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Forum Index : Windmills : Increase amperage

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Mountlouisa
Newbie

Joined: 16/10/2007
Location: Australia
Posts: 2

Posted: 06:13am 16 Oct 2007

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I want to build my first wind generator and i have found a stepper motor from an old photocopier. Its rated output is 8.4vdc 0.8amp. I well aware that its not good to charge a 12vdc battery. But I intended to use it to charge a 6vdc flashlight battery and to run sercurity lights at nights. is the 0.8amp enough to regharge the battery.Where I am there is plenty of wind day and night.Edited by Mountlouisa 2007-10-17

Regards

Tom

Gill

Senior Member

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

Posted: 10:44am 16 Oct 2007

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G'day Tom,
Welcome aboard.
I think it unlikely to put out enough volts or amps to do either of those jobs. Then again 'a bird in the hand' What have you got to loose.
My first attempt at wind power generation was a little stepper like yours. The performance was dismal yet I had fun trying and learnt a bit in the process without busting the bank.

Give it a go and see what you get. It 'll set you up a bit better for when you try a F&P. Now that will do the job plus some.

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

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

Posted: 06:56pm 16 Oct 2007

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Hi Tom

I would not abandon your idea on the information you have given though it may not run the security lights for very long.

That motor is rated at about 6 watts which is what a lot of bicycle dynamos were rated at so you can get an idea of the amount of power available to you.

How many wires on the stepper motor?

cheers

John

Mountlouisa
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Joined: 16/10/2007
Location: Australia
Posts: 2

Posted: 11:07pm 17 Oct 2007

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Hi John

Thank for your reply, the stepper has 5 wires

Regards

Tom

KiwiJohn
Guru

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

Posted: 05:00am 18 Oct 2007

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If you stepper has five wires I believe it will have four coils, one wire for each and a common connection to all on one wire.

Having four coils gives a bit of flexibility on how it is connected, I would say make the wind generator then measure what voltage you get between the common wire and each of the othe four. You can identify the common wire by measuring the resistance between pairs of wires, the common wire will be the one with the same, low, resistance to each of the other wires.

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