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Failure in modelling magnetic field of a current carry wire
Posted Nov 5, 2015, 4:25 p.m. EST Low-Frequency Electromagnetics Version 5.1 3 Replies
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Hi all,
I am new to Multiphysics and now trying to model a magnetic field of a current carrying wire with a limited length. So I used a cylinder to simulate copper wire. I made two attempts where I used a cylinder and a sphere to simulate surrounding air. However, I got totally different results and these results are all different from theoretical values.
I could not come up with solutions to this problem. Please find the attached files and make some suggestions.
Thank you very much
Kind regards
Junjie Tu
I am new to Multiphysics and now trying to model a magnetic field of a current carrying wire with a limited length. So I used a cylinder to simulate copper wire. I made two attempts where I used a cylinder and a sphere to simulate surrounding air. However, I got totally different results and these results are all different from theoretical values.
I could not come up with solutions to this problem. Please find the attached files and make some suggestions.
Thank you very much
Kind regards
Junjie Tu
Attachments:
3 Replies Last Post Nov 9, 2015, 8:45 a.m. EST
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Posted:
9 years ago
Hi,
It is not possible to model a finite length of a current carrying coil by terminating the conductor in the air region. You must have a close loop or extending to touch the outer boundary (magnetic insulation boundary) which acts as a return current path.
For more information about this refer to the following blog post:
www.comsol.com/blogs/computing-the-inductance-of-a-wire/
Best Regards,
Nirmal
It is not possible to model a finite length of a current carrying coil by terminating the conductor in the air region. You must have a close loop or extending to touch the outer boundary (magnetic insulation boundary) which acts as a return current path.
For more information about this refer to the following blog post:
www.comsol.com/blogs/computing-the-inductance-of-a-wire/
Best Regards,
Nirmal
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Posted:
9 years ago
Hi,
Thank you for your reply.
I read the web page you provided and added magnetic and electric field interface to my modelling, but I couldn't find terminal and ground boundary condition in this interface. So should I include electric current too? I failed to calculate magnetic field by applying current in electric current interface. Is it because I didn't couple this two interface? If it's so, can you please tell me how to do this?
Many thanks
Junjie Tu
Thank you for your reply.
I read the web page you provided and added magnetic and electric field interface to my modelling, but I couldn't find terminal and ground boundary condition in this interface. So should I include electric current too? I failed to calculate magnetic field by applying current in electric current interface. Is it because I didn't couple this two interface? If it's so, can you please tell me how to do this?
Many thanks
Junjie Tu
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Posted:
9 years ago
Hi,
The "Terminal" and "Ground" boundary features are available under "Magnetic and Electric Fields -> Magnetic Insulation 1" in MEF physics interface.
See the following example:
www.comsol.com/model/inductance-of-a-power-inductor-1250
Best Regards,
Nirmal Paudel
The "Terminal" and "Ground" boundary features are available under "Magnetic and Electric Fields -> Magnetic Insulation 1" in MEF physics interface.
See the following example:
www.comsol.com/model/inductance-of-a-power-inductor-1250
Best Regards,
Nirmal Paudel