How does a capacitor start motor create the necessary starting torque?

A capacitor start motor generates the necessary starting torque by utilizing a capacitor in the starting circuit. When the motor is powered on, the capacitor is connected to the starting winding. This creates a phase shift in the current flowing through the windings, resulting in a rotating magnetic field that enhances the starting torque.

The capacitor introduces a leading current, which helps to create a significant difference in the magnetic fields between the main and start windings. This phase difference is crucial because it generates a powerful initial torque, enabling the motor to overcome inertia and start moving efficiently. Once the motor reaches a certain speed, the capacitor is typically disconnected from the circuit, allowing the motor to operate using only the main winding.

Understanding this principle is essential in motor control applications, as it distinguishes capacitor start motors from other types of motors that may rely on different methods for generating starting torque.