磁热固耦合作用下的同步发电机转子铁芯损耗及温升特性分析  

Rotor Core Loss&Temperature Rise Properties in Synchronous Generators under Magnet-heat-solid Coupling Action

作　　者：何玉灵[1] 武钰[1] 王烁 张超[1] 白洁[1] HE Yuling;WU Yu;WANG Shuo;ZHANG Chao;BAI Jie(Hebei Key Laboratory of Electric Machinery Health Maintenance&Failure Prevention,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学河北省电力机械设备健康维护与失效预防重点实验室,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2021年第6期55-62,共8页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51777074);河北省自然科学基金(E2020502032);中央高校基本科研业务费专项资金资助项目(2020MS114,2018YQ03);河北省第三批青年拔尖人才支持计划([2018]-27).

摘　　要：为了分析同步发电机在电磁-温度-应力单向耦合作用下的转子铁芯损耗及温升特性。首先从电磁场理论入手,对发电机在正常情况转子铁芯损耗进行了分析,确立了发电机各部分的导热系数及各表面的散热系数。然后建立了CS-5型发电机的三维有限元模型,运用Maxwell-ANSYS workbench联合仿真计算了发电机转子铁芯损耗曲线及表面温度场分布,并将转子铁芯温度场仿真结果作为热载荷激励条件,计算了转子铁芯热应力分布。最后,在CS-5机组上实测了转子铁芯温度,所得实验结果与有限元计算结果基本一致。研究结果确定了转子的温度场分布,以及发电机正常运行时应该重点监测的温升部位,同时确定了转子铁芯热应力的峰值点,为发电机设计及转子热应力监控提供了一定的参考依据。This paper is to analyze the rotor core loss and temperature rise characteristics of the synchronous generator under the unidirectional electromagnetic-temperature-stress coupling.First,we analyzed the generator rotor core loss under normal conditions based on the Electromagnetic Theory to establish the thermal conductivity of each part of the motor and the heat dissipation coefficient of each surface.Then the three-dimensional finite element model of the CS-5 generator was established.We used Maxwell-ANSYS workbench joint simulation to calculate the generator rotor core loss curve and distribution of surface temperature field.With the simulation result of the rotor core temperature field as the thermal load excitation condition,we also calculate the thermal stress distribution of rotor core.Finally,the rotor core temperature was measured on the CS-5 unit,and the results are basically consistent with that of finite element calculation.Through the experiment,we get the temperature field distribution of the rotor and the temperature rise parts that should be monitored during normal operation of the motor.At the same time,the peak point of the thermal stress of the rotor core is found,which provides a certain reference for the motor design and the monitoring of the thermal stress of the rotor.

关 键 词：同步发电机 转子铁芯 损耗 温度 热应力 

分 类 号：TM31[电气工程—电机]