1000 MW水轮发电机转子轴偏折对不平衡磁拉力和磁力矩的影响  

Influence of rotor shaft deflection on unbalanced magnetic pull and magnetic torque of a 1000 MW hydroelectric generator unit

作　　者：康永林 张继文[2] 王文亮 黄星星 刘兴民 王正伟[2] KANG Yonglin;ZHANG Jiwen;WANG Wenliang;HUANG Xingxing;LIU Xingmin;WANG Zhengwei(China Three Gorges Construction(Group)Co.,Ltd.,Chengdu,Sichuan 610000,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;S.C.I.Energy(Swiss),Future Energy Research Institute,Meilen,Zurich 8706,Switzerland)

机构地区：[1]中国三峡建工(集团)有限公司,四川成都610000 [2]清华大学能源与动力工程系,北京100084 [3]SCI能源未来能源研究所,瑞士苏黎世州迈伦8706

出　　处：《排灌机械工程学报》2025年第4期371-378,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：中国三峡建工(集团)有限公司“1000 MW水轮发电机组动力特性多场耦合研究”(JGJDO322003)。

摘　　要：1000 MW水轮发电机组容量和体积巨大,其性能和可靠性对电力供应及电网稳定性至关重要.在发电机安装和运行过程中,转子轴偏折是面临的核心问题之一,它会带来不平衡磁拉力和磁力矩,进而引起机组不良振动和发热.文中通过瞬态有限元方法来计算发电机内部磁场,结合理论分析与计算结果,揭示发电机转子轴偏折对机组不平衡磁拉力和磁力矩的影响.结果显示,以转子中心作为中心点的轴偏折会对磁拉力的圆周分布和转矩的大小产生影响.此外,还将产生额外的磁力矩用于抵抗偏折的变化,磁力矩的变化与偏折角度呈现线性关系.研究揭示了磁拉力和磁力矩与偏折角度之间的关系,为安装偏差的高精度控制提供理论基础.The 1000 MW hydroelectric generator unit has a huge capacity and volume,and its performance and reliability are crucial to power supply and grid stability.During the installation and operation of the generator,the deflection of the rotor shaft is one of the core problems,which triggers the generation of unbalanced magnetic pull and magnetic torque,thereby causing undesirable vibration and heating of the unit.Hence,a transient finite element method was used to calculate the internal magnetic field of the generator,and the theoretical analysis and calculation results were combined to reveal the influence of rotor shaft deflection on the unbalanced magnetic pull and magnetic torque of the generator unit.The results show that the shaft deflection with the rotor center as the center point will affect the circumferential distribution of the magnetic pull force and the magnitude of the torque.In addition,an additional torque will be generated to resist the change in deflection,and the change in torque shows a linear relationship with the deflection angle.The conclusions of the study reveal the relationship between magnetic pull,magnetic torque,and deflection angle,providing a theoretical basis for further reducing the unbalanced magnetic pull and magnetic torque.

关 键 词：1000 MW水轮发电机 转子轴偏折 不平衡磁拉力 磁力矩 电磁场有限元分析 

分 类 号：TM351[电气工程—电机]