Thèse soutenue

FR
Auteur / Autrice : Martin Blödt
Direction : Jean FaucherJérémi Régnier
Type : Thèse de doctorat
Discipline(s) : Génie électrique
Date : Soutenance en 2006
Etablissement(s) : Toulouse, INPT

Résumé

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EN

This Ph. D. Thesis deals with condition monitoring of mechanical failures in variable speed induction motor drives by stator current analysis. Two effects of a mechanical fault are considered: load torque oscillations and airgap eccentricity. The analytical modelling using the magnetomotive force and permeance wave approach leads to two stator current models. The fault provokes amplitude or phase modulation of the fundamental current component. Suitable detection methods are spectral analysis and parameter estimation in steady state whereas time-frequency analysis is required during transients. Instantaneous frequency estimation, the Wigner Distribution and the spectrogram are studied. Simulation and experimental results validate the theoretical approach. Automatic extraction of fault indicators is proposed for an unsupervised monitoring system.