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The magnetic force on a vector current element dl carrying current I in a magnetic field with flux density B is dF = I dl × B (1) In Magnum applied currents are represented by a collection of filamentary elements, so you might think that it would be straightforward to implement automatic routines to find forces on drive coils. [...] My original intent was to write an article to show when it is necessary to use an eddy-current code to find time-varying magnetic fields and when a static field code like Magnum is sufficient. As a preliminary, I thought it would be useful to review how eddy currents affect magnetic fields in single wires. This tutorial [...] Many designs for electromagnets include a coil of the shape shown in Figure 1 wrapped around an iron mandrel with a rectangular cross section. The utility program Magwinder is used to define drive current elements for three dimension magnetic field calculations with the Field Precision Magnum program. In Magwinder, a coil box like Fig. 1 is [...] Popup (or contextual) menus appear when you right-click the mouse. They are a part of almost every Windows program. Nonetheless, it took me some effort to find out how to create popup menus in RealBasic with all the features that I needed. The examples supplied by Real Studio were either out-of-date or simplistic. The only other [...] One of my all-time treasured possessions is a Gerber Variable Scale [1] (Fig. 1). It was an absolute must-have if you were doing science in the 60s and 70s. The idea was straightforward — the device was a ruler consisting of a precision spring that you could adjust to any length to match graphs or oscillographs [2]. [...] |
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