Electromagnetism Effects on Permanent Magnets

[Golden Mean]

Greetings fellow OU enthusiasts!

What happens to a permanent magnet if you wrap a coil around it and run a charge through the coil?  I'm curious if this can be used to temporarily increase/decrease a permanent magnets strength at the gate area of a magnetic motor/generator.  Anyone have knowledge on this or can point me in the right direction?
Thanks.

~Golden Mean

[Honk]

No, you cannot temporarily switch of the flux level by a wrapped around coil.
But you will damage the magnet if the induced dynamic field strength is to high in reverse.

This question have been up several times.
http://www.overunity.com/index.php/topic,2751.msg56551.html#msg56551

Quote:
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The force field in a magnet is static even if the magnet is moving, That has got to do with the source of the force.
The source of the force field in a magnet is the magnet itself, due to the molecular alignment. Hence the description "static".
In an electromagnet, the force is "dynamic" because there is a flow of current. It's the Amperes that demagnetise the magnet.
And to demagnetise it, the whole magnet must be inside the force field of the electromagnet. In a rotating motor only the poles/tips
are exposed, hence degradation is not present. There is always some shape degradation (natural loss of power) but that is irrelevant.
For Neo magnets its around 5-10% in 100 years. That's all.
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I'd like to add that it will take a super conducting coil to damage a NdFeb magnet. An ordinary coil is to weak.
NdFeb magnets is extremely resistant against demagnetization.

[FreeEnergy]

Greetings fellow OU enthusiasts!

What happens to a permanent magnet if you wrap a coil around it and run a charge through the coil?  I'm curious if this can be used to temporarily increase/decrease a permanent magnets strength at the gate area of a magnetic motor/generator.  Anyone have knowledge on this or can point me in the right direction?
Thanks.

~Golden Mean

hi,
i was thinking the same thing the other day. not sure but i think it is true that if you wrap coil around a magnet you can increase its magnetic field. but only if the charge/current is greater than the magnet's magnetic field. i guess you can only increase and not decrease im not sure. actually maybe you can reverse the field and actually decrease the magnetic field by applying a reverse charge/current. this kind of thing could be applied to the tri-gate project http://www.overunity.com/index.php/topic,4142.0.html


i think paul sprain did something like this http://peswiki.com/index.php/Directory:Paul_Harry_Sprain_magnet_motor

[Koen1]

I'd like to add that it will take a super conducting coil to damage a NdFeb magnet. An ordinary coil is to weak.
NdFeb magnets is extremely resistant against demagnetization.

Yes and no.
Neodymium magnets are known to be internally conductive as well as relatively brittle.
When exposed to other strong magnetic fields and moved through them, depending on the
overall field strength and shape of course, Eddies can be created inside the Neodymium material,
which can very well disrupt the material structure locally and cause the magnet to demagnetise
in that specific location. This can weaken the material structure and cause it to become relatively
more brittle, and some accounts of Nd atoms coming off as a "vapour"/"gas" have even been spotted.
This does not necessarily go for all Nd-containing magnets, and only in specific circumstances
(foucault-type homopolar experiments for example).

Another factoid is that the new "supermagnets" are not as permanent as the "old" ferrite magnets.
Where the older but weaker magnet types can retain their magnetism really almost permanently,
the newer alloy supermagnet types are stronger but less structurally stable, often slightly internally
conductive, and because of this not truly permanent. Just really long period magnets.

[Liberty]

I wonder if it is possible or probable that an eddy current could be formed on a Neo magnet if the Neo magnet material is in a magnetically saturated condition?

Isn't a magnetically saturated material (like a Neo magnet) "full" of magnetism to the point that it can't hold any more?  I'm wondering how an eddy current could form in an already magnetically saturated state?