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

PM hysteresis graph

PM hysteresis graph

PM hysteresis graph

Does anyone know where I can get a magnet characterized for all four quadrants. Electron Energy use to offer this service but it doesn't show up on their website any longer.

Clyde Hancock
Design & analysis of electric motors and generators

RE: PM hysteresis graph

What type of magnet? It's straightforward for Alnico, most hysteresisgraphs have that functionality built in. I've run curves for various grades of Alnico with our equipment.

It might be possible with a hard ferrite/ceramic. I don't think it could be done with SmCo or NdFeB.

RE: PM hysteresis graph

Ditto Mike's comment.
I am sure that I have some Alnico ones around.
With low saturation RE magnets you can get 1st and 2nd quadrant curves.

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

RE: PM hysteresis graph

Why do you need data from all 4 quadrants? if material is saturated, loop will be symmetric,1-2 quadrants should be enough.
RE magnet is unlikely able to saturate with a hysteresisgraph with a non-symmetric loop. you can try run a small piece in a VSM (up to 2T) or a SQUID (up to 5T), then convert M-H to B-H, and correct the shape with a demag factor.

RE: PM hysteresis graph

Clyde: If you need the measurement by a certified lab, I'd recommend Magnet Physics. They have a top-notch facility in Indianapolis:

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


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