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magnetic flux integration with magnetic field
Posted 24.07.2012, 11:33 GMT-4 Low-Frequency Electromagnetics 3 Replies
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Hi,
I am trying to do a magnetic flux integration from magnetic field.
I defined a boundary (in 3D geometry) of integration 'boun_flux', then typed the eqn in variables as:
flux = boun_flux(mef.normH)
but I think something's wrong, since the inductance I'm calculating should be 3.36e-10 H. But I'm getting 1.5e-10 H. That is too much as an error percentage, right?
Could you please help me?
I am trying to do a magnetic flux integration from magnetic field.
I defined a boundary (in 3D geometry) of integration 'boun_flux', then typed the eqn in variables as:
flux = boun_flux(mef.normH)
but I think something's wrong, since the inductance I'm calculating should be 3.36e-10 H. But I'm getting 1.5e-10 H. That is too much as an error percentage, right?
Could you please help me?
3 Replies Last Post 24.07.2012, 17:22 GMT-4
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Posted:
1 decade ago
Hi,
It doesnt seem to be such a big error considering you are in the 1e-10 H order. But I am not sure about your
flux = boun_flux(mef.normH). normH is norm of the vector H. But the flux is not the integral of the norm of H over a surface. This is the integral of the component of B normal to the surface over the surface.
--
L. Queval
It doesnt seem to be such a big error considering you are in the 1e-10 H order. But I am not sure about your
flux = boun_flux(mef.normH). normH is norm of the vector H. But the flux is not the integral of the norm of H over a surface. This is the integral of the component of B normal to the surface over the surface.
--
L. Queval
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Posted:
1 decade ago
Mr. Queval,
thank you. Yes I know that the flux is the integral of the component of B normal to the surface over the surface.
My surface is a rectangle in yz plane. So, the normal component of the field to this surface is the x component of the field.
So I typed:
boun_flux(mef.Hx)
However with this, the inductance comes much more smaller: 9e-12 H.
I don't think I did something wrong in the calculation of the current.
I chose a surface again and typed:
boun(mef.normJ)
Since mefJ is current density, it makes sense to integrate like this.
thank you. Yes I know that the flux is the integral of the component of B normal to the surface over the surface.
My surface is a rectangle in yz plane. So, the normal component of the field to this surface is the x component of the field.
So I typed:
boun_flux(mef.Hx)
However with this, the inductance comes much more smaller: 9e-12 H.
I don't think I did something wrong in the calculation of the current.
I chose a surface again and typed:
boun(mef.normJ)
Since mefJ is current density, it makes sense to integrate like this.
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Posted:
1 decade ago
My geometry is coax. You can see the picture in the attachment.
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