Investigation on an arc-linear axial flux permanent-magnet synchronous machine

A kind of arc-linear axial flux permanent-magnet synchronous machine (AL-AF-PMSM) used for scanning system is researched in this paper. Due to the characteristics of the three-dimensional (3-D) magnetic field, 3-D finite element method (FEM) is usually required to analyze the AF-PMSM. However, 3-D FEM is generally too time consuming. In order to avoid this problem, an approximate equivalent 2-D calculating model is proposed based on the idea of Complex Simpson integral formula. Then this method is validated by comparing with the 3-D FEM results. Finally, with the help of this new method, the AL-AF-PMSM is optimized to reduce the torque fluctuation and improve the smooth operating range.