The mounting frame 70 which is arranged in the motor part 18 further defines a contact supporting portion 74 supporting electric contacts 78 of the electric connector portion 38. The electric contacts 78 are electrically connected to the electronic circuit board 50. The mounting frame 70 partly forms a motor can 82 which is closed at one axial can end facing the electronic circuit board 50 by a separate cover 86 (see FIG. 2). The separate cover 86 fluidically separates a gas section 88 (see FIG. 2) provided within the motor can 82 from the electronics chamber 46.

The mounting frame 70 comprises at an outer side a plurality of longitudinal ribs 90 being provided in a longitudinal direction to the motor can 82 and transversal ribs 92 being provided in a transversal direction to the motor can 82. These ribs 90, 92 improve a heat dissipation of the mounting frame 70 and the mechanical stiffness of the mounting frame 70.

The motor can 82 is radially surrounded by the bundle of laminated sheets 60. Heat of the motor stator 58 is dissipated to the cooler gas in the motor can 82 via the bundle of laminated sheets 60. Heat dissipation of the mounting frame 70 is further improved by a thermally high-conductive filler material provided in the plastic material of the mounting frame 70, for example, mineral or ceramic particles.