Electric motor noise: How to identify the cause and implement a ...
WEBMay 12, 2021 · Running the motor at reduced voltage is a simple diagnostic tool. For example, if the motor is noisy at full voltage but sounds fine at half of rated voltage, focus on the air gap and such issues as mismachined housing or an eccentric rotor. Causes of an unequal air gap are: Eccentric rotor. Eccentric stator.