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Single-Phase Induction Motors
The single-phase engine operates beneath the same principle as the polyphase motor, except that the rotating magnetic field effect generated by the stator does not exist until running rpm is reached. Since no starting torque is obtainable, 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 one main winding 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 motor)
Has two units of stator windings. The “start” windings are sprockets positioned 90 degrees to the “run” windings and change 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 altered split-phase engine with a capacitor in series with the start winding to provide a start boost. Program include small conveyors, huge 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 motor because no centrifugal starting switch is required. Applications include supporters and pumps in HVAC and refrigeration industries.