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Posted by vaughn on February 17, 2010, 9:41 pm
 




Because they generate an insignificant amount of power.
"Most modern hub dynamos are regulated to 3 watts at 6 volts, although some will
drive up to 6 watts at 12 volts."

http://en.wikipedia.org/wiki/Hub_dynamo


Vaughn



Posted by sno on February 18, 2010, 12:08 am
 


On 2/17/2010 1:54 PM, harry wrote:

Hadn't thought about slippage with water lubrication....can only think
of two ways you can stop slippage with tires.....studded winter
tires...or chains.....wonder if one of them would work....have fun...sno


--
Correct Scientific Terminology:
Hypothesis - a guess as to why or how something occurs
Theory - a hypothesis that has been checked by enough experiments
  to be generally assumed to be true.
Law - a hypothesis that has been checked by enough experiments
  in enough different ways that it is assumed to be truer then a theory.
Note: nothing is proven in science, things are assumed to be true.


Posted by Michael B on February 18, 2010, 2:08 am
 

Here's the deal. Local windspeed averages 9.8 miles/hour.
So regularly it would be less, but still desirable to have
rotation. And the bigger the collecting surface, the more
the power, but still less than about 12 RPM.
So to be of any value, the end speed needs to be sufficient
for reasonable power.
And it's in an urban setting, so not practical to be 35 feet
above obstructions within 300 feet. Pretty much excludes
a HAWT. But the conditions are right for a VAWT,
especially since it doesn't care where the wind is coming
from, or how much turbulence it holds.
But it's at the ground, and a generator under "certain"
conditions would be a high theft item. Even a treadmill
motor can't generate if it's been stolen.
So I want to hide the generator in plain view. Starting with
gears made of wood. Going for a ratio of about 4:1 several
times, with the first gear 4ft diameter, giving a circumference
of about 12 1/2, second gear at 1ft diameter, circumference
being pi. Attached to the pi gear, another 4ft one, and so on.
Rotation speed of 5 RPM initially, the pi gear would be at
about 20 RPM, so its 4ft attached one would be at 20. So
the next pi gear would be at 80. So would its attached 4ft
one. Next pi gear would be at 320, as would its attached
4ft one, so its pi gear would be at over 1,000 RPM.

Why am I interested in doing it this way? I want to imbed
magnets in that next 4ft one, and let it look like any of the
other gears, have it at the very bottom on a concreted base,
and have the stator hidden there.

About 60 magnetron magnets in 2 1/4" holes in the underside
of a 4ft plywood circle looking exactly like all the others, and
having an automobile alternator as its apparent destination.
next

All right, so it's almost a toy, with very low investment. With
a check-valve turbine making it turn. Making a 100 square ft
area being presented to the wind at any time. Total investment
well under $00, I've already got the magnets. And could cover
the wooden "gears" with sheet metal to obscure having covered
the magnet portion of the last one with transformer laminations
from microwave transformers.

No problem cutting the gears with a table saw, but I need a
credible way of transferring power from one gearset to the next
with minimal loss.

Comments?



Posted by ghio on February 18, 2010, 12:34 pm
 


This is in fact not true. Turbulence = loss of energy.


Be lucky if it turned at all with the accumulated losses.

Too many losses.



Posted by Jim Wilkins on February 18, 2010, 2:31 pm
 


Perhaps you could attach some sort of cogged belt or chain inside a
rim on the wheel to make a concealed planetary ring gear, then put the
sacrificial rusty-car-altenator drive on the outside.

jsw

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