Stator for motor and motor

Abstract

The invention relates to a stator (1) for an electric machine. The stator (1) comprises a housing (2), which encloses a housing interior (3), and a plurality of stator laminations (4), which are arranged in the housing interior (3) and are stacked on one another in an axial direction (A), which together form a lamination stack (5) of the stator (1). The laminated core (5) is arranged radially at a distance from the housing (2) such that a fluid path (7) through which a cooling medium (K) can flow is formed by an intermediate space (6) formed between the housing (2) and the laminated core (5) in order to cool the stator (1). Furthermore, the stator (1) comprises a rib structure (9) for deflecting the cooling medium (K) when flowing through the fluid path (7), which rib structure is arranged on an outer periphery (11) of the laminated core (5), which outer periphery delimits the fluid path (7) on the radially inner side. In this case, the rib structure (9) comprises a plurality of ribs (10), which project radially outward from the laminated core (5) and project into the fluid path (7).

Description

Technical Field

[0001] The invention relates to a stator for an electric machine and an electric machine having such a stator. Background Art

[0002] Stators for electric machines usually have coil windings, by means of which a magnetic field can be generated for driving a rotor of the same machine by magnetic interaction. In addition, such stators usually include a so-called laminated core consisting of stator laminations stacked on top of one another, by means of which the magnetic field lines of the magnetic field generated by the stator can be influenced. This allows the coupling between the magnetic field generated by the stator and the magnetic field generated by the rotor to be optimized.

[0003] When the electric machine or the stator is in operation, in particular when the stator coils are energized, waste heat is generated which must be dissipated in order to prevent overheating and the attendant damage or even destruction of the stator. For this purpose, it is known to conduct a liquid or gaseous coolant through the stator laminations of the lamination stack, which absorbs the waste heat and thus dissipates it from the stator.

[0004] Against this background, US Pat. No. 10,158,263 B2 proposes forming recesses in the stator core, through which recesses a coolant, such as oil, can flow.

[0005] Similar devices for cooling a stator are known from CN 110808645 A, from WO 2021121360 A1 and from KR 20200102253 A.

[0006] All of these cooling devices have in common that they can only be realized technically with relatively little effort and are therefore associated with considerable additional costs. Summary of the invention

[0007] The object of the present invention is therefore to provide an improved embodiment for a stator for an electric machine in which the above-mentioned problems are solved. In particular, an improved stator is to be realized in which a cooling device for dissipating waste heat is provided, which is technically relatively simple in design and can therefore be realized cost-effectively.

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

[0009] Therefore, the basic idea of ​​the present invention is to provide a rib structure with a plurality of ribs on the outer periphery of a lamination stack formed by a plurality of stator laminations stacked on each other in the axial direction, wherein the plurality of ribs together with the housing of the stator define a fluid path through which a liquid or gaseous cooling medium can be guided, the cooling medium being in the form of a fluid, in particular oil. Here, the fluid path is delimited radially on the inside by the outer periphery of the lamination stack and can also be delimited radially on the outside by the inner periphery of the housing. That is, the outer periphery of the lamination stack is arranged radially at a distance from the housing of the stator, whereby the fluid path can constitute a cooling path or cooling channel.

[0010] By means of the ribs formed on the outer periphery of the lamination stack and extending into the fluid path according to the present invention, so-called flow guide elements are realized, which cause the cooling medium to be deflected when flowing through the fluid path. As a result, an improved thermal coupling of the cooling medium to the lamination stack or the material of the stator laminations constituting the lamination stack is caused. This is accompanied by an improved discharge of waste heat from the lamination stack or from the stator laminations to the cooling medium. In this way, efficient discharge of waste heat from the stator laminations to the cooling medium is achieved. Since the rib structure with ribs can be arranged on the outer periphery of the lamination stack in a technically simple manner, for example, these ribs are molded on each stator lamination in an integral manner, the fluid path can be realized in a technically simple manner by means of a desired, efficient coupling to the stator laminations.

[0011] Specifically, the stator for an electric motor according to the present invention includes a housing that surrounds an interior space of the housing. In addition, the stator includes a plurality of, i.e., at least three, stator laminations that are arranged in the interior space of the housing and stacked one on top of the other in the axial direction, preferably abutting one another in the axial direction, and that together constitute a stator lamination stack. At least one stator lamination can be formed by a sheet metal forming part made of metal. This enables the rib structure to be manufactured together, for example, by a stamping process, directly in the process of manufacturing the sheet metal forming part. Preferably, this applies to a plurality of or even all stator laminations of the lamination stack. Therefore, it is particularly suitable that the ribs of the rib structure can be formed on the lamination stack or on its stator laminations in an integral manner.

[0012] In the stator according to the invention, the lamination stack is arranged at a distance from the housing in the radial direction. Here, the radial direction extends perpendicularly to the axial direction, preferably away from the central longitudinal axis of the stator, which extends in the axial direction. As a result, a radial intermediate space is formed between the housing and the lamination stack, through which a coolant can flow for cooling the stator.

[0013] In a preferred embodiment of the invention, the ribs are in contact with the housing radially on the outside. As a result, the housing can form the radial outer boundary of the fluid path. Therefore, a separate limitation of the fluid path can be omitted, which is accompanied by cost advantages in manufacturing the stator.

[0014] Particularly preferably, at least one rib of the rib structure is formed on at least two different stator laminations of the lamination stack, thereby achieving a uniform deflection of the coolant.

[0015] Particularly preferably, the rib structure is arranged in a rib grid-like manner on the outer circumference of the laminated core. In this way, the cooling medium guided by the fluid path is deflected particularly frequently, thereby achieving a particularly effective thermal coupling to the stator laminated core.

[0016] In another preferred embodiment, a plurality of the ribs, preferably all of the ribs, are arranged on the outer circumference, so that the ribs divide the fluid path into a plurality of sub-fluid paths. By providing the sub-fluid paths, it is possible to achieve uniform distribution of the cooling medium to the fluid path and thus uniform heat dissipation from the lamination stack. This achieves uniform cooling of the stator laminations.

[0017] According to an advantageous embodiment of the stator according to the invention, at least one of the ribs, preferably a plurality of ribs, particularly preferably all of the ribs are designed in an elongated manner and extend in a longitudinal direction which extends along or parallel to the axial direction. Alternatively or additionally, in this embodiment, at least one of the ribs, preferably a plurality of ribs, particularly preferably all of the ribs are designed in a strip-like manner.

[0018] Particularly preferably, a plurality of ribs, preferably all ribs, of the rib structure are arranged at a distance from one another, in particular not only in the axial direction but also in the radial direction, thereby ensuring that the ribs do not impede the flow of the coolant through the fluid path too strongly, but at the same time ensure that the desired deflection of the coolant is achieved for the purpose of improving the heat absorption.

[0019] In a preferred embodiment, the distance between two ribs adjacent in the circumferential direction measured in the circumferential direction is at least twice, preferably at least three times, the width of at least one of the two ribs measured in the circumferential direction. This advantageously ensures that a sufficiently large intermediate space is provided between the individual ribs through which a coolant can flow.

[0020] According to an advantageous embodiment, at least two, preferably a plurality of first or second ribs of the rib structure are arranged at a distance from each other, preferably equidistant from each other, on at least one first stator lamination of the lamination stack and on a second stator lamination adjacent to the first stator lamination in the axial direction. In this embodiment, the first rib of the first stator lamination is arranged offset to the second rib of the second stator lamination in the circumferential direction of the stator. In this way, the coolant is deflected multiple times when flowing through the fluid path without being accompanied by excessive pressure losses in the coolant.

[0021] According to an advantageous development, the extension of the intermediate space between at least one first rib and a second rib adjacent to the first rib in the axial direction is at least 0.7 times, preferably at least 0.9 times, particularly preferably at least 1 times, the width of the first and / or second rib measured in the circumferential direction. “At least 1 times” is to be understood as meaning that the extension of the intermediate space has at least the same value as the width of the first or second rib. This development advantageously prevents the existing rib structure from impeding the flow through the fluid path too much and, in particular, from causing an excessive pressure drop in the coolant.

[0022] In another preferred embodiment, at least two first stator core plates and at least two second stator core plates follow one another in the axial direction. This variant is particularly simple in design and is therefore also particularly cost-effective.

[0023] Therefore, particularly preferably, the laminated core can consist of at least two first stator laminated cores and at least two second stator laminated cores.

[0024] In a preferred embodiment, the rib structure extends over the entire outer circumference of the laminated core, which supports an advantageously uniform distribution of the coolant over the stator laminate.

[0025] According to an advantageous embodiment, a fluid inlet for introducing a fluid into the fluid path and a fluid outlet for discharging the fluid from the fluid path after flowing through the fluid path are present on the housing. Alternatively or additionally, in this embodiment, the ribs of the rib structure are designed and coordinated with one another in such a way that the cooling medium flows from the fluid inlet to the fluid outlet along a main flow direction that runs along the axial direction or along a circumferential direction of the stator that runs perpendicular to the axial direction. In this way, the stator laminations of the lamination stack can be cooled particularly effectively.

[0026] Particularly preferably, the fluid inlet and the fluid outlet are arranged on opposite axial end sides of the stator, in particular of the housing, in the axial direction. This enables an axial flow through the intermediate space between the housing and the laminated core.

[0027] According to another advantageous embodiment, the fluid inlet and the fluid outlet are arranged at a distance from one another on the circumferential side of the stator, in particular the housing. This enables flow through the intermediate space between the housing and the laminated core in the circumferential direction.

[0028] In order to ensure that all outer circumferential sections of the laminated core are subjected to the desired cooling, the fluid inlet and the fluid outlet can particularly preferably be arranged at a distance from one another in the axial direction and / or in the circumferential direction.

[0029] According to an advantageous development of the stator according to the invention, the fluid inlet and the fluid outlet can be arranged opposite one another in the circumferential direction. This ensures a uniform flow of the coolant through the fluid path, in particular in the circumferential direction of the stator, wherein the rib structure ensures that the coolant is also distributed in the axial direction. The stator can thus be cooled particularly efficiently and uniformly in the axial direction and in the circumferential direction.

[0030] Alternatively or in addition thereto, the fluid inlet and the fluid outlet can be arranged at the same height in the axial direction. This can prove to be advantageous, in particular when the installation space is available to a limited extent. Alternatively thereto, the fluid inlet and the fluid outlet can also be arranged axially offset relative to one another. This ensures, in addition to the flow in the circumferential direction, an advantageous axial flow.

[0031] The invention further relates to an electric machine, in particular an externally excited synchronous machine. The electric machine comprises the above-described stator according to the invention and a rotor, which is arranged in the housing interior and can be magnetically coupled or is magnetically coupled to the stator. The rotor is designed to be rotatable relative to the stator about an axis of rotation, which extends in the axial direction. The advantages of the stator according to the invention explained above are therefore transferred to the electric machine according to the invention.

[0032] In a preferred embodiment of the electric machine according to the invention, the rotor is arranged at a radial distance from the rotation axis that is smaller than the radial distance from the rotation axis of the stator. In the case of such an electric machine designed as an internal rotor motor, it is ensured that the rotor does not block the structural space required for forming a fluid path between the outer circumference of the laminated core and the housing of the stator.

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

[0034] It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the respectively stated combination but also in other combinations or alone without departing from the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Preferred exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description, wherein identical reference numerals refer to identical or similar components or components having the same function.

[0036] The accompanying drawings schematically show:

[0037] Figure 1 An example of an electric machine according to the invention with an electric stator according to the invention is shown in longitudinal section,

[0038] Figure 2 Show Figure 1 A partial perspective view of the motor,

[0039] Figure 3 Shown in a separate figure Figure 1 The laminated core of the stator has a rib structure which is essential to the present invention. DETAILED DESCRIPTION

[0040] Figure 1 and 2 An example of an electric machine 30 according to the invention is shown, which may be an externally excited synchronous machine.

[0041] Here, Figure 1 Showing a longitudinal section, Figure 2 A partial perspective view is shown. The electric motor 30 comprises a stator 1 according to the present invention, which is shown as an example. The stator 1 comprises a housing 2, which surrounds a housing interior space 3. A rotor 20 is arranged in the housing interior space 3, which is configured to be rotatable relative to the stator 1 around an axis of rotation D, which extends along an axial direction A. For this purpose, the rotor 20 can include a rotor shaft 21, which is rotatably supported on the housing 2 of the stator 1 by means of a bearing device 22. A rotor coil that can be energized can be arranged on the rotor shaft 21 in a rotationally fixed manner for generating a rotor magnetic field. However, as an alternative to this, the arrangement of permanent magnets can also be considered.

[0042] In addition, the stator 1 includes a plurality of stator laminations 4, which are arranged in the housing interior 3 and are stacked on each other along the axial direction A and abut against each other in the axial direction, and together form a lamination stack 5 of the stator 1. The stator laminations 4 can each have an annular geometry in a plane perpendicular to the axial direction A. The axial direction A extends along the common central longitudinal axis M of the rotor 20 and the stator 1. The radial direction R extends perpendicularly to the axial direction A away from the central longitudinal axis M of the stator 1, and the circumferential direction U extends perpendicularly to the axial direction A and perpendicularly to the radial direction R around the central longitudinal axis M. The central longitudinal axis M forms the rotation axis D of the rotor shaft 21 and thus the entire rotor 20.

[0043] The annular stator laminations 4 can be arranged concentrically with the central longitudinal axis M. The stator laminations 4 can be formed by sheet metal forming parts. On the lamination stack 5 or on the stator laminations 4 of the lamination stack, on the radial inside, a stator coil (not shown) that can be energized can be constructed in a conventional manner for generating a stator magnetic field. For this purpose, a plurality of stator teeth (not shown) can be formed on the stator laminations on the radial inside along the circumferential direction U for carrying the coil windings constituting the stator coils.

[0044] according to Figure 1 and 2 The laminated core 5 with the stator laminated core 4 is arranged in a radially spaced manner from the housing 2 of the stator 1. Thus, a radial intermediate space 6 is formed between the housing 2 and the laminated core 5 by a fluid path 7 through which a coolant K can flow, for cooling the stator 1, and the fluid path preferably has a hollow cylindrical geometry.

[0045] In addition, according to Figure 2 The stator 1 comprises a rib structure 9 for deflecting the coolant K when flowing through the fluid path 7. The rib structure 9 is arranged on an outer circumference 11 of the laminated core 5 and extends over the entire outer circumference 11 of the laminated core 5 which delimits the fluid path 7 radially on the inside.

[0046] Here, the rib structure 9 includes a plurality of ribs 10, which protrude outward from the lamination stack 5 along the radial direction R and extend into the fluid path 7. The ribs 10 of the rib structure 9 are formed on the lamination stack 5 or on its stator lamination 4 in an integral manner. In other words, the corresponding stator lamination 4 and the ribs 10 arranged on the stator lamination 4 are constructed in one piece and with uniform materials. Here, the ribs 10 are arranged on the outer circumference 11 so that the ribs divide the fluid path 7 into a plurality of sub-fluid paths 7a. The ribs 10 form the boundaries of these sub-fluid paths 7a. In addition, in the example scenario, the ribs 10 are also attached to the housing 2 on the radial outside. Therefore, the housing 2 constructs the radial outer boundary of the fluid channel 7. With the help of the ribs 10 of the rib structure 9, the so-called flow guide element is realized, which causes the deflection of the cooling medium K when flowing through the fluid path 7.

[0047] Figure 3 In a separate illustration, a lamination stack 5 is shown with a rib structure 9. Thus, the ribs 10 of the rib structure 9 can be arranged in a raster-like manner on the outer circumference 11 of the lamination stack 5. Figure 3As can be seen in the figure, each rib 10 is constructed in an elongated shape and extends along a longitudinal direction L, which extends parallel to the axial direction A. Therefore, the rib 10 is constructed in a strip-like manner in the longitudinal direction L. In this example, all ribs 10 of the rib structure 9 are arranged with a spacing relative to each other not only in the axial direction but also in the radial direction. The length L of each rib 10 measured along the axial direction A is at least twice, preferably at least three times, the width B of the corresponding rib 10 measured along the circumferential direction U, that is, perpendicular to the axial direction A. The spacing A of two ribs 10 adjacent 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 two ribs 10 measured in the circumferential direction U.

[0048] Furthermore, in the exemplary scenario, each stator lamination 4 is formed by first and second stator laminations 4a, 4b, which alternately follow one another along the axial direction A and abut against one another in the axial direction. Axially adjacent stator laminations 4, 4a, 4b are electrically insulated from one another. Axially adjacent stator laminations 4, 4a, 4b can be bonded to one another, in particular by means of an electrically insulating bonding material, but can also be stamped and stacked. Other suitable connection types can also be used.

[0049] If in particular Figure 3 As can be seen in the diagram of , on the first stator laminate 4, 4a, a plurality of first ribs 10a of the rib structure 9 are arranged at intervals and equidistantly from one another along the circumferential direction U. Correspondingly, on the second stator laminate 4, 4a, a plurality of second ribs 10b of the rib structure 9 are arranged at intervals and equidistantly from one another along the circumferential direction U. In addition, the first ribs 10a of the first stator laminate 4, 4a are arranged offset with respect to the circumferential direction U of the stator 1 from the second ribs 10b of the second stator laminate 4b, 4.

[0050] An extension X of an intermediate space 23 between at least one first rib 10a and a second rib 10b axially adjacent thereto, measured along the circumferential direction U, is at least 0.7 times, preferably at least 0.9 times, particularly preferably at least 1 times, a width B of the first rib 10a measured along the circumferential direction U.

[0051] according to Figure 1On the housing 2, there may be a fluid inlet 12 for introducing a fluid into the fluid path 7 and a fluid outlet 13 for discharging the fluid from the fluid path 7 after the fluid flows through the fluid path. The fluid inlet 12 and the fluid outlet 13 are arranged at a distance from each other on the peripheral side 8 of the housing 2. The fluid inlet 12 and the fluid outlet 13 can be realized by notches 12a, 13a formed in the housing 2 on the peripheral side, and the intermediate space 6 forming the fluid path 7 is connected to the external environment 15 of the housing 2 via the notches. Figure 1 As shown, the fluid inlet 12 and the fluid outlet 13 can be opposite to each other in the circumferential direction U, that is, arranged relative to each other at a circumferential angle of 180° measured along the circumferential direction U. In addition, as shown, the fluid inlet 12 and the fluid outlet 13 can be arranged at the same height in the axial direction, but an offset arrangement with respect to the axial direction A is also possible (not shown).

[0052] The ribs 10 of the rib structure 9 are designed and coordinated with one another so that the cooling medium K can flow from the fluid inlet to the fluid outlet 13 along a main flow direction H, which extends along the circumferential direction U of the stator 1. In this example, the fluid inlet 12 and the fluid outlet 13 are arranged axially at the same height of the housing 2. However, it is also conceivable that the fluid inlet 12 and the fluid outlet 13 are arranged at a distance from one another in the axial direction A.

[0053] In another variant not shown in the figures, the fluid inlet 12 and the fluid outlet 13 can be arranged on opposite axial end sides 14a, 14b of the housing 2 in the axial direction A. In this case, the main flow direction H also extends parallel to the axial direction A.

[0054] In the example of the drawings, in the motor 30 , the rotor 20 is arranged at a radial distance from the rotation axis D smaller than the radial distance from the stator 1 to the rotation axis D, that is, the motor 30 is configured as a so-called inner rotor motor.

Claims

1. A stator (1) for an electric motor, The stator has a housing (2) which encloses a housing interior (3), The stator comprises a plurality of stator laminations (4), which are arranged in the housing interior (3) and are stacked one on top of the other in the axial direction (A), and which together form a lamination stack (5) of the stator (1), -in, The lamination stack (5) is arranged at a distance from the housing (2) in the radial direction, so that a fluid path (7) through which a cooling medium (K), in particular oil, can flow is formed via an intermediate space (6) formed between the housing (2) and the lamination stack (5) for dissipating waste heat from the stator (1). - The stator has a rib structure (9) for deflecting the cooling medium (K) when flowing through the fluid path (7), the rib structure being arranged on an outer circumference (11) of the laminated core (5), the outer circumference delimiting the fluid path (7) radially inwardly, wherein the rib structure (9) includes a plurality of ribs (10) which protrude radially outward from the laminated core (5) and extend into the fluid path (7).

2. The stator according to claim 1, It is characterized in that At least one of the ribs (10), preferably a plurality of ribs, particularly preferably all of the ribs, bears against the housing (2) on the radial outside.

3. The stator according to claim 1 or 2, It is characterized in that At least one rib (10) of the rib structure (9) is respectively formed on at least two different stator laminations (4) of the lamination stack (5).

4. The stator according to any one of claims 1 to 3, It is characterized in that The ribs (10) of the rib structure (9) are arranged in a grid-like manner on the outer circumference (11) of the laminated core (5).

5. A stator according to any one of the preceding claims, It is characterized in that A plurality of ribs, preferably all of the ribs (10) are arranged on the outer circumference (11), so that the ribs divide the fluid path (7) into a plurality of sub-fluid paths (7a).

6. A stator according to any one of the preceding claims, It is characterized in that at least one of the ribs (10), preferably a plurality of ribs, particularly preferably all of the ribs, is of elongated design and extends along a longitudinal direction (L), which extends along the axial direction (A), preferably parallel to the axial direction (A), or / and At least one of the ribs (10), preferably a plurality of ribs, particularly preferably all of the ribs, is designed in the form of a strip.

7. A stator according to any one of the preceding claims, It is 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 perpendicular to the axial direction (A), preferably along the circumferential direction (U).

8. A stator according to any one of the preceding claims, It is characterized in that A plurality of ribs, preferably all of the ribs (10) are arranged at a distance from one another in the axial direction and in the radial direction.

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

10. A stator according to any one of the preceding claims, It is characterized in that - on at least one first stator lamination (4, 4a) of the lamination stack (5) and on a second stator lamination (4b) axially adjacent to the first stator lamination (4, 4a), at least two, preferably a plurality of first ribs (10a) or second ribs (10b) of the rib structure (9) are arranged at a distance from one another, preferably equidistant from one another, in the circumferential direction (U) of the stator (1), The first rib (10a) of the first stator core (4a) is arranged offset with respect to the second rib (10b) of the second stator core (4b) in the circumferential direction (U) of the stator (1).

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

12. The stator according to claim 10 or 11, It is characterized in that - at least two first stator laminations and at least two second stator laminations (4a, 4b) follow one another along the axial direction (A); or / and The laminated core (5) consists of at least two first stator laminated cores and at least two second stator laminated cores (4a, 4b).

13. A stator according to any one of the preceding claims, It is characterized in that The rib structure extends over the entire outer circumference (11) of the lamination stack (5).

14. A stator according to any one of the preceding claims, It is characterized in that - a fluid inlet (12) for introducing the cooling medium (K) into the fluid path (7) and a fluid outlet (13) for discharging the cooling medium (K) from the fluid path (7) after flowing through the fluid path are present on the housing; or / and - The ribs (10) of the rib structure (9) are designed and coordinated with each other so that the cooling medium (K) flows from the fluid inlet to the fluid outlet (13) along a main flow direction (H), which extends along the axial direction (A) or along a circumferential direction (U) of the stator (1) extending perpendicularly to the axial direction (A).

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

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

17. A stator according to any one of claims 14 to 16, It is characterized in that The fluid inlet (12) and the fluid outlet (13) are arranged at a distance from one another in the axial direction (A) and / or in the circumferential direction (U).

18. A stator according to any one of claims 14 to 17, It is characterized in that - the fluid inlet (12) and the fluid outlet (13) are opposite 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 arranged offset relative to each other in the axial direction.

19. An electric machine (30), in particular an externally excited synchronous machine, A stator (1) according to any of the preceding claims and a rotor (20), which is arranged in the housing interior (3) and can be or is magnetically coupled to the stator (1), and is constructed in a manner that allows it to rotate relative to the stator (1) about an axis of rotation (D), the axis of rotation extending along an axial direction (A).

20. The machine according to claim 19, It is characterized in that The rotor (20) is arranged at a radial distance from the rotation axis (D) that is smaller than a radial distance from the stator (1) to the rotation axis.

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