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In this paper, the authors performed a numerical analysis of AC loss when a rotating magnetic field was applied to the MgB2 wire. The H-φ formulation was used for the finite element analysis. AC losses include coupling losses, hysteresis losses, and eddy current losses. The AC losses were calculated when the contact resistivity and contact length were changed. The rotational frequencies were 25 Hz and 50 Hz, and the maximum magnetic flux density amplitude was 0.01 T. As a result, it was revealed that the coupling loss was inversely proportional to the contact resistance. It was also revealed that the coupling loss was proportional to the square of the contact length. These trends can be understood from the theoretical formula for coupling loss.

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Keyword: MgB2 wire, rotating magnetic field, three-dimensional FEM analysis, AC loss, coupling loss

Date published: 2025-01-10

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Journal:

• IEEE Transactions on Applied Superconductivity (ISSN: 10518223) vol. 35 issue. 5 p. 1-5

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5593

First published URL: https://doi.org/10.1109/tasc.2025.3527950

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Updated at: 2025-07-16 16:30:32 +0900

Published on MDR: 2025-07-16 16:18:21 +0900