Single-Phase Induction Motors
The single-phase electric motor operates under the same principle as the polyphase electric motor, except that the rotating magnetic field effect generated by 
the stator will not exist until running rpm is reached. Since no starting torque is obtainable, a design mechanism is included to start the motor. These are the various designations:
Torque-Speed sprockets Curves of Different Single-Phase Induction Motors
Shaded-pole: Have only one main winding and no begin winding. This configuration causes a shift of the used magnetic field in romantic relationship to the rotor, creating stating torque. Applications consist of supporters and small appliances.
Split-Phase (induction start motor)
Has two units of stator windings. The “start” windings sit 90 degrees to the “run” windings and change the magnetic field of the stator, inducing beginning torque. Applications include small grinders, small fans, and blowers.
Capacitor-Start
The most typical single-phase motor found in industrial applications. It is a altered split-phase electric motor with a capacitor in series with the beginning winding to provide a start boost. Program 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 motor because no centrifugal starting switch is necessary. Applications include fans and pumps in HVAC and refrigeration industries.