2000 Fiscal Year Final Research Report Summary
Application of Magnetic Alloy Ribbons to Extremely Compact EMI Noise Filters
| Project/Area Number |
10837002
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電磁場環境
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| Research Institution | Yamagata University |
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Principal Investigator |
ISHII Osamu Yamagata University, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (80282234)
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| Co-Investigator(Kenkyū-buntansha) |
SHINOHARA Shin-ichi Electromagnetic Compatibility Research Laboratories Co., Ltd., Deveice Countermeasure Technology Research Department, General Manager, 機器対策技術部, 部長
MORITA Hiroaki Yamagata University, Faculty of Engineering, Professor, 工学部, 教授 (50005914)
SATO Takashi Tokyo Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (50260534)
KAMBE Shiro Yamagata University, Greduate School of Science and Engineering, Assistant Professor, 大学院・理工学研究科, 助教授 (20211188)
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| Project Period (FY) |
1999 – 2000
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| Keywords | Filter / Amorphous / Magnetic / Noise / Manocrystalline / EMI / Cable |
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| Research Abstract |
Magnetic properties and impedance characteristics of thin films and ribbons were investigated to achieve very compact EMI noise filters. Heat treatments enhanced the soft magnetic properties and the impedance of Co-based amorphous and Fe-based nanocrystalline ribbons. It was demonstrated that the ribbons annealed under optimized conditions provided the same noise attenuation value as a conventional noise filter(a ferrite core)but with 1/24th the volume.
Next, the Co-based amorphous ribbon was applied as a shielding material of a signal cable. It was clarified that a cable wrapped with the Co-based amorphous ribbon radiated very small EMI noise and had very high immunity to external noise. It was also proved that signal loss, as well as the EMI noise attenuation and immunity to external noise, was greatly improved by using Al foil shielding between cores and the Co-based amorphous ribbon shielding. Moreover, the signal loss, EMI noise radiation and immunity were improved by grounding the Co-based amorphous ribbons.
Moreover, the superior EMI noise attenuation characteristic was not influenced by rupture or crack of the Co-based amorphous ribbons. Consequently, it was confirmed that cables shielded with both Al and magnetic ribbons had great potential for long time service.
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