Browsing by Author "Demirtas, Metin"

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Performance Comparison of the Sun Tracking System and Fixed System in the Application of Heating and Lighting
(King Fahd Univ Petroleum Minerals, 2010) Rustemli, Sabir; Dincadam, Ferit; Demirtas, Metin
In this work, a sun tracking system application is used for water heating and street lighting in Van. The solar photovoltaic system is designed for a house whose power is 5 kilo-Watts. An experimental setup is carried out for 183 Watts. An optimal variant is chosen with respect to stiffness and lightness conditions. A sun tracking device was used for rotating the solar still with the movement of the sun. A comparison between fixed and sun tracked solar stills showed that the use of sun tracking increased productivity by around 29%. It can be concluded that the sun tracking system is more effective than the fixed system and is capable of enhancing productivity.
Ripple Reduction at Speed and Torque of Step Motors Used on a Two-Axis Robot Arm
(Pergamon-elsevier Science Ltd, 2010) Rustemli, Sabir; Yilmaz, Murat; Demirtas, Metin
This paper presents the control of two axis robot arm. The system is consisted of two step motors, robot arm, computer and PIC16F84A. One of them controls the robot arm via parallel port of the computer. The other one controls end element on the arm by PIC16F84A. PIC16F84A drives the motor by the designed circuit drive. Although the control of the step motor is very easy, they work choppily. Therefore, it is necessary to reduce the ripples occurred at the speed and torque of the step motor. In this study, proportional-integral-derivative (PID) controller is used to reduce the ripples. The obtained results show the proposed method is very successful. (C) 2010 Elsevier Ltd. All rights reserved.