成果報告書詳細
管理番号20160000000846
タイトル*平成27年度中間年報 次世代自動車向け高効率モーター用磁性材料技術開発
公開日2016/9/28
報告書年度2015 - 2015
委託先名高効率モーター用磁性材料技術研究組合
プロジェクト番号P14015
部署名材料・ナノテクノロジー部
和文要約
英文要約Title: Development of magnetic material technology for high-efficiency motors (FY2014-FY2016) FY2015 Annual Report

[1] Development of new high-performance magnets: (1) R&D on nano crystal grain sintered Neodymium magnets: Sintered Neodymium magnets were fabricated using nano crystalline grains with the average size of 0.8 micron made by HDDR method and Helium jet-mill. The difference of the microstructure between the HDDR-sintered magnets and the conventional sintered magnets was clarified. (2) R&D on anisotropic NdFeB d-HDDR magnets with high Br and coercivity: Both high Br and high coercivity by d-HDDR treatment under a low temperature and low hydrogen pressure were examined. The optimizations of the microstructure of the starting materials for the d-HDDR process were made. (3) R&D on fabrication of bulk magnets using nano particle FeN: Relative density of bulked Fe16N2 has reached 72% by spark plasma sintering process. Both Fe16N2 structure retention rate and collection rate were confirmed to be more than 90%. (4) R&D on nano-structured multi-phase magnets: Nd lean magnets by means of Ce with nano-structured multi-phase based on (RE)2-TM14-B were synthesized using infiltration technique. RE-TM12(-Nx) phases with high intrinsic magnetic property were also developed and synthesized in powder form. (5) R&D on FeNi superstructure magnets: The apparatus for insertion/extraction of large amount of nitrogen atoms was built. Crystal structure changes were evaluated in nitriding and denitriding process. Synthesis of ordered FeNi alloy was confirmed. [2] Development of high-performance soft magnetic materials - Development of high-Bs nano-crystalline soft magnetic materials: A dust core (Bs greater than 1.6T, core loss = 5.4W/kg) was fabricated using Hot press technique. For a laminated core, the heat treatment process to stabilize nanocrystals precipitation was investigated, and thermal behavior of the precipitation was analyzed. [3] Development of high-efficiency motors: Problems in evaluating demagnetizations and energy losses of magnets were identified. Performances of motors using new materials were estimated. Evaluation methods of iron losses under the condition of dc-magnetic field superimposed were developed. An experimental setup to evaluate influences of compressive stress on motors with soft magnetic ribbon material was developed. Change of magnetic property of sintered Nd-Fe-B magnet under compressive stress was evaluated. [4] Patent/technical trend survey and development of common fundamental technologies: Foreign patents surveys on hard magnets, soft magnets and high-efficiency motors were started. Domestic patents surveys were continued. Technical trends analysis result information was distributed inside the MagHEM. A magnetic-aligned process of hard magnetic particles was simulated by DEM(Discrete Element Method), and the particle motion under magnetic field and high pressure was successfully visualized.
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