Abstract : the phenomenon of light and heavy steps in 5 - phase hybrid stepping motors is investigated . focusing on the relationships between phase - current and phase - voltage caused by different switching modes , a proposal to improve the light and heavy steps under3 - 4 phase mode is presented and the well - agreed experimental results are given 文摘:研究了五相混合式步进电动机4 5相通电运行时的轻重步现象，通过分析不同通电方式时导通与截止相的相电压变化对相电流的影响，阐明了3 4相通电方式可以改善电机轻重步现象的机理，并进行了实验验证。
Computation method based on fast fourier transformation ( fft ) is studied deeply , whose measurement accuracy is 0 . 2s . the computing indexes involve voltage , current , power , frequency , phase , electric power , the harmonic ratio and the total harmonic distortion ( thd ) of phase voltage and phase current 深入研究了测量精度为0 . 2s级的基于快速傅立叶变换( fft )的电压、电流、功率、频率、相位、电能等电力参数和各相电压电流各次谐波含量、谐波含有率、谐波总畸变率的计算方法。
Based on analyzing the math model and running character of motor , this paper educes a method of estimating the real torque of motor by a way of energy conversion . by measuring the stator ' s current , voltage and the power factor of the motor , we can calculate the input power of the motor , and then we can get the electromagnetism power and the real electromagnetism torque 本文在分析了电机的数学模型和电机运行特点的基础上，通过测量电动机定子相电压和定子相电流以及功率因数角的方法，得出电动机的输入功率，并从电机能量转换的基础上，得到电机的电磁功率，由此得到电机的实际电磁转矩。
The dissertation work , covering the methodology study , controller design , prototype implementation and experiment , is presented as following : based on the relations between the voltages and currents in accordance with the states of the rectifier topology , the switching function model was first established and then simulated by carefully designed matlab programs ; the controller ' s hardware was designed around the ti ' s f240 processor and corresponding software was also designed to integrate with the hardware to realize a dual - loop vsr control system 论文主要内容包括算法研究、控制器设计、装置开发、样机实验。论文过程中，首先根据三相电压源型pwm整流器各相电压电流之间的关系和桥路的工作状态建立开关仿真模型，并在模型基础上利用matlab软件对电压源型pwm整流器及其控制系统进行仿真设计。其次为实现电压源型pwm整流器双闭环控制系统提供软硬件设计方案。
This software has realized functions of the sampling of stator phase current , calculating of the phase voltage , the observing of stator flux and the output of switching signal etc . according to the analysis of the theory of dtc scheme and the design of the control software , the author of this paper has done the primary experiments of the open - loop hexagon flux control system using the dsp test - bed for experimentation and development of motor control F240内部的外设模块为电机控制提供的硬件功能，使软件编程的工作得到大大的简化，它的实时运算能力大大提高了电机的控制性能和可靠性。在本文中采用dsp汇编语言完成了有速度传感器的直接转矩控制系统的软件编写，实现了定子相电流采样、相电压的计算、定子磁链的观测、开关信号输出等功能。
