Single-Phase Induction Motors
The single-phase motor operates beneath the same principle as the polyphase sprockets engine, except that the rotating magnetic field effect generated by the stator does not exist until running rpm is reached. Since no beginning 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 one main winding and 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 followers and small appliances.
Split-Phase (induction start electric motor)
Has two sets of stator windings. The “start” windings sit 90 degrees to the “run” windings and shift the magnetic field of the stator, inducing beginning torque. Applications include small grinders, small followers, and blowers.
Capacitor-Start
The most common single-phase motor found in industrial applications. It is a altered split-phase electric motor with a capacitor in series with the beginning winding to supply a start boost. Application 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 will be the most reliable single-phase motor because no centrifugal starting switch is required. Applications include enthusiasts and pumps in HVAC and refrigeration industries.