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成果報告書詳細
管理番号20180000000225
タイトル*平成29年度中間年報 戦略的省エネルギー技術革新プログラム/省エネルギー技術開発事業の重要技術に係る周辺技術・関連課題の検討/究極の低鉄損モータの磁気特性の調査
公開日2018/6/28
報告書年度2017 - 2017
委託先名学校法人トヨタ学園豊田工業大学
プロジェクト番号P12004
部署名省エネルギー部
和文要約
英文要約Title: Strategic Energy-Saving Innovation Program. Examination on Neighboring Techniques and Allied Problem to Affect Critical Technology of Energy-Saving Technology Development Business. "Magnetic Characteristic Investigation on Ultimate Low Iron Loss Motor" FY2017 Annual Report

FY2017 Trial Manufacturing Ultimate Low Iron Loss Motor and its Magnetic Characteristic

It is an important issue to reduce the loss of electrical motor which accounts for half of the electric energy consumption. The iron loss that was not studied for difficulty in understanding so far is focused on here and an ultimate low iron loss motor is manufactured for trial. It is realized by applying amorphous and nano-crystal material to motor core and bonded NdFeB to permanent magnet. Nano-crystal material has about one-20th smaller iron loss than NO (Non-Oriented silicon steel). Though bonded NdFeB has about 40% smaller residual magnetization than sintered NdFeB widely used in IPMSM (Implemented Permanent Magnet - Synchronous Motor), bonded one has about 3×106 larger electrical resistance than sintered one.

The magnetic characteristics are introduced by the experimental motor core loss evaluation system which measures input electrical power and current from inverter, mechanical torque and rotational speed as well as the electromagnetic field numerical calculation of voltage source two-dimensional eddy current non-linear transitional analysis. Though the measured core loss, which consists of stator iron loss, rotor iron loss and permanent magnet eddy current loss, is impossible to separate them, the calculation one is possible. The electrical motor of IPMSM is 8-poles, 12-slots, centralized winding, and the rated power is 400 W.

Motor core loss of three motors (1: NO-stator, NO-rotor, Bond-PM (Permanent Magnet), 2: Nano-stator, NO-rotor, Bond-PM, 3: Nano-stator, Nano-rotor, Bond-PM, where, Bond is bonded NdFeB, Nano is nano-crystal soft magnetic material) is measured in inverter excitation and no-load condition. The experimental data show that the measured motor core loss decreases in order of 1: NO-stator, NO-rotor, Bond-PM, 2: Nano-stator, NO-rotor, Bond-PM, 3:
Nano-stator, Nano-rotor, Bond-PM. So the electrical motor of Nano-stator, Nano-rotor, Bond-PM is evaluated as the ultimate low iron loss motor.

The numerical calculation data also show that the motor core loss decreases in order of 1, 2, 3, which is the same order as the experimental core loss. Magnet eddy current loss is almost zero because of bonded NdFeB PM. When motor core changes from NO to nano-crystal, iron loss reduces. However, the differences between the measured core loss and the calculated one increase in NO to nano-crystal, though the deviation between them is almost constant.

In case of sintered PM and NO rotor, the measured core loss and the calculated one are almost same, where stator core material is NO or nano-crystal and the excitation method is inverter or sinusoidal. Therefore the experimental method, calculation method, input material data and manufacturing method are thought to be checked again especially in the case of nano-crystal rotor and bonded PM, where the core loss is extremely small.
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