MEASUREMENT OF REPULSIVE FORCE OF HIGH-TC MATERIALS DUE TO MEISSNER EFFECT AND ITS 2-DIMENSIONAL DISTRIBUTION

被引：5

作者：

ISHIGAKI, H ^{[1
]}

ITOH, M ^{[1
]}

HIDA, A ^{[1
]}

ENDO, H ^{[1
]}

OYA, T ^{[1
]}

OHYAMA, T ^{[1
]}

MINEMOTO, T ^{[1
]}

机构：

[1] KOBE UNIV,DEPT INSTRUMENTAT ENGN,KOBE 677,JAPAN

来源：

IEEE TRANSACTIONS ON MAGNETICS | 1991年 / 27卷 / 02期

关键词：

D O I：

10.1109/20.133708

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

As a basic study for magnetic bearings using high Tc superconductors, evaluations of the materials were conducted. These evaluations included measurements of repulsive force and lateral restoring force of various kinds of YBCO pellets. Pure air which was supplied in the process of fabrication and presence of Ag in YBCO showed evident effects on increasing the repulsive force. Lateral restoring force which was observed in the lateral displacement of a levitated permanent magnet over YBCO pellets was also affected by pure air and presence of Ag. A new measuring instrument for magnetic fields was developed by using a highly sensitive force sensor. This instrument had the capability of measuring repulsive force due to Meissner effect, and therefore, it was used for evaluating the two dimensional distribution of superconducting properties. Results showed that the pellets had non-uniformity of superconducting properties. Two dimensional distribution of residual flux density on the pellets which had been cooled in a magnetic field (field cooling) was also observed by the instrument. The mechanism of generating lateral force was discussed in relation to the distribution.

引用

页码：2427 / 2430

页数：4

共 10 条

[1]

CHU PW, 1987, PHYS REV LETT, V58, P908

[2] LATERAL RESTORING FORCE ON A MAGNET LEVITATED ABOVE A SUPERCONDUCTOR [J].