Rotor of an electric machine

Abstract

The invention relates to a rotor of an electric machine, in particular a permanent magnet synchronous motor, comprising a rotor shaft (3) that can rotate about a rotor axis (2) and a rotor body (4) arranged on the rotor shaft (3) and, in particular, in the form of a rotor lamination stack with a plurality of laminations (5), wherein a shaft-cooling channel (13) runs in the rotor shaft (3) and wherein the rotor body (4) has multiple rotor poles (6) with a respective pole centre (7), wherein a respective at least one V-shaped, C-shaped or arched magnet pocket (10) with multiple magnets (9), in particular permanent magnets, is provided in multiple rotor poles, 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 narrow sides (9s) of the magnets (9) facing away from the central region (11), characterised in that at least one pocket-cooling channel (15) is formed in the respective magnet pocket (10), which is fluidically connected to the shaft-cooling channel (13) and provided for cooling at least one magnet (9) in the magnet pocket (10).

Description

[0001] Description

[0002] title

[0003] Rotor of an electrical machine

[0004] State of the art

[0005] The invention is based on a rotor of an electrical machine according to the preamble of the main claim.

[0006] A rotor of an electrical machine is already known from WO21225902 A1, having a rotor shaft rotatable about a rotor axis and a rotor body arranged on the rotor shaft, which rotor body is designed in particular as a rotor laminated core comprising a multiplicity of laminated laminations, wherein a shaft cooling channel runs in the rotor shaft and wherein the rotor body has a plurality of rotor poles, each with a pole center, wherein at least one V-shaped, C-shaped or arc-shaped magnetic pocket with a plurality of magnets is provided in a plurality of the rotor poles, wherein the respective magnetic pocket has a magnet-free central region between two magnets and two magnet-free edge regions on the narrow sides of the magnets facing away from the central region.

[0007] The rotor is cooled by air that is passed through axial channels of the rotor.

[0008] Advantages of the invention

[0009] The rotor of an electrical machine according to the invention with the characterizing features of the main claim has the advantage that rotor cooling is improved by providing direct oil cooling of the magnets in the rotor. This is achieved according to the invention by forming at least one pocket cooling channel in the respective magnet pocket, which is fluidly connected to the shaft cooling channel and is provided for cooling at least one magnet of the magnet pocket. The measures listed in the subclaims enable advantageous refinements and improvements of the rotor of an electrical machine specified in the main claim.

[0010] According to a first and second embodiment, the respective pocket cooling channel can be formed in the central region of the respective magnetic pocket or in one of the edge regions of the respective magnetic pocket or, according to a third embodiment, in a recess of one of the magnets or between two recesses of two magnets.

[0011] According to an advantageous first embodiment, the respective magnetic pocket for fastening the magnets can be filled with a curable filler, in particular a potting compound or a molding material, wherein the respective pocket cooling channel is a cavity formed in the filler or at the edge of the filler, or outside of the filler, directly delimited by the walls of the respective magnetic pocket. In this way, less filler is required. Furthermore, the filler can be used to fasten the magnets and to embed or form the respective pocket cooling channel. The respective pocket cooling channel is further formed directly on or near one of the narrow sides of the respective magnet, so that the cooling of the magnet is further improved.

[0012] According to a first exemplary embodiment of the first embodiment, the respective pocket cooling channel can be formed by subsequently demolding a particularly conical demolding tool from the respective magnetic pocket, in particular from the filler of the respective magnetic pocket. In this way, the respective pocket cooling channel is formed without additional components in the filler or at the edge of the filler of the respective magnetic pocket.

[0013] According to a second embodiment of the first embodiment, the respective pocket cooling channel can be formed by a separate cooling tube embedded in the filler. This makes it possible to create particularly very long and thin cooling channels, which would otherwise fail due to a delicate tool.

[0014] According to a third exemplary embodiment of the first embodiment, the respective pocket cooling channel can be formed between one of the narrow sides of the respective magnet and a tubular half-shell adjacent to the narrow side of the magnet and embedded in the filler. In this way, the pocket cooling channel is formed directly on the magnet, thus achieving very good cooling of the magnet.

[0015] It is advantageous if two tubular half-shells are provided on opposite narrow sides of the respective magnet, with the magnet and the two tubular half-shells enclosed by a casing to form a magnet unit. This creates two pocket cooling channels directly on both narrow sides of the respective magnet, further improving magnet cooling and ensuring uniform cooling from both narrow sides.

[0016] 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 magnetic pocket, wherein the cavity is directly bounded by the walls of the respective magnetic pocket. The central region of the respective magnetic pocket is designed without a bridge web. The pocket cooling channel formed in this way must also be sealed against the rotor core.

[0017] 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 formed in the filler provided in the central region. The pocket cooling channel formed in this way is enclosed by the filler and thus sealed from the rotor core.

[0018] According to the first embodiment, the central region of the respective magnetic pocket can have a bridge web or be designed without a bridge web. If a bridge web is present, the respective V-shaped, C-shaped, or arcuate magnetic pocket is formed by two magnetic pockets separated from each other by the bridge web and together forming a V-shaped magnetic layer.

[0019] If a bridge web is present, a pocket cooling channel is formed in the central area, located to the side of the bridge web. If no bridge web is present, a pocket cooling channel formed in the bridge-free central area can be arranged at the pole center. A bridge-free central area significantly reduces the stray flux in the rotor and allows for a very large cooling channel with a lower pressure drop than a two-part cooling channel divided by the bridge web.

[0020] According to a second embodiment, it is advantageously provided that the central region of each magnetic pocket is formed without a bridge web, and a pocket cooling channel formed in the central region is formed by a hollow central region, and a pocket cooling channel formed in the edge region is formed by a hollow edge region. In this way, the pocket cooling channels can be formed without a curable filler, thereby reducing manufacturing costs.

[0021] In addition, the thermal resistance is reduced because the curable filler usually has a comparatively low thermal conductivity.

[0022] It is particularly advantageous if a magnetically non-conductive, rod-shaped pocket body, in particular made of a plastic or an elastomer, is arranged in the hollow central region and / or in the hollow edge regions of the respective magnetic pocket to narrow the cross-section of the pocket cooling channel formed in the central region or in the edge region. In this way, a high flow velocity can be achieved in the respective pocket cooling channel, in particular to achieve turbulent flow, and thus better cooling of the rotor magnets. Furthermore, no stray flux can flow through the magnetically non-conductive pocket body.

[0023] According to an advantageous embodiment, the respective pocket body can be designed as a round bar or corner bar, in particular made of solid material, and in particular made of a plastic or an elastomer. The respective pocket body is designed such that it rests against the respective outer pole segment and the respective inner pole segment in the respective magnetic pocket, in particular being clamped between the two pole segments.

[0024] It is further advantageous if the rotor body is enclosed by a rotor sleeve, in particular a fiber composite sleeve, particularly for preloading the outer pole segments of the rotor body against the magnets of the respective magnetic pocket. In this way, in the case of the second embodiment, the outer pole segments are each clamped against one of the inner pole segments via the magnets and the pocket bodies. For this purpose, the respective pocket body, for example, has a lower rigidity than the magnets. This ensures that the magnets of the respective magnetic pocket are clamped and thus fixed.

[0025] It is also advantageous if the rotor sleeve extends axially beyond the rotor body to annularly enclose two end-face cover plates of the rotor, each in a joining area. The respective cover plate then fits flush with the outer diameter of the rotor body, and the joining area of ​​the cover plates is covered by the rotor sleeve, sealing the cover plates and thus the cooling circuit in the rotor from the outside.

[0026] It is also advantageous if each pocket cooling channel has a pocket channel inlet for supplying cooling fluid from the shaft cooling channel and a pocket channel outlet for discharging the cooling fluid, wherein the pocket channel inlets of a first group of pocket cooling channels are formed on one of the two end faces and the pocket channel inlets of a second group of pocket cooling channels are formed on the other end face of the rotor to generate an opposing flow through the pocket cooling channels in the two groups of pocket cooling channels. According to a first grouping variant, the first group of pocket cooling channels can be arranged, for example, in a first group of rotor poles, and the second group of pocket cooling channels can be arranged, for example, in a second group of rotor poles.According to an alternative second grouping variant, the first group of pocket cooling channels can be formed by the pocket cooling channels located in the central regions, and the second group of pocket cooling channels can be formed by the pocket cooling channels located in the peripheral regions. In this way, the flow through the pocket cooling channels during rotor operation occurs in opposite directions. For example, the first group and the second group comprise the same number of pocket cooling channels or, in total, the same flow cross-section. This results in uniform cooling of the rotor, particularly in the axial direction.

[0027] The rotor body has a cover plate on each of its two faces. The first cover plate contains first connecting channels to the pocket channel inlets of the first group of pocket cooling channels, and the second cover plate contains second connecting channels to the pocket channel inlets of the second group of pocket cooling channels. According to a first connection variant, the first and second connecting channels of the two cover plates are each fluidly connected to the shaft cooling channel. In this way, a parallel connection of all pocket cooling channels of the rotor is achieved.

[0028] According to a second connection variant, the first connecting channels are fluidly connected to the shaft cooling channel, and the second connecting channels are fluidly connected to the pocket channel outlets of the first group of pocket cooling channels. In particular, the second connecting channels are each fluidly connected to at least one of the pocket channel outlets of the first group of pocket cooling channels. According to the alternative second grouping variant, the second connecting channel can connect pocket cooling channels located within the same rotor pole. In this way, a series connection of the pocket cooling channels of the first group with the pocket cooling channels of the second group is achieved.

[0029] It is also advantageous if the pocket channel outlets are each fluidly connected to an outlet channel in one of the two cover plates, wherein the outlet channels of the cover plates each have outlet openings for cooling one of the winding heads of a stator, wherein the outlet openings are located in particular on an end face or on an outer circumference of the respective cover plate, or open into a return section of the shaft cooling channel. In this way, a cooling circuit is formed.

[0030] Furthermore, it is advantageous if each collecting channel is fluidly connected to several pocket channel outlets, in particular a rotor pole, whose pocket cooling channels have a different radial position, wherein the collecting channels of the cover disks extend radially inward relative to the rotor axis from the respective pocket channel outlet to the outlet openings. In this way, a uniform flow through the pocket cooling channels connected to the same collecting channel is achieved due to static pressure recovery.

[0031] The invention further relates to an electric machine with a rotor according to the invention. Drawing

[0032] Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description

[0033] They show:

[0034] Fig.1 shows a rotor of an electrical machine with a parallel connection of the pocket cooling channels according to the invention,

[0035] Fig.2 is a sectional view of the rotor according to Fig.1 along the line ll-ll in Fig.1,

[0036] Fig.3 one of the rotor poles of the rotor according to Fig.1 according to a first embodiment of a first embodiment,

[0037] Fig.4 one of the rotor poles of the rotor according to Fig.1 according to a second embodiment of the first embodiment,

[0038] Fig.5 one of the rotor poles of the rotor according to Fig.1 according to a third embodiment of the first embodiment,

[0039] Fig.6 one of the rotor poles of the rotor according to Fig.1 according to a first embodiment of a second embodiment,

[0040] Fig.7 one of the rotor poles of the rotor according to Fig.1 according to a third embodiment,

[0041] Fig.8 shows a rotor of an electrical machine with a series connection of the pocket cooling channels according to the invention,

[0042] Fig.9 is a partial view of a section through a cover plate of the rotor along a line IX-IX in Fig.2 for the first embodiment of the second embodiment according to Fig.6,

[0043] Fig.10 one of the rotor poles of the rotor according to Fig.1 according to a second embodiment of the second embodiment,

[0044] Fig.11 is a sectional view of the rotor according to Fig.10,

[0045] Fig.12 one of the rotor poles of the rotor according to Fig.1 according to a fourth embodiment of the first embodiment and

[0046] Fig. 13 shows one of the rotor poles of the rotor according to Fig. 1 according to a fifth embodiment of the first embodiment. Description of the embodiments

[0047] Fig.1 shows a rotor of an electrical machine with a parallel connection of the pocket cooling channels according to the invention.

[0048] The rotor 1 of an electrical machine, in particular a permanent magnet 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 laminations 5

[0049] A shaft cooling channel 13 runs in the rotor shaft 3. The rotor body 4 has several rotor poles 6, each with a pole center 7.

[0050] In several of the rotor poles 6, for example in each rotor pole 6, at least one V-shaped, C-shaped or arc-shaped magnet pocket 10 is provided for receiving a plurality of magnets 9, in particular permanent magnets.

[0051] In the respective magnetic pocket 10, a magnetic layer 8 is formed by a plurality of magnets 9. For example, the magnetic layer 8 comprises two magnets 9, which are arranged, for example, in a V-shape according to Fig. 1. The magnetic layer 8 is arranged, for example, symmetrically to the respective pole center 7. The respective rotor pole 6 is divided by the respective magnetic layer 8 in the radial direction relative to the rotor axis 2 into an inner pole segment 6i and an outer pole segment 6a.

[0052] The respective magnetic pocket 10 can also be a magnetic layer 8 which comprises two magnetic pockets which are separated from each other by a bridge web.

[0053] The respective magnetic pocket 10 has a magnet-free central region 11 between two magnets 9 and two magnet-free edge regions 12 on the narrow sides 9s of the magnets 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 two narrow sides 9s of two magnets 9 of the magnetic pocket 10 facing towards the pole center 7. The magnetic layer 8 comprises two legs set at an angle, wherein the edge regions 12 are provided at the mutually opposite leg ends of the magnetic layer 8, in particular at or near the narrow sides 9s facing away from the central region 11. The respective edge region 12 of the respective magnetic pocket 10 can have a bridging web towards the outer circumference of the rotor body 4 or can be designed without a bridging web.

[0054] Fig.2 shows a sectional view of the rotor according to Fig.1 along the line ll-ll in Fig.1 .

[0055] According to the invention, at least one pocket cooling channel 15 is formed in the respective magnet pocket 10, which is fluidly connected to the shaft cooling channel 13 and is provided for cooling at least one magnet 9 of the magnet pocket 10. For example, several pocket cooling channels 15 can also be formed in the respective magnet pocket 10.

[0056] According to the first and second embodiments, the respective pocket cooling channel 15 can be formed in the central region 11 of the respective magnetic pocket 10 or in one of the edge regions 12 of the respective magnetic pocket 10.

[0057] According to the first and second embodiments, the central region 11 of the respective magnet pocket 10 can have a bridge web 22 for connecting the outer pole segment 6a and the inner pole segment 6i or can be designed without a bridge web.

[0058] Each pocket cooling channel 15 has a pocket cooling channel inlet 15e for supplying cooling fluid from the shaft cooling channel 13 and a pocket cooling channel outlet 15a for discharging the cooling fluid. The pocket cooling channel inlets 15e of a first group 14.1 of pocket cooling channels 15 can be configured on one of the two end faces, and the pocket cooling channel inlets 15e of a second group 14.2 of pocket cooling channels 15 can be configured on the other end face of the rotor 1 to generate an opposing flow through the pocket cooling channels 15 in the two groups 14.1, 14.2 of pocket cooling channels 15. According to the first grouping variant, the first group 14.1 of pocket cooling channels 15 can be arranged, in particular, in a first group of rotor poles 6, and the second group 14.2 of pocket cooling channels 15 can be arranged, in particular, in a second group of rotor poles 6. The first group 14.1 of pocket cooling channels 15 is formed, for example, by the pocket cooling channels 15 of each second rotor pole 6, viewed in the circumferential direction. The second group 14.2 of pocket cooling channels 15 is formed, for example, by the pocket cooling channels 15 of each remaining second rotor pole 6, viewed in the circumferential direction. In all embodiments, the rotor body 4 has a cover plate 25 on each of its two end faces, with first connecting channels 26.1 to the pocket channel inlets 15e of the first group 14.1 of pocket cooling channels 15 being formed in the first cover plate 25.1, and second connecting channels 26.2 to the pocket channel inlets 15e of the second group 14.2 of pocket cooling channels 15 being formed in the second cover plate 25.2. The first and second connecting channels 26.1, 26.2 of the two cover plates 25 are fluidly connected to the shaft cooling channel 13, so that a parallel connection of all pocket cooling channels 15 is achieved.

[0059] Each connecting channel 26.1 can open into several pocket channel inlets 15e and thus function as a distribution channel.

[0060] The cover plates 25.1, 25.2 are designed to be flush with the rotor body 4 in the radial direction with respect to the rotor axis 2, for example.

[0061] Fig.3 shows one of the rotor poles of the rotor according to Fig.1 according to a first embodiment of the first embodiment.

[0062] According to the first embodiment, the respective magnetic pocket 10 is filled with a curable filler 17, in particular a casting 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 an edge of the respective magnetic pocket 10 and an edge of the filler 17.

[0063] According to the first exemplary embodiment of the first embodiment in Fig. 3, the respective pocket cooling channel 15 is formed by subsequent demolding or pulling out a, for example, conical demolding tool from the respective magnetic pocket 10, in particular from the filler 17 of the respective magnetic pocket 10. According to Fig. 3, for example, two pocket cooling channels 15 are formed in the central region 11 and one pocket cooling channel 15 is formed in each of the two edge regions 12. Instead of the two pocket cooling channels 15 in the central region 11, only one pocket cooling channel 15 can be formed in the central region 11. Of course, fewer than four pocket cooling channels 15 could also be provided in the respective magnetic pocket 10, for example, only in the central region 11 or only in the edge regions 12.

[0064] Fig. 4 shows one of the rotor poles of the rotor according to Fig. 1 according to a second exemplary embodiment of the first embodiment. According to the second exemplary embodiment of the first embodiment, the respective pocket cooling channel 15 is formed by a separate cooling tube 18 embedded in the filler 17. According to Fig. 4, for example, a cooling tube 18 is provided in the central region 11 and a cooling tube 18 is also provided in each of the two edge regions 12. Of course, fewer than three pocket cooling channels 15 could also be provided in the respective magnet pocket 10, for example, only in the central region 11 or only in the edge regions 12.

[0065] Fig.5 shows one of the rotor poles of the rotor according to Fig.1 according to a third embodiment of the first embodiment.

[0066] According to the third exemplary embodiment of the first embodiment, the respective pocket cooling channel 15 is formed between one of the narrow sides 9s of the respective magnet 9 and a pipe half-shell 19 adjacent to the narrow side 9s of the magnet 9 and embedded in the filler 17. The pipe half-shell 19 also includes pipe shells that encompass slightly more or less than half the cross-section of the pipe.

[0067] According to the third embodiment, two pipe half-shells 19 are provided on the two opposite narrow sides 9s of the respective magnet 9, wherein the magnet 9 and the two pipe half-shells 19 are enclosed by a casing 20 to form a magnet unit.

[0068] Fig.6 shows one of the rotor poles of the rotor according to Fig.1 according to a first embodiment of a second embodiment.

[0069] According to the first exemplary embodiment of the second embodiment, the central region 11 of the respective magnet pocket 10 is designed without a bridge web, wherein a pocket cooling channel 15 formed in the central region 11 is formed by a hollow central region 11 and a pocket cooling channel 15 formed in the edge region 12 is formed by a hollow edge region 12. 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 a narrow side 9s of the respective magnet 9 facing away from the central region 11 and by the sides of the magnet pocket 10 in the region of the leg end.A magnetically non-conductive, rod-shaped pocket body 23, in particular made of a plastic or an elastomer, can be arranged in the hollow central region 11 and / or in the hollow edge regions 12 of the respective magnetic pocket 10 to narrow the cross-section of the pocket cooling channel 15 formed in the central region 11 or in the edge region 12. In this case, the pocket cooling channel 15 is formed between the pocket body 23 and the narrow side 9s of the respective magnet 9.

[0070] However, the pocket bodies 23 according to Fig.6 can also be expressly omitted.

[0071] According to Fig. 6, for example, one pocket body 23 is provided in the central region 11 and one pocket body 23 is provided in each of the two edge regions 12. Of course, fewer than three pocket bodies 23 could be provided in the respective magnetic pocket 10, for example, only one pocket body 23 located in the central region 11. The pocket body 23 located in the central region 11 is arranged, for example, symmetrically to the pole center 7.

[0072] According to the second embodiment, the rotor body 4 is enclosed by a rotor sleeve 24, in particular a fiber composite sleeve, which is manufactured or mounted with prestress to prestress the outer pole segments 6a against the magnets 9 of the magnetic layers 8.

[0073] The respective pocket body 23 rests in the respective magnet pocket 10 on the respective outer pole segment 6a and the respective inner pole segment 6i and is clamped by the prestressed rotor sleeve 24, for example, between the two pole segments 6a, 6i.

[0074] A casting compound (not shown), in particular an epoxy resin, can be provided on the broad sides of the magnets 9 for fixing the magnets or for sealing.

[0075] Fig. 7 shows one of the rotor poles of the rotor according to Fig. 1 according to a third embodiment. According to the 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.

[0076] Fig.8 shows a rotor of an electrical machine with an alternative series connection of the pocket cooling channels according to the invention.

[0077] As an alternative to the parallel connection of the pocket cooling channels 15 according to Fig. 1, in all embodiments 8, the first connecting channels 16.1 of the first cover plate 25.1 can be fluidly connected to the shaft cooling channel 13, and the second connecting channels 16.2 of the second cover plate 25.2 can be fluidly connected to the pocket channel outlets 15a of the first group 14.1 of pocket cooling channels 15, so that a series connection of the pocket cooling channels 15 of the first group 14.1 with the pocket cooling channels 15 of the second group 14.2 is achieved. In particular, the second connecting channels 16.2 are each fluidly connected to one of the pocket channel outlets 15a of the first group 14.1 of pocket cooling channels 15. According to the alternative second grouping variant, the second connecting channel 16.2 can connect pocket cooling channels 15 located within the same rotor pole 6.

[0078] Fig.9 shows a partial view of a section through a cover plate of the rotor along a line IX-IX in Fig.2 for the first embodiment of the second embodiment according to Fig.6.

[0079] In all embodiments, each pocket channel outlet 15a is fluidly connected to a collecting channel 27 in one of the two cover plates 25.1, 25.2, wherein the collecting channels 27 of the cover plates 25.1, 25.2 each have outlet openings 28, which can be located on an end face or on an outer circumference of the respective cover plate 25.1, 25.2 or open into a return section of the shaft cooling channel 13. A plurality of collecting channels 27 can be formed in each of the cover plates 25.1, 25.2.

[0080] Each collecting channel 27 can be fluidly connected to a plurality of pocket channel outlets 15a, in particular of a rotor pole 6, whose pocket cooling channels 15 have a different radial position with respect to the rotor axis 2, wherein the collecting channels 27 of the cover disks 25.1, 25.2 extend from the respective pocket channel outlet 15a to the outlet openings 28 in each case radially inward with respect to the rotor axis 2.

[0081] Fig.10 shows one of the rotor poles of the rotor according to Fig.1 according to a second embodiment of the second embodiment.

[0082] The second embodiment of the second embodiment according to Fig.10 differs from the first embodiment according to Fig.6 only in that two magnetic layers 8 with pocket bodies 23 according to the invention are provided.

[0083] Fig.11 shows a sectional view of the rotor according to Fig.10.

[0084] The rotor sleeve 24 can extend in the axial direction with respect to the rotor axis 2 beyond the rotor body 4 to annularly enclose the two cover plates 25.1, 25.2 of the rotor 1 arranged on the end face, each in a 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 plate 25.1, 25.2, which can be designed to be particularly liquid-tight.

[0085] Also in Fig.11, the collecting channels 27 of the cover discs 25.1, 25.2 run from the respective pocket channel outlet 15a to the outlet openings 28, each radially inward with respect to the rotor axis 2.

[0086] Fig.12 shows one of the rotor poles of the rotor according to Fig.1 according to a fourth embodiment of the first embodiment.

[0087] According to the fourth exemplary embodiment of the first embodiment, the central region 11 of the respective magnetic pocket 10 is designed without bridge webs. A single pocket cooling channel 15 is formed in the central region 11 by a hollow central region 11 outside the filler 17. The magnetic pocket 10 is filled with the filler 17 via a sprue outside the central region 11, for example, in at least one of the edge regions 12, and the central region 11 is kept completely free of filler 17, for example, by means of a subsequently removable demolding tool or by pressureless filling with filler. The central region 11 of the magnetic pocket 10 is designed, for example, triangularly or trapezoidally. The narrow side 9s of the respective magnet 9 facing the central region 11 remains free of filler 17, for example, due to a seal on the rotor body 4 or on the demolding tool.The respective magnet pocket 0 can have a recess on an inner side facing a broad side of the respective magnet 9, which recess is provided to improve ventilation when filling the filler 17 and is designed in particular near a positioning lug for positioning the magnet 9.

[0088] Fig.13 shows one of the rotor poles of the rotor according to Fig.1 according to a fifth embodiment of the first embodiment.

[0089] According to the fifth exemplary embodiment of the first embodiment, the central region 11 of the respective magnetic pocket 10 is designed without a bridge web. A single pocket cooling channel 15 is formed in the central region 11 of the respective magnetic pocket 10 by filling the magnetic pocket 10 with the filler 17 via a sprue outside the central region 11, for example, in at least one of the edge regions 12, and keeping the central region 11 free of filler 17 in a partial cross-section that is smaller than the cross-section of the central region 11 by means of a subsequently removable demolding tool.

[0090] The resulting pocket cooling channel 15 is surrounded by filler 17 and sealed by the filler 17. The central region 11 of the magnetic pocket 10 is, for example, triangular or trapezoidal in shape.

Claims

Claims 1. Rotor of an electrical machine, in particular a permanent magnet synchronous machine, with a rotor shaft (3) rotatable about a rotor axis (2) and a rotor body (4) arranged on the rotor shaft (3), which is designed in particular as a rotor laminated core comprising a plurality of laminated laminations (5), wherein a shaft cooling channel (13) runs in the rotor shaft (3) and 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 magnetic pocket (10) with a plurality of magnets (9), in particular permanent magnets, is provided in several of the rotor poles (6), wherein the respective magnetic pocket (10) has a magnet-free central region (11) between two magnets (9) and two magnet-free edge regions (12) on narrow sides (9s) of the magnets (9) facing away from the central region (11), characterized in thatthat in the respective magnet pocket (10) at least one pocket cooling channel (15) is formed, which is fluidly connected to the shaft cooling channel (13) and is provided for cooling at least one magnet (9) of the magnet pocket (10).

2. Rotor according to claim 1, characterized in that the respective pocket cooling channel (15) is formed a. in the central region (11) of the respective magnetic pocket (10) or in one of the edge regions (12) of the respective magnetic pocket (10) or b. in a recess (16) of one of the magnets (9) or between two recesses (16) of two magnets (9).

3. Rotor according to one of claims 1 or 2, characterized in that the respective magnetic pocket (10) for fastening the magnets (9) is filled with a curable filler (17), in particular a casting compound or a molding material, wherein the respective pocket cooling channel (15) is a cavity which is formed in the filler (17) or at the edge of the filler (17) or is delimited outside of the filler (17) directly by walls of the respective magnetic pocket (10).

4. Rotor according to claim 3, characterized in that the respective pocket cooling channel (15) is formed by subsequent demoulding of a particularly conical demoulding tool from the respective magnetic pocket (10), in particular from the filler (17) of the respective magnetic pocket (10).

5. Rotor according to claim 3, characterized in that the respective pocket cooling channel (15) is formed by a separate cooling tube (18) embedded in the filler (17).

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

7. Rotor according to claim 6, characterized in that two tubular half-shells (19) are provided on opposite narrow sides (9s) of the respective magnet (9), wherein the magnet (9) and the two tubular half-shells (19) are enclosed by a casing (20) to form a magnet unit.

8. Rotor according to one of claims 2 or 3, characterized in that the central region (11) of the respective magnetic pocket (10) has a bridge web (22) or is designed without a bridge web.

9. Rotor according to claim 8, characterized in that the central region (11) of the respective magnetic pocket (10) is in each case designed without a bridge web, wherein a pocket cooling channel (15) formed in the central region (11) is formed by a hollow central region (11) and a pocket cooling channel (15) formed in the edge region (12) is formed by a hollow edge region (12).

10. Rotor according to claim 9, characterized in that in the hollow central region (11) and / or in the hollow edge regions (12) of the respective magnetic pocket (10) there is arranged in each case a magnetically non-conductive rod-shaped pocket body (23), in particular made of a plastic or an elastomer, for narrowing the cross-section of the pocket cooling channel (15) formed in the central region (11) or in the edge region (12). 11 . Rotor according to one of the preceding claims, characterized in that the rotor body (4) is surrounded by a rotor sleeve (24), in particular a Fiber composite sleeve, is enclosed, in particular for prestressing outer pole segments (6a) of the rotor body (4) against the magnets (9) of the respective magnet pocket (10).

12. Rotor according to claim 11, characterized in that the rotor sleeve (24) extends in the axial direction beyond the rotor body (4) for annularly enclosing two cover plates (25.1, 25.2) of the rotor (1) arranged on the end face, each in a joining region (24.1), wherein in particular a joining connection is provided between the respective joining region (24.1) of the rotor sleeve (24) and the respective cover plate (25.1, 25.2).

13. Rotor according to one of the preceding claims, characterized in that each pocket cooling channel (15) has a pocket channel inlet (15e) for supplying cooling fluid from the shaft cooling channel (13) and a pocket channel outlet (15a) for discharging the cooling fluid, wherein a. the pocket channel inlets (15e) of a first group (14.1) of pocket cooling channels (15) are on one of the two end faces and b. the pocket channel inlets (15e) of a second group (14.2) of pocket cooling channels (15) are designed on the other end face of the rotor (1) to generate an opposite flow through the pocket cooling channels (15) in the two groups (14.1, 14.2) of pocket cooling channels (15), wherein the first group (14.1) of pocket cooling channels (15) is arranged in particular in a first group of rotor poles (6) and the second group (14.2) of pocket cooling channels (15) is arranged in particular in a second group of rotor poles (6), or wherein the first group (14.1) of pocket cooling channels (15) is formed by the pocket cooling channels (15) located in the central regions (11) and the second group (14.2) of pocket cooling channels (15) is formed by the pocket cooling channels (15) located in the edge regions (12).

14. Rotor according to claim 13, characterized in that the rotor body (4) has a cover plate (25.1, 25.2) on each of its two end faces, wherein in the first cover plate (25.1) first connecting channels (26.1) to the pocket channel inlets (15e) of the first group (14.1) of pocket cooling channels (15) and in the second cover plate (25.2) second connecting channels (26.2) to the pocket channel inlets (15e) of the second group (14.2) of pocket cooling channels (15) are formed, wherein a. the first and second connecting channels (26.1, 26.2) of the two cover plates (25.1, 25.2) are fluidly connected to the shaft cooling channel (13) or b. the first connecting channels (26.1) are fluidly connected to the shaft cooling channel (13) and the second connecting channels (26.2) are fluidly connected to the pocket channel outlets (15a) of the first group (14.1) of pocket cooling channels (15). Rotor according to one of claims 13 or 14, characterized in that each pocket channel outlet (15a) is fluidly connected to a collecting channel (27) in one of the two cover plates (25.1, 25.2), wherein the collecting channels (27) of the cover plates (25.1, 25.2) each have outlet openings (28) which are located in particular on an end face or on an outer circumference of the respective cover plate (25.1, 25.2), or open into a return section of the shaft cooling channel (13).Rotor according to claim 15, characterized in that each collecting channel (27) is fluidly connected to a plurality of pocket channel outlets (15a), in particular of a rotor pole (6), whose pocket cooling channels (15) have a different radial position relative to the rotor axis (2), wherein the collecting channels (27) of the cover disks (25.1, 25.2) extend from the respective pocket channel outlet (15a) to the outlet openings (28) in a radially inward direction relative to the rotor axis (2). An electrical machine with a rotor (81) according to any one of the preceding claims.

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