Caractérisation des propriétés électromagnétiques des matériaux magnétiquement doux : application aux roues polaires de machine à griffes

Abstract : Electrical energy conversion devices are based on the use of electromagnetic properties of iron and its alloys. Therefore, an accurate knowledge of these properties is required for the designers. The characteristics of the soft magnetic materials, typically those of a claw pole rotor, can be significantly impacted by the manufacturing processes. Consequently, these properties must be characterized directly on the manufactured magnetic piece. In this work, a non-destructive measurement method combining an operative approach and the finite element simulation is proposed to characterize the local electrical conductivity of the claw pole rotor. The choice of the experimental parameters associated to the claw pole rotor geometry is optimized using the Ishikawa diagram. Then, the measurement uncertainty is determined using two different approaches. This method is applied to perform a study on a population of claw pole rotors issued from the manufacturing chain. Secondly, the method is extended to incremental permeability measurement. Tests on thick sheets were realized to validate the proposed approach with the same type of sensor. Moreover, a complementary study in 3D finite element has emphasized the limitations of the analytical approach, especially when the permeability of the plate and its thickness become significant. Finally, this method is applied to the case of claw pole rotors through a qualitative approach for a quality control application.
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Laure Arbenz. Caractérisation des propriétés électromagnétiques des matériaux magnétiquement doux : application aux roues polaires de machine à griffes. Electromagnétisme. Ecole nationale supérieure d'arts et métiers - ENSAM, 2016. Français. ⟨NNT : 2016ENAM0010⟩. ⟨tel-01316557⟩

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