Single-Phase Induction Motors

Single-Phase Induction Motors
The single-phase electric motor operates beneath the same principle as the polyphase electric motor, except that the rotating magnetic field effect produced by the stator does not exist until running rpm is reached. Since no beginning torque is available, a design system is included to start the motor. They 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 shift of the used magnetic field in relationship to the rotor, creating stating torque. Applications include supporters and small appliances.

Split-Phase (induction start electric motor)
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 supporters, and blowers.

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

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