New vision about the overlap frequencies in the MCSA-FFT technique to diagnose the eccentricity fault in the induction motors

Abstract

This paper presents a new precise vision to diagnose the eccentricity fault using the motor current signature analysis technique (MCSA). The MCSA method was based on analyzing the FFT of the stator current. But, it has many disadvantages, as operating regimes (non-stationary) or his suffering to distingue the characteristic frequencies of several faults such as short circuit, eccentricity, broken rotor bars, etc. Our study will clarify the essential points of overlap in this method under static and dynamic eccentricity fault (SE and DE). This study proposes a development of the new formulas which precisely shows the overlap between the frequencies. According to MCSA method, we treated their problems in detail for eccentricity fault in the induction motors, while being based on the stator current spectrum. In this paper, experimental results were exploited under static and dynamic eccentricity fault.