Stator core, stator assembly and motor

Abstract

The utility model relates to a stator core, a stator assembly comprising the stator core and a motor comprising the stator assembly. The stator iron core comprises a plurality of first lamination groups with oil flow channels, and is provided with a plurality of oil outlets arranged at the axial end part of the stator iron core; the plurality of second lamination groups are stacked in the axial direction of the first lamination group, each second lamination group is provided with a plurality of channel groups, and each channel group comprises at least two second channels which are through in the axial direction and is constructed to be gradually far away from the center of the second lamination group in the first circumferential direction of the second lamination group; every two adjacent second lamination groups are staggered by rotating at an angle in the first circumferential direction, so that at least part of the second channels of each second lamination group are in one-to-one correspondence in the same radial direction. The stator iron core is simple in structure, and the manufacturing cost is reduced under the condition that the cooling effect is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially is a kind of stator core, the stator assembly comprising the stator core and the motor comprising the stator assembly. BACKGROUND

[0002] In new energy vehicles, motor as the core component of power system has been widely used. Motor mainly includes stator and rotor, wherein the stator includes stator core and stator winding, and the rotor can include rotor shaft, rotor core and rotor winding (or permanent magnet). When current passes through stator winding, rotating magnetic field is generated in stator core, which interacts with magnetic field in rotor and then makes rotor assembly rotate, thereby converting electrical energy into mechanical energy. Since current passes through stator winding, a large amount of heat will be generated during operation of motor, so it is necessary to cool stator core, stator winding and the like of motor.

[0003] It is known in the prior art to use a plastic part with a seal and the stator itself to form a closed oil cavity. This increases the material cost of design and the process cost of assembly, and also increases additional failures due to defects in the parts themselves and defects in assembly. SUMMARY

[0004] The utility model aims at solving at least one of the above problems and / or other problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, according to one aspect of the utility model, a kind of stator core is provided, the stator core includes multiple first lamination groups arranged in layers, and multiple second lamination groups respectively stacked on one or both sides of the first lamination group in the axial direction. The multiple first lamination groups are formed with oil flow channel, and have multiple oil outlets arranged at one or both axial end portions thereof;Each of the second lamination groups is provided with multiple groups of channels, and each group of channels includes at least two second channels respectively penetrating in the axial direction, and the at least two second channels are configured to gradually move away from the central axis of the second lamination group along the first circumferential direction of the second lamination group. Wherein, adjacent two second lamination groups are arranged with a rotation angle in the first circumferential direction, so that at least part of the second channels of each second lamination group one by one correspond in the same radial direction, and part of the corresponding second channels can be communicated and configured as cooling channels for cooling medium to gradually flow to the center of the corresponding axial end portion of the stator core, and the cooling channels are communicated with the oil flow channel.

[0006] According to an embodiment of the present application, the second channel close to the radial outer side of the second lamination group of the plurality of first lamination groups is communicated with the oil outlet, and the second channels of the remaining second lamination groups communicated with the second channel gradually approach the central axis of the second lamination group in the direction away from the plurality of first lamination groups.

[0007] According to an embodiment of the present application, the oil flow channel comprises a plurality of first channels arranged at intervals along the circumference of the first lamination group, and the first channels of the first lamination group adjacent to the second lamination group form the oil outlet communicated with the second channel.

[0008] According to an embodiment of the present application, a rib is arranged between the two adjacent first channels, and the two adjacent first lamination groups are overlapped with an angle, so that the rib of each first lamination group corresponds to the first channel of the adjacent first lamination group.

[0009] According to an embodiment of the present application, the outer circumferential surface of at least one first lamination group is provided with an oil inlet communicated with the first channel.

[0010] According to an embodiment of the present application, each first lamination group is provided with a plurality of first weld seams distributed along the circumference thereof, and the corresponding first weld seams of the plurality of first lamination groups are axially aligned.

[0011] According to an embodiment of the present application, each second lamination group is provided with a plurality of weld seam groups at intervals, each weld seam group comprises a plurality of second weld seams arranged at intervals, and the corresponding second weld seam of each second lamination group is axially aligned with the corresponding first weld seam.

[0012] According to an embodiment of the present application, the first lamination group comprises a plurality of first laminations arranged in layers, and a plurality of arc-shaped holes are arranged at intervals in the first outer circumferential section of each first lamination.

[0013] According to an embodiment of the present application, the second lamination group comprises at least one second lamination arranged in layers, and a plurality of cooling medium flow holes are arranged at intervals in the second outer circumferential section of each second lamination, and each group of cooling medium flow holes comprises a plurality of cooling medium flow holes arranged at intervals and gradually away from the center of the second lamination in the first circumferential direction.

[0014] According to an embodiment of the present application, the outer diameter of the second lamination group is smaller than the outer diameter of the first lamination group.

[0015] According to another aspect of the present application, a stator assembly is provided, which comprises a stator core according to the above and a stator winding wound on the stator core, axial end portions of the stator winding extending beyond axial end portions of the stator core, and a cooling medium flowing out through second channels on the radially inner side of the second lamination sets opposite the first lamination sets and falling onto the axial end portions of the stator winding.

[0016] According to still another aspect of the present application, an electric machine is provided, which comprises a stator core or a stator assembly according to the above.

[0017] Compared with the prior art in which an oil passage is formed by adding additional components together with the stator core, the stator core of the present application forms an oil passage with a predetermined flow track on the lamination sets, so that the cooling medium can continuously contact the stator core through the oil flow channels of the first lamination sets and the second channels of the second lamination sets, enhancing heat conduction and improving cooling efficiency. Moreover, the second lamination sets are arranged staggered in the first circumferential direction, so that the second channels on different circumferences can be arranged one by one in the same radial direction, so that one of the second channels of each channel set can correspondingly communicate with the second channels of the adjacent second lamination sets in the same radial position, thereby forming an oil flow direction inclined towards the axial end portion of the stator winding. The continuous cooling of the stator core and the stator winding can be achieved without the aid of any additional components. BRIEF DESCRIPTION OF DRAWINGS

[0018] The features and advantages of the present application will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings provided only by way of illustration, wherein:

[0019] Figure 1 A perspective view of a stator core according to one exemplary embodiment of the present application is shown.

[0020] Figure 2 A perspective view of a stator core according to one exemplary embodiment of the present application is shown. Figure 1 A perspective view of a stator core according to one exemplary embodiment of the present application is shown.

[0021] Figure 3 A perspective view of a stator core according to one exemplary embodiment of the present application is shown. Figure 2 A perspective view of a stator core according to one exemplary embodiment of the present application is shown.

[0022] Figure 4 A perspective view of a stator core according to one exemplary embodiment of the present application is shown. Figure 2 A perspective view of a stator core according to one exemplary embodiment of the present application is shown.

[0023] Figure 5 A perspective view of a stator core according to one exemplary embodiment of the present application is shown. Figure 2The stator core shown is a cross-sectional view along line CC.

[0024] Figure 6 Showing the composition Figure 1 A schematic diagram of the first lamination of the first lamination group of the stator core is shown.

[0025] Figure 7 Showing the composition Figure 1 A schematic diagram of the second lamination of the second lamination group of the stator core.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. First lamination group; 11. Oil flow channel; 111. First channel; 12. Oil outlet; 13. Oil inlet; 14. Rib; 15. First weld; 2. Second lamination group; 21. Channel group; 211. Second channel; 2111. Second far channel; 2112. Second middle channel; 2113. Second near channel; 22. Weld group; 221. Second weld; 3. First lamination; 31. First outer peripheral section; 311. Arc-shaped hole; 312. First slot; 313. Opening; 32. First toothed section; 4. Second lamination; 41. Second outer peripheral section; 411. Cooling medium flow hole; 412. Second slot; 42. Second toothed section; H. First circumferential direction. Detailed Implementation

[0028] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to enable those skilled in the art to more fully understand and implement the present invention. However, it will be apparent to those skilled in the art that implementations of the present invention may not include some of these specific details. Furthermore, it should be understood that the present invention is not limited to the specific embodiments described. Rather, the present invention can be conceived to be implemented with any combination of the features and elements described below, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are for illustrative purposes only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims.

[0029] The terms "first" and "second" are used below to describe the elements of this application. These terms are used only to distinguish the individual elements and not to limit the nature, order, or number of these elements. The terms "comprising" and "having" are used to indicate an open-ended inclusion and mean that there may be additional elements / components besides those listed.

[0030] Figures 1-7 A stator core according to one embodiment of the present invention is shown. For example... Figure 1As shown, the stator core according to this embodiment includes a first lamination group 1 and an axial first side stacked on the first lamination group 1. Figure 1 Multiple second stacks 2 (on the upper side of the first stack 1 shown) and axial second sides stacked on the first stack 1 ( Figure 1 Multiple second stacked sheets 2 (below the first stacked sheet group 1 shown).

[0031] Figures 2 to 5 The partial structure of the stator core of this embodiment is shown more clearly, especially the part located in Figure 1 The diagram shows multiple second stacked laminations 2 on the axial first side of multiple first stacked laminations 1, and a portion of the first stacked laminations 1. See the specific embodiment described below. Figure 3 Multiple first lamination groups 1 form an oil flow channel 11, and multiple oil outlets 12 communicating with the oil flow channel 11 are provided at both ends in the axial direction, and multiple oil inlets 13 communicating with the oil flow channel 11 are provided on their outer peripheral surface.

[0032] like Figure 1 and Figure 2 As shown, each second stack 2 is provided with a plurality of channel groups 21 spaced apart (preferably equally spaced), and each channel group 21 may include at least two second channels 211 that extend along the axial direction. Figures 3 to 5 This illustrates that three second lamination groups 2 are provided at one axial end of a plurality of first lamination groups 1. For ease of description, the following will be... Figures 3 to 5 The three second stacked sheet groups 2 shown are respectively referred to as the left second stacked sheet group 2, the middle second stacked sheet group 2, and the right second stacked sheet group 2. Each corresponding channel group 21 may include three or more second channels 211 located on three different circumferences. Along Figure 2 Viewed from the first circumferential direction H of the second lamination group 2 shown, the three second channels 211 are arranged at equal intervals. Viewed radially from the second lamination group 2 shown, the three second channels 211 gradually move away from the central axis of the second lamination group 2. Therefore, for ease of description below, the three second channels 211 can be referred to as the second far channel 2111, the second middle channel 2112, and the second far channel 2113, respectively, according to their distance from the central axis of the second lamination group 2. The number of channel groups 21 can be set according to actual needs and can be selected to be equally spaced, thus allowing all the second channels 211 arranged in the circumferential direction of the second lamination group 2 to be equally spaced.

[0033] Figures 3 to 5 The cross-section shown is along Figure 2 Cross sections made in different radial directions of the second stack 2 in the middle, along Figures 3 to 5 The second stack 2 shown is viewed away from the multiple first stacks 1. Figure 3The radial direction shown includes a second distal channel 2111 on the right side of the second lamination group 2, a second middle channel 2112 in the middle of the second lamination group 2, and a second proximal channel 2113 on the left side of the second lamination group 2. The second distal channel 2111 on the right side is connected to the oil flow channel 11 via the oil outlet 12. The cross-section of the second middle channel 2112 in the middle of the second lamination group 2 partially coincides with the cross-section of the second distal channel 2111 on the right side, and partially coincides with the cross-section of the second proximal channel 2113 on the left side. Thus, when two adjacent second lamination groups 2 are rotated and staggered by an angle in the first circumferential direction H, the three second channels 211 in that radial position can be partially connected, forming a cooling channel for the cooling medium to gradually flow obliquely towards the center of the corresponding axial end of the stator core.

[0034] As an optional implementation, the number of channel groups 21 and the number and position of the second channels 211 contained in each channel group can be set as needed. For example, the multiple channel groups 21 do not have to be equally spaced, but can be set in a non-uniform form. The number of second channels in each channel group 21 can also be different from the number of second channels in other channel groups, as long as it is possible to form inclined oil flow channels between different second lamination groups 2.

[0035] Figure 4 It shows the relationship with Figure 3 The diagram shows different radial positions. At these radial positions are the second near channel 2113 of the second lamination group 2 on the right, the second far channel 2111 of the second lamination group 2 in the middle, and the second middle channel 2112 of the second lamination group 2 on the left. Although the cross-sections of the middle second far channel 2111 and the left second middle channel 2112 may overlap, the second near channel 2111 on the right is not connected to the oil flow channel 11; therefore, this radial position does not form a cooling channel.

[0036] same, Figure 5 It shows the relationship with Figure 3 and Figure 4 Each of these is located at a different radial position. At this radial position are the second middle channel 2112 of the right second lamination group 2, the second near channel 2113 of the middle second lamination group 2, and the second far channel 2111 of the left second lamination group 2. Because there is no oil outlet 12 at this position, and the middle second near channel 2113 and the left second far channel 2111 do not overlap, no cooling channel is formed at this radial position.

[0037] Figure 3Also shown are two first lamination stacks 1 stacked on the right side of the three second lamination stacks 2. As a preferred embodiment, the oil flow channel 11 of each first lamination stack 1 can include a plurality of first channels 111 arranged at intervals along the circumference thereof, with a rib 14 provided between adjacent two first channels 111. The width of the rib 14 in the circumferential direction of the first lamination stack 1 is less than the width of the first channel 111, so that when the adjacent two first lamination stacks 1 are stacked with a rotation of an angle, the rib 14 of the first lamination stack 1 on the right side corresponds to the first channel 111 of the first lamination stack 1 on the left side, and the first channel 111 of the first lamination stack 1 on the right side corresponds to the rib 14 of the first lamination stack 1 on the left side, as shown in Figure 4 so that the first channels 111 of the adjacent two first lamination stacks 1 can be staggered in communication to form the oil flow channel, so that the flow path of the oil flow channel 11 can be lengthened in the outer circumference of the plurality of first lamination stacks 1, so as to improve the cooling efficiency.

[0038] As a preferred embodiment, Figure 3 the diameter of the circumference where the center of the first channel 111 is located in the first lamination stack 1 is greater than the diameter of the circumference where the center of the second far channel 2111 (i.e. the radially outer second channel 211) of the second lamination stack 2 is located, and preferably the width in the radial direction is substantially equal, so that the cross section of the second far channel 2111 and the cross section of the first channel 2111 can be partially staggered with each other. The second far channel 2111 of the second lamination stack 2 on the right side corresponds to the first channel 111 of the first lamination stack 1 on the left side, so as to be in communication with the oil outlet 12. However, at the radial position shown in Figure 4 , the solid part of the second lamination stack 2 on the right side corresponds to the first channel 111 of the first lamination stack 1 on the left side, so that the first channel 111 at this position is closed by the solid part of the second lamination stack 2 and cannot be communicated with the oil outlet 12. At the radial position shown in Figure 5 , the second lamination stack 2 on the right side corresponds to the rib 14 of the first lamination stack 1 on the left side.

[0039] As an optional embodiment, as can be seen from Figure 3 , the outer diameter of the second lamination stack 2 is less than the outer diameter of the first lamination stack 1.

[0040] Figure 1 Also shown is that the outer circumferential surface of each first lamination stack 1 is provided with an oil inlet 13, and when the plurality of first lamination stacks 1 are arranged with a rotation of an angle, the plurality of oil inlets 13 are also arranged with a rotation of an angle. Thus, the cooling medium can enter the oil flow channel 11 simultaneously through the oil inlets 13 at different positions.

[0041] Figure 4An oil inlet 13 at this radial position is also shown. The width of the oil inlet 13 in the circumferential direction of the first lamination group 1 is greater than the width of the rib 14, thereby allowing it to cross the corresponding rib 14 and communicate with the two first channels 111 on both sides of the rib 14. It is understood that the width of the oil inlet 13 in the circumferential direction of the first lamination group 1 can be set according to actual needs, and can be set across more than one rib 14, or corresponding to the first channel 111.

[0042] In order to weld multiple first-layer laminations 1 into a single unit, such as Figure 1 As shown, each first lamination group 1 has multiple first welds 15 spaced apart along its circumference. When two adjacent first lamination groups 1 are stacked at a rotational angle, the corresponding first welds 15 of the two first lamination groups 1 can be aligned.

[0043] To weld multiple second lamination groups 2 and multiple first lamination groups 1 into a single unit, each second lamination group 2 may also be provided with multiple weld seam groups 22 spaced apart. Each weld seam group may include multiple spaced second weld seams 221, such as... Figure 2 As shown. In this embodiment, three second lamination groups 2 are provided at one axial end of the first lamination group 1, so that the weld group 22 of each second lamination group 2 may include three second welds 221. Thus, when the second lamination group 2 is rotated by an angle, a corresponding second weld 221 can be aligned with the first weld 15 and connected to form an axially continuous weld across the entire stator core.

[0044] According to one embodiment of the first stack group 1, the first stack group 1 may include a plurality of first stacked sheets 3 arranged in a stacked manner, such as Figure 6 As shown. The first stack 3 may include a first outer peripheral segment 31 in the shape of a ring, and a plurality of first toothed segments 32 extending radially inward from the first outer peripheral segment 31. At the outer end portion of the first outer peripheral segment 31 of each first stack 1, a plurality of preferably arc-shaped holes 311, a plurality of first slots 312, and an opening 313 are provided at intervals. The plurality of arc-shaped holes 311 are equally spaced along the entire circumferential portion of the first outer peripheral segment 31. The plurality of first slots 312 are equally spaced and recessed inward along the outer periphery of the first outer peripheral segment 31. At corresponding positions, the arc-shaped holes 311, being near their outer ends, can partially recess inward to avoid the first slots 312, forming irregular holes, thereby isolating the first slots 312 from the corresponding arc-shaped holes 311. The opening 313 is provided corresponding to two adjacent arc-shaped holes 311, thereby communicating with these two arc-shaped holes respectively. When multiple first laminations 3 are aligned and stacked to form a first lamination group 1, the arc-shaped holes 311 are stacked to form a first channel 111, the solid parts between two adjacent arc-shaped holes 311 are stacked to form a rib 14, the first slot 312 is stacked to form a first weld 15, and the opening 313 is stacked to form an oil inlet 13.

[0045] According to one embodiment of the second lamination stack 2, as shown in Figure 7 each second lamination stack 2 can include one or more second laminations 4 arranged in a stack. The second lamination 4 can include a second outer circumferential section 41 in a ring shape, and a plurality of second tooth sections 42 extending radially inwardly from the second outer circumferential section 41. A plurality of sets of cooling medium flow holes 411 and a plurality of sets of second slits 412 are arranged at intervals at an outer end portion of the second outer circumferential section 41. Each set of cooling medium flow holes 411 can include three cooling medium flow holes 411 arranged at intervals and gradually diverging from the center of the second lamination 4 in a first circumferential direction H, thereby enabling the three cooling medium flow holes 411 to be located on a circle with gradually expanding diameter, as shown in Figure 7 Each set of second slits 412 can include three second slits 411, thereby enabling the three cooling medium flow holes 411 to be aligned and stacked to form a second far channel 2111, a second middle channel 2112, and a second near channel 2113, respectively, when at least one second lamination 4 is aligned and stacked to form a second lamination stack, as shown in Figure 6 Figure 3 It can be understood that the number of second channels 211 varies depending on the number of second laminations 4 stacked to form the second lamination stack 2, thereby enabling the number of cooling medium flow holes 411 to vary and be adapted to the number of second laminations 2 and the number of second channels 211.

[0046] The utility model further provides a kind of stator assembly comprising above-mentioned stator core and the stator winding of being wound on the stator core, the axial end portion of stator winding extends the axial end portion of corresponding stator core, cooling medium is ejected and falls to the axial end portion of the stator winding via the second channel 211 (that is, second near channel 2113) of the radial inner side of the second lamination stack 2 away from the first lamination stack 1.

[0047] The utility model further provides a kind of motor comprising above-mentioned stator core or stator assembly.

[0048] ​Compared with the prior art in which an oil passage is formed by adding additional components together with the stator core, the stator core of the embodiment forms an oil passage with a predetermined flow track on the lamination stack itself, so that the cooling medium can continuously contact the stator core when passing through the oil passage formed by the oil flow channels 11 of the first lamination stack 1 and the second channels 211 of the second lamination stack 2, thereby enhancing heat conduction and improving cooling efficiency. Moreover, the plurality of second lamination stacks 2 are arranged staggered in the first circumferential direction H, so that at least part of the second channels 211 located on different circumferences can be arranged one by one in the same radial direction, so that one of the second channels 211 of at least one channel group 21 of one lamination stack 2 can correspondingly communicate with the second channels 211 of the adjacent second lamination stack 2 in the same radial position, thereby forming an oil flow direction inclined towards the axial end of the stator winding, and the continuous cooling of the stator core and the stator winding can be achieved without the help of any additional components. The entire stator core can be formed only by the two different specifications of the first lamination 3 and the second lamination 4, so that the material management is greatly simplified, and the material cost and process cost are saved.

[0049] Various modifications and variations to the disclosed embodiments of the present application can be made without departing from the scope or spirit of the application. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are intended as illustrative only and are not intended to limit the true scope of the present application.

Claims

1. A stator core, characterized in that, The stator core includes: A plurality of first lamination groups (1), the plurality of first lamination groups forming an oil flow channel (11) and having a plurality of oil outlets (12) arranged at one or two axial ends thereof; and Multiple second stacked sheets (2) are stacked on one or both sides of the first stacked sheet group (1) along the axial direction. Each second stacked sheet group is provided with multiple channel groups (21). Each channel group includes at least two second channels (211) that are axially connected. The at least two second channels are configured to gradually move away from the center of the second stacked sheet group along the first circumferential direction (H). In this arrangement, two adjacent second lamination groups (2) are rotated at an angle in the first circumferential direction to stagger them so that at least a portion of the second channels (211) of each second lamination group correspond one-to-one in the same radial direction, and a portion of the corresponding second channels are connected and configured to form a cooling channel for the cooling medium to gradually flow towards the center of the corresponding axial end of the stator core, the cooling channel being connected to the oil flow channel (11).

2. The stator core according to claim 1, characterized in that, The second channel (211) of the second stack near the radial outer side of the plurality of first stacks is connected to the oil outlet (12), and the second channels of the remaining second stacks connected to the second channel gradually approach the central axis of the second stack (2) in a direction away from the plurality of first stacks (1).

3. The stator core according to claim 2, characterized in that, The oil flow channel (11) includes a plurality of first channels (111) arranged circumferentially along the first lamination group (1), and the first channel of the first lamination group adjacent to the second lamination group forms an oil outlet (12) communicating with the second channel.

4. The stator core according to claim 3, characterized in that, Ribs (14) are provided between two adjacent first channels (111), and two adjacent first stacks (1) are rotated at an angle and stacked separately, so that the ribs (14) of each first stack correspond to the first channels of the adjacent first stack.

5. The stator core according to claim 3, characterized in that, At least one of the first stacked plates (1) has an oil inlet (13) on its outer peripheral surface that communicates with the first channel (111).

6. The stator core according to claim 1, characterized in that, Each of the first laminations (1) is provided with a plurality of first welds (15) distributed along its circumference, and the corresponding first welds of the plurality of first laminations are aligned in the axial direction.

7. The stator core according to claim 6, characterized in that, Each second lamination group (2) is provided with multiple sets of weld seam groups (22) at intervals, and each set of weld seam groups includes multiple second weld seams (221) arranged at intervals. The corresponding second weld seam (221) of each second lamination group is aligned axially with the corresponding first weld seam (15).

8. The stator core according to any one of claims 1 to 7, characterized in that, The first stacked sheet group (1) includes a plurality of stacked first sheets (3), and each first sheet has a plurality of arc-shaped holes (311) spaced apart on its first outer peripheral segment (31); and / or The second stack (2) includes one or more second stacks (4), and each second stack has a second outer peripheral segment (41) with a plurality of sets of cooling medium flow holes (411) spaced apart. Each set of cooling medium flow holes includes a plurality of cooling medium flow holes spaced apart and gradually moving away from the center of the second stack in the first circumferential direction (H).

9. The stator core according to any one of claims 1 to 7, characterized in that, The outer diameter of the second stack (2) is smaller than the outer diameter of the first stack (1).

10. A stator assembly, characterized in that, Includes a stator core according to any one of claims 1 to 9, and a stator winding wound on the stator core, wherein the axial end of the stator winding extends beyond the axial end of the corresponding stator core, and the cooling medium flows out through a second channel (211) on the radially inner side of the second lamination group opposite to the first lamination group and falls onto the axial end of the stator winding.

11. An electric motor, characterized in that, Includes the stator assembly as described in claim 10.

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