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# RE: [FEMM] Need help in analytical fitting of steel B-H curve

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- Subject: RE: [FEMM] Need help in analytical fitting of steel B-H curve
- From: "Dr. Lee Marriott" <Marriott@tpresearch.com>
- Date: Tue, 20 Apr 2004 06:58:05 -0400
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- Thread-topic: [FEMM] Need help in analytical fitting of steel B-H curve

    Tsarafidy,

    	A simple, but not extremely accurate BH model was developed by J. Brauer (1975).

    	Reluctivity = k1*exp(k2*B*B)+k3, derviative d(rel)/dB^2 = k1*k2*exp(k2*B*B).

    The equation fits the curve for Rel as a fct of B^2. Three points from the BH curve, one from the linear region, and the other two just below and above the knee are used for the fit.  See "Computer-Aided Analysis and Design of Electromagnetic Devices," by Hoole (1989) for comments and some other BH curve approaches.

    	The Rel=fct(B*B)is used in many magnetic FEA formulations for integration using higher order elements.

    Lee

    -----Original Message-----
    From: Tsarafidy RAMINOSOA [mailto:tsarafidy@yahoo.fr]
    Sent: Monday, April 19, 2004 9:11 PM
    To: femm@list.foster-miller.net
    Subject: [FEMM] Need help in analytical fitting of steel B-H curve

    Hello All,

    I'm searching for an analytical form of a function
    with known derivative, other than piecewise
    polynomial, fitting B-H curve of a given steel.
    Any paper or advice about this will be appreciated.

    Thanks in advance.

    Tsarafidy.

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