Single-Phase Induction Motors
The single-phase motor operates beneath the same principle as the polyphase engine, except that the rotating magnetic field effect produced by the stator does not exist until running rpm is reached. Since no starting 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 sprockets configuration causes a shift of the used magnetic field in romantic relationship to the rotor, creating stating torque. Applications include followers and small appliances.
Split-Phase (induction start electric 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 little grinders, small supporters, and blowers.
Capacitor-Start
The most common single-phase motor used in industrial applications. It is a modified split-stage motor with a capacitor in series with the beginning winding to supply a start boost. Software include small conveyors, large blowers, pumps, and direct-drives.
Permanent-Split-Capacitor (PSC)
Uses identical primary and auxiliary windings with a capacitor to supply starting torque. They will be the most reliable single-phase electric motor because no centrifugal beginning switch is necessary. Applications include enthusiasts and pumps in HVAC and refrigeration industries.