Stator Winding Internal Thermal Monitoring and Analysis Using in-situ FBG Sensing Technology

Sinisa Durovic, Anees Mohammed

    Research output: Contribution to journalArticlepeer-review


    This paper reports a novel thermal monitoring scheme for on-line internal temperature measurement in low voltage random wound machine stator windings. The scheme is based on utilising electrically non-conductive and electromagnetic interference immune fibre optic sensing technology embedded in close proximity of hot spots of interest to create a robust distributed thermal monitoring network within the machine windings. The key design and implementation features of the proposed system are presented and applied on a prototype mains-fed induction motor. The on-line thermal monitoring performance is examined in a number of typical continuous and periodic running duty tests, as defined by the relevant IEC standards for rating and performance of rotating electrical machines. It is shown that the presented scheme has the potential to provide competent on-line measurement of critical machine thermal hot spots that are largely beyond effective reach of conventional thermal monitoring solutions. Furthermore, the proposed scheme underpins a higher fidelity understanding of the distribution and propagation of winding thermal stress, demonstrated by the experimental analysis reported in the paper.
    Original languageEnglish
    Pages (from-to)1508-1518
    Number of pages11
    JournalIEEE Transactions on Energy Conversion
    Issue number3
    Publication statusPublished - 18 Apr 2018


    • FBG sensor
    • Induction motor
    • internal stator winding temperature
    • on-line thermal monitoring


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