Single-Phase Induction Motors
The single-phase motor operates beneath the same chain sprocket 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 beginning torque is offered, a design mechanism is included to start the motor. These are the various designations:
Torque-Speed Curves of Different Single-Phase Induction Motors
Shaded-pole: Have only one main winding no begin winding. This configuration causes a change of the applied magnetic field in relationship to the rotor, creating stating torque. Applications include 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 shift the magnetic field of the stator, inducing starting torque. Applications include small grinders, small supporters, and blowers.
The most typical single-phase motor used in industrial applications. It is a altered split-phase engine with a capacitor in series with the start winding to supply a start boost. Application include small conveyors, huge blowers, pumps, and direct-drives.
Uses identical main and auxiliary windings with a capacitor to provide starting torque. They are the most reliable single-phase engine because no centrifugal starting switch is necessary. Applications include followers and pumps in HVAC and refrigeration industries.