control method just is a control strategy that aim,at the system uncertainties and try to keep the robust stability and robust quality of system.In this paper,the large influence of load disturbances and parameter changes on PMLSM servo system was resolved by H_∞robust control strategy.After ensure the bound of load disturbances and parameter changes,choose a set of perfect weighting functions by try and error.And translate the PMLSM into the standard H_∞control problem by speed H_∞controller designed by MATLAB toolbox.Simulation conclusion indicated that under the occurrence of disturbances and parameter changes,the proposed control method has excellent tracking performance and resisting disturbances performance.However,although the http://www.chinamagnets.biz H_∞control has well robustness,the results of control depend on the choice of the weighting functions to a great extent.Due to between the weighting functions and the robustness have no material method can be followed,the improved results mostly found by the testing method.If the adjustment parameter is overfull,this testing method is difficult of carry out.Therefore,this paper put forward another method that choose the weighting functions by genetic algorithm,it will performance index to objective function and design the H_∞optimization controller.Simulation conclusion indicated that the design method is logical.
Research and Application of Permanent-magnet Synchronous Motors for Pumping Unit
Research and Application of Permanent-magnet Synchronous Motors for Pumping Unit
It is the important item which is paid close attention to by every Oilfield, increasing the systemic efficiency of mechanized adopt oil, reducing the consume of energy of oil pumping unit. The factor influnencing oil pumping unit system efficiency is in many ways, electromotor efficency is one of them.In order to resolve the problem of the present running condition Ball Neodymium Magnets of low power utilization、low efficiency、low power factor of electromotor of oil pumping unit present and small start up torsion、small light load efficiency、low power factor of synchromotor etc. in Shengli oil-field, we adopt high-performance Nd、Fe、B material,anti-magnet to tense key structure magnetic pole and a hot separate set of anti-magnet steel material. By technique improvement and structure innovation we develop a new generation special permanent magnet synchromotor of oil pumping unit to adapt the oil pumping unit work condition and that have obtained higher enegy ability index and start up capability,preveted heat demagnetization and electricity demagnetization of electromotor. According to laboratory test and field test,it is desmonstrated that the electromotor has many http://www.chinamagnets.biz useful capabilities,such as higher qulity factors of startup,wider using-areas of pressure,and adapting wide-range load change of oil pumping unit. Comparing with Y-catena electromotor,the using rate of electromotor’s power、power factor、electromotor’s efficiency is clear superiority. The permanent magnet synchromotor of oil pumping unit can not only low the running fee-for-electricity of oil pumping unit significantly、line loss of oil pumping unit systemic efficiency, but also reduce investment of compensates capacitor. The electromotors have achived good results used in oil pumping unit, and have vast of expansion space.
It is the important item which is paid close attention to by every Oilfield, increasing the systemic efficiency of mechanized adopt oil, reducing the consume of energy of oil pumping unit. The factor influnencing oil pumping unit system efficiency is in many ways, electromotor efficency is one of them.In order to resolve the problem of the present running condition Ball Neodymium Magnets of low power utilization、low efficiency、low power factor of electromotor of oil pumping unit present and small start up torsion、small light load efficiency、low power factor of synchromotor etc. in Shengli oil-field, we adopt high-performance Nd、Fe、B material,anti-magnet to tense key structure magnetic pole and a hot separate set of anti-magnet steel material. By technique improvement and structure innovation we develop a new generation special permanent magnet synchromotor of oil pumping unit to adapt the oil pumping unit work condition and that have obtained higher enegy ability index and start up capability,preveted heat demagnetization and electricity demagnetization of electromotor. According to laboratory test and field test,it is desmonstrated that the electromotor has many http://www.chinamagnets.biz useful capabilities,such as higher qulity factors of startup,wider using-areas of pressure,and adapting wide-range load change of oil pumping unit. Comparing with Y-catena electromotor,the using rate of electromotor’s power、power factor、electromotor’s efficiency is clear superiority. The permanent magnet synchromotor of oil pumping unit can not only low the running fee-for-electricity of oil pumping unit significantly、line loss of oil pumping unit systemic efficiency, but also reduce investment of compensates capacitor. The electromotors have achived good results used in oil pumping unit, and have vast of expansion space.
Sensorless Vector Control Research and Simulation of Permanent Magnet Synchronous Motor
Sensorless Vector Control Research and Simulation of Permanent Magnet Synchronous Motor
The motion control of PMSM needs precise rotor magnetic pole position. Traditional method is using mechanical sensors to detect magnetic motor speed and location, but it has some problems such as: high cost, low reliability and poor adaptive capacity with adverse neodymium magnets environment. Therefore, the research of a reliable, low-cost control method without mechanical sensors has become a hotspot in the field of motor control technology.Model Reference Adaptive System is a method based on fundamental excitation to estimate the rotor speed and position. It does well in usual and high speed control. The method based on fluctuating high frequency voltage signal injection is using the magnetic saturation of PMSM to estimate the rotor speed and position. It does well in low speed control.
Based on the study of these two methods, the paper mainly completed the following works:An improved MRAS based on online rotor resistance identification is introduced. This model can estimate the rotor speed、position and resistance well, and it has good robust ability to adapt the change of rotor resistance. Basically, the estimation accuracy can satisfy the request of vector control system. It has good static and dynamic performance in usual and high speed control.Based on the improved MRAS and the vector control method which is based on id=0, a http://www.chinamagnets.biz simplified MRAS is introduced. It has simple structure、small amount of calculation and good dynamic performance. The simulation results show the feasibility of the method. The simplified MRAS and the improved MRAS can be chosen with different request.To solve the limitation of MRAS in low speed control, the method based on fluctuating high frequency voltage signal injection is introduced which is particularly applicable to low speed control. By the weighted algorithm, these two methods are switched smoothly. This composite method is not only does well in low speed control but also in usual and high speed control. The simulation results show the feasibility of the composite method.
The motion control of PMSM needs precise rotor magnetic pole position. Traditional method is using mechanical sensors to detect magnetic motor speed and location, but it has some problems such as: high cost, low reliability and poor adaptive capacity with adverse neodymium magnets environment. Therefore, the research of a reliable, low-cost control method without mechanical sensors has become a hotspot in the field of motor control technology.Model Reference Adaptive System is a method based on fundamental excitation to estimate the rotor speed and position. It does well in usual and high speed control. The method based on fluctuating high frequency voltage signal injection is using the magnetic saturation of PMSM to estimate the rotor speed and position. It does well in low speed control.
Based on the study of these two methods, the paper mainly completed the following works:An improved MRAS based on online rotor resistance identification is introduced. This model can estimate the rotor speed、position and resistance well, and it has good robust ability to adapt the change of rotor resistance. Basically, the estimation accuracy can satisfy the request of vector control system. It has good static and dynamic performance in usual and high speed control.Based on the improved MRAS and the vector control method which is based on id=0, a http://www.chinamagnets.biz simplified MRAS is introduced. It has simple structure、small amount of calculation and good dynamic performance. The simulation results show the feasibility of the method. The simplified MRAS and the improved MRAS can be chosen with different request.To solve the limitation of MRAS in low speed control, the method based on fluctuating high frequency voltage signal injection is introduced which is particularly applicable to low speed control. By the weighted algorithm, these two methods are switched smoothly. This composite method is not only does well in low speed control but also in usual and high speed control. The simulation results show the feasibility of the composite method.
2012年10月8日星期一
Research on the Digital Servo System for the Permanent Magnet Synchronous Motor
Research on the Digital Servo System for the Permanent Magnet Synchronous Motor
High performance AC servo systems, widely used in various areas, are demanded with the development of modern industrialization. AC servo systems have advantages over DC servo systems, so it is very important to develop high performance and high neodymium magnets reliability AC servo control systems.In this paper, the control method of the permanent magnet synchronous motor(PMSM) and its mathematic model are fully studied. The working principles of PMSM and close-loop control methods of PMSM current、speed and position are detailly discussed based on the PMSM mathematical models in the different reference frames. Then the position servo system is simulated by MATLAB/SIMULINK. The control method is proved correct by the simulation result. http://www.chinamagnets.biz Moreover the thesis presents a high-frequency signal injection method to observe rotor position based on Permanent Magnet Synchronous Motor models. The simulation results show it is adjusting and effective to estimate rotor position.It’s proved successful on PMSM’s servo control based on the Digital Signal Processor(DSP) chip TMS320F2812, including current、speed and position control. The experimental results prove that this servo system has very wide range of regulating speed and has good dynamic and static behaviors .Moreover some functions of servo system are accomplished. So, the servo system can meet the demand of high control performance.
High performance AC servo systems, widely used in various areas, are demanded with the development of modern industrialization. AC servo systems have advantages over DC servo systems, so it is very important to develop high performance and high neodymium magnets reliability AC servo control systems.In this paper, the control method of the permanent magnet synchronous motor(PMSM) and its mathematic model are fully studied. The working principles of PMSM and close-loop control methods of PMSM current、speed and position are detailly discussed based on the PMSM mathematical models in the different reference frames. Then the position servo system is simulated by MATLAB/SIMULINK. The control method is proved correct by the simulation result. http://www.chinamagnets.biz Moreover the thesis presents a high-frequency signal injection method to observe rotor position based on Permanent Magnet Synchronous Motor models. The simulation results show it is adjusting and effective to estimate rotor position.It’s proved successful on PMSM’s servo control based on the Digital Signal Processor(DSP) chip TMS320F2812, including current、speed and position control. The experimental results prove that this servo system has very wide range of regulating speed and has good dynamic and static behaviors .Moreover some functions of servo system are accomplished. So, the servo system can meet the demand of high control performance.
3-phase AC Permanent Magnet Synchronous Motor’s Control of PIC
3-phase AC Permanent Magnet Synchronous Motor’s Control of PIC
In this paper, we take PMSM which has an optical encoder as a control object, and design the hardware & software of the system of PMSM. Servo system is a motion control system which has the property of digital, high performance. Based on IRMCK201, neodymium magnets could implement the digital control successfully.The hardware system takes PIC16F877 as a processor, power circuit takes IRAMS10UP60A as a core and uses HCPL2631 to isolate the PWM output signal. As a core chip of control circuit, IRMCK201 can implement speed and current control by optical encoder circuit and current check circuit. The protective circuit could implement the function of over-current protection and over-temperature protection. The design of whole hardware system takes many EMC measures, which can enhance the reliability.The software system is made up http://www.chinamagnets.biz of main program, ISR. Main program implements the function of the initialization IRMCK201, interruption, every sub-module. ISR implements the over-current protection by cut down PWM output.
In this paper, we take PMSM which has an optical encoder as a control object, and design the hardware & software of the system of PMSM. Servo system is a motion control system which has the property of digital, high performance. Based on IRMCK201, neodymium magnets could implement the digital control successfully.The hardware system takes PIC16F877 as a processor, power circuit takes IRAMS10UP60A as a core and uses HCPL2631 to isolate the PWM output signal. As a core chip of control circuit, IRMCK201 can implement speed and current control by optical encoder circuit and current check circuit. The protective circuit could implement the function of over-current protection and over-temperature protection. The design of whole hardware system takes many EMC measures, which can enhance the reliability.The software system is made up http://www.chinamagnets.biz of main program, ISR. Main program implements the function of the initialization IRMCK201, interruption, every sub-module. ISR implements the over-current protection by cut down PWM output.
Magnetic Field Analysis of Sectional Form Modular Direct Drives Type Permanent Magnet Synchronous Wind Generator
Magnetic Field Analysis of Sectional Form Modular Direct Drives Type Permanent Magnet Synchronous Wind Generator
Wind power is one of the cleanest energy source, and wind energy generation is the most economical form of the tapping the wind energy on a large scale. In this thesis, the development of wind energy generation in our country and abroad is summarized first, neodymium magnets and the prospect of wind energy generation in our country is introduced. On the basis of the summary for the development of wind energy generation, the actuality and the development of wind generation technology are introduced in brief.The paper proposes a new type of modular stator structure three-phase direct drives type permanent magnet synchronous wind generator, which offers a number of significant advantages over conventional direct drives type permanent magnet synchronous wind generator.
In the generator, there are k1 sector combinations, and each sector combination has three phases. Each phases has one modular stator which has k2 toothes.The electrical machine’s structure and the principle is introduced .The machine equipped with the concentrated winding and the number of pole-pairs can be very much. The winding is continuously coiled in stator core. The end winding is minimal and the axis length of machine is smaller, so the stator core is easy to transport, fixing and repair. The relation between structure parameter and pole number is discussed. It is also http://www.chinamagnets.biz approved that only the 3rd and triple cogging torque is existed and the others are eliminated. The magnetic distribution and the induced electromotive force of the generator, which is equipped with surface-mounted magnet rotor, is analyzed by finite element technique(FET) and calculative result proved that phased inductive electromotive force of three-phase stator winding is trapezoid wave, and the flat top part of trapezoid wave approaches to 2π/3 electrical angle, is fit for the communication load which has large inductor filter.
Wind power is one of the cleanest energy source, and wind energy generation is the most economical form of the tapping the wind energy on a large scale. In this thesis, the development of wind energy generation in our country and abroad is summarized first, neodymium magnets and the prospect of wind energy generation in our country is introduced. On the basis of the summary for the development of wind energy generation, the actuality and the development of wind generation technology are introduced in brief.The paper proposes a new type of modular stator structure three-phase direct drives type permanent magnet synchronous wind generator, which offers a number of significant advantages over conventional direct drives type permanent magnet synchronous wind generator.
In the generator, there are k1 sector combinations, and each sector combination has three phases. Each phases has one modular stator which has k2 toothes.The electrical machine’s structure and the principle is introduced .The machine equipped with the concentrated winding and the number of pole-pairs can be very much. The winding is continuously coiled in stator core. The end winding is minimal and the axis length of machine is smaller, so the stator core is easy to transport, fixing and repair. The relation between structure parameter and pole number is discussed. It is also http://www.chinamagnets.biz approved that only the 3rd and triple cogging torque is existed and the others are eliminated. The magnetic distribution and the induced electromotive force of the generator, which is equipped with surface-mounted magnet rotor, is analyzed by finite element technique(FET) and calculative result proved that phased inductive electromotive force of three-phase stator winding is trapezoid wave, and the flat top part of trapezoid wave approaches to 2π/3 electrical angle, is fit for the communication load which has large inductor filter.
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