Advanced Investigation of Rheo-Tribological and Electrical Properties of Greases Used in Electric Vehicles
Lubricants for electric vehicles must meet added requirements due to stray currents from motor control systems which can damage bearings. Rheological and tribological tests with different greases and simultaneous impedance measurements help model grease behavior under dynamic conditions.
As electromobility gains importance, it is essential to address the distinctive needs of lubricants for this purpose. Model-scale testing of tribological systems, including engine parts and lubrication components like oils and greases, is well established. These tests are both time- and cost-effective, and when paired with an appropriate model, they offer good potential for applying the results to real-world systems. This study primarily aims to introduce specific laboratory-scale test methods for characterizing lubricating greases with respect to their electrical properties, distinguishing them based on frictional behavior and the electro-tribological response of the system. The focus lies particularly on developing conductive greases designed to prevent long-term damage to ball bearings caused by stray currents originating from frequency converters.
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