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Öğe Advancing Pole Arc Offset Points in Designing an Optimal PM Generator(Assoc Information Communication Technology Education & Science, 2016) Ocak, Cemil; Tarimer, Ilhan; Dalcali, AdemIn this study, the offset points which locate at the pole arc of the designed 1 kW direct-drive permanent magnet synchronous generator (PMSG) have been changed based on parametric approach, and a performance rise for the designed generator has been observed by changing offset parameters. In order to obtain efficient physical sizes and electrical values of the designed generator, the pole arc offset points have been taken forward gradually by using finite element methods. The effects of different offset points on the generators performance have been simulated and interpreted graphically. It has been shown that changing pole arc offset sizes has decreased harmonics distortion and magnet weight in designing 1 kW PM generator. As a result, the 1 kW PM generator has been obtained with high efficiency, less harmonic distortions at sinusoidal wave and less PM weight at whole generator weight.Öğe Cogging torque reduction by optimal design of PM synchronous generator for wind turbines(Pergamon-Elsevier Science Ltd, 2017) Ozturk, Nihat; Dalcali, Adem; Celik, Emre; Sakar, SelcukIn this study, design and optimization of a surface-mounted permanent magnet synchronous generator (PMSG) have been carried out for use in low power wind turbines. In the successive optimization steps based upon the parametric solution method, design parameters of skew, pole embrace, and pole arc offset are chosen to be optimized so that the cogging torque is reduced. Cogging torque is a type of torque ripple coming from the machine design and causes undesired vibration and acoustic noise during the operation of machine. Moreover, although the effect of cogging torque in high power surface-mounted PMSGs is not sensible, it becomes important in low power applications to maintain good dynamical behavior. Analytical and finite element analysis (FEA) are conducted after obtaining the magnet structure that provides minimum cogging torque. Electrical and electromagnetic distributions are presented according to the changes in the corresponding design parameters. While the cogging torque in the initial design is 522.7 mNm, it has been reduced to 49.1 mNm in the optimized generator, which in turn means an improvement of about 90%. The generator under consideration has the specifications of 2.5 kW, 120 V, 14-pole with an inner type-rotor. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Öğe Comparison of 2D and 3D magnetic field analysis of single-phase shaded pole induction motors(Elsevier - Division Reed Elsevier India Pvt Ltd, 2016) Dalcali, Adem; Akbaba, MehmetThere has always been doubt on the accuracy of 2D analysis of small electric machines. To investigate the validity of this doubt, in this present work a small uni-coil shaded-pole induction motor is analyzed in 2D and 3D and the results are compared. In order to maintain the paper size as compact, the analysis is limited to the air-gap flux density distribution, variation of the main winding inductance against current and the force acting on the rotor body; which are the important components of the motor performance. It is found that although 3D analysis consumes several times more computing time and storage space, improvement achieved in performance by use of 3D analysis is not very significant. % rms difference between the two cases is obtained as 0.76% for the main winding inductance and 0.59% for the force acting on the rotor body. Also the air-gap flux density distribution obtained from the two types of analysis is found to be very close to each other. Therefore it is concluded that despite more computing time, more storage requirements and more human effort in the case of 3D analysis, the degree of improvement is not proportionally rewarding, and hence, 2D analysis is sufficient for the analysis of small machines. (C) 2015, Karabuk University. Production and hosting by Elsevier B.V.Öğe Comparison of the performance of bridge and bridgeless shaded pole induction motors using FEM(Ios Press, 2017) Dalcali, Adem; Akbaba, MehmetTwo 15W shaded pole motors with bridged and without bridge type stators were modeled using 2D and 3D analysis were performed using finite element analyzes. The magnetic behavior of the motor was determined by obtaining the magnetic flux density over the cross section of the motor and the air gap flux waveforms. Recently, a new modified structure of these motors has started to be seen in the literature, and this structure is called the bridged structure. The flux value transferred to the rotor in bridgeless motors is greater than with the bridged stator type. The harmonic components were obtained by making the Finite Fourier analyses of the waveforms of flux densities. It was determined that the bridged structure had the disadvantage of having stronger harmonics than the bridgeless structure. The magnetic performances of 4 different rotor structures were examined in the rotor part of the bridgeless- type motor. The number of rotor slots were modified between 16 and 32 by selecting Type 1 on these different rotors. The optimum number of rotor slots was determined to be 26. It was stated that determining the optimum number of slots in the design of these motors would provide significant improvement in the performance.Öğe Design of a two-pole electromagnet and its analysis under different load conditions(2024) Çevlikli, Sena; Öncü, Selim; Dalcali, AdemElectromagnets can be used in devices, such as motors, generators, and transformers, and in tasks, such as lifting and transporting object. This study aimed to lift and transport iron blocks in iron and steel factories and rolling mills. The design and analysis of a two-pole electromagnet with a carrying capacity of up to 1.5 tons were performed. It was aimed to design an electromagnet in such a way that it would provide transport with minimum copper loss without reaching the saturation at an appropriate ampere-turn value according to the type and size of the load to be carried. By performing analytical calculations, a suitable model for the requirement was designed and Finite Element Analysis (FEA) was conducted. In the analysis, magnetic flux density, winding current ratios, and force values were examined. Analyses were investigated for different load quantities and numbers.Öğe Detection of the space harmonics of the shaded pole induction motor(Academic Publication Council, 2017) Dalcali, Adem; Akbaba, MehmetIn many cases, shaded pole induction motors have variable air gaps, and because of this, their air-gap flux density waveforms are too far from a sinusoidal distribution. Utilizing of variable air-gap in shaded pole motors contributes to the starting torque by inducing reluctance torque component. However, variable air-gap introduces additional harmonic components in the airgap flux density waveforms. In this study, detection of the space harmonics of the shaded pole induction motor has been realized. To be able to detect the space harmonics, the rotor of the motor has been produced in a way that aluminum has not been cast, and the short circuit rings of the rotor has have not been inserted. A search-coil whose number of turns is known has been wound to the rotor, rated voltage has been applied to the stator, and the position of the rotor has been varied with a step electrical angle of 3.6o with the help of a step motor. The mutual inductance between the stator and rotor has been determined by reading the voltage induced across the search-coil. The attained mutual inductance waveform has been subjected to Discrete Fourier analysis. From the analyses, it has been observed that especially the 3rd, 5th, and 7th harmonics, especially, are very significant. Other harmonics up to 13th are above 1% of the fundamental component, and the 15th and subsequent harmonics decreases below 0.8% of the fundamental component of the air-gap flux density waveform. Therefore, for a reasonably accurate performance, an analysis of this these machines, at least 3rd, 5th, and 7th harmonics, should be considered.Öğe External Rotor 6/8 Switched Reluctance Motor Design for E-Bike(Ieee, 2021) Koyuncu, Samet; Tuncer, Ugur; Dalcali, Adem; Oncu, SelimThe interest in electric bicycles, which are personal transportation vehicles, is increasing due to the reasons such as being affordable, environmentally friendly and healthy. This article presents the design of an external rotor Switched Reluctance Motor (SRM) suitable for in-wheel use, with a 3-phase 6 stator pole number and 8 rotor pole number designed using the Finite Element Method (FEM). In the study, performance parameters such as output torque, magnetic flux density distribution, copper loss and core loss are presented The obtained results show that the proposed SRM structure is suitable for E-bike applications.Öğe An Induction Motor Design for Urban Use Electric Vehicle(Ieee, 2016) Guneser, Muhammet Tahir; Dalcali, Adem; Ozturk, Turgut; Ocak, Cemil; Cernat, MihaiBecause of fossil fuel shortage and its damages on environment, electric vehicles (EV) are going to be more popular in science and car industry as well. So, EV's take an opportunity to spread over the traffic finally. But battery, which is the main energy supplier of the motor, has disadvantages as big volume and weight. Scientists try to enhance energy densities, ranges and quicken charging. All of research results force us to drive EV in a loop, close to charging stations for near future. So EV's should be designed by considering urban road and speed conditions as well. In this survey, we designed a new two pole 7,5 kW induction motor for a certain electric vehicle, which was designed to use urban drive. We considered urban traffic rules and conditions, while designing the motor. We simulated and verified analytical and finite element analysis of the designed induction motor. We also modelled and simulated the EV with the induction motor on MATLAB to observe control performance of field oriented control (FOC) on several urban use scenarios. According to our results, EV with designed motor can be realized and controlled.Öğe Influence of Rotor Slot Structure at Starting Torque and Efficiency on Urban Use EV Motor(Ieee, 2019) Guneser, Hammet Tahir; Dalcali, Adem; Ozturk, Turgut; Ocak, CemilIntensive studies are conducted on electric vehicles (EV) in recent years as alternative to fossil fuels. But range and battery problems prevent to take-off EV on the market. By designing of urban use EV can be eliminated mentioned disadvantages. But Urban traffic style has some difficulties for electrical motors (EM) such as unsteady velocity changes and stop-go along the traffic. So, starting Torque of EM becomes importer beside of weight and efficiency for urban use EVs. In this study, we proposed an induction motor (IM) with squirrel cage by optimizing rotor slot structure for higher starting torque and efficiency. The physical parameters of the rotor were defined as variables by parametric approximation method. Totally, 19008 of analyzes were performed at each point within the specified limits. Changes of the efficiency, weight, nominal and starting torque were obtained to determine optimized induction motor.Öğe Investigation Effects of Narrowing Rotor Pole Embrace to Efficiency and Cogging Torque at PM BLDC Motor(Assoc Information Communication Technology Education & Science, 2016) Ocak, Cemil; Tarimer, Ilhan; Dalcali, Adem; Uygun, DurmusEngineers think that pole embrace size of a PM BLDC motor affects directly the efficiency and the torque. Dealing with the experimental research, in the study we have investigated the effects of narrowing rotor pole embrace step by step by changing sizes parametrically. By doing so, high efficiency and low cogging torque would have been obtained for a 20 W PM BLDC motor. In order to do this, pole arc to pole pitch ratio of magnets at the rotor poles has been changed parametrically (0.5 to 1) by genetic algorithm methodfirst. Then the electromagnetic field dispersions, output parameters of the motor, new rotor constructions have been obtained; and new pole embrace has been derived from the variation of pole arc to pole pitch ratio. We have also calculated the magnetic flux distribution, output power, torque, cogging torque and efficiency values analytically and the effects of new pole embrace to motor efficiency and torque have been simulated. The developed 18 slots, 6 poles, surface mounted inner runner configuration rotor machine is proposed as to be used in small dentistry apparatus.Öğe A New Electromagnetic Helical Coilgun Launcher Design Based on LabVIEW(Ieee-Inst Electrical Electronics Engineers Inc, 2016) Ege, Yavuz; Kabadayi, Murat; Kalender, Osman; Coramik, Mustafa; Citak, Hakan; Yuruklu, Emrah; Dalcali, AdemIn this paper, a new helical coil electromagnetic launcher is designed, which launches a magnet projectile without using any mechanical launching equipment, but by applying momentary varying current to the helical coil. For measuring the velocity of the magnet projectile in different stages, a LabVIEW-based software and hardware system is developed, and it is also used for improving the performance of the output velocity of the magnet projectile by changing the ignition time of the coils. This paper distinguished the new accelerator coil design and the software, which uses LabVIEW for the first time in this area. With the LabVIEW-based software, optical sensor data are acquired and processed, and ignition triggering control is carried out. Ignition timings on sequential four helical coils are optimized to produce the maximum acceleration in each coil, and thus the maximum velocity of the magnet projectile at output. An NI Data Acquisition 6010 data acquisition card is used for communication and gathering information throughout the entire launching process. In addition, the effects of changing the current magnitude, ignition time, magnet projectile length, and diameter to the output velocity of magnet projectile are investigated and discussed in detail.Öğe Performance Optimisation of Single-Phase Variable Reluctance Shaded-Pole Motor br(Univ North, 2022) Dalcali, Adem; Akbaba, MehmetShaded pole induction motors' theoretical analysis is quite difficult because of the presence of strong harmonic components and the elliptical rotating field. The change of air gap reluctance is affecting the air gap flux distribution and thus the performance of the motor. In the study, the effect of the change in the SPIM's stator, rotor and squirrel cage on the performance of the motor is analysed by the Finite Element Method. The flux distributions and torque values of the closed-interpoles type and the stator with different interpoles clearances are obtained. The effects of single and double cage structures in the rotor part and the effects of copper and aluminium cage materials in the squirrel cage were analysed. Accor ding to the analyses, it was determined that the single cage motor with aluminium cage material exhibited the best torque performance with a torque value of 1 32.78 mNm
