DE102023130904A1 - Rotor arrangement and electric machine - Google Patents

Abstract

The invention relates to a rotor arrangement (1), comprising a rotor body (2) which forms a plurality of slots (3) in the axial direction for receiving a winding (4), rotor poles (5) which are formed in the radial direction between two of the slots (3), windings (4) which run in the slots (3) and enclose the rotor poles (5), slot closure elements (6) which close the slots (3) in the radial direction, at least one separating body (7) which is arranged in one of the slots (3) in the circumferential direction between two of the windings (4), wherein the separating body (7) comprises at least one continuous cooling channel (8) extending in the axial direction, through which a cooling medium can flow, wherein a fluid inlet element (41) is coupled to a first axial end (40) of the cooling channel (8) and a fluid outlet element (43) is coupled to a second axial end (42) of the cooling channel (8), so that the cooling medium can be supplied via the Fluid inlet element (41) can flow into the cooling channel (8) and flow out of the cooling channel (8) via the fluid outlet element (43).

Description

The present invention relates to a rotor arrangement comprising a rotor body which forms a plurality of slots in the axial direction for receiving a winding, rotor poles which are formed in the radial direction between two of the slots, windings which run in the slots and enclose the rotor poles, slot closure elements which close the slots in the radial direction, and at least one separating body which is arranged in one of the slots in the circumferential direction between two of the windings, wherein the separating body comprises at least one continuous cooling channel extending in the axial direction through which a cooling medium can flow. The invention further relates to an electrical machine.

Electric motors are increasingly being used to power motor vehicles, creating alternatives to combustion engines that require fossil fuels. Considerable efforts have already been made to improve the everyday suitability of electric drives and also to provide users with the same level of driving comfort they are accustomed to.

In the development of electrical machines, particularly those intended for electric axles or hybrid modules, there is a continuing need to increase their power density and efficiency while simultaneously reducing manufacturing costs. In this context, it is also known to design electrical machines as separately excited synchronous machines (SMMs). A separately excited synchronous machine is a special type of synchronous machine in which the magnetic field in the rotor is generated not by permanent magnets, but by energizable coils. These coils are often also referred to as field or excitation coils. To energize the coils in the rotating rotor, the power must be supplied via suitable transformer devices.

Due to the manufacturing process, gaps can occur between any two excitation windings of a rotor. Support or separating elements are inserted into these gaps, filling the gap completely or largely. Particularly for high-speed applications, the separating elements secure the excitation coil windings in the centrifugal force field against unintentional movement. EP 1 494 335 B1 discloses corresponding separating bodies between adjacent excitation coils.

Particularly with regard to increased power density and efficiency, there is a need to cool the rotor during operation and dissipate thermal energy, especially in separately excited synchronous machines. Air-cooled rotors or fluid-cooled hollow shafts, for example, are known from the state of the art. DE102018220810A1 discloses a fluid-cooled rotor for an electrical machine and a separately excited synchronous machine with directly or near-loss cooled rotor winding. A fluid-cooled hollow shaft with a conical wall is disclosed in the EP3618241A1 revealed.

The object of the present invention is to provide a suitable device for dissipating thermal energy from a rotor for a separately excited synchronous machine, which has a compact design and a high level of operational reliability.

This object is achieved by a rotor arrangement comprising a rotor body which forms a plurality of slots in the axial direction for receiving a winding, rotor poles which are formed in the radial direction between two of the slots, windings which run in the slots and enclose the rotor poles, slot closure elements which close the slots in the radial direction, at least one separating body which is arranged in one of the slots in the circumferential direction between two of the windings, wherein the separating body comprises at least one continuous cooling channel which extends in the axial direction and through which a cooling medium can flow, wherein a fluid inlet element is coupled to a first axial end of the cooling channel and a fluid outlet element is coupled to a second axial end of the cooling channel, such that the cooling medium can flow into the cooling channel via the fluid inlet element and out of the cooling channel via the fluid outlet element.

This allows for a particularly favorable connection of the separating element to a cooling circuit. It may be preferred that the fluid inlet element and the fluid outlet element be designed essentially identically.

The separating body is formed in the region of at least one of its axial ends on its inner wall in such a way that a smooth inner contour is created over an axial length of preferably up to 15 mm. This region can also be reworked using machining processes. An inlet element or an outlet element for the cooling medium is then inserted into this region. The inlet element and/or the outlet element can be glued, welded, joined by means of a press fit and/or form-fitting to the separating body. In a preferred embodiment, the inlet element or the outlet element is connected to the separating body with a seal, for example an O-ring seal. sealed from the outside. This results in closed assemblies that are sealed against the cooling medium and are inserted between two rotor coils, but essentially do not protrude beyond the axial extent of the rotor coils, so that the axial length of the rotor is not significantly increased by these assemblies.

Preferably, the inlet element and/or the outlet element contain/contains in their interior openings and/or channels for guiding the cooling medium in the axial and/or radial direction, so that the shape of the opening in the interior of the separating body is converted to a shape that is suitable for guiding the cooling medium into adjacent components.

Advantageous embodiments of the invention

According to an advantageous embodiment of the invention, a filler made of a non-ferromagnetic material can be positioned in the cooling channel, and the filler has cooling fins projecting from its surface toward the inner wall of the separating body. The separating body and the filler with its cooling fins can thus provide a particularly large surface area in the cooling channel relative to the cooling medium in order to achieve good heat transfer into the cooling medium. Furthermore, the cooling medium is preferably guided close to the outer contour of the separating body, which can also contribute to improving heat transfer into the cooling medium.

According to an advantageous embodiment of the invention, the cooling fins can be formed integrally, preferably monolithically, with the filler body. The advantage of this embodiment is that it allows for particularly good heat transfer and a particularly favorable shape of the cooling fins from a manufacturing perspective.

The cooling fins can provide an increased surface area and, as a result, optimized heat transfer from the filler and separator to the cooling medium. The cooling fins can be incorporated into the filler, for example, by an extrusion or molding process.

The cooling fins preferably have a constant cross-section in the axial direction. Furthermore, the cooling fins preferably have a substantially constant radial distance from a rotational axis in the axial direction. The advantageous effect of this design lies in the fact that the design of the cooling fins prevents a speed- and direction-dependent pumping effect caused by the cooling fins projecting into the cooling channel. Furthermore, this design allows the filler to be manufactured using extrusion and/or injection molding processes.

It is further preferred that the cooling fins have a substantially identical geometry, which is particularly advantageous in terms of manufacturing technology and simplifies the modeling of the heat transfer.

In principle, it would be conceivable that the separating body also has cooling fins that extend out of the inner wall of the separating body in the direction of the filler body.

According to one embodiment, a cavity is formed in the slot, which is delimited by one of the windings and the separator, wherein the cavity comprises a potting material. The advantageous effect of this embodiment is that the potting material in the cavity improves the thermal connection between the windings and the separator. The cavity results from manufacturing-related component tolerances of the windings and the separator.

According to one embodiment, the cooling medium is a cooling liquid. The advantageous effect of this embodiment is that cooling liquids have a higher heat capacity and higher thermal conductivity than gases, thus enabling better heat dissipation and dissipation of power losses. In particular, the cooling liquid contains oil and/or water.

According to one embodiment, the rotor body is designed as a laminated core. The advantageous effect of this design is that eddy current losses in the rotor body are minimized.

The separator is preferably made of a non-ferromagnetic material to avoid disrupting the electromagnetic function of the rotor or the electrical machine. The separator is preferably made at least partially of a material with good thermal conductivity to ensure a good thermal connection between the rotor windings and the cooling medium. The separator can be manufactured, for example, using an aluminum extrusion process, plastic extrusion, or a plastic injection molding process. This allows for the creation of shapes that are hollow on the inside but closed on the outside, capable of conveying a cooling medium and that are leak-proof even under high pressure.

The separator thus essentially serves two functions. Firstly, the separator can help secure the windings in the slots even under the influence of centrifugal force, and secondly, it can provide fluid-based cooling within the slots through the cooling channel. Thus, the rotor windings are supported at a constant speed via this separator and simultaneously cooled.

According to a further preferred development of the invention, it can also be provided that the filler body has a fastening means on at least one of its end faces, with which the filler body is connected to a component axially adjacent to it. The advantage of this configuration is that the filler body can thus be securely fixed in a predefined position relative to the separating body. The fastening means also enables a modular design of the rotor arrangement with a compact axial structure. Furthermore, the fastening means helps ensure that the filler body, and thus indirectly also the separating body, can absorb high centrifugal forces from the windings acting on it when it is rotating, and also remains dimensionally stable under the influence of these external forces.

A fastening means can be selected from the group of positive fastening means, force-fitting fastening means and/or material-fit fastening means.

In one possible embodiment, a fastening means is designed as a screw thread that is formed integrally, preferably monolithically, with the filler body. The screw thread preferably protrudes from one of the end faces of the filler body. It may also be preferred for a first screw thread to protrude from a first end face of the filler body and a second screw thread to protrude from a second end face of the filler body.

Preferably, a fastening means is designed as a profile with a screw thread. In this context, it is particularly preferred that the profile extends through the filler body at least in sections and protrudes from one of the end faces of the filler body. It may be particularly preferred that the profile extends completely through the filler body and protrudes from one of the end faces of the filler body. The profile can be arranged rotatably or non-rotatably in the filler body. It is furthermore preferable that only the part of the profile protruding from one end face of the filler body has a screw thread. It may also be preferred that the profile has a substantially circular cross-sectional profile.

A fastening means can also be designed as an internal thread formed in the filler body, which is formed integrally, preferably monolithically, with the filler body. The internal thread preferably extends into one of the end faces of the filler body. It may also be preferred for a first internal thread to extend into a first end face of the filler body and a second internal thread to extend into a second end face of the filler body.

According to a further preferred embodiment of the invention, a fastening means can also be designed as a bushing with an internal thread, which is inserted into the filler body in a rotationally fixed manner. It may also be preferred that a first bushing is inserted into a first end face of the filler body and a second bushing is inserted into a second end face of the filler body.

In principle, it would also be possible to design a fastening means in such a way that it creates a connection to an axially adjacent component via a deformation. A possible example of this is a rivet boss. Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that the adjacent component is the fluid inlet element or the fluid outlet element, thereby providing an axially particularly compact embodiment of the rotor assembly.

According to another particularly preferred embodiment of the invention, the inner wall of the separating body can be flat in the region of the cooling fins protruding from the filler body, which can provide advantages, particularly in terms of manufacturing technology. In particular, it is conceivable in this context for the separating body to be formed by forming, for example, from a sheet metal. Manufacturing costs, for example, when using an extrusion process to produce the separating body, can also be particularly favorably influenced by the simplified geometry.

Furthermore, the invention can also be further developed such that the fluid inlet element and/or the fluid outlet element engage at least partially in the separating body and bear against the inner wall of the separating body. This allows for a high degree of tightness between the fluid inlet element and/or the fluid outlet element and the separating body. This design has also proven particularly advantageous with regard to absorbing and supporting centrifugal forces during operation of the rotor assembly.

In a likewise preferred embodiment of the invention, it can also be provided that the fluid inlet element and/or the fluid outlet element each have/have a hydraulic path for guiding the cooling medium in the radial direction. It can also be advantageous to further develop the invention such that the fluid inlet element and/or the fluid outlet element each have/have a hydraulic path for guiding the cooling medium in the axial direction. This makes it possible to form a channel system by means of which the cooling medium can be guided in a targeted manner into the cooling channel of the separating body and/or out of the separating body. A hydraulic path can comprise an open or closed channel, an inflow surface, a centrifugal section and/or a free-fall section.

In a further preferred embodiment, an inlet element and/or an outlet element can each have an axial opening. This allows the cooling medium to be guided through the respective axial opening into components axially adjacent to the inlet element and/or the outlet element.

In a likewise preferred embodiment, an outlet element can have an axial opening through which the cooling medium is thrown out of the rotor during operation and onto stator components located radially further outwards, so that additional cooling of the stator components can be achieved.

According to one embodiment, the rotor arrangement comprises a rotor shaft which is designed as a hollow shaft and has an opening in the radial direction for guiding the cooling medium.

According to a further preferred embodiment of the subject matter of the invention, it can be provided that the fluid inlet element and/or the fluid outlet element are/is each coupled to a rotor shaft configured as a hollow shaft, so that the cooling medium can flow from the rotor shaft into the fluid inlet element and/or from the fluid outlet element into the rotor shaft.

Preferably, the fluid inlet element and/or the fluid outlet element each contain a radial opening that is connected to a corresponding radial opening in the rotor shaft. Most preferably, the radial opening of the fluid inlet element and/or the fluid outlet element is sealed from the radial opening of the rotor shaft by a seal. This allows the cooling medium to be guided from the rotor shaft into the separating body or from the separating body into the rotor shaft without the need to integrate the cooling medium guide into axial rotor housing parts, allowing these to be designed to be particularly space-saving.

The radial opening of the rotor shaft is thus connected via the fluid inlet element and/or the fluid outlet element to the cooling channel of the separating element for guiding the cooling medium, thus forming a channel system. Thus, in a preferred embodiment of the invention, the cooling channel can be connected to a cooling system via the channel system. Particularly advantageously, the cooling channel is connected to the cooling system at both end faces via a respective additional component, preferably the fluid inlet element and/or the fluid outlet element, so that a closed cooling circuit is formed.

Finally, the invention can also be advantageously designed such that the filler body has, on its first end face, the fastening means with which the filler body is connected to a component axially adjacent to it, and that the filler body has, on a second end face, a fastening means with which the filler body is connected to a component axially adjacent to it.

In a further preferred development of the invention, it can also be provided that the separating body has electrical insulation on its outer wall, at least in sections. The electrical insulation can be designed, for example, as an electrically insulating coating. It is also conceivable for the electrical insulation to be designed as a separate component that is detachably or permanently connected to the separating body. The separating body can thus be electrically insulated from live parts, in particular to prevent electrical contact between excitation coils or between the excitation coil and the vehicle and thus to meet high-voltage safety requirements. A coating can be realized, for example, by painting, overmolding, or an adhesively bonded layer. For electrical insulation with limited requirements, the aluminum separating body can also be anodized, for example. In the case of more stringent requirements, it can be overmolded with plastic, coated with an alternative material, or covered with a film on the contact surfaces to the rotor coils. This ensures that no electrical short circuit occurs between excitation coils or between an excitation coil and the vehicle.

According to a further preferred embodiment of the subject matter of the invention, it can be provided that the separating body has a longitudinal has an extension that is greater than the longitudinal extension of the filler body. In this context, it is particularly preferred that the filler body is completely accommodated in the separating body and does not protrude axially from the separating body. It is especially preferred that the filler body is set back on one end face of the separating body. It is most preferred that the filler body is set back relative to the separating body on both end faces.

The separating body is preferably connected to a slot closure element that radially closes the slot and supports the support body at a fixed speed. The slot closure element is preferably made of a non-ferromagnetic and non-electrically conductive material, e.g., plastic, so that the electromagnetic behavior of the machine is not impaired and no additional eddy current losses occur in this component. The slot closure element can be manufactured using plastic injection molding or extrusion and joined to the separating body by form-fitting or adhesive bonding. Alternatively, the slot closure element can be injection-molded directly onto the separating body. In this case, it can be integrally connected to a plastic overmolding of the separating body.

The invention can also be advantageously embodied such that the slot closure element and the separating body are integrally connected. The advantageous effect of this design lies in the fact that the integral connection allows the slot closure element and the separating body to be manufactured as a single component. This reduces the complexity of the rotor arrangement. A further advantage lies in the fact that an integral connection provides a more stable component. Particularly preferably, the slot closure element and the separating body are monolithic, for example, made of aluminum or plastic.

In a likewise preferred embodiment of the invention, it can also be provided that the separating body is formed from aluminum. The separating body is preferably produced from aluminum by extrusion. The material properties of aluminum make it possible to achieve good mechanical properties as well as good thermal conductivity within the separating body. Since aluminum is not ferromagnetic, the electromagnetic function of the machine is not impaired. Alternatively, the separating body can be produced from plastic by extrusion, although this generally results in lower thermal conductivity.

Furthermore, the invention can also be further developed such that the at least two cooling channels are separated from one another by a web extending tangentially through the separating body in cross-section. Such a web can contribute to maintaining dimensional stability inside the separating body under the influence of high external centrifugal forces. In this way, the separating body can, in particular, also absorb centrifugal forces from the surrounding components without being deformed to a critical extent.

The outer cross-sectional contour of the separator can also have a contour that deviates from rectangular. The cross-sectional contour of the separator is preferably shaped so that the distance between the winding and the separator is as small as possible. For example, it would be conceivable for the separator to have a trapezoidal section at its radially outer end, with a rectangular section adjoining it radially inward on its short side. This can further optimize the heat transfer from the winding to the separator, since the thermal conductivity of the potting compound, which usually fills the cavity between the winding and the separator, is generally poorer than the thermal conductivity of the separator.

According to a further preferred development of the invention, the separating body can also comprise a plurality of cooling channels that are spaced apart radially and/or circumferentially. The advantageous effect of this design is that it provides better heat dissipation or dissipation of power loss. A further advantage is that a plurality of spaced-apart cooling channels provides more uniform heat dissipation or dissipation of power loss.

The object of the invention is further achieved by an electric machine, in particular for a drive train of a motor vehicle, comprising a rotor arrangement according to one of claims 1-12.

The invention will be explained in more detail below with reference to figures without limiting the general inventive concept.

• 1 eine segmentartige Querschnittsansicht durch eine Rotoranordnung,
• 2 eine Detailansicht auf eine Ausführungsform einer Rotoranordnung in einer Querschnittsdarstellung,
• 3 ein Trennkörper der Rotoranordnung mit seinen angrenzenden Bauteilen in einer Explosionsdarstellung,
• 4 eine Rotoranordnung in einer Axialschnittdarstellung,
• 5 ein Kraftfahrzeug mit einem elektrischen Antriebsstrang in einer schematischen Darstellung.

It shows:

• 1 a segmental cross-sectional view through a rotor arrangement,
• 2 a detailed view of an embodiment of a rotor arrangement in a cross-sectional view,
• 3 a separating body of the rotor arrangement with its adjacent components in an exploded view,
• 4 a rotor arrangement in an axial section,
• 5 a motor vehicle with an electric drive train in a schematic representation.

The 1 shows a rotor arrangement 1, comprising a rotor body 2, which forms a plurality of slots 3 in the axial direction for receiving a winding 4, as well as rotor poles 5, which are formed in the radial direction between two of the slots 3. The rotor arrangement 1 further has windings 4, which run in the slots 3 and enclose the rotor poles 5. The slots 3 are closed in the radial direction by slot closure elements 6. The slot closure elements 6 can, in particular, be formed integrally with the separating body 7.

The rotor arrangement 1 further comprises separating bodies 7, each of which is arranged in one of the slots 3 in the circumferential direction between two of the windings 4, wherein the separating body 7 comprises at least one continuous cooling channel 8 extending in the axial direction, through which a cooling medium can flow.

A filler body 11 made of a non-ferromagnetic material is positioned in the cooling channel 8. This filler body 11 has cooling fins 12 projecting from its surface in the direction of the inner wall 19 of the separating body 7, which are formed monolithically with the filler body 11. The inner wall 19 of the separating body 7 is flat in the area of the cooling fins 12 projecting from the filler body 11, as is also the case in the embodiment of the 2 can be clearly seen. The separating body 7 and the filling body 11, equipped with the cooling fins 12, thus have the option of offering an enlarged surface area to the cooling medium in the cooling channel 8 in order to enable effective heat transfer. Furthermore, the cooling medium is optimally guided along the outer contour of the separating body 7, which contributes to increasing the efficiency of heat transfer into the cooling medium. In the exemplary embodiment shown, the filling body 11 is designed in two parts, with a filling body part with a rectangular cross-section and a body part with a trapezoidal cross-section.

The separator 7 essentially fulfills two functions. On the one hand, it helps to keep the windings 4 stable in the slots 3 even under the influence of centrifugal forces, and on the other hand, it enables liquid-based cooling within the slots through the cooling channel 8. 3 As a result, the rotor windings 4 are held securely and firmly by the separator 7 and simultaneously cooled efficiently.

At the bottom of the groove 3, in the embodiment of the 2 a coupling means 38 extends radially outwards into the separating body 7 and forms a positive connection therewith, so that an improved support of centrifugal forces acting during operation of the rotor arrangement can be achieved.

The separating body 7 as well as the filling body 11 each have a radially outer section with a trapezoidal cross-section, from whose short, radially inner side a rectangular section extends radially inwards towards the rotor shaft 46. In this embodiment, the separating body 7 or the filling body 11 is reminiscent of a key in its cross-sectional contour. In this case, the filling body 11 is correspondingly designed in two parts, with the trapezoidal section forming a first part and the rectangular section a second part, which is also clearly evident from the synopsis of the 1 and 3 The separating body 7 has a radially outer and a radially inner cooling channel 8 through a web running in the circumferential direction.

The separating body 7 has an electrical insulation 37 on its outer wall 36, at least in sections, which is clearly evident from the 2 The isolation 37 can, as in the 2 shown, can be designed as a separate component or as a coating on the outer wall 36.

From the 3 It can be seen that the filler body 11 has a fastening means 31 on at least one of its end faces 30, with which the filler body 11 is connected to a component 32 axially adjacent to it. The fastening means 31 is in the embodiment variant of the 3 designed as a screw thread that is formed integrally, preferably monolithically, with the filler body 11. The screw thread extends out of an end face 30 of the filler body 11. In the embodiment shown, the 3 a second screw thread protrudes from the opposite end face 33 of the filler body 11 as a fastening means 34.

The fastening means 31 is designed as a profile with a screw thread, whereby the profile completely penetrates the filler body 11 and protrudes from the end faces. The profile is fixed within the filler body in a rotationally fixed manner. As can be seen from the 3 As can also be clearly seen, only the part of the profile that protrudes from a front side 30,33 of the filler body 11 is provided with a screw thread. The profile has an essentially circular cross-section. In the assembled state of the rotor assembly 1, the fastening means 34 extends through the receptacle 48 of the fluid outlet element 43 and is then secured with a nut. Similarly, the fastening means 31 also extends through the receptacle 47 of the fluid inlet element 41 and is also secured with a nut.

The adjacent component 32 is, on the one hand, the fluid inlet element 41 and, on the other hand, the fluid outlet element 43. The fluid inlet element 41 is coupled to a first axial end 40 of the cooling channel 8 and the fluid outlet element 43 is coupled to a second axial end 42 of the cooling channel 8, so that the cooling medium can flow into the cooling channel 8 via the fluid inlet element 41 and flow out of the cooling channel 8 via the fluid outlet element 43.

The separating body 7 has a longitudinal extension which is greater than the longitudinal extension of the filling body 11, wherein the filling body 11 is completely accommodated in the separating body 7 and does not protrude axially from the separating body, but is set back on both end faces relative to the separating body 7. From the synopsis of 3-4 It can then further be seen that the fluid inlet element 41 and the fluid outlet element 43 engage at least partially in the separating body 7 and bear against the inner wall 19 of the separating body 7. The fluid inlet element 41 and the fluid outlet element 43 have a contour 49 that corresponds to the contour of the inner wall 19 of the separating body 7.

The separating body 7 is designed in the region of its axial ends 40, 42 on its inner wall 19 such that a uniform inner contour is achieved over an axial length, preferably up to 15 mm. These regions can be formed by machining. During assembly of the rotor arrangement 1, a fluid inlet and a fluid outlet element 41, 43 for the cooling medium are then inserted in these regions and fixed in the separating body 7 by gluing, welding, a press fit, or positive joining. The fluid inlet and outlet elements 41, 43 can each be sealed off from the separating body 7 by means of a seal, such as an O-ring. This results in the creation of tight, enclosed assemblies with respect to the cooling medium, which are placed between each two windings 4, but without protruding significantly beyond the axial extent of the windings 4 of the rotor arrangement 1, so that the axial length of the rotor arrangement 1 is not significantly increased by these assemblies.

The fluid inlet and outlet elements 41, 43 have internal openings and/or channels that guide the cooling medium axially and/or radially, whereby the inner shape of the opening in the separating body 7 is adapted so that it is suitable for guiding the cooling medium into the adjacent components. For this purpose, the fluid inlet element 41 and the fluid outlet element 43 each have a hydraulic path 44 for guiding the cooling medium in the radial direction and a hydraulic path 45 for guiding the cooling medium in the axial direction, which is also indicated by the corresponding arrows in the 4 can be traced.

The fluid inlet element 41 and the fluid outlet element 43 are each coupled to a rotor shaft 46 configured as a hollow shaft, so that the cooling medium can flow from the rotor shaft 46 into the fluid inlet element 41 and from the fluid outlet element 43 into the rotor shaft 46. The fluid inlet element 41 and the fluid outlet element 43 each have a radial opening that is connected to a corresponding radial opening in the rotor shaft 46. Thus, the cooling medium can be guided from the rotor shaft 46 into the separating body 7 or from the separating body 7 into the rotor shaft 46 without the need to integrate the cooling medium guide into axial rotor housing parts, so that these can be designed to be particularly space-saving axially. The radial opening of the rotor shaft 46 is thus connected via the fluid inlet element 41 and the fluid outlet element 43 to the cooling channel 8 of the separating body 7 for guiding the cooling medium and accordingly forms a channel system, which can be clearly seen from the illustration of the 4 can be understood.

The filler body 11 has on its first end face 30 the fastening means 31, with which the filler body 11 is connected to a component 32 axially adjacent to it, and that the filler body 11 has on a second end face 33 a fastening means 34, with which the filler body 11 is connected to a component 35 axially adjacent to it.

The ones from the 1-4 The known rotor arrangement 1 can be designed in particular for an electric machine 50 for a drive train 51 of a motor vehicle 52, as is also shown by way of example in the 5 is shown.

The invention is not limited to the embodiments shown in the figures. The above description is therefore not to be regarded as limiting, but as explanatory. The following claims are to be understood in such a way that a named feature is present in at least one embodiment of the invention. This does not exclude the presence of further features. If the claims and the above description refer to 'first' and 'second' features define, this term serves to distinguish two similar characteristics without establishing a ranking.

List of reference symbols

1

Rotor arrangement

2

rotor body

3

grooves

4

winding

5

Rotor poles

6

Slot closure elements

7

Separator

8

cooling channel

11

packing

12

Cooling fins

19

interior wall

30

Front sides

31

Fasteners

32

component

33

front side

34

Fasteners

35

component

36

exterior wall

37

isolation

38

Coupling agent

40

End

41

Fluid inlet element

42

End

43

Fluid outlet element

44

Hydraulic path

45

Hydraulic path

46

rotor shaft

47

Recording

48

Recording

49

contour

50

electric machine

51

Drivetrain

52

motor vehicle

QUOTES CONTAINED IN THE DESCRIPTION

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

Cited patent literature

• EP 1 494 335 B1 [0004]
• DE 102018220810A1 [0005]
• EP 3618241A1 [0005]

Claims (12)

Rotor arrangement (1), comprising - a rotor body (2) which forms a plurality of slots (3) in the axial direction for receiving a winding (4), - rotor poles (5) which are formed in the radial direction between two of the slots (3), - windings (4) which run in the slots (3) and enclose the rotor poles (5), - slot closure elements (6) which close the slots (3) in the radial direction, - at least one separating body (7) which is arranged in one of the slots (3) in the circumferential direction between two of the windings (4), - wherein the separating body (7) comprises at least one continuous cooling channel (8) extending in the axial direction, through which a cooling medium can flow, characterized in that a fluid inlet element (41) is coupled to a first axial end (40) of the cooling channel (8) and a fluid outlet element (43) is coupled to a second axial end (42) of the cooling channel (8), so that the cooling medium can flow into the cooling channel (8) via the fluid inlet element (41) and flow out of the cooling channel (8) via the fluid outlet element (43). Rotor arrangement (1) according to Claim 1 , characterized in that a filling body (11) made of a non-ferromagnetic material is positioned in the cooling channel (8) and the filling body (11) has cooling fins (12) projecting from its surface in the direction of the inner wall (19) of the separating body (7). Rotor arrangement (1) according to Claim 1 or 2 , characterized in that the filling body (11) has on at least one of its end faces (30) a fastening means (31) with which the filling body (11) is connected to a component (32) axially adjacent to it. Rotor arrangement (1) according to Claim 3 , characterized in that the adjacent component (32) is the fluid inlet element (41) or the fluid outlet element (43). Rotor arrangement (1) according to one of the previous Claims 2 - 4 , characterized in that the inner wall (19) of the separating body (7) is flat in the region of the cooling fins (12) protruding from the filling body (11). Rotor arrangement (1) according to one of the preceding claims, characterized in that the fluid inlet element (41) and/or the fluid outlet element (43) engage at least in sections in the separating body (7) and bear/rest against the inner wall (19) of the separating body (7). Rotor arrangement (1) according to one of the preceding claims, characterized in that the fluid inlet element (41) and/or the fluid outlet element (43) each have/has a hydraulic path (44) for guiding the cooling medium in the radial direction. Rotor arrangement (1) according to one of the preceding claims, characterized in that the fluid inlet element (41) and/or the fluid outlet element (43) each have/has a hydraulic path (45) for guiding the cooling medium in the axial direction. Rotor arrangement (1) according to one of the preceding claims, characterized in that the fluid inlet element (41) and/or the fluid outlet element (43) are/is each coupled to a rotor shaft (46) configured as a hollow shaft, so that the cooling medium can flow from the rotor shaft (46) into the fluid inlet element (41) and/or from the fluid outlet element (43) into the rotor shaft (46). Rotor arrangement (1) according to one of the previous Claims 3 - 9 , characterized in that the filling body (11) has on its first end face (30) the fastening means (31) with which the filling body (11) is connected to a component (32) axially adjacent to it and that the filling body (11) has on a second end face (33) a fastening means (34) with which the filling body (11) is connected to a component (35) axially adjacent to it Rotor arrangement (1) according to one of the preceding claims, characterized in that the separating body (7) has an electrical insulation (37) on its outer wall (36) at least in sections. Electric machine (50), in particular for a drive train (51) of a motor vehicle (52), comprising a rotor arrangement (1) according to one of the preceding claims.

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