Re: [femm] H in magnets

[David Meeker <dmeeker@xxxxxxxxxxxxxxxxx>]

I seem to remember some discussion about this a while back.  Check
out Message 607. 
There's a link to some explanatory info on that page that I think has gone
bad since the message was posted.  Instead, look at:
http://www.magnequench.com/tech_resources/tech_center/reference/reference_main.html

Dave Meeker
 

marco valcavi wrote:

Hi!

I noted that there is a strange calculation of the H
field in the permanent magnets.

I inserted data about a ceramic ferrite, following the
instruction, so I shifted the demagnetization curve to
the right to meet the origin.
I include this magnet in an axisimmetric magnetic
circuit with steel and a gap.

Inspecting with FEMM (3.0 and 3.1) the H field, I
found that the output of the H field (Hout) is
different from the correct value (Hcorrect):

  Hcorrect=Hc - Hout

where Hc is the coercitivity field .

This strange value affect all the calculation based on
the H field inside the magnet.

bye (ciao)

Marco
 

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