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为解决水轮发电机组转动部分电磁磁力减载过程中存在磁饱和严重和减载力不足的问题,在对单环式电磁减载结构研究的基础上,提出了多环改进电磁结构。应用电磁磁力减载原理,结合实例利用有限元法分析了单环式电磁减载结构存在的问题,并研究了多环结构布线槽个数和齿槽分配关系对电磁减载力的影响。证实了多环结构能有效解决单环结构的磁饱和问题,同时多环改进结构可大幅增加电磁力,能够满足减载要求,进而减轻推力轴承的轴向负荷,提高水轮发电机组运行的可靠性。
In order to solve the problem of severe magnetic saturation and insufficient load shedding during the electromagnetic load shedding during the rotating part of hydro-generator, a multi-ring improved electromagnetic structure was proposed based on the research of single-loop electromagnetic load shedding. Based on the principle of electromagnetic load shedding, the existing problems of single-loop electromagnetic load shedding structure are analyzed by finite element method. The influence of the relationship between the number of multi-ring structure cabinets and the distribution of cogging on electromagnetic load shedding force is studied. It is confirmed that the multi-ring structure can effectively solve the problem of magnetic saturation of the single-ring structure. Meanwhile, the multi-ring improved structure can greatly increase the electromagnetic force and can satisfy the requirements of load shedding, thereby reducing the axial load of the thrust bearing and improving the reliability of the hydroelectric generating set Sex.