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Suppression of Rotor-Grounding Bearing Currents Based on Matching Stator and Rotor Grounding Impedances

Author

Listed:
  • Lei Yang

    (Bearing Project Department, CRRC Dalian Institute Co., Ltd., Dalian 116021, China)

  • Ying Yang

    (Bearing Project Department, CRRC Dalian Institute Co., Ltd., Dalian 116021, China)

  • Junfu Wen

    (Bearing Project Department, CRRC Dalian Institute Co., Ltd., Dalian 116021, China)

  • Lei Jia

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

  • Erle Yang

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

  • Ruifang Liu

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

Abstract

Pulse-width modulation (PWM) inverter drive systems are widely applied in industry for their great speed-control characteristics and performance. However, the common-mode voltage of the inverter induces motor bearing voltage and bearing current, which result in premature bearing failure. In this paper, the influence of stator and rotor grounding impedances on the bearing voltage of the motor is investigated. A comprehensive bearing-current equivalent model circuit is proposed. Based on circuit analysis, the relationship between bearing voltage ratio (BVR) and grounding impedances is derived, showing that bearing voltage varies with the stator grounding impedance on a V-shaped surface. The minimum BVR appears at some specific combinations of the stator and rotor grounding impedance. Based on this, a method of suppression of rotor-grounding bearing currents based on matching the stator and rotor grounding impedances is proposed. The analytical results are verified by experimental results and show that the bearing voltage can be mitigated by matching the grounding impedances in a proper range.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1638-:d:756048
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    References listed on IDEAS

    as
    1. 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.
    2. Sebastian Berhausen & Tomasz Jarek, 2021. "Method of Limiting Shaft Voltages in AC Electric Machines," Energies, MDPI, vol. 14(11), pages 1-19, June.
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    Cited by:

    1. Sebastian Berhausen & Tomasz Jarek, 2022. "Analysis of Impact of Design Solutions of an Electric Machine with Permanent Magnets for Bearing Voltages with Inverter Power Supply," Energies, MDPI, vol. 15(12), pages 1-19, June.

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