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Magnetization loss of no-insulation coil for an electrodynamic suspension system
Superconductor Science and Technology ( IF 3.6 ) Pub Date : 2021-05-10 , DOI: 10.1088/1361-6668/abe18c
Xueliang Wang , Jie Sheng , Zhuoyan Zhong , Wei Wu , Xiao-Fen Li , Zhijian Jin , Zhiyong Hong

A high-temperature superconducting no-insulation (NI) coil, with its self-protection property, high engineering current density and unique demagnetization property, becomes a potential candidate for an electrodynamic suspension (EDS) system. Compared with the applications in high field magnets, the NI coil used in the EDS system is considered as working in a dynamic state, the magnetization loss generated in the NI coil is essential for the design of a cryogenic system. This paper presents the study on AC magnetization loss of NI coils by both numerical and experimental methods. Firstly, a 3D finite element numerical model representing the full geometry of the NI coil is built to analyse the effect of field frequency, field magnitude, as well as the radial characteristic resistance. Then, systematic discussions are conducted to figure out the working mechanism of NI coils. Finally, a calibration-free method testing platform is installed to validate the numerical model, and a modified model is proposed to represent the non-uniform radial characteristic resistance caused by stress distribution. The conclusions of this paper will be used in the future optimization of NI coils and the cryogenic design of the EDS system.



中文翻译:

电动悬挂系统无绝缘线圈的磁化损耗

高温超导无绝缘(NI)线圈以其自我保护特性、高工程电流密度和独特的退磁特性,成为电动悬架(EDS)系统的潜在候选者。与在高场磁体中的应用相比,EDS系统中使用的NI线圈被认为是在动态状态下工作的,NI线圈中产生的磁化损耗对于低温系统的设计至关重要。本文通过数值和实验方法对 NI 线圈的交流磁化损耗进行了研究。首先,构建了代表 NI 线圈完整几何形状的 3D 有限元数值模型,以分析场频率、场幅度以及径向特征电阻的影响。然后,对NI线圈的工作机理进行了系统的讨论。最后,安装免标定法测试平台对数值模型进行验证,并提出了一种修正模型来表示应力分布引起的非均匀径向特性阻力。本文的结论将用于未来NI线圈的优化和EDS系统的低温设计。

更新日期:2021-05-10
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