关键词: 无磁轭分块电枢轴向磁通永磁电机, 三维有限元分析, 齿槽转矩, 电机综合性能

Abstract: In order to meet the requirement of high stability of output torque when the axial-flux permanent magnet machine with yokeless and segmented armature( YASA) was used for electric vehicle traction applications, a new method was proposed to reduce the cogging torque and the torque ripple of YASA machine. The permanent magnets were uniformly segmented radially and grouped, and then the magnet pieces were moved in the same direction. Three-dimensional finite
element analysis was used to study the effect of three different magnet segmenting schemes on the reducing cogging torque. The optimal shifting angles of the magnet pieces and the change of the comprehensive performance of the machine were determined. Simulation results verified the feasibility of the method. The cogging torque was reduced by 92. 62%, the torque ripple under rated condition was reduced by 72. 02%, the eddy-current loss of permanent magnet was reduced by 91. 28%, and the output torque was reduced by no more than 5. 34%, which improved the comprehensive performance of YASA machine.

Key words: axial-flux permanent magnet( AFPM) machine with yokeless and segmented armature( YASA), 3D finite element analysis, cogging torque, comprehensive performance of machine