Patent ID: 7530230

Claim:
A supercharger with an electric motor comprising: (a) a turbine impeller rotationally driven by an exhaust gas of an internal combustion engine; (b) a turbine housing surrounding the turbine impeller; (c) a compressor impeller coupled to the turbine impeller by a shaft and rotating so as to compress an intake air; (d) a compressor housing surrounding the compressor impeller; (e) an electric motor positioned between the turbine impeller and the compressor impeller and disposed to rotationally drive the shaft; and (f) a center housing rotatably supporting the shaft and having the electric motor built-in, wherein an inner side of the center housing is provided with i. an air introduction path disposed to introduce compressed air that is discharged from an outlet of the compressor impeller within the compressor housing to the electric motor; ii. a cooling structure portion disposed to cool air flowing through the air introduction path; and iii. a cooling fluid flow path formed so as to surround the electric motor, wherein the air introduction path is disposed to flow compressed air toward a turbine impeller side of the supercharger so as to introduce compressed air to a turbine impeller side of the electric motor, wherein the cooling structure portion is formed on an outside position of the cooling fluid flow path, and the cooling structure portion is disposed to exchange heat between cooling fluid flowing in the cooling fluid flow path and air flowing through the air introduction path.