成果報告書詳細
管理番号20110000000502
タイトル*平成22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 等価狭ギャップ構造による脱レアアース高性能リラクタンストルク応用モータの研究開発2
公開日2012/6/27
報告書年度2010 - 2010
委託先名ダイキン工業株式会社
プロジェクト番号P07001
部署名スマートコミュニティ部
和文要約1. 研究開発の内容及び成果等
1.1 研究開発の目的
本研究開発の目的は、レアアース永久磁石の使用量がゼロで従来技術と同等の総合効率および出力密度となる、脱レアアース高性能リラクタンストルク応用モータを開発することである。具体的には、フェライト磁石を補助的に用いる同期リラクタンスモータ(フェライト磁石補助型同期リラクタンスモータ)において、高トルク化、および、実ギャップ長を短縮することなく狭ギャップモータと同等の性能となる等価狭ギャップ構造を組み合わせる設計技術と生産技術を開発することを目的とする。
英文要約Title: Development of High-performance Battery System for Next-generation Vehicles / Elemental Technology Development / Research and Development of Rare-earth-less High-performance Reluctance Motor with Equivalent Narrow Gap Structure (FY2008-FY2011) FY2010 Annual Report

The objective of this project is the development of a rare-earth-less high-performance reluctance motor which has the same efficiency and power density as an IPMSM that uses rare-earth permanent magnets. A permanent magnet assisted synchronous reluctance motor (PMASynRM) that uses the ferrite magnet in the auxiliary was studied. The design method and production technology for a motor with an equivalent narrow air gap which enables to have the same performance as a motor with a narrow air gap was developed. For a motor having an air gap with step structure, it is necessary to divide the stator core because the rotor cannot be inserted into the stator core along the axis direction. It is demanded to assemble the divided stators accurately and reduce the losses in their joint parts. We designed the stator core with a step joint structure on the both circumferential ends. It enables to joint divided stator cores accurately, and to endure the magnetic forces in the axis direction. It was confirmed that the eddy current losses were reduced about 7% in the stator cores having step joint structure than the flat one. As for a SynRM, the width of bridges on the rotor surface influences on the torque characteristics, and the rotor mechanical strength against the centrifugal forces when the rotor rotates at a high speed. To design the rotor having high torque characteristics and high mechanical strength, the stress analysis using FEA and the measurement of the elastic deformation of the rotor diameter were carried out when the centrifugal force was applied. The rotor structure design was achieved to satisfy the torque characteristics and the mechanical strength at a speed of 10000min-1. On our studies, it was confirmed that the copper losses accounted for more than 80% of the total losses in a PMASynRM. Therefore, we designed and built a liquid cooling motor frame to transfer the heat generated in the windings through the stator core. It was built by casting aluminum and a copper pipe. It enables to drive and evaluate a 20kW-PMASynRM at the rated load. The deformations of a stator generated by the magnetic forces in a motor air gap significantly influence on the motor vibrations and noises. It is important to clarify the magnitude and the distribution of the flux density and the magnetic force in the air gap. The measurement of the flux density and the magnetic force in the air gap of 5kW-PMASynRM was carried, to clarify the flux distribution in the air gap of PMASynRM and design a low noise motor. The magnetic force was obtained from the flux density in the air gap, which was measured by search coils newly developed, at no-load and load conditions. The measurement of the magnetic force and the vibration characteristics of 20kW-PMASynRM will be done by using this method.
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