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

Torque-Speed Curves of Different Single-Phase Induction Motors

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

Split-Phase (induction start electric motor)
Has two units 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 small grinders, small enthusiasts, and blowers.

Capacitor-Start
The most typical single-phase motor used in industrial applications. It really is a modified split-phase engine with a capacitor in series with the beginning winding to supply a start boost. Program 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 electric motor because no centrifugal starting switch is necessary. Applications include followers and pumps in HVAC and refrigeration industries.