What is the primary function of a centrifugal switch?

The primary function of a centrifugal switch is to disconnect the start winding when the motor reaches a certain speed. In a typical single-phase motor, the start winding is used to provide an initial boost of torque to help the motor overcome inertia and start turning. Once the motor achieves a specific speed, the centrifugal switch activates, cutting off the start winding. This is important because keeping the start winding engaged after the motor has started can cause overheating and damage to the winding.

This mechanism allows the motor to operate efficiently, using only the run winding for continuous operation, which reduces the risk of failure and ensures that the motor runs at its intended efficiency and performance levels.