Single-Phase Induction Motors
The single-phase engine operates under the same principle as the 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 start winding. This configuration causes a change of the applied magnetic field in relationship to the rotor, creating stating torque. Applications include supporters and small appliances.
Split-Phase (induction start engine)
Has two pieces 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 little grinders, small supporters, and blowers.
Capacitor-Start
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. Software include small conveyors, huge 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 sprockets reliable single-phase engine because no centrifugal beginning switch is necessary. Applications include followers and pumps in HVAC and refrigeration industries.