权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

基本信息

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

项目摘要

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.

为了阐明高温超导线圈的交流损耗特性，我们开发了一种新的测量系统，使我们能够定量评估暴露于外部交流磁场的高温超导带材中的电流分布。在我们的测量中，电流分布是从位于磁带周围的拾取线圈阵列测量的自场分布结果中间接得出的。为了提高外磁场下的测量精度，利用补偿线圈消除了拾波线圈信号中的外磁场分量，并通过测试导线验证了该测量系统的准确性和灵敏度，发现我们的系统足够精确，可以测量高温超导带材的电流分布。利用该系统，我们详细地测量了多芯Ag合金护套Bi-2223带材在外磁场中的电流分布特性，测量结果表明了我们的测量系统的实用性。此外，我们还发展了一种测量螺线管线圈形状的电流分布的方法。在这种方法中，我们通过使用位于线圈表面周围的拾取线圈来测量场分布。我们通过测试线圈验证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，可以测量高温超导线圈的电流分布。利用该方法对Bi-2223螺线管线圈的电流分布进行了初步测量。测量结果表明，I-ITS线圈中的电流分布并不均匀，电流分布的幅度和频率依赖性较小。