 My first multistage reluctance coilgun
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tomtechtod
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Sun Apr 19 2020, 01:11AM
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Registered Member #62572
Joined: Fri May 25 2018, 01:53AM
Location:
Posts: 5
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 Modular multistage coilgun
This coilgun consists of several modules, each module contains 14 stages.
My main goal was to increase efficiency by switching the coils off when the projectile (which is at least double the length of the coil) exists the coil.
Since the efficiency for accelerating ferromagnetic projectiles decreases the farther we saturate the projectile, my thought was that I need a lot of very small stages that accelerate over a longer barrel.
I only built 28 stages due to the high cost involved.
Each stage is a hard-switched asymmetrical full-bridge switching a constant current of 300A.
The efficiency is about 6.2 to 7.5% and I think it could go up to 15% at 5 to 6 modules. Higher efficiency allows for physically smaller capacitors.
The low voltage is good for safety but actually decreases overall efficiency I suppose.
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Barry
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Registered Member #90
Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301
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Great work, Tom! Nice video. Thanks for publishing all that.
I really like the way you put 14 stages together on a single PCB as a module. A whole bunch of SMD components together are a great way to reduce size. Are the optical sensors on the board, too?
Is your schematic and parts list posted somewhere?
Awesome, thanks, Barry
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