Motor, stator, and method for manufacturing a stator

Abstract

To provide a stator of a motor that can simplify the structure of a motor and improve the efficiency of assembly of the motor.SOLUTION: A stator of a motor includes a stator iron core 100 and a stator winding. On an end surface 110 along an axis direction of the stator iron core itself, a plurality of winding slots 120 formed through an internal wall and an external wall 112 of the stator iron core are provided. A coil unit 200a of the stator winding contains a plurality of first conductors to be assembled, each first conductor including at least one insertion part to be inserted into each winding slot. The coil units are connected and formed by being assembled to each other by the plurality of first conductors. Thus, when attaching the stator winding to the stator iron core, the plurality of first conductors are previously connected to each other to form the coil unit and then the whole coil unit can be installed to the stator iron core.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] [Cross - reference to Related Applications] This application claims the priority of an application with the title "Motor, Stator, and Method for Manufacturing Stator" proposed on September 20, 2022, and with an international application number of PCT / CN2022 / 120033.

[0002] This application relates to the field of power devices, specifically, to a motor, a stator, and a method for manufacturing a stator.

Background Art

[0003] The motor has become an important measure to promote the weight reduction of automobiles, increase the cruising range of electric vehicles, improve the space utilization rate of automobiles, and reduce the cost of the powertrain.

[0004] How to simplify the structure of the motor and improve the assembly efficiency of the motor is an important research direction in the field of motors.

Summary of the Invention

Problems to be Solved by the Invention

[0005] This application provides a motor, a stator, and a method for manufacturing a stator that can simplify the structure of the motor and improve the assembly efficiency of the motor.

Means for Solving the Problems

[0006] According to a first aspect, an embodiment of this application provides a stator of a motor including a stator core and a stator winding. On an end face along the axial direction of the stator core itself, a plurality of winding slots penetrating the inner wall and the outer wall of the stator core are provided, and the plurality of winding slots are installed at intervals along the circumferential direction of the stator core. The stator winding includes at least one coil unit, and the coil unit includes a plurality of first conductors to be assembled, and each first conductor includes at least one insertion part to be inserted into the winding slot.

[0007] In the above-described technology, since the coil unit is assembled and connected to each other by multiple first conductors, when attaching the stator winding to the stator core, the multiple first conductors can be connected to each other in advance to form the coil unit, and then the entire coil unit can be installed on the stator core. In this way, the wiring process is simplified, facilitating the realization of automated production, further simplifying the motor structure and assembly steps, and improving the motor assembly efficiency. The multiple first conductors of the coil unit are connected to form a distributed winding, thereby achieving high electromagnetic efficiency, reducing spatial harmonics, and improving NVH (Noise, Vibration, and Acoustic Roughness).

[0008] In some embodiments, at least two first conductors of the coil unit are distributed in a staggered manner along the circumferential direction. Each first conductor includes a plurality of insertions, each inserted into a different winding slot. The stator winding has at least two insertions arranged axially within each winding slot.

[0009] Each first conductor is provided with multiple insertion points, but these insertion points are connected, thus reducing the number of connection steps for the insertion points. The multiple insertion points of the first conductor are inserted into different winding slots, thereby improving the relative positional stability between the first conductor and the stator core. The offset fitting of at least two first conductors in the coil unit improves the relative positional stability between multiple first conductors in the coil unit.

[0010] In some embodiments, the coil unit has at least two insertion points stacked axially within each winding slot.

[0011] In some embodiments, the coil unit includes a plurality of conductive branches, each conductive branch includes a plurality of first conductors connected in series, and two adjacent first conductors of a conductive branch are connected to form a connection structure. All connection structures of the coil unit are installed on the outside of the outer wall.

[0012] By connecting the first conductor of the coil unit on the outside of the outer wall and canceling the connection on the inside of the inner wall of the first conductor of the coil unit, the process difficulty can be reduced and assembly efficiency can be improved.

[0013] In some embodiments, the first conductor further includes at least one connector, and adjacent insertions are connected via the connector. At least one connector is located on the inside of the inner wall.

[0014] By placing the connection points inside the stator core, the connection and assembly processes for multiple first conductors inside the stator core can be reduced, thereby lowering the overall process difficulty.

[0015] In some embodiments, at least one connection located on the inside of the inner wall is folded back axially, and two insertions connected to the folded connection are located in different layers.

[0016] By folding the connection portion, the axial distance of the insertion portion can be changed, and it is also possible to install at least two insertion portions on different winding layers, improving the problem of cramped space in the center of the stator core and reducing the risk of interference between different first conductors when the insertion portion spans layers and the risk of damage to the insulating coating of the first conductor.

[0017] In some embodiments, the maximum size of the connection is greater than the sum of the sizes of the two insertion points in the axial direction. The connection can be folded back by a relatively large amount in the axial direction to reduce stress concentration at the connection and lower the risk of connection failure.

[0018] In some embodiments, all connections located inside the inner wall are aligned along the circumferential direction, thereby making the coil unit arrangement more compact and reducing the risk of interference between connections. Alignment of the inside of the stator winding reduces the risk of damage to the insulating layer of the first conductor, improving the insulation reliability of the stator and extending the service life of the stator.

[0019] In some embodiments, a first pin and a second pin are provided at both ends of the first conductor. Of any two adjacent first conductors in a conductive branch, the first pin of one first conductor is connected to the second pin of the other first conductor to form a connection structure. The provision of the first and second pins facilitates the realization of a connection between the first conductors.

[0020] In some embodiments, of any two adjacent first conductors of a conductive branch, the first pin of one first conductor overlaps axially with the second pin of the other first conductor. The first and second pins are welded to each other in the overlapping region to form a connection structure.

[0021] By overlapping the first pin of one first conductor with the second pin of another first conductor along the axial direction, it is possible to facilitate welding between the two first conductors, improve the stability of the relative position of the first and second pins, and enhance the current-passing capability of the first and second pins.

[0022] In some embodiments, all connection structures of the coil unit are spaced apart along the circumferential direction. When there is a gap between adjacent connection structures and the first and second pins are welded to each other to form a connection structure, the welding distance can be increased, reducing mutual influence during welding. In addition, spacing out the connection structures reduces the risk of contact short circuits between the connection structures.

[0023] In some embodiments, the stator winding includes a plurality of coil units arranged in a stacked manner along the axial direction. Among two adjacent coil units, at least one connection structure of one coil unit is circumferentially displaced from another connection structure of the coil unit.

[0024] By spacing the connection structures of two adjacent coil units along the circumferential direction, the pitch between the connection structures of these two coil units can be increased. On the other hand, when the first pin and the second pin are welded to each other to form a connection structure, the welding distance can be increased and the mutual influence during welding can be reduced. In the embodiments of the present application, the electrical gap between the connection structures can be further increased, the requirements for the insulation of the connection structure part can be reduced, the complexity of the process can be reduced, raw materials can be saved, and the operation tact of the production line can be improved.

[0025] In some embodiments, the first pin and the second pin extend and are formed in a direction radially away from the center of the stator core, which facilitates gripping the first pin and the second pin during welding and is applicable to mass production.

[0026] In some embodiments, the first pin and the second pin that overlap each other extend and are formed in a direction close to each other along the circumferential direction, which simplifies the shape of the first conductor, reduces the size of the first conductor, reduces the height at which the coil unit is away from the end of the stator core, reduces the size of the outer envelope of the stator, reduces the weight of the first conductor, and facilitates the arrangement of the stator.

[0027] In some embodiments, the first conductor includes a conducting wire and an insulating layer coated outside the conducting wire. At one end of the insulating layer, a first opening is provided, and the conducting wire includes a first pin protruding from the first opening. The first opening has a first edge close to the outer wall and a second edge away from the outer wall. In the extending direction of the first pin, the distance between the first edge and the end of the first pin is less than or equal to the distance between the second edge and the end of the first pin.

[0028] When the first pin protrudes from the first opening, it is connected to other first conductors, facilitating the reduction of interference in the connection between the first pin and other first conductors by the insulating layer. According to the above technical solution, the portion close to the outer wall of the insulating layer has a relatively large length, and when another first conductor passes between the insulating layer and the outer wall, the insulation between the two first conductors can be improved.

[0029] In some embodiments, the angle formed between the plane where the first opening is located and a virtual plane is 0° to 30°. The virtual plane is perpendicular to the extending direction of the first pin and passes through the second edge.

[0030] By limiting the included angle α to 0° to 30°, the balance between the area of the insulating layer covering the conductor and the exposed size of the first pin can be achieved, the insulation performance can be improved, and the realization of the connection between the first pin and other structures can be facilitated.

[0031] In some embodiments, the first conductor further includes a first connection arm and a second connection arm. The first pin is connected to an insertion portion through the first connection arm, and the second pin is connected to another insertion portion through the second connection arm.

[0032] The position of the first pin can be adjusted by controlling the shape and size of the first connection arm, and the position of the second pin can be adjusted by controlling the shape and size of the second connection arm, so that the first pin and the second pin can be located at appropriate positions.

[0033] In some embodiments, the stator winding includes a plurality of coil units stacked along the axial direction. Among two adjacent coil units, the first connection arm and the second connection arm of at least one first conductor of one coil unit are folded back to the side away from another coil unit.

[0034] By folding back the first and second connecting arms of the first conductor, the pitch of the connection structure of the two coil units can be increased, reducing the insulation requirements of the connection structure, decreasing process complexity, and improving insulation reliability.

[0035] In some embodiments, the minimum pitch of the connection structure between two adjacent coil units in the axial direction is 1 mm or more.

[0036] The above proposed technology can increase the electrical gap of the stator, improve the insulation performance of the stator, enhance the reliability of the stator, and extend the service life of the stator.

[0037] In some embodiments, of two adjacent first conductors along the circumferential direction, the second connecting arm of one first conductor passes between the second pin of the other first conductor and the stator core. When the first and second pins are welded to each other, the impact of high welding temperatures on other parts of the first conductor can be reduced, and the welding operation for the first and second pins can be facilitated.

[0038] In some embodiments, the side of the second connecting arm away from the stator core is provided with a relief recess to accommodate a second pin of another first conductor.

[0039] By providing a relief recess in the second connecting arm, the position can be adjusted to accommodate the second pin, avoiding stacking of the second pin with other first conductors and the second connecting arm, thereby reducing the axial thickness of the coil unit. The relief recess also reduces the height of the stator winding ends, resulting in a relatively smaller outer envelope size for the stator, a smaller motor size, and easier motor placement.

[0040] Furthermore, by installing a relief recess, the interaction force due to positional interference between the second pin and the second connecting arm can be further improved, affecting the stability of the second pin's position and, in turn, the welding strength.

[0041] In some embodiments, the second connecting arm is bent at a position corresponding to the relief recess, forming a convex portion that protrudes toward the stator core.

[0042] By providing a protrusion relative to the relief recess, the second connecting arm can form the relief recess and protrusion through a bending process, simplifying the molding process of the second connecting arm.

[0043] In some embodiments, in order to simplify the winding structure of the first conductor, the span between two adjacent insertions of at least one first conductor is equal to the pole distance.

[0044] In some embodiments, the first conductor is a integrally molded structure such that the first conductor has a relatively high connection strength, and the service life of the first conductor can be improved.

[0045] In some embodiments, winding slots are provided on both of the two end faces of the stator core along its own axial direction, allowing the stator windings to be embedded on different sides of the stator core, and the same stator core can accommodate more coil units.

[0046] In some embodiments, the direction of extension of the winding slots is inclined with respect to the radial direction of the stator core. By employing inclined winding slots, electromagnetic noise suppression of the motor can be improved to some extent.

[0047] In some embodiments, the groove surface of the winding slot includes a bottom wall and two side walls connected to the bottom wall, the two side walls spaced apart along the circumferential direction, and the insertion portion is located between the two side walls. One end of the winding slot along the axial direction is provided with a groove opening that faces the bottom wall along the axial direction. The circumferential size of the groove opening is H1, and the circumferential pitch of the two side walls is H2, where H1 ≤ H2.

[0048] The above technical proposal can significantly reduce the reserved space and conductor gaps in pre-formed distributed winding assemblies, achieve a copper filling factor of over 75%, and make the wiring process more convenient and efficient by employing axial wire insertion.

[0049] In some embodiments, the winding slot includes a mounting groove that forms a recess in the side wall surface. The stator is inserted into the mounting groove and further includes a stopper member for restricting the axial movement of the insertion portion. By providing the mounting groove and the stopper member, the risk of the insertion portion detaching from the winding slot can be reduced.

[0050] According to a second aspect, an embodiment of the present application provides a motor including a stator according to any one embodiment of the first aspect.

[0051] According to a third aspect, the embodiments of this application provide a method for manufacturing a stator, which manufacturing method is A step of providing a stator core, wherein the end face of the stator core along its own axial direction is provided with a plurality of winding slots that penetrate the inner and outer walls of the stator core, and the plurality of winding slots are installed at intervals along the circumferential direction of the stator core, The process includes the step of inserting the insertion portion of each first conductor into a winding slot by press-fitting a coil unit, which is pre-assembled by a plurality of first conductors, into a plurality of winding slots in the axial direction.

[0052] In the above proposed technology, first, a stator core having winding slots is provided, then multiple first conductors are assembled into coil units, and the entire pre-assembled coil unit is then placed into the winding slots. This effectively improves the assembly efficiency of the stator compared to inserting multiple first conductors into the winding slots one by one.

[0053] In some embodiments, a coil unit pre-assembled by a plurality of first conductors is press-fitted axially into a plurality of winding slots, before the insertion portion of each first conductor is inserted into the winding slot. The steps include providing a linear conductor comprising a conductor and an insulating layer covering the outside of the conductor, The steps include removing the insulating layer from both ends of the conductor, The method further includes the step of bending a conductor to form a first conductor including a plurality of insertion portions that are spaced apart.

[0054] In the above proposed technology, the first conductor is formed by directly bending a straight conductor after the insulating layers at both ends have been removed. This eliminates the need for later processes such as conductor cutting, reducing the complexity of the conductor manufacturing process and improving the manufacturing efficiency of the stator.

[0055] In some embodiments, the number of poles of the stator is 2p, and the pole distance of the stator is n winding slots. Before the arrangement in which the insertion portion of each first conductor is inserted into the winding slot, the coil unit, which is pre-assembled by a plurality of first conductors, is press-fitted into the plurality of winding slots in the axial direction. The step of providing 2p·n first conductors, each first conductor comprising a first insertion portion and a second insertion portion, wherein the span between the first insertion portion and the second insertion portion is n winding slots, The step of pre-assembling multiple first conductors into a coil unit is: A step of providing an assembly mechanism including 2p × n slots, wherein the 2p × n slots are evenly arranged along the circumferential direction of the assembly mechanism, The steps include stacking (2p-1) × n first conductors sequentially in 2p × n slots that are opened along a counterclockwise direction, The steps include inserting the remaining n first conductors into slots of an assembly mechanism to form a coil unit, wherein in any one slot, the first insertion portion of one first conductor of the coil unit is located on the side closer to the bottom wall of the slot than the second insertion portion of another first conductor of the coil unit.

[0056] In the above solution, multiple first conductors can be interlocked and act as stoppers by their arrangement, thereby improving the stability of the relative positions between multiple first conductors within the coil unit.

[0057] In some embodiments, a coil unit pre-assembled by a plurality of first conductors is press-fitted axially into a plurality of winding slots, before the insertion portion of each first conductor is inserted into the winding slot. A step of providing m × j first conductors, each first conductor being continuously bent and including 2 × k insertion parts, where m, j, and k are all positive integers. The steps include: arranging m first conductors to create a subcoil unit, and manufacturing j subcoil units; The process further includes the step of assembling j sub-coil units to form a coil unit.

[0058] In the above method, by assembling multiple first conductors in stages, the difficulty of assembly can be reduced and assembly efficiency can be improved. [Brief explanation of the drawing]

[0059] To more clearly illustrate the technical concept of the embodiments of this application, the following is a brief introduction to the drawings that may be used in the embodiments of this application. It is obvious that the drawings described below represent only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without expending any creative effort. [Figure 1] This is a schematic diagram of one structure of a stator according to several embodiments of this application. [Figure 2] This is a schematic diagram of one explosion of a stator according to several embodiments of this application. [Figure 3] This is an enlarged schematic diagram of the circular frame in Figure 2. [Figure 4] This is a schematic diagram of the stator core of a stator according to several embodiments of this application. [Figure 5] This is a schematic diagram of the structure of the first conductor of the stator winding of a stator according to some embodiments of this application. [Figure 6] This is a schematic diagram of the structure of the stator core and first conductor of a stator according to some embodiments of this application. [Figure 7] This is a schematic local cross-sectional view of one of the stators according to several embodiments of this application. [Figure 8] This is another local cross-sectional schematic diagram of a stator according to some embodiments of this application. [Figure 9] This is a local schematic diagram of a stator according to several embodiments of this application. [Figure 10] This is a schematic diagram of the local structure of the first conductor of a stator according to some embodiments of this application. [Figure 11] This is a schematic local cross-sectional view of one of the stators according to several embodiments of this application. [Figure 12] This is a schematic local cross-sectional view of one stator according to several other embodiments of this application. [Figure 13] This is a schematic diagram of the structure of a motor stator according to some other embodiments of this application. [Figure 14] Figure 13 is a schematic diagram of the coil unit's structure. [Figure 15] This is a schematic diagram of the structure of the first conductor of a stator according to some embodiments of this application. [Figure 16] Figure 13 is a schematic diagram of the stator assembly process. [Figure 17] Figure 13 is another schematic diagram of the stator assembly process. [Figure 18] This is a schematic diagram of the stator from a different perspective, according to some embodiments of this application. [Figure 19]This is a schematic diagram of the stator from another perspective, according to some embodiments of this application. [Figure 20] Figure 19 is a schematic diagram of the localized structure at A. [Figure 21] This is a schematic diagram of the structure of a part of the first conductor of a stator according to some embodiments of this application. [Figure 22] This is a schematic diagram of the structure of a portion of the first conductor of a stator according to some other embodiments of this application. [Figure 23] This is a schematic diagram of the structure of a part of the first conductor of a stator according to some other embodiments of this application. [Figure 24] This is a schematic diagram of the structure of a part of the first conductor of a stator according to some further embodiments of the present application. [Figure 25] This is a schematic diagram of the local structure of a stator coil unit according to several embodiments of this application. [Figure 26] This is a schematic diagram of the structure of two first conductors of a stator according to some other embodiments of this application. [Figure 27] Figure 26 is a schematic diagram of the structure from a different perspective. [Figure 28] Figure 26 is a schematic diagram of a part of the structure of the first conductor of the stator. [Figure 29] This is a schematic diagram of the structure of two first conductors of a stator according to some other embodiments of this application. [Figure 30] Figure 29 is a schematic diagram of the structure from a different perspective. [Figure 31] Figure 29 is a schematic diagram of the structure of a part of the first conductor of the stator. [Figure 32] This is a schematic diagram of the structure of the second conductor of the stator according to some embodiments of this application. [Figure 33] This is a schematic diagram of the structure of another first conductor of the stator according to some embodiments of this application. [Figure 34] Figure 33 is a schematic diagram of the structure of the stator including the first conductor. [Figure 35] This is a schematic diagram of the stator core of a stator according to some other embodiments of this application. [Figure 36] This is a schematic diagram of a stator according to some other embodiments of this application. [Figure 37] Figure 36 is a side view of the stator. [Figure 38] This is a local cross-sectional view of the stator core of a stator according to several embodiments of this application. [Figure 39] This is a local cross-sectional view of the stator core of a stator according to some other embodiments of this application. [Figure 40] This is a flowchart showing a method for manufacturing a stator according to some embodiments of this application. [Figure 41] These are different schematic diagrams of the manufacturing process of a stator according to several other embodiments of this application. [Figure 42] These are different schematic diagrams of the manufacturing process of a stator according to several other embodiments of this application. [Figure 43] These are different schematic diagrams of the manufacturing process of a stator according to several other embodiments of this application. [Figure 44] These are different schematic diagrams of the manufacturing process of a stator according to several other embodiments of this application. [Figure 45] These are different schematic diagrams of the manufacturing process of a stator according to several other embodiments of this application. [Figure 46] These are different schematic diagrams of the manufacturing process of a stator according to several other embodiments of this application. The drawings are not depicted to actual scale. [Modes for carrying out the invention]

[0060] To clarify the purpose, technical proposal, and advantages of the embodiments of this application, the following clearly describes the technical proposal in the embodiments of this application, linking it with the drawings of the embodiments. Clearly, the embodiments described are only some, not all, embodiments of this application. All other embodiments derived from the embodiments of this application without the creative effort of a person skilled in the art are all within the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as that commonly understood by those skilled in the art relating to this application. In this application, terms used in the specification are solely for the purpose of describing specific embodiments and are not intended to limit this application. The terms “includes” and “have,” and any variations thereof, in the description of the specification, claims, and drawings of this application are intended to intentionally cover the non-exclusive “includes.” Terms such as “first,” “second,” etc., in the specification, claims, or drawings of this application are not intended to describe a particular order or hierarchical relationship, but to distinguish different subjects.

[0062] The “Examples” as used in this application mean that certain features, structures, or characteristics described in conjunction with the Examples may be included in at least one Example of this application. The occurrence of this phrase in each location in the specification does not necessarily refer to the same Example, nor does it mean that each Example is mutually exclusive or alternative to the others.

[0063] In the description of this application, unless otherwise specifically defined or limited, the terms “attachment,” “connection,” “connection,” and “installation” should be understood in a broad sense. For example, a fixed connection may be a detachable connection, an integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. A person skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0064] In this application, the terms "and / or" merely describe the relationship between related objects, indicating that three relationships are possible. For example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. In this application, the character " / " generally indicates that the preceding and succeeding related objects are in an "or" relationship.

[0065] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the dimensions such as thickness, length, and width of various components in the embodiments of this application shown in the drawings, and the overall dimensions such as thickness, length, and width of the integrated device, are for illustrative purposes only and should not constitute any limitation to this application.

[0066] The term "multiple" as it appears in this application refers to two or more (including two).

[0067] Currently, in the drive motors of new energy vehicles, the inventors have noticed that many conventional designs for the electrode stators employ a centralized stator winding and a slanted groove design to reduce tooth groove torque. However, they have noticed that the slanted grooves make the motor stator core production and wiring process very complex, resulting in a complex structure and wiring process compared to conventional stators, low assembly efficiency, and difficulty in achieving mass production and automated manufacturing.

[0068] Therefore, the embodiments of this application provide a motor, a stator, and a method for manufacturing a stator that simplify the structure of the stator by adjusting the wiring and winding method of the conductive material, thereby improving the assembly efficiency of the motor.

[0069] For the sake of understanding, the following interpretation and explanation will be given to the technical terms appearing in this application.

[0070] Stator: In a motor, this is the stationary, immobile part, and its function is to generate a rotating magnetic field.

[0071] Rotor: A rotating component in a motor, whose function is to convert electrical energy into mechanical energy.

[0072] Span: This is the distance that the sides of two identical elements in a motor winding cross over the armature surface, and is generally expressed by the number of winding slots drilled into the stator core.

[0073] Pole Pairs P: The number of pole pairs is abbreviated as the pole pair number. The magnetic poles formed after the motor windings are energized appear in pairs of north and south poles. The total number of magnetic poles is 2P.

[0074] Pole distance: Pole distance is the distance that each magnetic pole of the motor occupies along the circumferential surface of the air gap. Pole distance may also be expressed in terms of the number of winding slots in the stator core. Exemplary example, pole distance is Z / 2P, where Z is the total number of winding slots in the stator core.

[0075] Pole Phase Group: In an AC motor, when multiple conductors belonging to the same phase winding are connected in series under a single pole distance, they form a group called a pole phase group, also known as a coil unit. The current direction and electromagnetic action of each conductor within the pole phase group are all the same, and these conductors jointly generate magnetic poles in that phase winding.

[0076] Phase winding: A phase winding is a set of windings connected in series or parallel from one or more parallel branched connections using a predetermined connection method.

[0077] Figure 1 is a schematic diagram of one structure of a stator according to several embodiments of the present application; Figure 2 is a schematic diagram of one explosion of a stator according to several embodiments of the present application; Figure 3 is an enlarged schematic diagram of the circular frame in Figure 2; Figure 4 is a schematic diagram of the stator core of a stator according to several embodiments of the present application; Figure 5 is a schematic diagram of the structure of the first conductor of the stator winding of a stator according to several embodiments of the present application; Figure 6 is a schematic diagram of the structure of the stator core and the first conductor of a stator according to several embodiments of the present application; Figure 7 is a schematic diagram of one local cross-section of a stator according to several embodiments of the present application; and Figure 8 is a schematic diagram of another local cross-section of a stator according to several embodiments of the present application.

[0078] As shown in Figures 1 to 8, some embodiments of the present application provide a stator including a stator core 100 and stator windings 200. A plurality of winding slots 120 are provided on an end face 110 of the stator core 100 along its own axial direction D, penetrating the inner wall 111 and outer wall 112 of the stator core 100, and the plurality of winding slots 120 are spaced apart along the circumferential direction of the stator core 100. The stator windings 200 include at least one coil unit 200a, the coil unit 200a includes a plurality of first conductors 210 to be assembled, each first conductor 210 including at least one insertion portion 2011 to be inserted into a winding slot 120.

[0079] The stator core 100 has two opposing end faces 110 along the axial direction D. In the embodiment of this application, winding slots 120 can be installed on only one end face 110, or winding slots 120 can be installed on both end faces 110 simultaneously.

[0080] The stator core 100 has an inner wall 111 and an outer wall 112, and both ends of the winding slot 120 form openings in the inner wall 111 and the outer wall 112, respectively. The inner wall 111 and the outer wall 112 are the wall surfaces of the stator core 100, and selectively, both the inner wall 111 and the outer wall 112 are cylindrical surfaces. The two end faces 110 are connected to the inner wall 111 and the outer wall 112.

[0081] For example, the winding slot 120 penetrates the stator core 100 radially. It should be understood that penetrating radially means that both ends of the winding slot 120 extend into the inner wall 111 and the outer wall 112, and it is not required that the direction of extension of the winding slot 120 be parallel to the radial direction.

[0082] The direction of extension of the winding slot 120 may be set as needed. In some examples, the winding slot may be a straight groove extending along the radial direction of the stator core 100, and in some other alternative examples, the winding slot may be an inclined groove extending along a direction that makes a certain angle with respect to the radial direction.

[0083] Multiple winding slots 120 may be installed at equal intervals or at unequal intervals in the circumferential direction of the stator core 100.

[0084] The multiple first conductors 210 of the coil unit 200a may be assembled by bundling, lamination, or other processes. Exemplarily, the first conductors 210 may be fixedly connected to each other, or their own structure may provide a stopper between them.

[0085] The embodiments of this application do not limit the number of insertion portions 2011 of the first conductor 210. The number of insertion portions 2011 of multiple first conductors 210 may be the same or different. In some examples, the number of insertion portions 2011 of all first conductors 210 may be the same, for example, one, two, four, eight or more insertion portions 2011 of each first conductor 210. In some other examples, the number of insertion portions 2011 of some first conductors 210 may be different from the number of insertion portions 2011 of other first conductors 210, for example, some first conductors 210 may include one insertion portion 2011, some first conductors 210 may include two insertion portions 2011, and some first conductors 210 may include three or more insertion portions 2011.

[0086] The number of coil units 200a may be one or more. For example, there may be multiple coil units 200a, and multiple coil units 200a may be stacked along the axial direction D of the stator core 100.

[0087] Each first conductor 210 may include one or more insertion portions 2011. The insertion portions 2011 are effective edges of the first conductor 210, incorporated into the stator core 100, and play a role in electromagnetic pole energy conversion.

[0088] There are several types of installation for the first conductor 210. The first conductor 210 may be a flat wire or a round wire. The cross-section of the flat wire may be rectangular, and the cross-section of the round wire may be circular. In the embodiments of this application, a flat wire is used as an example for illustrative purposes. In other embodiments, the first conductor 210 may be a round wire.

[0089] Selectively, the coil unit 200a is placed in the winding slot 120 along the axial direction D, and the wiring process is made convenient and efficient by wiring the coil unit 200a along the axial direction D.

[0090] In the above proposed technology, the stator includes a stator core 100 and stator windings 200, and the coil units 200a of the stator windings 200 are embedded in the winding slots 120 of the stator core 100. Since the coil units 200a are assembled and connected together by a plurality of first conductors 210, when attaching the stator windings 200 to the stator core 100, the plurality of first conductors 210 can be connected together in advance to form the coil units 200a, and then the entire coil units 200a can be installed on the stator core 100. In this way, the wiring process is simplified, facilitating the realization of automated production, further simplifying the structure and assembly steps of the motor, and improving the assembly efficiency of the motor. The plurality of first conductors 210 of the coil units 200a are connected to form a distributed winding, thereby achieving high electromagnetic efficiency, reducing spatial harmonics, and improving NVH (Noise, Vibration, and Acoustic Roughness).

[0091] In some embodiments, the direction of extension of the winding slot 120 is inclined with respect to the radial direction of the stator core 100. In this application, by employing inclined winding slots, the suppression of electromagnetic noise in the motor can be improved to some extent.

[0092] In some other embodiments, the direction of extension of the winding slots 120 may be parallel to the radial direction of the stator core 100, thus improving the convenience of manufacturing the stator core 100 and the reliability of subsequent processes.

[0093] In some embodiments, at least two first conductors 210 of the coil unit 200a are distributed in a staggered manner along the circumferential direction. Each first conductor 210 includes a plurality of insertion portions 2011, each inserted into a different winding slot 120. The stator winding 200 has at least two insertion portions 2011 stacked along the axial direction D within each winding slot 120.

[0094] The two first conductors 210 are said to be offset along the circumferential direction to mean that the two first conductors 210 do not completely overlap along the axial direction and are offset along the circumferential direction. For example, two adjacent first conductors 210 of a coil unit 200a offset one winding slot 120 along the circumferential direction.

[0095] Each first conductor 210 is provided with multiple insertion parts 2011, but since the multiple insertion parts 2011 of the first conductor 210 are connected, the number of connection steps for the insertion parts 2011 can be reduced. The multiple insertion parts 2011 of the first conductor 210 are inserted into different winding slots 120, thereby improving the relative positional stability between the first conductor 210 and the stator core 100. By offsetting the fitting of at least two first conductors 210 of the coil unit 200a, the relative positional stability between the multiple first conductors 210 in the coil unit 200a can be improved.

[0096] Therefore, the embodiment of this application can not only simplify the structure of the motor and improve the assembly efficiency of the motor, but also improve the stability of the relative positions between each component in the stator and extend the service life of the stator.

[0097] In some embodiments, the coil unit 200a has at least two insertion portions 2011 stacked along the axial direction D within each winding slot 120. The coil unit 200a is organized into at least two layers.

[0098] In some embodiments, the multiple first conductors 210 of the coil unit 200a are distributed in a staggered manner along the circumferential direction. A staggered distribution of the multiple first conductors 210 along the circumferential direction means that no two of the first conductors 210 completely overlap along the axial direction, and are staggered along the circumferential direction.

[0099] In some embodiments, in each winding slot 120, multiple insertion portions 2011 are stacked along the axial direction D. Embodiments of this application allow for the selection of different winding layer numbers depending on the electromagnetic performance requirements, and by rationally selecting the number of winding layer numbers, the skin effect of the AC winding can be effectively suppressed and the temperature rise of the motor can be reduced. Exemplarily, four insertion portions 2011 are stacked in each winding slot 120.

[0100] In some embodiments, the coil unit 200a includes a plurality of conductive branches 201, each containing a plurality of first conductors 210 connected in series. Two adjacent first conductors 210 of a conductive branch 201 are connected to form a connecting structure 2145. All of the connecting structures 2145 of the coil unit 200a are installed on the outside of the outer wall 112.

[0101] The outside of the exterior wall 112 refers to the side of the exterior wall 112 that is away from the center of the stator core 100.

[0102] For example, multiple first conductors 210 of the conductive branch 201 are in the same phase.

[0103] The two first conductors 210 may be connected by welding, bonding, locking or other means to form a connecting structure 2145. Optionally, two adjacent first conductors 210 of the conductive branch 201 are welded, and the connecting structure 2145 includes weld spots formed by welding.

[0104] In the embodiments of this application, the first conductor 210 of the coil unit 200a is connected on the outside of the outer wall 112, and by eliminating the connection on the inside of the inner wall 111 of the first conductor 210 of the coil unit 200a, the process difficulty can be reduced and assembly efficiency can be improved.

[0105] In some embodiments, the first conductor 210 further includes at least one connector 213, and adjacent insertions 2011 are connected via the connector 213. At least one connector 213 is located inside the inner wall 111.

[0106] The number of connection points 213 is related to the number of insertion points 2011. For example, if the first conductor 210 contains Y insertion points 2011, the number of connection points 213 may be Y-1, where Y is a positive integer greater than 1.

[0107] Selectively, the connector 213 and the insertion part 2011 are connected as a single unit.

[0108] By installing the connection portion 213 inside the stator core 100, the connection and assembly process of the multiple first conductors 210 inside the stator core 100 can be reduced, thereby lowering the complexity of the process.

[0109] In some embodiments, the number of insertion portions 2011 of the first conductor 210 is even.

[0110] In some embodiments, at least one connecting portion 213 located inside the inner wall 111 is folded back axially, so that two insertion portions 2011 connected to the folded connecting portion 213 are in different layers.

[0111] Exemplary, in the winding slot 120, the multiple insertion parts 2011 are stacked along the axial direction D. Along the direction away from the bottom wall surface 121 of the winding slot 120, the multiple insertion parts 2011 in the winding slot 120 are each in a different layer, and exemplary, along the direction away from the bottom wall surface 121 of the winding slot 120, the R insertion parts 2011 in the winding slot 120 are each located in the first layer, the second layer, ..., the Rth layer, where R is a positive integer greater than 1.

[0112] When we say that the two insertion parts 2011 connected to the folded connection part 213 are on different layers, it means that the number of layers in the corresponding winding slot 120 for these two insertion parts 2011 is different. For example, one insertion part 2011 connected to the connection part 213 is located in the first layer of the winding slot 120, and the other insertion part 2011 connected to the connection part 213 is located in the second layer of the winding slot 120.

[0113] The degree to which the connecting portion 213 is folded may be set based on the space inside the inner wall.

[0114] By folding back the connecting portion 213, the axial distance D of the insertion portion 2011 can be changed, and it is also possible to install at least two insertion portions 2011 on different winding layers, thereby improving the problem of cramped space in the center of the stator core 100, and reducing the risk of interference between different first conductors 210 when the insertion portion 2011 crosses layers, as well as the risk of damage to the insulating coating of the first conductor 210.

[0115] In some other embodiments, the two insertion portions 2011 connected to the folded-back connector portion 213 may be located on the same layer.

[0116] In some embodiments, the difference in the number of layers in which two adjacent insertion portions 2011 of the same first conductor 210 are located is 1 or less. For example, if one insertion portion 2011 of the first conductor 210 is located in the first layer within the winding slot 120, another insertion portion 2011 of the first conductor 210 adjacent to this insertion portion 2011 may be located in the first layer or in the second layer. Embodiments of this application can simplify the design across winding layers.

[0117] In some embodiments, the connecting portion 213 located on the inside of the inner wall 111 is folded back in the axial direction.

[0118] In some embodiments, the insertion portion 2011 of the first conductor 210 is at least four, and at least one connection portion 213 is located on the outside of the outer wall 112.

[0119] In some embodiments, the two insertion portions 2011 connected to the outer connection portion 213 of the outer wall 112 may be located on the same layer or on different layers.

[0120] In some embodiments, the maximum size of the connection portion 213 in the axial direction D is greater than the sum of the sizes of the two insertion portions 2011.

[0121] The connecting portion 213 is folded back by a relatively large amount in the axial direction D, thereby reducing stress concentration in the connecting portion 213 and lowering the risk of damage to the connecting portion 213.

[0122] As shown in Figure 7, the connecting portion 213 adopts an everted form and has a relatively large arc during the fold, thereby reducing bending stress and lowering the risk of breakage.

[0123] In some embodiments, the connecting portion 213 includes a plurality of bent portions 213c. The connecting portion 213 forms an everted structure through multiple bends, thus reducing the degree of each individual bend and lowering the risk of breakage.

[0124] In some embodiments, all connection parts 213 located inside the inner wall 111 are arranged in a circumferential direction, thereby making the arrangement of the coil unit 200a more compact and reducing the risk of interference between connection parts 213. Alignment of the inside of the stator winding reduces the risk of damage to the insulating layer of the first conductor 210, improving the insulation reliability of the stator and extending the service life of the stator.

[0125] In some embodiments, the first conductor 210 has an integrally molded structure such that it has a relatively high connection strength, and the service life of the first conductor 210 can be improved.

[0126] The selectively molded connector 213 and insertion portion 2011 may be formed by deformation from the conductor. For example, if the first conductor 210 is a rectangular wire, the first conductor 210 may be mold-formed after varnish removal and punching by a rectangular conductor. The wound rectangular conductor is leveled and then laser-devarified at corresponding length positions, and after varnish removal is complete, it is precisely punched. The punched rectangular conductor is then assembled into the winding slot 120 after forming the first conductor 210 through mold 3D molding and one-time 3D press molding. Because the punching, varnish removal, and 3D molding processes of the first conductor 210 by 3D molding are easily controllable, there is no need to cut the conductor, reducing process complexity and improving the operational efficiency of the production line.

[0127] Figure 9 is a local schematic diagram of a stator according to several embodiments of the present application, Figure 10 is a local schematic diagram of the local structure of the first conductor of the stator according to several embodiments of the present application, Figure 11 is a local cross-sectional schematic diagram of one of the stator according to several embodiments of the present application, and Figure 12 is a local cross-sectional schematic diagram of one of the stator according to another embodiment of the present application.

[0128] Referring to Figures 2 to 5 and Figures 9 to 12, in some embodiments, a first pin 214 and a second pin 215 are provided at both ends of the first conductor 210. Of any two adjacent first conductors 210 of the conductive branch 201, the first pin 214 of one first conductor 210 is connected to the second pin 215 of the other first conductor 210 to form a connection structure 2145.

[0129] By providing the first pin 214 and the second pin 215, the connection between the first conductors 210 is facilitated.

[0130] In some embodiments, of any two adjacent first conductors 210 of the conductive branch 201, the first pin 214 of one first conductor 210 and the second pin 215 of the other first conductor 210 overlap along the axial direction D. The first pin 214 and the second pin 215 are welded to each other in the overlapping region to form a connecting structure 2145.

[0131] Exemplary, the connection structure 2145 includes an overlapping region between the first pin 214 and the second pin 215, and a weld spot formed by welding.

[0132] For example, the first pin 214 and the second pin 215 are welded by TIG (non-fusible electrode gas shielded arc welding), laser welding, or by other means.

[0133] By overlapping the first pin 214 of one first conductor 210 with the second pin 215 of another first conductor 210 along the axial direction D, it is possible to facilitate welding between the two first conductors 210, improve the relative positional stability of the first pin 214 and the second pin 215, and enhance the current-passing capability of the first pin 214 and the second pin 215.

[0134] In some embodiments, automatic welding identification can be achieved during welding by rotating the stator axially or by rotating the welding head, and welding can be performed as single-point or simultaneous welding of multiple points, resulting in high production efficiency. The positional accuracy of the weld portion of the pre-formed coil unit 200a is good, and the first conductor 210 is in a natural state during welding, with relatively small springback and internal stress, reducing the risk of cracking.

[0135] In some embodiments, all connection structures 2145 of the coil unit 200a are installed spaced apart along the circumferential direction. When there is a gap between adjacent connection structures 2145 and the first pin 214 and the second pin 215 are welded to each other to form the connection structure 2145, the welding distance can be increased and mutual influence during welding can be reduced. In addition, by installing the connection structures 2145 spaced apart, the risk of contact short circuits between the connection structures 2145 can be reduced.

[0136] In some embodiments, the stator winding 200 includes a plurality of coil units 200a arranged in a stack along the axial direction D.

[0137] Of two adjacent coil units 200a, at least one connection structure 2145 of one coil unit 200a and the connection structure 2145 of the other coil unit 200a are offset in the circumferential direction. In other words, at least one connection structure 2145 of one coil unit 200a does not overlap with the connection structure 2145 of the other coil unit 200a in the axial direction D.

[0138] The connecting structures 2145 between two adjacent coil units 200a can be spaced apart along the circumferential direction, increasing the pitch between these two connecting structures 2145. Alternatively, if the first pin 214 and the second pin 215 are welded to each other to form the connecting structure 2145, the welding distance can be increased, reducing mutual influence during welding. Embodiments of this application can further increase the electrical gap between the connecting structures 2145, reduce the requirement for insulation in the connecting structures 2145, reduce process complexity, save raw materials, and improve the operating cycle time of the production line.

[0139] In some embodiments, when a coil unit 200a is inserted into a winding slot 120, the distance between the connecting structures 2145 between different coil units 200a is relatively large, so it is not necessary to continue performing flare deformation on the first pin 214 and the second pin 215 within the connecting structure 2145, thereby reducing the complexity of the process, further ensuring the stability of the positions of the first pin 214 and the second pin 215 without requiring flare deformation, and reducing the risk of welding cracks.

[0140] Furthermore, the embodiments of this application can further reduce the stator axial size, making the motor axial size smaller and lighter. In the finished vehicle, this reduces the unsprung mass, and the multi-link suspension structure and dummy spring configuration contribute to improved chassis operability.

[0141] In some embodiments, the multiple connection structures 2145 of each coil unit 200a are selectively distributed evenly along the circumferential direction.

[0142] In some embodiments, the first conductor 210 includes a conductor 2101 and an insulating layer 2102 covering the outside of the conductor 2101. A first opening 2103 is provided at one end of the insulating layer 2102, and the conductor 2101 includes a first pin 214 protruding from the first opening 2103. The first opening 2103 has a first edge 2104 closer to the outer wall 112 and a second edge 2105 further away from the outer wall 112, and in the extending direction L of the first pin 214, the distance L1 between the first edge 2104 and the end of the first pin 214 is less than or equal to the distance L2 between the second edge 2105 and the end of the first pin 214.

[0143] The conductor 2101 and the first conductor 210 are the main components that realize the conductive function. The insulating layer 2102 can insulate and isolate the conductor 2101 from the stator core 100.

[0144] The first pin 214 protrudes from the first opening 2103 to facilitate connection with other first conductors 210, and reduces interference between the insulating layer 2102 and the connection between the first pin 214 and the other first conductors 210.

[0145] As shown in Figure 9, the embodiment of this application allows the insulating layer 2102 to have a relatively large length in the portion close to the outer wall 112, and when another first conductor 210 passes between the insulating layer 2102 and the outer wall 112, the insulating properties between the two first conductors 210 can be improved.

[0146] In some embodiments, the angle α between the plane on which the first opening 2103 is located and a virtual plane is between 0° and 30°, the virtual plane is perpendicular to the extending direction L of the first pin 214 and passes through the second edge 2105.

[0147] In the embodiments of this application, by limiting the angle α to 0° to 30°, a balance can be struck between the area covered by the insulating layer 2102 on the conductor 2101 and the exposed size of the first pin 214, thereby improving insulation performance and facilitating connection between the first pin 214 and other structures.

[0148] Selectively, α is 0°, 5°, 10°, 15°, 20°, 25°, or 30°.

[0149] In some embodiments, α is 5° to 30°. The first opening 2103 is angled. Embodiments of this application can improve insulation reliability.

[0150] In some embodiments, the first conductor 210 further includes a first connecting arm 216 and a second connecting arm 217, wherein a first pin 214 is connected to one socket 2011 via the first connecting arm 216, and a second pin 215 is connected to another socket 2011 via the second connecting arm 217.

[0151] Selectively, the first connecting arm 216 and the second connecting arm 217 are located outside the stator core 100.

[0152] Selectively, the first connecting arm 216, the second connecting arm 217, the multiple insertion parts 2011, the first pin 214, and the second pin 215 are integrated into a single structure.

[0153] The position of the first pin 214 can be adjusted by controlling the shape and size of the first connecting arm 216, and the position of the second pin 215 can be adjusted by controlling the shape and size of the second connecting arm 217, thereby allowing the first pin 214 and the second pin 215 to be positioned appropriately.

[0154] For example, when the first pin 214 and the second pin 215 are welded to each other, the effect of the high temperature during welding on other components of the first conductor can be reduced, and the welding operation for the first pin 214 and the second pin 215 can be facilitated.

[0155] In some embodiments, the stator winding 200 includes a plurality of coil units 200a arranged in a stack along the axial direction D. Of two adjacent coil units 200a, the first connecting arm 216 and the second connecting arm 217 of at least one first conductor 210 of one coil unit 200a are folded back toward the side away from the other coil unit 200a.

[0156] By folding back the first connecting arm 216 and the second connecting arm 217 of the first conductor 210, the pitch of the connection structure 2145 of the two coil units 200a can be increased, reducing the insulation requirements in the connection structure 2145, decreasing process complexity, and improving insulation reliability.

[0157] The embodiment of this application allows for greater stability and alignment of the portion located on the outside of the outer wall of the coil unit 200a.

[0158] In some embodiments, of two adjacent coil units 200a, the first connecting arms 216 and the second connecting arms 217 of the multiple first conductors 210 of one coil unit 200a are both folded back toward the side away from the other coil unit 200a.

[0159] As shown in Figure 11, in some embodiments, of two adjacent coil units 200a, the first connecting arm 216 and the second connecting arm 217 of the first conductor 210 of one coil unit 200a are folded back to one side along the axial direction D, and the first connecting arm 216 and the second connecting arm 217 of the first conductor 210 of the other coil unit 200a are folded back to the other side along the axial direction D.

[0160] The embodiment of this application reduces the degree of bending of the first connecting arm 216 and the second connecting arm 217, increases the outer diameter of the stator core, improves motor performance, and enables the output of a larger torque.

[0161] As shown in Figure 12, in some other embodiments, the first connecting arm 216 and the second connecting arm 217 of the first conductor 210 of two adjacent coil units 200a are folded back to the same side along the axial direction D. The degree of folding of the first connecting arm 216 and the second connecting arm 217 of one coil unit 200a is greater than the degree of folding of the first connecting arm 216 and the second connecting arm 217 of the other coil unit 200a.

[0162] The embodiment of this application increases the degree of folding of the first connecting arm 216 and the second connecting arm 217, thereby reducing the maximum size along the radial direction of the stator and lowering the total weight of the motor.

[0163] In some embodiments, the minimum pitch F of the connection structure 2145 between two adjacent coil units 200a in the axial direction D is 1 mm or more. Embodiments of this application can increase the electrical clearance of the stator, improve the insulation performance of the stator, enhance the reliability of the stator, and extend the service life of the stator.

[0164] The span between adjacent insertion portions 2011 of the first conductor 210 may be the full distance, long distance, or short distance to accommodate different windings.

[0165] In some embodiments, the span between two adjacent insertion portions 2011 of at least one first conductor 210 is equal to the pole distance. That is, the span between two adjacent insertion portions 2011 of at least one first conductor 210 is the total distance.

[0166] The embodiment of this application allows for a simplification of the winding structure of the first conductor.

[0167] In some other embodiments, the span between two adjacent insertions 2011 of at least one first conductor 210 is smaller than the pole distance. Short-distance windings can reduce spatial harmonics and improve NVH.

[0168] Figure 13 is a schematic diagram of the structure of a motor stator according to some other embodiments of the present application, Figure 14 is a schematic diagram of the structure of the coil unit of Figure 13, Figure 15 is a schematic diagram of the structure of the first conductor of the stator according to some embodiments of the present application, Figure 16 is a schematic diagram of one of the assembly processes of the stator of Figure 13, and Figure 17 is another schematic diagram of the assembly process of the stator of Figure 13.

[0169] In some embodiments, as shown in Figures 13 to 17, the multiple first conductors 210 of the coil unit 200a are distributed in a staggered manner along the circumferential direction. Each first conductor 210 includes a first insertion portion 211 and a second insertion portion 212 connected to each other. The first insertion portion 211 and the second insertion portion 212 are each inserted into different winding slots 120, and within the same winding slot 120, the first insertion portion 211 of one first conductor 210 is stacked with the second insertion portion 212 of another first conductor 210 of the coil unit 200a.

[0170] The distribution of multiple first conductors 210 that are offset along the circumferential direction means that neither of the multiple first conductors 210 completely overlaps along the axial direction, and that the multiple first conductors 210 are at least partially offset along the circumferential direction. Exemplarily, as shown in Figure 16, adjacent first conductors 210 offset one winding slot 120 along the circumferential direction.

[0171] When the first insertion portion 211 of one first conductor 210 is stacked with the second insertion portion 212 of another first conductor 210 of the coil unit 200a, it means that the first insertion portion of one first conductor 210 and the second insertion portion 212 of another first conductor 210 of the coil unit 200a are stacked along the axial direction of the stator core 100.

[0172] In the above-described technical proposal, the first insertion portion 211 and the second insertion portion 212 of the first conductor 210 are inserted into different winding slots 120, thereby improving the relative positional stability between the first conductor 210 and the stator core 100. The first insertion portion 211 of one first conductor 210 is stacked with the second insertion portion 212 of another first conductor 210 in the coil unit 200a, thereby stacking and fitting these two first conductors 210 together, improving the relative positional stability between multiple first conductors 210 in the coil unit 200a. Therefore, the embodiment of this application can not only simplify the motor structure and improve the assembly efficiency of the motor, but also improve the relative positional stability between each component in the stator, thereby extending the service life of the stator.

[0173] In some embodiments, the first insertion portion 211 and the second insertion portion 212 of the same first conductor 210 are arranged circumferentially, and within either one winding slot 120, the first insertion portion 211 of one first conductor 210 of the coil unit 200a is located on the side of the second insertion portion 212 of another first conductor 210 of the coil unit 200a that is closer to the bottom wall of the winding slot 120.

[0174] The circumferential direction may be either clockwise or counterclockwise.

[0175] Selectively, as shown in Figures 16 and 17, one or more additional winding slots 120 may be provided between the winding slot 120 corresponding to the first insertion portion 211 and the winding slot 120 corresponding to the second insertion portion 212. In the above technical proposal, by providing the first conductor 210 to span multiple winding slots 120 via the first insertion portion 211 and the second insertion portion 212, the size of the first conductor 210 itself can be increased, while at least a portion of other first conductors 210 of the same coil unit 200a can be inserted into these multiple winding slots 120, thereby fitting the multiple first conductors 210 together and improving the stability of the relative positions between the multiple first conductors 210.

[0176] In the above proposed technology, the first insertion portion 211 of each first conductor 210 is located closer to the bottom wall of any one of the winding slots 120, so that multiple first conductors 210 can be arranged in sequence, overlapping and fitted together to form a coil unit 200a having two layers of windings. Furthermore, the first insertion portion 211 of each first conductor 210 is located on one of the winding layers, and the second insertion portion 212 is located on the winding of the other layer, so that the multiple first conductors 210 are fitted together and stoppered from each other, thereby improving the stability of the relative positions between the multiple first conductors 210 in the coil unit 200a.

[0177] In the stator according to the embodiment of this application, the coil unit 200a of the stator winding 200 may be considered to include two layers of winding, and the first insertion portion 211 and the second insertion portion 212 of the same first conductor 210 are located on different winding layers. For example, the coil unit 200a includes a high-layer winding and a low-layer winding, and the first insertion portion 211 of the same first conductor 210 may be located on the low-layer winding, and the second insertion portion 212 may be located on the high-layer winding, thereby mating multiple first conductors 210 with one another. The low-layer winding is, for example, a winding layer close to the bottom wall of the winding slot 120, and the high-layer winding is, for example, a winding layer away from the bottom wall of the winding slot 120. In other embodiments, the first insertion portion 211 of the same first conductor 210 may further be located on the high-layer winding, and the second insertion portion 212 may be located on the low-layer winding.

[0178] In some embodiments, the span between the first insertion portion 211 and the second insertion portion 212 of at least one first conductor 210 is equal to the pole distance, which simplifies the winding structure of the first conductor 210. For example, if the span between the first insertion portion 211 and the second insertion portion 212 of the same first conductor 210 is six winding slots 120, then the pole distance is six winding slots 120.

[0179] In some embodiments, the span between the first insertion portion 211 and the second insertion portion 212 of each first conductor 210 is equal to the pole distance.

[0180] Figure 18 is a schematic diagram of the stator structure from a different viewpoint according to some embodiments of this application. Figure 19 is a schematic diagram of the stator structure from yet another viewpoint according to some embodiments of this application. Figure 20 is a schematic diagram of the localized structure at A in Figure 19.

[0181] In some embodiments, as shown in Figures 13 to 19, the stator winding 200 includes a plurality of coil units 200a arranged in a stack along the axial direction of the stator core 100.

[0182] In the above proposed technology, the amount of magnetic flux in the stator can be improved by installing multiple coil units 200a.

[0183] If the stator winding 200 includes multiple coil units 200a, multiple coil units 200a may be inserted into the winding slots 120 of the stator core 100 in the same step. Alternatively, one coil unit 200a may be inserted into the winding slots 120 of the stator core 100 in multiple steps. When inserting one coil unit 200a into the winding slots 120 of the stator core 100, multiple first conductors 210 may first be connected to one coil unit 200a, and the entire coil unit 200a may be inserted into the multiple winding slots 120 of the stator core 100, or one first conductor 210 may be inserted into the winding slots 120 in multiple steps.

[0184] In some embodiments, the first insertion portion 211 and the second insertion portion 212 of the same first conductor 210 are arranged circumferentially. The first conductor 210 further includes a connecting portion 213 that connects the first insertion portion 211 and the second insertion portion 212.

[0185] Selectively, the connector 213 may be integrally installed with the first insertion part 211 and the second insertion part 212. In other embodiments, the connector 213 may be installed separately from the first insertion part 211 and the second insertion part 212.

[0186] In the above proposed technology, the first insertion part 211 and the second insertion part 212 can be connected via the connecting part 213 at the end of the curl clip.

[0187] In some embodiments, the connecting portion 213 is located on the side of the first insertion portion 211 and the second insertion portion 212 that faces the center of the stator core 100.

[0188] In the above proposed technology, by installing the connecting portion 213 inside the stator core 100, the welding of multiple first conductors 210 inside the stator core 100 can be reduced, thereby lowering the difficulty of the process.

[0189] In some embodiments, the connector 213 includes a first connector 213a and a second connector 213b, wherein the first connector 213a extends from the end of the first insertion part 211 closer to the center of the stator core 100 and is installed bent diagonally toward the second insertion part 212, and the second connector 213b extends from the end of the second insertion part 212 closer to the center of the stator core 100 and is installed bent diagonally toward the first insertion part 211, and the first connector 213a is connected to the second connector 213b.

[0190] In the above proposed technology, the first connecting portion 213a and the second connecting portion 213b are molded to extend in directions close to each other, thereby reducing the overall size of the connecting portion 213 and the amount of space occupied by the connecting portion 213 within the center of the stator core 100.

[0191] Selectively, among two adjacent first conductors 210 within the same coil unit 200a, the first connection portion 213a of one first conductor 210 and the second connection portion 213b of the other first conductor 210 are arranged to intersect and stacked along the axial direction. This stops the first connection portion 213a and the second connection portion 213b of the two first conductors 210 from each other, improving the stability of the relative positions between the multiple first conductors 210.

[0192] Selectively, among three first conductors 210 adjacent to each other circumferentially within the same coil unit 200a, the first connection portion 213a of one of the first conductors 210 is located on the side of the second connection portion 213b of the preceding first conductor 210 that is closer to the bottom wall of the winding slot 120, and the second connection portion 213b of one of the first conductors 210 is located on the side of the first connection portion 213a of the following first conductor 210 that is further away from the bottom wall of the winding slot 120.

[0193] In the above solution, the first connection portion 213a of one of the first conductors 210 is located on the side of the second connection portion 213b of the preceding first conductor 210 that is closer to the bottom wall of the winding slot 120, and the axial positional relationship between the first connection portion 213a and the second connection portion 213b is explained using only the bottom wall of the winding slot 120 as a reference. Similarly, if the second connection portion 213b of one of the first conductors 210 is located on the side of the first connection portion 213a of the following first conductor 210 that is further away from the bottom wall of the winding slot 120, the positional relationship between the second connection portion 213b and the first connection portion 213a is explained using only the bottom wall of the winding slot 120 as a reference.

[0194] As described above, the circumferential direction may be clockwise or counterclockwise. When the circumferential direction is clockwise, the first conductor 210 located in front of one of the first conductors 210 is the first conductor 210 located on the counterclockwise side of the first conductor 210, and the first conductor 210 located behind one of the first conductors 210 is the first conductor 210 located on the clockwise side of the first conductor 210.

[0195] In the embodiments of this application, of the three first conductors 210 arranged circumferentially within the same coil unit 200a, the three first conductors 210 are, for example, conductor X1, conductor X2, and conductor X3 in order circumferentially, the first connection portion 213a of conductor X2 is located on the side of the second connection portion 213b of conductor X1 toward the bottom wall of the winding slot 120, and the second connection portion 213b of conductor X2 is located away from the bottom wall of the winding slot 120 of the first connection portion 213a of conductor X3 Located on the receiving side, that is, the second connecting portion 213b of conductor X2 crimps the first connecting portion 213a of conductor X3 toward the bottom wall of the winding slot 120, while the first connecting portion 213a of conductor X1 crimps the second connecting portion 213b of conductor X2 toward the bottom wall of the winding slot 120, that is, the first connecting portion 213a of conductor X2 is crimped, and the second connecting portion 213b of conductor X2 crimps another first connecting portion 213a, so that multiple first conductors 210 are fitted together in sequence.

[0196] Selectively, conductors X1, X2, and X3 may be installed adjacent to each other, or another first conductor 210 may be installed between conductor X1 and conductor X2, and another first conductor 210 may be installed between conductor X2 and conductor X3.

[0197] In some embodiments, the multiple first conductors 210 are arranged alternately, with the first connection portion 213a of one of the first conductors 210 located on the side of the second connection portion 213b of the preceding multiple first conductors 210 that is closer to the bottom wall of the winding slot 120, and the second connection portion 213b of one of the first conductors 210 located on the side of the first connection portion 213a of the following multiple first conductors 210 that is further away from the bottom wall of the winding slot 120.

[0198] In the above proposed technology, the first connection portion 213a of the first conductor 210 is pressed against the bottom wall of the winding slot 120 by the second connection portions 213b of the other multiple first conductors 210, while the second connection portions 213b of the first conductor 210 crimp the first connection portions 213a of the other multiple first conductors 210 toward the bottom wall of the winding slot 120, thereby laminating and fitting the multiple first conductors 210 in sequence, thereby improving the stability of the relative positions between the multiple first conductors 210.

[0199] Figure 21 is a schematic diagram of the partial structure of the first conductor 210 of the stator according to some embodiments of the present application, Figure 22 is a schematic diagram of the partial structure of the first conductor 210 of the stator according to another embodiment of the present application, Figure 23 is a schematic diagram of the partial structure of the first conductor 210 of the stator according to yet another embodiment of the present application, and Figure 24 is a schematic diagram of the partial structure of the first conductor 210 of the stator according to yet another embodiment of the present application.

[0200] In some embodiments, as shown in Figures 21 to 23, the connecting portion 213 further includes a bent portion 213c which is made up of a first connecting portion 213a and a second connecting portion 213b.

[0201] There are various methods for installing the bent portion 213c. The bent portion 213c may be formed by folding back a portion or the entirety of the connecting portion 213 in a manner such as twisting, bending, outward, or folding.

[0202] In the above proposed technology, by installing the bent portion 213c, the axial distance between the first insertion portion 211 and the second insertion portion 212 can be changed, further facilitating the installation of the first insertion portion 211 and the second insertion portion 212 on different winding layers, improving the problem of cramped space in the center of the stator core 100, and reducing the risk of interference between different first conductors 210 when the first insertion portion 211 and the second insertion portion 212 cross layers, as well as the risk of damage to the insulating coating of the first conductor 210.

[0203] In some embodiments, as shown in Figure 24, the first conductor 210 may include a plurality of bent portions 213c. Selectively, the first conductor 210 may omit the first connecting portion 213a and the second connecting portion 213b.

[0204] In some embodiments, the first conductor 210 is a single-piece molded structure, and for example, the first insertion portion 211, the second insertion portion 212, and the connecting portion 213 are all single-piece molded structures.

[0205] Selectively, the first insertion part 211, the second insertion part 212, and the connecting part 213 are integrally molded structures and exhibit a U-shaped structure, with the first insertion part 211 and the second insertion part 212 being the two arm parts of the U-shaped structure, and the connecting part 213 being the bottom part of the U-shaped structure.

[0206] In the above proposed technology, when the first conductor 210 is integrally molded, for example, when the first insertion part 211, the second insertion part 212 and the connecting part 213 are integrally molded, the first conductor 210 has relatively high connection strength and the service life of the first conductor 210 can be improved. The first insertion part 211, the second insertion part 212 and the connecting part 213, which are selectively integrally molded, are formed by deformation from a conductor. For example, when the first conductor 210 is a rectangular wire, the first conductor 210 may be mold-formed after varnish removal and punching of a rectangular conductor. The wound rectangular conductor is leveled and then laser-removed at the corresponding length positions, and after varnish removal is complete, it is precisely punched out. The punched rectangular conductor is then assembled in the winding slot 120 after forming the first conductor 210 through mold 3D molding and one-time 3D press molding. Because the 3D molding process for punching out the first conductor 210, removing varnish, and 3D molding is easily controlled, there is no need to cut the conductor, reducing process complexity and improving the operational efficiency of the production line.

[0207] In some embodiments, as shown in Figures 13 to 20, the first conductor 210 further includes a first pin 214 and a second pin 215, the first pin 214 being connected to the end of the first insertion portion 211 away from the connection portion 213, and the second pin 215 being connected to the end of the second insertion portion 212 away from the connection portion 213, and the coil unit 200a includes a plurality of conductive branches 201, each containing a plurality of first conductors 210 connected in series, wherein the first pin 214 of one of any two adjacent first conductors 210 of the conductive branch 201 is connected to the second pin 215 of the other first conductor 210.

[0208] Selectively, the first pin 214 and the second pin 215 are formed to extend radially along the stator core 100, away from the center of the stator core 100.

[0209] In the above proposed technology, a first pin 214 and a second pin 215 are further extended from the first conductor 210, thereby allowing the first conductor 210 to be connected to other first conductors 210 via the first pin 214 and the second pin 215. At least two first conductors 210 in the coil unit 200a are connected to each other via the first pin 214 and the second pin 215, and are connected in series to form a conductive branch 201.

[0210] In some embodiments, as shown in Figures 3 to 8, the first pin 214 of one of two adjacent first conductors 210 of the conductive branch 201 and the second pin 215 of the other first conductor 210 are connected in an overlapping manner along the axial direction. This improves the contact area between the first pin 214 and the second pin 215, ensures the stability of the relative position between the first pin 214 and the second pin 215, and improves the amount of current passing through the first pin 214 and the second pin 215.

[0211] Selectively, of at least two first conductors 210, the first pin 214 of one and the second pin 215 of the other are fully overlapped along the axial direction of the stator core 100 and connected to each other.

[0212] In the above proposed technology, the two first conductors 210 can be arranged so that the first pin 214 and the second pin 215 completely overlap, thereby improving the contact area between the first pin 214 and the second pin 215 and ensuring that there is sufficient current-passing area between the two first conductors 210. Furthermore, the first pin 214 and the second pin 215 of the first conductors 210 can be connected in series with each other, thereby forming a complete conductive branch 201.

[0213] Selectively, in any two adjacent first conductors 210 of the conductive branch 201, the first pin 214 and the second pin 215 are welded to each other in an overlapping region. Exemplarily, the first pin 214 and the second pin 215 are welded by TIG (non-fusible electrode gas shielded arc welding), laser welding, or by other means.

[0214] In some embodiments, as shown in Figures 3 to 8, the first pin 214 and the second pin 215 form a connection structure 2145 in a region where they overlap and connect along the axial direction, and the coil unit 200a includes a plurality of connection structures 2145 that are spaced apart along the circumferential direction.

[0215] The connection structure 2145 refers to the overlapping region of the first pin 214 and the second pin 215 that are connected to each other. Optionally, the first pin 214 and the second pin 215 may be welded to each other in the region where the connection structure 2145 is located.

[0216] In the above proposed technology, multiple connecting structures 2145 are spaced apart along the circumferential direction, with gaps between adjacent connecting structures 2145. When the first pin 214 and the second pin 215 are welded to each other to form the connecting structure 2145, the welding distance can be increased, improving mutual influence during welding.

[0217] In some embodiments, as shown in Figures 3 to 8, the stator winding 200 includes a plurality of coil units 200a arranged in a stack along the axial direction, and the connecting structure 2145 of two adjacent coil units 200a is offset in the circumferential direction.

[0218] In the above technical proposal, the connecting structures 2145 between two adjacent coil units 200a are spaced apart along the circumferential direction, allowing for a larger pitch between these two connecting structures 2145. Furthermore, when the first pin 214 and the second pin 215 are welded together to form the connecting structure 2145, the welding distance can be increased, improving the mutual influence during welding. Additionally, when the coil units 200a are inserted into the winding slots 120, the distance between the connecting structures 2145 between different coil units 200a is sufficiently large, eliminating the need for continuous flare deformation treatment of the first pin 214 and the second pin 215 within the connecting structure 2145. This reduces process complexity, further ensures the positional stability of the first pin 214 and the second pin 215 without requiring flare deformation treatment, reducing the risk of welding cracks. Moreover, it increases the electrical clearance between the connecting structures 2145, improving the safety performance of the stator.

[0219] The above technical proposal can further shorten the stator axial size, making the motor axial size smaller and lighter, reducing the unsprung mass in the finished vehicle, improving chassis operability through the placement of a multi-link suspension structure and dummy springs, and increasing the electrical gap between the connection structures 2145 by circumferentially offsetting the connection structures 2145 of two adjacent coil units 200a, reducing the insulation requirements in the connection structures 2145, reducing process complexity, saving raw materials, and increasing the operating cycle time of the production line.

[0220] Selectively, the connecting structure 2145 of two adjacent coil units 200a along the axial direction is installed with a gap in between along the circumferential direction.

[0221] Selectively, the connecting structures 2145 of the coil units 200a located on both axial sides of the same coil unit 200a are stacked on top of each other along the axial direction, thereby maximizing the circumferential pitch between the connecting structures 2145 of two adjacent coil units 200a.

[0222] For example, there are four coil units 200a, and the four coil units 200a are the first, second, third, and fourth coil units, respectively, in the direction away from the bottom wall of the winding slot 120. The connecting structures 2145 between the first and second coil units, the second and third coil units, and the third and fourth coil units are installed at intervals along the circumferential direction. Furthermore, the connecting structures 2145 between the first and third coil units, and the second and fourth coil units are stacked on top of each other along the axial direction.

[0223] Selectively, the multiple connection structures 2145 of each coil unit 200a are uniformly distributed along the circumferential direction, increasing the pitch between the connection structures 2145 of two adjacent coil units 200a.

[0224] In some embodiments, the first conductor 210 further includes a first connecting arm 216 and a second connecting arm 217, wherein the first insertion portion 211 and the first pin 214 are connected via the first connecting arm 216, and the second pin 215 and the second insertion portion 212 are connected via the second connecting arm 217.

[0225] In some embodiments, of two adjacent first conductors 210 along the circumferential direction, the second connecting arm 217 of one first conductor 210 passes between the second pin 215 of the other first conductor 210 and the stator core 100.

[0226] Selectively, the first insertion portion 211 and the second insertion portion 212 of the first conductor 210 are spaced apart along the circumferential direction, connected to each other, and exhibit a substantially U-shaped structure, where the first insertion portion 211 is one arm of the U-shaped structure, and the second insertion portion 212 is another arm of the U-shaped structure, and the first connecting arm 216 is molded to extend circumferentially away from the second insertion portion 212, i.e., the first connecting arm 216 is molded to extend away from the interior of the U-shaped structure. Similarly, the second connecting arm 217 is molded to extend away from the interior of the U-shaped structure.

[0227] Selectively, the first connecting arm 216 and the second connecting arm 217 are located outside the stator core 100.

[0228] Selectively, the first connecting arm 216 and the first insertion portion 211 are integrally molded to improve the connection strength between the first connecting arm 216 and the first insertion portion 211. Selectively, the second connecting arm 217 and the second insertion portion 212 are integrally molded to improve the connection strength between the second connecting arm 217 and the second insertion portion 212.

[0229] Selectively, the first connecting arm 216 and the first pin 214 are integrally molded to improve the connection strength between the first connecting arm 216 and the first pin 214. Selectively, the second connecting arm 217 and the second pin 215 are integrally molded to improve the connection strength between the second connecting arm 217 and the second pin 215.

[0230] Selectively, the first pin 214 is formed to extend radially from the end of the first connecting arm 216 away from the first insertion portion 211, in a direction away from the center of the stator core 100. Selectively, the second pin 215 is formed to extend radially from the end of the second connecting arm 217 away from the second insertion portion 212, in a direction away from the second insertion portion 212.

[0231] In the above proposed technology, the position of the first pin 214 can be adjusted by controlling the shape and size of the first connecting arm 216, and the position of the second pin 215 can be adjusted by controlling the shape and size of the second connecting arm 217, thereby allowing the first pin 214 and the second pin 215 to be positioned appropriately. The second connecting arm 217 of one first conductor 210 passes between the second pin 215 of another first conductor 210 and the stator core 100, that is, the second pin 215 of the other first conductor 210 is located on the side of the second connecting arm 217 away from the center of the stator core 100, that is, the second pin 215 is located outside the second connecting arm 217 of the other first conductor 210. When the first pin 214 and the second pin 215 are welded together, the impact of high temperatures during welding on other parts of the first conductor 210 is reduced, and the welding operation for the first pin 214 and the second pin 215 is made easier.

[0232] Figure 25 is a schematic diagram of the local structure of a stator coil unit 200a according to some embodiments of this application.

[0233] In some embodiments, as shown in Figures 13 to 25, a relief recess 217a is provided on the side of the second connecting arm 217 away from the stator core 100 to accommodate a second pin 215 of another first conductor 210.

[0234] Selectively, the second pins 215 are located on the side of the relief recess 217a that is away from the center of the stator core 100. Selectively, at least some of the second pins 215 are located in the corresponding relief recess 217a.

[0235] The shape and installation method of the relief recess 217a can vary. When the second pin 215 and the second connecting arm 217 are smoothly and transiently connected, the relief recess 217a may take on an arc shape, which facilitates the processing and molding of the relief recess 217a, while also allowing the shape of the relief recess 217a to better fit with the connection shape of the second pin 215 and the second connecting arm 217, and allowing the relief recess 217a to better yield its position to the second pin 215.

[0236] In the above proposed technology, by providing a relief recess 217a in the second connecting arm 217, it can yield its position to the second pin 215, avoiding the stacking of the second pin 215 and the other first conductors 210 with the second connecting arm 217, and reducing the axial thickness of the coil unit 200a. By providing the relief recess 217a, the height of the end of the stator winding 200 is reduced, the size of the outer envelope of the stator is relatively small, the motor size is smaller, and the motor placement is easier. Furthermore, by providing the relief recess 217a, the interaction force due to positional interference between the second pin 215 and the second connecting arm 217 can be further improved, affecting the positional stability of the second pin 215 and, furthermore, affecting the welding strength.

[0237] Selectively, of two adjacent first conductors 210 along the circumferential direction, the first connecting arm 216 of one first conductor 210 passes between the first pin 214 of the other first conductor 210 and the stator core 100. Selectively, on the side of the first connecting arm 216 away from the stator core 100, there is a relief to allow the first pin 214 of the other first conductor 210 to pass. Concave A department will be established.

[0238] In some embodiments, the second connecting arm 217 is bent at a position corresponding to the relief recess 217a, forming a protrusion 217b that projects toward the stator core 100.

[0239] In the above embodiment, by providing a protrusion 217b corresponding to the relief recess 217a, the second connecting arm 217 forms the relief recess 217a and the protrusion 217b through a bending process, thereby simplifying the molding process of the second connecting arm 217.

[0240] In some embodiments, as shown in Figures 15 to 20, the first pin 214 and the second pin 215 are formed to extend radially, away from the center of the stator core 100.

[0241] In the above embodiment, if the first pin 214 and the second pin 215 are formed by extending radially along a direction away from the center of the stator core 100, the pitch between the first pin 214, the second pin 215 and other components such as the first insertion portion 211 can be increased, and if the first pin 214 and the second pin 215, which are installed in an overlapping position, are welded to each other, the impact of high temperatures on other components can be reduced. If the first pin 214 and the second pin 215, which overlap each other, are formed by extending circumferentially along a direction closer to each other, the shape of the first conductor 210 can be simplified, the size of the first conductor 210 can be reduced, the height of the coil unit 200a away from the end of the stator core 100 can be reduced, the size of the outer envelope of the stator can be reduced, the weight of the first conductor 210 can be reduced, and the placement of the stator can be facilitated. The above embodiment further facilitates gripping the first pin 214 and the second pin 215 during welding and can be applied to mass production.

[0242] Figure 26 is a schematic diagram of the structure of two first conductors of a stator according to some other embodiments of this application, Figure 27 is a schematic diagram of the structure of Figure 26 from a different viewpoint, Figure 28 is a schematic diagram of the structure of a part of the first conductor of the stator shown in Figure 26, and Figure 29 is a schematic diagram of the structure of two first conductors of a stator according to some other embodiments of this application. Figure 30 is a schematic diagram of the structure from a different viewpoint of Figure 29, and Figure 31 is a schematic diagram of the structure of a part of the first conductor of the stator shown in Figure 29.

[0243] In some other embodiments, as shown in Figures 26 to 31, the first pin 214 and the second pin 215, which overlap each other, are molded to extend in a direction that is close to each other in the circumferential direction.

[0244] The embodiments of this application can simplify the shape of the first conductor 210, reduce the size of the first conductor 210, reduce the height of the coil unit 200a away from the end of the stator core 100, reduce the size of the outer envelope of the stator, reduce the weight of the first conductor 210, and facilitate the placement of the stator.

[0245] In some embodiments, when the first pin 214 and the second pin 215 overlap each other and are formed to extend circumferentially in a direction close to each other, when the first pin 214 and the second pin 215 overlap each other, a structural form such as circumferential overlap or cross overlap can be selected. The first pin 214 and the second pin 215 may directly overlap each other, or, optionally, as shown in Figures 26 to 28, the first pin 214 and the second pin 215 may be provided with welded projections 218, which are formed to protrude in a direction away from the center of the stator core 100, and the orthographic shape of the welded projection 218 along the axial direction may be a semicircular or polygonal shape. The welded projections 218 of the first pin 214 and the second pin 215 are stacked on top of each other along the axial direction. During the manufacturing process of the stator, the welding projections 218 of the first pin 214 and the second pin 215 can be clamped and then welded together at the overlapping position, and the welding may be performed using laser or arc welding. Directly overlapping the first pin 214 and the second pin 215 in the circumferential direction saves radial space of the stator, further reducing the height of the ends of the coil unit 200a, and decreasing the size of the outer envelope of the stator and the weight of the stator.

[0246] Figure 32 is a schematic diagram of the structure of the second conductor 220 of the stator according to some embodiments of this application.

[0247] As shown in Figure 32, the coil unit further includes a second conductor 220 which includes a single insertion portion 2011 that is inserted into the winding slot 120. The structure of the second conductor 220 can be simplified and its manufacture can be facilitated.

[0248] Selectively, the second conductor 220 includes one insertion portion 2011 and one connecting portion 221, the insertion portion 2011 and the connecting portion 221 being integrally molded structures and exhibiting an I-shape, and the insertion portion 2011 and the connecting portion 221 are distributed sequentially along the extending direction of the I-shape. The two second conductors 220 are connected to each other by the connecting portion 221 to form a shape similar to the first conductor 210.

[0249] In some embodiments, the coil unit may include only the first conductor 210.

[0250] Figure 33 is a schematic diagram of the structure of another first conductor 210 of the stator according to some embodiments of the present application, and Figure 34 is a schematic diagram of the structure of the stator including the first conductor 210 shown in Figure 33.

[0251] In some embodiments, as shown in Figures 33 and 34, each first conductor 210 includes one insertion portion 2011, or each first conductor 210 is continuously bent and includes at least three insertion portions 2011, with at least three insertion portions 2011 of the first conductor 210 each being inserted into a different winding slot 120.

[0252] In the above embodiment, by inserting three or more insertion portions 2011 of the same first conductor 210 into different winding slots 120, the contact area between the first conductor 210 and the stator core 100 can be improved, and the stability of the relative position between the first conductor 210 and the stator core 100 can be improved.

[0253] Selectively, the first conductor 210 may include eight insertion portions 2011.

[0254] Embodiments of the present application can adopt combinations of different forms of the first conductor 210 and the second conductor 220, thereby reducing the number of types of pre-formed distributed coil units 200a, reducing the complexity of the process, and minimizing the mold input cost.

[0255] In some embodiments, the first insertion part 211 and the second insertion part 212 of the same first conductor 210 are symmetrically arranged.

[0256] Optionally, when the first conductor 210 includes the first pin 214 and the second pin 215, the first pin 214, the first insertion part 211 of the same first conductor 210, the second pin 215, and the second insertion part 212 are symmetrically arranged.

[0257] Optionally, when the first conductor 210 includes the first pin 214, the first connection arm 216, the second pin 215, and the second connection arm 217, the first pin 214, the first connection arm 216, the first insertion part 211 of the same first conductor 210, the second pin 215, the second connection arm 217, and the second insertion part 212 are symmetrically arranged.

[0258] In the above technical solution, the symmetrically arranged first insertion part 211 and the second insertion part 212 can balance the force received by the first conductor 210, thereby making the positions between the plurality of first conductors 210 to be inserted and fitted more stable.

[0259] FIG. 35 is a schematic diagram of the stator core of the stator according to some other embodiments of the present application, FIG. 36 is a schematic diagram of the stator according to some other embodiments of the present application, and FIG. 37 is a side view of the stator shown in FIG. 36.

[0260] In some embodiments, referring to FIGS. 35 to 37, winding slots 120 are provided on both end faces 110 along the axial direction of the stator core 100 itself.

[0261] In the above embodiment, by installing winding slots 120 on both sides of the stator core 100 in the axial direction, the stator windings 200 can be embedded on different sides of the stator core 100, and the same stator core 100 can accommodate more coil units 200a.

[0262] FIG. 38 is a partial cross-sectional view of the stator core of the stator according to some embodiments of the present application.

[0263] In some embodiments, as shown in FIG. 38, the winding slot 120 includes a bottom wall surface 121, two side wall surfaces 122 connected to the bottom wall surface 121, and two inclined surfaces 123 respectively connected to the two side wall surfaces 122. The two side wall surfaces 122 are installed at intervals along the circumferential direction, and a groove opening 124 is formed between the ends of the two inclined surfaces 123 away from the corresponding side wall surfaces 122.

[0264] In the above embodiment, by connecting the inclined surface 123 to the side wall surface 122, the size of the groove opening 124 can be increased, and it is possible to easily embed the coil unit 200a into the winding slot 120.

[0265] <000091​​​​​​​​​​​​As shown in Figure 39, in some embodiments, the groove surface of the winding slot 120 includes a bottom wall surface 121 and two side wall surfaces 122 connected to the bottom wall surface 121, the two side wall surfaces 122 spaced apart along the circumferential direction, and the insertion portion 2011 is located between the two side wall surfaces 122. A groove 124 is provided at the end of the winding slot 120 along the axial direction D, and the groove 124 and the bottom wall surface 121 face each other along the axial direction D. The circumferential size of the groove 124 is H1, and the circumferential pitch of the two side wall surfaces 122 is H2, where H1 ≤ H2.

[0269] In the embodiments of this application, the groove 124 can be made less than or equal to the groove width of the winding slot 120, thereby significantly reducing the pre-formed distributed winding assembly reserved space and conductor gap, achieving a copper filling factor of 75% or more, and by adopting axial wire insertion, the wiring process can be made more convenient and efficient.

[0270] Selectively, H1 is smaller than H2.

[0271] In some embodiments, referring to Figures 11 and 39, the winding slot 120 includes a mounting groove 125 that forms a recess in the side wall surface 122. The stator is inserted into the mounting groove 125 and further includes a stopper member 300 for restricting the movement of the insertion portion 2011 in the axial direction D.

[0272] By installing the mounting groove 125 and the stopper member 300, the risk of the insertion part 2011 detaching from the winding slot 120 can be reduced.

[0273] In some embodiments, the stopper member 300 may be an insulating member. The stopper member 300 can reinforce the insulation performance at the groove position of the stator winding 200. The stopper member 300 simultaneously performs the dual functions of insulation reinforcement and space stopper in the stator.

[0274] In some other embodiments, the stopper member 300 may be a magnetic member. After adopting a magnetic stopper member 300, the motor can moderately reduce the excitation current, improve the power factor, and improve motor efficiency. By reducing core losses, it can reduce motor temperature rise, reduce electromagnetic noise and vibration, and because the magnetic stopper member 300 is a magnetic conductor, it can reinforce the motor's magnetic leakage and reduce starting torque.

[0275] Selectively, the stopper member 300 can be inserted into the mounting groove 125 from the outer wall and pushed into the mounting groove 125 toward the inner wall to seal the groove opening 124 of the winding slot 120.

[0276] Selectively, in the embodiments of this application, if there are multiple coil units 200a, the coil units 200a can be sequentially laminated by the grooves 124 of the winding slot 120 and entered into the winding slot 120. Alternatively, the entire set of multiple coil units 200a can be press-fitted into the winding slot 120 through the entire grooves 124 of the winding slot 120. In the stator according to the embodiments of this application, the structure of the coil units 200a is simple, the wiring method is convenient and simple, and automated production is facilitated.

[0277] Selectively, the number of winding slots 120 and the number of first conductors 210 in the stator core 100 may be adjusted according to actual requirements. In the embodiments of this application, the number of winding slots 120 is described as 48, and the 48 winding slots 120 are evenly distributed in the stator core 100 along the circumferential direction. In the wiring process of the coil unit 200a, i.e., the coil unit 200a is placed in the winding slot 120 process, and one first conductor 210 is stacked in the winding slot 120 up to 42 times each time, and the entire 43rd to 48th conductors are inserted from the groove 124 of the winding slot 120 until they are bonded to the first conductors 210 located in the winding slot 120, in a manner that is clamped by a robotic hand. After one coil unit 200a is wired, the second and third coil units 200a are wired in order.

[0278] Optionally, the stator core 100 can be selected, which is wound and formed, improving the problem that the end material and the intermediate cylindrical material are wasted in the conventional process. There is only a part corresponding to the winding slot 120 in the scrap, that is, a part of the material removed to form the winding slot 120, improving the material utilization rate. And the forming process of the stator core 100 is simple, facilitating the realization of automation.

[0279] Optionally, the stator core 100 is die-cast with a composite material such as a high-permeability and low-loss sheet-shaped molded plastic, thereby facilitating the forming of the stator core 100 and simplifying the heat treatment process.

[0280] Optionally, the stator core 100 further adopts a split core and is combined, thereby having relatively high size and accuracy of the stator core 100, stable quality, high production efficiency, high material utilization rate, and reduced material cost.

[0281] Optionally, the stator core 100 may select one-sided slots or both-sided slots, that is, the winding slots 120 are installed on one side or both sides in the axial direction of the stator core 100. Then the coil unit 200a can achieve one-sided or both-sided wiring. The wiring method of the one-sided slots of the stator core 100 has a yoke portion that facilitates the mounting and fixing of the stator on the stator core 100. The wiring method of the both-sided slots of the stator core 100 has the technical advantages of improving the material utilization rate, motor efficiency, and power density, and reducing the weight and volume, etc.

[0282] The stator of the embodiment of the present application can be applied to motors with different numbers of phases and can fit different voltage and power ranges.

[0283] In some embodiments, the stator winding 200 includes three phase windings, which are a first phase winding, a second phase winding, and a third phase winding. Selectively, the first phase winding is a U-phase winding, the second phase winding is a V-phase winding, and the third phase winding is a W-phase winding.

[0284] Each phase winding may contain only one branch or multiple branches. These phase winding branches may also be called parallel branch connections.

[0285] The number of phase winding branches can be any integer, extending the range of applications for winding designs and fitting different voltage and power ranges.

[0286] In some embodiments, the stator winding 200 may be connected to a full-distance winding, a short-distance winding, or a multi-layer winding.

[0287] Selectively, if the stator winding 200 is a three-phase stator winding, the three-phase distribution configuration within each winding slot 120 can vary, for example, it may be a 12-pole, 36-slot structure, where the number of slots Q per pole per phase is 1. Taking 12 poles as an example, the number of slots in the winding slot 120 may be 36 slots, 72 slots, etc. By adjusting Q, harmonics of different orders such as the 5th, 7th, 11th, and 13th harmonics can be eliminated and reduced, thereby reducing torque pulsation and improving NVH.

[0288] Embodiments of this application further provide a motor including a rotor and a stator according to any one of the above embodiments, wherein the rotor is provided in a space formed by being surrounded by the inner walls of the stator core 100.

[0289] The motor in the embodiment of this application may be a generator or an electric motor.

[0290] Embodiments of this application further provide a powertrain including a reduction gear and the motor described above. The motor and the reduction gear are connected by a transmission. Specifically, the drive shaft of the motor and the input shaft of the reduction gear are connected by a transmission member such as a coupling, so that the driving force can be output from the flat wire motor to the reduction gear.

[0291] Embodiments of this application further provide a vehicle including the above-described powertrain, the powertrain being installed within the vehicle and providing the vehicle with power to operate. Specifically, in these embodiments, the vehicle may be a new energy vehicle driven by electric energy, for example, the new energy vehicle may be a hybrid electric vehicle, a pure electric vehicle, or a fuel cell electric vehicle, and may be a vehicle employing a highly efficient energy storage device such as a supercapacitor, flywheel battery, or flywheel energy storage device as an electrical energy source.

[0292] Figure 40 is a flowchart showing a method for manufacturing a stator according to several embodiments of this application.

[0293] Referring to Figure 40, an embodiment of the present application further provides a method for manufacturing a stator, which includes the following steps.

[0294] Step S01: A stator core 100 is provided, and a plurality of winding slots 120 are provided on the end face 110 of the stator core 100 along its own axial direction D, penetrating the inner wall 111 and outer wall 112 of the stator core 100, and the plurality of winding slots 120 are installed at intervals along the circumferential direction of the stator core 100.

[0295] Step S02: The coil unit 200a, which is pre-assembled by a plurality of first conductors 210, is press-fitted into a plurality of winding slots 120 along the axial direction D, thereby inserting the insertion portion 2011 of each first conductor 210 into the winding slot 120.

[0296] In this embodiment, first, a stator core having winding slots is provided, then multiple first conductors are assembled into coil units, and the entire pre-assembled coil unit is then placed into the winding slots. This effectively improves the assembly efficiency of the stator compared to inserting multiple first conductors into the winding slots one by one.

[0297] In some embodiments, before step S02, The steps include providing a linear conductor comprising a conductor and an insulating layer covering the outside of the conductor, The steps include removing the insulating layer from both ends of the conductor, The process includes the step of bending a conductor to form a first conductor which includes a plurality of insertion portions that are spaced apart.

[0298] In the above proposed technology, the first conductor is formed by directly bending a straight conductor after the insulating layers at both ends have been removed. This eliminates the need for later processes such as conductor cutting, reducing the complexity of the conductor manufacturing process and improving the manufacturing efficiency of the stator.

[0299] In some embodiments, the number of stator poles is 2p, and the stator pole distance is n winding slots. Prior to step S02, the step further includes providing 2p × n first conductors, each first conductor comprising a first insertion portion and a second insertion portion, and the span between the first insertion portion and the second insertion portion is n winding slots.

[0300] The step of pre-assembling multiple first conductors into a coil unit is: A step of providing an assembly mechanism including 2p × n slots, wherein the 2p × n slots are evenly arranged along the circumferential direction of the assembly mechanism, The steps include stacking (2p-1) × n first conductors sequentially in 2p × n slots that are opened along a counterclockwise direction, The steps include inserting the remaining n first conductors into slots of an assembly mechanism to form a coil unit, wherein in any one slot, the first insertion portion of one first conductor of the coil unit is located on the side closer to the bottom wall of the slot than the second insertion portion of another first conductor of the coil unit.

[0301] Some embodiments further include the following steps.

[0302] The pre-assembled coil unit is removed from the assembly mechanism. After removing the coil unit from the device structure, the process can proceed to step S02. In the above technical proposal, the span between the first insertion part and the second insertion part is equal to the pole distance, thus simplifying the winding structure of the first conductor. Within any one winding slot, the first insertion parts of the first conductors are all closer to the bottom wall of the winding slot, so that multiple first conductors can be arranged in sequence, overlapping and fitted together to form a coil unit having two layers of windings, and the first insertion part of the first conductor is located on one of the winding layers, and the second insertion part is located on the winding layer of the other, so that the multiple first conductors are fitted together and stoppered by each other, improving the stability of the relative positions between the multiple first conductors within the coil unit.

[0303] Figures 41 to 46 are different schematic diagrams of the manufacturing process of a stator according to several other embodiments of this application.

[0304] Referring to Figures 41 to 46, the manufacturing method of the embodiment of this application further includes the following steps prior to step S02.

[0305] Step S03, as shown in Figure 41, m × j first conductors 210 are provided, each first conductor 210 is continuously bent and includes 2 × k insertion portions 2011, where m, j, and k are all positive integers.

[0306] Step S04, as shown in Figures 42 and 43, m first conductors 210 are assembled to create a subcoil unit 200b, and j subcoil units 200b are manufactured. In step S05, as shown in Figures 44 to 46, j sub-coil units 200b are assembled to form a coil unit 200a.

[0307] In step S03, each first conductor 210 may include 2, 4, 6, 8, or 16 insertion portions 2011. Exemplarily, the first conductor 210 includes 4 insertion portions 2011.

[0308] For example, in step S04, the first conductors 210 are assembled sequentially as shown in Figure 42, and after m first conductors 210 have been assembled, the subcoil unit 200b shown in Figure 43 is created.

[0309] For example, by operations such as insertion and inversion, j sub-coil units 200b can be integrated to form a coil unit 200a.

[0310] By assembling multiple first conductors 210 in stages, the difficulty of assembly can be reduced and assembly efficiency can be improved.

[0311] In some embodiments, j is 2. In step S04, two "crescent-shaped" subcoil units 200b can be assembled first.

[0312] According to some embodiments of this application, referring to Figures 1 to 12, the stator includes a stator core 100 and stator windings 200. A plurality of winding slots 120 are provided on the end face 110 of the stator core 100 along its own axial direction D, penetrating the inner wall 111 and outer wall 112 of the stator core 100, and the plurality of winding slots 120 are spaced apart along the circumferential direction of the stator core 100. The direction of extension of the winding slots 120 is inclined with respect to the radial direction of the stator core 100.

[0313] The stator winding 200 includes a plurality of coil units 200a arranged in a stack along the axial direction D. Each coil unit 200a includes a plurality of first conductors 210 to which it is assembled.

[0314] The first conductor 210 is continuously bent and includes four insertion portions 2011, three connecting portions 213, a first pin 214, a second pin 215, a first connecting arm 216, and a second connecting arm 217.

[0315] The four insertion points 2011 are each inserted into different winding slots 120 and arranged circumferentially. Two adjacent insertion points 2011 are connected via a single connector 213. The connector 213, located inside the inner wall 111, is folded back and installed so that the two insertion points 2011 connected to the connector 213 are on different layers.

[0316] The two connection points 213 are located inside the inner wall 111. All connection points 213 located inside the inner wall 111 of the coil unit 200a are arranged in a line along the circumferential direction.

[0317] The first pin 214 and the second pin 215 are located at opposite ends of the first conductor 210. The first pin 214 is connected to one socket 2011 via a first connecting arm 216, and the second pin 215 is connected to another socket 2011 via a second connecting arm 217.

[0318] The first pin 214, the second pin 215, the first connecting arm 216, and the second connecting arm 217 are all located on the outside of the outer wall 112.

[0319] The coil unit 200a includes a plurality of conductive branches 201, each containing a plurality of first conductors 210 connected in series. Of any two adjacent first conductors 210 of a conductive branch 201, the first pin 214 of one first conductor 210 is welded to the second pin 215 of the other first conductor 210, forming a connecting structure 2145.

[0320] All connection structures 2145 of the coil unit 200a are installed spaced apart along the circumferential direction. Two adjacent connection structures 2145 of the coil unit 200a are offset in the circumferential direction.

[0321] It should be noted that, as long as they do not conflict, the embodiments and features in this application can be combined with each other.

[0322] Finally, it should be noted that the above embodiments are merely for illustrative purposes and not limiting purposes. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art can still modify the inventions described in the above embodiments or replace some of their technical features equally, but these modifications or replacements should be understood not to cause the essence of the invention to deviate from the spirit and scope of the inventions described in the embodiments of this application. [Explanation of Symbols]

[0323] 100, stator core, 110, end face, 111, inner wall, 112, outer wall, 120, winding slot, 121, bottom wall, 122, side wall, 123, slope, 124, groove, 125, mounting groove, 200, stator winding, 200a, coil unit, 201, conductive branch, 2011, insertion part, 200b, sub-coil unit, 210, First conductor, 211, First insertion part, 212, Second insertion part, 213, Connection part, 213a, First connection part, 213b, Second connection part, 213c, Bent part, 214, First pin, 215, Second pin, 2145, Connection structure, 216, First connection arm, 217, Second connection arm, 217a, Relief recess, 217b, Protrusion, 218, Welding projection, 2101, Conductor, 2102, Insulating layer, 2103, First opening, 2104, First edge, 2105, Second edge, 220, second conductor, 221, connection part, 300, stopper member, D, axial direction, L, extension direction.

Claims

1. It is a motor stator, A stator core, wherein the end face of the stator core along its own axial direction is provided with a plurality of winding slots that penetrate the inner wall and outer wall of the stator core, and the plurality of winding slots are installed at intervals along the circumferential direction of the stator core, A stator winding comprising at least one coil unit, wherein the coil unit comprises a plurality of first conductors to be assembled, each of the first conductors comprising a stator winding comprising at least one insertion portion to be inserted into the winding slot, At least two of the first conductors of the coil unit are distributed in a staggered manner along the circumferential direction. Each of the first conductors includes a plurality of insertion portions which are inserted into different winding slots. The stator winding has at least two insertion portions arranged in the axial direction within each winding slot, The coil unit includes a plurality of conductive branches, each of which includes a plurality of first conductors connected in series, and two adjacent first conductors of the conductive branch are connected to form a connection structure. All of the aforementioned connection structures of the coil unit are installed on the outside of the outer wall. A first pin and a second pin are provided at both ends of the first conductor. Of the two adjacent first conductors of the conductive branch, the first pin of one of the first conductors is connected to the second pin of the other first conductor to form the connection structure. The first conductor further includes a first connecting arm and a second connecting arm, wherein the first pin is connected to one of the insertion parts via the first connecting arm, and the second pin is connected to another of the insertion parts via the second connecting arm. A motor stator characterized in that a relief recess is provided on the side of the second connecting arm that is away from the stator core, for accommodating the second pin of another first conductor.

2. The first conductor further includes at least one connection portion, and adjacent insertion portions are connected via the connection portion. The stator according to claim 1, characterized in that at least one of the connecting portions is located on the inside of the inner wall.

3. The stator according to claim 2, characterized in that at least one of the connecting portions located on the inside of the inner wall is folded back in the axial direction, and the two insertion portions connected to the connecting portion that is thus folded back are in different layers.

4. The stator according to claim 3, characterized in that, in the axial direction, the maximum size of the connecting portion is greater than the sum of the sizes of the two insertion portions.

5. The stator according to claim 3, characterized in that all of the connecting portions located on the inside of the inner wall are arranged in a line along the circumferential direction.

6. Of the two adjacent first conductors of the conductive branch, the first pin of one of the first conductors overlaps the second pin of the other first conductor along the axial direction. The stator according to claim 1, characterized in that the first pin and the second pin are welded to each other in an overlapping region to form the connection structure.

7. The stator according to claim 1, characterized in that all of the connection structures of the coil unit are installed at intervals along the circumferential direction.

8. The stator winding includes a plurality of coil units stacked along the axial direction, wherein at least one of the connection structures of one of two adjacent coil units is offset in the circumferential direction from the connection structure of the other coil unit, as described in claim 7.

9. The first pin and the second pin are formed to extend radially along a direction away from the center of the stator core, or The stator according to claim 1, characterized in that the first pin and the second pin, which overlap each other, are molded to extend in a direction that brings them closer to each other in the circumferential direction.

10. The first conductor includes a conductor and an insulating layer covering the outside of the conductor. A first opening is provided at one end of the insulating layer, and the conductor includes the first pin protruding from the first opening. The stator according to claim 1, wherein the first opening has a first edge close to the outer wall and a second edge away from the outer wall, and in the direction in which the first pin extends, the distance between the first edge and the end of the first pin is less than or equal to the distance between the second edge and the end of the first pin.

11. The stator according to claim 10, characterized in that the angle between the plane on which the first opening is located and a virtual plane is between 0° and 30°, the virtual plane is perpendicular to the direction of extension of the first pin and passes through the second edge.

12. The stator winding includes a plurality of coil units arranged in a stack along the axial direction, The stator according to claim 1, characterized in that, of two adjacent coil units, the first and second connecting arms of at least one of the first conductors of one of the coil units are folded back toward the side away from the other coil unit.

13. The stator according to claim 12, characterized in that the minimum pitch of the connection structure between two adjacent coil units in the axial direction is 1 mm or more.

14. The stator according to claim 12, characterized in that, of the two adjacent first conductors along the circumferential direction, the second connecting arm of one of the first conductors passes between the second pin of the other first conductor and the stator core.

15. The stator according to claim 1, characterized in that the second connecting arm is bent at a position corresponding to the relief recess and forms a protrusion that projects toward the stator core.

16. The stator according to claim 1, characterized in that the span between two adjacent insertion portions of at least one of the first conductors is equal to the pole distance.

17. The stator according to claim 1, characterized in that the first conductor has an integrally molded structure.

18. The stator according to claim 1, characterized in that the winding slots are installed on both of the two end faces of the stator core that are aligned with the axial direction of the stator core itself.

19. The stator according to claim 1, characterized in that the direction in which the winding slots extend is inclined with respect to the radial direction of the stator core.

20. The groove surface of the winding slot includes a bottom wall surface and two side wall surfaces connected to the bottom wall surface, the two side wall surfaces are spaced apart along the circumferential direction, and the insertion portion is installed between the two side wall surfaces. One end of the winding slot along the axial direction is provided with a groove facing the bottom wall surface along the axial direction, The stator according to claim 1, characterized in that the size of the groove along the circumferential direction is H1, the pitch of the two side wall surfaces in the circumferential direction is H2, and H1 ≤ H2.

21. The winding slot includes a mounting groove that forms a recess on the side wall surface, The stator according to claim 20, further comprising a stopper member inserted into the mounting groove and for restricting the movement of the insertion portion in the axial direction.

22. A motor comprising a stator according to any one of claims 1 to 21.

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