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# Re: four values for Maxwell force??

- To: femm@yahoogroups.com
- Subject: Re: four values for Maxwell force??
- From: "David Meeker" <dmeeker@ieee.org>
- Date: Fri, 26 Sep 2003 13:48:08 -0000
- In-reply-to: <bkto4v+9p7r@eGroups.com>
- User-agent: eGroups-EW/0.82

    --- In femm@yahoogroups.com, "ahmad_m_eid" <ahmad_m_eid@y...> wrote:
    > Dear all
    >
    > I have a small problem, I think it is discussed before.
    > When I calculate the force by line integral of maxwell stress tensor,
    > I get four values for it { 0 0 values3 0}
    > although I use magnetostatic problems (frequency = 0)
    > this "values3" in the table of line integral corresponds to(page 52):
    > 3 Stress Tensor Force DC r/x force DC y/z force 2x r/x
    > force 2x y/z force.
    >
    > So, I get "2x r/x force" although I use axisymmetric problems i.e.
    > force in z-direction only.
    >
    > 1- I need an explanations for my problem.
    > 2- What does 2x force mean? i.e. the required force will be this value
    > or divided by 2?
    >
    > any explanation is welcomed.
    >
    > ahmad

    Each of these entries is potentially a complex value, so the first two
    results are "DC r/x force", the third and fourth are real and
    imaginagry for "DC y/z force", and so on. Since you have a
    magnetostatic, axisymmetric problem, the only non-zero component is
    the real part of the z-directed force, which is the third value
    returned from the call. The "2x" forces are for AC problems, where
    you get forces that are a combination of a DC force and a force at
    twice the drive frequency.

    Dave.
    --
    David Meeker
    dmeeker@ieee.org

- References:
  - four values for Maxwell force??
    - From: "ahmad_m_eid" <ahmad_m_eid@yahoo.com>

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