旋转电机第9部分:噪声限值

[中文适用范围]： 本部分 IEC 60034 规定了旋转电机声功率级的测定方法，并规定了工厂验收测试时的最大 A 加权声功率级，适用于符合 IEC 60034-1 的电网供电旋转电机，其冷却方法符合 IEC 60034-6，防护等级符合 IEC 60034-5，并具有以下特性： - 标准设计，交流或直流，无额外的特殊电气、机械或声学修改以减少声功率级 - 额定输出从 1 kW（或 kVA）到 5500 kW（或 kVA） - 额定转速不超过 3750 min⁻¹ 本文件的目的是确定标准设计旋转电机空气传播噪声的最大 A 加权声功率级（LWA，单位为分贝，dB），作为功率、速度和负载的函数，并规定测量方法和适当的测试条件，以提供对机器噪声的标准化评估，直至达到规定的最大声功率级。本文件不提供对音调特性的校正。 在某些应用中，如听力保护计划，可能需要距离机器的声压级。第 7 条提供了基于标准化测试环境的此类程序的信息。 [外文原描述]： IEC 60034-9:2021 CMV contains both the official standard and its commented version. The commented version provides you with a quick and easy way to compare all the changes between IEC 60034-9:2021 edition 5.0 and the previous IEC 60034-9:2003+AMD1:2007 CSV edition 4.1. Futhermore, comments from IEC TC 2 experts are provided to explain the reasons of the most relevant changes. IEC 60034-9:2021 specifies test methods for the determination of sound power level of rotating electrical machines and specifies maximum A-weighted sound power levels for factory acceptance testing of network-supplied, rotating electrical machines in accordance with lEC 60034-1, having methods of cooling according to lEC 60034-6 and degrees of protection according to lEC 60034-5, and having the following characteristics: - standard design, either AC or DC, without additional special electrical, mechanical, or acoustical modifications intended to reduce the sound power level - rated output from 1 kW (or kVA) up to and including 5 500 kW (or kVA) - rated speed not greater than 3 750 min–1 This fifth edition cancels and replaces the fourth edition, published in 2003 and its amendment 1, published in 2007. This edition includes the following significant technical changes with respect to the previous edition: a) In Table 2 and Table 3 cooling methods IC01, IC11, IC21 and IC31, IC71, IC81 are now covered. b) This edition adds Table 3 for 60 Hz machines, whereas Table 2, which covers only 50 Hz machines, has no change in levels. c) In Table 3, grade A is added to harmonize the highest levels seen in IEC and NEMA, whereas grade B was added to harmonize the lowest, more restrictive levels seen in IEC and NEMA. d) The clause “Determination of noise increments caused by converter supply” has been shifted to Annex B and renamed “Information on typical noise increments caused by converter supply”.