磁阻发射器电磁制动力抑制方法

Depression Method for the Electromagnetic Brake Force in Magnetic Reluctance Launcher

分析了磁阻发射器系统组成和工作原理;基于有限元软件,构建了磁阻发射器的仿真模型。对比分析了断路法和限流电阻法对削弱电磁制动力、提高弹丸出口速度的效果;通过仿真和试验研究了不同限流电阻对弹丸速度的影响。研究结果表明:断路法和限流电阻法均可削弱弹丸受到的电磁制动力,从而提高弹丸出口速度,但前者会产生很大的反向电动势,对驱动线圈绝缘强度产生影响;此外,限流电阻不是越大越好,当其达到临界值时,继续增大电阻,弹丸速度不再变化。

The structure and the working principle of the reluctance launcher are analyzed,and then the simulation model of reluctance launcher based on FEM is built.The effects of broken circuit method and current-limiting resistance method of weakening the brake force and improving muzzle velocity of projectile are analyzed by contrast.Furthermore,the effects of different current-limiting resistance on muzzle velocity of projectile are studied by simulation and experiment.The research results show that both the broken circuit method and current-limiting resistance method are useful to decreasing the brake force and increasing the muzzle velocity of projectile.However,the former may cause high reverse electromotive force,which is negative to the dielectric strength of driving coil.Moreover,the current-limiting resistance is not the larger,the better.As the current-limiting resistance reaches to the critical value,it continues to increase and the muzzle velocity of projectile does not change.