bryan1

Hiya Willi,
Here's the link to Hugh's website http://www.scoraigwind.com/
and on the site there's a heap of infomation on wind gennies and he used to have a pdf link to his book but I can't find it there. Anyway I do have the pdf on my puter so if you want it pm me your e-mail addy and I'll send it over to you.

Cheers Bryan

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williB

i made a couple of the one inch coils ,that i was talking abuot before..
They produce 2V each which doesnt sound like much untill you figure that there are five per phase which is ten Volts and the Line to line voltage is square root of three times ten equals 17V all calculated.. i think thats right ? and given the lack of wire used , it should be a very light and powerful generator , with incredably low internal resistance..

williB

http://media.putfile.com/Video-72420
This is a video of my generator .



hosted by www.putfile.com

williB

below is a six coil 3 phase gen.
it should have 8 magnets , but i wanted to see if i could make one with the coils seperated . It worked out nicely..

Attached Images

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Klaus

I'm sure it works but I also dare say it would work even better with 12 coils. If you ever have taken a commercial generator (alternator, really) apart you see that they cram the coils as close together as possible. You want these magnets to work continuously on their circular travel route.

Btw, the video has sound but only a black pic on Windows media player, which is all this work computer has.

Keep those experiments going, I enjoy reading about them 8)

Klaus

williB

Like this ,
this is my latest one. Just need to make 2 more
the coils are are 1'' dia. , except for the one on the far right.. lol

about the video .. hmmm .. dont know ??

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williB

this is a 9 coil 12 magnet gen. superimposed on a 9 coil 24 magnet gen..
what i am trying to do here is have two generators on one rotoor
one thing i noticed is that for the same rotation the 9-24 will go through twice as many cycles ..
or put another way , for every 15 degree rotation the outer gen. compleats one half cycle , while the inner gen only goes through 0ne quarter cycle..
also a consequence of using twice the minium number of magnets is the phase changes from A-B-C to A-C-B not a big deal but thought i'd mention it..
so the outer circle is 8 '' dia. , (which is what i have to work with..) the coils are 1'' dia. & magnets are .5''.. the problem is my hub is larger than 1.948 '' which is the inner dia of the 9 coil 12 magnet setup ..

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williB

I suppose for that reason( doubling freq.) it wouldnt work , now that i think of it..

williB

Ok got the last two done..
Ya know , this will just fit in the size of a 3 1/4 '' hard drive case ..we'll see.. :lol:
now the question arises ( if i decide to put it in the 3 1/4 '' ), how am i gonna apply power to it? A while back i got this cranking flash light with a bunch of gears in it..possibilities..

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picture_088.jpg (87.8 KB, 910 views)

williB

in the first pic is the coil layout ready to be soldered , thats next ..
i just finished the magnets..
Looks like stone-henge doesnt it ?
http://www.emachineshop.com/download/index.htm
this would not be possible without emachineshop program , its fantastic..

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Klaus

Willi, looking at the pics of your ciols I thought you might be interested in a trick I found to get real slim coils.
As you know the air gap is the real killer in power output with these PM alternators. A smaller air gap results in a many times stronger magnetic field for the coils to pass through. You can get around this to some extend by using stronger magnets but these are bigger, making the whole assembly bigger too. Going the other way, by using very slim coils for a minimum air gap, you can increase the magnetic field of magnets of the size you used.

What is needed is a slim coil assembly with a wire gauge/ max turn compromise. With conventional coils you immediately have the problem of routing one wire from the inside diameter to the outside, adding a one wire thickness to the coil which contributes nothing to the coil output and widenes the air gap.

What I have used are two slice pancake coils. These have less turns (only two slices) than the conventional coils like yours but the adventage of having BOTH wires finish at the outside of the coil.
How is it done? You make a former exactly two wire sizes wide. You figure out how many turns you can get in one 'slice' and calculate the mean wire length. You double this for the second 'slice' and add for the pigtails.
Cut a piece of wire of this length and find the middle of it. Start winding the two 'slices from the wire middle at the bottom of the former. You keep wrapping the wire ends in opposite directions around the former core, creating two 'slices' of coil as you go, with each 'slice' having the wire in a single vertical layer. You end up with both wires at the top and a VERY slim coil.
I used 5 min epoxy to lock the ends in place before removing the coil from the former. Handle the finished coils carefully when interconnecting and placing them on a layer of fibreglass cloth before casting the coil assembly.

I used a six coil assembly, over which another assembly was glassed at a 30 degree offset. This gave me an epoxy cast & glassed 12 coil assembly only 1/4" thick!
The 6 coils had 16 turns each and were all connected in series for a total of 96 turns per coil layer, giving 4 wire pigtails per complete asembly.

I guess there are many combinations of coil interconnection, most people use 3 phase technology, I'm aiming for 4 phase with two coil disk assemblies and triple rotors. This will use 4 bridge rectifiers to get DC output.

Klaus

williB

I know , its proportional to 1/r^2 or something like that.. 8)
ya i'm allready thinking my 17 gage wire is too thick. but the appeal of lower resistance , is overwelming. :lol:
as pic 3 shows an 18 coil -24 magnet genny with six coils per phase ..
today i used six of my 9 coils to test out one phase ..
as it is i'm getting 0.5 ohms per phase! no voltage or current readings yet. as i have to adjust the air gap and afix the coils to the genny a little better..plus now i need nine more.. ug!..:lol:
That is a great idea , about taking half the wire and winding two layers , i wonder if it will work with coils of more than two layers ( mine are about 10 layers thick and six or seven layers wide ) ? which is really about only 15 feet total length..

Pic 1 is the placement layout centered on the board , i've since changed the layout to 18 coils which was as easy as adding a coil between each coil shown.
Pic 2 , is the hub from a 5 1/4 '' HD which has been my main bearing since i've been on this project.. :lol:

ps i really hate this LIFO approach to attachments..

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williB

well i've been underestimating the speed of the excercise bicycle/ generator , while cranking the new pedal arrangment by hand i have some new numbers..
let me run them by yall..
on the scope is one complete cycle , with it set at 1mS/div,the wave takes up 7 divisions..0.007s/cycle..
1/.007 = approx 142 cycles / sec.
with 24 magnets i'm getting 12 cycles / rev.. not 24..
142/12 = 11.9 rev/sec
multiply by 60 sec/min gives 714 RPM !!
i've got some numbers for one phase of the genny , i've cut the gap in half , at least, but still could be better, and i've got 7 of the 12 remaining coils done 18 total , but havnt put them in yet ..
i am getting 18 V peak to peak and ran some numbers on the expected output ..

' Y ' connected 3 phase line to line Volltage = (Vp/sqrt(2))*sqrt3..
Vp / sqrt(2) = Vrms
Vrms * sqrt(3) = line to line V.. i think??
anyway it comes to 11.02V calculated , no load .. a little dissapointing to say the least..

Nigel Goodwin

Have you tried comparing a ready made dynamo or alternator?, or even a simple DC motor used as a dynamo?. All the results you've posted so far look pretty poor, why not use a ready made generator?.

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williB

no i havnt tried a dc motor/generator ..
i'm gonna keep plugging away , i wouldnt say all the results so far are poor..
with the single phase generator i was getting a lot more voltage but the coils were bigger .
i've ordered some 20 gage wire ( .032 '' ) which should give better results for a three phase genny..