Motor stator structure and method of fixing the same

Abstract

This application relates to the field of motor technology and provides a motor stator structure and its fixing method. The motor stator structure includes: a first connecting sleeve, a stator core, a second connecting sleeve, and multiple connecting members; the first connecting sleeve has multiple first through holes; the stator core is located inside the first connecting sleeve and is annular; the stator core has multiple connecting holes along its circumference, extending from the inner edge to the outer edge of the stator core; a portion of the multiple connecting holes are defined as positioning holes, and multiple positioning holes are provided, each corresponding to one of the multiple first through holes; the second connecting sleeve is located inside the stator core, and multiple connecting members are provided, each corresponding to one of the multiple positioning holes. The connecting members are located inside their respective positioning holes, with the first end of the connecting member connected to the corresponding first through hole and the second end of the connecting member connected to the second connecting sleeve; this application improves the efficiency and reliability of motor stator structure assembly.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to the stator structure of a motor and its fixing method. Background Technology

[0002] Electric motors are one of the main devices for energy conversion, and their electrical and mechanical properties affect the efficiency and reliability of energy conversion.

[0003] In related technologies, the positioning and assembly of the motor stator is quite difficult, which affects the overall assembly efficiency and reliability of the motor. Summary of the Invention

[0004] Therefore, it is necessary to provide a motor stator structure and its fixing method to address the problems of low stator assembly efficiency and reliability in related technologies.

[0005] According to one aspect of this application, an embodiment of this application provides a motor stator structure, including a first connecting sleeve, a stator core, a second connecting sleeve, and a plurality of connecting members; the first connecting sleeve is provided with a plurality of first through holes; the stator core is located inside the first connecting sleeve, the stator core has a central axis, and the shape of the orthographic projection of the stator core on a plane perpendicular to the central axis is annular; the stator core is provided with a plurality of connecting holes along the circumferential direction, the axis of the connecting holes is perpendicular to the central axis, and the connecting holes extend from the inner edge of the stator core to the outer edge of the stator core; a portion of the plurality of connecting holes is defined as positioning holes, and there are a plurality of positioning holes, each of which corresponds to a plurality of first through holes; the second connecting sleeve is located inside the stator core; the plurality of connecting members are each corresponding to a plurality of positioning holes, the connecting members are located in the corresponding positioning holes, the first end of the connecting member is connected to the corresponding first through hole, and the second end of the connecting member is connected to the second connecting sleeve.

[0006] In one embodiment, a portion of the multiple connectors are configured as metal connectors, and the remaining portion of the multiple connectors are configured as non-metallic connectors. The number of metal connectors is less than or equal to a preset number of pole pairs. The preset number of pole pairs is the number of pole pairs of the motor corresponding to the motor stator structure.

[0007] In one embodiment, the first connecting sleeve is further provided with a group of holes; the group of holes includes a wire outlet hole and an oil hole, which are arranged sequentially along the circumference. The wire outlet hole is used for the winding wires on the stator core to exit, and the oil hole is used for the flow of lubricating oil.

[0008] In one embodiment, the remaining portion of the connecting holes among the plurality of connecting holes is defined as clearance holes, and the clearance holes are arranged opposite to the hole group.

[0009] In one embodiment, the oil hole includes an oil inlet and an oil outlet; the oil inlet is used to communicate with the outlet of the oil inlet pipe, and the oil outlet is used to communicate with the inlet of the oil outlet pipe.

[0010] In one embodiment, at least one first through hole is provided between the outlet hole and the oil hole.

[0011] In one embodiment, the second connecting sleeve is provided with a plurality of second through holes, and the plurality of second through holes are provided in a one-to-one correspondence with the plurality of connecting holes; the second end of the connector is connected to the corresponding second through hole.

[0012] In one embodiment, the connector is a locating pin.

[0013] In one embodiment, the second connecting sleeve includes a sleeve body, a plate, and a pressing member; the axis of the sleeve body, the axis of the plate, and the axis of the pressing member coincide with each other, and the end face of the sleeve body along the axial direction of the sleeve body is detachably connected to the pressing member through the plate.

[0014] According to another aspect of this application, embodiments of this application also provide a method for fixing a motor stator structure, applied to the motor stator structure described above, comprising:

[0015] Obtain the number of pole pairs of the motor corresponding to the motor stator structure;

[0016] The number of metal connectors among multiple connectors is determined based on the number of pole pairs.

[0017] The first through hole of the first connecting sleeve, the positioning hole of the stator core, and the second connecting sleeve are connected sequentially through the connecting member;

[0018] The number of the metal connectors is less than or equal to the number of pole pairs.

[0019] The above-mentioned motor stator structure and its fixing method select an appropriate number of connectors according to the magnitude of the axial electromagnetic force on the motor stator structure, and then connect the first connecting sleeve, stator core and second connecting sleeve by means of matching first through hole and positioning hole through insertion.

[0020] In the actual assembly process of the motor stator structure, the second connecting sleeve, stator core and first connecting sleeve are arranged radially from the inside to the outside. The number of connecting parts required is determined according to the magnitude of the axial electromagnetic force on the motor stator structure in the corresponding motor. The greater the axial electromagnetic force, the more connecting parts are required. Correspondingly, the more positioning holes are required. The positioning holes are a part of the multiple connecting holes. According to the actual axial electromagnetic force requirements, a certain number of connecting holes are selected as positioning holes. That is, not all connecting holes are used to install connecting parts.

[0021] The connector is pressed in through the first through hole. As the connector gradually extends in, it passes through the corresponding positioning hole and finally connects with the second connecting sleeve. The connection of the first connecting sleeve, the stator core, and the second connecting sleeve can be achieved by pressing in the connector. The assembly process is relatively simple and improves the assembly efficiency. Since the axis of the positioning hole is perpendicular to the central axis, the axis of the connector is perpendicular to the direction of the axial electromagnetic force. The connector plays the role of bearing the axial electromagnetic force. Under the action of the connector, the first connecting sleeve, the stator core, and the second connecting sleeve can maintain good consistency, reduce axial movement and misalignment among the three, and improve the reliability of the assembly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a motor stator structure provided in one embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the structure of a stator core provided in one embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the structure of a first connecting sleeve provided in one embodiment of this application.

[0025] Figure 4 This is a schematic diagram of the structure of a sleeve body provided in one embodiment of this application.

[0026] Figure 5 This is a schematic diagram of the overall structure of the second connecting sleeve provided in one embodiment of this application.

[0027] Figure 6 This is a flowchart illustrating a fixing method provided in one embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. First connecting sleeve; 110. First through hole; 120. Hole group; 121. Cable outlet hole; 122. Oil hole; 1221. Oil inlet hole; 1222. Oil outlet hole;

[0030] 200. Stator core; 210. Connecting hole;

[0031] 300. Second connecting sleeve; 310. Second through hole; 320. Sleeve body; 330. Press-fit component;

[0032] 400. Connectors. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0039] See Figure 1 and Figure 2 , Figure 1 A schematic diagram of the motor stator structure according to one embodiment of this application is shown. Figure 2 A schematic diagram of a stator core in one embodiment of this application is shown. The motor stator structure provided in one embodiment of this application includes a first connecting sleeve 100, a stator core 200, a second connecting sleeve 300, and a plurality of connecting members 400.

[0040] The first connecting sleeve 100 has multiple first through holes 110; the stator core 200 is located inside the first connecting sleeve 100, the stator core 200 has a central axis, and the orthographic projection of the stator core 200 on a plane perpendicular to the central axis is annular; the stator core 200 has multiple connecting holes 210 along the circumferential direction, which is the direction around the central axis, the axis of the connecting holes 210 is perpendicular to the central axis, and the connecting holes 210 extend from the inner edge of the stator core 200 to the outer edge of the stator core 200. Outer edge; Define a portion of the multiple connecting holes 210 as positioning holes, and provide multiple positioning holes, which are configured one-to-one with multiple first through holes 110; The second connecting sleeve 300 is located inside the stator core 200, and multiple connectors 400 are configured one-to-one with multiple positioning holes. The connectors 400 are located inside the corresponding positioning holes, and the first end of the connector 400 is connected to the corresponding first through hole 110, and the second end of the connector 400 is connected to the second connecting sleeve 300.

[0041] Specifically, in the motor stator structure shown in this embodiment, a suitable number of connectors 400 are selected according to the magnitude of the axial electromagnetic force on the motor stator structure. Then, the first connecting sleeve 100, the stator core 200 and the second connecting sleeve 300 are connected by plugging in the matching first through hole 110 and positioning hole.

[0042] In the actual assembly process of the motor stator structure, the second connecting sleeve 300, stator core 200 and first connecting sleeve 100 are arranged radially from the inside to the outside. The number of connecting parts required is determined according to the magnitude of the axial electromagnetic force experienced by the motor stator structure in the corresponding motor. The greater the axial electromagnetic force, the more connecting parts are required, and correspondingly, the more positioning holes are required. The positioning holes are a part of the multiple connecting holes 210. According to the actual axial electromagnetic force requirements, a certain number of connecting holes 210 are selected as positioning holes. That is, not all connecting holes 210 are used to install the connecting parts 400.

[0043] The connector 400 is pressed into the first through hole 110. As the connector 400 gradually extends in, it passes through the corresponding positioning hole and finally connects with the second connecting sleeve 300. The connection of the first connecting sleeve 100, the stator core 200 and the second connecting sleeve 300 can be achieved by pressing in the connector 400. The assembly process is relatively simple and improves the assembly efficiency. Since the axis of the positioning hole is perpendicular to the central axis, the axis of the connector 400 is perpendicular to the direction of the axial electromagnetic force. The connector 400 plays the role of bearing the axial electromagnetic force. Under the action of the connector 400, the first connecting sleeve 100, the stator core 200 and the second connecting sleeve 300 can maintain good consistency, reduce axial movement and misalignment among the three and improve the reliability of the assembly.

[0044] Among them, the stator core 200 is the stator iron core, and the stator core 200 is used to arrange the windings. The first connecting sleeve 100 is an aluminum connecting sleeve, that is, the material of the first connecting sleeve 100 is aluminum. The second connecting sleeve 300 is a stainless steel connecting sleeve, that is, the material of the second connecting sleeve 300 is stainless steel. The axis of the first connecting sleeve 100, the central axis of the stator core 200 and the axis of the second connecting sleeve 300 coincide with each other.

[0045] Combination Figure 2 As shown, in some embodiments, the connecting hole 210 shown in this embodiment is provided on the yoke of the stator core 200. The connecting hole 210 passes through both ends of the yoke so that the connector 400 can pass through the corresponding positioning hole and connect to the first connecting sleeve 100 and the second connecting sleeve 300 respectively. Figure 2 The diagram shows 18 connecting holes 210, so the number of positioning holes is less than 18.

[0046] For ease of processing and installation, the axis of the connecting hole 210 is arranged radially along the stator core 200.

[0047] In some embodiments, a portion of the multiple connectors 400 shown in this embodiment are configured as metal connectors, while the remaining portion of the multiple connectors 400 are configured as non-metallic connectors. The number of metal connectors is less than or equal to a preset number of pole pairs. The preset number of pole pairs is the number of pole pairs of the motor corresponding to the motor stator structure.

[0048] Specifically, based on considerations of connection strength, a certain number of metal connectors must be included among the multiple connectors 400. However, the number of metal connectors cannot exceed the number of pole pairs of the motor. The reason is that when the number of metal connectors exceeds the number of pole pairs of the motor, the metal connectors will form redundant magnetic field loops with the first connecting sleeve 100 and the second connecting sleeve 300, thereby affecting the performance of the motor. Therefore, in the actual selection process of connectors 400, a certain number of metal connectors are first selected, and then, in combination with the magnitude of the axial electromagnetic force, several non-metallic connectors that are neither magnetic nor conductive are selected for consideration of structural strength.

[0049] Among them, the metal connectors can be stainless steel connectors, that is, the material of the metal connectors is stainless steel, and the non-metallic connectors can be ceramic connectors, polyimide connectors or plastic connectors, that is, the material of the non-metallic connectors is ceramic, polyimide or plastic.

[0050] Combination Figure 3 As shown, Figure 3 A schematic diagram of the structure of the first connecting sleeve 100 in one embodiment of this application is shown. In some embodiments, the first connecting sleeve 100 shown in this embodiment is also provided with a hole group 120. The hole group 120 includes a wire outlet hole 121 and an oil hole 122. The wire outlet hole 121 and the oil hole 122 are arranged sequentially along the circumference. The wire outlet hole 121 is used to supply the winding wire on the stator core 200, and the oil hole 122 is used to supply lubricating oil.

[0051] Specifically, the three-phase windings on the stator core 200 are led out of the first connecting sleeve 100 through the outlet hole 121. The cross-section of the outlet hole 121 is a rectangle with a transition rounded corner. The transition rounded corner is used to reduce the wear of the inner wall of the outlet hole 121 on the cable. Lubricating oil flows in and out through the oil hole 122, thereby lubricating the rotation process of the motor rotor.

[0052] Furthermore, combined Figure 1 and Figure 3 As shown, in some embodiments, the remaining portion of the connecting holes 210 is defined as clearance holes, and the clearance holes are arranged opposite to the hole group 120.

[0053] Specifically, the clearance hole and the positioning hole are relative concepts. Based on the actual angular relationship between the stator core 200 and the first connecting sleeve, the connecting hole 210 arranged opposite to the first through hole 110 is the positioning hole, and the connecting hole 210 arranged opposite to the hole group 120 is the clearance hole. No connecting piece 400 is provided in the clearance hole, thereby avoiding the wire outlet hole 121 and the oil hole 122, so that the three-phase winding can be output normally and the lubricating oil can flow normally.

[0054] in, Figure 1 The diagram shows that there are 3 clearance holes opposite to the hole group 120, so the number of positioning holes is 15, and the number of first through holes 110 is also 15.

[0055] Combination Figure 3 As shown, in some embodiments, the oil hole 122 shown in this embodiment includes an oil inlet hole 1221 and an oil outlet hole 1222. The oil inlet hole 1221 is used to communicate with the outlet of the oil inlet pipe, and the oil outlet hole 1222 is used to communicate with the inlet of the oil outlet pipe, so as to facilitate the replenishment or replacement of lubricating oil.

[0056] Combination Figure 1 and Figure 3 As shown, in some embodiments, at least one first through hole 110 is provided between the outlet hole 121 and the oil hole 122 shown in this embodiment.

[0057] Specifically, since no connector 400 is provided at the positions of the outlet hole 121 and the oil hole 122, the structural strength at the outlet hole 121 and the oil hole 122 is low overall. Therefore, at least one first through hole 110 needs to be arranged between the outlet hole 121 and the oil hole 122 so that at least one connector 400 can be arranged there to improve the structural strength.

[0058] Among them, Figure 1 and Figure 3 The diagram shows a first through hole 110 arranged between the outlet hole 121 and the oil hole 122.

[0059] Combination Figure 4 and Figure 5 As shown, Figure 4 A schematic diagram of the sleeve body in one embodiment of this application is shown. Figure 5 A schematic diagram of the overall structure of the second connecting sleeve in one embodiment of this application is shown; in some embodiments, the second connecting sleeve 300 shown in this embodiment is provided with a plurality of second through holes 310, and the plurality of second through holes 310 are provided in a one-to-one correspondence with a plurality of connecting holes 210; the second end of the connector 400 is connected to the corresponding second through hole 310.

[0060] Specifically, during the gradual pressing of the connector 400, the connector 400 is pressed into the first through hole 110, the positioning hole, and the corresponding second through hole 310 in sequence, which is equivalent to the connector 400 being inserted into the first connecting sleeve 100, the stator core 200, and the second connecting sleeve 300 respectively. Before assembly, the first through hole 110, the positioning hole, and the corresponding second through hole 310 are aligned to facilitate the pressing of the connector 400. At the same time, the number of connectors 400 is actually less than the number of connecting holes 210, that is, the number of connectors 400 is less than the number of second through holes 310. In other words, not all second through holes 310 are used, but the connector 400 is pressed into the corresponding second through hole 310 according to actual needs.

[0061] In some embodiments, the connector 400 shown in this embodiment is a locating pin.

[0062] Combination Figure 4 and Figure 5 As shown, in some embodiments, the second connecting sleeve 300 shown in this embodiment includes a sleeve body 320, a plate and a pressing member 330; the axis of the sleeve body 320, the axis of the plate and the axis of the pressing member 330 coincide with each other, and the end face of the sleeve body 320 along the axial direction of the sleeve body 320 is detachably connected to the pressing member 330 through the plate.

[0063] Specifically, the second connecting sleeve 300 is used to connect the bearing, the pressing member 330 is annular, that is, the pressing member 330 is equivalent to a pressure ring, the plate body serves as a structural component and plays a supporting role. The pressing member 330 presses the plate body onto the end face of the sleeve body 320, thereby realizing the assembly of the second connecting sleeve 300.

[0064] This application also provides a method for fixing a motor stator structure, which is applied to the motor stator structure described above.

[0065] Combination Figure 6 As shown, Figure 6 A flowchart illustrating a fixing method according to an embodiment of this application is shown. In some embodiments, the fixing method shown in this embodiment includes: S610, S620 and S630.

[0066] S610. Obtain the number of pole pairs of the motor corresponding to the motor stator structure.

[0067] In this step, the motor stator structure is a part of the motor structure, and the number of pole pairs is one of the inherent parameters of the motor. The number of pole pairs provides a basis for the selection of subsequent connecting parts.

[0068] S620. Determine the number of metal connectors among multiple connectors based on the number of pole pairs.

[0069] In this step, in order to overcome the problem that when there are too many metal connectors, the metal connectors will form redundant magnetic field loops with the first and second connecting sleeves, the number of metal connectors must be less than or equal to the number of pole pairs.

[0070] After determining the number of metal connectors, a certain number of non-metallic connectors that are neither conductive nor magnetic can be added for structural strength considerations. The sum of the number of metal connectors and the number of non-metallic connectors is the total number of connectors.

[0071] S630, The first through hole of the first connecting sleeve, the positioning hole of the stator core and the second connecting sleeve are connected in sequence by the connector.

[0072] In this step, the connector is pressed in through the first through hole. The first connector passes through the first through hole and the positioning hole in sequence and extends into the corresponding second through hole on the second connecting sleeve. After all the connectors are installed, the assembly of the motor stator structure is completed.

[0073] The fixing method is explained below with reference to a specific embodiment. First, the number of pole pairs of the motor is determined to be 12, so 12 metal pins are selected. At the same time, considering the connection strength due to axial electromagnetic force, 3 plastic pins are also selected, so there are a total of 15 connectors with a diameter of 5mm. During installation, the first through hole, the positioning hole and the second through hole are aligned, and the first through hole, the positioning hole and the second through hole together form a pin hole. Then, the metal pins and plastic pins are pressed into the corresponding pin holes to complete the assembly of the motor stator structure.

[0074] Although the motor stator structure is asymmetrical due to the presence of the oil inlet, oil outlet, and wire outlet, the three plastic pins do not form an additional magnetic circuit and therefore will not affect the motor's performance.

[0075] After assembling the motor stator structure, the axial flux permanent magnet synchronous motor is assembled. The structure of this axial flux permanent magnet synchronous motor is a dual-rotor single-stator structure (Torus). The dual-rotor single-stator structure (Torus) has two rotor structures, which are installed on both sides of the motor stator structure along the axial direction of the motor stator structure. Therefore, the axial electromagnetic force on the motor stator structure is equal. Correspondingly, the dual-rotor single-stator structure (Torus) has better performance in terms of torque density and power density, and is widely used.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0077] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A motor stator structure, characterized in that, The motor stator structure includes: A first connecting sleeve, wherein the first connecting sleeve is provided with a plurality of first through holes; A stator core is located within the first connecting sleeve. The stator core has a central axis, and its orthographic projection onto a plane perpendicular to the central axis is annular. The stator core has multiple connecting holes circumferentially arranged, with the axes of these holes perpendicular to the central axis. These connecting holes extend from the inner edge of the stator core to its outer edge. A portion of these connecting holes are defined as positioning holes, and multiple positioning holes are provided, each corresponding to one of the multiple first through holes. A second connecting sleeve, the second connecting sleeve being located within the stator core; and Multiple connectors are provided, each corresponding to one of the multiple positioning holes. The connectors are located in the corresponding positioning holes. The first end of the connector is connected to the corresponding first through hole, and the second end of the connector is connected to the second connecting sleeve.

2. The motor stator structure according to claim 1, characterized in that, A portion of the multiple connectors are configured as metal connectors, while the remaining portion of the multiple connectors are configured as non-metal connectors, and the number of metal connectors is less than or equal to a preset number of pole pairs. The preset number of pole pairs is the number of pole pairs of the motor corresponding to the motor stator structure.

3. The motor stator structure according to claim 1, characterized in that, The first connecting sleeve is also provided with a group of holes; The hole group includes a wire outlet hole and an oil hole, which are arranged sequentially along the circumference. The wire outlet hole is used for the winding wires on the stator core to exit, and the oil hole is used for the flow of lubricating oil.

4. The motor stator structure according to claim 3, characterized in that, The remaining portion of the connecting holes among the plurality of connecting holes are defined as clearance holes, and the clearance holes are arranged opposite to the hole group.

5. The motor stator structure according to claim 3, characterized in that, The oil hole includes an oil inlet hole and an oil outlet hole; The oil inlet hole is used to connect with the outlet of the oil inlet pipe, and the oil outlet hole is used to connect with the inlet of the oil outlet pipe.

6. The motor stator structure according to claim 3, characterized in that, At least one first through hole is provided between the outlet hole and the oil hole.

7. The motor stator structure according to any one of claims 1 to 6, characterized in that, The second connecting sleeve is provided with a plurality of second through holes, and the plurality of second through holes are provided in a one-to-one correspondence with the plurality of connecting holes; the second end of the connector is connected to the corresponding second through hole.

8. The motor stator structure according to any one of claims 1 to 6, characterized in that, The connector is a locating pin.

9. The motor stator structure according to any one of claims 1 to 6, characterized in that, The second connecting sleeve includes a sleeve body, a plate body, and a pressing component; The axis of the sleeve body, the axis of the plate body, and the axis of the pressing member coincide with each other, and the end face of the sleeve body along the axis of the sleeve body is detachably connected to the pressing member through the plate body.

10. A method for fixing a motor stator structure, applied to the motor stator structure as described in any one of claims 1 to 9, characterized in that, include: Obtain the number of pole pairs of the motor corresponding to the motor stator structure; The number of metal connectors among multiple connectors is determined based on the number of pole pairs. The first through hole of the first connecting sleeve, the positioning hole of the stator core, and the second connecting sleeve are connected sequentially through the connecting member; The number of the metal connectors is less than or equal to the number of pole pairs.

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