Multi-tooth continuously-wound multi-winding stator assembly and motor

Abstract

The utility model relates to the technical field of flat wire motors, in particular to a multi-tooth continuous winding multi-winding stator assembly and a motor. The stator winding is a three-phase winding, each phase winding comprises one or Y branches, and Y is an integral multiple of 2; each branch is formed by connecting a plurality of winding units in series; each continuous winding unit comprises a plurality of minimum units which are distributed on a plurality of continuously adjacent stator teeth; each minimum unit comprises a stator tooth and a plurality of coil layers, and the plurality of coil layers are wound on the same stator tooth layer by layer. In the utility model, each continuous winding unit comprises a plurality of continuously adjacent minimum units, and the plurality of minimum units in the same continuous winding unit can be directly and continuously wound without welding. The size of the end part of the stator winding is further reduced by reducing the number of welding points.

Description

Technical Field

[0001] The utility model belongs to the technical field of flat wire motors, and particularly relates to a multi-tooth connected winding stator component and a motor. Background Art

[0002] The power density requirements of domestic new energy vehicle drive motors are getting higher and higher, but the number of parallel branches of mainstream motors is relatively small and cannot meet the demand for high power density. Therefore, the motor solution with multiple parallel branches has become a key research direction in the industry.

[0003] In addition, the existing flat wire motor solutions are mainly divided into two types: distributed winding and centralized winding. The stator winding using distributed winding has higher end heights on both sides, which increases the size of the motor. This affects the overall performance of the motor and increases the difficulty of the motor production process. The stator winding using centralized winding has a lower end height and smaller size than the distributed winding.

[0004] However, there are currently few concentrated winding solutions available, and the end size reduction of existing concentrated windings is limited. Utility Model Content

[0005] In view of the above problems, the utility model provides a multi-tooth winding stator assembly, the stator assembly comprising a stator core and a stator winding; the stator core is provided with a plurality of stator teeth along its circumferential direction; a stator slot is formed between any two adjacent stator teeth, the stator winding comprises an in-slot conductor, and the in-slot conductor is arranged in the stator slot; along the radial direction of the stator core, X layers of in-slot conductors are arranged in the stator slot, wherein X is an integer;

[0006] The stator winding is a three-phase winding, each phase winding includes 1 or Y branches, Y is an integer multiple of 2; each branch is composed of a number of winding units connected in series;

[0007] Each of the continuous winding units includes a plurality of minimum units distributed on a plurality of consecutively adjacent stator teeth; each minimum unit includes a stator tooth and a plurality of coil layers, and the plurality of coil layers are wound layer by layer on the same stator tooth.

[0008] Furthermore, each coil layer is formed by winding in a concentrated winding manner layer by layer along the radial direction of the stator core.

[0009] Furthermore, along the radial direction of the stator core, the winding directions of any two adjacent coil layers in the same minimum unit are opposite; in any two adjacent coil layers, the wires in the end slots of the inner coil layer and the wires in the starting slots of the outer coil layer are respectively located in two stator slots on both sides of the stator teeth of the minimum unit, and are connected in series with each other.

[0010] Furthermore, for any two adjacent minimum units in the same winding unit, the conductor in the end slot of the outermost coil layer of one minimum unit and the conductor in the start slot of the innermost coil layer of another minimum unit are respectively located in two adjacent stator slots and are connected in series.

[0011] Furthermore, the conductors in the end slots and the conductors in the start slots of each of the minimum units are located in the innermost layer or the outermost layer of the stator slots.

[0012] Furthermore, each of the continuous winding units includes 4 minimum units, which are distributed on 4 consecutive adjacent stator teeth;

[0013] Each minimum unit includes a stator tooth, an inner coil layer and an outer coil layer, the inner coil layer is wound on the stator tooth, and the outer coil layer is wound on the inner coil layer.

[0014] Furthermore, the conductors in the end slots and the conductors in the start slots of each of the minimum units are simultaneously located in the innermost layer of the stator slots.

[0015] Furthermore, the stator core is provided with 48 stator teeth along its circumferential direction; along the radial direction of the stator core, 7 layers of in-slot conductors are arranged in the stator slots; the number of branches of each phase of the winding is 2; and each branch is composed of two winding units connected in series.

[0016] The utility model also provides a multi-tooth winding motor, wherein the motor comprises any of the above-mentioned stator assemblies.

[0017] The beneficial effects of the utility model are:

[0018] 1. The stator winding in the utility model adopts a concentrated winding method, which greatly reduces the space size of the stator winding end compared with the existing non-concentrated winding method.

[0019] 2. In the present invention, each continuous winding unit includes a plurality of continuous adjacent minimum units, and a plurality of minimum units in the same continuous winding unit can be directly and continuously wound without welding. The reduction in the number of welding points further reduces the size of the stator winding end.

[0020] 3. Each minimum unit is wound continuously, making the conductor arrangement in the slot more compact, effectively reducing the size of the stator slot, reducing the overall size of the stator assembly, and increasing the power density and torque density of the motor.

[0021] 4. In the present invention, each branch of the stator winding contains the same number of minimum units, the same number of wires in the slots, and the same winding path pattern for each branch, so that the stator winding is in a balanced state.

[0022] 5. The utility model provides a new centralized winding solution, which enriches the optional solutions for flat wire motors.

[0023] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the motor structure of an embodiment of the utility model is shown;

[0026] Figure 2 A schematic diagram of the local structure of the stator winding of an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example 1

[0029] This embodiment provides a multi-tooth winding motor, such as Figure 1 As shown, the motor includes a stator assembly. The stator assembly includes a stator core and a stator winding. The stator core is provided with a plurality of stator teeth along its circumferential direction; a stator slot is formed between any two adjacent stator teeth, and the stator winding includes an in-slot conductor, which is arranged in the stator slot; along the radial direction of the stator core, X layers of in-slot conductors are arranged in the stator slot, where X is an integer.

[0030] The stator winding is a three-phase winding, each phase winding includes 1 or Y branches, Y is an integer multiple of 2; each branch is composed of a plurality of winding units connected in series.

[0031] Specifically, each continuous winding unit includes a plurality of minimum units distributed on a plurality of consecutively adjacent stator teeth. Each minimum unit includes a stator tooth and a plurality of coil layers, and the plurality of coil layers are wound on the stator teeth layer by layer.

[0032] Each coil layer adopts a concentrated winding method and is wound layer by layer along the radial direction of the stator core. Each coil layer is a spiral structure wound around the stator teeth.

[0033] Furthermore, along the radial direction of the stator core, the winding directions of any two adjacent coil layers in the same minimum unit are opposite; in any two adjacent coil layers, the wire in the end slot of the inner coil layer and the wire in the starting slot of the outer coil layer are respectively located in two stator slots on both sides of the stator teeth of the minimum unit, and are connected in series with each other.

[0034] For any two adjacent minimum units in the same winding unit, the conductor in the end slot of the outermost coil layer of one minimum unit and the conductor in the beginning slot of the innermost coil layer of another minimum unit are respectively located in two adjacent stator slots and are connected in series.

[0035] It should be noted that the conductors in the end slots and the conductors in the start slots of each minimum unit are located in the innermost layer or the outermost layer of the stator slots.

[0036] The stator winding in this embodiment adopts a concentrated winding method, which greatly reduces the space size of the stator winding end compared to the existing non-concentrated winding method. In addition, each continuous winding unit in the utility model includes multiple continuous adjacent minimum units, and multiple minimum units in the same continuous winding unit can be directly wound continuously without welding. The reduction in the number of welding points further reduces the size of the stator winding end; and continuous winding makes the wire arrangement in the slot more compact, the stator slot size is effectively reduced, the overall size of the stator assembly is reduced, and the power density and torque density of the motor are increased.

[0037] Example 2

[0038] This embodiment provides a multi-tooth winding motor, such as Figure 1 As shown, the motor includes a stator assembly. The stator assembly includes a stator core and a stator winding. The stator core is provided with a plurality of stator teeth along its circumferential direction; a stator slot is formed between any two adjacent stator teeth, and the stator winding includes an in-slot conductor, which is arranged in the stator slot; along the radial direction of the stator core, X layers of in-slot conductors are arranged in the stator slot, where X is an integer.

[0039] The stator winding is a three-phase winding, each phase winding includes 1 or Y branches, Y is an integer multiple of 2; each branch is composed of a plurality of winding units connected in series.

[0040] Each continuous winding unit includes 4 minimum units, which are distributed on 4 consecutive adjacent stator teeth. Each minimum unit includes a stator tooth, an inner coil layer and an outer coil layer, the inner coil layer is wound on the stator tooth, and the outer coil layer is wound on the inner coil layer.

[0041] The inner coil layer and the outer coil layer are both formed by concentrated winding, and are wound layer by layer along the radial direction of the stator core. The inner coil layer and the outer coil layer are both spiral structures wound around the stator teeth.

[0042] Furthermore, along the radial direction of the stator core, the winding directions of the inner coil layer and the outer coil layer in the same minimum unit are opposite; the conductor in the end slot of the inner coil layer and the conductor in the starting slot of the outer coil layer in the same minimum unit are respectively located in two stator slots on both sides of the stator teeth of the minimum unit, and are connected in series with each other.

[0043] For any two adjacent minimum units in the same winding unit, the conductor in the end slot of the outer coil layer of one minimum unit and the conductor in the start slot of the inner coil layer of another minimum unit are respectively located in two adjacent stator slots and are connected in series.

[0044] It should be noted that the conductors in the end slots and the conductors in the start slots of each minimum unit are simultaneously located in the innermost layer or the outermost layer in the stator slots. That is, the conductors in the end slots and the conductors in the start slots of each minimum unit can be simultaneously arranged in a layer in the stator slots that is closest to the inner circle of the stator core, or can be simultaneously arranged in a layer in the stator slots that is closest to the outer circle of the stator core.

[0045] Preferably, the conductors in the end slots and the conductors in the start slots of each minimum unit are simultaneously located in the innermost layer of the stator slots.

[0046] The wires in the start and end slots of the smallest unit are all arranged in the innermost layer of the stator slots. When multiple smallest units in the same branch are connected in series, the required series winding length is the shortest, which is convenient for controlling the overall size of the motor.

[0047] In this embodiment, each continuous winding unit includes 4 consecutive adjacent minimum units, and the 4 minimum units in the same continuous winding unit can be directly wound continuously. In the multi-tooth continuous winding scheme, the four-tooth continuous winding scheme not only reduces the overall size of the stator assembly, but also has the best process effect. In addition, each minimum unit includes two layers of coil layers. Compared with the one-layer coil layer scheme, while ensuring consistent performance, the winding bending radius is reduced and the motor process is reduced; compared with the three-layer or more coil layer scheme, the slot fill rate and copper usage are increased.

[0048] Example 3

[0049] This embodiment provides a multi-tooth winding motor, such as Figure 1As shown, the motor includes a stator assembly. The stator assembly includes a stator core and a stator winding. The stator core is provided with 48 stator teeth along its circumferential direction; a stator slot is formed between any two adjacent stator teeth, and the stator winding includes an in-slot conductor, which is arranged in the stator slot; along the radial direction of the stator core, 7 layers of in-slot conductors are arranged in the stator slot.

[0050] The stator winding is a three-phase winding, and the number of branches of each phase winding is 2. Each continuous winding unit includes 4 minimum units, that is, a continuous winding unit includes four consecutive adjacent stator teeth and windings wound on the stator teeth.

[0051] like Figure 2 As shown, along the circumferential direction of the stator core, four rows of slot conductors are arranged in each stator slot. Among them, in the stator slots on both sides of each stator tooth, the two rows of slot conductors closest to the stator teeth belong to the inner coil layer, and the two rows of slot conductors outside the inner coil layer belong to the outer coil layer.

[0052] For the convenience of description, each stator tooth is named along the circumference of the stator core, and is recorded as the 1st stator tooth, the 2nd stator tooth, ..., the Zth stator tooth; Z is the number of stator teeth on the stator core. Figure 2 As shown in the figure, the conductors in the two rows of slots on both sides of the stator teeth in each minimum unit are named respectively: the conductors in the first row of slots on the left side of the stator teeth are named No. 1 conductor, No. 2 conductor, No. 3 conductor, ..., No. 7 conductor from the center of the stator core to the outer circle of the stator core; the conductors in the first row of slots on the right side of the stator teeth are named No. 8 conductor, No. 9 conductor, No. 10 conductor, ..., No. 14 conductor from the center of the stator core to the outer circle of the stator core; the conductors in the second row of slots on the left side of the stator teeth are named No. a conductor, No. b conductor, No. c conductor, ..., No. g conductor from the center of the stator core to the outer circle of the stator core; the conductors in the second row of slots on the right side of the stator teeth are named No. h conductor, No. i conductor, No. j conductor, ..., No. n conductor from the center of the stator core to the outer circle of the stator core. For example, tooth 3 (5) represents the No. 5 conductor in the first row on the left side of the third stator tooth; tooth 8 (j) represents the No. j conductor in the second row on the right side of the eighth stator tooth.

[0053] For example, the specific winding path of a continuous winding unit is: tooth 1 (8) → tooth 1 (1) → tooth 1 (9) → tooth 1 (2) → tooth 1 (10) → tooth 1 (3) → tooth 1 (11) → tooth 1 (4) → tooth 1 (12) → tooth 1 (5) → tooth 1 (13) → tooth 1 (6) → tooth 1 (14) → tooth 1 (7) → tooth 1 (n) → tooth 1 (g) → tooth 1 (m) → tooth 1 (f) → tooth 1 (l) → tooth 1 (e) → tooth 1 (k) → tooth 1 (d) → tooth 1 (j) → tooth 1 (c) → tooth 1 (i) → tooth 1 ( b) → Tooth 1 (h) → Tooth 1 (a) → Tooth 2 (1) → Tooth 2 (8) → Tooth 2 (2) → Tooth 2 (9) → Tooth 2 (3) → Tooth 2 (10) → Tooth 2 (4) → Tooth 2 (11) → Tooth 2 (5) → Tooth 2 (12) → Tooth 2 (6) → Tooth 2 (13) → Tooth 2 (7) → Tooth 2 (14) → Tooth 2 (g) → Tooth 2 (n) → Tooth 2 (f) → Tooth 2 (m) → Tooth 2 (e) → Tooth 2 (l) → Tooth 2 (d) → Tooth 2 (k) → Tooth 2 (c) → Tooth 2 (j) → Tooth 2 (b) → Tooth 2 (i) → Tooth 2 (a) → tooth 2 (h) → tooth 3 (8) → tooth 3 (1) → tooth 3 (9) → tooth 3 (2) → tooth 3 (10) → tooth 3 (3) → tooth 3 (11) → tooth 3 (4) → tooth 3 (12) → tooth 3 (5) → tooth 3 (13) → tooth 3 (6) → tooth 3 (14) → tooth 3 (7) → tooth 3 (n) → tooth 3 (g) → tooth 3 (m) → tooth 3 (f) → tooth 3 (l) → tooth 3 (e) → tooth 3 (k) → tooth 3 (d) → tooth 3 (j) → tooth 3 (c) → tooth 3 (i) → tooth 3 (b) → tooth 3 (h) → tooth 3(a)→tooth 4(1)→tooth 4(8)→tooth 4(2)→tooth 4(9)→tooth 4(3)→tooth 4(10)→tooth 4(4)→tooth 4(11)→tooth 4(5)→tooth 4(12)→tooth 4(6)→tooth 4(13)→tooth 4(7)→tooth 4(14)→tooth 4(g)→tooth 4(n)→tooth 4(f)→tooth 4(m)→tooth 4(e)→tooth 4(l)→tooth 4(d)→tooth 4(k)→tooth 4(c)→tooth 4(j)→tooth 4(b)→tooth 4(i)→tooth 4(a)→tooth 4(h).

[0054] Among them, the winding path of the smallest unit where the first stator tooth is located is: tooth 1 (8) → tooth 1 (1) → tooth 1 (9) → tooth 1 (2) → tooth 1 (10) → tooth 1 (3) → tooth 1 (11) → tooth 1 (4) → tooth 1 (12) → tooth 1 (5) → tooth 1 (13) → tooth 1 (6) → tooth 1 (14) → tooth 1 (7) → tooth 1 (n) → tooth 1 (g) → tooth 1 (m) → tooth 1 (f) → tooth 1 (l) → tooth 1 (e) → tooth 1 (k) → tooth 1 (d) → tooth 1 (j) → tooth 1 (c) → tooth 1 (i) → tooth 1 (b) → tooth 1 (h) → tooth 1 (a).

[0055] The winding path of the inner coil layer of the smallest unit where the first stator tooth is located is: tooth 1 (8) → tooth 1 (1) → tooth 1 (9) → tooth 1 (2) → tooth 1 (10) → tooth 1 (3) → tooth 1 (11) → tooth 1 (4) → tooth 1 (12) → tooth 1 (5) → tooth 1 (13) → tooth 1 (6) → tooth 1 (14) → tooth 1 (7); the winding path of the outer coil layer of the smallest unit where the first stator tooth is located is: tooth 1 (n) → tooth 1 (g) → tooth 1 (m) → tooth 1 (f) → tooth 1 (l) → tooth 1 (e) → tooth 1 (k) → tooth 1 (d) → tooth 1 (j) → tooth 1 (c) → tooth 1 (i) → tooth 1 (b) → tooth 1 (h) → tooth 1 (a).

[0056] In the smallest unit where the first stator tooth is located, the conductor tooth 1 (7) in the end slot of the inner coil layer and the conductor tooth 1 (n) in the start slot of the outer coil layer are respectively located in two stator slots on both sides of the first stator tooth and are connected in series.

[0057] The conductor 1(a) in the end slot of the outer coil layer of the smallest unit where the first stator tooth is located and the conductor tooth 2(1) in the start slot of the inner coil layer of the smallest unit where the second stator tooth is located are respectively located in two stator slots on both sides of the first stator tooth and are connected in series.

[0058] In the above example, one continuous winding unit includes four minimum units, that is, four teeth can be wound continuously during motor production. Compared with the single-tooth winding of the existing centralized winding, the number of welding points is reduced, and the size of the stator winding end is further reduced.

[0059] Furthermore, each branch is composed of two winding units connected in series. The branch lead wires of each phase winding can be set at any connection of the winding. The winding arrangement rules of the three-phase winding are the same, and they are evenly and symmetrically distributed on the stator core, and no further examples are given here.

[0060] Each branch of the stator winding contains the same number of minimum units, the same number of wires in the slots, and the same winding path pattern of each branch, so that the stator winding is in a balanced state.

[0061] 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 replacements for some of the technical features therein; and these modifications or replacements 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 multi-tooth winding stator assembly, characterized in that: The stator assembly comprises a stator core and a stator winding; the stator core is provided with a plurality of stator teeth along its circumferential direction; a stator slot is formed between any two adjacent stator teeth, the stator winding comprises an in-slot conductor, and the in-slot conductor is arranged in the stator slot; along the radial direction of the stator core, the stator slot is arranged with X layers of in-slot conductors, where X is an integer; The stator winding is a three-phase winding, each phase winding includes 1 or Y branches, Y is an integer multiple of 2; each branch is composed of a number of winding units connected in series; Each of the continuous winding units includes a plurality of minimum units distributed on a plurality of consecutively adjacent stator teeth; each minimum unit includes a stator tooth and a plurality of coil layers, and the plurality of coil layers are wound layer by layer on the same stator tooth.

2. A multi-tooth winding stator assembly according to claim 1, characterized in that: Each coil layer adopts a concentrated winding method and is wound layer by layer along the radial direction of the stator core.

3. The multi-tooth winding stator assembly according to claim 1, characterized in that: Along the radial direction of the stator core, the winding directions of any two adjacent coil layers in the same minimum unit are opposite; in any two adjacent coil layers, the conductor in the end slot of the inner coil layer and the conductor in the start slot of the outer coil layer are respectively located in two stator slots on both sides of the stator teeth of the minimum unit, and are connected in series with each other.

4. The multi-tooth winding stator assembly according to claim 3, characterized in that: For any two adjacent minimum units in the same winding unit, the conductor in the end slot of the outermost coil layer of one minimum unit and the conductor in the start slot of the innermost coil layer of another minimum unit are respectively located in two adjacent stator slots and are connected in series.

5. The multi-tooth winding stator assembly according to claim 4, characterized in that: The conductors in the end slots and the conductors in the start slots of each of the minimum units are located in the innermost layer or the outermost layer of the stator slots.

6. The multi-tooth winding stator assembly according to claim 1, characterized in that: Each of the continuous winding units includes 4 minimum units distributed on 4 consecutive adjacent stator teeth; Each minimum unit includes a stator tooth, an inner coil layer and an outer coil layer, the inner coil layer is wound on the stator tooth, and the outer coil layer is wound on the inner coil layer.

7. A multi-tooth winding stator assembly according to claim 6, characterized in that: The conductors in the end slots and the conductors in the start slots of each of the minimum units are simultaneously located in the innermost layer of the stator slots.

8. The multi-tooth winding stator assembly according to claim 7, characterized in that: The stator core is provided with 48 stator teeth along its circumferential direction; along the radial direction of the stator core, 7 layers of in-slot conductors are arranged in the stator slots; the number of branches of each phase of the winding is 2; each branch is composed of two winding units connected in series.

9. A multi-tooth winding motor, characterized in that: The electric motor comprises the stator assembly according to any one of claims 1-8.

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