Stator

Abstract

Stator (1) for an electrical machine (2), comprising a stator body (3) with a plurality of stator teeth (4) arranged in a circumferentially distributed manner and stator slots (5) formed between the stator teeth (4) and extending in the axial direction through the stator body (3), wherein stator windings (6) are arranged in the stator slots (5), which emerge axially on both sides from the stator body (3) to form a first winding head (12) and a second winding head (13), and in the direction of gravity above the first winding head (12) and second winding head (13), these are at least partially covered by a sprinkling device (9) carrying a cooling fluid (8), which is formed in two parts from a first part (10) and a second part (11), and a cooling fluid inlet (14) is formed on the first part (10) or the second part (11) of the sprinkling device (9), through which the cooling fluid (8) can be fed to the irrigation device (9),and the first part (10) has a circular arc-like first irrigation channel (15) with first outlet openings (16) for the cooling fluid (8) directed towards the first winding head (12), and the second part (11) has a circular arc-like second irrigation channel (17) with second outlet openings (18) for the cooling fluid (8) directed towards the second winding head (13), wherein the first part (10) and the second part (11) are fluidically connected to one another by an axially extending connecting channel (19), so that the cooling fluid (8) can be distributed from the cooling fluid inlet (14) to the first irrigation channel (15) and the second irrigation channel (17), characterized in that the connecting channel (19) is formed by a hollow cylindrical first channel section (20) formed integrally with the first part (10) of the irrigation device (9) and a a hollow cylindrical second channel section (21) formed integrally with the second part (11) of the irrigation device (9),wherein the second channel section (21) encompasses the first channel section (20) at least in sections and bears against it.,

Description

[0001] The present invention relates to a stator for an electrical machine, comprising a stator body with a plurality of circumferentially distributed stator teeth and stator slots formed between the stator teeth and extending in the axial direction through the stator body, wherein stator windings are arranged in the stator slots, which emerge axially on both sides from the stator body to form a first winding head and a second winding head, and in the direction of gravity above the first winding head and second winding head, these are at least partially covered by a sprinkling device carrying a cooling fluid, which is formed in two parts from a first part and a second part, and on the first part or the second part of the sprinkling device, a cooling fluid inlet is formed through which the cooling fluid can be supplied to the sprinkling device,and the first part has a circular arc-shaped first irrigation channel with first outlet openings for the cooling fluid directed towards the first winding head, and the second part has a circular arc-shaped second irrigation channel with second outlet openings for the cooling fluid directed towards the second winding head, wherein the first part and the second part are fluidly connected to one another by an axially extending connecting channel, so that the cooling fluid can be distributed from the cooling fluid inlet to the first irrigation channel and the second irrigation channel.

[0002] Electric motors are increasingly being used to power motor vehicles, creating alternatives to combustion engines that require fossil fuels. Considerable efforts have already been made to improve the everyday suitability of electric drives and also to provide users with the same level of driving comfort they are accustomed to.

[0003] A detailed description of an electric drive can be found in an article in the magazine ATZ, Volume 113, May 2011, pages 360-365, by Erik Schneider, Frank Fickl, Bernd Cebulski, and Jens Liebold, titled "Highly Integrated and Flexible Electric Drive Unit for E-Vehicles." This article describes a drive unit for a vehicle axle that includes an electric motor arranged concentrically and coaxially with a bevel gear differential.

[0004] Such drive units are also referred to as e-axles or electrically operated drive trains.

[0005] In addition to purely electric drivetrains, hybrid drivetrains are also known. Such drivetrains in hybrid vehicles typically comprise a combination of an internal combustion engine and an electric motor, enabling purely electric operation—for example, in urban areas—while maintaining sufficient range and availability, especially for long-distance journeys. Furthermore, in certain operating situations, it is possible to use both the internal combustion engine and the electric motor simultaneously.

[0006] In the development of electric motors intended for electric axles or hybrid modules, there is a continuing need to increase their power densities, making the necessary cooling of the electric motors increasingly important. Due to the necessary cooling performance, hydraulic fluids, such as cooling oils, have become the preferred choice in most concepts for dissipating heat from the thermally stressed areas of an electric motor.

[0007] An oil pump is often used to supply an electric axle or hybrid module with lubricating and cooling oil. This pump typically delivers the cooling oil to a pipe system, which then distributes the cooling oil to the various lubrication and cooling points. Stator showers, also known as sprinkler systems, are occasionally used to cool an electric machine in such electric axles or hybrid modules. Such sprinkler systems are known, for example, from US 2012 / 0 126 641 A1 or US 2019 / 0 305 639 A1. These sprinkler systems allow effective cooling of the winding heads of the electric machines by being arranged above the winding heads in the direction of gravity. The sprinkler systems typically have a plurality of openings from which the cooling oil emerges and subsequently flows onto the winding heads for cooling.

[0008] From the generic document KR 10 2020 102 253 A, a stator with an integrated cooling system in a housing is known, in which the cooling fluid in the housing is redirected in such a way that it is directed directly to the winding head ends.

[0009] The document WO 2020 / 059 909 A1 also discloses a stator cooling system which is integrated in a housing, wherein several nozzles are provided in the housing which direct the cooling oil on the inside of the housing onto the components to be cooled.

[0010] For manufacturing and assembly reasons, the piping system of irrigation systems is often made of multiple parts and at least partially of plastic. The transition points between the various components of such irrigation systems must be sufficiently leak-tight.

[0011] It is the object of the present invention to provide a stator for an electrical machine which has improved cooling fluid-based cooling, has a low leakage rate and, in particular, is also easy to install.

[0012] This object is achieved by a stator for an electrical machine, comprising a stator body with a plurality of stator teeth arranged in a circumferentially distributed manner and stator slots formed between the stator teeth and extending in the axial direction through the stator body, wherein stator windings are arranged in the stator slots, which emerge axially on both sides from the stator body to form a first winding head and a second winding head, and in the direction of gravity above the first winding head and second winding head, these are at least partially covered by a sprinkling device carrying a cooling fluid, which is formed in two parts from a first part and a second part, and on the first part or the second part of the sprinkling device, a cooling fluid inlet is formed through which the cooling fluid can be supplied to the sprinkling device,and the first part has a circular-arc-shaped first irrigation channel with first outlet openings for the cooling fluid directed towards the first winding head, and the second part has a circular-arc-shaped second irrigation channel with second outlet openings for the cooling fluid directed towards the second winding head. The first part and the second part are fluidly connected to one another by an axially extending connecting channel, so that the cooling fluid can be distributed from the cooling fluid inlet to the first irrigation channel and the second irrigation channel. The connecting channel is formed by a hollow-cylindrical first channel section formed integrally with the first part of the irrigation device and a hollow-cylindrical second channel section formed integrally with the second part of the irrigation device. The second channel section encompasses the first channel section at least in sections and bears against it.

[0013] This provides the advantage of providing a particularly easy-to-install, plug-in design of an irrigation system that is sufficiently leak-proof.

[0014] A further advantage is achieved that a surface cooling of the winding heads of the stator is possible, which is particularly advantageous for stators with a comparatively high power density.

[0015] Furthermore, the two-part design of the irrigation system makes it particularly easy to manufacture and assemble. For example, the irrigation system also allows for a leak test before installation with the stator body, so that potential leaks can be easily detected during series production.

[0016] The invention can thus contribute to reducing costs, for example, by eliminating the need to screw the two shell elements together and thus optimizing the assembly process, as well as improving the efficiency of the electric machine through effective winding head cooling. Furthermore, the risk of leaks can be avoided by a design with comparatively few joints between the two parts of the irrigation system and by conducting a leak test before installing the irrigation system.

[0017] The stator according to the invention is preferably designed for use in a radial flux machine. A stator for a radial flux machine is typically cylindrical and generally consists of electrically insulated, layered, and stacked laminations. Distributed around the circumference, grooves are cut into the laminations, running essentially parallel to the rotor shaft. These grooves accommodate the stator winding or parts of the stator winding.

[0018] Stator windings are embedded in the stator slots of the stator according to the invention. A stator winding is an electrically conductive conductor whose length is significantly greater than its diameter. The stator winding can, in principle, have any cross-sectional shape. Rectangular cross-sectional shapes are preferred, as these allow high packing and, consequently, power densities to be achieved. A stator winding is most preferably made of copper. A stator winding preferably has insulation. To insulate the stator winding, for example, mica paper, which for mechanical reasons can be reinforced by a glass fabric carrier, can be wound in strip form around one or more stator windings, which are impregnated with a curing resin. In principle, it is also possible to use a curable lacquer layer without mica paper to insulate a stator winding.

[0019] The stator according to the invention further comprises a stator body. The stator body can be formed in one piece or in multiple pieces, in particular segmented. A one-piece stator body is characterized in that the entire stator body is formed in one piece over its circumference. The stator body is generally formed from a plurality of stacked laminated electrical sheets, each of the electrical sheets being formed to form a closed circular ring. A segmented stator body is characterized in that it is constructed from individual stator segment parts. The stator body can be constructed from individual stator teeth or stator tooth groups, each individual stator tooth or each individual stator tooth group being formed from a plurality of stacked laminated electrical sheets, each of the electrical sheets being designed as a stator segment sheet part.

[0020] The stator body is preferably formed from one or more stator lamination stacks. A stator lamination stack is understood to be a plurality of laminated individual laminations or stator laminations, usually made of electrical steel, which are stacked and stacked together to form a so-called stator lamination stack. The individual laminations can then be held together in the lamination stack by gluing, welding, or screwing.

[0021] The stator teeth of the stator are preferably formed in the stator body. Stator teeth are components of the stator body that are circumferentially spaced, tooth-like, radially inwardly directed (inner rotor) parts of the stator body, and between their free ends and a rotor body, an air gap for the magnetic field is formed. The air gap is the gap existing between the rotor and the stator. In a radial flux machine, this is a substantially circular gap with a radial width that corresponds to the distance between the rotor body and the stator body.

[0022] The stator is particularly intended for use in an electric machine within a drive train of a motor vehicle. The electric machine is particularly intended for use within a drive train of a hybrid or fully electric motor vehicle. In particular, the electric machine is dimensioned such that vehicle speeds greater than 50 km / h, preferably greater than 80 km / h and in particular greater than 100 km / h can be achieved. Particularly preferably, the electric machine has an output greater than 30 kW, preferably greater than 50 kW and in particular greater than 70 kW. It is further preferred that the electric machine provides speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, most particularly preferably greater than 12,500 rpm.

[0023] The stator can be housed in a motor housing of the electric machine. A motor housing can, in particular, be made of a metallic material. Advantageously, the motor housing can be formed from a metallic cast material, such as cast aluminum, die-cast aluminum, gray cast iron, or cast steel. In principle, it is also conceivable to construct the motor housing entirely or partially from a plastic.

[0024] During operation of the electric machine, a cooling fluid flows through the irrigation device of the stator according to the invention. The cooling fluid in the electric machine has the function of dissipating heat as efficiently as possible from areas of the electric machine that are heating up and preventing undesirable overheating of these areas. In addition to this main task, the cooling fluid can also provide lubrication and corrosion protection for the moving parts and the metal surfaces of the cooling system of the electric machine. Furthermore, it can also, in particular, remove contaminants (e.g., due to abrasion), water, and air. The hydraulic fluid is preferably a liquid. The cooling fluid can, in particular, be an oil.

[0025] According to an advantageous embodiment of the invention, it can be provided that the first channel section has an inner circumferential surface and the second channel section has an outer circumferential surface, wherein the inner circumferential surface and the outer circumferential surface are designed such that they define two axially spaced-apart, circumferentially annular contact regions against which the inner circumferential surface and the outer circumferential surface rest, and an annular space is defined axially between the annular contact regions. The advantage of this embodiment lies in the fact that a particularly tight, plug-in joint can be realized. By forming an annular space between the contact regions, a type of collecting reservoir can be provided in which cooling fluid that has been able to pass through one of the contact regions can be caught and collected.Furthermore, this configuration also offers a high level of tightness in the case of strongly fluctuating temperature ranges during operation of the stator, which are particularly common in automotive applications.

[0026] According to a further preferred development of the invention, it can also be provided that the contact areas each have a cylindrical ring-shaped contact surface, which also has a positive effect on the sealing effect.

[0027] Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that a first cylindrical contact surface has a first diameter that differs from a second diameter of the second cylindrical contact surface. In this context, it is particularly preferred that, in the axial direction, the smaller diameter lies in front of the larger diameter in the insertion direction of the first channel section, which simplifies assembly.

[0028] According to another particularly preferred embodiment of the invention, the cooling fluid inlet can be formed at the end of the first channel section facing away from the second channel section. Furthermore, the invention can also be further developed such that the cooling fluid inlet, the first channel section, and the second channel section are axially aligned with one another. The advantage of this configuration is that it allows for a particularly compact design of the irrigation device with a low pressure loss.

[0029] In a likewise preferred embodiment of the invention, the cooling fluid inlet can also be provided with a cylindrical ring-shaped third channel section that engages with a corresponding fourth channel section of a housing accommodating the stator. This allows the cooling fluid inlet to be easily inserted into a housing, which can also contribute to a high level of ease of assembly of the irrigation system.

[0030] It may also be advantageous to further develop the invention such that the fourth channel section has an inner circumferential surface and the third channel section has an outer circumferential surface. The inner circumferential surface and the outer circumferential surface are designed to define two axially spaced-apart, circumferentially annular contact regions against which the inner circumferential surface and the outer circumferential surface abut, and an annular space is defined axially between the annular contact regions. The advantage of this embodiment is the high degree of tightness combined with the ability to plug the cooling fluid inlet into a housing.

[0031] According to a further preferred embodiment of the subject matter of the invention, the second channel section can be connected to a fluid discharge channel, by means of which the cooling fluid is guided from the connecting channel, in particular to a transmission arrangement. This allows excess cooling fluid to be discharged from the irrigation device in a controlled manner. Furthermore, this can also provide a fluid connection for a transmission arrangement that is arranged in close proximity to the electric machine, such as in the axle drive train of a motor vehicle.

[0032] Finally, the invention can also be advantageously designed in such a way that a first connecting element extending in the axial direction is formed on the first part and a second connecting element extending in the axial direction is formed on the second part, which are connected to one another in a force-fitting, form-fitting and / or material-fitting manner, whereby the two halves of the irrigation device can be fixed and stabilized relative to one another.

[0033] The invention is explained in more detail below with reference to figures without limiting the general inventive concept.

[0034] It shows: Fig. 1 an electrical machine in a schematic cross-sectional view, Fig. 2 a two-part irrigation device in a disassembled and an assembled state, each in a perspective view, Fig. 3 an irrigation device in an axial section through the connecting channel, Fig. 4 a detailed view through the joint of the connecting channel and the joint of the cooling fluid inlet with the housing, each in an axial section, Fig. 5 a radial section view through the connecting channel, Fig. 6 an axial sectional view through the connecting elements of the irrigation device when installed in the electrical machine.

[0035] The Fig. 1 shows a stator 1 for an electrical machine 2, comprising a stator body 3 with a plurality of stator teeth 4 arranged in a circumferentially distributed manner and stator slots 5 formed between the stator teeth 4 and extending in the axial direction through the stator body 3, wherein stator windings 6 are arranged in the stator slots 5, which emerge axially on both sides from the stator body 3 to form a first winding head 12 and a second winding head 13, which can be seen from the synopsis of the Fig. 1 with the Fig. 6 becomes apparent.

[0036] In the direction of gravity above the first winding head 12 and the second winding head 13, these are at least partially covered by a sprinkling device 9 carrying a cooling fluid 8, which is formed in two parts from a first part 10 and a second part 11, which in the Fig. 2. A cooling fluid inlet 14 is formed on the first part 10 of the irrigation device 9, through which the cooling fluid 8 can be supplied to the irrigation device 9. For assembly reasons, it is advantageous if the irrigation device 9 for each of the two winding heads 12, 13 of the electrical machine 2 is mounted in the part 10, 11 facing the respective winding head 12, 13. This creates a joint between the two parts 10, 11 of the irrigation device 9.

[0037] The first part 10 has a circular-arc-shaped first irrigation channel 15 with first outlet openings 16 for the cooling fluid 8 directed toward the first winding head 12. The second part 11 of the irrigation device 9 also has a circular-arc-shaped second irrigation channel 17 with second outlet openings 18 for the cooling fluid 8 directed toward the second winding head 13. The first part 10 and the second part 11 are fluidly connected to one another by an axially extending connecting channel 19, so that the cooling fluid 8 can be distributed from the cooling fluid inlet 14 to the first irrigation channel 15 and the second irrigation channel 17.

[0038] The irrigation device 9 thus has a high-pressure and a low-pressure area, wherein a throttle opening 39 is formed between the high-pressure area and the low-pressure area, as can be seen from the Fig. 5. The high-pressure region, essentially defined by the connecting channel 19, preferably has a round cross-section perpendicular to the flow direction. The high-pressure region is connected to a cooling fluid circuit via a plug connection formed between the cooling fluid inlet 14 and the housing 7. The fluidic joint between the two parts 10, 11 of the irrigation device 9 is thus located in the high-pressure region of the irrigation device 9.

[0039] The connecting channel 19 is formed by a hollow cylindrical first channel section 20 formed in one piece with the first part 10 of the irrigation device 9 and a hollow cylindrical second channel section 21 formed in one piece with the second part 11 of the irrigation device 9, wherein the second channel section 21 surrounds the first channel section 20 at least in sections and rests against it, which is also clearly shown in the illustration in the Fig. 3 can be understood.

[0040] From the Fig. 3 and Figure b of the Fig. 4 it can be seen that the second channel section 21 has an inner circumferential surface 22 and the first channel section 20 has an outer circumferential surface 23, wherein the inner circumferential surface 22 and the outer circumferential surface 23 are designed such that they define two axially spaced-apart annular contact regions 24 in the circumferential direction, against which the inner circumferential surface 22 and the outer circumferential surface 23 bear and an annular space 25 is defined axially between the annular contact regions 24.

[0041] The contact regions 24 each have a cylindrical ring-shaped contact surface 26, wherein a first cylindrical ring-shaped contact surface 26 has a first diameter 27 which is different from a second diameter 28 of the second cylindrical ring-shaped contact surface 26.

[0042] At the joint between the first channel section 20 and the second channel section 21 of the two parts 10, 11 of the irrigation device 9, the two sealing points are stepped by the different diameters 27, 28 of the contact surfaces 26. This has the additional advantage when joining the two parts 10, 11 that threading is simplified by first inserting the small diameter 27 of the inner part into the large diameter 28 of the outer part with some play and thus without force. This already provides a certain guide length when creating the pressing, and the risk of buckling during joining is reduced. In addition, the sealing points on or around the contact surfaces can be sealed with a sealing ring (O-ring).

[0043] The channel section 20 located on the inside at the joint has a shoulder on its outer circumference, which, in conjunction with the end face of the outer channel section 21, acts as an axial stop. Alternatively, it would also be conceivable for the channel section 21 located on the outside at the joint to have a shoulder on its inner diameter, which, in conjunction with the end face of the inner channel section 20, acts as an axial stop.

[0044] The Fig. 2-3 further show that the cooling fluid inlet 14 is formed at the end of the second channel section 21 facing away from the first channel section 20. The cooling fluid inlet 14, the first channel section 20, and the second channel section 21 are axially aligned with one another, which simplifies plug-in assembly of the components. To seal the cooling fluid inlet 14 from the housing 7, the cooling fluid inlet 14 has a cylindrical ring-shaped third channel section 33, which engages in a corresponding fourth channel section 34 of a housing 7 accommodating the stator 1, which is also clearly visible in Figure a of the Fig. 4 can be understood.

[0045] The fourth channel section 34 has an inner circumferential surface 36 and the third channel section 33 has an outer circumferential surface 35, wherein the inner circumferential surface 36 and the outer circumferential surface 35 are designed such that they define two axially spaced-apart, circumferentially annular contact regions 37 against which the inner circumferential surface 36 and the outer circumferential surface 35 bear and an annular space 38 is defined axially between the annular contact regions 37.

[0046] The tightness at the two fluidic coupling points, first channel section 20 to second channel section 21 and third channel section 33 to fourth channel section 34, is thus increased by two linear compression points or contact areas 24, 37 both at the cooling fluid transfer point from the housing 7 to the cooling fluid inlet 14 and at the coupling point between the first channel section 20 and the second channel section 21. The paired linear compression points or contact areas 24, 37 formed in this way, with the annular space 25, 38 located axially between them, act here similarly to a labyrinth seal, so that sufficient tightness is ensured at the respective coupling point even with small gaps, such as those that can occur at low temperatures, for example. It has proven particularly advantageous if the compression points or contact areas 24, 37 have a circular cross-section.This allows ring stresses to build up in the components, making the pressing particularly effective.

[0047] It is evident from the Fig. 2-3 further that the second channel section 21 is connected to a fluid discharge channel 29, by means of which the cooling fluid 8 is guided from the connecting channel 19, in particular towards a gear arrangement 30.

[0048] Finally, the Fig. 2 and the Fig. 6 also shows that a first connecting element 31 extending in the axial direction is formed on the first part 10 and a second connecting element 32 extending in the axial direction is formed on the second part 11, which are connected to one another in a force-fitting and / or form-fitting manner.

[0049] Based on the Fig. 5 shows the throttle opening 39, which represents the transition from the high-pressure area to the low-pressure area of ​​the irrigation device 9 and which is arranged radially next to the cooling fluid inlet 14. This allows the component to be easily demolded during production, since no additional slide is required to demold the throttle opening 39. This arrangement of the cooling fluid inlet 14 and the throttle opening 39 then requires that the joint is larger in diameter than the cooling fluid inlet 14. In order to keep the joint as small as possible, the joint is arranged eccentrically to the cooling fluid inlet 14. In order to keep the flow losses during the transition from this small to the large diameter as low as possible, the transition is frustoconical, as can be clearly seen from the Fig. 3. The joint between the two parts 10, 11 of the irrigation device 9 is thus arranged eccentrically to the cooling fluid inlet 14.

[0050] From the overview of Fig. 2 with Fig.6 further shows that along the irrigation channels 15, 17 of the two parts 10, 11 of the irrigation device 9, which contain the low-pressure area, several fastening points are defined by the connecting elements 31, 32, which form a plug-in connection with one another. It is particularly advantageous if these plastic parts do not have to be fastened in the housing 7 by additional elements such as screws, but are simply plugged in. This gives rise to the difficulty that, due to the different thermal expansion coefficients, the prestressing of the plug-in connections between the connecting elements 31, 32 must not be lost under the influence of temperature. In addition, migration of the plug-in connection, e.g. due to vibrations, must be prevented.

[0051] In the illustrated embodiment, the plug-in connection between the connecting elements 31, 32 is formed from a pin-like second connecting element 32, which is received in a complementary hollow-cylindrical first connecting element 31. Further pin-like connecting elements 40 extend axially from the connecting elements 31, 32 toward the housing 7, where they engage in corresponding openings. The connecting elements 40, which are also pin-like, consist of a hollow-cylindrical body, on whose outer circumference there are several webs extending in the axial direction. The webs overlap with the openings in the housing 7. During assembly, the webs are then pressed radially inward. Due to the hollow-cylindrical shape of the pin-like connecting elements 40, the wall in the region of the webs is elastically pressed radially inward.This results in a non-circular shape, which stores deformation energy, which is retained to a certain extent even after the connection has been set under the influence of temperature. To support and secure the two parts 10, 11 of the irrigation system 9, it is advantageous if the connecting elements 31, 32 are positioned opposite each other with as little offset as possible, i.e., axially aligned.

[0052] The invention is not limited to the embodiments illustrated in the figures. The above description is therefore not to be considered restrictive, but rather explanatory. The following claims are to be understood in such a way that a stated feature is present in at least one embodiment of the invention. This does not exclude the presence of further features. Where the claims and the above description define 'first' and 'second' features, this designation serves to distinguish between two similar features without establishing a priority. List of reference symbols 1 stator 2 electric machine 3 Stator body 4 stator teeth 5 stator slots 6 stator windings 7 housings 8 Cooling fluid 9 Irrigation system Part 10 Part 11 12 winding head 13 Winding head 14 Cooling fluid inlet 15 Irrigation channel 16 outlet openings 17 Irrigation channel 18 outlet openings 19 connecting channel 20 canal section 21 Canal section 22 lateral surface 23 Shell surface 24 contact areas 25 annular space 26 Contact surface 27 diameters 28 diameter 29 Fluid drainage channel 30 Gear arrangement 31 connecting element 32 connecting element 33 Canal Section 34 canal section 35 lateral surface 36 lateral surface 37 contact areas 38 annular space 39 Throttle opening 40 fasteners

Claims

[1] Stator (1) for an electrical machine (2), comprising a stator body (3) with a plurality of stator teeth (4) arranged in a circumferentially distributed manner and stator slots (5) formed between the stator teeth (4) and extending in the axial direction through the stator body (3), wherein stator windings (6) are arranged in the stator slots (5), which emerge axially on both sides from the stator body (3) to form a first winding head (12) and a second winding head (13) and, in the direction of gravity above the first winding head (12) and second winding head (13), these are covered at least in sections by a sprinkling device (9) carrying a cooling fluid (8), which is formed in two parts from a first part (10) and a second part (11), and a cooling fluid inlet (14) is formed on the first part (10) or the second part (11) of the sprinkling device (9), through which the Cooling fluid (8) can be supplied to the irrigation device (9),and the first part (10) has a circular arc-like first irrigation channel (15) with first outlet openings (16) for the cooling fluid (8) directed towards the first winding head (12) and the second part (11) has a circular arc-like second irrigation channel (17) with second outlet openings (18) for the cooling fluid (8) directed towards the second winding head (13), wherein the first part (10) and the second part (11) are fluidically connected to one another by an axially extending connecting channel (19), so that the cooling fluid (8) can flow from the cooling fluid inlet (14) to the first, irrigation channel (15) and the second irrigation channel (17), characterized by , that the connecting channel (19) is formed by a hollow-cylindrical first channel section (20) formed integrally with the first part (10) of the irrigation device (9) and a hollow-cylindrical second channel section (21) formed integrally with the second part (11) of the irrigation device (9), wherein the second channel section (21) encompasses the first channel section (20) at least in sections and bears against it. [2] Stator (1) according to claim 1, characterized byin that the second channel section (21) has an inner circumferential surface (22) and the first channel section (20) has an outer circumferential surface (23), wherein the inner circumferential surface (22) and the outer circumferential surface (23) are designed such that they define two axially spaced-apart, circumferentially annular contact regions (24) against which the inner circumferential surface (22) and the outer circumferential surface (23) bear, and an annular space (25) is defined axially between the annular contact regions (24). [3] Stator (1) according to claim 2, characterized by that the contact areas (24) each have a cylindrical ring-shaped contact surface (26). [4] Stator (1) according to claim 3, characterized by that a first cylindrical ring-shaped contact surface (26) has a first diameter (27) which is different from a second diameter (28) of the second cylindrical ring-shaped contact surface (26). [5] Stator (1) according to one of the preceding claims, characterized bythat the cooling fluid inlet (14) is formed at the end of the first channel section (20) facing away from the second channel section (21). [6] Stator (1) according to one of the preceding claims, characterized by that the cooling fluid inlet (14), the first channel section (20) and the second channel section (21) are axially aligned with one another. [7] Stator (1) according to one of the preceding claims, characterized by that the cooling fluid inlet (14) has a cylindrical ring-shaped third channel section (33) which engages in a corresponding fourth channel section (34) of a housing (7) accommodating the stator (1). [8] Stator (1) according to claim 7, characterized byin that the fourth channel section (34) has an inner circumferential surface (35) and the third channel section (33) has an outer circumferential surface (36), wherein the inner circumferential surface (35) and the outer circumferential surface (36) are designed such that they define two axially spaced-apart, circumferentially annular contact regions (37) against which the inner circumferential surface (35) and the outer circumferential surface (36) bear, and an annular space (38) is defined axially between the annular contact regions (37). [9] Stator (1) according to one of the preceding claims, characterized by that the second channel section (21) is connected to a fluid discharge channel (29), by means of which the cooling fluid (8) is guided from the connecting channel (19), in particular towards a gear arrangement (30). [10] Stator (1) according to one of the preceding claims, characterized bythat a first connecting element (31) extending in the axial direction is formed on the first part (10) and a second connecting element (32) extending in the axial direction is formed on the second part (11), which are connected to one another in a force-fitting, form-fitting and / or material-fitting manner.

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