Influences of Single Stage Inductive Coilgun's Peripheral Circuit on Armature Capture Effect

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.