SELF-VENTING ENCLOSED ENGINE OR AC GENERATOR WITH IMPROVED DRAINAGE AND VEHICLE FOR IT

Description

[0001] The present invention relates to a self-ventilated closed motor or alternator according to claim 1.

[0002] The invention also relates to an associated vehicle.

[0003] The fan, driven by the shaft, notably helps to ventilate the stator.

[0004] The first flange typically includes an internal wall between the fan and the rotor, so that the air inside the motor is essentially circulated without thermal contact.

[0005] Such mixing is not very effective for managing the temperature of the air inside the engine, which is likely to increase significantly when the engine is in use.

[0006] Patent document EP 1 050 949 A1 describes an open motor that can be cooled more efficiently while preventing deterioration of its characteristics. Patent document CN103166363A describes a fully sealed, air-cooled composite system for a traction motor. Patent document US7462964B2 presents a fully enclosed, fan-cooled motor.

[0007] One aim of the invention is therefore to provide a self-ventilated closed motor or alternator with efficient ventilation and good heat exchange.

[0008] For this purpose, the invention relates to a motor or alternator of the aforementioned type, in which the first flange includes an internal wall between the fan and the rotor, said internal wall having through orifices so that the fan communicates fluidly with the rotor.

[0009] The fluidic communication, through the perforated wall, between the rotor and the fan, allows for increased heat dissipation, with the fan acting as a heat exchanger.

[0010] According to other advantageous but optional features of the invention, taken individually or in any technically feasible combination: the first flange comprises an inner wall and an outer wall, the outer wall delimiting the outer wall of the motor at the level of the first flange, the fan being arranged between the outer wall and the inner wall, the outer wall comprising at least one opening; the at least one opening comprises at least a central opening arranged opposite the fan in the principal direction; the first flange comprises an inner wall between the fan and the rotor, said inner wall having through orifices so that the fan communicates fluidly with the rotor, the through orifices representing between 30% and 40% of the surface of the inner wall;The fan has an inner face and an outer face, the fan generating a first flow at the outer face and a second flow at the inner face, the first flow being directed towards the cooling channels of the stator, the second flow being directed towards the cooling channels of the rotor; the motor or alternator includes an air circulator fixed to the shaft and arranged on a second side of the rotor along the main direction, the second side of the rotor being opposite the first side of the rotor along the main direction; and / or the fan includes ribs.

[0011] The invention further relates to a vehicle comprising a traction motor or an alternator, the traction motor or alternator being a motor or an alternator as defined above.

[0012] The invention will be better understood and its advantages will become more apparent in light of the following description, given solely by way of non-limiting example and with reference to the accompanying drawings, in which: [ Fig 1 ] there figure 1 is a cross-sectional view of an example of an engine according to the invention. An example of an engine 10 according to the invention is shown on the figure 1 .

[0013] The motor is, for example, an induction motor.

[0014] Engine 10 is a self-ventilated, enclosed engine.

[0015] Engine 10 is, for example, a traction engine for propelling a vehicle.

[0016] The motor 10 includes a rotor 12, a stator 14, a shaft 16, a fan 18, and a first flange 20.

[0017] The engine also includes here a second flange 22.

[0018] The rotor 12 is adapted to rotate around a main axis X extending along a main direction.

[0019] Rotor 12 defines rotor cooling channels 24.

[0020] Each rotor cooling channel 24 passes through the rotor 12, here in the main direction.

[0021] The rotor cooling channels 24 are distributed, here at regular intervals, on a circle centered on the main X axis.

[0022] The stator 14 radially surrounds the rotor 12.

[0023] The stator 14 comprises 26 windings.

[0024] The stator 14 defines stator cooling channels 28.

[0025] Each stator cooling channel 28 passes through the stator 14, here in the main direction.

[0026] The stator cooling channels 28 are distributed on a circle centered on the main X axis.

[0027] In the example shown, the stator cooling channels 28 are, for example, distributed around the circle at regular intervals.

[0028] The stator 14 has an external surface 30.

[0029] The external surface 30 defines an external surface of the motor 10, here in a central portion of the motor between the first flange 20 and the second flange 22.

[0030] The external surface 30 is, for example, cylindrical.

[0031] Shaft 16 is driven by rotor 12 around the main axis X.

[0032] Tree 16 extends along the main X axis.

[0033] The fan 18 is attached to the shaft 16.

[0034] The fan 18 is therefore adapted to enter into rotation with the shaft 16, and therefore with the rotor 12.

[0035] The fan 18 is arranged on one side of the rotor 12 in the main direction.

[0036] The fan 18 includes a central wall 32.

[0037] Fan 18 has an inner face and an outer face.

[0038] The inner face is the face of the central wall 32 oriented towards the rotor 12.

[0039] The external face is the face of the central wall 32 opposite the internal face.

[0040] Fan 18 includes 34 ventilation elements.

[0041] The ventilation elements 34 include, for example, a second wall, here annular, connected to the central wall 32.

[0042] Alternatively, ventilation elements are, for example, blades or fins.

[0043] The central wall 32 is, for example, arranged between the ventilation elements 34 and the rotor 12 in the main direction.

[0044] The central wall 32 has a free edge 36.

[0045] The free edge 36 extends here over an entire circumference.

[0046] The free edge 36 here exhibits rotational symmetry around the principal axis X.

[0047] The free edge 36 is the part of the central wall 32 furthest from the shaft 16.

[0048] The free edge 36 is here provided with a geometric shape including at least one change of direction.

[0049] The free edge 36 is, for example, provided with crenellations 38, as shown, or with a shoulder.

[0050] The central wall 32 is a solid wall.

[0051] The central wall 32 is devoid of through-holes.

[0052] In one embodiment, the fan 18, here the central wall 32, includes ribs 41, more particularly on the inner face.

[0053] Ribs 41, for example, have an annular shape around the main X axis.

[0054] Alternatively, ribs 41 exhibit, for example, a helical shape.

[0055] The 41 ribs facilitate heat exchange.

[0056] The first flange 20 is arranged on the first side of the rotor 12 along the main direction.

[0057] The first flange 20 includes an internal wall 42.

[0058] The first flange 20 further includes an outer wall 44.

[0059] The inner wall 42 and the outer wall 44 are connected to each other.

[0060] The first flange 20, here more particularly the inner wall 42, is connected to the shaft 16 by a first bearing 40.

[0061] In the example shown, the first bearing 40 is arranged on the shaft 16 between the fan 18 and the rotor 12 in the main direction.

[0062] Alternatively, in an embodiment not shown, the outer wall 44 of the first flange 20 is connected to the shaft 16 by the first bearing. The first bearing is then arranged on the side of the fan 18 opposite the rotor 12.

[0063] The fan 18 is arranged between the outer wall 44 and the inner wall 42.

[0064] The fan 18 is arranged within the first flange 20.

[0065] The first flange 20 is not driven in rotation by the rotor 12, and is fixed relative to the stator 14.

[0066] The outer wall 44 delimits the outer wall of the motor 10 at the level of the first flange 20.

[0067] The outer wall 44 comprises a face 46 and a connecting portion 48, the connecting portion 48 linking the face 46 to the stator 14, more particularly to the external surface 30.

[0068] Face 46 forms a first end of engine 10 along the main direction.

[0069] Face 46 has at least one opening 50 passing through face 46.

[0070] The at least one opening 50 includes at least one central opening arranged opposite the fan 18 in the main direction.

[0071] The internal wall 42 is arranged between the fan 18 and the rotor 12 in the main direction.

[0072] The inner wall 42 connects the first bearing 40 to the stator 14, more particularly at a distance along the radial direction less than the distance from the stator cooling channels 28.

[0073] The first flange 20 defines openings 52 connecting the face 46 to the cooling channels of the stator 28.

[0074] The openings 52 are defined between the inner wall 42 and the outer wall 44.

[0075] Apart from the openings 52, the internal wall 42 and the external wall 44 are connected together, so as to form a single wall.

[0076] The internal wall 42 locally presents a complementary shape 54 to the free edge 36.

[0077] The complementary form 54 includes, for example, crenellations.

[0078] More specifically, the internal wall 42 extends, here in an intermediate portion, to a minimum distance from the free edge 36.

[0079] The complementary form 54 extends at the level of the intermediate portion, opposite the free edge 36.

[0080] The free edge 36 is separated over its entire circumference from the first flange 20, here from the internal wall 42, by a system of baffles, formed here by the complementary shape 54 and the shape of the free edge 36.

[0081] The inner wall 42, more particularly the intermediate portion, is separated from the free edge 36 of the central wall 32 of the fan only by a gap, between 0.1 mm and 1 mm.

[0082] The inner wall 42 has through holes 56.

[0083] The through-holes 56 extend in relation to the fan 18, more particularly to the central wall 32.

[0084] The fan 18 then communicates fluidly with the rotor 12, via the through ports 56.

[0085] The through-holes 56 represent between 30% and 40% of the surface area of ​​the internal wall 42.

[0086] The first flange 20 delimits an internal space 58 connecting the rotor cooling channels 24.

[0087] The second flange 22 is arranged on the second side of the rotor along the main direction, the second side of the rotor being arranged opposite to the first side.

[0088] More specifically, here, the second flange 22 is connected to the shaft 16 by a second bearing 60.

[0089] The second flange 22 is not driven in rotation by the rotor 12, and is fixed relative to the stator 14.

[0090] The second flange 22 comprises, here is made up of, an outer wall 62.

[0091] The outer wall 62 delimits the outer wall of the motor 10 at the level of the second flange 22.

[0092] The outer wall 62 includes a face 64 and a connecting portion 66 linking the face 64 to the stator 14.

[0093] Face 64 forms a second end of engine 10 along the main direction, opposite face 46.

[0094] The second flange 22, here the outer wall 62, defines an internal space 68.

[0095] The second flange 22 has a shape such that it does not extend in relation to the stator cooling channels 28.

[0096] Each stator cooling channel 28 opens directly outside the motor 10.

[0097] The second flange 22 forms a cover for the motor 10, closing the entire motor on the second side, except for the stator cooling channels 28, here for example in a hermetically sealed manner.

[0098] At each stator cooling channel 28, the outer wall 62, more particularly the connecting portion 66, is fixed to the stator 14 at a location between said excluding stator cooling channel 28 and the rotor 12 in the axial direction with respect to the main axis X. Here, the outer wall 62, more particularly the connecting portion 66, is fixed to the stator 14 at a shoulder forming an edge of said stator cooling channel 28, said edge being the edge of the channel closest to the main axis X.

[0099] The baffle system and the shoulder allow for satisfactory sealing of the enclosed space.

[0100] In the example shown, the motor 10 further includes an air blower 70 attached to the shaft 16 and arranged on a second side of the rotor 12 along the main direction, the second side of the rotor being opposite to the first side of the rotor along the main direction.

[0101] The space between the central wall 32 of the fan 18 and the inner wall 42, the internal space 58 delimited by the first flange, the rotor 12, the stator 14 and the internal space 68 delimited by the second flange 22 forms here a closed space, with the exception of the baffle system.

[0102] Air circulator 70 promotes air circulation in the internal space 68.

[0103] The fan 18 generates a first flow 72 at the external face and a second flow 74 at the internal face, the first flow 72 being directed towards the cooling channels of the stator 28, the second flow being directed towards the rotor 12, and in particular the cooling channels of the rotor 24. The first flange 20 and the second flange 22 are such that the first flow 72 is directed towards the cooling channels of the stator 28 and then the outside of the motor 10 and that the second flow 74 is directed towards the cooling channels of the rotor 24 in internal circulation.

[0104] The fan 18 is the only barrier between the outside air and the motor enclosure 10 including the rotor 12, so that the second flow 74 allows efficient heat exchange at the fan 18.

[0105] Such a motor 10 therefore allows for efficient internal and external ventilation, with good heat exchange.

[0106] The teaching of the invention also applies to an alternator, instead of a motor.

Claims

1. A closed self-ventilating motor (10) or alternator comprising: - a stator (14) defining stator cooling channels (28), - a rotor (12) defining rotor cooling channels (24), - a shaft (16) driven by the rotor about a main axis (X) extending in a main direction, - a fan (18) integral to the shaft (16) and arranged on a first side of the rotor (12) along the main direction, and - a first flange (20) arranged on the first side of the rotor (12) along the main direction, the first flange (20) comprising an inner wall (42) between the fan (18) and the rotor (12), the inner wall (42) having through-holes (56) such that the fan (18) is in fluid communication with the rotor (12), wherein the fan (18) has a free edge (36), the free edge (36) being separated along its entire circumference from the first flange (20) by a baffle system (38, 54), the baffle system (38, 54) separating the free edge (36) from the inner wall (42) of the first flange (20), the free edge (36) being separated along its entire circumference from the inner wall (42), the inner wall (42) locally having a complementary shape (54) to the free edge (36), the baffle system being formed by the complementary shape (54) and the free edge (36), and wherein the stator and the rotor are arranged in a closed space, with the exception of the baffle system.

2. Motor or alternator according to claim 1, wherein the first flange (20) comprises an inner wall (42) and an exterior wall (44), the exterior wall (44) defining the exterior wall of the motor (10) at the first flange (20), the fan (18) being arranged between the exterior wall (44) and the inner wall (42), the exterior wall (44) comprising at least one opening (50).

3. Motor or alternator according to claim 2, wherein the at least one opening (50) comprises at least one central opening arranged facing the fan (18) along the main direction.

4. Motor or alternator according to any one of claims 1 to 3, wherein the first flange (20) comprises an inner wall (42) between the fan (18) and the rotor (12), the inner wall (42) having through-holes (56) such that the fan (18) is in fluid communication with the rotor (12), the through-holes (56) representing between 30% and 40% of the surface area of the inner wall (42).

5. Motor or alternator according to any one of claims 1 to 4, wherein the fan (18) has an inner face and an outer face, the fan (18) generating a first flow (72) at the outer face and a second flow (74) at the inner face, the first flow (72) being directed towards the cooling channels of the stator (28), the second flow (74) being directed towards the cooling channels of the rotor (24).

6. Motor or alternator according to any one of claims 1 to 5, comprising an air circulator (70) integral with the shaft (16) and arranged on a second side of the rotor (12) along the main direction, the second side of the rotor (12) being opposite the first side of the rotor (12) along the main direction.

7. Motor or alternator according to any one of claims 1 to 6, wherein the fan (18) comprises ribs (41).

8. A vehicle comprising a traction motor or an alternator, the traction motor or the alternator being a motor (10) or an alternator according to any one of claims 1 to 7.