| Axial flux permanent-magnet synchronous machines(AFPMSM) have a lot of advantages such as short axial dimension, compactness and lightness, which make them being widely used in many applications like marine propulsion, electric vehicle wheel moor drives, gearless wind generators and precise serve system. Special magnetic circuit structure makes AFPMSMs plenty of topologies, so they could be used in different applications.In this paper, a surface mounted dual rotors single stator slotless 3-phase AFPMSM was studied. The surface mounted magnets on the rotors have the same magnetic direction. stator must has iron core with no slots on it, the iron core carries a 3-phase winding wound in a torodial fashion by means of concentrated coils which have rectangular shape according to the core cross section. The axial dimension and the volume can be reduce through more pole numbers. The axial-directed end-winding, lengths are relatively short, yielding low resistance and reduced power loss thereby. So this type of machines is suitable in applications of low speed, high torque and high efficiency.This paper firstly talk about how the machine parameters effect on the performance of machine, then a unified analytical model is built to determine the no-load flux and armature flux. Because of the unusual specification of flux distribution,3D magnetic field numerical computation must be used, so saturation, fringing flux and leakage flux could be taken into account. An array of specific dimension parameters was chosen and 3D scalar potential method was implemented to compute and analyse the static flux distribution of the machine. In the future machine design, we can indicate the performance of machine, optimum design and enhance the design efficiency on the base of this paper.
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