Flat wire phase winding and stator structure

Abstract

The utility model discloses a flat wire phase winding and stator structure, wherein, each phase winding includes at least two groups of concentrically arranged coil groups, the branch of each group of coil groups is located on the adjacent two layers of phase winding, and each includes at least two pairs of coils arranged in sequence on the circumferentially adjacent slot position, the pair of coils includes the first coil ring and the second coil ring of the magnetic pole position setting in the circumferential misplacement, the first coil ring and the second coil ring all include p 1 U-shaped conductors in sequence in the circumferential connection, the pitch of the U-shaped conductor is Y, and there is a magnetic pole position between the two U-shaped conductors of mutual connection in sequence, and p is the pole pair number, the utility model has the advantages of reasonable structure, reduces or does not increase the special jumper release card situation, realizes product serialization only by increasing standard release card and the cross connection release card of same type, shortens the development cycle etc.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a flat wire phase winding and stator structure. Background Technology

[0002] With the surge in demands for torque and power density in new energy vehicle drive motors, drive motors are increasingly adopting flat wire windings. Using flat wire in the stator windings significantly increases slot fill factor and improves heat dissipation within the slots. Flat wire phase windings typically employ wave windings, allowing for different pitches to meet requirements for winding arrangement and insulation. Common flat wire stator winding structures include Hairpin, I-pin, and continuous wave windings, with the first two being the most mature. The number of flat wire layers in stator windings varies depending on the complexity of the manufacturing process, ranging from 2 to 12 layers. Existing multi-layer flat wire phase windings often require at least one two-legged jumper to bridge three or more layers or use long and short pitch jumpers to create inter-layer and inter-group jumpers, increasing the variety of jumpers. For windings with different layer counts, jumpers need to be redesigned, resulting in long development cycles and hindering standardization. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is: how to provide a flat wire phase winding and stator structure with reasonable structure, which can achieve product serialization and shorten the R&D cycle by only adding standard hairpins and similar jumper hairpins without reducing or increasing the number of special jumper hairpins.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A flat wire phase winding, each phase winding includes at least two sets of concentrically arranged coil groups, the legs of each set of coil groups are located on two adjacent layers of the phase winding, and each set includes at least two pairs of coils arranged sequentially in adjacent circumferential slots. The pairs of coils include a first coil ring and a second coil ring arranged circumferentially offset by one magnetic pole position. The first coil ring and the second coil ring each include p-1 U-shaped conductors connected in series in the circumferential direction. The pitch of the U-shaped conductors is Y, and the two U-shaped conductors connected in series are separated by one magnetic pole position, where p is the number of magnetic pole pairs.

[0006] In the two pairs of coils at corresponding positions on two adjacent groups of coils, a first bridging hairpin is connected in series between the two first coil loops, and a second bridging hairpin is connected in series between the two second coil loops. The two legs of the first bridging hairpin and the two legs of the second bridging hairpin are distributed in the adjacent Nth layer and N+1th layer, where N is an even number.

[0007] In the paired coils located on the innermost or outermost coil group, a reverse conductor is connected in series between the first coil loop and the second coil loop.

[0008] Furthermore, two pairs of coils are sequentially arranged in circumferentially adjacent slots, namely a first position paired coil and a second position paired coil; between two adjacent groups of coils, the sum of the pitches of the first bridging hairpins connected in series between the first coil loops on the two first position paired coils and the first bridging hairpins connected in series between the first coil loops on the two second position paired coils is 2Y; the sum of the pitches of the second bridging hairpins connected in series between the second coil loops on the two first position paired coils and the second bridging hairpins connected in series between the second coil loops on the two second position paired coils is 2Y.

[0009] Furthermore, the sum of the pitches of the reverse conductor connected in series between the first and second coil loops in the first position paired coil and the reverse conductor connected in series between the first and second coil loops in the second position paired coil is 2K, where K is the pole pitch.

[0010] Furthermore, between the two first-position paired coils on two adjacent sets of coil groups, the pitch of the first bridging hairpin connected in series between the first coil rings is equal to the pitch of the second bridging hairpin connected in series between the second coil rings; the pitch of the reverse conductor connected in series between the first coil ring and the second coil ring in the first-position paired coils located in the innermost or outermost layer is K, where K is the pole pitch.

[0011] Between two second-position paired coils on two adjacent sets of coil groups, the pitch of the first bridging hairpin connected in series between the first coil rings is equal to the pitch of the second bridging hairpin connected in series between the second coil rings; the pitch of the reverse conductor connected in series between the first coil ring and the second coil ring in the second-position paired coils located in the innermost or outermost layer is K, where K is the pole pitch.

[0012] Furthermore, between the two pairs of coils at the first position on two adjacent sets of coil groups, the sum of the pitches of the first bridging hairpin connected in series between the first coil loops and the second bridging hairpin connected in series between the second coil loops is 2Y; between the two pairs of coils at the second position on two adjacent sets of coil groups, the sum of the pitches of the first bridging hairpin connected in series between the first coil loops and the second bridging hairpin connected in series between the second coil loops is 2Y; the pitches of the two reverse conductors are K+1 and K-1, respectively.

[0013] Furthermore, the reverse conductor includes two first S-shaped conductors with the same twisting direction and both located in the innermost or outermost layer. The first S-shaped conductor includes a slot interior for passing through the stator core slot, and a welding end and a plug end twisted in opposite directions at both ends of the slot interior. A bridging conductor is connected in series between the plug ends of the two first S-shaped conductors.

[0014] Furthermore, the reverse conductor is a U-shaped conductor with both legs located in the outermost or innermost layer. The U-shaped conductor includes two slots for passing through the stator core slots, and welding ends and insertion ends twisted in opposite directions at both ends of the corresponding slots. The two insertion ends inside the slots are twisted in the same direction and connected by an integrally formed conductor.

[0015] Furthermore, the other end of all the first and second coil loops on the outermost or innermost coil group is connected to a second S-shaped conductor. The second S-shaped conductor includes a groove passing through the iron core slot, and welding ends and plug ends twisted in opposite directions at both ends of the groove. The twisting direction of the welding ends of all the second S-shaped conductors is the same.

[0016] Furthermore, it also includes a star-shaped connecting conductor arranged in an arc along the circumference, which is connected to the second S-shaped conductor on all the first coil rings or the second coil rings, and connected to the plug end of the second S-shaped conductor.

[0017] A stator structure includes a stator core, wherein flat wire phase windings as described above are disposed in the stator core slots of the stator core.

[0018] In summary, this utility model has the advantages of reasonable structure, reducing or eliminating the need for special jumper cards, achieving product serialization only by adding standard cards and similar types of jumper cards, and shortening the R&D cycle. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the stator structure in Example 1.

[0020] Figure 2 for Figure 1 A schematic diagram of the structure of a single-phase flat wire winding.

[0021] Figure 3 for Figure 2 A schematic diagram of the structure of two paired coils on the outermost layer.

[0022] Figure 4 for Figure 3 A schematic diagram of a pair of coils on the outermost layer.

[0023] Figure 5for Figure 2 A schematic diagram of the structure of two paired coils on the innermost layer.

[0024] Figure 6 for Figure 5 A schematic diagram of the structure of a pair of coils on the innermost layer.

[0025] Figure 7 for Figure 2 A schematic diagram of the connection structure of the two first coil loops on two adjacent layers of coil groups.

[0026] Figure 8 for Figure 2 A schematic diagram of the connection structure of two second coil loops on two adjacent coil groups.

[0027] Figure 9 for Figure 2 A schematic diagram of the structure in which paired coils are connected in series at the first position.

[0028] Figure 10 for Figure 2 A schematic diagram of the structure in which the paired coils are connected in series at the second position.

[0029] Figure 11 This is a schematic diagram of another structure for a reverse conductor.

[0030] Figure 12 This is a schematic diagram of the overall structure of the stator structure in Example 2.

[0031] Figure 13 This is a schematic diagram of the structure of a single-phase flat wire winding in Example 2.

[0032] Figure 14 for Figure 13 A schematic diagram of the structure in which paired coils are connected in series at the first position.

[0033] Figure 15 for Figure 13 A schematic diagram of the structure in which the paired coils are connected in series at the second position.

[0034] Figure 16 and Figure 17 This is a schematic diagram of the structure of Example 3.

[0035] Figure 18 and Figure 19 This is a schematic diagram of the structure of Example 4.

[0036] Figure 20 and Figure 21 This is a schematic diagram of the structure of Example 5.

[0037] Figure 22 , Figure 23 and Figure 24 This is a schematic diagram of the structure of Example 6.

[0038] Figure 25 and Figure 26 This is a schematic diagram of the structure of Example 7.

[0039] Figure 27 and Figure 28 This is a schematic diagram of the structure of Example 8.

[0040] Figures 29-32 This is a schematic diagram of the structure of Example 9.

[0041] Figure 33 and Figure 34 This is a schematic diagram of the structure of Example 10.

[0042] Figure 35 and Figure 36 This is a schematic diagram of the structure of Example 11.

[0043] Figure 37 and Figure 38 This is a schematic diagram of the structure of Example 12.

[0044] Figure 39 and Figure 40 This is a schematic diagram of the structure of Example 13.

[0045] Figure 41 and Figure 42 This is a schematic diagram of the structure of Example 14.

[0046] Figure 43 and Figure 44 This is a schematic diagram of the structure of Example 15.

[0047] Figure 45 and Figure 46 This is a schematic diagram of the structure of Example 16.

[0048] Figures 47-49 This is a schematic diagram of the structure of Example 17.

[0049] Figure 50 and Figure 51 This is a schematic diagram of the structure of Example 18.

[0050] Figure 52 and Figure 53 This is a schematic diagram of the structure of Example 19. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the embodiments.

[0052] Example 1: A stator structure, such as Figure 1 As shown, it includes a stator core, which has stator core slots evenly distributed circumferentially. Three-phase flat wire windings are arranged within the stator core slots, such as... Figure 2 As shown, each phase flat wire winding includes two concentrically arranged coil groups 1. Figure 1 In the middle, the coil group 1 of the three-phase flat wire phase winding forms two concentric loops. Figure 2 The middle section consists of two coil groups 1 of a phase winding made of flat wire, with each coil group 1 having legs located on two adjacent layers of the phase winding. Figure 1 and Figure 2 As can be seen, the outer coil group 1 occupies the first and second layers radially from the outside to the inside, while the inner coil group 1 occupies the third and fourth layers radially from the outside to the inside.

[0053] In this embodiment, each coil group 1 includes two pairs of coils 2 arranged sequentially in circumferentially adjacent slots, such as... Figure 3 and Figure 5 As shown, Figure 3 and Figure 5 Each slot contains two pairs of coils 2, positioned in adjacent circumferential slots. For clarity and accuracy, these are referred to as the first position pair of coils and the second position pair of coils. Figure 3 and Figure 5 In the diagram, the pair of coils 2 on the left is the first position pair of coils, that is, the first pair of coils 2 in the clockwise direction; the pair of coils 2 on the right is the second position pair of coils, that is, the second pair of coils 2 in the clockwise direction.

[0054] Each of the paired coils 2 includes a first coil ring 21 and a second coil ring 22 offset by one magnetic pole position in the circumferential direction. Both the first coil ring 21 and the second coil ring 22 include p-1 U-shaped conductors connected in series in the circumferential direction. The pitch of the U-shaped conductors is Y, and there is a magnetic pole position between two U-shaped conductors connected in series, where p is the number of magnetic pole pairs. Figure 4 and Figure 6 As shown in the figure, the first coil ring 21 is drawn with a dashed line and the second coil ring 22 is drawn with a solid line. In this embodiment, the number of magnetic pole pairs p is 4, the number of stator core slots is 48, the pole pitch K = 6, and the pitch Y = 5. It can be seen from the figure that the first coil ring 21 and the second coil ring 22 both include 3 U-shaped conductors, and the first coil ring 21 and the second coil ring 22 are arranged in an alternating manner, that is, they are offset by one magnetic pole position.

[0055] In the two pairs of coils 2 at corresponding positions on two adjacent coil groups 1, a first bridging hairpin 41 is connected in series between the two first coil rings 21, and a second bridging hairpin 42 is connected in series between the two second coil rings 22. The two legs of the first bridging hairpin 41 and the two legs of the second bridging hairpin 42 are distributed in the adjacent Nth layer and N+1th layer, where N is an even number.

[0056] That is, in two adjacent coil groups 1, such as Figure 3 and Figure 5 As shown, the first paired coil loop 2 (first position paired coil) of the outer layer group 1 in the clockwise direction and the first paired coil loop 2 (first position paired coil) of the inner layer group 1 in the clockwise direction are two paired coils at corresponding positions. The second paired coil loop 2 (second position paired coil) of the outer layer group 1 in the clockwise direction and the second paired coil loop 2 (second position paired coil) of the inner layer group 1 in the clockwise direction are two paired coils at corresponding positions.

[0057] like Figure 7 As shown, in two adjacent coil groups 1, a first bridging hairpin 41 connects the inner first coil ring 21 and the outer first coil ring 21. The first bridging hairpin 41 is drawn with a dashed line in the figure. In this embodiment, the two legs of the outer first coil ring 21 are located in the 1st and 2nd layers, the two legs of the inner first coil ring 21 are located in the 3rd and 4th layers, and the two legs of the first bridging hairpin 41 are located in the 2nd and 3rd layers, so that the first bridging hairpin 41 can connect the two first coil rings 21 of the inner and outer layers in series.

[0058] Correspondingly, such as Figure 8 As shown, in two adjacent coil groups 1, a second bridging clip 42 connects the inner second coil ring 22 and the outer second coil ring 22. The second bridging clip 42 is drawn with a dashed line in the figure. In this embodiment, the two legs of the outer second coil ring 22 are located in the 1st and 2nd layers, the two legs of the inner second coil ring 22 are located in the 3rd and 4th layers, and the two legs of the second bridging clip 42 are located in the 2nd and 3rd layers, so that the second bridging clip 42 can connect the two second coil rings 22 of the inner and outer layers in series.

[0059] Specifically, between two adjacent sets of coil groups 1, the sum of the pitches of the first bridging hairpins 41 connected in series between the first coil loops 21 on the two first position paired coils and the first bridging hairpins 41 connected in series between the first coil loops 21 on the two second position paired coils is 2Y; the sum of the pitches of the second bridging hairpins 42 connected in series between the second coil loops 22 on the two first position paired coils and the second bridging hairpins 42 connected in series between the second coil loops 22 on the two second position paired coils is 2Y. Simultaneously, between two first position paired coils on two adjacent sets of coil groups 1, the pitch of the first bridging hairpins 41 connected in series between the first coil loops 21 is equal to the pitch of the second bridging hairpins 42 connected in series between the second coil loops 22; and between two second position paired coils on two adjacent sets of coil groups 1, the pitch of the first bridging hairpins 41 connected in series between the first coil loops 21 is equal to the pitch of the second bridging hairpins 42 connected in series between the second coil loops 22.

[0060] like Figure 9 As shown, the pitch of the first bridging hairpin 41 connecting the two first-position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two first-position paired coils is also 4. That is, the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two first-position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22. Figure 10 As shown, the pitch of the first bridging hairpin 41 connecting the two paired coils at the second position is 6, and the pitch of the second bridging hairpin 42 connecting the two paired coils at the second position is 6. That is, the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two paired coils at the second position is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22. Furthermore, between two adjacent groups of coils 1, the sum of the pitches of the two first bridging hairpins 41 is 10 = 2Y, and the sum of the pitches of the two second bridging hairpins 42 is 10 = 2Y, where Y = 5.

[0061] In this embodiment, in the two paired coils 2 on the innermost coil group 1, a reverse conductor 5 is connected in series between the first coil ring 21 and the second coil ring 22 on each paired coil 2. The reverse conductor 5 is a U-shaped conductor with both legs located in the innermost layer. The U-shaped conductor includes two slot interiors 61 for passing through the stator core slots, and welding ends 62 and insertion ends 63 twisted in opposite directions at both ends of the corresponding slot interiors 61. The insertion ends 63 of the two slot interiors 61 are twisted in the same direction and connected by an integrally formed conductor, such as... Figure 5 and Figure 6 As shown, Figure 6 The reverse conductor 5 in the diagram is drawn using a double-dotted line.

[0062] Simultaneously, the sum of the pitches of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the first position paired coil and the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the second position paired coil is 2K, where K is the pole pitch. In this embodiment, the pole pitch K = 6, 2K = 12, as shown below. Figure 2 As shown, the pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the first position of the innermost layer is 6 = K. The pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the second position of the innermost layer is 6 = K, where K is the pole pitch. The sum of the pitches of the two reverse conductors 5 is 12, i.e., 2K.

[0063] In specific implementation, the reverse conductor 5 can also be used Figure 10The structure in the middle, namely the reverse conductor 5, includes two first S-shaped conductors 51 with the same twist direction and both located in the innermost or outermost layer. The first S-shaped conductor includes a slot interior 61 for passing through the stator core slot, and a welding end 62 and a plug end 63 twisted in opposite directions and disposed at both ends of the slot interior 61; a bridging conductor 52 is connected in series between the plug ends 63 of the two first S-shaped conductors.

[0064] In this embodiment, the other end of all the first coil rings 21 and second coil rings 22 on the outermost coil group 1 is connected to a second S-shaped conductor. The second S-shaped conductor includes a groove 61 passing through the iron core slot, and welding ends 62 and insertion ends 63 twisted in opposite directions at both ends of the groove 61; the twisting direction of the welding ends 62 of all the second S-shaped conductors is the same. Figure 3 and Figure 4 As shown, Figure 4 The second S-shaped conductor in the diagram is drawn using a double-dotted line.

[0065] like Figure 2 As shown, it also includes a star-point connecting conductor 3 arranged in an arc along the circumference. The star-point connecting conductor 3 is connected to the second S-shaped conductor on all the first coil rings 21 or the second coil rings 22, and is connected to the plug end 63 of the second S-shaped conductor.

[0066] In this embodiment, for any phase winding, at the first position in the clockwise direction, all the first coil loops 21 are connected in series sequentially through the first bridging hairpin 41. Then, the innermost first coil loop 21 is connected to the innermost second coil loop 22 through the reverse conductor 5. All the second coil loops 22 are connected in series sequentially through the second bridging hairpin 42 to form the first branch, such as... Figure 9 As shown. Similarly, at the second position in the clockwise direction, all the first coil loops 21 are connected in series through the first jumper hairpin 41, and then the innermost first coil loop 21 is connected to the innermost second coil loop 22 through the reverse conductor 5. All the second coil loops 22 are connected in series through the second jumper hairpin 42 to form the second branch, as shown. Figure 10 As shown.

[0067] Example 2: As Figures 12-15As shown, in this embodiment, the number of stator core slots is 48, the number of pole pairs p is 4, the pole pitch K = 6, and the pitch Y of the U-shaped conductor is 5. The arrangement of the first coil ring 21, the second coil ring 22, the paired coils 2, the coil group 1, the first bridging hairpin 41, the second bridging hairpin 42, and the reverse conductor 5 is the same as in Embodiment 1. The main difference from Embodiment 1 is that each phase flat wire winding includes 3 concentric coil groups 1. The legs of each coil group 1 are located on two adjacent layers of the phase winding. In the direction from the outside to the inside, the outermost coil group 1 occupies the first and second layers in the radial direction, the middle coil group 1 occupies the third and fourth layers in the radial direction, and the innermost coil group 1 occupies the fifth and sixth layers in the radial direction. Figure 12 As shown, the three sets of coils 1 on the three-phase flat wire phase winding form three concentric ring structures.

[0068] In the two adjacent coil groups 1 on the outer side, as follows Figure 14 As shown, the pitch of the first bridging hairpin 41 connecting the two first position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two first position paired coils is also 4. That is, the pitch of the first bridging hairpin 41 connected in series between the first coil rings 21 on the two first position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil rings 22.

[0069] like Figure 15 As shown, the pitch of the first bridging hairpin 41 connecting the two paired coils at the second position is 6, and the pitch of the second bridging hairpin 42 connecting the two paired coils at the second position is 6. That is, the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two paired coils at the second position is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22. At the same time, the sum of the pitches of the two first bridging hairpins 41 is 4 + 6 = 10, the sum of the pitches of the two second bridging hairpins 42 is 4 + 6 = 10, and Y = 5.

[0070] In the two adjacent coil groups 1 on the inner side, as follows Figure 14 As shown, the pitch of the first bridging hairpin 41 connecting the two first position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two first position paired coils is also 6. That is, the pitch of the first bridging hairpin 41 connected in series between the first coil rings 21 on the two first position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil rings 22.

[0071] like Figure 15As shown, the pitch of the first bridging hairpin 41 connecting the two paired coils at the second position is 4, and the pitch of the second bridging hairpin 42 connecting the two paired coils at the second position is 4. That is, the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two paired coils at the second position is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22. At the same time, the sum of the pitches of the two first bridging hairpins 41 is 6 + 4 = 10, the sum of the pitches of the two second bridging hairpins 42 is 6 + 4 = 10, and Y = 5.

[0072] In this embodiment, the pole distance K = 6, 2K = 12, as shown below. Figures 13-15 As shown, the pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the first position of the innermost layer is 6 = K. The pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the second position of the innermost layer is 6 = K, where K is the pole pitch. The sum of the pitches of the two reverse conductors 5 is 12, i.e., 2K.

[0073] As shown in Table 1 below, in Table 1, the outer layer group represents two adjacent coil groups 1 located on the outside; the inner layer group represents two adjacent coil groups 1 located on the inside; CL6 represents the first or second bridging hairpin with a pitch of 6, CS4 represents the first or second bridging hairpin with a pitch of 4, and Z6 represents the reverse conductor with a pitch of 6.

[0074] Table 1. Hairpin pitch in Example 2

[0075]

[0076] Example 3: This example has the same overall structure as Example 2. The main difference is that the pitch of all first connector hairpins 41 and second connector hairpins 42 is 5. Figure 16 and Figure 17 As shown, in any two adjacent coil groups 1, the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two first position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22; the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two second position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22. Simultaneously, the sum of the pitches of the two first bridging hairpins 41 is 5 + 5 = 10, and the sum of the pitches of the two second bridging hairpins 42 is 5 + 5 = 10, i.e., 2Y.

[0077] As shown in Table 2 below, in Table 2, the outer layer group represents two adjacent coil groups 1 located on the outside; the inner layer group represents two adjacent coil groups 1 located on the inside; C5 represents the first or second bridging hairpin with a pitch of 5, and Z6 represents the reverse conductor with a pitch of 6.

[0078] Table 2. Hairpin pitch in Example 3

[0079]

[0080] Example 4: The overall structure of this example is the same as that of Example 2, and the settings of the first and second jumper hair clips on the two adjacent coil groups 1 on the outside are also the same. The main difference from Example 2 is that, as shown in Example 2... Figure 18 and Figure 19 As shown, in the two adjacent coil groups 1 on the inner side, the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 is 5, that is, the pitch of the first bridging hairpin 41 connected in series between the first coil rings 21 on the two first position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil rings 22; the pitch of the first bridging hairpin 41 connected in series between the first coil rings 21 on the two second position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil rings 22. At the same time, the sum of the pitches of the two first bridging hairpins 41 is 5 + 5 = 10, and the sum of the pitches of the two second bridging hairpins 42 is 5 + 5 = 10, that is, 2Y.

[0081] As shown in Table 3 below, in Table 3, the outer layer group represents two adjacent coil groups 1 located on the outside; the inner layer group represents two adjacent coil groups 1 located on the inside; C5 represents the first or second bridging hairpin with a pitch of 5, CL6 represents the first or second bridging hairpin with a pitch of 6, CS4 represents the first or second bridging hairpin with a pitch of 4, and Z6 represents the reverse conductor with a pitch of 6.

[0082] Table 3. Hairpin pitch in Example 4

[0083]

[0084] Example 5: The overall structure of this example is the same as that of Example 2, and the arrangement of the first and second jumper hair clips on the two adjacent coil groups 1 located on the inner side is also the same. The main difference from Example 2 is that, as shown in Example 2... Figure 10 and Figure 21As shown, in the two adjacent coil groups 1 on the outer side, the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 is 5, that is, the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two first position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22; the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two second position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22. At the same time, the sum of the pitches of the two first bridging hairpins 41 is 5 + 5 = 10, and the sum of the pitches of the two second bridging hairpins 42 is 5 + 5 = 10, i.e., 2Y.

[0085] As shown in Table 4 below, in Table 4, the outer layer group represents two adjacent coil groups 1 located on the outside; the inner layer group represents two adjacent coil groups 1 located on the inside; C5 represents the first or second bridging hairpin with a pitch of 5, CL6 represents the first or second bridging hairpin with a pitch of 6, CS4 represents the first or second bridging hairpin with a pitch of 4, and Z6 represents the reverse conductor with a pitch of 6.

[0086] Table 3. Hairpin pitch in Example 4

[0087]

[0088]

[0089] Example 6: As Figure 22 As shown, the overall structure of this embodiment is the same as that of Embodiment 2. The main difference is that in the two adjacent coil groups 1 on the outer side, as shown in the figure... Figure 23 As shown, the pitch of the first bridging hairpin 41 connecting the two first position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two first position paired coils is 6. The sum of their pitches is 4 + 6 = 10. That is, the sum of the pitches of the first bridging hairpin 41 connected in series between the first coil rings 21 and the second bridging hairpin 42 connected in series between the second coil rings 22 on the two adjacent coil groups 1 is 2Y, where Y = 5.

[0090] like Figure 24 As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 4. The sum of their pitches is 6 + 4 = 10. That is, the sum of the pitches of the first bridging hairpin 41 connected in series between the first coil ring 21 and the second bridging hairpin 42 connected in series between the second coil ring 22 on the two adjacent sets of coil groups 1 is 2Y, where Y = 5.

[0091] In the two adjacent coil groups 1 on the inner side, as follows Figure 23 As shown, the pitch of the first bridging hairpin 41 connecting the two paired coils at the first position is 6, and the pitch of the second bridging hairpin 42 connecting the two paired coils at the first position is 4. The sum of their pitches is 6 + 4 = 10, which is 2Y. Figure 24 As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 6. The sum of their pitches is 4 + 6 = 10, which is 2Y.

[0092] In this embodiment, the pole distance K = 6, as shown below. Figure 22 As shown, the pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the first position of the innermost layer is 7, i.e., K+1. The pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the second position of the innermost layer is 5, i.e., K-1. The sum of the pitches of the two reverse conductors 5 is 7+5=12, i.e., 2K.

[0093] As shown in Table 5 below, in Table 5, the outer layer group represents two adjacent coil groups 1 located on the outside; the inner layer group represents two adjacent coil groups 1 located on the inside; CL6 represents the first or second bridging hairpin with a pitch of 6, CS4 represents the first or second bridging hairpin with a pitch of 4, and Z5 and Z7 represent the reverse conductors with pitches of 5 and 7, respectively.

[0094] Table 5. Hairpin pitch in Example 6

[0095]

[0096] Example 7: This example has the same overall structure as Example 6. The main difference is that the pitch of all first connector hairpins 41 and second connector hairpins 42 is 5. Figure 25 and Figure 26 As shown, between any two adjacent coil groups 1 and two pairs of coils at the first position, the sum of the pitches of the first bridging hairpin 41 connected in series between the first coil loops 21 and the second bridging hairpin 42 connected in series between the second coil loops 22 is 2Y, where Y = 5. Between any two adjacent coil groups 1 and two pairs of coils at the second position, the sum of the pitches of the first bridging hairpin 41 connected in series between the first coil loops 21 and the second bridging hairpin 42 connected in series between the second coil loops 22 is 2Y, where Y = 5.

[0097] As shown in Table 6 below, the outer layer group represents two adjacent coil groups 1 located on the outside; the inner layer group represents two adjacent coil groups 1 located on the inside; C5 represents the first or second bridging hairpin with a pitch of 5; and Z5 and Z7 represent the reverse conductors with pitches of 5 and 7, respectively.

[0098] Table 6. Card issuance pitch in Example 7

[0099]

[0100]

[0101] Example 8: The overall structure of this example is the same as that of Example 6, and the setting of the first and second jumper hair clips on the two adjacent coil groups 1 on the outside is also the same. The main difference from Example 6 is that, as shown in Example 6... Figure 27 and Figure 28 As shown, in the two adjacent coil groups 1 on the inner side, the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 is 5.

[0102] As shown in Table 7 below, the outer layer group represents two adjacent coil groups 1 located on the outside; the inner layer group represents two adjacent coil groups 1 located on the inside; C5 represents the first or second bridging hairpin with a pitch of 5, CL6 represents the first or second bridging hairpin with a pitch of 6, CS4 represents the first or second bridging hairpin with a pitch of 4, and Z5 and Z7 represent the reverse conductors with pitches of 5 and 7, respectively.

[0103] Table 7. Card-spinning pitch in Example 8

[0104]

[0105] Example 9: As Figures 29-32 As shown, in this embodiment, the number of stator core slots is 48, the number of pole pairs p is 4, the pole pitch K = 6, and the pitch Y of the U-shaped conductor is 5. The arrangement of the first coil ring 21, the second coil ring 22, the paired coils 2, the coil group 1, the first bridging hairpin 41, the second bridging hairpin 42, and the reverse conductor 5 is the same as in embodiment 1. The main difference from embodiment 1 is that each phase flat wire winding includes 4 concentric coil groups 1. The legs of each coil group 1 are located on two adjacent layers of the phase winding. In the direction from the outside to the inside, the outermost coil group 1 occupies the first and second layers in the radial direction, the next outermost coil group 1 occupies the third and fourth layers in the radial direction, the next innermost coil group 1 occupies the fifth and sixth layers in the radial direction, and the innermost coil group 1 occupies the seventh and eighth layers in the radial direction. Figure 29 As shown, the four coil groups 1 on the three-phase flat wire phase winding form four concentric ring structures.

[0106] In the two outermost adjacent coil groups 1, that is, on the outermost coil group 1 and the second outermost coil group 1, as follows: Figure 31 As shown, the pitch of the first bridging hairpin 41 connecting the two first-position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two first-position paired coils is also 4. Figure 32 As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 6.

[0107] In the two adjacent coil groups 1 located in the middle, namely the outermost coil group 1 and the innermost coil group 1, as follows: Figure 31 As shown, the pitch of the first bridging hairpin 41 connecting the two first-position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two first-position paired coils is also 6. Figure 32 As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 4.

[0108] In the two innermost adjacent coil groups 1, namely the second innermost coil group 1 and the innermost coil group 1, as follows: Figure 31 As shown, the pitch of the first bridging hairpin 41 connecting the two first-position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two first-position paired coils is also 4. Figure 32 As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 6.

[0109] That is, in any two adjacent coil groups, in any two adjacent coil groups 1, the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two first position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22; the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two second position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22. Simultaneously, the sum of the pitches of the two first bridging hairpins 41 located in the same layer is 10, and the sum of the pitches of the two second bridging hairpins 42 is 10, i.e., 2Y, Y = 5.

[0110] As shown in Table 8 below, in Table 8, the outer layer group represents the adjacent outermost and second outermost coil group 1; the middle layer group represents the adjacent second outermost and second innermost coil group 1; the inner layer group represents the adjacent second innermost and innermost coil group 1; CL6 represents the first or second bridging hairpin with a pitch of 6, CS4 represents the first or second bridging hairpin with a pitch of 4, and Z6 represents the reverse conductor with a pitch of 6.

[0111] Table 8. Card-spinning pitch in Example 9

[0112]

[0113] Example 10: This example has the same overall structure as Example 9. The main difference from Example 9 is that the pitch of all first connector hairpins 41 and second connector hairpins 42 is 5. Figure 33 and Figure 34 As shown, in any two adjacent coil groups, in any two adjacent coil groups 1, the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two first position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22; the pitch of the first bridging hairpin 41 connected in series between the first coil loops 21 on the two second position paired coils is equal to the pitch of the second bridging hairpin 42 connected in series between the second coil loops 22. Simultaneously, the sum of the pitches of the two first bridging hairpins 41 located in the same layer is 10, and the sum of the pitches of the two second bridging hairpins 42 is 10, i.e., 2Y, Y = 5.

[0114] As shown in Table 9 below, in Table 9, the outer layer group represents the adjacent outermost and second outermost coil group 1; the middle layer group represents the adjacent second outermost and second innermost coil group 1; the inner layer group represents the adjacent second innermost and innermost coil group 1; C5 represents the first or second bridging hairpin with a pitch of 5, CL6 represents the first or second bridging hairpin with a pitch of 6, CS4 represents the first or second bridging hairpin with a pitch of 4, and Z6 represents the reverse conductor with a pitch of 6.

[0115] Table 9. Hairpin pitch in Example 10

[0116]

[0117] Example 11: The overall structure of this example, the first and second bridging hairpins in the two outermost adjacent coil groups 1 and the two middle adjacent coil groups 1 are the same as in Example 9. The main difference from Example 9 is that in the two innermost adjacent coil groups 1, i.e., the second innermost coil group 1 and the innermost coil group 1, the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 is 5. Figure 35 and Figure 36 As shown.

[0118] As shown in Table 10 below, in Table 10, the outer layer group represents the adjacent outermost and second outermost coil group 1; the middle layer group represents the adjacent second outermost and second innermost coil group 1; the inner layer group represents the adjacent second innermost and innermost coil group 1; C5 represents the first or second bridging hairpin with a pitch of 5, CL6 represents the first or second bridging hairpin with a pitch of 6, CS4 represents the first or second bridging hairpin with a pitch of 4, and Z6 represents the reverse conductor with a pitch of 6.

[0119] Table 10. Card-spinning pitch in Example 11

[0120]

[0121] Example 12: The overall structure of this example, and the first and second bridging hairpins in the two outermost adjacent coil groups 1, are the same as in Example 9. The main difference from Example 9 is that in the two middle adjacent coil groups 1 and the two innermost adjacent coil groups 1, the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 is 5. Figure 37 and Figure 38 As shown in Table 11, the specific card issuance span arrangement is as follows.

[0122] Table 11. Hairpin pitch in Example 12

[0123]

[0124]

[0125] Example 13: As Figure 39 and Figure 40 As shown, the overall structure of this embodiment is the same as that of embodiment 9. The main difference from embodiment 9 is that the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 in the two outermost adjacent coil groups 1 and the two innermost adjacent coil groups 1 is 5.

[0126] In the two adjacent coil groups 1 located in the middle, such as Figure 39 As shown, the pitch of the first bridging hairpin 41 connecting the two first-position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two first-position paired coils is also 4. Figure 40 As shown, the pitch of the first bridging hairpin 41 connecting the two paired coils at the second position is 6, and the pitch of the second bridging hairpin 42 connecting the two paired coils at the second position is 6. The hairpin span arrangement in this embodiment is shown in Table 12 below.

[0127] Table 12. Hairpin pitch in Example 13

[0128]

[0129] Example 14: The overall structure of this example, and the first and second bridging hairpins in the two innermost adjacent coil groups 1, are the same as in Example 9. The main difference from Example 9 is that in the two outermost adjacent coil groups 1 and the two middle adjacent coil groups 1, the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 is 5. Figure 41 and Figure 42 As shown in Table 13, the specific card issuance span arrangement is as follows.

[0130] Table 13. Hairpin pitch in Example 14

[0131]

[0132] Example 15: The overall structure of this example, the first and second bridging hairpins in the two outermost adjacent coil groups 1 are the same as in Example 9. The main difference from Example 9 is that in the two middle adjacent coil groups 1, the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 is 5.

[0133] In the two innermost adjacent coil groups 1, as follows: Figure 43 As shown, the pitch of the first bridging hairpin 41 connecting the two first-position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two first-position paired coils is also 6. Figure 44 As shown, the pitch of the first bridging hairpin 41 connecting the two paired coils at the second position is 4, and the pitch of the second bridging hairpin 42 connecting the two paired coils at the second position is 4. The hairpin span arrangement in this embodiment is shown in Table 14 below.

[0134] Table 14. Hairpin pitch in Example 15

[0135]

[0136] Example 16: This example has the same overall structure as Example 9. The main difference from Example 9 is that in the two adjacent coil groups 1 on the outermost side, the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 is 5.

[0137] In the two adjacent coil groups 1 located in the middle, as follows: Figure 45 As shown, the pitch of the first bridging hairpin 41 connecting the two first-position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two first-position paired coils is also 4. Figure 46As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 6.

[0138] In the two innermost adjacent coil groups 1, as follows: Figure 45 As shown, the pitch of the first bridging hairpin 41 connecting the two first-position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two first-position paired coils is also 6. Figure 46 As shown, the pitch of the first bridging hairpin 41 connecting the two paired coils at the second position is 4, and the pitch of the second bridging hairpin 42 connecting the two paired coils at the second position is 4. The hairpin span arrangement in this embodiment is shown in Table 15 below.

[0139] Table 15. Hairpin pitch in Example 16

[0140]

[0141] Example 17: As Figure 47 As shown, this embodiment has the same overall structure as embodiment 9, and the main difference from embodiment 9 is that...

[0142] In the two outermost adjacent coil groups 1, that is, on the outermost coil group 1 and the second outermost coil group 1, as follows: Figure 48 As shown, the pitch of the first bridging hairpin 41 connecting the two paired coils at the first position is 4, and the pitch of the second bridging hairpin 42 connecting the two paired coils at the first position is 6. The sum of their pitches is 4 + 6 = 10. Figure 49 As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 4. The sum of their pitches is 6 + 4 = 10.

[0143] In the two adjacent coil groups 1 located in the middle, namely the outermost coil group 1 and the innermost coil group 1, as follows: Figure 48 As shown, the pitch of the first bridging hairpin 41 connecting the two first-position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two first-position paired coils is 4. The sum of their pitches is 6 + 4 = 10. Figure 49 As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 6. The sum of their pitches is 4 + 6 = 10.

[0144] In the two innermost adjacent coil groups 1, namely the second innermost coil group 1 and the innermost coil group 1, as follows: Figure 48As shown, the pitch of the first bridging hairpin 41 connecting the two paired coils at the first position is 4, and the pitch of the second bridging hairpin 42 connecting the two paired coils at the first position is 6. The sum of their pitches is 4 + 6 = 10. Figure 49 As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 4. The sum of their pitches is 6 + 4 = 10.

[0145] Specifically, the sum of the pitches of the first bridging hairpin 41 connected in series between the first coil loops 21 and the second bridging hairpin 42 connected in series between the second coil loops 22 in any two adjacent sets of coil groups 1 at the first position is 2Y, where Y = 5. Similarly, the sum of the pitches of the first bridging hairpin 41 connected in series between the first coil loops 21 and the second bridging hairpin 42 connected in series between the second coil loops 22 in any two adjacent sets of coil groups 1 at the second position is 2Y, where Y = 5.

[0146] In this embodiment, the pole distance K = 6, as shown below. Figure 47 As shown, the pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the first position of the innermost layer is 5, i.e., K-1. The pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the second position of the innermost layer is 7, i.e., K+1. The sum of the pitches of the two reverse conductors 5 is 5+7=12, i.e., 2K. The hairpin span arrangement of this embodiment is shown in Table 16 below.

[0147] Table 16. Hairpin pitch in Example 17

[0148]

[0149] Example 18: As Figure 50 and Figure 51 As shown, this embodiment has the same overall structure as embodiment 17. The main difference is that the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 is 5. The pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the innermost first position paired coil is 7, i.e., K+1. The pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the innermost second position paired coil is 5, i.e., K-1. The sum of the pitches of the two reverse conductors 5 is 7+5=12, i.e., 2K, K=6. The hairpin span arrangement of this embodiment is shown in Table 17 below.

[0150] Table 17. Hairpin pitch in Example 18

[0151]

[0152] Example 19: This example has the same overall structure as Example 17, but the main difference is that...

[0153] In the two outermost adjacent coil groups 1, that is, on the outermost coil group 1 and the second outermost coil group 1, as follows: Figure 52 As shown, the pitch of the first bridging hairpin 41 connecting the two paired coils at the first position is 4, and the pitch of the second bridging hairpin 42 connecting the two paired coils at the first position is 6. The sum of their pitches is 4 + 6 = 10. Figure 53 As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 4. The sum of their pitches is 6 + 4 = 10.

[0154] In the two adjacent coil groups 1 located in the middle, namely the outermost coil group 1 and the innermost coil group 1, as follows: Figure 52 As shown, the pitch of the first bridging hairpin 41 connecting the two first-position paired coils is 6, and the pitch of the second bridging hairpin 42 connecting the two first-position paired coils is 4. The sum of their pitches is 6 + 4 = 10. Figure 53 As shown, the pitch of the first bridging hairpin 41 connecting the two second position paired coils is 4, and the pitch of the second bridging hairpin 42 connecting the two second position paired coils is 6. The sum of their pitches is 4 + 6 = 10.

[0155] In the two innermost adjacent coil groups 1, namely the second innermost coil group 1 and the innermost coil group 1, the pitch of all the first bridging hairpins 41 and the second bridging hairpins 42 is 5, and the sum of their pitches is 5 + 5 = 10. Figure 52 and Figure 53 As shown.

[0156] The pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the first position of the innermost layer is 7, i.e., K+1. The pitch of the reverse conductor 5 connected in series between the first coil loop 21 and the second coil loop 22 in the second position of the innermost layer is 5, i.e., K-1. The sum of the pitches of the two reverse conductors 5 is 7+5=12, i.e., 2K, K=6. The hairpin span arrangement of this embodiment is shown in Table 18 below.

[0157] Table 18. Hairpin pitch in Example 19

[0158]

[0159] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flat wire phase winding, characterized in that, Each phase winding includes at least two concentric coil groups (1), the legs of each coil group (1) are located on two adjacent layers of the phase winding, and each includes at least two pairs of coils (2) arranged sequentially in adjacent slots in the circumferential direction. The pairs of coils (2) include a first coil ring (21) and a second coil ring (22) arranged with a magnetic pole position offset in the circumferential direction. The first coil ring (21) and the second coil ring (22) each include p-1 U-shaped conductors connected in series in the circumferential direction. The pitch of the U-shaped conductors is Y, and there is a magnetic pole position between the two U-shaped conductors connected in series. p is the number of magnetic pole pairs. In the two pairs of coils (2) at corresponding positions on the two adjacent coil groups (1), a first bridging hairpin (41) is connected in series between the two first coil loops (21), and a second bridging hairpin (42) is connected in series between the two second coil loops (22). The two legs of the first bridging hairpin (41) and the two legs of the second bridging hairpin (42) are distributed in the adjacent Nth layer and N+1th layer, where N is an even number. In the paired coils (2) located on the innermost or outermost coil group (1), a reverse conductor (5) is connected in series between the first coil loop (21) and the second coil loop (22).

2. The flat wire phase winding as described in claim 1, characterized in that, The paired coils (2) are arranged in two sequentially in adjacent slots in the circumferential direction, namely a first position paired coil and a second position paired coil; between two adjacent groups of coils (1), the sum of the pitches of the first bridging hairpins (41) connected in series between the first coil rings (21) on the two first position paired coils and the first bridging hairpins (41) connected in series between the first coil rings (21) on the two second position paired coils is 2Y; the sum of the pitches of the second bridging hairpins (42) connected in series between the second coil rings (22) on the two first position paired coils and the second bridging hairpins (42) connected in series between the second coil rings (22) on the two second position paired coils is 2Y.

3. The flat wire phase winding as described in claim 2, characterized in that, The sum of the pitches of the reverse conductor (5) connected in series between the first coil loop (21) and the second coil loop (22) in the first position paired coil and the reverse conductor (5) connected in series between the first coil loop (21) and the second coil loop (22) in the second position paired coil is 2K, where K is the pole pitch.

4. The flat wire phase winding as described in claim 2, characterized in that, Between two first position paired coils on two adjacent coil groups (1), the pitch of the first bridging hairpin (41) connected in series between the first coil rings (21) is equal to the pitch of the second bridging hairpin (42) connected in series between the second coil rings (22); the pitch of the reverse conductor (5) connected in series between the first coil ring (21) and the second coil ring (22) in the first position paired coils located in the innermost or outermost layer is K, where K is the pole pitch; Between two second-position paired coils on two adjacent sets of coil groups (1), the pitch of the first bridging hairpin (41) connected in series between the first coil rings (21) is equal to the pitch of the second bridging hairpin (42) connected in series between the second coil rings (22); the pitch of the reverse conductor (5) connected in series between the first coil ring (21) and the second coil ring (22) in the second-position paired coils located in the innermost or outermost layer is K, where K is the pole pitch.

5. The flat wire phase winding as described in claim 2, characterized in that, Between two pairs of coils at the first position on two adjacent coil groups (1), the sum of the pitches of the first bridging hairpin (41) connected in series between the first coil rings (21) and the second bridging hairpin (42) connected in series between the second coil rings (22) is 2Y; between two pairs of coils at the second position on two adjacent coil groups (1), the sum of the pitches of the first bridging hairpin (41) connected in series between the first coil rings (21) and the second bridging hairpin (42) connected in series between the second coil rings (22) is 2Y; the pitches of the two reverse conductors (5) are K+1 and K-1, respectively, where K is the pole pitch.

6. The flat wire phase winding as described in claim 1, characterized in that, The reverse conductor (5) includes two first S-shaped conductors (51) with the same twist direction and both located in the innermost or outermost layer. The first S-shaped conductor includes a slot interior (61) for passing through the stator core slot, and a welding end (62) and a plug end (63) twisted in opposite directions and disposed at both ends of the slot interior (61). A jumper conductor (52) is connected in series between the plug ends (63) of the two first S-shaped conductors.

7. The flat wire phase winding as described in claim 1, characterized in that, The reverse conductor (5) is a U-shaped conductor with both legs located in the outermost or innermost layer. The U-shaped conductor includes two slot interiors (61) for passing through the stator core slots, and welding ends (62) and insertion ends (63) twisted in opposite directions at both ends of the corresponding slot interiors (61). The insertion ends (63) of the two slot interiors (61) are twisted in the same direction and connected by an integrally formed conductor.

8. The flat wire phase winding as described in claim 1, characterized in that, All the first coil rings (21) and second coil rings (22) on the outermost or innermost coil group (1) are connected to a second S-shaped conductor at the other end. The second S-shaped conductor includes a slot interior (61) passing through the iron core slot, and a welding end (62) and a plug end (63) twisted in opposite directions at both ends of the slot interior (61). The twisting direction of the welding ends (62) of all the second S-shaped conductors is the same.

9. The flat wire phase winding as described in claim 8, characterized in that, It also includes a star-point connecting conductor (3) arranged in an arc along the circumference, the star-point connecting conductor (3) being connected to the second S-shaped conductor on all the first coil rings (21) or the second coil rings (22), and connected to the plug end (63) of the second S-shaped conductor.

10. A stator structure, characterized in that, It includes a stator core, wherein a flat wire phase winding as described in any one of claims 1 to 9 is provided in the stator core slot of the stator core.

Images