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INDUCTION MOTOR ROTOR CAGE FAULT DIAGNOSIS WITH STOCKWELL AND WAVELET TIME-FREQUENCY STATOR CURRENT ANALYSIS

This article presents ways of identifying induction motor rotor cage fault using Stockwell case analysis and Wavelet transform of the stator start-up current. Faults are simulated by the mathematical model of the three-phase induction machine. That specific induction machine has 28 rotor cage bars. It is shown that time-frequency analysis (that highlights the time variation concerning a stator current) allows an accurate identification of broken bars. This identification is done with both the Wavelet and the Stockwell transform, in order to compare efficiency.