Mixing tank layer number stator winding, stator assembly and motor

Abstract

The application relates to a hybrid slot layer number stator winding, a stator assembly and a motor. The pole number of the stator assembly is 2p, and the core member is provided with Z conductor slots; every two conductor slots form a group, the conductor slots on the left side are sequentially provided with L1, L2,..., Lm-1 slot layers, and the conductor slots on the right side are sequentially provided with L1, L2,..., Lm slot layers; the hybrid slot layer number stator winding 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 kinds of cross-layer modes: cross L1 slot layer and L2 slot layer, cross L3 slot layer and L4 slot layer,..., cross Lm-1 slot layer and Lm slot layer, and cross Lm-1 slot layer and Lm-1 slot layer. The odd-even layer stator winding provided by the application can effectively reduce the required current density / line load of the stator assembly, so as to reduce the copper loss, further reduce the temperature of the stator assembly, and avoid the adverse effect on the heat dissipation of the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a mixed-slot stator winding, stator assembly, and motor. Background Technology

[0002] An electric motor can include a stator assembly and a rotor assembly. The stator assembly is fixed within the motor housing, while the rotor assembly is rotatably mounted within the motor housing. When the rotor assembly rotates, it can generate electromagnetic induction with the stator assembly, thereby converting mechanical energy into electrical energy. Electric motors can be used as power systems in new energy vehicles, such as generators and electric motors. When an electric motor is used in a new energy vehicle, its stator assembly typically includes a core and three-phase stator windings wound on the core. For existing stator assemblies, the conductor slots on the core typically employ the same slot design and are used to arrange the same layer of effective edges; the stator windings are usually configured with a fixed even-number of layers. In this structure, the required electrical density / line load of the stator assembly is relatively high, and the copper loss heat generation is relatively high, resulting in a high temperature for the stator assembly, which is detrimental to the motor's heat dissipation. Summary of the Invention

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

[0004] In a first aspect, this application provides a mixed-slot-layer stator winding, which is used in a stator assembly. The stator assembly has 2p poles and includes a core component. The core component has Z conductor slots evenly spaced along its circumference, where Z = 12p. In the Z conductor slots, every two conductor slots form a group. In the same group, the left-hand conductor slot has L1, L2...Lm-1 slot layers sequentially, and the right-hand conductor slot has L1, L2...Lm slot layers sequentially, where m is an even number not less than 4. The mixed-slot-layer stator winding includes three phase windings: U, V, and W. The windings of the V and W phases are derived from the windings of the U phase. The branch is sequentially shifted by Z / 3p and 2Z / 3p conductor slots to obtain the winding circuit of each phase. The winding circuit of each phase is completely wound in the two conductor slots that constitute the same group and are evenly spaced by four conductor slots. The winding circuit of each phase includes n parallel winding branches. Each winding branch includes several hairpin coils. The hairpin coil includes two spaced effective sides. The effective sides are located in one of the slot layers of the conductor slot. The hairpin coil is provided 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 further includes a bridging wire that connects two of the hairpin coils, both of which are the lapped coils.

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

[0008] In one embodiment, Z = 48, p = 4, m = 6, n = 2 or 4, and the cross-layer method is that the pitch of the hairpin 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 6 slots.

[0009] In one embodiment, any winding branch enters through the L1 slot layer of the conductor groove and exits through the L1 slot layer of the conductor groove.

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

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

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

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

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

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

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

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

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

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

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

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

[0022] Secondly, this application provides a stator assembly, which includes any of the mixed slot layer stator windings provided in this application.

[0023] Thirdly, this application provides an electric motor, which includes any of the stator assemblies provided in this application.

[0024] This application achieves the desired odd-even layer stator winding by configuring several conductor slots of the core component 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 conductor slots. Simultaneously, by rationally setting the cross-layer arrangement of several hairpin coils in the stator winding, the required odd-even layer stator winding can be fabricated. Verification has shown that, compared to a stator winding with identical slot types in the matching core component and an even-numbered layer design, the odd-even layer stator winding provided in this application can effectively reduce the required electrical density / line load of the stator assembly, thereby reducing copper losses and lowering the temperature of the stator assembly, thus avoiding adverse effects on motor heat dissipation. Attached Figure Description

[0025] Figure 1 A schematic diagram of a mixed-slot layer stator winding wound on an iron core according to an embodiment of this application;

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

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

[0028] Figure 4 This is a schematic diagram of the structure of the lapped coil of the mixed slot layer stator winding provided in Embodiment 1 of this application;

[0029] Figure 5 This is a schematic diagram of the anti-torsion coil of the mixed-slot layer stator winding provided in Embodiment 1 of this application;

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

[0031] Figure 7 This is a schematic diagram of the bridge wire structure of the mixed-slot layer stator winding provided in Embodiment 1 of this application;

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

[0033] Figure 9 A comparison chart of the output performance of Example 1 and the comparative example provided for Example 2 of this application;

[0034] Figure 10 The opposite potential spectrum diagram of the comparative example provided in Embodiment 2 of this application;

[0035] Figure 11The opposite potential spectrum diagram of Embodiment 1 provided for Application Embodiment 3 of this application;

[0036] Figure 12 A comparison diagram of the back potential of Embodiment 1 and the comparative example provided for the application embodiment 4 of this application.

[0037] Reference numerals: 100, hairpin coil; 100a, lapped coil; 100b, reverse twisted coil; 110, effective edge; 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, iron core component; 510, conductor groove. Detailed Implementation

[0038] 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.

[0039] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention.

[0040] 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.

[0041] 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.

[0042] Example 1

[0043] Embodiment 1 of this application provides a mixed-slot layer stator winding, such as... Figures 1 to 7As shown, the mixed-slot-layer stator winding is used in the stator assembly, which has 2p poles. The stator assembly also includes a core 500, which has Z conductor slots 510 spaced equally along the circumference, where Z = 12p. In the Z conductor slots 510, every two slots form a group. In the same group, the left-hand slot 510 has L1, L2...Lm-1 slot layers arranged sequentially, and the right-hand slot 510 has L1, L2...Lm slot layers arranged sequentially, where m is an even number not less than 4. The mixed-slot-layer stator winding includes three phases of winding lines: U, V, and W. The V-phase and W-phase winding lines are shifted sequentially by Z / 3p and 2Z / 3p conductors from the U-phase winding branch, respectively. The slot 510 is obtained such that the winding circuit of each phase is completely wound in the two conductor slots 510 that constitute the same group, and is evenly spaced by 4 conductor slots 510; the winding circuit of each phase includes n parallel winding branches, each winding branch includes several hairpin coils 100, and the hairpin coil 100 includes two spaced effective edges 110, which are set in one of the slot layers of the conductor slot 510; wherein, the hairpin coil 100 is provided with m / 2+1 cross-layer methods: 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 Lm-1 slot layer and the Lm slot layer, and the two effective edges 110 cross the Lm-1 slot layer and the Lm-1 slot layer.

[0044] like Figure 1As shown in this embodiment, the stator assembly may include p pairs of magnetic poles, where the number of poles is 2p, or the number of pole pairs is p, where p is a positive integer. The stator assembly may specifically include a core 500 and a stator winding. The core 500 may be composed of several laminations, which may be fabricated using a lamination process. The core 500 may be a hollow cylindrical structure, and conductor slots 510 may be located inside the core 500. The conductor slots 510 may have Z slots evenly spaced circumferentially, where Z may be 12p. The conductor slots 510 may be used to arrange conductors wound into the stator winding. Depending on the position of the conductors within the conductor slots 510, the conductor slots 510 may be divided into several slot layers along the radial direction of the core 500, and each slot layer of the conductor slots 510 is used to arrange one layer of conductors. In this embodiment, the number of slot layers in the conductor groove 510 is m-1 or m, where m is an even number not less than 4. The m-1 or m slot layers can be represented sequentially as L1, L2...Lm-1 or Lm. It should be noted that the designation "Lm" is only for ease of description and is not intended to limit the slot layer in any way. In some embodiments, several slot layers of the conductor groove 510 can also be represented by other designations. Along the radial direction of the core member 500, the L1...Lm-1 and Lm slot layers of the conductor groove 510 are arranged sequentially from the inside out. It is easy to see that the conductor groove 510 with m slot layers must have a longer length than the conductor groove 510 with m-1 slot layers. In the aforementioned Z conductor grooves 510, every two conductor grooves 510 are set as a group; in this embodiment, Z / 2 groups of conductor grooves 510 are provided. In the same group of conductor slots 510, a conductor slot 510 located on the left side has m-1 slot layers, while a conductor slot 510 located on the right side has m slot layers. The aforementioned left and right positions can be the relative positions of the two conductor slots 510 in the same group when viewed from above at the end of the core 500. In some embodiments, the left and right positions can be adaptively interchanged.

[0045] like Figure 1 and Figure 2As shown, the stator assembly can have three phases, suitable for three-phase motors, and the three phases can be phase U, phase V, and phase W. The designations "U", "V", and "W" are merely for ease of description of the three phases of the stator assembly and are not intended to limit them in any way. 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 stator windings correspondingly include winding branches for three phases, namely the winding lines for phases U, V, and W. For any phase winding branch, it is completely wound within two consecutive conductor slots 510, and these two conductor slots 510 are in the same group. Simultaneously, the winding lines of any phase are equally spaced four conductor slots 510 apart. Furthermore, the winding lines of phase V and phase W can be obtained by shifting the winding lines of phase U by Z / 3p = 4 and 2Z / 3p = 8 conductor slots 510, respectively. Under this structure, the winding lines of phase U, phase V and phase W can be arranged in a staggered manner without overlapping or interference, and the winding lines of phase U, phase V and phase W can fill Z conductor slots 510.

[0046] like Figure 3 As shown, in this embodiment, the winding circuit of any phase also includes n winding branches, where n is a positive integer not less than 2, and the n winding branches are connected in parallel. n can be set to different values ​​according to actual needs, such as n=2 or 4, 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 made of conductors, such as flat enameled wire, and the motor can be called a flat wire motor, which has a relatively high slot fill factor. During winding, the hairpin coils 100 can be wound on the iron core 500 by using a slot, and the hairpin coils 100 are at least partially wound in the conductor slots 510. The part of the hairpin coils 100 wound in the conductor slots 510 can be called its effective edge 110. In this embodiment, each of the hairpin coils 100 is provided with two effective edges 110, the two effective edges 110 are spaced apart, and are respectively provided in one slot layer of a conductor slot 510. In this structure, the hairpin coil 100 has a U-shaped shape and can therefore be called a U-shaped wire.

[0047] 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.

[0048] It is understood that this application can prepare the required odd-even layer stator winding by setting a number of conductor slots 510 of the core component 500 as a mixed slot type of m-1 slot layers and m slot layers, and by reasonably setting the combination form and number of the conductor slots 510, and by reasonably setting the cross-layer method of the hairpin coils 100 of the stator winding. Verification has shown that, compared to the stator winding with the same slot type of the conductor slots 510 of the matching core component 500 and an even-number layer design, the odd-even layer stator winding provided by this application can effectively reduce the required electrical density / line load of the stator assembly, thereby reducing copper losses, and thus reducing the temperature of the stator assembly, avoiding adverse effects on the heat dissipation of the motor.

[0049] Specifically, the hairpin coil 100 also includes a soldering end 120 and a hairpin end 130. There are two soldering 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 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, and the two soldering 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.

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

[0051] Each hairpin coil 100 in any winding branch is configured with two shapes: a lapped coil 100a and a reverse-twisted coil 100b. When the hairpin coil 100 is a lapped coil 100a, its two welding ends 120 extend obliquely in a direction close to each other, forming 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 a lapped 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 lapped coils 100a can be adjacent and connected, and the two lapped coils 100a are connected through one of their welding ends 120, which can be welded and fixed. Alternatively, a lapped coil 100a can be connected to a reverse twisted coil 100b. In this case, a welding end 120 of the lapped coil 100a is connected to a welding end 120 of the reverse twisted coil 100b, and the connection method can also be welding.

[0052] In this embodiment, when the layer crossing method of the hairpin coil 100 is specified, its shape is also specified. Specifically, hairpin coils 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 hairpin coils 100 with two effective edges 110 crossing Lm-1 slot layer and Lm-1 slot layer are all anti-twist coils 100b.

[0053] 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 iron core 500 in a specified layering method to prepare the required stator assembly.

[0054] More specifically, each winding branch also includes a bridge line 200, which connects two hairpin coils 100, both of which are stacked coils 100a.

[0055] like Figure 6 and Figure 7 As shown in this embodiment, it is exemplarily illustrated that for any winding branch, if the connection positions of two hairpin coils 100 are far apart during the winding process, that is, if the welding ends 120 used to connect the two hairpin coils 100 are far apart, the two hairpin coils 100 can also be connected by a bridging wire 200. It should be noted that the bridging wire 200 in this embodiment can be used to connect two overlapping coils 100a whose connection positions are far apart. The bridging wire 200 can also be integrally formed using flat enameled wire, specifically including a bridging connecting wire 210 and a bridging welding end 220. Two bridging welding ends 220 can be provided, each corresponding to one of the two overlapping coils 100a; the two bridging welding ends 220 are respectively located close to one welding end 120 of the two overlapping coils 100a and welded in place for connection. The bridge connecting line 210 can be set to be arc-shaped and extend along the circumference of the iron core 500 to connect the two bridge welding ends 220.

[0056] It is understood that, by setting the bridge line 200 in this embodiment, the winding branch can be connected when the two hairpin coils 100 are far apart at the connection position, so as to wind the stator winding with the required number of mixed slot layers.

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

[0058] like Figure 3 and Figure 6 As shown in this embodiment, the pitch of the hairpin coil 100 is exemplarily illustrated as the number of conductor 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 line type; however, if one of these conditions is not met, they should all be defined as hairpin coils 100 of different line 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. Under this structure, the lapped coil 100a has m / 2 line types. The reverse-twisted coil 100b has only one layering method and only one pitch. In this structure, the anti-torsion coil 100b also has only one type of line.

[0059] For example, when m=6, the pitch of the lapped coil 100a spanning slots L1 and L2 can be set to 6 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 6 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 6 slots, which is the third type of lapped coil 100a. However, the pitch of the anti-twist coil 100b spanning slots L5 and L5 can be set to 6 slots, which is the only type of anti-twist coil 100b.

[0060] It is understood that in this embodiment, all hairpin coils 100 with the same shape and the same layering method are set to the same pitch, which can simplify the types of wires of hairpin coils 100, thereby making it less likely for errors to occur during the winding of the stator winding, and at the same time improving the winding efficiency of the stator winding.

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

[0062] like Figure 3 and Figure 6 As shown in this embodiment, it is exemplarily illustrated that when Z=48, p=4, m=6, n=2 or 4, the odd-even layer stator windings constitute a three-phase stator winding with 48 slots, 8 poles, 6 layers, and 2 or 4 parallel branches. In this stator winding, 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 6 slots, two effective sides 110 spanning slots L3 and L4 with a pitch of 6 slots, and two effective sides 110 spanning slots L5 and L6 with a pitch of 6 slots; the one type of anti-twist coil 100b has two effective sides 110 spanning slots L5 and L5 with a pitch of 6 slots.

[0063] It is understandable that this embodiment, by reasonably setting the pitch and layering of several hairpin coils 100, facilitates the winding of a three-phase stator winding with 54 slots, 6 poles, 6 layers, and 2 or 4 parallel branches.

[0064] More specifically, each winding branch enters through the L1 slot layer of the conductor slot 510 and exits through the L1 slot layer of the conductor slot 510.

[0065] like Figure 3 and Figure 6 As shown in this embodiment, by way of example, the L1 slot layer of the conductor slot 510 is the slot layer of the conductor slot 510 closest to the axis of the iron core 500, and it is located at the innermost side of the conductor slot 510. For any winding branch, there are entry and exit positions during the winding process, that is, the starting position and the ending position of the winding. In this embodiment, the winding branches all enter from the innermost side of the conductor slot 510 and exit from the innermost side of the conductor slot 510, that is, the entry and exit positions are both set as the L1 slot layer of the conductor slot 510.

[0066] It is understood that by reasonably setting the input and output positions of any winding branch, this embodiment facilitates the connection of the input and output positions of the three phase winding lines with the phase copper busbar 300 and the star copper busbar 400 when the three phase winding lines are subsequently introduced and led out.

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

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

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

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

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

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

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

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

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

[0076] 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 lines corresponding to "1#L1-7#L2" are the first hairpin coil 100 of the first winding branch. Its shape is a lap-wound coil 100a, and its two effective sides 110 are wound on the L1 slot layer of conductor slot 510 with the number "1#" and the L2 slot layer of conductor slot 510 with the number "7#", respectively, with a pitch of 6 slots. At the same time, it represents that the first winding branch of phase U enters the line from the L1 slot layer of conductor slot 510 with the number "1#", as shown in the figure. Figure 3The U1 in the circuit. The subsequent winding circuits are similar. The hairpin coil 100 corresponding to the circuit "2#L5-8#L5" is a reverse-twist coil 100b, with its two effective sides 110 arranged in the L5 slot layer of conductor slot 510 numbered "2#" and the L5 slot layer of conductor slot 510 numbered "8#", respectively, with a pitch of 6 slots. The circuit "13#L2-7#L1" corresponds to the last hairpin coil 100 of the first winding branch, which is a lap-wound coil 100a. Its two effective sides 110 are wound in the L2 slot layer of conductor slot 510 numbered "13#" and the L1 slot layer of conductor slot 510 numbered "7#", respectively, with a pitch of 6 slots. Simultaneously, it represents the first winding branch of phase U originating from the L1 slot layer of conductor slot 510 numbered "7", referring to... Figure 3 X1 in the diagram. It is not difficult to see that the first bypass branch of phase U does not include the bridge line 200.

[0077] The second, third, and fourth winding branches of phase U are similar. "13#L1-19#L2" refers to the first hairpin coil 100 of the second winding branch, which is a stacked coil 100a. It represents the second winding branch of phase U entering through slot L1 of conductor slot 510, numbered "13#". (Refer to...) Figure 3 In U2, the line corresponding to “25#L2-19#L1” is the last hairpin coil 100 of the second winding branch. Its shape is a lapped coil 100a, representing the second winding branch of phase U, which is the L1 slot layer exit line of conductor slot 510 with serial number “19#”. (Refer to...) Figure 3 X2 in the middle.

[0078] Among them, "25#L1-31#L2" refers to the first hairpin coil 100 of the third winding branch, which is a stacked coil 100a. It represents the third winding branch of phase U, which is the L1 slot layer entry line of conductor slot 510 with the serial number "25#". (Refer to...) Figure 3 In U3, the line corresponding to “37#L2-31#L1” is the last hairpin coil 100 of the third winding branch. Its shape is a lap-wound coil 100a, representing the third winding branch of phase U, which is the L1 slot layer output from conductor slot 510 with serial number “31#”. (Refer to...) Figure 3 X3 in the middle.

[0079] Among them, "37#L1-43#L2" refers to the first hairpin coil 100 of the fourth winding branch, which is a stacked coil 100a. It represents the fourth winding branch of phase U, which is the L1 slot layer entry line of conductor slot 510 with the serial number "37#". (Refer to...) Figure 3In U4, the line corresponding to “1#L2-43#L1” is the last hairpin coil 100 of the fourth winding branch. Its shape is a stacked coil 100a, which represents the fourth winding branch of phase U, which is the L1 slot layer output of conductor slot 510 with the serial number “43#”. (Refer to...) Figure 3 X4 in the middle.

[0080] It is not difficult to see that the input and output positions of the first winding branch of phase U are the L1 slot layer of conductor slot 510 with serial number "1#" and the L1 slot layer of conductor slot 510 with serial number "7#", respectively. The input and output positions of the second winding branch of phase U are the L1 slot layer of conductor slot 510 with serial number "13#" and the L1 slot layer of conductor slot 510 with serial number "19#", respectively. The input and output positions of the third winding branch of phase U are... The L1 slot layers of conductor slot 510 with serial number "25#" and "31#" are respectively the L1 slot layers of conductor slot 510. The entry and exit positions of the fourth winding branch of phase U are the L1 slot layers of conductor slot 510 with serial number "37#" and "43#" respectively; that is, any winding branch of phase U enters through the L1 slot layer of conductor slot 510 and exits through the L1 slot layer of conductor slot 510.

[0081] like Figure 2 As shown, the winding lines of phases V and W can be obtained by sequentially shifting the winding line of phase U by 4 and 8 conductor slots 510 along the direction of increasing conductor slot number 510, respectively. Based on this, the entry positions of the four winding branches of phase V are 5#L1, 17#L1, 29#L1, and 41#L1, respectively, referring to... Figure 2 V1, V2, V3, and V4; the outgoing lines of the four winding branches of phase V are 11#L1, 23#L1, 35#L1, and 47#L1, respectively, refer to... Figure 2 Y1, Y2, Y3, and Y4 in the diagram. The entry points for the four winding branches of phase W are 9#L1, 21#L1, 33#L1, and 45#L1, respectively. (Refer to...) Figure 2 The outgoing lines of the four winding branches of phase W1, W2, W3, and W4 are 15#L1, 27#L1, 39#L1, and 3#L1, respectively, refer to... Figure 2 Z1, Z2, Z3 and Z4 in the example.

[0082] like Figure 2As shown, in this embodiment, the odd-even layer stator winding 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, U2, U3, and U4. 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.

[0083] 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, X3, X4, Y1, Y2, Y3, Y4, Z1, Z2, Z3 and Z4.

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

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

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

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

[0088] like Figure 6 As shown in this embodiment, which is an exemplary description, it is not difficult to see that... Figure 6 The stator windings of the two parallel branches in the middle can be made by Figure 3 The result is obtained by deforming the stator windings of the parallel four branches in the middle, specifically it can be Figure 3 In the parallel four-branch stator winding, X1 and U1 are connected by a bridge line 200, and Figure 3 In the parallel four-branch stator winding, X3 and U4 are connected by a bridge line 200 to enable... Figure 3 The first and second winding branches of the parallel four-branch stator winding are connected in series to form Figure 6 The first winding branch of the stator winding in the parallel two-branch configuration, and Figure 3 The third and fourth winding branches of the parallel four-branch stator winding are connected in series to form Figure 6 The second winding branch of the stator winding with two parallel branches. In both types of stator windings, the hairpin coil 100 can have the same wire profile.

[0089] like Figure 6 As shown, in this embodiment, the first winding branch of phase U is taken as an example. The lines corresponding to "1#L1-7#L2" are the first hairpin coil 100, which is a lap-wound coil 100a. Its two effective sides 110 are wound on the L1 slot layer of conductor slot 510 numbered "1#" and the L2 slot layer of conductor slot 510 numbered "7#", respectively, with a pitch of 6 slots. Simultaneously, it represents the first winding branch of phase U entering the circuit from the L1 slot layer of conductor slot 510 numbered "1#", referring to the 6 slots. Figure 6U1′ in the diagram. The subsequent winding lines are similar. The line corresponding to “7#L1-13#L1” is the bridge line 200, connecting the two lapped coils 100a represented by the lines corresponding to “13#L2-7#L1” and “13#L1-19#L2”. The line corresponding to “25#L2-19#L1” is the last hairpin coil 100, also a lapped coil 100a. Its two effective edges 110 are wound on the L2 slot layer of conductor slot 510 (number “25#”) and the L1 slot layer of conductor slot 510 (number “19#”), with a pitch of 6 slots. Simultaneously, it represents the first winding branch of phase U, exiting from the L1 slot layer of conductor slot 510 (number “19#”). (Refer to...) Figure 6 X1′ in the middle.

[0090] The second winding branch of phase U is similar. The line corresponding to "25#L1-31#L2" is the first lapped coil 100a of the second winding branch, with a pitch of 6 slots; simultaneously, it represents the second winding branch of phase U as the L1 slot layer entry line of conductor slot 510510 with serial number "25#", referring to... Figure 6 U2′ in the diagram. The line corresponding to “1#L2-43#L1” is the last lapped coil 100a of the second winding branch, with a pitch of 6 slots; at the same time, it represents the second winding branch of phase U, with the L1 slot layer output from conductor slot 510 numbered “43#”, as shown in the reference diagram. Figure 6 X2′ in the middle.

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

[0092] Of course, in other embodiments, Z, p, and m can be other parameters. For example, Z = 72, p = 6, 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 = 96, p = 8, m = 8. 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, two effective sides 110 crossing L3 slot layer and L4 slot layer, two effective sides 110 crossing L5 slot layer and L6 slot layer and two effective sides 110 crossing L7 slot layer and L8 slot layer, and a reverse twisted coil 100b with two effective sides 110 crossing L7 slot layer and L7 slot layer.

[0093] The implementation principle of a mixed-slot layer stator winding provided in Embodiment 1 of this application is as follows:

[0094] Laminations are stacked to form a core 500, and then several hairpin coils 100 are wound on the core 500 to obtain 3n winding branches. The hairpin coils 100 have m / 2+1 different layer crossing methods: 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-twisted coil 100b. Subsequently, phase copper busbars 300 and star-point copper busbars 400 are connected to designated positions in the 3n winding branches.

[0095] This application achieves the desired odd-even layer stator winding by configuring several conductor slots 510 of the core component 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 conductor slots 510. Simultaneously, by rationally setting the cross-layer arrangement of several hairpin coils 100 in the stator winding, the desired odd-even layer stator winding can be fabricated. Verification has shown that, compared to a stator winding with identical slot types for several conductor slots 510 of the matching core component 500 and an even-numbered layer design, the odd-even layer stator winding provided by this application can effectively reduce the required electrical density / line load of the stator assembly, thereby reducing copper losses and lowering the temperature of the stator assembly, thus avoiding adverse effects on motor heat dissipation.

[0096] Example 2

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

[0098] Example 3

[0099] Embodiment 3 of this application provides an electric motor, which includes any of the stator components provided in this application.

[0100] Comparative Example

[0101] This application provides a stator winding with 54 slots, 6 poles, 6 layers, and 2 parallel branches, which has the same slot type as the conductor slot 510510, for comparison with the stator winding with 54 slots, 6 poles, and 2 parallel branches in Embodiment 1 of this application.

[0102] Application Example 1

[0103] This application compares the stator transient temperature curves of motors suitable for the two stator windings 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 chart shows that the blue line represents the data for the motor to which the stator winding provided in Embodiment 1 is suitable, and the red line represents the data for the motor to which the stator winding 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 lower copper loss heat generation while outputting the same peak power. Specifically, the peak temperature of the stator winding is relatively reduced by 26°C.

[0104] Application Example 2

[0105] This application uses Example 2 to compare the output performance of motors suitable for the two stator windings 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 9 The comparison chart shows that the solid line represents the data of the motor to which the stator winding provided in Embodiment 1 is applicable, and the dashed line represents the data of the motor to which the stator winding provided in the comparative example is applicable. It is easy to see that Embodiment 1 of this application can increase the peak power of the motor by 9.2%; at the same time, the area ratio of the high-efficiency range of the motor is increased by 2.3%-5.6%, and the maximum efficiency is increased by 0.3%.

[0106] Application Example 3

[0107] This application uses Example 3 to obtain the opposite potential spectrum of the motors suitable for the two stator windings 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: Figure 10 and Figure 11 The bar chart shown, in which Figure 10 This indicates the data for the motor to which the stator winding provided by the proportional converter is applicable. Figure 11 This indicates the data for the motor to which the stator winding provided in Embodiment 1 is applicable. Figure 10 and Figure 11 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.

[0108] Application Example 4

[0109] This application uses Example 4 to compare the back EMF of the two stator windings 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 12 The comparison diagram shows that the red line represents the data for the motor to which the stator winding provided in Embodiment 1 is suitable, and the blue line represents the data for the motor to which the stator winding 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.

[0110] 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.

[0111] 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. A stator winding with mixed slot layers, characterized in that, The mixed-slot layer stator winding is used for a stator assembly, the stator assembly has 2p poles, and the stator assembly also includes a core component (500). The core component (500) is provided with Z conductor slots (510) at equal intervals along the circumference, where Z=12p. In the Z conductor slots (510), every two conductor slots (510) form a group. In the same group of conductor slots (510), the conductor slot (510) on the left side is provided with L1, L2...L(m-1) slot layers in sequence, and the conductor slot (510) on the right side... One of the conductor slots (510) is provided with slot layers L1, L2...Lm in sequence, where m is an even number not less than 4; the stator winding with mixed slot layers includes three phase winding lines of U, V and W. The winding lines of the V phase and the W phase are obtained by sequentially shifting the winding branch of the U phase by Z / 3p and 2Z / 3p conductor slots (510) respectively. The winding line of each phase is completely wound in two conductor slots (510) that constitute the same group, and are evenly spaced by 4 conductor slots (510). Each phase winding circuit includes n parallel winding branches, and each winding branch includes several hairpin coils (100). Each hairpin coil (100) includes two spaced effective sides (110). The effective sides (110) are located in one of the slot layers of the conductor slot (510). The hairpin coil (100) has m / 2+1 cross-layer configurations: 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 L(m-1) slot layer and the Lm slot layer, and the two effective sides (110) cross the L(m-1) slot layer and the L(m-1) slot layer.

2. The mixed-slot layer stator winding 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) has 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 reverse-twisted coil... The two welding ends (120) of (100b) extend in the same direction. 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) that crosses the L(m-1) slot layer and the Lm slot layer with the two effective edges (110) are all the stacked coil (100a). The hairpin coil (100) that crosses the L(m-1) slot layer and the L(m-1) slot layer with the two effective edges (110) are all the reverse twisted coil (100b).

3. The mixed-slot layer stator winding according to claim 2, characterized in that, Each winding branch also includes a bridge wire (200) that connects two hairpin coils (100), both of which are the lapped coils (100a).

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

5. The mixed-slot layer stator winding according to claim 4, characterized in that, Z=48, p=4, m=6, n=2 or 4, 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 6 slots.

6. The mixed-slot layer stator winding according to claim 5, characterized in that, Each winding branch enters through the L1 groove layer of the conductor groove (510) and exits through the L1 groove layer of the conductor groove (510).

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

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

9. A stator assembly, characterized in that, The stator assembly includes a mixed-slot layer stator winding 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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