Comparison of pulsed magnetization processes for HTS bulk parts
Comparison of pulsed magnetization processes for HTS bulk parts
复制标题
高温超导散装零件的脉冲磁化工艺比较
DOI：
10.1088/0953-2048/15/5/321
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发表时间：
2002
影响因子：
3.6
通讯作者：
M. Kläser
中科院分区：
文献类型：
--
作者：
M. Sander;U. Sutter;M. Adam;M. Kläser
对于低温永磁体的潜在应用，熔融织构的YBaCuO块体零件被用来研究各种脉冲磁化过程中采用脉冲铜线圈。不同的多脉冲过程，包括不同的峰值场，脉冲持续时间，温度和几何形状的结果进行了比较。HTS材料的强载流能力，即使对于高于临界电流Jc的电流，也导致强屏蔽效应，特别是对于短脉冲持续时间。结果表明，存在于所有真实的材料中的不均匀性对初始磁通穿透起重要作用。为了完全磁化大块样品，非稳态条件和几何效应需要峰值场，其基本上超过在样品表面处测量的饱和磁化强度的两倍。瞬态磁化以及形状和绝对值的捕获磁通分布的报告。
With respect to the potential application as cryo-permanent magnets, melt-textured YBaCuO bulk parts were used to investigate various pulsed magnetization processes employing pulsed copper coils. Results for different multi-pulse processes including different peak fields, pulse durations, temperatures and geometries are compared. The strong current-carrying capabilities of HTS material, even for currents above the critical current Jc, result in strong shielding effects, in particular for short pulse durations. It turns out that the inhomogeneities present in all real materials play an important role for the initial magnetic flux penetration. To fully magnetize the bulk samples, the non-stationary conditions and geometrical effects require peak fields, which substantially exceed twice the saturation magnetization measured at the sample surface. Transient magnetizations as well as shapes and absolute values of trapped flux profiles are reported.