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Forum Index : Windmills : Lets Twist again
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RevUpWind Regular Member  Joined: 03/05/2008 Location: AustraliaPosts: 60 |
I am having not much success in twisting poles on my F&P stators. Have successfully rewound a couple with 1.0 wire and have not worried too much about cogging. These stators are working well and with our dual stator setup it seems that just finding the right spot by staggering the rotors eliminates most of the cogging. My question is, is it worth doing? And if so what is the best way to do this? I have experimented on a couple of old stators with various tools and none have been very successful. Have tried with wire on and wire off. I have seen a tool in a post here somewhere which showed a tool machined to take shape of top of coil. Is this the correct and only way to do this. Thanks to all you guys for you help. Peter And note still cannot get post to spread across page. Did this in Word and should I just use notepad or? Uh, use Opera not Google Chrome and fixes problem 
....River Heads - Australia The wind blows wherever it wishes; you hear the sound it makes, but you do not know where it comes from or where it is going. |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5119 |
Have you seen this page... http://www.thebackshed.com/Windmill/articles/decoggingFP.asp Its got some details on the tool for twisting poles. Is it needed? I dont think so with the bigger turbines everyone is making these days. Are you still using Google Chrome? I did a test and had the same problem with Chrome, but IE and Firefox were ok, so I put it down to a Chrome bug. Glenn Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| Jarbar Senior Member  Joined: 03/02/2008 Location: AustraliaPosts: 225 |
Hello Peter, when I first started down the F&P path on a VAWT I nearly stopped development due to the noise from cogging being amplified 10 fold through the blade cups.The tool described on the pages Glenn suggested was my solution to being able to firmly hold the plastic molding around end of the poles.And apply even twisting pressure with the thin side fingers cut away to allow the greatest angle of twist without hitting adjacent poles.Once this was done the noise disappeared and the cogging feeling greatly reduced.Glenn made a similar tool by fabrication rather than machining.Some rectangular tube may also make a good fit. P.S this VAWT project is still unfinished. Anthony "Creativity is detirmined by the way you hold your tounge".My Father "Your generation will have to correct the problems made by mine".My Grandfather. |
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| RevUpWind Regular Member Joined: 03/05/2008 Location: AustraliaPosts: 60 |
Thanks for that link Glenn, I had looked at it many months back. And agree with you that the larger dual stators do not seem to be a worry so much once you find the sweet spot. And must remember to use Opera when posting here. Anthony I see that cutting away the excess plastic must be a help to getting it right and of course a more correct shape tool. Have you done this and grinding the corners on your dual stator with your new PVC blades? And also noticed and/or measured the difference. Look forward to getting new 1.5 extruded blades to get more torgue low down and more power in that area. Have tested these rewound rotors with caps and the result looks good. Peter ....River Heads - Australia The wind blows wherever it wishes; you hear the sound it makes, but you do not know where it comes from or where it is going. |
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oztules Guru  Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
"Have tested these rewound rotors with caps and the result looks good."........... Gordon will be pleased to see someone else with results to publish I suspect. ............oztules Village idiot...or... just another hack out of his depth |
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GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi oztules, The results of successful use of caps will help with the skeptics. I still intend using them on my future windmills. My new AxFx mill will have approx 1300uF caps in the voltage doubler. I sourced some 80VDC 680uF low ESR caps, and these should do fine. This should be OK on Phill's new mill as well. The cap sizing is still based on the power that is required to be transferred by them. Gordon. become more energy aware |
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