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Forum Index : Windmills : My Newest WindMill
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| windman1000 Regular Member  Joined: 21/06/2009 Location: United StatesPosts: 91 |
I know everything here is a no no but i had to try it, (16 8in pvc pipe blades 6.3 ft) ,3:1 gearing. 
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5119 |
Holy cow! Thats just radical. The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| windman1000 Regular Member Joined: 21/06/2009 Location: United StatesPosts: 91 |
 After I get the RPM Fixed then il do some data load checks and maybe go 4:1, This work out a lot better than i thought, and at 8-9 mph wind it charges at 2 amps. |
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KarlJ Guru  Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
what a beast! Nice work nonethe less Karl Luck favours the well prepared |
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gpalterpower Senior Member  Joined: 19/07/2009 Location: AustraliaPosts: 175 |
that is bewdiful! total work of art. love the cog belt setup. Marcus if it aint broke dont fix it!! |
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AMACK Senior Member Joined: 31/05/2009 Location: AustraliaPosts: 184 |
Nice job, it's out there.. What is the motor from?  *Note to self 1. Make it thick 2.Make it heavy. 3.Make it stronger than it should be. 4. Don't rush the first job as the second job will cost more and take mor |
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GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi Windman, All those blades?? Looks like my piclog viewer is right at home. Seems like the battery is not able to cope well with the maximum power. You will need overvoltage protection for equipment that is connected to it. Gordon. become more energy aware |
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| windman1000 Regular Member Joined: 21/06/2009 Location: United StatesPosts: 91 |
AMACK this motor is a Mavilor dc servo 4.3kw GWatPE (All those blades??) I built this for low wind, yes the piclog shows 27 mph wind speed but we only get that kinda wind maybe 3 times a year, most of the time 5-10 mph wind and 15 mph wind is max , all my generator setups before this i might charge at a low amp/voltage 4-6 times a year.(NOT GOOD) I started with 3 blades then 4 blades then 6 blades then 8 then 12 then 16 all derect drive and the 16 blade out performed all other blade setups in low wind. Thats when i decided to build a 6.3 ft 16 blade and 3:1 gearing for low wind, I really thought if this worked that the blade would stop or slow way down at 10 amp generator load, by watching the rotation i never see it changing with load ( I need My RPM Encoder Working )to really see what is going on. It starts up at 3 mph and starts charging at 2 amps at 8-9 mph wind , This is the best resolts so far out of many generators. |
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MacGyver Guru Joined: 12/05/2009 Location: United StatesPosts: 1329 |
Outstanding! You will find that the air spilling off each blade slightly compresses between itself and the next in line. This serves as a built-in over-speed mechanism. The "Aeromotor" windmills of the old West (USA) that pumped water were of a similar design. The only thing you'll have to keep an eye on is your tower in that you have a very large wind 'footprint' up there in the breeze. In very high winds, you'll want to furl the thing and I'm assuming the tail is hinged for that purpose. As for power; the sky's the limit with this design. The Aeromotors pulled water from 150 feet on a daily basis, some for nearly 100 years! Good work. Nothing difficult is ever easy! Perhaps better stated in the words of Morgan Freeman, "Where there is no struggle, there is no progress!" Copeville, Texas |
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| GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
This motor/generator has an axial flux ironless design. Good for a windmill. These are low inertia rotors, perfect for the original servo motor application, and will assist the low wind performance. Hopefully the brushes are replaceable. The commutator may give trouble over time with the high amps. A good furling system will take care of this problem though. Going for a 4:1 gearing will give slightly more low winds power, but this will impact on the higher power levels as well. I doubt the additional loading would stall all those blades. The fact that you have been able to increase the blade number to 16 indicates that these blades have quite a bit of drag. The gearing has allowed the generator to work better. I see this generator producing more power with a set of 3, more aerodynamic blades, without any gearing. Did external constraints direct your testing towards the eventual outcome of a low rotor speed and gearing? Was there likely to be a complaint if the rotor speed was higher? Gordon. become more energy aware |
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| JimBo911 Senior Member Joined: 26/03/2009 Location: United StatesPosts: 262 |
Very nice work there windman. It's windmills like this that keep things interesting. Jim |
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| philb Regular Member Joined: 05/07/2008 Location: United StatesPosts: 96 |
Nice work Windman! That's the largest servo I've seen flying. philb |
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