×
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!
  • Students Click Here

*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

Jobs

Magnetic core uniformity

Magnetic core uniformity

Magnetic core uniformity

(OP)
I am building a C-core similar to the one shown below.  there are coils on both down "legs" of the core, and run in complementing polarity.  Size constraints prevent me from using uniform cross-sectional area for the vertical and horizontal sections of the core.  The horizontal x-section is only 25% the area of the vertical legs.  How much of an impact will this have over a core with uniform dimensions in regards to flux generation at the poles? Would I be better off reducing the size of the coils but increasing the thickness of the horizontal section?  Is FEA the best way to make this determination?

___________
|   ______   |
|  |          |  |
|  |          |  |
|_|          |_|

RE: Magnetic core uniformity

FEA and a bit more information is one way to analyse this. The horizontal section only needs to be large enough to carry the flux that gets there. However one might guess that being only 25 percent of the core would not be enough. If this makes your circuit out of balance you would be wasting much of the ampturns your coils generate.

Mike

RE: Magnetic core uniformity

Mech133,

It's not possible to be certain from the information that you have supplied.  However, MJR2 is correct, if you are attempting to drive the verticle "legs" anywhere close to saturation, and they are the same material as the horizontal portion of the frame, then the reluctance of the horizontal section will be very high soaking up a bunch of the input power.

This does not require FEA to solve.  A simple sum of the reluctances math model can be generated via Roter's method, and can be used to optimize the design for steady state.  This is easily accomplished via a spreadsheet.

-Tony Staples
www.tscombustion.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!


Resources