FEM approach for diagnosis of induction machines' non-adjacent broken rotor bars by short-time Fourier transform spectrogram

Panagiotis Panagiotou, Ioannis Arvanitakis, Neophytos Lophitis, Jose A. Antonino-Daviu, Konstantinos N. Gyftakis

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    Abstract

    Rotor electrical faults are an issue frequently encountered when applying condition monitoring and fault diagnosis on induction machines. The detection via the analysis of the stator current becomes challenging when the rotor cage suffers from multiple breakages at non-adjacent positions. In that case, electromagnetic asymmetries induced by the broken bars can be masked in such a way, that the diagnostic ability is highly likely to be obscured, thus leading to misinterpretation of the monitored signals’ signatures. A new approach is proposed in this work to overcome this problem while the motor is at steady state. In this paper, an industrial 6.6kV, 1.1MW induction motor is simulated with Finite Element Analysis (FEM) and its electromagnetic variables are analysed and studied under healthy state and several faulty conditions. The analysis of the stator current and stray flux waveforms is executed in both the transient and the steady state and aims to diagnose the challenging cases where the rotor breakages are nonconsecutive with regards to their spatial location. The results show the potential of flux analysis to fault severity regardless of the spatial position of the broken bars.
    Original languageEnglish
    Pages (from-to)4566-4570
    Number of pages5
    JournalThe Journal of Engineering
    Volume2019
    Issue number17
    Early online date14 May 2019
    DOIs
    Publication statusPublished - 17 Jun 2019
    Event9th International Conference on Power Electronics, Machines and
    Drives
    - Liverpool, United Kingdom
    Duration: 17 Apr 201819 Apr 2018
    https://events2.theiet.org/pemd/index.cfm?utm_source=redirect&utm_medium=legacyredirects&utm_campaign=2019relaunch&utm_source=redirect&utm_medium=any&utm_campaign=pemd

    Bibliographical note

    This is an open access article published by the IET under the Creative Commons
    Attribution License
    (http://creativecommons.org/licenses/by/3.0/)

    Keywords

    • Broken rotor bars
    • Non-adjacent
    • Spectrogram

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