鼠笼异步电机在一相反接运行下的计算机仿真

研究鼠笼异步电机在一相反接下的运行情况，建立了电机运行的数学仿真模型和电压型逆变器的供电模型，并给出仿真实例。     

基于三相逆变器的两相混合式步进电机伺服系统

文章研究了应用三相桥式电压型逆变器驱动两相混合式步进电机实现位置跟踪,详细阐明了该拓扑结构驱动下的利用SVPWM控制策略实现步进电机的微步控制,并推导出各扇区参数的确定公式及约束条件。最后通过Matlab/Simulink进行仿真,仿真结果证明了三相桥式电压型逆变器驱动两相混合式步进电机的可行性,显示了基于三相逆变器的微步控制伺服系统的高性能。     

SVPWM控制技术在两相异步电动机中的应用

研究了两相逆变器供电异步电动机系统的SVPWM控制技术,该系统可广泛应用于小功率、宽调速范围运行的场合。推导并建立了两相异步电动机的数学模型,分析了两相逆变器驱动两相异步电动机的工作原理和空间矢量的时间分配原则。以一台小功率两相异步电动机为对象,进行了系统仿真,给出该电机采用SVPWM方式控制运行时的仿真波形。     

PWM逆变器供电下电机铁心损耗的解析计算

在Bertotti分立铁耗计算模型的基础上，采用贝赛耳函数，推导PWM逆变器供电下硅钢片损耗的计算模型，该模型考虑逆变器参数对材料损耗的影响，建立PWM供电与标准正弦供电时材料损耗之间的数量关系，为电工材料性能的研究提供了理论依据。通过改进的爱泼斯坦方圈实验，给出一种非正弦供电下电工材料性能的实验研究方法，实验结果与理论值吻合较好。采用PWM逆变器供电时的三相异步电动机进行样机实验，结果表明，该计算模型对PWM供电下电机铁心损耗的理论计算具有很好的工程应用价值。     

用电压型逆变器供电的同步电动机仿真

一、概述在这篇论文中,本人模拟了用电压型逆变器供电的同步电动机的稳态运行。电机工作在额定过励状态,即设定子电流超前于定子电压(φ<0)。本文首先简单叙述了电机的数学模型。然后分析计算了电压型逆变器电路,介绍了程序计算框图及计算公式。所编程序采用FORTRAN77语言,其中使用龙格-库塔法     

电压型逆变器供电的异步电动机转矩的分析与计算

由于电压型逆变器输出的电压和电流波形中含有大量谐波,使异步电动机低速时的转矩脉动,转速波动。文中采用频域法推导了PWM型逆变器供电时,异步电动机转矩的计算公式,并就其中的恒定转矩和谐波转矩分量进行了分析,对一台2．2KW,SPWM电压源逆变器供电的三相异步发动机低频稳态时的转矩计算和实验结果进行了比较,结果较接近,在已矩逆变器输出电压波形和电机参烤的情况下,利用本方法计算电机输出转矩,方法简单实用。     

基于网络图论的逆变器供电感应电动机调速系统通用仿真算法

本文提出了一种基于网络图论的逆变器供电感应电动机调速系统通用仿真算法。感应电动机采用定子量保留在ＡＢＣ系统，转子量折算到αβ０系统的混合模型，既消除了电机电感矩阵中的时变量，又可与逆变器与电路直接结合，采用网络图论分析方法，把包括逆变器和电机在内的整个调速系统主电路作为一个拓扑图来处理，得到的仿真模型能对逆变器和电机两部分电路同时求解，该模型对任何电路结构形式，任意开关模式的逆变器供电感应电动机调     

逆变器供电下异步电动机定子断相故障运行过程仿真

根据三相异步电动机在αβo坐标系下的数学模型和电压型逆变器的数学模型,用MATLAB语言编写仿真程序。通过实例对三相异步电动机定子断相故障的运行过程进行仿真计算,并对仿真结果进行分析。     

驱动二相交流电动机变频调速的电压型逆变器

介绍一种可用于驱动二相交流电动机作变频调速运行的电压型逆变器。给出了逆变器的结构和控制电路的组成,分析了逆变器的运行原理,最后以一个逆变器——电机系统为例,给出主要的系统参数和运行结果。     

逆变器供电下下异步电动机定子断相故障运行过程仿真

根据三相异步电动机在αβο坐标系下的数学模型和电压型逆变器的数学模型，用MTLAB语言编写仿真程序，通过实例对三相异步电动机定子断相故障的运行过程进行仿真计算，并对仿真结果进行分析。     

五相星接电压型逆变器的工作

本文对绕组星形连接的五相混合式步进电动机系统之电压型逆变器在低速和中速下的工作进行分析。首先依据逆变器的拓扑说明其工作过程,然后进行相电流、相电压及逆变器直流侧电流分析,最后导出电磁转矩表达式。全部分析工作为高性能驱动系统的合理设计提供了理论依据。     

异步电机矢量控制中死区效应补偿技术的研究

针对异步电机矢量控制系统中电压源型三相逆变器死区效应进行了理论分析,提出了一种基于电压空间矢量调制（SVPWM）控制的死区补偿方法。它无需增加硬件电路,只需对软件进行修改即可实现,且计算量小。易于工程实现。结合TMS320F240DSP控制芯片,在1．1kW异步电机上进行了补偿前后的实验,实验结果验证了该死区补偿方法的有效性。     

Micro-stepping control of a two-phase linear stepping motor with three-phase VSI inverter for high-speed applications

This paper presents a synchronous frame current control scheme for micro-stepping a two-phase linear stepping motor drive using a three-phase voltage-source inverter. Because of the wide operating frequency, the frequency-dependent voltages are decoupled from the controller to reduce the current-following errors and preserve the dynamic characteristics as the frequency varies. A motor cogging force compensation scheme performed in the synchronous frame is proposed to reduce the positioning error and velocity ripple caused by the cogging force. A space-vector pulse width modulation scheme is used for motor voltage modulation. This scheme is based on the harmonic injection principle originally derived for three-phase motor drives. Good static and dynamic performance is obtained in the experimental verifications.     

基于DSP的异步电机控制系统的死区补偿研究

针对异步电动机矢量控制系统中电压型三相逆变器的死区效应,结合空间矢量图,提出了一种根据电流矢量所在的扇区判断电流极性的死区补偿方法,这种方法通过软件实现且不需要任何硬件。结合TMS320F2812DSP芯片实现补偿算法,并在3．3kW异步电机矢量控制系统中验证了该算法的有效性。     

无共模电压SVPWM多桥臂逆变器的拓扑结构演化与电机性能研究

三相开放式绕组永磁同步电动机(PMSM)可采用单电源双逆变器供电,与传统单逆变器供电的PMSM相比具有可选电压矢量多及控制方法灵活等优点,有利于改善电机驱动性能,但逆变器桥臂数量较多,硬件结构复杂。为此,针对无共模电压空间矢量脉宽调制(SVPWM)控制方法,对单电源双逆变器(即六桥臂)驱动拓扑结构进行演化,逐步减少桥臂数量,并对比分析各演化结构驱动下的电机性能。各演化结构虽然引入了额外的零序电流通路,但在无共模电压SVPWM控制下没有零序电压激励,因此并无零序电流产生,故拓扑结构的演化并不影响电机控制性能。该拓扑结构演化不仅为逆变器与电机绕组的选型设计提供参考,还揭示了无共模电压SVPWM的本质特性。     

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。     

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.     

Real-Time Testing of WPT-Based Protection of Three-Phase VS PWM Inverter-Fed Motors

This paper presents an experimental testing of a wavelet packet transform (WPT)-based technique for protecting and controlling three-phase voltage-source (VS) pulse-width modulated (PWM) inverters under extreme load conditions. The proposed technique is based on a two-level multiresolution analysis (MRA) applied on output currents of a 3Phi VS PWM inverter. The MRA aims to extract certain signatures, which are the second level highest frequency subband coefficients. These coefficients take a nonzero value for any signal that is short-duration, nonperiodic and nonstationary with impulse-super imposed high frequencies. Such a signal perfectly matches a current arising from any typical fault occurring in either the inverter legs or on the load side. The proposed technique is realized using a -code hosted and executed by a dSPACE ds1102 controller board. The tested inverter supplies loads that include a 3Phi Y-connected R - L load, a 3Phi squirrel-cage induction motor and a 3Phi synchronous reluctance motor. The extreme load conditions include inverter open-leg, motor starting currents and different faults in motor stator windings. The experimental test results show accurate, fast, and effective response to all disturbances including fault currents by the proposed WPT-based technique.     

A PI-type dead-time compensation method for vector-controlled GTOinverters

In the case of voltage-source gate-turn-off thyristor (GTO) inverters, the conventional dead-time compensation methods do not work well, since the terminal voltage of an inverter leg is not constant during the dead-time period, due to the presence of the snubber circuit. We propose a closed-loop dead-time compensation method that regulates the voltage error by a proportional-integral (PI)-type compensator. We show its superior performance by the reduction in current ripple and in the sixth harmonic component of the motor current in the synchronous frame     

An approach to real-time position estimation at zero and low speedfor a PM motor based on saliency

This paper presents a magnetic saliency-based position estimation approach for a permanent magnet (PM) motor fed by a voltage-source pulse width modulation (PWM) inverter. The proposed real-time estimation algorithm detects motor current harmonics and calculates the inductance matrix, including rotor position information. Position estimation can be performed every period of PWM or carrier cycle. An experimental system using an interior permanent magnet (IPM) synchronous motor has been constructed. Experimental results verify that position estimation within 10° in electrical angle is obtained at standstill and at speeds as low as 1 r/min by the proposed approach