6SL3353-3AG41-4BA0

6SL3353-3AG41-4BA0

要实现三相异步电动机的正反转，需要将任意两个相的接线位置进行互换，这样电动机的旋转方向就会反转。具体来说，如果将A、B两相的接线位置互换，那么电动机就会发生反转，此时电流的相对方向和线圈的相对位置都会发生变化，导致电动机旋转方向反转。

　　在实际的电路中，可以通过使用一个正反转开关或者一个继电器来控制电动机的正反转。当需要电动机正转时，正反转开关或继电器将A、B、C相连接到电源上；当需要电动机反转时，开关或继电器将A、C相和B、C相互换位置连接到电源上，这样就可以实现电动机的正反转。

　　三相异步电动机正反转控制电路图

　　1、正反转的电气原理

　　在电机内部有一个由发动机带动的转子（旋转磁场），磁场外有一个子绕组，绕组有3组线圈（三相绕组），三相绕组彼此相隔120°电角。

　　当转子旋转时，旋转磁场使固定的定子绕组切割磁力线（或使电动势绕组中通过的磁通量发生变化）而产生电动线圈所能产生的电动势的大小，和线圈通量的强弱、磁极的旋转速度成正比。

　　2、注意事项

　　实现三相异步电动机的正反转控制，将其电源的相序中任意两相对调即可（称为换相），通常是V相不变，将U相与W相对调，为保证两个接触器动作时能够可靠调换电动机的相序，接线时应使接触器的上口接线保持一致，在接触器的下口调相。

　　将两相相序对调，须确保二个KM线圈不能同时得电，否则会发生严重的相间短路故障，因此采取联锁。

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