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# Re: AC & DC field question

- To: femm@yahoogroups.com
- Subject: Re: AC & DC field question
- From: "David Meeker" <dcm3c@earthlink.net>
- Date: Tue, 10 Sep 2002 16:08:26 -0000
- In-reply-to: <alj0rp+dkt3@eGroups.com>
- User-agent: eGroups-EW/0.82

    --- In femm@y..., "alanbabb" <alan@b...> wrote:
    > Is there a way to model the reslutant field of the AC field of a coil
    > and the DC field generated by a permanent magnet.
    >
    > I have the complete motor structure of a loudspeaker design in FEMM
    > but if I set the problem to have a frequency the permanent magnet
    > drops out. I am trying to model the effects of shorted turns both
    > inside and outside the voice coil in the magnetic gap.

    With femm, you can only evaluate the problem at one frequency at a
    time. That's why you can't see the PM (because it creates a DC field)
    when you do AC analysis.

    For what you want to you, you could use femm to identify flux linkages
    between your coil and the shorted turns using a series of DC analyses.
    You can then use these flux linkages as part of a circuit
    representation of your device, which you would have to build
    independently of femm.

    Dave.

- References:
  - AC & DC field question
    - From: "alanbabb" <alan@babbspeakers.com>

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