Single-Phase Induction Motors
The single-phase motor operates beneath the same principle as the polyphase motor, except that the rotating magnetic field effect generated by the stator does not exist until running rpm is reached. Since no starting torque is obtainable, a design system is included to start the motor. These are the various designations:

Torque-Speed Curves of Different Single-Phase Induction Motors

Shaded-pole: Have only one main winding no start winding. This configuration causes a change of the applied magnetic field in romantic relationship to the rotor, creating stating torque. Applications include followers and small appliances.

Split-Phase (induction start motor)
Has two sets of stator windings. The “start” sprockets windings sit 90 degrees to the “run” windings and change the magnetic field of the stator, inducing beginning torque. Applications include little grinders, small supporters, and blowers.

Capacitor-Start
The most typical single-phase motor found in industrial applications. It really is a modified split-stage engine with a capacitor in series with the beginning winding to supply a start boost. App include small conveyors, huge blowers, pumps, and direct-drives.

Permanent-Split-Capacitor (PSC)
Uses identical main and auxiliary windings with a capacitor to supply starting torque. They are the most reliable single-phase motor because no centrifugal beginning switch is necessary. Applications include fans and pumps in HVAC and refrigeration industries.