PC-based numerical calculation of highly saturated magnetic materials using the finite differences method

A finite-difference method (FDM) is presented that is well suited to cope with highly saturated iron parts. The system of equations is solved by a double iteration method. Instead of the usual B-H curve of iron materials, a μ(B) table is used. For induction values above 3 T the table is extrapolated by an appropriate theoretical function. Using a standard PC it is possible to handle nonlinear problems with up to 6000 points in about four hours computing time. This is sufficient to calculate a large variety of two-dimensional problems with high accuracy. The practical use of the program is demonstrated by several examples