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A customer working with RFID devices asked me about finding magnetic flux inside a detector coil surrounded by an array of drive coils. The drive coils may move around or rotate. There are no iron structures. The calculations are fast and easy using the free-space mode of Magnum. In this post, I’ll review the required techniques.
We recently added the capability to save and to load plot views (discussed in a previous post) to our two-dimensional TriComp field programs (EStat, PerMag, EMP, Nelson, TDiff, Pulse, RFE2 and WaveSim). In the interactive environment, the Save view command generates a formatted text file FPrefix.FPV where FPrefix is a descriptive name assigned by the user. [...] Although Magnum and PerMag are magnetostatic codes, they can often be used to find AC magnetic field distributions (e.g., transformers and motors). A static field calculation provides a good approximation when the electromagnetic wavelength is much larger than the system scale length. The issue is complicated by the presence of iron and steel, because the speed [...] Recently, a GamBet user reported calculations where the code violated conservation of energy by several orders of magnitude. This is the type of statement that generally catches my attention, so I decided to investigate the issue. An inspection of his input files showed that he was using a bremsstrahlung forcing factor of 1000. If I were [...] Several users have reported intermittent plotting problems when working in Windows 7 with large meshes (i.e., millions of elements) in our 2D and 3D programs. I addressed the problem in a previous blog . In recent tests, I found that the precautions I described in the blog were necessary but not sufficient to ensure reliable plotting. [...] |
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