Stator assembly, motor and positioning tool

Abstract

The embodiment of the application provides a kind of stator assembly, motor and positioning tool, stator assembly, comprising: iron core;Winding, winding is arranged in the tooth slot of iron core;Connecting assembly, connecting assembly is sleeved in the joint of winding, connecting assembly has initial state before heating, and connecting assembly has expansion state after being heated and expanded;Wherein, when connecting assembly is in expansion state, connecting assembly and the joint of winding are detachably connected, and when connecting assembly is in initial state, connecting assembly and joint are fixedly connected.Connecting assembly only needs small height to realize reliable connection, does not need additional welding space, can significantly reduce the size of winding end portion under the premise of not sacrificing connection strength, improve the overall compactness and efficiency of motor, solve the problem that winding welding in prior art causes significant increase of motor winding end portion size.

Description

Technical Field

[0001] This application relates to the field of motor manufacturing technology, and more specifically, to a stator assembly, a motor, and a positioning fixture. Background Technology

[0002] In existing technologies, flat-wire motors occupy an important position in the power systems of new energy vehicles due to their high power density, high efficiency, and compact structure. However, in the motor manufacturing process, especially in the winding connection stage, traditional welding methods (such as TIG or laser welding) have significant technical limitations.

[0003] While current welding techniques widely used in the industry can effectively connect winding wires, in practice, to ensure welding quality, traditional welding processes often require leaving sufficient space at the wire connection points. This directly leads to a significant increase in the size of the motor winding ends, thus affecting the overall size and weight of the motor. In the modern automotive industry, which pursues lightweighting and miniaturization, this has become a critical issue that urgently needs to be addressed.

[0004] There is currently no effective solution to the aforementioned technical problems. Summary of the Invention

[0005] This application provides a stator assembly, a motor, and a positioning fixture, which aims to improve the problem of a significant increase in the size of the motor winding ends caused by winding welding in the prior art.

[0006] According to one aspect of the embodiments of this application, a stator assembly is provided, including: an iron core; a winding wound in the toothed grooves of the iron core; and a connecting assembly sleeved on a joint of the winding, the connecting assembly having an initial state before heating and an expanded state after being heated; wherein, when the connecting assembly is in the expanded state, the connecting assembly is detachably connected to the joint of the winding, and when the connecting assembly is in the initial state, the connecting assembly is fixedly connected to the joint of the winding.

[0007] The above-mentioned optional embodiments of this application achieve the following technical effects: by positioning the connecting component with the winding joint in the expanded state after heating and expansion, and then returning to the initial state after cooling, the connecting component and the winding joint are fixedly connected. The connecting component only needs a small height to achieve a reliable connection, without the need for additional welding space. Without sacrificing the connection strength, the size of the winding end can be significantly reduced, improving the overall compactness and efficiency of the motor. This solves the problem of significant increase in the size of the motor winding end caused by winding welding in the prior art.

[0008] Furthermore, the connection assembly includes multiple connectors, the winding includes multiple flat wire conductors, the multiple connectors are arranged corresponding to the joints of the multiple flat wire conductors, and each connector has an initial state and an expanded state.

[0009] The above-mentioned optional embodiments of this application achieve the following technical effects: The configuration of multiple connectors enables parallel operation of the connection process, that is, multiple joints of the motor winding are connected in pairs at the same time, which greatly improves production efficiency. Each connector is positioned on the joint of the winding after heating and expansion, and is fixed on the joint of the winding after cooling, without the need for additional fixing structures, simplifying the assembly process after connection. When the connector is in the expanded state, the connector is detachably connected to the joint of the winding. At this time, the joint of the winding can be extended into the mounting hole, and when the connector is in the initial state, the connector is fixedly connected to the joint.

[0010] Furthermore, the connectors are made of metal.

[0011] The above-mentioned optional embodiments of this application achieve the following technical effects: a specific metal material (such as copper) has a moderate coefficient of thermal expansion, which enables it to expand to fit tightly with the joint of the winding when heated, and shrink back to its original size after cooling, forming a stable connection.

[0012] Furthermore, the connector has mounting holes, which are square holes.

[0013] The above optional embodiments of this application achieve the following technical effects: compared with circular holes, square holes can provide better axial positioning and guiding capabilities, and can effectively prevent the connector from rotating during heating expansion and cooling contraction.

[0014] Furthermore, the connector has a ring-shaped structure.

[0015] The optional embodiments described above achieve the following technical effects: When the annular connector is fitted into the winding joint, it can evenly distribute pressure across the entire joint, avoiding material damage or unstable connection caused by uneven local stress. When heated, the annular connector expands in all directions, forming a tight fit with the winding joint. After cooling, the connector shrinks in all directions, thus forming a tight and uniform clamp at the end of the winding coil. This clamping effect is more reliable than that of non-annular connectors, ensuring close contact between the connector and the winding.

[0016] Furthermore, the width of the mounting hole is b, the height of the connector is h, and h / b≥0.75.

[0017] The above-mentioned optional embodiments of this application achieve the following technical effects: This arrangement can absorb, to a certain extent, the circumferential misalignment after the joint of the flat wire conductor is twisted, reducing the need for precise production positioning. Increasing the height h provides a larger contact area, which is beneficial for more uniform current distribution, reducing localized overheating, and improving the electrical efficiency and stability of the connection.

[0018] Furthermore, the length of the mounting hole is a, the width of the mounting hole is b, the width of the flat conductor joint is c, and the thickness of the flat conductor joint is d, where b = 2d and a > c.

[0019] The above-mentioned optional embodiments of this application achieve the following technical effects: After the connector is sleeved on the flat conductor, the length direction of the mounting hole is parallel to the width direction of the flat conductor, and the width direction of the mounting hole is parallel to the thickness direction of the flat conductor. Setting b=2d makes the connector and the wide surface of the flat conductor fit tightly, increasing the contact area and making the two flat conductors tightly connected; setting a>c makes a certain gap reserved between the connector and the flat conductor in the torsional direction of the flat conductor to absorb the misalignment after the two flat conductors are torn.

[0020] According to another aspect of the embodiments of this application, an electric motor is provided, the electric motor including a rotor assembly and the stator assembly described above.

[0021] The embodiments of this application achieve the following technical effects: By adopting an innovative flat wire motor winding connection fixture, the motor not only solves the technical problems existing in traditional welding connections, but also brings multiple advantages such as optimized end dimensions, reduced production costs and improved efficiency.

[0022] According to another aspect of the embodiments of this application, a positioning fixture is provided for positioning the stator assembly described above. The fixture includes a positioning member, which is annular and has a plurality of positioning holes spaced apart on it. The positioning holes are used to accommodate a connecting component. When the connecting component is in an expanded state, it is fixedly connected to the positioning hole. When the connecting component is in an initial state, it is detachably connected to the positioning hole.

[0023] The embodiments of this application achieve the following technical effects: Before connection begins, the connecting component is heated and expanded by a heating device. The connecting component is precisely positioned through the positioning holes of the positioning member and fixedly connected to the positioning member, ensuring that its position is aligned with the connector of the winding to be connected. This allows the connecting component to be smoothly fitted onto the connector of the winding, achieving initial positioning. Subsequently, the connecting component contracts under natural or forced cooling, generating sufficient clamping force to make the connecting component detachable from the positioning member and in close contact with the connector of the winding, forming a stable electrical connection. The synergistic effect of the positioning component and the connecting component ensures the alignment and fixation between the connector of the winding and the connecting component during the connection process, thereby improving the connection quality and production efficiency.

[0024] Furthermore, the positioning element is made of polyamide, polyetheretherketone, polytetrafluoroethylene, or graphite epoxy resin.

[0025] The above-mentioned optional embodiments of this application achieve the following technical effects: the positioning component made of polyamide, polyetheretherketone, polytetrafluoroethylene or graphite epoxy resin can not only ensure the accurate alignment of the connection components during operation, but also provide durable and stable positioning support, further improving the consistency and production efficiency of the flat wire motor winding connection process. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of a stator assembly provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of a connector provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of a stator assembly provided in an embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the positioning fixture provided in one embodiment of this application;

[0031] Explanation of reference numerals in the attached figures:

[0032] 10. Positioning components;

[0033] 11. Positioning holes;

[0034] 20. Connecting components;

[0035] 21. Connectors;

[0036] 211. Mounting holes;

[0037] 30. Stator core;

[0038] 40. Winding; 41. Flat wire conductor. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] 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.

[0041] It should be noted that the terms "first," "second," etc., 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 terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0043] In existing technologies, TIG (tungsten inert gas) or laser welding techniques are commonly used to connect flat-wire motor windings. This method involves localized heating to melt the metal at the winding ends, thereby welding two or more conductors together to achieve an electrical connection. However, the welding process has significant drawbacks: First, the high temperatures generated during welding can damage or even carbonize the insulating varnish film on the surface of the enameled wire, reducing the motor's insulation performance and potentially causing product quality issues. Second, to avoid an excessively large heat-affected zone, a large space is usually reserved near the welding point, increasing the winding end dimensions and affecting the motor's compact design. Furthermore, metal spatter in the molten pool during welding is difficult to completely avoid, directly impacting product yield and increasing post-processing costs. In summary, while existing technologies can meet the basic requirements for electrical connections, they have limitations in improving product reliability and reducing costs.

[0044] Combination Figures 1 to 3 As shown, according to a specific embodiment of this application, a stator assembly is provided, including a stator core 30, a winding 40, and a connecting assembly 20. The winding 40 is wound within the tooth grooves of the stator core 30. The connecting assembly 20 is sleeved on the joint of the winding 40. The connecting assembly 20 has an initial state before heating and an expanded state after being heated. When the connecting assembly 20 is in the expanded state, the connecting assembly 20 is detachably connected to the joint of the winding 40. When the connecting assembly 20 is in the initial state, the connecting assembly 20 is fixedly connected to the joint.

[0045] Compared to existing technologies, this application uses a connecting component 20 with thermal expansion properties to fix the winding 40. The connecting component 20, after being heated and expanded to its expanded state, is fitted onto the joint of the winding 40. When the connecting component 20 cools and returns to its initial state, it can be fixedly connected to the joint of the winding 40. The connecting component 20 only needs a small height to achieve a reliable connection, without the need to reserve a large space at the joint of the winding 40. Without sacrificing the connection strength, the size of the winding end can be significantly reduced, improving the overall compactness and efficiency of the motor. This solves the problem of the significant increase in the size of the motor winding end caused by winding welding in existing technologies, and also effectively avoids problems such as poor electrical contact and uneven resistance that may occur in traditional welding processes, thereby improving the electrical performance of the motor.

[0046] It should be noted that a detachable connection refers to two or more components that can be relatively easily separated and recombined without damaging the connection structure itself, while a fixed connection refers to two components that, once connected, are difficult or almost impossible to separate without damaging the connection structure or components. The connection component 20 in this embodiment avoids damage to the enameled wire insulation layer caused by high temperatures. At the same time, this connection method avoids damage to the enamel film caused by metal spatter during welding, thereby improving the product's pass rate and consistency, and providing a more efficient and reliable connection solution for the manufacture of flat wire motors.

[0047] Furthermore, the connection assembly 20 includes a plurality of connectors 21, the winding 40 includes a plurality of flat wire conductors 41, the plurality of connectors 21 are provided corresponding to the joints of the plurality of flat wire conductors 41, and each connector 21 has an initial state and an expanded state.

[0048] Combination Figure 1As shown, the winding 40 includes multiple flat wire conductors 41, which are interconnected and wound around the slots of the stator core 30 to form the winding 40. Each connector 21 is fitted onto the joint of two flat wire conductors 41 to reliably connect the two flat wire conductors 41. The configuration of multiple connectors 21 allows for parallel operation of the connection process, that is, connecting multiple joints of the motor winding at the same time, which greatly improves production efficiency. When the connector 21 is in the expanded state, the connector 21 is detachably connected to the joint of the flat wire conductor 41. At this time, the joint of the two flat wire conductors 41 can be extended into the mounting hole 211 for positioning. When the connector 21 is in the initial state, the connector 21 is fixedly connected to the joint of the two flat wire conductors 41, replacing the winding welding in the prior art.

[0049] Furthermore, the connector 21 is made of metal.

[0050] In this embodiment, a specific metallic material (such as copper) has a suitable coefficient of thermal expansion, allowing it to expand to fit tightly against the winding joint when heated, and then shrink back to its original size after cooling, forming a stable connection. This characteristic is key to achieving a weld-free connection with the connector 21. Specifically, the connector 21 can be made of, but is not limited to, copper, copper alloys, aluminum, aluminum alloys, nickel, or nickel alloys, as long as it is a metal with an appropriate coefficient of thermal expansion, sufficient mechanical strength, and high-temperature resistance.

[0051] Furthermore, the connector 21 has a mounting hole 211, which is a square hole.

[0052] In this embodiment, the square hole provides better axial positioning and guiding capabilities compared to the circular hole. The main purpose of using a square hole is that it connects to the flat wire conductor 41. Since the cross-section of the flat wire conductor 41 is rectangular, using a square hole increases the contact area between the connector 21 and the flat wire conductor 41, ensuring the reliability of the connection. Furthermore, the connector 21 has a ring-shaped structure.

[0053] Combination Figure 2As shown, when the annular connector is fitted onto the joint of the flat conductor 41, it can evenly distribute pressure across the entire joint, avoiding material damage or unstable connection caused by uneven local stress. The annular connector 21 expands in all directions during heating. After cooling, the connector 21 shrinks in all directions, forming a tight and uniform clamp on the joint of the flat conductor 41. This clamping effect is more reliable than that of a non-annular connector, ensuring tight contact between the connector and the winding, maintaining connection stability even during vibration and temperature changes during motor operation. The annular connector design reduces material waste; by precisely controlling its size and shape, it maximizes material utilization during heating expansion and cooling contraction, reducing production costs.

[0054] Furthermore, the width of the mounting hole 211 is b, the height of the connector 21 is h, and h / b≥0.75.

[0055] Combination Figure 2 and Figure 3 As shown, the length of the mounting hole 211 is *a*, the width of the mounting hole 211 is *b*, the height of the connector 21 is *h*, the width of the joint of each flat conductor 41 is *c*, and the thickness of the joint of each flat conductor 41 is *d*. The height *h* of the connector 21 needs to be obtained through comprehensive testing, considering factors such as current-carrying area and pull-out force. Its value is *h / d ≥ 1.5*, i.e., *h / b ≥ 0.75*. Increasing the height *h* provides a larger contact area, which is beneficial for more uniform current distribution, reduces localized overheating, and improves the electrical efficiency and stability of the connection.

[0056] Furthermore, the length of the mounting hole 211 is a, the width of the mounting hole 211 is b, the width of the joint of the flat wire conductor 41 is c, and the thickness of the joint of the flat wire conductor 41 is d, where b = 2d and a > c.

[0057] Combination Figure 2 and Figure 3 As shown, the length of the mounting hole 211 is a, the width of the mounting hole 211 is b, the height of the connector 21 is h, the joint of the flat wire conductor 41 is a flat wire, the width of the joint of each flat wire conductor 41 is c, and the thickness of the joint of each flat wire conductor 41 is d. After the connector 21 is fitted onto the flat wire conductor 41, the length direction of the mounting hole 211 is parallel to the width direction of the flat wire conductor 41, and the width direction of the mounting hole 211 is parallel to the thickness direction of the flat wire conductor 41. Setting b = 2d ensures that the connector 21 and the wide surface of the flat wire conductor 41 fit tightly together, increasing the contact area and ensuring a tight connection between the two flat wire conductors 41. Setting a > c allows a certain gap to be reserved between the connector 21 and the flat wire conductor 41 in the torsional direction of the flat wire conductor 41 to absorb misalignment after the two flat wire conductors 41 are torn. Preferably, a is slightly greater than c.

[0058] This application also provides an electric motor, which includes a rotor assembly and a stator assembly as described in the above embodiments.

[0059] The motor proposed in this embodiment, by using the connecting component 20, eliminates the reliance on traditional welding processes for connecting the ends of the winding 40. This avoids problems such as paint film damage and metal spatter that may occur during welding, significantly improving connection reliability and product yield. Since the connecting component 20 requires less physical space than the weld point, the size of the motor winding ends can be effectively reduced, lowering the overall axial dimension of the motor. This contributes to the miniaturization and lightweight design of the motor, while also improving installation compatibility. Compared to welding, the use of metal ring connectors reduces heat consumption and equipment investment, simplifies the production process, and reduces the need for subsequent processing (such as slag removal), thereby lowering the motor's production cost. By adopting an innovative flat wire motor winding connecting component, not only are the technical challenges of traditional welding connections solved, but multiple advantages such as optimized end dimensions, reduced production costs, and improved efficiency are also brought about.

[0060] According to another aspect of the embodiments of this application, a positioning fixture is provided for positioning the stator assembly described above. The positioning fixture includes a positioning member 10, which is annular. A plurality of positioning holes 11 are provided on the positioning member 10 at intervals. Each positioning hole 11 is opposite to two flat wire conductors 41 to be connected. The positioning holes 11 are used to accommodate a connecting component 20. When the connecting component 20 is in an expanded state, it is fixedly connected to the positioning hole 11. When the connecting component 20 is in an initial state, it is detachably connected to the positioning hole 11.

[0061] Combination Figure 4 As shown, in this embodiment, the positioning member 10 is provided with multiple positioning holes 11, which are evenly distributed along the circumference of the stator core 30. The purpose of these holes is to accurately position and fix the connecting assembly 20, ensuring precise alignment between the connector of the flat wire conductor 41 and the connecting assembly 20. Each positioning hole 11 is designed to match the shape of the connecting assembly 20 to ensure stable positioning of the connecting assembly during heating and cooling. When the positioning member 10 is in operation, at least a portion of the connectors of the flat wire conductor 41 to be connected on the stator core 30 and the corresponding connecting assembly 20 extend into the positioning hole 11. This design ensures that the connecting assembly 20 can accurately fit into the winding connector during the connection process, avoiding positional shifts and improving connection accuracy and efficiency.

[0062] The positioning and connection process in this embodiment is as follows: When the connecting component 20 is heated to a predetermined temperature, it expands due to the thermal expansion coefficient of the material. At this time, the expanded connecting component 20 tightly fits the positioning hole 11. Utilizing the guiding effect of the positioning hole 11, the connecting component 20 is precisely aligned with the connector of the flat wire conductor 41 under heating conditions, achieving high-precision positioning. Since the tight fit between the connecting component 20 and the positioning hole 11 is achieved through the principle of thermal expansion, the connecting component 20 can be easily removed from the positioning hole 11 after cooling. The fixed connection between the connecting component 20 and the connector of the flat wire conductor 41 is achieved in the reduced state after cooling, ensuring connection stability. This characteristic also significantly improves the reusability of the positioning hole 11, reduces production costs, and simplifies the operation process. The thermal expansion-cooling contraction characteristic of the connecting component 20 is achieved by selecting a material with an appropriate thermal expansion coefficient, such as copper or copper alloys. These materials expand rapidly when heated and return to their original shape when cooled, ensuring reliability during the connection process and stability after connection.

[0063] When the connector 21 is connected to the positioning hole 11 of the positioning member 10, the square mounting hole ensures the correct vertical positioning of the connector 21, reducing loosening or misalignment caused by inaccurate positioning and improving the stability and reliability of the connection. The square hole effectively prevents the connector from rotating during heating expansion and cooling contraction, which is crucial for ensuring proper alignment between the connector 21 and the flat wire conductor 41. During the connection process between the connector 21 and the positioning member 10, the square hole provides a larger contact area, and the corners of the square hole form a more robust mechanical fit with the positioning hole 11. Even under external vibration or impact, the connector 21 remains stable, enhancing the overall mechanical strength of the connection.

[0064] Combination Figure 1 As shown, multiple positioning holes 11 are evenly arranged around the circumference of the positioning member 10. This layout effectively utilizes the spatial distribution characteristics of the motor winding 40, ensuring that the joint of each flat wire conductor 41 is accurately positioned and supported during connection. The number of positioning holes 11 matches the layout of the motor winding. For example, in an 8-pole, 48-slot stator design, 48 positioning holes 11 may be required so that each flat wire conductor 41 joint has a corresponding positioning point, achieving a comprehensive and meticulous connection.

[0065] The detachable connection mechanism between the connector 21 and the positioning member 10 allows the connector 21 to be easily installed on the positioning hole 11 of the positioning member before the connection process begins, after the connector 21 has been heated to an expanded state (e.g., ...). Figure 4 As shown), when it cools and shrinks, it can tightly fit the joint of the flat wire conductor 41 and separate from the positioning member 10 (as shown). Figure 1 As shown in the diagram, this facilitates subsequent connection operations or tooling maintenance and replacement. This connection method not only improves connection efficiency but also ensures the precise positioning of connector 21 in each operation cycle, avoiding connection problems caused by inaccurate positioning.

[0066] Furthermore, the positioning element 10 is made of polyamide, polyetheretherketone, polytetrafluoroethylene or graphite epoxy resin.

[0067] In this embodiment, the positioning element 10 can be made of, but is not limited to, high-performance engineering plastics or composite materials (materials with low coefficients of thermal expansion) such as polyamide, polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), or graphite epoxy resin, to ensure good high-temperature resistance and electrical insulation properties. This allows the structure to remain stable during the heating and expansion of the connecting assembly 20, preventing deformation or damage due to high temperatures. This ensures the accuracy of the positioning hole 11 and the reliability of the positioning element 10 throughout the connection process, and also effectively protects the motor windings from unexpected currents. In this application, "multiple" refers to two or more.

[0068] Furthermore, multiple connectors 21 are provided in a one-to-one correspondence with multiple positioning holes 11.

[0069] Combination Figure 4 As shown, the configuration of multiple connectors 21 enables parallel operation of the connection process, allowing multiple joints of the motor windings to be connected simultaneously, greatly improving production efficiency. Each connector 21, after heating and expansion, can independently adhere to the positioning member 10, forming a tight connection, and is positioned on the joint of the flat wire conductor 41 by the positioning member 10. After cooling, each connector 21 is fixed to the joint of the flat wire conductor 41, eliminating the need for additional fixing structures and simplifying the assembly process after connection. Furthermore, the one-to-one correspondence between the multiple connectors 21 and the positioning holes 11 ensures uniform stress on each winding joint during connection, avoiding connection quality problems caused by uneven local stress, further improving connection stability and the overall performance of the motor.

[0070] In this application, unless otherwise expressly defined, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0071] The terms “first,” “second,” “third,” “fourth,” etc., in this application (if present) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0072] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0073] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, if the method includes steps A and B, it means that the method may include steps A and B performed sequentially, or it may include steps B and A performed sequentially. For example, if the method may also include step C, it means that step C may be added to the method in any order. For example, the method may include steps A, B, and C, or it may include steps A, C, and B, or it may include steps C, A, and B, etc.

Claims

1. A stator assembly, characterized in that, include: Stator core (30); Winding (40), the winding (40) is wound in the slots of the stator core (30); A connecting component (20) is sleeved on the connector of the winding (40), the connecting component (20) has an initial state before heating, and the connecting component (20) has an expanded state after being heated; When the connecting component (20) is in the expanded state, the connecting component (20) is detachably connected to the connector of the flat wire conductor (41). When the connecting component (20) is in the initial state, the connecting component (20) is fixedly connected to the connector of the flat wire conductor (41).

2. The stator assembly according to claim 1, characterized in that, The connection assembly (20) includes a plurality of connectors (21), the winding (40) includes a plurality of flat wire conductors (41), the plurality of connectors (21) are provided corresponding to the joints of the plurality of flat wire conductors (41), and each connector (21) has the initial state and the expanded state.

3. The stator assembly according to claim 2, characterized in that, The connector (21) is made of metal.

4. The stator assembly according to claim 2, characterized in that, The connector (21) has a mounting hole (211), which is a square hole.

5. The stator assembly according to claim 2, characterized in that, The connector (21) has a ring structure.

6. The stator assembly according to claim 4, characterized in that, The width of the mounting hole (211) is b, and the height of the connector (21) is h, where h / b≥0.

75.

7. The stator assembly according to claim 4, characterized in that, The length of the mounting hole (211) is a, the width of the mounting hole (211) is b, the width of the joint of the flat wire conductor (41) is c, and the thickness of the joint of the flat wire conductor (41) is d, where b=2d and a>c.

8. An electric motor, characterized in that, The motor includes a rotor assembly and a stator assembly according to any one of claims 1 to 7.

9. A positioning fixture, said positioning fixture for positioning a stator assembly according to any one of claims 1 to 7, characterized in that, include: The positioning component (10) is annular and has a plurality of positioning holes (11) spaced apart. The positioning holes (11) are used to accommodate the connecting component (20). When the connecting component (20) is in the expanded state, it is fixedly connected to the positioning holes (11). When the connecting component (20) is in the initial state, it is detachably connected to the positioning holes (11).

10. The positioning fixture according to claim 9, characterized in that, The positioning element (10) is made of polyamide, polyether ether ketone, polytetrafluoroethylene or graphite epoxy resin.

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