Impact of 2D and 3D Rotor Eccentricity on End Winding Mechanics Behavior in Synchronous Generators

IF 1.6 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Journal of Electrical Engineering & Technology Pub Date : 2024-08-21 DOI:10.1007/s42835-024-01997-3
Ming-Xing Xu, Yu-Ling He, Wen Zhang, Wen-Jie Zheng, De-Rui Dai, Xiang-Ao Liu, David Gerada
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Abstract

Investigations on static air-gap eccentricity (SAGE) faults about magnetic field variations, current/ voltage changes, and stator/ rotor vibrations have been widely carried out, while the mechanical properties of the end windings have been rarely studied, especially in 3D eccentricity cases. This article provides a detailed study on the stator end winding mechanics behavior in synchronous generators at typical rotor eccentricity running conditions. Such mechanics behavior includes not only the electromagnetic force (EF) properties, but also the end winding vibrations as well as the stress/strain/deformation responses due to the uneven EF excitation. The typical rotor eccentricity running conditions include: 1) radial static air-gap eccentricity (RSAGE), 2) axial static air-gap eccentricity (ASAGE), and 3) hybrid static air-gap eccentricity (HSAGE). The theoretical analysis, finite element analysis calculation and experimental verification are performed respectively, by taking a 5kVA synchronous generator as the research object in this paper. It is shown that in normal and SAGE cases, the end winding EF/vibration contains the DC component and even harmonics, especially the 2nd harmonic. RSAGE increases the end winding EF/vibration, whereas ASAGE increases the end winding EF/vibration at the extended end of the rotor while decreasing the EF/vibration on the retracted end. Under HSAGE, both RSAGE and ASAGE will affect the variation trend of end winding EF/vibration with the rule of single direction SAGE fault. The nose part and the joint to connect the end part and the linear sections are the most dangerous positions to afford the mechanics responses, and the occurrence of SAGE will make these parts more vulnerable.

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二维和三维转子偏心率对同步发电机端部绕组力学行为的影响
有关静态气隙偏心(SAGE)故障的磁场变化、电流/电压变化以及定子/转子振动的研究已广泛开展,而有关端部绕组机械特性的研究却很少,尤其是在三维偏心情况下。本文详细研究了同步发电机在典型转子偏心运行条件下的定子端部绕组力学特性。这种力学行为不仅包括电磁力(EF)特性,还包括端部绕组振动以及 EF 不均匀激励引起的应力/应变/变形响应。典型的转子偏心运行条件包括1) 径向静态气隙偏心 (RSAGE),2) 轴向静态气隙偏心 (ASAGE) 和 3) 混合静态气隙偏心 (HSAGE)。本文以一台 5kVA 同步发电机为研究对象,分别进行了理论分析、有限元分析计算和实验验证。结果表明,在正常情况和 SAGE 情况下,端部绕组 EF/ 振动包含直流分量和偶次谐波,尤其是 2 次谐波。RSAGE 增加了末端绕组的 EF/振动,而 ASAGE 增加了转子伸出端的末端绕组 EF/振动,同时降低了缩回端的 EF/振动。在 HSAGE 条件下,RSAGE 和 ASAGE 都会影响端部绕组 EF/ 振动的变化趋势,其规律是单向 SAGE 故障。机头部分和连接端部与线性部分的接头是对力学响应最危险的位置,SAGE 的发生将使这些部分更加脆弱。
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来源期刊
Journal of Electrical Engineering & Technology
Journal of Electrical Engineering & Technology ENGINEERING, ELECTRICAL & ELECTRONIC-
CiteScore
4.00
自引率
15.80%
发文量
321
审稿时长
3.8 months
期刊介绍: ournal of Electrical Engineering and Technology (JEET), which is the official publication of the Korean Institute of Electrical Engineers (KIEE) being published bimonthly, released the first issue in March 2006.The journal is open to submission from scholars and experts in the wide areas of electrical engineering technologies. The scope of the journal includes all issues in the field of Electrical Engineering and Technology. Included are techniques for electrical power engineering, electrical machinery and energy conversion systems, electrophysics and applications, information and controls.
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