Current projects: Click here to see my best coilgun, and my levitator schematic and my RLC Simulator.
What is a coilgun or gauss gun?
It accelerates a piece of iron or steel down a tube. The tube
runs through a series of electromagnetic coils (like solenoids).
There are no sparks or noise or impressive side effects (or parts
to wear out). Some careful timing circuits energize each coil
in sequence. The principle of magnetic attraction draws the
projectile along at rapidly increasing speed.
Why build a coilgun? It demonstrates many basic concepts of magnetic machines. A coilgun is foremost an example of a solenoid. These appear practically everywhere, from car door locks to doorbells, from diskette drive ejectors to fuel injectors. The only difference is that most solenoids limit the range of travel, and usually have a spring return. A coilgun is also an example of a simple linear motor.
A coilgun is scalable to very large applications, possibly as large as a mass driver to put payloads into orbit. It's a keen space-age toy. It has no moving parts -- there's the magic of invisible forces at work. It requires no special construction techniques or unusual tools. Winding coils is fun and relaxing (at least for the first few!). Even small coils are remarkably powerful.
You can also learn about magnetic levitation here. These pages include complete design details for several maglev demonstrators which levitate small iron parts. Read all about it and see levitation pictures.
2/7/2008 - Updated the Pulsed Linear Induction Motors with a new easier-to-navigate copy from Braam Daniels.
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by Barry Hansen. |
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