STATOR FOR ELECTRIC MACHINE AND ELECTRIC MACHINE

Abstract

The present invention relates to a stator (1) for an electric machine. The stator (1) includes a housing (2) surrounding a housing interior (3) and a plurality of stator metal sheets (4) arranged in the housing interior (3) and stacked along an axial direction (A), the stator metal sheets (4) together forming a laminated core (5). The laminated core (5) is spaced apart radially from the housing (2), so that an intermediate space (6) formed between the housing (2) and the laminated core (5) defines a fluid path (7) through which a cooling medium (K) can flow for cooling the stator (1). The stator (1) further includes a rib structure (9) for deflecting the cooling medium (K) when the fluid path (7) flows. The rib structure (9) is arranged on an outer peripheral surface (11) of the laminated core (5) that defines the fluid path (7) radially inward. In this case, the rib structure (9) includes a plurality of ribs (10) that protrude radially outward from the laminated core (5) and extend into the fluid passage (7).

Description

[Technical Field]

[0001] The present invention relates to a stator for an electric machine as well as to an electric machine equipped with such a stator.

[0002] A stator for an electric machine typically carries coil windings that, through magnetic interaction, can be used to generate a magnetic field for driving a rotor of the same electric machine. Furthermore, such stators often include a so-called laminated core, made of stacked stator metal sheets, that can be used to influence the magnetic field lines of the magnetic field generated by the stator, thereby optimizing the coupling between the magnetic field generated by the stator and the magnetic field generated by the rotor.

[0003] During operation of the electric machine or stator, particularly when the stator coils are energized, waste heat is generated. This waste heat must be removed to prevent overheating of the stator and the resulting damage or even destruction. For this purpose, it is known to guide a liquid or gaseous cooling medium through the stator metal sheets of the laminated core, which absorbs the waste heat, and thus removes it from the stator.

[0004] In view of this background, US Patent No. 10,158,263 proposes forming a number of through holes in the stator sheet metal, through which a cooling medium, such as oil, can flow.

[0005] Similar mechanisms for cooling the stator are known from Chinese Patent Application Publication No. 110808645, International Publication No. 2021 / 121360 and Korean Patent Publication No. 2020-0102253.

[0006] What all these cooling mechanisms have in common is that they can only be implemented industrially with relatively little effort and are therefore associated with considerable additional costs.

[0007] It is therefore an object of the present invention to provide an improved design for a stator for an electric machine in which the above-mentioned problems apply, and in particular to provide an improved stator that is relatively simple to manufacture industrially and therefore inexpensive to implement, and that is provided with a cooling mechanism for removing the waste heat.

[0008] This problem is solved by the subject matter of the independent claims. Preferred embodiments are the subject matter of the dependent claims.

[0009] The basic idea of ​​the present invention is to provide a rib structure with a plurality of ribs on the outer circumferential surface of a laminated core formed by a plurality of axially stacked stator sheet metals. These ribs, together with the stator housing, define fluid channels through which a liquid or gaseous cooling medium, in particular in the form of oil, can be guided. In this case, the fluid channels can be defined radially inward by the outer circumferential surface of the laminated core and radially outward by the inner circumferential surface of the housing. That is, the outer circumferential surface of the laminated core is radially spaced apart from the stator housing, so that the fluid channels can form cooling channels or cooling passages.

[0010] The ribs formed on the outer periphery of the laminated core and projecting into the fluid channels according to the present invention form so-called flow guide elements that redirect the cooling medium when the fluid channels flow through them. This results in an improved thermal connection of the cooling medium with the material of the laminated core or the material of the stator sheets forming the laminated core. This results in an improved dissipation of waste heat from the laminated core or the stator sheets to the cooling medium. This results in an efficient dissipation of waste heat from the stator sheets to the cooling medium. The rib structure with ribs can be technically easily formed on the outer periphery of the laminated core, for example by integrally forming the ribs on the individual stator sheets, so that the fluid channels with the desired efficient thermal connection to the stator sheets can be technically easily realized.

[0011] Specifically, a stator according to the present invention for an electric machine includes a housing that surrounds a housing interior. The stator further includes a plurality of, i.e., at least three, stator metal sheets arranged in the housing interior and stacked along the axial direction, preferably in axial contact with one another, which together form a laminated core of the stator. At least one of the stator metal sheets can be formed from a sheet metal part made of metal. This allows the rib structure to be produced directly during the production of the sheet metal part, for example, by a stamping process. This applies preferably to several or even all of the stator metal sheets of the laminated core. Therefore, particularly expediently, the ribs of the rib structure can be integrally formed into the laminated core or its stator metal sheets.

[0012] In the stator according to the invention, the laminated core is radially spaced from the housing, the radial direction extending perpendicular to the axial direction and preferably extending away from the central longitudinal axis of the stator, which extends along the axial direction, such that a radial intermediate space is formed between the housing and the laminated core, through which a cooling medium can flow to cool the stator.

[0013] In a preferred embodiment of the present invention, the ribs contact the housing radially outward, which allows the housing to form a defining portion that defines the fluid passage radially outward, thereby eliminating the need for a separate defining portion for the fluid passage, which provides a cost advantage in manufacturing the stator.

[0014] Particularly preferably, at least one rib of the rib structure is formed in each of at least two stator metal sheets of the laminated core, so that a uniform deflection of the cooling medium can be achieved.

[0015] It is particularly preferred that the ribs of the rib structure are arranged in a grid pattern on the outer circumferential surface of the laminated core, in order to achieve particularly frequent redirection of the cooling medium guided by the fluid channels, thereby achieving particularly effective thermal coupling to the stator sheet metal.

[0016] In another preferred embodiment, a plurality of, preferably all, of the ribs are arranged on the outer circumferential surface so as to divide the fluid path into a plurality of partial fluid paths. By providing the partial fluid paths, uniform distribution of the cooling medium to the fluid paths can be achieved, and thus uniform heat dissipation from the laminated core can be achieved. This results in uniform cooling of the stator metal sheets.

[0017] In an advantageous refinement of the stator according to the invention, at least one, preferably several, particularly preferably all, of the ribs are elongated and extend along the axial direction or along a longitudinal direction parallel to the axial direction. Alternatively or additionally, in this refinement, at least one, preferably several, particularly preferably all, of the ribs can be designed in the form of a web.

[0018] Particularly preferably, several, preferably all, of the ribs of the rib structure are spaced apart from one another, in particular both axially and radially, in order to ensure that the ribs do not significantly impede the flow of the cooling medium through the fluid path, but at the same time ensure that the desired deflection of the cooling medium occurs for improved heat absorption.

[0019] In a preferred embodiment, the distance between two circumferentially adjacent ribs, measured along the circumferential direction, is at least twice, preferably at least three times, the width, measured perpendicular to the axial direction, preferably in the circumferential direction, of at least one of these ribs, which advantageously ensures that a sufficiently large intermediate space is provided between the individual ribs, also in the circumferential direction, through which the cooling medium can flow.

[0020] In an advantageous refinement, at least two of the ribs of the rib structure, preferably a plurality of first ribs or second ribs, are respectively arranged at a distance, preferably equidistant, from one another on at least one first stator sheet metal of the laminated core and on a second stator sheet metal axially adjacent to the first stator sheet metal. In this refinement, the first ribs of the first stator sheet metal are arranged offset relative to the second ribs of the second stator sheet metal in the circumferential direction of the stator. In this way, the cooling medium can be redirected multiple times during its flow through the fluid paths without excessively significant pressure losses in the cooling medium occurring at the same time.

[0021] In another advantageous refinement, the circumferential extension of the intermediate space between at least one first rib and a second rib axially adjacent to it is at least 0.7 times, preferably at least 0.9 times, and particularly preferably at least 1 time the circumferential width of the first and / or second rib. "At least 1 time" can be interpreted as meaning that the extension of the intermediate space is at least equal to the width of the first or second rib. This refinement is advantageous because it prevents the flow of the fluid path from being excessively obstructed by the existing rib structure and, in particular, from causing an excessively large pressure drop in the cooling medium.

[0022] In yet another preferred embodiment, the at least two first stator metal sheets and the at least two second stator metal sheets are contiguous with one another in the axial direction. This variant is particularly simple to manufacture and therefore particularly inexpensive.

[0023] Therefore, it is particularly preferable that the laminated core consists of these at least two first stator metal sheets and at least two second stator metal sheets.

[0024] In a preferred embodiment, the rib structure extends over the entire outer periphery of the laminated core, which promotes an advantageously uniform distribution of the cooling medium over the stator sheet metal.

[0025] In an advantageous refinement, the housing is provided with a fluid inlet for introducing the fluid into the fluid path and a fluid outlet for discharging the fluid from the fluid path after flowing through it. Alternatively or additionally, in this refinement, the ribs of the rib structure are configured and aligned with one another so that the cooling medium flows from the fluid inlet to the fluid outlet along a main flow direction that extends along the axial direction of the stator or along the circumferential direction of the stator that extends perpendicular to the axial direction. In this way, the stator metal sheets of the laminated core can be cooled particularly effectively.

[0026] It is particularly preferred that the fluid inlet and outlet are arranged on axially opposite end faces of the stator, in particular of the stator housing, which allows axial flow through the intermediate space between the housing and the laminated core.

[0027] In another advantageous refinement, the fluid inlets and outlets are arranged at a distance from one another on the circumferential side of the stator, in particular on the housing, which allows for the flow of fluid through the intermediate space between the housing and the laminated core in the circumferential direction.

[0028] In order to ensure that all outer peripheral surface sections of the laminated core are subjected to the desired cooling, the fluid inlet and outlet sections may be particularly preferably spaced apart from one another in the axial and / or circumferential direction.

[0029] In an advantageous refinement of the stator according to the invention, the fluid inlet and outlet can be located on opposite sides in the circumferential direction, thereby ensuring uniform flow of the cooling medium through the fluid paths, particularly along the circumferential direction of the stator, the rib structure ensuring that the cooling medium is also distributed in the axial direction, thereby allowing the stator to be cooled particularly efficiently and uniformly in both the axial and circumferential directions.

[0030] Alternatively or additionally, the fluid inlets and outlets can be arranged at the same height in the axial direction. This can prove to be advantageous, particularly when limited installation space is available. Alternatively, in another configuration, the fluid inlets and outlets can also be arranged offset from one another in the axial direction. This ensures favorable axial flow in addition to circumferential flow.

[0031] The present invention also relates to an electric machine, in particular a separately excited electric synchronous machine, which includes the stator according to the invention proposed above and a rotor arranged in a housing interior and magnetically coupleable or coupled to the stator. The rotor is in this case configured to be rotatable relative to the stator about an axially extending rotation axis. The previously described advantages of the stator according to the invention therefore also apply to the electric machine according to the invention.

[0032] In a preferred embodiment of the electric machine according to the invention, the rotor is radially spaced closer to the axis of rotation than the stator. In such an electric machine configured as an "inner rotor," it is ensured that the rotor does not block the construction space required to form a fluid path between the outer surface of the laminated core and the housing of the stator.

[0033] Further important features and advantages of the invention emerge from the dependent claims, the drawings and the associated description of the drawings.

[0034] Of course, the features mentioned above and those that may be further described below can be used not only in the combinations described respectively, but also in other combinations or alone, without departing from the scope of the invention.

[0035] A preferred embodiment of the invention is illustrated in the drawings and will be explained in detail in the following description, in which the same reference numerals refer to the same or similar components or components that are the same in terms of functionality. [Brief explanation of the drawings]

[0036] [Figure 1] 1 is a longitudinal section through an example of an electric machine according to the invention, equipped with an electric stator according to the invention; [Figure 2] FIG. 2 is a perspective view of a portion of the electric machine shown in FIG. [Figure 3] 2 is a separate view of the laminated core of the stator shown in FIG. 1, including the rib structure important to the present invention.

[0037] 1 and 2 show an example of an electric machine 30 according to the invention, which may be a separately excited electric synchronous machine.

[0038] FIG. 1 shows a longitudinal section, and FIG. 2 shows a partial perspective view. The electric machine 30 includes a stator 1 according to the invention, which is shown by way of example. The stator 1 includes a housing 2 that encloses a housing interior 3. A rotor 20 is arranged in the housing interior 3. The rotor 20 is configured to be rotatable relative to the stator 1 about a rotation axis D that extends along the axial direction A. For this purpose, the rotor 20 may include a rotor shaft 21, which is rotatably supported in the housing 2 of the stator 1 by means of a bearing device 22. An electrically energizable rotor coil for generating a rotor magnetic field may be arranged on the rotor shaft 21 in a non-rotatable manner. However, as an alternative to this, it is also conceivable to arrange a permanent magnet thereon.

[0039] The stator 1 further includes a plurality of stator metal sheets 4 arranged in the housing interior 3 and stacked along the axial direction A in axial contact with one another, the stator metal sheets 4 together forming a laminated core 5 of the stator 1. The stator metal sheets 4 may each have an annular geometric shape in a plane perpendicular to the axial direction A. The axial direction A extends along a common central longitudinal axis M of the rotor 20 and the stator 1. A radial direction R extends perpendicular to the axial direction A, away from the central longitudinal axis M of the stator 1, and a circumferential direction U extends perpendicular to the axial direction A and radial direction R, around the central longitudinal axis M. The central longitudinal axis M forms the rotational axis D of the rotor shaft 21, and thus the rotational axis D of the entire rotor 20.

[0040] The annular stator metal sheets 4 may each be arranged concentrically about a central longitudinal axis M. The stator metal sheets 4 may be formed from formed sheet metal parts. The laminated core 5 or its stator metal sheets 4 may be formed radially inward in a conventional manner with electrically conductive stator coils (not shown) for generating a stator magnetic field. For this purpose, the stator metal sheets may be formed radially inward along the circumferential direction U with a plurality of stator teeth (not shown) for supporting coil windings forming the stator coils.

[0041] 1 and 2, the laminated core 5 with the stator metal sheets 4 is radially spaced apart from the housing 2 of the stator 1. Between the housing 2 and the laminated core 5, a radial intermediate space 6 thereby forms a fluid path 7 through which a cooling medium K can flow in order to cool the stator 1, which fluid path 7 preferably has a hollow cylindrical geometry.

[0042] 2, the stator 1 further includes a rib structure 9 for redirecting the cooling medium K when it flows through the fluid path 7. The rib structure 9 is arranged on the outer circumferential surface 11 of the laminated core 5, which defines the fluid path 7 radially inward, and extends over the entire outer circumferential surface 11 of the laminated core 5.

[0043] In this case, the rib structure 9 includes a plurality of ribs 10 that protrude outward from the laminated core 5 along the radial direction R and extend into the fluid passage 7. The ribs 10 of the rib structure 9 are integrally formed with the laminated core 5 or its stator metal sheets 4. In other words, each stator metal sheet 4 and the ribs 10 provided on the stator metal sheets 4 are formed integrally and from a single material. In this case, the ribs 10 are arranged on the outer circumferential surface 11 so as to divide the fluid passage 7 into a plurality of partial fluid passages 7a. The ribs 10 form a boundary that defines the partial fluid passages 7a. In this embodiment, the ribs 10 also contact the housing 2 radially outward. Thus, the housing 2 forms a boundary that defines the fluid passage 7 radially outward. The ribs 10 of the rib structure 9 form so-called flow guide elements that redirect the cooling medium K when it flows through the fluid passage 7.

[0044] FIG. 3 separately illustrates a laminated core 5 having a rib structure 9. As shown in FIG. 3, the ribs 10 of the rib structure 9 may be arranged in a grid pattern on the outer peripheral surface 11 of the laminated core 5. As can be further seen from FIG. 3, each rib 10 is elongated and extends along a longitudinal direction L parallel to the axial direction A. Thus, the ribs 10 are formed like a web in the longitudinal direction L. In this embodiment, all of the ribs 10 of the rib structure 9 are spaced apart from one another in both the axial and radial directions. The length L of each rib 10, measured along the axial direction A, is at least twice, and preferably at least three times, the width B of each rib 10, measured along the circumferential direction U, i.e., perpendicular to the axial direction A. The spacing A between two adjacent ribs 10 in the circumferential direction U, measured along the circumferential direction U, is at least twice, and preferably at least three times, the width B, measured in the circumferential direction U, of at least one of these ribs 10.

[0045] In this embodiment, each stator metal sheet 4 is further formed by a first stator metal sheet 4a and a second stator metal sheet 4b, which are alternately arranged in succession along the axial direction A and are in contact with each other in the axial direction. Axially adjacent stator metal sheets 4, 4a, 4b are electrically insulated from each other. Axially adjacent stator metal sheets 4, 4a, 4b may be bonded to each other, in particular by an electrically insulating adhesive, but may also be interlocked. Other suitable joining methods may also be used.

[0046] 3, the first stator metal sheets 4, 4a each have a plurality of first ribs 10a of the ribs 10 of the rib structure 9 spaced apart and equidistant from one another along the circumferential direction U. Correspondingly, the second stator metal sheets 4, 4a each have a plurality of second ribs 10b of the ribs 10 of the rib structure 9 spaced apart and equidistant from one another along the circumferential direction U. Furthermore, the first ribs 10a of the first stator metal sheets 4, 4a are offset relative to the second ribs 10b of the second stator metal sheets 4b, 4 in the circumferential direction U of the stator 1. The extension length X, measured along the circumferential direction U, of the intermediate space 23 between at least one first rib 10a and a second rib 10b axially adjacent to this first rib 10b is at least 0.7 times, preferably at least 0.9 times, particularly preferably at least 1 time, the width B, measured along the circumferential direction U, of the first rib 10a.

[0047] As shown in FIG. 1 , the housing 2 may be provided with a fluid inlet 12 for introducing fluid into the fluid path 7 and a fluid outlet 13 for discharging the fluid from the fluid path 7 after flowing through the fluid path 7. The fluid inlet 12 and the fluid outlet 13 are spaced apart from each other on the circumferential side 8 of the housing 2. The fluid inlet 12 and the fluid outlet 13 may be realized by through-holes 12 a, 13 a formed in the housing 2 on the circumferential side, through which the intermediate space 6 forming the fluid path 7 is in fluid communication with the environment 15 outside the housing 2. As shown in FIG. 1 , the fluid inlet 12 and the fluid outlet 13 may be located on opposite sides of the circumferential direction U, i.e., may be arranged at an angle of 180° measured along the circumferential direction U relative to each other. Furthermore, the fluid inlet 12 and the fluid outlet 13 may be arranged at the same height in the axial direction as shown, but an offset arrangement (not shown) with respect to the axial direction A is also possible.

[0048] The ribs 10 of the rib structure 9 are formed and aligned with one another so that the coolant K can flow from the fluid inlet 12 to the fluid outlet 13 in a main flow direction H extending along the circumferential direction U of the stator 1. In this embodiment, the fluid inlet 12 and the fluid outlet 13 are arranged at the same height in the axial direction of the housing 2. However, it is also conceivable to arrange the fluid inlet 12 and the fluid outlet 13 at a distance from one another in the axial direction A.

[0049] In another variant not shown in the drawings, the fluid inlet 12 and the fluid outlet 13 can also be arranged on opposite axial end faces 14a, 14b of the housing 2 along the axial direction A. In this case, the main flow direction H also extends parallel to the axial direction A.

[0050] In the illustrated embodiment, the rotor 20 in the electric machine 30 is arranged at a smaller radial distance from the axis of rotation D than the stator 1. In other words, the electric machine 30 is configured as a so-called inner rotor.

Claims

1. A stator (1) for an electric machine, comprising: a housing (2) surrounding a housing interior (3); a plurality of stator metal sheets (4) arranged in the housing inner chamber (3) and stacked along the axial direction (A), the stator metal sheets (4) together forming one laminated core (5) of the stator (1); Equipped with The laminated core (5) is radially spaced from the housing (2), so that an intermediate space (6) formed between the housing (2) and the laminated core (5) forms a fluid path (7) through which a cooling medium (K), in particular oil, can flow in order to remove heat from the stator (1), a rib structure (9) for redirecting the cooling medium (K) when the cooling medium (K) flows through the fluid path (7), the rib structure (9) being arranged on an outer peripheral surface (11) of the laminated core (5) that defines the fluid path (7) on the radially inner side, and the rib structure (9) including a plurality of ribs (10) that protrude from the laminated core (5) radially outward and extend into the fluid path (7); A stator (1) for an electric machine.

2. 2. A stator according to claim 1, characterized in that at least one, preferably several, particularly preferably all, of the ribs (10) are in radially outer contact with the housing (2).

3. 3. The stator according to claim 1, wherein at least one rib (10) of the rib structure (9) is formed on each of at least two types of stator thin metal plates (4) of the laminated core (5).

4. 4. The stator according to claim 1, wherein the ribs (10) of the rib structure (9) are arranged in a grid pattern on the outer circumferential surface (11) of the laminated core (5).

5. 5. A stator according to claim 1, wherein a plurality of, preferably all of, the ribs (10) are arranged on the outer circumferential surface (11) so that the ribs (10) divide the fluid path (7) into a plurality of partial fluid paths (7a).

6. At least one, preferably several, particularly preferably all, of the ribs (10) are elongated and extend along an axial direction (A), preferably along a longitudinal direction (L) extending parallel to the axial direction (A), and / or At least one, preferably several, particularly preferably all, of the ribs (10) are formed in a web-like shape.

6. A stator according to any one of claims 1 to 5, characterized in that it comprises:

7. 7. A stator according to any one of claims 1 to 6, characterized in that the length (L) of at least one rib (10), preferably of a plurality of ribs (10), particularly preferably of all ribs (10) of the rib structure (9), measured along the axial direction (A), is at least twice, preferably at least three times, the width of the rib (10), measured in a direction perpendicular to the axial direction (A), preferably along the circumferential direction (U).

8. A stator according to any one of the preceding claims, characterized in that a plurality of, preferably all of, said ribs (10) are spaced apart from one another in the axial and radial directions.

9. 9. A stator according to any one of claims 1 to 8, characterized in that the distance (A) between two adjacent ribs (10) in the circumferential direction (U), measured along the circumferential direction (U), is at least twice, preferably at least three times, the width (B) of at least one of the ribs (10), measured in the circumferential direction (U).

10. At least two of the ribs (10) of the rib structure (9), preferably a plurality of first ribs (10a) or second ribs (10b), are arranged on at least one first stator metal sheet (4, 4a) of the laminated core (5) and on a second stator metal sheet (4b) axially adjacent to the first stator metal sheet (4, 4a), respectively, at intervals, preferably equidistant, from one another along the circumferential direction (U) of the stator (1); the first ribs (10a) of the first stator metal sheet (4a) are arranged offset relative to the second ribs (10b) of the second stator metal sheet (4b) in the circumferential direction (U) of the stator (1); 10. A stator according to any one of claims 1 to 9, characterized in that it comprises:

11. 11. A stator according to claim 10, characterized in that the extension length (X), measured along the circumferential direction (U), of the intermediate space (23) between at least one first rib (10a) and an adjacent second rib (10b) arranged offset with respect to said first rib (10a) is at least 0.7 times, preferably at least 0.9 times, particularly preferably at least 1 time, the width (B), measured along the circumferential direction (U), of said first and / or second rib (10a, 10b, 10).

12. the at least two first stator metal sheets (4a) and the at least two second stator metal sheets (4b) are continuous with each other along the axial direction (A); and / or The laminated core (5) comprises the at least two first stator metal sheets (4a) and the at least two second stator metal sheets (4b).

12. A stator according to claim 10 or 11, characterized in that:

13. 13. A stator according to any one of claims 1 to 12, characterized in that the rib structure extends over the entire outer circumferential surface (11) of the laminated core (5).

14. The housing is provided with a fluid inlet (12) for introducing a cooling medium (K) into the fluid path (7) and a fluid outlet (13) for removing the cooling medium (K) from the fluid path (7) after it has passed through the fluid path (7), and / or The ribs (10) of the rib structure (9) are formed and adjusted to each other so that the cooling medium (K) flows from the fluid inlet to the fluid outlet (13) along a main flow direction (H) extending along the axial direction (A) of the stator (1) or along a circumferential direction (U) of the stator (1) extending perpendicular to the axial direction (A).

14. A stator according to any one of claims 1 to 13, characterized in that it comprises a stator.

15. 15. The stator according to claim 14, characterized in that the fluid inlet (12) and the fluid outlet (13) are arranged on axial end face sides (14a, 14b) of the stator (1), in particular of the housing (2), that are located on opposite sides along the axial direction (A).

16. 16. The stator according to claim 14 or 15, characterized in that the fluid inlet (12) and the fluid outlet (13) are arranged at a distance from each other on the circumferential side (8) of the stator (1), in particular of the housing (2).

17. 17. A stator according to any one of claims 14 to 16, characterized in that the fluid inlet (12) and the fluid outlet (13) are spaced apart from each other in the axial (A) and / or circumferential (U) direction.

18. The fluid inlet (12) and the fluid outlet (13) are located on opposite sides of each other in the circumferential direction (U); and The fluid inlet (12) and the fluid outlet (13) are arranged at the same height in the axial direction or are offset from each other in the axial direction.

18. Stator according to any one of claims 14 to 17, characterized in that it comprises a stator.

19. An electric machine (30), in particular a separately excited electric synchronous machine, The invention comprises a stator (1) according to any one of claims 1 to 18, and a rotor (20) arranged in the housing inner chamber (3) and capable of being magnetically coupled to the stator (1), the rotor (20) being rotatable relative to the stator (1) about a rotation axis (D) extending along the axial direction (A). Electric machine (30).

20. 20. An electric machine according to claim 19, characterized in that the rotor (20) is spaced radially from the axis of rotation (D) at a smaller distance than the stator (1).

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