Single-Phase Induction Motors

Single-Phase Induction Motors
The single-phase electric motor operates under the same principle as the polyphase 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 offered, 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 one main winding and no start winding. This configuration causes a change of the used magnetic field in relationship to the rotor, creating stating torque. Applications chain sprocket consist of supporters 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 supporters, and blowers.

Capacitor-Start
The most typical single-phase motor used in industrial applications. It is a modified split-stage motor with a capacitor in series with the start winding to provide a start boost. Software 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 engine because no centrifugal beginning switch is necessary. Applications include followers and pumps in HVAC and refrigeration industries.

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