Single-Phase Induction Motors
The single-phase electric motor operates beneath 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 available, a design mechanism 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 no start winding. This configuration causes a shift of the applied magnetic field in sprockets romantic relationship to the rotor, creating stating torque. Applications consist of fans 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 shift the magnetic field of the stator, inducing starting torque. Applications include small grinders, small supporters, and blowers.
Capacitor-Start
The most common single-phase motor used in industrial applications. It really is a modified split-stage engine with a capacitor in series with the beginning winding to provide a start boost. Program include small conveyors, huge blowers, pumps, and direct-drives.
Permanent-Split-Capacitor (PSC)
Uses identical primary and auxiliary windings with a capacitor to supply starting torque. They are the most reliable single-phase electric motor because no centrifugal starting switch is necessary. Applications include enthusiasts and pumps in HVAC and refrigeration industries.