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Forum Index : Windmills : Magnetic decogging

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DaViD

Senior Member

Joined: 14/01/2009
Location: United States
Posts: 120
Posted: 01:07pm 20 Feb 2009
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Has anyone tried to use small magnets placed on the rotor hub between the cogging areas to reduce yhe cog?
And also does anyone know it this would have an adverse affect on performance?
If your not living on the edge your taking up to much space!
 
Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5119
Posted: 06:22am 21 Feb 2009
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I think for the work involved the gain would be minimal. Plus you may upset the flux paths through the coil/poles and get less output.

These days rounding, or better still twisting, the poles is easier and works with minimal effect on output power. I built a tool for twisting the poles and it really is a simple process.

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

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Joined: 14/01/2009
Location: United States
Posts: 120
Posted: 01:21pm 21 Feb 2009
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Thanks Glenn I was thinking it would work but really was unsure of the effect it would have on it.

Dave
If your not living on the edge your taking up to much space!
 
imsmooth

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Joined: 07/02/2008
Location: United States
Posts: 214
Posted: 02:13pm 21 Feb 2009
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See here for decogging using slanted magnets. Worked great.Edited by imsmooth 2009-02-23
 
DaViD

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Joined: 14/01/2009
Location: United States
Posts: 120
Posted: 03:07pm 21 Feb 2009
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Thanks imsmooth,
It makes sense to do that, its kinda like taking the potholes out of the highway
If your not living on the edge your taking up to much space!
 
DaViD

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Joined: 14/01/2009
Location: United States
Posts: 120
Posted: 06:31pm 21 Feb 2009
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Or should i say smoothing out the speed bumps
If your not living on the edge your taking up to much space!
 
imsmooth

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Joined: 07/02/2008
Location: United States
Posts: 214
Posted: 09:39pm 21 Feb 2009
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Go to my photo log here
and you can see what I did with the magnets and how they performed.

If you are interested in buying them I can have them made in China and mailed directly to you. They are about $2/magnet. Shipping is something like $75, but I am not sure. If you are serious in getting them I can get a quote.
 
DaViD

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Joined: 14/01/2009
Location: United States
Posts: 120
Posted: 06:07pm 22 Feb 2009
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Are the magnets designed for the F&P or can they be modified for other applications as I havent got my hands on a used F&P yet?
If your not living on the edge your taking up to much space!
 
imsmooth

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Joined: 07/02/2008
Location: United States
Posts: 214
Posted: 06:21pm 22 Feb 2009
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I designed them for the F&P rotor.
 
DaViD

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Joined: 14/01/2009
Location: United States
Posts: 120
Posted: 06:29pm 22 Feb 2009
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Ha! next question. do you have a F&P you can sell me?
If your not living on the edge your taking up to much space!
 
imsmooth

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Joined: 07/02/2008
Location: United States
Posts: 214
Posted: 07:58pm 22 Feb 2009
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I have an extra that I may use in the future. conact Randy at rburmeister@watchtv.net

He bought a number of them. He can sell you the shaft, rotor and stator as one unit. Let him know that Jonathan referred you to him. He is very helpful.

Jonathan
 
DaViD

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Joined: 14/01/2009
Location: United States
Posts: 120
Posted: 12:24am 23 Feb 2009
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Thanks Jonathan I'll give him a shout and see if he'll sell me one. I've been looking on ebay but with no luck.
If your not living on the edge your taking up to much space!
 
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