FBG-T Sensor for Non-intrusive Broken Rotor Fault Severity Detection in Induction Machines

Belema Alalibo*, Wen ping Cao, Bing Ji, Adenowo Gbadebo, Kaiming Zhou

*Corresponding author for this work

Research output: Chapter in Book/Published conference outputConference publication


Fiber bragg gratings (FBG) as optical sensors continue to gain increasing relevance in sensing and instrumentation owing to their numerous advantages including immunity to electromagnetic interference (EMI). This paper experiments on the use of a giant magnetostrictive material, Terfenol-D bonded to an FBG hereafter called FBG-T to detect external flux from electrical machines in a non- invasive manner. A DC motor and two identically rated three phase induction motors, FBG-T were used for rotor cage damage detection in this work. Further damage to the faulty rotor was carried out to observe if the FBG-T would distinguish severity in machine fault condition. Results show that the more severely faulted machine experienced the most Braggshift of about 20 pm more than the healthy machine at 5 Hz, compared to the less severely faulted machine which showed about 15 pm more than the healthy machine. Another striking observation was the consistency in the distinct and deviant path followed by both faulty motor conditions when compared to the healthy motor. The more severe the rotor damage fault was, the larger the divergence from the healthy motor signature. The results do show that the faulty machine with the broken rotor consistently recorded more Bragg shifts than the healthy motor at all frequencies. This resulted in a distinct and aberrant sensing profile which detects the fault in a non-intrusive manner. In addition to observed bragg shifts, divergence levels in grating profile from the healthy reference condition was used to succinctly detect the fault severity in the induction motor condition. This is hugely significant because of the non-intrusive nature of the technique given the ease-of-breakage and the challenges faced when FBG installed in machine stator slots are to be replaced. This technique easily overcomes the inevitable requirements of the offline FBG replacement and its associated economic costs including downtime.

Original languageEnglish
Title of host publicationConference Proceedings of 2021 International Joint Conference on Energy, Electrical and Power Engineering
Subtitle of host publicationComponent Design, Optimization and Control Algorithms in Electrical and Power Engineering Systems
EditorsWenping Cao, Cungang Hu, Jun Tao, Xiaoyan Huang, Xiangping Chen
ISBN (Electronic)9789811931710
ISBN (Print)9789811931703
Publication statusPublished - 13 Oct 2022
EventInternational Joint Conference on Energy, Electrical and Power Engineering , CoEEPE 2021 - Frankfurt, Germany
Duration: 17 Sept 202119 Sept 2021

Publication series

NameLecture Notes in Electrical Engineering
ISSN (Print)1876-1100
ISSN (Electronic)1876-1119


ConferenceInternational Joint Conference on Energy, Electrical and Power Engineering , CoEEPE 2021

Bibliographical note

Copyright © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. This version of the paper has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use [https://www.springernature.com/gp/open-research/policies/accepted-manuscript-terms], but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/978-981-19-3171-0_14


  • External flux
  • FBG
  • Non-invasive
  • Severity
  • Terfenol-D


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