| 摘要 |
FIELD: electricity.SUBSTANCE: device comprises a three-phase rectifying bridge, to which ends of primary winding of a transformer in a "star" connection are joined. Polar outputs of the three-phase rectifying bridge via transistors are connected to a zero wire of supply voltage. Points of transformer windings connection to a three-phase rectifying bridge are also connected to a zero wire via RC-circuits. The secondary winding is connected as star, three-phase voltage from it arrives to a diode bridge, polar outputs of which via throttles are connected to each other and connected to an anchor winding of the motor, with its other end the winding is connected to a zero point of the secondary winding of the transformer.EFFECT: reduced voltage on keys and switching overvoltages arising in process of operation, besides, reverse mode implementation is provided.2 dwg |
