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Stiffness Enhancement of a Superconducting Magnetic Bearing Using Shaped YBCO Bulks

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journal contribution
posted on 28.03.2021, 20:39 by James Storey, M Szmigiel, F Robinson, Stuart Wimbush, Rodney Badcock
© 2002-2011 IEEE. High-speed superconducting motors and generators stand to benefit from superconductor magnetic levitation bearings if their stiffness characteristics can be improved. Here we investigate a novel thrust bearing geometry, comprising a conical frustum shaped permanent magnet and matching superconducting toroid and puck assembly, aimed at producing high stiffness coupled with high levitation force. To this end, we have constructed a bearing test rig enabling measurements of the levitation force and stiffness of the assembly of YBa_2Cu_3O_{7-\delta } melt-textured bulks and Nd_2Fe_{14}B permanent magnet at temperatures down to 47 K. The experimental results are supported by finite element modeling that is validated against the experiment, and used to quantify the advantages of this configuration over a conventional cylindrical magnet and HTS puck arrangement. For axial displacements, the assembly produces higher and more consistent stiffness together with stronger restoring forces. For lateral displacements, the assembly produces up to double the lateral force and up to four times the stiffness. Our study also shows that the force contribution to the assembly from the small inner puck is negligible and it can therefore be eliminated from the bearing design.

History

Preferred citation

Storey, J. G., Szmigiel, M., Robinson, F., Wimbush, S. C. & Badcock, R. A. (2020). Stiffness Enhancement of a Superconducting Magnetic Bearing Using Shaped YBCO Bulks. IEEE Transactions on Applied Superconductivity, 30(4), 1-6. https://doi.org/10.1109/TASC.2020.2982884

Journal title

IEEE Transactions on Applied Superconductivity

Volume

30

Issue

4

Publication date

01/06/2020

Pagination

1-6

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Publication status

Published

ISSN

1051-8223

eISSN

1558-2515

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