Ertan, Hulusi Bülent
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Bülent Ertan H.
Ertan, HB
Ertan,H.B.
Ertan, H. B.
E.,Hulusi Bülent
Ertan, Hulusi Bulent
H.,Ertan
Bulent Ertan H.
ERTAN, HB
H. B. Ertan
H., Ertan
Ertan, H. Bulent
Hulusi Bulent, Ertan
Hulusi Bülent, Ertan
Ertan, Hulusi Bülent
E.,Hulusi Bulent
H.B.Ertan
E., Hulusi Bulent
Ertan H.
E., Hulusi Bülent
Bulent Ertan,H.
Ertan, HB
Ertan,H.B.
Ertan, H. B.
E.,Hulusi Bülent
Ertan, Hulusi Bulent
H.,Ertan
Bulent Ertan H.
ERTAN, HB
H. B. Ertan
H., Ertan
Ertan, H. Bulent
Hulusi Bulent, Ertan
Hulusi Bülent, Ertan
Ertan, Hulusi Bülent
E.,Hulusi Bulent
H.B.Ertan
E., Hulusi Bulent
Ertan H.
E., Hulusi Bülent
Bulent Ertan,H.
Job Title
Profesor Doktor
Email Address
bulent.ertan@atilim.edu.tr
Main Affiliation
Electrical-Electronics Engineering
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Scopus Author ID
Turkish CoHE Profile ID
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WoS Researcher ID
Sustainable Development Goals
7
AFFORDABLE AND CLEAN ENERGY
13
Research Products
Scholarly Output
26
Articles
3
Citation Count
26
Supervised Theses
2
26 results
Scholarly Output Search Results
Now showing 1 - 10 of 26
Conference Object An Approach for Improving Performance of Sensorless Field Control(Ieee, 2018) Ertan, H. Bulent; Filci, Tayfun; Electrical-Electronics EngineeringSensorless vector control is preferred in some applications, because there is no need for speed or position sensor. However, by their very nature, they are susceptible to making position error in rotor position estimation. As a consequence the performance of motor drives employing this technology is lower than those which employ sensors. This paper presents a new approach which identifies and uses rotor slot harmonic current component in the stator current to identify rotor position. The time taken by the algorithm used is short enough to be embedded within the vector control algorithm. The essence of the algorithm is treating the current component due to rotor slot harmonics as an amplitude modulated signal on the fundamental current component. The magnitude of this current component is identified via demodulation. Using this information rotor position and speed can be determined. This approach is tested on a commercial induction motor and some results are presented which illustrate that rotor position can be successfully determined.Article Citation - WoS: 15Citation - Scopus: 15A Model for the Prediction of Thermal Runaway in Lithium-Ion Batteries(Elsevier, 2024) Azuaje-Berbeci, Bernardo J.; Ertan, H. Bulent; Electrical-Electronics EngineeringThe increasing popularity of electric vehicles is driving research into lithium -ion batteries (LIBs). Thermal runaway (TR) in LIBs is a serious concern for the safe operation of these high-energy-density batteries that is yet to be overcome. A reliable model is needed to predict voltage variation, heat generation, temperature rise, and the process leading to TR of a LIB battery under its operating conditions (charging-discharging). Such a model can be used to design battery packs more resilient to thermal runaway or assess how a battery pack would perform under hazardous conditions. Furthermore, it can be used for generating a warning signal if there is a possibility of the battery going towards TR. This paper presents an approach to solving this problem, which is not currently well addressed in the literature. The approach adopted in this paper is based on a numerical analysis of a multilayered electrochemical-thermal model of LIB. Tuning the parameters of a LIB for accurate results from this numerical model is presented, as well as the details of the approach in the paper. Experiments are performed under several LIBs, and their voltage and surface temperature variations are measured under various operating conditions, including thermal runaway. The results of the experiments are compared with the predictions of the numerical simulations. An excellent agreement is observed with the experimental results, proving the accuracy of the proposed approach. This approach can be configured to give results in a few minutes. The paper also discusses how the developed approach can be used to create a TR warning during operating conditions or to change the mode of operation of a LIB before a hazard occurs.Conference Object Driving Conditions Leading To Thermal Runaway in Li-Ion Battery EV's(IEEE, 2024) Ertan, H. Bulent; Azuaje-Berbeci, Bernardo J.; Electrical-Electronics EngineeringThe adoption of high-energy-density lithium-ion batteries (LIB) as the energy source in electric vehicles (EV) introduces significant safety concerns. Thermal runaway (TR), a self-accelerating rise in battery temperature resulting in catastrophic failure, is a significant safety concern. Cooling system failure within the EV's thermal management system is one of several factors that can trigger TR. Typically, TR is initiated by exceeding a critical temperature threshold under abusive conditions. Understanding the operating conditions that lead to the path of TR is essential for ensuring EV and occupant safety. Recently, a detailed electrochemical-thermal model that incorporates the chemical reactions within the battery until TR is introduced. This paper aims to illustrate how this model can be used to identify the conditions leading to TR under realistic EV driving scenarios. For this purpose, an Advisor/Matlab-based model of a hybrid EV is developed and verified by tests, is used to estimate the current required from the vehicle's battery pack at a given driving condition. This is followed by the prediction of battery thermal response using the mentioned finite-element-analysis-based battery model. Several scenarios are tested in this paper to determine whether TR occurs and to identify the factors contributing to TR. This study aids in comprehending the factors that contribute to TR and the development of preventative measures for battery management system design.Conference Object Citation - Scopus: 3Comparison of a Magnetically Geared Pm Wind Generator With Radial Flux Generator(Institute of Electrical and Electronics Engineers Inc., 2018) Zeinali,R.; 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 - Scopus: 4Magnetically geared direct drive wind generator thermal analysis(Institute of Electrical and Electronics Engineers Inc., 2017) Zeinali,R.; 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.Editorial Acemp-Optim 2019 Opening Speech(Institute of Electrical and Electronics Engineers Inc., 2019) Bulent Ertan,H.; Electrical-Electronics Engineering[No abstract available]Conference Object Citation - WoS: 1Fem-Based Design Modifications and Efficiency Improvements of a Brushed Permanent Magnet Dc Motor(Ieee, 2017) Tarvirdilu-Asl, Rasul; Zeinali, Reza; Ertan, H. Bulent; 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.Conference Object Citation - WoS: 2Magnetically Geared Direct Drive Wind Generator Thermal Analysis(Ieee, 2017) Zeinali, Reza; Ertan, H. Bulent; Yamali, Cemil; Tarvirdilu-Asl, Rasul; 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.Conference Object Citation - Scopus: 1Sizing of Series Hybrid Electric Vehicle With Hybrid Energy Storage System(Institute of Electrical and Electronics Engineers Inc., 2018) Ertan,H.B.; 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.Article Citation - Scopus: 2An Approach for Performance Prediction of Saturated Brushed Permanent Magnet\rdirect Current (dc) Motor From Physical Dimensions(Tubitak Scientific & Technological Research Council Turkey, 2022) Asl, Rasul Tarvirdilu; Zeinali, Reza; Ertan, Hulusi Bulent; Electrical-Electronics EngineeringAn analytical approach for performance prediction of saturated brushed permanent magnet direct current\r(DC) motors is proposed in this paper. In case of a heavy saturation in the stator back core of electrical machines, some\rflux completes its path through the surrounding air, and the conventional equivalent circuit cannot be used anymore.\rThis issue has not been addressed in the literature. The importance of considering the effect of the flux penetrating\rthe surrounding air is shown in this paper using finite element simulations and experimental results, and an analytical\rapproach is proposed to consider this effect on magnet operating point determination and performance prediction of\rsaturated brushed permanent magnet DC motors. An analytical method is also presented to determine the boundary\rradius of the surrounding air for obtaining accurate results in finite element (FE) solutions and analytical calculations.\rAn analytical approach based on Carter’s coefficient is also proposed to calculate the effective length of the magnet when\rthe length of the magnet and rotor length are not the same. The accuracy of the proposed analytical model is illustrated\rusing finite element simulations and experimental results. With this accuracy, this analytical model is very suitable to\rbe used for reliable and quick mathematical design optimization.
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