Single-Phase Induction Motors
The single-phase electric motor operates under the same principle as the polyphase engine, except that the rotating magnetic field Single Phase Induction Motor china effect generated by the stator will not exist until running rpm is reached. Since no starting torque is available, a design mechanism is included to begin the motor. They are the various designations:
Torque-Speed 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 applied magnetic field in romantic relationship to the rotor, creating stating torque. Applications consist of enthusiasts and small appliances.
Split-Phase (induction start motor)
Has two sets of stator windings. The “start” windings are positioned 90 degrees to the “run” windings and change the magnetic field of the stator, inducing beginning torque. Applications include small grinders, small supporters, and blowers.
Capacitor-Start
The most common single-phase motor found in industrial applications. It is a modified split-stage electric motor with a capacitor in series with the beginning winding to provide a start boost. Software include small conveyors, large blowers, pumps, and direct-drives.
Permanent-Split-Capacitor (PSC)
Uses identical main and auxiliary windings with a capacitor to provide starting torque. They are the most reliable single-phase electric motor because no centrifugal starting switch is necessary. Applications include fans and pumps in HVAC and refrigeration industries.