Abstract
The complex interaction between material properties in an induction heating circuit was studied by multi physics simulation and by experimental verification in a full-scale laboratory heater. The work aims to illustrate the complexity of the system of interacting materials, but also to propose a method to verify properties of soft magnetic composite materials in an integrated system and to identify which properties are the most critical under different circumstances and load cases. Heat losses at different loads were primarily studied, from DC currents to AC currents at 15, 20 and 25 kHz, respectively. A FE model for magnetic simulation was correlated with a corresponding model for heat simulation. The numerical model, as well as the established input material data, could be verified through the experimental measurements. In this particular study, the current loss in the litz wire was the dominant heat source, thus making the thermal conductivity of the SMC the most important property in this material.
Highlights
Soft magnetic materials play a very important role in most electromagnetic devices, mainly to control the magnetic flux
The thermal conductivity of the soft magnetic composites (SMCs) material is important in this respect, but the thermal coupling between coil and SMC structure is critical in order to facilitate cooling of the coil through the SMC material
This study focuses on one such system, an induction heating device, which is an example of a complex system where the SMC material must be chosen and designed based on the integrated functionality
Summary
Soft magnetic materials play a very important role in most electromagnetic devices, mainly to control the magnetic flux. The demands on the soft magnetic material may vary depending on application, but low internal losses are always a requirement. These materials range from laminated structures to different kinds of powderbased materials, often called soft magnetic composites (SMCs). A well-designed electromagnetic system should have no or very low internal energy losses, but this is the seldom case in practical applications [1]. Thermal losses in both coil and SMCs must be handled by different means. There are studies that show that in many cases most of the heat is generated in the coil [2]
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