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Simple electromagnetic device for feeding projectiles to accelerating part of a coilgun is presented. The principle of its operation is shown in fig. 1
Fig. 1. Principle of operation of the sequential feeding system.
One can see that this is nothing else but linear electromagnetic engine - the "travelling wave" of magnetic field formed by sequence of coils provides movement of a ferromagnetic core (projectile) to intended direction.
The animations shows the single projectile being moved, but after some reflecation it becomes obvoius that the system is able to function with any amount of projectiles situated in any position inside. The feature of this feeding system is absence of moving mechanical parts and soundless. In fact this is low-power coilgun supplied not from traditional capacitors, but from low-voltage source (for instance, accumulators) directly.
The purpose of the experiment was to determine values of current, pulse durations and electric power necessary to the system operation in various space orientation.
It should had been right to use a microcontroller to form controlling signals, but I did in simpler way by using level controller IC LM3914. Provided linear ramp on its input, this IC generates the required signal sequence. Final circuit of the controlling part is depicted on fig. 2, power PCBs - on fig. 3.
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