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Registered Member #619
Joined: Sat Mar 31 2007, 05:26AM
Location: San Jose, CA
Posts: 16
Hi. I've been shopping for some caps for my coilgun project and i found some fairly cheap 3,300uf 300v filter caps. Would those (being filter caps) be suitable for coilgun use? Sorry if this is a dumb question. I tried a search and got nothing.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
They are a little big capacatance wise (will need a low inductance/resistance coil to reduce suckback) for their voltage, but in general they should work just fine
Registered Member #619
Joined: Sat Mar 31 2007, 05:26AM
Location: San Jose, CA
Posts: 16
... wrote ...
They are a little big capacatance wise (will need a low inductance/resistance coil to reduce suckback) for their voltage, but in general they should work just fine
Registered Member #16
Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
In general, just about any capacitor can be used for a coilgun. The type and values of the capacitor kind of dictates what approach you should take when designing it though.
Big filter capacitors like that don't like super fast rise times, or ultra high currents. They tend to have a relatively high ESR that can limit discharge current quite a bit, and contribute to substantial heating of the capacitor. The large capacitance is going to mean the discharge is going to last longer, and could cause suckback.
To minimize these problems, going for longer coils and heavier projectiles can help slow it down a bit. You get the same (or better) kinetic energy, but at a velocity that is easier to deal with given the higher time constant involved.
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filter caps for cg?
