YOKOGAWA AAI543-S50
使旋转中的电动机获得一个逆旋转方向的力矩,以使其较快地降低转速的过程,称为电动机的制动。对于传动生产机械的异步电动机,有时需要很快地使其运动完全停止;有时需要在电动机的运动中加入一个一定的均匀的制动力距,但不要求电动机立即停止,如起重机在提吊的重物下降时,电动机车在下坡时,都需要后一种制动,鼠笼式异步电动机有三种制动方法,即反接制动、发电制动(再生制动)和动力制动(能耗制动),制动操作的要点如下:
(1)反接制动
通常,电动机断电后,由于惯性作用,还有一段惯性时间,鼠笼式感应电动机的反接制动,是在断电的同时,把输入电源的相序变换一下,改变电动机定子旋转磁场的方向,使转子产生一个逆旋转方向的制动力矩,经过短暂的时刻,再把输入的电源切断,电动机边很快就停止转动。
(2)发电制动(再生制动)
发电制动是在电动机的转速高于旋转磁场同步转速时进行的,因为按右手定则,此时转子导体产生感应电流,而该电流在旋转磁场的作用下,产生一个反旋转方向的这个制动力距,电动机便处于发电制动状态。
(3)动力制动(能耗制动)
在供电电源切除后,立即向定子绕组通以直流电流,于是形成一个固定(静止)的磁场,而转子由于惯性仍按原方向转动,根据左手定则,转子中会产生感应电流,此电流在固定磁场的作用下,产生一个方向,其方向与电动机按惯性转动的方向恰好相反,所以起到制动作用
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