Abstract
Abstract The external circuit of synchronize induction coil catapult can be equivalent to R-L-C circuit with freewheeling diode, the resistance directly affects the current and efficiency. In order to improve the performance of the catapult, the final launching speed can be increased in a certain range by the means of reducing the resistance of discharge circuit or increasing the resistance of freewheeling circuit. In this paper, Maxwell two-dimensional transient simulation model and single-stage coil ejection test of two kinds of coils with different turns was used to verify the influence of the external circuit. The research show that, the driving coil current and the electromagnetic force on armature can be increased effectively by reducing the resistance of discharge circuit, the launch speed which the armature is separated from the load is improved; the armature drag effect can be reduced by putting resistance in freewheeling circuit according to coil resistance, the final speed which the armature is connected to the load is improved, so the ejection performance is optimized.KeywordsInduction coil catapultDischarge circuitFreewheeling circuitLaunching performance
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