A state space approach and formulation for the solution of nonlinear 3-D transient eddy current problems

A novel method is presented for 3-D nonlinear transient eddy current and field computations, utilizing the state-space approach for handling the time variation. A nonlinear magnetic circuit example was successfully implemented. The results of the proposed method are compared with those of the Crank-Nicholson technique and measured data. These comparisons reveal excellent agreement, and the proposed method outperforms the Crank-Nicholson technique in CPU time, calculating the results in less than 25% of the time required by the Crank-Nicholson method. Formulation details, numerical results, and the various comparisons are given