INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Close proximity magnets and demagnetism

Close proximity magnets and demagnetism

(OP)
Hi all,

My first post here.

I am looking to use two strong magnets, to repel each other, in close proximity.

Neodymium, same strength, same dimensions

They will not touch, but over time will the close proximity demagnetise them?

Heat is no issue and they will not be hammered in anyway, one will revolve (but not change position), while the other stays static

Any help would be greatly appreciated

Kindest Regards

Surreall

RE: Close proximity magnets and demagnetism

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.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Close proximity magnets and demagnetism

(OP)
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

RE: Close proximity magnets and demagnetism

(OP)
Bump it up

Any more thoughts on how long they would last?

Rgds

Surreall

RE: Close proximity magnets and demagnetism

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

RE: Close proximity magnets and demagnetism

Dear!

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

RE: Close proximity magnets and demagnetism

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close