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

Split-Phase (induction start electric motor)
Has two sets of images?q=tbn:ANd9GcQOQs8JqSAk1bbHqxGs0nbTkacrgARvf1i3oOji0YS0crb2L 0S4Astator 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 typical single-phase motor found in industrial applications. It really is a modified split-phase motor with a capacitor in series with the start winding to provide a start boost. App 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 required. Applications include followers and pumps in HVAC and refrigeration industries.