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Forum Index : Windmills : prospective generator

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curiosity
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Joined: 04/12/2011
Location: Australia
Posts: 31
Posted: 12:11pm 10 Apr 2012
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I have an aircraft generator very similar to http://us.ebid.net/for-sale/aircraft-d-c-generator-type-p-mf rs-43879429.htm and was wondering if it would make a decent wind generator?
 
Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5078
Posted: 01:15pm 10 Apr 2012
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Hi Curiosity

Nah, it would be pretty hopeless. It looks like a series wound generator, and reading the description, it supplies 28 volts at 5,000 to 10,000 RPM. Thats about 20 times to fast for a wind turbine.

It would, however, make a mean motor for a kids scoota!

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
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yahoo2

Guru

Joined: 05/04/2011
Location: Australia
Posts: 1166
Posted: 01:26pm 10 Apr 2012
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spec plate says output 200 amps and rev range 5000 to 10,000 rpm. they make good motor driven chargers for big 24 volt battery banks but need good support bearings and at least a 2 belt pulley.
I'm confused, no wait... maybe I'm not...
 
curiosity
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Joined: 04/12/2011
Location: Australia
Posts: 31
Posted: 01:56pm 10 Apr 2012
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  Gizmo said   Hi Curiosity

Nah, it would be pretty hopeless. It looks like a series wound generator, and reading the description, it supplies 28 volts at 5,000 to 10,000 RPM. Thats about 20 times to fast for a wind turbine.

It would, however, make a mean motor for a kids scoota!

Glenn



I realize a windmill would never spin that fast. I wouldn't be spinning it directly from the blade head. Possibly from a stepped gear or pulley set up to achieve the speed required
 
Tinker

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Joined: 07/11/2007
Location: Australia
Posts: 1904
Posted: 02:10pm 10 Apr 2012
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  curiosity said  

I realize a windmill would never spin that fast. I wouldn't be spinning it directly from the blade head. Possibly from a stepped gear or pulley set up to achieve the speed required


A 20:1 gearing ratio is a *very* big ask for that requirement. Personally, I would not bother with bigger than 6: 1 ratios which can just about be done with a single reduction.
Klaus
 
curiosity
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Joined: 04/12/2011
Location: Australia
Posts: 31
Posted: 12:32pm 12 Apr 2012
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Thanks guys. I thought maybe a vawt would do it but 6:1 is a far cry from 20:1
 
Rastus

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Joined: 29/10/2010
Location: Australia
Posts: 301
Posted: 12:08pm 14 Apr 2012
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Hi Glenn,
Using 5 of the Goe222 blades,can you provide a guestimated Rpm capped speed,using a diameter of your choice,please? I havn't checked,but I vaguelly remember seeing a 5 blade mill on an earlier thread someware and I'm hoping you can fill in some details.Cheers Rastus
see Rastus graduate advise generously
 
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