水轮发电机转子偏心引起的非线性电磁振动  

Nonlinear Electromagnetic Vibrations in Hydro-generators with Eccentric Rotors

作　　者：姚大坤[1] 邹经湘[1] 黄文虎[1] 曲大庄[1] 

机构地区：[1]哈尔滨工业大学,哈尔滨150001

出　　处：《应用力学学报》2006年第3期334-337,共4页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金项目(59493700);国家"十五"重大技术装备研制项目(ZZ01010403)

摘　　要：由于机械和电磁相互耦合,水轮发电机的电磁振动具有强非线性特征。根据不平衡磁拉力与转子偏心的非线性函数关系,通过简化的各向同性的单圆盘转子系统,建立了水轮发电机转子电磁振动的非线性系统。利用非线性振动理论的多尺度方法,从理论上分析了该系统强迫振动的稳态响应,进而研究了水轮发电机转子偏心引起的电磁振动。研究发现不平衡磁拉力使系统的涡动频率下降,使运动的中心发生变化;并且会引起两倍转频的振动。最后用模型转子仿真试验的结果验证了这些理论分析的结论。Electromagnetic vibration in hydro-generator is endowed with nonlinear characteristic due to the mechanic and electromagnetic coupling. According to nonlinear relation of unbalanced magnetic pull with respect to rotor eccentricity,a nonlinear system represented by a symmetrical disk is set up to express electromagnetic vibrations of hydro-generator rotors,the steady-state responses of forced vibrations of the nonlinear system are analyzed theoretically by the method of multiple scales,thus the electromagnetic vibrations of hydro-generators with eccentric rotors is investigated further. The result indicates that the unbalanced magnetic pull declines the critical speed of a rotor,changes center of motion,and causes vibration of twice operating speed,and the conclusions are verified by a simulating test.

关 键 词：水轮发电机 非线性振动 偏心 不平衡磁拉力 

分 类 号：TM312[电气工程—电机] O322[理学—一般力学与力学基础]