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

Lei Yang, Ying Yang, Junfu Wen, Lei Jia, Erle Yang and Ruifang Liu
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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

Energies, 2022, vol. 15, issue 5, 1-13

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.

Keywords: grounding impedance; bearing voltage ratio; rotor-grounding bearing current; Wheatstone bridge; bearing current (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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