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• W2550673076 abstract "Abstract „Lumped magnetic circuit provides possibilityfor fast transient simulation of magnetic component togetherwith power electronics circuit. The simpli“ed geometryrepresentation however is not able to completely re”ect thereal “eld distribution, especially when material nonlinearityis included. To model electrical characteristic of the magneticcomponents closer to the reality, special treatment is needed todetermine geometrical parameters of the lumped representation.In this paper, modeling of the curved areas (e.g. core corners)based on permeances is presented and compared with FEMsimulations.Index items„magnetic modeling, permeance, saturation I. I NTRODUCTION Inductive components usually use magnetic core materialto guide magnetic ”ux. Finite-element-method (FEM) is ableto represent the core geometry and solve the “eld distributionaccurately. However, this type of model is computationallyexpensive if incorporated into circuit simulation. In compar-ison, lumped magnetic circuit approach is able to achievehigh simulation speed, for which reluctance- and permeancerepresentation are available today. The permeance represen-tation proposed in [1] can be solved by ordinary differentialequation (ODE) solver without any time-consuming iterations,and is therefore preferred for system-level power electronicsimulations [2]. However, the simpli“cation of core geometryrequired by the lumped modeling approach may result inconsiderable error, if the materials nonlinearity should beconsidered.In lumped magnetic circuit, complex core geometry canbe split into segments, where each segment represents acertain part of the core. Typical example is the three-legtransformer core with parallel connection of reluctances [3].The reluctance values were determined by “tting the data fromthe externally measured electrical characteristics (e.g. open-circuit and short-circuit test). Work of [4] and [5] transformedthe magnetic circuit back to electrical equivalent circuit. Inthese publications however, the direct relationship between thelumped component value (permeance or reluctance) and thecore-geometry parameters was not utilised.To make use of this relationship, single segment is char-acterised by three parameters, namely the geometry-relatedcross section area A and magnetic path length l, as wellas material-related permeability µ. Geometry parameters can" @default.
• W2550673076 created "2016-11-30" @default.
• W2550673076 creator A5003377292 @default.
• W2550673076 date "2015-01-01" @default.
• W2550673076 modified "2023-09-27" @default.
• W2550673076 title "Permeance Based Modelling of the Core Corners Considering Magnetic Material Nonlinearity" @default.
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