FR3117412A1 - Motor vehicle ventilation system - Google Patents

Abstract

The subject of the invention is a ventilation system (1) comprising: a propeller (4) for generating an air flow (3), a drive motor (5) for the propeller (4) comprising a stator ( 6) and a rotor (7) comprising: a plurality of magnetic elements (8) arranged to generate a magnetic field (9), the ventilation system (1) being characterized in that the propeller (4) comprises a member feedback (10) of the magnetic field (9) generated by the rotor (7). Figure for abstract: Figure 3

Description

Motor vehicle ventilation system

The present invention relates to the field of ventilation systems for a heat exchanger. It relates more particularly to the integration of a drive motor for a propeller in the ventilation system.

Motor vehicles have many heat exchangers which allow the thermal regulation of the components necessary for the operation of a motor vehicle, for example an electric or combustion engine. Some of these heat exchangers ensure, by means of an air flow passing through them, a heat transfer with the component of the vehicle with which they are associated. This is particularly the case of a heat exchanger operating as a radiator and positioned on the front face of the motor vehicle. Such a radiator makes it possible to ensure the thermal regulation of the engine of the vehicle and is generally coupled to a ventilation system to form a thermal regulation system favoring the formation of an air flow for the management of the heat exchange between a heat transfer fluid circulating in the heat exchanger and the ambient air.

Usually, the ventilation system comprises a support frame carrying a propeller formed by a bowl from which extend a plurality of blades. The support frame has a mouth in which radially extend stiffening arms, which carry a central ring. The center ring of the support frame is provided to house the propeller drive motor. More particularly, the box comprising the drive motor is supported by the central ring of the support frame.

A disadvantage of such a ventilation system comes from the fact that the arrangement of the housing of the drive motor in the ring of the support frame limits the possibilities of compacting the ventilation system and prevents the dimensional reduction of the front face of the vehicle. automobile.

The object of the present invention is therefore to overcome the drawback cited above by designing a ventilation system comprising a drive motor, the integration of which into said ventilation system is optimized to increase the compactness of the latter, while maintaining optimal flow circulation performance.

The subject of the invention is a ventilation system comprising:

To. a propeller to generate an air flow,

b. a propeller drive motor comprising

i. a stator and

ii. a rotor comprising:

1. a plurality of magnetic elements arranged to generate a magnetic field,

the ventilation system being characterized in that the propeller comprises a device for looping back the magnetic field generated by the rotor.

The advantage of the invention being to use as little metal as possible, to reduce the size of the ventilation system while reducing the number of components. The invention also makes it possible to simplify the balancing of the system resulting in economic advantages.

According to one of the aspects of the invention, the magnetic field feedback member is made of metallic material.

According to one of the aspects of the invention, the magnetic field feedback member is annular in shape.

According to one of the aspects of the invention, the magnetic field feedback member is in one piece.

According to one of the aspects of the invention, the magnetic field feedback member is formed of a plurality of segments distributed, preferably evenly, around an axis of rotation of the motor.

According to one of the aspects of the invention, the propeller comprises a hub supporting blades which, when set in motion, will generate the air flow.

According to one of the aspects of the invention, the hub comprises a disk-shaped bottom and a peripheral wall which extends around the periphery of said bottom and extending in the axis of rotation of the motor, such that they delimit a dwelling.

According to one of the aspects of the invention, the housing is cylindrical in shape.

According to one of the aspects of the invention, the rotor of the propeller drive motor is housed entirely in the housing of the hub.

According to one of the aspects of the invention, the magnetic elements are arranged circumferentially in the housing of the hub, around the axis of rotation of the motor.

According to one of the aspects of the invention, the magnetic elements are surrounded by the device for looping back the magnetic field generated by the rotor.

According to one of the aspects of the invention, the magnetic elements are inside the annular profile of the loopback member.

According to one of the aspects of the invention, the magnetic elements are permanent ferrite magnets.

According to one of the aspects of the invention, the magnetic field feedback member is molded into the peripheral wall of the hub.

According to one of the aspects of the invention, the magnetic field feedback member is inserted into the housing of the hub.

According to one of the aspects of the invention, the peripheral wall is perforated opposite each magnet of the rotor to reduce the distance between the magnets and the looping member. This has the advantage of reducing magnetic flux losses and also allowing a gain in plastic material.

According to one of the aspects of the invention, the magnetic field feedback member has a diameter of between 100 and 130 millimeters.

According to one of the aspects of the invention, the magnetic field feedback member has a height of between 10 and 50 millimeters.

According to one of the aspects of the invention, the magnetic field feedback member has a thickness of between 1.5 and 2 millimeters.

The invention also relates to a ventilation system, independently or in combination with the foregoing and comprising:

To. a propeller to generate an air flow and

b. a propeller drive motor comprising

i. a stator and

ii. a rotor

the ventilation system being characterized in that the rotor is part of the propeller.

According to one of the aspects of the invention, the rotor comprises a plurality of magnetic elements arranged to generate a magnetic field.

According to one of the aspects of the invention, the plurality of magnetic elements is arranged circumferentially in the housing of the propeller.

According to one of the aspects of the invention, the magnetic elements are evenly distributed along the axis of rotation of the motor.

According to one of the aspects of the invention, the housing comprises elements for fixing the magnetic elements.

According to one of the aspects of the invention, the fixing elements extend circumferentially between the magnetic elements, around the axis of rotation of the motor.

According to one of the aspects of the invention, the magnetic elements are permanent magnets.

According to one of the aspects of the invention, the permanent magnets are made of ferrite.

According to one of the aspects of the invention, the space between each fixing element defines a space for receiving a magnet.

According to one of the aspects of the invention, the reception spaces are evenly distributed along the axis of rotation of the engine.

According to one of the aspects of the invention, the magnets are 9 or 12 in number.

According to one of the aspects of the invention, the magnets have straight edges parallel to the axis of rotation of the motor.

According to one of the aspects of the invention, the magnets have a curved shape so that they follow the cylindrical shape of the peripheral wall.

According to one of the aspects of the invention, the fixing elements are each secured to at least one circumferential end of a magnetic element.

According to one of the aspects of the invention, each fixing element is arranged circumferentially along the axis of rotation of the motor, between two magnetic elements and is then secured to one of the circumferential ends of a first magnetic element and to one of the circumferential ends of a second magnetic element.

According to one of the aspects of the invention, the fixing elements extend radially from the peripheral wall, in the housing.

According to one of the aspects of the invention, the fixing element and the circumferential end of the magnetic element have complementary shapes.

According to one of the aspects of the invention, the fixing elements of the magnetic elements extend in the axis of rotation of the drive motor of the propeller, over the entire height of the peripheral wall.

According to one of the aspects of the invention, the fixing elements are integral with the housing of the propeller.

According to one of the aspects of the invention, each of the fixing elements comprises a first fixing wall and a second fixing wall which emerge radially from the peripheral wall.

According to one of the aspects of the invention, the first and the second fixing wall each comprise a radial stop extending orthogonally to the fixing wall. It allows to radially lock the magnetic element inserted in the adjoining reception space. From a view along the axis of rotation, the fixing walls each have an L-shape with their radial abutment. These two L-shapes are back to back and the radial abutments extend opposite one of them. 'other.

According to one of the aspects of the invention, the radial stop extends over the entire height of the fastening elements.

According to one of the aspects of the invention, each of the magnetic elements comprises a first circumferential end and a second circumferential end, opposite each other on the magnetic element and such that each faces one of the fasteners.

According to one of the aspects of the invention, the first circumferential end and the second circumferential end of the magnetic elements have a chamfered shape, so that they are able to cooperate with each radial stop of the fixing elements.

According to one of the aspects of the invention, one of the magnetic elements is arranged circumferentially between a first fixing element and a second fixing element separated from each other in the housing. The first circumferential end of said magnetic element is then fixed to the second fixing wall of the first fixing element while the second circumferential end is fixed to the first fixing wall of the second fixing element. It is understood that this characteristic of the magnetic element applies to all of the magnetic elements of the propeller drive motor.

According to one of the aspects of the invention, the fixing elements comprise on each fixing wall, a longitudinal stop which extends from the bottom of the housing and in the axis of rotation of the drive motor of the propeller . These stops block the magnetic elements in the axis of rotation of the propeller drive motor.

According to one of the aspects of the invention, the peripheral wall comprises, between each fixing element, at least one gadroon enabling the magnetic elements to be supported against the longitudinal stops once the magnetic elements have been assembled in the housing of the propeller. .

According to one of the aspects of the invention, the gadroons extend radially from an upper part of the peripheral wall opposite the bottom.

According to one of the aspects of the invention, the magnetic elements are positioned by force on the fixing elements. This assembly is advantageous in that it makes it possible to avoid the use of glue. Glue is an assembly process that generates constraints during industrialization.

The invention also relates to a ventilation system, independently or in combination with the foregoing and comprising:

To. a propeller to generate an air flow

b. a propeller drive motor comprising

i. a motor shaft,

the ventilation system being characterized in that it further comprises a rolling bearing, to assemble the propeller on the motor shaft with freedom of rotation from one relative to the other.

According to one of the aspects of the invention, the rolling bearing is chosen from: a ball, needle or roller bearing.

According to one of the aspects of the invention, a connection opening is formed in the bottom of the housing and comprises a raised edge at the periphery, the raised edge extending into the housing of the propeller.

According to one of the aspects of the invention, the raised edge forms a cylinder in which the bearing is arranged.

According to one of the aspects of the invention, the bearing extends around the motor shaft, between the latter and the raised edge.

According to one of the aspects of the invention, the bearing comprises a first rotation bearing and a second rotation bearing.

According to one of the aspects of the invention, the raised edge comprises a first housing, on the motor side and capable of receiving the first rotation bearing.

According to one of the aspects of the invention, the raised edge comprises a second housing, on the side opposite to the housing of the propeller and capable of receiving the second rotation bearing.

According to one of the aspects of the invention, a spacer separates the first housing from the second housing.

According to one of the aspects of the invention, the first rotation bearing and/or the second rotation bearing are force-fitted in their respective housings.

According to one of the aspects of the invention, the spacer is made in one piece with the raised edge and extends in the direction and along the axis of rotation of the drive motor.

According to one of the aspects of the invention, the first rotation bearing and the second rotation bearing are ball bearings each comprising an inner ring and an outer ring 48.

According to one of the aspects of the invention, the outer rings of the ball bearings rest on either side of the spacer.

According to one of the aspects of the invention, the first rotation bearing and/or the second rotation bearing are molded into the hub.

According to one of the aspects of the invention, the first rotation bearing and the second rotation bearing are of different sizes.

According to one of the aspects of the invention, the first rotation bearing has a diameter smaller than a diameter of the second rotation bearing.

According to one of the aspects of the invention, the outer rings of the rotation bearings are grooved to guarantee better retention in their housings on the raised edge.

According to one of the aspects of the invention, the spacer which separates the two rotation bearings is an added part.

According to one of the aspects of the invention, the motor shaft has a thread on which is mounted a clamping nut.

According to one of the aspects of the invention, the clamping nut bears against the inner ring of the second rotation bearing.

According to one of the aspects of the invention, the clamping nut is entirely housed in the second housing.

According to one of the aspects of the invention, the shaft of the motor is fixed in a tapped hole of a cylindrical central column.

According to one of the aspects of the invention, the end of the central column forms a flat support surface.

According to one of the aspects of the invention, the inner ring of the first rotation bearing bears against the flat bearing surface of the central column.

According to one of the aspects of the invention, the raised edge of the connection opening is reinforced by ribs.

According to one of the aspects of the invention, the ribs extend from the raised edge to the peripheral wall.

According to one of the aspects of the invention, the ribs have a greater height on the side of the raised edge than on the side of the peripheral wall.

According to one of the aspects of the invention, the ribs are formed by a maximum height which is less than a height of the raised edge.

According to one of the aspects of the invention, the bearing can be formed by raised pins emerging from the bottom of the housing and integral with the bottom of the housing.

The invention also relates to a ventilation system, independently or in combination with the foregoing and for which the propeller is formed of a plastic holding.

According to one of the aspects of the invention, the hub comprises a crown from which the blades of the propeller extend radially, the crown surrounding the peripheral wall.

According to one of the aspects of the invention, the crown and the housing are connected by ribs extending in an axis of rotation of the propeller drive motor.

According to one of the aspects of the invention, the ribs are of a height equal to a height of the crown.

According to one of the aspects of the invention, the peripheral wall extends beyond the height of the crown in the axis of rotation of the propeller drive motor.

According to one of the aspects of the invention, the drive motor of the propeller is an electronically commutated motor.

According to one of the aspects of the invention, the stator of the propeller drive motor comprises an electromagnetic winding, intended to be traversed by an electric current, such that the latter generates an induced magnetic field. The magnetic field thus created by the electromagnetic winding of the stator makes it possible, in cooperation with the magnetic elements positioned on the periphery of the housing, to propel the rotor in rotation around the axis of rotation of the drive motor.

According to one of the aspects of the invention, depending on the flow of electric current in the electromagnetic winding, the magnetic field that the latter generates can attract or repel the rotor relative to the magnetic elements. This allows rotary movement of the rotor in opposite directions of rotation and thus rotational movement of the propeller in opposite directions of rotation.

According to one of the aspects of the invention, the electromagnetic winding of the stator is housed in the housing of the propeller.

According to one of the aspects of the invention, the ventilation system detailed above is very particularly intended for a motor vehicle, in particular a front face of a motor vehicle.

According to one of the aspects of the invention, the ventilation system, mounted on a nozzle, can be associated with a heat exchanger, for example a radiator, and then has the function of channeling the flow of air from or to this heat exchanger.

Other characteristics, details and advantages of the invention will appear on reading the detailed description below, and on analyzing the appended drawings, in which:

schematically represents a rear and perspective view of the ventilation system according to an embodiment of the invention;

is a schematic perspective view of the ventilation system of the , from a front view;

is a schematic perspective view of the propeller of the ventilation system of Figures 1 and 2;

is a schematic perspective view of the propeller hub of the with the looping device visible and without the magnetic elements of the rotor;

is a schematic perspective view of the propeller hub of the with the magnetic elements of the rotor of the drive motor of the ;

is a detailed and schematic view of the fixing elements of the magnetic elements of the ;

is a partial and schematic front view of the hub housing of the ;

is a schematic sectional view of the hub of the without the first rotation bearing and without the second rotation bearing;

is a schematic sectional view of the hub of the with the first rotation bearing and the second rotation bearing;

is a schematic sectional view of the propeller assembled on the motor shaft of the drive motor of the .

detailed description

There describes a ventilation system 1 in particular of a motor vehicle. As illustrated in this , the ventilation device 1 comprises a propeller 4 to generate an air flow 3, a drive motor 5 of the propeller 4 which comprises a stator 6 and a rotor 7 which comprises a plurality of magnetic elements 8 arranged to generate a magnetic field 9, the ventilation system 1 is characterized in that the propeller 4 comprises a member 10 for looping back the magnetic field 9 generated by the rotor 7.

There shows visible the loopback member 10 of the magnetic field 9, which is made of metallic material.

The feedback member 10 of the magnetic field 9 is annular in shape.

According to one embodiment of the invention, the feedback member 10 of the magnetic field 9 is in one piece.

According to another embodiment of the invention, the loopback member 10 of the magnetic field 9 is formed of a plurality of segments 11 distributed, preferably evenly, around an axis of rotation 12 of the motor 5.

As illustrated by and 5, the propeller 4 comprises a hub 13 supporting blades 14 which, when moved, will generate the air flow 3.

The hub 13 comprises a disc-shaped bottom 15 and a peripheral wall 16 which extends around the periphery of said bottom 15 and extending in the axis of rotation 12 of the motor 5, such that they delimit a housing 17 The housing 17 is cylindrical in shape.

The rotor 7 of the drive motor 5 of the propeller 4 is housed entirely in the housing 17 of the hub 13.

The magnetic elements 8 are arranged circumferentially in the housing 17 of the hub 13, around the axis of rotation 12 of the motor, as can be seen on the .

The magnetic elements 8 are surrounded by the loopback member 10 of the magnetic field 9 generated by the rotor 7. More precisely, the magnetic elements 8 are inside the annular profile of the loopback member 10.

The magnetic elements 8 are permanent ferrite magnets.

The loopback member 10 of the magnetic field 9 is molded into the peripheral wall 16 of the hub 13.

According to a variant of the invention not shown in the figures, the loopback member 10 of the magnetic field 9 is inserted into the housing 17 of the hub 13.

There particularly illustrates the peripheral wall 16 which is perforated facing each magnet 8 of the rotor 7 to reduce the distance between the magnets 8 and the looping member 10.

The loopback member 10 of the magnetic field 9 has a diameter 18 of between 100 and 130 millimeters.

The loopback member 10 of the magnetic field 9 has a height 19 of between 10 and 50 millimeters.

The loopback member 10 of the magnetic field 9 has a thickness 20 of between 1.5 and 2 millimeters.

THE to 10 illustrate a ventilation system 1 which comprises a propeller 4 for generating an air flow 3 and a drive motor 5 of the propeller 4 comprising a stator 6 and a rotor 7, the ventilation system 1 being characterized in that rotor 7 is part of propeller 4.

The rotor 7 comprises a plurality of magnetic elements 8 arranged to generate a magnetic field 9.

As illustrated by , the plurality of magnetic elements 8 is arranged circumferentially in the housing 17 of the propeller 4. The magnetic elements 8 are distributed evenly along the axis of rotation 12 of the motor 5.

Figures 4 and 5 illustrate the housing 17 which comprises fixing elements 21 of the magnetic elements 8.

And as illustrated in Figures 4 and 5, the fixing elements 21 extend circumferentially between the magnetic elements 8, around the axis of rotation 12 of the motor 5.

The magnetic elements 8 are permanent magnets.

The permanent magnets 8 are ferrite.

The detailed view of the clearly shows that the space between each fixing element 21 defines a space 22 for receiving a magnet 8.

As shown in the figures, the reception spaces 22 are evenly distributed along the axis of rotation 12 of the motor 5.

Magnets 8 are 9 or 12 in number.

The magnets 8 have straight edges 23 parallel to the axis of rotation 12 of the motor 5.

The magnets 8 have a curved shape so that they follow the cylindrical shape of the peripheral wall 16.

The fixing elements 21 are each secured to at least one circumferential end 24 of a magnetic element 8.

Each fixing element 21 is arranged circumferentially along the axis of rotation 12 of the motor 5, between two magnetic elements 8 and is then secured to one of the circumferential ends 24 of a first magnetic element 25 and to one of the circumferential ends 24 of a second magnetic element 26.

Fasteners 21 extend radially from peripheral wall 16, into housing 17.

The fixing element 21 and the circumferential end 24 of the magnetic element 8 have complementary shapes. It is understood that the complementary shapes of the fixing element 21 and of the circumferential end 24 of the magnetic element 8 allow the latter to be integral with one another.

The fixing elements 21 of the magnetic elements 8 extend in the axis of rotation 12 of the drive motor 5 of the propeller 4, over an entire height 27 of the peripheral wall 16.

The fixing elements 21 are integral with the housing 17 of the propeller 4.

The detailed view of the particularly illustrates that each of the attachment elements 21 comprises a first attachment wall 28 and a second attachment wall 29 which emerge radially from the peripheral wall 16.

The first fixing wall 28 and the second fixing wall 29 each comprise a radial stop 30, particularly visible on the , extending orthogonally to the fixing wall 28 or 29. The radial stop 30 makes it possible to radially lock the magnetic element 8 inserted into the adjoining reception space 22 . From a view along the axis of rotation 12, the fixing walls 28 and 29 each have an L-shape with their radial abutment 30. These two L-shapes are back to back and the radial abutments 30 extend to the opposite each other.

The radial stop 30 extends over an entire height 31 of the fixing elements 21.

There illustrates in detail that each of the magnetic elements 8 comprises a first circumferential end 32 and a second circumferential end 33, opposite one another on the magnetic element 8 and such that each faces one of the elements fixing 21.

Always according to , the first circumferential end 32 and the second circumferential end 33 of the magnetic elements 8 have a chamfered shape, so that they are able to cooperate with each radial stop 30 of the fixing elements 21. It is therefore understood that the circumferential ends 24 magnetic elements 8 and the fixing elements 21 have complementary shapes, ensuring the fixing of said magnetic elements 8 in the housing 17.

One of the magnetic elements 8 is arranged circumferentially between a first fixing element 34 and a second fixing element 35 separated from each other in the housing 17. The first circumferential end 32 of said magnetic element 8 is then secured to the second fixing wall 29 of the first fixing element 34 while the second circumferential end 33 is integral with the first fixing wall 28 of the second fixing element 35. It is understood that this characteristic of the magnetic element 8 presented in detail at applies to all of the magnetic elements 8 of the drive motor 5 of the propeller 4.

The fixing elements 21 comprise on each fixing wall 28 29, a longitudinal stop 36 which extends from the bottom 15 of the housing 17 and in the axis of rotation 12 of the drive motor 5 of the propeller 4. These stops 36 block the magnetic elements 8 in the axis of rotation 12 of the drive motor 5 of the propeller 4.

As only shown in , the peripheral wall 16 comprises, according to one embodiment of the invention, between each fastening element 21, at least one gadroon 37 allowing the magnetic elements 8 to be supported against the longitudinal stops 36 once the magnetic elements 8 have been assembled in housing 17 of propeller 4.

The gadroons 37 extend radially from an upper part of the peripheral wall 16 opposite the bottom 15.

The magnetic elements 8 are thus positioned by force on the fixing elements 21.

There illustrates a ventilation system 1 which comprises a propeller 4 for generating an air flow 3, a drive motor 5 of the propeller 4 which comprises a motor shaft 38, the ventilation system 1 being characterized in that it further comprises a rolling bearing 39, to assemble the propeller 4 on the motor shaft 38 with freedom of rotation of one relative to the other.

The rolling bearing 39 is chosen from: a ball, needle or roller bearing.

As illustrated in particular in Figures 8 to 10, a connection opening 40 is provided in the bottom 15 of the housing 17 and comprises a raised edge 41 at the periphery, the raised edge 41 extending into the housing 17 of the propeller 4.

The raised edge 41 forms a cylinder in which the bearing 39 is arranged.

The bearing 39 extends around the motor shaft 38, between the latter and the raised edge 41.

As illustrated in and 10, bearing 39 includes a first rotational bearing 42 and a second rotational bearing 43.

There clearly shows that, according to one embodiment of the invention, the raised edge 41 comprises a first housing 44, on the side of the motor 5 and capable of receiving the first rotation bearing 42.

The raised edge 41 comprises a second housing 45, on the opposite side to the housing 17 of the propeller 4 and capable of receiving the second rotation bearing 43.

A spacer 46 separates the first housing 44 from the second housing 45.

According to an embodiment of the invention shown in the figures, the first rotation bearing 42 and/or the second rotation bearing 43 are force-fitted in their respective housings 44, 45.

The spacer 46 is then made in one piece with the raised edge 41 and extends in the direction and along the axis of rotation 12 of the drive motor 5.

According to an embodiment of the invention also illustrated in Figures 9 and 10, the first rotation bearing 42 and the second rotation bearing 43 are ball bearings each comprising an inner ring 47 and an outer ring 48.

The outer rings 48 of the ball bearings rest on either side of the spacer 46.

According to another embodiment not illustrated in the figures, the first rotation bearing 42 and/or the second rotation bearing 43 are molded into the hub 13.

According to this embodiment, the first rotation bearing 42 and the second rotation bearing 43 can be of different sizes and the first rotation bearing 42 has a diameter 49 less than a diameter 50 of the second rotation bearing 43.

The outer rings 48 of the rotation bearings 42, 43 can then be grooved to guarantee better retention in their housings 44, 45 of the raised edge 41. The spacer 46 which separates the two rotation bearings 42, 43 must then be a part reported.

There illustrates the motor shaft 38 which has a thread 51 on which is mounted a clamping nut 52.

The tightening nut 52 rests on the inner ring 47 of the second rotation bearing 43.

As illustrated in , the tightening nut 52 is entirely housed in the second housing 45.

The motor shaft 38 is fixed in a tapped hole 53 of a central cylindrical column 54.

The end of the central column 54 forms a flat bearing surface 55.

The inner ring 47 of the first rotation bearing 42 rests on the flat bearing surface 55 of the central column 54.

According to one embodiment of the invention, the raised edge 41 of the connection opening 40 is reinforced by ribs 56.

The ribs 56 extend from the raised edge 41 to the peripheral wall 16 and have a greater height 64 on the side of the raised edge 41 than on the side of the peripheral wall 16.

The ribs 56 are formed by a maximum height 65 which is less than a height of the raised edge 41.

According to another embodiment of the invention, the bearing 39 can be formed by raised pins 57 emerging from the bottom 15 of the housing 17 and integral with the bottom 15 of the housing 17.

According to one embodiment of the invention, the propeller 4 is formed from a holding piece of plastic material.

The hub 13 comprises a crown 58 from which the blades 14 of the propeller 4 extend radially, the crown 58 surrounding the peripheral wall 16.

The crown 58 and the housing 17 are connected by ribs 59 extending in an axis of rotation 12 of the drive motor 5 of the propeller 4.

The ribs 59 are of a height 65 equal to a height of the crown 58.

The peripheral wall 16 extends beyond the height of the crown 58 in the axis of rotation 12 of the drive motor 5 of the propeller 4.

Propeller 4 drive motor 5 is an electronically commutated motor.

The stator 6 of the drive motor 5 of the propeller 4 comprises an electromagnetic winding 60, not shown in the figures, intended to be traversed by an electric current 61, such that the latter generates an induced magnetic field 62. The magnetic field 62 thus created by the electromagnetic winding 60 of the stator 6 makes it possible, in cooperation with the magnetic elements 8 positioned on the periphery of the housing 17, to propel the rotor 7 in rotation around the axis of rotation 12 of the drive motor 5.

Depending on the circulation of the electric current 61 in the electromagnetic coil 60, the magnetic field 62 that the latter generates can attract or repel the rotor 7 with respect to the magnetic elements 8. This allows the rotary movement of the rotor 7 in opposite directions of rotation. and thus a rotational movement of the propeller 4 in directions of rotation opposite to each other.

The electromagnetic winding 60 of the stator 6 is housed in the housing 17 of the propeller 4.

The ventilation system 1 detailed above is very particularly intended for a motor vehicle, in particular a front face of a motor vehicle.

The ventilation system 1, mounted on a nozzle 63, can be associated with a heat exchanger 2, for example a radiator, and then has the function of channeling the air flow 3 from or to this heat exchanger 2.

The invention cannot however be limited to the means and configurations exclusively described and illustrated, and also applies to all means or configurations, equivalents and to any combination of such means or configurations.

Claims (11)

Ventilation system (1) comprising:

1. a propeller (4) for generating an air flow (3),
2. a drive motor (5) of the propeller (4) comprising
   1. a stator (6) and
   2. a rotor (7) comprising:
      1. a plurality of magnetic elements (8) arranged to generate a magnetic field (9),

the ventilation system (1) being characterized in that the propeller (4) comprises a feedback device (10) of the magnetic field (9) generated by the rotor (7). Ventilation system (1) according to the preceding claim, the feedback device (10) of the magnetic field (9) is annular in shape. Ventilation system (1) according to any one of claims 1 and 2, the loopback member (10) of the magnetic field (9) is in one piece. Ventilation system (1) according to any one of claims 1 and 2, the looping member (10) of the magnetic field (9) is formed of a plurality of segments (11) distributed, preferably in a regular manner, around an axis of rotation (12) of the motor (5). Ventilation system (1) according to any one of the preceding claims, the propeller (4) comprises a hub (13) supporting blades (14) which, when set in motion, will generate the air flow (3). Ventilation system (1) according to the preceding claim, the hub (13) comprises a disc-shaped bottom (15) and a peripheral wall (16) which extends around the periphery of said bottom (15) and extending in a axis of rotation (12) of the motor (5), so that they delimit a housing (17). Ventilation system (1) according to the preceding claim, the magnetic elements (8) are arranged circumferentially in the housing (17) of the hub (13), around the axis of rotation (12) of the motor (5). Ventilation system (1) according to any one of the preceding claims, the magnetic elements (8) are surrounded by the feedback device (10) of the magnetic field (9) generated by the rotor (7). Ventilation system (1) according to claim 6, the looping member (10) of the magnetic field (9) is molded into the peripheral wall (16) of the hub (13). Ventilation system (1) according to claim 6, the looping member (10) of the magnetic field (9) is inserted in the housing (17) of the hub (13). Ventilation system (1) according to one of the preceding claims, intended for a motor vehicle, in particular a motor vehicle front end.