Soft magnetic composites (SMCs), which are made of insulated magnetic powder via conventional PM compaction, offer several advantages over traditional laminated steel cores. One of them is that the size and weight of magnetic parts can be reduced by designing a three-dimensional magnetic circuit which utilizes the magnetic isotropy. SMCs have been applied for several power supply parts, however further improvement of magnetic properties is required for the expansion of SMCs application. The magnetic properties in SMCs are affected by some characteristics of magnetic powder. In our previous study [1], it was demonstrated that the particle size of iron powder has an influence on magnetic properties in SMCs for high frequency application in the range of several 10 kHz. This study reports the influence of apparent density of iron powder on magnetic properties of SMCs. In our research, it was shown that core loss decreased with increasing apparent density of iron powders under the condition that distortions after compaction were eliminated by heat treatment at 600°C.
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