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Forum Index : Windmills : 12v car altenaters ????

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Mr.A.
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Joined: 26/09/2006
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Posts: 7

Posted: 07:34pm 25 Sep 2006

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Hi,

I'm new,I posted this question in the general chat befor I spotted this one.A long time ago I hooked a 12v car alternater to a lawn mower engien and quickly found out it wouldn't work. I wonder how large of a prop would it take to overcome the Emf of an alternater at speed using a belt or chain drive between it and a large pully or sproket on the prop itself.
     I also have an idea for a windmill that has only 2 moving parts,I need some one who has a better knowlage of physics than myself to confirm that the thing will work.
     I will appreceate any info,
                               �Thanks!
                                       Mr.A.Edited by Mr.A. 2006-09-27

Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5078

Posted: 09:10pm 25 Sep 2006

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This pops up from time to time.

Mat has done some work with 24v truck alternators, info here http://www.thebackshed.com/Windmill/Articles/MattLyons.asp.
As a rule car alternators are not used for windmills, try a google search for car alternator windmill.

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

Mr.A.
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Joined: 26/09/2006
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Posted: 03:23am 26 Sep 2006

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Thanks' Gizmo,

The other idea I have uses Lenz's Law.Basicly it's how those flash lights you shake work. Do you know if it is making a true alternating current? It seems that way to me,but I'm not sure.
Mr.A.

Gizmo

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Posts: 5078

Posted: 10:50am 27 Sep 2006

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Yeah they would make AC. Any magnet passing through/past a coil generates AC. As the magnet approaches the coil the current in the coil travels in once direction, and as the magnet leaves the coil the current travels in the other direction.

Glenn

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

Mr.A.
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Joined: 26/09/2006
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Posted: 02:09am 28 Sep 2006

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Thank you so much Gizmo!

It's time to start fabricating. I let you know how I make out.
Mr.A.

Trev

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Joined: 15/07/2006
Location: Australia
Posts: 640

Posted: 10:10am 30 Sep 2006

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Hi, Mr A, Thanks to Glenn, you may now see a pic of a geared car alternator 12v wind gen on this site under the Windmill Kits and parts section, on the Foundry & Fibreglass page. I no longer have this up, but still have the parts, marine grade stainless shaft and alloy bearing housing, brakets etc. If you are interested, I can give you a good deal on these parts. If you have wind speeds better than 5-6 miles per hour, then this works well.

Trev @ drivebynature.com

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