Single-Phase Induction Motors

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

Torque-Speed Curves of Different Single-Phase Induction Motors

Shaded-pole: Have only 1 main winding no begin winding. This configuration causes a change of the applied magnetic field in relationship to the rotor, creating stating torque. Applications consist of supporters and small chain sprocket appliances.

Split-Phase (induction start motor)
Has two models of stator windings. The “start” windings are positioned 90 degrees to the “run” windings and change 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 altered split-stage motor with a capacitor in series with the beginning winding to supply a start boost. Application 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 motor because no centrifugal starting switch is required. Applications include enthusiasts and pumps in HVAC and refrigeration industries.