Comprehensive Investigation on Iteration Algorithms for Solving Nonlinear Magnetic Field Problems

Magnetic properties of electrical materials are of great significance to be accurately modeled and effectively incorporated in numerical analysis of electromagnetic fields. In this article, a hybrid technique (HYS) for solving nonlinear magnetic problems is proposed, combining the advantages of the traditional fixed-point (FP) technique and Newton-Raphson method (NRM). Besides, various material models of a nonoriented steel sheet considering nonlinearity, magnetic anisotropy, or vector hysteresis are constructed and combined with finite-element (FE) codes by means of different iteration algorithms. The adaptation relationship between material models and nonlinear solvers is investigated by simulating an eight-pole, 24-slot permanent magnetic synchronous motor (PMSM), and the efficiency of the presented method is validated.