What does a capacitor do on an AC motor?

A motor capacitor is applied to:
1. Set motor ratate direction
2. Provide starting torque to start motor

A motor capacitor (or start capacitor) is used to change the current to one or more windings of a single-phase AC induction motor to create a rotating magnetic field. A single-phase AC motor may be difficult to start or unable to start without the capacitor. In addition, capacitor specs must be selected to match the motor specs. If a capacitor with an excessive capacity is used, although the starting torque can be generated, the motor will also generate heat and abnormal vibration. if a capacitor with too small capacity is used, insufficient starting torque may not be able to start the motor. A capacitor is included when ordering a new motor.