Browsing by Author "Tarvirdilu-Asl,R."
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Conference Object Citation Count: 2FEM-based design modifications and efficiency improvements of a brushed permanent magnet DC Motor(Institute of Electrical and Electronics Engineers Inc., 2017) Ertan, Hulusi Bülent; Zeinali,R.; Ertan,H.B.; Electrical-Electronics EngineeringThis paper describes design modifications of a brushed permanent magnet DC motor. Test motor is modeled using a Finite Element Method (FEM) based software. Model accuracy is investigated by comparing measurement and simulation results. Reducing material consumption in motor fabrication while the motor develops the desired torque at a higher efficiency is aimed in this paper. Modifications are done in three stages and simulations results are also presented. These results are also compared to simulation results of the test machine. © 2017 IEEE.Conference Object Citation Count: 4Magnetically geared direct drive wind generator thermal analysis(Institute of Electrical and Electronics Engineers Inc., 2017) Ertan, Hulusi Bülent; Ertan,H.B.; Yamali,C.; Tarvirdilu-Asl,R.; Electrical-Electronics EngineeringThis paper considers Dual Stator Spoke Array Vernier Permanent Magnet (DSSA-VPM) generator for the direct drive wind-electric energy conversion. The structure of the generator is described. Although how this design is optimized is not discussed, dimensions of the designed generator are given. In electrical machine design thermal performance is naturally of utmost importance. In this paper thermal performance of the design and how its temperature can be kept within the temperature limit imposed by its insulation class and the permanent magnets used is investigated. It is found that when air flow within the generator is not permitted, at rated load condition the generator temperature reaches very high levels. To lower the operating temperature, ventilation holes are introduced to the end plates of the frame. Also some blades are placed on the rotor to help flow of air over the end windings. A model is introduced to calculate the air speed in the region where air flows. Using the calculated air speed a new heat transfer coefficient is determined for the region where air flows. It is found out that with the mentioned modifications to the structure of the generator the designed generator temperature rise can be kept within the value permitted for its insulation class. Therefore, the power density of the design can be safely compared with the power density of other types of designs for direct drive turbines. It is found that DSSA-VPM generator topology offers a clear advantage over other types of generators considered in the literature. © 2017 IEEE.