Odd-even layer winding structure, stator assembly and motor

Abstract

The invention relates to an odd-even layer winding structure, a stator assembly and a motor, the number of poles of the stator assembly is 2p, and a stator core is provided with Z stator slots; in the Z stator slots, every three stator slots form a group, in the same group of stator slots, the left stator slot and the middle stator slot are respectively provided with an L1 slot layer, an L2 slot layer,... an Lm-1 slot layer in sequence, and the right stator slot is provided with an L1 slot layer, an L2 slot layer,... an Lm slot layer in sequence; the odd-even layer winding structure comprises winding circuits 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 of crossing an L1 groove layer and an L2 groove layer, crossing an L3 groove layer and an L4 groove layer,... crossing an Lm-1 groove layer and an Lm groove layer, and crossing the Lm-1 groove layer and the Lm-1 groove layer. According to the odd-even layer winding structure provided by the invention, the peak power, the high-efficiency interval area proportion and the highest efficiency of the motor can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to an odd-even layer winding structure, 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 stator assembly to realize the conversion between mechanical energy and electrical energy through the principle of electromagnetic induction. In new energy vehicles, the application of the motor may include generators and motors, which are usually arranged in the form of flat wire motors. For the stator assembly, it is usually composed of a stator core and a winding structure wound on the stator core. The winding structure of the flat wire motor is usually composed of a number of hairpin coils, and the hairpin coils can be made of flat conductor materials. However, for the stator assembly in the prior art, the stator slots on the stator core are usually set to the same configuration, and the number of layers of the hairpin coils arranged in the stator slots is the same; and the number of layers of its winding structure is usually set to an even number of layers. When the motor is running, its power matching performance is poor, and the peak power, high efficiency interval area ratio and maximum efficiency of the motor are relatively low. Summary of the invention

[0003] Based on this, the present application provides an odd-even layer winding structure, a stator assembly and a motor to improve the problem in the prior art that the stator slot configuration of the stator core is the same and the same slot layers are arranged, and the winding structure is arranged to an even number of layers, resulting in relatively low peak power, high-efficiency range area ratio and maximum efficiency of the motor.

[0004] In a first aspect, the present application provides an odd-even layer winding structure, which is suitable 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, where Z=18p; among the Z stator slots, every 3 stator slots form a group, and in the same group of stator slots, the two stator slots located at the left position and the middle position are sequentially provided with L1, L2...Lm-1 slot layers, and the one stator slot located at the right position is sequentially provided with L1, L2...Lm slot layers, where m is an even number not less than 4; the odd-even layer winding structure includes winding circuits of three phases, U, V and W, and the winding circuits of the V phase and the W phase are composed of the U The winding branches of each phase are successively translated by Z / 3p and 2Z / 3p of the stator slots, and the winding circuit of each phase is completely wound in the three stator slots constituting the same group, and is evenly spaced by six stator slots; 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 stator 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, and the bridge wire connects the two hairpin coils.

[0007] In one embodiment, the stacked coils in the same cross-layer manner all have the same pitch, and the reverse twisted coils in the same cross-layer manner all have the same pitch or two pitches.

[0008] In one embodiment, Z=54, p=3, m=6, n=2, the cross-layer mode is that the pitches 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, and the two effective side spans L5 slot layer and L6 slot layer are all 9 slots, and the cross-layer mode is that the pitches of the hairpin coils of the two effective side spans L5 slot layer and L5 slot layer are all 9 slots or 10 slots.

[0009] In one embodiment, the first winding branch of the U phase is:

[0010] 1#L1-10#L2-2#L1-11#L2-3#L1-12#L2-1#L3-10#L4-2#L3-11#L4-3#L3-12#L4-1#L5 -10#L6-3#L5-12#L5-19#L6-10#L5-21#L4-12#L3-20#L4-11#L3-19#L4-10#L3-21#L 2-12#L1-20#L2-11#L1-19#L2-10#L1-19#L1-28#L2-20#L1-29#L2-21#L1-30#L2-19 #L3-28#L4-20#L3-29#L4-21#L3-30#L4-19#L5-28#L6-20#L5-29#L5-21#L5-11#L5;

[0011] The second winding branch of the U phase is:

[0012] 38#L5-48#L5-2#L5-47#L5-1#L6-46#L5-3#L4-48#L3-2#L4-47#L3-1#L4-46#L3-3#L 2-48#L1-2#L2-47#L1-1#L2-46#L1-37#L1-46#L2-38#L1-47#L2-39#L1-48#L2-37#L 3-46#L4-38#L3-47#L4-39#L3-48#L4-37#L5-46#L6-39#L5-30#L5-37#L6-28#L5-39 #L4-30#L3-38#L4-29#L3-37#L4-28#L3-39#L2-30#L1-38#L2-29#L1-37#L2-28#L1.

[0013] In one embodiment, Z=54, p=3, m=6, n=3, 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 9 slots.

[0014] In one embodiment, the first winding branch of the U phase is:

[0015] 1#L1-10#L2-2#L1-11#L2-3#L1-12#L2-1#L3-10#L4-2#L3-11#L4-3#L3-12#L4-1#L5-10#L6-2#L5-11#L5-3#L 5-12#L5-19#L6-10#L5-21#L4-12#L3-20#L4-11#L3-19#L4-10#L3-21#L2-12#L1-20#L2-11#L1-19#L2-10#L1;

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

[0017] 19#L1-28#L2-20#L1-29#L2-21#L1-30#L2-19#L3-28#L4-20#L3-29#L4-21#L3-30#L4-19#L5-28#L6-20#L5-29#L5- 21#L5-30#L5-37#L6-28#L5-39#L4-30#L3-38#L4-29#L3-37#L4-28#L3-39#L2-30#L1-38#L2-29#L1-37#L2-28#L1;

[0018] The third winding branch of the U phase is:

[0019] 37#L1-46#L2-38#L1-47#L2-39#L1-48#L2-37#L3-46#L4-38#L3-47#L4-39#L3-48#L4-37#L5-46#L6-38#L5-47 #L5-39#L5-48#L5-1#L6-46#L5-3#L4-48#L3-2#L4-47#L3-1#L4-46#L3-3#L2-48#L1-2#L2-47#L1-1#L2-46#L1.

[0020] In a second aspect, the present application provides a stator assembly, which includes any odd-even layer winding structure provided in the present application.

[0021] In a third aspect, the present application provides a motor, which includes any stator assembly provided in the present application.

[0022] The present application can prepare the required odd-even layer winding structure by setting several stator slots of the stator core to a mixed slot type of m-1 slot layers and m slot layers, and reasonably setting the combination form and number of several stator slots, and by reasonably setting the cross-layer mode of several hairpin coils of the winding structure. It has been verified that compared with the winding structure in which several stator slots of the matching stator core have exactly the same slot type and adopt an even-numbered layer design, the odd-even layer winding structure provided by the present application can effectively improve the peak power, high-efficiency interval area ratio and maximum efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of an odd-even layer winding structure provided in an embodiment of the present application when it is wound on a stator core;

[0024] Figure 2 A schematic diagram of the winding of an odd-even layer winding structure provided in an embodiment of the present application when the structure is 54 slots, 6 poles, 6 layers and 2 branches in parallel;

[0025] Figure 3 A schematic diagram of winding of the U phase when the odd-even layer winding structure provided in one embodiment of the present application is 54 slots, 6 poles, 6 layers and 2 branches in parallel;

[0026] Figure 4 A schematic structural diagram of a stacked coil of an odd-even layer winding structure provided in Embodiment 1 of the present application;

[0027] Figure 5 A schematic diagram of the structure of the reverse twisted coil of the odd-even layer winding structure provided in the first embodiment of the present application;

[0028] Figure 6 A schematic diagram of the structure of a bridge wire of an odd-even layer winding structure provided in Embodiment 1 of the present application;

[0029] Figure 7 A schematic diagram of winding of the U phase when the odd-even layer winding structure provided in one embodiment of the present application is 54 slots, 6 poles, 6 layers and 3 branches in parallel;

[0030] Figure 8 Output performance comparison diagram of Example 1 and Comparative Example provided for application Example 1 of the present application;

[0031] Fig. 9 The reverse potential spectrum diagram of the comparative example provided for the application of Example 2 of the present application;

[0032] Fig.10 The reverse potential spectrum diagram of Example 1 provided for the application of Example 2 of this application;

[0033] Fig.11 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;

[0034] Fig.12 A comparison chart of stator transient temperature curves of Example 1 and the comparative example provided for application Example 4 of the present application.

[0035] 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

[0036] 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.

[0037] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0038] 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.

[0039] 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.

[0040] Embodiment 1

[0041] Embodiment 1 of the present application provides an odd-even layer winding structure, which is applicable to a stator assembly, wherein the number of poles of the stator assembly is 2p, and the stator assembly further comprises a stator core 500, wherein the stator core 500 is provided with Z stator slots 510 at equal intervals along the circumferential direction, wherein Z=18p; among the Z stator slots 510, every three stator slots 510 form a group, and in the same group of stator slots 510, the two stator slots 510 located at the left position and the middle position are sequentially provided with L1, L2...Lm-1 slot layers, and the one stator slot 510 located at the right position is sequentially provided with L1, L2...Lm slot layers, wherein m is an even number not less than 4; the odd-even layer winding structure 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 translated from the winding branch of the U phase. Z / 3p and 2Z / 3p stator slots 510 are obtained, the winding circuit of each phase is completely wound in the three stator slots 510 constituting the same group, and 6 stator 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 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 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.

[0042] like Figure 1As shown, in this embodiment, it is exemplarily explained that the number of poles of the stator assembly can be set to 2p, where p can be a positive integer, which represents that the stator assembly includes p pairs of magnetic poles with opposite magnetic properties, and the p pairs of magnetic poles are evenly distributed in the circumferential direction of the stator assembly. The stator assembly may include a stator core 500 and a winding structure, wherein the stator core 500 can be prepared from a plurality of stator punchings, and the plurality of stator punchings can be prepared by a stacking process. The stator core 500 can be specifically set as a hollow cylindrical structure, and its stator slots 510 can be set on the inner side, and the stator slots 510 can be set to Z at equal intervals along the circumference thereof, where Z can be set to 18p. The stator slots 510 are used for winding the winding structure, and the winding structure is at least partially wound in the stator slots 510. According to the different distribution positions of the conductors of the winding structure in the stator slot 510, the stator slot 510 can be divided into several slot layers along the radial direction of the stator core 500, and each slot layer can be used to arrange a layer of conductors of the winding structure. The stator slot 510 in this embodiment has two numbers of slot layers, namely m-1 slot layers and m slot layers, where m is an even number not less than 4. The aforementioned slot layers can be represented by L1, L2...Lm-1 and Lm in sequence, and the mark "L?" is only for the convenience of describing the slot layers and is not used to limit them in any way. In some embodiments, several slot layers of the stator slot 510 can also be represented by other marks. Along the radial direction of the stator core 500, the L1...Lm-1 and Lm slot layers of the stator slot 510 are arranged in sequence from the inside to the outside. It is not difficult to see that the stator slot 510 with m slot layers must have a stator slot 510 with a length greater than the stator slot 510 with m-1 slot layers. In the aforementioned Z stator slots 510, every three stator slots 510 are arranged as a group, and in this embodiment, Z / 3 groups of stator slots 510 are arranged. In the same group of stator slots 510, the two stator slots 510 located at the left position and the middle position are arranged as m-1 slot layers, and the one stator slot 510 located at the right position is arranged as m slot layers. The aforementioned left position and right position may be relative positions when observing the two stator slots 510 in the same group 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 interchangeable.

[0043] like Figure 2As shown, the stator assembly can be applicable to a three-phase motor, and its 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 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, its winding structure may include winding branches of three phases, and the winding circuits of the three phases are electrically connected to form a three-phase circuit. For the winding branch of any phase, it is completely wound in three consecutive stator slots 510, and the three stator slots 510 are in the same group. At the same time, the winding circuit of any phase is also evenly spaced by 6 stator slots 510. In this embodiment, 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=6 and 2Z / 3p=12 stator slots 510 respectively; and based on this, 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 stator slots 510.

[0044] like Figure 2 and 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 3, 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 wound on the stator core 500 in the form of a slot, and at least part of it is wound in the stator slot 510. The conductor of the hairpin coil 100 arranged in the stator 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 stator slot 510. Under this structure, the shape of the hairpin coil 100 is similar to a "U" shape, so it can be called a "U"-shaped line. In contrast, when the hairpin coil 100 has only one effective side 110 , its shape is similar to an “I” shape, which can be called an “I”-shaped line.

[0045] 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.

[0046] It is not difficult to understand that the present application can prepare the required odd-even layer winding structure by setting the stator slots 510 of the stator core 500 to a mixed slot type of m-1 slot layers and m slot layers, and reasonably setting the combination form and quantity of the stator slots 510, and by reasonably setting the cross-layer mode of the hairpin coils 100 of the winding structure. It has been verified that compared with the winding structure in which the slot type of the stator slots 510 of the stator core 500 is exactly the same and the winding structure adopts an even-numbered layer design, the odd-even layer winding structure provided by the present application can effectively improve the peak power, high-efficiency interval area ratio and maximum efficiency of the motor.

[0047] 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 connects the other ends of the two effective edges 110. The hairpin coil 100 is provided with two shapes of a stacked coil 100a and a reverse twisted coil 100b. The two welding ends 120 of the stacked coil 100a extend in a direction 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.

[0048] like Figure 4 and Figure 5As shown, in this embodiment, it is exemplified that the hairpin coil 100 can be made of flat enameled wire so that the stator assembly has a higher slot fill rate. At this time, the hairpin coil 100 is integrally formed and can further include a welding end 120 and a hairpin end 130, wherein the welding end 120 is arranged in a one-to-one correspondence with the effective edge 110, that is, two welding ends 120 are arranged, and the two welding ends 120 are respectively arranged at the same end of the corresponding effective edge 110; the hairpin end 130 is arranged between the other ends of the two effective edges 110 and connected to the other ends of the two effective edges 110.

[0049] Several hairpin coils 100 can be set in two shapes, which can specifically include two shapes of lapped coils 100a and reverse twisted coils 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 to 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 in 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 in a shape similar to a "U" shape. When several 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, one lapped coil 100a may be connected to one reverse twisted coil 100b, in which case one welding end 120 of the lapped coil 100a is connected to one welding end 120 of the reverse twisted coil 100b, and the connection method may also be welding. Of course, two reverse twisted coils 100b may also be connected, in which case the two reverse twisted coils 100b are connected through one welding end 120 thereof, respectively, and the connection method may also be welding.

[0050] like Figures 3 to 5 As shown, in the present embodiment, the shape of the hairpin coil 100 adopting the specified cross-layer method is also specified. Specifically, the two effective sides 110 span the L1 slot layer and the L2 slot layer, the two effective sides 110 span the L3 slot layer and the L4 slot layer... the hairpin coil 100 with two effective sides 110 spanning the Lm-1 slot layer and the Lm slot layer are all stacked coils 100a; and the hairpin coil 100 with the cross-layer method having two effective sides 110 spanning the Lm-1 slot layer and the Lm-1 slot layer are all reverse twisted coils 100b.

[0051] 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 stator core 500 in a specified cross-layer manner to prepare the required stator assembly.

[0052] More specifically, each winding branch further includes a bridge wire 200 , and the bridge wire 200 connects two hairpin coils 100 .

[0053] like Figure 3 and Figure 6 As shown, in this embodiment, it is exemplified that for each winding branch, when the connection positions of the two hairpin coils 100 are far apart during the winding process, they can also be connected through the bridge wire 200. The bridge wire 200 can be used to connect two overlapping coils 100a whose connection positions are far apart, and can also be used to connect two reverse twisted coils 100b whose connection positions are far apart. The bridge wire 200 can also be integrally prepared by flat enameled wire, and 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 hairpin coils 100 one by one; the two bridge welding ends 220 are respectively set close to one welding end 120 of the two hairpin coils 100, and are welded and fixed for connection. The bridge connection wire 210 can be set to an arc shape, and extend along the circumference of the stator core 500 to connect the two bridge welding ends 220.

[0054] 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.

[0055] More specifically, the stacked coils 100a in the same cross-layer manner all have the same pitch, and the reverse twisted coils 100b in the same cross-layer manner all have the same pitch or two pitches.

[0056] like Figure 3As shown, in this embodiment, the pitch of the hairpin coil 100 is exemplarily explained as the number of stator 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. Based on this, the stacked coil 100a has m / 2 linear types. The reverse twisted coil 100b has only one cross-layer method and one or two pitches. Based on this, the anti-twist coil 100b has one or two line types.

[0057] For example, when m=6, the pitch of the stacked coil 100a with two effective sides 110 across the L1 slot layer and the L2 slot layer can be set to 9 slots, which is the first line type of the stacked coil 100a; the pitch of the stacked coil 100a across the L3 slot layer and the L4 slot layer can be set to 9 slots, which is the second line type of the stacked coil 100a; the pitch of the stacked coil 100a across the L5 slot layer and the L6 slot layer can be set to 9 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 across the L5 slot layer and the L5 slot layer can be set to 9 slots or 10 slots, which are two line types of the reverse twisted coil 100b respectively; or the pitch of the reverse twisted coil 100b with two effective sides 110 across the L5 slot layer and the L5 slot layer can be set to 9 slots, which is the only line type of the reverse twisted coil 100b.

[0058] It can be understood that in this embodiment, the stacked coils 100a with the same cross-layer method are set to one pitch, and the reverse twisted coils 100b with the same cross-layer method are set to one or two pitches, which can simplify the line types of the hairpin coil 100, thereby making the winding structure less prone to errors during the winding process, and at the same time improving the winding efficiency of the winding structure.

[0059] More specifically, Z=54, p=3, m=6, n=2, the cross-layer mode is that the pitch of the hairpin coil 100 with two effective edges 110 spanning the L1 slot layer and the L2 slot layer, the two effective edges 110 spanning the L3 slot layer and the L4 slot layer, and the two effective edges 110 spanning the L5 slot layer and the L6 slot layer are all 9 slots, and the cross-layer mode is that the pitch of the hairpin coil 100 with two effective edges 110 spanning the L5 slot layer and the L5 slot layer are both 9 slots or 10 slots.

[0060] like Figure 3As shown, in this embodiment, it is exemplarily explained that when Z=54, p=3, m=6, and n=2, the odd-even layer winding structure constitutes a three-phase winding structure with 54 slots, 6 poles, 6 layers, and 2 branches in parallel. In this winding structure, a plurality of hairpin coils 100 include three types of lapped coils 100a and two types of reverse twisted coils 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 9 slots, two effective sides 110 spanning L3 slot layer and L4 slot layer with a pitch of 9 slots, and two effective sides 110 spanning L5 slot layer and L6 slot layer with a pitch of 9 slots; the two types of reverse twisted coils 100b are respectively two effective sides 110 spanning L5 slot layer and L5 slot layer with a pitch of 9 slots, and two effective sides 110 spanning L5 slot layer and L5 slot layer with a pitch of 10 slots.

[0061] It can be understood that, in this embodiment, the pitch and the cross-layer mode of a plurality of hairpin coils 100 are reasonably set, so as to facilitate winding to obtain a three-phase winding structure with 54 slots, 6 poles, 6 layers and 2 parallel branches.

[0062] More specifically, the first winding branch of phase U is:

[0063] 1#L1-10#L2-2#L1-11#L2-3#L1-12#L2-1#L3-10#L4-2#L3-11#L4-3#L3-12#L4-1#L5 -10#L6-3#L5-12#L5-19#L6-10#L5-21#L4-12#L3-20#L4-11#L3-19#L4-10#L3-21#L 2-12#L1-20#L2-11#L1-19#L2-10#L1-19#L1-28#L2-20#L1-29#L2-21#L1-30#L2-19 #L3-28#L4-20#L3-29#L4-21#L3-30#L4-19#L5-28#L6-20#L5-29#L5-21#L5-11#L5;

[0064] The second winding branch of phase U is:

[0065] 38#L5-48#L5-2#L5-47#L5-1#L6-46#L5-3#L4-48#L3-2#L4-47#L3-1#L4-46#L3-3#L 2-48#L1-2#L2-47#L1-1#L2-46#L1-37#L1-46#L2-38#L1-47#L2-39#L1-48#L2-37#L 3-46#L4-38#L3-47#L4-39#L3-48#L4-37#L5-46#L6-39#L5-30#L5-37#L6-28#L5-39 #L4-30#L3-38#L4-29#L3-37#L4-28#L3-39#L2-30#L1-38#L2-29#L1-37#L2-28#L1.

[0066] like Figure 3 As shown, in this embodiment, 54 stator slots 510 can be represented by serial numbers "1#" to "54#", and the serial numbers "1#" to "54#" are only for the convenience of describing the 54 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, and there is no specific limitation. It should be noted that when the stator slot 510 is wound one circle along the direction of increasing serial number and continues to be wound, the serial number of the stator slot 510 is re-expressed as "1#"-"54#". For example, when the hairpin coil 100 with a pitch of 9 slots is first wound in the stator slot 510 with serial number "51#", it is then wound across 9 stator slots 510 in the stator slot 510 with serial number "51#+9#-54#=6#". When the stator slot 510 is wound one circle along the direction of decreasing serial number, the same can be obtained.

[0067] 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#L1-10#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 stator slot 510 with the serial number "1#" and the L2 slot layer of the stator slot 510 with the serial number "10#", and the pitch is 9 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 stator slot 510 with the serial number "1#", referring to FIG. Figure 3The subsequent winding lines are similar, wherein the hairpin coil 100 corresponding to the line "3#L5-12#L5" is a reverse twisted coil 100b, and its two effective sides 110 are respectively arranged in the L5 slot layer of the stator slot 510 with the serial number "3#" and the L5 slot layer of the stator slot 510 with the serial number "12#", and the pitch is 9 slots. The hairpin coil 100 corresponding to the line "20#L5-29#L5" is also a reverse twist coil 100b, and its two effective sides 110 are respectively wound on the L5 slot layer of the stator slot 510 with the serial number "20#" and the L5 slot layer of the stator slot 510 with the serial number "29#", and its pitch is 9 slots; in addition, the hairpin coil 100 corresponding to the line "21#L5-11#L5" is also a reverse twist coil 100b, and its two effective sides 110 are respectively wound on the L5 slot layer of the stator slot 510 with the serial number "21#" and the L5 slot layer of the stator slot 510 with the serial number "11#", and its pitch is 10 slots; at the same time, it represents that the first winding branch of the U phase is connected to the L5 slot layer of the stator slot 510 with the serial number "11", refer to Figure 3 X1 in . The line "10#L1-19#L1" corresponds to the bridge line 200, which connects the two stacked coils 100a corresponding to the line "19#L2-10#L1" and the line "19#L1-28#L2". In this embodiment, the line "29#L5-21#L5" also corresponds to the bridge line 200, which connects the two reverse twisted coils 100b corresponding to the line "20#L5-29#L5" and the line "21#L5-11#L5".

[0068] The second winding branch of the U phase is similar. Among them, "38#L5-48#L5" is the first hairpin coil 100 of the second winding branch, which is in the shape of a reverse twisted coil 100b, and its two effective sides 110 are respectively wound on the L5 slot layer of the stator slot 510 with the serial number "38#" and the L5 slot layer of the stator slot 510 with the serial number "48#", and its pitch is 10 slots; at the same time, it represents that the second winding branch of the U phase enters the L5 slot layer of the stator slot 510 with the serial number "38#", refer to Figure 3 The line corresponding to "37#L2-28#L1" is the last hairpin coil 100 of the second winding branch, which is in the shape of a lapped coil 100a with a pitch of 9 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 stator slot 510 with the serial number "28#", refer to Figure 3 X2 in.

[0069] like Figure 2As 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 6 and 12 stator slots 510 in the direction of increasing stator slot number 510. Based on this, the entry positions of the two winding branches of the V phase are 7#L1 and 44#L5 respectively. Figure 2 V1 and V2 in the figure; the outlet positions of the two winding branches of phase V are 17#L5 and 34#L1 respectively, refer to Figure 2 The two winding branches of phase W are located at 13#L1 and 50#L5, refer to Figure 2 W1 and W2 in the figure; the outlet positions of the two winding branches of phase W are 23#L5 and 40#L1 respectively. Figure 2 Z1 and Z2 in .

[0070] like Figure 2 As shown, in this embodiment, the odd-even 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, 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 and U2. 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.

[0071] 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, Y1, Y2, Z1 and Z2.

[0072] Specifically, Z=54, p=3, m=6, n=3, 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 9 slots.

[0073] like Figure 7As shown, in this embodiment, it is exemplarily explained that when Z=54, p=3, m=6, and n=3, the odd-even layer winding structure constitutes a three-phase winding structure with 54 slots, 6 poles, 6 layers, and 3 branches in parallel. In this winding structure, a 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 L1 slot layer and L2 slot layer with a pitch of 9 slots, two effective sides 110 spanning L3 slot layer and L4 slot layer with a pitch of 9 slots, and two effective sides 110 spanning L5 slot layer and L6 slot layer with a pitch of 9 slots; the only type of reverse twisted coil 100b is two effective sides 110 spanning L5 slot layer and L5 slot layer with a pitch of 9 slots.

[0074] It can be understood that, in this embodiment, the pitch and the cross-layer mode of a plurality of hairpin coils 100 are reasonably set, so as to facilitate winding to obtain a three-phase winding structure with 54 slots, 6 poles, 6 layers and 3 parallel branches.

[0075] More specifically, the first winding branch of phase U is:

[0076] 1#L1-10#L2-2#L1-11#L2-3#L1-12#L2-1#L3-10#L4-2#L3-11#L4-3#L3-12#L4-1#L5-10#L6-2#L5-11#L5-3#L 5-12#L5-19#L6-10#L5-21#L4-12#L3-20#L4-11#L3-19#L4-10#L3-21#L2-12#L1-20#L2-11#L1-19#L2-10#L1;

[0077] The second winding branch of phase U is:

[0078] 19#L1-28#L2-20#L1-29#L2-21#L1-30#L2-19#L3-28#L4-20#L3-29#L4-21#L3-30#L4-19#L5-28#L6-20#L5-29#L5- 21#L5-30#L5-37#L6-28#L5-39#L4-30#L3-38#L4-29#L3-37#L4-28#L3-39#L2-30#L1-38#L2-29#L1-37#L2-28#L1;

[0079] The third winding branch of phase U is:

[0080] 37#L1-46#L2-38#L1-47#L2-39#L1-48#L2-37#L3-46#L4-38#L3-47#L4-39#L3-48#L4-37#L5-46#L6-38#L5-47 #L5-39#L5-48#L5-1#L6-46#L5-3#L4-48#L3-2#L4-47#L3-1#L4-46#L3-3#L2-48#L1-2#L2-47#L1-1#L2-46#L1.

[0081] like Figure 7 As shown, in this embodiment, it is exemplarily explained that, taking the first winding branch of the U phase as an example, in the first winding branch of the U phase, the line corresponding to "19#L1-28#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 stator slot 510 with the serial number "19#" and the L2 slot layer of the stator slot 510 with the serial number "28#", and the pitch is 9 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 stator slot 510 with the serial number "19#", and the reference Figure 7 The subsequent winding lines are similar, wherein the hairpin coil 100 corresponding to the line "2#L5-11#L5" is a reverse twisted coil 100b, and its two effective sides 110 are respectively arranged in the L5 slot layer of the stator slot 510 with the serial number "2#" and the L5 slot layer of the stator slot 510 with the serial number "11#", and the pitch is 9 slots. The hairpin coil 100 corresponding to the line "3#L5-12#L5" is also a reverse twisted coil 100b, and its two effective sides 110 are respectively wound on the L5 slot layer of the stator slot 510 with the serial number "3#" and the L5 slot layer of the stator slot 510 with the serial number "12#", and its pitch is 9 slots; and the line "19#L2-10#L1" corresponds to the last hairpin coil 100 of the second winding branch, which is a lapped coil 100a, and its two effective sides 110 are respectively wound on the L2 slot layer of the stator slot 510 with the serial number "19#" and the L1 slot layer of the stator slot 510 with the serial number "10#", and its pitch is 9 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 stator slot 510 with the serial number "10", refer to Figure 7 The line "11#L5-3#L5" corresponds to the bridge line 200, which connects the two reverse twisted coils 100b corresponding to the line "2#L5-11#L5" and the line "3#L5-12#L5".

[0082] The second and third winding branches of the U phase are the same. The line "19#L1-28#L2" is the first hairpin coil 100 of the second 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 stator slot 510 with the serial number "19#" and the L2 slot layer of the stator slot 510 with the serial number "28#", and its pitch is 9 slots; at the same time, it represents that the second winding branch of the U phase enters the L1 slot layer of the stator slot 510 with the serial number "19#", refer to Figure 7 U2′ in the figure. The line corresponding to “37#L2-28#L1” is the last hairpin coil 100 of the second winding branch, which is in the shape of a lapped coil 100a with a pitch of 9 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 stator slot 510 with the serial number “28#”, refer to Figure 7 X2′ in the figure. The line “37#L1-46#L2” is the first hairpin coil 100 of the third 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 stator slot 510 with the serial number “37#” and the L2 slot layer of the stator slot 510 with the serial number “46#”, and its pitch is 9 slots; at the same time, it represents that the third winding branch of the U phase enters the L1 slot layer of the stator slot 510 with the serial number “37#”, referring to Figure 7 U3′ in the figure. The line corresponding to “1#L2-46#L1” is the last hairpin coil 100 of the third winding branch, which is in the shape of a lapped coil 100a with a pitch of 9 slots; at the same time, it represents that the second winding branch of the U phase is the L1 slot layer of the stator slot 510 with the serial number “46#”, refer to Figure 7 X3′ in .

[0083] The winding circuits of phase V and phase W can be obtained in the same way and will not be elaborated here.

[0084] Of course, in other embodiments, Z, p and m may also be other parameters. For example, Z=72, p=4, 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=108, p=6, 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 1L layer and the 2L 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.

[0085] The implementation principle of an odd-even layer winding structure provided in the first embodiment of the present application is:

[0086] The stator 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 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 specified positions of the 3n winding branches.

[0087] The present application can prepare the required odd-even layer winding structure by setting the stator slots 510 of the stator core 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 stator slots 510, and by reasonably setting the cross-layer mode of the hairpin coils 100 of the winding structure. It has been verified that compared with the winding structure in which the slot type of the stator slots 510 of the stator core 500 matched therewith is exactly the same and an even-number-layer design is adopted, the odd-even layer winding structure provided by the present application can effectively improve the peak power, high-efficiency interval area ratio and maximum efficiency of the motor.

[0088] Embodiment 2

[0089] Embodiment 2 of the present application provides a stator assembly, and the stator assembly includes any odd-even layer winding structure provided in the present application.

[0090] Embodiment 3

[0091] Embodiment 3 of the present application provides a motor, which includes any stator assembly provided in the present application.

[0092] Comparative Example

[0093] The comparative example of the present application provides a winding structure of 54 slots, 6 poles, 6 layers, and 2 branches in parallel with the same slot type of stator slots 510, which is used for comparison with the winding structure of 54 slots, 6 poles, odd-even mixed layers, and 2 branches in parallel in Example 1 of the present application.

[0094] Application Example 1

[0095] The present application embodiment 1 compares the output performance of the motors to which the two winding structures provided in the embodiment 1 and the comparative example are applicable, and obtains the following results under the premise that the motor size / material usage and other parameters are the same: Figure 8The comparison chart shown in the figure shows that the solid line shows the data of the motor to which the winding structure provided in the first embodiment is applicable, and the dotted line shows 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 increase the peak power of the motor by 12.4%; at the same time, the proportion of the motor's high-efficiency range area is increased by 1.2%-6.1%, and the maximum efficiency is increased by 0.4%.

[0096] Application Example 2

[0097] The present application applies Example 2 to obtain the reverse potential spectrum of the motors applicable to the two winding structures provided in Example 1 and the comparative example, respectively. Under the premise that other parameters such as motor size / material usage are the same, the following can be obtained: Fig. 9 and Fig.10 The bar chart shown in Fig. 9 Indicates the data of the motor to which the winding structure provided by the comparison is applicable. Fig.10 The data of the motor to which the winding structure provided in the first embodiment is applicable are shown. Fig. 9 and Fig.10 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.

[0098] Application Example 3

[0099] The present application uses the third 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.11 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.

[0100] Application Example 4

[0101] The present application uses the fourth embodiment to compare the stator transient temperature curves 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.12 The comparison chart shown in FIG. 1 shows that the blue line shows the data of the motor to which the winding structure provided in Example 1 is applicable, and the red line shows the data of the motor to which the winding structure provided in the comparative example is applicable. It is not difficult to see that Example 1 of the present application has lower required electrical density / line load and lower copper loss and heat generation under the same peak power output. In detail, the peak temperature of the winding structure is relatively reduced by 28°C.

[0102] 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.

[0103] 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 layer winding structure, characterized in that: The odd-even layer winding structure is suitable 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=18p; in the Z stator slots (510), every three stator slots (510) form a group, and in the same group of stator slots (510), the two stator slots (510) located at the left position and the two stator slots (510) located at the middle position are sequentially provided with L1, L2...Lm-1 slot layers, and the one stator slot (510) located at the right position is sequentially provided with L1, L2...Lm slot layers, wherein m is an even number not less than 4; the odd-even layer winding structure 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 of the winding branches of the U phase. The stator slots (510) are obtained, and the winding circuit of each phase is completely wound in three stator slots (510) constituting the same group, and six stator 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 coils (100) include two effective sides (110) arranged at intervals, and the effective sides (110) are arranged In one of the slot layers of the stator slot (510); wherein the hairpin coil (100) is provided with m / 2+1 kinds of cross-layer modes: two of the effective edges (110) span the L1 slot layer and the L2 slot layer, two of the effective edges (110) span the L3 slot layer and the L4 slot layer... two of the effective edges (110) span the Lm-1 slot layer and the Lm slot layer, and two of the effective edges (110) span the Lm-1 slot layer and the Lm-1 slot layer.

2. The odd-even 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), 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 odd-even 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 the two hairpin coils (100).

4. The odd-even layer winding structure according to claim 3, characterized in that: The stacked coils (100a) of the same cross-layer method all have the same pitch, and the reverse twisted coils (100b) of the same cross-layer method all have the same pitch or two pitches.

5. The odd-even layer winding structure according to claim 4, characterized in that: Z=54, p=3, m=6, n=2, the cross-layer mode is that the pitch of the hairpin coil (100) when 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, and two of the effective edges (110) cross the L5 slot layer and the L6 slot layer are all 9 slots, and the cross-layer mode is that the pitch of the hairpin coil (100) when two of the effective edges (110) cross the L5 slot layer and the L5 slot layer are all 9 slots or 10 slots.

6. The odd-even layer winding structure according to claim 5, characterized in that: The first winding branch of the U phase is: 1#L1-10#L2-2#L1-11#L2-3#L1-12#L2-1#L3-10#L4-2#L3-11#L4-3#L3-12#L4-1#L5 -10#L6-3#L5-12#L5-19#L6-10#L5-21#L4-12#L3-20#L4-11#L3-19#L4-10#L3-21#L 2-12#L1-20#L2-11#L1-19#L2-10#L1-19#L1-28#L2-20#L1-29#L2-21#L1-30#L2-19 #L3-28#L4-20#L3-29#L4-21#L3-30#L4-19#L5-28#L6-20#L5-29#L5-21#L5-11#L5; The second winding branch of the U phase is: 38#L5-48#L5-2#L5-47#L5-1#L6-46#L5-3#L4-48#L3-2#L4-47#L3-1#L4-46#L3-3#L 2-48#L1-2#L2-47#L1-1#L2-46#L1-37#L1-46#L2-38#L1-47#L2-39#L1-48#L2-37#L 3-46#L4-38#L3-47#L4-39#L3-48#L4-37#L5-46#L6-39#L5-30#L5-37#L6-28#L5-39 #L4-30#L3-38#L4-29#L3-37#L4-28#L3-39#L2-30#L1-38#L2-29#L1-37#L2-28#L1.

7. The odd-even layer winding structure according to claim 4, characterized in that: Z=54, p=3, m=6, n=3, 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 9 slots.

8. The odd-even layer winding structure according to claim 7, characterized in that: The first winding branch of the U phase is: 1#L1-10#L2-2#L1-11#L2-3#L1-12#L2-1#L3-10#L4-2#L3-11#L4-3#L3-12#L4-1#L5-10#L6-2#L5-11#L5-3#L 5-12#L5-19#L6-10#L5-21#L4-12#L3-20#L4-11#L3-19#L4-10#L3-21#L2-12#L1-20#L2-11#L1-19#L2-10#L1; The second winding branch of the U phase is: 19#L1-28#L2-20#L1-29#L2-21#L1-30#L2-19#L3-28#L4-20#L3-29#L4-21#L3-30#L4-19#L5-28#L6-20#L5-29#L5- 21#L5-30#L5-37#L6-28#L5-39#L4-30#L3-38#L4-29#L3-37#L4-28#L3-39#L2-30#L1-38#L2-29#L1-37#L2-28#L1; The second winding branch of the U phase is: 37#L1-46#L2-38#L1-47#L2-39#L1-48#L2-37#L3-46#L4-38#L3-47#L4-39#L3-48#L4-37#L5-46#L6-38#L5-47 #L5-39#L5-48#L5-1#L6-46#L5-3#L4-48#L3-2#L4-47#L3-1#L4-46#L3-3#L2-48#L1-2#L2-47#L1-1#L2-46#L1.

9. A stator assembly, characterized in that: The stator assembly includes the odd-even 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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