Stator winding and motor

Abstract

The present invention provides a stator winding and a motor. The stator winding includes a stator core and at least two branch windings. The stator core is provided with Z circumferentially distributed stator slots. The stator slots are arranged in order from the first layer to the Nth layer along the radial direction of the stator core, from the inside outward, where N is an even number greater than or equal to 4. Each branch winding includes several coils connected in series in the stator slots, so that each layer of the stator slots has several coils inserted. The coils in the first layer and / or the Nth layer of the stator slots are arranged in an orderly cycle according to a pattern of single full-pitch coils, single short-pitch coils, single full-pitch coils, and single long-pitch coils. The coils in the remaining layers of the stator slots are all combined coils. In this application, the coils in the first layer and / or the Nth layer of the stator slots are arranged in a cyclic structure consisting of a single full-pitch coil, a single short-pitch coil, a single full-pitch coil, and a single long-pitch coil. This effectively balances the inductance and resistance between the branches and prevents the generation of circulating currents between the branches.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicles, automotive permanent magnet synchronous motors are gradually trending towards higher power density and higher speeds. Currently, there are many ways to increase power density, and flat wire motors are one of the most commonly used. As the flat wire stators in flat wire motors increase in voltage and speed, the design of these stators must minimize circulating current and AC copper loss, lowering winding temperature rise. This allows for a smaller motor and improves power density. Multi-layer flat wire motor designs can effectively reduce AC copper loss at high speeds. However, increasing the number of layers and the number of parallel branches leads to different winding configurations. Avoiding circulating current between branches is a key technical issue. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a stator winding that can effectively avoid circulating currents between branches.

[0004] To achieve the above objectives, the present invention provides a stator winding, comprising a stator core and at least two branch windings. The stator core is provided with Z circumferentially distributed stator slots. The stator slots are arranged in a radial direction of the stator core from the inside outward in a first layer to an Nth layer, where N is an even number greater than or equal to 4. Each branch winding comprises a plurality of coils connected in series in the stator slots, such that each layer of the stator slots is provided with a plurality of coils. The coils in the first layer and / or the Nth layer of the stator slots are arranged in an orderly cycle according to a pattern of a single full-pitch coil, a single short-pitch coil, a single full-pitch coil, and a single long-pitch coil. The coils in the remaining layers of the stator slots are all combined coils.

[0005] Furthermore, the single full-spacing coil, the single short-spacing coil and the single long-spacing coil are U-shaped coils;

[0006] The U-shaped coil is an integrated structure, and the two ends of the U-shaped coil of the integrated structure are connected in series in the same layer of the stator slot; or, the U-shaped coil is formed by welding two I-shaped coils; or, the U-shaped coil is a part formed by welding two cross-layer U-shaped coils, and the two ends of the cross-layer U-shaped coil are connected in series in two adjacent layers of the stator slot.

[0007] Furthermore, the pitch of the single full-pitch coil is (Z / 2p), the pitch of the single short-pitch coil is (Z / 2p)-1, and the pitch of the single long-pitch coil is (Z / 2p)+1, where p is the number of pole pairs of the motor.

[0008] Furthermore, the combined coil is a combined concentric coil, which includes a plurality of coils corresponding to each branch winding and having the same central axis.

[0009] Furthermore, there are two branch windings and two combined concentric coils; all intermediate layers of combined concentric coils include a first long-distance coil and a first short-distance coil located on the inner circumference of the first long-distance coil, the pitch of the first long-distance coil is (Z / 2p)+1, the pitch of the first short-distance coil is (Z / 2p)-1, and p is the number of pole pairs of the motor.

[0010] Furthermore, there are two branch windings, and the combined concentric coils have two coils; the several combined concentric coils in each middle layer are the same; the combined concentric coils in a part of the middle layers include a first long-distance coil and a first short-distance coil located on the inner circumference side of the first long-distance coil, the pitch of the first long-distance coil is (Z / 2p)+1, and the pitch of the first short-distance coil is (Z / 2p)-1; the combined concentric coils in the remaining middle layers include a second long-distance coil and a second short-distance coil located on the inner circumference side of the second long-distance coil, the pitch of the second long-distance coil is (Z / 2p), and the pitch of the second short-distance coil is (Z / 2p)-2; p is the number of pole pairs of the motor.

[0011] Furthermore, the combined coil is a combined full-pitch coil, and the combined full-pitch coil includes a plurality of single full-pitch coils corresponding to each branch winding and stacked.

[0012] Furthermore, the input wire and the lead-out wire of each branch winding are distributed in the Nth layer, the N-1th layer, or the N-2th layer of the stator slot.

[0013] The present invention also provides a motor, in which the stator winding as described above is configured.

[0014] As described above, the stator winding and the motor according to the present invention have the following beneficial effects:

[0015] In the present application, the coils in the first layer / or the Nth layer of the stator slots are set to a cyclic structure consisting of a single full-pitch coil, a single short-pitch coil, a single full-pitch coil and a single long-pitch coil, which can effectively balance the inductance and resistance between the branches, make the current distribution of each branch the same, and avoid the generation of circulating current between the branches. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the stator winding in this application.

[0017] Figure 2 Schematic diagram of the structure of the stator slot in this application.

[0018] Figure 3This is a schematic diagram of the expansion of the one-phase winding pitch scheme in this application.

[0019] Figure 4 This is a schematic diagram of the expansion of the short-distance solution for a single-phase winding in this application.

[0020] Figure 5 Figures a, b and c are schematic structural diagrams of a single short-distance coil, a single full-distance coil and a single long-distance coil in this application, respectively.

[0021] Figure 6 This is a schematic diagram of the structure of the combined concentric coils in this application.

[0022] Figure 7 This is a schematic diagram of the structure of the combined full-pitch coil in this application.

[0023] Figure 8 This is a schematic diagram of the I-type coil in this application.

[0024] Figure 9 Schematic diagram of the U-shaped coil in this application.

[0025] Component number description

[0026] 10 stator core

[0027] 11 stator slots

[0028] 20 single full pitch coil

[0029] 30 single short distance coil

[0030] 40 single long distance coil

[0031] 50 combined concentric coils

[0032] 51 First long distance coil

[0033] 52 First short distance coil

[0034] 53 Second long distance coil

[0035] 54 Second short distance coil

[0036] 60 combined full-pitch coils

[0037] 70 I-type coil

[0038] 80 cross-layer U-shaped coil DETAILED DESCRIPTION

[0039] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0040] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0041] The present application provides a stator winding and a motor including the stator winding. The pole pair number p of the motor is 4. The stator winding and the motor including the stator winding are used in new energy vehicles.

[0042] like Figure 1 and Figure 2 As shown, the stator winding involved in this application includes a stator core 10 and at least two branch windings. The stator core 10 is provided with Z circumferentially distributed stator slots 11. The stator slots 11 are arranged from the first layer to the Nth layer in the radial direction of the stator core 10 from the inside to the outside, where N is an even number greater than or equal to 4. Figure 3 and Figure 4 As shown, each branch winding includes several coils connected in series in the stator slots 11, so that several coils are inserted into each layer of the stator slots 11. In this embodiment, Z = 48, i.e., there are 48 stator slots 11; N = 8, i.e., there are eight layers of stator slots 11, with the first layer of stator slots 11 being the innermost layer, the eighth layer of stator slots 11 being the outermost layer, and the second to seventh layers of stator slots 11 being the intermediate layers, that is, distributed between the first and Nth layers.

[0043] The coils in each layer of the stator slot 11 constitute one layer of winding, so there are eight layers of winding in the stator slot 11. The pitches of the coils in the eight layers of winding in the stator slot 11 are different. The coils are defined as short-pitch coils, full-pitch coils, and long-pitch coils according to the pitch size. Figure 5 As shown in Figure a, the pitch is (Z / 2p)-1=5; the full-pitch coil is as follows Figure 5 As shown in Figure b, the pitch is (Z / 2p) = 6; the long distance coil is as follows Figure 5 As shown in Figure c, the pitch is (Z / 2p)+1=7.

[0044] In particular, in this application, Figure 3 or Figure 4As shown, the coils in the first layer and / or the eighth layer of the stator slots 11 are all circulated in an orderly manner according to the rules of a single full-pitch coil 20, a single short-pitch coil 30, a single full-pitch coil 20 and a single long-pitch coil 40. In other words, the several coils of the first layer winding close to the inner periphery of the stator core 10 and the several coils of the eighth layer winding close to the outer periphery of the stator core 10 are all circulated structures with a single full-pitch coil 20, a single short-pitch coil 30, a single full-pitch coil 20 and a single long-pitch coil 40 as a group. Based on this, only the coils in the first layer of the stator slots 11 can be arranged in an orderly cycle according to the pattern of a single full-pitch coil 20, a single short-pitch coil 30, a single full-pitch coil 20, and a single long-pitch coil 40; or only the coils in the eighth layer of the stator slots 11 can be arranged in an orderly cycle according to the pattern of a single full-pitch coil 20, a single short-pitch coil 30, a single full-pitch coil 20, and a single long-pitch coil 40; or the coils in both the first and eighth layers of the stator slots can be arranged in an orderly cycle according to the pattern of a single full-pitch coil 20, a single short-pitch coil 30, a single full-pitch coil 20, and a single long-pitch coil 40. In this embodiment, the coils in both the first and eighth layers of the stator slots are arranged in an orderly cycle according to the pattern of a single full-pitch coil 20, a single short-pitch coil 30, a single full-pitch coil 20, and a single long-pitch coil 40. Here, the single full-pitch coil 20 refers to a single full-pitch coil, and the pitch of the single full-pitch coil 20 is (Z / 2p) = 6; the single short-pitch coil 30 refers to a single short-pitch coil, and the pitch of the single short-pitch coil 30 is (Z / 2p) - 1 = 5; the single long-pitch coil 40 refers to a single long-pitch coil, and the pitch of the single long-pitch coil 40 is (Z / 2p) + 1 = 7. Thus, in the coils of the first and eighth layers of stator slots 11, the number of single full-pitch coils 20 is the sum of the number of single short-pitch coils 30 and single long-pitch coils 40. The coils in the middle layers of stator slots 11 are all combined coils, composed of several coils corresponding to each branch winding.

[0045] In the present application, the coils in the first layer and the Nth layer of the stator slot 11 are arranged into a cyclic structure consisting of a single full-pitch coil 20, a single short-pitch coil 30, a single full-pitch coil 20 and a single long-pitch coil 40. This can effectively balance the inductance and resistance between the branches, make the current distribution of each branch the same, avoid the generation of circulating current between the branches, reduce the temperature rise of the winding, make the motor smaller, and improve the power density of the motor.

[0046] Preferably, the input wire and the lead wire of each branch winding are distributed in the eighth layer, the seventh layer, or the sixth layer of the stator slot 11, that is, arranged close to the outer periphery of the stator core 10, and the closer to the outside, the better, and easier to connect.

[0047] Furthermore, there are two types of combined coils: combined concentric coils 50 and combined full-pitch coils 60. Figure 6 As shown, the combined concentric coil 50 includes several coils corresponding to each branch winding and having the same central axis. Figure 7As shown, the combined full-pitch coil 60 comprises several stacked single full-pitch coils 20 corresponding to the respective branch windings. In this embodiment, there are two branch windings; therefore, the combined concentric coil 50 is composed of two coils with the same central axis; the combined full-pitch coil 60 is composed of two stacked single full-pitch coils 20.

[0048] Furthermore, there are two winding schemes in this application: Figure 3 The one-phase winding pitch scheme shown, and Figure 4 The one-phase winding short-distance scheme is shown, and the coils inserted into the middle layer of the stator slot 11 in the two winding schemes are both combined concentric coils 50. Figure 3 In the single-phase winding pitch scheme shown, the conductors of different layers in the same stator slot 11 are all of the same phase; based on this, the structure of the combined concentric coils 50 of all intermediate layers is the same, including a first long-distance coil 51 and a first short-distance coil 52 located on the inner circumference of the first long-distance coil 51; wherein, the first long-distance coil 51 is the long-distance coil, and the pitch of the first long-distance coil 51 is (Z / 2p)+1=7; the first short-distance coil 52 is the short-distance coil, and the pitch of the first short-distance coil 52 is (Z / 2p)-1=5. Figure 4 In the short-pitch scheme of a single-phase winding shown, conductors in different layers within the same stator slot 11 may be of different phases; based on this, the several combined concentric coils 50 in each intermediate layer are the same; however, the combined concentric coils 50 in a portion of the intermediate layers all include a first long-pitch coil 51 and a first short-pitch coil 52 located on the inner circumference side of the first long-pitch coil 51, the pitch of the first long-pitch coil 51 being (Z / 2p)+1=7, and the pitch of the first short-pitch coil 52 being (Z / 2p)-1=5; and the combined concentric coils 50 in the remaining intermediate layers all include a second long-pitch coil 53 and a second short-pitch coil 54 located on the inner circumference side of the second long-pitch coil 53, the pitch of the second long-pitch coil 53 being (Z / 2p)=6, and the pitch of the second short-pitch coil 54 being (Z / 2p)-2=4, so that the span of the combined concentric coil 50 composed of the second long-pitch coil 53 and the second short-pitch coil 54 is reduced. The following describes a one-phase winding full-pitch solution and a one-phase winding short-pitch solution, and the 48 stator slots 11 are numbered from 1 to 48 in sequence.

[0049] One-phase winding pitch scheme: Figure 3As shown, the top layer is the first layer of the stator slots 11 , and the bottom layer is the eighth layer of the stator slots 11 . One of the branch windings is connected in series in the following order: input from No. 37 on the first layer, span from No. 43 on the second layer to No. 2 on the third layer, span from No. 8 on the fourth layer to No. 13 on the fifth layer, span from No. 19 on the sixth layer to No. 26 on the seventh layer, span from No. 32 on the eighth layer to No. 26 on the eighth layer, span from No. 20 on the seventh layer to No. 13 on the sixth layer, span from No. 7 on the fifth layer to No. 2 on the fourth layer, span from No. 44 on the third layer to No. 37 on the second layer, span from No. 31 on the first layer to No. 26 on the first layer, span from No. 32 on the second layer to No. 37 on the third layer, span from No. 43 on the fourth layer to No. 2 on the fifth layer, span from No. 8 on the sixth layer to No. 13 on the seventh layer, span from No. 19 on the eighth layer to No. 13 on the eighth layer, span from No. 7 on the seventh layer to No. 2 on the sixth layer, span from No. 44 on the fifth layer to No. 37 on the fourth layer, span from No. 31 on the third layer to No. 26 on the second ... The first floor is from span No. 20 to No. 13 on the first floor, the second floor is from span No. 19 to No. 26 on the third floor, the fourth floor is from span No. 32 to No. 37 on the fifth floor, the sixth floor is from span No. 43 to No. 2 on the seventh floor, the eighth floor is from span No. 8 to No. 2 on the eighth floor, the seventh floor is from span No. 44 to No. 37 on the sixth floor, the fifth floor is from span No. 31 to No. 26 on the fourth floor, the third floor is from span No. 20 to No. 13 on the second floor, the first floor is from span No. 7 to No. 2 on the first floor, the second floor is from span No. 8 to No. 13 on the third floor, the fourth floor is from span No. 19 to No. 26 on the fifth floor, the sixth floor is from span No. 32 to No. 37 on the seventh floor, the eighth floor is from span No. 43 to No. 37 on the eighth floor, the seventh floor is from span No. 31 to No. 26 on the sixth floor, the fifth floor is from span No. 20 to No. 13 on the fourth floor, the third floor is from span No. 7 to No. 2 on the second floor, and it leads out from No. 44 on the first floor.

[0050] The other branch winding is connected in series in the following order: input from No. 38 on the first layer, span from No. 44 on the second layer to No. 1 on the third layer, span from No. 7 on the fourth layer to No. 14 on the fifth layer, span from No. 20 on the sixth layer to No. 25 on the seventh layer, span from No. 31 on the eighth layer to No. 38 on the eighth layer, span from No. 32 on the seventh layer to No. 25 on the sixth layer, span from No. 19 on the fifth layer to No. 14 on the fourth layer, span from No. 8 on the third layer to No. 1 on the second layer, span from No. 43 on the first layer to No. 1 on the first layer, span from No. 7 on the second layer to No. 14 on the third layer, span from No. 20 on the fourth layer to No. 25 on the fifth layer, span from No. 31 on the sixth layer to No. 38 on the seventh layer, span from No. 44 on the eighth layer to No. 1 on the eighth layer, span from No. 43 on the seventh layer to No. 38 on the sixth layer, span from No. 32 on the fifth layer to No. 25 on the fourth layer, span from No. 19 on the third layer to No. 14 on the second layer, The first floor is from span No. 8 to No. 14 on the first floor, the second floor is from span No. 20 to No. 25 on the third floor, the fourth floor is from span No. 31 to No. 38 on the fifth floor, the sixth floor is from span No. 44 to No. 1 on the seventh floor, the eighth floor is from span No. 7 to No. 14 on the eighth floor, the seventh floor is from span No. 8 to No. 1 on the sixth floor, the fifth floor is from span No. 43 to No. 38 on the fourth floor, the third floor is from span No. 32 to No. 25 on the second floor, the first floor is from span No. 19 to No. 25 on the first floor, the second floor is from span No. 31 to No. 38 on the third floor, the fourth floor is from span No. 44 to No. 1 on the fifth floor, the sixth floor is from span No. 7 to No. 14 on the seventh floor, the eighth floor is from span No. 20 to No. 25 on the eighth floor, the seventh floor is from span No. 19 to No. 14 on the sixth floor, the fifth floor is from span No. 8 to No. 1 on the fourth floor, the third floor is from span No. 43 to No. 38 on the second floor, and it leads out from No. 32 on the first floor.

[0051] One-phase winding short distance solution: Figure 4As shown, the top layer is the first layer of the stator slots 11 , and the bottom layer is the eighth layer of the stator slots 11 . The windings of one branch are connected in series in the following order: input from No. 37 on the first layer, span from No. 43 on the second layer to No. 2 on the third layer, span from No. 8 on the fourth layer to No. 12 on the fifth layer, span from No. 18 on the sixth layer to No. 25 on the seventh layer, span from No. 31 on the eighth layer to No. 25 on the eighth layer, span from No. 19 on the seventh layer to No. 12 on the sixth layer, span from No. 6 on the fifth layer to No. 2 on the fourth layer, span from No. 44 on the third layer to No. 37 on the second layer, span from No. 31 on the first layer to No. 26 on the first layer, span from No. 32 on the second layer to No. 37 on the third layer, span from No. 43 on the fourth layer to No. 1 on the fifth layer, span from No. 7 on the sixth layer to No. 12 on the seventh layer, span from No. 18 on the eighth layer to No. 12 on the eighth layer, span from No. 6 on the seventh layer to No. 1 on the sixth layer, span from No. 43 on the fifth layer to No. 37 on the fourth layer, span from No. 31 on the third layer to No. 26 on the second layer, span from No. 32 on the second layer to No. 37 on the third layer, span from No. 43 on the fourth layer to No. 1 The first floor is from span No. 20 to No. 13 on the first floor, the second floor is from span No. 19 to No. 26 on the third floor, the fourth floor is from span No. 32 to No. 36 on the fifth floor, the sixth floor is from span No. 42 to No. 1 on the seventh floor, the eighth floor is from span No. 7 to No. 1 on the eighth floor, the seventh floor is from span No. 43 to No. 36 on the sixth floor, the fifth floor is from span No. 30 to No. 26 on the fourth floor, the third floor is from span No. 20 to No. 13 on the second floor, the first floor is from span No. 7 to No. 2 on the first floor, the second floor is from span No. 8 to No. 13 on the third floor, the fourth floor is from span No. 19 to No. 25 on the fifth floor, the sixth floor is from span No. 31 to No. 36 on the seventh floor, the eighth floor is from span No. 42 to No. 36 on the eighth floor, the seventh floor is from span No. 30 to No. 25 on the sixth floor, the fifth floor is from span No. 19 to No. 13 on the fourth floor, the third floor is from span No. 7 to No. 2 on the second floor, and it leads out from No. 44 on the first floor.

[0052] The other branch winding is connected in series in the following order: input from No. 38 on the first layer, span from No. 44 on the second layer to No. 1 on the third layer, span from No. 7 on the fourth layer to No. 13 on the fifth layer, span from No. 19 on the sixth layer to No. 24 on the seventh layer, span from No. 30 on the eighth layer to No. 37 on the eighth layer, span from No. 31 on the seventh layer to No. 24 on the sixth layer, span from No. 18 on the fifth layer to No. 14 on the fourth layer, span from No. 8 on the third layer to No. 1 on the second layer, span from No. 43 on the first layer to No. 1 on the first layer, span from No. 7 on the second layer to No. 14 on the third layer, span from No. 20 on the fourth layer to No. 24 on the fifth layer, span from No. 30 on the sixth layer to No. 37 on the seventh layer, span from No. 43 on the eighth layer to No. 48 on the eighth layer, span from No. 42 on the seventh layer to No. 37 on the sixth layer, span from No. 31 on the fifth layer to No. 25 on the fourth layer, span from No. 19 on the third layer to No. 14 on the second layer, The first floor is from span No. 8 to No. 14 on the first floor, the second floor is from span No. 20 to No. 25 on the third floor, the fourth floor is from span No. 31 to No. 37 on the fifth floor, the sixth floor is from span No. 43 to No. 48 on the seventh floor, the eighth floor is from span No. 6 to No. 13 on the eighth floor, the seventh floor is from span No. 7 to No. 48 on the sixth floor, the fifth floor is from span No. 42 to No. 38 on the fourth floor, the third floor is from span No. 32 to No. 25 on the second floor, the first floor is from span No. 19 to No. 25 on the first floor, the second floor is from span No. 31 to No. 38 on the third floor, the fourth floor is from span No. 44 to No. 48 on the fifth floor, the sixth floor is from span No. 6 to No. 13 on the seventh floor, the eighth floor is from span No. 19 to No. 24 on the eighth floor, the seventh floor is from span No. 18 to No. 13 on the sixth floor, the fifth floor is from span No. 7 to No. 1 on the fourth floor, the third floor is from span No. 43 to No. 38 on the second floor, and it leads out from No. 32 on the first floor.

[0053] Figure 3 and Figure 4 In the illustrated embodiment, No. 37 and No. 38 on the first layer are input interfaces; of course, in other embodiments, any two adjacent interfaces on the first layer may be selected as input interfaces.

[0054] Furthermore, the single full-pitch coils 20, single short-pitch coils 30, and single long-pitch coils 40 in the first and Nth layers of the stator slots 11 are all U-shaped coils. Of course, the first long-pitch coils 51, first short-pitch coils 52, second long-pitch coils 53, and second short-pitch coils 54 that constitute the combined concentric coils 50 in the middle layer of the stator slots 11, as well as the single full-pitch coils 20 that constitute the combined full-pitch coils 60, are also U-shaped coils. In this application, there are three structural forms of U-shaped coils:

[0055] 1. The U-shaped coil is an integrated structure, and both ends of the U-shaped coil of the integrated structure are connected in series in the same layer of the stator slot 11 .

[0056] 2. If Figure 7As shown, the U-shaped coil is formed by welding two I-shaped coils 40, and both ends of each I-shaped coil 40 are welding ends. By welding the ends of the two I-shaped coils 40, single long-distance coils and single short-distance coils 20 of the first and eighth layers, or coils of the middle layer can be formed.

[0057] 3. Figure 8 As shown, the U-shaped coil is a portion formed by welding two cross-layer U-shaped coils 50. Both ends of the cross-layer U-shaped coil 50 are welded ends. The ends of the cross-layer U-shaped coil 50 are connected in series between two adjacent layers of the stator slot 11. The cross-layer U-shaped coil 50 forming the first layer of U-shaped coils is connected in series between the first and second layers of the stator slot 11, and the cross-layer U-shaped coil 50 forming the eighth layer of U-shaped coils is connected in series between the eighth and seventh layers of the stator slot 11. In addition, the number of U-shaped coils can be reduced, thereby reducing process manufacturing costs.

[0058] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0059] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A stator winding, comprising a stator core (10) and at least two branch windings, wherein the stator core (10) is provided with Z circumferentially distributed stator slots (11), wherein the stator slots (11) are sequentially arranged from the first layer to the Nth layer along the radial direction of the stator core (10) from the inside to the outside, where N is an even number greater than or equal to 4, and each branch winding comprises a plurality of coils connected in series in the stator slots (11), so that a plurality of coils are inserted in each layer of the stator slots (11), characterized in that: The coils in the first layer and / or the Nth layer of the stator slot (11) are all arranged in a regular cycle according to the rules of a single full-pitch coil (20), a single short-pitch coil (30), a single full-pitch coil (20) and a single long-pitch coil (40), and the coils in the remaining layers of the stator slot (11) are all combined coils; the combined coils are combined concentric coils (50), and the combined concentric coils (50) include a plurality of coils corresponding to each branch winding and having the same central axis, the branch winding has two, and the combined concentric coils (50) have two coils; the plurality of combined concentric coils (50) in each middle layer are the same; the combined concentric coils (50) in a part of the middle layer are the same. ) include a first long-distance coil (51) and a first short-distance coil (52) located on the inner circumference side of the first long-distance coil (51), the pitch of the first long-distance coil (51) is (Z / 2p)+1, and the pitch of the first short-distance coil (52) is (Z / 2p)-1; the combined concentric coils (50) of the remaining intermediate layers include a second long-distance coil (53) and a second short-distance coil (54) located on the inner circumference side of the second long-distance coil (53), the pitch of the second long-distance coil (53) is (Z / 2p), and the pitch of the second short-distance coil (54) is (Z / 2p)-2; p is the number of pole pairs of the motor.

2. The stator winding according to claim 1, characterized in that: The single full-distance coil (20), the single short-distance coil (30), and the single long-distance coil (40) are U-shaped coils; The U-shaped coil is an integrated structure, and the two ends of the U-shaped coil of the integrated structure are connected in series in the same layer of the stator slot (11); or, the U-shaped coil is formed by welding two I-shaped coils (40); or, the U-shaped coil is a part formed by welding two cross-layer U-shaped coils (50), and the two ends of the cross-layer U-shaped coil (50) are connected in series in two adjacent layers of the stator slot (11).

3. The stator winding according to claim 1, characterized in that: The pitch of the single full-pitch coil (20) is (Z / 2p), the pitch of the single short-pitch coil (30) is (Z / 2p)-1, and the pitch of the single long-pitch coil (40) is (Z / 2p)+1, where p is the number of pole pairs of the motor.

4. The stator winding according to claim 1, characterized in that: The combined coil is a combined full-pitch coil (60), and the combined full-pitch coil (60) comprises a plurality of single full-pitch coils (20) corresponding to each branch winding and stacked.

5. The stator winding according to claim 1, characterized in that: The input wire and the lead-out wire of each branch winding are distributed in the Nth layer, the N-1th layer, or the N-2th layer of the stator slot (11).

6. A motor, characterized in that: The motor is provided with the stator winding according to any one of claims 1 to 5.

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