Permanent magnets and the electromagnet

[capthook]

Here are a few previous posts elsewhere on this forum relating to this that you may find of interest:

http://www.overunity.com/index.php/topic,1621.msg16347.html#msg16347
http://www.overunity.com/index.php?topic=5929.msg134797#msg134797
http://www.overunity.com/index.php?topic=5929.msg135741#msg135741


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Placing a small magnet at the far end of the electromagnet in repulsion to the armature magnet will negate the attraction of the armature to the core (providing a sufficient airgap) requiring less power to repulse.
Also, the electromagnet core now already has some of the domains aligned.  When the power is introduced, it provides a greater effect.
ie:
end magnet: 5,000 Gauss
power em: 5,000 Gauss
when used together: 20,000 Gauss - a doubling of the Gauss
(not exact figures - just presenting the idea)

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"there is known "trick"  or idea to defeat the attraction between the core and the permanent magnet so that you can even get a benefit of not using extra input power to defeat it.
About 2 years ago I mentioned this idea here, see:  http://www.overunity.com/index.php/topic,1621.msg16347.html#msg16347  and the link to that old patent is here, the old link mentioned there now needs log-in, this one is not: http://www.pat2pdf.org/patents/pat3670189.pdf
(explanation in Page 12, Column 2,  from line 31 and onwards)
rgds,  Gyula"
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[capthook]

You could also use copper around your coil to get a stronger pulse from your electromagnet. The coil must be fairly flat though. That principle is used in transformers.

Would you please elaborate on this?  Details, methods, construction, links, data, theory etc. etc.

Thanks!

[Michelinho]

Hi capthook,

I first saw its use in a coil on the ROMAG motor generator as a copper pipe length that surround the rotor and act as the coil winding core. It is used to reverse the field to prevent cancellation of the output and have the coil produce from all its magnet wire length.

We then experimented by applying a copper shield 1/16" thick in different position and coverage of the coil, the best results were about 1/4 of a regular coil circumference and we saw an increase in the output of the same coil over the unshielded coil. We use the oscilloscope to check the output and it did show a significant increase. If there is an increase in the output then the magnetic field is concentrated in the coil and not outside.

I hope this helps in understanding the concept.

Take care,

Michel



It is tests we did and we just noticed it and thought it could be of use in the future on boosting a Bedini window motor based replication we are designing at the moment and should start construction in the coming weeks.

[wings]

Well, I think I've figured it out. Someone let me know if this makes sense.

Normally, the rotor magnets are attracted to the steel core. There is a lot of rotational resistance due to the strong attraction.

By placing magnets on the opposite side of the steel core, a huge amount of repulsion appears on the rotor side of the steel core. This results in a minimum amount of 'stick' and the rotor can spin up faster with much less resistance.

"By placing magnets on the opposite side"

Oooops... see this patent by Lockheed Martin Corporation:

Patent number: 5929732

http://www.google.com/patents?id=V7YYAAAAEBAJ&dq=lockheed+magnets&rview=1

"high power electromagnetis impulse EMP" ...."can also transport electromagnetic charges through a distance...."

Also you have a similar configuration ...  in the rotor if you put the magnet in the same way around the rotor ...Bedini obtain charges .....