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Recent developments of measurement of permanent magnetic materials

机译：永磁材料测量的最新进展

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摘要

Recent advances of measurement of permanent magnetic materials in National Institute of Metrology (NIM) have been reviewed. A closed-magnetic-circuit hysteresisgraph has been built to investigate the sweep rate dependence of coercivity on permanent magnets. The linear relationship between coercivity and logarithmic sweep rate has been found, and the maximum difference of H-C in the sweep rate is 1.1%. The obtained thermal activation length is comparable with the characteristic length of the magnets and the underlying mechanisms are discussed. Then, the constant of Helmholtz coils has been calibrated by a new current method and the uncertainty of the value is,0.12%. Last, a Helmholtz coils-based system with high accuracy has been developed to measure the orientation angle of permanent magnets. The two-dimensional (2D) method has been presented to substitute for the three-dimensional (3D) method to improve the measurement efficiency.
机译：美国国家计量学院（NIM）的永磁材料测量的最新进展已得到综述。已经建立了闭合磁路磁滞曲线图，以研究矫顽力对永磁体的扫描速率依赖性。已经发现矫顽力与对数扫描速率之间存在线性关系，H-C扫描速率的最大差值为1.1％。所获得的热激活长度与磁体的特征长度相当，并讨论了潜在的机理。然后，用一种新的电流法对亥姆霍兹线圈的常数进行了校准，其不确定度为0.12％。最后，已经开发出一种基于Helmholtz线圈的高精度系统，用于测量永磁体的定向角。提出了二维（2D）方法来代替三维（3D）方法，以提高测量效率。

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  • 来源
    《Materials Research Innovations》 |2015年第3期|S3.41-S3.45|共5页
  • 作者

    Gong W. J.; Hou R. F.; Zhang Z. G.; He J.; Lin A. L.; Xu Z. Y.; Fan W.; Wang J. P.;

  • 作者单位

    Natl Inst Metrol, Magnet Mat Measurements Lab, Beijing 100029, Peoples R China;

    Natl Inst Metrol, Magnet Mat Measurements Lab, Beijing 100029, Peoples R China;

    Natl Inst Metrol, Magnet Mat Measurements Lab, Beijing 100029, Peoples R China;

    Natl Inst Metrol, Magnet Mat Measurements Lab, Beijing 100029, Peoples R China;

    Natl Inst Metrol, Magnet Mat Measurements Lab, Beijing 100029, Peoples R China;

    Natl Inst Metrol, Magnet Mat Measurements Lab, Beijing 100029, Peoples R China;

    Natl Inst Metrol, Magnet Mat Measurements Lab, Beijing 100029, Peoples R China;

    Natl Inst Metrol, Magnet Mat Measurements Lab, Beijing 100029, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sweep rate; Helmholtz coils; Orientation angle; Permanent magnets; Measurement; NdFeB;

    机译：扫描速率;亥姆霍兹线圈;取向角;永磁体;测量;NdFeB;

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