FR3042551A1 - ELECTRIC COMPRESSOR - Google Patents

Abstract

The present invention relates to an electric compressor 1 comprising at least one compressor wheel 3 driven by an electric motor assembly 2 controlled by an electronic assembly 9, and having a housing 11, 113, 114, 115 of protection arranged on the electric motor assembly 2 and the electronic assembly 9.

Description

ELECTRIC COMPRESSOR

The present invention relates to the field of electric compressors, and more particularly to an electric supercharger for a motor vehicle.

In the context of the invention, an electric compressor is a device used to supercharge a heat engine, operating with an electric motor driving a compressor wheel and having an electronic assembly.

The electric compressor is placed on the air intake line of an internal combustion engine. The electric compressor plays the same role as a turbocharger, namely increase the intake pressure of the fresh gases in the engine, but is used in particular during transient phases to overcome turbocharger response time problems.

A compressor comprises at least one electric motor driving a wheel, controlled by an electronic assembly. All of these elements that the compressor to a size large enough that may hinder its integration into the engine, for example a vehicle.

There is therefore a need today to reduce the dimensions of such an electric compressor.

The present invention therefore aims to overcome one or more of the disadvantages of the devices of the prior art by providing an electric compressor whose external dimensions are improved, thus optimizing the size of the compressor and therefore its use.

For this, the present invention provides an electric compressor comprising at least one compressor wheel driven by an electric motor assembly controlled by an electronic assembly, and having a protective housing disposed on the electric motor assembly and the electronic assembly. 2

According to one embodiment of the invention, the housing is fixed at the junction between the volute and the motor housing, by any fastening means.

According to one embodiment of the invention, the compressor housing is formed by at least one generally cylinder-shaped portion extending the wheel along a shaft of the compressor.

According to one embodiment of the invention, an end of the casing disposed on the opposite side to that of the wheel has a diameter d1 smaller than the diameter d2 of the end of the casing disposed on the side of the wheel.

According to one embodiment of the invention, an end of the housing opposite the wheel forms a housing configured to receive an electric motor of the compressor.

According to one embodiment of the invention, a part of the housing disposed against the rear of the wheel comprises at least a first outer housing configured to receive the capabilities of the electronic assembly.

According to one embodiment of the invention, the part of the housing disposed against the rear of the wheel comprises a second outer housing configured to receive another part of the electronic assembly.

According to one embodiment of the invention, the part of the housing disposed against the rear of the wheel comprises a third housing configured to receive another part of the electronic assembly.

According to one embodiment of the invention, the three housings are arranged around the shaft, on the same plane perpendicular to that of the shaft.

According to one embodiment of the invention, the electric motor is a permanent magnet motor. The invention also relates to the use of the electric compressor according to the invention in a combustion engine.

According to one embodiment of the invention, the engine is an internal combustion engine or a fuel cell engine. Other objects, features and advantages of the invention will be better understood and will appear more clearly on reading the description given hereinafter with reference to the appended figures given by way of example and in which: FIG. 1 is a diagrammatic representation in section showing an electric compressor according to the invention; FIG. 2 is a representation of a profile view of an electric compressor according to the invention; FIG. 3 is a representation of FIG. Another side view of an electric compressor according to the invention, - Figure 4 is a representation of a bottom view of an electric compressor according to the invention, - Figure 5 is a representation of a view of above an electric compressor according to the invention.

The present invention relates to an electric compressor 1.

In the context of the invention, the term electric compressor 1, an air compressor, volumetric or not and for example centrifugal or radial, driven by an electric motor, for the purpose of supercharging a heat engine. According to one embodiment of the invention, the electric motor is an asynchronous DC or AC motor, or any type of electric motor of the same type.

More specifically, according to one embodiment of the invention, the electric motor is a variable reluctance motor (also called SRM machine for Switched Reluctance Motor according to English terminology).

According to another embodiment of the invention, the motor is a permanent magnet motor.

Figure 1 illustrates an example of an electric compressor 1. The electric compressor 1 comprises at least one electric motor assembly 2, and a compressor wheel 3. The electric motor assembly comprises a housing 4 or envelope 4 motor in which is disposed, inside, an electric motor 5. The electric motor 5 comprises at least one rotor and a stator. The electric motor 5 allows the rotation of a shaft 6 of the electric compressor via bearings 7. The shaft 6 thus rotates the wheel 3 of the compressor 1. More precisely one end of the shaft 6 is rotated. by the electric motor, and another end of the shaft 6 rotates the wheel 3 of the compressor.

According to one embodiment of the invention, the compressor 1 comprises an electronic assembly 9 for controlling the electric compressor 1. The term "electronic assembly 9" refers to the power and / or control electronics, and for example the electronic card, the filtering components (inductances, etc.), the capacitors, the power modules, etc.

According to one embodiment of the invention, the electronic assembly 9 is disposed outside the motor assembly 2. More precisely, according to one embodiment of the invention, the electronic assembly is arranged at the outside the motor housing.

According to one embodiment of the invention, the electronic assembly is disposed inside the motor assembly.

According to one embodiment of the invention, the electronic assembly is disposed between the rear of the wheel and the electric motor or the motor housing.

According to one embodiment of the invention, the electronic assembly 9 is arranged around the electric motor, coaxially with respect to the shaft 6 of the compressor. The electronic assembly 9 is thus arranged all around the motor assembly 2 at the height of the electric motor 5 along the axis of the shaft 6. More precisely, the electronic assembly 9 is arranged on the motor housing 4 in a plane perpendicular to the axis of the shaft 6.

According to one embodiment of the invention, at least a portion of the motor assembly 2 is disposed between the rear 31 of the wheel 3 and the electronic assembly 9. The rear 31 of the compressor wheel corresponding to the face, of the wheel, directed towards the electric motor.

According to one embodiment of the invention, the motor assembly 2 forms a cover which covers the rear of the wheel 3 of the compressor 1. The diameter 22 of the motor assembly 2 at the wheel 3 is greater than the diameter 21 of the engine assembly at its opposite end. According to one embodiment of the invention, the motor housing 4 forms a T. The electronic assembly is disposed above the housing 4, as opposed to the level of the largest diameter 22, and surrounds the housing 4 at the diameter the smallest 21.

The electric compressor 1 also comprises a cooling circuit 10.

According to one embodiment of the invention, the cooling circuit 10 is disposed inside the motor housing 4. More specifically, the cooling circuit 10 is disposed at the rear 31 of the wheel 3 of the compressor, that is to say at the rear face of the wheel 3.

According to one embodiment of the invention, the cooling circuit is disposed in the rear part of the wheel, and more precisely in the rear plate of the wheel.

The cooling circuit 10 is thus disposed at most rock of the electronic assembly 9. More precisely, the cooling circuit 10 is disposed between the rear of the wheel 31 and the electronic assembly 9.

Such a configuration optimizes the cooling of the electronic assembly and reduces the size of the compressor.

According to one embodiment of the invention, the interior of the motor housing 4 is configured to support the bearings. That is, the bearings are attached to the interior of the housing 4.

According to one embodiment of the invention, the compressor 1 comprises an inverted volute 12 allowing the passage of the air compressor 1. The wheel 3 of the compressor is disposed in the volute 12.

According to one embodiment of the invention, the wheel of the compressor 1 is a paddle wheel.

According to one embodiment of the invention, the compressor 1 comprises a cover or housing 11 of protection disposed on the electric motor assembly 2 and the electronic assembly 9. The cover is mounted on the housing 4 electric motor.

According to one embodiment of the invention, the cover or housing 11 is fixed at the junction between the volute and the motor housing, by any fastening means such as for example screwing, welding or gluing.

In the context of the invention illustrated in FIGS. 2 to 5, the casing 11 of the compressor is formed by at least one part.

According to one embodiment, the housing 11 is formed by 2, 3 or 4 parts.

In the context of the invention, the housing 11 has the general shape of a cylinder extending the wheel 3 along the shaft 6.

According to one embodiment of the invention, the housing 11 has a diameter equivalent to that of the wheel 3 of the compressor.

According to one embodiment of the invention, the housing 11 has a general diameter identical to that of the wheel 3 of the compressor.

According to one embodiment of the invention, the end 111 of the housing 11 disposed on the opposite side to that of the wheel has a diameter d1 smaller than the diameter d2 of the end 112 of the housing 11 disposed on the side of the wheel 3.

Such a compressor is thus more compact and less bulky.

This end 111 of the housing opposite the wheel forms a housing configured to receive the electric motor 5 of the compressor. This end 111 opposite the wheel forms a housing for the electric motor 5. This housing has the shape of a cylinder.

According to one embodiment of the invention, the portion 112 of the housing 11 disposed against the rear of the wheel 3, comprises at least one shape, and for example an embossing-type shape to the outside. More precisely, this shape is a protrusion of the housing. This shape is configured to receive at least a portion of the electronics disposed in the compressor housing. This form is an outer housing for at least a portion of the electronic assembly 9.

According to one embodiment of the invention, a first housing 113 outside the portion 112 of the housing 11 is configured to receive the capabilities of the electronic assembly 9. According to one embodiment of the invention, this first housing 113 has a circular or oval cylinder shape, or any other form adapted to receive the capabilities.

According to one embodiment of the invention, the first housing 113 is formed on one side of the housing, parallel to the axis of the shaft 6 of the compressor. More specifically, the first housing 113 is disposed on the portion 112 of the housing disposed on the side of the wheel 3 and protrudes at the portion 111 of the housing 11 disposed opposite the wheel 3.

According to one embodiment of the invention, a second housing 114 outside the portion 112 of the housing 11 is configured to receive another portion of the electronic assembly 9. According to one embodiment of the invention, the second housing 114 has a square or rectangular parallelepiped shape on 5 sides. The sixth side being integrated in the housing 11. This second housing 114 to any form adapted to receive at least a portion of the electronics.

According to one embodiment, the second housing 114 is formed on one side of the housing, parallel to the axis of the shaft 6 of the compressor. More specifically, the second housing 114 is disposed on the portion 112 of the housing disposed on the side of the wheel 3.

According to one embodiment of the invention, a third housing 115 outside the portion 112 of the housing 11 is configured to receive another portion of the electronic assembly 9. According to one embodiment of the invention, the third housing 115 has a square or rectangular parallelepiped shape on 5 sides. The sixth side being integrated in the housing 11. This third housing 115 to any form adapted to receive at least another part of the electronics.

According to one embodiment, the third housing 115 is disposed on one side of the housing, parallel to the axis of the shaft 6 of the compressor. More specifically, the third housing 115 is disposed on the portion 112 of the housing disposed on the side of the wheel 3.

This or these housing allows the housing to be adapted to the shape of the electronic assembly and motor and thus allow the compressor to have a reduced size, and reduce its size.

According to one embodiment of the invention, the three housings are arranged around the shaft 6, on the same plane perpendicular to that of the shaft 6.

According to one embodiment of the invention, the second 114 and third 115 housings are arranged on either side of the first housing 113.

According to one embodiment of the invention the first 113 and second housing 114 forms an angle A less than 45 degrees.

According to one embodiment of the invention the first 113 and third housing 115 forms an angle B less than 45 degrees.

According to one embodiment of the invention, the surface 121 of intersection between the first portion 111 of the housing and the second portion of the housing 112, comprises at least one connector 131 and for example a power connector or signal.

According to one embodiment of the invention, the surface 121 comprises a second connector 132 and for example a power or signal connector.

According to one embodiment of the invention, the inside of the housing 11 is configured to support the electronic assembly 9. That is to say that the electronics is fixed inside the housing.

According to one embodiment of the invention, the housing is made of plastic or aluminum, or any other material compatible with the use of the compressor 1.

According to one embodiment of the invention, the compressor comprises a position sensor disposed inside the housing 11, either between the electric motor and the wheel, or at the end of the motor opposite to the wheel.

A compressor according to the invention is used in a combustion engine, and for example an internal combustion engine or fuel cell.

The scope of the present invention is not limited to the details given above and allows embodiments in many other specific forms without departing from the scope of the invention. Therefore, the present embodiments should be considered by way of illustration, and may be modified without departing from the scope defined by the claims.

Claims (11)

Electric compressor (1) comprising at least one compressor wheel (3) driven by an electric motor assembly (2) controlled by an electronic assembly (9), and having a protective housing (11) disposed on the motor assembly electric (2) and the electronic assembly (9). 2. Electric compressor (1) according to claim 1, wherein housing (11) is fixed at the junction between the volute and the motor housing, by any fastening means. 3. Electric compressor (1) according to one of claims 1 to 2, wherein the housing (11) of the compressor is formed by at least one generally cylindrical portion extending the wheel (3) along a shaft (6). ) of the compressor (1). 4. Electric compressor (1) according to one of claims 1 or 3, wherein one end (111) of the housing (11) disposed on the side opposite to that of the wheel has a diameter dl less than the diameter d2 of the end ( 112) of the housing (11) disposed on the side of the wheel 3. 5. The electric compressor 1 according to one of claims 1 or 4, wherein an end 111 of the housing opposite the wheel forms a housing configured to receive an electric motor 5 of the compressor. 6. Electric compressor (1) according to one of claims 1 to 5, wherein a portion (112) of the housing (11) disposed against the rear of the wheel (3), comprises at least a first housing (113) outside configured to receive the capabilities of the electronic assembly 9. The electric compressor 1 according to claim 6, wherein the portion (112) of the housing (11) disposed against the rear of the wheel (3) has a second outer housing (114) configured to receive another portion of the electronic assembly (9). 8. Electric compressor (1) according to one of claims 6 to 7, wherein the portion (112) of the housing (11) disposed against the rear of the wheel (3) comprises a third housing (115) configured to receive another part of the electronic assembly (9). 9. Electric compressor (1) according to one of claims 6 to 8, wherein the three housings are arranged around the shaft (6), on the same plane perpendicular to that of the shaft (6). Electric compressor according to one of claims 1 to 9, wherein the electric motor is a permanent magnet motor. 11. Use of the electric compressor according to one of the preceding claims in a combustion engine.