| Hi All (again),
In a previous posting, I was bouncing ideas for an alternative alt design.
http://www.fieldlines.com/story/2004/5/31/3145/27921
I tried out one idea, a radial alt with a non-ferrous rotor and no laminates :)
The rotor is about 40mm diameter, 4 mm thick perspex, there are 8 neo magnets 1/4"(w) x 1/2"(l) x 1/5" (h) with the magnetix axis thru h.
The magnets are arranged around the edge of the rotor, with the magnetic axis at a tangent to the rotor disc. Around the rotor alternative magnets oppose each other.
- 24 coils would fit around the rotor (8 coils x 3 phases)
- the test coil, 300 turns 32SWG.
The rotor magnetic flux lines seen thru magnetic viewing film.
This image gave me an idea for the coil size needed.
The coil and rotor.
Test rig shots.
Using one 32SWG coil of 300 turns, the gap magnet to coil around 2-3mm, results are;
Open AC 4.9v @ 3750 rpm
1.75v AC, 0.1A into an 18 ohm resistor. (0.175w AC) @ 2400 rpm
Open DC 7.5v (peak, around 8-9000 rpm)
Charging 3.6v 300mAh NiCad pack, 3.9v 0.01A @ approx 4000 rpm
And it even managed to produce enough power, briefly, to light my 12 LED array;
see; http://www.fieldlines.com/story/2004/6/4/8457/26205
I'm quite pleased with the results of these initial tests...
anyone any ideas if this is a good design?
paul |
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