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Forum Index : Windmills : help me find used 10kw pma motors please
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BobMann Senior Member  Joined: 30/06/2011 Location: United StatesPosts: 134 |
Hello I Think for what he needs is a small controlled wind farm of VAWT. I think this will show what a good and safe VAWT looks like at at the 60 to 80 MPH wind speed working. Here is one of mine in a hurracain. http://www.youtube.com/user/CNGBOB?feature=mhee#p/u/9/YsaSpU 8fqUc Bob Mann |
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| Warpspeed Guru  Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Where can you get a 10 KW PMA ? I doubt if such a beast even exists. The way to do this is not with a PMA at that power level, it is just not practical. The way to do it is with a standard off the shelf self excited three phase alternator, as found on any standby power generator. 
You then couple that to a three phase transformer to step the voltage up or down to your proposed dc system voltage via a three phase rectifier. It is not difficult to turn rotary power into electrical power at any required voltage or power level. Ten Kw is not really all that much. The REALLY difficult part will be the wind turbine and gearbox to drive that sucker to full operating speed and rated power output. And that is an entirely different, and much larger problem than the answer to the question you asked in your first post. Cheers, Tony. |
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Oscar4u Regular Member  Joined: 23/02/2011 Location: New ZealandPosts: 42 |
Hello Warspeed This would be extremely power inefficient, but if one generated compressed air and used that to turn the gennie. One would need a cube M of air??????? Not an unovercomable problem. An air motor would seem a more difficult problem. I have an airstarter motor on my tractor but am fairly sure they are not designed to a high duty cycle. The advantage is that compressed air is very easy to regulate. Should there be lots of wind, it is very easy for a releif valve to open instead of the magic smoke escaping from an alternator that is too small. The compressor would need to be on the tower but the generator could be in the back of a shed and close to power. If the tank was close to the gennie maybe transmition losses would be smaller? Probably a debatabel point. I suspect the losses between blades and generator will be more then half. awaiting your comments. Thanks Oscar Oscar4u - for all your rotary cowshed repairs |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
You can build a gearbox to be pretty much as efficient as you want it to be, provided size weight and cost are no object. It is only if you want it small and cheap, that you end up getting a hot running unreliable gearbox. The big commercial wind turbines all have speed increasing gearboxes for their slowly turning blades, and the gearboxes are massive, but it is certainly possible. Cheers, Tony. |
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