×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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.

Students Click Here

Magnetic shielding.

Magnetic shielding.

Magnetic shielding.

(OP)
Sorry if this seems like a complete newbie question.. I don't have much knowledge about magnets.

What I am trying to do is magneticly shield half of a magnet, so that only one side is magnetic.

Here is an illustration of what I would like to do:
http://img.photobucket.com/albums/v214/shiznannigan/shielding.jpg

My first question, obviously, is will it work? I know things like computer speakers are magneticly shielded, but I'm not sure exactly how, or if it would work for only one side of a magnet.

My second question is, would the strength of the magnet, or it's lifespan, be comprimised?

My third, and hopefully final, question, is what material would be ideal for shielding? I've heard brass and copper will work best, as I obviously don't want the shielding material to be magnetic.

Any help with any of these questions would be great. Thanks!

RE: Magnetic shielding.

Non magnetic materials will provide zero shielding from static magnetic fields.  A low carbon steel cup with the magnet inside will work.  The wall of the cup must be larger than the magnet so the north and south pole are not "shorted."  The steel must be thick enough so it isn't saturated by the magnetic flux.

RE: Magnetic shielding.

There is just nothing in nature that will stop a magnetic field like an electrical insulator stops an electrical current.
Also there is no such thing in nature as a monopole, a magnet with only a north (or south) pole: the magnetic field works necessarily in closed circuit and any operation with magnets assumes that a circuit is created. Or, in other words, if you kill one pole with a suitable shielding material, then in fact you short circuit your magnet, making it useless.
So you should first of all specify what you want to do with that magnet and build a working application; then you should specify what and how much you need to shield from the field.
And, confirming what sreid said, brass and copper will do just nothing to your field, only a ferromagnetic material (suitably dimensioned) will provide some shielding.

prex

http://www.xcalcs.com
Online tools for structural design

RE: Magnetic shielding.

Shielding materials are magnetic. They redirect field rather than really shield and as such shielding on one pole of magnet will affect lines of flux on the other pole. Trial and error may get a field suitable to your requirements.
Try www.magnetic-shield.com for materials.

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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