Magnetic Field Analysis for Dimensional Resonance in Mn–Zn Ferrite Toroidal Core and Comparison With Permeability Measurement

Numerical modelling of magnetic characteristics of ferrite core taking account of both eddy current and displacement current

“…Also, dielectric constant ( ε / ε 0 ) is set to reproduce complex relative permeability in the lower frequency region where the dimensional effects is negligible. A larger value is assumed for σ g because of the high conductivity in the grain and a smaller value is chosen for σ b due to the low conductivity in the grain boundary [1]. By choosing the appropriate values for D and L in a reasonable range, the constant frequency free conductivity and permittivity can be obtained by using (3) and (4).…”

“…By choosing the appropriate values for D and L in a reasonable range, the constant frequency free conductivity and permittivity can be obtained by using (3) and (4). Generally, ferrite cores are found frequency dependent [1, 2]. But sometime ferrite cores show frequency independent characteristics due to its unique material properties, considering displacement current in magnetic field analysis, pattern of equations obtained from equivalent circuit, etc.…”

“…Ferrite cores are widely used in transformers and inductors, etc. for high frequency electronic devices because of high magnetic permeability and low conductivity [1, 2, 3, 4]. In the magnetic field analyses of such magnetic devices using a ferrite core, the frequency-domain analysis is often carried out using the measured complex permeability under different frequencies.…”

“…The nonlinear magnetic characteristics can be considered in the time-domain analysis, but suitable frequency-free conductivity and permittivity for the time-domain analysis, which can represent the measured complex permeability under different frequencies, need to be investigated. In [1, 2], a coupled magnetic-circuit analysis is proposed taking account of the microstructure of ferrite core using a simple equivalent RC circuit. However, the conductivity and permittivity obtained are frequency dependent, which cannot be used in the time-domain analysis with multi-frequencies.…”

Vector Hysteresis Processes for Innovative Fe-Si Magnetic Powder Cores: Experiments and Neural Network Modeling

“…On the one hand, iron-based alloys available in form of laminations still constitute a suitable solution for the manufacturing of electrical machines and magnetic components in the industrial and energy environment [1,2]. However, to meet the requirements of power consumption for high-frequency applications, and the need of either reducing the size and the weight of the cores or creating complex geometries, other technologies have been proposed and explored, such as ferrites [3][4][5], soft magnetic composites (SMC) [6], and more recently additive-manufactured cores [7,8] and magnetic powder cores [9][10][11]. In particular, the latter one is attracting a lot of interest since it matches good magnetic properties with high workability and suitable mechanical and thermal properties.…”