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Simulating a toroidal B-field inside a magnetic focusing horn
Posted Apr 18, 2020, 10:46 a.m. EDT Low-Frequency Electromagnetics Version 5.4 2 Replies
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Dear COMSOLers,
I am trying to study the magnetic field map produced inside a magentic horn (geometry photos and simplefied model attached). The current is flowing in the r-z-plane rather than azimutally (i.e. in phi), hence the field inside is a toroidal field along the phi-plane. I am defining the physics conditions through "Magnetic Field" module. Under "coil -> Geometry Analysis" I define the current input port. However, I am facing the follwoing problems: 1- When I add the surrounding Air domain, I am not able to define the current output port anymore, why? 2- I am getting the follwoing error message when try to solve my model "Numeric coil Coil 1 (coil1) not solved for. Solve it in a Coil Geometry Analysis step.", what dose it mean? 3- What I am missing in the model to make it running?
Regards, Tamer
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Your "coil" does not seem to be defined as a closed circuit, see blog post linked to below.
https://uk.comsol.com/blogs/modeling-coils-in-the-acdc-module/
Once you have defined your coil appropriately, you can add a coil geometry analysis step to your solution, (right click your study, choose Study Step - Other - Coil Geometry Analysis. Then drag this study step above your stationary step.
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Thanks a lot MortalWombat. It works now perfect.
Just to conclude this case efficientley for the others/for future, I am attaching the working model.
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