volume | PIER Journals

Abstract

This paper investigates the effects of the step-skew rotor on electromagnetic vibration performance of a 72-slot/12-pole interior permanent magnet synchronous machine (IPMSM) considering the carrier sideband current harmonics. Firstly, the effect of the step-skew rotor on carrier sideband current harmonics generated by the space vector pulse-width modulation technique is investigated. Second, the interaction electromagnetic field near the first carrier frequency of the 72-slot/12-pole IPMSM is analytically investigated. The effects of the step-skew rotor on the electromagnetic force at low-medium and carrier frequency domain are discussed. The force modulation effect is also considered to investigate the effects of the step-skew rotor on the 72nd-order force and the zeroth mode vibration. Finally, the vibration responses of two IPMSMs with and without the step-skew rotor are simulated to validate the suppression effect of this structure on the 72nd-order force. The simulation results demonstrate that the step-skew rotor design effectively reduces vibration acceleration by 75.7% at 12 times of the fundamental frequency and 30.4% at carrier sideband frequency.

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Dr. Zhi Xu

Dr. Shunqing Xu

Dr. Dandan Liu

Dr. Zhishu Yao