DE102021200277A1 - Process for manufacturing a cooled stator for an electric machine and electric machine with a cooling system - Google Patents

Abstract

A method for producing a stator (5) for an electrical machine (1, 1a, 1b) is specified, in which a laminated stator core (11a..11c) is provided which comprises peripheral tube slots (16) which have an undercut Have groove profile, which is open radially outwards. After inserting a cooling pipe (13) of a cooling system in the pipe groove (16), this is pressed with the stator core (11a..11c), the cooling pipe (13) being pressed transversely to the cooling pipe (13) by exerting pressure on it Longitudinal axis, which acts in the area of the opening of the groove profile, is plastically deformed. Furthermore, a stator (5) with tube slots (16) of the type mentioned and cooling tubes (13) pressed into them is specified. In addition, an electrical machine (1, 1a, 1b) with such a stator (5) is specified, as well as a vehicle (23) with such an electrical machine (1, 1a, 1b).

Description

TECHNICAL AREA

The invention relates to a method for producing a stator for an electrical machine and a stator for an electrical machine, which includes a laminated stator core and cooling tubes of a cooling system arranged therein. Furthermore, an electrical machine with such a stator and a vehicle with such an electrical machine are specified.

STATE OF THE ART

In electrical machines, it is known to cool the stator in order to dissipate waste heat from the stator that occurs during operation of the electrical machine. In some systems, cooling tubes are provided in the stator for this purpose, which are part of a cooling system and through which a heat transfer medium flows. The cooling system can also include a pump for circulating the heat carrier and a heat exchanger. A disadvantage of the known methods for producing a stator is that they are technically relatively complex and make the production of the electrical machine more expensive.

DISCLOSURE OF THE INVENTION

It is therefore an object of the invention to specify an improved method for producing a stator, an improved stator for an electrical machine, an improved electrical machine and an improved vehicle. In particular, it should be possible to manufacture the stator with less technical effort.

• - Bereitstellen eines Statorblechpakets des Stators, welches umfangsseitige Rohr-Nuten aufweist, welche ein hinterschnittenes Nutprofil aufweisen, das radial nach außen offen ist.
• - Einlegen eines Kühlrohrs eines Kühlsystems in die Rohr-Nut und
• - Verpressen des Kühlrohrs mit dem Statorblechpaket, wobei das Kühlrohr durch Ausüben eines Pressdrucks auf das Kühlrohr quer zu dessen Längsachse, welcher im Bereich der Öffnung des Nutprofils wirkt, plastisch verformt wird.

The object of the invention is achieved with a method for producing a stator for an electrical machine, comprising the steps

• - Providing a stator laminated core of the stator, which has circumferential tube slots which have an undercut slot profile which is open radially outwards.
• - Insertion of a cooling pipe of a cooling system in the pipe groove and
• - Pressing the cooling tube with the stator core, the cooling tube being plastically deformed by exerting a pressure on the cooling tube transversely to its longitudinal axis, which acts in the area of the opening of the slot profile.

• - die Kühlrohre in umfangsseitigen Rohr-Nuten des Statorblechpakets angeordnet sind, welche ein hinterschnittenes Nutprofil aufweisen, das radial nach au-ßen offen ist und
• - die Kühlrohre mit dem Statorblechpaket verpresst sind, wobei die Verpressung durch Ausüben eines Pressdrucks auf das Kühlrohr quer zu dessen Längsachse im Bereich der Öffnung des Nutprofils und plastische Verformung des Kühlrohrs hergestellt ist, und
• - dass der Stator insbesondere nach dem oben genannten Verfahren hergestellt ist.

Furthermore, the object of the invention is achieved with a stator for an electrical machine, which comprises a laminated stator core and cooling tubes of a cooling system arranged therein, wherein

• - The cooling tubes are arranged in peripheral tube slots of the stator lamination stack, which have an undercut slot profile which is open radially outwards and
• - The cooling tubes are pressed to the stator core, the pressing being produced by exerting a pressure on the cooling tube transversely to its longitudinal axis in the area of the opening of the groove profile and plastic deformation of the cooling tube, and
• - That the stator is made in particular according to the above method.

The object of the invention is also achieved with an electrical machine, which comprises a housing and a rotor arranged in the housing and rotatably mounted therein, as well as a stator of the above-mentioned type arranged in the housing.

Finally, the object is also achieved by a vehicle with at least two axles, at least one of which is driven, said drive taking place at least partially or at times by the electric machine mentioned above.

The disadvantages mentioned at the outset can be overcome with the aid of the proposed measures. In particular, the proposed method enables a stator to be manufactured with less technical effort. The tube grooves, which are open radially outwards, make it possible in particular to insert the cooling tubes radially from the outside into the tube groove. This is particularly quick and causes little or no problem in the manufacture of the stator. Even if this procedure is advantageous, in principle it is also possible to insert or push the cooling tubes into the tube groove in the axial direction. By pressing, a cooling tube can be quickly and permanently connected to the stator, especially in one step, since the cooling tube is pressed into the undercut area of the tube groove by the plastic deformation and can then no longer fall out, even if it loosens in an undesired manner would. The opening of the tube groove is therefore advantageously wider than the undeformed cooling tube and narrower than the deformed cooling tube after the pressing process. Another advantage of the method presented is that a press ram can be attached to the cooling tube over a relatively large area and only small local stress peaks occur. This is particularly advantageous when using thin-walled cooling tubes and/or when using cooling tubes made of soft materials.

The cooling tubes can generally consist of a metal, in particular steel, aluminum nium, copper or brass. The stator laminations of the stator core can be made of steel. It is particularly advantageous if the stator laminations are made of steel and the cooling tubes of the cooling system are made of aluminum, copper or brass. Due to the fact that the thermal expansion coefficient of aluminum, copper or brass is greater than that of steel, the cooling tubes are pressed even more strongly against the stator laminations when the electric machine heats up, which improves the thermal transfer resistance, but at least does not worsen it.

The tube slots can run in the axial direction or obliquely (that is, helically) and can be produced by punching or cutting appropriate cutouts in the individual stator laminations. If the stator laminations are stacked on top of each other, the tube slots are created as a result. If the stator laminations are not twisted when stacked, axially running tube slots are created. If the stator laminations are slightly twisted against each other when stacked, the tube slots will be inclined. Although the specified method for producing the tubular slots is advantageous, in principle they could also be produced differently, for example by milling the finished, stacked stator core.

The groove base of the groove profile can preferably be convexly curved outwards. In particular, its curvature can correspond to a radius centered on the axis of rotation of the rotor. As a result, the magnetic function of the laminated core of the stator is only slightly influenced by the tube slots.

The cooling tubes can be part of a cooling system of the electrical machine, which can also have a pump for a heat transfer medium and a heat exchanger. A water-glycol mixture circulating in the cooling system or oil, for example, can be used as the heat carrier. Advantageously, the housing does not need to have a cooling function, but rather it can be designed relatively freely.

In addition to their cooling function, the cooling tubes can advantageously also be used to align the stator laminations of the stator laminations and thus provide an additional benefit. In particular, no other measures then need to be taken to align the stator laminations.

Further advantageous refinements and developments of the invention result from the dependent claims and from the description in conjunction with the figures.

It is favorable if the laminated core of the stator is cooled to a temperature in the range from -20° to +10° before the cooling tube is pressed. This is particularly advantageous when the electrical machine is used at a low temperature, since a good thermal transition resistance between the cooling tubes and the stator laminations can also be ensured at the later operating temperature of the electrical machine.

It is favorable if the cooling system has a deflection for a cooling medium of the cooling system, which is produced by bending the cooling tube or by welding or soldering on a curved tube part. As a result, the individual cooling tubes can be connected to one another and effective cooling can be created for the stator. Basically, the cooling system can also be made of a single cooling tube with several bends. If several cooling tubes are connected by welding or soldering on an arcuate tube part, then the ends of the cooling tubes can be brought to a desired shape after pressing if they deform if they are deformed again. This can be done, for example, by forming using an inner mandrel and a corresponding outer counterpart. For example, a cylindrical tube end can be produced in this way. However, it would also be conceivable for the pipe end to be kept in shape during the pressing, for example with the help of an inner mandrel.

It is also favorable if tie rods are provided between the peripheral tube grooves for axially securing the laminated stator core. This prevents the stator laminations from moving apart undesirably.

It is also advantageous if the housing of the electrical machine includes a front end shield and a rear end shield, in which bearings for mounting the rotor are arranged, and which have connections for the cooling tubes of the cooling system and channels for connecting the cooling tubes. In particular, the cooling tubes are pressed into recesses in the end shield. But gluing is also possible, for example. The end shields thus become part of the cooling system. Bending of the cooling pipe or welding or soldering of an arcuate pipe part to a cooling pipe can then be omitted.

Finally, it is also advantageous if the cooling tubes protrude radially beyond the laminated stator core and a frictional connection is produced between the laminated stator core and the housing by additional plastic or elastic deformation of the cooling tubes. Therefore, there is no or only a rough processing of the inside of the housing is necessary. In principle, it would also be possible to manufacture the housing from plastic, in which case the material of the housing is injection-molded around the stator. It is also conceivable to design the plastic housing so flexibly that it nestles around the stator after it has been pressed in. In both cases, a form fit is created. Both housing variants can also be realized without protruding cooling pipes.

The above configurations and developments of the invention can be combined in any desired manner.

character list

• 1 eine schematisch im Halbschnitt dargestellte, beispielhafte elektrische Maschine;
• 2 das Statorblechpaket der elektrischen Maschine aus 1, bis auf ein Kühlrohr isoliert vom Rest derselben, in Schrägansicht;
• 3 das Statorblechpaket aus 2 ohne Kühlrohre in Vorderansicht;
• 4-9 einen beispielhaften Ablauf beim Verpressen eines Kühlrohrs mit dem Statorblechpaket;
• 10 ein Statorblechpaket mit Kühlrohren, die nach dem Verpressen eine im Wesentlichen kreiszylindrische Form beibehalten;
• 11 wie 10 nur mit Bohrungen für Zuganker;
• 12 einen Halbschnitt einer elektrischen Maschine mit Lagerschilden, die Kanäle eines Kühlsystems und Anschlüsse für Kühlrohre aufweisen;
• 13 einen beispielhaften Ablauf zur Formgebung der stirnseitigen Enden des Kühlrohrs;
• 14 ein Beispiel für radial über das Statorblechpaket hinausragende Kühlrohre, welche in Kontakt mit dem Gehäuse stehen und
• 15 eine elektrische Maschine mit einem Stator der vorgeschlagenen Art, welche in ein Fahrzeug eingebaut ist.

Exemplary embodiments of the invention are shown in the accompanying schematic figures. Show it:

• 1 an exemplary electrical machine shown schematically in half section;
• 2 the stator laminated core of the electrical machine 1 , isolated from the rest of the same except for a cooling tube, in oblique view;
• 3 the stator core 2 without cooling tubes in front view;
• 4-9 an exemplary process when pressing a cooling tube with the stator core;
• 10 a laminated stator core with cooling tubes which retain an essentially circular-cylindrical shape after pressing;
• 11 how 10 only with holes for tie rods;
• 12 a half section of an electrical machine with end shields that have channels of a cooling system and connections for cooling tubes;
• 13 an exemplary process for shaping the front ends of the cooling tube;
• 14 an example of cooling tubes that protrude radially beyond the laminated core of the stator and are in contact with the housing and
• 15 an electrical machine with a stator of the proposed type, which is installed in a vehicle.

DETAILED DESCRIPTION OF THE INVENTION

As an introduction, it is stated that the same parts in the different embodiments are provided with the same reference numbers or the same component designations, possibly with different indices. The disclosures of a component contained in the description can be transferred analogously to another component with the same reference number or the same component designation. The position information selected in the description, such as "top", "bottom", "back", "front", "side" and so on, refers to the figure directly described and shown and, in the event of a change of position, to the new one transfer location.

1 shows a half section through a schematically illustrated electrical machine 1a. The electrical machine 1a comprises a shaft 2 with a rotor 3 seated thereon, not shown in detail here, the shaft 2 being rotatably mounted about an axis of rotation A relative to a stator 5 with the aid of (roller) bearings 4a, 4b. Specifically, the first bearing 4a sits in a front bearing plate 6a and the second bearing 4b in a rear bearing plate 7a. Furthermore, the electrical machine 1a includes a (middle) housing part 8 which connects the front end shield 6a and the rear end shield 7a and accommodates the stator 5 . In this example, the front end shield 6a, the rear end shield 7a and the housing part 8 form the housing 9 of the electrical machine 1a.

In this example, the stator 5 has a plurality of stator laminations 10, which form a stator lamination stack 11a or a stator base body, as well as stator windings 12 arranged in the stator lamination stack 11a. 14b. The cooling tube 13 and the tube bends 14a, 14b are part of one in the 1 not shown in its entirety cooling system of the electric machine 1a. In particular, the cooling system can also have a pump for a heat carrier and a heat exchanger. A water-glycol mixture circulating in the cooling system or oil, for example, can be used as the heat carrier.

2 shows the laminated stator core 11a, isolated from the rest of the electrical machine 1a except for a cooling tube 13, in an oblique view. How from the 2 is clearly visible, the stator lamination packet 11a has a plurality of stator winding slots 15 which accommodate the stator windings 12 and a plurality of tube slots 16 which accommodate the cooling tubes 13. Both the stator winding slots 15 and the tube slots 16 run in the axial direction in the example shown. However, the stator winding slots 15 and/or the tube slots 16 could also run obliquely, that is to say helically. A cooling tube 13 is representatively pressed into one of the tube grooves 16 . Of course, several of the tube slots 16 or even all tube slots 16 are included in the finished electrical machine 1a Cooling tubes 13 occupied. How from the 2 can be seen, the pipe grooves 16 have an undercut groove profile.

The stator winding slots 15 and/or the tube slots 16 can be produced by punching or cutting corresponding cutouts in the individual stator laminations 10 . If the stator laminations 10 are stacked one on top of the other, the stator winding slots 15 and the tubular slots 16 are formed as a result. If the stator laminations 10 are not twisted during stacking, axially running stator winding slots 15 and tubular slots 16 are formed. If the stator laminations 10 slightly twisted relative to one another when stacked, the stator winding slots 15 and tube slots 16 are inclined be made, for example by milling and / or broaching the finished stacked stator core 11a.

3 shows the stator core 11a now in front view, and the 4 until 9 show the process when pressing a cooling tube 13 with the stator core 11a, wherein the 4 until 9 each show a section of the upper part of the stator core 11a.

4 shows the stator core 11a arranged on a base 17 with the still free tube slot 16. 5 shows a method step in which a cooling tube 13 is brought up to the tube groove 16 from above. in the in 6 illustrated method step, the cooling tube 13 is inserted into the tube groove 16. in the in 7 In the method step shown, a ram 18 is moved towards the cooling tube 13 . in the in 8th illustrated method step presses the ram 18 on the cooling tube 13 and deforms it. In detail, the cooling tube 13 is plastically deformed by exerting a pressure transversely to its longitudinal axis, which acts in the area of the opening of the tube groove 16 . in the in 9 In the method step shown, after the cooling tube 13 has been pressed with the stator lamination stack 11a, the press ram 18 is moved away from the cooling tube 13 again.

• - Bereitstellen eines Statorblechpakets 11a des Stators 5, welches umfangsseitige Rohr-Nuten 16 aufweist, welche ein hinterschnittenes Nutprofil aufweisen, das radial nach außen offen ist.
• - Einlegen eines Kühlrohrs 13 eines Kühlsystems in die Rohr-Nut 16 und
• - Verpressen des Kühlrohrs 13 mit dem Statorblechpaket 11a, wobei das Kühlrohr 13 durch Ausüben eines Pressdrucks auf das Kühlrohr 13 quer zu dessen Längsachse, welcher im Bereich der Öffnung des Nutprofils oder der Rohr-Nut 16 wirkt, plastisch verformt wird.

The method for producing a stator 5 for the electrical machine 1a therefore comprises the steps

• - Provision of a stator core 11a of the stator 5, which has circumferential tube grooves 16 which have an undercut groove profile which is open radially outwards.
• - Insertion of a cooling pipe 13 of a cooling system in the pipe groove 16 and
• - Pressing the cooling tube 13 with the stator core 11a, wherein the cooling tube 13 is plastically deformed by exerting a pressure on the cooling tube 13 transversely to its longitudinal axis, which acts in the area of the opening of the groove profile or the tube groove 16.

• - die Kühlrohre 13 in umfangsseitigen Rohr-Nuten 16 des Statorblechpakets 11a angeordnet sind, welche ein hinterschnittenes Nutprofil aufweisen, das radial nach außen offen ist und
• - die Kühlrohre 13 mit dem Statorblechpaket 11a verpresst sind, wobei die Verpressung durch Ausüben eines Pressdrucks auf das Kühlrohr 13 quer zu dessen Längsachse im Bereich der Öffnung des Nutprofils oder der Rohr-Nut 16 und plastische Verformung des Kühlrohrs 13 hergestellt ist.

The result is a stator 5 for an electrical machine 1a, comprising a laminated stator core 11a and cooling tubes 13 of a cooling system arranged therein, wherein

• - The cooling pipes 13 are arranged in peripheral pipe grooves 16 of the stator core 11a, which have an undercut groove profile which is open radially outwards and
• - the cooling tubes 13 are pressed with the stator core 11a, the pressing being produced by exerting a pressure on the cooling tube 13 transversely to its longitudinal axis in the area of the opening of the groove profile or the tube groove 16 and plastic deformation of the cooling tube 13.

The pressing is advantageously produced as shown in the figures, although another type of production would also be possible in principle.

10 now shows a stator core 11b, which is very similar to the stator core 11a. In contrast to this, however, the tube grooves 16 are shaped differently, so that the cooling tube 13 essentially retains its circular-cylindrical shape during compression. At this point, it should be noted that the cooling tube 13 is pushed axially into the tube slot 16 in this embodiment variant, whereas the cooling tube 13 in the case of the laminated core 11a of the stator can be inserted radially from the outside into the tube slot 16 (as is shown in Figs 4-9 is shown). Alternatively, the cooling tube 13 of the laminated core 11a of the stator can also be pushed axially into the tube slot 16 .

the 10 also shows a way in which the individual cooling tubes 13 can be connected. Specifically, this is done by pipe bends 14a, which are connected via connecting pipes 19. For example, the pipe bends 14a can be soldered or welded to the cooling pipes 13 and the connecting pipes 19. However, it is also conceivable that the cooling tube 13 itself is bent accordingly. The cooling system can therefore basically be produced from a single cooling tube 13, but it is also possible for a number of cooling tubes 13, each with one bend or a number of bends, to be soldered or welded to form a cooling system. The bends or arches generally form deflections for a cooling medium of the cooling system.

the 11 shows an embodiment variant of a stator lamination stack 11c, which corresponds to that in 10 illustrated stator core 11b is very similar. In this embodiment variant, however, 16 bores 20 for tie rods are provided between the peripheral tube grooves, which serve to axially secure the stator core 11c.

12 shows a half-section through a schematically illustrated electrical machine 1b, which corresponds to that in 1 illustrated electric machine 1a is very similar. In contrast to this, the front end shield 6b and the rear end shield 7b are shaped differently. Specifically, these include connections for the cooling tubes 13 of the cooling system, as well as channels 21a, 21b for connecting the cooling tubes 13. The cooling tubes 13 can be pressed in particular into recesses in the bearing plates 6b, 7b, but the cooling tubes 13 can also be glued into the bearing plates 6b, 7b is possible, for example.

So that the cooling tubes 13 retain a desired shape when pressed at the front ends, inner mandrels 22a, 22b can be pushed into the cooling tube 13, while a pressing pressure is exerted on the cooling tube 13 with the ram 18. The laminated core 11a of the stator rests on the base 17 . It would also be conceivable for the ends of the cooling tubes 13 to be shaped and brought into a desired shape after being pressed with the press ram 18 with the aid of an inner mandrel 22a, 22b and a corresponding outer counterpart. In both cases, a connection of the cooling tubes 13 to tube bends 14a, 14b or other cooling tubes 13, for example by welding or soldering, is facilitated. The same applies to the insertion or pressing into the connections in the end shields 6b, 7b, which is also facilitated or made possible in the first place by a defined shape of the ends of the cooling tubes 13.

It is advantageous if the cooling tubes 13 protrude radially beyond the stator core 11a and a frictional connection between the stator core 11a and the housing 9 (specifically with the housing part 8) is produced by an additional plastic or elastic deformation of the cooling tubes 13. Such an arrangement is in 14 shown as an example. As a result of the proposed measures, no or only rough machining of the inside diameter of the housing part 8 is necessary. In principle, it would also be possible to manufacture the housing part 8 from plastic, the stator 5 being overmoulded with the material of the housing part 8 . It is also conceivable to make the plastic housing so flexible that it (in the hardened state) nestles around the stator 5 after it has been pressed in. In both cases, a form fit is created. In principle, however, both housing variants can also be realized without projecting cooling pipes 13 .

In general, the cooling tubes 13 can consist of a metal, in particular steel, aluminum, copper or brass. The stator laminations 10 of the stator laminations 11a can be made of steel. It is particularly advantageous if the stator laminations 10 are made of steel and the cooling tubes 13 of the cooling system are made of aluminum, copper or brass. Because the thermal expansion coefficient of aluminum, copper or brass is greater than that of steel, the cooling tubes 13 are pressed even more strongly against the stator laminations 10 when the electrical machine 1a, 1b heats up, which improves the thermal contact resistance, but at least does not worsen it .

If the operating temperature of the electrical machine 1a, 1b is particularly low, it can therefore also be advantageous if the laminated stator core 11a is cooled to a temperature in the range of -20° to +10° before the cooling tube 13 is pressed. As a result, a good thermal transition resistance between the cooling tubes 13 and the stator laminations 10 can also be ensured at the subsequent operating temperature of the electrical machine 1a, 1b.

The groove base of the groove profile of the pipe grooves 16 can preferably be convexly curved outwards. In particular, its curvature can correspond to a radius centered on the axis of rotation A. As a result, the magnetic function of the laminated core 11a of the stator is less influenced by the tube slots 16 .

Advantageously, due to the proposed measures, the housing 9 does not need to have a cooling function, but can be designed freely.

In addition to their cooling function, the cooling tubes 13 can advantageously also serve to align the stator laminations 10 of the stator laminations 11a and thus fulfill an additional benefit. In particular, no other measures for aligning the stator laminations 10 then need to be taken.

the 15 finally shows the electric machine 1 installed in a vehicle 23. The vehicle 23 has at least two axles, at least one of which is driven. Specifically, the electric motor 1 is connected to an optional gear 24 and a differential gear 25 . The semi-axles 26 of the rear axle connect to the differential gear 25 . Finally, the driven wheels 27 are mounted on the semi-axles 26 . The vehicle 23 is driven at least partially or temporarily by the electric machine 1. The This means that the electric machine 1 can be used to drive the vehicle 23 alone or, for example, can be provided in combination with an internal combustion engine (hybrid drive).

Finally, it is stated that the scope of protection is determined by the patent claims. However, the description and drawings should be used to interpret the claims. The features contained in the figures can be arbitrarily exchanged and combined with one another. In particular, it is also stated that in reality the devices shown can also include more or fewer components than shown. In some cases, the devices shown or their components may also be shown not to scale and/or enlarged and/or reduced.

Claims (10)

Method for producing a stator (5) for an electrical machine (1, 1a, 1b), having the following method steps: - Providing a stator core (11a..11c) of the stator (5), which has peripheral tube slots (16) which have an undercut slot profile which is open radially outwards. - Insertion of a cooling tube (13) of a cooling system in the tube groove (16) and - Pressing the cooling tube (13) with the stator core (11a..11c), the cooling tube (13) being plastically deformed by exerting a pressure on the cooling tube (13) transversely to its longitudinal axis, which acts in the area of the opening of the slot profile . procedure after claim 1 , characterized in that the cooling tube (13) is pushed axially into the tube groove (16) or is inserted radially from the outside into the tube groove (16). procedure after claim 1 or 2 , characterized in that the stator laminated core (11a..11c) is cooled to a temperature in the range from -20° to +10° before the cooling tube (13) is pressed. Stator (5) for an electrical machine (1, 1a, 1b), comprising a stator core (11a..11c) and arranged therein cooling tubes (13) of a cooling system, characterized in that - the cooling tubes (13) in peripheral tube grooves (16) of the stator core (11a..11c) are arranged, which have an undercut groove profile which is open radially outwards and - the cooling tubes (13) are pressed with the stator core (11a..11c), the compression being exerted a pressing pressure on the cooling tube (13) transverse to its longitudinal axis in the area of the opening of the groove profile and plastic deformation of the cooling tube (13) is produced, and - that the stator (5) in particular according to one of Claims 1 until 3 is made. Stator (5) after claim 4 , characterized in that the cooling system has a deflection for a cooling medium of the cooling system, which is produced by bending the cooling pipe (13) or by welding or soldering on an arcuate pipe part (14a, 14b). Stator (5) after claim 4 , characterized in that between the peripheral tube grooves (16) tie rods for axially securing the stator core (11a..11c) are provided. Electrical machine (1, 1a, 1b), comprising - a housing (9) and - a rotor (3) arranged in the housing (9) and rotatably mounted therein, characterized by - a stator (5) arranged in the housing (9). one of the Claims 4 until 6 . Electrical machine (1, 1a, 1b), characterized in that the housing (9) comprises a front bearing plate (6b) and a rear bearing plate (7b), in which bearings (4a, 4b) for supporting the rotor (3) are arranged are, and which have connections for the cooling pipes (13) of the cooling system and channels (21a, 21b) for connecting the cooling pipes (13). Electrical machine (1, 1a, 1b), characterized in that the cooling tubes (13) project radially beyond the stator core (11a..11c) and a frictional connection between the stator core (11a..11c) and the housing (9). an additional plastic or elastic deformation of the cooling tubes (13) is produced. Vehicle (23) with at least two axles, at least one of which is driven, characterized in that said drive is at least partially or temporarily by the electric machine (1, 1a, 1b) according to one of Claims 7 until 9 he follows.

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