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Single-Phase Induction Motors
The single-phase engine operates under the same principle as the polyphase engine, except that the rotating magnetic field effect produced by the stator will not exist until running rpm is reached. Since no beginning torque is offered, 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 used magnetic field in relationship to the rotor, creating stating torque. Applications include fans and small appliances.

Split-Phase (induction start engine)
Has two models of stator windings. The “start” windings are positioned 90 degrees to the “run” windings and shift the magnetic field of the stator, inducing beginning torque. Applications include small grinders, small followers, and blowers.

Capacitor-Start
The most common single-phase motor used in industrial applications. It really is a modified split-phase electric motor with a capacitor in series with the start winding to supply a start boost. Program include small conveyors, huge blowers, pumps, and Single Phase Induction Motor direct-drives.

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