Electrical Discharge Damage in EV Bearings | Dr. Jonny Hansen | Tribology Webinar

Electrification has introduced new tribological challenges for electric vehicles (EVs), particularly in bearings where electrical discharge damage (EDD) can occur—even in the full-film lubrication regime.

In this TriboNet webinar, Dr. Jonny Hansen, tribology expert at Scania’s Electric Propulsion Development Department, explains why classical tribology models like the Stribeck curve and the lambda (λ) parameter are no longer sufficient for EV drivetrains. He introduces the improved Lambda star (λ) parameter*, details the mechanisms of electrical discharge currents, and discusses effective mitigation strategies such as grounding rings, hybrid bearings, and inverter modifications.

Key Topics Covered:

Fundamentals of classical tribology and elastohydrodynamic lubrication (EHL)

Why EVs face unique bearing damage risks

Electrical discharge damage (EDD) vs. electrical discharge machining (EDM)

The role of inverters in generating damaging bearing currents

Lambda star (λ*): a new predictive film parameter

Mitigation strategies for EV and heavy-duty applications

Future research opportunities in e-tribology

🔗 Explore more on TriboNet.org:

Introduction to Tribology

Elastohydrodynamic Lubrication (EHL)

Bearing Failures and Mechanisms

Lubricants and Additives in EV Applications

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Hashtags

#Tribology #ElectricVehicles #EVBearings #EDDamage #LambdaStar #ETribology #TriboNet

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Dr. Jonny Hansen Scania tribology