Abstract
Motor Current signature analysis (MCSA) is a proven method for fault detection in induction motors. Usually, it is used classical techniques based on Fast Fourier Transform (FFT) or its extensions for MCSA. However, these techniques have disadvantages such as limitations in frequency resolution or time resolution, so it is difficult to know when a frequency component occurs, which is relevant for the study of non-stationary signals in the frequency domain. The present work presents the reassignment technique for the detection of broken rotor bar in induction motors fed with the line during the startup transient, which is tested with real signals, then the results are compared to the classic Short Time Fourier Transform (STFT); where it is obtained better resolution in time and frequency with the technique proposed compared with STFT, making possible to detect clearly when appear a frequency component related with the broken rotor bar fault.
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