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AC Coil Problem

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Good morning,

we are a group of students and try to simulate a conduction cooker.
But we have serious problems modeling the AC coil.
We are thankful for every hints or tips or a little example model we could use.

Normaly, such cookers work with 50-100 kHz and up to 3000 W´s.

Thanks for your help.

1 Reply Last Post 21 juil. 2010, 06:15 UTC−4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 21 juil. 2010, 06:15 UTC−4
Hi

For me it looks fin as start, I would though use a cylindrical coordinate and define the current with that one (Model - Definitions - Cylindrical coordinate system" + "Model - MF - Extgernal Current density": use cylindrical coordinate, 0,J0[a/m^2],0

One can use PML to have a smaller air cylinder and infinite elements.

If you have AC, then Frequency Domain solving is to be used, this means a harmonic development of the equations.
But then the question is around sigle coil / multiple coil winding, as there are skin effects (AC & f>5Hz) that is different for single/multiple windings. This you can simulate in 2D axi, then one could use the current density of a 2D axi to map it onto a 3D (extrusion couplings). There are a couple of other discussions about this on the forum
--
Good luck
Ivar
Hi For me it looks fin as start, I would though use a cylindrical coordinate and define the current with that one (Model - Definitions - Cylindrical coordinate system" + "Model - MF - Extgernal Current density": use cylindrical coordinate, 0,J0[a/m^2],0 One can use PML to have a smaller air cylinder and infinite elements. If you have AC, then Frequency Domain solving is to be used, this means a harmonic development of the equations. But then the question is around sigle coil / multiple coil winding, as there are skin effects (AC & f>5Hz) that is different for single/multiple windings. This you can simulate in 2D axi, then one could use the current density of a 2D axi to map it onto a 3D (extrusion couplings). There are a couple of other discussions about this on the forum -- Good luck Ivar

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