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Overunity Machines Forum



Magnetic braking of magnets sliding along a sloped aluminum surface

Started by foxpup, May 20, 2009, 07:52:06 PM

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0c

#80
May 24, 2009, 02:51:50 PM
Summary of what we know so far, please correct me if I make any errors here:

1) The magnetic repulsion from eddy currents appears to affect the leading edge of the sliding magnet differently than the trailing edge, lifing the leading edge away from the conductive material. At the extreme, the leading edge  will "flip" away and the magnet will fall.

2) There seems to be a difference between north and south pole response, similar to what might be expected if one pole was stronger than the other. At steep angles, the magnet may "pop" off the conductive ramp when one pole is in  contact, but will slide smoothly when the opposite pole is facing the ramp.

3) There appears to be a "cling", or attraction, on the trailing edge of the sliding magnet. It is apparent even when the conductive material (aluminum or copper) is slightly past vertical.

4) Diamagnetic (copper) and paramagnetic (aluminum) materials show no difference with respect to magnet polarity. There may be a difference in the magnitude of the effect.

5) Orientation with respect to the earth's magnetic field does not seem to make any difference. The effect is identical in the northern and southern hemispheres.


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lumen

#82
May 24, 2009, 11:05:33 PM
Wow, I've been away for a week and just read this entire thread.
I like TK's video showing the effect even past vertical into a negative angle.
I believe the only way TK's magnet can hang on to a negative is because of the ring magnet he is using.

The center hole must allow some additional gripping affect from the opposite polarity to grab onto the opposite field induced in the aluminum.

That is interesting!

lumen

#83
May 25, 2009, 12:36:48 PM
I'm starting to believe the trick with magnets is not using iron, but a non magnetic metal.

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