Single-Phase Induction Motors
The single-phase motor chain sprocket 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 beginning 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 and no start winding. This configuration causes a shift of the used magnetic field in relationship to the rotor, creating stating torque. Applications consist of enthusiasts and small appliances.
Split-Phase (induction start electric motor)
Has two pieces of stator windings. The “start” windings sit 90 degrees to the “run” windings and shift the magnetic field of the stator, inducing starting torque. Applications include small grinders, small supporters, and blowers.
The most typical single-phase motor used in industrial applications. It is a modified split-stage electric 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.
Uses identical main and auxiliary windings with a capacitor to supply starting torque. They will be the most reliable single-phase engine because no centrifugal beginning switch is necessary. Applications include followers and pumps in HVAC and refrigeration industries.