Motor, stator, and method for manufacturing a stator

Abstract

The present application provides a motor, a stator, and a method for manufacturing a stator. The motor stator includes a stator core and a stator winding. The axial end surface of the stator core is provided with a plurality of winding slots extending radially through the inner and outer walls of the stator core, the plurality of winding slots being spaced apart along the circumferential direction of the stator core. The stator winding includes at least one coil unit, the coil unit including a plurality of first conductors to be assembled, each of the first conductors including at least one insertion portion to be inserted into the winding slot. Because the coil unit is assembled and connected to and molded by the plurality of first conductors, when the stator winding is attached to the stator core, the plurality of first conductors can be connected to each other to form the coil unit before the entire coil unit is attached to the stator core. This simplifies the wiring process, facilitates automated mass production, simplifies the motor structure and assembly steps, and improves motor assembly efficiency.

Description

Technical Field

[0001] This application relates to the field of power devices, and specifically, to motors, stators, and methods for manufacturing stators.

Background Art

[0002] Motors have 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.

[0003] How to simplify the structure of motors and improve the assembly efficiency of motors is an important research direction in the field of motors.

Summary of the Invention

[0004] 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.

[0005] 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 along the radial direction 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 which includes a plurality of first conductors to be assembled, and each first conductor includes at least one insertion part inserted into the winding slot.

[0006] In the above technical proposal, the stator includes a stator core and stator windings, and the coil units of the stator windings are embedded in the winding slots of the stator core. Since the coil units are assembled and connected together by multiple first conductors, when attaching the stator windings to the stator core, the multiple first conductors can be connected together in advance to form the coil units, 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 mass production, further simplifying the motor structure and assembly steps, and improving the motor assembly efficiency. By connecting the multiple first conductors of the coil unit to form a distributed winding, high electromagnetic efficiency can be achieved, spatial harmonics can be reduced, and technical effects such as NVH (Noise, Vibration, and Acoustic Roughness) can be improved.

[0007] In some embodiments, the multiple first conductors of the coil unit are distributed in a staggered manner along the circumferential direction. Each first conductor includes a first insertion portion and a second insertion portion connected to each other, the first and second insertion portions being inserted into different winding slots, and within the same winding slot, the first insertion portion of one first conductor is stacked with the second insertion portion of another first conductor of the coil unit.

[0008] In the above-described technology, the first and second insertion portions of the first conductor are inserted into different winding slots, thereby improving the relative positional stability between the first conductor and the stator core. By stacking the insertion portions of the two first conductors of the coil unit, these two first conductors are stacked and fitted together, thereby improving the relative positional stability between the multiple first conductors in the coil unit. 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.

[0009] In some embodiments, the first and second insertion portions of the same first conductor are arranged circumferentially, and within either one winding 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 winding slot than the second insertion portion of the other first conductor of the coil unit.

[0010] In the above proposed technology, the first insertion portion of each first conductor is positioned closer to the bottom wall of the winding slot within any one of the winding slots, so that multiple first conductors can be arranged in sequence, overlapping and fitted together to form a coil unit having two layers of windings. Furthermore, the first insertion portion of each first conductor is located on one of the winding layers, and the second insertion portion is located on the winding of the other layer. The multiple first conductors are fitted together and stoppered from each other, improving the stability of the relative positions between the multiple first conductors within the coil unit.

[0011] In some embodiments, the span between the first and second insertion points of the same first conductor is equal to the pole distance. The winding structure of the first conductor can be simplified.

[0012] In some embodiments, the stator winding includes a plurality of coil units arranged in a stack along the axial direction of the stator core.

[0013] In the above proposed technology, the amount of magnetic flux in the stator can be improved by installing multiple coil units.

[0014] In some embodiments, the first and second insertion portions of the same first conductor are arranged circumferentially, and the first conductor further includes a connecting portion that connects the first and second insertion portions.

[0015] In the above proposed technology, the first insertion part and the second insertion part can be connected via the connecting part at the end of the curl clip.

[0016] In some embodiments, the connection points are located on the side of the first and second insertion points that faces the center of the stator core. Placing the connection points inside the stator core reduces the amount of welding required for multiple conductors inside the stator core, thereby lowering the process difficulty.

[0017] In some embodiments, the connection includes a first connection portion and a second connection portion, the first connection portion extending from the end of the first insertion portion near the center of the stator core and being installed bent diagonally toward the second insertion portion, the second connection portion extending from the end of the second insertion portion near the center of the stator core and being installed bent diagonally toward the first insertion portion, and the first connection portion is connected to the second connection portion.

[0018] In the above proposed technology, the first and second connecting portions are extended and molded along directions that are close to each other, thereby reducing the overall size of the connecting portion and the space occupied by the connecting portion within the center of the stator core.

[0019] In some embodiments, the connection portion further includes a bent portion that connects a first connection portion and a second connection portion.

[0020] In the above proposed technology, by installing a bent section, the axial distance between the first and second insertion sections can be changed, it is possible to install the first and second insertion sections on different winding layers, and the problem of cramped space in the center of the stator core can be improved. Furthermore, the risk of interference between different conductors when the first and second insertion sections cross layers and the risk of damage to the insulating coating of the conductors can be reduced.

[0021] In some embodiments, the first conductor is a one-piece molded structure.

[0022] In the above proposed technology, the first conductor, which is integrally molded, has relatively high structural strength, and the service life of the first conductor can be improved.

[0023] In some embodiments, the first conductor further includes a first pin and a second pin. The first pin is connected to an end departing from the connection portion of the first insertion portion, and the second pin is connected to an end departing from the connection portion of the second insertion portion. The coil unit includes a plurality of conductive branches including a plurality of first conductors connected in series. Among any two adjacent first conductors in the conductive branch, the first pin of one first conductor is connected to the second pin of another first conductor.

[0024] In the above technical solution, by further drawing out the first pin and the second pin on the first conductor, the first conductor can be connected to other first conductors via the first pin and the second pin. At least two first conductors in the conductive branch are connected to each other by the first pin and the second pin and are connected in series to form a conductive branch.

[0025] In some embodiments, among any two adjacent first conductors in the conductive branch, the first pin of one first conductor is axially overlapped and connected with the second pin of another first conductor. This can improve the contact area between the first pin and the second pin, ensure the stability of the relative position between the first pin and the second pin, and improve the current passing amount between the first pin and the second pin.

[0026] In some embodiments, the first pin and the second pin are welded to each other in the overlapping region. [[ID= / / ID=13]]

[0027] In the above technical solution, by welding in the overlapping region of the first pin and the second pin, the stability of the relative position between the first pin and the second pin can be improved, and the welding operation can be facilitated.

[0028] In some embodiments, the region where the first pin and the second pin are axially overlapped and connected constitutes a connection structure, and the coil unit includes a plurality of connection structures arranged at intervals along the circumferential direction.

[0029] In the above technical solution, a plurality of connection structures are spaced apart along the circumferential direction, and there is a gap between adjacent connection structures. 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 improved.

[0030] In some embodiments, the stator winding includes a plurality of coil units, the plurality of coil units are stacked and arranged along the axial direction, and the connection structures of two adjacent coil units are offset in the circumferential direction.

[0031] In the above technical solution, 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 improved. And when the coil unit is inserted into the winding slot, since the distance between the connection structures of different coil units is sufficiently far, it is not necessary to continuously perform flare deformation processing on the first pin and the second pin in the connection structure, the complexity of the process can be reduced, the stability of the positions of the first pin and the second pin can be further guaranteed without the need for flare deformation processing, the risk of welding cracks can be reduced, while the electrical gap between the connection structures can be further increased, and the safety performance of the stator can be improved.

[0032] In some embodiments, the first conductor further includes a first connection arm and a second connection arm. The first insertion part and the first pin are connected via the first connection arm, and the second pin and the second insertion part are connected via the second connection arm. Among two adjacent first conductors along the circumferential direction, the second connection arm of one first conductor passes between the second pin of another first conductor and the stator core.

[0033] In the above proposed technology, the position of the first pin can be adjusted by controlling the shape and size of the first connecting arm, and the position of the second pin can be adjusted by controlling the shape and size of the second connecting arm, thereby allowing the first and second pins to be positioned appropriately. The second connecting arm of one first conductor passes between the second pin of another first conductor and the stator core, that is, the second pin of another first conductor is located on the side of the second connecting arm away from the center of the stator core, that is, the second pin is located outside the second connecting arm of the other conductor. When the first and second pins are welded together, the impact of high temperatures during welding on other components of the conductor is reduced, and the welding operation for the first and second pins is made easier.

[0034] 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.

[0035] In the above proposed technology, by providing a relief recess in the second connecting arm, the position can be given way to the second pin, avoiding the stacking of the second pin and the second connecting arm of the other first conductors, and thus reducing the axial thickness of the coil unit. By providing the relief recess, the height of the end of the stator winding can be made as low as possible, resulting in a relatively small size for the outer envelope of the stator, a smaller motor size, and easier motor placement. Furthermore, by providing the 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 position and, in turn, affecting the welding strength.

[0036] 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.

[0037] In the above embodiment, by providing a protrusion corresponding to the relief recess, the second connecting arm can be formed by a bending process, thereby simplifying the molding process of the second connecting arm.

[0038] In some embodiments, the first and second pins are formed by extending radially away from the center of the stator core, or the first and second pins, which overlap each other, are formed by extending circumferentially towards each other.

[0039] In the above embodiment, if the first pin and the second pin are formed by extending along a direction away from the center of the stator core in the radial direction, the pitch between the first pin, the second pin and parts such as the first insertion part can be increased, and if the first pin and the second pin, which are installed in overlapping positions, are welded to each other, the impact of high temperatures on other parts can be reduced. If the first pin and the second pin, which overlap each other, are formed by extending along a direction closer to each other in the circumferential direction, the shape of the first conductor can be simplified, the size of the first conductor can be reduced, the height of the coil unit away from the end of the stator core can be reduced, the size of the outer envelope of the stator can be reduced, the weight of the first conductor can be reduced, and the placement of the stator can be facilitated.

[0040] In some embodiments, the coil unit further includes a second conductor having a single insertion portion that is inserted into the winding slot. This simplifies the structure of the second conductor and facilitates its manufacture.

[0041] In some embodiments, each first conductor includes one insertion portion, or each first conductor is continuously bent and includes at least three insertion portions, the at least three insertion portions of the first conductor being inserted into different winding slots.

[0042] In the above embodiment, by inserting the three insertion points of the same third conductor into different winding slots, the contact area between the third conductor and the stator core can be improved, and the stability of the relative position between the third conductor and the stator core can be improved.

[0043] In some embodiments, winding slots are provided on both end faces of the stator core that are aligned with its own axial direction.

[0044] In the above embodiment, by providing winding slots on both sides in the axial direction of the stator core, the stator windings can be embedded on different sides of the stator core, and the same stator core can accommodate more coil units.

[0045] In some embodiments, the winding slot includes a bottom wall, two side wall surfaces connected to the bottom wall, and two inclined surfaces, each connected to the two side wall surfaces, the two side wall surfaces being spaced apart along the circumferential direction, and the two inclined surfaces being away from grooves formed between the ends of the corresponding side wall surfaces.

[0046] In the above embodiment, by connecting a slope to the side wall surface, the size of the groove can be increased, making it easier to embed the coil unit in the winding slot.

[0047] In some embodiments, the size of the groove along the circumferential direction is H1, the circumferential pitch of the two side wall surfaces is H2, and H1 ≥ 1.5H2.

[0048] In the above proposed technology, the circumferential extension size of the groove is relatively large and greater than 1.5 times the circumferential pitch of the two side walls, which facilitates the insertion of the coil unit into the winding slot, improves the efficiency of assembling the coil unit into the winding slot, significantly reduces the reserved space and conductor gap in the stator winding assembly, and enables the achievement of a copper filling factor of 75% or more.

[0049] According to a second aspect, an embodiment of the present application provides a motor including a stator of any one embodiment of the first aspect.

[0050] According to a third aspect, the embodiments of this application further 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 in the radial direction, and the plurality of winding slots are spaced apart 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 along the circumferential direction.

[0051] 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.

[0052] In some embodiments, a coil unit pre-assembled by a plurality of first conductors is press-fitted into a plurality of winding slots along the circumferential direction, before the step of inserting the insertion portion of each first conductor 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 two insertion portions that are spaced apart.

[0053] In the above proposed technology, the 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.

[0054] In some embodiments, the number of stator poles is 2p, and the stator pole distance is n winding slots. The method further includes the step of providing 2p·n first conductors, prior to the step of inserting the insertion portion of each first conductor into the winding slots by press-fitting a coil unit, which is pre-assembled by a plurality of first conductors, into a plurality of winding slots along the circumferential direction, wherein each first conductor includes 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. The step of pre-assembling multiple first conductors into a coil unit is: A step of providing a device mechanism, wherein the assembly mechanism includes 2p·n slots evenly arranged along the circumferential direction of the assembly mechanism, The steps include stacking (2p-1)·n first conductors sequentially in 2p·n slots 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.

[0055] In the above proposed technology, since the span between the first insertion part and the second insertion part is equal to the pole distance, the winding structure of the first conductor can be simplified. Within either one winding slot, the first insertion parts of the first conductor are positioned 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. Furthermore, the first insertion part of the first conductor is located in one of the winding layers, and the second insertion part is located in the winding layer of the other, so that the multiple first conductors are fitted together and stoppered from each other, improving the stability of the relative positions between the multiple first conductors within the coil unit. [Brief explanation of the drawing]

[0056] 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 the structure of a motor stator according to some embodiments of this application. [Figure 2] This is a schematic diagram of the structure of the stator winding of a stator according to several embodiments of this application. [Figure 3] 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 4] This is a schematic diagram of the stator assembly process according to several embodiments of this application. [Figure 5] This is a schematic diagram of the structure in the stator assembly process according to some embodiments of this application. [Figure 6] This is a schematic diagram of the stator from a different perspective, according to some embodiments of this application. [Figure 7] This is a schematic diagram of the stator from another perspective, according to some embodiments of this application. [Figure 8] Figure 7 is a schematic diagram of the localized structure at A. [Figure 9] 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 10] 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 11] This is a schematic diagram of the structure of a first conductive part of a stator according to some other embodiments of the present application. [Figure 12] This is a schematic diagram of the local structure of a stator coil unit according to several embodiments of this application. [Figure 13] This is a schematic diagram of the structure of the first conductor of a stator according to some other embodiments of this application. [Figure 14]This is a schematic diagram of the structure from a different perspective, as shown in Figure 13. [Figure 15] Figure 13 is a schematic diagram of the structure of a part of the first conductor of the stator. [Figure 16] This is a schematic diagram of the structure of the first conductor of a stator according to some other embodiments of this application. [Figure 17] This is a schematic diagram of the structure from a different perspective, as shown in Figure 16. [Figure 18] Figure 16 is a schematic diagram of the structure of a part of the first conductor of the stator. [Figure 19] This is a schematic diagram of the structure of the second conductor of the stator according to some embodiments of this application. [Figure 20] This is a schematic diagram of the structure of the first conductor of a stator according to some further embodiments of the present application. [Figure 21] Figure 14 is a schematic diagram of the structure of a stator including a first conductor according to some embodiments of this application. [Figure 22] This is a schematic diagram of the stator core of a stator according to some other embodiments of this application. [Figure 23] This is a schematic diagram of a stator according to some other embodiments of this application. [Figure 24] This is a side view of a stator according to some other embodiments of this application. [Figure 25] This is a local cross-sectional view of the stator core of a stator according to several embodiments of this application. [Figure 26] This is a flowchart showing a method for manufacturing a stator according to some embodiments of this application.

[0057] The drawings are not depicted to actual scale. [Modes for carrying out the invention]

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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, or B alone. In this application, the character " / " generally indicates that the preceding and succeeding related objects are in an "or" relationship.

[0063] 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.

[0064] The term "multiple" as it appears in this application refers to two or more (including two).

[0065] 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.

[0066] 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.

[0067] For the sake of understanding, the following interpretation and explanation will be given to the technical terms appearing in this application.

[0068] Stator: In a motor, this is the stationary, immobile part, and its function is to generate a rotating magnetic field.

[0069] Rotor: A rotating component in a motor, whose function is to convert electrical energy into mechanical energy.

[0070] Span: This is the distance that the sides of two identical elements in a motor winding cross across the armature surface, and is generally expressed by the number of winding slots drilled in the stator core.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] Figure 1 is a schematic diagram of one structure of a stator according to some embodiments of this application, Figure 2 is a schematic diagram of the structure of the stator winding 200 of the stator according to some embodiments of this application, and Figure 3 is a schematic diagram of the structure of the first conductor 210 of the stator winding 200 of the stator according to some embodiments of this application. Figure 4 is a schematic diagram of the assembly process of the stator according to some embodiments of this application.

[0076] As shown in Figures 1 to 4, 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, penetrating the inner and outer walls of the stator core 100 along the radial direction, 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.

[0077] The winding slot 120 penetrates the stator core 100 radially. Exemplarily, the stator core 100 has an inner wall surface and an outer wall surface, and both ends of the winding slot 120 along the radial direction form openings in the inner wall surface and the outer wall surface, respectively.

[0078] 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.

[0079] 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. The number of coil units 200a may be one or more. For example, there may be multiple coil units 200a, and the multiple coil units 200a may be stacked along the axial direction of the stator core 100.

[0080] 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.

[0081] 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.

[0082] Selectively, the coil unit 200a is placed in the winding slot 120 along the axial direction, and the wiring process is made convenient and efficient by wiring the coil unit 200a along the axial direction.

[0083] 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 mass production, and further simplifying the structure and assembly steps of the motor, thereby improving the assembly efficiency of the motor. The multiple first conductors 210 of the coil unit 200a are connected to form a distributed winding, thereby achieving high electromagnetic efficiency, reducing spatial harmonics, and improving technical effects such as NVH (Noise, Vibration, and Acoustic Roughness).

[0084] Referring to Figures 2 through 5, Figure 5 is a schematic diagram of the structure in the stator assembly process according to some embodiments of this application.

[0085] In some embodiments, as shown in Figures 2 to 5, 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.

[0086] 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 5, adjacent first conductors 210 offset one winding slot 120 along the circumferential direction.

[0087] 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.

[0088] 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. By stacking the first insertion portion of one first conductor 210 with the second insertion portion 212 of another first conductor 210 in the coil unit 200a, these two first conductors 210 are stacked and fitted 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.

[0089] In some embodiments, as shown in Figures 1 to 5, the first insertion portion 211 and the second insertion portion 212 of the same first conductor 210 are arranged circumferentially, and within one of the winding slots 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.

[0090] The circumferential direction may be either clockwise or counterclockwise.

[0091] Selectively, as shown in Figures 4 and 5, 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.

[0092] In the above proposed technology, the first insertion portion 211 of each first conductor 210 is positioned 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. The multiple first conductors 210 are fitted together and stoppered from each other, improving the stability of the relative positions between the multiple first conductors 210 in the coil unit 200a.

[0093] 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.

[0094] In some embodiments, as shown in Figures 4 and 5, the span between the first insertion portion 211 and the second insertion portion 212 of the same 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.

[0095] Figure 6 is a schematic diagram of the stator structure from a different viewpoint according to some embodiments of this application. Figure 7 is a schematic diagram of the stator structure from yet another viewpoint according to some embodiments of this application. Figure 8 is a schematic diagram of the localized structure at A in Figure 7.

[0096] In some embodiments, as shown in Figures 1 to 8, the stator winding 200 includes a plurality of coil units 200a arranged in a stack along the axial direction of the stator core 100.

[0097] In the above proposed technology, the amount of magnetic flux in the stator can be improved by installing multiple coil units 200a.

[0098] 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 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.

[0099] In some embodiments, as shown in Figures 1 to 8, 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] In some embodiments, as shown in Figures 1 to 8, the connection portion 213 includes a first connection portion 213a and a second connection portion 213b, wherein the first connection portion 213a extends from the end of the first insertion portion 211 near the center of the stator core 100 and is installed bent diagonally toward the second insertion portion 212, and the second connection portion 213b extends from the end of the second insertion portion 212 near the center of the stator core 100 and is installed bent diagonally toward the first insertion portion 211, and the first connection portion 213a is connected to the second connection portion 213b.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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. The second connection portion 213b of the first conductor 210 presses the first connection portions 213a of the other multiple first conductors 210 toward the bottom wall of the winding slot 120, and the multiple first conductors 210 are sequentially laminated and fitted together, thereby improving the stability of the relative positions between the multiple first conductors 210.

[0114] Referring to Figures 3 to 11, Figure 9 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 10 is a schematic diagram of the partial structure of the first conductor 210 of the stator according to another embodiment of the present application, and Figure 11 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.

[0115] In some embodiments, as shown in Figures 3 to 11, the connecting portion 213 further includes a bent portion 213c that connects a first connecting portion 213a and a second connecting portion 213b.

[0116] There are various ways in which the bent portion 213c can be installed. As shown in Figures 9 to 11, the bent portion 213c may be formed by the first connecting portion 213a being twisted, folded, or bent relative to the second connecting portion 213b. In other words, the bent portion 213c may have a twisted, folded, or stepped shape.

[0117] 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.

[0118] 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.

[0119] Selectively, the first insertion portion 211, the second insertion portion 212, and the connecting portion 213 are integrally molded structures and exhibit a U-shaped structure, with the first insertion portion 211 and the second insertion portion 212 being the two walls of the U-shaped structure, and the connecting portion 213 being the bottom of the U-shaped structure.

[0120] 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.

[0121] The first insertion portion 211, the second insertion portion 212, and the connecting portion 213, which are selectively integrally molded, are 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 the rectangular conductor. The wound rectangular conductor is leveled and then laser-devarized at the 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 increasing the operational efficiency of the production line.

[0122] In some embodiments, as shown in Figures 3 to 8, 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.

[0123] 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.

[0124] In the above proposed technology, the first conductor 210 is further connected to the first conductor 210 by having a first pin 214 and a second pin 215 drawn out, so that the first conductor 210 can 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.

[0125] In some embodiments, as shown in Figures 3 to 8, the first pin 214 of one of the 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 positions of 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] In some embodiments, automatic welding identification can be achieved during welding by rotating the stator axially or the welding head, and welding can be performed as single-point or multi-point simultaneous welding, resulting in high production efficiency. The positional accuracy of the welded portion of the pre-molded 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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 to continuously perform flare deformation on 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, and reduces the risk of welding cracks. Moreover, it increases the electrical clearance between the connecting structures 2145, improving the safety performance of the stator.

[0135] The above technical proposal can further shorten the stator axial size, making the motor's axial size smaller and lighter, reducing the unsprung mass in the finished vehicle, improving chassis maneuverability by arranging multiple links and dummy springs, increasing the electrical gap between the two adjacent coil units 200a connection structures 2145 by offsetting them circumferentially, reducing the insulation requirements for the connection structures 2145, lowering process complexity, saving raw materials, and increasing production line cycle time.

[0136] 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.

[0137] By selectively stacking the connecting structures 2145 of the coil units 200a located on both axial sides of the same coil unit 200a along the axial direction, the circumferential pitch between the connecting structures 2145 of two adjacent coil units 200a can be made as large as possible.

[0138] 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 a 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 spaced apart 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.

[0139] Selectively, the multiple connection structures 2145 of each coil unit 200a are evenly distributed along the circumferential direction, increasing the pitch between the contact portions of two adjacent coil units 200a.

[0140] In some embodiments, as shown in Figures 3 to 8, 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, and 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.

[0141] 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 form a substantially U-shaped structure, where the first insertion portion 211 is one wall of the U-shaped structure and the second insertion portion 212 is another wall 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.

[0142] Selectively, the first connecting arm 216 and the second connecting arm 217 are located outside the stator core 100.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] Referring to Figures 3 to 12, Figure 12 is a schematic diagram of the local structure of a stator coil unit 200a according to some embodiments of this application.

[0148] In some embodiments, as shown in Figures 3 to 12, 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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, a relief portion is provided on the side of the first connecting arm 216 away from the stator core 100 to accommodate the first pin 214 of the other first conductor 210.

[0153] In some embodiments, as shown in Figure 12, 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.

[0154] 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.

[0155] In some embodiments, as shown in Figure 3, the first pin 214 and the second pin 215 are formed to extend radially along a direction away from the center of the stator core 100.

[0156] 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.

[0157] In some other embodiments, as shown in Figures 13 to 18, 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.

[0158] When the first pin 214 and the second pin 215 overlap each other and are formed to extend in a direction that is close to each other in the circumferential direction, 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, selectively, as shown in Figures 13 to 15, 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.

[0159] Referring to Figure 19, Figure 19 is a schematic diagram of the structure of the first conductor 210 of the stator according to some embodiments of the present application.

[0160] As shown in Figure 19, 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.

[0161] 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.

[0162] Referring to Figures 20 and 21, Figure 2 Figure 0 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 21 is a schematic diagram of the structure of the stator including the first conductor 210 shown in Figure 20.

[0163] In some embodiments, as shown in Figures 20 and 21, 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.

[0164] In the above embodiment, by inserting the three 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.

[0165] Selectively, the first conductor 210 may include eight insertion portions 2011.

[0166] The embodiments of this application can employ combinations of different types of first conductors 210 and second conductors 220, thereby reducing the number of pre-molded distributed coil units 200a, lowering process complexity, and minimizing mold input costs.

[0167] In some embodiments, as shown in Figures 22 to 24, winding slots 120 are provided on both end faces 110 of the stator core 100 that are aligned with the axial direction of the core itself.

[0168] In the above embodiment, by installing winding slots 120 on both axial sides of the stator core 100, 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.

[0169] In some embodiments, the first insertion portion 211 and the second insertion portion 212 of the same first conductor 210 are installed symmetrically.

[0170] If the first conductor 210 selectively includes a first pin 214 and a second pin 215, the first pin 214 and first insertion portion 211 and the second pin 215 and second insertion portion 212 of the same first conductor 210 are arranged symmetrically.

[0171] If the first conductor 210 selectively includes a first pin 214, a first connecting arm 216, a second pin 215, and a second connecting arm 217, then the first pin 214, the first connecting arm 216, and the first insertion portion 211 of the same first conductor 210, and the second pin 215, the second connecting arm 217, and the second insertion portion 212 are installed symmetrically.

[0172] In the above proposed technology, the symmetrically installed first insertion portion 211 and second insertion portion 212 balance the force bearing of the first conductor 210, thereby further stabilizing the position between the multiple first conductors 210 that are inserted and fitted together.

[0173] In some embodiments, winding slots 120 are provided on both of the two end faces 110 of the stator core 100 that are aligned with its own axial direction.

[0174] In the above embodiment, by installing winding slots 120 on both axial sides of the stator core 100, 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.

[0175] In some embodiments, as shown in Figure 25, 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 connected to each of the two side wall surfaces 122, the two side wall surfaces 122 being spaced apart along the circumferential direction, and grooves 124 are formed between the ends of the two inclined surfaces 123 that are away from the corresponding side wall surfaces 122.

[0176] In the above embodiment, by connecting the slope 123 to the side wall surface 122, the size of the groove 124 can be increased, making it easier to embed the coil unit 200a in the winding slot 120.

[0177] In some embodiments, the size of the groove 124 along the circumferential direction is H1, the circumferential pitch of the two side wall surfaces 122 is H2, and H1 ≥ 1.5H2.

[0178] In the above proposed technology, the circumferential extension size of the groove 124 is relatively large and greater than 1.5 times the circumferential pitch of the two side wall surfaces 122, which facilitates the insertion of the coil unit 200a into the winding slot 120, improves the efficiency of assembling the coil unit 200a into the winding slot 120, significantly reduces the assembly reservation space and conductor gap of the stator winding 200, and enables the achievement of a copper filling factor of 75% or more.

[0179] 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.

[0180] 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., in the process of installing the coil unit 200a in the winding slots 120, one first conductor 210 is stacked in the winding slots 120 up to 42 each time, and the entire 43rd to 48th conductors are inserted from the grooves 124 of the winding slots 120 until they are bonded to the first conductors 210 located in the winding slots 120, using a robotic hand clamping method. After one coil unit 200a is wired, the second and third coil units 200a are wired in sequence.

[0181] The stator core 100 can be selected to be wound and formed, improving the problem of waste of scraps and intermediate cylindrical material in conventional processes. Only the portion corresponding to the winding slots 120 remains in the scrap, i.e., it is a portion of the material removed to form the winding slots 120, thus improving material utilization. Furthermore, the stator core 100 forming process is simple, making automation easier. Selectively, the stator core 100 can be die-cast from composite materials such as high-permeability, low-loss sheet-type molded plastic, simplifying the forming of the stator core 100 and the heat treatment process. Selectively, the stator core 100 can be further assembled using a segmented core, resulting in relatively high size and precision of the stator core 100, stable quality, high production efficiency, high material utilization, and reduced material costs.

[0182] Selectively, the stator core 100 may have either single-sided or double-sided slots, i.e., winding slots 120 are installed on one or both sides in the axial direction of the stator core 100. This allows the coil unit 200a to have single-sided or double-sided wiring. The single-sided slot wiring method of the stator core 100 has a yoke section that facilitates the mounting and fixing of the stator, while the double-sided slot wiring method of the stator core 100 has technological advantages such as improved material utilization, motor efficiency, and power density, as well as reduced weight and volume.

[0183] The stator of the embodiment of this application can be applied to motors with different numbers of phases and can fit different voltage and power ranges.

[0184] 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.

[0185] Each phase winding may contain only one branch or multiple branches. These phase winding branches may also be called parallel branch connections.

[0186] 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.

[0187] In some embodiments, the stator winding 200 may be connected to a full-distance winding, a short-distance winding, or a multi-layer winding.

[0188] 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.

[0189] 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.

[0190] The motor in the embodiment of this application may be a generator or an electric motor.

[0191] 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.

[0192] 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 electrical energy, for example. Here, 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.

[0193] Referring to Figure 26, an embodiment of the present application further provides a method for manufacturing a stator, which includes the following steps:

[0194] Step S01: A stator core is provided, the end face of the stator core along its own axial direction is provided with a plurality of winding slots, the plurality of winding slots are spaced apart along the circumferential direction of the stator core, and each winding slot extends along the radial direction of the stator core.

[0195] Step S02: The coil unit, which is pre-assembled by multiple first conductors, is pressed into multiple winding slots along the circumferential direction, First Insert the conductive part into the winding slot.

[0196] 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.

[0197] 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 that includes two insertion portions that are spaced apart.

[0198] 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.

[0199] 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, wherein the span between the first insertion portion and the second insertion portion is n winding slots.

[0200] The step of pre-assembling multiple first conductors into a coil unit is: A step of providing a device mechanism, wherein the assembly mechanism includes 2p·n slots evenly arranged along the circumferential direction of the assembly mechanism, The steps include stacking (2p-1)·n first conductors sequentially in 2p·n slots 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.

[0201] Some embodiments further include the following steps.

[0202] The pre-assembled coil unit is removed from the device 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 either one winding slot, the first insertion parts of the first conductors are positioned closer to the bottom wall of the winding slot, allowing multiple first conductors to be arranged in sequence, overlapping and fitted together to form a coil unit with two layers of windings. The first insertion part of each first conductor is located on one of the winding layers, and the second insertion part is located on the other winding layer. The multiple first conductors are fitted together and stoppered from each other, improving the stability of the relative positions between the multiple first conductors within the coil unit.

[0203] According to some embodiments of this application, referring to Figures 1 to 14 and 25, the stator includes a stator core 100 and a stator winding 200, wherein a plurality of winding slots 120 are provided on the end face 110 of the stator core 100 along its own axial direction, spaced apart along the circumferential direction of the stator core 100, each winding slot 120 extends along the radial direction of the stator core 100, and the stator winding 200 includes at least one coil unit 200a, the coil unit 200a includes a plurality of first conductors 210 to which a first insertion portion 211 and a second insertion portion 212 are provided along the circumferential direction, each first conductor 2 10It includes a first insertion portion 211 and a second insertion portion 212, which are inserted into different winding slots 120. 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 the other first conductor 210 of the coil unit 200a that is closer to the bottom wall of the winding slot 120. The first conductor 210 further includes a connector portion 213 that connects the first insertion portion 211 and the second insertion portion 212. The connector portion 213 is located on the side of the first insertion portion 211 and the second insertion portion 212 that is toward the center of the stator core 100. The connecting portion 213 includes a first connecting portion 213a, a second connecting portion 213b, and a bent portion 213c connecting the first connecting portion 213a and the second connecting portion 213b. The first connecting portion 213a extends from the end of the first insertion portion 211 closest to the center of the stator core 100 and is installed bent diagonally toward the second insertion portion 212. The second connecting portion 213b extends from the end of the second insertion portion 212 closest to the center of the stator core 100 and is installed bent diagonally toward the first insertion portion 211. The first conductor 210 has an integrally molded structure. 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. 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 the two adjacent first conductors 210 of the conductive branch 201 is connected to the second pin 215 of the other first conductor 210. The first pin 214 of one of the two adjacent first conductors 210 of the conductive branch 201 and the second pin 215 of the other first conductor 210 are connected overlapping along the axial direction. In the regions where the first pin 214 and the second pin 215 overlap each other along the axial direction, a connecting structure 2145 is formed, and the coil unit 200a includes a plurality of connecting structures 2145 that are spaced apart along the circumferential direction.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. The first conductor 210 further includes a first connecting arm 216 and a second connecting arm 217, the first insertion portion 211 and the first pin 214 are connected via the first connecting arm 216, the second pin 215 and the second insertion portion 212 are connected via the second connecting arm 217, and of two circumferentially adjacent first conductors 210, 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. On the side of the second connecting arm 217 away from the stator core 100, there is a relief recess 217a to accommodate the second pin 215 of the other first conductor 210. Winding slots 120 are provided on both of the two end faces 110 of the stator core 100 that are aligned with the axial direction of the core itself. The winding slots 120 include a bottom wall 121, two side wall 122 connected to the bottom wall 121, and two inclined surfaces 123 each connected to the two side wall 122, the two side wall 122 being spaced apart along the circumferential direction, and grooves 124 are formed between the ends of the two inclined surfaces 123 that are away from the corresponding side wall 122. The winding slots 120 include a bottom wall 121, two side wall 122 connected to the bottom wall 121, and two inclined surfaces 123 each connected to the two side wall 122, the two side wall 122 being spaced apart along the circumferential direction, and grooves 124 are formed between the ends of the two inclined surfaces 123 that are away from the corresponding side wall 122.

[0204] 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.

[0205] 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]

[0206] 100, stator core, 110, end face, 120, winding slot, 121, bottom wall, 122, side wall, 123, slope, 124, groove, 200, stator winding, 200a, coil unit, 201, conductive branch, 2011, insertion part, 210, first conductor, 211, first insertion part, 212, second insertion part, 213, connection part, 213a, first connection part, 213b, second connection part, 213c, bend, 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, 220, second conductor, 221, connection part.

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 and outer walls of the stator core in the radial direction, and the plurality of winding slots are spaced apart 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, The plurality of first conductors of the coil unit are distributed in a staggered manner along the circumferential direction. A stator in which each of the first conductors includes a first insertion portion and a second insertion portion connected to each other, the first insertion portion and the second insertion portion are each inserted into different winding slots, and within the same winding slot, the first insertion portion of one of the first conductors is stacked with the second insertion portion of another of the first conductors of the same coil unit.

2. The first insertion portion and the second insertion portion of the same first conductor are arranged along the circumferential direction. The stator according to claim 1, wherein within any one of the winding slots, the first insertion portion of the first conductor of one of the coil units is located on the side of the second insertion portion of another first conductor of the coil unit that is closer to the bottom wall of the winding slot.

3. The stator according to claim 1, wherein the span between the first insertion portion and the second insertion portion of the same first conductor is equal to the pole distance.

4. The stator according to any one of claims 1 to 3, wherein the stator winding includes a plurality of coil units arranged in a stack along the axial direction of the stator core.

5. The first insertion portion and the second insertion portion of the same first conductor are arranged along the circumferential direction. The stator according to claim 1, wherein the first conductor further includes a connecting portion that connects the first insertion portion and the second insertion portion.

6. The stator according to claim 5, wherein the connecting portion is located on the side of the first insertion portion and the second insertion portion toward the center of the stator core.

7. The connection portion includes a first connection portion and a second connection portion, wherein the first connection portion extends from the end of the first insertion portion closest to the center of the stator core and is installed bent diagonally toward the second insertion portion, and the second connection portion extends from the end of the second insertion portion closest to the center of the stator core and is installed bent diagonally toward the first insertion portion. The stator according to claim 5, wherein the first connection portion is connected to the second connection portion.

8. The stator according to claim 7, wherein the connecting portion further includes a bent portion that connects the first connecting portion and the second connecting portion.

9. The stator according to claim 7, wherein the first conductor is an integrally molded structure.

10. The first conductor further includes a first pin and a second pin, the first pin being connected to the end of the first insertion portion away from the connecting portion, and the second pin being connected to the end of the second insertion portion away from the connecting portion. The stator according to claim 5, wherein the coil unit includes a plurality of conductive branches, each containing a plurality of first conductors connected in series, and the first pin of one of the two adjacent first conductors of the conductive branch is connected to the second pin of the other first conductor.

11. The stator according to claim 10, wherein, of any two adjacent first conductors of the conductive branch, the first pin of one first conductor and the second pin of the other first conductor are connected in an overlapping manner along the axial direction.

12. The stator according to claim 11, wherein the first pin and the second pin are welded to each other in an overlapping region.

13. The first pin and the second pin are connected in an overlapping region along the axial direction, and the region where they are connected constitutes a connection structure. The stator according to claim 11, wherein the coil unit includes a plurality of connection structures installed at intervals along the circumferential direction.

14. The stator winding includes a plurality of coil units stacked along the axial direction, The stator according to claim 13, wherein the connection structure of two adjacent coil units is offset in the circumferential direction.

15. The first conductor further includes a first connecting arm and a second connecting arm, wherein the first insertion portion and the first pin are connected via the first connecting arm, and the second pin and the second insertion portion are connected via the second connecting arm. The stator according to claim 10, wherein, of 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.

16. The stator according to claim 15, wherein the side of the second connecting arm away from the stator core is provided with a relief recess for accommodating the second pin of another first conductor.

17. The stator according to claim 16, wherein the second connecting arm is bent at a position corresponding to the relief recess and forms a protrusion that projects toward the stator core.

18. The first pin and the second pin are formed to extend radially along a direction away from the center of the stator core. Alternatively, the stator according to claim 10, wherein the first pin and the second pin, which overlap each other, are molded to extend in directions that are close to each other in the circumferential direction.

19. The stator according to claim 1, wherein the coil unit further includes a second conductor having an insertion portion that is inserted into the winding slot.

20. Each of the first conductors includes one of the insertion portions, or The stator according to claim 1, wherein each of the first conductors is continuously bent and includes at least three of the insertion portions, and at least three of the insertion portions of the first conductors are each inserted into different winding slots.

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

22. The winding slot includes a bottom wall surface, two side wall surfaces connected to the bottom wall surface, and two inclined surfaces, each connected to the two side wall surfaces. The stator according to claim 1, wherein the two side wall surfaces are spaced apart along the circumferential direction, and the two slopes are separated from grooves formed between the ends of the corresponding side wall surfaces.

23. The stator according to claim 22, wherein the size of the groove along the circumferential direction is H1, the circumferential pitch of the two side wall surfaces is H2, and H1 ≥ 1.5H2.

24. A motor comprising a stator according to any one of claims 1 to 3.

25. A method for manufacturing a stator according to Claim 1, 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 in the radial direction, and the plurality of winding slots are installed at intervals along the circumferential direction of the stator core, A method for manufacturing a stator, comprising the step of inserting the insertion portion of each first conductor into the winding slots by press-fitting a coil unit, which is pre-assembled by a plurality of first conductors, into the plurality of winding slots along the circumferential direction.

26. By press-fitting a coil unit, pre-assembled by a plurality of first conductors, into the plurality of winding slots along the circumferential direction, before arranging the insertion portion of each first conductor 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 manufacturing method according to claim 25, further comprising the step of bending the conductor to form the first conductor including two insertion portions that are spaced apart.

27. The number of poles of the stator is 2p, and the pole distance of the stator is the number of winding slots n. The process further includes the step of providing 2p・n first conductors before inserting the insertion portion of each first conductor into the winding slots, by press-fitting a coil unit, which is pre-assembled by a plurality of first conductors, into the plurality of winding slots along the circumferential direction, wherein each first conductor includes a first insertion portion and a second insertion portion, and the span between the first insertion portion and the second insertion portion is the n winding slots. The above step of pre-assembling the plurality of first conductors into a coil unit is, The steps include providing a device mechanism that includes 2p·n slots evenly arranged along the circumferential direction of the assembly mechanism, The steps include stacking (2p-1) n of the first conductive materials sequentially in the 2p n slots opened along a counterclockwise direction, The manufacturing method according to claim 25 or 26, comprising the step of inserting the remaining n first conductors into the slots of the assembly mechanism to form a coil unit, the step of positioning within any one of the slots such that the first insertion portion of one of the first conductors of the coil unit is located on the side of the slot closest to the bottom wall of the slot of the second insertion portion of another of the first conductors of the coil unit.

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