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M. Arata,N. Takahashi,M. Fujita,M.Mochizuki,T.Araki,T.Hanai 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
According to electrical output up rating of a permanent magnet motor and request to operate for a large variable speed range, resonance between structural natural vibration and electromagnetic force inside the motor can take place and make noise. This paper describes the mechanism of a resonance between them and noise lowering procedure by frequency shift when they are applied to the reluctance torque largely employed new motor named Permanent magnet Reluctance Motor (PRM).