Contactless commutation electricity-saving controller of asynchronous motor

The utility model relates to a asynchronous motor non contact reversing electric controller, which comprises a master loop electronic switch, a motor working voltage sampling circuit unit, a motor working current sampling circuit unit, a filter, a level adjustor, a constant current control circuit unit, a over current protection circuit unit, a power voltage sync and saw tooth generator, a comparator, a motor inverting controller, an inverting signal circuit unit and an inverting electronic switch, wherein the inverting electronic switch 10 is connected at input end of the master loop electronic switch 11 and output end of the master loop electronic switch 21, the inverting electronic switch 20 is connected at input end of the master loop electronic switch 21 and output end of the master loop electronic switch. The whole circuit is of inverting, electric saving, soft start and error protection functions, which guarantees the motor rotating with constant speed.