Fan arrangement

A fan arrangement adapted for use in association with a circuit board (17) formed with a first opening (80) and bearing a plurality of heat-generating components (11), the fan arrangement comprising

• an electric motor (18) serving, in operation, to drive a fan wheel (26;
• 170);
• an air-directing element (100) associated with the fan wheel;
• an internal stator (44) and an external rotor (22), the fan wheel (26;
• 170) being drivingly connected to the external rotor, said internal stator (44) of said motor being mounted on a first side of the circuit board (17), said fan wheel also being arranged on said first side;
• the air-directing element (100) being adapted for mounting on the circuit board (17) separately from the electric motor (18), and having a portion (108) which is adapted to define, together with the circuit board (17), an air conduit (127), so that, in operation, a cooling air flow (13) is generated by the fan wheel (170), which air flow (13) emerges from the fan arrangement (16) and is directed in a targeted manner by the air conduit (127), to thereby cool components in specific sectors on the circuit board (17), which components are arranged at respective locations radially surrounding said air conduit (127), the air flow (13) being correspondingly reduced in sectors where little cooling air is needed;
• the motor including a bearing tube (38), the bearing tube (38) having a longitudinal central axis (41) of rotation, and being attached to said internal stator (44) of the motor, so that the bearing tube can be inserted, during assembly of said motor, into said first opening (80) of said circuit board (17) from said first side of the circuit board (17), on which the fan wheel (26;
• 170) is to be located;
• the motor being secured to the circuit board at a plurality of points located within said air conduit (127) defined between said circuit board (17) and said air-directing element (100).