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    An adaptive PI controller schema based on fuzzy logic controller for speed control of permanent magnet synchronous motors
    (2013) Çelik, E.; Dalcali, A.; Öztürk, N.; Canbaz, R.
    In speed control systems, which is desirable is that the speed of a controlled object should track the reference speed as fast as possible and at the same time should provide good robustness to load variations. As far as conventional PI controllers are concerned, once their parameters are tuned for solely one operating condition, they remain constant during the whole operational cycle and therefore, a poor controller performance may arise unexpectedly when the operating condition is changed. To overcome this problem, a PI controller incorporated by fuzzy logic controller (FLC) is introduced in this paper for the speed control of a permanent magnet synchronous motor (PMSM). In the proposed control schema, the parameters of the PI controller are determined online based on the error signal and its time derivative by means of a PD-type FLC, which has separate two rule bases, the former of which is responsible for P gain and the latter is for I gain. According to the computer simulations performed under the same conditions, the obtained results based on the proposed method are more promising than those obtained by the conventional PI controller with fixed parameters. © 2013 IEEE.
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    An induction motor design for urban use electric vehicle
    (Institute of Electrical and Electronics Engineers Inc., 2016) Guneser, M.T.; Dalcali, A.; Ozturk, T.; Ocak, C.; Cernat, M.
    Because 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. © 2016 IEEE.
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    Optimum pole arc offset in permanent magnet synchronous generators for obtaining lowest voltage harmonics
    (Elsevier Science Bv, 2017) Dalcali, A.; Akbaba, M.
    In this study, the effect of parametric variation of pole arc offset distance on the performance of a Permanent-Magnet Synchronous Generator (PMSG) used in wind energy applications has been investigated. Fourier analyses of the voltage wave-shapes that are obtained by the parametric variation of the pole arc offset value have been made. The THD is determined for each voltage wave-shape. As a result of optimization study, the efficiency and output power have been kept approximately constant. The THD of the output voltage has decreased. (c) 2017 Sharif University of Technology. All rights reserved.
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    Optimum rotor design of small PM BLDC motor based on high efficiency criteria
    (Asian Research Publishing Network, 2015) Saygin, A.; Ocak, C.; Dalcali, A.; Çelik, E.
    In the systems that are fed by batteries, the duration of the energy supplied to the system is of great importance. To use high efficiency-motors in these systems can extend the battery usage time and it can be said that obtaining high efficiency-motors used in low power applications is rather difficult. In this regard, in this paper, design and optimization of a brushless permanent magnet DC motor have been carried out successfully, especially for a system fed by battery. By considering the high efficiency criteria, rotor design parameters such as rotor geometry, thickness and placements of the magnets, and embrace factor have been carefully examined. By obtaining the optimal rotor geometry providing maximum motor efficiency, some informative theoretical and finite element analyses are carried out. Electrical and electromagnetic distributions gained by the changes in rotor design parameters are presented in graphics. As a result of successive steps in the paper, the efficiency is increased; the cogging torque and magnet consumption are reduced for the motor under consideration, which is 20W, 24V, 3000 rpm with an inner-type rotor. © 2006-2015 Asian Research Publishing Network (ARPN).