Flat wire motor stator, flat wire motor and vehicle

Abstract

The invention provides a flat wire motor stator, a flat wire motor and a vehicle, and relates to the technical field of vehicles, the flat wire motor stator comprises a stator core and a stator winding, the inner wall of the stator core is provided with a plurality of stator slots along the circumferential direction, each stator slot is internally provided with M slot layers along the radial direction of the stator core, the flat wire motor stator is used for a flat wire motor with the number of stator slots being N and the number of pole pairs being P; the stator winding comprises a plurality of phase windings, each phase winding comprises a plurality of branches connected in parallel, each branch is formed by connecting a plurality of different-layer hairpin coils in series, the different-layer hairpin coils are arranged between two adjacent groove layers in a spanning mode at the span N / P-1, and the span between two adjacent different-layer hairpin coils in the current direction is N / P + 1. Therefore, the stator winding does not have the same layer of coils at the crown end and the span is short, and the radial and axial sizes of the crown end can be reduced, so that the copper consumption and resistance of the winding are reduced, the production cost is saved, and the motor efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a flat wire motor stator, a flat wire motor and a vehicle. Background Art

[0002] Winding stators can be divided into round wire and flat wire. The difference between flat wire motors and round wire motors lies in the way the copper wire is formed. Flat wire is conducive to improving the slot fill rate of the motor. Generally, the slot fill rate of round wire motors is about 50%, while the slot fill rate of flat wire motors can reach more than 70%. The improvement of the slot fill rate means that more copper can be filled under the premise of unchanged space, which reduces the resistance of the motor and reduces the copper loss at the same current. Since flat wire motors can significantly improve the slot fill rate and motor efficiency of motors, more and more flat wire motors are used in new energy vehicle drive systems.

[0003] However, the existing flat wire stator winding usually adopts full-pitch wave winding, which easily occupies a large amount of radial and axial space at the end of the winding, increases the winding cost and resistance, and limits the improvement of motor efficiency. In addition, the design method of the flat wire stator winding is not flexible enough, has poor adaptability, and is difficult to adapt to parallel branches with different numbers of branches, which has certain limitations. Summary of the invention

[0004] The problem solved by the invention is: how to reduce the end size of the flat wire winding and improve the motor efficiency.

[0005] In order to solve the above problems, the present invention provides a flat wire motor stator, a flat wire motor and a vehicle.

[0006] In a first aspect, the present invention provides a flat wire motor stator, comprising a stator core and a stator winding, wherein the inner wall of the stator core is provided with a plurality of stator slots along the circumferential direction, and each of the stator slots is provided with M slot layers for wiring the stator winding along the radial direction of the stator core, and the flat wire motor stator is used for a flat wire motor having N stator slots and P pole pairs, wherein M is an even number greater than or equal to 4;

[0007] The stator winding includes a multi-phase winding, each phase of the winding includes a plurality of parallel branches, each of the branches is formed by a plurality of different-layer hairpin coils connected in series, the different-layer hairpin coils are arranged between two adjacent slot layers with a span of m, and the span between two adjacent different-layer hairpin coils in the current direction is n, wherein m=N / P-1, n=N / P+1.

[0008] Optionally, the branch includes two first winding units and second winding units connected in series, and the first winding unit and the second winding unit each include L different-layer hairpin coils connected in series, the first winding unit is introduced from the Mth layer of the stator slot, and is alternately wound one circle in the Mth layer and the M-1th layer in a first direction along the circumference of the stator core, and then is crossed to the next two adjacent slot layers and alternately wound one circle, until the first winding unit is wound M / 2 circles and then is wound to the first layer of the stator slot, the second winding unit is connected to the tail end of the first winding unit in the first layer, and is alternately wound one circle in the first layer and the second layer in a second direction along the circumference of the stator core, and then is crossed to the next two adjacent slot layers and alternately wound one circle, until the second winding unit is wound M / 2 circles and then is wound to the Mth layer and led out; wherein, L=P*M / 4, and the first direction and the second direction are opposite.

[0009] Optionally, two of the hairpin coils of different layers that are adjacent in the current direction are connected to each other to form a welding end, and the lead-out wire of the stator winding is located at the welding end.

[0010] Optionally, the number N of the stator slots is a multiple of 24, the number of pole pairs P=N / 6, the span m=5, and the span n=7.

[0011] Optionally, the stator winding includes a U-phase winding, a V-phase winding and a W-phase winding; the U-phase winding, the V-phase winding and the W-phase winding all include a first branch and a second branch connected in parallel, the U-phase winding is offset by 4+i*N / P slots in a clockwise direction to obtain the V-phase winding, and the V-phase winding is offset by 4+i*N / P slots in a clockwise direction to obtain the W-phase winding, or, the U-phase winding is offset by 4+i*N / P slots in a counterclockwise direction to obtain the V-phase winding, and the V-phase winding is offset by 4+i*N / P slots in a counterclockwise direction to obtain the W-phase winding, wherein i∈[0, P-1].

[0012] Optionally, the number of stator slots N=48, the number of pole pairs P=8, the number of layers of the stator slots M=6, the 1st to 6th layers of the stator slots from the slot opening to the slot bottom are denoted as a to f layers, and xy is defined as the yth layer of the xth stator slot, x∈[1,48], y∈[a,f];

[0013] Each phase winding comprises a first branch and a second branch;

[0014] The winding connection route in the first branch of the phase winding of one phase is as follows: 26f→31e→38f→43e→2f→7e→14f→19e→26d→31c→38d→43c→2d→7c→14d→19c→26b→31a→38b→43a→2b→7a→14b→19a→26a→21b→14a→9b→2a→45b→38a→33b→26c→21d→14c→9d→2c→45d→38c→33d→26e→21f→14e→9f→2e→45f→38e →33f; and the winding connection routes in the second branch are: 27f→32e→39f→44e→3f→8e→15f→20e→27d→32c→39d→44c→3d→8c→15d→20c→27b→32a→39b→44a→3b→8a→15b→20a→13a→8b→1a→44b→37a→32b→25a→20b→13c→8d→1c→44d→37c→32d→25c→20d→13e→8f→1e→44f→37e→32f→25e→20f.

[0015] Optionally, the L different-layer hairpin coils of the first winding unit are all first hairpin coils, and the first hairpin coil includes a first coil body and a first bending portion, and the first coil body includes two mutually parallel first slot portions and a first connecting portion connecting one end of the two first slot portions, and the two first slot portions are respectively arranged in two adjacent layers of two stator slots with a span of n, and the other ends of the two first slot portions are respectively connected to the first bending portions, and the two first bending portions are respectively bent along the circumference of the stator core, and the bending directions of the two first bending portions are opposite.

[0016] Optionally, among the L different-layer hairpin coils of the second winding unit, one different-layer hairpin coil is a second hairpin coil, L-1 different-layer hairpin coils are the first hairpin coil, and the second hairpin coil is connected to the tail end of the first winding unit;

[0017] The second hairpin coil includes a second coil body and a second bending portion, the second coil body includes two second slotted portions parallel to each other and a second connecting portion connecting one end of the two second slotted portions, the two second slotted portions are respectively arranged in two adjacent layers of two stator slots with a span of n, the other ends of the two second slotted portions are respectively connected to the second bending portions, the two second bending portions are bent along the circumferential direction of the stator core, and the bending directions of the two second bending portions are the same

[0018] In a second aspect, the present invention provides a flat wire motor, comprising the flat wire motor stator as described above.

[0019] In a third aspect, the present invention provides a vehicle, comprising the flat wire motor stator as described above, or comprising the flat wire motor as described above.

[0020] The flat wire motor stator, the flat wire motor and the vehicle of the present invention have the following beneficial effects: N stator slots are arranged on the circumferential inner wall of the stator core, and M layers of heterogeneous hairpin coils are wound in the stator slots to form a stator winding; at the same time, the heterogeneous hairpin coils in each branch are arranged between two adjacent slot layers, and the span m of the heterogeneous hairpin coils is set to be equal to N / P-1, and the span n between two adjacent heterogeneous hairpin coils in the current direction is set to be equal to N / P+1, so that the span of the stator winding at the crown end is N / P-1, and the span at the welding end is N / P+1, so as to ensure that the coils of the flat wire winding are evenly distributed. Moreover, the stator winding has no coils of the same layer at the crown end, and the span is short. This not only makes the winding method of the flat wire stator winding more flexible and can be applied to winding schemes with different numbers of branches, but also reduces the radial and axial dimensions of the crown end of the stator winding, thereby reducing the copper content of the winding and saving the production cost of the winding. At the same time, it can also reduce the resistance of the winding itself, which is convenient for improving the efficiency of the motor. In addition, the different-layer hairpin coils are usually prefabricated stacked U-shaped coils, and winding with prefabricated stacked U-shaped coils can improve winding efficiency and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a flat wire motor stator according to an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the structure of the stator winding in an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of slot layer distribution of stator slots in an embodiment of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the same-layer card issuing coil in an embodiment of the present invention;

[0025] Figure 5 It is a structural schematic diagram of a different-layer card-issuing coil in an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the connection route of the first branch U1 of the U-phase winding of the 48-slot 8-pole 6-layer 2-branch flat wire motor in an embodiment of the present invention;

[0027] Figure 7 Schematic diagram of the connection route of the second branch U2 of the U-phase winding of the 48-slot 8-pole 6-layer 2-branch flat wire motor in an embodiment of the present invention;

[0028] Figure 8 Schematic diagram of the connection route of the U-phase winding of the 48-slot 8-pole 6-layer 2-branch flat wire motor in an embodiment of the present invention;

[0029] Fig. 9 Schematic diagram of the winding distribution of the U-phase winding of the 48-slot 8-pole 6-layer 2-branch flat wire motor in an embodiment of the present invention;

[0030] Fig.10 Schematic diagram of the winding distribution of the three-phase winding of the stator winding of the 48-slot, 8-pole, 6-layer, 2-branch flat wire motor in an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. stator core; 11. stator slot; 112. notch; 2. stator winding; 21. crown end; 22. welding end; 23. different-layer hairpin coil; 231. first hairpin coil; 2311. first coil body; 2311a. first slot part; 2311b. first connecting part; 2312. first bending part; 232. second hairpin coil; 2321. second coil body; 2321a. second slot part; 2321b. second connecting part; 2322. second bending part. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0034] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0035] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0036] In the related art, flat wire stator windings usually adopt full-pitch wave windings, which easily occupy a large amount of radial and axial space at the winding ends, increase winding costs and resistance, and limit the improvement of motor efficiency. Moreover, the design of flat wire stator windings is not flexible enough, has poor adaptability, and is difficult to adapt to parallel branches with different numbers of branches, which has certain limitations.

[0037] In view of the problems existing in the above-mentioned related technologies, the present invention provides a flat wire motor stator, a flat wire motor and a vehicle.

[0038] Combination Figures 1 to 3 As shown, a flat wire motor stator provided by an embodiment of the present invention includes a stator core 1 and a stator winding 2, wherein the inner wall of the stator core 1 is provided with a plurality of stator slots 11 along the circumferential direction, and each stator slot 11 is provided with M slot layers for wiring the stator winding 2 along the radial direction of the stator core 1, and the flat wire motor stator is used for a flat wire motor with N stator slots 11 and P pole pairs, wherein M is an even number greater than or equal to 4; the stator winding 2 includes a plurality of phase windings, each phase winding includes a plurality of parallel branches, each branch is formed by connecting a plurality of different-layer hairpin coils 23 in series, and the different-layer hairpin coils 23 are arranged between two adjacent slot layers with a span of m, and the span between two adjacent different-layer hairpin coils 23 in the current direction is n, wherein L=P*M / 2, m=N / P-1, and n=N / P+1.

[0039] Specifically, N stator slots 11 are evenly distributed on the inner wall of the stator core 1 along the circumference of the stator core 1, and M slot layers for wiring the stator winding 2 are provided in the stator slots 11 along the radial direction of the stator core 1, that is, the stator winding 2 is arranged in layers in the stator slots 11, wherein M is an even number greater than or equal to 4, for example, the number of slot layers M of the stator slots 11 can be 4, 6 or 8. In addition, the slot layers of the stator slots 11 can be recorded from the outside to the inside as the 1st layer to the Mth layer, or the slot layers of the stator slots 11 can be recorded from the inside to the outside as the 1st layer to the Mth layer, which is not specifically limited here and can be selected as needed in actual applications. The stator winding 2 can include a two-phase winding or a three-phase winding, and each phase winding can include two parallel branches or three parallel branches, which is not specifically limited here. Each branch is wound with a plurality of different-layer hairpin coils 23, wherein each different-layer hairpin coil 23 is arranged between two adjacent slot layers and occupies different slot layers, and in the current direction, all two adjacent different-layer hairpin coils 23 are connected in series by welding, thereby forming a welding end 22 of the stator winding 2, and the end that does not need to be welded is called the crown end 21 of the stator winding 2. In addition, the crown end 21 and the welding end 22 of the stator winding 2 extend out of the stator slot 11 along the axial direction of the stator core 1, respectively, to facilitate wiring and welding. The span of the different-layer hairpin coil 23 is m=N / P-1, and the span between two adjacent different-layer hairpin coils 23 in the current direction is n=N / P+1, that is, the span of the stator winding 2 at the crown end 21 is m, and the span at the welding end 22 is n, and there is no coil of the same layer at the crown end 21, that is, the two effective sides of the hairpin coil (that is, the part of the coil inserted in the stator slot 11) are spanned in different slot layers. Among them, the span of the hairpin coil refers to the number of slots occupied by two adjacent effective sides of a coil (that is, the part of the coil inserted in the stator slot 11), and the span between two adjacent hairpin coils refers to the number of slots occupied by two adjacent effective sides of two adjacent coils (that is, the part of the coil inserted in the stator slot 11). When the span = the number of stator slots / the number of pole pairs, the span is a whole span, when the span is less than the whole span, the span is a short span, and when the span is greater than the whole span, the span is a long span.

[0040] The flat wire motor stator in this embodiment can be formed by arranging N stator slots 11 on the circumferential inner wall of the stator core 1, and winding M layers of heterogeneous hairpin coils 23 in the stator slots 11 to form a stator winding 2. At the same time, by arranging the heterogeneous hairpin coils 23 in each branch between two adjacent slot layers, and setting the span m of the heterogeneous hairpin coils 23 to be equal to N / P-1, and setting the span n between two adjacent heterogeneous hairpin coils 23 in the current direction to be equal to N / P+1, the stator winding 2 has a span of N / P-1 at the crown end 21 and a span of N / P+1 at the welding end 22, so as to ensure that the coils of the flat wire winding are evenly distributed. Moreover, the stator winding 2 has no coils of the same layer at the crown end 21, and the span is short, so that not only the winding method of the flat wire stator winding is more flexible and can be applied to winding schemes with different numbers of branches, but also the radial and axial dimensions of the crown end 21 of the stator winding 2 can be reduced, thereby reducing the copper content of the winding and saving the production cost of the winding. At the same time, the resistance of the winding itself can also be reduced, which is convenient for improving the efficiency of the motor. In addition, the different-layer hairpin coil 23 is usually a prefabricated stacked U-shaped coil, and winding with the prefabricated stacked U-shaped coil can improve the winding efficiency and convenience.

[0041] Optionally, combined Figure 6 and Figure 7 As shown, the branch includes two first winding units and second winding units connected in series, and the first winding unit and the second winding unit both include L different-layer hairpin coils 23 connected in series. The first winding unit is introduced from the Mth layer of the stator slot 11, and is alternately wound one circle in the Mth layer and the M-1th layer according to the first direction along the circumference of the stator core 1, and then is crossed to the next two adjacent slot layers and alternately wound one circle, until the first winding unit is wound M / 2 circles and then is wound to the first layer of the stator slot 11, the second winding unit is connected to the tail end of the first winding unit in the first layer, and is alternately wound one circle in the first layer and the second layer according to the second direction along the circumference of the stator core 1, and then is crossed to the next two adjacent slot layers and alternately wound one circle, until the second winding unit is wound M / 2 circles and then is wound to the Mth layer and led out; wherein, L=P*M / 4, and the first direction and the second direction are opposite.

[0042] It should be noted that the first direction may be a clockwise direction, in which case the second direction is a counterclockwise direction; the first direction may also be a counterclockwise direction, in which case the second direction is a clockwise direction.

[0043] In this optional embodiment, each branch is composed of two first winding units and second winding units connected in series, wherein the first winding unit is formed by L different-layer hairpin coils 23 wound in a first direction, and the second winding unit is formed by L different-layer hairpin coils 23 wound in a second direction. For the convenience of description, the winding method of the branch is explained here by taking the slot layer number M=6 of the stator slot 11 as an example. After the first winding unit is introduced into the stator core 1 from the 6th layer of the stator slot 11, it starts to be wound in the first direction along the circumference of the stator core 1. First, P / 2 different-layer hairpin coils 23 are alternately wound in the 6th layer and the 5th layer for one circle and then span to the 4th layer. Then, P / 2 different-layer hairpin coils 23 are alternately wound in the 4th layer and the 3rd layer for one circle and then span to the 2nd layer. Finally, P / 2 different-layer hairpin coils 23 are alternately wound in the 2nd layer and the 1st layer. After the second winding unit is connected to the tail end of the first winding unit in the first layer, it starts to be wound in the second direction along the circumference of the stator core 1, firstly, P / 2 different-layer hairpin coils 23 are alternately wound in the first layer and the second layer for one circle and then are extended to the third layer, then P / 2 different-layer hairpin coils 23 are alternately wound in the third layer and the fourth layer for one circle and then are extended to the fifth layer, and finally, P / 2 different-layer hairpin coils 23 are alternately wound in the fifth layer and the sixth layer for one circle and then are wound to the sixth layer and led out from the sixth layer. When the number of slot layers of the stator slot 11 is M=6, this winding method makes the windings in any three adjacent stator slots 11 occupied by the two branches all have a 3, 6, 3 distribution, such as Fig. 9 As shown, the left stator slot 11 among the three adjacent stator slots 11 has windings distributed in the odd-numbered layers, the middle stator slot 11 has windings distributed in the 6 slot layers, and the right stator slot 11 has windings distributed in the even-numbered layers; when the number of slot layers of the stator slot 11 is M=8, this winding method makes the windings in any three adjacent stator slots 11 occupied by the two branches to be distributed in 4, 8, 4, that is, the left stator slot 11 among the three adjacent stator slots 11 has windings distributed in the odd-numbered layers, the middle stator slot 11 has windings distributed in the 8 slot layers, and the right stator slot 11 has windings distributed in the even-numbered layers.

[0044] In this way, it is ensured that each parallel branch is distributed in a circular symmetrical structure in the stator slot 11, and then each phase winding is evenly and symmetrically distributed, so that the potential of each branch is balanced, there is no circulating current, and harmonics are offset, which greatly improves the performance of the motor; moreover, the left stator slot 11 of any three adjacent stator slots 11 occupied by the two branches of the phase winding is distributed with windings in odd layers, the M slot layers of the middle stator slot 11 are distributed with windings, and the right stator slot 11 is distributed with windings in even layers. In this way, when winding other phase windings by translating the number of slots, it can be ensured that the distribution form of each phase winding in multiple stator slots 11 is completely consistent, thereby further reducing the circulating current of the motor and improving the performance of the motor. In addition, the lead wires of each phase winding of the stator winding 2 are all located in the first edge layer, so that different wiring methods such as triangle or star can be selected for wiring as needed, thereby improving the flexibility of phase winding wiring.

[0045] Optionally, combined Figure 1 and Figure 2 As shown, two hairpin coils 23 of different layers adjacent to each other in the current direction are connected to each other to form a welding end 22 , and the lead-out wires of the stator winding 2 are located at the welding end 22 .

[0046] In this optional embodiment, the stator winding 2 leads out from the Mth layer of the stator slot 11 at the welding end 22, so that the crown end 21 of the stator winding 2 has no lead-out wires, which can simplify the structure of the tooling equipment that matches the crown end 21, thereby facilitating the universal design of the tooling equipment that matches the crown end 21.

[0047] Furthermore, combined with Figure 3 As shown, the first to Mth layers of the stator slots 11 are sequentially distributed from the slot opening 112 of the stator slot 11 to the slot bottom along the radial direction of the stator core 1. In this way, the winding of each branch can be wound from the slot bottom of the stator slot 11, so that the slot bottom and side wall of the stator slot 11 can be used to limit the winding to prevent the winding from being separated from the slot opening of the stator slot 11, thereby improving the convenience of winding and ensuring that the winding is evenly distributed in the stator slot 11.

[0048] Optionally, the number N of the stator slots 11 is a multiple of 24, the number of pole pairs P=N / 6, the span m=5, and the span n=7.

[0049] In this optional embodiment, the number N of the stator slots 11 can be 24, 48, 72, etc., and correspondingly, the number of pole pairs P can be 4, 8, 12, etc., and the whole pitch is N / P=6, the span m=5, and the span n=7. In this way, on the one hand, the flat wire motor stator can be suitable for N slots N / 6 poles motor, such as 48 slots 8 poles motor or 72 slots 12 poles motor, on the other hand, it can ensure that the span of the crown end 21 of the stator winding 2 of the motor that meets the N slots N / 6 poles is 5, which is convenient for the universal design of the tooling equipment matched with the crown end 21.

[0050] Optionally, combined Fig.10 As shown, the stator winding 2 includes a U-phase winding, a V-phase winding and a W-phase winding; the U-phase winding, the V-phase winding and the W-phase winding all include a first branch and a second branch connected in parallel, the U-phase winding is offset by 4+i*N / P slots in a clockwise direction to obtain the V-phase winding, and the V-phase winding is offset by 4+i*N / P slots in a clockwise direction to obtain the W-phase winding, or the U-phase winding is offset by 4+i*N / P slots in a counterclockwise direction to obtain the V-phase winding, and the V-phase winding is offset by 4+i*N / P slots in a counterclockwise direction to obtain the W-phase winding, wherein i∈[0,P-1] is an integer.

[0051] It should be noted that Fig.10 There are three areas of different shades, among which the lightest area represents the distribution area of ​​the two parallel branches of the U-phase winding (i.e., branches U1 and U2), the second darkest area represents the distribution area of ​​the two parallel branches of the V-phase winding (i.e., branches V1 and V2), and the darkest area represents the distribution area of ​​the two parallel branches of the W-phase winding (i.e., branches W1 and W2).

[0052] In one example, when the first branch U1 in the U-phase winding enters the stator core 1 from the Mth layer of the 26th slot, and the second branch U2 enters the stator core 1 from the Mth layer of the 27th slot, the U-phase winding can be offset by 4 slots in a counterclockwise direction to obtain the V-phase winding, and the V-phase winding can be offset by 4 slots in a counterclockwise direction to obtain the W-phase winding. At this time, Fig.10 As shown, the first branch V1 of the V-phase winding enters the stator core 1 from the Mth layer of the 22nd slot, and the second branch V2 enters the stator core 1 from the Mth layer of the 23rd slot. The first branch W1 of the W-phase winding enters the stator core 1 from the Mth layer of the 18th slot, and the second branch W2 enters the stator core 1 from the Mth layer of the 19th slot. Alternatively, the U-phase winding may be shifted by 4 slots in a clockwise direction to obtain the V-phase winding, and the V-phase winding may be shifted by 4 slots in a clockwise direction to obtain the W-phase winding. In this case, the first branch V1 of the V-phase winding enters the stator core 1 from the Mth layer of the 30th slot, and the second branch V2 enters the stator core 1 from the Mth layer of the 31st slot. The first branch W1 of the W-phase winding enters the stator core 1 from the Mth layer of the 34th slot, and the second branch W2 enters the stator core 1 from the Mth layer of the 35th slot.

[0053] In this way, the V-phase winding can be wound on the basis of the U-phase winding, and the W-phase winding can be wound on the basis of the V-phase winding by shifting a certain number of slots in a clockwise or counterclockwise direction, thereby improving the convenience of winding. Moreover, the number of shifted slots is set to 4+i*N / P slots to ensure that the windings of each phase are evenly and symmetrically distributed, thereby reducing the circulating current and harmonics of the motor.

[0054] Optionally, combined Figures 6 to 9 As shown, the number of stator slots 11 is N=48, the number of pole pairs is P=8, the number of layers of the stator slots 11 is M=6, and the 1st to 6th layers of the stator slots 11 from the slot opening to the slot bottom are denoted as a to f layers, and xy is defined as the yth layer of the xth stator slot, x∈[1,48], y∈[a,f];

[0055] Each phase winding comprises a first branch and a second branch;

[0056] The winding connection route in the first branch of the phase winding of one phase is as follows: 26f→31e→38f→43e→2f→7e→14f→19e→26d→31c→38d→43c→2d→7c→14d→19c→26b→31a→38b→43a→2b→7a→14b→19a→26a→21b→14a→9b→2a→45b→38a→33b→26c→21d→14c→9d→2c→45d→38c→33d→26e→21f→14e→9f→2e→45f→38e →33f; and the winding connection routes in the second branch are: 27f→32e→39f→44e→3f→8e→15f→20e→27d→32c→39d→44c→3d→8c→15d→20c→27b→32a→39b→44a→3b→8a→15b→20a→13a→8b→1a→44b→37a→32b→25a→20b→13c→8d→1c→44d→37c→32d→25c→20d→13e→8f→1e→44f→37e→32f→25e→20f.

[0057] In this optional embodiment, 26f represents the fth layer of the 26th stator slot, taking the U-phase winding as an example, Figure 6 As shown, the first branch U1 of the U-phase winding is wound from the f-th layer of the 26th stator slot. Similarly, the second branch U2 of the U-phase winding is wound from the f-th layer of the 27th stator slot. The two branches of the phase winding are wound respectively according to the above winding connection route to realize the phase winding arrangement of 48 slots, 8 poles, 2 branches and 6 layers.

[0058] In addition, combined with the winding slot offset relationship of the U-phase winding, the V-phase winding and the W-phase winding described in the above embodiment, the connection route of the V-phase winding and the W-phase winding can also be obtained, such as Fig.10The winding distribution diagram of the three-phase winding is shown, wherein the first branch V1 of the V-phase winding is wound from the f-th layer of the 22nd stator slot, the second branch V2 of the V-phase winding is wound from the f-th layer of the 23rd stator slot, the first branch W1 of the W-phase winding is wound from the f-th layer of the 18th stator slot, and the second branch W2 of the W-phase winding is wound from the f-th layer of the 19th stator slot.

[0059] Optionally, combined Figure 4 As shown, the L different-layer hairpin coils 23 in the first winding unit are all first hairpin coils 231, and the first hairpin coil 231 includes a first coil body 2311 and a first bending portion 2312. The first coil body 2311 includes two mutually parallel first through-slot portions 2311a and a first connecting portion 2311b connecting one end of the two first through-slot portions 2311a. The two first through-slot portions 2311a are respectively arranged in two adjacent layers of two stator slots 11 with a span of n. The other ends of the two first through-slot portions 2311a are respectively connected to the first bending portions 2312. The two first bending portions 2312 are respectively bent along the circumferential direction of the stator core 1, and the bending directions of the two first bending portions 2312 are opposite.

[0060] In this way, by setting the first bending portions 2312 at both ends of the first coil body 2311 of the first hairpin coil 231, it is convenient to weld the first bending portions 2312 of two adjacent first hairpin coils 231 to achieve series connection, and the two first bending portions 2312 of the first hairpin coil 231 are bent in opposite directions to facilitate winding the wire along the circumferential direction and crossing to the next slot layer.

[0061] Optionally, combined Figure 5 As shown, among the L different-layer hairpin coils 23 of the second winding unit, one different-layer hairpin coil 23 is a second hairpin coil 232, and L-1 different-layer hairpin coils 23 are first hairpin coils 231, and the second hairpin coil 232 is connected to the tail end of the first winding unit; the second hairpin coil 232 includes a second coil body 2321 and a second bending portion 2322, the second coil body 2321 includes two second slotted portions 2321a parallel to each other and a second connecting portion 2321b connecting one end of the two second slotted portions 2321a, the two second slotted portions 2321a are respectively penetrated in two adjacent layers of two stator slots 11 with a span of n, the other ends of the two second slotted portions 2321a are respectively connected to the second bending portions 2322, the two second bending portions 2322 are bent along the circumferential direction of the stator core 1, and the bending directions of the two second bending portions 2322 are the same.

[0062] In this way, by setting the second bending portions 2322 at the two ends of the second coil body 2321 of the second clip coil 232, the two second bending portions 2322 of the second clip coil 232 are welded to the first clip coil 231 of the first winding unit and the first clip coil 231 of the second winding unit respectively to achieve series connection, and the two second bending portions 2322 of the second clip coil 232 are bent in the same direction, so that the second winding unit is arranged adjacent to the first winding unit, ensuring that each parallel branch is distributed in a ring-shaped symmetrical structure in the stator slot 11.

[0063] An embodiment of the present invention provides a flat wire motor, comprising the flat wire motor stator as described above.

[0064] The beneficial effects of the flat wire motor of this embodiment relative to the prior art are the same as those of the flat wire motor stator described above, and will not be described in detail here.

[0065] A vehicle provided by an embodiment of the present invention includes the flat wire motor stator as described above, or includes the flat wire motor as described above.

[0066] The beneficial effects of the vehicle of this embodiment relative to the prior art are the same as those of the flat wire motor stator described above, and will not be described in detail here.

[0067] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A flat wire motor stator, characterized in that: The invention comprises a stator core (1) and a stator winding (2), wherein the inner wall of the stator core (1) is provided with a plurality of stator slots (11) along the circumferential direction, and each of the stator slots (11) is provided with M slot layers for wiring the stator winding (2) along the radial direction of the stator core (1), and the flat wire motor stator is used for a flat wire motor having N stator slots (11) and P pole pairs, wherein M is an even number greater than or equal to 4; The stator winding (2) comprises a multi-phase winding, each phase of the winding comprises a plurality of parallel branches, each branch is formed by a plurality of different-layer hairpin coils (23) connected in series, the different-layer hairpin coils (23) are arranged between two adjacent slot layers with a span of m, and the span between two adjacent different-layer hairpin coils (23) in the current direction is n, wherein m=N / P-1, and n=N / P+1.

2. The flat wire motor stator according to claim 1, characterized in that: The branch comprises two first winding units and a second winding unit connected in series, the first winding unit and the second winding unit both comprising L different-layer hairpin coils (23) connected in series, the first winding unit being introduced from the Mth layer of the stator slot (11), and being wound alternately in the Mth layer and the M-1th layer in a first direction along the circumference of the stator core (1) for one turn, and then being arranged across the next two adjacent slot layers for one turn, until the first winding unit is wound M / 2 turns and then wound to the first layer of the stator slot (11), the second winding unit being connected to the tail end of the first winding unit in the first layer, and being wound alternately in the first layer and the second layer in a second direction along the circumference of the stator core (1) for one turn, and then being arranged across the next two adjacent slot layers for one turn, until the second winding unit is wound M / 2 turns and then wound to the Mth layer for leading out; wherein, L=P*M / 4, and the first direction is opposite to the second direction.

3. The flat wire motor stator according to claim 1, characterized in that: Two of the hairpin coils (23) of different layers that are adjacent in the current direction are connected to each other to form a welding end (22), and the lead-out wires of the stator winding (2) are located at the welding end (22).

4. The flat wire motor stator according to claim 1, characterized in that: The number N of the stator slots (11) is a multiple of 24, the number of pole pairs P=N / 6, the span m=5, and the span n=7.

5. The flat wire motor stator according to claim 1, characterized in that: The stator winding (2) comprises a U-phase winding, a V-phase winding and a W-phase winding; the U-phase winding, the V-phase winding and the W-phase winding all comprise a first branch and a second branch connected in parallel, the U-phase winding is offset by 4+i*N / P slots in a clockwise direction to obtain the V-phase winding, and the V-phase winding is offset by 4+i*N / P slots in a clockwise direction to obtain the W-phase winding, or the U-phase winding is offset by 4+i*N / P slots in a counterclockwise direction to obtain the V-phase winding, and the V-phase winding is offset by 4+i*N / P slots in a counterclockwise direction to obtain the W-phase winding, wherein i∈[0, P-1].

6. The flat wire motor stator according to claim 1, characterized in that: The number of stator slots (11) is N=48, the number of pole pairs is P=8, the number of layers of the stator slots (11) is M=6, the 1st to 6th layers of the stator slots (11) from the slot opening to the slot bottom are marked as a to f layers, and xy is defined as the yth layer of the xth stator slot, x∈[1,48], y∈[a,f]; Each phase winding comprises a first branch and a second branch; The winding connection route of the first branch of the phase winding of one phase is as follows: 26f→31e→38f→43e→2f→7e→14f→19e→26d→31c→38d→43c→2d→7c→14d→19c→26b→31a→38b→43a→2b→7a→14b→19a→26a→21b→14a→9b→2a→45b→38a→33b→26c→21d→14c→9d→2c→45d→38c→33d→26e→21f→14e→9f→2e→45f→38e →33f; and the winding connection routes of the second branch are: 27f→32e→39f→44e→3f→8e→15f→20e→27d→32c→39d→44c→3d→8c→15d→20c→27b→32a→39b→44a→3b→8a→15b→20a→13a→8b→1a→44b→37a→32b→25a→20b→13c→8d→1c→44d→37c→32d→25c→20d→13e→8f→1e→44f→37e→32f→25e→20f.

7. The flat wire motor stator according to claim 2, characterized in that: The L different-layer hairpin coils (23) of the first winding unit are all first hairpin coils (231), the first hairpin coil (231) comprising a first coil body (2311) and a first bending portion (2312), the first coil body (2311) comprising two mutually parallel first through-slot portions (2311a) and a first connecting portion (2311b) connecting one end of the two first through-slot portions (2311a), the two first through-slot portions (2311a) being respectively arranged in two adjacent layers of two stator slots (11) with a span of n, the other ends of the two first through-slot portions (2311a) being respectively connected to the first bending portion (2312), the two first bending portions (2312) being respectively bent along the circumferential direction of the stator core (1), and the bending directions of the two first bending portions (2312) being opposite.

8. The flat wire motor stator according to claim 7, characterized in that: Among the L different-layer card-hairing coils (23) of the second winding unit, one different-layer card-hairing coil (23) is a second card-hairing coil (232), L-1 different-layer card-hairing coils (23) are the first card-hairing coil (231), and the second card-hairing coil (232) is connected to the tail end of the first winding unit; The second hairpin coil (232) comprises a second coil body (2321) and a second bending portion (2322), the second coil body (2321) comprising two second slotted portions (2321a) parallel to each other and a second connecting portion (2321b) connecting one end of the two second slotted portions (2321a), the two second slotted portions (2321a) being respectively arranged in two adjacent layers of two stator slots (11) with a span of n, the other ends of the two second slotted portions (2321a) being respectively connected to the second bending portions (2322), the two second bending portions (2322) being bent along the circumferential direction of the stator core (1), and the bending directions of the two second bending portions (2322) being the same.

9. A flat wire motor, characterized in that: It comprises the flat wire motor stator as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: It comprises the flat wire motor stator as claimed in any one of claims 1 to 8, or it comprises the flat wire motor as claimed in claim 9.

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