大型充水式潜水电机定子端部绕组电磁振动研究  

Research on Electromagnetic Vibration of Stator End Winding of Large Water Filling Submersible Motor

作　　者：鲍晓华[1] 方勇[1] 程晓巍[1] 吕强[1] 

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《电工技术学报》2013年第11期138-146,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51177033;51377039);中央高校基本科研业务专项资金(2012HGZY0003)资助项目

摘　　要：大型充水式潜水电机的定子绕组在运行过程中受到电磁力作用发生振动,这会导致定子绕组绝缘层磨损、疲劳,绝缘性能下降,甚至引发事故。本文针对2 800kW充水式潜水电机,对定子端部绕组的电磁振动问题进行了研究,创建了端部绕组等效物理模型,对定、转子端部绕组电流层进行了傅里叶分析,用等效气隙回转电流代替气隙磁位差对端部磁场的影响;采用三维有限元方法建立了大型充水式潜水电机端部磁场的数学模型,推出了端部绕组各方向电磁力密度的静态分量及动态分量的解析式,给出了端部绕组电磁力的分布;通过数值计算,分别得到了端部绕组的固有频率及强迫振动的幅值。所得结论,可为工程实际问题的解决提供一定的帮助,并对端部绕组结构的优化设计和提高电机运行可靠性等方面提供参考。Stator windings of large water filling submersible motor suffer from electromagnetic force during operation, which causes the stator winding insulation abrasion, fatigue, degradation, or even leads to an accident. Electromagnetic vibration of stator end winding of 2 800kW water filling submersible motor is analyzed. Firstly, End winding equivalent physical model is proposed. The fundamental wave current density expression is presented by Fourier series and the equivalent air gap rotary current is substituted for air-gap magnetic potential difference of end magnetic field. Secondly, three-dimensional finite element method is used for the establishment of a magnetic field mathematical model. Then the analytical expression of the static component and dynamic component of the electromagnetic force density is deduced, which shows the distribution of electromagnetic force of the end windings. Finally, the natural frequency of end winding and the amplitude of forced vibration are obtained by numerical calculation. The result can provide certain help to solve practical problems in engineering, and can provide reference for end winding structure optimization design.

关 键 词：充水式潜水电机 端部磁场 电磁振动 有限元方法 固有频率 

分 类 号：TM301[电气工程—电机]