Systemization of elementary technology for high temperature superconductor AC applications based on electro-magnetics of fine structures of conductors

基于导体精细结构电磁学的高温超导交流应用基础技术系统化

• 批准号: 14102019
• 负责人: TSUKAMOTO Osami
• 金额: $ 69.64万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (S)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14102019/
• 关键词: AC Losses; High Temperature Superconductor; YBCO Wire; Bi; Ag Sheathed Wire; Assembled Conductor; Electro magnetic; AC Loss Measurement; Reduction of AC Losses; ビスマス線材; イットリウム線材; 磁気ナイフ法; カロリメトリック; ビスマス系線材; イットリウム系線材

If technologies are developed to reduce AC losses in high temperature superconductor (HTS) to less than one tenth of those of the conventional HTS technology, more various applications of HTS become feasible than just DC applications. Our research object is to systematically develop elementary technologies to reduce the AC losses in HTS applications by deep understanding of electromagnetic phenomena of HTS. To pursue the research object we set the following research targets;a)To developed measurement methods of AC losses in HTS wires, assembled conductors and windings;b)To research and develop methods to greatly reduce the AC losses in HTS wires in electromagnetic and mechanical environment of HTS apparatuses;c)To research and develop design methods of structures of robust and low AC loss windings;We obtained the following important achievements in the term of this project.1)We develop a method to electrically measure the total AC losses. The validity of this electric method was proven by the simultaneous measurements with a calorimetric method.2)We developed a quasi-twisting method to reduce magnetization losses in coated conductors due to external AC magnetic fields by more than one order of magnitude.3)We showed that the losses were greatly reduced by the magnetic field produced by the neighboring conductors in the assembled conductors.4)Analytic method to calculate the AC losses in the coil using the loss data of wires was developed. Based on this analytic method, optimal configuration of a coil was shown to minimize the AC losses.5)We calculated necessary amount of copper to protect a coil wound of coated conductors from damages caused by a quench and showed a configuration of robust coils.With those achievements, we almost fulfill the R＆D objects to develop elementary technologies to realize low AC loss HTS apparatuses.

如果开发出能够将高温超导体（HTS）中的交流损耗降低到传统 HTS 技术十分之一以下的技术，那么 HTS 的更多应用将变得比直流应用更可行。通过深入了解高温超导电磁现象来降低高温超导应用中的交流损耗为了实现这一研究目标，我们设定了以下研究目标；a）开发高温超导导线、组装导体和绕组中交流损耗的测量方法；b）研究。并开发了在高温超导装置的电磁和机械环境下大幅降低高温超导导线交流损耗的方法；c)研究开发了坚固、低交流损耗绕组的结构设计方法；在此期间我们取得了以下重要成果项目。1）我们开发了一种电学测量总交流损耗的方法，通过与量热法的同步测量证明了该电学方法的有效性。2）我们开发了一种准扭转方法来减少涂层导体中由于磁化损耗。外部交流磁场的影响超过一个数量级。3）我们表明，组装导体中相邻导体产生的磁场大大降低了损耗。4）使用解析方法计算线圈中的交流损耗基于这种分析方法，得出了线圈的最佳配置，以最大限度地减少交流损耗。5)我们计算了保护涂层导体线圈免受淬火和损坏所需的铜量。显示出稳健的配置凭借这些成果，我们几乎实现了开发实现低交流损耗高温超导设备的基础技术的研发目标。

项目成果

FEM analysis of AC loss in twisted Bi-2223 multifilamentary tapes carrying AC transport current in AC transverse magnetic field with arbitrary orientation

• DOI: 10.1109/tasc.2004.830269
• 发表时间: 2004-08
• 期刊: IEEE Transactions on Applied Superconductivity
• 影响因子: 1.8
• 作者: N. Amemiya;N. Enomoto;S. Shirai

An experimental method for total AC loss measurement of high Tc superconductors

• DOI: 10.1088/0953-2048/17/3/014
• 发表时间: 2004-03
• 期刊: Superconductor Science and Technology
• 影响因子: 3.6
• 作者: Zhenan Jiang;N. Amemiya

Electromagnetic field analysis of rectangular high Tc superconductor with large aspect ratio

• DOI: 10.1016/j.physc.2003.12.079
• 发表时间: 2004-10
• 期刊: Physica C-superconductivity and Its Applications
• 影响因子: 1.7
• 作者: N. Enomoto;N. Amemiya

Numerical evaluation of AC loss in high temperature superconducting coil

• DOI: 10.1109/tasc.2004.830027
• 发表时间: 2004-08
• 期刊: IEEE Transactions on Applied Superconductivity
• 影响因子: 1.8
• 作者: H. Tonsho;M. Toyoda;S. Fukui;M. Yamaguchi;T. Sato;M. Furuse;H. Tanaka;K. Arai;M. Umeda

AC loss reduction of YBCO coated conductors by multifilamentary structure

• DOI: 10.1088/0953-2048/17/12/018
• 发表时间: 2004-12
• 期刊: Superconductor Science and Technology
• 影响因子: 3.6
• 作者: N. Amemiya;Satoshi Kasai;K. Yoda;Zhenan Jiang;G. Levin;P. Barnes;C. Oberly