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# Re: BH data

- To: femm@yahoogroups.com
- Subject: Re: BH data
- From: "mikejhutch" <mhutchings@solartronmetrology.com>
- Date: Wed, 23 Oct 2002 08:09:42 -0000
- In-reply-to: <ap4d00+amtj@eGroups.com>
- User-agent: eGroups-EW/0.82

    Yes I am interested in a.c. behaviour up to 10 kHz or so. Due to the
    very high permeability of radiometal the skin depth will be very
    small. Thanks for the insights; I can proceed with more confidence
    now....I think.

    Mike

    --- In femm@y..., "David Meeker" <dcm3c@e...> wrote:
    > This is a good question. Traditionally, people have used the
    initial
    > magnetization curve as the BH curve in magnetostatic simulations.
    If
    > you have this info, it is OK to use it as your BH curve for
    > magnetostatic simulations.
    >
    > However, it sounds like you are actually interested in AC
    simulations.
    > Even though the program accepts a nonlinear BH curve, the nonlinear
    > BH curve is ignored for AC simulations and the linear values of
    > permeability are used instead. (strictly speaking, harmonic analyses
    > are well-defined only in the case of linear materials) In this
    case, a
    > good approach would be to pick a characteristic RMS value of H that
    > your material would see and then pick the corresponding point on the
    > BH curve corresponding to this value, calling it Brms. The
    > permeability that you'd use would for your simulation would be
    Brms/Hrms.
    >
    > Dave.

- References:
  - Re: BH data
    - From: "David Meeker" <dcm3c@earthlink.net>

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