What is the correct configuration for wye windings during motor operation?

In three-phase induction motors, wye (Y) windings are a common configuration used for both starting and running conditions. During the start phase, the motor requires a high starting torque, which is effectively achieved when connected in wye. This arrangement allows for a lower phase voltage and, as a result, a reduced starting current. Additionally, the wye configuration helps manage the electrical characteristics of the motor, enabling it to transition smoothly into operation.

Once the motor reaches a certain speed, it can operate efficiently in the wye configuration during the run phase as well, allowing for stable and effective performance. The advantages of this winding configuration persist throughout both phases, contributing to the versatility and efficiency of the motor across different operational states.

While the idling phase is not typically characterized by the same load conditions as start or run phases, the wye configuration still plays a role in maintaining balance during these lower load conditions. However, the specific context of the question focuses on the operational phases, making the indication of both start and run phases as the most relevant and accurate choice.