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help Magnetic field

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hello

I want to calculate the magnetic field (Hz) of the loop circular

the power sapply is a Vsin source
please help me


1 Reply Last Post 19 set 2012, 02:21 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 19 set 2012, 02:21 GMT-4
Hi

first of all, your +air box is very small, I would rather propose to use a sphere, several times bigger than the coil, as magnetic field fills in quite a volume, and would else be strongly influenced by the limited volume you have defined

then for your coil, having current appearing in thin air lik that is not very "physical", I would rather define a circular current density (use a cylindrical coordinate frame, and have a full coil loop

In anycase with you approach, I would have set one face to the GND and the other to the voltage source, just to fix the "0" V, else your equations are "floating" you are missing a reference, which is not really a problem for MF as you do not solve for V, but that could be the case for MEF if you image to use that physics

--
Good luck
Ivar
Hi first of all, your +air box is very small, I would rather propose to use a sphere, several times bigger than the coil, as magnetic field fills in quite a volume, and would else be strongly influenced by the limited volume you have defined then for your coil, having current appearing in thin air lik that is not very "physical", I would rather define a circular current density (use a cylindrical coordinate frame, and have a full coil loop In anycase with you approach, I would have set one face to the GND and the other to the voltage source, just to fix the "0" V, else your equations are "floating" you are missing a reference, which is not really a problem for MF as you do not solve for V, but that could be the case for MEF if you image to use that physics -- Good luck Ivar

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