Influence of Driving Current's Wave on Accelerative Performance of Induction Coil Launcher

Abstract

It is a goal for the investigator pursuing to how to improve the efficiency of the induction coil launcher (ICL). In order to enhance the efficiency, the influences of the driving current's wave on the accelerative performance in single-stage ICL are investigated. Combined the bipolar driving manner and the single-polar driving manner, the dynamic working process of the single-stage induction coil launcher are simulated. The waves of the driving current and the waves of the armature's force, speed and position are presented. For the two driving manner, the waves of their corresponding driving current are not identical. The driving current in the bipolar driving manner is bipolar, and the driving current in the single-polar driving manner is single-polar. Under the condition of the bipolar driving manner, the armature will be decelerated because of the braking force when it has not been leaved from the driving coil completely. Under the condition of the single-polar driving manner, the armature will be suffered from the action of the braking force when it has leaved from the driving coil completely. Therefore the braking force will be produced lower negative effect in the single-polar driving manner than in the bipolar driving manner, which means that higher efficiency is achieved from the single-polar driving manner. Under the same working conditions (Z=5, C=1000 mu F, f/=3000V), the maximum velocities obtained in the bipolar driving manner and in the single-polar driving manner are 7.8 m/s and 14.0008 m/s respectively. Analysis shows that the braking effect of the armature is not only related with the driving current wave but also with the armature's position.