自動車用直流モータの高周波騷音の解析と低減

概要

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An increasing number of automotive direct-current motors, which emit high-frequency noise (20〜10kHz), are being incorporated into automobiles. This paper presents an experimental analyis of factors effecting the noise and how to control the factors to reduce the noise. An experimental device is contrived to drive the detached motor set by rare-earch magnetic coupling and to investigate the factors separately. Magnetization of the permanent magnet and commutation of the commutator are causes of the noise. Increase of clearance between the brush and the brush holder, surface roughness of the commutator, and brush pressure force, and decrease of the brush contact area on the commutator increase the motor noise. A countermeasure which reduces the noise by 5〜10dB(A)in 4〜8kHz is presented, wherein the overall noise reduction of 5dB(A) is achieved.
一般社団法人日本機械学会の論文
1993-11-25