To discharge this heat, it is already known practice to use the air flow passing through the wheel (providing the ventilation) to cool the printed circuit board.

When the motor is operating, the electronic circuit board is acted upon and the printed circuit gives off heat. These electric fans are controlled by a control device supported by an electronic circuit board implemented on a printed circuit. These electric fans comprise in particular a motor driving a wheel associated with a cooling means. Motor vehicles are increasingly fitted with electric fans providing their air conditioning. More particularly it involves cooling with the aid of pressurized ambient air the electronic control of an air conditioning motor. The present invention relates to an electronically controlled electric fan cooled by pressurized ambient air. The electric fan as claimed in claim 2, characterized in that the seal creates a plurality of sealed cooling cavities ( 24) in contact with the heat sink ( 18) of the electronic control circuit ( 14). The electric fan as claimed in claim 7, characterized in that said fan also comprises water discharge orifices ( 25).Д©. The electric fan as claimed in claim 1, characterized in that said fan has at least one confinement chamber ( 24) allowing the pressurized ambient air to contact the heat sink ( 18).ДЁ. The electric fan as claimed in claim 1, characterized in that the seal ( 20) is overmolded and allows the detachment of the electric fan and access to the electronic components.Д§. The electric fan as claimed in claim 1, characterized in that the seal ( 20) is detachable and removable in order to allow access to the electronic components.Д¦. The electric fan as claimed in claim 1, characterized in that the electronic control circuit ( 14) is placed in the cover ( 12) and in that the seal ( 20) is interposed between the electronic circuit ( 14) and the rest of the elements housed in the motor casing ( 13).ДҐ. The electric fan as claimed in claim 1, characterized in that the seal creates a plurality of sealed cooling cavities ( 24) in contact with the heat sink ( 18) of the electronic control circuit ( 14).Д¤.

The electric fan as claimed in claim 1, characterized in that the seal is made by overmolding the casing or by adding the seal or by depositing flexible material.ДЈ. An electronically controlled electric fan ( 10) cooled by pressurized ambient air, said electric fan comprising: a motor ( 11) furnished with a cover ( 12), a mechanical assembly rotating a fan wheel ( 15) and a casing ( 13), said motor housing at least its electronic control circuit ( 14) and comprising at least one inlet orifice (I) and one outlet orifice (S) for the pressurized ambient air, the fan wheel ( 15), a motor support ( 16), said ambient air being suitable for passing through the motor, and its mechanical assembly and the support, said electric fan being characterized in that it also comprises: a confinement means ( 20) placed inside the motor so as to confine the pressurized ambient air between: a heat sink ( 18) integral with the electronic control circuit ( 14), and a portion of the motor comprising no sensitive electronic components, wherein the confinement means is a seal, placed between the electronic control circuit ( 14) and the casing ( 13) of the motor, said seal channeling the pressurized ambient air at least onto said heat sink ( 18) situated on a surface of the electronic control circuit without electronic components.Дў.

Siemens vdo automotive electric fan