Distributed current source modeling method for 3D eddy current problem in magnetic conductor with discrete state-space J-φ formulation

JOURNAL OF COMPUTATIONAL PHYSICS

卷:401

Article

Hao, Bingjie¹  Lee, Kok-Meng^1,2  Bai, Kun¹ 

[1] Huazhong Univ Sci & Technol, State Key Lab Digi Manuf Equip & Tech, Wuhan 430074, Hubei, Peoples R China

[2] Georgia Inst Tech, Woodruff Sch Mech Eng, Atlanta, GA 30332 USA

关键词: Eddy current;    Magnetic material;    State space model;    Current sources;   

DOI  :  10.1016/j.jcp.2019.109027

来源: Elsevier

【 摘 要 】

This paper presents a distributed-current-source (DCS) modeling method to analyze the eddy-current (EC) induced in an electrically conductive material with a weak magnetic permeability. Formulated in state space to solve for an unknown EC density Jand electric potential., the method decomposes the conductor into elemental volume/surface current sources to model the eddy-current and magnetization effects. The closed-form solutions to a three-dimension (3D) EC problem with geometrical boundary effects are derived and verified by comparing with finite-element methods and published data, both numerically and experimentally. An element-refinement method, which accounts for the skin-depth effects and non-uniform boundary EC, is proposed and validated. The DCS modeling method has been applied to a field-reconstruction application for parametric analysis demonstrating its effectiveness and efficiency. (C) 2019 Elsevier Inc. All rights reserved.

【 授权许可】

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