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    Thermal Analysis of Small-Scale Axial Flux Permanent Magnet Synchronous Motors
    (IEEE, 2024) Karabulut, Yigit; Mese, Erkan; Ayaz, Murat; Aktas, Serkan; Ayhan, Ufuk
    In this study, the advantages of small-scale AFPMSMs over traditional radial flux machines are highlighted, with a focus on their superior torque and power densities and thermal capabilities. This study explores the complex interplay of electrical, magnetic, and thermal processes in AFPMSMs, with a specific emphasis on thermal analysis. A novel contribution of this research lies in the analytical thermal model developed to address the challenges posed by natural convection cooling in AFPMSMs with no air inlet. This model considers intricate fluid flow regimes and temperature-dependent material properties, offering insights into heat convection, joule losses, and material behavior. Experimental validation of the analytical model through prototyping and testing, including thermal and efficiency measurements, strengthens the reliability of the proposed design. Comparisons between analytical predictions and experimental results demonstrate the accuracy of the proposed model in predicting crucial performance metrics. This research delves into the thermal behavior of the AFPMSM under diverse operating conditions, elucidating temperature variations in stator windings and outer cases. Experiments were conducted with a current density of 30 A/mm(2) for AFPMSM. This study also highlights the significantly high thermal capacity of small-scale AFPMSMs.
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    Torque Ripple Minimization Of Coupled Dual Axial Flux Machines For Biomedical Application
    (IEEE, 2024) Karabulut, Yigit; Ayaz, Murat; Aktas, Serkan; Mese, Erkan
    This study explores the advantages of a dual axial flux permanent magnet synchronous machine (AFPMSM) structure compared with a single AFPMSM, addressing the increasing demand for devices with high torque and compact dimensions for a left ventricular assist device (LVAD) pump. The AFPMSM design offers superior torque and power densities, making it a potential solution to the challenges posed by the need for compact yet powerful electric machines. The investigation involves the comparison of efficiency, torque ripple, and thermal losses between a dual-motor AFPMSM configuration and a single-motor setup. Key findings include a significant reduction in torque ripple, from 22% to 12.6%, achieved by assembling dual AFPMSMs at different angles. The dual-motor system also demonstrates the ability to maintain a high efficiency of approximately 60% through optimal load sharing, even at high loads. Thermal analysis revealed substantial temperature reductions, making the dual AFPMSM structure particularly advantageous, especially for small-scale applications. Overall, this research highlights the multifaceted benefits of employing a dual AFPMSM structure in addressing the complexities of high torque and small size requirements in electric machine design.