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# Permeance (B/H) Variation vs. Magnet Grade?

- To: femm@yahoogroups.com
- Subject: Permeance (B/H) Variation vs. Magnet Grade?
- From: "shanteserve" <shanteserve@yahoo.com>
- Date: Thu, 20 Mar 2003 20:54:32 -0000
- User-agent: eGroups-EW/0.82

    Hello. I am relatively new to magnetics and have a question about
    circuit permeance in permanent magnet designs.

    As I understand it, the circuit permeance(Bd/Hd) is mainly a function
    of the model geometry. I seem to get significantly different
    results, however, depending on what magnet grade I choose in my FEMM
    models (I obtain these values by using "point properties" and
    selecting a specific, pre-determined point inside the magnet). I get
    similar results if I model something as simple as a bar magnet, even
    though published charts indicate that B/H is only a function of
    geometry and the effective spacing of the magnet poles.

    The FEMM results suggest that the slope of the load line is very
    dependent on the B-H curve of the magnet material. This is contrary
    to all of the published theory that I have reviewed....

    Any insight into what is causing this phenomenon? Any guidance would
    be appreciated.

    Thanks,
    Scott

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