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 beginning torque is offered, 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 change of the applied magnetic field in romantic relationship to the rotor, creating stating torque. Applications consist of fans and small appliances.
Split-Phase (induction start electric motor)
Has two pieces of stator windings. The “start” windings sit 90 degrees to the “run” windings and shift the magnetic field of the stator, inducing starting torque. Applications include little grinders, small fans, and blowers.
The most common single-phase motor found in industrial applications. It is a altered split-stage motor with a capacitor in series with the start winding to provide a start boost. Program include small conveyors, large blowers, pumps, and direct-drives.
Uses identical primary and sprockets auxiliary windings with a capacitor to provide starting torque. They will be the most reliable single-phase motor because no centrifugal starting switch is necessary. Applications include supporters and pumps in HVAC and refrigeration industries.