Single-Phase Induction Motors
The single-phase electric motor operates under the same principle as the polyphase motor, except that the rotating magnetic field sprockets 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 begin the motor. They are the various designations:

Torque-Speed Curves of Different Single-Phase Induction Motors

Shaded-pole: Have only one main winding no begin winding. This configuration causes a shift of the used magnetic field in relationship to the rotor, creating stating torque. Applications consist of supporters and small appliances.

Split-Phase (induction start engine)
Has two sets of stator windings. The “start” windings are positioned 90 degrees to the “run” windings and change the magnetic field of the stator, inducing starting torque. Applications include small grinders, small enthusiasts, and blowers.

Capacitor-Start
The most common single-phase motor found in industrial applications. It really is a altered split-stage electric motor with a capacitor in series with the start winding to supply a start boost. Program include small conveyors, huge blowers, pumps, and direct-drives.

Permanent-Split-Capacitor (PSC)
Uses identical main 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 supporters and pumps in HVAC and refrigeration industries.