成果報告書詳細
管理番号20090000000756
タイトル*平成20年度中間年報 次世代自動車用高性能蓄電システム技術開発/要素技術開発/次世代自動車用高性能モータ蓄電パワエレシステムの研究開発
公開日2010/3/24
報告書年度2008 - 2008
委託先名三菱電機株式会社
プロジェクト番号P07001
部署名燃料電池・水素技術開発部 蓄電技術開発室
和文要約以下本編抜粋:1. 研究開発の内容及び成果等 レアアースを用いずにPMモータ並みの性能が得られるハイブリッド自動車、プラグインハイブリッド自動車や電気自動車等に使用するコイル界磁式同期モータを実現することを目指した研究開発を実施する(図1参照)。このため、以下の6つの項目の要素技術の研究開発を進め、最終目標を平成23年度に設定して10kW級コイル界磁型同期モータ要素試験機の研究開発とモータトータルシステムの研究開発を行う。
英文要約Development of high-performance battery systems for next-generation vehicles.
Elemental technology development.
Development of a high-performance motor equipped with power electronics of energy storage systems for next-generation vehicles.
(FY2008-2009) FY2008 Annual Report.
1. Development of a synchronous motor with field coil excitation.
(1) Basic structure of high-power light-weight lundell motors.
Specifications of 260mm outer diameter, 32-pole and brushless field excitation were selected for a first proto motor after design parameter study for a lundell motor. The finite element simulation research for the proto motor showed magnetic saturation occurred over 3000AT (ampere turn) field excitation. Average air gap flux density of the proto motor became 0.53T which was almost same level with IPM (Interior Permanent Magnet) motors. The joule loss of the proto motor becomes minimum value of 1500W with 2500-3000AT field excitation. Further research to be more higher efficiency considering iron loss will be also done with bench test for the proto motor. Magnetic parts weight 22.6kg and the total weight of the proto motor, including other parts such as bearings, a frame and connectors can be expected as less than 33kg which will qualify our first target of over 3Nm/kg.
(2) Clarification and countermeasures of three-dimension iron loss phenomenon, and design of magnetic and electric loadings
Magnetic characteristics of steel sheets with elasto-plastic deformation were measured, which was assumed to be formed on the stator core in manufacturing process. And iron loss analysis technique using the measured data were researched and developed.
Both the compression and the tensile stress were considered at the elastic deformation, and changes of magnetic permeability and iron loss (hysteresis loss and eddy-current loss) were measured. Using this analysis technique, the stator core structure in which the iron loss is reduced is scheduled to be designed.
2. Elemental technology development of power electronics for energy storage systems.
(1) Development of electric double layer capacitor cells for next-generation vehicles.
Trial manufactured cells (9cm2 class) were operated near and above 100°C, and it was found that an operation at 105°C was possible if the rated voltage was low enough. Cycle life test of 25 millions times (a world record) at a quick charge and discharge mode (1s) was conducted using an ultra-low resistance type test cell, and it proved that it had enough cycle life for vehicle use. Experimental manufacturing of an elliptical spiral-type capacitor (ca. 100 cm2 class) was started. Order-made EDLC modules of low resistance type were tested at charge and discharge modes, and temperature distributions in the module were evaluated.
(2) Power electronics for energy storage devices
A high efficiency DC-DC converter which can operate at a large conversion ratio is demanded for vehicle use. It was developed a coupled-inductor DC-DC converter with an active-clamp technique for reducing voltage surge. As the result, high efficiency of 90.5-93.5% was obtained under conditions of an output current (18A) and its large conversion ratios (1/7-1/10).
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