Single-Phase Induction Motors
The single-phase motor operates beneath the same principle as the polyphase electric motor, except that the rotating sprockets magnetic field effect generated by the stator will not exist until running rpm is reached. Since no beginning torque is available, 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 begin winding. This configuration causes a shift of the applied magnetic field in relationship to the rotor, creating stating torque. Applications consist of fans and small appliances.

Split-Phase (induction start motor)
Has two models of stator windings. The “start” windings sit 90 degrees to the “run” windings and change the magnetic field of the stator, inducing starting torque. Applications include little grinders, small followers, and blowers.

Capacitor-Start
The most common single-phase motor found in industrial applications. It is a altered split-stage engine with a capacitor in series with the beginning winding to supply a start boost. Program include small conveyors, large 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 electric motor because no centrifugal beginning switch is required. Applications include enthusiasts and pumps in HVAC and refrigeration industries.