Yamamoto Ken-ichi

写真a

Title

Associate Professor

Researcher Number(JSPS Kakenhi)

60284957
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Current Affiliation Organization 【 display / non-display 】

  • Duty   University of the Ryukyus   Faculty of Engineering   School of Engineering_Electrical and Systems Engineering Program   Associate Professor  

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Electrical Energy and Systems Control Engineering   Associate Professor  

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Material,Structural and Energy Engineering   Associate Professor  

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Academic degree 【 display / non-display 】

  • Gifu University -  Doctor of Engineering

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External Career 【 display / non-display 】

  • 2003.08
    　
    　

    University of the Ryukyus, Faculty of Engineering, Department of Electrical and Electronics Engineering, Electromagnetic Energy Engineering, Associate Professor  

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Research Interests 【 display / non-display 】

  • Magnetics

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Research Areas 【 display / non-display 】

  • Nanotechnology/Materials / Structural materials and functional materials

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Measurement engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electric and electronic materials

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Research Theme 【 display / non-display 】

  • Magnetic domain observation

  • Magnetizing Process of Soft Magnetic Materials under Stress

  • Anomalous Permiability Increase Due to Stress Changes on Magnetic Materials

  • High accuracy magnetic measurement in high-frequency region

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Thesis 【 display / non-display 】

  • 弾性領域の応力下における軟質磁性材料の磁化特性に関する研究

    1996.03

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Published Papers 【 display / non-display 】

  • Effects of Coils on Precision of Magnetic Measurements for Low Permeability Toroidal Cores in High Frequency Region

    Yamamoto Ken-ichi, Narita Yoshimasa, Ishiyama Kazushi

    IEEJ Transactions on Fundamentals and Materials ( The Institute of Electrical Engineers of Japan )  143 ( 6 ) 216 - 221   2023.06 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    <p>High frequency magnetic measurements for low permeability toroidal cores are demonstrated using various primary and secondary coils on low permeability magnetic toroidal cores, and effects of coils on their precision is discussed. As the number of turns in primary and secondary coils are reduced, measured permeability shows higher dispersion. This fact relates to the deviation of the strength of magnetizing field due to the small number of primary windings. It is also demonstrated several winding methods of primary coil to reduce the dispersion.</p>

  • A study on magnetic measurement on low permeability toroidal cores in high frequency region

    K.Yamamoto, Y.Narita, K.Ishiyama

    The papers of Technical Meeting on Magnetics, IEE Japan ( IEE Japan )    2022.08

    Type of publication: Research paper (research society, symposium materials, etc.)

  • A study on magnetic measurement on low permeability troidal cores in high frequency region

    K.Yamamoto, Y.Narita, K.Ishiyama

    The papers of technical meetin on "Magnetics", IEE Japan ( The Institute of Electrical Engineers of Japan )  MAG-22 ( 022 )   2022.01

    Type of publication: Research paper (research society, symposium materials, etc.)

    　View Summary

    High frequency magnetic measurements for low permeability troidal cores are demonstrated using various primary and secondary windings. As the number of turns in primary and secondary coils is reduced, measured permeability has higher dispersion. This relates to the inhomogeneous in magnetizing field in the specimen. Measured permeability can also be affected by the condion of secondary winding.

  • An analyzing method for gradiometeres

    K.Yamamoto

    The Papers of Technical Meeting on Magnetics, IEE Japnan ( The Institute of Electrical Engineerings of Japan )  MAG18   2018.07

    Type of publication: Research paper (research society, symposium materials, etc.)

  • Fablication of a fluxmeter using a v/f converter and a PIC microcontroller

    K.Yamamoto, T.Ito

    The papers of Technical Meeting on Magnetics, IEE Japnan ( The Institute of Electrical Engineerings of Japan )    2017.11

    Type of publication: Research paper (research society, symposium materials, etc.)

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Presentations 【 display / non-display 】

  • Effects of coils on accuracy of magnetic losses on low-loss toroidal cores in high-frequency region

    Ken-ichi Yamamoto, Yoshio Narita, K.Ishiyama

    26th Soft Magnetic Materials Conference (SMM26)  2023.09  -  2023.09 

  • Effects of compressive stress normal to the surface of grain-oriented electruical steel sheets

    K.Yamamoto, T.Hamada, S.Yanase

    13th Int. Workshop on 1&2-Dim. Magnetic measurement and testing  2014.09  -  2014.09 

  • 電磁鋼板の面圧方向圧縮力下での二次元磁気特性測定装置の検討

    藪下, 柳瀬,岡崎, Yun, 山本健一

    マグネティックス研究会  2013.12  -  2013.12 

  • 面圧縮力下における方向性電磁鋼板の磁気測定法

    山本健一, 浜田稔之, 柳瀬俊次

    沖縄支所大会  2013.12  -  2013.12 

  • Effects of compressive stress normal to the surfeace of non-oriented electrical steel sheets

    Ken-ichi Yamamoto, Shunji Yanase

    12th Int. Workshop on 1&2-Dim. Magnetic measurement and testing  2012.09  -  2012.09 

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