A Novel Magnetic Equivalent Circuit Model for the Corner of Inductor Core

Abstract

The accurate calculation of inductance is the most basic problem of inductor design. Based on finite element method (FEM) analysis of the flux density distribution in the corner of the core, a local corner magnetic equivalent circuit (MEC) model is proposed for a core-type inductor. In this model, the corner is divided into three parallel branches, and the joint part of the corner and the core limb are divided into two branches, one of which is continuously divided into three branches. In addition, a flux leakage branch of the core window inner corner is modeled. These branches form a local corner MEC by series and parallel to describe the flux distribution of the corner. The calculation results show that, in the local corner MEC model, the core flux density distribution is consistent with the FEM simulation. The maximum relative error of the inductance is less than 6% and the average relative error is less than 4% compared to the physical prototype measured data with the range of current from 20 A to 1000 A, which shows that the local corner MEC model has a high accuracy inductance calculation.

Comparison and analysis of testing methods for magnetic properties of oriented silicon steel sheets

“…In the actual use of iron cores, although most silicon steel sheets are only affected by the rolling magnetic field, some silicon steel sheets located at the corners of formed iron cores (such as U-shaped iron cores) are still affected by magnetic fields from different angles [19] . Due to the serious obstruction of the movement and rotation of magnetic domains during the non-rolling magnetization process of oriented silicon steel, there are significant differences in the magnetic properties of oriented silicon steel under the influence of different angle magnetic fields [20] .…”

A Novel Nonlinear Magnetic Equivalent Circuit Model for Magnetic Flux Leakage System

“…The finite element analysis (FEA) method stands out as a tool that provides accurate and precise solutions in the design of electromagnetic systems [10][11][12]. FEA can analyze complex designs incorporating magnetic materials by considering the nonlinear behavior of these materials [13].…”