| Playing around with different configurations for a small alternator for a stirling project and this is what came to mind... a very simply single magnet 3 phase alternator. Below shows the parts made and ready to assemble...
Two magnet end plates drilled for 1/4" shaft cut from a couple of bolts and JB welded to the magnet. Below shows the basic structure assembled...
Wound 3 coils with 175 turns of #28 wire and installed them on the triangle end pieces...
A hand shot of the completed alternator with its base on it, sort of gives you an idea of its size... 3.4 inches long and just under 2 inches wide... The coils are simply taped to each other to hold them in place...
Its wired in star and a simple turn of the shaft produces enough electrical energy to lite 5 Led's. An open voltage spin showed around 5 volts, and a quick spin ran it up to 10 volts. Connecting it up to a 3 phase doubler it does 18 volts at 120ma. Should do a nice job with the stirling. I might put a small prop on it to see what it will do in the wind as well.
I have another one I'm working out some details that will also use a single magnet and have almost completed a 4 pole 3 phase with a slightly odd coil installation. Unlike my twisted coil alternator kit this one will use "bent" coils that will go all the way around the unit, both sides of the magnets. Strange little beast... another stirling project.
This one works well enough and is very simple to construct. I thought I would share with those interested in making some simple turbines. You simply have to make the sides of the triangles slightly larger than the magnet width. I used some 3/8" plastic for the triangles, 3/16" wooden dowel pins for the structure. Plywood ends would work fine as long as its sanded so it didn't catch the wire. No need for bearings, it runs smooth as silk in the plastic.
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