IEC 60034-9, titled "Rotating electrical machines – Part 9: Noise limits," is the primary international standard governing airborne noise emissions for standard electric motors and generators. It establishes maximum allowable sound power levels ( LWAcap L sub cap W cap A end-sub
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Outdated Information: The latest version is IEC 60034-9:2021 (Edition 5.0). "Free" sites often host the 2003 or 1972 versions, which are missing critical updates for 60 Hz machines and newer cooling methods.
Variable Speed Considerations: Information regarding noise increments caused by converter (VFD) supplies was shifted to a dedicated annex to help engineers account for the acoustic changes during variable-speed operation. IEC 60034-9, titled "Rotating electrical machines – Part
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IEC 60034-9:2021 - Noise Limits for Rotating Electrical Machines "Free" sites often host the 2003 or 1972
The latest edition (5.0), published in 2021, specifies maximum A-weighted sound power levels for factory acceptance testing of rotating electrical machines. IEC Webstore