Flat wire motor stator, flat wire motor and vehicle

Abstract

The present invention provides a flat wire motor stator, a flat wire motor, and a vehicle, relating to the field of vehicle technology. The flat wire motor stator includes a stator core and a stator winding. The inner wall of the stator core is provided with a plurality of stator slots along the circumferential direction. Each stator slot is provided with M slot layers along the radial direction of the stator core for wiring the stator winding. The flat wire motor stator is used for a flat wire motor having N stator slots and P pole pairs. The stator winding includes a multi-phase winding, each phase winding including a plurality of parallel branches, each branch being formed by a plurality of different-layer hairpin coils connected in series. The different-layer hairpin coils are arranged between two adjacent slot layers with a span of N / P-1, and the span between two adjacent different-layer hairpin coils in the current direction is N / P+1. In this way, the stator winding has no coils on the same layer at the crown end and the span is short, which can reduce the radial and axial dimensions of the crown end, thereby reducing the copper usage and resistance of the winding, saving production costs, and improving motor efficiency.

Description

Technical Field

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

[0002] Stator windings can be divided into round wire and flat wire types. The difference between flat wire and round wire motors lies in the forming method of the copper wire. Flat wire is beneficial for improving the slot fill factor of the motor. Generally, the slot fill factor of a round wire motor is around 50%, while that of a flat wire motor can reach over 70%. Increased slot fill factor means that more copper can be filled with the same amount of space, reducing the motor's resistance and copper losses at the same current. 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] However, existing flat wire stator windings typically employ full-pitch wave windings, which tend to occupy a large amount of radial and axial space at the winding ends, increasing winding cost and resistance, thus limiting the improvement of motor efficiency. Moreover, the design of flat wire stator windings is not flexible enough, has poor adaptability, and is difficult to adapt to parallel branches with different numbers of branches, thus having certain limitations. Summary of the Invention

[0004] The problem this invention addresses is how to reduce the end dimensions of flat wire windings and improve motor efficiency.

[0005] To address the above problems, the present invention provides a flat wire motor stator, a flat wire motor, and a vehicle.

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

[0007] The stator winding includes a multi-phase winding, each phase winding includes multiple parallel branches, each branch is composed of multiple heterogeneous hairpin coils connected in series, the heterogeneous hairpin coils are strung between two adjacent slot layers with a span m, and the span between two adjacent heterogeneous hairpin coils in the current direction is n, where m = N / P-1, n = N / P+1.

[0008] Optionally, the branch includes two series-connected first winding units and second winding units. Both the first winding unit and the second winding unit include L series-connected hairpin coils. The first winding unit is introduced from the Mth layer of the stator slot and is wound alternately in the Mth and M-1th layers along the circumference of the stator core in a first direction, and then crosses over to the next two adjacent slot layers to be wound alternately once, until the first winding unit is wound M / 2 times and then wound to the 1st layer of the stator slot. The second winding unit is connected to the tail end of the first winding unit in the 1st layer and is wound alternately in the 1st and 2nd layers along the circumference of the stator core in a second direction, and then crosses over to the next two adjacent slot layers to be wound alternately once, until the second winding unit is wound M / 2 times and then wound to the Mth layer for exit. Wherein, L = P*M / 4, and the first direction and the second direction are opposite.

[0009] Optionally, two adjacent heterogeneous hairpin coils in the current direction are interconnected to form a welded end, and the stator winding leads are located at the welded end.

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

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

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

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

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

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

[0017] The second hairpin coil includes a second coil body and a second bending portion. The second coil body includes two parallel second through slots and a second connecting portion connecting one end of the two second through slots. The two second through slots are respectively inserted into two adjacent layers of the two stator slots with a span of n. The other ends of the two second through slots are respectively connected to the second bending portion. The two second bending portions are bent along the circumference of the stator core, and the bending directions of the two second bending portions are the same.

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

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

[0020] The beneficial effects of the flat wire motor 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 different-layer hairpin coils in the stator slots to form a stator winding, and by bridging the different-layer hairpin coils in each branch between two adjacent slot layers, setting the span m of the different-layer hairpin coils to be equal to N / P-1, and setting the span n between two adjacent different-layer hairpin coils in the current direction to be equal to N / P+1, the span of the stator winding at the crown end is N / P-1, and the span at the welding end is N / P+1, so as to ensure that the coils of the flat wire winding are evenly distributed. Furthermore, this design eliminates the presence of coils in the same layer at the crown end of the stator winding and establishes a short span. This not only allows for greater flexibility in the winding method of the flat wire stator winding, making it suitable for different branch numbers, but also reduces the radial and axial dimensions of the crown end of the stator winding. This reduces the amount of copper used in the winding, saving on production costs. Simultaneously, it lowers the winding's own resistance, facilitating improved motor efficiency. Additionally, the non-layer hairpin coil is typically a pre-formed, stacked U-shaped coil. Utilizing pre-formed, stacked U-shaped coils for winding improves winding efficiency and convenience. Attached Figure Description

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

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

[0023] Figure 3 This is a schematic diagram of the stator slot layer distribution in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the same-layer hairpin coil in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the heterogeneous hairpin coil in an embodiment of the present invention;

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

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

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

[0029] Figure 9 This is a schematic diagram of the winding distribution of the U-phase winding of a 48-slot, 8-pole, 6-layer, 2-branch flat wire motor in an embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram of the winding distribution of the three-phase windings of the stator winding of a 48-slot, 8-pole, 6-layer, 2-branch flat wire motor in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Stator core; 11. Stator slot; 112. Slot opening; 2. Stator winding; 21. Crown end; 22. Welding end; 23. Different layer hairpin coil; 231. First hairpin coil; 2311. First coil body; 2311a. First slot-penetrating part; 2311b. First connecting part; 2312. First bending part; 232. Second hairpin coil; 2321. Second coil body; 2321a. Second slot-penetrating part; 2321b. Second connecting part; 2322. Second bending part. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to 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 construed as being limited to the embodiments described herein. Instead, 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 for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

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

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

[0036] In related technologies, flat wire stator windings typically employ full-pitch wave windings, which tend to occupy a large amount of radial and axial space at the winding ends, increasing winding cost and resistance, thus limiting the improvement of motor efficiency. Moreover, the design of flat wire stator windings is not flexible enough, has poor adaptability, and is difficult to adapt to parallel branches with different numbers of branches, thus having certain limitations.

[0037] To address the problems existing in the aforementioned related technologies, the present invention provides a flat wire motor stator, a flat wire motor, and a vehicle.

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

[0039] 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 the stator windings 2 are provided radially within each stator slot 11, meaning the stator windings 2 are arranged in layers within the stator slots 11. Here, 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 slot layers of the stator slots 11 can be designated from the outside to the inside as layer 1 to layer M, or vice versa. No specific limitation is made here; the appropriate designation can be made based on the specific application. The stator windings 2 can include two-phase windings or three-phase windings. Each phase winding can include two parallel branches or three parallel branches; no specific limitation is made here. Each branch is wound with multiple non-linear hairpin coils 23. Each non-linear hairpin coil 23 is straddling two adjacent slot layers and occupies a different slot layer. In the current direction, all adjacent non-linear hairpin coils 23 are connected in series by welding to form the welding end 22 of the stator winding 2. The end that does not need to be welded is called the crown end 21 of the stator winding 2. In addition, the crown end 21 and the welding end 22 of the stator winding 2 extend out of the stator slot 11 along the axial direction of the stator core 1 to facilitate wiring and welding. The span of the heterogeneous hairpin coil 23 is m = N / P-1. The span between two adjacent heterogeneous hairpin coils 23 in the current direction is n = N / P+1. That is, the span of the stator winding 2 at the crown end 21 is m, and the span at the welding end 22 is n. There are no coils in the same layer at the crown end 21. In other words, the two effective sides of the hairpin coil (i.e., the part of the coil passing through the stator slot 11) span different slot layers. The span of the hairpin coil refers to the number of slots occupied by the two adjacent effective sides of a coil (i.e., the part of the coil passing through the stator slot 11). The span between two adjacent hairpin coils refers to the number of slots occupied by the two adjacent effective sides of two adjacent coils (i.e., the part of the coil passing through the stator slot 11). When the span = number of stator slots / number of pole pairs, the span is a whole pitch. When the span is less than the whole pitch, the span is a short pitch. When the span is greater than the whole pitch, the span is a long pitch.

[0040] In this embodiment, the stator of the flat wire motor can be formed by setting N stator slots 11 on the circumferential inner wall of the stator core 1, and winding M layers of different-layer hairpin coils 23 in the stator slots 11 to form a stator winding 2. At the same time, by bridging the different-layer hairpin coils 23 in each branch between two adjacent slot layers, setting the span m of the different-layer hairpin coils 23 to be equal to N / P-1, and setting the span n between two adjacent different-layer hairpin coils 23 in the current direction to be equal to N / P+1, the span of the stator winding 2 at the crown end 21 is N / P-1 and the span at the welding end 22 is N / P+1, so as to ensure that the coils of the flat wire winding are evenly distributed. Furthermore, this design ensures that there are no coils in the same layer at the crown end 21 of the stator winding 2, and that the span is short. This not only makes the winding method of the flat wire stator winding more flexible, applicable to winding schemes with different numbers of branches, but also reduces the radial and axial dimensions of the crown end 21 of the stator winding 2, thereby reducing the amount of copper used in the winding and saving on production costs. Simultaneously, it also reduces the winding's own resistance, facilitating improved motor efficiency. Additionally, the non-layer hairpin coil 23 is typically a pre-formed, stacked U-shaped coil, and using a pre-formed, stacked U-shaped coil for winding improves winding efficiency and convenience.

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

[0042] 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.

[0043] In this optional embodiment, each branch consists of two series-connected first winding units and second winding units. The first winding unit is formed by winding L different-layer hairpin coils 23 in a first direction, and the second winding unit is formed by winding L different-layer hairpin coils 23 in a second direction. For ease of description, the winding method of the branch is described here using an example where the number of slot layers M=6 in the stator slot 11. After the first winding unit is introduced into the stator core 1 from the 6th layer of the stator slot 11, it starts winding along the circumference of the stator core 1 in the first direction. First, P / 2 different-layer hairpin coils 23 are alternately wound once in the 6th and 5th layers and then extended to the 4th layer. Then, P / 2 different-layer hairpin coils 23 are alternately wound once in the 4th and 3rd layers and then extended to the 2nd layer. Finally, P / 2 different-layer hairpin coils 23 are wound in the 2nd and 1st layers. After alternating one turn in the first and second layers, the second winding unit is connected to the tail end of the first winding unit in the first layer, and then wound along the circumference of the stator core 1 in the second direction. First, P / 2 different-layer hairpin coils 23 are alternately wound one turn in the first and second layers and then transferred to the third layer. Then, P / 2 different-layer hairpin coils 23 are alternately wound one turn in the third and fourth layers and then transferred to the fifth layer. Finally, P / 2 different-layer hairpin coils 23 are alternately wound one turn in the fifth and sixth layers and then wound to the sixth layer, and then led out from the sixth layer. When the number of stator slots 11 M=6, this winding method makes the windings in any three adjacent stator slots 11 occupied by the two branches distributed in a 3, 6, 3 pattern, such as... Figure 9 As shown, in the case of three adjacent stator slots 11, the left stator slot 11 has windings distributed in odd-numbered layers, the middle stator slot 11 has windings distributed in all 6 slot layers, and the right stator slot 11 has windings distributed in even-numbered layers. When the number of slot layers M of the stator slot 11 is 8, this winding method makes the windings in any three adjacent stator slots 11 occupied by the two branches distributed in a 4, 8, 4 pattern. That is, in the case of three adjacent stator slots 11, the left stator slot 11 has windings distributed in odd-numbered layers, the middle stator slot 11 has windings distributed in all 8 slot layers, and the right stator slot 11 has windings distributed in even-numbered layers.

[0044] This ensures that each parallel branch is distributed in a ring-shaped symmetrical structure within the stator slot 11, thereby achieving a uniform and symmetrical distribution of each phase winding. This results in balanced potential in each branch, no circulating current, and harmonic cancellation, significantly improving motor performance. Furthermore, in any three adjacent stator slots 11 occupied by two branches of a phase winding, the left stator slot 11 has windings distributed in odd-numbered layers, the middle stator slot 11 has windings distributed in all M slot layers, and the right stator slot 11 has windings distributed in even-numbered layers. This ensures that when winding other phase windings by shifting the number of slots, the distribution of each phase winding within multiple stator slots 11 remains completely consistent, further reducing motor circulating current and improving motor performance. Additionally, the leads of each phase winding of stator winding 2 are located in the first edge layer, facilitating the selection of different wiring methods such as delta or star connections as needed, increasing the flexibility of phase winding wiring.

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

[0046] In this optional embodiment, the stator winding 2 exits from the Mth layer of the stator slot 11 at the welding end 22, so that the crown end 21 of the stator winding 2 has no lead wire. This simplifies the structure of the tooling equipment that mates with the crown end 21, thereby facilitating the universal design of the tooling equipment that mates with the crown end 21.

[0047] Furthermore, combined Figure 3 As shown, the first to M layers of stator slot 11 are distributed radially from the slot opening 112 to the bottom of the stator slot 11. This allows the windings of each branch to start winding from the bottom of the stator slot 11, so that the bottom and sidewalls of the stator slot 11 can be used to limit the windings and prevent them from coming off the slot opening, thereby improving the convenience of winding and ensuring that the windings are evenly distributed in the stator slot 11.

[0048] 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.

[0049] 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 motor stator to be applicable to 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 crown end 21 of the stator winding 2 in N-slot N / 6-pole motors is always 5, facilitating the universal design of tooling equipment that mates with the crown end 21.

[0050] Optionally, combined Figure 10 As shown, the stator winding 2 includes a U-phase winding, a V-phase winding, and a W-phase winding; each of the U-phase winding, V-phase winding, and W-phase winding includes a first branch and a second branch connected in parallel. The U-phase winding is offset by 4+i*N / P slots clockwise to obtain the V-phase winding, and the V-phase winding is offset by 4+i*N / P slots clockwise to obtain the W-phase winding. Alternatively, the U-phase winding is offset by 4+i*N / P slots counterclockwise to obtain the V-phase winding, and the V-phase winding is offset by 4+i*N / P slots counterclockwise to obtain the W-phase winding, where i ∈ [0, P-1].

[0051] It should be noted that, Figure 10 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).

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

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

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

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

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

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

[0058] 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 10The 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 f-th layer of the 22nd stator slot, the second branch V2 of the V-phase winding starts winding from the f-th layer of the 23rd stator slot, the first branch W1 of the W-phase winding starts winding from the f-th layer of the 18th stator slot, and the second branch W2 of the W-phase winding starts winding from the f-th layer of the 19th stator slot.

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

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

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

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

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

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

[0065] An embodiment of the present invention provides a vehicle comprising a flat wire motor stator as described above, or comprising a flat wire motor as described above.

[0066] The advantages of the vehicle in this embodiment over the prior art are the same as those of the flat wire motor stator described above, and will not be repeated here.

[0067] 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 motor 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 along the radial direction of the stator core (1) for wiring of the stator winding (2). The flat wire motor stator is used for a flat wire 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) includes a multi-phase winding, each phase winding includes multiple parallel branches, each branch is composed of multiple heterogeneous hairpin coils (23) connected in series, the heterogeneous hairpin coils (23) are strung between two adjacent slot layers with a span m, and the span between two adjacent heterogeneous hairpin coils (23) in the current direction is n, where m=N / P-1, n=N / P+1; The branch includes two series-connected first winding units and second winding units. Both the first winding unit and the second winding unit include L series-connected hairpin coils (23). The first winding unit is introduced from the Mth layer of the stator slot (11) and is wound alternately in the Mth and M-1th layers along the circumference of the stator core (1) in the first direction, and then crossed to the next two adjacent slot layers to be wound alternately for one turn, until the first winding unit is wound M / 2 turns and then wound to the 1st layer of the stator slot (11). The second winding unit is connected to the tail end of the first winding unit in the 1st layer and is wound alternately in the 1st and 2nd layers along the circumference of the stator core (1) in the second direction, and then crossed to the next two adjacent slot layers to be wound alternately for one turn, until the second winding unit is wound M / 2 turns and then wound to the Mth layer for lead-out; where L=P*M / 4, and 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, the V-phase winding, and the W-phase winding each include a first branch and a second branch connected in parallel. The U-phase winding is offset by 4+i*N / P slots clockwise to obtain the V-phase winding, and the V-phase winding is offset by 4+i*N / P slots clockwise to obtain the W-phase winding. Alternatively, the U-phase winding is offset by 4+i*N / P slots counterclockwise to obtain the V-phase winding, and the V-phase winding is offset by 4+i*N / P slots counterclockwise to obtain the W-phase winding, where i ∈ [0, P-1].

2. The flat wire motor stator according to claim 1, characterized in that, Two adjacent hairpin coils (23) in the current direction are connected to each other to form a welded end (22), and the lead of the stator winding (2) is located at the welded end (22).

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

5. The flat wire motor stator according to claim 1, characterized in that, The L heterogeneous hairpin coils (23) of the first winding unit are all first hairpin coils (231). The first hairpin coil (231) includes a first coil body (2311) and a first bending part (2312). The first coil body (2311) includes two parallel first slots (2311a) and a first connecting part (2311b) connecting one end of the two first slots (2311a). The two first slots (2311a) are respectively inserted in two adjacent layers of two stator slots (11) with a span of n. The other end of the two first slots (2311a) is respectively connected to the first bending part (2312). The two first bending parts (2312) are respectively bent along the circumference of the stator core (1), and the bending directions of the two first bending parts (2312) are opposite.

6. The flat wire motor stator according to claim 5, characterized in that, In the L heterogeneous hairpin coils (23) of the second winding unit, one heterogeneous hairpin coil (23) is the second hairpin coil (232), L-1 heterogeneous hairpin coils (23) are the first hairpin coils (231), and the second hairpin coil (232) is connected to the tail end of the first winding unit; The second hairpin coil (232) includes a second coil body (2321) and a second bending portion (2322). The second coil body (2321) includes two parallel second through slot portions (2321a) and a second connecting portion (2321b) connecting one end of the two second through slot portions (2321a). The two second through slot portions (2321a) are respectively inserted in two adjacent layers of the two stator slots (11) with a span of n. The other end of the two second through slot portions (2321a) is respectively connected to the second bending portion (2322). The two second bending portions (2322) are bent along the circumference of the stator core (1), and the bending direction of the two second bending portions (2322) is the same.

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

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

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