Abstract
When a small induction motor with ball bearings is running under no load, an abnormal axial vibration of the rotating shaft often occurs. This vibration was studied in order to elucidate the generating mechanism. The test motor was operated at constant temperature, and the rotating shaft speed was varied by changing the frequency of an inverter. The vibration was measured by an eddy current type gap sensor, and was analyzed by an FFT analyzer. From the experimental results and related considerations, the vibratory system and the exciting force and self-exciting force that act upon the system were examined. It is clear that the abnormal vibration is a forced self-excited vibration of the vibratory system with an axial nonlinear spring due to ball bearings.
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