基于有限元模型的电机零部件与整机结构振动关联特性  

Structural vibration correlation feature analysis for parts and whole-machine of motor based on finite element model

作　　者：宾光富[1] 曾求洪 王钢[1] 李学军[1] 

机构地区：[1]湖南科技大学机械设备健康维护湖南省重点试验室,湖南湘潭411201

出　　处：《电机与控制学报》2016年第11期101-106,共6页Electric Machines and Control

基　　金：国家自然科学基金(51575176;51375162);湖南省科技重大专项(2015GK1003);湖南省教育厅优秀青年项目(15B085)

摘　　要：针对电机由多个复杂零部件组合而成导致系统振动故障难以准确诊断的问题,推导了含定子绕组、铁芯、端盖、转轴等电机零部件系统结构动力学方程,采用有限元法构建了某型异步电机零部件与整机系统动力学模型,并运用锤击法验证了建模法的有效性。通过分析无相对位移连接组件与整机有限元模型的固有频率值,得出底板、定子绕组、转轴、铁芯、前端盖及后端盖零部件对整机前三阶模态的贡献程度依次增大;研究零部件间连接方式对电机固有频率的影响,发现电机各阶固有频率随着零部件间连接刚度值增大而增加规律,这些可为电机振动故障分析与动力学设计提供参考。Due to motor usually contains many complex parts with various connection ways, it is difficult to diagnose accurately the motor with vibration faults. The structural dynamics equation of motor system including stator winding, stator core, shell cover, and rotation shaft was deduced. The dynamic model of the parts and whole-machine was built by the finite element method, and the effectiveness of the proposed method for modeling was verified by mode impact testing. The first three natural frequency for the compo- nents without relative displacement connection and whole-machine were calculated based on finite element model. The first three mode contribution of the backplane, stator winding, rotation shaft, stator core, front shell cover and back shell cover to the whole-machine is increased in turn. Moreover, the motor nat- ural frequency is also increased as the connection stiffness of the parts through the influence of the con- nection ways between the parts o n the motor natural frequency, which is of great importance and interest to the motor vibration fault analysis and dynamic design.

关 键 词：异步电机 有限元模型 关键零部件与整机 振动关联特性 模态分析与测试 

分 类 号：TH113.1[机械工程—机械设计及理论] TM303[电气工程—电机]