Method for actuating an asynchronous motor

摘要

The method involves interconnecting two windings i.e. primary windings (1) and auxiliary windings (Aux1-Aux3), of an asynchronous motor by using electronic switches i.e. triacs (T0-T4), to change motor speed. The electronic switches are opened for two periods of time during the switching process. The opening of the switches during the switching process is formed as a part of a phase control, where the time delay of the phase control is changed step wise. The phase control is made occurred by the electronic switches which lie in series with the windings.