×
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

Magnet saturation at magnetization

Magnet saturation at magnetization

Magnet saturation at magnetization

(OP)
I'm working with a supplier to magnetize a full rotor (multiple magnets, Neodymium). They state that they can only get an average of 95% saturation for each magnet (simulation). What are the risks to not fully saturating the material?

Clyde Hancock
Design & analysis of electric motors and generators
www.motorconsultants.com

RE: Magnet saturation at magnetization

It depends.
What does your grade of Neo look like when undercharged?
In some materials you may get 95% of B but only 50% of H, so not good.
But some grades are not like that.
And is it uniform?
How hard are you going to be working it, and how hot will it get?

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Magnet saturation at magnetization

this is a general question. the general answer is you donot use materials full potential. a bit more specific, you are working on a minor magnetization curve. if you design to the max BH, both you Bd and Hd can be sacrificed. If the operating point falls below "knee" point, you will have a risk of irreversible de-mag. the risk cold increase as the temperature increase with motor operating.

why cannot be fully saturated? i guess you use a fixture to magnetize the whole assemble? any way to magnetize
each Noe magnets separately?

RE: Magnet saturation at magnetization

(OP)
I am magnetizing as an assembly.

Quote (EdStainless)

In some materials you may get 95% of B but only 50% of H, so not good.

How can you have this situation?

Clyde Hancock
Design & analysis of electric motors and generators
www.motorconsultants.com

RE: Magnet saturation at magnetization

If you start drawing minor magnetization curves you will see that the behavior varies a lot depending on the grade of material.
In general the higher the saturation Hci the lower the fraction that you will get with sub-saturation.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Magnet saturation at magnetization

For very high Hci material, you "waste" a large H for some magnetic circuit (assembly) or in a (BH)max; for a very low Hci material, you waste "B".

RE: Magnet saturation at magnetization

(OP)
Thanks everyone!

Clyde Hancock
Design & analysis of electric motors and generators
www.motorconsultants.com

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