Motor-driven supercharger

A motor-driven supercharger comprising:

• a turbine shaft having a turbine impeller in one end;
• a compressor impeller rotationally driven by the turbine shaft;
• a bearing housing rotatably supporting the turbine shaft;
• a compressor housing rotatably surrounding the compressor impeller and coupled to the bearing housing;
• a motor stator fixed within the bearing housing;
• and
• a motor rotor rotationally driven by the motor stator,
• wherein the motor-driven supercharger comprises:
• a stator assembly inserted and attached to the bearing housing;
• and
• 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 has the motor stator and an outer sleeve having an inner peripheral surface closely attached to an outer peripheral surface of the motor stator and supporting the motor stator in such a manner as to constrain a rotation of the motor stator, the motor stator and the outer sleeve form an integral part so as to construct the stator assembly, and the outer sleeve constructs 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.