考虑屏蔽套失效的主泵电机建模及性能分析  

Modeling and Performance Impact Analysis of Main Pump Canned Motor Considering Can Failure

作　　者：刘能青 向学位 陈智[2] 李辉[1] 蒋鹏[1] Liu Nengqing;Xiang Xuewei;Chen Zhi;Li Hui;Jiang Peng(State Key Laboratory of Power Transmission Equipment Technology Chongqing University, Chongqing 40044 China;Key Laboratory of Nuclear Reactor System Design Technology Nuclear Power Institute of China ,Chengdu 610213 China)

机构地区：[1]输变电装备技术全国重点实验室(重庆大学),重庆400044 [2]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《电工技术学报》2024年第S1期25-36,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(U2267206)。

摘　　要：屏蔽套是主泵电机的关键部件,由于屏蔽套受到多种应力作用容易发生失效及难以加装相关传感器观测屏蔽套状态,因此研究屏蔽套失效对主泵电机性能的影响很重要。目前,缺乏相关屏蔽套失效模型和失效对主泵电机性能的影响分析,该文提出了考虑屏蔽套失效的主泵电机建模及性能影响分析方法。首先,考虑屏蔽套鼓包、磨损与破裂三种常见失效模式,分别建立有限元模型,分析不同失效模式和失效程度对主泵电机电磁转矩、定子绕组电流、气隙磁通密度、反电动势和屏蔽套涡流损耗等性能的影响规律;其次,针对失效对屏蔽套涡流损耗的影响,提出考虑不同失效模式的屏蔽套涡流损耗计算解析式;最后,对屏蔽套不同失效模式和失效程度的性能变化进行比较分析。结果表明,屏蔽套失效对主泵电机涡流损耗的影响较为明显,对主泵电机的其他性能影响不明显;考虑不同屏蔽套失效涡流损耗解析计算方法是有效的,屏蔽套上的涡流损耗与屏蔽套失效的程度呈线性关系。The can is a critical component of the main pump canned motor,located within the air gap of the main pump.It endures various stresses such as electromagnetic force,coolant pressure,and thermal stress,making it prone to failure.Due to the limited installation space,it is challenging to install relevant sensors to monitor its condition,thus making the study of can faults and their impact on the performance of the main pump canned motor significantly important.Currently,there is a lack of models and analysis focusing on can faults and their effects on the performance of the main pump canned motor.This paper proposes a modeling method that considers can faults and analyzes their impact on the performance of canned motors for main pumps.Firstly,to accurately calculate the performance of the main pump canned motor,a finite element model of the main pump canned motor was established.This model considers three common failure modes of the can:bulging,wear,and cracking.Maxwell finite element models of the main pump canned motor were developed for each type of can fault.Based on finite element calculation results,the impact of different can fault modes and varying degrees of severity on the performance of the main pump canned motor was analyzed.The study revealed that can failures have a significant effect on the eddy current loss within the can,but have minimal impact on back electromotive force and winding current,and relatively little effect on torque and air gap magnetic flux density.Finally,to address the impact of can failures on eddy current losses within the can,an analytical expression for eddy current loss calculation was proposed,considering the cross-sectional area variations of the can due to different fault modes.The changes in eddy current losses under different fault modes and severity levels were analyzed using this analytical expression and compared with simulation results.The results indicate that:(1)When the main pump motor can fails,the maximum change rate of electromagnetic torque is 2.108%,the maximum

关 键 词：屏蔽套 主泵电机 失效模拟 性能分析 涡流损耗 

分 类 号：TM346[电气工程—电机]