文档介绍：毕业设计(论文)
题目:交流异步电动机的速度闭环控制及其硬件实现
英文题目:Exchanges The Asynchronous Motor Speed Closed-loop Control And The Hardware Realization
系别: 电子与机械工程系
学生姓名:
班级:
指导教师:
专业: 自动化
二零零六年六月
摘要
近年来,由于直流调速的局限性和交流调速的优越性,以及计算机技术和电力电子器件的不断发展,交流异步电动机变频调速技术正在快速发展中。在现代微机技术的快速发展下,计算机运行速度不断加快提高,指令的执行速度也达到了前所未有的高度,使得复杂算法应用计算机来进行实时运算,执行成为可能。经过最近几十年的应用开发,交流异步电动机的变频调速性能已经优于直流调速系统。所以,本设计针对交流异步电动机的速度闭环控制及变频调速技术的研究是非常有必要的。
本文基于电力电子与电力传动教学实验台用单片机实现正弦脉宽调制和电压空间矢量脉宽调制的方法,实现对闭环控制异步电机的变频调速。
交流调速的脉宽调制(PWM)控制技术在电子领域是一个非常重要的技术,也是本设计之所以能实现速度控制的关键之一,所以本设计花了大篇幅加以介绍。文中第四章,针对实现本设计涉及到的芯片加以详细的说明。然后第五章介绍了系统各组成部分框图。并在第六章中详尽地对调速系统的应用作了抗干扰分析,主要包括硬件抗干扰措施和软件抗干扰措施了个方面,所以能够很好的实现对系统的设计要求,精确的达到变频调速的目的。
最后本设计在一台三相异步电动机上进行了试验调试,实验结果表明:SVPWM 调制比SPWM 调制时电机电流的谐波小,电压利用率高,电机的高频噪声低。
关键词
PWM; 变频调速; 闭环控制
Abstract
Recently, for the DC adjusting-speed system has many limitations, the AC adjusting-speed system has many merits and with the development of new power ponent puter technology. the technology of AS Asynchronous Motor variable-frequency adjusting-speed has been in fast development. The speed puter is conation tonally increasing and its execute-instruction aped had been on a very high level. With today's puter technology's swift development. it makes it possible that the real-time system pels arithmetic could run in puter .The adjusting-speed ability of AC asynchronous Motor had been already better than DC adjusting-speed system in the past several years. So this thesis is very necessary to describe it[13]。
This thesis describes the implementations of Sine Pulse Width Mod-
ulation(SPWM)using single chip on a teaching platform of eclectic power
electron drive, and achieves the purpose of variable-frequency adjusting -speed for induction motor。
The exchange velocity modulation pulse-duration modulation (PWM) control technology in the electronic domain is an extremely important technology, also is this design the reason that can realize one of speed control keys, therefore this design spent the great length