DE102024206275A1 - Stator with cooling openings, electric machine and motor vehicle - Google Patents

Abstract

The present invention relates to a stator (1) for an electric machine (2) for powering a motor vehicle (3). The stator (1) has a stator lamination stack (5) made up of stator lamination disks (6, 6a, 6b, 6c), which is held together by fastening screws (12) with coolant lines (13) and first outlet openings (14). According to the invention, the stator lamination disks (6, 6a, 6b, 6c) are aligned with each other such that first openings (15) are formed through which coolant flowing from the first outlet openings (14) can be directed to a stator back of the stator (1). The invention further relates to an electric machine (2) and a motor vehicle (3).

Description

The present invention relates to a stator for an electric machine for powering a motor vehicle. The invention further relates to an electric machine for powering a motor vehicle and to a motor vehicle with an electric drive system.

Stators for electric motor vehicles are known in which cooling devices are provided for cooling the stator. These cooling devices include coolant lines for conveying a coolant, in particular a cooling liquid, which are designed, for example, as coolant pipes, especially made of steel. A coolant, such as cooled oil, can be directed via these coolant lines to a specific point on the stator and to the winding heads of a stator winding. For this purpose, the coolant pipes can be coupled to one or more spray nozzles for atomizing the coolant.

The document DE 10 2019 215 693 A1 Disclosing a stator in which the coolant lines are formed by hollow screws, the coolant can be conveyed axially through the stator via these hollow screws. The coolant line extends along the longitudinal axis of the hollow screw and has an inlet opening at one screw tip for introducing the coolant and an outlet opening at one screw head end for releasing the coolant. Heat transfer between the coolant and the hollow screw is thus provided via a screw wall of the hollow screw.

From the documents JP 6 833 652 B2 and JP 6 767 962 B2 Stators are known that also feature hollow screws for guiding a coolant. The stator can be attached to the housing of an electric machine via these hollow screws. The coolant line has a first outlet opening extending radially in the screw head region of the hollow screw. An intermediate washer with a radially extending outlet bore, located at the first outlet opening, ensures the controlled flow of coolant from the outlet opening along a longitudinal axis of the stator. Furthermore, several coolant channels are formed in a central stator lamination disk of a stator lamination stack, extending from a screw bore to a stator lamination back of the stack. To provide coolant to the central stator lamination disk, the hollow screw has a second outlet opening extending radially.

Common stators suffer from the disadvantage of often inadequate cooling and sometimes very complex manufacturing processes. The inclusion of intermediate stator laminations within the stator core, which differ in design from the other laminations, along with additional intermediate laminations featuring exhaust holes, increases the number of parts and complicates assembly. Furthermore, the additional cooling channels in the stator laminations negatively impact the magnetic flux through the stator core, thus reducing the stator's performance.

It is therefore an object of the present invention to eliminate, or at least partially eliminate, the disadvantages described above in a stator for an electric motor for powering a motor vehicle. In particular, it is an object of the present invention to provide a stator for an electric motor for powering a motor vehicle, an electric motor for powering a motor vehicle, and a motor vehicle with an electric drive system that, in a simple and cost-effective manner, have a reduced number of differently designed parts and/or provide improved cooling of the stator.

The aforementioned problem is solved by the claims. Accordingly, the problem is solved by a stator for an electric machine for driving a motor vehicle with the features of independent claim 1, by an electric machine for driving a motor vehicle with the features of dependent claim 9, and by a motor vehicle with an electric drive system with the features of dependent claim 10. Further features and details of the invention will become apparent from the dependent claims, the description, and the drawings. Features and details described in connection with the stator according to the invention naturally also apply in connection with the electric machine and the motor vehicle according to the invention, and vice versa, so that the disclosure regarding the individual aspects of the invention always makes, or can make, reciprocal references.

According to a first aspect of the invention, the problem is solved by a stator for an electric machine for driving a motor vehicle. The stator has a stator lamination stack extending along a longitudinal stator axis, consisting of several coaxially arranged stator laminations. The stator laminations consist of several stator slots formed in the stator lamination stack and a stator winding arranged in the stator slots. Several screw areas with a central through-hole are arranged circumferentially distributed on the stator laminations such that the central through-holes form a common mounting passage for a mounting screw. A first mounting screw is arranged in a mounting passage, which has a coolant line for conveying coolant, wherein the coolant line has a first outlet opening for releasing the coolant in a central screw area of the first mounting screw. A second stator lamination is arranged between a first stator lamination and a third stator lamination. According to the invention, the stator laminations are arranged relative to each other such that the common mounting passage has a first opening in the radial direction between the first stator lamination and the third stator lamination.

The stator lamination stack is composed of stator lamination disks arranged coaxially to the stator's longitudinal axis. The stator lamination disks preferably comprise or are formed from electrical steel. Furthermore, the stator lamination disks preferably have electrical insulation on their base surfaces, such as a coating, varnish, or the like. Thus, adjacent stator lamination disks are electrically insulated from one another. Preferably, the stator lamination disks are completely surrounded by electrical insulation. Alternatively or additionally, an electrical insulator, such as paper or the like, can be arranged between two stator lamination disks.

Each stator lamination disk has several slots formed, which, when the stator core is assembled, are aligned with each other, thus forming the stator slots. The stator winding is arranged in these slots. The stator winding is multiphase, preferably three-phase. At each end face of the stator core, the stator winding has a winding head. The stator winding can consist of several continuous wires or hairpins, such as I-pins or U-pins. The stator winding preferably has copper with an electrical sheath.

The stator laminations each have several screw areas, each with a central through-hole. These screw areas preferably project radially beyond adjacent circumferential areas of the stator lamination. This ensures that the fastening screws have a minimal impact on the magnetic flux through the stator core. In the assembled state of the stator lamination stack, the central through-holes are arranged coaxially with the central through-holes of the screw areas of other stator laminations within the stack. This coaxial arrangement of the central through-holes forms the common mounting points.

The stator laminations are preferably pressed together to form the lamination stack and/or held together as the stator core by means of common mounting holes. According to the invention, the stator core can be held to a machine housing of the electric machine by means of the mounting screws.

Each of the common mounting holes has a mounting screw. At least one of these mounting screws is designed as the first mounting screw. This is preferably a mounting screw that, in the installed state of the electric machine, is located above the rotor of the electric machine. Preferably, several of the mounting screws are designed as the first mounting screw. Particularly preferably, the stator has three mounting screws. More preferably, all mounting screws are designed as the first mounting screw.

The first fastening screw has a coolant line for conveying the coolant. The coolant line is preferably designed as a central channel extending coaxially to the longitudinal axis of the fastening screw. The coolant line preferably has a round or oval cross-section. The first outlet opening is located in the central area formed between the screw head and the screw base of the fastening screw. The first outlet opening is fluidly coupled to the coolant line. Preferably, the first outlet opening is formed by a bore extending from the outside to the coolant line transversely to the longitudinal axis of the screw. According to the invention, the bore can terminate in the coolant line or extend through the coolant line and form a second outlet opening on the side of the fastening screw opposite the first outlet opening for releasing the coolant. Accordingly, the bore can be designed as a blind hole or a through hole. Furthermore, the first fastening screw has Preferably, an inlet opening is provided for introducing the coolant into the coolant line. The inlet opening can be formed, for example, in the screw head area and/or in the screw base area, so that, according to the invention, two inlet openings can also be provided at opposite screw ends.

The second stator lamination is arranged between the first and third stator laminations. According to the invention, several first stator laminations and/or several second stator laminations and/or several third stator laminations can be provided. According to the invention, the stator laminations are arranged relative to one another such that the common mounting passage between the first and third stator laminations has a first opening in the radial direction. In other words, the common mounting passage in the region of the second stator lamination or the multiple second stator laminations is designed such that coolant flowing from the common mounting passage or the first outlet opening of the first mounting screw can flow to a stator back of the stator lamination stack.

The first opening preferably extends radially outwards. The first opening is preferably formed by an arrangement of the first, second, and third stator lamination disks such that the second stator lamination disk has no screw area between the screw area of the first stator lamination disk and the screw area of the third stator lamination disk. Preferably, the second stator lamination disk has a design similar to the majority of its circumference in the area of the first opening. Alternatively, the second stator lamination disk can have a circumferentially and/or radially oriented clearance at the screw area in the area of the opening, through which the central passage to the stator back is open.

A stator according to the invention has the advantage over conventional stators that a particularly advantageous and efficient cooling of the stator lamination stack can be achieved using simple means and in a cost-effective manner. The coolant flowing through the coolant line can also be directed to the back of the stator via the first opening, thus enabling targeted cooling of this area. Furthermore, by appropriately designing the stator lamination disks, the number of disk variants can be reduced to such an extent that only a single disk design is required to manufacture the stator lamination stack of the stator according to the invention. Moreover, the stator according to the invention has a compact design, a reduced installation space requirement, and a lower overall weight than conventional stators.

According to a preferred embodiment of the invention, the screw areas formed in the stator laminations can be configured as screw eyes extending radially outwards. Within the scope of the invention, a screw eye is understood to be a device having a round or oval wall that fully or partially surrounds the central opening. According to the invention, the screw eye can be at least partially integrated into an annular core area of the stator lamination and project radially outwards from this core area. Transition areas between the annular core area and the screw eye are preferably rounded. The stator laminations are preferably arranged such that the second stator lamination has no screw eye between a screw eye of the first stator lamination and a screw eye of the third stator lamination. This has the advantage of providing particularly effective and efficient cooling of the stator lamination stack using simple and cost-efficient means.

According to the invention, it is preferred that the center distance of the central axis of the central passage to the longitudinal axis of the stator corresponds to, or is greater than, the outer radius of the stator lamination disk formed outside the screw areas. In other words, it is preferred that the central passage of the screw area extends approximately halfway into the annular core area and halfway into the radially outwardly projecting area of the screw eye, or is arranged further outwards in the radial direction. This has the advantage that a particularly advantageous and efficient cooling of the stator lamination stack is provided using simple and cost-effective means. Furthermore, the influence of the fastening screws on the magnetic flux of the stator lamination stack is reduced.

Preferably, the first outlet opening is arranged in the area of the first opening. The first fastening screw is therefore preferably designed such that the first outlet opening, and preferably also any second outlet opening provided, have an overlap area with the first opening in the axial direction of the stator. Preferably, the first outlet opening and the first opening are located on the same The coolant is arranged in the axial position of the stator or in an axial position adjacent to it. This ensures that coolant can flow directly from the coolant line through the first outlet opening and the first opening to the back of the stator. This has the advantage of providing particularly effective and efficient cooling of the stator lamination stack in a simple and cost-efficient manner.

In a particularly preferred embodiment of the invention, a stator can be provided with two screw areas, wherein the screw areas are spaced 120° apart circumferentially, and the second stator lamination is oriented at a 120° angle relative to the first stator lamination. Within the scope of the invention, a circumferential distance is understood to be an angle about the longitudinal axis of the stator formed between two radii directed towards the respective central feedthroughs. Within the scope of the invention, a relative rotation is understood to be a rotation about the longitudinal axis of the stator. The first and third stator laminations can, for example, have the same orientation. Alternatively, the third stator lamination can be oriented 120° in the opposite direction to the first stator lamination compared to the second stator lamination. In this way, several first openings can be formed. This has the advantage that a particularly advantageous and efficient cooling of the stator lamination stack is provided in a simple and cost-effective manner.

Preferably, the stator laminations are arranged such that several common mounting holes, each with a first opening, are formed circumferentially. In other words, the stator lamination stack has several common mounting holes distributed circumferentially, with two or more of the common mounting holes having a first opening. Preferably, the first openings are spaced apart axially. Particularly preferably, each of the common mounting holes has a first opening. A first mounting screw is preferably arranged in each of the common mounting holes with a first opening, with the first outlet opening preferably located axially at the same level as the first opening or directly adjacent to the first opening. An additional first opening allows for better distribution of the coolant on the back of the stator. This has the advantage that a particularly effective and efficient cooling of the stator lamination stack is provided in a simple and cost-efficient manner.

According to a preferred embodiment of the invention, the common mounting bushing has a second opening spaced radially from the first opening in the axial direction. The second opening is preferably designed in the same way as the first opening. More preferably, one or more of the further common mounting bushings have such a second opening. Preferably, the first mounting screw is designed such that it has a second outlet opening in the region of the second opening for releasing the coolant. An additional second opening allows for better distribution of the coolant on the stator back. This has the advantage that a particularly advantageous and efficient cooling of the stator lamination stack is provided in a simple and cost-effective manner.

Preferably, the first fastening screw projects from the stator lamination stack at a screw base and/or screw head area, with a third outlet opening for coolant discharge being formed at the screw base or screw head area. The third outlet opening is preferably designed as an outlet nozzle for spraying coolant onto a region of the stator winding, preferably a winding head. Preferably, a further first fastening screw, similarly configured, is arranged in the opposite direction on the stator lamination stack, so that the other winding head can also be cooled selectively. The two first fastening screws are preferably arranged above the stator longitudinal axis, preferably at the same level, to ensure uniform cooling of the winding heads. If the third outlet opening is located at the screw base, particularly at the end of the screw, the screw head area, particularly at the head end of the screw, preferably has an inlet opening for introducing coolant into the coolant line. If the third outlet opening is located in the screw head area, particularly at the head end of the screw, the screw foot area, especially at the end of the screw, preferably has an inlet opening for introducing the coolant into the coolant line. This has the advantage that a particularly effective and efficient cooling of the stator lamination stack is provided in a simple and cost-effective manner.

According to a second aspect of the invention, the problem is solved by an electric motor for powering a motor vehicle. The electric motor The machine has a rotor extending around a longitudinal axis. According to the invention, the electric machine has a stator according to the invention, wherein the rotor is arranged, preferably coaxially, on the stator. The rotor can also be referred to as a "rotor". The rotor can, for example, be rotatably mounted about the longitudinal axis of the rotor directly on the stator or on a machine housing of the electric machine via a bearing arrangement. The rotor preferably has a magnet arrangement, a rotor winding, a wire cage, or the like.

The electric machine according to the invention offers all the advantages already described for a rotor according to the first aspect of the invention. Accordingly, the electric machine according to the invention has the advantage over conventional electric machines that a particularly advantageous and efficient cooling of the stator lamination stack can be achieved using simple means and in a cost-effective manner. The coolant flowing through the coolant line can also be directed to the back of the stator via the first opening, thus enabling targeted cooling of this area. Furthermore, by appropriately designing the stator lamination disks, the number of disk variants can be reduced to such an extent that only a single disk design is required to manufacture the stator lamination stack of the electric machine according to the invention. Moreover, the electric machine according to the invention has a compact design, reduced installation space requirements, and a lower overall weight than conventional electric machines.

According to a third aspect of the invention, the problem is solved by a motor vehicle. The motor vehicle has an electric drive system. According to the invention, the electric drive system for propelling the motor vehicle includes an electric machine according to the invention. To provide electrical energy for operating the electric machine, the electric drive system preferably includes a traction battery and/or a fuel cell.

The motor vehicle according to the invention offers all the advantages already described for a rotor according to the first aspect of the invention and for an electric machine according to the second aspect of the invention. Accordingly, the motor vehicle according to the invention has the advantage over conventional motor vehicles that a particularly advantageous and efficient cooling of the stator lamination stack can be achieved using simple means and in a cost-effective manner. The coolant flowing through the coolant line can also be directed to the back of the stator via the first opening, thus enabling targeted cooling of the stator back. Furthermore, by appropriately designing the stator lamination disks, the number of variants of the stator lamination disks can be reduced to such an extent that only a single stator lamination disk design is required to manufacture the stator lamination stack of the electric machine of the motor vehicle according to the invention. Moreover, the motor vehicle according to the invention has a compact design, reduced installation space requirements, and a lower overall weight than conventional motor vehicles.

• 1 in einer Schnittdarstellung eine erste Befestigungsschraube einer bevorzugten ersten Ausführungsform eines erfindungsgemäßen Stators,
• 2 in einer Schnittdarstellung eine erste Befestigungsschraube einer bevorzugten zweiten Ausführungsform eines erfindungsgemäßen Stators,
• 3 in einer Schnittdarstellung einen Ausschnitt eines Stators gemäß einer bevorzugten dritten Ausführungsform,
• 4 in einer Schnittdarstellung einen Ausschnitt eines Stators gemäß einer bevorzugten vierten Ausführungsform,
• 5 in einer Draufsicht eine erste Statorblechscheibe eines Statorblechpakets in einer ersten Ausrichtung,
• 6 in einer Draufsicht eine zweite Statorblechscheibe des Statorblechpakets in einer zweiten Ausrichtung,
• 7 in einer Draufsicht eine dritte Statorblechscheibe des Statorblechpakets in einer dritten Ausrichtung,
• 8 in einer Draufsicht eine alternative Ausführungsform einer zweiten Statorblechscheibe des Statorblechpakets in der ersten Ausrichtung, und
• 9 in einer Seitenansicht eine bevorzugte Ausführungsform eines erfindungsgemäßen Kraftfahrzeugs.

A stator, an electric machine, and a motor vehicle according to the invention are explained in more detail below with reference to the drawings. The drawings schematically show:

• 1 in a sectional view a first fastening screw of a preferred first embodiment of a stator according to the invention,
• 2 in a sectional view a first fastening screw of a preferred second embodiment of a stator according to the invention,
• 3 in a sectional view a section of a stator according to a preferred third embodiment,
• 4 in a sectional view a section of a stator according to a preferred fourth embodiment,
• 5 in a top view a first stator lamination disk of a stator lamination stack in a first orientation,
• 6 in a top view a second stator lamination disk of the stator lamination stack in a second orientation,
• 7 in a top view a third stator lamination disk of the stator lamination stack in a third orientation,
• 8 in a top view an alternative embodiment of a second stator lamination disk of the stator lamination stack in the first orientation, and
• 9 A preferred embodiment of a motor vehicle according to the invention is shown in a side view.

Elements with the same function and mode of operation are in the 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 until 9 each provided with the same reference numerals.

In 1 is a first fastening screw 12 of a preferred first embodiment of a stator 1 according to the invention (cf. 3 The fastening screw 12 is shown schematically in a sectional view. It has a central coolant line 13 for conveying coolant, which is open to the outside at a screw base end having an external thread 21, thus forming a coolant inlet for introducing the coolant. To discharge the coolant from the central coolant line 13, the fastening screw 12 has a first outlet opening 14 and a second outlet opening 22, which are spaced apart from each other and extend radially outwards from the coolant line 13 along the longitudinal axis of the screw. The first outlet opening 14 is located between the external thread 21 and the second outlet opening 22. The first outlet opening 14 and the second outlet opening 22 are designed as bores with a round cross-section. According to the invention, further outlet openings can also be provided. Furthermore, the outlet openings, for example the first outlet opening 14 and/or the second outlet opening 22, may have a different design, such as a through hole through the entire fastening screw 12, a slot or the like.

The 2 shows a first fastening screw 12 of a preferred second embodiment of a stator 1 according to the invention (cf. 3 ) schematically in a sectional view. The fastening screw 12 made of 2 differs from the fastening screw 12 made of 1 insofar as the first outlet opening 14 is now arranged approximately centrally on the fastening screw 12 and no second outlet opening 22 is present. Furthermore, a third outlet opening 18, designed as an outlet nozzle 23, is arranged at a screw head end of the fastening screw 12 that is opposite the external thread 21. The outlet nozzle 23 is preferably designed as a separate component and, more preferably, rotatably relative to the coolant line 13, so that the third outlet opening 18 is aligned with the stator longitudinal axis 4 (see Figure 1). 9 ) is adjustable.

In 3 A section of a stator 1 according to a preferred third embodiment is shown schematically in a sectional view. 4 Figure 1 schematically shows a section of a stator 1 according to a preferred fourth embodiment in a sectional view. The stator 1 has a stator lamination stack 5 which is arranged around a longitudinal stator axis 4 (see Figure 1). 9 ) extends around. The stator lamination stack 5 consists of a plurality of stator lamination disks 6, which are coaxially and purposefully aligned and stacked together. The stator lamination disks 6 have several first stator lamination disks 6a, several third stator lamination disks 6c, and several second stator lamination disks 6b arranged between the first stator lamination disks 6a and the third stator lamination disks 6c. Furthermore, stator slots 7 are formed in the stator lamination stack 5, in which a stator winding 8 is arranged.

The stator laminations 6 each have a screw area 9 extending in the radial direction R with a central through-hole 10, which together form a common mounting through-hole 11. Due to a rotation of the second stator laminations 6b by 120° about the stator longitudinal axis 4, the screw areas 9 of the second stator laminations 6b are not visible in this view. Moreover, the rotation of the second stator laminations 6b by 120° creates a first opening 15 between the screw areas 9 of the first stator laminations 6a and the screw areas 9 of the third stator laminations 6c.

In the common mounting sleeve 11, a first mounting screw 12 is arranged such that the first outlet opening 14 is located within the first opening 15. Thus, coolant can be introduced from the mounting screw 12 into the first opening 15 via the first outlet opening 14 and thereby applied to the stator back of the stator 1. Furthermore, the arrangement of the stator lamination disks 6 forms a second opening 17 in the common mounting sleeve 11, in which a second outlet opening 22 of the mounting screw 12 is located. The second opening 17 is spaced axially A apart from the first opening 15. Thus, coolant can be introduced from the mounting screw 12 into the second opening 17 via the second outlet opening 22 and thereby also applied to the stator back of the stator 1. This provides improved cooling of the stator 1.

The fastening screw 12 and the coolant line 13 share a common central axis 16. The axial distance L of the central axis 16 from the stator longitudinal axis 4 (see...) 9 ) is larger than an outer radius O of the stator lamination stack 5. Thus, the influence of the fastening screw 12 on the magnetic flux of the stator 1 is reduced.

The in 4 The illustrated mounting screw 12 also has a third outlet opening 18 designed as an outlet nozzle 23. Coolant can be applied from the mounting screw 12 to a winding head of the stator winding 8 via the third outlet opening 18. This provides further improved cooling of the stator 1.

In 5 A first stator lamination disk 6a of a stator lamination stack 5 is schematically depicted in a top view in a first orientation. 6 schematically shows a second stator lamination disk 6b of the stator lamination stack 5 in a second orientation in a top view. 7 Figure 1 schematically shows a third stator lamination disk 6c of the stator lamination stack 5 in a third orientation in a top view. The stator slots 7 are not shown. The stator lamination disks 6 each have two screw areas 9, each with a central through-hole 10. In this view, the second orientation corresponds to a rotation about the stator longitudinal axis 4 counterclockwise from the first orientation by 120°. The third orientation in this view corresponds to a rotation about the stator longitudinal axis 4 counterclockwise from the second orientation by 120°. Thus, in the stator lamination stack 5, some screw areas 9 are aligned with each other, while between some screw end areas 9, a first opening 15 or a second opening 17 is formed.

In 8 An alternative embodiment of a second stator lamination disk 6b of the stator lamination stack 5 in the first orientation is schematically shown in a top view. The screw areas 9 each have an opening 24 through which the first opening 15 of the stator lamination stack 5 is formed.

The 9 Figure 1 schematically shows a preferred embodiment of a motor vehicle 3 according to the invention in a side view. The motor vehicle 3 has an electric drive system 20 with an electric machine 2 according to the invention and a traction battery 25. The electric machine 2 has a stator 1 according to the invention with a stator longitudinal axis 4, which surrounds a coaxially arranged rotor 19 of the electric machine 2.

Reference symbol list

1

stator

2

electric machine

3

motor vehicle

4

Stator longitudinal axis

5

Stator lamination package

6

Stator lamination disk

6a

first stator lamination

6b

second stator lamination

6c

third stator lamination

7

Stator slot

8

Stator winding

9

Screw area

10

implementation

11

Mounting feedthrough

12

fastening screw

13

Coolant line

14

first outlet opening

15

first opening

16

central axis

17

second opening

18

third outlet opening

19

rotor

20

electric drive system

21

external thread

22

second outlet opening

23

exhaust nozzle

24

breakthrough

25

Traction battery

A

axial direction

L

axle spacing

O

outer radius

R

radial direction

U

Circumferential direction

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• DE 10 2019 215 693 A1 [0003]
• JP 6 833 652 B2 [0004]
• JP 6 767 962 B2 [0004]

Claims (10)

Stator (1) for an electric machine (2) for driving a motor vehicle (3), comprising a stator lamination stack (5) extending along a stator longitudinal axis (4) and consisting of several coaxially arranged stator lamination disks (6, 6a, 6b, 6c) with several stator slots (7) formed in the stator lamination stack (5) and a stator winding (8) arranged in the stator slots (7), wherein several screw areas (9) with a central through-hole (10) are arranged on the stator lamination disks (6, 6a, 6b, 6c) distributed in the circumferential direction (U) such that the central through-holes (10) form a common mounting through-hole (11) for passing a mounting screw (12), and wherein a first mounting screw (12) is arranged in a mounting through-hole (11) which has a coolant line (13) for conveying coolant, wherein the coolant line (13) is located in a central screw area of the first mounting screw (12) has a first outlet opening (14) for venting the coolant, wherein a second stator ... Stator (1) after Claim 1 , characterized in that the screw areas (9) formed in the stator lamination disks (6, 6a, 6b, 6c) are designed as screw eyes which extend outwards in a radial direction (R). Stator (1) after Claim 1 or 2 , characterized in that an axial distance (L) of a central axis (16) of the central passage (10) to the stator longitudinal axis (4) corresponds to or is greater than an outer radius (O) of the stator lamination disk (6, 6a, 6b, 6c) formed outside the screw areas (9). Stator (1) according to one of the preceding claims, characterized in that the first outlet opening (14) is arranged in the area of the first opening (15). Stator (1) according to one of the preceding claims, characterized in that the stator lamination disks (6, 6a, 6b, 6c) each have two screw areas (9), wherein the screw areas (9) have a distance of 120° in the circumferential direction (U), wherein the second stator lamination disk (6b) is oriented rotated by 120° to the first stator lamination disk (6a). Stator (1) according to one of the preceding claims, characterized in that the stator lamination disks (6, 6a, 6b, 6c) are arranged such that several common fastening passages (11) with each of them having a first opening (15) are formed in the circumferential direction (U). Stator (1) according to one of the preceding claims, characterized in that the common fastening passage (11) has a second opening (17) spaced axially (A) from the first opening (15) in the radial direction (R). Stator (1) according to one of the preceding claims, characterized in that the first fastening screw (12) protrudes from the stator lamination stack (5) at a screw base area and/or at a screw head area, wherein a third outlet opening (18) for releasing the coolant is formed at the screw base area or at the screw head area. Electric machine (2) for driving a motor vehicle (3), comprising a rotor (19) extending about a rotor longitudinal axis, characterized in that the rotor (19) is arranged on a stator (1) according to one of the preceding claims. motor vehicle (3), comprising an electric drive system (20), characterized in that the electric drive system (20) for driving the motor vehicle (3) includes an electric machine (2) according to Claim 9 exhibits.