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Forum Index : Windmills : Decogging
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| doogy Newbie  Joined: 30/07/2013 Location: AustraliaPosts: 4 |
Hello all, I am a newbie here just starting out with my recently acquired FP 42pole 60 series smart drive motor. Firstly let me say that this site and forum is an excellent resource for someone like myself with limited knowledge on the subject. It's a steep learning curve for me but very enjoyable. Keep up the good work everyone. My question is about decogging. I have read a lot about it here and on other sites and from what I can gather it is very effective as a means of reducing the magnetic attraction to the stator and allowing a lower startup windspeed. I am assuming there will also be a reduction in output at the same RPM. Resistance in the coils will obviously remain constant so it is either a voltage drop or current drop (or) both)?? Can anyone verify or quantify this for me so I will know what to expect from my motor before I decide which way to rewire it after decogging? |
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fillm Guru  Joined: 10/02/2007 Location: AustraliaPosts: 730 |
Hi Doogy, Welcome to the forum, by far the best decogging method is to twist the poles, this maybe a little difficult with limited resources as the best way is to have a tool machined to neatly fit the finger. The amount of power lost by decogging ( any Method ) is not worth worring about, and some just get to pedantic about it . Get some good blades like the GOE222 and you will probably not need to worry about decogging. PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
doogy, Welcome to the forum. On reading your post i had the same advice as Phill, then scrolled down to read Phill's comment. Basically in my view every little bit counts, but you can become too obsessed with trying to get it perfect first up that the project becomes overwhelming, and a simple design fault will result in bigger problems than decogging. To me decogging is an advancement to a working mill, not a out of the box requirement. Should you not know, Phill is the Aust agent for the GOE222 blades, and they are a powerful blade (almost too powerful, but the F&P can handle it) so his advice is very true, being a good blade design for the F&P is well worth it, and overcomes many past problems of poor startup torque with sh*tty blades. Power out is a direct relationship to power input extracted from the wind source, so crappy blades result in crappy output. Its well worth the cost of a good set of blades and the GOE222 is as good as you will get for a general manufactured blade you can purchase. The good old F&P is almost bullet proof, and will survive almost any storm if constructed correctly, although its output for wind conditions and cost of build is way behind the Chinese mills, like OEM that Phill is also the agent for. Its not that Phill is special, other than he has good products at a reasonable price, and it would be worth you making contact with him before you spend time and money of a horse that might never make a rating. Pete. Sometimes it just works |
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| doogy Newbie Joined: 30/07/2013 Location: AustraliaPosts: 4 |
Thanks for the advice Phil and Pete. Its not that I felt it was mandatory to decogg the motor, I was thinking more about a lower startup wind speed. I can't see the point in having the thing up there if it only starts up in a strong breeze when a smaller device could have been ticking away for hours or days. At this point in time I only have a small 12v battery bank with a solar system and was looking for another way to keep the batteries topped up when the sun is gone. Maybe I should think about a smaller mill setup using something else and put the FP aside until I need to charge a larger permanently installed system a bit further down the track. Plenty to ponder. Thanks again. Cheers. |
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| domwild Guru Joined: 16/12/2005 Location: AustraliaPosts: 873 |
Downwind hit the nail on the head. When I think of all the money I have spent so far as I did not have a workshop with welder, pedestal drill, huge pop rivet gun for SS rivets, etc. just so I can create something myself and be proud of it. Phil's improved Chinese mill looks tempting should I be unable due to time constraints to ever finish my mill. It is a hobby and money is not that much of a concern when it is a hobby. Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up. Winston Churchill |
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| doogy Newbie Joined: 30/07/2013 Location: AustraliaPosts: 4 |
Thanks Dom, I get your drift and I'm in similar circumstances, but I love to build things, overcoming problems along the way with creative ideas and research (some that work and some that don't), much much more enjoyment and satisfaction than buying something off the shelf. It will usually end up larger and heavier, less efficient and more costly but to me its well worth it. If all else fails then I will buy something, and yes I know you will say "I told you so!" But same as you, its a hobby and a challenge. Cheers, Doug |
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