| T O P I C R E V I E W |
| gotwind |
Posted - 27/12/2007 : 22:41:54
I have a few free days, I am attempting a vertical axis wind generator - notoriously difficult to do well..
I should get a couple of amps @ 12v in good wind, using the 'coggless' axial flux alternator - 25 watts tops I suspect.
http://www.gotwind.org/Axial_Flux_Alternator.htm
May be a better option in my turbulent wind urban location, we will see.
Ben. |
| 6 L A T E S T R E P L I E S (Newest First) |
| gotwind |
Posted - 28/12/2007 : 18:36:59
I wouldn't be too disheartened Peter,
With any wind generator it is important to match the propeller to the generator.
In my case I was governed by a too higher speed alternator design and I didn't want to use gears/pulleys to increase the rpm using a vawt design.
That eBay traeadmill motor looks pretty good, coupled to a fairly large vawt design could work, I suspect you would only need to gear it about 3:1
Still better to make a horizontal design from that motor, it would be far more efficient.
Ben. |
| Peter Williams |
Posted - 28/12/2007 : 17:51:24
Thats a shame I would have been watching your input with great interest.
So what is the answer for a vawt?
I've just started mine based on the "lenz turbine" and was hoping to pick up a motor off e-bay.
I'm too inexperienced to build my own alternator and was looking for a treadmill motor similar to this
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=7240321908&ssPageName=MERC_VIC_RSCC_Pr12_PcY_BIN_Stores_IT&refitem=220182573621&itemcount=12&refwidgetloc=closed_view_item&usedrule1=StoreCatToStoreCat&refwidgettype=cross_promot_widget
and have to gear it up 3 to 1
Am I wasting my time then??
All help gratefully accepted.
Peter |
| gotwind |
Posted - 28/12/2007 : 15:13:29
Had a rethink, as Fungus pointed out, the 450 rpm is way too fast for a vawt.
It has now become a hawt using the old soil pipe prop design from ages ago, plenty of speed with this size - 31" diameter.
http://www.gotwind.org/Soil_Prop.htm
First tests were very promising holding by hand (not advised) because the axial design doesn't suffer from any cogging.
Ben. |
| gotwind |
Posted - 28/12/2007 : 13:26:28
Yes, true.
May be o.k for 6 volt - bit of an experiment really while the weather is mild and I am able to tinker...
Surprisingly windy here today also. |
| fungus |
Posted - 28/12/2007 : 12:28:08
Peter's alternator is nice but as you said it was designed for a cutin of 450rpm, so unless you're charging NiCds or have a form of boost converter then it wont match well with a vawt. |
| frankineto |
Posted - 28/12/2007 : 12:27:38
Hi
good luck with the build and no , not so easy to build .
some guy over in Australia , has recently been commsioned in I think new south wales to build one like this and it was horizontal rather than vertical and he has got alot of publicity , but i can't remember his name . I am sure the local botough might want some ideas hint hint
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