Cooling device

Abstract

The utility model relates to the technical field of magnetic drive stators, in particular to a cooling device. The cooling device is applied to the magnetic drive stator and comprises a bottom plate assembly and a cooling pipe. The bottom plate assembly comprises a curve part, and the curve part is provided with a mounting groove. The cooling pipe is mounted in the mounting groove, and the interior of the cooling pipe is used for introducing cooling liquid; the stator coil is connected to the curve part, at least part of the structure of the stator coil extends along the curve and is projected in the arrangement direction of the bottom plate assembly and the stator coil, and the projection area of the cooling pipe and the projection area of the stator coil at least partially coincide. According to the embodiment of the invention, when the magnetic drive conveying line is in the working state for a long time, the stator coil can generate heat, and the stator coil is relatively compact on the inward side of the curve part, so that the temperature of the inner side of the curve part is relatively high. When cooling liquid is introduced into the cooling pipe, the cooling pipe can cool the stator coil, the temperature rise of the stator coil is relieved, and therefore the situation that the stability of the magnetic drive conveying line is affected by high temperature is reduced.

Description

Technical Field

[0001] This application relates to the field of magnetic drive stator technology, and in particular to a cooling device. Background Technology

[0002] Currently, magnetically driven conveyor lines mainly consist of magnetically coupled stator conveyor lines and mover modules. The stator conveyor lines are responsible for driving the mover modules to move along a preset path. When the mover module carries an object, it can pull the object to move together, thereby realizing the transport of the object.

[0003] In related technologies, when a magnetic drive conveyor line is under prolonged overload operation, its stability will become poor. Utility Model Content

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a cooling device that can solve the problem that the stability of the magnetic drive conveyor line deteriorates when it is under prolonged overload operation.

[0005] A cooling device according to a first aspect embodiment of the present application is applied to a magnetic drive stator, the magnetic drive stator including stator coils, the cooling device comprising:

[0006] A base plate assembly includes a curved portion having a mounting groove;

[0007] A cooling pipe is installed in the mounting groove, and the interior of the cooling pipe is used to circulate coolant; a stator coil is connected to the curved section, and at least a portion of the structure of the stator coil extends along the curve and is projected along the arrangement direction of the base plate assembly and the stator coil, and the projection area of ​​the cooling pipe at least partially overlaps with the projection area of ​​the stator coil.

[0008] The cooling device according to the embodiments of this application has at least the following beneficial effects:

[0009] In this embodiment, the base plate assembly includes a curved section with a mounting groove, and the stator coil is connected to the curved section. When the magnetic drive conveyor line is in operation for a long time, the stator coil generates heat. The stator coil is more compact on the inward side of the curved section, resulting in a higher temperature on the inner side of the curved section. The cooling pipe is installed in the mounting groove of the curved section, and the projection area of ​​the cooling pipe is partially located within the projection area of ​​the stator coil. When coolant is introduced into the cooling pipe, it can cool the stator coil, alleviating the temperature rise of the stator coil and reducing the impact of high temperature on the stability of the magnetic drive conveyor line.

[0010] According to some embodiments of this application, the curved portion includes a base plate and a thermally conductive adhesive layer, the base plate and the thermally conductive adhesive layer forming a mounting groove, at least a portion of the structure of the cooling pipe is located within the thermally conductive adhesive layer, the thermally conductive adhesive layer is located between the stator coil and the base plate, and the stator coil is connected to the thermally conductive adhesive layer.

[0011] According to some embodiments of this application, there are multiple mounting slots, and the multiple mounting slots are isolated from each other.

[0012] According to some embodiments of this application, the mounting groove includes a plurality of curved grooves and a plurality of straight grooves, and two adjacent straight grooves are connected through the corresponding curved grooves.

[0013] According to some embodiments of this application, when projecting along the arrangement direction of the curved portion and the stator coil, the projection area of ​​the straight groove at least partially overlaps with the projection area of ​​the stator coil.

[0014] According to some embodiments of this application, the mounting groove has a liquid inlet and a liquid outlet. In two adjacent mounting grooves, along the length direction of the curved portion, the liquid outlet corresponding to one mounting groove is located on the side opposite to the liquid inlet corresponding to the other mounting groove.

[0015] According to some embodiments of this application, the cooling pipe has an inlet portion and an outlet portion, the curved portion has a curved first edge and a curved second edge, the radius of curvature of the second edge is smaller than the radius of curvature of the first edge, and the inlet portion and / or the outlet portion is located on the side of the cooling pipe opposite to the first edge.

[0016] According to some embodiments of this application, the liquid inlet and / or the liquid outlet protrudes from the second edge.

[0017] According to some embodiments of this application, the cooling pipe is made of copper.

[0018] According to some embodiments of this application, a portion of the structure of the cooling pipe extends along the direction of the cooling pipe toward the stator coil to pass through the stator coil.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram of the base plate assembly in one embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the assembly of the cooling pipe and the base plate assembly in one embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the assembly of the stator coil and the base plate assembly in one embodiment of this application.

[0024] Figure label:

[0025] 100, Base plate assembly; 110, Curved section; 110a, Mounting groove; 110b, First edge; 110c, Second edge; 110d, Curved groove; 110e, Straight groove; 110f, Liquid inlet; 110g, Liquid outlet; 200, Cooling pipe; 200a, Liquid inlet; 200b, Liquid outlet; 300, Stator coil. Detailed Implementation

[0026] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0027] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0028] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0030] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] In related technologies, stator coils are resistive conductors. When the magnetic drive feed line is energized, the stator coils heat up and continuously dissipate heat. The resistance of the stator coils changes at different temperatures, thus affecting the stability of the magnetic drive feed line. When the base plate assembly has a curved section, the radius of curvature on the inner side of the curve is smaller, and the stator coils are more densely packed near the inner side. Therefore, the temperature on the inner side of the curve is higher than the temperature on the outer side. When using room temperature cooling or blower cooling, it is difficult to reduce the temperature on the inner side of the curve to a suitable level, thereby affecting the stability of the magnetic drive feed line.

[0032] In this embodiment, a cooling pipe 200 is provided in the mounting groove 110a, and the projection area of ​​the cooling pipe 200 is partially located within the projection area of ​​the stator coil 300. Passing coolant through the cooling pipe 200 enables water cooling of the stator coil 300, thereby effectively reducing the temperature of the stator coil 300 and minimizing the possibility of instability in the magnetic drive conveyor line.

[0033] This application provides a cooling device; please refer to [link / reference]. Figures 1 to 3 The cooling device is applied to a magnetic drive stator, which includes a stator coil 300. The cooling device includes a base plate assembly 100 and a cooling pipe 200. The base plate assembly 100 includes a curved portion 110 with a mounting groove 110a. The cooling pipe 200 is installed in the mounting groove 110a, and the interior of the cooling pipe 200 is used to circulate coolant. The stator coil 300 is connected to the curved portion 110, and at least a portion of the structure of the stator coil 300 extends along the curve and is projected along the arrangement direction of the base plate assembly 100 and the stator coil 300. The projection area of ​​the cooling pipe 200 at least partially overlaps with the projection area of ​​the stator coil 300.

[0034] For example, the curved portion 110 is an arc. The length direction of the curved portion 110 is an arc.

[0035] For example, there are multiple stator coils 300, which are spaced apart along the length of the curved portion 110.

[0036] For example, the base plate assembly 100 and the stator coil 300 are arranged in a vertical direction.

[0037] In this embodiment, the base plate assembly 100 includes a curved portion 110 with a mounting groove 110a, to which the stator coil 300 is connected. When the magnetic drive conveyor is in operation for an extended period, the stator coil 300 generates heat. The stator coil 300 is more tightly packed on the inward side of the curved portion 110, resulting in a higher temperature on the inner side of the curved portion 110. A cooling pipe 200 is installed within the mounting groove 110a of the curved portion 110, with its projection area partially located within the projection area of ​​the stator coil 300. When coolant is introduced into the cooling pipe 200, it cools the stator coil 300, mitigating the temperature rise and reducing the impact of high temperatures on the stability of the magnetic drive conveyor.

[0038] It is understandable that the arrangement of the cooling pipes 200 in the base plate assembly 100 and the smoothness of their flow will affect the cooling capacity of the cooling pipes 200 to the stator coil 300 to some extent.

[0039] It is understood that the base plate assembly 100 also includes a straight section and the number of curved sections 110 can be multiple. By splicing the straight section and the curved section 110 together, the base plate assembly 100 can be formed into a closed shape so that the mover can move cyclically along the extension direction of the base plate assembly 100 under the drive of the stator coil 300.

[0040] In one embodiment, please refer to Figure 1 The mounting groove 110a includes multiple curved grooves 110d and multiple straight grooves 110e, with two adjacent straight grooves 110e connected through their corresponding curved grooves 110d.

[0041] For example, when the curved portion 110 is an arc, the length direction of the stator coil 300 and the straight groove 110e are arranged radially along the curved portion 110.

[0042] In the embodiment of this application, the straight grooves 110e are connected by the curved grooves 110d. The cooling pipe 200 has a smaller obstruction effect on the coolant, so the coolant can flow smoothly in the cooling pipe 200 and flow more quickly in the cooling pipe 200, which can increase the cooling effect of the cooling pipe 200 on the stator coil 300 to a certain extent.

[0043] It is understood that other embodiments of this application are not limited to whether the mounting groove 110a includes the curved groove 110d. Exemplarily, the cooling pipes 200 are interconnected through a plurality of straight grooves 110e.

[0044] It is understandable that the relative position between the cooling pipe 200 and the stator coil 300 will affect the cooling effect of the cooling pipe 200 on the stator coil 300. The larger the area of ​​the cooling pipe 200 below the stator coil 300, the better the cooling effect of the cooling pipe 200 on the stator coil 300.

[0045] In one embodiment, please refer to Figure 3 The mounting groove 110a includes a straight groove 110e, which is projected along the arrangement direction of the curved portion 110 and the stator coil 300. The projection area of ​​the straight groove 110e at least partially overlaps with the projection area of ​​the stator coil 300.

[0046] In the embodiment of this application, a straight groove 110e is arranged below each stator coil 300, and a cooling pipe 200 is installed in the straight groove 110e. The central axis of the stator coil 300 along its length direction coincides with the central axis of the corresponding straight segment. As many cooling pipes 200 as possible are arranged below each stator coil 300 for cooling. The cooling effect of the cooling pipes 200 is good, so that the temperature of the stator coil 300 rises more slowly during operation, further reducing the occurrence of poor stability of the magnetic drive conveyor line.

[0047] It is understandable that the stator coil 300 and the cooling pipe 200 are not in direct contact. A heat transfer medium needs to be provided between the stator coil 300 and the cooling pipe 200 to separate them, thereby preventing the stator coil 300 from conducting current to the cooling pipe 200.

[0048] In one embodiment, the curved portion 110 includes a base plate and a thermally conductive adhesive layer, which together form a mounting groove 110a. At least a portion of the structure of the cooling pipe 200 is located within the thermally conductive adhesive layer, which is located between the stator coil 300 and the base plate. The stator coil 300 is connected to the thermally conductive adhesive layer.

[0049] For example, the thermally conductive adhesive layer is located between the stator coil 300 and the base plate in the vertical direction.

[0050] For example, the thermally conductive adhesive layer is an insulating material, which can be a silicone-based thermally conductive insulating adhesive, an epoxy resin thermally conductive insulating adhesive, or a polyimide thermally conductive insulating adhesive. The side of the thermally conductive adhesive layer facing the stator coil 300 can be milled to make the surface of the thermally conductive adhesive layer smoother, facilitating the connection between the stator coil 300 and the thermally conductive adhesive layer. During the processing, the cooling pipe 200 can be embedded in the receiving groove first, and then the thermally conductive adhesive can be poured on the outside of the cooling pipe 200 so that the thermally conductive adhesive can wrap the cooling pipe 200, thereby accelerating the heat conduction speed between the cooling pipe 200 and the outside.

[0051] In the embodiment of this application, the thermally conductive adhesive layer is located between the stator coil 300 and the base plate. The thermally conductive adhesive layer has good thermal conductivity as a thermally conductive material, which enables the heat of the stator coil 300 to be transferred to the cooling pipe 200 located in the base plate more quickly, and the cooling pipe 200 has a better cooling effect.

[0052] It is understood that other embodiments of this application are not limited to having a thermally conductive adhesive layer between the stator coil 300 and the base plate. Exemplarily, the base plate assembly 100 includes an insulating plate connected to the side of the base plate facing the stator coil 300, and the stator coil 300 is bonded to the insulating plate.

[0053] In one embodiment, please refer to Figure 1 and Figure 2 There are multiple mounting slots 110a, and the multiple mounting slots 110a are isolated from each other.

[0054] For example, there are multiple cooling pipes 200, with adjacent cooling pipes 200 isolated from each other, and each cooling pipe 200 is installed in a corresponding different mounting slot 110a.

[0055] For example, the corresponding cooling pipes 200 within each mounting slot 110a are isolated from each other. Coolant in any one cooling pipe 200 will not flow into other cooling pipes 200.

[0056] In this embodiment, there are multiple mounting slots 110a, and multiple cooling pipes 200 can be provided in the base plate assembly 100. As the coolant flows from one opening of the cooling pipe 200 to another, it gradually absorbs the heat generated by the stator coil 300. The coolant absorbs less heat near the outlet, and the combined cooling of the stator coil 300 connected to the base plate assembly 100 by multiple cooling pipes ensures that all stator coils 300 connected to the base plate assembly 100 are cooled effectively. The temperature among the multiple stator coils 300 is relatively uniform. Furthermore, the isolation between the multiple mounting slots 110a reduces heat exchange between the cooling pipes 200, thereby reducing the reduction in the cooling capacity of the cooling pipes 200.

[0057] It is understood that other embodiments of this application are not limited to having a plurality of mounting slots 110a. Exemplarily, the number of mounting slots 110a may be a single one.

[0058] In one embodiment, please refer to Figure 1 The mounting groove 110a has a liquid inlet 110f and a liquid outlet 110g. In two adjacent mounting grooves 110a, along the length direction of the curved portion 110, the liquid outlet 110g corresponding to one mounting groove 110a is located on the side opposite to the liquid inlet 110f corresponding to the other mounting groove 110a.

[0059] For example, the coolant in the cooling pipe 200 can enter the corresponding cooling pipe 200 from the corresponding position of the inlet 110f to cool the stator coil 300, and then flow out of the cooling pipe 200 from the corresponding position of the outlet 110g. The temperature of the coolant at the outlet 110g is higher than the temperature of the coolant at the inlet 110f.

[0060] In the embodiment of this application, the coolant's temperature rises after absorbing heat generated by the stator coil 300, resulting in a higher temperature of the coolant at the outlet 110g than at the inlet 110f. The proximity of the lower-temperature inlet 110f to the higher-temperature outlet 110g in the two cooling pipes 200 ensures a more uniform temperature distribution across the entire base plate assembly 100 connected to the stator coil 300, thereby reducing the possibility of some stator coils 300 being affected by locally high temperatures.

[0061] It is understood that other embodiments of this application are not limited to the fact that the liquid outlet 110g corresponding to one mounting groove 110a is adjacent to the liquid inlet 110f corresponding to another mounting groove 110a. Exemplarily, the liquid outlets 110g corresponding to two mounting grooves 110a can be arranged adjacent to each other.

[0062] In one embodiment, please refer to Figure 2 The cooling pipe 200 has an inlet portion 200a and an outlet portion 200b. The curved portion 110 has a curved first edge 110b and a curved second edge 110c. The radius of curvature of the second edge 110c is smaller than the radius of curvature of the first edge 110b. The inlet portion 200a and / or the outlet portion 200b are located on the side of the cooling pipe 200 away from the first edge 110b.

[0063] For example, the liquid inlet 200a corresponds to the position of the liquid inlet 110f of the corresponding mounting groove 110a, and the liquid outlet 200b corresponds to the position of the liquid outlet 110g of the corresponding mounting groove 110a.

[0064] For example, the mounting groove 110a is located between the first edge 110b and the second edge 110c.

[0065] For example, when the curved portion 110 is an annulus, both the first edge 110b and the second edge 110c are arcs. The radius of curvature of the first edge 110b is the radius of the arc corresponding to the first edge 110b, and the radius of curvature of the second edge 110c is the radius of the arc corresponding to the second edge 110c. The second edge 110c corresponds to the inner edge of the curved portion 110, and the first edge 110b corresponds to the outer edge of the curved portion 110.

[0066] In the embodiment of this application, because the radius of curvature of the second edge 110c is small, the heat generated by the stator coil 300 is more concentrated at the second edge 110c. The cooling pipe 200 extends from the second edge 110c into the interior of the base plate assembly 100. The second edge 110c is located inside the curved portion 110. During the flow of coolant through the cooling pipe 200, the coolant can cool the inside of the curved portion 110, thereby cooling the higher-temperature parts of the base plate assembly 100, resulting in a more uniform temperature distribution throughout the base plate assembly 100. Furthermore, both the inlet portion 200a and the outlet portion 200b are located on the side close to the second edge 110c. The process of filling the inlet portion 200a with coolant and the process of receiving coolant at the outlet portion 200b can both be completed inside the curved portion 110, thereby reducing the space occupied by the inlet and outlet processes.

[0067] It is understood that other embodiments of this application are not limited to the liquid inlet 200a and liquid outlet 200b being located on the side of the cooling pipe 200 away from the first edge 110b. For example, both the liquid inlet 200a and liquid outlet 200b are located on the side of the cooling pipe 200 away from the second edge 110c.

[0068] In one embodiment, please refer to Figure 2 The liquid inlet 200a and / or the liquid outlet 200b protrude from the second edge 110c.

[0069] In the embodiments of this application, during the process of coolant entering and exiting the cooling pipe 200, the inlet portion 200a and the outlet portion 200b protruding from the second edge 110c can reduce the amount of coolant flowing out of the cooling pipe 200 to a certain extent, and can also reduce the amount of coolant entering the base plate assembly 100 from the cooling pipe 200. Furthermore, external pipelines can be easily connected to the inlet portion 200a and the outlet portion 200b, so that coolant can flow into and out of the cooling pipe 200.

[0070] It is understood that other embodiments of this application are not limited to the liquid inlet 200a and / or liquid outlet 200b protruding from the second edge 110c. Exemplarily, both the liquid inlet 200a and the liquid outlet 200b are located between the first edge 110b and the second edge 110c.

[0071] It is understandable that the material of the cooling pipe 200 will affect its cooling effect. The better the thermal conductivity of the material of the cooling pipe 200, the better its cooling effect.

[0072] In one embodiment, the cooling pipe 200 is made of copper.

[0073] In the embodiments of this application, the cooling pipe 200 is made of copper, which enables the cooling pipe 200 to have high strength, long service life, and high thermal conductivity.

[0074] It is understood that other embodiments of this application do not limit the material of the cooling pipe 200. For example, the material of the cooling pipe 200 may be EPDM rubber, polyolefin, or polyurethane.

[0075] In one embodiment, a portion of the structure of the cooling pipe 200 extends along the direction of the cooling pipe 200 toward the stator coil 300 to pass through the stator coil 300.

[0076] For example, there are two base plate assemblies 100, which are arranged in a vertical direction. The stator coil 300 is located between the two base plate assemblies 100 in a vertical direction. Both base plate assemblies 100 have mounting slots 110a that can accommodate cooling pipes 200. The cooling pipes 200 extend in a vertical direction in a portion of their structure, and the cooling pipes 200 can extend from the mounting slots 110a of one base plate assembly 100 to the mounting slots 110a of the other base plate assembly 100.

[0077] In the embodiment of this application, the cooling pipe 200 extends partially along the direction of the cooling pipe 200 toward the stator coil 300 to pass through the stator coil 300, which can further improve the cooling effect of the cooling pipe 200 on the stator coil 300, thereby reducing the situation where the stator coil 300 is unstable in operation due to high temperature.

[0078] It is understood that other embodiments of this application do not limit whether the cooling section extends along the cooling pipe 200 toward the stator coil 300.

[0079] This application also provides a magnetic drive stator, which includes a stator coil 300 connected to a cooling device of any of the above.

[0080] This application also provides a magnetic drive conveyor line, including any of the above-described magnetic drive stator and mover. The mover is disposed above the stator coil 300, and the mover can move under the drive of the magnetic force generated by the stator coil 300.

[0081] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of the specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of protection.

Claims

1. A cooling device, characterized in that, Applied to a magnetic drive stator, the magnetic drive stator including stator coils, the cooling device includes: A base plate assembly includes a curved portion having a mounting groove; A cooling pipe is installed in the mounting groove, and the interior of the cooling pipe is used to circulate coolant; a stator coil is connected to the curved section, and at least a portion of the structure of the stator coil extends along the curve and is projected along the arrangement direction of the base plate assembly and the stator coil, and the projection area of ​​the cooling pipe at least partially overlaps with the projection area of ​​the stator coil.

2. The cooling device according to claim 1, characterized in that, The curved section includes a base plate and a thermally conductive adhesive layer. The base plate and the thermally conductive adhesive layer form a mounting groove. At least a portion of the structure of the cooling pipe is located within the thermally conductive adhesive layer. The thermally conductive adhesive layer is located between the stator coil and the base plate. The stator coil is connected to the thermally conductive adhesive layer.

3. The cooling device according to claim 1 or 2, characterized in that, The number of mounting slots is multiple, and the multiple mounting slots are isolated from each other.

4. The cooling device according to claim 1 or 2, characterized in that, The mounting groove includes multiple curved grooves and multiple straight grooves, with adjacent straight grooves connected by their corresponding curved grooves.

5. The cooling device according to claim 4, characterized in that, Projecting along the arrangement direction of the curved portion and the stator coils, the projection area of ​​the straight groove at least partially overlaps with the projection area of ​​the stator coils.

6. The cooling device according to claim 5, characterized in that, The mounting slot has a liquid inlet and a liquid outlet. In two adjacent mounting slots, along the length of the curved portion, the liquid outlet of one mounting slot is located on the side opposite to the liquid inlet of the other mounting slot.

7. The cooling device according to claim 1 or 2, characterized in that, The cooling pipe has an inlet and an outlet, and the curved portion has a curved first edge and a curved second edge. The radius of curvature of the second edge is smaller than that of the first edge. The inlet and / or the outlet are located on the side of the cooling pipe away from the first edge.

8. The cooling device according to claim 7, characterized in that, The liquid inlet and / or the liquid outlet protrudes from the second edge.

9. The cooling device according to claim 1 or 2, characterized in that, The cooling pipe is made of copper.

10. The cooling device according to claim 1 or 2, characterized in that, A portion of the structure of the cooling pipe extends along the direction of the cooling pipe toward the stator coil to pass through the stator coil.

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