RE: [femm] Linear induction motors

[<g.bellussi@xxxxxxxxxx>]

Hello,

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 hadthe same problem. I solved it by adding a point at the end of the magneticcaracteristic with a slope equal to the air permeability. Perhaps when youattempt 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.

I hope I've helped you.

Bye.




-----Original Message-----
From:	"Dave Squires" <djsquires@xxxxxxxx>
Sent:	Sunday, July 30, 2000 6:39 PM
To:	"femm@xxxxxxxxxxx" <femm@xxxxxxxxxxx>
Subject:	Re: [femm] Linear induction motors

Dr Camacho,
I wonder if you have seen the same thing as I have with FEMM.
It "appears" that magnetic saturation levels are not observed in
the results. For example: silicon core iron as supplied in the
installation of FEMM should saturate at about 2 Tesla, but will
happily show 3 or 4 tesla or more of magnetic flux flowing
through a core. This is obviously not correct. Have you found
a way around this or is it just a simulator limitation? Or is is
that your simulations do not approach magnetic saturation so that
you don't see the problem. My workaround is to increase cross
section so that the flux density goes below the "known" saturation
level.

Thanks,
Dave Squires

jrcamacho@xxxxxx wrote:

> Hi all,
> I am posting this message to all people interested in femm applyed to
> electrical machines. I am currently using "FEMM" to optimize the
> design of linear induction motors. If anyone is interested in similar
> work I will be glad to share ideas and the work that has been
> developed here.
>
> With my sincere regards and thanks in advance for your attention.
>
> Dr. J.R. Camacho
> School of Electrical and Electronic Engineering
> Universidade Federal de Uberlandia
> Uberlandia - Minas Gerais State - Brazil
>
>