What is the principle of the single-phase induction motor?
A single-phase winding sets up an alternating magnetic field. Since this field does not rotate, a single-phase winding alone cannot produce torque to start the motor from rest. Once the motor has been started, however, it will continue to run provided the load is not too high. To start the motor electrically, it is necessary to employ an auxiliary winding in parallel and make the current in this winding differ in phase from the current in the main winding. Simulating a two-phase supply in this way, the combined effect of the fields set up by the two windings is a more or less effective relating field, thus providing a starting torque. After starting, relation of the field is carried out by currents set up in the secondary winding and the auxiliary primary winding is generally switched out of circuit. 4. How does the single-phase induction motor work? The auxiliary winding is usually wound with about the same number of turns as the main winding but of much smaller wire. Because of the m
