成果報告書詳細
管理番号20100000002432
タイトル*平成21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2011/4/20
報告書年度2009 - 2009
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
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
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20kW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。
・軽量コンパクトな高出力ランデル型基本構造の研究開発
・3次元鉄損現象の解明と対策および磁気/電気装荷配分の研究開発
・ブラシレス・スリップリングレス給電構造の研究開発
・車載用瞬発キャパシタの研究開発
・回転子コイルから瞬発キャパシタを用いて回生し界磁電流として用いるシステムの研究開発
・モータの性能(総合効率、出力密度)の確認
英文要約Development of high-performance battery systems for next-generation vehicles.
Elemental technology development.
Development of a high-performance motor system for next-generation vehicles equipped with a power-electronic interface for an energy storage.
(FY2009-20010) FY2009 Annual Report.
(1) Development of a synchronous motor with field coil excitation.
(1-1) Basic structures of a high-power light-weight Lundell type motor.
Specifications of 260mm outer diameter, 24-pole and brushless field excitation were selected for a second proto motor after design parameter study. The proto motor has ferrite magnets in the rotor in order to reduce magnetic saturation of the rotor core. Averaged air gap flux density of the proto motor was 0.56T which was same level as that of IPM (Interior Permanent Magnet) motors. Loss of the motor in a low-speed region was 1400 W and loss in a high-speed region was 1000 W equal with IPM. The maximum measured torque was 105 Nm and the maximum measured output power was 14.6 kW. The total weight of a magnetic parts, frames, bearings, and terminals is about 25kg. Therefore measured maximum torque density of 4.2 has achieved the intermediate target of 3 Nm/kg. And measured power density of 0.58 kW/kg is almost same level as intermediate target of 0.6 kW/kg.
(1-2) Clarification and countermeasures of three-dimension iron loss phenomenon, and design of magnetic and electric loadings
A coupled analysis technique was developed to presume the influence of the manufacturing process of the motor magnetic core. The technique consists of the structure analysis and the magnetic field analysis coupled by the core magnetic property database under the elasto-plastic deformation. This analysis method was applied to estimate the stator iron losses of the prototype motor which is caused by the press stamping process. It was confirmed that the iron loss of the motor core after stamping process increases about 30% compared with the iron loss of the motor core made by non-distorted process.
(2) Elemental technology development of power electronics for energy storage systems.
(2-1) Development of electric double layer capacitor cells for next-generation vehicles.
Developed cells (9cm2 class) were operated at 105C and at constant voltage, and the life of 1000 hours and more was verified. A cycle life test using an ultra-low resistance type cell was continued and renewed its world record (30 millions cycles). A parallel use of lithium ion battery and EDLC was studied and confirmed that parallel use of EDLC improved cycle life of the LIB near three times. Experimental manufacturing of an elliptical spiral-type capacitor (ca. 100 cm2 class) was carried out.
(2-2) Power electronics for energy storage devices.
It is necessary to launch the digital control power supply system to do the energy management of the total system. The digitalization of the converter that supplied the electric power from the capacitor to the field coil was completed. The DC/DC converter efficiency achieved 94% on the input voltage 12V, the output voltage 10V, and the output current 5A.
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