I am working on a 12V battery charging genny:
Here's what I have done: (the effort was to sorta duplicate the Wood AX but not use plywood, go three phase, use a 5' diam prop - 3 blade)and use an aluminum base..once generator is working to where I like, then I shall work on the yaw bearing and furling set up.
I have built 2 stators: (mainly because I needed/wanted to get good at casting them and secondly to test total output- after the bridges)
Both Stators are wired star. The actual gap between surface of stator and magnet ring is less than 1/16" with the total air gap being 1/16" + 1/2" for the stator..if I understand "air gap" at all..??
1st one was simply 9 coils of AWG 18 @ 40 winds. @ ~150 rpm I managed to get 2.25 V dc spinning by hand.
2nd Stator was also 9 coils/ same wire 90 winds. @ ~150 rpm managed to get to almost 5 Vdc. I had to make adjustments to my coil winder in order to make the coils fit the same mold - make the centre smaller. (To hold the coils into place, I drilled very small holes in my mold and used small tie wraps to keep the coils placed in their best position..once crazy glued together, I cut the tie wraps at the back of the mold and filled the little holes with silicone sealant. That seems to work well.)
So at this rate and if I simply increase the # of windings to actually get 12V+ at 150 - 200 rpm (or am I dreaming of that low a cut-in..?), I am thinking that I would need around 135-160 turns of same size wire. On this size of mag rotor diam, those coils will be fun to make and place.
I would love to hear some Lay term info on this. And what I should try as far as # of turns. At this time I only have 18AWG as that was what was used for the Wood AX. So, should I consider going to a smaller AWG size 20/22..?? but larger amount of turns...or continue to try with larger # of turns and same wire size.??
As well, will pulling the mag ring back from the stator have any positive effect..?? easy enuff to try...just curious.
Secondly: I have read many times here persons referencing 12V 24 V 48 V Charging systems...what determines whether one gets 12 / 24 or 48Vdc.?? This is about as clear as fog to me..!!
I appreciate any commentary and suggestions on first part and explanation on second.
....and (Soopraz Soopraz ala Gover Pyle), I am actually starting to understand some of this stuff...!
Lot of Q's..
Rgds,
stk