研究者業績

早乙女 英夫

サオトメ ヒデオ  (Hideo Saotome)

基本情報

所属
千葉大学 ⼤学院⼯学研究院 千葉大学
学位
博士(工学)(法政大学)
Ph.D.(法政大学)

J-GLOBAL ID
200901086516615001
researchmap会員ID
1000191932

外部リンク

論文

 54
  • Hideo Saotome, Tatsuki Washizu
    J. Magn. Soc. Jpn. 44(4) 102-107 2020年4月  査読有り
  • 早乙女英夫, 川越博幸, 栗田直幸
    電気学会論文誌A 138(12) 592-598 2018年12月  査読有り
  • Hideo Saotome, Keisuke Azuma, Hiroki Kizuka, Takuma Tanaka
    AIP ADVANCES 8, http://aip.scitation.org/doi/pdf/10.1063/1.5003858 056103 2018年  査読有り
  • Saotome H., Azuma K., Hamamoto Y.
    Journal of the Magnetics Society of Japan 41(3) 63-65 2017年3月  査読有り
    <p>  The dynamic magnetic loss in ferrites is obtained by subtracting the hysteresis loss, which is independent of the excitation frequency, from the iron loss. In the high frequency excitation region, the dynamic magnetic loss is the dominant component of the iron loss in ferrites. The iron loss in ferrite is temperature-dependent and this dependence has been described in product catalogs, where the hysteresis and dynamic losses are not separated. The catalog data are measured using sinusoidal wave voltage excitation, whereas ferrite cores are commonly used under rectangular wave voltage excitation in DC-DC converters. In this paper, the experimentally obtained temperature characteristics of the hysteresis and dynamic magnetic losses for rectangular wave voltage excitation are shown separately, and it is found that the two are different. This suggests that the physical mechanisms involved are different as well. Thus, it is important to consider the temperature characteristics of the dynamic magnetic loss to produce low-loss ferrites.</p>
  • Saotome H.
    Journal of the Magnetics Society of Japan 40(2) 19-21 2016年2月  査読有り
    The B-H loop of ferrites consists of two areas: one is the DC hysteresis loop and the other corresponds to the dynamic magnetic loss. The former is temperature dependent whereas the latter is temperature independent. The difference in the temperature dependence of these two areas suggests that the physical mechanism for the dynamic magnetic loss is different than that of the DC hysteresis loss. The eddy current loss in ferrite grains is a candidate for the dynamic magnetic loss. The conductivity of the ferrite grain was estimated from the experimental results of the dynamic magnetic loss. Based on the results, it was found that the conductivity is too large for iron oxide. This fact leads to some important suggestions.

MISC

 47

書籍等出版物

 2
  • 日本磁気学会, 早乙女, 英夫, 細谷, 達也, 矢野, 康司, 海野, 洋, 松木, 英敏, 田倉, 哲也, 佐藤, 文博, 一ノ倉, 理, 中村, 健二, 上野, 敏幸, 田島, 克文, 福岡, 克弘, 橋本, 光男, 小坂, 大吾
    共立出版 2015年11月 (ISBN: 9784320085916)
  • 斉藤, 制海, 天沼, 克之, 早乙女, 英夫
    朝倉書店 2000年3月 (ISBN: 4254228120)

所属学協会

 2

共同研究・競争的資金等の研究課題

 8