Experimental comparison of motor bearing currents with PWM hard- and soft-switched voltage-source inverters

Bhattacharya, Subhashish; Resta, L.; Divan, D.M.; Novotny, D.W.; Lipo, T.Α.

doi:10.1109/63.761699

Cited by 49 publications

(7 citation statements)

References 16 publications

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“…This is in accordance with the above-noted theory that EDM-currents are not related to the stator ground current [11]. For example, the stator ground current is only 50% in configuration E3 when compared to E1.…”

Section: Influence Of Grounding Configurationsupporting

confidence: 90%

“…However, the EDM-currents in configuration E1 and E3 are nearly the same. Again, in accordance with the above-noted theory [10,11], the picture is different for the circular bearing currents of the 110 kW power level. A reduction of the stator ground currents in configuration E2, when compared with configuration E1, also yields a reduction of bearing currents by 50%.…”

Section: Influence Of Grounding Configurationsupporting

confidence: 86%

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Systematic approach to bearing current evaluation in variable speed drive systems

Muetze

Binder

2005

Int Trans Elec Energy Syst

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Section: Influence Of Grounding Configurationsupporting

confidence: 90%

Section: Influence Of Grounding Configurationsupporting

confidence: 86%

Systematic approach to bearing current evaluation in variable speed drive systems

Muetze

Binder

2005

Int Trans Elec Energy Syst

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“…This accumulated rotor charge eventually discharges through the bearings if no other galvanic current path is provided. Over time, these discharges can cause serious pitting of the bearing balls and races that eventually leads to bearing failures under some circumstances that have been experienced in field installa- tions [20]- [25]. The introduction of insulated bearings or grounded rotor shaft brushes are among the solutions adopted by machine manufacturers to prevent these bearing failures.…”

Section: ) Inverter Stagementioning

confidence: 99%

Recent advances in power electronics technology for industrial and traction machine drives

2001

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This paper presents a review of the state of the art of power electronics technology in both industrial and traction drive application. Key development trends include the dominance of ac adjustable-speed drives in new applications, with the squirrel-cage induction machine as the preferred machine in most cases. Particularly striking has been the rapid ascendance of the insulated-gate bipolar transistor (IGBT) as the predominant power switch in both industrial and traction applications ranging from fractional kilowatts to multimegawatts. Key current issues such as industrial drive input power quality and the effects of fast IGBT switching transients on the machines and electromagnetic interference (EMI) production are reviewed. Recent developments in electric traction for both rail and road vehicles are discussed, including the increasing modularity of new traction inverters in all sizes and the market introduction of new hybrid vehicles using advanced power electronics.The paper concludes with a discussion of expected future trends in power electronics technology that will likely expand the markets for industrial and traction drives during coming years.

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“…It is termed "non-circulating" because these currents pass through the bearings unidirectionally from the rotor to the stator [60]. The dv/dt related currents can be conductive and capacitive [62]. The conductive currents mainly occur when the motor is running at a low speed.…”

Section: "Non-circulating" Currentsmentioning

confidence: 99%

Electrical bearing failures in electric vehicles

2020

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In modern electric equipment, especially electric vehicles, inverter control systems can lead to complex shaft voltages and bearing currents. Within an electric motor, many parts have electrical failure problems, and among which bearings are the most sensitive and vulnerable components. In recent years, electrical failures in bearing have been frequently reported in electric vehicles, and the electrical failure of bearings has become a key issue that restricts the lifetime of all-electric motor-based power systems in a broader sense. The purpose of this review is to provide a comprehensive overview of the bearing premature failure in the mechanical systems exposed in an electrical environment represented by electric vehicles. The electrical environments in which bearing works including the different components and the origins of the shaft voltages and bearing currents, as well as the typical modes of electrical bearing failure including various topographical damages and lubrication failures, have been discussed. The fundamental influence mechanisms of voltage/current on the friction/ lubrication properties have been summarized and analyzed, and corresponding countermeasures have been proposed. Finally, a brief introduction to the key technical flaws in the current researches will be made and the future outlook of frontier directions will be discussed.

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Experimental comparison of motor bearing currents with PWM hard- and soft-switched voltage-source inverters

Cited by 49 publications

References 16 publications

Systematic approach to bearing current evaluation in variable speed drive systems

Systematic approach to bearing current evaluation in variable speed drive systems

Recent advances in power electronics technology for industrial and traction machine drives

Electrical bearing failures in electric vehicles

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