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Journals / Balkan Journal of Electrical and Computer Engineering / 2026 / Cilt: 12 Sayı: 1

Analysis of the Effect of Switching Frequency on Acoustic Noise in External Rotor Brushless DC Motors

Buğra Er(ISPARTA UYGULAMALI BİLİMLER ÜNİVERSİTESİ TEKNOLOJİ FAKÜLTESİ)0000-0002-3982-5654
Berk Demirsoy0009-0003-3489-7346
Ahmet Fenercioglu(BURSA TEKNİK ÜNİVERSİTESİ)0000-0002-1522-6868
Pages
98–104
Publication Date
2024-03-01
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

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.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Electric motors are actively used in various industries.
📊
Key Findings & Data:Despite better performance, including acoustic noise, than brushed motors, brushless motors still generate acoustic noise due to their mechanical, electrical, and electronic components.
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Conclusion & Impact: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.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:BLDC motor · Switching frequencies · Acoustic noise

Abstract

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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Cite This Article

Er, B., Demirsoy, B., Fenercioglu, A. (2024). Analysis of the Effect of Switching Frequency on Acoustic Noise in External Rotor Brushless DC Motors. Balkan Journal of Electrical and Computer Engineering, Cilt: 12 Sayı: 1, 98–104. https://doi.org/10.17694/bajece.1322919

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