Tekgün, Burak
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Burak Tekgün
Tckgun, Burak
Tekgun, Burak
Tckgun, Burak
Tekgun, Burak
Job Title
Doç. Dr.
Email Address
burak.tekgun@agu.edu.tr
Main Affiliation
02.05. Elektrik & Elektronik Mühendisliği
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Current Staff
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Sustainable Development Goals
13
CLIMATE ACTION
0
Research Products
17
PARTNERSHIPS FOR THE GOALS
0
Research Products
8
DECENT WORK AND ECONOMIC GROWTH
0
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
Research Products
12
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0
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16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
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11
SUSTAINABLE CITIES AND COMMUNITIES
2
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1
NO POVERTY
0
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6
CLEAN WATER AND SANITATION
1
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10
REDUCED INEQUALITIES
0
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14
LIFE BELOW WATER
1
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15
LIFE ON LAND
0
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5
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0
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4
QUALITY EDUCATION
0
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7
AFFORDABLE AND CLEAN ENERGY
12
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3
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0
Research Products
2
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0
Research Products
Documents
37
Citations
239
h-index
9
Documents
33
Citations
174
Scholarly Output
33
Articles
11
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933/564
Supervised MSc Theses
2
Supervised PhD Theses
2
WoS Citation Count
109
Scopus Citation Count
143
WoS h-index
6
Scopus h-index
6
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0
Projects
3
WoS Citations per Publication
3.30
Scopus Citations per Publication
4.33
Open Access Source
8
Supervised Theses
4
| Journal | Count |
|---|---|
| 7th International Conference on Electric Power and Energy Conversion Systems -- NOV 12-14, 2024 -- U ARAB EMIRATES | 2 |
| 6th International Conference on Electric Power and Energy Conversion Systems (EPECS) -- OCT 05-06, 2020 -- ELECTR NETWORK | 2 |
| 7th Global Power Energy and Communication Conference-GPECOM-Annual -- JUN 11-13, 2025 -- Bochum, GERMANY | 2 |
| IEEE 3rd Global Power, Energy and Communication Conference (IEEE GPECOM) -- OCT 05-08, 2021 -- ELECTR NETWORK | 2 |
| 6th Global Power, Energy and Communication Conference (GPECOM) -- JUN 04-07, 2024 -- Budapest, HUNGARY | 1 |
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Conference Object Citation - WoS: 5Citation - Scopus: 5Investigation of the Effects of Multi-Layer Winding Structures in Two Pole Synchronous Reluctance Machines(IEEE, 2021) Tekgun, Didem; Cosdu, Muhammed Muhsin; Tekgun, Burak; Alan, IrfanIn this paper, a comparative study is performed between single, various double, and triple-layer winding structures to investigate the effects of the winding MMF harmonics and end winding length on the two-pole synchronous reluctance machines (SynRM). A two-step design approach is used including winding and geometry optimization using multi-objective differential evolution (MODE) algorithm. In the first stage, a Pareto front is obtained which determines the number of turns for each coil group for all winding configurations. Later in the second stage, three results are selected from the first stage to perform a geometric optimization to distinguish the effects of the THD and end winding length on the synchronous performance of a 4 kW two-pole SynRM. For the same average torque output, efficiency, mass, and the torque ripple of the selected designs are investigated and compared. Based on the analysis, it is concluded that rather than focusing on shortening the end winding length, reducing the MMF harmonics have a more positive effect on the machine performance as reduced harmonics resulted in efficiency improvement up to 2 points and torque ripple is reduced up to 8 points while having similar motor mass.Doctoral Thesis Uzaktan Kontrollü İkincil Emisyon İyonizasyon Kalorimetri Modülleri ile Yüksek Enerjili Kozmik ve Gama Radyasyon Ölçümü(Abdullah Gül Üniversitesi, Fen Bilimleri Enstitüsü, 2024) Paran, Nejdet; Tekgün, Burak; Tıraş, EmrahThe demand for precise, robust, and reliable radiation-resistant particle detectors and ionization calorimeters intensifies, due to the escalating luminosity and unprecedented radiation conditions at particle colliders and accelerators. Secondary Emission (SE) Ionization Calorimetry is a novel technology designed to measure the energy of electromagnetic and hadronic particles, particularly in extreme radiation conditions. In this study, we have tested and investigated the development and radiation test of the novel SE modules. The modules were developed by modifying the conventional Hamamatsu single anode R7761 Photomultiplier Tubes. Three different voltage conditions for the same module were developed and the new modules were tested by using cosmic, gamma (Co-60) and neutron (AmBe) radiation sources. The results show that all three modes have good sensitivity to electromagnetic showers, and they are suitable for harsh radiation environments. This study also shows that SE module is a promising technology shedding light on future radiation-resistant nuclear and high-energy detectors. Here, we discuss the technical design, test characteristics and cosmic and particle interaction results of the newly developed SE modules. Since such detector systems are either in a high radiation area or in a closed room/box, remote mode changes allow us to continue the experimental process without interruption. By adding these signals to the interface where the modes are controlled, we can instantaneously observe the modes' effects.Research Project Alçaltıcı/Yükseltici Dc/Dc/Ac Eviricilerle Yüksek Performanslı Anahtarlamalı Relüktans Motoru Sürücü Sistemi Tasarımı Ve Gerçeklemesi(2021) Tekgün, Burak; Boynuegri, Ali Rifat; Yaşa , Yusuf; Alan, IrfanAnahtarlamalı relüktans motorları (ARM) 1800?lü yılların ortalarında keşfedilmesine rağmen, 1960?lı yıllarda yarı iletken anahtarların icat edilmesine kadar potansiyeli anlaşılamamış makinalardır. Modern yarı iletken teknolojisinin icadı ve gelişmesi ile birlikte ARM?lerin kullanımı yaygınlaşmıştır. ARM?ler basit yapıları, düşük üretim maliyetleri ve sağlamlıklarından dolayı birçok uygulamada tercih edilmişlerdir. Geleneksel olarak ARM, her bir faz için iki yarı iletken anahtar ve iki diyot kullanılarak oluşturulan sürücülerle sabit giriş gerilimi işlenerek, sırasıyla fazlar enerjilendirilmektedir. Faz sargılarındaki akımın enerjilendirilme esnasında yükselme süresi ve enerji kesildiği durumdaki akımın azalma süresi DC bara voltajına bağlıdır. Bu durum uygulamalarda enerjilendirme süresinin akımın sıfıra gitme süresi de göz önüne alınıp kısa tutulmasına, dolayısıyla komütasyon esnasında düşük tork üretimine, yüksek tork salınımına ve ortalama tork üretiminde azalmaya sebep olmaktadır. Bu projede, geleneksel sürücü topolojisinden farklı olarak ARM, bir DC/DC dönüştürücü ve tek fazlı bir tam-köprü evirici yardımı ile ideale yakın bir enerjilendirme akımı oluşturularak ARM daha yüksek performans ile kontrol edilmesi sağlanmıştır. Projede önerilen ARM sürücüsü her bir fazı bir DC/DC dönüştürücü ve bir tam-köprü evirici içeren modüler yapılı sürücülerden oluşmaktadır. Önerilen sürücü yapısını geleneksel ARM topolojilerinden ayıran özelliği DC/DC dönüştürücü devresidir. Burada makinanın faz sargılarının ihtiyaç duyduğu akım dalga şekli DC/DC dönüştürücü ile sağlanmaktadır. Tork üretiminin pozitif olabilmesi için stator ve rotor kutuplarının tam hizalandığı andan kısa bir süre önce negatif gerilim uygulanarak, faz akımının hızlı bir şekilde kesilmesi gerekmektedir. Bu durumda ise gerilim önerilen devredeki tam-köprü devresi yardımıyla tersine çevrilerek ve DC/DC dönüştürücünün çıkış gerilimi en yüksek seviyesine getirilmek suretiyle akımın hızlı şekilde sıfıra inmesi sağlanmıştır ve böylelikle makinanın performansı artmıştır. sadece DC/DC çevirici katında yüksek frekanslı anahtarlama olduğundan anahtarlama kayıplarının azalarak ve geleneksel topolojiye göre daha yüksek verim sağlanmıştır. Önerilen sürücü sisteminin AC motorların sürücüleri olarak yenilenebilir enerji sistemlerinde ara yüz elemanı olarak uygulanabilir olması, arıza giderme zamanında önemli ölçüde azalmaya neden olarak üretimdeki sürdürülebilirliğin artırılmasına destek olacağı öngörülmektedir.Article Citation - WoS: 1Citation - Scopus: 1Investigating the Tradeoff Between the MMF Distortion and End Turn Length of a 2-Pole Line Start SynRM Performance(Springer int Publ Ag, 2023) Tekgun, Didem; Cosdu, Muhammed M.; Tekgun, Burak; Alan, IrfanConventional 2-pole AC machine windings have long end windings and generate harmonics, which increase losses and reduce torque density. This study investigates the performance tradeoff between the level of distortion (THD) in winding magneto-motive force (MMF) and end turn length on a 2-pole line start Synchronous Reluctance Machine (LS-SynRM) machine. A two-stage approach is used, winding and geometry optimization. Various multilayer winding configurations having unevenly distributed number of turns are investigated. First, the percentage of the turns in a coil group is optimized for minimum harmonics and end turn length for all structures. Second, geometric optimization is performed on selected winding configurations. Sixteen different configurations are optimized, and Pareto optimal solutions are obtained. Later, these solutions are graded with a new score-based assessment method to quantify the quality of the results. It is concluded that the designs having lower THD in winding MMF perform better than the designs with shorter end turns in terms of efficiency and torque density.Conference Object Citation - WoS: 1Citation - Scopus: 1LLC Laser Driver for Laser Wireless Power Transfer Application(IEEE, 2024) Yigit, Hayri; Boynuegri, A. Rifat; Tekgun, BurakLaser Wireless Power Transfer (LWPT) represents a cutting-edge technology for the long-range transmission of energy, distinguished by its capability for high-power transfer and adaptability to mobile applications. The effectiveness of this system is significantly tied to its transmitter component, comprising the Laser Diode (LD) and its associated driving circuitry. This research address to enhance system efficiency by introducing a specially designed LLC converter circuit, aimed at improving the overall efficiency of both the driver circuit and the LD driving process while minimizing current ripple. The proposed circuit underwent comprehensive simulation using MATLAB/SIMULINK, resulting in noteworthy outcomes that showcased an impressive efficiency of 98.44% within the LD driver circuit.Article Design and Real-Time Implementation of a Sliding Mode Observer Utilizing Voltage Signal Injection and PLL for Sensorless Control of IPMSMs(Elsevier - Division Reed Elsevier India Pvt Ltd, 2024) Ates, Ertugrul; Tekgun, Burak; Ablay, Gunyaz; Barut, MuratIn this study, a sliding mode observer (SMO) based on high-frequency (HF) voltage signal injection and a phase-locked loop (PLL) is proposed for estimating the extended electromotive force (EEMF), rotor position, and rotor velocity of an interior permanent magnet synchronous machine (IPMSM). This approach addresses real-time estimation challenges associated with standard SMO and PLL at very low speeds and standstill. A reliable and accurate sensorless speed control system for IPMSM is then developed and implemented in real time using the proposed SMO and PLL, covering a wide range of speeds, including low-speed and standstill conditions. The SMO effectively estimates the EEMF, while the PLL extracts the rotor velocity and position based on these estimates. Compared to conventional SMO and PLL methods, real-time results from an 8-pole, 0.4 kW IPMSM demonstrate the superior efficiency of the proposed system.Article Citation - WoS: 1Citation - Scopus: 2Investigating the Role of Stator Slot Indents in Minimizing Flooded Motor Fluid Damping Loss(MDPI, 2023) Tekgun, Didem; Tekgun, BurakThis research examines how fluid damping loss affects the operation of a two-pole, 5.5 HP (4 kW) induction machine (IM) within the context of different slot opening configurations developed for downhole water pump applications. Since these motors operate with their cavities filled with fluid, the variations in fluid viscosity and density, compared to air, result in the occurrence of damping losses. Furthermore, this loss can be attributed to the motor's stator and rotor surface geometry, as the liquid within the motor cavity moves unrestrictedly within the motor housing. This study involves the examination of the damping loss in a 24-slot IM under different stator slot indentations. The investigation utilizes computational fluid dynamics (CFD) finite element analysis (FEA) and is subsequently validated through experiments. The aim of this work is to emphasize the significance of fluid damping loss in submerged machines. Results reveal that the damping loss exceeds 8% of the motor output power when the stator surface has indentations, and it diminishes to 3.2% of the output power when a custom wedge structure is employed to eliminate these surface indentations.Conference Object Citation - WoS: 5Citation - Scopus: 5Design and Control of a Single Phase DC/Rectified AC/AC Inverter for Low THD Applications(Institute of Electrical and Electronics Engineers Inc., 2018) Tekgun, Burak; Tekgun, Didem; Alan, İrfan; Badawy, Mohamed O.In this paper, a single phase DC/Rectified AC/AC (DC/RAC/AC) inverter is analyzed and compared to classical single phase PWM inverters. A traditional AC power supply (PS) system consists of a DC/DC converter, a cascaded H-bridge inverter, and a passive filter to generate the sinusoidal output voltage. The presented DC/RAC/AC inverter has a similar structure; however, the control of the cascaded units differ. The presented method generates rectified sine wave at the output of the DC/DC converter unit and the H-bridge inverter alternates the rectified sine wave to generate the full sine wave without having an additional output filter; hence, the switching losses at the H-bridge inverter is limited to the line frequency (50-60 Hz). Moreover, the bulk DC bus capacity at the output of the DC/DC converter is reduced significantly. Therefore, the power consumed by the passive elements are minimized. The circuit modes of operation are analyzed and the system is simulated in Matlab/Simulink environment for both traditional and proposed topologies. Results show that the proposed system is superior to the traditional one in terms of efficiency, generated THD with a simplified control structure, and it offers a reduced system size and cost. © 2019 Elsevier B.V., All rights reserved.Conference Object Citation - Scopus: 1Four Switch Buck-Boost Quasi Single-Stage Inverter With Smooth Mode Transition Using Three-Mod Modulation Technique(IEEE, 2024) Keskinkilic, Ebubekir; Tckgun, BurakQuasi-single-stage inverters (QSSI) attract attention due to their simple structure and bidirectional operation capability. However, in the buck-boost DC-DC conversion stage, smooth transition, and efficient conversion cannot be achieved when the output voltage is close to the input voltage with the traditional two-mode control method. This is due to the pulse width ratio limitations, and non-idealities of the active and passive components. In this paper, a comparative analysis of the mode transition techniques in QSSIs is presented using methods available for DC/DC converters. The system efficiency and output voltage signal quality are selected as the performance metrics as they are important performance parameters in many applications. A 2kW QSSI is controlled using single-mode, two-mode, and three-mode modulation techniques. Simulation and experimental studies are conducted for validation. Based on these studies, it is concluded that the single-mode modulation technique performed the best in eliminating dead zone effects and reducing total harmonic distortion (THD), whereas the two-mode modulation technique achieved the highest system efficiency. The three-mode modulation has superior performance on dead zone elimination compared to the two-mode modulation and better system efficiency than the single-mode modulation method. Experimental results indicate that the three-mode modulation achieved an efficiency of 91.12% with a THD of 3.73%.Conference Object Citation - Scopus: 2Effect of the Stator Slot Indents on Fluid Damping Loss in Submersible Pump Applications(IEEE, 2022) Tekgun, Didem; Cosdu, Muhammed Muhsin; Tekgun, Burak; Alan, IrfanIn this study, the effect of fluid damping on the performance of a 2-pole, 4-kW line start synchronous reluctance machine (LS-SynRM) with different slot opening structures for submersible water pump applications is investigated. Since the submersible pump motors run inside a fluid-filled environment and the fluid viscosity and density differ from the air, it causes an increased damping effect comparing air-filled machines. Hence, a non-negligible damping loss occurs. In this study, the damping effects of the fluids in a 24 slot LS-SynRM for various stator slot indentations are investigated with computational fluid dynamics (CFD) finite element analysis (FEA) to highlight the importance of the fluid damping loss in flooded machines. Results show that the damping loss can go as high as 10% of the motor output power when the stator surface has indentations, and this loss can be cut down to 3.5 % when the surface indentations are eliminated with custom no-slotting wedge structures.
