自动门
自动门:直流拖动控制系统基础
发布时间:2013/8/29
直流拖动控制系统基础
    对于广义的直流拖动控制系统,其组成的核心是直流电动机。众所周知,直流电动机
具有运行效率高和调速性能好等诸多优点,所以在早期的电力拖动系统特别是拖动词速系
统中大都采用直流电动机。但传统的直流电动机均采用电刷,以机械方法进行换向,因而
存在相对的机械摩擦。由此带来了噪声、火花、无线电干扰以及寿命短等致命弱点。再加
上制造成本高及维修困难等缺点,大大限制了它的应用范围。随着社会生产力的发展,及
新型的永磁材料,电力电子器件的推出,针对有刷直流电动机以上不足,人们先后研发出
无刷直流电动机、永磁同步电动机等。但无论何种直流电动机,其基本的工作原理是一样
的,只是在组成构造及换向控制方面有不同。本节先从基本的有刷直流电动机谈起,扼要
介绍该种电动机的工作原理和工作特性。然后专门用一节篇幅,介绍无刷直流电动机工作
原理及特性。从而使大家对于小型自动门拖动系统的核心有比较全面的了解。
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