Motor-driven compressor

A motor-driven compressor comprising:

• a compression mechanism compressing a refrigerant gas;
• a rotary shaft rotating to drive the compression mechanism;
• an electric motor connected to the rotary shaft;
• a motor drive circuit for driving the electric motor, the motor drive circuit having a plurality of electronic components;
• a connecting terminal electrically connected the electric motor to the motor drive circuit;
• a housing assembly in which the compression mechanism, the electric motor and the motor drive circuit are disposed along the axial direction of the rotary shaft, the housing assembly having:
• a first housing for mounting the electric motor and the compression mechanism, the first housing having a cylindrical shape with one end closed, the first housing having a fastening portion at the radially peripheral portion of the first housing;
• a second housing having a terminal mounting portion for fixing the connecting terminal, the second housing having a fastening portion at the radially peripheral portion of the second housing, the second housing thermally coupled to the electric component of the motor drive circuit;
• and
• a third housing having a cylindrical shape with one end closed, the third housing joined to the second housing to form an accommodation space for accommodating the motor drive circuit,
• wherein a closed casing is formed by fastening the fastening portion of the second housing to the fastening portion of the first housing by means of a first bolt, and connecting the second housing to the open end of the first housing.