Odd-layer multi-branch winding structure, stator assembly and motor

Abstract

The invention relates to an odd-number-layer multi-branch winding structure, a stator assembly and a motor. The odd-number-layer multi-branch winding structure comprises three phases of winding circuits. The winding circuit of each phase comprises n winding branches which are connected in parallel, the wire inlet positions of the (n-1) winding branches are the groove layers with the serial numbers of m + 1 of continuous (n-1) conductor grooves with the serial numbers of r, r + 1... [r + (n-2)], and the wire outlet positions of the (n-1) winding branches are the groove layers with the serial numbers of m + 1 of continuous (n-1) conductor grooves with the serial numbers of s, s + 1... [s + (n-2)]; and the wire inlet position of the other winding branch is the groove layer with the serial number of 2 of the conductor groove with the serial number of r + (n-2), and the wire outlet position of the other winding branch is the groove layer with the serial number of 1 of the conductor groove with the serial number of t. Concentrated incoming and outgoing lines of the odd-layer multi-branch winding structure can be realized, so that the phase copper bars and the star point copper bars have relatively simple structures.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a winding structure of an odd-layer multi-branch, a stator assembly and an electric machine. BACKGROUND

[0002] The winding structure of the stator assembly of the flat wire motor often involves the arrangement of the in-out wire position. Whether the in-out wire position is concentrated directly affects the size of the phase copper bar and the star point copper bar, and further affects the vibration resistance reliability of the Busbar assembly under actual working conditions. When the in-out wire position of the winding structure is not concentrated, the size of the phase copper bar and the star point copper bar is too large. When the phase copper bar and the star point copper bar are further prepared as a Busbar assembly, the Busbar assembly has the risk of vibration failure. The existing winding structure can arrange m-1 winding branches in the m parallel winding branches in the circumferential region, and arrange another winding branch in the circumferential region and staggered with the circumferential region of the aforementioned m-1 winding branches, so that the out-of-line positions of the m-1 winding branches of the three phases are continuously distributed along the circumference, and the in-line positions of the three phases are staggered. The out-of-line positions of the other winding branch of the three phases are still crossed with the in-line positions of the three phases. Since the circumferential region corresponding to the out-of-line position at this time has a small angle range, the star point copper bar has a relatively small size. At the same time, since the out-of-line position and the in-line position cross less at this time, the star point copper bar and the phase copper bar have a relatively simple structure. When the phase copper bar and the star point copper bar are prepared as a Busbar assembly, it is not easy to fail due to vibration. However, the aforementioned multi-branch winding structure is usually even-layered, and the design of the in-out wire concentrated layout is difficult to apply to the odd-layer winding structure. SUMMARY

[0003] Based on this, the present application provides an odd-layer multi-branch winding structure, a stator assembly and an electric machine to improve the problem that the odd-layer multi-branch winding structure in the prior art is difficult to realize the in-out wire concentrated layout.

[0004] In a first aspect, the present application provides an odd-layer multi-branch winding structure, characterized in that the odd-layer multi-branch winding structure is used in a stator assembly, the phase number of the stator assembly is three-phase and the pole pair number is p, wherein p is a positive integer greater than 1, the stator assembly further comprises a stator core, the stator core is provided with a continuous Z conductor slot with a serial number of 1-Z, wherein Z is a positive integer multiple of 12, each conductor slot has a continuous m+1 slot layer with a serial number of 1-(m+1), wherein m is a positive even number; The odd-layer multi-branch winding structure includes three-phase winding lines, two of which are obtained by sequentially shifting the winding lines of the other phase by Z / 3p and 2Z / 3p conductor slots; Each winding circuit of each phase comprises n parallel winding branches, where n is a positive integer not less than 3, the incoming wire positions of n-1 winding branches are respectively the slot layers numbered m+1 of the continuous n-1 conductive slots numbered r, r+1, … [r+(n-2)], and the outgoing wire positions are respectively the slot layers numbered m+1 of the continuous n-1 conductive slots numbered s, s+1, … [s+(n-2)], where the number of the conductive slots between the conductive slot numbered r and the conductive slot numbered s is not less than Z / 3p+n-1 and less than Z / 2; The incoming wire position of the other winding branch is the slot layer numbered 2 of the conductive slot numbered r+(n-2), and the outgoing wire position is the slot layer numbered 1 of the conductive slot numbered “t”. The odd-layer multi-branch winding structure further comprises phase copper bars and a star point copper bar, the phase copper bars correspond to the three phases of the stator assembly one by one, and the incoming wire positions of the n winding branches of each phase are connected to the phase copper bar corresponding to the phase; the star point copper bar is provided in two, one of the star point copper bars is connected to the incoming wire positions of the n-1 winding branches of each phase, and the other star point copper bar is connected to the outgoing wire positions of the other winding branch of each phase.

[0005] In one of the embodiments, any winding branch comprises an effective part arranged in the conductive slot, a first extension part arranged at one end of the effective part, and a second extension part arranged at the other end of the effective part, any winding branch is wound in turn with the first extension part, the effective part, the second extension part, the effective part, and the first extension part as a cycle, and the winding is completed with the first extension part.

[0006] In one of the embodiments, the first extension parts of the incoming wire positions of the n-1 winding branches of any phase extend along the same side in the circumferential direction, and the first extension parts of the outgoing wire positions extend along the same side in the circumferential direction, and the extension directions of the first extension parts of the incoming wire positions and the first extension parts of the outgoing wire positions are the same side in the circumferential direction. The first extension part of the incoming wire position of the other winding branch extends along the same side in the circumferential direction as the first extension parts of the incoming wire positions of the n-1 winding branches, and the first extension part of the outgoing wire position of the other winding branch extends along the other side in the circumferential direction to be close to the first extension part of the incoming wire position.

[0007] In one of the embodiments, any winding branch comprises an incoming line, an outgoing line, a lap winding, a cross winding and a reverse winding, the incoming line comprises an incoming effective edge serving as the effective part, an incoming hairpin end serving as the first extension part and an incoming welding end serving as the second extension part, the incoming effective edge is arranged in one, the incoming hairpin end and the incoming welding end are arranged on both sides of the incoming effective edge respectively; the outgoing line comprises an outgoing effective edge serving as the effective part, an outgoing hairpin end serving as the first extension part and an outgoing welding end serving as the second extension part, the outgoing effective edge is arranged in one, the outgoing hairpin end and the outgoing welding end are arranged on both sides of the outgoing effective edge respectively; the lap winding comprises a lap effective edge serving as the effective part, a lap hairpin end serving as the first extension part and a lap welding end serving as the second extension part, the lap effective edge is arranged in two, the lap welding end corresponds to the lap effective edge one by one and is connected with the same end of the two lap effective edges respectively, the two lap welding ends extend in the direction of approaching each other, the lap hairpin end connects the other end of the two lap effective edges; the cross winding comprises a cross effective edge serving as the effective part, a cross hairpin end serving as the first extension part and a cross welding end serving as the second extension part, the cross effective edge is arranged in two, the cross welding end corresponds to the cross effective edge one by one and is connected with the same end of the two cross effective edges respectively, the two cross welding ends extend in the same direction, the cross hairpin end connects the other end of the two cross effective edges; the reverse winding comprises a reverse effective edge serving as the effective part, a reverse hairpin end serving as the first extension part and a reverse welding end serving as the second extension part, the reverse effective edge is arranged in two, the reverse welding end corresponds to the reverse effective edge one by one and is connected with the same end of the two reverse effective edges respectively, the two reverse welding ends extend in the same direction, the reverse hairpin end connects the other end of the two reverse effective edges.

[0008] In one of the embodiments, the leading effective side of the lead-in wire is wound in the slot layer with serial number m+1 or serial number 2 and the lead-in wire is used as the incoming position of the winding branch, the leading effective side of the lead-out wire is wound in the slot layer with serial number m+1 or serial number 1 and the lead-out wire is used as the outgoing position of the winding branch, the two effective sides of the lap winding coil are wound in the slot layer with serial number 1 and serial number 2, or in the slot layer with serial number 3 and serial number 4, or in the slot layer with serial number m-1 and serial number m, respectively, the two effective sides of the cross-over coil are wound in the slot layer with serial number m+1 and serial number m+1, respectively, and the two effective sides of the anti-twist coil are wound in the slot layer with serial number 1 and serial number 2, respectively.

[0009] In one of the embodiments, the pitches of the lap winding coils wound in the same slot layer are equal, the pitches of the cross-over coils are set as two kinds, and the pitches of the anti-twist coils are equal.

[0010] In one of the embodiments, p=4, Z=72, m=6, n=4, the three phases of the stator assembly are U phase, V phase and W phase, respectively, the winding route of the first winding branch of the U phase is: 1.7-10.6-1.5-10.4-1.3-10.2-1.1-10.1-19.2-10.3-19.4-10.5-19.6-10.7-20.7-29.6-20.5-29.4-20.3-29.2-20.1-29.1-38.2-29.3-38.4-29.5-38.6-29.7-39.7-48.6-39.5-48.4-39.3-48.2-39.1-48.1-57.2-48.3-57.4-48.5-57.6-48.7; the winding route of the second winding branch of the U phase is: 2.7-11.6-2.5-11.4-2.3-11.2-2.1-11.1-20.2-11.3-20.4-11.5-20.6-11.7-21.7-30.6-21.5-30.4-21.3-30.2-21.1-30.1-39.2-30.3-39.4-30.5-39.6-30.7-37.7-46.6-37.5-46.4-37.3-46.2-37.1-46.1-55.2-46.3-55.4-46.5-55.6-46.7; the winding route of the third winding branch of the U phase is: 3.7-12.6-3.5-12.4-3.3-12.2-3.1-12.1-21.2-12.3-21.4-12.5-21.6-12.7-19.7-28.6-19.5-28.4-19.3-28.2-19.1-28.1-37.2-28.3-37.4-28.5-37.6-28.7-38.7-47.6-38.5-47.4-38.3-47.2-38.1-47.1-56.2-47.3-56.4-47.5-56.6-47.7; The winding route of the fourth winding branch of the U phase is: 3.2-66.3-3.4-66.5-3.6-66.7-56.7-65.6-56.5-65.4-56.3-65.2-56.1-65.1-2.2-65.3-2.4-65.5-2.6-65.7-55.7-64.6-55.5-64.4-55.3-64.2-55.1-64.1-1.2-64.3-1.4-64.5-1.6-64.7-57.7-66.6-57.5-66.4-57.3-66.2-57.1-66.1.

[0011] In one of the embodiments, the number of the conductor slots spaced between the conductor slot with serial number r and the conductor slot with serial number s is equal to Z / 3+n-1.

[0012] In one of the embodiments, the phase copper bar comprises a first copper bar body and first soldering terminals, the first soldering terminals correspond to the n winding branches one by one, and the first copper bar body connects the n first soldering terminals.

[0013] In one of the embodiments, the star point copper bar comprises a second copper bar body and second soldering terminals, the second soldering terminals correspond to the n-1 winding branches of each phase one by one or correspond to the other winding branch of each phase one by one, and the second copper bar body connects the 3(n-1) second soldering terminals or connects the 3 soldering terminals.

[0014] In a second aspect, the present application provides a stator assembly, which comprises any one of the odd-layer multi-branch winding structures provided by the present application.

[0015] In a third aspect, the present application provides an electric machine, which comprises any one of the stator assemblies provided by the present application.

[0016] When the winding structure is an odd-layer multi-branch winding structure, the application sets the wire-in positions of n-1 winding branches of each phase of the winding structure to the slot layer with the sequence number of m+1 of the continuous n-1 conductor slots, and the wire-out positions to the slot layer with the sequence number of m+1 of the continuous n-1 conductor slots with the sequence numbers of s, s+1,..., [s+(n-2)], respectively, and sets the number of conductor slots between the conductor slot with the sequence number of r and the conductor slot with the sequence number of s to be not less than Z / 3p+n-1; meanwhile, the wire-in position of another winding branch is set to the slot layer with the sequence number of 2 of the conductor slot with the sequence number of r+(n-2), and the wire-out position is set to the slot layer with the sequence number of 1 of the conductor slot with the sequence number of "t"; and the phase copper bars are one-to-one corresponding to the three phases of the stator assembly, and the wire-in positions of the n winding branches of the corresponding phase are connected, and two star copper bars are set, one of which is connected to the wire-in positions of the n-1 winding branches of each phase, and the other is connected to the wire-out positions of the other winding branch of each phase, so that the three phase copper bars and the two phase copper bars have relatively simple structures and relatively small spans in the circumferential direction; meanwhile, the three phase copper bars also have relatively small spans when fixed together by the plastic material, and the relatively large span of one star copper bar does not overlap with the three phase copper bars fixed together in the circumferential direction, while the relatively small span of the other star copper bar overlaps with the three phase copper bars fixed together, and only relatively less intersections exist when the relatively small span of the other star copper bar overlaps with the three phase copper bars fixed together, so that the application can realize the concentrated wire-in and wire-out of the odd-layer multi-branch winding structure, so that the phase copper bars and the star copper bars have relatively simple structures, so as not to be easily failed due to vibration when the phase copper bars and the star copper bars are prepared as the Busbar assembly. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure schematic diagram of the stator assembly provided by an embodiment of the application; Figure 2 The structure schematic diagram of the conductor slot slot layer of the stator assembly provided by an embodiment of the application; Figure 3 The winding route map of the odd-layer multi-branch winding structure provided by an embodiment of the application; Figure 4 The winding route map of the U-phase winding of the odd-layer multi-branch winding structure provided by an embodiment of the application; Figure 5 The structure schematic diagram of the lead-in wire of the odd-layer multi-branch winding structure provided by an embodiment of the application; Figure 6 The structure schematic diagram of the lead-out wire of the odd-layer multi-branch winding structure provided by an embodiment of the application; Figure 7 The structure schematic diagram of the lap winding coil of the odd-layer multi-branch winding structure provided by an embodiment of the application; Figure 8 A structure diagram of a cross-line coil of an odd-layer multi-branch winding structure according to an embodiment of the present application is provided. Figure 9 A structure diagram of a reverse-torque coil of an odd-layer multi-branch winding structure according to an embodiment of the present application is provided. Figure 10 A structure diagram of a phase copper bar and a star point copper bar of an odd-layer multi-branch winding structure according to an embodiment of the present application is provided.

[0018] Reference signs: 100, phase copper bar; 110, first copper bar body; 120, first soldering terminal; 200, star point copper bar; 210, second copper bar body; 220, second soldering terminal; 300, lead-in line; 310, lead-in effective edge; 320, lead-in hairpin end; 330, lead-in soldering end; 400, lead-out line; 410, lead-out effective edge; 420, lead-out hairpin end; 430, lead-out soldering end; 500, lap winding coil; 510, lap winding effective edge; 520, lap winding hairpin end; 530, lap winding soldering end; 600, cross-line coil; 610, cross-line effective edge; 620, cross-line hairpin end; 630, cross-line soldering end; 700, reverse-torque coil; 710, reverse-torque effective edge; 720, reverse-torque hairpin end; 730, reverse-torque soldering end; 800, stator core; 810, conductor slot; 910, effective part; 920, first extension part; 930, second extension part. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely used to explain the present application and should not be used to limit the present application.

[0020] It should be noted that the diagrams provided in the embodiments only schematically illustrate the basic concept of the present application.

[0021] The structures, proportions, sizes, etc. shown in the drawings of the present specification are merely used to cooperate with the content disclosed in the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the defined conditions under which the present application can be implemented. Any modification of the structure, change of the proportional relationship or adjustment of the size, which does not affect the effects that can be produced by the present application and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present application.

[0022] The positional or positional relationship indicated in the specification such as "upper", "lower", "left", "right", "middle", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential" and the like are based on the positional or positional relationship shown in the drawings, and are only for the convenience of simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0023] As described in the background, when the winding lines of any phase of the multi-phase winding structure each include a plurality of parallel winding branches, the wire-in positions of the plurality of winding branches of any phase are connected with the phase copper bars, and the phase copper bars correspond one-to-one to the plurality of phases of the winding structure. At the same time, the wire-out positions of the plurality of winding branches of the plurality of phases can each be connected with the star point copper bar to form a "star point". Since the phase copper bars and the star point copper bar are distributed along the circumferential direction of the stator core, in order to facilitate the preparation and processing of the phase copper bars and the star point copper bar with the winding line stator assembly of the plurality of phases, the phase copper bars and the star point copper bar are usually integrated, for example, the phase copper bar 100 and the star point copper bar are fixed by a plastic material.

[0024] For the existing even-layer three-phase winding structure, m-1 winding branches of the m parallel winding branches can also be arranged in a circumferential region, for example, when the stator core is provided with Z conductor slots along the circumferential direction, m-1 winding branches of the three phases are mainly arranged in Z×(m-1) / m continuous conductor slots, and the other winding branch is arranged in a circumferential region and is staggered with the circumferential region of the m-1 winding branches, for example, the other winding branch of the three phases is mainly arranged in the remaining Z / m conductor slots, so that the wire-out positions of the m-1 winding branches of the three phases are distributed continuously along the circumferential direction and the wire-in positions of the three phases are staggered; and the wire-out position of the other winding branch of the three phases is still crossed with the wire-in position of the three phases. Since the circumferential region corresponding to the wire-out position has a small angle range, the star point copper bar has a relatively small size; at the same time, since the wire-out position and the wire-in position are less crossed, the star point copper bar and the phase copper bar have a relatively simple structure. On this basis, when the phase copper bar and the star point copper bar are prepared into a Busbar assembly by a plastic material, the Busbar assembly is connected stably with the winding lines of the three phases and is not easy to fail due to vibration. However, for the odd-layer winding structure, it is difficult to directly realize the wire-in and wire-out concentrated arrangement by the foregoing design.

[0025] Based on this, this application provides an odd-layer multi-branch winding structure for a stator assembly. The stator assembly has three phases and p pole pairs, where p is a positive integer greater than 1. The stator assembly also includes a stator core 800. The stator core 800 is provided with Z consecutive conductor slots 810 numbered 1-Z, where Z is a multiple of 12. Each conductor slot 810 has m+1 consecutive slot layers numbered 1-(m+1), where m is a positive even number. The winding structure of the odd-layer multi-branch includes three phase winding lines, of which the winding lines of two phases are obtained by sequentially shifting the winding lines of the other phase by Z / 3p and 2Z / 3p conductor slots 810. Each phase of the winding circuit includes n parallel winding branches, where n is a positive integer not less than 3. The incoming positions of the n-1 winding branches are the m+1 slot layer of the consecutive n-1 conductor slots 810 with serial numbers r, r+1...[r+(n-2)] and the outgoing positions are the m+1 slot layer of the consecutive n-1 conductor slots 810 with serial numbers s, s+1...[s+(n-2)]. The number of conductor slots 810 between the conductor slot 810 with serial number r and the conductor slot 810 with serial number s is not less than Z / 3p+n-1 and less than Z / 2. The incoming line of the other winding branch is located in the slot layer with serial number 2 of conductor slot 810 with serial number r+(n-2), and the outgoing line is located in the slot layer with serial number 1 of conductor slot 810 with serial number "t". The odd-layer multi-branch winding structure also includes phase copper busbars 100 and star copper busbars 200. The phase copper busbars 100 correspond one-to-one with the three phases of the stator assembly, and the phase copper busbars 100 are connected to the input positions of the n winding branches of their corresponding phases. There are two star copper busbars 200. One star copper busbar 200 is connected to the input positions of the n-1 winding branches of each phase, and the other star copper busbar 200 is connected to the output positions of the other winding branch of each phase.

[0026] like Figure 1 As shown in this embodiment, the stator assembly can have three phases and p pole pairs, where p is a positive integer greater than 1, such as p = 2, 3, 4, or 5. The stator assembly can include a stator core 800, a winding structure, phase copper busbars 100, and star-point copper busbars 200. The stator core 800 can be formed by laminations and can be configured as a hollow cylindrical structure. Z conductor slots 810 can be evenly spaced circumferentially on the inner side of the stator core 800, where Z can be a multiple of 12, such as Z = 12, 24, 36, 48, or 60. The conductor slots 810 can be used for winding conductors, such as for winding flat copper wires; in this case, the stator assembly is suitable for a flat wire motor.

[0027] As shown in Figure 2 For any conductor slot 810, it can have m+1 slot layers according to the radial position of the conductor when it is wound in the conductor slot 810, where m is a positive even number, for example, m=2, 4, 6 or 8, etc. For ease of description, the serial numbers of the m+1 slot layers of the conductor slot 810 can be arranged in sequence from inside to outside along the radial direction or from outside to inside along the radial direction, for example, the slot layer with serial number 1, the slot layer with serial number 2, …, the slot layer with serial number m+1; the embodiment is described by taking the slot layer with serial number 1- (m+1) as an example along the radial direction outward of the stator core 800.

[0028] As shown in Figure 1 and Figure 3 In the embodiment, the winding structure can be an odd-layer multi-branch winding structure, which can be composed of the conductors wound in the conductor slot 810. The winding structure can include three-phase winding lines, wherein the winding lines of two phases can be obtained by translating the winding line of another phase by Z / 3p and 2Z / 3p conductor slots 810 in sequence, and the translation direction can be the clockwise direction or the counterclockwise direction of the circumferential direction of the stator core 800. The three-phase winding lines can be wound into a structure similar to a rotary body, wherein the middle part can be arranged on the stator core 800, and the two ends can extend out of the stator core 800.

[0029] As shown in Figure 3 and Figure 4 For any phase, the winding line thereof includes n winding branches, and the n winding branches can adopt a parallel winding mode; wherein n is a positive integer not less than 3, for example, n=3, 4, 5 or 6, etc.

[0030] As shown in Figure 4 In the n winding branches of the same phase, the incoming positions of n-1 winding branches are the m+1 slot layers of the continuous n-1 conductor slots 810 with serial numbers r, r+1, …, [r+(n-2)], and the appearing positions of the n-1 winding branches are the slot layers with serial number m+1 of the continuous n-1 conductor slots 810 with serial numbers s, s+1, …, [s+(n-2)], wherein the number of conductor slots 810 between the conductor slot 810 with serial number r and the conductor slot 810 with serial number s is not less than Z / 3p+n-1.

[0031] It should be noted that in the present embodiment, the number of conductor slots 810 spaced apart between two conductor slots 810 can be defined as the number of conductor slots 810 corresponding to the minimum number of conductor slots 810 spaced apart between two conductor slots 810 in the clockwise direction or the counterclockwise direction of the stator core 800, for example, if Z = 72, then one conductor slot 810 should be spaced apart between the conductor slot 810 with the serial number of 71 and the conductor slot 810 with the serial number of 1, instead of 69 conductor slots 810. Based on this, the number of conductor slots 810 spaced apart between the conductor slot 810 with the serial number of r and the conductor slot 810 with the serial number of s should also be less than Z / 2, that is, not more than half of the Z conductor slots 810.

[0032] As shown in FIG. 8, the conductor slot 810 with the serial number of r is connected to the conductor slot 810 with the serial number of r+1, the conductor slot 810 with the serial number of r+2, and the conductor slot 810 with the serial number of r+3, and the conductor slot 810 with the serial number of s is connected to the conductor slot 810 with the serial number of s+1, the conductor slot 810 with the serial number of s+2, and the conductor slot 810 with the serial number of s+3. Figure 4 As shown in FIG. 8, the conductor slot 810 with the serial number of r is connected to the conductor slot 810 with the serial number of r+1, the conductor slot 810 with the serial number of r+2, and the conductor slot 810 with the serial number of r+3, and the conductor slot 810 with the serial number of s is connected to the conductor slot 810 with the serial number of s+1, the conductor slot 810 with the serial number of s+2, and the conductor slot 810 with the serial number of s+3.

[0033] As shown in FIG. 8, the conductor slot 810 with the serial number of r is connected to the conductor slot 810 with the serial number of r+1, the conductor slot 810 with the serial number of r+2, and the conductor slot 810 with the serial number of r+3, and the conductor slot 810 with the serial number of s is connected to the conductor slot 810 with the serial number of s+1, the conductor slot 810 with the serial number of s+2, and the conductor slot 810 with the serial number of s+3. Figure 3 As shown in FIG. 8, the conductor slot 810 with the serial number of r is connected to the conductor slot 810 with the serial number of r+1, the conductor slot 810 with the serial number of r+2, and the conductor slot 810 with the serial number of r+3, and the conductor slot 810 with the serial number of s is connected to the conductor slot 810 with the serial number of s+1, the conductor slot 810 with the serial number of s+2, and the conductor slot 810 with the serial number of s+3.

[0034] It is easy to see that the entry positions of the 3n winding branches in the three phases are all located within the range corresponding to the conductor slots 810 with serial numbers r and [r+(n-2)+2Z / 3p]. Among them, the entry positions of the 3(n-1) winding branches in the three phases are respectively serial numbers r, r+1...[r+(n-2)], r+Z / 3p, r+1+Z / 3p...[r+(n-2)+Z / 3p], r+2Z / 3p, r+1 ... The conductor slot 810 with serial number m+1 of +2Z / 3p……[r+(n-2)+2Z / 3p] is the outermost layer of the stator core 800; the incoming positions of the three winding branches in the three phases are the conductor slot 810 with serial number 2 of serial number [r+(n-2)], [r+(n-2)+Z / 3p] and [r+(n-2)+2Z / 3p], which are the inner side of the stator core 800.

[0035] like Figure 3 As shown, the winding structure may also include phase copper busbars 100, which can correspond one-to-one with the three phases of the stator assembly, i.e., there can be three phase copper busbars 100; the phase copper busbars 100 are connected to the input positions of the n winding branches of their corresponding phases. In other words, the first phase copper busbar 100 can be set within the range corresponding to the conductor slots 810 with serial numbers r, r+1...[r+(n-2)]...r+Z / 3p, and is set between the outermost and innermost positions of the consecutive n-1 conductor slots 810. Similarly, the second phase copper busbar 100 can be set within the range corresponding to the conductor slots 810 with serial numbers r+Z / 3p, r+1+Z / 3p...[r+(n-2)+Z / 3p] and can be set between the outermost and the innermost positions. The third phase copper busbar 100 can be set within the range corresponding to the conductor slots 810 with serial numbers r+2Z / 3p, r+1+2Z / 3p...[r+(n-2)+2Z / 3p] and can be set between the outermost and the innermost positions.

[0036] Based on this, the three phase copper busbars 100 all have relatively simple structures and relatively small spans along the circumferential direction. At the same time, since the three phase copper busbars 100 are also located within the range corresponding to the conductor slots 810 with serial numbers r and [r+(n-2)+2Z / 3p], the three phase copper busbars 100 also have relatively small spans when fixed together by the plastic coating material.

[0037] In the three phase, 3n winding branches are arranged, and the outgoing positions of 3(n-1) winding branches are arranged in the range corresponding to the conductor slots 810 with serial numbers s and [s+(n-2)+2Z / 3p] and are arranged in the slot layer with serial number m+1 of the conductor slots 810, i.e. the outermost side of the stator core 800; and the outgoing positions of the other three winding branches are arranged in the range corresponding to the conductor slots 810 with serial numbers t and t+2Z / 3p and are arranged in the slot layer with serial number 1 of the conductor slots 810, i.e. the innermost side of the stator core 800.

[0038] As shown in FIG. 6, the winding structure can further include a star point copper bar 200, and the star point copper bar 200 can be arranged in two to correspond to the outgoing positions of the n-1 winding branches of each phase and the outgoing positions of the other winding branch of each phase. One star point copper bar 200 can be connected to the outgoing positions of the n-1 winding branches of each phase, i.e. the star point copper bar 200 can be arranged in the range corresponding to the conductor slots 810 with serial numbers s and [s+(n-2)+2Z / 3p] and can be arranged at the outermost side; and the other star point copper bar 200 can be connected to the outgoing positions of the other winding branch of each phase, i.e. the star point copper bar 200 can be arranged in the range corresponding to the conductor slots 810 with serial numbers t and t+2Z / 3p and can be arranged close to the innermost side. Figure 3 Based on this, the two star point copper bars 200 have relatively simple structures and relatively small circumferential spans. At the same time, since the number of conductor slots 810 between the conductor slot 810 with serial number r and the conductor slot 810 with serial number s is not less than Z / 3p+n-1, the number of conductor slots 810 between the conductor slot 810 with serial number [r+(n-2)+2Z / 3p] and the conductor slot 810 with serial number s is not less than 0; that is, when the three phase copper bars 100 are fixed together, the star point copper bar 200 connected to the outgoing positions of the n-1 winding branches of each phase does not overlap circumferentially although it is arranged at the outermost side. When the three phase copper bars 100 are connected together, even if the star point copper bar 200 connected to the outgoing positions of the other winding branch of each phase overlaps circumferentially, the star point copper bar 200 is arranged close to the innermost side, and the star point copper bar 200 only crosses the three phase copper bars 100 close to the innermost side, and the crossing position is close to the incoming position of the other winding branch of each phase.

[0039]

[0040] ​In the two star point copper bars 200, the circumferential span of one star point copper bar 200 connected to the outgoing position of n-1 winding branches of each phase is larger, and the circumferential span of the other star point copper bar 200 connected to the outgoing position of one winding branch of each phase is smaller. When the foregoing copper bars are prepared into a busbar assembly through a plastic packaging material, since the one star point copper bar 200 with a larger circumferential span is not circumferentially overlapped with the three phase copper bars 100, it can be individually insulated through the plastic packaging material. The one star point copper bar 200 with a smaller circumferential span can be overlapped with or arranged close to the three phase copper bars 100, and it can be fixed with the three phase copper bars 100 through the plastic packaging material; when fixed, the connection points of the busbar assembly and the winding circuits of the three phases are simultaneously arranged at the outermost side and close to the innermost side, the connected busbar assembly is uniformly stressed, and the risk of fracture of the connection points is smaller. It is not difficult to see that the busbar assembly in the embodiment can be arranged as two, and the two busbar assemblies are circumferentially spaced apart and relatively independent and do not interfere with each other.

[0041] In summary, when the winding structure is an odd number of layers and multi-branch, the application sets the incoming wire position of n-1 winding branches of each phase of the winding structure to the slot layer with the serial number of m+1 of the continuous n-1 conductor slots 810 with the serial numbers of r, r+1,..., [r+(n-2)], and the outgoing wire position to the slot layer with the serial number of m+1 of the continuous n-1 conductor slots 810 with the serial numbers of s, s+1,..., [s+(n-2)], and sets the number of conductor slots 810 between the conductor slot 810 with the serial number of r and the conductor slot 810 with the serial number of s to be not less than Z / 3p+n-1; at the same time, the incoming wire position of the other winding branch is set to the slot layer with the serial number of 2 of the conductor slot 810 with the serial number of r+(n-2), and the outgoing wire position is set to the slot layer with the serial number of 1 of the conductor slot 810 with the serial number of "t"; and the phase copper bars 100 are one-to-one corresponding to the three phases of the stator assembly, and the incoming wire positions of the n winding branches of the corresponding phase are connected, and the star point copper bars 200 are set to two, and the incoming wire positions of the n-1 winding branches of each phase are connected to one star point copper bar 200, and the outgoing wire positions of the other winding branch of each phase are connected to the other star point copper bar 200, so that the three phase copper bars 100 and the two phase copper bars 100 both have relatively simple structures and relatively small spans in the circumferential direction; at the same time, the three phase copper bars 100 also have relatively small spans when fixed together by the plastic material, and the star point copper bar 200 with a relatively large span does not overlap the three phase copper bars 100 fixed together in the circumferential direction, and when the star point copper bar 200 with a relatively small span overlaps the three phase copper bars 100 fixed together, there is only relatively little intersection, and thus the application can realize the concentrated incoming and outgoing wires of the odd number of layers and multi-branch winding structure, so that the phase copper bars 100 and the star point copper bars 200 have relatively simple structures, so as not to be easily failed due to vibration when the phase copper bars 100 and the star point copper bars 200 are prepared as a busbar assembly.

[0042] Specifically, any winding branch includes an effective part 910 arranged in the conductor slot 810, a first extension part 920 arranged at one end of the effective part 910, and a second extension part 930 arranged at the other end of the effective part 910, and any winding branch is wound in a cycle of the first extension part 920, the effective part 910, the second extension part 930, the effective part 910, and the first extension part 920 in turn and until the first extension part 920 is wound.

[0043] As Figure 3 and Figure 4As shown, in the embodiment, it is exemplarily illustrated that according to the foregoing, any winding branch can be wound by a conductor. During winding, the conductor can be partially wound at one end of the stator core 800 to form an effective portion 910, each effective portion 910 corresponds to one slot layer of the conductor slot 810; and the conductor can be partially wound in the conductor slot 810 of the stator core 800 to form a first extension portion 920; and the conductor can be partially wound at the other end of the stator core 800 to form a second extension portion 930. Based on this, the first extension portion 920 and the second extension portion 930 can be arranged on both sides of the effective portion 910. During the winding process of any winding branch, the conductor can be wound in a cycle of the first extension portion 920, the effective portion 910, the second extension portion 930, the effective portion 910, and the first extension portion 920 in sequence, and the winding is completed by the first extension portion 920. It is not difficult to see that when the winding lines of the three phases are wound, the first extension portion 920 is located at the same end of the stator core 800, and the second extension portion 930 is located at the other end of the stator core 800.

[0044] It can be understood that the embodiment can obtain the required three-phase winding lines by reasonably arranging the structure and winding sequence of any winding branch.

[0045] More specifically, the first extension portion 920 of the n-1 winding branches at the incoming position and the first extension portion 920 of the n-1 winding branches at the outgoing position are extended along the same side of the circumference, and the extension directions of the first extension portion 920 at the incoming position and the first extension portion 920 at the outgoing position of the n-1 winding branches are the same side of the circumference. The first extension portion 920 at the incoming position of the other winding branch is extended along the same side of the circumference as the first extension portion 920 at the incoming position of the n-1 winding branches, and the first extension portion 920 at the outgoing position of the other winding branch is extended along the other side of the circumference to be close to the first extension portion 920 at the incoming position.

[0046] As Figure 4As shown in this embodiment, for any phase, the effective portion 910 of the n-1 winding branch entry positions is wound within the m+1 slot layer of n-1 consecutive conductor slots 810 numbered r, r+1...[r+(n-2)]. The first extension portion 920 of the entry position is disposed at one end of the effective portion 910 and extends obliquely; during extension, the first extension portions 920 of the n-1 winding branch entry positions all extend along the same side in the circumferential direction. Similarly, for another winding branch, the effective portion of its entry position is wound within the 2nd slot layer of the r+(n-2) conductor slots 810, and the first extension portion 920 of the entry position is disposed at one end of the effective portion 910 and extends obliquely. During extension, the first extension portion 920 of the other winding branch entry position extends along the same side in the circumferential direction as the first extension portions 920 of the n-1 winding branch entry positions.

[0047] It is easy to see that when the phase copper busbar 100 is connected to the input positions of all n winding branches of its corresponding phase, the phase copper busbar 100 is specifically connected to the first extension portion 920 of the input positions of all n winding branches. By extending the first extension portions 920 of the input positions of n-1 winding branches along the same side of the circumference, and extending the first extension portion 920 of the input position of another winding branch along the same side of the circumference as the first extension portion 920 of the input positions of n-1 winding branches, the first extension portions 920 of the input positions of the n winding branches can be made closer together, thereby reducing the circumferential span of the phase copper busbar 100.

[0048] like Figure 4 As shown, in this embodiment, for any phase, the effective portion 910 of the n-1 winding branch exit positions is wound within the m+1 slot layer of consecutive n-1 conductor slots 810 numbered s, s+1...[s+(n-2)]. The first extension portion 920 of the exit position is disposed at one end of the effective portion 910 and extends obliquely; during extension, the first extension portions 920 of the n-1 winding branch exit positions all extend along the same side of the circumference, and the first extension portions 920 of the n-1 winding branch exit positions and the first extension portions 920 of the inlet positions all extend along the same side of the circumference. Similarly, for the other winding branch, the effective portion of its exit position is wound within the slot layer of conductor slot 810 numbered 1 of t, and the first extension portion 920 of the exit position is disposed at one end of the effective portion 910 and extends obliquely. When extending, the first extension portion 920 at the exit position of the other winding branch extends along the other side of the circumference, that is, opposite to the first extension portion 920 at the inlet position. Based on this, the first extension portion 920 at the exit position of the other winding branch is positioned close to the first extension portion 920 at the inlet position.

[0049] As can be seen, when the star point copper bar 200 is connected to the outgoing line positions of the n-1 winding branches of each phase or connected to the outgoing line positions of the other winding branch of each phase, the star point copper bar 200 is specifically connected to the first extension part 920 of the outgoing line positions of the n-1 winding branches of each phase or connected to the first extension part 920 of the outgoing line positions of the other winding branch of each phase. By extending the first extension part 920 of the outgoing line positions of the n-1 winding branches of each phase along the same side in the circumferential direction, the first extension part 920 of the outgoing line positions of the n-1 winding branches of each phase can be made closer to reduce the circumferential span of the star point copper bar 200 connected to the outgoing line positions of the n-1 winding branches of each phase. By setting the extension direction of the first extension part 920 of the incoming line positions of the n-1 winding branches and the first extension part 920 of the outgoing line positions to the same side in the circumferential direction, the first extension part 920 of the incoming line positions of the n-1 winding branches can be less likely to cross the first extension part 920 of the outgoing line positions to make the structure of the phase copper bar 100 or the star point copper bar 200 connected to the outgoing line positions of the n-1 winding branches of each phase complex.

[0050] Further, by extending the first extension part 920 of the outgoing line positions of the other winding branch of each phase along the other side in the circumferential direction, the first extension part 920 of the outgoing line positions of the other winding branch of each phase can be made closer to reduce the circumferential span of the star point copper bar 200 connected to the outgoing line positions of the other winding branch of each phase. At the same time, by extending the first extension part 920 of the outgoing line positions of the other winding branch of each phase along the other side in the circumferential direction, the first extension part 920 of the outgoing line positions of the other winding branch of each phase can be close to the first extension part 920 of the incoming line positions of the n winding branches of each phase, and further to make the star point copper bar 200 connected to the outgoing line positions of the other winding branch of each phase have a larger span in the circumferential direction when overlapping with the three phase copper bars 100 in the circumferential direction. Correspondingly, when the star point copper bar 200 is fixed with the three phase copper bars 100 by the plastic material to form a busbar assembly, the busbar assembly has a relatively small span in the circumferential direction.

[0051] It can be understood that by reasonably setting the extension direction of the first extension part 920 of the incoming line positions of the n winding branches of each phase and the first extension part 920 of the outgoing line positions, the concentration of the winding structure can be further improved, and further to make the busbar assembly less likely to fail due to vibration when the three phase copper bars 100 and the star point copper bar 200 are prepared as a busbar assembly.

[0052] Specifically, any winding branch includes an incoming line 300, an outgoing line 400, a lap winding coil 500, a cross winding coil 600 and a reverse twisting coil 700, the incoming line 300 includes an incoming effective edge 310 serving as an effective part 910, an incoming card end 320 serving as a first extension part 920 and an incoming welding end 330 serving as a second extension part 930, the incoming effective edge 310 is provided as one, and the incoming card end 320 and the incoming welding end 330 are respectively arranged on both sides of the incoming effective edge 310; The outgoing line 400 includes an outgoing effective edge 410 serving as an effective part 910, an outgoing card end 420 serving as a first extension part 920 and an outgoing welding end 430 serving as a second extension part 930, the outgoing effective edge 410 is provided as one, and the outgoing card end 420 and the outgoing welding end 430 are respectively arranged on both sides of the outgoing effective edge 410; The lap winding coil 500 includes a lap effective edge 510 serving as an effective part 910, a lap card end 520 serving as a first extension part 920 and a lap welding end 530 serving as a second extension part 930, the lap effective edge 510 is provided as two, the lap welding end 530 corresponds to the lap effective edge 510 one by one and is respectively connected with the same end of the two lap effective edges 510, the two lap welding ends 530 extend in a direction of approaching each other, and the lap card end 520 connects the other end of the two lap effective edges 510; The cross winding coil 600 includes a cross effective edge 610 serving as an effective part 910, a cross card end 620 serving as a first extension part 920 and a cross welding end 630 serving as a second extension part 930, the cross effective edge 610 is provided as two, the cross welding end 630 corresponds to the cross effective edge 610 one by one and is respectively connected with the same end of the two cross effective edges 610, the two cross welding ends 630 extend in the same direction, and the cross card end 620 connects the other end of the two cross effective edges 610; The reverse twisting coil 700 includes a reverse twisting effective edge 710 serving as an effective part 910, a reverse twisting card end 720 serving as a first extension part 920 and a reverse twisting welding end 730 serving as a second extension part 930, the reverse twisting effective edge 710 is provided as two, the reverse twisting welding end 730 corresponds to the reverse twisting effective edge 710 one by one and is respectively connected with the same end of the two reverse twisting effective edges 710, the two reverse twisting welding ends 730 extend in the same direction, and the reverse twisting card end 720 connects the other end of the two reverse twisting effective edges 710.

[0053] As Figures 4-9As shown in this embodiment, the conductor can be exemplarily described as a coil, wound in a slot within the conductor slot 810 of the stator core 800. The coil is typically integrally formed, and coils are usually connected by welding. Depending on the shape and type of the coil, the coil used in any winding branch during the winding process may include a lead wire 300, a lead wire 400, a lapped coil 500, a crossover coil 600, and a reverse-twist coil 700.

[0054] like Figure 5 As shown, the lead-in wire 300 may include an effective lead-in edge 310, a hairpin lead-in end 320, and a solder lead-in end 330. The effective lead-in edge 310 can be used as an effective portion 910 and wound within a groove layer of the conductor groove 810. The effective lead-in edge 310 can be configured as a single edge. The hairpin lead-in end 320 can be used as a first extension portion 920, and the solder lead-in end 330 can be used as a second extension portion 930. The hairpin lead-in end 320 and the solder lead-in end 330 can be respectively disposed on both sides of the effective lead-in edge 310. Since the lead-in wire 300 includes only one effective edge and has a shape similar to an "I", it can be called an "I"-shaped coil.

[0055] like Figure 6 As shown, the lead wire 400 may include an effective lead edge 410, a lead-out clip end 420, and a lead-out soldering end 430. Similarly, the effective lead edge 410 can be used as an effective portion 910 and wound within a groove layer of the conductor groove 810. The effective lead edge 410 can be configured as a single line. The lead-out clip end 420 can be used as a first extension, and the lead-out soldering end 430 can be used as a second extension 930. The lead-out clip end 420 and the lead-out soldering end 430 can be respectively located on both sides of the effective lead edge 410. Likewise, the lead wire 400 can be referred to as an "I"-shaped coil.

[0056] like Figure 7As shown, the lapped coil 500 may include an effective lapped edge 510, a lapped hairpin end 520, and a lapped solder end 530. The effective lapped edge 510 can be used as an effective portion 910 and wound within one groove layer of the conductor groove 810. Two effective lapped edges 510 can be provided, each wound within one of the two conductor grooves 810. The lapped solder end 530 can be used as a first extension portion 920. The lapped solder end can correspond one-to-one with the effective lapped edge 510 and be connected to the same end of each of the two effective lapped edges 510. The two lapped solder ends 530 can extend in a direction close to each other to facilitate lapping. The lapped hairpin end 520 can be used as a second extension portion 930. The lapped hairpin end 520 can connect to the other end of the two effective lapped edges 510 and can be configured in a V-shape. Since the lapped coil 500 has two effective sides and is shaped like a "U", it can be called a "U" shaped coil; and the number of conductor slots 810 between the two effective sides of the "U" shaped coil can be called the pitch of the "U" shaped coil.

[0057] like Figure 8 As shown, the crossover coil 600 may include a crossover effective side 610, a crossover hairpin end 620, and a soldering end. The crossover effective side 610 can be used as an effective portion 910 and wound within one slot layer of the conductor groove 810. Two crossover effective sides 610 can be provided, each wound within a different conductor groove 810. The crossover soldering end 630 can be used as a first extension portion 920. The soldering segment can correspond one-to-one with the crossover effective side 610 and connect to the same end of each of the two crossover effective sides 610. The two soldering ends 630 can extend in the same direction to facilitate crossover in the same layer. The crossover hairpin end 620 can be used as a second extension portion 930. The hairpin end 620 can connect to the other end of the two crossover effective sides 610 and can also be configured in a V-shape. Similarly, the crossover coil 600 can also be called a U-shaped coil.

[0058] like Figure 9As shown, the anti-twist coil 700 may include an effective anti-twist side 710, an anti-twist hairpin end 720, and an anti-twist solder end 730. The effective anti-twist side 710 can be used as an effective portion 910 and wound in one slot layer of the conductor groove 810. Two effective anti-twist sides 710 can be provided, each wound in one of two conductor grooves 810. The anti-twist solder end 730 can be used as a first extension portion 920. The anti-twist solder segment can correspond one-to-one with the effective anti-twist side 710 and connect to the same end of each of the two effective anti-twist sides 710. The two anti-twist solder ends 730 can extend in the same direction to facilitate anti-twist. The anti-twist hairpin end 720 can be used as a second extension portion 930. The anti-twist hairpin end 720 can connect to the other end of the two overlapping effective sides 510. The anti-twist hairpin end 720 can also be configured in a V-shaped form. Similarly, the anti-twist coil 700 can also be called a U-shaped coil.

[0059] It is understood that this embodiment facilitates the completion of winding the winding branch to obtain the winding structure by reasonably setting the coil shape and type of any winding branch.

[0060] More specifically, the effective lead-in edge 310 of the lead-in wire 300 is wound in the slot layer numbered m+1 or 2, and the lead-in wire 300 is used as the entry position of the winding branch; the effective lead-out edge 410 of the lead-out wire 400 is wound in the slot layer numbered m+1 or 1, and the lead-out wire 400 is used as the exit position of the winding branch; the two effective overlapping edges 510 of the overlapping coil 500 are wound in the slot layers numbered 1 and 2, or in the slot layers numbered 3 and 4, ... or in the slot layers numbered m-1 and m; the two effective overlapping edges 510 of the cross-wire coil 600 are wound in the slot layers numbered m+1 and m+1, respectively; and the two effective anti-twist edges 710 of the anti-twist coil 700 are wound in the slot layers numbered 1 and 2, respectively.

[0061] like Figure 4 As shown in this embodiment, it is illustrated by way of example that any winding branch can use the lead-in line 300 as the first coil at the lead-in position. Therefore, in any n-1 winding branches of any phase, the effective lead-in edge 310 of the lead-in line 300 can be wound in the slot layer with the sequence number m+1 of a conductor slot 810; while in another winding branch of any phase, the effective lead-in edge 310 of the lead-in line 300 can be wound in the slot layer with the sequence number 2 of a conductor slot 810.

[0062] And the last coil of any winding branch can be wound in the outgoing line 400 as the outgoing position, so in the n-1 winding branches of any phase, the outgoing effective edge 410 of the outgoing line 400 can be wound in the slot layer with the serial number of m+1 of one conductor slot 810; and in the other winding branch of any phase, the outgoing effective edge 410 of the outgoing line 400 can be wound in the slot layer with the serial number of 1 of one conductor slot 810.

[0063] In the embodiment, any winding branch can be wound in the lap winding coil 500, and the lap winding coil 500 can be divided into m / 2 kinds according to the different slot layer positions of the two lap winding effective edges 510 wound in the conductor slot 810, and the two lap winding effective edges 510 of the m / 2 kinds of lap winding coils 500 can be wound in the slot layer with the serial number of 1 of one conductor slot 810 and the slot layer with the serial number of 2 of another conductor slot 810, or can be wound in the slot layer with the serial number of 3 of one conductor slot 810 and the slot layer with the serial number of 4 of another conductor slot 810, or can be wound in the slot layer with the serial number of m-1 of one conductor slot 810 and the slot layer with the serial number of m of another conductor slot 810.

[0064] And any winding branch can be wound in the cross-line coil 600 in the same layer, and the two lap winding effective edges 510 of the cross-line coil 600 can be wound in the slot layer with the serial number of m+1 of one conductor slot 810 and the slot layer with the serial number of m+1 of another conductor slot 810.

[0065] Any winding branch can be wound in the reverse-twisted coil 700, and the two reverse-twisted effective edges 710 of the reverse-twisted coil 700 can be wound in the slot layer with the serial number of 1 of one conductor slot 810 and the slot layer with the serial number of 2 of another conductor slot 810.

[0066] It can be understood that the slot layer positions of the incoming line 300, the outgoing line 400, the lap winding coil 500, the cross-line coil 600 and the reverse-twisted coil 700 of any winding branch wound in the conductor slot 810 are reasonably set, so as to facilitate the winding of the required winding structure.

[0067] More specifically, the pitches of the lap winding coils 500 wound in the same slot layer are equal, the pitches of the cross-line coils 600 are set to two kinds, and the pitches of the reverse-twisted coils 700 are equal.

[0068] As Figure 4As shown, in the present embodiment, it is exemplarily illustrated that the number of conductor slots 810 spaced between the two effective edges of the "U" shaped coil is the pitch of the "U" shaped coil according to the foregoing. For the lap wound coil 500, the pitches of the lap wound coil 500 in which the two lap wound effective edges 510 are wound in the same slot layer can be set to be equal, for example, the pitches of the lap wound coil 500 in which the two lap wound effective edges 510 are wound in the slot layer with serial number 1 and the slot layer with serial number 2 are equal, and the pitches of the lap wound coil 500 in which the two lap wound effective edges 510 are wound in the slot layer with serial number 3 and the slot layer with serial number 4 are equal. Meanwhile, the pitches of the crossover coil 600 can be set to be two kinds, for example, the pitch of one lap wound coil 500 is 10 slots, and the pitch of another lap wound coil 500 is 7 slots. The pitches of the counter-wound coil 700 can also be set to be equal.

[0069] It can be understood that, by setting the pitches of the lap wound coil 500 wound in the same slot layer to be equal, setting the pitches of the crossover coil 600 to be two kinds, and setting the pitches of the counter-wound coil 700 to be equal, the present embodiment can simplify the types and kinds of coils in the winding structure, thereby facilitating winding.

[0070] More specifically, p = 4, Z = 72, m = 6, n = 4, the three phases of the stator assembly are U phase, V phase and W phase, wherein the winding route of the first winding branch of the U phase is: 1.7-10.6-1.5-10.4-1.3-10.2-1.1-10.1-19.2-10.3-19.4-10.5-19.6-10.7-20.7-29.6-20.5-29.4-20.3-29.2-20.1-29.1-38.2-29.3-38.4-29.5-38.6-29.7-39.7-48.6-39.5-48.4-39.3-48.2-39.1-48.1-57.2-48.3-57.4-48.5-57.6-48.7; The winding route of the second winding branch of the U phase is: 2.7-11.6-2.5-11.4-2.3-11.2-2.1-11.1-20.2-11.3-20.4-11.5-20.6-11.7-21.7-30.6-21.5-30.4-21.3-30.2-21.1-30.1-39.2-30.3-39.4-30.5-39.6-30.7-37.7-46.6-37.5-46.4-37.3-46.2-37.1-46.1-55.2-46.3-55.4-46.5-55.6-46.7; The winding route of the third winding branch of the U phase is: 3.7-12.6-3.5-12.4-3.3-12.2-3.1-12.1-21.2-12.3-21.4-12.5-21.6-12.7-19.7-28.6-19.5-28.4-19.3-28.2-19.1-28.1-37.2-28.3-37.4-28.5-37.6-28.7-38.7-47.6-38.5-47.4-38.3-47.2-38.1-47.1-56.2-47.3-56.4-47.5-56.6-47.7; The winding path of the fourth winding branch of phase U is as follows: 3.2-66.3-3.4-66.5-3.6-66.7-56.7-65.6-56.5-65.4-56.3-65.2-56.1-65.1-2.2-65.3-2.4-65.5-2.6-65.7-55.7-64.6-55.5-64.4-55.3-64.2-55.1-64.1-1.2-64.3-1.4-64.5-1.6-64.7-57.7-66.6-57.5-66.4-57.3-66.2-57.1-66.1.

[0071] In this embodiment, by way of example, the odd-layer multi-branch winding structure can specifically be a 72-slot, 8-pole, 7-layer winding structure with 4 branches, where p=4, Z=72, m=6, and n=4. The three phases of the stator assembly can be phase U, phase V, and phase W, where "U," "V," and "W" are merely for describing the three phases of the stator assembly and are not intended to limit the stator assembly in any way. In some embodiments, the three phases of the stator assembly can also be represented by other designations.

[0072] The following explanation uses the winding circuit of the U-phase as an example.

[0073] In the first winding branch of phase U, the line indicated by "1.7" is the lead-in line 300, whose effective lead-in edge 310 is wound in the slot layer of the conductor slot 810 with the sequence number 1, referring to... Figure 4 U1 in the middle.

[0074] The circuit represented by "10.6-1.5" is the first lap-wound coil 500, whose two effective lap-wound edges 510 are wound in slot 6 of conductor slot 810 (number 10) and slot 5 of conductor slot 810 (number 1), with a pitch of 9 slots. Similarly, the circuit represented by "10.4-1.3" is the second lap-wound coil 500, whose two effective lap-wound edges 510 are wound in slot 4 of conductor slot 810 (number 10) and slot 3 of conductor slot 810 (number 1), with a pitch of 9 slots.

[0075] In the subsequent circuit, the circuit represented by "10.1-19.2" is the first anti-twist coil 700, whose two effective anti-twist sides 710 are wound in slot 1 of conductor slot 810 (number 10) and slot 2 of conductor slot 810 (number 19), respectively, with a pitch of 9 slots. The first winding branch of phase U also includes two other anti-twist coils 700, represented by the circuits "29.1-38.2" and "48.1-57.2", respectively, and these two anti-twist coils 700 also have a pitch of 9 slots.

[0076] The circuit represented by "10.7-20.7" is the first crossover coil 600, whose two effective crossover edges 610 are wound in slot 7 of conductor slot 810 (serial number 10) and slot 7 of conductor slot 810 (serial number 20), respectively, with a pitch of 10 slots. The first winding branch of phase U also includes another crossover coil 600, represented by "29.7-39.7". This lapped coil 500 also has a pitch of 10 slots. That is, the first winding branch of phase U only includes crossover coils 600 with one pitch.

[0077] The line indicated by "48.7" is lead-out line 400, whose effective lead-out edge 410 is wound within the slot layer numbered 7 of conductor slot 810 (serial number 48). (Refer to...) Figure 4 X1 in the middle.

[0078] The second and third winding branches of phase U are similar to the first winding branch of phase U.

[0079] In the second winding branch of phase U, "2.7" indicates the lead-in line 300, referencing... Figure 4U2. "11.1-20.2", "30.1-39.2" and "46.1-55.2" represent the wire of the reverse-twisted coil 700, and the pitch of each is 9 slots. "11.7-21.7" and "30.7-37.7" represent the wire of the cross-over coil 600, and the pitch of each is 10 slots and 7 slots, respectively, i.e., the second winding branch of the U-phase includes the cross-over coil 600 of two pitches. "46.7" represents the wire of the lead-out wire 400, which is described with reference to X2 in FIG. 46. Figure 4

[0080] In the third winding branch of the U-phase, "3.7" represents the wire of the lead-in wire 300, which is described with reference to U3 in FIG. 3. Figure 4 "12.1-21.2", "28.1-37.2" and "47.1-56.2" represent the wire of the reverse-twisted coil 700, and the pitch of each is 9 slots. "12.7-19.7" and "28.7-38.7" represent the wire of the cross-over coil 600, and the pitch of each is 7 slots and 10 slots, respectively, i.e., the third winding branch of the U-phase also includes the cross-over coil 600 of two pitches. "47.7" represents the wire of the lead-out wire 400, which is described with reference to X3 in FIG. 47. Figure 4

[0081] In the fourth winding branch of the U-phase, "3.2" represents the wire of the lead-in wire 300, which is described with reference to U4 in FIG. 3. Figure 4

[0082] "66.7-56.7", "65.7-55.7" and "64.7-57.7" represent the wire of the cross-over coil 600, and the pitch of each is 10 slots, 10 slots and 7 slots, respectively, i.e., the fourth winding branch of the U-phase also includes the cross-over coil 600 of two pitches. "65.1-2.2" and "64.1-1.2" represent the wire of the reverse-twisted coil 700, and the pitch of each is 9 slots.

[0083] "66.1" represents the wire of the lead-out wire 400, which is described with reference to X4 in FIG. 66. Figure 4

[0084] ​​​​In summary, the incoming wire positions of the first, second and third winding branches of the U phase are the slot layer No. 7 of the conductor slot 810 with serial numbers 1, 2 and 3, respectively, and the outgoing wire positions are the slot layer No. 7 of the conductor slot 810 with serial numbers 46, 47 and 48, respectively, i.e. r = 1, s = 46. The incoming wire position of the fourth winding branch of the U phase is the slot layer No. 2 of the conductor slot 810 with serial number 3, and the outgoing wire position is the slot layer No. 1 of the conductor slot 810 with serial number 66, i.e. t = 66.

[0085] As can be seen, the number of conductor slots 810 between the conductor slot 810 with serial number r = 1 and the conductor slot 810 with serial number s = 46 should be (1 + 72) - 46 - 1 = 26, which is not less than Z / 3p + n - 1 = 72 / 3 x 4 + 4 - 1 = 15 and less than Z / 2 = 36.

[0086] The winding lines of the V phase and the winding lines of the W phase can be obtained by sequentially translating the winding lines of the U phase by Z / 3p = 72 / (3 x 4) = 6 and 2Z / 3p = 2 x 72 / 3 x 4 = 12 conductor slots 810 in the direction of increasing serial numbers of the conductor slots 810.

[0087] Based on this, the incoming wire positions of the first, second and third winding branches of the V phase are the slot layer No. 7 of the conductor slots 810 with serial numbers 7, 8 and 9, respectively, referring to V1, V2 and V3 in Figure 3 ; and the outgoing wire positions of the first, second and third winding branches of the V phase are the slot layer No. 7 of the conductor slots 810 with serial numbers 52, 53 and 54, respectively, referring to Y1, Y2 and Y3 in Figure 3 . The incoming wire position of the fourth winding branch of the V phase is the slot layer No. 2 of the conductor slot 810 with serial number 9, referring to V4 in Figure 3 ; and the outgoing wire position of the fourth winding branch of the V phase is the slot layer No. 1 of the conductor slot 810 with serial number 72, referring to Y4 in Figure 3 .

[0088] The incoming wire positions of the first, second and third winding branches of the W phase are the slot layer No. 7 of the conductor slots 810 with serial numbers 13, 14 and 15, respectively, referring to W1, W2 and W3 in Figure 3 ; and the outgoing wire positions of the first, second and third winding branches of the W phase are the slot layer No. 7 of the conductor slots 810 with serial numbers 58, 59 and 60, respectively, referring to Z1, Z2 and Z3 in Figure 3 . The incoming wire position of the fourth winding branch of the W phase is the slot layer No. 2 of the conductor slot 810 with serial number 15, referring to W4 in Figure 3 ; and the outgoing wire position of the fourth winding branch of the W phase is the slot layer No. 1 of the conductor slot 810 with serial number 6, referring to Z4 in Figure 3 .

[0089] As shown in Figure 3 Fig. 1, it can be seen that since the incoming wire positions of the four winding branches of the U phase are conductor grooves 810 with serial numbers 1, 2 and 3, the U phase phase copper bar 100 can be arranged in the range corresponding to the conductor grooves 810 with serial numbers 1, 2 and 3, and can be arranged between the outermost position and the position close to the innermost position only at the conductor groove 810 with serial number 3.

[0090] Since the incoming wire positions of the four winding branches of the V phase are conductor grooves 810 with serial numbers 7, 8 and 9, the V phase phase copper bar 100 can be arranged in the range corresponding to the conductor grooves 810 with serial numbers 7, 8 and 9, and can be arranged between the outermost position and the position close to the innermost position only at the conductor groove 810 with serial number 9.

[0091] Since the incoming wire positions of the four winding branches of the W phase are conductor grooves 810 with serial numbers 13, 14 and 15, the W phase phase copper bar 100 can be arranged in the range corresponding to the conductor grooves 810 with serial numbers 13, 14 and 15, and can be arranged between the outermost position and the position close to the innermost position only at the conductor groove 810 with serial number 15.

[0092] Therefore, the U phase phase copper bar 100, the V phase phase copper bar 100 and the W phase phase copper bar 100 have relatively simple structures and relatively small circumferential spans.

[0093] At the same time, since the three phase copper bars 100 are also located in the range corresponding to the conductor grooves 810 with serial numbers 1 and 15, the three phase copper bars 100 also have a relatively small span, i.e. 75°, when fixed together by the plastic material.

[0094] Since the outgoing wire positions of the first, second and third winding branches of the U phase, V phase and W phase are conductor grooves 810 with serial numbers 46, 47, 48, 52, 53, 54, 58, 59 and 60, respectively, the first star point copper bar 200 can be arranged in the range corresponding to the conductor grooves 810 with serial numbers 46 and 60 and can be arranged at the outermost side of the stator core 800.

[0095] The outgoing wire positions of the fourth winding branches of the U phase, V phase and W phase are conductor grooves 810 with serial numbers 66, 72 and 6, respectively, so the second star point copper bar 200 can be arranged in the range corresponding to the conductor grooves 810 with serial numbers 66 and 6 and arranged close to the inner side.

[0096] Based on this, both star-point copper busbars 200 have relatively simple structures and relatively small spans along the circumference. The first star-point copper busbar 200 has a circumferential span of 75°, and the second star-point copper busbar 200 has a circumferential span of 60°. That is, the first star-point copper busbar 200 has a relatively large circumferential span, while the second star-point copper busbar 200 has a relatively small circumferential span. Furthermore, when the three phase copper busbars 100 are fixed together, although they and the first star-point copper busbar 200 are both located on the outermost side, they are separated by 12 conductor slots 810, and they do not overlap circumferentially. When the three phase copper busbars 100 are fixed together, even if the second star-point copper busbar 200 overlaps with it circumferentially, the second star-point copper busbar 200 is positioned closer to the innermost side. Furthermore, since the first extension 920 of the fourth winding branch of each of the three phases extends circumferentially on both sides, and since the span of the second star-point copper busbar 200 circumferentially is smaller than the span when fixed together, the second star-point copper busbar 200 can be arranged circumferentially within the range corresponding to the three phase copper busbars 100 fixed together. The second star-point copper busbar 200 intersects with the three phase copper busbars 100 only at the innermost position; in this case, the second star-point copper busbar 200 and the three phase copper busbars 100 can be offset vertically along the axial direction.

[0097] When the aforementioned copper busbars are fabricated into a busbar assembly using a plastic-coated material, the first phase copper busbar 100 can be individually coated with the plastic material for insulation and other arrangements. The second phase copper busbar 100 can be fixed integrally with the three phase copper busbars 100 using the plastic-coated material. In this case, two busbar assemblies are configured, with the two busbar assemblies having approximately the same circumferential span.

[0098] Specifically, the number of conductor slots 810 between the conductor slot 810 with serial number r and the conductor slot 810 with serial number s is equal to Z / 3+n-1.

[0099] like Figure 4 As shown in this embodiment, by way of example, n-1 winding branches of any phase can be mainly wound within 2Z / 3 consecutive conductor slots, while another winding branch can be mainly wound within Z / 3 conductor slots. Based on this, in the n-1 winding branches, the number of conductor slots 810 between the conductor slot 810 with serial number r and the conductor slot 810 with serial number s can preferably be Z / 3+n-1. With this number of conductor slots 810, the first phase copper busbar 100 can be spaced between itself and the three phase copper busbars 100 fixed together with a relatively large number of conductor slots 810, and the second phase copper busbar 100 can overlap the three phase copper busbars 100 fixed together with a relatively large amount, thereby facilitating the fabrication of two relatively independent busbar assemblies.

[0100] Taking r = 1, s = 46, Z = 72, n = 4 as an example, the number of the conductor grooves 810 between the conductor groove 810 with the serial number of r = 1 and the conductor groove 810 with the serial number of s = 46 is Z / 3 + n - 1 = 72 / 3 + 4 - 1 = 27 conductor grooves 810.

[0101] Specifically, the phase copper bar 100 includes the first copper bar body 110 and the first soldering terminal 120, the first soldering terminal 120 corresponds to the n winding branches one by one, and the first copper bar body 110 is connected to the n first soldering terminals 120.

[0102] As shown in the drawings, Figure 10 In this embodiment, it is exemplarily illustrated that the phase copper bar 100 can include the first copper bar body 110 and the first soldering terminal 120, and the first copper bar body 110 and the first soldering terminal 120 can be integrally formed. The first soldering terminal 120 can correspond to the n winding branches one by one, that is, the first soldering terminal 120 can be provided as n. The n first soldering terminals 120 can be respectively connected to the first extension part 920 at the incoming line position of the n winding branches of the phase, that is, connected to the incoming hairpin end 320 of the incoming line 300. The first soldering terminal 120 and the incoming hairpin end 320 can extend a small distance along the axial direction of the stator core 800, so as to facilitate welding. Among the n first soldering terminals 120, n-1 first soldering terminals 120 can be arranged on the inner side of the incoming hairpin end 320 in the radial direction, and the other first soldering terminal 120 can be arranged on the outer side of the incoming hairpin end 320 in the radial direction. One end of the first copper bar body 110 can extend in the circumferential direction to connect the n first soldering terminals 120. The other end of the first copper bar body 110 can extend outward to facilitate wiring.

[0103] It can be understood that the embodiment facilitates the connection of the phase copper bar 100 and the winding branches of the three phases by reasonably arranging the structure of the phase copper bar 100.

[0104] Specifically, the star point copper bar 200 includes the second copper bar body 210 and the second soldering terminal 220, the second soldering terminal 220 corresponds to the n-1 winding branches of each phase one by one or corresponds to the other winding branch of each phase one by one, and the second copper bar body 210 is connected to 3(n-1) second soldering terminals 220 or connected to 3 soldering terminals.

[0105] As shown in the drawings, Figure 10As shown, in the embodiment, it is exemplarily illustrated that the star point copper bar 200 can include the second copper bar body 210 and the second soldering terminal 220, and the second copper bar body 210 and the second soldering terminal 220 can also be integrally formed. The second soldering terminal 220 can correspond to the number of the winding branches of the three phases to which the second soldering terminal 220 needs to be connected, that is, the second soldering terminal 220 of the first star point copper bar 200 can be provided as 3(n-1), and the second soldering terminal 220 of the second star point copper bar 200 can be provided as 3. The 3(n-1) second soldering terminals 220 of the first star point copper bar 200 can be respectively connected with the first extension part 920 at the outgoing position of each phase n-1 winding branch, that is, connected with the outgoing soldering end 430 of the outgoing line 400. And the 3 second soldering terminals 220 of the second star point copper bar 200 can be respectively connected with the first extension part 920 at the outgoing position of each phase another winding branch. Similarly, the second soldering terminal 220 and the outgoing clamping end 420 can also extend a small distance along the axial direction of the stator core 800, so as to facilitate welding. The 3(n-1) second soldering terminals 220 of the first star point copper bar 200 can be provided on the outer side of the outgoing clamping end 420 in the radial direction, and the 3 second soldering terminals 220 of the second star point copper bar 200 can be provided on the inner side of the outgoing clamping end 420 in the radial direction. The second copper bar body 210 can also extend in the circumferential direction to connect the 3(n-1) or 3 second soldering terminals 220.

[0106] It can be understood that, by reasonably arranging the structure of the star point copper bar 200, the star point copper bar 200 is facilitated to be connected with the winding branches of the three phases.

[0107] The embodiment of the present application provides an implementation principle of the odd-layer multi-branch winding structure. During winding, the incoming line 300, the outgoing line 400, the lap winding coil 500, the cross-line coil 600 and the reverse-twisted coil 700 are respectively prepared into a shape, and then a plurality of the incoming line 300, the outgoing line 400, the lap winding coil 500, the cross-line coil 600 and the reverse-twisted coil 700 are respectively wound on the corresponding conductor slot 810 in a specified order, so as to wind the winding lines of the three phases on the stator core 800. Subsequently, the phase copper bar 100 and the star point copper bar 200 are prepared into a busbar assembly, and the prepared busbar assembly is connected with the winding lines of the three phases, so as to prepare the required winding structure.

[0108] When the winding structure is an odd-layer multi-branch winding structure, the application sets the wire-in positions of n-1 winding branches of each phase of the winding structure to the slot layer with the serial number of m+1 of the continuous n-1 conductor slots 810 and the wire-out positions to the slot layer with the serial number of s, s+1,..., [s+(n-2)] of the continuous n-1 conductor slots 810, and sets the number of conductor slots 810 between the conductor slot 810 with the serial number of r and the conductor slot 810 with the serial number of s to be not less than Z / 3p+n-1; at the same time, the wire-in position of another winding branch is set to the slot layer with the serial number of 2 of the conductor slot 810 with the serial number of r+(n-2) and the wire-out position is set to the slot layer with the serial number of 1 of the conductor slot 810 with the serial number of "t"; and the phase copper bars 100 are one-to-one corresponding to the three phases of the stator assembly and the wire-in positions of the n winding branches of the corresponding phase are connected, and the star copper bars 200 are set to two and the wire-in positions of the n-1 winding branches of each phase are connected to one star copper bar 200 and the wire-out positions of the winding branches of each phase are connected to the other star copper bar 200, so that the three phase copper bars 100 and the two phase copper bars 100 both have relatively simple structures and relatively small spans in the circumferential direction; at the same time, the three phase copper bars 100 also have relatively small spans when fixed together by the plastic material, and the star copper bar 200 with a relatively large span does not overlap the three phase copper bars 100 fixed together in the circumferential direction, and when the star copper bar 200 with a relatively small span overlaps the three phase copper bars 100 fixed together, there is only relatively little intersection, so that the application can realize the concentrated wire-in and wire-out of the odd-layer multi-branch winding structure, so that the phase copper bars 100 and the star copper bars 200 have relatively simple structures, so as not to be easily failed due to vibration when the phase copper bars 100 and the star copper bars 200 are prepared into a busbar assembly.

[0109] The application also provides a stator assembly, which comprises any one of the odd-layer multi-branch winding structures provided by the application.

[0110] At the same time, the application also provides an electric machine, which comprises any one of the stator assemblies provided by the application.

[0111] The technical features of the above embodiments can be combined in any manner, and to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the description.

[0112] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific and detailed manner, but should not be construed as limiting the scope of the patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A winding structure with an odd number of layers and multiple branches, characterized in that, The odd-numbered layer multi-branch winding structure is used for the stator assembly, which has three phases and p pole pairs, where p is a positive integer greater than 1. The stator assembly also includes a stator core (800), which has Z consecutive conductor slots (810) numbered 1-Z, where Z is a multiple of 12. Each conductor slot (810) has m+1 consecutive slot layers numbered 1-(m+1), where m is a positive even number. The odd-layer multi-branch winding structure includes three phase winding lines, wherein the winding lines of two phases are obtained by sequentially shifting the winding lines of the other phase by Z / 3p and 2Z / 3p conductor slots (810); Each phase of the winding circuit includes n parallel winding branches, where n is a positive integer not less than 3. The incoming positions of the n-1 winding branches are the m+1 slot layers of the n-1 consecutive conductor slots (810) with serial numbers r, r+1...[r+(n-2)] and the outgoing positions are the m+1 slot layers of the n-1 consecutive conductor slots (810) with serial numbers s, s+1...[s+(n-2)]. The number of conductor slots (810) between the conductor slot (810) with serial number r and the conductor slot (810) with serial number s is not less than Z / 3p+n-1 and less than Z / 2. The incoming line of the other winding branch is the slot layer with the serial number 2 of the conductor slot (810) with the serial number r+(n-2), and the outgoing line is the slot layer with the serial number 1 of the conductor slot (810) with the serial number "t". The odd-layer multi-branch winding structure further includes phase copper busbars (100) and star copper busbars (200). The phase copper busbars (100) correspond one-to-one with the three phases of the stator assembly. The phase copper busbars (100) are connected to the input positions of the n winding branches of their corresponding phases. There are two star copper busbars (200). One star copper busbar (200) is connected to the input positions of the n-1 winding branches of each phase, and the other star copper busbar (200) is connected to the output positions of the other winding branch of each phase.

2. The winding structure with an odd number of layers and multiple branches according to claim 1, characterized in that, Each winding branch includes an effective portion (910) disposed in the conductor groove (810), a first extension portion (920) disposed at one end of the effective portion (910), and a second extension portion (930) disposed at the other end of the effective portion (910). Each winding branch is wound in sequence with the first extension portion (920), the effective portion (910), the second extension portion (930), the effective portion (910), and the first extension portion (920) as a cycle until the winding is completed with the first extension portion (920).

3. The winding structure with an odd number of layers and multiple branches according to claim 2, characterized in that, The first extension portion (920) at the n-1 winding branch inlet positions of any phase extends along the same side of the circumference, and the first extension portion (920) at the outlet positions also extends along the same side of the circumference, and the extension directions of the first extension portion (920) at the n-1 winding branch inlet positions and the first extension portion (920) at the outlet positions are on the same side of the circumference. The first extension portion (920) at the entrance position of another winding branch extends along the same side of the circumference as the first extension portion (920) at the entrance position of n-1 winding branches, and the first extension portion (920) at the exit position of another winding branch extends along the other side of the circumference to be close to the first extension portion (920) at the entrance position.

4. The winding structure with an odd number of layers and multiple branches according to claim 3, characterized in that, Each winding branch includes an introduction wire (300), an exit wire (400), a lapped coil (500), a cross-wire coil (600), and a reverse twisted coil (700). The introduction wire (300) includes an introduction effective edge (310) serving as the effective part (910), an introduction hairpin end (320) serving as the first extension part (920), and an introduction welding end (330) serving as the second extension part (930). The introduction effective edge (310) is set as one, and the introduction hairpin end (320) and the introduction welding end (330) are respectively arranged on both sides of the introduction effective edge (310). The lead wire (400) includes an effective lead edge (410) serving as the effective portion (910), a lead-out hook end (420) serving as the first extension portion (920), and a lead-out welding end (430) serving as the second extension portion (930). The effective lead edge (410) is configured as one, and the lead-out hook end (420) and the lead-out welding end (430) are respectively disposed on both sides of the effective lead edge (410). The lapped coil (500) includes a lapped effective edge (510) serving as the effective portion (910), a lapped hairpin end (520) serving as the first extension portion (920), and a lapped welding end (530) serving as the second extension portion (930). The lapped effective edge (510) is configured as two, and the lapped welding end (530) corresponds one-to-one with the lapped effective edge (510) and is respectively connected to the same end of the two lapped effective edges (510). The two lapped welding ends (530) extend in a direction that approaches each other, and the lapped hairpin end (520) is connected to the other end of the two lapped effective edges (510). The crossover coil (600) includes a crossover effective edge (610) serving as the effective portion (910), a crossover hairpin end (620) serving as the first extension portion (920), and a crossover welding end (630) serving as the second extension portion (930). The crossover effective edge (610) is configured as two, and the crossover welding end (630) corresponds one-to-one with the crossover effective edge (610) and is respectively connected to the same end of the two crossover effective edges (610). The two crossover welding ends (630) extend in the same direction, and the crossover hairpin end (620) is connected to the other end of the two crossover effective edges (610). The anti-twist coil (700) includes an anti-twist effective edge (710) serving as the effective portion (910), an anti-twist hairpin end (720) serving as the first extension portion (920), and an anti-twist welding end (730) serving as the second extension portion (930). The anti-twist effective edge (710) is configured as two, and the anti-twist welding end (730) corresponds one-to-one with the anti-twist effective edge (710) and is respectively connected to the same end of the two anti-twist effective edges (710). The two anti-twist welding ends (730) extend in the same direction, and the anti-twist hairpin end (720) is connected to the other end of the two anti-twist effective edges (710).

5. The winding structure with an odd number of layers and multiple branches according to claim 4, characterized in that, The effective lead-in edge (310) of the lead-in wire (300) is wound in a slot layer with serial number m+1 or serial number 2, and the lead-in wire (300) serves as the entry position of the winding branch. The effective lead-out edge (410) of the lead-out wire (400) is wound in a slot layer with serial number m+1 or serial number 1, and the lead-out wire (400) serves as the exit position of the winding branch. The two effective leads (510) of the lapped coil (500) 0) The two effective sides (510) of the cross-wire coil (600) are wound in slots numbered 1 and 2, or in slots numbered 3 and 4, ... or in slots numbered m-1 and m. The two effective sides (710) of the anti-twist coil (700) are wound in slots numbered m+1 and m+1, respectively.

6. The winding structure with an odd number of layers and multiple branches according to claim 5, characterized in that, The pitch of the lapped coils (500) wound on the same slot layer is equal, the pitch of the cross-wire coil (600) is set to two types, and the pitch of the anti-twist coil (700) is equal.

7. The winding structure with an odd number of layers and multiple branches according to claim 6, characterized in that, Given p=4, Z=72, m=6, n=4, the three phases of the stator assembly are U phase, V phase, and W phase, wherein the winding line of the first winding branch of the U phase is: 1.7-10.6-1.5-10.4-1.3-10.2-1.1-10.1-19.2-10.3-19.4-10.5-19.6-10.7-20.7-29.6-20.5-29.4-20.3-29.2-20.1-29.1-38.2-29.3-38.4-29.5-38.6-29.7-39.7-48.6-39.5-48.4-39.3-48.2-39.1-48.1-57.2-48.3-57.4-48.5-57.6-48.7； The winding path of the second winding branch of phase U is as follows: 2.7-11.6-2.5-11.4-2.3-11.2-2.1-11.1-20.2-11.3-20.4-11.5-20.6-11.7-21.7-30.6-21.5-30.4-21.3-30.2-21.1-30.1-39.2-30.3-39.4-30.5-39.6-30.7-37.7-46.6-37.5-46.4-37.3-46.2-37.1-46.1-55.2-46.3-55.4-46.5-55.6-46.7； The winding path of the third winding branch of phase U is as follows: 3.7-12.6-3.5-12.4-3.3-12.2-3.1-12.1-21.2-12.3-21.4-12.5-21.6-12.7-19.7-28.6-19.5-28.4-19.3-28.2-19.1-28.1-37.2-28.3-37.4-28.5-37.6-28.7-38.7-47.6-38.5-47.4-38.3-47.2-38.1-47.1-56.2-47.3-56.4-47.5-56.6-47.7； The winding path of the fourth winding branch of phase U is as follows: 3.2-66.3-3.4-66.5-3.6-66.7-56.7-65.6-56.5-65.4-56.3-65.2-56.1-65.1-2.2-65.3-2.4-65.5-2.6-65.7-55.7-64.6-55.5-64.4-55.3-64.2-55.1-64.1-1.2-64.3-1.4-64.5-1.6-64.7-57.7-66.6-57.5-66.4-57.3-66.2-57.1-66.1。 8. The winding structure with an odd number of layers and multiple branches according to claim 1, characterized in that, The number of conductor slots (810) between the conductor slot (810) with serial number r and the conductor slot (810) with serial number s is equal to Z / 3+n-1.

9. The winding structure with an odd number of layers and multiple branches according to claim 1, characterized in that, The phase copper busbar (100) includes a first copper busbar body (110) and a first welding terminal (120). The first welding terminal (120) corresponds one-to-one with n winding branches. The first copper busbar body (110) is connected to n first welding terminals (120).

10. The winding structure with an odd number of layers and multiple branches according to claim 1, characterized in that, The star-shaped copper busbar (200) includes a second copper busbar body (210) and a second welding terminal (220). The second welding terminal (220) corresponds one-to-one with n-1 winding branches of each phase or one-to-one with another winding branch of each phase. The second copper busbar body (210) connects to 3 (n-1) of the second welding terminals (220) or connects to 3 of the welding terminals.

11. A stator assembly, characterized in that, The stator assembly includes an odd-layer multi-branch winding structure as described in any one of claims 1-10.

12. An electric motor, characterized in that, The motor includes the stator assembly as described in claim 11.

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