The maximum allowable sound power level (measured in decibels, dB) increases with the power output (kW) and the rotational speed (RPM) of the machine. High-speed motors typically have higher noise limits due to windage and fan noise. 2. Cooling Methods
If you have found yourself searching for an you are likely looking to verify compliance, specify a new motor, or understand the acoustic limits of rotating electrical machines. This article provides a deep dive into the content of this essential international standard, explaining why it matters and how to interpret the data found within the document. iec 60034-9 pdf