Single-Phase Induction Motors
The single-phase motor operates under 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 starting torque is offered, a design mechanism is included to begin 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 begin winding. This configuration causes a shift of the used magnetic field in relationship to the rotor, creating stating torque. Applications consist of supporters and small appliances.
Split-Phase (induction start engine)
Has two pieces 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 followers, and blowers.
Capacitor-Start
The most common single-phase motor used in industrial applications. It is a modified split-stage electric motor with a capacitor in series with the start winding to provide a start boost. Software include small conveyors, huge blowers, pumps, and direct-drives.
Permanent-Split-Capacitor (PSC)
Uses identical main and auxiliary windings with a capacitor to sprockets supply starting torque. They will be the most reliable single-phase engine because no centrifugal starting switch is required. Applications include enthusiasts and pumps in HVAC and refrigeration industries.