VP7-04 Investigation on Influence of Varying Design Dimensions of AFSRM on Output Performance
Creators: Qichen Guo
Wei Zhang
Publisher: name: IEEE
Year: 2025

During the 3D design process of axial flux switch reluctance motors (AFSRMs), certain design dimensions such as pole arc and yoke height are difficult to obtain through direct calculations. Additionally, when designing rotor teeth, it is typical to make the rotor tooth edge extensions intersect at the center of the motor. However, the unique structure of axial flux motors allows for significant optimization of the rotor tooth shape. Taking a 12/8 poles three-phase AFSRM as a case study, this research establishes a motor model utilizing the equivalent magnetic circuit method, analyzes the impact of the above factors on inductance and torque. Utilizing the optimal switching angles of various dimension conditions obtained from genetic algorithm (GA), finite element analysis was employed to explore the influence of these factors on both the average torque output and the torque ripple of the motor. The results suggest that increasing the stator and rotor yoke height helps improve the average torque and reduce torque ripple, but the benefits diminish with increasing yoke height. Moderately increasing the rotor pole arc helps enhance average torque but also increases torque ripple. The stator pole arc has the greatest impact on output performance, and appropriately increasing it helps improve average torque and reduce torque ripple. Adjusting the rotor pole arc by increasing it on the inner circle and reducing it on the outer circle, so that the intersection of the rotor tooth edge extension line is appropriately positioned away from the center of the motor, helps to improve the average torque and reduce torque ripple. During assembly, there can be deviations such as rotor eccentricity and non-uniform air gaps in axial flux motors, which may influence the motor's output performance. This paper explores the effects of these assembly deviations on motor performance, revealing that eccentricity of the rotor can lead to a reduction in average torque and an increase in torque ripple while minor irregularities in the air gap have negligible effects on motor performance.References: [1] H. Goto, S. Murakami and O. Ichinokura, IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society, Yokohama, Japan, pp. 005191-005196 (2015) [2] M. Sepehrinour, A. Kalantarikhalilabad and A. Rezaei-Zare, 2023 IEEE International Electric Machines & Drives Conference (IEMDC), San Francisco, CA, USA, pp. 1-7 (2023) [3] D. Gong and J. Chen, Journal of ACTA ELECTRONICA SINICA, vol. 42, no. 8, pp. 1538-15244 (2014)
During the 3D design process of axial flux switch reluctance motors (AFSRMs), certain design dimensions such as pole arc and yoke height are difficult to obtain through direct calculations. Additionally, when designing rotor teeth, it is typical to make the rotor tooth edge extensions intersect at the center of the motor. However, the unique structure of axial flux motors allows for significant optimization of the rotor tooth shape. Taking a 12/8 poles three-phase AFSRM as a case study, this research establishes a motor model utilizing the equivalent magnetic circuit method, analyzes the impact of the above factors on inductance and torque. Utilizing the optimal switching angles of various dimension conditions obtained from genetic algorithm (GA), finite element analysis was employed to explore the influence of these factors on both the average torque output and the torque ripple of the motor. The results suggest that increasing the stator and rotor yoke height helps improve the average torque and reduce torque ripple, but the benefits diminish with increasing yoke height. Moderately increasing the rotor pole arc helps enhance average torque but also increases torque ripple. The stator pole arc has the greatest impact on output performance, and appropriately increasing it helps improve average torque and reduce torque ripple. Adjusting the rotor pole arc by increasing it on the inner circle and reducing it on the outer circle, so that the intersection of the rotor tooth edge extension line is appropriately positioned away from the center of the motor, helps to improve the average torque and reduce torque ripple. During assembly, there can be deviations such as rotor eccentricity and non-uniform air gaps in axial flux motors, which may influence the motor's output performance. This paper explores the effects of these assembly deviations on motor performance, revealing that eccentricity of the rotor can lead to a reduction in average torque and an increase in torque ripple while minor irregularities in the air gap have negligible effects on motor performance.References: [1] H. Goto, S. Murakami and O. Ichinokura, IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society, Yokohama, Japan, pp. 005191-005196 (2015) [2] M. Sepehrinour, A. Kalantarikhalilabad and A. Rezaei-Zare, 2023 IEEE International Electric Machines & Drives Conference (IEMDC), San Francisco, CA, USA, pp. 1-7 (2023) [3] D. Gong and J. Chen, Journal of ACTA ELECTRONICA SINICA, vol. 42, no. 8, pp. 1538-15244 (2014)