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 Posted: Tue May 08, 2007 2:28 pm
If there was a circlular disc, with 4 to 6 stations on it that have magnets at a slight slant, all repeling in one direction, then in the middle there was an inverted "L" shaped rod that could swivel around, having a slightly slanted magnet on the end of it, repeling the magnets on the disc, could that make a perpetual motion device? It could be used for energy even, turning a crank, like a generator.
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Posted: Tue May 08, 2007 4:09 pm
Doesn't work. Magnetic fields aren't linear.
But to be more general: Perpetual motion cannot work. There's this magical thing called conservation of energy.
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Posted: Tue May 08, 2007 9:00 pm
perpetual motion might not be scientificly possible, but I have a kid that is perpetually in motion...does that count? wink
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Posted: Wed May 09, 2007 1:08 am
Those pesky laws of thermodynamics keep getting in the way of perpetual motion machines like this. Your device would require bearings on the shaft of some sort, and these bearings, no matter how slippery, will never be frictionless. Therefore they will heat up slightly and this heat will radiate away. So, as energy has been lost from the system, the system must slow down and eventually stop.
Also, as was previously stated, magnetic fields do not work in a linear fashion; as the magnet mounted to the shaft approaches the next magnet in the sequence there would be a repulsion, effectively braking the shaft's rotation. This could be solved by having the magnets switch polarity, so they attract the approaching magnet and then repel it as it passes. This has, of course, been done - it's called the Electric Motor.
The nearest thing I can think of to a perpetual motion machine would be a ball spinning in deep space, light years from the nearest large astronomical body. But even this would eventually stop spinning, because of energy loss in the form of heat through friction between the ball's structural molecules due to tidal forces. Basically the outer layer of the ball is affected more by centrifugal force than the core, so the layers are trying (ever so gently) to separate. This causes friction.
I'm afraid the laws of thermodynamics appear not to be flawed. Perpetual motion is not possible in the real world.
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Posted: Wed May 09, 2007 12:47 pm
darn basic laws...WHY NEWTON...WHY?
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Posted: Sat May 12, 2007 9:09 pm
I had a similiar idea in high school. Didn't work although it was rather close to and electric motor (minus the electro magnets). Even if you were able to organize it in such a way that it began moving (I never managed to get that work) the magnetic domains and strength of your magnets would degrade overtime.
Law of conservation of energy, the potential energy in your magnets would gradually erode by one mechanism or another (like I mentioned earlier my money is on the Domains shifting over time in the event that you could get it started and working).
Look at a diagram of an electric motor some time (or better yet get a kit and build one) it is very similiar to what you are describing.
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