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wind friend

Newbie

Joined: 01/05/2007
Location: Australia
Posts: 39

Posted: 07:01am 03 May 2007

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help

do i go for coils that give me 700mV open cct voltage and 4A short cct current or 2.3V and 800mA short cct current. all i want to do is charge some batteries to run an inverter. i have 24 of these coils and i gues they can be wired in 2, 3, 4,or 6 phase. for charging batteries do i want amps or volts?

hans

Gill

Senior Member

Joined: 11/11/2006
Location: Australia
Posts: 669

Posted: 11:43am 03 May 2007

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G'day wind friend,
Welcome to the group that uses the wind to charge batteries to run inverters. You don't specify what you intend doing with these coils. Can we asume you intend building an axial flux wind generator?

Certainly with 24 coils you could select several phase arrangments, though 3 phase is reccomended and prefered.
For charging batteries you must have amps and volts.
The volts must be higher than the battery voltage before the amps can flow through the battery and charge it. Typically for a 12 v battery the voltage can be say, 14 to 20 volts.
Once you satisfy this prerequisit it's usual to seek as many amps as your can extract from the wind.

The axial flux generator is an excellent wind generator, though it does require skills in several areas. Check the Links on this site as some cover in detail this type of generator.

was working fine... til the smoke got out.
Cheers Gill _Cairns, FNQ

KiwiJohn
Guru

Joined: 01/12/2005
Location: New Zealand
Posts: 691

Posted: 06:09pm 03 May 2007

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Hi Wind Fried

I would like to see a bit more information on this, I am thinking especially of the comment you make about phases as although it is true that 24 coils could be arranged in a variety of phases (I guess 24,12 and 1 in addition to those you listed) you would also have to take account of the number of magnetic poles.

John

wind friend

Newbie

Joined: 01/05/2007
Location: Australia
Posts: 39

Posted: 11:58am 04 May 2007

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gday gill

had loads of fun with a duel trace scope and had a good look at the wave form and wondered why the funny shape. each coil was wound to cover 15 deg of a disk which made it a narrowish coil. the magnets i am using are 30mm in diameter. soooooo what was happening was- as the magnet passed over the test coil the voltage created was cancelled out as the otherside of the coil passed under the same magnet. the plan is now to wind a coil that pases through the field of two magnetic poles(reversed of course) and see wot happens. a test coil wound over a plastic choke bottle and deformed a pit so each side of the coil cut a different pole and short circuited squirmed uncomfortably with the duel rotors only spinning slowly. oh the pain, but wot fun in learning. by now i could have bought a kit from jaycar and be flying. ta for your interest

hans

wind friend

Newbie

Joined: 01/05/2007
Location: Australia
Posts: 39

Posted: 12:08pm 04 May 2007

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hi john

a vertical learning step? has resulted in a radical reworking of the coils one option is now to rewind 36 coils so each side of the coil is cut by a different pole. i have 24 (unobtainium) rare earth magnets on 2 steel discs wot are 300mm in diameter. each of these magnets are 30 deg apart 360 / 12 =30 to give me three phases each with 12 coils in each. wot i dont know is wheather you count this as 12 poles or 6 poles.

thanks for you interest

hans

windlight
Guru

Joined: 03/03/2007
Location: Australia
Posts: 331

Posted: 02:44pm 09 May 2007

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Hans, perhaps you could review this site, Ed explains some aspects quite well,....
http://www.windstuffnow.com/main/

allam down under

"I like this place and willingly could waste my time in it" - (Act II, Scene IV).

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