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Permanent Magnet

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RSS FeedRSS feed   |   Email notificationsTurn on email notifications   |   4 Replies   Last post: March 19, 2010 5:20am UTC
Jim Scott

Jim Scott

February 10, 2010 8:33pm UTC

Permanent Magnet

Hello All,

I am fairly new to Comsol and I am just beginning to learn about Magnetics. I am trying to model a permanent magnet in Comsol of 0.6T. As a result, I define the material properties as 0.6T, but when the analysis is complete, it only shows a max of 0.45T or so. Is there a reason it does this? I thought by defining it as 0.6T, that it should be max value. I would appreciate any input you all may be able to provide.

Thanks,
Jim

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Robert Koslover

Robert Koslover

February 11, 2010 6:27pm UTC in response to Jim Scott

Re: Permanent Magnet

The values of magnetic material parameters such as Br and Hci do not all by themselves tell you directly what local B and H fields will be. The magnet's geometry and the details of the magnetic circuit (including air, iron, etc) all matter a great deal. You need to learn more about permanent magnets and magnetic circuits.

For detailed guidance, see for example:
Permanent Magnet Materials and their Application (Cambridge Studies in Magnetism)
by Peter Campbell.

http://www.amazon.com/Permanent-Materials-Application-Cambridge-Magnetism/dp/0521566886/ref=sr_1_10?ie=UTF8&s=books&qid=1265912503&sr=1-10

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Ivar Kjelberg

Ivar Kjelberg
Moderator

February 12, 2010 7:05am UTC in response to Robert Koslover

Re: Permanent Magnet

Hi

I can only agree, this book is short, concise and gives an excellent introduction.

if you want to go deeper into the maths there is also, as complement the series from Springer (several volumes) starting by:

http://www.amazon.com/Magnetism-Fundamentals-Etienne-Tr%C3%A9molet-Lacheisserie/dp/0387229671/ref=sr_1_4?ie=UTF8&s=books&qid=1265958130&sr=1-4

have a nice reading
Ivar

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Jim Scott

Jim Scott

February 12, 2010 7:45pm UTC in response to Ivar Kjelberg

Re: Permanent Magnet

Thank you both for your help and the book recommendations.

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Margaret Wong

Margaret Wong

March 19, 2010 5:20am UTC in response to Jim Scott

Re: Permanent Magnet

Hi all,

i am a permanent magnet supplier, and also learn something about magnet, espesionally in the sintered NdFeB magnet field. if there is any i can do,just contact me?

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