 multi-stage portable coilgun
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JoeDarkon
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Fri Aug 31 2007, 01:44AM
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Registered Member #485
Joined: Sun Jul 09 2006, 01:14AM
Location: San Francisco
Posts: 36
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I am looking in to making a portable multi-stage coilgun and was wondering if I could get a decent amount of power from using 3-5 stages with 400V 330uf caps or should I get caps with larger capacity's? I want to make it hand held so I want to have smaller caps but I dont know if those caps will be too small.
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Bjørn
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Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
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Just to get an idea, grab 3% efficiency out of thin air and calculate how much energy you will get into the projectile and use it to calculate the speed of your projectile.
If you are far off you need better capacitors and/or optimal design.
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JoeDarkon
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Registered Member #485
Joined: Sun Jul 09 2006, 01:14AM
Location: San Francisco
Posts: 36
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I dont know how to do that for a multistage coilgun
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Bjørn
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Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
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Just sum the energy of all capacitors you plan to use. You are not after a correct result but after an approximation that will give you a clue about how to adjust your design.
If you have 5 stages with one 400V 330uF capacitor each you have about 130 Joules of energy, that is about 4 Joules into the projectile if your design is pretty good.
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