Ensuring that a purchased motor meets the noise specifications of a specific factory or local regulation.
Noise must be measured with the motor running at rated voltage and frequency, under conditions (or in some specific load conditions per Annex A). The PDF includes correction factors for background noise (any difference less than 3 dBA between ambient and motor noise invalidates the measurement). iec 60034-9 pdf
The enclosure type (IP rating) can also influence how sound is muffled or amplified, which the standard accounts for in its tables. Why You Need the IEC 60034-9 PDF Ensuring that a purchased motor meets the noise
The standard is the international benchmark for limiting and measuring airborne noise from rotating electrical machines . The current 5th edition (2021) establishes maximum A-weighted sound power levels for factory acceptance testing of standard AC and DC machines. Core Report: IEC 60034-9:2021 Overview Specification Details Scope The enclosure type (IP rating) can also influence