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Magnetic Fields: 2D Axisymmetric Model of Toroid Inductor
Posted 12.06.2013, 13:10 GMT-4 2 Replies
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Hey guys,
I want to determine the inductance of a toroid core + winding as shown in .jpg
I specify an external current density, such that the current flows around the core (in r and z direction).
Under magnetic fields I set Components to In-plane vector.
But it won't converge, I get the message:
Failed to find a solution.
The relative residual (61) is greater than the relative tolerance.
Returned solution is not converged.
I already set some 1S/m conductivity for air and core material, doesn't help.
It would converge, if I set Components to Out-of-plane vector, but then the magnetic field is zero, because all currents are in plane...
I don't want to use a 3D model, since I want to run a sweep through hundreds of simulations... so I really need to get the 2D model running.
I hope somebody can help me out here.
Michael
I want to determine the inductance of a toroid core + winding as shown in .jpg
I specify an external current density, such that the current flows around the core (in r and z direction).
Under magnetic fields I set Components to In-plane vector.
But it won't converge, I get the message:
Failed to find a solution.
The relative residual (61) is greater than the relative tolerance.
Returned solution is not converged.
I already set some 1S/m conductivity for air and core material, doesn't help.
It would converge, if I set Components to Out-of-plane vector, but then the magnetic field is zero, because all currents are in plane...
I don't want to use a 3D model, since I want to run a sweep through hundreds of simulations... so I really need to get the 2D model running.
I hope somebody can help me out here.
Michael
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2 Replies Last Post 13.06.2013, 06:24 GMT-4
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Posted:
1 decade ago
OK, problem solved.
I contacted support and they told me to:
"add Gauge fixing if you solve for in-plane components"
With Comsol 4.2a I did that by right clicking on Magnetic Fields -> Ampere's Law and select 'Gauge Fixing for A-Field'.
I think in Comsol 4.3 this is found directly by right clicking Magnetic Fields..
After that it worked immediately..
I contacted support and they told me to:
"add Gauge fixing if you solve for in-plane components"
With Comsol 4.2a I did that by right clicking on Magnetic Fields -> Ampere's Law and select 'Gauge Fixing for A-Field'.
I think in Comsol 4.3 this is found directly by right clicking Magnetic Fields..
After that it worked immediately..
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Posted:
1 decade ago
Hey,
two remarks:
1) Use copper instead od air for the windings domain
2) Use a frequency domain study, since you cannot determine the inductance with a stationary analysis.
And you might enlarge the air domain, its boundary is quite close to the coil domains...
two remarks:
1) Use copper instead od air for the windings domain
2) Use a frequency domain study, since you cannot determine the inductance with a stationary analysis.
And you might enlarge the air domain, its boundary is quite close to the coil domains...