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] Electric vehicles have advantages over conventional fuel-powered vehicles in terms of power, smartness, and operating costs. The drive motor may be a rectangular wire motor. The stator assembly of a rectangular wire motor includes a stator core and a multi-phase winding. Multiple stator slots are distributed around the circumferential direction of the stator core, and each stator slot is provided with a conductor consisting of multiple layers of multi-phase windings.

[0003] In the related art, since the multi-phase windings in the stator assembly are fractional-pitch windings, multi-layer conductors in the same slot are located in different phases, and therefore, insulating paper must be provided between the conductors in different phases in the same stator slot to separate the conductors of different phases.

[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-mentioned problems in the background art, that is, the problems of high motor insulation costs and low motor power density caused by multi-layer conductors in the same stator slot belonging to different phases, on the one hand, the present application provides a stator assembly applicable to 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 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 connecting 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 arranged correspondingly in two adjacent slot layers, and the first winding portions are arranged as follows: in the corresponding two slot layers, the first winding portions are arranged as follows: along a first direction on the circumference of the stator core Series connection 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 plurality of 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 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 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; 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 the end end of the first winding section, and a second end of the connecting wire is connected to the 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 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 another of the slot layers, and 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-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 one end of the first pitch variable unit is provided on one of the two adjacent first layer-crossing units in different windings of the multi-winding first winding section, and the other end of the first pitch variable unit is connected to another of the first layer-crossing units.

[0007] In one embodiment, in the multi-turn first winding section, the first layer spanning unit is provided as a U-shaped first layer spanning unit, 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 an 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 is connected to the end of the adjacent U-shaped second pitch variable unit.

[0008] In one embodiment, the second winding portion is provided as a spiral-type second winding portion, and a plurality of the second layer-straddling units are connected sequentially 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, and the second S-shaped conductor is 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 a lead-in wire, and the other is provided as a lead-out wire.

[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 embodiment, 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 each 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] Those skilled in the art will understand that in the stator assembly provided in the embodiments of the present application, each phase winding includes at least two branches connected in parallel, and each branch includes a first coil group, a second coil group, and a connecting wire for connecting the first coil group and the second coil group, wherein 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, spanning across layers in sequence, and 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 arranged 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, spanning across layers in sequence, Second Two adjacent layers are separated by a layer change line. No. 2 The winding parts are connected, Second Span y of layer change line 2 teeth, y2=y and connecting the end point of the first winding section and the start point of the second winding section with a connecting wire to realize the winding process of each phase; The above-described wire 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 motor's space factor, further increasing the motor's power density, and reducing motor insulation costs. The above-described wire winding method also makes the magnetic paths of each branch in each phase winding completely symmetrical, eliminating the problem of circulating currents caused by asymmetric structures, improving motor efficiency, and reducing motor temperature rise. Furthermore, eliminating the need for insulating paper in the same stator slot simplifies the coil insertion process for multi-phase windings, improving motor manufacturing efficiency, and reducing motor insulation costs. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a structural schematic diagram of a stator assembly according to an embodiment of the present invention. [Figure 2] FIG. 2 is a structural schematic diagram of a hairpin end of the stator assembly in FIG. 1. [Figure 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. [Figure 5] 2 is a structural schematic diagram showing only the A-phase winding of the multi-phase winding of the stator assembly in FIG. 1. FIG. [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. FIG. [Figure 7] 1 is a structural schematic diagram of a U-shaped conductor in some implementations of the embodiment of the present application. [Figure 8] 10 is a structural schematic diagram of a U-shaped conductor in another embodiment of the present application. FIG. [Figure 9] FIG. 10 is a structural schematic diagram of a U-shaped conductor in yet another embodiment of the present application. [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]3 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. 10 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. 10 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 invention. [Figure 17] FIG. 2 is a schematic diagram of a star connection of three-phase windings in the first embodiment of the present invention. [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. 10 is a schematic diagram of a winding rule for an A-phase first branch winding A1X1 in the second embodiment of the present application. [Figure 20] FIG. 10 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. 10 is a schematic diagram of a winding rule for an A-phase first branch winding A1X1 in the third embodiment of the present application. [Figure 22] FIG. 10 is a schematic diagram of a winding rule for an A-phase second branch winding A2X2 in the third embodiment of the present application. [Figure 23] FIG. 10 is a schematic diagram of a winding rule for an A-phase first branch winding A1X1 in the fourth embodiment of the present application. [Figure 24] FIG. 10 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 INVENTION

[0017] In the related art, the stator assembly is an important component of a motor. In electric vehicles, motors must meet the requirements of light weight, high power density, and high efficiency. Compared with conventional round copper wire motors, the bare copper space factor of rectangular wire motors can reach 60% or more, significantly higher than the bare copper space factor of 40% for round copper wire. If the number of circumferential slots in the stator core of a motor remains the same, improving the space factor can reduce the DC resistance of the stator winding in the motor, reduce the motor's copper loss, and improve motor efficiency. Therefore, using rectangular wire motors as motors is an important measure to promote the weight reduction of electric vehicles, improve their driving range, and reduce powertrain costs.

[0018] The realization of fast charging for electric vehicles and the improvement of the power density of electric vehicle drive systems both necessitate high voltage requirements for electric vehicle motors. In related art, multi-phase windings in stator assemblies are generally fractional-pitch windings, meaning that 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 install insulating paper between the conductors located in different phases in the same stator slot. However, installing insulating paper not only reduces the motor's space factor, but also increases the motor's copper loss and the temperature rise of the motor's stator windings, limiting the motor's power density and increasing the motor's insulation costs.

[0019] In response to the above-mentioned problem, embodiments of the present application provide a stator assembly and a motor, in which each phase winding of the stator assembly includes at least two branches connected in parallel, and each branch includes a first coil group, a second coil group, and a connecting 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, successively across layers, and 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 sequentially arranged 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, successively across layers, Second Two adjacent layers are separated by a layer change line. Second The windings are connected, Second Span y of layer change line 2 teeth, y2=y and connecting the end point of the first winding section and the start point of the second winding section with a connecting wire to realize the winding process of each phase; The above-described wire 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 motor's space factor, further increasing the motor's power density, and reducing motor insulation costs. The above-described wire winding method also makes the magnetic paths of each branch in each phase winding completely symmetrical, eliminating the problem of circulating currents caused by asymmetric structures, improving motor efficiency, and reducing motor temperature rise. Furthermore, eliminating the need for insulating paper in the same stator slot simplifies the coil insertion process for multi-phase windings, improving motor manufacturing efficiency, and reducing motor insulation costs.

[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 north poles and south poles, and generally, one north pole and one south 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] The number of phases in a motor 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 in a motor is usually defined by the number of wire ends (excluding the neutral wire) on the stator side of the motor.

[0025] The phase band 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 poles along the surface of the stator core.

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

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

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

[0031] An embodiment of the present application provides a stator assembly applicable to a motor. Referring to FIGS. 1, 4, and 6, the stator assembly includes a stator core 100 having a plurality of stator slots 110 uniformly arranged along the circumferential direction, and a polyphase winding 200. Each stator slot 110 has M slot layers arranged along the radial direction of the stator core 100, where M is 4 or greater and is an even number. Six slot layers may be provided within 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 bottoms face the slot openings. For example, the a-th layer, i.e., the first slot layer, is located at the innermost side of the stator slot 110, and the f-th layer, i.e., the sixth slot layer, is located at the outermost side of the stator slot 110. It can be understood that the a-th layer may be located at the outermost side of the stator slot 110, and the f-th layer may be located at the innermost side of the stator slot 110. The slot layers can be understood as spaces provided sequentially in the depth direction of the slots of the same stator slot 110, and used for wiring the windings. The spaces may also be virtual spaces within the stator slot 110 for explaining the positions of the windings in the depth direction of the slots 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 can be defined as a hairpin end 120 and a welding end 130, respectively, and the polyphase winding 200 can be inserted into the stator core 100 from the hairpin end 120 side and welded to the welding end 130. For example, the hairpin end 120 can be located at the top end of the stator core 100, and the welding end 130 can be located at the bottom end of the stator core 100.

[0033] The polyphase winding 200 is a winding having multiple phases with different electrical phases. For example, the polyphase winding 200 may be a three-phase winding, which may have the same winding pattern on the stator core 100 and a spatial phase difference of 120°. That is, the polyphase 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 windings may be star-connected or delta-connected. Referring to FIG. 5 , a structural schematic diagram showing only the stator core 100 and the A-phase winding 210 of the stator assembly according to the embodiment of the present application is shown.

[0034] 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 connecting 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-changing wires, and the N first winding portions are sequentially arranged along the radial direction of the stator core 100, where N=M / 2. Each of the first winding portions is arranged correspondingly in two adjacent slot layers. 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 the first layer-straddling unit and the first pitch variable unit. at least one coil set of the plurality of 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 the 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 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, and the N second winding sections are arranged sequentially along the radial direction of the stator core 100, and each second winding section is arranged correspondingly within two adjacent slot layers. The second winding sections are arranged as follows: within the corresponding two slot layers, the second winding section enters one of the slot layers and is wound around the circumference of the stator core 100 in a second direction with a span y, spanning the layers sequentially, and the second direction is set to be opposite 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 the end end of the first winding section, and a second end of the connecting wire is connected to the start end of the second winding section, and the span k of the connecting wire is set to y-2≦k≦y+2.

[0036] Illustratively, 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 is understood that the terms "first direction" and "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-1)th slot layer and the Mth slot layer may be two adjacent slot layers of the (M / 2)th 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, and 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, The plurality of first layer-straddling units can be connected sequentially 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 windings 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 windings of the multi-winding first winding section, and the other end of the first pitch variable unit is connected to another 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 a 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-winding 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, and other The end is connected to the end of the 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. For example, 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 first effective sides 221 is set to two, and the two first effective sides 221 are arranged opposite each other. The two first effective sides 221 are arranged in the same or different slot layers in different stator slots 110. The first hairpin end 222 connects 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 opposite and set away from each other. In 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 at the same time. right You can also go 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 different from each other. 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. Depending on 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 multiple times around the stator core 100, 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, among the nine adjacent stator slots 110, the windings of each phase are all 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, i.e., 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 multiple second layer-straddling units are connected sequentially along a second direction around the circumference of the stator core 100 to form the spiral-type second winding section, and the spiral-type second winding section is connected to the second end of the connecting wire.

[0045] The first coil group further includes a first lead end 232 that is a first S-shaped conductor 230. The first S-shaped conductor 230 is located in one of the outermost slot layer and the innermost slot layer. For example, referring to FIG. 10 , the first S-shaped conductor 230 may include a second effective side 231, a lead end 232, and a second torsion head 233. The second effective side 231 may be located in a slot layer within the stator slot 110. The lead end 232 is connected to a first end of the second effective side 231. For example, 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. Illustratively, 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 the first layer spanning unit of the

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

[0048] To facilitate understanding of 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 polyphase 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 A-phase first branch A1X1 enters through the first layer-straddling unit from the slot layer a of the second stator slot 110 corresponding to the first magnetic pole, 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 47th stator slot 110. Thereafter, through the first pitch variable unit, it is wound to the slot layer a of the first stator slot 110 corresponding to the adjacent magnetic pole with a span of y=8. The winding is gradually performed around the circumference of the theta core 100 with a span of y=9 along the first direction across the layers up to the slot layer b of the 46th 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 performed along the first layer transition line with a span of y=10 up to the slot layer c of the second stator slot 110 corresponding to the adjacent magnetic pole. 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=11 connecting wire across layers in the first direction up 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 through a second layer spanning unit. Second The wire is wound gradually across the layers along the direction up to slot layer a of the 12th stator slot 110, and a spiral-shaped second winding portion is formed in both slot layers c and d, and slot layers e and f.

[0051] The wire winding scheme of the first coil group of the first branch A1X1 is as follows: Referring to FIG. 12 , the multi-turn first winding section 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 connecting line is 46f → 3f, The wire winding scheme of the second coil group of the first branch A1X1 is as follows: The second spiral winding section 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 illustrate 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 schemes 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 schemes 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 slot layer a of the 21st stator slot 110 and the second coil group of the second branch A2X2 of phase A enters slot layer f of the first stator slot 110, and 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 second winding portion.

[0054] The wire 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 wire winding scheme of the second coil group of the second branch A2X2 is as follows: The second winding section 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] Note that the arrow direction is used to exemplarily illustrate the direction of current in the first coil group, connecting wires, and second coil group of the second branch A2X2, and is unrelated to the winding scheme of the first coil group, connecting wires, and second coil group of the second branch A2X2. Exemplarily, the winding scheme of the first coil group, connecting wires, and second coil group of the second branch A2X2 may be opposite to the direction of current in the first coil group, connecting wires, and second coil group of the second branch A2X2.

[0056] 16, the development of the windings shows only the A-phase winding 210, and does not include the B-phase and C-phase windings. The B-phase winding and C-phase windings and the A-phase winding 210 have the same winding method, and the difference in spatial phase is 120°. Specifically, the B-phase is obtained by shifting q (i.e., three) 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] This winding method allows each branch to traverse the phase belt and slot layer position where it is located, so the potential of each branch is kept balanced and there is no circulating current between the branches, improving motor efficiency and reducing motor temperature rise. Also, because the conductors in the same stator slot 110 belong to the same phase, there is no need to provide insulating paper between the conductors, which improves the space factor, increases the motor's power density, and reduces motor insulation costs. (Second embodiment)

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

[0060] The wire winding scheme of the first coil group of the first branch A1X1 is as follows: The multi-winding first winding portion 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 wire winding scheme 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 directions are used to exemplarily illustrate 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 schemes 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 schemes 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.

[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 slot layer a of the 20th stator slot 110 and the second coil group of the second branch A2X2 of phase A enters slot layer f of the third 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 wire 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 wire 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 illustrate the current directions in the first coil group, connecting wires, and second coil group of the second branch A2X2, and are independent of the winding scheme of the first coil group, connecting wires, and second coil group of the second branch A2X2. Exemplarily, the winding scheme of the first coil group, connecting wires, and second coil group of the second branch A2X2 may be opposite to the current direction in the first coil group, connecting wires, and 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, or 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 A-phase first branch A1X1 can enter through the first layer-straddling unit from the slot layer a of the first stator slot 110 corresponding to the first magnetic pole, and is gradually wound around the circumference of the stator core 100 across layers in the first direction with a span of y=9 to the slot layer b of the 46th stator slot 110, and then through the first pitch variable unit with a span of y=11 to the slot layer a of the third stator slot 110 corresponding to the adjacent magnetic pole, and then The winding is then gradually wound around the circumference of the stator core 100 across layers in the first direction with a span of y=9 up to the slot layer b of the 48th stator slot 110, completing the winding process of the first winding portion in slot layer a and slot layer b. After that, the winding is continued along the first layer transition line with a span of y=9 up to the slot layer c of the third stator slot 110 corresponding to the adjacent magnetic pole. The above winding rule is repeated to form multi-turn first winding portions in slot layers c and d, and in slot layers e and 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 wound gradually across the layers along the direction up to slot layer a of the 11th stator slot 110, and a spiral-shaped second winding portion is formed in both slot layers c and d, and slot layers e and f.

[0065] The wire winding scheme of the first coil group of the first branch A1X1 is as follows: The multi-winding first winding portion 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 wire winding scheme 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 directions are used to exemplarily illustrate 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 schemes 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 schemes 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.

[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, and 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 wire 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 wire 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 illustrate the current directions in the first coil group, connecting wires, and second coil group in the second branch A2X2, and are independent of the winding scheme of the first coil group, connecting wires, and second coil group in the second branch A2X2, which may exemplarily be opposite to the current direction in the first coil group, connecting wires, and 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, or 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 A-phase first branch A1X1 enters through the first layer-straddling unit at the slot layer a of the first stator slot 110 corresponding to the first magnetic pole, and is gradually wound around the circumference of the stator core 100 at a span of y=9 in the first direction to the slot layer b of the 28th stator slot 110. Thereafter, the first pitch variable unit is wound around the circumference of the stator core 100 at a span of y=11 in the first direction to the slot layer a of the 39th stator slot 110 corresponding to the adjacent magnetic pole. Then, the first winding portion of the A-phase first branch A1X1 enters through the first layer-straddling unit at the slot layer a of the first stator slot 110 corresponding to the first magnetic pole, and is gradually wound around the circumference of the stator core 100 at a span of y=9 in the first direction to the slot layer b of the 30th stator slot 110. Then, through the first pitch variable unit, the winding is performed up to slot layer a of the 37th stator slot 110, which corresponds to the adjacent magnetic pole with a span of y1=7. Then, through the first layer-crossing unit with a span of y=9, the winding is performed up to slot layer b of the 46th stator slot 110, completing the winding process for the first winding portion in slot layers a and b. Then, through the first layer-crossing unit, the winding is performed up to slot layer c of the third stator slot 110, which corresponds to the adjacent magnetic pole with a span of y1=11. The above winding rule is repeated to form multi-turn first winding portions in slot layers c and d, and in slot layers e and 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 wound gradually across the layers along the direction up to slot layer a of the 47th stator slot 110, and a spiral-shaped second winding portion is formed in both slot layers c and d, and slot layers e and f.

[0070] The wire winding scheme of the first coil group of the first branch A1X1 is as follows: The multi-winding first winding portion 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 connecting line is 46f → 38f, The wire winding scheme 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 directions are used to exemplarily illustrate 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 schemes 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 schemes 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.

[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 slot layer a of the 20th stator slot 110 and the second coil group of the second branch A2X2 of phase A enters slot layer f of the first stator slot 110, and 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 wire 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 connecting line is 47f → 1f, The wire 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 illustrate the current directions in the first coil group, connecting wires, and second coil group of the second branch A2X2, and are independent of the winding scheme of the first coil group, connecting wires, and second coil group of the second branch A2X2. Exemplarily, the winding scheme of the first coil group, connecting wires, and second coil group of the second branch A2X2 may be opposite to the current direction in the first coil group, connecting wires, and 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, or the A-phase winding 210, the B-phase winding, and the C-phase winding may be delta-connected.

[0074] An embodiment of the present application further provides a motor including the stator assembly described in any one of the above. Since the motor of the embodiment of the present application includes the stator assembly described in any one of the above, the motor also has the advantages of the stator assembly described in any one of the above, 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 substitutions to the relevant technical features, and all of the technical solutions after such modifications or substitutions are included in the scope of protection of the present application.

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

Claims

1. A stator assembly for use in a motor includes 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 connecting 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, and 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 around the circumference of the stator core along a first direction, and the coil set includes a first layer spanning unit, or the coil set includes includes a first layer spanning unit and a first pitch variable unit, at least one of the plurality of 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 change 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 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 change line, and a span y2 of the second layer change line is set to y2=y; a first end of the connecting wire is connected to an end terminal of the first winding portion, a second end of the connecting wire is connected to a start terminal of the second winding portion, and a span k of the connecting wire 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 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 plurality of first layer-stretching 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-stretching units of the multi-winding first winding section, and one end of the first pitch variable unit is provided to one of the two adjacent first layer-stretching units in different windings of the multi-winding first winding section, and the other end of the first pitch variable unit is connected to another first layer-stretching unit.

2. The stator assembly of claim 1.

3. In the multi-turn first winding portion, the first layer spanning unit is provided as a U-shaped first layer spanning 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 spanning unit is connected to an end of another adjacent U-shaped first layer spanning unit, and the other end of the U-shaped first layer spanning unit is connected to an end of the adjacent U-shaped first pitch variable unit, and / or the second winding section is provided as a multi-winding second winding section, and the multi-winding second winding section includes a second layer spanning unit and a second pitch variable unit, and in the multi-winding second winding section, the second layer spanning unit is provided as a U-shaped second layer spanning unit, and 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 spanning unit is connected to an end of another adjacent U-shaped second layer spanning unit, and the other end of the U-shaped second layer spanning 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 the spiral-type second winding portion includes a second layer-straddling unit, and a plurality of the second layer-straddling units are connected in sequence 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.

2. 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; 2. The stator assembly of claim 1.

6. the first coil group further includes a first lead end that is a first S-shaped conductor, the first S-shaped conductor being 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 that 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; 2. The stator assembly of claim 1.

7. one of the first lead end and the second lead end is provided as a lead-in wire, and the other is provided as a lead-out wire; 7. The stator assembly of 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.

2. 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, the difference in spatial phase between the windings of each two phases is set to 120°, and the three-phase winding is provided as a star connection or a delta connection; 2. The stator assembly of claim 1.

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

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