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Modelling high frequency choke with air gap 2D model with multi-turn coils groups - inductance problem

Posted 10 ott 2013, 10:56 GMT-4 Low-Frequency Electromagnetics Version 4.3b 0 Replies

Mateusz Frydrych
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Hello, it's my first topic at this forum and I am beginner at using Comsol, so forgive me any of my stupid questions.

Firstly I would like to explain what I am trying to achieve doing my simulations. My model has 2 multi-turn coils with the same number of turns, they are wounded at symmetric ferromagnetic core with air gap(attachment included). Coils are supposed to be connected as differentially coupled series inductors, with two capacitors connected in parallel. To achieve this I added Magnetic Fields and Electrical Circuit models. I assume that electrical circuit is correctly connected to magnetic fields model.
Frequency of my AC source is 5kHz.
My aim is to obtain inductance of each coils and mutual inductance to compute coupling factor between the coils. To do this I've tried to compute coils inductance by frequency domain study and here has appeared big problem, inductance of first coil is negative... which I suppose isn't correct value. I've tried to find any reasonable explanation to this, but nothing came to my mind, I'm in a tight spot because of this.

I would be grateful for your advice. maybe my model is bad and has some errors, if you find anything, please notice me at this thread.

My model is available to download from my dropbox account - it has to big size to upload it to forum server - www.dropbox.com/s/yl9ip9r5pzhg2z9/2D%20choke%20air%20gap.mph

Regards, Mateusz.
0 Replies Last Post 10 ott 2013, 10:56 GMT-4
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Hello Mateusz Frydrych

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