Analysis of inductive coil gun performance based on field coupling circuit method

Inductive coil gun´s performance analysis is very important for experimental research and its electromagnetic optimization design. Circuit simulation is carried out based on current filament model, the government equations of current filament model may boil down to initial value problem of nonlinear variable coefficient ordinary differential equations, which can be solved by numerical method and is easy to program. From circuit simulation, the dependence of system performance on variable parameter can be found. Field model is built based on composite grid method; composite grid method uses two sets of mutual independent grids to discrete solution region, it overcomes the trouble of remeshing in normal finite element technique based on one set of grid. In this paper performance analysis of three stages coaxial inductive coil gun is carried out based on field coupling circuit method. Three dimensional moving conductor eddy current field simulation of coil gun is realized, field variables distribution in the launching process is obtained. By comparing the results of circuit model and field model the validity of the two models is proved.