Title :
Magnetic Diffusion Times for Infusion and Effusion in Nonlinear Steel Slabs and Cylinders
Author_Institution :
Milwaukee Sch. of Eng., Fish Creek
fDate :
7/1/2007 12:00:00 AM
Abstract :
Magnetic diffusion time in nonlinear steel is shown to vary with applied field magnitude and whether the field is undergoing infusion (inward flow upon turnon) or effusion (outward flow upon turnoff). Transient finite-element analysis is used to compute planar flux effusion that agrees very closely with an analytical equation for unsaturated steel slabs. When the steel is saturated, it is shown that effusion times can be much longer than infusion times, which are greatly reduced by saturation. Effusion times are computed for varying levels of saturation both in planar slabs and in axisymmetric cylinders.
Keywords :
diffusion; eddy currents; effusion; finite element analysis; magnetic flux; magnetostatics; slabs; steel; FeCJk - System; axisymmetric cylinders; infusion; magnetic diffusion times; nonlinear steel cylinders; nonlinear steel slabs; planar flux effusion; planar slabs; transient finite-element analysis; Coils; Conducting materials; Engine cylinders; Finite element methods; Magnetic analysis; Magnetic flux; Magnetic materials; Saturation magnetization; Slabs; Steel; Diffusion; eddy currents; finite-element analysis; nonlinear; saturation;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.890267