A motor stator and a motor

Abstract

The present invention discloses a motor stator and a motor, comprising: a stator core having a plurality of slots formed on a radially inner surface of the stator core and spaced apart at a predetermined slot pitch in a circumferential direction of the stator core; a stator winding mounted on the stator core, the stator winding having Q pole-pair coils, and Q / number of slots per pole per phase = P, where P is an integer; the stator winding is three-phase, and the number of slots per pole per phase is 3; the stator winding includes: a first coil group and a third coil group sleeved from outside to inside in sequence; by using fewer types of coil units and a simple arrangement method, the use of busbars and bus bars can be reduced, and the branches and neutral points of each phase winding can be arranged in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a motor stator and a motor. Background Art

[0002] The stator winding includes a plurality of hairpin coils. The plurality of hairpin coils are inserted into the slots of the stator core in a certain arrangement manner to form the windings of the required single-phase motor or polyphase motor. In the prior art, there are many types of hairpin coils used, and the arrangement manner is complex. A large number of busbars and busbars are required to connect the branches and neutral points of each phase winding. The manufacturing process is complex, the production cost is high, and the processing efficiency is low. Summary of the Invention

[0003] Embodiments of the present invention provide a motor stator and a motor. The types of coil units used are few, and the arrangement manner is simple. The use of busbars and busbars can be reduced, and the branches and neutral points of each phase winding can be arranged in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing the production cost, and improving the processing efficiency.

[0004] Embodiments of the present invention provide a motor stator, including:

[0005] A stator core having a plurality of slots formed on the radially inner surface of the stator core and spaced apart at a predetermined slot pitch in the circumferential direction of the stator core;

[0006] A stator winding mounted on the stator core,

[0007] The stator winding has Q pole-pair coils, and Q / number of slots per pole per phase = P, where P is an integer; the stator winding is three-phase, and the number of slots per pole per phase is 3;

[0008] The stator winding includes: a first coil group and a third coil group sleeved in sequence from outside to inside;

[0009] The first coil group includes a plurality of first segmented coil units, and any one of the first segmented coil units has 2 hairpin coils with different pitches;

[0010] The plurality of first segmented coil units of the first coil group are sequentially arranged in the same layer of the slots of the stator core along the circumferential direction of the stator core;

[0011] The third coil group includes a plurality of third segmented coil units, and any one of the third segmented coil units has hairpin coils with the same pitch;

[0012] The plurality of third segmented coil units of the third coil group are sequentially arranged in the same layer of the slots of the stator core along the circumferential direction of the stator core;

[0013] The pitch of the hairpin coils in the first segmented coil unit is different from the pitch of the hairpin coils in the third segmented coil unit.

[0014] Furthermore, the pitch of the hairpin coils in the second segmented coil unit is the same as that in the first segmented coil unit.

[0015] Furthermore, the pitch of the hairpin coils in the second segmented coil unit is the same as that in the third segmented coil unit.

[0016] Furthermore, the first segmented coil unit has at least one long-pitch hairpin coil or at least one short-pitch hairpin coil.

[0017] Furthermore, the third segmented coil unit has hairpin coils with a full pitch.

[0018] Furthermore, the first segmented coil unit has one long-pitch hairpin coil and two short-pitch hairpin coils, or the first segmented coil unit has two long-pitch hairpin coils and one short-pitch hairpin coil;

[0019] Furthermore, each hairpin coil of each segmented coil unit in each coil group of the stator winding includes: a first outer-slot end portion, a first inner-slot portion, a first outer-slot turning portion, a second inner-slot portion, and a second outer-slot end portion connected in sequence. The first inner-slot portion and the second inner-slot portion are located in different slots. The outer-slot turning portion of each hairpin coil of each segmented coil unit in each coil group of the stator winding is located on one side of the outer end of the slot of the stator core, and the outer-slot end portion of each hairpin coil of each segmented coil unit in each coil group of the stator winding is located on the other side of the outer end of the slot of the stator core.

[0020] Furthermore, the extending directions of the outer-slot end portions of each hairpin coil of each segmented coil unit in the first coil group in the circumferential direction of the stator core are the same. The extending directions of the outer-slot end portions of each hairpin coil of each segmented coil unit in the third coil group in the circumferential direction of the stator core are the same. The extending directions of the outer-slot end portions of each hairpin coil of each segmented coil unit in the first coil group and the extending directions of the outer-slot end portions of each hairpin coil of each segmented coil unit in the third coil group are opposite in the circumferential direction of the stator core.

[0021] Furthermore, the inner-slot portion of each hairpin coil of each segmented coil unit of the stator winding and its circumferentially extending outer-slot end portion are located on the same layer of the stator core.

[0022] Furthermore, the extending directions of each outer-slot end portion of each hairpin coil of each segmented coil unit in each coil group of the stator winding and the outer-slot end portion adjacent to it radially of the stator core are opposite in the circumferential direction of the stator core.

[0023] Furthermore, the outer ends of the first slots and the outer ends of the second slots have extension ends. Except for the extension ends connected to the lead wires, the N-1 extension ends and the N-layer extension ends that are adjacent and located in the same radial direction of the stator core are connected, where N is an even number.

[0024] An embodiment of the present invention also provides a motor, including: a rotor and the motor stator described in any one of the above embodiments.

[0025] The motor in the technical solution of the embodiment of the present invention includes:

[0026] A stator core having a plurality of slots formed on the radial inner surface of the stator core and spaced apart at a predetermined slot pitch along the circumferential direction of the stator core; a stator winding mounted on the stator core, wherein the stator winding has Q pole-pair coils, and Q / number of slots per pole per phase = P, where P is an integer; the stator winding is three-phase, and the number of slots per pole per phase is 3; the stator winding includes: a first coil group and a third coil group sleeved from outside to inside in sequence; wherein, the first coil group includes a plurality of first segmented coil units, and any one of the first segmented coil units has 2 hairpin coils with different pitches; the plurality of first segmented coil units of the first coil group are arranged in sequence along the circumferential direction of the stator core in the same layer of the stator core slots; the third coil group includes a plurality of third segmented coil units, and any one of the third segmented coil units has hairpin coils with the same pitch; the plurality of third segmented coil units of the third coil group are arranged in sequence along the circumferential direction of the stator core in the same layer of the stator core slots; the pitch of the hairpin coils in the first segmented coil unit is different from the pitch of the hairpin coils in the third segmented coil unit; by using a single conductor to form the motor winding, not only the busbars between phases are eliminated, realizing direct connection within each phase, but also the lead wires can be arranged in any slot and any layer, reducing the production cost and improving the processing efficiency. Description of the Drawings

[0027] Figure 1 It is a structural diagram of a motor stator provided by an embodiment of the present invention;

[0028] Figure 2 It is a structural diagram of a motor stator winding provided by an embodiment of the present invention;

[0029] Figure 3 It is a structural diagram of a first coil group 110 provided by an embodiment of the present invention;

[0030] Figure 4 It is a structural diagram of a first segmented coil unit 210A provided by an embodiment of the present invention;

[0031] Figure 5Structural diagram of a third coil group 130 provided by an embodiment of the present invention;

[0032] Figure 6 Structural diagram of a third segmented coil unit 230 provided by an embodiment of the present invention;

[0033] Figure 7 Structural diagram of a second coil group 120 provided by an embodiment of the present invention;

[0034] Figure 8 Structural diagram of a second segmented coil unit 220A provided by an embodiment of the present invention;

[0035] Figure 9 Another structural diagram of a second coil group 120 provided by an embodiment of the present invention;

[0036] Figure 10 Another structural diagram of a second segmented coil unit 220B provided by an embodiment of the present invention;

[0037] Figure 11 Another structural diagram of a first segmented coil unit 210B provided by an embodiment of the present invention;

[0038] Figure 12 Another structural diagram of a motor stator winding provided by an embodiment of the present invention;

[0039] Figure 13 Another structural diagram of a motor stator provided by an embodiment of the present invention;

[0040] Figure 14 Another structural diagram of a motor stator winding provided by an embodiment of the present invention;

[0041] Figure 15 Another schematic diagram of the planar expansion of a phase of the motor stator winding provided by an embodiment of the present invention;

[0042] Figure 16 Another schematic diagram of the planar expansion of a phase of the motor stator winding provided by an embodiment of the present invention; Detailed implementation manners

[0043] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0044] The present invention provides a motor stator. Figure 1 、 Figure 3 、 Figure 5 、Figure 7 , Figure 9 , Figure 13 Among them, the extending direction of A1A2 is parallel to the axial direction of the stator core, the extending direction of B1B2 is the circumferential direction of the stator core, and O1O2, O1O3 and O1O4 are three extending directions drawn as examples along the radial direction of the stator core.

[0045] Combined with Figures 1 to 3 As shown, the motor stator 100 includes: a stator core 20 having a plurality of slots 21 formed on the radial inner surface of the stator core 20 and spaced apart at a predetermined slot pitch along the circumferential direction of the stator core 20;

[0046] As Figures 1 to 2 shown, a stator winding 10, the stator winding 10 is mounted on the stator core 20, wherein the stator winding 10 has Q pole-pair coils, and Q / number of slots per pole per phase = P, P is an integer; the stator winding 10 is three-phase, and the number of slots per pole per phase is 3;

[0047] The stator winding 10, the stator winding 10 is mounted on the stator core 20, wherein the stator winding 10 is three-phase (i.e., U-phase, V-phase, W-phase), and the number of slots per pole per phase is 3;

[0048] In this embodiment, each magnetic pole of the rotor is provided with three slots 21. The rotor has twelve magnetic poles and this is the case for each phase of the three-phase stator winding 10. The twelve magnetic poles of the rotor correspond to the Q pole-pair coils of the stator winding (Q is 6 in this embodiment), Q / number of slots per pole per phase = P, P is an integer; 6 / 3 = 2, and P being 2 is an integer; correspondingly, the number of slots 21 provided in the stator core 20 is equal to 108 (i.e., 3X12X3).

[0049] In addition, in this embodiment, the stator core 20 is defined by two adjacent slots 21 to form a tooth portion 22. The stator core 20 is formed by laminating a plurality of annular magnetic steel plates at two end faces 25, 26 in the axial direction of the stator core. A plurality of insulating papers are inserted into the slots of these magnetic steel plates (not shown in this figure). It should be noted that other conventional metal plates can also be used instead of magnetic steel plates.

[0050] The stator winding 20 includes: a first coil group 110 and a third coil group 130 sleeved in sequence from outside to inside; Combined with Figure 2 , in this embodiment, the first coil group 110 is arranged on the outer side of the stator core in the radial direction, that is, away from the radial inner surface direction of the stator core, and the third coil group 130 is arranged on the inner side of the stator core in the radial direction, that is, close to the radial inner surface direction of the stator core;

[0051] Accordingly, each coil group in the stator winding 10 can also be arranged with the first coil group 110 sleeved from the outside to the inside in sequence, disposed on the inner side in the radial direction of the stator core, that is, away from the radial inner surface of the stator core, and the third coil group 130 is disposed on the outer side in the radial direction of the stator core, that is, close to the radial inner surface of the stator core.

[0052] As Figures 3 to 4 shown, the first coil group 110 includes a plurality of first segmented coil units 210, and any one of the first segmented coil units 210 has 2 hairpin coils with different pitches;

[0053] In this embodiment, the first coil 110 includes 18 first segmented coil units 210, and any one of the first segmented coil units 210 has 3 hairpin coils, namely the first hairpin coil 2101, the second hairpin coil 2102, and the third hairpin coil 2103. The slot pitch between the two slot interiors 21011 of the first hairpin coil 2101 is X, the slot pitch between the two slot interiors 21011 of the second hairpin coil 2102 is X, and the slot pitch between the two slot interiors 21011 of the third hairpin coil 2103 is Y (in this embodiment, the slot pitch X is 10 and the slot pitch Y is 7). That is, the first segmented coil unit 210 has 2 hairpin coils with different pitches. In this embodiment, the pitches of the first hairpin coil 2101 and the second hairpin coil 2102 are the same, and the pitch of the third hairpin coil 2103 is different from that of the first hairpin coil 2102 and the second hairpin coil 2102.

[0054] The multiple first segmented coil units 210 of the first coil group 110 are arranged in sequence along the circumferential direction of the stator core on the same layer in the stator core slot 21;

[0055] In this embodiment, the 18 first segmented coil units 210 of the first coil group 110 are arranged in sequence along the circumferential direction of the stator core on the same layer in the stator core slot 21. Specifically, the slot interiors 21011 of the 3 hairpin coils in the first segmented coil unit 210 are all located on the same layer in the radial direction of the stator core in different slots, as Figure 4As shown, the first slot interior 21011 (i.e., the left slot interior) of the first hairpin coil 2101 is located in the first layer of the first slot of the stator core 20. The first slot interior 21011 (i.e., the left slot interior) of the second hairpin coil 2102 is located in the first layer of the second slot of the stator core 20. The first slot interior 21011 (i.e., the left slot interior) of the third hairpin coil 2103 is located in the first layer of the third slot of the stator core 20. The second slot interior 21011 (i.e., the right slot interior) of the first hairpin coil 2101 is located in the first layer of the eleventh slot of the stator core 20. The second slot interior 21011 (i.e., the right slot interior) of the second hairpin coil 2102 is located in the first layer of the twelfth slot of the stator core 20. The third slot interior 21011 (i.e., the right slot interior) of the third hairpin coil 2103 is located in the first layer of the tenth slot of the stator core 20, as Figure 3 shown, the 18 first segmented coil units 210 of the first coil group 110 are sequentially arranged along the circumferential direction of the stator core in the same layer in the radial direction within 108 slots of the stator core 20. Further, the slot pitch between the first slot interior of the first hairpin 2101 of a first segmented coil unit 210-1 adjacent in the same phase and the first slot interior of the first hairpin 2101 of another first segmented coil unit 210-4 adjacent in the same phase is 18. Further, the first slot interior 21011 of the first hairpin coil 2101 of the first segmented coil unit 210-1 is located in the first slot of the stator core 20, and the first slot interior 21011 of the first hairpin coil 2101 of another first segmented coil unit 210-4 is located in the nineteenth slot of the stator core 20. Correspondingly, the first coil group 110 of the V phase, the first coil group 110 of the W phase, and the first coil group 110 of the U phase are sequentially shifted by 3 slots or 6 slots along the circumferential direction of the stator core. Further, in this embodiment, the first coil group 110 is arranged on the outer side of the stator core 20, that is, the first layer is in the direction away from the radial inner surface of the stator core. Correspondingly, the first coil group 110 can also be arranged on the inner side of the stator core 20, that is, the first layer is in the direction close to the radial inner surface of the stator core.

[0056] As Figure 5 、 Figure 6 shown, the third coil group 130 includes a plurality of third segmented coil units 230, and any one of the third segmented coil units has hairpin coils with the same pitch;

[0057] Combined with Figure 5 、 Figure 6, in this embodiment, the third coil group 130 includes 18 third segmented coil units 230. Any third segmented coil unit 230 has 3 hairpin coils, namely the first hairpin coil 2301, the second hairpin coil 2302, and the third hairpin coil 2303. The slot pitch between the two slot interiors 21011 of the first hairpin coil 2301 is Z, the slot pitch between the two slot interiors 21011 of the second hairpin coil 2302 is Z, and the slot pitch between the two slot interiors 21011 of the third hairpin coil 2303 is Z (in this embodiment, the slot pitch Z is 9), that is, the third segmented coil unit 230 has three hairpin coils with the same pitch.

[0058] The multiple third segmented coil units 230 of the third coil group 130 are arranged in sequence along the circumferential direction of the stator core in the same layer of the stator core slots 21;

[0059] Combined with Figure 5 , Figure 6 , in this embodiment, the 18 third segmented coil units 230 of the third coil group 130 are arranged in sequence along the circumferential direction of the stator core in the same layer of the stator core slots 21. Specifically, the slot interiors 21011 of the 3 hairpin coils in the third segmented coil unit 230 are all located in the same layer in the radial direction of different slots of the stator core. As Figure 6 shown, the first slot interior 21011 (i.e., the left slot interior) of the first hairpin coil 2301 is located in the Nth layer (N is an even number) of the first slot of the stator core 20, the first slot interior 21011 (i.e., the left slot interior) of the second hairpin coil 2302 is located in the Nth layer of the second slot of the stator core 20, the first slot interior 21011 (i.e., the left slot interior) of the third hairpin coil 2303 is located in the Nth layer of the third slot of the stator core 20, the second slot interior 21011 (i.e., the right slot interior) of the first hairpin coil 2301 is located in the Nth layer of the tenth slot of the stator core 20, the second slot interior 21011 (i.e., the right slot interior) of the second hairpin coil 2302 is located in the Nth layer of the eleventh slot of the stator core 20, and the third slot interior 21011 (i.e., the right slot interior) of the third hairpin coil 2303 is located in the Nth layer of the twelfth slot of the stator core 20 (in this embodiment, N is 4). As Figure 5As shown, 18 third segmented coil units 230 of the third coil group 130 are sequentially arranged in the same layer in the radial direction in 108 slots of the stator core 20 along the circumferential direction of the stator core. Further, the slot pitch between the inner part of the first slot of the first hairpin 2301 of one adjacent third segmented coil unit 230-1 in the same phase and the inner part of the first slot of the first hairpin 2301 of another adjacent third segmented coil unit 230-4 in the same phase is 18. Further, the inner part 21011 of the first slot of the first hairpin coil 2301 of the third segmented coil unit 230-1 is located in the first slot of the stator core 20, and the inner part 21011 of the first slot of the first hairpin coil 2301 of another third segmented coil unit 230-4 is located in the 19th slot of the stator core 20. Correspondingly, the third coil group 130 of the V phase, the third coil group 130 of the W phase and the third coil group 130 of the U phase are sequentially moved 3 slots or 6 slots along the circumferential direction of the stator core. Further, in this embodiment, the third coil group 130 is arranged on the inner side of the stator core 20, that is, the fourth layer is in the direction close to the inner surface of the stator core in the radial direction. Correspondingly, the third coil group 130 can also be arranged on the outer side of the stator core 20, that is, the first layer is in the direction away from the inner surface of the stator core in the radial direction.

[0060] The pitch of the hairpin coils in the first segmented coil unit 210 is different from the pitch of the hairpin coils in the third segmented coil unit 230.

[0061] As Figure 4 、 Figure 6 As shown, in this embodiment, the two different pitches of the hairpin coils in the first segmented coil unit are respectively that the slot pitch between the two inner parts 21011 of the second hairpin coil 2102 (or the first hairpin coil 2101) is X, and the slot pitch between the two inner parts 21011 of the third hairpin coil 2103 is Y (in this embodiment, the slot pitch X is 10 and the slot pitch Y is 7), and the slot pitch between the two inner parts 21011 of the hairpin coils in the third segmented coil unit is Z (in this embodiment, the slot pitch Z is 9), that is, the pitch of the hairpin coils in the first segmented coil unit 210 is different from the pitch of the hairpin coils in the third segmented coil unit 230. By using a single conductor to form the motor winding, not only the busbars between phases are cancelled, and the direct connection between phases can be realized, but also the lead wires can be arranged in any slot and any layer, reducing the production cost and improving the processing efficiency.

[0062] Exemplarily, as Figure 2 shown, it further includes a second coil group 120 arranged between the first coil group 110 and the third coil group 130. As Figures 7 to 10As shown, the second coil group 120 includes a plurality of second segmented coil units 220. Any one of the second segmented coil units 220 has two hairpin coils with different pitches, or any one of the second segmented coil units 220 has hairpin coils with the same pitch;

[0063] Optionally, based on the above embodiment, combined with Figure 2 The stator winding further includes a second coil group 120 disposed between the first coil group 110 and the third coil group 130. Combined with Figure 7 、 Figure 8 , in this embodiment, the second coil group 120 includes 36 second segmented coil units 220A. Any one of the second segmented coil units 220A has three hairpin coils, namely a first hairpin coil 2201A, a second hairpin coil 2202A, and a third hairpin coil 2203A. The slot pitch between the two slots 21011 of the first hairpin coil 2201A is X, the slot pitch between the two slots 21011 of the second hairpin coil 2202A is X, and the slot pitch between the two slots 21011 of the third hairpin coil 2203A is Y (in this embodiment, the slot pitch X is 10 and the slot pitch Y is 7), that is, the second segmented coil unit 220A has two hairpin coils with different pitches. In this embodiment, the pitches of the first hairpin coil 2201A and the second hairpin coil 2202A are the same, and the pitch of the third hairpin coil 2203A is different from that of the first hairpin coil 2201A and the second hairpin coil 2202A.

[0064] Optionally, combined with Figure 2 , the stator winding further includes a second coil group 120 disposed between the first coil group 110 and the third coil group 130. Combined with Figure 9 、 Figure 10 As shown, in this embodiment, the second coil 120 may further include 36 second segmented coil units 220B. Any one of the second segmented coil units 220B has three hairpin coils, namely a first hairpin coil 2201B, a second hairpin coil 2202B, and a third hairpin coil 2203B. The slot pitch between the two slots 21011 of the first hairpin coil 2201B is Z, the slot pitch between the two slots 21011 of the second hairpin coil 2202B is Z, and the slot pitch between the two slots 21011 of the third hairpin coil 2203B is Z (in this embodiment, the slot pitch Z is 9), that is, the third segmented coil unit 220B has three hairpin coils with the same pitch.

[0065] Exemplarily, as Figure 7 、 Figure 9 shown, the multiple second segmented coil units 220A (or 220B) of the second coil group 120 are arranged in adjacent two layers in the stator core slots in sequence along the circumferential direction of the stator core;

[0066] Optionally, based on the above embodiments, in combination with Figure 7 , the 36 second segmented coil units 220A of the second coil group 120 are arranged in adjacent two layers in the stator core slots 21 along the circumferential direction of the stator core. Specifically, the slot interiors 21011 of the 3 hairpin coils in the second segmented coil unit 220A are all located in adjacent two layers in the radial direction of different slots of the stator core. In combination with Figure 8 , the first slot interior 21011 (i.e., the left slot interior) of the first hairpin coil 2201A is located in the (N - 2)-th layer of the first slot of the stator core 20, the first slot interior 21011 (i.e., the left slot interior) of the second hairpin coil 2202A is located in the (N - 2)-th layer of the second slot of the stator core 20, the first slot interior 21011 (i.e., the left slot interior) of the third hairpin coil 2203A is located in the (N - 2)-th layer of the third slot of the stator core 20, the second slot interior 21011 (i.e., the right slot interior) of the first hairpin coil 2201A is located in the (N - 1)-th layer of the eleventh slot of the stator core 20, the second slot interior 21011 (i.e., the right slot interior) of the second hairpin coil 2202A is located in the (N - 1)-th layer of the twelfth slot of the stator core 20, and the third slot interior 21011 (i.e., the right slot interior) of the third hairpin coil 2203A is located in the (N - 1)-th layer of the tenth slot of the stator core 20 (in this embodiment, N is 4);

[0067] Correspondingly, in combination with Figure 9 , the 36 second segmented coil units 220B of the second coil group 120 are arranged in adjacent two layers in the stator core slots 21 along the circumferential direction of the stator core. Specifically, the slot interiors 21011 of the 3 hairpin coils in the second segmented coil unit 220B are all located in adjacent two layers in the radial direction of different slots of the stator core. In combination with Figure 10 , the first slot interior 21011 (i.e., the left slot interior) of the first hairpin coil 2201B is located in the (N - 2)-th layer of the first slot of the stator core 20, the first slot interior 21011 (i.e., the left slot interior) of the second hairpin coil 2202B is located in the (N - 2)-th layer of the second slot of the stator core 20, the first slot interior 21011 (i.e., the left slot interior) of the third hairpin coil 2203B is located in the (N - 2)-th layer of the third slot of the stator core 20, the second slot interior 21011 (i.e., the right slot interior) of the first hairpin coil 2201B is located in the (N - 1)-th layer of the tenth slot of the stator core 20, the second slot interior 21011 (i.e., the right slot interior) of the second hairpin coil 2202B is located in the (N - 1)-th layer of the eleventh slot of the stator core 20, and the third slot interior 21011 (i.e., the right slot interior) of the third hairpin coil 2203B is located in the (N - 1)-th layer of the twelfth slot of the stator core 20;

[0068] In combination with Figure 7 、Figure 9 , 36 second segmented coil units 220 of the second coil group 120 are sequentially arranged in two adjacent radial layers within the 108 slots of the stator core 20 along the circumferential direction of the stator core. Further, the pitch between two adjacent first segmented coil units 220-1 and 220-4 in the same phase is 9. Further, the first slot interior 22011 of the first hairpin coil 2201 of the second segmented coil unit 220-1 is located in the first slot of the stator core 20, and the first slot interior 21011 of the first hairpin coil 2201 of another second segmented coil unit 220-4 is located in the tenth slot of the stator core 20. Correspondingly, the V-phase second coil group 120, the W-phase second coil group 120, and the U-phase second coil group 120 are sequentially shifted by 3 slots or 6 slots along the circumferential direction of the stator core. Further, in this embodiment, the second coil group 120 is arranged in the middle N-2 layer and N-3 layer of the stator core 20. That is, the inner layer closer to the radial inner surface of the stator core is the Nth layer. In this embodiment, it is located in the second and third radial layers of the stator core.

[0069] Optionally, as Figure 2 shown, the hairpin coil pitch of the second segmented coil unit 220A is the same as that of the first segmented coil unit 210.

[0070] Optionally, on the basis of the above embodiment, in combination with Figure 4 、 Figure 8 shown, in this embodiment, the first hairpin coil 2201A, the second hairpin coil 2202A, and the third hairpin coil 2203A of the second segmented coil unit 220A. The slot pitch between the two slot interiors 21011 of the first hairpin coil 2201A is X, the slot pitch between the two slot interiors 21011 of the second hairpin coil 2202A is X, and the slot pitch between the two slot interiors 21011 of the third hairpin coil 2203A is Y (in this embodiment, the slot pitch X is 10 and the slot pitch Y is 7); the first hairpin coil 2101, the second hairpin coil 2102, and the third hairpin coil 2103 of the first segmented coil unit 210. The slot pitch between the two slot interiors 21011 of the first hairpin coil 2101 is X, the slot pitch between the two slot interiors 21011 of the second hairpin coil 2102 is X, and the slot pitch between the two slot interiors 21011 of the third hairpin coil 2103 is Y (in this embodiment, the slot pitch X is 10 and the slot pitch Y is 7). Thus, it can be seen that the hairpin coil pitch of the second segmented coil unit 220A is the same as that of the first segmented coil unit 210.

[0071] Optionally, as Figure 6 、 Figure 10 shown, the hairpin coil pitch of the second segmented coil unit 220B is the same as that of the third segmented coil unit 230.

[0072] Combined Figure 6 、 Figure 10 As shown, in this embodiment, the first hairpin coil 2201B, the second hairpin coil 2202B, and the third hairpin coil 2203B of the second segmented coil unit 220B, where the slot pitch between the two slots 21011 inside the first hairpin coil 2201B is Z, the slot pitch between the two slots 21011 inside the second hairpin coil 2202B is Z, and the slot pitch between the two slots 21011 inside the third hairpin coil 2203B is Z (in this embodiment, the slot pitch Z is 9). For the first hairpin coil 2301, the second hairpin coil 2302, and the third hairpin coil 2303 of the third segmented coil unit 230, the slot pitch between the two slots 21011 inside the first hairpin coil 2301 is Z, the slot pitch between the two slots 21011 inside the second hairpin coil 2302 is Z, and the slot pitch between the two slots 21011 inside the third hairpin coil 2303 is Z (in this embodiment, the slot pitch Z is 9). Thus, it can be seen that the hairpin coil pitches of the second segmented coil unit 220B and the third segmented coil unit 230 are the same.

[0073] Exemplarily, as Figure 4 、 Figure 11 shown, the first segmented coil unit 210 has at least one long pitch hairpin coil or at least one short pitch hairpin coil.

[0074] Optionally, based on the above embodiment, combined with Figure 4 、 Figure 11 , the first segmented coil unit 210A has a first hairpin coil 2101, a second hairpin coil 2102, and a third hairpin coil 2103, where the slot pitch between the two slots 21011 inside the first hairpin coil 2101 is X, the slot pitch between the two slots 21011 inside the second hairpin coil 2102 is X, and the slot pitch between the two slots 21011 inside the third hairpin coil 2103 is Y (in this embodiment, the slot pitch X is 10 and the slot pitch Y is 7). In this embodiment, a hairpin coil with a slot pitch of 9 between the two slots of the hairpin coil is a full pitch, a hairpin coil with a slot pitch greater than 9 is a long pitch, and a hairpin coil with a slot pitch less than 9 is a short pitch. Thus, it can be seen that, as Figure 4 in, the first segmented coil unit 210A includes two long pitch hairpin coils and one short pitch hairpin coil; correspondingly, combined with Figure 11 、 Figure 12, the first segmented coil unit 210B has a first hairpin coil 2101, a second hairpin coil 2102, and a third hairpin coil 2103. The slot pitch between the two slot interiors 21011 of the first hairpin coil 2101 is X, the slot pitch between the two slot interiors 21011 of the second hairpin coil 2102 is Y, and the slot pitch between the two slot interiors 21011 of the third hairpin coil 2103 is Y (in this embodiment, the slot pitch X is 11 and the slot pitch Y is 8). In this embodiment, a hairpin coil with a slot pitch of 9 between the two slot interiors is a full pitch, a hairpin coil with a slot pitch greater than 9 is a long pitch, and a hairpin coil with a slot pitch less than 9 is a short pitch; thus, as Figure 4 the first segmented coil unit 210A in

[0075] exemplarily, as Figure 5 shown, the third segmented coil unit 230 has a hairpin coil with a full pitch.

[0076] Optionally, on the basis of the above embodiment, in combination with Figure 5 , the third segmented coil unit 230 has a first hairpin coil 2301, a second hairpin coil 2302, and a third hairpin coil 2303. The slot pitch between the two slot interiors 21011 of the first hairpin coil 2301 is Z, the slot pitch between the two slot interiors 21011 of the second hairpin coil 2302 is Z, and the slot pitch between the two slot interiors 21011 of the third hairpin coil 2303 is Z (in this embodiment, the slot pitch Z is 9). In this embodiment, a hairpin coil with a slot pitch of 9 between the two slot interiors is a full pitch.

[0077] exemplarily, as Figure 4 、 Figure 11 shown, the first segmented coil unit 210 has one hairpin coil with a long pitch and two hairpin coils with short pitches, or, the first segmented coil unit 210 has two hairpin coils with long pitches and one hairpin coil with a short pitch;

[0078] Optionally, on the basis of the above embodiment, in combination with Figure 4 shown, the first segmented coil unit 210A has a first hairpin coil 2101, a second hairpin coil 2102, and a third hairpin coil 2103. The slot pitch between the two slot interiors 21011 of the first hairpin coil 2101 is X, the slot pitch between the two slot interiors 21011 of the second hairpin coil 2102 is X, and the slot pitch between the two slot interiors 21011 of the third hairpin coil 2103 is Y (in this embodiment, the slot pitch X is 10 and the slot pitch Y is 7). Thus, as Figure 4The first segmented coil unit 210 therein includes two hairpin coils with long pitches and one hairpin coil with a short pitch;

[0079] Optionally, on the basis of the above embodiments, in combination with Figure 11 , Figure 12 , the first segmented coil unit 210B has a first hairpin coil 2101, a second hairpin coil 2102, and a third hairpin coil 2103. The slot pitch between the two slot interiors 21011 of the first hairpin coil 2101 is X, the slot pitch between the two slot interiors 21011 of the second hairpin coil 2102 is Y, and the slot pitch between the two slot interiors 21011 of the third hairpin coil 2103 is Y (in this embodiment, the slot pitch X is 11 and the slot pitch Y is 8). Thus, as Figure 4 the first segmented coil unit 210A therein includes one hairpin coil with a long pitch and two hairpin coils with short pitches;

[0080] Exemplarily, as Figures 1 - 11 shown, each hairpin coil of each segmented coil unit in each coil group of the stator winding 10 includes: a first outer-slot end portion 21031, a second inner-slot portion 21011, a first outer-slot turning portion 21021, a second inner-slot portion 21011, and a second outer-slot end portion 21031 that are connected in sequence. The first inner-slot portion 21011 and the second inner-slot portion 2011 are located in different slots. The outer-slot turning portion 21021 of each hairpin coil of each segmented coil unit in each coil group of the stator winding 10 is located on one side of the outer end 26 of the stator core 20, and the outer-slot end portions 21031 of each hairpin coil of each segmented coil unit in each coil group of the stator winding 10 are located on the other side of the outer end 25 of the stator core 20.

[0081] Optionally, on the basis of the above embodiments, in combination with Figures 1 - 11 , in this embodiment, the hairpin coil includes: a first outer-slot end portion 21031, a first inner-slot portion 21011, a first outer-slot turning portion 21021, a second inner-slot portion 21011, and a second outer-slot end portion 21031 that are connected in sequence. The first inner-slot portion 21011 and the second inner-slot portion 21011 are located in different slots. The first outer-slot turning portions 2102 of the coil groups 110, 120, and 130 of the stator winding are all located on one side of the outer end 26 of the stator core, and the first outer-slot end portions 21031 and the second outer-slot end portions 21031 of the coil groups 110, 120, and 130 of the stator winding are located on the other side of the outer end 25 of the stator core.

[0082] Exemplarily, as Figures 1 - 11As shown, the outer-slot ends 21031 of each hairpin coil of each segmented coil unit 210 of the first coil group 110 extend in the same direction in the circumferential direction of the stator core. The outer-slot ends 21031 of each hairpin coil of each segmented coil unit 230 of the third coil group 130 extend in the same direction in the circumferential direction of the stator core. The outer-slot ends 21031 of each hairpin coil of each segmented coil unit 210 of the first coil group 110 extend in a direction opposite to that of the outer-slot ends 21031 of each hairpin coil of each segmented coil unit 230 of the third coil group 130 in the circumferential direction of the stator core.

[0083] Optionally, based on the above embodiments, in combination with Figures 2 to 6 , in this embodiment, all the outer-slot ends 21031 of the first coil group 110 extend in the same direction (to the right) in the circumferential direction of the stator core. All the outer-slot ends 21031 of the third coil group 130 extend in the same direction (to the left) in the circumferential direction of the stator core. The extending direction of all the outer-slot ends of the first coil group 110 in the circumferential direction of the stator core is opposite to that of all the outer-slot ends of the third coil group 130 in the circumferential direction of the stator core;

[0084] Correspondingly, in this embodiment, all the outer-slot ends 21031 of the first coil group 110 extend in the same direction (to the left) in the circumferential direction of the stator core. All the outer-slot ends 21031 of the third coil group 130 extend in the same direction (to the right) in the circumferential direction of the stator core. The extending direction of all the outer-slot ends of the first coil 110 group in the circumferential direction of the stator core is opposite to that of all the outer-slot ends of the third coil group 130 in the circumferential direction of the stator core.

[0085] Exemplarily, as Figures 1 - 11 shown, the inner-slot part 21011 of each hairpin coil of each segmented coil unit of the stator winding and its outer-slot end 21031 extending in the circumferential direction of the stator core are located on the same layer of the stator core.

[0086] Optionally, based on the above embodiments, in combination with Figures 1 - 11, the inner part 21011 of the first hairpin coil 2101 of the first segmented coil unit 210 of the stator winding and its outer end part 21031 extending circumferentially of the stator core are both located in the first layer, the inner part 21011 of the second hairpin coil 2102 and its outer end part 21031 extending circumferentially of the stator core are both located in the first layer, and the inner part 21011 of the third hairpin coil 2103 and its outer end part 21031 extending circumferentially of the stator core are both located in the first layer; the inner part 21011 of the first slot and the outer end part 21031 of the first slot of the first hairpin coil 2201 of the second segmented coil unit 220 of the stator winding are both located in the (N - 2)th layer, the inner part 21011 of the second slot and the outer end part 21031 of the second slot of the first hairpin coil 2201 are both located in the (N - 1)th layer, the inner part 21011 of the first slot and the outer end part 21031 of the first slot of the second hairpin coil 2202 are both located in the (N - 2)th layer, the inner part 21011 of the second slot and the outer end part 21031 of the second hairpin coil 2202 are both located in the (N - 1)th layer, the inner part 21011 of the first slot and the outer end part 21031 of the first slot of the third hairpin coil 2203 are both located in the (N - 2)th layer, and the inner part 21011 of the second slot and the outer end part 21031 of the third hairpin coil 2203 are both located in the (N - 1)th layer; the inner part 21011 of the first hairpin coil 2301 of the third segmented coil unit 230 of the stator winding and its outer end part 21031 extending circumferentially of the stator core are both located in the Nth layer, the inner part 21011 of the second hairpin coil 2302 and its outer end part 21031 extending circumferentially of the stator core are both located in the Nth layer, and the inner part 21011 of the third hairpin coil 2303 and its outer end part 21031 extending circumferentially of the stator core are both located in the Nth layer, where N is an even number. (In this embodiment, N is equal to 6)

[0087] Exemplarily, as Figures 1 - 11 shown, the extending directions in the circumferential direction of the stator core of the outer end parts 21031 of each hairpin coil of each segmented coil unit in each coil group of the stator winding 10 and the outer end parts 21031 adjacent radially to the stator core are opposite to each other.

[0088] Optionally, on the basis of the above embodiment, in combination with Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9, in this embodiment, the outer slot end 21031 of the first coil group 110 is located in the first layer in the radial direction within the stator core slot and extends to the right in the circumferential direction of the stator core. The first outer slot end 21031 of the second coil group 120 is located in the (N - 2)-th layer in the radial direction within the stator core slot and extends to the left in the circumferential direction of the stator core. The second outer slot end 21031 of the second coil group 120 is located in the (N - 1)-th layer in the radial direction within the stator core slot and extends to the right in the circumferential direction of the stator core. The outer slot end 21031 of the third coil group 110 is located in the N-th layer in the radial direction within the stator core slot and extends to the left in the circumferential direction of the stator core. It can be seen that the extending directions of two radially adjacent outer slot ends 21031 in the stator core are opposite in the circumferential direction of the stator core (in this embodiment, N is 6).

[0089] Exemplarily, as Figures 1 - 11 shown, the first outer slot end 21031 and the second outer slot end 21031 have extending ends 5. Except for the extending ends connected to the lead wires 4, the extending ends 5 of the (N - 1)-th layer and the extending ends 5 of the N-th layer that are adjacent and located in the same radial direction of the stator core are connected to each other, where N is an even number.

[0090] Optionally, on the basis of the above embodiment, in combination with Figures 1 to 14 shown, in this embodiment, both the first outer slot end 21031 and the second outer slot end 21031 have extending ends 5. Except for the extending ends 5 connected to the lead wires 4, (the lead wires in each embodiment of the present invention include phase terminals and neutral points, that is, include U-phase terminals, V-phase terminals, W-phase terminals, U-phase neutral points, V-phase neutral points, W-phase neutral points,) the remaining extending ends of the first layer and the extending ends of the second layer that are adjacent and located in the same radial direction of the stator core are connected to each other, the extending ends of the third layer and the extending ends of the fourth layer that are adjacent and located in the same radial direction of the stator core are connected to each other, and the extending ends of the fifth layer and the extending ends of the sixth layer that are adjacent and located in the same radial direction of the stator core are connected to each other. Further, the extending ends of two connected outer slot ends in the stator winding are all located in the odd-numbered layer and the even-numbered layer that are radially adjacent in the stator core. The types of coil units used are few and the arrangement method is simple, which can reduce the use of busbars and busbars, realize the branch circuits and neutral points of each phase winding in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing the production cost, and improving the processing efficiency.

[0091] Manufacturing method:

[0092] Exemplarily, as Figure 1 shown, the stator winding 10 is star-connected. The U-phase winding, V-phase winding, and W-phase winding. The U-phase winding is connected in parallel by three branches U1, U2, and U3, and each branch is connected in series. The connection of the V-phase winding and W-phase winding is the same as that of the U-phase winding, and will not be elaborated again;

[0093] The stator winding is sequentially provided with a first coil group 110, a second coil group 120, and a third coil group 130 from outside to inside (the second coil group can be set to 0, 1, 2, 3, any integer value);

[0094] Exemplarily, as Figures 1 - 4 shown, the first coil group 110 is composed of a first U-phase coil group, a first V-phase coil group, and a first W-phase coil group. Each first coil group 110 of each phase is 6 first segmented coil units 210. The first coil groups of the three phases are 18 first segmented coil units 210. Each first segmented coil unit 210 is composed of 3 U-shaped hairpins 2101, 2102, and 2103;

[0095] First, the 18 first segmented coil units 210 are sequentially inserted into the adjacent 108 slots at the other end 25 of the stator core from one end 26 of the stator core. The first segmented coil unit 210-1 is inserted into the first layer in the first slot, the second slot, the third slot, the tenth slot, the eleventh slot, and the twelfth slot of the stator core. The first segmented coil unit 210-2 (the first first segmented coil unit 210 of the W phase) is inserted into the first layer in the seventh slot, the eighth slot, the ninth slot, the sixteenth slot, the seventeenth slot, and the eighteenth slot of the stator core. The first segmented coil unit 210-3 (the first first segmented coil unit 210 of the V phase) is inserted into the first layer in the thirteenth slot, the fourteenth slot, the fifteenth slot, the twenty-second slot, the twenty-third slot, and the twenty-fourth slot of the stator core. The first segmented coil unit 210-4 (the second first segmented coil unit 210 of the U phase) is inserted into the first layer in the nineteenth slot, the twentieth slot, the twenty-first slot, the twenty-eighth slot, the twenty-ninth slot, and the thirtieth slot of the stator core. Then, the first segmented coil unit 210-5 (the second first segmented coil unit 210 of the W phase) is inserted into the first layer in the twenty-fifth slot, the twenty-sixth slot, the twenty-seventh slot, the thirty-fourth slot, the thirty-fifth slot, and the thirty-sixth slot of the stator core, until the first segmented coil 210-18 (the sixth first segmented coil unit 210 of the V phase) is inserted into the first layer in the one hundred and third slot, the one hundred and fourth slot, the one hundred and fifth slot, the fourth slot, the fifth slot, and the sixth slot of the stator core;

[0096] Exemplarily, as Figures 1 - 8As shown, secondly, the second coil group 120 is composed of a second U-phase coil group, a second V-phase coil group, and a second W-phase coil group. Each phase's second coil group 120 has 6 second segmented coil units 220, and the three-phase second coil group has 36 second segmented coil units 210. Each second segmented coil unit 220 is composed of 3 U-shaped hairpins 2201, 2202, and 2203;

[0097] First, the 36 second segmented coil units 220 are sequentially inserted into 108 adjacent slots at the other end 25 of the stator core from one end 26 of the stator core. The second segmented coil unit 220-1 is inserted into the second layer in the first slot, the second layer in the second slot, the second layer in the third slot, the third layer in the tenth slot, the third layer in the eleventh slot, and the third layer in the twelfth slot of the stator core. The second segmented coil unit 220-2 (the first second segmented coil unit 220 of the W phase) is inserted into the second layer in the fourth slot, the second layer in the fifth slot, the second layer in the sixth slot, the third layer in the thirteenth slot, the third layer in the fourteenth slot, and the third layer in the fifteenth slot of the stator core. The second segmented coil unit 220-3 (the first second segmented coil unit 220 of the V phase) is inserted into the second layer in the seventh slot, the second layer in the eighth slot, the second layer in the ninth slot, the third layer in the sixteenth slot, the third layer in the seventeenth slot, and the third layer in the eighteenth slot of the stator core. The second segmented coil unit 220-4 (the second second segmented coil unit 220 of the U phase) is inserted into the second layer in the tenth slot, the second layer in the eleventh slot, the second layer in the twelfth slot, the third layer in the nineteenth slot, the third layer in the twentieth slot, and the third layer in the twenty-first slot of the stator core. Then, the second segmented coil unit 220-5 (the second second segmented coil unit 220 of the W phase) is inserted into the second layer in the thirteenth slot, the second layer in the fourteenth slot, the second layer in the fifteenth slot, the third layer in the twenty-second slot, the third layer in the twenty-third slot, and the third layer in the twenty-fourth slot of the stator core, until the second segmented coil 220-18 (the sixth second segmented coil unit 220 of the V phase) is inserted into the second layer in the one hundred and sixth slot, the second layer in the one hundred and seventh slot, the second layer in the one hundred and eighth slot, the third layer in the tenth slot, the third layer in the eleventh slot, and the third layer in the twelfth slot of the stator core;

[0098] Insert the second second coil group into the fourth and fifth layers in the stator core slots in the same way;

[0099] Exemplarily, such as Figures 1 - 6As shown, secondly, the third coil group 130 is composed of a third coil group of phase U, a third coil group of phase V, and a third coil group of phase W. Each third coil group 130 of each phase is composed of 6 third segmented coil units 230, and the three-phase third coil group is composed of 18 third segmented coil units 230. Each third segmented coil unit 230 is composed of 3 U-shaped hairpins 2301, 2302, and 2303;

[0100] First, the 18 third segmented coil units 230 are successively inserted into the adjacent 108 slots at the other end 25 of the stator core from one end 26 of the stator core. The third segmented coil unit 230-1 is inserted into the sixth layer in the first slot, the sixth layer in the second slot, the sixth layer in the third slot, the sixth layer in the tenth slot, the sixth layer in the eleventh slot, and the sixth layer in the twelfth slot of the stator core. The third segmented coil unit 230-2 (the first first segmented coil unit 230 of phase W) is inserted into the sixth layer in the seventh slot, the sixth layer in the eighth slot, the sixth layer in the ninth slot, the sixth layer in the sixteenth slot, the sixth layer in the seventeenth slot, and the sixth layer in the eighteenth slot of the stator core. The third segmented coil unit 230-3 (the first third segmented coil unit 230 of phase V) is inserted into the sixth layer in the thirteenth slot, the sixth layer in the fourteenth slot, the sixth layer in the fifteenth slot, the sixth layer in the twenty-second slot, the sixth layer in the twenty-third slot, and the sixth layer in the twenty-fourth slot of the stator core. The first segmented coil unit 230-4 (the second third segmented coil unit 230 of phase U) is inserted into the sixth layer in the nineteenth slot, the sixth layer in the twentieth slot, the sixth layer in the twenty-first slot, the sixth layer in the twenty-eighth slot, the sixth layer in the twenty-ninth slot, and the sixth layer in the thirtieth slot of the stator core. Then, the third segmented coil unit 210-5 (the second third segmented coil unit 230 of phase W) is inserted into the sixth layer in the twenty-fifth slot, the sixth layer in the twenty-sixth slot, the sixth layer in the twenty-seventh slot, the sixth layer in the thirty-fourth slot, the sixth layer in the thirty-fifth slot, and the sixth layer in the thirty-sixth slot of the stator core, until the third segmented coil 230-18 (the sixth third segmented coil unit 230 of phase V) is inserted into the sixth layer in the one hundred and third slot, the sixth layer in the one hundred and fourth slot, the sixth layer in the one hundred and fifth slot, the sixth layer in the fourth slot, the sixth layer in the fifth slot, and the sixth layer in the sixth slot of the stator core;

[0101] As Figures 1 - 8As shown, finally, the inner part 21011 of the stator winding in the stator core slot 21 extends axially to the outside of the other end 25 of the stator core 20. The outer end part of the slot outside the stator core (i.e., the outer end part of the first coil group 110) located in the first layer outside the stator iron slot bends and extends 3 slot pitches (i.e., 3d) in the same circumferential direction (to the right) of the stator core. Correspondingly, the outer end part of the slot outside the stator core (i.e., an outer end part of the second coil group 120) located in the second layer outside the stator core slot bends and extends 3 slot pitches (i.e., 3d) in the same circumferential direction (to the left) of the stator core. Correspondingly, the outer end part of the slot outside the stator core (i.e., the other outer end part of the second coil group 120) located in the third layer outside the stator core slot bends and extends 3 slot pitches (i.e., 3d) in the same circumferential direction (to the right) of the stator core. Correspondingly, the outer end part of the slot outside the stator core (i.e., an outer end part of the second second coil group 120) located in the fourth layer outside the stator core slot bends and extends 3 slot pitches (i.e., 3d) in the same circumferential direction (to the left) of the stator core. Correspondingly, the outer end part of the slot outside the stator core (i.e., the other outer end part of the second second coil group 120) located in the fifth layer outside the stator core slot bends and extends 3 slot pitches (i.e., 3d) in the same circumferential direction (to the right) of the stator core. Correspondingly, the outer end part of the slot outside the stator iron slot (i.e., the outer end part of the third coil group 130) located in the sixth layer outside the stator core slot bends and extends 3 slot pitches (i.e., 3d) in the same circumferential direction (to the left) of the stator core, forming a three-phase stator winding.

[0102] The stator winding 10 is star-connected. The U-phase winding, V-phase winding, and W-phase winding. The U-phase winding is connected in parallel by three branches U1, U2, and U3, and each branch is connected in series. The connection of the V-phase winding and W-phase winding is the same as that of the U-phase winding, and will not be elaborated here again;

[0103] Furthermore, the terminals of the three branches U1, U2, and U3 in the U-phase winding of the three-phase stator winding can be connected to three outer end parts 21031 of any slot and any layer in the U-phase winding. The neutral point can be connected to the outer end part 21031 that is radially adjacent to the outer end part 21031 to which the terminals of the three branches U1, U2, and U3 in the U-phase winding are connected. In this embodiment, the terminals of the three branches U1, U2, and U3 of the U-phase winding are connected to three outer end parts 21031 of the adjacent slots in the second layer in the radial direction of the stator core. The neutral point of the three branches U1, U2, and U3 of the U-phase winding is connected to three outer end parts 21031 of the first layer in the same radially adjacent layer of the stator core. The remaining two radially adjacent outer end parts in the stator core are connected to form the stator winding in this embodiment. In this embodiment, the positional relationship between the U-phase terminal and the outer end part to which the neutral point is connected can be interchanged. There is no loop current in the parallel branches. Because each branch is completely symmetric in structure, there is no loop current.

[0104] The present invention also provides an embodiment, such as Figure 15As shown, in this embodiment, the stator winding 10 adopts a first coil group 110, a second coil group 120 (220B), and a third coil group 130. The stator winding 10 is star-connected, with U-phase winding, V-phase winding, and W-phase winding, combined with Figure 15 , the U-phase winding is connected in parallel by three branches U1, U2, and U3, and each branch is connected in series. The V-phase winding and W-phase winding are connected in the same way as the U-phase winding, so no further description is given here; in this embodiment, the positional relationship between the U-phase terminal and the outer-slot end connected to the neutral point can be interchanged. There is no loop current in the parallel branches. Because each branch is completely symmetric in structure, there is no loop current.

[0105] The present invention also provides an embodiment, as Figure 13 shown, the stator winding 10 is star-connected, with U1-phase winding, V1-phase winding, and W1-phase winding. The U1-phase winding is connected in series by three branches U11, U12, and U13, and each branch is connected in series. The V1-phase winding and W1-phase winding are connected in the same way as the U1-phase winding, so no further description is given here; the three phases U, V, and W of the stator winding 10 are formed. The types of coil units used are few, and the arrangement method is simple, which can reduce the use of busbars and busbars, and realize that the branches and neutral points of each phase winding are arranged in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0106] The present invention also provides an embodiment, as Figure 14 shown, the stator winding 10 is star-connected, with U1-phase winding, V1-phase winding, and W1-phase winding. The U1-phase winding is connected in series by three branches U11, U12, and U13, and each branch is connected in series. The V-phase winding and W-phase winding are connected in the same way as the U-phase winding, so no further description is given here; the three phases U1, V, and W1 of the stator winding 10 are formed. The types of coil units used are few, and the arrangement method is simple, which can reduce the use of busbars and busbars, and realize that the terminals and neutral points of the branches of each phase winding are arranged in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0107] Figure 13 The difference from the Figure 14 embodiment is that the second coil group 120 in the middle of the stator winding is different. The second coil group 120 in the middle of the stator winding in Fig. 13 adopts 2 second segmented coil units 220A, while the second coil group 120 in the middle of the stator winding in Fig. 14 adopts 2 second segmented coil units 220B.

[0108] The present invention also provides an embodiment, as Figure 16As shown, the stator winding 10 of this embodiment adopts a first coil group 110, a second coil group 120 (220B), and a third coil group 130. The stator winding 10 is star-connected, including the U-phase winding, the V-phase winding, and the W-phase winding. Combining Figure 15 , the U-phase winding is formed by connecting three branches U1, U2, and U3 in series, with each branch connected in series. The connection of the V-phase winding and the W-phase winding is the same as that of the U-phase winding, so it will not be elaborated here again. The types of coil units used are few and the arrangement method is simple, which can reduce the use of busbars and busbars, and enable the branch terminals and neutral points of each phase winding to be set in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0109] The embodiment of the present invention also provides a motor, including: the radially inner surface of the stator core and the motor stator described in any of the above embodiments.

[0110] The motor provided by the embodiment of the present invention includes the motor stator in the above embodiment. Therefore, the motor provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be elaborated here again.

[0111] In the description of the embodiment of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0112] Finally, it should be noted that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A motor stator, comprising: A stator core having a plurality of slots formed on a radially inner surface of the stator core and spaced apart at a predetermined slot pitch in a circumferential direction of the stator core; A stator winding mounted on the stator core, wherein the stator winding has Q pole-pair coils, and Q / number of slots per pole per phase = P, and P is an integer; the stator winding is three-phase, and the number of slots per pole per phase is 3; The stator winding includes: a first coil group and a third coil group sleeved from outside to inside in sequence; wherein the first coil group includes a plurality of first segmented coil units, and any one of the first segmented coil units has 2 hairpin coils with different pitches; The plurality of first segmented coil units of the first coil group are arranged in sequence along the circumferential direction of the stator core in the same layer in the stator core slots; The third coil group includes a plurality of third segmented coil units, and any one of the third segmented coil units has hairpin coils with the same pitch; The plurality of third segmented coil units of the third coil group are arranged in sequence along the circumferential direction of the stator core in the same layer in the stator core slots; The pitch of the hairpin coils in the first segmented coil units is different from the pitch of the hairpin coils in the third segmented coil units; It further includes a second coil group provided between the first coil group and the third coil group, and the second coil group includes a plurality of second segmented coil units, and any one of the second segmented coil units has 2 hairpin coils with different pitches, or any one of the second segmented coil units has hairpin coils with the same pitch; The plurality of second segmented coil units of the second coil group are arranged in sequence along the circumferential direction of the stator core in two adjacent layers in the stator core slots; The first segmented coil unit has one long-pitch hairpin coil and two short-pitch hairpin coils, or the first segmented coil unit has two long-pitch hairpin coils and one short-pitch hairpin coil.

2. The motor stator according to claim 1, wherein The pitch of the hairpin coils of the second segmented coil unit is the same as that of the hairpin coils of the first segmented coil unit.

3. The motor stator according to claim 1, wherein, The pitch of the hairpin coils of the second segmented coil unit is the same as that of the hairpin coils of the third segmented coil unit.

4. The stator of the motor according to claim 1, wherein, The third segmented coil unit has hairpin coils with integral pitch.

5. The motor stator according to any one of claims 1 or 2, characterized in that, Each hairpin coil of each segmented coil unit in each coil group of the stator winding includes: a first outer-slot end portion, a first inner-slot portion, a first outer-slot turning portion, a second inner-slot portion, and a second outer-slot end portion connected in sequence. The first inner-slot portion and the second inner-slot portion are located in different slots. The outer-slot turning portion of each hairpin coil of each segmented coil unit in each coil group of the stator winding is located on one side of the outer end of the stator core slot, and the outer-slot end portion of each hairpin coil of each segmented coil unit in each coil group of the stator winding is located on the other side of the outer end of the stator core slot.

6. The stator of the motor according to claim 5, characterized in that, The circumferential extension directions of the outer-slot ends of each hairpin coil of each segmented coil unit of the first coil group are the same. The circumferential extension directions of the outer-slot ends of each hairpin coil of each segmented coil unit of the third coil group are the same. The circumferential extension directions of the outer-slot ends of each hairpin coil of each segmented coil unit of the first coil group are opposite to those of the outer-slot ends of each hairpin coil of each segmented coil unit of the third coil group.

7. The stator of an electric machine according to claim 5, characterized in that, The inner part of the slot of each hairpin coil of each segmented coil unit of the stator winding and its circumferentially extending outer-slot end are located on the same layer of the stator core.

8. The motor stator according to claim 7, characterized in that, The circumferential extension directions of the outer-slot ends of each hairpin coil of each segmented coil unit of each coil group of the stator winding are opposite to those of the outer-slot ends adjacent to them radially in the stator core.

9. The stator of an electric machine according to claim 5, characterized in that, The first outer-slot end and the second outer-slot end have extension ends. Except for the extension ends connected to the lead wires, the extension ends of the N-1th layer and the Nth layer that are located on the same radius and adjacent in the stator core are connected, where N is an even number.

10. A motor, characterized in that, Comprising: A rotor and the motor stator according to any one of claims 1-9.

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