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Cogging-force-reduction techniques for linear permanent-magnet machines

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4 Author(s)
Wang, J. ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK ; Inoue, M. ; Amara, Y. ; Howe, D.

The paper describes two techniques for reducing the cogging force associated with the finite length of the ferromagnetic armature core of a tubular permanent-magnet machine. Analytical expressions for predicting the cogging force which is associated with armature cores having skewed or stepped end faces are established, and a cogging-force-minimisation technique is employed to determine an optimal armature-core length. The validity of the analytical cogging-force predictions and the effectiveness of the cogging-force-reduction techniques are verified by three-dimensional finite-element analyses and experimental measurements.

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Electric Power Applications, IEE Proceedings -  (Volume:152 ,  Issue: 3 )