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 stator grooves, and the flat wire motor stator is used for the flat wire motor with the number of the stator grooves being N and the number of pole pairs being P; the stator winding comprises a plurality of phase windings, each phase winding comprises a plurality of parallel branches, each branch is formed by alternately connecting a plurality of different-layer hairpin coils with spans of N / P-1 and N / P + 1, the different-layer hairpin coils are arranged between two adjacent slot layers of the stator slot in a crossing manner, and the span between the two adjacent different-layer hairpin coils is N / P. Therefore, the stator winding is not provided with the same layer of coils at the crown end, is arranged in a short-distance and long-distance alternating manner, and is arranged in a whole-distance manner at the welding end, so that the radial and axial sizes of the crown end of the stator winding can be reduced, the copper consumption and resistance of the winding are reduced, the production cost of the winding 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] At present, motor stator windings are mainly divided into round wire windings and flat wire windings. Among them, motors using round wire windings are called round wire motors, and motors using flat wire windings are called flat wire motors. Compared with round wire windings, flat wire windings can effectively increase the motor slot fill rate, reduce motor copper loss, and thus improve motor efficiency. Therefore, more and more new energy vehicles use flat wire motors in the drive system to increase the range of new energy vehicles.

[0003] However, in the related art, the flat wire stator winding is usually wound with a full-pitch hairpin coil, which results in a larger radial and axial space at the crown end of the flat wire winding, and increases the cost and resistance of the flat wire winding, resulting in limited improvement in motor efficiency. In addition, the design method of the flat wire stator winding is not flexible enough and has poor adaptability, which makes it difficult to design parallel branches with different numbers of branches according to needs, which has certain limitations. Summary of the invention

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

[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 connecting a plurality of two types of heterogeneous hairpin coils with spans m and n in series, the heterogeneous hairpin coils are arranged between two adjacent slot layers of the stator slot, and the heterogeneous hairpin coils with a span of m and the heterogeneous hairpin coils with a span of n are arranged alternately, and the span between two adjacent heterogeneous hairpin coils is q; wherein, m=N / P-1, n=N / P+1, q=N / P.

[0008] Optionally, the branch includes a first winding unit and a second winding unit connected in series, the first winding unit and the second winding unit both include L / 2 of the different-layer hairpin coils with a span of m and L / 2 of the different-layer hairpin coils with a span of n, the first winding unit is introduced from the first layer of the stator slot with the different-layer hairpin coils with a span of n as the winding starting point, and is alternately wound one circle in the first layer and the second layer along the circumference of the stator core in a first direction, and then spans to the next two adjacent slot layers and alternately winds one circle, until the first winding unit is The first winding unit is wound M / 2 times and then wound to the Mth layer of the stator slot; the second winding unit uses the different-layer hairpin coil with a span of m as the head end of the second winding unit and is connected to the tail end of the first winding unit in the same layer in the Mth layer, and is alternately wound one turn in the Mth layer and the M-1th layer in the second direction along the circumference of the stator core, and then spans to the next two adjacent slot layers and alternately winds one turn, until the second winding unit is wound M / 2 times and then wound to the 1st layer for leading out; wherein, L=P*M / 4, and the first direction is opposite to the second direction.

[0009] Optionally, the L different-layer hairpin coils in the first winding unit are all first hairpin coils, the first hairpin coil comprises a first coil body and a first bending portion, the first coil body comprises two mutually parallel first slotted portions and a first connecting portion connecting one end of the two first slotted portions, the two first slotted portions of the different-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 slotted portions of the different-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 slotted portions are respectively connected to the first bending portions, the two first bending portions are respectively bent along the circumferential direction of the stator core, and the bending directions of the two first bending portions are opposite;

[0010] And / or, among the L different-layer hairpin coils of the second winding unit, one different-layer hairpin coil is the second hairpin coil, L-1 different-layer hairpin coils are the first hairpin coil, and the second hairpin coil is connected to the tail end of the first winding unit; the second 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 m, the other ends of the two second slot portions are respectively connected to the second bending portions, the two second bending portions are bent along the circumferential direction of the stator core, and the bending directions of the two second bending portions are the same.

[0011] Optionally, the lead wires of the phase winding of each phase are located in the innermost slot layer of the stator slots.

[0012] 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, the span n=7, and the span q=6.

[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 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∈[1,72], y∈[a,f];

[0014] Each phase winding comprises a first branch and a second branch;

[0015] The winding connection route in the first branch of the phase winding of one phase is as follows: 5a→12b→18a→23b→29a→36b→42a→47b→53a→60b→66a→71b→5c→12d→18c→23d→29c→36d→42c→47d→53c→60d→66c→71d→5e→12f→18e→23f→29e→36f→42e→47f →53e→60f→66e→71f→5f→72e→66f→59e→53f→48e→42f→35e→29f→24e→18f→11e→5d→72c→66d→59c→53d→48c→42d→35c→29d→24c→18d→11c→5b→72a→66b→59a→53b→48a→42b→35a→29b→24a→18b →11a; and the winding connection route of the second branch is: 6a→11b→17a→24b→30a→35b→41a→48b→54a→59b→65a→72b→6c→11d→17c→24d→30c→35d→41c→48d→54c→59d→65c→72d→6e→11f→17e→24f→30e→35f→41e→48f→54e→ 59f→65e→72f→6f→71e→65f→60e→54f→47e→41f→36e→30f→23e→17f→12e→6d→71c→65d→60c→54d→47c→41d→36c→30d→23c→17d→12c→6b→71a→65b→60a→54b→47a→41b→36a→30b→23a→17b→12a.

[0016] 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].

[0017] Optionally, the lead wire of the U-phase winding is separated from the lead wire of the V-phase winding by 4 slot numbers, the lead wire of the W-phase winding is separated from the lead wire of the V-phase winding by 4 slot numbers, and the lead wires of the U-phase winding, the V-phase winding and the W-phase winding form a star connection.

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

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

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

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

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

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

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

[0025] Figure 5 It is a structural schematic diagram of a second hairpin coil in an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the connection route of the first branch U1 and the second branch U2 of the U-phase winding of the 72-slot 12-pole 6-layer 2-branch flat wire motor in an embodiment of the present invention;

[0027] Figure 7Schematic diagram of the winding distribution of the first branch U1 of the U-phase winding of the 72-slot 12-pole 6-layer 2-branch flat wire motor in an embodiment of the present invention;

[0028] Figure 8 Schematic diagram of the winding distribution of the U-phase winding of the 72-slot 12-pole 6-layer 2-branch flat wire motor in an embodiment of the present invention;

[0029] Fig. 9 Schematic diagram of the winding distribution of the three-phase winding of the stator winding of the 72-slot 12-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. Different-layer hairpin coil; 131. First hairpin coil; 1311. First coil body; 1311a. First slot part; 1311b. First connecting part; 1312. First bending part; 132. Second hairpin coil; 1321. Second coil body; 1321a. Second slot part; 1321b. Second connecting part; 1322. Second bending part; 2. Stator core; 21. Stator slot. 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, the flat wire stator winding is usually wound with a full-pitch hairpin coil, which results in a larger radial and axial space at the crown end of the flat wire winding, and increases the cost and resistance of the flat wire winding, resulting in limited improvement in motor efficiency. In addition, the design method of the flat wire stator winding is not flexible enough and has poor adaptability, which makes it difficult to design parallel branches with different numbers of branches according to needs, 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 composed of a plurality of two types of heterogeneous card-hairpin coils 13 with spans m and n respectively connected in series, the heterogeneous card-hairpin coils 13 are arranged between two adjacent slot layers of the stator slot 21, and the heterogeneous card-hairpin coils 13 with a span of m and the heterogeneous card-hairpin coils 13 with a span of n are arranged alternately, and the span between two adjacent heterogeneous card-hairpin coils 13 is q; wherein, m=N / P-1, n=N / P+1, q=N / P.

[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 different-layer hairpin coils 13, each of which is arranged between two adjacent slot layers of the stator slot 21 and occupies different slot layers. Moreover, all two adjacent different-layer 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.

[0040] More specifically, in the current direction, the span between two adjacent different-layer hairpin coils 13 is q=N / P, and the different-layer hairpin coils 13 have two spans of m and n, wherein the different-layer hairpin coils 13 with a span of m and the different-layer hairpin coils 13 with a span of n are alternately connected. The span of the crown end 11 is the span of the different-layer hairpin coils 13, and the span of the welding end 12 is the span between two adjacent different-layer hairpin coils 13, that is, the stator winding 1 has two spans of N / P-1 and N / P+1 at the crown end 11, and the span at the welding end 12 is N / P, that is, the stator winding 1 is arranged in the form of alternating short and long spans at the crown end 11, and in the form of full spans at the welding end 12, and there is no same-layer coil at the crown end 11, that is, the two effective sides of the hairpin coil (that is, the part of the coil that passes through the stator slot 21) are arranged in different slot layers. Among them, the span of the different-layer 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 different-layer 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 different-layer hairpin coils 13 in the stator slots 21 to form a stator winding 1; by alternately connecting a plurality of different-layer hairpin coils 13 with a span of m and a plurality of different-layer hairpin coils 13 with a span of n in each branch, and making each different-layer hairpin coil 13 span between two adjacent slot layers of the stator slot 21, so that, for example, the crown end 11 of the stator winding 1 has no coils of the same layer; at the same time, by The span m is set to be equal to N / P-1, the span n is set to be equal to N / P+1, and the span q between two adjacent different-layer hairpin coils 13 is set to be equal to N / P, so that the span of the stator winding 1 at the crown end 11 is N / P-1 and N / P+1, and the span at the welding end 12 is N / P, that is, the stator winding 1 is arranged in the form of alternating short and long spans at the crown end 11, and arranged in the form of full spans at the welding end 12, so as to ensure that the coils of the flat wire winding are evenly distributed. In this way, the stator winding 1 has no coils of the same layer at the crown end 11 and is arranged in the form of alternating short and long spans, and is arranged in the form of full spans at the welding end 12, which not only makes the winding method of the flat wire stator winding more flexible and can be applied to winding schemes with different branch numbers, but also can reduce the radial and axial dimensions of the crown end 11 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. In addition, the different-layer hairpin coil 13 is usually a prefabricated stacked U-shaped coil, and the use of the prefabricated stacked U-shaped coil for winding can improve the winding efficiency and convenience.

[0042] Optionally, combined Figure 2 , Figure 6 and Figure 7 As shown, the branch includes a first winding unit and a second winding unit connected in series, and the first winding unit and the second winding unit both include L / 2 different-layer hairpin coils 13 with a span of m and L / 2 different-layer hairpin coils 13 with a span of n. The first winding unit is introduced from the first layer of the stator slot 21 with the different-layer hairpin coils 13 with a span of n as the winding starting point, and is alternately wound in the first layer and the second layer along the circumference of the stator core 2 in a first direction, and then spans to the next two adjacent slot layers and alternately winds one circle, until the first winding unit is wound. After M / 2 turns, the second winding unit is wound to the Mth layer of the stator slot 21. The second winding unit uses the different-layer hairpin coil 13 with a span of m as the head end of the second winding unit, which is connected to the tail end of the first winding unit in the same layer at the Mth layer, and is alternately wound one turn in the Mth layer and the M-1th layer in the second direction along the circumference of the stator core 2, and then spans to the next two adjacent slot layers and alternately winds one turn, until the second winding unit is wound M / 2 turns and then wound to the 1st layer for leading out; wherein, L=P*M / 4, and the first direction is opposite to the second direction.

[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, each branch is composed of two first winding units and second winding units connected in series, wherein the first winding unit is formed by L / 2 different-layer card-hairing coils 13 with a span of m and L / 2 different-layer card-hairing coils 13 with a span of n alternately wound in a first direction, and the second winding unit is formed by L / 2 different-layer card-hairing coils 13 with a span of m and L / 2 different-layer card-hairing coils 13 with a span of n alternately wound in a second direction. For the convenience of description, the winding method of the branch is explained here by taking the slot layer number M=6 of the stator slot 21 as an example. After the first winding unit is introduced into the stator core 2 from the first layer of the stator slot 21 with a different-layer hairpin coil 13 with a span of m as the winding starting point, it starts to be wound in a first direction along the circumference of the stator core 2. First, P / 4 different-layer hairpin coils 13 with a span of m and P / 4 different-layer hairpin coils 13 with a span of n are alternately wound in the first layer and the second layer for one circle and then spanned to the third layer. Then, P / 4 different-layer hairpin coils 13 with a span of m and P / 4 different-layer hairpin coils 13 with a span of n are alternately wound in the third layer and the fourth layer for one circle and then spanned to the fifth layer. Finally, P / 4 different-layer hairpin coils 13 with a span of m and P / 4 different-layer hairpin coils 13 with a span of n are alternately wound in the fifth layer and the sixth layer for one circle. The second winding unit is wound in the 6th layer with a hairpin coil 13 of different layers with a span of n as the head end of the second winding unit connected to the tail end of the first winding unit in the 6th layer in the same layer, and then the winding is started in the second direction along the circumference of the stator core 2, firstly, P / 4 hairpin coils 13 of different layers with a span of m and P / 4 hairpin coils 13 of different layers with a span of n are wound alternately in the 6th layer and the 5th layer. After winding, it is laid across the 4th layer, and then P / 4 different-layer hairpin coils 13 with a span of m and P / 4 different-layer hairpin coils 13 with a span of n are wound alternately in the 4th layer and the 3rd layer for one turn and then laid across the 2nd layer, and finally P / 4 different-layer hairpin coils 13 with a span of m and P / 4 different-layer hairpin coils 13 with a span of n are wound alternately in the 2nd layer and the 1st layer for one turn and then laid across the 1st layer and led out from the 1st layer. This winding method makes the M slot layers of any two adjacent stator slots 21 occupied by the two branches of the phase winding have windings distributed, such as Figure 8 That is to say, the phase windings including the two branches only need to be wound in two different adjacent stator slots 21, and the windings in the same stator slot 21 are the same-phase windings.

[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 the potential of each branch is balanced, there is no circulating current, and harmonics are offset, which greatly improves the performance of the motor; at the same time, the phase winding including the two branches only needs to be wound in two different adjacent stator slots 21. 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 motor circulating current and improving the motor performance; moreover, windings are distributed in the M slot layers in any two adjacent stator slots 21 occupied by the two branches of the phase winding, so that the windings in the same stator slot 21 are in-phase windings. In this way, there is no need to place insulating paper in the stator slot 21 to isolate the phase windings of different phases, thereby increasing the copper full rate of the flat wire winding, improving the efficiency of the motor, reducing the temperature rise of the motor, and reducing the insulation cost. In addition, the elimination of insulating paper can also simplify the wire insertion process of the hairpin coil and improve the motor manufacturing efficiency. In addition, the lead wires of each phase winding of the stator winding 1 are all located at the first layer of the stator slot 21, so that a connection method such as star connection can be selected according to needs, thereby improving the flexibility of phase winding connection.

[0046] Optionally, combined Figure 1 As shown, the lead wires of each phase winding are located at the innermost slot layer of the stator slot 21. That is to say, the stator winding 1 leads out from the innermost slot layer of the stator slot 21 at the welding end 12. In this way, the lead wire arrangement of the stator winding 1 is realized; moreover, the stator winding 1 adopts the lead wire leading out from the welding end 12, so that the crown end 11 of the stator winding 1 has no lead wire, which can simplify the structure of the tooling equipment matched with the crown end 11, thereby facilitating the universal design of the tooling equipment matched with the crown end 11.

[0047] 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, the span n=7, and the span q=6.

[0048] 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 full pitch is N / P=6, the span m=5, the span n=7, and the span q=6. In this way, on the one hand, the flat wire motor stator can be suitable for N-slot N / 6-pole motors, such as 48-slot 8-pole motors or 72-slot 12-pole flat wire motors, and on the other hand, it can ensure that the spans of the welding ends 12 of the stator windings 1 of the N-slot N / 6-pole flat wire motors are all full pitches, which is convenient for universal welding tools.

[0049] Optionally, combined Fig. 9As 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.

[0050] It should be noted that Fig. 9 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).

[0051] In one example, when the first branch U1 in the U-phase winding enters the stator core 2 from the a-th layer of the 5th slot, and the second branch U2 enters the stator core 2 from the a-th layer of the 6th slot, the U-phase winding can be offset by 4 slots in a clockwise direction to obtain the V-phase winding, and the V-phase winding can be offset by 4 slots in a clockwise direction to obtain the W-phase winding. At this time, Fig. 9 As shown, the first branch V1 of the V-phase winding enters the stator core 2 from the a-th layer of the 9th slot, and the second branch V2 enters the stator core 2 from the a-th layer of the 10th slot. The first branch W1 of the W-phase winding enters the stator core 2 from the a-th layer of the 13th slot, and the second branch W2 enters the stator core 2 from the a-th layer of the 14th 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 a-th layer of the 1st slot, and the second branch V2 enters the stator core 2 from the a-th layer of the 2nd slot. The first branch W1 of the W-phase winding enters the stator core 2 from the a-th layer of the 69th slot, and the second branch W2 enters the stator core 2 from the a-th layer of the 70th slot.

[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 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.

[0053] Optionally, combined Figure 1 and Fig. 9As shown, the lead wire of the U-phase winding is separated from the lead wire of the V-phase winding by 4 slots, the lead wire of the W-phase winding is separated from the lead wire of the V-phase winding by 4 slots, and the lead wires of the U-phase winding, the V-phase winding and the W-phase winding form a star connection.

[0054] In this optional embodiment, the lead wires of the three phase windings of the U phase winding, the V phase winding and the W phase winding are connected in a star shape, that is, the tails of the two parallel branches of the U phase winding are connected to the tails of the two parallel branches of the V phase winding and the tails of the two parallel branches of the W phase winding, so as to realize the connection of the stator winding 1. In addition, the tail ends of the lead wires of each phase winding are usually separated by 4 slots, that is, separated by the minimum offset slot number, so that the interval between the lead wires of each phase winding is small, which can reduce the size and weight of the wiring copper bar.

[0055] Optionally, combined Figure 3 , Figure 6 and Figure 7 As shown, the number of stator slots 21 N=72, the number of pole pairs P=12, the number of layers of the stator slots 21 M=6, 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∈[1,72], y∈[a,f];

[0056] The phase winding of each phase includes a first branch and a second branch, each branch includes a first winding unit and a second winding unit connected in series, the first winding unit includes M / 2 first winding segments, i.e., three first winding segments, and the second winding unit includes M / 2 second winding segments, i.e., three second winding segments.

[0057] Take the U-phase winding as an example. Figure 7 As shown, the winding path of the first branch U1 of the U-phase winding is: the first first winding section of the first winding unit is connected from the ath layer Kth slot (for example Figure 7 and Figure 8 After the 5th slot of the ath layer (shown in FIG. 1 ) enters the stator core 2, it crosses to the K+nth slot of the bth layer (e.g. Figure 7 and Figure 8 ), and then crosses to the K+n+qth groove of the ath layer (e.g. Figure 7 and Figure 8 ), and crosses to the K+n+q+mth groove of the bth layer at the crown end 11 (e.g. Figure 7 and Figure 8 ), and crosses to the K+n+2q+mth groove of the ath layer (e.g., the 23rd groove of the bth layer shown in FIG. 1 ) at the welding end 12. Figure 7 and Figure 8 ), and crosses to the K+2n+2q+mth groove of the bth layer at the crown end 11 (e.g. Figure 7 and Figure 8 ), and crosses to the K+2n+3q+m groove of the a-th layer (e.g., the 36th groove of the b-th layer shown in FIG. 1 ) at the welding end 12. Figure 7 and Figure 8 ), and crosses to the K+2n+3q+2m groove of the b layer at the crown end 11 (e.g. Figure 7 and Figure 8 ), and crosses to the K+2n+4q+2m groove of the a-th layer (e.g., the 47th groove of the b-th layer shown in FIG. 1 ) at the welding end 12. Figure 7 and Figure 8 ), and so on, until the crown end 11 crosses to the K+3n+5q+3m groove of the b layer (for example Figure 7 and Figure 8 After the second first winding segment is connected to the tail end of the first first winding segment, it is wound one turn on the cth layer and the dth layer according to the above rules. After the third first winding segment is connected to the tail end of the second first winding segment, it is wound one turn on the eth layer and the fth layer according to the above rules. In this way, the winding of the first winding unit is completed; after the second winding unit is connected to the tail end of the first winding unit, the first second winding segment of the second winding unit is wound from the welding end 12 to the Kth slot of the fth layer (for example Figure 7 and Figure 8 The stator core 2 is connected to the fifth slot of the fth layer in the stator core 2, and the crown end 11 crosses to the K+Nmth slot of the eth layer (for example Figure 7 and Figure 8 72nd slot of the e-th layer), and crosses to the K+Nmqth slot of the f-th layer at the welding end 12 (e.g. Figure 7 and Figure 8 66th slot of the fth layer in the crown end 11, then cross to the K+Nmqnth slot of the eth layer (e.g. Figure 7 and Figure 8 The 59th groove of the e-th layer) is crossed to the K+Nm-2q-n groove of the f-th layer at the welding end 12 (for example Figure 7 and Figure 8 The 53rd slot of the fth layer in the crown end 11 spans to the K+N-2m-2q-n slot of the eth layer (e.g. Figure 7 and Figure 8 The 48th groove of the e-th layer) is crossed to the K+N-2m-3q-n groove of the f-th layer at the welding end 12 (for example Figure 7 and Figure 8 The 42nd slot of the fth layer in the crown end 11 crosses to the K+N-2m-3q-2n slot of the eth layer (e.g. Figure 7 and Figure 8 The 35th groove of the e-th layer) is crossed to the K+N-2m-4q-2n groove of the f-th layer at the welding end 12 (for example Figure 7and Figure 8 29th slot of the fth layer in the crown), and so on, until the crown end 11 crosses to the K+N-3n-5q-3m slot of the eth layer (for example Figure 7 and Figure 8 After the second second winding segment is connected to the tail end of the first second winding segment, it is wound once on the d and c layers according to the above rules. After the third second winding segment is connected to the tail end of the second second winding segment, it is wound once on the b and a layers according to the above rules. At the welding end 12, it is wound once on the k+n-3n-5q-3m slot (i.e., Figure 7 and Figure 8 In this way, the winding of the second winding unit is completed, and then the winding of the first branch U1 of the U-phase winding is completed.

[0058] The second branch U2 of the U-phase winding is connected from the a-th layer and the K+1-th slot (for example Figure 7 and Figure 8 The ath layer and the 6th slot as shown in FIG. 1 ) enter the stator core 2, and the winding rule of the second branch U2 is the same as that of the first branch U1, which will not be repeated here.

[0059] In this way, the arrangement of two parallel branches in each phase winding is achieved.

[0060] Optionally, combined Figure 3 , Figure 6 and Figure 7 As shown, the number of stator slots 21 N=72, the number of pole pairs P=12, the number of layers of the stator slots 21 M=6, 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∈[1,72], y∈[a,f];

[0061] Each phase winding comprises a first branch and a second branch;

[0062] The winding connection route in the first branch of the phase winding of one phase is: 5a→12b→18a→23b→29a→36b→42a→47b→53a→60b→66a→71b→5c→12d→18c→23d→29c→36d→42c→47d→53c→60d→66c→71d→5e→12f→18e→23f→29e→36f→42e→47f→ 53e→60f→66e→71f→5f→72e→66f→59e→53f→48e→42f→35e→29f→24e→18f→11e→5d→72c→66d→59c→53d→48c→42d→35c→29d→24c→18d→11c→5b→72a→66b→59a→53b→48a→42b→35a→29b→24a→18b →11a; and the winding connection route of the second branch is: 6a→11b→17a→24b→30a→35b→41a→48b→54a→59b→65a→72b→6c→11d→17c→24d→30c→35d→41c→48d→54c→59d→65c→72d→6e→11f→17e→24f→30e→35f→41e→48f→54e→5 9f→65e→72f→6f→71e→65f→60e→54f→47e→41f→36e→30f→23e→17f→12e→6d→71c→65d→60c→54d→47c→41d→36c→30d→23c→17d→12c→6b→71a→65b→60a→54b→47a→41b→36a→30b→23a→17b→12a.

[0063] In this optional embodiment, 5a represents the ath layer of the 5th stator slot, taking the U-phase winding as an example, Figure 7 As shown, the first branch U1 of the U-phase winding is wound from the a-th layer of the 5th stator slot. Similarly, the second branch U2 of the U-phase winding is wound from the a-th layer of the 6th stator slot. The two branches of the phase winding are wound respectively according to the above winding connection route to realize the phase winding arrangement of 72 slots, 12 poles, 2 branches and 6 layers.

[0064] 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. 9The 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 9th stator slot, the second branch V2 of the V-phase winding is wound from the a-th layer of the 10th stator slot, the first branch W1 of the W-phase winding is wound from the a-th layer of the 13th stator slot, and the second branch W2 of the W-phase winding is wound from the a-th layer of the 14th stator slot.

[0065] Optionally, combined Figure 4 As shown, the L different-layer hairpin coils 13 in the first winding unit are all first hairpin coils 131, the first 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 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 different-layer hairpin coil 13 with a span of m are respectively penetrated in two adjacent layers of two stator slots 21 with a span of m, the two first through-slot portions 1311a of the different-layer hairpin coil 13 with a span of n are respectively penetrated in two adjacent layers of two stator slots 21 with a span of n, the other ends of the two first through-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 opposite.

[0066] In this way, by setting the first bending portions 1312 at both ends of the first coil body 1311 of the first hairpin coil 131, it is convenient to weld the first bending portions 1312 of two adjacent different-layer hairpin coils 13 in the first winding unit to achieve series connection, and the two first bending portions 1312 of the first hairpin coil 131 are bent in opposite directions along the circumference of the stator core 2 to facilitate winding the wire along the circumference and crossing to the next slot layer.

[0067] Optionally, combined Figure 5 As shown, among the L different-layer hairpin coils 13 of the second winding unit, one different-layer hairpin coil 13 is a second hairpin coil 132, and L-1 different-layer hairpin coils 13 are first hairpin coils 131, and the second hairpin coil 132 is connected to the tail end of the first winding unit; the second hairpin coil 132 includes a second coil body 1321 and a second bending portion 1322, the second coil body 1321 includes 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, the two second slotted portions 1321a are respectively penetrated in two adjacent layers of two stator slots 21 with a span of m, the other ends of the two second slotted portions 1321a are respectively connected to the second bending portions 1322, the two second bending portions 1322 are bent along the circumferential direction of the stator core 2, and the bending directions of the two second bending portions 1322 are the same.

[0068] In this way, by setting the second bending portions 1322 at the two ends of the second coil body 1321 of the second clip coil 132, the two second bending portions 1322 of the second clip coil 132 are welded to the first clip coil 131 of the first winding unit and the first clip coil 131 of the second winding unit respectively to achieve series connection, and the two second bending portions 1322 of the second clip coil 132 are bent in the same direction to facilitate the reverse winding of the second winding unit. At the same time, the second winding unit is arranged adjacent to the first winding unit to ensure that each parallel branch is distributed in a ring-shaped symmetrical structure in the stator slot 21.

[0069] An embodiment of the present invention provides a flat wire motor, comprising the flat wire motor stator as described above.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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 connecting a plurality of two types of heterogeneous card-hairpin coils (13) with spans m and n respectively in series, the heterogeneous card-hairpin coils (13) are arranged between two adjacent slot layers of the stator slot (21), and the heterogeneous card-hairpin coils (13) with a span of m and the heterogeneous card-hairpin coils (13) with a span of n are arranged alternately, and the span between two adjacent heterogeneous card-hairpin coils (13) is q; wherein m=N / P-1, n=N / P+1, and q=N / P.

2. The flat wire motor stator according to claim 1, characterized in that: The branch comprises a first winding unit and a second winding unit connected in series, the first winding unit and the second winding unit both comprising L / 2 of the said different-layer hairpin coils (13) with a span of m and L / 2 of the said different-layer hairpin coils (13) with a span of n, the first winding unit is introduced from the first layer of the stator slot (21) with the said different-layer hairpin coils (13) with a span of n as a winding starting point, and is alternately wound one circle in the first layer and the second layer along the circumference of the stator core (2) in a first direction, and then is crossed to the next two adjacent slot layers and alternately wound one circle, until the first winding unit is The group unit is wound M / 2 times and then wound to the Mth layer of the stator slot (21); the second winding unit uses the different-layer hairpin coil (13) with a span of m as the head end of the second winding unit and is connected to the tail end of the first winding unit in the same layer in the Mth layer, and is alternately wound one turn in the Mth layer and the M-1th layer in the second direction along the circumference of the stator core (2) and then spans to the next two adjacent slot layers and alternately winds one turn, until the second winding unit is wound M / 2 times and then wound to the 1st layer for extraction; wherein L=P*M / 4, and the first direction and the second direction are opposite.

3. The flat wire motor stator according to claim 2, characterized in that: The L different-layer hairpin coils (13) in the first winding unit are all first hairpin coils (131), the first hairpin coil (131) comprising a first coil body (1311) and a first bending portion (1312), the first coil body (1311) comprising 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 different-layer hairpin coil (13) with a span of m being respectively The first through-slot portions (1311a) of the different-layer hairpin coil (13) with a span of n are respectively arranged in two adjacent layers of the two stator slots (21) with a span of m, and the other ends of the two first through-slot portions (1311a) are respectively connected to the first bending portions (1312), and 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 opposite; And / or, among the L different-layer hairpin coils (13) of the second winding unit, one different-layer hairpin coil (13) is a second hairpin coil (132), L-1 different-layer hairpin coils (13) are the first hairpin coil (131), and the second hairpin coil (132) is connected to the tail end of the first winding unit; the second hairpin coil (132) comprises a second coil body (1321) and a second bending portion (1322), and the second coil body (1321) comprises two second threading portions parallel to each other. A slot portion (1321a) and a second connecting portion (1321b) connecting one end of 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 m, 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 bent along the circumferential direction of the stator core (2), and the bending directions of the two second bending portions (1322) are the same.

4. The flat wire motor stator according to claim 1, characterized in that: The lead-out wires of the phase winding of each phase are located in the innermost slot layer of the stator slot (21).

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, the span n=7, and the span q=6.

6. The flat wire motor stator according to claim 1, characterized in that: The number of stator slots (21) is N=72, the number of pole pairs is P=12, the number of layers of the stator slots (21) is M=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∈[1,72], 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: 5a→12b→18a→23b→29a→36b→42a→47b→53a→60b→66a→71b→5c→12d→18c→23d→29c→36d→42c→47d→53c→60d→66c→71d→5e→12f→18e→23f→29e→36f→42e→47f →53e→60f→66e→71f→5f→72e→66f→59e→53f→48e→42f→35e→29f→24e→18f→11e→5d→72c→66d→59c→53d→48c→42d→35c→29d→24c→18d→11c→5b→72a→66b→59a→53b→48a→42b→35a→29b→24a→18b →11a; and the winding connection route of the second branch is: 6a→11b→17a→24b→30a→35b→41a→48b→54a→59b→65a→72b→6c→11d→17c→24d→30c→35d→41c→48d→54c→59d→65c→72d→6e→11f→17e→24f→30e→35f→41e→48f→54e→ 59f→65e→72f→6f→71e→65f→60e→54f→47e→41f→36e→30f→23e→17f→12e→6d→71c→65d→60c→54d→47c→41d→36c→30d→23c→17d→12c→6b→71a→65b→60a→54b→47a→41b→36a→30b→23a→17b→12a.

7. 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].

8. The flat wire motor stator according to claim 7, characterized in that: The lead wire of the U-phase winding is separated from the lead wire of the V-phase winding by 4 slots, the lead wire of the W-phase winding is separated from the lead wire of the V-phase winding by 4 slots, and the lead wires of the U-phase winding, the V-phase winding and the W-phase winding form a star connection.

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.

Images