Single-Phase Induction Motors

Single-Phase Single Phase Induction Motor china induction Motors
The single-phase engine operates under the same principle as the polyphase electric motor, except that the rotating magnetic field effect generated 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. These are the various designations:

Torque-Speed Curves of Different Single-Phase Induction Motors

Shaded-pole: Have only one main winding no start winding. This configuration causes a shift of the applied magnetic field in romantic 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 sit 90 degrees to the “run” windings and change the magnetic field of the stator, inducing starting torque. Applications include small grinders, small followers, and blowers.

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

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