Patent ID: 8152489

Claim:
A motor-driven supercharger comprising: (a) a turbine shaft having a turbine impeller in one end; (b) a compressor impeller rotationally driven by the turbine shaft; (c) a bearing housing rotatably supporting the turbine shaft; (d) a compressor housing rotatably surrounding the compressor impeller and coupled to the bearing housing; (e) a motor stator fixed within the bearing housing; (f) a motor rotor rotationally driven by the motor stator; (g) a stator assembly inserted and attached to the bearing housing; and (h) a seal plate closely attached to a compressor side of the stator assembly and comparting between the compressor housing and the motor stator, wherein the stator assembly includes i. the motor stator; and ii. an outer sleeve having an inner peripheral surface closely attached to an outer peripheral surface of the motor stator and the outer sleeve supports the motor stator in order to constrain a rotation of the motor stator, wherein the motor stator and the outer sleeve form an integral part, and an intermediate portion of the outer sleeve defines a liquid tight water cooling jacket between the outer sleeve and the bearing housing, and wherein the outer sleeve and the seal plate are fastened together in an axial direction between the bearing housing and the compressor housing.