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Abstract
The most common method for the electrical steel sheet characterization uses the Epstein frame. However, in the case of high-temperature characterization, the standard Epstein frame is not adapted to high temperature measurements. This paper deals with the design of an Epstein frame adapted for high temperature measurements, up to 600 °C. In a first step, the results at ambient temperature obtained between the normalized Epstein frame and the high-temperature device for different frequencies are compared in order to validate the new frame. The second step is dedicated to the characterization of soft ferromagnetic materials in high temperature, up to 600 °C and for different frequencies. Moreover, the effect of sheet thickness on their behavior has been studied at high temperatures. The obtained measurement results confirm the strong influence of both temperature and thickness on power losses.
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