Stator assembly and motor

Abstract

The present application relates to the field of new energy vehicle drive motors, and more particularly to a stator assembly and a motor, which aims to solve the problems of high insulation cost and low power density of the motor. The stator assembly of the present application includes a stator core provided with stator slots and a multi-phase winding, the branches include a first coil group, a second coil group, and a connection line, the first coil group includes N first winding sections and N-1 first layer change lines, the first winding section includes a plurality of coil sets including a first layer spanning unit and a first pitch variable unit, the span of the first pitch variable unit is larger than the magnetic pole pitch of the motor or smaller than the magnetic pole pitch of the motor, the first layer change line connects two first winding sections, the span y1 of the first layer change line is set to y-2≦y1≦y+2, the second layer change line connects two adjacent second winding sections, and the span y2 of the second layer change line is set to y2=y. The stator assembly simplifies the coil insertion process of the multi-phase winding, improves the manufacturing efficiency of the motor, and reduces the insulation cost of the motor.

Description

[Technical field]

[0001] The present application relates to the field of new energy vehicle drive motor technology, and more particularly to a stator assembly and a motor. [Background technology]

[0002] Compared to conventional fuel-powered vehicles, electric vehicles have advantages in terms of power, smartness, and operating costs, and the drive motor may be a rectangular wire motor. The stator assembly of the rectangular wire motor includes a stator core and a multi-phase winding. A plurality of stator slots are distributed around the stator core, and each stator slot is provided with a conductor consisting of a multi-phase winding in multiple layers.

[0003] In the related art, since the multi-phase winding in the stator assembly is a fractional pitch winding, the multi-layer conductors in the same slot are located in different phases, so that it is necessary to provide insulating paper between the conductors in different phases in the same stator slot and to isolate the conductors of different phases with the insulating paper.

[0004] However, the insulating paper reduces the space factor of the stator assembly, reduces the power density of the drive motor, increases the insulation cost of the drive motor, and also increases the temperature rise of the windings. Summary of the Invention

[0005] In order to solve the above problems in the background art, that is, the problem of high insulation cost and low power density of the motor due to the multi-layer conductors in the same stator slot belonging to different phases, on the one hand, the present application provides a stator assembly for a motor, including a stator core having a plurality of stator slots uniformly arranged along a circumferential direction, and a multi-phase winding, each of the stator slots has M slot layers arranged along a radial direction of the stator core, where M is 4 or more and M is an even number; each of the windings of each phase includes at least two branches connected in parallel, and each of the branches includes a first coil group, a second coil group, and a connection wire for connecting the first coil group and the second coil group; The first coil group includes N first winding portions and N-1 first layer transition wires, and the N first winding portions are sequentially arranged along the radial direction of the stator core, where N=M / 2. Each of the first winding portions is provided correspondingly in two adjacent slot layers, and the first winding portions are arranged as follows, and in the corresponding two slot layers, the first winding portions are arranged as follows: along a first direction around the circumference of the stator core. Series connection Things to do the coil set includes one or both of a first layer spanning unit and a first pitch variable unit, at least one of the coil sets includes the first layer spanning unit and the first pitch variable unit, a span y of the first layer spanning unit is set to a magnetic pole pitch of the motor, a span of the first pitch variable unit is larger than or smaller than the magnetic pole pitch of the motor, two adjacent first winding portions are connected by the first layer transition line, and a span y1 of the first layer transition line is set to y-2≦y1≦y+2; The second coil group includes N second winding portions and N-1 second layer transition lines, the N second winding portions are sequentially arranged along the radial direction of the stator core, each of the second winding portions is correspondingly arranged in two adjacent slot layers, the second winding portions are arranged as follows, the second winding portion enters one of the slot layers in the corresponding two slot layers and is wound around the circumference of the stator core in a second direction with a span y across the layers, the second direction is different from the first direction, two adjacent second winding portions are connected by the second layer transition line, and a span y2 of the second layer transition line is set to y2=y, The connecting wire is wound around the outermost slot layer or the innermost slot layer with a span k, a first end of the connecting wire is connected to an end end of the first winding section, a second end of the connecting wire is connected to a start end of the second winding section, and the span k of the connecting wire is set to y-2≦k≦y+2.

[0006] In one embodiment, the first winding section is provided as a multi-turn first winding section, and in the two corresponding slot layers, one end of the first layer spanning unit is provided in one of the slot layers and the other end of the first layer spanning unit is provided in the other of the slot layers, one end of the first pitch variable unit is provided in one of the slot layers and the other end of the first pitch variable unit is provided in the other of the slot layers, The multiple first layer-crossing units are connected in series along the first direction around the circumference of the stator core, and the first pitch variable unit is used to connect two adjacent first layer-crossing units of the multi-winding first winding section, and in two adjacent first layer-crossing units in different windings of the multi-winding first winding section, one end of the first pitch variable unit is provided on one of the first layer-crossing units, and the other end of the first pitch variable unit is connected to the other first layer-crossing unit.

[0007] In one embodiment, in the multi-winding first winding section, the first layer spanning unit is provided as a U-shaped first layer spanning unit, and the first pitch variable unit is provided as a U-shaped first pitch variable unit, and in the corresponding two slot layers, an end of the U-shaped first layer spanning unit is connected to an end of another adjacent U-shaped first layer spanning unit, and other The end portion is connected to an end portion of the adjacent U-shaped first pitch variable unit, And / or, in the multi-turn second winding section, the second layer spanning unit is provided as a U-shaped second layer spanning unit, the second pitch variable unit is provided as a U-shaped second pitch variable unit, and in the corresponding two slot layers, an end of the U-shaped second layer spanning unit is connected to an end of another adjacent U-shaped second layer spanning unit, and other The end portion is connected to the end portion of the adjacent U-shaped second pitch variable unit.

[0008] In one implementation, the second winding portion is provided as a spiral-type second winding portion, and a plurality of the second layer-straddling units are sequentially connected along the second direction around the circumference of the stator core to form the spiral-type second winding portion, and the spiral-type second winding portion is connected to a second end of the connecting wire.

[0009] In one implementation, the connecting wire is wound around the outermost slot layer or the innermost slot layer with a span k, and the connecting wire is arranged along the first direction or along the second direction.

[0010] In one embodiment, the first coil group further includes a first lead end that is a first S-shaped conductor, and the first S-shaped conductor is located in one of the outermost slot layer and the innermost slot layer; The second coil group further includes a second lead end which is a second S-shaped conductor, the second S-shaped conductor being located in the other of the outermost slot layer and the innermost slot layer.

[0011] In one implementation, one of the first lead end and the second lead end is provided as an in-line and the other is provided as an out-line.

[0012] In one implementation, the number of stator slots is set to 54, the number of poles is set to 6, and the pole pitch is set to 9.

[0013] In one implementation, the multi-phase winding is provided as a three-phase winding, the winding of each phase has the same winding rule around the stator core, and the spatial phase difference between the windings of every two phases is set to 120°, and the three-phase winding is provided as a star connection or a delta connection.

[0014] On the other hand, the present application includes a stator assembly as described above. Motor to provide.

[0015] A person skilled in the art can understand that in the stator assembly provided in the embodiment of the present application, each of the windings of each phase includes at least two branches connected in parallel, and each branch includes a first coil group, a second coil group, and a connection wire for connecting the first coil group and the second coil group, where the first winding portion of the first coil group enters from one slot layer and is wound around the circumference of the stator core in a first direction with a span y across the layers in sequence, two adjacent first winding portions are connected by a first layer transition line, and the span y1 of the first layer transition line is set to y-2≦y1≦y+2 so that N first winding portions are provided in sequence along the radial direction of the stator core, and the second winding portion of the second coil group enters from one slot layer and is wound around the circumference of the stator core in a second direction with a span y across the layers in sequence, Second Two adjacent layers are formed by layer change lines. Second The winding parts are connected, Second Span y of layer transition line 2 teeth, y2=y and a winding process for each phase is realized by connecting the end of the first winding section and the start of the second winding section with a connecting wire; The above winding method allows all windings in the same stator slot to belong to the same phase, eliminating the need for insulating paper to separate windings of different phases in the same stator slot, improving the space factor of the motor, and further improving the power density and reducing the insulation cost of the motor. The above winding method also makes the magnetic paths of each branch in the windings of each phase completely symmetrical, eliminating the circulating current problem caused by the asymmetric structure, improving the efficiency of the motor, and reducing the temperature rise of the motor. Furthermore, the elimination of insulating paper in the same stator slot simplifies the coil insertion process for multi-phase windings, improving the manufacturing efficiency of the motor, and reducing the insulation cost of the motor. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a structural schematic diagram of a stator assembly according to an embodiment of the present application. [Diagram 2] 2 is a structural schematic diagram of a hairpin end of the stator assembly in FIG. 1. [Diagram 3] 2 is a structural schematic diagram of a welded end of the stator assembly in FIG. 1. [Figure 4] FIG. 2 is a structural schematic diagram of a stator slot on a stator core in FIG. [Diagram 5] 2 is a structural schematic diagram showing only an A-phase winding of the multi-phase winding of the stator assembly in FIG. 1. [Figure 6] 2 is a structural schematic diagram of a first branch of an A-phase winding in the multi-phase winding shown in FIG. 1. [Figure 7] 1 is a structural schematic diagram of a U-shaped conductor in some realization forms of an embodiment of the present application. [Figure 8] 11 is a structural schematic diagram of a U-shaped conductor in another embodiment of the present application. FIG. [Figure 9] 13 is a structural schematic diagram of a U-shaped conductor in yet another embodiment of the present application. FIG. [Figure 10] 2 is a structural schematic diagram of a first S-shaped conductor according to an embodiment of the present application. FIG. [Figure 11]2 is a schematic diagram of a phase belt distribution of a multi-phase winding in the first embodiment of the present application. FIG. [Figure 12] FIG. 4 is a schematic diagram of a winding rule for a first coil group of a first branch of an A phase in the first embodiment of the present application. [Figure 13] FIG. 11 is a schematic diagram of a winding rule for the second coil group of the first branch of the A phase in the first embodiment of the present application. [Figure 14] FIG. 4 is a schematic diagram of a winding rule for an A-phase first branch winding A1X1 in the first embodiment of the present application. [Figure 15] FIG. 11 is a schematic diagram of a winding rule for an A-phase second branch winding A2X2 in the first embodiment of the present application. [Figure 16] FIG. 2 is a schematic diagram showing an expanded view of an A-phase winding in the first embodiment of the present application. [Figure 17] FIG. 2 is a schematic diagram of a star connection of three-phase windings in the first embodiment of the present application. [Figure 18] FIG. 2 is a schematic diagram of a delta connection of three-phase windings in the first embodiment of the present application. [Figure 19] FIG. 11 is a schematic diagram of a winding rule for an A-phase first branch winding A1X1 in a second embodiment of the present application. [Figure 20] FIG. 11 is a schematic diagram of a winding rule for an A-phase second branch winding A2X2 in a second embodiment of the present application. [Figure 21] FIG. 13 is a schematic diagram of a winding rule for an A-phase first branch winding A1X1 in a third embodiment of the present application. [Figure 22] FIG. 13 is a schematic diagram of a winding rule for an A-phase second branch winding A2X2 in the third embodiment of the present application. [Diagram 23] FIG. 13 is a schematic diagram of a winding rule for an A-phase first branch winding A1X1 in a fourth embodiment of the present application. [Figure 24] FIG. 13 is a schematic diagram of a winding rule for an A-phase second branch winding A2X2 in the fourth embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] In the related art, the stator assembly is an important component of the motor, and in an electric vehicle, the motor needs to meet the requirements of light weight, high power density and high efficiency. Compared with a general round copper wire motor, the bare copper space factor of a rectangular wire motor can reach 60% or more, which is much higher than the bare copper space factor of a round copper wire of 40%. When the number of circumferential slots of the stator core in the motor remains the same, improving the space factor can reduce the DC resistance of the stator winding in the motor, reduce the copper loss of the motor, and improve the efficiency of the motor. Therefore, using a rectangular wire motor as a motor is one of the important measures to promote the weight reduction of electric vehicles, improve the driving range of electric vehicles, and reduce the powertrain cost.

[0018] The realization of fast charging of electric vehicles and the improvement of the power density of electric vehicle drive systems both require high voltage requirements for the motor of an electric vehicle. In the related art, the multi-phase winding in a stator assembly is generally short-pitch winding, so that the multi-layer conductors in the same stator slot are located in different phases. Therefore, in order to isolate the conductors of different phases with insulating paper, it is necessary to provide insulating paper between the conductors located in different phases in the same stator slot. However, the installation of insulating paper not only reduces the space factor of the motor, but also increases the copper loss of the motor and the temperature rise of the motor stator winding, limiting the power density of the motor and increasing the insulation cost of the motor.

[0019] In regard to the above problem, the embodiments of the present application provide a stator assembly and a motor, in which each of the windings of each phase of the stator assembly includes at least two branches connected in parallel, and each of the branches includes a first coil group, a second coil group, and a connection wire for connecting the first coil group and the second coil group, wherein a first winding portion of the first coil group enters from one slot layer and is wound around the circumference of the stator core in a first direction with a span y across the layers in sequence, two adjacent first winding portions are connected by a first layer transition line, and the span y1 of the first layer transition line is set to y-2≦y1≦y+2 so that N first winding portions are provided in sequence along the radial direction of the stator core, and a second winding portion of the second coil group enters from one slot layer and is wound around the circumference of the stator core in a second direction with a span y across the layers in sequence, Second Two adjacent layers are formed by layer change lines. Second The windings are connected, Second Span y of layer transition line 2 teeth, y2=y and a winding process for each phase is realized by connecting the end of the first winding section and the start of the second winding section with a connecting wire; The above winding method allows all windings in the same stator slot to belong to the same phase, eliminating the need for insulating paper to separate windings of different phases in the same stator slot, improving the space factor of the motor, and further improving the power density and reducing the insulation cost of the motor. The above winding method also makes the magnetic paths of each branch in the windings of each phase completely symmetrical, eliminating the circulating current problem caused by the asymmetric structure, improving the efficiency of the motor, and reducing the temperature rise of the motor. Furthermore, the elimination of insulating paper in the same stator slot simplifies the coil insertion process for multi-phase windings, improving the manufacturing efficiency of the motor, and reducing the insulation cost of the motor.

[0020] Hereinafter, a stator assembly according to an embodiment of the present invention will be described with reference to the drawings.

[0021] First, technical terms related to the motor according to the embodiment of the present application will be interpreted and explained.

[0022] Regarding the number of motor poles, i.e., the number of magnetic poles of a motor, the magnetic poles are divided into N poles and S poles, and generally, one N pole and one S pole are called one pair of magnetic poles, that is, the number of pole pairs (P) of a motor is one.

[0023] Regarding the number of slots for each pole and each phase, the number of slots that each phase winding occupies in each magnetic pole is called the number of slots for each pole and each phase.

[0024] Regarding the number of phases of a motor, the "phase" in the motor phase number generally refers to the number of phase wires (i.e., fire wires), for example, a three-phase motor uses three phase wires. The number of phases of a motor is usually defined by the number of wire ends (not including the neutral wire) on the stator side of the motor.

[0025] The phase belt of a motor is the number of slots on the stator core that are consecutively occupied by the windings of each pole and phase.

[0026] The space factor refers to the ratio of the cross-sectional area of ​​the conductor in the slot of the stator core to the effective area of ​​the slot body.

[0027] The pole pitch of a motor is the distance between two adjacent magnetic poles along the surface of the stator core.

[0028] Span, also called pitch, is the distance that two effective sides of the same conductor in a winding in a motor span across the armature surface, and is usually expressed in number of slots.

[0029] A full node is one whose pitch is equal to the pole pitch.

[0030] A short segment is one whose pitch is less than the pole pitch.

[0031] An embodiment of the present application provides a stator assembly applied to a motor, and referring to FIG. 1, FIG. 4 and FIG. 6, the stator assembly includes a stator core 100 in which a plurality of stator slots 110 are uniformly arranged along the circumferential direction, and a multi-phase winding 200, and each stator slot 110 has M slot layers arranged along the radial direction of the stator core 100, where M is 4 or more and M is an even number, and there may be six slot layers in the stator slot 110, and the six slot layers may be a, b, c, d, e and f layers in order along the direction in which the slot bottom faces the slot opening. Exemplarily, the slot layer of the a layer, i.e., the first slot layer, is located at the innermost side of the stator slot 110, and the slot layer of the f layer, i.e., the sixth slot layer, is located at the outermost side of the stator slot 110. It can be understood that the slot layer of the a layer may be located at the outermost side of the stator slot 110, and the slot layer of the f layer may be located at the innermost side of the stator slot 110. In addition, the slot layers can be understood as spaces provided sequentially in the slot depth direction of the same stator slot 110 and used for wiring windings, and the spaces may be virtual spaces within the stator slot 110 for explaining the positions in the slot depth direction of the stator slot 110 when the windings are wired within the stator slot 110.

[0032] 2 and 3, both end surfaces of the stator core 100 may be defined as a hairpin end 120 and a welding end 130, respectively, and the polyphase winding 200 may be inserted into the stator core 100 from the hairpin end 120 side and welded to the welding end 130. Exemplarily, the hairpin end 120 may be located at the top end of the stator core 100, and the welding end 130 may be located at the bottom end of the stator core 100.

[0033] The multi-phase winding 200 is a winding of multiple phases whose electrical phases are different from each other. For example, the multi-phase winding 200 may be a three-phase winding, and the three-phase windings may have the same winding rule on the stator core 100 and have a spatial phase difference of 120°. That is, the multi-phase winding 200 may include three phase windings, for example, an A-phase winding 210, a B-phase winding, and a C-phase winding. The three-phase winding may be star-connected or delta-connected. Referring to FIG. 5, there is shown a structural schematic diagram of the stator assembly of the embodiment of the present application, showing only the stator core 100 and the A-phase winding 210.

[0034] each of the windings of each phase includes at least two branches connected in parallel, and each of the branches includes a first coil group, a second coil group, and a connection wire for connecting the first coil group and the second coil group; The first coil group includes N first winding sections and N-1 first layer change wires, and the N first winding sections are sequentially arranged along the radial direction of the stator core 100, where N=M / 2. Each of the first winding sections is provided correspondingly in two adjacent slot layers. The first winding sections are arranged as follows. In the corresponding two slot layers, the first winding section is formed by connecting a plurality of coil sets in series. The coil set includes a first layer spanning unit and one of the first pitch variable units. at least one of the coil sets includes a first layer spanning unit and a first pitch variable unit, a span y of the first layer spanning unit is set to a pole pitch of the motor, a span of the first pitch variable unit is greater than or less than the pole pitch of the motor, two adjacent first winding portions are connected by a first layer transition line, and a span y1 of the first layer transition line is set to y-2≦y1≦y+2; No.The second coil group includes N second winding sections and N-1 second layer transition lines, the N second winding sections are arranged sequentially along the radial direction of the stator core 100, each second winding section is arranged correspondingly in two adjacent slot layers, the second winding sections are arranged as follows, the second winding section enters one of the slot layers in the corresponding two slot layers and is wound around the circumference of the stator core 100 in a second direction with a span y, sequentially across the layers, the second direction is set in the opposite direction to the first direction, the two adjacent second winding sections are connected by the second layer transition line, and the span y2 of the second layer transition line is set to y2=y.

[0035] The connecting wire is wound around the outermost slot layer or the innermost slot layer with a span k, a first end of the connecting wire is connected to an end end of the first winding section, and a second end of the connecting wire is connected to a start end of the second winding section, and the span k of the connecting wire is set to y-2≦k≦y+2.

[0036] Exemplarily, the first direction may be a clockwise direction when viewed from the hairpin end 120 of the stator core 100, and the second direction may be a counterclockwise direction when viewed from the hairpin end 120 of the stator core 100. It can be understood that the first direction and the second direction are interchangeable.

[0037] In addition, the slot layers of the stator core 100 can be divided into N groups of two adjacent slot layers so that N groups of two adjacent slot layers can be provided corresponding to N first winding sections or N second winding sections. For example, the first slot layer and the second slot layer may be two adjacent slot layers of the first group, the third slot layer and the fourth slot layer may be two adjacent slot layers of the second group, and by similar analogy, the M-1th slot layer and the Mth slot layer may be two adjacent slot layers of the M / 2th group.

[0038] In some possible embodiments, the first winding section may be provided as a multi-turn first winding section that may include a plurality of first straddling units and a plurality of first pitch variable units, and in two corresponding slot layers, one end of the first straddling unit is provided in one of the slot layers and the other end of the first straddling unit is provided in another slot layer, one end of the first pitch variable unit is provided in one of the slot layers and the other end of the first pitch variable unit is provided in another slot layer, and the plurality of first pitch variable units may be provided. The plurality of first layer-straddling units can be sequentially connected around the circumference of the stator core 100 in a first direction, and the first pitch variable unit connects two adjacent first layer-straddling units in different turns of the multi-winding first winding section, and one end of the first pitch variable unit is connected to one of the two adjacent first layer-straddling units in different turns of the multi-winding first winding section, and the other end of the first pitch variable unit is connected to the other first layer-straddling unit.

[0039] In the multi-winding first winding section, the first layer spanning unit can be provided in a U-shaped first layer spanning unit, the first pitch variable unit can be provided in the U-shaped first pitch variable unit, and in the corresponding two slot layers, an end of the U-shaped first layer spanning unit can be connected to an end of another adjacent U-shaped first layer spanning unit by welding, and the U-shaped first layer spanning unit other The end portion can be connected to an end portion of an adjacent U-shaped first pitch variable unit by welding; And / or, in the multi-turn second winding section, the second layer spanning unit is provided as a U-shaped second layer spanning unit, the second pitch variable unit is provided as a U-shaped second pitch variable unit, and in the corresponding two slot layers, an end of the U-shaped second layer spanning unit is connected to an end of another adjacent U-shaped second layer spanning unit by welding, other The end is connected to an end of an adjacent U-shaped second pitch variable unit by welding.

[0040] In some possible embodiments, the U-shaped first straddling unit, the U-shaped first pitch variable unit, the U-shaped second straddling unit and the U-shaped second pitch variable unit can all be manufactured by selecting a U-shaped conductor 220. Exemplarily, referring to FIG. 7, the U-shaped conductor 220 may include a first effective side 221, a first hairpin end 222 and a first twist head 223. The number of the first effective sides 221 is set to two, and the two first effective sides 221 are provided opposite each other, and the two first effective sides 221 are provided in the same or different slot layers in different stator slots 110, respectively. The first hairpin end 222 connects the first ends of the two first effective sides 221, and the first hairpin end 222 may be located at the hairpin end 120 of the stator core 100.

[0041] In some possible embodiments, the second ends of the first effective sides 221 may each be provided with a first twisting head 223, and the twisting directions of the two first twisting heads 223 may be set to be opposite and away from each other. In some other possible embodiments, referring to FIG. 8, the twisting directions of the two first twisting heads 223 may be the same or may be set to be opposite and away from each other. right You may also rotate to.

[0042] In another embodiment of the present application, referring to FIG. 9, the twisting directions of the two first twisting heads 223 may be the same or may be simultaneously left The end of the first twisting head 223 is a first welding end 224. A coil can be formed by welding the first welding ends 224 of different U-shaped conductors 220. According to the specific structures of the first coil group, the second coil group and the connecting wires of the same layer, different structures of the U-shaped conductors 220 can be selected.

[0043] It can be easily understood that the multi-turn first winding section is wound around the stator core 100 multiple times, and the total number of turns of the first winding section and the second winding section needs to be adjusted according to the number of stator slots 110 and the magnetic pole pitch of the motor. In some possible embodiments, the number of stator slots 110 is set to 54, the number of motor magnetic poles is set to 6, and the magnetic pole pitch of the motor is set to 9. Therefore, in the nine adjacent stator slots 110, the windings of each phase are provided correspondingly within three adjacent stator slots 110, and exemplarily, the total number of turns of the first winding section and the second winding section is equal to the number of stator slots 110 corresponding to the windings of each phase, that is, the total number of turns of the first winding section and the second winding section is set to 3.

[0044] In some possible embodiments, the first winding section is provided as a multi-winding first winding section, the number of turns of the multi-winding first winding section is set to 2, the second winding section is provided as a spiral-type second winding section, and the multiple second layer-straddling units are sequentially connected along a second direction around the circumference of the stator core 100 to form a spiral-type second winding section, and the spiral-type second winding section is connected to a second end of the connecting wire.

[0045] The first coil group further includes a first lead end 232 which is a first S-shaped conductor 230, and the first S-shaped conductor 230 is located in one of the outermost slot layer and the innermost slot layer, and exemplarily, referring to FIG. 10, the first S-shaped conductor 230 may include a second effective side 231, a lead end 232, and a second twist head 233. The second effective side 231 may be located in the slot layer in the stator slot 110. The lead end 232 is connected to a first end of the second effective side 231, and exemplarily, the lead end 232 may be located at the hairpin end 120 of the stator core 100.

[0046] The second torsion head 233 is connected to a second end of the second effective side 231, and illustratively, the second torsion head 233 may be located at the weld end 130 of the stator core 100. An end of the second torsion head 233 may have a second weld end 234. The second weld end 234 may be welded to the first weld end 224 of the U-shaped conductor 220 to form a coil. The second effective side 231 of the first S-shaped conductor 230 may be located in the first slot layer of the stator slot 110. Exemplarily, the second effective side 231 of the first S-shaped conductor may be located in the first slot layer of the stator slot 110. Winding section may be connected to a first spanning unit of the

[0047] The second coil group further includes a second S-shaped conductor, a second lead end 232, which is located in the other of the outermost slot layer and the innermost slot layer, and the structure of the second S-shaped conductor can refer to the description of the first S-shaped conductor 230 above, and detailed description is omitted in the embodiment of the present application. Moreover, one of the first lead end 232 and the second lead end 232 is provided as a lead-in line, and the other is provided as a lead-out line.

[0048] In order to easily understand the technical solutions of the embodiments of the present application, the technical solutions of the embodiments of the present application will be described below by taking as an example a multi-phase winding 200 in which the number of phases m is 3, the number of poles 2P is 6, the number of slots Q of the stator slots 110 is 54, the number of slot layers M of each stator slot 110 is 6, the number of slots q of each pole and each phase is 3, the magnetic pole pitch τ is 9, and each phase winding includes two branches. (First embodiment)

[0049] First, the phase belts of the polyphase winding 200 are divided. A schematic diagram of the phase belt division is shown in FIG.

[0050] 12 to 16, the first winding portion of the first branch A1X1 of the A phase enters from the slot layer a of the second stator slot 110 corresponding to the first magnetic pole through the first layer-straddling unit, and is gradually wound across layers along the circumference of the stator core 100 with a span of y=9 to the slot layer b of the 47th stator slot 110. Then, through the first pitch variable unit, it is wound up to the slot layer a of the first stator slot 110 corresponding to the adjacent magnetic pole with a span of y1=8, and then the first winding portion is wound across the slot layer b of the 47th stator slot 110. The winding is gradually wound around the circumference of the theta core 100 in the first direction across the layers with a span of y=9 up to the slot layer b of the 46th stator slot 110, realizing the winding process of the first winding part in the slot layer a and the slot layer b. Then, the winding is wound along the first layer transition line with a span of y1=10 up to the slot layer c of the second stator slot 110 corresponding to the adjacent magnetic pole, and the above winding rule is repeated to form a multi-turn type first winding part in both the slot layer c and the slot layer d, and the slot layer e and the slot layer f. Next, the second winding portion is wound around the circumference of the stator core 100 with a span k=11 along the first direction across the layers to the slot layer f of the third stator slot 110, and the second winding portion is wound around the circumference of the stator core 100 with a span y=9 via a second layer-crossing unit. Second The wire is gradually wound across the layers along the direction up to slot layer a of the 12th stator slot 110, and a spiral-type second winding portion is formed in slot layers c and d, and in slot layers e and f.

[0051] The winding method of the first coil group of the first branch A1X1 is as follows: Referring to FIG. 12, the first winding portion of the multi-turn type is in the order of 2a → 11b → 20a → 29b → 38a → 47b → 1a → 10b → 19a → 28b → 37a → 46b → 2c → 11d → 20c → 29d → 38c → 47d → 1c → 10d → 19c → 28d → 37c → 46d → 2e → 11f → 20e → 29f → 38e → 47f → 1e → 10f → 19e → 28f → 37e → 46f, The connection line is 46f → 3f, The winding scheme of the second coil group of the first branch A1X1 is as follows: The second spiral winding portion is 3f→48e→39f→30e→21f→12e→3d→48c→39d→30c→21d→12c→3b→48a→39b→30a→21b→12a.

[0052] The arrow directions are used to exemplarily describe the current directions in the first coil group, the connecting wires in the same layer, and the second coil group of the first branch A1X1, and are unrelated to the winding methods of the first coil group, the connecting wires in the same layer, and the second coil group of the first branch A1X1. Exemplarily, the winding methods of the first coil group, the connecting wires, and the second coil group of the first branch A1X1 may be the same as the current directions in the first coil group, the connecting wires, and the second coil group of the first branch A1X1.

[0053] The winding scheme of the second branch A2X2 of phase A is similar to that of the first branch A1X1, except that the first coil group of the second branch A2X2 of phase A enters from slot layer a of the 21st stator slot 110 and the second coil group of the second branch A2X2 of phase A enters from slot layer f of the 1st stator slot 110, the first coil group of the second branch A2X2 includes a spiral-type first winding portion, and the second coil group of the second branch A2X2 includes a multi-turn type second winding portion.

[0054] The winding scheme of the first coil group of the second branch A2X2 is as follows: The first spiral winding portion is 21a←30b←39a←48b←3a←12b←21c←30d←39c←48d←3c←12d←21e←30f←39e←48f←3e←12f, The connection line is 12f → 1f, The winding scheme of the second coil group of the second branch A2X2 is as follows: The second winding portion of the multi-turn type is 1f←46e←37f←28e←19f←10e←2f←47e←38f←29e←20f←11e←1d←46c←37d←28c←19d←10c←2d←47c←38d←29c←20d←11c←1b←46a←37b←28a←19b←10a←2b←47a←38b←29a←20b←11a.

[0055] It should be noted that the arrow direction is used to exemplarily describe the current direction in the first coil group, the connecting wire and the second coil group of the second branch A2X2 and has no relation to the winding manner of the first coil group, the connecting wire and the second coil group of the second branch A2X2. Exemplarily, the winding manner of the first coil group, the connecting wire and the second coil group of the second branch A2X2 may be opposite to the current direction in the first coil group, the connecting wire and the second coil group of the second branch A2X2.

[0056] 16, only the A-phase winding 210 is shown as a development view of the windings, and the B-phase and C-phase windings are not shown. The B-phase winding and C-phase winding have the same winding method as the A-phase winding 210, and the difference in spatial phase is 120°. Specifically, the B-phase is obtained by shifting q (i.e., 3) stator slots 110 in parallel with respect to the A-phase, and the C-phase is obtained by shifting q stator slots 110 in parallel with respect to the B-phase.

[0057] 17 and 18, the A-phase winding 210, the B-phase winding, and the C-phase winding may be star-connected. The A-phase winding 210, the B-phase winding, and the C-phase winding may be delta-connected.

[0058] With this winding method, each branch can traverse the phase belt and slot layer position where it is located, so that the potential of each branch is kept balanced and there is no circulating current between the branches, which improves the motor efficiency and reduces the temperature rise of the motor. Also, since the conductors in the same stator slot 110 belong to the same phase, there is no need to install insulating paper between the conductors, which improves the space factor, increases the power density of the motor, and reduces the insulation cost of the motor. Second embodiment

[0059] 19 and 20, the first winding portion of the first branch A1X1 of the A phase can enter from the slot layer a of the first stator slot 110 corresponding to the first magnetic pole through the first layer spanning unit, and is gradually wound around the circumference of the stator core 100 along the first direction with a span of y=9 to the slot layer b of the 46th stator slot 110, and then is wound through the first pitch variable unit to the slot layer a of the third stator slot 110 corresponding to the adjacent magnetic pole with a span of y1=11, and then , the winding is gradually wound around the circumference of the stator core 100 in the first direction across the layers with a span of y=9 up to the slot layer b of the 48th stator slot 110, thus realizing the winding process of the first winding section in the slot layer a and the slot layer b. Then, the winding is wound through the first layer transition line with a span of y1=7 up to the slot layer c of the first stator slot 110 corresponding to the adjacent magnetic pole, and the above winding rule is repeated to form a multi-turn type first winding section in both the slot layer c and the slot layer d, and in the slot layer e and the slot layer f. Next, the second winding portion is wound around the circumference of the stator core 100 with a span k=8 along the first direction across the layers to the slot layer f of the second stator slot 110, and the second winding portion is wound around the circumference of the stator core 100 with a span y=9 via a second layer spanning unit. Second The wire is gradually wound across the layers along the direction up to slot layer a of the 11th stator slot 110, and a spiral-type second winding portion is formed in slot layers c and d, and in slot layers e and f.

[0060] The winding method of the first coil group of the first branch A1X1 is as follows: The first winding part of the multi-winding type is 1a → 10b → 19a → 28b → 37a → 46b → 3a → 12b → 21a → 30b → 39a → 48b → 1c → 10d → 19c → 28d → 37c → 46d → 3c → 12d → 21c → 30d → 39c → 48d → 1e → 10f → 19e → 28f → 37e → 46f → 3e → 12f → 21e → 30f → 39e → 48f, The connection line is 48f → 2f, The winding method of the second coil group of the first branch A1X1 is as follows: The second spiral winding portion is 2f → 47e → 38f → 29e → 20f → 11e → 2d → 47c → 38d → 29c → 20d → 11c → 2b → 47a → 38b → 29a → 20b → 11a, The arrow direction is used to exemplarily describe the current direction in the first coil group, the connecting wire of the same layer, and the second coil group of the first branch A1X1, and is unrelated to the winding method of the first coil group, the connecting wire of the same layer, and the second coil group of the first branch A1X1. Exemplarily, the winding method of the first coil group, the connecting wire, and the second coil group of the first branch A1X1 may be the same as the current direction in the first coil group, the connecting wire, and the second coil group of the first branch A1X1.

[0061] The winding scheme of the second branch A2X2 of phase A is similar to that of the first branch A1X1, except that the first coil group of the second branch A2X2 of phase A enters from slot layer a of the 20th stator slot 110 and the second coil group of the second branch A2X2 of phase A enters from slot layer f of the 3rd stator slot 110, the first coil group of the second branch A2X2 includes a spiral-type first winding portion, and the second coil group of the second branch A2X2 includes a multi-turn type second winding portion.

[0062] The winding scheme of the first coil group of the second branch A2X2 is as follows: The first spiral winding portion is 20a←29b←38a←47b←2a←11b←20c←29d←38c←47d←2c←11d←20e←29f←38e←47f←2e←11f, The connection line is 11f → 3f, The winding scheme of the second coil group of the second branch A2X2 is as follows: The second winding portion of the multi-turn type is 3f←48e←39f←30e←21f←12e←1f←46e←37f←28e←19f←10e←3d←48c←39d←30c←21d←12c←1d←46c←37d←28c←19d←10c←3b←48a←39b←30a←21b←12a←1b←46a←37b←28a←19b←10a, The arrow directions are used to exemplarily describe the current directions in the first coil group, the connecting wires and the second coil group of the second branch A2X2 and are independent of the winding scheme of the first coil group, the connecting wires and the second coil group of the second branch A2X2. Exemplarily, the winding scheme of the first coil group, the connecting wires and the second coil group of the second branch A2X2 may be opposite to the current direction in the first coil group, the connecting wires and the second coil group of the second branch A2X2.

[0063] The A-phase winding 210, the B-phase winding, and the C-phase winding may be star-connected. The A-phase winding 210, the B-phase winding, and the C-phase winding may be delta-connected. (Third embodiment)

[0064] 21 and 22, the first winding portion of the first branch A1X1 of the A phase can enter from the slot layer a of the first stator slot 110 corresponding to the first magnetic pole through the first layer spanning unit, and is gradually wound around the circumference of the stator core 100 along the first direction with a span y=9 to the slot layer b of the 46th stator slot 110, and then is wound through the first pitch variable unit to the slot layer a of the third stator slot 110 corresponding to the adjacent magnetic pole with a span y1=11, and then Then, the winding is gradually wound around the circumference of the stator core 100 in the first direction with a span of y=9 across the layers up to the slot layer b of the 48th stator slot 110, realizing the winding process of the first winding part in the slot layer a and the slot layer b. Then, the winding is wound along the first layer transition line with a span of y1=9 up to the slot layer c of the third stator slot 110 corresponding to the adjacent magnetic pole, and the above winding rule is repeated to form a multi-turn type first winding part in both the slot layer c and the slot layer d, and in the slot layer e and the slot layer f. Next, the second winding portion is wound around the circumference of the stator core 100 with a span k=10 along the first direction across the layers to the slot layer f of the second stator slot 110, and the second winding portion is wound around the circumference of the stator core 100 with a span y=9 through a second layer-crossing unit. Second The wire is gradually wound across the layers along the direction up to slot layer a of the 11th stator slot 110, and a spiral-type second winding portion is formed in slot layers c and d, and in slot layers e and f.

[0065] The winding method of the first coil group of the first branch A1X1 is as follows: The first winding part of the multi-turn type is 1a → 10b → 19a → 28b → 37a → 46b → 3a → 12b → 21a → 30b → 39a → 48b → 3c → 12d → 21c → 30d → 39c → 48d → 1c → 10d → 19c → 28d → 37c → 46d → 3e → 12f → 21e → 30f → 39e → 48f → 1e → 10f → 19e → 28f → 37e → 46f, The connection line is 46f → 2f, The winding method of the second coil group of the first branch A1X1 is as follows: The second spiral winding portion is 2f → 47e → 38f → 29e → 20f → 11e → 2d → 47c → 38d → 29c → 20d → 11c → 2b → 47a → 38b → 29a → 20b → 11a, The arrow direction is used to exemplarily describe the current direction in the first coil group, the connecting wire of the same layer, and the second coil group of the first branch A1X1, and is unrelated to the winding method of the first coil group, the connecting wire of the same layer, and the second coil group of the first branch A1X1. Exemplarily, the winding method of the first coil group, the connecting wire, and the second coil group of the first branch A1X1 may be the same as the current direction in the first coil group, the connecting wire, and the second coil group of the first branch A1X1.

[0066] The winding scheme of the second branch A2X2 of phase A is similar to that of the first branch A1X1, except that the first coil group of the second branch A2X2 of phase A enters from slot layer a of the 20th stator slot 110 and the second coil group of the second branch A2X2 of phase A enters from slot layer f of the first stator slot 110, the first coil group of the second branch A2X2 includes a spiral-type first winding portion, and the second coil group of the second branch A2X2 includes a multi-turn type second winding portion.

[0067] The winding scheme of the first coil group of the second branch A2X2 is as follows: The first spiral winding portion is 20a←29b←38a←47b←2a←11b←20c←29d←38c←47d←2c←11d←20e←29f←38e←47f←2e←11f, The connection line is 11f → 3f, The winding scheme of the second coil group of the second branch A2X2 is as follows: The second winding of the multi-winding type is 、1f←46e←37f←28e←19f←10e←3f←48e←39f←30e←21f←12e←1d←46c←37d←28c←19d←10c←3d←48c←39d←30c←21d←12c←3b←48a←39b←30a←21b←12a←1b←46a←37b←28a←19b←10a, The arrow directions are used to exemplarily describe the current directions in the first coil group, the connecting wires and the second coil group in the second branch A2X2 and are independent of the winding scheme of the first coil group, the connecting wires and the second coil group in the second branch A2X2. Exemplarily, the winding scheme of the first coil group, the connecting wires and the second coil group in the second branch A2X2 may be opposite to the current direction in the first coil group, the connecting wires and the second coil group in the second branch A2X2.

[0068] The A-phase winding 210, the B-phase winding, and the C-phase winding may be star-connected. The A-phase winding 210, the B-phase winding, and the C-phase winding may be delta-connected. (Fourth embodiment)

[0069] 23 and 24, the first winding portion of the first branch A1X1 of the A phase starts from the slot layer a of the first stator slot 110 corresponding to the first magnetic pole through the first layer-straddling unit, and is gradually wound around the circumference of the stator core 100 in the first direction with a span of y=9 to the slot layer b of the 28th stator slot 110, and then is wound around the circumference of the stator core 100 in the first direction with a span of y=11 to the slot layer a of the 39th stator slot 110 corresponding to the adjacent magnetic pole through the first pitch variable unit, and further is gradually wound around the circumference of the stator core 100 in the first direction with a span of y=9 to the slot layer b of the 30th stator slot 110. Then, through the first pitch variable unit, the winding is wound up to the slot layer a of the 37th stator slot 110 corresponding to the adjacent magnetic pole with a span of y1=7, and further, through the first layer-crossing unit with a span of y=9, the winding process of the first winding part in the slot layer a and the slot layer b is realized. Then, through the first layer-crossing unit, the winding is wound up to the slot layer c of the 3rd stator slot 110 corresponding to the adjacent magnetic pole with a span of y1=11, and the above winding rule is repeated to form a multi-turn type first winding part in both the slot layer c and the slot layer d, and in the slot layer e and the slot layer f. Next, the second winding portion is wound around the circumference of the stator core 100 with a span k=8 along the first direction across the layers up to the slot layer f of the 38th stator slot 110, and the second winding portion is wound around the circumference of the stator core 100 with a span y=9 via a second layer-crossing unit. Second The wire is gradually wound across the layers along the direction up to slot layer a of the 47th stator slot 110, and a spiral-type second winding portion is formed in slot layers c and d, and in slot layers e and f.

[0070] The winding method of the first coil group of the first branch A1X1 is as follows: The first winding part of the multi-turn type is 1a → 10b → 19a → 28b → 39a → 48b → 3a → 12b → 21a → 30b → 37a → 46b → 3c → 12d → 21c → 30d → 37c → 46d → 1c → 10d → 19c → 28d → 39c → 48d → 1e → 10f → 19e → 28f → 39e → 48f → 3e → 12f → 21e → 30f → 37e → 46f, The connection line is 46f → 38f, The winding method of the second coil group of the first branch A1X1 is as follows: The second spiral winding portion is 38f → 29e → 20f → 11e → 2f → 47e → 38d → 29c → 20d → 11c → 2d → 47c → 38b → 29a → 20b → 11a → 2b → 47a, The arrow direction is used to exemplarily describe the current direction in the first coil group, the connecting wire of the same layer, and the second coil group of the first branch A1X1, and is unrelated to the winding method of the first coil group, the connecting wire of the same layer, and the second coil group of the first branch A1X1. Exemplarily, the winding method of the first coil group, the connecting wire, and the second coil group of the first branch A1X1 may be the same as the current direction in the first coil group, the connecting wire, and the second coil group of the first branch A1X1.

[0071] The winding scheme of the second branch A2X2 of phase A is similar to that of the first branch A1X1, except that the first coil group of the second branch A2X2 of phase A enters from slot layer a of the 20th stator slot 110 and the second coil group of the second branch A2X2 of phase A enters from slot layer f of the 1st stator slot 110, the first coil group of the second branch A2X2 includes a spiral-type first winding portion, and the second coil group of the second branch A2X2 includes a multi-turn type second winding portion.

[0072] The winding scheme of the first coil group of the second branch A2X2 is as follows: The first spiral winding portion is 2a←11b←20a←29b←38a←47b←2c←11d←20c←29d←38c←47d←2e←11f←20e←29f←38e←47f, The connection line is 47f → 1f, The winding scheme of the second coil group of the second branch A2X2 is as follows: The second winding portion of the multi-turn type is 1f←46e←39f←30e←21f←12e←3f←48e←37f←28e←19f←10e←3d←48c←37d←28c←19d←10c←1d←46c←39d←30c←21d←12c←1b←46a←39b←30a←21b←12a←3b←48a←37b←28a←19b←10a, The arrow directions are used to exemplarily describe the current directions in the first coil group, the connecting wires and the second coil group of the second branch A2X2 and are independent of the winding scheme of the first coil group, the connecting wires and the second coil group of the second branch A2X2. Exemplarily, the winding scheme of the first coil group, the connecting wires and the second coil group of the second branch A2X2 may be opposite to the current direction in the first coil group, the connecting wires and the second coil group of the second branch A2X2.

[0073] The A-phase winding 210, the B-phase winding, and the C-phase winding may be star-connected. The A-phase winding 210, the B-phase winding, and the C-phase winding may be delta-connected.

[0074] The embodiment of the present application further provides a motor including the stator assembly according to any one of the above aspects. Since the motor of the embodiment of the present application includes the stator assembly according to any one of the above aspects, the motor also has the advantages of the stator assembly according to any one of the above aspects, and detailed description thereof will be omitted in the embodiment of the present application.

[0075] Although the technical solutions of the present application have been described above with reference to the embodiments shown in the drawings, those skilled in the art can easily understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent modifications or replacements to the relevant technical features, and all of the technical solutions after such modifications or replacements are included in the scope of protection of the present application.

[0076] This application claims priority to a Chinese patent application filed with the China Patent Office on January 5, 2023, bearing application number 202310015400.9 and entitled "Stator Assembly and Motor," the entire contents of which are incorporated herein by reference.

Claims

1. A stator assembly for use in a motor, comprising: a stator core having a plurality of stator slots arranged along a circumferential direction; and a polyphase winding, each of the stator slots having M slot layers arranged along a radial direction of the stator core, where M is 4 or more and is an even number; each of the windings of each phase includes at least two branches connected in parallel, and each of the branches includes a first coil group, a second coil group, and a connection wire for connecting the first coil group and the second coil group; The first coil group includes N first winding portions and N-1 first layer change lines, and the N first winding portions are sequentially arranged along the radial direction of the stator core, where N=M / 2. Each of the first winding portions is provided correspondingly in two adjacent slot layers, and the first winding portions are arranged as follows. In the corresponding two slot layers, the first winding portion is formed by connecting a plurality of coil sets in series, and the coil set includes one of a first layer spanning unit and a first pitch variable unit, at least one of the coil sets includes the first layer spanning unit and the first pitch variable unit, a span y of the first layer spanning unit is set to a magnetic pole pitch of the motor, a span of the first pitch variable unit is greater than or less than the magnetic pole pitch of the motor, two adjacent first winding portions are connected by the first layer transition line, and a span y1 of the first layer transition line is set to y-2≦y1≦y+2; The second coil group includes N second winding portions and N-1 second layer transition lines, the N second winding portions are sequentially provided along the radial direction of the stator core, each of the second winding portions is provided correspondingly in two adjacent slot layers, the second winding portions are arranged as follows, the second winding portion enters one of the slot layers in the corresponding two slot layers and is wound around the circumference of the stator core in a second direction with a span y across the layers in sequence, the second direction is different from the first direction, two adjacent second winding portions are connected by the second layer transition line, and a span y2 of the second layer transition line is set to y2=y, a first end of the connection line is connected to an end terminal of the first winding portion, a second end of the connection line is connected to a start terminal of the second winding portion, and a span k of the connection line is set to y-2≦k≦y+2; 1. A stator assembly comprising:

2. the first winding section is provided as a multi-turn first winding section, and in the two corresponding slot layers, one end of the first layer-straddling unit is provided in one of the slot layers, and the other end of the first layer-straddling unit is provided in the other of the slot layers, one end of the first pitch variable unit is provided in one of the slot layers, and the other end of the first pitch variable unit is provided in the other of the slot layers, the plurality of first layer-straddling units are connected in series along the first direction around the circumference of the stator core, the first pitch variable unit is used to connect two adjacent first layer-straddling units of the multi-winding first winding section, and in two adjacent first layer-straddling units in different turns of the multi-winding first winding section, one end of the first pitch variable unit is provided to one of the first layer-straddling units, and the other end of the first pitch variable unit is connected to another first layer-straddling unit. The stator assembly of claim 1 .

3. In the multi-winding first winding section, the first layer-straddling unit is provided as a U-shaped first layer-straddling unit, the first pitch variable unit is provided as a U-shaped first pitch variable unit, and within the corresponding two slot layers, an end of the U-shaped first layer-straddling unit is connected to an end of another adjacent U-shaped first layer-straddling unit, and an end of the U-shaped first layer-straddling unit is connected to an end of the adjacent U-shaped first pitch variable unit, and / or, in the multi-turn second winding section, the second layer-straddling unit is provided as a U-shaped second layer-straddling unit, the second pitch variable unit is provided as a U-shaped second pitch variable unit, and within the corresponding two slot layers, an end of the U-shaped second layer-straddling unit is connected to an end of another adjacent U-shaped second layer-straddling unit, and an end of the U-shaped second layer-straddling unit is connected to an end of the adjacent U-shaped second pitch variable unit.

3. The stator assembly of claim 2.

4. the second winding portion is provided as a spiral-type second winding portion, and a plurality of the second layer-straddling units are sequentially connected along the second direction around the circumference of the stator core to form the spiral-type second winding portion, and the spiral-type second winding portion is connected to a second end of the connecting wire. The stator assembly of claim 1 .

5. The connecting wire is wound around the outermost slot layer or the innermost slot layer with a span k, and the connecting wire is provided along the first direction or the second direction. The stator assembly of claim 1 .

6. The first coil group further includes a first lead end that is a first S-shaped conductor, and the first S-shaped conductor is located in one of the slot layer of the outermost layer and the slot layer of the innermost layer; the second coil group further includes a second lead end which is a second S-shaped conductor, and the second S-shaped conductor is located in the other of the outermost slot layer and the innermost slot layer; The stator assembly of claim 1 .

7. One of the first lead end and the second lead end is provided as a lead-in line, and the other is provided as a lead-out line.

7. A stator assembly as claimed in claim 6.

8. The number of stator slots is set to 54, the number of magnetic poles is set to 6, and the magnetic pole pitch is set to 9. The stator assembly of claim 1 .

9. The multi-phase winding is provided as a three-phase winding, the winding of each phase has the same winding rule around the stator core, and the spatial phase difference between the windings of two phases is set to 120°, and the three-phase winding is provided as a star connection or a delta connection. A stator assembly according to any one of claims 1 to 8.

10. A motor comprising a stator assembly according to any one of claims 1 to 9.

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