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成果報告書詳細
管理番号20170000000244
タイトル*平成28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2017/7/25
報告書年度2016 - 2016
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) FY2016 Annual Report

[1] Development of new high-performance magnets: (1) R&D on nano crystal grain sintered Neodymium magnets: Sintered Dy-free NdFeB magnets with (BH)max of 28 MGOe at 180 degree C were successfully obtained by optimizing the composition and the crystal grain refining conditions. (2) R&D on anisotropic NdFeB d-HDDR magnets with high Br and coercivity: Improvement of the squareness ratio of anisotropic bonded magnets was studied. In particular, the demagnetization curve of one particle was measured. By improving the magnetic powders coating, compound and molding method, the squareness ration of bonded magnet was improved by 12%. (3) R&D on fabrication of bulk magnets using nano particle FeN: Orientation Mr/Ms = 0.93, magnetization σs = 197 emu/g (@180 degree C) and residual magnetization Br = 17 kG were achieved by process optimization. (4) R&D on nano-structured multi-phase magnets: Intrinsic magnetic property of RE-TM12(-Nx) phases were researched and clarified to be capable of reaching to the target value of 50MGOe @ 180 degree C. (5) R&D on FeNi superstructure magnets: Order parameter and anisotropy magnetic field of FeNi superstructure were improved with refining nitriding and denitriding process. (Order parameter: 0.5 -> 0.7, anisotropy magnetic field: tripled compared to the previous method). [2] Development of high-performance soft magnetic materials - Development of high-Bs nano-crystalline soft magnetic materials: A laminated core (Bs greater than 1.6 T, core loss = 3.8 W/kg) was fabricated, and the target properties were accomplished. Both laminated core and dust core were fabricated into model motors to evaluate motor performance in practical use in collaboration with the Motor R&D Center. [3] Development of high-efficiency motors: Problems in evaluating demagnetizations and energy losses of magnets were solved. Performances of motors using new materials were evaluated. Evaluation methods of local iron losses of a motor driven by a PWM inverter were developed. Motors using new soft magnetic materials were prototyped, and the influence of compressive stress was evaluated. Magnetic properties of sintered Nd-Fe-B magnet under compressive stress and high temperature were evaluated. [4] Patent/technical trend survey and development of common fundamental technologies: Foreign patents surveys and domestic patents surveys on hard magnets, soft magnets and high-efficiency motors were completed. The result information of technical trends analysis was distributed and shared by MagHEM members. Through the DEM(Discrete Element Method) simulation and the experimental system, it was confirmed that to synchronize applying pulsed-magnetic field to magnetic particles with applying pressure to those was important for the high-aligned compact.
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