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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 will not exist until running rpm is reached. Since no starting torque is offered, 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 one main Single Phase Induction Motor china winding and no start winding. This configuration causes a change of the applied magnetic field in relationship to the rotor, creating stating torque. Applications include enthusiasts 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 change the magnetic field of the stator, inducing beginning torque. Applications include little grinders, small fans, and blowers.

Capacitor-Start
The most common single-phase motor used in industrial applications. It really is a altered split-phase 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 primary and auxiliary windings with a capacitor to provide starting torque. They are the most reliable single-phase electric motor because no centrifugal starting switch is necessary. Applications include enthusiasts and pumps in HVAC and refrigeration industries.

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