Noise in induction motors-causes and treatments

This work consists of three parts. The first part identifies causes and frequencies of windage and magnetic noise in an induction motor. Specific problems that are unique to various motors are also identified. In the second part, a testing procedure is established that can be followed to determine the full load noise level of an induction motor. Also included is a testing procedure to determine the nature and origin of the noise so that it can be treated in the proper manner. In the third part of the work, the most effective methods of reducing motor noise levels in the field and at the factory are discussed