Motor stator and motor

Abstract

The application provides a motor stator and a motor. The motor stator comprises a stator core (1) provided with a winding mounting groove (11); a winding partially accommodated in the winding mounting groove (11), the winding comprising a plurality of wires (2), and a plurality of the wires (2) are arranged along a radial direction (R) of the motor stator in the winding mounting groove (11); and an elastic member (3) arranged in the winding mounting groove (11), the elastic member (3) is arranged between at least two adjacent wires (2) in an axial direction (A) of the motor stator, and an inner part of the elastic member (3) forms one or more cooling oil channels.

Description

Technical Field

[0001] This application relates to an electric motor stator and an electric motor. Background Technology

[0002] In existing technologies, the stator of an electric vehicle motor can be cooled using an oil cooling system, where the cooling oil can directly contact the conductors for better heat transfer. Therefore, some researchers have recently proposed the concept of slot cooling, which involves pushing cooling oil through the stator lamination slots.

[0003] CN116802750A discloses a flat copper wire and winding for an electric motor, in which slots are formed on the surface of the flat copper wire to serve as cooling channels for cooling oil. However, such flat copper wire requires special machines to process it into a special cross-sectional shape, which will cost a lot of time and money. In addition, the slots can damage the insulation film on the surface of the flat copper wire, especially during the process of forming the flat copper wire into a winding, which can lead to quality problems.

[0004] CN109617319A discloses an in-slot oil-cooling structure for a flat wire motor, wherein the stator core is provided with stator slots, and a concave-convex structure is provided through the stator slots to separate the windings within the stator slots, forming in-slot cooling oil passages for cooling oil to pass through. However, the in-slot cooling oil passages occupy the space of the stator slots, which reduces the motor's torque and power. In addition, the number of in-slot cooling oil passages is limited, and only the two wires adjacent to the in-slot cooling oil passages are in direct contact with the cooling oil, resulting in differences in the cooling effect of different wires. Utility Model Content

[0005] This application aims to provide a motor stator and motor to solve or alleviate the problems existing in the prior art.

[0006] An embodiment of this application provides a motor stator, comprising:

[0007] Stator core, wherein the stator core is provided with winding mounting slots;

[0008] A winding, partially received in a winding mounting slot, the winding including a plurality of conductors having a plurality of conductors arranged radially along the motor stator in the winding mounting slot; and

[0009] An elastic element is disposed in the winding mounting slot. When viewed along the axial direction of the motor stator, the elastic element is disposed between at least two adjacent conductors, and one or more cooling oil channels are formed inside the elastic element.

[0010] In at least one possible implementation, the elastic element is a hollow, closed annular structure, the hollow portion of the elastic element forms the cooling oil channel, and one or two cooling oil channels are formed inside the elastic element.

[0011] In at least one possible implementation, the elastic element includes two pressure-receiving portions and two extrusion deformation portions. The pressure-receiving portions are flat, and the extrusion deformation portions are U-shaped. The pressure-receiving portions and the extrusion deformation portions are connected. The two pressure-receiving portions are arranged opposite each other along the radial direction of the motor stator, and the two extrusion deformation portions are arranged opposite each other. The two pressure-receiving portions are in contact with the wires, and the two extrusion deformation portions are respectively connected to the two ends of the two pressure-receiving portions.

[0012] In at least one possible implementation, in the natural state where the elastic element is not compressed, the distance between the two compressed portions is greater than the distance between the two arms of the U-shape of the compressed deformation portion.

[0013] In at least one possible implementation, a cooling oil passage is formed between the extruded deformation portion and the conductor, and / or a cooling oil passage is formed between the extruded deformation portion and the inner wall of the winding mounting groove.

[0014] In at least one possible implementation, the elastic member is provided between the bottom of the winding mounting slot and the wire, thereby forming the cooling oil passage between the bottom of the winding mounting slot and the wire; and / or

[0015] The motor stator also includes a winding fixing member, which is installed at the opening of the winding mounting slot. The winding fixing member can squeeze the wire and the elastic member in the winding mounting slot, thereby fixing the wire and the elastic member in the winding mounting slot. The elastic member is provided between the winding fixing member and the wire, thereby forming the cooling oil passage between the winding fixing member and the wire.

[0016] In at least one possible implementation, one of the elastic elements is provided between every two of the said wires.

[0017] In at least one possible implementation, the elastic element is made of a non-metallic polymer material or carbon fiber, and the elastic element is manufactured by an extrusion molding process; and / or

[0018] The cross-section of the conductor is rectangular.

[0019] In at least one possible implementation, the width of the elastic element is less than or equal to the width of the conductor in the circumferential direction of the motor stator.

[0020] The embodiments of this application also propose an electric motor, which includes the motor stator described in any of the above technical solutions.

[0021] By adopting the above technical solution, cooling oil channels are formed between adjacent conductors in the winding mounting slot through the hollow structure of the elastic element, enhancing the heat dissipation effect of the conductors. Furthermore, since the elastic element occupies less space in the winding mounting slot, it can provide more space for the conductors, thereby optimizing the winding layout and density. Simultaneously, this allows the motor to achieve higher power output and better heat dissipation performance within the same volume, improving the overall performance and efficiency of the motor and extending its service life. Attached Figure Description

[0022] Figure 1 A cross-sectional view of an electric motor stator according to an embodiment of this application is shown.

[0023] Figure 2 It shows Figure 1 A magnified view of a portion of the image.

[0024] Figure 3 A schematic diagram of the structure of the elastic element of an electric motor stator according to an embodiment of this application is shown.

[0025] Figure 4 A schematic diagram of the structure of the elastic element of the motor stator according to an embodiment of this application in its natural state without being compressed is shown.

[0026] Figure 5 A schematic diagram of the structure of the elastic element of the motor stator after being compressed and deformed according to an embodiment of this application is shown.

[0027] Figure 6 A schematic diagram of the structure of a motor stator according to an embodiment of this application is shown in which no wires are installed in some of the winding mounting slots.

[0028] Figure 7 A schematic diagram of the structure of a motor stator according to an embodiment of this application in the state without the winding fixing member installed is shown.

[0029] Figure 8 A partially enlarged cross-sectional view of an electric motor stator according to an embodiment of this application is shown.

[0030] Explanation of reference numerals in the attached figures

[0031] 100 stators

[0032] 1 stator core 11 winding mounting slot

[0033] 2 wires

[0034] 3. Elastic element 31. Compression part 32. Extrusion deformation part

[0035] 4. Winding fixing components

[0036] 5. Insulating paper

[0037] L Cooling oil passage

[0038] Axial direction C circumferential direction R radial direction Detailed Implementation

[0039] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0040] In this application, the axial direction refers to the axial direction A of the motor stator 100 (stator core 1), and the radial direction refers to the radial direction R of the motor stator 100 (stator core 1). The inner radial direction refers to the side on the radial direction R that is closer to the central axis of the motor stator 100 (stator core 1), and the outer radial direction refers to the side on the radial direction R that is farther away from the central axis of the motor stator 100 (stator core 1).

[0041] like Figures 1 to 8 As shown, an embodiment of this application proposes an electric motor, which includes a motor stator 100 and a rotor (not shown), the rotor being rotatable relative to the motor stator 100, and the rotor being located radially inside the motor stator 100.

[0042] like Figure 1 , Figure 2 , Figures 6 to 8 As shown, the motor stator 100 includes a stator core 1, windings, elastic elements 3, winding fixing elements 4, and insulating paper 5.

[0043] The stator core 1 can be cylindrical, and multiple winding mounting slots 11 can be provided on the inner circumference of the stator core 1. The winding mounting slots 11 can penetrate the stator core 1 along the axial direction A, and the multiple winding mounting slots 11 can be evenly arranged along the circumferential direction C of the stator core 1. The winding can be partially accommodated in the winding mounting slots 11, and the winding mounting slots 11 can accommodate the middle part of the winding. The two ends of the winding can protrude from the stator core 1 to form end windings.

[0044] The winding may include multiple conductors 2, and multiple conductors 2 can be set in a winding mounting slot 11. The multiple conductors 2 can be arranged along the radial direction R of the stator core 1 (i.e., the depth direction of the winding mounting slot 11).

[0045] like Figure 2 , Figures 6 to 8 As shown, the cross-section of conductor 2 can be rectangular (including rounded rectangles). Conductor 2 can be wrapped with insulating paper 5, so that conductor 2 and stator core 1 are insulated from each other and adjacent conductors 2.

[0046] In the winding mounting groove 11, the elastic element 3 can be disposed between at least two adjacent conductors 2 of the winding, so that the conductors 2 can press against each other and / or press against the wall of the winding mounting groove 11, thereby fixing the winding in the winding mounting groove 11.

[0047] One or more cooling oil channels can be formed inside the elastic element 3. The elastic element 3 can space two adjacent wires 2 and form a cooling oil channel L between the two adjacent wires 2. See also Figure 2 and Figure 3 Observing along the axial direction A of the motor, the elastic element 3 can be a hollow, closed annular structure, in which the hollow part can form a cooling oil passage L for cooling oil to pass through.

[0048] Optionally, an elastic element 3 can be provided between the bottom of the winding mounting groove 11 and the wire 2, thereby forming a cooling oil passage L between the bottom of the winding mounting groove 11 and the wire 2. In this way, the cooling oil passage L allows the cooling oil to contact the surface of the wire 2 more directly and fully, enhancing the efficiency of heat exchange and thus effectively improving the cooling effect on the wire 2.

[0049] like Figures 3 to 5 As shown, the elastic element 3 may include two pressure-receiving portions 31 and two compression-deformation portions 32. The pressure-receiving portions 31 may be flat, and the compression-deformation portions 32 may be U-shaped. The pressure-receiving portions 31 and the compression-deformation portions 32 are connected. The two pressure-receiving portions 31 are arranged opposite each other and parallel to each other along the radial direction R of the motor, and the two compression-deformation portions 32 are arranged opposite each other. The two arms of the U-shape of the compression-deformation portion 32 are respectively connected to the two pressure-receiving portions 31, and the two compression-deformation portions 32 are respectively connected to the two ends of the two pressure-receiving portions 31.

[0050] The two pressure-bearing parts 31 can contact the conductor 2, and the two extrusion deformation parts 32 can be located on the side of the winding mounting groove 11 (i.e., the two sides of the circumferential C). The two pressure-bearing parts 31 are pressed together by the conductor 2, and the two U-shaped arms of the extrusion deformation parts 32 are pressed together.

[0051] Optionally, in this embodiment, an elastic element 3 may be provided between every two conductors 2.

[0052] like Figure 4 As shown, in the natural state where the elastic member 3 is not compressed, the distance between the two compressed parts 31 is greater than the distance between the two arms of the U-shape of the compressed deformation part 32.

[0053] like Figure 5As shown, after the elastic member 3 is compressed and deformed, the distance between the two arms of the U-shape of the compressed deformation portion 32 decreases. For example, in its natural state without compression, the distance between the two arms of the U-shape of the compressed deformation portion 32 can be 0.2 to 0.5 mm; after the elastic member 3 is compressed and deformed, the distance between the two arms of the U-shape of the compressed deformation portion 32 can be 0.02 to 0.2 mm. It is understood that the minimum distance between the two arms of the U-shape of the compressed deformation portion 32 before the elastic member 3 is compressed and deformed, and the maximum distance between the two arms of the U-shape of the compressed deformation portion 32 after the elastic member 3 is compressed and deformed, are not selected simultaneously. The space between the two compressed portions 31 can form a cooling oil passage L for the passage of cooling oil. Similarly, cooling oil can also pass between the two arms of the U-shape of the compressed deformation portion 32.

[0054] like Figure 2 As shown, a cooling oil channel may be formed between the extrusion deformation section 32 and the wire 2, and / or a cooling oil channel may be formed between the extrusion deformation section 32 and the inner wall of the winding mounting groove 11.

[0055] In the circumferential direction C of the motor, the width of the elastic element 3 is less than or equal to the width of the wire 2. In the circumferential direction C of the motor, the elastic element 3 does not extend beyond the wire 2, and the elastic element 3 does not extend between the wire 2 and the side wall of the winding mounting slot 11. In this way, in the winding mounting slot 11 of the same width, the width of the wire 2 can be wider, which is beneficial to improving the torque and power of the motor.

[0056] The elastic element 3 can be made of an elastic material, such as a non-metallic polymer material (polymer material) or a carbon fiber material. The elastic element 3 can be manufactured by an extrusion molding process.

[0057] It is understandable that the elastic element 3 of this application has good elasticity and durability, can maintain the elastic modulus without decay, the deformation is easy to control, and the service life is long.

[0058] like Figure 2 and Figure 8 As shown, the winding fixing member 4 can be installed at the opening of the winding mounting groove 11. The winding fixing member 4 can press the wire 2 and the elastic member 3 in the winding mounting groove 11 radially outward, thereby fixing the wire 2 and the elastic member 3 in the winding mounting groove 11 and compressing and deforming the elastic member 3. Optionally, at the opening of the winding mounting groove 11, the side wall of the winding mounting groove 11 can be provided with a groove for installing the winding fixing member 4. The winding fixing member 4 can be embedded in the groove and fixedly installed on the stator core 1.

[0059] Optionally, an elastic element 3 can be provided between the winding fixing member 4 and the wire 2, thereby forming a cooling oil channel L between the winding fixing member 4 and the wire 2, which has a better cooling effect on the wire 2.

[0060] It is understandable that, on the radial R of the motor, the elastic element 3 in the winding mounting slot 11 occupies a small space in the winding mounting slot, thus providing a larger space to accommodate the wire 2. This allows the motor's performance to be improved and its service life to be extended under the premise of the same volume and heat dissipation performance.

[0061] Reference Figures 6 to 8 The following describes the process of installing the windings onto the stator core.

[0062] S1. Press the insulating paper 5 and the elastic element 3 into the winding mounting groove 11.

[0063] S2. Press the wire 2 into the winding mounting groove 11 so that the insulating paper 5 wraps the wire 2.

[0064] S3. Press the conductor 2 and the elastic element 3 along the radial direction R, so that the elastic element 3 is compressed and deformed. Insert the winding fixing element 4 into the winding mounting groove 11, so that the elastic element 3 is kept in a compressed and deformed state. The conductor 2 and the elastic element 3 are fixedly installed in the winding mounting groove 11.

[0065] This application is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of this application under the guidance of this application, without departing from the scope of this application. In addition, the following description is provided.

[0066] (1) In the above embodiment, the elastic element 3 is in contact with the bottom of the winding mounting groove 11, and the elastic element 3 is in contact with the winding fixing element 4 at the opening of the winding mounting groove 11. However, this application is not limited to this. In other possible embodiments, the wire can be in contact with the bottom of the winding mounting groove, and the wire can also be in contact with the winding fixing element.

[0067] (2) In the above embodiment, the elastic element 3 is a completely closed ring. However, this application is not limited to this; for example, the elastic element 3 may also be a substantially or approximately closed ring. For example, one of the pressure-bearing portions 31 of the elastic element 3 is located in the width direction of the elastic element 3 ( Figure 4 , 5 The elastic member 3 is split at its midpoint (in the left-right direction) to form two ends. These two ends can be close together or overlap at their midpoints in the width direction, thereby forming a cooling channel within the elastic member 3. Alternatively, the two ends of the elastic member 3 can be bent towards another pressure-bearing portion at their midpoints, thus roughly dividing the interior of the elastic member 3 into two cooling oil channels. Compared to forming multiple cooling oil channels within the elastic member, a single cooling oil channel with one or two channels has a larger cross-sectional area, lower flow resistance, smoother cooling oil flow, and higher heat dissipation efficiency. It should be understood that at least some aspects or features of the above embodiments, examples, or examples can be appropriately combined.

[0068] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0069] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0070] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0071] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. An electric machine stator, characterized in that, include: Stator core, wherein the stator core is provided with winding mounting slots; A winding, which is partially housed in a winding mounting slot, the winding comprising a plurality of conductors having a plurality of conductors arranged radially along the motor stator in the winding mounting slot; as well as An elastic element is disposed in the winding mounting slot. When viewed along the axial direction of the motor stator, the elastic element is disposed between at least two adjacent conductors, and one or more cooling oil channels are formed inside the elastic element.

2. The motor stator of claim 1, wherein The elastic element is a hollow, closed annular structure, and the hollow part of the elastic element forms the cooling oil channel. One or two cooling oil channels are formed inside the elastic element.

3. The motor stator of claim 1, wherein, The elastic element includes two pressure-receiving parts and two extrusion deformation parts. The pressure-receiving parts are flat, and the extrusion deformation parts are U-shaped. The pressure-receiving parts and the extrusion deformation parts are connected. The two pressure-receiving parts are arranged opposite each other along the radial direction of the motor stator. The two extrusion deformation parts are arranged opposite each other. The two pressure-receiving parts are in contact with the wires. The two extrusion deformation parts are respectively connected to the two ends of the two pressure-receiving parts.

4. The motor stator of claim 3, wherein, In the natural state where the elastic element is not compressed, the distance between the two compressed portions is greater than the distance between the two arms of the U-shape of the compressed deformation portion.

5. The motor stator of claim 3, wherein, A cooling oil channel is formed between the extruded deformation portion and the conductor, and / or a cooling oil channel is formed between the extruded deformation portion and the inner wall of the winding mounting groove.

6. The motor stator of claim 1, wherein, The elastic element is provided between the bottom of the winding mounting slot and the wire, thereby forming the cooling oil passage between the bottom of the winding mounting slot and the wire; and / or The motor stator also includes a winding fixing member, which is installed at the opening of the winding mounting slot. The winding fixing member can squeeze the wire and the elastic member in the winding mounting slot, thereby fixing the wire and the elastic member in the winding mounting slot. The elastic member is provided between the winding fixing member and the wire, thereby forming the cooling oil passage between the winding fixing member and the wire.

7. The motor stator of claim 1, wherein One of the elastic elements is provided between every two of the wires.

8. The motor stator of claim 1, wherein, The elastic element is made of non-metallic polymer material or carbon fiber, and the elastic element is manufactured by an extrusion molding process; and / or The cross-section of the conductor is rectangular.

9. The motor stator of claim 1, wherein, In the circumferential direction of the motor stator, the width of the elastic element is less than or equal to the width of the conductor.

10. An electric machine characterized by The motor stator includes any one of claims 1 to 9.

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