Flat wire winding stator, flat wire motor and vehicle

Abstract

The application 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 in the circumferential direction. Each stator slot is provided with M layers of slot layers for winding wire arrangement in the radial direction of the stator core. The flat wire winding stator is used in a motor with N stator slots and P pole pairs, wherein M is an even number greater than or equal to 4. The stator winding extends out of the stator slot in the axial direction of the stator core to form a crown end and a welding end. The lead-out 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. In this way, the structure of the welding tooling equipment can be simplified, the welding tooling cost can be reduced, the size of the welding end in the radial direction and the axial direction can be reduced, the amount of copper used in the winding can be reduced, and the production cost of the winding can be saved.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to a flat wire winding stator, a flat wire motor, and a vehicle. Background Technology

[0002] Stator windings can be divided into round wire windings and flat wire windings. Motors using round wire stator windings are called round wire motors, and motors using flat wire stator windings are called flat wire motors. Because flat wire motors can significantly improve the slot fill factor and motor efficiency, they are increasingly being used in the drive systems of new energy vehicles.

[0003] When winding the stator core, full-pitch wave windings are typically used. For example, taking an 8-layer winding as an example, a hairpin coil with a full-pitch span is used. After winding around the circumference once from the 1st and 2nd layers, it enters the 3rd and 4th layers, then the 5th and 6th layers, and finally, after completing one revolution in the 7th and 8th layers, it winds back from the 8th and 7th layers to the 2nd and 1st layers, and then leads out from the welding end. This winding method, which leads out from the welding end, increases the difficulty of the welding process at 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, using full-pitch winding can easily lead to occupying a large amount of radial and axial space at the winding end, increasing winding cost and resistance, and reducing motor efficiency. Summary of the Invention

[0004] The problem this invention addresses is how to reduce the size of the winding ends and lower the platformization cost of the winding welding ends.

[0005] To address the aforementioned problems, this 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, and each stator slot is provided with M layers of slot layers for winding and wiring along the radial direction of the stator core, wherein the flat wire winding stator is used in a 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 extends from both ends of the stator slot along the axial direction of the stator core to form a crown end and a welded end. The lead wire of the stator winding is located at the crown end, and the span of the stator winding at the welded end is m and the span at the crown end is n, where m = N / P-1 and n = N / P+1.

[0008] Optionally, the stator winding includes multi-phase windings, each phase winding including multiple parallel branches, each branch including a first winding segment, a connecting segment, and a second winding segment. The first winding segment is introduced from the first layer of the stator slot at the crown end, and is wound alternately in two adjacent slot layers in a first direction along the circumference of the stator core, and then crosses over to the next two adjacent slot layers to be wound alternately once, until the first winding segment is wound M / 2 times and then wound to the Mth layer. The connecting segment connects the tail end of the first winding segment to the head end of the second winding segment in the Mth layer with a span q. The second winding segment is wound alternately in two adjacent slot layers in a second direction along the circumference of the stator core, and then crosses over to the next two adjacent slot layers to be wound alternately once, until the second winding segment is wound M / 2 times and then wound to the first layer and led out from the crown end. The first direction and the second direction are opposite.

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

[0010] Optionally, the number of stator slots N 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 slot is the innermost slot layer of the stator slot, and the Mth layer of the stator slot is the outermost slot layer of the stator slot.

[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 where the first 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 stator slot layers M = 6, and the 1st to 6th layers of the stator slots from the inside out are denoted as layers a to f, and xy is defined as the yth layer of the xth stator slot, x∈[1, 72], y∈[a, f];

[0014] The winding connection routes in the first branch 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;

[0015] The winding connection routes in the second branch of the U-phase winding are 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, both the first winding segment and the second winding segment include a first coil and a plurality of second coils connected in series. The first coil is a single coil and is located in the first layer of the stator slot. The second coils are stacked U-shaped coils.

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

[0018] Secondly, the present invention provides a flat wire motor, including a flat wire winding stator as described above.

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

[0020] The beneficial effects of the flat wire winding stator, flat wire motor, and vehicle of the present invention are as follows: By setting N stator slots on the circumferential inner wall of the stator core and winding M layers of flat wire windings in the stator slots to form a stator winding, and setting the lead wires of the stator winding at the crown end of the stator winding, when welding at the welding end after the stator winding is completed, it is not necessary to configure tooling equipment to fix or separate the lead wires. This not only simplifies the welding process and reduces the manufacturing difficulty of the motor, but also simplifies the structure of the welding tooling equipment, reduces the cost of welding tooling, facilitates platform design, and reduces platform costs. In addition, by setting the stator winding span m at the welding end to be equal to N / P-1 and the stator winding span n at the crown end to be equal to N / P+1, the coils of the flat wire winding are evenly distributed. Moreover, the stator winding span at the welding end is short, which reduces the radial and axial dimensions of the welding end, thereby reducing the amount of copper used in 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 conducive to improving the efficiency of the motor. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the flat wire winding stator in an embodiment of the present invention;

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

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

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

[0025] Figure 5 This is a schematic diagram of the winding distribution of the first and second branches of the U-phase winding in an embodiment of the present invention;

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

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

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

[0029] Figure 9 This is a schematic diagram of the structure of the third coil in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Stator core; 11. Stator slot; 112. Slot opening; 2. Stator winding; 21. Crown end; 22. Welding end; 23. First coil; 231. First coil body; 2311. First slot-passing part; 2312. Lead part; 232. First bend part; 24. Second coil; 241. Second coil body; 2411. Second slot-passing part; 2412. First connecting part; 242. Second bend part; 25. Third coil; 251. Third coil body; 2511. Third slot-passing part; 2512. Second connecting part; 252. Third bend part. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0033] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0034] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0035] In related technologies, when winding the stator core, full-pitch wave windings are typically used. For example, taking an 8-layer winding as an example, a hairpin coil with a full-pitch span is used. After winding around the circumference once from the 1st and 2nd layers, it enters the 3rd and 4th layers, then the 5th and 6th layers, and finally, after completing one revolution in the 7th and 8th layers, it winds back from the 8th and 7th layers to the 2nd and 1st layers, and then leads out from the welding end. This winding method, which leads out from the welding end, increases the difficulty of the welding process at 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, using full-pitch winding can easily lead to occupying a large amount of radial and axial space at the winding end, increasing winding cost and resistance, and reducing motor efficiency.

[0036] To address the problems existing in the aforementioned 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 in the figure, an embodiment of the present invention provides a flat wire winding stator, including 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 layers of slots for winding and wiring 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, where M is an even number greater than or equal to 4. The stator winding 2 extends out of the stator slots 11 at both ends along the axial direction of the stator core 1 to form a crown end 21 and a weld 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 weld end 22 is m and the span at the crown end 21 is n, where m = N / P-1 and n = N / P+1.

[0038] Specifically, N stator slots 11 are evenly distributed along the circumference of the stator core 1 on the inner wall of the stator core 1. Furthermore, M slot layers for winding and wiring are provided within each stator slot 11 along the radial direction of the stator core 1. That is, the stator winding 2 is arranged in layers within the stator slots 11, where M is an even number greater than or equal to 4. For example, the number of slot layers M can be 4, 6, or 8. Alternatively, the stator slots 11 can be designated as layers 1 to M from the outside to the inside, or from the inside to the outside. No specific limitation is made here; the appropriate designation can be made based on the specific application. The stator winding 2 is arranged axially within the stator slot 11 along the stator core 1, with both ends of the stator winding 2 extending out of the stator slot 11 to form a crown end 21 and a weld end 22. Furthermore, the lead wires of the stator winding 2 are located at the crown end 21, meaning the stator winding 2 exits from the crown end 21, not the weld end 22. The span of the stator winding 2 at the crown end 21 is n = N / P+1, and the span at the weld end 22 is m = N / P-1. The span refers to the number of slots occupied between two adjacent effective sides of a coil (i.e., the portion of the coil passing through the stator slot 11). When the span equals 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, it is a short span; and when the span is greater than the full span, it is a long span. In other words, the span of stator winding 2 at crown end 21 is the long span, and the span of stator winding 2 at welding end 22 is the short span.

[0039] In this embodiment, the flat wire winding stator 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 stator winding 2. At the same time, the lead wires of stator winding 2 are set at the crown end 21 of stator winding 2. In this way, when welding is performed at the welding end 22 after the stator winding 2 is wound, it is not necessary to configure tooling equipment to fix or separate the lead wires. This not only simplifies the welding process and reduces the manufacturing difficulty of the motor, but also simplifies the structure of welding tooling equipment, reduces the cost of welding tooling, facilitates platform design and reduces platform costs. 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 the span n of the stator winding 2 at the crown end 21 to be equal to N / P+1, the coils of the flat wire winding are evenly distributed. Moreover, the span of the stator winding 2 at the welding end 22 is short. This reduces the radial and axial dimensions of the welding end 22, thereby reducing the amount of copper used in the winding and saving the production cost of the winding. At the same time, it also reduces the resistance of the winding itself, which is conducive to improving the efficiency of the motor.

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

[0041] In this optional embodiment, the innermost slot layer of stator slot 11 refers to the slot layer located at the bottom of stator slot 11, and the outermost slot layer of stator slot 11 refers to the slot layer located at the opening of stator slot 11. That is, stator slot 11 is denoted as layer 1 to layer M from the inside out. In this way, the windings of each branch can start winding from the bottom of stator slot 11, so that the bottom and sidewalls of stator slot 11 can be used to limit the windings and prevent the windings from coming off the opening of stator slot 11, thereby improving the convenience of winding and ensuring that the windings are evenly distributed in stator slot 11.

[0042] Optionally, combined Figure 4 As shown, the stator winding 2 includes multi-phase windings. Each phase winding includes multiple parallel branches. Each branch includes a first winding segment, a connecting segment, and a second winding segment. The first winding segment is introduced from the first layer of the stator slot 11 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, and then crossed over to the next two adjacent slot layers to be wound alternately for one turn, until the first winding segment is wound M / 2 turns and then wound to the Mth layer. The connecting segment connects the tail end of the first winding segment to the head end of the second winding segment in the Mth layer with a span q. The second winding segment is wound alternately in two adjacent slot layers along the circumference of the stator core 1 in a second direction, and then crossed over to the next two adjacent slot layers to be wound alternately for one turn, until the second winding segment is wound M / 2 turns and then 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 can be clockwise, in which case the second direction is counterclockwise; the first direction can also be counterclockwise, in which case the second direction is clockwise.

[0044] In this optional embodiment, the stator winding 2 may include a two-phase winding or a three-phase winding. Each phase winding may include two parallel branches or three parallel branches, without specific limitation. Each branch consists of a first winding segment, a connecting segment, and a second winding segment, wherein the winding directions of the first winding segment and the second winding segment are opposite. For ease of description, the winding method of the branch is described here using the example of the number of slot layers M=6 in the stator slot 11. The first winding segment is introduced from the first layer of the stator slot 11 at the crown end 21, and is wound alternately once in the first and second layers along the circumference of the stator core 1 in the first direction, then crosses over to the third layer, and alternately once in the third and fourth layers, then crosses over to the fifth layer, and then alternately once in the fifth and sixth layers, then winds to the... Up to the 6th layer, the connecting section connects the tail end of the first winding segment to the head end of the second winding segment in the 6th layer with a span q. The second winding segment is wound alternately in the 6th and 5th layers along the circumference of the stator core 1 in the second direction, then spans to the 4th layer, alternately wound alternately in the 4th and 3rd layers, then spans to the 2nd layer, and then alternately wound alternately in the 2nd and 1st layers, then winds to the 1st layer, and is led out from the crown end 21. In this way, the parallel branches are distributed in a ring-shaped symmetrical structure in the stator slot 11, thereby achieving a uniform and symmetrical distribution of the windings in each phase, making the potential of each branch balanced, eliminating circulating current, canceling harmonics, and greatly improving 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 segment in the first branch is q = n, and the span of the connecting segment in the second branch is q = m.

[0046] In this optional embodiment, taking the number of stator slot layers M=6 as an example, 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 a 3, 6, 3 pattern. Figure 5 As shown, in the three adjacent stator slots 11, the left stator slot 11 has windings distributed in even-numbered layers, the middle stator slot 11 has windings distributed in all six slot layers, and the right stator slot 11 has windings distributed in odd-numbered layers. This ensures that when winding other phase windings by shifting the number of slots, the distribution of each phase winding within the multiple stator slots 11 is completely consistent. Figure 6 As shown, this further reduces motor circulating current and improves motor performance.

[0047] Optionally, the number N of 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 stator slots 11 can be 24, 48, 72, etc., and correspondingly, the number of pole pairs P can be 4, 8, 12, etc., while the pitch is N / P = 6, the span m = 5, and the span n = 7. This allows the flat wire winding stator to be suitable for N-slot N / 6-pole motors, such as a 48-slot 8-pole motor or a 72-slot 12-pole motor. Furthermore, it ensures that the span of the welding ends 22 of the stator windings 2 in N-slot N / 6-pole motors is always 5, facilitating the use of universal welding fixtures.

[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, where K is the slot number of the first winding segment of the first branch in the U-phase winding.

[0050] It should be noted that, Figure 6 There are three different shades of color. The lightest shade represents the distribution area of ​​the two parallel branches of the U-phase winding (i.e., branches U1 and U2), the second darkest shade represents the distribution area of ​​the two parallel branches of the V-phase winding (i.e., branches V1 and V2), and the darkest shade 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 beginning of the first winding segment is located in the second slot, that is, the slot number of the beginning of the first winding segment 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 beginning of the first winding segment is located in the fifth slot, that is, the slot number of the beginning of the first winding segment is 5.

[0052] This allows the V-phase winding to be wound by shifting a certain number of slots clockwise or counterclockwise from the U-phase winding, and the W-phase winding to be wound by shifting a certain number of slots from the V-phase winding, thereby improving the convenience of winding. Moreover, the number of slots shifted is set to K+N / P slots to ensure that each phase winding is evenly and symmetrically distributed, thereby reducing motor circulating current and harmonics.

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

[0054] The winding connection route of the first branch U1 is as follows: (Refer to...) Figure 4 The arrow in the diagram indicates the direction; the first winding segment starts from the a-th layer and the K-th slot of the crown end 21 (e.g., Figure 4 and Figure 5 After the second slot of layer a shown in the figure enters the stator core 1, it spans to the K+m slot of layer b at the welding end 22 (e.g., Figure 4 and Figure 5 As shown in the b-th layer, slot 7), then at crown end 21, it spans to the K+m+n-th slot of the a-th layer (e.g. Figure 4 and Figure 5 As shown in the diagram, the 14th slot of layer a), at the welding end 22, spans to the K+2m+n slot of layer b, at the crown end 21, spans to the K+2m+2n slot of layer a, and so on, until the welding end 22 spans to the K+6m+5n slot of layer b (e.g. Figure 4 and Figure 5 In the b-th layer, the 67th slot), then at the crown end 21, it crosses over to the K-th slot of the c-th layer, at the welding end 22, it crosses over to the K+m-th slot of the d-th layer, at the crown end 21, it crosses over to the K+m+n-th slot of the c-th layer, at the welding end 22, it crosses over to the K+2m+2n-th slot of the d-th layer, and so on, until at the welding end 22, it crosses over to the K+6m+5n-th slot of the d-th layer, then at the crown end 21, it crosses over to the K-th slot of the e-th layer, at the welding end 22, it crosses over to the K+m-th slot of the f-th layer, and so on. Crown end 21 spans to slot K+m+n of layer e, weld end 22 spans to slot K+2m+n of layer f, crown end 21 spans to slot K+2m+2n of layer e, and so on, until weld end 22 spans to slot K+6m+5n of layer f; after the connecting section is connected to the tail end of the first winding section, it enters the stator core 1 in slot K+6m+5n of layer f, and spans to slot K of layer f to connect with the beginning end of the second winding section. The second winding section starts from slot K+Nm of layer e at weld end 22 (e.g., Figure 4 and Figure 5 The 69th slot of the e-th layer enters the stator core 1, and at the crown end 21, it spans to the K+Nmn slot of the f-th layer (i.e., Figure 4 and Figure 5 In the f-th layer, the 62nd slot), and at the welding end 22, it spans to the K+N-2m-n slot of the e-th layer, then at the crown end 21, it spans to the K+N-2m-2n slot of the f-th layer, and so on, until at the welding end 22, it spans to the K+N-6m-5n slot of the e-th layer (e.g. Figure 4 and Figure 5In the 9th groove of layer e), then at crown end 21, it spans to the Kth groove of layer d, at welding end 22, it spans to the K+Nm groove of layer c, at crown end 21, it spans to the K+Nmn groove of layer d, and at welding end 22, it spans to the K+N-2m-n groove of layer c, then at crown end 21, it spans to the K+N-2m-2n groove of layer d, and so on, until at welding end 22, it spans to the K+N-6m-5n groove of layer c, and then at crown end 21... The process extends to the K-th groove of layer b, then to the K+Nm-th groove of layer a at welding end 22, then to the K+Nmn-th groove of layer b at crown end 21, and then to the K+N-2m-n-th groove of layer a at welding end 22. It then extends to the K+N-2m-2n-th groove of layer b at crown end 21, and so on, until it reaches the K+N-6m-5n-th groove of layer a at welding end 22, and then exits from the K+N-6m-5n-th groove of layer a at crown end 21 (i.e.,...). Figure 4 and Figure 5 (the 9th slot in layer a);

[0055] The winding connection route of the second branch U2 is as follows: the first winding segment starts from the a-th layer and the J-th slot of the crown end 21 (i.e. Figure 4 and Figure 5 After the third slot of layer a shown in the diagram enters the stator core 1, it crosses over to the J+m slot of layer b at the welding end 22 (i.e., Figure 4 and Figure 5 As shown in the b-th layer, the 8th slot), then at the crown end 21, it spans to the J+m+n slot of the a-th layer (i.e. Figure 4 and Figure 5 As shown in the diagram, the 15th slot of layer a), at the welding end 22, spans to the J+2m+n slot of layer b, at the crown end 21, spans to the J+2m+2n slot of layer a, and so on, until the welding end 22 spans to the J+6m+5n slot of layer b (i.e. Figure 4 and Figure 5 As shown in the diagram, the 68th slot of layer b), then crosses over to the Jth slot of layer c at crown end 21, crosses over to the J+m slot of layer d at welding end 22, crosses over to the J+m+n slot of layer c at crown end 21, crosses over to the J+2m+n slot of layer d at welding end 22, crosses over to the J+2m+2n slot of layer c at crown end 21, and so on, until crossing over to the J+6m+5n slot of layer d at welding end 22, then crosses over to the Jth slot of layer e at crown end 21, crosses over to the J+m slot of layer f at welding end 22, crosses over to the J+m+n slot of layer e at crown end 21, crosses over to the J+2m+n slot of layer f at welding end 22, crosses over to the J+2m+2n slot of layer e at crown end 21, and so on, until crossing over to the J+6m+5n slot of layer f at welding end 22 (i.e. Figure 4 and Figure 5As shown in the figure, up to slot 68 of layer f; after the connecting segment is connected to the tail end of the first winding segment, it enters the stator core 1 in slot J+6m+5n of layer f, and crosses over to slot K-1 of layer f (i.e. Figure 4 and Figure 5 The first slot of layer f shown in the diagram is connected to the first end of the second winding segment. The second winding segment enters the stator core 1 from the J+Nm slot of layer e at the welding end 22, crosses over to the J+Nmn slot of layer f at the crown end 21, crosses over to the J+N-2m-n slot of layer e at the welding end 22, then crosses over to the J+N-2m-2n slot of layer f at the crown end 21, and so on, until it crosses over to the J+N-6m-5n slot of layer e at the welding end 22, then crosses over to the K-1 slot of layer d at the crown end 21, crosses over to the J+Nm slot of layer c at the welding end 22, crosses over to the J+Nmn slot of layer d at the crown end 21, and crosses over to the J+Nmn slot of layer c at the welding end 22. -2m-n groove, then across to the J+N-2m-2n groove of the d layer at crown end 21, and so on, until across to the J+N-6m-5n groove of the c layer at welding end 22, then across to the K-1 groove of the b layer at crown end 21, across to the J+Nm groove of the a layer at welding end 22, across to the J+Nmn groove of the b layer at crown end 21, and across to the J+N-2m-n groove of the a layer at welding end 22, then across to the J+N-2m-2n groove of the b layer at crown end 21, and so on, until across to the J+N-6m-5n groove of the a layer at welding end 22, and from the J+N-6m-5n groove of the a layer at crown end 21 (i.e. Figure 4 and Figure 5 The 8th slot of layer a shown in the figure is led out, where J = K+1.

[0056] This allows for the arrangement of two parallel branches in each phase winding.

[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, and the number of stator slot layers is M = 6. The 1st to 6th layers of stator slots 11 from the inside out are denoted as layers a to f. Define xy 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 routes in the second branch U2 of the U-phase winding are 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] Where 2a represents the a-th layer of the second stator slot, that is, the first branch U1 of the U-phase winding starts winding from the a-th layer of the second stator slot. Similarly, the second branch U2 of the U-phase winding starts winding from the a-th layer of the third stator slot.

[0061] This achieves a U-phase winding arrangement with 72 slots, 12 poles, 2 branches, and 6 layers.

[0062] Furthermore, based on the winding slot offset relationship of the U-phase winding, V-phase winding, and W-phase winding described in the above embodiments, the connection route of the V-phase winding and W-phase winding can also be derived, such as... Figure 6 The diagram shows the winding distribution of the three-phase windings. In this diagram, the first branch V1 of the V-phase winding starts winding from the a-th layer of the 10th stator slot, the second branch V2 of the V-phase winding starts winding from the a-th layer of the 11th stator slot, the first branch W1 of the W-phase winding starts winding from the a-th layer of the 18th stator slot, and the second branch W2 of the W-phase winding starts winding from the a-th layer of the 19th stator slot.

[0063] Optionally, combined Figure 2 , Figure 7 , Figure 8 and Figure 9 As shown, both the first winding segment and the second winding segment include a first coil 23 and a plurality of second coils 24 connected in series. The first coil 23 is a single coil and is located in the first layer of the stator slot 11. The second coils 24 are U-shaped coils with overlapping windings. And / or, the connecting segment includes a third coil 25, which is a U-shaped coil with overlapping windings.

[0064] In this optional embodiment, both the first winding segment and the second winding segment are composed of a single coil and multiple lapped U-shaped coils connected in series. Furthermore, the first winding segment and the second winding segment are connected in series via a lapped U-shaped coil, and the beginning and end of the first winding segment and the end of the second winding segment are both single coils. This configuration facilitates winding using pre-formed single coils and lapped U-shaped coils, improving winding efficiency.

[0065] Furthermore, combined 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 through-slot portion 2311 for passing through 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 through-slot portion 2311. The first bent portion 232 is bent along the circumference of the stator core 1 away from the first through-slot portion 2311 to form a welding end 22. In this way, by providing a first bent portion 232 at one end of the first coil body 231 of the first coil 23, it is convenient to weld it to the second coil 24 to achieve series connection.

[0066] Furthermore, combined Figure 8 As shown, the second coil 24 includes a second coil body 241 and a second bending portion 242. The second coil body 241 includes two parallel second through-slot portions 2411 and a first connecting portion 2412 connecting one end of the two second through-slot portions 2411. The two second through-slot portions 2411 are respectively inserted into two stator slots 11 located in two adjacent slot layers with a span of n. The other ends of the two second through-slot portions 2411 are respectively connected to the second bending portion 242. The two second bending portions 242 are bent away from the second through-slot portions 2411 along the circumference of the stator core 1 to form a welding end 22, and the bending directions of the two second bending portions 242 are opposite. In this way, by providing second bending portions 242 at both ends of the second coil body 241 of the second coil 24, it is convenient to weld the second bending portions 242 of two adjacent second coils 24 to achieve series connection. Moreover, bending the two second bending portions 242 in opposite directions facilitates the winding along the circumference and the extension to the next slot layer.

[0067] Furthermore, combined Figure 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 parallel third through slot portions 2511 and a second connecting portion 2512 connecting one end of the two third through slot portions 2511. The two third through slot portions 2511 are respectively inserted into two stator slots 11 located in the Mth layer with a span of q. The other ends of the two third through slot portions 2511 are respectively connected to the third bending portion 252. The two third bending portions 252 are bent away from the third through slot portions 2511 along the circumference of the stator core 1 to form a welding end 22, and the bending directions of the two third bending portions 252 are the same. In this way, by providing third bends 252 at both ends of the third coil body 251 of the third coil 25, the two third bends 252 of the third coil 25 can be welded to the second coil 24 of the first winding section and the second coil 24 of the second winding section respectively to achieve series connection. Moreover, by bending the two third bends 252 in the same direction, the second winding section and the first winding section are arranged adjacent to each other, ensuring that each parallel branch is distributed in a ring symmetrical structure in the stator slot 11.

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

[0069] The advantages of the flat wire motor in this embodiment compared to the prior art are the same as those of the flat wire winding stator described above, and will not be repeated here.

[0070] An embodiment of the present invention provides a vehicle comprising a flat wire winding stator as described above, or comprising a flat wire motor as described above.

[0071] The advantages of the vehicle in this embodiment over the prior art are the same as those of the flat wire winding stator described above, and will not be repeated here.

[0072] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A flat wire winding stator, characterized in that, The stator 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 layers of slots for winding and wiring 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, where M is an even number greater than or equal to 4. The stator winding (2) extends from both ends of the stator slot (11) along the axial direction of the stator core (1) to form a crown end (21) and a weld 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 weld end (22) is m and the span at the crown end (21) is n, where m = N / P-1 and n = N / P+1. The stator winding (2) includes multi-phase windings. Each phase winding includes a first branch and a second branch connected in parallel. Both the first branch and the second branch include a first winding segment, a connecting segment, and a second winding segment. The first winding segment is introduced from the first layer of the stator slot at the crown end (21) and is wound alternately in two adjacent slot layers in a first direction along the circumference of the stator core (1) for one turn, and then crosses over to the next two adjacent slot layers for one turn, until the first winding segment is wound M / After 2 turns, the winding is laid to the Mth layer. The connecting segment connects the tail end of the first winding segment to the head end of the second winding segment in the Mth layer with a span q. The second winding segment is wound alternately in two adjacent slot layers in the second direction along the circumference of the stator core (1) and then laid across to the next two adjacent slot layers and wound alternately for one turn until the second winding segment is wound M / 2 turns and then laid to the 1st layer and led out from the crown end (21). The first direction and the second direction are opposite. The stator winding (2) 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 where the first end of the first winding segment of the first branch in the U-phase winding is located.

2. The flat wire winding stator according to claim 1, characterized in that, The span of the connecting segment in the first branch is q=n, and the span of the connecting segment in the second branch is q=m.

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

4. The flat wire winding stator according to claim 1, characterized in that, The first layer of the stator slot (11) is the innermost slot layer of the stator slot (11), and the Mth layer of the stator slot (11) is the outermost slot layer of the stator slot (11).

5. The flat wire winding stator according to claim 2, 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 stator slots (11) is M=6, and the 1st to 6th layers of stator slots (11) from the inside to the outside are denoted as layers a to f. Define xy as the yth layer of the xth stator slot, x∈[1, 72], y∈[a, f]; The winding connection routes in the first branch 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; The winding connection routes in the second branch of the U-phase winding are 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.

6. The flat wire winding stator according to claim 1, characterized in that, Both the first winding segment and the second winding segment include a first coil (23) and a plurality of second coils (24) connected in series. The first coil (23) is a single coil and is located in the first layer of the stator slot (11). The second coils (24) are stacked U-shaped coils. And / or, the connecting segment includes a third coil (25), which is a stacked U-shaped coil.

7. A flat wire motor, characterized in that, Includes the flat wire winding stator as described in any one of claims 1-6.

8. A vehicle, characterized in that, It includes a flat wire winding stator as described in any one of claims 1-6, or a flat wire motor as described in claim 7.

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