Stator assembly of an electric machine and electric machine

Abstract

The utility model provides a kind of stator assembly and motor of motor, including stator core and cooling structure, wherein, the inner periphery of stator core is wound with stator winding;Cooling structure is located at the at least part outer periphery of stator core, to at least be used to take away the heat generated by stator winding.The utility model solves the main problem that water-cooled motor in the prior art faces is that cooling efficiency is not high, volume is too large, manufacturing cost is high and the problem of poor heat conduction effect.

Description

Technical Field

[0001] This utility model relates to the field of motor cooling technology, and more specifically, to a stator assembly and a motor. Background Technology

[0002] In the field of motor cooling technology, water cooling has become one of the key methods for heat dissipation in high-power motors. During operation, especially under high load and high temperature environments, motors generate a large amount of heat. Effective heat dissipation measures are crucial for ensuring motor stability and extending its service life. Currently, existing water-cooled motors mainly use internal water channels within the casing for cooling. While this method provides some heat dissipation, it has some obvious limitations and problems.

[0003] 1) Limited cooling efficiency: In existing water-cooled housing designs, the water channels are far from the stator core, preventing direct and efficient heat exchange and thus limiting cooling performance. The stator windings, as the primary source of heat during motor operation, cannot quickly dissipate this heat, affecting the overall performance of the motor.

[0004] 2) Space Occupancy and Volume Constraints: Water-cooled housings require additional water channel structures, which undoubtedly increases the overall size and weight of the motor. As the market demands smaller and lighter motors, traditional water-cooled housing designs are clearly unable to meet this trend.

[0005] 3) Process complexity and cost: The existing manufacturing process of water-cooled housings is relatively complex, requiring precise molds and processing equipment. At the same time, it also requires meticulous operation during assembly, which not only increases manufacturing costs but also extends the product development cycle to some extent.

[0006] 4) Poor heat conduction: There is often an air gap between the stator core and the housing, which greatly reduces the heat conduction efficiency. Although the water-cooled housing can provide a certain degree of cooling, the actual heat dissipation performance is not ideal due to the obstructed heat conduction path.

[0007] In summary, the main problems faced by existing water-cooled motors are low cooling efficiency, excessive size, high manufacturing cost, and poor heat conduction. These issues, to some extent, limit the application scope and development potential of high-power motors. Therefore, how to improve cooling efficiency and reduce costs while maintaining motor size has become a key technical problem that urgently needs to be solved in the field of motor design. Utility Model Content

[0008] The main objective of this invention is to provide a stator assembly and a motor to address the main problems faced by existing water-cooled motors, such as low cooling efficiency, excessive size, high manufacturing cost, and poor heat conduction.

[0009] To achieve the above objectives, this utility model provides a stator assembly for an electric motor, including a stator core and a cooling structure, wherein a stator winding is wound around the inner circumferential surface of the stator core; the cooling structure is located on at least a portion of the outer circumferential surface of the stator core to at least remove the heat generated by the stator winding.

[0010] In one exemplary embodiment, the cooling structure is detachably connected to the stator core.

[0011] In one exemplary embodiment, the cooling structure is bonded to at least a portion of the outer peripheral surface of the stator core.

[0012] In an exemplary embodiment, a plurality of limiting protrusions are provided on the outer peripheral surface of the stator core. Each limiting protrusion extends along the axial direction of the stator core, and the length of each limiting protrusion in the axial direction of the stator core is less than the axial length of the stator core. The end of one of two adjacent limiting protrusions is connected to the first axial end of the stator core, and the end of the other limiting protrusion in the two adjacent limiting protrusions is connected to the second axial end of the stator core, so that the plurality of limiting protrusions are staggered on the outer peripheral surface of the stator core. The cooling structure is annular and has a plurality of limiting notches for cooperating with the plurality of limiting protrusions. The plurality of limiting notches are staggered at both ends of the cooling structure, so that the cooling channel of the cooling structure extends in a serpentine manner.

[0013] In one exemplary embodiment, the cooling structure has an inlet and an outlet for communicating with a cooling channel, and the inlet and outlet are located on the same axial side of the stator core.

[0014] In one exemplary embodiment, the inlet and outlet are located on opposite sides of the same limiting notch in the circumferential direction of the cooling structure.

[0015] In one exemplary embodiment, the total axial length of the cooling structure is equal to the total axial length of the stator core.

[0016] In one exemplary embodiment, the total axial length of the cooling structure is greater than the total axial length of the stator core, and at least one of the two axial ends of the cooling structure extends beyond the axial end of the stator core, such that the cooling structure extending beyond the axial end of the stator core extends to at least a portion of the stator winding.

[0017] In one exemplary embodiment, the cooling structure is a flat structure.

[0018] According to another aspect of the present invention, an electric motor is provided, including a stator assembly, wherein the stator assembly is the stator assembly described above.

[0019] The present invention provides a stator assembly for an electric motor, comprising a stator core and a cooling structure, wherein a stator winding is wound around the inner circumferential surface of the stator core; the cooling structure is located on at least a portion of the outer circumferential surface of the stator core to at least remove heat generated by the stator winding.

[0020] By placing the cooling structure on at least a portion of the outer peripheral surface of the stator core, the heat dissipation contact area between the cooling structure and the outer peripheral surface of the stator core is increased. Furthermore, by placing the cooling structure directly on at least a portion of the outer peripheral surface of the stator core, the coolant within the cooling structure can quickly remove the heat generated by the stator windings, thereby effectively reducing the operating temperature of the motor. This improves the motor's heat dissipation efficiency and ensures stable operation of the motor under high load and high temperature conditions. This design plays a crucial role, especially in electric vehicles, industrial equipment, aerospace, and other fields, particularly in applications requiring high power density and high efficiency, ensuring that the heat inside the motor is removed in a timely manner. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 A partial structural schematic diagram of a stator assembly according to Embodiment 1 of the present invention is shown;

[0023] Figure 2 It shows Figure 1 A schematic diagram of the stator core and stator windings of the stator assembly;

[0024] Figure 3 It shows Figure 1 A schematic diagram of the stator core and stator windings of the stator assembly from an axial top view.

[0025] Figure 4 It shows Figure 1 A schematic diagram of the cooling structure of the stator assembly in the middle;

[0026] Figure 5 A partial structural schematic diagram of the stator assembly according to Embodiment 2 of the present invention is shown;

[0027] Figure 6 It shows Figure 5 A schematic diagram of the stator assembly from another perspective.

[0028] The above figures include the following reference numerals:

[0029] 10. Stator core; 11. Limiting protrusion;

[0030] 20. Stator windings;

[0031] 30. Cooling structure; 31. Limiting notch; 32. Liquid inlet; 33. Liquid outlet. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] To address the main problems of existing water-cooled motors, such as low cooling efficiency, excessive size, high manufacturing cost, and poor heat conduction, this invention provides a stator assembly and a motor, wherein the motor includes a stator assembly, which is the stator assembly described above and below.

[0034] Example 1

[0035] like Figures 1 to 4 As shown, the stator assembly of the motor includes a stator core 10 and a cooling structure 30, wherein a stator winding 20 is wound around the inner circumferential surface of the stator core 10; the cooling structure 30 is located on at least a portion of the outer circumferential surface of the stator core 10 to at least remove the heat generated by the stator winding 20.

[0036] By placing the cooling structure 30 on at least a portion of the outer peripheral surface of the stator core 10, the heat dissipation contact area between the cooling structure 30 and the outer peripheral surface of the stator core 10 is increased. Furthermore, by placing the cooling structure 30 directly on at least a portion of the outer peripheral surface of the stator core 10, the coolant within the cooling structure 30 can quickly remove the heat generated by the stator winding 20, thereby effectively reducing the temperature during motor operation. This improves the motor's heat dissipation efficiency and ensures stable operation of the motor under high load and high temperature conditions. This design plays a crucial role, especially in electric vehicles, industrial equipment, aerospace, and other fields, particularly in applications requiring high power density and high efficiency, ensuring that the heat inside the motor is removed in a timely manner.

[0037] It should be noted that in this application, the material, length, area, cross-sectional shape, and other dimensions of the cooling structure 30 can be adjusted to accommodate stator cores 10 of different diameters and lengths. By adjusting the dimensions and material properties of the cooling structure 30 to match stator cores 10 of different specifications, optimal heat dissipation is achieved, improving the versatility and flexibility of the cooling structure 30. This allows for rapid adaptation to different types of motors, shortening product development cycles and reducing production costs. Application scenarios include the manufacturing and maintenance of various motors. The cooling structure 30 can be customized according to the specific parameters of the motor and the operating environment to meet specific heat dissipation requirements.

[0038] It should be noted that, in this embodiment, the stator winding 20 of the stator assembly of the motor with an internal rotor is mainly referred to as the inner circumferential surface of the stator core 10.

[0039] It should be noted that in this application, the cooling structure 30 is detachably connected to the stator core 10. This ensures ease of installation and disassembly between the cooling structure 30 and the stator core 10.

[0040] Furthermore, the cooling structure 30 is bonded to at least a portion of the outer peripheral surface of the stator core 10. This surface-mounting of the cooling structure 30 to at least a portion of the outer peripheral surface of the stator core 10 enhances its reliability. By firmly fixing the cooling structure 30 to the stator surface, the impact of motor vibration on the cooling structure 30 is avoided, improving its stability and durability. The effect is that even when the motor encounters severe vibration during operation, the cooling structure 30 is less prone to displacement or damage, ensuring its normal operation and extending the motor's service life. Application scenarios include electric vehicles, heavy machinery, and other equipment requiring significant vibration resistance; this design ensures the reliability and stability of the water-cooling system.

[0041] like Figures 1 to 4As shown, a plurality of limiting protrusions 11 are provided on the outer peripheral surface of the stator core 10. Each limiting protrusion 11 extends along the axial direction of the stator core 10, and the length of each limiting protrusion 11 in the axial direction of the stator core 10 is less than the axial length of the stator core 10. The end of one of two adjacent limiting protrusions 11 is connected to the first axial end of the stator core 10, and the end of the other limiting protrusion 11 in the adjacent two limiting protrusions 11 is connected to the second axial end of the stator core 10, so that the plurality of limiting protrusions 11 are staggered on the outer peripheral surface of the stator core 10. The cooling structure 30 is annular, and the annular cooling structure 30 has a plurality of limiting notches 31 for cooperating with the plurality of limiting protrusions 11. The plurality of limiting notches 31 are staggered at both ends of the axial direction of the cooling structure 30, so that the cooling channel of the cooling structure 30 extends in a serpentine manner. In this way, the cooperation between the limiting protrusion 11 and the limiting notch 31 ensures that the cooling channel of the cooling structure 30 extends in a serpentine shape, while also ensuring the uniformity of heat exchange in the cooling channel.

[0042] like Figure 1 and Figure 4 As shown, the cooling structure 30 has an inlet 32 ​​and an outlet 33 for communicating with the cooling channel, and the inlet 32 ​​and outlet 33 are located on the same axial side of the stator core 10. This design of the inlet 32 ​​and outlet 33 can accelerate the circulation speed of the coolant and improve heat exchange efficiency. By optimizing the position and structure of the inlet 32 ​​and outlet 33, the flow state of the coolant in the cooling structure 30 is improved, accelerating heat transfer. During motor operation, the coolant circulation is smoother, the heat exchange efficiency is higher, and the motor temperature drops rapidly. This design is suitable for high-performance motors, high-speed motors, and other applications with strict requirements for heat dissipation efficiency. This design can significantly improve the operating stability and efficiency of the motor.

[0043] like Figure 1 and Figure 4 As shown, the liquid inlet 32 ​​and the liquid outlet 33 are located on both sides of the same limiting notch 31 in the circumferential direction of the cooling structure 30.

[0044] like Figure 4 As shown, the cooling structure 30 has a flat structure. By making the cooling structure 30 flat, on the one hand, it is beneficial to increase the contact area between the cooling channel of the cooling structure 30 and the stator core 10, thereby ensuring the heat exchange reliability of the cooling structure 30; on the other hand, it is beneficial to avoid the cooling structure 30 occupying the radial space of the motor stator assembly, thereby facilitating the compact design of the stator assembly and further promoting the miniaturization design of the stator assembly.

[0045] It should be noted that, in this embodiment, as Figures 1 to 4As shown, the total axial length of the cooling structure 30 is equal to the total axial length of the stator core 10. This helps to ensure the overall vibration resistance of the stator assembly.

[0046] Example 2

[0047] It should be noted that the difference between this embodiment and Embodiment 1 is that, as shown in the following... Figure 5 and Figure 6 As shown, the total axial length of the cooling structure 30 is greater than the total axial length of the stator core 10, and at least one end of the cooling structure 30 extends beyond the axial end of the stator core 10, so that the cooling structure 30 extending beyond the axial end of the stator core 10 extends to at least a portion of the stator winding 20. This allows at least one end of the cooling structure 30 to extend beyond the axial end of the stator core 10 and to the stator winding 20, maintaining a consistent shape for the stator core 10. The stator lamination die and stator stacking process are simpler and less costly compared to Embodiment 1.

[0048] Furthermore, in a specific embodiment of this application, such as Figure 5 and Figure 6 As shown, the axial ends of the cooling structure 30 extend out of the axial ends of the stator core 10, respectively.

[0049] It should be noted that in one embodiment of this application (not shown), the difference between this embodiment and Embodiment 1 is that the stator assembly of the motor includes a stator core 10 and a cooling structure 30, wherein a stator winding 20 is wound around the outer peripheral surface of the stator core 10; the cooling structure 30 is located on at least a portion of the inner peripheral surface of the stator core 10 to at least remove the heat generated by the stator winding 20.

[0050] By placing the cooling structure 30 on at least a portion of the inner circumferential surface of the stator core 10, the heat dissipation contact area between the cooling structure 30 and the inner circumferential surface of the stator core 10 is increased. Furthermore, by placing the cooling structure 30 directly on the inner circumferential surface of the stator core 10, the coolant within the cooling structure 30 can quickly remove the heat generated by the stator winding 20, thereby effectively reducing the operating temperature of the motor. This improves the motor's heat dissipation efficiency and ensures stable operation of the motor under high load and high temperature conditions. This design plays a crucial role, especially in electric vehicles, industrial equipment, aerospace, and other fields, particularly in applications requiring high power density and high efficiency, ensuring that the heat inside the motor is removed in a timely manner.

[0051] It should be noted that in this application, the material, length, area, cross-sectional shape, and other dimensions of the cooling structure 30 can be adjusted to accommodate stator cores 10 of different diameters and lengths. By adjusting the dimensions and material properties of the cooling structure 30 to match stator cores 10 of different specifications, optimal heat dissipation is achieved, improving the versatility and flexibility of the cooling structure 30. This allows for rapid adaptation to different types of motors, shortening product development cycles and reducing production costs. Application scenarios include the manufacturing and maintenance of various motors. The cooling structure 30 can be customized according to the specific parameters of the motor and the operating environment to meet specific heat dissipation requirements.

[0052] It should be noted that, in this embodiment, the stator winding 20 of the stator assembly of the motor with an external rotor is wound on the outer circumferential surface of the stator core 10.

[0053] It should be noted that in this application, the cooling structure 30 is detachably connected to the stator core 10. This ensures ease of installation and disassembly between the cooling structure 30 and the stator core 10.

[0054] Furthermore, the cooling structure 30 is bonded to the inner circumferential surface of the stator core 10. This surface-mounting of the cooling structure 30 to the inner circumferential surface of the stator core 10 enhances its reliability. By firmly fixing the cooling structure 30 to the stator surface, the impact of motor vibration on the cooling structure 30 is avoided, improving its stability and durability. The effect is that even under severe vibration during motor operation, the cooling structure 30 is less prone to displacement or damage, ensuring its normal operation and extending the motor's lifespan. Application scenarios include electric vehicles, heavy machinery, and other equipment requiring significant vibration resistance; this design ensures the reliability and stability of the water-cooling system.

[0055] Similarly, considering that it is not convenient to install the cooling structure 30 on the inner circumferential surface of the stator core 10, preferably, a plurality of limiting protrusions 11 are provided on the inner circumferential surface of the stator core 10. Each limiting protrusion 11 extends along the axial direction of the stator core 10, and the length of each limiting protrusion 11 in the axial direction of the stator core 10 is less than the axial length of the stator core 10. The end of one of two adjacent limiting protrusions 11 is connected to the first axial end of the stator core 10, and the end of the other limiting protrusion 11 is connected to the second axial end of the stator core 10, so that the plurality of limiting protrusions 11 are staggered on the inner circumferential surface of the stator core 10. The cooling structure 30 includes a sub-cooling unit. The sub-cooling unit has an annular flow channel structure and multiple axial flow channel structures. Each axial flow channel structure is connected to one axial end of the annular flow channel structure. The annular flow channel structure has an annular flow channel, and each axial flow channel structure has a first sub-flow channel and a second sub-flow channel that are parallel to each other. The first end of the first sub-flow channel serves as an inlet and communicates with the annular flow channel; the second end of the first sub-flow channel communicates with the first end of the second sub-flow channel; and the second end of the second sub-flow channel serves as an outlet and communicates with the annular flow channel. A limiting notch 31 is formed between adjacent axial flow channel structures to cooperate with the limiting protrusion 11. There are two sub-cooling units, which are staggered and inserted into the inner circumferential surface of the stator core 10 along its axial ends. In this way, the cooperation of the limiting protrusion 11 and the limiting notch 31 ensures that the cooling channel of the cooling structure 30 extends in a serpentine shape while also ensuring the uniformity of heat transfer in the cooling channel.

[0056] Furthermore, the annular flow channel structure has an inlet and an outlet for communicating with the annular flow channel, and the inlet and outlet are located on the same side of the axial direction of the annular flow channel structure. This design of the inlet and outlet accelerates the circulation speed of the coolant and improves heat exchange efficiency. By optimizing the position and structure of the inlet and outlet, the flow state of the coolant in the cooling structure 30 is improved, accelerating heat transfer. During motor operation, the coolant circulation is smoother, the heat exchange efficiency is higher, and the motor temperature drops rapidly. This design is suitable for high-performance motors, high-speed motors, and other applications with strict requirements for heat dissipation efficiency. This design can significantly improve the operating stability and efficiency of the motor.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0059] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0060] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0061] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stator assembly for an electric motor, characterized in that, include: Stator core (10), wherein a stator winding (20) is wound around the inner circumferential surface of the stator core (10); A cooling structure (30) is located on at least a portion of the outer peripheral surface of the stator core (10) to at least remove heat generated by the stator windings (20).

2. The stator assembly according to claim 1, characterized in that, The cooling structure (30) is detachably connected to the stator core (10).

3. The stator assembly of claim 1, wherein, The cooling structure (30) is bonded to at least a portion of the outer peripheral surface of the stator core (10).

4. The stator assembly according to claim 1, characterized in that, The stator core (10) has a plurality of limiting protrusions (11) protruding from its outer peripheral surface. Each limiting protrusion (11) extends along the axial direction of the stator core (10), and the length of each limiting protrusion (11) in the axial direction of the stator core (10) is less than the axial length of the stator core (10). One end of one of the two adjacent limiting protrusions (11) is connected to the first axial end of the stator core (10), and the other end of the two adjacent limiting protrusions (11) is connected to the second axial end of the stator core (10), so that the multiple limiting protrusions (11) are staggered on the outer peripheral surface of the stator core (10); The cooling structure (30) is annular and has multiple limiting notches (31) for cooperating with multiple limiting protrusions (11). The multiple limiting notches (31) are staggered at both ends of the cooling structure (30) so that the cooling channel of the cooling structure (30) extends in a serpentine manner.

5. The stator assembly according to claim 4, characterized in that, The cooling structure (30) has an inlet (32) and an outlet (33) for communicating with the cooling channel, and the inlet (32) and the outlet (33) are located on the same side of the axial direction of the stator core (10).

6. The stator assembly according to claim 5, characterized in that, The liquid inlet (32) and the liquid outlet (33) are located on the same limiting notch (31) on both sides of the circumferential direction of the cooling structure (30).

7. The stator assembly according to claim 1, characterized in that, The total axial length of the cooling structure (30) is equal to the total axial length of the stator core (10).

8. The stator assembly of claim 1, wherein, The total axial length of the cooling structure (30) is greater than the total axial length of the stator core (10), and at least one end of the cooling structure (30) extends out of the axial end of the stator core (10) so that the cooling structure (30) extending out of the axial end of the stator core (10) extends to at least part of the stator winding (20).

9. The stator assembly according to any one of claims 1 to 8, characterized in that, The cooling structure (30) is a flat structure.

10. An electric motor, characterized in that, Includes a stator assembly, said stator assembly being the stator assembly according to any one of claims 1 to 9.

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