Mixed slot layer number stator winding, stator assembly and motor

Abstract

The invention relates to a stator winding with the number of layers of mixed slots, a stator assembly and a motor. The number of poles of the stator assembly is 2p, and an iron core piece is provided with Z conductor slots; every two conductor grooves form a group, the conductor grooves located on the left side are sequentially provided with L1, L2... Lm-1 groove layers, and the conductor grooves located on the right side are sequentially provided with L1, L2... Lm groove layers. The stator winding with the number of mixed slot layers comprises a winding circuit of three phases, each phase comprises n winding branches, each winding branch comprises a plurality of hairpin coils, and the hairpin coils are provided with m / 2 + 1 cross-layer modes: crossing an L1 slot layer and an L2 slot layer, crossing an L3 slot layer and an L4 slot layer,... crossing an Lm-1 slot layer and an Lm slot layer, and crossing the Lm-1 slot layer and the Lm-1 slot layer. The odd-even layer stator winding provided by the invention can effectively reduce the current density / wire load required by the stator assembly, so as to reduce the copper loss, further reduce the temperature of the stator assembly, and avoid the adverse effect on the heat dissipation of a motor.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a stator winding with mixed slot layers, a stator assembly and a motor. Background Art

[0002] The motor may include a stator assembly and a rotor assembly, wherein the stator assembly is fixed in the motor housing, and the rotor assembly is rotatably arranged in the motor housing. When the rotor assembly rotates, it can generate electromagnetic induction with the stator assembly to achieve the conversion between mechanical energy and electrical energy. The motor can be used as a power system for new energy vehicles, such as a generator and an electric motor. When the motor is used in a new energy vehicle, its stator assembly generally includes an iron core and a three-phase stator winding wound on the iron core. For the existing stator assembly, several conductor slots on its iron core generally adopt the same slot design and are used to arrange the effective edges of the same layer; and its stator winding is generally set to a fixed even-numbered layer structure. Under this structure, the required electrical density / line load of the stator assembly is relatively high, and the copper loss heat generation is relatively high, so that the stator assembly has a higher temperature, which is not conducive to the heat dissipation of the motor. Summary of the invention

[0003] Based on this, the present application provides a stator winding with mixed slot layers, a stator assembly and a motor to improve the problem in the prior art that the conductor slots of the core parts adopt the same slot design and the stator winding has a fixed even-numbered layer structure, resulting in a high temperature of the stator assembly.

[0004] In the first aspect, the present application provides a stator winding with a mixed number of slot layers, which is used for a stator assembly, the number of poles of the stator assembly is 2p, and the stator assembly also includes an iron core member, and the iron core member is provided with Z conductor slots at equal intervals along the circumferential direction, wherein Z=12p; among the Z conductor slots, every 2 conductor slots form a group, and in the same group of conductor slots, a conductor slot located on the left is sequentially provided with L1, L2...Lm-1 slot layers, and a conductor slot located on the right is sequentially provided with L1, L2...Lm slot layers, wherein m is an even number not less than 4; the stator winding with a mixed number of slot layers includes winding circuits of three phases, namely, U, V and W, and the winding circuits of the V phase and the W phase are composed of the winding circuits of the U phase. The branches are successively translated by Z / 3p and 2Z / 3p of the conductor slots, and the winding circuit of each phase is completely wound in the two conductor slots constituting the same group, and 4 conductor slots are evenly spaced apart; the winding circuit of each phase includes n parallel winding branches, and each winding branch includes a plurality of hairpin coils, and the hairpin coils include two effective sides arranged at intervals, and the effective sides are arranged in one of the slot layers of the conductor slots; wherein the hairpin coils are arranged with m / 2+1 kinds of cross-layer modes: two effective sides span L1 slot layer and L2 slot layer, two effective sides span L3 slot layer and L4 slot layer...two effective sides span Lm-1 slot layer and Lm slot layer, and two effective sides span Lm-1 slot layer and Lm-1 slot layer.

[0005] In one embodiment, the hairpin coil also includes a welding end and a hairpin end, two welding ends are provided, and the two welding ends are provided at the same end of the two effective sides, and the hairpin end is connected to the other ends of the two effective sides. The hairpin coil is provided with two types: a stacked coil and a reverse twisted coil. The two welding ends of the stacked coil extend in a direction approaching each other, and the two welding ends of the reverse twisted coil extend in the same direction. The cross-layer method is that the two effective sides span L1 slot layer and L2 slot layer, the two effective sides span L3 slot layer and L4 slot layer... The two effective sides span Lm-1 slot layer and Lm slot layer, and the hairpin coils are both the stacked coils. The cross-layer method is that the two effective sides span Lm-1 slot layer and Lm-1 slot layer, and the hairpin coils are both the reverse twisted coils.

[0006] In one embodiment, each winding branch further includes a bridge wire, the bridge wire connects the two hairpin coils, and the two hairpin coils connected by the bridge wire are both the stacked coils.

[0007] In one embodiment, the hairpin coils in the same cross-layer manner all have the same pitch.

[0008] In one embodiment, Z=48, p=4, m=6, n=2 or 4, and the cross-layer method is that the pitch of the hairpin coils of the two effective side spans L1 slot layer and L2 slot layer, the two effective side spans L3 slot layer and L4 slot layer, the two effective side spans L5 slot layer and L6 slot layer, and the two effective side spans L5 slot layer and L5 slot layer are all 6 slots.

[0009] In one embodiment, any winding branch has an input line from the L1 slot layer of the conductor slot and an output line from the L1 slot layer of the conductor slot.

[0010] In one embodiment, when n=4, the first winding branch of the U phase is:

[0011] 1#L1-7#L2-2#L1-8#L2-1#L3-7#L4-2#L3-8#L4-1#L5-7#L6-2#L5-8#L5-13#L6-7#L5-14#L4-8#L3-13#L4-7#L3-14#L2-8#L1-13#L2-7#L1;

[0012] The second winding branch of the U phase is:

[0013] 13#L1-19#L2-14#L1-20#L2-13#L3-19#L4-14#L3-20#L4-13#L5-19#L6-14#L5- 20#L5-25#L6-19#L5-26#L4-20#L3-25#L4-19#L3-26#L2-20#L1-25#L2-19#L1;

[0014] The third winding branch of the U phase is:

[0015] 25#L1-31#L2-26#L1-32#L2-25#L3-31#L4-26#L3-32#L4-25#L5-31#L6-26#L5- 32#L5-37#L6-31#L5-38#L4-32#L3-37#L4-31#L3-38#L2-32#L1-37#L2-31#L1;

[0016] The fourth winding branch of the U phase is:

[0017] 37#L1-43#L2-38#L1-44#L2-37#L3-43#L4-38#L3-44#L4-37#L5-43#L6-38# L5-44#L5-1#L6-43#L5-2#L4-44#L3-1#L4-43#L3-2#L2-44#L1-1#L2-43#L1.

[0018] In one embodiment, when n=2, the first winding branch of the U phase is:

[0019] 1#L1-7#L2-2#L1-8#L2-1#L3-7#L4-2#L3-8#L4-1#L5-7#L6-2#L5-8#L5-1 3#L6-7#L5-14#L4-8#L3-13#L4-7#L3-14#L2-8#L1-13#L2-7#L1-13#L1-19 #L2-14#L1-20#L2-13#L3-19#L4-14#L3-20#L4-13#L5-19#L6-14#L5-20#L 5-25#L6-19#L5-26#L4-20#L3-25#L4-19#L3-26#L2-20#L1-25#L2-19#L1;

[0020] The second winding branch of the U phase is:

[0021] 25#L1-31#L2-26#L1-32#L2-25#L3-31#L4-26#L3-32#L4-25#L5-31#L6-26#L 5-32#L5-37#L6-31#L5-38#L4-32#L3-37#L4-31#L3-38#L2-32#L1-37#L2-31# L1-37#L1-43#L2-38#L1-44#L2-37#L3-43#L4-38#L3-44#L4-37#L5-43#L6-38 #L5-44#L5-1#L6-43#L5-2#L4-44#L3-1#L4-43#L3-2#L2-44#L1-1#L2-43#L1.

[0022] In a second aspect, the present application provides a stator assembly, wherein the stator assembly includes any one of the mixed slot layer stator windings provided in the present application.

[0023] In a third aspect, the present application provides a motor, which includes any stator assembly provided in the present application.

[0024] The present application can prepare the required odd-even layer stator winding by setting the conductor slots of the core piece to a mixed slot type of m-1 slot layers and m slot layers, and reasonably setting the combination form and number of the conductor slots, and by reasonably setting the cross-layer mode of the hairpin coils of the stator winding. It has been verified that compared with the stator winding with the same slot type of the conductor slots of the core piece and an even-numbered layer design, the odd-even layer stator winding provided by the present application can effectively reduce the required electrical density / wire load of the stator assembly, so as to reduce copper loss, thereby reducing the temperature of the stator assembly and avoiding adverse effects on the heat dissipation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a stator winding with mixed slot layers provided in an embodiment of the present application when it is wound on an iron core member;

[0026] Figure 2 A schematic diagram of winding of a stator winding with mixed slot layers provided in an embodiment of the present application, which has 48 slots, 8 poles, 6 layers and 4 branches in parallel;

[0027] Figure 3 A schematic diagram of winding of the U phase when the stator winding with mixed slot layers provided in an embodiment of the present application is 48 slots, 8 poles, 6 layers and 4 branches in parallel;

[0028] Figure 4 A schematic diagram of the structure of a stacked coil of a stator winding with mixed slot layers provided in Example 1 of the present application;

[0029] Figure 5 A schematic diagram of the structure of the reverse twisted coil of the stator winding with mixed slot layers provided in Example 1 of the present application;

[0030] Figure 6 A schematic diagram of winding of the U phase when the stator winding with mixed slot layers provided in an embodiment of the present application is 48 slots, 8 poles, 6 layers and 2 branches in parallel;

[0031] Figure 7 A schematic diagram of the structure of the bridge wire of the stator winding with mixed slot layers provided in Example 1 of the present application;

[0032] Figure 8 A comparison diagram of stator transient temperature curves of Example 1 and a comparative example provided for application Example 1 of the present application;

[0033] Fig. 9 Output performance comparison diagram of Example 1 and Comparative Example provided for application Example 2 of this application;

[0034] Fig.10 The reverse potential spectrum diagram of the comparative example provided for the application of Example 2 of the present application;

[0035] Fig.11The reverse potential spectrum diagram of Example 1 provided for Application Example 3 of the present application;

[0036] Fig.12 A comparison diagram of the back electromotive force of Example 1 and the comparative example provided for application Example 4 of the present application.

[0037] Figure numerals: 100, hairpin coil; 100a, lapped coil; 100b, reverse twisted coil; 110, effective edge; 120, welding end; 130, hairpin end; 200, bridge line; 210, bridge connecting line; 220, bridge welding end; 300, phase copper busbar; 400, star point copper busbar; 500, core piece; 510, conductor slot. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0040] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0041] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] Embodiment 1

[0043] Embodiment 1 of the present application provides a stator winding with mixed slot layers, such as Figures 1 to 7As shown, the mixed slot layer stator winding is used for a stator assembly, the number of poles of the stator assembly is 2p, and the stator assembly also includes an iron core 500, and the iron core 500 is provided with Z conductor slots 510 at equal intervals along the circumferential direction, wherein Z=12p; among the Z conductor slots 510, every two conductor slots 510 form a group, and in the same group of conductor slots 510, a conductor slot 510 located on the left is sequentially provided with L1, L2...Lm-1 slot layers, and a conductor slot 510 located on the right is sequentially provided with L1, L2...Lm slot layers, wherein m is an even number not less than 4; the mixed slot layer stator winding includes winding circuits of three phases, U, V and W, and the winding circuits of the V phase and the W phase are sequentially translated by the winding branch of the U phase by Z / 3p and 2Z / 3p conductors. The slots 510 are obtained, and the winding circuit of each phase is completely wound in the two conductor slots 510 constituting the same group, and 4 conductor slots 510 are evenly spaced; the winding circuit of each phase includes n parallel winding branches, each winding branch includes a plurality of hairpin coils 100, and the hairpin coil 100 includes two effective edges 110 arranged at intervals, and the effective edges 110 are arranged in one of the slot layers of the conductor slots 510; wherein, the hairpin coil 100 is provided with m / 2+1 kinds of cross-layer modes: two effective edges 110 span L1 slot layer and L2 slot layer, two effective edges 110 span L3 slot layer and L4 slot layer...two effective edges 110 span Lm-1 slot layer and Lm slot layer, and two effective edges 110 span Lm-1 slot layer and Lm-1 slot layer.

[0044] like Figure 1As shown, in this embodiment, it is exemplarily explained that the stator assembly may include p pairs of magnetic poles, in which case the number of poles is 2p, or the number of pole pairs is p, where p is a positive integer. The stator assembly may specifically include a core piece 500 and a stator winding, wherein the core piece 500 may be composed of a plurality of punching sheets, and the plurality of punching sheets may specifically adopt a stacking preparation process. The core piece 500 may be configured as a hollow cylindrical structure, and the conductor slot 510 may be disposed on the inner side of the core piece 500, and the conductor slot 510 may be disposed at equal intervals along the circumferential direction with Z number, wherein Z may be set to 12p. The conductor slot 510 may be used to arrange the conductor wound into the stator winding, and according to the different positions of the conductors arranged in the conductor slot 510, the conductor slot 510 may be divided into a plurality of slot layers along the radial direction of the core piece 500, and each slot layer of the conductor slot 510 is used to arrange a layer of conductor. The number of slot layers of the conductor slot 510 in this embodiment is m-1 or m, where m is an even number not less than 4. The m-1 or m slot layers can be represented by L1, L2...Lm-1 or Lm in sequence. When it is necessary to explain, the mark "Lm" is only for the convenience of describing the slot layer, and is not used to limit it in any way. In some embodiments, several slot layers of the conductor slot 510 can also be represented by other marks. Along the radial direction of the core member 500, the L1...Lm-1 and Lm slot layers of the conductor slot 510 are arranged in sequence from the inside to the outside. It is not difficult to see that the conductor slot 510 with m slot layers must have a greater length than the conductor slot 510 with m-1 slot layers. In the aforementioned Z conductor slots 510, every 2 conductor slots 510 are arranged as a group, and in this embodiment, Z / 2 groups of conductor slots 510 are arranged. In the same group of conductor slots 510, a conductor slot 510 located at the left side has m-1 slot layers, and a conductor slot 510 located at the right side has m slot layers. The aforementioned left side position and right side position may be relative positions when the two conductor slots 510 in the same group are observed from an angle of looking down at the end of the core member 500. In some embodiments, the left side position and the right side position may be adaptively interchangeable.

[0045] like Figure 1 and Figure 2As shown, the number of phases of the stator assembly can be three phases, which is suitable for a three-phase motor, and the three phases can be U phase, V phase and W phase respectively. The marks "U", "V" and "W" are only for the convenience of describing the three phases of the stator assembly, and are not used to limit it in any way. In some embodiments, the three phases of the stator assembly can also be illustrated by other marks. When the stator assembly is three-phase, its stator winding correspondingly includes winding branches of three phases, namely, winding circuits of U phase, V phase and W phase. For the winding branch of any phase, it is completely wound in two consecutive conductor slots 510, and the two conductor slots 510 are in the same group. At the same time, the winding circuit of any phase is also evenly spaced by four conductor slots 510. Furthermore, the winding circuit of the V phase and the winding circuit of the W phase can be obtained by translating the winding circuit of the U phase by Z / 3p=4 and 2Z / 3p=8 conductor slots 510 respectively; under this structure, the winding circuits of the U phase, V phase and W phase can be arranged in a staggered manner without overlapping and interference, and the winding circuits of the U phase, V phase and W phase can just fill the Z conductor slots 510.

[0046] like Figure 3 As shown, in this embodiment, the winding circuit of any phase also includes n winding branches, where n is a positive integer not less than 2, and the n winding branches are connected in parallel. n can be set to different values ​​according to actual needs, such as n=2 or 4, etc., to obtain various motors such as low voltage or high voltage. For any winding branch, it includes a plurality of hairpin coils 100. The hairpin coil 100 is made of a conductor, for example, a flat enameled wire. In this case, the motor can be called a flat wire motor, which has a relatively high slot fill rate. During winding, the hairpin coil 100 can be wound on the iron core 500 in the form of a slot, and the hairpin coil 100 is at least partially wound in the conductor slot 510. The portion of the hairpin coil 100 wound in the conductor slot 510 can be called its effective edge 110. In this embodiment, the plurality of hairpin coils 100 are each provided with two effective edges 110, and the two effective edges 110 are arranged at intervals and are respectively arranged in one of the slot layers of a conductor slot 510. In this structure, the hairpin coil 100 is shaped like a "U" and can therefore be referred to as a "U"-shaped wire.

[0047] In this embodiment, several hairpin coils 100 all have designated cross-layer modes, and there are specifically m / 2+1 types of cross-layer modes, wherein the first type is that the two effective edges 110 of the hairpin coil 100 span the L1 slot layer and the L2 slot layer, the second type is that the two effective edges 110 of the hairpin coil 100 span the L3 slot layer and the L4 slot layer... The m / 2th type is that the two effective edges 110 of the hairpin coil 100 span the Lm-1 slot layer and the L1 slot layer, and the m / 2+1th type is that the two effective edges 110 of the hairpin coil 100 span the Lm-1 slot layer and the Lm-1 slot layer. For example, when m=6, there are four ways of crossing layers of the plurality of hairpin coils 100: two effective edges 110 cross the L1 slot layer and the L2 slot layer, two effective edges 110 cross the L3 slot layer and the L4 slot layer, two effective edges 110 cross the L5 slot layer and the L6 slot layer, and two effective edges 110 cross the L5 slot layer and the L5 slot layer.

[0048] It is understandable that the present application can prepare the required odd-even layer stator winding by setting the several conductor slots 510 of the core member 500 to a mixed slot type of m-1 slot layers and m slot layers, and reasonably setting the combination form and number of the several conductor slots 510, and by reasonably setting the cross-layer mode of the several hairpin coils 100 of the stator winding. It has been verified that compared with the stator winding with the same slot type of the several conductor slots 510 of the core member 500 and an even-numbered layer design, the odd-even layer stator winding provided by the present application can effectively reduce the required electrical density / wire load of the stator assembly, so as to reduce copper loss, thereby reducing the temperature of the stator assembly and avoiding adverse effects on the heat dissipation of the motor.

[0049] Specifically, the hairpin coil 100 also includes a welding end 120 and a hairpin end 130. Two welding ends 120 are provided. The two welding ends 120 are provided at the same end of the two effective edges 110. The hairpin end 130 is connected to the other end of the two effective edges 110. The hairpin coil 100 is provided with two types of stacked coils 100a and reverse twisted coils 100b. The two welding ends 120 of the stacked coil 100a extend in directions approaching each other, and the two welding ends 120 of the reverse twisted coil 100b extend in the same direction. The cross-layer mode is that the two effective edges 110 span the L1 slot layer and the L2 slot layer, the two effective edges 110 span the L3 slot layer and the L4 slot layer... The hairpin coil 100 whose two effective edges 110 span the Lm-1 slot layer and the Lm slot layer are both stacked coils 100a, and the hairpin coil 100 whose two effective edges 110 span the Lm-1 slot layer and the Lm-1 slot layer are both reverse twisted coils 100b.

[0050] like Figure 4 and Figure 5As shown, in this embodiment, the hairpin coil 100 can be integrally formed, and in addition to the effective edge 110, it can also include a welding end 120 and a hairpin end 130. The welding end 120 is arranged in a one-to-one correspondence with the effective edge 110, and the two welding ends 120 can be connected to the same end of the corresponding effective edge 110; and the hairpin end 130 can be connected between the other ends of the two effective edges 110.

[0051] The plurality of hairpin coils 100 of any winding branch are all set to two shapes, namely, the lapped coil 100a and the reverse twisted coil 100b. When the hairpin coil 100 is a lapped coil 100a, its two welding ends 120 extend obliquely in a direction close to each other and form a closed shape; when the hairpin coil 100 is a reverse twisted coil 100b, its two welding ends 120 extend obliquely in the same direction. When the hairpin coil 100 is a lapped coil 100a, its hairpin end 130 can be set to a shape similar to a "V" shape; when the hairpin coil 100 is a reverse twisted coil 100b, its hairpin end 130 can be set to a shape similar to a "U" shape. When the plurality of hairpin coils 100 are wound continuously, two lapped coils 100a can be adjacent and connected, and the two lapped coils 100a are connected through one of their welding ends 120 respectively, and the two welding ends 120 can be welded and fixed. Meanwhile, a lapped coil 100a may be connected to a reverse twisted coil 100b, in which case a welding end 120 of the lapped coil 100a is connected to a welding end 120 of the reverse twisted coil 100b, and the connection method may also be welding.

[0052] In this embodiment, when the cross-layer mode of the hairpin coil 100 is specified, its shape is also specified. Specifically, the hairpin coil 100 with two effective sides 110 spanning L1 slot layer and L2 slot layer, two effective sides 110 spanning L3 slot layer and L4 slot layer, etc., is a stacked coil 100a; and the hairpin coil 100 with two effective sides 110 spanning Lm-1 slot layer and Lm-1 slot layer is a reverse twisted coil 100b.

[0053] It can be understood that in this embodiment, the multiple hairpin coils 100 are arranged into two shapes of stacked coils 100a and reverse twisted coils 100b according to the cross-layer manner of the multiple hairpin coils 100, so as to facilitate winding the multiple hairpin coils 100 on the core member 500 in a specified cross-layer manner to prepare the required stator assembly.

[0054] More specifically, each winding branch further includes a bridge wire 200 , and the bridge wire 200 connects two hairpin coils 100 , and the two hairpin coils 100 connected by the bridge wire 200 are both stacked coils 100 a .

[0055] like Figure 6 and Figure 7 As shown, in this embodiment, it is exemplarily explained that for any winding branch, during the winding process of several hairpin coils 100, if the connection positions of two hairpin coils 100 are far apart, that is, the welding ends 120 for connecting the two hairpin coils 100 are far apart, the two hairpin coils 100 can also be connected through a bridge wire 200. It should be noted that the bridge wire 200 in this embodiment can be used to connect two stacked coils 100a whose connection positions are far apart. The bridge wire 200 can also be integrally prepared by flat enameled wire, which can specifically include a bridge connection wire 210 and a bridge welding end 220. The bridge welding end 220 can be set to two, so as to correspond to the two stacked coils 100a one by one; the two bridge welding ends 220 are respectively set close to one welding end 120 of the two stacked coils 100a, and are welded and fixed for connection. The bridge connection line 210 may be configured to be arc-shaped and extend along the circumference of the core member 500 to connect the two bridge welding ends 220 .

[0056] It can be understood that, in this embodiment, by providing the bridge wire 200 , it is convenient to connect the winding branches when the two hairpin coils 100 are far apart at the connection positions, so as to obtain the stator winding with the required number of mixed slot layers.

[0057] More specifically, the hairpin coils 100 of the same cross-layer manner all have the same pitch.

[0058] like Figure 3 and Figure 6 As shown, in this embodiment, it is exemplarily explained that the pitch of the hairpin coil 100 is the number of conductor slots 510 spaced between its two effective sides 110. It should be noted that when the hairpin coil 100 is of the same shape, adopts the same cross-layer method and has the same pitch, it can be defined as a hairpin coil 100 of the same linear type; and when one of them is not satisfied, it should be defined as a hairpin coil 100 of different linear types. In this embodiment, the hairpin coil 100 has two shapes, namely, the stacked coil 100a and the reverse twisted coil 100b. The stacked coil 100a has m / 2 cross-layer methods, and among the stacked coils 100a with m / 2 cross-layer methods, the stacked coils 100a with the same cross-layer method have the same pitch. Under this structure, the stacked coil 100a has m / 2 linear types. The reverse twisted coil 100b has only one cross-layer method and only one pitch. In this structure, the anti-twist coil 100b also has only one type or line type.

[0059] For example, when m=6, the pitch of the stacked coil 100a with two effective sides 110 crossing the L1 slot layer and the L2 slot layer can be set to 6 slots, which is the first line type of the stacked coil 100a; the pitch of the stacked coil 100a crossing the L3 slot layer and the L4 slot layer can be set to 6 slots, which is the second line type of the stacked coil 100a; the pitch of the stacked coil 100a crossing the L5 slot layer and the L6 slot layer can be set to 6 slots, which is the third line type of the stacked coil 100a. The pitch of the reverse twisted coil 100b with two effective sides 110 crossing the L5 slot layer and the L5 slot layer can be set to 6 slots, which is the only line type of the reverse twisted coil 100b.

[0060] It can be understood that in this embodiment, the hairpin coils 100 of the same shape and the same cross-layer method are set to the same pitch, which can simplify the line types of the hairpin coils 100, thereby making it less likely to make mistakes during the winding process of the stator winding, and at the same time improve the winding efficiency of the stator winding.

[0061] More specifically, Z=48, p=4, m=6, n=2 or 4, and the cross-layer manner is that two effective edges 110 span L1 slot layer and L2 slot layer, two effective edges 110 span L3 slot layer and L4 slot layer, two effective edges 110 span L5 slot layer and L6 slot layer, and two effective edges 110 span L5 slot layer and L5 slot layer, and the pitch of the hairpin coil 100 is 6 slots.

[0062] like Figure 3 and Figure 6 As shown, in this embodiment, it is exemplarily explained that when Z=48, p=4, m=6, n=2 or 4, the odd-even layer stator winding constitutes a three-phase stator winding with 48 slots, 8 poles, 6 layers, 2 branches in parallel or 4 branches in parallel. In the stator winding, a plurality of hairpin coils 100 include three types of lapped coils 100a and one type of reverse twisted coil 100b. The three types of lapped coils 100a are respectively two effective sides 110 spanning L1 slot layer and L2 slot layer with a pitch of 6 slots, two effective sides 110 spanning L3 slot layer and L4 slot layer with a pitch of 6 slots, and two effective sides 110 spanning L5 slot layer and L6 slot layer with a pitch of 6 slots; one type of reverse twisted coil 100b is two effective sides 110 spanning L5 slot layer and L5 slot layer with a pitch of 6 slots.

[0063] It can be understood that this embodiment facilitates winding of a three-phase stator winding with 54 slots, 6 poles, 6 layers, 2 branches in parallel or 4 branches in parallel by reasonably setting the pitch and cross-layer mode of a plurality of hairpin coils 100.

[0064] More specifically, any winding branch has an input line from the L1 slot layer of the conductor slot 510 , and has an output line from the L1 slot layer of the conductor slot 510 .

[0065] like Figure 3 and Figure 6 As shown, in this embodiment, the L1 slot layer of the conductor slot 510 is exemplarily described as the slot layer of the conductor slot 510 that is closest to the axis of the core member 500, and is located at the innermost side of the conductor slot 510. For any winding branch, there is a wire entry position and a wire exit position during the winding process, that is, the starting position and the end position of the winding. The winding branches in this embodiment are all wired from the innermost side of the conductor slot 510, and the wires are exited from the innermost side of the conductor slot 510, that is, the wire entry position and the wire exit position are both set to the L1 slot layer of the conductor slot 510.

[0066] It can be understood that this embodiment reasonably sets the incoming line position and the outgoing line position of any winding branch, so that when the winding lines of the three phases are subsequently introduced and led out, the incoming line position and the outgoing line position of the winding lines of the three phases are connected with the phase copper bus 300 and the star point copper bus 400.

[0067] More specifically, when n=4, the first winding branch of phase U is:

[0068] 1#L1-7#L2-2#L1-8#L2-1#L3-7#L4-2#L3-8#L4-1#L5-7#L6-2#L5-8#L5-13#L6-7#L5-14#L4-8#L3-13#L4-7#L3-14#L2-8#L1-13#L2-7#L1;

[0069] The second winding branch of phase U is:

[0070] 13#L1-19#L2-14#L1-20#L2-13#L3-19#L4-14#L3-20#L4-13#L5-19#L6-14#L5- 20#L5-25#L6-19#L5-26#L4-20#L3-25#L4-19#L3-26#L2-20#L1-25#L2-19#L1;

[0071] The third winding branch of phase U is:

[0072] 25#L1-31#L2-26#L1-32#L2-25#L3-31#L4-26#L3-32#L4-25#L5-31#L6-26#L5- 32#L5-37#L6-31#L5-38#L4-32#L3-37#L4-31#L3-38#L2-32#L1-37#L2-31#L1;

[0073] The fourth winding branch of phase U is:

[0074] 37#L1-43#L2-38#L1-44#L2-37#L3-43#L4-38#L3-44#L4-37#L5-43#L6-38# L5-44#L5-1#L6-43#L5-2#L4-44#L3-1#L4-43#L3-2#L2-44#L1-1#L2-43#L1.

[0075] like Figure 3 and Figure 6 As shown, in this embodiment, 48 conductor slots 510 can be represented by serial numbers "1#" to "48#", and the serial numbers "1#" to "48#" are only for the convenience of describing the 48 conductor slots 510, and are not used to limit them. Any conductor slot 510 of the core member 500 can be used as the conductor slot 510 with serial number "1#", and the serial number can be increased in the clockwise direction of the core member 500 or in the counterclockwise direction of the core member 500, and there is no specific limitation. It should be noted that when the conductor slot 510 is wound along the direction of increasing serial number and continues to be wound, the serial number of the conductor slot 510 is re-expressed as "1#"-"48#". For example, when the hairpin coil 100 with a pitch of 6 slots is first wound in the conductor slot 510 with serial number "46#", it is then wound across 6 conductor slots 510 in the conductor slot 510 with serial number "46#+6#-48#=4#". When the conductor slot 510 is wound along the direction of decreasing serial number and completes a circle, the same can be obtained.

[0076] like Figure 3 As shown, the first winding branch of the U phase is taken as an example for explanation. In the first winding branch of the U phase, the line corresponding to "1#L1-7#L2" is the first hairpin coil 100 of the first winding branch, which is in the shape of a lapped coil 100a, and its two effective sides 110 are respectively wound on the L1 slot layer of the conductor slot 510 with the serial number "1#" and the L2 slot layer of the conductor slot 510 with the serial number "7#", and the pitch is 6 slots; at the same time, it represents that the first winding branch of the U phase is wired in from the L1 slot layer of the conductor slot 510 with the serial number "1#", referring to FIG. Figure 3U1 in the figure. The subsequent winding lines are similar, and the hairpin coil 100 corresponding to the line "2#L5-8#L5" is a reverse twisted coil 100b, and its two effective sides 110 are respectively arranged in the L5 slot layer of the conductor slot 510 numbered "2#" and the L5 slot layer of the conductor slot 510 numbered "8#", with a pitch of 6 slots. The line "13#L2-7#L1" corresponds to the last hairpin coil 100 of the first winding branch, which is a stacked coil 100a, and its two effective sides 110 are respectively wound in the L2 slot layer of the conductor slot 510 numbered "13#" and the L1 slot layer of the conductor slot 510 numbered "7#", with a pitch of 6 slots; at the same time, it represents that the first winding branch of the U phase is connected with the L1 slot layer of the conductor slot 510 numbered "7", refer to Figure 3 It is not difficult to see that the first winding branch of phase U does not include the bridge line 200.

[0077] The second, third and fourth winding branches of the U phase are the same. Among them, "13#L1-19#L2" is the first hairpin coil 100 of the second winding branch, which is in the shape of a lapped coil 100a, which represents that the second winding branch of the U phase enters the L1 slot layer of the conductor slot 510 with the serial number "13#", referring to Figure 3 The line corresponding to "25#L2-19#L1" is the last hairpin coil 100 of the second winding branch, which is in the shape of a lapped coil 100a, which represents that the second winding branch of the U phase is connected to the L1 slot layer of the conductor slot 510 with the serial number "19#", referring to Figure 3 X2 in.

[0078] Among them, "25#L1-31#L2" is the first hairpin coil 100 of the third winding branch, which is in the shape of a stacked coil 100a, which represents that the third winding branch of the U phase is connected to the L1 slot layer of the conductor slot 510 with the serial number "25#", referring to Figure 3 The line corresponding to "37#L2-31#L1" is the last hairpin coil 100 of the third winding branch, which is in the shape of a lapped coil 100a, which represents that the third winding branch of the U phase is connected to the L1 slot layer of the conductor slot 510 with the serial number "31#", referring to Figure 3 X3 in.

[0079] Among them, "37#L1-43#L2" is the first hairpin coil 100 of the fourth winding branch, which is in the shape of a stacked coil 100a, which represents that the fourth winding branch of the U phase is connected to the L1 slot layer of the conductor slot 510 with the serial number "37#", referring to Figure 3The line corresponding to "1#L2-43#L1" is the last hairpin coil 100 of the fourth winding branch, which is in the shape of a lapped coil 100a, which represents that the fourth winding branch of the U phase is connected to the L1 slot layer of the conductor slot 510 with the serial number "43#", referring to Figure 3 X4 in.

[0080] It is not difficult to see that the line entry position and the line exit position of the first winding branch of the U phase are respectively the L1 slot layer of the conductor slot 510 numbered “1#” and the L1 slot layer of the conductor slot 510 numbered “7#”, the line entry position and the line exit position of the second winding branch of the U phase are respectively the L1 slot layer of the conductor slot 510 numbered “13#” and the L1 slot layer of the conductor slot 510 numbered “19#”, and the line entry position and the line exit position of the third winding branch of the U phase are respectively They are respectively the L1 slot layer of the conductor slot 510 numbered “25#” and the L1 slot layer of the conductor slot 510 numbered “31#”; the line-in position and line-out position of the fourth winding branch of the U phase are respectively the L1 slot layer of the conductor slot 510 numbered “37#” and the L1 slot layer of the conductor slot 510 numbered “43#”; that is, any winding branch of the U phase has its line inlet through the L1 slot layer of the conductor slot 510 and its line outlet through the L1 slot layer of the conductor slot 510.

[0081] like Figure 2 As shown, the winding lines of the V phase and the W phase can be obtained by translating the winding line of the U phase by 4 and 8 conductor slots 510 in the direction of increasing conductor slot numbers. Based on this, the entry positions of the four winding branches of the V phase are 5#L1, 17#L1, 29#L1 and 41#L1 respectively. Figure 2 V1, V2, V3 and V4 in the figure; the outlet positions of the four winding branches of phase V are 11#L1, 23#L1, 35#L1 and 47#L1 respectively. Figure 2 Y1, Y2, Y3 and Y4 in the figure. The four winding branches of phase W are located at 9#L1, 21#L1, 33#L1 and 45#L1 respectively. Figure 2 W1, W2, W3 and W4 in the figure; the outlet positions of the four winding branches of phase W are 15#L1, 27#L1, 39#L1 and 3#L1 respectively. Figure 2 Z1, Z2, Z3 and Z4 in .

[0082] like Figure 2As shown, in this embodiment, the odd-even layer stator winding may also include a phase copper bar 300 and a star point copper bar 400, wherein the phase copper bar 300 corresponds to the three phases of the stator assembly one by one, that is, the phase copper bar 300 is set to three. Any phase copper bar 300 is connected to the incoming line positions of the n winding branches of the corresponding phase. For example, in the aforementioned embodiment, the phase copper bar 300 corresponding to U is connected to the aforementioned U1, U2, U3 and U4. The star point copper bar 400 may correspond to the number of parallel winding branches of any phase, that is, it is set to n. Any star point copper bar 400 is connected to the outgoing line positions of the corresponding winding branches of the three phases. For example, in the aforementioned embodiment, the star point copper bar 400 corresponding to the first winding branch is connected to U1, V1 and W1.

[0083] Of course, in some embodiments, the star point copper bus 400 may be set to only one, which is connected to the outgoing line positions of a total of 3n winding branches of three phases. For example, in the aforementioned embodiment, the star point copper bus 400 connects X1, X2, X3, X4, Y1, Y2, Y3, Y4, Z1, Z2, Z3 and Z4.

[0084] Specifically, when n=2, the first winding branch of phase U is:

[0085] 1#L1-7#L2-2#L1-8#L2-1#L3-7#L4-2#L3-8#L4-1#L5-7#L6-2#L5-8#L5-1 3#L6-7#L5-14#L4-8#L3-13#L4-7#L3-14#L2-8#L1-13#L2-7#L1-13#L1-19 #L2-14#L1-20#L2-13#L3-19#L4-14#L3-20#L4-13#L5-19#L6-14#L5-20#L 5-25#L6-19#L5-26#L4-20#L3-25#L4-19#L3-26#L2-20#L1-25#L2-19#L1;

[0086] The second winding branch of phase U is:

[0087] 25#L1-31#L2-26#L1-32#L2-25#L3-31#L4-26#L3-32#L4-25#L5-31#L6-26#L 5-32#L5-37#L6-31#L5-38#L4-32#L3-37#L4-31#L3-38#L2-32#L1-37#L2-31# L1-37#L1-43#L2-38#L1-44#L2-37#L3-43#L4-38#L3-44#L4-37#L5-43#L6-38 #L5-44#L5-1#L6-43#L5-2#L4-44#L3-1#L4-43#L3-2#L2-44#L1-1#L2-43#L1.

[0088] like Figure 6 As shown, in this embodiment, it is exemplarily explained, and it is not difficult to see that Figure 6 The stator winding of the two parallel branches in the Figure 3 The stator winding of the four parallel branches in the deformation is obtained, which can be specifically Figure 3 The X1 and U1 in the stator winding of the four parallel branches are connected through a bridge line 200, and Figure 3 The stator windings X3 and U4 of the four parallel branches in the embodiment are connected by a bridge line 200 so that Figure 3 The first winding branch and the second winding branch of the stator winding of the four parallel branches are connected in series to form Figure 6 The first winding branch of the stator winding of the parallel two branches in Figure 3 The third winding branch and the fourth winding branch of the stator winding of the four parallel branches are connected in series to form Figure 6 The second winding branch of the stator winding of the parallel two branches in the embodiment of the present invention. In the two stator windings, the line type of the hairpin coil 100 can be exactly the same.

[0089] like Figure 6 As shown, in this embodiment, the first winding branch of the U phase is taken as an example. The line corresponding to "1#L1-7#L2" is the first hairpin coil 100, which is a lapped coil 100a, and its two effective sides 110 are respectively wound on the L1 slot layer of the conductor slot 510 with the serial number "1#" and the L2 slot layer of the conductor slot 510 with the serial number "7#", and the pitch is 6 slots; at the same time, it represents that the first winding branch of the U phase is wired in the L1 slot layer of the conductor slot 510 with the serial number "1#", refer to 6 Figure 6U1′ in the figure. The subsequent winding lines are similar, where the line corresponding to "7#L1-13#L1" is a bridge line 200, which connects the two stacked coils 100a represented by the lines corresponding to "13#L2-7#L1" and "13#L1-19#L2". The line corresponding to "25#L2-19#L1" is the last hairpin coil 100, which is also a stacked coil 100a. Its two effective sides 110 are respectively wound on the L2 slot layer of the conductor slot 510 numbered "25#" and the L1 slot layer of the conductor slot 510 numbered "19#", with a pitch of 6 slots; at the same time, it represents that the first winding branch of the U phase is connected to the L1 slot layer of the conductor slot 510 numbered "19#", refer to Figure 6 X1′ in .

[0090] The same is true for the second winding branch of the U phase. The line corresponding to "25#L1-31#L2" is the first lapped coil 100a of the second winding branch, and its pitch is 6 slots; at the same time, it represents that the second winding branch of the U phase enters the L1 slot layer of the conductor slot 510510 with the serial number "25#", referring to Figure 6 U2′ in the figure. The line corresponding to “1#L2-43#L1” is the last lapped coil 100a of the second winding branch, and its pitch is 6 slots; at the same time, it represents that the second winding branch of the U phase is connected to the L1 slot layer of the conductor slot 510 with the serial number “43#”, referring to Figure 6 X2′ in .

[0091] The winding circuits of phase V and phase W can be obtained in the same way and will not be elaborated here.

[0092] Of course, in other embodiments, Z, p and m may also be other parameters. For example, Z=72, p=6, m=4. In this embodiment, the cross-layer mode of the plurality of hairpin coils 100 includes: a stacked coil 100a having two effective sides 110 spanning the L1 slot layer and the L2 slot layer and two effective sides 110 spanning the L3 slot layer and the L4 slot layer, and a reverse twisted coil 100b having two effective sides 110 spanning the L5 slot layer and the L5 slot layer. Another example is Z=96, p=8, m=8. In this embodiment, the cross-layer manner of several hairpin coils 100 includes: a stacked coil 100a with two effective edges 110 spanning the L1 slot layer and the L2 slot layer, two effective edges 110 spanning the L3 slot layer and the L4 slot layer, two effective edges 110 spanning the L5 slot layer and the L6 slot layer, and two effective edges 110 spanning the L7 slot layer and the L8 slot layer, and a reverse twisted coil 100b with two effective edges 110 spanning the L7 slot layer and the L7 slot layer.

[0093] The implementation principle of a mixed slot layer stator winding provided in the first embodiment of the present application is:

[0094] The punching sheets are stacked into an iron core 500, and then a plurality of hairpin coils 100 are wound on the iron core 500 to obtain 3n winding branches. Among them, the plurality of hairpin coils 100 are provided with m / 2+1 cross-layer modes: two effective sides 110 span L1 slot layer and L2 slot layer, two effective sides 110 span L3 slot layer and L4 slot layer... two effective sides 110 span Lm-1 slot layer and Lm slot layer, and two effective sides 110 span Lm-1 slot layer and Lm-1 slot layer. The reverse twisted coil 100b. Subsequently, the phase copper bar 300 and the star point copper bar 400 are connected at the designated positions of the 3n winding branches.

[0095] The present application can prepare the required odd-even layer stator winding by setting the several conductor slots 510 of the core piece 500 to a mixed slot type of m-1 slot layers and m slot layers, and reasonably setting the combination form and number of the several conductor slots 510, and by reasonably setting the cross-layer mode of the several hairpin coils 100 of the stator winding. It has been verified that compared with the stator winding with the same slot type of the several conductor slots 510 of the core piece 500 and an even-numbered layer design, the odd-even layer stator winding provided by the present application can effectively reduce the required electric density / wire load of the stator assembly, so as to reduce copper loss, thereby reducing the temperature of the stator assembly and avoiding adverse effects on the heat dissipation of the motor.

[0096] Embodiment 2

[0097] Embodiment 2 of the present application provides a stator assembly, and the stator assembly includes any one of the mixed slot layer stator windings provided in the present application.

[0098] Embodiment 3

[0099] Embodiment 3 of the present application provides a motor, and the motor includes any stator assembly provided in the present application.

[0100] Comparative Example

[0101] The comparative example of the present application provides a stator winding with 54 slots, 6 poles, 6 layers and 2 branches in parallel, with exactly the same slot type of conductor slots 510 to 510, which is used for comparison with the stator winding with 54 slots, 6 poles, odd-even mixed layers and 2 branches in parallel in Example 1 of the present application.

[0102] Application Example 1

[0103] The present application embodiment 1 compares the stator transient temperature curves of the motors to which the two stator windings provided in the embodiment 1 and the comparative example are applicable, and obtains the following under the premise that the motor size / material usage and other parameters are the same: Figure 8As shown in the comparison chart, the blue line represents the data of the motor that the stator winding provided in Example 1 is suitable for, and the red line represents the data of the motor that the stator winding provided in the comparative example is suitable for. It is not difficult to see that when the embodiment 1 of the present application outputs the same peak power, the required electric density / line load is lower, and the copper loss and heat generation are lower. In detail, the peak temperature of the stator winding is relatively reduced by 26°C.

[0104] Application Example 2

[0105] The present application uses Example 2 to compare the output performance of the motors to which the two stator windings provided in Example 1 and the comparative example are applicable. Under the premise that other parameters such as motor size / material usage are the same, the following is obtained: Fig. 9 The comparison diagram shown in the figure shows that the solid line shows the data of the motor that the stator winding provided in the first embodiment is applicable to, and the dotted line shows the data of the motor that the stator winding provided in the comparative example is applicable to. It is not difficult to see that the first embodiment of the present application can increase the peak power of the motor by 9.2%; at the same time, the proportion of the motor's high-efficiency range area is increased by 2.3%-5.6%, and the maximum efficiency is increased by 0.3%.

[0106] Application Example 3

[0107] The present application applies Example 3 to obtain the reverse potential spectrum of the motors to which the two stator windings provided in Example 1 and the comparative example are applicable. Under the premise that other parameters such as motor size / material usage are the same, the following can be obtained: Fig.10 and Fig.11 The bar chart shown in Fig.10 Indicates the data of the motor that the stator winding provided by the comparison ratio is suitable for, Fig.11 The data of the motor to which the stator winding provided in the first embodiment is applicable are shown. Fig.10 and Fig.11 In the figure, the horizontal axis represents the harmonic order, and the vertical axis represents the voltage, with the unit being V. It is not difficult to see that the first embodiment of the present application can reduce the proportion of 3rd / 5th / 7th harmonics, thereby improving the motor performance.

[0108] Application Example 4

[0109] The present application uses the fourth embodiment to compare the back electromotive force of the motors to which the two stator windings provided in the first embodiment and the comparative example are applicable, and the following is obtained under the premise that other parameters such as motor size / material usage are the same: Fig.12 As shown in the comparison diagram, the red line represents the data of the motor to which the stator winding provided in the first embodiment is applicable, and the blue line represents the data of the motor to which the stator winding provided in the comparative example is applicable. It is not difficult to see that the first embodiment of the present application can optimize the inductance of the motor, thereby improving the sinusoidality of the back-EMF waveform.

[0110] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0111] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A stator winding with mixed slot layers, characterized in that: The mixed slot layer number stator winding is used for a stator component, the number of poles of the stator component is 2p, the stator component further comprises an iron core (500), the iron core (500) is provided with Z conductor slots (510) at equal intervals along the circumferential direction, wherein Z=12p; among the Z conductor slots (510), every two conductor slots (510) form a group, and in the same group of conductor slots (510), a conductor slot (510) located on the left is provided with L1, L2...Lm-1 slot layers in sequence, and a conductor slot (510) located on the right is provided with L1, L2...Lm slot layers in sequence, wherein m is an even number not less than 4; the mixed slot layer number stator winding comprises winding circuits of three phases in total, namely, U, V and W, and the winding circuits of the V phase and the W phase are sequentially shifted by Z / 3p and 2Z / 3p conductor slots ( 510), the winding circuit of each phase is completely wound in two conductor slots (510) constituting the same group, and four conductor slots (510) are evenly spaced; the winding circuit of each phase includes n parallel winding branches, each winding branch includes a plurality of hairpin coils (100), the hairpin coils (100) include two effective edges (110) arranged at intervals, and the effective edges (110) are arranged in one of the slot layers of the conductor slots (510); wherein the hairpin coils (100) are arranged with m / 2+1 kinds of cross-layer modes: two effective edges (110) span L1 slot layer and L2 slot layer, two effective edges (110) span L3 slot layer and L4 slot layer... two effective edges (110) span Lm-1 slot layer and Lm slot layer, and two effective edges (110) span Lm-1 slot layer and Lm-1 slot layer.

2. The mixed slot layer stator winding according to claim 1, characterized in that: The hairpin coil (100) further comprises a welding end (120) and a hairpin end (130), wherein two welding ends (120) are provided, and the two welding ends (120) are provided at the same end of the two effective edges (110), and the hairpin end (130) is connected to the other ends of the two effective edges (110), and the hairpin coil (100) is provided with two types: a lapped coil (100a) and a reverse twisted coil (100b), and the two welding ends (120) of the lapped coil (100a) extend in a direction close to each other, and the reverse twisted coil (100b) is provided with two types. The two welding ends (120) of the twisted coil (100b) extend in the same direction, and the cross-layer mode is that the two effective edges (110) cross the L1 slot layer and the L2 slot layer, the two effective edges (110) cross the L3 slot layer and the L4 slot layer... the hairpin coil (100) with two effective edges (110) crossing the Lm-1 slot layer and the Lm slot layer is the stacked coil (100a), and the cross-layer mode is that the hairpin coil (100) with two effective edges (110) crossing the Lm-1 slot layer and the Lm-1 slot layer is the reverse twisted coil (100b).

3. The mixed slot layer stator winding according to claim 2, characterized in that: Each winding branch further comprises a bridge wire (200), wherein the bridge wire (200) connects two of the hairpin coils (100), and the two hairpin coils (100) connected by the bridge wire (200) are both the stacked coils (100a).

4. The mixed slot layer stator winding according to claim 2 or 3, characterized in that: The hairpin coils (100) of the same cross-layer manner all have the same pitch.

5. The mixed slot layer stator winding according to claim 4, characterized in that: Z=48, p=4, m=6, n=2 or 4, and the cross-layer mode is that two of the effective edges (110) cross the L1 slot layer and the L2 slot layer, two of the effective edges (110) cross the L3 slot layer and the L4 slot layer, two of the effective edges (110) cross the L5 slot layer and the L6 slot layer, and two of the effective edges (110) cross the L5 slot layer and the L5 slot layer, and the pitch of the hairpin coil (100) is 6 slots.

6. The mixed slot layer stator winding according to claim 5, characterized in that: Any winding branch has an input line from the L1 slot layer of the conductor slot (510), and has an output line from the L1 slot layer of the conductor slot (510).

7. The mixed slot layer stator winding according to claim 6, characterized in that: When n=4, the first winding branch of the U phase is: 1#L1-7#L2-2#L1-8#L2-1#L3-7#L4-2#L3-8#L4-1#L5-7#L6-2#L5-8#L5-13#L6-7#L5-14#L4-8#L3-13#L4-7#L3-14#L2-8#L1-13#L2-7#L1; The second winding branch of the U phase is: 13#L1-19#L2-14#L1-20#L2-13#L3-19#L4-14#L3-20#L4-13#L5-19#L6-14#L5- 20#L5-25#L6-19#L5-26#L4-20#L3-25#L4-19#L3-26#L2-20#L1-25#L2-19#L1; The third winding branch of the U phase is: 25#L1-31#L2-26#L1-32#L2-25#L3-31#L4-26#L3-32#L4-25#L5-31#L6-26#L5- 32#L5-37#L6-31#L5-38#L4-32#L3-37#L4-31#L3-38#L2-32#L1-37#L2-31#L1; The fourth winding branch of the U phase is: 37#L1-43#L2-38#L1-44#L2-37#L3-43#L4-38#L3-44#L4-37#L5-43#L6-38# L5-44#L5-1#L6-43#L5-2#L4-44#L3-1#L4-43#L3-2#L2-44#L1-1#L2-43#L1.

8. The mixed slot layer stator winding according to claim 6, characterized in that: When n=2, the first winding branch of the U phase is: 1#L1-7#L2-2#L1-8#L2-1#L3-7#L4-2#L3-8#L4-1#L5-7#L6-2#L5-8#L5-1 3#L6-7#L5-14#L4-8#L3-13#L4-7#L3-14#L2-8#L1-13#L2-7#L1-13#L1-19 #L2-14#L1-20#L2-13#L3-19#L4-14#L3-20#L4-13#L5-19#L6-14#L5-20#L 5-25#L6-19#L5-26#L4-20#L3-25#L4-19#L3-26#L2-20#L1-25#L2-19#L1; The second winding branch of the U phase is: 25#L1-31#L2-26#L1-32#L2-25#L3-31#L4-26#L3-32#L4-25#L5-31#L6-26#L 5-32#L5-37#L6-31#L5-38#L4-32#L3-37#L4-31#L3-38#L2-32#L1-37#L2-31# L1-37#L1-43#L2-38#L1-44#L2-37#L3-43#L4-38#L3-44#L4-37#L5-43#L6-38 #L5-44#L5-1#L6-43#L5-2#L4-44#L3-1#L4-43#L3-2#L2-44#L1-1#L2-43#L1.

9. A stator assembly, characterized in that: The stator assembly includes a stator winding with mixed slot layers as described in any one of claims 1-8.

10. A motor, characterized in that: The electric machine comprises the stator assembly of claim 9.

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