Induction motor rotor fault diagnosis using three-phase current intersection signal

This paper presents a simple and reliable improved method based on the three-phase current intersection signal (TPCIS), for induction motor rotor fault diagnosis. This method consists of finding time and amplitude of intersection points instead of using the traditional zero-crossing-time technique. TPCIS is constructed by searching and interpolating the positive and negative crossing points of the three-phase currents. After that, a spectral analysis of this signal is performed to extract the rotor fault signature. The proposed method is theoretically introduced and experimentally validated by testing three induction machines under different load conditions. The experimental results show the effectiveness of the proposed method in identifying the examined defect even under low-load conditions.