Motor cooling system

Abstract

In a motor cooling system that cools a motor by using a refrigerant in which oil is contained in CO2, the oil in the motor is reliably discharged. The motor cooling system mounted on a vehicle includes a compressor for compressing the refrigerant in which the oil is contained in CO2; a heat exchanger for cooling the refrigerant compressed by the compressor; the motor for driving the vehicle; refrigerant passages for supplying the refrigerant cooled by the heat exchanger into the motor; and a controller controlling the compressor, and the controller controls the compressor to generate the refrigerant in a supercritical state such that the refrigerant in the supercritical state is supplied from the refrigerant passage into the motor when a supercritical refrigerant supply condition is satisfied.

Dependencies are inferred from the claim text.