Magnetic shield by use of a second magnet - A better way I think.

[Low-Q]

Hi,

I hope you guys can look into this idea. The idea is to cancel a magnetic attraction or repell by using another magnet. I have some screenshots from the FEMM which I hope you will understand. The polarity is marked with small arrows inside the magnets.

In the first picture I show you how to cancel a magnetic influence by using two magnets close to eachother, but where the magnetic field points in opposite directions. The following examples are not fully correct, as I should have made them in 3D, but i will try to explain.


NOTE: The small magnets are magnetized horizontally with opposite directions, and the big magnet is magnetized vertically (north up). The big magnet is in the foreground, and the small ones are in the background.

Take the first picture "Cam-magnet-array-1"

The two magnets at the left side are suppose to be at the same distance from the big magnet at the right side, so you don't get confused about which magnets at the left side is most affected by the big magnet at the right side.

The big magnet does not see neither a south or a north pole from the small magnets. So there is no attraction between them, other than the attraction to the magnetmaterial itself.


In the picture "Cam-magnet-array-2", the two magnets on the left has slide apart vertically because they are locked horizontally. Now the big magnet will attract to respectively north and south, and wants to go to the left.


In the picture "Cam-magnet-array-final" I have made several small magnetsetups. As the big magnet X is moving to the left, a pushrod is forcing magnets in B together. This takes a huge amount of energy. However, the magnets in C are sliding apart with the same force. As both B and C are linked, it should not require energy to slide them in one direction or the other.

Now, A and B is attracting, and C and D is repelling the big magnet. This will force the big magnet to go to the left. Look close to this final picture, and see that the small magnets are not sliding across eachother, so the first of the two small magnets will allways be located in center or below - the opposite with the second magnet.

The sliding movement in the small magnets are suppose to be angular to the magnetic field from the big magnet. So there should not be any force from the big magnet to prevent these magnets to slide up and down. The idea is then to keep the directional force between the small magnets and the big one, and at no cost make an attracting magnet to the left, a neutral magnet in the middle, and a repelling magnet at the right side. NOTE: Each small magnet pair is suppose to act like one magnet that is altering in magnetic flux, just by sliding apart and together.

Those big green arrows in the last picture is the direction of movement of the magnets as the big magnet moves to the left.

I know I'm not a good "explainor", so please ask if there is anything unclear. For those who understand this, please let me know your thaughts.

Vidar

[lumen]

I have been doing some testing along these lines and have found some unusual results. I have new magnets ordered to build a test device that previous testing has shown would be OU.
Of all the test setups I have done, only one other has shown any indication of OU, but this expanding magnet concept does show some unusual results.

[lumen]

Could you also try your FEMM with the small magnets in attraction to each other?
You could achieve the same results without depleting the fields.

[Low-Q]

Could you also try your FEMM with the small magnets in attraction to each other?
You could achieve the same results without depleting the fields.

You mean to test it when all the small magnet pairs are magnetized in the same direction, but still having the sliding function? And no change to the big magnet?

My idea was initially to use a magnetic field to attract another magnet, then collaps the magnetic field with the sliding function, and by the same function determine when and where the magnetic field reoccoured behind the big magnet.

My first thoughts about your request, is that the magnetic field will allways be present, and detected by the big magnet...I guess then you now will have a sticky spot somewhere, and in addition the big magnet will attract at the top, and repell at the bottom - forcing it to align horizontally with no movement sideways.

I'll do some simulations, so we'll see.

Vidar

[broli]

Thanks for sharing. You idea seems interesting,

I believe you have to watch out for the height of the big magnet. If it's too long it might not attract too good, even worse it might start repelling. It should be at all times be smaller than the "virtual" magnet you create by those two magnets. In most ideal cases it should be a very very short magnet almost being a single dipole. That way you're sure the attraction will win.

I also don't understand why you're using 2 sets of magnets. You can use a single set to attract and repel. At TDC the magnets should keep on moving which will cause the big magnet to repel.