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Problem with solving AC/DC Module with soft iron in frequency domain

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Hello,

I have a weird problem that I can't find a solution to and I really appreciate your help with this matter.

I have a simple 2D model of two coils with opposite currents. The coils are surrounded by an iron core with non-linear permeability (BH curve). I am trying to get the magnetic field distribution for 60Hz currents.

I added a new ampere's law for the iron and selected BH curve.

When I solve stationary, I get a solution.
When I solve with linear permeability I get a solution.
But when I solve in frequency domain I get no solution with the following error:

Failed to find a solution.
Maximum number of Newton iterations reached.
Returned solution is not converged.

I have attached a picture of my model and would really appreciate your help with it.


1 Reply Last Post 07.03.2013, 00:49 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 07.03.2013, 00:49 GMT-5
Hi

how are the current flowing, for me in 2D its not a "coil" but a wire and your current is flowing in the Z direction out of plane. For me the coil physics is for a current doing a loop IN the plane. You should "just" define surface currents, in my view

--
Good luck
Ivar
Hi how are the current flowing, for me in 2D its not a "coil" but a wire and your current is flowing in the Z direction out of plane. For me the coil physics is for a current doing a loop IN the plane. You should "just" define surface currents, in my view -- Good luck Ivar

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