On-Line Monitoring of Mechanical Faults in Variable-Speed Induction Motor Drives Using the Wigner Distribution
Blodt, M.
Bonacci, D.
Regnier, J.
Chabert, M.
Faucher, J.
Inst. Nat. Polytech. de Toulouse, Toulouse;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb. 2008
Volume: 55,
Issue: 2
On page(s): 522-533
ISSN: 0278-0046
INSPEC Accession Number: 9748388
Digital Object Identifier: 10.1109/TIE.2007.911941
Current Version Published: 2008-01-31
Abstract
This paper deals with the detection of mechanical load faults in induction motors during speed transients. The detection strategy is based on stator current analysis. Mechanical load faults generally lead to load torque oscillations at specific frequencies related to the mechanical rotor speed. The torque oscillations produce a characteristic sinusoidal phase modulation of the stator current. Speed transients result in time-varying supply frequencies that prevent the use of classical, Fourier transform-based spectral estimation. This paper proposes the use of a time-frequency distribution, the Wigner Distribution, for stator current analysis. Fault indicators are extracted from the distribution for on-line condition monitoring. The proposed methods are implemented on a low-cost digital signal processor. Experimental results in a steady-state and during transients with load torque oscillations and load imbalance are presented.
Index
Terms
Available to subscribers and IEEE members.
References
Available to subscribers and IEEE members.
Citing Documents
Available to subscribers and IEEE members.
Cart
