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A LONG tube made of teflon (low friction), with two flat rails inside connected to the same source as the coil around the tube.
The armature is powered by contacting these rails, on its way out. It contains a small coil, aligned so that it is pushed away by the major coil of the barrel.
The armature is positioned inside the barrel, close to the middle. When powered both, the coil of the barrel and the coil of the armature, the armature will be accelerated towards the nearest end. The magnetic force will be applied on the armature even after it leaves the coil, degrading to zero soon after.
This way, there is no problem of timing correctly, as the force applied on the armature has the same direction always.
Registered Member #90
Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301
Good idea. This is the linear equivalent of a rotary dc electric motor. Some components such as spring-loaded carbon brushes might be directly adaptable. The powered armature coil will greatly increase field strength that interacts with the stator.
The tricky part is the fabrication and machining tolerances. If you have some skills this would be a truly interesting project!
Barry Why do they make cat food in those cute little shapes? Do cats really give a damn?
Registered Member #537
Joined: Sun Feb 18 2007, 07:22PM
Location:
Posts: 10
This has actually been done before (sort of). Look for what is known as a SPEAR coilgun. A coil of wire is pulsed to build a magnetic field, then disconnected from the electrical source. Before the magnetic field dissipates it is accelerated down a tube with external coils. The efficiency of the design that I saw was rather high something like 20% (I don't have my IEEE login right now so...).
I saw the SPEAR coilgun. However, besides the powered armatur, I suggest another concept:
Instead of attracting the armature, the external coil will REPEL the armature.
The armature will be placed in the middle of the external coil (and a little to the exit) and the magnetic fields will be thus aligned so as it will be pushed out. This way there is no suckback, and the armature is pushed away even AFTER it leaves the coil.
The maximum force is applied at the end of the coil, and all you have to do is to adjust the length of the coil and the timing of the LC circuit.
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Powered armature in a coilgun
