Flat wire motor stator, flat wire motor and vehicle

Abstract

This 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 stator windings and a stator core with stator slots. The stator windings include multi-phase windings, each branch of which is composed of multiple hairpin coils connected in series. The hairpin coils include same-layer hairpin coils and different-layer hairpin coils. The same-layer hairpin coils are positioned across the first and Mth layers of the stator slots, while the different-layer hairpin coils are positioned between adjacent slot layers in the middle layer of the stator slots. M / 2-1 different-layer hairpin coils are connected in series between two adjacent same-layer hairpin coils in the current direction. The span between the same-layer hairpin coils in the Mth layer is N / P-1, and the span between the different-layer hairpin coils and the same-layer hairpin coils in the first layer is N / P+1. The span between two adjacent hairpin coils in the current direction is N / P-1. This reduces the amount of copper and resistance of the flat wire windings, saves production costs, and improves 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] Compared to round copper wire motors, flat wire motors can achieve a slot fill factor of over 60%, significantly higher than that of round copper wire motors. This increased slot fill factor means that, with the number of slots remaining constant, the DC resistance of the windings can be reduced, copper losses in the motor can be decreased, and motor efficiency can be improved. Therefore, flat wire motors have become an important measure for promoting lightweighting in automobiles, increasing the driving range of electric vehicles, and reducing powertrain costs, and are widely used in the drive systems of new energy vehicles.

[0003] 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. 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 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 stator slot is provided with M layers of slot layers along the radial direction of the stator core for wiring of the stator winding, the flat wire motor stator being 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 multi-phase windings, each phase winding including multiple parallel branches, each branch consisting of multiple hairpin coils connected in series. The hairpin coils include same-layer hairpin coils and different-layer hairpin coils. The same-layer hairpin coils span the first and Mth layers of the stator slots, and the different-layer hairpin coils span between adjacent slot layers in the middle layer of the stator slots. M / 2-1 different-layer hairpin coils are connected in series between two adjacent same-layer hairpin coils in the current direction, and the span of the different-layer hairpin coils is n. The span of the same-layer hairpin coils located in the Mth layer is m, the span of the same-layer hairpin coils located in the first layer is n, and the span between two adjacent hairpin coils in the current direction is m; where L = P, m = N / P-1, n = N / P+1.

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

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

[0010] 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].

[0011] 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.

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

[0015] Optionally, the same-layer hairpin coil includes a first coil body and a first bending portion. The first coil body includes two 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 of the same-layer hairpin coil with a span of m are respectively inserted into two adjacent layers of the two stator slots with a span of m. The two first through-slot portions of the same-layer hairpin coil with a span of n are respectively inserted into two adjacent layers of the 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 the same.

[0016] Optionally, the heterogeneous 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 respectively bent along the circumference of the stator core, and the bending directions of the two second bending portions are opposite.

[0017] Secondly, the present invention provides a flat wire motor, including the flat wire motor stator as described above.

[0018] 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.

[0019] The beneficial effects of the flat wire motor stator, flat wire motor, and vehicle of the present invention are as follows: N stator slots can be provided on the circumferential inner wall of the stator core, and M layers of hairpin coils can be wound in the stator slots to form a stator winding; by bridging the same-layer hairpin coils among the multiple hairpin coils of each branch at the 1st and Mth layers of the stator slots, bridging the different-layer hairpin coils among the multiple hairpin coils between adjacent slot layers at the middle layer of the stator slots, and connecting M / 2-1 different-layer hairpin coils in series between two adjacent same-layer hairpin coils in the current direction, i.e., located in the 1st or Mth layer... The beginning and end of the same-layer hairpin coil at layer M are connected to two different-layer hairpin coils respectively, so that there are no same-layer coils at the welding end of the stator winding. At the same time, by setting the span m of the same-layer hairpin coil at layer M to be equal to N / P-1, and setting the span n of the different-layer hairpin coil and the same-layer hairpin coil at layer 1 to be equal to N / P+1, the stator winding is arranged with both spans of N / P-1 and N / P+1 at the crown end, and with span of N / P-1 at the welding end, so as to ensure that the coils of the flat wire winding are evenly distributed. Furthermore, by setting the span m between two adjacent hairpin coils in the current direction to be equal to N / P-1, the span at the welding end of the stator winding is short. In this way, the stator winding has neither coils in the same layer nor a short-pitch arrangement at the welding end. This not only makes the winding method of the flat wire stator winding more flexible and applicable to winding schemes with different numbers of branches, but also reduces the radial and axial dimensions of the welding end of the stator winding, 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

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

[0021] Figure 2 This is a schematic diagram of the stator winding structure in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the stator slot layer distribution in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the same-layer hairpin coil in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the heterogeneous hairpin coil in an embodiment of the present invention;

[0025] 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.

[0026] 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;

[0027] 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.

[0028] 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.

[0029] 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.

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

[0031] 1. Stator winding; 11. Crown end; 12. Welding end; 13. Hairpin coil; 131. Same-layer hairpin coil; 1311. First coil body; 1311a. First slot; 1311b. First connection; 1312. First bend; 132. Different-layer hairpin coil; 1321. Second coil body; 1321a. Second slot; 1321b. Second connection; 1322. Second bend; 2. Stator core; 21. Stator slot; 211. Slot opening. 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, 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.

[0036] 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.

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

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

[0039] Specifically, N stator slots 21 are evenly distributed along the circumference of the stator core 2 on the inner wall of the stator core 2. Furthermore, M slot layers are provided along the radial direction of the stator core 2 within each stator slot 21 for the stator winding 1 to be routed. That is, the stator winding 1 is arranged in layers within the stator slots 21, where M is an even number greater than or equal to 4. For example, the number of slot layers M in the stator slots 21 can be 4, 6, or 8, etc. Alternatively, the slot layers of the stator slots 21 can be designated from the outside to the inside as layer 1 to layer M, 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 1 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 in-layer hairpin coils 131 and multiple out-of-layer hairpin coils 132. The in-layer hairpin coils 131 are positioned across the first and Mth layers of the stator slot 21, and each out-of-layer hairpin coil 132 is positioned between two adjacent slot layers in the middle layer of the stator slot 21, occupying a different slot layer. The middle layer of the stator slot 21 includes the second to the (M-1)th layers. Furthermore, in the current direction, all adjacent hairpin coils 13 are connected in series by welding to form the welding end 12 of the stator winding 1. The end that does not require welding 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 to facilitate wiring and welding. Meanwhile, in the direction of current, M / 2-1 different-layer hairpin coils 132 are connected in series between two adjacent same-layer hairpin coils 131. That is, the beginning and end of the same-layer hairpin coil 131 located in the first or Mth layer are respectively connected to two different-layer hairpin coils 132. This makes it possible that at the welding end, the pins of any two adjacent hairpin coils 13 (i.e. the bent part of the hairpin coil described later) are connected across layers. This arrangement makes the welding end 12 of the stator winding 1 without same-layer coils.

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

[0041] In this embodiment, the stator of the flat wire motor can be formed by setting N stator slots 21 on the circumferential inner wall of the stator core 2, and winding M layers of hairpin coils 13 in the stator slots 21 to form a stator winding 1; by bridging the same layer hairpin coils 131 of the multiple hairpin coils 13 of each branch across the first and Mth layers of the stator slots 21, bridging the different layer hairpin coils 132 of the multiple hairpin coils 13 across the middle layer of the stator slots 21 between two adjacent slot layers, and connecting M / 2-1 different layer hairpin coils 132 in series between two adjacent same layer hairpin coils 131 in the current direction, i.e., located in the first or Mth layer. The beginning and end of the same-layer hairpin coil 131 are connected to two different-layer hairpin coils 132 respectively, so that there are no same-layer coils at the welding end 12 of the stator winding 1. At the same time, by setting the span m of the same-layer hairpin coil 131 located in the Mth layer to be equal to N / P-1, and setting the span n of the different-layer hairpin coil 132 and the same-layer hairpin coil 131 located in the 1st layer to be equal to N / P+1, the stator winding 1 is arranged with both spans of N / P-1 and N / P+1 at the crown end 11, and with a span of N / P-1 at the welding end 12, so as to ensure that the coils of the flat wire winding are evenly distributed. Furthermore, by setting the span m between two adjacent hairpin coils 13 in the current direction to be equal to N / P-1, the span of the welding end 12 of the stator winding 1 is short-pitched. In this way, the stator winding 1 has neither coils in the same layer nor a short-pitch arrangement at the welding end 12. This not only makes the winding method of the flat wire stator winding more flexible and applicable to winding schemes with different numbers of branches, but also reduces the radial and axial dimensions of the welding end 12 of the stator winding 1, 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.

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

[0043] It should be noted that the Mth layer of stator slot 21 can be the bottom of stator slot 21, i.e., the outermost layer of stator slot 21. In this case, the 1st layer of stator slot 21 is the slot opening 211, i.e., the innermost layer of stator slot 21. Alternatively, the Mth layer of stator slot 21 can also be the slot opening 211, i.e., the innermost layer of stator slot 21. In this case, the 1st layer of stator slot 21 is the bottom of stator slot 21, i.e., the outermost layer of stator slot 21. In practical applications, the outermost layer at the bottom of stator slot 21 is usually taken as the Mth layer of stator slot 21, and the innermost layer at the slot opening 211 is taken as the 1st layer of stator slot 21. This allows the windings of each branch to start winding from the bottom of the stator slot 21, so that the bottom and sidewalls of the stator slot 21 can be used to limit the windings and prevent the windings from coming off the slot opening of the stator slot 21, thereby improving the convenience of winding and ensuring that the windings are evenly distributed in the stator slot 21.

[0044] In this optional embodiment, each branch is formed by P / 2 winding units connected in series. Specifically, the branch uses a same-layer hairpin coil 131 with a span of m as the starting point for winding in the Mth layer of stator slot 21. M / 2-1 different-layer hairpin coils 132 are used to wind from the (M-1)th layer of stator slot 21 to the 2nd layer. In the 1st layer, a same-layer hairpin coil 131 with a span of n is used for in-layer reversal, that is, in the 1st layer, it crosses n slots in the opposite direction. M / 2-1 different-layer hairpin coils 132 are used to wind back from the 2nd layer of stator slot to the (M-1)th layer to complete the winding of one winding unit. This process continues until P / 2 winding units are completed and then wound to the (M-1)th layer of stator slot 21 for exit. When the number of slot layers M of stator slot 21 is 6, this winding method ensures that the windings in any three adjacent stator slots 21 occupied by the two branches are distributed in a 3, 6, 3 pattern. Figure 9 As shown, in the case of three adjacent stator slots 21, the left stator slot 21 has windings distributed in odd-numbered layers, the middle stator slot 21 has windings distributed in all 6 slot layers, and the right stator slot 21 has windings distributed in even-numbered layers. When the number of slot layers M of the stator slot 21 is 8, this winding method makes the windings in any three adjacent stator slots 21 occupied by the two branches distributed in a 4, 8, 4 pattern. That is, in the case of three adjacent stator slots 21, the left stator slot 21 has windings distributed in odd-numbered layers, the middle stator slot 21 has windings distributed in all 8 slot layers, and the right stator slot 21 has windings distributed in even-numbered layers.

[0045] This ensures that each parallel branch is distributed in a ring-shaped symmetrical structure within the stator slot 21, 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 21 occupied by two branches of a phase winding, the left stator slot 21 has windings distributed in odd-numbered layers, the middle stator slot 21 has windings distributed in all M slot layers, and the right stator slot 21 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 21 is completely consistent, further reducing motor circulating current and improving motor performance. In addition, the leads of each phase winding of stator winding 1 are set in the Mth and M-1th layers of stator slot 21, so that the leads of each phase winding are distributed in two rows in the circumferential direction of stator core 2 instead of one row. This not only facilitates the connection of each phase winding using a star connection method, but also reduces the space occupied by the leads of each phase winding in the circumferential direction of stator core 2. In this way, when using busbars to connect each phase winding, the circumferential dimension of the busbars in stator core 2 can be reduced, making the structure of the flat wire motor stator more compact and convenient for arrangement.

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

[0047] In this optional embodiment, the stator winding 1 has wires coming out from the Mth and M-1th layers of the stator slot 21 at the welding end 12, so that the crown end 11 of the stator winding 1 has no lead wires. This simplifies the structure of the tooling equipment that mates with the crown end 11, thereby facilitating the universal design of the tooling equipment that mates with the crown end 11.

[0048] Optionally, the number N of stator slots 21 is a multiple of 24, the number of pole pairs P = N / 6, the span m = 5, and the span n = 7.

[0049] In this optional embodiment, the number N of stator slots 21 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 welding ends 12 of the stator windings 1 in N-slot N / 6-pole motors is always 5, facilitating the use of universal welding fixtures.

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

[0052] In one example, when the first branch U1 of the U-phase winding enters the stator core 2 from the Mth layer of the 2nd slot, and the second branch U2 enters the stator core 2 from the Mth layer of the 3rd slot, 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. At this time, as... Figure 10 As shown, the first branch V1 of the V-phase winding enters the stator core 2 from the Mth layer of slot 6, and the second branch V2 enters the stator core 2 from the Mth layer of slot 7. The first branch W1 of the W-phase winding enters the stator core 2 from the Mth layer of slot 10, and the second branch W2 enters the stator core 2 from the Mth layer of slot 11. Alternatively, the U-phase winding can be shifted 4 slots counterclockwise to obtain the V-phase winding, and the V-phase winding can be shifted 4 slots counterclockwise to obtain the W-phase winding. In this case, the first branch V1 of the V-phase winding enters the stator core 2 from the Mth layer of slot 46, and the second branch V2 enters the stator core 2 from the Mth layer of slot 47. The first branch W1 of the W-phase winding enters the stator core 2 from the Mth layer of slot 42, and the second branch W2 enters the stator core 2 from the Mth layer of slot 43.

[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 9As shown, the number of stator slots 21 is N=48, the number of pole pairs is P=8, and the number of layers of stator slots 21 is M=6. The 1st to 6th layers of stator slots 21 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: 2f→45f→2e→9d→14c→21b→26a→19a→14b→7c→2d→43e→38f→33f→38e→45d→2c→9b→14a→7a→2b→43c→38d→31e→26f→21f→26e→33d→38c→45b→2a→43a→38b→31c→26d→19e→14f→9f→14e→21d→26c→33b→38a→31a→26b→19c→14 d→7e; and the winding connection routes in the second branch are as follows: 3f→8f→13e→20d→25c→32b→37a→44a→39b→32c→27d→20e→15f→20f→25e→32d→37c→44b→1a→8a→3b→44c→39d→32e→27f→32f→37e→44d→1c→8b→13a→20a→15b→8c→3d→44e→39f→44f→1e→8d→13c→20b→25a→32a→27b→20c→15d→8e.

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

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

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

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

[0062] In this way, by providing second bending portions 1322 at both ends of the second coil body 1321 of the heterogeneous hairpin coil 132, the second bending portions 1322 of two adjacent heterogeneous hairpin coils 132 are welded together to achieve series connection. Moreover, the two second bending portions 1322 of the heterogeneous hairpin coil 132 are bent in opposite directions to facilitate circumferential winding and crossing to the next slot layer.

[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 winding (1) and a stator core (2). The inner wall of the stator core (2) is provided with a plurality of stator slots (21) along the circumferential direction. Each stator slot (21) is provided with M layers of slots along the radial direction of the stator core (2) for wiring of the stator winding (1). The flat wire motor stator is used for a flat wire motor with N stator slots (21) and P pole pairs, where M is an even number greater than or equal to 4. The stator winding (1) includes multi-phase windings, each phase winding including multiple parallel branches, each branch consisting of multiple hairpin coils (13) connected in series. Each hairpin coil (13) includes a same-layer hairpin coil (131) and a different-layer hairpin coil (132). The same-layer hairpin coil (131) spans the first and Mth layers of the stator slot (21), and the different-layer hairpin coil (132) spans between adjacent slot layers in the middle layer of the stator slot (21). M / 2-1 different-layer hairpin coils (132) are connected in series between two adjacent same-layer hairpin coils (131) in the current direction, and the span of the different-layer hairpin coils (132) is n, the span of the same-layer hairpin coil (131) located at the Mth layer is m, the span of the same-layer hairpin coil (131) located at the 1st layer is n, and the span between two adjacent hairpin coils (13) in the current direction is m; where m=N / P-1, n=N / P+1; The branch includes P / 2 series-connected winding units. The branch uses a same-layer hairpin coil (131) with a span of m as the starting point for winding in the Mth layer of the stator slot (21). M / 2-1 different-layer hairpin coils (132) are used to wind from the M-1th layer of the stator slot (21) to the 2nd layer. In the 1st layer, a same-layer hairpin coil (131) with a span of n is used for same-layer commutation. M / 2-1 different-layer hairpin coils (132) are used to wind back from the 2nd layer of the stator slot to the M-1th layer to complete the winding of one winding unit. Then, the second winding unit is wound in the same manner as described above until P / 2 winding units are completed and then wound to the M-1th layer of the stator slot (21) for lead-out. 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 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 (13) in the current direction are connected to each other to form a welded end (12), and the lead of the stator winding (1) is located at the welded end (12).

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

5. The flat wire motor stator according to claim 1, characterized in that, The same-layer hairpin coil (131) includes a first coil body (1311) and a first bending portion (1312). The first coil body (1311) includes two parallel first through-slot portions (1311a) and a first connecting portion (1311b) connecting one end of the two first through-slot portions (1311a). The two first through-slot portions (1311a) of the same-layer hairpin coil (131) with a span of m are respectively inserted into the two stator slots (21) with a span of m. In the adjacent two layers of the same layer of the hairpin coil (131), the two first through slots (1311a) of the same layer with a span of n are respectively through the two adjacent layers of the two stator slots (21) with a span of n. The other ends of the two first through slots (1311a) are respectively connected to the first bending parts (1312). The two first bending parts (1312) are respectively bent along the circumference of the stator core (2), and the bending directions of the two first bending parts (1312) are the same.

6. The flat wire motor stator according to claim 1, characterized in that, The heterogeneous hairpin coil (132) includes a second coil body (1321) and a second bending portion (1322). The second coil body (1321) includes two parallel second through slot portions (1321a) and a second connecting portion (1321b) connecting one end of the two second through slot portions (1321a). The two second through slot portions (1321a) are respectively inserted in two adjacent layers of the two stator slots (21) with a span of n. The other end of the two second through slot portions (1321a) is respectively connected to the second bending portion (1322). The two second bending portions (1322) are respectively bent along the circumference of the stator core (2), and the bending directions of the two second bending portions (1322) are opposite.

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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