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Open AccessArticle

Characterizing Sources of Small DC Motor Noise and Vibration

Division of Mechanical and Automotive Engineering, Kongju National University, ChunAn, ChoongNam 31080, Korea
Micromachines 2018, 9(2), 84; https://doi.org/10.3390/mi9020084
Received: 22 December 2017 / Revised: 9 February 2018 / Accepted: 13 February 2018 / Published: 15 February 2018
(This article belongs to the Special Issue Micro/Nano Robotics, Volume II)
Small direct current (DC) motors are widely used due to their low cost and compact structure. Small DC motors of various designs are available on the market in different sizes. The smaller the motor, the more closely it may be used by individuals. Contrary to the size and simplicity of these motors in terms of structural design, sources of motor noise and vibration can be quite diverse and complicated. In this study, the source of motor noise and vibration was visualized over a very wide range of frequencies. The particle velocity of the motor was reconstructed from nearfield sound pressure measurements of motor noise. In addition to noncontact measurements conducted on a motor running at constant speed, the particle velocity of a stationary motor due to the impulse of an impact hammer was measured with an accelerometer. Furthermore, motor noise was measured under motor run-up conditions with different rotational speeds. As a result, by combination of these three methods, the sources of motor noise were accurately identified over a wide range of frequencies. View Full-Text
Keywords: motor noise; micro motor; sound visualization; noise source identification motor noise; micro motor; sound visualization; noise source identification
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Cho, Y.T. Characterizing Sources of Small DC Motor Noise and Vibration. Micromachines 2018, 9, 84.

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