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Electromagnet
Posted Mar 7, 2012, 3:25 p.m. EST Version 4.2a 2 Replies
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Hello Comsol community and it's members,
I have modelled an electromagnet, where the Yoke has 2 coils near the split (Please see the attached mph file) . I want to check how saturation of the Iron Yoke varies with increasing field B. I have solved the linear problem, where miu(r) (relative permeability) is constant (4000). Now I want to solve the problem non linearly, where Miu(r) depends on B, or H depends on B, but the problem is, when I make "user defined" miu(r) or "HB curve- User Defined H" and input a function, Comsol solves it, but ignores the Iron Core completely! Plus, the values of the Magnetic field goes sky high up to thousands of Tesla, which is "probably" not physical.
I hope you'll be able to help me with this problem,
Many Thanks in advance,
Konstantin
I have modelled an electromagnet, where the Yoke has 2 coils near the split (Please see the attached mph file) . I want to check how saturation of the Iron Yoke varies with increasing field B. I have solved the linear problem, where miu(r) (relative permeability) is constant (4000). Now I want to solve the problem non linearly, where Miu(r) depends on B, or H depends on B, but the problem is, when I make "user defined" miu(r) or "HB curve- User Defined H" and input a function, Comsol solves it, but ignores the Iron Core completely! Plus, the values of the Magnetic field goes sky high up to thousands of Tesla, which is "probably" not physical.
I hope you'll be able to help me with this problem,
Many Thanks in advance,
Konstantin
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2 Replies Last Post Mar 8, 2012, 8:20 a.m. EST
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Posted:
1 decade ago
Hi!
I have modified your file: soft iron with losses as example. The HB-curve is defined in the material.
You have to add an extra Ampere's Law for the iron part and change Magnetic Field definition to HB-curve.
Air domain should be left to mur=1.
Ralf
I have modified your file: soft iron with losses as example. The HB-curve is defined in the material.
You have to add an extra Ampere's Law for the iron part and change Magnetic Field definition to HB-curve.
Air domain should be left to mur=1.
Ralf
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Posted:
1 decade ago
Thank you Ralf!
Very nice results!!!
Now I'll try to understand how you did it.
Konstantin
Very nice results!!!
Now I'll try to understand how you did it.
Konstantin