Condition monitoring of mechanical faults in variable speed induction motor drives : application of stator current time-frequency : analysis and parameter estimation
作者： Martin Blödt
DOI:
关键词: Control engineering 、 Fault (power engineering) 、 Stator 、 Instantaneous phase 、 Magnetomotive force 、 Induction motor 、 Engineering 、 Spectrogram 、 Steady state (electronics) 、 Control theory 、 Condition monitoring
摘要: This Ph.D. thesis deals with condition monitoring of mechanical failures in variable speed induction motor drives by stator current analysis. Two effects a fault are considered: load torque oscillations and airgap eccentricity. The analytical modelling using the magnetomotive force permeance wave approach leads to two models. provokes amplitude or phase modulation fundamental component. Suitable detection methods spectral analysis parameter estimation steady state whereas time-frequency is required during transients. Instantaneous frequency estimation, Wigner Distribution spectrogram studied. Simulation experimental results validate theoretical approach. Automatic extraction indicators proposed for an unsupervised system. Moreover, dynamic eccentricity can be discriminated methods. feasibility on-line system demonstrated DSP implementation including indicator extraction.
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