Yazar "Demirsoy, Berk" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Analysis of the Effect of Switching Frequency on Acoustic Noise in External Rotor Brushless DC Motors
    (2024) Er, Buğra; Demirsoy, Berk; Fenercioğlu, Ahmet
    Electric motors are actively used in various industries. Acoustic noise is crucial in electric motors, and specific standards are depending on their application areas. Despite better performance, including acoustic noise, than brushed motors, brushless motors still generate acoustic noise due to their mechanical, electrical, and electronic components. This study investigated the impact of varying the switching frequency through the driver on the acoustic noise of an external rotor brushless DC motor. Tests were conducted on a surface-mounted magnet brushless motor with different switching frequencies, and detailed information about the sections of the control board governing the brushless motor was provided. The study includes measurements of motor speed, current, switching frequency, phase signal, and acoustic noise measured at two different locations in decibels. It was observed that the acoustic noise increased at specific switching frequencies. Furthermore, the variation in switching frequency also affected the heating due to losses in the switching elements. Increasing the switching frequency in the 12-28 kHz range reduced motor speed and the measured acoustic noise, while temperature increases were observed in various frequency ranges.
  • Küçük Resim Yok
    Öğe
    Effects of Brush Shift on Performance and Experimental Verification of Direct Current Motors
    (Institute of Electrical and Electronics Engineers Inc., 2024) Demirsoy, Berk; Almaci, Gurkan; Fenercioglu, Ahmet
    In this paper, the effect of brush shifting method is examined to improve the performance of brushed DC motors used in automatic door systems. The brush angles were tested to reduce commutation problems caused by armature reaction and to enhance motor efficiency. In the experiments, the motor was operated under nominal load, and current waveforms obtained by shifting the brushes clockwise (CW) and counterclockwise (CCW) at 4° and 8° angles were analyzed. The results show that shifting the brushes 4° in the counterclockwise direction minimizes current ripple and significantly reduces arcing during commutation. This method offers an effective solution to increase motor efficiency and reduce energy losses. © 2024 IEEE.