Magnetostatic problems including iron components can be solved by a nonlinear indirect volume integral equation. Its unknowns are scalar field sources. They are evaluated iteratively. In doing so the integral representation of fields has to be calculated. At edges singularities occur. Following a method to calculate the field strength on charged surfaces a way out is presented.
Groh, F., Hafla, W., Buchau, A. and Rucker, W.M. (2004), "Field strength computation at edges in nonlinear magnetostatics", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 23 No. 3, pp. 662-669. https://doi.org/10.1108/03321640410540575
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