Stator assembly, motor, driving assembly and vehicle

Abstract

The invention discloses a stator assembly, a motor and a vehicle. The stator assembly is used for the motor, and the stator assembly comprises a stator core and a stator winding. Z stator grooves are distributed in the inner wall of the stator core in the circumferential direction, the stator grooves extend in the radial direction of the stator core, and N groove layers are arranged in each stator groove in the radial direction of the stator core. And the spanning directions of the coils in two adjacent stator slots spanning the stator slots in the same slot layer along the circumferential direction of the stator iron core are opposite. According to the stator assembly, the coils are oppositely arranged on the first slot layer or the Nth slot layer along the circumference of the stator core during winding wiring to cross the stator slots, so that interference between the coils can be avoided, the coil size and the material consumption are reduced, the production cost is reduced, and the size of the stator assembly is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator component, a motor, a drive assembly and a vehicle. Background Art

[0002] In motors of related art, it is usually necessary to increase the height difference between coils when wiring the motor windings to avoid interference between the coils. However, this will complicate the arrangement of the coils and increase the height of the coils, thereby increasing the overall volume of the stator assembly, using more materials, and increasing production costs. Summary of the invention

[0003] The embodiments of the present invention provide a stator assembly, a motor, a drive assembly and a vehicle to solve at least one of the above-mentioned technical problems.

[0004] A stator assembly according to an embodiment of the present invention is used in a motor. The stator assembly comprises a stator core and a stator winding.

[0005] Z stator slots are distributed on the inner wall of the stator core in the circumferential direction. The stator slots extend in the radial direction of the stator core. N slot layers are arranged in each stator slot in the radial direction of the stator core.

[0006] The coils in two adjacent stator slots in the same slot layer cross the stator slots in opposite directions along the circumferential direction of the stator core.

[0007] In the above-mentioned stator assembly, coils are arranged in opposite directions on the same slot layer along the circumference of the stator core to cross the stator slots during winding wiring, which can avoid interference between coils, thereby reducing the coil size and material usage, reducing production costs, and reducing the volume of the stator assembly.

[0008] In some embodiments, in two adjacent stator slots, the coils of the first slot layer of one stator slot and the first slot layer of the other stator slot have opposite spanning directions of the stator slots along the circumferential direction of the stator core, or

[0009] In two adjacent stator slots, the coils of the Nth slot layer of one stator slot and the Nth slot layer of the other stator slot have opposite spanning directions of the stator slots along the circumferential direction of the stator core.

[0010] In certain embodiments, in two adjacent stator slots, the coils in the first slot layer of one stator slot and the coils in the first slot layer of the other stator slot have opposite spanning directions of the stator slots along the circumferential direction of the stator core.

[0011] In some embodiments, in the same coil, the coil spans the first slot layer with a span of y, where y is the pole pitch of the motor.

[0012] In some embodiments, in the same coil, the coil spans the Nth slot layer with a span of y-1, y-1, and y-2 in sequence, where y is the pole pitch of the motor.

[0013] In certain embodiments, between two first slot layers and between two N-th slot layers, the coil spans in the same slot layer; and between adjacent slot layers from the first slot layer to the N-th slot layer, the coil spans in adjacent slot layers.

[0014] In some embodiments, the number of phases of the motor is equal to 3, the number of coils is consistent with the number of phases of the motor, the 3 phases include phase A, phase B and phase C, the corresponding lead-in ends of phase A, phase B and phase C differ by 2q stator slots in the circumferential direction, and the corresponding lead-out ends of phase A, phase B and phase C differ by 2q stator slots in the circumferential direction, where q is the number of slots per pole and per phase of the stator assembly.

[0015] In some embodiments of the lead-in end and the lead-out end, the coil includes a plurality of U-shaped hairpins connected in sequence, each of the U-shaped hairpins includes a connecting portion and two straight portions, the connecting portion respectively connects one end of the two straight portions, the U-shaped hairpins include same-layer U-shaped hairpins and cross-layer U-shaped hairpins, the two straight portions of the same-layer U-shaped hairpins penetrate into the same slot layer in different stator slots, and the two straight portions of the cross-layer U-shaped hairpins respectively penetrate into two adjacent slot layers in different stator slots.

[0016] In some embodiments, the two straight portions of the U-shaped hairpin on the same layer are bent in the same direction along the circumference of the stator core at one end away from the connecting portion to form a welding portion, and the U-shaped hairpin on the same layer includes a first U-shaped hairpin on the same layer, a second U-shaped hairpin on the same layer, and a third U-shaped hairpin on the same layer. The two straight portions of the first U-shaped hairpin on the same layer penetrate into the first slot layer in different stator slots, the two straight portions of the second U-shaped hairpin on the same layer penetrate into the Nth slot layer in different stator slots, and the two straight portions of the third U-shaped hairpin on the same layer penetrate into the Nth slot layer in different stator slots. The span of the first U-shaped hairpin on the same layer is y, the span of the second U-shaped hairpin on the same layer is y-1, and the span of the third U-shaped hairpin on the same layer is y-2.

[0017] In certain embodiments, the two straight portions of the cross-layer U-shaped hairpin are respectively bent in opposite directions along the circumference of the stator core to form welding portions, and the span of the cross-layer U-shaped hairpin is y.

[0018] A motor according to an embodiment of the present invention includes the stator assembly according to any one of the above embodiments.

[0019] A drive assembly according to an embodiment of the present invention includes the motor described in the above embodiment.

[0020] A vehicle according to an embodiment of the present invention includes the motor or drive assembly described in the above embodiment.

[0021] In the above-mentioned motor and vehicle, when wiring the windings of the stator assembly, the coils are arranged in opposite directions along the circumference of the stator core in the first slot layer or the Nth slot layer to cross the stator slots, which can avoid interference between the coils, thereby reducing the coil size and material usage, reducing production costs, and reducing the volume of the stator assembly.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 is a schematic structural diagram of a stator assembly according to an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a stator winding according to an embodiment of the present invention;

[0026] Figure 3 is a partial structural schematic diagram of a stator core according to an embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of a winding method of a stator winding according to an embodiment of the present invention;

[0028] Figure 5 is a schematic diagram of a winding method of the first branch of the A-phase of the stator winding according to an embodiment of the present invention;

[0029] Figure 6 is a schematic diagram of a winding method of the second branch of the A phase of the stator winding according to an embodiment of the present invention;

[0030] Figure 7 is a schematic structural diagram of a first same-layer U-shaped hairpin according to an embodiment of the present invention;

[0031] Figure 8 It is a schematic structural diagram of a second same-layer U-shaped hairpin according to an embodiment of the present invention;

[0032] Fig. 9 It is a structural schematic diagram of a third same-layer U-shaped hairpin according to an embodiment of the present invention;

[0033] Fig.10 2 is a schematic structural diagram of a first cross-layer U-shaped hairpin according to an embodiment of the present invention;

[0034] Fig.11 It is a schematic structural diagram of a second cross-layer U-shaped hairpin according to an embodiment of the present invention.

[0035] Description of main component symbols:

[0036] Stator assembly-10, stator core-12, stator winding-14, stator slot-16, slot layer-18, coil-20, slot opening-22, slot bottom-24, hairpin end-26, welding end-28, connecting portion-30, straight portion-32, welding portion-34, first same-layer U-shaped hairpin-36, second same-layer U-shaped hairpin-38, third same-layer U-shaped hairpin-40, first cross-layer U-shaped hairpin-42, second cross-layer U-shaped hairpin-44;

[0037] Motor - 100. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] The disclosure herein provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described herein. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art may appreciate the application of other processes and / or the use of other materials.

[0043] See also Figures 1 to 3 A stator assembly 10 according to an embodiment of the present invention includes a stator core 12 and a stator winding 14 .

[0044] Z stator slots 16 are distributed on the inner wall of the stator core 12 along the circumferential direction. The stator slots 16 extend in the radial direction of the stator core 12 . N slot layers 18 are arranged in each stator slot 16 along the radial direction of the stator core 12 .

[0045] The coils 20 in two adjacent stator slots 16 in the same slot layer 18 span the stator slots 16 in opposite directions along the circumferential direction of the stator core 12 .

[0046] In the above-mentioned stator assembly 10, the coils 20 are arranged in opposite directions across the stator slots 16 in the same slot layer 18 along the circumference of the stator core 12 during winding wiring, which can avoid interference between the coils 20, thereby reducing the size of the coils 20 and the amount of material used, reducing production costs, and reducing the volume of the stator assembly 10.

[0047] Specifically, Figure 3 As shown, the stator assembly 10 includes a stator core 12 and a stator winding 14, and the stator winding 14 is wound on the stator core 12. The stator core 12 is cylindrical, wherein the side of the stator core 12 close to the center of the cylinder is a slot 22, and the side away from the center of the cylinder is a slot bottom 24. Among the N slot layers 18, the slot 22 closest to the stator core 12 is the first slot layer 18, and the slot bottom 24 closest to the stator core 12 is the Nth slot layer 18. The stator winding 14 includes a coil 20, and N and Z are positive integers, and N≥2. Stator slots 16 are arranged along the direction from the slot opening 22 to the slot bottom 24 of the stator core 12. Each stator slot 16 may have a plurality of slot layers 18. It can be defined that along the direction from the slot opening 22 to the slot bottom 24 of the stator core 12 there are, in sequence, a first slot layer 18, a second slot layer 18, a third slot layer 18, and so on, the Nth slot layer 18.

[0048] The stator core 12 is provided with stator slots 16 , and the number of the stator slots 16 is denoted by Z.

[0049] The stator winding 14 includes coils 20, which are respectively inserted into different slot layers 18 of the stator slots 16 to form a branch. In each phase winding, there may be one or more branches, and the multiple branches are connected in parallel.

[0050] The coil 20 may include a plurality of U-shaped hairpins connected in sequence, and the U-shaped hairpins are made of flat wires. The U-shaped hairpins are arranged in the stator slots 16 of the stator core 12, and the two straight portions 32 of the same U-shaped hairpin do not need to be connected, which are hairpin ends 26, and the straight portions 32 of different U-shaped hairpins need to be welded to each other, which are welding ends 28.

[0051] The U-shaped hairpin needs to span a certain number of stator slots 16 on the stator core 12 and insert the two straight portions 32 into different stator slots 16. The number of stator slots 16 spanned by the U-shaped hairpin is the span of the U-shaped hairpin, also known as the pitch of the U-shaped hairpin. The straight portions 32 of different U-shaped hairpins are welded in series to form a coil 20.

[0052] The coil 20 crosses the stator slot 16 along the circumference of the stator core 12 on the stator slot 16. The coil 20 can cross the stator slot 16 in a clockwise direction or in a counterclockwise direction along the circumference of the stator core 12. If the stator slots 16 are numbered in a clockwise direction, when crossing from the first stator slot 16 to the second stator slot 16, the third stator slot 16, the fourth stator slot..., the coil 20 crosses the stator slot 16 in a clockwise direction. When crossing from the first stator slot 16 to the Zth stator slot 16, the Z-1th stator slot 16, the Z-2nd stator slot 16..., the coil 20 crosses the stator slot 16 in a counterclockwise direction.

[0053] When the coils 20 cross the first slot layer 18 or the Nth slot layer 18 of the stator core 12, if the coils 20 cross in the same direction, interference will occur between the coils 20. In order to avoid interference, the height of some coils 20 must be increased. The increased height of the coils 20 results in a larger volume of the stator assembly 10. At the same time, as the length of the coils 20 increases, the amount of material used to make the coils 20 also increases, resulting in high production costs.

[0054] In a stator assembly 10 according to an embodiment of the present invention, when the stator winding 14 is wired, the coils 20 in two adjacent stator slots 16 in the same slot layer 18 cross the stator slots 16 in opposite directions along the circumferential direction of the stator core 12 .

[0055] This can avoid interference between the coils 20. There is no need to increase the size of the coils 20, thereby reducing the size of the coils 20 and the amount of material used, reducing production costs, and reducing the volume of the stator assembly 10.

[0056] The crossing directions are opposite, that is, the coil 20 crosses the stator slots 16 along the stator core 12 in a clockwise direction and a counterclockwise direction respectively.

[0057] In one embodiment, each phase stator winding 14 has two branches, and the two branches are connected in parallel. In other embodiments, each phase stator winding 14 may have four branches, and the four branches are connected in parallel. The number of branches affects the current density. As the number of branches increases, the current density decreases. In practical applications, the appropriate number of branches can be set as needed.

[0058] The following description uses the stator assembly 10 for a 72-slot, 8-stage, 3-phase motor 100. The 3 phases are respectively denoted as phase A, phase B, and phase C. The number of slots in the stator core 12 is Z, and i, i∈[1, Z] represents the position of the stator slot 16 where the coil 20 is located. Each stator slot 16 has a total of 6 slot layers 18, which are denoted as a, b, c, d, e, and f layers along the direction from the slot opening 22 to the slot bottom 24. For example, 1f represents the 6th slot layer 18 of the 1st slot, and 20a represents the first slot layer 18 of the 20th slot.

[0059] In the same slot layer 18 , the coils 20 in two adjacent stator slots 16 in the same slot layer 18 cross the stator slots 16 in opposite directions along the circumferential direction of the stator core 12 .

[0060] Taking the wiring direction of the coil 20 in the first slot layer 18 of the 1st slot, the 2nd slot and the 3rd slot as an example, the coil 20 has opposite spanning directions 1a and 2a along the circumferential direction of the stator core 12, and opposite spanning directions 2a and 3a. In this way, interference between the coils 20 can be avoided.

[0061] At the same time, the directions of 1a and 3a are the same, but there is 2a as a gap between 1a and 3a, so the adjustable space is larger and interference can be avoided by staggering the front and back, so there will be no interference between 1a and 3a.

[0062] In some embodiments, in two adjacent stator slots 16, the coils 20 of the first slot layer 18 of one stator slot 16 and the first slot layer 18 of the other stator slot 16 have opposite spanning directions along the circumferential direction of the stator core 12 across the stator slots 16.

[0063] In two adjacent stator slots 16 , the coils 20 of the Nth slot layer 18 of one stator slot 16 and the Nth slot layer 18 of the other stator slot 16 have opposite spanning directions of the stator slots 16 along the circumferential direction of the stator core 12 .

[0064] In this way, interference between the coils 20 can be reduced.

[0065] Specifically, in the first slot layer 18 or the Nth slot layer 18, the crossing directions of the coils 20 in the adjacent stator slots 16 are opposite, so that the interference between the coils 20 can be reduced. Figure 5 and Figure 6 As shown, adjacent stator slots 16 in the first slot layer 18 or the Nth slot layer 18 of each phase have opposite span directions of the coils 20. For example, when the coils 20 span in the first slot layer 18, 1a→64a, 2a→11a, 3a→66a... The span directions of adjacent stator slots 16 in the first slot layer 18 are opposite, so the interference between the coils 20 is small, and the height of the coils 20 does not need to be increased.

[0066] This can avoid interference between the coils 20. There is no need to increase the size of the coils 20, thereby reducing the size of the coils 20 and the amount of material used, reducing production costs, and reducing the volume of the stator assembly 10.

[0067] In some embodiments, in two adjacent stator slots 16 , the coils 20 in the first slot layer 18 of one stator slot 16 and the coils 20 in the first slot layer 18 of the other stator slot 16 have opposite spanning directions along the circumferential direction of the stator core 12 .

[0068] This is effective in reducing interference between the coils 20 .

[0069] Specifically, the coils 20 in adjacent stator slots 16 in the first slot layer 18 have opposite span directions, thereby reducing interference between the coils 20. Figure 5 As shown, adjacent stator slots 16 are in the first slot layer 18 of each phase, and the crossing directions of the coils 20 are opposite. For example, when the coils 20 are crossing in the first slot layer 18, 1a→64a, 2a→11a, 3a→66a... The crossing directions of adjacent stator slots 16 in the first slot layer 18 are opposite, so the interference between the coils 20 is small, and the height of the coils 20 does not need to be increased.

[0070] In addition, the first slot layer 18 is close to the slot 22 of the stator core 12. The inner diameter of the first slot layer 18 is smaller, and the adjustable space of the coil 20 is smaller. If the coil 20 crosses the same layer in the first slot layer 18 with the same crossing direction, the coil 20 will need to be adjusted along the axial space for a larger distance to avoid interference between the coils. Therefore, in this embodiment, the crossing directions of the coils 20 in adjacent stator slots 16 in the first slot layer 18 are opposite, which is more effective in reducing interference between the coils 20.

[0071] In addition, in the present embodiment, the crossing direction of the coil 20 when crossing the same layer in the Nth slot layer 18 is not limited. On the one hand, since the inner diameter of the position where the Nth slot layer 18 is located is relatively large, the space for adjusting the position of the coil 20 is relatively large, and even if it crosses in the same direction, the height of the coil 20 will not be excessively increased. On the other hand, in the actual winding process, it is difficult to satisfy that the directions of the same layer crossing of the first slot layer 18 of two adjacent stator slots 16 are opposite while satisfying that the directions of the same layer crossing of the Nth slot layer 18 of two adjacent stator slots 16 are also opposite. Therefore, for the convenience of winding, the crossing direction of the coil 20 when crossing the same layer in the Nth slot layer 18 is not limited.

[0072] In some embodiments, in the same coil 20 , the coil 20 spans the first slot layer 18 with a span of y, where y is the pole pitch of the motor 100 .

[0073] In this way, the coils 20 span the first slot layer 18 in the stator slot 16 in the same direction and with the same span, and the winding method is simple.

[0074] Specifically, the pole pitch y represents the distance between two adjacent magnetic poles on the armature surface of the motor 100, y=Z / (2p), where Z is the number of slots of the motor 100, p is the number of pole pairs of the motor 100, and 2p is the number of poles of the motor 100.

[0075] In the 72-slot, 8-pole, 3-phase motor 100, y=Z / (2p)=72 / 8=9. That is, the span of the coil 20=y=9. The coil 20 spans the stator slots 16 with 9 spans in the ath slot layer 18. For example, the two straight portions 32 of the coil 20 are respectively in the first stator slot 16 and the tenth stator slot 16.

[0076] In one embodiment, if Figure 5 and Figure 6 As shown, the winding line of the first branch of phase A is:

[0077] 1f→65f→56e→47d→38c→29b→20a→29a→38b→47c→56d→65e→2f→66f→57e→48d→39c→30b→21a→12a→21b→30c→39d→48e→57f→64f→55e→46d→37c→28b→19a→10a→19b→28c→37d→46 e→55f→47f→38e→29d→20c→11b→2a→11a→20b→29c→38d→47e→56f→48f→39e→30d→21c→12b→3a→66a→3b→12c→21d→30e→39f→46f→37e→28d→19c→10b→1a→64a→1b→10c→19d→28e.

[0078] The second branch winding line of phase A is: 37f→29f→20e→11d→2c→65b→56a→65a→2b→11c→20d→29e→38f→30f→21e→12d→3c→66b→57a→48a→57b→66c→3d→12e→21f→28f→19e→10d→1c→64b→55a→46a→55b→64c→1 d→10e→19f→11f→2e→65d→56c→47b→38a→47a→56b→65c→2d→11e→20f→12f→3e→66d→57c→48b→39a→30a→39b→48c→57d→66e→3f→10f→1e→64d→55c→46b→37a→28a→37b→46c→55d→64e.

[0079] In the above-mentioned A-phase first branch and A-phase second branch winding lines, each time the coil 20 crosses the a layer, the span is 9.

[0080] In some embodiments, in the same coil 20 , the coil 20 sequentially spans the Nth slot layer 18 with a span of y-1, y-1, and y-2, where y is the pole pitch of the motor 100 .

[0081] In this way, the span of the coil 20 is short, so that the height of the coil 20 can be reduced while avoiding interference between the coils 20 .

[0082] Specifically, in the Nth slot layer 18, the coil 20 sequentially crosses the Nth slot layer 18 with a span of y-1, y-1, and y-2. In the case of y=9, the coil 20 sequentially crosses the Nth slot layer 18 with a span of 8, 8, and 7.

[0083] In the above-mentioned A-phase first branch and A-phase second branch winding lines, when the coil 20 crosses f layers for the first time, the span is 8; when it crosses f layers for the second time, the span is 8; when it crosses f layers for the third time, the span is 7. When it crosses f layers for the fourth, fifth, and sixth times, the spans are 8, 8, and 7, respectively. The short span of the coil 20 can reduce the height of the coil 20 while avoiding interference between the coils 20.

[0084] In some embodiments, between the two first slot layers 18 and the two Nth slot layers 18 , the coil 20 spans in the same slot layer 18 , and between adjacent slot layers from the first slot layer to the Nth slot layer 18 , the coil 20 spans in adjacent slot layers 18 .

[0085] In this way, the coil 20 is wound in the N slot layers 18 to form a complete branch.

[0086] Specifically, Figure 4 As shown, the coil 20 is wound in the 72 stator slots 16 of the stator core 12, and each stator slot 16 has a, b, c, d, e and f layers in the direction from the slot opening 22 to the slot bottom 24. The coil 20 spans the same layer in the a layer and the f layer coil 20, and the coil 20 spans in two adjacent slot layers 18 in the a layer to the f layer. In the a layer, the span of the coil 20 is 9; in the a layer to the f layer, the span of the coil 20 is also 9; in the f layer, the spans of the coil 20 are 8, 8 and 7 in sequence. In the first slot layer 18 and the Nth slot layer 18, the coil 20 spans in the same slot layer 18, and in the first slot layer 18 to the Nth slot layer 18, the coil 20 spans in the adjacent slot layers 18, and the winding forms a complete branch.

[0087] In some embodiments, the number of phases of the motor 100 is equal to 3, and the number of coils 20 is consistent with the number of the motor 100. The three phases include phase A, phase B, and phase C, and the corresponding lead-in ends of phase A, phase B, and phase C differ by 2q stator slots 16 in the circumferential direction, and the corresponding lead-out ends of phase A, phase B, and phase C differ by 2q stator slots 16 in the circumferential direction, where q is the number of slots per pole and per phase of the stator assembly 10.

[0088] In this way, the lead-in ends of the three-phase stator winding 14 can be close to each other for easy connection.

[0089] Specifically, when the stator assembly 10 is used for a motor 100 with Z slots, 2p poles, and m phases, the number of slots per pole and per phase of the motor 100 can be defined as q, and q=Z / (2mp). In a motor 100 with 72 slots, 8 poles, and 3 phases, q=Z / (2mp)=72 / (3×8)=3. That is, the lead-in ends corresponding to the A phase, the B phase, and the C phase differ by 6 stator slots 16 in the circumferential direction, and the lead-out ends corresponding to the A phase, the B phase, and the C phase differ by 6 stator slots 16 in the circumferential direction.

[0090] like Figure 4 As shown, the lead-out end of the first branch terminal of phase A is A1, the lead-out end of the second branch terminal of phase A is A2, the lead-out end of the first branch terminal of phase B is B1, the lead-out end of the second branch terminal of phase B is B2, the lead-out end of the first branch terminal of phase C is C1, and the lead-out end of the second branch terminal of phase C is C2. The lead-in end of the first branch of phase A is X1, the lead-in end of the second branch of phase A is X2, the lead-in end of the first branch of phase B is Y1, the lead-in end of the second branch of phase B is Y2, the lead-in end of the first branch of phase C is Z1, and the lead-in end of the second branch of phase C is Z2. The lead-in ends and lead-out ends of phase A, phase B, and phase C are used for parallel connection between branches and connection with other parts of the motor 100.

[0091] The first branch and the second branch of the B phase are respectively wound with 2q stator slots 16 added to the first branch and the second branch of the A phase, that is, 6 stator slots 16 are added.

[0092] For example, Figure 4 As shown, the winding line of the first branch of phase B is: 7f→71f→62e→53d→44c→35b→26a→35a→44b→53c→62d→71e→8f→72f→63e→54d→45c→36b→27a→18a→27b→36c→45d→54e→63f→70f→61e→52d→43c→34b→25a→16a→25b→34 c→43d→52e→61f→53f→44e→35d→26c→17b→8a→17a→26b→35c→44d→53e→62f→54f→45e→36d→27c→18b→9a→72a→9b→18c→27d→36e→45f→52f→43e→34d→25c→16b→7a→70a→7b→16c→25d→34e.

[0093] The first branch and the second branch of the C phase are respectively wound with 2q stator slots 16 added to the first branch and the second branch of the B phase, that is, 6 stator slots 16 are added.

[0094] For example, Figure 4As shown, the line of the first branch winding of phase C is: 13f→5f→68e→59d→50c→41b→32a→41a→50b→59c→68d→5e→14f→6f→69e→60d→51c→42b→33a→24a→33b→42c→51d→60e→69f→4f→67e→58d→49c→40b→31a→22a→31b→40c→ 49d→58e→67f→59f→50e→41d→32c→23b→14a→23a→32b→41c→50d→59e→68f→60f→51e→42d→33c→24b→15a→6a→15b→24c→33d→42e→51f→58f→49e→40d→31c→22→13a→4a→13b→22c→31d→40e.

[0095] In some embodiments, the coil 20 includes a plurality of U-shaped hairpins connected in sequence, each U-shaped hairpin includes a connecting portion 30 and two straight portions 32, the connecting portion 30 respectively connects one end of the two straight portions 32, the U-shaped hairpin includes a same-layer U-shaped hairpin and a cross-layer U-shaped hairpin, the two straight portions 32 of the same-layer U-shaped hairpin penetrate into the same slot layer 18 in different stator slots 16, and the two straight portions 32 of the cross-layer U-shaped hairpin respectively penetrate into two adjacent slot layers 18 in different stator slots 16.

[0096] In this way, the coil 20 can be made to cross over the same slot layer 18 and two adjacent slot layers 18 to complete the winding of the branch circuit.

[0097] Specifically, the same-layer U-shaped hairpin 20 is used to span in the same slot layer 18, and the cross-layer U-shaped hairpin 20 is used to span between two adjacent slot layers 18. Both the same-layer U-shaped hairpin 20 and the cross-layer U-shaped hairpin 20 can have different spans to span different stator slots 16 in the same slot layer 18 or between two adjacent slot layers 18.

[0098] See also Figures 7 to 9 In some embodiments, the two straight portions 32 of the same-layer U-shaped hairpin are bent in the same direction along the circumference of the stator core 12 at one end away from the connecting portion 30 to form a welding portion 34. The same-layer U-shaped hairpin includes a first same-layer U-shaped hairpin 36, a second same-layer U-shaped hairpin 38 and a third same-layer U-shaped hairpin 40. The two straight portions 32 of the first same-layer U-shaped hairpin 36 penetrate into the first slot layer 18 in different stator slots 16, the two straight portions 32 of the second same-layer U-shaped hairpin 38 penetrate into the Nth slot layer 18 in different stator slots 16, and the two straight portions 32 of the third same-layer U-shaped hairpin 40 penetrate into the Nth slot layer 18 in different stator slots 16. The span of the first same-layer U-shaped hairpin 36 is y, the span of the second same-layer U-shaped hairpin 38 is y-1, and the span of the third same-layer U-shaped hairpin 40 is y-2.

[0099] In this way, when different coils 20 have different span directions and spans, the welding portions 34 of different coils 20 can be welded toward each other to achieve series connection between the coils 20 .

[0100] Specifically, the first same-layer U-shaped hairpin 36 spans the same layer in the first slot layer 18. The second same-layer U-shaped hairpin 38 and the third same-layer U-shaped hairpin 40 span the same layer in the Nth slot layer 18. The span of the coil 20 is short, and the height of the coil 20 at the hairpin end 26 can be controlled. In the a layer, the span of the coil 20 is 9; in the f layer, the spans of the coil 20 are 8, 8, and 7, respectively. Therefore, the first same-layer U-shaped hairpin 36 with a span of 9 can be used for wiring in the a layer, and the second same-layer U-shaped hairpin 38 with a span of 8 and the third same-layer U-shaped hairpin 40 with a span of 7 can be used for wiring in the f layer.

[0101] See also Figure 10 to Figure 11 In some embodiments, the two straight portions 32 of the cross-layer U-shaped hairpin are respectively bent in opposite directions along the circumference of the stator core 12 to form welding portions 34, and the span of the cross-layer U-shaped hairpin is y.

[0102] In this way, when different coils 20 have different span directions and spans, the welding portions 34 of different coils 20 can be welded toward each other to achieve series connection between the coils 20 .

[0103] Specifically, the cross-layer U-shaped hairpin 20 includes a first cross-layer U-shaped hairpin 42 and a second cross-layer U-shaped hairpin 44. The span of the first cross-layer U-shaped hairpin 42 and the second cross-layer U-shaped hairpin 44 is 9, and the distance between the two straight portions 32 of the first cross-layer U-shaped hairpin 42 is smaller than the distance between the two straight portions 32 of the second cross-layer U-shaped hairpin 44.

[0104] In a branch, according to the different positions of the slot layers 18 spanned by the coil 20, an appropriate coil 20 is selected, and all the coils 20 in the branch are connected in series, so that the wiring of a branch can be completed. From layer b to layer e, the span of the coil 20 is 9, from layer b to layer c, the first cross-layer U-shaped hairpin 42 is used for wiring, and from layer d to layer e, the second cross-layer U-shaped hairpin 44 is used for wiring.

[0105] For example, Figure 5As shown, in the first branch of phase A, there are 37c→28b→19a→10a→19b→28c, the first same-layer U-shaped hairpin 36 spans from 19a to 10a, one straight portion 32 of the first same-layer U-shaped hairpin 36 is at the a layer in the 19th stator slot 16, and the other straight portion 32 is at the a layer in the 10th stator slot 16, the welding portions 34 of the same-layer U-shaped hairpin 20 are bent to the right in the figure, the coils 20 of 19a and 28b are welded and connected, and the coils 20 of 10a and 19b are welded and connected. The coil 20 at 28b is a cross-layer U-shaped hairpin 20, and the two straight portions 32 of the coil 20 are respectively at 28b and 37c, and the coil 20 at 19b is a cross-layer U-shaped hairpin 20, and the two straight portions 32 of the coil 20 are respectively at 19b and 28c. The two straight portions 32 of the cross-layer U-shaped hairpin 20 are bent to the left and right in the figure to form welding portions 34. The welding portion 34 of the coil 20 at 10a is bent to the right, and the welding portion 34 of the coil 20 at 19b is bent to the left; the welding portion 34 of the coil 20 at 19a is bent to the right, and the welding portion 34 of the coil 20 at 28b is bent to the left, so that the two welding portions 34 that need to be welded and connected can be in contact, so that the series connection between the coils 20 is realized by welding.

[0106] For example, Figure 5 As shown, in the first branch of phase A, there are 38d→47e→56f→48f→39e→30d, the second same-layer U-shaped hairpin 38 spans from 56f to 48f, one straight portion 32 of the second same-layer U-shaped hairpin 38 is at the f layer in the 56th stator slot 16, and the other straight portion 32 is at the f layer in the 48th stator slot 16, the welding portions 34 of the same-layer U-shaped hairpin 20 are all bent to the left in the figure, 56f is welded to the coil 20 of 47e, and 48f is welded to the coil 20 of 39e. The coil 20 at 47e is a cross-layer U-shaped hairpin 20, and the two straight portions 32 of the coil 20 are respectively at 47e and 38d, and the coil 20 at 39e is a cross-layer U-shaped hairpin 20, and the two straight portions 32 of the coil 20 are respectively at 39e and 30d. The two straight portions 32 of the cross-layer U-shaped hairpin 20 are bent to the left and right in the figure to form welding portions 34. The welding portion 34 of the coil 20 at 56f is bent to the left, and the welding portion 34 of the coil 20 at 47e is bent to the right; the welding portion 34 of the coil 20 at 48f is bent to the left, and the welding portion 34 of the coil 20 at 39e is bent to the right, so that the two welding portions 34 that need to be welded and connected can be in contact, so that the series connection between the coils 20 is realized by welding.

[0107] In summary, according to the above-mentioned winding method of the stator winding 14, firstly, the maximum span of the coil 20 is 9. After wiring, the height of the stator assembly 10 at the hairpin end 26 can be effectively reduced, thereby reducing the height of the motor 100. At the same time, the material required to make the coil 20 is reduced, which can effectively reduce the manufacturing cost.

[0108] Secondly, there are 5 types of coils 20 in total, and the types of coils 20 required for winding are small, the hairpin molding is simple, the required equipment is small, and mass production is easy to achieve.

[0109] Finally, the stator winding 14 formed by the above wiring method has a welding point only on the welding end 28, and no welding is required on the hairpin end 26. The welding process is simple and convenient, and can avoid failure of the motor 100 due to damage to the enameled wire insulation layer of the coil 20 at the hairpin end 26 during the welding process.

[0110] In one embodiment, the stator winding 14 may be wound in the above manner to reduce the height by 3 mm, thereby effectively reducing the height of the motor 100 .

[0111] A motor 100 according to an embodiment of the present invention includes a stator assembly 10 according to any one of the above embodiments.

[0112] A vehicle according to an embodiment of the present invention includes the motor 100 according to the above embodiment.

[0113] In the above-mentioned motor 100 and vehicle, when wiring the windings of the stator assembly 10, the coils 20 are arranged in opposite directions along the circumference of the stator core 12 in the first slot layer 18 or the Nth slot layer 18 to cross the stator slots 16, which can avoid interference between the coils 20, thereby reducing the size of the coils 20 and the amount of material used, reducing production costs, and reducing the volume of the stator assembly 10.

[0114] Specifically, vehicles include but are not limited to pure electric vehicles, hybrid vehicles, extended-range electric vehicles, and the like.

[0115] It should be noted that the above explanations of the implementation and beneficial effects of the stator assembly 10 are also applicable to the motor 100 and the vehicle according to the implementation of the present invention, and will not be elaborated here in detail to avoid redundancy.

[0116] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0117] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A stator assembly for a motor, characterized in that: The stator assembly includes a stator core and a stator winding; Z stator slots are distributed on the inner wall of the stator core in the circumferential direction, and the stator slots all extend in the radial direction of the stator core, and each stator slot is provided with N slot layers in the radial direction of the stator core; The coils in two adjacent stator slots in the same slot layer cross the stator slots in opposite directions along the circumferential direction of the stator core.

2. The stator assembly according to claim 1, characterized in that: In two adjacent stator slots, the coils of the first slot layer of one stator slot and the first slot layer of the other stator slot have opposite spanning directions along the circumferential direction of the stator core across the stator slots, or In two adjacent stator slots, the coils of the Nth slot layer of one stator slot and the Nth slot layer of the other stator slot have opposite spanning directions of the stator slots along the circumferential direction of the stator core.

3. The stator assembly according to claim 1, characterized in that: In two adjacent stator slots, the coils in the first slot layer of one stator slot and the coils in the first slot layer of the other stator slot have opposite spanning directions along the circumferential direction of the stator core across the stator slots.

4. The stator assembly according to claim 1, characterized in that: In the same coil, the coil spans the first slot layer with a span of y, where y is the pole pitch of the motor.

5. The stator assembly according to claim 1, characterized in that: In the same coil, the coil sequentially spans the Nth slot layer with a span of y-1, y-1, and y-2, where y is the pole pitch of the motor.

6. The stator assembly according to claim 1, characterized in that Between the two first slot layers and between the two Nth slot layers, the coil spans in the same slot layer; between the adjacent slot layers from the first slot layer to the Nth slot layer, the coil spans in the adjacent slot layers.

7. The stator assembly according to claim 1, characterized in that The number of phases of the motor is equal to 3, and the number of coils is consistent with the number of phases of the motor. The 3 phases include phase A, phase B and phase C. The corresponding lead-in ends of phase A, phase B and phase C differ by 2q stator slots in the circumferential direction, and the corresponding lead-out ends of phase A, phase B and phase C differ by 2q stator slots in the circumferential direction, where q is the number of slots per pole and per phase of the stator assembly.

8. The stator assembly according to claim 1, characterized in that The coil includes a plurality of U-shaped hairpins connected in sequence, each of the U-shaped hairpins includes a connecting portion and two straight portions, the connecting portion respectively connects one end of the two straight portions, the U-shaped hairpins include same-layer U-shaped hairpins and cross-layer U-shaped hairpins, the two straight portions of the same-layer U-shaped hairpins penetrate into the same slot layer in different stator slots, and the two straight portions of the cross-layer U-shaped hairpins respectively penetrate into two adjacent slot layers in different stator slots.

9. The stator assembly according to claim 8, characterized in that The two straight portions of the U-shaped hairpin on the same layer are bent in the same direction along the circumference of the stator core at one end away from the connecting portion to form a welding portion. The U-shaped hairpin on the same layer includes a first U-shaped hairpin on the same layer, a second U-shaped hairpin on the same layer and a third U-shaped hairpin on the same layer. The two straight portions of the first U-shaped hairpin on the same layer penetrate into the first slot layer in different stator slots, the two straight portions of the second U-shaped hairpin on the same layer penetrate into the Nth slot layer in different stator slots, the two straight portions of the third U-shaped hairpin on the same layer penetrate into the Nth slot layer in different stator slots, the span of the first U-shaped hairpin on the same layer is y, the span of the second U-shaped hairpin on the same layer is y-1, and the span of the third U-shaped hairpin on the same layer is y-2.

10. The stator assembly according to claim 8, characterized in that The two straight portions of the cross-layer U-shaped hairpin are respectively bent in opposite directions along the circumferential direction of the stator core to form welding portions, and the span of the cross-layer U-shaped hairpin is y.

11. A motor, characterized in that: The stator assembly comprises the stator assembly according to any one of claims 1 to 10.

12. A drive assembly, characterized in that: Includes the motor as claimed in claim 11.

13. A vehicle, characterized in that: Includes the motor as claimed in claim 11, or the drive assembly as claimed in claim 12.

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