玉軸受を使用した電動機に生ずる異常振動およびうなり音(第1報)

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タイトル別名
  • Axial Vibration and Humming of Small Induction Motors Equipped with Ball Bearings (1st Report)
  • タマジクウケ オ シヨウ シタ デンドウキ ニ ショウズル イジョウ シンドウ オヨビ ウナリ オン 1

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抄録

When small induction motors equipped with rolling bearings are running under no load, abnormal axial vibrations of a rotating shaft appear often, and especially most frequently in the case of single raw ball bearings. In addition to the vibrations, a kind of humming grows. The authors analyzed these phenomena and obtained certain results as follows : (1) The axial vibration is a free vibration of a system composed of rotating mass of the motor and non-linear spring for axial direction of ball bearings. In this spring character, two kinds of region exist, one is symmetric, the other asymmetric. (2) The frequency of the vibration in the symmetrical non-linear spring region can be calculated basing on the theory of elasticity and nonlinear vibration. (3) The humming grows, when the bending natural frequency of the brackets is j/2 times of that of the vibration (j is a positive integer), and these cases correspond to the unstable region in the Mathieu's vibratory system.

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