Oil cooling stator and motor

Abstract

The invention relates to an oil cooling stator and a motor. The oil-cooled stator comprises a stator core and a winding. The winding is arranged on the stator iron core, and two ends of the winding are exposed out of two end faces of the stator iron core in the axial direction. A fluid channel, a liquid inlet channel and a liquid outlet channel are arranged in the stator core, wherein the liquid inlet channel and the liquid outlet channel are communicated with the fluid channel. A plurality of protruding parts and a plurality of groove parts are arranged in the stator iron core, and the protruding parts are configured to prevent the groove parts from being directly communicated in the circumferential direction of the stator iron core and prevent the groove parts from being directly communicated in the axial direction of the stator iron core. And the plurality of groove parts are distributed in the stator iron core in a staggered manner. Wherein every two staggered adjacent groove parts are communicated through a connecting channel formed between every two staggered adjacent protruding parts, and the multiple groove parts are sequentially communicated to form a fluid channel. The fluid channel extends in a zigzag mode. According to the oil-cooled stator and the motor provided by the invention, the heat dissipation performance can be improved, and the manufacturing difficulty and the production cost of the motor can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and particularly to an oil-cooled stator and a motor. Background Art

[0002] The reliability and advancement of the motor heat dissipation design are the keys to ensuring the service life and operating efficiency of the motor. The stator of the motor includes a stator core and a coil winding. When the motor is operating, both the stator core and the coil winding will generate a large amount of heat. In the prior art, when oil-cooling the stator, it is usually necessary to direct the cooling oil to the stator core and the coil winding through components such as oil pipes or oil rings, which makes the structure of the stator complex and the cost high. Moreover, due to the addition of external components such as oil pipes or oil rings, the heat dissipation performance is also affected.

[0003] In view of this, it is necessary to propose a new technical solution to overcome the deficiencies of the prior art. Summary of the Invention

[0004] Based on this, the present application provides an oil-cooled stator and a motor, which can improve the heat dissipation performance and reduce the manufacturing difficulty and production cost of the motor.

[0005] To this end, the present application adopts the following technical solution: An oil-cooled stator includes a stator core and a winding. The winding is disposed on the stator core, and both ends of the winding are exposed on the two end faces of the stator core in the axial direction. A fluid channel, an inlet channel communicating with the fluid channel, and an outlet channel are provided in the stator core. A plurality of protruding portions and a plurality of groove portions are provided in the stator core. The protruding portions are configured to prevent the plurality of groove portions from directly communicating in the circumferential direction of the stator core and from directly communicating in the axial direction of the stator core. The plurality of groove portions are arranged in a staggered manner in the stator core. Among them, two adjacent groove portions in the staggered position are communicated by a connection channel formed between two adjacent protruding portions in the staggered position. The plurality of groove portions are sequentially communicated to form the fluid channel, and the fluid channel extends in a zigzag manner.

[0006] In some embodiments, in the circumferential direction of the stator core, three adjacent groove portions in the staggered position are arranged in a "pin" shape.

[0007] In some embodiments, the stator core includes a plurality of core units stacked along its axial direction. Each core unit includes a plurality of through grooves spaced apart in the circumferential direction. The through grooves penetrate through the two ends of the core unit in the axial direction. The through grooves form the groove portions, and the connecting ribs between adjacent through grooves form the protruding portions.

[0008] In some embodiments, the circumferential side of the through groove is closed.

[0009] In some embodiments, the core unit includes a plurality of lugs, each of which is provided with a liquid inlet hole, wherein the plurality of core units have the same structure, and each of the core units has liquid inlet holes of more than two structures, and the structures of the two liquid inlet holes connected along the axial direction of two adjacent core units are different, and several of the liquid inlet holes are connected to form the liquid inlet channel, and the inner end of the liquid inlet channel is connected to the fluid channel.

[0010] In some of the embodiments, each of the core units is formed by stacking a plurality of first stator sheets.

[0011] In some embodiments, the oil-cooled stator includes a plurality of second stator punching sheets stacked along its axial direction, the second stator punching sheets cover the through slots, each of the second stator punching sheets is provided with a through hole, and the through holes are connected to form the liquid outlet channel.

[0012] In some embodiments, the plurality of second stator punching sheets are stacked together so that the through holes are connected in sequence in an offset manner to form an obliquely extending liquid outlet channel, and the inner end of the liquid outlet channel is connected to the through groove.

[0013] In some embodiments, the multiple second stator punches have the same structure, and each of the second stator punches has more than two types of through holes, the through holes connected along the axial direction of two adjacent second stator punches have different structures, and several of the through holes are connected to form the liquid outlet channel.

[0014] The present application also adopts the following technical solution: an electric motor comprises a housing, a rotor and an oil-cooled stator as described in any of the above embodiments.

[0015] The oil-cooled stator provided in the present application forms a liquid inlet channel, a fluid channel and a liquid outlet channel by the structure of the stator core itself, and a plurality of protrusions and a plurality of grooves are provided in the stator core, and the protrusions are constructed to prevent the plurality of grooves from being directly connected in the circumferential direction of the stator core, and to prevent the plurality of grooves from being directly connected in the axial direction of the stator core, and the plurality of grooves are staggered in the stator core, wherein two adjacent staggered grooves are connected by a connecting channel formed between two adjacent staggered protrusions, and the plurality of grooves are connected in sequence to form the fluid channel, thereby achieving oil cooling of the stator core through the structure of the stator core itself, improving the heat dissipation performance, and eliminating the need for other components such as oil rings and oil pipes, thereby reducing production costs and motor manufacturing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a three-dimensional diagram of the stator core in one embodiment of the oil-cooled stator of the present application.

[0018] Figure 2 A partial cross-sectional view of a fluid channel in a stator core is shown for an embodiment of an oil-cooled stator of the present application.

[0019] Figure 3 A cross-sectional view of a liquid inlet passage is shown for an embodiment of an oil-cooled stator of the present application.

[0020] Figure 4 This is an exploded view of the stator core in one embodiment of the oil-cooled stator of the present application.

[0021] Figure 5 This is a three-dimensional diagram of the second stator punching sheet in an embodiment of the oil-cooled stator of the present application.

[0022] Figure 6 A cross-sectional view of a liquid channel is shown for an embodiment of an oil-cooled stator of the present application.

[0023] The reference numerals of the components are as follows:

[0024] 1. stator core; 101. core unit; 1010. through slot; 1011. connecting rib; 102. second stator punching sheet; 110. liquid inlet channel; 1101. first liquid inlet hole; 1102. second liquid inlet hole; 1103. third liquid inlet hole; 11. raised portion; 111. first raised portion; 112. second raised portion; 120. fluid channel; 12. groove portion; 121. first groove portion; 122. second groove portion; 123. connecting channel; 130. liquid outlet channel; 1301. through hole; 140. wire groove; 15. end face; 16. lug portion. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0026] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0030] See also Figures 1 to 6As shown, the present application provides an oil-cooled stator for use in a motor. The oil-cooled stator includes a stator core 1 and a winding (not shown), the winding is arranged on the stator core 1, and the two ends of the winding are exposed at the two end surfaces 15 of the stator core 1 in the axial direction. The structure of the stator core 1 itself forms a liquid inlet channel 110, a fluid channel 120 and a liquid outlet channel 130, and the fluid channel 120 is connected to both the liquid inlet channel 110 and the liquid outlet channel 130. The fluid channel 120 is configured to extend in a zigzag manner, and the cooling medium flows from the liquid inlet channel 110 into the interior of the stator core 1, flows in the circumferential direction of the stator core 1 as a whole in the fluid channel 120, and partially forms a liquid flow flowing toward the axial end surface 15 of the stator core 1 so that part of the cooling medium is sprayed toward the winding from the liquid outlet channel 130, thereby realizing oil cooling of the stator core 1 and the winding through the structure of the stator core 1 itself, improving the heat dissipation performance, and without the need for other components such as oil rings and oil pipes, thereby reducing the production cost and the difficulty of motor manufacturing.

[0031] See also Figure 1 As shown, in this embodiment, the stator core 1 is cylindrical in shape as a whole, and its axial direction is as follows Figure 1 As shown by the L line in the middle, its circumference is Figure 1 As shown by the R line in the middle. A plurality of wire grooves 140 are provided on the inner ring surface of the stator core 1 for installation of windings. The wire grooves 140 penetrate the two end surfaces 15 in the axial direction of the stator core 1, and the two ends of the windings are exposed at the end surfaces 15 in the axial direction of the stator core 1. The stator core 1 is provided with a liquid inlet channel 110 for inputting the cooling medium into the stator core 1, and a liquid outlet channel 130 for outputting the cooling medium from the stator core 1. In this embodiment, the liquid inlet channel 110 and the liquid outlet channel 130 are opened to the end surface 15; in other embodiments, the liquid inlet channel 110 and the liquid outlet channel 130 may also be opened on the peripheral side surface of the stator core 1.

[0032] See also Figure 2As shown, a fluid passage 120 for the cooling medium to flow through is provided inside the stator core 1. A plurality of protruding portions 11 and a plurality of groove portions 12 are provided in the stator core 1. The protruding portions 11 are configured to prevent the plurality of groove portions 12 from being directly communicated in the circumferential direction of the stator core 1 and from being directly communicated in the axial direction of the stator core 1. The plurality of groove portions 12 are arranged in a staggered manner in the stator core 1. Among them, two adjacent groove portions 12 in a staggered position are communicated by a connecting passage 123 formed between two adjacent protruding portions 11 in a staggered position. The plurality of groove portions 12 are sequentially communicated to form the fluid passage 120. With such an arrangement, when the cooling medium flows in the circumferential and axial directions, it will be blocked by the protruding portions 11 to distribute the cooling medium into the groove portions 12, so that the fluid passage 120 extends in a zigzag manner. The cooling medium flows in the circumferential direction of the stator core 1 as a whole in the fluid passage 120, and locally forms a liquid flow flowing toward the end faces 15 in the axial direction of the stator core 1, so that part of the cooling medium sprays out from the liquid outlet passage 130 toward both ends of the winding.

[0033] In this embodiment, the protruding portions 11 and the groove portions 12 are arranged alternately in the circumferential direction of the stator core 1. In the circumferential direction of the stator core 1, three adjacent groove portions 12 in a staggered position are arranged in a "pin" shape. More specifically, the protruding portion 11 includes a first protruding portion 111 and a second protruding portion 112. The first protruding portion 111 is disposed near the middle in the axial direction of the stator core 1, and the second protruding portion 112 is disposed near the two end faces 15 in the axial direction of the stator core 1. The groove portion 12 includes a first groove portion 121 and a second groove portion 122. The first groove portion 121 is disposed near the middle in the axial direction of the stator core 1, and the second groove portion 122 is disposed near the two end faces 15 in the axial direction of the stator core 1. In the axial direction of the stator core 1, the first protruding portion 111 and the second protruding portion 112 are arranged in a staggered manner, and the first groove portion 121 and the second groove portion 122 are arranged in a staggered manner. In this embodiment, along the axial direction of the stator core 1, from one end face 15 to the other end face 15, the protruding portion 11 and the groove portion 12 are arranged in sequence as the second groove portion 122, the first protruding portion 111, and the second groove portion 122, or are arranged in sequence as the second protruding portion 112, the first groove portion 121, and the second protruding portion 112. In other embodiments, the arrangement of the protruding portion and the groove portion is not limited to the above, and it can also continue to be repeatedly extended and arranged on the basis of the above arrangement.

[0034] Please continue to refer to Figure 2As shown, in the circumferential direction of the stator core 1, the length of the first protrusion 111 is smaller than the length of the second groove 122, and the length of the second protrusion 112 is smaller than the length of the first groove 121. In this way, the staggered grooves 12 are connected to each other. The flow of the cooling medium is as shown in FIG. Figure 2 As shown by the arrows in the figure, the cooling medium is input from the liquid inlet channel 110 to a position near the middle of the stator core 1, flows in the circumferential direction, encounters the obstruction of the first protrusion 111, and flows from the connecting channels 123 on both sides of the first protrusion 111 to the second grooves 122 on both sides of the first protrusion 111. The liquid flow flows toward the end face 15 of the stator core 1, so that part of the cooling medium can be sprayed toward the two ends of the winding from the liquid outlet channel 130 connected to the second groove 122; since the liquid outlet channel 130 is small, the liquid entering the second groove 122 Most of the cooling medium will continue to flow downstream, and the cooling medium in the second groove portion 122 will be blocked by the second protrusion 112 when flowing in the circumferential direction, and will flow from the connecting channel 123 between the second groove portion 122 and the adjacent downstream first protrusion 111 to the downstream first groove portion 121; in this way, the cooling medium will partially disperse from the middle to the two end surfaces 15, gather from the two end surfaces 15 to the middle, and disperse from the middle to the two end surfaces 15, and flow in such a tortuous manner repeatedly; and the cooling medium will flow in the fluid channel 120 along the circumferential direction of the stator core 1 as a whole. In this way, the cooling medium can fully contact with the stator core 1 to dissipate heat, and the cooling medium can be sprayed from the end surface 15 to dissipate heat to the winding. The width of the connecting channel 123 can be set according to actual needs to reasonably distribute the oil volume.

[0035] See also Figure 3 and Figure 4 As shown, the stator core 1 includes a plurality of core units 101 stacked along the axial direction thereof, each of the core units 101 includes a plurality of through slots 1010 spaced apart in the circumferential direction, and the through slots 1010 penetrate through both ends of the core unit 101 in the axial direction. The through slots 1010 form the groove portion 12, and the connecting ribs 1011 between adjacent through slots 1010 form the protrusion 11. In this embodiment, the circumferential side of the through slots 1010 is closed. That is, the through slots 1010 are not connected to the circumferential wall of the core unit 101, and the through slots 1010 are directly opened inside the core unit 101. Multiple core units 101 can be directly stacked to form the groove portion 12 and the fluid channel 120, without the need to provide an additional shell to enclose the fluid channel 120.

[0036] In this embodiment, the stator core 1 includes five core units 101. For the convenience of description, the stator core 1 is sequentially referred to as the first to fifth units from one end face 15 to the other end face 15. The through slots 1010 on the first and second units are directly connected and are offset from the through slots 1010 on the third unit. The through slots 1010 on the fourth and fifth units are directly connected and are offset from the through slots 1010 on the third unit. Thus, the following is formed: Figure 2 Of course, in other embodiments, the number of core units 101 included in the stator core 1 is not limited to 5, and may be other numbers; and the arrangement thereof is not limited to the above. Further, in some embodiments, each of the core units 101 may be formed by stacking a plurality of first stator punching sheets.

[0037] In this embodiment, each of the core units 101 is provided with a liquid inlet hole, and the liquid inlet holes on the multiple core units 101 are connected to form the liquid inlet channel 110. In this embodiment, the core unit 101 includes a plurality of lugs 16, and the lugs 16 are provided with the liquid inlet holes, wherein the multiple core units 101 have the same structure, and each of the core units 101 has liquid inlet holes of more than two structures, and the structures of the two liquid inlet holes connected along the axial direction of two adjacent core units 101 are different. Such an arrangement makes the multiple core units 101 have the same structure, and can be made by a set of molds, which can reduce the number of molds and reduce costs. During assembly, different core units 101 only need to be connected and stacked in the axial direction with liquid inlet holes of different structures. Among them, different structures refer to at least one parameter such as setting position, shape, quantity, etc. being different.

[0038] Specifically, each of the core units 101 includes three different structures of liquid inlet holes, namely, a first liquid inlet hole 1101, a second liquid inlet hole 1102 and a third liquid inlet hole 1103. The first liquid inlet hole 1101 is a half-moon-shaped through hole, the second liquid inlet hole 1102 is two long strip through holes that are not connected to the through slot 1010, and the third liquid inlet hole 1103 is two long strip through holes that are connected to the through slot 1010. When multiple core units 101 are stacked, the liquid inlet holes of different structures are axially connected. For example, in this embodiment, Figure 4 As shown, two adjacent core units 101 are stacked and connected in the axial direction with the first liquid inlet hole 1101 and the second liquid inlet hole 1102. It can be understood that other adjacent core units 101 may also be stacked and connected in the axial direction with the first liquid inlet hole 1101 and the third liquid inlet hole 1103, or the second liquid inlet hole 1102 and the third liquid inlet hole 1103.

[0039] This embodiment is described by taking three liquid inlets as an example. It is understandable that it is not limited to three, and it can be two or more. In addition, in other embodiments, the structures of the multiple core units 101 can be different, that is, each core unit 101 is provided with a liquid inlet, and the structure of the liquid inlet on each core unit 101 is different, so that the liquid inlet channel 110 can be formed when multiple core units 101 are stacked. This embodiment requires multiple sets of molds, and the assembly order of different core units 101 needs to be distinguished during assembly.

[0040] See also Figures 4 to 6 As shown, the oil-cooled stator includes a plurality of second stator punching sheets 102 stacked along the axial direction thereof, and the second stator punching sheets 102 are located at both ends of the plurality of stacked core units 101 in the axial direction. The second stator punching sheets 102 block the through slots 1010, and each of the second stator punching sheets 102 is provided with a through hole 1301, and the through holes 1301 are connected to form the liquid outlet channel 130. Figure 6 As shown, the plurality of second stator punching sheets 102 are stacked together so that the through holes 1301 are connected in sequence in an offset manner to form a liquid outlet channel 130 extending obliquely.

[0041] In this embodiment, the second stator punching sheet 102 is thinner than the core unit 101, and the thickness of multiple stacked second stator punching sheets 102 is also thinner than the core unit 101. The second stator punching sheet 102 mainly functions to block the through groove 1010 and form the liquid outlet channel 130 of the required injection path.

[0042] In this embodiment, the plurality of second stator punching sheets 102 have the same structure, and each of the second stator punching sheets 102 has two or more through holes 1301, and the through holes 1301 connected along the axial direction of two adjacent second stator punching sheets 102 have different structures, and a plurality of the through holes 1301 are connected to form the liquid outlet channel 130. The inner side end of the liquid outlet channel 130 is connected to the groove portion 12 formed by the through groove 1010.

[0043] Specifically, if Figure 5 As shown, each of the second stator punching sheets 102 has through holes 1301 arranged in sequence in regions A1 to A4, wherein two adjacent second stator punching sheets 102 are stacked in a 90° rotational misalignment, i.e., through hole 1 is opposite to through hole 2, through hole 2 is opposite to through hole 3, through hole 3 is opposite to through hole 4, and through hole 4 is opposite to through hole 1. It can be understood that different through holes 1301 on other adjacent second stator punching sheets 102 can also be stacked and connected in a manner of other angle misalignment.

[0044] See also Figure 6As shown, in this embodiment, eight second stator punching sheets 102 are arranged at each end surface 15 of the stator core 1. Through the above stacking method, the eight second stator punching sheets 102 are stacked and staggered to form a certain angle, forming at least one inclined through-flow liquid outlet channel 130, as shown in FIG. Figure 6 The inclined liquid outlet channel 130 can make the cooling medium spray out at an angle, so that the cooling medium is fully in contact with both ends of the winding exposed at the end surface 15, thereby improving the heat dissipation performance of the winding. The angle of inclination can be adjusted according to the use requirements.

[0045] The structures of the multiple second stator punching sheets 102 in this embodiment are the same, and each second stator punching sheet 102 is provided with two or more through holes 1301. In other embodiments, the structures of the multiple second stator punching sheets 102 may be different, that is, each second stator punching sheet 102 is provided with a through hole 1301, and the structures of the through holes 1301 on each second stator punching sheet 102 are different, so that the liquid outlet channel 130 can be formed when multiple second stator punching sheets 102 are stacked; this embodiment requires multiple sets of molds, and the assembly order of different second stator punching sheets 102 needs to be distinguished during assembly. Of course, in other embodiments, the number of second stator punching sheets 102 included in each end face 15 of the stator core 1 is not limited to 8, and it can also be other numbers.

[0046] The present application also provides a motor, comprising a housing, a rotor and an oil-cooled stator as described in any of the above embodiments. In one embodiment, the motor is a vehicle drive motor used in new energy vehicles.

[0047] From the above description of the specific embodiments, it can be known that the oil-cooled stator provided by the present application forms a liquid inlet channel 110, a fluid channel 120 and a liquid outlet channel 130 by the structure of the stator core 1 itself, and a plurality of protrusions 11 and a plurality of grooves 12 are provided in the stator core 1. The protrusions 11 are constructed to block the cooling medium so as to distribute the cooling medium to the grooves 12. The fluid channel 120 formed by the plurality of grooves 12 being connected to each other extends in a zigzag manner. The cooling medium flows along the circumferential direction of the stator core 1 as a whole in the fluid channel 120, and locally forms a liquid flow flowing toward the axial end face 15 of the stator core 1 so that part of the cooling medium is sprayed toward the winding from the liquid outlet channel 130, thereby realizing oil cooling and heat dissipation of the stator core 1 and the winding through the structure of the stator core 1 itself, thereby improving the heat dissipation performance, and requiring the use of other components such as oil rings and oil pipes, thereby reducing the production cost and difficulty of motor manufacturing.

[0048] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An oil-cooled stator, comprising a stator core and a winding, wherein the winding is arranged on the stator core, and both ends of the winding are exposed at both end surfaces of the stator core in the axial direction, characterized in that: A fluid channel, a liquid inlet channel communicating with the fluid channel, and a liquid outlet channel communicating with the fluid channel are provided in the stator core. A plurality of protruding portions and a plurality of groove portions are provided in the stator core. The protruding portions are configured to prevent the plurality of groove portions from directly communicating in the circumferential direction of the stator core and from directly communicating in the axial direction of the stator core. The plurality of groove portions are arranged in a staggered manner in the stator core. Among them, two adjacent groove portions in a staggered manner communicate through a connection channel formed between two adjacent protruding portions in a staggered manner. The plurality of groove portions are sequentially communicated to form the fluid channel, and the fluid channel extends in a zigzag manner.

2. The oil-cooled stator according to claim 1, characterized in that: In the circumferential direction of the stator core, three adjacent groove portions in a staggered manner are arranged in a "pin" shape.

3. The oil-cooled stator according to claim 1, characterized in that: The stator core includes a plurality of core units stacked along its axial direction. Each core unit includes a plurality of through grooves spaced apart in the circumferential direction. The through grooves penetrate through both ends of the core unit in the axial direction. The through grooves form the groove portions, and the connecting ribs between adjacent through grooves form the protruding portions.

4. The oil-cooled stator according to claim 3, characterized in that: The circumferential side of the through groove is closed.

5. The oil-cooled stator according to claim 3, characterized in that: The core unit includes a plurality of lug portions, and liquid inlet holes are formed in the lug portions. Among them, the structures of the plurality of core units are the same, and each core unit has more than two structures of liquid inlet holes. The structures of the liquid inlet holes communicating axially between two adjacent core units are different. A plurality of the liquid inlet holes are communicated to form the liquid inlet channel, and the inner end of the liquid inlet channel communicates with the fluid channel.

6. The oil-cooled stator according to any one of claims 3 to 5, characterized in that: Each core unit is stacked by a plurality of first stator punching sheets.

7. The oil-cooled stator according to claim 3, characterized in that: The oil-cooled stator includes a plurality of second stator punching sheets stacked along its axial direction. The second stator punching sheets cover the through grooves. Each second stator punching sheet is provided with a through hole, and the through holes are communicated to form the liquid outlet channel.

8. The oil-cooled stator according to claim 7, characterized in that: The plurality of second stator punching sheets are stacked together such that the through holes are sequentially communicated in a staggered manner to form a liquid outlet channel extending obliquely. The inner end of the liquid outlet channel communicates with the through groove.

9. The oil-cooled stator according to claim 8, characterized in that: The structures of the plurality of second stator punching sheets are the same, and each second stator punching sheet has more than two through holes. The structures of the through holes communicating axially between two adjacent second stator punching sheets are different. A plurality of the through holes are communicated to form the liquid outlet channel.

10. A motor, characterized in that: It includes a housing, a rotor, and the oil-cooled stator according to any one of claims 1 to 9.

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