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Giant Magnetostrictive Materials for Field Weakening: A Modeling Approach

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2 Author(s)
Guillaume Krebs$^{1}$ Laboratoire de Génie Electrique de Paris (LGEP),, SUPELEC, CNRS (UMR 8507), UPMC, Univ Paris-Sud,, Gif-sur-Yvette Cedex,, France ; Laurent Daniel

In this paper, a proposal for a field weakening method for a permanent-magnet synchronous motor is evaluated. The method consists in inserting giant magnetostrictive elements between permanent magnets. The magnetic permeability of these magnetostrictive parts is modified when the speed increases. The field leakages around the permanent magnets are consequently increased, thus reducing the electromotive forces in the armature windings. An original modeling approach, based on the concept of equivalent stress, is proposed in order to evaluate this field weakening solution.

Published in:

IEEE Transactions on Magnetics  (Volume:48 ,  Issue: 9 )