成果報告書詳細
管理番号20110000001456
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 希土類磁石向けディスプロシウム使用量低減技術開発(5)
公開日2011/12/13
報告書年度2010 - 2010
委託先名トヨタ自動車株式会社
プロジェクト番号P08023
部署名電子・材料・ナノテクノロジー部
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
研究開発項目4「自動車用磁石への応用」
4~1 ハイブリッド自動車駆動モータにおける評価【トヨタ自動車】
【緒言】
本研究開発項目では、21年度に研究されたDy使用量削減がもたらすトルク向上代
(計算結果 図1)を基本とする。出力密度を向上させるためのモータ構造の工夫による背反事項である損失(発熱)に対して、冷却システムの導入と効果予測を行う。
英文要約Nd-Fe-B magnets are useful permanent magnets utilized in many applications such as motors, HDD and mobile phones. Recently, they are used in motors of hybrid electric vehicles (HEV) which is one of the most promising application of Nd-Fe-B magnets. As high heat resistance and high coercivity are strongly required in HEVs, some amounts of Dy are added to Nd-Fe-B magnets. However, the natural abundance of Dy is quite low and producing countries are limited. Therefore, the development of Dy-free or Dy-less Nd-Fe-B sintered magnets with high coercivity is strongly demanded. In order to enhance the coercivity, grain refinement of microstructure in sintered magnets and the microstructural control at the interface between Nd2Fe14B and Nd-rich phases are important. Therefore, the following researches were carried out in this research.  Toyota Analysis and development of the cooling system for motors with Automatic Transmission Fluid PWM carrier harmonics has be reported as a cause of motor loss. Additionally, magnet performance, such as residual magnetic induction, could increase motor torque.  On the other hand, down sizing for motor could produce 'heat ', even though, high coercivity magnets were used. In this study, cooling system with Automatic Transmission Fluid should be reported.  ATF spray over the motor core could be effective as cooling down the HV motor system. Especially, ATF between motor stator and motor case would have specific performance for heat transfer.
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