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# Cogging torque

- To: femm@yahoogroups.com
- Subject: Cogging torque
- From: robin.cornelius@hirst-magnetics.com
- Date: Sun, 25 Nov 2001 15:15:27 -0000
- User-agent: eGroups-EW/0.82

    Dear group,

    I am trying to calculate the cogging torque for a brushless rotor,
    but I am having some fundimental problems (this is not my area of
    expertiese !).

    What intergral should i look at ? . I have tried a line intergral
    around the air gap between stator and rotor (with a reasonable dense
    mesh) and looked at the torque from stress tensor. (I am then steping
    the rotor around to see the value at different pole pitches).But the
    magnitude of the results is too large and the pitch/value graph is
    not quite what i would expect. I remember that David M. mentioned
    coenergy in a past email in relation to cogging torque? if this is
    good to use over what areas should this be evaluated (iron,air,magnet
    all?)

    Any advice greatly appreicated.

    Robin Cornelius

    robin.cornelius@hirst-magnetics.com

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