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
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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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