Yazar "Fenercioğlu, Ahmet" seçeneğine göre listele

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    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.
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    Design and Production of Belt Drive Elevator Traction Machine: Modelling of Double Side Belt System
    (2024) Soyaslan, Mucahit; Avşar, Yusuf; Fenercioğlu, Ahmet; Sarıhan, Feyyaz
    Elevator traction motors are critical components of elevator systems. After the structural analysis of the traction motor, it is necessary to proceed to the production processes for the comfortable and safe use of elevator systems. In this study, the static load values for bearing lifetime calculation, belt selection, and finite element analyses (FEA) were determined. According to calculated loads; materials, bearings, belt, pulley, brake, and encoder were selected. In order to obtain a design in accordance with elevator standards, motor parts were examined for structural analysis. Finite element analyses were carried out according to the determined maximum static load values, and a new belt elevator traction motor design that provides the safety coefficients has emerged. When the FEA analysis results of bending moments are examined; the maximum Von Mises stress acting on the motor frame and shaft was obtained 17.1 MPa and 27.62 MPa respectively. The maximum Von Mises stress was obtained under the torsional moment as 71.4 MPa and the shaft is 6.1 times safe against a torsional moment. This value is the minimum safety factor of the designed system and safety factors of bending moments are higher than this value. The designed elevator machine has got 12.9 kW rated power, 1.6 m/s cabin speed, and 1175 kg carrying capacity. The advantage of the proposed design is to eliminate the casting process with modular structure via double side belt system. The prototype of the designed motor was produced and it was observed that the motor provided the desired constraints as a result of the loading experiments.
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    Experimental verification of performance of single phase induction motor for different rotor slot shapes
    (2025) Kurt, Merve Şen; Fenercioğlu, Ahmet
    This study investigates the effect of rotor slot design and the improvement to performance and efficiency in the run capacitor single phase induction motor used in refrigerator compressor. The study considers the effect of deep and double cage rotor slot design on performance and compares this with the original motor design using finite element analysis. Rotors with deep and double cage slot structure were manufactured as prototypes and tested in the same stator. The reliability of the model was confirmed by the experimental measurements and finite element analysis solutions. The efficiency of the motor was increased by 4.1% with the double cage rotor and 1.95% with the deep slot structure with improvements in rotor slot geometry. The best performance from the double cage rotor induction motors was output power 125 W, torque 0.42 Nm, speed 2932 rpm, power factor 0.94, and 77% efficiency.