[W-SE-75] Iterative Calculations and Convergence Characteristics

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1. Introduction

In electromagnetic field finite element analysis (FEA) [1] [2] which is often used in electrical equipment design,
there are two iterative processes shown in Fig. 1. The outer loop is nonlinear iteration (Newton-Raphson) for
deciding the material property [3] [4], and the inner one is solving of linearized equations (ICCG). In these
iterative processes, there are issues in which necessary precision cannot be obtained and/or unnecessary
processing time is required unless the appropriate determination methods or tolerance values are used. To
overcome these challenges, we are taking on various approaches to stabilize iterative processing. In this report,
we will explain the convergence criteria of a local quantity and the improvement of the determination of
convergence of ICCG. And then, we describe that these ideas make a good effect to the known problems about
the convergence characteristics [5].

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