The Single Phase Motor is not self-starting and hence needs an auxiliary means or equipment to start the single-phase induction motor. Mechanical methods are impractical and, therefore the motor is started temporarily converting into a two-phase motor.
Single-phase Induction motors are usually classified according to the auxiliary means used to start the motor. They are classified according to the starting methods.
The various starting methods of a Single Phase Induction motor are as follows:
- Split Phase Motor
- Capacitor Start Motor
- Capacitor Start Capacitor Run Motor or Two value capacitor motor
- Permanent Split Capacitor (PSC) or Single value capacitor motor
- Shaded Pole Motor.
All these starting methods are explained individually in detail in the separate articles. These starting methods depend on the two alternating fields displaced in space and phase.
The rotating field is the resultant of the two individual fields. This rotating field reacts with the cage rotor to provide the starting torque. One field is produced by the field winding and the other by the auxiliary winding or the starting winding.