Application of Current Filament Method on the Calculation of Current and Force in Electromagnetic Forming
Li Zhenhao1, 2, Cao Quanliang1, 2, Lai Zhipeng1, 2, Han Xiaotao1, 2, Li Liang1, 2
1. Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan 430074 China; 2. School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Abstract：Accurate calculations of coil current and electromagnetic force in the workpiece in electromagnetic forming (EMF) system are essential to analyze the dynamic behavior of workpiece and optimize electromagnetic parameters. By now, finite element method (FEM) has been widely applied to simulate these two parameters. However, when the coupling analysis of electromagnetic and structure fields is carried out using FEM, large or complicated workpiece deformation can easily cause the air mesh distortion, which leads to low accuracy, poor convergence and long simulation time. Therefore, this paper studies the calculation of coil current and electromagnetic force in workpiece in EMF based on current filament method (CFM). Taken the numerical results by COMSOL as references, comparative analysis of the conventional and improved CFMs is carried out. The results show that the improved CFM proposed in this work can reflect the distribution characteristics of coil current and electromagnetic force in workpiece more accurately with considering the skin effect. It is because the computational accuracy of mutual inductances as well as their gradients of each current filament in the equivalent circuit has been improved when each coil turn was divided into several parts. On this basis, the validity and applicability of the proposed method for EMF are verified by analyzing the computational performance under different discharge frequencies, coil conductor sizes and workpiece geometries.
黎镇浩, 曹全梁, 赖智鹏, 韩小涛, 李亮. 电流丝法在电磁成形线圈电流和工件电磁力计算中的应用[J]. 电工技术学报, 2018, 33(18): 4181-4190.
Li Zhenhao, Cao Quanliang, Lai Zhipeng, Han Xiaotao, Li Liang. Application of Current Filament Method on the Calculation of Current and Force in Electromagnetic Forming. Transactions of China Electrotechnical Society, 2018, 33(18): 4181-4190.
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2018, Vol. 33 
