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一、概况新修订的 GB 755-81电机基本技术要求中,对电机噪声限值划分为:N(合格)、R(良好)、S(优)和 E(低噪声)四个等级,每级间差5分贝。原一机部电工总局的“中小型电机产品质量分等规定”中直流电机噪声考核要求为:一等品,在5千瓦以下达 R 级,5千瓦以上达 N 级;优等品,30千瓦以下,应达 S 级,30千瓦以上达 R 级。我厂对 Z 2系列直流电机进行普测,其结果为:3000转/分电机全部达不到 N 级标准,1500转/分电机5千瓦以下,均达不到一等品标准。为此,在市电机公司和厂总师领
I. Overview The revised GB 755-81 motor basic technical requirements, the motor noise limits are divided into: N (pass), R (good), S (excellent) and E (low noise) four levels, each level 5 dB difference between. The requirements of the DC motor noise assessment in the Regulations on the Classification of Small and Medium-sized Motor Products of the Ministry of Electrical Engineering of the former Ministry are as follows: First-class products reach Grade R at 5 kilowatts and reach Grade N at 5 kilowatts or above; superior products at 30 kilowatts or less , Should reach S level, 30 kilowatts above R level. Our factory carries on the general survey to the Z 2 series direct current machine, the result is: 3000 rev / the electric motor all can not reach the N level standard, 1500 rev / min electrical machinery 5 kilowatts below, all can not achieve first-class product standard. To this end, the city motor company and general manager collar