成果報告書詳細
管理番号20110000000437
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 脱レアアースを目指す自動車用モータの研究開発
公開日2012/6/27
報告書年度2009 - 2009
委託先名国立大学法人名古屋工業大学
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1. 研究開発の内容及び成果等
本年度は,実車駆動の性能数値目標に適合する平成20年度に設計した実スケールハイブリッド界磁モータに対し,その約1/3サイズの準相似形スケールダウン機の設計試作と試験性能評価を実施した。試作機による実性能評価試験の目的は,コンピュータ上でのモータ設計ならびに仮想性能評価に用いた3次元有限要素磁場解析(3D-FEM,現株式会社JSOL社製JMAG-Studio Ver.9.0)の精度検証であり,解析精度が十分に高いことの確認をもって,表1に示す実スケールハイブリッド界磁モータの性能実現可能性を明らかにすることを目標としている。
英文要約Title: Development of high-performance battery systems for next-generation vehicles/Elemental technology development/Research and development of electric motors employing non- or less-rare-earth magnet for vehicle propulsion/Research and development of hybrid excitation motor using SMC core (FY2008-FY2011) FY2009 Annual Report

At the second year in this project, we firstly designed the downsized motor, which was almost with similar form of the full-sized hybrid excitation motor designed at the first year. This purpose was essentially for the confirmation of computation accuracy of 3D-FEM (three-dimensional Finite Element Method) used through the design and the performance predictions of the full-sized motor. By comparing the measured and the 3D-FEM computed characteristics of the trial manufacturing of the downsized motor, the computation accuracy of 3D-FEM was possible to evaluate. If it has had enough accuracy, it was reasonable to suppose that the predicted results regarding to excellent drive performances of the full-sized motor was highly reliable. Considering the difficulties that arisen from real manufacturing, we carefully designed the downsized motor in terms of possible airgap length, shape of stator teeth shoe to safely accommodate the armature winding, the insulation distance between SMC field pole core and coil-end and so forth. We have been able to determine all of dimensions of the downsized motor without any failures for testing purpose and had its trial manufacturing as a test machine successfully. By using the test machine, the open-circuit line-to-line voltage waveform, which was generally called "induced voltage" by permanent magnet flux, was measured. In this measurement, the field toroidal coils were disconnected and hence, these were unexcited. The voltage waveform measured was in good agreement with the one computed by 3D-FEM. As the next test, the measurements of open-circuit line-to-line voltage waveforms under the different field excitations were done. It could be found that the approximately 100% field weakening was carried out by field weakening excitation control. This was the unique characteristic of the proposed machine and no one has achieved it at the present in the world. Although the error between the measured and the computed field adjustment capabilities was not small and 28% due to some misalignments or the difference between the designed and the manufactured field airgap dimensions, the measured field strengthening and weakening capability had same tendency of the computed one. The maximum torque under the maximum excitation condition was measured. The error between the measured and the computed maximum torque was 7% and therefore, it was concluded that the 3D-FEM based design and performance predictions were highly reliable. As a result, the predicted performance of the full-sized machine at the first year, which was very high maximum power density with 3.4kW/kg at the maximum power operation with 124.5kW at 6.5kr/min under utilization of 517g rare-earth magnet was highly expected. Therefore, we have had confidence that the proposed machine becomes enough feasible solution for less-rare-earth magnet and high power density motor as traction drives for next-generation vehicles.
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