Stator assembly and flat wire motor

Abstract

A stator assembly and a flat wire motor relate to the technical field of motor manufacturing. The stator assembly comprises a stator iron core and a stator winding, M stator grooves are distributed in the inner wall of the stator iron core in the circumferential direction, the stator grooves penetrate through the stator iron core in the axial direction of the stator iron core, and each stator groove comprises N groove layers distributed in the radial direction of the stator iron core; the stator winding comprises three phases of windings mounted on the stator core, and each phase of winding comprises a plurality of flat wire hairpins connected to the M stator slots; wherein the flat wire hairpin in each phase winding comprises a plurality of same-layer hairpins and a plurality of cross-layer hairpins; along the radial direction of the stator iron core, the hairpins on the same layer in each phase winding are located on the outermost groove layer and the innermost groove layer, and the cross-layer hairpins are located on the middle groove layer. According to the stator assembly, the three-phase winding is arranged in a form of combining the same-layer hairpin and the cross-layer hairpin, so that the production process and flow are simplified, and the production efficiency and the product yield are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor manufacturing, in particular to a stator assembly and a flat wire motor. Background Art

[0002] With the accelerated development of the new energy vehicle industry, motors directly determine key vehicle performance indicators such as gradeability, acceleration, and top speed. Flat wire motors, a new technological trend in new energy vehicle motors, are shaping the future of passenger car motors. While round wire motors typically have a slot fill factor of around 50%, the flat wire windings of flat wire motors can achieve a slot fill factor exceeding 70%, fully utilizing the space within the motor structure. This means that within the same stator slot space, the flat wire windings can pack more copper wire, allowing for greater current carrying capacity and generating a higher armature magnetic potential, thereby increasing the motor's torque density and overall efficiency.

[0003] The three-phase output method of the stator assembly of the traditional flat wire motor is to set three phase copper bars, and the phase copper bars are set at the end of the flat wire winding. This setting method causes the end height of the flat wire winding to be too high, which is not convenient for the installation of the stator assembly. At the same time, the setting of the phase copper bars also increases the production cost and production time of the stator assembly, reducing production efficiency; at the same time, there are multiple welding points on the phase copper bars, and the process requirements for cutting the head during the manufacturing process are relatively high and there are relatively many welding points. The quality of welding directly affects the stability of the product, thereby reducing the product yield. Utility Model Content

[0004] The purpose of the utility model is to provide a stator assembly and a flat wire motor. By arranging the three-phase winding in a combination of same-layer clipping and cross-layer clipping, the setting of the phase wire copper bar is eliminated, the copper bar material and the time for welding the copper bar are saved, the production process and procedures are simplified, and the production efficiency and product yield are improved.

[0005] The embodiment of the present utility model is achieved as follows:

[0006] According to one aspect of the present invention, a stator assembly is provided, comprising a stator core and a stator winding, wherein M stator slots are distributed circumferentially on the inner wall of the stator core, the stator slots penetrate the stator core in the axial direction of the stator core, and the stator slots include N slot layers distributed radially along the stator core, wherein M is a multiple of 3 and an even number, and N is an even number equal to or greater than 4; the stator winding includes a three-phase winding installed on the stator core, each phase winding includes a plurality of flat wire hairpins connected to the M stator slots; wherein the flat wire hairpins in each phase winding include a plurality of same-layer hairpins and a plurality of cross-layer hairpins; along the radial direction of the stator core, the same-layer hairpins in each phase winding are located in the outermost and innermost slot layers, the cross-layer hairpins are located in the middle slot layer, and the slot layers where the conductor portions of a pair of slots of the same-layer hairpins are located are the same two slot layers, and the slot layers where the conductor portions of a pair of slots of the cross-layer hairpins are located are adjacent two slot layers.

[0007] Optionally, the flat wire hairpin includes a pair of in-slot conductor parts and a bending part, the pair of in-slot conductor parts are arranged at intervals, the two ends of the bending part are respectively connected to the same end of the pair of in-slot conductor parts, and a welding point is provided at one end of the in-slot conductor part away from the bending part; each slot layer of each stator slot accommodates an in-slot conductor part.

[0008] Optionally, the hairpin on the same layer has an arc bending portion on the conductor part of the slot in the outermost slot layer, and the hairpin on the same layer has an arc bending portion on the conductor part of the slot in the innermost slot layer. The arc bending portion is located at the connection between the conductor part in the slot and the bending portion, and the opening of the arc bending portion is arranged to face away from the slot layer in the middle.

[0009] Optionally, the span of the same-layer card issuance is h, and the span of the cross-layer card issuance is h; each phase winding is a full-pitch winding, and the full-pitch span is h.

[0010] Optionally, the three-phase stator windings are symmetrically distributed, and each phase winding is separated by two stator slots.

[0011] Optionally, the inner wall of the stator core is provided with insulating slot paper, and the shape and size of the insulating slot paper match the shape and size of the inner wall of the stator core to cover the inner wall of the stator core.

[0012] Optionally, the stator assembly also includes a star point copper busbar, which is arranged at the end of the stator core, and the terminal of the star point copper busbar is arranged in parallel with the flat wire hairpin of the three-phase winding of the stator core, and the star point copper busbar is connected to the tail of the three-phase winding through the terminal.

[0013] Optionally, the stator assembly further includes an outgoing copper bar, which is arranged at the end of the stator core and is connected to an external three-phase power supply line; the pole-connected lines of the three-phase winding of the stator winding are respectively connected to the outgoing copper bar through the star point copper bar.

[0014] Optionally, the inner wall of the stator core of the stator assembly has 54 stator slots distributed circumferentially, and the stator slots include 4 slot layers distributed radially along the stator core, and the 4 slot layers are radially arranged from the opening of the stator slots to the first slot layer, the second slot layer, the third slot layer and the fourth slot layer; the stator assembly is configured to match a motor with 6 poles; the same-layer hairpins in each phase winding are located in the first slot layer and the fourth slot layer distributed radially along the stator core; the cross-layer hairpins are located in the second slot layer and the third slot layer.

[0015] Another aspect of the present invention provides a flat wire motor, comprising a rotor and a stator assembly, wherein the rotor is rotatably disposed inside the stator assembly.

[0016] The beneficial effects of the present invention include at least one of the following:

[0017] The present application provides a stator assembly, including a stator core and a stator winding, wherein M stator slots are distributed circumferentially on the inner wall of the stator core, the stator slots penetrate the stator core along the axial direction of the stator core, and the stator slots include N slot layers distributed radially along the stator core, wherein M is a multiple of 3 and an even number, and N is an even number equal to or greater than 4; the stator winding includes a three-phase winding installed on the stator core, each phase winding includes a plurality of flat wire hairpins connected to the M stator slots; wherein the flat wire hairpins in each phase winding include a plurality of same-layer hairpins and a plurality of cross-layer hairpins; along the radial direction of the stator core, the same-layer hairpins in each phase winding are located in the outermost and innermost slot layers, the cross-layer hairpins are located in the middle slot layer, and the slot layers where the conductor parts of a pair of slots of the same-layer hairpins are located are the same two slot layers, and the slot layers where the conductor parts of a pair of slots of the cross-layer hairpins are located are adjacent two slot layers. The stator assembly obtained by the above design eliminates the setting of phase copper busbars by setting the three-phase winding in a combination of same-layer and cross-layer card issuance, saves copper busbar materials and the time for welding copper busbars, simplifies the production process and improves production efficiency and product yield.

[0018] The present application also provides a flat wire motor, comprising a rotor and a stator assembly, wherein the rotor is rotatably disposed inside the stator assembly. The stator assembly of the motor simplifies the production process and improves the production efficiency and product yield of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1An exploded view of a stator assembly provided in an embodiment of the present utility model;

[0021] Figure 2 A schematic structural diagram of a stator assembly provided in an embodiment of the present utility model;

[0022] Figure 3 A top view of a stator assembly provided in an embodiment of the present utility model;

[0023] Figure 4 This is one of the structural schematic diagrams of the same-layer card issuance of the stator assembly provided by an embodiment of the present utility model;

[0024] Figure 5 This is a second structural diagram of the same-layer card issuing of the stator assembly provided by an embodiment of the present utility model;

[0025] Figure 6 A schematic structural diagram of a cross-layer card issuing device for a stator assembly according to an embodiment of the present invention;

[0026] Figure 7 A schematic structural diagram of a stator core of a stator assembly provided in an embodiment of the present utility model;

[0027] Figure 8 This is an enlarged view of the details at A;

[0028] Figure 9 A schematic diagram of a three-phase winding of a stator assembly provided in an embodiment of the present invention;

[0029] Figure 10 A schematic diagram of the insertion of a flat wire hairpin of a stator assembly provided in an embodiment of the present utility model.

[0030] Icons: 100- stator assembly; 110- stator core; 111- stator slot; 1111- slot layer; 120- stator winding; 121- flat wire hairpin; 121a- same-layer hairpin; 121b- cross-layer hairpin; 1211- conductor part in the slot; 1212- bending part; 1213- arc bending part; 130- insulating slot paper; 140- star point copper busbar; 150- outgoing copper busbar. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0036] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] Please refer to Figure 1This embodiment provides a stator assembly 100, including a stator core 110 and a stator winding 120. The inner wall of the stator core 110 has M stator slots 111 distributed along the circumferential direction. The stator slots 111 penetrate the stator core 110 along the axial direction of the stator core 110, and the stator slots 111 include N slot layers 1111 distributed along the radial direction of the stator core 110, where M is an even number that is a multiple of 3 and N is an even number that is equal to or greater than 4; the stator winding 120 includes a three-phase winding installed on the stator core 110, and each phase winding includes a plurality of flat wire hairpins connected to the M stator slots 111. 121; wherein, the flat wire hairpin 121 in each phase winding includes a plurality of same-layer hairpins 121a and a plurality of cross-layer hairpins 121b; along the radial direction of the stator core 110, the same-layer hairpins 121a in each phase winding are located at the outermost and innermost slot layers 1111, and the cross-layer hairpins 121b are located at the middle slot layer 1111, and the slot layers 1111 where the pair of slot conductor portions 1211 of the same-layer hairpin 121a are located are the same two slot layers 1111, and the slot layers 1111 where the pair of slot conductor portions 1211 of the cross-layer hairpin 121b are located are adjacent two slot layers 1111.

[0038] Specifically, please refer to Figure 1 The stator assembly 100 provided in the first aspect of the embodiment of the present application includes a stator core 110 and a stator winding 120, wherein, as Figure 9 As shown, the stator winding 120 includes three phase windings: a first phase winding, a second phase winding, and a third phase winding. The three phase windings are electrically different in phase. The stator winding 120 is mounted on the stator core 110. In one optional embodiment of the present application, the three-phase stator winding 120 is symmetrically distributed, with each phase winding separated by two stator slots 111, so that the windings of different phases are cross-symmetrically distributed.

[0039] like Figure 1 As shown, the stator core 110 has a hollow cylindrical structure with an aperture extending axially through both ends. The inner wall of the stator core 110 is circumferentially provided with M stator slots 111. The stator slots 111 extend through the inner wall of the stator core 110 to form strip-shaped slots with both ends connected to the exterior. The M stator slots 111 are evenly distributed along the circumference, with a predetermined spacing between adjacent stator slots 111. M is an even multiple of 3. Each stator slot 111 includes N slot layers 1111 distributed radially along the stator core 110, where N is an even number greater than or equal to 4.

[0040] In a specific embodiment of the present application, a stator assembly 100 is provided. The number of stator slots 111 of the stator assembly 100 is 54, and each stator slot 111 includes 4 slot layers 1111. The stator core 110 can be used for a motor with 8 poles.

[0041] The stator winding 120 includes three-phase windings installed in the stator core 110, such as Figure 1 and Figure 2 As shown, each phase winding includes multiple flat wire hairpins 121 connected to the stator slots 111. The flat wire hairpins 121 are divided into two types: same-layer hairpins 121a and cross-layer hairpins 121b. Each flat wire hairpin 121 includes a pair of in-slot conductors 1211 inserted into different stator slots 111. Each slot layer 1111 within each stator slot 111 houses one in-slot conductor 1211.

[0042] Among them, the same-layer hairpin 121a is located in the outermost and innermost slot layers 1111, and the slot layers 1111 where the pair of slot conductor parts 1211 of the same-layer hairpin 121a are located are the same two slot layers 1111; the cross-layer hairpin 121b is located in the middle slot layer 1111, and the slot layers 1111 where the pair of slot conductor parts 1211 of the cross-layer hairpin 121b are located are adjacent two slot layers 1111.

[0043] In a specific embodiment, Figure 7 and Figure 8 As shown, each stator slot 111 includes four slot layers 1111, wherein the slot layers 1111 of the stator slot 111 are radially arranged from the opening of the stator slot 111 to the first slot layer 1111, the second slot layer 1111, the third slot layer 1111 and the fourth slot layer 1111, wherein Figure 10 As shown, it illustrates a schematic diagram of the wire assembly of the same-layer hairpins 121a and the cross-layer hairpins 121b in a stator assembly 100 with 54 stator slots and 4 slot layers, wherein the same-layer hairpins 121a in each phase winding are located in the first slot layer 1111 and the fourth slot layer 1111 distributed radially along the stator core 110; the cross-layer hairpins 121b are located in the second slot layer 1111 and the third slot layer 1111.

[0044] It should be noted that if Figure 1 and Figure 2 As shown, in one possible embodiment of the present application, first, the stator assembly 100 also includes a star point copper bus 140, which is arranged at the end of the stator core 110, and the terminal of the star point copper bus 140 is arranged in parallel with the flat wire hairpin 121 of the three-phase winding of the stator core 110, and the star point copper bus 140 is connected to the tail of the three-phase winding through the terminal, forming a tail connection mode of the star-connected winding.

[0045] The star point copper bar 140 in the stator assembly 100 primarily serves as a connection and conduction device. Preferably, in one practical connection method of the present application, the ends of the three-phase windings are connected together to form a common point, called the neutral point. The star point copper bar 140 is connected to this neutral point and serves to collect and distribute the current at the neutral point.

[0046] Second, if Figure 1 and Figure 2 As shown, the stator assembly 100 also includes an outgoing copper bar 150, which is arranged at the end of the stator core 110 and is connected to the external three-phase power line; the three-phase winding pole-connecting lines of the stator winding 120 are respectively connected to the outgoing copper bar 150 through the star point copper bar 140.

[0047] Third, the span of the same-layer hairpin 121a is h, and the span of the cross-layer hairpin 121b is h; each phase winding is a full-pitch winding, and the full-pitch span is h.

[0048] The stator assembly 100 obtained by the above design eliminates the setting of the phase copper busbar by setting the three-phase winding as a combination of the same-layer hairpin 121a and the cross-layer hairpin 121b, saves the copper busbar material and the time for welding the copper busbar, simplifies the production process and improves production efficiency and product yield.

[0049] In one embodiment of the present application, please refer to Figure 4 、 Figure 5 and Figure 6 The flat wire hairpin 121 includes a pair of in-slot conductor parts 1211 and a bending part 1212. The pair of in-slot conductor parts 1211 are arranged at intervals, and the two ends of the bending part 1212 are respectively connected to the same end of the pair of in-slot conductor parts 1211. A welding point is provided at the end of the in-slot conductor part 1211 away from the bending part 1212; each slot layer 1111 of each stator slot 111 accommodates an in-slot conductor part 1211.

[0050] Specifically, please refer to Figure 4 、 Figure 5 and Figure 6 The flat wire hairpin 121 includes a pair of parallel, spaced-apart in-slot conductor sections 1211. Each in-slot conductor section 1211 is configured to be installed in a corresponding slot layer 1111 of the stator slot 111. The two in-slot conductor sections 1211 are connected by a bend 1212. The ends of the bend 1212 are connected to the same end of the pair of in-slot conductor sections 1211. A welding point is provided at the end of the in-slot conductor section 1211 away from the bend 1212. During the production process of the stator assembly 100, a bending device is used to convert a straight flat wire conductor into a flat wire conductor with a U-shaped bend 1212. An arc pressing device is then used to press the flat wire conductor with the bend 1212 into a flat wire conductor with a predetermined curvature at the end.

[0051] The bending portion 1212 of each flat wire hairpin 121 is located on one side of the stator core 110, and the welding point of each flat wire hairpin 121 is located on the other side of the stator core 110. Through this arrangement, the winding of the flat wire hairpin 121 is more orderly and regular.

[0052] The bent portion 1212 can connect two in-slot conductors 1211 , and the welding points can be connected by welding with the welding points of adjacent flat wire hairpins 121 to connect multiple flat wire hairpins 121 of each phase winding in series.

[0053] Alternatively, as Figure 4 As shown, in one embodiment of the present application, the same-layer hairpin 121a is located in the outermost slot layer 1111 and has an arc bending portion 1213 on the slot conductor portion 1211. The arc bending portion 1213 is located at the connection between the slot conductor portion 1211 and the bending portion 1212. The opening of the arc bending portion 1213 is arranged to face away from the slot layer 1111 located in the middle. Similarly, in another embodiment of the present application, as Figure 4 As shown, the hairpin 121a on the same layer has an arc bending portion 1213 on the conductor portion of the innermost slot layer 1111. The arc bending portion 1213 is located at the connection between the conductor portion 1211 in the slot and the bending portion 1212. The opening of the arc bending portion 1213 is set back to the slot layer 1111 in the middle.

[0054] Specifically, in order to facilitate crossing over adjacent flat wire hairpins 121, the same-layer hairpin 121a has an arcuate bend 1213 on the in-slot conductor portion 1211 of the outermost slot layer 1111. In a specific embodiment, the in-slot conductor portion 1211 of the flat wire hairpin 121 inserted in the fourth slot layer 1111 has an arcuate bend 1213 with an opening facing away from the middle slot layer 1111. Similarly, the in-slot conductor portion 1211 of the flat wire hairpin 121 inserted in the first slot layer 1111 has an arcuate bend 1213 with an opening facing away from the middle slot layer 1111. The arcuate bend 1213 is located at the connection between the in-slot conductor portion 1211 and the bend 1212, so as to facilitate precise crossing over of adjacent flat wire conductors without affecting the insertion of the in-slot conductor portion 1211 into the slot layer 1111. Figure 3 As shown, the structure of the stator assembly 100 is made more compact.

[0055] In one embodiment of the present application, Figure 1 As shown, the inner wall of the stator core 110 is provided with an insulating slot paper 130 , and the shape and size of the insulating slot paper 130 match the shape and size of the inner wall of the stator core 110 to cover the inner wall of the stator core 110 .

[0056] Specifically, during the production process of the stator assembly 100, a creasing tool is used to press multiple creases into the insulating slot paper 130. The creases are then used to fold the insulating slot paper 130 into rectangular insulating slot paper 130. The folded rectangular insulating slot paper 130 is sequentially inserted into the slots of the stator core 110. The shape and size of the insulating slot paper 130 are adapted to the inner wall of the stator core 110.

[0057] Another aspect of the present invention provides a flat wire motor comprising a rotor and a stator assembly 100. The rotor is rotatably disposed within the interior of the stator assembly 100, with the openings of the stator slots 111 of the stator assembly 100 facing inward. Of course, in another embodiment of the present application, the rotor can also be rotatably disposed outside the stator slots 111, with the openings of the stator slots 111 of the stator assembly 100 facing outward. The specific structure and beneficial effects of the stator assembly 100 have been described in detail above and will not be repeated here.

[0058] The stator assembly 100 of the motor simplifies the production process and the production flow, and improves the production efficiency and product yield of the motor.

[0059] The above description is merely an optional embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0060] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A stator assembly, characterized in that: The invention comprises a stator core (110) and a stator winding (120), wherein the inner wall of the stator core (110) is provided with M stator slots (111) distributed along the circumferential direction, the stator slots (111) penetrate the stator core (110) along the axial direction of the stator core (110), and the stator slots (111) include N slot layers (1111) distributed along the radial direction of the stator core (110), wherein M is a multiple of 3 and an even number, and N is an even number equal to or greater than 4; the stator winding (120) comprises a three-phase winding mounted on the stator core (110), each phase winding comprising a plurality of flat wire hairpins (121) connected to the M stator slots (111); wherein each The flat wire hairpins (121) in the phase windings include a plurality of same-layer hairpins (121a) and a plurality of cross-layer hairpins (121b); along the radial direction of the stator core (110), the same-layer hairpins (121a) in each phase winding are located in the outermost and innermost slot layers (1111), and the cross-layer hairpins (121b) are located in the middle slot layer (1111); the slot layers (1111) where the pair of slot conductor parts (1211) of the same-layer hairpins (121a) are located are the same two slot layers (1111), and the slot layers (1111) where the pair of slot conductor parts (1211) of the cross-layer hairpins (121b) are located are adjacent two slot layers (1111).

2. The stator assembly according to claim 1, characterized in that The flat wire hairpin (121) comprises a pair of in-slot conductor parts (1211) and a bent part (1212), wherein the pair of in-slot conductor parts (1211) are arranged at intervals, and the two ends of the bent part (1212) are respectively connected to the same end of the pair of in-slot conductor parts (1211), and a welding point is provided at one end of the in-slot conductor part (1211) away from the bent part (1212); and each slot layer (1111) of each stator slot (111) accommodates one in-slot conductor part (1211).

3. The stator assembly according to claim 2, characterized in that The same-layer hairpin (121a) is provided with an arc bending portion (1213) on the conductor portion (1211) in the slot of the outermost slot layer (1111), and the same-layer hairpin (121a) is provided with an arc bending portion (1213) on the conductor portion of the slot of the innermost slot layer (1111). The arc bending portion (1213) is located at the connection between the conductor portion (1211) in the slot and the bending portion (1212), and the opening of the arc bending portion (1213) is arranged to face away from the slot layer (1111) in the middle.

4. The stator assembly according to claim 1, characterized in that The span of the same-layer hairpin (121a) is h, and the span of the cross-layer hairpin (121b) is h; the winding of each phase is a full-pitch winding, and the full-pitch span is h.

5. The stator assembly according to claim 1, characterized in that The three-phase stator windings (120) are symmetrically distributed, and each phase winding is separated by two stator slots (111).

6. The stator assembly according to claim 1, wherein: The inner wall of the stator core (110) is provided with insulating slot paper (130), and the shape and size of the insulating slot paper (130) match the shape and size of the inner wall of the stator core (110) so as to cover the inner wall of the stator core (110).

7. The stator assembly according to claim 1, characterized in that The stator assembly (100) further comprises a star point copper bar (140), the star point copper bar (140) being arranged at the end of the stator core (110), and the terminal of the star point copper bar (140) being arranged in parallel with the flat wire hairpin (121) of the three-phase winding of the stator core (110), and the star point copper bar (140) being connected to the tail of the three-phase winding via the terminal.

8. The stator assembly according to claim 7, characterized in that The stator assembly (100) further comprises an outgoing copper bar (150), which is arranged at the end of the stator core (110) and is connected to an external three-phase power supply line; the three-phase winding pole-connecting lines of the stator winding (120) are respectively connected to the outgoing copper bar (150) through the star point copper bar (140).

9. The stator assembly according to claim 1, wherein: The inner wall of the stator core (110) of the stator assembly (100) has 54 stator slots (111) distributed along the circumferential direction, and the stator slots (111) include four slot layers (1111) distributed along the radial direction of the stator core (110), and the four slot layers (1111) are sequentially arranged along the radial direction from the opening of the stator slot (111) as a first slot layer (1111), a second slot layer (1111), and a third slot layer (1111). and a fourth slot layer (1111); the stator assembly (100) is configured to match a motor with 6 poles; the same-layer hairpins (121a) in the winding of each phase are located in the first slot layer (1111) and the fourth slot layer (1111) distributed along the radial direction of the stator core (110); the cross-layer hairpins (121b) are located in the second slot layer (1111) and the third slot layer (1111).

10. A flat wire motor, characterized in that: The invention comprises a rotor and a stator assembly (100) according to any one of claims 1 to 9, wherein the rotor is rotatably arranged inside the stator assembly (100).

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