线圈-薄板体系中线圈参数对电磁力的影响

基于电磁力随焊控制焊接应力应变新思想，采用ANSYS软件模拟了平面螺旋线圈一薄板体系的电磁力，分析了线圈几何参数对电磁力的影响。结果表明，电磁力主要作用于线圈在板坯的投影处。随线圈外径的减小，电磁力峰值增大，轴向力峰值位置呈线性内移。随线圈内径的增加，径向电磁力峰值增大，轴向力峰值先增大后减小，轴向力峰值位置先不变后外移。径向力换向位置随内外径的变化规律与轴向力峰值位置相似。随着导线宽度的增加，电磁力增大。在电磁力随焊控制焊接应力应变时，应该选择具有较小外径和合适内径的线圈，并需要引入磁介质，以增大电磁力。

Effect of geometrical parameters of coil on electromagnetic force in coil-sheet system

Based on the new idea of controlling welding stress with trailing electromagnetic force, the electromagnetic force in flat spiral coil-aluminum sheet system was simulated with finite element software ANSYS.Effect of geometrical parameters of coil on electromagnetic force was analyzed.The results show that the electromagnetic force acts on the location where the coil projects on the sheet. With decreasing outer diameter of the coil, the electromagnetic force peak magnitude increases and the peak position of the axial force moves linearly close to the inner side of coil.With increasing inner diameter, the radial force peak magnitude increases, the axial force peak magnitude increases first and then decreases, and the peak position of the axial force is fixed first and then moves close to outer side of coil.With increasing wire width, the electromagnetic force magnitude increases.The variation of the position, where the direction of the radial force is turned, with the inner and outer radius is similar to that of the peak position of the axial force.While controlling welding stress based on electromagnetic force, the coil with the smaller outer radius and the appropriate inner radius should be selected, and the magnetic medium is needed to enhance electromagnetic force.