Abstract
As the demand for drive quality in automotive hub motors is increasing, the need for reduced cogging torque is also increasing. In this paper, the cogging torque of a soft magnetic composite (SMC) based yokeless and Segmented Armature (YASA) Axial Field Permanent Magnet Motor is investigated. Three models of YASA motor with skewed stator slot, segmented shift and unequal stator slot width are developed and the cogging torque waveforms of the three stator topologies are analyzed and compared. The output performance of the motor with the three topologies was analyzed by 3D finite element simulation, including no-load back EMF, electromagnetic torque and torque ripple, and axial magnetic force. The results show that all three stator topologies can effectively reduce the cogging torque and torque ripple in the YASA motor. Compared with the pre-optimization structure, the output torque of the skewed stator slot and segmented shift stator structure decreases more, while the output torque of the unequal stator slot width structure remains almost the same. Meanwhile, the axial magnetic force is almost constant before and after the optimization of the three stator topologies.
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