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 offered, 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 shift of the used magnetic field in romantic relationship to the rotor, creating stating torque. Applications consist of followers 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 change the magnetic field of the stator, inducing starting torque. Applications include chain sprocket little grinders, small followers, and blowers.
Capacitor-Start
The most typical single-phase motor used in industrial applications. It really is a altered split-stage electric motor with a capacitor in series with the beginning 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 provide starting torque. They are the most reliable single-phase engine because no centrifugal beginning switch is required. Applications include fans and pumps in HVAC and refrigeration industries.