Abstract
The geometry effect on the bulk magnetic properties of MnZn ferrite toroidal cores produced by the ceramic method was investigated. The MnZn ferrite powder was pressed at two different toroidal sizes and sintered, under controlled atmosphere at different temperatures. The MnZn ferrites cores were characterized according to their magnetic losses, electrical resistivity, initial permeability and Curie temperature. The total loss (200 mT, 100 kHz) in the small cores S (aspect ratio (AR)=2.84) is lower compared with the total loss in the large cores L (AR=0.79). These results show an agreement with the geometry effect observed on electrical steels.
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