Abstract
The authors propose a 2-D magnetic field calculation method that takes into account the nonlinear anisotropic property in the grain-oriented steel. An elliptical model is used; the magnetic permeability is represented by a tensor with field-dependent components. This model is applied to a finite-element method using a scalar potential. The iron nonlinearity is considered and a Newton-Raphson method is applied to a family of B-H curves to improve convergence. To minimize variation of flux density between elements, an auto-adaptive process has been used. This modelling of nonlinear anisotropic magnetic fields is applied to a three-phase transformer core. >
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