Yazar "Karabulut, Yigit" seçeneğine göre listele

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    Comparison study on SMC and grain-oriented laminated steel core for small-size axial flux permanent-magnet synchronous machines
    (IOP Publishing Ltd, 2024) Karabulut, Yigit; Mese, Erkan; Ayaz, Murat; Aktas, Serkan
    This study aims to compare the soft magnetic composite (SMC) and grain-oriented (GO) steel stator axial flux permanent-magnet synchronous machine (AFPMSM) in terms of performance and iron losses. Stator cores are manufactured using both materials to perform experimental performance tests. The produced machines are designed for pump propulsion systems in left ventricular assist devices as an application area. The machines are modeled with several analytical equations, and iron losses and performance tests are carried out with AFPMSMs, finite element methods, and experimental setups. Our findings show that the torque density is higher in the GO steel stator AFPMSMs that can produce 15.07 percent more torque. GO steel material experimentally has 20.33 percent less iron loss as SMC material since the loss value per kilogram for SMC material is higher than that for GO steel. In addition, the saturation value of the SMC material is lower than that of the GO material according to the magnetic flux density value.
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    Determination of in-row seed distribution uniformity using image processing
    (Tubitak Scientific & Technical Research Council Turkey, 2016) Cakir, Engin; Aygun, Ikbal; Yazgi, Arzu; Karabulut, Yigit
    The objective of this study was to determine the seed distribution uniformity of seeding machines using a low sensitivity (maximum 300 frames per second (fps)) high-speed camera and image processing method for corn, cotton, and wheat seeds under laboratory conditions. For this purpose, a high-speed camera with 100, 200, and 300 fps was used to measure the seed drop from the seeding tube onto the sticky belt. Video images then were transferred to the image processing algorithm, from which seed distribution can be calculated. The calculated measurements were compared statistically with the measurements obtained from sticky belt tests. According to the results for determining corn and cotton seed spacing by high-speed camera, the camera was successful only for corn seeds. For cotton seeds, camera readings were significantly different from the readings from the sticky belt due to the fact that capturing the cotton seed trajectory was not sufficient compared to the corn seed trajectory. Measuring the wheat seed spacing by high-speed camera was impossible with lower speeds of the camera. Wheat kernels could not be captured successfully by the camera at speeds of 100 and 200 fps. Therefore, only 300 fps speed was used to measure the seed spacing of wheat.
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    Influence of Rotor Magnet Step Shifting on Torque Ripple of Multiphase Axial Flux Permanent Magnet Machines
    (Ieee, 2019) Karabulut, Yigit; Mese, Erkan
    The aim of this study is to predict the torque quality performance of multiphase axial flux permanent magnet (AFPM) machine when magnet shifting and stepping are applied. Three, five and seven phase machines are investigated and design options such as two-step, three-step are compared analytically. It was found that torque ripple is reduced in all multiphase machines with three-step and two-step shifting. As far as the average torque is concerned, step shifting of the magnet has more influence on high-phase number machine when compared with low-phase number machine.
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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 Performance Comparison Between Slotted and Non-Slotted Axial Flux PCB Winding Machine
    (Ieee, 2021) Karabulut, Yigit; Mese, Erkan
    The aim of this study is to compare the slotted and non-slotted axial flux permanent magnet machines (AFPM) when the printed circuit board (PCB) winding is applied to stator. The machines are designed with different turn numbers because of slot type. It was found that the torque density is higher in the slotted AFPM also in the slotted machine, higher number of PCB layer can he used to increase torque density because of constant magnetic flux density distribution. On the other hand, torque ripple is reduced when non-slotted machine is used. For small scale applications with high torque density requirements, it is better to use slotted PCB winding machines.
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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.