Journal Published Online: 22 May 2014
Volume 42, Issue 4

Monitoring the Aging of Industrial Motors by Geometric Trending of Frequency Domain Signatures



The characterization of the aging of electric motors using vibration measurements and a geometric interpretation of spectral domain signatures is presented. For comparison, two vibration signal records from a three-phase induction motor were acquired during degradation due to bearing fluting, following thermal and chemical aging sequences. Power spectral densities (PSD) of the vibration signals were calculated and linear approximations to the spectral signatures were used to observe the overall trend. The intersection point and slopes of these linear representations were used to extract certain critical frequencies in order to define convex regions (CR) and convex hulls (CH) as representatives of the aging (degradation) process. Furthermore, using these CRs and CHs, the functional readiness of motors could be determined by comparison of the signatures for initial and aged conditions.

Author Information

Bayram, Duygu
Istanbul Technical Univ., Electrical Engineering Department, Istanbul, TR
Şeker, Serhat
Istanbul Technical Univ., Electrical Engineering Department, Istanbul, TR
Upadhyaya, Belle
Univ. of Tennessee, Nuclear Engineering Dept., Knoxville, TN, US
Pages: 10
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Stock #: JTE20130086
ISSN: 0090-3973
DOI: 10.1520/JTE20130086