I was trying to model the coupling of two single turn coils in Comsol 5.0 in 3D. this is same as the model in 2D presented in the model library of comsol which is named mutual-inductance. if you couldn't find it there probably you will find it online.
I generated two toroids (closed loops) as two single coil turn domains. they are partitioned by a plane to create internal boundaries for gap feeding. one is driven by 1 [A] and the current through the other one is set to zero in order to monitor the voltage induced in coil. MF physics was used and a frequency domain step was generated. The problem is solved by direct stationary solver but it failed to converge.." Failed to find a solution. The relative error is greater than the relative tolerance".
It should be noted that I need to resolve the current distribution in the coil. since my objective is to use these steps for a more complex geometry, I would like to model it in 3D. Also, I cant use the impedance boundary condition since the skin depth is roughly equal to wire radius.
I really appreciate if anyone could take a look and leave me a comment if somewhere I am making mistake.
Hi Ehsan,
I have used an older versions comsols, but I think the principle is not much big difference, also, the frequency range try to make it discrete means that solve on several quantized ranges not whole range in order to avoid some nonlinearities which may not unresolvable with the assigned parameters.
try to increase the tolerance limit and/ or the number of iterations also try to choose either nonlinear solver or Automatic solver
Hello Ahmed,
From what I understood in your message, you are talking about frequency spectrum (Please correct me if I am wrong). In my model, I am using a single frequency for exciting one coil and the other one is just considered as a receiver, so, I am working at a single frequency.
About the solver, I should mention that the discrepancy between the error and tolerance is too high which means that there is a problem in boundary condition setup. But, I wish that I knew which condition is defined wrongly!!
Here I attached an image from the comsol screen, since I understood you don't have comsol anymore. Hope you could find time to take a look.
I recommend contacting the technical support team @COMSOL Multiphysics to help answer any COMSOL related questions http://www.comsol.com/support. Their team of experts will guide you through the modeling process.
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