Axial Vibration and Humming of Small Induction Motors Equipped with Ball Bearings : 1st Report

概要

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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 row ball bearings. In addition to the vibrations, a kind of humming noise 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 a rotating mass of rotor and a 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 on the basis of the theory of elasticity and non-linear vibration. (3) The humming noise grows when the bending natural frequency of brackets is j/2 times of that of the vibration (j is a positive integer), and these cases correspond to the unstable region in Mathieu's vibratory system.
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