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

Xuejiao Ren, Ruifang Liu and Erle Yang
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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

Energies, 2019, vol. 12, issue 6, 1-9

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.

Keywords: bearing current; breakdown; equivalent resistance; bearing capacitance (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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