Electromagnetic finite element analysis is used to analyze characteristics of motors and plays an important role in the research and development of electromagnetic equipment. In particular, optimization of high-power, high-efficiency motors requires faster finite element analysis. However, it is known that the convergence of the conjugate gradient method in solving the simultaneous equations deteriorates when a coupled analysis including the power circuit is performed. In addition, the number of iterations and the computation time increase in the analysis of electromagnetic devices due to the nonlinearity of the magnetic properties of the electromagnetic steel. In order to solve these problems, we tried to improve the convergence by using the deflation method and other methods. The numerical results shows that the deflation method improves the convergence.
Kota Watanabe (Wed,) studied this question.