Investigation of influence of bearing load and bearing temperature on EDM bearing currents

Magdun, Oliver; Gemeinder, Yves; Binder, A.

doi:10.1109/ecce.2010.5618061

Cited by 52 publications

(26 citation statements)

References 14 publications

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“…Thus, the electrical breakdowns are likely to occur, giving rise to the generation of the EDM currents. With the nature of short-circuit current, the amplitude of the EDM currents in a 1.5 kW induction motor can range from 0.2 to 1.4 A [69]. The path of the EDM currents is "shaft-inner race of the bearing-rollers-outer ringframe" [70].…”

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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Section: "Non-circulating" Currentsmentioning

confidence: 99%

Electrical bearing failures in electric vehicles

2020

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“…Additional work with a detailed focus on the subject of generating models and prediction [11] as well as bearing dynamics [12] can be reviewed in associated publications. Other investigations with the focus on the operational parameters are outlined in [10], [11].…”

Section: Nomenclaturementioning

confidence: 99%

Investigations on bearing currents in converter-fed electrical motors

Tischmacher

Gattermann

2012

2012 XXth International Conference on Electrical Machines

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As shown in [6], the issue of current flowing through a motor bearing is a system-related topic. Different aspects have to be taken into account to identify countermeasures to avoid or dampen the current flow. Up until now, it is not possible to define clear limits where the changes in the bearing raceways lead to the so called corrugation and with this to a possible bearing failure. This paper shows the latest results that were obtained with the investigation schematic presented in [6]. New results in the area of field experience with the so called "Bearing Current Sensor" (BCS) will be discussed. Additional results in the area of parameter tests, which take into account the dependency of temperature, speed, voltage as well as the type of lubricant grease, are shown.

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“…This value is mainly based on experience and lacks a complete scientific understanding. Recently, experimental results attributing the occurrence of fluting (considered as putting the bearing at risk) as opposed to a grey race to reduced load have been presented (Tischmacher and Gattermann, 2010) (radial force), (Magdun et al, 2010) (axial force). It has also been shown that the bearing ages proportionally with the product of apparent current density, switching frequency, and time of operation (Muetze et al, 2006).…”

Section: Modelling Challengementioning

confidence: 99%

Modelling of impulse currents in mechanical rolling element bearings

Kolbe

Muetze

Hameyer

2012

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this paper is to contribute toward the modelling of the microscopic interaction between high-frequency discharge bearing currents and rolling element bearings in the contact zone. It also aims to develop a reduced model that can serve as a starting point for further developments. Design/methodology/approach -The complexity of an ideal comprehensive model is identified and analysed. Based thereon, a reduced model is developed. Findings -The true system is highly complex and cannot be solved in a single-step approach. The proposed reduced model allows the explanation of the melting of the bearing surfaces under the influence of the high-frequency currents. It also provides a starting point for the development of an extended model. Research limitations/implications -The model excludes the dynamic rolling movement of the bearing. The development of the frosting and fluting observed on the bearing running surfaces can only be explained in parts. Practical implications -The melting of the bearing race surface can be modelled and thereby explained. The proposed model forms a good basis for further work toward an extended model to explain the high-frequency bearing current bearing damage mechanism. Originality/value -The paper offers a method to model the microscopic interaction between high-frequency discharge bearing currents and rolling element bearings in the contact zone. This phenomenon has not yet been modelled to this extent. Such a model -and the understanding brought forth from it -allows the reduction in the cost for safe operation of modern variable speed drive systems.

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Investigation of influence of bearing load and bearing temperature on EDM bearing currents

Cited by 52 publications

References 14 publications

Electrical bearing failures in electric vehicles

Electrical bearing failures in electric vehicles

Investigations on bearing currents in converter-fed electrical motors

Modelling of impulse currents in mechanical rolling element bearings

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