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Forum Index : Windmills : many blades to drive big generator
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| hazmat01 Newbie  Joined: 15/08/2009 Location: Posts: 3 |
If I built a windmill that had many long blades, it would turn pretty slow, but powerful. Now, if I attach that to a larger AC generator, I'm thinking I can send that directly into my (ummm... brain fart... that thingy before it goes to my home breaker box) Now, no one is talking about this and I'm sure there is a reason why, I just don't know it yet. Care to enlighten me?? Yes, I'm a noob at this, just getting into this. |
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MacGyver Guru  Joined: 12/05/2009 Location: United StatesPosts: 1329 |
The more blades you have facing the wind, the greater footprint you have. This does a couple of things. First, it makes it similar to having a sheet of plywood atop your tower, which can be daunting to control in heavy winds. IMO your best avenue would be to follow the lead of those who have 'successfully' gone before you on this same quest. There's a reason for the way everything is done. My suggestion would be to go to the library or google wind generators and read up on the several methods tried here-to-date before strapping on your work bags! 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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oztules Guru Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
If you wish to drive a induction generator into the grid, then 17-18 feet diameter blades are about a minimum size. The induction generator will require a gearbox to get the rpm up to where you need to direct connect into the grid. In the USA you need to get up to over-synchronous speed. For a 4 pole induction motor, that is about 1800 rpm+ The best place to start is at breezy 5.5's site here: The best number of blades is 3 ........oztules Village idiot...or... just another hack out of his depth |
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| hazmat01 Newbie Joined: 15/08/2009 Location: Posts: 3 |
My idea is a large scale project, big ass windmill that turns slowly but pumps out AC directly to my breaker box, well.... I probably regulate before, so my lights aren't dimming and stuff.... I will build some smaller scale mills to get a better understanding of the big picture. Now, the other thing I need to talk about what comes after the windmill. say I build a smaller one that puts out 24v ac, I first convert it to DC, then to a battery, and then through an inverter to make 120v to the house. Is that right? Ohh, oztules, what do you meean by "The best place to start is at breezy 5.5's site here:" Thanks for the response people, I can use all the help I can get. |
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| Robb Senior Member  Joined: 01/08/2007 Location: AustraliaPosts: 221 |
Its up ^^ there but easy to miss. Here is a copy |
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| hazmat01 Newbie Joined: 15/08/2009 Location: Posts: 3 |
looked at the breezy 5.5, i like it. I'm going to run some test first, see what wind speeds are around |
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