Stator arrangement for an electric machine with simplified assembly of the stator laminated core in the stator housing

Abstract

The invention specifies a stator arrangement (14a, 14g) for an electric machine (1, 1a, 1e), which comprises a stator housing (8a, 8g) and a stator (10a, 10g) arranged in the stator housing (8a, 8g). The stator (10a, 10g) has a stator laminated core (11a, 11e) having a plurality of stator laminations (12) stacked axially one on the other and that is fitted into the stator housing (8a, 8g). Specifically, the stator laminated core (11a, 11e) is fitted into the stator housing (8a, 8g) only at a first clearance fit (15a) in the region of a first end face (B1) of the stator laminated core (11a, 11e) and at a second clearance fit (15b) in the region of a second end face (B2) of the stator laminated core (11a, 11e) and is released in between said clearance fits. The first clearance fit (15a) lies radially further to the outside than the second clearance fit (15b) in relation to a stator axis (A) of the stator (10a, 10g). The invention also relates to an electric machine (1, 1a, 1e) having a stator arrangement (14a, 14g) of the above-mentioned type, to a vehicle (21) having an electric machine (1, 1a, 1e) of this type, and to a method for producing a stator arrangement (14a, 14g) of this type.

Description

[0001] Stator arrangement for an electrical machine with simplified assembly of the

[0002] Stator lamination package in the stator housing

[0003] TECHNICAL FIELD

[0004] The invention relates to a stator assembly for an electrical machine, comprising a stator housing and a stator arranged in the stator housing, which stator has a stator core with a plurality of axially stacked stator cores, wherein the stator core is fitted into the stator housing. Furthermore, the invention relates to an electrical machine having a stator assembly of the above-mentioned type and to a vehicle having such an electrical machine. Finally, the invention also relates to a method for producing a stator assembly of the above-mentioned type.

[0005] STATE OF THE ART

[0006] A stator assembly, an electric machine, a vehicle, and a manufacturing method of the aforementioned type are generally known from the prior art. The stator laminations are stacked to form a stator lamination stack, and then the stator lamination stack, or the finished stator, is fitted into the stator housing.

[0007] The relatively tight fit between the stator laminated core and the stator housing is problematic because when the stator laminated core or stator is inserted or pushed into the stator housing, metal chips can be inadvertently pulled out, particularly from an inner contour of the stator housing, and can enter the interior of the electrical machine unnoticed, where they can later cause damage to the electrical machine during operation and even trigger the failure of the electrical machine. This phenomenon occurs in particular, but not only, when the stator laminated core or stator is tilted, i.e. when the stator laminated core or stator is not guided precisely in the axial direction when inserted into the stator housing. With very tight fits between the stator laminated core and the stator housing, chip formation often cannot be prevented even with precise axial guidance of the stator laminated core or stator.

[0008] To prevent chip formation, the stator housing can be expanded by heating before the stator core is inserted into the stator housing (thermal joining process). The fit between the two components is then achieved by constricting the stator housing through cooling. However, this process is time-consuming and costly. Furthermore, the process is not suitable for complex stator housings that contain not only the electric motor but also the gearbox and inverter due to the risk of distortion.

[0009] DISCLOSURE OF THE INVENTION

[0010] An object of the invention is therefore to provide an improved stator assembly, an improved electric machine, an improved vehicle, and an improved manufacturing method for a stator assembly of an electric machine. In particular, chip formation during insertion or insertion of the stator core or stator into the stator housing, and thus damage to the electric machine or failure of the electric machine, are to be prevented without heating the stator housing prior to inserting the stator core.

[0011] The object of the invention is achieved with a stator arrangement of the type mentioned at the outset, in which the stator laminated core is fitted into the stator housing only at a first fit in the region of a first end face of the stator laminated core and at a second fit in the region of a second end face of the stator laminated core and is free in between and the first fit is located radially further outward with respect to a stator axis of the stator than the second fit.

[0012] Furthermore, the object of the invention is achieved by an electric machine with a stator arrangement of the above-mentioned type. In particular, the stator core can have a plurality of stator windings arranged therein. The electric machine can, in particular, comprise a rotor arranged in the stator and mounted in the housing for rotation about a rotor axis, with rotor windings or rotor magnets.

[0013] Furthermore, the object of the invention is achieved by a vehicle which has an electric machine of the above-mentioned type which is intended to drive the vehicle.

[0014] In addition, the object of the invention is achieved by a method for producing a stator arrangement for an electrical machine, which comprises the following steps:

[0015] Providing a stator housing and a stator which has a stator lamination stack with a plurality of axially stacked stator laminations,

[0016] Inserting the stator laminated core into the stator housing, wherein the stator laminated core is fitted into the stator housing only at a first fit in the region of a first end face of the stator laminated core and at a second fit in the region of a second end face of the stator laminated core and is released therebetween, and the first fit is located radially further outward with respect to a stator axis of the stator than the second fit.

[0017] The proposed measures prevent or at least reduce chip formation when inserting or pushing the stator core or stator into the stator housing. This also prevents the risk of damage to the electrical machine or the risk of failure of the electrical machine. This is achieved, on the one hand, by means of different sized snug fits and, on the other hand, by the clearance between the snug fits. This virtually eliminates contact between the stator core and the stator housing outside of the snug fits. Chip formation, if it occurs at all, is thus reduced to a minimum.

[0018] In summary, a bolted or clamped stator can be provided that is radially supported only on both axial sides. Furthermore, heating of the stator housing can be eliminated or reduced to a minimum. Another advantage is that the space created between the stator housing and the stator core can be used as a cooling channel.

[0019] In this context, the term "in the area of ​​the end face" refers in particular to an area that extends axially from the end face toward the center of the stator core and has an axial length of a maximum of 25% of the total length of the stator core. Specifically, the said area can directly border the end face. However, the area can also be slightly spaced from the end face and have a length of less than 25% of the total length of the stator core.

[0020] Further advantageous embodiments and developments of the invention emerge from the subclaims and from the description in conjunction with the figures.

[0021] It is advantageous if the stator laminations are fitted directly into the stator housing, for example, by making direct radial contact with the stator housing, and have a larger radial extension in the area of ​​the first end face than in the area of ​​the second end face of the stator lamination stack. This allows the stator lamination stack to be inserted into the stator housing without any additional components, keeping the parts list for the electrical machine assembly short.

[0022] It is also advantageous if the stator laminations all have the same radial extent, the stator lamination stack has a spacer ring in the region of the first end face, into which the stator laminations are fitted and which is fitted into the stator housing, and the stator laminations in the region of the second end face are fitted directly into the stator housing.

[0023] In this way, identical or similar stator laminations can be used to construct the stator lamination stack, which allows it to be manufactured particularly efficiently.

[0024] It is also advantageous if the spacer ring has a stop against which a front or outermost stator lamination rests in the area of ​​the first front side of the stator lamination stack, and if the spacer ring is screwed axially to the stator housing. This allows the spacer ring to be easily positioned axially on the stator lamination stack.

[0025] It is also advantageous if the stator housing has a stop against which the second end face of the stator core rests. This allows the stator core to be easily positioned axially in the stator housing.

[0026] In another design variant, the stator lamination stack can be bolted to the stator housing in the axial direction. This allows the stator lamination stack to be connected to the stator housing using readily available means. In yet another design variant, the stator lamination stack can be bolted to the spacer ring in the axial direction. This also allows the stator lamination stack to be connected to the spacer ring using readily available means.

[0027] Furthermore, it can be provided that the first fitting seat and / or second fitting seat is circularly cylindrical in shape or has a shape deviating from a circular cylinder.

[0028] Circular-cylindrical snug fits are particularly easy to manufacture. If the snug fits are circular-cylindrical, the stator core has a larger diameter near the first end face than near the second end face. If the first snug fit and / or second snug fit have a shape other than a circular cylinder, they also serve as a torque support between the stator and the stator housing.

[0029] In addition, it can be provided that the fit between the stator laminated core and the stator housing at the first fit and / or the second fit is designed as a clearance fit, transition fit or press fit. When clearance fits are used, the risk of chip formation is reduced to a minimum, whereas a press fit enables good centering and fixing of the stator laminated core in the stator housing. The use of a transition fit offers a good compromise between a clearance fit and a press fit. It is also conceivable to use different fits for the two fits. For example, the fit at the first fit can be designed as a press fit and the fit at the second fit as a clearance fit, or vice versa. This also offers a good compromise between avoiding chip formation and good centering and fixing of the stator laminated core in the stator housing.

[0030] It is also advantageous if the stator housing has a cooling channel for a cooling medium. This allows the stator to be cooled effectively. Liquids, such as water- or oil-based ones, are particularly suitable as cooling media, but the use of gaseous cooling media is also conceivable.

[0031] In a particularly advantageous embodiment, the cooling channel is defined by the stator housing and the stator laminations. If the spacer ring is present, the cooling channel is also defined by the spacer ring. This allows for particularly effective cooling of the stator.

[0032] In a further advantageous embodiment, cooling channel sections can branch off axially from the cooling channel, opening into the interior of the electric machine to cool components located there, for example, the winding ends of a stator winding. For this purpose, the axial boundaries of the cooling channel can be provided with openings through which cooling medium can flow from the cooling channel into the cooling channel sections. The coolant emerging from the cooling channel sections can, for example, be directed as a coolant jet onto a winding end of a stator winding or rotor winding.

[0033] It is also advantageous if the first and / or second fit are designed to be liquid-tight. This eliminates the need for additional sealing of the cooling channel.

[0034] It is also particularly advantageous if the spacer ring has a molded-on bearing plate with a bearing seat for a rotor shaft of the electric machine or for a bearing on the rotor shaft. In this way, the spacer ring fulfills a dual function.

[0035] It is also particularly advantageous if the stator laminations are fitted directly into the stator housing and have a greater radial expansion in the area of ​​the first end face than in the area of ​​the second end face, with a reduction in the radial expansion in the area of ​​the second end face and / or in the area of ​​the clearance being achieved by material removal. This allows identical or similar stator laminations to be used to construct the stator lamination stack, since their radial expansion is adjusted in a subsequent manufacturing step. In particular, the material removal can be achieved by machining the stator lamination stack.

[0036] SHORT DESCRIPTION OF THE CHARACTERS

[0037] Embodiments of the invention are illustrated by way of example in the accompanying schematic figures. They show:

[0038] Fig. 1 shows a first example of an electrical machine, schematically shown in half section;

[0039] Fig. 2 shows another exemplary electrical machine with an axial stop for the stator laminated core;

[0040] Fig. 3 shows another exemplary electrical machine with a spacer ring;

[0041] Fig. 4 shows an exemplary electrical machine, wherein the spacer ring has a

[0042] has a stop for the stator laminated core.

[0043] Fig. 5 shows an exemplary electrical machine in which the spacer ring has a molded-on bearing plate;

[0044] Fig. 6 is an exploded view of a stator arrangement in which the fitting seats have a contour deviating from the circular shape;

[0045] Fig. 7 shows the fully assembled stator arrangement from Fig. 6 in an oblique view;

[0046] Fig. 8 shows an alternative design of a stator arrangement in which the fitting seats have a contour deviating from the circular shape, and Fig. 9 shows an exemplary vehicle with an electric machine of the proposed type.

[0047] DETAILED DESCRIPTION OF THE INVENTION

[0048] By way of introduction, it should be noted that identical parts in the different embodiments are provided with the same reference symbols or component designations, possibly with different indices. The disclosure of a component contained in the description can be applied analogously to another component with the same reference symbol or component designation. Furthermore, the positional information chosen in the description, such as "top," "bottom," "rear," "front," "side," and so on, refers to the directly described and illustrated figure and, in the event of a change in position, is to be applied analogously to the new position.

[0049] Fig. 1 shows a half-section through a schematically illustrated electrical machine 1a. The electrical machine 1a comprises a rotor shaft 2 and a rotor laminated core 3 mounted thereon with a plurality of rotor laminates (not shown in detail) as part of a rotor 4, wherein the rotor shaft 2 is rotatably mounted about a rotor axis or stator axis A with the aid of (rolling) bearings 5a, 5b. Specifically, the first bearing 5a is located in a first front bearing plate 6a and the second bearing 5b in a second, rear bearing plate 7a. Furthermore, the electrical machine 1a comprises a stator housing 8a, which connects the front bearing plate 6a and the rear bearing plate 7a and together with these forms the machine housing 9a of the electrical machine 1a.

[0050] A stator 10a, or its stator lamination stack 11a, is fitted into the stator housing 8a. The stator lamination stack 11a has a plurality of axially stacked stator laminations 12 and can also accommodate optional stator windings 13. The stator housing 8a and the stator 10a, or the stator lamination stack 11a, form the stator assembly 14a or are at least part of it.

[0051] The stator core 11a is fitted into the stator housing 8a..8g only at a first snug fit 15a in the region of a first end face B1 of the stator core 11a and at a second snug fit 15b in the region of a second end face B2 of the stator core 11a, and is exposed therebetween. The first snug fit 15a is located radially further outward relative to a stator axis A of the stator 10a than the second snug fit 15b.

[0052] In the example shown in Fig. 1, the stator laminations 12 are fitted directly into the stator housing 8a and have a greater radial extension in the area of ​​the first end face B1 than in the area of ​​the second end face B2. As a result, the stator lamination stack 10a in this example is fitted into the stator housing 8a without any additional components, allowing the parts list for the construction of the electric machine 1a to be kept short.

[0053] In the example shown in Fig. 1, the stator housing 8a has an optional cooling channel 16 for a (liquid or gaseous) cooling medium. This allows the electric machine 1a to be integrated into a cooling circuit and the stator 10a to be effectively cooled. Specifically, in the given example, the cooling channel 16 is formed between the stator housing 8a and the stator laminations 12 of the stator lamination stack 11a, with the cooling channel 16 directly adjacent to the stator laminations 12. This results in a particularly strong cooling effect. In this context, it is also advantageous if the first fit 15a and / or second fit 15b is designed to be liquid-tight. In this way, further sealing of the cooling channel 16 can be dispensed with.

[0054] In general, a fit between the stator laminated core 11a and the stator housing 8a at the first fit 15a and / or the second fit 15b can be designed as a clearance fit, a transition fit, or a press fit. When using a clearance fit, the risk of chip formation is reduced to a minimum, whereas a press fit enables good centering and fixing of the stator laminated core 11a in the stator housing 8a. The use of a transition fit offers a good compromise between a clearance fit and a press fit. It is also conceivable to use different fits for the two fit seats 15a, 15b. For example, the fit at the first fit seat 15a can be designed as a press fit and the fit at the second fit seat 15b as a clearance fit, or vice versa. This also offers a good compromise between avoiding chip formation and good centering and fixing of the stator laminated core 11a in the stator housing 8a.

[0055] Fig. 2 now shows an example of an electrical machine 1b that is very similar to the electrical machine 1a shown in Fig. 1. In contrast, the stator housing 8b has a stop 17 against which the second end face B2 of the stator laminated core 11b rests. This allows the stator laminated core 11b to be easily positioned axially in the stator housing 8b. Furthermore, the stator laminated core 11b is screwed axially to the stator housing 8b with a screw 18, thereby permanently securing it in the stator housing 8b.

[0056] Fig. 3 shows an example of an electrical machine 1c that is very similar to the electrical machine 1b shown in Fig. 2. In contrast, the stator lamination stack 11c of the electrical machine 1c has a spacer ring 19c in the region of the first end face B1, into which some of the stator laminations 12 are fitted. The spacer ring 19c is in turn fitted into the stator housing 8c. In the region of the second end face B2, however, the stator laminations 12 are fitted directly into the stator housing 8c. Advantageously, the stator laminations 12 in this example all have the same radial extent, which allows them to be manufactured efficiently.

[0057] The optional cooling channel 16 is in this example between the

[0058] Stator housing 8c, the spacer ring 19c and the stator laminations 12 of the stator lamination stack 11c, wherein the cooling channel 16 in turn directly adjoins the stator laminations 12 and accordingly enables particularly effective cooling of the stator 10c.

[0059] In general, it is conceivable that the cooling channel 16 is hydraulically connected to an axially extending axial channel that opens into the interior of the electrical machine 1a, 1c, or is hydraulically connected to an outlet opening pointing in the direction of the stator axis A, which opens into the interior of the electrical machine 1a, 1c. In this way, other parts of the electrical machine 1a..1c can also be cooled. For example, a coolant jet can be directed onto a winding head of the stator 10a..10c and / or rotor 4.

[0060] Fig. 4 shows an example of an electrical machine 1d that is very similar to the electrical machine 1c shown in Fig. 3. In contrast, the spacer ring 19d has a stop 20 against which an outermost stator lamination 12 rests in the region of the first end face B1 of the stator lamination stack 11d. This allows the spacer ring 19d to be easily positioned axially on the stator lamination stack 11d. To fix the spacer ring 19d on the stator lamination stack 11d, the spacer ring 19d is screwed to the stator housing 8d in the axial direction using the screw 18.

[0061] Fig. 5 shows yet another example of an electrical machine 1e, which is very similar to the electrical machine 1d shown in Fig. 4. In contrast, the spacer ring 19e has a molded-on bearing plate 6e with a bearing seat for the rotor shaft 2 and a bearing seat for the bearing 5a, respectively. In this way, the spacer ring 19e fulfills a dual function.

[0062] A method for producing a stator arrangement 14a..14e for an electrical machine 1a..1e can in particular comprise the following steps:

[0063] Providing a stator housing 8a..8e and a stator 10a..10e having a stator laminated core 11a..11e of the type mentioned above, and inserting the stator laminated core 11a..11e into the stator housing 8a..8e, wherein the stator laminated core 11a..11e is inserted into the stator housing 8a..8e with the second fit 15b first.

[0064] The proposed measures prevent or at least reduce chip formation when inserting or pushing the stator core 11a..11e or stator 10a..10e into the stator housing 8a..8e. This also prevents the risk of damage to the electrical machine 1a..1e or the risk of failure of the electrical machine 1a..1e.

[0065] Fit seats 15a, 15b and the clearance between the fit seats 15a, 15b prevents contact of the stator core 11a..11e with the

[0066] Stator housing 8a..8e outside the fitted seats 15a, 15b can be virtually eliminated. Chip formation, if it occurs at all, is thereby reduced to a minimum. To largely eliminate chip formation at the fitted seats 15a, 15b, it can also be provided that the stator housing 8a..8e is heated relative to the stator laminated core 11a..11e before the stator laminated core 11a..11e is inserted into the stator housing 8a..8e and / or the stator laminated core 11a..11e is cooled relative to the stator housing 8a..8e.

[0067] In particular, the stator laminations 12, as shown in Figs. 1 and 2, can be fitted directly into the stator housing 8a, 8b and have a greater radial extent in the region of the first end face B1 than in the region of the second end face B2. A reduction in the radial extent in the region of the second end face B2 and / or in the area of ​​the clearance can advantageously be achieved by material removal. As a result, identical or similar stator laminations 12 can be used to construct the stator lamination stack 11a, 11b, since an adjustment of the radial extent thereof takes place in a further manufacturing step. In particular, the material removal can be carried out by machining the stator lamination stack 11a, 11b. In the previous examples, the first fit 15a and the second

[0068] The fit seat 15b is preferably circular-cylindrical in shape. However, this is not the only conceivable possibility. It is also conceivable that the first fit seat 15a and / or the second fit seat 15b has a shape deviating from a circular cylinder, as is illustrated in Figs. 6 to 8. Specifically, Figs. 6 and 7 show a first example of such a stator arrangement 14f, which is shown in Fig. 6 in an exploded view and in Fig. 7 in a fully assembled oblique view. Fig. 8 shows an alternative design of a

[0069] Stator arrangement 14g, in which the fitting seats 15a, 15b have a slightly different contour, deviating from the circular shape.

[0070] Generally, circular-cylindrical snug fits are particularly easy to manufacture. In this case, the stator laminated core 11a..11e has a larger diameter in the area of ​​the first end face B1 than in the area of ​​the second end face B2. If the first snug fit 15a and / or second snug fit 15b have a shape other than a circular cylinder, they also serve as a torque support between the stator 10a..10g and the stator housing 8a..8g.

[0071] Finally, Fig. 9 shows the electric machine 1 installed in a vehicle 21. The vehicle 21 has two axles, one of which is driven. Specifically, the electric machine 1 is connected to the semi-axles 23 of the rear axle or front axle via an optional transmission 22. The driven wheels 24 are mounted on the semi-axles 23. The electric machine 1, the transmission 22 and the semi-axles 23 are part of the drive train of the vehicle 21. The vehicle 21 is driven at least partially or temporarily by the electric machine 1. This means that the electric machine 1 can serve to drive the vehicle 21 alone or, for example, can be provided in conjunction with an internal combustion engine (hybrid drive).

[0072] Finally, it is noted that the protection area is defined by the

[0073] The description and drawings are intended for the interpretation of the claims. However, the description and drawings are to be used for the interpretation of the claims. The features contained in the figures can be interchanged and combined with one another as desired. In particular, it is also noted that the devices depicted may in reality comprise more or fewer components than shown. In some cases, the depicted devices or their components may also be depicted not to scale and / or enlarged and / or reduced in size.

[0074] List of reference symbols

[0075] 1 , 1 a..1e electrical machine

[0076] 2 rotor shaft

[0077] 3 rotor lamination pack

[0078] 4 Rotor

[0079] 5a, 5b (rolling) bearings

[0080] 6a..6e front bearing shield

[0081] 7a..7e rear bearing shield

[0082] 8a. ,8g Stator housing

[0083] 9a..9e machine housing

[0084] 10a..10g stator

[0085] 11 a..11 e Stator laminated core

[0086] 12 Stator sheet

[0087] 13 Stator winding

[0088] 14a..14g Stator arrangement

[0089] 15a, 15b Passsitz

[0090] 16 cooling channel

[0091] 17 stop

[0092] 18 Screw

[0093] 19c..19g spacer ring

[0094] 20 stops

[0095] 21 vehicles

[0096] 22 gearboxes

[0097] 23 semi-axis

[0098] 24 wheel

[0099] A Stator axis

[0100] B1, B2 front side

Claims

Patent claims 1. Stator arrangement (14a..14g) for an electrical machine (1 , 1 a..1 e), comprising a stator housing (8a..8g), a stator (10a..10g) arranged in the stator housing (8a..8g), which stator has a stator core (11 a..11 e) with a plurality of axially stacked stator laminations (12), wherein the stator core (11 a..11 e) is fitted into the stator housing (8a..8g), characterized in that the stator core (11 a..11 e) is fitted into the stator housing only at a first fit (15a) in the region of a first end face (B1) of the stator core (11a..11 e) and at a second fit (15b) in the region of a second end face (B2) of the stator core (11 a..11 e) in the stator housing (8a..8g) is fitted and is free in between and the first fit (15a) is located radially further outwards with respect to a stator axis (A) of the stator (10a..10g) than the second fit (15b).

2. Stator arrangement (14a..14g) according to claim 1, characterized in that the stator laminations (12) are fitted directly into the stator housing (8a..8g) and have a greater radial extent in the region of the first end face (B1) than in the region of the second end face (B2).

3. Stator arrangement (14a..14g) according to claim 1, characterized in that the stator laminations (12) all have the same radial extent, the stator lamination stack (11a..11e) has a spacer ring (19c..19g) in the region of the first end face (B1), into which the stator laminations (12) are fitted and which is fitted into the stator housing (8a..8g), and the stator laminations (12) in the region of the second end face (B2) are fitted directly into the stator housing (8a..8g).

4. Stator arrangement (14a..14g) according to claim 3, characterized in that the spacer ring (19c..19g) has a stop (20) against which a front-side stator sheet (12) rests, and the spacer ring (19c..19g) is screwed in the axial direction to the stator housing (8a..8g).

5. Stator arrangement (14a..14g) according to one of the preceding claims, characterized in that the stator housing (8a., 8g) has a stop (17) against which the second end face (B2) of the stator laminated core (11a..11e) rests.

6. Stator arrangement (14a..14g) according to one of the preceding claims, characterized in that the first fit (15a) and / or second fit (15b) are circular-cylindrical in shape or have a shape deviating from a circular cylinder.

7. Stator arrangement (14a..14g) according to one of the preceding claims, characterized in that a fit between the Stator laminated core (11a..11e) and the stator housing (8a. ,8g) at the first fit (15a) and / or at the second fit (15b) is designed as a clearance fit, transition fit or press fit.

8. Stator arrangement (14a..14g) according to one of the preceding claims, characterized in that the stator housing (8a. , 8g) has a cooling channel (16) for a cooling medium.

9. Stator arrangement (14a..14g) according to claim 8, characterized in that the cooling channel (16) is delimited by the stator housing (8a..8g) and the stator laminations (12) of the stator lamination stack (11a..11e), wherein the Cooling channel (16) is additionally delimited by the spacer ring (19c..19g) in the presence of the spacer ring (19c..19g) from claim 3.

10. Stator arrangement (14a..14g) according to claim 8 or 9, characterized in that the first fit (15a) and / or second fit (15b) are designed to be liquid-tight.

11. Stator arrangement (14a..14g) according to one of the preceding claims, characterized in that the spacer ring (19c..19g) has a molded-on bearing plate (6e) with a bearing seat for a rotor shaft (2) of the electrical machine (1, 1a..1e) or for a bearing (5a) of the rotor shaft (2).

12. Electrical machine (1, 1a..1e) with a stator arrangement (14a. ,14g) according to one of the preceding claims.

13. Vehicle (21) with an electric machine (1, 1a..1e) according to claim 12, which is provided for driving the vehicle (21).

14. Method for producing a stator arrangement (14a..14g) for an electrical machine (1, 1a..1e), comprising the steps Providing a stator housing (8a..8g) and a stator (10a..10g) which has a stator laminated core (11a..11e) with a plurality of axially stacked stator laminates (12), and Inserting the stator laminated core (11 a..11 e) into the stator housing (8a..8g), wherein the stator laminated core (11 a..11 e) is fitted into the stator housing (8a..8g) only at a first fit (15a) in the region of a first end face (B1) of the stator laminated core (11a..11 e) and at a second fit (15b) in the region of a second end face (B2) of the stator laminated core (11 a..11 e) and is released therebetween, and the first fit (15a) is located radially further outward with respect to a stator axis (A) of the stator (10a..10g) than the second fit (15b).

15. The method according to claim 14, characterized in that the stator laminations (12) are fitted directly into the stator housing (8a, 8b) and have a greater radial extent in the region of the first end face (B1) than in the region of the second end face (B2), wherein a reduction in the radial extent in the region of the second end face (B2) and / or in the region of the clearance is produced by material removal.

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