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Forum Index : Windmills : A BIGGER vawt
| Author | Message | ||||
| charlie_ruizpr Newbie  Joined: 08/07/2010 Location: Posts: 36 |
Well after I made this vawt and saw the results I said, it is time to go bigger so I started constructing the 48" tall by 32" diameter and finished it up a couple of minutes ago. So I decided that since the existing vawt does not spin fast enough that I should take it down and to my surprise there was a nut on the threaded rod that got loose and got jammed in between the metal base of the pole and it was stalling the damn thing, when I noticed this I got made and I just simply put it on the roof and it started spinng with ease. Small vawt And this is the bigger one which is waitng for the ball bearing and the 3/4" shaft pole. Bigger vawt |
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Downwind Guru  Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
You dont appear to have any alternators attached to these and a free spinning vawt will tell you nothing, as a piece of flat tin with a bend in it will spin, as they use them for road side signs. The important information is rpm and torque, which you need the alternator for. Pete. Sometimes it just works |
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| itsandbits1 Regular Member  Joined: 13/08/2010 Location: CanadaPosts: 81 |
these don't appear to meet the specs for a lenz blade. they apear too short and and need the length to add power. they are a drag in power mode and need counterrotating sets to get good alt rpm or real high wind. Plan for a heavy support as these are pretty heavy once built to spec |
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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
These are made from the lenz2 blade and they are the same size he used on his page windstuffnow, just by a picture you can not determine the size. |
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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
Well for an alternator I have two options one is axial flux with 22 gauge wire ( I kno it is to small) and the other is a 2 hp motor I got from work. |
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MacGyver Guru Joined: 12/05/2009 Location: United StatesPosts: 1329 |
Charlie In the world of VAWTs, "too small" may be an inappropriate conclusion to jump to just yet. If you could post a picture, that would help a lot. As for the 22-gauge wire, given the size of your rotors, that might be just what the doctor ordered. You'll have to spin the thing to determine it's voltage output and then you'll have to compare that to your battery voltage to see where your "cut-in voltage" lies. Cut in is the point at which the voltage produced by the alternator exceeds that of the battery (I assume you will be charging a battery) plus just a little bit more. For a 12-volt battery, I'd shoot for about 13.4 volts for cut-in. If your alternator produces lots more voltage, the battery voltage will "clamp" it and any excess voltage serves only to heat the stator. There are ways around this, but first things first. Do a little testing and take & post some pictures and you may be well on your way to a completed project before you realize it! EDIT: Okay; that was pretty weird. I hit "Post Reply" and got a "Spamming is not permitted!" message. I saved it as a screen shot, because I already had copied something with my mouse, and if it'll post, I'll do that, but last time I tried to post a screen shot I got another nasty gram saying it was the wrong file type. Only thing I can figure is that these chubby, jittery fingers hit the post button twice in a row quickly and the "system" interpreted it as spam. I dunno. . . . . . Mac 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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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
A picture of the vawt or the alternator |
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| MacGyver Guru Joined: 12/05/2009 Location: United StatesPosts: 1329 |
Charlie The alternator! You already sent along pictures of both VAWTs in your first post, I think; those are the same ones, right? Edit: Oh, I almost forgot to mention this: an axial-flux alternator has no resistance at start up and for a VAWT, that's the next best thing since sliced bread! . . . . . Mac 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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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
This is the 2hp three phase motor that I will probably use, I do not have a pic of the axial flux alt because I have not started it yet. 
VIDEO OF MY VAWT TURBINE |
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| itsandbits1 Regular Member Joined: 13/08/2010 Location: CanadaPosts: 81 |
hate to be the bearer of bad news charliee but the vawt will need to be 10-20 times what you have now to gear that moter up and drive it and the only way you will get that rpm out of a vawt is with lift or counter rotating. It will be a real showpiece when you are done |
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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
I will be making an axial flux for the vawt and use this motorfor a future hawt. |
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| itsandbits1 Regular Member Joined: 13/08/2010 Location: CanadaPosts: 81 |
good choice for this particular motor, but we had a bit of a conversation on another thread about this type of motor and I would like for you to take it on at some point but I may beat you to it. I am strongly considering putting a smaller motor on my Remkick wings to test the concept we talked about and was only giving you pointers on where you needed to go. Here's what I am going to test a smaller assynchronous motor on. remkick Wing |
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| charlie_ruizpr Newbie Joined: 08/07/2010 Location: Posts: 36 |
I had seen it already and liked the design. I was told that for me to use this motor as a generator that I would have to make a conversion, can anyone tell what is needed in this case to be done? |
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| itsandbits1 Regular Member Joined: 13/08/2010 Location: CanadaPosts: 81 |
you can use the motor as it is but have to turn it very fast; just faster than the rpm it has on the plate. Or you can do the conversion but it will not be very efficient unless you change both the windings and the rotor to make a pma and you still have to find the power to turn it which means a BIG unit. I would reccommend you try a ceiling fan because of the size of unit needed to push it and the good discription of other people that have done it. Or get one of those ficher paykel motors everyone uses and change that. I think everyone on this forum but me has done one or a dozen but me; can't find one, I have turned over at least a hundred washing machines looking. I don't think they use them in the america,s . |
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