气隙静偏心故障对永磁风力发电机定子绕组振动的影响  

Impact of static air gap eccentricity fault on stator winding vibration in permanent magnet wind generator

作　　者：何玉灵[1] 徐明星 张文[1] 郑文杰[1] 代德瑞 邢云 HE Yuling;XU Mingxing;ZHANG Wen;ZHENG Wenjie;DAI Derui;XING Yun(Department of Mechanical Engineering,and the Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention,North China Electric Power University,Baoding 071003,Hebei,China)

机构地区：[1]华北电力大学机械工程系暨河北省电力机械装备健康维护与失效预防重点实验室,河北保定071003

出　　处：《中国工程机械学报》2024年第1期83-88,共6页Chinese Journal of Construction Machinery

基　　金：国家自然科学基金资助项目(51777074,52177042);河北省自然科学基金资助项目(E2020502032);中央高校基本科研业务费专项基金(2020MS114);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项目(SS202134)。

摘　　要：端部绕组振动是导致绝缘磨损和退化的关键因素之一,综合分析永磁风力发电机气隙静偏心故障前后定子端部绕组的振动特性。首先,推导正常情况和气隙静偏心故障下的气隙磁通密度,得到端部绕组的电磁力表达式;然后,基于电磁-结构耦合模型,得出绕组电磁力、应力应变等力学响应特性;最后,实测3 kW故障模拟发电机在正常和气隙静偏心故障情况下的定子绕组振动响应。实验结果与理论分析、有限元计算结果基本吻合。结果表明:气隙磁通密度随偏心程度的增加而增大(气隙减小处),随偏心故障加剧端部绕组电磁力/振动增大,绕组电磁力/振动以偶倍频为主。另外,直线段绕组和端部绕组的连接处为振动磨损危险位置。End winding vibration is one of the key factors that lead to insulation wearing and degrading.This paper presents a comprehensive study on the stator end winding vibration properties in permanent magnet wind generators before and after static air gap eccentricity cases.Firstly,the air gap magnetic flux density under normal and static air gap eccentricity cases is derived,on this basis,the expression of the end winding electromagnetic force is obtained.Then,the winding electromagnetic forces and response characteristics,such as stress and strain,are based on a coupled electromagnetic-structural model.Finally,the stator winding vibration response of the 3 kW fault simulated generator in normal and static air gap eccentricity fault is measured.The experimental results are in general consistent with the theoretical analysis and finite element calculations.It is shown that the amplitude of magnetic flux density increases with the increase of the eccentricity degree(where the air gap is reduced).Electromagnetic forces/vibrations in the end windings will reinforce due to eccentric faults and the winding electromagnetic forces/vibrations are mainly even frequency dominated(100 Hz,200 Hz,…).In addition,the connection between the linear section and the end of winding is the dangerous position of vibration wear.

关 键 词：永磁风力发电机 气隙静偏心 电磁力 绕组振动 

分 类 号：TM311[电气工程—电机]