著者

貝森 弘行 岡本 吉史 若尾 真治

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.139, no.4, pp.380-387, 2019-04-01 (Released:2019-04-01)

参考文献数

15

被引用文献数

1

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Recently, from the viewpoint of vibration and noise reductions, torque ripple reduction of motor-equipped electrical machines is the need of the hour. The authors have already proposed to improve torque characteristics of a synchronous reluctance motor using the topology optimization method. The evaluated rotor structure succeeded in substantial torque ripple reduction, but the cause for this reduction was unknown. In this paper, we investigate the reason for torque ripple reduction using the improved rotor structure of the motor by a topology optimization method known as R-SLP, by comparing it to the reference model using finite element analysis. A calculation method is proposed to analyze the circumferential magnetic force density of spatial and time harmonic orders using the magnetic density in the air gap. By focusing on the time order at which the torque waveform was evaluated, we estimate which circumferential magnetic force density orders affect torque ripple reduction. Then, we clarify the reason for torque ripple reduction to examine the influence of local shape of rotor structure using 12th time-harmonic magnetic fields. As a result, the modified flux barrier rotor structure is obtained, which further reduces the torque ripple in comparison to the previous structure.

著者

山下 祐輝 子田 陸 片山 一哉 岡本 吉史

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.9, pp.729-737, 2021-09-01 (Released:2021-09-01)

参考文献数

20

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Because the interior permanent magnet synchronous motor (IPMSM) is one of the most efficient motors, it is applied to many industrial machines. The electromagnetic characteristic of IPMSM is dependent on many design parameters such as the position and shape of flux barrier, the magnetization angle of permanent magnet, the current phase angle and so on. The topology optimization (TO), which is an attractive method due to the wide design range with high degree of freedom, has been applied to the rotor design of IPMSM. In this paper, two stage TO method is proposed. Firstly, to widely search the rotor structure, the density method (DM) which handling gray scale is carried out. Next, the obtained structure is set to the initial structure of level-set method (LSM), the local search is carried out. The performance of proposed TO method composed of DM and LSM is compared with the single TO method (DM or LSM) in the design problem in which the object is the determination of the rotor structure composed of permanent magnet, rotor core and flux barrier to improve the torque characteristics and the magnet demagnetization.

著者

姫野 龍太郎 藤野 清次 阿部 邦美 小野 謙二 伊藤 祥司 岡本 吉史 今村 俊幸 片桐 孝洋 伊藤 利佳 中田 真秀

出版者

独立行政法人理化学研究所

雑誌

基盤研究(B)

巻号頁・発行日

2009

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電磁界問題,量子化学計算,数値流体計算の大規模数値シミュレーションに向けて,大規模行列計算に向けた高速化,高精度化,安定化を実現し,従来手法では解きにくい問題に対する新たな求解アルゴリズムを提案した.さらに,そのようなシミュレーションを支援するために,応用問題の特性に応じたデータ構造を決定する自動チューニング技術,ジョブスケジューラによる最適な計算機資源割当て方式,任意高精度線形代数演算パッケージも開発した.