Single-Phase Induction Motors

Single-Phase Induction Motors
The single-phase electric motor operates beneath 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 starting torque is available, a design mechanism is included to begin 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 relationship to the rotor, creating stating torque. Applications include fans and small appliances.

Split-Phase (induction start engine)
Has two sets 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 common single-phase motor used in industrial applications. It is a altered split-phase motor with a capacitor in series with the beginning winding to supply a start boost. Single Phase Induction Motor Software include small conveyors, huge blowers, pumps, and direct-drives.

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

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