Single-Phase Induction Motors
The single-phase motor operates under the same principle as the polyphase electric motor, except that the rotating magnetic field effect produced by the stator will not exist until running rpm is reached. Since no beginning torque is available, a design mechanism is sprockets included to begin the motor. These are the various designations:
Torque-Speed Curves of Different Single-Phase Induction Motors
Shaded-pole: Have only one main winding and no begin winding. This configuration causes a change of the applied magnetic field in romantic relationship to the rotor, creating stating torque. Applications consist of enthusiasts and small appliances.
Split-Phase (induction start 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 include small grinders, small followers, and blowers.
Capacitor-Start
The most typical single-phase motor found in industrial applications. It really is a modified split-phase engine with a capacitor in series with the start winding to supply a start boost. Application 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 will be the most reliable single-phase electric motor because no centrifugal beginning switch is required. Applications include fans and pumps in HVAC and refrigeration industries.