The .ans file will generate
in the same directory as the .FEM file. Open the .ans file.
Note that if any changes
are made to the .FEM file, solving the problem again will overwrite the
.ans file.
The .ans file should show
the magnetic field lines, which should bend around the target. The outer
boundaries represent a gradient to infinity, so the magnetic field lines
may contort in this region. Only the region contained by the innermost
boundary line is of interest.
Figure 3-1 Axisymmetric
Answer File Showing the Contour Plot of the Magnetic Field
Around the Coil and the Target
Change the contour plot options
Navigate to View →
Contour Plot, or click on the Contour Plot button
In the Contour Plot
Options, change the number of contour lines, as well as their
upper and lower bounds, and click OK.
Figure 3-2 Contour Plot
Options Menu
Add various density plots
Navigate to View →
Density Plot, or click on the Density Plot button
In the Dialog menu,
check the Show Density Plot box.
Select the desired
Plotted Value, generally |Flux Density| (T) or |Current
Density| (MA/m2). Flux density is useful for determining
optimal target placement, because we want the target in the area of
highest flux density. Current density is useful for displaying eddy
currents.
Figure 3-3 Axisymmetric
Answer File Showing Flux Density Plot
Figure 3-4 Axisymmetric
Answer File Showing Current Density Plot That Shows Eddy
Currents on the Target
Change the mesh The mesh is one of the most important aspects in
generating an accurate answer file. Generally, it is best to choose a small mesh
around the coils, the target, and the axis of symmetry (for axisymmetric
problems).
To display the mesh,
navigate to View → Show Mesh, or click the Show Mesh
button
To change the mesh, return
to the .FEM file.
To select the desired
material, click the green materials button then right-click near the desired material
node and press the space bar. The Properties for selected block
menu should open.
Uncheck the Let Triangle
choose Mesh Size box.
Enter a new Mesh size. A
mesh size around 0.01 is a good starting point. Note that the problem
must be solved again to reflect any changes.
View the inductance of the coil
Click the Inductor
button at the top.
The Circuit
Properties menu should open. The inductance will be listed as
Flux/Current.