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Modelling of the Bearing Breakdown Resistance in Bearing Currents Problem of AC Motors

Author

Listed:
  • Xuejiao Ren

    (School of Electrical Engineering, Beijing Jiaotong University, Haidian Disctrict, Beijing 100044, China)

  • Ruifang Liu

    (School of Electrical Engineering, Beijing Jiaotong University, Haidian Disctrict, Beijing 100044, China)

  • Erle Yang

    (School of Electrical Engineering, Beijing Jiaotong University, Haidian Disctrict, Beijing 100044, China)

Abstract

With the wide application of pulse width modulation (PWM) technology in motor driving, the bearing current problem has become more and more severe. The most complicated problem in analyzing bearing currents is modeling the equivalent circuit of the bearing and determination of the equivalent parameters of the model. During the process of bearing current breakdown, the bearing undergoes a transition from the capacitor state to the resistor state. The previously used equivalent model, which only consists of a capacitor parallel with a constant resistor, cannot reveal the real breakdown process. In this paper, an improved equivalent bearing model is derived from the waveform analysis of the experiment. The variable breakdown resistance model of the bearing is put forward and the calculation method of the breakdown resistance is given. The circuit simulation results from the variable resistance bearing model were much closer to the results of the experiment than those from the constant resistance model.

Suggested Citation

  • Xuejiao Ren & Ruifang Liu & Erle Yang, 2019. "Modelling of the Bearing Breakdown Resistance in Bearing Currents Problem of AC Motors," Energies, MDPI, vol. 12(6), pages 1-9, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:6:p:1121-:d:216369
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    References listed on IDEAS

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    1. Ruifang Liu & Xin Ma & Xuejiao Ren & Junci Cao & Shuangxia Niu, 2018. "Comparative Analysis of Bearing Current in Wind Turbine Generators," Energies, MDPI, vol. 11(5), pages 1-13, May.
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    Cited by:

    1. Karolina Kudelina & Bilal Asad & Toomas Vaimann & Anton Rassõlkin & Ants Kallaste & Huynh Van Khang, 2021. "Methods of Condition Monitoring and Fault Detection for Electrical Machines," Energies, MDPI, vol. 14(22), pages 1-20, November.
    2. Lei Yang & Ying Yang & Junfu Wen & Lei Jia & Erle Yang & Ruifang Liu, 2022. "Suppression of Rotor-Grounding Bearing Currents Based on Matching Stator and Rotor Grounding Impedances," Energies, MDPI, vol. 15(5), pages 1-13, February.
    3. Manje Yea & Ki Jin Han, 2020. "Modified Slot Opening for Reducing Shaft-to-Frame Voltage of AC Motors," Energies, MDPI, vol. 13(3), pages 1-9, February.
    4. Wagner Fontes Godoy & Daniel Morinigo-Sotelo & Oscar Duque-Perez & Ivan Nunes da Silva & Alessandro Goedtel & Rodrigo Henrique Cunha Palácios, 2020. "Estimation of Bearing Fault Severity in Line-Connected and Inverter-Fed Three-Phase Induction Motors," Energies, MDPI, vol. 13(13), pages 1-17, July.

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