Shape optimization of flux barriers in IPMSM by using polygon model method with GP

Recently, one of the problems is high efficiency for the electromagnetic machinery like a motor. This paper presents a new method of shape optimization. The target is flux barriers in the interior permanent magnetic synchronous motor (IPMSM) which is adopted as the benchmark model in IEE of Japan. Authors use the polygon model method with genetic programming (GP) by the two-dimensional finite element method (2D-FEM). The purpose is the investigation of shape design of flux barriers to improve the electromagnetic characteristics. In a conventional method as a size optimization, its design parameters are limited in most cases. However, the proposed method is the shape optimization by the tree structure. This method has more freedom for design parameters because the tree structure is possible to express every shape design.