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Forum Index : Windmills : dc motor size

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need2know
Newbie

Joined: 16/06/2008
Location: United States
Posts: 5
Posted: 08:32pm 15 Jun 2008
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What is the best all around motor for generating about 12 volts with a minimum breeze. I am asking because I intend to use a dc motor as a generator. Will a 24 volt dc motor put out the necessary voltage at say half speed? Would I need a 1 horse motor or larger?
lottolearn
 
Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5116
Posted: 10:57pm 15 Jun 2008
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Hi need2know

I've done some work with the Oatley 24 volt DC motors, and didn't have much luck. Even in a strong breeze, I only got about 6volts.

You need to find a high voltage DC otor from a treadmill. These are rated at 120 or 240vDC and will work in a windmill application for 12v charging.

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

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127
Posted: 11:45pm 15 Jun 2008
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Hi need2know [lottolearn],

You have to find a DC motor/generator with a decent shaft diameter, unless you intend to mount the rotor blades on a lay shaft and couple to the generator.

Just a thought. Gordon.Edited by GWatPE 2008-06-17
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Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5116
Posted: 11:57pm 15 Jun 2008
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I did get an email from a guy in the UK recently who was going to try a 24v scoota motor on a large turbine with a chain drive to step up the speed. I asked him to let me know how it goes.
Using a chain drive will mean more maintenance, but those scoota motors are dirt cheap and if it works then it could be a cheap windmill.

Glenn
The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ
 
need2know
Newbie

Joined: 16/06/2008
Location: United States
Posts: 5
Posted: 06:35pm 16 Jun 2008
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Thanks GWatBP That is what I intended to do. I use about a 3 inch sprocket mounted on the motor and a 8 inch sprocket on the rotor shaft.
lottolearn
 
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