Electromagnetism Effects on Permanent Magnets

[Golden Mean]

Thank you for the replies.  My idea is not to "shut down" a NIB magnet but to disrupt it at one end somehow... electrically induced temporary shielding. 
I've read that wrapping a coil around a magnet and aligning the polar arrangement of the magnetism will increase the strength of the magnetism overall.  It stands to reason that any magnetic flux in the opposite direction should decrease the overall strength, shouldn't it?  Or at least change the flux patterns to reduce it's strength with respect to the geometric arrangement of the permanent magnets.

Magnetic material degradation is definitely a cause for concern.  If the permanent magnets don't hold up, this idea won't fly.

Does anyone have any good online resources to look into regarding this concept?

Thanks again!

~Golden Mean

[Honk]

Try to wind a coil around a neo and you'll discover that you can't affect a neo by a simple standard coil.
You must use a superconducting coil to create a field strong enough to affect the very resistant field from a neo.
But you will end up hurting the magnet in this process.

Neos are magnetized by being placed inside a superconduting coil, and also demagnetized if desired.
But feel free to try out your idea. Testing is learning. And please report your findings here at OU forum.

[gyulasun]

....
I've read that wrapping a coil around a magnet and aligning the polar arrangement of the magnetism will increase the strength of the magnetism overall.  It stands to reason that any magnetic flux in the opposite direction should decrease the overall strength, shouldn't it?  Or at least change the flux patterns to reduce it's strength with respect to the geometric arrangement of the permanent magnets.
....

Hi,

I think Jack's magnetic valve principle covers your idea pretty well, the difference maybe is that he first wraps a ferromagnetic material around a permanent magnet and then winds the coil around this "jacket".  See this link:
http://peswiki.com/index.php/Director:Hilden-Brand_Electromagnet_Motor  with his drawings on the concept.
Jack is also a member here and has got a separate thread on his motors with the valves.

rgds,  Gyula

[Koen1]

hmmm... "Jacks magnetic valve principle"?
That's a well known principle commonly referred to as a "flux gate" by
many FE experimenters... what's Jack got to do with it?

@liberty: well, a magnetically saturated material should indeed not
be able to "conduct" more magnetic flux through itself,
but that does not automatically mean there is no room for variations
in the flux density of the magnet, nor that the magnetic saturation
is automatically homogenous. Variations in magnetic field strength and/or
permeability plus any form of motion will lead to eddies, except if the
material itself does not allow for it.
Typically the new supermagnet alloys are more electrically conductive
than the old permanent ones, and their magnetic zones are mostly of
a different type (speaking in terms of molecular structure).
As far as I know.