The influence of the occurrence frequency upon the radial distribution of electromagnetic vibration and noise in a three-phase squirrel-cage induction motor

The reduction in the electromagnetic vibration and noise in three-phase squirrel-cage induction motors (IMs) has become very important from an environmental standpoint. Although electromagnetic vibration in IMs has been studied for several years, the relationship between the electromagnetic force and the radial distributions of the resulting electromagnetic vibration and noise has not yet been analyzed in sufficient detail. Our results clearly show that the radial distributions of the dominant electromagnetic vibration and noise components caused by an IM under load conditions match the mode shape of the dominant electromagnetic force producing these components.