Single-Phase Induction Motors
The single-phase engine operates under the same principle as the polyphase electric motor, except that the rotating magnetic field effect produced by the stator will not exist until running rpm is reached. Since no starting torque is obtainable, a design system is included to begin the motor. They are the various designations:

Torque-Speed Curves of Different Single-Phase Induction Motors

Shaded-pole: Have only 1 main winding no start winding. This configuration causes a shift of the used magnetic field in relationship to the rotor, creating stating torque. Applications include supporters and small appliances.

Split-Phase (induction start motor)
Has two Single Phase Induction Motor china pieces of stator windings. The “start” windings are positioned 90 degrees to the “run” windings and change the magnetic field of the stator, inducing starting torque. Applications include little grinders, small supporters, and blowers.

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

Permanent-Split-Capacitor (PSC)
Uses identical primary and auxiliary windings with a capacitor to provide 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.