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# Rif: [femm] torque computation

- To: femm@yahoogroups.com
- Subject: Rif: [femm] torque computation
- From: giovanni.bortolan@sogagroup.com
- Date: Fri, 18 Jan 2002 08:46:49 +0100

    To achieve a better approximation in non-linear harmonic computation I
    perform two steps.
    1- Run at frequency 0 and verify mur in the main areas (yokes, tooths)
    and establish a mean value (generall between 50 and 300),
    2- Insert this new mur in material's properties, open small saturated
    area (as David suggested) and re-run at your frequency.
    If saturation is very different between areas, two or more different
    marerials may be used with the same B-H curve, but with different mur.
    Anyway it remains an approximation, and only a test can allow you to know
    how far your risult is from reality.

    bye
    _______________________________
    ing. G.Bortolan

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    "Diego Perez
    Lara" Per: "David Meeker, Ph.D." <dmeeker@foster-miller.com>,
    <diego.perez.lar <femm@yahoogroups.com>
    @terra.es> Cc:
    Oggetto: [femm] torque computation
    17/01/2002 20:13
    Per favore,
    rispondere a
    femm

    Dear all,

    I have some problems calculating torque of an induction motor. When i'm doing a harmonic
    analisys, femm doesn't take into account B-H curve and i put a linear mu, but i can't
    achieve a valid result. i'm simulating a quarter of the motor but if i rise up mu, induction
    is huge. Do you have any clue to solve problem?
    i'm calculating torque from stress maxwell's tensor across a centered curve round the airgap
    with a fine mesh in it.

    Thank you

    Diego Pérez

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