![]() ![]() but it does not have a facility to determine what max flux saturation could be. What if I want to integrate the flux over a volume (the whole cylinder), but continue to take only the component that is normal to the end of the cylinder ? That is, dot the B field there with the normal of one of the end surfaces.Hello folks i am mucking about with ferrite cores and other misc cores i am using this software tool to help with some numbers due to my lack/low-level of theory i need help to find out how does the software determine a certain core at certain frequency can only contain X amount of max flux example : using the AL/ui tool inside the software if i have a JOHNDOE core 20mm x 10mm x 10mm (coating 0.1mm) and if we obtain (example) 100uH from 10 turns (say by measuring off a LCR meter) we get AL = 1000nH/n^2 and ui = 769.2. Can I use the normals from some particular surface in my expression for the volume integral?īut here is a further problem. What if I want to integrate the flux over a volume (the whole cylinder), but continue to take only the component that is normal to the end of the cylinder ? That is, dot the B field there with the normal of one of the end surfaces. (presumably one of unx or dnx will be the same as nx ?)īut here is a further problem. For interior boundaries, there are up and down possible directions for the normals, so both are provided (unx, dnx, etc.) I see in the documentation (p92 in the 4.0a user man) that there are the normal vectors, nx, ny, nz. That is an expression for the normal to the surface of integration. Consequently, it is easy to integrate the component of magnetic flux (B field) in the direction normal to the end of the cylinder: it is simply the surface integral of emqav.Bzīut in any other case, when the cylinder is no longer parallel with the z-axis, I would need something similar to what Kevin is looking for. Presently I have a cylindrical volume aligned with the z axis in a 3D model. I am trying to do the same calculation Kevin mentions, an integration of the magnetic flux density through a surface. Or is it necessary for me to only enter the radial component of the magnetic flux density as my expression under Boundary Integration? When I enter sqrt(Bx_emqa^2 + By_emqa^2) as my expression under Boundary Integration, does COMSOL 'know' to only integrate the radial component of the total flux density (since the azimuthal component contributes nothing to the flux given my surface)? Expressed in terms of cylindrical coordinates, some of this magnetic flux is directed in the radial direction and some is directed in the azimuthal direction. The question I am asking then is when calculating the flux, does COMSOL 'know' that only the radial component of the magnetic flux density contributes to the flux (given the surface I am integrating over)?įor instance sqrt(Bx_emqa^2 + By_emqa^2) gives me the magnitude of the magnetic flux density. (The azimuthal component of the magnetic flux density does not contribute anything.) Therefore only the radial component of the magnetic flux density contributes to the flux. In this case, with the curved surface I'm integrating over, the surface normal points only in the radial direction. The flux through a surface is computed by taking the dot product of the magnetic flux density vector and differential surface vector (and then integrating over the surface). It makes sense to me that the COMSOL answer I get will be in terms of Wb/m and I will have to multiply by the height of the object to get the flux in Wb. ![]()
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