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# Re: [femm] Linear induction motors

- To: femm@egroups.com
- Subject: Re: [femm] Linear induction motors
- From: Dave Squires <djsquires@plix.com>
- Date: Sat, 05 Aug 2000 23:19:12 -0700
- References: <39843E1B.23696.522593D@localhost>

    Just to set the record straight. I did not write the FEMM program.
    It was written by David Meeker. Just want to prevent confusion.
    And I am no expert in using FEMM either. I have learned quite a bit
    and can do some things, but that is far from "expert" level.

    Dave Squires

    Jose Roberto Camacho wrote:

    > To: femm@egroups.com
    > From: Dave Squires <djsquires@plix.com>
    > Date sent: Sun, 30 Jul 2000 09:39:31 -0700
    > Send reply to: femm@egroups.com
    > 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
    > >
    > Dear Dave,
    > Actually, I have a Doctoral student that is doing that work. We are
    > starting with the saturation right this moment. The thing is, we
    > made a double face linear induction motor, based on an ordinary
    > induction motor. So, we have the machine working at our lab but
    > we had no idea about saturation aspects. The question was: Are
    > we making an optimized linear induction motor? Probably not, so
    > we decided to use your program to see the saturation level. The
    > machine is working with no load at all, the load is only a flat
    > aluminum disk around 1 cm thick. Propelling the disk the motor
    > current was very small and as your program has proved there was
    > no saturation. We are now increasing the motor current, and we
    > decided to use the Iron-Si 4% magnetization curve. Which is the
    > closest material to our Iron-Si armature. I do not have an answer
    > about the FEMM performance yet, but as soon as I got them, you
    > be sure that I will exchange my experiences with the FEMM
    > comunity.
    > Concerning Gabrielle's idea, I think it is worth to have a good look
    > on it, and this could be a simulation limitation, but this can only be
    > answered with a thorough look at the source code.
    >
    > Many thanks for you attention to my query. I certainly will have
    > many questions to ask you about your program.
    >
    > With my sincere regards,
    >
    > Dr. J.R. Camacho - IEEE Member: 01981539
    > UFU - School of Electrical Engineering - P.O. Box: 593
    > Phone:+55.34.239.4166/250 - Fax: +55.34.236.9530
    > 38400.902 - Uberlandia - MG - Brazil
    >
    >

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    - From: "Jose Roberto Camacho" <jrcamacho@ufu.br>

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