电磁发射用脉冲电抗器端面电磁力计算

Calculation of Electromagnetic Force on End Face of Pulsed Reactor for Electromagnetic Launch

为研究电磁发射武器中脉冲功率源内部电抗器端面的薄金属板所受电磁力,建立了电抗器磁场及金属板上感应涡流的简化模型,分析了脉冲放电时的电抗器磁场、矢量磁位、金属板上感应涡流以及电抗器与金属板之间的电磁力,得出解析计算式,并绘出涡流密度分布图及电磁力曲线。分析结果表明,感应电流分布与金属板大小有关,板边缘受电磁力影响较大,容易发生变形;受到激励电流和感应电流的共同影响,金属板所受电磁力在激励电流上升沿到达峰值,在感应电流为0时电磁力为0,之后衰减直至反向峰值。

To study electromagnetic force on a sheet metal located on the pulsed reactor end in the pulsed power supply module for electromagnetic launch, the simplified model was established based on the electromagnetic field features of pulsed reactor and the characteristics of the eddy current on sheet metal. The electromagnetic field, the magnetic vector potential of pulsed reactor and the distribution of the eddy current on sheet metal were analyzed. The theoretical formula of electromagnetic force was obtained. The results show that the distribution of induced current is related to the size of metal plate; the electromagnetic force on the edge is larger than that at any other position of the plate. The electromagnetic force reaches the positive peak while the discharging current rising up, and the force is zero when the induced current reaches zero, and then the force reaches the negative peak when the discharge current reaches the reverse maximum.