Dynamics & Design Conference
Online ISSN : 2424-2993
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変調を伴う電磁加振力による音響放射部の振動特性について
*北尾 尚大堀 龍平笹本 芽依高橋 政行大石 久己
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Fan motors are used for cooling various devices such as PCs and data servers. Fan motors generally use inverters to control rotation speed for the purpose of energy saving and variable speed. However, the pulse width modulation control of the inverter is a source of excitation, and the radiation noise of the fan motor, whose fundamental frequency is the carrier frequency, becomes a problem. To solve this problem, modulation of the electromagnetic excitation force is used, but the actual change in noise is often not sufficient to improve the sound quality. Therefore, this study confirms the characteristics of resonance phenomena caused by CF in PWM control using noise tracking analysis and ODS analysis using a laser Doppler vibrometer.

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