The start winding of a split-phase motor does what?

The start winding of a split-phase motor is designed to be more electrically resistant, which is typically achieved by having more turns of wire compared to the run winding. This higher resistance and increased number of turns create a phase shift between the two windings when voltage is applied, enabling the motor to develop the necessary starting torque.

Once the motor reaches a certain speed, a centrifugal switch or relay typically disconnects the start winding from the circuit, allowing the run winding to take over. This operational mechanism allows the motor to start quickly and efficiently, with the start winding being crucial during the initial phase of operation.

The distinctions among the windings, particularly the number of turns and their configuration, are critical for the effective operation of the motor, and understanding this helps with diagnosing issues related to motor performance and efficiency.