Hysteresis in a magnetic circuit

[Gilles]

Hello everyone,

Is there a possibility to add hysteresis to a H-B curve.
I searched everywhere and found a discussion on this topic in 2017. At that time it didn't exist. Is it always the same?

In the definition of the material of steel I indicated

Code: Select all

Material 2
  Name = "iron"
  Relative Permeability = 100        !  µr  valeur FEMM 100 or 5000 
  Magnetic Permeability =1.26e-4
  Electric Conductivity = 1e7  
  H-B Curve = Variable "nonlin"
  Real Cubic Monotone
    include Acier2.txt
    End
End

but not hysteresis. I would have liked to check my assembly in frequency.

I wanted to add in these lines my thanks to Elmer's contributors. We did the calculations without being able to know the iron losses. We are going full size in our study project, it was a lot of risk. After the calculations, we had to modify the dimensions of the initial plans. Normally it's good, we move on to the prototype phase. Thanks a lot for your help.

[raback]

Hi

There is a Zirka model for 2D only. I found these tests for it:

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Zirka/case.sif:  zirka material = logical true
circuits2D_with_hysteresis_axi/sif/37.sif:   zirka material = logical true
circuits2D_with_hysteresis/sif/37.sif:   zirka material = logical true

Great that Elmer could help you!

-Peter

[raback]

Hi,

Additionally, you can use Steinmetz formula to model hysteresis losses a posteriori. The Zirka model is the only one that can take into account hysteresis properly but it is more experimental. The Steinmetz losses have been verified and found to be very close to those given by Ansys & Comsol.

For Ansys comparison see: https://github.com/ElmerCSC/elmer-elmag ... tMachine2D

This is applicable to both 2D and 3D. Accurate results require rather fine time-stepping since Fourier transform is done on-the-fly.

-Peter

[Gilles]

Thank you very much Peter,

[Gilles]

Hello Peter,

I looked for an example with Zurka, but I couldn't find it.
I can't find the directories you indicate.
Sorry to disturb you.

Best regards
Gilles

Code: Select all

Zirka/case.sif:  zirka material = logical true
circuits2D_with_hysteresis_axi/sif/37.sif:   zirka material = logical true
circuits2D_with_hysteresis/sif/37.sif:   zirka material = logical true

[raback]

Tests are here:
https://github.com/ElmerCSC/elmerfem/tr ... /fem/tests

[Gilles]

Thank you so much!