Single-Phase Induction Motors
The single-phase motor operates under the same principle as the polyphase electric motor, except that the rotating magnetic field effect produced by the stator does not exist until running rpm is chain sprocket 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 no start winding. This configuration causes a shift of the used magnetic field in relationship to the rotor, creating stating torque. Applications include supporters and small appliances.

Split-Phase (induction start electric motor)
Has two pieces 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 little grinders, small followers, and blowers.

Capacitor-Start
The most typical single-phase motor found in industrial applications. It really is a altered split-phase electric motor with a capacitor in series with the start winding to supply 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 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.