Research on Analysis and Suppression Methods of the Bearing Current for Electric Vehicle Motor Driven by SiC Inverter

Mingliang Yang, Yuan Cheng (), Bochao Du, Yukuan Li, Sibo Wang and Shumei Cui
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Mingliang Yang: School of Electrical Engineering and Automation, Harbin Institute of Technology (HIT), Harbin 150001, China
Yuan Cheng: School of Electrical Engineering and Automation, Harbin Institute of Technology (HIT), Harbin 150001, China
Bochao Du: School of Electrical Engineering and Automation, Harbin Institute of Technology (HIT), Harbin 150001, China
Yukuan Li: China FAW Group Co., Ltd., Changchun 130013, China
Sibo Wang: China FAW Group Co., Ltd., Changchun 130013, China
Shumei Cui: School of Electrical Engineering and Automation, Harbin Institute of Technology (HIT), Harbin 150001, China

Energies, 2024, vol. 17, issue 5, 1-18

Abstract: The silicon carbide (SiC) inverter brings great advantages to the motor drive systems of new energy vehicles; however, severe challenges to the bearings also happen. The high dc bus voltage and switching frequency of SiC inverter can increase the discharge frequency and energy when the bearing grease film collapses. As a result, the bearing suffers severe electric corrosion, and the service life of the motor drive system can be shortened. In this paper, the characteristics of common-mode voltage and bearing voltage are analyzed, firstly under space vector pulse width modulation (SVPWM). After that, the common-mode equivalent circuit model of the motor drive system is established. The frequency characteristics of bearing voltage are revealed, and the safe working area is determined. Then, the frequency characteristics of bearing voltage and current are verified based on IGBT and SiC inverters in experiments. After that, by designing a common-mode filter, the bearing voltage and current are significantly attenuated. Furthermore, the active zero state PWM (AZSPWM) is adopted to reduce the common-mode voltage from the inverter. At the same time, combined with the common-mode filter, the bearing voltage and current are further reduced. The experimental results show that the switching frequency has a decisive effect on the amplitude of bearing voltage and current. The bearing voltage can be attenuated to around half of the reference bearing voltage by using the common-mode filter and AZSPWM strategy, respectively. The combination of the common-mode filter and AZSPWM strategy can reduce the bearing voltage to around one-fourth of the reference bearing voltage, which can effectively reduce the breakdown time and discharge energy of the grease oil film.

Keywords: SiC inverter; bearing current; common-mode filter; AZSPWM (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: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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