Odd-even mixed layer winding structure, stator assembly and motor equipment

Abstract

The invention relates to an odd-even mixed layer winding structure, a stator assembly and motor equipment, the number of poles of the stator assembly is 2p, a stator core is provided with Z stator slots, and Z is equal to 12p; every two stator slots form a group, in the same group of stator slots, the stator slot at the left side position is sequentially provided with first, second,... and m slot layers, and the stator slot at the right side position is sequentially provided with first, second,... and (m + 1) slot layers; each winding branch comprises a plurality of hairpin coils; the hairpin coil is provided with m / 2 + 1 layer crossing modes: crossing the first slot layer and the second slot layer, crossing the third slot layer and the fourth slot layer,... crossing the (m-1) th slot layer and the mth slot layer, and crossing the (m + 1) th slot layer and the (m + 1) th slot layer. According to the invention, the motor equipment can be effectively prevented from generating large stator-side magnetomotive force harmonic waves in the working process, so that the counter electromotive force harmonic wave proportion is reduced, and the performance of the motor equipment is prevented from being affected.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to an odd-even mixed layer winding structure, a stator assembly and a motor device. Background Art

[0002] The motor device can be used in the power system of new energy vehicles, which usually includes a stator assembly fixed in the motor housing, and the stator assembly can include a stator core formed by stacking a number of punching sheets and a winding structure wound on the stator core. The winding structure is usually wound by a number of hairpin coils, and the hairpin coils are at least partially wound in the stator slots on the stator core. The stator slots can be provided with different slot layers according to their radial positions, and each slot layer is used to arrange the effective side of a hairpin coil. In the prior art, the winding structure is mostly an even-numbered layer structure, such as 6 layers, 8 layers and 10 layers; at the same time, several stator slots on the stator core all adopt the same slot type to arrange the same number of layers of effective sides. However, in the aforementioned existing winding structure, the motor equipment to which it is applicable often generates large stator-side magnetomotive force harmonics, especially high-order harmonics, during operation, thereby affecting the performance of the motor equipment. Summary of the invention

[0003] Based on this, the present application provides an odd-even mixed layer winding structure, a stator assembly and a motor device to improve the problem that the motor device to which the winding structure in the prior art is applicable generates large stator side magnetomotive force harmonics during operation.

[0004] In a first aspect, the present application provides an odd-even mixed layer winding structure, which is used for a stator assembly, the number of poles of the stator assembly is 2p, and the stator assembly also includes a stator core, and the stator core is provided with Z stator slots at equal intervals along the circumferential direction, wherein Z=12p; among the Z stator slots, every 2 stator slots form a group, and in the same group of stator slots, a stator slot located at a left position is provided with 1st, 2nd...m slot layers in sequence, and a stator slot located at a right position is provided with 1st, 2nd...(m+1) slot layers in sequence, wherein m is an even number not less than 4; the odd-even mixed layer winding structure includes 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 composed of a winding branch of the U phase. By sequentially translating Z / 3p and 2Z / 3p of the stator slots, the winding circuit of each phase is completely wound in two of the stator slots constituting the same group, and four of the stator slots are evenly spaced apart; the winding circuit of each phase includes n parallel winding branches, each winding branch includes a plurality of hairpin coils, the hairpin coils include two effective edges arranged at intervals, and the effective edges are arranged in one of the slot layers of the stator slots; wherein the hairpin coils are arranged in m / 2+1 cross-layer modes: two of the effective edges span the first slot layer and the second slot layer, two of the effective edges span the third slot layer and the fourth slot layer...two of the effective edges span the (m-1)th slot layer and the mth slot layer, and two of the effective edges span the (m+1)th slot layer and the (m+1)th slot layer.

[0005] In one embodiment, the hairpin coil further 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 edges, and the hairpin end is connected to the other ends of the two effective edges. The hairpin coil is provided with two types: a stacked coil and a reverse twisted coil, and 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, and the cross-layer method is that the two effective edges span the 1st slot layer and the 2nd slot layer, the two effective edges span the 3rd slot layer and the 4th slot layer... The hairpin coils of the two effective edges spanning the (m-1)th slot layer and the mth slot layer are both the stacked coils, and the cross-layer method is that the two effective edges spanning the (m+1)th slot layer and the (m+1)th slot layer 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 manner is that the pitch of the hairpin coils of two effective sides spanning the 1st slot layer and the 2nd slot layer, two effective sides spanning the 3rd slot layer and the 4th slot layer, two effective sides spanning the 5th slot layer and the 6th slot layer, and two effective sides spanning the 7th slot layer and the 7th slot layer are all 6 slots.

[0009] In one of the embodiments, any winding branch has wire input from the first slot layer of the stator slot and wire output from the first slot layer of the stator slot.

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

[0011] 1.1-7.2-2.1-8.2-1.3-7.4-2.3-8.4-1.5-7.6-2.5-8.6-1.7-7.7-14.6-8.5-13.6-7.5-14.4-8.3-13.4-7.3-14.2-8.1-13.2-7.1;

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

[0013] 13.1-19.2-14.1-20.2-13.3-19.4-14.3-20.4-13.5-19.6-14.5-20.6-13.7-19.7-26.6-20.5-25.6-19.5-26.4-20.3-25.4-19.3-26.2-20.1-25.2-19.1;

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

[0015] 25.1-31.2-26.1-32.2-25.3-31.4-26.3-32.24-25.5-31.6-26.5-32.6-25.7-31.7-38.6-32.5-37.6-31.5-38.4-32.3-37.4-31.3-38.2-32.1-37.2-31.1;

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

[0017] 37.1-43.2-38.1-44.2-37.3-43.4-38.3-44.4-37.5-43.6-38.5-44.6-37.7-43.7-2.6-44.5-1.6-43.5-2.4-44.3-1.4-43.3-2.2-44.1-1.2-43.1.

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

[0019] 1.1-7.2-2.1-8.2-1.3-7.4-2.3-8.4-1.5-7.6-2.5-8.6-1.7-7.7-14.6 -8.5-13.6-7.5-14.4-8.3-13.4-7.3-14.2-8.1-13.2-7.1-13.1-19.2-14.1

[0020] -20.2-13.3-19.4-14.3-20.4-13.5-19.6-14.5-20.6-13.7-19.7-26.6-20.5-25.6-19.5-26.4-20.3-25.4-19.3-26.2-20.1-25.2-19.1;

[0021] The second winding branch of the U phase is:

[0022] 25.1-31.2-26.1-32.2-25.3-31.4-26.3-32.24-25.5-31.6-26.5-32.6-25.7-31.7-38.6-32.5-37.6-31.5-38.4-32.3-37.4-31.3-38.2-32.1-37.2-3 1.1-37.1-43.2-38.1-44.2-37.3-43.4-38.3-44.4-37.5-43.6-38.5-44.6-37.7-43.7-2.6-44.5-1.6-43.5-2.4-44.3-1.4-43.3-2.2-44.1-1.2-43.1.

[0023] In a second aspect, the present application provides a stator assembly, which includes any one of the odd-even mixed layer winding structures provided in the present application.

[0024] In a third aspect, the present application provides a motor device, which includes any one of the stator assemblies provided in the present application.

[0025] The present application can prepare the required odd-even mixed layer winding structure by setting several stator slots of the stator core to a mixed slot type of m slot layers and m+1 slot layers, and reasonably setting the combination form and number of several stator slots, and at the same time by reasonably setting the cross-layer method of several hairpin coils of the winding structure. It has been verified that compared with the winding structure in which the slot types of several stator slots of the matching stator core are exactly the same and an even-numbered layer design is adopted, the odd-even mixed layer winding structure provided by the present application can effectively avoid the generation of large stator-side magnetomotive force harmonics by the motor equipment during operation, so as to reduce the proportion of back-electromotive force harmonics, especially the proportion of high-order harmonics, thereby avoiding the performance of the motor equipment from being affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of an odd-even mixed layer winding structure provided in an embodiment of the present application when it is wound on a stator core;

[0027] Figure 2 A schematic diagram of winding when an odd-even mixed layer winding structure provided in an embodiment of the present application is 48 slots, 8 poles, 6 layers and 4 branches in parallel;

[0028] Figure 3 A schematic diagram of winding of the U phase when the odd-even mixed layer winding structure provided in one embodiment of the present application is 48 slots, 8 poles, 6 layers and 4 branches in parallel;

[0029] Figure 4 A schematic structural diagram of a stacked coil with an odd-even mixed layer winding structure provided in the first embodiment of the present application;

[0030] Figure 5 A schematic diagram of the structure of a reverse twisted coil of an odd-even mixed layer winding structure provided in the first embodiment of the present application;

[0031] Figure 6 A schematic diagram of winding of the U phase when the odd-even mixed layer winding structure provided in one embodiment of the present application is 48 slots, 8 poles, 6 layers and 2 branches in parallel;

[0032] Figure 7 A schematic diagram of the structure of a bridge wire of an odd-even mixed layer winding structure provided in the first embodiment of the present application;

[0033] Figure 8 The reverse potential spectrum diagram of the comparative example provided for the application of Example 2 of the present application;

[0034] Fig. 9 The reverse potential spectrum diagram of Example 1 provided for the application of Example 2 of this application;

[0035] Fig.10 A comparison diagram of the back electromotive force of Example 1 and the comparative example provided for the application of Example 3 of the present application;

[0036] Fig.11 This is a comparison chart of output performance of Example 1 and a comparative example provided for application Example 1 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 wire; 210, bridge connecting wire; 220, bridge welding end; 300, phase copper busbar; 400, star point copper busbar; 500, stator core; 510, stator 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 an odd-even mixed layer winding structure, such as Figures 1 to 7As shown, the odd-even mixed layer winding structure is used for the stator assembly, the number of poles of the stator assembly is 2p, and the stator assembly also includes a stator core 500, and the stator core 500 is provided with Z stator slots 510 at equal intervals along the circumferential direction, where Z=12p; among the Z stator slots 510, every two stator slots 510 form a group, and in the same group of stator slots 510, a stator slot 510 located at the left position is sequentially provided with the 1st, 2nd...m slot layers, and a stator slot 510 located at the right position is sequentially provided with the 1st, 2nd...(m+1) slot layers, where m is an even number not less than 4; the odd-even mixed layer winding structure includes winding circuits of three phases, namely U, V and W, and the winding circuits of the V phase and the W phase are sequentially translated from the winding branch of the U phase by Z / 3p and 2Z / 3p stator slots 5 10, the winding circuit of each phase is completely wound in two stator slots 510 constituting the same group, and is evenly spaced by four stator slots 510; 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 stator slot 510; wherein the hairpin coil 100 is arranged with m / 2+1 kinds of cross-layer modes: two effective edges 110 span the first slot layer and the second slot layer, two effective edges 110 span the third slot layer and the fourth slot layer... two effective edges 110 span the (m-1)th slot layer and the mth slot layer, and two effective edges 110 span the (m+1)th slot layer and the (m+1)th slot layer.

[0044] like Figure 1As shown, in this embodiment, it is exemplarily explained that the number of poles of the stator assembly is 2p, that is, the stator assembly includes p pairs of magnetic poles with opposite magnetic properties, in other words, the number of pole pairs is p. The stator assembly can be mainly composed of a stator core 500 and a winding structure, wherein the stator core 500 can be set as a hollow cylindrical structure, which can be specifically prepared by a plurality of punching sheets using a stacking preparation process. The stator slot 510 can be arranged on the inner side of the stator core 500, and the stator slot 510 can be arranged with Z equal intervals along the circumference of the stator core 500, where Z=12p. The stator slot 510 can be set in the form of an open slot, and its slot opening can face the axis of the stator core 500. The stator slot 510 is used to arrange the hairpin coil 100. According to the position of the hairpin coil 100 in the stator slot 510, the stator slot 510 can be set to m or m+1 slot layers along the radial direction of the stator core 500, where m is an even number not less than 4; that is, the stator slot 510 in this embodiment is provided with two numbers of slot layers. From the inside to the outside along the radial direction of the stator core 500, the first slot layer, the second slot layer...the mth or m+1th slot layer of the stator slot 510 can be arranged in sequence. In the aforementioned Z stator slots 510, every two stator slots 510 form a group, that is, Z / 2 groups of stator slots 510 are provided in this embodiment. In the same group of stator slots 510, the number of slot layers of a stator slot 510 located on the left is m, and the number of slot layers of a stator slot 510 located on the right is m+1. The aforementioned left position and right position may be relative positions of two stator slots 510 of the same group when observing from an angle of looking down at the end of the stator core 500 . In some embodiments, the left position and the right position may be adaptively interchanged.

[0045] like Figure 1 and Figure 2 As shown, the number of phases of the stator assembly can be three phases, and the three phases can be U phase, V phase and W phase respectively, wherein 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 them 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, it is suitable for a three-phase motor. At the same time, the winding structure of the stator assembly includes winding circuits of three phases, and the winding circuits of the three phases are electrically connected to form a three-phase circuit. For any phase of the winding structure, its winding circuit is completely wound in two consecutive stator slots 510, and the two stator slots 510 constitute the same group. At the same time, the winding circuit of any phase is also evenly spaced by four stator slots 510. Under this structure, when the winding circuits of the V phase and the W phase are respectively shifted by Z / 3p=4 and 2Z / 3p=8 stator slots 510 from the winding circuit of the U phase, the winding circuits of the U phase, the V phase and the W phase can be arranged in a staggered manner and just fill the Z stator slots 510.

[0046] like Figure 3 As shown, in this embodiment, the winding circuit of any phase also includes n winding branches, and the n winding branches are connected in parallel, where n is a positive integer not less than 2. According to actual needs, n can be set to different values ​​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 at least partially wound in the stator slot 510, and the portion arranged in the stator slot 510 is called an effective edge 110. The plurality of hairpin coils 100 in this embodiment include two effective edges 110, which are arranged at intervals and are respectively arranged in a slot layer of a stator slot 510; at this time, the shape of the hairpin coil 100 can be called a "U"-shaped line because it is similar to a "U" shape.

[0047] In this embodiment, several hairpin coils 100 are cross-layered in a specified form, which specifically includes m / 2+1 cross-layer methods, wherein the first method is that the two effective sides 110 of the hairpin coil 100 cross the 1st slot layer and the 2nd slot layer, the second method is that the two effective sides 110 of the hairpin coil 100 cross the 3rd slot layer and the 4th slot layer... The m / 2 method is that the two effective sides 110 of the hairpin coil 100 cross the (m-1)th slot layer and the mth slot layer, and the m / 2+1 method is that the two effective sides 110 of the hairpin coil 100 cross the (m+1)th slot layer and the (m+1)th slot layer. For example, when m=6, there are four ways of crossing layers for several hairpin coils 100: two effective edges 110 cross the 1st slot layer and the 2nd slot layer, two effective edges 110 cross the 3rd slot layer and the 4th slot layer, two effective edges 110 cross the 5th slot layer and the 6th slot layer, and two effective edges 110 cross the 7th slot layer and the 7th slot layer.

[0048] It is not difficult to understand that the present application can prepare the required odd-even mixed layer winding structure by setting the several stator slots 510 of the stator core 500 to a mixed slot type of m slot layers and m+1 slot layers, and reasonably setting the combination form and quantity of the several stator slots 510, and at the same time by reasonably setting the cross-layer mode of the several hairpin coils 100 of the winding structure. It has been verified that compared with the winding structure in which the slot type of the several stator slots 510 of the stator core 500 matched therewith is exactly the same and an even-numbered layer design is adopted, the odd-even mixed layer winding structure provided by the present application can effectively avoid the generation of large stator-side magnetomotive force harmonics in the working process of the suitable motor equipment, so as to reduce the proportion of back-electromotive force harmonics, especially the proportion of high-order harmonics, thereby avoiding the performance of the motor equipment from being affected.

[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 1st slot layer and the 2nd slot layer, the two effective edges 110 span the 3rd slot layer and the 4th slot layer... The hairpin coil 100 whose two effective edges 110 span the (m-1)th slot layer and the mth slot layer are both stacked coils 100a, and the hairpin coil 100 whose two effective edges 110 span the (m+1)th slot layer and the (m+1)th slot layer are both reverse twisted coils 100b.

[0050] like Figure 4 and Figure 5 As shown, in this embodiment, the hairpin coil 100 can be prepared in an integrated manner, for example, the hairpin coil 100 is made of flat enameled wire, and in addition to the two effective sides 110, it can also include a welding end 120 and a hairpin end 130, wherein two welding ends 120 are provided, and the two welding ends 120 correspond to the two effective sides 110 one by one, and are provided at the same end of the two effective sides 110. There is only one hairpin end 130, which is connected between the other ends of the two effective sides 110.

[0051] According to the shape of the hairpin coil 100, the hairpin coil 100 can be divided into two types: a stacked coil 100a and a reverse twisted coil 100b. The two welding ends 120 of the stacked coil 100a are inclined and extended in a direction close to each other to form a closed structure, while the two welding ends 120 of the reverse twisted coil 100b are inclined and extended in the same direction. The hairpin ends 130 of the stacked coil 100a and the reverse twisted coil 100b can be similar in shape, and can be both set to a shape similar to a "V" shape. When the two stacked coils 100a in this embodiment are connected, the two stacked coils 100a are connected through one of their welding ends 120, and the two welding ends 120 are usually fixed by welding. The reverse twisted coil 100b connects the two stacked coils 100a; when connected, the two welding ends 120 of the reverse twisted coil 100b are respectively connected to one welding end 120 of the two stacked coils 100a, and they are also fixed by welding.

[0052] like Figure 2 and Figure 3As shown, in this embodiment, the two effective sides 110 span the 1st slot layer and the 2nd slot layer, the two effective sides 110 span the 3rd slot layer and the 4th slot layer...the two effective sides 110 of the hairpin coil 100 spanning the (m-1)th slot layer and the mth slot layer are both set to the shape of the stacked coil 100a, and the two effective sides 110 of the hairpin coil 100 spanning the (m+1)th slot layer and the (m+1)th slot layer are both set to the shape of the reverse twisted coil 100b.

[0053] It can be understood that in this embodiment, the multiple hairpin coils 100 are arranged into two types, namely, 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 stator core 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 exemplified that during the winding process, when the connection positions of the two hairpin coils 100 are far apart, they can also be connected through a bridge wire 200; the bridge wire 200 in this embodiment is used to connect two stacked coils 100a whose connection positions are far apart. The bridge wire 200 can include a bridge connection wire 210 and a bridge welding end 220, which can also be prepared and formed in an integrated manner, for example, using a flat enameled wire for preparation and forming. The bridge welding end 220 is arranged close to the welding end 120 of the hairpin coil 100, and is arranged in two; the two bridge welding ends 220 are respectively connected to one welding end 120 of the two stacked coils 100a, and the connection method can also be welding. The bridge connection wire 210 can extend along the circumference of the stator core 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 required odd-even mixed layer winding structure.

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

[0058] like Figure 3 and Figure 6As shown, in this embodiment, it is exemplarily explained that the pitch of the hairpin coil 100 is the number of stator slots 510 spaced between its two effective sides 110. It should be noted that when the hairpin coils 100 are of the same type, use the same cross-layer method and have the same pitch, they can be defined as hairpin coils 100 of the same linear type; and when one of them is not satisfied, they should be defined as hairpin coils 100 of different linear types. In this embodiment, the hairpin coil 100 has two types, 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. The reverse twisted coil 100b has only one cross-layer method, and its pitches are all the same.

[0059] For example, when m=6, the pitch of the stacked coil 100a across the first slot layer and the second slot layer with two effective sides 110 can be set to 6 slots, which is the first line type of the stacked coil 100a; the pitch of the stacked coil 100a across the third slot layer and the fourth 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 across the fifth slot layer and the sixth 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 across the seventh slot layer and the seventh 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 the present embodiment sets the hairpin coils 100 of the same type and the same cross-layer method to the same pitch, which can simplify the line types of the hairpin coils 100, thereby making the winding structure less prone to errors during the winding process and improving the winding efficiency of the winding structure.

[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 the 1st slot layer and the 2nd slot layer, two effective edges 110 span the 3rd slot layer and the 4th slot layer, two effective edges 110 span the 5th slot layer and the 6th slot layer, and two effective edges 110 span the 7th slot layer and the 7th slot layer, and the pitch of the hairpin coil 100 is 6 slots.

[0062] like Figure 3 and Figure 6As shown, in this embodiment, it is exemplarily explained that when Z=48, p=4, m=6, n=2 or 4, the odd-even mixed layer winding structure constitutes a three-phase winding structure of 48 slots, 8 poles, 6 layers and 2 branches in parallel or a three-phase winding structure of 48 slots, 8 poles, 6 layers and 4 branches in parallel. In the above two winding structures, the plurality of hairpin coils 100 include three types of stacked coils 100a and one type of reverse twisted coil 100b. The three types of stacked coils 100a are respectively two effective sides 110 spanning the first slot layer and the second slot layer with a pitch of 6 slots, two effective sides 110 spanning the third slot layer and the fourth slot layer with a pitch of 6 slots, and two effective sides 110 spanning the fifth slot layer and the sixth slot layer with a pitch of 6 slots; one type of reverse twisted coil 100b is two effective sides 110 spanning the seventh slot layer and the seventh slot layer with a pitch of 6 slots.

[0063] It can be understood that this embodiment facilitates winding to obtain a three-phase winding structure with 48 slots, 6 poles, 6 layers and 2 branches in parallel or a three-phase winding structure with 48 slots, 8 poles, 6 layers and 4 branches in parallel by reasonably setting the pitch and cross-layer mode of several hairpin coils 100.

[0064] More specifically, any winding branch has a wire input from the first slot layer of the stator slot 510 , and has a wire output from the first slot layer of the stator slot 510 .

[0065] like Figure 3 and Figure 6 As shown, in this embodiment, it is exemplarily explained that the first slot layer of the stator slot 510 is the slot layer of the stator slot 510 closest to the axis of the stator core 500, which is located at the innermost side of the stator 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 stator slot 510, and the wires are exited from the innermost side of the stator slot 510, that is, the wire entry position and the wire exit position are both set to the first slot layer of the stator 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] 1.1-7.2-2.1-8.2-1.3-7.4-2.3-8.4-1.5-7.6-2.5-8.6-1.7-7.7-14.6-8.5-13.6-7.5-14.4-8.3-13.4-7.3-14.2-8.1-13.2-7.1;

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

[0070] 13.1-19.2-14.1-20.2-13.3-19.4-14.3-20.4-13.5-19.6-14.5-20.6-13.7-19.7-26.6-20.5-25.6-19.5-26.4-20.3-25.4-19.3-26.2-20.1-25.2-19.1;

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

[0072] 25.1-31.2-26.1-32.2-25.3-31.4-26.3-32.24-25.5-31.6-26.5-32.6-25.7-31.7-38.6-32.5-37.6-31.5-38.4-32.3-37.4-31.3-38.2-32.1-37.2-31.1;

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

[0074] 37.1-43.2-38.1-44.2-37.3-43.4-38.3-44.4-37.5-43.6-38.5-44.6-37.7-43.7-2.6-44.5-1.6-43.5-2.4-44.3-1.4-43.3-2.2-44.1-1.2-43.1.

[0075] like Figure 3 As shown, in this embodiment, for example, 48 stator slots 510 can be represented by serial numbers "1"-"48", and the serial numbers "1"-"48" are only for the convenience of describing the 48 stator slots 510, and are not used to limit them. Any stator slot 510 of the stator core 500 can be used as the stator slot 510 with serial number "1", and the serial number can be increased in the clockwise direction of the stator core 500 or in the counterclockwise direction of the stator core 500, without specific limitation. In some embodiments, the need for 54 stator slots 510 can also be represented by other serial numbers.

[0076] like Figure 3As 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 "1.1-7.2" is the first hairpin coil 100, which is a lap-wound coil 100a, and its two effective sides 110 are respectively wound on the first slot layer of the stator slot 510 with the serial number "1" and the second slot layer of the stator 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 from the first slot layer of the stator slot 510 with the serial number "1", referring to Figure 3 U1 in the figure. The subsequent winding lines are similar, where the line corresponding to "1.7-7.7" is the reverse twisted coil 100b spanning the 7th slot layer and the 7th slot layer. The pitch of the reverse twisted coil 100b is 7 slots, and its two effective sides 110 are respectively arranged in the 7th slot layer of the stator slot 510 numbered "1" and the 7th slot layer of the stator slot 510 numbered "7". The line corresponding to "13.2-7.1" is the last hairpin coil 100, which is also a stacked coil 100a. Its two effective sides 110 are respectively wound in the 2nd slot layer of the stator slot 510 numbered "13" and the 1st slot layer of the stator slot 510 numbered "7", and its pitch is 6 slots; at the same time, it represents that the first winding branch of the U phase comes out from the 1st slot layer of the stator slot 510 numbered "7", refer to Figure 3 It should be noted that, in this embodiment, the first winding branch of the U phase is not provided with a bridge wire 200.

[0077] The second, third and fourth winding branches of the U phase are the same. The line corresponding to "13.1-19.2" 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 first slot layer of the stator slot 510 with the serial number "13", referring to Figure 3 U2 in the figure. The line corresponding to "25.2-19.1" 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 first slot layer of the stator slot 510 with the serial number "19", refer to Figure 3 X2 in.

[0078] The line corresponding to "25.1-31.2" is the first lapped coil 100a of the third winding branch, and its pitch is 6 slots; at the same time, it represents that the third winding branch of the U phase enters the first slot layer of the stator slot 510 with the serial number "25", referring to Figure 3 The line corresponding to "37.2-31.1" is the last lapped coil 100a of the third winding branch, and its pitch is 6 slots; at the same time, it represents that the third winding branch of the U phase is connected to the first slot layer of the stator slot 510 with the serial number "31", refer to Figure 3X3 in.

[0079] The line corresponding to "37.1-43.2" is the first lapped coil 100a of the fourth winding branch, and its pitch is 6 slots; at the same time, it represents that the fourth winding branch of the U phase enters the first slot layer of the stator slot 510 with the serial number "37", refer to Figure 3 The line corresponding to "1.2-43.1" is the last lapped coil 100a of the fourth winding branch, and its pitch is 6 slots; at the same time, it represents that the fourth winding branch of the U phase is connected to the first slot layer of the stator slot 510 with the serial number "43", refer to Figure 3 X4 in.

[0080] It is not difficult to see that the line-entry position and the line-out position of the first winding branch of the U phase are the 1st slot layer of the stator slot 510 numbered “1” and the 1st slot layer of the stator slot 510 numbered “7”, respectively; the line-entry position and the line-out position of the second winding branch of the U phase are the 1st slot layer of the stator slot 510 numbered “13” and the 1st slot layer of the stator slot 510 numbered “19”, respectively; the line-entry position and the line-out position of the third winding branch of the U phase are the 1st slot layer of the stator slot 510 numbered “25” and the 1st slot layer of the stator slot 510 numbered “31”, respectively; the line-entry position and the line-out position of the fourth winding branch of the U phase are the 1st slot layer of the stator slot 510 numbered “37” and the 1st slot layer of the stator slot 510 numbered “43”, respectively.

[0081] 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 stator slots 510 in the direction of increasing number of stator slots 510. Based on this, the entry positions of the four winding branches of the V phase are 5.1, 17.1, 29.1 and 41.1 respectively. Figure 2 V1, V2, V3 and V4 in the figure; the outlet positions of the four winding branches of phase V are 11.1, 23.1, 35.1 and 47.1 respectively, refer to Figure 2 Y1, Y2, Y3 and Y4 in the figure. The entry positions of the four winding branches of phase W are 9.1, 21.1, 33.1 and 45.1 respectively. Figure 2 W1, W2, W3 and W4 in the figure; the outlet positions of the four winding branches of phase W are 15.1, 27.1, 39.1 and 3.1 respectively, refer to Figure 2 Z1, Z2, Z3 and Z4 in .

[0082] like Figure 2As shown, in this embodiment, the odd-even mixed layer winding structure 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, it 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] More specifically, when n=2, the first winding branch of phase U is:

[0085] 1.1-7.2-2.1-8.2-1.3-7.4-2.3-8.4-1.5-7.6-2.5-8.6-1.7-7.7-14.6 -8.5-13.6-7.5-14.4-8.3-13.4-7.3-14.2-8.1-13.2-7.1-13.1-19.2-14.1

[0086] -20.2-13.3-19.4-14.3-20.4-13.5-19.6-14.5-20.6-13.7-19.7-26.6-20.5-25.6-19.5-26.4-20.3-25.4-19.3-26.2-20.1-25.2-19.1;

[0087] The second winding branch of phase U is:

[0088] 25.1-31.2-26.1-32.2-25.3-31.4-26.3-32.24-25.5-31.6-26.5-32.6-25.7-31.7-38.6-32.5-37.6-31.5-38.4-32.3-37.4-31.3-38.2-32.1-37.2-3 1.1-37.1-43.2-38.1-44.2-37.3-43.4-38.3-44.4-37.5-43.6-38.5-44.6-37.7-43.7-2.6-44.5-1.6-43.5-2.4-44.3-1.4-43.3-2.2-44.1-1.2-43.1.

[0089] like Figure 6 As shown, in this embodiment, it is exemplarily explained, and it is not difficult to see that Figure 6 The winding structure of the two parallel branches in the circuit can be obtained by Figure 3 The winding structure of the four parallel branches in the deformation is obtained, which can be specifically Figure 3 X1 and U1 in the winding structure of the four parallel branches are connected by a bridge line 200, and Figure 3 The X3 and U4 in the winding structure of the four parallel branches are connected by a bridge line 200 so that Figure 3 The first winding branch and the second winding branch of the parallel 4-branch winding structure are connected in series to form Figure 6 The first winding branch of the winding structure with two parallel branches, and Figure 3 The third winding branch and the fourth winding branch of the parallel 4-branch winding structure are connected in series to form Figure 6 The second winding branch of the winding structure of the two parallel branches in the embodiment of the present invention. In the two winding structures, the line type of the hairpin coil 100 can be exactly the same.

[0090] 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 "1.1-7.2" is the first hairpin coil 100, which is a lapped coil 100a, and its two effective sides 110 are respectively wound on the first slot layer of the stator slot 510 with the serial number "1" and the second slot layer of the stator slot 510 with the serial number "7", and its pitch is 6 slots; at the same time, it represents that the first winding branch of the U phase is wired from the first slot layer of the stator slot 510 with the serial number "1", refer to Figure 6U1′ in the figure. The subsequent winding lines are similar, where the line corresponding to "7.1-13.1" is a bridge line 200, which connects the two stacked coils 100a represented by the lines corresponding to "13.2-7.1" and "13.1-19.2". The line corresponding to "25.2-19.1" is the last hairpin coil 100, which is also a stacked coil 100a. Its two effective sides 110 are respectively wound on the second slot layer of the stator slot 510 numbered "25" and the first slot layer of the stator 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 comes out from the first slot layer of the stator slot 510 numbered "19", refer to Figure 6 X1′ in .

[0091] The same is true for the second winding branch of the U phase. The line corresponding to "25.1-31.2" 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 first slot layer of the stator slot 510 with the serial number "25", referring to Figure 6 U2′ in the figure. The line corresponding to “1.2-43.1” 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 first slot layer of the stator slot 510 with the serial number “43”, refer to Figure 6 X2′ in .

[0092] The winding circuits of phase V and phase W can be obtained in the same way and will not be elaborated here.

[0093] Of course, in other embodiments, Z, p and m can also be other parameters. For example, Z=72, p=6, m=4. In this embodiment, the cross-layer mode of several hairpin coils 100 includes: a stacked coil 100a with two effective sides 110 spanning the first slot layer and the second slot layer and two effective sides 110 spanning the third slot layer and the fourth slot layer, and a reverse twisted coil 100b with two effective sides 110 spanning the fifth slot layer and the fifth 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 1st slot layer and the 2nd slot layer, two effective edges 110 spanning the 3rd slot layer and the 4th slot layer, two effective edges 110 spanning the 5th slot layer and the 6th slot layer, and two effective edges 110 spanning the 7th slot layer and the 8th slot layer, and a reverse twisted coil 100b with two effective edges 110 spanning the 9th slot layer and the 9th slot layer.

[0094] The implementation principle of an odd-even mixed layer winding structure provided in the first embodiment of the present application is:

[0095] The punching sheets are stacked into a stator core 500, and then a plurality of hairpin coils 100 are wound on the stator 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 the first slot layer and the second slot layer, two effective sides 110 span the third slot layer and the fourth slot layer... two effective sides 110 span the stacked coil 100a of the (m-1)th slot layer and the mth slot layer, and two effective sides 110 span the (m+1)th slot layer and the (m+1)th slot layer. Then, the phase copper bar 300 and the star point copper bar 400 are connected at the specified positions of the 3n winding branches.

[0096] The present application sets the stator core 500 to a mixed slot type of m slot layers and m+1 slot layers, and reasonably sets the combination form and quantity of the stator slots 510, and at the same time, reasonably sets the cross-layer mode of the hairpin coils 100 of the winding structure, so as to prepare the required odd-even mixed layer winding structure. It has been verified that compared with the winding structure in which the slot type of the stator core 500 of the stator slots 510 is exactly the same and the even-numbered layer design is adopted, the odd-even mixed layer winding structure provided by the present application can effectively avoid the generation of large stator side magnetomotive force harmonics in the working process of the motor equipment, so as to reduce the proportion of back electromotive force harmonics, especially the proportion of high-order harmonics, and thus avoid the performance of the motor equipment from being affected.

[0097] Embodiment 2

[0098] Embodiment 2 of the present application provides a stator assembly, and the stator assembly includes any one of the odd-even mixed layer winding structures provided in the present application.

[0099] Embodiment 3

[0100] Embodiment 2 of the present application provides a motor device, and the motor device includes any stator assembly provided in the present application.

[0101] Comparative Example

[0102] The comparative example of the present application provides a winding structure of 48 slots, 8 poles, 6 layers and 4 branches in parallel with the same slot type of stator slots 510, which is used for comparison with the winding structure of 48 slots, 8 poles, odd-even mixed layers and 4 branches in parallel in Example 1 of the present application.

[0103] Application Example 1

[0104] The present application uses Example 1 to obtain the reverse potential spectrum of the motors applicable to the two winding structures provided in Example 1 and the comparative example. Under the premise that other parameters such as motor size / material usage are the same, the following can be obtained: Figure 8 and Fig. 9 The bar chart shown in Figure 8 Indicates the data of the motor to which the winding structure provided by the comparison is applicable. Fig. 9 The data of the motor to which the winding structure provided in the first embodiment is applicable are shown. Figure 8 and Fig. 9 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.

[0105] Application Example 2

[0106] The present application uses the second embodiment to compare the back electromotive force of the motors applicable to the two winding structures provided in the first embodiment and the comparative example, and obtains the following under the premise that the motor size / material usage and other parameters are the same: Fig.10 As shown in the comparison diagram, the red line represents the data of the motor to which the winding structure provided in the first embodiment is applicable, and the blue line represents the data of the motor to which the winding structure 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.

[0107] Application Example 3

[0108] The present application uses the third embodiment to compare the output performance of the motors applicable to the two winding structures provided in the first embodiment and the comparative example, and obtains the following results under the premise that the motor size / material usage and other parameters are the same: Fig.11 As shown in the comparison chart, the solid line represents the data of the motor to which the winding structure provided in the first embodiment is applicable, and the dotted line represents the data of the motor to which the winding structure provided in the comparative example is applicable. It is not difficult to see that the first embodiment of the present application can optimize the motor inductance, thereby increasing the output power of the motor at high speed by 6.2%; at the same time, the motor high efficiency range area can be increased by about 0.3%.

[0109] 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.

[0110] 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. An odd-even mixed layer winding structure, characterized in that: The odd-even mixed layer winding structure is used for a stator assembly, the number of poles of the stator assembly is 2p, the stator assembly further comprises a stator core (500), the stator core (500) is provided with Z stator slots (510) at equal intervals along the circumferential direction, wherein Z=12p; among the Z stator slots (510), every two stator slots (510) form a group, and in the same group of stator slots (510), one stator slot (510) located at the left position The stator slots (510) are sequentially provided with 1st, 2nd ... mth slot layers, and one of the stator slots (510) located at the right side is sequentially provided with 1st, 2nd ... (m+1)th slot layers, wherein m is an even number not less than 4; the odd-even mixed layer winding structure comprises winding circuits of three phases in total, namely, U, V and W, the winding circuits of the V phase and the W phase are obtained by sequentially translating the winding branch of the U phase by Z / 3p and 2Z / 3p stator slots (510), the winding circuit of each phase is completely wound in two stator slots (510) constituting the same group, and 4 stator slots (510) are evenly spaced; the winding circuit of each phase comprises n winding branches connected in parallel, each winding branch comprises a plurality of hairpin coils (100), the hairpin coils (100) comprise two effective sides (110) arranged at intervals, and the effective sides (110) are arranged in the stator slots. (510) in one of the slot layers; wherein the hairpin coil (100) is provided with m / 2+1 kinds of cross-layer modes: two of the effective edges (110) span the 1st slot layer and the 2nd slot layer, two of the effective edges (110) span the 3rd slot layer and the 4th slot layer... two of the effective edges (110) span the (m-1)th slot layer and the mth slot layer, and two of the effective edges (110) span the (m+1)th slot layer and the (m+1)th slot layer.

2. The odd-even mixed layer winding structure 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), wherein 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 a plurality of welding ends (120) of the lapped coil (100a). The two welding ends (120) of (100b) extend in the same direction, and the cross-layer method is that the two effective edges (110) cross the 1st slot layer and the 2nd slot layer, the two effective edges (110) cross the 3rd slot layer and the 4th slot layer... The hairpin coil (100) with two effective edges (110) crossing the (m-1)th slot layer and the mth slot layer are both the stacked coils (100a), and the cross-layer method is that the hairpin coil (100) with two effective edges (110) crossing the (m+1)th slot layer and the (m+1)th slot layer are both the reverse twisted coils (100b).

3. The odd-even mixed layer winding structure 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 odd-even mixed layer winding structure 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 odd-even mixed layer winding structure according to claim 4, characterized in that: Z=48, p=4, m=6, n=2 or 4, the cross-layer mode is that two of the effective edges (110) cross the first slot layer and the second slot layer, two of the effective edges (110) cross the third slot layer and the fourth slot layer, two of the effective edges (110) cross the fifth slot layer and the sixth slot layer, and two of the effective edges (110) cross the seventh slot layer and the seventh slot layer, and the pitch of the hairpin coil (100) is 6 slots.

6. The odd-even mixed layer winding structure according to claim 5, characterized in that: Any winding branch has wire input from the first slot layer of the stator slot (510) and wire output from the first slot layer of the stator slot (510).

7. The odd-even mixed layer winding structure according to claim 6, characterized in that: When n=4, the first winding branch of the U phase is: 1.1-7.2-2.1-8.2-1.3-7.4-2.3-8.4-1.5-7.6-2.5-8.6-1.7-7.7-14.6-8.5-13.6-7.5-14.4-8.3-13.4-7.3-14.2-8.1-13.2-7.1； The second winding branch of the U phase is: 13.1-19.2-14.1-20.2-13.3-19.4-14.3-20.4-13.5-19.6-14.5-20.6-13.7-19.7-26.6-20.5-25.6-19.5-26.4-20.3-25.4-19.3-26.2-20.1-25.2-19.1； The third winding branch of the U phase is: 25.1-31.2-26.1-32.2-25.3-31.4-26.3-32.24-25.5-31.6-26.5-32.6-25.7-31.7-38.6-32.5-37.6-31.5-38.4-32.3-37.4-31.3-38.2-32.1-37.2-31.1； The fourth winding branch of the U phase is: 37.1-43.2-38.1-44.2-37.3-43.4-38.3-44.4-37.5-43.6-38.5-44.6-37.7-43.7-2.6-44.5-1.6-43.5-2.4-44.3-1.4-43.3-2.2-44.1-1.2-43.1。 8. The odd-even mixed layer winding structure according to claim 6, characterized in that: When n=2, the first winding branch of the U phase is: 1.1-7.2-2.1-8.2-1.3-7.4-2.3-8.4-1.5-7.6-2.5-8.6-1.7-7.7-14.6 -8.5-13.6-7.5-14.4-8.3-13.4-7.3-14.2-8.1-13.2-7.1-13.1-19.2-14.1-20.2-13.3-19.4-14.3-20.4-13.5-19.6-14.5-20.6-13.7-19.7-26.6-20.5-25.6-19.5-26.4-20.3-25.4-19.3-26.2-20.1-25.2-19.1； The second winding branch of the U phase is: 25.1-31.2-26.1-32.2-25.3-31.4-26.3-32.24-25.5-31.6-26.5-32.6-25.7-31.7-38.6-32.5-37.6-31.5-38.4-32.3-37.4-31.3-38.2-32.1-37.2-31.1-37.1-43.2-38.1-44.2-37.3-43.4-38.3-44.4-37.5-43.6-38.5-44.6-37.7-43.7-2.6-44.5-1.6-43.5-2.4-44.3-1.4-43.3-2.2-44.1-1.2-43.1。 9. A stator assembly, characterized in that: The stator assembly includes the odd-even mixed layer winding structure as described in any phase of claims 1-8.

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

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