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The Study on the Vibration and Noise Characteristics Caused by Electromagnetic Force of the Fan Motor with the Offset in the Axial Direction

Masaki Ogushi 1, Koki Shiohata 2, Zhong Yan 1, Atsushi Taroda 1, Takako Otsuka 1, Yasuhiro Ikehara 1, and Yoichi Kawai1
1. Minebea Co., Ltd. Electric Device & Component Manufacturing HQ, Fukuroi-shi, Japan
2. Ibaraki University, Hitachi-shi, Japan

Abstract—Fan motors are used in many equipments. Common requirements for the fan motors are high efficiency, high air capacity, and low vibration and noise. Recent changes in many people’s lifestyle brought up reduction and noise of fan motors as an important issue. In this study, features on the vibration and noise in the axial direction were explained, and resonance frequency between electromagnetic force and structural natural frequency were investigated by numerical simulation. First, equations of motion for the fan motor were expressed. And a 3-D model was build, and electromagnetic forces (in the radial, tangential and axial direction) were calculated. Next, a 3-D model for structural vibration was build, and vibration characteristics were calculated. Finally, resonance phenomena caused by harmonics of the electromagnetic force that occurred in the fan motor in the axial direction were clarified.

Index Terms—rotary machinery, fan motor, noise, vibration of mechanism, electromagnetic induced vibration, natural frequency

Cite: Masaki Ogushi, Koki Shiohata, Zhong Yan, Atsushi Taroda, Takako Otsuka, Yasuhiro Ikehara, and Yoichi Kawai, "The Study on the Vibration and Noise Characteristics Caused by Electromagnetic Force of the Fan Motor with the Offset in the Axial Direction," International Journal of Electrical Energy, Vol. 4, No. 3, pp. 152-158, September 2016. doi: 10.18178/ijoee.4.3.152-158

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