What must occur for a part-winding starter to function correctly at startup?

For a part-winding starter to function correctly at startup, only one set of coils needs to be connected. This is crucial because a part-winding starter is designed to limit the starting current of the motor by using only a portion of the motor's windings initially. By connecting only one set of coils, the motor begins to accelerate with reduced voltage and current, which helps prevent excessive electrical and mechanical stress during startup.

Once the motor reaches a certain speed, the second set of coils can be switched in to allow the motor to operate at full power. This method is particularly beneficial for large motors, enabling a smoother and more controlled startup process.