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# Transient Magnetic Field Analysis

- To: femm@yahoogroups.com
- Subject: Transient Magnetic Field Analysis
- From: "mjcraft78" <mjcraft78@yahoo.com>
- Date: Mon, 02 Jun 2003 22:25:21 -0000
- User-agent: eGroups-EW/0.82

    I am attempting to model the magnetic field of an electromagnet with a
    step input of current to the coil (this is an axisymmetric problem).
    I understand that FEMM can model the effect of eddy currents &
    hysteretic losses on a "magnetic circuit" for a given frequency, but
    currently does not have the capability of modeling a DC bias. Is
    there some way that I could correlate the AC response at several
    different frequencies to predict the behavior for a step input?
    Additionally, I've used FEMM to calculate the inductance of the
    circuit, but I'm guessing that this does not take into account the
    generation of eddy currents due the rate of change of the field?
    Please let me know if I'm way off here or what I can do to model this
    problem accurately.

    Thanks for your help,

    Mike Craft

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