Browsing by Author "Tekgun, Burak"

Now showing 1 - 20 of 24

Citation - WoS: 17
Citation - Scopus: 27
Core Loss Estimation in Electric Machines With Flux-Controlled Core Loss Tester
(IEEE-Inst Electrical Electronics Engineers Inc, 2019) Tekgun, Burak; Sozer, Yilmaz; Tsukerman, Igor; Upadhyay, Parag; Englebretson, Steven; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
The complexity of core loss estimation is a serious challenge in the design of high-efficiency electric machines. Current estimation methods based on the Steinmetz equation and loss separation are not accurate enough, even at the rated conditions. This paper describes a loss estimation technique combining finite-element analysis (FEA) and actual core loss measurements. First, flux density waveforms in various parts of the electric machine are determined using FEA. Second, the same waveforms are generated in a wound toroidal core made of the same material as used in the machine. The loss is measured per unit mass, and then the total motor core loss is calculated by integrating the measured W/kg loss values for predefined sections of the motor. These estimation results are compared with those of the Bertotti method. The proposed procedure is shown to improve the accuracy of loss estimation.
Dalgıç Pompa Uygulamaları İçin Doğrudan Yol Vermeli Senkron Relüktans Motorunun Tasarım Optimizasyonu Ve Gerçeklemesi
(ELEKTRİK, ELEKTRONİK VE ENFORMATİK ARAŞTIRMA DESTEK GRUBU GRUBU: EEEAG, 2023) Tekgun, Burak; Alan, Irfan; Tekgun, Didem; 0000-0003-2720-8816; 0000-0001-7995-0540; AGÜ, Mühendislik Fakültesi, Elektrik - Elektronik Mühendisliği Bölümü; Tekgun, Burak; Alan, Irfan; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
Günümüzde doğal kaynakların korunması ve enerji maliyetlerinin düşürülmesi için enerji kayıplarının azaltılması ortak bir amaç olarak görülmektedir. Elektrik tahrik sistemlerinin küresel enerji tüketiminin yaklaşık %40?ını oluşturduğu düşünüldüğünde elektrik makinalarının verimlerinin artırılması ile sağlanacak avantajların hem ülke bazında hem de evrensel olarak büyük bir öneme sahip olduğu görülmektedir. Uygulama odaklı olarak bakıldığında yer altından su, petrol vb. çıkarmakta kullanılan pompa motorlarının endüstride kullanılmakta olan motorlar arasında oldukça büyük bir paya sahip olduğu görülmektedir. Özellikle dalgıç pompa uygulamalarında kullanılmakta olan pompa motorları gerek motor tasarım hatalarından, gerekse de yanlış motor-pompa konfigürasyonları seçiminden kaynaklanan hatalar nedeniyle çok düşük verimlerle çalışmaktadır. Sağlamlık, ucuzluk ve doğrudan yol verme gibi özelliklerinden dolayı pompa uygulamalarında genellikle indüksiyon motorları (İM) tercih edilmektedir. Fakat İM?lerin en büyük sorunu özellikle küçük ve orta güçte düşük enerji verimi ile çalışmalarıdır. Doğrudan yol vermeli sürekli mıknatıslı motorlar (DY-SMSM) yüksek güç yoğunluğuna sahip olmaları sebebiyle verimi yükseltmek adına İM?lere uygun bir alternatiftir. Fakat bu makinalarda doğrudan yol verme esnasında mıknatısların demagnetizasyonu ve en önemlisi doğada nadir bulunan mıknatısların kullanımından kaynaklı yüksek maliyet ve dışa bağımlılık sorunları araştırmacıları bu makinalara yeni bir alternatif arayışı içine itmektedir. Bu doğrultuda hem doğrudan yol verme özelliği hem de mıknatıs içermeyen yapısı ile doğrudan yol vermeli senkron relüktans motorlar (DY-SenRM) İM?lere uygun bir alternatif olarak karşımıza çıkmaktadır. En basit tanımla bu tip motorlar çalışma prensibi bakımından relüktans motor ve İM?nin bir kombinasyonudur. DY-SenRM?de makinanın rotoruna uygun şekilde gömülen rotor barları ile doğrudan yol verme özelliği kazandırılırken, İM?lerin aksine rotor bakır kayıpları sürekli rejimde sıfıra indirilmektedir. Dahası SenRM?ler İM?lere kıyasla daha yüksek güç ve moment yoğunluğuna sahiptir. SenRM?lerin dezavantajlarına bakıldığında düşük güç faktörü ile çalışma ve rotordaki açıklıklardan kaynaklı yapısal entegrasyon problemleri göze çarpmaktadır. Bu problemler tasarım aşamasında iyi incelenip gerekli önlemler alınmalıdır. Gerekli olduğu durumlarda nadir element bulundurmayan mıknatısların kullanımı güç faktörü sorununu ortadan kaldırdığı gibi verimi de artırmaktadır. Bu projede dalgıç pompaları için 4 kW gücünde DY-SenRM tasarımı üzerine çalışılacaktır. Özellikle sulama amaçlı üretilen yer altı pompa sistemlerinde en çok tercih edilen 6 inç çapındaki dalgıç pompalarına uygun, yüksek verimli 4 kW gücünde bir DY-SenRM?nin tasarım optimizasyonunun yapılması ve gerçeklemesi amaçlanmaktadır. Optimizasyon algoritması olarak çoklu amaç diferansiyel evrim algoritması, benzerlerine göre öne çıkan hızlı yakınsama ve doğru sonuçlara ulaşma özellikleri göz önüne alınarak seçilmiştir. Tasarlanacak DY-SenRM?nin geçici rejim performansı, senkronize olabilme yeteneği, senkron çalışma performansı ve boyutu optimizasyonda göz önüne alınacak metriklerdir. Bu çalışmanın başarıyla sonuçlanması ile DY-SenRM?nin sadece pompa uygulamaları değil, diğer sabit hız uygulamalarında da düşük verimli İM?lerin yerini alması; dolayısıyla düşük maliyetli, yüksek verimli motor teknolojisinin yaygın hale gelmesi ön görülmektedir.
Citation - WoS: 5
Citation - Scopus: 5
Design 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.; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
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.
Design and Optimization of an Outer Rotor Spoke Type PMSM With Improved Saliency for a Lightweight Racing Vehicle
(IEEE, 2024) Karatepe, Hasan Can; Tekgun, Burak; Tekun, Diclem; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
This paper presents the design and optimization of an outer rotor spoke-type permanent magnet synchronous motor, aimed at achieving high torque density. The improvement is accomplished by enhancing the saliency through a center shift of the rotor arc, while simultaneously minimizing cogging torque and torque ripple. The proposed design is optimized for an electro-mobile that will participate in TEKNOFEST's "Efficiency Challenge". A vehicle dynamics simulation with the parameters of the designed vehicle was done under the "New European Driving Cycle" (NEDC) to determine the required torque and speed values using MATLAB's "Virtual Vehicle Composer" application. The multi-objective differential evolution (MODE) algorithm was chosen for optimization and further altered for maximum torque per ampere (MTPA) angle sweep, since each optimization individual would have a different MTPA angle. The optimization was conducted with 40 generations and 522 individual designs. An optimal solution from the Pareto-Front was selected and its performance was investigated using the 2D finite element analysis (FEA).
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, Murat; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
In 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.
Citation - Scopus: 10
Design Optimization of an Outer Rotor PMSM for a Drive Cycle Using an Improved Mode Algorithm for a Lightweight Racing Vehicle
(Institute of Electrical and Electronics Engineers Inc., 2020) Coşdu, Muhammed Muhsin; Hacan, Ahmet Furkan; Tekgun, Burak; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
Hub motors are widely used for light-weight electric drives. The aim of this paper is to design a highly efficient out-runner permanent magnet synchronous motor (PMSM) for a specific drive cycle in order to use it in an electro mobile contest called the 'Efficiency Challenge'. A multiobjective differential evaluation (MODE) algorithm is used to obtain a variety of different design options. The MODE algorithm is altered to incur less computational cost and yield better-distributed results in a comparison with traditional MODE. The alteration is performed in five different aspects: Pareto Front, Selection Algorithm, Population Size, Scaling Factor, and Rectification. The objectives for differential evaluation optimization are minimizing the motor mass and maximizing efficiency for the target drive cycle. The voltage limit and the torque ripple are defined as constraints. The optimization algorithm is written in MATLAB and the finite element analysis (FEA) is conducted in ANSYS/Maxwell 2D. The modified MODE algorithm is optimized for the PMSM with 100 generations and 3282 candidate designs. A well-distributed Pareto optimal solution set is obtained, and a suitable design is selected to be manufactured. © 2022 Elsevier B.V., All rights reserved.
Citation - WoS: 9
Design Optimization of an Outer Rotor Pmsm for a Drive Cycle Using an Improved Mode Algorithm for a Lightweight Racing Vehicle
(IEEE, 2020) Cosdu, Muhammed Muhsin; Hacan, Ahmet Furkan; Tekgun, Burak; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
Hub motors are widely used for light-weight electric drives. The aim of this paper is to design a highly efficient out-runner permanent magnet synchronous motor (PMSM) for a specific drive cycle in order to use it in an electro mobile contest called the "Efficiency Challenge". A multiobjective differential evaluation (MODE) algorithm is used to obtain a variety of different design options. The MODE algorithm is altered to incur less computational cost and yield better-distributed results in a comparison with traditional MODE. The alteration is performed in five different aspects: Pareto Front, Selection Algorithm, Population Size, Scaling Factor, and Rectification. The objectives for differential evaluation optimization are minimizing the motor mass and maximizing efficiency for the target drive cycle. The voltage limit and the torque ripple are defined as constraints. The optimization algorithm is written in MATLAB and the finite element analysis (FEA) is conducted in ANSYS/Maxwell 2D. The modified MODE algorithm is optimized for the PMSM with 100 generations and 3282 candidate designs. A well-distributed Pareto optimal solution set is obtained, and a suitable design is selected to be manufactured.
Development and Radiation Test of a Secondary Emission Ionization Calorimetry Module
(Pergamon-Elsevier Science Ltd, 2025) Paran, Nejdet; Tiras, Emrah; Tekgun, Burak; Abubakar, Saleh; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
The 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 tests of the novel SE modules. The modules were developed by modifying the conventional Hamamatsu single-anode R7761 Photomultiplier Tubes (PMTs). Three different voltage conditions for the same module were created and the new modules were tested using cosmic and gamma radiation sources, Co-60. The results show that all three modes have good sensitivity to electromagnetic showers, and they are suitable for harsh radiation environments. This study also indicates that the 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.
A Dithered Carrier Level Shifted Sine Pulse Width Modulation Technique for EMI Reduction in Cascaded H-Bridge Multi-Level Inverters
(IEEE, 2025) Unal, Semih; Tekgun, Burak; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
Growing utilization of high-power equipment, particularly in renewable energy systems and electric vehicle applications, has increased the popularity of multi-level inverters (MLI), owing to their capacity to produce high-fidelity sine wave output, compactness, and readily modifiable control devices. Electromagnetic Interference (EMI) is a prevalent problem associated with MLI topologies. Passive EMI filters can easily eliminate this problem. Still, the bulky components used inside these filters lead to a rise in the system's overall size, weight, and production cost. This work presents a novel modulation technique called dithered carrier level shifted sine pulse width modulation (DCLS-SPWM) with the target of reducing electromagnetic interference in cascaded H-bridge multi-level inverters (CHB-MLIs). This method reduces EMI by diffusing harmonics, typically concentrated in lower frequency bands, into higher stages. In the case of DCLS-SPWM, the carrier signal frequency is dithered over a time interval while maintaining the same overall number of switching events. This destabilizes the steady-state conditions intrinsic to the modulation, resulting in a more uniform harmonic distribution. In this study, a 9-level CHB-MLI simulation is built using MATLAB-Simulink, where each module receives a 100V DC input. The efficacy of the proposed DCLS-SPWM method on harmonic reduction is analyzed and validated.
Citation - Scopus: 2
Effect of the Stator Slot Indents on Fluid Damping Loss in Submersible Pump Applications
(IEEE, 2022) Tekgun, Didem; Cosdu, Muhammed Muhsin; Tekgun, Burak; Alan, Irfan; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
In 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.
Citation - WoS: 9
Citation - Scopus: 9
FEA Based Fast Topology Optimization Method for Switched Reluctance Machines
(Springer, 2022) Tekgun, Didem; Tekgun, Burak; Alan, Irfan; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
In this paper, a finite element analysis (FEA) based fast optimization method to optimize a lightweight in-wheel switched reluctance machine is presented. This method speeds up the switched reluctance machine optimization procedure by running the FEA simulations with single-phase constant current excitations for half electrical cycle and estimating the machine performance metrics using the gathered FEA data. Hence, the machine`s dynamic performance estimation process takes shorter for each design candidate. The optimization algorithm employs designs of experiments (DOE), response surface (RS) analysis method, and differential evolution algorithm (DE). Here, the DOE method is used to reduce the search space by narrowing down the upper and lower boundaries of each design variable based on the RS analysis. Although this process does not guarantee getting the Pareto front, it places the search space close to the actual one. Hence, the multi-objective DE optimization finds the Pareto optimal solution set without requiring a large number of iterations as well as a large number of candidate designs for each iteration. The method is applied to a 24/16 SRM that is intended to be used in a lightweight race car as a hub motor. Six dimensionless geometric variables are optimized to satisfy three objective functions, namely torque ripple, motor mass, and copper loss. While the conventional DE takes at least 3000 candidate designs, the proposed method considers only 559 designs to reach a similar Pareto front. It is observed that the proposed method takes about 6 h 30 min compared to the conventional method that takes 32 h 50 min using the same computer. Therefore, the computation time is reduced almost five times with the proposed method.
In-Pipe Electrical Machine Design for Smart Clean Water Grid Monitoring and Control Stations
(IEEE, 2025) Erkan, Murat; Boynuegri, Ali Rifat; Tekgun, Burak; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
This study presents the design of an electric machine intended to supply the electrical energy required for the operation of electronic devices and mechanical equipment that form part of a clean water smart grid network powered by renewable energy sources. The proposed machine is a permanent magnet synchronous generator (PMSG), specifically designed to operate under realistic physical and hydraulic conditions within clean water distribution infrastructure. The in-pipe turbine responsible for driving the rotor of the generator was selected based on findings from a symposium paper identified through a comprehensive literature review. The daily energy requirements of the smart grid's electronic and industrial mechanical components were both theoretically estimated and experimentally validated, leading to the selection of a suitable energy storage unit. Pressure data from the clean water distribution line located on the street of the design office was measured and recorded at one second intervals over a 24-hour period. Using this dataset, the optimal hydraulic conditions and time frame for battery charging were identified from the pressure-time profile. A representative duty cycle was then defined, and the performance analysis of the in-pipe permanent magnet synchronous generator was carried out accordingly.
Citation - WoS: 7
Citation - Scopus: 9
Instantaneous Torque Error Compensation Based Online Torque Sharing Function for Switched Reluctance Machines
(Elsevier, 2023) Genc, Ufuk; Tekgun, Burak; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
An online torque sharing function (TSF) with instantaneous torque error compensation method for switched reluctance machines is proposed to maintain a minimized ripple operation. The proposed method adjusts the shared torque between the phases based on instantaneous torque error different than the existing TSF methods formulated with a mathematical expression. The objective of this approach is to benefit from the outgoing phase torque as it has slow current dynamics due to the high inductance. Also, the incoming phase is turned on as soon as it can generate positive torque. During this process, the total torque is estimated instantaneously using lookup tables, and a correction current is calculated and injected into the incoming phase reference current as the inductance is low and current dynamics are fast. This way, the torque ripple is reduced for a wide speed range. Compared to the conventional linear, sinusoidal, exponential, and cubic TSFs, better torque ripple performance is obtained.& COPY; 2023 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/
Citation - WoS: 1
Citation - Scopus: 2
Investigating the Role of Stator Slot Indents in Minimizing Flooded Motor Fluid Damping Loss
(MDPI, 2023) Tekgun, Didem; Tekgun, Burak; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
This 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.
Citation - WoS: 1
Citation - Scopus: 1
Investigating 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, Irfan; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
Conventional 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.
Citation - WoS: 5
Citation - Scopus: 5
Investigation of the Effects of Multi-Layer Winding Structures in Two Pole Synchronous Reluctance Machines
(IEEE, 2021) Tekgun, Didem; Cosdu, Muhammed Muhsin; Tekgun, Burak; Alan, Irfan; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
In 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.
LLC Laser Driver for Laser Wireless Power Transfer Application
(IEEE, 2024) Yigit, Hayri; Boynuegri, A. Rifat; Tekgun, Burak; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
Laser 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.
Citation - WoS: 1
Citation - Scopus: 2
A Modular Three-Phase Buck-Boost Motor Drive Topology
(IEEE, 2020) Tekgun, Didem; Tekgun, Burak; Alan, Irfan; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
The voltage-source inverter (VSI) is a fundamental power electronic device to drive three-phase electrical machines with high performance. In this paper, a modular three-phase DC/Rectified AC/AC (DC/RAC/AC) inverter supplying a permanent-magnet synchronous machine (PMSM) is proposed. In this topology, the three-phase VSI is composed of three single-phase modules connected in parallel. Each single-phase inverter module consists of a non-inverting bidirectional buck-boost DC/DC converter and a cascaded H-bridge inverter. Here, the DC/DC converter generates rectified AC waveforms and the H-bridge inverter alternates these signals to create the intended AC voltage waveform. Therefore, the bulk DC Bus capacitor and boost converter inductor, which exist in a typical battery-powered voltage boosting topology can be eliminated which results in a smaller size and reduced cost. In addition, the switching losses only occur in the DC/DC converter unit and the H-bridge inverter switching losses are negligible due to the zero-voltage switching while in a conventional structure, high-frequency switching occurs both in the DC/DC converter and the six-switch inverter causing reduced overall system efficiency. The proposed inverter is controlled with a well-known field-oriented control (FOC). This paper presents the operating principle, design, and control structure of the proposed three-phase inverter. The functionality of the three-phase inverter is verified through PowerSim simulations. The proposed motor drive system is compared to the conventional one while driving a 4 kW PMSM with FOC and the whole system efficiency difference map is generated. The biggest difference is recorded as 3.8 points favoring the proposed system.
Citation - WoS: 5
Citation - Scopus: 6
A Multi-Functional Quasi-Single Stage Bi-Directional Charger Topology for Electric Vehicles
(Elsevier, 2024) Tekgun, Burak; Tekgun, Didem; Alan, Irfan; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
In this paper, a multi-functional quasi-single stage, bi-directional electric vehicle charger topology is proposed to realize high efficiency power conversion in all AC/DC, DC/DC, and DC/AC forms. The proposed circuitry includes a noninverting buck boost converter (NBB) and an H-bridge inverter. The NBB converter generates the desired output voltage waveform in the rectified form then the inverter unfolds the waveform to the AC waveform. The advantages of this circuit are the reduced losses due to the high frequency switching only occurring at the NBB converter and passive element sizes are smaller leading to reduced losses and cost. The proposed charger is designed for 2 kVA rating and simulated for all vehicle, grid, and another vehicle interaction modes. Then the circuit is experimentally tested and is validated that the proposed circuit can operate in all three modes at a wide range of loading and power factor conditions with over 92% efficiency.
Citation - WoS: 35
Citation - Scopus: 49
Real-Time Energy Management in an Off-Grid Smart Home: Flexible Demand Side Control With Electric Vehicle and Green Hydrogen Production
(Pergamon-Elsevier Science Ltd, 2023) Boynuegri, Ali Rifat; Tekgun, Burak; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 02.05. Elektrik & Elektronik Mühendisliği
A real-time energy management system for an off-grid smart home is presented in this paper. The primary energy sources for the system are wind turbine and photovoltaics, with a fuel cell serving as a supporting energy source. Surplus power is used to generate hydrogen through an electrolyzer. Data on renewable energy and load demand is gathered from a real smart home located in the Yildiz Technical University Smart Home Laboratory. The aim of the study is to reduce hydrogen consumption and effectively utilize surplus renewable energy by managing controllable loads with fuzzy logic controller, all while maintaining the user's comfort level. Load shifting and tuning are used to increase the demand supplied by renewable energy sources by 10.8% and 13.65% from wind turbines and photovoltaics, respectively. As a result, annual hydrogen consumption is reduced by 7.03%, and the average annual efficiency of the fuel cell increases by 4.6% & COPY; 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.