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# Re: [femm] Linear induction motors

- To: <femm@egroups.com>
- Subject: Re: [femm] Linear induction motors
- From: "Eckart Nipp" <eckart.nipp@m-v-l.de>
- Date: Mon, 31 Jul 2000 09:49:34 +0200
- Reply-to: "Eckart Nipp" <Eckart.Nipp@m-v-l.de>

    Hello,

    just some thoughts concerning the saturation problem mentioned.

    A flux density of 3T and higher in machine steel sheets is
    actually not impossible if only the field strength H is high
    enough. Such flux densities occur for instance in the cores of
    magnetizing devices for rare earth magnets.

    An easily made mistake that can lead to irrealistic saturation
    levels is mixing dimensions like inch vs. mm. Also the currents
    should be checked if there is not a dimension error. That happens
    easily when you alter the number of turns, the interconnection of
    coils, the number of slots per pole and phase, or such.

    Concerning the magnetization curve, adding a point at very high
    magnetic field strength is a good idea. I use that since many
    years in various programs. However, consider that the slope above
    the already given curve tip should be similar to that of air, not
    the absolute permeability of this additional point. Furthermore it
    was found that the differential relative permeability of steel is
    larger than unity even at very high saturation levels. It may thus
    be more realistic to compute this extra point with a slope of a
    relative permeability of e.g. 5.

    Greetings
    Eckart

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