Posted by Jim Rojas on November 24, 2010, 10:15 pm
We are talking about generating more power from stators, not running
motors with conventional methods.
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Posted by amdx on November 25, 2010, 1:05 am
So is your objective to increase the amount of power put out by a
generator at a certain rpm?
Or, Do you want to take a 300 watt generator at max rpm and add
magnets to make it a 600 watt generator?
Posted by Jim Rojas on November 25, 2010, 1:18 am
With conventional stator coils, you do not capture all of the magnetic
flux because there isn't anything to attract or contain it. By using a
steel core in the center of the coil, you are focusing more magnetic
flux to a single point. Thus, more output from your coils.
If you are using a 1 inch magnet, the steel core must be no smaller than
a 1/2 inch. The larger the magnet, the larger the steel core has to be,
otherwise magnetic flux will be lost.
So a 1 inch core, using 1/2 inch steel core, then you wind coils at no
more than 100 turns, should give you 2-3 times the normal output.
Posted by Michael B on November 26, 2010, 2:01 pm
So what are the real details about the Hummingbird
motor and the Sundance generator?
Posted by Jim Rojas on November 26, 2010, 2:23 pm
Michael B wrote:
From what I understand, the hummingbird motor uses powerful Neodymium
magnets to create more horsepower, but it still requires power to push
it. 3 phase AC using an AC drive controller would be more efficient.
The Sundance generator uses 3+ x 1+ inch permanent magnets and what
looks like a U shape stator coil. Magnets in this size, generate 300+
pounds of pull force. The magnetic rotor is in the middle. 2 sets of
stators are on each side. I like the idea of being able to replace any
stator that fails, but in their video, it's not that simple to
replace...since the stator does have a iron core, it will take a tool to
separate it. This is something their video doesn't mention, but if you
think about the forces in play here, it makes more sense.
You really don't need to use 3 inch mags to produce good power, plus
those mags will set you back alot of green. I suggest you start off with
1 x 1/2 inch mags, with countersunk holes, so you can experiment. You
can always stack mags to get more power. You can buy 1x1x1/2 block or
round mags for under $ each. Make sure you use brass screws or bolts to
mount them. Some stainless steel screws are non magnetic. Test the
screws with a small magnet before you buy them.