DocumentCode :
1368899
Title :
Distinguishing Load Torque Oscillations and Eccentricity Faults in Induction Motors Using Stator Current Wigner Distributions
Author :
Blödt, Martin ; Regnier, Jérémi ; Faucher, Jean
Author_Institution :
Mobility Div., Siemens AG, Erlangen, Germany
Volume :
45
Issue :
6
fYear :
2009
Firstpage :
1991
Lastpage :
2000
Abstract :
This paper proposes a novel diagnosis method for detection and discrimination of two typical mechanical failures in induction motors by stator current analysis: load torque oscillations and dynamic rotor eccentricity. A theoretical analysis shows that each fault modulates the stator current in a different way: torque oscillations lead to stator current phase modulation, whereas rotor eccentricities produce stator current amplitude modulation. The use of traditional current spectrum analysis involves identical frequency signatures with the two fault types. A time-frequency analysis of the stator current with the Wigner distribution leads to different fault signatures that can be used for a more accurate diagnosis. The theoretical considerations and the proposed diagnosis techniques are validated on experimental signals.
Keywords :
Wigner distribution; fault diagnosis; induction motors; oscillations; rotors; spectral analysis; stators; time-frequency analysis; torque; current spectrum analysis; eccentricity faults; fault signatures; induction motors; load torque oscillations; mechanical failures; stator current Wigner distributions; stator current amplitude modulation; stator current analysis:; stator current phase modulation; time-frequency analysis; Condition monitoring; Wigner Distribution (WD); eccentricity; fault diagnosis; induction motor drives; load unbalance; motor current signature analysis; torque oscillation;
fLanguage :
English
Journal_Title :
Industry Applications, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-9994
Type :
jour
DOI :
10.1109/TIA.2009.2031888
Filename :
5238531
Link To Document :
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