Two-dimensional measurement technique for dynamic magnetic flux density distribution on the surface of HTS bulk
Two-dimensional measurement technique for dynamic magnetic flux density distribution on the surface of HTS bulk
复制标题
高温超导块体表面动态磁通密度分布二维测量技术
DOI：
10.1109/tasc.2016.2525983
复制
发表时间：
2016
影响因子：
1.8
通讯作者：
Takumi Nakagawa and Mitsuru Izumi
中科院分区：
文献类型：
--
作者：
Tetsuya Ida;Takumi Nakagawa and Mitsuru Izumi
准确测量磁保持力是电磁机械发展的必然要求。一般来说，霍尔探头在HTS体上的扫描用于测量磁保持。由于霍尔探头是机械工作的，我们需要很长时间才能完成测量。然而，没有获得关于动态磁通密度分布的信息。另一方面，有一种方法，其中放置在HTS体表面上的几个霍尔元件测量保持的磁性。通过使用具有延迟的霍尔元件来测量动态磁保持的变化是困难的，但是霍尔元件在1 ms的量级上完成测量。相反，没有获得关于在整个HTS体表面上的磁通密度分布的信息。在这项研究中，我们已经开发的测量系统，其中动态磁通密度分布连续测量使用霍尔元件被放置在高温超导体表面在很短的时间。一种新的磁保持传感器，它由5 × 5 = 25个霍尔元件组成，每隔一定的间隔排列成一条线，每隔1ms就能测量一次高温超导体表面的磁保持量，225个霍尔元件需要900根电线。另一方面，我们的磁传感器只需要76根导线。我们将脉冲磁保持应用于具有5 × 5 = 25个霍尔元件的二维磁保持传感器中进行操作验证。该传感器测量的磁通密度分布的动态变化，每0.5毫秒。在未来，我们将澄清的磁通特性的细节被困到HTS大块磁铁通过使用二维磁保持传感器。
It is indispensable to the development of the superconductive electromagnetic machinery to measure the magnetic held precisely. In general, the scanning of a Hall probe over the HTS bulk is used for the measurement of the magnetic held. Because the Hall probe works mechanically, we need a long time before the measurement is completed. However, information about dynamic magnetic flux density distribution is not obtained. On the other hand, there is a method where several Hall elements placed on the HTS bulk surface measure the magnetic held. It is difficult to measure variation in the dynamic magnetic held by using a Hall element reacting with a delay, but a Hall element completes the measurement on the order of 1 ms. Instead, information about magnetic flux density distribution on the whole of the HTS bulk surface is not obtained. In this study, we have developed the measurement system of which dynamic magnetic flux density distribution is continuously measured using a Hall element to be placed on an HTS bulk surface in a short time. A new magnetic held sensor with 5 × 5 = 25 Hall elements forming a line at regular intervals can measure a magnetic held on the HTS bulk surface every about 1 ms. The 225 Hall elements require 900 electric wirings. On the other hand, our magnetic sensor needs only 76 wirings. We applied pulsed magnetic held to a two-dimensional magnetic held sensor with 5 × 5 = 25 Hall elements for operation verification. The sensor measured a dynamic variation of the magnetic flux density distribution every 0.5 ms. In future, we will clarify the details of the magnetic flux characteristic trapped to HTS bulk magnet by using the two-dimensional magnetic held sensor.