Single-Phase Induction Motors
The single-phase electric motor operates under the same principle as the polyphase motor, sprockets except that the rotating magnetic field effect generated by the stator does not exist until running rpm is reached. Since no beginning torque is offered, a design system is included to start 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 consist of enthusiasts and small appliances.

Split-Phase (induction start motor)
Has two pieces of stator windings. The “start” windings sit 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 found in industrial applications. It is a altered split-stage motor with a capacitor in series with the start winding to supply a start boost. Application include small conveyors, large blowers, pumps, and 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 engine because no centrifugal beginning switch is required. Applications include supporters and pumps in HVAC and refrigeration industries.