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Modeling ETD ferrite core

Posted 25 août 2014, 12:18 UTC−4 Low-Frequency Electromagnetics, Studies & Solvers Version 4.3b 2 Replies

Keijo Jacobs
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I am trying to model an ETD ferrite core (core losses) and i have been following the tutorial for an E core. (www.comsol.se/model/download/157243/models.acdc.ecore_transformer.pdf)

However i experience a problem with the solver. Error message:

Nonlinear solver did not converge.
In segregated group 2:
Time : 0
Internal error in solver.
Last time step is not converged.

The file is attached. Any idea how to fix this?
Thank's very much in advance.

PS: I know i could make an approximation and simulate the core in 2d, but i want to compare with a more complex transformer, that needs 3d simulation

Attachments:

2 Replies Last Post 28 août 2014, 05:00 UTC−4
Dima Apter
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Posted: 1 decade ago 26 août 2014, 01:30 UTC−4
Dear Keijo,

I guess you need to add "Coil Current Calculation" steps (one step for each coil) to your solver sequence, before the "Time Dependent" step. "Coil Current Calculation" is required for Numeric coils. Also the Time Dependent solver parameters should me modified.
Everything is mentioned in the pdf you refer to. See the modified model, seems that it converges.

Best Regards,
Dima.

--
Dima Apter
www.a2z-consulting.com
Dear Keijo, I guess you need to add "Coil Current Calculation" steps (one step for each coil) to your solver sequence, before the "Time Dependent" step. "Coil Current Calculation" is required for Numeric coils. Also the Time Dependent solver parameters should me modified. Everything is mentioned in the pdf you refer to. See the modified model, seems that it converges. Best Regards, Dima. -- Dima Apter www.a2z-consulting.com
Keijo Jacobs
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Posted: 1 decade ago 28 août 2014, 05:00 UTC−4
Thx Dima,

for some reason the "Coil Current Calculation" was shown grayed out. Can't reproduce it, though. I worked it through again and it works fine.

best regards

Keijo
Thx Dima, for some reason the "Coil Current Calculation" was shown grayed out. Can't reproduce it, though. I worked it through again and it works fine. best regards Keijo

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