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Effect of Eccentricity Factors on End Winding Electromagnetic Force in Turbo-generator

Received: 28 October 2021     Accepted: 19 November 2021     Published: 27 November 2021
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Abstract

Static eccentricity will cause the abnormal distribution of air gap magnetic field and further affect the electromechanical characteristics of the generator. This paper comparatively studies on the end winding electromagnetic force of turbo generator under different eccentricity ratio and eccentricity angle. The analytical expression of end winding electromagnetic force is derived after eccentricity. Meanwhile, the three-dimensional transient finite element simulation is carried on under several eccentricity cases. Then the amplitude variation characteristics with eccentricity ratio and angle are analyzed. Further, the force characteristics are verified by experimental vibration acceleration of CS-5 simulating generator. It is found that the static eccentricity will not change the frequency components of the end winding force. However, it will change the amplitude of the electromagnetic force, and the increase or decrease tendency depends on the winding position, eccentricity ratio and eccentricity angle. The number of force amplitude increasing coils is close to half of the total number, and it changes slightly with the eccentricity ratio and eccentricity angle. The force increment of coil near the minimum air gap will be larger with the increase of eccentricity ratio, but it is not affected greatly by eccentricity angle. Moreover the coil with the most obvious force increase is located in the interphases position near the minimum air gap.

Published in International Journal of Electrical Components and Energy Conversion (Volume 7, Issue 2)

This article belongs to the Special Issue Electro-Mechanical Coupling Problems in Electric Machines

DOI 10.11648/j.ijecec.20210702.13
Page(s) 48-53
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2021. Published by Science Publishing Group

Keywords

Electromagnetic Force, Eccentricity Factors, End Winding, Turbo-generator

References
[1] B. A. T. Iamamura, Y. Le Menach, A. Tounzi, N. Sadowski, et al. “Study of Static and Dynamic Eccentricities of a Synchronous Generator Using 3-D FEM,” Transactions on Magnetics, vol. 46, no. 8, pp. 3516−3519, 2010.
[2] Zhang, Guoyuan; Wei, Junchao; Huang, Haizhou; Zhou, Miao. “A study on the nonlinear vibration of the generator rotor based on the unbalanced electromagnetic force and the oil film force coupling model,” Journal of Vibroengineering, vol. 15, no. 1, pp. 23-36, 2013.
[3] C. Patsios, A. Chaniotis, E. Tsampouris and A. Kladas. “Particular Electromagnetic Field Computation for Permanent Magnet Generator Wind Turbine Analysis,” IEEE Transactions on Magnetics, vol. 46, no. 8, pp. 2751-2754, 2010.
[4] Y. He et al. “A New External Search Coil Based Method to Detect Detailed Static Air-Gap Eccentricity Position in Non-Salient Pole Synchronous Generators”, IEEE Transactions on Industrial Electronics, pp. PP (99): 1-1, 2020, doi: 10.1109/TIE.2020.3003635.
[5] Y. He et al. “Effect of 3D Unidirectional and Hybrid SAGE on Electromagnetic Torque Fluctuation Characteristics in Synchronous Generator,” IEEE Access, vol. 7, pp. 100813-100823, 2019.
[6] Y. He et al. “Rotor UMP characteristics and vibration properties in synchronous generator due to 3D static air-gap eccentricity faults,” IET Electric Power Applications, vol. 14, no. 6, pp. 961-971, 2020.
[7] Yan Xuechao. “Analysis of Magnetic Field and Calculation of Magnetic Force for Large Turbo-generator with Rotor Eccentricity,” Harbin University of Science and Technology, Harbin, China, 2013 (in Chinese).
[8] Zhang Wenzhan. “Analysis and application of electromagnetic force on turbo-generator rotor and stator”, North China Electric Power University, Hebei, Chian, 2010 (in Chinese).
[9] Liu Fei, Liang Lin, Xu Guanghua, Dong Jiacheng. “A Detection Method of Motor Rotational Eccentricity Using Current Information,” Transactions of China Electrotechnical Society, vol. 29, no. 7, pp. 181-186+208,. 2014 (in Chinese).
[10] H. Ehya, I. Sadeghi and J. Faiz. “Online condition monitoring of large synchronous generator under eccentricity fault,” 2017 12th IEEE Conference, 2017.
[11] J. A. Tegopoulos, “Forces on the End Winding of Turbine-Generators II - Determination of Forces” IEEE Transactions on Power Apparatus and Systems, 1966, 85 (2): 14-122.
[12] Hong-Chun Jiang, Gui-Ji Tang, Yu-Ling He et al., “Effect of Static Rotor Eccentricity on End Winding Forces and Vibration Wearing,” International Journal of Rotating Machinery, vol. 2021, pp. 1-14, 2021.
[13] Yu-Ling He, Wei-Qi Deng, Bo Peng, etc. “Stator Vibration Characteristic Identification of Turbogenerator among Single and Composite Faults Composed of Static Air-Gap Eccentricity and Rotor Interturn Short Circuit” Shock and Vibration, vol. 2016, pp. 1-14, 2016.
[14] H.-C. Jiang, Y.-L. He, G.-J. Tang, and M.-X. Xu, “A comprehensive analysis on transient electromagnetic force behavior of stator windings in turbo-generator,” Mathematical Problems in Engineering, vol. 2018, pp. 1-16, 2018.
Cite This Article
  • APA Style

    Hong Chun Jiang, Yu Ling He, Gui Ji Tang. (2021). Effect of Eccentricity Factors on End Winding Electromagnetic Force in Turbo-generator. International Journal of Electrical Components and Energy Conversion, 7(2), 48-53. https://doi.org/10.11648/j.ijecec.20210702.13

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    ACS Style

    Hong Chun Jiang; Yu Ling He; Gui Ji Tang. Effect of Eccentricity Factors on End Winding Electromagnetic Force in Turbo-generator. Int. J. Electr. Compon. Energy Convers. 2021, 7(2), 48-53. doi: 10.11648/j.ijecec.20210702.13

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    AMA Style

    Hong Chun Jiang, Yu Ling He, Gui Ji Tang. Effect of Eccentricity Factors on End Winding Electromagnetic Force in Turbo-generator. Int J Electr Compon Energy Convers. 2021;7(2):48-53. doi: 10.11648/j.ijecec.20210702.13

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  • @article{10.11648/j.ijecec.20210702.13,
      author = {Hong Chun Jiang and Yu Ling He and Gui Ji Tang},
      title = {Effect of Eccentricity Factors on End Winding Electromagnetic Force in Turbo-generator},
      journal = {International Journal of Electrical Components and Energy Conversion},
      volume = {7},
      number = {2},
      pages = {48-53},
      doi = {10.11648/j.ijecec.20210702.13},
      url = {https://doi.org/10.11648/j.ijecec.20210702.13},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijecec.20210702.13},
      abstract = {Static eccentricity will cause the abnormal distribution of air gap magnetic field and further affect the electromechanical characteristics of the generator. This paper comparatively studies on the end winding electromagnetic force of turbo generator under different eccentricity ratio and eccentricity angle. The analytical expression of end winding electromagnetic force is derived after eccentricity. Meanwhile, the three-dimensional transient finite element simulation is carried on under several eccentricity cases. Then the amplitude variation characteristics with eccentricity ratio and angle are analyzed. Further, the force characteristics are verified by experimental vibration acceleration of CS-5 simulating generator. It is found that the static eccentricity will not change the frequency components of the end winding force. However, it will change the amplitude of the electromagnetic force, and the increase or decrease tendency depends on the winding position, eccentricity ratio and eccentricity angle. The number of force amplitude increasing coils is close to half of the total number, and it changes slightly with the eccentricity ratio and eccentricity angle. The force increment of coil near the minimum air gap will be larger with the increase of eccentricity ratio, but it is not affected greatly by eccentricity angle. Moreover the coil with the most obvious force increase is located in the interphases position near the minimum air gap.},
     year = {2021}
    }
    

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  • TY  - JOUR
    T1  - Effect of Eccentricity Factors on End Winding Electromagnetic Force in Turbo-generator
    AU  - Hong Chun Jiang
    AU  - Yu Ling He
    AU  - Gui Ji Tang
    Y1  - 2021/11/27
    PY  - 2021
    N1  - https://doi.org/10.11648/j.ijecec.20210702.13
    DO  - 10.11648/j.ijecec.20210702.13
    T2  - International Journal of Electrical Components and Energy Conversion
    JF  - International Journal of Electrical Components and Energy Conversion
    JO  - International Journal of Electrical Components and Energy Conversion
    SP  - 48
    EP  - 53
    PB  - Science Publishing Group
    SN  - 2469-8059
    UR  - https://doi.org/10.11648/j.ijecec.20210702.13
    AB  - Static eccentricity will cause the abnormal distribution of air gap magnetic field and further affect the electromechanical characteristics of the generator. This paper comparatively studies on the end winding electromagnetic force of turbo generator under different eccentricity ratio and eccentricity angle. The analytical expression of end winding electromagnetic force is derived after eccentricity. Meanwhile, the three-dimensional transient finite element simulation is carried on under several eccentricity cases. Then the amplitude variation characteristics with eccentricity ratio and angle are analyzed. Further, the force characteristics are verified by experimental vibration acceleration of CS-5 simulating generator. It is found that the static eccentricity will not change the frequency components of the end winding force. However, it will change the amplitude of the electromagnetic force, and the increase or decrease tendency depends on the winding position, eccentricity ratio and eccentricity angle. The number of force amplitude increasing coils is close to half of the total number, and it changes slightly with the eccentricity ratio and eccentricity angle. The force increment of coil near the minimum air gap will be larger with the increase of eccentricity ratio, but it is not affected greatly by eccentricity angle. Moreover the coil with the most obvious force increase is located in the interphases position near the minimum air gap.
    VL  - 7
    IS  - 2
    ER  - 

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Author Information
  • Hebei Key Laboratory of Electric Machinery and Failure Prevention, North China Electric Power University, Baoding, China

  • Hebei Key Laboratory of Electric Machinery and Failure Prevention, North China Electric Power University, Baoding, China

  • Hebei Key Laboratory of Electric Machinery and Failure Prevention, North China Electric Power University, Baoding, China

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