轴径向静态偏心故障下外转子永磁发电机电磁转矩特性分析  

Analysis of electromagnetic torque characteristics of external rotor permanent magnet generator with axial radial static eccentricity fault

作　　者：何玉灵[1] 王世云 孙凯 蒋梦雅 慈铁军[1] 何敏 张娜 HE Yuling;WANG Shiyun;SUN Kai;JIANG Mengya;CI Tiejun;HE Min;ZHANG Na(Department of Mechanical Engineering,North China Electric Power University,Baoding 071003,China;CHINO Pharmaceutical Group Shijiazhuang Pharmaceutical,Shijiazhuang 050000,China)

机构地区：[1]华北电力大学机械工程系,河北保定071003 [2]石药集团中诺药业有限公司,河北石家庄050000

出　　处：《电机与控制学报》2024年第1期12-25,共14页Electric Machines and Control

基　　金：国家自然科学基金面上项目(52177042);河北省第三批青年拔尖人才支持计划([2018]-27);苏州市社会发展科技创新资助项目(SS202134)。

摘　　要：对外转子永磁发电机轴径向静态偏心故障下的电磁转矩特性进行了理论解析、仿真计算和实验验证。首先,在考虑齿槽效应影响条件下,引入磁导修正系数ε(θ),推导出轴径向静态偏心前后气隙磁密表达式,并考虑绕组分布情况,构建一种新型的永磁发电机轴径向静态偏心故障下相电流数学模型,在此基础上得到轴径向偏心下电磁转矩解析表达式。其次,通过有限元仿真计算得到外转子永磁发电机轴径向静态偏心下的电磁转矩波动特性。最后,在一台外转子永磁发电机上通过故障模拟实验实例印证了解析分析和仿真计算结果。结果表明:相较于正常情况,径向偏心时,电磁转矩以直流、二倍频、四倍频成分为主,随着偏心程度的加剧,电磁转矩的直流、二倍频、四倍频成分幅值将随着增大;轴向偏心时,电磁转矩谐波成分不变,随着偏心程度的加剧,各谐波成分幅值将随着减小。对外转子永磁发电机气隙偏心故障分析的一个重要补充,对此类问题的现场检测和鉴定具有参考价值。The electromagnetic torque characteristics of external rotor permanent magnet generator under axial radial static eccentricity fault were analyzed theoretically,simulated and verified experimentally.Firstly,the expression of air-gap magnetic density before and after axial radial static eccentricity was derived by introducing the magnetic permeability correction coefficientε(θ),and the winding distribution was considered,a new mathematical model of three-dimensional phase current of permanent magnet generator with air-gap eccentricity fault was presented,and the analytical expression of electromagnetic torque under radial static eccentricity fault was obtained.Secondly,the electromagnetic torque ripple characteristics of external rotor permanent magnet generator under axial radial static eccentricity were obtained by finite element method(FEM).Finally,the analytical analysis and simulation results were verified by a fault simulation experiment on an external rotor permanent magnet generator.The results show that when the rotor is radial eccentric,the electromagnetic torque is mainly composed of DC component,the 2nd harmonic component and the 4th harmonic component,and with the increase of eccentricity,the amplitude of DC component,the 2nd harmonic component and the 4th harmonic component will increase.When the rotor is axially eccentric,the harmonic components of the electromagnetic torque will not change,and with the increase of the degree of eccentricity,the amplitude of each harmonic component of electromagnetic torque will decrease.It is an important supplement to the analysis of air-gap eccentricity fault of external rotor permanent magnet generator.

关 键 词：外转子永磁发电机 轴径向静态偏心 气隙磁密 相电流 电磁转矩 故障诊断 

分 类 号：TM313[电气工程—电机]