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permanent magnet demagnetization

Posted 22.03.2010, 05:44 GMT-4 0 Replies

Arda Tüysüz
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Hi All,

I am using COMSOL AC/DC Module (Perpendicular Induction Currents, Vector Potential) to analyze a permanent magnet electrical machine. I have two questions regarding the permanent magnets:

1) Is there a difference in the way COMSOL solves the problem depending on whether the permanent magnets are modeled using the constitutive relation B=Mu0*MuR*H+Br or B=Mu0*H+Mu0*M ? I can not see a difference at the first glimpse and I'm not sure which one to use.

2) Is it possible to give COMSOL the demagnetization curve of the permanent magnets, or does it simply assume a linear demagnetization? Any tips on how to check the maximum machine current/field such that the permanent magnets are protected from irreversible demagnetization?

Thanks in advance!

Arda
0 Replies Last Post 22.03.2010, 05:44 GMT-4
COMSOL Moderator

Hello Arda Tüysüz

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