| Project/Area Number |
06555088
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Tohoku University |
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Principal Investigator |
ARAI Kenichi Tohoku University, Research Institute of Electrical Communication, Professor, 電気通信研究所, 教授 (40006268)
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| Co-Investigator(Kenkyū-buntansha) |
KATOU Yoshinori Alps, 第一研究室長(研究職
OHTSUKI Etsuo Tokin, 部長(研究職)
BI Xisao-fang Tohoku University, Research Institute of Electrical Communication, Research Asso, 電気通信研究所, 助手 (10261570)
ISHIYAMA Kazushi Tohoku University, Research Institute of Electrical Communication, Research Asso, 電気通信研究所, 助手 (20203036)
YAMAGUCHI Masahiro Tohoku University, Research Institute of Electrical Communication, Associate Pro, 電気通信研究所, 助教授 (10174632)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥14,400,000 (Direct Cost: ¥14,400,000)
Fiscal Year 1995: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1994: ¥12,700,000 (Direct Cost: ¥12,700,000)
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| Keywords | 3% SILICON-IRON / GROOVING / DOMAIN REFINEMENT / EDDY CURRENT LOSS / IRON LOSS / ETCHING / SCANNING ELECTRON MICROSCOPE / DOMAIN WALL NUMBER |
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| Research Abstract |
Electric energy loss at power transformers is 1.5*10^<10>kWh/year in Japan. To reduce the power loss, it is necessary to obtain a new material for the power transformer core. The purpose of this research work is to develop new grain oriented silicon steel sheets with very low loss.
We did examination of effects for domain refining by grooving on the surface of the thin grain oriented silicon steel sheets, dynamic domain observation, clarifying relation between domain movement and eddy current losses, estimation of the loss of domain refined samples. We found the magneto-static energy make the domain width narrow by grooving the surface. The mechanism of generating the eddy current loss by domain wall movement were clarified. The loss value of a 32mu m thickness sample obtained by this work is extremely low as 0.21W/kg at 50Hz, 1.7T.This value is 1/5 compare with the loss of the conventional grain oriented silicon steel sheets.
In conclusion, this work succeed to obtain the new material for reducing the electric power loss at the transformers. In addition, new mechanism for domain refinement are developed and the relation of domain movement and the eddy current loss were clarified.
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