Magnetic-Structural Coupling Analysis of Armature in Induction Coil Guns

Armature is a key component in induction coil gun and it would be destroyed by enormous electromagnetic force in the working process.It is necessary to design armatures of high strength in order to further investigate the test of induction coil gun.Mathematical model of magnetic-structure coupling of the armature was built.With finite element analysis code,magnetic-structure coupling analysis was accomplished for the purpose of analyzing distribution laws of eddy,magnetic force,deformation and stress.The varying laws of stress in armature resulting from the thickness changing was analyzed.Simulation results show that the non-uniform distribution of magnetic flux density and eddy in armature occurs and the maximum value of magnetic flux density,eddy,magnetic focrce and deformation lies in the tail of armature.The biggest stress occurs at the inner side of cylinder armature tail and the biggest stress decreases with the thickness of armature tail increasing.In the engineering project,the reinforcement of the armature mechanical strength should be designed to improve the performance of induction coil gun.