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Electromagnetic Modeling of the Copper Layers Influence for AC Losses in ReBCO Coated Conductors Based on T-A Formulation

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Bibliographic Details
Title: Electromagnetic Modeling of the Copper Layers Influence for AC Losses in ReBCO Coated Conductors Based on T-A Formulation
Authors: Inês S. P. Peixoto, Sofia Viarengo, João F. P. Fernandes, Fabio Freschi, Laura Savoldi, Silvio Vaschetto
Source: IEEE Transactions on Applied Superconductivity. 35:1-5
Publisher Information: Institute of Electrical and Electronics Engineers (IEEE), 2025.
Publication Year: 2025
Subject Terms: Loss measurement, Copper, Superconducting films, Voltage measurement, Conductors, Numerical models, Current measurement, Superconductivity, Finite element analysis, Superconducting epitaxial layers, AC loss, finite element method, Coated superconductors, ReBCO, T-A formulation
Description: ReBCO coated conductors are a promising solution to be integrated in superconducting electrical machines due to their high transport current under high magnetic fields. However superconducting armature windings will be subjected to AC fields and AC currents, resulting in non-negligible loss. These losses need to be estimated to achieve feasible designs since they strongly decrease the performance of the superconductors, affecting machine operation. In numerical models, ReBCO tapes are often represented by a superconducting thin sheet due to their high aspect ratio. Nonetheless, research shows that at high currents and/or frequencies, the influence of the stabilizing copper layers in the coated conductor's losses can become significant. In this paper, we propose a 2D electromagnetic model based on the T-A formulation to include the effect of copper layers on current distribution and on the evaluation of losses through Finite Elements Method models. A ReBCO tape is investigated when different currents and magnetic fields (perpendicular to the tape surface) are imposed, and the magnetization and transport losses of the superconductors show good agreement with homogenized T - A formulation, experimental and analytical results.
Document Type: Article
File Description: application/pdf
ISSN: 2378-7074
1051-8223
DOI: 10.1109/tasc.2024.3522906
Rights: IEEE Copyright
Accession Number: edsair.doi.dedup.....8ebc093725d320c4e9a2bc6bc9d87be5
Database: OpenAIRE
Description
Abstract:ReBCO coated conductors are a promising solution to be integrated in superconducting electrical machines due to their high transport current under high magnetic fields. However superconducting armature windings will be subjected to AC fields and AC currents, resulting in non-negligible loss. These losses need to be estimated to achieve feasible designs since they strongly decrease the performance of the superconductors, affecting machine operation. In numerical models, ReBCO tapes are often represented by a superconducting thin sheet due to their high aspect ratio. Nonetheless, research shows that at high currents and/or frequencies, the influence of the stabilizing copper layers in the coated conductor's losses can become significant. In this paper, we propose a 2D electromagnetic model based on the T-A formulation to include the effect of copper layers on current distribution and on the evaluation of losses through Finite Elements Method models. A ReBCO tape is investigated when different currents and magnetic fields (perpendicular to the tape surface) are imposed, and the magnetization and transport losses of the superconductors show good agreement with homogenized T - A formulation, experimental and analytical results.
ISSN:23787074
10518223
DOI:10.1109/tasc.2024.3522906