Single-Phase Induction Motors

Single-Phase Induction Motors
The single-phase motor operates beneath the same principle as the polyphase electric motor, except that the rotating magnetic field effect produced by the stator will not exist until running rpm is reached. Since no starting torque is obtainable, a design mechanism is included to start the motor. They are the various Single Phase Induction Motor designations:

Torque-Speed Curves of Different Single-Phase Induction Motors

Shaded-pole: Have only one main winding no start winding. This configuration causes a change of the used magnetic field in relationship to the rotor, creating stating torque. Applications consist of fans and small appliances.

Split-Phase (induction start electric motor)
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 beginning torque. Applications include small grinders, small supporters, and blowers.

Capacitor-Start
The most typical single-phase motor used in industrial applications. It is a altered split-stage engine with a capacitor in series with the beginning winding to provide a start boost. Application include small conveyors, large blowers, pumps, and direct-drives.

Permanent-Split-Capacitor (PSC)
Uses identical primary and auxiliary windings with a capacitor to supply starting torque. They will be the most reliable single-phase electric motor because no centrifugal beginning switch is required. Applications include followers and pumps in HVAC and refrigeration industries.

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