Mechanical Load Fault Detection in Induction Motors by Stator Current Time-Frequency Analysis

This paper examines the detection of mechanical faults in induction motors by an original use of stator current time-frequency analysis. Mechanical faults lead generally to periodic load torque oscillations. The influence of the torque oscillations on the induction motor stator current is studied us...

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Bibliographic Details
Published inIEEE transactions on industry applications Vol. 42; no. 6; pp. 1454 - 1463
Main Authors Blodt, M., Chabert, M., Regnier, J., Faucher, J.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.11.2006
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Equivalence
Fault detection
Faults
Frequency estimation
Induction motor fault diagnosis
Induction motors
load unbalance
mechanical fault
Oscillations
Phase modulation
Signal analysis
Signal processing
Spectra
Spectral analysis
Stators
Time frequency analysis
Torque
torque oscillations
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Summary:This paper examines the detection of mechanical faults in induction motors by an original use of stator current time-frequency analysis. Mechanical faults lead generally to periodic load torque oscillations. The influence of the torque oscillations on the induction motor stator current is studied using an analytical approach. The mechanical fault results in a sinusoidal phase modulation of the stator current, which is equivalent to a time-varying frequency. Based on these assumptions, several signal processing methods suitable for stator current signature analysis are discussed: classical spectral analysis, instantaneous frequency estimation, and the Wigner distribution. Experimental and simulation results validate the theoretical approach in steady-state operating conditions
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ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2006.882631