Effect of axial air gap asymmetric fault on the characteristic of electromagnetic torque in generators

doi:10.3969/j.issn.1000-1565.2025.01.001

Abstract

Abstract: Air gap eccentricity is a common mechanical fault in generators, the different operating parameters under air gap eccentricity will have an impact on the electromagnetic characteristics of generators. Previous researches mainly focused on the influence of axial air gap uniform eccentricity on the electromagnetic torque fluctuation characteristic. However, rare studies have considered the effects of variations in the axial air gap non-uniform eccentricity(inclination eccentricity). As a supplement, this paper comprehensively analyzes the effect of key operating parameters on electromagnetic torque characteristic in- DOI:10.3969/j.issn.1000-1565.2025.01.001轴向气隙非对称故障对发电机电磁转矩特性的影响何玉灵^1,2,付滋翔¹,代德瑞¹,白洪华³,黄伟灵³(1.华北电力大学机械工程系,河北保定 071003;2.华北电力大学苏州研究院,江苏苏州 215123;3.浙江振兴阿祥集团,浙江湖州 313000)摘要:气隙偏心是发电机中常见的一种机械故障,气隙偏心下不同运行参数将对发电机的电磁特性造成影响.已有研究主要关注轴向气隙均匀偏心对电磁转矩波动的影响,较少关注轴向气隙非均匀偏心(倾斜偏心)所造成的影响.作为补充,该文全面分析了倾斜偏心下关键运行参数差异对发电机电磁转矩波动特性的影响.其中,关键运行参数主要包括倾斜偏心程度及发电机负载差异.整体工作以一台5 kVA的故障模拟发电机为研究对象,通过实验验证了理论分析和有限元分析得到的结果.结果表明:倾斜偏心会为电磁转矩带来额外的二倍频成分,且随着倾斜偏心角度的增大,电磁转矩的直流分量和二倍频成分都增大;随着负载的增加,发电机电磁转矩波动程度加剧,且直流分量和二倍频成分也将增大.关键词:发电机;负载差异;气隙非对称;电磁转矩中图分类号:TM311 文献标志码:A 文章编号:1000-1565(2025)01-0001-09Effect of axial air gap asymmetric fault on the characteristic of electromagnetic torque in generators HE Yuling^1,2, FU Zixiang¹, DAI Derui¹, BAI Honghua³, HUANG Weiling³(1. Department of Mechanical Engineering, North China Electric Power University, Baoding 071003, China; 2. Suzhou Research Institute, North China Electric Power University, Suzhou 215123, China; 3. Zhejiang Zhenxing A Xiang Group Co., Ltd., Huzhou 313000, China)Abstract: Air gap eccentricity is a common mechanical fault in generators, the different operating parameters under air gap eccentricity will have an impact on the electromagnetic characteristics of generators. Previous researches mainly focused on the influence of axial air gap uniform eccentricity on the electromagnetic torque fluctuation characteristic. However, rare studies have considered the effects of variations in the axial air gap non-uniform eccentricity(inclination eccentricity). As a supplement, this paper comprehensively analyzes the effect of key operating parameters on electromagnetic torque characteristic in- 收稿日期:2024-03-29;修回日期:2024-05-07 基金项目:国家自然科学基金资助项目(52177042);河北省自然科学基金资助项目(E2022502003;E2021502038);中央高校基本科研业务费专项基金资助项目(2023MS128);河北省第三批青年拔尖人才支持计划(［2018］-27);河北省高层次人才项目(B20231006);苏州市社会发展科技创新项目(SS202134);河北省研究生创新能力培养项目(CXZZBS2023149);南太湖精英计划创新人才团队项目第一作者:何玉灵(1982—),男,华北电力大学教授,博士生导师,博士,主要从事电站设备状态检测及其故障诊断. E-mail:heyuling1@163.com 通信作者:付滋翔(2000—),男,华北电力大学在读硕士研究生,主要从事发电机设备状态检测及其故障诊断. E-mail:fuzixiang2023@163.com 第1期何玉灵等:轴向气隙非对称故障对发电机电磁转矩特性的影响河北大学学报(自然科学版) 第45卷generator under inclination eccentricity. The key operating parameters include the degree of inclination eccentricity and generation load differences. The whole work was carried out on a 5 kVA fault simulated generator and the results obtained from the theoretical and finite element analysis were verified through experiments. It is shown that the inclined eccentricity introduces an extra double frequency component to the electromagnetic torque and that both the DC component and the second frequency component of the electromagnetic torque increase as the eccentricity angle grow. In addition, as the load increases, the fluctuating characteristics of the generators electromagnetic torque will be increased, and both the DC component and the 2nd harmonic will be increased as well.

Key words: generator, load differences, air gap asymmetric, electromagnetic torque

CLC Number:

TM311

HE Yuling, FU Zixiang, DAI Derui, BAI Honghua, HUANG Weiling. Effect of axial air gap asymmetric fault on the characteristic of electromagnetic torque in generators[J]. Journal of Hebei University(Natural Science Edition), 2025, 45(1): 1-9.

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