Homebrewed Electricity > Wind

48v wind gen project

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PRedATor:
I have decided to build a PM wind gen after reading and studying lots of different projects here.  Not many are 48 volts.  But from some pages there have been some guides of windings and coil sizes.

We are on a 48 volt solar with back up generator system and have lived here since february this year.

Our batteries are 535amp/hr 8 x 6v banks with a 2Kw inverter and 4Kw diesel generator, all automatic, all I have to do is check the batteries for distilled water and make sure the fuel is in the generator and have it serviced regulary.
I have started to collect all neccessary bits for construction.

Now this is what I have in mind and if any of you want to jump in and suggest alternative things by all means do so.

The magnets I have are 24 rare earth 36 x 50.8 x 12.6mm blocks to go on 2 rotor brake disks off a volvo 250 which are about 10.5" in diameter, I am thinking of having 12' diameter blades which are in lengths ready to be carved.
The magnet wire I have is 1.06mm enamelled coppar wire which in AWG is between 17 & 18 AWG.

I was going to try 140 windings of this for my stator (9 coils) wired in star configuration. What do all you guru's think of this for a start?
Thats about it for a start.
Thanks

DanB:
I think it all sounds quite reasonable... except maybe the 12' prop part.  Your rotors are a bit small, and considering the size of the magnets and the wire my thought is perhaps 8 - 10 feet, and 10 feet would probably be pushing the limits.

Flux:
I agree that the rotors are small for those magnets if the stated size is right.


" would suit them much better.
turns seems high. With the small rotors you may only be able to use that size wire.  With the 14 or 15" rotors I think you could run that wire in 2 parallel.


With small rotors I agree with Dan that no more than 10ft. I have a feeling that with the large rotors you could manage the 12ft.
Can you confirm the magnet size, it seems a bit odd.
Flux

PRedATor:
50.8 x 36 x 12.7 is the exact measurments of the magnets from the data sheet.

I haven't put them around the rotor as of yet to see if they all fit nicely as I only just acquired them from the wreckers and dismantled it.  I may have to source some 14" ones to go on the same hub then like you two suggest. (thanks)

I would like to have the blades as big as I can have and the lengths of oregon I got cut and planed to 6' x 150" x 50".
I'll ask about the parallel wiring when I'm up to that stage. :))
I can get a different size wire roll from where I got this one as its on loan and I'll only pay for what I use from it.
cheers
richard

scoraigwind:
14 inch rotor disks would be ideal.  12 foot diameter blade rotor is no problem.
I would use about 100 turns per coil in star/series connection.  This would use about 4kg of wire.  You would have to use two of your wires in hand (from 2 reels) and connect them in parallel to fill the space.
I am assuming that the magnets are high grade neo ones.
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