感应线圈炮中电枢感应电流产生机理及特性

Mechanics and Characteristics of Induced Current in Armature for Induction Coil Gun

电枢感应电流方向与驱动线圈放电电流方向相反时,电枢才会受到电磁推力,因此电枢感应电流的特性将影响电枢的加速性能。介绍了电磁感应线圈发射器的工作原理,建立了感应线圈发射器的数学模型。基于电磁感应定律和楞次定律,分析了影响电枢感应电流的因素:驱动线圈电流变化和电枢运动,并给出了驱动线圈放电电流的峰值点和电枢感应电流反向点之间的关系。研究结论表明:电枢中感应电流主要由感生电流和动生电流构成;电枢在运动过程中,其感应电流的方向发生了反向,反向时刻与电枢的速度相关,电枢的速度越高,电流反向时间越早,反之越晚。

Only when the direction of induced current in armature is opposite to the discharge current in driving coil, the armature will be subject to electromagnetic thrust. Consequently, the characteris- tics of induced current in armature for induction coil launcher will affect the acceleration performance of armature. An introduction was made of the working principle of induction coil launcher with the mathe- matical model of induction coil launcher established. After that, based on the electromagnetic induc- tion law and Lenz＇ s law, an analysis was conducted of the factors affecting the induction current in ar- mature respectively： the variation of the driving current and the movement of armature. And then pre- sented was the relation between the peak point of discharge current and the reverse point of induced current. The research conclusions show that the induced current consists of induction current and mo- tional current. In addition, the direction of induced current in armature was reversed in the course of motion. However, the reverse time is related to the armature velocity. Generally, the larger the armature velocity is, the earlier the reverse time appears.