Single-Phase Induction Motors
The single-phase electric motor operates under the same principle as the polyphase motor, except that the rotating magnetic field effect generated by the sprockets stator does not exist until running rpm is reached. Since no beginning torque is obtainable, a design system is included to start the motor. They are the various designations:
Torque-Speed Curves of Different Single-Phase Induction Motors
Shaded-pole: Have only 1 main winding and no start winding. This configuration causes a change of the applied magnetic field in relationship to the rotor, creating stating torque. Applications consist of supporters and small appliances.
Split-Phase (induction start motor)
Has two models of stator windings. The “start” windings are positioned 90 degrees to the “run” windings and shift the magnetic field of the stator, inducing beginning torque. Applications include little grinders, small supporters, and blowers.
Capacitor-Start
The most typical single-phase motor used in industrial applications. It is a modified split-phase electric motor with a capacitor in series with the start winding to supply 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 will be the most reliable single-phase motor because no centrifugal beginning switch 
is necessary. Applications include fans and pumps in HVAC and refrigeration industries.