自动门
自动门:异步电动机的机械特性及电力拖动
发布时间:2013/11/6
自动门讯:
异步电动机的机械特性及电力拖动
 (1)机械特性。
    机械特性是指电动机在运行时,其转速与电磁转
矩之间的关系
    1)理想空载点
    2)启动点
    3)临界点。临界点K是一个非常重要的点,它是机械特性稳定运行区和非稳定运行
区的分界点。
    普通电动机的风=2.0~2.2之间,而对某些特殊用途电动机,其过载能力可以更高
一些。
 (2)电动机的稳定运行。
    1)电动机稳定运行状态。
    2)电动机工作点的动态调速过程。
 (3)异步电动机的启动和制动。
    1)异步电动机的启动。电动机从静止状态一直加速到稳定转速的过程,称为启动过
程。电动机启动时启动电流很大,对于大功率电动机,其启动电流可以达到额定电流的5
~7倍,而启动转矩丁..却并不很大,一般Ts.=(1. 8~2) TN。为了减小启动电流常用降
低电压的方法来启动。
    笼型异步电动机常见的减压启动方法有:自耦变压器减压启动、Y-A启动、定子串
电阻或串电抗减压启动等。

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