What role does the start switch play in split-phase motors?

The role of the start switch in split-phase motors is to initiate the start of the motor. In these types of motors, the start switch enables the application of power to the starting winding, which generates a magnetic field that helps the rotor begin to turn. Once the motor reaches a certain speed, usually around 70-80% of its rated speed, the start switch typically opens and disconnects the starting winding from the circuit, allowing the motor to run on the main winding alone. This initial action is crucial for getting the rotor moving and ensuring that the motor operates properly during startup.

The other functions mentioned, such as disconnecting power, regulating speed, or maintaining energy efficiency, do not directly pertain to the primary function of the start switch in split-phase motors. The switch is fundamentally designed to facilitate the startup process, providing the necessary conditions for the motor to begin operating.