In capacitor-start, capacitor-run motors, what is the function of the start capacitor?

In capacitor-start, capacitor-run motors, the start capacitor plays a crucial role in increasing starting torque. When the motor is initially energized, the start capacitor provides an additional phase shift to the current in the start winding, allowing the motor to develop the necessary torque to overcome inertia and start rotating. This is particularly important in applications where the motor needs to start under load.

Once the motor reaches a certain speed, typically around 75% of its rated speed, a centrifugal switch or similar device disconnects the start capacitor from the circuit, allowing the motor to continue running using the run winding. The presence of the start capacitor effectively enhances the motor's ability to start up efficiently and reliably, making it essential for the initial phase of operation.

The other options, while somewhat related to motor performance, do not accurately define the specific function of the start capacitor in this type of motor.