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– Reduction of electromagnetic vibration and acoustic noise from three-phase squirrel-cage induction motors (IMs) is very important, particularly from the standpoint of environmental considerations. Although the electromagnetic vibration of IMs has been studied for several years, the relationships between the radial distribution of the electromagnetic vibration and noise and the electromagnetic forces responsible for them have not yet been analyzed in sufficient detail. In the present study, we investigated this relationship experimentally for a small IM under different load conditions. Our results clearly show that the radial distributions of the dominant electromagnetic vibration and noise components match the mode shape of the dominant electromagnetic force producing these components. Keywords: I nd uct iomr,N se Vb aH fl x. 1. Introduction In recent years, the demand for induction motors (IMs) with low noise characteristics has increased considerably owing to environmental considerations. The basic concepts of IMs have been clarified through numerous studies [1]. However, the relationships between the radial distributions of the electromagnetic vibration and noise and the force waves responsible for them have not yet been analyzed in sufficient detail. In this paper, we present the results of an experimental investigation into the radial distributions of the electromagnetic vibration and noise generated by an IM under various load conditions. First, we list the occurrence frequency and mode of the dominant electromagnetic force generated by the interaction of the harmonic fluxes in the IM gap. Next, we describe the experimental methods. Finally, on the basis of the results from several trials, we show that the radial distributions of the dominant electromagnetic vibration and noise components clearly correspond to the mode shape of the dominant electromagnetic forces.

Basic Study of Radial Distributions of Electromagnetic Vibration and Noise in Three-Phase Squirrel-Cage Induction Motor under Load Conditions