成果報告書詳細
管理番号20110000000822
タイトル*平成22年度中間年報 希少金属代替材料開発プロジェクト 超軽量高性能モータ等向けイットリウム系複合材料の開発(4)
公開日2011/8/5
報告書年度2010 - 2010
委託先名国立大学法人九州大学
プロジェクト番号P08023
部署名エネルギー対策推進部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等
研究開発項目【1】「超長尺イットリウム系複合材料における希少金属使用量低減技術開発」
(2)TFA-MOD 法による複合材料作製プロセス開発
超長尺複合材料プロセス開発に必要な、1)評価が律速とならないような評価速度と、2)特性劣化部をmm 以下のサイズを検出できる検出分解能とを両立させた上で、全長に亘って特性評価・欠陥検出を行うために、磁気顕微法を用いた特性及び局所欠陥の評価技術開発を行い、小型装置を用いた原理検証を行うとともに、長尺複合材料評価装置を開発した。
英文要約Title: The Rare Metal Substitute Materials Development Project. 9-(2) Development of New Permanent Magnets Substituting for Nd-Fe-B Magnets and Development of Yttrium-based Compound. Development of Yttrium-based Composite Material for Ultra-light and High-performance Motors (FY2009-FY2011) FY2010 Annual Report (Kyusyu University). [Theme 1 ”Development of long Y-based composite materials for reduction of RE metals consumption”, Sub-theme(2) Development of the production process of Y-based composites by TFA-MOD technique] With the aim of realizing the characterization all over the length of an Y-based composite with a sufficiently fast speed and also the detection of the defects with a resolution with mm order, we developed the evaluation and detection techniques with a magnetic microscopy and produced an evaluation apparatus. [Theme 3 “Preliminary R&D on rotating machines using Y-based composite materials”; Sub-theme (1) Conceptual design of the rotating machines with appropriate structure] We aimed at the conceptual design of a 500 kW-1000 rpm superconducting motor with an advantage in property in comparison to conventional ones. The principal objects in view were the optimization of the superconducting field windings and the reduction of the weight, i.e. the amount of rare earth. First we measured the dependences of the critical current on temperature, magnetic field and an applied magnetic field angle. On the basis of the observed results, we studied the interrelation between the configuration and arrangement of the field windings and the magnitude of magnetic field at the gap, output power, efficiency, torque property and so on. The optimum field winding is a lampshade-type racetrack one. Next we measured the ac losses of short straight Y-based composites using a saddle-shaped pickup coil and then evaluated the induced ac losses in the field windings due to the varying magnetic field of armature windings which were composed of copper windings and an iron yoke. The induced ac loss in the field windings was no more than several W even in case of no damper shied and it was negligible in comparison to the heat input to the cryogenic rotor by thermal conduction and radiation. The torque ripple was also no more than 0.1 %. Thus we concluded that a 500 kW-1000 rpm motor with a superconducting rotor has a merit of lightweight, compactness and high efficiency in comparison to conventional ones and we can also reduce the amount of rare earth down to several %. Further we studied full superconducting motors with REBCO superconducting tapes. Recently we found out the fact that REBCO superconducting tapes with highly oriented grains show extremely low ac loss properties. We think that it may be due to magnetic phase transition of REBCO superconducting films. As the result of study, we concluded that it is possible to realize advantageous full superconducting motors even for a 400 kW-3600rpm output power, which are applicable to automobile.
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