Flat wire winding stator, flat wire motor and vehicle

Abstract

The invention provides a flat wire winding stator, a flat wire motor and a vehicle, and relates to the technical field of vehicle parts, the flat wire winding 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 for winding and wiring along the radial direction of the stator core, the flat wire winding stator is used for a motor with the number of stator grooves being N and the number of pole pairs being P, and M is an even number larger than or equal to 4. The stator winding extends out of the stator slot along two axial ends of the stator core to form a crown end and a welding end, an outgoing line of the stator winding is located at the crown end, the span of the stator winding at the welding end is m, the span of the stator winding at the crown end is n, m = N / P-1, n = N / P + 1. Therefore, the structure of the welding tool equipment can be simplified, the cost of the welding tool can be reduced, and the sizes of the welding end in the radial direction and the axial direction can be reduced, so that the copper consumption of the winding is reduced, and the production cost of the winding is saved.

Description

Technical Field

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

[0002] Stator windings can be divided into round wire windings and flat wire windings. Among them, motors using round wire stator windings are called round wire motors, and motors using flat wire stator windings are called flat wire motors. 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] When winding the stator core, full-pitch wave winding is usually used. For example, taking the winding of 8 layers as an example, a hairpin coil with a full span is used. After winding a circle from the 1st and 2nd layers along the circumference, it enters the 3rd and 4th layers, then enters the 5th and 6th layers, and finally winds back after winding a circle on the 7th and 8th layers, and winds back from the 8th and 7th layers to the 2nd and 1st layers in this way, and leads the wire from the welding end. This winding method of leading the wire from the welding end makes the welding process of the winding welding end more difficult, increases the cost of welding tooling equipment, and is not conducive to the platform design of the welding end. Moreover, the use of full-pitch winding easily occupies a large amount of radial and axial space at the end of the winding, increases the winding cost and resistance, and reduces the efficiency of the motor. Summary of the invention

[0004] The problem solved by the invention is: how to reduce the size of the winding end and reduce the platform cost of the winding welding end.

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

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

[0007] The stator winding extends out of the stator slot at both ends of the axial direction of the stator core to form a crown end and a welding end. The lead wire of the stator winding is located at the crown end, and the span of the stator winding at the welding end is m and the span at the crown end is n, wherein m=N / P-1 and n=N / P+1.

[0008] Optionally, the stator winding includes a multi-phase phase winding, each of the phase winding includes a plurality of parallel branches, the branches include a first winding section, a connecting section and a second winding section, the first winding section is introduced from the first layer of the stator slot at the crown end, and is alternately wound one turn in two adjacent slot layers along the circumference of the stator core in a first direction, and then is crossed to the next two adjacent slot layers and alternately wound one turn, until the first winding section is wound M / 2 turns and then is wound to the Mth layer, the connecting section connects the tail end of the first winding section in the Mth layer with the head end of the second winding section in the Mth layer with a span q, the second winding section is alternately wound one turn in two adjacent slot layers along the circumference of the stator core in a second direction, and then is crossed to the next two adjacent slot layers and alternately wound one turn, until the second winding section is wound M / 2 turns and then is wound to the first layer and led out from the crown end, the first direction and the second direction are opposite.

[0009] Optionally, each of the phase windings includes a first branch and a second branch connected in parallel, a span of the connecting section in the first branch is q=n, and a span of the connecting section in the second branch is q=m.

[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 first layer of the stator slots is the innermost slot layer of the stator slots, and the Mth layer of the stator slots is the outermost slot layer of the stator slots.

[0012] Optionally, the stator winding includes a U-phase winding, a V-phase winding and a W-phase winding; the U-phase winding is offset by K+N / P slots in the first direction to obtain the V-phase winding, and the V-phase winding is offset by K+N / P slots in the first direction to obtain the W-phase winding; or, the U-phase winding is offset by K+N / P slots in the second direction to obtain the V-phase winding, and the V-phase winding is offset by K+N / P slots in the second direction to obtain the W-phase winding, wherein K is the slot number at which the head end of the first winding segment of the first branch in the U-phase winding is located.

[0013] Optionally, the number of stator slots N=72, the number of pole pairs P=12, the number of layers of the stator slots M=6, the 1st to 6th layers of the stator slots from the inside to the outside are recorded as a to f layers, and xy is defined as the yth layer of the xth stator slot, x∈[1,72], y∈[a,f];

[0014] The winding connection route in the first branch of the U-phase winding is as follows: 2a→7b→14a→19b→26a→31b→38a→43b→50a→55b→62a→67b→2c→7d→14c→19d→26c→31d→38c→43d→50c→55d→62c→67d→2e→7f→14e→19f→26e→31f→38e→43f→50e→ 55f→62e→67f→2f→69e→62f→57e→50f→45e→38f→33e→26f→21e→14f→9e→2d→69c→62d→57c→50d→45c→38d→33c→26d→21c→14d→9c→2b→69a→62b→57a→50b→45a→38b→33a→26b→21a→14b→9a;

[0015] The winding connection route in the second branch of the U-phase winding is as follows: 3a→8b→15a→20b→27a→32b→39a→44b→51a→56b→63a→68b→3c→8d→15c→20d→27c→32d→39c→44d→51c→56d→63c→68d→3e→8f→15e→20f→27e→32f→39e→44f→51e→ 56f→63e→68f→1f→68e→61f→56e→49f→44e→37f→32e→25f→20e→13f→8e→1d→68c→61d→56c→49d→44c→37d→32c→25d→20c→13d→8c→1b→68a→61b→56a→49b→44a→37b→32a→25b→20a→13b→8a.

[0016] Optionally, the first winding segment and the second winding segment each include a first coil and a plurality of second coils connected in series in sequence, the first coil is a single coil and is located in the first layer of the stator slot, and the second coil is a stacked U-shaped coil;

[0017] And / or, the connecting section includes a third coil, and the third coil is a stacked U-shaped coil.

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

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

[0020] The flat wire winding stator, flat wire motor and 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 flat wire windings are wound in the stator slots to form a stator winding. At the same time, the lead wires of the stator winding are arranged at the crown end of the stator winding. In this way, when welding is performed at the welding end after the stator winding is completed, there is no need to configure tooling equipment to fix or separate the lead wires, which not only simplifies the welding process and reduces the difficulty of manufacturing the motor, but also simplifies the structure of the welding tooling equipment, reduces the cost of welding tooling, and facilitates platform design and reduces platform cost. In addition, by setting the span m of the stator winding at the welding end to be equal to N / P-1, and setting the span n of the stator winding at the crown end to be equal to N / P+1, it is ensured that the coils of the flat wire winding are evenly distributed, and the span of the stator winding at the welding end is short. In this way, the radial and axial dimensions of the welding end can be reduced, thereby reducing the copper consumption of the winding, saving the production cost of the winding, and at the same time, it can also reduce the resistance of the winding itself, so as to improve the efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the flat wire winding stator in an embodiment of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a flat wire winding in an embodiment of the present invention;

[0023] Figure 3 It is a partial cross-sectional schematic diagram of a flat wire winding stator in an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the connection of the first branch of the U-phase winding in an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the winding distribution of the first branch and the second branch of the U-phase winding in an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of winding distribution of three-phase windings of the stator winding in an embodiment of the present invention;

[0027] Figure 7 is a schematic structural diagram of a first coil in an embodiment of the present invention;

[0028] Figure 8 is a schematic structural diagram of a second coil in an embodiment of the present invention;

[0029] Fig. 9 Schematic diagram of the structure of the third coil in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. stator core; 11. stator slot; 112. notch; 2. stator winding; 21. crown end; 22. welding end; 23. first coil; 231. first coil body; 2311. first slot portion; 2312. lead portion; 232. first bending portion; 24. second coil; 241. second coil body; 2411. second slot portion; 2412. first connection portion; 242. second bending portion; 25. third coil; 251. third coil body; 2511. third slot portion; 2512. second connection portion; 252. third bending portion. 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, when winding the stator core, a full-pitch wave winding is usually used. For example, taking the winding of 8 layers as an example, a hairpin coil with a full span is used. After winding a circle along the circumference from the 1st and 2nd layers, it enters the 3rd and 4th layers, then enters the 5th and 6th layers, and finally winds back after winding a circle around the 7th and 8th layers, and winds back from the 8th and 7th layers to the 2nd and 1st layers in this way, and leads the wire from the welding end. This winding method of leading the wire from the welding end increases the difficulty of the welding process of the winding welding end, increases the cost of welding tooling and equipment, and is not conducive to the platform design of the welding end. Moreover, the use of full-pitch winding easily occupies a large amount of radial and axial space at the end of the winding, increases the winding cost and resistance, and reduces the efficiency of the motor.

[0036] In view of the problems existing in the above-mentioned related technologies, the present invention provides a flat wire winding stator, a flat wire motor and a vehicle.

[0037] Combination Figure 1 , Figure 2 and Figure 3 As shown, a flat wire winding stator provided by an embodiment of the present invention includes a stator core 1 and a stator winding 2. The inner wall of the stator core 1 is provided with a plurality of stator slots 11 along the circumferential direction. Each stator slot 11 is provided with M slot layers for winding wires along the radial direction of the stator core 1. The flat wire winding stator is used for a 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 extends out of the stator slot 11 at both ends of the axial direction of the stator core 1 to form a crown end 21 and a welding end 22. The lead wire of the stator winding 2 is located at the crown end 21, and the span of the stator winding 2 at the welding end 22 is m, and the span at the crown end 21 is n, wherein m=N / P-1, n=N / P+1.

[0038] Specifically, N stator slots 11 are evenly distributed on the inner wall of the stator core 1 along the circumferential direction of the stator core 1, and M slot layers for winding wires 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 may be 4, 6 or 8, etc. In addition, the stator slots 11 may be recorded as the 1st to the Mth layers from the outside to the inside, or may be recorded as the 1st to the Mth layers from the inside to the outside, which is not specifically limited here and may be selected as needed in practical applications. The stator winding 2 is arranged in the stator slot 11 along the axial direction of the stator core 1, and the two axial ends of the stator winding 2 extend out of the stator slot 11 to form a crown end 21 and a welding end 22, and the lead wire of the stator winding 2 is located at the crown end 21, that is, the stator winding 2 is led out from the crown end 21, not from the welding end 22. In addition, the span of the stator winding 2 at the crown end 21 is n=N / P+1, and the span at the welding end 22 is m=N / P-1, wherein the span refers to the number of slots occupied between two adjacent effective sides of a coil (that is, the part of the coil passing through the stator slot 11), when the span=the number of stator slots / the number of pole pairs, the span is a full span, when the span is less than the full span, the span is a short span, and when the span is greater than the full span, the span is a long span. That is to say, the span of the stator winding 2 at the crown end 21 is long, and the span of the stator winding 2 at the welding end 22 is short.

[0039] The flat wire winding stator in this embodiment can be formed by setting N stator slots 11 on the circumferential inner wall of the stator core 1, and winding M layers of flat wire windings in the stator slots 11 to form a stator winding 2. At the same time, the lead wires of the stator winding 2 are set at the crown end 21 of the stator winding 2. In this way, when welding is performed at the welding end 22 after the stator winding 2 is wound, there is no need to configure tooling equipment to fix or separate the lead wires, which can not only simplify the welding process and reduce the manufacturing difficulty of the motor, but also simplify the structure of the welding tooling equipment, reduce the cost of welding tooling, and facilitate platform design and reduce platform cost. In addition, by setting the span m of the stator winding 2 at the welding end 22 to be equal to N / P-1, and setting the span n of the stator winding 2 at the crown end 21 to be equal to N / P+1, it is ensured that the coils of the flat wire winding are evenly distributed, and the span of the stator winding 2 at the welding end 22 is short. In this way, the radial and axial dimensions of the welding end 22 can be reduced, thereby reducing the copper consumption of the winding, saving the production cost of the winding, and at the same time, it can also reduce the resistance of the winding itself, so as to improve the efficiency of the motor.

[0040] Optionally, combined Figure 3 As shown, the first layer of the stator slots 11 is the innermost slot layer of the stator slots 11 , and the Mth layer of the stator slots 11 is the outermost slot layer of the stator slots 11 .

[0041] In this optional embodiment, the innermost slot layer of the stator slot 11 refers to the slot layer located at the slot bottom of the stator slot 11, and the outermost slot layer of the stator slot 11 refers to the slot layer located at the slot opening of the stator slot 11, that is, the stator slot 11 is recorded as the 1st layer to the Mth layer from the inside to the outside. In this way, the winding of each branch can be wound from the slot bottom of the stator slot 11, so that the winding can be limited by the slot bottom and side wall of the stator slot 11 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.

[0042] Optionally, combined Figure 4 As shown, the stator winding 2 includes a multi-phase phase winding, each phase winding includes a plurality of parallel branches, the branches include a first winding section, a connecting section and a second winding section, the first winding section is introduced from the first layer of the stator slot 11 at the crown end 21, and is alternately wound one circle in two adjacent slot layers along the circumference of the stator core 1 in a first direction, and then is crossed to the next two adjacent slot layers for alternating winding one circle, until the first winding section is wound M / 2 circles and then is wound to the Mth layer, the connecting section connects the tail end of the first winding section at the Mth layer with the head end of the second winding section in the Mth layer with a span q, the second winding section is alternately wound one circle in two adjacent slot layers along the circumference of the stator core 1 in a second direction, and then is crossed to the next two adjacent slot layers for alternating winding one circle, until the second winding section is wound M / 2 circles and then is wound to the first layer and led out from the crown end 21, the first direction and the second direction are opposite.

[0043] 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.

[0044] In this optional embodiment, the stator winding 2 may include a two-phase winding or a three-phase winding, and each phase winding may include two parallel branches or three parallel branches, which is not specifically limited here. Each branch is composed of a first winding section, a connecting section, and a second winding section, wherein the winding directions of the first winding section and the second winding section are opposite. For the convenience of description, the winding method of the branch is explained by taking the slot layer number M=6 of the stator slot 11 as an example. The first winding section is introduced from the first layer of the stator slot 11 at the crown end 21, and is alternately wound one circle in the first layer and the second layer along the circumference of the stator core 1 in the first direction, and then is cross-laid to the third layer, and is alternately wound one circle in the third layer and the fourth layer, and then is cross-laid to the fifth layer, and then is alternately wound one circle in the fifth layer and the sixth layer, and then is wound to The connection section connects the tail end of the first winding section with the head end of the second winding section in the sixth layer with a span q in the sixth layer. The second winding section is wound alternately in the sixth layer and the fifth layer along the circumference of the stator core 1 in the second direction, and then spans to the fourth layer. It is wound alternately in the fourth layer and the third layer, and then spans to the second layer. Then, it is wound alternately in the second layer and the first layer, and then wound to the first layer, and then led out from the crown end 21. In this way, it is ensured that each parallel branch is distributed in a ring-shaped symmetrical structure in the stator slot 11, and then each phase winding is evenly and symmetrically distributed, so that each branch has a balanced potential, no circulating current, and offsets harmonics, which greatly improves the performance of the motor.

[0045] Optionally, combined Figure 5 and Figure 6 As shown, each phase winding includes a first branch and a second branch connected in parallel, the span of the connecting section in the first branch is q=n, and the span of the connecting section in the second branch is q=m.

[0046] In this optional embodiment, taking the number of slot layers of the stator slot 11 as 6, by setting the span q of the connecting section in the first branch to be equal to N / P+1, and setting the span q of the connecting section in the second branch to be equal to N / P-1, the windings in any three adjacent stator slots 11 occupied by the two branches are distributed in 3, 6, 3, as shown in FIG. Figure 5 As shown, the left stator slot 11 of the three adjacent stator slots 11 has windings distributed in the even-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 odd-numbered 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, as shown in FIG. Figure 6 As shown, the motor circulating current is further reduced and the motor performance is improved.

[0047] 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.

[0048] 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 winding stator can be applied to the motor with N slots and N / 6 poles, such as the 48-slot 8-pole motor or the 72-slot 12-pole motor, and on the other hand, it can ensure that the span of the welding end 22 of the stator winding 2 of the motor with N slots and N / 6 poles is 5, which is convenient for universal welding tooling.

[0049] Optionally, combined Figure 6 As shown, the stator winding includes a U-phase winding, a V-phase winding and a W-phase winding; the U-phase winding is offset by K+N / P slots in a first direction to obtain the V-phase winding, and the V-phase winding is offset by K+N / P slots in the first direction to obtain the W-phase winding, or the U-phase winding is offset by K+N / P slots in a second direction to obtain the V-phase winding, and the V-phase winding is offset by K+N / P slots in the second direction to obtain the W-phase winding, wherein K is the slot number where the head end of the first winding segment of the first branch in the U-phase winding is located.

[0050] It should be noted that Figure 6 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).

[0051] In one example, when the first winding segment of the first branch in the U-phase winding enters the stator core 1 from the first layer of the second slot, the head end of the first winding segment is located in the second slot, that is, the slot number where the head end of the first winding segment is located is 2; in another example, when the first winding segment of the first branch in the U-phase winding enters the stator core 1 from the first layer of the fifth slot, the head end of the first winding segment is located in the fifth slot, that is, the slot number where the head end of the first winding segment is located is 5.

[0052] 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 K+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.

[0053] Optionally, combined Figure 3 , Figure 4 and Figure 5 As shown, the number of slot layers of the stator slot 11 is M=6, the number of pole pairs is P=N / 6, and the 1st to 6th layers from the inside to the outside of the stator slot 11 are marked as a to f layers;

[0054] The winding connection route of the first branch U1 is: Figure 4 The arrow in the figure indicates the direction, and the first winding section is connected from the ath layer and the Kth slot (for example Figure 4 and Figure 5 After the second slot of the a-th layer (shown in FIG. 1 ) enters the stator core 1, the welding end 22 crosses to the K+m-th slot of the b-th layer (for example, Figure 4 and Figure 5 ), and then crosses to the K+m+nth groove of the ath layer at the crown end 21 (e.g. Figure 4 and Figure 5 ), crosses to the K+2m+nth groove of the b layer at the welding end 22, crosses to the K+2m+2nth groove of the a layer at the crown end 21, and so on, until it crosses to the K+6m+5nth groove of the b layer at the welding end 22 (for example Figure 4 and Figure 5 The crown end 21 crosses to the Kth groove of the cth layer, the welding end 22 crosses to the K+mth groove of the dth layer, the crown end 21 crosses to the K+m+nth groove of the cth layer, the welding end 22 crosses to the K+2m+nth groove of the d layer, the crown end 21 crosses to the K+2m+2nth groove of the cth layer, and so on, until the welding end 22 crosses to the K+6m+5nth groove of the d layer, and then the crown end 21 crosses to the Kth groove of the e layer, the welding end 22 crosses to the K+mth groove of the f layer, and so on. The crown end 21 crosses to the K+m+nth slot of the e-th layer, crosses to the K+2m+nth slot of the f-th layer at the welding end 22, crosses to the K+2m+2nth slot of the e-th layer at the crown end 21, and so on, until it crosses to the K+6m+5nth slot of the f-th layer at the welding end 22; after the connecting section is connected to the tail end of the first winding section, it enters the stator core 1 at the K+6m+5nth slot of the f-th layer, and crosses to the Kth slot of the f-th layer to connect with the head end of the second winding section, and the second winding section starts from the K+Nmth slot of the e-th layer (for example, Figure 4 and Figure 5 The stator core 1 is connected to the 69th slot of the e-th layer and crosses to the K+Nmnth slot of the f-th layer at the crown end 21 (i.e. Figure 4 and Figure 5 ), and crosses to the K+N-2m-n groove of the e-th layer at the welding end 22, and then crosses to the K+N-2m-2n groove of the f-th layer at the crown end 21, and so on, until it crosses to the K+N-6m-5n groove of the e-th layer at the welding end 22 (for example Figure 4 and Figure 5The crown end 21 crosses to the Kth groove of the dth layer, and the welding end 22 crosses to the K+Nmth groove of the cth layer, and the crown end 21 crosses to the K+Nmnth groove of the dth layer, and the welding end 22 crosses to the K+N-2m-n groove of the cth layer, and then the crown end 21 crosses to the K+N-2m-2n groove of the dth layer, and so on, until it crosses to the K+N-6m-5n groove of the cth layer at the welding end 22, and then at the crown end 21 It crosses to the Kth groove of the bth layer, crosses to the K+Nmth groove of the ath layer at the welding end 22, crosses to the K+Nmnth groove of the bth layer at the crown end 21, and crosses to the K+N-2m-nth groove of the ath layer at the welding end 22, and then crosses to the K+N-2m-2nth groove of the bth layer at the crown end 21, and so on, until it crosses to the K+N-6m-5nth groove of the ath layer at the welding end 22, and is led out from the K+N-6m-5nth groove of the ath layer at the crown end 21 (i.e. Figure 4 and Figure 5 9th slot in layer a);

[0055] The winding connection route of the second branch U2 is: the first winding section starts from the ath layer and the Jth slot (i.e. Figure 4 and Figure 5 After the 3rd slot of the ath layer shown in FIG. 1 enters the stator core 1, the welding end 22 crosses to the J+mth slot of the bth layer (i.e. Figure 4 and Figure 5 The crown end 21 then crosses to the J+m+nth groove of the ath layer (i.e. Figure 4 and Figure 5 ), at the welding end 22 it crosses to the J+2m+nth groove of the b layer, at the crown end 21 it crosses to the J+2m+2nth groove of the a layer, and so on, until at the welding end 22 it crosses to the J+6m+5nth groove of the b layer (i.e. Figure 4 and Figure 5 ), then spans to the Jth groove of the cth layer at the crown end 21, spans to the J+mth groove of the dth layer at the welding end 22, spans to the J+m+nth groove of the cth layer at the crown end 21, spans to the J+2m+nth groove of the dth layer at the welding end 22, spans to the J+2m+2nth groove of the cth layer at the crown end 21, and so on, until spanning to the J+6m+5nth groove of the dth layer at the welding end 22, then spans to the Jth groove of the eth layer at the crown end 21, spans to the J+mth groove of the fth layer at the welding end 22, spans to the J+m+nth groove of the e layer at the crown end 21, spans to the J+2m+n groove of the f layer at the welding end 22, spans to the J+2m+2n groove of the e layer at the crown end 21, and so on, until spanning to the J+6m+5nth groove of the f layer at the welding end 22 (i.e. Figure 4 and Figure 5The connecting section is connected to the tail end of the first winding section, then enters the stator core 1 at the J+6m+5n slot of the f layer, and crosses to the K-1 slot of the f layer (i.e. Figure 4 and Figure 5 The f-th layer and the 1st slot as shown in the figure are connected to the head end of the second winding section, and the second winding section enters the stator core 1 from the welding end 22 to the J+Nm-th slot of the e-th layer, and crosses to the J+N-2m-n slot of the e-th layer at the crown end 21, and then crosses to the J+N-2m-2n slot of the f-th layer at the crown end 21, and so on, until it crosses to the J+N-6m-5n slot of the e-th layer at the welding end 22, and then crosses to the K-1 slot of the d-th layer at the crown end 21, crosses to the J+Nm-th slot of the c-th layer at the welding end 22, crosses to the J+Nmn slot of the d-th layer at the crown end 21, and crosses to the J+N-2m-2n slot of the c-th layer at the welding end 22. -2m-n groove, and then cross to the J+N-2m-2n groove of the d layer at the crown end 21, and so on, until it crosses to the J+N-6m-5n groove of the c layer at the welding end 22, and then crosses to the K-1 groove of the b layer at the crown end 21, and crosses to the J+Nm groove of the a layer at the welding end 22, and crosses to the J+Nmn groove of the b layer at the crown end 21, and crosses to the J+N-2m-n groove of the a layer at the welding end 22, and then crosses to the J+N-2m-2n groove of the b layer at the crown end 21, and so on, until it crosses to the J+N-6m-5n groove of the a layer at the welding end 22, and from the J+N-6m-5n groove of the a layer (i.e. Figure 4 and Figure 5 The 8th slot of the ath layer as shown in FIG. 1 is led out, where J=K+1.

[0056] In this way, the arrangement of two parallel branches in each phase winding is achieved.

[0057] Optionally, combined Figure 3 , Figure 4 and Figure 5 As shown, the number of stator slots 11 is N=72, the number of pole pairs is P=12, the number of layers of stator slots is M=6, and the 1st to 6th layers of the stator slots 11 from the inside to the outside are recorded as a to f layers, and xy is defined as the yth layer of the xth stator slot, x∈[1,72], y∈[a,f];

[0058] The winding connection routes in the first branch U1 of the U-phase winding are as follows: 2a→7b→14a→19b→26a→31b→38a→43b→50a→55b→62a→67b→2c→7d→14c→19d→26c→31d→38c→43d→50c→55d→62c→67d→2e→7f→14e→19f→26e→31f→38e→43f→50e→ 55f→62e→67f→2f→69e→62f→57e→50f→45e→38f→33e→26f→21e→14f→9e→2d→69c→62d→57c→50d→45c→38d→33c→26d→21c→14d→9c→2b→69a→62b→57a→50b→45a→38b→33a→26b→21a→14b→9a;

[0059] The winding connection route in the second branch U2 of the U-phase winding is as follows: 3a→8b→15a→20b→27a→32b→39a→44b→51a→56b→63a→68b→3c→8d→15c→20d→27c→32d→39c→44d→51c→56d→63c→68d→3e→8f→15e→20f→27e→32f→39e→44f→51e→ 56f→63e→68f→1f→68e→61f→56e→49f→44e→37f→32e→25f→20e→13f→8e→1d→68c→61d→56c→49d→44c→37d→32c→25d→20c→13d→8c→1b→68a→61b→56a→49b→44a→37b→32a→25b→20a→13b→8a.

[0060] Among them, 2a represents the ath layer of the second stator slot, that is, the first branch U1 of the U-phase winding is wound from the ath layer of the second stator slot. Similarly, it can be seen that the second branch U2 of the U-phase winding is wound from the ath layer of the third stator slot.

[0061] In this way, a U-phase winding arrangement of 72 slots, 12 poles, 2 branches and 6 layers is achieved.

[0062] 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 Figure 6 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 a-th layer of the 10th stator slot, the second branch V2 of the V-phase winding is wound from the a-th layer of the 11th stator slot, the first branch W1 of the W-phase winding is wound from the a-th layer of the 18th stator slot, and the second branch W2 of the W-phase winding is wound from the a-th layer of the 19th stator slot.

[0063] Optionally, combined Figure 2 , Figure 7 , Figure 8 and Fig. 9 As shown, the first winding segment and the second winding segment each include a first coil 23 and a plurality of second coils 24 connected in series in sequence, the first coil 23 is a single coil and is located at the first layer of the stator slot 11, and the second coil 24 is a stacked U-shaped coil; and / or, the connecting segment includes a third coil 25, and the third coil 25 is a stacked U-shaped coil.

[0064] In this optional embodiment, the first winding section and the second winding section are both formed by a single coil and a plurality of stacked U-shaped coils connected in series in sequence, and the first winding section and the second winding section are connected in series through a stacked U-shaped coil, and the head end of the first winding section and the tail end of the second winding section are a single coil. This arrangement facilitates winding using the prefabricated single coil and the stacked U-shaped coil, thereby improving winding efficiency.

[0065] Furthermore, combined with Figure 7 As shown, the first coil 23 includes a first coil body 231 and a first bent portion 232. The first coil body 231 includes a first slot portion 2311 for being inserted into the stator slot 11 and a lead portion 2312 for wiring. The lead portion 2312 and the first bent portion 232 are respectively connected to the two ends of the first slot portion 2311. The first bent portion 232 is bent along the circumferential direction of the stator core 1 in a direction away from the first slot portion 2311 to form a welding end 22. In this way, by providing the first bent portion 232 at one end of the first coil body 231 of the first coil 23, it is convenient to weld with the second coil 24 to achieve series connection.

[0066] Furthermore, combined with Figure 8 As shown, the second coil 24 includes a second coil body 241 and a second bend 242. The second coil body 241 includes two second slots 2411 parallel to each other and a first connection portion 2412 connecting one end of the two second slots 2411. The two second slots 2411 are respectively inserted into two stator slots 11 located in two adjacent slot layers and having a span of n. The other ends of the two second slots 2411 are respectively connected to second bends 242. The two second bends 242 are bent in the circumferential direction of the stator core 1 in a direction away from the second slots 2411 to form a welding end 22, and the bending directions of the two second bends 242 are opposite. In this way, by providing the second bends 242 at both ends of the second coil body 241 of the second coil 24, the second bends 242 of the two adjacent second coils 24 are welded to realize series connection. Moreover, the two second bends 242 are bent in opposite directions to facilitate winding along the circumferential direction and spanning to the next slot layer.

[0067] Furthermore, combined with Fig. 9 As shown, the third coil 25 includes a third coil body 251 and a third bending portion 252. The third coil body 251 includes two third slot portions 2511 parallel to each other and a second connecting portion 2512 connecting one end of the two third slot portions 2511. The two third slot portions 2511 are respectively penetrated in two stator slots 11 located at the Mth layer and with a span of q. The other ends of the two third slot portions 2511 are respectively connected to the third bending portions 252. The two third bending portions 252 are bent along the circumferential direction of the stator core 1 toward a direction away from the third slot portions 2511 to form a welding end 22, and the bending directions of the two third bending portions 252 are the same. In this way, by setting the third bending portions 252 at both ends of the third coil body 251 of the third coil 25, the two third bending portions 252 of the third coil 25 are welded to the second coil 24 of the first winding segment and the second coil 24 of the second winding segment respectively to achieve series connection, and the two third bending portions 252 are bent in the same direction so that the second winding segment is arranged adjacent to the first winding segment, ensuring that each parallel branch is distributed in a ring-shaped symmetrical structure in the stator slot 11.

[0068] An embodiment of the present invention provides a flat wire motor, comprising the flat wire winding stator as described above.

[0069] 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 winding stator described above, and will not be described in detail here.

[0070] A vehicle provided by an embodiment of the present invention includes the flat wire winding stator as described above, or includes the flat wire motor as described above.

[0071] The beneficial effects of the vehicle of this embodiment relative to the prior art are the same as those of the flat wire winding stator described above, and will not be described in detail here.

[0072] 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 winding 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, each of the stator slots (11) is provided with M slot layers for winding wires along the radial direction of the stator core (1), and the flat wire winding stator is used for a 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) extends out of the stator slot (11) at both ends of the axial direction of the stator core (1) to form a crown end (21) and a welding end (22); the lead wire of the stator winding (2) is located at the crown end (21); and the span of the stator winding (2) at the welding end (22) is m, and the span at the crown end (21) is n, wherein m=N / P-1, and n=N / P+1.

2. The flat wire winding stator according to claim 1, characterized in that: The stator winding (2) comprises a multi-phase winding, each of which comprises a plurality of parallel branches, wherein the branches comprise a first winding section, a connecting section and a second winding section, wherein the first winding section is introduced from the first layer of the stator slot at the crown end (21), and is wound alternately in two adjacent slot layers along the circumference of the stator core (1) in a first direction for one turn, and then is crossed to the next adjacent slot layers for one turn, until the first winding section is wound M / 2 turns and wound to the Mth layer, wherein the connecting section connects the tail end of the first winding section at the Mth layer with the head end of the second winding section at the Mth layer with a span q, wherein the second winding section is wound alternately in two adjacent slot layers along the circumference of the stator core (1) in a second direction for one turn, and then is crossed to the next adjacent slot layers for one turn, until the second winding section is wound M / 2 turns and wound to the first layer and led out from the crown end (21), wherein the first direction and the second direction are opposite.

3. The flat wire winding stator according to claim 2, characterized in that: Each of the phase windings includes a first branch and a second branch connected in parallel, the span of the connecting section in the first branch is q=n, and the span of the connecting section in the second branch is q=m.

4. The flat wire winding 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 winding stator according to claim 2, characterized in that: The first layer of the stator slots (11) is the innermost slot layer of the stator slots (11), and the Mth layer of the stator slots (11) is the outermost slot layer of the stator slots (11).

6. The flat wire winding stator according to claim 3, 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 is offset by K+N / P slots in the first direction to obtain the V-phase winding, and the V-phase winding is offset by K+N / P slots in the first direction to obtain the W-phase winding; or, the U-phase winding is offset by K+N / P slots in the second direction to obtain the V-phase winding, and the V-phase winding is offset by K+N / P slots in the second direction to obtain the W-phase winding, wherein K is the slot number of the head end of the first winding segment of the first branch in the U-phase winding.

7. The flat wire winding stator according to claim 6, characterized in that: The number of stator slots (11) is N=72, the number of pole pairs is P=12, the number of layers of the stator slots (11) is M=6, the 1st to 6th layers of the stator slots (11) from the inside to the outside are recorded as a to f layers, and xy is defined as the yth layer of the xth stator slot, x∈[1,72], y∈[a,f]; The winding connection route in the first branch of the U-phase winding is as follows: 2a→7b→14a→19b→26a→31b→38a→43b→50a→55b→62a→67b→2c→7d→14c→19d→26c→31d→38c→43d→50c→55d→62c→67d→2e→7f→14e→19f→26e→31f→38e→43f→50e→ 55f→62e→67f→2f→69e→62f→57e→50f→45e→38f→33e→26f→21e→14f→9e→2d→69c→62d→57c→50d→45c→38d→33c→26d→21c→14d→9c→2b→69a→62b→57a→50b→45a→38b→33a→26b→21a→14b→9a; The winding connection route in the second branch of the U-phase winding is as follows: 3a→8b→15a→20b→27a→32b→39a→44b→51a→56b→63a→68b→3c→8d→15c→20d→27c→32d→39c→44d→51c→56d→63c→68d→3e→8f→15e→20f→27e→32f→39e→44f→51e→ 56f→63e→68f→1f→68e→61f→56e→49f→44e→37f→32e→25f→20e→13f→8e→1d→68c→61d→56c→49d→44c→37d→32c→25d→20c→13d→8c→1b→68a→61b→56a→49b→44a→37b→32a→25b→20a→13b→8a.

8. The flat wire winding stator according to claim 2, characterized in that: The first winding section and the second winding section each comprise a first coil (23) and a plurality of second coils (24) which are sequentially connected in series, the first coil (23) being a single coil and being located at the first layer of the stator slot (11), and the second coil (24) being a stacked U-shaped coil; And / or, the connecting section comprises a third coil (25), and the third coil (25) is a stacked U-shaped coil.

9. A flat wire motor, characterized in that: The invention comprises a flat wire winding stator as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: It comprises the flat wire winding 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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