Development of magnetic cores with extremely loss and controllable permeability using creep-induced ansisotropy

利用蠕变诱导各向异性开发具有极高损耗和可控磁导率的磁芯

基本信息

批准号：
12650319
负责人：
FUKUNAGA Hirotoshi
金额：
$ 1.86万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

Magnetic anisotropy was induced to Fe-Nb-Cu-Si-B nanocrystalline ribbons by ciystallizing amorphous ribbons from the amorphous state under tensile stress, and extremely low loss and controllable permeability were achieved in them. Investigations on the induction and relaxation processes of the anisotropy revealed that the anisotropy is induced during the crystallization. Thus, the anisotropy was improved in magnitude by controlling the annealing proces s during crystallization.Subsequently, the methods of preparing toroidal cores from developed ribbons was studied. Among several methods investigated, the formation of a toroidal core by winding the ribbons after crystallization achieved the most superior magnetic properties. Therefore, we investigated this method in detail. 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. Resultantly, toroidal cores with extremely low loss were achieved. The permeability of the developed cores 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.

磁各向异性被诱导到Fe-NB-CU-SI-B纳米晶体中，通过在拉伸应力下从无定形状态的无定形丝带中心构层，并在其中实现了极低的损失和可控的渗透性。对各向异性的诱导和松弛过程的研究表明，在结晶过程中诱导各向异性。因此，通过控制结晶过程中的退火过程来改善各向异性。随后，研究了从发达的丝带中制备环形核心的方法。在研究的几种方法中，结晶后通过缠绕丝带缠绕丝带的形成达到了最出色的磁性。因此，我们详细研究了这种方法。磁损耗随着核心直径的增加而减小，发现由于形成环形核的形成而导致的磁性变质通过使核直径大于从磁体突变值和诱导各向异性的值确定的临界直径的大于临界直径。结果，实现了极低损失的环形核心。发达的核心的渗透性保持恒定至1 MHz，其磁损耗远小于先前报道的纳米结构和无定形核心的损耗值。测得的磁损耗与计算出的经典涡流损失一致。此外，渗透率和磁损耗保持不变，直至DC偏置场比适用于具有相同渗透率值的铁氧体切割核高三倍。