Abstract

Electromagnetic force calculated by 2-dimensional analysis is transformed into exciting force for 3-dimcnsional structural-vibration analysis. And a procedure for modeling a vibrating structure is developed. Furthermore, a space-modal-resonance criterion, which relates electromagnetic force to structural vibration or noise, is introduced. In the structural-vibration analysis, the finite clement method is used; and in the noise analysis, the boundary element method is used. And vibration and noise of an induction motor are evaluated by using this criteria. Consequently, high-accuracy modeling is achieved and calculated noise almost completely coincides with that measured by experiments. And it is clarified that the-space-modal resonance criterion is effective on numerical simulation.

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