Odd / even layer winding structure, stator assembly and motor

Abstract

This application relates to an odd-even layer winding structure, a stator assembly, and a motor. The stator assembly has 2p poles, and the stator core has Z stator slots. Within these Z slots, every three slots form a group. In each group, the left and middle slots are sequentially arranged with slot layers L1, L2…Lm-1, and the right slot is also sequentially arranged with slot layers L1, L2…Lm. The odd-even layer winding structure includes three phases of winding lines. Each phase includes n winding branches, and each branch includes several hairpin coils. The hairpin coils are configured with m / 2+1 different layer crossing methods: crossing slot layers L1 and L2, L3 and L4…Lm-1 and Lm, and Lm-1 and Lm-1. The odd-even layer winding structure provided by this application can effectively improve the motor's peak power, high-efficiency area ratio, and maximum efficiency.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to an odd-even layer winding structure, a stator assembly, and a motor. Background Technology

[0002] An electric motor can include a stator assembly and a rotor assembly. The stator assembly is fixed inside the motor housing, while the rotor assembly is rotatably arranged within the stator assembly to convert mechanical energy into electrical energy through electromagnetic induction. In new energy vehicles, the application of electric motors can include generators and motors, which are typically configured as flat-wire motors. The stator assembly usually consists of a stator core and windings wound around it. The windings of a flat-wire motor typically consist of several hairpin coils, which can be made of flat conductor materials. However, in existing stator assemblies, the stator slots on the stator core are usually configured with the same shape, and the number of hairpin coils arranged in the same number of layers within the slots is also the same. Furthermore, the number of layers in the winding structure is usually even. When the motor is running, its power matching performance is poor, resulting in relatively low peak power, high-efficiency area ratio, and maximum efficiency. Summary of the Invention

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

[0004] In a first aspect, this application provides an odd-even layer winding structure applicable to a stator assembly. The stator assembly has 2p poles and includes a stator core. The stator core has Z stator slots evenly spaced circumferentially, where Z = 18p. In the Z stator slots, every three slots form a group. In the same group, the two slots located on the left and the two located in the middle are sequentially provided with slot layers L1, L2...Lm-1, and the one slot located on the right is sequentially provided with slot layers L1, L2...Lm, where m is an even number not less than 4. The odd-even layer winding structure includes three phase winding lines: U, V, and W. The winding lines of phase V and phase W are formed by the U... The winding branches of each phase are sequentially shifted by Z / 3p and 2Z / 3p stator slots. The winding lines of each phase are completely wound in the three stator slots that constitute the same group, and are evenly spaced by six stator slots. The winding lines of each phase include n parallel winding branches, and each winding branch includes several hairpin coils. Each hairpin coil includes two spaced effective sides, which are located in one of the slot layers of the stator slot. The hairpin coils are configured with m / 2+1 cross-layer methods: the two effective sides cross the L1 slot layer and the L2 slot layer, the two effective sides cross the L3 slot layer and the L4 slot layer, ..., the two effective sides cross the Lm-1 slot layer and the Lm slot layer, and the two effective sides cross the Lm-1 slot layer and the Lm-1 slot layer.

[0005] In one embodiment, the hairpin coil further includes a soldering end and a hairpin end. Two soldering ends are provided, located at the same end of the two effective sides. The hairpin end connects to the other end of the two effective sides. The hairpin coil has two types: a lapped coil and a reverse-twist coil. The two soldering ends of the lapped coil extend in a direction close to each other, while the two soldering ends of the reverse-twist coil extend in the same direction. The layer crossing method is as follows: the two effective sides cross L1 slot layer and L2 slot layer; the two effective sides cross L3 slot layer and L4 slot layer… The hairpin coils with the two effective sides crossing Lm-1 slot layer and Lm slot layer are all lapped coils. The hairpin coils with the two effective sides crossing Lm-1 slot layer and Lm-1 slot layer are all reverse-twist coils.

[0006] In one embodiment, each winding branch also includes a bridging wire that connects the two hairpin coils.

[0007] In one embodiment, the lapped coils of the same cross-layer method all have the same pitch, and the anti-twist coils of the same cross-layer method all have the same pitch or two different pitches.

[0008] In one embodiment, Z=54, p=3, m=6, n=2, the cross-layer method is that the pitch of the hairpin coil spanning the L1 and L2 slot layers, the L3 and L4 slot layers, and the L5 and L6 slot layers is 9 slots, and the cross-layer method is that the pitch of the hairpin coil spanning the L5 and L6 slot layers is 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 coil spanning the L1 and L2 slot layers, the L3 and L4 slot layers, the L5 and L6 slot layers, and the L5 and L6 slot layers is 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] Secondly, this application provides a stator assembly, which includes any of the odd-even layer winding structures provided in this application.

[0021] Thirdly, this application provides an electric motor, which includes any of the stator assemblies provided in this application.

[0022] This application achieves the desired odd-even layer winding structure by configuring several stator slots of the stator core into a mixed slot type of m-1 slot layers and m slot layers, and by rationally setting the combination form and number of several stator slots. Simultaneously, by rationally setting the cross-layer arrangement of several hairpin coils in the winding structure, the desired odd-even layer winding structure can be fabricated. Verification has shown that, compared to a winding structure with identical slot types and an even-numbered layer design for several stator slots of the matching stator core, the odd-even layer winding structure provided in this application can effectively improve the motor's peak power, high-efficiency area ratio, and maximum efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of the present application showing an odd-even layer winding structure wound on a stator core.

[0024] Figure 2 A schematic diagram of the winding structure of the odd and even layer winding provided in an embodiment of this application, which is a 54-slot, 6-pole, 6-layer, parallel 2-branch winding;

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

[0026] Figure 4 A schematic diagram of the lapped coil structure of the odd-even layer winding structure provided in Embodiment 1 of this application;

[0027] Figure 5 A schematic diagram of the anti-torsion coil of the odd-even layer winding structure provided in Embodiment 1 of this application;

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

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

[0030] Figure 8 A comparison chart of the output performance of Example 1 and the comparative example provided for the application of Example 1 of this application;

[0031] Figure 9 The opposite potential spectrum diagram of the comparative example provided in Embodiment 2 of this application;

[0032] Figure 10 The opposite potential spectrum diagram of Embodiment 1 provided for Application Embodiment 2 of this application;

[0033] Figure 11 A comparison diagram of the back potential of Embodiment 1 and the comparative example provided for the application embodiment 3 of this application;

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

[0035] Reference numerals: 100, hairpin coil; 100a, lapped coil; 100b, reverse twisted coil; 110, effective side; 120, welding end; 130, hairpin end; 200, bridging wire; 210, bridging connection wire; 220, bridging welding end; 300, phase copper busbar; 400, star copper busbar; 500, stator core; 510, stator slot. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention.

[0038] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0039] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] Example 1

[0041] Embodiment 1 of this application provides an odd-even layer winding structure, which is applicable to a stator assembly. The stator assembly has 2p poles and includes a stator core 500. The stator core 500 has Z stator slots 510 evenly spaced along the circumference, where Z = 18p. In the Z stator slots 510, every three stator slots 510 form a group. In the same group of stator slots 510, the two stator slots 510 located on the left and in the middle are sequentially provided with slot layers L1, L2...Lm-1, and the stator slot 510 located on the right is sequentially provided with slot layers L1, L2...Lm, where m is an even number not less than 4. The odd-even layer winding structure includes three phase winding lines: U, V, and W. The winding lines of phases V and W are sequentially shifted from the winding branches of phase U. Z / 3p and 2Z / 3p stator slots 510 are obtained, and the winding line of each phase is completely wound in the three stator slots 510 that constitute the same group, and is evenly spaced by six stator slots 510; the winding line of each phase includes n parallel winding branches, and each winding branch includes several hairpin coils 100. The hairpin coil 100 includes two spaced effective sides 110, and the effective sides 110 are set in one of the slot layers of the stator slot 510; wherein, the hairpin coil 100 is provided with m / 2+1 cross-layer methods: the two effective sides 110 cross the L1 slot layer and the L2 slot layer, the two effective sides 110 cross the L3 slot layer and the L4 slot layer, ... the two effective sides 110 cross the Lm-1 slot layer and the Lm slot layer, and the two effective sides 110 cross the Lm-1 slot layer and the Lm-1 slot layer.

[0042] like Figure 1As shown in this embodiment, the number of poles in the stator assembly can be set to 2p, where p can be a positive integer, representing that the stator assembly includes p pairs of magnetically opposite poles, and the p pairs of poles are evenly distributed circumferentially in the stator assembly. The stator assembly may include a stator core 500 and a winding structure, wherein the stator core 500 can be made from a plurality of stator laminations, and the plurality of stator laminations can be manufactured by a lamination process. Specifically, the stator core 500 can be configured as a hollow cylindrical structure, and its stator slots 510 can be disposed on the inner side, and the stator slots 510 can be set to Z at equal intervals along its circumference, 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 within the stator slots 510. Depending on the distribution of the conductors of the winding structure within the stator slot 510, the stator slot 510 can be divided into several slot layers along the radial direction of the stator core 500. Each slot layer can be used to arrange one layer of conductors for the winding structure. In this embodiment, the stator slot 510 has two numbers of slot layers: 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 sequentially as L1, L2...Lm-1 and Lm. The designation "L?" is only for ease of description and is not intended to limit them in any way. In some embodiments, the slot layers of the stator slot 510 can also be represented by other designations. Along the radial direction of the stator core 500, the L1...Lm-1 and Lm slot layers of the stator slot 510 are arranged sequentially from the inside out. It is easy to see that the length of the stator slot 510 with m slot layers is necessarily greater than that of the stator slot 510 with m-1 slot layers. In the aforementioned Z stator slots 510, every three stator slots 510 are configured as a group; in this embodiment, Z / 3 groups of stator slots 510 are provided. Within the same group of stator slots 510, the two slots 510 located on the left and the two slots located in the middle are configured as m-1 slot layers, while the one slot 510 located on the right is configured as m slot layers. The aforementioned left and right positions can be the relative positions of the two stator slots 510 in the same group when viewed from above at the end of the stator core 500. In some embodiments, the left and right positions can be adaptively interchanged.

[0043] like Figure 2As shown, the stator assembly can be applied to a three-phase motor, where the three phases can be U-phase, V-phase, and W-phase. The designations "U," "V," and "W" are merely for descriptive purposes and are not intended to limit the three phases of the stator assembly. In some embodiments, other designations may be used to represent the three phases of the stator assembly. When the stator assembly is three-phase, its winding structure may include three-phase winding branches, which are electrically connected to form a three-phase circuit. For any one phase winding branch, it is completely wound within three consecutive stator slots 510, and these three stator slots 510 are in the same group. Simultaneously, the winding branches of any one phase are evenly spaced six stator slots 510 apart. In this embodiment, the winding lines of the V phase and the winding lines of the W phase can be obtained by shifting the winding lines of the U phase by Z / 3p = 6 and 2Z / 3p = 12 stator slots 510, respectively. Based on this, the winding lines of the U phase, V phase and W phase can be arranged in a staggered manner without overlapping or interference, and the winding lines of the U phase, V phase and W phase can fill 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, to obtain various motors such as low voltage or high voltage. For any winding branch, it includes several hairpin coils 100. The hairpin coils 100 are wound on the stator core 500 in a slot manner, and at least part of them are wound in the stator slots 510. The part of the conductor of the hairpin coil 100 arranged in the stator slots 510 can be called its effective side 110. In this embodiment, each of the several hairpin coils 100 is provided with two effective sides 110, the two effective sides 110 are spaced apart, and are respectively arranged in one slot layer of a stator slot 510. Under this structure, the shape of the hairpin coil 100 is similar to "U", and therefore it can be called a "U" shaped wire. In contrast, when the hairpin coil 100 has only one effective edge 110, its shape is similar to the "I" shape, and it can be called an "I" shaped line.

[0045] In this embodiment, each of the hairpin coils 100 has a specified layer crossing method, which is specifically m / 2+1 types. The first type is that the two effective edges 110 of the hairpin coil 100 cross the L1 slot layer and the L2 slot layer. The second type is that the two effective edges 110 of the hairpin coil 100 cross the L3 slot layer and the L4 slot layer. The m / 2 type is that the two effective edges 110 of the hairpin coil 100 cross the Lm-1 slot layer and the L1 slot layer. The m / 2+1 type is that the two effective edges 110 of the hairpin coil 100 cross the Lm-1 slot layer and the Lm-1 slot layer. For example, when m=6, there are four ways for several hairpin coils 100 to cross layers: two effective edges 110 cross L1 slot layer and L2 slot layer, two effective edges 110 cross L3 slot layer and L4 slot layer, two effective edges 110 cross L5 slot layer and L6 slot layer, and two effective edges 110 cross L5 slot layer and L5 slot layer.

[0046] It is easy to understand that this application can prepare the required odd-even layer winding structure by setting several stator slots 510 of the stator core 500 into a mixed slot type of m-1 slot layers and m slot layers, and by reasonably setting the combination form and number of several stator slots 510, and by reasonably setting the cross-layer method of several hairpin coils 100 in the winding structure. Verification has shown that, compared to the winding structure of the matching stator core 500 with several stator slots 510 having the same slot type and using an even-numbered layer design, the odd-even layer winding structure provided by this application can effectively improve the peak power, high-efficiency 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. There are two welding ends 120, which are located at the same end of the two effective sides 110. The hairpin end 130 connects to the other end of the two effective sides 110. The hairpin coil 100 has two shapes: a lapped coil 100a and a reverse twisted coil 100b. The two welding ends 120 of the lapped coil 100a extend in a direction that approaches each other, and the two welding ends 120 of the reverse twisted coil 100b extend in the same direction. The layer crossing method is that the two effective sides 110 cross the L1 slot layer and the L2 slot layer, the two effective sides 110 cross the L3 slot layer and the L4 slot layer, and so on. The hairpin coils 100 that cross the Lm-1 slot layer and the Lm slot layer are all lapped coils 100a. The hairpin coils 100 that cross the Lm-1 slot layer and the Lm-1 slot layer are all reverse twisted coils 100b.

[0048] like Figure 4 and Figure 5As shown in this embodiment, by way of example, the hairpin coil 100 can be made of flat enameled wire to make the stator assembly have a high slot fill factor. In this case, the hairpin coil 100 is integrally formed and can also include a welding end 120 and a hairpin end 130. The welding end 120 is configured to correspond one-to-one with the effective edge 110, that is, there are two welding ends 120, and the two welding ends 120 are respectively set at the same end of their corresponding effective edge 110. The hairpin end 130 is set between the other ends of the two effective edges 110 and is connected to the other ends of the two effective edges 110.

[0049] Several hairpin coils 100 can be configured in two shapes, specifically including overlapping coils 100a and reverse-twisted coils 100b. When the hairpin coil 100 is an overlapping coil 100a, its two welding ends 120 extend obliquely in a direction close to each other to form a constricted 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 an overlapping coil 100a, its hairpin end 130 can be configured in a shape similar to a "V"; when the hairpin coil 100 is a reverse-twisted coil 100b, its hairpin end 130 can be configured in a shape similar to a "U". When several hairpin coils 100 are wound continuously, two overlapping coils 100a can be adjacent and connected, and the two overlapping coils 100a are connected through one of their welding ends 120, which can be welded and fixed. Alternatively, one lapped coil 100a can be connected to one reverse twisted coil 100b. In this 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 can also be welding. Of course, two reverse twisted coils 100b can also be connected. In this case, the two reverse twisted coils 100b are each connected through one of their welding ends 120, and the connection method can also be welding.

[0050] like Figures 3 to 5 As shown, in this embodiment, the shape of the hairpin coil 100 with a specified cross-layer method is also specified. Specifically, the hairpin coil 100 with two effective edges 110 crossing L1 slot layer and L2 slot layer, two effective edges 110 crossing L3 slot layer and L4 slot layer, ... two effective edges 110 crossing Lm-1 slot layer and Lm slot layer are all lap-wound coils 100a; while the hairpin coil 100 with a cross-layer method of two effective edges 110 crossing Lm-1 slot layer and Lm-1 slot layer are all anti-twist coils 100b.

[0051] It is understood that, according to the layering method of the hairpin coils 100, the hairpin coils 100 are set into two shapes: stacked coil 100a and reverse twisted coil 100b, so that the hairpin coils 100 can be wound on the stator core 500 in a specified layering method to prepare the required stator assembly.

[0052] More specifically, each winding branch also includes a bridge line 200, which connects two hairpin coils 100.

[0053] like Figure 3 and Figure 6 As shown in this embodiment, it is exemplarily illustrated that for each winding branch, during the winding process, when the connection positions of two hairpin coils 100 are far apart, they can also be connected by a bridging wire 200. The bridging wire 200 can be used to connect two lapped coils 100a whose connection positions are far apart, or it can be used to connect two reverse-twisted coils 100b whose connection positions are far apart. The bridging wire 200 can also be integrally formed using flat enameled wire, and it can specifically include a bridging connecting wire 210 and a bridging welding end 220. There can be two bridging welding ends 220, each corresponding to one of the two hairpin coils 100; the two bridging welding ends 220 are respectively located close to one welding end 120 of the two hairpin coils 100 and welded to be connected. The bridging connecting wire 210 can be arc-shaped and extends along the circumference of the stator core 500 to connect the two bridging welding ends 220.

[0054] It is understood that, by setting the bridge line 200 in this embodiment, it is convenient to connect the winding branches when the two hairpin coils 100 are far apart at the connection position, so as to wind the desired odd-even mixed layer winding structure.

[0055] More specifically, all 100a coils with the same cross-layer winding method have the same pitch, and all 100b reverse-twisted coils with the same cross-layer winding method have the same pitch or two different pitches.

[0056] like Figure 3As shown in this embodiment, the pitch of the hairpin coil 100 is exemplarily illustrated as the number of stator slots 510 spaced between its two effective edges 110. It should be noted that when hairpin coils 100 have the same shape, use the same layering method, and have the same pitch, they can be defined as hairpin coils 100 of the same linear type; however, if one of these conditions is not met, they should all be defined as hairpin coils 100 of different linear types. In this embodiment, the hairpin coil 100 has two shapes: a lapped coil 100a and a reverse-twisted coil 100b. The lapped coil 100a has m / 2 layering methods, and among the lapped coils 100a with the same layering method, the lapped coils 100a with the same layering method have the same pitch. Based on this, the lapped coil 100a has m / 2 linear types. The reverse-twisted coil 100b has only one layering method and one or two pitches. Based on this, the anti-twist coil 100b has one or two wire types.

[0057] For example, when m=6, the pitch of the lapped coil 100a spanning slots L1 and L2 can be set to 9 slots, which is the first type of lapped coil 100a; the pitch of the lapped coil 100a spanning slots L3 and L4 can be set to 9 slots, which is the second type of lapped coil 100a; and the pitch of the lapped coil 100a spanning slots L5 and L6 can be set to 9 slots, which is the third type of lapped coil 100a. The pitch of the anti-twisted coil 100b spanning slots L5 and L5 can be set to 9 slots or 10 slots, which are two types of anti-twisted coil 100b respectively; or the pitch of the anti-twisted coil 100b spanning slots L5 and L5 can be set to 9 slots, which is the only type of anti-twisted coil 100b.

[0058] It is understood that in this embodiment, all the lapped coils 100a with the same cross-layer method are set to the same pitch, and the reverse twisted coils 100b with the same cross-layer method are set to one or two pitches. This simplifies the wire type of the hairpin coil 100, thereby making the winding structure less prone to errors during the winding process and improving the winding efficiency of the winding structure.

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

[0060] like Figure 3As shown in this embodiment, by way of example, when Z=54, p=3, m=6, n=2, the odd-even layer winding structure constitutes a three-phase winding structure with 54 slots, 6 poles, 6 layers, and 2 parallel branches. In this winding structure, several hairpin coils 100 include three types of lap-wound coils 100a and two types of anti-twist coils 100b. The three types of lap-wound 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 anti-twist 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 is understandable that this embodiment, by reasonably setting the pitch and layering method of several hairpin coils 100, facilitates the winding of 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, by way of example, the 54 stator slots 510 can be represented by serial numbers "1#" to "54#". The serial numbers "1#" to "54#" are only for the convenience of describing the 54 stator slots 510 and are not intended to limit them. Any stator slot 510 of the stator core 500 can be designated as stator slot 510 with serial number "1#". The serial number can be increased in either a clockwise or counterclockwise direction of the stator core 500, and there is no specific limitation. It should be noted that when the stator slot 510 completes one turn in the direction of increasing number and continues winding, the stator slot 510 numbers are renumbered as "1#" to "54#". For example, when the hairpin coil 100 with a pitch of 9 slots is first wound in the stator slot 510 with the number "51#", it will subsequently be wound across 9 stator slots 510 in the stator slot 510 with the number "51#+9#-54#=6#". The same logic applies when the stator slot 510 completes one turn in the direction of decreasing number.

[0067] like Figure 3 As shown, taking the first winding branch of phase U as an example, in the first winding branch of phase U, the line corresponding to "1#L1-10#L2" is the first hairpin coil 100 of the first winding branch. Its shape is a lapped coil 100a, and its two effective sides 110 are wound on the L1 slot layer of stator slot 510 with the number "1#" and the L2 slot layer of stator slot 510 with the number "10#", respectively, with a pitch of 9 slots. At the same time, it represents that the first winding branch of phase U enters the line from the L1 slot layer of stator slot 510 with the number "1#", as shown in the figure. Figure 3U1 in the middle. The subsequent winding circuit is similar, in which the hairpin coil 100 corresponding to the circuit "3#L5-12#L5" is a reverse twist coil 100b, and its two effective sides 110 are respectively arranged in the L5 slot layer of stator slot 510 with serial number "3#" and the L5 slot layer of stator slot 510 with serial number "12#", with a pitch of 9 slots. The hairpin coil 100 corresponding to line "20#L5-29#L5" is also a reverse-twist coil 100b, with its two effective sides 110 wound on the L5 slot layer of stator slot 510 with serial number "20#" and the L5 slot layer of stator slot 510 with serial number "29#", respectively, with a pitch of 9 slots; Similarly, the hairpin coil 100 corresponding to line "21#L5-11#L5" is also a reverse-twist coil 100b, with its two effective sides 110 wound on the L5 slot layer of stator slot 510 with serial number "21#" and the L5 slot layer of stator slot 510 with serial number "11#", respectively, with a pitch of 10 slots; it also represents the first winding branch of phase U, originating from the L5 slot layer of stator slot 510 with serial number "11", as shown in the reference. Figure 3 X1 in the diagram. Line "10#L1-19#L1" corresponds to bridge line 200, which connects the two lapped coils 100a corresponding to lines "19#L2-10#L1" and "19#L1-28#L2". In this embodiment, line "29#L5-21#L5" also corresponds to bridge line 200, which connects the two anti-twist coils 100b corresponding to lines "20#L5-29#L5" and "21#L5-11#L5".

[0068] The second winding branch of phase U is similar. "38#L5-48#L5" represents the first hairpin coil 100 of the second winding branch, which is a reverse-twisted coil 100b. Its two effective sides 110 are wound on the L5 slot layer of stator slot 510 numbered "38#" and the L5 slot layer of stator slot 510 numbered "48#", with a pitch of 10 slots. Simultaneously, it represents the second winding branch of phase U entering from the L5 slot layer of stator slot 510 numbered "38#", as shown in the reference... Figure 3 In U2, the line “37#L2-28#L1” corresponds to the last hairpin coil 100 of the second winding branch, which is a stacked coil 100a with a pitch of 9 slots; at the same time, it represents the second winding branch of phase U, which is the L1 slot layer output of stator slot 510 with the serial number “28#”, as shown in the reference. Figure 3 X2 in the middle.

[0069] like Figure 2As shown, the winding lines of phases V and W can be obtained by sequentially shifting the winding line of phase U by 6 and 12 stator slots 510 respectively along the direction of increasing stator slot number 510. Based on this, the entry positions of the two winding branches of phase V are 7#L1 and 44#L5 respectively, referring to... Figure 2 V1 and V2; the outgoing lines of the two winding branches of phase V are 17#L5 and 34#L1 respectively, refer to Figure 2 Y1 and Y2 in the middle. The entry points of the two winding branches of phase W are 13#L1 and 50#L5 respectively, referring to... Figure 2 The outgoing lines of the two winding branches of phase W1 and W2 are located at 23#L5 and 40#L1 respectively, as shown in the reference. Figure 2 Z1 and Z2 in the example.

[0070] like Figure 2 As shown, in this embodiment, the odd-even layer winding structure may further include phase copper busbars 300 and star copper busbars 400, wherein the phase copper busbars 300 correspond one-to-one with the three phases of the stator assembly, i.e., there are three phase copper busbars 300. Each phase copper busbar 300 is connected to the input position of the n winding branches of its corresponding phase. For example, in the aforementioned embodiment, the phase copper busbar 300 corresponding to U is connected to U1 and U2. The star copper busbars 400 can correspond to the number of parallel winding branches of any phase, i.e., there are n. Each star copper busbar 400 is connected to the output position of the corresponding winding branches of the three phases. For example, in the aforementioned embodiment, the star copper busbar 400 corresponding to the first winding branch is connected to U1, V1, and W1.

[0071] Of course, in some embodiments, the star copper busbar 400 may be set to only one, which is connected to the output positions of the three phases and a total of 3n winding branches. For example, in the aforementioned embodiment, the star copper busbar 400 is connected to X1, X2, Y1, Y2, Z1 and Z2.

[0072] Specifically, Z=54, p=3, m=6, n=3, and the cross-layer configuration is as follows: two effective edges 110 spanning L1 and L2 slot layers, two effective edges 110 spanning L3 and L4 slot layers, two effective edges 110 spanning L5 and L6 slot layers, and two effective edges 110 spanning L5 and L5 slot layers. The pitch of the hairpin coil 100 is 9 slots.

[0073] like Figure 7As shown in this embodiment, by way of example, when Z=54, p=3, m=6, 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, several hairpin coils 100 include three types of lapped coils 100a and one type of anti-twist coil 100b. The three types of lapped coils 100a are respectively two effective sides 110 spanning slots L1 and L2 with a pitch of 9 slots, two effective sides 110 spanning slots L3 and L4 with a pitch of 9 slots, and two effective sides 110 spanning slots L5 and L6 with a pitch of 9 slots; the only type of anti-twist coil 100b is two effective sides 110 spanning slots L5 and L5 with a pitch of 9 slots.

[0074] It is understandable that this embodiment, by reasonably setting the pitch and layering method of several hairpin coils 100, facilitates the winding of a three-phase winding structure with 54 slots, 6 poles, 6 layers, and 3 branches in parallel.

[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, taking the first winding branch of phase U as an example, in the first winding branch of phase U, the line corresponding to "19#L1-28#L2" is the first hairpin coil 100 of the first winding branch, which is shaped as a lapped coil 100a. Its two effective sides 110 are wound on the L1 slot layer of stator slot 510 with serial number "19#" and the L2 slot layer of stator slot 510 with serial number "28#", respectively, with a pitch of 9 slots. At the same time, it represents that the first winding branch of phase U enters the line from the L1 slot layer of stator slot 510 with serial number "19#", referring to... Figure 7 U1′ in the middle. The subsequent winding circuit is similar, in which the hairpin coil 100 corresponding to the circuit “2#L5-11#L5” is a reverse twist coil 100b, and its two effective sides 110 are respectively arranged in the L5 slot layer of stator slot 510 with serial number “2#” and the L5 slot layer of stator slot 510 with serial number “11#”, with a pitch of 9 slots. The hairpin coil 100 corresponding to line "3#L5-12#L5" is also a reverse-twist coil 100b. Its two effective sides 110 are wound on the L5 slot layer of stator slot 510 with serial number "3#" and the L5 slot layer of stator slot 510 with serial number "12#", respectively, with a pitch of 9 slots. The last hairpin coil 100 corresponding to line "19#L2-10#L1" in the second winding branch is a lap-wound coil 100a. Its two effective sides 110 are wound on the L2 slot layer of stator slot 510 with serial number "19#" and the L1 slot layer of stator slot 510 with serial number "10#", respectively, with a pitch of 9 slots. Simultaneously, it represents the first winding branch of phase U, with the line exiting from the L1 slot layer of stator slot 510 with serial number "10". (Refer to...) Figure 7 X1′ in the middle. Among them, the line “11#L5-3#L5” corresponds to the bridge line 200, which connects the two anti-torsion coils 100b corresponding to the lines “2#L5-11#L5” and “3#L5-12#L5”.

[0082] The second and third winding branches of phase U are similar. The line "19#L1-28#L2" is the first hairpin coil 100 of the second winding branch, which is a lap-wound coil 100a. Its two effective sides 110 are wound on the L1 slot layer of stator slot 510 (number "19#") and the L2 slot layer of stator slot 510 (number "28#"), respectively, with a pitch of 9 slots. Simultaneously, it represents the second winding branch of phase U entering from the L1 slot layer of stator slot 510 (number "19#"). Figure 7 In U2′, “37#L2-28#L1” corresponds to the last hairpin coil 100 of the second winding branch, which is a stacked coil 100a with a pitch of 9 slots; at the same time, it represents the second winding branch of phase U, which is the L1 slot layer output of stator slot 510 with the serial number “28#”, as shown in the reference. Figure 7 X2′ in the diagram. The line “37#L1-46#L2” is the first hairpin coil 100 of the third winding branch, its shape being a lap-wound coil 100a. Its two effective sides 110 are wound on the L1 slot layer of stator slot 510 numbered “37#” and the L2 slot layer of stator slot 510 numbered “46#”, respectively, with a pitch of 9 slots. Simultaneously, it represents the third winding branch of phase U entering from the L1 slot layer of stator slot 510 numbered “37#”, referring to… Figure 7 U3′ in the diagram. The line corresponding to “1#L2-46#L1” is the last hairpin coil 100 of the third winding branch, which is a stacked coil 100a with a pitch of 9 slots; at the same time, it represents the second winding branch of phase U, which is the L1 slot layer output of stator slot 510 with the serial number “46#”, as shown in the reference. Figure 7 X3′ in the middle.

[0083] The winding circuits for 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 can be other parameters. For example, Z = 72, p = 4, m = 4. In this embodiment, the layer-crossing method of the plurality of hairpin coils 100 includes: a stacked coil 100a with two effective sides 110 crossing L1 slot layer and L2 slot layer and two effective sides 110 crossing L3 slot layer and L4 slot layer, and a reverse-twisted coil 100b with two effective sides 110 crossing L5 slot layer and L5 slot layer. Another example is Z = 108, p = 6, m = 8. In this embodiment, the layer-crossing methods of the plurality of hairpin coils 100 include: two effective edges 110 crossing the 1st layer and the 2nd layer, two effective edges 110 crossing the L3 slot layer and the L4 slot layer, two effective edges 110 crossing the L5 slot layer and the L6 slot layer, and two effective edges 110 crossing the L7 slot layer and the L8 slot layer, and a reverse twisted coil 100b with two effective edges 110 crossing the L7 slot layer and the L7 slot layer.

[0085] The implementation principle of the odd-even layer winding structure provided in Embodiment 1 of this application is as follows:

[0086] Stator laminations are stacked to form a stator core 500. Then, several hairpin coils 100 are wound onto the stator core 500 to create 3n winding branches. The hairpin coils 100 have m / 2+1 different layer-crossing configurations: two effective edges 110 crossing slots L1 and L2, two effective edges 110 crossing slots L3 and L4, ..., two effective edges 110 crossing slots Lm-1 and Lm, forming a stacked coil 100a; and two effective edges 110 crossing slots Lm-1 and Lm-1, forming a reverse-twist coil 100b. Finally, phase busbars 300 and star-point busbars 400 are connected to designated positions along the 3n winding branches.

[0087] This application achieves the desired odd-even layer winding structure by configuring several stator slots 510 of the stator core 500 into a mixed slot type of m-1 slot layers and m slot layers, and by rationally setting the combination form and number of several stator slots 510. Simultaneously, by rationally setting the cross-layer arrangement of several hairpin coils 100 in the winding structure, the desired odd-even layer winding structure can be prepared. Verification has shown that, compared to a winding structure in the matching stator core 500 where several stator slots 510 have identical slot types and adopt an even-number layer design, the odd-even layer winding structure provided in this application can effectively improve the motor's peak power, high-efficiency area ratio, and maximum efficiency.

[0088] Example 2

[0089] Embodiment 2 of this application provides a stator assembly, which includes any of the odd-even layer winding structures provided in this application.

[0090] Example 3

[0091] Embodiment 3 of this application provides an electric motor, which includes any of the stator assemblies provided in this application.

[0092] Comparative Example

[0093] This application provides a comparative example of a 54-slot, 6-pole, 6-layer, parallel 2-branch winding structure with identical stator slot 510 slot type, which is used for comparison with the 54-slot, 6-pole, odd-even mixed-layer, parallel 2-branch winding structure in Embodiment 1 of this application.

[0094] Application Example 1

[0095] This application compares the output performance of motors suitable for the two winding structures provided in Embodiment 1 and the comparative example. Under the premise that other parameters such as motor size / material usage are the same, the results are as follows: Figure 8The comparison diagram shows that the solid line represents the data of the motor to which the winding structure provided in Embodiment 1 is suitable, and the dashed line represents the data of the motor to which the winding structure provided in the comparative example is suitable. It is easy to see that Embodiment 1 of this application can increase the peak power of the motor by 12.4%; at the same time, the area ratio of the high-efficiency range of the motor is increased by 1.2%-6.1%, and the maximum efficiency is increased by 0.4%.

[0096] Application Example 2

[0097] This application uses Example 2 to obtain the opposite potential spectrum of the motors suitable for 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 9 and Figure 10 The bar chart shown, in which Figure 9 This indicates the data for the motor to which the winding structure provided by the comparative model is applicable. Figure 10 This indicates the data for the motor to which the winding structure provided in Embodiment 1 is applicable. Figure 9 and Figure 10 In the diagram, the horizontal axis represents the harmonic order, and the vertical axis represents the voltage, with the unit being V. It is easy to see that Embodiment 1 of this application can reduce the proportion of the 3rd / 5th / 7th harmonics, thereby improving motor performance.

[0098] Application Example 3

[0099] This application uses Example 3 to compare the back EMF of the two winding structures provided in Example 1 and the comparative example for motors. Under the premise that other parameters such as motor size / material usage are the same, the results are as follows: Figure 11 The comparison diagram shows that the red line represents the data for the motor to which the winding structure provided in Embodiment 1 is suitable, and the blue line represents the data for the motor to which the winding structure provided in the comparative example is suitable. It is easy to see that Embodiment 1 of this application can optimize the inductance of the motor, thereby improving the sinusoidal nature of the back EMF waveform.

[0100] Application Example 4

[0101] This application uses Example 4 to compare the stator transient temperature curves of motors suitable for 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 results are as follows: Figure 12 The comparison chart shows that the blue line represents the data for the motor to which the winding structure provided in Embodiment 1 is suitable, and the red line represents the data for the motor to which the winding structure provided in the comparative example is suitable. It is easy to see that Embodiment 1 of this application requires lower electrical density / line load and generates less copper loss heat while outputting the same peak power. Specifically, the peak temperature of the winding structure is relatively reduced by 28°C.

[0102] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An odd-even layer winding structure, characterized in that, The odd-even layer winding structure is applicable to a stator assembly, the stator assembly having 2p poles, and the stator assembly also including a stator core (500). The stator core (500) has Z stator slots (510) evenly spaced along the circumference, where Z = 18p. Within the Z stator slots (510), every three stator slots (510) form a group. In the same group of stator slots (510), the two stator slots (510) located on the left and in the middle are sequentially provided with slot layers L1, L2...Lm-1, and the stator slot (510) located on the right is sequentially provided with slot layers L1, L2...Lm, where m is an even number not less than 4. The odd-even layer winding structure includes winding lines for three phases: U, V, and W. The winding lines for phases V and W are sequentially shifted by Z / 3p and 2Z / 3p positions from the winding branch of phase U. The stator slots (510) are obtained such that the winding lines of each phase are completely wound in the three stator slots (510) forming the same group, and are evenly spaced by six stator slots (510); the winding lines of each phase include n parallel winding branches, each winding branch includes several hairpin coils (100), the hairpin coils (100) include two spaced effective sides (110), the effective sides (110) are set In one of the slot layers of the stator slot (510); wherein the hairpin coil (100) is provided with m / 2+1 cross-layer methods: two effective edges (110) cross L1 slot layer and L2 slot layer, two effective edges (110) cross L3 slot layer and L4 slot layer... two effective edges (110) cross Lm-1 slot layer and Lm slot layer, and two effective edges (110) cross Lm-1 slot layer and Lm-1 slot layer.

2. The odd-even layer winding structure according to claim 1, characterized in that, The hairpin coil (100) further includes a soldering end (120) and a hairpin end (130). Two soldering ends (120) are provided, each located at the same end of one of the two effective sides (110). The hairpin end (130) connects to the other end of the two effective sides (110). The hairpin coil (100) can be of two types: a lapped coil (100a) and a reverse-twisted coil (100b). The two soldering ends (120) of the lapped coil (100a) extend in a direction that approaches each other. The two welding ends (120) of the twisted coil (100b) extend in the same direction. The cross-layer method 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, and so on. The hairpin coils (100) that cross the Lm-1 slot layer and the Lm slot layer with the two effective edges (110) are all the stacked coils (100a). The hairpin coils (100) that cross the Lm-1 slot layer and the Lm-1 slot layer with the two effective edges (110) are all the reverse twisted coils (100b).

3. The odd-even layer winding structure according to claim 2, characterized in that, Each winding branch also includes a bridge wire (200) that connects the two hairpin coils (100).

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

5. The odd-even layer winding structure according to claim 4, characterized in that, Z=54, p=3, m=6, n=2, the pitch of the hairpin coil (100) with two effective edges (110) spanning L1 slot layer and L2 slot layer, two effective edges (110) spanning L3 slot layer and L4 slot layer, and two effective edges (110) spanning L5 slot layer and L6 slot layer is 9 slots, and the pitch of the hairpin coil (100) with two effective edges (110) spanning L5 slot layer and L5 slot layer is 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, 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 two effective edges (110) cross the L5 slot layer and the L6 slot layer, and the two effective edges (110) cross the L5 slot layer and the L5 slot layer. 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 one of claims 1-8.

10. An electric motor, characterized in that, The motor includes the stator assembly as described in claim 9.

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