JP2022538272A - Electrical machine with bearings and closures for bearings [2006.01] - Google Patents

Abstract

The electric machine comprises a bearing and a closing member for the bearing. One aspect of the present invention is a bearing (1) comprising a lateral wall (12) and a skirt (11) extending axially from the lateral wall, wherein a phase pass aperture (123) is located in the lateral wall (1) of the bearing (1). 12) and at least one shutter (2, 2') mounted on the lateral wall (12) of the bearing to partially close at least one phase-pass aperture (123), distributed in the peripheral region of the bearing. and at least one shutter extending at an angle of less than 360°.

Description

The technical field of the invention is that of electrical machines, particularly in the automotive field, with bearings provided with phase output apertures for passing the phase output of the windings of the stator towards the electronic devices of the machine. The electrical machines may be alternators and starter alternators, among others.

An electric machine is known that includes a stator with windings with bundles and phase outputs, a rotor surrounded by the stator, and rear and front bearings surrounding the stator. The aft bearing includes a phase output aperture through which the phase output of the stator windings passes. An electrical machine comprises an electronic device comprising a voltage converter, eg a rectifier and/or an inverter, and a control and management unit for the electrical machine. An electronic device includes a heat sink that cools all the electronics of the electronic device. The heat sink has fins extending from the heat sink wall to the lateral wall of the rear bearing. The lateral wall of the rear bearing has an axial ventilation orifice opening axially through it toward the rotor and toward the heat sink, and a phase output passage through which the phase output of the winding passes so as to be connected to an electronic device. an aperture; The rotor comprises a rotor shaft supported in antifriction bearings secured to front and rear bearing supports. The rolling bearing friction of the rotor shaft in the bearing heats the bearing.

Air drawn in by the fan is introduced radially from the outside, traverses over the fins of the heat sink of the rotating machine, then passes through the rear bearing opening and is blown out by the fan through the radial aperture of the bearing. is discharged. The rotor includes a fan that draws air axially through the axial ventilation orifices and over the fins of the heat sink to dissipate at least a portion of the drawn air through the bundles of stator windings. Partial cooling is discharged through a radial orifice in the rear bearing. The electronic device may be equipped with a temperature sensor to prevent exceeding the maximum temperature of the electric machine as well as to allow the efficiency of the machine to be evaluated. This is important when using the machine repeatedly at maximum power.

In order to reduce the return of hot air coming from the stator windings to the electronic device at the phase output pass-through aperture, it is known to mount a shutter in the form of a ring axially sandwiched between the heat sink and the bearing. ing. A shutter in the form of a ring can overhang the aperture slightly while passing the phase output. The ring may also have a cap or petal to improve the efficiency of preventing hot air from returning. The shutter is axially mounted in the bearing by radially inserting the phase output into an opening in the shutter, and then a connector, such as a lug, is secured to the end of the phase output.

However, with such a shutter in the form of a ring, the bearings are not cooled rapidly and the thermal conductivity resistivity of the heat sink increases due to the short fins, which can raise the temperature of the electrical machine above its maximum temperature. and may prevent the use of electrical machines at maximum power. Furthermore, because of these shutters in the form of rings, especially when the machine is not on (when the motor is off), the shutters in the ring form hinder the cooling of the bearings or limit the heat transfer performance of the heat sink. possibly, resulting in less rapid cooling of the windings and thus less efficiency of the electric machine the next time the vehicle is started. The cooler the stator windings, the more efficient the machine, and the more powerful the machine's electronic devices, the more effective the heat sink needs to be.

In order to reduce vehicle pollution, it is necessary to have a powerful electric machine while still having good electric machine efficiency.

The present invention provides a solution to the above problems by allowing a larger surface area of the bearings to be traversed by the blowing air.

One aspect of the present invention is
A bearing comprising a lateral wall and a skirt extending axially from the lateral wall, the phase passing apertures being distributed in a peripheral region of the lateral wall of the bearing;
at least one shutter mounted on a lateral wall of the bearing to partially close the at least one phase-pass aperture, the shutter extending at an angle of less than 360°;
for a rotating electrical machine of axis X, comprising at least

While the present invention allows the shutter to avoid hot air returning through the phase-pass aperture, in the prior art, the blowing air would flow over the entire radial portion of the bearing covered by the shutter in the form of a ring. allow crossing.

Specifically, some of the air drawn in through the axial ventilation orifice may pass through the phase output pass-through aperture and be expelled by the fan. The shutter can thus reduce a portion of the fan-drawn air coming from the phase output orifice aperture. Therefore, reducing this return air promotes the intake of external air that is not hotter than the air returning through the phase output pass-through aperture.

Furthermore, the fact that the shutter does not cover 360° allows some of the air drawn in from the outside to traverse over part of the peripheral area of the bearing or over the entire radial portion of the bearing, whereas in the prior art A portion of this radial portion between the inner radius of the shutter and the outer radius of the bearing was covered by the shutter. By traversing this peripheral region, cooling of the bearing can be improved. Furthermore, this allows the heat sink to have long fins in this peripheral area, thus allowing the electronics to be well cooled by the heat sink, thus providing an effective and possibly powerful electrical machine. can have

In addition to the features just outlined, the electric machine may have one or more additional features from the following, considered individually or in any technically feasible combination.
According to one embodiment, the shutter comprises openings in the form of slots extending at an angle of less than 180° and opening to the outer periphery. This facilitates mounting. This is because the shutters can be mounted, for example radially and/or pivotally, rather than axially mounted. The shutter is therefore easy to install and the machine is therefore inexpensive. Additionally, the phase output may be secured to the connector, eg, a lug, before the shutter is mated, even if the aperture size is smaller than or comparable to the connector.
According to one embodiment, the shutter comprises an inner radius and an outer radius, the difference between the inner radius and the outer radius being at least two times smaller than the outer radius of the lateral wall of the bearing. This allows the lateral walls that can be cooled to have a large area.
According to one embodiment, the shutters attached to the lateral walls of the bearing cover less than 50% of the surface of the lateral walls of the bearing. As a result, the area of the lateral wall cooled by the blown air can be increased, so that the heat transfer between the lateral wall and the blown air can be improved.
According to one embodiment, the shutter extends radially between an inner edge with an inner radius and an outer edge with an outer radius, and between two side edges connecting the inner edge to the outer edge. The angular distance between the side edge extending at an angle and the aperture closest to the bearing side edge and partially closed by the shutter is the phase output pass aperture that is closed and the aperture that is closed. shorter than the distance between the nearest separate phase output passing apertures. Therefore, the area of the lateral walls that can be cooled by the incoming air is increased.
According to one embodiment, the machine also comprises a heat sink attached to the bearing opposite the outer surface of the lateral wall of the bearing partially covered by the shutter.
According to one implementation of this embodiment, the heat sink is provided with fins oriented substantially along the axis X and directed towards the outer surface of the transverse wall of the bearing, at least one of the fins being attached to the shutter. They are arranged oppositely and have a height facing the shutter along the axis X, but their height is lower than at least one other fin arranged opposite the outer surface of the lateral wall. This can maximize the heat exchange between the air and the heat sink, thus improving its cooling by having long fins.
According to this implementation of this embodiment, at least one of the fins arranged opposite the shutter comprises:
a first portion facing the shutter and having a first height along axis X;
a second portion facing the outer surface of the lateral wall and having a second height greater than the first height;
have
The first portion and the second portion extend radially and axially and are radially separated from each other.
According to one embodiment, the shutter has a body facing the lateral wall comprising at least one portion covering the aperture for closing the phase-pass aperture and facing the at least one phase-pass aperture for passage of the phase output. and at least one phase-passing aperture arranged in a vertical direction.
According to one embodiment, the cover part comprises a shutter and is also provided with at least one petal extending into the opening, the petal being made of a removable material, the petal covering the opening at least partly. close up. This allows for improved closure of the pass aperture while facilitating attachment of the output phase through the shutter. Specifically, if the shutter comprises an opening in the form of a hole or slot for the passage of the phase output, the aperture is less closed than the petal and the slot or hole is similar to the diameter of the phase output. can be more difficult.
According to one embodiment, the shutter comprises a projection extending axially along the axis X from the body, the shutter comprising fins of the heat sink associated with the projection and of the body associated with the transverse wall of the bearing. It is sandwiched between the inner surface. This allows the shutter to be axially retained in a simple manner while making it possible to compensate for assembly clearances. According to this example and the embodiment with a heat sink, the protrusions are elastically deformed by the ends of the fins, thus pressing the shutter against the outer surface of the lateral wall.
According to one embodiment, the shutter comprises at least one low retaining wall extending axially from the body along the axis X into the aperture. For example, in the above embodiment, the short wall extends outwardly along axis X, eg, axially towards the heat sink. According to another example, the short wall extends axially along the axis X towards the bundle when the shutter is attached to the outer surface of the lateral wall.
According to one implementation of this embodiment, the low retaining wall comprises at least one angular stop extending radially along the radial edge of the phase pass aperture.
According to one embodiment, the low retaining wall comprises a radial wedge portion extending into the aperture along an angular edge with respect to the axis X. The first portion can position the shutter and hold it at an angle during installation, and the second portion can radially position the shutter and hold it against the bearing during installation. can do.
According to one embodiment, the shutter comprises a low air barrier extending axially from the body towards the heat sink. This allows the low walls to limit the hot air return even better.
According to one embodiment, the shutter is attached to the outer surface of the lateral wall.
According to a variant of the above embodiment, the shutter is attached to the inner surface of the lateral wall between the bundle and the lateral wall.
According to one embodiment, the shutter closes the three phase output pass apertures.
According to one embodiment, the electric machine comprises two shutters angularly opposed to each other, each closing at least three phase output passage apertures.
According to one embodiment, the bearing comprises a plurality of axial ventilation openings facing the rotor.

The invention and its various uses will be better understood upon reading the following description and studying the accompanying drawings.

The drawings are presented as a generally non-limiting representation of the present invention.
FIG. 1 shows a schematic representation of a three-dimensional view of a part of a bearing and a shutter of an electric machine according to a first embodiment. FIG. 2 shows a three-dimensional view of part of a bearing of an electrical machine. FIG. 3 shows a three-dimensional view of the bearing, shutter, stator and heat sink of the electric machine according to the first embodiment. FIG. 4 shows a three-dimensional view of part of the bearing, shutter, part of the stator and part of the heat sink of the electric machine. FIG. 5 shows a three-dimensional cross-sectional view of the bearing, shutter and heat sink of the electrical machine. FIG. 6 shows the shutter of FIG. 2 viewed from the heat sink. FIG. 7 shows the shutter of FIG. 2 as seen from the bearing. FIG. 8 shows a perspective cross-sectional view of a shutter according to another embodiment.

The drawings are presented as a generally non-limiting representation of the present invention. Unless otherwise indicated, identical elements appearing in different figures bear a single reference numeral.

The electrical machine is also surrounded by a bearing 1, at least one shutter 2, a stator 3 surrounded by the bearing 1 and a stator 3 comprising a rotor shaft 41 passing through rolling bearings fixed to the bearing 1. a rotor 4;

FIG. 1 shows a three-dimensional view of a part of a bearing 1, a shutter 2 and a rotor 4 of an electrical machine according to a first embodiment.

FIG. 2 shows a three-dimensional view of bearing 1 and rotor shaft 41 of an electrical machine according to a first embodiment.

The bearing 1 comprises an axially extending skirt 11 and a radially extending lateral wall 12 . The lateral wall 12 comprises an outer surface 120 visible in both FIGS.

The electrical machine also comprises a heat sink 5, which is mounted on the bearing 1, facing the outer surface 120 of the lateral wall 12 of the bearing 1 partially covered by the shutter 2 and made for example of an aluminum alloy. The shutter is made of plastic, for example.

FIG. 3 shows a three-dimensional view of the bearing 1, shutter 2, stator 3 and heat sink 5 of an electrical machine according to a first embodiment.

FIG. 4 shows a three-dimensional cross-sectional view of the bearing 1 , shutter 2 , stator 3 and heat sink 5 of an electrical machine according to a first embodiment without rotor 4 .

In this case, in this example, the electric machine comprises two shutters 2 visible in FIG. 4, only one of which will be described below. In this case, the two shutters are identical in this example, but may be different. Their identity reduces the number of part references and thus the cost of the electric machine.

The skirt 11 of the bearing is provided with radial ventilation openings 110 which can be seen in FIGS.

The bearing 1 surrounds part of a stator 3 comprising a stack of laminations 30 and windings 31 comprising bundles 310 and phase outputs 312 . In this case the windings are for example double three-phase windings with delta or star connection pins, for example distributed wave windings.

The lateral wall 12 comprises an axial ventilation opening 124 facing the rotor 4 and a rolling bearing support 122 on which a rolling bearing supporting the shaft of the rotor is mounted. Side wall 12 includes a phase output passing aperture 123 located in the peripheral region of the side wall through which phase output 312 passes. In this case the lateral wall 12 comprises six phase output passing apertures 123 .

Each shutter 2 is mounted in this example on the outer surface 120 of the lateral wall 12 and closes three phase output pass apertures 123 in each case. The term "closed" means partially closed.

The shutters 2 extend at an angle of less than 360° and since there are two shutters 2 each shutter 2 extends at an angle of less than 180°, in this case about 45°. This facilitates mounting. This is because the shutter 2 can be mounted, for example radially or pivotally, without being axially mounted. Specifically, for a 360° shutter, mounting involves axial mounting.

Furthermore, the peripheral area comprising the phase output pass aperture 123 is not wholly covered by the shutter 2 . The peripheral area is the area of the lateral wall 12 located between the outer radius Re of the peripheral wall 12 and the inner radius of the passage aperture 123 .

The shutter 2 comprises an inner edge 21 with an inner radius ri and an outer edge 22 with an outer radius re.

The term "inner radius" means the smallest radius with respect to the X axis and the term "outer radius" means the largest radius with respect to the X axis.

In this embodiment the difference between the inner radius ri and the outer radius re of the shutter 2 is at least two times smaller than the lateral wall outer radius Re. This allows the lateral walls that can be cooled to have a large area.

In this case the inner edge 21 is in the form of a continuous arc and in this case the outer edge 22 is in the form of an interrupted arc. In other words, outer edge 22 comprises a plurality of spaced apart edge surfaces 220 . Each spaced apart edge surface 220 is in the form of an arc, but may be straight and angled with respect to each other to form interrupted arcs.

5 shows a perspective sectional view of the shutter 2, the heat sink 5 and the bearing 1. FIG.

[FIG. 6] shows a perspective view of the shutter 2 seen from the heat sink side.

FIG. 7 shows a perspective view of the shutter 2 viewed from the bearing 1 side.

The shutter 2 has an inner contact surface 200 facing the outer surface 120 of the lateral wall 12, visible in FIG. 2, and an outer contact surface 201, visible in FIGS. A main body 20 is provided.

Body 20 faces at least one phase pass aperture 123 for passage by one of the phase exits 312 and at least one cover portion 203 for each phase pass aperture 123 to close the phase pass aperture 123. at least one passage opening 23 arranged as a .

Each passage opening 23 thus has a phase output 312 that passes through the passage opening 23 . In other words, each phase output passing aperture 123 is partially closed by shutter 2 by cover portion 203 .

In this embodiment, each opening 23 extends to two spaced apart edge surfaces 220 . In other words, each opening is in the form of a slot. Consequently, in this embodiment the shutter 2 may be mounted radially and/or pivotally by inserting the phase output 312 into its opening. According to another embodiment, the shutter 2 comprises openings in the form of holes. In other words, in this alternative embodiment, the outer edge is in the form of a continuous arc and not interrupted as in this embodiment.

The shutter 2 also comprises two side edges 24 each connecting the inner edge 21 to the outer edge 22 .

Thus, in this example the two shutters 2 cover less than 50% of the area, in this case about a quarter, in the form of an arc of the outer surface 120 between the inner radius ri and the outer radius re. A cooling surface 125 in this region of the outer surface 120 of the lateral wall 12 is thus traversed by the air circulating within the electric machine. As a result, the area of the outer surface 120 of the lateral wall that can be cooled can be widened, and heat dissipation can be improved.

Further, in this embodiment, the angular distance between the outer edge 22 and the aperture 123 closest to the outer edge 22 by the shutter is the distance between the aperture 123 to be closed and another aperture 123 closest to the aperture 123 to be closed. shorter than distance. Therefore, the area of the lateral walls that can be cooled by the incoming air is increased.

In this embodiment the shutter 2 comprises a projection 25 extending axially along the axis X from the body 20, in this case from the external contact surface 201. As shown in FIG. In this embodiment, the protrusion 25 is positioned radially inwardly with respect to the opening 23 .

The electric machine also comprises electronic devices (not shown) comprising electronic components, for example a microcontroller for controlling and managing the machine, power transistors, for example MOSFETs or IGBTs for rectifying or controlling the electric power of the electric machine. Electronic devices are mounted on heat sinks 5 for cooling, and in particular some of the electronic components may additionally be mounted on heat sinks for effective cooling.

The heat sink 5 comprises a body 51 and fins 52 oriented substantially along the axis X and directed towards the outer surface 120 of the lateral wall 12 of the bearing 1 . The fins 52 thus extend axially from the cooling surface 510 of the body 51 towards the bearing 1 . In this embodiment, at least one of the fins 52, known as shutter fin 52a, is positioned opposite the shutter 2 and has a height H1 along the axis X along at least the entire radial length facing the shutter. and the height H1 is less than at least another height H2 of the fins 52 arranged opposite the cooling surface 125 . This allows maximizing the heat exchange between the air and the heat sink 2, thus improving cooling by having long fins. The term "height" means the height of the longest part.

In this embodiment the heat sink 5 comprises 7 small fins 52a per shutter 2, ie 14 small fins 52a. In this case the two groups of seven small fins are identical and arranged in the same way as the other heat sinks 2 . In the following only one group of seven small fins is described.

In this example of this embodiment, each small fin 52a has a first portion 521a facing the shutter 2 and having a height H1 and a second portion 522a facing the outer surface 120 and having a height H2. , provided.

According to another embodiment not shown, the small fin 52a may have one height H1 along its entire length, i.e. without a second portion.

According to another embodiment not shown, the second portion 522a facing the outer surface 120 may have a height less than the height H2 but at least greater than the height H1. The second portion 522a may also have a height greater than height H2.

In this embodiment, at least one of the small fins 52a has an end that contacts the protrusion 25. As shown in FIG. In this case, there are three protrusions 25 per shutter 2 and three of the seven small fins 52a contact the corresponding protrusions 25 respectively.

Each protrusion 25 allows the shutter 2 to be sandwiched between one of the three small fins 52 a of the heat sink 5 associated with the protrusion 25 and the body 20 associated with the lateral wall 12 of the bearing 1 . This allows the shutter 2 to be axially retained in a simple manner while still allowing the assembly clearance to be compensated. In this case, in this embodiment each of the three protrusions 25 is elastically deformed by the end of one of the three of the seven small fins, thus pressing the shutter 2 against the outer surface of the lateral wall. The shutter is therefore held by the fins and bearings.

According to this embodiment the shutter 2 comprises at least one low retaining wall 26 extending axially along the axis X from the body 20 into the phase output passing aperture 123 . In this case, the low retaining wall 26 extends axially from the body 20 along the axis X towards the bundle 310 into the aperture 123 . Such low retaining walls 26 can retain the shutter 2 at an angle or radially.

In the illustrated embodiment, the shutter 2 comprises one low retaining wall 26 per phase output passing aperture 123, as can be seen in particular in FIG. The low retaining wall 26 comprises an angular stop portion 26b extending radially against the inner radial edge 123a of the aperture 123. As shown in FIG. Further, in this embodiment, the low retaining wall 26 is a radial wedge extending angularly into the aperture 123 along an inner angular edge 123b of the aperture 123 extending at an angle to the axis X. A portion 26a is provided. This allows the angular and radial positioning of the shutter 2 during installation and thus the angular and radial retention of the shutter 2 . In particular, in this embodiment the low retaining wall 26 is provided with two angular stops 26b for retaining in both directions of rotation. Thus, during positioning of the shutter 2, the shutter 2 is angularly positioned by abutting each pair of angular stops 26b at each phase pass aperture 123 so that the phase output 312 and each phase output pass aperture 123 It is radially wedged by a radial wedge portion between each inner edge.

Furthermore, in this embodiment the shutter 2 comprises a low air barrier 27 extending axially from the body 20 towards the heat sink 5 . This makes it possible to limit the return of the hot air even better. In this case, the low air barrier 27 extends from the body 20 along the edge surface 220 and around the opening 23 . In this embodiment the low air barrier 27 extends axially like the projection 25 .

In this embodiment, the cover portion 203 comprises a portion of the body 20 from which the low air blocking wall 27 extends and a portion of the body from which the low retaining wall 26 extends.

Another embodiment of the electric machine is identical to the first embodiment, with the exception of the shutter 2 . In this embodiment, the electrical machine comprises one shutter 2' per phase output passing aperture 123, i.e. twelve shutters 2'.

FIG. 8 shows a cross-sectional view of the shutter 2'.

According to one implementation of this embodiment, each shutter 2 ′ also comprises a petal 27 .

Each petal 27 is made of a removable material and the petal at least partially closes the opening. This allows for improved closure of the pass aperture while facilitating attachment of the output phase through the shutter.

The petals 27 are pyramidally inclined with respect to the plane P in which the body 20 of the shutter 2' extends. The petals may, for example, form an inclination angle A1 of approximately 45° with respect to the plane P in which the body 20 extends.

Each petal 27 may be formed in several parts. In the exemplary embodiment shown in FIG. 8, each petal 27 has a ramp 271 and a lip 272 . An angled portion 271 extends between the body 20 and a lip 272 that extends toward the free end of the petal 27 . These lips 272 define openings 23' for the passage of phase outputs 312. Further, in this embodiment, the lip 272 extends in a plane substantially parallel to the plane P in which the body 20 of the shutter 2 extends in an unstressed state. In a variant of the embodiment not shown, the petals may comprise several portions with different slopes to form a pyramidal shape.

Petals can optimize the closure of the phase output pass aperture 123 . Specifically, if the shutter has a hole or slot for passage of the phase output 312, the aperture 123 is less closed than the petal, and if the slot or hole is similar to the diameter of the phase output, mounting can be more difficult.

The shutter 2' comprises a single protrusion which can be identical to the protrusion of the shutter 2 in the first embodiment. The shutter 2' can thus have these side edges 24 separated along a length between 1.1 times the maximum width of the phase output passing aperture. The width is measured perpendicular to the outer radius re and perpendicular to the thickness of the shutter 2' measured parallel to the machine axis X.

According to one variant of this embodiment, the shutter has no petals. In other words, the shutter comprises an opening similar to that of the shutter in the first embodiment. The shutter thus comprises only part of the shutter of the first embodiment and covers only one phase output pass aperture 123 .

According to an implementation of the first embodiment, the shutter also comprises petals as in the second embodiment.

According to a variant of one of the above two embodiments, the shutter is attached to the inner surface of the lateral wall between the bundle and the lateral wall.

Claims (10)

A bearing (1) comprising a lateral wall (12) and a skirt (11) extending axially from said lateral wall, wherein a phase pass aperture (123) extends around said lateral wall (12) of said bearing (1). bearings distributed over an area;
at least one shutter (2, 2') mounted on said lateral wall (12) of said bearing to partially close at least one phase pass aperture (123), said shutter extending over less than 360° at least one shutter extending at an angle;
A rotating electrical machine of axis X, comprising at least a 2. The electric machine of claim 1, wherein the at least one shutter extends at an angle of less than 180[deg.] and comprises an opening in the form of a slot opening to the outer periphery. Said shutter (2) comprises an inner radius (ri) and an outer radius (re), the difference between said inner radius (ri) and said outer radius (re) being the outer radius of said lateral wall (12) 3. An electric machine as claimed in claim 1 or 2, which is at least two times smaller than (Re). 4. Any of claims 1 to 3, wherein the shutter (2) attached to the lateral wall (12) of the bearing (1) covers less than 50% of the surface of the lateral wall (12) of the bearing (1). 1. The electric machine according to 1. said shutter (2) extends radially between an inner edge (21) with an inner radius (ri) and an outer edge (22) with an outer radius (re), and said inner edge (21) to said outer edge (22), the side edge (24) closest to said side edge (24) and said shutter ( 2) the angular distance between said closed phase output pass aperture (123) and the closest another to said closed phase output pass aperture (123); 5. The electric machine according to any one of claims 1 to 4, wherein the distance is less than the distance between the phase output passing aperture (123) of the . Claim further comprising a heat sink (5) mounted on said bearing (1) facing an outer surface (125) of said lateral wall (12) of said bearing (1) partially covered by said shutter (2). Item 6. The electric machine according to any one of Items 1 to 5. Said heat sink (5) has fins (52, 52a, 52b) oriented substantially along said axis X and directed towards said outer surface (125) of said lateral wall (12) of said bearing (1). is provided, at least one of said fins (52a) being arranged opposite said shutter (2) and at least one other fin (52b) arranged opposite said outer surface (125) of said lateral wall 7. An electric machine according to any one of the preceding claims, having a height (H1) facing said shutter (2) along said axis X lower than . said at least one of said fins (52a) arranged opposite said shutter (2),
a first portion (521a) facing said shutter (2) and having said first height (H1) along said axis X;
a second portion (522a) facing said outer surface (125) of said lateral wall (12) and having a second height (H2) higher than said first height (H1);
8. The electric machine of claim 7, comprising: 9. The apparatus of claims 1 to 8, wherein said shutter (2) comprises at least one low retaining wall (26a) extending axially from said body along said axis X into said phase output pass aperture (123). An electrical machine according to any one of the preceding claims. 10. A shutter (2) according to any one of the preceding claims, wherein said shutter (2) comprises a low air barrier (27) extending axially from said body (20) towards said heat sink (5). electromechanical.

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