Studies on current distributions and AC losses of High Tc Superconducting conductors used for electrical power machines and devices

用于电力机械和设备的高温超导导体的电流分布和交流损耗研究

• 批准号: 14550270
• 负责人: KAWABATA Shuma
• 金额: $ 2.3万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550270/
• 关键词: current distribution; HTS conductor; HTS tape; pickup coil; self-field distribution; HTS coil; Bi-2223; 高温超伝導テープ線材

In order to elucidate the AC loss characteristics of HTS coils, we developed a new measurement system that enabled us to quantitatively evaluate the current distributions in HTS tapes exposed to an external AC magnetic field. In our measurement the current distributions are indirectly found from the results of the self-field distributions measured by an array of pickup coils located around the tape.For improved measurement accuracy under the external magnetic field, a compensation coil was used to cancel the coniponent of the external magnetic field from the signal of pickup coil.We confirmed the accuracy and the sensitivity of this measurement system by using a test conductor, and found that our system was accurate enough to measure the current distributions for the HTS tapes. Using this system, we minutely measured the characteristics of the current distributions in multifilamentary Ag alloy sheathed Bi-2223 tape exposed to an external magnetic field.Measured results showed the practicality of our measurement system.Further, we also developed a measurement method to evaluate the current distributions of a solenoidal coil shape.In this method, we measured the field distributions by using pickup coils located 'around the coil surface. We confirmed the accuracy and the sensitivity of this measurement system by using a test coil, and found that our method was accurate enough to measure the current distributions for the HTS coils. By using our method, the preliminary measurement of the current distributions of a Bi-2223 solenoidal coil was performed. Measured results showed that the current distributions in the I-ITS coil were not uniform.The amplitude and frequency dependencies of the current distributions were observed slightly.

为了阐明HTS线圈的交流损耗特性，我们开发了一个新的测量系统，使我们能够定量评估暴露于外部AC磁场的HTS磁带中的当前分布。在我们的测量中，当前的分布是从通过磁带周围的一系列拾取线圈测量的自我场分布的结果间接发现的。在外部磁场下提高了测量精度，用于取消补偿线圈，以取消通过拾取的信号来取消外部磁场的测试器系统的准确性和测量器的准确性，并使用该测量器的准确性和验证器的准确性和该测量器的准确性，并且使用该测量器的准确性和该测量器的敏感性和该测量器的准确性和验证器的准确性，并且使用该系统的敏感性和一定的敏感性。 HTS磁带的当前分布。使用该系统，我们仔细测量了暴露于外部磁场的多型AG合金护套BI-2223胶带中当前分布的特征。测量结果显示了我们的测量系统的实用性。我们还开发了一种测量方法，以评估螺旋盘形状的当前组合的电流分布，使用该线圈，我们选择了该磁盘的当前分布。我们通过使用测试线圈确认了该测量系统的准确性和灵敏度，并发现我们的方法足够准确，可以测量HTS线圈的当前分布。通过使用我们的方法，进行了BI-2223螺线管线圈的当前分布的初步测量。测得的结果表明，I-ITS线圈中的当前分布不是均匀的。略微观察到当前分布的振幅和频率依赖性。

项目成果

S.Kawabata: "Measurement of AC Current Distributions in HTS Tapes Exposed to an External AC Magnetic Field by a Compensated Pickup Coil Array"IEEE Trans.Appl.Supercond.. 13・2. 3655-3658 (2003)

S. Kawabata：“通过补偿拾取线圈阵列测量暴露于外部交流磁场的 HTS 磁带中的交流电流分布”IEEE Trans.Appl.Supercond.. 13・2（2003 年）。

松下 堅護: "外部交流横磁界中における高温超伝導テープ線材の電流分布測定"第67回2002年度秋季低温工学・超電導学会講演概要集. 245 (2002)

Takamoru Matsushita：“外部交流横向磁场中高温超导带线的电流分布测量”2002年第67届秋季低温工程与超导学会会议摘要245（2002）。

川畑 秋馬: "Bi-2223高温超電導コイルの電流分布測定"九州大学超伝導システム科学研究センター報告. 1(印刷中). (2004)

Akima Kawabata：“Bi-2223高温超导线圈中的电流分布测量”九州大学超导系统科学研究中心报告1（出版中）。

川畑 秋馬: "Bi-2223高温超電導コイルの電流分布測定"九州大学超伝導システム科学研究センター報告. 1. 105-110 (2004)

Akima Kawabata：“Bi-2223高温超导线圈中电流分布的测量”九州大学超导系统科学研究中心报告1. 105-110 (2004)。

川畑 秋馬: "Bi-2223高温超電導コイルの電流分布測定"第69回2003年度秋季低温工学・超電導学会講演概要集. 31 (2003)

Akima Kawabata：《Bi-2223高温超导线圈的电流分布测量》2003年第69届秋季低温工程与超导学会会议摘要31（2003）。