Motor stator and motor

Abstract

The present invention discloses a motor stator and a motor, comprising: a stator core, wherein the stator core has a plurality of slots formed on a radial inner surface of the stator core and spaced apart at a predetermined slot pitch along a circumferential direction of the stator core; a stator winding, wherein the stator winding is mounted on the stator core, wherein the stator winding is three-phase, has Q pole-pair coils, and Q / number of slots per pole per phase = P, wherein P is an integer and number of slots per pole per phase is greater than or equal to 2, and each phase stator winding is connected in series with each interphase stator winding; the types of coil units used are few and the arrangement is simple, which can reduce the use of busbars and busbars, eliminate the inconsistency between the twisting direction of the outer ends of the slots and the twisted slot spacing, 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.

Description

Technical Field

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

[0002] The stator winding consists of multiple hairpin coils, which are inserted into the slots of the stator core in a specific arrangement to form the windings of the required single-phase or multi-phase motor. The hairpin coils used in the prior art are numerous in type and arrangement, requiring a large number of busbars and busbars to connect the branches of each phase winding and the neutral point.

[0003] In the existing technology, more than 90% of stator windings have more than or equal to 2 slots per pole and per phase. However, if the phases of the stator winding are connected in series, the twisting direction of the outer ends of the coil slots or the twisted slot spacing will be inconsistent, the manufacturing process is complicated, the forming is difficult, the production cost is high, and the processing efficiency is low. Summary of the Invention

[0004] The embodiments of the present invention provide a motor stator and a motor, which use fewer types of coil units and have a simple arrangement method, thereby reducing the use of bus bars and busbars, eliminating the inconsistency between the twisting direction of the outer ends of the slots and the twisted slot spacing, and realizing that the branches and neutral points of each phase winding are set in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0005] An embodiment of the present invention provides a motor stator, comprising:

[0006] 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;

[0007] stator winding, the stator winding is mounted on the stator core,

[0008] The stator winding is three-phase, and has Q pole-pair coils, and Q / number of slots per pole per phase = P, where P is an integer, and the number of slots per pole per phase is greater than or equal to 2, and the stator windings of each phase are connected in series to the stator windings of each phase;

[0009] The stator winding comprises: a first coil group and a third coil group which are sequentially arranged from the inside to the outside;

[0010] The first coil group has a plurality of U-shaped conductors, and the U-shaped conductors include:

[0011] Two slot outer ends, the two slot outer ends being located at the same radial layer of the stator core, the multiple slot outer ends of the multiple U-shaped conductors of the first coil group extending in the same circumferential direction of the stator core and having the same circumferential span;

[0012] The insides of the two slots are located in the same radial layer of the stator core and are separated by a predetermined slot pitch; the insides of the multiple slots of the multiple U-shaped conductors of the first coil group are located in the same radial layer of the stator core in sequence along the circumferential direction of the stator core;

[0013] The third coil group has a plurality of U-shaped conductors, and the U-shaped conductors include:

[0014] Two slot outer ends, the two slot outer ends being located at the same radial layer of the stator core, the multiple slot outer ends of the multiple U-shaped conductors of the third coil group extending in the same circumferential direction and having the same circumferential span;

[0015] The insides of the two slots are located in the same radial layer of the stator core and are separated by a specified slot pitch; the insides of the multiple slots of the multiple U-shaped conductors of the third coil group are located in the same radial layer of the stator core in sequence along the circumferential direction.

[0016] Furthermore, the plurality of U-shaped conductors of the first coil group further include: an outer slot turning portion, the outer slot turning portion being located at an outer end of a stator core slot and connecting two slots of the plurality of U-shaped conductors of the first coil group;

[0017] The plurality of U-shaped conductors of the third coil group further include: an outer slot turning portion, the outer slot turning portion being located at an outer end of a stator core slot and connecting two slots of the plurality of U-shaped conductors of the third coil group;

[0018] The slot pitch of the out-slot turn portions of the plurality of U-shaped conductors of the first coil group is different from the out-slot turn portions of the plurality of U-shaped conductors of the third coil group.

[0019] Furthermore, the present invention further comprises a second coil group disposed between the first coil group and the third coil group, wherein the second coil group comprises a plurality of U-shaped conductors, and the U-shaped conductors comprise:

[0020] Two slot outer ends, the two slot outer ends are located in two adjacent layers in the radial direction of the stator core, and the slot outer ends of the plurality of U-shaped conductors located in the same layer in the radial direction of the stator core extend in the same direction in the circumferential direction of the stator core and have the same span in the circumferential direction;

[0021] The insides of the two slots are located in two radially adjacent layers of the stator core and separated by a specified slot pitch; the multi-slot interiors of the multiple U-shaped conductors of the second coil group are located in two radially adjacent layers of the stator core slots in sequence along the circumferential direction of the stator core.

[0022] Further, the plurality of U-shaped conductors of the first coil group include: a plurality of first U-shaped conductors, wherein the slot pitch of the outer slot turning portion of the plurality of first U-shaped conductors is a long pitch;

[0023] A plurality of second U-shaped conductors are provided, wherein the slot pitch of the outer slot turning portions of the plurality of second U-shaped conductors is a short pitch.

[0024] Furthermore, the slot pitch of the outer turning portions of the plurality of first U-shaped conductors is 7, and the slot pitch of the outer turning portions of the plurality of second U-shaped conductors is 5.

[0025] Furthermore, the slot pitch of the outer turning portions of the plurality of first U-shaped conductors is 10, and the slot pitch of the outer turning portions of the plurality of second U-shaped conductors is 7.

[0026] Furthermore, the slot pitch of the outer turning portions of the plurality of first U-shaped conductors is 11, and the slot pitch of the outer turning portions of the plurality of second U-shaped conductors is 8.

[0027] Furthermore, the slot pitch of the outer slot turning portions of the plurality of U-shaped conductors of the third coil group is a full pitch.

[0028] Furthermore, the slot pitch of the outer turning parts of the slots of the plurality of U-shaped conductors is 6.

[0029] Furthermore, the slot pitch of the outer turning parts of the slots of the plurality of U-shaped conductors is 9.

[0030] Furthermore, the slot pitch of the outer slot turning portions of the plurality of U-shaped conductors of the second coil group is the same as the slot pitch of the outer slot turning portions of the plurality of U-shaped conductors of the first coil group.

[0031] Furthermore, the slot pitch of the outer slot turning portions of the plurality of U-shaped conductors of the second coil group is the same as the slot pitch of the outer slot turning portions of the plurality of U-shaped conductors of the third coil group.

[0032] Furthermore, the turning portion of each U-shaped conductor of each coil group of the stator winding is located on one side of the outer end of the stator core slot, and the multiple slot outer ends of each U-shaped conductor of each coil group of the stator winding are located on the other side of the outer end of the stator core slot.

[0033] Furthermore, the outer ends of two radially adjacent slots in the stator winding extend in opposite directions in the circumferential direction.

[0034] Furthermore, the turning directions of the two outer-slot turning portions of the two U-shaped conductors in the adjacent slots of the same phase in the third coil group are opposite.

[0035] Furthermore, the turning directions of the two outer turning portions of the two U-shaped conductors in the same-phase adjacent slots in the first coil group are the same.

[0036] Furthermore, the first slot outer end portion and the second slot outer end portion of each U-shaped conductor of each coil group of the stator winding have extended ends. Except for the extended ends connected to the lead wires, the N-1 layer extended ends located in the same radial direction of the stator core and adjacent to each other are connected to the N layer extended ends, where N is an even number.

[0037] An embodiment of the present invention further provides a motor, comprising: a rotor and the motor stator described in any one of the above embodiments.

[0038] The motor stator in the technical solution of the embodiment of the present invention includes: a stator core, the stator core having a plurality of slots, the plurality of slots being 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, the stator winding being mounted on the stator core, the stator winding being three-phase, the stator winding having Q pole-pair coils, and Q / number of slots per pole per phase = P, where P is an integer, and the number of slots per pole per phase is greater than or equal to 2, and the stator windings of each phase are connected in series respectively. The stator windings between the phases are connected; the stator windings include: a first coil group and a third coil group arranged in sequence from the inside to the outside; the first coil group has a plurality of U-shaped conductors, the U-shaped conductors including: two slot outer ends, the two slot outer ends are located in the same radial layer of the stator core, the plurality of slot outer ends of the plurality of U-shaped conductors of the first coil group extend in the same direction in the circumferential direction of the stator core and have the same span in the circumferential direction; two slot interiors, the two slot interiors are located in the same radial layer of the stator core and The plurality of slots of the plurality of U-shaped conductors of the first coil group are sequentially located in the same radial layer of the stator core along the circumferential direction of the stator core; the third coil group comprises a plurality of U-shaped conductors, the U-shaped conductors comprising: two slot outer ends, the two slot outer ends being located in the same radial layer of the stator core, the plurality of slot outer ends of the plurality of U-shaped conductors of the third coil group extending in the same circumferential direction and having the same circumferential span; two slot inner portions, the two slot inner portions being located in the same radial layer of the stator core and separated by a predetermined slot distance; the plurality of slot inner portions of the plurality of U-shaped conductors of the third coil group being sequentially located in the same radial layer of the stator core along the circumferential direction; the number of types of coil units used is small, the arrangement is simple, the use of busbars and busbars can be reduced, the inconsistency between the twisting direction of the slot outer ends and the twisted slot spacing can be eliminated, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A diagram of a motor stator structure provided in Example 1 of the present invention;

[0040] Figure 2 A diagram showing the structure of a motor stator winding according to the first embodiment of the present invention;

[0041] Figure 3 A structural diagram of a first coil assembly 110 provided in Embodiment 1 of the present invention;

[0042] Figure 4 is a structural diagram of a U-shaped conductor 210 provided in the first embodiment of the present invention;

[0043] Figure 5 A structural diagram of a third coil assembly 130 provided in the first embodiment of the present invention;

[0044] Figure 6 is a structural diagram of a U-shaped conductor 230 provided in the first embodiment of the present invention;

[0045] Figure 7 A structural diagram of a second coil assembly 120 provided in the first embodiment of the present invention;

[0046] Figure 8 2 is a structural diagram of a U-shaped conductor 220A provided in the first embodiment of the present invention;

[0047] Figure 9 A structural diagram of another second coil assembly 120 provided in the first embodiment of the present invention;

[0048] Figure 10 This is a structural diagram of another U-shaped conductor 220B provided in the first embodiment of the present invention;

[0049] Figure 11 This is a structural diagram of two U-shaped conductors in adjacent slots in the same phase provided by the first embodiment of the present invention;

[0050] Figure 12 A structural diagram of one phase of a third coil assembly 130 provided in the first embodiment of the present invention;

[0051] Figure 13 A first-phase structure diagram of a first coil assembly 110 provided in the first embodiment of the present invention;

[0052] Figure 14 A diagram of a motor stator structure provided in the second embodiment of the present invention;

[0053] Figure 15 A schematic diagram of a flattened expansion of a single-phase stator winding of a motor stator winding provided by an embodiment of the present invention;

[0054] Figure 16 A diagram of a motor stator structure provided in the third embodiment of the present invention;

[0055] Figure 17 A diagram showing the structure of a motor stator winding according to a third embodiment of the present invention;

[0056] Figure 18 A structural diagram of a first coil assembly 110 provided in a third embodiment of the present invention;

[0057] Figure 19 A structural diagram of a U-shaped conductor 210 provided in a third embodiment of the present invention;

[0058] Figure 20 A structural diagram of a third coil assembly 130 provided in a third embodiment of the present invention;

[0059] Figure 21 A structural diagram of a U-shaped conductor 230 provided in the third embodiment of the present invention;

[0060] Figure 22 A structural diagram of a second coil assembly 120 provided in a third embodiment of the present invention;

[0061] Figure 23 A structural diagram of a U-shaped conductor 220B provided in the third embodiment of the present invention;

[0062] Figure 24 A structural diagram of another U-shaped conductor 210A provided in the third embodiment of the present invention;

[0063] Figure 25 A structural diagram of three adjacent U-shaped conductors in slots provided in a third embodiment of the present invention;

[0064] Figure 26 A structural diagram of one phase of a third coil assembly 130 provided in a third embodiment of the present invention;

[0065] Figure 27 A structural diagram of one phase of a first coil assembly 110 provided in a third embodiment of the present invention;

[0066] Figure 28 A schematic diagram of a flattened expansion of a single-phase stator winding of a motor stator winding provided in embodiment 3 of the present invention; DETAILED DESCRIPTION

[0067] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention, rather than limiting the present invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, rather than all structures.

[0068] The invention provides a motor stator. Figure 1 、 Figure 3 、 Figure 7 、 Figure 9 、 Figure 16 、 Figure 18 、 Figure 20 、 Figure 22In FIG. , 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 along the radial direction of the stator core drawn as examples.

[0069] like Figure 1 As shown, an embodiment of the present invention provides a motor stator, comprising: a stator core 20, wherein the stator core 20 has a plurality of slots 21, the plurality of slots 21 being formed on a radial inner surface of the stator core and spaced apart at a predetermined slot pitch along a circumferential direction of the stator core;

[0070] like Figures 1 to 2 As shown, the stator winding 10 is mounted on the stator core 20. The stator winding 10 is three-phase and has Q pole-pair coils, and Q / number of slots per pole per phase = P, where P is an integer and number of slots per pole per phase is greater than or equal to 2. Each phase stator winding is connected in series with each interphase stator winding.

[0071] Combine Figure 1-2 In this embodiment, 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 greater than or equal to 2;

[0072] In this embodiment, each magnetic pole of the rotor is provided with two slots 21. The rotor has eight magnetic poles, and this is the case for each phase of the three-phase stator winding 10. Each magnetic pole of the rotor corresponds to Q pole-pair coils of the stator winding. In this embodiment, Q is 4, 4 / 2=2. Accordingly, the number of slots 21 provided in the stator core 20 is equal to 48 (i.e., 2×8×3).

[0073] 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 stacking a plurality of annular magnetic steel plates to form two end faces 25 and 26 in the axial direction of the stator core, and 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 traditional metal plates can also be used instead of the magnetic steel plates.

[0074] For example, Figure 1-2 As shown, the stator winding includes: a first coil group 110 and a third coil group 130 which are sequentially arranged from the inside to the outside;

[0075] Combine Figure 1-2In this embodiment, the first coil group 110 is arranged in the radial inner layer of the stator core, that is, close to the radial inner surface of the stator core. In this embodiment, the first coil group 110 is located in the first radial layer of the stator core, and the third coil group 130 is arranged in the radial outer layer of the stator core, that is, away from the radial inner surface of the stator core. In this embodiment, the third coil group 130 is located in the fourth radial layer of the stator core; accordingly, the coil groups in the stator winding 10 can also be sequentially arranged from the outside to the inside, with the first coil group 110 being arranged in the radial outer layer of the stator core, that is, away from the radial inner surface of the stator core, and the third coil group 130 being arranged in the radial inner layer of the stator core, that is, close to the radial inner surface of the stator core.

[0076] like Figures 3 and 4 As shown, the first coil assembly 110 has a plurality of U-shaped conductors 210 (2101, 2102), each of the U-shaped conductors 210 (2101, 2102) including two slot outer ends 21031, the two slot outer ends 21031 being located at the same radial layer of the stator core 20, and the plurality of slot outer ends 21031 of the plurality of U-shaped conductors 210 (2101, 2102) extending in the same direction in the circumferential direction of the stator core and having the same span in the circumferential direction;

[0077] The two slot interiors 21011 are located in two slots 21 separated by a specified slot distance and located in the same radial layer of the stator core 20; the multiple slot interiors 21011 of the multiple U-shaped conductors 210 (2101, 2102) of the first coil assembly 110 are located in the same radial layer of the stator core 20 in sequence along the circumferential direction of the stator core;

[0078] Combine Figure 3 、 Figure 4 In this embodiment, the first coil group 110 includes 24 U-shaped conductors 210 (in this embodiment, the 24 U-shaped conductors 210 include 12 U-shaped conductors 2101 and 12 U-shaped conductors 2102). The U-shaped conductors 210 (2101, 2102) include: a slot outer end portion 21031, a slot inner portion 21011, a slot outer turning portion 21021, a slot inner portion 21011, and a slot outer end portion 21031 connected in sequence. 31, the two slot outer ends are respectively connected to the two slot inner parts 21011 located on the side of the stator core slot outer end 26 at the same layer. In this embodiment, the two slot outer ends 21031 of the U-shaped conductor 210 (2101, 2102) extend in the same direction in the circumferential direction of the stator core, both extending clockwise (rightward) and having the same span in the circumferential direction of the stator core. In this embodiment, the span extending in the circumferential direction of the stator core is 3 slot pitches, that is, 3d slot pitches.

[0079] The two slot interiors 21011 of the U-shaped conductor 210 (2101, 2102) are located in two slots separated by a specified slot pitch. The two slot interiors 21011 are located in the same radial layer of the stator core slot 21, that is, close to the radial inner surface of the stator core and located in the first layer of the stator core slot 21. Correspondingly, the slot outer ends 21031 are also located in the same radial layer of the stator core, that is, the first layer of the stator core 20. In this embodiment, the first coil group is located in the first radial layer of the stator core. Accordingly, the slot interiors 21011 and the slot outer ends 21031 of the first coil group are both located in the first radial layer of the stator core.

[0080] like Figure 5 、 Figure 6 As shown, the third coil group 130 has a plurality of U-shaped conductors 230 (2301), and the U-shaped conductors 230 (2301) include: two slot outer ends 21031, the two slot outer ends 21031 are located in the same radial layer of the stator core 20, and the slot outer ends 21031 of the plurality of U-shaped conductors 230 extend in the same direction in the circumferential direction of the stator core and have the same span in the circumferential direction; two slot inner portions 21011, the two slot inner portions 21011 are located in two slots 21 that are in the same radial layer of the stator core 20 and are separated by a specified slot distance; the plurality of slot inner portions 21011 of the plurality of U-shaped conductors 230 (2301) of the third coil group 230 (2301) are located in the same radial layer of the stator core 20 along the circumferential direction of the stator core;

[0081] Combine Figure 5 、 Figure 6 In this embodiment, the third coil group 130 includes 24 U-shaped conductors 230 (2301). The U-shaped conductors 230 (2301) include: a slot outer end portion 21031, a slot inner portion 21011, a slot outer turning portion 21021, a slot inner portion 21011, and a slot outer end portion 21031 connected in sequence. The two slot outer end portions 21031 are respectively connected to the two slot inner portions 21011 located on the side of the stator core slot outer end 26 in the same layer. In this embodiment, the two slot outer end portions 21031 of the U-shaped conductor 230 (2301) extend in the same direction in the circumferential direction of the stator core, both extend counterclockwise (to the left), and have the same span in the circumferential direction. In this embodiment, the span extending in the circumferential direction of the stator core is 3 slot pitches, that is, 3d slot pitches.

[0082] The two slot interiors 21011 of the U-shaped conductor 230 (2301) are located in two slots separated by a specified slot pitch, and the two slot interiors 21011 are located in the same radial layer of the stator core slot 21, that is, close to the radial inner surface of the stator core, and located in the Nth layer in the stator core slot 21. Correspondingly, the slot outer ends 21031 are also located in the same radial layer of the stator core, that is, located in the Nth layer of the stator core slot. In this embodiment, the third coil group is located in the fourth radial layer of the stator core. Accordingly, the slot interiors 21011 and the slot outer ends 21031 in the third coil group are both located in the fourth radial layer of the stator core. By using fewer types of coil units and a simple arrangement method, the use of bus bars and busbars can be reduced, and the inconsistency between the twisting direction of the slot outer ends and the twisted slot spacing can be eliminated, so that the branches and neutral points of each phase winding are set in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0083] For example, Figure 2-6 As shown, the plurality of U-shaped conductors 210 (2101, 2102) of the first coil group 110 further include: an outer slot turning portion 21021, the outer slot turning portion 21021 being located on the slot outer end 25 side of the stator core 20, connecting the two slot inner portions 21011 of the plurality of U-shaped conductors 210 (2101, 2102) of the first coil group 110; the plurality of U-shaped conductors 230 (2301) of the third coil group 130 further include: an outer slot turning portion 21021 1021, the slot outer turning portion 21021 is located on the slot outer end 25 side of the stator core 20, connecting the two slot inner portions 21011 of the multiple U-shaped conductors 230 (2301) of the third coil group 130; the slot pitch of the slot outer turning portion 21021 of the multiple U-shaped conductors 210 (2101, 2102) of the first coil group 110 is different from that of the slot outer turning portion 21021 of the multiple U-shaped conductors 230 (2301) of the third coil group 130.

[0084] Combine Figures 2 to 6In this embodiment, the 24 U-shaped conductors 210 (2101, 2102) of the first coil group 110 further include: an outer slot turn portion 21021, which is located on the slot outer end 25 side of the stator core 20 and connects the corresponding two slot inner portions 21011. Furthermore, the slot pitch between the two slot inner portions 21011 of 12 U-shaped conductors 2101 among the 24 U-shaped conductors 210 is X (X is 7 in this embodiment). Accordingly, the slot pitch of the outer slot turn portion 21021 connecting the two slot inner portions 21011 of the U-shaped conductor 2101 is X (X is 7 in this embodiment). The slot pitch between the two slot inner portions 21011 of 12 U-shaped conductors 2102 among the 24 U-shaped conductors 210 is Y (Y is 5 in this embodiment). Accordingly, the slot pitch between the two slot inner portions 21011 of the U-shaped conductor 2102 is Y ( In this embodiment, Y is 5); the 24 U-shaped conductors 230 (2301) of the third coil group 130 further include: an outer slot turn portion 21021, which is located on the side of the outer slot end 25 of the stator core 20 and connects the corresponding two slot inner portions 21011. Further, the slot pitch between the two slot inner portions 21011 of the 24 U-shaped conductors 230 (2301) is Z (Z is 6 in this embodiment), and accordingly, the slot pitch of the outer slot turn portion 21021 connecting the two slot inner portions 21011 of the U-shaped conductor 230 (2301) is Z (Z is 6 in this embodiment); that is, the slot pitch of the outer slot turn portion 21021 of the 24 U-shaped conductors 210 (2101, 2102) of the first coil group 110 is different from the slot pitch of the outer slot turn portion 21021 of the 24 U-shaped conductors 230 of the third coil group 130.

[0085] For example, Figure 2 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 As shown, the second coil group 120 is further provided between the first coil group 110 and the third coil group 130. The second coil group 120 includes a plurality of U-shaped conductors 220A (or 220B). The U-shaped conductors 220A (220B) include: two slot outer ends 21031, the two slot outer ends 21031 are located in two radially adjacent layers of the stator core 20, and the slot outer ends 21031 of the plurality of U-shaped conductors 220A (220B) located in the same radial layer of the stator core 20 extend in the same direction in the circumferential direction of the stator core and have the same span in the circumferential direction; two slot inner portions 21011, the two slot inner portions 21011 are located in two slots 21 that are radially adjacent to each other in the stator core slots 21 and are separated by a predetermined slot distance. The plurality of slot inner portions 21011 of the plurality of U-shaped conductors 220A (or 220B) of the second coil group 120 are sequentially located in two radially adjacent layers in the stator core slots 21 along the circumferential direction of the stator core.

[0086] Optionally, based on the above embodiment, Figure 2 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 As shown, the stator winding 10 further includes a second coil group 120 disposed between the first coil group 110 and the third coil group 130. Figure 7 、 Figure 8 In this embodiment, the second coil group 120 includes 48 U-shaped conductors 220A (220B), and the U-shaped conductor 220A (220B) includes: a slot outer end portion 21031, a slot inner portion 21011, a slot outer turning portion 21021, a slot inner portion 21011, and a slot outer end portion 21031 connected in sequence. The two slot outer ends are respectively connected to the two slot inner portions 21011 located on the side of the stator core slot outer end 26 in the same layer. In this embodiment, the U-shaped conductor 220A (2201, 2202) or 220B (2201) The two slot outer ends 21031 extend in opposite directions in the circumferential direction of the stator core. The slot outer ends 21031 located in the same radial layer of the stator core extend counterclockwise (to the right) and have the same span in the circumferential direction. In this embodiment, the span extending in the circumferential direction of the stator core is 3 slot pitches, that is, 3d slot pitches; the other slot outer ends 21031 located in the same radial layer of the stator core extend clockwise (to the left) and have the same span extending in the circumferential direction; in this embodiment, the span extending in the circumferential direction of the stator core is 3 slot pitches, that is, 3d slot pitches.

[0087] The two slot interiors 21011 of the U-shaped conductor 220A (220B) are located in two slots 21 separated by a specified slot pitch. The two slot interiors 21011 are located in two radially adjacent layers within the stator core slot 21, that is, on the side close to the radial inner surface of the stator core, and are located in the radially adjacent (N-1) and (N-2) layers of the stator core 20. Correspondingly, the slot outer ends 21031 are also located in two radially adjacent layers of the stator core 20, that is, the (N-1) and (N-2) layers. In this embodiment, the second coil group is located in the second layer of the third radially adjacent layer of the stator core. Accordingly, the slot interiors 21011 and the slot outer ends 21031 in the second coil group are both located in the second layer of the third radially adjacent layer of the stator core.

[0088] The multiple U-shaped conductors of the first coil group include: multiple first U-shaped conductors, the slot pitch of the multiple first U-shaped conductors at the slot outer turn parts is a long pitch; multiple second U-shaped conductors, the slot pitch of the multiple second U-shaped conductors at the slot outer turn parts is a short pitch; the slot pitch of the multiple first U-shaped conductors at the slot outer turn parts is 7, and the slot pitch of the multiple second U-shaped conductors at the slot outer turn parts is 5.

[0089] For example, Figure 3 、 Figure 4As shown, the multiple U-shaped conductors 210 of the first coil group 110 include: multiple first U-shaped conductors 2101, each having a slot pitch of X (X is 7 in this embodiment) at the outer turn portion 21021 of the slot; and multiple second U-shaped conductors 2102, each having a slot pitch of Y (Y is 5 in this embodiment). In this embodiment, a U-shaped conductor having a slot pitch of 6 between two slots is a full pitch. A U-shaped conductor having a slot pitch greater than 6 is a long pitch, and a U-shaped conductor having a slot pitch less than 6 is a short pitch. Therefore, in this embodiment, the slot pitch of the outer turn portion of the slot of the multiple first U-shaped conductors 2101 is a long pitch, and the slot pitch of the outer turn portion of the slot of the multiple second U-shaped conductors 2102 is a short pitch.

[0090] Combine Figure 3 、 Figure 4 The first coil group 110 includes: 24 U-shaped conductors 210 (2101, 2102)

[0091] Furthermore, the 24 U-shaped conductors 210 include 12 first U-shaped conductors 2101, and the slot pitch between two slot interiors 21011 of the 12 first U-shaped conductors 2101 is X (X is 7 in this embodiment). Accordingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot interiors 21011 of the first U-shaped conductors 2101 is X (X is 7 in this embodiment); the 24 U-shaped conductors 210 also include 12 second U-shaped conductors 2102, and the slot pitch between two slot interiors of the 12 second U-shaped conductors 2102 is Y (Y is 5 in this embodiment). Accordingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot interiors 21011 of the first U-shaped conductors 2101 is X (X is 7 in this embodiment). The slot pitch between the two slot interiors 21011 of the U-shaped conductor 2102 is Y (Y is 5 in this embodiment); the slot pitch of the slot outer turning portion 21021 of the multiple second U-shaped conductors is Y (Y is 5 in this embodiment). In this embodiment, the U-shaped conductor with a slot pitch of 6 between the two slot interiors is a full pitch, the slot pitch of the U-shaped conductor is greater than 6, which is a long pitch, and the slot pitch of the U-shaped conductor is less than 6, which is a short pitch. It can be seen that in this embodiment, the slot pitch inside the slots of the multiple first U-shaped conductors 2101 is a long pitch, and the slot pitch inside the slots of the multiple second U-shaped conductors 2102 is a short pitch.

[0092] Optional, such as Figure 5 、 Figure 6 As shown, the slot pitch of the outer slot turning portion 21021 of the multiple U-shaped conductors 230 (2301) of the third coil group 130 is Z (Z is 6 in this embodiment), and the slot pitch of the outer slot turning portion of the multiple U-shaped conductors of the third coil group is a full pitch.

[0093] Optionally, based on the above embodiment, Figure 5 、 Figure 6As shown, in this embodiment, the third coil group 130 includes: 24 U-shaped conductors 230 (2301)

[0094] Furthermore, the 24 U-shaped conductors 230 include 24 U-shaped conductors 2301, and the slot pitch between two slot interiors 21011 of the 24 U-shaped conductors 2301 is Z (Z is 6 in this embodiment). Correspondingly, the slot pitch of the slot outer turn portion 21021 connecting the two slot interiors 21011 of the U-shaped conductor 2301 is Z (Z is 6 in this embodiment); in this embodiment, the slot pitch of the U-shaped conductor with a slot pitch of 6 between two slot interiors is a full pitch, which shows that the slot pitch of the slot outer turn portion of multiple U-shaped conductors 2301 in this embodiment is a full pitch.

[0095] Optional, such as Figure 4 、 Figure 8 As shown, the slot pitch of the outer slot turning portions 21021 of the plurality of U-shaped conductors 220A ( 2201 , 2202 ) of the second coil assembly 120 is the same as the slot pitch of the outer slot turning portions of the plurality of U-shaped conductors 210 ( 2101 , 2102 ) of the first coil assembly 110 .

[0096] Optionally, based on the above embodiment, Figure 4 、 Figure 8 The slot pitch between two slots 21011 of 12 of the 24 U-shaped conductors 210 (2101, 2102) of the first coil group 110 is X (X is 7 in this embodiment). Accordingly, the slot pitch of the outer slot turning portion 21021 connecting the two slots 21011 of the U-shaped conductor 2101 is X (X is 7 in this embodiment). The slot pitch between two slots of 12 of the 24 U-shaped conductors 2102 is Y (Y is 5 in this embodiment). Accordingly, the slot pitch between two slots 21011 of the U-shaped conductor 2102 is Y (Y is 5 in this embodiment). The slot pitch between two slots of 24 of the 48 U-shaped conductors 220A (2201, 2202) of the second coil group 120 is Y (Y is 5 in this embodiment). The slot pitch between the two slot interiors 21011 of the U-shaped conductor 2201 is X (X is 7 in this embodiment). Correspondingly, the slot pitch of the outer slot turn portion 21021 connecting the two slot interiors 21011 of the U-shaped conductor 2201 is X (X is 7 in this embodiment). The slot pitch between the two slot interiors of the 24 U-shaped conductors 2102 in the 48 U-shaped conductors 220A is Y (Y is 5 in this embodiment). Correspondingly, the slot pitch between the two slot interiors 21011 of the U-shaped conductor 2102 is Y (Y is 5 in this embodiment). Therefore, it can be seen that in this embodiment, the slot pitch of the outer slot turn portions 21021 of the 48 U-shaped conductors 220A (2201, 2202) of the second coil 120 is the same as the slot pitch of the outer slot turn portions of the 24 U-shaped conductors 210 (2201, 2202) of the first coil assembly 110.

[0097] Optional, such as Figure 6 、 Figure 10 As shown, the slot pitch of the outer slot turning portion 21021 of the plurality of U-shaped conductors 220B ( 2201 ) of the second coil group 120 is the same as the slot pitch of the outer slot turning portion 21021 of the plurality of U-shaped conductors 230 ( 2301 ) of the third coil group 130 .

[0098] Optionally, based on the above embodiment, Figure 6 、 Figure 10 The slot pitch between the two slot interiors 21011 of the 24 U-shaped conductors 230 (2301) of the third coil group 130 is Z (Z is 6 in this embodiment). Correspondingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot interiors 21011 of the U-shaped conductor 2301 is Z (Z is 6 in this embodiment); the slot pitch between the two slot interiors 21011 of the 48 U-shaped conductors 220B (2201) of the second coil group 120 is is Z (Z is 6 in this embodiment), and accordingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot inner portions 21011 of the U-shaped conductor 2201 is Z (Z is 6 in this embodiment); it can be seen that, in this embodiment, the slot outer turning portions 21021 of the 48 U-shaped conductors 220B (2201) of the second coil 120 have the same slot pitch as the slot outer turning portions of the 24 U-shaped conductors 230 (2301) of the third coil group 130.

[0099] For example, Figure 1-10 As shown, the turning portion 21021 of each U-shaped conductor of each coil group of the stator winding 10 is located on one side of the slot outer end 25 of the stator core 20, and the multiple slot outer end portions 21031 of each U-shaped conductor of each coil group of the stator winding 10 are located on the other side of the slot outer end 26 of the stator core 20.

[0100] Optionally, based on the above embodiment, Figures 1 to 11 In this embodiment, the turn portion 21021 of each U-shaped conductor in the first coil group 110 of the stator winding 10 is located on one side of the slot outer end 25 of the stator core 20, and the turn portion 21021 of each U-shaped conductor in the third coil group 130 of the stator winding is located on one side of the slot outer end 25 of the stator core 20; the multiple slot outer ends 21031 of each U-shaped conductor in the first coil group 110 of the stator winding 10 are located on the other side of the slot outer end 26 of the stator core 20, the multiple slot outer ends 21031 of each U-shaped conductor in the second coil group 120 of the stator winding 10 are located on the other side of the axial direction 26 of the stator core 20, and the multiple slot outer ends 21031 of each U-shaped conductor in the third coil group 130 of the stator winding 10 are located on the other side of the axial direction 26 of the stator core 20;

[0101] Furthermore, if Figures 7 to 10 As shown, in this embodiment, the stator winding further includes a turn portion 21021 of each U-shaped conductor in the second coil group 120 located on one side of the slot outer end 25 of the stator core 20, and multiple slot outer ends 21031 of each U-shaped conductor in the second coil group 120 in the stator winding 10 are located on the other side of the axial direction 26 of the stator core 20;

[0102] For example, Figure 1-10 As shown, the circumferential extension directions of two radially adjacent slot outer ends 21031 in the stator winding 10 are opposite.

[0103] Optionally, based on the above embodiment, Figures 3 and 4 All slot outer ends 21031 of the first coil group 110 in the stator winding 10 extend in the same direction in the circumferential direction of the stator core, all extending clockwise (leftward). Figure 5 、 Figure 6 , all slot outer ends 21031 of the third coil group 130 extend in the same direction in the circumferential direction of the stator core and extend counterclockwise (rightward). The extending direction of all slot outer ends of the first coil group 110 in the circumferential direction of the stator core is opposite to the extending direction of all slot outer ends of the third coil group 130 in the circumferential direction of the stator core. Optionally, combined with Figure 7 、 Figure 8 The ends of the second coil group 120 in the stator winding 10 located outside the slots of the stator core in the radial direction of layer N-2 extend in the same counterclockwise (rightward) direction in the circumferential direction of the stator core. The ends of the second coil group 120 located outside the slots of the stator core in the radial direction of layer N-1 extend in the same counterclockwise (rightward) direction in the circumferential direction of the stator core.

[0104] Combine Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 The slot outer end 21031 of the first coil group 110 in the stator winding is located in the first radial layer of the stator core 20 and extends to the left in the circumferential direction of the stator core. The first slot outer end 21031 of the second coil group 120 is located in the second radial layer of the stator core 20 and extends to the right in the circumferential direction of the stator core. The second slot outer end 21031 of the second coil group 120 is located in the third radial layer of the stator core 20 and extends to the left in the circumferential direction of the stator core. The slot outer end 21031 of the third coil group 130 is located in the fourth radial layer of the stator core 20 and extends to the right in the circumferential direction of the stator core. It can be seen that the extension directions of the two adjacent slot outer ends 21031 in the stator core 20 in the circumferential direction of the stator core are opposite.

[0105] For example, Figure 6As shown, the turning directions of the two outer-slot turning portions 21021 of the two U-shaped conductors 230 in the adjacent slots of the same phase in the third coil group 130 are opposite.

[0106] Optionally, based on the above embodiment, Figure 6 The third coil group 130 includes a U-phase coil group, a V-phase coil group, and a W-phase coil group. The U-phase coil group in the third coil group 130 is described as an example. Figure 6 、 Figure 11 、 Figure 12 The first slot of the U-shaped conductor 230-1 (i.e., U1) is located in the first slot of the stator core 20, and the second slot of the U-shaped conductor 230-1 is located in the forty-third slot of the stator core 20, that is, the turning direction of the slot outer turn portion 21021 connecting the two slots of the U-shaped conductor 230-1 is clockwise (i.e., leftward); further, the first slot of the U-shaped conductor 230-2 (i.e., U2) in the adjacent slot is located in the second slot of the stator core 20, and the second slot of the U-shaped conductor 230-2 is located in the eighth slot of the stator core 20, that is, the turning direction of the slot outer turn portion 21021 connecting the two slots of the U-shaped conductor 230-2 is counterclockwise (i.e., rightward). It can be seen that the turning directions of the two slot outer turn portions 21021 of the two U-shaped conductors 230-1 and 230-2 in adjacent slots 21 of the same phase in the third coil group 130 are opposite.

[0107] For example, Figure 4 As shown, the turning directions of the two outer-slot turning portions 21021 of the two U-shaped conductors 210 in the adjacent slots of the same phase in the first coil group 110 are the same.

[0108] Optionally, based on the above embodiment, Figure 4 The first coil group 110 includes a U-phase coil group, a V-phase coil group, and a W-phase coil group. The U-phase coil group in the first coil group 110 is now described as an example. Figure 4 、 Figure 11 、 Figure 13The interior of the first slot of the U-shaped conductor 2101 (i.e., U1) is located in the first slot of the stator core 20, and the interior of the second slot of the U-shaped conductor 2102 is located in the eighth slot of the stator core 20, that is, the turning direction of the slot outer turn portion 21021 connecting the two slot interiors of the U-shaped conductor 2101 is counterclockwise (i.e., rightward); further, the interior of the first slot 21011 of the U-shaped conductor 2102 (i.e., U2) of the adjacent slot is located in the second slot of the stator core 20, and the interior of the second slot of the U-shaped conductor 2102 is located in the seventh slot of the stator core 20, that is, the turning direction of the slot outer turn portion 21021 connecting the two slot interiors of the U-shaped conductor 2102 is counterclockwise (i.e., rightward). It can be seen that the turning directions of the two slot outer turn portions 21021 of the two U-shaped conductors 2101 and 2102 in adjacent slots 21 of the same phase in the first coil group 110 are the same.

[0109] For example, Figure 1-11 As shown, the first slot outer end portion 21031 and the second slot outer end portion 21031 have an extension end 5. In addition to the extension end connected to the lead-out lead wire 4, the N-1 layer extension end 5 located in the same radial direction of the stator core and adjacent to each other is connected to the N layer extension end 5, where N is an even number.

[0110] Optionally, based on the above embodiment, Figures 1 to 14 As shown, in this embodiment, the first slot outer end portion 21031 and the second slot outer end portion 21031 both have an extended end 5. Except for the extended end 5 connected to the lead wire 4 (the lead wires of each embodiment of the present invention include terminals and neutral points of each phase, i.e., U-phase terminal, V-phase terminal, W-phase terminal, U-phase neutral point, V-phase neutral point, and W-phase neutral point), the remaining first-layer extended ends and second-layer extended ends located in the same radial direction and adjacent to the stator core are connected, and the third-layer extended ends and fourth-layer extended ends located in the same radial direction and adjacent to the stator core are connected. Furthermore, the extended ends of the two connected slot outer ends in the stator winding are both located in the radially adjacent odd and even layers of the stator core. In this embodiment, the positions of the extended end 5 connected to the terminal and the extended end 5 connected to the neutral point in the lead wire 4 can be interchanged, i.e., this embodiment does not limit the positions of the terminals and neutral points in the lead wires.

[0111] The present invention further provides an embodiment, embodiment 3, as shown in FIG. Figure 16 As shown, an embodiment of the present invention provides a motor stator, comprising: a stator core 20, wherein the stator core 20 has a plurality of slots 21, the plurality of slots 21 being formed on a radial inner surface of the stator core and spaced apart at a predetermined slot pitch along a circumferential direction of the stator core;

[0112] like Figures 16 and 17As shown, the stator winding 10 is mounted on the stator core 20. The stator winding 10 is three-phase and has Q pole-pair coils, and Q / number of slots per pole per phase = P, where P is an integer and number of slots per pole per phase is greater than or equal to 2. Each phase stator winding is connected in series with each interphase stator winding.

[0113] Combine Figure 16 、 Figure 17 In this embodiment, 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 greater than or equal to 2;

[0114] In this embodiment, each magnetic pole of the rotor is provided with three slots 21. In this embodiment, the number of slots per pole per phase is 3. The rotor has twelve magnetic poles and this is the case for each phase of the three-phase stator winding 10. The rotor corresponds to Q pole-pair coils of the stator winding. In this embodiment, Q is 6, 6 / 3=2. Correspondingly, the number of slots 21 provided in the stator core 20 is equal to 108 (i.e., 3×12×3).

[0115] 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 stacking a plurality of annular magnetic steel plates to form two end faces 25 and 26 in the axial direction of the stator core, and 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 traditional metal plates can also be used instead of the magnetic steel plates.

[0116] For example, as shown in FIG. 16, Figure 17 As shown, the stator winding includes: a first coil group 110 and a third coil group 130 which are sequentially arranged from the inside to the outside;

[0117] Combine Figure 16 、 Figure 17 In this embodiment, the first coil group 110 is arranged in the radial inner layer of the stator core, that is, away from the radial inner surface of the stator core. In this embodiment, the first coil group 110 is located in the first radial layer of the stator core, and the third coil group 130 is arranged in the radial outer layer of the stator core, that is, close to the radial inner surface of the stator core. In this embodiment, the third coil group 130 is located in the sixth radial layer of the stator core; accordingly, the coil groups in the stator winding 10 can also be sequentially arranged from the inside to the outside, with the first coil group 110 being arranged in the radial inner layer of the stator core, that is, close to the radial inner surface of the stator core, and the third coil group 130 being arranged in the radial inner layer of the stator core, that is, away from the radial inner surface of the stator core.

[0118] like Figures 18 and 19As shown, the first coil assembly 110 has a plurality of U-shaped conductors 210 (2101, 2102), each of the U-shaped conductors 210 (2101, 2102) including two slot outer ends 21031, the two slot outer ends 21031 being located at the same radial layer of the stator core 20, and the plurality of slot outer ends 21031 of the plurality of U-shaped conductors 210 (2101, 2102) extending in the same direction in the circumferential direction of the stator core and having the same span in the circumferential direction;

[0119] The two slot interiors 21011 are located in two slots 21 separated by a specified slot distance and located in the same radial layer of the stator core 20; the multiple slot interiors 21011 of the multiple U-shaped conductors 210 (2101, 2102) of the first coil assembly 110 are located in the same radial layer of the stator core 20 in sequence along the circumferential direction of the stator core;

[0120] Combine Figure 18 、 Figure 19 In this embodiment, the first coil group 110 includes 54 U-shaped conductors 210 (in this embodiment, the 54 U-shaped conductors 210 include 36 U-shaped conductors 2101 and 18 U-shaped conductors 2102). The U-shaped conductors 210 (2101, 2102) include: a slot outer end portion 21031, a slot inner portion 21011, a slot outer turning portion 21021, a slot inner portion 21011, and a slot outer end portion 21031 connected in sequence. The two slot outer ends are respectively connected to the two slot inner parts 21011 located on the side of the stator core slot outer end 26 at the same layer. In this embodiment, the two slot outer ends 21031 of the U-shaped conductor 210 (2101, 2102) extend in the same direction in the circumferential direction of the stator core, both extending counterclockwise (to the left) and having the same span in the circumferential direction of the stator core. In this embodiment, the span extending in the circumferential direction of the stator core is 4.5 slot pitches, that is, 4.5d slot pitches.

[0121] The two slot interiors 21011 of the U-shaped conductor 210 (2101, 2102) are located in two slots separated by a specified slot pitch. The two slot interiors 21011 are located in the same radial layer of the stator core slot 21, that is, away from the radial inner surface of the stator core, and are located in the first layer of the stator core slot 21. Correspondingly, the slot outer ends 21031 are also located in the same radial layer of the stator core, that is, the first layer of the stator core 20. In this embodiment, the first coil group is located in the first radial layer of the stator core. Accordingly, the slot interiors 21011 and the slot outer ends 21031 of the first coil group are both located in the first radial layer of the stator core.

[0122] like Figure 20 、 Figure 21As shown, the third coil group 130 has a plurality of U-shaped conductors 230 (2301), and the U-shaped conductors 230 (2301) include: two slot outer ends 21031, the two slot outer ends 21031 are located in the same radial layer of the stator core 20, and the slot outer ends 21031 of the plurality of U-shaped conductors 230 have the same extension direction in the circumferential direction of the stator core and the same span in the circumferential direction; two slot inner portions 21011, the two slot inner portions 21011 are located in two slots 21 separated by a specified slot distance in the same radial layer of the stator core 20; the plurality of slot inner portions 21011 of the plurality of U-shaped conductors 230 (2301) of the third coil group 230 (2301) are located in the same radial layer of the stator core 20 along the circumferential direction of the stator core;

[0123] Combine Figure 20 、 Figure 21 In this embodiment, the third coil group 130 includes 54 U-shaped conductors 230 (2301). The U-shaped conductors 230 (2301) include: a slot outer end portion 21031, a slot inner portion 21011, a slot outer turning portion 21021, a slot inner portion 21011, and a slot outer end portion 21031 connected in sequence. The two slot outer end portions 21031 are respectively connected to the two slot inner portions 21011 located on the side of the stator core slot outer end 26 on the same layer. In this embodiment, the two slot outer end portions 21031 of the U-shaped conductor 230 (2301) extend in the same direction in the circumferential direction of the stator core, both extend clockwise (rightward), and have the same span in the circumferential direction. In this embodiment, the span in the circumferential direction of the stator core is 4.5 slot pitches, that is, 4.5d slot pitches.

[0124] The two slot interiors 21011 of the U-shaped conductor 230 (2301) are located in two slots separated by a specified slot pitch. The two slot interiors 21011 are located in the same radial layer of the stator core slot 21, that is, away from the radial inner surface of the stator core, and are located in the Nth layer in the stator core slot 21. Correspondingly, the slot outer ends 21031 are also located in the same radial layer of the stator core, that is, located in the Nth layer of the stator core slot. In this embodiment, the third coil group is located in the sixth radial layer of the stator core. Correspondingly, the slot interiors 21011 and the slot outer ends 21031 in the third coil group are both located in the sixth radial layer of the stator core. By using fewer types of coil units and a simple arrangement, the use of bus bars and busbars can be reduced, and the inconsistency of the twisting direction of the slot outer ends and the twisted slot spacing can be eliminated, so that the branches and neutral points of each phase winding are set in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0125] For example, Figures 16 to 21As shown, the plurality of U-shaped conductors 210 (2101, 2102) of the first coil group 110 further include: an outer slot turning portion 21021, the outer slot turning portion 21021 being located on the slot outer end 25 side of the stator core 20, connecting the two slot inner portions 21011 of the plurality of U-shaped conductors 210 (2101, 2102) of the first coil group 110; the plurality of U-shaped conductors 230 (2301) of the third coil group 130 further include: an outer slot turning portion 21021 1021, the slot outer turning portion 21021 is located on the slot outer end 25 side of the stator core 20, connecting the two slot inner portions 21011 of the multiple U-shaped conductors 230 (2301) of the third coil group 130; the slot pitch of the slot outer turning portion 21021 of the multiple U-shaped conductors 210 (2101, 2102) of the first coil group 110 is different from that of the slot outer turning portion 21021 of the multiple U-shaped conductors 230 (2301) of the third coil group 130.

[0126] Combine Figures 17 to 21 In this embodiment, the 54 U-shaped conductors 210 (2101, 2102) of the first coil group 110 further include: an outer slot turn portion 21021, which is located on the slot outer end 25 side of the stator core 20 and connects the corresponding two slot inner portions 21011. Furthermore, the slot pitch between the two slot inner portions 21011 of 36 U-shaped conductors 2101 among the 54 U-shaped conductors 210 is X (X is 10 in this embodiment). Accordingly, the slot pitch of the outer slot turn portion 21021 connecting the two slot inner portions 21011 of the U-shaped conductor 2101 is X (X is 10 in this embodiment). The slot pitch between the two slot inner portions of 16 U-shaped conductors 2102 among the 54 U-shaped conductors 210 is Y (Y is 7 in this embodiment). Accordingly, the slot pitch between the two slot inner portions 2101 of the U-shaped conductor 2102 is Y (Y is 7 in this embodiment). 1 is Y (Y is 7 in this embodiment); the 54 U-shaped conductors 230 (2301) of the third coil group 130 further include: an outer slot turn portion 21021, the outer slot turn portion 21021 is located on the side of the outer slot end 25 of the stator core 20 and connects the corresponding two slot inner portions 21011. Further, the slot pitch between the two slot inner portions 21011 of the 54 U-shaped conductors 230 (2301) is 9, and accordingly, the slot pitch of the outer slot turn portion 21021 connecting the two slot inner portions 21011 of the U-shaped conductor 230 (2301) is 9; that is, the slot pitch of the outer slot turn portion 21021 of the 54 U-shaped conductors 210 (2101, 2102) of the first coil group 110 is different from the slot pitch of the outer slot turn portion 21021 of the 54 U-shaped conductors 230 of the third coil group 130.

[0127] For example, Figure 17 、 Figure 22 、 Figure 23 、 Figure 24 、 Figure 25As shown, the second coil group 120 is further provided between the first coil group 110 and the third coil group 130. The second coil group 120 includes a plurality of U-shaped conductors 220A (or 220B). The U-shaped conductors 220A (220B) include: two slot outer ends 21031, the two slot outer ends 21031 are located in two radially adjacent layers of the stator core 20, and the slot outer ends 21031 of the plurality of U-shaped conductors 220A (220B) located in the same radial layer of the stator core 20 extend in the same direction in the circumferential direction of the stator core and have the same span in the circumferential direction; two slot inner portions 21011, the two slot inner portions 21011 are located in two slots 21 that are radially adjacent to each other in the stator core slots 21 and are separated by a predetermined slot distance. The plurality of slot inner portions 21011 of the plurality of U-shaped conductors 220A (or 220B) of the second coil group 120 are sequentially located in two radially adjacent layers in the stator core slots 21 along the circumferential direction of the stator core.

[0128] Optionally, based on the above embodiment, Figure 17 、 Figure 22 、 Figure 23 、 Figure 24 、 Figure 25 As shown, the stator winding 10 further includes a second coil group 120 disposed between the first coil group 110 and the third coil group 130. Figure 22 、 Figure 23 In this embodiment, the second coil group 120 includes 108 U-shaped conductors 220A (220B). The U-shaped conductor 220A (220B) includes: a slot outer end portion 21031, a slot inner portion 21011, a slot outer turning portion 21021, a slot inner portion 21011, and a slot outer end portion 21031 connected in sequence. The two slot outer ends are respectively connected to the two slot inner portions 21011 located on the side of the stator core slot outer end 26 in the same layer. In this embodiment, the two slots of the U-shaped conductor 220A (2201, 2202) or 220B (2201) The outer end portions 21031 extend in opposite directions in the circumferential direction of the stator core. The outer end portions 21031 of a slot located in the same radial layer of the stator core extend clockwise (to the left) and have the same span in the circumferential direction. In this embodiment, the span extending in the circumferential direction of the stator core is 4.5 slot pitches, that is, 4.5d slot pitches; the outer end portions 21031 of another slot located in the same radial layer of the stator core extend counterclockwise (to the right) and have the same span extending in the circumferential direction. In this embodiment, the span extending in the circumferential direction of the stator core is 4.5 slot pitches, that is, 4.5d slot pitches.

[0129] The two slot interiors 21011 of the U-shaped conductor 220A (220B) are located in two slots 21 separated by a specified slot pitch. The two slot interiors 21011 are located in two radially adjacent layers within the stator core slot 21, that is, on the side away from the radial inner surface of the stator core, and are located in the radially N-1 and N-2 layers of the stator core 20. Correspondingly, the slot outer ends 21031 are also located in two radially adjacent layers of the stator core 20, that is, the N-1 and N-2 layers. In this embodiment, the second coil group is located in the second layer of the third radially adjacent layer of the stator core. Accordingly, the slot interiors 21011 and the slot outer ends 21031 in the second coil group are both located in the second layer of the third radially adjacent layer of the stator core.

[0130] For example, Figure 18 、 Figure 19 As shown, the first coil group 110 includes: a plurality of first U-shaped conductors 2101, wherein the slot pitch of the outer turning portion 21021 of the first U-shaped conductor is a long pitch; and a plurality of second U-shaped conductors 2102, wherein the slot pitch of the outer turning portion 21021 of the second U-shaped conductor is a short pitch.

[0131] Combine Figure 18 、 Figure 19 The first coil assembly 110 includes: 54 U-shaped conductors 210 (2101, 2102). Further, the 54 U-shaped conductors 210 include 36 first U-shaped conductors 2101, and the slot pitch between two slot interiors 21011 of the 36 first U-shaped conductors 2101 is X (X is 10 in this embodiment). Accordingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot interiors 21011 of the first U-shaped conductors 2101 is X (X is 10 in this embodiment); the 54 U-shaped conductors 210 also include 18 second U-shaped conductors 2102, and the slot pitch between two slot interiors of the 18 second U-shaped conductors 2102 is Y (Y in this embodiment). is 7), accordingly, the slot pitch between the two slot interiors 21011 connecting the second U-shaped conductor 2102 is Y (Y is 7 in this embodiment); in this embodiment, a U-shaped conductor with a slot pitch of 9 between the two slot interiors is a full pitch, a U-shaped conductor with a slot pitch greater than 9 is a long pitch, and a U-shaped conductor with a slot pitch less than 9 is a short pitch. It can be seen that in this embodiment, the first coil group 110 includes 36 first U-shaped conductors 2101, the slot pitch between the two slot interiors 21011 of the U-shaped conductor 2101 is a long pitch, and 18 second U-shaped conductors 2102, the slot pitch between the two slot interiors 21011 of the U-shaped conductor 2102 is a short pitch.

[0132] Optional, such as Figure 20 、 Figure 21 As shown, the slot pitch of the outer slot turning portion 21021 of the plurality of U-shaped conductors 230 ( 2301 ) of the third coil assembly 130 is a full pitch.

[0133] Optionally, based on the above embodiment, Figure 20 、 Figure 21 As shown, in this embodiment, the third coil group 130 includes: 54 U-shaped conductors 230 (2301)

[0134] Furthermore, the 54 U-shaped conductors 230 include 54 U-shaped conductors 2301, and the slot pitch between the two slot interiors 21011 of the 54 U-shaped conductors 2301 is Z (Z is 9 in this embodiment). Correspondingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot interiors 21011 of the U-shaped conductor 2301 is Z (Z is 9 in this embodiment); in this embodiment, the slot pitch of the U-shaped conductor with a slot pitch of 9 between the two slot interiors is a full pitch. Therefore, in this embodiment, the slot pitch between the two slot interiors 21011 of the 54 U-shaped conductors 2301 of the third coil group 130 is a full pitch.

[0135] For example, Figure 24 As shown, the multiple U-shaped conductors 210A of the first coil group 110 include: multiple first U-shaped conductors 2101, the slot pitch of the slot outer turning portion 21021 of the first U-shaped conductor is a long pitch; and multiple second U-shaped conductors 2102, the slot pitch of the slot outer turning portion 21021 of the multiple second U-shaped conductors is a short pitch.

[0136] Combine Figure 24 The first coil group 110 includes: 54 U-shaped conductors 210A (2101, 2102)

[0137] Furthermore, the 54 U-shaped conductors 210A include 18 first U-shaped conductors 2101, and the slot pitch between two slot inner portions 21011 of the 18 first U-shaped conductors 2101 is X (X is 11 in this embodiment). Accordingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot inner portions 21011 of the first U-shaped conductors 2101 is X (X is 11 in this embodiment); the 54 U-shaped conductors 210 also include 36 second U-shaped conductors 2102, and the slot pitch between two slot inner portions 21011 of the 36 second U-shaped conductors 2102 is Y (Y is 8 in this embodiment). Accordingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot inner portions 21011 of the first U-shaped conductors 2101 is X (X is 11 in this embodiment). The slot pitch between the two slot interiors 21011 is Y (Y is 8 in this embodiment); in this embodiment, a U-shaped conductor with a slot pitch of 9 between the two slot interiors is a full pitch, a U-shaped conductor with a slot pitch greater than 9 is a long pitch, and a U-shaped conductor with a slot pitch less than 9 is a short pitch. It can be seen that in this embodiment, the multiple U-shaped conductors 210A of the first coil group 110 include 18 first U-shaped conductors 2101, the slot pitch between the two slot interiors 2101 of the U-shaped conductor 2101 is a long pitch, and 36 second U-shaped conductors 2102, the slot pitch between the two slot interiors 2101 of the U-shaped conductor 2102 is a short pitch.

[0138] Optional, such as Figure 19 、 Figure 23 As shown, the slot pitch of the outer slot turning portions 21021 of the plurality of U-shaped conductors 220A ( 2201 , 2202 ) of the second coil assembly 120 is the same as the slot pitch of the outer slot turning portions of the plurality of U-shaped conductors 210 ( 2101 , 2102 ) of the first coil assembly 110 .

[0139] Optionally, based on the above embodiment, Figure 19 、 Figure 23Among the 54 U-shaped conductors 210 (2101, 2102) of the first coil group 110, the slot pitch between two slot interiors 21011 of 36 U-shaped conductors 2101 is X (X is 10 in this embodiment). Accordingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot interiors 21011 of the U-shaped conductor 2101 is X (X is 10 in this embodiment). Among the 54 U-shaped conductors 210, the slot pitch between two slot interiors 21011 of 18 U-shaped conductors 2102 is Y (Y is 7 in this embodiment). Accordingly, the slot pitch between two slot interiors 21011 of the U-shaped conductor 2102 is Y (Y is 7 in this embodiment). The slot pitch between the two slot interiors 21011 of the U-shaped conductor 2201 is X (X is 10 in this embodiment). Correspondingly, the slot pitch of the outer slot turn portion 21021 connecting the two slot interiors 21011 of the U-shaped conductor 2201 is X (X is 10 in this embodiment). The slot pitch between the two slot interiors of the 36 U-shaped conductors 2102 in the 108 U-shaped conductors 220A is Y (Y is 7 in this embodiment). Correspondingly, the slot pitch between the two slot interiors 21011 of the U-shaped conductor 2102 is Y (Y is 7 in this embodiment). Therefore, it can be seen that in this embodiment, the slot pitch of the outer slot turn portions 21021 of the 108 U-shaped conductors 220A (2201, 2202) of the second coil 120 is the same as the slot pitch of the outer slot turn portions of the 54 U-shaped conductors 210 (2201, 2202) of the first coil assembly 110.

[0140] Optional, such as Figure 21 、 Figure 25 As shown, the slot pitch of the outer slot turning portion 21021 of the plurality of U-shaped conductors 220B ( 2201 ) of the second coil group 120 is the same as the slot pitch of the outer slot turning portion 21021 of the plurality of U-shaped conductors 230 ( 2301 ) of the third coil group 130 .

[0141] Optionally, based on the above embodiment, Figure 6 、 Figure 10The slot pitch between the two slot interiors 21011 of the 54 U-shaped conductors 230 (2301) of the third coil group 130 is Z (Z is 9 in this embodiment). Correspondingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot interiors 21011 of the U-shaped conductor 2301 is Z (Z is 9 in this embodiment); the slot pitch between the two slot interiors 21011 of the 108 U-shaped conductors 220B (2201) of the second coil group 120 is is Z (Z is 9 in this embodiment), and accordingly, the slot pitch of the slot outer turning portion 21021 connecting the two slot inner portions 21011 of the U-shaped conductor 2201 is Z (Z is 9 in this embodiment); it can be seen that, in this embodiment, the slot pitch of the slot outer turning portion 21021 of the 108 U-shaped conductors 220B (2201) of the second coil 120 is the same as the slot pitch of the slot outer turning portion of the 54 U-shaped conductors 230 (2301) of the third coil group 130.

[0142] For example, Figure 16-25 As shown, the turning portion 21021 of each U-shaped conductor of each coil group of the stator winding 10 is located on one side of the slot outer end 25 of the stator core 20, and the multiple slot outer end portions 21031 of each U-shaped conductor of each coil group of the stator winding 10 are located on the other side of the slot outer end 26 of the stator core 20.

[0143] Optionally, based on the above embodiment, Figures 16 to 25 In this embodiment, the turn portion 21021 of each U-shaped conductor in the first coil group 110 of the stator winding 10 is located on one side of the slot outer end 25 of the stator core 20, and the turn portion 21021 of each U-shaped conductor in the third coil group 130 of the stator winding is located on one side of the slot outer end 25 of the stator core 20; the multiple slot outer ends 21031 of each U-shaped conductor in the first coil group 110 of the stator winding 10 are located on the other side of the slot outer end 26 of the stator core 20, the multiple slot outer ends 21031 of each U-shaped conductor in the second coil group 120 of the stator winding 10 are located on the other side of the axial direction 26 of the stator core 20, and the multiple slot outer ends 21031 of each U-shaped conductor in the third coil group 130 of the stator winding 10 are located on the other side of the axial direction 26 of the stator core 20;

[0144] Furthermore, if Figures 22 to 25 As shown, in this embodiment, the stator winding further includes a turn portion 21021 of each U-shaped conductor in the second coil group 120 located on one side of the slot outer end 25 of the stator core 20, and multiple slot outer ends 21031 of each U-shaped conductor in the second coil group 120 in the stator winding 10 are located on the other side of the axial direction 26 of the stator core 20;

[0145] For example, Figure 16-25As shown, the circumferential extension directions of the two radially adjacent slot outer ends 21031 in the stator winding 10 are opposite.

[0146] Optionally, based on the above embodiment, Figures 18 and 19 All slot outer ends 21031 of the first coil group 110 in the stator winding 10 extend in the same direction in the circumferential direction of the stator core, all extending counterclockwise (rightward). Figure 20 、 Figure 21 , all slot outer ends 21031 of the third coil group 130 extend in the same direction on the circumference of the stator core and extend clockwise (leftward). The extending direction of all slot outer ends of the first coil group 110 on the circumference of the stator core is opposite to the extending direction of all slot outer ends of the third coil group 130 on the circumference of the stator core. Optionally, combined with Figure 22 、 Figure 23 The ends of the second coil group 120 in the stator winding 10 located outside the slots of the stator core in the radial direction of layer N-2 extend in the same counterclockwise (leftward) direction in the circumferential direction of the stator core. The ends of the second coil group 120 located outside the slots of the stator core in the radial direction of layer N-1 extend in the same clockwise (leftward) direction in the circumferential direction of the stator core.

[0147] Combine Figure 16 、 Figure 18 、 Figure 20 、 Figure 22 、 Figure 24 The slot outer end 21031 of the first coil group 110 in the stator winding is located at the first radial layer of the stator core 20 and extends to the right in the circumferential direction of the stator core. The first slot outer end 21031 of the second coil group 120 is located at the second radial layer of the stator core 20 and extends to the left in the circumferential direction of the stator core. The second slot outer end 21031 of the second coil group 120 is located at the third radial layer of the stator core 20 and extends to the right in the circumferential direction of the stator core. The slot outer end 21031 of the third coil group 130 is located at the fourth radial layer of the stator core 20 and extends to the left in the circumferential direction of the stator core. It can be seen that the extension directions of the two adjacent slot outer ends 21031 in the stator core 20 in the circumferential direction of the stator core are opposite.

[0148] For example, Figure 21 As shown, the turning directions of the two outer-slot turning portions 21021 of the two U-shaped conductors 230 in the adjacent slots of the same phase in the third coil group 130 are opposite.

[0149] Optionally, based on the above embodiment, Figure 21 The third coil group 130 includes a U-phase coil group, a V-phase coil group, and a W-phase coil group. The U-phase coil group in the third coil group 130 is now described as an example. Figure 21 、 Figure 24 、 Figure 25 The first slot of the U-shaped conductor 230-1 (i.e., U1) is located in the first slot of the stator core 20, and the second slot of the U-shaped conductor 230-1 is located in the tenth slot of the stator core 20, that is, the turning direction of the slot outer turning portion 21021 connecting the two slots of the U-shaped conductor 230-1 is counterclockwise (i.e., rightward); further, the first slot of the U-shaped conductor 230-2 (i.e., U2) in the adjacent slot is located in the second slot of the stator core 20, and the second slot of the U-shaped conductor 230-2 is located in the tenth slot of the stator core 20. 0, that is, the turning direction of the slot outer turn portion 21021 connecting the two slots of the U-shaped conductor 230-2 is counterclockwise (i.e., rightward). Furthermore, the first slot of the U-shaped conductor 230-3 (i.e., U3) in the adjacent slot is located in the third slot of the stator core 20, and the second slot of the U-shaped conductor 230-3 is located in the 102nd slot of the stator core 20, that is, the turning direction of the slot outer turn portion 21021 connecting the two slots of the U-shaped conductor 230-3 is clockwise (i.e., leftward).

[0150] It can be seen that the turning directions of the two outer-slot turning portions 21021 of two U-shaped conductors 230 - 2 and 230 - 3 of the three U-shaped conductors in adjacent slots 21 of the third coil group 130 are opposite.

[0151] For example, Figure 19 As shown, the turning directions of the two outer-slot turning portions 21021 of the two U-shaped conductors 210 in the adjacent slots of the same phase in the first coil group 110 are the same.

[0152] Optionally, based on the above embodiment, Figure 19 The first coil group 110 includes a U-phase coil group, a V-phase coil group, and a W-phase coil group. The U-phase coil group in the first coil group 110 is described as an example. Figure 19 、 Figure 24 、 Figure 26The first slot of the U-shaped conductor 2101 (i.e., U1) is located in the first slot of the stator core 20, and the second slot of the U-shaped conductor 2102 is located in the eleventh slot of the stator core 20, that is, the turning direction of the slot outer turning portion 21021 connecting the two slots of the U-shaped conductor 2101 is counterclockwise (i.e., rightward); further, the first slot inner portion 21011 of the U-shaped conductor 2102 (i.e., U2) of the adjacent slot is located in the second slot of the stator core 20, and the second slot inner portion of the U-shaped conductor 2102 is located in the twelfth slot of the stator core 20, that is, the slot outer turning portion 21021 connecting the two slots of the U-shaped conductor 2102 is counterclockwise (i.e., rightward). 21 turns in a counterclockwise (i.e., rightward) direction. Furthermore, the first slot 21011 of the U-shaped conductor 2103 (i.e., U3) of the adjacent slot is located in the third slot of the stator core 20, and the third slot of the U-shaped conductor 2103 is located in the tenth slot of the stator core 20, that is, the turning direction of the slot outer turn 21021 connecting the two slots of the U-shaped conductor 2102 is counterclockwise (i.e., rightward). It can be seen that the turning directions of the two slot outer turns 21021 of the two U-shaped conductors 210 of the three U-shaped conductors 2101, 2102, and 2103 of the adjacent slots 21 in the same phase in the first coil group 110 are the same.

[0153] For example, Figure 16-26 As shown, the first slot outer end portion 21031 and the second slot outer end portion 21031 have an extension end 5. In addition to the extension end connected to the lead wire 4, the N-1 layer extension end 5 located in the same radial direction of the stator core and adjacent to each other is connected to the N layer extension end 5, where N is an even number.

[0154] Optionally, based on the above embodiment, Figures 16 to 26 As shown, in this embodiment, the first slot outer end portion 21031 and the second slot outer end portion 21031 both have an extended end 5. Except for the extended end 5 connected to the lead wire 4, (the lead wires of each embodiment of the present invention include terminals and neutral points of each phase, i.e., U-phase terminal, V-phase terminal, W-phase terminal, U-phase neutral point, V-phase neutral point, and W-phase neutral point), the remaining first-layer extended ends located in the same radial direction and adjacent to the stator core are connected to the second-layer extended ends, the third-layer extended ends located in the same radial direction and adjacent to the stator core are connected to the fourth-layer extended ends, and the fifth-layer extended ends located in the same radial direction and adjacent to the stator core are connected to the sixth-layer extended ends. Furthermore, the extended ends of the two connected slot outer ends in the stator winding are both located in radially adjacent odd and even layers of the stator core. In this embodiment, the positions of the extended end 5 connected to the terminal and the extended end 5 connected to the neutral point in the lead wire 4 can be interchanged, i.e., this embodiment does not limit the positions of the terminals and neutral points in the lead wires.

[0155] Further, combined with Figure 28In this embodiment, the stator winding 10 is connected in star shape, with U-phase winding, V-phase winding, and W-phase winding, combined with Figure 15 The U-phase winding has two branches U1 and U2 connected in series. Each branch is connected in series to form the U-phase lead wire, U-phase neutral point, V-phase winding, and W-phase winding. The connection is the same as that of the U-phase winding, and will not be repeated again.

[0156] Manufacturing method:

[0157] For example, Figure 1 As shown, the stator winding 10 is star-connected, with the U-phase winding, the V-phase winding, and the W-phase winding. The U-phase winding has two branches U1 and U2 connected in series, and each branch is connected in series. The V-phase winding and the W-phase winding are connected in the same way as the U-phase winding, and will not be described again.

[0158] The stator winding is sequentially provided with a first coil group 110, a second coil group 120, and a third coil group 130 (the second coil group can be provided with 0, 1, 2, 3, or any integer value) from the outside to the inside;

[0159] For example, Figure 1-4 As shown, the first coil group 110 is composed of a U-phase first coil group, a V-phase first coil group, and a W-phase first coil group. Each phase first coil group 110 has eight U-shaped conductors 210, and the three-phase first coil group has 24 U-shaped conductors 210. Furthermore, the 24 U-shaped conductors 210 of the first coil group are further divided into 12 first U-shaped conductors 2101 and 12 second U-shaped conductors 2102.

[0160] Combine Figure 3 、 Figure 4 First, 24 U-shaped conductors 210 (12 first U-shaped conductors 2101 and 12 second U-shaped conductors 2102) are sequentially inserted from one end 25 of the stator core into the adjacent 48 slots at the other end 26 of the stator core. The first U-shaped conductor 2101-1 (the first first U-shaped conductor of the U phase) is inserted into the first layer of the first slot and the first layer of the eighth slot of the stator core. The second U-shaped conductor 2102-1 (the first second U-shaped conductor of the U phase) is inserted into the first layer of the second slot and the first layer of the seventh slot of the stator core.

[0161] The first U-shaped conductor 2101-2 (the first first U-shaped conductor of the W phase) is inserted into the first layer of the fifth slot and the first layer of the twelfth slot of the stator core. The second U-shaped conductor 2102-2 (the first second U-shaped conductor of the W phase) is inserted into the first layer of the sixth slot and the first layer of the eleventh slot of the stator core.

[0162] The first U-shaped conductor 2101-3 (the first first U-shaped conductor of the V phase) is inserted into the first layer of the ninth slot and the first layer of the sixteenth slot of the stator core. The second U-shaped conductor 2102-3 (the first second U-shaped conductor of the V phase) is inserted into the first layer of the tenth slot and the first layer of the fifteenth slot of the stator core.

[0163] The first U-shaped conductor 2101-4 (the second first U-shaped conductor of the U phase) is inserted into the first layer of the 13th slot and the first layer of the 20th slot of the stator core. The second U-shaped conductor 2102-4 (the second second U-shaped conductor of the U phase) is inserted into the first layer of the 14th slot and the first layer of the 19th slot of the stator core.

[0164] Until the first U-shaped conductor 2101-12 (the fourth first U-shaped conductor of the V-phase) is inserted into the first layer in the 45th slot of the stator core, the first layer in the 4th slot, and the second U-shaped conductor 2102-12 (the fourth second U-shaped conductor of the V-phase) is inserted into the first layer in the 46th slot of the stator core, the first layer in the 3rd slot;

[0165] For example, Figure 1-8 As shown, secondly, the second coil group 120 is composed of a U-phase second coil group, a V-phase second coil group, and a W-phase second coil group. Each phase second coil group 120 has 16 U-shaped conductors 220A, and the three-phase second coil group 120 has 48 U-shaped conductors 220A. Furthermore, the 48 U-shaped conductors 220A of the second coil group 120 are further divided into 24 first U-shaped conductors 2201 and 24 second U-shaped conductors 2202.

[0166] Combine Figure 7 、 Figure 8 First, 48 U-shaped conductors 220A (24 first U-shaped conductors 2201 and 24 second U-shaped conductors 2202) are sequentially inserted from one end 25 of the stator core into the adjacent 48 slots at the other end 26 of the stator core. The first U-shaped conductor 2201-1 (the first first U-shaped conductor of the U phase) is inserted into the third layer of the first slot of the stator core and the second layer of the eighth slot. The second U-shaped conductor 2202-1 (the first second U-shaped conductor of the U phase) is inserted into the third layer of the second slot of the stator core and the second layer of the seventh slot.

[0167] The first U-shaped conductor 2201-2 (the first first U-shaped conductor of the W phase) is inserted into the third layer in the third slot of the stator core and the second layer in the tenth slot. The second U-shaped conductor 2102-2 (the first second U-shaped conductor of the W phase) is inserted into the third layer in the fourth slot of the stator core and the second layer in the ninth slot.

[0168] The first U-shaped conductor 2201-3 (the first first U-shaped conductor of the V phase) is inserted into the third layer in the fifth slot of the stator core and the second layer in the twelfth slot. The second U-shaped conductor 2202-3 (the first second U-shaped conductor of the V phase) is inserted into the third layer in the sixth slot of the stator core and the second layer in the eleventh slot.

[0169] Insert the first U-shaped conductor 2201-4 (the second first U-shaped conductor of the U phase) into the third layer of the seventh slot and the second layer of the fourteenth slot of the stator core. Insert the second U-shaped conductor 2202-4 (the second second U-shaped conductor of the U phase) into the third layer of the eighth slot and the second layer of the thirteenth slot of the stator core.

[0170] Until the first U-shaped conductor 2201-24 (the eighth first U-shaped conductor of the V-phase) is inserted into the first layer in the 47th slot of the stator core and the second layer in the fifth slot, and the second U-shaped conductor 2102-12 (the eighth second U-shaped conductor of the V-phase) is inserted into the third layer in the 48th slot of the stator core and the second layer in the fourth slot;

[0171] For example, Figure 1-6 As shown, the third coil group 130 is composed of a U-phase first coil group, a V-phase first coil group, and a W-phase first coil group. Each phase first coil group 130 is composed of 8 U-shaped conductors 230, and the three-phase first coil group is composed of 24 U-shaped conductors 230;

[0172] First, the 24 U-shaped conductors 230 are sequentially inserted from one end 25 of the stator core into the adjacent 48 slots at the other end 26 of the stator core. The U-shaped conductor 230-1 (the first U-shaped conductor of the U phase) is inserted into the fourth layer in the first slot of the stator core and the fourth layer in the forty-third slot. The U-shaped conductor 230-2 (the second U-shaped conductor of the U phase) is inserted into the fourth layer in the second slot of the stator core and the fourth layer in the eighth slot.

[0173] Insert the U-shaped conductor 230-3 (the first U-shaped conductor of the W phase) into the fourth layer in the fifth slot and the fourth layer in the forty-seventh slot of the stator core. Insert the U-shaped conductor 230-4 (the second U-shaped conductor of the W phase) into the fourth layer in the sixth slot and the fourth layer in the twelfth slot of the stator core.

[0174] Insert the U-shaped conductor 230-5 (the first U-shaped conductor of the V phase) into the fourth layer in the ninth slot and the fourth layer in the third slot of the stator core. Insert the U-shaped conductor 230-6 (the second U-shaped conductor of the V phase) into the fourth layer in the tenth slot and the fourth layer in the sixteenth slot of the stator core.

[0175] Until the U-shaped conductor 230-23 (the seventh U-shaped conductor of the V-phase) is inserted into the fourth layer in the 45th slot and the fourth layer in the 38th slot of the stator core, and the U-shaped conductor 230-24 (the eighth U-shaped conductor of the V-phase) is inserted into the fourth layer in the 46th slot and the fourth layer in the 4th slot of the stator core;

[0176] like Figure 1-8 As shown, the stator winding is finally extended axially from the slot interior 21011 of the stator core slot 21 to the outside of the other end 26 of the stator core 20. The slot outer end portion of the first layer outside the stator core slot (i.e., the slot outer end portion of the first coil group 110) is bent clockwise (leftward) and extended by three slot pitches (i.e., 3d) along the same direction of the stator core circumference. Correspondingly, the slot outer end portion of the second layer outside the stator core slot (i.e., one slot outer end portion of the second coil group 120) is bent counterclockwise (toward) along the same direction of the stator core circumference. The outer slot end portion of the third layer outside the stator core slot (i.e., the other outer slot end portion of the second coil group 120) is bent and extended by three slot pitches (i.e., 3d) in the same circumferential direction of the stator core. The outer slot end portion of the fourth layer outside the stator core slot (i.e., the outer slot end portion of the third coil group 130) is bent and extended by three slot pitches (i.e., 3d) in the same circumferential direction of the stator core, thereby forming a three-phase stator winding.

[0177] Further, combined with Figure 15 From the planar expansion diagram, the arrangement position relationship of a U-phase winding in the stator winding 10 is shown. The stator winding 10 is star-connected, with the U-phase winding, the V-phase winding, and the W-phase winding. The U-phase winding is connected in series with two branches U1 and U2. Each branch is connected in series. The V-phase winding and the W-phase winding are connected in the same way as the U-phase winding, and will not be described again.

[0178] Furthermore, the U terminal of the U-phase winding of the three-phase stator winding can be connected to an outer slot end 21031 of any slot or layer in the U-phase winding, and the neutral point can be connected to an outer slot end 21031 in the same radial direction as the outer slot end 21031 connected to the U terminal of the U-phase winding. In this embodiment, the U terminal of the U-phase winding is connected to an outer slot end 21031 adjacent to an outer slot end 21031 located in the second radial layer, and the neutral point of the U-phase winding is connected to an outer slot end 21031 located in the first radial layer. The remaining two outer slot ends adjacent to each other in the same radial direction are connected to form the stator winding. In this embodiment, the connection positions of the terminals and neutral points of each phase are interchangeable. By using fewer types of coil units and a simple arrangement, the use of busbars and busbars can be reduced, and the inconsistency between the twist direction of the outer slot ends and the twisted slot spacing can be eliminated. This allows the branches and neutral points of each phase winding to be arranged in any slot or layer, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0179] The present invention further provides an embodiment of a motor stator, such as Figure 14 As shown, the stator winding 10 includes a first coil group 110, a second coil group 120 (a second coil group 120 composed of multiple U-shaped conductors 220A), and a third coil group 130. The structures of these coil groups are described in the above embodiments and will not be repeated here. In this embodiment, the connection positions of the phase terminals and the neutral point are interchangeable. By using fewer types of coil units and a simpler arrangement, the use of busbars and busbars can be reduced, and the inconsistency between the twist direction of the outer ends of the slots and the twisted slot spacing can be eliminated, allowing the branches and neutral points of each phase winding to be arranged in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing production costs, and improving processing efficiency.

[0180] An embodiment of the present invention further provides a motor, comprising: a rotor and the motor stator described in any one of the above embodiments.

[0181] 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 repeated here.

[0182] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0183] Finally, it should be noted that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection 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 and may include many other equivalent embodiments without departing from the scope of the present invention. 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; stator winding, the stator winding is mounted on the stator core, The stator winding is three-phase, and has Q pole-pair coils, and Q / number of slots per pole per phase = P, where P is an integer, and the number of slots per pole per phase is greater than or equal to 2, and each phase stator winding is connected in series with each phase stator winding; The stator winding comprises: a first coil group and a third coil group which are sequentially arranged from the inside to the outside; The first coil group has a plurality of U-shaped conductors, and the U-shaped conductors include: Two slot outer ends, the two slot outer ends being located at the same radial layer of the stator core, the multiple slot outer ends of the multiple U-shaped conductors of the first coil group extending in the same circumferential direction of the stator core and having the same circumferential span; Two slot interiors, wherein the two slot interiors are located in the same radial layer of the stator core and are separated by a specified slot pitch; The slots of the plurality of U-shaped conductors of the first coil group are sequentially located in the same radial layer of the stator core along the circumferential direction of the stator core; The third coil group has a plurality of U-shaped conductors, and the U-shaped conductors include: Two slot outer ends, the two slot outer ends being located at the same radial layer of the stator core, the multiple slot outer ends of the multiple U-shaped conductors of the third coil group extending in the same circumferential direction and having the same circumferential span; Two slot interiors, wherein the two slot interiors are located in the same radial layer of the stator core and are separated by a specified slot pitch; The slots of the plurality of U-shaped conductors of the third coil group are sequentially located in the same radial layer of the stator core along the circumferential direction; The plurality of U-shaped conductors of the first coil group further include: an outer slot turning portion, the outer slot turning portion being located at an outer end of a stator core slot and connecting two slots of the plurality of U-shaped conductors of the first coil group; The plurality of U-shaped conductors of the third coil group further include: an outer slot turning portion, the outer slot turning portion being located at an outer end of a stator core slot and connecting two slots of the plurality of U-shaped conductors of the third coil group; The turning directions of the two outer turning parts of the two U-shaped conductors in the adjacent slots of the same phase in the third coil group are opposite; The turning directions of the two outer turning parts of the two U-shaped conductors in the same-phase adjacent slots in the first coil group are the same; The invention also includes a second coil group disposed between the first coil group and the third coil group, wherein the second coil group includes a plurality of U-shaped conductors, and the U-shaped conductors include: Two slot outer ends, the two slot outer ends are located in two adjacent layers in the radial direction of the stator core, and the slot outer ends of the plurality of U-shaped conductors located in the same layer in the radial direction of the stator core extend in the same direction in the circumferential direction of the stator core and have the same span in the circumferential direction; The insides of the two slots are located in two radially adjacent layers of the stator core and separated by a predetermined slot pitch; the insides of the multiple slots of the multiple U-shaped conductors of the second coil group are located in two radially adjacent layers of the stator core slots in sequence along the circumferential direction of the stator core; The outer ends of two slots in the stator winding that are radially adjacent to each other in the stator core extend in opposite directions in the circumferential direction.

2. The motor stator according to claim 1, characterized in that: The slot pitch of the out-slot turn portions of the plurality of U-shaped conductors of the first coil group is different from the out-slot turn portions of the plurality of U-shaped conductors of the third coil group.

3. The motor stator according to claim 2, characterized in that: The plurality of U-shaped conductors of the first coil group include: a plurality of first U-shaped conductors, wherein the slot pitch of the outer slot turning portion of the plurality of first U-shaped conductors is a long pitch; A plurality of second U-shaped conductors are provided, wherein the slot pitch of the outer slot turning portions of the plurality of second U-shaped conductors is a short pitch.

4. The motor stator according to claim 3, characterized in that: The slot pitch of the outer turn portions of the plurality of first U-shaped conductors is 7, and the slot pitch of the outer turn portions of the plurality of second U-shaped conductors is 5.

5. The motor stator according to claim 3, characterized in that: The slot pitch of the outer turn portions of the plurality of first U-shaped conductors is 10, and the slot pitch of the outer turn portions of the plurality of second U-shaped conductors is 7.

6. The motor stator according to claim 3, characterized in that: The slot pitch of the outer turn portions of the plurality of first U-shaped conductors is 11, and the slot pitch of the outer turn portions of the plurality of second U-shaped conductors is 8.

7. The motor stator according to claim 2, characterized in that: The slot pitch of the outer slot turning portions of the plurality of U-shaped conductors of the third coil group is a full pitch.

8. The motor stator according to claim 7, characterized in that: The slot pitch of the outer turning parts of the slots of the plurality of U-shaped conductors is 6.

9. The motor stator according to claim 7, characterized in that: The slot pitch of the outer slot turning parts of the plurality of U-shaped conductors is 9.

10. The motor stator according to claim 1, characterized in that: The slot pitch of the out-slot turn portions of the plurality of U-shaped conductors of the second coil group is the same as the slot pitch of the out-slot turn portions of the plurality of U-shaped conductors of the first coil group.

11. The motor stator according to claim 1, characterized in that: The slot pitch of the out-slot turn portions of the plurality of U-shaped conductors of the second coil group is the same as the slot pitch of the out-slot turn portions of the plurality of U-shaped conductors of the third coil group.

12. The motor stator according to claim 1, characterized in that: The turning portion of each U-shaped conductor of each coil group of the stator winding is located on one side of the outer end of the stator core slot, and the multiple slot outer ends of each U-shaped conductor of each coil group of the stator winding are located on the other side of the outer end of the stator core slot.

13. The motor stator according to claim 12, characterized in that: Each slot outer end has an extension end. Except for the extension end connected to the lead wire, the N-1 layer extension ends and the N layer extension ends adjacent to each other in the same radial direction of the stator core are connected, where N is an even number.

14. A motor, characterized in that: include: A rotor and a stator of a motor as claimed in any one of claims 1 to 13.

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