Vibration analysis for bearing fault detection in electrical motors

Failure in rolling element bearings is most common failure type associated with electrical machines. Bearing faults results in failure of machine and eventually loss in productivity facility. Localised faults in bearing generate impulses in vibration signal due to impacts of rolling elements on races. Vibration signals for three conditions of ball bearing; 1) good, 2) having fault on outer race and 3) having combined fault one on outer race and one on ball were acquired. FFT and Discrete Wavelet Transform (DWT) using db02 were used for analysis.