Coil windings, stator assembly, axial flux motors and vehicles

Abstract

This disclosure relates to a coil winding, a stator assembly, an axial flux motor, and a vehicle. The coil winding includes a first coil and a second coil, both of which are connected to a stator core. A gap exists between the first coil and the stator core, and a portion of the second coil extends into the gap, such that the first coil and the second coil are partially stacked in the radial direction and / or axial direction of the stator core. By extending a portion of the second coil into the gap between the first coil and the stator core, this coil winding utilizes this space, avoiding wasted space and significantly improving space utilization.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, specifically to a coil winding, stator assembly, axial flux motor, and vehicle. Background Technology

[0002] In motors of related technologies, the coil winding is a single, independent coil structure. When the coil is wound on the stator core, there is a gap between the coil and the stator core, which wastes a lot of space and results in low space utilization of the motor. Summary of the Invention

[0003] The purpose of this disclosure is to provide a coil winding, stator assembly, axial flux motor, and vehicle to solve the problems in the aforementioned related technologies.

[0004] To achieve the above objectives, one aspect of this disclosure provides a coil winding including a first coil and a second coil, both of which are connected to a stator core. A gap exists between the first coil and the stator core, and a portion of the second coil extends into the gap, such that the first coil and the second coil are partially stacked in the radial direction and / or the axial direction of the stator core.

[0005] Optionally, the first coil and / or the second coil includes an outer coil body and an inner coil body, wherein the inner coil body is nested within the outer coil body.

[0006] Optionally, both the first coil and the second coil are configured to be parallel to the radial plane of the stator core, and the second coil is provided with a clearance portion that can avoid the first coil, allowing a portion of the first coil to pass through the clearance portion;

[0007] In the axial direction of the stator core, a portion of the first coil is positioned above a portion of the second coil;

[0008] In the radial direction of the stator core, the first coil and the second coil are partially stacked.

[0009] Optionally, the clearance portion is configured as a receiving groove formed by a portion of the second coil recessed along the axial direction of the stator core, the receiving groove being capable of accommodating a portion of the first coil.

[0010] Optionally, the second coil includes a second outer coil body, a second inner coil body, a second bridging section, and two second electrode connectors. The second inner coil body is at least partially located within the second outer coil body. The first end of the second bridging section is connected to the second inner coil body, and the second end of the second bridging section is connected to the second outer coil body. The two second electrode connectors are respectively connected to the second inner coil body and the second outer coil body.

[0011] Optionally, the second inner ring body is stacked on the side of the second outer ring body near the axis of the stator core in the axial direction of the stator core, and is recessed along the axial direction of the stator core to form a first groove.

[0012] The second inner ring body is stacked on the side of the second outer ring body away from the axis of the stator core in the axial direction of the stator core, and is recessed along the axial direction of the stator core to form a second groove. The first groove and the second groove together constitute the clearance portion.

[0013] Optionally, the first end of the second bridging section is connected to the side of the second inner ring body away from the axis of the stator core, and the second end of the second bridging section is connected to the side of the second outer ring body away from the axis of the stator core; the second bridging section is inclined along the axial direction of the stator core; or,

[0014] The first end of the second bridging section is connected to the side of the second inner ring body near the axis of the stator core, and the second end of the second bridging section is connected to the side of the second outer ring body near the axis of the stator core. The second bridging section is inclined along the axial direction of the stator core.

[0015] Optionally, the first coil includes a first outer coil body, a first inner coil body, a first bridging section, and two first electrode connectors. The first outer coil body is sleeved on the first inner coil body. The first end of the first bridging section is connected to the first inner coil body, and the second end of the first bridging section is connected to the first outer coil body. The two first electrode connectors are respectively connected to the first inner coil body and the first outer coil body.

[0016] Optionally, the first end of the first bridging section is connected to the side of the first inner ring body away from the axis of the stator core, and the second end of the first bridging section is connected to the side of the first outer ring body away from the axis of the stator core; the first bridging section is inclined along the radial direction of the stator core; or,

[0017] The first end of the first bridging section is connected to the side of the first inner ring body near the axis of the stator core, and the second end of the first bridging section is connected to the side of the first outer ring body near the axis of the stator core. The first bridging section is inclined along the radial direction of the stator core.

[0018] Optionally, the straight-line distance between the end of the second coil away from the axis of the stator core and the axis of the stator core is less than the straight-line distance between the end of the first coil away from the axis of the stator core and the axis of the stator core.

[0019] Optionally, the first coil and the second coil are made of flat copper wire.

[0020] A second aspect of this disclosure also provides a stator assembly, including a stator core and a plurality of the above-described coil windings, wherein the stator core is provided with a plurality of mounting slots, and the first coil and the second coil of each of the coil windings are respectively connected to the mounting slots;

[0021] In this configuration, a plurality of first coils are arranged in a ring at intervals around the axis of the stator core. Each first coil has a gap between itself and the inner and outer ring walls of the stator core. A second coil is provided between each two adjacent first coils, and portions of the second coils are located within the gaps between the two adjacent first coils and the stator core.

[0022] Optionally, the first and second coils of every two coil windings are connected in parallel or in series so that every two coil windings constitute a phase.

[0023] A third aspect of this disclosure also provides an axial flux motor, including the stator assembly described above.

[0024] A fourth aspect of this disclosure also provides a vehicle including the stator assembly described above, or the axial flux motor described above.

[0025] The above technical solution configures the coil winding into two types of coils: a first coil and a second coil. By extending a portion of the second coil into the gap between the first coil and the stator core, this gap space also becomes a coil structure, utilizing this space, avoiding waste, and greatly improving space utilization. Simultaneously, configuring the coil winding into first and second coils allows for pre-manufacturing of the coil windings, enabling direct connection of the first and second coils to the stator core without the need for winding on the stator core. This simplifies the manufacturing process, facilitates production, and improves production efficiency.

[0026] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a three-dimensional structural schematic diagram of a coil winding according to one embodiment of the present disclosure;

[0029] Figure 2 This is a three-dimensional structural schematic diagram of the first coil according to one embodiment of the present disclosure;

[0030] Figure 3 This is a three-dimensional structural schematic diagram of the second coil according to one embodiment of the present disclosure;

[0031] Figure 4 This is a three-dimensional structural schematic diagram of a stator assembly according to one embodiment of the present disclosure;

[0032] Figure 5 This is a schematic structural diagram of a stator assembly according to one embodiment of the present disclosure.

[0033] Explanation of reference numerals in the attached figures

[0034] 1. First coil; 11. First inner coil body; 111. First inner section; 112. First outer section; 113. First straight section; 12. First outer coil body; 121. Second inner section; 122. Second outer section; 123. Second straight section; 13. First bridging section; 14. First electrode connector.

[0035] 2. Second coil; 21. Second inner ring body; 211. Third inner section; 212. Third outer section; 213. Third straight section; 22. Second outer ring body; 221. Fourth inner section; 222. Fourth outer section; 223. Fourth straight section; 23. Second bridging section; 24. Second electrode connector; 25. First groove; 26. Second groove.

[0036] 3. Avoidance section;

[0037] 4. Stator core; 41. Mounting slot;

[0038] 5. Gap. Detailed Implementation

[0039] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0040] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" are generally used to define the orientation of the accompanying drawings, and "inner" and "outer" refer to the inner and outer sides of the relevant components. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can be a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0042] In the related technology, the coil winding of the motor is a single independent coil structure. When the coil is wound on the stator core 4, because the coil is wound with copper wire, the copper wire has a certain hardness, resulting in a gap 5 between the coil and the stator core 4. This gap 5 is not effectively utilized, wasting a lot of space, resulting in low space utilization of the motor.

[0043] In addition, the motors of this technology are manufactured by winding copper wires on the stator core 4 to form the stator assembly, which is a relatively complex manufacturing process and has low production efficiency.

[0044] Therefore, such as Figures 1-3 As shown, one aspect of this disclosure provides a coil winding, including a first coil 1 and a second coil 2, both of which are connected to a stator core 4. A gap 5 is provided between the first coil 1 and the stator core 4, and a portion of the second coil 2 extends into the gap 5, such that the first coil 1 and the second coil 2 are partially stacked in the radial direction and / or axial direction of the stator core 4.

[0045] In this structure, a portion of the second coil 2 extends into the gap 5, thereby stacking the portion of the second coil 2 that extends into the gap 5 with the first coil 1. This allows for the utilization of the space in the gap 5, thus improving space utilization.

[0046] In the above technical solution, the coil winding is configured with two types of coils, namely a first coil 1 and a second coil 2. By extending a portion of the second coil 2 into the gap 5 between the first coil 1 and the stator core 4, this space in the gap 5 also has a coil structure, thus utilizing this space, avoiding waste, and greatly improving space utilization. Simultaneously, configuring the coil winding with a first coil 1 and a second coil 2 allows for pre-manufacturing of the coil winding. The first coil 1 and the second coil 2 can be directly connected to the stator core 4 without needing to wind them on the stator core 4, simplifying the manufacturing process, facilitating production, and improving production efficiency.

[0047] Optionally, in one embodiment of this disclosure, the first coil 1 and / or the second coil 2 include an outer coil body and an inner coil body, with the inner coil body nested within the outer coil body. This arrangement can further improve the space utilization of the first coil 1 and / or the second coil 2.

[0048] In related technologies, the coils in motors typically extend along the axial direction of the stator core 4, that is, parallel to the axis of the stator core 4. Therefore, in order to reduce the length occupied by the coil winding in the axial direction of the stator core 4, and to facilitate the stacking of the first coil 1 and the second coil 2, optionally, in one embodiment of this disclosure, both the first coil 1 and the second coil 2 are configured to be parallel to the radial plane of the stator core 4. The second coil 2 is provided with a clearance portion 3, which can avoid the first coil 1, so that a portion of the first coil 1 passes through the clearance portion 3. In the axial direction of the stator core 4, a portion of the first coil 1 is positioned above a portion of the second coil 2. In the radial direction of the stator core 4, the first coil 1 and the second coil 2 are partially stacked.

[0049] The avoidance part 3 allows the second coil 2 to extend around the first coil 1 and into the gap 5 between the first coil 1 and the stator core 4. At the same time, the avoidance part 3 can prevent the first coil 1 and the second coil 2 from interfering with each other and causing the first coil 1 to be unable to connect with the stator core 4.

[0050] The first coil 1 and the second coil 2 are both ring structures. The first coil 1 and the second coil 2 are both set to be parallel to the radial plane of the stator core 4, which means that the projections of the first coil 1 and the second coil 2 along the axial direction of the stator core 4 are both rings.

[0051] In the axial direction of the stator core 4, the first coil 1 is located above the second coil 2 to form a two-layer structure. When the first coil 1 and the second coil 2 are arranged in upper and lower layers, the clearance part 3 can provide clearance. In the projection along the axial direction of the stator core 4, the first coil 1 and the second coil 2 partially overlap, so that part of the second coil 2 can extend into the gap 5 between the first coil 1 and the stator core 4.

[0052] Optionally, in another embodiment of this disclosure, both the first coil 1 and the second coil 2 are configured to be parallel to the axis of the stator core 4. The second coil 2 has a protrusion that extends into the gap 5 between the first coil 1 and the stator core 4. The first coil 1 and the second coil 2 are arranged side-by-side adjacent to each other, and the protrusion of the second coil 2 extends into the first coil 1.

[0053] It should be noted that the first coil 1 and the second coil 2 are parallel to the axis of the stator core 4. In this case, the first coil 1 and the second coil 2 can be partially stacked in the axial direction of the stator core 4, or partially stacked in the radial direction of the stator core 4. This depends on whether the first coil 1 has a gap with the outer wall of the stator core 4, or whether the first coil 1 has a gap with a plane of the stator core 4 perpendicular to the axis.

[0054] To facilitate manufacturing, in one embodiment of this disclosure, the clearance portion 3 is configured as a receiving groove formed by a portion of the second coil 2 recessed along the axial direction of the stator core 4, the receiving groove being able to accommodate a portion of the first coil 1.

[0055] In this design, a portion of the second coil 2 is recessed into a receiving groove, which facilitates manufacturing without significantly altering the structure of the second coil 2. The receiving groove also allows the first coil 1 to be easily accommodated when placed above the second coil 2. Furthermore, the recessed receiving groove design of the clearance portion 3 ensures that the clearance portion 3 of the second coil 2 can also conduct current, thereby enhancing the motor's performance.

[0056] Alternatively, in another embodiment of this disclosure, the clearance portion 3 is configured as a clearance opening, allowing a portion of the first coil 1 to pass directly through the second coil 2.

[0057] To reduce the number of solder joints in the coil winding, such as Figure 3 As shown, optionally, in one embodiment of this disclosure, the second coil 2 includes a second outer coil body 22, a second inner coil body 21, a second bridging section 23, and two second electrode connectors 24. The second inner coil body 21 is at least partially located inside the second outer coil body 22. The first end of the second bridging section 23 is connected to the second inner coil body 21, and the second end of the second bridging section 23 is connected to the second outer coil body 22. The two second electrode connectors 24 are respectively connected to the second inner coil body 21 and the second outer coil body 22.

[0058] The second inner ring 21 and the second outer ring 22 are connected as one unit through the second bridging section 23, realizing the electrical conduction of the second inner ring 21 and the second outer ring 22. Thus, only two second electrode connectors 24 need to be set. The two second electrode connectors 24 are electrically connected to the second inner ring 21 and the second outer ring 22 respectively. One second electrode connector 24 is used to introduce current and the other second electrode connector 24 is used to export current, thereby greatly reducing the number of welding points for the coil winding, optimizing the production process, and improving production efficiency.

[0059] In some examples, the second outer ring 22 and the second inner ring 21 can be formed by winding two flat copper wires and then connecting and fixing them through the second bridging section 23. In other examples, the second outer ring 22 and the second inner ring 21 can be formed by winding a single flat copper wire, wherein the second bridging section 23 is formed by bending the flat copper wire, so that the second outer ring 22 and the second inner ring 21 form an inner and outer double-layer structure.

[0060] like Figure 3 As shown, optionally, in one embodiment of this disclosure, the second inner ring body 21 includes a third inner side section 211, a third outer side section 212, and two third straight sections 213. The first ends of the two third straight sections 213 are respectively connected to the two ends of the third inner side section 211, and the second ends of the two third straight sections 213 are respectively connected to the two ends of the third outer side section 212.

[0061] The second outer ring body 22 includes a fourth inner section 221, a fourth outer section 222, and two fourth straight sections 223. The first ends of the two fourth straight sections 223 are respectively connected to the two ends of the fourth inner section 221, and the second ends of the two fourth straight sections 223 are respectively connected to the two ends of the fourth outer section 222.

[0062] The length of the third inner segment 211 is less than the length of the fourth inner segment 221 and the third outer segment 212. The length of the third outer segment 212 is less than the length of the fourth outer segment 222. The length of the fourth inner segment 221 is less than the length of the fourth outer segment 222. The length of the third straight segment 213 is less than the length of the fourth straight segment 223.

[0063] This configuration allows the second coil 2 to form a fan-shaped structure, which is beneficial for adapting to the annular structure of the stator core 4.

[0064] In some examples, the third inner segment 211 and the fourth inner segment 221 are close to the axis of the stator core 4, while the third outer segment 212 and the fourth outer segment 222 are away from the axis of the stator core 4. Here, "inner" refers to the side located on the inner ring wall of the stator core 4, and "outer" refers to the side located on the outer ring wall of the stator core 4. The third inner segment 211, the third outer segment 212, the fourth inner segment 221, and the fourth outer segment 222 can be arc-shaped or straight.

[0065] To reduce the radial occupancy of the stator core 4 and to facilitate the insertion of part of the second coil 2 into the gap 5, as follows: Figure 3 As shown, optionally, in one embodiment of this disclosure, the second inner ring body 21 is stacked on the side of the second outer ring body 22 near the axis of the stator core 4 in the axial direction of the stator core 4, and is recessed along the axial direction of the stator core 4 to form a first groove 25.

[0066] The second inner ring body 21 is stacked on the side of the second outer ring body 22 away from the axis of the stator core 4 in the direction of the axis of the stator core 4, and is recessed along the direction of the axis of the stator core 4 to form a second groove 26. The first groove 25 and the second groove 26 together constitute the clearance part 3.

[0067] In this configuration, on the axial direction of the stator core 4, the side of the second inner ring body 21 closest to the axis of the stator core 4 is positioned above the side of the second outer ring body 22 closest to the axis of the stator core 4. This avoids the side of the second inner ring body 21 and the second outer ring body 22 near the axis of the stator core 4 occupying too much space near the axis of the stator core 4. This allows the portion of the second inner ring body 21 and the second outer ring body 22 near the axis of the stator core 4 to extend into the gap 5 between the first coil 1 and the inner ring wall of the stator core 4, thereby improving the utilization rate of this gap 5.

[0068] The side of the second inner ring body 21 away from the axis of the stator core 4 is positioned above the side of the second outer ring body 22 away from the axis of the stator core 4. This avoids the side of the second inner ring body 21 and the second outer ring body 22 away from the axis of the stator core 4 occupying too much space away from the axis of the stator core 4. This allows the portion of the second inner ring body 21 and the second outer ring body 22 away from the axis of the stator core 4 to extend into the gap 5 between the first coil 1 and the outer ring wall of the stator core 4, thereby improving the utilization rate of this gap 5.

[0069] By setting it up in this way, the space occupied by the axial flux motor in the radial direction of the stator core 4 can be reduced, and the width of the gap 5 between the first coil 1 and the stator core 4 can be avoided too much. At the same time, it can make use of the gap 5 between the inner ring wall and the outer ring wall of the first coil 1 and the stator core 4.

[0070] By forming the avoidance part 3 together with the first groove 25 and the second groove 26, which is the receiving groove in the above embodiment, it is advantageous for the first coil 1 to be placed on the second coil 2 in the axial direction of the stator core 4, and the height of the first coil 1 and the second coil 2 after stacking is reduced, thereby reducing the length occupied in the axial direction of the stator core 4.

[0071] In some examples, the third inner section 211 of the above embodiment is stacked on the fourth inner section 221 in the axial direction of the stator core 4 and recessed in the axial direction of the stator core 4 to form a first groove 25, and the third outer section 212 is stacked on the fourth outer section 222 in the axial direction of the stator core 4 and recessed in the axial direction of the stator core 4 to form a second groove 26.

[0072] like Figure 3As shown, optionally, in one embodiment of this disclosure, the first end of the second bridging segment 23 is connected to the side of the second inner ring body 21 away from the axis of the stator core 4, the second end of the second bridging segment 23 is connected to the side of the second outer ring body 22 away from the axis of the stator core 4, and the second bridging segment 23 is inclined along the axial direction of the stator core 4.

[0073] Among them, the two third straight sections 213 and the two fourth straight sections 223 are used to connect with the mounting slots 41 on the stator core 4. Therefore, the second bridging section 23 is not connected to the third straight section 213 and the fourth straight section 223. This arrangement can ensure the connection and fixation between the second coil 2 and the stator core 4 and avoid mutual interference.

[0074] Since the side of the second inner ring body 21 away from the axis of the stator core 4 and the side of the second outer ring body 22 away from the axis of the stator core 4 are stacked vertically, the second bridging section 23 is inclined in the axial direction of the stator core 4, which facilitates the connection of the second bridging section 23 with the second inner ring body 21 and the second outer ring body 22 respectively.

[0075] Optionally, in another embodiment of this disclosure, the first end of the second bridging segment 23 is connected to the side of the second inner ring body 21 near the axis of the stator core 4, the second end of the second bridging segment 23 is connected to the side of the second outer ring body 22 near the axis of the stator core 4, and the second bridging segment 23 is inclined along the axial direction of the stator core 4.

[0076] In this embodiment, the second bridging section 23 can be located on the side close to the axis of the stator core 4. Since the side of the second inner ring body 21 close to the axis of the stator core 4 and the side of the second outer ring body 22 close to the axis of the stator core 4 are also stacked vertically, the second bridging section 23 is inclined in the axial direction of the stator core 4, which can also achieve the effect of ensuring connection strength and facilitating connection.

[0077] To reduce the number of solder joints in the coil winding, such as Figure 2 As shown, optionally, in one embodiment of this disclosure, the first coil 1 includes a first outer coil body 12, a first inner coil body 11, a first bridging section 13, and two first electrode connectors 14. The first outer coil body 12 is sleeved on the first inner coil body 11. The first end of the first bridging section 13 is connected to the first inner coil body 11, and the second end of the first bridging section 13 is connected to the first outer coil body 12. The two first electrode connectors 14 are respectively connected to the first inner coil body 11 and the first outer coil body 12.

[0078] In this design, both the first outer ring 12 and the first inner ring 11 are annular structures. The first outer ring 12 surrounds the second inner ring 21, and the first outer ring 12 and the first inner ring 11 are connected into a whole through the first bridging section 13, realizing electrical conduction between the first inner ring 11 and the first outer ring 12. Thus, only two first electrode connectors 14 are needed. The two first electrode connectors 14 are electrically connected to the first inner ring 11 and the first outer ring 12, respectively. One first electrode connector 14 is used to introduce current, and the other first electrode connector 14 is used to export current. By setting it up in this way, the number of welding points for the coil winding is greatly reduced, the production process is optimized, and the production efficiency can be improved.

[0079] In some examples, the first outer ring 12 and the first inner ring 11 can be formed by winding two flat copper wires and then connecting and fixing them through the first bridging section 13. In other examples, the first outer ring 12 and the first inner ring 11 can be formed by winding a single flat copper wire, wherein the first bridging section 13 is formed by bending the flat copper wire, so that the first outer ring 12 and the first inner ring 11 form an inner and outer double-layer structure.

[0080] like Figure 2 As shown, optionally, in one embodiment of this disclosure, the first inner ring body 11 includes a first inner side segment 111, a first outer side segment 112 and two first straight segments 113, the first ends of the two first straight segments 113 are respectively connected to the two ends of the first inner side segment 111, and the second ends of the two first straight segments 113 are respectively connected to the two ends of the first outer side segment 112.

[0081] The first outer ring body 12 includes a second inner section 121, a second outer section 122, and two second straight sections 123. The first ends of the two second straight sections 123 are respectively connected to the two ends of the second inner section 121, and the second ends of the two second straight sections 123 are respectively connected to the two ends of the second outer section 122.

[0082] The length of the first inner segment 111 is less than the length of the second inner segment 121 and the first outer segment 112. The length of the first outer segment 112 is less than the length of the second outer segment 122. The length of the second inner segment 121 is less than the length of the second outer segment 122. The length of the first straight segment 113 is less than the length of the second straight segment 123.

[0083] This configuration allows the first coil 1 to form a fan-shaped structure, which is conducive to adapting to the annular structure of the stator core 4.

[0084] In some examples, the first inner segment 111 and the second inner segment 121 are close to the axis of the stator core 4, while the first outer segment 112 and the second outer segment 122 are away from the axis of the stator core 4. Here, "inner" refers to the side located on the inner ring wall of the stator core 4, and "outer" refers to the side located on the outer ring wall of the stator core 4. The first inner segment 111, the first outer segment 112, the second inner segment 121, and the second outer segment 122 can be arc-shaped or straight.

[0085] To facilitate the connection and fixation of the first coil 1 to the stator cell, such as Figure 2 As shown, optionally, in one embodiment of this disclosure, the first end of the first bridging segment 13 is connected to the side of the first inner ring body 11 away from the axis of the stator core 4, and the second end of the first bridging segment 13 is connected to the side of the first outer ring body 12 away from the axis of the stator core 4, and the first bridging segment 13 is inclined along the radial direction of the stator core 4; or, the first end of the first bridging segment 13 is connected to the side of the first inner ring body 11 near the axis of the stator core 4, and the second end of the first bridging segment 13 is connected to the side of the first outer ring body 12 near the axis of the stator core 4, and the first bridging segment 13 is inclined along the radial direction of the stator core 4.

[0086] The first inner ring 11 and the first outer ring 12 are integrally nested. Therefore, the first bridging section 13 is inclined along the radial direction of the stator core 4 to connect the first inner ring 11 and the first outer ring 12. Similarly, the first bridging section 13 is not connected to the first straight section 113 and the second straight section 123, which ensures the connection and fixation between the first coil 1 and the stator core 4 and avoids mutual interference.

[0087] The connection of the first bridging section 13 to either the side of the first inner ring body 11 near the stator core 4 and the side of the first outer ring body 12 near the stator core 4, or to the side of the first inner ring body 11 away from the stator core 4 and the side of the first outer ring body 12 away from the stator core 4, can be selected and set according to actual needs.

[0088] To facilitate the insertion of a portion of the second coil 2 into the gap 5 between the first coil 1 and the stator core 4, and to reduce the space occupied in the radial direction of the stator core 4, optionally, in one embodiment of this disclosure, the straight-line distance between the end of the second coil 2 away from the axis of the stator core 4 and the axis of the stator core 4 is less than the straight-line distance between the end of the first coil 1 away from the axis of the stator core 4 and the axis of the stator core 4.

[0089] It is understandable that when the first coil 1 and the second coil 2 are installed on the stator core 4, the farthest end of the second coil 2 from the axis of the stator core 4 is closer to the axis of the stator core 4 than the farthest end of the first coil 1 from the axis of the stator core 4. This allows part of the second coil 2 to extend into the gap 5 between the first coil 1 and the outer ring wall of the stator core 4. It also ensures that only the size of the first coil 1 needs to be guaranteed to ensure the space occupied in the radial direction of the stator core 4.

[0090] It should be noted that the dimensions of the first coil 1 are related to the dimensions of the wound copper wire.

[0091] In related technologies, coil windings are mostly made of round copper wire. In order to reduce space occupation, in one embodiment of this disclosure, the first coil 1 and the second coil 2 are optionally made of flat copper wire.

[0092] In some examples, the first coil 1 and the second coil 2 are both multi-layered coils wound with flat copper wire. The number of layers in the first coil 1 and the second coil 2 can be 6 layers, or it can be 1 layer, 2 layers, 3 layers, etc., depending on the actual needs.

[0093] It should be noted that when the first coil 1 and the second coil 2 have a structure of two or more layers, in the above embodiment, the third inner section 211, the third outer section 212, the fourth inner section 221, and the fourth outer section 222 have a multi-layer structure in the radial direction of the stator core 4 due to the recessed design. The third straight section 213 and the fourth straight section 223 have a multi-layer structure in the axial direction of the stator core 4.

[0094] In the above-described embodiments, the first inner section 111, the first outer section 112, the first straight section 113, the second inner section 121, the second outer section 122, and the second straight section 123 are all multi-layered structures in the axial direction of the stator core 4.

[0095] like Figure 4 and Figure 5 As shown, a second aspect of this disclosure also provides a stator assembly, including a stator core 4 and a plurality of the above-described coil windings. The stator core 4 has a plurality of mounting slots 41, and the first coil 1 and the second coil 2 of each coil winding are respectively connected to the mounting slots 41.

[0096] In this configuration, multiple first coils 1 are arranged in a ring-shaped interval around the axis of the stator core 4. Each first coil 1 has a gap 5 between its inner and outer ring walls and the stator core 4. A second coil 2 is provided between each two adjacent first coils 1, and a portion of the second coil 2 is located within the gap 5 between each of the two adjacent first coils 1 and the stator core 4.

[0097] In this configuration, multiple second coils 2 are also arranged in a ring-shaped interval around the axis of the stator core 4. The two sides of the end of each second coil 2 closest to the stator core 4 can respectively extend into the gap 5 between the two first coils 1 on both sides of the second coil 2 and the inner ring wall of the stator core 4. The two sides of the end of each second coil 2 furthest from the stator core 4 can respectively extend into the gap 5 between the two first coils 1 on both sides of the second coil 2 and the outer ring wall of the stator core 4.

[0098] In this embodiment, multiple mounting slots 41 are distributed in a ring-shaped interval along the axis of the stator core 4. The mounting slots 41 are used for mounting and positioning the first coil 1 and the second coil 2. In some examples, the first coil 1 or the second coil 2 is mounted in multiple mounting slots 41. Based on the above embodiment, the two first straight segments 113 and the two second straight segments 123 of the first coil 1 are respectively connected to four mounting slots 41, and the two third straight segments 213 and the two fourth straight segments 223 of the second coil 2 are respectively connected to four mounting slots 41. Therefore, the number of mounting slots 41 is related to the number of the first coil 1 and the second coil 2. The number of the first coil 1 and the second coil 2 can be set according to the specific number of phases of the motor.

[0099] Optionally, in one embodiment of this disclosure, the first coil 1 and the second coil 2 of every two coil windings are connected in parallel or in series, so that every two coil windings constitute a phase.

[0100] In some examples, the two first coils 1 and two second coils 2 of two coil windings in one phase can be connected in parallel to form four parallel branches. Of course, the first coils 1 and two second coils 2 of the two coil windings can also be connected in parallel to form two parallel branches, or the two first coils 1 and two second coils 2 of the two coil windings can be connected in series to form a whole branch. The specific settings can be selected according to actual needs, and there are no further restrictions here.

[0101] Optionally, in one embodiment of this disclosure, the stator assembly further includes an electrical connection assembly that electrically connects a plurality of winding coils.

[0102] Optionally, in one embodiment of this disclosure, the number of stator cores 4 can be multiple, with multiple stator cores 4 spliced ​​together, each stator core 4 having multiple coil windings, and the corresponding number of electrical connection components is also multiple.

[0103] A third aspect of this disclosure also provides an axial flux motor, including the stator assembly described above.

[0104] A fourth aspect of this disclosure also provides a vehicle including the stator assembly described above, or the axial flux motor described above.

[0105] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0106] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0107] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A coil winding, characterized in that, The device includes a first coil and a second coil, both of which are connected to a stator core. A gap exists between the first coil and the stator core, and a portion of the second coil extends into the gap, such that the first coil and the second coil are partially stacked in the radial direction and / or axial direction of the stator core. Both the first coil and the second coil are configured to be parallel to the radial plane of the stator core. The second coil has a clearance portion that allows the first coil to pass through it. The coil winding is used in an axial flux motor. The clearance portion is constructed as a receiving groove formed by a portion of the second coil recessed along the axial direction of the stator core, and the receiving groove can accommodate a portion of the first coil.

2. The coil winding according to claim 1, characterized in that, The first coil and / or the second coil includes an outer coil body and an inner coil body, wherein the inner coil body is nested within the outer coil body.

3. The coil winding according to claim 1, characterized in that, In the axial direction of the stator core, a portion of the first coil is positioned above a portion of the second coil; In the radial direction of the stator core, the first coil and the second coil are partially stacked.

4. The coil winding according to claim 3, characterized in that, The second coil includes a second outer coil body, a second inner coil body, a second bridging section, and two second electrode connectors. The second inner coil body is at least partially located within the second outer coil body. The first end of the second bridging section is connected to the second inner coil body, and the second end of the second bridging section is connected to the second outer coil body. The two second electrode connectors are respectively connected to the second inner coil body and the second outer coil body.

5. The coil winding according to claim 4, characterized in that, The second inner ring body is stacked on the side of the second outer ring body near the axis of the stator core in the axial direction of the stator core, and is recessed along the axial direction of the stator core to form a first groove. The second inner ring body is stacked on the side of the second outer ring body away from the axis of the stator core in the axial direction of the stator core, and is recessed along the axial direction of the stator core to form a second groove. The first groove and the second groove together constitute the clearance portion.

6. The coil winding according to claim 4, characterized in that, The first end of the second bridging section is connected to the side of the second inner ring body away from the axis of the stator core, and the second end of the second bridging section is connected to the side of the second outer ring body away from the axis of the stator core. The second bridging section is inclined along the axial direction of the stator core; or, The first end of the second bridging section is connected to the side of the second inner ring body near the axis of the stator core, and the second end of the second bridging section is connected to the side of the second outer ring body near the axis of the stator core. The second bridging section is inclined along the axial direction of the stator core.

7. The coil winding according to claim 1, characterized in that, The first coil includes a first outer coil body, a first inner coil body, a first bridging section, and two first electrode connectors. The first outer coil body is sleeved on the first inner coil body. The first end of the first bridging section is connected to the first inner coil body, and the second end of the first bridging section is connected to the first outer coil body. The two first electrode connectors are respectively connected to the first inner coil body and the first outer coil body.

8. The coil winding according to claim 7, characterized in that, The first end of the first bridging section is connected to the side of the first inner ring body away from the axis of the stator core, and the second end of the first bridging section is connected to the side of the first outer ring body away from the axis of the stator core. The first bridging section is inclined along the radial direction of the stator core; or, The first end of the first bridging section is connected to the side of the first inner ring body near the axis of the stator core, and the second end of the first bridging section is connected to the side of the first outer ring body near the axis of the stator core. The first bridging section is inclined along the radial direction of the stator core.

9. The coil winding according to claim 1, characterized in that, The straight-line distance between the end of the second coil furthest from the axis of the stator core and the axis of the stator core is less than the straight-line distance between the end of the first coil furthest from the axis of the stator core and the axis of the stator core.

10. The coil winding according to any one of claims 1-9, characterized in that, The first and second coils are made of flat copper wire.

11. A stator assembly, characterized in that, It includes a stator core and a plurality of coil windings as described in any one of claims 1-10, wherein the stator core is provided with a plurality of mounting slots, and the first coil and the second coil of each coil winding are respectively connected to the mounting slots; In this configuration, a plurality of first coils are arranged in a ring at intervals around the axis of the stator core. Each first coil has a gap between itself and the inner and outer ring walls of the stator core. A second coil is provided between each two adjacent first coils, and portions of the second coils are located within the gaps between the two adjacent first coils and the stator core.

12. The stator assembly according to claim 11, characterized in that, The first and second coils of each pair of coil windings are connected in parallel or in series so that each pair of coil windings constitutes a phase.

13. An axial flux motor, characterized in that, Includes the stator assembly as described in claim 11 or 12.

14. A vehicle, characterized in that, This includes the stator assembly as described in claim 11 or 12, or the axial flux motor as described in claim 13.

Images