Induction motor mechanical fault simulation and stator current signature analysis

This paper addresses the simulation of induction machines with mechanical faults and the fault signature analysis of stator current. Models for three-phase induction motors with broken rotor bars by winding function method are developed. Current waveforms of an induction motor under normal and faulty conditions are simulated. New feature coefficients for signature analysis of the stator current are proposed based on the wavelet packet decomposition. The feature coefficients are calculated for both normal and fault conditions. If is shown that for most load conditions the new feature coefficients for fault cases are distinctive from normal conditions at certain depth and nodes. The features proposed here can be used for induction motor fault detection and diagnosis.