Is it true that typical single phase induction motors have a start winding that disconnects shortly after startup?

Typical single-phase induction motors are designed with a start winding that is essential for initiating rotation. This start winding provides the necessary phase shift for the motor to start up effectively. Once the motor reaches a certain speed, a centrifugal switch or relay detects the increase in speed and disconnects the start winding from the circuit. This disconnection is crucial because keeping the start winding energized for prolonged periods could lead to overheating and potential damage to the motor.

The disconnection feature is standard in many designs of single-phase induction motors, allowing them to operate efficiently after the initial startup phase. This characteristic is what makes the statement true, confirming that the start winding is only needed for a brief moment during startup and is disconnected shortly thereafter to ensure the longevity and efficiency of the motor.