×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

lamination thickness

lamination thickness

(OP)
I am working on the design of an electromagnet that uses silicon iron laminations.  I am looking for a formula or chart that will help me determine what the thickness of the laminations should be.  The electromagnet will operate at 0-400 hz.

RE: lamination thickness

I have never seen a specific formula that you can use, however lamination suppliers do supply design tables giving the watts loss per kg (or lb in the US) for a given peak flux density, usually 1.5T (15kg) and frequency.

An example :
http://www.orb.gb.com/
(if you select "brochures" from the products menu, then download the most appropriate brochure, e.g. Non-oriented, fully processed and look on page 25, the table shows the watts/kg at 400Hz for a range of flux densities).  If you are in the US, there is a brochure for ASTM grades.

If you know your working flux density (note PEAK values are always used, not RMS) and the total mass of steel, you can calculate the total loss.  This assumes the flux density is uniform throughout the core and it is sinusoidal.

In an electromagnet it may be possible to use oriented steel provided the flux is always in the preferred direction in all parts of the core, this is more expensive but has significantly lower loss.

You will need to design for the worst case (i.e. 400Hz), probably needing a 0.35mm grade or equivalent.

TTFN

RE: lamination thickness

thanks IRstuff, I think I'll repost this in the other thread.

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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!