Structural optimization design for rotor of IPMSM by using differential evolution

Recently, one of the most important problems is energy shortage. Therefore, it is required the high efficiency electromagnetic device like motors. One of them is interior permanent magnetic synchronous motor (IPMSM). It has a high degree of freedom of shape design because permanent magnets are placed in the interior of a rotor. This paper presents optimal design method of a rotor in IPMSM by differential evolution (DE). DE is one of the multi-point search methods and it is strongly affected by real-coded genetic algorithm (GA). Authors investigate usefulness of the proposed method by comparison of simulation results.