Abstract
The exit velocity of the projectile in an induction coilgun has been found to be lower than the theoretical maximum velocity that can be achieved after giving allowance for the effects due to drag etc. This has been attributed to the "armature capture effect," which comes into play because of the current reversal happening in the projectile. In this paper it is shown that the reduction in the projectile velocity can be arrested if the coil current is commutated at the right time. An SCR-based switching circuit for the coil current has been implemented in the induction coilgun under development in the authors’ laboratory. This paper describes the SCR commutation circuit topology to commutate the coil current for an induction coilgun operating at high voltage and high current and compares the results obtained with and without the current commutation.
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