Monitoring and diagnostic of Induction Motors Stator Fault Based on Current Negative Symmetrical Component
Résumé
This study presents a survey of the diagnosis methods detecting the stator faults of the induction machines without modelling. The fault signature is based on the analysis of the negative sequence symmetrical component of the current. The present investigation carries out a comparative study of two different approaches. The first one results from the Discrete Fourier Transforms (DFT) and the Short Discrete Fourier Transforms (SDFT) while the second is based on numerical synchronous demodulation of the stator current vector. The induction machine is connected to a voltage source rich in harmonics (inverter or disturbed network). The suggested techniques are applied to the computing of the symmetrical component of negative sequence induced by a short circuit in a stator phase of an induction motor of 1.1 kW.