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Permanent Split Phase motor

A permanent Split phase motor consists of a main winding and an auxiliary winding.  The auxiliary winding has a capacitor in series.  The auxiliary is always in circuit.  It produces a flux which is displaced from the main flux by 90 degrees.

The permanent split phase motor suffers from torque pulsations at main speed.  The permanent split phase motor is used up to 1/4 horse power.  The starting torque is relatively lower.  Hence, the permanent split phase motor is not used for applications which require high torque.