Single-Phase Induction Motors
The single-phase motor operates under the same principle as the polyphase engine, except that the rotating magnetic field effect produced by the stator does not exist until running rpm is reached. Since no beginning torque is available, 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 1 main winding no begin winding. This configuration causes a change of the used magnetic field in romantic relationship to the rotor, creating stating torque. Applications include enthusiasts and small appliances.
Split-Phase (induction start motor)
Has two units of stator windings. The “start” windings are positioned 90 degrees to the “run” windings and change the magnetic field of the stator, inducing beginning torque. Applications include little grinders, small enthusiasts, 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 supply a start boost. App 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 chain sprocket reliable single-phase engine because no centrifugal starting switch is necessary. Applications include followers and pumps in HVAC and refrigeration industries.