Electric motor cooling simulation: direct vs indirect

Abstract

In a global energy transition program, electric and hybrid vehicles will sharply increase in order for the OEMs to meet CO2 regulation targets. Today, electric cars are still mainly manufactured with an indirect cooling system for the electric engine, using water or air. But performances improvement will lead to the evolution of the cooling system towards a direct cooling system, which is more efficient.
It is in this context that TotalEnergies tried to better understand through simulation approach the efficiency of a direct oil cooling system, and show that it is, and will be the future for electric and hybrid cars.

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