Temperature-dependent hysteresis model for soft magnetic materials
2019
Purpose – To understand the behavior of the magnetization processes in ferromagnetic materials in
function of temperature, a temperature-dependent hysteresis model is necessary. This study aims to
investigate how temperature can be accounted for in the energy-based hysteresis model, via an appropriate
parameter identification and interpolation procedure.
Design/methodology/approach – The hysteresis model used for simulating the material response is
energy-consistent and relies on thermodynamic principles. The material parameters have been identified by
unidirectional alternating measurements, and the model has been tested for both simple and complex
excitation waveforms. Measurements and simulations have been performed on a soft ferrite toroidal sample
characterized in a wide temperature range.
Findings – The analysis shows that the model is able to represent accurately arbitrary excitation
waveforms in function of temperature. The identification method used to determine the model parameters
has proven its robustness: starting from simple excitation waveforms, the complex ones can be simulated
precisely.
Research limitations/implications – As parameters vary depending on temperature, a new parameter
variation law in function of temperature has been proposed.
Practical implications – A complete static hysteresis model able to take the temperature into
account is now available. The identification is quite simple and requires very few measurements at
different temperatures.
Originality/value – The results suggest that it is possible to predict magnetization curves within the
measured range, starting from a reduced set of measured data.
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