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This article describes a design optimization of an axially laminated rotor of the synchronous reluctance motor, using the optimization method combined with the magnetic field analysis. The magnetic flux distribution in the synchronous reluctance motor is distorted due to the complicated rotor configuration and the influence of magnetic saturation, which results in a large number of local minimum solutions. Therefore, taking account of the magnetic saturation by the finite element method, the authors propose a novel optimization approach by coupling the stochastic search method with the deterministic one. In the optimization process a suitable objective function for the stability of machine performances is also proposed. Finally some numerical results that demonstrate the validity of the proposed approach are presented.

����� �Hayato Ando (Stu. Mem.), Yuichiro Kai (Mem.), Masato Enokizono (Mem.)This paper presents vector magnetic characteristic analysis of PM motor by using complex E&S modeling taking account of stress effect. It is well known that the magnetic properties of the electrical steel sheets are generally deteriorated due to influence of mechanical stress. However we can reduce iron losses under limited stress conditions in past researches. A low iron losses PM motor designed by taking account of stress effect is presented.

This�paper presents vector magnetic characteristic analysis by using the complex E&S modelling taking account of stress effect. According to the past researches, we have evaluated the magnetic field strength H vector under controlled stresses and sinusoidal magnetic flux density waveforms. However, it is impossible to control the magnetic flux density B in actually magnetized motor cores. Therefore, it is necessary to know the relationships between Band H-vector under the controlled stress and the non-controlled magnetic flux conditions. In this paper, we report the measured and calculated relationship between Band H-vector under stressed conditions and given sinusoidal voltage conditions. The trajectories and parameters of the Band H-vector under stress, calculated by using the Stress-Complex E&S (SCE&S) modeling, were agreed well with those of the measured Band H-vector.