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Hello, I'm quite new to this technology, but I'm trying to understand the theory of magnetic forces.
I'm trying to build a system where a projectile (x inch ball) needs to be fired vertical to a speed of y feet/second. This is to be done with use of 5 coils in a row. Each needs to accelerate the ball so that the eventual speed is achieved.
How can I determine: - The magentic power needed from each coil. - The size of the coil - The current needed in the coil.
Registered Member #90
Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301
Tim wrote ...
I'm trying to build a system where a projectile (x inch ball) needs to be fired vertical to a speed of y feet/second. This is to be done with use of 5 coils in a row. Each needs to accelerate the ball so that the eventual speed is achieved.
How can I determine: - The magnetic power needed from each coil. - The size of the coil - The current needed in the coil.
Welcome to the forums!
You'll want to start with the basic energy budget needed for the ball. Given mass and required initial velocity, you'll know the kinetic energy required. Divide this by the number of coils to get the kinetic energy needed from each coil.
Multi-stage coilguns can reliably impart a certain amount of kinetic energy per stage. That is, if each stage has the same capacitor (joules of stored energy) then you can design a series of coils each with its own timing to add about the same kinetic energy each time. The point is, each stage can provide the same change in kinetic energy; this not the same as "the same change in velocity".
Having done that groundwork, the hard part is choosing each coil's inductance and timing. I suggest designing and building the first stage alone to learn the process and discover what efficiency is achievable for your chosen approach.
Cheers, Barry Any intelligent fool can make things bigger and more complex... It takes a touch of genius to make difficult things simple.
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What magnetic force do I need
