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 winding and a stator core provided with a stator slot, the stator winding comprises a multi-phase winding, each branch of the phase winding is formed by connecting a plurality of hairpin coils in series, the hairpin coils comprise the same-layer hairpin coils and the different-layer hairpin coils, the same-layer hairpin coils are arranged at the first layer and the Mth layer of the stator slots in a crossing mode, the different-layer hairpin coils are arranged between two adjacent slot layers at the middle layer of the stator slots in a crossing mode, and M / 2-1 different-layer hairpin coils are connected between two adjacent same-layer hairpin coils in series in the current direction. And the span of the same-layer hairpin coil positioned on the Mth layer is N / P-1, the span of the different-layer hairpin coil and the same-layer hairpin coil positioned on the first layer is N / P + 1, and the span between two adjacent hairpin coils in the current direction is N / P-1. Therefore, the copper consumption and the resistance of the flat wire 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] Compared with round copper wire motors, the slot fill rate of flat wire motors can reach more than 60%, which is much higher than the slot fill rate of round copper wire. The increase in slot fill rate means that the DC resistance of the winding can be reduced, the copper loss of the motor can be reduced, and the efficiency of the motor can be improved without changing the slot. Therefore, flat wire motors have become an important measure to promote the lightweight of automobiles, increase the cruising range of electric vehicles, and reduce the cost of powertrains, and are widely used in new energy vehicle drive systems.

[0003] 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. 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 winding and a stator core, 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 branch is formed by a plurality of hairpin coils connected in series, the hairpin coils include same-layer hairpin coils and different-layer hairpin coils, the same-layer hairpin coils are arranged across the 1st layer and the Mth layer of the stator slot, the different-layer hairpin coils are arranged between two adjacent slot layers at the middle layer of the stator slot, M / 2-1 different-layer hairpin coils are connected in series between two adjacent same-layer hairpin coils in the current direction, and the span of the different-layer hairpin coils is n, the span of the same-layer hairpin coils at the Mth layer is m, the span of the same-layer hairpin coils at the 1st layer is n, and the span between two adjacent hairpin coils in the current direction is m; wherein, L=P, m=N / P-1, n=N / P+1.

[0008] Optionally, the branch includes P / 2 winding units connected in series, and the branch uses a same-layer hairpin coil with a span of m as the winding starting point in the Mth layer of the stator slot, uses M / 2-1 different-layer hairpin coils to wind from the M-1th layer to the 2nd layer of the stator slot, and uses a same-layer hairpin coil with a span of n to perform same-layer commutation in the 1st layer, and uses M / 2-1 different-layer hairpin coils to wind back from the 2nd layer of the stator slot to the M-1th layer to complete the winding of one winding unit, and then winds the second winding unit according to the above winding method, until P / 2 winding units are completed and wound to the M-1th layer of the stator slot for lead-out.

[0009] Optionally, two adjacent hairpin coils 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 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].

[0011] 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.

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

[0015] Optionally, the same-layer hairpin coil includes a first coil body and a first bending portion, 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, the two first slot portions of the same-layer hairpin coil with a span of m are respectively arranged in two adjacent layers of the two stator slots with a span of m, the two first slot portions of the same-layer hairpin coil with a span of n are respectively arranged in two adjacent layers of the two stator slots with a span of n, the other ends of the two first slot portions are respectively connected to the first bending portions, 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 the same.

[0016] Optionally, the different-layer hairpin coil includes a second coil body and a second bending portion, the second coil body includes two second slot portions parallel to each other and a second connecting portion connecting one end of the two second slot portions, the two second slot portions are respectively arranged in two adjacent layers of the two stator slots with a span of n, the other ends of the two second slot portions are respectively connected to the second bending portions, the two second bending portions are respectively bent along the circumference of the stator core, and the bending directions of the two second bending portions are opposite.

[0017] In a second aspect, the present invention provides a flat wire motor, comprising the flat wire motor stator as described above.

[0018] 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.

[0019] The flat wire motor stator, the flat wire motor and the vehicle of the present invention have the following beneficial effects: N stator slots can be arranged on the circumferential inner wall of the stator core, and M layers of hairpin coils can be wound in the stator slots to form a stator winding; the same-layer hairpin coils among the multiple hairpin coils of each branch are arranged across the first and Mth layers of the stator slots, the different-layer hairpin coils among the multiple hairpin coils are arranged across the two adjacent slot layers at the middle layer of the stator slots, and M / 2-1 different-layer hairpin coils are connected in series between two adjacent same-layer hairpin coils in the current direction, that is, the hairpin coils located at the first or Mth layer are connected in series. The head end and tail end of the same-layer hairpin coil at the Mth layer are respectively connected to two different-layer hairpin coils, so that there is no same-layer coil at, for example, the welding end of the stator winding; at the same time, by setting the span m of the same-layer hairpin coil at the Mth layer to be equal to N / P-1, and setting the span n of the different-layer hairpin coil and the same-layer hairpin coil at the 1st layer to be equal to N / P+1, the stator winding is arranged with two spans of N / P-1 and N / P+1 at the crown end, and with a span of N / P-1 at the welding end, so as to ensure that the coils of the flat wire winding are evenly distributed. Moreover, by setting the span m between two adjacent hairpin coils in the current direction to be equal to N / P-1, the span of the welding end of the stator winding is made short. In this way, the stator winding has no coils on the same layer at the welding end and is arranged in a short distance. Not only does it make the winding method of the flat wire stator winding more flexible and suitable for winding schemes with different numbers of branches, it can also reduce the radial and axial dimensions of the welding end of the stator winding, thereby reducing the copper consumption 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a flat wire motor stator according to an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the structure of the stator winding in an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of slot layer distribution of stator slots in an embodiment of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the same-layer card issuing coil in an embodiment of the present invention;

[0024] Figure 5 It is a structural schematic diagram of a different-layer card-issuing coil in an embodiment of the present invention;

[0025] 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;

[0026] 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;

[0027] 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;

[0028] 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;

[0029] 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.

[0030] Description of reference numerals:

[0031] 1. Stator winding; 11. Crown end; 12. Welding end; 13. Hairpin coil; 131. Same-layer hairpin coil; 1311. First coil body; 1311a. First slot part; 1311b. First connecting part; 1312. First bending part; 132. Different-layer hairpin coil; 1321. Second coil body; 1321a. Second slot part; 1321b. Second connecting part; 1322. Second bending part; 2. Stator core; 21. Stator slot; 211. Notch. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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".

[0035] 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.

[0036] 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.

[0037] Combination Figures 1 to 3 As shown, a flat wire motor stator provided by an embodiment of the present invention comprises a stator winding 1 and a stator core 2, wherein the inner wall of the stator core 2 is provided with a plurality of stator slots 21 along the circumferential direction, and each stator slot 21 is provided with M slot layers for wiring the stator winding 1 along the radial direction of the stator core 2, and the flat wire motor stator is used for a flat wire motor having N stator slots 21 and P pole pairs, wherein M is an even number greater than or equal to 4;

[0038] The stator winding 1 includes a multi-phase winding, each phase winding includes a plurality of parallel branches, each branch is formed by a plurality of hairpin coils 13 connected in series, the hairpin coils 13 include same-layer hairpin coils 131 and different-layer hairpin coils 132, the same-layer hairpin coils 131 are arranged across the 1st layer and the Mth layer of the stator slot 21, the different-layer hairpin coils 132 are arranged across two adjacent slot layers at the middle layer of the stator slot 21, M / 2-1 different-layer hairpin coils 132 are connected in series between two adjacent same-layer hairpin coils 131 in the current direction, and the span of the different-layer hairpin coils 132 is n, the span of the same-layer hairpin coils 131 located at the Mth layer is m, the span of the same-layer hairpin coils 131 located at the 1st layer is n, and the span between two adjacent hairpin coils 13 in the current direction is m; wherein, m=N / P-1, n=N / P+1.

[0039] Specifically, N stator slots 21 are evenly distributed on the inner wall of the stator core 2 along the circumferential direction of the stator core 2, and M slot layers for wiring the stator winding 1 are provided in the stator slots 21 along the radial direction of the stator core 2, that is, the stator winding 1 is arranged in layers in the stator slots 21, wherein M is an even number greater than or equal to 4, for example, the number of slot layers M of the stator slots 21 can be 4, 6 or 8, etc. In addition, the slot layers of the stator slots 21 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 21 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 1 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 same-layer hairpin coils 131 and a plurality of different-layer hairpin coils 132. The same-layer hairpin coils 131 are arranged across the 1st layer and the Mth layer of the stator slot 21, and each different-layer hairpin coil 132 is arranged between two adjacent slot layers at the middle layer of the stator slot 21, and each occupies a different slot layer, wherein the middle layer of the stator slot 21 is the 2nd layer to the M-1th layer of the stator slot 21. Moreover, in the current direction, all two adjacent hairpin coils 13 are connected in series by welding to form the welding end 12 of the stator winding 1, and the end that does not need to be welded is called the crown end 11 of the stator winding 1. In addition, the crown end 11 and the welding end 12 of the stator winding 1 extend out of the stator slot 21 along the axial direction of the stator core 2, respectively, to facilitate wiring and welding. At the same time, in the current direction, M / 2-1 different-layer hairpin coils 132 are connected in series between two adjacent same-layer hairpin coils 131, that is, the head end and the tail end of the same-layer hairpin coil 131 located at the 1st layer or the Mth layer are respectively connected to two different-layer hairpin coils 132, so that at the welding end, the pins of any two adjacent hairpin coils 13 (that is, the bent part of the hairpin coil introduced later) are connected across layers. This arrangement makes the welding end 12 of the stator winding 1 have no same-layer coil.

[0040] More specifically, in the current direction, the span between two adjacent hairpin coils 13 is m=N / P-1, and the span of the hairpin coils 132 on different layers is n=N / P+1, while the hairpin coils 131 on the same layer have two spans, m and n, where the span of the hairpin coils 131 on the same layer at the Mth layer is m, and the span of the hairpin coils 131 on the same layer at the 1st layer is n. The span of the crown end 11 is the span of the hairpin coil 13, and the span of the welding end 12 is the span between two adjacent hairpin coils 13, that is, the stator winding 1 has two spans, N / P-1 and N / P+1, at the crown end 11, and the span at the welding end 12 is N / P-1. Among them, the span of the hairpin coil 13 refers to the number of slots occupied between two adjacent effective sides of a coil (i.e., the part of the coil passing through the stator slot 21), and the span between two adjacent hairpin coils 13 refers to the number of slots occupied between two adjacent effective sides of two adjacent coils (i.e., the part of the coil passing through the stator slot 21). 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.

[0041] The flat wire motor stator in this embodiment can be formed by arranging N stator slots 21 on the circumferential inner wall of the stator core 2, and winding M layers of hairpin coils 13 in the stator slots 21 to form a stator winding 1; by arranging the same-layer hairpin coils 131 among the multiple hairpin coils 13 of each branch across the first layer and the Mth layer of the stator slot 21, arranging the different-layer hairpin coils 132 among the multiple hairpin coils 13 across the two adjacent slot layers at the middle layer of the stator slot 21, and connecting M / 2-1 different-layer hairpin coils 132 in series between two adjacent same-layer hairpin coils 131 in the current direction, that is, the hairpin coils 132 located at the first layer or the Mth layer are connected in series. The head end and the tail end of the same-layer hairpin coil 131 are respectively connected to two different-layer hairpin coils 132, so that there is no same-layer coil at, for example, the welding end 12 of the stator winding 1; at the same time, by setting the span m of the same-layer hairpin coil 131 located at the Mth layer to be equal to N / P-1, and setting the span n of the different-layer hairpin coil 132 and the same-layer hairpin coil 131 located at the 1st layer to be equal to N / P+1, the stator winding 1 is arranged with two spans of N / P-1 and N / P+1 at the crown end 11, and is arranged with a span of N / P-1 at the welding end 12, so as to ensure that the coils of the flat wire winding are evenly distributed. Moreover, by setting the span m between two adjacent hairpin coils 13 in the current direction to be equal to N / P-1, the span of the welding end 12 of the stator winding 1 is made short. In this way, the stator winding 1 has no coils on the same layer at the welding end 12 and is arranged in a short distance. Not only does it make the winding method of the flat wire stator winding more flexible and applicable to winding schemes with different numbers of branches, it can also reduce the radial and axial dimensions of the welding end 12 of the stator winding 1, thereby reducing the copper consumption 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.

[0042] Optionally, combined Figure 5 and Figure 6 As shown, the branch includes P / 2 winding units connected in series. The branch uses a same-layer hairpin coil 131 with a span of m as the winding starting point at the Mth layer of the stator slot 21, uses M / 2-1 different-layer hairpin coils 132 to wind from the M-1th layer to the 1st layer of the stator slot 21, and uses a same-layer hairpin coil 131 with a span of n to perform same-layer reversal at the 1st layer, uses M / 2-1 different-layer hairpin coils 132 to wind back from the 2nd layer of the stator slot to the M-1th layer to complete the winding of one winding unit, and then winds the second winding unit according to the above winding method, until P / 2 winding units are completed and wound to the M-1th layer of the stator slot 21 for leading out.

[0043] It should be noted that the Mth layer of the stator slot 21 may be at the bottom of the stator slot 21, that is, the outermost slot layer of the stator slot 21. In this case, the first layer of the stator slot 21 is at the slot opening 211 of the stator slot 21, that is, the innermost slot layer of the stator slot 21; the Mth layer of the stator slot 21 may also be at the slot opening 211 of the stator slot 21, that is, the innermost slot layer of the stator slot 21. In this case, the first layer of the stator slot 21 is at the bottom of the stator slot 21, that is, the outermost slot layer of the stator slot 21. In practical applications, the outermost slot layer at the bottom of the stator slot 21 is usually taken as the Mth layer of the stator slot 21, and the innermost slot layer at the slot opening 211 of the stator slot 21 is taken as the first layer of the stator slot 21. In this way, the winding of each branch can be wound starting from the bottom of the stator slot 21, so that the bottom and side walls of the stator slot 21 can be used to limit the winding and prevent the winding from escaping from the slot opening of the stator slot 21, thereby improving the convenience of winding and ensuring that the winding is evenly distributed in the stator slot 21.

[0044] In this optional embodiment, each branch is composed of P / 2 winding units connected in series, specifically: the branch uses a same-layer hairpin coil 131 with a span of m as the winding starting point in the Mth layer of the stator slot 21, and uses M / 2-1 different-layer hairpin coils 132 to wind from the M-1th layer to the 2nd layer of the stator slot 21, and uses a same-layer hairpin coil 131 with a span of n to perform same-layer reversal in the 1st layer, that is, it crosses n slots in the reverse direction in the 1st layer, and uses M / 2-1 different-layer hairpin coils 132 to wind back from the 2nd layer of the stator slot to the M-1th layer to complete the winding of a winding unit, and so on, until P / 2 winding units are completed and wound to the M-1th layer of the stator slot 21 for lead-out. When the number of slot layers of the stator slot 21 is M=6, this winding method makes the windings in any three adjacent stator slots 21 occupied by the two branches distributed in 3, 6, 3, such as Fig. 9 As shown, the left stator slot 21 among the three adjacent stator slots 21 has windings distributed in the odd-numbered layers, the middle stator slot 21 has windings distributed in the 6 slot layers, and the right stator slot 21 has windings distributed in the even-numbered layers; when the number of slot layers of the stator slot 21 is M=8, this winding method makes the windings in any three adjacent stator slots 21 occupied by the two branches to be distributed in 4, 8, 4, that is, the left stator slot 21 among the three adjacent stator slots 21 has windings distributed in the odd-numbered layers, the middle stator slot 21 has windings distributed in the 8 slot layers, and the right stator slot 21 has windings distributed in the even-numbered layers.

[0045] In this way, it is ensured that each parallel branch is distributed in a ring-shaped symmetrical structure in the stator slot 21, and then each phase winding is evenly and symmetrically distributed, so that each branch has a balanced potential, no circulating current, and harmonics are offset, which greatly improves the performance of the motor. Moreover, the left stator slot 21 of any three adjacent stator slots 21 occupied by the two branches of the phase winding has windings distributed in odd layers, the middle stator slot 21 has windings distributed in M ​​slot layers, and the right stator slot 21 has windings distributed in even layers. In this way, when winding other phase windings by shifting the number of slots, it can be ensured that the distribution form of each phase winding in multiple stator slots 21 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 1 are arranged in the Mth layer and the M-1th layer of the stator slot 21, so that the lead wires of each phase winding are distributed in two rows in the circumferential direction of the stator core 2 instead of one row. This not only facilitates the use of a star connection method to connect the phase windings, but also shortens the space occupied by the lead wires of each phase winding in the circumferential direction of the stator core 2. In this way, when the bus bar is used to connect the phase windings, the size of the bus bar in the circumferential direction of the stator core 2 can be reduced, making the structure of the flat wire motor stator more compact and convenient for layout.

[0046] Optionally, combined Figure 1 and Figure 2 As shown, two hairpin coils 13 adjacent to each other in the current direction are connected to form a welding end 12 , and the lead wires of the stator winding 1 are located at the welding end 12 .

[0047] In this optional embodiment, the stator winding 1 leads out from the Mth layer and the M-1th layer of the stator slot 21 at the welding end 12, so that the crown end 11 of the stator winding 1 has no lead-out wires, which can simplify the structure of the tooling equipment that matches the crown end 11, thereby facilitating the universal design of the tooling equipment that matches the crown end 11.

[0048] Optionally, the number N of the stator slots 21 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 21 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 welding end 12 of the stator winding 1 of the motor that meets the N slots N / 6 poles is 5, which is convenient for universal welding tooling.

[0050] Optionally, combined Fig.10As shown, the stator winding 1 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 W-phase winding (i.e., branches W1 and W2), and the darkest area represents the distribution area of ​​the two parallel branches of the V-phase winding (i.e., branches V1 and V2).

[0052] In one example, when the first branch U1 in the U-phase winding enters the stator core 2 from the Mth layer of the second slot, and the second branch U2 enters the stator core 2 from the Mth layer of the third slot, the U-phase winding can be shifted by 4 slots in a clockwise direction to obtain the V-phase winding, and the V-phase winding can be shifted by 4 slots in a clockwise 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 2 from the Mth layer of the 6th slot, and the second branch V2 enters the stator core 2 from the Mth layer of the 7th slot. The first branch W1 of the W-phase winding enters the stator core 2 from the Mth layer of the 10th slot, and the second branch W2 enters the stator core 2 from the Mth layer of the 11th slot. Alternatively, the U-phase winding may be offset by 4 slots in a counterclockwise direction to obtain the V-phase winding, and the V-phase winding may be offset by 4 slots in a counterclockwise direction to obtain the W-phase winding. In this case, the first branch V1 of the V-phase winding enters the stator core 2 from the Mth layer of the 46th slot, and the second branch V2 enters the stator core 2 from the Mth layer of the 47th slot. The first branch W1 of the W-phase winding enters the stator core 2 from the Mth layer of the 42nd slot, and the second branch W2 enters the stator core 2 from the Mth layer of the 43rd 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 9As shown, the number of stator slots 21 is N=48, the number of pole pairs is P=8, the number of layers of the stator slots 21 is M=6, and the 1st to 6th layers of the stator slots 21 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 one phase of the phase winding is as follows: 2f→45f→2e→9d→14c→21b→26a→19a→14b→7c→2d→43e→38f→33f→38e→45d→2c→9b→14a→7a→2b→43c→38d→31e→26f→21f→26e→33d→38c→45b→2a→43a→38b→31c→26d→19e→14f→9f→14e→21d→26c→33b→38a→31a→26b→19c→14 d→7e; and the winding connection routes in the second branch are: 3f→8f→13e→20d→25c→32b→37a→44a→39b→32c→27d→20e→15f→20f→25e→32d→37c→44b→1a→8a→3b→44c→39d→32e→27f→32f→37e→44d→1c→8b→13a→20a→15b→8c→3d→44e→39f→44f→1e→8d→13c→20b→25a→32a→27b→20c→15d→8e.

[0057] In this optional embodiment, 2f represents the fth layer of the second 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 second stator slot. Similarly, the second branch U2 of the U-phase winding is wound from the f-th layer of the third stator slot. The two branches of the phase winding are wound separately 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.10 The 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 6th stator slot, the second branch V2 of the V-phase winding is wound from the f-th layer of the 7th stator slot, the first branch W1 of the W-phase winding is wound from the f-th layer of the 10th stator slot, and the second branch W2 of the W-phase winding is wound from the f-th layer of the 11th stator slot.

[0059] Optionally, combined Figure 4 As shown, the same-layer hairpin coil 131 includes a first coil body 1311 and a first bending portion 1312. The first coil body 1311 includes two mutually parallel first slot portions 1311a and a first connecting portion 1311b connecting one end of the two first slot portions 1311a. The two first slot portions 1311a of the same-layer hairpin coil 131 with a span of m are respectively arranged in two adjacent layers of two stator slots 21 with a span of m. The two first slot portions 1311a of the same-layer hairpin coil 131 with a span of n are respectively arranged in two adjacent layers of two stator slots 21 with a span of n. The other ends of the two first slot portions 1311a are respectively connected to the first bending portions 1312. The two first bending portions 1312 are respectively bent along the circumferential direction of the stator core 2, and the bending directions of the two first bending portions 1312 are the same.

[0060] In this way, by setting the first bending portion 1312 at both ends of the first coil body 1311 of the same-layer hairpin coil 131, the two first bending portions 1312 of the same-layer hairpin coil 131 are respectively welded to the two different-layer hairpin coils 132 to achieve series connection, and the two first bending portions 1312 of the same-layer hairpin coil 131 are bent in the same direction so that P / 2 winding units can be evenly arranged, thereby ensuring that each parallel branch is distributed in a ring-shaped symmetrical structure in the stator slot 21.

[0061] Optionally, combined Figure 5 As shown, the different-layer hairpin coil 132 includes a second coil body 1321 and a second bending portion 1322. The second coil body 1321 includes two second slot portions 1321a parallel to each other and a second connecting portion 1321b connecting one end of the two second slot portions 1321a. The two second slot portions 1321a are respectively arranged in two adjacent layers of two stator slots 21 with a span of n. The other ends of the two second slot portions 1321a are respectively connected to the second bending portions 1322. The two second bending portions 1322 are respectively bent along the circumference of the stator core 2, and the bending directions of the two second bending portions 1322 are opposite.

[0062] In this way, by setting the second bending portions 1322 at both ends of the second coil body 1321 of the different-layer hairpin coil 132, it is convenient to weld the second bending portions 1322 of two adjacent different-layer hairpin coils 132 to achieve series connection, and the two second bending portions 1322 of the different-layer hairpin coil 132 are bent in opposite directions to facilitate winding along the circumferential direction and crossing to the next slot layer.

[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 winding (1) and a stator core (2), wherein the inner wall of the stator core (2) is provided with a plurality of stator slots (21) along the circumferential direction, and each of the stator slots (21) is provided with M slot layers for wiring the stator winding (1) along the radial direction of the stator core (2), and the flat wire motor stator is used for a flat wire motor having N stator slots (21) and P pole pairs, wherein M is an even number greater than or equal to 4; The stator winding (1) comprises a multi-phase winding, each phase of the winding comprises a plurality of parallel branches, each branch is formed by a plurality of hairpin coils (13) connected in series, the hairpin coils (13) comprise same-layer hairpin coils (131) and different-layer hairpin coils (132), the same-layer hairpin coils (131) are arranged across the first layer and the Mth layer of the stator slot (21), the different-layer hairpin coils (132) are arranged across two adjacent slot layers at the middle layer of the stator slot (21), M / 2-1 different-layer card-issuing coils (132) are connected in series between two adjacent same-layer card-issuing coils (131) in the current direction, and the span of the different-layer card-issuing coils (132) is n, the span of the same-layer card-issuing coils (131) located at the Mth layer is m, the span of the same-layer card-issuing coils (131) located at the 1st layer is n, and the span between two adjacent card-issuing coils (13) in the current direction is m; wherein m=N / P-1, n=N / P+1.

2. The flat wire motor stator according to claim 1, characterized in that: The branch comprises P / 2 winding units connected in series. The branch uses a same-layer hairpin coil (131) with a span of m as a winding starting point at the Mth layer of the stator slot (21), uses M / 2-1 different-layer hairpin coils (132) to wind from the M-1th layer to the second layer of the stator slot (21), and uses a same-layer hairpin coil (131) with a span of n to perform same-layer reversal at the first layer, uses M / 2-1 different-layer hairpin coils (132) to wind back from the second layer of the stator slot to the M-1th layer to complete the winding of one winding unit, and then winds the second winding unit according to the above winding method until P / 2 winding units are completed and wound to the M-1th layer of the stator slot (21) for leading out.

3. The flat wire motor stator according to claim 1, characterized in that: Two adjacent hairpin coils (13) in the current direction are connected to each other to form a welding end (12), and the lead-out wire of the stator winding (1) is located at the welding end (12).

4. The flat wire motor stator according to claim 1, characterized in that: The stator winding (1) 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].

5. The flat wire motor stator according to claim 1, characterized in that: The number N of the stator slots (21) is a multiple of 24, the number of pole pairs P=N / 6, the span m=5, and the span n=7.

6. The flat wire motor stator according to claim 1, characterized in that: The number N of the stator slots (21) is 48, the number P of pole pairs is 8, the number M of the layers of the stator slots (21) is 6, the 1st to 6th layers of the stator slots (21) 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 in the first branch of the phase winding of one phase is as follows: 2f→45f→2e→9d→14c→21b→26a→19a→14b→7c→2d→43e→38f→33f→38e→45d→2c→9b→14a→7a→2b→43c→38d→31e→26f→21f→26e→33d→38c→45b→2a→43a→38b→31c→26d→19e→14f→9f→14e→21d→26c→33b→38a→31a→26b→19c→14 d→7e; and the winding connection routes in the second branch are: 3f→8f→13e→20d→25c→32b→37a→44a→39b→32c→27d→20e→15f→20f→25e→32d→37c→44b→1a→8a→3b→44c→39d→32e→27f→32f→37e→44d→1c→8b→13a→20a→15b→8c→3d→44e→39f→44f→1e→8d→13c→20b→25a→32a→27b→20c→15d→8e.

7. The flat wire motor stator according to claim 1, characterized in that: The same-layer hairpin coil (131) comprises a first coil body (1311) and a first bending portion (1312), the first coil body (1311) comprises two mutually parallel first through-slot portions (1311a) and a first connecting portion (1311b) connecting one end of the two first through-slot portions (1311a), the two first through-slot portions (1311a) of the same-layer hairpin coil (131) with a span of m are respectively penetrated in two stator slots (21 ), the two first slotted portions (1311a) of the hairpin coil (131) of the same layer with a span of n are respectively arranged in two adjacent layers of the two stator slots (21) with a span of n, the other ends of the two first slotted portions (1311a) are respectively connected to the first bending portions (1312), the two first bending portions (1312) are respectively bent along the circumferential direction of the stator core (2), and the bending directions of the two first bending portions (1312) are the same.

8. The flat wire motor stator according to claim 1, characterized in that: The heterogeneous hairpin coil (132) comprises a second coil body (1321) and a second bending portion (1322), wherein the second coil body (1321) comprises two second slotted portions (1321a) parallel to each other and a second connecting portion (1321b) connecting one end of the two second slotted portions (1321a), wherein the two second slotted portions (1321a) are respectively arranged in two adjacent layers of two stator slots (21) with a span of n, and the other ends of the two second slotted portions (1321a) are respectively connected to the second bending portions (1322), and the two second bending portions (1322) are respectively bent along the circumferential direction of the stator core (2), and the bending directions of the two second bending portions (1322) are opposite.

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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