Improved Magnetic Equivalent Circuit with High Accuracy Flux Density Distribution of Core-Type Inductor

Xiaodong WANG  Lyes DOUADJI  Xia ZHANG  Mingquan SHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E103-C   No.8   pp.362-371
Publication Date: 2020/08/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2019ECP5042
Type of Manuscript: PAPER
Category: Electronic Components
Keyword: 
modeling,  inductors,  magnetic flux leakage,  finite element methods,  magnetic equivalent circuit,  

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Summary: 
The accurate calculation of the inductance is the most basic problem of the inductor design. In this paper, the core flux density distribution and leakage flux in core window and winding of core-type inductor are analyzed by finite element analysis (FEA) firstly. Based on it, an improved magnetic equivalent circuit with high accuracy flux density distribution (iMEC) is proposed for a single-phase core-type inductor. Depend on the geometric structure, two leakage paths of the core window are modeled. Furthermore, the iMEC divides the magnetomotive force of the winding into the corresponding core branch. It makes the core flux density distribution consistent with the FEA distribution to improve the accuracy of the inductance. In the iMEC, flux density of the core leg has an error less than 5.6% compared to FEA simulation at 150A. The maximum relative error of the inductance is less than 8.5% and the average relative error is less than 6% compared to the physical prototype test data. At the same time, due to the high computational efficiency of iMEC, it is very suitable for the population-based optimization design.