Single-Phase Induction Motors
The single-phase electric motor operates beneath the same principle as the sprockets polyphase motor, except that the rotating magnetic field effect produced by the stator will not exist until running rpm is reached. Since no starting torque is offered, a design system is included to start 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 applied magnetic field in relationship to the rotor, creating stating torque. Applications consist of fans and small appliances.
Split-Phase (induction start engine)
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 little grinders, small fans, and blowers.
The most typical single-phase motor used in industrial applications. It really is a modified split-phase motor with a capacitor in series with the start winding to provide a start boost. Program include small conveyors, huge blowers, pumps, and direct-drives.
Uses identical main and auxiliary windings with a capacitor to provide starting torque. They are the most reliable single-phase engine because no centrifugal starting switch is necessary. Applications include followers and pumps in HVAC and refrigeration industries.