Yazar "Mollahasanoğlu, Hakkı" için listeleme
-
Comparative implementation of thermoelectric coolers in transformer cooling
Tören, Murat; Mollahasanoğlu, Hakkı (Taylor & Francis Ltd., 2023)In this study, using a comprehensive experimental methodology, thermoelectric coolers (TECs) are used for transformer cooling in contrast to classical methods such as air, oil, and water. The effects of this operation are ... -
Comparative study of single-phase multilevel cascaded transformerless inverters with different modulation methods
Mollahasanoğlu, Hakkı; Mollahasanoğlu, Merve; Özkop, Emre (Elsevier, 2024)This paper presents an in-depth exploration of a single -phase multilevel cascaded H5 (CH5) transformerless inverter employing both phase-shifted PWM (PS-PWM) and level-shifted PWM (LS-PWM) methodologies. A comparative ... -
Comparison of heuristic approaches in weight optimization of different power levels transformers
Tören, Murat; Mollahasanoğlu, Hakkı (Taylor & Francis Ltd., 2022)In this study, the weight of distribution type transformers and power transformers, which are used extensively in the industry, is optimized. A heuristic approach that uses the Firefly algorithm, Ant Colony algorithm, and ... -
Elektrikli ve hibrit araçlardaki elektrik motorlarının içten yanmalı motorlarda oluşan 〖CO〗_2 emisyonunda meydana getireceği değişimin tahmini ve verimliliğe etkisi: Türkiye örneklemesi
Tören, Murat; Mollahasanoğlu, Hakkı (TUBİTAK Scientific & Technical Research Council Turkey, 2022)Günümüzde, artan hava kirliliği sorunu, iklim değişikliği, petrol rezervlerinin hızlı tükenmesi ve pahalı olması, ulaşım sektöründe çevre dostu, verimli ve sürdürülebilir çalışmaların artmasına neden olmaktadır. Bu sebeple, ... -
Enhancing magnetic levitation and guidance force and weight efficiency of high-temperature superconducting maglev systems by using sliced bulk YBCO
Abdioğlu, Murat; Öztürk, U. Kemal; Güner, Sait Barış; Öztürk, Mehmet; Mollahasanoğlu, Hakkı; Yanmaz, Ekrem (Wiley, 2023)We aimed to enhance the magnetic force efficiency of Maglev systems without increasing total weight. For this aim, we divided YBCO bulks into three slices horizontally to utilize the YBCO-permanent magnetic guideway (PMG) ... -
Evaluation of three-phase neutral-point-clamped PFC rectifier implemented with isolated DC-DC converters for EV fast charger
Mollahasanoğlu, Merve; Mollahasanoğlu, Hakkı; Okumuş, Halil İbrahim (Pamukkale University, 2024)In this study, a three-phase AC/DC neutral point clamped (NPC) power factor corrected (PFC) multilevel converter for off-board chargers of Electric Vehicles (EVs) is evaluated. The rectifier analysis has been tested by ... -
Experimental and simulated investigation of a single-phase transformerless H5 inverter topology
Mollahasanoğlu, Hakkı; Özkop, Emre (Tafila Technical University, 2024)This paper aims to simulate and experimentally apply a single-phase transformerless H5 inverter topology. The H5 inverter topology is simulated in MATLAB/Simulink environment as both off-grid and grid-connected. The ... -
Extended 2-D magnetic field modeling of linear motor to investigate the magnetic force parameters of high-speed superconducting maglev
Öztürk, Ufuk Kemal; Abdioğlu, Murat; Özkat, Erkan Caner; Mollahasanoğlu, Hakkı (IEEE, 2023)A 2-D numerical finite-element model of a linear synchronous motor (LSM) is extended based on the magnetic field and moving mesh properties to investigate the magnetic flux and magnetic force characteristics of the high-speed ... -
Gri Kurt optimizasyon algoritması ile güç ve dağıtım türü transformatörlerin ağırlık optimizasyonu
Tören, Murat; Mollahasanoğlu, Hakkı (2023)Elektromanyetik alan yoluyla elektrik enerjisinin aktarılması prensibine göre çalışan transformatörler, yüksek verimliliğe sahip elektrik makinalarıdır. Transformatörün verimliliğini etkileyen ağırlık ve boyut parametreleri, ... -
Investigation of the effect of different power degree NdFeB magnets used in interior permanent magnet brushless direct current motor (IPMBLDC) on motor performance
Tören, Murat; Mollahasanoğlu, Hakkı (Gazi Üniversitesi, 2023)Purpose: In this study, it is aimed to determine the effects of magnets used in BLDC motors on the motor performance of NdFeB type magnets with different power densities at different temperatures. Theory and Methods: The ... -
Investigation of thermoelectric cooler system effect on induction motor performance
Tören, Murat; Mollahasanoğlu, Hakkı (Institute of Electrical and Electronics Engineers Inc., 2021)Induction motors are generally cooled by the fan connected to the motor shaft, as the cooling of electrical machines is important. In this study, an alternative method is proposed for cooling of induction motors. Thermoelectric ... -
Magnetic force performance of hybrid multisurface HTS maglev system with auxiliary onboard PMs
Öztürk, Ufuk Kemal; Abdioğlu, Murat; Mollahasanoğlu, Hakkı (IEEE, 2023)The vertical levitation force, guidance force, and magnetic stiffness values, and thus the loading capacity and movement stability of high-temperature superconducting (HTS) Maglev systems, are aimed to be increased in this ... -
New modified carrier-based level-shifted PWM control for NPC rectifiers considered for implementation in EV fast chargers
Mollahasanoğlu, Merve; Mollahasanoğlu, Hakkı; Okumuş, H. İbrahim (TUBİTAK Scientific & Technical Research Council Turkey, 2023)In this study, the aim is to evaluate three-phase (3ϕ) AC/DC neutral point-clamped (NPC) power factor-corrected (PFC) multilevel converter performance for electric vehicle (EV) fast chargers. Power factor correction for ... -
A new PWM technique for three-phase three-level neutral point clamped rectifier
Mollahasanoğlu, Merve; Mollahasanoğlu, Hakkı; Okumuş, Halil İbrahim (Springer, 2023)In this study, the aim is to evaluate three-phase (3 phi) three-level (3L) neutral point clamped AC/DC rectifier for high-power applications. The rectifier analysis has been simulated using a new modified carrier-based ... -
Termoelektrik soğutucuların yağlı tip dağıtım transformatörlerinin faydalı ömürlerine etkisinin incelenmesi
Tören, Murat (2022)Elektrik enerjisinin iletim ve dağıtım sistemleri içerisinde aktif rol alan transformatörlerin, endüstriyel sahada sayıca fazla kullanım alanına sahip türü, dağıtım transformatörleridir. Bu transformatörler kullanıldıkları ...
