Abstract
In this study, we propose a diagnosis method for the rotor eccentricity in induction machines fed by a PWM converter by considering the harmonics in a transient magnetic phenomenon. The influences of the asymmetrical whirling motions are studied using the back EMF of a search coil, which enables the detection of motor faults. The analysis results of the rotor eccentricity could be obtained by comparing the characteristics of motors fabricated with normal and irregular air gaps, and the validity is verified from the experimental results. The simulation and experimental results can be useful for the online faults detection monitoring system of induction machines.
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