Development of modeling method for anomalous eddy current loss in electrical steel sheets considering polycrystalline and magnetic domain structures

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K04419
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: Oita University
• Principal Investigator: Gao Yanhui 大分大学, 理工学部, 准教授 (40586286)
• Co-Investigator(Kenkyū-buntansha): 村松 和弘 佐賀大学, 理工学部, 教授 (30263627)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 電磁鋼板 / 異常渦電流損 / 磁区構造 / 結晶方位 / 磁界解析

Outline of Final Research Achievements

In this study, to clarify the loss generation mechanism and improve the accuracy of iron loss analysis of electrical steel sheets, we developed a numerical modeling method that takes into account the polycrystalline and magnetic domain structure of electrical steel sheets. During the research period, we developed a numerical modeling method that takes into account the anomalous eddy current loss caused by 180°domain wall movement, and anomalous eddy current loss caused by nonuniform magnetic flux due to different grain orientations. We applied the developed methods to the anomalous eddy current loss calculation and quantified the loss due to 180°domain wall movement and grain orientation.

Free Research Field

電気機器

Academic Significance and Societal Importance of the Research Achievements

電磁鋼板の異常渦電流損に関する研究は，1970年代から，電磁鋼板素材自身の鉄損を低減するため，実験と理論計算による研究が盛んになされて，異常渦電流損の発生原因を一部明らかにした．現在，数値解析技術は日々進化しており，数値解析技術を用いて低鉄損の電気機器を設計するため，数値的な手法で異常渦電流損の発生原因を再検討するようになった．数値的な手法その多くは，鉄損の測定値とフィッティングする方法で，各周波数と磁束密度での汎用が難しい．本研究で開発した手法は磁区構造と結晶方位を考慮した物理的な汎用性あるモデリング手法である．