Study on Electrical Measurement Method of AC Loss in Oxide High Tc Superconducting Magnet

氧化物高温超导磁体交流损耗电学测量方法研究

• 批准号: 15560261
• 负责人: MUKAI E.
• 金额: $ 1.54万
• 依托单位: Sojo University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560261/
• 关键词: Superconducting Magnet; AC Loss; Electrical Measurement; Oxide High Tc Superconductivity; Phase Difference; 酸化物超電導コイル; 交流損失の電気的計測; 酸化物超伝導コイル

Superconducting magnets have been studied to extend the new technology region. At present, low T_c superconductive wire (LTSW) has almost reached the level of practical use. In contrast, high T_c superconductive wire (HTSW) is more advantageous than LTSW, because it is possible to use liquid nitrogen in the cooling. The HTSW of long-length multi filaments has recently been manufactured, and a shift from LTSW to HTSW is expected in the future. A grasp of AC loss for the superconducting magnet is very important, since the AC loss is essentially generated in the superconducting wire.In this research, the phase difference measurement, which is related to the evaluation of the AC loss of the superconducting magnet, was carried out. The methods of three types were proposed to measure the phase difference of the superconducting magnet and the measurement of the phase difference was performed.First, the superconducting magnet of a double pancake coil was constructed using HTSW with Bi-2223 multi filaments. Next, an exciting test of the magnet using the AC power supply was performed. As a result, it was confirmed that the phase difference between the voltage and the current of the magnet almost approximated 90°. Finally, the phase difference of the superconducting magnet was measured using the electronic circuits of three types. Especially, the measuring result of the electronic circuit using op-amps agrees with the result by a lock-in amplifier comparatively well, and thus it is considered that the electronic circuit is practical.

超导磁体已被研究以扩展新技术领域，目前，低T_c超导线材（LTSW）已几乎达到实用水平，相比之下，高T_c超导线材（HTSW）比LTSW更具有优势。最近已经制造出了长多丝的 HTSW，并且预计将来会从 LTSW 转向 HTSW 掌握交流损耗。超导磁体非常重要，因为交流损耗本质上是在超导导线中产生的。在本研究中，进行了与超导磁体的交流损耗评估相关的相位差测量的三种方法。提出了测量超导磁体相位差的类型，并进行了相位差的测量。首先，使用带有 Bi-2223 多丝的 HTSW 构建双扁平线圈的超导磁体。使用交流电源对磁体进行励磁测试，结果证实磁体的电压和电流之间的相位差几乎接近90°。最后，测量了超导磁体的相位差。使用三种类型的电子电路，特别是使用运算放大器的电子电路的测量结果与锁定放大器的结果比较吻合，因此认为该电子电路是实用的。

项目成果

Measurement Test of Phase Difference in high Tc Superconducting Magnet

高温超导磁体相位差测量试验

• 发表时间: 2005
• 期刊: 19th International Conference on Magnet Technology(MT-19) Genoa, Italy (平成17年9月発表予定) THA03P003(発表予定)
• 作者: E.Mukai;S.Fukai;et al.
• 通讯作者: et al.

森山, 深井, 向井: "Verilog-HDLを用いた微小位相差計測における自動振幅調整回路の設計"電子情報通信学会 第11回九州支部学生会講演会論文集. C-18. 67 (2003)

Moriyama、Fukai、Mukai：“使用 Verilog-HDL 进行微小相位差测量的自动幅度调整电路的设计”第 11 届电子信息通信工程师学会九州分会学生会议论文集 C-18。

位相差計測回路の設計

相位差测量电路设计

• 发表时间: 2005
• 期刊: 電子情報通信学会総合大会 A-1-23(CD-ROM)
• 作者: 森山;深井;向井
• 通讯作者: 向井

Design of the automatic adjustment circuit using Verilog-HDL for measurement of phase difference

基于Verilog-HDL的相位差测量自动调整电路设计

• 发表时间: 2003
• 期刊: Proceedings of 2003 IEICE, 11th Conference for Students in Kyusyu C-18
• 作者: N.Moriyama;S.Fukai;E.Mukai
• 通讯作者: E.Mukai

Design of circuit for measurement of phase difference

相位差测量电路的设计

• 发表时间: 2005
• 期刊: Proceedings of the 2005 IEICE General Conference A-1-23 (CD-ROM)
• 作者: N.Moriyama;S.Fukai;E.Mukai
• 通讯作者: E.Mukai