Single-Phase Induction Motors
The single-phase engine operates under the same principle as the polyphase electric motor, except that the rotating magnetic field effect produced by the stator does not exist until running rpm is reached. Since no beginning torque is obtainable, a design mechanism is included to begin the motor. They are the various designations:
Torque-Speed Curves of Different Single-Phase Induction Motors
Shaded-pole: Have only 1 main sprockets winding no start winding. This configuration causes a shift of the used magnetic field in relationship to the rotor, creating stating torque. Applications include supporters and small appliances.
Split-Phase (induction start motor)
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 beginning torque. Applications include little grinders, small enthusiasts, and blowers.
Capacitor-Start
The most common single-phase motor found in industrial applications. It really is a modified split-stage 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 primary and auxiliary windings with a capacitor to provide starting torque. They are the most reliable single-phase motor because no centrifugal beginning switch is required. Applications include supporters and pumps in HVAC and refrigeration industries.
