Stator for an electrical machine to be arranged horizontally

Abstract

The invention relates to a stator (1) for an electric machine which is to be arranged horizontally, comprising a stator housing (2) in which a stator main body (3) made up of a plurality of stacked stator laminations is arranged, wherein in the stator main body (3) a plurality of longitudinal channels (4), distributed over the circumference, are provided for guiding cooling fluid to an electric winding which is to be attached on the stator main body (3), wherein at least one collection channel (5) which partially or completely extends in a transverse plane is provided for the cooling fluid, said collection channel being fluidically connected to at least two longitudinal channels (4) and extending over at least part of the circumference, wherein the collection channel (5) has outlet openings (7) which are at least partially oriented in the longitudinal direction (6).

Description

[0001] Stator for a horizontally arranged electrical machine

[0002] The invention relates to a stator for a horizontally arranged electrical machine, with a stator housing in which a stator base body stacked from a plurality of stator laminations is arranged, wherein in the stator base body there are a plurality of longitudinal channels distributed over the circumference for conducting cooling fluid, such as a liquid, e.g. oil, to an electrical winding to be attached to the stator base body, in particular for cooling a winding head of the winding, wherein there is at least one collecting channel for the cooling fluid which runs partially or completely in a transverse plane, ie a plane to which the longitudinal axis of the stator is exactly at right angles, and which is in fluid communication with at least two longitudinal channels and extends over at least part of the circumference.

[0003] Against this background, stators for an electrical machine are known in which the stator is evenly cooled by cooling channels distributed longitudinally and around the circumference. Various implementation options are available for cooling other elements of the stator, for example using an open cooling circuit. In an open cooling circuit, the idea is to wet one winding head or both winding heads of the winding with the fluid after they exit the cooling channels, so that the fluid sprays onto the winding head or heads. However, when the electrical machine is installed horizontally with an open cooling circuit, there is the problem that the lower area of ​​the winding head is not hit by the fluid due to the force of gravity acting on the fluid as it exits the cooling channels. This results in reduced cooling of the winding head.

[0004] The object of the present invention is to provide a stator that enables optimized cooling of the stator and the winding heads.

[0005] This is achieved in a generic stator by providing the collecting channel with outlet openings that are at least partially aligned in the longitudinal / axial direction. This ensures that the winding heads can be sprayed for cooling. The collecting channel allows the cooling fluid, which is distributed among the longitudinal channels around the circumference, to be completely collected again in a single channel. This enables optimal overall utilization of the cooling fluid. The outlet openings, which are at least partially aligned in the longitudinal direction, allow for targeted wetting of the winding heads to ensure optimized cooling.

[0006] Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

[0007] It is advantageous if the outlet openings are limited to a section in the circumferential direction. This restricts the positions of the outlet openings, so that the cooling fluid can only flow out of the collecting channel in a predefined section. Overall, the cooling fluid is completely collected in the collecting channel, meaning that the cooling fluid flowing from the longitudinal channels into the collecting channel can then be used to cool the winding head and the winding. Because the outflow of the cooling fluid is limited to a section in the circumferential direction, the flow direction is predefined, as the cooling fluid can only flow out at a specific section. This ensures optimized utilization of the cooling fluid overall, since the restriction of the positions of the outlet openings ensures that the entire cooling fluid can be used for cooling. It should be noted here:

[0008] Furthermore, the outlet openings can be limited in the circumferential direction to an upper region in the direction of gravity along a transverse plane. In the horizontally arranged electrical machine, an upper region and a lower region are provided in the vertical direction, which is aligned along the direction of gravity, and which are spatially separated from one another by the transverse plane. The transverse plane is aligned perpendicular to the direction of gravity. Preferably, the outlet openings are subdivided in the circumferential direction into subsections, wherein each subsection can have a different number of outlet openings. The flow direction of the cooling fluid in the collecting channel is thus predetermined in a vertical upward direction (opposite to the direction of gravity).Preferably, first and second sections are provided, wherein the number of outlet openings along the circumferential direction can preferably decrease / reduce as the transverse plane is approached. Since outlet openings are omitted in the region located below the transverse plane, no cooling fluid can flow out of the collecting channel in this section.

[0009] In other words, the outlet openings are circumferentially limited to a section according to the definition of a clock, from 9 o'clock to 3 o'clock. No outlet openings are arranged in the section from 3 o'clock to 9 o'clock, since fluid jets from outlet openings in this section do not result in wetting of the winding head, as the fluid jets flow / drip past the winding head.

[0010] It is advantageous if the outlet openings are formed on the base of the stator body or in the stator housing on the stator housing side. If the outlet openings are formed on the base of the stator body, they are preferably incorporated in a stator lamination arranged axially at the end and in the form of a cover lamination or a collecting lamination. This allows for a flexible design of the stator. Preferably, a single stator lamination or a plurality of stator laminations of this type can be provided. If a plurality of stator laminations of this type are provided, they can be stacked one on top of the other in the longitudinal direction. This offers the advantage that tolerances between the stator housing and the stator lamination stack can be compensated.

[0011] Preferably, the outlet openings can be through-holes in at least partial or complete axial direction in a stator lamination arranged axially at the end, or can be radial recesses / milled out portions on an inner side / inner wall / inner surface of the stator housing. These radial recesses can form an axial channel which is in fluid communication with the collecting channel. This enables a flexible design of the stator. Preferably, the recess has a rounded / smooth or a sharp / stepped transition to the inner side of the stator housing on a side facing away from the collecting channel. Alternatively, the recesses distributed in the circumferential direction can also have different transitions from one another, so that some of the recesses have a rounded transition and others have a sharp / stepped transition.Preferably, the recesses where the cooling fluid arrives with more pressure have the sharp transition, and the recesses where the cooling fluid arrives with less pressure have the rounded transition.

[0012] It is expedient for the stator to have first outlet openings on a first axial end and second outlet openings on a second axial end. To cool both winding heads, arranging the outlet openings on both sides is advantageous. Furthermore, this allows for a symmetrical stator shape.

[0013] In addition, the collecting channel can be formed on the base side of the stator body or on the stator housing side in the stator housing. If the collecting channel is formed on the base side of the stator body, it can be formed using at least the stator lamination / collecting lamination that is separate from or integrated into the stator lamination stack. The stator lamination can be formed in several parts, preferably in two parts. This allows for flexible design and assembly of the stator lamination. The stator lamination can have an axially extending notch / recess / embossing that extends at least over part of the circumference and allows cooling fluid to collect. Alternatively, the collecting channel can be formed using two distributor laminations arranged adjacent in the longitudinal direction, each forming a stator lamination, wherein both distributor laminations each have axial openings, wherein these openings are offset from one another in the circumferential direction by half a stator slot.This allows a collecting channel to be formed that runs meandering in the circumferential direction. The two distribution plates can be formed integrally or separately from the stator core. If the collecting channel is formed in the stator housing on the stator housing side, it can have at least one collecting channel extending over part of the circumference / the circumferential direction.

[0014] It can be a groove / notch / recess. Preferably, the collecting channel can extend completely in the circumferential direction in order to maintain fluid communication with the longitudinal channels distributed over the circumference. The advantage of a collecting channel formed in the stator housing is that, due to its integration into the stator housing, no axial overhang is necessary, thus maintaining the installation space.

[0015] It is particularly advantageous if the stator base body has inlet openings distributed over the circumference in the form of an inlet channel each, which are in fluid connection with the longitudinal channels.

[0016] Particularly preferably, the inlet openings can be formed in an inlet plate forming a stator lamination, wherein the inlet plate has circumferentially distributed and spaced-apart openings / recesses, preferably extending outward in the radial direction, wherein the recesses penetrate an outer side of the stator lamination in the radial direction. The openings then each form an inlet channel. These openings can be arranged in the assembly of the stator lamination stack in the circumferential direction so as to coincide with the longitudinal channels. Preferably, the stator lamination with the inlet channels can be arranged centrally in the longitudinal direction in the stator lamination stack in order to enable the cooling fluid to flow towards the first axial end side and the second axial end side. In this way, a completely symmetrical shape of the stator can be implemented.Overall, a particularly compact design of the stator lamination stack is implemented, since the inlet channels are formed by the arrangement of the stator laminations in the radial direction.

[0017] It is advantageous if the stator housing has a circumferential groove for introducing the cooling fluid, wherein the groove is axially aligned congruently with the inlet channels. This allows the cooling fluid to flow circumferentially into the inlet groove and, via a fluid connection with the inlet channels, flow radially inward into them, guiding the cooling fluid through the stator base body.

[0018] In an advantageous embodiment, a respective first transition channel can be formed in the fluid flow direction between the longitudinal channel and the collecting channel, wherein the transition channel can be formed in the radial direction or axially offset from the longitudinal channel. The transition channel enables flow from the longitudinal channels into the collecting channel, whereby the longitudinal channels are each connected to the collecting channel via a transition channel. Preferably, the transition channel is formed in a transition plate arranged in the stator laminated core and forming a stator plate. Particularly preferably, the stator plate can have recesses / openings distributed in the circumferential direction and evenly spaced from one another in a radially outer region of the stator plate, preferably extending outwards in the radial direction, which penetrate an outer side of the stator plate.This enables a particularly compact design of the stator lamination stack, as the transition channel is formed by the arrangement of the stator laminations within the stator lamination stack, allowing the cooling fluid to flow outward in a radial direction. If the transition channel is offset axially from the longitudinal channels, the cooling fluid can flow further axially through a narrowed opening formed jointly by the longitudinal channel and the transition channel. Alternatively, the transition plate can be shaped like the inlet plate, so that these two stator laminations have an identical shape.

[0019] It is expedient if, in the fluid flow direction, a further, second transition channel is formed in the radial direction between the collecting channel and the outlet openings. The second transition channel can connect the collecting channel and the outlet openings to one another. The second transition channel is preferably formed in a second transition plate arranged in the stator laminated core and forming a stator laminate. Particularly preferably, the stator laminate can have, in a radially outer region of the stator laminate, recesses / openings that delimit the upper region in the circumferential direction and are distributed and spaced from one another, preferably extending outwards in the radial direction and penetrating an outer side of the stator laminate. These recesses can be arranged congruently with the outlet openings in the circumferential direction when the stator laminated core is assembled.This enables a particularly compact design of the stator lamination stack, as the transition channel is formed by the arrangement of the stator laminations within the stator lamination stack. Overall, this allows the cooling fluid to flow from the radial outside to the radial inside, then flow out through the outlet openings and wet the winding heads. Alternatively, the second transition plate described here can be replaced by the first transition plate described above. The circumferentially distributed openings, which are not arranged opposite an outlet opening, can form a blind hole with a stator lamination adjacent to this transition plate.

[0020] It is advantageous if the individual stator laminations are bonded together to form the stator lamination stack, particularly with a bonding varnish, or glued together. This ensures a particularly dense arrangement of the individual stator laminations.

[0021] It is advisable to secure the stator lamination stack radially within the stator housing using a transverse interference fit. This enables a particularly optimized seal, eliminating gaps through which the cooling fluid could accidentally leak out. Alternatively, the stator lamination stack can be secured with some clearance relative to the stator housing.

[0022] It is advantageous if the previously described stator laminations in the form of the inlet lamination, the stator lamination with longitudinal channels, the separating lamination, the respective transition laminations, and / or the cover lamination form a longitudinally stacked partial lamination stack. The axial length of the respective partial lamination stacks is flexible depending on the design of the stator base body. The axial length of the partial lamination stack can be varied depending on the stator design.

[0023] The invention also relates to a horizontally arranged electrical machine with a rotor and a previously described stator.

[0024] In other words, the invention relates to optimized winding head cooling in a stator core. The primary goal is to combine the circumferentially distributed longitudinal channels / cooling channels to convey the cooling fluid upwards again in a vertical direction. The cooling fluid is sprayed out of the upper side of the stator through fewer openings, with the lower openings removed. The sprayed cooling fluid falls down on its own, so that the lower region of the winding head is also cooled. In a first embodiment, first and second transition channels and outlet openings allow the cooling fluid to be sprayed out only via the upper openings on the cover plate.

[0025] In a second embodiment, stator laminations with second transition channels are omitted, while axial channels in the stator housing in the form of milled recesses serve as openings for winding head cooling.

[0026] In a third embodiment, the cover plate has openings along its entire circumference that are to be joined together. For this purpose, two stator laminations are stacked on top of each other, with the two laminations rotated relative to each other by half a stator slot. The two stator laminations have cutouts, and the rotated installation creates a collecting channel.

[0027] In a fourth embodiment, embossings are introduced into an end sheet, which forms a collecting channel / connecting channel.

[0028] Various advantageous embodiments of the invention are explained in more detail below with reference to a drawing with figures.

[0029] They show:

[0030] Fig. 1 shows a stator according to the invention of a first embodiment in a sectional view,

[0031] Fig. 2 shows a stator according to the invention in a second embodiment in a sectional view,

[0032] Fig. 3 shows the stator according to the invention according to Fig. 2 with different shaped outlet openings,

[0033] Fig. 4 an inlet plate in a front view, Fig. 5 a stator plate with longitudinal channels in a front view,

[0034] Fig. 6 a first transition plate in a front view,

[0035] Fig. 7 a second transition plate in a front view,

[0036] Fig. 8 a cover plate in a front view,

[0037] Fig. 9 shows a stator according to the invention in a third embodiment in a sectional view,

[0038] Fig. 10 a cooling fluid path in the stator according to Fig. 9,

[0039] Fig. 11 a stator according to the invention in a fourth embodiment in a sectional view

[0040] Fig. 12 the stator according to Fig. 12 in a perspective view.

[0041] The figures are merely schematic and serve solely to facilitate understanding of the invention. The same elements are provided with the same reference numerals. Features of the individual embodiments can be interchanged and used alternatively / cumulatively.

[0042] Fig. 1 shows a stator 1 according to the invention for a horizontally arranged electrical machine (not shown here), with a stator housing 2 in which a stator base body 3 stacked from a plurality of stator laminations is arranged, wherein the stator base body 3 has a plurality of longitudinal channels 4 distributed over the circumference for conducting cooling fluid to an electrical winding (not shown here) to be attached to the stator base body 4, wherein there is at least one collecting channel 5 for the cooling fluid, which runs partially or completely in a transverse plane, is in fluid communication with at least two longitudinal channels 4 and extends over at least part of the circumference. It should be emphasized that the collecting channel 5 has outlet openings 7 aligned at least partially in the longitudinal direction 6.

[0043] The longitudinal direction 6 extends in an axial direction 8. A radial direction 9 is defined perpendicular to the axial direction 8. The direction along the circumference of the stator 1 is a circumferential direction 10.

[0044] The following figures show, among other things, a total of four different embodiments of the stator 1 according to the invention, which are illustrated and explained below. The stator base body 3 has stator laminations of differently designed ones due to the structure using stator laminations stacked in the longitudinal direction 6. The stator 1 is designed symmetrically, so that a central transverse plane in the longitudinal direction 6 reflects the plane of symmetry. The stator 1 has a first axial end side 11 and a second axial end side 12, wherein from the central transverse plane to the respective end side 11, 12, the respective stator sides / stator halves are designed identically. With regard to the following description, the focus is on the first axial end side 11.

[0045] The present stator laminations have a basic shape typical for a stator 1, with a plurality of stator slots 13 and stator teeth 14 distributed in the circumferential direction 10 and evenly spaced from one another. If a stator lamination has a shape different from this typical configuration, this is described.

[0046] Fig. 1 shows a first embodiment of the stator 1 according to the invention in a perspective sectional view. A stator sheet in the form of an inlet sheet 15 is positioned centrally in the longitudinal direction 6 of the stator base body 3. The inlet sheet 15 has radial openings 16 / inlet openings that are positioned evenly spaced from one another in the circumferential direction 10 of the inlet sheet 15. These openings 16 allow the cooling fluid to flow in and thus each form an inlet channel 30 in the radial direction 9. At this point, reference is made to Fig. 4, which shows the inlet sheet 15 in a single view from the front. In the axial direction 8, toward the first axial end side 11, a stator sheet 17 with the longitudinal channels 4 is arranged on the inlet sheet 15. The stator sheet 17 has a greater extension in the axial direction 8 than the inlet sheet 15.A total of two stator laminations 17 with longitudinal channels 4 are arranged one behind the other in the axial direction 8.

[0047] In the axial direction 8 in the direction of the first axial end side 11, a stator lamination in the form of a first transition lamination 18 with transition channels 19 is arranged on the two stator laminations 17, wherein the first transition lamination 18 has openings 20 introduced in the radial direction 9, whereby the cooling fluid transitions from an axial flow direction via the transition channels 19 into a radial flow direction. For the specific design of the first transition lamination 18, reference is made to Fig. 5. The transition lamination 18 is arranged relative to the stator lamination 17 with longitudinal channels 4 in such a way that the opening in the transition from the longitudinal channel 4 to the transition channel 19 is smaller than the cross section of the longitudinal channel 4. The flow velocity is thus increased at this point. Overall, the cross section of the transition channel 19 is also smaller than the longitudinal channel 4.

[0048] In the axial direction 8 in the direction of the first axial end side 11, a stator plate in the form of a separating plate 21 is arranged on the first transition plate 18. In the axial direction 8 in the direction of the first axial end side 11, a second transition plate 22 is arranged on the separating plate 21. The second transition plate 22 also has transition channels 23, in the form of openings 24 introduced in the radial direction 9, wherein the transition channels 23 are limited to an upper region (see Fig. 6) in the direction of gravity. The second transition plate 22 has a greater axial extent than the first transition plate 18, whereby the cross-section of the second transition channel 23 is enlarged. This slows down the flow velocity of the cooling fluid. The separating plate 21 serves to axially shield the two transition plates 18, 22 so that no cooling fluid can flow in the axial direction 8 directly from the first transition channel 18 into the second transition channel 23.A stator lamination in the form of a cover lamination 25 is arranged at the axial end of the second transition lamination 22. The cover lamination 25 has the outlet openings 7a integrated therein, wherein the outlet openings 7 are configured in the form of axial through-holes. The outlet openings 7 are limited to a section 26 extending in the circumferential direction 10 above the transverse plane. Reference is made to Fig. 7 for the specific configuration of the cover lamination 25. The outlet openings 7a are formed on the first axial end 11, and the outlet openings 7b are formed on the second axial end 12.

[0049] The stator housing 2 has a first groove 27 on the input side of the inlet plate 15, which is formed circumferentially on an inner side 28 of the stator housing 2. The axial width of the groove 27 is greater than the thickness of the inlet plate 15. The groove 27 extends in the axial direction 8, at least in part, to the stator plate 17 with the longitudinal channels 4.

[0050] The stator housing 2 has a second groove 29, spaced apart from the first groove 27 in the axial direction 8, which is formed circumferentially on an inner side 28 of the stator housing 2. In the axial direction 8, the second groove 29 is aligned in the region of the first transition plate 18, the separating plate 21, and the second transition plate 22. The second groove 29 has a width in the axial direction 8 that is designed such that it extends in the axial direction 8 over the two openings 20, 24 in the form of the transition channels 19, 23, thus creating an axial overhang. This is a tolerance compensation so that the stator housing 2 cannot close off any of the openings 20, 24 during assembly. This second groove 29 is the previously described collecting channel 5. Thus, the transition channels 19 of the first transition plate 18 are in fluid communication with the collecting channel 5. Furthermore, the collecting channel 5 is in fluid communication with the second transition channels 23 of the second transition plate 22.

[0051] The cooling fluid thus flows inward in the radial direction 9 via the first groove 27 into the inlet channels 30, while it then flows in the axial direction 8 through the longitudinal channels 4 of the stator laminations 17, and then flows outward in the radial direction 9 via the first transition channel 19 into the collecting channel 5. The entire cooling fluid, which previously flowed through the individual longitudinal channels 4 of the stator laminations 17, is collected in the collecting channel 5. The cooling fluid then flows inward in the radial direction 9 via the transition channels 23 to the outlet openings 7, where it flows out through the axial through-holes. The cover plate 25 has a sufficient axial height, whereby the transition channels 23 are sealed by a transverse interference fit of the outer diameter of the cover plate 25. Thus, the entire fluid flows through the openings 7a. The specific course is visualized using the cooling fluid path 31.

[0052] Figs. 2 and 3 show the second embodiment of the stator 1 according to the invention. This is similar to the design of the first embodiment, which is why only the specific differences in structure and function will be discussed here. Fig. 2 shows the structure of the stator 1 according to the invention, while Figs. 3a and 3b show the cooling fluid path 31. Compared to the first embodiment, the two stator laminations 17 with longitudinal channels 4 in the axial direction 8 have a different extension, and therefore a different thickness, from one another. In comparison, the thickness of one stator lamination 16 is many times greater than the thickness of the other stator lamination 16.

[0053] In comparison to the first embodiment, the second embodiment only has a first transition plate 18 with transition channels 19. Thus, the separating plate 21 is also omitted in this embodiment. The outlet openings 7 are here introduced into the inner side 28 of the stator housing 2 instead of into the cover plate 25. The outlet openings 7 are formed by means of radial recesses on the inner side 28. The recesses are adjacent to the second groove 29 in the axial direction 8 and connected to this groove 29 in the axial direction 8, so that the cooling fluid flows out via the collecting channel 5 directly via the outlet openings 7. The recesses have an elongated shape in the axial direction 8. The recesses are shown in two different embodiments. In Figs. 2 and 3a, the recess has a rounded transition 32 to the inner side 28 of the stator housing 2 on the side facing away from the collecting channel 5. In Fig.3b, the recess has a sharp / stepped transition 33 on the side facing away from the collecting channel 5. The design of the recess can be combined, so that some of the recesses have a rounded transition 32 in the circumferential direction, and some of the recesses have a sharp transition 33. The fluid jets can thus be optimally designed. As shown, the uppermost recesses (approximately 12 o'clock position) can have the stepped transition 33 to limit the fluid jet. Other recesses (e.g., 10 o'clock position and 2 o'clock position) can have the rounded transition 32 to have less influence on the fluid jet.

[0054] Figures 4 to 8 show individual views of some of the various stator laminations. The stator laminations are divided into radially outer and radially inner regions. The radially inner regions comprise the stator teeth 14 and stator slots 13, while the radially outer region defines the stator yoke 34.

[0055] Fig. 4 shows a front view of the inlet plate 15. The radial openings 16 have a shape that decreases / narrows inward in the radial direction 9. The openings 16 partially extend into the stator tooth 14. The openings 16 are distributed in the circumferential direction 10 and positioned at equal distances from one another.

[0056] Fig. 5 shows a front view of the stator lamination 17 with the longitudinal channels 4. The longitudinal channels 4 are distributed in the circumferential direction 10 and positioned at equal distances from one another. The longitudinal channels 4 extend partially radially inward into the stator teeth 14.

[0057] Fig. 6 shows a front view of the first transition plate 18. The radial openings 20 extend from the radial outside to the radial inside. The radial openings 20 are limited to the stator yoke 34, i.e., the radially outer region.

[0058] Fig. 7 shows a front view of the second transition plate 22. The radial openings 24 have a shape comparable to the radial openings 20 described in Fig. 6, but the radial openings 24 are limited to the section 26 in the circumferential direction 10. The openings 24 are formed in subsections 35, 36 with varying frequencies in the circumferential direction 10. A total of ten openings 24 are positioned in a first subsection 35, wherein these openings are arranged in groups of two openings 24 each in the circumferential direction 10. Consequently, five groups of two openings 24 each are arranged on this subsection 35.

[0059] Arranged in the circumferential direction 10 on both sides of the first subsection 35 are two second subsections 36, each of which has two openings 24. These openings 24 are spaced further apart from one another in the circumferential direction than the openings 24 are spaced apart from one another in the first subsection 35. This arrangement allows the cooling fluid to flow out of the collecting channel 5 only from specific areas.

[0060] Fig. 8 shows a front view of the cover plate 25. The cover plate 25 has the outlet openings 7 in the form of axial through holes. The positioning of the outlet openings 7 in the circumferential direction 10 corresponds to the arrangement of the openings 24 of the second transition plate 22, which is described and referenced in Fig. 7.

[0061] Figures 9 and 10 show a third embodiment of the stator 1 according to the invention. Figure 9 shows the structure of the stator 1 according to the invention, while Figure 10 shows the cooling fluid path 31.

[0062] Compared to the first and second embodiments, the stator 1 has a collecting channel 5 on the base of the stator body. The basic structure of the stator laminations is identical according to the second embodiment, with the inlet plate 15 and the two stator laminations 17 having longitudinal channels 4. The transition plate 18 with an axial transition channel 19 is arranged toward the axial end 11 on the second stator plate 17. The axial transition channel 19 is offset from the longitudinal channel 4 in the radial direction 9. This reduces the opening for flow between the longitudinal channel 4 and the transition channel 19. Positioned toward the axial end 11 on the transition plate 18 is the cover plate 25, which in the present embodiment has openings 37 distributed over the circumference. The openings 37 have a smaller cross-section than the cross-section of the transition channel 19.

[0063] In the direction of the axial end side 11, two distributor plates 38, 39, a first distributor plate 38 and a second distributor plate 39, are positioned on the cover plate 25 in the axial direction 8. The distributor plates 38, 39 are annular in design and do not have a design comparable to the stator plates in terms of stator slots 13 and stator teeth 14. The two distributor plates 38, 39 have axial through-openings 40 formed over the circumference of the respective distributor plates 38, 39. The two distributor plates 38, 39 are aligned with respect to one another in the circumferential direction 10 such that the through-openings 40 are offset from one another by half a stator slot 13. Thus, by means of the through-openings 40 and this offset arrangement, a meandering channel is formed, which in this embodiment is the collecting channel 5.

[0064] An annular end plate 41 is arranged at the axial end of the second distributor plate 39. This end plate 41 has the outlet openings 7, which are limited in the circumferential direction 10 to the section 26. The outlet openings 7 are axial through holes, the arrangement of which corresponds to the configuration of the first embodiment.

[0065] Fig. 10 shows the cooling fluid path 31 of the cooling fluid. The cooling fluid flows in the axial direction 8 through the transition channel 19 through the openings 37 in the cover plate 25. The cooling fluid then flows over the two distributor plates 38, 39 in a meandering fashion in the circumferential direction 10 and continues in the axial direction 8 through the outlet openings 7 in the end plate 41, which are limited to the section.

[0066] 11 and 12 show a fourth embodiment. Fig. 12 shows a section of a sectional view of the fourth embodiment of the stator 1 according to the invention. In comparison to the third embodiment, a collecting plate 42 is arranged instead of the two distributor plates 38, 39 and the end plate 41. The collecting plate 42 is in this case made up of several parts, consisting of two halves 43, 44. On the side aligned with the cover plate 25, the collecting plate 42 has an embossed portion / notch 45 running in the circumferential direction 10 and extending in the axial direction 8, which forms the collecting channel 5. The collecting channel 5 is in fluid communication with the transition channels 19, which here are also formed in the axial direction 8 according to the third embodiment. The collecting plate 42 has the outlet openings 7 on the section 26, which extend partly axially and partly radially, i.e. at an angle of approximately 45°.

[0067] Fig. 12 shows the two-part structure of the collecting plate 42. The first half 43, which is arranged in the upper area according to the previously described definition, overlaps the second half 44 with a section at each of its end sides.

[0068] The stator laminations described individually above can be designed as a partial laminated core stacked in the longitudinal direction.

[0069] List of reference symbols

[0070] Stator Stator housing Stator body Longitudinal channel Collecting channel Longitudinal direction Outlet openings Axial direction Radial direction Circumferential direction First axial end side Second axial end side Stator groove Stator tooth Inlet plate Radial opening Stator plate First transition plate Transition channel Radial openings Separating plate Second transition plate Transition channel Radial openings Cover plate Section First groove Inside side Second groove Inlet channel Cooling fluid path Rounded transition Stepped transition

[0071] Stator yoke first section second section

[0072] Openings first distributor plate second distributor plate axial through openings

[0073] End plate

[0074] Collecting plate first half of the collecting plate second half of the collecting plate notch

Claims

Patent claims 1. Stator (1) for a horizontally arranged electrical machine, comprising a stator housing (2) in which a stator base body (3) stacked from a plurality of stator laminations is arranged, wherein the stator base body (3) has a plurality of longitudinal channels (4) distributed over the circumference for conducting cooling fluid to an electrical winding to be attached to the stator base body (3), wherein there is at least one collecting channel (5) for the cooling fluid, which runs partially or completely in a transverse plane, is in fluid communication with at least two longitudinal channels (4) and extends over at least part of the circumference, characterized in that the collecting channel (5) has outlet openings (7) aligned at least partially in the longitudinal direction (6).

2. Stator (1) according to claim 1, characterized in that the outlet openings (7) are limited to a section (26) in the circumferential direction (10).

3. Stator (1) according to claim 1 or 2, characterized in that the outlet openings (7) are limited in the circumferential direction (10) to an upper region in the direction of gravity according to a transverse plane.

4. Stator (1) according to one of claims 1 to 3, characterized in that the outlet openings (7) are formed on the stator body base side or are formed on the stator housing side in the stator housing (2).

5. Stator (1) according to one of claims 1 to 4, characterized in that the outlet openings (7) are in at least partial or complete axial direction (8) in a stator sheet arranged axially at the end or are radial recesses on an inner side (28) of the stator housing (2).

6. Stator (1) according to one of the preceding claims, characterized in that the stator (1) has at a first axial end side (11) first Outlet openings (7a) and second outlet openings (7b) on a second axial end side (12).

7. Stator (1) according to one of the preceding claims, characterized in that the stator base body (3) has inlet openings distributed over the circumference in the form of an inlet channel (30) each, which are in fluid connection with the longitudinal channels (4).

8. Stator (1) according to claim 7, characterized in that the stator housing (2) has a groove (27) extending in the circumferential direction (10) for introducing the cooling fluid, wherein the groove (27) is aligned in the axial direction (8) congruent with the inlet channels (30).

9. Stator (1) according to one of the preceding claims, characterized in that a transition channel (19) is formed in the fluid flow direction between the longitudinal channel (4) and the collecting channel (5), wherein the transition channel (19) is formed in the radial direction (9) or axially offset to the longitudinal channel (4).

10. Stator (1) according to claim 9, characterized in that in the fluid flow direction between the collecting channel (5) and the outlet openings (7) a further transition channel (23) is formed in the radial direction (9).

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