chain sprocket 
single-phase Induction Motors
The single-phase motor operates beneath the same principle as the polyphase electric 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 begin the motor. These are the various designations:
Torque-Speed Curves of Different Single-Phase Induction Motors
Shaded-pole: Have only one main winding and no start winding. This configuration causes a change of the used magnetic field in romantic relationship to the rotor, creating stating torque. Applications include fans 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 followers, and blowers.
Capacitor-Start
The most typical single-phase motor found in industrial applications. It is a modified split-phase electric motor with a capacitor in series with the start winding to supply 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 beginning switch is required. Applications include followers and pumps in HVAC and refrigeration industries.
