Rotor fault detection using the instantaneous power signature

The aim of this paper is to present a method to detect broken rotor bar faults by estimating a global modulation index which corresponds to the contribution of all detected modulating frequencies in the stator current. We show that additional information carried by instantaneous power improves the detection of the sidebands and consequently the monitoring too. In fact, the instantaneous power method can be interpreted as a modulation operation in the time domain that translates the spectral components specific to the broken rotor bars to the band [0-50]Hz.