Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 50-51, Issue -, Pages 400-413Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2014.05.017
Keywords
Induction motors; Conventional bispectrum; Modulation signal bispectrum; Motor current signal model; Broken rotor bar
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Funding
- National Natural Science Foundation of China [51375326, 51035008]
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Motor current signature analysis (MCSA) has been an effective way of monitoring electrical machines for many years. However, inadequate accuracy in diagnosing incipient broken rotor bars (BRB) has motivated many studies into improving this method. In this paper a modulation signal bispectrum (MSB) analysis is applied to motor currents from different broken bar cases and a new MSB based sideband estimator (MSB-SE) and sideband amplitude estimator are introduced for obtaining the amplitude at (1 +/- 2s)f(s) (s is the rotor slip and f(s) is the fundamental supply frequency) with high accuracy. As the MSB-SE has a good performance of noise suppression, the new estimator produces more accurate results in predicting the number of BRB, compared with conventional power spectrum analysis. Moreover, the paper has also developed an improved model for motor current signals under rotor fault conditions and an effective method to decouple the BRB current which interferes with that of speed oscillations associated with BRB. These provide theoretical supports for the new estimators and clarify the issues in using conventional bispectrum analysis. (C) 2014 Elsevier Ltd. All rights reserved.
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