https://doi.org/10.1140/epjs/s11734-025-01716-7
Regular Article
AC loss of high-temperature superconducting motor considering critical current decay and DC ripple
1
School of Electrical Engineering and Automation, Wuhan University, 430072, Wuhan, China
2
National Key Laboratory of Electromagnetic Energy, Naval University of Engineering, 430033, Wuhan, China
3
East Lake Laboratory, 430073, Wuhan, China
4
School of Electrical Engineering, Southeast University, 210096, Nanjing, China
a
bbokai@qq.com
b
303973172@qq.com
Received:
27
December
2024
Accepted:
25
April
2025
Published online:
16
June
2025
Accurate calculation of AC losses in superconducting magnets is crucial for the selection of low-temperature cooling systems and is also a prerequisite for ensuring the safe and stable operation of superconducting motors. The comprehensive decay factor of critical current is introduced to improve the characterization of critical current in superconducting tapes. The characteristics of DC ripple were analyzed to take into account the impact of special operating conditions of the motor on the AC losses of superconducting magnets. It has been found that the optimized trapezoidal magnet structure has significantly lower AC loss than before optimization, and can also reduce the impact of the comprehensive decay factor of critical current, making the operation of the magnet safer. When the outer decay factor is 18% and the inner attenuation factor is 15%, the effect is most significant, and the maximum reduction can be about 200W. The AC loss of superconducting magnets is positively correlated with the ripple amplitude ratio and excitation current, and the relationship with ripple frequency depends on the magnitude of the ripple amplitude ratio. When the ripple amplitude ratio is less than or equal to 2%, the ripple frequency has almost no effect on the magnet loss. When the ripple amplitude ratio is greater than 2%, the magnet loss increases rapidly with increasing frequency.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
