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Forum Index : Windmills : 36 Pole Re-Wire

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Offgrid Thad

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Joined: 05/03/2009
Location: United States
Posts: 5

Posted: 12:50am 05 Mar 2009

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Hi All.
New here and I must say that I am about to explode from info overload.
I have just picked up several 36 pole F&P type motors for my new wind project that I am trying to set up.
I have seen most if not all of the info here relating to the 42 pole generators, and all sorts of info about adding caps to boost the output.
To get to the point.
Do the 36 pole gens benefit from the caps? Is a re wire neede or just add in the caps? And if so is there anyplace in any of these threads that can break it down simply? I made it to about page 20 or so on a long thread and came to the conclusion that I have no idea how to hook up the caps. There are multiple drawings and the verbage connected to them seemed to say several different things.
I do realize that this is a repeat question but the whole caps this is so spread out and confusing.
Thanks from the Yanks.

CraziestOzzy

Senior Member

Joined: 11/07/2008
Location: Australia
Posts: 135

Posted: 01:20am 06 Mar 2009

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Yeah, I made it to page 30 of that post several days ago, when I was looking into the use of a capacitor bank. The post was interesting reading and daunting for the uninitiated. Actually was a colourful rainbow of varying opinions.
I guess that on the AC side, I wouldn't mind seeing a real bad-ass inductor being fed by a cap or two before being rectified

I am more into using caps on the DC side after rectification to DC, trying to decide which setup to use to prevent the violent surge of current/voltage across a low resistance point

I only replied to this post to get it back up top of the page, in the hope the AC cap guys' fuses are not blown and might offer their experience

http://cr4.globalspec.com/member?u=25757

http://www.instructables.com/member/OzzyRoo/

GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 01:48pm 06 Mar 2009

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If you have read the cap threads, you will know that any Alternator used on a windmill will be able to be better matched to the load with capacitors, either in series connection, or voltage doubler/tripler/etc connections. How the capacitors are used, will be dependent on the loading profile. The most useful application is where the windmill has cutin at a relatively high rpm. Here the voltage doubler arrangement will improve the loading matching. Several examples have been given of successful systems on a variety of alternators. As more readers provide feedback on their systems, a better picture of what works will be made. I calculate how much power the caps will be required to transfer and use the rpm and alternator frequency, combined with the system voltage to get an approximate cap value. It is easier to add capacitance to find the best match. As soon as the caps are too large, alternator response to windspeed changes becomes slowed, and performance drops. Too low voltage rating and the individual power handling of the caps will be inadequate.

A thread devoted only to posting of individual test results may be needed so some correlations can be made.

Gordon.Edited by GWatPE 2009-03-07

become more energy aware

CraziestOzzy

Senior Member

Joined: 11/07/2008
Location: Australia
Posts: 135

Posted: 07:45pm 06 Mar 2009

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sounds like a much needed idea, regards the individual test results GWatPE...time permitting of course

http://cr4.globalspec.com/member?u=25757

http://www.instructables.com/member/OzzyRoo/

Offgrid Thad

Newbie

Joined: 05/03/2009
Location: United States
Posts: 5

Posted: 08:25pm 06 Mar 2009

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Thanks for the comeback.
The problem I am having is that I have yet to figure out the difference between the different hook ups. While I am not totally electronically ignorant I do come close. My specialty is steam, welding and machining with a strong background in alcohol research combined with its effects on lethargic passtimes.
Could somebody point me at the thread and portion that can explain the diff between doubling, tripling and whatnot?
Thanks again.

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