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Hysteresis curve

Posted Feb 24, 2010, 9:06 a.m. EST 6 Replies

Cesar Camerini
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Hi all,


There is a way I can load a hysteresis curve for a specific material? If yes, how can I do that?


Cesar Camerini
6 Replies Last Post Feb 26, 2010, 11:52 a.m. EST
Lidia Campa
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Posted: 1 decade ago Feb 24, 2010, 11:08 a.m. EST
Hi,

The way I know is by creating a new material. There you can define B, H and MUR as functions, trhough an equation or point by point.

I hope this helps.

Lidia.
Hi, The way I know is by creating a new material. There you can define B, H and MUR as functions, trhough an equation or point by point. I hope this helps. Lidia.
Monica Arenas
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Posted: 1 decade ago Feb 25, 2010, 9:50 a.m. EST
Hello

I´m with the same problem, I created a new material and loaded my hysteresis curve (attached), but I´m having difficulties to obtain the realtive permeability in function of B and H. How can I set the relative permeability in function of my B and H in the subdomains settings?
Thanks
Hello I´m with the same problem, I created a new material and loaded my hysteresis curve (attached), but I´m having difficulties to obtain the realtive permeability in function of B and H. How can I set the relative permeability in function of my B and H in the subdomains settings? Thanks

Attachments:

Lidia Campa
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Posted: 1 decade ago Feb 25, 2010, 10:14 a.m. EST
You must define in your material the relative permeability (mur) as a function of B. If you do it as a function of H you will get an error message when solving.
Note that B=mu0*mur*H, so you've just to take another set of points with "B" as "x" and "B/(mu0*H)" as "y".

If you find a better solution please tell me, because I'm interested on it.

Regards,

Lidia.
You must define in your material the relative permeability (mur) as a function of B. If you do it as a function of H you will get an error message when solving. Note that B=mu0*mur*H, so you've just to take another set of points with "B" as "x" and "B/(mu0*H)" as "y". If you find a better solution please tell me, because I'm interested on it. Regards, Lidia.
Monica Arenas
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Posted: 1 decade ago Feb 25, 2010, 12:39 p.m. EST
Hi Lidia,

Thank you for helping me.
I introduced the MUR as a function of B, as you recomended. But comsol continue to give me an error message when solving. This time I'm attaching my model so you can have a quickly view and try to help me again! The material is the subdomain number 2.
I'm still trying a different solution, if Iget on good results I'll send you.
Thank you again...

Monica
Hi Lidia, Thank you for helping me. I introduced the MUR as a function of B, as you recomended. But comsol continue to give me an error message when solving. This time I'm attaching my model so you can have a quickly view and try to help me again! The material is the subdomain number 2. I'm still trying a different solution, if Iget on good results I'll send you. Thank you again... Monica

Attachments:

Lidia Campa
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Posted: 1 decade ago Feb 26, 2010, 10:56 a.m. EST
When I was opening the model it gave an error message:

Failed to load file for interpolation function
- File: G:\Proyecto de Investigacin\outro.txt
When I was opening the model it gave an error message: Failed to load file for interpolation function - File: G:\Proyecto de Investigacin\outro.txt
Lidia Campa
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Posted: 1 decade ago Feb 26, 2010, 11:52 a.m. EST
Hello Monica,

I've seen your excel file right now. You may get the error message because you don't have to define the whole hysteresis curve but the positive values. I mean, what you have to define is

normB as a function of normH
normH as a function of normB
MUR as a function of normB

Regards,

Lidia.
Hello Monica, I've seen your excel file right now. You may get the error message because you don't have to define the whole hysteresis curve but the positive values. I mean, what you have to define is normB as a function of normH normH as a function of normB MUR as a function of normB Regards, Lidia.

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