Single-Phase Induction Motors
The single-phase engine operates under the same principle as the polyphase engine, except that the rotating magnetic field effect produced by the stator does not exist until running rpm is reached. Since no starting torque is obtainable, a design mechanism is included to start the motor. They are the various designations:
Torque-Speed Curves of Different Single-Phase Induction Motors
Shaded-pole: Have only 1 main winding no start winding. This configuration causes a change of the used magnetic field in romantic relationship to the rotor, creating stating torque. Applications include supporters and small appliances.
Split-Phase (induction start engine)
Has two pieces of stator windings. The “start” windings sit 90 degrees to the “run” windings and change the magnetic field of the stator, chain sprocket inducing beginning torque. Applications include small grinders, small supporters, and blowers.
The most common single-phase motor used in industrial applications. It is a altered split-phase 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.
Uses identical primary 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 supporters and pumps in HVAC and refrigeration industries.