Influences of Single Stage Inductive Coilgun's Peripheral Circuit on Armature Capture Effect
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摘要: 由楞次定律可知，在感应线圈炮发射的过程中，为阻止驱动线圈剩余电流减小，电枢上涡流将产生与驱动线圈同向的磁场，此时电枢受捕获效应的影响而感应出减速力，使电枢的出口速度减小，发射效率降低。为减弱电枢捕获效应的影响，可在放电回路串接电阻或电容。通过理论和仿真，分析了改进后的外围电路对减弱电枢捕获效应的效果，并搭建单级感应线圈炮实验系统进行了验证。研究发现，在放电回路串接一个合适的大电阻或小电容，能加快驱动线圈剩余电流的释放，有效减弱电枢捕获效应，从而提高了电枢的出口速度，改善了感应线圈炮的发射性能。Abstract: According to Lenz's law, to prevent the drive coil current from decreasing during the launching process of coilgun, the magnetic field generated by the armature eddy current is in the same direction with the drive coil.And affected by the capture effect, the armature will induce a deceleration force, which reduces its muzzle velocity and the launching efficiency.In order to reduce the influence of armature capture effect, a resistor or a capacitor was connected in series in the discharge circuit.Based on the theory and simulation, we analyzed the effect of the improved peripheral circuits on reducing the armature capture effect, which was verified by building a single-stage coilgun experimental system.This study found that a suitable big resistor or small capacitor connected in series in the discharge circuit can speed up the release of the remaining current of the drive coil, effectively reduce the armature capture effect, increase the armature's muzzle speed, and improve the coilgun's launching performance.
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图 3 不同放电电阻下感应线圈炮的瞬态仿真结果
Figure 3. Transient simulation results of inductive coilgun with different discharge resistances
图 4 不同放电电容下感应线圈炮的瞬态仿真结果
Figure 4. Transient simulation results of inductive coilgun with different discharge capacitances
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