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Design, Build, and Evaluation of an AC Loss Measurement Rig for High-Speed Superconducting Bearings

Author

Listed:
  • Mohammad Siamaki

    (Robinson Research Institute, Victoria University of Wellington, Lower Hutt 5012, New Zealand)

  • James G. Storey

    (Robinson Research Institute, Victoria University of Wellington, Lower Hutt 5012, New Zealand)

  • Lars Wiesehoefer

    (Fachhochschule Südwestfalen, Lindenstraße 53, 59872 Meschede, Germany)

  • Rodney A. Badcock

    (Robinson Research Institute, Victoria University of Wellington, Lower Hutt 5012, New Zealand)

Abstract

Friction and heat generated in conventional bearings impose a limit on maximum design speed in electrical machines. Superconducting bearings offer the potential for low loss, simplified, and passively stable bearings that can overcome the speed limit and operate at high loads. Although such bearings are contactless and seem to be loss free, AC loss mainly caused by magnetic field inhomogeneity gradually slows down the rotating body. This loss, whose mechanism has not been fully explored, is measured through spin-down tests where the rotational speed of the spinning rotor is measured as a function of time. However, there are some challenges in performing a reliable spin-down test. In this paper, we discuss these challenges as well as the engineering of an experimental test rig that enables us to spin-up, release, and recapture the levitated permanent magnet. We also discuss the specifications of the driving mechanism including the self-aligning coupling, which accommodates permanent magnets of different sizes. Initial test results at 6600 rpm are discussed and further technical improvements to the test rig suggested. This rig will be used as a key tool to explore the AC loss mechanism and inform the design of bearings for high-speed superconducting machines.

Suggested Citation

  • Mohammad Siamaki & James G. Storey & Lars Wiesehoefer & Rodney A. Badcock, 2022. "Design, Build, and Evaluation of an AC Loss Measurement Rig for High-Speed Superconducting Bearings," Energies, MDPI, vol. 15(4), pages 1-8, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:4:p:1427-:d:750307
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    References listed on IDEAS

    as
    1. Swarn Kalsi & Kent Hamilton & Robert George Buckley & Rodney Alan Badcock, 2018. "Superconducting AC Homopolar Machines for High-Speed Applications," Energies, MDPI, vol. 12(1), pages 1-14, December.
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    Cited by:

    1. Si-Woo Song & Won-Ho Kim & Ju Lee & Dong-Hoon Jung, 2023. "A Study on Weight Reduction and High Performance in Separated Magnetic Bearings," Energies, MDPI, vol. 16(7), pages 1-13, March.

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