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Diagnosis of eccentricity in induction machines working under fluctuating load conditions, through the instantaneous frequency

Vedreno-Santos, F.; Riera-Guasp, M.; Henao, H.; Pineda-Sanchez, M.; Antonino-Daviu, J. A.


M. Riera-Guasp

H. Henao

M. Pineda-Sanchez

J. A. Antonino-Daviu


This paper introduces a methodology for diagnosing
mixed eccentricity fault in squirrel cage induction machines
which work under variable load conditions in generator or motor
mode; the method is based on the extraction of the instantaneous
frequency of the fault related component of stator currents
during speed transients, caused by load changes. It is shown that
under these conditions, the instantaneous frequency plot of the
main fault component versus the slip is a straight line with a
specific slope and offset. In addition and for a given pole pair
number, this pattern is not dependent on the machine features,
nor the way in which the load changes. Besides, the practical
methodology of this technique is introduced for diagnosing mixed
eccentricity. The approach is validated by laboratory tests

Conference Name IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society
Start Date Oct 25, 2012
End Date Oct 28, 2012
Online Publication Date Dec 24, 2012
Publication Date 2012-10
Deposit Date Oct 5, 2016
Publisher Institute of Electrical and Electronics Engineers
Book Title IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society
ISBN 9781467324212; 9781467324199; 9781467324205
Keywords Analytical signal; discrete wavelet transform; fault diagnosis; Hilbert transform; induction machine; instantaneous frequency; load fluctuating conditions; Timefrequency analysis; wind generation
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