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Re: [femm] Intrinsic and Normal Hc??

ahmad_m_eid wrote:

Dear all

I have a confusion when I simulate the permanent magnet in femm.

In most data sheets I have about Nd-Fe-B magnets, there are two
values for the coercive force (Hc), intrinsic and normal values.

My question is which one is used to simulate the permanent magnet in
femm?

any one knows sheet data reference for Nd-Fe-B magnet will be good.

thanks you all

ahmad

The Hc that you enter as a material property in FEMM is the normal Hc.

The "normal coercivity"is the applied field intensity required to bring the flux density to zero inside the magnet. The "intrinsic coercivity," Hci, is the applied field intensity required to reverse the direction of the material's magnetization (i.e. to "break" the magnet). There is a nice page about all this at: http://www.magnetweb.com/Sect1C.htm

Dave.
--

David Meeker
Senior Engineer
Foster-Miller, Inc.
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Waltham, MA 02451-1196
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