Recently, global warming and the problems with incorporating environmental safeguards have promoted the need for a more power-efficient motor. Therefore, as a driving source, permanent magnet synchronous motor (PMSM) is widely used as an important device for a variety of fields. However, a PMSM generates electromagnetic vibration when driven by PWM inverters. This paper describes the frequency of the electromagnetic vibration of a PMSM with a distributed winding. We investigated the electromagnetic force by analyzing a circuit simulator using two-dimensional finite element analysis. It is found that the electromagnetic vibration resulted from electromagnetic force of the zeroth order of space harmonics. In addition, electromagnetic vibration mode of this order is confirmed in experiment.
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