Effects of multi-core structure on magnetic losses and magneto-mechanical vibration at high frequencies

This paper investigates the magnetic properties of Fe-based amorphous material Metglas® 2605-HB1, SA1, and new high induction HB1-M amorphous material around 1.64 Tesla, which one of core component structured with hybrid thin film materials is obtained. Different core types in constructive modeling and magnetic field simulation are studied by the finite element method (FEA). According to the simulation results, the magnetic flux lines passing through different bending angles of core corners have induced different magnetic performances. Results suggest that a long and straight core leg for a multi-angled core can help to reduce magnetostriction variation, which the multi-angles of core corners to be an important factor in the reduction of magnetostriction variation and improving magnetic property. The experimental results in magnetism of the core are shown at different frequencies ranging from 60 Hz to 3000 Hz. The magnetism of the triangular core is significantly better than that of its counterpart, the multi sharp-angled structure, demonstrating less significant reductions of the magnetic properties in terms of core loss, core vibration, and sound level. In addition, a hybrid-type core structure with NHI material is used to both improving magnetic properties while reducing magnetic loss; however, magnetism in terms of sound level and core vibration is shown to be difficult to control. Actually, it is well-know that the ferrite core construct with multi-cored structure would reduce the eddy current loss due to the stacking process in laminated silicon-steel cores. According to the experimental results, it has shown the difference in eddy current field for soft material is not only the key factor in both of the resistance and permeability factor, actually, but also decided by the permittivity. It is interested the soft material has increased the frequencies form hundred to kilohertz, for iron-based material, the hysteresis loss in magnetic power loss is sign- ficant, but, the eddy current loss is much more smaller due to the lower conductivity of amorphous material. Therefore, the reduction in magnetic core loss for multi-cored structure is significant to reduce the loss due to different core structure in permittivity.