An improved FEM model for computing transport AC loss in coils made of RABiTS YBCO coated conductors for electric machines
An improved FEM model for computing transport AC loss in coils made of RABiTS YBCO coated conductors for electric machines
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DOI：
10.1088/0953-2048/24/4/045005
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发表时间：
2011-04-01
影响因子：
3.6
通讯作者：
Coombs, Timothy A.
中科院分区：
文献类型：
--
作者：
Ainslie, Mark D.;Rodriguez-Zermeno, Victor M.;Coombs, Timothy A.
AC损耗对于利用或产生AC电流或磁场的任何应用（诸如电机）而言可能是显著的问题。研究了高温超导体的电磁特性，重点研究了用于全超导电机的YBCO涂层超导线圈的交流损耗。本文提出了一种改进的二维有限元模型，这种线圈的横截面的基础上，H制定。该模型是用来计算运输交流损耗的跑道形线圈使用恒定的和磁场依赖的临界电流密度，并列入和排除的磁性基板，发现在RABiTS（滚动辅助双轴织构基板）YBCO涂层导体。该线圈模型是基于剑桥大学EPEC超导小组的全超导永磁同步电动机设计中使用的超导定子线圈。为了验证模型的结果，传输交流损耗的定子线圈使用的电气方法的基础上电感补偿通过可变互感测量。最后，对电机性能的研究结果的影响进行了讨论。
AC loss can be a significant problem for any applications that utilize or produce an AC current or magnetic field, such as an electric machine. The authors investigate the electromagnetic properties of high temperature superconductors with a particular focus on the AC loss in superconducting coils made from YBCO coated conductors for use in an all-superconducting electric machine. This paper presents an improved 2D finite element model for the cross-section of such coils, based on the H formulation. The model is used to calculate the transport AC loss of a racetrack-shaped coil using constant and magnetic field-dependent critical current densities, and the inclusion and exclusion of a magnetic substrate, as found in RABiTS (rolling-assisted biaxially textured substrate) YBCO coated conductors. The coil model is based on the superconducting stator coils used in the University of Cambridge EPEC Superconductivity Group's all-superconducting permanent magnet synchronous motor design. To validate the modeling results, the transport AC loss of a stator coil is measured using an electrical method based on inductive compensation by means of a variable mutual inductance. Finally, the implications of the findings on the performance of the motor are discussed.