Analysis on Electromagnetic Mechanics in Electromagnetic Railgun

Based on rectangle armature and simple rail,2D finite element calculation model was established to solve the diffusion problems of current and magnetic field in electromagnetic railgun.The model did not take account of the deformation of rail and armature.The velocity skin effect resulted from armature movement was analysed.With the increase of relative rate of rail and armature,the velocity skin effect of magnetic field and current were more obvious.When the velocity is more than 1 000m·s-1,magnetic field and current concentrated to distribute in very small area on the inner surface of rail and back surface of armature.The continuing increase of relative rate did not make magnetic field distribution to change obviously.The magnetic field and current distribution under condition of static and complex armature structure were calculated by use of ANSYS software,and U shape armature structure showed to have evident improving effect for eliminating excessive concentration of magnetic field and current near the interface of rail and armature.