Close proximity magnets and demagnetism

• Jul 13, 2011

• #2

EdStainless

Materials

May 20, 2004

16,357

Waukesha WI USA

They will demag some, or you wouldn't end up with any force.
Will the gap between them fluctuate? if so then you will have a bit more demag over time. Even slight changes in temperature will cause significant demag.

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Plymouth Tube

 

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• Jul 13, 2011

• Thread starter
• #3

Surreall

Mechanical

Jul 13, 2011

3

GB

Yes the distance between will fluctuate, around 1mm or so. And spin would be around 100 rpm

How long can i expect them to take to demagnatise? hours? days? years?

Heat change would be around 2 or 3 degrees

I am looking at magnets with around a 20kg pull

Regards

Surreall

 

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• Jul 21, 2011

• Thread starter
• #4

Surreall

Mechanical

Jul 13, 2011

3

GB

Bump it up

Any more thoughts on how long they would last?

Rgds

Surreall

 

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• Jul 21, 2011

• #5

sreid

Electrical

Mar 5, 2004

2,127

US

To keep things simple, under the conditions you intend to use Rare Earth Magnets, they will not demagnitize.

 

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• Jul 21, 2011

• #6

metalparts

Industrial

Jul 7, 2011

18

Dear!

I keep the same idea with SREID, if the Magnets has the same magnetic properties, it is hard to be demagnitized .

 

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• Aug 4, 2011

• #7

leslie2000

Materials

Jun 11, 2008

22

JP

If you are using rare earth material, the demagnizing level is very small according to your discribe. In the production, sometime we do "aging process" to the magnets, the magnetic property will be reduced by 3-5%, and after that, the magnets will be stablized. So i think your case will be less than this.

 

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