“…In the proposed method vibration signal alone analysed, whereas, in other techniques, more than one signal (vibration, current, speed and acoustic signal) is required for fault identification. The signal analysis algorithms used in the other methods are FFT [9], [12], STFT [41], Hilbert-Huang Transform (HHT) [11], DWT [28], [40] and absolute value-based principal component analysis (AVB-PCA) [15], which suffer from unstable Q-factor, whereas, in the proposed method RDWT (constant Q-factor) is utilized for signal analysis.…”