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# Re: [femm] Linear induction motors

- To: femm@egroups.com
- Subject: Re: [femm] Linear induction motors
- From: dcm3c@aol.com
- Date: Sun, 30 Jul 2000 13:49:11 EDT

    In a message dated 7/30/00 1:14:54 PM Eastern Daylight Time,
    g.bellussi@ciaoweb.it writes:

    > My name is Gabriele and I'm a student in electrical engineering at the
    > Politecnico of Turin. Well, I've used FEMM to study electromagnets and I've
    > had the same problem. I solved it by adding a point at the end of the
    > magnetic caracteristic with a slope equal to the air permeability. Perhaps
    > when you attempt to solve your problem, you find a magnetomotive force that
    > is greater than the greatest value in your magnetic characteristic, so FEMM
    > calculates the induction value by appling the slope of the last two points
    of
    > your table.

    Yes, Gabriele has it right--the program interpolates linearly off the end of
    the defined B-H curve. If you really want to work in "deep" saturation, you
    have to define the B-H curve out until things really get to unit relative
    permeability. However, the best bet in terms of making sure that the program
    does what you intend is to define points so that the B-H curve is always
    interpolated between datapoints, rather than extrapolated.

    Dave.

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