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Investigation of Radiative Interference in Variable-Frequency Drives (VFD) Cover

Investigation of Radiative Interference in Variable-Frequency Drives (VFD)

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Open Access
|May 2025

Abstract

Alternating current (AC) motor applications are commonly controlled using variable-frequency drives (VFDs), which provide benefits such as enhanced system controllability and improved energy efficiency. Despite these advantages, VFDs are associated with challenges, particularly the generation of electromagnetic interference (EMI). This study examines the radiative EMI characteristics of VFDs and evaluates straightforward technical solutions, with a primary emphasis on shielding techniques, to mitigate their impact. For a low-power VFD, a test system was specifically designed for this investigation. The analysis revealed that the most significant broadband EMI emissions originated from the motor cable and the VFD unit itself. By implementing appropriate shielding strategies, we substantially reduced the EMI signal strength, with some cases demonstrating complete suppression. Furthermore, this experimental setup will serve as a practical component in laboratory exercises for undergraduate students, offering hands-on experience with EMI analysis and mitigation methodologies.

DOI: https://doi.org/10.2478/lpts-2025-0019 | Journal eISSN: 2255-8896 | Journal ISSN: 0868-8257
Language: English
Page range: 22 - 30
Published on: May 27, 2025
Published by: Institute of Physical Energetics
In partnership with: Paradigm Publishing Services
Publication frequency: 6 times per year

© 2025 J. Kallunki, published by Institute of Physical Energetics
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.