Power electronic converters play a major role in many industrial designs. The choice of the appropriate magnetic material and the analysis of the dependence of its magnetic proprieties versus the temperature are crucial for the design of magnetic components of power converters. In this work, nanocrystalline ribbons are used to perform the toroidal core simulating a convertor. We started by elaborating a theoretical model to assess the complex permeability. This model is based on Neel theory and it takes into account wall displacement and coherent rotation. Semi-analytical expressions are derived for the dynamic permeability μ⊥ (ω) in the direction perpendicular to the magnetization direction and the dynamic permeability μ(RD∥) (ω) in the direction parallel to the rolling direction. An experimental set-up has been used to measure different kinds of impedance from which the permeability is deduced versus the frequency and for several temperatures. The last step consists on the identification of some parameter using the theoretical model and experimental data. The dependence of these parameters (domain susceptibility, anisotropy energy, average domain thickness, and angle between the magnetic field and the magnetization) versus the temperature is analyzed. These parameters are expected to be valuable in the design of a converter.
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