Induction motor mixed fault diagnosis based on wavelet analysis of the current space vector

Broken bars and eccentricity are common faults in induction motors. These two faults usually occur simultaneously, since most installed induction motors have a small inherent eccentricity. In this paper a detailed investigation of the possibilities for induction motor fault diagnosis based on wavelet analysis of the current space vector is provided. The main objective is to formulate a method for enhanced diagnosis of broken rotor bars in induction motors by applying wavelet analysis to the motor current space vector. To this purpose, a detailed wavelet analysis of stator current space vector is implemented. The analysis is at first performed through simulation of a faulty asynchronous machine in Matlab-Simulink. Subsequent to the simulation results analysis, experimental tests were conducted. Characteristic results are presented and briefly discussed