I. Introduction
Recently, electromagnetic field analysis using the finite element method became an indispensable tool for development of electric machines. Thousands of iterative calculations are often carried out to optimize the shapes of the machines. However, considerable time and effort are frequently needed to make proper finite element meshes in the optimization process. Furthermore, the results of the finite element analysis are determined not only by the variation of the shape of the machine, but also by the variation of the mesh. Thus, it can be said that relatively dense meshes should be required to estimate the machine characteristics, especially in the case of the minor shape modifications.