Magnet force shield

[Zephir]

Too bad that magnetic lines of force cannot be actually shielded permanently, only guided. Temporarily it's possible to achieve everything, but you must be pretty fast - faster than the speed of EM wave spreading in material given.

[dieter]

If I were about to measure the forces, I would first build a vertical version, containing a track for the shield magnet, sliding on soap or teflon. So the shield can be dropped in from above. Then the shield could also be suspended on a thread, hanging downd from a balance, containing a counterweight, so the gravitational weight of the shield can be reduced to eg. a few grams. Will it slide trough? How much weight is required. Adjustable track, so the optimal arrangement can be found. The push force of the stacks could be measured over a pulley. How much weight can it lift for the same distance?


Something like that.


Experimenting with a reluctance swith, I have just learned that iron "conducts" magnetism much better than a permanent magnet. You would think a PM in a gap of a core is inxreasing the permeability, but actually the opposite happens, esp. with eg Ferrite PM. Seemingly the can transport only a rather low magnetic strength, maybe limited by their own PM strength, way below saturated iron that easily reaches 2 Tesla.

[dieter]

Sorry about the typos. I can't edit it.

[Floor]

Quote from Zephir

"Too bad that magnetic lines of force cannot be actually shielded permanently, only guided. Temporarily it's possible to achieve everything, but you must be pretty fast - faster than the speed of EM wave spreading in material given."

End quote

@ Zepher

I don't understand your statement.

Even a helmet struck with a base ball bat does not actually shield the wearer's head. The force is only guided,
      also  again
I don't understand your statement.
What does  faster have to do with this ?

              thanks
                floor
...
...
@ Dieter

Quote from Dieter

"If I were about to measure the forces, I would first build a vertical version, containing a track for the shield magnet, sliding on soap or teflon. So the shield can be dropped in from above. Then the shield could also be suspended on a thread, hanging downd from a balance, containing a counterweight, so the gravitational weight of the shield can be reduced to eg. a few grams. Will it slide trough? How much weight is required. Adjustable track, so the optimal arrangement can be found. The push force of the stacks could be measured over a pulley. How much weight can it lift for the same distance?

Something like that."

END QUOTE

   I do it like this @

http://overunity.com/14311/work-from-2-magnets-19-output-2/msg487779/#msg487779
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QUOTE FROM Dieter

Experimenting with a reluctance swith, I have just learned that iron "conducts" magnetism much better than a permanent magnet. You would think a PM in a gap of a core is inxreasing the permeability, but actually the opposite happens, esp. with eg Ferrite PM. Seemingly the can transport only a rather low magnetic strength, maybe limited by their own PM strength, way below saturated iron that easily reaches 2 Tesla.

END QUOTE

I started this topic in 2013 but never got back to it.  I decided to work with the magnets only/

http://overunity.com/13354/perm-magnet-only-core-with-iron-shell-motor-coil/msg354318/#msg354318



Not worried about typos
                    regards
                         floor

[dieter]

That's some intetesting plans there, reads like a patent.


Of course, your test installation doesn't require my advice. When it comes to testing, I really use what's at hand, like wood, cardboard, glue and of course sticky tape. As long as it does the job.


But I wish I had the time, patience and resources to do that like in your pictures.