Rotor of electric machine

Abstract

The invention relates to a rotor of an electric machine, in particular of a permanent magnet-excited synchronous machine, comprising a rotor shaft (3) which can be rotated about a rotor axis (2), and a rotor body (4) which is arranged on the rotor shaft (3) and which is designed in particular as a rotor lamination stack comprising a plurality of laminations (5), a shaft cooling channel (13) extending in the rotor shaft (3), and a shaft cooling channel (14) extending in the rotor shaft (3). The rotor body (4) has a plurality of rotor poles (6) each having a pole center (7), at least one V-shaped, C-shaped or arcuate magnet pocket (10) having a plurality of magnets (9), in particular permanent magnets, is arranged in each of a plurality of the rotor poles, the respective magnet pocket (10) has a magnet-free central region (11) between the two magnets (9) and two magnet-free edge regions (12) on a narrow side (9s) of the magnets (9) facing away from the central region (11), characterized in that at least one pocket cooling channel (15) is formed in the respective magnet pocket (10), the bag cooling channel is in flow connection with the shaft cooling channel (13) and is provided for cooling at least one magnet (9) of the magnet bag (10).

Description

Technical Field

[0001] The invention relates to a rotor for an electric machine of the type according to the independent claim. Background Art

[0002] WO21225902A1 discloses a rotor for an electric motor, the rotor comprising a rotor shaft rotatable about a rotor axis and a rotor body arranged on the rotor shaft, the rotor body being in particular constructed as a rotor lamination stack comprising a plurality of laminations, wherein a shaft cooling channel extends in the rotor shaft, and wherein the rotor body comprises a plurality of rotor poles, each with a pole center, wherein at least one V-shaped, C-shaped or bow-shaped magnet pocket is respectively arranged in each of the plurality of rotor poles of the rotor poles, the magnet pocket comprising a plurality of magnets, wherein the respective magnet pocket comprises a central region without magnets between two magnets and two edge regions without magnets on a narrow side of the magnet facing away from the central region.

[0003] The rotor is cooled by air which is guided through axial channels in the rotor. Summary of the invention

[0004] Advantages of the present invention.

[0005] In contrast, the rotor of the electric machine according to the invention having the characterizing features of the independent claim has the advantage that the cooling of the rotor is improved by providing direct oil cooling of the magnets in the rotor. This is achieved according to the invention by providing at least one bag cooling channel in the respective magnet pocket, which is flow-connected to the shaft cooling channel and is provided for cooling at least one magnet of the magnet pocket.

[0006] Advantageous developments and improvements of the rotor of the electric machine specified in the independent claim make it possible to achieve the measures listed in the dependent claims.

[0007] The respective pocket cooling channel can be formed according to the first and second embodiments in the central region of the respective magnet pocket or in one of the edge regions of the respective magnet pocket or according to the third embodiment in a recess of one of the magnets or between two recesses of two magnets.

[0008] According to an advantageous first embodiment, the respective magnet pockets can be filled with a hardenable filler, in particular a casting compound or a molding material, for fastening the magnets, wherein the respective pocket cooling channel is a cavity which is formed in the filler or at the edge of the filler or is defined outside the filler directly by the wall of the respective magnet pocket. In this way, less filler is required. In addition, the filler can be used to fasten the magnets and to embed or construct the respective pocket cooling channel. The respective pocket cooling channel is also formed directly at or near one of the narrow sides of the respective magnet, thereby further improving the cooling of the magnet.

[0009] According to a first exemplary embodiment of a first embodiment, the respective bag cooling channel can be formed by subsequent demolding from the respective magnet bag, in particular from the filling of the respective magnet bag, by means of a demolding tool, in particular a conical demolding tool. In this way, the respective bag cooling channel is formed in the filling of the respective magnet bag or at the edge of the filling without the need for additional components.

[0010] According to a second embodiment of the first embodiment, the corresponding bag cooling channels can be formed by separate cooling tubes embedded in the filler. In this way, particularly very long and thin cooling channels can be created, which would otherwise not be possible at a delicate tool.

[0011] According to a third embodiment of the first embodiment, the respective bag cooling channel can be formed between one of the narrow sides of the respective magnet and a tube half shell resting against the narrow side of the magnet and embedded in the filler. In this way, the bag cooling channel is formed directly at the magnet, thereby achieving very good cooling of the magnet.

[0012] Advantageously, the two tube half shells are arranged at opposite narrow sides of the respective magnet, wherein the magnet and the two tube half shells are surrounded by a jacket to form a magnet unit. In this way, the two bag cooling channels are formed directly at the two narrow sides of the respective magnet, thereby further improving the cooling of the magnet and achieving the cooling uniformly from both narrow sides.

[0013] According to a fourth exemplary embodiment of the first embodiment, the respective pocket cooling channel is formed by a cavity in the central region of the respective magnet pocket, wherein the cavity is directly bounded by the wall of the respective magnet pocket. The central region of the respective magnet pocket is designed without bridging webs. The pocket cooling channel formed in this way must also be sealed relative to the rotor lamination stack.

[0014] According to a fifth exemplary embodiment of the first embodiment, the respective pocket cooling channel is formed by a cavity in the central region of the respective magnet pocket, wherein the cavity is implemented in a filler arranged in the central region. The pocket cooling channel formed in this way is surrounded by the filler and is thus sealed relative to the rotor lamination stack.

[0015] According to a first embodiment, the central area of ​​the corresponding magnet pocket can be constructed with a bridge or without a bridge. If a bridge is present, the corresponding V-shaped, C-shaped or arched magnet pocket is formed by two magnet pockets, which are separated from each other by the bridge and together form a V-shaped magnet layer.

[0016] If there are bridges, the pocket cooling channels formed in the central region are arranged laterally to the bridges. If there are no bridges, the pocket cooling channels formed in the central region without bridges can be arranged very centrally. The central region without bridges significantly reduces the magnetic flux leakage in the rotor and enables a very large cooling channel with a lower pressure drop than a cooling channel divided into two parts by bridges.

[0017] According to a second embodiment, it is advantageously provided that the central region of the respective magnet pocket is designed without a bridge, and the pocket cooling channel formed in the central region is formed by a hollow central region, and the pocket cooling channel formed in the edge region is formed by a hollow edge region. In this way, the pocket cooling channel can be formed without a hardenable filler, thereby reducing the production costs. In addition, since hardenable fillers generally have a relatively low heat conductivity, the thermal resistance is reduced.

[0018] It is particularly advantageous if a non-magnetic rod-shaped bag body, in particular made of plastic or elastomer, is arranged in the hollow central region and / or in the hollow edge region of the respective magnet pocket, in order to narrow the cross section of the bag cooling channel formed in the central region or in the edge region. In this way, high flow velocities, in particular for achieving turbulent flows, can be achieved in the respective bag cooling channel and thus better cooling of the magnets of the rotor can be achieved. Furthermore, no leakage flux can flow through the non-magnetic bag body.

[0019] According to an advantageous embodiment, the respective pocket can be designed as a round bar or angle bar, in particular made of solid material, and in particular made of plastic or elastomer. The respective pocket is designed in such a way that it rests against the respective outer pole segment and the respective inner pole segment in the respective magnet pocket, in particular clamped between the two pole segments.

[0020] It is also advantageous if the rotor body is surrounded by a rotor sleeve, in particular a fiber composite sleeve, in particular for prestressing the outermost segments of the rotor body against the magnets of the corresponding magnet pockets. In this way, in the second embodiment, the outermost segments are tensioned against one of the innermost segments by the magnets and by the pockets. For this purpose, the corresponding pockets have, for example, a lower rigidity than the magnets. This ensures that the magnets of the corresponding magnet pockets are clamped and thus fixed.

[0021] It is also advantageous if the rotor sleeve extends beyond the rotor body in the axial direction in order to annularly surround two cover disks arranged at the end of the rotor in each case in the joining region. The respective cover disk is then flush with the outer diameter of the rotor body and the joining region of the cover disk is covered by the rotor sleeve, so that the cover disk and thus the cooling circuit in the rotor are sealed off from the outside.

[0022] It is also advantageous that each bag cooling channel has a bag channel inlet and a bag channel outlet, the bag channel inlet is used to supply cooling fluid from the shaft cooling channel, and the bag channel outlet is used to lead away the cooling fluid, wherein the bag channel inlet of the first group of bag cooling channels is constructed at one of the two end sides, and the bag channel inlet of the second group of bag cooling channels is constructed at the other end side of the rotor, so as to generate the oppositely arranged through-flow of the bag cooling channels in the two groups of bag cooling channels. According to the first grouping variant, the bag cooling channels of the first group can be arranged in the rotor poles of the first group, and the bag cooling channels of the second group can be arranged in the rotor poles of the second group. According to the alternative second grouping variant, the bag cooling channels of the first group can be formed by the bag cooling channels located in the central area, and the bag cooling channels of the second group are formed by the bag cooling channels located in the edge area. In this way, the bag cooling channels are flowed through in oppositely arranged directions during the operation of the rotor. The first group and the second group, for example, include the same number of bag cooling channels or include the same flow cross-section in total. This results in uniform cooling of the rotor, particularly when viewed in the axial direction.

[0023] The rotor body has a cover disk at each of the two end sides. A first connecting channel is configured in the first cover disk, which leads to the bag channel inlet of the bag cooling channel of the first group, and a second connecting channel is configured in the second cover disk, which leads to the bag channel inlet of the bag cooling channel of the second group.

[0024] According to a first connection variant, the first connecting channel and the second connecting channel of the two cover disks are each flow-connected to the shaft cooling channel. In this way, a parallel connection of all pocket cooling channels of the rotor is achieved.

[0025] According to a second connection variant, the first connecting channel is flow-connected to the shaft cooling channel, and the second connecting channel is flow-connected to the bag channel outlets of the bag cooling channels of the first group. In particular, the second connecting channel is flow-connected to at least one of the bag channel outlets of the bag cooling channels of the first group. According to an alternative second grouping variant, the second connecting channel can connect the bag cooling channels, which are respectively located in the same rotor pole, to each other. In this way, a series connection of the bag cooling channels of the first group and the bag cooling channels of the second group is achieved.

[0026] It is also advantageous if the pocket channel outlet is flow-connected to a drain channel in each of the two cover disks, wherein the drain channels of the cover disks each have a drain opening for cooling one of the stator winding heads, wherein the drain opening is located in particular at the end face or at the periphery of the respective cover disk or in a return flow section of the shaft cooling channel. In this way, a cooling circuit is formed.

[0027] It is also advantageous if each collecting channel is flow-connected to a plurality of bag channel outlets, in particular of a rotor pole, whose bag cooling channels have different radial positions, wherein the collecting channels of the covering disk each extend radially inwards with respect to the rotor axis starting from the respective bag channel outlet toward the outlet opening. In this way, a uniform flow through the bag cooling channels, which are connected to the same collecting channel, is achieved due to the static pressure recovery.

[0028] The invention further relates to an electric machine having a rotor according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Exemplary embodiments of the invention are shown in simplified form in the drawings and are explained in more detail in the following description.

[0030] in:

[0031] Figure 1 shows a rotor of an electric machine with a parallel connection of bag cooling channels according to the invention,

[0032] Figure 2 Along Figure 1 The line II-II in FIG. 1 shows the Figure 1 A cross-sectional view of the rotor,

[0033] Figure 3 The first example according to the first embodiment shows that Figure 1 One of the rotor poles of the rotor,

[0034] Figure 4 The second example according to the first embodiment shows that Figure 1 One of the rotor poles of the rotor,

[0035] Figure 5 The third example according to the first embodiment shows Figure 1 One of the rotor poles of the rotor,

[0036] Figure 6 The first example according to the second embodiment shows that Figure 1 One of the rotor poles of the rotor,

[0037] Figure 7 According to the third embodiment, Figure 1One of the rotor poles of the rotor,

[0038] Figure 8 shows a rotor of an electric machine with a series connection of bag cooling channels according to the invention,

[0039] Fig. 9 According to Figure 6 The first example of the second embodiment shows the Figure 2 A partial view of a section through the cover disk of the rotor along the line IX-IX in FIG.

[0040] Fig.10 The second example according to the second embodiment shows that Figure 1 One of the rotor poles of the rotor,

[0041] Fig.11 Shown according to Fig.10 A cross-sectional view of the rotor,

[0042] Fig.12 The fourth example according to the first embodiment shows Figure 1 one of the rotor poles of the rotor, and

[0043] Fig.13 The fifth example according to the first embodiment shows Figure 1 One of the rotor poles of the rotor. DETAILED DESCRIPTION

[0044] Figure 1 The rotor of an electric machine is shown with a parallel connection of bag cooling channels according to the invention.

[0045] A rotor 1 of an electric machine, in particular a permanently excited synchronous machine, comprises a rotor shaft 3 rotatable about a rotor axis 2 and a rotor body 4 arranged on the rotor shaft 3. The rotor body 4 is designed, for example, as a rotor laminated core comprising a plurality of laminated plates 5.

[0046] A shaft cooling channel 13 runs in the rotor shaft 3. The rotor body 4 has a plurality of rotor poles 6, each with a pole center 7.

[0047] In a plurality of the rotor poles 6 , for example in each rotor pole 6 , at least one V-shaped, C-shaped or segment-shaped magnet pocket 10 is provided for receiving a plurality of magnets 9 , in particular permanent magnets.

[0048] A magnet layer 8 having a plurality of magnets 9 is formed in the corresponding magnet pocket 10. The magnet layer 8 comprises, for example, Figure 1For example, two magnets 9 are arranged in a V shape. The magnet layer 8 is arranged symmetrically with respect to the corresponding pole center 7, for example. The corresponding rotor pole 6 is divided into an inner pole segment 6i and an outer pole segment 6a in the radial direction with respect to the rotor axis 2 by the corresponding magnet layer 8. The corresponding magnet pocket 10 can also be a magnet layer 8 comprising two magnet pockets, which are separated from each other by a bridge.

[0049] The respective magnet pocket 10 has a magnet-free central region 11 between two magnets 9 and two magnet-free edge regions 12 on the narrow side 9s of the magnet 9 facing away from the central region 11. The central region 11 is formed in the region of the pole center 7 and extends in the circumferential direction between the two narrow sides 9s of the two magnets 9 of the magnet pocket 10 facing the pole center 7. The magnet layer 8 comprises two arms arranged at an angle, wherein the edge region 12 is arranged at the ends of the arms of the magnet layer 8 facing away from each other, in particular at or near the narrow side 9s facing away from the central region 11. The respective edge regions 12 of the respective magnet pockets 10 can be implemented with bridges or without bridges toward the outer periphery of the rotor body 4.

[0050] Figure 2 Along Figure 1 The line II-II in FIG. 1 shows the Figure 1 A cross-sectional view of the rotor.

[0051] According to the invention, at least one bag cooling channel 15 is formed in the respective magnet pocket 10, which bag cooling channel is fluidically connected to the shaft cooling channel 13 and is provided for cooling at least one magnet 9 of the magnet pocket 10. For example, a plurality of bag cooling channels 15 can also be implemented in the respective magnet pocket 10.

[0052] According to the first and second embodiments, the corresponding bag cooling channel 15 can be constructed in the central region 11 of the corresponding magnet bag 10 or in one of the edge regions 12 of the corresponding magnet bag 10. According to the first and second embodiments, the central region 11 of the corresponding magnet bag 10 can have a bridge 22 for connecting the outer pole segment 6a and the inner pole segment 6i or can be constructed without a bridge.

[0053] Each bag cooling channel 15 has a bag channel inlet 15e for supplying cooling fluid from the shaft cooling channel 13 and a bag channel outlet 15a for conducting away the cooling fluid. Here, the bag channel inlet 15e of the bag cooling channels 15 of the first group 14.1 can be constructed at one of the two end sides, and the bag channel inlet 15e of the bag cooling channels 15 of the second group 14.2 can be constructed at the other end side of the rotor 1, so as to produce oppositely arranged through-flows of the bag cooling channels 15 in the two groups 14.1 and 14.2. According to a first grouping variant, the bag cooling channels 15 of the first group 14.1 can be arranged in particular in the rotor poles 6 of the first group, and the bag cooling channels 15 of the second group 14.2 can be arranged in particular in the rotor poles 6 of the second group. The bag cooling channels 15 of the first group 14.1 are formed, for example, by each bag cooling channel 15 looking at the second rotor pole 6 in the circumferential direction. The pocket cooling channels 15 of the second group 14 . 2 are formed, for example, by the pocket cooling channels 15 of each of the remaining second rotor poles 6 as seen in the circumferential direction.

[0054] In all embodiments, the rotor body 4 has a cover disc 25 at both end sides, wherein a first connecting channel 26.1 is configured in the first cover disc 25.1, which leads to the bag channel inlet 15e of the bag cooling channel 15 of the first group 14.1, and a second connecting channel 26.2 is configured in the second cover disc 25.2, which leads to the bag channel inlet 15e of the bag cooling channel 15 of the second group 14.2. The first and second connecting channels 26.1, 26.2 of the two cover discs 25 are flow-connected to the shaft cooling channel 13, thereby realizing a parallel circuit of all bag cooling channels 15. Each connecting channel 26.1 can lead to a plurality of bag channel inlets 15e respectively and thus act as a distribution channel. The cover discs 25.1, 25.2 are implemented flush with the rotor body 4 in the radial direction with respect to the rotor axis 2, for example.

[0055] Figure 3 The first example according to the first embodiment shows that Figure 1 One of the rotor poles of the rotor.

[0056] According to a first embodiment, the respective magnet pocket 10 is filled with a hardenable filler 17, in particular a potting compound or a molding material, for fastening the magnets 9, wherein the respective pocket cooling channel 15 is a cavity which is embedded in the filler 17 or is formed between the edge of the respective magnet pocket 10 and the edge of the filler 17. Figure 3 In the first exemplary embodiment of the first embodiment, the respective bag cooling channel 15 is formed by subsequent demolding or extraction from the respective magnet bag 10 , in particular from the filling 17 of the respective magnet bag 10 , using, for example, a conical demolding tool. Figure 3 For example, two bag cooling channels 15 are implemented in the central region 11, and a bag cooling channel 15 is implemented in each of the two edge regions 12. Instead of two bag cooling channels 15 in the central region 11, only one bag cooling channel 15 can also be formed in the central region 11. Of course, less than four bag cooling channels 15 can also be provided in the corresponding magnet pocket 10, for example only in the central region 11 or only in the edge region 12.

[0057] Figure 4 The second example according to the first embodiment shows that Figure 1 One of the rotor poles of the rotor.

[0058] According to a second exemplary embodiment of the first embodiment, the respective bag cooling channels 15 are formed by separate cooling pipes 18 embedded in the filler 17. Figure 4 , for example, a cooling tube 18 is implemented in the central area 11, and a cooling tube 18 is also implemented in each of the two edge areas 12. Of course, less than three bag cooling channels 15 can also be provided in the corresponding magnet bag 10, for example only in the central area 11 or only in the edge area 12.

[0059] Figure 5 The third example according to the first embodiment shows Figure 1 One of the rotor poles of the rotor.

[0060] According to a third example of the first embodiment, the respective bag cooling channel 15 is formed between one of the narrow sides 9s of the respective magnet 9 and a tube half-shell 19 resting against the narrow side 9s of the magnet 9 and embedded in the filler 17. A “tube half-shell 19” can also be understood as a tube shell that comprises slightly more or less than half the cross section of the tube.

[0061] According to the third exemplary embodiment, two tube half shells 19 are arranged on two opposite narrow sides 9s of the respective magnet 9 , wherein the magnet 9 and the two tube half shells 19 are surrounded by a jacket 20 in order to form a magnet unit.

[0062] Figure 6 The first example according to the second embodiment shows that Figure 1 One of the rotor poles of the rotor.

[0063] According to a first example of the second embodiment, the central region 11 of the respective magnet pocket 10 is respectively constructed without a web, wherein the pocket cooling channel 15 formed in the central region 11 is formed by the hollow central region 11 and the pocket cooling channel 15 formed in the edge region 12 is formed by the hollow edge region 12. Here, the hollow central region 11 is delimited in the circumferential direction by the narrow sides 9s of the two magnets 9 facing the pole center 7 and in the radial direction with respect to the rotor axis 2 by the magnet pocket 10. The hollow edge region 12 is delimited by the narrow sides 9s of the respective magnet 9 facing away from the central region 11 and by the side of the magnet pocket 10 in the region of the arm ends.

[0064] In the hollow central region 11 and / or in the hollow edge region 12 of the respective magnet pocket 10, a non-magnetic rod-shaped pocket body 23, in particular made of plastic or elastomer, can be arranged in each case for narrowing the cross section of the pocket cooling channel 15 formed in the central region 11 or in the edge region 12. The pocket cooling channel 15 is formed between the pocket body 23 and the narrow side 9s of the respective magnet 9 in this case. However, it is also possible to explicitly omit the pocket body 23 according to Figure 6 The bag body 23.

[0065] according to Figure 6 , for example, a pocket 23 is implemented in the central area 11, and a pocket 23 is implemented in each of the two edge areas 12. It goes without saying that less than three pockets 23 can also be provided in the corresponding magnet pocket 10, for example, only pockets 23 located in the central area 11. The pockets 23 located in the central area 11 are arranged symmetrically to the pole center 7, for example.

[0066] According to the second embodiment, the rotor body 4 is surrounded by a rotor sleeve 24 , in particular a fiber composite sleeve, which is produced or equipped for prestressing the outer pole segments 6 a against the magnets 9 of the magnet layer 8 with a prestressing force.

[0067] The respective pocket 23 in the respective magnet pocket 10 rests against the respective outer pole segment 6 a and the respective inner pole segment 6 i and is clamped, for example, between the two pole segments 6 a , 6 i by means of a preloaded rotor sleeve 24 .

[0068] A potting compound (not shown), in particular epoxy resin, can be provided on each of the broad sides of the magnet 9 for fixing the magnet or for sealing.

[0069] Figure 7 According to the third embodiment, Figure 1 One of the rotor poles of the rotor.

[0070] According to a third embodiment, the respective pocket cooling channel 15 is formed in a recess 16 of one of the magnets 9 or between two recesses 16 of two magnets 9 .

[0071] Figure 8 The rotor of an electric machine is shown with an alternative series connection of the bag cooling channels according to the invention.

[0072] As a basis Figure 1 In all embodiments 8, the first connecting channel 16.1 of the first cover disk 25.1 can be flow-connected to the shaft cooling channel 13, and the second connecting channel 16.2 of the second cover disk 25.2 is flow-connected to the bag channel outlet 15a of the bag cooling channel 15 of the first group 14.1, thereby realizing a series connection of the bag cooling channels 15 of the first group 14.1 and the bag cooling channels 15 of the second group 14.2. In particular, the second connecting channel 16.2 is flow-connected to one of the bag channel outlets 15a of the bag cooling channels 15 of the first group 14.1. According to the alternative second grouping variant, the second connecting channel 16.2 can connect the bag cooling channels 15 respectively located in the same rotor pole 6 to each other.

[0073] Fig. 9 According to Figure 6 The first example of the second embodiment shows the Figure 2 A partial view of a section through the cover disk of the rotor, with line IX-IX in FIG.

[0074] In all embodiments, each bag channel outlet 15a is flow-connected to a collecting channel 27 in one of the two cover disks 25.1, 25.2, wherein the collecting channels 27 of the cover disks 25.1, 25.2 each have an outlet opening 28, which can be located at the end face or at the periphery of the respective cover disk 25.1, 25.2 or open into the return flow section of the shaft cooling channel 13. A plurality of collecting channels 27 can be formed in each of the cover disks 25.1, 25.2.

[0075] Each collecting channel 27 can be flow-connected to a plurality of bag channel outlets 15 a, in particular of a rotor pole 6, whose bag cooling channels 15 have different radial positions with respect to the rotor axis 2, wherein the collecting channels 27 of the covering disks 25.1, 25.2 extend radially inwards with respect to the rotor axis 2 starting from the respective bag channel outlet 15 a towards the outlet opening 28.

[0076] Fig.10 The second example according to the second embodiment shows that Figure 1 One of the rotor poles of the rotor.

[0077] according to Fig.10 The second embodiment of the second embodiment of the present invention is Figure 6The first exemplary embodiment differs only in that two magnet layers 8 are provided with pockets 23 according to the invention.

[0078] Fig.11 Shown according to Fig.10 A cross-sectional view of the rotor.

[0079] The rotor sleeve 24 can extend in the axial direction relative to the rotor axis 2 beyond the rotor body 4 in order to annularly surround two end-arranged cover disks 25.1, 25.2 of the rotor 1 in each joining region 24.1. For example, a joining connection is provided between the respective joining region 24.1 of the rotor sleeve 24 and the respective cover disk 25.1, 25.2, which can be designed in particular to be liquid-tight.

[0080] exist Fig.11 1 , 25 . 2 also extend radially inwards with respect to the rotor axis 2 , starting from the respective bag channel outlet 15 a towards the outlet opening 28 .

[0081] Fig.12 The fourth example according to the first embodiment shows Figure 1 One of the rotor poles of the rotor.

[0082] According to a fourth example of the first embodiment, the central region 11 of the corresponding magnet pocket 10 is constructed without a bridge. The individual bag cooling channels 15 are formed in the central region 11 by a hollow central region 11 outside the filler 17, in that the magnet pocket 10 is filled with the filler 17 through a pouring port outside the central region 11, for example in at least one edge region of the edge region 12, and the central region 11 remains completely free of the filler 17, for example by means of a demoulding tool that can be removed later or by pressure-free filling with the filler. The central region 11 of the magnet pocket 10 is implemented, for example, in a triangular or trapezoidal shape. The narrow side 9s of the corresponding magnet 9 facing the central region 11 is kept free of the filler 17, for example, by a seal at the rotor body 4 or at the demoulding tool. The corresponding magnet pocket 10 can have a recess on the inner side facing the wide side of the corresponding magnet 9, which is provided for improving the exhaust when the filler 17 is injected and is particularly close to the positioning projection for positioning the magnet 9.

[0083] Fig.13 The fifth example according to the first embodiment shows Figure 1 One of the rotor poles of the rotor.

[0084] According to a fifth example of the first embodiment, the central region 11 of the respective magnet pocket 10 is designed without a bridge. A single bag cooling channel 15 is formed in the central region 11 of the respective magnet pocket 10 in that the magnet pocket 10 is filled with a filler 17 through a pouring opening outside the central region 11, for example in at least one edge region of the edge regions 12, and the central region 11 is kept free of the filler 17 in a partial cross section that is smaller than the cross section of the central region 11 by means of a demoulding tool that can be removed later. The bag cooling channel 15 thus formed is thus surrounded by the filler 17 and sealed by the filler 17. The central region 11 of the magnet pocket 10 is designed, for example, in a triangular or trapezoidal shape.

Claims

1. A rotor of an electric machine, in particular a permanently excited synchronous machine, comprising a rotor shaft (3) rotatable about a rotor axis (2) and a rotor body (4) arranged on the rotor shaft (3), the rotor body being in particular designed as a rotor lamination stack comprising a plurality of laminations (5), wherein: A shaft cooling channel (13) extends in the rotor shaft (3), wherein the rotor body (4) has a plurality of rotor poles (6) each with a pole center (7), wherein at least one V-shaped, C-shaped or arcuate magnet pocket (10) is arranged in each of the plurality of rotor poles (6), the magnet pocket having a plurality of magnets (9), in particular permanent magnets, wherein the respective magnet pocket (10) has a magnet-free central region (11) between two magnets (9) and two magnet-free edge regions (12) on the narrow side (9s) of the magnet (9) facing away from the central region (11), It is characterized in that At least one bag cooling channel (15) is formed in the respective magnet pocket (10), which bag cooling channel is fluidically connected to the shaft cooling channel (13) and is provided for cooling at least one magnet (9) of the magnet pocket (10).

2. The rotor according to claim 1, characterized in that Corresponding bag cooling channels (15) a. constructed in the central region (11) of the corresponding magnet pocket (10) or in one of the edge regions (12) of the corresponding magnet pocket (10), or b. is formed in a recess (16) of one of the magnets (9) or between two recesses (16) of two magnets (9).

3. The rotor according to any one of claims 1 or 2, characterized in that: The respective magnet bag (10) is filled with a hardenable filler (17), in particular a casting compound or a molding material, for fastening the magnet (9), wherein the respective bag cooling channel (15) is a cavity which is formed in the filler (17) or at the edge of the filler (17), or is directly defined by the wall of the respective magnet bag (10) outside the filler (17).

4. The rotor according to claim 3, characterized in that The respective pocket cooling channel (15) is formed by subsequent demolding of the respective magnet pocket (10), in particular from a filling (17) of the respective magnet pocket (10), by means of a demolding tool, in particular a conical demolding tool.

5. The rotor according to claim 3, characterized in that The respective bag cooling channels (15) are formed by separate cooling tubes (18) embedded in the filler (17).

6. The rotor according to claim 3, characterized in that The respective bag cooling channel (15) is formed between one of the narrow sides (9s) of the respective magnet (9) and a tube half-shell (19) abutting against the narrow side (9s) of the magnet (9) and embedded in the filler (17).

7. The rotor according to claim 6, characterized in that Two tube half shells (19) are arranged on opposite narrow sides (9s) of the respective magnet (9), wherein the magnet (9) and the two tube half shells (19) are surrounded by a jacket (20) in order to form a magnet unit.

8. The rotor according to any one of claims 2 or 3, characterized in that The central region (11) of the respective magnet pocket (10) has webs (22) or is designed without webs.

9. The rotor according to claim 8, characterized in that The central region (11) of the respective magnet pocket (10) is respectively constructed without webs, wherein the pocket cooling channel (15) formed in the central region (11) is formed by a hollow central region (11), and the pocket cooling channel (15) formed in the edge region (12) is formed by a hollow edge region (12).

10. The rotor according to claim 9, characterized in that A non-magnetic rod-shaped bag body (23), in particular made of plastic or elastomer, is arranged in the hollow central area (11) and / or in the hollow edge area (12) of the corresponding magnet bag (10) for narrowing the cross section of the bag cooling channel (15) formed in the central area (11) or in the edge area (12).

11. A rotor according to any one of the preceding claims, characterised in that The rotor body (4) is surrounded by a rotor sleeve (24), in particular a fiber composite sleeve, in particular for prestressing an outer pole section (6a) of the rotor body (4) against a magnet (9) of the corresponding magnet pocket (10).

12. The rotor according to claim 11, characterized in that The rotor sleeve (24) extends in the axial direction beyond the rotor body (4) in order to annularly surround two end-arranged cover disks (25.1, 25.2) of the rotor (1) in respective joining regions (24.1), wherein a joining connection is in particular provided between the respective joining regions (24.1) of the rotor sleeve (24) and the respective cover disks (25.1, 25.2).

13. A rotor according to any one of the preceding claims, characterised in that Each bag cooling channel (15) has a bag channel inlet (15e) for supplying cooling fluid from the shaft cooling channel (13) and a bag channel outlet (15a) for conducting away the cooling fluid, wherein: a. The bag channel inlet (15e) of the bag cooling channel (15) of the first group (14.1) is configured at one of the two end sides, and b. the bag channel inlet (15e) of the bag cooling channels (15) of the second group (14.2) is configured at the other end side of the rotor (1) to produce oppositely arranged throughflows of the bag cooling channels (15) of the two groups (14.1, 14.2), wherein the bag cooling channels (15) of the first group (14.1) are particularly arranged in the rotor poles (6) of the first group, and the bag cooling channels (15) of the second group (14.2) are particularly arranged in the rotor poles (6) of the second group, or wherein the bag cooling channels (15) of the first group (14.1) are formed by bag cooling channels (15) located in the central area (11), and the bag cooling channels (15) of the second group (14.2) are formed by bag cooling channels (15) located in the edge area (12).

14. The rotor according to claim 13, characterized in that The rotor body (4) has a cover disk (25.1, 25.2) at both end sides, wherein a first connecting channel (26.1) is formed in the first cover disk (25.1), the first connecting channel leading to the bag channel inlet (15e) of the bag cooling channel (15) of the first group (14.1), and a second connecting channel (26.2) is formed in the second cover disk (25.2), the second connecting channel leading to the bag channel inlet (15e) of the bag cooling channel (15) of the second group (14.2), wherein a. The first connecting channel and the second connecting channel (26.1, 26.2) of the two cover disks (25.1, 25.2) are flow-connected to the shaft cooling channel (13), or b. The first connecting channel (26.1) is flow-connected to the shaft cooling channel (13), and the second connecting channel (26.2) is flow-connected to the bag channel outlet (15a) of the bag cooling channel (15) of the first group (14.1).

15. A rotor according to any one of claims 13 or 14, characterized in that Each bag channel outlet (15a) is flow-connected to a collecting channel (27) in one of the two covering disks (25.1, 25.2), wherein the collecting channels (27) of the covering disks (25.1, 25.2) each have an outlet opening (28), which is located in particular at the end side or at the periphery of the respective covering disk (25.1, 25.2) or opens into a return flow section of the shaft cooling channel (13).

16. The rotor according to claim 15, characterized in that Each collecting channel (27) is flow-connected to a plurality of bag channel outlets (15a), in particular of a rotor pole (6), whose bag cooling channels (15) have different radial positions with respect to the rotor axis (2), wherein the collecting channels (27) of the cover disks (25.1, 25.2) extend radially inwards with respect to the rotor axis (2) starting from the respective bag channel outlets (15a) toward the outlet openings (28).

17. An electric machine having a rotor (81) according to any one of the preceding claims.

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