Effect of Static Rotor Eccentricity on End Winding Forces and Vibration Wearing

IF 0.9 Q4 ENGINEERING, MECHANICAL

International Journal of Rotating Machinery Pub Date : 2021-03-29 DOI:10.1155/2021/5554914

Hong-Chun Jiang, Guiji Tang, Yu‐Ling He, Kai Sun, Weijun Li, Lun Cheng

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引用次数: 4

Abstract

In order to study the vibration wearing regularity and the strength failure point of stator end windings before and after static rotor eccentricity, the three-dimensional electromagnetic forces and the subsequent mechanical responses are studied in this paper. The electromagnetic force, stress, and deformation on the end winding of the QFSN-600-2YHG turbo-generator are calculated by the finite element method (FEM) through an electromagnetic-structure coupling. The radial vibration characteristics of the winding are verified by experiments. It shows that the vibration wearing in the same layer is more serious than that between two neighboring layers. For different layers, the interphase coils endure a larger wearing risk than the innerphase coils. Inside the same phase, the last coil along the rotating direction has the highest risk of insulation wearing. The occurrence of static rotor eccentricity will significantly increase the electromagnetic forces and the vibration amplitudes on some coils. The end-phase coil which is close to the minimum air-gap point is the most dangerous one due to the lasting overstresses and the intensified deformations.

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静转子偏心对端部绕组力和振动磨损的影响

为了研究静转子偏心前后定子端部绕组的振动磨损规律和强度失效点，本文研究了静转子偏心前后定子端部绕组的三维电磁力及随后的力学响应。通过电磁-结构耦合，采用有限元法计算了QFSN-600-2YHG汽轮发电机端面绕组的电磁力、应力和变形。通过实验验证了绕组的径向振动特性。结果表明，同一层内的振动磨损比相邻两层之间的振动磨损更严重。对于不同的层，间相线圈比内相线圈承受更大的磨损风险。在同一相位内，沿旋转方向的最后一个线圈绝缘磨损的风险最高。静转子偏心的出现会使某些线圈上的电磁力和振动幅值显著增大。靠近最小气隙点的端相线圈由于持续的超应力和加剧的变形是最危险的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Rotating Machinery ENGINEERING, MECHANICAL-

CiteScore

2.40

自引率

0.00%

发文量

审稿时长

25 weeks

期刊介绍： This comprehensive journal provides the latest information on rotating machines and machine elements. This technology has become essential to many industrial processes, including gas-, steam-, water-, or wind-driven turbines at power generation systems, and in food processing, automobile and airplane engines, heating, refrigeration, air conditioning, and chemical or petroleum refining. In spite of the importance of rotating machinery and the huge financial resources involved in the industry, only a few publications distribute research and development information on the prime movers. This journal is the first source to combine the technology, as it applies to all of these specialties, previously scattered throughout literature.