Single-Phase Induction Motors
The single-phase electric motor operates under the same principle as the polyphase motor, Single Phase Induction Motor china except that the rotating magnetic field effect generated by the stator does not exist until running rpm is reached. Since no beginning torque is offered, 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 used magnetic field in relationship to the rotor, creating stating torque. Applications include followers 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 enthusiasts, and blowers.
Capacitor-Start
The most typical single-phase motor found in industrial applications. It is a altered split-stage electric motor with a capacitor in series with the start winding to provide a start boost. App 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 are the most reliable single-phase electric motor because no centrifugal beginning switch is required. Applications include supporters and pumps in HVAC and refrigeration industries.