关键词: 火电厂辅机设备, 浆液循环泵, 转子偏心故障, 气隙磁密, 电磁激振力

Abstract: To analyze the variation patterns of electromagnetic excitation forces in the key auxiliary equipment - slurry circulation pump drive motor in the static and dynamic eccentric faults of the desulfurization system in thermal power plants,and to provide fault sample data for subsequent fault early warning,this study takes an induction motor of a slurry circulation pump in Hanchuan power plant as an example. Characteristic parameters of the air-gap flux density and electromagnetic excitation force under static and dynamic eccentricity faults are derived. Finite element models of the
prototype under different eccentricity conditions are established. The spatiotemporal distribution data of the air-gap flux density and electromagnetic excitation force under healthy,static eccentricity,and dynamic eccentricity operating conditions are calculated. Under healthy conditions, the fundamental air-gap flux density amplitude is 1. 256 5 T, while under 40% static and dynamic eccentricity faults, the fundamental air-gap flux density amplitudes are 1. 256 3 T and 1. 256 6 T, respectively. The correctness of the analytical model is verified, and the general patterns of characteristic magnetic flux density harmonics and electromagnetic force harmonics in asynchronous motors under static and dynamic eccentricity are obtained. This work lays the foundation for in-depth investigation into the abnormal vibration and noise characteristics of slurry circulation pump motors and other auxiliary equipment in power plants under eccentricity faults. It has practical significance for enhancing the safe and stable operation of auxiliary equipment in power plants.

Key words: auxiliary equipment in thermal power plants, slurry circulation pump, rotor eccentricity faults, air-gap flux density, electromagnetic excitation force