Computation of nonlinear transient eddy current electromagnetic fields in devices driven by power electronic circuits

A method of computing nonlinear, transient electromagnetic fields with eddy currents, in which the magnetic vector potential is decomposed into two components is presented. The transient electromagnetic field is coupled with equations describing the external driving circuits with power electronic components. The nonlinearity of magnetic materials is treated through a modified Newton´s nonlinear iterative scheme combined with a time-domain, piecewise elemental linearisation that enables the implementation of the decomposed magnetic vector potential method. A practical application of the method to a study of the transient characteristics of a tubular linear actuator is presented to show the effectiveness of the proposed method