Line-start permanent-magnet motor: single-phase starting performance analysis

This paper presents a detailed quasi-steady-state approach to different torque components (average and pulsating) for a single-phase capacitor-run permanent-magnet (PM) motor. By employing average electromagnetic torque, and the expected envelope of the pulsating torque, an accurate prediction of starting torque components behavior is made. The quasi-steady-state analysis of the asynchronous performance of the single-phase capacitor-start capacitor-run PM motor is realized through a combination of symmetrical components and d-q axes theory. The developed approach is valid for any m-phase AC motor-induction, synchronous reluctance, or synchronous PM.     

永磁自起动电动机转子结构与起动性能相关性分析

针对不同转子结构下电动机的起动性能不同,建立了二维电磁场数值计算模型,确立了不同转子结构下的电磁场求解域,利用有限元法对电动机启动过程中的瞬态电磁场进行了数值计算,分析研究了电动机的不同起动性能参数。指出了不同永磁转子结构下的自起动电动机的性能特点以及转子结构和起动性能间的相互关系。为今后类似永磁电动机的设计提供了理论依据。     

Nonlinear control of interior permanent-magnet synchronous motor

This paper presents a novel speed control technique for an interior permanent-magnet synchronous motor (IPMSM) drive based on newly developed adaptive backstepping technique. The proposed stabilizing feedback law for the IPMSM drive is shown to be globally asymptotically stable in the context of Lyapunov theory. The adaptive backstepping technique takes system nonlinearities into account in the control system design stage. The detailed derivations of the control laws have been given for controller design. The complete IPMSM drive incorporating the proposed backstepping control technique has been successfully implemented in real-time using digital signal processor board DS1102 for a laboratory 1-hp motor. The performance of the proposed drive is investigated both in experiment and simulation at different operating conditions. It is found that the proposed control technique provides a good speed tracking performance for the IPMSM drive ensuring the global stability.     

Application of the vector-pulse method to starting an alternating-current motor

A soft-start method for induction and synchronous motors is considered. The method is based on pulse switching of the motor stator to the supply network at the moments at which the stator- and rotor-flux linkage vectors produce positive electromagnetic torque. A wiring diagram of the experimental soft-start device, its operation algorithm, and experimental outcomes are presented.     

三相异步起动永磁同步电动机起动特性

针对永磁电机牵入同步困难的问题,依据永磁电机基本原理和电磁场理论,对异步起动永磁同步电动机的起动性能进行了研究。以一台18．5kW6极切向式三相异步起动永磁同步电动机为例,建立永磁电动机起动过程的数学模型,给出了求解域和假定条件下的有限元方程,采用场路结合法计算了异步起动永磁同步电动机的瞬态电磁场,分析了样机的起动过程及隔磁磁桥尺寸变化和绕组排列不同对电机起动性能的影响。通过样机对模型仿真分析可知,样机具有较好的起动性能,能快速牵入同步转速,采用单双层绕组时起动性能要比采用双层绕组时的起动性能好;隔磁磁桥尺寸对电机的起动性能影响很大,其过大或过小都会使起动性能变差,不利于牵入同步转速。     

用于驱动无刷直流电机的矩阵变换器控制策略

利用矩阵变换器驱动无刷直流电机,可以实现无刷直流电机的交一交直接控制.针对无刷直流电机反电势为梯形波、相电流为方波的特点,提出一种用于驱动无刷直流电机的矩阵变换器的控制策略.将矩阵变换器等效为整流器和逆变器的虚拟连接,分别对这两个虚拟环节采用输入电流空间矢量调制和三相六拍120°持续导通模式,然后将两个环节的调制策略相结合,从而实现无刷直流电机交-交变频调速.该控制策略能够实现输出方波电流的同时实现输入电流的正弦化.对给出的控制策略进行了详细的理论分析与推导.实验验证了控制策略的正确性与可行性.     

Modeling, simulation, and analysis of permanent-magnet motordrives. I. The permanent-magnet synchronous motor drive

The application of vector control to the PMSM (permanent-magnet synchronous motor) is described, and complete modeling, simulation, and analysis of the drive system are presented. State-space models of the motor and speed controller and real-time models of the inverter switches and vector controller are included. Performance differences due to the use of pulsewidth-modulation (PWM) and hysteresis current controllers are also examined. Particular attention is paid to the motor torque pulsations and speed response. Some experimental verification of the drive performance is also given     

电动机软起动学科

给出了电动机软起动学科的定义 ,提出该学科的研究对象及研究方法 ,介绍了我国软起动学科的研究现状 ,并指出了软起动学科有待进一步研究和解决的问题     

单相永磁同步电动机脉振转矩的分析和计算

利用F－B－O坐标系统下单相永磁同步电动机异步稳态运行的数学模型,推导出任何转差率下的电磁转矩表达式。结合状态空间数学模型,对起动过程中的脉振转矩进行了分析和计算。     

磁通切换永磁电机等效模型与控制策略分析

针对传统转子永磁型电机散热困难导致永磁体发生不可逆退磁、限制电机出力、减少功率密度等问题,提出了一种定子永磁型磁通切换永磁(FSPM)电机,并对该电机结构特点与等效模型进行了分析,比较了定子磁场定向控制(SFOC)、直接转矩控制(DTC)及基于空间矢量调制的直接转矩控制(SVM-DTC)三种控制方法在FSPM电机上的应用效果.运用dSPACE的实验平台,对基于SFOC的FSPM电机驱动系统进行了实验研究.仿真与实验结果表明,采用SFOC的FSPM电机转矩脉动小、电流正弦度好以及低速性能优越,更适合于低速驱动领域的应用.     

Evaluation of saturation and cross-magnetization effects in interior permanent-magnet synchronous motor

This paper presents the evaluation of saturation and cross-magnetization effects in an interior permanent magnet synchronous motor (IPMSM) over the entire range of direct- and quadrature-axis excitations. The conventional two-axis machine model is modified in order to include the influence of saturation and cross-coupling effects on the variation of self- and cross-coupling inductances in the direct and the quadrature axis. The two-axis machine model parameters are evaluated by experiments performed on an IPMSM using a controlled voltage-source inverter and are compared with parameter values evaluated by the finite-element method. The evaluation of two-axis machine model parameters reveals significant saturation and cross-magnetization effects in both axes, especially in the flux-weakening regime.     

Sensorless initial rotor position estimation of surface permanent-magnet synchronous motor

This paper presents a method of estimating the initial rotor position of a surface permanent-magnet synchronous motor without a position sensor. The estimation is performed by using the nonlinear magnetization characteristics of the stator core caused by the magnet of the rotor. This method is based on the principle that the d-axis current value for the voltage vector applied to the motor under some conditions increases as the voltage vector generated from the inverter approaches the N pole of the rotor. During the estimation process, the rotor is practically at standstill. The experimental results show that the average of the estimation error is /spl plusmn/3.8 electrical degrees.     

基于Ansoft的永磁同步磁阻电机建模与仿真

采用Ansoft公司的maxwell 2D模型建立永磁同步磁阻电机模型,构建一个完整的仿真系统.通过对PMa_SynRM模型的有限元分析,得出反电势曲线,以及转子位置变化对应的转矩与磁场的分布情况,并得到最大转矩下弱磁控制角度,仿真结果为PMa_SynRM的优化设计及进一步研究提供了理论依据.     

绕线式异步电动机的无触点起动

介绍了绕线式异步电动机无触点起动的新方法 ,该方法最大的特点是用晶闸管代替了接触器 ,去掉了控制电路中的继电器     

Mass reduction and propulsion control for a permanent-magnet linearsynchronous motor vehicle

This paper deals with fundamental research on a new container transport system utilizing a permanent-magnet (PM) linear synchronous motor (LSM), and proposes a concept of mass reduction and propulsion control for container transfer operation. By applying the repulsive lift force in the PM LSM, a large percent of vehicle weight is compensated for, and it needs less thrust force to propel the vehicle. An experiment which involved propelling the test vehicle by reducing its weight by about 85% was conducted successfully     

Analysis of the magnetic field in a permanent-magnet motor,carried out by the finite element method

Contents An analysis has been made of the magnetic field in a permanent-magnet motor by applying the finite element method, using an adequate functional. The results obtained may be applied for analyzing the magnetic field in similar motors of a different design.

---

Analyse des magnetischen Feldes einer elektrischen Maschine mit permanenten Magneten mittels der Methode der finiten Elemente

Übersicht Es wird die Analyse des magnetischen Feldes einer elektrischen Maschine mit permanenten Magneten dargestellt und erläutert. Dabei wird die Methode der finiten Elemente benutzt, und zwar bei Verwendung des entsprechenden Funktionals. Die Resultate können für die analyse des magnetischen Feldes anderer ähnlicher Maschinen Anwendung finden.

     

无速度传感器的永磁同步电动机直接转矩控制

针对电机驱动系统安装传感器带来的成本高、可靠性低、维护困难等问题,在叙述永磁同步电动机直接转矩控制原理的基础上,采用基于转子磁链位置的方法采估算电机转速,并在MATLAB SIMULINK下建立系统的仿真模型.仿真结果验证了该无速度传感器估算方案在电机全速范围内都能较好地估计电机真实转速,并且具有良好的动静态性能.     

A study on driving characteristics of the cross type ultrasonic rotary motor

Ultrasonic rotary motor which has cross type stator was studied. The stator was consists of hollowed cross type metal which has four piezoelectric ceramics on the ends of cross bars. When two harmonic voltages which have 90^∘ phase difference were applied to ceramics, the symmetric and anti-symmetric displacements were generated at the inside tips to make the elliptical motion. The finite element analysis was used for optimizing the dimension and displacement of the stator. And the analyzed results were compared with the experimental results of the motor. As results, the speed of motors could be controlled by changing the applied voltages, and the rotational direction of motors could be changed by the phase change. Speed and torque of the motors were increased by increasing the width of cross bars, and the torque and displacement was increased by increasing angle of the cross bars.