基于MATLAB的异步电机VVVF调速系统仿真.docVIP

摘　要: 随着电力电子技术的发展，异步电机以其在变频调速方面的优点开始显现出来了，相对于直流电机有更加广泛的应用 本论文主要介绍了异步电机的工作原理以及异步电机的调速方法。通过改变频率、改变电源电压、改变极对数等方法来改变电机的转速，我是通过改变电机频率来达到改变电机转速的目的，本文还介绍了变频器的原理和PWM（pulse width modulation） Abstract: With the development of power electronics, the advantage of the variable frequency speed in asynchronous machine is compared with the DC motor , it is more widely used. The principle of asynchronous machine and its way of speed governing is main discussed in this paper. The speed of electrical motor is changed by changing frequency voltage, and numbers of pole-p[airs. This paper is based on changing frequency of the electrical motor, the principle of frequency converter and working theory about PWM(pulse width modulation)is also presented. The open-loop and closed-loop simulation of speed governing with asynchronous machine is achieved through the use of Matlab/simulink system. The observation to electrical motor speed and torque in this paper is the open-loop system, in a closed-loop system, Matlab/simulink is used to design and similated the closed-loop system speed changing is realized, the changing plot of speed and torque about the electrical motor and observed the changing image of torque and the speed about the electrical motor, is observed. the reason why asynchronous machine speed changes and parameters a selection of call the component during the simulation are analyzed. Understanding of the principle of the induction motor and speed control methods, there are three main methods Speed: (1) changing the frequency, (2) change to slip (3) changes the very few. This paper has taken to change the frequency of the ways to achieve the purpose of speed. At the same time also understand the principle of the inverter, and its scope of application. Key words Matlab asynchronous machine Frequency Control Simulation 目 录 第一章 绪 论 1 第一节 电气传动技术的发展概况 1 第二节 普通交流异步电动机变频调速调速范围的问题 2 第三节 交流异步电动机的调速方式 3 一、 转子回路串电阻或阻抗调速 3 二、 定子调压调速 3 三、 串级调速 4 四、 变极调速 4 五、 变频调速 4 第四节 关于ma