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Forum Index : Windmills : Scaled up 10kw f&p?
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| cdog Newbie  Joined: 09/12/2010 Location: CanadaPosts: 4 |
Hello all, first post. I have been on the otherpower site for a few years and am currently running a 10' axial. I have dreams of a 10kw, reliable machine. I know this can be done with a 20' axial and a few midnite solar classic controllers. I recently read about the 7 phase f&p that has little or no cogging. Has anyone built a large homebrew f&p style machine capable of making serious power? Can anyone tell me even roughly how large, amount of neos and copper would be required to build a machine that would reliably make 10kw ? If it had to be overdriven to keep size reasonable that would be fine also. Thank you for your time, Cdog. |
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shawn Senior Member  Joined: 30/03/2010 Location: New ZealandPosts: 210 |
Hi cdod welcome!! I am running a dual f&p windmill and i do like it but they have downsides plastic for one and i have never herd of anything like the sort of power you are talking of they make a great first mill canot cook the stators no mater how hard you run em others here no better than i on 7 phase and max output but most that want serious power seam to head towards axial machines (i am building one)  |
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fillm Guru  Joined: 10/02/2007 Location: AustraliaPosts: 730 |
Yea , I built this Link Here a couple of years ago , it was only good for 1200W and unfortunatly or should I say thank mother nature hit the deck in a storm. This then motivated me to move towards Ax Fx , my advice is to stay with your Ax Fx and keep going with them for serious power. Neos are a waste of time with F&P , the amount of effort and cost is high for a small output and they cogg heavily requiring 5m/s+ to get them going, where Axials are already producing good power. This is it after it hit the deck See Here Although I feel if I would have had the Alu Blades on it to power it, then it may have been a bit more successful but still a waste of time, but its all been a learning curve that I wont be revisiting. PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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| cdog Newbie Joined: 09/12/2010 Location: CanadaPosts: 4 |
Thanks for the replies. I was not talking about ultra~modifying a washing machine motor, but perhaps something on the order of a three foot piece of pipe with large neos inside spinning around a homebuilt stator? On an axial were looking at roughly 140 cubic inches of magnet and 30 pounds of copper to get the job done. Is there any way to calculate the amount of raw materials needed, or dimensions? I know nothing about the efficiency of an f&p, but the non~overheating issue is very pleasing to me! If the cogging can be beat with the seven phase arrangement, surely this could be scaled up as well? Thanks again! |
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Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
Think you are over looking one main problem with a iron core machine...... you can not short them out to shut it down as the iron core will saturate and you will have a runaway. Controlling a large iron core machine could be a nightmare, as you would need a 10kw dump load to keep the mill loaded. It can be done but would think a well designed AXFX mill would be a far better option than going iron core. Pete. Sometimes it just works |
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| cdog Newbie Joined: 09/12/2010 Location: CanadaPosts: 4 |
I understand, I do want a 10kw dumpload, I also do not plan on a brake switch. I'm sure it can be made, I just need some direction on the basic operating fundementals of the design. |
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| Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
Obviously i can not speak for others but in my opinion there is no one on this forum that has the experience or the engineering knowledge to give you accurate enough information to be greatly helpful for what you are asking. The only person that might have been able to give you some direction is no longer with this forum, and possibly can be found over on Otherpower. A 10kw mill is a serious project and i would hate to see you go off with some half ass information and spend a lot of time and money building something that was designed on bad advice. I do not mean to imply others here give bad advice or do not know what they are talking about, but know of no one that has built such a project of this scale here. Pete. Sometimes it just works |
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| cdog Newbie Joined: 09/12/2010 Location: CanadaPosts: 4 |
I certainly appreciate your honesty! I'm sure one could buy a chinese pmg and be done with it, but what fun is that? No doubt it would not be the best use of mags compared to an axial, but I can't ignore the far better heat dissipation of coils that arent buried in epoxy insulation! I also like the fact that one could spin this type of machine at high speed and not worry about the mags landing a mile away! I will post on otherpower, they have answered all my ''stupid'' questions in the past, if I get any concrete data I will post back here just for curiosity and thanks. Thanks again to all, Cdog. |
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Greenbelt Guru Joined: 11/01/2009 Location: United StatesPosts: 566 |
cdog; This link is on this Forum about 6 months ago. Interesting commentary and pictures of a 10KW mill and tower. Time has proven that I am blind to the Obvious, some of the above may be True? |
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