A compact winding end flat wire motor and stator assembly thereof

Abstract

The present invention relates to the technical field of flat wire motors, and in particular to a compact flat wire motor with winding ends and a stator assembly thereof. The stator assembly comprises a stator core and a stator winding; the stator core is provided with A stator slots, which are arranged in sequence along the circumferential direction of the stator core in a circular array; each stator slot is provided with B layers of rectangular conductors along the radial direction of the stator core; the stator winding has a span of C along the circumferential direction of the stator core at the hairpin end; the stator winding has a span of F along the radial direction of the stator core at the hairpin end. The winding method adopted by the motor stator winding proposed in the present invention reduces the types of parts of the stator assembly and makes the winding end more compact; the stator assembly has a simple structure, a simple process, is easy to process, and is convenient for mass production.

Description

Technical Field

[0001] The invention belongs to the technical field of flat wire motors, and in particular relates to a compact winding end flat wire motor and a stator assembly thereof. Background Art

[0002] Flat wire motors are a type of motor that major motor manufacturers and developers are currently researching. There are many winding methods, and different windings correspond to different U-shaped wires.

[0003] The existing U-shaped wires of flat wire motor windings have problems such as too many wire types, complex forming, and too long ends, which also leads to the difficulty and high cost of the motor winding manufacturing process. Summary of the invention

[0004] In view of the above problems, the present invention provides a stator assembly of a compact winding-end flat wire motor, the stator assembly comprising a stator core and a stator winding;

[0005] The stator core is provided with A stator slots, which are arranged in sequence along the circumferential direction of the stator core in a circular array; each stator slot is provided with B layers of rectangular conductors along the radial direction of the stator core;

[0006] The stator winding has a span C along the circumference of the stator core at the hairpin end;

[0007] The stator winding has F layers at the hairpin end along the radial direction of the stator core;

[0008] The stator winding has a span along the circumference of the stator core at the welding end: the span of the first layer of rectangular conductors in the circumference of the stator core is D; the span of the remaining rectangular conductors except the first layer of rectangular conductors in the circumference of the stator core is E;

[0009] The stator winding is connected at the welding end in a cross-layer manner along the radial direction of the stator core.

[0010] The ends of the first layer of rectangular conductors are twisted left and right according to the stator slots, and after twisting, the two first layer rectangular conductors with adjacent ends are welded; the ends of the B layer of rectangular conductors are twisted left and right according to the stator slot groups, and after twisting, the two B layer of rectangular conductors with adjacent ends are welded; the ends of the remaining layers of rectangular conductors are twisted left and right according to the layers, and after twisting, the two rectangular conductors with adjacent ends in the same layer group are welded;

[0011] Among them, D=(C-1) / 2; E=C / 2; A and B are both even numbers, B≥4, C is a multiple of 3, and A / C is an integer, and F is 2 or 3 or 4.

[0012] Furthermore, the stator core is provided with 48 stator slots, and each stator slot can be provided with 8 layers of rectangular conductors.

[0013] Furthermore, the span of the stator winding at the hairpin end along the circumferential direction of the stator core is 6; the number of span layers of the stator winding at the hairpin end along the radial direction of the stator core is 2.

[0014] Furthermore, the span of the stator winding at the welding end along the circumferential direction of the stator core includes: the span of the first layer of rectangular conductors in the circumferential direction of the stator core is 2.5; the span of the remaining rectangular conductors except the first layer of rectangular conductors in the circumferential direction of the stator core is 3;

[0015] The stator winding has a cross-layer connection method along the radial direction of the stator core at the welding end, including: the end of the first-layer rectangular conductor is twisted left and right according to the stator slot, and after the twist, the two first-layer rectangular conductors with adjacent ends are welded; the end of the eighth-layer rectangular conductor is twisted left and right according to the stator slot group, and after the twist, the two eighth-layer rectangular conductors with adjacent ends are welded; the end of the remaining layers of rectangular conductors are twisted left and right according to the layer, and after the twist, the two rectangular conductors with adjacent ends in the same layer group are welded.

[0016] Furthermore, the left-right twisting according to the stator slots means that the ends of the first layer of rectangular conductors in two adjacent stator slots have opposite twisting directions;

[0017] The left-right twisting according to the stator slot group means that the ends of the two B-th layer rectangular conductors in the same stator slot group are twisted in the same direction, and the ends of the B-th layer rectangular conductors in two adjacent stator slot groups are twisted in opposite directions;

[0018] The layer-by-layer left and right twisting means that the ends of the rectangular conductors in the same layer are twisted in the same direction, while the ends of the rectangular conductors in adjacent layers are twisted in opposite directions.

[0019] Furthermore, the star point line and three-phase lead-out lines of each phase in the stator winding are all led out from the welding end.

[0020] The present invention also provides a compact winding end flat wire motor, comprising a rotor assembly and the above-mentioned stator assembly, wherein the rotor assembly is located inside the stator assembly.

[0021] The beneficial effects of the present invention are as follows: the winding method adopted by the motor stator winding proposed by the present invention reduces the types of stator component parts and makes the winding ends more compact; the stator component has a simple structure, simple process, easy processing, and is convenient for mass production.

[0022] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of a stator assembly according to an embodiment of the present invention at a first viewing angle is shown;

[0025] Figure 2 A partial cross-sectional view of a stator core according to an embodiment of the present invention is shown;

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

[0027] Figure 4 A top view of a stator assembly at a card issuing end of an embodiment of the present invention is shown;

[0028] Figure 5 A partial schematic diagram showing the connection mode of the 1st to 4th layer rectangular conductors at the hairpin end of an embodiment of the present invention;

[0029] Figure 6 A partial schematic diagram showing the connection mode of the 5th to 8th layer rectangular conductors at the hairpin end of an embodiment of the present invention;

[0030] Figure 7 A schematic structural diagram of a stator assembly according to an embodiment of the present invention at a second viewing angle is shown;

[0031] Figure 8 Shows Figure 7 A magnified schematic diagram of part A in FIG.

[0032] Fig. 9 A schematic structural diagram of a stator assembly according to an embodiment of the present invention is shown in a third viewing angle;

[0033] Fig.10 Shows Fig. 9 A magnified schematic diagram of part B in FIG.

[0034] Fig.11 A schematic diagram of a U-shaped line structure corresponding to the first and third layers of rectangular conductors of an embodiment of the present invention is shown;

[0035] Fig.12 A schematic diagram of a U-shaped line structure corresponding to the second and fourth layers of rectangular conductors of an embodiment of the present invention is shown;

[0036] Fig.13A schematic diagram of a U-shaped line structure corresponding to the 5th and 7th layers of rectangular conductors of an embodiment of the present invention is shown;

[0037] Fig.14 A schematic diagram of the U-shaped line structure corresponding to the 6th and 8th layers of rectangular conductors in an embodiment of the present invention is shown.

[0038] In the figure: 100 - stator core; 200 - hairpin end; 300 - welding end; 400 - stator slot; 500 - rectangular conductor. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] An embodiment of the present invention provides a compact winding end flat wire motor, comprising a rotor assembly and a stator assembly, wherein the rotor assembly is located inside the stator assembly.

[0041] Specifically, Figure 1-Figure 14 As shown, the stator assembly includes a stator core 100 and a stator winding; the stator core 100 is generally cylindrical, so as to accommodate the motor rotor assembly in the stator core 100. The stator core 100 is provided with a plurality of stator slots 400, which are arranged in sequence along the circumferential direction of the stator core 100 in a circular array. The winding of the stator winding adopts a rectangular conductor 500, and the winding is evenly and symmetrically arranged in the stator slots 400.

[0042] Specifically, the stator winding includes an in-slot winding and an end winding. The in-slot winding refers to a rectangular conductor 500 arranged in a stator slot 400, and each stator slot 400 is provided with multiple layers of rectangular conductors 500 in sequence along the radial direction of the stator core 100. The function of the end winding is to pair up at a certain span and connect the rectangular conductors 500 at different positions in different stator slots 400 to achieve the internal connection of the stator winding. The end winding is distributed on both sides of the stator core 100, which are the hairpin end 200 and the welding end 300 respectively; the star point line and the three-phase lead wire of each phase in the stator winding are all led out from the welding end 300, and the three-phase lead wire is located on the axial upper side of the welding end 300.

[0043] Furthermore, the winding method of the stator winding is jointly determined by the connection method of the stator winding at the hairpin end and the connection method of the stator winding at the welding end.

[0044] Among them, the connection mode of the stator winding at the hairpin end includes: the span of the stator winding at the hairpin end along the circumferential direction of the stator core, and the cross-layer connection mode of the stator winding at the hairpin end along the radial direction of the stator core.

[0045] The connection modes of the stator winding at the welding end include: the span of the stator winding at the welding end along the circumferential direction of the stator core, and the cross-layer connection mode of the stator winding at the welding end along the radial direction of the stator core.

[0046] Specifically, the two rectangular conductors in the slot winding are connected through a hairpin end or a welding end, and along the circumference of the stator core, the number of stator slots between the two rectangular conductors plus one represents the span of the two rectangular conductors at the hairpin end or the welding end.

[0047] The cross-layer connection method is generally expressed by the number of cross-layers. When two rectangular conductors in the slot winding are connected through a hairpin end or a welding end, the number of rectangular conductor layers between the two rectangular conductors along the radial direction of the stator core is increased by one, indicating the number of cross-layers of the two rectangular conductors at the hairpin end or the welding end. It should be noted that there is no cross-layer number when connecting rectangular conductors of the same layer. Different layer-slot matching methods correspond to different winding paths.

[0048] In the embodiment of the present invention, the stator core is provided with A stator slots; and each stator slot is provided with B layers of rectangular conductors along the radial direction of the stator core.

[0049] For the convenience of description, in the embodiment of the present invention, a layer of rectangular conductors closest to the outer wall of the stator core is defined as the first layer of rectangular conductors; a layer of rectangular conductors closest to the axis of the stator core is defined as the Bth layer of rectangular conductors; along one circumference of the stator core, two adjacent stator slots are defined as a stator slot group, that is, all stator slots on the stator core can be divided into A / 2 stator slot groups; from the outer wall of the stator core to the axis of the stator core, among the remaining rectangular conductors except the first layer of rectangular conductors and the Bth layer of rectangular conductors, two adjacent layers of rectangular conductors are defined as a layer group, that is, each stator slot can be divided into (B-2) / 2 layer groups.

[0050] Specifically, the span of the stator winding at the hairpin end along the circumferential direction of the stator core is C.

[0051] The number of layers of the stator winding at the hairpin end along the radial direction of the stator core is F.

[0052] The span of the stator winding at the welding end along the circumferential direction of the stator core includes: the span of the first layer of rectangular conductors in the circumferential direction of the stator core is D; the span of the remaining rectangular conductors except the first layer of rectangular conductors in the circumferential direction of the stator core is E.

[0053] The stator winding is connected across layers along the radial direction of the stator core at the welding end, including:

[0054] The ends of all first-layer rectangular conductors are twisted left and right according to the stator slots, and after twisting, two first-layer rectangular conductors with adjacent ends are welded; specifically, twisting left and right according to the stator slots means that the ends of the first-layer rectangular conductors in two adjacent stator slots are twisted in opposite directions;

[0055] The ends of all B-layer rectangular conductors are twisted left and right according to the stator slot groups. After twisting, two B-layer rectangular conductors with adjacent ends are welded. Specifically, twisting left and right according to the stator slot groups means that the ends of two B-layer rectangular conductors in the same stator slot group are twisted in the same direction, and the ends of the B-layer rectangular conductors in two adjacent stator slot groups are twisted in opposite directions.

[0056] The ends of the rectangular conductors of the remaining layers are twisted left and right according to the layers. After twisting, the two adjacent rectangular conductors in the same layer group are welded. Specifically, twisting left and right according to the layers means that the ends of the rectangular conductors in the same layer are twisted in the same direction, and the ends of the rectangular conductors in adjacent layers are twisted in opposite directions.

[0057] Among them, D=(C-1) / 2; E=C / 2; A and B are both even numbers, B≥4, C is a multiple of 3, and A / C is an integer, and F is 2 or 3 or 4.

[0058] It should be noted that at the welding end, the ends of the rectangular conductors corresponding to the star point line and the lead-out terminals are not welded.

[0059] The compact flat wire motor with winding ends proposed in the embodiment of the present invention adopts the above winding method, requires fewer U-shaped wire types, and has a simple structure and is easy to process. This makes the stator assembly have fewer parts, the winding ends are compact, the structure is simple, the overall production process is simple, and it is easy to mass produce.

[0060] For example, Figure 1-14 As shown, the stator core of the stator assembly is provided with 48 stator slots, and each stator slot can be provided with 8 layers of rectangular conductors; the span of the stator winding at the hairpin end along the circumferential direction of the stator core is 6. That is, A=48, B=8, C=6. Along one direction of the circumferential direction of the stator core, the stator slots are numbered in sequence, and are recorded as No. 1, No. 2, No. 3, ..., No. 48 stator slots, such as Figure 5 As shown; in the same stator slot, along the outer side to the inner side of the stator core, the rectangular conductors are numbered in sequence, and are respectively recorded as the 1st layer, the 2nd layer, the 3rd layer, ..., the 8th layer of rectangular conductors, as shown in FIG. Figure 3 described.

[0061] At the hairpin end, along the circumferential direction of the stator core, the span of all rectangular conductors in the stator winding is 6; the number of span layers of the stator winding along the radial direction of the stator core at the hairpin end is 2, but not limited to 2.

[0062] For example, Figure 5 and Figure 6 As shown, at the hairpin end, the first layer of rectangular conductor in the No. 1 stator slot is connected to the third layer of conductor in the No. 7 stator slot; the second layer of rectangular conductor in the No. 1 stator slot is connected to the fourth layer of rectangular conductor in the No. 7 stator slot; the third layer of rectangular conductor in the No. 1 stator slot is connected to the first layer of rectangular conductor in the No. 43 stator slot; the fourth layer of rectangular conductor in the No. 1 stator slot is connected to the second layer of rectangular conductor in the No. 43 stator slot; the fifth layer of rectangular conductor in the No. 1 stator slot is connected to the seventh layer of rectangular conductor in the No. 7 stator slot; the sixth layer of rectangular conductor in the No. 1 stator slot is connected to the eighth layer of rectangular conductor in the No. 7 stator slot; the seventh layer of rectangular conductor in the No. 1 stator slot is connected to the fifth layer of rectangular conductor in the No. 43 stator slot; the eighth layer of rectangular conductor in the No. 1 stator slot is connected to the sixth layer of rectangular conductor in the No. 43 stator slot. Other rectangular conductors are connected in the above manner and are not described one by one here.

[0063] At the welding end, the span of the first-layer rectangular conductor in the circumferential direction of the stator core is 2.5, and its end is twisted left and right according to the stator slot; wherein, the ends of the first-layer rectangular conductors in two adjacent stator slots are twisted in opposite directions. That is, the end of the first-layer rectangular conductor in a stator slot is twisted 2.5 slots to the left, and the ends of the first-layer rectangular conductors in the two groups of stator slots adjacent to the stator slot are twisted 2.5 slots to the right; similarly, for the first-layer rectangular conductors in all stator slots, the end of the first-layer rectangular conductor in a stator slot is twisted 2.5 slots to the right, and the ends of the first-layer rectangular conductors in the two groups of stator slots adjacent to the stator slot are twisted 2.5 slots to the left. After twisting, the star point line and the three-phase lead-out terminal are not welded, and the other ends are welded between the two adjacent first-layer rectangular conductors.

[0064] For example, Figure 7 and Figure 8As shown, at the welding end, the end of the first layer of rectangular conductor in the No. 1 stator slot is turned right by 2.5 slot pitches, and its end is located between the outer sides of the No. 3 and No. 4 stator slots; the end of the first layer of rectangular conductor in the No. 2 stator slot is turned left by 2.5 slot pitches, and its end is located between the outer sides of the No. 47 and No. 48 stator slots; the end of the first layer of rectangular conductor in the No. 3 stator slot is turned right by 2.5 slot pitches, and its end is located between the outer sides of the No. 5 and No. 6 stator slots; the end of the first layer of rectangular conductor in the No. 4 stator slot is turned left ...6 stator slots; the end of the first layer of rectangular conductor in the No. 5 stator slot is turned left by 2.5 slot pitches, and its end is located between the outer sides of the No. 6 stator slots; the end of the first layer of rectangular conductor in the No. 4 stator slot is turned left by 2.5 slot pitches, and its end is located between the outer sides of the No. 47 and No. 48 stator slots; the end of the first layer of rectangular conductor in the No. 3 stator slot is turned right by 2.5 slot pitches, and its end is located between the outer sides of the No. 5 and No. 6 stator slots; the end of the first layer of rectangular conductor in the No. 4 stator slot is turned left by 2.5 slot pitches, and its end is located between the outer sides of the No. 6 stator slots; the end of the first layer of rectangular conductor in the No. 4 stator slot is The end of the first layer of rectangular conductor in the No. 5 stator slot is twisted to the right by 2.5 slot pitches, and its end is located between the outer sides of the No. 1 and No. 2 stator slots; the end of the first layer of rectangular conductor in the No. 6 stator slot is twisted to the left by 2.5 slot pitches, and its end is located between the outer sides of the No. 3 and No. 4 stator slots; and so on, all the first layer of rectangular conductors are twisted left and right according to the stator slots, which will not be described in detail here.

[0065] For example, Figure 8 As shown, since the first-layer rectangular conductor in the No. 1 stator slot and the first-layer rectangular conductor in the No. 6 stator slot are not rectangular conductors corresponding to the star point line and the lead-out terminal, and the ends of the first-layer rectangular conductor in the No. 1 stator slot and the first-layer rectangular conductor in the No. 6 stator slot are adjacent after twisting, the ends of the first-layer rectangular conductor in the No. 1 stator slot and the first-layer rectangular conductor in the No. 6 stator slot can be welded. Similarly, after the first-layer rectangular conductors of other stator slots are twisted, except for the rectangular conductors corresponding to the star point line and the lead-out terminal, the two first-layer rectangular conductors with adjacent ends are grouped together and the ends are welded to each other, which will not be described one by one here.

[0066] At the welding end, the span of the 8th layer rectangular conductor in the circumferential direction of the stator core is 3, and its end is twisted left and right according to the stator slot group, wherein the ends of the two 8th layer rectangular conductors in the same stator slot group are twisted in the same direction, and the ends of the 8th layer rectangular conductors in two adjacent stator slot groups are twisted in opposite directions. That is, the ends of the two 8th layer rectangular conductors in one stator slot group are twisted to the left by 3 slots, and the ends of the four 8th layer rectangular conductors in the two stator slot groups adjacent to the stator slot group are twisted to the right by 3 slots; similarly, the ends of the two 8th layer rectangular conductors in one stator slot group are twisted to the right by 3 slots, and the ends of the four 8th layer rectangular conductors in the two stator slot groups adjacent to the stator slot group are twisted to the left by 3 slots. After twisting, the star point line and the three-phase lead-out terminal are not welded, and the other ends are welded between the two adjacent 8th layer rectangular conductors.

[0067] For example, Fig. 9 and Fig.10As shown, at the welding end, the end of the 8th layer of rectangular conductor in the No. 1 stator slot is turned right by 3 slot pitches, and its end is located outside the No. 4 stator slot; the end of the 8th layer of rectangular conductor in the No. 2 stator slot is turned right by 3 slot pitches, and its end is located outside the No. 5 stator slot; the end of the 8th layer of rectangular conductor in the No. 3 stator slot is turned left by 3 slot pitches, and its end is located outside the No. 48 stator slot; the end of the 8th layer of rectangular conductor in the No. 4 stator slot is turned left by 3 slot pitches, and its end is located outside the No. 1 stator slot. The end of the 8th layer of rectangular conductor in the No. 5 stator slot is turned right by 3 slots, and its end is located outside the No. 8 stator slot; the end of the 8th layer of rectangular conductor in the No. 6 stator slot is turned right by 3 slots, and its end is located outside the No. 9 stator slot; the end of the 8th layer of rectangular conductor in the No. 7 stator slot is turned left by 3 slots, and its end is located outside the No. 4 stator slot; the end of the 8th layer of rectangular conductor in the No. 8 stator slot is turned left by 3 slots, and its end is located outside the No. 5 stator slot. By analogy, the end of the 8th layer of rectangular conductor is turned left and right according to the stator slot group, which will not be repeated here.

[0068] For example, Fig.10 As shown, the end of the 8th layer rectangular conductor in the No. 1 stator slot is turned rightward by 3 slot pitches, and its end is located outside the No. 4 stator slot; the end of the 8th layer rectangular conductor in the No. 7 stator slot is turned leftward by 3 slot pitches, and its end is located outside the No. 4 stator slot. The end of the 8th layer rectangular conductor in the No. 1 stator slot is adjacent to the end of the 8th layer rectangular conductor in the No. 7 stator slot, so the end of the 8th layer rectangular conductor in the No. 1 stator slot can be welded to the end of the 8th layer rectangular conductor in the No. 7 stator slot. Similarly, after the 8th layer rectangular conductors in other stator slots are turned, except for the rectangular conductors corresponding to the star point line and the lead-out terminal, the other two rectangular conductors with adjacent ends are grouped together, and the ends are welded to each other, which will not be described one by one here.

[0069] At the welding end, except for the 1st and 8th layers of rectangular conductors, the span of the remaining layers of rectangular conductors in the circumferential direction of the stator core is 3, and their ends are twisted left and right according to the layers; the ends of the rectangular conductors in the same layer are twisted in the same direction, and the ends of the rectangular conductors in adjacent layers are twisted in opposite directions. That is, the ends of the 2nd, 4th and 6th layers of rectangular conductors are twisted to the left, and the ends of the 3rd, 5th and 7th layers of rectangular conductors are twisted to the right; similarly, the ends of the 2nd, 4th and 6th layers of rectangular conductors are twisted to the right, and the ends of the 3rd, 5th and 7th layers of rectangular conductors are twisted to the left. After twisting, two adjacent rectangular conductors in the same layer group are welded.

[0070] For example, Fig. 9 and Fig.10As shown, at the welding end, the ends of the 2nd, 4th and 6th layer rectangular conductors are all twisted to the right by 3 slots, and the ends of the 3rd, 5th and 7th layer rectangular conductors are all twisted to the left by 3 slots.

[0071] For example, Fig.10 As shown, the end of the second layer of rectangular conductor in the No. 1 stator slot is turned rightward by 3 slots, and its end is located outside the No. 4 stator slot; the end of the third layer of rectangular conductor in the No. 7 stator slot is turned leftward by 3 slots, and its end is located outside the No. 4 stator slot. The second layer of rectangular conductor in the No. 1 stator slot and the third layer of rectangular conductor in the No. 7 stator slot belong to the same layer group, and their ends are adjacent, so the ends of the second layer of rectangular conductor in the No. 1 stator slot and the third layer of rectangular conductor in the No. 7 stator slot can be welded. Similarly, the ends of each layer of rectangular conductors are turned left and right according to the layer. After turning, the two rectangular conductors with adjacent ends in the same layer group are welded, which will not be described one by one here.

[0072] According to the above winding method, only four types of connection lines are needed in the stator winding, such as Fig.11 , Fig.12 , Fig.13 and Fig.14 As shown in the figure, there are four types of U-shaped wires in the stator winding. Fig.11 Schematic diagram of the U-shaped line structure corresponding to the first and third layers of rectangular conductors in an embodiment of the present invention; Fig.12 Schematic diagram of the U-shaped line structure corresponding to the second and fourth layers of rectangular conductors in an embodiment of the present invention;

[0073] Fig.13 Schematic diagram of the U-shaped line structure corresponding to the 5th and 7th layers of rectangular conductors in an embodiment of the present invention;

[0074] Fig.14 Schematic diagram of the U-shaped line structure corresponding to the 6th and 8th layers of rectangular conductors in an embodiment of the present invention.

[0075] The winding method of the stator winding proposed in the embodiment of the present invention requires the number of U-shaped wire types to be B / 2, where B is the number of rectangular conductor layers arranged in each stator slot along the radial direction of the stator core. In the stator winding, the U-shaped wire structures corresponding to the same layer of rectangular conductors are the same. The stator winding is designed according to the winding method provided in the embodiment of the present invention, which requires fewer types of U-shaped wires and has a simple structure and is easy to process. The end winding structure is made more compact and the end winding is shorter. In addition, the end winding at the welding end is twisted, which utilizes the space in the radial direction of the stator core, reduces the axial space, and greatly shortens the length of the end winding at the welding end.

[0076] In the embodiment of the present invention, the winding method described above makes the end winding structure compact and the end winding length short, thereby reducing the difficulty of the motor production process, facilitating processing, and favoring mass production.

[0077] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stator assembly for a compact flat wire motor with winding ends, characterized in that: The stator assembly comprises a stator core and a stator winding; The stator core is provided with A stator slots, which are arranged in sequence along the circumferential direction of the stator core in a circular array; each stator slot is provided with B layers of rectangular conductors along the radial direction of the stator core; The stator winding has a span C along the circumference of the stator core at the hairpin end; The stator winding has F layers at the hairpin end along the radial direction of the stator core; The stator winding has a span along the circumference of the stator core at the welding end: the span of the first layer of rectangular conductors in the circumference of the stator core is D; the span of the remaining rectangular conductors except the first layer of rectangular conductors in the circumference of the stator core is E; The stator winding is connected at the welding end in a cross-layer manner along the radial direction of the stator core. The ends of the first layer of rectangular conductors are twisted left and right according to the stator slots, and after twisting, the two first layer rectangular conductors with adjacent ends are welded; the ends of the B layer of rectangular conductors are twisted left and right according to the stator slot groups, and after twisting, the two B layer of rectangular conductors with adjacent ends are welded; the ends of the remaining layers of rectangular conductors are twisted left and right according to the layers, and after twisting, the two rectangular conductors with adjacent ends in the same layer group are welded; Among them, D=(C-1) / 2; E=C / 2; A and B are both even numbers, B≥4, C is a multiple of 3, and A / C is an integer, and F is 2 or 3 or 4.

2. A stator assembly of a compact flat wire motor with winding ends according to claim 1, characterized in that: The stator core is provided with 48 stator slots, and each stator slot can be provided with 8 layers of rectangular conductors.

3. The stator assembly of a compact flat wire motor with winding ends according to claim 2, characterized in that: The span of the stator winding at the hairpin end along the circumferential direction of the stator core is 6; the number of span layers of the stator winding at the hairpin end along the radial direction of the stator core is 2.

4. The stator assembly of a compact flat wire motor with winding ends according to claim 2, characterized in that: The span of the stator winding at the welding end along the circumferential direction of the stator core includes: the span of the first layer of rectangular conductors in the circumferential direction of the stator core is 2.5; the span of the remaining rectangular conductors except the first layer of rectangular conductors in the circumferential direction of the stator core is 3; The stator winding has a cross-layer connection method along the radial direction of the stator core at the welding end, including: the end of the first-layer rectangular conductor is twisted left and right according to the stator slot, and after the twist, the two first-layer rectangular conductors with adjacent ends are welded; the end of the eighth-layer rectangular conductor is twisted left and right according to the stator slot group, and after the twist, the two eighth-layer rectangular conductors with adjacent ends are welded; the end of the remaining layers of rectangular conductors are twisted left and right according to the layer, and after the twist, the two rectangular conductors with adjacent ends in the same layer group are welded.

5. A stator assembly of a compact flat wire motor with winding ends according to claim 1 or 4, characterized in that: The left and right twisting according to the stator slots means that the ends of the first layer of rectangular conductors in two adjacent stator slots are twisted in opposite directions; The left-right twisting according to the stator slot group means that the ends of the two B-th layer rectangular conductors in the same stator slot group are twisted in the same direction, and the ends of the B-th layer rectangular conductors in two adjacent stator slot groups are twisted in opposite directions; The layer-by-layer left and right twisting means that the ends of the rectangular conductors in the same layer are twisted in the same direction, while the ends of the rectangular conductors in adjacent layers are twisted in opposite directions.

6. The stator assembly of a compact flat wire motor with winding ends according to claim 1, characterized in that: The star point line and three-phase lead-out lines of each phase in the stator winding are all led out from the welding end.

7. A compact flat wire motor with winding ends, characterized in that: It comprises a rotor assembly and the stator assembly according to any one of claims 1 to 6, wherein the rotor assembly is located inside the stator assembly.

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