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First I would like to congratulate Dave and his co-workers on a first-class
piece of work. From the time I was introduced to the FEMM package by one
of my colleagues to obtaining validated results from three planar permanent
magnet models was just one day.
I have a few (constructive) suggestions and a question:
It is sometimes useful to be able to divide the air spaces around the
magnet and airgap into regions, so that the mesh density can be increased
in critical areas. This is easy using Segments or Arc Segments, but I
would like to be able to hide these segment lines on the Femm View display and
printout, since they are not part of the problem. A provision for
suppressing the appearance of selected lines would be a handy user feature,at
least at the Femm View stage.
It would also be useful to be able to vary the range of colours or
equivalent grey tones for the density plot and its legend. This can be a
help when preparing output for eg; publication.
As a raw beginner, I had some difficulties with lack of explanation inthe
manual for specific dialog box requests. In the "Properties for selected
block" box, I couldn't understand what the "side length" referred to, untilI
connected it with the fact that I had generated over 32000 triangles in one
small bounded area!
My question concerns the axis-symmetric mode of operation. It seems
to me that it should be possible to model a wedge of a cylindrically symmetric
system, which is presumably the case for the "axi1.fem" example given. I
would like to generate a model based on a cylindrically symmetric permanent
magnet, in which the left vertical boundary is the apex of the wedge and
coincides with the magnet axis. The magnet field direction is parallelto
the cylindrical axis. My efforts so far seem to produce nonsense, probably
because I do not yet understand how to set the correct boundary
conditions. If someone can provide a simple example I would be
grateful.
Thanking you in
anticipation.
Peter Ellis
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