Research on Bearing Model of Bearing Current Analysis and Calculation of Equivalent Resistance

doi:10.11985/2019.02.001

Abstract

Abstract:

：With the wide application of pulse width modulation (PWM) technology in motor drive, the bearing current problem becomes more and more prominent. The bearing equivalent model is one of the most complicated problems in analyzing bearing currents. Usually a simple capacitor, resistor series or parallel circuit is used to model the bearing breakdown process, but it is not consistent with the experiment result. An improved equivalent bearing model is proposed, which is derived from the structure of the bearing and the waveform of the bearing breakdown. The equivalent breakdown resistance of the bearing is variable, which is determined through the arc breakdown theory. Comparing the simulation waveforms with the experiment waveforms, the proposed equivalent bearing model is more accurate than the previous constant resistant model.

Key words: Bearing current, bearing model, breakdown resistance, arc theory

CLC Number:

TM343

REN Xuejiao,LIU Ruifang,WANG Qinqin. Research on Bearing Model of Bearing Current Analysis and Calculation of Equivalent Resistance[J]. Journal of Electrical Engineering, 2019, 14(2): 1-6.

Figures/Tables 16

References 18

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i	0	1	2	3	4
C_o/pF	23.6	23.3	22.9	22.3	20.6
C_i/pF	10.9	10.0	9.4	7.7	5.6
C_b_i/pF	7.45	7.00	6.66	5.72	4.40