What does the centrifugal switch in a split-phase motor do?

The centrifugal switch in a split-phase motor plays a crucial role in managing the operation of the motor, specifically regarding the start and run windings. Its primary function is to disconnect the start winding from the power supply once the motor reaches a certain speed. This is essential because the start winding is used to get the motor up to speed, and once that speed is achieved, it is no longer needed for the motor to operate efficiently. Keeping the start winding connected would lead to unnecessary heating and potential damage to the winding.

The centrifugal switch is activated by the centrifugal force generated by the motor's rotation. As the motor accelerates, the speed builds up to a point where the switch opens, effectively removing the start winding from the circuit. This allows the motor to continue running smoothly and efficiently using only the run winding.

This function highlights the importance of the centrifugal switch in the overall design and efficiency of split-phase motors, ensuring smooth operation without unnecessary wear on components.