Multi-stage induction coilguns is one of the electromagnetic launchers. There are many theoretical and experimental studies that focus on low-velocity, large mass, but fewer studies about high- velocity launch. It is necessary to study the problem of high- velocity launch. As high- velocity, large-mass will inevitably lead to launch systems of the multi-stage induction coilguns scale larger. Accurate analysis of multi-stage induction coilgun is usually necessary to establish full-size finite element model. Full-size finite element model is accurate and comprehensive, but the model is complex, poor general, computing time increases with the coil from the geometric progression in multiples of increase cannot solve the problem quickly. It is necessary to find a way to ensure both accuracy as well as rapid calculation. In this paper, presents a calculation method about multi-stage coilgun with a muzzle velocity, full-size model is decomposed into a number of smaller multi-stage coil gun model, by the calculation of small-scale coilguns fitted full-size multi-stage coilgun performance. The scale is larger and the value of the method is greater. Finally, as an example a 160-stage coilgun, stored energy of 31MJ, which can accelerate 5kg projectiles to 2040m/s muzzle velocity, Muzzle kinetic energy of 10MJ, efficiency of m6ore than 30%, It shows that multi-stage induction coilgun can launch high-velocity. A more detailed study will be presented in this paper.
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