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Investigation of Permanent Magnet Demagnetization in Synchronous Machines during Multiple Short-Circuit Fault Conditions

Author

Listed:
  • Stefan Sjökvist

    (The Division of Electricity, Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden)

  • Sandra Eriksson

    (The Division of Electricity, Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden)

Abstract

Faults in electrical machines can vary in severity and affect different parts of the machine. This study focuses on various kinds of short-circuits on the terminal side of a generic 20 kW surface mounted permanent magnet synchronous generator and how successive faults affect the performance of the machine. The study was conducted with the commercially available finite element method software COMSOL Multiphysics ® , and two time-dependent models for demagnetization of permanent magnets were compared, one using only internal models and the other using a proprietary external function. The study is simulation based and the two models were compared to a previously experimentally verified stationary model. Results showed that the power output decreased by more than 30% after five successive faults. In addition, the no-load voltage had become unsymmetrical, which was explained by the uneven demagnetization of the permanent magnets. The permanent magnet with the lowest reduction in average remanence was decreased by 0.8%, while the highest average reduction was 23.8% in another permanent magnet. The internal simulation model was about four times faster than the external model, but slightly overestimated the demagnetization.

Suggested Citation

  • Stefan Sjökvist & Sandra Eriksson, 2017. "Investigation of Permanent Magnet Demagnetization in Synchronous Machines during Multiple Short-Circuit Fault Conditions," Energies, MDPI, vol. 10(10), pages 1-12, October.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:10:p:1638-:d:115399
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    References listed on IDEAS

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    1. Eriksson, Sandra & Solum, Andreas & Leijon, Mats & Bernhoff, Hans, 2008. "Simulations and experiments on a 12kW direct driven PM synchronous generator for wind power," Renewable Energy, Elsevier, vol. 33(4), pages 674-681.
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    Cited by:

    1. Mariusz Baranski & Wojciech Szelag & Wieslaw Lyskawinski, 2020. "Analysis of the Partial Demagnetization Process of Magnets in a Line Start Permanent Magnet Synchronous Motor," Energies, MDPI, vol. 13(21), pages 1-20, October.
    2. Yiguang Chen & Xuemin Chen & Yonghuan Shen, 2018. "On-Line Detection of Coil Inter-Turn Short Circuit Faults in Dual-Redundancy Permanent Magnet Synchronous Motors," Energies, MDPI, vol. 11(3), pages 1-31, March.
    3. Lynn Verkroost & Joachim Druant & Hendrik Vansompel & Frederik De Belie & Peter Sergeant, 2019. "Performance Degradation of Surface PMSMs with Demagnetization Defect under Predictive Current Control," Energies, MDPI, vol. 12(5), pages 1-20, February.
    4. Jonathan Sjölund & Sandra Eriksson, 2021. "Effect of Pole Shoe Design on Inclination Angle of Different Magnetic Fields in Permanent Magnet Machines," Energies, MDPI, vol. 14(9), pages 1-15, April.
    5. Zia Ullah & Jin Hur, 2018. "A Comprehensive Review of Winding Short Circuit Fault and Irreversible Demagnetization Fault Detection in PM Type Machines," Energies, MDPI, vol. 11(12), pages 1-27, November.

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