ROTOR AND ELECTRIC SYNCHRONOUS MACHINE FOR A MOTOR VEHICLE

Abstract

A rotor (1) for a current-excited synchronous machine is provided. The rotor (1) comprises a rotor shaft (2) having a main cooling fluid channel (21) extending in the axial direction (R) of the rotor (1), and a rotor lamination stack (3) that circumferentially surrounds the rotor shaft (2) and has a cavity (31) wherein the cavity (31) is adjacent to the rotor shaft (2) and extends in the axial direction (R). The rotor (1) comprises a cooling fluid channel body (4) which is inserted into the cavity (31) and has a cooling fluid channel (41) wherein the cooling fluid channel (41) has an open end (42) that is fluidically connected to the main cooling fluid channel (21).

Description

[0001] The present disclosure relates to a rotor for an electrically excited synchronous machine, an electrically excited synchronous machine comprising the rotor, and / or a motor vehicle comprising the electrically excited electric machine.

[0002] Electric machines can be used in motor vehicles, for example as traction motors. Various designs of electric machines are known, such as synchronous motors. These include single-phase and three-phase synchronous motors in motor operation, in which a rotor is driven synchronously by a rotating magnetic field in the stator during normal operation. The energy provided by the magnetic interaction between the stator and the rotor can be extracted via the rotation of the rotor and used, for example, to power the electrically driven vehicle or another machine within the vehicle.

[0003] Currently, a rotor for a current-excited synchronous machine (SSM rotor) is typically designed such that the windings are wound around the salient poles, and star disks are arranged at each end of the rotor lamination stack, forming the winding head. Support rings are also required to secure the star disks and the underlying winding heads against centrifugal force. Due to these components (i.e., the support rings and star disks), the SSM rotor requires significantly more axial space at each end of the lamination stack compared to a rotor for a permanent magnet synchronous machine (i.e., with permanent magnets instead of current-carrying windings). Cooling of the SSM rotor is currently typically achieved through fluid cooling within the rotor shaft and / or additional fluid cooling of the end caps by injection molding the cooling medium onto the end caps.

[0004] Without a compact end-cap design, a large axial space requirement for the winding heads is necessary. A plug-in coil design, in conjunction with the support elements (i.e., the support rings and star disks), allows for an effective reduction in the size of the winding heads. However, even with a plug-in coil design, it is necessary to protect the winding heads of the coil formers and secure them axially against slippage. Cooling the SSM rotor via the rotor shaft has the disadvantage that the heat sink is located very far from the heat source (the coils) and is separated by numerous interfaces and heat transfer points, thus limiting the amount of heat that can be extracted. Additional cooling via injection molding of the end caps with the cooling medium has similar problems, as the end caps are usually connected to the coils via a plastic-based potting compound, which, however, has very poor thermal conductivity.Cracks and fissures in the potting compound can further exacerbate this effect.

[0005] US 2022 / 0399770 A1 describes a rotating liquid-cooled electric machine comprising a permanent magnet rotor and a wound stator, wherein the rotor includes at least one lamination stack, magnets housed within the lamination stack, and front and rear flanges adjacent to the lamination stack, and wherein the electric machine is configured to allow cross-flow of the cooling fluid within the lamination stack.

[0006] EP 3 687 038 A1 describes an electric motor comprising a housing, a stator provided in a receiving space of the housing, a rotor having a rotor core rotatably mounted within the stator with an air gap between them, and a rotating shaft having a hollow section and a plurality of injection holes for the rotating shaft formed on a central section thereof, such that a cooling fluid introduced into the hollow section is sprayed through the plurality of injection holes into the rotor core. A plurality of cooling channels are provided in the rotor core, one side of which is connected to each of the plurality of injection holes and the other side of which is connected to the receiving space, so that the cooling fluid is sprayed in different directions towards opposite ends of a central section of the rotor core.

[0007] DE 10 2018 222 469 A1 describes a rotor for an electric motor, comprising a rotor shaft, a rotor core which is held non-rotatably on the rotor shaft and comprises a plurality of sheet metal laminations and which has a plurality of eccentric cavities penetrating the sheet metal laminations in an axial direction, a plurality of permanent magnets which are arranged in series and fixed in at least some of the eccentric cavities, and a cooling channel which comprises the plurality of eccentric cavities.

[0008] Against the background of this prior art, the purpose of the present disclosure is to specify a device and / or a method, each of which is suitable to enrich the prior art.

[0009] The problem is solved by the features of the independent claims. The dependent and subordinate claims each contain optional further developments of the disclosure.

[0010] The task is then solved by a rotor for a current-excited (or separately excited) synchronous machine.

[0011] The rotor includes a rotor shaft which has a main cooling fluid channel extending in the axial direction of the rotor (and / or the rotor shaft).

[0012] The rotor comprises a rotor lamination stack that surrounds the rotor shaft circumferentially and has (at least) one cavity (also: hollow space and / or receiving pocket), wherein the cavity is formed adjacent to the rotor shaft and extends in the axial direction (of the rotor and / or the rotor shaft).

[0013] The rotor comprises (at least) a cooling fluid channel body that is inserted (and / or joined) into the cavity and has a cooling fluid channel. The cooling fluid channel has an open end. The open end is fluidically connected to the main cooling fluid channel.

[0014] The rotor lamination stack can have multiple cavities, each of which can be located adjacent to the rotor shaft and extend in the axial direction (of the rotor and / or the rotor shaft). The multiple cavities can be identical in design.

[0015] The rotor can comprise several cooling fluid channel bodies, each inserted (and / or joined) into one of the multiple cavities and each containing a cooling fluid channel. The multiple cooling fluid channel bodies can be identical in design.

[0016] The term "adjacent" can be understood to mean that the cavity is located closer to the rotor shaft in the radial direction of the rotor than to an outer circumferential surface (or outer shell) of the rotor lamination stack (i.e., the distance between the cavity and the rotor shaft can be smaller than the distance between the cavity and the outer circumferential surface of the rotor lamination stack). A section of the rotor lamination stack may be positioned between the cavity and the rotor shaft. Alternatively, it is conceivable that the cavity may be open towards the rotor shaft and / or that the cooling fluid channel body rests against the rotor shaft.

[0017] The rotor described above offers a number of advantages. Among other things, it provides a modular and pluggable design. The cooling fluid channel body, designed as a plug-in element, enables simple and reliable assembly of the rotor and, in particular, its cooling. At the same time, the rotor is disassemblable and recyclable. The plug-in cooling fluid channel body, together with the rotor shaft, provides an effective and simply designed cooling system. During rotor operation, the cooling fluid (also called cooling medium) is forced radially outwards in the main cooling fluid channel by centrifugal force and then, via the fluidic connection, into the cooling fluid channel of the main cooling fluid body. There, it effectively cools the rotor lamination stack and the rotor coils.

[0018] Possible further developments of the rotor described above are explained in detail below.

[0019] The cavity can be open at at least one axial end or at both axial ends. The main cooling fluid body can be inserted axially into the cavity.

[0020] The cooling fluid channel can branch into a first sub-channel and a second sub-channel. The first sub-channel can extend (e.g., in the axial direction of the rotor and / or rotor shaft) to a first longitudinal end of the cooling fluid channel body. The second sub-channel can extend (e.g., in the axial direction of the rotor and / or rotor shaft) to a second longitudinal end of the cooling fluid channel body.

[0021] The first sub-channel can have an open end (or a first open sub-channel end) that can be formed at the first longitudinal end of the cooling fluid channel body. The second sub-channel can have an open end (or a second open sub-channel end) that can be formed at the second longitudinal end of the cooling fluid channel body.

[0022] The cooling fluid channel can extend from the open end to the axially central region of the cooling fluid channel body and branch out in the central region.

[0023] The cooling fluid channel can have a third sub-channel that extends (e.g., at least partially in the axial direction of the rotor and / or rotor shaft) from the open end to a branching point of the cooling fluid channel. At the branching point, the third sub-channel can divide into the first and second sub-channels.

[0024] The open end of the cooling fluid channel can be located at the first or second longitudinal end of the cooling fluid channel body. The open end can be adjacent to the open end of the first sub-channel (or the first open sub-channel end) or to the open end of the second sub-channel (or the second open sub-channel end).

[0025] The first longitudinal end of the cooling fluid channel body can be located at a first axial end of the rotor lamination stack. The second longitudinal end of the cooling fluid channel body can be located at a second axial end of the rotor lamination stack. The cooling fluid channel body can extend from the first axial end of the rotor lamination stack to the second axial end of the rotor lamination stack.

[0026] The rotor shaft can be designed, for example, as a hollow cylinder (or annular cylinder) and / or as a tube. The main cooling fluid channel can be an interior formed by the hollow cylinder and / or the tube. The main cooling fluid channel can be closed at one end by a sealing plug.

[0027] The rotor can include a first distribution channel arrangement located outside the rotor lamination stack at the first longitudinal end of the cooling fluid channel body and fluidically connected to the first sub-channel of the cooling fluid channel.

[0028] The rotor can comprise several first distribution channel assemblies, each located outside the rotor lamination stack at the first longitudinal end of one of several cooling fluid channel bodies (and fluidically connected to the first sub-channel of the cooling fluid channel of one of the several cooling fluid channel bodies). The several first distribution channel assemblies can be of identical design.

[0029] The rotor may include a second distribution channel arrangement located outside the rotor lamination stack at the second longitudinal end of the cooling fluid channel body and fluidically connected to the second sub-channel of the cooling fluid channel.

[0030] The rotor can comprise several secondary distribution channel assemblies, each located outside the rotor lamination stack at the second longitudinal end of one of several cooling fluid channel bodies (and fluidically connected to the second sub-channel of the cooling fluid channel of one of the several cooling fluid channel bodies). The multiple primary distribution channel assemblies can be of identical design.

[0031] The first distribution channel arrangement and / or the second distribution channel arrangement can each have two spaced-apart channel arms. The two channel arms can extend outwards (each) along the rotor lamination stack in the radial direction of the rotor (and / or the rotor shaft) and can, for example, be designed to be open to the outside in the radial direction (of the rotor and / or the rotor shaft).

[0032] The first distribution channel arrangement can include an intermediate arm (or connecting arm) that joins the two channel arms. The two channel arms and the intermediate arm of the first distribution channel arrangement can be tubular, e.g., formed from a single piece of bent tubing or as an arrangement of fluidically connected tubes. The two channel arms and the intermediate arm of the first distribution channel arrangement can form fluidically connected channels.

[0033] The first distribution channel assembly can have a first distribution channel opening for fluidic connection to the first sub-channel (and / or the open end of the first sub-channel). The first distribution channel assembly can, for example, be designed to establish the fluidic connection to the first sub-channel (and / or the open end of the first sub-channel) via a plug connection. The first distribution channel assembly can have a protrusion that can be plugged into the open end of the first sub-channel. The first distribution channel opening can be formed on this protrusion.

[0034] The second distribution channel arrangement can include an intermediate arm (or connecting arm) that joins the two channel arms. The two channel arms and the intermediate arm can be tubular, e.g., formed from a single piece of bent tubing or as an arrangement of fluidically connected tubes. The two channel arms and the intermediate arm can form fluidically connected channels.

[0035] The second distribution channel assembly can have a second distribution channel opening for fluidic connection to the second sub-channel (and / or the open end of the second sub-channel). The second distribution channel assembly can, for example, be designed to establish the fluidic connection to the second sub-channel (and / or the open end of the second sub-channel) via a plug connection. The second distribution channel assembly can have a protrusion that can be plugged into the open end of the second sub-channel. The second distribution channel opening can be formed on this protrusion.

[0036] The rotor can include several (e.g., current-carrying) plug-in coils. These multiple plug-in coils can be inserted (and / or joined) into the rotor lamination stack and, for example, protrude axially (i.e., in the axial direction of the rotor, the rotor lamination stack, and / or the rotor shaft) beyond the rotor lamination stack.

[0037] The multiple plug-in coils can, for example, comprise a first plug-in coil and a second plug-in coil arranged adjacent to each other in the circumferential direction of the rotor. The cooling fluid channel body can be arranged in the circumferential direction of the rotor between the first and second plug-in coils. One of the two channel arms of the first distribution channel arrangement and / or the second distribution channel arrangement can run along an end section of the first plug-in coil, for example, such that one of the two channel arms directly touches (or makes contact with) the end section of the first plug-in coil (and / or a winding of the first plug-in coil). The other of the two channel arms of the first distribution channel arrangement and / or the second distribution channel arrangement can run along an end section of the second plug-in coil, for example, such that the other of the two channel arms directly touches (or makes contact with) the end section of the second plug-in coil (and / or a winding of the second plug-in coil).This allows the cooling fluid to be advantageously jetted radially outwards along the plug-in coils at the rotor ends, thereby creating internal splash cooling for the stator winding heads.

[0038] The rotor can include a first end disk located at a first axial end of the rotor lamination stack. The first distribution channel assembly can be located between the first end disk and the rotor lamination stack.

[0039] The rotor can include a second end disk located at a second axial end of the rotor lamination stack. The second distribution channel assembly can be arranged between the second end disk and the rotor lamination stack.

[0040] The first end disk and / or the second end disk can (each) be designed as an annular disk and / or have a central (e.g., circular) shaft opening for receiving the rotor shaft. The first end disk and / or the second end disk can (each) have at least one (e.g., rectangular) opening for receiving and / or passing through an end section of the plug-in coil (or one of several plug-in coils). The number of openings (for receiving and / or passing through an end section) can correspond to the number of plug-in coils of the rotor. The first end disk and / or the second end disk can (each) have a metallic base.

[0041] The first end plate can have (at least) one recess for receiving the first distribution channel assembly (or recesses for receiving each of the first distribution channel assemblies). The second end plate can have (at least) one recess for receiving the second distribution channel assembly (or recesses for receiving each of the second distribution channel assemblies).

[0042] The recess in the first end plate can have a shape to (optionally completely) accommodate the two channel arms (and optionally the intermediate arm) of the first distribution channel arrangement. The recess in the second end plate can have a shape to (optionally completely) accommodate the two channel arms (and optionally the intermediate arm) of the second distribution channel arrangement.

[0043] The first distribution arrangement can be configured such that the two channel arms (in the radial direction of the rotor and / or the rotor shaft) extend along edges of two adjacent openings of the first end disk and / or the first distribution channel opening is arranged facing away from the first end disk. The second distribution arrangement can be configured such that the two channel arms (in the radial direction of the rotor and / or the rotor shaft) extend along edges of two adjacent openings of the second end disk and / or the second distribution channel opening is arranged facing away from the second end disk.

[0044] The first end disk can have a first insulating body (e.g., for electrical insulation). The first insulating body can be arranged between the first end disk and the rotor lamination stack. The first insulating body can extend between the first end disk and the multiple plug-in coils of the rotor and / or at least partially around the first distribution channel assembly (e.g., if the first distribution channel assembly is made of an electrically conductive material, such as a metal).

[0045] The second end disk can have a second insulating body (e.g., for electrical insulation). The second insulating body can be arranged between the second end disk and the rotor lamination stack. The second insulating body can extend between the second end disk and the multiple plug-in coils of the rotor and / or at least partially around the second distribution channel assembly (e.g., if the second distribution assembly is made of an electrically conductive material, such as a metal).

[0046] The (first and / or second) insulating body can (each) be designed as an annular layer. The first (or second) insulating body can be applied to a side surface of the first (or second) end plate in which the recess for the first (or second) distribution channel opening is formed. The first (or second) insulating body can, for example, be applied in such a way that the first (or second) distribution arrangement, e.g., the two channel arms of the first (or second) distribution arrangement, is at least partially covered by the first (or second) insulating body.

[0047] The rotor shaft can have at least one passage. This passage can be located on a surface of the rotor shaft and extend to the main cooling fluid channel.

[0048] The rotor shaft can have multiple passages (e.g., three passages) that can be spaced apart from each other in the circumferential direction of the rotor shaft (e.g., at equal intervals). The multiple passages can be arranged side-by-side on a circle in the circumferential direction of the rotor shaft and / or in the circumferential direction of the rotor shaft.

[0049] The rotor can include a collecting and distributing body. The collecting and distributing body can be configured to fluidically connect the at least one passage of the rotor shaft and the open end of the cooling fluid channel. The collecting and distributing body can be arranged at least partially outside the rotor lamination stack on the rotor shaft.

[0050] The collecting and distributing body can be ring-shaped and / or have a ring-shaped base. The collecting and distributing body can circumferentially surround a section of the rotor shaft's outer surface where at least one passage (or passages) are formed.

[0051] The collecting and distributing body can be designed to fluidically connect one of several passages of the rotor shaft to one of several open ends of several cooling fluid channels (multiple cooling fluid channel bodies).

[0052] The collecting and distributing body can have at least one distribution channel that is fluidically connected or connectable to at least one passage of the rotor shaft and the open end of the cooling fluid channel. The collecting and distributing body can have several distribution channels, each of which is fluidically connected or connectable to one of several passages of the rotor shaft and one of several open ends of several cooling fluid channels (multiple cooling fluid channel bodies).

[0053] The collecting and distributing body can have at least one projection in which at least one distribution channel can be formed. The collecting and distributing body can have several projections, each of which can contain one of several distribution channels.

[0054] The at least one distribution channel (or each of the multiple distribution channels) can have a distribution opening for fluidic connection with the open end of the cooling fluid channel. Furthermore, the at least one distribution channel (or each of the multiple distribution channels) can have another distribution opening for fluidic connection with the at least one passage of the rotor shaft (or one of the multiple passages).

[0055] The collecting and distributing body can be designed to establish the fluidic connection with the open end of the cooling fluid channel (or with the multiple open ends of multiple cooling fluid channels) via a plug connection.

[0056] As previously mentioned, the rotor can include several plug-in coils that are inserted (and / or joined) into the rotor lamination stack (and, for example, project axially beyond the rotor lamination stack). The rotor can also include several cooling fluid channel bodies. The number of plug-in coils can correspond to the number of cooling fluid channel bodies. Each cooling fluid channel body can be arranged circumferentially around the rotor between two plug-in coils.

[0057] The rotor lamination stack can have multiple cavities. The number of plug-in coils can correspond to the number of cavities. One plug-in coil can be inserted (and / or joined) into each cavity. Each cavity can be positioned between two plug-in coils in the circumferential direction of the rotor.

[0058] The rotor lamination stack can have several plug-in coil cavities, into each of which one of the multiple plug-in coils is inserted (and / or joined). Alternatively, or additionally, the rotor lamination stack can have poles that can be spaced apart from each other in the circumferential direction of the rotor (e.g., at regular intervals). The poles can each extend radially in the direction of the rotor. The plug-in coils can each be inserted (and / or joined) between two of the poles.

[0059] The rotor can be a salient-pole rotor. The poles can be designed as salient poles, each consisting, for example, of a pole core and a pole shoe. Each pole shoe can have two end sections that extend beyond the respective pole core in the circumferential direction of the rotor (optionally on both sides and / or on opposite sides of the pole shoe). The plug-in coils can be inserted and / or joined between the pole cores of two poles, with the pole shoes of the two poles extending at least partially beyond the respective plug-in coils in the radial and circumferential direction of the rotor.

[0060] The rotor lamination stack can be ring-shaped and / or cylindrical. The rotor lamination stack can have a central shaft opening in which the rotor shaft can be received.

[0061] The above can be summarized in other words and in a possible more concrete elaboration of the revelation as described below, whereby the following description is to be interpreted as not being restrictive for the revelation.

[0062] According to the present disclosure, for the embodiment with plug-in coil formers (i.e., plug-in coils) in the rotor lamination stack, cooling channels can exist, and the cooling fluid (or cooling medium) can be selectively jetted radially outwards along the coil formers at the rotor ends to create internal spray cooling for the stator winding heads. To ensure that the assembly of this cooling system is simple, reliable, and suitable for disassembly and recycling, the present rotor cooling system can be designed to be modular and pluggable. The cooling fluid can be conveyed from the rotor through openings (via centrifugal force) and collected via a collecting and distributing body. Cooling fluid channel bodies (also: cooling medium channel bodies) can be positioned in corresponding openings in the rotor lamination stack and fluidically connected to the collecting and distributing body. These cooling fluid channel bodies can be connected to further channel structures (i.e.,the distribution channel arrangements) are connected to the rotor ends, which may be integrated into the end disks for the rotor.

[0063] Furthermore, a current-excited synchronous machine (SSM for short) for a motor vehicle is provided, which includes the rotor described above.

[0064] The electrically excited synchronous machine can include a stator that surrounds the rotor at least circumferentially. The stator can have windings (or coils) that can be supplied with alternating current and / or three-phase current to drive the rotor.

[0065] What has been described above with reference to the rotor also applies analogously to the current-excited synchronous machine and vice versa.

[0066] Furthermore, a motor vehicle will be provided which includes the electrically excited synchronous machine and / or the rotor described above.

[0067] The motor vehicle can be an electrically powered motor vehicle or an electric vehicle. The electrically excited synchronous machine can be designed as a traction motor or traction machine for the motor vehicle.

[0068] The motor vehicle may include an electrical source, e.g. a traction battery, for supplying electrical energy to the stator (or the windings of the stator), e.g. via at least one inverter with alternating current.

[0069] The electrical source can be designed to supply the plug-in coils of the rotor with electrical energy, e.g. with a direct current.

[0070] The motor vehicle can be a passenger car, in particular an automobile, or a commercial vehicle, such as a truck.

[0071] What has been described above with reference to the rotor and the electrically excited synchronous machine also applies analogously to the motor vehicle and vice versa.

[0072] The following are optional embodiments with reference to Fig. 1 to 6 described. Fig. Figure 1 schematically shows a section of a sectional view of a rotor as disclosed, Fig. Figure 2 schematically shows four views of a cooling channel system of the rotor according to the disclosure, with each view including one or more additional components of the cooling channel system, Fig. Figure 3 schematically shows four views of the rotor according to the disclosure, with each view showing one or more further components of the cooling channel system. Fig. 2 have been added, Fig. Figure 4 schematically shows four views of a first and second end disk and first and second distribution channel arrangements in individual and pre-assembled representations. Fig. Figure 5 schematically shows a view of the rotor with separate end disks and a view of the rotor according to disclosure with end disks mounted, and Fig. Figure 6 schematically shows a motor vehicle according to the disclosure, which includes a current-excited synchronous machine according to the disclosure.

[0073] In Fig. Figure 1 shows a section of the rotor 1, which is only schematically depicted and is designed, for example, for a current-excited synchronous machine.

[0074] The rotor 1 comprises a rotor shaft 2 which has a main cooling fluid channel 21 extending in the axial direction R of the rotor 1 (or the rotor shaft 2).

[0075] The rotor 1 comprises a rotor lamination stack 3 that circumferentially surrounds the rotor shaft 2 and has at least one cavity 31, wherein the cavity 31 is formed adjacent to the rotor shaft 2 and extends in the axial direction R. The rotor 1 can also have several cavities 31.

[0076] The rotor 1 comprises at least one cooling fluid channel body 4, which is inserted into the cavity 31 and has a cooling fluid channel 41, wherein the cooling fluid channel 41 has an open end 42 that is fluidically connected to the main cooling fluid channel 21. The rotor 1 can also comprise several cooling fluid channel bodies 4, each inserted into one of several cavities 31 and each having a cooling fluid channel 41. The multiple cooling fluid channel bodies 4 can be of identical design.

[0077] To establish the fluidic connection, the rotor shaft 2 can have at least one passage 22 formed on a lateral surface 23 of the rotor shaft 2 and extending to the main cooling fluid channel 21. The rotor 1 can, for example, comprise a collecting and distributing body 7, which can be configured to fluidically connect the at least one passage 22 of the rotor shaft 2 and the open end 42 of the cooling fluid channel 41, wherein the collecting and distributing body 7 can be arranged at least partially outside the rotor lamination stack 3 on the rotor shaft 2.

[0078] The open end 42 of the cooling fluid channel 41 can, for example, be formed at a first longitudinal end 43 of the cooling fluid channel body 4, wherein the first longitudinal end 43 can be arranged at a first axial end of the rotor lamination stack 3. Correspondingly, the collecting and distributing body 7 can be arranged at the first longitudinal end 43. Alternatively, it is conceivable that the open end 42 can be formed at a second longitudinal end 44 of the cooling fluid channel body 4, wherein the second longitudinal end 44 can be arranged at a second axial end of the rotor lamination stack 3, so that the collecting and distributing body 7 can be arranged at the second longitudinal end 44.

[0079] The rotor shaft 2 can be designed, for example, as a hollow cylinder or a tube. The main cooling fluid channel 21 can be an interior formed by the hollow cylinder or the tube. The main cooling fluid channel 21 can be closed at one end by a sealing plug 11, so that the cooling fluid is directed into the cooling fluid channel 41 via the fluidic connection, e.g., via the collecting and distributing body 7.

[0080] In the illustrated embodiment, the cooling fluid channel 41 is branched into a first sub-channel 41.1 and a second sub-channel 41.2. The first sub-channel 41.1 extends (e.g., in the axial direction R) to a first longitudinal end 43 of the cooling fluid channel body 4, while the second sub-channel 41.2 extends (e.g., in the axial direction R) to a second longitudinal end 44 of the cooling fluid channel body 4.

[0081] The cooling fluid channel 41 can extend from the open end 42 (and thus, for example, from the first longitudinal end 43 of the cooling fluid channel body 4) to a central region 45 of the cooling fluid channel body 4 in the axial direction and branch in this central region 45. The cooling fluid channel 41 can also have a third sub-channel 41.3, which extends (for example, at least partially in the axial direction R) from the open end 42 to a branching point 41.4 of the cooling fluid channel 41 and branches at the branching point 41.4 into the first sub-channel 41.1 and the second sub-channel 41.2.

[0082] The rotor 1 can include a first end disk 8, which is arranged at the first axial end of the rotor lamination stack 3. Additionally, the rotor can include a (in Fig. 1 (not shown) second end disk 9, which is arranged at the second axial end of the rotor lamination stack 3.

[0083] The rotor 1 can further comprise one or more plug-in coils 10, which can be plugged into the rotor lamination stack 3 and can project axially beyond the rotor lamination stack 3.

[0084] Furthermore, the rotor 1 can comprise one or more distribution channel arrangements, which are discussed in more detail in the following figures. In the sectional view of the Fig. Figure 1 shows, by way of example, only a channel arm 61 of a second distribution channel arrangement 6, which is fluidically connected to the second partial channel 41.2 of the cooling fluid channel 41 and extends outwards in the radial direction of the rotor 1 and is designed to be open in the radial direction outwards.

[0085] In the Fig. Figure 1 further illustrates the flow direction of a coolant guided within the cooling channel system of rotor 1, indicated by the arrows. The coolant initially flows through the main coolant channel 21 and is thus guided into the rotor 1. The sealing plug 11 prevents the coolant from flowing further within the main coolant channel 21. Instead, during operation of the rotor 1, i.e., during rotation of the rotor 1, the centrifugal force forces the coolant radially outwards and thus towards the passage 22. This causes the coolant to flow through the passage 22 and via the collecting and distributing element 7 into the coolant channel 41 of the coolant channel body 4. The coolant then flows through the open end 42 into the third sub-channel 41.3, through which it is guided to the central region 45 of the coolant channel body 4. In the middle section 45, the cooling fluid splits at the junction 41.4 onto the first sub-channel 41.1 and the second sub-channel 41.2. In the second sub-channel 41.2, the cooling fluid is directed to the second longitudinal end 44 and into the second distribution channel arrangement 6. In the second distribution channel arrangement 6, the cooling fluid is directed, among other things, within the channel arm 61 along an end section of the plug-in coil 10 and finally discharged to the outside. Similarly, in the first sub-channel 41.1, the cooling fluid is directed to the opposite, first longitudinal end 43 and into a (in . . Fig. 1 (not shown) first distribution channel arrangement 5, where it is finally also output to the outside.

[0086] Fig. Figure 2 schematically shows four views (a)-(d) of the cooling channel system of rotor 1, with one or more additional components of the cooling channel system being added in each view. In particular, rotor 1 is shown in these views without the rotor lamination stack 3 in order to better illustrate various aspects of the present disclosure. It is conceivable that the four views (a)-(d) in the sequence shown could represent individual stages of the cooling channel system during its manufacture or assembly, and thus individual process steps for the manufacture of the cooling channel system or rotor 1.

[0087] In Fig. Figure 2(a) shows the rotor shaft 2, designed, for example, as a hollow cylinder or tube, which has several of the passages 22. These passages 22, which are formed on the outer surface 23 of the rotor shaft 2 and each extend to the main cooling fluid channel 21, can be spaced apart from each other in the circumferential direction of the rotor shaft 2, for example, at equal intervals. The rotor shaft 2 can, for example, have three passages 22, although only two of the passages 22 are visible in the view shown.

[0088] In Fig. Figure 2(b) additionally shows the collecting and distributing body 7, which is arranged on the rotor shaft 2. The collecting and distributing body 7 is annular in shape and circumferentially surrounds a section of the outer surface 23 of the rotor shaft 2, in which the passages 22 are formed.

[0089] The collecting and distributing body 7 has several projections 71, each containing a distribution channel, with each distribution channel being fluidically connected to one of the passages 22 of the rotor shaft 2. Accordingly, the projections 71 are each arranged in the region of one of the passages 22.

[0090] Each distribution channel has a distribution opening 72 for fluidic connection with the open end 42 of the cooling fluid channel 41. In addition, each distribution channel has a further distribution opening (not shown) for fluidic connection with one of the passages 22.

[0091] In the illustrated embodiment, the collecting and distributing body 7 has three distribution channels, each configured to fluidically connect one of the three passages 22 with an open end 42. In other words, the collecting and distributing body 7 is configured to direct a cooling fluid from the main cooling fluid channel 21 into three cooling fluid channels 41 and thus into three cooling fluid channel bodies 4.

[0092] The collecting and distributing body 7 can, for example, be designed to establish a fluidic connection with the open end 42 of the cooling fluid channel 41, or with the multiple open ends 42 of several cooling fluid channels 41, via a plug connection. For this purpose, the collecting and distributing body 7 can have several (e.g., plug-shaped and / or nose-shaped) projections, each of which can be plugged into one of the open ends 42. One of the distribution openings 72 is formed on each of the projections.

[0093] In Fig. 2(c) The arrangement or cooling channel system shown additionally includes several cooling fluid channel bodies 4. More precisely, the arrangement includes three cooling fluid channel bodies 4, of which only two are shown in the illustrated view.

[0094] The cooling fluid channel bodies 4 are arranged on the collecting and distribution body 7 and connected to it, for example, via plug connections. The cooling fluid channel bodies 4 are identical and thus each has the cooling fluid channel 41 with the open end 42, wherein the respective open end 42 is fluidically connected via the collecting and distribution body 7 to one of the passages 22 of the rotor shaft 21.

[0095] As can be seen, an open end 47 of the second sub-channel 41.2 (or a second open sub-channel end 47) is formed at the second longitudinal end 44 of the respective cooling fluid channel body 4. Similarly, an open end 46 of the first sub-channel 41.1 (or a first open sub-channel end 46) can be formed at the first longitudinal end 43 of the respective cooling fluid channel body 4. The open end 46 can be located adjacent to the open end 42. Since the respective first longitudinal end 43 of the cooling fluid channel body 4 is shown in the view of the Fig. Since 2(c) is not recognizable, the open ends 42, 46 are also not shown in the view.

[0096] As previously mentioned, the rotor 1 can comprise one or more distribution channel arrangements. Thus, the rotor 1 can comprise a first distribution channel arrangement 5 and / or a second distribution channel arrangement 6. The first distribution channel arrangement 5 can be located outside the rotor lamination stack 3 at the first longitudinal end 43 of the cooling fluid channel body 4 and be fluidically connected to the first sub-channel 41.1 of the cooling fluid channel 41. Similarly, the second distribution channel arrangement 6 can be located outside the rotor lamination stack 3 at the second longitudinal end 44 of the cooling fluid channel body 4 and be fluidically connected to the second sub-channel 41.2 of the cooling fluid channel 41.

[0097] In Fig. 2(d) these distribution channel arrangements 5, 6, in addition to those already in Fig. 2(c) shows the components of the rotor 1 or the cooling channel system of the rotor 1. Each cooling fluid channel body 4 has a first distribution channel arrangement 5 at its first longitudinal end 43 and a second distribution channel arrangement 6 at its second longitudinal end 44.

[0098] The respective first distribution channel arrangement 5 has two spaced-apart channel arms 51, 52 which extend outwards in the radial direction of the rotor 1 and are designed to be open outwards in the radial direction (e.g. for the discharge of the cooling fluid).

[0099] The first distribution channel arrangement 5 further comprises an intermediate arm 53 (or connecting arm) that connects the two channel arms 51, 52 (fluidically, among other things). The two channel arms 51, 52 and the intermediate arm 53 can be tubular in form, e.g., as a single piece of bent tubing or as an arrangement of fluidically connected tubes. In other words, the intermediate arm 53 and the two channel arms 51, 52 can form fluidically connected channels.

[0100] The first distribution channel arrangement 5 can be a (in Fig. 2(d) (not shown) first distribution channel opening for fluidic connection with the first sub-channel 41.1 or the open end 46 of the first sub-channel 41.1. The first distribution channel arrangement 5 can, for example, be configured to establish the fluidic connection with the first sub-channel 41.1 or the open end 46 of the first sub-channel 41.1 via a plug connection. For this purpose, the first distribution channel arrangement 5 can have a protrusion (e.g., plug-shaped and / or nose-shaped) that can be plugged into the open end 46 of the first sub-channel 41.1. The first distribution channel opening can be formed on the protrusion.

[0101] Analogous to the first distribution channel arrangement 5, the respective second distribution channel arrangement 6 has two spaced-apart channel arms 61, 62 which extend outwards in the radial direction of the rotor 1 and are designed to be open outwards in the radial direction (e.g. for the discharge of the cooling fluid).

[0102] The second distribution channel arrangement 6 further comprises an intermediate arm 63 (or connecting arm) that connects the two channel arms 61, 62 (fluidically, among other things). The two channel arms 61, 62 and the intermediate arm 63 can be tubular in form, e.g., as a single piece from a bent tube or as an arrangement of fluidically connected tubes. Thus, the intermediate arm 63 and the two channel arms 61, 62 can form fluidically connected channels.

[0103] The second distribution channel arrangement 6 can be a (in Fig. 2(d) (not shown) second distribution channel opening for fluidic connection with the second sub-channel 41.2 or the open end 47 of the second sub-channel 41.2. The second distribution channel arrangement 6 can, for example, be configured to establish the fluidic connection with the second sub-channel 41.2 or the open end 47 of the second sub-channel 41.2 via a plug connection. For this purpose, the second distribution channel arrangement 6 can have a protrusion (e.g., plug-shaped and / or nose-shaped) that can be plugged into the open end 47 of the second sub-channel 41.2. The second distribution channel opening can be formed on the protrusion.

[0104] Fig. Figure 3 schematically shows four views (a)-(d) of rotor 1, with each view showing one or more additional components of the previously described rotor 1. Fig. The cooling channel system described in section 2 has been added. In contrast to Fig. 2 is in these views the Fig. 3 the rotor lamination stack 3 of rotor 1 is shown in order to better illustrate various aspects of the present disclosure. It is conceivable that the four views (a)-(d) in the sequence shown may represent individual stages of rotor 1 during its manufacture and thus individual process steps for the manufacture of rotor 1.

[0105] In Fig. Figure 3(a) shows the rotor lamination stack 3, wherein the rotor 1 comprises three plug-in coils 10 which are plugged or joined into the rotor lamination stack 3 and project axially beyond the rotor lamination stack 3. The rotor lamination stack 3 has three cavities 31, the cavities 31 being adjacent to the rotor shaft 2. Fundamentally, the rotor 1 or the rotor lamination stack 3 can also have more or fewer than three plug-in coils 10 (i.e., at least one plug-in coil 10) and more or fewer than three cavities 31 (i.e., at least one cavity 31). As shown, for example, in the views of Fig. Figure 3 shows that a number of plug-in coils 10 correspond to a number of cavities 31, wherein one of the cavities 31 can be arranged in the circumferential direction of the rotor 1 between two of the plug-in coils 10.

[0106] In Fig. 3(b) In each of the cavities 31, a cooling fluid channel body 4 is arranged, wherein the respective cooling fluid channel body 4 is inserted or joined into the cavity 31. Thus, the number of plug-in coils 10 corresponds to a number of cooling fluid channel bodies 4, wherein one of the cooling fluid channel bodies 4 is arranged in the circumferential direction of the rotor 1 between two of the plug-in coils 10.

[0107] During the Fig. The end of the rotor lamination stack 3 facing 3(b) is the first axial end, at which the respective first longitudinal end 43 of the cooling fluid channel bodies 4 is arranged. The open end 42 of the cooling fluid channel 41 and the open end 46 of the first sub-channel 46 are formed at the respective first longitudinal end 43. Thus, the rotor 1 shown comprises three cooling fluid channel bodies 4 and therefore three cooling fluid channels 41, which must be fluidically connected to the passages 22 and thus to the main fluid channel 21.

[0108] To create this fluidic connection, in Fig. 3(c) Additionally, the collecting and distributing body 7 is arranged on the rotor shaft 2. As can be seen, one of the projections 71 of the collecting and distributing body 7 is arranged in the area of ​​one of the passages 22 and one of the open ends 42 (and covers them from the outside), so that each distribution channel of the collecting and distributing body 7 fluidically connects a passage 22 with an open end 42.

[0109] In Fig. 3(d) The rotor 1 additionally comprises three first distribution channel arrangements 5, each arranged on one of the cooling fluid channel bodies 4. Each first distribution channel arrangement 5 is fluidically connected to the first sub-channel 41.1 or the open end 46 of the first sub-channel 41.1 of one of the cooling fluid channel bodies 4.

[0110] Each first distribution channel arrangement 5 has two spaced-apart channel arms 51, 52, which extend radially outwards along the rotor lamination stack 3 and are open in the radial direction. The two channel arms 51, 52 can be configured to run along the end sections of two adjacent plug-in coils 10. The two channel arms 51, 52 can be arranged such that they directly contact the end sections of the plug-in coils 10 (or windings of the plug-in coils 10).

[0111] To describe the two channel arms 51, 52 in more detail, an arrangement of two plug-in coils and a first distribution channel arrangement 5 can be considered, for example. The multiple plug-in coils 10 can thus comprise a first plug-in coil 10 and a second plug-in coil 10, which are arranged adjacent to each other in the circumferential direction of the rotor 1. A cooling fluid channel body 4, and thus a first distribution channel arrangement 5, can be arranged in the circumferential direction of the rotor 1 between the first plug-in coil 10 and the second plug-in coil 10. One of the two channel arms 51 of the first distribution channel arrangement 5 can run along an end section of the first plug-in coil 10. The other of the two channel arms 52 of the first distribution channel arrangement 5 can run along an end section of the second plug-in coil 10.

[0112] The rotor 1 can further comprise second distribution channel arrangements 6, which are attached to the (in the views of the Fig. The second longitudinal ends 44 of the cooling fluid channel bodies 4 can be arranged at the 3 opposite sides. The second distribution channel arrangements 6 can be designed analogously to the first distribution channel arrangements 5.

[0113] Fig. Figure 4 schematically shows four views in which a first or second end disk 8, 9 and a first or second distribution channel arrangement 5, 6 are depicted individually or in a pre-assembled state. The end disk shown in each view can be either the first end disk 8 or the second end disk 9, since the two end disks 8, 9 can be identical. The same applies to the distribution channel arrangements shown, which can be either the first distribution channel arrangement 5 or the second distribution channel arrangement 6.

[0114] As in Fig. As shown in Figure 4(a), the first and second end disks 8 and 9 are designed as ring disks and have a central, circular shaft opening 82 and 92 for receiving the rotor shaft 2. The first and second end disks 8 and 9 also have three rectangular openings 81 and 91 for receiving and / or passing through an end section of one of the plug-in coils 10.

[0115] Furthermore, the first and second end disks 8, 9 have recesses 83, 93 for receiving one of the first and second distribution channel arrangements 5, 6, respectively. The recesses 83, 93 can each be shaped to (optionally completely) receive the two channel arms 51, 52 or 61, 62 and the intermediate arm 53 or 63. Accordingly, the recesses 83, 93 can each be configured to have two sections, each extending along an edge of one of two adjacent openings 81, 91.

[0116] In Fig. Figure 4(b) shows three of the first and second distribution arrangements 5, 6, which, as in the previous figures, each have two channel arms 51, 52 and 61, 62, respectively, and an intermediate arm 53 and 63, respectively. Furthermore, the first and second distribution arrangements 5, 6 each have the first and second distribution channel openings 54 and 64, respectively, which serve for fluidic connection with the first sub-channel 41.1 and the second sub-channel 41.2, respectively. Here, each of the first and second distribution channel openings 54 and 64 is formed on a projection that can be plugged into the open end 46 of the first sub-channel 41.1 and the open end 47 of the second sub-channel 41.2, respectively.

[0117] Fig. Figure 4(c) shows a pre-assembled or mounted state in which the first and second distribution assemblies 5, 6 are mounted in the recesses 83, 93 of the first and second end disks 8, 9, respectively. The first and second distribution assemblies 5, 6 are mounted such that the two channel arms 51, 52 and 61, 62, respectively, extend along edges of two adjacent openings 81, 91 of the first and second end disks 8, 9, respectively, and the first and second distribution channel openings 54, 64 are arranged facing away from the first and second end disks 8, 9, respectively.

[0118] As in Fig. As shown in Figure 4(d), the first and second end disks 8, 9 can further comprise a first and second insulating body 84, 94, respectively. The first and second insulating body 84, 94 can be formed as an annular layer and applied to the side surface of the first and second end disks 8, 9, respectively, in which the recesses 83, 93 are also formed. The first and second insulating body 84, 94 can, for example, be applied such that the first and second distribution arrangements 5, 6, or the two channel arms 51, 52 and 61, 62, respectively, of the first and second distribution arrangements 5, 6 are at least partially covered by the first and second insulating body 84, 94, respectively.

[0119] Fig. Figure 5 shows the rotor 1 with separate end disks 8, 9 ( Fig. 5(a)), e.g. during a manufacturing or assembly step, and the rotor 1 with the mounted end discs 8, 9 ( Fig. 5(b)).

[0120] As in Fig. As shown in Figure 5(a), the first end disk 8 is provided for arrangement or mounting at the first axial end of the rotor lamination stack 3, where the collecting and distributing body 7 is also arranged. Accordingly, it is conceivable that the shaft opening 82 of the first end disk 8 can have a shape or be designed to accommodate the collecting and distributing body 7 in addition to the rotor shaft 2. If the first end disk 8 is the one shown in Figure 5(a), then the first end disk 8 is the one shown in Figure 5(a). Fig. 4(c) or Fig. 4(d) End disk shown, i.e., the first distribution arrangements 5 are pre-mounted on the first end disk 8 or received in the recesses 83, the first end disk 8 is oriented such that the first distribution arrangements 5 face the rotor lamination stack 3 and the cooling fluid channel bodies 4, or are arranged between the first end disk 8 and the rotor lamination stack 3 after assembly. Similarly, the first insulation body 84 of the first end disk 8 also faces the rotor lamination stack 3, so that it is arranged between the first end disk 8 and the rotor lamination stack 3 after assembly.

[0121] The second end plate 9 is designed for arrangement or mounting at the second axial end of the rotor lamination stack 3. Analogous to the first end plate 8, the second end plate 9 is oriented such that the second distribution assemblies 6 face the rotor lamination stack 3 and the cooling fluid channel bodies 4, or, after assembly, are arranged between the second end plate 9 and the rotor lamination stack 3. Similarly, the second insulation body 94 of the second end plate 9 also faces the rotor lamination stack 3, so that after assembly it is arranged between the second end plate 9 and the rotor lamination stack 3.

[0122] Fig. Figure 5(b) shows the rotor 1 in a fully assembled state, including the mounted and arranged end disks 8 and 9. The rotor 1 comprises the first end disk 8, located at the first axial end of the rotor lamination stack 3, and the second end disk 9, located at the second axial end of the rotor lamination stack 3. The first distribution channel arrangement 5 is located between the first end disk 8 and the rotor lamination stack 3, while the second distribution channel arrangement 6 is located between the second end disk 9 and the rotor lamination stack 3.

[0123] Furthermore, it can be seen that the end sections of the cooling fluid channel bodies 4, which project axially beyond the first axial end of the rotor lamination stack 3, are received in or guided through the openings 81 of the first end disk 8. Similarly, the end sections of the cooling fluid channel bodies 4, which project axially beyond the second axial end of the rotor lamination stack 3, can be received in or guided through the openings 91 of the second end disk 9.

[0124] In Fig. Figure 6 schematically depicts the motor vehicle 200, which comprises the electrically excited synchronous machine 100 with the rotor 1. The electrically excited synchronous machine 100 can, for example, serve as the drive machine or traction machine of the motor vehicle 200; that is, the motor vehicle 200 can be an electrically powered motor vehicle or an electric vehicle. Reference symbol list 1 Rotor 2 Rotor shaft 3 Rotor lamination package 4 cooling fluid channel bodies 5 first distribution channel arrangements 6 second distribution channel arrangements 7 Collecting and distributing bodies 8 first end disc 9 second end disc 10 plug-in coils 11 sealing plugs 21 Main cooling fluid channel of the rotor shaft 22 passes of the rotor shaft 23 Surface area of ​​the rotor shaft 31 cavities of the rotor lamination stack 41 Cooling fluid channel of the cooling fluid channel body 41.1 First sub-channel of the cooling fluid channel 41.2 second sub-channel of the cooling fluid channel 41.3 third sub-channel of the cooling fluid channel 41.4 Branching point of the cooling fluid channel 42 open end of the cooling fluid channel 43 first longitudinal end of the cooling fluid channel body 44 second longitudinal end of the cooling fluid channel body 45 middle area of ​​the cooling fluid channel body 46 open end of the first sub-channel (or first open sub-channel end) 47 open end of the second sub-channel (or second open sub-channel end) 51, 52 Channel arms of the first distribution channel arrangement 53 Intermediate arm of the first distribution channel arrangement 54 first distribution channel opening of the first distribution channel arrangement 61, 62 Channel arms of the second distribution channel arrangement 63 Intermediate arm of the second distribution channel arrangement 64 second distribution channel opening of the second distribution channel arrangement 71 Cantilevers of the collecting and distributing body 72 distribution openings of the collecting and distributing body 81 openings of the first ring disc 82 Shaft opening of the first ring disc 83 recesses of the first ring disc 84 first insulating body of the first ring disc 91 openings of the second ring disc 92 Shaft opening of the second ring disc 93 recesses of the second ring disc 94 second insulating body of the first ring disc 100 electrically excited synchronous machines 200 motor vehicles R axial direction of the rotor or rotor shaft QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 2022 / 0399770 A1

[0005] EP 3 687 038 A1

[0006] DE 10 2018 222 469 A1

[0007]

Claims

[1] Rotor (1) for an electrically excited synchronous machine, wherein the rotor (1) comprises: - a rotor shaft (2) having a main cooling fluid channel (21) extending in the axial direction (R) of the rotor (1); and - a rotor lamination stack (3) which circumferentially surrounds the rotor shaft (2) and has a cavity (31), wherein the cavity (31) is formed adjacent to the rotor shaft (2) and extends in the axial direction (R); characterized by , that the rotor (1) comprises: - a cooling fluid channel body (4) which is inserted into the cavity (31) and has a cooling fluid channel (41) wherein the cooling fluid channel (41) has an open end (42) which is fluidically connected to the main cooling fluid channel (21). [2] Rotor (1) according to claim 1, characterized by , that - the cooling fluid channel (41) branches into a first sub-channel (41.1) and a second sub-channel (41.2), wherein - the first partial channel (41.1) extends to a first longitudinal end (43) of the cooling fluid channel body (4), and - the second partial channel (41.2) extends to a second longitudinal end (44) of the cooling fluid channel body (4). [3] Rotor (1) according to claim 2, characterized by , that - the cooling fluid channel (41) extends from the open end (42) to the central region (45) of the cooling fluid channel body (4) in the axial direction (R) and branches out in the central region (45), and / or - the open end (42) of the cooling fluid channel (41) is formed at the first longitudinal end (43) or second longitudinal end (44) of the cooling fluid channel body (4). [4] Rotor (1) according to claim 2 or 3, characterized by , that the rotor (1) comprises: - a first distribution channel arrangement (5) which is arranged outside the rotor lamination stack (3) at the first longitudinal end (43) of the cooling fluid channel body (4) and is fluidically connected to the first sub-channel (41.1) of the cooling fluid channel (41); and / or - a second distribution channel arrangement (6) which is arranged outside the rotor lamination stack (3) at the second longitudinal end (44) of the cooling fluid channel body (4) and is fluidically connected to the second partial channel (41.2) of the cooling fluid channel (41), wherein - the first distribution channel arrangement (5) and / or the second distribution channel arrangement (6) each have two spaced-apart channel arms (51, 52, 61, 62) which extend outwards in the radial direction of the rotor (1) on the rotor lamination stack (3) and are designed to be open in the radial direction outwards. [5] Rotor (1) according to claim 4, characterized by , that the rotor (1) comprises: - several plug-in coils (10) which are inserted into the rotor lamination stack (3) and project axially beyond the rotor lamination stack (3), wherein the several plug-in coils (10) comprise a first plug-in coil (10) and a second plug-in coil (10) which are arranged adjacent to each other in the circumferential direction of the rotor (1), wherein - the cooling fluid channel body (4) is arranged in the circumferential direction of the rotor (1) between the first plug-in coil (10) and the second plug-in coil (10), - one of the two channel arms (51, 61) of the first distribution channel arrangement (5) and / or the second distribution channel arrangement (6) runs along an end section of the first plug-in coil (10), optionally such that one of the two channel arms (51, 61) directly touches the end section of the first plug-in coil (10), and - another of the two channel arms (52, 62) of the first distribution channel arrangement (5) and / or the second distribution channel arrangement (6) runs along an end section of the second plug-in coil (10), optionally such that the other of the two channel arms (52, 62) directly touches the end section of the second plug-in coil (10). [6] Rotor (1) according to claim 4 or 5, characterized by , that the rotor (1) comprises: - a first end disk (8) arranged at a first axial end of the rotor lamination stack (3), wherein the first distribution channel arrangement (5) is arranged between the first end disk (8) and the rotor lamination stack (3); and / or - a second end disk (9) arranged at a second axial end of the rotor lamination stack (3), wherein the second distribution channel arrangement (6) is arranged between the second end disk (9) and the rotor lamination stack (3). [7] Rotor (1) according to claim 6, characterized by , that - the first end disk (8) has a first insulating body (84) arranged between the first end disk (8) and the rotor lamination stack (3), optionally wherein the first insulating body (84) extends between the first end disk (8) and several plug-in coils (10) of the rotor (1) and / or at least sectionally around the first distribution channel arrangement (5), and / or - the second end disk (9) has a second insulating body (94) arranged between the second end disk (9) and the rotor lamination stack (3), optionally wherein the second insulating body (94) extends between the second end disk (9) and several plug-in coils (10) of the rotor (1) and / or at least sectionally around the second distribution channel arrangement (6). [8] Rotor (1) according to any one of claims 1 to 7, characterized by , that - the rotor shaft (2) has at least one passage (22) formed on a lateral surface (23) of the rotor shaft (2) and extending to the main cooling fluid channel (21), and - the rotor (1) comprises: - a collecting and distributing body (7) configured to fluidically connect the at least one passage (22) of the rotor shaft (2) and the open end (42) of the cooling fluid channel (41), wherein the collecting and distributing body (7) is arranged at least sectionally outside the rotor lamination stack (3) on the rotor shaft (2). [9] Rotor (1) according to any one of claims 1 to 8, characterized by , that the rotor (1) comprises: - several plug-in coils (10) that are plugged into the rotor lamination stack (3); and - several of the cooling fluid channel bodies (4), wherein a number of plug-in coils (10) corresponds to a number of the cooling fluid channel bodies (4) and each of the cooling fluid channel bodies (4) is arranged in the circumferential direction of the rotor (1) between two of the plug-in coils (10). [10] Electrically excited synchronous machine (100) for a motor vehicle, characterized by , that the electrically excited synchronous machine (100) comprises the rotor (1) according to one of claims 1 to 9. [11] Motor vehicle (200), characterized by , that the motor vehicle (200) comprises the electrically excited synchronous machine (100) according to claim 10.

Images