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直流发电机工作原理
1970-01-01 08:33:38
source:admin
什么是直流发电机的工作原理呢?就是把电枢线圈中感应的交变电动势,靠换向作用,使之从电刷端引出时变为直流电动势。
感应电动势的方向按照右手定则确定(磁感线指向手心,大拇指指向导体运动方向,其他四指的指向就是导体中感应电动势的方向)。
导体受力的方向用左手定则确定。这一对电磁力形成了作用于电枢一个力矩,这个力矩在旋转电机力称为电磁转矩,转矩的方向是逆时针方向,企图使电枢逆时针方向转动。如果此电磁转矩能够克服电枢上的阻转矩(例如有摩擦引起的阻转矩以及其他负载转矩),电枢就能按逆时针方向旋转起来。
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高压电机的差动保护
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