Cogging Torque Estimation of Permanent Magnet Motors Resulting from Magnetic Anisotropy of Non-oriented Electrical Steel Sheets

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  • Daikoku Akihiro
    Mitsubishi Electric Corporation, Advanced Technology R&D Center
  • Yamaguchi Shinichi
    Mitsubishi Electric Corporation, Advanced Technology R&D Center
  • Toide Yukari
    Mitsubishi Electric Corporation, Advanced Technology R&D Center
  • Fujiwara Koji
    Department of Electrical and Electronic Engineering, Division of Industrial Innovation Sciences, The Graduate School of Natural Science and Technology, Okayama University
  • Takahashi Norio
    Department of Electrical and Electronic Engineering, Division of Industrial Innovation Sciences, The Graduate School of Natural Science and Technology, Okayama University

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Other Title
  • 無方向性電磁鋼板の磁気異方性に起因する永久磁石モータのコギングトルクの検討
  • ムホウコウセイ デンジ コウハン ノ ジキ イホウセイ ニ キイン スル エイキュウ ジシャク モータ ノ コギングトルク ノ ケントウ

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Abstract

This paper examines the cogging torque of permanent magnet motors resulting from the magnetic anisotropy of non-oriented steel sheets used for magnetic core. The cogging torque due to the magnetic anisotropy is calculated by FEM using two modeling methods; one is the newly developed method which takes account of the two-dimensional magnetic properties in arbitrary directions, and the other is the conventional method which uses only two magnetization curves both in rolling and transverse directions. In the proposed method, the measured magnetic properties are treated in two different ways; in the first way the data are used directly, and in the second way the data are interpolated using Bèzier surface. As a result, all of three models show the cogging torque component resulting from the magnetic anisotropy, that has less pulsation numbers per rotation than that of isotropic model. The difference of the cogging torque amplitude between the three models is small in the region of low magnetic flux density, however, it gradually becomes large along with the increase in magnetic flux density. The measured results of cogging torque is proximate to the results calculated by two-dimensional magnetic property method using the magnetic property data directly. The error is approximately 4% at the point where the cogging torque component resulting from the magnetic anisotropy is maximum.

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