Stator core, motor stator and motor

Abstract

The utility model provides a stator core, a motor stator and a motor, which belong to the technical field of electrical equipment, and comprise a main body part and a channel part which are adjacent to each other, the main body part and the channel part are sequentially arranged along the axis direction of the stator core, the channel part is provided with a radial channel extending along the radial direction of the stator core, and the radial channel extends along the radial direction of the stator core. The main body part is provided with an axial channel penetrating through the main body part along the axial direction of the stator iron core, the axial channel is communicated with the radial channel, and the outer diameter of at least part of the channel part is smaller than that of the main body part, so that a circumferential channel extending along the circumferential direction of the stator iron core is formed; the circumferential channel has a receiving opening facing the outside of the stator core. According to the utility model, baffle ring parts do not need to be arranged, additional structural features such as circumferential oil grooves do not need to be processed on the shell, the motor structure can be simplified, and the assembly difficulty of the motor can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a stator core, a motor stator, and a motor. Background Technology

[0002] The thermal load generated by an electric motor during operation directly affects its peak and continuous output performance and operational reliability. Therefore, motor temperature rise is a crucial indicator in motor design and use. Motor temperature rise is related to various heat-generating factors within the motor itself, as well as its cooling structure. A good, efficient, and simple cooling structure can not only reduce motor temperature rise and improve operational stability but also extend its service life. Currently, motor cooling methods commonly include air cooling, water cooling, and oil cooling. Compared to air and water cooling, oil has stronger thermal conductivity, and its contact and heat exchange with the heat-generating areas are more direct and efficient. Therefore, oil cooling is gradually becoming the mainstream trend for drive motor heat dissipation.

[0003] In some related technologies, a retaining ring is installed inside the motor, with a medium flow channel inside to allow the flow of heat exchange media such as cooling oil, thereby cooling components such as windings within the motor. In other related technologies, the retaining ring is eliminated, simplifying the axial flow characteristics and reducing the axial space occupied by the stator core. Eliminating the retaining ring requires adding structural features such as circumferential oil grooves to the inner wall of the housing, increasing the machining workload of the housing and causing difficulties in assembling the stator and housing. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a stator core, a motor stator and a motor, to solve the problems of complex structural features and difficult assembly in the existing technology.

[0005] To achieve the above and other related objectives, this utility model provides a stator core, comprising adjacent main body portions and channel portions, wherein the main body portions and the channel portions are arranged sequentially along the axial direction of the stator core.

[0006] The channel portion has a radial channel extending radially along the stator core, and the main body portion has an axial channel penetrating the main body portion along the axial direction of the stator core, the axial channel communicating with the radial channel.

[0007] The outer diameter of at least a portion of the channel portion is smaller than the outer diameter of the main body portion, so as to form a circumferential channel extending circumferentially along the stator core, the circumferential channel having a receiving opening facing outward from the stator core.

[0008] Optionally, the channel portion includes two or more channel laminations stacked sequentially along the axial direction of the stator core. Each channel lamination has a base portion and a protruding portion extending beyond the outer edge of the base portion. The outer diameter of the base portion is smaller than the outer diameter of the main body portion, and the projections of the protruding portions of adjacent channel laminations along the axial direction of the stator core do not intersect.

[0009] Optionally, the main body includes two or more main body laminations, each of which is stacked sequentially along the axial direction of the stator core. The main body laminations are annular, and the inner edge of each main body lamination has a toothed structure that protrudes radially inward along the main body lamination. A groove structure is formed between adjacent toothed structures. The included angle between the protruding directions of two adjacent protruding portions in the circumferential direction of the stator core is α, where α = 360n / s, n is greater than 1 and less than s / 3, n is a positive integer, and s is the number of toothed structures or groove structures.

[0010] Optionally, there are multiple radial channels, and each radial channel is evenly arranged around the axis of the stator core.

[0011] Optionally, there are multiple axial channels, and each axial channel is evenly arranged around the axis of the stator core.

[0012] Optionally, there are two main body portions, and the channel portion is located between the two main body portions, with the channel portion cooperating with the two main body portions to form the circumferential channel.

[0013] Optionally, the radial dimension of the protruding portion of the channel lamination is the same as the radial dimension of the main body.

[0014] Optionally, the main body includes two or more main body laminations, each of which is stacked sequentially along the axial direction of the stator core and bonded to each other.

[0015] Optionally, the outer edge of the channel lamination is provided with multiple channel notches, and the channel notches of each channel lamination are superimposed to form each radial channel, and each radial channel is provided in a one-to-one correspondence with each axial channel.

[0016] Optionally, each of the axial channels is connected to the circumferential channel through a corresponding radial channel.

[0017] Optionally, the main body includes two or more main body laminations stacked sequentially along the axial direction of the stator core. The main body laminations have channel holes, and the channel holes of each main body lamination are stacked to form the axial channel.

[0018] Optionally, the main body stamping is annular, and the inner edge of the main body stamping has a toothed structure that protrudes inward along the radial direction of the main body stamping. A groove structure is formed between adjacent toothed structures. In the radial direction of the main body stamping, the channel hole is disposed near the root of the toothed structure or the bottom of the groove structure relative to the outer edge of the main body stamping.

[0019] Optionally, the main body is provided with an end plate on one end away from the channel in the direction of the stator core axis. The end plate has an adjustment hole communicating with the axial channel. The adjustment hole is configured to adjust the flow direction and / or flow rate of the heat exchange medium flowing out from the axial channel.

[0020] This utility model also provides a motor stator, including a winding and a stator core as described in any of the above claims, wherein the winding is disposed on the stator core.

[0021] This utility model also provides an electric motor, including a housing and a motor stator as described above. The motor stator is disposed inside the housing, and a heat exchange medium opening is provided on the housing. The heat exchange medium opening is disposed corresponding to the circumferential channel and communicates with the circumferential channel.

[0022] As described above, the stator core, motor stator, and motor of this utility model have the following beneficial effects: Since at least part of the outer diameter of the channel portion of the stator core is smaller than the outer diameter of the main body portion, a circumferential channel extending circumferentially along the stator core can be formed. The circumferential channel has a receiving opening facing outward from the stator core, thereby receiving heat exchange medium such as cooling oil, and then conveying the heat exchange medium such as cooling oil along the circumferential direction of the stator core. There is no need to set up retaining ring parts, nor is it necessary to process additional structural features such as circumferential oil grooves on the housing, which is conducive to simplifying the structure of the motor and also helps to reduce the assembly difficulty of the motor. Attached Figure Description

[0023] Figure 1 The diagram shows a three-dimensional structural schematic of the stator core in an embodiment of this utility model.

[0024] Figure 2 The diagram shown is a structural schematic of the channel lamination in an embodiment of this utility model.

[0025] Figure 3 The diagram shown is a partially enlarged structural schematic of the channel lamination in an embodiment of this utility model.

[0026] Figure 4 The diagram shown is a structural schematic of the main body stamping in an embodiment of this utility model; the main body stamping

[0027] Figure 5 The diagram shows the cooperation between the main body stamping and the adjacent channel stamping in an embodiment of this utility model.

[0028] Figure 6 This is shown as a partially enlarged structural schematic diagram of the channel portion in one embodiment of this utility model;

[0029] Figure 7 The diagram shown is a partial enlarged structural schematic diagram of the channel portion in an embodiment of this utility model;

[0030] Figure 8 The diagram shows the flow of cooling oil in the circumferential channel in an embodiment of this utility model.

[0031] Figure 9 The diagram shown is a structural schematic of the shell in an embodiment of this utility model.

[0032] Figure 10 The diagram shows the flow of cooling oil in an embodiment of this utility model.

[0033] Explanation of reference numerals in the attached drawings: 1. Channel section; 2. Main body section; 4. Axial channel; 5. Radial channel; 7. Toothed structure; 8. Groove structure; 9. Circumferential channel; 10. Channel lamination; 11. Protruding part; 12. Base part; 13. Channel notch; 20. Main body lamination; 21. Channel hole; 30. Shell; 31. Heat exchange medium inlet; 40. Winding. Detailed Implementation

[0034] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0035] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components related to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex. The structures, proportions, sizes, etc., shown in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0036] Please see Figures 1 to 10 This embodiment provides a stator core, which includes a main body portion 2 and a channel portion 1 arranged adjacent to each other, with the main body portion 2 and the channel portion 1 arranged sequentially along the axial direction of the stator core. The channel portion 1 has a radial channel 5, and the main body portion 2 has an axial channel 4. The radial channel 5 extends radially along the stator core, and the axial channel 4 passes through the main body portion 2 along the axial direction of the stator core, communicating with the radial channel 5.

[0037] like Figure 6 and Figure 10 As shown, in this embodiment, the axis of the stator core is the axis of the motor stator, that is, the stator axis Z, which is also the rotation axis of the motor. At least a portion of the channel portion 1 has an outer diameter smaller than the outer diameter of the main body portion 2, forming a circumferential channel 9 extending circumferentially along the stator core. The circumferential channel 9 has a receiving opening facing outwards from the stator core to receive heat exchange media such as cooling oil from outside the stator core. The circumferential channel 9 communicates with the radial channel 5, allowing the heat exchange media to pass through the circumferential channel 9, then sequentially through the radial channel 5 and the axial channel 4, thereby exchanging heat with components such as the stator winding 40. The circumferential channel 9 extends circumferentially along the stator core, dispersing the received heat exchange media circumferentially, which is beneficial for uniform heat exchange on the motor stator and also facilitates alignment of the motor stator with heat exchange media inlets 31, such as cooling oil inlets, on the housing 30 during assembly, reducing assembly difficulty.

[0038] In this embodiment, the circumferential channel 9 is provided on the stator core, eliminating the need for additional structures such as circumferential oil grooves on the inner wall of the housing 30. This reduces the structural features of the inner wall of the housing 30, lowers the processing difficulty of the housing 30, and makes it easier to assemble the stator core and the housing 30.

[0039] In some specific optional embodiments, there is one main body 2 and one channel 1. One side of the channel 1 is the main body 2, and the other side is a retaining ring or other components. The retaining ring, the channel 1, and the main body 2 cooperate to form a groove-shaped circumferential channel 9, with the opening of the groove facing outward along the radial direction of the stator core. When the heat exchange medium is cooling oil, the circumferential channel 9 is a circumferential oil groove. Since the retaining ring component is only located on one side of the channel 1, compared to two retaining ring components, it is beneficial to simplify the axial flow characteristics and reduce the axial space occupied by the stator core.

[0040] like Figure 1 As shown, in this embodiment, there are two main body parts 2, and the channel part 1 is located between the two main body parts 2. The channel part 1 and the two main body parts 2 cooperate to form a groove-shaped circumferential channel 9. The opening of the groove faces outward along the radial direction of the stator core. The two main body parts 2 respectively form two side walls of the circumferential channel 9. The outer peripheral surface of the channel part 1 forms the bottom of the groove. The opening of the groove faces outward along the radial direction of the stator core. When the heat exchange medium is cooling oil, the circumferential channel 9 is a circumferential oil groove.

[0041] In this embodiment, the circumferential channel 9 is disposed on the surface of the stator core and surrounds the stator core, with the beginning and end connected. For example, when the motor stator is cooled, heat exchange medium such as cooling oil can flow in the circumferential channel 9 along the circumference of the stator core, which is beneficial to the uniform distribution of heat exchange medium.

[0042] like Figures 2-5 , Figures 6-8 As shown, in this embodiment, the channel portion 1 includes two or more channel laminations 10 stacked sequentially along the axial direction of the stator core. Each channel lamination 10 has a base portion 12 and a protruding portion 11 protruding from the outer edge of the base portion 12. The outer diameter of the base portion 12 is smaller than the outer diameter of the main body portion 2. The projections of the protruding portions 11 of adjacent channel laminations 10 along the axial direction of the stator core do not intersect.

[0043] The protruding portion 11 can serve as a process feature, positioning the channel lamination 10 during machining, stator core assembly, and other processes. Figure 8 In the diagram, the solid arrows indicate the flow direction of the heat exchange medium in the circumferential channel 9. Since the projections of the protruding portions 11 of adjacent channel laminations 10 along the axial direction of the stator core do not intersect, that is, the protruding portions 11 of adjacent channel laminations 10 are misaligned with each other, the protruding portions 11 will not block the circumferential channel 9 on the path of the circumferential channel 9, that is, in the circumferential direction of the stator core, thus maintaining the flow of the circumferential channel 9.

[0044] In some specific alternative embodiments, the number of channel laminations 10 can be reasonably selected according to actual needs, for example, 2 or 3. Increasing the number of channel laminations 10 is beneficial to increasing the flow cross-sectional area of ​​the circumferential channel 9 and the radial channel 5. The structural strength of the main body lamination 20 is better than that of the channel laminations 10. If the number of channel laminations 10 is reduced, the number of main body laminations 20 can be increased, which is beneficial to improving the overall structural strength of the stator core.

[0045] like Figure 5 As shown, in this embodiment, the radial dimension of the channel lamination 10 at the protruding portion 11 is the same as the radial dimension of the main body 2. That is, the outer diameter of the channel lamination 10 at the protruding portion 11 is the same as the overall outer diameter of the main body 2. This allows the channel lamination 10 and the main body lamination 20 to share the same outer diameter positioning structure in a mold that relies on outer diameter positioning, simplifying the lamination process. When using an in-mold dispensing production process, the channel lamination 10 and the main body lamination 20 can also be blanked at the same stamping station, simplifying production equipment and processes. This is beneficial for the mass production of the channel lamination 10 and the main body lamination 20, and consequently, for the mass production of the stator core.

[0046] Meanwhile, the outer diameter of the channel lamination 10 at the protruding portion 11 is the same as the overall outer diameter of the main body 2, which helps to maintain the consistency of the stator core and the outer circumferential dimensions of the motor stator. This facilitates the installation of the motor stator when it is installed inside the motor housing 30. The protruding portion 11 fits with the inner wall of the housing 30, which helps to increase the support of the motor stator for the housing 30 and also helps to increase the interference fit area between the motor stator and the housing 30.

[0047] like Figure 4 , Figure 5 As shown, in this embodiment, a process notch 22 is provided on the outer edge of the main body lamination 20. The process notch 22 can be used to position the channel lamination 10 during the processing of the main body lamination 20 and the assembly of the stator core.

[0048] like Figure 1 As shown, in another optional embodiment, the main body 2 includes two or more main body laminations 20, which are stacked sequentially along the axial direction of the stator core and bonded to each other. Adjacent channel laminations 10 can also be bonded to each other, as well as to the main body laminations 20. The bonding process is simple and convenient, and the deformation of the main body laminations 20 and channel laminations 10 is small during the bonding process, which is beneficial to maintaining the dimensional accuracy of the stator core.

[0049] In this embodiment, there are multiple radial channels 5, all evenly arranged around the axis of the stator core. Correspondingly, in this embodiment, there are multiple axial channels 4, all evenly arranged around the axis of the stator core. The even arrangement of the axial channels 4 and radial channels 5 facilitates uniform heat exchange between the heat exchange medium, such as cooling oil, and the electronic stator.

[0050] In this embodiment, each radial channel 5 corresponds to each axial channel 4. Each axial channel 4 is connected to the circumferential channel 9 through its corresponding radial channel 5. The heat exchange medium received by the circumferential channel 9 flows into the corresponding axial channel 4 through the radial channel 5 and flows out through the corresponding axial channel 4, thereby exchanging heat for components such as the winding 40 of the motor stator. The heat exchange media in each radial channel 5 and the heat exchange media in each axial channel 4 do not interfere with each other during the flow process, which is conducive to the smooth flow of the heat exchange media.

[0051] Specifically, in this embodiment, multiple channel notches 13 are formed on the outer edge of the channel lamination 10, and the channel notches 13 of each channel lamination 10 are stacked to form a radial channel 5. The main body 2 includes two or more main body laminations 20 stacked sequentially along the axial direction of the stator core. Channel holes 21 are formed on the main body laminations 20, and the channel holes 21 of each main body lamination 20 are stacked to form an axial channel 4.

[0052] In this embodiment, the main body stamping 20 is annular, and the inner edge of the main body stamping 20 has a tooth-like structure 7 that protrudes radially inward along the main body stamping 20, and a groove structure 8 is formed between adjacent tooth-like structures 7.

[0053] In this embodiment, the channel punch 10 is also annular, and the inner edge of the channel punch 10 also has a toothed structure 7 that protrudes radially inward along the channel punch 10. A groove structure 8 is formed between adjacent toothed structures 7. The toothed structure 7 and the groove structure 8 of the channel punch 10 and the main punch 20 have the same shape and number.

[0054] The groove structure 8 of the channel lamination 10 and the main lamination 20 forms the winding slot of the stator core after the channel lamination 10 and the main lamination 20 are stacked, which is used to accommodate the winding 40 of the motor stator. The tooth structure 7 of the channel lamination 10 and the main lamination 20 forms the tooth of the stator core after the channel lamination 10 and the main lamination 20 are stacked, and the winding 40 can be wound on the tooth.

[0055] like Figure 6As shown, the included angle between the protruding directions of two adjacent protrusions 11 in the circumferential direction of the stator core is α. In this embodiment, the included angle between the protruding directions of two adjacent protrusions 11 in the circumferential direction of the stator core is the acute angle formed by the intersection of the center lines of the two adjacent protrusions 11 in the radial direction of the stator core. α = 360n / s, where n is greater than 1 and less than s / 3, n is a positive integer, and s is the number of toothed structures 7 or grooved structures 8 on the channel lamination 10 or the main lamination 20, which is also the number of slots or teeth in the motor stator winding. For example, s can be 36, n can be 3, and the included angle α is 30°.

[0056] In this embodiment, in the radial direction of the main lamination 20, the channel holes 21 are positioned near the root of the tooth structure 7 or the bottom of the groove structure 8 relative to the outer edge of the main lamination 20. Because the channel holes 21 are positioned near the root of the tooth structure 7 or the bottom of the groove structure 8 relative to the outer edge of the main lamination 20, the axial channel 4 formed by the superimposed channel holes 21 also corresponds to the root of the stator core teeth or the bottom of the winding slot, thereby increasing the heat transfer efficiency between the heat transfer medium in the axial channel 4 and the winding 40. The more channel holes 21 on the main lamination 20, the more axial channels 4 there are in the stator core, and the better the heat transfer effect between the heat transfer medium and the main lamination 20 within the circumferential channel 9. Conversely, if the number of channel holes 21 on the main lamination 20 decreases, the number of main laminations increases accordingly. In this embodiment, the number of channel holes 21 on the main body lamination 20 is m, and the number of toothed structures 7 and groove structures 8 is s, that is, the number of motor stator winding slots and teeth is s. Then m = s / q, where q takes the value of a positive integer less than or equal to 4, such as 1, 2, 3, etc. This maintains the structural strength of the main body lamination 20 while helping to obtain a better heat exchange effect.

[0057] In some alternative embodiments, the main body is provided with an end plate on the end away from the channel section 1 in the direction of the stator core axis. The end plate has an adjustment hole communicating with the axial channel. The adjustment hole is configured to adjust the flow direction and / or flow rate of the heat exchange medium flowing out from the axial channel.

[0058] Specifically, the end fins can include various specifications. The orientation and size of the adjustment holes on the end fins of different specifications can be different. When the heat exchange medium flowing out of the axial channel passes through the corresponding adjustment hole on the end fin, the adjustment hole guides and / or restricts the flow of the heat exchange medium, thereby adjusting the flow direction and flow rate of the heat exchange medium flowing out of the axial channel.

[0059] This embodiment also provides a motor stator, including a winding 40 and a stator core as described above, wherein the winding 40 is disposed on the stator core. This embodiment also provides a motor, including a housing 30 and a motor stator as described above, wherein the motor stator is disposed within the housing 30. In this embodiment, the housing 30 is provided with a heat exchange medium inlet 31, i.e., an oil inlet, for adding a heat exchange medium such as cooling oil from outside the motor to inside the motor. Figure 10 As shown, the solid arrows indicate the flow direction of the heat exchange medium. For example, heat exchange medium such as cooling oil enters the shell 30 from the heat exchange medium inlet 31 on the shell 30, enters the circumferential channel 9 and flows along the circumferential channel 9, thereby flowing evenly into each radial channel 5, and then flowing from each radial channel 5 into the corresponding axial channel 4 and finally flowing out. Taking cooling oil as an example, the cooling oil cools the winding 40 during the flow process and after flowing out from the axial channel 4.

[0060] In summary, the stator core, motor stator, and motor provided in this embodiment have a stator core with at least a portion of the outer diameter of the channel portion 1 being smaller than the outer diameter of the main body portion 2. This allows for the formation of a circumferential channel 9 extending circumferentially along the stator core. The circumferential channel 9 has a receiving opening facing outwards from the stator core, i.e., towards the inner wall of the housing 30. This allows for the reception of heat exchange media such as cooling oil, and the transport of such heat exchange media along the circumferential direction of the stator core. This eliminates the need for retaining ring parts and additional structural features such as circumferential oil grooves on the housing 30, which simplifies the motor structure and reduces the assembly difficulty of the motor.

[0061] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A stator core characterized by, The stator core comprises a main body portion and a channel portion, the main body portion and the channel portion are sequentially arranged along the stator core axis direction, The channel portion has radial channels extending along the radial direction of the stator core, and the main body portion has axial channels extending along the axial direction of the stator core and penetrating through the main body portion, the axial channels are communicated with the radial channels, The outer diameter of the channel portion is smaller than the outer diameter of the main body portion, so as to form a circumferential channel extending along the circumferential direction of the stator core, the circumferential channel has an accepting opening facing outward of the stator core and is communicated with the radial channels.

2. The stator core of claim 1, characterized by: The channel portion comprises two or more channel stamping sheets which are sequentially stacked along the axial direction of the stator core, The channel stamping sheet has a base portion and a protruding portion protruding outward from the outer edge of the base portion, the outer diameter of the base portion is smaller than the outer diameter of the main body portion, and the projections of the protruding portions of adjacent channel stamping sheets along the axial direction of the stator core do not intersect.

3. The stator core of claim 2, characterized by: The main body portion comprises two or more main body stamping sheets which are sequentially stacked along the axial direction of the stator core, the main body stamping sheet is annular, the inner edge of the main body stamping sheet has a tooth structure protruding inward along the radial direction of the main body stamping sheet, and the adjacent tooth structures form a groove structure, the included angle between the protruding directions of two adjacent protruding portions in the circumferential direction of the stator core is a, a = 360n / s, n is greater than 1 and less than s / 3, n is a positive integer, and s is the number of the tooth structure or the groove structure.

4. The stator core of claim 2, characterized by: The radial dimension of the protruding portion of the channel stamping sheet is the same as the radial dimension of the main body portion.

5. The stator core according to any one of claims 1 to 4, characterized by: The main body portion comprises two or more main body stamping sheets which are sequentially stacked along the axial direction of the stator core and are bonded to each other.

6. The stator core according to any one of claims 2 to 4, characterized by: The outer edge of the channel stamping sheet is provided with a plurality of channel notches, the channel notches of each channel stamping sheet are stacked to form each radial channel, and each radial channel is arranged in one-to-one correspondence with each axial channel.

7. The stator core according to any one of claims 1 to 4, characterized by: The main body portion comprises two or more main body stamping sheets which are sequentially stacked along the axial direction of the stator core, and the main body stamping sheet is provided with a channel hole, and the channel holes of each main body stamping sheet are stacked to form the axial channel.

8. The stator core of claim 7, characterized by: The main body stamping sheet is annular, the inner edge of the main body stamping sheet has a tooth structure protruding inward along the radial direction of the main body stamping sheet, and the adjacent tooth structures form a groove structure, and in the radial direction of the main body stamping sheet, the channel hole is arranged close to the root of the tooth structure or the bottom of the groove structure relative to the outer edge of the main body stamping sheet.

9. The stator core according to any one of claims 1 to 4, characterized by: The main body portion is provided with an end stamping sheet at one end of the main body portion away from the channel portion in the stator core axis direction, the end stamping sheet is provided with an adjusting hole communicated with the axial channel, and the adjusting hole is configured to adjust the flow direction and / or flow rate of the heat exchange medium flowing out of the axial channel.

10. An electric machine stator characterized by: The stator core comprises a winding and a stator core according to any one of claims 1-9, and the winding is arranged on the stator core.

11. An electric machine characterized by: The motor stator as claimed in claim 10 is arranged in the shell, and a heat exchange medium opening is arranged on the shell and communicates with the circumferential channel.

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