Anotace:
Permanent magnet synchronous motors (PMSMs) have gained many interests in various industrial applications due to its high efficiency, reliable perfaromance, simple structure and various shapes and sizes. In addition, due to the high-torque and low-speed, the PMSM has a wide usage in traction applications, e.g. trucks, ship propulsion, mining, etc. So far, many papers working on three phase PMSMs have been published. But, to improve the fault tolerance and reliability of three-phase PMSM, the six-phase motors has been proposed to use in applications demanding high reliability. However, there are still significant limitations in the quantity of research on this motor type. Particularly, when researching this type of motor, authors mainly have provided specifications of six-phase PMSMs and then conducted experiments on these machines without giving the detailed formulations to compute and analyse electromagnetic parameters of six-phase PMSMs. In this research, an analytic model is first developed to determine the main parameters of the a six-phase surface-mounted permanent magnet synchronous motor (SPMSM). The finite element method (FEM) is then introduced to simulate and compute electromagnetic parameters, such as the current waveform, back EMF, flux density distribution, torque, cogging torque, torque ripple and harmonic components. The development of the proposed methods is applied on the practical problem of a six-phase PMSM of 7.5kW.