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World Electric Vehicle Journal is published by MDPI from Volume 9 issue 1 (2018). Articles in this Issue were published by The World Electric Vehicle Association (WEVA) and its member the European Association for e-Mobility (AVERE), the Electric Drive Transportation Association (EDTA), and the Electric Vehicle Association of Asia Pacific (EVAAP). They are hosted by MDPI on as a courtesy and upon agreement with AVERE.
Open AccessArticle

Torsional Resonance Noise Reduction by Motor Torque Phase Adjustment

TOSHIBA CORPORATION, 2-4, Suehiro-cho, Tsurumi-ku Yokohama, Kanagawa, 230-0045, Japan
Toshiba Industrial Products Manufacturing Co.
Author to whom correspondence should be addressed.
World Electr. Veh. J. 2012, 5(2), 527-532;
Published: 29 June 2012
PDF [156 KB, uploaded 17 May 2018]


A Hybrid Vehicle (HEV) and an Electric Vehicle (EV) are some of solutions to improve efficiency of a cruse and to reduce CO2 gas by regenerative breaking and operating the engine in optimum condition. It is requested to decrease the motor size and to increase the maximum torque for minimizing the driving units. For these purposes permanent magnet applied motors have been commonly used recently. The motor driving systems of HEV or EV must operate at variable speed ranges of up to 1:5. For this large range, Silent and smooth operations are desirable and important. Skew method is often adopted to ensure smooth start and stop and silent operation by reducing the torque ripple. But it possibly causes noise and vibration of the motor. This paper describes the mechanism of torsional resonance noise and vibrations arising from the skew method and the countermeasure to decrease them.
Keywords: AC motor; EV; HEV; noise AC motor; EV; HEV; noise
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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MDPI and ACS Style

Arata, M.; Takahashi, N.; Mochizuki, M.; Araki, T.; Hanai, T. Torsional Resonance Noise Reduction by Motor Torque Phase Adjustment. World Electr. Veh. J. 2012, 5, 527-532.

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