The phase shift of 90° between the main winding and the auxiliary winding is achieved by a connected capacitor which feeds the auxiliary winding and is connected on the single-phase AC mains. The capacitor will achieve a phase shift of 90° between the main and the auxiliary winding, producing an acceptable initial torque.
The 90° phase shift between the main and auxiliary windings is achieved by a capacitor that connects to the single-phase AC power supply. The capacitor creates a 90° phase difference between the two windings, resulting in an acceptable initial torque.