Abstract
An advanced 2D model of electromagnetic launcher is presented respecting the influence of eddy currents induced in the accelerated ferromagnetic body. The time evolution of electromagnetic field in the system, corresponding forces acting on the projectile and time evolutions of its velocity and current in the field circuit are solved numerically using own application Agros2d. The results are then processed and evaluated in Wolfram Mathematica. The methodology is illustrated with an example whose results are discussed.
Highlights
Devices working on the principle of electromagnetic launching have been known more than 150 years
For the accuracy of results the decisive role is played by the correctness of the time evolution of current i in the field coil
The red lines are the dependences without respecting eddy currents in the projectile, the blue ones represent them
Summary
Devices working on the principle of electromagnetic launching have been known more than 150 years. For example, electromagnetic actuators of various constructions, parts of switching gears, electromagnetic guns, and many others Despite their relatively simple construction, their design and modeling is not an easy business because of the presence of nonlinear structural elements; some of them, move. The first attempts to design and build a magnetic coil gun were only based on more or less sophisticated experiments, which is the way able to provide a functioning device, but mostly with poor operation parameters. This part of a rather old history is well summarized and documented in [1]
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