Authors
Abstract
A stator current measurement has an important role in condition monitoring and fault diagnosis of induction motors. For instance, the eccentricity, rotor bars and end ring breaks, shorted stator windings can be detected by analyses based on stator current measurement. This paper addresses the application of stator current spectral analysis technique for the detection and localization of abnormal electrical and mechanical conditions that indicate, or may lead to, a failure of the induction motors. The effects of stator current spectrum are described and the related frequencies are determined. In the present investigation, the frequency signatures of some asymmetrical motor faults are well-identified using signal processing techniques, such as Welch method for spectral density estimation. In fact, experimental results clearly illustrate that stator current spectral analysis using Welch method is a very good tool to detect faults in induction motors. These faults are shaft speed oscillation, eccentricity, broken rotor bar, and end ring cracked.
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