CONTROL DEVICE FOR A THREE-PHASE ASYNCHRONOUS MOTOR

摘要

The proposed control device for a three-phase asynchronous motor with the stator winding connected according to the star circuit contains a direct frequency converter and additionally a bridge circuit with switching elements inserted in the branches of the bridge circuit. The input terminals of the bridge circuit are connected to the output terminals of the frequency converter. The stator winding pf the motor is connected to the output terminals of the bridge circuit. The present invention provides a possibility to control the rotation frequency of the motor in a range from zero the rated rotation frequency, simplify the control circuit, and reduce operational costs.