Generally, hard disc drive magnets are too small to be of much use except in tiny science-fair type wind turbines. Old, giant computer tape drives (the kind...
This was a very busy weekend for the Green-Trust and Woodhenge teams, as The Science / Discovery Channel film team arrived to do a photo shoot on Wind Turbine...
How does someone figure the number of turns of wire in a coil to get a specific voltage, i plan on using 14 guage wire the target voltage is 8 volts per coil....
I have looked on the Science Discovery channel on Sky but don't see mention of the Green Science series, do you know if it is shown on Sky in the UK? ... -- ...
35 turns (per coil) is 12v per set of 3 coils, 70 turns is 24v, 140 turns is 48 volts. the thickness of the wire determines the amps it can handle before it...
RPM does affect voltage. Which is why with 5 foot blades we are shooting for 650 rpm at 25 mph or so. it will spin at the correct rpm even at lower wind...
Steve, What's the approx centerline diameter of the magnets and coils for an alt like that? Lee ... From: Steve Spence To: axialflux@yahoogroups.com Sent:...
Steve, My most usable wind speed is 11 to about 15 MPH and I intend to use a 24 Volt battery also. What would 7' blades do to the RPM in this wind speed range....
I don't believe the series has started yet. The hosts are still on the road filming. maybe the series starts in November? I'll keep everyone posted. Steve...
longer blades means more output. should startup sooner as well. you can go thicker on the mold. You will have to experiment with the wire sizes. Steve Spence ...
I have seen coils that people have wound that have all different shapes. Some round, some oval and some pie shaped. This may be a dumb question, but does the...
... I am under the impression that the space inside the coil is the size of the magnet so that one side has passed the magnet before the other side crosses the...
How would one go about design an axial flux alternator for lower speeds? Wind speeds in my area, though consistent are not fast. Thanks, SK ... slower ... ...
the higher the number of coil turns, the higher the voltage. if turned slower, a 48 volt unit will put out much less (12 to 24). experimentation is the key. ...
Hello SK, The V.A.W.T. I have designed will turn with power in low wind areas, however; the RPM on this vawt and most vawts is relatively slow. The way we get...
Steve, As someone who is about to build their firsy alternator and trying to sift through all the info available I would like to ask a big favor from all those...
Another question I would like to ask is do most of you rectify at the alternator or at the batteries. I would think you would have transmitting ac at a higher...
... Wire size is determined by current until skin effects take over (at higher frequencies.) Long runs (many miles) are more efficient with extremely high...
I rectify at the batteries, for the simple reason if lightning takes out the diode bank, I don't want to half to drop the tower to replace it. Steve Spence ...
We are building a large scale alternator which will rotate at slower speeds. in order to compensate for the slowness we want to increase the number of magnets...
The obvious answer is to increase diameter. Double your diameter and you double the speed at which the magnets pass the coils....... allowing the same output...
I've seen a counter rotating axial flux at Clarkson University. Very complex. Steve Spence http://www.green-trust.org ... From: "Stone Tool" <owly@...>...
Any thoughts on multiple rings of coils and magnets? Example: One ring set at 6" out from center and one ring set at 10". Thanks ... increase the ... ring of ...
Steve: The only thing particularly more complex than with two stationary units is the need for brushes........ The benefit of doubling the velocity at which...
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