Industry News | 2021-12-05 20:05:13.0
The PTC (positive temperature coefficient) relay is directly connected in series with the secondary winding (start winding) and in parallel with the main winding of the motor. When AC 220V is applied to the two windings, a phase difference will be generated due to phase separation, thus forming an elliptical rotating magnetic field and generating a starting torque to drive the normal operation of the motor. After that, because the PTC relay is under a high resistance state, the starting circuit is nearly disconnected, and only the running winding drives the motor to run.
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