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

chain sprocket 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 used magnetic field in romantic relationship to the rotor, creating stating torque. Applications include supporters and small appliances.

Split-Phase (induction start engine)
Has two sets of stator windings. The “start” windings are positioned 90 degrees to the “run” windings and shift 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 is a altered split-stage engine with a capacitor in series with the start winding to provide a start boost. Application include small conveyors, large blowers, pumps, and direct-drives.

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