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AC/DC , Single / Multi-turn / Group coil domains !

Posted Jan 17, 2014, 12:15 a.m. EST Low-Frequency Electromagnetics Version 4.4 3 Replies

Dwekat
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Dear COMSOLer's !

I am relatively new to COMSOL and i am still trying to get things understood right , i still have a lot of questions and i will be really grateful if someone could help !

what is the difference between single , multi, or coil group domain ?
why i cant do each coil as a single turn ?! how COMSOL treat coil physics ?
and what if i need to charge the coil from an external circuit ? which turn is the input and which is output ?


i will be really grateful if any could help
3 Replies Last Post Jun 26, 2014, 1:58 a.m. EDT
Lingling Tang
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Posted: 1 decade ago Jan 19, 2014, 7:12 a.m. EST
www.comsol.com/models/acdc-module
some models will be helpful.
http://www.comsol.com/models/acdc-module some models will be helpful.
Dwekat
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Posted: 1 decade ago Jun 25, 2014, 8:06 a.m. EDT
that was really helpful
thank you so much for your reply.

i still have some issues with coils ! i am trying to simulate a 10 turns spiral coil in 2D ( not Axisymmetric )
i built 10 separated rectangles to represents the coil turns. Now , five of them should have reversed current direction which i managed to do using the Single- Turn Coil options. However, i still didn't get how the " Coil group " check box functions ? and after checking the box i have this option of " Domain Group " ! . the Help information was really shallow and i couldn't get the deference !
So ; it will be really great if you can explain more about these features in COMSOL 4.4

Coil group ?
Domain Group ?
and is there any deference in such cases between 2D and 2D Axisymmetric ?
what i should use for my case ?
a picture is attached for more understanding

Best Regards ;
that was really helpful thank you so much for your reply. i still have some issues with coils ! i am trying to simulate a 10 turns spiral coil in 2D ( not Axisymmetric ) i built 10 separated rectangles to represents the coil turns. Now , five of them should have reversed current direction which i managed to do using the Single- Turn Coil options. However, i still didn't get how the " Coil group " check box functions ? and after checking the box i have this option of " Domain Group " ! . the Help information was really shallow and i couldn't get the deference ! So ; it will be really great if you can explain more about these features in COMSOL 4.4 Coil group ? Domain Group ? and is there any deference in such cases between 2D and 2D Axisymmetric ? what i should use for my case ? a picture is attached for more understanding Best Regards ;

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Jens Krause
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Posted: 1 decade ago Jun 26, 2014, 1:58 a.m. EDT
Hi,

say for simplicity there a two rectangles representing this coil.

If you uncheck "coil group" the two rectangles will be treated as one
solid piece of conductor. In a way you can say the two wires are in parallel and
the voltage drop over the rectangles is equal.

If you check "coil group" then the wires are connected in series and the
total current over the rectangles are equal.

The "domain group" now lets you mix parallel and series connection, but
I have not yet used this myself.

Regards

Jens
Hi, say for simplicity there a two rectangles representing this coil. If you uncheck "coil group" the two rectangles will be treated as one solid piece of conductor. In a way you can say the two wires are in parallel and the voltage drop over the rectangles is equal. If you check "coil group" then the wires are connected in series and the total current over the rectangles are equal. The "domain group" now lets you mix parallel and series connection, but I have not yet used this myself. Regards Jens

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