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 produced by the stator does not exist until running rpm is reached. Since no starting torque is offered, 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 1 main winding and no begin winding. This configuration causes a change of the used magnetic field in relationship to the rotor, creating stating torque. Applications consist of fans and small appliances.

Split-Phase (induction start electric motor)
Has two sets of stator windings. The “start” windings are positioned 90 degrees to the “run” windings and shift the magnetic field of the stator, inducing starting torque. Applications Single Phase Induction Motor china include little grinders, small supporters, and blowers.

Capacitor-Start
The most common single-phase motor used in industrial applications. It is a altered split-stage motor with a capacitor in series with the start winding to supply a start boost. Application 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 will be the most reliable single-phase electric motor because no centrifugal beginning switch is necessary. Applications include supporters and pumps in HVAC and refrigeration industries.