Affiliations: [a] Fluxtrol Inc., Auburn Hills, MI, USA
Correspondence:
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Corresponding author: Robert C. Goldstein, Fluxtrol Inc. 1388 Atlantic Blvd, Auburn Hills, MI 48326, USA. Tel.: +1 248 607 0686; Fax: +1 248 393 0277; E-mail: rcgoldstein@fluxtrol.com
Abstract: Many induction heating coils use soft magnetic composite materials (SMC) to improve induction heating system performance. In demanding induction heating applications, the core loss in the soft magnetic composite material is one of the critical factors in predicting the reliability of the induction coil using computer modelling. In this paper we have used calorimetry method for experimentally determining core losses in SMCs up to ≈1 T magnetic flux densities at a frequency near 150 kHz. This paper contains a discussion on the limitations of current methods for calculating core losses. To address these limitations, a new method for calculating core losses is presented. The results of the core loss measurement did not fit well with traditional core loss models over the full range of magnetic flux densities. A discussion on the different models and a hypothesis for the source of the variation from the models is presented.
Keywords: Soft magnetic composite (SMC), iron core losses, Steinmetz equation, Bertotti’s equation
