Prediction of motor bearing currents for converter operation

Kriese, M. D.; Wittek, E.; Gattermann, S.; Tischmacher, H.; Poll, Gerhard; Ponick, Bernd

doi:10.1109/icelmach.2010.5608127

Cited by 29 publications

(27 citation statements)

References 1 publication

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“…This result correlates well with the results of [8], where also an increased number of EDM currents was detected above the limit of 30 kV/mm. …”

Section: A Resultssupporting

confidence: 94%

“…The increase of bearing current events in the critical range above a maximum bearing voltage of approximately 35 V correlates well with the field strength approach in [8]. Under these test conditions, the limit value of 30 KV/mm for significant increase of EDM currents was reached at a maximum bearing voltage of 35 V.…”

Section: Condition Monitoringsupporting

confidence: 53%

“…The ratio between the voltage drop and the lubricant film thickness leads to the electric field strength in the gap. For values above 30 kV/mm the probability of EDM currents increases significantly [8]. To verify this, various test runs have been done with detailed investigations of the bearing currents using the bearing current sensor.…”

Section: A Resultsmentioning

confidence: 97%

“…Electrical field strengths and energy levels in the lubricant gap. • Model generation and simulation [8], [13] Modelling the various relationships in the motor in simulation models and embedding these in the overall system comprising the plant -convertermotor and load. • Condition monitoring [6], [7], [12] Superior measuring system, which permits condition monitoring of the electrical and mechanical bearing load.…”

Section: Nomenclaturementioning

confidence: 99%

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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 result correlates well with the results of [8], where also an increased number of EDM currents was detected above the limit of 30 kV/mm. …”

Section: A Resultssupporting

confidence: 94%

Section: Condition Monitoringsupporting

confidence: 53%

Section: A Resultsmentioning

confidence: 97%

Section: Nomenclaturementioning

confidence: 99%

See 2 more Smart Citations

Investigations on bearing currents in converter-fed electrical motors

Tischmacher

Gattermann

2012

2012 XXth International Conference on Electrical Machines

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“…In more recent years, further studies on the thickness of the lubrication film of the bearing, computation of the bearing capacitances, and computation of parameters of the equivalent circuits have been presented, further expanding the existing models, e.g. (Kempski, Smolenski, Bojarski, 2005;Kovanen, Sö derlund, Kettunen, 2008;Adabi et al, 2010;Kriese et al, 2010;Wittek et al, 2010;.…”

Section: Bearing Currentsmentioning

confidence: 99%

Thousands of hits: on inverter-induced bearing currents, related work, and the literature

Mütze

2011

Elektrotech. Inftech.

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A. Mü tze OVE Today, a search for bearing currents in databases on engineering literature may return hundreds or (depending on the database and any additional filter used) thousands of hits. The degree to which the identified papers address the bearing current topic itself varies. Often, the term is used (as it is common with key words) to reflect the wider context and the topicality of the work that is presented, e.g. a discussion of a new filter topology. Without claiming completeness, this paper provides an overview of the various aspects that have been addressed in literature related to the bearing current topic.Tausende von Treffern: Ü ber umrichterbedingte Lagerströ me, zugehö rige Themen und die Literatur.Eine einfache Suche unter dem Stichwort "Lagerströ me in einer Datenbank fü r Ingenieursliteratur kann zu hunderten oder (abhä ngig von der Datenbank und zusä tzlich verwendeten Filtern) tausenden von Treffern fü hren. Das Ausmaß, mit dem die identifizierten Publikationen das Lagerstromthema behandeln, variiert. Oft wird der Begriff (wie es fü r Stichwö rter ü blich ist) verwendet, um den weiteren Zusammenhang und die Aktualitä t des in der jeweiligen Publikation behandelten Themas, wie z. B. eine neue Filtertopologie, widerzuspiegeln. Dieser Beitrag gibt einen Ü berblick ü ber die verschiedenen mit dem Lagerstromthema in Verbindung stehenden Aspekte, die in der Literatur behandelt werde.

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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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Prediction of motor bearing currents for converter operation

Cited by 29 publications

References 1 publication

Investigations on bearing currents in converter-fed electrical motors

Investigations on bearing currents in converter-fed electrical motors

Thousands of hits: on inverter-induced bearing currents, related work, and the literature

Electrical bearing failures in electric vehicles

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