초록 ▼

A fan unit for cooling an internal combustion engine comprising a fan impeller associated with a coaxial channel for guiding the air travelling through said impeller and an electric driving motor of DC type. The channel is fixed to the ends of the blades of the impeller and rotates with the impeller

A fan unit for cooling an internal combustion engine comprising a fan impeller associated with a coaxial channel for guiding the air travelling through said impeller and an electric driving motor of DC type. The channel is fixed to the ends of the blades of the impeller and rotates with the impeller and itself constitutes the rotor of the electric motor whose stator coaxially surrounds at least a part of the channel. The stator is rigid with a fixed shaft around which the impeller rotates. This fan unit has a high permeability when inoperative so that it is particularly adapted for use in an automobile vehicle.

대표청구항 ▼

A fan unit for cooling an internal combustion engine of an automobile vehicle, said unit comprising a shaft, a fan impeller having a hub of minimum radial size and blades, and rotatable about said shaft in a given plane and an electric driving motor drivingly connected to the impeller, said motor co

A fan unit for cooling an internal combustion engine of an automobile vehicle, said unit comprising a shaft, a fan impeller having a hub of minimum radial size and blades, and rotatable about said shaft in a given plane and an electric driving motor drivingly connected to the impeller, said motor comprising a stator disposed radially outside the impeller relative to said shaft, field coils on the stator and a rotor including an exterior annular body which is made from a ferromagnetic material and is electrically cooperative with the coils of the stator and connected to rotate with said blades, the outer annular body of the rotor being formed by a tubular channel for guiding a flow of air through the unit, said channel having an outer periphery and including on said outer periphery permanent magnets which are cooperative with said stator, said channel and said magnets being substantially sheet-like elements extending in directions parallel to said shaft and circumferentially of said shaft and having no flange in planes perpendicular to said shaft so as to offer minimum resistance to said flow of air, said electric motor being of a DC autosynchronous type supplied with power by an electronic circuit which is connected thereto and generates periodic signals.