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# Re: Rif: [femm] torque computation

- To: <femm@yahoogroups.com>
- Subject: Re: Rif: [femm] torque computation
- From: "Diego Perez Lara" <diego.perez.lar@terra.es>
- Date: Fri, 18 Jan 2002 15:49:19 +0100 (Hora estándar romance)
- References: <OF7DE3838D.849496F8-ONC1256B45.0029090E@sogagroup.com>

    Thanks Giovanni,

    i'll try this¡¡

    Diego Pérez

    -------Original Message-------

    From: femm@yahoogroups.com

    Date: viernes, 18 de enero de 2002 15:35:51

    To: femm@yahoogroups.com

    Subject: Rif: [femm] torque computation

    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

    Sincro srl

    via Tezze, 3 loc. Cereda

    36073 Cornedo Vicentino (VI)

    Tel: (++39) 0445 450 500

    Fax: (++39) 0445 446 222

    e-mail: Giovanni.Bortolan@sogagroup.com

    tecnico.sincro@sogagroup.com

    REA 194515/VI

    Reg. Imp. 20968/VI 116

    P.IVA 01925820241

    "Diego Perez

    Lara" Per: "David Meeker, Ph.D." &lt;dmeeker@foster-miller.com>,

    <diego.perez.lar &lt;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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    >
    <DIV>Thanks Giovanni,</DIV>
    <DIV>i'll try this¡¡</DIV>
    <DIV>&nbsp;</DIV>
    <DIV>Diego Pérez</DIV>
    <DIV>&nbsp;</DIV>
    <DIV id=IncrediOriginalMessage><I>-------Original Message-------</I></DIV>
    <DIV>&nbsp;</DIV>
    <DIV id=receivestrings>
    <DIV dir=ltr style="FONT-SIZE: 11pt" <i><B>From:</B></I> <A
    href="mailto:femm@yahoogroups.com";>femm@yahoogroups.com</A></DIV>
    <DIV dir=ltr style="FONT-SIZE: 11pt" <i><B>Date:</B></I> viernes,18 de
    enero de 2002 15:35:51</DIV>
    <DIV dir=ltr style="FONT-SIZE: 11pt" <i><B>To:</B></I> <A
    href="mailto:femm@yahoogroups.com";>femm@yahoogroups.com</A></DIV>
    <DIV dir=ltr style="FONT-SIZE: 11pt" <i><B>Subject:</B></I> Rif: [femm]
    torque computation</DIV></DIV>
    <DIV>&nbsp;</DIV><BR>To achieve a better approximation in non-linear
    harmonic computation I<BR>perform two steps.<BR>1- Run at frequency 0and
    verify mur in the main areas (yokes, tooths)<BR>and establish a mean value
    (generall between 50 and 300),<BR>2- Insert this new mur in material's
    properties, open small saturated<BR>area (as David suggested) and re-run
    at your frequency.<BR>If saturation is very different between areas, two
    or more different<BR>marerials may be used with the same B-H curve, but
    with different mur.<BR>Anyway it remains an approximation, and only atest
    can allow you to know<BR>how far your risult is from
    reality.<BR><BR>bye<BR>_______________________________<BR>ing.
    G.Bortolan<BR><BR>Sincro srl<BR>via Tezze, 3 loc. Cereda<BR>36073 Cornedo
    Vicentino (VI)<BR>Tel: (++39) 0445 450 500<BR>Fax: (++39) 0445 446
    222<BR>e-mail: <A
    href="mailto:Giovanni.Bortolan@sogagroup.com";>Giovanni.Bortolan@sogagroup.com</A><BR><A
    href="mailto:tecnico.sincro@sogagroup.com";>tecnico.sincro@sogagroup.com</A><BR><BR>REA
    194515/VI<BR>Reg. Imp. 20968/VI 116<BR>P.IVA
    01925820241<BR><BR><BR><BR><BR>"Diego Perez <BR>Lara" Per: "David Meeker,
    Ph.D." &amp;<A
    href="mailto:lt;dmeeker@foster-miller.com";>lt;dmeeker@foster-miller.com</A>&gt;,
    <BR>&lt;diego.perez.lar &amp;<A
    href="mailto:lt;femm@yahoogroups.com";>lt;femm@yahoogroups.com</A>&gt;
    <BR><A href="mailto:@terra.es";>@terra.es</A>&gt; Cc: <BR>Oggetto: [femm]
    torque computation <BR>17/01/2002 20:13 <BR>Per favore, <BR>rispondere a
    <BR>femm <BR><BR><BR><BR><BR><BR><BR>Dear all, <BR><BR>I have some
    problems calculating torque of an induction motor. When i'm doing a
    harmonic <BR>analisys, femm doesn't take into account B-H curve and iput
    a linear mu, but i can't <BR>achieve a valid result. i'm simulating a
    quarter of the motor but if i rise up mu, induction <BR>is huge. Do you
    have any clue to solve problem? <BR>i'm calculating torque from stress
    maxwell's tensor across a centered curve round the airgap <BR>with a fine
    mesh in it. <BR><BR>Thank you <BR><BR>Diego Pérez
    <BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR>____________________________________________________<BR>(Embedded
    image moved to file: pic00041.gif) IncrediMail - Email has<BR>finally
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    - From: giovanni.bortolan@sogagroup.com

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