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Description:

In order to develop submerged pumps to transfer liquid hydrogen, high temperature superconducting (HTS) motors to drive them as one of key components are a promising candidate with low electromagnetic loss and large specific power density per unit mass. However, since armature windings wound using HTS wires have a couple of problems such as three-phase unbalanced currents and frequency limitations, HTS wires are used only for rotor windings of the motors and metallic cables have to be applied to their armature windings. Therefore, numerical analyses to evaluate loss properties in multi-strand metal twisted cables for armature windings of HTS motors cooled at liquid hydrogen temperature are carried out by means of a two-dimensional finite element method. On the basis of a clarified physical mechanism of losses generated in the windings arranged within a slot of armature iron core, the obtained numerical results are also reproduced with theoretical expressions of the Joule loss for an alternating transport current and the eddy-current loss for an externally applied AC magnetic field. The influences of losses on the frequency and number of strands in metal twisted cables are investigated quantitatively.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Armature winding, Eddy current loss, Joule loss, Finite element method, Theory

Date published: 2025-10-30

Publisher: Springer Science and Business Media LLC

Journal:

• Journal of Superconductivity and Novel Magnetism (ISSN: 15571939) vol. 38 issue. 6 229

Funding:

• New Energy and Industrial Technology Development Organization JPNP23004

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1007/s10948-025-07069-5

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Updated at: 2026-01-06 11:18:28 +0900

Published on MDR: 2026-01-06 12:19:34 +0900