电磁轨道炮电枢前感应磁场特性及其受力分析

Characteristic Analysis of Magnetic Field Before Armature and Its Magneto-Dynamic Effect on Armature of Electromagnetic Railgun

电枢是电磁轨道炮中核心运动部件,也是将轨道炮系统电磁能转化为弹丸动能的媒介,电枢前的感应磁场、通流电流是推动电枢运动的根本原因,也直接决定了轨道炮系统的能量转化率。暂未考虑轨道电阻、电流趋肤效应等影响,基于面电流假设,建立了电枢前电磁感应强度场计算模型,以及电枢所受电磁力模型,基于仿真结果,研究了电枢前感应磁场强度分布特性,分析了轨道通流长度对感应磁场及电枢受力的影响。

Armature is the critical moving part of electromagnetic railgun,which is also the intermediary that converts electromagnetic energy of the railgun into kinetic energy of the projectile.The current and induced magnetic field in front of the armature are the fundamental reasons for the armature movement and directly determine the energy conversion rate of the railgun system.Based on uniform current hypothesis,the electromagnetic force model of the armature and the calculation model of electromagnetic induction intensity field in front of armature are established without considering the rail resistance and current skin effect.Based on the simulation results,the characteristics of magnetic induction intensity field are studied,and the effects of current length on armature magneto-dynamic force are analyzed.