Figure 5: Circuit Property results dialog.
Since the problem is linear and there is only one current, the Flux/Current result can be
unambiguously interpreted as the coil's inductance (i.e. 22.9 mH). The resistance of the coil
is the Voltage/Current result (i.e. 3.34 Ω).
3.3 Plotting field values along a contour
FEMM can also plot values of the field along a userdefined contour. Here, we will plot the
flux density along the centerline of the coil. Switch to Contour mode by pressing the Contour
Mode toolbar button. You can now define a contour along which flux will be plotted. There
are three ways to add points to a contour:
1. Left Mouse Button Click adds the nearest input node to the contour;
2. Right Mouse Button Click adds the current mouse pointer position to the contour;
3. Key displays a point entry dialog that allows you to enter in the coordinates of a
point to be added to the contour.
Here, method 1 can be used. Click near the node points at (0,4), (0,0), and (0,4) with the
left mouse button, adding the points in the above order. Then, press the Plot toolbar button
. Hit OK in the XY Plot of Field Values popup dialog (as shown in Figure 6). The default
selection is magnitude of flux density. If desired, different types of plot can be selected
from the drop list on this dialog.
Figure 5: Circuit Property results dialog.Since the problem is linear and there is only one current, the Flux/Current result can beunambiguously interpreted as the coil's inductance (i.e. 22.9 mH). The resistance of the coilis the Voltage/Current result (i.e. 3.34 Ω).3.3 Plotting field values along a contourFEMM can also plot values of the field along a userdefined contour. Here, we will plot theflux density along the centerline of the coil. Switch to Contour mode by pressing the ContourMode toolbar button. You can now define a contour along which flux will be plotted. Thereare three ways to add points to a contour:1. Left Mouse Button Click adds the nearest input node to the contour;2. Right Mouse Button Click adds the current mouse pointer position to the contour;3. Key displays a point entry dialog that allows you to enter in the coordinates of apoint to be added to the contour.Here, method 1 can be used. Click near the node points at (0,4), (0,0), and (0,4) with theleft mouse button, adding the points in the above order. Then, press the Plot toolbar button. Hit OK in the XY Plot of Field Values popup dialog (as shown in Figure 6). The defaultselection is magnitude of flux density. If desired, different types of plot can be selectedfrom the drop list on this dialog.
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