A stator assembly

Abstract

The application provides a kind of stator assembly, stator assembly includes stator core and multiphase winding, the circumferential direction of stator core is provided with a plurality of slot bodies, each slot body is provided with M layers of slot layers;Each phase winding includes at least two parallel branches, each branch includes first coil group, second coil group and connecting wire, first coil group is connected with second coil group in the same layer along the circumferential direction of stator core with second span, to form the first coil unit, a plurality of first coil units are sequentially connected to form the first coil group, first coil group is connected with second coil group in the same layer along the circumferential direction of stator core with first span, to form the second coil unit, a plurality of second coil units are sequentially connected to form the second coil group. Connecting wire is connected with first coil group and second coil group in the same layer along the circumferential direction of stator core with fourth span, to form branch. The stator assembly provided by the application cancels the setting of interphase insulation paper in the slot body.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a stator assembly. Background Technology

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

[0003] To address the fast-charging issue of electric vehicles, high-voltage requirements have been placed on the drive motors. Furthermore, increasing the power density of the drive system also necessitates high-voltage requirements for the drive motors. Currently, the stator assembly in a drive motor includes a stator core and multi-phase windings. The stator core has multiple slots distributed circumferentially, with multiple layers forming each phase winding within the same slot. Since these multiple slot layers are located in different phases, insulating paper needs to be placed within the slots to prevent the multiple slot layers within the same slot from being isolated.

[0004] However, the insulating paper between the phases in the slot reduces the slot fill factor of the drive motor, which increases the copper loss and winding temperature rise of the drive motor, limiting the power density of the drive motor, and also increases the insulation cost of the drive motor. Summary of the Invention

[0005] This invention provides a stator assembly that not only eliminates the need for interphase insulation paper in the slots, thereby increasing the slot fill factor of the motor, reducing the insulation cost of the motor, and simplifying the wiring process of the motor, but also eliminates the circulating current problem caused by the asymmetrical winding structure in the stator assembly, thereby improving the efficiency of the motor and reducing the temperature rise of the motor.

[0006] This invention provides a stator assembly for use in a motor. The stator assembly includes a stator core and a multi-phase winding. The stator core has multiple slots circumferentially arranged, and each slot has M layers for winding wiring, where M is an even number greater than or equal to four. Each phase winding includes at least two branches, and each branch includes a first coil group, a second coil group, and a connecting wire.

[0007] The windings in the first slot layer are wound across layers along a first direction in the circumference of the stator core with a first span to the Mth slot layer, forming a first coil group; the second coil group has the same structure as the first coil group but is wound in the opposite direction; the first coil group is connected to the second coil group in the same layer along the circumference of the stator core with a second span to form a first coil unit; multiple first coil units are connected sequentially 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 along the circumference of the stator core with a third span.

[0008] The first coil group is connected to the second coil group in the same layer along the circumference of the stator core with the first span to form a second coil unit. Multiple 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 along the circumference of the stator core with the first span.

[0009] The connecting wire connects the first type of coil group and the second type of coil group in the same layer with a fourth span in the circumference 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 third span is between the second span and the fourth span; each branch of the winding of each phase is connected in parallel and arranged in the M layer of the corresponding slot body.

[0010] In one optional embodiment, the winding start of the first type of coil group and the winding start of the second type of coil group are both located in the first layer of the slot layer and correspond to different slots;

[0011] 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 slot layer of the M layer.

[0012] In one optional implementation, each branch includes an inlet end and an outlet end, and the inlet end and outlet end of each branch correspond to different groove layers of different groove bodies.

[0013] In one alternative implementation, the winding start of the first type of coil group is located in the slot corresponding to the inlet end of the branch, and the winding end of the second type of coil group is located in the slot corresponding to the outlet end of the branch.

[0014] In one alternative implementation, each phase of the winding includes two branches, one branch being disposed within a portion of the slot layer in the slot body, and the other branch being disposed within the remaining slot layer in the same slot body.

[0015] In one optional implementation, 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+1;

[0016] Where y is the first span and y1 is the second span;

[0017] The third span satisfies the condition: y2 = y-1;

[0018] Where y2 is the third span.

[0019] In one alternative implementation, the fourth span satisfies the condition: y3 = y - 2;

[0020] Wherein, y3 is the fourth span;

[0021] The connecting wire has the same or opposite winding direction as the wire in the same layer of the first type of coil group.

[0022] In one optional implementation, 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-1;

[0023] Where y is the first span and y1 is the second span;

[0024] The third span satisfies the condition: y2=y+1;

[0025] Where y2 is the third span.

[0026] In one alternative implementation, the fourth span satisfies the condition: y3 = y + 2;

[0027] Wherein, y3 is the fourth span;

[0028] The connecting wire has the same or opposite winding direction as the wire in the same layer of the first type of coil group.

[0029] In one optional implementation, the two ends of the second coil group and the first coil group that are connected to each other are two adjacent magnetic poles in the corresponding branches.

[0030] This invention provides a stator assembly. By setting at least two branches in each phase winding of the stator assembly, and defining the winding direction and span of the first coil group and the second coil group in each branch within the slot of the stator core, the first coil group and the second coil group can form a first type of coil group and a second type of coil group. Since the connecting line connects the first type of coil group and the second type of coil group in the same layer along the circumference of the stator core, the first type of coil group and the second type of coil group can be connected through the connecting line 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. Based on this, since the branches of each phase winding are connected in parallel and arranged in the M layer of the corresponding slot, it not only ensures that the windings arranged in the same slot of the stator core belong to the same phase, eliminating the need for insulating paper in the same slot to improve the slot fill factor and efficiency of the motor, reduce the temperature rise and insulation cost of the motor, but also simplifies the wiring process of the motor and improves the manufacturing efficiency of the motor. Furthermore, it enables the magnetic circuits of each branch in each phase winding to be completely symmetrical, eliminating the circulating current problem caused by the asymmetrical structure, improving the efficiency of the motor and reducing the temperature rise of the motor. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

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

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

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

[0037] Figure 6 This is a schematic diagram of the structure of the first S-shaped conductor provided in the embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the first type of U-shaped conductor provided in the embodiments of the present invention;

[0039] Figure 8 This is a schematic diagram of the structure of the second type of U-shaped conductor provided in the embodiments of the present invention;

[0040] Figure 9 This is a schematic diagram of the third type of U-shaped conductor provided in the embodiments of the present invention;

[0041] Figure 10 This is a schematic diagram of the phase band distribution of the stator assembly provided in an embodiment of the present invention;

[0042] Figure 11 This is a schematic diagram of the star connection of a multiphase winding provided in an embodiment of the present invention;

[0043] Figure 12 This is the second type of delta connection for multiphase windings provided in the embodiments 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 provided in Embodiment 1 of the present invention on the stator core;

[0045] Figure 14 This is a wiring diagram of the second type of coil group in the first branch of the A-phase winding provided in Embodiment 1 of the present invention on the stator core;

[0046] Figure 15 This is a schematic diagram of the connection of the first branch of the A-phase winding provided in Embodiment 1 of the present invention;

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

[0048] Figure 17 This is a schematic diagram of the unfolded A-phase winding provided in Embodiment 1 of the present invention;

[0049] Figure 18 This is a connection diagram of the first branch of the A-phase winding provided in Embodiment 2 of the present invention;

[0050] Figure 19 This is a schematic diagram of the connection of the second branch of the A-phase winding provided in Embodiment 2 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 in Embodiment 3 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 provided in Embodiment 3 of the present invention on the stator core;

[0053] Figure 22 This is a connection diagram of the first branch of the A-phase winding provided in Embodiment 3 of the present invention;

[0054] Figure 23 This is a schematic diagram of the connection of the second branch of the A-phase winding provided in Embodiment 3 of the present invention;

[0055] Figure 24 This is a schematic diagram of the unfolded A-phase winding provided in Embodiment 3 of the present invention;

[0056] Figure 25 This is a connection diagram of the first branch of the A-phase winding provided in Embodiment 4 of the present invention;

[0057] Figure 26 This is a connection diagram of the second branch of the A-phase winding provided in Embodiment 4 of the present invention.

[0058] Explanation of reference numerals in the attached figures:

[0059] 100-Stator assembly; 1-Stator core; 11-Slot; 111-Slot bottom; 112-Slot opening; 2-Multiphase winding; 21-A-phase winding; 22-Hairpin end; 23-Welding end; 24-Lead end; 241-Inlet end; 242-Outlet end; 25-Conductor; 251-Lead segment; 252-Straight segment; 253-Twist head; 254-Hairpin segment; 255-Welding segment; 26-Conductor layer; 27-Lead wire. Detailed Implementation

[0060] The terminology used in the implementation section of this application is for the purpose of explaining specific embodiments of this application only, and is not intended to limit this application.

[0061] To facilitate understanding, the relevant technical terms in the motors involved in the embodiments of this application will first be explained and described.

[0062] The number of poles in a motor refers to the number of magnetic poles in the motor. 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, which means that the number of pole pairs (P) of the motor is 1.

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

[0064] The number of phases in a motor generally refers to the number of phase wires (i.e., 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 (excluding the neutral wire) on the stator side of the motor.

[0065] The phase band of an electric motor refers to the number of slots on the stator core continuously occupied by each phase winding of each pole.

[0066] Slot fill factor is the ratio of the cross-sectional area of ​​the conductor inside the slot of the sub-core to the effective area of ​​the slot.

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

[0068] Span, also known as pitch, refers to the distance spanned between two elements of the same component on the armature surface in a motor winding, and is usually expressed by the number of slots.

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

[0070] New energy vehicles require motors (such as drive motors) to be lightweight, have high power density, and high efficiency. Compared to conventional round copper wire motors, flat wire motors can achieve a bare copper slot fill factor of over 60%, significantly higher than the 40% fill factor of round copper wire. This increased fill factor, while maintaining the same number of circumferential slots in the stator core, reduces the DC resistance of the stator windings, decreases copper losses, and improves motor efficiency. Therefore, flat wire motors have become an important measure to promote vehicle lightweighting, increase the driving range of electric vehicles, and reduce powertrain costs.

[0071] The fast charging of electric vehicles and the increased power density of drive systems have placed high-voltage demands on electric vehicle motors. To address this, existing technologies have proposed a motor stator winding and a stator and motor using the same. This stator winding employs a short-pitch design, which improves motor efficiency and facilitates high-speed operation, thereby meeting the high-voltage requirements of electric vehicle motors and resolving the fast charging issue.

[0072] However, in the motor stator winding proposed in the related technology, the multiple conductors in the same slot of the stator core are located in different phases. Therefore, it is necessary to install insulating paper in the slot of the stator core where the motor stator winding is wound so as to prevent the multiple conductors in the same slot from being isolated.

[0073] However, the installation of insulating paper not only reduces the slot fill factor of the motor, increases losses such as copper loss and temperature rise of the motor stator winding, limiting the power density of the motor, but also increases the insulation cost of the motor.

[0074] To address the issue of interphase insulation paper being required when multiple conductors in the same slot are located in different winding phases, this invention provides a stator assembly applicable to motors. By improving the winding method of the multi-phase windings in the stator assembly, the need for insulation paper in the circumferential slots of the stator core is eliminated, increasing the slot fill factor, reducing copper losses, and improving motor efficiency. Furthermore, the insulation cost of the stator assembly is reduced, and the wiring process is simplified. In addition, the stator assembly of this invention eliminates the circulating current problem caused by the asymmetrical winding structure, improving motor efficiency and reducing motor temperature rise.

[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 multiphase winding 2. The stator core 1 has a plurality of slots 11 arranged circumferentially. These slots 11 are spaced apart along the circumferential direction of the stator core 1 on its inner side. Each slot 11 has M layers for winding wiring. M is an even number greater than or equal to four; for example, M can be 4, 6, or other even numbers greater than 4. In this invention, the value of M is not further limited. The multiphase winding 2 can also be called a stator winding. Generally, the stator winding has a hairpin end 22 and a welding end 23, distributed on opposite sides of the stator core 1. The structure of the hairpin end 22 in the stator assembly 100 can be referenced... Figure 2 As shown, the structure of the stator assembly 100 at the welding end 23 can be referred to Figure 3 As shown, this is to facilitate understanding of the structure of the stator assembly 100 from different perspectives.

[0077] It should be noted that the slot layer can be understood as the space for winding and wiring arranged sequentially in the direction of the slot depth of the same slot body 11. This space can be a virtual space within the slot body 11, so as to describe the position of the winding in the direction of the slot depth of the slot body 11 when it is wound in the slot body 11.

[0078] Each phase winding may include at least two branches. The number of branches in each phase winding can satisfy the condition: a ≤ M / 2, where a is the number of branches in each phase winding. For example, a can be 2, 3, or other values ​​that satisfy the condition. Here, no further limitation is made on the number of branches in each phase winding.

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

[0080] Continue to refer to Figure 1 As shown, the windings in the first slot layer are wound across layers in the circumference of the stator core 1 along a first direction with a first span, to the Mth slot layer, forming the first coil group. In the field of motors, the windings are generally conductors. (Reference) Figure 4 When the winding is wound in one of the slots of the tank 11, a conductor layer 26 with a conductor can be formed in that slot layer. When the winding is laid in each slot layer of the tank 11, the winding can form an equal number of conductor layers 26 in that slot layer. That is, the tank 11 has M conductor layers 26. The M conductor layers 26 are stacked sequentially in the tank 11 along the slot depth direction.

[0081] In this embodiment of the invention, the winding can be a flat wire conductor. A flat wire conductor can be understood as a conductor with a rectangular cross-section perpendicular to the conductor's axial direction.

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

[0083] Multiple first coil units are connected sequentially to form a first type of coil group. Among them, the second coil group of the first coil unit is connected to the first coil group of the adjacent first coil unit in the same layer along the circumference of the stator core 1 with a third span, so as to realize the connection between two adjacent first coil units in the first type of coil group, thereby enabling multiple first coil units to be connected sequentially to form a first type of coil group.

[0084] It should be noted that the first direction can be a direction on the stator core 1 that has a certain angle with both the axial and circumferential directions of the stator core 1. In the following, specific winding methods of the first direction, the second direction, and the first type of coil group on the stator core 1 will be further explained in specific embodiments.

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

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

[0087] The connecting wires connect the first and second type of coil groups in the same layer with a fourth span in the circumference of the stator core 1 to form branches. The second, third, and fourth spans are different from the first span, and the size of the third span is between the second and fourth spans. The branches of each phase winding are connected in parallel and arranged in the M layer of the corresponding slot 11.

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

[0089] Based on this, since the branches of each phase winding are connected in parallel and arranged in the M layer of the corresponding slot 11, not only can the conductor layers 26 formed by the windings in the same slot all belong to the same phase, eliminating the need for insulating paper in the same slot 11, thereby improving the slot fill factor and efficiency of the motor, reducing the temperature rise and insulation cost of the motor, and simplifying the wiring process of the motor to improve the manufacturing efficiency of the motor, but also can make the magnetic circuits of each branch in each phase winding completely symmetrical, eliminating the circulating current problem caused by the asymmetrical structure of each branch in each phase winding, improving the efficiency of the motor, and reducing the temperature rise of the motor.

[0090] It should be noted that when each branch of each phase winding is formed by connecting the first type of coil group, the second type of coil group and the connecting line, and each branch of each phase winding is connected in parallel and arranged in the M layer of the corresponding slot 11, it is also possible for each branch of each phase winding to traverse the arranged phase band and slot layer position, so that the magnetic circuit of each branch in each phase winding is completely symmetrical. Therefore, the potential of each branch of each phase winding remains balanced and there is no circulating current between branches.

[0091] The winding start points of the first type of coil group and the second type of coil group are both located in the first slot layer and correspond to different slots. 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 slots, but also ensures that the connecting line connects the first type of coil group and the second type of coil group. The branch formed by the first type of coil group and the second type of coil group can traverse the phase band and slot layer positions of each phase winding.

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

[0093] The winding end of the first type of coil group is located at the connection 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 as to facilitate the connection of the winding end of the first type of coil group and the winding start of the second type of coil group in the same layer in the circumferential direction of the stator core.

[0094] Each branch includes an input terminal and an output terminal, and the input and output terminals of each branch correspond to different slot layers of different slot bodies. In some embodiments, the input terminal of a branch may be located in the first slot layer of one of the slot bodies 11, and the output terminal of the branch may be located in the Mth slot layer of one of the slot bodies 11. Alternatively, in other embodiments, the input terminal of a branch may be located in the Mth slot layer of another slot body 11, and the output terminal of the branch may be located in the first slot layer of one of the slot bodies 11. In this invention, the slot body 11 and the corresponding slot layer where the input and output terminals 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 11 corresponding to the inlet end of the branch, and the winding end of the second type of coil group is located in the slot 11 corresponding to the outlet end of the branch, so that the inlet and outlet ends of each branch can correspond to different slot layers of different slots 11. For example, one of the inlet and outlet ends of each branch can correspond to the first slot layer of one slot 11, and the other can correspond to the Mth slot layer of another slot 11.

[0096] like Figure 1 As shown, the inlet (not shown) and outlet (not shown) of the branch constitute the lead end 24 of the branch. In some embodiments, the lead end 24 of the branch may be located on one side of the hairpin end 22 of the stator core 1.

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

[0098] In some embodiments, the number of lead terminals 24 in the stator assembly 100 can be the product of the number of phases of the winding and the number of parallel branches in each phase winding. Taking a three-phase winding with 2 branches in each phase winding as an example, the number of lead terminals 24 in the stator assembly 100 can be 6.

[0099] Taking phase A 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 an example where there are 2 branches in each phase winding, refer to... Figure 5 As shown, in some embodiments, the hairpin end 22 and the welding end 23 of each phase winding are located on opposite sides of the stator core 1.

[0100] refer to Figure 6 , Figure 7 and combined Figure 5 As shown, each branch includes multiple conductors 25 connected in sequence. Conductors 25 may include “S”-shaped conductors and “U”-shaped conductors. Since 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 input end and one at the output end.

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

[0102] The straight segment 252 of the "S"-shaped conductor at the inlet end 241 passes through the first slot layer of the slot body 11, forming a winding in the first slot layer of the branch, and serving as the winding start point of the first type of coil group in the branch. It is wound across layers in the circumference of the stator core 1 along the first direction with a first span, reaching the Mth slot layer, forming the first coil group in the first type of coil group. Furthermore, the lead segment 251 of the "S"-shaped conductor can serve as the lead wire 27 at the inlet end of the branch. The straight segment 252 of the "S"-shaped conductor at the outlet end can pass through the Mth slot layer of the slot body 11, serving as the winding end point of the second type of coil group in the branch. The "S"-shaped conductor at the outlet end can serve as the lead wire 27 at the outlet end of the branch.

[0103] It should be noted that, in addition to the "S"-shaped conductor, the first and second type coil groups in each branch may also include multiple sequentially connected "U"-shaped conductors. (Reference) Figures 7 to 9 As shown, the "U"-shaped conductor may include two welded segments 255, two twist heads 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 each connected to different straight segments 252 via a twist head 253, thereby forming a "U"-shaped conductor. The first type of coil group and the second type of coil group can adopt... Figures 7 to 9 One or more "U"-shaped conductors are used. The straight segment 252 of the "U"-shaped conductor is inserted into one of the slot layers of the slot body 11, the hairpin segment 254 is located at the hairpin end 22 of the winding, and adjacent "U"-shaped conductors are welded at the welding segment 255. In this application, the number and type of "U"-shaped conductors in the first type of coil group and the second type of coil group are not further limited.

[0104] In motor winding wiring, adjacent magnetic poles within a branch of the same winding typically exhibit opposite magnetic properties. In this invention, the two ends connecting the second coil group and the first coil group are adjacent magnetic poles within their respective branches. Specifically, the conductor layer 26 within the slot 11 at the end connecting the first and second coil groups is connected along the circumference of the stator core 1 at a second span, representing the conductor layer 26 corresponding to adjacent magnetic poles. This conductor layer 26 corresponding to adjacent magnetic poles can be understood as the conductor layer 26 within the slot 11 at the end connecting the second and first coil groups.

[0105] In this system, the first and second coil groups, adjacent first coil units, and adjacent second coil units can all be connected by wires of the same layer. Taking the first type of coil group as an example, the first and second coil groups can be connected by wires of the same layer with a second span, and adjacent first coil units can be connected by wires of the same layer with a third span. Since the first type of coil group includes multiple first coil units, and each first coil unit includes a first coil group and a second coil group, the first type of coil group has multiple wires of the same layer with a second span and multiple wires of the same layer with a third span. The winding direction of each wire of the same layer with a second span within the first type of coil group is the same, and the winding direction of each wire of the same layer 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 branch being disposed in a portion of the slot layer in the slot body 11, and the other branch being disposed in the remaining slot layer in the same slot body 11, so as to ensure that each branch of each phase winding is disposed in the corresponding M-layer slot layer 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 have three parallel branches. In this invention, the number of branches in each phase winding is not further limited.

[0108] The structure of the stator assembly 100 of the present invention will be further described below, taking the example of each phase winding having 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+1;

[0110] Where y is the first span and y1 is the second span;

[0111] The third span satisfies the condition: y2 = y-1;

[0112] Where y2 is the third span. Where the fourth span satisfies the condition: y3 = y - 2;

[0113] Where y3 is the fourth span;

[0114] The connecting wires are wound in the same or opposite direction as the wires in the same layer of the first type of coil group.

[0115] This ensures that the first type of coil group and the second type of coil group are connected by connecting lines to form branches, and that each conductor layer 26 in the same slot belongs to the same phase. At the same time, it also makes the magnetic circuits of each branch in each phase winding completely symmetrical.

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

[0117] The number of slots per pole per phase satisfies the condition: q = Q / (2Pm). Where q represents the number of slots per pole per phase, and q can be, 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-1;

[0119] Where y is the first span and y1 is the second span;

[0120] The third span satisfies the condition: y2 = y + 1;

[0121] Where y2 is the third span.

[0122] Among them, the fourth span satisfies the condition: y3=y+2;

[0123] Where y3 is the fourth span;

[0124] The connecting wires are wound in the same or opposite direction as the wires in the same layer of the first type of coil group.

[0125] This ensures that the first type of coil group and the second type of coil group are connected by connecting lines to form branches, while also ensuring 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 slots 11 corresponding to the input ends of the two branches should differ by Q / 2 slots. Q can be, but is not limited to, 54. For example, when the input end of one branch is from slot 11, the input end of the other branch can be from slot 28. In this way, when the two branches are wound on the stator core 1, not only do 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 multiphase winding 2 is a three-phase winding, the three-phase windings are wound in the same direction on the stator core 1 and are 120° out of phase in space. 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 to the B-phase winding. Since the A-phase winding 21, B-phase winding, and C-phase winding are wound in the same way as the A-phase winding 21 on the stator core 1, after the A-phase winding 21, B-phase winding, and C-phase winding are wound on the stator core 1, each branch of the A-phase winding 21, B-phase winding, and C-phase winding can traverse the arranged phase band and slot layer positions, making the magnetic circuit of each branch in each phase winding completely symmetrical. Therefore, the potential of each branch of each phase winding remains balanced, and there is no circulating current between branches.

[0128] Taking 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 for phase A winding 21, phase B winding, and phase C winding are as follows: Figure 10 As shown.

[0129] Figure 10 This diagram illustrates the phase band distribution of the three-phase windings in the stator assembly 100. (Reference) 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 are L1, L2, L3, L4, L5, and L6, respectively. Multiple slot layers within the same slot body 11 can be sequentially represented as L1 layer, L2 layer, L3 layer, L4 layer, L5 layer, and L6 layer along the direction from the slot bottom 111 to the slot opening 112.

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

[0131] refer to Figure 11 As shown, the lead 27 of each branch in the multiphase winding 2 can be used as the phase lead 27 of the motor, and the lead 27 of each branch are connected in parallel. In some embodiments, the lead 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 phase A winding 21 are connected to the tails of the two parallel branches of phase B winding and the tails of the two parallel branches of phase C winding.

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

[0133] The following describes in detail the winding configuration of the A-phase winding 21 on the stator core 1 of the stator assembly 100 provided in this invention, using 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 2 parallel branches as an example, through several embodiments. The two branches in the A-phase winding 21 are respectively represented by the first branch and the second branch for ease of description.

[0134] Example 1

[0135] The first span of the first branch of winding 21 in phase A is y = 9, the second span is y1 = 10, the third span is y2 = 8, and the fourth span is y3 = 7.

[0136] refer to Figure 13 As shown in the figure, the arrows are used to illustrate the direction of current in the conductors of the winding. In the first type of coil group, the winding direction of the wires on the stator core 1 is the same as the direction of current in the conductors.

[0137] For ease of description, the groove 11 corresponding to the branch and the groove layer in the groove 11 are represented by n(Ln), where n(Ln) represents the Lnth groove layer of the nth groove.

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

[0139] 2(L1)→11(L2)→20(L3)→29(L4)→38(L5)→47(L6)→3(L6)→48(L5)→39(L4)→ 30(L3)→21(L2)→12(L1)→20(L1)→29(L2)→38(L3)→47(L4)→2(L5)→11(L6)→ 21(L6)→12(L5)→3(L4)→48(L3)→39(L2)→30(L1)→38(L1)→47(L2)→2(L3)→ 11(L4)→20(L5)→29(L6)→39(L6)→30(L5)→21(L4)→12(L3)→3(L2)→48(L1)→

[0140] Continue to refer to Figure 13 As shown, 2(L1) serves as the starting point for winding the first type of coil group (the inlet end 241 of the branch). The winding in 2(L1) first crosses layers in the circumference of the stator core 1 along the direction of the arrow (first direction) with a first span, successively passing through 11(L2), 20(L3), 29(L4), and 38(L5) to gradually wind one turn, reaching 47(L6), forming the first coil group. Then, the winding in 47(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 inside 3(L6) serves as the beginning of the second coil group. With the first span, it is wound around the stator core 1 in the circumferential direction along the arrow direction (second direction), passing through 48(L5), 39(L4), 30(L3), 21(L2) and gradually winding one turn to 12(L1). The winding of the second coil group is completed, and it is 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] The first coil unit connects to the end of the first coil group in the adjacent first coil unit at 12(L1) along the circumference of the stator core 1 with a third span, and begins winding the next first coil unit in the first type of coil group at 20(L1). The winding of the next first coil unit on the stator core 1 follows the winding method of the first first coil unit on the stator core 1, starting at 20(L1) and continuing until 48(L1), reaching the connection line of the first type of coil group in the first slot layer. The winding of the first type of coil group on the stator core 1 is then completed.

[0143] Figure 12 This illustration shows the wiring diagram of the second type of coil group in the first branch of phase A winding 21 on the stator core 1 in this embodiment. Figure 12 The arrows in the diagram are used to illustrate the direction of current within the conductors of the winding. In the second type of coil group, the winding direction of the wire on the stator core 1 is the same as the direction of current within the conductor.

[0144] refer to Figure 14 As shown, the second type of coil group is wound on the stator core 1 in the following manner:

[0145] 1(L1)→10(L2)→19(L3)→28(L4)→37(L5)→46(L6)→1(L6)→46(L5)→37(L4)→ 28(L3)→19(L2)→10(L1)→19(L1)→28(L2)→37(L3)→46(L4)→1(L5)→10(L6)→

[0146] refer to Figure 14 As shown, 1 (L1) serves as the starting point for winding the second type of coil group (the inlet end 241 of the branch). The winding in 1 (L1) first crosses layers along the direction of the arrow (first direction) in the circumference of the stator core 1 with a first span, successively passing through 10 (L2), 19 (L3), 28 (L4), and 37 (L5) to gradually wind one turn, reaching 46 (L6), forming the first coil group in the second type of coil group. Then, the winding in 46 (L6) (the end of the first coil group in the second type of coil group) connects to the second coil group in the second type of coil group in the same layer along the circumference of the stator core 1 with a first span, beginning the winding of the second coil group in the second type of coil group on the stator core 1.

[0147] The winding in 1(L6) serves as the beginning of the second coil group in the second type of coil group. With the first span, it winds across layers in the circumference of the stator core 1 along the arrow direction (second direction), passing through 46(L5), 37(L4), 28(L3), and 19(L2) to gradually complete one turn. When it reaches 10(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] The second coil unit connects the ends of the first coil group in the adjacent second coil unit at 10(L1) along the circumference of the stator core 1 with a first span, and begins winding the next second coil unit in the second type of coil group at 19(L1). The winding of the next second coil unit on the stator core 1 follows the winding method of the first second coil unit on the stator core 1, starting at 19(L1) and continuing until 10(L6), reaching the outlet end 242 of the branch. The winding of the second type of coil group on the stator core 1 is then completed.

[0149] Figure 15 This diagram illustrates the connection within the first branch of phase A winding 21 in this embodiment. (See reference) Figure 15 As shown, the first type of coil group in the first branch of phase A winding 21 is connected to the second type of coil group in 1 (L1) via a connecting line with a third span, forming the first branch of phase A winding 21. The winding direction of the connecting line in the first type of coil group in the first branch is the same as the winding direction of the same layer of wires in the first type of coil group.

[0150] The first span of the second branch of phase A winding 21 is y = 9, the second span is y1 = 10, the third span is y2 = 8, and the fourth span is y3 = 7.

[0151] Figure 16 This diagram illustrates the connection of the second branch of phase A winding 21 in this embodiment. Figure 16 The arrows in the diagram illustrate the direction of current flow within the conductors of phase A winding 21. It should be noted that the winding directions of the first and second type of coil groups in the second branch of phase A winding 21 are different from those in the diagram. Figure 16 The arrows in the diagrams point 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 phase A winding 21 is as follows:

[0153] 29(L1)→38(L2)→47(L3)→2(L4)→11(L5)→20(L6)→30(L6)→21(L5)→12(L4) →3(L3)→48(L2)→39(L1)→47(L1)→2(L2)→11(L3)→20(L4)→29(L5)→38(L6)→ 48(L6)→39(L5)→30(L4)→21(L3)→12(L2)→3(L1)→11(L1)→20(L2)→29(L3) →38(L4)→47(L5)→2(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 phase A winding 21 is as follows:

[0155] 28(L1)→37(L2)→46(L3)→1(L4)→10(L5)→19(L6)→28(L6)→19(L5)→10(L4) →1(L3)→46(L2)→37(L1)→46(L1)→1(L2)→10(L3)→19(L4)→28(L5)→37(L6)→

[0156] For a detailed description of the winding method of the first type of coil group and the second type of coil group in the second branch, please refer to the relevant description of the first branch in this embodiment, which will not be elaborated further here.

[0157] refer to Figure 16 As shown, the first type of coil group of the second branch of the A-phase winding 21 is connected to the second type of coil group at 28(L1) through a connecting line with a third span, forming the second branch of the A-phase winding 21.

[0158] It should be noted that when the windings of the first and second branches pass through a certain groove layer of the groove 11, a conductor layer 26 can be formed in the groove 11. Figures 13 to 16 The gray blocks in the diagram represent conductor layers formed within the corresponding slots by the winding (not shown in the figure).

[0159] Figure 17 This is a schematic diagram of the unfolded A-phase winding 21 according to Embodiment 1 of the present invention. (See reference) Figure 17 As shown, A1 and A2 represent the input terminals of the current in the first and second branches of the A-phase winding 21, respectively. X1 and X2 represent the output terminals of the current in the first and second branches of the A-phase winding 21, respectively.

[0160] from Figure 17As can be seen, the winding direction of the first branch is the same as the current transmission direction. The input terminal 241 of the first branch in the A-phase winding 21 corresponds to slot 2, and the output terminal 242 of the first branch in the A-phase winding 21 corresponds to slot 10. The current in the first branch of the A-phase winding 21 can be input from slot 2 and flow out from slot 10.

[0161] It should be noted that the winding direction of the second branch is opposite to the direction of current transmission. From Figure 17 As can be seen, in phase A winding 21, the input terminal 241 of the second branch corresponds to slot 29, and the output terminal 242 of the first branch corresponds to slot 37. The current in the second branch of phase A winding 21 can be input from slot 37 and flow out from slot 29.

[0162] refer to Figures 13 to 8 As shown, the position of the slot corresponding to the input end 241 of the first type of coil group in the second branch differs from the position of the slot corresponding to the input end 241 of the first type of coil group in the first branch by 27 slots (i.e., shifted by 27 slots). 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. Furthermore, the first branch and the second branch are connected in parallel and arranged in six slot layers of the same corresponding slot body 11. Among them, the first branch of the A-phase winding 21 occupies three slot layers in the same slot body 11 (e.g., slot 1), and the second branch of the A-phase winding 21 occupies the remaining three slot layers in the same slot body 11 (e.g., slot 1).

[0163] Example 2

[0164] The first span of the first branch of winding 21 in phase A is y = 9, the second span is y1 = 10, the third span is y2 = 8, and the fourth span is y3 = 7.

[0165] Figure 18 This diagram illustrates the connection of the first branch of phase A winding 21 in this embodiment. Figure 18 The arrows in the diagram illustrate the direction of current within the conductors of the windings. In the first branch, the windings of the first type of coil and the second type of coil group are wound in the same direction on the stator core 1 as the current flows through 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 phase A winding 21 is as follows:

[0167] 2(L1)→11(L2)→20(L3)→29(L4)→38(L5)→47(L6)→37(L6)→28(L5)→19(L4) →10(L3)→1(L2)→46(L1)→38(L1)→47(L2)→2(L3)→11(L4)→20(L5)→29(L6)→ 19(L6)→10(L5)→1(L4)→46(L3)→37(L2)→28(L1)→20(L1)→29(L2)→38(L3) →47(L4)→2(L5)→11(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 phase A winding 21 is as follows:

[0169] 3(L1)→12(L2)→21(L3)→30(L4)→39(L51)→48(L6)→39(L6)→30(L5)→21(L4) →12(L3)→3(L2)→48(L1)→39(L1)→48(L2)→3(L3)→12(L4)→21(L5)→30(L6)→

[0170] It should be noted that for the specific description of the winding method of the first type of coil group and the second type of coil group in the first branch in Embodiment 2, please refer to the relevant description of the first branch in Embodiment 1, and will not be elaborated further here.

[0171] Continue to refer to Figure 18 As shown, the first type of coil group in the first branch of phase A winding 21 is connected to the second type of coil group in 3 (L1) via a connecting line with a third span, forming the first branch of phase A winding 21. The winding direction of the connecting line within the first type of coil group is opposite to the winding direction of the same layer of wires within the first type of coil group.

[0172] Figure 19 This diagram illustrates the connection of the second branch of phase A winding 21 in this embodiment. Figure 19 The arrows in the diagram illustrate the direction of current flow within the conductors of phase A winding 21. It should be noted that the winding directions of the first and second type of coil groups in the second branch of phase A winding 21 are different from those in the diagram. Figure 19 The arrows in the diagrams point 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 phase A winding 21 is as follows:

[0174] 29(L1)→38(L2)→47(L3)→2(L4)→11(L5)→20(L6)→10(L6)→1(L5)→46(L4)→ 37(L3)→28(L2)→19(L1)→11(L1)→20(L2)→29(L3)→38(L4)→47(L5)→2(L6)→ 46(L6)→37(L5)→28(L4)→19(L3)→10(L2)→1(L1)→47(L1)→2(L2)→11(L3)→ 20(L4)→29(L5)→38(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 phase A winding 21 is as follows:

[0176] 30(L1)→39(L2)→48(L3)→3(L4)→12(L5)→21(L6)→12(L6)→3(L5)→48(L4)→ 39(L3)→30(L2)→21(L1)→12(L1)→21(L2)→30(L3)→39(L4)→48(L5)→3(L6)→

[0177] For a detailed description of the winding method of the first type of coil group and the second type of coil group in the second branch, please refer to the relevant description of the first branch in Embodiment 1, which will not be elaborated further here.

[0178] Continue to refer to Figure 19 As shown, the first type of coil group of the second branch of the A-phase winding 21 is connected to the second type of coil group at 30 (L1) via a connecting line with a third span, forming the second branch of the A-phase winding 21.

[0179] Example 3

[0180] The first span of the first branch of winding 21 in phase A is y = 9, the second span is y1 = 8, the third span is y2 = 10, and the fourth span is y3 = 11.

[0181] Figure 20 The diagram illustrates the wiring of the first type of coil group in the first branch of phase A winding 21 on the stator core 1. The arrows in the diagram are used to illustrate the direction of current in the conductors 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 current in the conductor.

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

[0183] 2(L1)→11(L2)→20(L3)→29(L4)→38(L5)→47(L6)→1(L6)→46(L5)→37(L4)→ 28(L3)→19(L2)→10(L1)→20(L1)→29(L2)→38(L3)→47(L4)→2(L5)→11(L6)→ 19(L6)→10(L5)→1(L4)→46(L3)→37(L2)→28(L1)→38(L1)→47(L2)→2(L3)→ 11(L4)→20(L5)→29(L6)→37(L6)→28(L5)→19(L4)→10(L3)→1(L2)→46(L1)→

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

[0185] refer to Figure 21 As shown, the second type of coil group is wound on the stator core 1 in the following manner:

[0186] 3(L1)→12(L2)→21(L3)→30(L4)→39(L5)→48(L6)→3(L6)→48(L5)→39(L4)→ 30(L3)→21(L2)→12(L1)→21(L1)→30(L2)→39(L3)→48(L4)→3(L5)→12(L6)→

[0187] It should be noted that for the specific description of the winding method of the first type of coil group and the second type of coil group in the first branch in Embodiment 3, please refer to the relevant description of the first branch in Embodiment 1, and will not be elaborated further here.

[0188] Figure 22 This diagram illustrates the connection within the first branch of phase A winding 21 in this embodiment. (See reference) Figure 22 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 3 (L1) via a connecting line with a third span, forming 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 of the second branch of phase A winding 21 is y = 9, the second span is y1 = 8, the third span is y2 = 10, and the fourth span is y3 = 11.

[0191] Figure 23 This diagram illustrates the connection of the second branch of phase A winding 21 in this embodiment. Figure 23 The arrows in the diagram illustrate the direction of current flow within the conductors of phase A winding 21. It should be noted that the winding directions of the first and second type of coil groups in the second branch of phase A winding 21 are different from those in the diagram. Figure 23 The arrows in the diagrams point 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 phase A winding 21 is as follows:

[0193] 29(L1)→38(L2)→47(L3)→2(L4)→11(L5)→20(L6)→28(L6)→19(L5)→10(L4) →1(L3)→46(L2)→37(L1)→47(L1)→2(L2)→11(L3)→20(L4)→29(L5)→38(L6)→ 46(L6)→37(L5)→28(L4)→19(L3)→10(L2)→1(L1)→11(L1)→20(L2)→29(L3) →38(L4)→47(L5)→2(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 phase A winding 21 is as follows:

[0195] 30(L1)→39(L2)→48(L3)→3(L4)→12(L5)→21(L6)→30(L6)→21(L5)→12(L4) →3(L3)→48(L2)→39(L1)→48(L1)→3(L2)→12(L3)→21(L4)→30(L5)→39(L6)→

[0196] For a detailed description of the winding method of the first type of coil group and the second type of coil group in the second branch, please refer to the relevant description of the first branch in Embodiment 1, which will not be elaborated further here.

[0197] Continue to refer to Figure 23 As shown, the first type of coil group of the second branch of the A-phase winding 21 is connected to the second type of coil group at 30 (L1) via a connecting line with a third span, forming the second branch of the A-phase winding 21.

[0198] Figure 24 This diagram illustrates the unfolded configuration of phase A winding in this embodiment. From... Figure 24 As can be seen, the winding direction of the first branch is the same as the current transmission direction. The input terminal 241 of the first branch in the A-phase winding 21 corresponds to slot 2, and the output terminal 242 of the first branch in the A-phase winding 21 corresponds to slot 12. The current in the first branch of the A-phase winding 21 can be input from slot 2 and flow out from slot 12.

[0199] It should be noted that the winding direction of the second branch is opposite to the direction of current transmission. From Figure 24 As can be seen, in phase A winding 21, the input terminal 241 of the second branch corresponds to slot 29, and the output terminal 242 of the second branch corresponds to slot 39. The current in the second branch of phase A winding 21 can be input from slot 39 and flow out from slot 29.

[0200] Example 4

[0201] The first span of the first branch of winding 21 in phase A is y = 9, the second span is y1 = 8, the third span is y2 = 10, and the fourth span is y3 = 11.

[0202] Figure 25 This diagram illustrates the connection of the first branch of phase A winding 21. The arrows in the diagram are used to illustrate the direction of the current in the conductors of the winding. In the first type of coil group, the winding direction of the wires on the stator core 1 is the same as the direction of the current in the conductors.

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

[0204] 2(L1)→11(L2)→20(L3)→29(L4)→38(L5)→47(L6)→39(L6)→30(L5)→21(L4) →12(L3)→3(L2)→48(L1)→38(L1)→47(L2)→2(L3)→11(L4)→20(L5)→29(L6)→ 21(L6)→12(L5)→3(L4)→48(L3)→39(L2)→30(L1)→20(L1)→29(L2)→38(L3) →47(L4)→2(L5)→11(L6)→3(L6)→48(L5)→39(L4)→30(L3)→21(L2)→12(L1)→

[0205] Continue to refer to Figure 25 As shown, the second type of coil group is wound on the stator core 1 in the following manner:

[0206] 1(L1)→10(L2)→19(L3)→28(L4)→37(L5)→46(L6)→37(L6)→28(L5)→19(L4) →10(L3)→1(L2)→46(L1)→37(L1)→46(L2)→1(L3)→10(L4)→19(L5)→28(L6)→

[0207] It should be noted that for the specific description of the winding method of the first type of coil group and the second type of coil group in the first branch in Embodiment 4, please refer to the relevant description of the first branch in Embodiment 1, and will not be elaborated further 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 1 (L1) via a connecting line with a third span, forming the first branch of the A-phase winding 21.

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

[0210] The first span of the second branch of phase A winding 21 is y = 9, the second span is y1 = 8, the third span is y2 = 10, and the fourth span is y3 = 11.

[0211] Figure 26 This diagram illustrates the connection of the second branch of phase A winding 21 in this embodiment. Figure 26 The arrows in the diagram illustrate the direction of current flow within the conductors of phase A winding 21. It should be noted that the winding directions of the first and second type of coil groups in the second branch of phase A winding 21 are different from those in the diagram. Figure 26 The arrows in the diagrams point 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 phase A winding 21 is as follows:

[0213] 29(L1)→38(L2)→47(L3)→2(L4)→11(L5)→20(L6)→12(L6)→3(L5)→48(L4)→ 39(L3)→30(L2)→21(L1)→11(L1)→20(L2)→29(L3)→38(L4)→47(L5)→2(L6)→ 48(L6)→39(L5)→30(L4)→21(L3)→12(L2)→3(L1)→47(L1)→2(L2)→11(L3)→ 20(L4)→29(L5)→38(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 phase A winding 21 is as follows:

[0215] 28(L1)→37(L2)→46(L3)→2(L4)→10(L5)→19(L6)→10(L6)→1(L5)→46(L4)→ 37(L3)→28(L2)→19(L1)→10(L1)→19(L2)→28(L3)→37(L4)→46(L5)→1(L6)→

[0216] For a detailed description of the winding method of the first type of coil group and the second type of coil group in the second branch, please refer to the relevant description of the first branch in Embodiment 1, which will not be elaborated further here.

[0217] Continue to refer to Figure 23 As shown, the first type of coil group of the second branch of the A-phase winding 21 is connected to the second type of coil group at 28 (L1) via a connecting line with a third span, forming the second branch of the A-phase winding 21.

[0218] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0219] In the description of this invention, it should be understood that the terms “comprising” and “having” as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, display structure, product, or device 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 such process, method, product, or device.

[0220] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0221] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 used in a motor, characterized in that, include: The stator core and multi-phase windings are provided. The stator core has multiple slots around its circumference. Each slot has M layers for winding and wiring, where M is an even number greater than or equal to four. Each phase winding includes at least two branches, and each branch includes a first coil group, a second coil group, and a connecting wire. The windings in the first slot layer are wound across layers along a first direction in the circumference of the stator core with a first span to the Mth slot layer, forming a first coil group; the second coil group has the same structure as the first coil group but is wound in the opposite direction; the first coil group is connected to the second coil group in the same layer along the circumference of the stator core with a second span to form a first coil unit; multiple first coil units are connected sequentially 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 along the circumference of the stator core with a third span. The first coil group is connected to the second coil group in the same layer along the circumference of the stator core with the first span to form a second coil unit. Multiple 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 along the circumference of the stator core with the first span. The connecting wire connects the first type of coil group and the second type of coil group in the same layer with a fourth span in the circumference 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 third span is between the second span and the fourth span; each branch of the winding of each phase is connected in parallel and arranged in the M layer of the corresponding slot body.

2. The stator assembly according to claim 1, characterized in that, The winding start points of the first type of coil group and the winding start points of the second type of coil group are both located in the first layer of the slot layer, and correspond to different slot bodies; 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 slot layer of the M layer.

3. The stator assembly according to claim 2, characterized in that, Each branch includes an inlet and an outlet, and the inlet and outlet of each branch correspond to different tank layers of different tank bodies.

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

5. The stator assembly according to any one of claims 1-4, characterized in that, Each phase winding includes two branches, one of which is located in a portion of the slot layer in the slot body, and the other branch is located in the remaining slot layer in the same slot body.

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

7. The stator assembly according to claim 6, characterized in that, The fourth span satisfies the condition: y3 = y - 2; Wherein, y3 is the fourth span; The connecting wire has the same or opposite winding direction as the wire in the same layer of the first type of coil group.

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

9. The stator assembly according to claim 8, characterized in that, The fourth span satisfies the condition: y3 = y + 2; Wherein, y3 is the fourth span; The connecting wire has the same or opposite winding direction as the wire in the same layer of the first type of coil group.

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

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