FR3034919A1 - ELECTRIC MOTOR, AIR PULSE DEVICE AND HEATING AND / OR AIR CONDITIONING VENTILATION SYSTEM EQUIPPED WITH SUCH ENGINE - Google Patents

Abstract

The invention relates to an electric motor for an air-blast device comprising at least one stator (2), a rotor (3), a support element (9) of said rotor (3) and said stator (2). , a radiator (8) for an electronic member, characterized in that the support element (9) of said rotor (3) and of said stator (2) and the radiator (8) are a same piece (30) said to be bi-functional said bifunctional part (30) further comprising additional heat dissipation means (50).

Description

FIELD OF THE INVENTION The present invention relates to the field of electric motors. The present invention relates more particularly, but not exclusively, to an electric motor used in an air supply device. An air supply device equipped with an electric motor according to the invention is, for example, used in a ventilation system, heating and / or air conditioning of a motor vehicle. An electric motor is generally based on the interaction of a rotor with a stator, said rotor and said stator being mounted independently of one another in said motor. As a result, such a motor has the disadvantage of not guaranteeing good coaxiality between the rotor and the stator (ie that the rotor and the stator must be coaxially disposed relative to one another. to the other). However, a bad coaxiality between these two elements can lead to risks of malfunction of the engine, such as alternating phases of acceleration and slowdown phases. Thus, an electric motor according to the invention makes it possible to ensure a more homogeneous and regular operation of the electric motor, and thus to avoid a speed of rotation by jerks of the rotor around the stator.

The present invention thus relates to an electric motor for an air-blower device comprising at least one stator, a rotor, a support element for said rotor and said stator, a radiator for an electronic element, characterized in that the element support of said rotor and said stator and the radiator are a same so-called bi-functional part, said bi-functional part further comprising additional means of heat dissipation. The term "bi-functional" means that the part fulfills at least a first support function for the rotor and the stator, and at least a second cooling function of the motor, and / or, for example, an electronic disposed on said piece. Thus, said bi-functional piece is monobloc. The fact that said bi-functional part is in one piece (or monobloc) 5 makes it possible to overcome the need to have to position a radiator with respect to a support element in said motor. Thus, when said bi-functional part is, for example, positioned between an electronic member and the engine support, the radiator will automatically contribute to the correct positioning of the rotor and stator support element and therefore to a coaxial mounting of said rotor and said stator. The fact that the relative position between the radiator and the support element is fixed is advantageous, because it makes it possible not to have, at the motor, to position a radiator with respect to a support element.

Although constituting the same room, the radiator and the support member may be made of the same or different materials. According to one possible characteristic, the rotor is arranged around the stator.

According to another possible characteristic, the motor comprises a motor support traversed by a fluid flow. According to another possible characteristic, the motor comprises an electronic member adapted to drive said motor. Said electronic member is, for example, an electronic card which controls the operation of said electric motor. According to another possible characteristic, the engine comprises the radiator part of said bi-functional part is inserted between said motor support and said electronic member. According to another possible feature, the bi-functional part 30 comprises a base serving as radiator. In this way, the radiator can provide effective cooling over an extended area, while occupying a small space due to its small thickness.

According to another possible characteristic, said additional heat dissipation means is located on the base of said bifunctional part. Said additional heat dissipation means makes it possible to improve the thermal dissipation performance of the base of said bi-functional part. This is particularly advantageous when the engine is operating over a long period of time and / or when the ambient temperature is high. According to another possible characteristic, said base extends in a plane which is perpendicular to the axis of revolution of the internal channel of the hollow part. According to another possible characteristic, the base of the bifunctional part is placed in contact with the motor support and the electronic member, so that the flow of fluid passing through the engine support cools the radiator and said radiator cools. said electronic member. The radiator has the function of absorbing the heat emitted by the electronic member and then discharging this heat through the fluid from the flow of fluid passing through the motor support. According to another possible characteristic, the bi-functional part 20 comprises a hollow part comprising an internal channel which acts as a support element for the rotor and the stator. Said hollow portion is for example of tubular form. On the other hand, the inner channel preferably has a circular section, but may also have an elliptical section or the like.

According to another possible characteristic, the stator is arranged around the hollow part while being in contact with the external surface of said hollow part, and in that the internal channel is able to receive a central axis of the rotor, said rotor being positioned around said stator. According to another possible feature, characterized in that said additional heat dissipation means has an angle between 600 and 900 with respect to the main extension plane of the base. The fact that the additional heat dissipation means has an inclination of between 60 ° and 90 ° relative to the main extension plane of the base makes it possible, for example, to promote a heat exchange between the said additional means and a flow. of incident air. According to another possible characteristic, said additional heat dissipation means comprises one or more fins 10 and / or one or more pins. According to another possible characteristic, said additional heat dissipation means and said bi-functional part are one piece. The fact that said additional heat dissipation means and said bi-functional part is in one piece (or monoblock) makes it possible, for example, to avoid a step of mounting said additional means on said bi-functional part. . According to another possible feature, the base has a disc shape. The disc shape of the base is particularly advantageous because it does not have protruding parts that can damage neighboring elements or an operator when mounting said motor. Note however that the base can have any shape such as rectangular, square, elliptical ... According to another possible feature, the hollow portion houses bearings. Said bearings accommodate the central axis of said rotor.

Said bearings are, for example, ball bearings, roller bearings, needle bearings, etc. According to another possible characteristic, the motor support has at least one passage to the motor to allow the flow of fluid passing through said support. to flow to said engine for cooling.

According to another possible characteristic, the bi-functional piece is made of metal. Thus, the base serving as a radiator can effectively cool the electronic member by thermal conduction. In addition, the fact that the bi-functional part is made of metal makes it possible to block electromagnetic radiation emitted by the electronic element, these electromagnetic radiations being able to disturb the operation of the electric motor. In addition, the fact that the bi-functional part is made of metal makes it easy to connect the stator to ground via said bi-functional part. According to another possible feature, the bi-functional part is aluminum. In this way, the functional part is, on the one hand, light and, on the other hand, a good thermal conductor. More particularly, the stator is disposed around the hollow portion while being in contact with the outer surface of said portion, the inner channel being adapted to receive a central axis of the rotor. Thus, for this positioning, the rotor rotates around the stator. Preferably, the motor support comprises at least one passage to the motor to allow the flow of fluid passing through said support to pass to said motor to cool it. Thus, the flow of fluid passing through the engine support serves both to cool the radiator and the hot areas of the engine. Said hot zones are, for example, located on the rotor and on the stator. According to another possible characteristic, the flow of fluid 25 passing through said engine support is at least one of the following fluids: air, water, a refrigerant (for example R134A, HFO 1234 YF, The second object of the invention is a bi-functional piece capable of providing the functions of radiator and rotor and stator support 30 in an engine according to the invention as previously described. (When said bi-functional part is mounted in said engine).

The third object of the invention is an air pumping device comprising at least one electric motor according to the invention as described above. According to a possible characteristic, the air-blowing device 5 according to the invention comprises at least one ventilation wheel cooperating with said at least one electric motor. An air delivery device according to the invention has the advantage that it can be manufactured more quickly and more simply, because the radiator and the rotor and stator support member are one and the same. Indeed, such a part is manufactured in a single operation, while two separate parts require two manufacturing processes. Such a device also has the advantage of being able to be mounted more easily, in fact the precise positioning of a single piece in said device is always easier to achieve than that of two separate parts. It finally has the advantage of being more homogeneous and more reliable operation, ensuring a more rigorous and more precise coaxiality between the rotor and the stator of the electric motor. The fourth subject of the invention is a heating, ventilation and / or air conditioning system comprising at least one air-blowing device according to the invention as described above. The invention, in its general and particular aspects, will be better understood, and other objects, details, features and advantages thereof will become more clearly apparent in the following description of particular embodiments of the invention, FIG. 1 is a diagrammatic cross-sectional view of an air-blower device equipped with an electric motor according to the invention; FIG. FIG. 2 is a perspective view of an electric motor and a bi-functional part of the air-throwing device of FIG. 1; Figure 3 is a perspective and exploded view of an air pumping device of Figure 1; - Figure 4 is a perspective view of a bifunctional part according to a possible embodiment of the invention; FIG. 5 is a semi-diagrammatic sectional view of an air pumping device equipped with an electric motor according to the invention. Figure 1 is a schematic sectional view of an air supply device 100 equipped with an electric motor 101 according to the invention.

The electric motor 101 comprises a stator 2 and a rotor 3, a motor support 5, an electronic member 7 adapted to drive said motor, a radiator 8, a support element 9 of said rotor 3 and said stator 2. The electric motor 101 comprises at least one circulation channel of a fluid flow 10, for example an air flow, allowing the cooling of said engine 101. Thus, in the embodiment shown, said electric motor 101 is traversed by a flow of fluid. 'air. It will be noted, however, that the fluid cooling the electric motor 101 may be a gas, a liquid or two-phase gas-liquid mixture. The fluid is, for example, water or a refrigerant (such as R134A, HFO 1234 YF, carbon dioxide, etc.). The air delivery device 100 comprises at least one electric motor. 101 and at least one ventilation wheel 4 which cooperates with said at least one electric motor 101.

More particularly, the radiator 8 and the support element 9 of the rotor 3 and of the stator 2 of the electric motor 101 are a single so-called "bi-functional" part, because the latter fulfills at least two functions. to know at least a first support function for the rotor 3 and the stator 2, and at least a second cooling function of the electronic member 7. However, the so-called bi-functional part 30 is able to perform other functions which will appear, hereinafter, in the non-limiting example of embodiment presented. In addition, said bi-functional part 30 comprises additional thermal dissipation means 50. Said means 50 can, as is the case in the illustrated embodiments, be in one piece with said bi-functional part (more particularly visible in Figure 4). Note that this part 30 is preferably made of metal, and more particularly aluminum which is a lightweight material and good thermal conductor.

The bi-functional part thus comprises: a base 31 acting as a radiator 8, a portion, for example cylindrical, hollow 33 which acts as a support element 9 of the rotor 3 and the stator 2. In addition, base 31 is provided with a central opening 32.

It will be noted, moreover, that the base 31 is preferably of small thickness, that is to say that the base 31 has a thickness of between 2 and 15 mm. In the embodiment shown, the base 31 has a circular shape, but this can take a rectangular, square, elliptical or triangular shape. The shape of the base 31 of the bi-functional part 30 is depending on the shape of the elements contiguous to said base 31. Furthermore, said additional heat dissipation means 50 is more particularly located on the base 31. More particularly, the base 31 has two opposite faces 52 and 54. The portion hollow 33 is located on the first face 52 of the base 31. Preferably, said means 50 is disposed on the first face 52 of the base 31. Note also that the base 31 has a plane of main extension P, more particularly visible in FIG.

Said additional heat dissipation means 50 comprises, for example, one or more pins (FIG. 5) and / or one or more cooling fins (FIG. 4). These structures are additional heat exchange surfaces disposed on the base 31 which promote the dissipation of heat stored in the base 31 10 in a fluid, such as air. In the presently illustrated embodiments, the studs or fins 50 are perpendicular to the main extension plane P of the base 31. Nevertheless, said pins and / or fins 50 may have an inclination of between 60 and 900 relative to the plane P. Preferably, the rotor 3 is disposed around the stator 2, the rotation of said rotor 3 around said stator 2 causing the rotation of a transmission shaft 11 to cause the setting of the wheel 4 ventilation secured to the said axis 11.

The wheel 4 of the air delivery device 100 comprises, disposed at its periphery, a plurality of inclined fins 17 so that the rotation of said wheel 4 under the effect of the electric motor 101, contributes to generating the pulsed air via said fins 17.

The motor support 5 is, in the embodiment shown, a piece of circular shape, but said support can adopt other shapes such as a rectangular, triangular, elliptical shape ... According to the particular embodiment illustrated in FIG. 1, the motor support 5 comprises a peripheral groove 6 and decoupling elements 16. In addition, the motor support 5 comprises an inner ring 12 and an outer ring 13 between them an annular space constituting the peripheral groove 6. The support 5 also comprises said at least one flow channel of a flow of In the embodiment shown, the latter comprises a lateral air inlet channel 14 and at least one passage 15 directed towards the electric motor 101, to allow the air coming from said channel 14 to pass through. to said engine 101 to cool it. It will also be noted that said additional heat dissipation means is disposed in the path of said air flow.

The decoupling elements 16 form a flexible zone located in the groove 6 delimited by the two rings 12, 13. Said flexible zone has the function of damping the vibrations of the electric motor so that they do not propagate in the motor vehicle , and more particularly in a dashboard of said vehicle.

This zone can indifferently be formed by a damping foam or by spacers 16 made of flexible plastic bearing against the two rings 12, 13. Generally, the electronic member 7 adapted to drive said motor 101 is a pilot electronic card the operation of the electric motor 101, that is to say that it controls for example the speed of said motor 101. The stator 2, meanwhile, is an annular piece, formed of several windings 18. The rotor 3 is likable to a lid comprising a hollow cylindrical body 19 and a wall 20, for example curved, which closes said body 19 at one of its two ends. As more particularly visible in FIG. 2, the stator 2 is, in the mounted position, disposed in the hollow cylindrical body 19 of the stator 3. The rotor 3 also has an axis which passes through the wall 20 at its center and which corresponds to an axis 11 of transmission. A portion 30 of said axis 11 extends inside the cylindrical body 19 coinciding with the axis of revolution of said cylindrical body 19, and another portion of said axis 11 extends outwardly of said rotor 3 and serves support to the ventilation wheel 4.

In addition, the rotor 3 is mounted in the part of the part 30 acting as a support element 9, that is to say in the hollow portion 33, so that the portion of its axis 11 extending inside its hollow body 19, occupy the internal channel of said support member 9, and so that its wall 20 and said body 19 cap, like a cover, the stator 2. Two bearings 22, 23, having a hollow cylinder shape, are inserted into the inner channel of the support member 9, about the axis 11 of the rotor 3, to promote the rotation of said rotor 3 in said support member 9. It should be noted that said bearings 22 and 23 may be ball bearings, roller bearings, needle bearings, etc. The ventilation wheel 4 therefore extends the rotor 3 by being mounted coaxially with said rotor 3 on the axis 11 thereof.

According to an exemplary embodiment illustrated in FIG. 4, the base 31 of the bi-functional piece 30 has reliefs intended to cooperate with complementary reliefs of adjacent parts of the engine 101. The cooperation of the reliefs of the parts adjacent to the engine 101 with the reliefs of the base 31 facilitates the positioning of the bi-functional part 30 within said motor 101. Indeed, these complementary reliefs act as detractor fear. In addition, the base 31 comprises a number of orifices each adapted to receive a screw for fixing the bi-functional part 25 in the electric motor 101 or to allow the attachment of other elements to said bi-part. -Functional 30. The base 31 is extended by at least one hollow portion 33. Said hollow portion 33 is, for example, cylindrical. In the embodiment shown, the hollow portion 33 comprises a first section 34, extended by a second section 35.

In the embodiment shown, the first and second sections 34 are of cylindrical shape, however, the hollow portion 33 may be composed of one or more sections of different shapes and / or diameters.

The first section 34 is located between the base 31 and the second section 35, the outside diameter of said base 31 being greater than the outside diameter of said first section 34, which itself is greater than the outside diameter of said second section 35. first section 34 and the second section 35 each comprise an inner cylindrical channel 36 and 37 in continuity with each other, the diameter of the inner channel 36 of the first section 34 being greater than the diameter of the internal channel 37 of the second section 35. (The internal channel 36 and the arrangement of the two channels 36 and 37 are more particularly visible in Figure 1).

It should be noted that the diameter of the internal channel 36 of the first section 34 is equal to the diameter of the central opening 32 of the base 31. The internal channel 37 of the second section 35 terminates in a flared cylindrical portion, the The diameter is equal to the diameter of the inner channel 36 of the first section 34. The two inner channels 36, 37 are coaxial. The first 34 and the second 35 sections define between them an outer shoulder 38. Similarly, the internal channels 36, 37 of the two sections 34, 35 define between them an internal shoulder 39 (more particularly visible in Figure 1). The base 31 has a disc shape and extends in a plane which is perpendicular to the axis of revolution of the cylindrical hollow portion 33 (or perpendicular to the axis of revolution of the internal channels 36, 37), extending said base 31.

As illustrated in FIGS. 2 and 3, the stator 2 is threaded around the second section 35 and abuts against the external shoulder 39.

The axis 11 of the rotor 3 occupies the internal channel 37 of the second section 35, the flared portion and a portion of the inner channel 36 of the first section 34. The two bearings 22, 23 are threaded about the axis 11 the rotor 2, respectively in the flared portion of the inner channel 37 of the second section 35, and in the inner channel 36 of the first section 34 bearing against the internal shoulder 39. Referring to FIG. 7 and an electrical connector 42, connected to said card 7, are pressed against a face 41 of the base 31, which is opposite to that which is extended by the hollow portion 33. Referring to FIG. , the bi-functional piece 30 gathering the radiator and the rotor and stator support 2 allows a rigorous and precise positioning of said support, by means of the radiator which is stacked naturally on the other 15 elements of the engine electrical 101. So, when the radiator is supposed to be well positioned in the electric motor 101, it follows that the support element 9 of the rotor 3 and the stator 2 is also well positioned. As illustrated in FIG. 3, the electric motor 101 according to the invention also comprises a cover 43 for protecting the electronic card 7 as well as an adapter ring 44 surrounding said cover 43. Note that if the cover 43 is made of a metallic material, or that it is metallized, then it is possible to connect said cover 43 to ground via the part 30.

Thus, when the electric motor 101 is activated, the rotor 3 is rotated around the stator 2, causing the simultaneous rotation of the ventilation wheel 4, which then produces pulsed air. In addition, air outside the device 100 enters the lateral channel 14 of the engine support 5 in order firstly to cool the radiator 8 and thus to keep the electronic card 7 at a relatively low temperature. that is to say at a temperature lower than or equal to 90 ° C, and secondly, to cool the hot zones of the engine 101 located on the rotor 3 and on the stator 2.

It will be appreciated that the air-blast device 100 described above can be advantageously used in a heating, ventilation and / or air-conditioning system (not shown). The air delivery device 100 is, for example, disposed near an air inlet of the heating, ventilating and / or air conditioning system to allow air to flow from outside into said system. 10

Claims (13)

REVENDICATIONS1. Electric motor for an air supply device comprising at least one stator (2), a rotor (3), a support element (9) of said rotor (3) and said stator (2), a radiator (8) for electronic member, characterized in that the support element (9) of said rotor (3) and of said stator (2) and the radiator (8) are one and the same piece (30) said bi-functional, said piece (30) bi -functional further comprising additional means of heat dissipation (50). 2. Motor according to claim 1, characterized in that it comprises a support (5) motor traversed by a fluid flow. 3. Motor according to claim 1 or 2, characterized in that it comprises an electronic member (7) adapted to drive said motor. 4. Motor according to claims 2 and 3, characterized in that the radiator portion of said part (30) bifunctional is inserted between said support (5) motor and said electronic member (7). 5. Motor according to any one of the preceding claims, characterized in that the bi-functional part (30) comprises a base (31) acting as a radiator. 6. Motor according to claim 5, characterized in that said additional heat dissipation means (50) has an angle of between 60 ° and 90 ° relative to the main extension plane of the base (31). 7. Motor according to claim 5 or 6, characterized in that said additional heat dissipation means (50) is located on the base (31) of said bi-functional part (30). 3034919 16 8. Motor according to any one of the preceding claims, characterized in that the bi-functional part (30) comprises a hollow portion (33) which is provided with an internal channel (36, 37) which acts as an element. supporting the rotor (3) and the stator (2). 9. Motor according to claim 8, when it depends on claim 5, characterized in that said base (31) extends in a plane (P) which is perpendicular to the axis of revolution of the internal channel (36, 37) of the hollow portion (33). 10. Motor according to claim 8 or 9, characterized in that the stator (2) is arranged around the hollow portion (33) in contact with the outer surface of said hollow portion (33), and in that the internal channel (36, 37) is adapted to receive a central axis (11) of the rotor (3), said rotor (3) being positioned around said stator (2). 11. Motor according to any one of the preceding claims, characterized in that said additional heat dissipation means comprises one or more fins and / or one or more pins. 12. Motor according to any one of the preceding claims, characterized in that said additional heat dissipation means (50) and said bi-functional part (30) are one piece. 13. Device (100) of air delivery characterized in that it comprises at least one electric motor (101) according to any one of claims 1 to 12.