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# Re: [femm] what frequency range can FEMM be used in?

- To: femm@yahoogroups.com
- Subject: Re: [femm] what frequency range can FEMM be used in?
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Thu, 31 May 2001 11:25:26 -0400
- Organization: Foster-Miller, Inc.
- References: <27553.991244994@www16.gmx.net>

    corneliuspaul@gmx.de wrote:

    > the only reason i need an electromagnetic field FEM software right now is
    > that i
    > have to do a research on different concepts for a high voltage transformer.
    > the device will be operated at 50kHz, maybe later the frequency range will
    > be extended to about 200kHz.
    > i need to compute the following parameters:
    > - main and leakage inductance (good accuracy needed)
    > - rms, skin and proximity losses (average accuracy needed)
    > - core losses (average accuracy needed)
    > (sinusoidal currents will do fine as a first approach, arbitrary current
    > waveforms would be great.)
    >
    > the manual says the FEMM software is to be used for "low frequency
    > applications" but i have not found what frequency range is meant
    > by "low"
    >
    > so my question to the experienced group is:
    > is the FEMM package suitable for the given frequency range and needed
    > computations?
    >

    "Low frequency" means problems that can be described by a diffusion equation
    rather than by a wave equation. There are some metrics that you can look
    at--basically the wavelength at the frequency of interest must be much longer
    than some characteristic lengths of your problem. For some details, check out
    http://web.mit.edu/6.013_book/www/chapter15/15.3.html. At the frequencies that
    you are looking at in a transformer-sized domain, the low-frequency formulation
    ought to be ok.

    Dave Meeker

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    org:Foster-Miller, Inc.;Electrical and Electronic Systems Group
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    title:Senior Engineer
    adr;quoted-printable:;;350 Second Avenue=0D=0A;Waltham;MA;02451-1196;USA
    fn:David Meeker, Ph.D.
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- References:
  - what frequency range can FEMM be used in?
    - From: corneliuspaul@gmx.de

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