FR3064696A1 - ELECTRICAL POWER SUPPLY COMPRESSOR FOR A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to an electric supercharger (10) particularly for a motor vehicle, comprising in a same housing (20): - an electric motor (30) comprising a transmission shaft (32) having a rotational movement around an axis of rotation (A), - a wheel (40) driven in rotation by the transmission shaft (32) of the electric motor (30), - an electronic unit (50) for supplying power and / or controlling the electric motor (30), characterized in that the electric supercharger (30) also comprises: - a protective screen (60) arranged at least partially between the transmission shaft (32) and the electronic unit ( 50).

Description

Holder (s): VALEO MOTOR CONTROL SYSTEMS Simplified joint-stock company.

Extension request (s)

Agent (s): VALEO MOTOR CONTROL SYSTEMS.

ELECTRIC SUPPLY COMPRESSOR FOR A MOTOR VEHICLE.

FR 3 064 696 - A1

The invention relates to an electric supercharging compressor (10) in particular for a motor vehicle, comprising in the same casing (20):

- an electric motor (30) comprising a transmission shaft (32) having a rotational movement around an axis of rotation (A),

- a wheel (40) rotated by the transmission shaft (32) of the electric motor (30),

- an electronic unit (50) for supplying power and / or controlling the electric motor (30), characterized in that the electric supercharging compressor (30) also comprises:

- a protective screen (60) arranged at least partially between the transmission shaft (32) and the electronic unit (50).

i

Electric supercharger for a motor vehicle

The subject of the invention is an electric supercharging compressor, in particular for a motor vehicle, comprising in the same casing: an electric motor and an electronic unit making it possible to supply power and / or to control the electric motor.

Usually, an electric supercharging compressor, in particular for a motor vehicle, comprises an electric machine comprising an electric motor coupled with a wheel, and an electronic power module configured to supply power to the electric motor.

The wheel is rotated by a drive shaft of the electric motor so as to compress the air.

The electric motor and the wheel are arranged in the same casing, and the electronic power module is generally placed outside the casing of the electric motor so that the electronic power module is located outside the engine operating zone. The operating area of the electric motor corresponds to the space between the wheel and the electric motor, around the transmission axis of the electric motor.

However, in order to reduce the dimensions of the electric supercharging compressor, the electronic power module can be placed within the casing comprising the electric motor, and thus be arranged at the operating zone of the electric motor.

When the electric motor is in operation, pollution particles can be generated within the housing between the electric motor and the wheel, and consequently within the housing in which the electronic power module is then also located.

These particles, in particular metallic particles, are capable of causing short circuits within the electronic power module, in particular when the particles are of dimension greater than 600 μm.

There is therefore a need for an electric supercharging compressor, in which the electronic power module is protected from the metallic particles generated during the operation of the electric motor.

The present invention aims to remedy this drawback by proposing an electric supercharging compressor comprising in one housing an electric motor and an electronic power module, in which the coming of pollution particles in contact with the electronic power module is prevented, in order avoid short circuits within the electric supercharger, while having reduced dimensions compared to electric superchargers according to the prior art.

To this end, the subject of the invention is an electric supercharging compressor, in particular for a motor vehicle, comprising in the same casing:

an electric motor comprising a transmission shaft having a rotational movement about an axis, a wheel driven in rotation by the transmission shaft of the electric motor, an electronic unit for supplying power and / or controlling the motor electric, characterized in that the electric supercharger also includes:

a protective screen disposed at least partially between the transmission shaft and the electronic unit.

Advantageously, the screen according to the invention makes it possible to prevent particles of pollution, and in particular metal particles, generated during the operation of the electric motor from coming into contact with the electronic unit. Indeed, the screen obstructs the passage of pollution particles, such as particles larger than 600 μm, and therefore makes it possible to avoid possible short circuits within the electric supercharging compressor.

In addition, an electric supercharging compressor according to the invention has reduced dimensions compared to the electric supercharging compressors according to the prior art, in particular thanks to the presence of an electronic unit within the same casing as the electric motor.

In the absence of a screen, a path would be defined for the passage of pollution particles emitted at the level of the electric motor towards the electronic unit and the presence of the screen can make it possible to seal the area inside the casing. in which is placed this electronic unit vis-à-vis these pollution particles.

For the purposes of the present application, "axially" means "parallel to the axis of the driveshaft" and "radially" means "in a plane perpendicular to the axis of the driveshaft and along a straight line cutting this axis ”.

The electric supercharger according to the invention can also include one or more of the following characteristics, considered alone or in all possible combinations:

the protective screen has a generally hollow cylindrical shape, in particular with a circular base, centered on the axis of rotation of the transmission shaft of the electric motor; and / or the electronic unit is disposed at a distance from the axis of rotation greater than the distance between the axis of rotation and the protective screen; and / or the electronic unit extends axially up to a part of the screen, and / or the electric supercharging compressor also comprises an electrical connector configured to be electrically connected to the electronic unit and to the electric motor, the electrical connector comprising a through hole centered on the axis of the transmission shaft and through which extends the transmission shaft of the electric motor, a first end of the protective screen cooperates with the electrical connector; and / or the radial dimension relative to the axis of the transmission shaft of the first end of the protective screen is substantially identical to the radial dimension relative to this same axis of the through hole of the electrical connector; and / or the electric supercharger also comprises at least one position sensor configured to detect the angular position of the drive shaft of the electric motor, and a support configured to support the at least one position sensor, the support comprising a through hole centered on the axis of rotation and through which the transmission shaft of the electric motor extends; and / or the electric supercharger also comprises a bearing, for example a ball bearing, configured to guide the transmission shaft of the electric motor in rotation, and a support configured to maintain the bearing in position around the axis of rotation; and / or the screen extends axially between the bearing support and the electrical connector. In particular, the first end of the screen can be in contact with the connector while a second end of the screen is in contact with the bearing support; and / or the electric supercharger also includes a seal arranged between the first end of the protective screen and the electrical connector.

Advantageously, the protective screen having a generally hollow cylindrical shape centered on the axis of rotation allows optimum protection of the electronic unit by preventing the particles of pollution generated during the operation of the electric motor from coming into contact with the electronic unit, whatever the direction of the particles. Indeed, as the protective screen extends over 360 ° around the transmission shaft of the electric motor, this protective screen makes it possible to isolate the operating area of the electric motor from the rest of the compartment defined by the casing, and in particular of the area of this compartment comprising the electronic unit. ETn such a screen can extend exclusively axially.

Advantageously, the cooperation of the first end of the protective screen with the electrical connector allows sealing between the operating area of the electric motor and the area of the compartment defined by the casing in which the electronic unit is located.

In addition, the radial dimension relative to the axis of rotation of the first end of the protective screen substantially identical to the radial dimension relative to the axis of rotation of the through hole of the electrical connector makes it possible to have a compact electric supercharger.

A seal arranged between the first end of the protective screen and the electrical connector advantageously improves the seal between the engine operating area and the compartment area defined by the housing in which the electronic unit is located. , and therefore to prevent pollution particles from coming into contact with the electronic unit.

According to a first embodiment of the electric supercharger, the support of the position sensor (s) and the protective screen are separate. These are separate parts.

The electric supercharger according to the first embodiment of the invention may also include one or more of the following characteristics, considered alone or in all possible combinations:

the support of the position sensor (s) is arranged, in particular radially, between the transmission shaft of the electric motor and the protective screen; and / or a second end of the protective screen, called the upper end, cooperates with the bearing support; and / or the electric supercharging compressor also comprises a seal arranged between the bearing support and the second end of the protective screen.

Advantageously, the support of the position sensor or sensors disposed between the transmission shaft of the electric motor and the protective screen allows a saving of space within the electric supercharging compressor.

Advantageously, the cooperation of the second end of the protective screen with the bearing support allows sealing between the operating zone of the electric motor and the zone of the compartment defined by the casing in which is located électronique electronic unit.

In addition, a seal arranged between the bearing support and the second end of the protective screen advantageously makes it possible to improve the seal between the engine operating zone and the rest of the compartment defined by the casing, and therefore to prevent pollution particles from coming into contact with the electronic unit.

According to a second embodiment of the electric supercharger, the support and the protective screen belong to the same part.

The electric supercharging compressor according to the second embodiment of the invention may also include one or more of the following characteristics, considered alone or in all possible combinations:

the part forming the support of the position sensor (s) and the protective screen cooperates with the bearing support; and / or the electric supercharger also includes a seal arranged between the bearing support and the part forming the screen and the support of the position sensor (s).

Advantageously, the fact that the same part defines the support of the position sensor (s) and the protective screen allows a reduction in the production costs of the electric supercharging compressor according to the invention, in particular thanks to the fact that no additional part is not added to the electric supercharger.

Advantageously, the cooperation of the support of the position sensor (s) with the bearing support allows sealing between the operating zone of the electric motor and the zone of the compartment defined by the casing and in which the electronic unit is located.

In addition, a seal arranged between the bearing support and the support of the position sensor (s) advantageously improves the seal between the engine operating area and the rest of the compartment defined by the casing, and by Therefore prevent pollution particles from coming into contact with the electronic unit.

In all of the above, the electronic unit can be an electronic power unit, belonging to a static converter or forming such a converter. The converter is for example a DC / DC voltage converter, or a DC / alternative voltage converter, also called an "inverter".

Other characteristics and advantages of the present invention will appear on reading the following description and figures:

FIG. 1 is a schematic view of an electric supercharger according to a first embodiment of the invention, FIG. 2 is a schematic view of an electric supercharger according to a second embodiment of the invention, Figure 3 is a sectional view of an electric supercharger according to the first embodiment of the invention, Figure 4 is a sectional view of an electric supercharger according to the second embodiment of the FIG. 5 is a sectional view of a protective screen of an electric supercharging compressor according to the first embodiment of the invention, FIG. 6 is a perspective view of a support for a compressor supercharging according to the second embodiment of the invention, and Figure 7 is a sectional view of a support of an electric supercharging compressor the second embodiment of the invention.

It should be noted that these drawings have no other purpose than to illustrate the text of the description and do not in any way constitute a limitation of the scope of the invention.

In the various figures, similar elements are designated by identical references. In addition, the different elements are not necessarily shown to scale in order to present a view making it easier to understand the invention.

The invention relates to an electric supercharging compressor, in particular configured to be installed in a vehicle to compress the intake gases of the vehicle combustion engine.

Embodiments of an electric supercharger according to the invention are shown in Figures 1 to 4.

The electric supercharging compressor 10 comprises a casing 20, in which an electric motor 30, a wheel 40 and an electronic unit 50 are arranged.

The electronic unit arranged within the same casing as the electric motor allows a reduction in the dimensions of the electric supercharging compressor.

The electric motor 30 comprises a transmission shaft 32 having a rotational movement around an axis of rotation A.

The wheel 40 is driven in rotation about the axis of rotation A by the transmission shaft 32 of the electric motor 30. The wheel 40 comprises blades which are driven in rotation around the axis of rotation A so as to compress the air. In FIGS. 1 to 4, the wheel 40 and the electric motor 30 are arranged at opposite axial ends of the compartment defined by the casing 20.

In particular, the electric motor 30 is coupled to the wheel 40 so as to form an electric machine.

The electronic unit 50 can be an electronic control unit or an electronic power unit. An electronic power unit, for example one or a plurality of electronic power modules, is configured to supply power to the electric motor. An electronic control unit, for example an electronic control card, is configured to control the electronic power unit. For example, two electronic power units 50 are shown in FIGS. 1 to 4.

The electronic unit 50 is arranged in a zone of the compartment defined by the casing 20 located at a distance from the above-mentioned axial ends, that is to say that the electric motor 30, the electronic unit 50 and the wheel 40 follow one another in this order along the axis of rotation A in Figures 1 to 4.

The electronic unit 50 comprises a face facing the wheel 40 and a face facing the electric motor 30. A power electronic unit comprises a plurality of electronic components, and in particular connection elements intended to electrically connect the electronic unit to electrical elements external to the electronic unit, for example to another electronic unit or to an electrical connector.

The electric supercharging compressor 10 comprises, in the same casing 20 comprising the electric motor 30, the electronic unit 50 and the wheel 40, a protective screen 60. The protective screen 60 is disposed at least partially between the shaft 32 and the electronic unit 50.

The protective screen 60 makes it possible to isolate the operating zone of the electric motor from the zone of the compartment defined by the casing 20 in which the electronic unit 50 is located, that is to say that this screen allows isolate the area between the electric motor and the wheel which is near the electric motor drive shaft.

As shown in FIGS. 1 to 4, the protective screen 60 extends longitudinally along the axis of rotation A around the transmission shaft 32 and over a height greater than the dimension of the electronic unit 50.

The protective screen can be made of electrically insulating material, for example plastic material.

As shown in particular in FIG. 6, the protective screen can have a generally hollow cylindrical shape, in particular with a circular base, centered on the axis of rotation A. In other words, the protective screen can extend over 360 ° around the transmission shaft 32 of the electric motor 30.

A first end 62 of the protective screen 60 is located opposite the zone of the compartment defined by the casing 20 in which the electric motor 30 is disposed. A second end 64 of the protective screen 60 is located opposite the zone of the compartment defined by the casing 20 in which the wheel 40 is arranged.

The electronic unit 50 can be placed at a distance from the axis of rotation A greater than the distance between the axis of rotation A and the protective screen 60. In other words, the electronic unit 50, a portion of the the protective screen 60 and the transmission shaft 32 of the electric motor are aligned in this order, radially speaking.

Advantageously, the protective screen allows optimal protection of the electronic unit, by preventing particles of pollution generated during the operation of the electric motor from coming into contact with the electronic unit, regardless of the direction of the particles. Indeed, the protective screen 60 extending all around the transmission shaft 32, and the electronic unit 50 being located at a distance from the axis of rotation greater than the distance between the axis of rotation A and the protective screen 60, the pollution particles cannot bypass the protective screen and therefore come into contact with the electronic unit.

The electric supercharging compressor 10 can comprise, in the same casing 20 containing the electric motor 30, the electronic unit 50 and the wheel 40 and the protective screen 60, an electric connector 70. An electric connector 70, also called bar electrical connection, is configured to be electrically connected to the electronic unit 50 and to the electric machine, and more precisely to the electric motor 30.

The electrical connector 70 includes a through hole 72, delimited by a wall, centered on the axis of rotation A and through which extends the transmission shaft 32 of the electric motor 30.

The electrical connector 70 is arranged at a distance from the axial ends of the compartment defined by the casing 20. More specifically, the electrical connector 70 is axially disposed between the electronic unit 50 and the electric motor 30. The electric motor 30, the electric connector 70 , the electronic unit 50 and the wheel 40 follow one another in this order along the axis of rotation A.

In particular, the first end 62 of the protective screen 60 can cooperate with the electrical connector 70.

Advantageously, the cooperation of the protective screen with the electrical connector allows a seal between the operating zone of the electric motor and the zone of the compartment defined by the casing in which is located électronique electronic unit 50.

Indeed, the electronic unit 50 being disposed at a radial distance from the axis of rotation A greater than the distance between the protective screen 60 and the transmission shaft 32 of the electric motor 30, the cooperation of the first end 62 of the protective screen 60 and of the electrical connector 70 makes it possible to isolate this electronic unit 50 from the operating zone of the electric motor.

The electric supercharger can include a seal (not shown) disposed between the first end 62 of the shield 60 and the electrical connector 70. The seal can be an air seal.

Advantageously, the seal makes it possible to improve the seal between the operating area of the engine and the area of the compartment defined by the casing in which the electronic unit is disposed, and consequently to prevent particles from pollution from coming into contact with the electronic unit.

The radial dimension with respect to rotation tax A of the first end 62 of the protective screen 60 may be substantially identical to the radial dimension with respect to rotation tax A of the through orifice 72 of the electrical connector 70. In other words , the protective screen 60 extends longitudinally according to the rotation tax A substantially in the extension of the wall delimiting the through orifice 72 of the electrical connector 70. More specifically, the first end 62 of the protective screen 60 rests on the part of the electrical connector 70 which is the furthest from Rotation tax A.

Advantageously, this configuration allows a compactness of the electric supercharging compressor.

The electric supercharger can comprise at least one position sensor 80 configured to detect the angular position of the drive shaft 32 of the electric motor 30. The position sensor 80 can be a magnetic sensor, for example a Hall effect sensor. . The position sensor 80 is arranged here axially speaking close to the wheel 40. In particular, the position sensor 80 is arranged so as to extend in the vicinity of the rotation shaft 32 of the electric motor 30. In particular, at at least a portion of the position sensor 80 extends opposite the rotation shaft 32 so as to detect an angular position of the transmission shaft 32 of the electric motor 30.

The electric supercharging compressor may include a support 82 configured to support the position sensors 80. The support 82 includes a through hole centered on the axis of rotation A and through which extends the transmission shaft 32 of the electric motor 30. The support 82 is arranged here elsewhere than in the zone of the compartment defined by the casing in which the electric motor 30 is arranged.

The electric supercharger can comprise a bearing, such as a ball bearing 90, configured to guide the transmission shaft 32 of the electric motor 30 in rotation about the axis of rotation A. The ball bearing 90 comprises a through hole 92 centered on the axis of rotation A and through which extends the transmission shaft 32 of the electric motor 30. The ball bearing 90 is disposed near an axial end of the compartment defined by the casing 20 More precisely, the ball bearing 90 is arranged between the support 82 and the wheel 40. The electric motor 30, the support 82, the ball bearing 90 and the wheel 40 follow one another in this order along the axis of rotation A.

The ball bearing 90 is pre-mounted around the axis of rotation A so that the dimensioning of the ball bearing 90 conditions the dimensions of the through hole of the electrical connector 70 and of the first end of the protective screen 60

The electric supercharging compressor may comprise a support 94 configured to maintain the bearing 90 in position around the axis of rotation A. The support 94 includes a through hole 96 centered on the axis of rotation A and through which extends the transmission shaft 32 of the electric motor 30. The support 94 is disposed between the support 82 of the position sensors 80 and the ball bearing 90. The electric motor 30, the support 82, the part 94, the ball bearing 90 and the wheel 40 follow one another in this order along the axis of rotation A.

According to a first embodiment of the invention notably shown in Figures 1 and 3, the support 82 of the position sensors 80 and the protective screen 60 are separate.

FIG. 5 represents a sectional view of a protective screen according to the first embodiment of the invention.

The support 82 of the position sensors 80 is arranged radially between the transmission shaft 32 of the electric motor 30 and the protective screen 60. In other words, the support 82 is arranged in the generally hollow cylindrical shape of the protective screen 60.

Advantageously, such a support arranged between the transmission shaft of the electric motor and the protective screen allows a saving of space within the electric supercharging compressor.

The second end 64 of the protective screen 60 cooperates with the bearing support 94. More specifically, the protective screen 60 extends axially along the axis of rotation A between the electrical connector 70 and this support 94. The screen here extends exclusively axially between the electrical connector 70 and the support 94 .

Advantageously, the cooperation of the second end of the protective screen with the support allows sealing between the operating zone of the electric motor and the zone defined by the casing 20 in which the electronic unit 50 is disposed.

Indeed, the electronic unit 50 being arranged at a radial distance from the axis of rotation A greater than the distance between the protective screen 60 and the transmission shaft 32 of the electric motor 30, the cooperation of the second end 64 of the protective screen 60 and of the bearing support 94 makes it possible to isolate the area of the compartment defined by the casing 20 in which the electronic unit 50 is disposed from the operating area of the electric motor.

The electric supercharging compressor may comprise a seal (not shown) arranged between the bearing support 94 and the first end 62 of the protective screen 60.

Advantageously, the seal makes it possible to improve the seal between the zone of the compartment defined by the casing in which the electronic unit 50 is disposed and the operating zone of the engine, and consequently to prevent particles of pollution. to come into contact with the electronic unit.

According to a second embodiment of the invention notably shown in Figures 2 and 3, the support 82 of the position sensors and the protective screen 60 belong to one and the same part. This part is here in one piece.

The second end 64 of the protective screen 60 is connected to the support 82 of the position sensors 80. In other words, the protective screen 60 extends longitudinally along the axis of rotation A from a portion of the support 82 of sensors position 80.

The second embodiment allows a reduction in the production costs of the electric supercharger, in particular thanks to the fact that no additional part is added to the electric supercharger.

Figures 6 and 7 respectively represent a perspective view and in section of a support comprising a protective screen according to the second embodiment of Γinvention.

As visible in FIG. 6, the support 82 carries three position sensors

80.

The part defining the support 82 of the position sensors 80 and the screen 60 cooperates with the support 94 for the bearing 90. More specifically, the end 84 of this part most distant from the first end of the screen 60 which comes in contact with the electrical connector 70 co-operates with the support 94 for the bearing 90. This part extends axially between the support 94 for the bearing 90 and the electrical connector 70.

Advantageously, the cooperation of the part forming the support for position sensors and the protective screen with the bearing support allows sealing between the area defined by the housing in which the electronic unit is located and the engine operating area. electric.

Indeed, the electronic unit 50 being disposed at a radial distance from the axis of rotation A greater than the distance between the protective screen 60 and the transmission shaft 32 of the electric motor 30, the cooperation between the end 84 of the part and the bearing support 94 makes it possible to isolate the intermediate part of the casing 20 from the operating zone of the electric motor.

The electric supercharging compressor may include a seal (not shown) disposed between the bearing support 94 and the support 82 for position sensors 80, and more precisely between the bearing support 94 and the end 84 of the part. forming the support 82 of position sensors and the protective screen 60.

Advantageously, the seal makes it possible to improve the seal between the zone defined by the casing in which the electronic unit 50 is located and the operating zone of the engine, and consequently to prevent particles of pollution from coming in contact with the electronic unit.

In an electric supercharging compressor according to the first or second embodiment of the invention which have just been described, the pollution particles generated during the operation of the electric motor are thus trapped between the electric motor 30, the electric connector 70 , the protective screen 60 and the bearing support 94. In other words, the configuration of the electric motor 30, the electrical connector 70, the protective screen 60 and the bearing support 94 makes it possible to prevent particles from pollution from coming into contact with the electronic unit, and therefore avoids possible short circuits within the electric supercharger

The electric supercharger according to the invention has been described in the context of a motor vehicle. Of course, the invention is in no way limited to the embodiments described and illustrated, which have been given only by way of examples. On the contrary, other applications of the electric supercharging compressor according to the invention are also possible without departing from the scope of the invention.

Claims (10)

1. Electric supercharging compressor (10) in particular for a motor vehicle, comprising in the same casing (20): an electric motor (30) comprising a transmission shaft (32) having a rotational movement about an axis of rotation (A), a wheel (40) driven in rotation by the transmission shaft (32) of the electric motor (30), an electronic unit (50) for supplying power and / or controlling the electric motor (30), characterized in that the electric supercharging compressor (30) also comprises: a protective screen (60) disposed at least partially between the transmission shaft (32) and the electronic unit (50). 2. An electric supercharger according to claim 1, in which the protective screen (60) has a generally hollow cylindrical shape, in particular with a circular base, centered on the axis of rotation (A) of the transmission shaft ( 32) of the electric motor (30). 3. Electric supercharger according to one of the preceding claims, also comprising: an electrical connector (70) configured to be electrically connected to the electronic unit (50) and the electric motor (30), the electrical connector (70) comprising a through hole (72) centered on the axis of rotation (A) and through which the transmission shaft (32) of the electric motor (30) extends, and in which a first end (62) of the protective screen (60) cooperates with the electric connector (70). 4. Electric supercharger according to the preceding claim, wherein the radial dimension relative to the axis of rotation (A) of the first end (62) of the protective screen (60) is substantially identical to the radial dimension relative to the axis of rotation (A) of the through hole (72) of the electrical connector (70). 5. Electric supercharger according to one of the preceding claims, also comprising: at least one position sensor (80) configured to detect the angular position of the transmission shaft (32) of the electric motor (30), and 5 - a support (82) configured to support the at least one position sensor (80), the support (82) comprising a through hole (84) centered on the axis of rotation (A) and through which extends the drive shaft (32) of the electric motor (30). 6. Electric supercharger according to the preceding claim, 10 in which the support (82) and the protective screen (60) are separate, the support (82) being disposed between the drive shaft (32) of the electric motor (30) and the protective screen (60 ). 7. Electric supercharger according to the preceding claim, also comprising: 15 - a bearing (90), in particular a ball bearing (90), configured to guide the transmission shaft (32) of the electric motor (30) in rotation, and a support (94) configured to hold the ball bearing (90) in position around the axis of rotation (A), 20 and in which a second end (64) of the protective screen (60) cooperates with the support (94). 8. An electric supercharger according to claim 5, in which the support (82) of the position sensor (s) (80) and the protective screen (60) belong to the same part. 25 9. Electric supercharger according to the preceding claim, also comprising: a bearing (90), in particular a ball bearing (90), configured to guide the transmission shaft (32) of the electric motor (30) in rotation, and a support (94) configured to maintain the ball bearing (90 ) in position 5 around the axis of rotation (A), and in which the part forming the support (82) of the position sensor (s) (80) and the protective screen (60) cooperates with the support (94 ) bearing (90). 10. Electric supercharger according to one of the preceding claims, comprising at least one seal placed at the water level. 10 minus one end (62, 64) of the protective screen (60). . 1/4