Performance Improvement of YBCO Coil for High-Field HTS-SMES Based on Homogenized Distribution of Magnetically-Mechanically Influenced Critical Current
Performance Improvement of YBCO Coil for High-Field HTS-SMES Based on Homogenized Distribution of Magnetically-Mechanically Influenced Critical Current
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DOI：
10.1109/tasc.2008.921890
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发表时间：
2008-06
影响因子：
1.8
通讯作者：
K. Higashikawa;Taketsune Nakamura;Michinaka Sugano;K. Shikimachi;N. Hirano;S. Nagaya
中科院分区：
文献类型：
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作者：
K. Higashikawa;Taketsune Nakamura;Michinaka Sugano;K. Shikimachi;N. Hirano;S. Nagaya
一般来说，对于高温超导线圈，相对于磁各向异性，垂直于导体宽表面的磁场应该被抑制得尽可能小。这就是为什么HTS-SMES期望具有相对较多基本线圈的环形线圈的原因。另一方面，从线圈中临界电流分布的均匀化角度出发，垂直场和平行场应与磁各向异性之比相对应地平衡。这意味着一定水平的垂直场有效地减少了线圈中的局部热产生。此外，这一概念对于通常的绕组方式(平绕)的高场线圈尤其合理，因为垂直场不会产生环应力，从而降低临界电流。在本文中，我们通过对用于2GJ级SMES的MOCVD-YBCO环形线圈的优化设计来说明这些发现，该设计考虑了磁和机械影响的J-E特性。
Generally speaking for a HTS coil, perpendicular magnetic field to conductor's broad surface should be suppressed as small as possible in relation to the magnetic anisotropy. This is a reason why toroidal coil with relatively many elementary coils is expected for HTS-SMES. On the other hand, from the point of view of the homogenization of critical current distribution in the coil, perpendicular field and parallel field should be balanced corresponding to the ratio of the magnetic anisotropy. This means that a certain level of the perpendicular field is effective to reduce local heat generation in the coil. Furthermore, this concept is especially reasonable for a high-field coil with usual winding method (flat-wise winding) because the perpendicular field does not induce hoop stress which decreases the critical current. In this paper, we show these findings through an optimal design of a MOCVD-YBCO toroidal coil for 2 GJ class SMES taking account of magnetically and mechanically influenced J - E characteristics.