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Overunity Machines Forum



a strange finding

Started by Cairun, July 09, 2011, 11:54:16 AM

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Cairun

July 09, 2011, 11:54:16 AM
Hi all,

I found something interesting lately, something that has intrigued me.
I had two rectangular magnets in repulsion; and I placed a bar of steel on top of the two magnets.
I found that the attraction between the bar and the magnets would be stronger when you forced the magnets together than when they are apart.  I do not understand what is happening there.  I would appreciate it if anyone can provide answers or opinions.

Thanks,
Alex

futuristic

#1
July 09, 2011, 01:09:13 PM
If I have time I will model this in FEMM, but out of the head I would say that when magnets are close in repulsion the path of magnetic lines is shorter and the density of magnetic field on the opposite end is therefore greater.

futuristic

#2
July 09, 2011, 01:32:25 PM
Here it is...
Huh the sim shows that force is greater when there is no magnet near in repulsion mode:

Only one magnet (iron block is the one on the right):
http://file.si/pfiles/183617/no-repulsion1.png

Two magnets in repulsion:
http://file.si/pfiles/183616/repulsion1.png

Perhaps I did not do the simulation correct? FEMM file is in the attachement (change the extension to .fem)...

MrMag

#3
July 09, 2011, 02:30:11 PM
My guess is that since the magnets are opposing, the flux lines are fighting each other. When the bar of steel approached the magnets, the flux will tend to be attracted the bar instead of fighting the other magnet. I hope this makes sense.

Cairun

#4
July 10, 2011, 12:15:02 AM
Quote from: futuristic on July 09, 2011, 01:32:25 PM
Here it is...
Huh the sim shows that force is greater when there is no magnet near in repulsion mode:

Only one magnet (iron block is the one on the right):
http://file.si/pfiles/183617/no-repulsion1.png

Two magnets in repulsion:
http://file.si/pfiles/183616/repulsion1.png

Perhaps I did not do the simulation correct? FEMM file is in the attachement (change the extension to .fem)...

Thank you for answering my question.  However, the set up I had was different from yours.
I had the iron bar centered and on top of the two magnets.  Would you run the test again with this set up, please?
I downloaded the attached program, but I was not able to change the file extension to .FEM.  Do I need a special software to run this program?

Thanks,
Alex
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