실제 운전조건을 고려한 전기자동차 베어링의 전기적 손상 평가
Evaluation of Electrical Damage to Electric-vehicle Bearings under Actual Operating Conditions
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Due to global CO2 emission reductions and fuel efficiency regulations, the trend toward transitioning from internal combustion engine vehicles to electric vehicles (EVs) has accelerated. Consequently, the problem of EV failures has become a focal point of active research. The parasitic capacitance generated during motorshaft rotation induces voltage that deteriorates the raceway and ball surfaces of bearings, causing electrical damage in EVs. Despite numerous attempts to address this issue, most studies have been conducted under high viscosity lubricant and low load conditions. However, due to factors such as high-speed operation, rapid acceleration and deceleration, motor heating, and motor system–decelerator integration, current EV applications have shown diminished stability in lubrication films of motor bearings, thereby leveraging the investigation to address the risk of electrical damage. This study investigates the electrical damage to rolling bearing elements in EV motor drive systems. The experimental analysis focuses on the effects of electric currents and operational loads on bearing integrity. A test rig is designed to generate high-rate voltage specific to a motor system's parasitic capacitance, and bearing samples are exposed to these currents for specified durations. Component evaluation involves visual inspections and vibration measurements. In addition, a predictive model for electrical failure is developed based on accumulated data, which demonstrates the ability to predict the likelihood of electrical failure relative to the duration and intensity of current exposure. This in turn reduces uncertainties in practical applications regarding electrical erosion modes.
Abstract
Due to global CO2 emission reductions and fuel efficiency regulations, the trend toward transitioning from internal combustion engine vehicles to electric vehicles (EVs) has accelerated. Consequently, the problem of EV failures has become a focal point of active research. The parasitic capacitance generated during motorshaft rotation induces voltage that deteriorates the raceway and ball surfaces of bearings, causing electrical damage in EVs. Despite numerous attempts to address this issue, most studies have been conducted under high viscosity lubricant and low load conditions. However, due to factors such as high-speed operation, rapid acceleration and deceleration, motor heating, and motor system–decelerator integration, current EV applications have shown diminished stability in lubrication films of motor bearings, thereby leveraging the investigation to address the risk of electrical damage. This study investigates the electrical damage to rolling bearing elements in EV motor drive systems. The experimental analysis focuses on the effects of electric currents and operational loads on bearing integrity. A test rig is designed to generate high-rate voltage specific to a motor system's parasitic capacitance, and bearing samples are exposed to these currents for specified durations. Component evaluation involves visual inspections and vibration measurements. In addition, a predictive model for electrical failure is developed based on accumulated data, which demonstrates the ability to predict the likelihood of electrical failure relative to the duration and intensity of current exposure. This in turn reduces uncertainties in practical applications regarding electrical erosion modes.
참고문헌 (22)
- Singh, G. K., "Induction machine drive condition monitoring and diagnostic research—A survey", Electr. Power Syst. Res., 64(2), pp.145~158 (2003)[DOI]
- Boškoski, P., "Detection of lubrication starved bearings in electrical motors by means of vibration analysis", Tribol. Int., 43(9), pp.1683~1692 (2010)[DOI]
- He, F., "Electrical bearing failures in electric vehicles", Friction, 8, pp.4~28 (2020)[DOI]
- Kim, M. H., "A Study on Electric Erosion of Bearings for EV", Proc. 66th Autumn Conf. Korean Tribol. Soc (2018)
- Magdun, O., "High-frequency induction machine modeling for common mode current and bearing voltage calculation", IEEE Trans. Ind. Appl., 50(3), pp.1780~1790 (2013)[DOI]
- Zika, T., "Surface analysis on rolling bearings after exposure to defined electric stress", Proc. Inst. Mech. Eng. J: J. Eng. Tribol, 223(5), pp.787~797 (2009)[DOI]
- Adabi, J., "Bearing damage analysis by calculation of capacitive coupling between inner and outer races of a ball bearing", 2008 13th International Power Electronics and Motion Control Conference (2008)
- Prashad, H., "Diagnosis of rolling-element bearings failure by localized electrical current between track surfaces of races and rolling-elements", J. Trib., 124(3), pp.468~473 (2002)[DOI]
- "Comparison of analytic and numeric methods to calculate ball bearing capacitance" (2021)[URL]
- Gemeinder, Y., "Calculation and validation of a bearing impedance model for ball bearings and the influence on EDM-currents", ICEMS, pp.1804~1810 (2014)
- Chevallier, E., "Voltage noise across a metal", metal sliding contact as a probe of the surface state, 2014, pp.115(15), 154903~
- Busse, D., "System electrical parameters and their effects on bearing currents", IEEE Trans. Ind, 33(2), pp.577~584 (1997)[DOI]
- Muetze, A., "Influence of motor operating parameters on discharge bearing current activity", IEEE Trans. Ind. Appl., 47(4), pp.1767~1777 (2011)[DOI]
- Cen, H., "Film thickness in a grease lubricated ball bearing", Tribol. Int., 134, pp.26~35 (2019)[DOI]
- Magdun, O., "Calculation of Roller and Ball Bearing Capacitances and Prediction of EDM Currents", IECON 2009, pp.1051~1056 (2009)
- Hamrock, J., "Isothermal elastohydrodynamic lubrication of point contacts: part III-fully flooded results", J. Tribol., 99(2), pp.264~275 (1977)[DOI]
- Bader, N., "Capacitances and lubricant film thicknesses of grease and oil lubricated bearings", STLE Annual Meeting & Exhibition (2017)
- Hamrock, B. J., "In Fundamentals of Fluid Film Lubrication", pp.2~9 (2004), McGraw-Hill
- Muetze, A., "Experimental Evaluation of the Endangerment of Ball Bearings due to Inverter-Induced Bearing Currents", 39thIAS Annual Meeting, pp.1989~1995 (2004)
- "Statsmodels homepage"[URL]
- Cho, J. C., "Study on the Film Thickness and Pressure of the Transient Line Contact Elastohydrodynamic Lubrication", Tribol. Lubr, 25(5), pp.335~341 (2009)[DOI]
- Park, T. J., "Elastohydrodynamic Film Thickness in Elliptical Contacts with Rolling and Spinning", Tribol. Lubr, 24(6), pp.355~361 (2008)[DOI]