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Chuck, I would like to be following this along but I should have said earlier that my internet provider won't let me see your photos because it has decided to block acess to where ever you are hosting them. Jo
Chuck,do you intend the coils of the stator to be fake and have magnets inside? If not, a coil without (iron; better ferromagnetic) core is quite ineffective. For iron, µr is 300…10000, for ferrites, it is 4…15000. So that's the factor your field strength is reduced by not having a core.Nick
Hi Chuck If you don't mind me asking how did you arrive at the 60-70 turns? If I do the maths it equates to coil height of 5mm to 5.5mm - it looks a bit bigger than that, maybe1/4" which should give you about 95 turns (tight wound) N=0.707*H2/d2 N= Number of turnsd=diameter of wire #24 = 0.55mmH=Height of Coil(along the coil axis) Where H=5, N=60Where H=5.5 N=70Where H=6.35 N=95 of course there is a tidy factor. If I was winding them myself in a hurry you would have to half all those calculations Bez
I built a little alternator a few weeks ago, it was a little shaded pole motor, 850 rpm type. I took out the armature, and made a new one, it is a 6 finger claw (similar automotive alternator), with 3 ferrite magnets removed from old speakers inside, this will produce about 90V, and gives useful power when fed through a transformer, and a bridge rectifier, to give about 12V. This alternator was designed for the Stuart S9 .
Jo, I've been hosting my photos in a public folder of http://www.dropbox.com for some months now. These include the Fairbanks and the radial 3 compressed air. Are you not able to see pictures from any of my recent posts? Is anybody else having a problem seeing them?
Chuck, I wanted to remove the pole shading rings(they are just used for starting these motors), but I would have to remove the main windings, and I'm too lazy to do a rewind, although I could fit in heavier wire, which would be useful in increasing the current, it was a 150 watt motor. Ian S C
Hi Chuck I don't think you'll have much trouble making enough juice to drive a couple of Doz White LEDs at about 60mW each. I guess we'll get to see eventually but some of us are impatient mugs.. so I'll ask now What will you be using for your induction source? and how will they be configured? by that I mean; with the eight windings were you aiming to get 60Hz at 900rpm? There is just so many ways you could set this up. Oh! By the way... if these questions are gettig in the way of building this thing... just skip the answers & go streight to the workshop so you can get more progress photos. Bez
Not sure what you mean by induction source. The armature will have 16 bar magnets arranged with alternating N & S poles facing outward. The coils will all be hooked in series. This will allow all the south poles to pass the coils at once followed by all the north poles passing the coils at once.Chuck