Nanostructured metallic cores with extremely low loss and controlled permeability
Nanostructured metallic cores with extremely low loss and controlled permeability
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DOI：
10.1109/tmag.2002.802421
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发表时间：
2002-09-01
影响因子：
2.1
通讯作者：
Arai, KI
中科院分区：
文献类型：
--
作者：
Fukunaga, H;Yanai, T;Arai, KI
垂直于带轴的磁各向异性诱导在纳米晶FeCuNbSiB带在拉伸应力下的结晶，和带的相对磁导率约为250。用于扼流线圈的环形芯由所述带制备。磁损耗随着芯直径的增加而降低，并且发现通过使芯直径大于由磁致伸缩和感生各向异性的值确定的临界直径，抑制了由于形成环形芯而导致的磁性能的劣化。结果，实现了具有极低损耗的环形磁芯。开发的磁芯的磁导率保持恒定，最高可达1 MHz，其磁损耗远小于先前报道的具有低磁导率的纳米结构和无定形磁芯的损耗值。测量的磁损耗与计算的经典涡流损耗一致。此外，磁导率和磁损耗保持恒定的直流偏置场，是三倍以上，适用于铁氧体切割芯具有相同的磁导率值。
Magnetic anisotropy perpendicular to the ribbon axis was induced in nanocrystalline FeCuNbSiB ribbons by crystallization under tensile stress, and the relative permeability of the ribbon was approximately 250. Toroidal cores for a choke coil were prepared from the ribbons. The magnetic loss decreased with increasing the core diameter and it was found that deterioration of magnetic properties due to formation of a toroidal core was suppressed by making the core diameter larger than the critical diameter determined from the values of magnetostriction and induced anisotropy. As a result, toroidal cores with extremely low loss were achieved. The permeability of the cores developed was kept constant up to 1 MHz and their magnetic loss was much smaller than the loss values reported previously for nanostructured and amorphous cores with low permeability. The measured magnetic loss agreed with the calculated classical eddy current loss. In addition, the permeability and magnetic loss were kept constant up to the dc bias field, being three times higher than that applicable to a ferrite cut core with the same permeability value.