Investigation of the Static Breakdown Voltage of the Lubricating Film in a Mechanical Ball Bearing

Joshi, Abhishek; Blennow, Jörgen

doi:10.5324/nordis.v0i23.2464

Cited by 4 publications

(3 citation statements)

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“…When the bearing voltage exceeds the isolating capacity of the lubricating film, an electric discharge occurs in the form of an arc between the rings and the rolling elements. The aforementioned isolating capacity of the lubricating film depends on the lubricating film thickness and the breakdown field strength of the lubricant [20,21]. This shows that the lubricant used in the bearing thus has a crucial influence on the occurrence of EDM currents.…”

Section: Electric Discharge Machining (Edm) Breakdowns and Edm Currentsmentioning

confidence: 99%

The Influence of Lubricant Conductivity on Bearing Currents in the Case of Rolling Bearing Greases

et al. 2019

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In the course of increasing electric mobility, the effect of electricity on parts of machines is more significant than before. Rolling bearings and their lubrication, as a part of electric motors, are subjected to harmful currents, which lead to damage in the bearing in the long term. In order to avoid such damage, the influence of the lubricant in the bearing is becoming increasingly important. The electrical behaviour of the system can be investigated by analysing the discharge currents and the breakdown voltage in rolling bearings with lubricants of different compositions. This paper presents a procedure for characterizing the breakdown voltage at the rolling bearing and the influence of conductivity of the lubricants on harmful electrical phenomena.

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Section: Electric Discharge Machining (Edm) Breakdowns and Edm Currentsmentioning

confidence: 99%

The Influence of Lubricant Conductivity on Bearing Currents in the Case of Rolling Bearing Greases

et al. 2019

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“…The investigations by Harder [17] and Joshi [18] show that rolling bearings have a higher susceptibility to current passage after the first electrical breakdown (initial breakdown). On the one hand, this may be due to the roughened surface caused by the initial damage, because the resulting roughness peaks mean that a homogeneous electric field can no longer be assumed between the contact partners, and breakdowns occur more quickly due to the field elevation there [17].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Load and Speed on the Initial Breakdown of Rolling Bearings Exposed to Electrical Currents

Puchtler,

Maier,

Kuhn

et al. 2023

Lubricants

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The reason for the failure of electric vehicle drives is increasingly current-induced damage to rolling bearings. Studies show that rolling bearings are more susceptible to current pass-through after the first occurrence of unwanted bearing currents. To investigate this effect, a test plan is introduced with variations in axial and radial loads, as well as rotational speeds. A new bearing is mechanically run-in for each test point and then subjected to a realistic voltage signal of gradually increasing amplitude. After the initial breakdown, the different voltage amplitudes are applied again to investigate the behavior after the initial breakdown. During the whole test, the maximum current, the duration and the dissipated energy of each breakdown are measured. The results provide insights into the processes after the initial breakdown and the stochastic nature of the breakdown behavior.

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“…An experimental study conducted by Joshi and Blennow [10] on the electrical properties of lubricants showed that the number and duration of current discharge events was dependant on the voltage, shaft speed and bearing load. Bechev et al [11] conducted an analysis of lubricant properties for use in electric motor bearings.…”

Section: Introductionmentioning

confidence: 99%

Electrical Field Strength in Rough Infinite Line Contact Elastohydrodynamic Conjunctions

2022

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Rolling element bearings are required to operate in a variety of use cases that determine voltage potentials will form between the rolling elements and races. When the electrical field strength causes the dielectric breakdown of the intermediary lubricant film electrical discharge can damage the bearing surfaces. To reduce the prevalence and severity of electrical discharge machining an improved understanding of the coupled electrical and mechanical behavior is necessary. This paper aims to improve understanding of the problem through a combined elastohydrodynamic and electrostatic numerical study of charged elastohydrodynamic conjunctions. The results show the effect of amplitude reduction means that for typical surface topographies found in EHL conjunctions the maximum field strength is adequately predicted by the elastohydrodynamic minimum film thickness and potential difference. The paper also indicates the width of the elevated electrical field strength region is dependent on EHL parameters which could have important implications on the magnitude of current density during dielectric breakdown.

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Investigation of the Static Breakdown Voltage of the Lubricating Film in a Mechanical Ball Bearing

Cited by 4 publications

References 0 publications

The Influence of Lubricant Conductivity on Bearing Currents in the Case of Rolling Bearing Greases

The Influence of Lubricant Conductivity on Bearing Currents in the Case of Rolling Bearing Greases

The Influence of Load and Speed on the Initial Breakdown of Rolling Bearings Exposed to Electrical Currents

Electrical Field Strength in Rough Infinite Line Contact Elastohydrodynamic Conjunctions

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