BEARING FAULT DIAGNOSIS METHOD OF INDUCTION MOTOR VIA WAVELET DECOMPOSITION OF PARK'S VECTOR MODULUS SIGNAL
Leping Bu · Proceedings of the CSEE · 2005
By analyzing the frequency separation characteristic of Wavelet Packet Decomposition (WPD),a general expression is given to decide the sequence of WPD sub-band at the same level from low to high frequencies.An induction motor experiment with the known faults of bearing was done.Then the RMS values of the WPD coefficients of Park's Vector Modulus signals of the three-phase current was calculated,and could be the symptom of bearing fault.The experimental and the calculated results demonstrated that the influences of the fundamental frequency current as well as the noises in current were reduced.The limitation to extract the fault characteristic frequency resulting from the fluctuation of the characteristic frequency and the variation of the load is overcome.