文档介绍：摘要
现代电力电子技术及计算机控制技术的迅速发展,促进了电气传动的技术革命。交流调速取代直流调速,计算机数字控制取代模拟控制己成为发展趋势。交流电机调速是当今节约电能、改善生产工艺流程、提高产品质量,以及改善运行环境的一种主要手段。本文正是以三相异步电动机为研究对象,从电动机调速的实质出发,对异步电机的调速策略进行了研究。
随着电力电子技术、计算机技术、自动控制技术的迅速发展,交流变频调速技术得到了迅速发展,其显著的节能效益,高精确的调速精度,宽泛的调速范围,完善的保护功能,以及易于实现的自动通信功能,得到了广大用户的认可,在运行的安全可靠、安装使用、维修维护等方面,也给使用者带来了极大的便利。因此,研究交—直—交变频调速系统的基本工作原理和作用特性意义十分重大。本文对异步电机变频调速矢量控制系统进行了仿真,在该系统中,我们采用了电流跟踪控制的PWM逆变电路向三相异步电机供电,能够实时反映电机的运行情况。
关键词:异步电动机;;交流调速;PWM变频调速
Abstract
With the development of modem power electronics and control technology based puter,the technical revolution of electrical drive is is a trend that AC drive replaces DC drive puter-aided digital control takes the place of traditional analog -adjusting has e the major mean to improve energy efficiency,the production processes,quality of products and operational ,this paper researched on the asynchronous motor,and the vector control system of speed-adjusting was strategy of vector control for asynchronous motor was researched and implemented in this paper.
With power electronic technology, computer technology, automatic control tech-nology is developing rapidly, AC variable-frequency system technology has been de-veloping rapidly. Significant energy efficiency and precision and broad scope of spe-ed control, perfect protection and easy to implement munications, all which have win the many users acceptance . Therefore, studying the AC-DC-AC variable frequency systerm for the role of the basic working principle and characteristics of great significance.
Key words: asynchronous motor ; AC speed regulation;PWM variable frequency speed regulation
目录
1
1
我国变频调速技术的发展状况 2
4
改变磁极对数 4
5
改变供电电源的频率 5
开关器件的发展是改变同步频率的关键技术 6
逆变电路 6
-直-交变频器的工作原理 9
静止式变频装置简介 9
交-直-交电压型变频器的工作原理 10
单相全桥逆变电路 10
三相全桥逆变电路 12
脉冲宽度调制技术(PWM技术) 15
单相桥式PWM逆变电路 16
三相桥式PWM逆变电路 18