Anisotropy control by inverse magnetostriction for electrical steel for motors with low loss

• Project/Area Number: 26289084
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Electronic materials/Electric materials
• Research Institution: Tohoku University
• Principal Investigator: ishiyama kazushi 東北大学, 電気通信研究所, 教授 (20203036)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000); Fiscal Year 2016: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2015: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2014: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
• Keywords: 磁気異方性 / 電磁鋼板 / 渦電流損失 / 逆磁歪効果 / 磁区 / 損失 / モータコア

Outline of Final Research Achievements

In order to reduce the iron loss of electrical steel for motors, we have to control the magnetic easy axes which orient to thick-direction of the electrical steels due to random orientation of crystal grains. An in-plane eddy current loss associated with thick-direction change of magnetic flux will be reduced when the thick-direction components of the magnetization can be turned toward in-plane of the electrical steels. Therefore, to obtain a basic relation, we investigated magnetic properties of electrical steels under uniform in-plane stress.As a result, it is clearly observed that the magnetization increases with tensile stress, and decreases with compressive stress. It is expected that the magnetizations of thick-direction were rotated to in-plane by applying tensile stress. These results shows the proposed method can reduce the iron loss of the electrical steels.

Research Products

• [Journal Article] Internal stress distribution for generating closure domains in laser-irradiated Fe-3%Si(110) steels (2015)
  • Author(s): K. Iwata, M. Imafuku, T. Suzuki, T. Shobu, H. Orihara, Y. Sakai, K. Akira, S. Ohya, and K. Ishiyama
  • Journal Title: Journal of Applied Physics Volume: 117 Issue: 17
  • DOI: 10.1063/1.4916183
  • Peer Reviewed / Open Access
• [Journal Article] Temperature Dependence of Lancet Domains in Grain-Oriented Fe-3%Si Steels (2015)
  • Author(s): K. Iwata, M. Suzuki, M. Hashimoto, M. Ueda, Y. Matuoka, T. Yasue, T. Koshikawa, M. Kotsugi, T. Ohkochi, T. Kinoshita, Y. Watanabe, K. Ishiyama
  • Journal Title: IEEE Transactions on Magnetics Volume: 51 Issue: 11 Pages: 2002504-2002504
  • DOI: 10.1109/tmag.2015.2431713
  • Peer Reviewed / Open Access
• [Journal Article] Calculation of Basic Domain Width Considering Lancet Domains in (110)[001]Fe3%Si (2014)
  • Author(s): Keiji Iwata, Satoshi Arai, Kazushi Ishiyama
  • Journal Title: IEEE TRANSACTIONS ON MAGNETICS Volume: 50 Issue: 2 Pages: 7008604-7008604
  • DOI: 10.1109/tmag.2013.2283299
  • Peer Reviewed
• [Journal Article] Quantitative Analysis of 90° Closure Domains Occurring by Compressive Stress in Fe3%Si(110) Steels (2014)
  • Author(s): Keiji Iwata, Kazushi Ishiyama, Masahiko Suzuki, Michihiko Hashimoto, Masato Ueda, Yoshiaki Matuoka, Tsuneo Yasue, Takanori Koshikawa, Masato Kotsugi, Takuo Ohkochi, Toyohiko Kinoshita, Yoshio Watanabe
  • Journal Title: IEEE TRANSACTIONS ON MAGNETICS Volume: 50 Issue: 11 Pages: 2007004-2007004
  • DOI: 10.1109/tmag.2014.2327645
  • Peer Reviewed
• [Journal Article] Prediction method of basic domain structure in Fe3%Si(110) single crystal (2014)
  • Author(s): K. Iwata, M. Fujikura, S. Arai, K. Ishiyama
  • Journal Title: JOURNAL OF APPLIED PHYSICS Volume: 115 Issue: 17
  • DOI: 10.1063/1.4868923
  • Peer Reviewed