DWT based bearing fault detection in induction motor using noise cancellation

This paper presents an approach to detect the bearing faults experienced by induction machine using motor current signature analysis (MCSA). At the incipient stage of bearing fault, the current signature analysis has shown poor performance due to domination of pre fault components in the stator current. Therefore, in this paper domination of pre fault components is suppressed using noise cancellation by Wiener filter. The spectral analysis is carried out using discrete wavelet transform (DWT). The fault severity is estimated by calculating fault indexing parameter of wavelet coefficients. It is further proposed that, the fault indexing parameter of power spectral density (PSD) based wavelet coefficients gives better results. The proposed method is examined using simulation and experiment on 2.2 kW test bed