Electrical compatibility of transmission fluids in electric vehicles

The in electrical vehicles, where the electric motor is inside the transmissielectrical compatibility of the automatic transmission fluids (ATFs) is very important on and in contact with the ATF. This work studies the influence of factors like temperature, time, and air exposition on the oxidation of three ATFs and their changes in electrical conductivity. The results showed that the higher content of additive the lower variations of electrical conductivity with the oxidation; the measurements of electrical conductivity are better than FT-IR ones for monitoring oil thermo-oxidative degradation at initial periods; the conventional ATFs could maintain good electrical compatibility in electrified drivelines, although their materials compatibility and copper corrosion protection of electrical components should be also tested.

Automated summary

This study focuses on the electrical compatibility of three automatic transmission fluids (ATFs) in electrified drivelines and their changes in electrical conductivity during oxidation. The results indicate that the higher content of additive leads to lower variations in electrical conductivity, and electrical conductivity measurements are more suitable for monitoring oil thermo-oxidative degradation at initial stages compared to FT-IR measurements. While conventional ATFs maintain good electrical compatibility in electrified drivelines, their materials compatibility and copper corrosion protection for electrical components should also be tested.