Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 45, Issue 6, Pages 1991-2000Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2009.2031888
Keywords
Condition monitoring; eccentricity; fault diagnosis; induction motor drives; load unbalance; motor current signature analysis; torque oscillation; Wigner Distribution (WD)
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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.
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