Experimental diagnosis of broken rotor bars fault in induction machine based on Hilbert and discrete wavelet transforms

In this paper, a diagnosis method based on Hilbert and discrete wavelet transform (DWT) for broken rotor bars in induction machine has been proposed. The method is based from using Hilbert transform (HT) to obtain the envelope for the stator current and processed via DWT. The main advantage of HT is the removal of the fundamental component to allow a clearer vision of the fault frequencies. The result by HDWT (HT and DWT) is more suitable for emergency signal analysis. This technique is effective for the stationary signal as well as non-stationary signal processing. The HDWT analysis was introduced to overcome the shortcomings of Fourier analysis. The performance of this approach is evaluated in simulation and experimental results.

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