Elektrik Elektronik Mühendisliği Bölümü

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Citation - Scopus: 4
Comparing Control Performances of Mrac and Pid Applied on a Brushless Dc Motor
(International Organization on 'Technical and Physical Problems of Engineering', 2020) Ciba, S.; İskender, İres; Iskender, I.; Ariani, H.A.; Elektrik-Elektronik Mühendisliği
Brushless DC motors are powered by a DC electric source and are used widely used in appliance, automotive, aerospace, medical and industrial equipment due to their compact size and light weight. Parallel to improvements in semiconductor industries the operating frequency of semiconductor switches and microcontrollers are getting improve and this provides conditions to use different algorithms in motor control. In this study the reference model adaptive control of a DC brushless motor will be studied. Brushless DC motors have some advantages such as long working life, high efficiency, and low maintenance requirements; however their control is a bit complicated. For this reason, there have been published many studies in relative with speed control of brushless DC motors. Classical or modern control methods can be used for this purpose. In this study, BLDC motor is controlled with firstly classical PID controller and secondly model reference adaptive control (MRAC) based on MIT law method and the results are compared. © 2020, International Organization on 'Technical and Physical Problems of Engineering'. All rights reserved.
Citation - Scopus: 9
Design and Performance Analysis of a Three Winding Transformer Used in Solar System
(International Organization on 'Technical and Physical Problems of Engineering', 2021) Jahi, A.; İskender, İres; Iskender, I.; Elektrik-Elektronik Mühendisliği
Due to the increasing of the fossil fuels prices in the past years and lack of these sources, all scientists encouraged to looking for the alternative energy sources. One of these energy sources is the renewable solar resources. Power transfer from solar systems to grid is achieved using step up transformers. This type of transformer is energized from a converter/inverter with or without variable frequency. The losses of such transformer are higher than those used in sinusoidal voltage power systems. This is due to harmonics content in the transformer input voltage and current. In this study the design and production of a PV transformer have been done according to the IEEE C57.159 guide and the loss analyses of transformer have been done using ANSYS MAXWELL considering the procedures proposed in standards of IEC 61378-1, IEEE C57.110 and the method proposed by Dowell. Finally, the thermal modeling and behavior of the transformer was investigated using the thermal model given in [25] to determine the hot spot and life time of the transformer using MATLAB program. © 2021, International Organization on 'Technical and Physical Problems of Engineering'. All rights reserved.
Citation - Scopus: 6
Design of Frameless Gimbal Motor for Uav Applications
(International Organization on 'Technical and Physical Problems of Engineering', 2022) Arslan, S.; İskender, İres; Iskender, I.; Arslan, Serdar; Elektrik-Elektronik Mühendisliği; Bilgisayar Mühendisliği
Recently, application areas of the Unmanned Aerial Vehicle (UAV) systems have started to expand very rapidly due to the fact that offering more effective, economical, reliable and safe solutions compared to manned air platforms, satellites and/or various ground platforms. However, desire to develop higher performance, resourceful, lighter, small and low powered payload make the gimbal platforms mandatory part of the UAVs in a short time and their role is getting increased day by day. In parallel with the increasing demand for precise stabilization, robustness, lightness and agility in gimbal systems, it has become an important trend to use more-electric (ME) customed systems instead of traditional market products. The electric motors that control the speed and position of the gimbal system are simply referred to as gimbal motors. Related design study focuses on designing direct-drive in-runner frameless gimbal motor with the following features; 8.5 VAC line voltages, 24-slot/28-pole combination, 60 rpm, 80 mN.m. Permanent magnet synchronous motor topology is determined to offer higher torque density, higher precision and fast response required for gimbal platforms. The selecting criteria of dimensions, performance parameters, materials, machine type with rotor structures and motor duty cycle are also explained. The gimbal motor is performed analytically in Ansys RMxprt with parametric assignments, statistically and sensitively tuned in Maxwell 2D and optimized in Maxwell 3D by finite element method (FEM) optimetric convergence approach with magnetostatic and transient solutions to get the final machine shape. This study is currently part of the gimbal system to be produced for medium sized surveillance UAV. Since the gimbal motor has been prototyped, all dimensions given are valid. © 2022, International Organization on 'Technical and Physical Problems of Engineering'. All rights reserved.
Citation - Scopus: 1
High Voltage Dc Systems and the Related Commisioning
(International Organization on 'Technical and Physical Problems of Engineering', 2020) Haliloglu, A.B.; İskender, İres; Iskender, I.; Elektrik-Elektronik Mühendisliği
The number of High Voltage Direct Current (HVDC) projects worldwide has increased considerably due to the growing interest in this mature technology. Rapid development in semiconductor technology have led to the development of converter technology and thus new application areas have emerged. In this study, historical development of HVDC systems, differences among them considering installation types and application areas are explained. Circuit models of HVDC systems, working principle and general usage purposes are also explained. The differences between conventional Current Source Converters (CSC) and Voltage Source Converters (VSC), which are expressed as relatively new technology, are discussed. Also, within the scope of a project, a HVDC prototype system developed by local engineers from mechanical design to control and protection software has been described. In addition, the tests to be performed before commissioning of HVDC and similar systems are explained. Descriptions of the tests, methods to perform the tests and some issues that should be considered while performing the tests are given. © 2020, International Organization on 'Technical and Physical Problems of Engineering'. All rights reserved.
Citation - Scopus: 11
Performance Analysis of a Distribution Transformer Using Ansys Maxwell
(International Organization on 'Technical and Physical Problems of Engineering', 2020) Ariani, H.A.; İskender, İres; Iskender, I.; Karakaya, M.; Elektrik-Elektronik Mühendisliği
The purpose of this study is to verify the theoretical calculations of a three-phase transformer by analyzing its magnetic field behaviors and losses under no-load and full-load working conditions using an advanced simulation program that runs based on finite elements method (FEM). This paper presents detailed explanations on defining the parameters and obtaining the results, and also the calculation method for determining the magnitude of the magnetic field and the core and ohmic losses of the transformer. The reliability of the analysis is confirmed by theoretical calculation results. © 2020, International Organization on 'Technical and Physical Problems of Engineering'. All rights reserved.
Citation - Scopus: 2
Pi Control of a Novel Power Converter by Using Heuristic Optimization
(International Organization on 'Technical and Physical Problems of Engineering', 2021) Tulay, G.; İskender, İres; Karakaya, M.; Iskender, I.; Elektrik-Elektronik Mühendisliği
In this study, obtaining the PI control coefficients of a power converter using the heuristic optimization method was investigated. A new converter has been designed to increase the lifetime of the energy storage unit of a satellite power subsystem. It is also possible to increase the active duty life of the satellite by using the aforementioned converter according to the increased battery life. © 2021, International Organization on 'Technical and Physical Problems of Engineering'. All rights reserved.
Citation - Scopus: 9
Sensorless Speed Control of a Bldc Motor Using Improved Sliding Mode Observer Technique
(International Organization on 'Technical and Physical Problems of Engineering', 2019) Topal, M.; İskender, İres; Iskender, I.; Genc, N.; Elektrik-Elektronik Mühendisliği
This paper proposes controlling the velocity of BLDC motor using sliding mode observer technique based on the estimation of back electromotive force (back EMF). There are many different sensorless control methods for BLDC motor, but in this paper one of them is examined in detail, comparing with the zero crossing points detection of back EMF and hall sensor control. The proposed method estimates the velocity and rotor position by measuring terminal voltages and currents. According to the rotor position, two inverter switches are energized to commutate the phases of BLDC motor. As comparing desired and real line currents, the commutation signals are acquired with hysteresis band. The simulation model of the suggested method is performed by using MATLAB Simulink environment and results have been simulated to interrogate the performance of the BLDC motor under a load change condition also with reference speed. © 2019, International Organization on 'Technical and Physical Problems of Engineering'. All rights reserved.
Citation - Scopus: 5
Three-Phase Buck Type Pfc Rectifier for Electrical Vehicle Battery Charger
(International Organization on 'Technical and Physical Problems of Engineering', 2019) Demirkutlu, E.; İskender, İres; Iskender, I.; Elektrik-Elektronik Mühendisliği
Three-phase AC/DC buck-type power factor correction (PFC) rectifier is presented in this paper. State of the art three-phase AC/DC rectifiers and improvements of the rectifier topologies are researched in this study. The SWISS Rectifier is implemented for Electrical Vehicle (EV) battery charger with 220 VLN-rmsS / 50 Hz three-phase input. The SWISS Rectifier for EV charger application is implemented by means of simulations. Depending upon the battery pack needs, 48 VDC output voltage is examined under both steady-state and dynamic load change conditions. © 2019, International Organization on 'Technical and Physical Problems of Engineering'. All rights reserved.

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