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matthenley
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Joined: 21/01/2007
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Posts: 3

Posted: 03:28pm 20 Jan 2007

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Hi there!

I've spent a weekend building a small turbine out of an old DC motor and other bits and pieces. My problem is it only generates 2-5 vdc. I had a little gadget (info here) that brought this upto 14vdc, but this died when the whole thing fell off the garage roof.

Any ideas?

Matt Edited by matthenley 2007-01-23

Gill

Senior Member

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

Posted: 09:37am 21 Jan 2007

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Yeh matthenly, I have that "falling off the garage roof" problem too. People say it is the rum, but I think we should use stronger string.
Seriously though, thanks for the heads up on that gizmo but I see they sell wholesale only, Where would i be able to buy such a device from?Edited by Gill 2007-01-22

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

Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5149

Posted: 11:17am 21 Jan 2007

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I bought one of these little boosters from Oatley Electronics http://www.oatleyelectronics.com/kits/k091a.html. It worked down to 6 volts, any lower and it shut off.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

matthenley
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Joined: 21/01/2007
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Posts: 3

Posted: 06:13pm 21 Jan 2007

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Gill said they sell wholesale only, Where would i be able to buy such a device from?

That's my problem. Can't seem to find anything similar anywhere. How can I get my tiny voltage high enough to trickle charge a 12v battery?

Could I just use the coil thing from a transformer and put six times more turns on the output side than the input, resuting in an output of 12-30vdc and therefore keeping my battery topped up? I am trying to recall the stuff I learned at school here, which was way too long ago.

I've googled for a curcuit diagram for something, but a I'm a bit stuck for now...

MattEdited by matthenley 2007-01-23

KiwiJohn
Guru

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

Posted: 07:25pm 21 Jan 2007

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You could use a transformer but not with DC (well, not without more electronics).

I suggest consider saving the DC motor for something else while using something more suitable for this application. Maybe a stepper motor?

As a very rough indicator a DC motor must spin faster as a generator than it would as a motor on the same volts. If you can find a higher voltage DC motor it will produce a higher voltage on the same turbine.

matthenley
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Joined: 21/01/2007
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Posts: 3

Posted: 03:53pm 22 Jan 2007

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I found the gadget I originally used on a German site here .

Hope this is useful to someone. Thanks for your help and all the best with your projects.

Matt

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