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# Re: [femm] permanent magnets?

- To: femm@yahoogroups.com
- Subject: Re: [femm] permanent magnets?
- From: Jiri Vecerka <vecerkaj@yahoo.com>
- Date: Tue, 24 Sep 2002 00:00:34 -0700 (PDT)
- In-reply-to: <amoeiu+4fuh@eGroups.com>

    --- masteringmatlab <masteringmatlab@yahoo.com> wrote:
    > I am teaching a class next semester on brushless
    > permanent magnet
    > motor design. I would love my students to use FEMM
    > to look at flux
    > plots in these motors.
    >
    > Does FEMM have native permanent magnet material
    > capabilities? In
    > other words can I enter the remanence and coercive
    > force for a PM
    > material and have FEMM do the right thing? Or do I
    > have to use
    > current sheets, etc. to "create" magnet material?
    >

    For definition of permanent magnet you need
    demagnetization curve. You have to put coercitivity
    (Hc) and demagnetization curve shifted to origin (0,0)
    to FEMM.
    For modeling of a magnet with linear characteristics
    (for example Nd-Fe-B)you need to know only
    coercitivity and relative permeability.
    Some materials of permanent magnets you can find in
    library included to FEMM, so you don't need to put the
    information to FEMM manualy.
    More you can find in manual for FEMM.

    Jiri Vecerka

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- References:
  - permanent magnets?
    - From: "masteringmatlab" <masteringmatlab@yahoo.com>

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