Starting Coil

A starting coil, also known as a starting capacitor or start capacitor, is an electrical component used in certain types of electric motors to help initiate the motor's rotation.

In single-phase induction motors, the starting coil is connected in series with the main winding. When the motor is initially powered on, the starting coil creates a phase shift in the current flowing through the main winding. This phase shift creates a rotating magnetic field, which helps to start the motor's rotation.

The starting coil is typically made up of a capacitor and a winding of wire. The capacitor stores electrical energy and helps to create the phase shift needed for motor starting. The winding of wire is designed to have a higher resistance than the main winding, which helps to limit the current flowing through the starting coil once the motor is running.

Once the motor has started and is running at full speed, a centrifugal switch or relay is often used to disconnect the starting coil from the circuit. This prevents the starting coil from continuously drawing current and overheating.

Overall, the starting coil is an important component in certain types of electric motors, helping to initiate the motor's rotation and ensure proper operation.