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Angle-dependence of the levitation force from a frustum-shaped magnet and recessed superconducting bulk

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posted on 17.12.2020, 07:45 by James Storey, Rodney Badcock
The widespread application of superconducting magnetic levitation bearings is limited by their relatively low stiffness. Recently we investigated a novel thrust bearing geometry comprised of a conical frustum (or truncated cone) shaped permanent magnet levitating inside a matching tapered hole machined into a high-temperature superconductor bulk. This configuration was found to produce superior restoring forces and stiffness compared to the conventional cylindrical magnet and superconductor arrangement. Here, using H-formulation finite-element simulations, we evaluate the angle-dependence of the frustum on the levitation force. We find that the optimal angle is not universal, but depends on the mode of displacement as well as the frustum dimensions. Correlations with the incident magnetic flux are identified for estimating the angle best suited to the operating regime of the bearing.

Funding

Ultra-high speed superconducting machines for hybrid-electric aircraft (RTVU1707) Ministry of Business, Innovation and Employment

History

Email Address of Submitting Author

james.storey@vuw.ac.nz

ORCID of Submitting Author

0000-0001-9995-7109

Submitting Author's Institution

Robinson Research Institute, Victoria University of Wellington

Submitting Author's Country

New Zealand

Licence

Exports