Single-Phase Induction Motors
The single-phase Single Phase Induction Motor electric motor operates under the same 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 starting torque is available, 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 and no start winding. This configuration causes a shift of the used magnetic field in romantic relationship to the rotor, creating stating torque. Applications include fans and small appliances.
Split-Phase (induction start electric 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 little grinders, small fans, and blowers.
Capacitor-Start
The most common single-phase motor used in industrial applications. It is a altered split-stage electric motor with a capacitor in series with the start winding to supply a start boost. Program include small conveyors, huge blowers, pumps, and direct-drives.
Permanent-Split-Capacitor (PSC)
Uses identical main and auxiliary windings with a capacitor to provide starting torque. They will be the most reliable single-phase engine because no centrifugal beginning switch is necessary. Applications include followers and pumps in HVAC and refrigeration industries.