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Finite-element analysis of turbine generator using homogenization method taking account of magnetic anisotropy

Ryoko Minehisa (Department of Electrical Engineering, Doshisha University, Kyotanabe, Japan)
Yasuhito Takahashi (Department of Electrical Engineering, Doshisha University, Kyotanabe, Japan)
Koji Fujiwara (Department of Electrical Engineering, Doshisha University, Kyotanabe, Japan)
Norio Takahashi (Toshiba Energy Systems and Solutions Corporation, Kawasaki, Japan)
Masafumi Fujita (Toshiba Energy Systems and Solutions Corporation, Kawasaki, Japan)
Kazuma Tsujikawa (Toshiba Energy Systems and Solutions Corporation, Kawasaki, Japan)
Ken Nagakura (Toshiba Energy Systems and Solutions Corporation, Kawasaki, Japan)

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering

ISSN: 0332-1649

Article publication date: 7 August 2019

Issue publication date: 21 October 2019

Abstract

Purpose

This paper aims to propose a homogenization method considering magnetic anisotropy for a magnetic field analysis of a turbine generator. To verify the validity of the proposed method, the effects of magnetic anisotropy and a space factor on a no-load saturation curve and no-load iron loss of the turbine generator are discussed.

Design/methodology/approach

The proposed method was derived from the combination of the homogenization of microscopic fields in a laminated iron core with the modelling of two-dimensional magnetic properties based on free energy. To verify the validity, the proposed method was applied to a finite-element analysis of a simple ring core model. Finally, a no-load saturation curve and iron loss of the turbine generator was investigated by using the proposed method.

Findings

The computational accuracy of the homogenization method considering magnetic anisotropy is almost the same as that of the detailed modelling of the laminated structure in the magnetic field analysis of the laminated iron core. Furthermore, it is clarified that magnetic anisotropy does not have a large influence on the no-load saturation curve of the turbine generator because of the large air gap. On the other hand, the space factor affects the shape of the no-load saturation curve.

Originality/value

This paper verifies the validity of the homogenization method considering magnetic anisotropy method and elucidates the effects of magnetic anisotropy and a space factor on no-load characteristics of the turbine generator.

Keywords

Citation

Minehisa, R., Takahashi, Y., Fujiwara, K., Takahashi, N., Fujita, M., Tsujikawa, K. and Nagakura, K. (2019), "Finite-element analysis of turbine generator using homogenization method taking account of magnetic anisotropy", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 38 No. 5, pp. 1614-1626. https://doi.org/10.1108/COMPEL-12-2018-0522

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited