Patent ID: 6871512

Claim:
A motor-driven compressor incorporated in an air conditioning system, for compressing and supplying a refrigerant to a refrigerant circuit of the air conditioning system, and receiving the refrigerant from the refrigerant circuit after the refrigerant is used for cooling, said motor-driven compressor comprising: an electric motor including a motor housing defining an armature chamber therein, and an armature housed in the armature chamber; a compression unit driven by said electric motor, said compression unit including a unit housing in which are defined a suction chamber for receiving the refrigerant from the refrigerant circuit, a discharge chamber for supplying the compressed refrigerant to the refrigerant circuit, and a rotor chamber accommodating a rotating member rotated by said electric motor, and a compression mechanism housed in the unit housing, the compression mechanism compressing the refrigerant sucked therein from the suction chamber and discharging the compressed refrigerant to the discharge chamber as the rotating member rotates; and a cooling channel for guiding the refrigerant returned from the refrigerant circuit to the suction chamber, said cooling channel including the armature chamber, and a downstream section extending from the armature chamber to the suction chamber in such a manner that the downstream section is separated from the rotor chamber.