Reversing device for starting a three-phase asynchronous squirrel-cage motor from a single-phase network

摘要

The utility model relates to the field of electrical engineering and can be used to start an induction motor with the possibility of reverse. In a reversing device for starting a three-phase asynchronous squirrel-cage motor from a single-phase network, each of the two reversing semiconductor switches contains two counter-parallel connected transistors designed to power the stator windings of the electric motor when connecting the stator windings according to the "triangle" circuit. In the first reversible semiconductor switch, the emitter of the first transistor is connected to the collector of the second transistor, and the common point of their connection is connected to the common output of the first and third stator windings, and the collector of the first transistor is connected to the emitter of the second transistor, and the common point of their connection is connected to zero supply voltage, In the second reversible semiconductor switch, the collector of the third transistor is connected to the emitter of the fourth transistor, and the common point of their connection is connected to zero its voltage, and the emitter of the third transistor is connected to the collector of the fourth transistor, and the common point of their connection is connected to the common output of the second and third stator windings. The common output of the first and second stator windings is connected to the phase of the supply voltage. The reliability of the device is significantly increased. 3 ill.