摘要
定子铁心磁化试验时会产生噪声,主要是由于定子铁心硅钢片在交变作用磁通下产生振动引起的。提出一种利用噪声对定子铁心进行质量判别的方法,以检验定子铁心装配质量,查找是否存在铁心压紧不实、松动、局部空腔等问题。在定子铁心磁化试验时,进行噪声声压级、1/3倍频程频谱、局部高点噪声测试。以定子铁心在冷态和热态的噪声声压级差值不大于5d B、冷态和热态的噪声1/3倍频程频谱图无异常差别、最大局部噪声差值不大于3d B,作为噪声对定子铁心质量判别的依据。
In case of magnetization test,generator stator core produces noise, the main reason is the laminated core vibration under the alternating magnetic flux. In this paper, a method of stator core quality judgment by noise is proposed to check the core assembly quality, and find out if there is looseness or partial void. During magnetization test, A-Weighted sound pressure level, one-third octave frequency spectrum and partial noise are measured. There are three judgment standards of the stator core quality. First of all, the difference of the noise sound pressure level between cold state and hot state is not more than 5dB. Secondly, there is no special difference of one-third frequency spectrum under cold state and hot state, and thirdly the maximum difference of partial noise is not more than 3dB.
出处
《大电机技术》
2017年第1期16-19,共4页
Large Electric Machine and Hydraulic Turbine
关键词
定子铁心
磁化试验
噪声
质量判别
stator core
magnetization test
noise
quality judgment
