Stator assembly and motor

Abstract

The invention discloses a stator assembly and a motor, and the stator assembly is characterized in that an integral-pitch hairpin coil is arranged in a middle-layer space, a short-pitch hairpin coil and an integral-pitch hairpin coil are arranged in an inner-layer space, and a stator winding of the short-pitch hairpin coil is arranged in an outer-layer space, or the integral-pitch hairpin coil is arranged in the middle-layer space, the integral-pitch hairpin coil and the short-pitch hairpin coil are arranged in the inner-layer space, and the integral-pitch hairpin coil is arranged in the outer-layer space. The inner layer space is provided with a long-distance hairpin coil and a whole-distance hairpin coil, and the outer layer space is provided with a winding displacement design of the stator winding of the long-distance hairpin coil, so that the current in each branch winding in the sub-winding can be equal, branch loop current among the branch windings is avoided, the winding temperature rise of the motor in the operation process is reduced, and the service life of the motor is prolonged. The performance of the motor is improved, and the operation efficiency of the motor during operation can be improved. Meanwhile, the flat cable design can be compatible with the stator windings of a plurality of branches, the wire type compatibility of the hairpin coils is high, the processing cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a stator assembly and a motor. Background Technology

[0002] Flat wire motors, due to their advantages such as high slot fill factor, excellent heat dissipation, low winding end height, and low electromagnetic noise, have gradually become a development trend for achieving high efficiency and lightweight drive motors. The winding method of flat wire motors mostly adopts a hairpin type, generally consisting of three parts: the crown end, the straight section, and the soldered end. Each pin wire is connected together through the soldered end to form a complete stator winding structure, ensuring the integrity of the entire winding connection.

[0003] In related technologies, flat-wire motors exhibit a more severe skin effect than round-wire motors. To mitigate the losses caused by the skin effect, the number of conductor layers in the slots is typically increased. However, as the number of flat wire layers increases, the winding connection methods also increase. Inappropriate connection methods can lead to winding inductance imbalance, resulting in winding circulating currents and affecting motor performance. Summary of the Invention

[0004] The main objective of this application is to provide a stator assembly and motor that can eliminate branch current circulation and improve motor performance.

[0005] To achieve the above objectives, this application proposes a stator assembly applied in a motor having Z stator slots and P rotor poles, where each pole occupies Q stator slots in a manner that is Z / P. The stator assembly includes a stator core with a plurality of stator slots evenly distributed on its inner wall. The side of each stator slot facing the center of the stator core is defined as the inner space, and the side of each stator slot away from the center of the stator core is defined as the outer space. The portion between the inner and outer spaces is defined as the intermediate space. A stator winding, comprising a plurality of sub-windings connected in a star or delta configuration, each sub-winding comprising at least one branch winding, characterized in that each branch winding comprises a plurality of hairpin coils connected in series, the intermediate layer space comprising full-pitch hairpin coils, the inner layer space comprising short-pitch hairpin coils and full-pitch hairpin coils, and the outer layer space comprising a stator winding of short-pitch hairpin coils; or, the intermediate layer space comprising full-pitch hairpin coils, the inner layer space comprising long-pitch hairpin coils and full-pitch hairpin coils, and the outer layer space comprising a stator winding of long-pitch hairpin coils.

[0006] In one specific embodiment, the long-pitch hairpin coil spans Q+1 stator slots, and the short-pitch hairpin coil spans Q-1 stator slots.

[0007] In one specific embodiment, the outer space includes the stator winding of the short-pitch hairpin coil, and the outer space also includes the full-pitch hairpin coil.

[0008] In one specific embodiment, the outer space includes the stator winding of the long-pitch hairpin coil, and the outer space also includes the full-pitch hairpin coil.

[0009] In one specific embodiment, the intermediate layer space is provided with a full-pitch hairpin coil, the inner layer space includes a short-pitch hairpin coil and a full-pitch hairpin coil, the outer layer space includes the stator winding of the short-pitch hairpin coil, and each branch winding includes a short-pitch hairpin coil and a full-pitch hairpin coil.

[0010] In one specific embodiment, the intermediate layer space is provided with a full-pitch hairpin coil, the inner layer space includes a long-pitch hairpin coil and a full-pitch hairpin coil, the outer layer space includes the stator winding of the long-pitch hairpin coil, and each branch winding includes a long-pitch hairpin coil and a full-pitch hairpin coil.

[0011] In one specific embodiment, the branch winding includes one branch winding, two branch windings, or four branch windings.

[0012] In one specific embodiment, the hairpin coil includes a U-shaped hairpin coil, which includes a first connecting segment, a first straight segment, a second straight segment, and two first bending segments.

[0013] In one specific embodiment, the first and second straight segments of each U-shaped hairpin coil in the inner space are located within the inner space, and / or the first and second straight segments of each U-shaped hairpin coil in the outer space are located within the outer space.

[0014] In one specific embodiment, the first straight segment and the second straight segment of each of the U-shaped hairpin coils in the intermediate layer space are located in two adjacent intermediate layer spaces.

[0015] In one specific embodiment, the two first straight segments of two adjacent U-shaped hairpin coils within the intermediate layer space are located in two adjacent stator slots, and the two adjacent second straight segments are also located in two adjacent stator slots.

[0016] In one specific embodiment, the hairpin coil includes a bent section extending to one side of the stator core end face, the bent section spanning a stator slot of Q / 2.

[0017] In one specific embodiment, the input and output ends of the stator winding are located in the outer space.

[0018] In one specific embodiment, the first connecting segment includes a first inclined side and a second inclined side. A first bulge protruding towards the outer diameter of the stator core is provided between the first inclined side and the first straight segment of the U-shaped hairpin coil located in the outer space, and / or a second bulge protruding towards the inner diameter of the stator core is provided between the second inclined side and the second straight segment of the U-shaped hairpin coil located in the inner space. The first bulge and / or the second bulge both include a first arc segment, a second arc segment, and a connecting segment.

[0019] In one specific embodiment, the radius of the first arc segment and the second arc segment are both 1.5 to 2 times the narrow side dimension of the U-shaped hairpin coil.

[0020] In one specific embodiment, the backward tilt angle p1 of the first convex hull is ≤60°, and the backward tilt angle p1 is the angle between the extension line of the connecting segment and the normal line of the first hypotenuse in the same projection plane.

[0021] In one specific embodiment, the backward tilt angle p2 of the second convex hull is ≤60°, and the backward tilt angle p2 is the angle between the extension line of the connecting segment and the normal line of the second hypotenuse in the same projection plane.

[0022] In one specific embodiment, a first type I hairpin coil is provided in the inner space, and the first type I hairpin coil has a third protrusion that protrudes towards the outer diameter of the stator core.

[0023] In one specific embodiment, the pitch angle of the third convex hull is ≤60°.

[0024] In one specific embodiment, the stator assembly further includes two core pressure plates, which are correspondingly disposed on two end faces of the stator core along the axial direction. The core pressure plates have an arc-shaped structure, and multiple opening slots are provided on the inner wall of the arc of the core pressure plates. When the core pressure plates are placed on the end faces of the stator core, each opening slot corresponds to each stator slot.

[0025] In one specific embodiment, the opening groove is arranged parallel to the opposite side walls.

[0026] In one specific embodiment, the number of stator slots Z is 72 and the number of rotor poles P is 8.

[0027] This application also provides an electric motor, including: a rotor and a stator assembly as described in any one of the embodiments of this application, wherein the rotor passes through the stator assembly.

[0028] The stator assembly and motor provided in this application feature a stator winding design where a full-pitch hairpin coil is located in the intermediate layer, a short-pitch hairpin coil and a full-pitch hairpin coil are located in the inner layer, and a short-pitch hairpin coil is located in the outer layer. Alternatively, a stator winding design where a full-pitch hairpin coil is located in the intermediate layer, a long-pitch hairpin coil and a full-pitch hairpin coil are located in the inner layer, and a long-pitch hairpin coil is located in the outer layer can ensure equal current in each branch winding within the sub-winding, preventing circulating current between branch windings, reducing winding temperature rise during motor operation, improving motor performance, and increasing operating efficiency. Furthermore, this wiring design is compatible with stator windings of multiple branches, offering high compatibility in hairpin coil wire types, reducing processing costs, and improving production efficiency. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a stator assembly provided in an embodiment of this application;

[0031] Figure 2 for Figure 1 Top view;

[0032] Figure 3 This is a schematic diagram of a circuit structure of a stator winding provided in an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of another circuit structure of a stator winding provided in one embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the structure of a first flat wire conductor provided in an embodiment of this application;

[0035] Figure 6 for Figure 5 A schematic diagram of the structure of the first convex hull in the diagram;

[0036] Figure 7 for Figure 5 A schematic diagram of the structure of the first convex hull in the diagram;

[0037] Figure 8 A schematic diagram of the structure of the first flat conductor and the iron core provided in an embodiment of this application;

[0038] Figure 9This is a schematic diagram of the structure of a second flat wire conductor provided in an embodiment of this application;

[0039] Figure 10 for Figure 9 A schematic diagram of the structure of the second convex hull in the diagram;

[0040] Figure 11 A schematic diagram of the structure of the second flat conductor and the iron core provided in an embodiment of this application;

[0041] Figure 12 This is a schematic diagram of the structure of a third flat wire conductor provided in an embodiment of this application;

[0042] Figure 13 A schematic diagram of the structure of the third flat conductor and the iron core provided in an embodiment of this application;

[0043] Figure 14 This is a schematic diagram of the structure of a fourth flat wire conductor provided in an embodiment of this application;

[0044] Figure 15 for Figure 14 A schematic diagram of the structure of the third convex hull in the diagram;

[0045] Figure 16 This is a schematic diagram of the structure of a fifth flat wire conductor provided in an embodiment of this application;

[0046] Figure 17 This is a schematic diagram of the structure of an insulating layer provided in an embodiment of this application;

[0047] Figure 18 This is a schematic diagram of the branch winding provided in the first embodiment of this application;

[0048] Figure 19 This is a schematic diagram of the branch winding provided in the first embodiment of this application;

[0049] Figure 20 This is a schematic diagram of the branch winding provided in the first embodiment of this application;

[0050] Figure 21 This is a schematic diagram of the branch winding provided in the first embodiment of this application;

[0051] Figure 22 This is a schematic diagram of the wiring of the two branch windings provided in the first embodiment of this application;

[0052] Figure 23 This is a schematic diagram of the wiring arrangement of one branch winding provided in the first embodiment of this application.

[0053] Explanation of icon numbers:

[0054]

[0055]

[0056] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0058] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0059] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0060] The following is a detailed description of this application.

[0061] The following is a detailed description of this application. For example... Figure 1 and combined Figure 2As shown, one embodiment of this application provides a stator assembly 100, which includes a stator core 11 and a stator winding 12. The stator core 11 has a plurality of stator slots 111 evenly distributed on its inner wall. The side of the stator slot 111 facing the center of the stator core 11 is defined as the inner space, the side of the stator slot 111 away from the center of the stator core 11 is defined as the outer space, and the portion between the inner and outer spaces is defined as the intermediate space. The stator winding 12 includes a plurality of sub-windings 121 connected in a star or delta configuration, each sub-winding 121 comprising multiple sub-windings connected in series. At least one branch winding 1211 may be connected in parallel; each branch winding 1211 includes multiple hairpin coils 13 connected in series. The stator assembly 100 is applied in a motor with Z stator slots 111 and P rotor poles. The number of stator slots Q occupied by each pole is Z / P. Understandably, full pitch is the number of stator slots occupied by one pole, short pitch is less than the number of stator slots occupied by one pole, and long pitch is greater than the number of stator slots occupied by one pole. The hairpin coils 13 are classified into short-pitch hairpin coils, full-pitch hairpin coils, and long-pitch hairpin coils according to their span. In this embodiment, the intermediate layer space contains full-pitch hairpin coils, the inner layer space contains short-pitch and full-pitch hairpin coils, and the outer layer space contains stator windings with short-pitch hairpin coils; or, the intermediate layer space contains full-pitch hairpin coils, the inner layer space contains long-pitch and full-pitch hairpin coils, and the outer layer space contains stator windings with long-pitch hairpin coils.

[0062] For ease of explanation, this application will be described in the form of two major embodiments. In the first embodiment, the hairpin coil includes only the form of a full-pitch hairpin coil and a short-pitch hairpin coil. In the second embodiment, the hairpin coil includes only the form of a full-pitch hairpin coil and a long-pitch hairpin coil.

[0063] In the first embodiment, a full-pitch hairpin coil is provided in the intermediate layer space, a short-pitch hairpin coil and a full-pitch hairpin coil are provided in the inner layer space, and a short-pitch hairpin coil is provided in the outer layer space. Alternatively, the intermediate layer space may have a full-pitch hairpin coil, the inner layer space may have a short-pitch hairpin coil and a full-pitch hairpin coil, and the outer layer space may have a short-pitch hairpin coil and a full-pitch hairpin coil.

[0064] The second embodiment specifically includes a full-pitch hairpin coil in the intermediate layer, a long-pitch hairpin coil and a full-pitch hairpin coil in the inner layer, and a long-pitch hairpin coil in the outer layer. Alternatively, the intermediate layer may have a full-pitch hairpin coil, the inner layer may have a long-pitch hairpin coil and a full-pitch hairpin coil, and the outer layer may have a long-pitch hairpin coil and a full-pitch hairpin coil.

[0065] In this embodiment, the through hole of the stator core 11 is provided with a plurality of spaced protrusions on the hole wall, and a stator slot 111 is formed between two adjacent protrusions. The stator slot 111 is used to insert a hairpin coil. The plurality of stator slots 111 are evenly distributed along the circumference of the through hole of the stator core 11, and each stator slot 111 extends along the axial direction of the stator core 11.

[0066] refer to Figure 2 As shown, each stator slot 111 has M layers arranged radially, and each layer contains a hairpin coil, where M is an even number (M≥4).

[0067] refer to Figure 3 and combined Figure 4 As shown, the stator winding 12 includes at least three-phase windings. Each phase winding is referred to as a sub-winding 121 in this embodiment. The sub-windings 121 can be connected using either a star connection or a delta connection. The star connection method results in a larger equivalent number of turns for the stator winding 12, making it suitable for situations with high motor voltage loads. The delta connection method results in a smaller equivalent number of turns for the stator winding 12, making it suitable for situations with high motor current loads.

[0068] In this embodiment, regardless of whether the stator winding 12 is connected in a star or delta configuration, each phase sub-winding 121 consists of at least one parallel branch winding 1211 or at least one series branch winding 1211. Each branch winding 1211 is composed of several hairpin coils 13 connected in series, ensuring complete symmetry of the inductance among the sub-windings 121 and preventing circulating current from occurring between them. In the following embodiments of the present invention, each phase sub-winding 121 includes four branch windings. With modifications, each phase sub-winding 121 may also include two branch windings or one branch winding.

[0069] In the technical solution of this application embodiment, a stator winding wiring design is adopted, in which a full-pitch hairpin coil is provided in the middle layer space, a short-pitch hairpin coil and a full-pitch hairpin coil are provided in the inner layer space, and a short-pitch hairpin coil is provided in the outer layer space; or, a stator winding wiring design is adopted, in which a full-pitch hairpin coil is provided in the middle layer space, a long-pitch hairpin coil and a full-pitch hairpin coil are provided in the inner layer space, and a long-pitch hairpin coil is provided in the outer layer space. This ensures that the current in each branch winding within the sub-winding is equal, avoiding circulating current between branch windings, reducing winding temperature rise during motor operation, improving motor performance, and increasing motor operating efficiency. Simultaneously, this wiring design is compatible with stator windings of multiple branches, has high compatibility of hairpin coil wire types, reduces processing costs, and improves production efficiency.

[0070] like Figure 5As shown in Figures 9 and 12, in an embodiment of this application, the hairpin coil includes a U-shaped hairpin coil, which includes a first connecting segment, a first straight segment, a second straight segment, and two first bent segments. The first straight segment includes... Figure 5 The first straight segment in the middle is 1312. Figure 9 The third straight segment 1322 in the middle, Figure 12 The fifth straight segment is 1332. The second straight segment includes... Figure 5 The second straight line segment 1313 in the middle, Figure 9 The fourth straight segment 1323 in the middle, Figure 12 The sixth straight segment 1333. The first connecting segment includes Figure 5 The first link segment 1311 in the middle, Figure 9 The second connecting segment 1321 in the middle, Figure 12 The third connecting segment 1331, including the two first bending segments. Figure 5 The first bend in the middle is 1314. Figure 9 The second bend in the middle is 1324. Figure 12 The two third bends in the middle are 1334.

[0071] In some embodiments, such as Figure 5 As shown, the hairpin coil 13 includes multiple first flat wire conductors 131. The first straight segment and the second straight segment of each U-shaped hairpin coil in the outer space are located in the outer space. Therefore, each first flat wire conductor 131 is located in the outer space and belongs to the same-layer cross-wire structure. In the first embodiment of this application, each first flat wire conductor 131 includes a short-pitch hairpin coil. In this way, the inner space has only one type of span hairpin coil, specifically, all of which are short-pitch hairpin coils with a span of Q-1. The wire shape of the hairpin coil is relatively uniform, which facilitates the processing and manufacturing of the hairpin coil, reduces the difficulty of the wire insertion process in the stator slot 111, and improves the manufacturing efficiency of the stator assembly 100. Alternatively, each first flat wire conductor 131 may include a short-pitch hairpin coil and a full-pitch hairpin coil. In the second embodiment of this application, each first flat conductor 131 includes a long-pitch hairpin coil. In this configuration, the inner space contains only one type of hairpin coil with a span of Q+1. Specifically, all hairpin coils are long-pitch hairpin coils with a span of Q+1. The wire profile of the hairpin coils is relatively uniform, which facilitates the processing and manufacturing of the hairpin coils. This reduces the difficulty of the wire insertion process in the stator slot 111 and improves the manufacturing efficiency of the stator assembly 100. Alternatively, each first flat conductor 131 may include both a long-pitch hairpin coil and a full-pitch hairpin coil.

[0072] In some embodiments, such as Figure 5 and combined Figure 8As shown, the first flat conductor 131 includes a first connecting segment 1311, a first straight segment 1312, a second straight segment 1313, and two first bent segments 1314. One end of the first connecting segment 1311 is connected to the first straight segment 1312, and the other end of the first connecting segment 1311 is connected to the second straight segment 1313. The end of the first straight segment 1312 away from the first connecting segment 1311 is connected to one of the first bent segments 1314, and the end of the second straight segment 1313 away from the first connecting segment 1311 is connected to the other first bent segment 1314. The two first bent segments 1314 are arranged in parallel. Meanwhile, the first straight segment 1312 and the second straight segment 1313 are respectively inserted into two stator slots 111 and are both located in the outer space. The first connecting segment 1311 and the two first bent segments 1314 protrude from the two end faces of the stator core 11 along the axial direction.

[0073] In this embodiment, the first connecting segment 1311 is set at an angle, which is not equal to 0 degrees or 180 degrees. The first bent segment 1314 serves as the welding end of the first flat wire conductor 131. The first bent segment 1314 protrudes from the lower end of the stator core 11 to facilitate bending the first bent segment 1314 relative to the stator core 11. This allows the welding end of the first flat wire conductor 131 to be welded to the hairpin coil in the intermediate layer space at the end, reducing the manufacturing cost of the motor and improving the manufacturing efficiency of the motor.

[0074] In some embodiments, such as Figure 5 As shown, the first connecting segment 1311 includes a first inclined side 13111 and a second inclined side 13112. The first inclined side 13111 and the second inclined side 13112 are arranged at an angle. The end of the first inclined side 13111 away from the second inclined side 13112 is connected to the first straight segment 1312, and the end of the second inclined side 13112 away from the first inclined side 13111 is connected to the second straight segment 1313.

[0075] refer to Figure 5 As shown, the length of the first hypotenuse 13111 is defined as L1, and the length of the second hypotenuse 13112 is defined as L2, where L1 = L2. It is understood that the length of the first hypotenuse 13111 can also be greater than or less than the length of the second hypotenuse 13112; the specific length can be determined according to the actual situation, and this embodiment does not limit this.

[0076] Meanwhile, the angle between the first hypotenuse 13111 and the first line segment 1312 is defined as a, the angle between the second hypotenuse 13112 and the second line segment 1313 is defined as b, and the angle between the first hypotenuse 13111 and the second hypotenuse 13112 is defined as c, where both a and b are less than c.

[0077] In this embodiment, by setting the length of the first hypotenuse 13111 to be approximately equal to the length of the second hypotenuse 13112, and by setting the angular relationship between the included angle α and included angle β, the first straight line segment 1312, the first hypotenuse 13111, the second hypotenuse 13112, and the second straight line segment 1313 are arranged in a generally symmetrical manner, thereby facilitating the improvement of the forming accuracy and yield of the first flat wire conductor 131.

[0078] In some embodiments, such as Figure 5 As shown, a first convex bulge 1315 is provided between the first inclined side 13111 and the first straight segment 1312, and the first convex bulge 1315 protrudes towards the outer diameter of the stator core 11. Since the first convex bulge 1315 protrudes towards the outer diameter of the stator core 11, when the first flat wire conductor 131 is assembled onto the stator core 11, squeezing between two adjacent first connecting segments 1311 can be avoided, thereby improving the insulation reliability of the entire stator winding and extending the life of the motor.

[0079] In some embodiments, such as Figure 6 and combined Figure 7 As shown, the first convex hull 1315 includes a first arc segment 13151, a connecting segment 13152, and a second arc segment 13153 connected in sequence. The end of the first arc segment 13151 away from the connecting segment 13152 is connected to the first straight segment 1312, and the end of the second arc segment 13153 away from the connecting segment 13152 is connected to the first inclined side 13111.

[0080] In this embodiment, the connecting segment 13152 is a straight line segment. Both ends of the connecting segment 13152 are tangent to the first arc segment 13151 and the second arc segment 13153, respectively. The end of the first arc segment 13151 furthest from the connecting segment 13152 is tangent to the first straight line segment 1312, and the end of the second arc segment 13153 furthest from the connecting segment 13152 is tangent to the first hypotenuse 13111. This allows for a smooth, sequential transition between the first straight line segment 1312, the first arc segment 13151, the connecting segment 13152, the second arc segment 13153, and the first hypotenuse 13111.

[0081] In this embodiment, the first arc segment 13151 and the second arc segment 13153 have the same arc length. This facilitates the stamping and forming of the first convex bulge 1315 and improves its precision.

[0082] In some embodiments, the radius R of the first arc segment 13151 and the second arc segment 13153 is 1.5 to 2 times the narrow side dimension of the first flat conductor 131. This ensures that the stamping force of the die will not damage the outer insulation structure of the first flat conductor 131 and cause failure during the stamping process.

[0083] In some embodiments, such as Figure 6 As shown, the backward tilt angle p1 of the first convex hull 1315 is ≤ 60°, where the backward tilt angle p1 is the angle between the extension line of the connecting segment 13152 and the normal line of the first hypotenuse 13111 in the same projection plane. In this way, by controlling the range of the backward tilt angle, it is possible to ensure that the two adjacent hairpin coils in the outer space do not compress each other, and also to ensure that the hairpin coils themselves are not damaged. It also facilitates the manufacturing and processing of the mold and improves the forming accuracy of the first flat conductor 131.

[0084] In this embodiment, the backward tilt distance of the first convex hull 1315 is as follows: Figure 6 L3 in the design can be designed based on the spacing between the flat conductor layers and the line spacing.

[0085] In some embodiments, such as Figure 5 As shown, a third circular arc segment 1316 is provided between the second hypotenuse 13112 and the second straight line segment 1313. This facilitates a smooth transition between the second hypotenuse 13112 and the second straight line segment 1313.

[0086] In some embodiments, the radius of the third arc segment 1316 is 1.5 to 2 times the length of the long side of the first flat conductor 131. This ensures that the stamping force of the die will not damage the outer insulation structure of the first flat conductor 131 and cause failure during the stamping process; at the same time, it facilitates the manufacturing and processing of the die and improves the forming accuracy of the first flat conductor 131.

[0087] In some embodiments, the heights of the first straight segment 1312 and the second straight segment 1313 are greater than or equal to the height of the stator core 11. This ensures that when the flat conductor enters the stator core 11, the first convex 1315 and the third arc segment 1316 are located outside the stator core 11, preventing them from crushing the insulating paper on the core 11 and thus damaging the insulation structure.

[0088] In some embodiments, such as Figure 9As shown, the hairpin coil 13 also includes multiple second flat wire conductors 132. The third and fourth straight segments of the second flat wire conductors 132 in the inner space are located within the inner space. That is, each second flat wire conductor 132 is located in the inner space, belonging to the same-layer cross-wire structure. In the first embodiment, each second flat wire conductor 132 includes a short-pitch hairpin coil. In this method, the inner space has only one type of span hairpin coil, specifically, all are short-pitch hairpin coils with a span of Q-1. The wire shape of the hairpin coil is relatively uniform, which facilitates the processing and manufacturing of the hairpin coil, reduces the difficulty of the wire insertion process in the stator slot 111, and improves the manufacturing efficiency of the stator assembly 100. Alternatively, each second flat wire conductor 132 may include a short-pitch hairpin coil and a full-pitch hairpin coil. In the second embodiment, each second flat conductor 132 includes a long-pitch hairpin coil. In this embodiment, the inner space has only one type of hairpin coil with a span, specifically, all of them are long-pitch hairpin coils with a span of Q+1. The wire shape of the hairpin coil is relatively uniform, which facilitates the processing and manufacturing of the hairpin coil, reduces the difficulty of the wire insertion process in the stator slot 111, and improves the manufacturing efficiency of the stator assembly 100. Alternatively, each second flat conductor 132 may include a long-pitch hairpin coil and a full-pitch hairpin coil.

[0089] In some embodiments, reference Figure 9 and combined Figure 10 , Figure 11 As shown, the second flat conductor 132 includes a second connecting segment 1321, a third straight segment 1322, a fourth straight segment 1323, and two second bending segments 1324. One end of the second connecting segment 1321 is connected to the third straight segment 1322, and the other end of the second connecting segment 1321 is connected to the fourth straight segment 1323. The end of the third straight segment 1322 away from the second connecting segment 1321 is connected to one of the second bending segments 1324, and the end of the fourth straight segment 1323 away from the second connecting segment 1321 is connected to the other second bending segment 1324. The two second bending segments 1324 are arranged in parallel, and the bending direction of the second bending segment 1324 is opposite to that of the first bending segment 1314.

[0090] Similar to the U-shaped hairpin coil in the outer space, a second protrusion 1325 protruding towards the inner diameter of the stator core 11 is also provided between the second inclined side and the fourth straight segment 1323. The second protrusion 1325 also includes a first arc segment, a second arc segment, and a connecting segment. The arc radii of the first and second arc segments are both 1.5 to 2 times the narrow side dimension of the U-shaped hairpin coil. The second protrusion 1325 protrudes towards the inner diameter of the stator core 11; wherein, the third straight segment 1322 and the fourth straight segment 1323 are respectively inserted into the two stator slots 111 and are both located in the inner space, and the second connecting segment 1321 and the two fourth straight segments 1323 respectively protrude from the two end faces of the stator core 11 along the axial direction.

[0091] The backward tilt angle p2 of the second convex hull 1325 is ≤ 60°, where p2 is the angle between the extension of the connecting segment and the normal of the second hypotenuse in the same projection plane. In this way, by controlling the range of the backward tilt angle, it is possible to ensure that the two adjacent hairpin coils in the inner space do not compress each other, while also ensuring that the hairpin coils themselves are not damaged. It also facilitates the manufacturing and processing of the mold and improves the forming accuracy of the first flat conductor 131.

[0092] The structure of the second flat conductor 132 in this embodiment can refer to the structure of the first flat conductor 131, and the beneficial effects of the second flat conductor 132 can also refer to the beneficial effects of the first flat conductor 131, which will not be described in detail here.

[0093] In some embodiments, such as Figure 12 and combined Figure 13 As shown, the hairpin coil 13 also includes multiple third flat wire conductors 133, each of which is located in the intermediate layer space and is a full-pitch hairpin coil. Since the intermediate layer space is entirely composed of third flat wire conductors 133 and each of these conductors is a full-pitch hairpin coil, the wire profile of the hairpin coil is more uniform, which facilitates the processing and manufacturing of the hairpin coil, reduces the difficulty of the wire insertion process in the stator slot 111, and improves the manufacturing efficiency of the stator assembly 100.

[0094] In some embodiments, such as Figure 12As shown, the third flat conductor 133 includes a third connecting segment 1331, a fifth straight segment 1332, a sixth straight segment 1333, and two third bending segments 1334. One end of the third connecting segment 1331 is connected to the fifth straight segment 1332, and the other end of the third connecting segment 1331 is connected to the sixth straight segment 1333. The end of the fifth straight segment 1332 away from the third connecting segment 1331 is connected to one of the third bending segments 1334, and the end of the sixth straight segment 1333 away from the third connecting segment 1331 is connected to the other third bending segment 1334. The two third bending segments 1334 are symmetrically arranged. Furthermore, the fifth straight segment 1332 and the sixth straight segment 1333 are located between the two third bending segments 1334; wherein, the fifth straight segment 1332 and the sixth straight segment 1333 are respectively inserted into two stator slots 111, and the stator slots 111 are provided with multiple spaces for inserting conductors. The fifth straight segment 1332 and the sixth straight segment 1333 are located in two adjacent intermediate layers. Specifically, the fifth straight segment 1332 and the sixth straight segment 1333 occupy two spaces with a layer difference of 1; the third connecting segment 1331 and the two third bending segments 1334 respectively protrude from the two end faces of the stator core 11 along the axial direction. In this embodiment, when the fifth straight segment 1332 is located in the M-1 (M=8, 6, 4) layer in one of the stator slots 111, the sixth straight segment 1333 is located in the M-2 layer (7th, 5th, 3rd layer) in the other stator slot 111, which belongs to the heterogeneous layer cross-line structure, specifically the adjacent layer cross-line structure.

[0095] In one specific embodiment, the two first straight segments of two adjacent U-shaped hairpin coils are located in two adjacent stator slots, and the two adjacent second straight segments are also located in two adjacent stator slots. That is, the two adjacent fifth straight segments 1332 are located in two adjacent stator slots, and the two adjacent sixth straight segments 1332 are also located in two adjacent stator slots.

[0096] In this embodiment, the third connecting segment 1331 is set at an angle, which is not equal to 0 degrees or 180 degrees. The third bending segment 1334 serves as the welding end of the third flat conductor 133. The third bending segment 1334 protrudes from the lower end of the stator core 11 to facilitate bending the third bending segment 1334 relative to the stator core 11. This allows the welding end first bending segment 1314 on the first flat conductor 131, the welding end third bending segment 1334 on the third flat conductor 133, and the welding end second bending segment 1324 on the second flat conductor 132 to be bent, attached, and welded into the same spatial area, thereby achieving short-distance welding of the first flat conductor 131, the second flat conductor 132, and the third flat conductor 133.

[0097] In some embodiments, the third connecting segment 1331 has an isosceles triangular structure. This is beneficial for improving the forming accuracy of the third flat conductor 133.

[0098] In the above embodiments of this application, the inner and outer hairpin coils are in the same layer with the same span, while the middle layer uses the span of adjacent layers. This spanning method has good manufacturability and can also ensure fewer types of hairpin coils, which facilitates the manufacturing of hairpin coils and improves processing efficiency.

[0099] In some embodiments, such as Figure 14 As shown, the hairpin coil 13 also includes multiple fourth flat wire conductors 134 (Type I hairpin coil). The fourth flat wire conductor 134 includes a seventh straight segment 1341 and a fourth bent segment 1342 and a fifth bent segment 1343 connected to the two ends of the seventh straight segment 1341 respectively. The fourth bent segment 1342 and the fifth bent segment 1343 are located on the same side of the seventh straight segment 1341. The seventh straight segment 1341 is located in the outer space, and the fourth bent segment 1342 and the fifth bent segment 1343 protrude from the two end faces of the stator core 11 along the axial direction. The fifth bent segment 1343 is connected to the third flat wire conductor 133.

[0100] In this embodiment, reference Figure 14 As shown, the fourth bending segment 1342 and the fifth bending segment 1343 are both located to the left of the seventh straight segment 1341. In this embodiment, the seventh straight segment 1341 of the fourth flat conductor 134 is located in the outer space, and can be welded to the bending segment of the third flat conductor 133 through the fifth bending segment 1343 (that is, the welding end). The fourth bending segment 1342 extends out of the end face (that is, the crown end) of one end of the stator core 11.

[0101] In this embodiment, both the input and output ends of the stator winding are located in the outer space. This arrangement prevents interference between the fourth flat conductor (I-type hairpin coil) and the U-type hairpin coil, facilitating the insertion of the fourth flat conductor. It also allows for a larger busbar installation space and reduces the material usage of the busbar.

[0102] In some embodiments, such as Figure 15 As shown, a third protrusion 1344 is provided between the seventh straight segment 1341 and the fourth bent segment 1342. The third protrusion 1344 protrudes towards the outer diameter of the stator core 11, and its structure is the same as that of the first protrusion 1315 on the first flat conductor 131. The structure of the third protrusion 1344 in this embodiment can refer to the structure of the first protrusion 1315 described above, and will not be repeated here.

[0103] In some embodiments, such as Figure 16 and combined Figure 17The hairpin coil 13 also includes a fifth flat wire conductor 135, which includes an eighth straight segment 1351 and a sixth bent segment 1352 and a seventh bent segment 1353 connected to the two ends of the eighth straight segment 1351 respectively. The sixth bent segment 1352 and the seventh bent segment 1353 are located on the same side of the eighth straight segment 1351, and the bending direction of the sixth bent segment 1352 is opposite to that of the fourth bent segment 1342. The sixth bent segment 1352 and the seventh bent segment 1353 protrude from the two end faces of the iron core 11 along the axial direction respectively. The seventh bent segment 1353 is connected to the third flat wire conductor 133.

[0104] refer to Figure 16 As shown, in this embodiment, the sixth bend segment 1352 and the seventh bend segment 1353 are both located to the right of the eighth straight segment 1351. They are mainly used for welding the stator busbars, with the crown end twisted on the left and the welding end twisted on the right.

[0105] In the hairpin coils of the above embodiments, the bent sections of each flat wire conductor on the welding end side all cross the stator slot Q / 2. This arrangement results in a small crossing distance of the bent sections, saving conductor material, reducing copper loss, and improving motor performance.

[0106] In some embodiments, the two side walls of the stator slot 111 are arranged parallel to each other, which facilitates the insertion of the hairpin coil into the stator slot 111 and avoids the hairpin coil colliding with the inner wall of the stator slot 111 when it is inserted.

[0107] In some embodiments, such as Figure 20 As shown, the stator assembly also includes an insulating layer 15, which is disposed on the inner wall of the stator slot 111.

[0108] In this embodiment, the insulating layer 15 adopts an O-shaped structure, which can be a four-sided or six-sided structure. By setting the insulating layer 15, the hairpin coil and the slot wall of the stator slot 111 can be isolated, so that the hairpin coil and the iron core 11 are kept insulated.

[0109] In some embodiments, the stator assembly further includes two core pressure plates 14, which are correspondingly disposed on two end faces of the stator core 11 along the axial direction. Each core pressure plate 14 has an arc-shaped structure, and its inner arc wall has multiple opening slots. When the core pressure plate 14 is placed on the end face of the stator core 11, each opening slot corresponds to a stator slot 111. This allows for further definition of the position of the hairpin coil inserted into the stator slot 111, preventing the end of the hairpin coil from radially expanding outwards toward the core 11.

[0110] In some embodiments, the opening slots are arranged parallel to each other on the opposite side walls. In this way, after the core plate 14 is welded to the core 11, since the position of each opening slot corresponds to the position of each stator slot 111, and the opposite side walls of the opening slots are parallel, it is convenient to insert the insulating paper from the opening slots into the stator slots 111.

[0111] In some embodiments, the distance between the opposite side walls of the opening slot is greater than the distance between the opposite side walls of the stator slot 111. This effectively eliminates the problem of mismatch between the opening slot and the stator slot 111 caused by the shrinkage of the opening slot during welding of the core plate 14 to the core 11, thus solving the assembly accuracy problem and ensuring that the insulating paper is properly inserted into the stator slot 111 from the opening slot. Simultaneously, the core plate is suitable for motors with long stacks of silicon steel sheets in the stator core, preventing the core laminations from warping due to heat during silicon steel sheet welding.

[0112] like Figure 18-21 In the first embodiment of this application shown, the three sub-windings 121 in the stator assembly 100 are A, B and C. The three sub-windings are symmetrically currentted to generate a rotating magnetic field to realize the rotational motion of the motor. Each sub-winding is further divided into four branch windings. Each branch winding is composed of multiple flat wire conductors connected together. Specifically, each branch winding includes a short-pitch hairpin coil and a full-pitch hairpin coil.

[0113] In this embodiment, taking 72 stator slots Z and 8 rotor poles P as an example, each pole occupies 9 stator slots Q. That is, the full-pitch hairpin coil spans 9 stator slots, the short-pitch hairpin coil spans 8 stator slots, and the long-pitch hairpin coil spans 10 stator slots.

[0114] In the first embodiment, the inner layer space is provided with hairpin coils with a span of 8 and a span of 9, the outer layer space is provided with hairpin coils with a span of 8, and the middle layer is provided with hairpin coils with a span of 9.

[0115] refer to Figure 18 As shown, the connection method of the first branch winding in winding A is as follows:

[0116] A1_55_8—A1_64_7—A1_1_6—A1_10_5—A1_19_4—A1_28_3—A1_37_2—A1_46_1—A1_38_1—A1_29_2—A1_20_3—A1_11_4—A1_2_5—A1_65_6

[0117] —A1_56_7—A1_47_8—A1_39_8—A1_48_7—A1_57_6—A1_66_5—A1_3_4—A1_12_3—A1_21_2—A1_30_1—A1_ 21_1—A1_12_2—A1_3_3—A1_66_4—A1_57_5—A1_48_6—A1_39_7—A1_30_8—A1_38_8—A1_47_7—A1_56_6

[0118] —A1_65_5—A1_2_4—A1_11_3—A1_20_2—A1_29_1—A1_37_1—A1_28_2—A1_19_3—A1_10_4—A1_1_5—A1_64_6—A1_55_7—A1_46_8

[0119] refer to Figure 19 As shown, the connection method of the second branch winding in winding A is as follows:

[0120] A2_1_8—A2_10_7—A2_19_6—A2_28_5—A2_37_4—A2_46_3—A2_55_2—A2_64_1—A2_56_1—A2_47_2—A2_38_3—A2_29_4—A2_20_5—A2_11_6 —A2_2_7—A2_65_8—A2_57_8—A2_66_7—A2_3_6—A2_12_5—A2_21_4—A2_30_3—A2_39_2—A2_48_1—A2_39_1—A2_30_2—A2_21_3—A2_12_4

[0121] —A2_3_5—A2_66_6—A2_57_7—A2_48_8—A2_56_8—A2_65_7—A2_2_6—A2_11_5—A2_20_4—A2_29_3 —A2_38_2—A2_47_1—A2_55_1—A2_46_2—A2_37_3—A2_28_4—A2_19_5—A2_10_6—A2_1_7—A2_64_8

[0122] refer to Figure 20 As shown, the connection method of the third branch winding in winding A is as follows:

[0123] A3_19_8—A3_28_7—A3_37_6—A3_46_5—A3_55_4—A3_64_3—A3_1_2—A3_10_1—A3_2_1—A3_65_2—A3_56_3—A3_47_4—A3_38_5—A3_29_6

[0124] —A3_20_7—A3_11_8—A3_3_8—A3_12_7—A3_21_6—A3_30_5—A3_39_4—A3_48_3—A3_57_2—A3_66_1—A3_57_1—A3_48_2—A3_39_3—A3_30_4

[0125] —A3_21_5—A3_12_6—A3_3_7—A3_66_8—A3_2_8—A3_11_7—A3_20_6—A3_29_5—A3_38_4—A3_47_3 —A3_56_2—A3_65_1—A3_1_1—A3_64_2—A3_55_3—A3_46_4—A3_37_5—A3_28_6—A3_19_7—A3_10_8

[0126] refer to Figure 21 As shown, the connection method of the fourth branch winding in winding A is as follows:

[0127] A4_37_8—A4_46_7—A4_55_6—A4_64_5—A4_1_4—A4_10_3—A4_19_2—A4_28_1—A4_20_1—A4_11_2—A4_ 2_3—A4_65_4—A4_56_5—A4_47_6—A4_38_7—A4_29_8—A4_21_8—A4_30_7—A4_39_6—A4_48_5—A4_57_4

[0128] —A4_66_3—A4_3_2—A4_12_1—A4_3_1—A4_66_2—A4_57_3—A4_48_4—A4_39_5—A_30_6—A4_21_7—A4_12_8—A4_20_8—A4_29_7—A 4_38_6—A4_47_5—A4_56_4—A4_65_3—A4_2_2—A4_11_1—A4_19_1—A4_10_2—A4_1_3—A4__4—A4__5—A4_46_6—A4_37_7—A4_28_8

[0129] Similarly, the winding connection methods for sub-windings B and C can be obtained.

[0130] This application has four branches. Each set of windings can be connected to form a two-branch scheme by adding two full-pitch hairpin coils. For example, connecting A2_1_8 with A3_10_8 and A1_46_8 with A4_37_8 together constitutes a two-branch scheme, and its wiring diagram is as follows. Figure 22As shown; in the scheme of adding a full-pitch hairpin coil to each sub-winding of the two branches to connect them into a single branch, the wiring diagram is as follows. Figure 23 As shown.

[0131] In the two-branch embodiment, each branch also includes a short-pitch hairpin coil and a full-pitch hairpin coil. Specifically, each branch includes hairpin coils with a span of 8 and a span of 9. Specifically, the inner layer space is provided with hairpin coils with a span of 8 and a span of 9, the outer layer space is provided with hairpin coils with a span of 8 and a span of 10, and the middle layer is provided with a hairpin coil with a span of 9.

[0132] In a single-branch embodiment, the branch includes a short-pitch hairpin coil and a full-pitch hairpin coil. Specifically, each branch includes hairpin coils with spans of 8 and 9. Specifically, the inner layer has hairpin coils with spans of 8 and 9, the outer layer has hairpin coils with spans of 8 and 10, and the middle layer has a hairpin coil with a span of 9.

[0133] In the second embodiment of this application, the span of the outermost and innermost layers is 8 and 9, which is a combination of short span and full span. It can be slightly modified to a combination of 10 and 9, which is a combination of long span and full span. The performance is completely consistent with this embodiment, and it is an alternative solution.

[0134] Specifically, in the 4-branch scheme, each branch includes a hairpin coil with a span of 10 and a span of 9. Specifically, the inner space has hairpin coils with a span of 9 and a span of 10, the outer space has hairpin coils with a span of 10, and the middle layer has hairpin coils with a span of 9.

[0135] In the two-branch scheme, each branch includes a hairpin coil with a span of 9 and a span of 10. Specifically, the inner space has hairpin coils with a span of 9 and a span of 10, the outer space has hairpin coils with a span of 9 and a span of 10, and the middle layer has a hairpin coil with a span of 9.

[0136] In the 1-branch scheme, the branch includes hairpin coils with spans of 9 and 10. Specifically, the inner space has hairpin coils with spans of 9 and 10, the outer space has hairpin coils with spans of 9 and 10, and the middle layer has a hairpin coil with a span of 9.

[0137] In the above embodiments, the long-pitch hairpin coils all span Q+1 stator slots, and the short-pitch hairpin coils all span Q-1 stator slots, which minimizes the types of wires in each hairpin coil and improves the production efficiency of the flat wire motor.

[0138] Meanwhile, the wiring design of this invention can be compatible with stator windings of multiple branches, and the hairpin coil wire type has high compatibility, which reduces processing costs and improves production efficiency.

[0139] This application also provides an electric motor, including: a rotor 21 and a stator assembly 100 as described in any of the embodiments of this application, wherein the rotor 21 passes through the stator assembly.

[0140] The stator assembly 100 in this embodiment has the same structure as the above embodiments. Since the motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0141] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of this application's specification and drawings under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A stator assembly, characterized in that, The stator assembly is used in a motor with Z stator slots and P rotor poles, wherein each pole occupies Q of a stator slot, which is Z / P. The stator assembly includes: A stator core, wherein a plurality of stator slots are evenly arranged on the inner wall of the stator core, the side of the stator slot facing the center of the stator core is defined as the inner layer space, the side of the stator slot away from the center of the stator core is defined as the outer layer space, and the portion located between the inner layer space and the outer layer space is defined as the intermediate layer space. The stator winding includes multiple sub-windings connected in a star or delta configuration, each sub-winding including at least one branch winding, and each branch winding including multiple hairpin coils connected in series. The intermediate layer space is equipped with a full-pitch hairpin coil, the inner layer space is equipped with a short-pitch hairpin coil and a full-pitch hairpin coil, and the outer layer space is equipped with the stator winding of the short-pitch hairpin coil, or... The intermediate layer space is provided with a full-pitch hairpin coil, the inner layer space is provided with a long-pitch hairpin coil and a full-pitch hairpin coil, and the outer layer space is provided with a stator winding of the long-pitch hairpin coil.

2. The stator assembly according to claim 1, characterized in that, The long-pitch hairpin coil spans Q+1 stator slots, while the short-pitch hairpin coil spans Q-1 stator slots.

3. The stator assembly according to claim 1, characterized in that, The outer space contains a stator winding with a short-pitch hairpin coil, and the outer space also contains a full-pitch hairpin coil.

4. The stator assembly according to claim 1, characterized in that, The outer space contains a stator winding with a long-pitch hairpin coil, and the outer space also contains a full-pitch hairpin coil.

5. The stator assembly according to claim 1, characterized in that, The intermediate layer space is provided with a full-pitch hairpin coil, the inner layer space is provided with a short-pitch hairpin coil and a full-pitch hairpin coil, and the outer layer space is provided with a short-pitch hairpin coil in the stator winding. Each branch winding includes a short-pitch hairpin coil and a full-pitch hairpin coil.

6. The stator assembly according to claim 1, characterized in that, The intermediate layer space is provided with a full-pitch hairpin coil, the inner layer space is provided with a long-pitch hairpin coil and a full-pitch hairpin coil, and the outer layer space is provided with a long-pitch hairpin coil in the stator winding. Each branch winding includes a long-pitch hairpin coil and a full-pitch hairpin coil.

7. The stator assembly according to claim 1, characterized in that, The branch winding includes one branch winding, two branch windings, or four branch windings.

8. The stator assembly according to claim 1, characterized in that, The hairpin coil includes a U-shaped hairpin coil, which includes a first connecting segment, a first straight segment, a second straight segment, and two first bending segments.

9. The stator assembly according to claim 8, characterized in that, The first and second straight segments of each U-shaped hairpin coil in the inner space are located within the inner space, and / or the first and second straight segments of each U-shaped hairpin coil in the outer space are located within the outer space.

10. The stator assembly according to claim 8, characterized in that, The first and second straight segments of each of the U-shaped hairpin coils in the intermediate layer space are located in two adjacent intermediate layer spaces.

11. The stator assembly according to claim 10, characterized in that, The two first straight segments of the two adjacent U-shaped hairpin coils in the intermediate layer space are located in two adjacent stator slots, and the two adjacent second straight segments are also located in two adjacent stator slots.

12. The stator assembly according to claim 1, characterized in that, The hairpin coil includes a bent section extending to one side of the stator core end face, the bent section spanning a stator slot of Q / 2.

13. The stator assembly according to claim 1, characterized in that, The input and output terminals of the stator winding are located in the outer space.

14. The stator assembly according to claim 8, characterized in that, The first connecting segment includes a first inclined side and a second inclined side. A first bulge protruding towards the outer diameter of the stator core is provided between the first inclined side and the first straight segment of the U-shaped hairpin coil located in the outer space, and / or a second bulge protruding towards the inner diameter of the stator core is provided between the second inclined side and the second straight segment of the U-shaped hairpin coil located in the inner space. The first bulge and / or the second bulge both include a first arc segment, a second arc segment, and a connecting segment.

15. The stator assembly according to claim 14, characterized in that, The radius of the first arc segment and the second arc segment are both 1.5 to 2 times the narrow side dimension of the U-shaped hairpin coil.

16. The stator assembly according to claim 15, characterized in that, The backward tilt angle p1 of the first convex hull is ≤60°, and the backward tilt angle p1 is the angle between the extension line of the connecting segment and the normal line of the first hypotenuse in the same projection plane.

17. The stator assembly according to claim 15, characterized in that, The backward tilt angle p2 of the second convex hull is ≤60°, where p2 is the angle between the extension of the connecting segment and the normal of the second hypotenuse in the same projection plane.

18. The stator assembly according to claim 1, characterized in that, The inner space is provided with a first type I hairpin coil, and the first type I hairpin coil is provided with a third protrusion that protrudes towards the outer diameter of the stator core.

19. The stator assembly according to claim 18, characterized in that, The backward tilt angle of the third convex hull is ≤60°.

20. The stator assembly according to claim 1, characterized in that, The stator assembly also includes two core pressure plates, which are correspondingly disposed on two end faces of the stator core along the axial direction. The core pressure plate has an arc-shaped structure, and multiple opening slots are provided on the inner wall of the arc of the core pressure plate. When the core pressure plate is placed on the end face of the stator core, each opening slot corresponds to each stator slot.

21. The stator assembly according to claim 20, characterized in that, The opening groove is arranged parallel to each other on both sides.

22. The stator assembly according to claims 1-21, characterized in that, The number of stator slots Z is 72, and the number of rotor poles P is 8.

23. An electric motor, characterized in that, include: The rotor and the stator assembly as described in any one of claims 1 to 22, wherein the rotor passes through the stator assembly.

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