Hahn Seungyong, Park Dong Keun, Bascuñán Juan, Iwasa Yukikazu
Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.
IEEE Trans Appl Supercond. 2011 Jun;21(3). doi: 10.1109/tasc.2010.2093492. Epub 2010 Dec 23.
This paper reports a study of HTS pancake coils without turn-to-turn insulation. Three no-insulation (NI) pancake coils were wound: each single and double pancake coil of Bi2223 conductor and one single pancake of ReBCO conductor. An equivalent electrical circuit for modeling NI coils was verified by two sets of test: 1) charge-discharge; and 2) sudden discharge. Also, an overcurrent test in which a current exceeding a coil's critical current by 2.3 times was performed, and analysed, to demonstrate that in terms of stability NI HTS coils outperform their counterparts. The new NI winding offers HTS coils enhanced performance in three key parameters: overall current density; thermal stability; and mechanical integrity.
本文报道了一项关于无匝间绝缘的高温超导煎饼线圈的研究。制作了三个无绝缘（NI）煎饼线圈：由Bi2223导体绕制的单饼和双饼线圈各一个，以及一个由ReBCO导体绕制的单饼线圈。通过两组测试验证了用于模拟NI线圈的等效电路：1）充放电测试；2）突然放电测试。此外，还进行并分析了过电流测试，即施加超过线圈临界电流2.3倍的电流，以证明在稳定性方面，高温超导NI线圈优于同类产品。这种新的NI绕组在三个关键参数方面提升了高温超导线圈的性能：整体电流密度、热稳定性和机械完整性。
