Electric motor stator, electric motor, driving assembly and vehicle

Abstract

The present disclosure relates to an electric motor stator, an electric motor, a driving assembly and a vehicle. The electric motor stator comprises a stator core and three-phase windings, wherein the stator core comprises a plurality of stator slots, which are evenly distributed in the circumferential direction; every three adjacent stator slots constitute a stator slot group; in the radial direction of the stator iron core, a plurality of wire slots are arranged in each stator slot; the three-phase windings are sequentially alternately wound around different stator slot groups in the circumferential direction of the stator iron core, and the three-phase windings are further sequentially wound around each wire slot layer; and each phase winding of the three-phase windings comprises two branches, each branch being wound in the stator slots of the plurality of stator slot groups, which are arranged at intervals, and the same branch in every two centrally symmetric stator slot groups being wound in the same manner.

Description

Motor stator, motor, drive assembly and vehicle

[0001] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on November 29, 2023, with application number 202311622233.0 and application name “Motor stator, motor, drive assembly and vehicle”, the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0002] The present disclosure relates to the field of motors, and in particular to a motor stator, a motor including the motor stator, a drive assembly including the motor, and a vehicle including the motor. Background Art

[0003] Because flat wire windings in motor stators have a higher slot fill rate than round wire windings, they can reduce copper loss and improve motor efficiency. Consequently, motors with flat wire windings are rapidly gaining popularity in fields like new energy vehicles. To improve winding efficiency, multiple U-shaped wires are often prepared and combined to achieve winding of each branch of the flat wire winding.

[0004] However, in the prior art, since the U-shaped wires of each parallel branch are distributed at different positions of the inner diameter of the stator slot, and the U-shaped wires are provided in various types to match the winding direction, the branch structure is relatively complex, resulting in current circulation in the branch, affecting the reliable operation of the motor stator.

[0005] Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present disclosure aims to provide a motor stator with improved operational reliability, a motor including the motor stator, a drive assembly including the motor, and a vehicle including the motor. Specifically, the present disclosure includes the following technical solutions:

[0007] In a first aspect, an embodiment of the present disclosure provides a motor stator, comprising:

[0008] The stator core is cylindrical and includes:

[0009] An inner wall, wherein a plurality of stator slots are distributed in the circumferential direction of the inner wall, wherein every three adjacent stator slots constitute a stator slot group, and each stator slot corresponds to a stator slot group. In the radial direction of the stator core, a plurality of line slots are arranged in each stator slot, and line slots with the same radius in each stator slot are arranged in the same line slot layer; and

[0010] The three-phase winding is alternately wound around different stator slot groups along the circumference of the stator core. The three-phase winding is also wound around each slot layer in sequence. Each phase winding of the three-phase winding includes two branches. Each branch is wound around the stator slots of multiple stator slot groups that are spaced apart, and the same branch in two centrally symmetrical stator slot groups is wound in the same manner.

[0011] The motor stator of the disclosed invention has multiple stator slots evenly distributed circumferentially on the inner wall of the stator core, allowing the three-phase windings to be alternately wound in different stator slot groups along the circumference of the stator core. Furthermore, by arranging multiple wire slots within the stator slots, and ensuring that wire slots with the same radius are located in the same wire slot layer, the three-phase windings can also be wound sequentially between the wire slot layers, thereby improving the copper fill rate of the stator core.

[0012] The motor stator of the disclosed invention also ensures branch symmetry by winding each branch of each phase winding within multiple stator slot groups spaced apart, with the winding pattern being identical between two centrally symmetrical stator slot groups. This prevents loop currents from being generated due to branch asymmetry, thereby improving the operational reliability of the motor stator of the disclosed invention.

[0013] In one embodiment, both branches have an incoming line end, and the incoming line ends of the two branches are located in two stator slots spaced apart in the same stator slot group and on the same line slot layer, wherein one stator slot is spaced apart from the incoming line ends of the two branches; and / or both branches have an outgoing line end, and the outgoing line ends of the two branches are located in two stator slots spaced apart in another stator slot group and in the same line slot layer, wherein one stator slot is spaced apart from the outgoing line ends of the two branches.

[0014] In this embodiment, the inlet ends of the two branches are arranged in two stator slots spaced apart in the same stator slot group, and the two inlet ends are located on the same slot layer, so as to ensure the winding symmetry of the two branches while reducing the distance between the inlet ends of the two branches, thereby facilitating the parallel connection of the two branches.

[0015] On the other hand, by arranging the outgoing wire ends of the two branches in two stator slots spaced apart in the same stator slot group, and making the two outgoing wire ends located on the same wire slot layer, the spacing between the outgoing wire ends of the two branches is reduced while ensuring the winding symmetry of the two branches, thereby facilitating the parallel connection between the two branches.

[0016] In one embodiment, the incoming end and the outgoing end of each branch are located on two adjacent trunking layers, and the radius of the trunking layer where the incoming end of the branch is located is larger than the radius of the trunking layer where the outgoing end of the branch is located.

[0017] In this embodiment, the incoming wire end of the branch is set on the wire slot layer with a larger radius, and the outgoing wire end of the branch is set on the wire slot layer with a smaller radius, so that when winding the branch, the wire can be wound in sequence from the inside to the outside of the stator slot along the radial direction of the stator core, thereby simplifying the winding process of the branch and improving the winding quality.

[0018] In one embodiment, the branch includes a plurality of U-shaped wires connected in series, each U-shaped wire includes a bent end, and a welded end is formed between two adjacent U-shaped wires, and the bent ends and the welded ends are alternately connected between each stator slot group and alternately connected between each slot layer; wherein the span of the bent end connecting between two adjacent slot layers is a full span; and the span of the welded end connecting between two adjacent slot layers is a full span.

[0019] In this embodiment, a plurality of U-shaped wires are arranged in series, and the bent ends and the welded ends are alternately connected between each stator slot group and each slot layer, and the span between two connected slot layers is made to be a full distance. In this way, when the U-shaped wires are used for radial bridging along the stator core, winding switching between the same phase belts of different stator slot groups but different slot layers is achieved, thereby simplifying the winding process of the branch circuit.

[0020] In one embodiment, the incoming and outgoing terminals of a same branch are located in two adjacent stator slot groups, and the span between the two stator slots corresponding to the incoming and outgoing terminals of the branch is an entire distance.

[0021] In this embodiment, the input and output terminals of the same branch are arranged in two adjacent stator slot groups to prevent contact between the input and output terminals, which could cause a short circuit in the branch. Furthermore, by setting the span between the two stator slots corresponding to the input and output terminals to an even pitch, the winding pattern of the branch forms a loop, thereby ensuring the winding quality of the branch.

[0022] In one embodiment, the trunking layer includes:

[0023] a bottom layer of the trunking, the radius of which is greater than the radius of any of the other trunking layers; and

[0024] The notch layer has a radius smaller than that of any other slot layer;

[0025] Among them, the two branches of the same phase winding include a first branch and a second branch, the span of the bent end of the first branch at the bottom layer of the slot is n and n+2, and the span of the bent end of the first branch at the slot opening layer is n-2 and n-1; the span of the bent end of the second branch at the bottom layer of the slot is n-2 and n, and the span of the bent end of the second branch at the slot opening layer is n+1 and n+2, where the whole distance is n.

[0026] In this embodiment, by setting the span of the bent end of the first branch at the slot bottom layer to n and n+2, and setting the span of the bent end of the first branch at the slot opening layer to n-2 and n-1, winding switching of different phase belts located in different stator slot groups on the same slot layer is achieved, thereby eliminating the angle difference on the first branch and avoiding the formation of circulating current interference between the two branches.

[0027] In one embodiment, the incoming end of each branch is located on the bottom layer of the slot, and the outgoing end of each branch is located on a slot layer adjacent to the bottom layer.

[0028] In this embodiment, when winding a single branch, the wire can be wound along the radial direction of the stator core, starting from the bottom of the stator slot and ultimately extending outward from the slot layer near the slot opening. This simplifies the parallel connection between the two branches while also simplifying the winding process for each branch and improving the winding quality.

[0029] On the other hand, by setting the span of the bent end of the second branch at the bottom slot layer to n-2 and n, and setting the span of the bent end of the second branch at the slot opening layer to n+1 and n+2, the winding switching of different phase belts located in different stator slot groups on the same slot layer can be achieved, thereby eliminating the angle difference on the second branch and avoiding the formation of circulating current interference between the two branches.

[0030] In one embodiment, the incoming and outgoing terminals of each branch of each phase winding are located on the same side of the stator core to facilitate electrical connection between the phase windings.

[0031] In this embodiment, the electrical connection between the phase windings is simplified by arranging the incoming and outgoing terminals of each branch of each phase winding on the same side of the stator core.

[0032] In one embodiment, the incoming terminals of two branches of the same phase winding are electrically connected, and the outgoing terminals of the branches of the three-phase winding are electrically connected to each other.

[0033] In this embodiment, the output terminals of the three-phase windings are electrically connected to each other so that the stator of the motor of the present disclosure adopts a star connection manner.

[0034] In one embodiment, after the incoming terminals of two branches of a same phase winding are electrically connected to each other, they are electrically connected to the outgoing terminals of two branches of another phase winding.

[0035] In this embodiment, the two incoming terminals of a same phase winding are electrically connected to each other and then to the two outgoing terminals of another phase winding, so that the stator of the motor disclosed herein adopts a delta connection manner.

[0036] In a second aspect, an embodiment of the present disclosure provides a motor, comprising:

[0037] the motor rotor; and

[0038] In the motor stator of the first aspect, the motor rotor is located inside the motor stator.

[0039] In a third aspect, an embodiment of the present disclosure provides a drive assembly, comprising:

[0040] reducer; and

[0041] The motor of the second aspect is transmission-connected to the reducer.

[0042] In a fourth aspect, an embodiment of the present disclosure provides a vehicle, comprising:

[0043] wheels; and

[0044] The third aspect is the drive assembly, in which the motor of the drive assembly is connected to the wheels through the reducer of the drive assembly, and is used to drive the wheels to rotate to control the operation of the vehicle.

[0045] It can be understood that the motor, drive assembly and vehicle provided in the second to fourth aspects of the present disclosure all have the effect of improving operational reliability due to the use of the motor stator provided in the first aspect of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] FIG1 is a schematic structural diagram of a motor provided in an embodiment of the present disclosure;

[0047] FIG2 is a schematic structural diagram of a motor stator provided in an embodiment of the present disclosure;

[0048] FIG3 is a schematic structural diagram of a stator core provided in an embodiment of the present disclosure;

[0049] FIG4 is a schematic diagram of a partial structure of a stator core provided in an embodiment of the present disclosure;

[0050] FIG5 is a top view of a stator core provided in one embodiment of the present disclosure;

[0051] FIG6 is a schematic diagram of the winding of a three-phase winding provided in an embodiment of the present disclosure;

[0052] FIG7 is a schematic diagram of the winding of a U-phase winding provided in one embodiment of the present disclosure;

[0053] FIG8 is a schematic diagram of the winding of a V-phase winding provided in one embodiment of the present disclosure;

[0054] FIG9 is a schematic diagram of the winding of a W-phase winding provided in one embodiment of the present disclosure;

[0055] FIG10 is a schematic diagram of the winding of the first branch of the U-phase winding provided in one embodiment of the present disclosure;

[0056] FIG11 is a schematic diagram of the winding of the second branch of the U-phase winding provided in one embodiment of the present disclosure;

[0057] FIG12 is a schematic diagram of the winding of the first branch of the V-phase winding provided in one embodiment of the present disclosure;

[0058] FIG13 is a schematic diagram of the winding of the second branch of the V-phase winding provided in one embodiment of the present disclosure;

[0059] FIG14 is a schematic diagram of the winding of the first branch of the W-phase winding provided in one embodiment of the present disclosure;

[0060] FIG15 is a schematic diagram of the winding of the second branch of the W-phase winding provided in one embodiment of the present disclosure;

[0061] FIG16 is a schematic structural diagram of a U-shaped wire provided in one embodiment of the present disclosure;

[0062] FIG17 is another schematic structural diagram of a U-shaped wire provided in one embodiment of the present disclosure;

[0063] FIG18 is another schematic structural diagram of a U-shaped wire provided in one embodiment of the present disclosure;

[0064] FIG19 is another schematic structural diagram of a U-shaped wire provided in one embodiment of the present disclosure;

[0065] FIG20 is another schematic structural diagram of a U-shaped wire provided in one embodiment of the present disclosure;

[0066] FIG21 is another schematic structural diagram of a U-shaped wire provided in one embodiment of the present disclosure;

[0067] FIG22 is another schematic structural diagram of a U-shaped wire provided in one embodiment of the present disclosure;

[0068] FIG23 is another schematic structural diagram of a U-shaped wire provided in one embodiment of the present disclosure;

[0069] FIG24 is another schematic structural diagram of a U-shaped wire provided in one embodiment of the present disclosure;

[0070] FIG25 is a schematic diagram of the connection of three-phase windings provided in one embodiment of the present disclosure;

[0071] FIG26 is another connection diagram of the three-phase winding provided in one embodiment of the present disclosure;

[0072] FIG27 is a schematic diagram of a vehicle provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0073] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0074] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application include direct and indirect connections (couplings) unless otherwise specified. The directional terms mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0075] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. It should be noted that the terms "first," "second," and so on, in the specification, claims, and accompanying drawings of this application are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "include," "may include," "comprise," or "may include" as used in this application indicate the presence of the corresponding functions, operations, components, etc. disclosed, and do not limit the presence or absence of one or more additional functions, operations, components, etc. Furthermore, the terms "include" or "comprising" indicate the presence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0077] Please refer to FIG. 27 , which is a schematic diagram of a vehicle provided in one embodiment of the present disclosure.

[0078] As shown in FIG27 , the present disclosure provides a vehicle 400 comprising wheels 401 and a drive assembly 300. The drive assembly 300 comprises a motor 200 and a reducer 301. The reducer 301 is connected in a transmission manner between the motor 200 and the wheels 401. The motor 200 drives the wheels 401 to rotate, thereby controlling the operation of the vehicle 400 of the present disclosure. It is understood that in other embodiments, the motor 200 may also be used in other applications requiring power output, and the applicant does not impose any particular limitation on this.

[0079] Please refer to FIG1 , which is a schematic structural diagram of a motor 200 provided in an embodiment of the present disclosure.

[0080] As shown in Figure 1, the motor 200 of the present disclosure includes a motor rotor 201 and a motor stator 100, wherein the motor stator 100 is substantially cylindrical and has a geometric center axis L1. The motor rotor 201 is located inside the motor stator 100 and can rotate around the geometric center axis L1.

[0081] The motor stator 100 is wound with a three-phase winding 20, which, under the action of an external current, forms multiple pairs of magnetic poles (not shown). Under the action of the external current, these magnetic poles form a magnetic field, which enables the motor rotor 201 to rotate about its geometric center axis L1, thereby achieving the power output function of the motor 200 disclosed herein.

[0082] The motor 200 provided in the present disclosure can be used in a vehicle. The motor 200 is housed within the vehicle to provide power for the vehicle. It is understood that the motor 200 disclosed in the present disclosure can also be used in other devices requiring power output, and the applicant does not impose any particular limitation on this.

[0083] Please refer to FIG. 2 , which is a schematic structural diagram of a motor stator 100 provided in an embodiment of the present disclosure.

[0084] As shown in FIG2 , the motor stator 100 includes a stator core 10 and a three-phase winding 20 . The three-phase winding 20 is wound on the motor stator 100 .

[0085] For details, please refer to FIG3 , which is a schematic structural diagram of a stator core 10 provided in an embodiment of the present disclosure.

[0086] As shown in FIG3 , the stator core 10 is generally cylindrical and has an inner wall 11 and an outer wall 12 . The inner wall 11 and the outer wall 12 are both cylindrical, and their geometric center axes are the geometric center axis L1 of the motor stator 100 .

[0087] As shown in Figure 3, the inner wall 11 is provided with a plurality of stator slots 13. These slots are evenly distributed along the circumference of the inner wall 11, dividing the inner wall 11 into multiple equal sections of equal angle. Furthermore, each stator slot 13 extends radially from the stator core 10 toward the outer wall 12 for the same distance. Along the geometric center axis L1, each stator slot 13 extends throughout the stator core 10, facilitating the winding of the three-phase winding 20.

[0088] Please refer to FIG. 4 , which is a schematic diagram of a partial structure of a stator core 10 provided in an embodiment of the present disclosure.

[0089] As shown in FIG4 , a single stator slot 13 includes multiple wire slots 131 . The wire slots 131 are arranged along the radial direction of the stator core 10 . Each wire slot 131 within the same stator slot 13 has a different distance from the geometric center axis L1 . In other words, each wire slot 131 within the same stator slot 13 has a different radius.

[0090] Since the stator slots 13 are evenly distributed along the circumference of the stator core 10, it is understood that each stator slot 13 contains slots 131 having the same radius. As shown in FIG5 , each slot 131 having the same radius is located in the same slot layer 14 a. It is understood that the number of slot layers 14 a is the same as the number of slots 131 in a single stator slot 13.

[0091] As shown in Figure 4 , the number of slots 131 in a single stator slot 13 is six. Therefore, as shown in Figure 5 , the stator core 10 has six slot layers 14a with different radii surrounding the geometric center axis L1. The slot layer 14a with the smallest radius, located closer to the center of the surrounding slot layers 14a, is defined as the slot opening layer 141. The slot layer 14a with the largest radius, located farther from the center of the surrounding slot layers 14a, is defined as the slot bottom layer 142. It will be appreciated that in other embodiments, the number of slot layers 14a may vary depending on the number of slots 131 in a single stator slot 13.

[0092] For the motor stator 100 disclosed in the present invention, the number of poles corresponding to the motor stator 100 disclosed in the present invention is 8. As shown in Figure 5, the stator core 10 includes 72 stator slots 13. This enables the motor stator 100 disclosed in the present invention to adapt to the pole-slot combination of 8 poles and 72 slots. Based on the fact that the motor stator 100 disclosed in the present invention uses a three-phase winding 20 to wind the stator core 10, and the number of slots per pole per phase = number of slots / number of phases / number of poles. It can be understood that the number of slots per pole per phase of the motor stator 100 disclosed in the present invention is 3.

[0093] Therefore, in the circumferential direction of the stator core 10, every three adjacent stator slots 13 can form a stator slot group 14b. Based on the number of stator slots 13 being 72, the corresponding number of stator slot groups 14b is 24. Each stator slot 13 corresponds to only one stator slot group 14b. In other words, there is no situation where a stator slot 13 is located in two stator slot groups 14b at the same time. It is understood that the motor stator 100 of the present disclosure can also be adapted to correspond with other pole slot matching relationships, and the corresponding number of slots per pole and per phase can be adaptively adjusted, and the applicant does not impose any special restrictions on this.

[0094] At the same time, as shown in Figure 4, for a single stator slot group 14b, the three stator slots 13 respectively constitute a first phase belt 15a, a second phase belt 15b and a third phase belt 15c, wherein the first phase belt 15a is relatively close to the W-phase winding 21c, the third phase belt 15c is relatively close to the V-phase winding 21b, and the second phase belt 15b is located between the first phase belt 15a and the third phase belt 15c.

[0095] Please refer to Figure 6, which shows a winding diagram of a three-phase winding 20 provided in one embodiment of the present disclosure. For ease of description, Figure 6 numbers the stator slots 13 in clockwise order 1-72, and separates and extends the two stator slots 13 numbered 57 and 58 to form Figure 6. Furthermore, for ease of description, Figure 6 also horizontally lays out the individual wire slots 131 of each stator slot 13, showing them arranged from left to right within a single stator slot 13, from the slot opening layer 141 to the slot bottom layer 142.

[0096] As shown in Figure 6, for a branch 22 of a single-phase winding 21, the connection between the slot opening layer 141 and the slot bottom layer 142 is used to switch between different phase bands 15. The connection between the slot opening layer 141 and the slot bottom layer 142 is used to switch between the same phase bands 15 in different slot layers 14a.

[0097] As shown in FIG6 , each phase winding 21 of the three-phase winding 20 simultaneously passes through three adjacent stator slot groups 14 b and is wound alternately along the circumference of the stator core 10. That is, two adjacent stator slot groups 14 b around which the same winding 21 is wound are separated by two stator slot groups 14 b, and these two stator slot groups 14 b are respectively wound by the remaining two phase windings 21.

[0098] The three-phase winding 20 includes a U-phase winding 21a, a V-phase winding 21b, and a W-phase winding 21c. Each phase winding 21 is equally divided among all stator slot groups 14b. Given that there are 24 stator slot groups 14b, it is understood that the U-phase winding 21a, the V-phase winding 21b, and the W-phase winding 21c are each wound within eight of the stator slot groups 14b.

[0099] The U-phase winding 21a is wound around the stator slots 13 numbered 1-3, 10-12, 19-21, 28-30, 37-39, 46-48, 55-57, and 64-66 (as shown in FIG7 ). The V-phase winding 21b is wound around the stator slots 13 numbered 4-6, 13-15, 22-24, 31-33, 40-42, 49-51, 58-60, and 67-69 (as shown in FIG8 ). The W-phase winding 21c is wound around the stator slots 13 numbered 7-9, 16-18, 25-27, 34-36, 43-45, 52-54, 61-63, and 70-72 (as shown in FIG9 ).

[0100] It is understood that in this embodiment, the stator slot 13 numbered 1 can be used as a stator slot 13 with other numbers. That is, in the above figure, the stator slot 13 numbered 1 as the starting point can be any stator slot 13 in Figure 3. The applicant does not impose any particular limitation on this.

[0101] On the other hand, as shown in Figures 6-9, each of the U-phase winding 21a, the V-phase winding 21b, and the W-phase winding 21c includes two branches 22, wherein the two branches 22 are respectively a first branch 22a and a second branch 22b. The first branch 22a and the second branch 22b cooperate with each other to realize the winding of the stator slot group 14b corresponding to the U-phase winding 21a, the V-phase winding 21b, and the W-phase winding 21c. Since the number of branches 22 is determined by the power of the motor 200 of the present disclosure, in another embodiment, the number of branches 22 of each phase winding 21 of the stator 100 of the motor of the present disclosure can also be other.

[0102] Specifically, please refer to FIG10 for a schematic diagram of the winding of the first branch 22a of the U-phase winding 21a provided in one embodiment of the present disclosure, and FIG11 for a schematic diagram of the winding of the second branch 22b of the U-phase winding 21a provided in one embodiment of the present disclosure. For ease of description, FIG10 and FIG11 simplify the winding of the two branches 22 shown in FIG7 into a table, and use dotted lines and solid lines to represent the winding relationship between the various slots 131.

[0103] The U-phase winding 21a has two branches 22. As can be appreciated, as shown in Figures 10 and 11, the winding arrangement of the two branches 22 ensures that all stator slots 13 within the eight stator slot groups 14b corresponding to the U-phase winding 21a are wound, and each stator slot 131 has a branch 22 passing through it. This ensures the copper fill rate of the U-phase winding 21a. Furthermore, this ensures the copper fill rate of the three-phase winding 20.

[0104] At the same time, as shown in Figure 10, for the first branch 22a of the U-phase winding 21a, the winding method of the stator slots 13 numbered 1-3 and numbered 37-39 is the same, the winding method of the stator slots 13 numbered 10-12 and numbered 46-48 is the same, the winding method of the stator slots 13 numbered 19-21 and numbered 55-57 is the same, and the winding method of the stator slots 13 numbered 28-30 and numbered 64-66 is the same.

[0105] As shown in Figure 10, the branch 22 enters the line slot 131 numbered f in the line slot layer 14a in the stator slot 13 numbered 1, and exits the line slot 131 numbered e in the line slot layer 14a in the stator slot 13 numbered 10 (for the convenience of description, the slot opening layer 141 is numbered a, the slot bottom layer 142 is numbered f, and the slot opening layer 141 to the slot bottom layer 142 are numbered in sequence from a to f).

[0106] Taking the winding methods of the stator slots 13 numbered 1-3 and the stator slots 13 numbered 37-39 as examples, the winding methods are described as follows:

[0107] In the stator slots 13 numbered 1-3, the first branch 22a of the U-phase winding 21a starts from the slot 131 numbered 1f, and the slots 131 passing through the stator slot group 14b are numbered 1f, 3a, 1b, 3c, 2d, 2c, 1d, and 3e respectively.

[0108] In the stator slots 13 numbered 37-39, the first branch 22a of the U-phase winding 21a starting from the slot 131 numbered 1f enters the slot 131 numbered 39c in the stator slot group 14b, and the slots 131 passing through the stator slot group 14b are numbered 39c, 38d, 38c, 37d, 39e, 37f, 39a, and 37b respectively.

[0109] For stator slots 13 numbered 1-3 and stator slots 13 numbered 37-39, the first branch 22a of the U-phase winding 21a passes through the slots 131 numbered 1f and 1d, as well as the slots 131 numbered 37f and 37d. The first branch 22a of the U-phase winding 21a passes through the slots 131 numbered 2d and 2c, as well as the slots 131 numbered 38d and 38c. The first branch 22a of the U-phase winding 21a passes through the slots 131 numbered 3a, 3c, and 3e, as well as the slots 131 numbered 39a, 39c, and 39e.

[0110] That is, the stator slots 13 numbered 1-3 and the stator slots 13 numbered 37-39 have the same winding method, which means that when the branch 22 passes through the stator slots 13 numbered 1-3 and the stator slots 13 numbered 37-39, the wire slots 131 passed through are consistent, and when passing through the consistent wire slots 131, the winding direction is the same.

[0111] Therefore, for the U-phase winding 21a, among the stator slot groups 14b around which the U-phase winding 21a is wound, every two stator slot groups 14b separated by three stator slot groups 14b have the same winding pattern. Accordingly, there are a total of 11 stator slot groups 14b between two stator slot groups 14b with the same winding pattern. There are a total of 24 stator slot groups 14b. As will be appreciated, the two stator slot groups 14b with the same winding pattern are symmetrical about their centers.

[0112] As can be understood, in FIG11 , the two stator slot groups 14 b having the same winding direction are also centrally symmetrical. Thus, for the U-phase winding 21 a, the winding method of the two centrally symmetrical stator slot groups 14 b around which the U-phase winding 21 a is wound is the same.

[0113] For the same branch 22, if the winding arrangements of two centrally symmetrical stator slot groups 14b are asymmetrical, the branch 22 may be asymmetrical, potentially leading to current circulation within the branch 22. Since the two branches 22 of the same-phase winding 21 are connected in parallel, the presence of current circulation may cause a voltage difference between the first branch 22a and the second branch 22b. This can lead to power imbalance in the motor stator 100, thereby compromising the operational reliability of the motor stator 100.

[0114] Therefore, the motor stator 100 of the present disclosure winds each branch 22 of each phase winding 21 within a plurality of stator slot groups 14 b spaced apart, and ensures that the winding method of two centrally symmetrical stator slot groups 14 b around the same branch 22 is the same, thereby ensuring the symmetry of each branch 22 and preventing loop currents from being generated due to asymmetry of the branches 22. This improves the operational reliability of the motor stator 100 of the present disclosure.

[0115] Meanwhile, the winding pattern of the two branches 22 of V-phase winding 21b is identical to that of U-phase winding 21a to eliminate the potential difference between U-phase winding 21a and V-phase winding 21b. As shown in Figures 10 and 12, the winding pattern of the first branches 22a of U-phase winding 21a and V-phase winding 21b in stator slots 13 numbered 1-3 in Figure 10 of U-phase winding 21a is identical to the winding direction of the first branches 22a of stator slots 13 numbered 13-15 in Figure 12 of V-phase winding 21b.

[0116] Correspondingly, the winding patterns numbered 10-12 in FIG10 are identical to the winding patterns numbered 22-24 in FIG12, the winding patterns numbered 19-21 in FIG10 are identical to the winding patterns numbered 31-33 in FIG12, and the winding patterns numbered 28-30 in FIG10 are identical to the winding patterns numbered 40-42 in FIG12. Furthermore, the first branch 22a shown in FIG12 is also symmetrical.

[0117] As can be understood, as shown in Figures 11 and 13 , the winding methods of the second branch 22b of the V-phase winding 21b and the U-phase winding 21a are also the same. This ensures the winding consistency of the V-phase winding 21b and the U-phase winding 21a, and avoids the potential difference between the V-phase winding 21b and the U-phase winding 21a caused by inconsistent winding.

[0118] At the same time, as shown in Figures 10, 11, 14, and 15, the winding methods of the two branches 22 of the U-phase winding 21a and the W-phase winding 21c are also consistent. This ensures that the winding methods of the U-phase winding 21a, the V-phase winding 21b, and the W-phase winding 21c are identical, thereby ensuring that the potentials of the windings 21 of each phase are consistent. This further improves the operational reliability of the motor stator 100 disclosed herein.

[0119] In one embodiment, both branches 22 have an inlet terminal 221. These terminals 221 are located within the same stator slot group 14b and on the same slot layer 14a. A stator slot 13 separates the inlet terminals 221 of the two branches 22. As shown in Figures 10 and 11, the inlet terminals 221 of the two branches 22 are both located on the slot bottom layer 142, and are located in the stator slots 13 numbered 1 and 3, respectively.

[0120] As can be understood, the inlet terminals 221 of the two branches 22 are spaced apart in different stator slots 13 to ensure winding symmetry of the two branches 22. Furthermore, the inlet terminals 221 of the two branches are disposed in the same stator slot group 14b with one stator slot 13 between them, so as to facilitate electrical connection of the two inlet terminals 221.

[0121] On the other hand, both branches 22 have an outlet terminal 222. These outlet terminals 222 are located within the same stator slot group 14b and on the same slot layer 14a. A stator slot 13 separates the outlet terminals 222 of the two branches 22. As shown in Figures 10 and 11, the outlet terminals 222 of the two branches 22 are located on the slot layer 14a adjacent to the slot bottom layer 142, and are located in stator slots 13 numbered 10 and 12, respectively.

[0122] As will be appreciated, distributing the outlet terminals 222 of the two branches 22 in different stator slots 13 at intervals ensures symmetric winding of the two branches 22. Furthermore, disposing the outlet terminals 222 of the two branches 22 in the same stator slot group 14b, with one stator slot 13 between them, facilitates electrical connection of the two outlet terminals 222. Furthermore, this facilitates parallel connection of the two branches 22 of the U-phase winding 21a.

[0123] At the same time, in this embodiment, the incoming end 221 and the outgoing end 222 of each branch circuit 22 are located on two adjacent wire trough layers 14a, and the radius of the wire trough layer 14a where the incoming end 221 of the branch circuit 22 is located is larger than the radius of the wire trough layer 14a where the outgoing end 222 of the branch circuit 22 is located. As shown in Figures 10 and 11, the incoming end 221 of the two branches 22 is located on the bottom trough layer 142, while the outgoing end 222 of the two branches 22 is located on the wire trough layer 14a adjacent to the bottom trough layer 142.

[0124] It is understood that when winding a single branch 22, the winding can be started from the bottom of the stator slot 13 along the radial direction of the stator core 10 and finally extended outward from the slot layer 14a close to the slot opening. This simplifies the parallel connection between the two branches 22 and also simplifies the winding process of each branch 22, thereby improving the winding quality.

[0125] In one embodiment, referring back to FIG. 2 , each branch 22 includes a plurality of U-shaped wires 23 connected in series, wherein each U-shaped wire 23 includes a bent end 231 , and a welding end 24 is formed between two adjacent U-shaped wires 23 .

[0126] Specifically, please refer to FIG16 , which shows a schematic structural diagram of a U-shaped line 23 provided in an embodiment of the present disclosure, and refer to FIG2 and FIG10 in conjunction therewith.

[0127] As shown in Figure 16, each U-shaped wire 23 includes a bent end 231, a conductor 232, a bent portion 233, and a leg 234. Two conductors 232, two bent portions 233, and two legs 234 are provided. The conductors 232 are straight and extend vertically. The bent end 231 bridges between two conductors 232, providing an electrical connection between them. The end of each conductor 232 facing away from the bent end 231 is electrically connected to the bent portion 233 and the leg 234, respectively.

[0128] As shown in FIG2 , a U-shaped wire 23 is connected across two stator slots 13 in two stator slot groups 14 b, with two conductors 232 passing through the two wire slots 131 of the corresponding stator slots 13. Correspondingly, another U-shaped wire 23 adjacent to the U-shaped wire 23 in the branch 22 is also connected across two other stator slot groups 14 b, with adjacent legs 234 of the two U-shaped wires 23 welded together to form welded ends 24.

[0129] The welding end 24 is composed of two adjacent legs 234 and two bends 233 of two adjacent U-shaped wires 23. It can be understood that the welding end 24 not only realizes the series connection of the two U-shaped wires 23, but also realizes the bridging of two stator slots 13 in two stator slot groups 14b.

[0130] When the full pitch is n, the spans of the first branch 22a at the bent end 231 of the bottom groove layer 142 are n and n+2, and the spans of the first branch 22a at the bent end 231 of the notch layer 141 are n-2 and n-1. The spans of the second branch 22b at the bent end 231 of the bottom groove layer 142 are n-2 and n, and the spans of the second branch 22b at the bent end 231 of the notch layer 141 are n+1 and n+2, where the full pitch is n.

[0131] Specifically, for an 8-pole, 72-slot motor stator 100, the pitch n is 9. Referring back to Figure 10 , for the first branch 22a of the U-phase winding 21a, the solid line in Figure 10 represents the bent end 231 of the U-shaped wire 23, while the dashed line represents the welded end 24 formed between two adjacent U-shaped wires 23. This branch 22 enters the slot 131 numbered f in the slot layer 14a of the stator slot 13 numbered 1, and exits the slot 131 numbered e in the slot layer 14a of the stator slot 13 numbered 10. (For ease of description, the slot opening layer 141 is numbered a, the slot bottom layer 142 is numbered f, and the numbers from slot opening layer 141 to slot bottom layer 142 are sequentially numbered from a to f.)

[0132] The wire grooves 131 that the U-shaped wire 23 in the branch 22 passes through in sequence are 1f-12f, 21e-30d, 39c-48b, 57a-65a, 56b-47c, 38d-29e, 20f-11f, 20e-29d, 38c-47b, 56a-64a, 55b-46c, 37d-28e, 19f-30f, 39e-48d, 57c-66b, 3a-10a, 1 b-64c, 55d-46e, 37f-48f, 57e-66d, 3c-12b, 21a-29a, 20b-11c, 2d-65e, 56f-47f, 56e-65d, 2c-11b, 20a-28a, 19b-10c, 1d-64e, 55f-66f, 3e-12d, 21c-30b, 39a-46a, 37b-28c, 19d-10e.

[0133] It can be seen that in the disclosed embodiment, the first branch 22a is wound around each stator slot group 14b and also wound between different slot layers 14a along the radial direction of the stator core 10. The span of the bent end 231 spanning between two adjacent slot layers 14a is a full distance, and the span of the welded end 24 spanning between two adjacent slot layers 14a is also a full distance.

[0134] Based on the number of full pitches in the embodiment of the present disclosure, 9 are provided. Therefore, the U-shaped line 23 spanning between the wire trough layers 14a numbered b and c can be the U-shaped line 23 shown in FIG16 . For example, 39c-48b can be the U-shaped line 23 shown in FIG16 . The U-shaped line 23 spanning between the wire trough layers 14a numbered d and e can be the U-shaped line 23 shown in FIG17 . For example, 21e-30d can be the U-shaped line 23 shown in FIG17 .

[0135] It can be understood that by setting the span of the U-shaped wire 23 between the wire slot layers 14a between the slot opening layer 141 and the slot bottom layer 142 to a full pitch, the winding switching between the same phase belts 15 of two different stator slot groups 14b can be achieved by using the U-shaped wire 23 to span the radial direction of the stator core 10, thereby simplifying the winding process of the first branch 22a.

[0136] As shown in FIG10 , in the slot layer 141, the spans of the bent ends 231 spanning between the two wire slot layers 14a numbered a are 7 and 8. Accordingly, the U-shaped wire 23 spanning between the two wire slot layers 14a numbered a with a span of 7 can adopt the U-shaped wire 23 shown in FIG18 . For example, 3a-10a and 39a-46a can adopt the U-shaped wire 23 shown in FIG18 . The U-shaped wire 23 spanning between the two wire slot layers 14a numbered a with a span of 8 can adopt the U-shaped wire 23 shown in FIG19 . For example, 57a-65a, 56a-64a, 21a-29a, and 20a-28a can all adopt the U-shaped wire 23 shown in FIG19 .

[0137] In the bottom slot layer 142, the spans of the bent ends 231 between the two wire slot layers 14a numbered f are 9 and 11. Accordingly, the U-shaped wire 23 with a span of 9 between the two wire slot layers 14a numbered f can adopt the U-shaped wire 23 shown in FIG20 . For example, 20f-11f and 56f-47f can both adopt the U-shaped wire 23 shown in FIG20 . The U-shaped wire 23 with a span of 11 between the two wire slot layers 14a numbered f can adopt the U-shaped wire 23 shown in FIG21 . For example, 1f-12f, 19f-30f, 37f-48f, and 55f-66f can all adopt the U-shaped wire 23 shown in FIG21 .

[0138] It can be understood that the first branch 22a is connected across the U-shaped line 23 of the slot layer 141 and the slot bottom layer 142, realizing the bridging between different phase belts 15, realizing the winding switching between different phase belts 15, and reducing the angle difference on the first branch 22a.

[0139] Referring back to Figure 11 , for the second branch 22b of the U-phase winding 21a, the solid line in Figure 11 represents the bent end 231 of the U-shaped wire 23, while the dashed line represents the welded end 24 formed between two adjacent U-shaped wires 23. This branch 22 enters the wire slot 131 in the wire slot layer 14a numbered f in the stator slot 13 numbered 3, and exits the wire slot 131 in the wire slot layer 14a numbered e in the stator slot 13 numbered 12 (for ease of description, the slot opening layer 141 is numbered a, the slot bottom layer 142 is numbered f, and the numbers from slot opening layer 141 to slot bottom layer 142 are sequentially numbered from a to f).

[0140] The wire grooves 131 that the U-shaped wire 23 in the branch 22 passes through in sequence are 3f-10f, 19e-28d, 37c-46b, 55a-66a, 57b-48c, 39d-30e, 21f-28f, 37e-46d, 55c-64b, 1a-11a, 2b-65c, 56d-47e, 38f-29f, 38e-47d, 56c-65b, 2a-12a, 3b -66c, 57d-48e, 39f-46f, 55e-64d, 1c-10b, 19a-30a, 21b-12c, 3d-66e, 57f-64f, 1e-10d, 19 c-28b, 37a-47a, 38b-29c, 20d-11e, 2f-65f, 2e-11d, 20c-29b, 38a-48a, 39b-30c, 21d-12e.

[0141] It can be seen that in the disclosed embodiment, the second branch 22b is wound around each stator slot group 14b and also wound between different slot layers 14a along the radial direction of the stator core 10. The span of the bent end 231 spanning between two adjacent slot layers 14a is a full distance, and the span of the welded end 24 spanning between two adjacent slot layers 14a is also a full distance.

[0142] Based on the number of full pitches in the embodiment of the present disclosure, 9 are provided. Therefore, the U-shaped line 23 spanning between the wire trough layers 14a numbered b and c can be the U-shaped line 23 shown in FIG16 . For example, 37c-46b can be the U-shaped line 23 shown in FIG16 . The U-shaped line 23 spanning between the wire trough layers 14a numbered d and e can be the U-shaped line 23 shown in FIG17 . For example, 19e-28d can be the U-shaped line 23 shown in FIG17 .

[0143] It can be understood that by setting the span of the U-shaped wire 23 between the wire slot layers 14a between the slot opening layer 141 and the slot bottom layer 142 to a full pitch, the winding switching between the same phase belts 15 of two different stator slot groups 14b can be achieved by using the U-shaped wire 23 to span the radial direction of the stator core 10, thereby simplifying the winding process of the second branch 22b.

[0144] As shown in Figure 11 , in the slot layer 141 , the spans of the bent ends 231 spanning between the two wire slot layers 14a numbered a are 10 and 11. Accordingly, the U-shaped wire 23 spanning between the two wire slot layers 14a numbered a with a span of 10 can adopt the U-shaped wire 23 shown in Figure 22 . For example, 1a-11a, 2a-12a, 37a-47a, and 38a-48a can all adopt the U-shaped wire 23 shown in Figure 22 . The U-shaped wire 23 spanning between the two wire slot layers 14a numbered a with a span of 11 can adopt the U-shaped wire 23 shown in Figure 23 . For example, 55a-66a and 19a-30a can all adopt the U-shaped wire 23 shown in Figure 23 .

[0145] In the bottom slot layer 142, the spans of the bent ends 231 between the two wire slot layers 14a numbered f are 7 and 9. Accordingly, the U-shaped wire 23 with a span of 7 between the two wire slot layers 14a numbered f can adopt the U-shaped wire 23 shown in FIG24 . For example, 3f-10f, 21f-28f, 39f-46f, and 57f-64f can all adopt the U-shaped wire 23 shown in FIG24 . The U-shaped wire 23 with a span of 9 between the two wire slot layers 14a numbered f can adopt the U-shaped wire 23 shown in FIG20 . For example, 38f-29f and 2f-65f can all adopt the U-shaped wire 23 shown in FIG20 .

[0146] It can be understood that the second branch 22b is connected across the U-shaped line 23 of the slot layer 141 and the slot bottom layer 142, realizing the bridging between different phase belts 15, realizing the winding switching between different phase belts 15, and reducing the angle difference on the second branch 22b.

[0147] In summary, for the first branch 22a and the second branch 22b of the U-phase winding 21a, the U-shaped wire 23 used between the two branches 22 can use the U-shaped wire 23 shown in Figures 16, 17, and 20 for both the first branch 22a and the second branch 22b. The U-shaped wire 23 shown in Figures 18, 19, and 21 is only used for the first branch 22a, and the U-shaped wire 23 shown in Figures 22, 23, and 24 is only used for the second branch 22b.

[0148] As can be understood, the nine types of U-shaped wires shown in Figures 16-24 cooperate with each other, enabling the first branch 22a and the second branch 22b to wind the stator slots 13 of the U-phase winding 21a, ensuring the copper fill rate of the stator slots 13 corresponding to the U-phase winding 21a. Furthermore, the interaction between the nine types of U-shaped wires 23 and the first and second branches 22a, 22b prevents the formation of circulating current interference between the two branches 22, thereby improving the operational reliability of the motor stator 100 disclosed herein.

[0149] In one embodiment, as shown in FIG12 , for the first branch 22a of the V-phase winding 21b, the solid line in FIG12 represents the bent end 231 of the U-shaped wire 23, and the dashed line represents the welded end 24 formed between two adjacent U-shaped wires 23. This branch 22 enters the wire slot 131 in the wire slot layer 14a numbered f in the stator slot 13 numbered 13, and exits the wire slot 131 in the wire slot layer 14a numbered e in the stator slot 13 numbered 22 (for ease of description, the slot opening layer 141 is numbered a, the slot bottom layer 142 is numbered f, and the numbers from the slot opening layer 141 to the slot bottom layer 142 are sequentially numbered from a to f).

[0150] The wire grooves 131 that the U-shaped wire 23 in the branch 22 passes through in sequence are 13f-24f, 33e-42d, 51c-60b, 69a-5a, 68b-59c, 50d-41e, 32f-23f, 32e-41d, 50c-59b, 68a-4a, 67b-58c, 49d-40e, 31f-42f, 51e-60d, 69c-6b, 15a-22a, 13 b-4c, 67d-58e, 49f-60f, 69e-6d, 15c-24b, 33a-41a, 32b-23c, 14d-5e, 68f-59f, 68e-5d, 14 c-23b, 32a-40a, 31b-22c, 13d-4e, 67f-6f, 15e-24d, 33c-42b, 51a-58a, 49b-40c, 31d-22e.

[0151] It can be seen that in the embodiment of the present disclosure, the U-shaped line 23 of the first branch 22a that spans between the wire trough layers 14a numbered b and c can also adopt the U-shaped line 23 shown in Figure 16. The U-shaped line 23 that spans between the wire trough layers 14a numbered d and e can also adopt the U-shaped line 23 shown in Figure 17. At the same time, the span of the bent end 231 spanning between the two wire trough layers 14a numbered a is also 7 and 8. Correspondingly, the U-shaped line 23 shown in Figure 18 and the U-shaped line 23 shown in Figure 19 can be used respectively. The span of the bent end 231 spanning between the two wire trough layers 14a numbered f is also 9 and 11. Correspondingly, the U-shaped line 23 shown in Figure 20 and the U-shaped line 23 shown in Figure 21 can be used respectively.

[0152] As shown in FIG13 , for the second branch 22b of the V-phase winding 21b, the solid line in FIG13 represents the bent end 231 of the U-shaped wire 23, and the dashed line represents the welded end 24 formed between two adjacent U-shaped wires 23. This branch 22 enters the slot 131 numbered f in the slot layer 14a of the stator slot 13 numbered 15, and exits the slot 131 numbered e in the slot layer 14a of the stator slot 13 numbered 24. (For ease of description, the slot opening layer 141 is numbered a, the slot bottom layer 142 is numbered f, and the numbers are sequentially from slot opening layer 141 to slot bottom layer 142, from a to f.)

[0153] The wire grooves 131 that the U-shaped wire 23 in the branch 22 passes through in sequence are 15f-22f, 31e-40d, 49c-58b, 67a-6a, 69b-60c, 51d-42e, 33f-40f, 49e-58d, 67c-4b, 13a-23a, 14b-5c, 68d-59e, 50f-41f, 50e-59d, 68c-5b, 14a-24a, 15b -6c, 69d-60e, 51f-58f, 67e-4d, 13c-22b, 31a-42a, 33b-24c, 15d-6e, 69f-4f, 13e-22d, 31c -40b, 49a-59a, 50b-41c, 32d-23e, 14f-5f, 14e-23d, 32c-41b, 50a-60a, 51b-42c, 33d-24e.

[0154] It can be seen that in the embodiment of the present disclosure, the U-shaped line 23 of the second branch 22b spanning between the wire trough layers 14a numbered b and c can also adopt the U-shaped line 23 shown in Figure 16. The U-shaped line 23 spanning between the wire trough layers 14a numbered d and e can also adopt the U-shaped line 23 shown in Figure 17. At the same time, the span of the bent end 231 spanning between the two wire trough layers 14a numbered a is also 10 and 11. Correspondingly, the U-shaped line 23 shown in Figure 22 and the U-shaped line 23 shown in Figure 23 can be used respectively. The span of the bent end 231 spanning between the two wire trough layers 14a numbered f is also 7 and 9. Correspondingly, the U-shaped line 23 shown in Figure 24 and the U-shaped line 23 shown in Figure 20 can be used respectively.

[0155] In summary, for the first branch 22a and the second branch 22b of the V-phase winding 21b, the U-shaped wire 23 used between the two branches 22 can use the U-shaped wire 23 shown in Figures 16, 17, and 20 for both the first branch 22a and the second branch 22b. The U-shaped wire 23 shown in Figures 18, 19, and 21 is only used for the first branch 22a, and the U-shaped wire 23 shown in Figures 22, 23, and 24 is only used for the second branch 22b.

[0156] As can be understood, the nine U-shaped wires shown in Figures 16-24 work together to allow the first branch 22a and the second branch 22b to wind the stator slots 13 of the V-phase winding 21b, ensuring the copper fill rate of the stator slots 13 corresponding to the V-phase winding 21b. Furthermore, the interaction between the nine U-shaped wires 23, the first branch 22a, and the second branch 22b prevents circulating current interference between the two branches 22, thereby improving the operational reliability of the motor stator 100 disclosed herein.

[0157] In one embodiment, as shown in FIG14 , for the first branch 22a of the W-phase winding 21c, the solid line in FIG14 represents the bent end 231 of the U-shaped wire 23, and the dashed line represents the welded end 24 formed by two adjacent U-shaped wires 23. This branch 22 enters the wire slot 131 numbered f in the wire slot layer 14a of the stator slot 13 numbered 7, and exits the wire slot 131 numbered e in the wire slot layer 14a of the stator slot 13 numbered 16 (for ease of description, the slot opening layer 141 is numbered a, the slot bottom layer 142 is numbered f, and the numbers from the slot opening layer 141 to the slot bottom layer 142 are sequentially numbered from a to f).

[0158] The wire grooves 131 that the U-shaped wire 23 in the branch 22 passes through in sequence are 7f-18f, 27e-36d, 45c-54b, 63a-71a, 62b-53c, 44d-35e, 26f-17f, 26e-35d, 44c-53b, 62a-70a, 61b-52c, 43d-34e, 25f-36f, 45e-54d, 63c-72b, 9a-16a, 7 b-70c, 61d-52e, 43f-54f, 63e-72d, 9c-18b, 27a-35a, 26b-17c, 8d-71e, 62f-53f, 62e-71d, 8c-17b, 26a-34a, 25b-16c, 7d-70e, 61f-72f, 9e-18d, 27c-36b, 45a-52a, 43b-34c, 25d-16e.

[0159] As shown in FIG15 , for the second branch 22b of the W-phase winding 21c, the solid line in FIG15 represents the bent end 231 of the U-shaped wire 23, and the dashed line represents the welded end 24 formed between two adjacent U-shaped wires 23. This branch 22 enters the wire slot 131 numbered f in the wire slot layer 14a of the stator slot 13 numbered 9, and exits the wire slot 131 numbered e in the wire slot layer 14a of the stator slot 13 numbered 18 (for ease of description, the slot opening layer 141 is numbered a, the slot bottom layer 142 is numbered f, and the numbers from the slot opening layer 141 to the slot bottom layer 142 are sequentially numbered from a to f).

[0160] The wire grooves 131 that the U-shaped wire 23 in the branch 22 passes through in sequence are 9f-16f, 25e-34d, 43c-52b, 61a-72a, 63b-54c, 45d-36e, 27f-34f, 43e-52d, 61c-70b, 7a-17a, 8b-71c, 62d-53e, 44f-35f, 44e-53d, 62c-71b, 8a-18a, 9b -72c, 63d-54e, 45f-52f, 61e-70d, 7c-16b, 25a-36a, 27b-18c, 9d-72e, 63f-70f, 7e-16d, 25 c-34b, 43a-53a, 44b-35c, 26d-17e, 8f-71d, 8e-17d, 26c-35b, 44a-54a, 45b-36c, 27d-18e.

[0161] It can be seen that for the first branch 22a and the second branch 22b of the W-phase winding 21c, the U-shaped wire 23 used between the two branches 22 can use the U-shaped wire 23 shown in Figures 16, 17, and 20 for both the first branch 22a and the second branch 22b. Among them, the U-shaped wire 23 shown in Figures 18, 19, and 21 is only used for the first branch 22a, and the U-shaped wire 23 shown in Figures 22, 23, and 24 is only used for the second branch 22b.

[0162] As can be understood, the nine U-shaped wires shown in Figures 16-24 cooperate with each other, enabling the first branch 22a and the second branch 22b to wind the stator slots 13 of the W-phase winding 21c, ensuring the copper fill rate of the stator slots 13 corresponding to the W-phase winding 21c. Furthermore, the interaction between the nine U-shaped wires 23, the first branch 22a, and the second branch 22b prevents the formation of circulating current interference between the two branches 22, thereby improving the operational reliability of the motor stator 100 disclosed herein.

[0163] In one embodiment, as shown in Figures 10-13 , for the first branches 22a of the U-phase winding 21a and the V-phase winding 21b, the winding pattern of the stator slots 13 numbered 1-3 of the U-phase winding 21a is identical to the winding pattern of the stator slots 13 numbered 49-51 of the V-phase winding 21b. Correspondingly, the remaining stator slot groups 14b of the V-phase winding 21b also have a stator slot group 14b with the same winding pattern as the U-phase winding 21a. The second branches 22b of the U-phase winding 21a and the V-phase winding 21b also have the aforementioned features.

[0164] The span between the stator slots 13 numbered 1-3 and the stator slots 13 numbered 49-51 in the same phase belt 15 is 24. It can be understood that the U-phase winding 21a and the V-phase winding 21b are wound in the same manner and are circumferentially spaced 120 degrees apart.

[0165] As shown in Figures 14 and 15 , the W-phase winding 21c is wound in the same manner as the U-phase winding 21a and the V-phase winding 21b. Accordingly, the interval angles between the U-phase winding 21a, the V-phase winding 21b, and the W-phase winding 21c are all 120°. This ensures that the windings 21 are symmetrical with each other, ensuring proper operation of the motor stator 100 disclosed herein.

[0166] In one embodiment, as shown in Figures 10 and 11 , the inlet end 221 and outlet end 222 of the same branch 22 are located in two adjacent stator slot groups 14b of the branch 22. Specifically, as shown in Figure 10 , the inlet end 221 of the first branch 22a is located in the stator slot 13 numbered 1f, and the outlet end 222 of the first branch 22a is located in the stator slot 13 numbered 10e. As shown in Figure 11 , the inlet end 221 of the second branch 22b is located in the stator slot 13 numbered 3f, and the outlet end 222 of the second branch 22b is located in the stator slot 13 numbered 12e.

[0167] It is understandable that the span between the two stator slots 13 corresponding to the inlet end 221 and the outlet end 222 of the same branch 22 is a full distance, so that the winding direction of each branch 22 forms a loop to ensure the winding quality of the branch 22.

[0168] In one embodiment, referring back to FIG. 2 , the incoming wire end 221 and the outgoing wire end 222 of each branch 22 of each phase winding 21 are located on the same side of the stator core 10 , thereby reducing the difficulty of outgoing wires of each phase winding 21 and simplifying the electrical connection method between each phase winding 21 .

[0169] Please refer to FIG. 25 for a connection diagram of a three-phase winding 20 provided in an embodiment of the present disclosure.

[0170] As shown in Figure 25, each phase winding 21 is composed of a first branch 22a and a second branch 22b. The input end 221 of the first branch 22a and the second branch 22b of each phase winding 21 are electrically connected, and the output end 222 of the first branch 22a and the second branch 22b of each phase winding 21 are electrically connected, thereby realizing the parallel connection of the two branches 22 of the same-phase winding 21.

[0171] As shown in Figure 25, the output terminals 222 of the U-phase winding 21a, the V-phase winding 21b, and the W-phase winding 21c are electrically connected to each other, so that the motor stator 100 of the present disclosure adopts a star connection. Because the starting current of the star connection is relatively low, it can be understood that the star connection of the motor stator 100 of the present disclosure can improve the starting speed of the motor 200 of the present disclosure.

[0172] It is understood that in another embodiment, as shown in FIG26 , the input terminal 221 of the U-phase winding 21a is electrically connected to the output terminal 222 of the V-phase winding 21b, the input terminal 221 of the V-phase winding 21b is electrically connected to the output terminal 222 of the W-phase winding 21c, and the input terminal 221 of the W-phase winding 21c is electrically connected to the output terminal 222 of the U-phase winding 21a. This allows the stator 100 of the motor of the present disclosure to adopt a delta connection. This improves the operating power of the motor 200 of the present disclosure.

[0173] It should be understood that the terms "first," "second," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0174] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0175] It should be understood that the application of the present disclosure is not limited to the above examples. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the scope of protection of the appended claims of the present disclosure. Those skilled in the art will understand that implementing all or part of the processes of the above embodiments and making equivalent changes in accordance with the claims of the present disclosure still fall within the scope of the present disclosure.

Claims

1. A motor stator (100), characterized in that: include: A stator core (10), the stator core (10) is cylindrical, and the stator core (10) comprises: An inner wall (11), wherein a plurality of stator slots (13) are distributed in a circumferential direction of the inner wall (11), each of the three adjacent stator slots (13) constitutes a stator slot group (14b), and one stator slot (13) corresponds to one stator slot group (14b), and in a radial direction of the stator core (10), a plurality of line slots (131) are arranged in each of the stator slots (13), and the line slots (131) with the same radius size in each of the stator slots (13) are arranged in the same line slot layer (14a); and A three-phase winding (20), wherein the three-phase winding (20) is alternately wound in sequence on different stator slot groups (14b) along the circumferential direction of the stator core (10), and the three-phase winding (20) is also wound in sequence on each of the line slot layers (14a), each phase winding (21) of the three-phase winding (20) comprises two branches (22), each branch (22) is wound in the stator slots (13) of a plurality of stator slot groups (14b) arranged at intervals, and the same branch (22) in two centrally symmetrical stator slot groups (14b) is wound in the same manner.

2. The motor stator (100) according to claim 1, characterized in that: The two branches (22) each have an inlet end (221), the inlet ends (221) of the two branches (22) are located in two stator slots (13) spaced apart from each other in the same stator slot group (14b), and are located on the same slot layer (14a), wherein one stator slot (13) is spaced between the inlet ends (221) of the two branches (22); and / or, The two branches (22) each have an outlet end (222), the outlet ends (222) of the two branches (22) are located in two stator slots (13) spaced apart from each other in another stator slot group (14b), and are located in the same slot layer (14a), wherein one stator slot (13) is spaced between the outlet ends (222) of the two branches (22).

3. The motor stator (100) according to claim 2, characterized in that: The inlet end (221) and the outlet end (222) of each branch (22) are located on two adjacent wire trough layers (14a), and the radius of the wire trough layer (14a) where the inlet end (221) of the branch (22) is located is greater than the radius of the wire trough layer (14a) where the outlet end (222) of the branch (22) is located.

4. The motor stator (100) according to claim 2, characterized in that: The branch (22) comprises: A plurality of U-shaped wires (23) connected in series, each of the U-shaped wires (23) comprising a bent end (231), and a welding end (24) formed between two adjacent U-shaped wires (23), the bent end (231) and the welding end (24) alternately bridged between the stator slot groups (14b) and alternately bridged between the slot layers (14a); The span of the bent end (231) spanning between two adjacent wire trough layers (14a) is a full span; and the span of the welding end (24) spanning between two adjacent wire trough layers (14a) is a full span.

5. The motor stator (100) according to claim 4, characterized in that: The inlet end (221) and the outlet end (222) of the same branch (22) are located in two adjacent stator slot groups (14b), and the span between the two stator slots (13) corresponding to the inlet end (221) and the outlet end (222) of the branch (22) is an integral span.

6. The motor stator (100) according to claim 4, characterized in that: The wire slot layer (14a) comprises: A groove bottom layer (142), wherein the radius of the groove bottom layer (142) is greater than the radius of any other groove layer (14a) Size; and A notch layer (141), wherein the radius of the notch layer (141) is smaller than the radius of any other of the line slot layers (14a); The two branches (22) of the winding (21) of the same phase include a first branch (22a) and a second branch (22b); the span of the bent end (231) of the first branch (22a) at the bottom layer (142) of the slot is n and n+2, and the span of the bent end (231) of the first branch (22a) at the notch layer (141) is n-2 and n-1; the span of the bent end (231) of the second branch (22b) at the bottom layer (142) of the slot is n-2 and n, and the span of the bent end (231) of the second branch (22b) at the notch layer (141) is n+1 and n+2, wherein the whole span is n.

7. The motor stator (100) according to claim 6, characterized in that: The inlet end (221) of each branch (22) is located on the bottom layer (142) of the slot, and the outlet end (222) of each branch (22) is located on the wire slot layer (14a) adjacent to the bottom layer (142).

8. The motor stator (100) according to any one of claims 1 to 7, characterized in that: The inlet end (221) and the outlet end (222) of each branch (22) of each phase of the winding (21) are located on the same side of the stator core (10), so as to realize the electrical connection between the windings (21) of each phase.

9. The motor stator (100) according to claim 8, characterized in that: The incoming wire ends (221) of the two branches (22) of the winding (21) of the same phase are electrically connected, and the outgoing wire ends (222) of the branches (22) of the three-phase winding (21) are electrically connected to each other.

10. The motor stator (100) according to claim 8, characterized in that: After the inlet ends (221) of the two branches (22) of the winding (21) of the same phase are electrically connected to each other, they are electrically connected to the outlet ends (222) of the two branches (22) of the winding (21) of another phase.

11. A motor (200), characterized in that: include: Motor rotor (201); as well as The motor stator (100) according to any one of claims 1 to 10; Wherein, the motor rotor (201) is located inside the motor stator (100).

12. A drive assembly (300), characterized in that: include: Reducer (301); as well as The motor (200) according to claim 11, wherein the motor (200) is transmission-connected to the reducer (301).

13. A vehicle (400), characterized in that: include: Wheel(401); as well as The drive assembly (300) as claimed in claim 12, wherein the motor (200) of the drive assembly (300) is transmission-connected to the wheel (401) via a reducer (301) of the drive assembly (300), and is used to drive the wheel (401) to rotate so as to control the operation of the vehicle (400).

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