A stator assembly

Abstract

The present invention provides a stator assembly, which includes a stator core and a multi-phase winding. The stator core is provided with a plurality of slots in the circumferential direction, and each slot is provided with M slot layers. Each phase winding includes at least two parallel branches, and each branch includes a first coil group, a second coil group, and a connecting wire. The first coil group is connected to the second coil group in the same layer at a second span along the circumference of the stator core to form a first coil unit. Multiple first coil units are connected in sequence to form a first type of coil group. The first coil group is connected to the second coil group in the same layer at a first span along the circumference of the stator core to form a second coil unit. Multiple second coil units are connected in sequence to form a second type of coil group. The connecting wire connects the first type of coil group and the second type of coil group in the same layer at a fourth span along the circumference of the stator core to form a branch. The stator assembly provided by the present invention eliminates the provision of insulating paper between the slots.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator assembly. Background Art

[0002] Electric vehicles have gained a leading edge over traditional fuel vehicles in terms of power, intelligence, and operating costs, but the long charging time has greatly limited the promotion of electric vehicles.

[0003] To solve the problem of fast charging of electric vehicles, high voltage requirements are put forward for the drive motors of electric vehicles. In addition, in order to improve the power density of the drive system, high voltage requirements are also put forward for the drive motors. At present, the stator assembly in the drive motor includes a stator core and a multi-phase winding. There are multiple slots distributed circumferentially on the stator core. The same slot is provided with multiple layers of slots constituting each phase winding. The multiple layers of slots in the same slot are located in different phases. Insulating paper needs to be provided in the slot to prevent the isolation of the multiple layers of slots in the same slot.

[0004] However, the insulating paper between the slots reduces the slot fill rate of the drive motor, increases the copper loss of the drive motor and the temperature rise of the winding, limits the power density of the drive motor, and also increases the insulation cost of the drive motor. Summary of the Invention

[0005] The present invention provides a stator assembly, which not only eliminates the provision of interlaced insulating paper in the slot body, thereby improving the slot fill rate of the motor, reducing the insulation cost of the motor, and simplifying the wire insertion process of the motor, but also eliminates the circulating current problem caused by the asymmetric winding structure in the stator assembly, thereby improving the efficiency of the motor and reducing the temperature rise of the motor.

[0006] The present invention provides a stator assembly for use in an electric motor. The stator assembly includes a stator core and a multi-phase winding. The stator core is provided with a plurality of slots in a circumferential direction. Each slot is provided with M slot layers for winding and wiring, where M is an even number greater than or equal to four. Each phase of the winding includes at least two branches, each of which includes a first coil group, a second coil group, and a connecting wire.

[0007] The winding wires in the first slot layer are wound across layers along the first direction in the circumferential direction of the stator core to the Mth slot layer with a first span, thereby forming a first coil group; the second coil group has the same structure as the first coil group and is wound in the opposite direction; the first coil group is connected to the second coil group in the same layer with a second span along the circumferential direction of the stator core to form a first coil unit; a plurality of the first coil units are connected in sequence to form a first type of coil group; the second coil group of the first coil unit is connected to the first coil group in the adjacent first coil unit in the same layer with a third span along the circumferential direction of the stator core;

[0008] The first coil group is connected to the second coil group in the same layer with the first span along the circumference of the stator core to form a second coil unit, and a plurality of the second coil units are connected in sequence to form a second type of coil group; the second coil group of the second coil unit is connected to the first coil group in the adjacent second coil unit in the same layer with the first span along the circumference of the stator core;

[0009] The connecting wire connects the first type coil group and the second type coil group in the same layer with a fourth span in the circumferential direction of the stator core to form the branch; the second span, the third span and the fourth span are different from the first span, and the size of the fourth span is between the second span and the third span; the branches of the winding of each phase are connected in parallel and arranged in the M slot layers of the corresponding same slot body.

[0010] In an optional embodiment, the winding starting end of the first type coil group and the winding starting end of the second type coil group are both located in the first slot layer and correspond to different slot bodies;

[0011] The winding end of the first type coil group is located at the connecting line of the first slot layer, and the winding end of the second type coil group is located at the Mth slot layer.

[0012] In an optional embodiment, each of the branches includes an input end and an output end, and the input end and the output end of each branch correspond to different slot layers of different slot bodies.

[0013] In an optional embodiment, the winding start end of the first type coil group is located in the slot corresponding to the incoming end of the branch, and the winding end end of the second type coil group is located in the slot corresponding to the outgoing end of the branch.

[0014] In an optional embodiment, each phase of the winding includes two branches, one of which is arranged in part of the slot layers in the slot body, and the other branch is arranged in the remaining slot layers in the same slot body.

[0015] In an optional embodiment, the first span is equal to the pole pitch of the motor, the pole pitch of the motor is 9, the number of slots per pole per phase is 3, and the second span satisfies the condition: y1=y+2;

[0016] Wherein, y is the first span, y1 is the second span;

[0017] The third span satisfies the conditional formula: y2=y-2;

[0018] Wherein, y2 is the third span.

[0019] In an optional embodiment, the fourth span satisfies the condition: y3=y-1;

[0020] Wherein, y3 is the fourth span;

[0021] The connecting wire is wound in the same direction as or in an opposite direction to the wires in the same layer of the first type coil group.

[0022] In an optional embodiment, the first span is equal to the pole pitch of the motor, the pole pitch of the motor is 9, the number of slots per pole per phase is 3, and the second span satisfies the condition: y1=y-2;

[0023] Wherein, y is the first span, y1 is the second span;

[0024] The third span satisfies the conditional formula: y2=y+2;

[0025] Wherein, y2 is the third span.

[0026] In an optional embodiment, the fourth span satisfies the condition: y3=y+1;

[0027] Wherein, y3 is the fourth span;

[0028] The connecting wire is wound in the same direction as or in an opposite direction to the wires in the same layer of the first type coil group.

[0029] In an optional embodiment, two ends of the second coil group and the first coil group connected to each other are two adjacent magnetic poles in the corresponding branch.

[0030] The present invention provides a stator assembly. By providing at least two branches within each phase winding of the stator assembly and limiting the winding direction and span of the first coil group and the second coil group in each branch within the slot body of the stator core, the first coil group and the second coil group can form a first type coil group and a second type coil group. Since connecting wires connect the first type coil group and the second type coil group in the same layer along the circumference of the stator core, the first type coil group and the second type coil group can be connected via the connecting wires in each branch to form a branch, so that each branch in each phase winding can be connected in parallel to form a phase winding. On this basis, since the branches of each phase winding are connected in parallel and arranged in the M slot layers of the corresponding same slot body, not only can the winding layers arranged in the same slot of the stator core all belong to the same phase, the setting of the insulating paper in the same slot body is eliminated, thereby improving the slot fill rate and efficiency of the motor, reducing the temperature rise and insulation cost of the motor, simplifying the motor wire insertion process, and improving the manufacturing efficiency of the motor, but also making the magnetic circuits of each branch in each phase winding 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 1 is a schematic structural diagram of a stator assembly provided in an embodiment of the present invention;

[0033] Figure 2 is a top view of the stator assembly at the card issuing end provided by an embodiment of the present invention;

[0034] Figure 3 is a top view of the stator assembly at the welding end provided by an embodiment of the present invention;

[0035] Figure 4 Schematic diagram of the distribution of conductors in a slot of a stator core provided by an embodiment of the present invention;

[0036] Figure 5 1 is a schematic structural diagram of the A-phase winding of the stator assembly provided in an embodiment of the present invention;

[0037] Figure 6 is a schematic structural diagram of a first S-shaped conductor provided by an embodiment of the present invention;

[0038] Figure 7 is a structural schematic diagram of a first U-shaped conductor provided by an embodiment of the present invention;

[0039] Figure 8 is a schematic structural diagram of a second U-shaped conductor provided by an embodiment of the present invention;

[0040] Figure 9 is a schematic structural diagram of a third U-shaped conductor provided by an embodiment of the present invention;

[0041] Figure 10 Schematic diagram of phase belt distribution of a stator assembly provided by an embodiment of the present invention;

[0042] Figure 11 1 is a schematic diagram of a star connection of a multi-phase winding provided by an embodiment of the present invention;

[0043] Figure 12 1 is a schematic diagram of a triangle connection of a multi-phase winding provided by an embodiment of the present invention;

[0044] Figure 13This is a wiring diagram of the first type of coil group in the first branch of the A-phase winding on the stator core provided by the first embodiment of the present invention;

[0045] Figure 14 This is a wiring diagram of the second type of coil group in the first branch of the A-phase winding on the stator core provided by the first embodiment of the present invention;

[0046] Figure 15 This is a connection diagram of the first branch of the A-phase winding provided in the first embodiment of the present invention;

[0047] Figure 16 1 is a connection diagram of the second branch of the A-phase winding provided in the first embodiment of the present invention;

[0048] Figure 17 1 is a schematic diagram of the expansion of the A-phase winding provided in the first embodiment of the present invention;

[0049] Figure 18 This is a connection diagram of the first branch of the A-phase winding provided in the second embodiment of the present invention;

[0050] Figure 19 This is a connection diagram of the second branch of the A-phase winding provided in the second embodiment of the present invention;

[0051] Figure 20 This is a wiring diagram of the first type of coil group in the first branch of the A-phase winding on the stator core provided by the third embodiment of the present invention;

[0052] Figure 21 This is a wiring diagram of the second type of coil group in the first branch of the A-phase winding on the stator core provided by the third embodiment of the present invention;

[0053] Figure 22 This is a connection diagram of the first branch of the A-phase winding provided in the third embodiment of the present invention;

[0054] Figure 23 This is a connection diagram of the second branch of the A-phase winding provided in the third embodiment of the present invention;

[0055] Figure 24 1 is a schematic diagram of the expansion of the A-phase winding provided in the third embodiment of the present invention;

[0056] Figure 25 This is a connection diagram of the first branch of the A-phase winding provided by the fourth embodiment of the present invention;

[0057] Figure 26 This is a connection diagram of the second branch of the A-phase winding provided in the fourth embodiment of the present invention.

[0058] Description of reference numerals:

[0059] 100- stator assembly; 1- stator core; 11- slot body; 111- slot bottom; 112- slot opening; 2- multi-phase winding; 21- phase A winding; 22- hairpin terminal; 23- welding terminal; 24- lead terminal; 241- incoming terminal; 242- outgoing terminal; 25- conductor; 251- lead segment; 252- straight segment; 253- twist; 254- hairpin segment; 255- welding segment; 26- conductor layer; 27- lead wire. DETAILED DESCRIPTION

[0060] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0061] To facilitate understanding, the relevant technical terms in the motor involved in the embodiments of the present application are first explained and illustrated.

[0062] The number of motor poles, that is, the number of magnetic poles of the motor. The magnetic poles are divided into N poles and S poles. Generally, one N pole and one S pole are called a pair of magnetic poles, that is, the number of pole pairs (P) of the motor is 1.

[0063] The number of slots per pole per phase, the number of slots occupied by each phase winding under each magnetic pole is called the number of slots per pole per phase.

[0064] The number of phases in a motor generally refers to the number of phase wires (also known as live wires). For example, a three-phase motor uses three phase wires. The number of phases is usually defined by the number of output terminals on the motor's stator side (excluding the neutral wire).

[0065] The phase belt of the motor is the number of slots on the stator core that are continuously occupied by each pole and each phase winding.

[0066] The slot fill rate refers to the ratio of the conductor cross-sectional area in the slot of the designated core to the effective area of ​​the slot body.

[0067] The pole pitch of the motor is the distance between two adjacent magnetic poles along the armature surface.

[0068] The span, also known as the pitch, refers to the distance between the two sides of the same element in the winding of the motor on the armature surface, usually expressed in the number of slots.

[0069] Full pitch means the effective pitch is equal to the pole pitch, short pitch means the effective pitch is less than the pole pitch. For flat wire windings, full pitch means the effective pitch is equal to the pole pitch, short pitch means the effective pitch is less than the pole pitch.

[0070] New energy vehicles require motors (such as drives) to be lightweight, high power density, and efficient. Compared to conventional round copper wire motors, flat wire motors can achieve a bare copper slot fill rate exceeding 60%, significantly exceeding the 40% bare copper slot fill rate of round copper wire. This increased slot fill rate, while maintaining the same number of slots in the stator core, reduces the DC resistance of the stator winding, reduces copper loss, and improves motor efficiency. Therefore, flat wire motors have become a key measure to promote vehicle lightweighting, increase electric vehicle range, and reduce powertrain costs.

[0071] Due to the fast charging problem of electric vehicles and the increase in the power density of the drive system, high voltage requirements are being placed on the motors of electric vehicles. To this end, in the existing related technologies, a motor stator winding, a stator and a motor using the same are proposed. The motor stator winding adopts a short-pitch solution to improve the motor efficiency and facilitate the realization of high-speed motors, thereby meeting the high voltage requirements of electric vehicle motors and solving the fast charging problem of electric vehicles.

[0072] However, in the motor stator winding proposed in the related art, the multiple layers of conductors under the same slot in the circumferential direction of the stator core are located in different phases. Therefore, it is necessary to set insulating paper in the slot in the circumferential direction of the stator core around which the motor stator winding is wound, so as to prevent the isolation of the multiple layers of conductors in the same slot by the insulating paper.

[0073] However, the provision of insulating paper not only reduces the slot fill rate of the motor, increases the copper loss and other losses of the motor and the temperature rise of the motor stator winding, limits the power density of the motor, but also increases the insulation cost of the motor.

[0074] To address the problem of multiple layers of conductors in the same slot being located in different winding phases, requiring interphase insulating paper, an embodiment of the present invention provides a stator assembly that can be applied to a motor. By improving the winding method of the multi-phase winding in the stator assembly, not only is the provision of insulating paper in the slots circumferentially of the stator core eliminated, thereby increasing the slot fill rate of the motor, reducing the motor's copper loss, and improving the motor's efficiency, but it can also reduce the insulation cost of the stator assembly and simplify the stator assembly's wire insertion process. Furthermore, the stator assembly of the present invention can eliminate the circulating current problem caused by the asymmetric winding structure in the stator assembly, thereby improving the efficiency of the motor and reducing the temperature rise of the motor.

[0075] The structure of the stator assembly of the present invention will be further described below with reference to embodiments.

[0076] refer to Figure 1As shown, the stator assembly 100 includes a stator core 1 and a multi-phase winding 2, and a plurality of slots 11 are provided on the circumference of the stator core 1. The plurality of slots 11 can be arranged on the inner side of the stator core 1 along the circumference of the stator core 1. Each slot 11 is provided with M layers of slots for winding and wiring. M is an even number greater than and equal to four. For example, M can be 4, 6 or other even numbers greater than 4. In the present invention, there is no further limitation on the value of M. The multi-phase winding 2 can also be referred to as a stator winding. Generally, the stator winding has a hairpin end 22 and a welding end 23, and the hairpin end 22 and the welding end 23 are distributed on opposite sides of the stator core 1. The structure of the stator assembly 100 at the hairpin end 22 can refer to Figure 2 As shown, the structure of the stator assembly 100 at the welding end 23 can be referred to Figure 3 As shown, it is convenient to understand the structure of the stator assembly 100 at different perspectives.

[0077] It should be noted that the slot layer can be understood as the space for winding and wiring that is arranged in sequence in the direction of the slot depth of the same slot body 11. The space can be a virtual space inside the slot body 11, so as to facilitate the description of the position of the winding in the slot depth direction of the slot body 11 when the winding is wound inside the slot body 11.

[0078] Each phase winding may include at least two branches. The number of branches in each phase winding may satisfy the conditional equation: a ≤ M / 2, where a is the number of branches in each phase winding. For example, a may be 2, 3, or another value that satisfies the conditional equation. The number of branches in each phase winding is not further limited herein.

[0079] Continue to refer Figure 1 As shown, each branch includes a first coil group, a second coil group and a connecting line.

[0080] Continue to refer Figure 1 As shown, the windings in the first slot layer are wound along the first direction along the circumference of the stator core 1 to the Mth slot layer with a first span, forming a first coil group. In the field of motors, windings are generally conductors. Figure 4 When a wire is wound within one of the slot layers of the slot body 11, a conductor layer 26 having a conductor can be formed within that slot layer. When a wire is laid out within each slot layer of the slot body 11, the wire can be formed on an equal number of conductor layers 26 within that slot layer. In other words, the slot body 11 has M conductor layers 26. The M conductor layers 26 are stacked sequentially within the slot body 11 along the slot depth direction of the slot body 11.

[0081] The winding in the embodiment of the present invention may be a flat wire conductor, which can be understood as a conductor having a rectangular cross section perpendicular to the axial direction of the conductor.

[0082] The second coil group has the same structure as the first coil group, but is wound in the opposite direction. Specifically, the wires in the Mth slot layer (the Mth conductor layer) are wound across the circumference of the stator core 1 in a second direction, with a first span, to the Mth slot layer, forming the second coil group. The second direction is opposite to the first direction. The first coil group is then connected to the second coil group in the same layer along the circumference of the stator core 1 with a second span, forming the first coil unit.

[0083] Multiple first coil units are sequentially connected to form a first type coil group. The second coil group of the first coil unit is connected to the first coil group of adjacent first coil units in the same layer at a third span along the circumference of the stator core 1, so as to connect two adjacent first coil units in the first type coil group. This allows multiple first coil units to be sequentially connected to form the first type coil group.

[0084] It should be noted that the first direction may be a direction on the stator core 1 that has a certain angle with both the axial direction and the circumferential direction of the stator core 1. The first direction, the second direction, and the specific winding method of the first type of coil group on the stator core 1 will be further described below in specific embodiments.

[0085] In some embodiments, the first slot layer can be understood as a slot layer (the innermost slot layer) in the slot body 11 near the slot bottom 111, and the Mth slot layer can be understood as a slot layer (the outermost slot layer) in the slot body 11 near the slot opening 112. Alternatively, in some embodiments, the first slot layer can be understood as a slot layer in the slot body 11 near the slot opening 112, and the Mth slot layer can be understood as a slot layer in the slot body 11 near the slot bottom 111. In the present invention, the position of the first slot layer in the slot body 11 is not further limited.

[0086] The first coil group can also be connected to the second coil group in the same layer with a first span along the circumference of the stator core 1 to form a second coil unit. Multiple second coil units are connected in sequence to form a second type of coil group. Among them, the second coil group of the second coil unit is connected to the first coil group in the adjacent second coil unit in the same layer with a first span along the circumference of the stator core 1, so as to realize the connection between two adjacent second coil units in the second type of coil group, so that multiple second coil units can be connected in sequence to form a second type of coil group.

[0087] The connecting wires connect the first and second coil groups in the same layer at a fourth span in the circumferential direction of the stator core 1, forming a branch circuit. The second, third, and fourth spans are different from the first span, and the fourth span is between the second and third spans. The branches of each phase winding are connected in parallel and arranged within the M slot layers of the same slot body 11.

[0088] In this way, the first type coil group and the second type coil group are connected in the same layer along the circumference of the stator core 1 by the connecting line to form a branch circuit, so that the branches in each phase winding can be connected in parallel to form a phase winding.

[0089] On this basis, since the branches of each phase winding are connected in parallel and arranged in the M slot layers of the corresponding same slot body 11, not only can the stator core 1 in the same slot form each conductor layer 26 by the arranged windings belong to the same phase, the setting of the insulating paper in the same slot body 11 is eliminated, so as to improve the slot fill rate and efficiency of the motor, reduce the temperature rise and insulation cost of the motor, simplify the wire insertion process of the motor, so as to improve the manufacturing efficiency of the motor, but also can make the magnetic circuits of each branch in each phase winding completely symmetrical, eliminate the circulation problem caused by the asymmetric structure of each branch in each phase winding, improve the efficiency of the motor, and reduce the temperature rise of the motor.

[0090] It should be noted that when the branches of each phase winding are formed by connecting the above-mentioned first type coil group, second type coil group and connecting wires, and the branches of each phase winding are connected in parallel and arranged in the M slot layers of the corresponding same slot body 11, it is also possible for each branch of each phase winding to traverse the arranged phase belt and slot layer position, so that the magnetic circuits of each branch in each phase winding are completely symmetrical. Therefore, the potentials of the branches of each phase winding remain balanced, and there is no circulating current between the branches.

[0091] Among them, the winding starting points of the first type of coil group and the winding starting points of the second type of coil group are both located in the first slot layer and correspond to different slot bodies. This not only avoids mutual interference between the first type of coil group and the second type of coil group when they are wound in the slot body, but also ensures that the connecting line connects the first type of coil group and the second type of coil group, and the branch formed with the first type of coil group and the second type of coil group can traverse the phase belt and slot layer position arranged for each phase winding.

[0092] In some embodiments, the winding start of the first type coil group and the winding start of the second type coil group can be located in two adjacent slots 11 in the arranged phase belt to ensure that the winding start of the first type coil group and the second type coil group can be close to each other.

[0093] The winding end of the first type of coil group is located at the connecting line of the first slot layer, and the winding end of the second type of coil group is located at the M slot layer, so that the winding end of the first type of coil group and the winding start of the second type of coil group are connected in the same layer in the circumferential direction of the stator core.

[0094] Each branch includes an input and an output, and the input and output of each branch correspond to different slot layers of different slot bodies. In some embodiments, the input of a branch can be located in the first slot layer of one of the slot bodies 11, and the output of the branch can be located in the Mth slot layer of one of the slot bodies 11. Alternatively, in other embodiments, the input of a branch can be located in the Mth slot layer of another of the slot bodies 11, and the output of the branch can be located in the first slot layer of one of the slot bodies 11. In the present invention, the slot bodies 11 and corresponding slot layers where the input and output of each branch are located are not further limited.

[0095] The winding start of the first type of coil group is located in the slot body 11 corresponding to the branch's incoming wire end, and the winding end of the second type of coil group is located in the slot body 11 corresponding to the branch's outgoing wire end. This allows the incoming wire end and outgoing wire end of each branch to correspond to different slot layers of different slot bodies 11. For example, one of the incoming wire end and outgoing wire end of each branch can correspond to the first slot layer of one slot body 11, while the other can correspond to the Mth slot layer of another slot body 11.

[0096] like Figure 1 As shown in the figure, the incoming line end (not marked in the figure) and the outgoing line end (not marked in the figure) of the branch constitute the lead end 24 of the branch. In some embodiments, the lead end 24 of the branch can be located on one side of the hairpin end 22 of the stator core 1.

[0097] from Figure 1 As can be seen in the figure, the stator assembly 100 may include a plurality of lead terminals 24. The number of lead terminals 24 in the stator assembly 100 depends on the number of phases of the winding in the stator assembly 100 and the number of parallel branches in each phase winding. The number of phases of the winding can be represented by m, and m can include but is not limited to three. When m is three, the multi-phase winding 2 can be called a three-phase winding, and the motor including the three-phase winding can be called a three-phase motor. The three-phase winding may include an A-phase winding, a B-phase winding (not shown in the figure), and a C-phase winding, wherein the A-phase winding, the B-phase winding, and the C-phase winding are not shown in the figure.

[0098] In some embodiments, the number of lead terminals 24 in the stator assembly 100 may be the product of the number of winding phases and the number of parallel branches in each phase winding. For example, in a three-phase winding with two branches in each phase winding, the number of lead terminals 24 in the stator assembly 100 may be six.

[0099] Taking the A-phase winding 21 as an example, the winding structure of each phase winding in the slot 11 of the stator core 1 can be referred to Figure 5 As shown. Taking the number of branches in each phase winding as 2 as an example, refer to Figure 5 As shown, in some embodiments, the hairpin end 22 and the welding end 23 of each phase winding are respectively located on two opposite sides of the stator core 1 .

[0100] refer to Figure 6 、 Figure 7 Combined with Figure 5 As shown, each branch includes multiple conductors 25 connected in series. Conductors 25 can include S-shaped conductors and U-shaped conductors. Because each phase winding includes two parallel branches, each phase winding has four S-shaped conductors at the hairpin end 22, and each branch has one S-shaped conductor at the incoming and outgoing ends.

[0101] refer to Figure 6 As shown, the “S”-shaped conductor may include a lead segment 251 , a straight segment 252 and a welding segment 255 connected in sequence. The lead segment 251 and the welding segment 255 are respectively connected to the straight segment 252 through a twist 253 and are distributed on both sides of the straight segment 252 .

[0102] The straight section 252 of the "S"-shaped conductor at the incoming end 241 is arranged in the first slot layer of the slot body 11, and can form the winding in the first slot layer of the branch circuit, and serve as the winding starting point of the first type of coil group in the branch circuit. It is wound across the stator core 1 along the first direction in the circumference along the first span to the Mth slot layer, forming the first first coil group in the first type of coil group. In addition, the lead section 251 of the "S"-shaped conductor can serve as the lead-out line 27 of the incoming end of the branch circuit. The straight section 252 of the "S"-shaped conductor at the outgoing end can be arranged in the Mth slot layer of the slot body 11, and can serve as the winding end of the second type of coil group in the branch circuit. The "S"-shaped conductor at the outgoing end can serve as the lead-out line 27 of the outgoing end of the branch circuit.

[0103] It should be noted that, in addition to the "S"-shaped conductor, the first type coil group and the second type coil group of each branch may also include a plurality of "U"-shaped conductors connected in sequence. Figures 7 to 9 As shown, the "U" shaped conductor may include two welded segments 255, two twists 253, two straight segments 252 and a hairpin segment 254 connected in sequence, the two straight segments 252 are connected to the two ends of the hairpin segment 254, and the two welded segments 255 are connected to different straight segments 252 through a twist 253, thereby forming a "U" shaped conductor. The first type coil group and the second type coil group can be used Figures 7 to 9 One or more U-shaped conductors are provided. The straight section 252 of the U-shaped conductor passes through one of the slot layers of the slot body 11. The hairpin section 254 is located at the hairpin end 22 of the winding. Two adjacent U-shaped conductors are welded at the welding section 255. In this application, the number and type of U-shaped conductors in the first and second type coil assemblies are not further limited.

[0104] Because when wiring the windings in the motor field, the magnetic properties of adjacent magnetic poles in one branch of the same winding are generally opposite. In the present invention, the two ends of the second coil group connected to the first coil group are two adjacent magnetic poles in the corresponding branch. That is to say, the conductor layer 26 corresponding to the end of the first coil group connected to the second coil group in the slot body 11 is connected in the same layer with a second span along the circumference of the stator core 1, and the conductor layer 26 corresponding to the adjacent magnetic poles. The conductor layer 26 corresponding to the adjacent magnetic poles can be understood as the conductor layer 26 corresponding to the end of the second coil group connected to the first coil group in the slot body 11.

[0105] Among them, the first coil group and the second coil group, between two adjacent first coil units, and between two adjacent second coil units can all be connected by a same-layer wire. Taking the first type of coil group as an example, the first coil group and the second coil group can be connected by a same-layer wire with a second span, and the two adjacent first coil units can be connected by a same-layer wire with a third span. Since the first type of coil group includes multiple first coil units, and the first coil unit includes the first coil group and the second coil group, the first type of coil group has multiple same-layer wires with a second span and multiple same-layer wires with a third span. The winding direction of each same-layer wire with a second span within the first type of coil group is the same, and the winding direction of each same-layer wire with a third span within the first type of coil group is the same.

[0106] In some embodiments, each phase winding may include two branches, one of which is arranged in part of the slot layers in the slot body 11, and the other branch is arranged in the remaining slot layers in the same slot body 11, to ensure that each branch of each phase winding is arranged in the corresponding M slot layers of the same slot body 11, so that each conductor layer 26 in the same slot belongs to the same phase.

[0107] It should be noted that each phase winding may also be provided with three parallel branches. In the present invention, there is no further limitation on the number of branches in each phase winding.

[0108] The structure of the stator assembly 100 of the present invention is further described below by taking an example where each phase winding has two parallel branches.

[0109] In some embodiments, the first span is equal to the pole pitch of the motor, the pole pitch of the motor is 9, the number of slots per pole per phase is 3, and the second span satisfies the condition: y1=y+2;

[0110] Among them, y is the first span, y1 is the second span;

[0111] The third span satisfies the condition: y2=y-2;

[0112] Where y2 is the third span. Where the fourth span satisfies the conditional formula: y3 = y-1;

[0113] Among them, y3 is the fourth span;

[0114] The winding direction of the connecting wire is the same as or opposite to that of the wires on the same layer in the first type coil group.

[0115] In this way, the first type coil group and the second type coil group are connected by connecting wires to form a branch circuit, and the conductor layers 26 in the same slot all belong to the same phase. At the same time, the magnetic circuits of the branches in each phase winding can be made completely symmetrical.

[0116] The motor's pole pitch satisfies the equation: τ = Q / (2P). τ represents the motor's pole pitch, P represents the number of pole pairs, and Q represents the number of slots 11 on the stator core 1. τ can include, but is not limited to, 9. Q can include, but is not limited to, 54.

[0117] The number of slots per pole per phase satisfies the conditional formula: q=Q / (2Pm), where q represents the number of slots per pole per phase, and q may include but is not limited to 3.

[0118] In other embodiments, the first span is equal to the pole pitch of the motor, the pole pitch of the motor is 9, the number of slots per pole per phase is 3, and the second span satisfies the condition: y1=y-2;

[0119] Among them, y is the first span, y1 is the second span;

[0120] The third span satisfies the condition: y2=y+2;

[0121] Among them, y2 is the third span.

[0122] Among them, the fourth span satisfies the conditional formula: y3=y+1;

[0123] Among them, y3 is the fourth span;

[0124] The winding direction of the connecting wire is the same as or opposite to that of the wires on the same layer in the first type coil group.

[0125] In this way, while ensuring that the first type coil group and the second type coil group are connected by connecting wires to form a branch, it can also ensure that each conductor layer 26 in the same slot belongs to the same phase and that the magnetic circuits of each branch in each phase winding are completely symmetrical.

[0126] It should be noted that when each phase winding has two parallel branches, in order to ensure that all conductor layers 26 in the same slot belong to the same phase, the slot bodies 11 corresponding to the inlet ends of the two branches should differ by Q / 2 slots. Q can include, but is not limited to, . For example, when the inlet end of one branch enters slot body 11 No. 1, the inlet end of the other branch can enter slot body 11 No. 28. In this way, when the two branches are wound on the stator core 1, not only can all conductor layers 26 in the same slot belong to the same phase, but the magnetic circuits of the two branches are also completely symmetrical.

[0127] When the multi-phase winding 2 is a three-phase winding, the three-phase windings are wound in the same direction on the stator core 1 and differ in spatial phase by 120°. For example, the B-phase winding can be shifted 2q slots relative to the A-phase winding 21, and the C-phase winding can be shifted 2q slots relative to the A-phase winding 21 in the opposite direction of the B-phase winding. In this way, since the A-phase winding 21, the B-phase winding, and the C-phase winding are wound in the same manner as the A-phase winding 21 on the stator core 1, after the A-phase winding 21, the B-phase winding, and the C-phase winding are wound on the stator core 1, each branch of the A-phase winding 21, the B-phase winding, and the C-phase winding can traverse the arranged phase belt and slot layer positions, so that the magnetic circuits of each branch in each phase winding are completely symmetrical. Therefore, the potential of each branch of each phase winding remains balanced, and there is no circulating current between the branches.

[0128] Take a 6-pole 54-slot 3-phase motor with 6 layers of flat wire conductors, pole pitch τ = 9, number of slots per pole per phase q = 3, and each phase winding including 2 parallel branches as an example. The phase band references of phase A winding 21, phase B winding and phase C winding are Figure 10 shown.

[0129] Figure 10 Schematic diagram of phase belt distribution of three-phase winding in stator assembly 100 is shown. Figure 10 As shown, n represents the slot number corresponding to the branch or the winding within the branch, and Ln represents the slot layer where the branch or the winding within the branch is located. Ln is L1, L2, L3, L4, L5, and L6 respectively. Multiple slot layers within the same slot body 11 can be represented as L1, L2, L3, L4, L5, and L6 in the direction from the slot bottom 111 to the slot opening 112.

[0130] refer to Figure 10As shown, the two branches of the A-phase winding 21 occupy slots L1 to L6 (i.e., all slots) of the A-phase winding 21 in a corresponding phase band (e.g., the phase band corresponding to slots 1, 2, and 3), and form six conductor layers 26 in each of the three slot bodies 11 corresponding to that phase band, with all six conductor layers 26 being in phase. The two branches of the C-phase winding occupy all slots in each of the C-phase winding in a corresponding phase band (e.g., the phase band corresponding to slots 4, 5, and 6), and form six conductor layers 26 in each of the three slot bodies 11 corresponding to that phase band, with all six conductor layers 26 being in phase. The two branches of the B-phase winding occupy all slots in each of the B-phase winding in a corresponding phase band (e.g., the phase band corresponding to slots 7, 8, and 9), and form six conductor layers 26 in each of the three slot bodies 11 corresponding to that phase band, with all six conductor layers 26 being in phase.

[0131] refer to Figure 11 As shown, the lead wires 27 of each branch in the multi-phase winding 2 can serve as the phase lead wires 27 of the motor, and the lead wires 27 of each branch are connected in parallel. In some embodiments, the lead wires 27 of each branch of each phase winding can be connected together to form a star connection. Taking a three-phase winding (phase A, phase B, phase C) as an example, the tails of the two parallel branches of the A-phase winding 21 are connected to the tails of the two parallel branches of the B-phase winding and the tails of the two parallel branches of the C-phase winding.

[0132] refer to Figure 12 As shown, in other embodiments, the lead wires 27 of each branch of each phase winding can be connected end to end to form a delta connection. Again, taking the three-phase winding (phase A, phase B, phase C) as an example, the two parallel branches of the A-phase winding 21, the two parallel branches of the B-phase winding, and the two parallel branches of the C-phase winding are connected end to end.

[0133] The following describes in detail the winding arrangement of the A-phase winding 21 on the stator core 1 in the stator assembly 100 provided in the present invention, using several embodiments, taking a 6-pole, 54-slot, 3-phase motor with 6 layers of flat wire conductors, a pole pitch τ = 9, a number of slots per pole per phase q = 3, and each phase winding including two parallel branches as an example. The two branches of the A-phase winding 21 are represented by a first branch and a second branch, respectively, for ease of description.

[0134] Example 1

[0135] The first span y of the first branch of the A-phase winding 21 is 9, the second span y1 is 11, the third span y2 is 7, and the fourth span y3 is 8.

[0136] refer to Figure 13 As shown, the arrow direction in the figure is used to illustrate the direction of the current in the conductor of the winding. The winding direction of the first type of coil group on the stator core 1 is the same as the direction of the current in the conductor.

[0137] For the convenience of description, the slot body 11 corresponding to the branch and the slot layer in the slot body 11 are represented by n(Ln), where n(Ln) indicates the Lnth slot layer of slot number n.

[0138] Continue to refer Figure 13 As shown, the winding method of the first type coil group on the stator core 1 is as follows:

[0139] 1(L1)→10(L2)→19(L3)→28(L4)→37(L5)→46(L6)→3(L6)→48(L5)→39(L4)→ 30(L3)→21(L2)→12(L1)→19(L1)→28(L2)→37(L3)→46(L4)→1(L5)→10(L6)→ 21(L6)→12(L5)→3(L4)→48(L3)→39(L2)→30(L1)→37(L1)→46(L2)→1(L3)→ 10(L4)→19(L5)→28(L6)→39(L6)→30(L5)→21(L4)→12(L3)→3(L2)→48(L1)→

[0140] Continue to refer Figure 13 As shown, 1 (L1) serves as the winding starting point for the first type of coil group (branch line inlet 241). The winding within 1 (L1) first spans along the circumference of the stator core 1 in the direction of the arrow (first direction), gradually winding one circle through 10 (L2), 19 (L3), 28 (L4), and 37 (L5) to 46 (L6), forming the first coil group. Then, the winding within 46 (L6) (the end of the first coil group) connects to the second coil group in the same layer along the circumference of the stator core 1 with a second span, beginning the winding of the second coil group on the stator core 1.

[0141] The winding in 3 (L6) serves as the starting point of the second coil group, and spans layers along the arrow direction (second direction) in the circumferential direction of the stator core 1 with the first span, passing through 48 (L5), 39 (L4), 30 (L3), and 21 (L2) in sequence, gradually winding one circle to 12 (L1). The winding of the second coil group is completed and connected to the first coil group in the same layer with the second span, forming the first first coil unit in the first type of coil group.

[0142] At 12 (L1), this first coil unit connects the ends of the first coil group of the adjacent first coil unit in the same layer at the third span along the circumference of the stator core 1. Winding of the next first coil unit in the first type of coil group begins at 19 (L1). Winding of the next first coil unit on the stator core 1 follows the same winding method as the first first coil unit on the stator core 1, starting at 19 (L1) and continuing until 48 (L1), when the connection line of the first type of coil group in the first slot layer is reached. This completes the winding of the first type of coil group on the stator core 1.

[0143] Figure 12 The wiring diagram of the second type coil group in the first branch of the A-phase winding 21 on the stator core 1 is shown. Figure 12 The arrows in the figure are used to illustrate the direction of the current in the conductor of the winding. In the second type of coil group, the winding direction of the winding on the stator core 1 is the same as the direction of the current in the conductor.

[0144] refer to Figure 14 As shown, the winding method of the second type coil group on the stator core 1 is as follows:

[0145] 2(L1)→11(L2)→20(L3)→29(L4)→38(L5)→47(L6)→2(L6)→47(L5)→38(L4)→ 29(Lc)→20(L2)→11(L1)→20(L1)→29(L2)→38(L3)→47(L4)→2(L5)→11(L6)→

[0146] refer to Figure 14 As shown, 2 (L1) serves as the winding starting point for the second type of coil group (branch line inlet 241). The winding within 2 (L1) first spans along the circumference of the stator core 1 in the direction of the arrow (first direction), passing through 11 (L2), 20 (L3), 29 (L4), and 38 (L5), gradually winding one circle to 47 (L6), forming the first coil group of the second type of coil group. Then, the winding within 47 (L6) (the end of the first coil group of the second type of coil group) connects to the second coil group of the second type of coil group in the same layer along the circumference of the stator core 1 with the first span, thus beginning the winding of the second coil group of the second type of coil group on the stator core 1.

[0147] The winding in 2 (L6) serves as the starting point of the second coil group in the second type of coil group, and spans layers along the arrow direction (second direction) in the circumferential direction of the stator core 1 with a first span, and gradually winds one circle through 47 (L5), 38 (L4), 29 (L3), and 20 (L2) in sequence. By 11 (L1), the winding of the second coil group in the second type of coil group is completed, and it is connected to the first coil group in the second type of coil group in the same layer with the first span, forming the first second coil unit in the second type of coil group.

[0148] This second coil unit is connected to the ends of the first coil group of the adjacent second coil unit in the same layer in the first slot layer of slot 11 along the circumference of the stator core 1 at the first span. Winding of the next second coil unit in the second type of coil group begins at 20 (L1). Winding of the next second coil unit on the stator core 1 follows the same winding method for the first second coil unit on the stator core 1, starting at 20 (L1) and continuing until 11 (L6), when the winding reaches the branch outlet 242. This completes the winding of the second type of coil group on the stator core 1.

[0149] Figure 15 FIG2 shows a schematic diagram of the connection of the first branch of the A-phase winding 21 in this embodiment. Figure 15 As shown, the first type of coil group of the first branch of the A-phase winding 21 is connected at 48 (L1) to the second type of coil group at 2 (L1) via a connecting wire having a third span, forming the first branch of the A-phase winding 21. The winding direction of the connecting wire within the first type of coil group in the first branch is the same as the winding direction of the wires on the same layer in the first type of coil group.

[0150] The first span y of the second branch of the A-phase winding 21 is 9, the second span y1 is 11, the third span y2 is 7, and the fourth span y3 is 8.

[0151] Figure 16 The diagram shows a connection diagram of the second branch of the A-phase winding 21 in this embodiment. Figure 16 The arrow direction in FIG is used to illustrate the direction of the current in the conductor of the A-phase winding 21. It should be noted that the winding direction of the first type coil group and the second type coil group in the second branch of the A-phase winding 21 is the same as that of the first type coil group and the second type coil group. Figure 16 The arrows in the figure are in opposite directions.

[0152] refer to Figure 16 As shown, the specific winding method of the first type of coil group in the second branch of the A-phase winding 21 is as follows:

[0153] 28(L1)→37(L2)→46(L3)→1(L4)→10(L5)→19(L6)→30(L6)→21(L5)→12(L4) →3(L3)→48(L2)→39(L1)→46(L1)→1(L2)→10(L3)→19(L4)→28(L5)→37(L6)→ 48(L6)→39(L5)→30(L4)→21(L3)→12(L2)→3(L1)→10(L1)→19(L2)→28(L3) →37(L4)→46(L5)→1(L6)→12(L6)→3(L5)→48(L4)→39(L3)→30(L2)→21(L1)→

[0154] The specific winding method of the second type of coil group in the second branch of the A-phase winding 21 is as follows:

[0155] 29(L1)→38(L2)→47(L3)→2(L4)→11(L5)→20(L6)→29(L6)→20(L5)→11(L4) →2(L3)→47(L2)→38(L1)→47(L1)→2(L2)→11(L3)→20(L4)→29(L5)→38(L6)→

[0156] For a detailed description of the winding methods of the first type coil group and the second type coil group in the second branch, reference may be made to the relevant description of the first branch in this embodiment, and no further elaboration is given here.

[0157] refer to Figure 16 As shown, the first type coil group of the second branch of the A-phase winding 21 is connected to the second type coil group at 29 ( L1 ) through a connecting line with a third span to form the second branch of the A-phase winding 21 .

[0158] It should be noted that when the windings of the first branch and the second branch pass through a certain slot layer of the slot body 11 , a conductor layer 26 may be formed in the slot body 11 . Figures 13 to 16 The grey blocks in the figure represent the conductor layers (not marked in the figure) formed by winding in the corresponding slot layers.

[0159] Figure 17 Schematic diagram of the expansion of the A-phase winding 21 of the first embodiment of the present invention. Figure 17 As shown, A1 and A2 represent the input terminals of the current of the first branch and the second branch in the A-phase winding 21, respectively. X1 and X2 represent the output terminals of the current of the first branch and the second branch in the A-phase winding 21, respectively.

[0160] from Figure 17It can be seen that the winding direction of the first branch is the same as the transmission direction of the current. The input end 241 of the first branch in the A-phase winding 21 corresponds to slot 1, and the output end 242 of the first branch in the A-phase winding 21 corresponds to slot 11. The current of the first branch in the A-phase winding 21 can be input from slot 1 and flow out from slot 11.

[0161] It should be noted that the winding direction of the second branch is opposite to the transmission direction of the current. Figure 17 As can be seen from the figure, the input terminal 241 of the second branch of the A-phase winding 21 corresponds to slot 28, and the output terminal 242 of the first branch corresponds to slot 38. The current of the second branch of the A-phase winding 21 can be input from slot 38 and flow out from slot 28.

[0162] refer to Figures 13 to 8 As shown, the position of the slot corresponding to the inlet end 241 of the first type of coil group in the second branch differs by 27 slots (i.e., it is shifted by 27 slots) relative to the position of the slot corresponding to the inlet end 241 of the first type of coil group in the first branch. When the number of slots is 54, the magnetic circuits of the first branch and the second branch of the A-phase winding 21 are completely symmetrical. In addition, the first branch and the second branch are connected in parallel and arranged in the six slot layers of the corresponding same slot body 11. Among them, the first branch of the A-phase winding 21 occupies three slot layers in the same slot body 11 (for example, slot No. 1), and the second branch of the A-phase winding 21 occupies the remaining three slot layers in the same slot body 11 (for example, slot No. 1).

[0163] Example 2

[0164] The first span y of the first branch of the A-phase winding 21 is 9, the second span y1 is 11, the third span y2 is 7, and the fourth span y3 is 8.

[0165] Figure 18 The diagram shows the connection diagram of the first branch of the A-phase winding 21 of this embodiment. Figure 18 The arrows in the figure illustrate the direction of the current in the conductors of the windings. The winding direction of the first type coil and the second type coil group in the first branch on the stator core 1 is the same as the direction of the current in the conductors.

[0166] refer to Figure 18 As shown, the specific winding method of the first type of coil group in the first branch of the A-phase winding 21 is as follows:

[0167] 3(L1)→12(L2)→21(L3)→30(L4)→39(L5)→48(L6)→37(L6)→28(L5)→19(L4) →10(L3)→1(L2)→46(L1)→39(L1)→48(L2)→3(L3)→12(L4)→21(L5)→30(L6)→ 19(L6)→10(L5)→1(L4)→46(L3)→37(L2)→28(L1)→21(L1)→30(L2)→39(L3) →48(L4)→3(L5)→12(L6)→1(L6)→46(L5)→37(L4)→28(L3)→19(L2)→10(L1)→

[0168] The specific winding method of the second type of coil group in the first branch of the A-phase winding 21 is as follows:

[0169] 2(L1)→11(L2)→20(L3)→29(L4)→38(L51)→47(L6)→38(L6)→29(L5)→20(L4) →11(L3)→2(L2)→47(L1)→38(L1)→47(L2)→2(L3)→11(L4)→20(L5)→29(L6)→

[0170] It should be noted that for the detailed description of the winding methods of the first and second coil groups in the first branch in Example 2, reference may be made to the relevant description of the first branch in Example 1, and no further elaboration is given here.

[0171] Continue to refer Figure 18 As shown, the first type of coil group of the first branch of the A-phase winding 21 is connected at 10 (L1) to the second type of coil group at 2 (L1) via a connecting wire having a third span, forming the first branch of the A-phase winding 21. The winding direction of the connecting wire within the first type of coil group is opposite to the winding direction of the wires on the same layer within the first type of coil group.

[0172] Figure 19 The diagram shows a connection diagram of the second branch of the A-phase winding 21 in this embodiment. Figure 19 The arrow direction in FIG is used to illustrate the direction of the current in the conductor of the A-phase winding 21. It should be noted that the winding direction of the first type coil group and the second type coil group in the second branch of the A-phase winding 21 is the same as that of the first type coil group and the second type coil group. Figure 19 The arrows in the figure are in opposite directions.

[0173] refer to Figure 19 As shown, the specific winding method of the first type of coil group in the second branch of the A-phase winding 21 is as follows:

[0174] 30(L1)→39(L2)→48(L3)→3(L4)→12(L5)→21(L6)→10(L6)→1(L5)→46(L4)→ 37(L3)→28(L2)→19(L1)→12(L1)→21(L2)→30(L3)→39(L4)→48(L5)→3(L6)→ 46(L6)→37(L5)→28(L4)→19(L3)→10(L2)→1(L1)→48(L1)→3(L2)→12(L3)→ 21(L4)→30(L5)→39(L6)→28(L6)→19(L5)→10(L4)→1(L3)→46(L2)→37(L1)→

[0175] refer to Figure 19 As shown, the specific winding method of the second type of coil group in the second branch of the A-phase winding 21 is as follows:

[0176] 29(L1)→38(L2)→47(L3)→2(L4)→11(L5)→20(L6)→11(L6)→2(L5)→47(L4)→ 38(L3)→29(L2)→20(L1)→11(L1)→20(L2)→29(L3)→38(L4)→47(L5)→2(L6)→

[0177] For a detailed description of the winding methods of the first type coil group and the second type coil group in the second branch, reference may be made to the relevant description of the first branch in Example 1, and no further elaboration is given here.

[0178] Continue to refer Figure 19 As shown, the first type coil group of the second branch of the A-phase winding 21 is connected to the second type coil group at 29 ( L1 ) through a connecting line with a third span to form the second branch of the A-phase winding 21 .

[0179] Example 3

[0180] The first span y of the first branch of the A-phase winding 21 is 9, the second span y1 is 7, the third span y2 is 11, and the fourth span y3 is 10.

[0181] Figure 20 This diagram illustrates the wiring of the first type of coil assembly in the first branch of phase A winding 21 on stator core 1. The arrows in the diagram illustrate the direction of current flow within the conductors of the windings. The winding direction of the first type of coil assembly on stator core 1 is the same as the direction of current flow within the conductors.

[0182] Continue to refer Figure 20 As shown, the winding method of the first type coil group on the stator core 1 is as follows:

[0183] 3(L1)→12(L2)→21(L3)→30(L4)→39(L5)→48(L6)→1(L6)→46(L5)→37(L4)→ 28(L3)→19(L2)→10(L1)→21(L1)→30(L2)→39(L3)→48(L4)→3(L5)→12(L6)→ 19(L6)→10(L5)→1(L4)→46(L3)→37(L2)→28(L1)→39(L1)→48(L2)→3(L3)→ 12(L4)→21(L5)→30(L6)→37(L6)→28(L5)→19(L4)→10(L3)→1(L2)→46(L1)→

[0184] Figure 21 The diagram shows the wiring diagram of the second type coil group in the first branch of the A phase winding 21 on the stator core 1. Figure 21 The arrows in the figure are used to illustrate the direction of the current in the conductor of the winding. In the second type of coil group, the winding direction of the winding on the stator core 1 is the same as the direction of the current in the conductor.

[0185] refer to Figure 21 As shown, the winding method of the second type coil group on the stator core 1 is as follows:

[0186] 2(L1)→11(L2)→20(L3)→29(L4)→38(L5)→47(L6)→2(L6)→47(L5)→38(L4)→ 29(Lc)→20(L2)→11(L1)→20(L1)→29(L2)→38(L3)→47(L4)→2(L5)→11(L6)→

[0187] It should be noted that for the detailed description of the winding methods of the first and second coil groups in the first branch in Example 3, reference may be made to the relevant description of the first branch in Example 1, and no further elaboration is given here.

[0188] Figure 22 FIG2 shows a schematic diagram of the connection of the first branch of the A-phase winding 21 in this embodiment. Figure 22 As shown, the first type coil group of the first branch of the A-phase winding 21 is connected to the second type coil group at 2 ( L1 ) through a connecting line with a third span to form the first branch of the A-phase winding 21 .

[0189] The winding direction of the connecting wires in the first type of coil group is the same as the winding direction of the wires in the same layer in the first type of coil group.

[0190] The first span y of the second branch of the A-phase winding 21 is 9, the second span y1 is 7, the third span y2 is 11, and the fourth span y3 is 10.

[0191] Figure 23 The diagram shows a connection diagram of the second branch of the A-phase winding 21 in this embodiment. Figure 23 The arrow direction in FIG is used to illustrate the direction of the current in the conductor of the A-phase winding 21. It should be noted that the winding direction of the first type coil group and the second type coil group in the second branch of the A-phase winding 21 is the same as that of the first type coil group and the second type coil group. Figure 23 The arrows in the figure are in opposite directions.

[0192] refer to Figure 23 As shown, the specific winding method of the first type of coil group in the second branch of the A-phase winding 21 is as follows:

[0193] 30(L1)→39(L2)→48(L3)→3(L4)→12(L5)→21(L6)→28(L6)→19(L5)→10(L4) →1(L3)→46(L2)→37(L1)→48(L1)→3(L2)→12(L3)→21(L4)→30(L5)→39(L6)→ 46(L6)→37(L5)→28(L4)→19(L3)→10(L2)→1(L1)→12(L1)→21(L2)→30(L3) →39(L4)→48(L5)→3(L6)→10(L6)→1(L5)→46(L4)→37(L3)→28(L2)→19(L1)→

[0194] refer to Figure 23 As shown, the specific winding method of the second type of coil group in the second branch of the A-phase winding 21 is as follows:

[0195] 29(L1)→38(L2)→47(L3)→2(L4)→11(L5)→20(L6)→29(L6)→20(L5)→11(L4) →2(L3)→47(L2)→38(L1)→47(L1)→2(L2)→11(L3)→20(L4)→29(L5)→38(L6)→

[0196] For a detailed description of the winding methods of the first type coil group and the second type coil group in the second branch, reference may be made to the relevant description of the first branch in Example 1, and no further elaboration is given here.

[0197] Continue to refer Figure 23 As shown, the first type coil group of the second branch of the A-phase winding 21 is connected to the second type coil group at 29 ( L1 ) through a connecting line with a third span to form the second branch of the A-phase winding 21 .

[0198] Figure 24 The expanded schematic diagram of the A-phase winding of this embodiment is shown. Figure 24 It can be seen that the winding direction of the first branch is the same as the transmission direction of the current. The input end 241 of the first branch in the A-phase winding 21 corresponds to slot 3, and the output end 242 of the first branch in the A-phase winding 21 corresponds to slot 11. The current of the first branch in the A-phase winding 21 can be input from slot 3 and flow out from slot 11.

[0199] It should be noted that the winding direction of the second branch is opposite to the transmission direction of the current. Figure 24 As can be seen from the figure, the input terminal 241 of the second branch of the A-phase winding 21 corresponds to slot 30, and the output terminal 242 of the second branch corresponds to slot 38. The current of the second branch of the A-phase winding 21 can be input from slot 38 and flow out from slot 30.

[0200] Example 4

[0201] The first span y of the first branch of the A-phase winding 21 is 9, the second span y1 is 7, the third span y2 is 11, and the fourth span y3 is 10.

[0202] Figure 25 The diagram shows the connections in the first branch of the A-phase winding 21. The arrows in the diagram illustrate the direction of current flow within the conductors of the windings. The winding direction of the first type of coil assembly around the stator core 1 is the same as the direction of current flow within the conductors.

[0203] Continue to refer Figure 25 As shown, the winding method of the first type coil group on the stator core 1 is as follows:

[0204] 1(L1)→10(L2)→19(L3)→28(L4)→37(L5)→46(L6)→39(L6)→30(L5)→21(L4) →12(L3)→3(L2)→48(L1)→37(L1)→46(L2)→1(L3)→10(L4)→19(L5)→28(L6)→ 21(L6)→12(L5)→3(L4)→48(L3)→39(L2)→30(L1)→19(L1)→28(L2)→37(L3) →46(L4)→1(L5)→10(L6)→3(L6)→48(L5)→39(L4)→30(L3)→21(L2)→12(L1)→

[0205] Continue to refer Figure 25 As shown, the winding method of the second type coil group on the stator core 1 is as follows:

[0206] 2(L1)→11(L2)→20(L3)→29(L4)→38(L5)→47(L6)→38(L6)→29(L5)→20(L4) →11(L3)→2(L2)→47(L1)→38(L1)→47(L2)→2(L3)→11(L4)→20(L5)→29(L6)→

[0207] It should be noted that for the detailed description of the winding methods of the first and second coil groups in the first branch in Example 4, reference may be made to the relevant description of the first branch in Example 1, and no further elaboration is given here.

[0208] refer to Figure 26 As shown, the first type of coil group of the first branch of the A-phase winding 21 is connected to the second type of coil group at 2 ( L1 ) through a connecting line with a third span to form the first branch of the A-phase winding 21 .

[0209] The winding direction of the connecting wires in the first type coil group is opposite to the winding direction of the wires in the same layer in the first type coil group.

[0210] The first span y of the second branch of the A-phase winding 21 is 9, the second span y1 is 7, the third span y2 is 11, and the fourth span y3 is 10.

[0211] Figure 26 The diagram shows a connection diagram of the second branch of the A-phase winding 21 in this embodiment. Figure 26 The arrow direction in FIG is used to illustrate the direction of the current in the conductor of the A-phase winding 21. It should be noted that the winding direction of the first type coil group and the second type coil group in the second branch of the A-phase winding 21 is the same as that of the first type coil group and the second type coil group. Figure 26 The arrows in the figure are in opposite directions.

[0212] refer to Figure 26 As shown, the specific winding method of the first type of coil group in the second branch of the A-phase winding 21 is as follows:

[0213] 28(L1)→37(L2)→46(L3)→1(L4)→10(L5)→19(L6)→12(L6)→3(L5)→48(L4)→ 39(L3)→30(L2)→21(L1)→10(L1)→19(L2)→28(L3)→37(L4)→46(L5)→1(L6)→ 48(L6)→39(L5)→30(L4)→21(L3)→12(L2)→3(L1)→46(L1)→1(L2)→10(L3)→ 19(L4)→28(L5)→37(L6)→30(L6)→21(L5)→12(L4)→3(L3)→48(L2)→39(L1)→

[0214] refer to Figure 26 As shown, the specific winding method of the second type of coil group in the second branch of the A-phase winding 21 is as follows:

[0215] 29(L1)→38(L2)→47(L3)→2(L4)→11(L5)→20(L6)→11(L6)→2(L5)→47(L4)→ 38(L3)→29(L2)→20(L1)→11(L1)→20(L2)→29(L3)→38(L4)→47(L5)→2(L6)→

[0216] For a detailed description of the winding methods of the first type coil group and the second type coil group in the second branch, reference may be made to the relevant description of the first branch in Example 1, and no further elaboration is given here.

[0217] Continue to refer Figure 23 As shown, the first type coil group of the second branch of the A-phase winding 21 is connected to the second type coil group at 29 ( L1 ) through a connecting line with a third span to form the second branch of the A-phase winding 21 .

[0218] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0219] In the description of the present invention, it should be understood that the terms "including" and "having" and any variations thereof used herein are intended to cover non-exclusive inclusions. For example, a process, method, display structure, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0220] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc. should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; they can refer to direct connections or indirect connections through an intermediate medium, allowing internal connectivity between two components or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances. Furthermore, the terms "first," "second," etc., etc., are used for descriptive purposes only and should not be construed to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated.

[0221] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stator assembly, applied to a motor, characterized in that: include: A stator core and a multi-phase winding, wherein the stator core is provided with a plurality of slots in a circumferential direction, each slot having M layers of slots for winding and wiring, where M is an even number greater than or equal to four; each phase of the winding includes at least two branches, each branch including a first coil group, a second coil group, and a connecting wire; The winding wires in the first slot layer are wound across layers along the first direction in the circumferential direction of the stator core to the Mth slot layer with a first span, thereby forming a first coil group; the second coil group has the same structure as the first coil group and is wound in the opposite direction; the first coil group is connected to the second coil group in the same layer with a second span along the circumferential direction of the stator core to form a first coil unit; a plurality of the first coil units are connected in sequence to form a first type of coil group; the second coil group of the first coil unit is connected to the first coil group in the adjacent first coil unit in the same layer with a third span along the circumferential direction of the stator core; The first coil group is connected to the second coil group in the same layer with the first span along the circumference of the stator core to form a second coil unit, and a plurality of the second coil units are connected in sequence to form a second type of coil group; the second coil group of the second coil unit is connected to the first coil group in the adjacent second coil unit in the same layer with the first span along the circumference of the stator core; The connecting wire connects the first type coil group and the second type coil group in the same layer with a fourth span in the circumferential direction of the stator core to form the branch; the second span, the third span and the fourth span are different from the first span, and the size of the fourth span is between the second span and the third span; the branches of the winding of each phase are connected in parallel and arranged in the M slot layers of the corresponding same slot body.

2. The stator assembly according to claim 1, characterized in that The winding starting end of the first type coil group and the winding starting end of the second type coil group are both located in the first slot layer and correspond to different slot bodies; The winding end of the first type coil group is located at the connecting line of the first slot layer, and the winding end of the second type coil group is located at the Mth slot layer.

3. The stator assembly according to claim 2, characterized in that Each branch includes an input end and an output end, and the input end and the output end of each branch correspond to different slot layers of different slot bodies.

4. The stator assembly according to claim 3, characterized in that The winding start end of the first type coil group is located in the slot corresponding to the incoming end of the branch, and the winding end end of the second type coil group is located in the slot corresponding to the outgoing end of the branch.

5. The stator assembly according to any one of claims 1 to 4, characterized in that: Each phase of the winding includes two branches, one of which is arranged in part of the slot layers in the slot body, and the other branch is arranged in the remaining slot layers in the same slot body.

6. The stator assembly according to any one of claims 1 to 4, characterized in that: The first span is equal to the pole pitch of the motor, the pole pitch of the motor is 9, the number of slots per pole per phase is 3, and the second span satisfies the conditional formula: y1=y+2; Wherein, y is the first span, y1 is the second span; The third span satisfies the conditional formula: y2=y-2; Wherein, y2 is the third span.

7. The stator assembly according to claim 6, characterized in that The fourth span satisfies the conditional formula: y3=y-1; Wherein, y3 is the fourth span; The connecting wire is wound in the same direction as or in an opposite direction to the wires in the same layer of the first type coil group.

8. The stator assembly according to any one of claims 1 to 4, characterized in that: The first span is equal to the pole pitch of the motor, the pole pitch of the motor is 9, the number of slots per pole and per phase is 3, and the second span satisfies the conditional formula: y1=y-2; Wherein, y is the first span, y1 is the second span; The third span satisfies the conditional formula: y2=y+2; Wherein, y2 is the third span.

9. The stator assembly according to claim 8, characterized in that The fourth span satisfies the conditional formula: y3=y+1; Wherein, y3 is the fourth span; The connecting wire is wound in the same direction as or in an opposite direction to the wires in the same layer of the first type coil group.

10. The stator assembly according to any one of claims 1 to 4, characterized in that: Two ends of the second coil group and the first coil group connected to each other are two adjacent magnetic poles in the corresponding branch.

Images