Influence of Parasitic Electric Currents on an Exemplary Mineral-Oil-Based Lubricant and the Raceway Surfaces of Thrust Bearings

Graf, Simon; Koch, Oliver; Sauer, Bernd

doi:10.3390/lubricants11080313

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…The bearing was assessed after the test period, i.e., after the two-step tests, Figure 5, and the long-term damage at Vlongtime = 16 V for a total of 250 min, which is longer than the measurement period of 3 h due to the saving periods during which voltage was also applied to the bearing. During this time, characteristic damage patterns on the bearing could be identified: The inner ring showed fluting in the raceway, while the raceway of the outer ring in the load zone showed a dull surface, so-called gray frosting [12], cf. Figure 7.…”

Section: Exemplary Measurement Results At a Single Test Pointmentioning

confidence: 99%

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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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Section: Exemplary Measurement Results At a Single Test Pointmentioning

confidence: 99%

“…Different types of bearing currents are distinguished [12][13][14]. In this work, the focus is on the so-called rotor-to-earth currents, which occur due to potential differences between the rotor and earth potential.…”

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

View full text Add to dashboard Cite

show abstract

“…Graf et al [40] investigate the influence of parasitic currents using a thrust bearing lubricated with mineral oil. In particular, the influence of an additional electrical load and the lubricant, which is chemically analyzed to detect changes in the lubricant, are investigated.…”

mentioning

confidence: 99%