Rotor of an electrical machine

Abstract

A rotor for an electric machine, in particular a permanent magnet 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), in particular configured as a rotor lamination stack including a number of laminated laminations (5), in which a shaft cooling passage (13) extends through the rotor shaft (3); the rotor body (4) has a plurality of rotor poles (6), each having a pole center (7); a plurality of the rotor poles have a plurality of magnets (9), in particular permanent magnets, each having at least one The magnet pockets (10) are provided in a V-shaped, C-shaped, or arc-shaped configuration, each of which has a central region (11) without magnets between two magnets (9) and two edge regions (12) without magnets on the short sides (9s) of the magnets (9) facing away from the central region (11), and each of which has at least one pocket cooling passage (15) formed in fluid communication with the shaft cooling passage (13) and intended for cooling at least one magnet (9) of the magnet pocket (10).

Description

Technical Field

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[0001] The present invention relates to a rotor of an electric machine belonging to the field of independent claims.

Background Art

[0006] The measures described in the cited claims enable preferred developments and improvements of the rotor of the electromachine described in the independent claims.

[0007] Each pocket cooling passage may be formed in the central region of each magnet pocket or in one of the edge regions of each magnet pocket, according to the first and second embodiments, or in a notch of one of the magnets or between two notches of two magnets, according to the third embodiment.

[0008] In a preferred first embodiment, each magnet pocket may be filled with a curable filler material, particularly a sealing compound or molding material, for mounting the magnet, and each pocket cooling passage is a hollow space formed in or at the edge of the filler material, or directly separated from the outside of the filler material by the wall of each magnet pocket. In this way, even less filler material is required. Furthermore, the filler material can be used for mounting the magnet and for embedding or forming each pocket cooling passage. Furthermore, each pocket cooling passage may be formed directly on or near one of the short sides of each magnet, thereby further improving the cooling of the magnet.

[0009] In the first embodiment of the first embodiment, each pocket cooling passage may be formed by post-demolition release from each magnet pocket, and in particular from the filling material of each magnet pocket, especially by a tapered release tool. In this way, each pocket cooling passage is formed in or at the edge of the filling material of each magnet pocket without additional components.

[0010] In a second embodiment of the first embodiment, each pocket cooling passage may be formed by a separate cooling tube embedded in the packing material. In this way, it is possible to create particularly long and narrow cooling passages that would otherwise be abandoned because they would require an elaborate mold.

[0011] In the third embodiment of the first embodiment, each pocket cooling passage may be formed between one of the short sides of each magnet and a tube half-shell embedded in the packing material that abuts against the short side of the magnet. In this way, the pocket cooling passage is formed in direct contact with the magnet, thereby achieving very good cooling of the magnet.

[0012] Preferably, two tube half-shells are provided on the opposite short sides of each magnet, and the magnet and both tube half-shells are surrounded by an outer casing to form a magnet unit. In this way, two pocket cooling passages are formed in direct contact with both short sides of each magnet, thereby further improving the cooling of the magnet and ensuring even cooling from both short sides.

[0013] In the fourth embodiment of the first embodiment, each pocket cooling passage is formed by a hollow space in the central region of each magnet pocket, and the hollow space is directly demarcated by the wall of each magnet pocket. In this case, the central region of each magnet pocket is created without a bridge web. The pocket cooling passage thus formed must be additionally sealed to the rotor plate stack.

[0014] In the fifth embodiment of the first embodiment, each pocket cooling passage is formed by a hollow space in the central region of each magnet pocket, and the hollow space is created in a packing material provided in the central region. The pocket cooling passage thus formed is surrounded by the packing material and thereby sealed to the rotor plate stack.

[0015] In the first embodiment, the central region of each magnet pocket may or may not have a bridge web. If a bridge web is present, each V-shaped, C-shaped, or arc-shaped magnet pocket is formed by two magnet pockets separated from each other by the bridge web, which together form a V-shaped magnet layer.

[0016] When a bridge web is present, the pocket cooling passage formed in the central region is located laterally to the bridge web. When a bridge web is absent, the pocket cooling passage formed in the bridge-free central region can be located polar-centered. The bridge-free central region significantly reduces leakage flux in the rotor and allows for a much larger cooling passage with less pressure drop than a cooling passage consisting of two parts divided by a bridge web.

[0017] In the second embodiment, it is preferable that the central region of each magnet pocket is constructed without a bridge web, the pocket cooling passage formed in the central region is formed by a hollow central region, and the pocket cooling passage formed in the edge region is formed by a hollow edge region. In this way, the pocket cooling passage can be formed without a curable filler, thereby reducing manufacturing costs.

[0018] Furthermore, thermal resistance is reduced, because curable fillers often have relatively low thermal conductivity.

[0019] It is particularly preferable that magnetically impermeable rod-shaped pocket bodies, especially made of plastic or elastomer, are positioned in the hollow central region and / or hollow rim region of each magnet pocket to narrow the cross-section of the pocket cooling passages formed in the central or rim region. In this way, high flow velocities, especially for turbulent flow, can be achieved in each pocket cooling passage, and consequently, improved cooling of the rotor magnets can be achieved. Furthermore, leakage flux cannot flow through the magnetically impermeable pocket bodies.

[0020] In a preferred embodiment, each pocket body is constructed as a round or square bar, particularly made of a solid material, and may be made of plastic or elastomer in particular. Each pocket body is constructed to abut against each pole outer segment and each pole inner segment within each magnet pocket, particularly to be sandwiched between both pole segments.

[0021] Furthermore, it is preferable that the rotor body is surrounded by a rotor sleeve, particularly a composite fiber sleeve, in order to preload the outermost segments of the rotor body, especially toward the magnets of each magnet pocket. In this way, in the second embodiment, the outermost segments are preloaded toward one of the innermost segments, each via the magnets and the pocket bodies. For this purpose, each pocket body has a lower rigidity than, for example, the magnets. This ensures that the magnets of each magnet pocket are sandwiched and thus fixed.

[0022] Furthermore, it is preferable that the rotor sleeve extends axially beyond the rotor body to annularly surround the two rotor cover discs, each positioned on the end face side in the joining region. In this case, each cover disc follows the outer diameter of the rotor body on the same plane, the joining region of the cover discs is covered by the rotor sleeve, and thereby the cooling circuit of the cover discs and consequently the rotor is sealed from the outside.

[0023] It is also preferable that each pocket cooling passage has a pocket passage inlet for the supply of cooling fluid from the shaft cooling passage and a pocket passage outlet for the discharge of the cooling fluid. The pocket passage inlets of the pocket cooling passages of the first group are formed in one of the two end faces, and the pocket passage inlets of the pocket cooling passages of the second group are formed in the other end face of the rotor, and are formed to generate a counter-flow through the pocket cooling passages in both of these groups of pocket cooling passages. In the first grouping mode, the pocket cooling passages of the first group may be arranged, for example, in the rotor poles of the first group, and the pocket cooling passages of the second group may be arranged, for example, in the rotor poles of the second group. In the alternative second grouping mode, the pocket cooling passages of the first group may be formed by the pocket cooling passages located in the central region, and the pocket cooling passages of the second group may be formed by the pocket cooling passages located in the edge region. In this way, the pocket cooling passages are each flowed through in opposite directions during the operation of the rotor. For example, the first group and the second group include the same number of pocket cooling passages, or have equal total flow cross-sectional areas. Thereby, an even cooling of the rotor is provided, especially when viewed axially.

[0024] The rotor body has one cover disk on each of the two end faces. The first cover disk has a first connecting passage to the pocket passage inlet of the pocket cooling passages of the first group, and the second cover disk has a second connecting passage to the pocket passage inlet of the pocket cooling passages of the second group.

[0025] In the first piping mode, the first and second connecting passages of both cover disks are each in fluid connection with the shaft cooling passage. In this way, a parallel circuit of all the pocket cooling passages of the rotor is realized.

[0026] In the second piping arrangement, the first connection passage is fluidly connected to the shaft cooling passage, and the second connection passage is fluidly connected to the pocket passage outlet of the first group of pocket cooling passages. In particular, each second connection passage is fluidly connected to at least one of the pocket passage outlets of the first group of pocket cooling passages. In an alternative second grouping arrangement, each second connection passage can connect the pocket cooling passages located inside the same rotor pole to each other. In this way, a series circuit of the first group of pocket cooling passages and the second group of pocket cooling passages is realized.

[0027] Furthermore, it is preferable that each pocket passage outlet is fluidly connected to an outlet passage in one of both cover disks, and each outlet passage of the cover disk has an outlet opening for cooling one of the stator winding heads, and the outlet opening is particularly located on the end face or the outer periphery of each cover disk, or opens into the recirculation area of the shaft cooling passage. In this way, a cooling circuit is formed.

[0028] In addition to this, it is preferable that each collective passage, particularly each pocket cooling passage, is fluidly connected to a plurality of pocket passage outlets of rotor poles having different radial positions, and the collective passages of the cover disks extend radially inward with respect to the rotor axis from each pocket passage outlet toward the outlet opening. In this way, due to static pressure recovery, an even through-flow of the pocket cooling passages connected to the same collective passage is realized.

[0029] Furthermore, the present invention relates to an electric machine having a rotor according to the present invention.

Brief Description of the Drawings

[0030] Embodiments of the present invention are shown schematically in the drawings and will be described in detail in the following description.

[0031] The drawings show the following: [Figure 1]This shows a rotor of an electromachine having a parallel circuit of pocket cooling passages according to the present invention. [Figure 2] Figure 1 shows a cross-sectional view of the rotor along the line II-II in Figure 1. [Figure 3] One of the rotor poles of the rotor in Figure 1 is shown, based on the first embodiment of the first embodiment. [Figure 4] One of the rotor poles of the rotor in Figure 1 is shown, based on a second embodiment of the first embodiment. [Figure 5] One of the rotor poles of the rotor in Figure 1 is shown, based on a third embodiment of the first embodiment. [Figure 6] One of the rotor poles of the rotor in Figure 1 is shown, based on the first embodiment of the second embodiment. [Figure 7] One of the rotor poles of the rotor in Figure 1 is shown, based on the third embodiment. [Figure 8] This shows a rotor of an electromachine having a series circuit of pocket cooling passages according to the present invention. [Figure 9] Figure 6 shows a partial view of the cross-section of the rotor cover disk along the line IX-IX in Figure 2, in relation to the first embodiment of the second embodiment. [Figure 10] One of the rotor poles of the rotor in Figure 1 is shown, based on a second embodiment of the second embodiment. [Figure 11] Figure 10 shows a cross-sectional view of the rotor. [Figure 12] One of the rotor poles of the rotor in Figure 1 is shown, based on the fourth embodiment of the first embodiment. [Figure 13] One of the rotor poles of the rotor in Figure 1 is shown, based on the fifth embodiment of the first embodiment. [Modes for carrying out the invention]

[0032] Figure 1 shows a rotor of an electromechanical device having a parallel circuit of pocket cooling passages according to the present invention.

[0033] In an electromechanical device, particularly a permanent magnet-excited synchronous machine, the rotor 1 includes a rotor shaft 3 rotatable about a rotor axis 2, and a rotor body 4 positioned on the rotor shaft 3. The rotor body 4 is configured, for example, as a rotor plate stack containing a number of laminated plates 5.

[0034] A shaft cooling passage 13 extends into the rotor shaft 3. The rotor body 4 has multiple rotor poles 6, each having a pole center 7.

[0035] Some of the rotor poles 6, for example, each rotor pole 6, is provided with at least one V-shaped, C-shaped, or arc-shaped magnet pocket 10 for housing multiple magnets 9, particularly permanent magnets.

[0036] Within each magnet pocket 10, a magnet layer 8 is formed with multiple magnets 9. For example, in Figure 1, each magnet layer 8 includes two magnets 9 arranged in a V-shape as an example. The magnet layers 8 are arranged symmetrically with respect to each pole center 7, for example. Each rotor pole 6 is subdivided by its respective magnet layer 8 into an inner pole segment 6i and an outer pole segment 6a in the radial direction with respect to the rotor axis 2.

[0037] Each magnetic pocket 10 may be a magnetic layer 8 containing two magnetic pockets separated from each other by a bridge web.

[0038] Each magnet pocket 10 has a magnet-free central region 11 between two magnets 9, and two magnet-free edge regions 12 on the short side 9s of the magnet 9 facing away from the central region 11. Each central region 11 is formed in the region of the pole center 7 and, when viewed circumferentially, extends between the two short sides 9s of the two magnets 9 of the magnet pocket 10 that face the pole center 7. The magnet layer 8 includes two angled legs, and the edge regions 12 are provided at the opposite ends of the legs of the magnet layer 8, in particular on or near the short side 9s facing away from the central region 11. Each edge region 12 of each magnet pocket 10 may or may not have a bridge web toward the outer circumference of the rotor body 4.

[0039] Figure 2 shows a cross-sectional view of the rotor in Figure 1 along the line II-II in Figure 1.

[0040] According to the present invention, it is intended that at least one pocket cooling passage 15 is formed within each magnet pocket 10, which is fluidly connected to the shaft cooling passage 13 and intended for cooling at least one magnet 9 in the magnet pocket 10. For example, multiple pocket cooling passages 15 may be created within each magnet pocket 10.

[0041] In the first and second embodiments, each pocket cooling passage 15 may be formed in the central region 11 of each magnet pocket 10, or in one of the edge regions 12 of each magnet pocket 10.

[0042] In the first and second embodiments, the central region 11 of each magnet pocket 10 may have a bridge web 22 for connecting the outermost segment 6a and the innermost segment 6i, or it may be configured without a bridge web.

[0043] Each pocket cooling passage 15 has a pocket passage inlet 15e for supplying cooling fluid from the shaft cooling passage 13 and a pocket passage outlet 15a for discharging the cooling fluid. In this case, the pocket passage inlets 15e of the pocket cooling passages 15 of the first group 14.1 may be formed on one of the two end faces of the rotor 1, and the pocket passage inlets 15e of the pocket cooling passages 15 of the second group 14.2 may be formed on the other end face, so as to generate opposite throughflow of the pocket cooling passages 15 in both groups 14.1 and 14.2. In the first grouping configuration, the pocket cooling passages 15 of the first group 14.1 may be located in particular on the rotor poles 6 of the first group, and the pocket cooling passages 15 of the second group 14.2 may be located in particular on the rotor poles 6 of the second group. The pocket cooling passages 15 of the first group 14.1 may be formed, for example, by the pocket cooling passages 15 of every other rotor pole 6 when viewed in the circumferential direction. The second group 14.2 pocket cooling passages 15 are formed, for example, by the pocket cooling passages 15 of every other rotor pole 6 when viewed in the circumferential direction.

[0044] In all embodiments, the rotor body 4 has one cover disc 25 on each end face, the first cover disc 25.1 having a first connection passage 26.1 to the pocket passage inlet 15e of the first group 14.1 of pocket cooling passages 15, and the second cover disc 25.2 having a second connection passage 26.2 to the pocket passage inlet 15e of the second group 14.2 of pocket cooling passages 15. The first and second connection passages 26.1, 26.2 of both cover discs 25 are fluidly connected to the shaft cooling passage 13, thereby realizing a parallel circuit of all pocket cooling passages 15.

[0045] Each connecting passage 26.1 opens to multiple pocket passage entrances 15e, and in this way can function as a distribution passage.

[0046] The cover discs 25.1 and 25.2 are manufactured radially with respect to the rotor axis 2, for example, on the same plane as the rotor body 4.

[0047] Figure 3 shows one of the rotor poles of the rotor in Figure 1, based on the first embodiment of the first embodiment.

[0048] In the first embodiment, each magnet pocket 10 may be filled with a curable filler material 17, particularly a sealing compound or molding material, for mounting the magnets 9, and each pocket cooling passage 15 is a hollow space embedded in the filler material 17, or a hollow space formed between the edge of each magnet pocket 10 and the edge of the filler material 17.

[0049] In the first embodiment of the first embodiment shown in Figure 3, each pocket cooling passage 15 may be formed by subsequent demolding or removal from each magnet pocket 10, particularly from the filling material 17 of each magnet pocket 10, for example, by a tapered demolding tool. In Figure 3, two pocket cooling passages 15 are created in the central region 11 as an example, and one pocket cooling passage 15 is created in each of the edge regions 12. Instead of two pocket cooling passages 15 in the central region 11, only one pocket cooling passage 15 may be formed in the central region 11. Of course, each magnet pocket 10 may have fewer than four pocket cooling passages 15, for example, they may be provided only in the central region 11 or only in the edge regions 12.

[0050] Figure 4 shows one of the rotor poles of the rotor in Figure 1, based on a second embodiment of the first embodiment.

[0051] In the second embodiment of the first embodiment, each pocket cooling passage 15 is formed by a separate cooling tube 18 embedded in the packing material 17. In Figure 4, one cooling tube 18 is created in the central region 11 as an example, and similarly, one cooling tube 18 is created in each of the edge regions 12.

[0052] Naturally, each magnet pocket 10 may have fewer than three pocket cooling passages 15, for example, they may be provided only in the central region 11 or only in the edge region 12.

[0053] Figure 5 shows one of the rotor poles of the rotor in Figure 1, based on a third embodiment of the first embodiment.

[0054] In a third embodiment of the first embodiment, each pocket cooling passage 15 may be formed between one of the short sides 9s of each magnet 9 and a tube half-shell 19 embedded in the packing material 17 that abuts against the short side 9s of the magnet 9. A tube shell with a cross-section slightly larger or smaller than half the cross-section of the tube is also understood as a tube half-shell 19.

[0055] In the third embodiment, two tube half-shells 19 are provided on both opposite short sides 9s of each magnet 9, and the magnets 9 and both tube half-shells 19 are surrounded by an outer casing 20 to constitute a magnet unit.

[0056] Figure 6 shows one of the rotor poles of the rotor in Figure 1, based on the first embodiment of the second embodiment.

[0057] In the first embodiment of the second embodiment, the central region 11 of each magnet pocket 10 is configured without a bridge web, the pocket cooling passage 15 formed in the central region 11 is formed by the hollow central region 11, and the pocket cooling passage 15 formed in the edge region 12 is formed by the hollow edge region 12. Here, the hollow central region 11 is demarcated circumferentially by the short sides 9s of the two magnets 9 facing toward the pole centers 7, and radially with respect to the rotor axis 2 by the magnet pocket 10. The hollow edge region 12 is demarcated by the short sides 9s of each magnet 9 facing away from the central region 11, and by the sides of the magnet pocket 10 in the leg end region.

[0058] A magnetically impermeable rod-shaped pocket body 23, particularly made of plastic or elastomer, may be placed in the hollow central region 11 and / or hollow edge region 12 of each magnet pocket 10 to narrow the cross-section of the pocket cooling passage 15 formed in the central region 11 or edge region 12. In this case, the pocket cooling passage 15 is formed between the pocket body 23 and the short side 9s of each magnet 9.

[0059] However, the pocket body 23 shown in Figure 6 can clearly be omitted.

[0060] In Figure 6, one pocket body 23 is created in the central region 11 as an example, and one pocket body 23 is created in each of the edge regions 12. Naturally, each magnet pocket 10 may have fewer than three pocket bodies 23, for example, only one pocket body 23 located in the central region 11 may be provided. The pocket body 23 located in the central region 11 is arranged, for example, symmetrically with respect to the pole center 7.

[0061] In the second embodiment, the rotor body 4 is surrounded by a rotor sleeve 24, particularly a composite fiber sleeve, which is manufactured or assembled with a preload to apply a preload to the outermost segment 6a toward the magnets 9 of the magnet layer 8.

[0062] Each pocket body 23 is in contact with the respective outer pole segment 6a and the respective inner pole segment 6i within the respective magnet pocket 10, and is sandwiched, for example, between both pole segments 6a and 6i by the preloaded rotor sleeve 24.

[0063] A sealing compound, particularly epoxy resin, may be provided on the long side of the magnet 9 for fixing or sealing the magnet, although this compound may not be shown.

[0064] Figure 7 shows one of the rotor poles of the rotor in Figure 1, based on a third embodiment. In the third embodiment, the pocket cooling passage 15 is formed in one of the notches 16 of the magnets 9, or between the two notches 16 of the two magnets 9.

[0065] Figure 8 shows an electromechanical rotor having an alternative series circuit for pocket cooling passages according to the present invention.

[0066] As an alternative to the parallel circuit of pocket cooling passages 15 shown in Figure 1, in all embodiments 8, the first connection passage 16.1 of the first cover disk 25.1 may be fluidly connected to the shaft cooling passage 13, and the second connection passage 16.2 of the second cover disk 25.2 may be fluidly connected to the pocket passage outlet 15a of the pocket cooling passages 15 of the first group 14.1, thereby realizing a series circuit of the pocket cooling passages 15 of the first group 14.1 and the pocket cooling passages 15 of the second group 14.2. In particular, each second connection passage 16.2 is fluidly connected to one of the pocket passage outlets 15a of the pocket cooling passages 15 of the first group 14.1. In the alternative second grouping configuration, each second connection passage 16.2 can connect pocket cooling passages 15 located inside the same rotor pole 6 to each other.

[0067] Figure 9 shows a partial view of the cross-section of the rotor cover disk along the line IX-IX in Figure 2, for the first embodiment of the second embodiment of Figure 6.

[0068] In all embodiments, each pocket passage outlet 15a is fluidly connected to a collection passage 27 of one of the cover discs 25.1, 25.2, and each collection passage 27 of cover discs 25.1, 25.2 has an outlet opening 28 which may be located on the end face or outer circumference of each cover disc 25.1, 25.2, or which opens into the reflux area of ​​the shaft cooling passage 13. Each cover disc 25.1, 25.2 may be configured with multiple collection passages 27.

[0069] Each collection passage 27 may be fluidly connected to multiple pocket passage outlets 15a of rotor poles 6, each having a different radial position with respect to the rotor shaft 2, and the collection passages 27 of cover discs 25.1 and 25.2 extend radially inward with respect to the rotor shaft 2, starting from each pocket passage outlet 15a toward the outlet opening 28.

[0070] Figure 10 shows one of the rotor poles of the rotor in Figure 1, based on a second embodiment of the second embodiment.

[0071] The only difference between the second embodiment shown in Figure 10 and the first embodiment shown in Figure 6 is that the second embodiment is provided with two magnet layers 8 having pocket bodies 23 according to the present invention.

[0072] Figure 11 shows a cross-sectional view of the rotor in Figure 10.

[0073] The rotor sleeve 24 may extend axially beyond the rotor body 4 with respect to the rotor shaft 2 in order to annularly surround the two cover discs 25.1 and 25.2 of the rotor 1, which are positioned on the end face side in the joining region 24.1, respectively. A joining connection is provided between each joining region 24.1 of the rotor sleeve 24 and each cover disc 25.1 and 25.2, which may be made particularly liquid-tight.

[0074] In Figure 11, the collection passages 27 of the cover discs 25.1 and 25.2 extend radially inward with respect to the rotor axis 2, starting from the respective pocket passage exits 15a and toward the exit openings 28.

[0075] Figure 12 shows one of the rotor poles of the rotor in Figure 1, based on a fourth embodiment of the first embodiment.

[0076] In the fourth embodiment of the first embodiment, the central region 11 of each magnet pocket 10 is configured without a bridge web. A single pocket cooling passage 15 is formed in the central region 11 by a hollow central region 11 outside the filler material 17, which is achieved by filling the magnet pocket 10 with the filler material 17 through a sprue outside the central region 11, for example, in at least one of the edge regions 12, and keeping the central region 11 completely free of the filler material 17, for example by a release tool that can be removed afterward, or by pressureless filling of the filler material. The central region 11 of the magnet pocket 10 is created in the shape of, for example, a triangle or a trapezoid. The short side 9s of each magnet 9 facing the central region 11 is kept free of the filler material 17, for example by sealing in the rotor body 4 or a release tool. Each magnet pocket 10 may have a notch on the inside facing the long side of each magnet 9, which is provided to improve ventilation during filling of the filler material 17, and is formed particularly near a positioning lug for positioning the magnet 9.

[0077] Figure 13 shows one of the rotor poles of the rotor in Figure 1, based on a fifth embodiment of the first embodiment.

[0078] In the fifth embodiment of the first embodiment, the central region 11 of each magnet pocket 10 is configured without a bridge web. A single pocket cooling passage 15 is formed in the central region 11 of each magnet pocket 10, by which the magnet pocket 10 is filled with a filler material 17 through 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 without the filler material 17 in a portion cross-section smaller than the cross-section of the central region 11, for example by a release tool that can be removed afterward.

[0079] As a result, the pocket cooling passage 15 formed thereby is surrounded by and sealed by the packing material 17. The central region 11 of the magnetic pocket 10 is created in the shape of, for example, a triangle or a trapezoid.

Claims

1. A rotor (1) for a permanent magnet-excited synchronous machine, comprising a rotor shaft (3) rotatable about a rotor axis (2), and a rotor body (4) disposed on the rotor shaft (3) and configured as a rotor plate stack including a number of laminated plates (5), wherein a shaft cooling passage (13) extends into the rotor shaft (3), the rotor body (4) has a plurality of rotor poles (6) each having a pole center (7), and a plurality of the rotor poles (6) are provided with at least one V-shaped, C-shaped, or arc-shaped magnet pocket (10) each having a plurality of permanent magnets (9), each of which has a magnet-free central region (11) between two of the permanent magnets (9), and two magnet-free edge regions (12) on the short side (9s) of the permanent magnet (9) opposite to the central region (11), Each of the magnet pockets (10) is characterized by having at least one pocket cooling passage (15) formed within it, which is fluidly connected to the shaft cooling passage (13) and intended for cooling at least one of the permanent magnets (9) in the magnet pocket (10). In rotor (1), Each of the aforementioned pocket cooling passages (15) has a pocket passage inlet (15e) for supplying cooling fluid from the shaft cooling passage (13) and a pocket passage outlet (15a) for discharging cooling fluid. a. The pocket passage inlet (15e) of the pocket cooling passage (15) of the first group (14.1) is formed on one of the two end faces, b. The pocket passage inlet (15e) of the second group (14.2) of the pocket cooling passage (15) is formed on the other end face of the rotor (1) to generate opposite throughflow of the pocket cooling passage (15) in both groups (14.1, 14.2), The pocket cooling passages (15) of the first group (14.1) are located on the rotor poles (6) of the first group, and the pocket cooling passages (15) of the second group (14.2) are located on the rotor poles (6) of the second group, or the pocket cooling passages (15) of the first group (14.1) are formed by pocket cooling passages (15) located in the central region (11), and the pocket cooling passages (15) of the second group (14.2) are formed by pocket cooling passages (15) located in the edge region (12), The rotor body (4) has one cover disc (25.1, 25.2) on each of the two end faces, the first cover disc (25.1) has a first connecting passage (26.1) formed therein to the pocket passage inlet (15e) of the pocket cooling passage (15) of the first group (14.1), and the second cover disc (25.2) has a second connecting passage (26.2) formed therein to the pocket passage inlet (15e) of the pocket cooling passage (15) of the second group (14.2). a. The first and second connecting passages (26.1, 26.2) of both cover discs (25.1, 25.2) are fluidly connected to the shaft cooling passage (13), or b. The first connecting passage (26.1) is fluidly connected to the shaft cooling passage (13), and the second connecting passage (26.2) is fluidly connected to the pocket passage outlet (15a) of the pocket cooling passage (15) of the first group (14.1). Each of the pocket passage outlets (15a) is flow-connected to a collection passage (27) of one of the cover discs (25.1, 25.2), and each of the collection passages (27) of the cover discs (25.1, 25.2) has an outlet opening (28) which may be located on the end face or outer circumference of each of the cover discs (25.1, 25.2), or which opens into the recirculation area of ​​the shaft cooling passage (13). Each of the aforementioned collection passages (27) is fluidly connected to a plurality of pocket passage outlets (15a) of rotor poles (6) where the pocket cooling passages (15) have different radial positions with respect to the rotor shaft (2), and the collection passages (27) of the cover discs (25.1, 25.2) extend radially inward with respect to the rotor shaft (2) from each of the pocket passage outlets (15a) toward the outlet openings (28). A rotor (1) characterized by the following features.

2. Each of the aforementioned pocket cooling passages (15) is a. In the central region (11) of each of the magnet pockets (10), or in one of the edge regions (12) of each of the magnet pockets (10), b. A feature characterized by being formed in one of the notches (16) of the permanent magnet (9), or between the two notches (16) of two of the permanent magnets (9), The rotor (1) according to claim 1.

3. Each of the aforementioned magnet pockets (10) is filled with a curable filler material (17) for the attachment of the permanent magnet (9). Each of the pocket cooling passages (15) is a hollow space formed within the packing material (17), or at the edge of the packing material (17), or directly separated outside the packing material (17) by the wall of each of the magnet pockets (10). The rotor (1) according to claim 1, characterized in that

4. The rotor (1) according to claim 3, characterized in that the curable filler (17) is a sealing compound or a molding material.

5. The rotor (1) according to claim 3, characterized in that each of the pocket cooling passages (15) is formed by the subsequent demolding of the filling material (17) of each of the magnet pockets (10) with a tapered demolding tool.

6. The rotor according to claim 3, characterized in that each of the pocket cooling passages (15) is formed by a separate cooling pipe (18) embedded in the packing material (17).

7. The rotor (1) according to claim 3, characterized in that each of the pocket cooling passages (15) is formed between one of the short sides (9s) of each of the permanent magnets (9) and a tubular half-shell (19) embedded in the packing material (17) that abuts against the short side (9s) of the permanent magnet (9).

8. Two tube half-shells (19) are provided on the opposing short sides (9s) of each of the aforementioned permanent magnets (9). The permanent magnet (9) and both tube half-shells (19) are surrounded by an outer casing (20) to constitute a magnet unit. The rotor (1) according to claim 7, characterized in that

9. The rotor (1) according to claim 2, characterized in that the central region (11) of each of the magnet pockets (10) has a bridge web (22) or is configured without a bridge web.

10. The rotor (1) according to claim 9, characterized in that the central region (11) of each of the magnet pockets (10) is configured without a bridge web, the pocket cooling passage (15) formed in the central region (11) is formed by a hollow central region (11), and the pocket cooling passage (15) formed in the edge region (12) is formed by a hollow edge region (12).

11. The rotor (1) according to claim 10, characterized in that magnetically impermeable rod-shaped pocket bodies (23) are arranged in the hollow central region (11) and / or the hollow edge region (12) of each of the magnet pockets (10) to narrow the cross-section of the pocket cooling passage (15) formed in the central region (11) or the edge region (12).

12. The rotor (1) according to claim 11, wherein the magnetically impermeable rod-shaped pocket body (23) is made of plastic or elastomer.

13. The rotor (1) according to claim 1, characterized in that the rotor body (4) is surrounded by a rotor sleeve (24) in order to apply a preload to the outermost segment (6a) of the rotor body (4) toward the permanent magnet (9) of each of the magnet pockets (10).

14. The rotor according to claim 13, characterized in that the rotor sleeve (24) is a composite fiber sleeve.

15. The rotor (1) according to claim 13, characterized in that the rotor sleeve (24) extends axially beyond the rotor body (4) to annularly surround the two cover discs (25.1, 25.2) of the rotor (1) which are arranged on the end face side in the joining region (24.1), and a joining connection portion is provided between each of the joining regions (24.1) of the rotor sleeve (24) and each of the cover discs (25.1, 25.2).

16. An electric machine having the rotor (1) described in claim 1.

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