Re: Voodoo engineering
- From: ehsjr <ehsjr@xxxxxxxxxxxxxxxx>
- Date: Thu, 09 Nov 2006 06:26:20 GMT
default wrote:
On 8 Nov 2006 10:56:42 -0800, "Macgyver" <craigs@xxxxxxxxxxxxxxxx>
wrote:
default wrote:
I was looking to tinker with some magnets and build a brushless motor
and came across something unusual. It is a perpetual motion machine -
and I can't see why it won't work. Can someone 'splain it?
<snip>
NOT ANOTHER MAGNET PERPETUAL MOTION MACHINE DESIGN. GAAAAAAAAHHH. All
you are seeing is a smoke and mirrors trick. You put energy in to
start the cage turning, the cage eventually stops turning after a
certain amount of revolutions. Remove magnets and try again using same
input force to start cage turning. Hey, it turned more times <sigh>.
From what I read, the only energy input is to place the repelling
magnet where it will influence the rolling magnet - no need to start
turning the cage.
The article in the link said it best......."The rpm on mine was slow
maybe 50 rpm. It turned about 16 turns before the top magnet hung up on
the side plate. I have not been able to get it to work that long
since".
I suspect that is where he takes the rolling magnet out of the cage
and rests it on the outside of the cage, and places the repelling
magnet below it.
Like I mentioned, the writing leaves a lot to be desired. The
author(s) reference to three different ideas one is supposed to
already be familiar with (also involving perpetual motion.magnets) and
three variations of this idea - repelling magnet outside the cage,
repelling magnet inside the cage but fixed to the axle and not moving
- but forcing the rolling magnet away and downward, and putting the
rolling magnet outside the cage and trying to get it to climb the
cage.
I think it is that last idea where he can't keep the magnets aligned
and keep it turning. On the outside of the cage - the friction and
rolling direction both work in favor of the cage turning.
What should happen with the internal rolling magnet, is the magnet
should roll away from the repelling magnet and part way up the
opposite curve then stop - friction would prevent it from allowing the
hamster cage to drop back to weight equilibrium - the magnet and that
part of the cage would be pushed away from the repelling magnet
That's where the ball bearings come in I suppose. Decouple the
rolling magnet from the inside of the hamster cage.
Another case of lack of BASIC scientific and motor knowledge, as well
as incomplete and/or piss-poor lab work and results. Nothing magic
about it. Just plain wrong.
Probably.
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If there is 0 friction, the rolling magnet reaches
a point of equilibrium where gravity and magnetic
repulsion are equal. The cage does not move, due
to 0 friction. If there is friction, the rolling
magnet moves away from the fixed magnet, taking the
cage with it, bacause of friction. It reaches a point
of equilibrium as before, and holds the cage there,
due to friction. In either analysis, equilibrium
will be reached and the motion will stop.
Ed
.
- References:
- Voodoo engineering
- From: default
- Re: Voodoo engineering
- From: Macgyver
- Re: Voodoo engineering
- From: default
- Voodoo engineering
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