Optimum design of driving circuit parameters for magnetic-resistance coil launcher

In order to mitigate the brake action of the projectile and to obtain high launch velocity or launch efficiency in working process of magnetic-resistance coil launcher (MRCL), the influences of crowbar resistance on each branch current of the driving circuit and the acceleractive characteristics of nine kinds of different working cases are investigated by means of finite element analysis method. The influences of the capacitance, the initial working voltage of the stored energy capacitor and the crowbar reistance on the acceleractive characteristics of MRCL are analyzed. Research showes that the value of the crowbar resistance has effects on the automatical transform process of driving circuit and the attenuation ratio of the driving current after the complete transform process of the driving circuit and that the quick attenuation of the driving current is helpful to lessen the brake action. A group of the driving circuit parameters that can remarkably lessen the brake action and enchance launch efficiency is obtained. These work has some instructing significance for the optimum design of magnetic-resistance coil launcher.