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Measurement of AC loss down to 25 K in a REBCO racetrack coil for electrical aircraft motor

The development of full superconducting motors for electric distributed aircraft propulsion requires to test the stator coils at the operation temperature, usually between 20 and 40 K. Here, we study the AC loss of a test racetrack coil made of REBCO tape. We developed a measurement system within a...

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Autores principales: Kováč, J., Kopera, Ľ., Pardo, E., Melišek, T., Ries, R., Berberich, E., Wolfstädler, S., Reis, T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9525724/
https://www.ncbi.nlm.nih.gov/pubmed/36180502
http://dx.doi.org/10.1038/s41598-022-20625-6
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author Kováč, J.
Kopera, Ľ.
Pardo, E.
Melišek, T.
Ries, R.
Berberich, E.
Wolfstädler, S.
Reis, T.
author_facet Kováč, J.
Kopera, Ľ.
Pardo, E.
Melišek, T.
Ries, R.
Berberich, E.
Wolfstädler, S.
Reis, T.
author_sort Kováč, J.
collection PubMed
description The development of full superconducting motors for electric distributed aircraft propulsion requires to test the stator coils at the operation temperature, usually between 20 and 40 K. Here, we study the AC loss of a test racetrack coil made of REBCO tape. We developed a measurement system within a non-metallic cryostat where a cryocooler cools the test coil in combination with liquid or solid nitrogen. We present transport AC loss measurements by electrical means down to 25 K for current amplitudes up to 140 A and frequency 18–576 Hz. The AC loss increased with second power with current, and did not depend on frequency or temperature. Later, we measured the AC parallel magnetization loss in a stack of tapes made of the same material as the coil, and in a stack of tapes without superconducting layer. The results in both samples is almost identical and presents the same behavior as the coil. We conclude that the main contribution to the AC loss in the tape stack and in the coil was from the magnetism of the Hastelloy substrate or buffer layers. Therefore, researchers need to take this into account in tape production and in superconducting motor design.
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spelling pubmed-95257242022-10-02 Measurement of AC loss down to 25 K in a REBCO racetrack coil for electrical aircraft motor Kováč, J. Kopera, Ľ. Pardo, E. Melišek, T. Ries, R. Berberich, E. Wolfstädler, S. Reis, T. Sci Rep Article The development of full superconducting motors for electric distributed aircraft propulsion requires to test the stator coils at the operation temperature, usually between 20 and 40 K. Here, we study the AC loss of a test racetrack coil made of REBCO tape. We developed a measurement system within a non-metallic cryostat where a cryocooler cools the test coil in combination with liquid or solid nitrogen. We present transport AC loss measurements by electrical means down to 25 K for current amplitudes up to 140 A and frequency 18–576 Hz. The AC loss increased with second power with current, and did not depend on frequency or temperature. Later, we measured the AC parallel magnetization loss in a stack of tapes made of the same material as the coil, and in a stack of tapes without superconducting layer. The results in both samples is almost identical and presents the same behavior as the coil. We conclude that the main contribution to the AC loss in the tape stack and in the coil was from the magnetism of the Hastelloy substrate or buffer layers. Therefore, researchers need to take this into account in tape production and in superconducting motor design. Nature Publishing Group UK 2022-09-30 /pmc/articles/PMC9525724/ /pubmed/36180502 http://dx.doi.org/10.1038/s41598-022-20625-6 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Kováč, J.
Kopera, Ľ.
Pardo, E.
Melišek, T.
Ries, R.
Berberich, E.
Wolfstädler, S.
Reis, T.
Measurement of AC loss down to 25 K in a REBCO racetrack coil for electrical aircraft motor
title Measurement of AC loss down to 25 K in a REBCO racetrack coil for electrical aircraft motor
title_full Measurement of AC loss down to 25 K in a REBCO racetrack coil for electrical aircraft motor
title_fullStr Measurement of AC loss down to 25 K in a REBCO racetrack coil for electrical aircraft motor
title_full_unstemmed Measurement of AC loss down to 25 K in a REBCO racetrack coil for electrical aircraft motor
title_short Measurement of AC loss down to 25 K in a REBCO racetrack coil for electrical aircraft motor
title_sort measurement of ac loss down to 25 k in a rebco racetrack coil for electrical aircraft motor
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9525724/
https://www.ncbi.nlm.nih.gov/pubmed/36180502
http://dx.doi.org/10.1038/s41598-022-20625-6
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