基于气隙特征值的发电机定子低频振动分析模型

Low Frequency Vibration Analysis Model for the Stator of Generator Based on Air Gap Eigenvalue

提出气隙特征值的概念,对发电机动态气隙进行傅里叶分解,将得到的各阶次谐波分量定义为气隙特征值,为准确描述发电机气隙分布特征提供了量化指标,突破了目前只用圆度和偏心来反映气隙形貌的局限性。通过大量数据分析发现发电机气隙特征值与定子低频振动的关联关系,建立定子低频振动分析模型,该模型用于糯扎渡水电站8号机组定子低频振动处理,取得了预期效果。

The concept of air gap eigenvalue is firstly proposed, and then the Fourier decomposition is used to decompose the dynamic air gap of generator. The harmonic components of each order are defined as the air gap eigenvalue, which provides a quantitative index for accurately describing the air gap distribution characteristics of generator and breaks through the limitation that only roundness and eccentricity are used to reflect the air gap morphology at present. The relationship between generator air gap eigenvalue and stator low-frequency vibration is found through a large number of data analysis. A stator low-frequency vibration analysis model is established. The model is applied to the stator low frequency vibration treatment of unit 8 of Nuozhadu Hydropower Station, and the better treatment results are obtained.