Flat wire motor stator and motor

Abstract

The utility model provides a flat wire motor stator and a flat wire motor. The flat wire motor stator comprises a stator iron core and a stator flat wire winding. The stator iron core is annular, and a plurality of winding grooves are formed in the inner wall of the stator iron core in the circumferential direction of the stator iron core. A wire outlet structure of each phase flat wire winding in three phases of flat wire windings of the stator flat wire winding is as follows: a phase wire outlet end and a phase lead end of each branch are arranged on the same column of twisted legs in the radial direction of the stator core and correspond to any two adjacent n layer and (n + 1) layer in the same winding groove, the value range of n and n + 1 is 1-2N, and the value range of n and n + 1 is 1-2N in the circumferential direction of the stator core. The phase leading-out terminal of each branch corresponds to a plurality of winding grooves which are continuously arranged on the nth layer, and the phase leading-out terminal of each branch corresponds to a plurality of winding grooves which are continuously arranged on the (n + 1) th layer; each phase of flat wire winding is provided with a first branch and a second branch which are connected in parallel and are reversely symmetrical in winding mode, and the winding mode comprises arrangement and connection rules of U-shaped conductors with different pitches. The flat wire motor stator concentrates outgoing wires in a small range, does not occupy the inner diameter space of the stator, and facilitates the installation of the rotor.

Description

Technical Field

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

[0002] In flat-wire stator windings where the pole number P is an even multiple of 3, the stator flat-wire winding is typically open 180 degrees around the circumference, with two separate branches. This complex output structure requires a busbar that wraps around half a circle or even more before being brought together for output, resulting in complex manufacturing and high costs. Some current output structures also occupy some of the stator core's inner diameter, significantly limiting rotor installation.

[0003] Therefore, a new flat wire motor stator and motor are needed. Utility Model Content

[0004] In a first aspect, the present application provides a flat wire motor stator, comprising a stator core and a stator flat wire winding. The stator core is annular and has a plurality of winding slots formed on its inner wall along its circumference. The total number of winding slots, Q, is a natural number and a multiple of 3. The number of winding slot layers is 2N, where N ≥ 2.

[0005] The stator flat wire winding is embedded in multiple winding slots and has a three-phase flat wire winding. The number of poles P of the stator flat wire winding is an even multiple of 3, the number of slots per pole per phase q is 3, and each phase flat wire winding has L parallel branches, where L is greater than or equal to 2. Each branch is connected and wound by multiple U-shaped conductors inserted into the winding slots. The U-shaped conductor has a plug-in end and a welding end. The welding end of the U-shaped conductor has two twisted legs outside the winding slot. The flat wire motor stator wire is output from the welding end.

[0006] The output structure of each phase flat wire winding is as follows: the phase output end and the phase lead end of each branch are arranged on the same row of twisted legs in the radial direction of the stator core and correspond to any two adjacent nth and n+1th layers in the same winding slot, where n and n+1 are in the range of 1 to 2N. In the circumferential direction of the stator core, the phase output end of each branch corresponds to a plurality of winding slots arranged continuously in the nth layer, and the phase lead end of each branch corresponds to a plurality of winding slots arranged continuously in the n+1th layer.

[0007] Each phase flat wire winding has two parallel-connected first and second branches with reversely symmetrical winding patterns. The winding patterns include a U-shaped conductor arrangement and connection rule with different pitches.

[0008] In some optional embodiments of the first aspect of the present application, the winding is continuously performed from the outside of the stator core to the inside along the circumference of the stator core, with the first branch forming a first winding section and the second branch forming a second winding section;

[0009] The two branches are continuously wound from the inside to the outside of the stator core along the circumference of the stator core, the first branch forms the third winding section, and the second branch forms the fourth winding section;

[0010] Viewed from the same winding direction, the winding method of the first winding segment is the same as that of the fourth winding segment, the winding method of the third winding segment is the same as that of the second winding segment, and the winding directions include a first direction from the phase output terminal to the phase lead terminal and a second direction from the phase lead terminal to the phase output terminal.

[0011] In some optional embodiments of the first aspect of the present application, the phase outlet end and the phase lead end of each branch are arranged in the same row of twisted legs in the radial direction of the stator core and respectively correspond to the second outermost 2N-1 layer and the outermost 2N layer in the same winding slot.

[0012] In some optional embodiments of the first aspect of the present application, the winding slot has N layer groups, each layer group has two adjacent odd-numbered layers and an even-numbered layer,

[0013] The winding methods of the second winding section include:

[0014] In each layer group, multiple U-shaped conductors with the same pitch are used for cross-layer wiring.

[0015] In some optional embodiments of the first aspect of the present application, a U-shaped conductor with a pitch of 8 is used at the beginning or end of the second winding section for same-layer wiring.

[0016] In some optional embodiments of the first aspect of the present application, N is a natural number greater than 2, the stator flat wire winding has a full-pitch structure or a cross-short structure,

[0017] U-shaped conductors with a pitch of a are used for cross-layer insertion in all layer groups, and U-shaped conductors with a pitch of a are also used between two adjacent layer groups to perform cross-layer insertion to achieve winding transition between layer groups.

[0018] In some optional embodiments of the first aspect of the present application, a is selected from 8, 9 or 10.

[0019] In some optional embodiments of the first aspect of the present application, N is a natural number greater than 2, the stator flat wire winding has a first separated short-pitch structure,

[0020] In the first separated short-pitch structure, N is an odd number greater than 2, and each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot modules in the radial direction of the stator core. Each rectangular winding slot module occupies N layers of winding slots in the radial direction of the stator core and occupies three consecutively arranged winding slots in the circumferential direction of the stator core. The two rectangular winding slot modules are offset by one winding slot in the circumferential direction of the stator core.

[0021] In each rectangular winding slot module: U-shaped conductors with a pitch of a are used in all layer groups for cross-layer insertion;

[0022] The stator core is radially arranged across two rectangular winding slot modules using U-shaped conductors with a pitch of a±1 for cross-layer insertion.

[0023] Between every two adjacent layer groups, a U-shaped conductor with a pitch of a is used to insert wires across the layers to achieve winding transition between the layer groups.

[0024] In some optional embodiments of the first aspect of the present application, a is 9.

[0025] In some optional embodiments of the first aspect of the present application, N is a natural number greater than 2, the stator flat wire winding has a second separated short-pitch structure, N in the second separated short-pitch structure is an even number greater than 2, and the phase unit of each phase flat wire winding has two consecutively arranged rectangular winding slot modules in the radial direction of the stator core, each rectangular winding slot module occupies N layers of winding slots in the radial direction of the stator core and occupies three consecutively arranged winding slots in the circumferential direction of the stator core, and the two rectangular winding slot modules are staggered by one winding slot in the circumferential direction of the stator core.

[0026] In each rectangular winding slot module: U-shaped conductors with a pitch of a are used for cross-layer insertion in all layer groups, and U-shaped conductors with a pitch of a are also used between two adjacent layer groups to perform cross-layer insertion for winding transition between layer groups;

[0027] Between two layer groups belonging to different rectangular winding slot modules, a U-shaped conductor with a pitch of a' is used to perform cross-layer insertion to achieve winding transition between the layer groups.

[0028] In some optional embodiments of the first aspect of the present application, a is 9.

[0029] In some optional embodiments of the first aspect of the present application, a' is selected from 8 or 10.

[0030] In some optional embodiments of the first aspect of the present application, the winding slot has N layer groups, each layer group has two adjacent odd-numbered layers and an even-numbered layer,

[0031] The winding methods of the first winding section include:

[0032] In each layer group, two U-shaped conductors with a pitch difference of 4 are used to alternately cross the layers along the circumference of the stator core.

[0033] In some optional embodiments of the first aspect of the present application, a U-shaped conductor with a pitch of 10 is used at the beginning or end of the first winding section for same-layer wiring.

[0034] In some optional embodiments of the first aspect of the present application, N is a natural number greater than 2, and the stator flat wire winding has a full-pitch structure or a cross-short structure;

[0035] U-shaped conductors with a pitch of b and a pitch of c are used in each layer group to alternately insert wires across the layers along the circumference of the stator core. U-shaped conductors with a pitch of c are also used between two adjacent layer groups to perform winding transition between the layer groups. cb is equal to 4.

[0036] In some optional embodiments of the first aspect of the present application, b is 7 and c is 11.

[0037] In some optional embodiments of the first aspect of the present application, b is 8 and c is 12.

[0038] In some optional embodiments of the first aspect of the present application, b is 6 and c is 10.

[0039] In some optional embodiments of the first aspect of the present application, N is a natural number greater than 2, the stator flat wire winding has a first separated short-pitch structure, N in the first separated short-pitch structure is an odd number greater than 2, and each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot modules in the radial direction of the stator core, each rectangular winding slot module occupies N layers of winding slots in the radial direction of the stator core and occupies three consecutively arranged winding slots in the circumferential direction of the stator core, and the two rectangular winding slot modules are staggered by one winding slot in the circumferential direction of the stator core;

[0040] In each rectangular winding slot module: U-shaped conductors with a pitch of b and a pitch of c are used in all layer groups to alternately insert wires across the layers along the circumference of the stator core. U-shaped conductors with a pitch of c are also used between two adjacent layer groups to perform winding transition between the layer groups. cb is equal to 4;

[0041] The layer group spanning two rectangular winding slot modules adopts U-shaped conductors with a pitch of b' and U-shaped conductors with a pitch of c' to alternately cross the layers along the circumference of the stator core, and c'-b' is equal to 4.

[0042] In some optional embodiments of the first aspect of the present application, c'=c+1, b'=b+1;

[0043] In some optional embodiments of the first aspect of the present application, c'=c-1, b'=b-1;

[0044] In some optional embodiments of the first aspect of the present application, b is 7 and c is 11.

[0045] In some optional embodiments of the first aspect of the present application, N is a natural number greater than 2, the stator flat wire winding has a second separated short-pitch structure, in which N is an even number greater than 2, and each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot modules in the radial direction of the stator core, each rectangular winding slot module occupies N layers of winding slots in the radial direction of the stator core and occupies three consecutively arranged winding slots in the circumferential direction of the stator core, and the two rectangular winding slot modules are offset by one winding slot in the circumferential direction of the stator core;

[0046] In each rectangular winding slot module: U-shaped conductors with a pitch of b and a pitch of c are used in all layer groups to alternately insert wires across the layers along the circumference of the stator core. U-shaped conductors with a pitch of c are also used between two adjacent layer groups to perform winding transition between the layer groups. cb is equal to 4;

[0047] Two layer groups belonging to different rectangular winding slot modules use U-shaped conductors with a pitch of c" to perform cross-layer insertion to perform winding transition between layer groups, c" = c ± 1.

[0048] In some optional embodiments of the first aspect of the present application, b is 7, c is 11, and c″ is 10 or 12.

[0049] In some optional embodiments of the first aspect of the present application, two intervals are formed between the outgoing wire structures of the three-phase flat wire winding in the circumferential direction of the stator core, and the total number of winding slots corresponding to the two intervals is M≤(Q-6L) / 2, where M is a natural number.

[0050] In some optional embodiments of the first aspect of the present application, the two intervals include a first interval and a second interval, the first interval is formed between the first-phase flat wire winding and the second-phase flat wire winding, and the second interval is formed between the second-phase flat wire winding and the third-phase flat wire winding, the number of winding slots m1 corresponding to the first interval and the number of winding slots m2 corresponding to the second interval are equal, and the sum of m1 and m2 is M.

[0051] In some optional embodiments of the first aspect of the present application, the total number of winding slots M corresponding to the two intervals satisfies Q / 4<M+3L<Q / 2.

[0052] In some optional embodiments of the first aspect of the present application, all phase outgoing wire ends of each phase flat wire winding are connected to the same outgoing wire copper bar, and the three-phase flat wire windings correspond to three outgoing wire copper bars respectively;

[0053] All phase lead ends of the three-phase flat wire winding are connected to the same star point copper bar;

[0054] The three-phase flat wire winding is connected in star or delta.

[0055] A second aspect of the present application provides a motor having the flat wire motor stator according to the first aspect of the present application.

[0056] The first aspect of the present application provides a flat wire motor stator. Based on the outgoing wire structure setting of each phase flat wire winding and the winding method of each phase flat wire winding having two parallel first branches and second branches, the outgoing wire structure of the three-phase flat wire winding is more concentrated in the circumferential direction of the stator, which simplifies the outgoing wire structure and reduces the manufacturing process and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0058] Figure 1 This is a schematic diagram of the three-dimensional structure of the flat wire motor stator in one embodiment of the present application;

[0059] Figure 2 This is a schematic diagram of the three-dimensional structure of the stator flat wire winding according to an embodiment of the present application;

[0060] Figure 3 This is a schematic diagram of the three-dimensional structure of a flat wire winding of one phase in the stator flat wire winding according to an embodiment of the present application;

[0061] Figure 4 This is a schematic structural diagram of a first U-shaped conductor according to an embodiment of the present application;

[0062] Figure 5 This is a schematic structural diagram of a second U-shaped conductor according to an embodiment of the present application;

[0063] Figure 6 This is a schematic structural diagram of a third U-shaped conductor according to an embodiment of the present application;

[0064] Figure 7 This is a schematic structural diagram of a fourth U-shaped conductor according to an embodiment of the present application;

[0065] Figure 8 This is a schematic structural diagram of a fifth U-shaped conductor according to an embodiment of the present application;

[0066] Figure 9 This is a schematic structural diagram of a sixth U-shaped conductor according to an embodiment of the present application;

[0067] Figure 10 This is a schematic structural diagram of a seventh U-shaped conductor according to an embodiment of the present application;

[0068] Figure 11 This is a schematic structural diagram of an eighth U-shaped conductor according to an embodiment of the present application;

[0069] Figure 12 This is a schematic structural diagram of a ninth U-shaped conductor according to an embodiment of the present application;

[0070] Figure 13 This is a schematic diagram of the wiring method of the first branch U1 of the U phase at the non-outgoing line end when viewed from the non-outgoing line end along the axial direction of the stator core in Example 1 of the present application;

[0071] Figure 14 This is a schematic diagram of the wiring method of the second branch U2 of the U phase at the non-outgoing line end when viewed from the non-outgoing line end along the axial direction of the stator core in Example 1 of the present application;

[0072] Figure 15 This is a schematic diagram of the wiring method of the two parallel branches of the U phase at the output end, viewed from the non-output end along the axial direction of the stator core in Example 1 of the present application;

[0073] Figure 16 This is a schematic diagram of the wiring method of the two parallel branches of the U phase at the output end, viewed from the non-output end along the axial direction of the stator core in Example 2 of the present application;

[0074] Figure 17 This is a schematic diagram of the wiring method of the two parallel branches of the U phase at the output end, viewed from the non-output end along the axial direction of the stator core in Example 3 of the present application;

[0075] Figure 18 This is a schematic diagram of the wiring method of the two parallel branches of the U phase at the output end, viewed from the non-output end along the axial direction of the stator core in Example 4 of the present application;

[0076] Figure 19 This is a schematic diagram of the wiring method of the two parallel branches of the U phase at the output end, viewed from the non-output end along the axial direction of the stator core in Example 5 of the present application;

[0077] Figure 20 This is a schematic diagram of the wiring method of the two parallel branches of the U phase at the output end, viewed from the non-output end along the axial direction of the stator core in Example 6 of the present application;

[0078] Figure 21 This is a schematic diagram of the wiring method of the two parallel branches of the U phase at the output end, viewed from the non-output end along the axial direction of the stator core in Example 7 of the present application;

[0079] Figure 22 The different colored lines in Examples 13 to 21 of the present application represent the pitches of the U-shaped conductors used.

[0080] Description of reference numerals:

[0081] Flat wire motor stator-1; stator core-11; winding slot-111; stator flat wire winding-12;

[0082] Soldering end 21; Plug-in end 22; Inverted V-shaped connection portion 221; First folded section 222; Second folded section 223; Bend structure 224; First twisted leg 231; Second twisted leg 232; First slot conductor portion 241; Second slot conductor portion 242;

[0083] First interval - 31; Second interval - 32;

[0084] Outgoing wire structure of U-phase flat wire winding - 41; Outgoing wire structure of W-phase flat wire winding - 42; Outgoing wire structure of V-phase flat wire winding - 43;

[0085] Phase outgoing line terminal-51; Phase lead terminal-52;

[0086] Outgoing copper busbar-6; Star point copper busbar-7;

[0087] a first U-shaped conductor 100 , a second U-shaped conductor 200 , a third U-shaped conductor 300 , a fourth U-shaped conductor 400 , a fifth U-shaped conductor 500 , a sixth U-shaped conductor 600 , a seventh U-shaped conductor 700 , an eighth U-shaped conductor 800 , and a ninth U-shaped conductor 900 . DETAILED DESCRIPTION

[0088] The following will be combined with the Figure 1 To the attached Figure 22 The technical solution of this application is described in detail.

[0089] like Figure 1 As shown, the present application provides a flat wire motor stator 1, comprising a stator core 11 and a stator flat wire winding 12. The stator core 11 is annular and has a plurality of winding slots 111 formed on its inner wall along its circumference. The total number Q of the winding slots 111 is a natural number and a multiple of 3. The number of layers of the winding slots 111 is 2N, where N ≥ 2.

[0090] The stator flat wire winding 12 is embedded in a plurality of winding slots 111 and comprises a three-phase flat wire winding. The number of poles P of the stator flat wire winding 12 is an even multiple of 3, the number of slots per pole per phase q is 3, and each phase flat wire winding has L parallel branches, where L is greater than or equal to 2. Each branch is connected and wound by a plurality of U-shaped conductors inserted into the winding slots 111. The U-shaped conductor has an insert end 22 and a welding end 21. The welding end 21 of the U-shaped conductor has two twisted legs outside the winding slot 111. The flat wire motor stator 1 is connected to the welding end 21.

[0091] The output structure of each phase flat wire winding is as follows: the phase output terminal 51 and the phase lead terminal 52 of each branch are arranged on the same row of twisted legs in the radial direction of the stator core 11 and correspond to any two adjacent nth and n+1th layers in the same winding slot 111, where n and n+1 are in the range of 1 to 2N. In the circumferential direction of the stator core 11, the phase output terminal 51 of each branch corresponds to a plurality of winding slots 111 arranged continuously in the nth layer, and the phase lead terminal 52 of each branch corresponds to a plurality of winding slots 111 arranged continuously in the n+1th layer.

[0092] Each phase flat wire winding has two parallel-connected first and second branches with reversely symmetrical winding patterns. The winding patterns include a U-shaped conductor arrangement and connection rule with different pitches.

[0093] The first aspect of the present application provides a flat wire motor stator 1. Based on the outgoing wire structure setting of each phase flat wire winding and the winding method of each phase flat wire winding having two parallel first branches and second branches, the outgoing wire structure of the three-phase flat wire winding is more concentrated in the circumferential direction of the stator, which simplifies the outgoing wire structure and reduces the manufacturing process and cost.

[0094] All phase outgoing wire ends of each phase flat wire winding are connected to the same outgoing wire copper bar 6, and the three-phase flat wire winding corresponds to three outgoing wire copper bars 6 respectively, that is, the outgoing wire structure 41 of the U-phase flat wire winding corresponds to one outgoing wire copper bar 6, the outgoing wire structure 42 of the W-phase flat wire winding corresponds to one outgoing wire copper bar 6, and the outgoing wire structure 43 of the V-phase flat wire winding corresponds to one outgoing wire copper bar 6.

[0095] All phase lead ends of the three-phase flat wire winding are connected to the same star point copper bar 7;

[0096] The three-phase flat wire winding is connected in star or delta.

[0097] The stator core 11 is annular, and a plurality of winding slots 111 are formed on the inner wall of the stator core 11 along its circumference. The plurality of winding slots 111 are evenly arranged along the circumference of the stator core 11. In some embodiments, the total number of winding slots 111 is 54.

[0098] Figure 2 This is a schematic three-dimensional structural diagram of the flat wire stator flat wire winding 12 structure of Example 1 of the present application.

[0099] Figure 3 Schematic diagram of the three-dimensional structure of the U-phase flat wire winding in the flat wire stator flat wire winding 12 structure of Example 1 of the present application.

[0100] like Figure 2 and Figure 3As shown, the three-phase flat wire winding includes a U-phase flat wire winding, a W-phase flat wire winding, and a V-phase flat wire winding. Each phase winding consists of at least two parallel branches, each of which is formed by connecting and winding multiple U-shaped conductors 2 inserted into winding slots 111. The U-shaped conductors 2 are inserted from the first axial end of the stator core 11, with the plug-in end 22 of the U-shaped conductor 2 corresponding to the first end. The welded end 21 of the U-shaped conductor 2 extends from the stator core 11 from the second axial end, with the welded end 21 corresponding to the second end. After the multiple U-shaped conductors 2 are slotted, the twisted legs at the welded ends 21 of the different U-shaped conductors 2 are welded together during the welding process to form a winding branch.

[0101] For ease of understanding, the technical terms appearing in the embodiments of this application are explained accordingly:

[0102] Stator: refers to the stationary part of the motor, whose function is to generate a rotating magnetic field.

[0103] Rotor: refers to the rotating part in the motor, which is used to realize the conversion of electrical energy into mechanical energy.

[0104] U-shaped conductor 2: The U-shaped conductor 2 is the smallest structural unit of a single-phase flat wire winding. The U-shaped conductor 2 is a hairpin coil formed by a twisting process and has a welding end 21 and a wire insertion end 22 in the vertical direction.

[0105] A vertical flat linear in-slot conductor portion is formed between the welding end 21 and the wire insertion end 22 . The in-slot conductor portion includes a first in-slot conductor portion 241 and a second in-slot conductor portion 242 that are spaced apart. Both the first in-slot conductor portion 241 and the second in-slot conductor portion 242 are flat linear conductors.

[0106] The twisted legs include a first twisted leg 231 and a second twisted leg 232 that are separately arranged. The first twisted leg 231 is connected to the first in-slot conductor portion 241 , and the second twisted leg 232 is connected to the second in-slot conductor portion 242 .

[0107] In some examples, the first twisted leg 231 and the second twisted leg 232 of the U-shaped conductor 2 have opposite twisting directions, and the first twisted leg 231 and the second twisted leg 232 are staggered in the winding slot 111. Staggered arrangement means that the first in-slot conductor portion 241 corresponding to the first twisted leg 231 and the second in-slot conductor portion 242 corresponding to the second twisted leg 232 are not on the same layer of the winding slot 111. Opposite twisting directions can be understood as the first twisted leg 231 and the second twisted leg 232 being arranged in a quasi-figure-eight configuration.

[0108] In other examples, the first twisted leg 231 and the second twisted leg 232 of the U-shaped conductor 2 have the same twisting direction, and the first twisted leg 231 and the second twisted leg 232 are arranged in the same layer. Here, the staggered and same-layer arrangement of the twisted legs is based on the actual position of the in-slot conductor portion connected to the twisted legs in the winding slot 111, and does not mean that the twisted legs are arranged in the winding slot 111. The same twisting direction can be understood as the first twisted leg 231 and the second twisted leg 232 are bent in more than one direction.

[0109] The plug-in terminal 22 is formed with an inverted V-shaped connection portion 221. The V-shaped connection portion includes a first folded segment 222 connected to the first slot conductor portion 241 and a second folded segment 223 connected to the second slot conductor portion 242. The connection between the first folded segment 222 and the second folded segment 223 forms a bent structure 224. The bent structure 224 has two different staggered layer directions. The first staggered layer direction is that the first folded segment 222 is closer to the centerline of the customized iron core than the second folded segment 223 at the connection point. The second staggered layer direction is that the second folded segment 223 is closer to the centerline of the customized iron core than the first folded segment 222 at the connection point. The staggered directions of the U-shaped conductors are different, so that the first slot conductor portion 241 and the second slot conductor portion 242 have different positional arrangements in the radial direction of the stator core 11. For example, one staggered direction causes the first slot conductor portion 241 to be closer to the axis of the stator core 11 than the second slot conductor portion 242, while another staggered direction causes the second slot conductor portion 242 to be closer to the axis of the stator core 11 than the first slot conductor portion 241.

[0110] Pitch: Also known as span, it refers to the distance between two slots. It also refers to the distance between two edges of the same element in a motor's flat wire winding on the armature surface. It is usually expressed by the number of winding slots 111 provided in the stator core 11. For example, if the first slot of a U-shaped conductor, conductor portion 241, is in slot 01, and the second slot, conductor portion 242, is in slot 10, the pitch is 9.

[0111] Generally, the full pitch is the number of slots / the number of poles, for example, the number of slots is 54 / the number of poles is 6=9. A pitch greater than the full pitch is a long pitch, and a pitch less than the full pitch is a short pitch.

[0112] The concept of the number of layers: Each area in the winding slot 111 corresponding to the insertion of a flat wire conductor is called a layer. The areas in the winding slot 111 radially away from the center of the stator core 11 are named the 1st layer, the 2nd layer... the 2N-1 layer and the 2N layer in sequence, where N is greater than or equal to 2.

[0113] The number of poles P is an even multiple of 3, that is, P = 6, 12, 18... and other integers.

[0114] In some optional embodiments of the first aspect of the present application, the winding is continuously performed from the outside to the inside along the circumference of the stator core 11, with the first branch forming a first winding section and the second branch forming a second winding section;

[0115] The two branches are continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, the first branch forming the third winding section, and the second branch forming the fourth winding section;

[0116] Viewed from the same winding direction, the winding method of the first winding section is the same as that of the fourth winding section, and the winding method of the third winding section is the same as that of the second winding section. The winding directions include a first direction from the phase output terminal 51 to the phase lead terminal 52 and a second direction from the phase lead terminal 52 to the phase output terminal 51.

[0117] The winding method includes U-shaped conductor arrangement and connection rules with different pitches.

[0118] In some optional embodiments of the present application, the winding slot 111 has N layer groups, each layer group has two adjacent odd layers and an even layer.

[0119] The winding methods of the second winding section include:

[0120] In each layer group, multiple U-shaped conductors with the same pitch are used for cross-layer wiring.

[0121] In some optional embodiments of the present application, a U-shaped conductor with a pitch of 8 is used at the beginning or end of the second winding section for same-layer wiring.

[0122] In some optional embodiments of the present application, N is a natural number greater than 2, and the stator flat wire winding 12 has a full-pitch structure or a cross-short structure.

[0123] U-shaped conductors with a pitch of a are used for cross-layer insertion in all layer groups, and U-shaped conductors with a pitch of a are also used between two adjacent layer groups to perform cross-layer insertion to achieve winding transition between layer groups.

[0124] In some optional embodiments of the present application, a is selected from 8, 9 or 10.

[0125] In some optional embodiments of the present application, N is a natural number greater than 2, and the stator flat wire winding 12 has a first separated short-pitch structure.

[0126] In the first separated short-pitch structure, N is an odd number greater than 2, and each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot 111 modules in the radial direction of the stator core 11. Each rectangular winding slot 111 module occupies N layers of winding slots 111 in the radial direction of the stator core 11 and occupies three consecutively arranged winding slots 111 in the circumferential direction of the stator core 11. The two rectangular winding slot 111 modules are offset by one winding slot 111 in the circumferential direction of the stator core 11.

[0127] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of a are used in all layer groups for cross-layer insertion;

[0128] The stator core 11 is radially arranged across two rectangular winding slots 111 modules, and a U-shaped conductor with a pitch of a±1 is used for cross-layer insertion.

[0129] Between every two adjacent layer groups, a U-shaped conductor with a pitch of a is used to insert wires across the layers to achieve winding transition between the layer groups.

[0130] In some optional embodiments of the present application, a is 9.

[0131] In some optional embodiments of the present application, N is a natural number greater than 2, the stator flat wire winding 12 has a second separated short-pitch structure, N in the second separated short-pitch structure is an even number greater than 2, and the phase unit of each phase flat wire winding has two consecutively arranged rectangular winding slot 111 modules in the radial direction of the stator core 11, each rectangular winding slot 111 module occupies N layers of winding slots 111 in the radial direction of the stator core 11 and occupies three consecutively arranged winding slots 111 in the circumferential direction of the stator core 11, and the two rectangular winding slot 111 modules are staggered by one winding slot 111 in the circumferential direction of the stator core 11.

[0132] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of a are used for inter-layer insertion in all layer groups, and U-shaped conductors with a pitch of a are also used between two adjacent layer groups to perform inter-layer winding transition, where a is 9;

[0133] Between two layer groups belonging to different rectangular winding slot 111 modules, a U-shaped conductor with a pitch of a' is used to perform cross-layer insertion to achieve winding transition between the layer groups.

[0134] In some optional embodiments of the present application, a' is selected from 8 or 10.

[0135] In some optional embodiments of the present application, the winding slot 111 has N layer groups, each layer group has two adjacent odd layers and an even layer.

[0136] The winding methods of the first winding section include:

[0137] In each layer group, two U-shaped conductors with a pitch difference of 4 are used to alternately cross the layers along the circumferential direction of the stator core 11.

[0138] In some optional embodiments of the present application, a U-shaped conductor with a pitch of 10 is used at the beginning or end of the first winding section for same-layer wiring.

[0139] In some optional embodiments of the present application, N is a natural number greater than 2, and the stator flat wire winding 12 has a full-pitch structure or a cross-short structure;

[0140] In all layer groups, U-shaped conductors with a pitch of b and U-shaped conductors with a pitch of c are alternately inserted across the layers along the circumference of the stator core 11. U-shaped conductors with a pitch of c are also inserted across the layers between two adjacent layer groups to perform winding transition between the layer groups. cb is equal to 4.

[0141] In some optional embodiments of the present application, b is 7 and c is 11.

[0142] In some optional embodiments of the present application, b is 8 and c is 12.

[0143] In some optional embodiments of the present application, b is 6 and c is 10.

[0144] In some optional embodiments of the present application, N is a natural number greater than 2, the stator flat wire winding 12 has a first separated short-pitch structure, N in the first separated short-pitch structure is an odd number greater than 2, and each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot 111 modules in the radial direction of the stator core 11, each rectangular winding slot 111 module occupies N layers of winding slots 111 in the radial direction of the stator core 11 and occupies three consecutively arranged winding slots 111 in the circumferential direction of the stator core 11, and the two rectangular winding slot 111 modules are offset by one winding slot 111 in the circumferential direction of the stator core 11;

[0145] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of b and U-shaped conductors with a pitch of c are alternately inserted across layers along the circumference of the stator core 11 in all layer groups. U-shaped conductors with a pitch of c are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups. cb is equal to 4;

[0146] The layer group spanning two rectangular winding slot 111 modules uses U-shaped conductors with a pitch of b' and U-shaped conductors with a pitch of c' to alternately cross the layers along the circumference of the stator core 11, and c'-b' is equal to 4.

[0147] In some optional embodiments of the present application, c'=c+1, b'=b+1.

[0148] In some optional embodiments of the present application, c'=c-1, b'=b-1.

[0149] In some optional embodiments of the present application, b is 7 and c is 11.

[0150] In some optional embodiments of the present application, N is a natural number greater than 2, the stator flat wire winding 12 has a second separated short-pitch structure, N in the second separated short-pitch structure is an even number greater than 2, and each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot 111 modules in the radial direction of the stator core 11, each rectangular winding slot 111 module occupies N layers of winding slots 111 in the radial direction of the stator core 11 and occupies three consecutively arranged winding slots 111 in the circumferential direction of the stator core 11, and the two rectangular winding slot 111 modules are offset by one winding slot 111 in the circumferential direction of the stator core 11;

[0151] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of b and U-shaped conductors with a pitch of c are alternately inserted across layers along the circumference of the stator core 11 in all layer groups. U-shaped conductors with a pitch of c are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups. cb is equal to 4;

[0152] Two layer groups belonging to different rectangular winding slot 111 modules use U-shaped conductors with a pitch of c" to perform cross-layer insertion to perform winding transition between the layer groups, where c" = c±1.

[0153] In some optional embodiments of the present application, b is 7, c is 11, and c″ is 10 or 12.

[0154] In some optional embodiments of the first aspect of the present application, two intervals are formed between the outgoing wire structures of the three-phase flat wire winding in the circumferential direction of the stator core 11, and the total number of winding slots 111 corresponding to the two intervals is M≤(Q-6L) / 2, where M is a natural number.

[0155] The outgoing wire structure of each phase flat wire winding is arranged near the outer periphery of the stator core 11, and the outgoing wire structure of the three-phase flat wire winding is concentrated in the upper half circle of the stator circumference, which simplifies the outgoing wire structure, reduces the manufacturing process and cost, avoids occupying the inner diameter space on one side of the stator, makes the installation freedom of the motor rotor higher, avoids the limitation of the outgoing wire structure on the rotor, and makes the overall machine design more flexible.

[0156] In some optional embodiments of the first aspect of the present application, the two intervals include a first interval 31 and a second interval 32, the first interval 31 is formed between the first-phase flat wire winding and the second-phase flat wire winding, and the second interval 32 is formed between the second-phase flat wire winding and the third-phase flat wire winding, the number m1 of winding slots 111 corresponding to the first interval 31 and the number m2 of winding slots 111 corresponding to the second interval 32 are equal, and the sum of m1 and m2 is M.

[0157] In some optional embodiments of the first aspect of the present application, the total number M of winding slots 111 corresponding to the two intervals satisfies Q / 4<M+3L<Q / 2.

[0158] In some optional embodiments of the present application, all phase outgoing wire ends 51 of each phase flat wire winding are connected to the same outgoing wire copper bar 6, and the three-phase flat wire windings correspond to three outgoing wire copper bars 6 respectively;

[0159] All phase lead ends 52 of the three-phase flat wire winding are connected to the same star point copper busbar;

[0160] The three-phase flat wire winding is connected in star or delta.

[0161] A second aspect of the present application provides a motor having the flat wire motor stator 1 of the first aspect of the present application.

[0162] The present application is further described in detail below through different specific implementations.

[0163] [Example 1]

[0164] In Example 1, the number of flat wire conductor layers is 6 (i.e., the number of winding slots 111 is 6). The number of slots per phase per stage q = number of slots / number of poles / number of phases. Example 1 of the present application corresponds to a 54-slot, 6-pole three-phase motor. The number of slots per pole per phase q = 54 / 6 / 3 = 3, and each flat wire winding has two parallel branches. The number of poles P is an even multiple of 3, i.e., P = 6. The number of winding slots 111 is 54.

[0165] The output wire structure of each phase flat wire winding is as follows: the phase output wire end 51 and the phase lead wire end 52 of each branch are arranged in the same row of twisted legs in the radial direction of the stator core 11 and correspond to the two adjacent sub-outer 2N-1 layers and the outermost 2N layers in the same winding slot 111. In the circumferential direction of the stator core 11, the phase output wire end 51 of each branch corresponds to a plurality of winding slots 111 arranged continuously in the 2N-1 layer, and the phase lead wire end 52 of each branch corresponds to a plurality of winding slots 111 arranged continuously in the 2N layer.

[0166] In Example 1, the connection sequence of a single-phase flat wire winding (U-phase flat wire winding) is taken as an example to illustrate the connection sequence diagram of the flat wire winding under one phase. The single-phase flat wire winding includes multiple U-shaped conductors, and the multiple U-shaped conductors specifically include:

[0167] like Figure 4 As shown, the first U-shaped conductor 100 has a pitch of 11 at the plug-in end 22, and the twisting directions of the first twisted leg 231 and the second twisted leg 232 are opposite. The first twisted leg 231 and the second twisted leg 232 are arranged in different layers, and the bending structure 224 has a second staggered direction.

[0168] like Figure 5 As shown, the second U-shaped conductor 200 has a pitch of 9 at the plug-in end 22, and the twisting directions of the first twisted leg 231 and the second twisted leg 232 are opposite. The first twisted leg 231 and the second twisted leg 232 are arranged in different layers, and the bending structure 224 has a second staggered direction.

[0169] like Figure 6 As shown, the third U-shaped conductor 300 has a wire end 22 with a pitch of 7, the first twisted leg 231 and the second twisted leg 232 have opposite twisting directions, the first twisted leg 231 and the second twisted leg 232 are arranged in different layers, and the bending structure 224 has a second staggered direction;

[0170] like Figure 7 As shown, the fourth U-shaped conductor 400 has a pitch of 11 at the plug-in end 22, and the twisting directions of the first twisted leg 231 and the second twisted leg 232 are opposite. The first twisted leg 231 and the second twisted leg 232 are arranged in different layers, and the bending structure 224 has a first staggered direction.

[0171] like Figure 8 As shown, the fifth U-shaped conductor 500 has a pitch of 9 at the plug-in end 22, and the twisting directions of the first twisted leg 231 and the second twisted leg 232 are opposite. The first twisted leg 231 and the second twisted leg 232 are arranged in different layers, and the bending structure 224 has a first staggered direction.

[0172] like Figure 9 As shown, the sixth U-shaped conductor 600 has a pitch of 10 at the plug end 22, and the first twisted leg 231 and the second twisted leg 232 have the same twisting direction and are the first twisting direction twisted to the left. The first twisted leg 231 and the second twisted leg 232 are arranged in the same layer, and the bending structure 224 has a first staggered direction.

[0173] like Figure 10 As shown, the seventh U-shaped conductor 700 has a pitch of 8 at the plug-in end 22, and the first twisted leg 231 and the second twisted leg 232 have the same twisting direction and are the first twisting direction twisted to the left. The first twisted leg 231 and the second twisted leg 232 are arranged in the same layer, and the bending structure 224 has a first staggered direction.

[0174] like Figure 11 As shown, the eighth U-shaped conductor 800 has a pitch of 10 at the plug end 22, and the first twisted leg 231 and the second twisted leg 232 have the same twist direction and are the second twist direction twisted to the right. The first twisted leg 231 and the second twisted leg 232 are arranged in the same layer, having the first staggered layer direction.

[0175] like Figure 12 As shown, the ninth type of U-shaped conductor 900 has a wire end 22 pitch of 8, the first twisted leg 231 and the second twisted leg 232 have the same twisting direction and are the second twisting direction twisted to the right, and the first twisted leg 231 and the second twisted leg 232 are arranged in the same layer.

[0176] The U-shaped conductor used in the flat wire winding of the embodiment of the present application is selected from the following Figures 4 to 12 U-shaped conductor shown.

[0177] It should be noted that the aforementioned co-layer arrangement of the first twist leg 231 and the second twist leg 232 means that the first in-slot conductor portion 241 connected to the first twist leg 231 and the second in-slot conductor portion 242 connected to the second twist leg 232 are located on the same layer after being inserted into the winding slot 111. The first twist leg 231 and the second twist leg 232 are formed outside the winding slot 111 and remain outside the winding slot 111 during welding.

[0178] Figure 13 This is a schematic diagram of the wiring method of the first branch U1 of the U phase at the non-outgoing end when viewed from the non-outgoing end along the axial direction of the stator core 11 in Example 1 of the present application. Figure 13 The non-outlet side is the side actually observed by the observer, so it is represented by a solid line; the outlet side is the part that is blocked by the observer and is represented by a dotted line. The outlet side corresponds to the welding terminal 21, and the non-outlet side corresponds to the plug-in terminal 22.

[0179] Figure 14 This is a schematic diagram of the wiring method of the second branch U2 of the U phase at the non-outgoing end when viewed from the non-outgoing end along the axial outgoing end of the stator core 11 in Example 1 of the present application. Figure 14 The non-outlet side is the side actually observed by the observer, so it is represented by a solid line; the outlet side is the part that is blocked by the observer and is represented by a dotted line. The outlet side corresponds to the welding terminal 21, and the non-outlet side corresponds to the plug-in terminal 22.

[0180] Figure 15 This is a schematic diagram of the wiring method of the two parallel branches of the U phase at the output end, viewed from the non-output end along the axial output end of the stator core 11 in Example 1 of the present application. Figure 15 The non-outlet side is the side actually observed by the observer, so it is represented by a solid line; the outlet side is the part that is blocked by the observer and is represented by a dotted line. The outlet side corresponds to the welding terminal 21, and the non-outlet side corresponds to the plug-in terminal 22.

[0181] In the first embodiment, the stator flat wire winding 12 has a full-pitch structure. The arrangement of the phase belts in the first embodiment is as follows:

[0182] In the first embodiment of the present application, three adjacent winding slots 111 constitute a phase unit. In one phase unit, conductors in all slots are in the same phase.

[0183] In Example 1 of the present application, the flat wire stator flat wire winding 12 has a structure in which the U-phase flat wire winding forms a plurality of first-phase units in the winding slots 111 of the stator core 11, the V-phase flat wire winding forms a plurality of second-phase units in the winding slots 111 of the stator core 11, and the W-phase flat wire winding forms a plurality of third-phase units in the winding slots 111 of the stator core 11. The first-phase units, second-phase units, and third-phase units are arranged in a periodic arrangement around the circumference of the stator core 11, i.e., the U-phase, V-phase, and W-phase units are arranged alternately in phase order.

[0184] In this embodiment, the outgoing wires from the welding ends 21 are in phase. q=3, the number of layers arranged in each slot of the stator core 11 is more than 4, and each phase has two parallel branches.

[0185] The connection sequence of the first branch of the U-phase flat wire winding is as follows: the U1 phase outlet 51 is the twisted leg 303 of the third U-shaped conductor 300 located in the 5th layer and 10th slot,

[0186] The twisted leg 303 of the third U-shaped conductor 300 located at the 6th layer and the 3rd slot is connected to the twisted leg 103 of the first U-shaped conductor 100 located at the 5th layer and the 48th slot.

[0187] The twisted leg 103 of the first U-shaped conductor 100 located in the 6th layer, slot 37, is connected to the twisted leg 303 of the third U-shaped conductor 300 located in the 5th layer, slot 28.

[0188] The twisted leg 303 of the third U-shaped conductor 300 located at the 6th layer and the 21st slot is connected to the twisted leg 103 of the first U-shaped conductor 100 located at the 5th layer and the 12th slot.

[0189] The twisted leg 103 of the U-shaped conductor 100 located in the 6th layer and the 1st slot is connected to the twisted leg 303 of the U-shaped conductor 300 located in the 5th layer and the 46th slot.

[0190] The twisted leg 303 of the U-shaped conductor 300 located in the 6th layer and the 39th slot is connected to the twisted leg 403 of the U-shaped conductor 400 located in the 5th layer and the 30th slot.

[0191] The twisted leg 403 of the U-shaped conductor 400 located at the 4th layer and the 19th slot is connected to the twisted leg 303 of the U-shaped conductor 300 located at the 3rd layer and the 10th slot.

[0192] The twisted leg 303 of the U-shaped conductor 300 located at the 3rd layer and the 3rd slot is connected to the twisted leg 103 of the U-shaped conductor 100 located at the 3rd layer and the 48th slot.

[0193] The twisted leg 103 of the U-shaped conductor 100 located in the 4th layer, slot 37, is connected to the twisted leg 303 of the U-shaped conductor 300 located in the 3rd layer, slot 28.

[0194] The twisted leg 303 of the U-shaped conductor 300 located at the 4th layer and the 21st slot is connected to the twisted leg 103 of the U-shaped conductor 100 located at the 3rd layer and the 12th slot.

[0195] The twisted leg 103 of the U-shaped conductor 100 located in the 4th layer and the 1st slot is connected to the twisted leg 303 of the U-shaped conductor 300 located in the 3rd layer and the 46th slot.

[0196] The twisted leg 303 of the U-shaped conductor 300 located in the 4th layer and the 39th slot is connected to the twisted leg 403 of the U-shaped conductor 400 located in the 3rd layer and the 30th slot.

[0197] The twisted leg 403 of the U-shaped conductor 400 located in the 19th slot of the second layer is connected to the twisted leg 303 of the U-shaped conductor 300 located in the 10th slot of the first layer.

[0198] The twisted leg 303 of the U-shaped conductor 300 located in the second layer and the third slot is connected to the twisted leg 103 of the U-shaped conductor 100 located in the first layer and the fourth slot.

[0199] The twisted leg 103 of the U-shaped conductor 100 located in the second layer, slot 37, is connected to the twisted leg 303 of the U-shaped conductor 300 located in the first layer, slot 28.

[0200] The twisted leg 303 of the U-shaped conductor 300 located in the 21st slot of the 2nd layer is connected to the twisted leg 103 of the U-shaped conductor 100 located in the 12th slot of the 1st layer.

[0201] The twisted leg 103 of the U-shaped conductor 100 located in the second layer and the first slot is connected to the twisted leg 303 of the U-shaped conductor 300 located in the first layer and the 46th slot.

[0202] The twisted leg 303 of the U-shaped conductor 300 located in the second layer and the 39 slots is connected to the twisted leg 803 of the U-shaped conductor 800 located in the first layer and the 30 slots.

[0203] The twisted leg 803 of the U-shaped conductor 800 located in the first layer and the 20th slot is connected to the twisted leg 203 of the U-shaped conductor 200 located in the second layer and the 29th slot.

[0204] The twisted leg 203 of the U-shaped conductor 200 located in the first layer 38 slots is connected to the twisted leg 203 of the U-shaped conductor 200 located in the second layer 47 slots.

[0205] The twisted leg 203 of the U-shaped conductor 200 located in the first layer and the second slot is connected to the twisted leg 503 of the U-shaped conductor 500 located in the second layer and the 11th slot.

[0206] The twisted leg 503 of the U-shaped conductor 500 located in the 3rd layer and the 20th slot is connected to the twisted leg 203 of the U-shaped conductor 200 located in the 4th layer and the 29th slot.

[0207] The twisted leg 203 of the U-shaped conductor 200 located in the 3rd layer 38 slot is connected to the twisted leg 203 of the U-shaped conductor 200 located in the 4th layer 47 slot.

[0208] The twisted leg 203 of the U-shaped conductor 200 located in the 3rd layer and the 2nd slot is connected to the twisted leg 503 of the U-shaped conductor 500 located in the 4th layer and the 11th slot.

[0209] The twisted leg 503 of the U-shaped conductor 500 located at the 5th layer and the 20th slot is connected to the twisted leg 203 of the U-shaped conductor 200 located at the 6th layer and the 29th slot.

[0210] The twisted leg 203 of the U-shaped conductor 200 located in the 5th layer and the 38th slot is connected to the twisted leg 203 of the U-shaped conductor 200 located in the 6th layer and the 47th slot.

[0211] The twisted leg 203 of the U-shaped conductor 200 located at the 5th layer and the 2nd slot is connected to the twisted leg 703 of the U-shaped conductor 700 located at the 6th layer and the 11th slot.

[0212] The twisted leg 703 of the U-shaped conductor 700 located in the 6th layer and the 19th slot is the U1 phase lead terminal 52.

[0213] The connection sequence of the second branch of the U-phase flat wire winding is as follows:

[0214] The U2 phase outgoing terminal 51 is the twisted leg 203 of the second U-shaped conductor 200 located at slot 11 on the 5th layer. The twisted leg 203 of the second U-shaped conductor 200 located at slot 02 on the 6th layer is connected to the twisted leg 203 of the second U-shaped conductor 200 located at slot 47 on the 5th layer.

[0215] The twisted leg 203 of the second U-shaped conductor 200 located at the 38th slot on the 6th layer is connected to the twisted leg 203 of the second U-shaped conductor 200 located at the 47th slot on the 5th layer.

[0216] The twisted leg 203 of the second U-shaped conductor 200 located in the 6th layer and the 38th slot is connected to the twisted leg 503 of the fifth U-shaped conductor 500 located in the 5th layer and the 29th slot.

[0217] The twisted leg 403 of the fifth U-shaped conductor 500 located in the 4th layer and the 20th slot is connected to the twisted leg 203 of the second U-shaped conductor 200 located in the 3rd layer and the 11th slot.

[0218] The twisted leg 203 of the second U-shaped conductor 200 located at slot 2 on the 4th layer is connected to the twisted leg 203 of the second U-shaped conductor 200 located at slot 38 on the 4th layer;

[0219] The twisted leg 203 of the second U-shaped conductor 200 located in the 4th layer, slot 38, is connected to the twisted leg 503 of the fifth U-shaped conductor 500 located in the 3rd layer, slot 29;

[0220] The twisted leg 503 of the fifth U-shaped conductor 500 located at the second layer, slot 20, is connected to the twisted leg 203 of the second U-shaped conductor 200 located at the first layer, slot 11;

[0221] The twisted leg 203 of the second U-shaped conductor 200 located in the second layer and the second slot is connected to the twisted leg 203 of the second U-shaped conductor 200 located in the first layer and the fourth slot;

[0222] The twisted leg 203 of the second U-shaped conductor 200 located in the second layer and the second slot is connected to the twisted leg 203 of the second U-shaped conductor 200 located in the first layer and the fourth slot;

[0223] The twisted leg 203 of the second U-shaped conductor 200 located in the 38th slot of the second layer is connected to the twisted leg 703 of the seventh U-shaped conductor 700 located in the 29th slot of the first layer;

[0224] The twisted leg 703 of the seventh U-shaped conductor 700 located in the 21st slot of the first layer is connected to the twisted leg 303 of the third U-shaped conductor 300 located in the 30th slot of the second layer;

[0225] The twisted leg 303 of the third U-shaped conductor 300 located in the first layer, slot 37, is connected to the twisted leg 103 of the first U-shaped conductor 100 located in the second layer, slot 46;

[0226] The twisted leg 103 of the first U-shaped conductor 100 located in the 3rd slot of the 1st layer is connected to the twisted leg 303 of the third U-shaped conductor 300 located in the 12th slot of the 2nd layer;

[0227] The twisted leg 303 of the third U-shaped conductor 300 located in the 19th slot of the first layer is connected to the twisted leg 103 of the first U-shaped conductor 100 located in the 28th slot of the second layer;

[0228] The twisted leg 303 of the first U-shaped conductor 100 located in the 19th slot of the first layer is connected to the twisted leg 303 of the third U-shaped conductor 300 located in the 28th slot of the second layer;

[0229] The twisted leg 303 of the third U-shaped conductor 300 located in the first slot of the first layer is connected to the twisted leg 403 of the fourth U-shaped conductor 400 located in the tenth slot of the second layer;

[0230] The twisted leg 403 of the fourth U-shaped conductor 400 located at the 21st slot of the 3rd layer is connected to the twisted leg 303 of the third U-shaped conductor 300 located at the 30th slot of the 4th layer;

[0231] The twisted leg 303 of the third U-shaped conductor 300 located at the 37th slot of the 3rd layer is connected to the twisted leg 103 of the first U-shaped conductor 100 located at the 46th slot of the 4th layer;

[0232] The twisted leg 103 of the first U-shaped conductor 100 located in the third slot of the second layer is connected to the twisted leg 303 of the third U-shaped conductor 300 located in the twelfth slot of the fourth layer;

[0233] The twisted leg 303 of the third U-shaped conductor 300 located at the 19th slot of the 3rd layer is connected to the twisted leg 103 of the first U-shaped conductor 100 located at the 28th slot of the 4th layer;

[0234] The twisted leg 103 of the first U-shaped conductor 100 located at the 39th slot of the 3rd layer is connected to the twisted leg 303 of the third U-shaped conductor 300 located at the 48th slot of the 4th layer;

[0235] The twisted leg 303 of the third U-shaped conductor 300 located at the 01st slot of the 3rd layer is connected to the twisted leg 403 of the fourth U-shaped conductor 400 located at the 10th slot of the 4th layer;

[0236] The twisted leg 403 of the fourth U-shaped conductor 400 located at the 21st slot of the 5th layer is connected to the twisted leg 303 of the third U-shaped conductor 300 located at the 30th slot of the 6th layer;

[0237] The twisted leg 303 of the third U-shaped conductor 300 located at the 37th slot of the 5th layer is connected to the twisted leg 103 of the first U-shaped conductor 100 located at the 46th slot of the 6th layer;

[0238] The twisted leg 103 of the first U-shaped conductor 100 located at the 3rd slot of the 5th layer is connected to the twisted leg 303 of the third U-shaped conductor 300 located at the 12th slot of the 6th layer;

[0239] The twisted leg 103 of the third U-shaped conductor 300 located at the 19th slot of the 5th layer is connected to the twisted leg 103 of the first U-shaped conductor 100 located at the 28th slot of the 6th layer;

[0240] The twisted leg 103 of the first U-shaped conductor 100 located at the 39th slot of the 5th layer is connected to the twisted leg 303 of the third U-shaped conductor 300 located at the 48th slot of the 6th layer;

[0241] The twisted leg 303 of the third U-shaped conductor 300 located at the 1st slot of the 5th layer is connected to the twisted leg 803 of the eighth U-shaped conductor 800 located at the 10th slot of the 6th layer;

[0242] The twisted leg 803 of the eighth U-shaped conductor 800 located at the 6th layer and the 20th slot is the U2 phase lead terminal 52 .

[0243] In Example 1, M is 8, that is, the total number of winding slots 111 corresponding to the two intervals is 8, and the number of winding slots 111 corresponding to the first interval 31 and the second interval 32 is 4 respectively.

[0244] In general, in Example 1 of the present application: each phase flat wire winding (Example 1 only takes the U-phase flat wire winding as an example, and the V-phase flat wire winding and the W-phase flat wire winding are wound in the same manner) has two parallel U-phase first branches and U-phase second branches with reverse symmetry in winding manner.

[0245] The stator core 11 is continuously wound from outside to inside along the circumference of the stator core 11, with the first branch forming a first winding section and the second branch forming a second winding section;

[0246] The two branches are continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, the first branch forming the third winding section, and the second branch forming the fourth winding section;

[0247] Viewed from the same winding direction, the winding method of the first winding section is the same as that of the fourth winding section, and the winding method of the third winding section is the same as that of the second winding section. The winding directions include a first direction from the phase outlet terminal 51 to the phase lead terminal 52 and a second direction from the phase lead terminal 52 to the phase outlet terminal 51. The first branch includes the first and third winding sections, and the second branch includes the second and fourth winding sections.

[0248] The first direction from the phase outlet terminal 51 to the phase lead terminal 52 is analyzed based on the winding direction:

[0249] In this first embodiment, the winding grooves 111 have six layers, forming three layer groups.

[0250] The U-phase first branch U1 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a first winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a third winding section.

[0251] The winding methods of the first winding section include:

[0252] In each layer group, U-shaped conductors with a pitch of 7 and U-shaped conductors with a pitch of 11 are alternately inserted across the layers along the circumference of the stator core 11. U-shaped conductors with a pitch of 11 are also inserted across the layers between two adjacent layer groups to achieve winding transition between the layer groups. The difference between 11 and 7 is 4.

[0253] At the end of the first winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 1, the end of the first winding section refers to the portion where the winding direction is reversed from the outermost layers (6 and 5) to the innermost layers (2 and 1), and then to the first layer, during the winding process from the phase outlet terminal 51 to the phase lead terminal 52.

[0254] The winding methods of the third winding section include:

[0255] In each layer group, multiple U-shaped conductors with the same pitch are used for cross-layer insertion, and the pitch is 9.

[0256] A U-shaped conductor with a pitch of 9 is also used between two adjacent layer groups to perform cross-layer insertion to achieve winding transition between layer groups.

[0257] At the tail end of the third winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 1, the tail end of the third winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layer group 1 and 2 to the outermost layer group 6 and 5, and then stops at the 6th layer to start the U1 phase lead terminal 52 outlet).

[0258] The U-phase second branch U2 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a second winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a fourth winding section.

[0259] The winding methods of the second winding section include:

[0260] In each layer group, multiple U-shaped conductors with the same pitch are used for cross-layer insertion, and the pitch is 9.

[0261] A U-shaped conductor with a pitch of 9 is also used between two adjacent layer groups to perform cross-layer insertion to achieve winding transition between layer groups.

[0262] At the end of the second winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 1, the end of the second winding section refers to the portion where winding is performed from the outside to the inside (i.e., from the outermost layers 6 and 5 to the innermost layers 1 and 2) during the winding process from the phase outlet terminal 51 to the phase lead terminal 52, and the winding direction is reversed at layer 1.

[0263] The winding methods of the fourth winding section include:

[0264] In each layer group, U-shaped conductors with a pitch of 7 and U-shaped conductors with a pitch of 11 are alternately inserted across the layers along the circumference of the stator core 11. U-shaped conductors with a pitch of 11 are also inserted across the layers between two adjacent layer groups to achieve winding transition between the layer groups. The difference between 11 and 7 is 4.

[0265] At the end of the fourth winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 1, the end of the fourth winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layers 1 and 2 to the outermost layers 6 and 5), where winding stops at the 6th layer and the U2 phase lead terminal 52 is connected.

[0266] It can be seen that the winding method of the first winding section of the U1 branch is the same as the winding method of the fourth winding section of the U2 branch, and the winding method of the third winding section of the U1 branch is the same as the winding method of the second winding section of the U2 branch.

[0267] [Example 2]

[0268] like Figure 16 As shown, the difference between Example 2 and Example 1 is the arrangement of the phase belts. Example 2 has a cross-short distance structure, and the output wires of the welding end 21 of Example 2 are cross-phase. The specific arrangement of the phase belts in Example 2 is as follows:

[0269] In Example 2 of the present application, each phase unit spans four winding slots 111 circumferentially around the stator core 11. In the radial direction of the stator core 11, each layer of three consecutive winding slots 111 forms a winding slot 111 group. In the radial direction of the stator core 11, three consecutive winding slots 111 in two adjacent layers, arranged from the outside to the inside, form a staggered slot unit, resulting in a total of N staggered slot units. In each staggered slot unit, the first winding slot 111 group near the outer circumference of the stator core 11 is offset by one winding slot 111 counterclockwise relative to the second winding slot 111 group farther from the outer circumference. In a phase unit, the conductors in all slots are in phase.

[0270] In Example 2: Each phase flat wire winding (Example 2 only takes the U-phase flat wire winding as an example, and the V-phase flat wire winding and the W-phase flat wire winding are wound in the same manner) has two parallel U-phase first branches and U-phase second branches with reverse symmetry in winding manner.

[0271] The stator core 11 is continuously wound from outside to inside along the circumference of the stator core 11, with the first branch forming a first winding section and the second branch forming a second winding section;

[0272] The two branches are continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, the first branch forming the third winding section, and the second branch forming the fourth winding section;

[0273] Viewed from the same winding direction, the winding method of the first winding section is the same as that of the fourth winding section, and the winding method of the third winding section is the same as that of the second winding section. The winding directions include a first direction from the phase outlet terminal 51 to the phase lead terminal 52 and a second direction from the phase lead terminal 52 to the phase outlet terminal 51. The first branch includes the first and third winding sections, and the second branch includes the second and fourth winding sections.

[0274] The first direction from the phase outlet terminal 51 to the phase lead terminal 52 is analyzed based on the winding direction:

[0275] In this second embodiment, the winding grooves 111 have six layers, forming three layer groups.

[0276] The U-phase first branch U1 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a first winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a third winding section.

[0277] The winding methods of the first winding section include:

[0278] In each layer group, U-shaped conductors with a pitch of 8 and U-shaped conductors with a pitch of 12 are alternately inserted across the layers along the circumference of the stator core 11. U-shaped conductors with a pitch of 12 are also inserted across the layers between two adjacent layer groups to achieve winding transition between the layer groups. The difference between 12 and 8 equals 4.

[0279] At the end of the first winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 2, the end of the first winding section refers to the portion where, during the winding process from the phase outlet terminal 51 to the phase lead terminal 52, the winding direction is reversed from the outermost layer groups of 6 and 5 to the innermost layer groups of 2 and 1, and then to the first layer.

[0280] The winding methods of the third winding section include:

[0281] In each layer group, multiple U-shaped conductors with the same pitch are used for cross-layer insertion, and the pitch is 10.

[0282] A U-shaped conductor with a pitch of 10 is also used between two adjacent layer groups to perform cross-layer insertion to achieve winding transition between layer groups.

[0283] At the tail end of the third winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 2, the tail end of the third winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layer group 1 and 2 to the outermost layer group 6 and 5, and then stops at the 6th layer to start the U1 phase lead terminal 52 outlet).

[0284] The U-phase second branch U2 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a second winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a fourth winding section.

[0285] The winding methods of the second winding section include:

[0286] In each layer group, multiple U-shaped conductors with the same pitch are used for cross-layer insertion, and the pitch is 10.

[0287] A U-shaped conductor with a pitch of 10 is also used between two adjacent layer groups to perform cross-layer insertion to achieve winding transition between layer groups.

[0288] At the end of the second winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 2, the end of the second winding section refers to the portion where winding is performed from the outside to the inside (i.e., from the outermost layers 6 and 5 to the innermost layers 1 and 2) during the winding process from the phase outlet terminal 51 to the phase lead terminal 52, and the winding direction is reversed at layer 1.

[0289] The winding methods of the fourth winding section include:

[0290] In each layer group, U-shaped conductors with a pitch of 8 and U-shaped conductors with a pitch of 12 are alternately inserted across the layers along the circumference of the stator core 11. U-shaped conductors with a pitch of 12 are also inserted across the layers between two adjacent layer groups to achieve winding transition between the layer groups. The difference between 12 and 8 equals 4.

[0291] At the end of the fourth winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 2, the end of the fourth winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layers 1 and 2 to the outermost layers 6 and 5), where winding stops at the 6th layer and the U2 phase lead terminal 52 is connected.

[0292] It can be seen that the winding method of the first winding section of the U1 branch is the same as the winding method of the fourth winding section of the U2 branch, and the winding method of the third winding section of the U1 branch is the same as the winding method of the second winding section of the U2 branch.

[0293] The winding of the different shapes of U-shaped conductors used in Example 2 can be referred to Example 1. The difference is the specific pitch of the U-shaped conductors, so it will not be repeated here.

[0294] [Example 3]

[0295] like Figure 17 As shown, embodiment 3 has a cross short distance structure, and the wires coming out of the welding end 21 of embodiment 3 are cross-phased. The specific phase belt arrangement of embodiment 3 is as follows:

[0296] In Example 3 of the present application, each phase unit spans four winding slots 111 circumferentially around the stator core 11. In the radial direction of the stator core 11, each layer of three consecutive winding slots 111 forms a winding slot 111 group. In the radial direction of the stator core 11, three consecutive winding slots 111 in two adjacent layers, arranged from the outside to the inside, form a staggered slot unit, resulting in a total of N staggered slot units. In each staggered slot unit, the first winding slot 111 group near the outer circumference of the stator core 11 is offset by one winding slot 111 in the clockwise direction relative to the second winding slot 111 group farther from the outer circumference. In a phase unit, the conductors in all slots are in phase.

[0297] In Example 3: Each phase flat wire winding (Example 3 only takes the U-phase flat wire winding as an example, and the V-phase flat wire winding and the W-phase flat wire winding are wound in the same manner) has two parallel U-phase first branches and U-phase second branches with reverse symmetry in winding manner.

[0298] The stator core 11 is continuously wound from outside to inside along the circumference of the stator core 11, with the first branch forming a first winding section and the second branch forming a second winding section;

[0299] The two branches are continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, the first branch forming the third winding section, and the second branch forming the fourth winding section;

[0300] Viewed from the same winding direction, the winding method of the first winding section is the same as that of the fourth winding section, and the winding method of the third winding section is the same as that of the second winding section. The winding directions include a first direction from the phase outlet terminal 51 to the phase lead terminal 52 and a second direction from the phase lead terminal 52 to the phase outlet terminal 51. The first branch includes the first and third winding sections, and the second branch includes the second and fourth winding sections.

[0301] The first direction from the phase outlet terminal 51 to the phase lead terminal 52 is analyzed based on the winding direction:

[0302] In this third embodiment, the winding grooves 111 have six layers, forming three layer groups.

[0303] The U-phase first branch U1 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a first winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a third winding section.

[0304] The winding methods of the first winding section include:

[0305] In each layer group, U-shaped conductors with a pitch of 6 and U-shaped conductors with a pitch of 10 are alternately inserted across the layers along the circumference of the stator core 11. U-shaped conductors with a pitch of 10 are also inserted across the layers between two adjacent layer groups to achieve winding transition between the layer groups. The difference between 10 and 6 is 4.

[0306] At the end of the first winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 3, the end of the first winding section refers to the portion where the winding direction is reversed from the outermost layers (6 and 5) to the innermost layers (2 and 1), and then to the first layer, during the winding process from the phase outlet terminal 51 to the phase lead terminal 52.

[0307] The winding methods of the third winding section include:

[0308] In each layer group, multiple U-shaped conductors with the same pitch are used for cross-layer insertion, and the pitch is 8.

[0309] A U-shaped conductor with a pitch of 8 is also used between two adjacent layer groups to perform cross-layer insertion to achieve winding transition between layer groups.

[0310] At the tail end of the third winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 3, the tail end of the third winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layers 1 and 2 to the outermost layers 6 and 5, and then stops at the 6th layer to start the U1 phase lead terminal 52 outlet).

[0311] The U-phase second branch U2 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a second winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a fourth winding section.

[0312] The winding methods of the second winding section include:

[0313] In each layer group, multiple U-shaped conductors with the same pitch are used for cross-layer insertion, and the pitch is 8.

[0314] A U-shaped conductor with a pitch of 8 is also used between two adjacent layer groups to perform cross-layer insertion to achieve winding transition between layer groups.

[0315] At the end of the second winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 3, the end of the second winding section refers to the portion where winding is performed from the outside to the inside (i.e., from the outermost layers 6 and 5 to the innermost layers 1 and 2) during the winding process from the phase outlet terminal 51 to the phase lead terminal 52, and the winding direction is reversed at layer 1.

[0316] The winding methods of the fourth winding section include:

[0317] In each layer group, U-shaped conductors with a pitch of 6 and U-shaped conductors with a pitch of 10 are alternately inserted across the layers along the circumference of the stator core 11. U-shaped conductors with a pitch of 10 are also inserted across the layers between two adjacent layer groups to achieve winding transition between the layer groups. The difference between 10 and 6 is 4.

[0318] At the end of the fourth winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 3, the end of the fourth winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layers 1 and 2 to the outermost layers 6 and 5), where winding stops at the 6th layer and the U2 phase lead terminal 52 is connected.

[0319] It can be seen that the winding method of the first winding section of the U1 branch is the same as the winding method of the fourth winding section of the U2 branch, and the winding method of the third winding section of the U1 branch is the same as the winding method of the second winding section of the U2 branch.

[0320] The winding of the different shapes of U-shaped conductors used in Example 3 can be referred to Example 1. The difference is the specific pitch of the U-shaped conductors, so it will not be repeated here.

[0321] [Example 4]

[0322] like Figure 18 As shown, the difference between Example 4 and Example 1 is the arrangement of the phase belts. Example 4 has a first separation short distance structure, and the welding end 21 of Example 4 is separated and out of phase. The specific arrangement of the phase belts in Example 4 is as follows:

[0323] In the first separated short-pitch structure, N is an odd number greater than 2. Each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot 111 modules in the radial direction of the stator core 11. Each rectangular winding slot 111 module occupies N winding slot 111 layers in the radial direction of the stator core 11 and occupies three consecutively arranged winding slots 111 circumferentially of the stator core 11. The two rectangular winding slot 111 modules are offset by one winding slot 111 circumferentially of the stator core 11. In this embodiment, N is 3, and the number of layers is 6; N can also be 5, 7, etc.

[0324] Each phase unit spans four winding slots 111 in the circumferential direction of the stator core 11. In the radial direction of the stator core 11, each layer of three consecutive winding slots 111 forms a winding slot 111 group. M layers of M winding slot 111 groups, connected from the outside to the inside in the radial direction of the stator core 11, are aligned in the circumferential direction of the stator core 11 to form two rectangular winding slot 111 modules: a first rectangular winding slot 111 module close to the outer circumference of the stator core 11, and a second rectangular winding slot 111 module away from the outer circumference of the stator core 11. The second rectangular winding slot 111 module is offset by one winding slot 111 in the clockwise direction from the first rectangular winding slot 111 module. In a phase unit, the conductors in all slots in the first and second rectangular winding slot 111 modules are in phase.

[0325] In Example 4: each phase flat wire winding (Example 4 only takes the U-phase flat wire winding as an example, and the V-phase flat wire winding and the W-phase flat wire winding are wound in the same manner) has two parallel U-phase first branches and U-phase second branches with reverse symmetry in winding manner.

[0326] The stator core 11 is continuously wound from outside to inside along the circumference of the stator core 11, with the first branch forming a first winding section and the second branch forming a second winding section;

[0327] The two branches are continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, the first branch forming the third winding section, and the second branch forming the fourth winding section;

[0328] Viewed from the same winding direction, the winding method of the first winding section is the same as that of the fourth winding section, and the winding method of the third winding section is the same as that of the second winding section. The winding directions include a first direction from the phase outlet terminal 51 to the phase lead terminal 52 and a second direction from the phase lead terminal 52 to the phase outlet terminal 51. The first branch includes the first and third winding sections, and the second branch includes the second and fourth winding sections.

[0329] The first direction from the phase outlet terminal 51 to the phase lead terminal 52 is analyzed based on the winding direction:

[0330] In this fourth embodiment, the winding grooves 111 have six layers, forming three layer groups.

[0331] The U-phase first branch U1 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a first winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a third winding section.

[0332] The winding methods of the first winding section include:

[0333] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 11 and U-shaped conductors with a pitch of 7 are alternately inserted across layers along the circumference of the stator core 11 in all layer groups. U-shaped conductors with a pitch of 7 are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups. 11-7 equals 4;

[0334] The layer group spanning two rectangular winding slots 111 modules uses U-shaped conductors with a pitch of 8 and U-shaped conductors with a pitch of 12 to alternately cross the layers along the circumference of the stator core 11, where 12-8 equals 4;

[0335] At the end of the first winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 4, the end of the first winding section refers to the portion where the winding direction is reversed from the outermost layers (6 and 5) to the innermost layers (2 and 1), and then to the first layer, during the winding process from the phase outlet terminal 51 to the phase lead terminal 52.

[0336] The winding methods of the third winding section include:

[0337] In each rectangular winding slot 111 module: all layer groups use U-shaped conductors with a pitch of 9 for cross-layer insertion;

[0338] The stator core 11 is radially arranged across the layer group of two rectangular winding slots 111 modules using a U-shaped conductor with a pitch of 10 for cross-layer insertion;

[0339] Between every two adjacent layer groups, a U-shaped conductor with a pitch of 9 is used to insert wires across the layers to achieve winding transition between the layer groups.

[0340] At the tail end of the third winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 4, the tail end of the third winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layer group 1 and 2 to the outermost layer group 6 and 5, and then stops at the 6th layer to start the U1 phase lead terminal 52 outlet).

[0341] The U-phase second branch U2 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a second winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a fourth winding section.

[0342] The winding methods of the second winding section include:

[0343] Multiple U-shaped conductors with the same pitch are used in all layer groups for cross-layer insertion, and the pitch is 9.

[0344] A U-shaped conductor with a pitch of 9 is also used between two adjacent layer groups to perform cross-layer insertion to achieve winding transition between layer groups.

[0345] At the end of the second winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 4, the end of the second winding section refers to the portion where winding is performed from the outside to the inside (i.e., from the outermost layers 6 and 5 to the innermost layers 1 and 2) during the winding process from the phase outlet terminal 51 to the phase lead terminal 52, and the winding direction is reversed at layer 1.

[0346] The winding methods of the fourth winding section include:

[0347] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 11 and U-shaped conductors with a pitch of 7 are alternately inserted across layers along the circumference of the stator core 11 in all layer groups. U-shaped conductors with a pitch of 11 are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups. 11-7 equals 4;

[0348] The layer group spanning two rectangular winding slots 111 modules uses U-shaped conductors with a pitch of 8 and U-shaped conductors with a pitch of 12 to alternately cross the layers along the circumference of the stator core 11, where 12-8 equals 4;

[0349] At the end of the fourth winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 4, the end of the fourth winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layers 1 and 2 to the outermost layers 6 and 5), where winding stops at the 6th layer and the U2 phase lead terminal 52 is connected.

[0350] It can be seen that the winding method of the first winding section of the U1 branch is the same as the winding method of the fourth winding section of the U2 branch, and the winding method of the third winding section of the U1 branch is the same as the winding method of the second winding section of the U2 branch.

[0351] The winding of the different shapes of U-shaped conductors used in Example 4 can be referred to Example 1. The difference is the specific pitch of the U-shaped conductors, so it will not be repeated here.

[0352] [Example 5]

[0353] like Figure 19 As shown, the difference between Example 5 and Example 1 is the arrangement of the phase belts. Example 5 has a first separation short distance structure, and the welding end 21 of Example 5 is separated and out of phase. The specific arrangement of the phase belts in Example 5 is as follows:

[0354] In the first separated short-pitch structure, N is an odd number greater than 2. Each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot 111 modules in the radial direction of the stator core 11. Each rectangular winding slot 111 module occupies N winding slot 111 layers in the radial direction of the stator core 11 and occupies three consecutively arranged winding slots 111 circumferentially of the stator core 11. The two rectangular winding slot 111 modules are offset by one winding slot 111 circumferentially of the stator core 11. In this embodiment, N is 3, and the number of layers is 6; N can also be 5, 7, etc.

[0355] In Example 5 of the present application, each phase unit spans four winding slots 111 in the circumferential direction of the stator core 11, and in the radial direction of the stator core 11, each layer of three consecutive winding slots 111 forms a winding slot 111 group. M layers of M winding slot 111 groups connected from the outside to the inside in the radial direction of the stator core 11 are aligned in the circumferential direction of the stator core 11 to form two rectangular winding slot 111 modules, namely a first rectangular winding slot 111 module close to the outer circumference of the stator core 11 and a second rectangular winding slot 111 module away from the outer circumference of the stator core 11. The second rectangular winding slot 111 module is offset by one winding slot 111 in the counterclockwise direction relative to the first rectangular winding slot 111 module. In a phase unit, the conductor portions in all slots in the first rectangular winding slot 111 module and the second rectangular winding slot 111 module are in phase.

[0356] In Example 5: each phase flat wire winding (Example 5 only takes the U-phase flat wire winding as an example, and the V-phase flat wire winding and the W-phase flat wire winding are wound in the same manner) has two parallel U-phase first branches and U-phase second branches with reverse symmetry in winding manner.

[0357] The stator core 11 is continuously wound from outside to inside along the circumference of the stator core 11, with the first branch forming a first winding section and the second branch forming a second winding section;

[0358] The two branches are continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, the first branch forming the third winding section, and the second branch forming the fourth winding section;

[0359] Viewed from the same winding direction, the winding method of the first winding section is the same as that of the fourth winding section, and the winding method of the third winding section is the same as that of the second winding section. The winding directions include a first direction from the phase outlet terminal 51 to the phase lead terminal 52 and a second direction from the phase lead terminal 52 to the phase outlet terminal 51. The first branch includes the first and third winding sections, and the second branch includes the second and fourth winding sections.

[0360] The first direction from the phase outlet terminal 51 to the phase lead terminal 52 is analyzed based on the winding direction:

[0361] In this fifth embodiment, the winding grooves 111 have six layers, forming three layer groups.

[0362] The U-phase first branch U1 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a first winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a third winding section.

[0363] The winding methods of the first winding section include:

[0364] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 11 and U-shaped conductors with a pitch of 7 are alternately inserted across layers along the circumference of the stator core 11 in all layer groups. U-shaped conductors with a pitch of 11 are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups. 11-7 equals 4;

[0365] The layer group spanning two rectangular winding slots 111 modules uses U-shaped conductors with a pitch of 6 and U-shaped conductors with a pitch of 10 to alternately cross the layers along the circumference of the stator core 11, where 10-6 is equal to 4;

[0366] At the end of the first winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 5, the end of the first winding section refers to the portion where the winding direction is reversed from the outermost layers (6 and 5) to the innermost layers (2 and 1), and then to the first layer, during the winding process from the phase outlet terminal 51 to the phase lead terminal 52.

[0367] The winding methods of the third winding section include:

[0368] In each rectangular winding slot 111 module: all layer groups use U-shaped conductors with a pitch of 9 for cross-layer insertion;

[0369] The stator core 11 is radially arranged across the layer group of two rectangular winding slots 111 modules using a U-shaped conductor with a pitch of 8 for cross-layer insertion;

[0370] Between every two adjacent layer groups, a U-shaped conductor with a pitch of 9 is used to insert wires across the layers to achieve winding transition between the layer groups.

[0371] At the end of the third winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 5, the end of the third winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layer group 1 and 2 to the outermost layer group 6 and 5, and then stops at the 6th layer to start the U1 phase lead terminal 52 outlet).

[0372] The U-phase second branch U2 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a second winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a fourth winding section.

[0373] The winding methods of the second winding section include:

[0374] Multiple U-shaped conductors with the same pitch are used in all layer groups for cross-layer insertion, and the pitch is 9.

[0375] A U-shaped conductor with a pitch of 9 is also used between two adjacent layer groups to perform cross-layer insertion to achieve winding transition between layer groups.

[0376] At the end of the second winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 5, the end of the second winding section refers to the portion where winding is performed from the outside to the inside (i.e., from the outermost layers 6 and 5 to the innermost layers 1 and 2) during the winding process from the phase outlet terminal 51 to the phase lead terminal 52, and the winding direction is reversed at layer 1.

[0377] The winding methods of the fourth winding section include:

[0378] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 11 and U-shaped conductors with a pitch of 7 are alternately inserted across layers along the circumference of the stator core 11 in all layer groups. U-shaped conductors with a pitch of 11 are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups. 11-7 equals 4;

[0379] The layer group spanning two rectangular winding slots 111 modules uses U-shaped conductors with a pitch of 6 and U-shaped conductors with a pitch of 10 to alternately cross the layers along the circumference of the stator core 11, where 10-6 is equal to 4;

[0380] At the end of the fourth winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 5, the end of the fourth winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layers 1 and 2 to the outermost layers 6 and 5), where winding stops at the 6th layer and the U2 phase lead terminal 52 is connected.

[0381] It can be seen that the winding method of the first winding section of the U1 branch is the same as the winding method of the fourth winding section of the U2 branch, and the winding method of the third winding section of the U1 branch is the same as the winding method of the second winding section of the U2 branch.

[0382] The winding of the different shapes of U-shaped conductors used in Example 5 can be referred to Example 1. The difference is the specific pitch of the U-shaped conductors, so it will not be repeated here.

[0383] [Example 6]

[0384] like Figure 20 As shown, the difference between Example 6 and Example 1 is the arrangement of the phase belts. Example 6 has a second separation short distance structure, and the welding end 21 of Example 6 is separated and out of phase. The specific arrangement of the phase belts in Example 6 is as follows:

[0385] N is a natural number greater than 2, and the stator flat wire winding 12 has a second separated short-pitch structure. In this second separated short-pitch structure, N is an even number greater than 2. Each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot 111 modules in the radial direction of the stator core 11. Each of the rectangular winding slot 111 modules occupies N layers of winding slots 111 in the radial direction of the stator core 11 and occupies three consecutively arranged winding slots 111 in the circumferential direction of the stator core 11. The two rectangular winding slot 111 modules are offset by one winding slot 111 in the circumferential direction of the stator core 11. In the embodiment of the present application, N is equal to 4, and the number of layers is 8; in other examples, the number of layers can also be 12, 16, etc.

[0386] In Example 6 of the present application, each phase unit spans four winding slots 111 in the circumferential direction of the stator core 11, and each layer of three consecutive winding slots 111 in the radial direction of the stator core 11 forms a winding slot 111 group. M layers of M winding slot 111 groups connected from the outside to the inside in the radial direction of the stator core 11 are aligned in the circumferential direction of the stator core 11 to form two rectangular winding slot 111 modules, namely a first rectangular winding slot 111 module close to the outer circumference of the stator core 11 and a second rectangular winding slot 111 module away from the outer circumference of the stator core 11. The second rectangular winding slot 111 module is offset by one winding slot 111 in the clockwise direction relative to the first rectangular winding slot 111 module. In a phase unit, the conductor portions in all slots in the first rectangular winding slot 111 module and the second rectangular winding slot 111 module are in phase.

[0387] In Example 6: each phase flat wire winding (Example 6 only takes the U-phase flat wire winding as an example, and the V-phase flat wire winding and the W-phase flat wire winding are wound in the same manner) has two parallel U-phase first branches and U-phase second branches with reverse symmetry in winding manner.

[0388] The stator core 11 is continuously wound from outside to inside along the circumference of the stator core 11, with the first branch forming a first winding section and the second branch forming a second winding section;

[0389] The two branches are continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, the first branch forming the third winding section, and the second branch forming the fourth winding section;

[0390] Viewed from the same winding direction, the winding method of the first winding section is the same as that of the fourth winding section, and the winding method of the third winding section is the same as that of the second winding section. The winding directions include a first direction from the phase outlet terminal 51 to the phase lead terminal 52 and a second direction from the phase lead terminal 52 to the phase outlet terminal 51. The first branch includes the first and third winding sections, and the second branch includes the second and fourth winding sections.

[0391] The first direction from the phase outlet terminal 51 to the phase lead terminal 52 is analyzed based on the winding direction:

[0392] In this sixth embodiment, the winding grooves 111 have eight layers, forming four layer groups.

[0393] The U-phase first branch U1 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a first winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a third winding section.

[0394] The winding methods of the first winding section include:

[0395] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 11 and U-shaped conductors with a pitch of 7 are alternately inserted across layers along the circumference of the stator core 11 in all layer groups. U-shaped conductors with a pitch of 11 are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups. cb is equal to 4;

[0396] Two layer groups belonging to different modules of the rectangular winding slot 111 use U-shaped conductors with a pitch of 10 to perform cross-layer insertion to perform winding transition between the layer groups, where 10=11-1.

[0397] At the end of the first winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 6, the end of the first winding section refers to the portion where the winding direction is reversed from the outermost layers (6 and 5) to the innermost layers (2 and 1), and then to the first layer, during the winding process from the phase outlet terminal 51 to the phase lead terminal 52.

[0398] The winding methods of the third winding section include:

[0399] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 9 are used for inter-layer insertion in all layer groups, and U-shaped conductors with a pitch of 9 are also used between two adjacent layer groups to perform inter-layer winding transition;

[0400] Between the two layer groups belonging to different rectangular winding slot 111 modules, a U-shaped conductor with a pitch of 8 is used to perform cross-layer insertion to achieve winding transition between the layer groups;

[0401] At the end of the third winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 6, the end of the third winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layers 1 and 2 to the outermost layers 6 and 5, and then stops at the 6th layer to start the U1 phase lead terminal 52 output).

[0402] The U-phase second branch U2 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a second winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a fourth winding section.

[0403] The winding methods of the second winding section include:

[0404] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 9 are used for inter-layer insertion in all layer groups, and U-shaped conductors with a pitch of 9 are also used between two adjacent layer groups to perform inter-layer winding transition;

[0405] Between the two layer groups belonging to different rectangular winding slot 111 modules, a U-shaped conductor with a pitch of 8 is used to perform cross-layer insertion to achieve winding transition between the layer groups;

[0406] At the end of the second winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 6, the end of the second winding section refers to the portion where winding is performed from the outside to the inside (i.e., from the outermost layers 6 and 5 to the innermost layers 1 and 2) during the winding process from the phase outlet terminal 51 to the phase lead terminal 52, and the winding direction is reversed at layer 1.

[0407] The winding methods of the fourth winding section include:

[0408] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 11 and U-shaped conductors with a pitch of 7 are alternately inserted across layers along the circumference of the stator core 11 in all layer groups. U-shaped conductors with a pitch of 11 are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups. cb is equal to 4;

[0409] Two layer groups belonging to different modules of the rectangular winding slot 111 use U-shaped conductors with a pitch of 10 to perform cross-layer insertion to perform winding transition between the layer groups, where 10=11-1.

[0410] At the end of the fourth winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 6, the end of the fourth winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layers 1 and 2 to the outermost layers 6 and 5), where winding stops at the 6th layer and the U2 phase lead terminal 52 is connected.

[0411] It can be seen that the winding method of the first winding section of the U1 branch is the same as the winding method of the fourth winding section of the U2 branch, and the winding method of the third winding section of the U1 branch is the same as the winding method of the second winding section of the U2 branch.

[0412] The winding of the different shapes of U-shaped conductors used in Example 6 can be referred to Example 1. The difference is the specific pitch of the U-shaped conductors, so it will not be repeated here.

[0413] [Example 7]

[0414] like Figure 21 As shown, the difference between Example 7 and Example 1 is the arrangement of the phase belts. Example 7 has a second separation short distance structure, and the welding end 21 of Example 7 is separated and out of phase. The specific arrangement of the phase belts in Example 6 is as follows:

[0415] N is a natural number greater than 2. The stator flat wire winding 12 has a second separated short-pitch structure. In this second separated short-pitch structure, N is an even number greater than 2. Each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot 111 modules in the radial direction of the stator core 11. Each rectangular winding slot 111 module occupies N layers of winding slots 111 in the radial direction of the stator core 11 and occupies three consecutively arranged winding slots 111 in the circumferential direction of the stator core 11. The two rectangular winding slot 111 modules are offset by one winding slot 111 in the circumferential direction of the stator core 11. In the embodiment of the present application, N is equal to 4, and the number of layers is 8; in other examples, the number of layers can also be 12, 16, etc.

[0416] In Example 7 of the present application, each phase unit spans four winding slots 111 in the circumferential direction of the stator core 11, and in the radial direction of the stator core 11, each layer of three consecutive winding slots 111 forms a winding slot 111 group. M layers of M winding slot 111 groups connected from the outside to the inside in the radial direction of the stator core 11 are aligned in the circumferential direction of the stator core 11 to form two rectangular winding slot 111 modules, namely a first rectangular winding slot 111 module close to the outer circumference of the stator core 11 and a second rectangular winding slot 111 module away from the outer circumference of the stator core 11. The second rectangular winding slot 111 module is offset by one winding slot 111 in the counterclockwise direction from the first rectangular winding slot 111 module. In a phase unit, the conductor portions in all slots in the first rectangular winding slot 111 module and the second rectangular winding slot 111 module are in phase.

[0417] In Example 7: each phase flat wire winding (Example 7 only takes the U-phase flat wire winding as an example, and the V-phase flat wire winding and the W-phase flat wire winding are wound in the same manner) has two parallel U-phase first branches and U-phase second branches with reverse symmetry in winding manner.

[0418] The stator core 11 is continuously wound from outside to inside along the circumference of the stator core 11, with the first branch forming a first winding section and the second branch forming a second winding section;

[0419] The two branches are continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, the first branch forming the third winding section, and the second branch forming the fourth winding section;

[0420] Viewed from the same winding direction, the winding method of the first winding section is the same as that of the fourth winding section, and the winding method of the third winding section is the same as that of the second winding section. The winding directions include a first direction from the phase outlet terminal 51 to the phase lead terminal 52 and a second direction from the phase lead terminal 52 to the phase outlet terminal 51. The first branch includes the first and third winding sections, and the second branch includes the second and fourth winding sections.

[0421] The first direction from the phase outlet terminal 51 to the phase lead terminal 52 is analyzed based on the winding direction:

[0422] In this seventh embodiment, the winding grooves 111 have eight layers, forming four layer groups.

[0423] The U-phase first branch U1 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a first winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the first branch forms a third winding section.

[0424] The winding methods of the first winding section include:

[0425] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 11 and U-shaped conductors with a pitch of 7 are alternately inserted across layers along the circumference of the stator core 11 in all layer groups. U-shaped conductors with a pitch of 11 are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups. 11-7 equals 4;

[0426] Two layer groups belonging to different modules of the rectangular winding slot 111 use U-shaped conductors with a pitch of 12 to perform cross-layer insertion to perform winding transition between the layer groups, where 12=11+1.

[0427] At the end of the first winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 7, the end of the first winding section refers to the portion where the winding direction is reversed from the outermost layers (6 and 5) to the innermost layers (2 and 1), and then to the first layer, during the winding process from the phase outlet terminal 51 to the phase lead terminal 52.

[0428] The winding methods of the third winding section include:

[0429] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 9 are used for inter-layer insertion in all layer groups, and U-shaped conductors with a pitch of 9 are also used between two adjacent layer groups to perform inter-layer winding transition;

[0430] Between the two layer groups belonging to different rectangular winding slot 111 modules, a U-shaped conductor with a pitch of 10 is used to perform cross-layer insertion to achieve winding transition between the layer groups;

[0431] At the tail end of the third winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 7, the tail end of the third winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layer group 1 and 2 to the outermost layer group 6 and 5, and then stops at the 6th layer to start the U1 phase lead terminal 52 outlet).

[0432] The U-phase second branch U2 is continuously wound from the outside to the inside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a second winding section. It is continuously wound from the inside to the outside of the stator core 11 along the circumference of the stator core 11, and the second branch forms a fourth winding section.

[0433] The winding methods of the second winding section include:

[0434] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 9 are used for inter-layer insertion in all layer groups, and U-shaped conductors with a pitch of 9 are also used between two adjacent layer groups to perform inter-layer winding transition;

[0435] Between the two layer groups belonging to different rectangular winding slot 111 modules, a U-shaped conductor with a pitch of 10 is used to perform cross-layer insertion to achieve winding transition between the layer groups;

[0436] At the end of the second winding section, a U-shaped conductor with a pitch of 8 is used for same-layer insertion. In Example 7, the end of the second winding section refers to the portion where winding is performed from the outside to the inside (i.e., from the outermost layers 6 and 5 to the innermost layers 1 and 2) during the winding process from the phase outlet terminal 51 to the phase lead terminal 52, and the winding direction is reversed at layer 1.

[0437] The winding methods of the fourth winding section include:

[0438] In each rectangular winding slot 111 module: U-shaped conductors with a pitch of 11 and U-shaped conductors with a pitch of 7 are alternately inserted across layers along the circumference of the stator core 11 in all layer groups. U-shaped conductors with a pitch of 11 are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups. 11-7 equals 4;

[0439] Two layer groups belonging to different modules of the rectangular winding slot 111 use U-shaped conductors with a pitch of 12 to perform cross-layer insertion to perform winding transition between the layer groups, where 12=11+1.

[0440] At the end of the fourth winding section, a U-shaped conductor with a pitch of 10 is used for same-layer insertion. In Example 7, the end of the fourth winding section refers to the portion of the winding process from the phase outlet terminal 51 to the phase lead terminal 52, which is wound from the inside out (i.e., from the innermost layers 1 and 2 to the outermost layers 6 and 5), where winding stops at the 6th layer and the U2 phase lead terminal 52 is connected.

[0441] It can be seen that the winding method of the first winding section of the U1 branch is the same as the winding method of the fourth winding section of the U2 branch, and the winding method of the third winding section of the U1 branch is the same as the winding method of the second winding section of the U2 branch.

[0442] The winding of the U-shaped conductors of different shapes used in Example 7 can be referred to Example 1. The difference lies in the specific pitch of the U-shaped conductors, so it will not be described in detail.

[0443] like Figure 22 As shown, Figures 13 to 21 The line segments of different colors at the non-outlet end represent U-shaped conductors of different pitches.

[0444] The flat wire motor stator 1 provided in the present embodiment utilizes a rationally arranged winding structure, allowing for concentrated wire output within a relatively small area. This results in a simple structure, ease of production, and high efficiency. Furthermore, the winding end structure does not occupy the inner diameter space on one side of the stator, eliminating rotor installation limitations and providing greater flexibility in overall machine design.

[0445] The motor provided in the embodiment of the present application simplifies the manufacturing process, reduces costs, and can effectively reduce winding harmonics and reduce noise.

[0446] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A flat wire motor stator, characterized in that: The stator core comprises a stator iron core and a stator flat wire winding. The stator iron core is annular and has a plurality of winding slots formed on its inner wall along its circumference. The total number Q of the winding slots is a natural number and a multiple of 3. The number of winding slot layers is 2N, where N is greater than or equal to 2. The stator flat wire winding is embedded in the plurality of winding slots and comprises a three-phase flat wire winding. The number of poles P of the stator flat wire winding is an even multiple of 3. The number of slots per pole per phase q is 3. Each phase flat wire winding has L parallel branches, where L is greater than or equal to 2. Each branch is connected and wound by a plurality of U-shaped conductors inserted into the winding slots. The U-shaped conductors have an insert end and a welding end. The welding end of the U-shaped conductor is formed with two twisted legs outside the winding slot. The flat wire motor stator is wired out from the welding end. The output structure of each phase flat wire winding is as follows: the phase output end and the phase lead end of each branch are arranged on the same row of twisted legs in the radial direction of the stator core and correspond to any two adjacent nth and n+1th layers in the same winding slot, where n and n+1 are in the range of 1 to 2N. In the circumferential direction of the stator core, the phase output end of each branch corresponds to a plurality of winding slots arranged continuously in the nth layer, and the phase lead end of each branch corresponds to a plurality of winding slots arranged continuously in the n+1th layer. Each phase flat wire winding has two parallel-connected first and second branches with reversely symmetrical winding patterns, wherein the winding pattern includes a U-shaped conductor arrangement and connection rule with different pitches.

2. The flat wire motor stator according to claim 1, characterized in that: Continuously winding from the outside of the stator core to the inside along the circumference of the stator core, the first branch forms a first winding section, and the second branch forms a second winding section; The two branches are continuously wound from the inside to the outside of the stator core along the circumference of the stator core, the first branch forming a third winding section, and the second branch forming a fourth winding section; Viewed from the same winding direction, the winding method of the first winding segment is the same as the winding method of the fourth winding segment, and the winding method of the third winding segment is the same as the winding method of the second winding segment. The winding direction includes a first direction from the phase output terminal to the phase lead terminal and a second direction from the phase lead terminal to the phase output terminal.

3. The flat wire motor stator according to claim 1, characterized in that: The phase outgoing wire end and the phase lead wire end of each branch are arranged on the same row of twisted legs in the radial direction of the stator core and respectively correspond to the second outermost 2N-1 layer and the outermost 2N layer in the same winding slot.

4. The flat wire motor stator according to claim 2, characterized in that: The winding slot has N layer groups, each layer group has two adjacent odd-numbered layers and an even-numbered layer, The winding method of the second winding section includes: In each layer group, multiple U-shaped conductors with the same pitch are used for cross-layer wiring.

5. The flat wire motor stator according to claim 4, characterized in that: A U-shaped conductor with a pitch of 8 is used at the beginning or end of the second winding section for same-layer wiring.

6. The flat wire motor stator according to claim 4, characterized in that: N is a natural number greater than 2, and the stator flat wire winding has a full-pitch structure or a cross-short structure. U-shaped conductors with a pitch of a are used for inter-layer insertion in all the layer groups, and U-shaped conductors with a pitch of a are also used for inter-layer insertion between two adjacent layer groups to perform winding transition between the layer groups.

7. The flat wire motor stator according to claim 6, characterized in that: a is selected from 8, 9 or 10.

8. The flat wire motor stator according to claim 4, characterized in that: N is a natural number greater than 2, the stator flat wire winding has a first separated short-pitch structure, In the first separated short-pitch structure, N is an odd number greater than 2, and each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot modules in the radial direction of the stator core. Each of the rectangular winding slot modules occupies N layers of winding slots in the radial direction of the stator core and occupies three consecutively arranged winding slots in the circumferential direction of the stator core. The two rectangular winding slot modules are offset by one winding slot in the circumferential direction of the stator core. In each rectangular winding slot module: U-shaped conductors with a pitch of a are used in all layer groups for cross-layer insertion; The layer groups of the stator core radially spanning the two rectangular winding slot modules are inserted across the layers using U-shaped conductors with a pitch of a±1; Between every two adjacent layer groups, a U-shaped conductor with a pitch of a is used to insert wires across the layers to achieve winding transition between the layer groups.

9. The flat wire motor stator according to claim 8, characterized in that: a is 9.

10. The flat wire motor stator according to claim 4, characterized in that: N is a natural number greater than 2, the stator flat wire winding has a second separated short-pitch structure, in which N is an even number greater than 2, and each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot modules in the radial direction of the stator core. Each of the rectangular winding slot modules occupies N layers of winding slots in the radial direction of the stator core and occupies three consecutively arranged winding slots in the circumferential direction of the stator core. The two rectangular winding slot modules are offset by one winding slot in the circumferential direction of the stator core. In each rectangular winding slot module: U-shaped conductors with a pitch of a are used for inter-layer insertion in all layer groups, and U-shaped conductors with a pitch of a are also used between two adjacent layer groups to perform inter-layer winding transition; Between two layer groups belonging to different rectangular winding slot modules, a U-shaped conductor with a pitch of a' is used for cross-layer insertion to perform winding transition between the layer groups.

11. The flat wire motor stator according to claim 10, characterized in that: a is 9, and a' is selected from 8 or 10.

12. The flat wire motor stator according to claim 2, characterized in that: The winding slot has N layer groups, each layer group has two adjacent odd-numbered layers and an even-numbered layer, The winding method of the first winding section includes: In each layer group, two U-shaped conductors with a pitch difference of 4 are used to alternately cross the layers along the circumference of the stator core.

13. The flat wire motor stator according to claim 12, characterized in that: A U-shaped conductor with a pitch of 10 is used at the beginning or end of the first winding section for same-layer wiring.

14. The flat wire motor stator according to claim 12, characterized in that: N is a natural number greater than 2, and the stator flat wire winding has a full-pitch structure or a cross-short structure; In all the layer groups, U-shaped conductors with a pitch of b and U-shaped conductors with a pitch of c are alternately inserted across the layers along the circumference of the stator core. U-shaped conductors with a pitch of c are also inserted across the layers between two adjacent layer groups to perform winding transition between the layer groups, and cb is equal to 4.

15. The flat wire motor stator according to claim 14, characterized in that: b is 7, c is 11; Or, b is 8, c is 12; Or, b is 6 and c is 10.

16. The flat wire motor stator according to claim 12, characterized in that: N is a natural number greater than 2, the stator flat wire winding has a first separated short-pitch structure, in which N is an odd number greater than 2, and each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot modules in the radial direction of the stator core, each of the rectangular winding slot modules occupies N layers of winding slots in the radial direction of the stator core and occupies three consecutively arranged winding slots in the circumferential direction of the stator core, and the two rectangular winding slot modules are offset by one winding slot in the circumferential direction of the stator core; In each rectangular winding slot module: U-shaped conductors with a pitch of b and U-shaped conductors with a pitch of c are alternately inserted across layers in all layer groups along the circumference of the stator core. U-shaped conductors with a pitch of c are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups, and cb is equal to 4; The layer group spanning two rectangular winding slot modules adopts U-shaped conductors with a pitch of b' and U-shaped conductors with a pitch of c' to alternately cross the layers along the circumference of the stator core, and c'-b' is equal to 4.

17. The flat wire motor stator according to claim 16, characterized in that: c'=c+1, b'=b+1; Or, c'=c-1, b'=b-1; Or, b is 7 and c is 11.

18. The flat wire motor stator according to claim 12, characterized in that: N is a natural number greater than 2, the stator flat wire winding has a second separated short-pitch structure, in which N is an even number greater than 2, and each phase unit of the flat wire winding has two consecutively arranged rectangular winding slot modules in the radial direction of the stator core, each of the rectangular winding slot modules occupies N layers of winding slots in the radial direction of the stator core and occupies three consecutively arranged winding slots in the circumferential direction of the stator core, and the two rectangular winding slot modules are offset by one winding slot in the circumferential direction of the stator core; In each rectangular winding slot module: U-shaped conductors with a pitch of b and U-shaped conductors with a pitch of c are alternately inserted across layers in all layer groups along the circumference of the stator core. U-shaped conductors with a pitch of c are also inserted across layers between two adjacent layer groups to perform winding transition between the layer groups, and cb is equal to 4; Two layer groups belonging to different rectangular winding slot modules respectively use U-shaped conductors with a pitch of c" to perform cross-layer insertion to perform winding transition between the layer groups, where c"=c±1.

19. The flat wire motor stator according to claim 18, characterized in that: b is 7, c is 11, and c” is 10 or 12.

20. The flat wire motor stator according to claim 1, characterized in that: In the circumferential direction of the stator core, two intervals are formed between the outgoing wire structures of the three-phase flat wire winding, and the total number of winding slots corresponding to the two intervals is M≤(Q-6L) / 2, where M is a natural number.

21. The flat wire motor stator according to claim 20, characterized in that: The two intervals include a first interval and a second interval, the first interval is formed between the first-phase flat wire winding and the second-phase flat wire winding, the second interval is formed between the second-phase flat wire winding and the third-phase flat wire winding, the number of winding slots m1 corresponding to the first interval and the number of winding slots m2 corresponding to the second interval are equal, and the sum of m1 and m2 is M.

22. The flat wire motor stator according to claim 21, characterized in that: The total number M of winding slots corresponding to the two intervals satisfies Q / 4<M+3L<Q / 2.

23. The flat wire motor stator according to any one of claims 1 to 22, characterized in that: All outgoing wire ends of each phase of the flat wire winding are connected to the same outgoing wire copper bar, and the three-phase flat wire winding corresponds to three outgoing wire copper bars respectively; All phase lead ends of the three-phase flat wire winding are connected to the same star point copper bar; The three-phase flat wire winding is connected in star or delta.

24. A motor, characterized in that: A flat wire motor stator according to any one of claims 1 to 23.

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