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Forum Index : Windmills : My new blades
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| Xmaswiz Regular Member  Joined: 14/04/2011 Location: United StatesPosts: 69 |
what is your voltage output setup for? and really nice work! Have you considered selling the plans, and instructions as a DIY kit? Santa Maria, CA. Noel |
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| brucedownunder2 Guru  Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
Boy, what beautifull workmanship --I wouldn't care less if it never worked , I'd just frame it and hang it all on a wall --bloody great work , buddy. It will work , don't u worry .. It's postings like this that I for one look forward to .. Bruce Bushboy |
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| rinaldoparaipan Newbie  Joined: 18/03/2011 Location: RomaniaPosts: 21 |
Very interesting idea! If I will have requests, I can sell them as a DIY kit. Now I am developing two standard projects :50x25x12 magnets with 2.80m diameter blades and 60x30x15 with 3.60m blades. Waiting for clients! 
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Hi Dan If you like I can put together a web page where you can sell your blades, like I did for Anthony, Phill and John. Just work out a price, ask the members here for feedback, and send the details to me. It wont cost anything. If anyone has a product they would like to sell, I'm happy to put together a page free of charge like I've done for those members above. The deal is you must be a forum member, and you are selling the item from home, as a hobby, to earn a little extra cash. Its not for businesses, they would have to contribute to the site in other ways, like writting an article like Windy Nation and Watts2C have done. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi rinaldoparaipan A very nice and professional project I await the further development as I have been looking into using rectangular block magnets instead of round to get a better coil layout as you have developed with this unit. Keep up the good work. All the best Bob Foolin Around |
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| rinaldoparaipan Newbie Joined: 18/03/2011 Location: RomaniaPosts: 21 |
Hi Gizmo, Thank you for your collaboration. First of all, I have to test the blades even up to the breaking point. This must be done in order to have some technical characteristics. I don't know what will be the shipping costs. Now, I must add an extra 6m steel pipe to have a 12m tower. Any ideas for the lifting procedure? Keep in touch. Dan |
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| domwild Guru Joined: 16/12/2005 Location: AustraliaPosts: 873 |
Thanks for that. Very professional build. And your English is perfect, as she is spoke! 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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| rinaldoparaipan Newbie Joined: 18/03/2011 Location: RomaniaPosts: 21 |
It's up. 
Now I have a real wind generator!! 
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Nice  The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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fillm Guru Joined: 10/02/2007 Location: AustraliaPosts: 730 |
Definatly do have a real nice Wind Generator , Nice Tower & nice Vege Garden. Keep us posted with the performance! WELL DONE  PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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SpitsFire Newbie Joined: 09/10/2010 Location: ItalyPosts: 11 |
Congratulations, super professional work SpitsFire IPSA SCIENTIA POTESTAS EST (bacone) |
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JimBo911 Senior Member  Joined: 26/03/2009 Location: United StatesPosts: 262 |
Feels nice to have her up and flying. May the wind gods be with you! Jim |
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| rinaldoparaipan Newbie Joined: 18/03/2011 Location: RomaniaPosts: 21 |
Today I had a problem:in the conection box I put a small bridge rectifier consists in 6 diodes MBR360 in order to power up two 3W leds( with a constant current regulator) that showes me when the generator works.I dont know why, one of the diodes blows up and the generator was short-cutted,was very nice to see the movemement of the propeller-as a stepper !! That means another lift-down and lift up the tower, removing the diodes in a brutal mode, now all is OK! Escuse me for my English, but I have four beers in my stomac Keep in touch. |
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| Xmaswiz Regular Member Joined: 14/04/2011 Location: United StatesPosts: 69 |
rotten luck, hope it was just a defective diode, and no other secondary damge occured. Santa Maria, CA. Noel |
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| rinaldoparaipan Newbie Joined: 18/03/2011 Location: RomaniaPosts: 21 |
Hello everybody. After one year of using my turbine and a lot of tests I have a big dilema: Because in the area where the turbine is installed I do not have strong winds, I decided to switch the charging from 24V to 12V. I have 2V battery modules, so is not a problem.Thanks God i didn't buy yet any inverter. The problem is that at 12V the turbine is running at a lower speed than at 24V. At 5-6m/s wind speed, I have 10A charging current for 24V and only 6A at 12V(what a power waste!!) due to the braking effect of the generator. But 6m/s winds are so rarely!! I increased the angle of attack from 4 deg to 14 deg in order to reach more torque. I dont know what to do :to switch again the voltage at 24V and the blades angle at 4 deg(for more speed) = rarely charging but more amps? or to keep to 12V, 14 deg angle =frequently charging but also lost power at high winds(loses power in the generator)?. Or another ideas? I think that the 14 deg angle provides more torque(I have 9 coils with 88 turns each, may be too much for 12V and 2mm wire diameter) but also slows the turbine. What is your opinion? Thank you! |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Hi Dan You have a couple of options. Both will need a bit of experimentation, but in the end you should get good results. First up you could try a 24V set up using capacitors in a voltage doubler configuration. This will let you make better use of low wind conditions. Have a look at Gordons article at http://www.thebackshed.com/windmill/articles/GordonsCapMod.a sp. Gordons cap mod will give slightly more power in normal winds, but more importantly, provide power in the low wind conditions where you were making no power before. The other option is to use a 12V set up and add some series resistance to the line. This is a common modification to the axial flux alternators what have problems getting up to speed. By adding series resistance, the turbine has less load when it reaches cut speed, and therefore can push past this speed. Of course some power is lost as heat, but overall we gain power. You can use some power extension leads to experiment with, basically add lengths of wire into the circuit to add resistance. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
You dont say if the generator is wired in star or delta, delta would work better for 12 volts. As Glenn has said a cap doubler in 24 volt mode would be your best option, as this will permit a cutin speed of around half your present cutin speed and load the mill gently. You will likely not get huge power from the caps but will pickup several amps in lower wind speeds where you currently get nothing at all. After using a cap doubler you will ask yourself "why would you build a mill without one", so work so well when sized correctly. On Alliexpress you can find suppliers for caps at a low cost. Pete. Sometimes it just works |
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| rinaldoparaipan Newbie Joined: 18/03/2011 Location: RomaniaPosts: 21 |
Thank all for your suggestions. My stator is wired in star. For the beginning I'll use the first circuit (with the series capacitors). I will compare the results (I have a data-logger and a weather station) and after that I will try the voltage doubler. What capacitors do you recommend me? |
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| fillm Guru Joined: 10/02/2007 Location: AustraliaPosts: 730 |
From what I can see from the info you have said on the previous page you mill sounds like it is severly overloaded and the load is comming in to early and stalling the blades, from what I can remember you did an incrediable job on your blades but they were more of a high speed blade and not a low Rpm torque blade like a GOE222, I doubt increasing the aoa to 14deg would be benificial With the high speed blades I would think a AOA of more towards the 1deg to even 0 deg is where they run their optimim TSR . It also appeares from what you have said , it seems at 24V they are over loaded if approx 240W @ 5-6m/s is what the mill is getting with a 3.1m blade set. |
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| rinaldoparaipan Newbie Joined: 18/03/2011 Location: RomaniaPosts: 21 |
I am not an aerodynamics specialist but I think that 14 deg AOA is too much. I did this to reach more torque against stalling effect.It seems to be wrong. I will reduce again the angle to 4 deg or even to 0 and to compare the results for 12V (with and without series cap) and for 24V without any auxiliary capacitor. 48V and 0 deg AOA is also a good idea, who knows? |
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