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Simulating the magnetic field distribution around current carrying traces
Posted Jun 23, 2018, 4:58 p.m. EDT Low-Frequency Electromagnetics Version 5.3a 0 Replies
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Dear COMSOL community,
I just started to work with the software a few months ago for my Master's thesis and the last few weeks I am stuck due to several problem. My goal is to simulate the magnetic field distribution around x parallel traces to search for a proper placement for a AMR.
To become used with the software I started simulating the case in 2D with two parallel traces made from copper and surrounded by air with an applied external current density such that a current of 20A flows. In the .pdf file, I attached, there are the results from COMSOL. At higher frequencies >10kHz the skin effect is visible, but I think the COMSOL results must be wrong, because the max. value of the magnetic field is decreasing. In my understanding it should increase with increasing frequency. Thus is compared COMSOL to FEMM simulations and them seem to make more sense. So, the first question is:
- Has anyone any idea what might be my mistake? How can I change the COMSOL simulation to get more realistic results?
Moreover, I extended the simulations to 3D and since the applied external current density did not work well, I decided to use Lumped Ports as current input.
- Is this a proper choice or are there better opportunities to make a current run through the copper traces?
Using 3D I have the problem that the simulations always converges below about 100kHz.
- Does anyone know why the simulation always converge once the frequencies come below about 100kHz?
The final problem is related to the traces height. Once I decrease the height into the um range, the simulations always converge, too.
- Does anyone know how to fix this issue?
I am looking forward to your replies. If you want to send me a mail, usw alauer2@uncc.edu I hope there is someone out there who can help me!
Best wishes, Andreas Lauer
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Hello Andreas Lauer
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