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How to simulate the secondary magnetic field generated by induced current

Posted 3 nov. 2011, 10:12 UTC−4 Low-Frequency Electromagnetics Version 4.2a 7 Replies

Zheng Wenpei
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Hi
In the coil_above_plate model, the current in the coil generates a primary magnetic field, and induces eddy current in the plate. How to simulate the secondary magnetic field generated by induced current?
Thanks!
7 Replies Last Post 12 juin 2012, 11:23 UTC−4
Edgar Kaiser
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Posted: 1 decade ago 4 nov. 2011, 04:44 UTC−4
Hi,

the induced field is of course calculated and superimposes with the primary field. If you want to see the induced field alone you could try to leave the plate away, or give it zero conductivity and subtract that from the full model.

Cheers
Edgar
Hi, the induced field is of course calculated and superimposes with the primary field. If you want to see the induced field alone you could try to leave the plate away, or give it zero conductivity and subtract that from the full model. Cheers Edgar
Zheng Wenpei
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Posted: 1 decade ago 4 nov. 2011, 09:10 UTC−4
Hi, Edgar

Thanks for your reply!
Is it possible to calculate the secondary magnetic field directly from a certain expression? I'd like to display the primary and secondary field at the same time.

Best wishes!
Zheng Wenpei
Hi, Edgar Thanks for your reply! Is it possible to calculate the secondary magnetic field directly from a certain expression? I'd like to display the primary and secondary field at the same time. Best wishes! Zheng Wenpei
Edgar Kaiser
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Posted: 1 decade ago 4 nov. 2011, 10:08 UTC−4
Wenpei,

no, I haven't seen that so far. Someone correct me please if I missed it.

Cheers
Edgar
Wenpei, no, I haven't seen that so far. Someone correct me please if I missed it. Cheers Edgar
Zheng Wenpei
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Posted: 1 decade ago 4 nov. 2011, 10:42 UTC−4
Edgar,

Someone had told me to Use the first part of Ampère's Law, as shown in the attachment, to build an expression of the secondary field. But I've no idea how to build the expression with the variables of COMSOL. May you could help me.

Best wishes!
Zheng Wenpei
Edgar, Someone had told me to Use the first part of Ampère's Law, as shown in the attachment, to build an expression of the secondary field. But I've no idea how to build the expression with the variables of COMSOL. May you could help me. Best wishes! Zheng Wenpei

Attachments:

Edgar Kaiser
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Posted: 1 decade ago 4 nov. 2011, 11:25 UTC−4
Wenpei,

I think what he means is to modify the application mode. You would need to modify the underlying differential equation. The term you marked is the only one that depends on the induced current j.

So, this not about postprocessing but rather about modifiying the application mode and its equations. This can of course be done, but I haven't done something like that so far.

Cheers
Edgar
Wenpei, I think what he means is to modify the application mode. You would need to modify the underlying differential equation. The term you marked is the only one that depends on the induced current j. So, this not about postprocessing but rather about modifiying the application mode and its equations. This can of course be done, but I haven't done something like that so far. Cheers Edgar
Zheng Wenpei
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Posted: 1 decade ago 4 nov. 2011, 12:16 UTC−4
Edgar,

Thanks a lot! Let me have a try.
By the way, I'd like to get an alternating magnetic field via a multi turn coil with a core in it in 3D mode, how could I build the geometry of the coil, and what kind of current should I choose to add on it?

Best wishes!
Zheng Wenpei
Edgar, Thanks a lot! Let me have a try. By the way, I'd like to get an alternating magnetic field via a multi turn coil with a core in it in 3D mode, how could I build the geometry of the coil, and what kind of current should I choose to add on it? Best wishes! Zheng Wenpei
ISMAEL GARCIA
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Posted: 1 decade ago 12 juin 2012, 11:23 UTC−4
Hi

I'm a begginer but, maybe you can create a new model and study.
In the new model add an "External current density" and put the induced currens solved in the previous problem.

Best wishes
Hi I'm a begginer but, maybe you can create a new model and study. In the new model add an "External current density" and put the induced currens solved in the previous problem. Best wishes

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