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radial magnetization for a PM

Posted 25 giu 2012, 22:05 GMT-4 Low-Frequency Electromagnetics Version 4.2 4 Replies

Jun Jiang
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Hi everybody,

somebody knows how to set the radial magnetization for a PM in 3D environment

Jiang
4 Replies Last Post 26 giu 2012, 22:38 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 26 giu 2012, 01:48 GMT-4
Hi

have you tried to define a coordinate system ? i.e. a cylindrical one

--
Good luck
Ivar
Hi have you tried to define a coordinate system ? i.e. a cylindrical one -- Good luck Ivar
Jun Jiang
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Posted: 1 decade ago 26 giu 2012, 03:31 GMT-4
Hi Ivar

Thank you for your good idea.
I have another question, i want to calculate the Lorentz force generated by the motion of a conductor (a copper rod in my case) in a constant magnetic field. However, i can only calculate the Lorentz force contribution (mef.FLtz) which is the actually the force density induced in the conductor. How can i calculate the exact force induced by the eddy current ?
My model is in the 2D axisymmetric environment.

Jiang
Hi Ivar Thank you for your good idea. I have another question, i want to calculate the Lorentz force generated by the motion of a conductor (a copper rod in my case) in a constant magnetic field. However, i can only calculate the Lorentz force contribution (mef.FLtz) which is the actually the force density induced in the conductor. How can i calculate the exact force induced by the eddy current ? My model is in the 2D axisymmetric environment. Jiang
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 26 giu 2012, 14:56 GMT-4
Hi

first if all in 2D-axi you can only have a Z motion, I believe, else I'm not sure how you get around the 2D-axi symmetry.

Then if you get a field density, which is the case for most variables, as these apply to each element dx*dy*dz (or dr*dphi*dz) it means you need to integrate over your domain or boundary, whatever applies, so that you get the total effect. (in 2D axi do not forget that sometimes you need the 2*pi*r "loop" multiplicant

--
Good luck
Ivar
Hi first if all in 2D-axi you can only have a Z motion, I believe, else I'm not sure how you get around the 2D-axi symmetry. Then if you get a field density, which is the case for most variables, as these apply to each element dx*dy*dz (or dr*dphi*dz) it means you need to integrate over your domain or boundary, whatever applies, so that you get the total effect. (in 2D axi do not forget that sometimes you need the 2*pi*r "loop" multiplicant -- Good luck Ivar
Jun Jiang
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Posted: 1 decade ago 26 giu 2012, 22:38 GMT-4
Hi Ivar

Thank you very much for your constructive advise.

Jiang
Hi Ivar Thank you very much for your constructive advise. Jiang

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