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.
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Profesor Doktor
Email Address
bulent.ertan@atilim.edu.tr
ORCID ID
0000 0003 4128 8867
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Turkish CoHE Profile ID
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Now showing 1 - 10 of 25
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    Conference Object
    Citation Count: 3
    Standstill Estimation of Stator Resistance of Induction Motors with Novel Innovation-Based Adaptive Extended Kalman Filter
    (Institute of Electrical and Electronics Engineers Inc., 2021) Ertan, Hulusi Bülent; Yirtar,M.Z.; Bulent Ertan,H.; Electrical-Electronics Engineering
    In this study, a method is developed to identify stator resistance of an induction motor (IM) at standstill in the self-tuning. An innovation-based adaptive extended Kalman filter (IAEKF) estimator in which the process noise is dynamically updated with an adaptive mechanism different from the conventional extended Kalman filter (EKF) is designed to estimate stator resistance with αβ- stator stationary axis components of stator current and αβ- components of stator flux of an IM. The reason for estimating the stator flux and stator current together with the stator resistance is to both increase the stability of the proposed estimator algorithm by using the correlation between the parameters and states in the non-linear inputs applied to the estimator and obtain the motor flux information needed by the control system. In the proposed IAEKF algorithm, a stator flux-based IM model is used for prediction purposes. The standstill estimation performance of the proposed novel IAEKF is tested with both sinusoidal and PWM power supplies, The real-time estimation results show the effectiveness and prediction accuracy of the proposed stochastic-based estimator. © 2021 IEEE.
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    Article
    Citation Count: 2
    Inductance Measurement Methods for Surface-Mount Permanent Magnet Machines
    (Ieee-inst Electrical Electronics Engineers inc, 2023) Ertan, Hulusi Bülent; Sahin, Ilker; Electrical-Electronics Engineering
    Analytical performance estimation of a permanent magnet (PM) motor requires an accurate equivalent circuit model. In a lumped electrical model of a PM motor, resistance and inductances appear as passive elements, which are used to represent the phase winding resistance, inductance, core loss, etc. There is currently no available standard for parameter measurement of PM motors. In the literature, there are many studies on inductance measurement. However, they are applied to different types of motors. The purpose of this study is to evaluate those different inductance measurement methods, on the same motors, to identify whether they lead to the same result. Also, it was aimed to find out the difficulties involved in the measurement process. This study concentrates on determining the d -axis and q -axis inductances of two different surface-mount PM motors at standstill and under running conditions. The standstill measurement methods evaluated include the "current decay " method and the "dc inductance bridge " method as well as more common methods. The dependence of the inductances on the current magnitude, frequency, and excitation signal waveform is investigated. Measurements with PWM and sinusoidal ac voltage excitation are found to give similar results. The tests indicated that the "current decay " method is prone to measurement errors especially when the phase resistance is low. It is discovered that inductance measurements from standstill tests are independent of frequency for all practical purposes. Next, the same inductances are measured, while the test motors are running. The methods considered include; inductance measurement from no-load test, zero power factor (PF) load test, and unity PF load test; while the machine is in generating mode. Furthermore, a new inductance measurement method is introduced where the measurement is made while the test motor is driven with a vector-controlled drive. Finally, inductance measurement results from different standstill tests and running tests are compared and evaluated.
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    Conference Object
    Citation Count: 4
    Magnetically geared direct drive wind generator thermal analysis
    (Institute of Electrical and Electronics Engineers Inc., 2017) Ertan, Hulusi Bülent; Ertan,H.B.; Yamali,C.; Tarvirdilu-Asl,R.; Electrical-Electronics Engineering
    This 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.
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    Article
    Citation Count: 0
    An Approach for Performance Prediction of Saturated Brushed Permanent Magnet\rdirect Current (dc) Motor From Physical Dimensions
    (Tubitak Scientific & Technological Research Council Turkey, 2022) Ertan, Hulusi Bülent; Asl, Rasul Tarvirdilu; Zeinali, Reza; Ertan, Hulusi Bulent; Electrical-Electronics Engineering
    An 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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    Conference Object
    Citation Count: 0
    Sizing of Series Hybrid Electric Vehicle With Hybrid Energy Storage System
    (Ieee, 2018) Ertan, H. Bulent; Ertan, Hulusi Bülent; Arikan, F. Remzican; Electrical-Electronics Engineering
    This 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.
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    Conference Object
    Citation Count: 0
    Rotor Resistance Estimation of Induction Motors With a Novel Innovation-Based Adaptive Extended Kalman Filter for Self-Tuning
    (Transilvania University of Brasov 1, 2023) Inan,R.; Ertan, Hulusi Bülent; Bulent Ertan,H.; Electrical-Electronics Engineering
    In this study a novel estimator is developed to identify the rotor resistance of the induction motor (IM) at standstill for self-tuning. For this purpose, an innovation-based adaptive extended Kalman (IAEKF) filter estimator is designed. IAEKF provides a more dynamic estimation compared to the conventional extended Kalman filter (EKF), as they have a mechanism where the system noise covariance matrix can be updated continuously, unlike conventional EKF. To increase estimation stability and also for position and amplitude information of the motor flux required for the dynamic control methods, stator stationary axis (-αβ) components of stator current and -αβ components of stator flux are estimated with rotor resistance by using the correlation between states and parameters defined as nonlinear inputs. The estimation performance of the proposed IAEKF algorithm is tested both in the simulation and on the real-time IM experimental setup at standstill. Simulation and real-time results show that the estimation achievement of the proposed IAEKF algorithm is quite impressive. © 2023 IEEE.
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    Conference Object
    Citation Count: 0
    An Approach for Improving Performance of Sensorless Field Control
    (Institute of Electrical and Electronics Engineers Inc., 2018) Bulent Ertan,H.; Ertan, Hulusi Bülent; Filci,T.; Electrical-Electronics Engineering
    Sensorless 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. © 2018 IEEE.
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    Doctoral Thesis
    El Rehabilitasyonu için Geliştirilen Harici İskeletin Optimal Tasarımı
    (2019) Mohammadzadeh, Mohammad Hassan Gol; Ertan, Hulusi Bülent; Mohammadzadeh, Mohammad Hassan Gol; Ertan, Hulusi Bülent; Arıkan, Kutluk Bilge; Electrical-Electronics Engineering; Department of Mechatronics Engineering
    Bu tez çalışması, robotik el rehabilitasyon sistemi tasarım ve uygulamasını hedefleyen bir proje kapsamında gerçekleştirilmiştir. Beyin damarlarını etkileyen kazaların yol açtığı sakatlıklar hemiplejik olduğundan, projede işlev kaybı olan elin dış iskelet tarafından yönlendirildiği bir sistem üzerine yoğunlaşılmıştır. Bu çalışmada robotik harici iskelet, görsel uyaran yazılımı ve ayna nöron sistemi aktivitesini gözlemleyen ölçüm sistemi ile senkronize bir biçimde çalışmaktadır. Bu tez kapsamında harici iskelet mekanizmasının, ileri ve tersine aktarım açıları ve hedeflenen kinematiği kullanan bir çoklu amaç fonksiyonu ile eniyilenmesi hedeflenmiştir. Çoklu gövde dinamiği modelleri ve sanki-statik yapıdaki kinetik modeller, tasarım ve benzetim amaçlı geliştirilmiş ve kullanılmıştır. Projemizde insan parmağının eklemlerindeki pasif torklar tam ve kesirli mertebe diferansiyel denklemlerle modellenmiştir. Parmağın dış iskelet ile bütünleşik benzetimlerinde tam ve kesirli mertebeden pasif torklar uygulanmıştır. Kesirli mertebe torklar, parmakta spastisite sonucu oluşan anomalinin modellenmesi için önerilmiştir. İnce kavrama hareketini sağlamak amacıyla PID ve FEL tipi denetimciler tasarlanmış ve model üzerinde sınanmıştır. Uyarlamalı bir kontrolcü olan FEL'in, kesirli mertebe pasif torklar etkin olduğunda PID'den daha başarılı sonuçlar verdiği gözlenmiştir. Direkt ve tersine sanki-statik modellerin, pasif torkların kestirimine yönelik kullanımı da tez kapsamında sunulmuştur.
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    Conference Object
    Citation Count: 1
    Fem-Based Design Modifications and Efficiency Improvements of a Brushed Permanent Magnet Dc Motor
    (Ieee, 2017) Tarvirdilu-Asl, Rasul; Ertan, Hulusi Bülent; Zeinali, Reza; Ertan, H. Bulent; Electrical-Electronics Engineering
    This 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.
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    Conference Object
    Citation Count: 2
    Designing High Power Density Induction Motors for Electric Propulsion
    (Ieee, 2022) Ertan, H. Bulent; Ertan, Hulusi Bülent; Siddique, M. Salik; Koushan, Salar; Azuaje-Berbeci, Bernardo J.; Electrical-Electronics Engineering
    Designing high-power-density electric motors for propulsion has become an increasingly important issue in the past few decades. This is not only because electric vehicles are projected to become the main private transportation means in near future, but also because of the ever so important metro and railway transport requirements. Along with these application areas, electric aircraft propulsion is also coming into focus in recent years. Electric motors for traction are required to have high torque density, high efficiency over a wide speed range and are required to be robust. In recent years, permanent magnet (PM) motors became the favorite choice for such applications because of their higher efficiency than other types of motors. Increasing demand for permanent magnets is likely to cause supply problems. Therefore, permanent magnet-free alternative motor types are of much interest. In this paper, the authors present the design of a 125 kW induction motor for railway application. This design has 3-times the power density of a commercial induction motor. The designed motor is manufactured and its test results are used for establishing an accurate finite-element model for the prediction of its performance. This model is used to investigate the effect of magnetic loading choice, slot shape and magnetic material choice on the efficiency of the motor. It is shown that with the same basic dimensions the efficiency of the motor can be increased to 96% which is comparable with a similar size PM motor.