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Forum Index : Windmills : windmill RPM
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herbnz Senior Member  Joined: 18/02/2007 Location: New ZealandPosts: 258 |
Hi All The blades on my windmill for the second time have come loose on the shaft and touched the tower. Being relectant to buy new blades (ex eco innovation) I have shorterned the blades. I would like to fit more efficient blades but as this mill has no furling I see my best obtion is to build a complet new mill. In the mean time I would like to get this unit up again . What I would like is a educated guess as to what I could expect in the way of its ideal RPPM so I can choose a stator winding. I have included pics the active area of the blades is now 410mm the dia overal 1.4 M . the blades have a standoff that is the differance. I have this time put a flange on the shaft so the comming loose of the friction drive that was supplied is eliminated. Also on the case of a neighbours mill does any one know of the Aeromag Lakota supllier in Australia the NZ agent is having problems supling parts. 
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| 9c12m Newbie  Joined: 04/09/2007 Location: AustraliaPosts: 28 |
Some Aeromag Lakota information at: http://www.goingsolar.com.au/pdf/catalogue/GS_15_wind.pdf Cheers |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5116 |
How much wind do you get there? Have you considered giving PVC blades a go. In all honesty, there really isn't a lot of difference in performace of comercial blades or home made pvc/timber blades. And if you have a lot of wind, you can get away with very simple blades and still make good power. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| herbnz Senior Member Joined: 18/02/2007 Location: New ZealandPosts: 258 |
Hi Glen We are in a high wind area very gusty and as the hills are very high and steep all my less than ideal sites get channeled wind sure at times comming down 45 degrees. The neighbour with the Aeromag has actually gone though 6 different mills Bergly and other brands. Must get him to cataloge history one day. The present unit has no furling so I see that PVC blades would destroy themselves. I have looked at modifying this unit but see better start scratch when time permits. Your site is giving me great ideas on the design I will use. would it be a idea to borrow a Aeromag blade and cast a mold ? ( if neighbour willing ) The present unit wiill and has been great to gather info and familiarise myself into the world wind power. It was fitted with a 80sp stator this is equivalent 16 turns/coil I have today started on stator 12 turns/coil assuming a faster mill. Also I have have managed to twist one pole so will try that for anti cogging. May even try the unbalenced three phase idea This unit is only any use for experomentation. Many thanks for response Also 9c12m thanks for info Herb |
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Trev Guru  Joined: 15/07/2006 Location: AustraliaPosts: 676 |
Herbnz, What parts for the Lakota are you looking for?? I should be able to source them for you. Those Eco-in blades sure will need some wind now. Way too small for my wind conditions. I would be interested to know why your neighbor has gone through so many windmills. Trev @ drivebynature.com |
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| herbnz Senior Member Joined: 18/02/2007 Location: New ZealandPosts: 258 |
Hi Trev Yea the neighbour says our conditions extreme. All the mills not cheap ones either. I have not until he bought the Aeromag stator around been involved. In my way thinking there is a common denominator. I have not had a close look at his tower but it is 50mm pipe with guys, I feel its possible it could have a resonant problem and start shaking. I will try to get him to come on here and give history. You can see its not straight forward in the commercial world either. The stator from the Aeromag needs rewinding or new one. In this case it was damaged by faulty assembly when he replaced the bearings that apparently were unsealed. So we need a price on a new stator to compare with rewind. Eco mill will properly be decoration until I can build new unit. Can you arrange export your blades etc NZ. Am I correct that your style of blades would require decent furling. By way the Aeromag is vertical furling he has had problens springs but when working is good Herb |
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| Trev Guru Joined: 15/07/2006 Location: AustraliaPosts: 676 |
Herbnz, My understanding is that these Lakota machines are wired for different voltage 12,24,48v at the factory. What voltage is your neighbor using?? I will attempt to find a price for you on Monday for a new stator. Yes I can freight to NZ. Trev @ drivebynature.com |
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| herbnz Senior Member Joined: 18/02/2007 Location: New ZealandPosts: 258 |
The voltage is 24 v looking at the manual there are a few models if you could get approx price be great. But dont go to much trouble I suspect rewind will be answer. Herb |
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