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Study of a Combined Demagnetization and Eccentricity Fault in an AFPM Synchronous Generator

Author

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  • Alexandra C. Barmpatza

    (Department of Electrical and Computer Engineering, University of Patras, 26504 Patras, Greece)

  • Joya C. Kappatou

    (Department of Electrical and Computer Engineering, University of Patras, 26504 Patras, Greece)

Abstract

This article investigates the combined partial demagnetization and static eccentricity fault in an Axial Flux Permanent Magnet (AFPM) Synchronous Generator. The machine is simulated using 3D FEM, while the EMF spectrum is analyzed in order to export the fault related harmonics using the FFT analysis. Firstly, the partial demagnetization fault, without the coexistence of eccentricity, and both the static angular and axis eccentricity faults, without the coexistence of partial demagnetization, are studied. In the case of eccentricity fault, the phase EMF sum spectrum has also been used as a diagnostic mean, because, when only eccentricity fault exists in the generator (either angular or axis) new harmonics do not appear in the EMF spectrum. Secondly the combination of partial demagnetization fault with static axis and static angular eccentricity is investigated and different comparisons are made when the demagnetization and the eccentricity level changes. The investigation revealed that the combination of eccentricity and demagnetization creates new harmonics in the EMF spectrum. The novelty of the article is that these combined faults are studied for the first time in the international literature, and the phase EMF sum spectrum has not been previously used for eccentricity diagnosis in this machine type.

Suggested Citation

  • Alexandra C. Barmpatza & Joya C. Kappatou, 2020. "Study of a Combined Demagnetization and Eccentricity Fault in an AFPM Synchronous Generator," Energies, MDPI, vol. 13(21), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:21:p:5609-:d:435314
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    References listed on IDEAS

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    1. Joya C. Kappatou & Georgios D. Zalokostas & Dimitrios A. Spyratos, 2017. "3-D FEM Analysis, Prototyping and Tests of an Axial Flux Permanent-Magnet Wind Generator," Energies, MDPI, vol. 10(9), pages 1-14, August.
    2. Yunkai Huang & Baocheng Guo & Ahmed Hemeida & Peter Sergeant, 2016. "Analytical Modeling of Static Eccentricities in Axial Flux Permanent-Magnet Machines with Concentrated Windings," Energies, MDPI, vol. 9(11), pages 1-19, October.
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    Cited by:

    1. Jin-Cheol Park & Soo-Hwan Park & Jae-Hyun Kim & Soo-Gyung Lee & Geun-Ho Lee & Myung-Seop Lim, 2021. "Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity," Energies, MDPI, vol. 14(10), pages 1-19, May.
    2. Apostolos Lamprokostopoulos & Epameinondas Mitronikas & Alexandra Barmpatza, 2022. "Detection of Demagnetization Faults in Axial Flux Permanent-Magnet Synchronous Wind Generators," Energies, MDPI, vol. 15(9), pages 1-15, April.

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