Browsing by Author "Ertan,H.B."
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Conference Object Citation Count: 3Comparison of a Magnetically Geared PM Wind Generator with Radial Flux Generator(Institute of Electrical and Electronics Engineers Inc., 2018) Ertan, Hulusi Bülent; Ertan,H.B.; Electrical-Electronics EngineeringDirect drive wind turbines promise to be more reliable and efficient than commonly used geared wind turbines. This paper presents part of a study aiming to identify whether 'Dual Stator Spoke Array Vernier Permanent Magnet' (DSSAVPM) generators present an advantage, regarding size or cost, as compared to the conventional radial flux PM machine for direct drive applications. For this purpose, design of both machines is optimized for the same specifications and using the same design criteria. optimization results are presented and discussed. It is found that a DSSVPM generator design, with almost the same performance as the RFPM generator, but with 45% of its mass is possible. © 2018 IEEE.Conference Object Citation Count: 3Comparison of a Magnetically Geared PM Wind Generator with Radial Flux Generator(Institute of Electrical and Electronics Engineers Inc., 2018) Ertan, Hulusi Bülent; Ertan,H.B.; Electrical-Electronics EngineeringDirect drive wind turbines promise to be more reliable and efficient than commonly used geared wind turbines. This paper presents part of a study aiming to identify whether 'Dual Stator Spoke Array Vernier Permanent Magnet' (DSSAVPM) generators present an advantage, regarding size or cost, as compared to the conventional radial flux PM machine for direct drive applications. For this purpose, design of both machines is optimized for the same specifications and using the same design criteria. optimization results are presented and discussed. It is found that a DSSVPM generator design, with almost the same performance as the RFPM generator, but with 45% of its mass is possible. © 2018 IEEE.Conference Object Citation Count: 1Designing High Power Density Induction Motors for Electric Propulsion(Institute of Electrical and Electronics Engineers Inc., 2022) Ertan, Hulusi Bülent; Siddique,M.S.; Koushan,S.; Azuaje-Berbeci,B.J.; Electrical-Electronics EngineeringDesigning high-power-density electric motors for propulsion has become an increasingly important issue in the past few decades. This is not only because electric vehicles are projected to become the main private transportation means in near future, but also because of the ever so important metro and railway transport requirements. Along with these application areas, electric aircraft propulsion is also coming into focus in recent years. Electric motors for traction are required to have high torque density, high efficiency over a wide speed range and are required to be robust. In recent years, permanent magnet (PM) motors became the favorite choice for such applications because of their higher efficiency than other types of motors. Increasing demand for permanent magnets is likely to cause supply problems. Therefore, permanent magnet-free alternative motor types are of much interest. In this paper, the authors present the design of a 125 kW induction motor for railway application. This design has 3-times the power density of a commercial induction motor. The designed motor is manufactured and its test results are used for establishing an accurate finite-element model for the prediction of its performance. This model is used to investigate the effect of magnetic loading choice, slot shape and magnetic material choice on the efficiency of the motor. It is shown that with the same basic dimensions the efficiency of the motor can be increased to 96% which is comparable with a similar size PM motor. © 2022 IEEE.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.Conference Object Citation Count: 0Predicting Thermal Behavior of Lithium-ion Batteries for Electric Car Applications(Transilvania University of Brasov 1, 2023) Ertan, Hulusi Bülent; Ertan,H.B.; Electrical-Electronics EngineeringAs the popularity of electric vehicles increases, significant research is being performed on lithium-ion batteries (LIB). Safety is a serious issue in the applications using high energy-density LIBs. A phenomenon known as thermal runaway (TR) is the major exothermal process that may cause a LIB's catastrophic failure. It is very important to predict TR conditions in order to prevent an uncontrollable chemical reaction caused by TR. For this purpose, a reliable model is needed. This paper constructs an electrochemical-thermal model, which includes the effects of the chemical reactions during TR, for a commercially available pouch L i F e P O4 (LFP) battery. A detailed analysis of the proposed models is performed and then validated against experimental results. Simulation results showed good agreement with the experimental data. The study presented here helps identify conditions at which TR may occur and provides a guide to the safe design of battery management systems. © 2023 IEEE.Conference Object Citation Count: 0Sizing of Series Hybrid Electric Vehicle with Hybrid Energy Storage System(Institute of Electrical and Electronics Engineers Inc., 2018) Ertan, Hulusi Bülent; Arikan,F.R.; Electrical-Electronics EngineeringThis work is aimed to develop a realistic design procedure for a series hybrid plug in vehicle, with a view to use it in a mathematical design optimization. The purpose of the optimization is minimizing the initial cost, as well as the running costs of the vehicle. Therefore there is a multi-objective design optimization problem in hand. Such problems are very suitable for mathematical optimization, however, accurate and not time consuming design procedure is a must, to obtain meaningful results. This paper introduces such a design procedure. The approach is illustrated on a commercial vehicle simulation model. The accuracy of the model is illustrated by comparing simulation results with vehicle test results. © 2018 IEEE.Conference Object Citation Count: 0Sizing of Series Hybrid Electric Vehicle with Hybrid Energy Storage System(Institute of Electrical and Electronics Engineers Inc., 2018) Ertan, Hulusi Bülent; Arikan,F.R.; Electrical-Electronics EngineeringThis work is aimed to develop a realistic design procedure for a series hybrid plug in vehicle, with a view to use it in a mathematical design optimization. The purpose of the optimization is minimizing the initial cost, as well as the running costs of the vehicle. Therefore there is a multi-objective design optimization problem in hand. Such problems are very suitable for mathematical optimization, however, accurate and not time consuming design procedure is a must, to obtain meaningful results. This paper introduces such a design procedure. The approach is illustrated on a commercial vehicle simulation model. The accuracy of the model is illustrated by comparing simulation results with vehicle test results. © 2018 IEEE.