Flat wire stator and motor

Abstract

The invention relates to a flat wire stator which comprises a stator core and a stator core, the stator core is provided with 4L stator slots, L is a positive integer, the slot number of each pole and each phase is 2K + 1, K is a positive integer, the 4L stator slots penetrate through the stator core in the axial direction of the stator core, and the 4L stator slots are distributed in an array mode in the circumferential direction of the stator core; the windings are connected with the stator core, the windings form 4N + 2 layers in the stator slots along the radial direction of the stator core, and N is a positive integer; the winding comprises three phases of sub-windings, the sub-winding of each phase comprises four branches which are connected in parallel, and the four branches are rotationally and symmetrically distributed along the axis of the stator iron core; each of the four branches comprises a plurality of first conductors which are connected in series, each first conductor comprises two plugging sections which are accommodated in the stator slot, and the two plugging sections of each first conductor are arranged on adjacent layers; the plurality of first conductors is disposed in A loops between adjacent layers. The motor comprises a flat wire stator. According to the scheme, circulation between parallel branches is avoided, and the efficiency of the motor is improved.

Description

Technical Field

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

[0002] With the development of electric vehicles, the power density of electric vehicle motors is getting higher and higher. Existing motors include round wire motors and flat wire motors. Compared with round wire motors, flat wire motors have a higher slot fill rate. The increase in slot fill rate means that more copper wires can be filled in under the premise of unchanged space, generating a stronger magnetic field and further improving power density. However, existing flat wire motors still have some shortcomings. For example, with the increase of parallel branches per phase, the risk of stator windings generating circulating currents increases, which in turn limits the electromagnetic design of multiple parallel branches, thereby limiting the improvement of motor power density. Summary of the invention

[0003] In order to solve the above problems in the prior art, the object of the present invention is to provide a flat wire stator and a motor, and the specific technical solutions adopted are as follows:

[0004] A flat wire stator comprises a stator core, wherein the stator core has 4L stator slots, L is a positive integer, the number of slots per pole per phase is 2K+1, K is a positive integer, the 4L stator slots penetrate the stator core along the axial direction of the stator core, the 4L stator slots are distributed in a circumferential array along the stator core, and the access end or lead-out end of any one of the four parallel branches is arranged on the first layer or the 4N+2 layer; and a winding, wherein the winding is connected to the stator core, and the winding is arranged inside the stator slot. The stator core is radially formed into 4N+2 layers, where N is a positive integer; the winding includes a three-phase sub-winding, and each phase of the sub-winding includes four parallel branches, and the four branches are rotationally symmetrically distributed along the axis of the stator core; each of the four branches includes a plurality of first conductors connected in series, and each of the plurality of first conductors includes two plug-in sections accommodated inside the stator slots, and the two plug-in sections are arranged in adjacent layers; and a plurality of the first conductors are provided with A turns between adjacent layers. The flat wire stator of the present invention has four parallel branches in each phase winding, and the parallel branches have a balanced circuit connection mode, which can effectively reduce the generation of AC loss in the stator winding, avoid circulating current between the parallel branches, improve the efficiency of the motor and reduce the temperature rise of the motor.

[0005] Optionally, the two plug-in sections are respectively arranged at the Mth layer and the M-1th layer, and the plurality of first conductors are arranged 1.5 turns between the Mth layer and the M-1th layer, wherein M≧2 and M is an even number, so that the winding forms a complete and continuous branch along the circumference of the stator core.

[0006] Optionally, the winding is sequentially provided with the first layer, the second layer, the third layer, the fourth layer, the fifth layer and the sixth layer inward from the end farthest from the axis of the stator core; the first conductors are provided with 1.5 turns between the sixth layer and the fifth layer, 1.5 turns between the fourth layer and the third layer, and 1.5 turns between the second layer and the first layer, so that the winding forms a complete and continuous branch along the circumference of the stator core.

[0007] Optionally, the access ends of the first branch and the third branch of the four branches are arranged on the first layer, and the lead-out ends are arranged on the sixth layer; the access ends of the second branch and the fourth branch (211d) of the four branches are arranged on the sixth layer, and the lead-out ends are arranged on the first layer. It is convenient to connect with the bus.

[0008] Optionally, the first conductor includes a first hairpin wire, the first hairpin wire includes a left twisting section and a right twisting section, the left twisting section and the right twisting section have the same bending direction, and extend out of one end of the stator core along the axial direction of the stator core to form a welding end 2b; the first conductor also includes a connecting section, the connecting section extends out of the other end of the stator core along the axial direction of the stator core to form a hairpin end 2a, and the connecting section is provided with a twisting portion. A plurality of first hairpin wires are connected in series to form one of the branches in the three-phase sub-winding, and the left twisting section and the right twisting section of each first hairpin wire have the same bending direction, so as to form a complete branch.

[0009] Optionally, the first conductor further includes a second hairpin, the second hairpin includes a connecting section, the connecting section is provided with a torsion portion, the second hairpin has the same structure as the first hairpin, the difference is that the torsion portion of the second hairpin and the torsion portion of the first conductor have opposite torsional directions; the pitch of the second hairpin is y1. The second hairpin can be used to achieve layer replacement of the first hairpin.

[0010] Optionally, the plurality of first hairpin lines include three types of first hairpin lines with pitch y1, pitch y2 and pitch y3, and the three types of first hairpin lines have the same shape, and the difference lies in different pitches. There are fewer types of first hairpin lines, which reduces the difficulty of processing and manufacturing.

[0011] Optionally, a second conductor is provided at the access end of each branch, a lower torsion section is provided at the lower end of the second conductor, and the lower torsion section is connected to the first first conductor; a third conductor is provided at the lead-out end of each branch, a lower torsion section is provided at the lower end of the third conductor, and the lower torsion section is connected to the last first conductor; the bending directions of the third conductor and the second conductor are opposite. The second conductor and the third conductor are respectively provided as the access end and the lead-out end, so that the winding forms a complete and continuous branch along the circumference of the stator core.

[0012] Optionally, the number of slots per pole and per phase is 3, and the stator core has 108 stator slots, which is convenient for heat dissipation of the motor and improves the performance of the motor.

[0013] A motor comprises a rotating shaft; a rotor, the rotor being sleeved on the rotating shaft; and any flat wire stator as described above, the flat wire stator and the rotor being coaxially arranged. The motor is used for driving a car. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Further features and advantages of the invention are apparent from the following description, which explains the invention in more detail based on an embodiment in conjunction with the drawings.

[0015] Figure 1 It is a schematic structural diagram of the flat wire stator of the present invention;

[0016] Figure 2 It is a structural schematic diagram of a single branch circuit and a stator core assembly of the present invention;

[0017] Figure 3 is an axial schematic diagram of the stator core of the present invention;

[0018] Figure 4 It is a schematic diagram of a fan-shaped structure of the stator core of the present invention;

[0019] Figure 5a It is a part of the expanded diagram of one phase sub-winding of the winding of the present invention;

[0020] Figure 5b The present invention Figure 5a The remaining part of the expansion diagram of one phase sub-winding;

[0021] Figure 6a is an expanded view of a first branch of one phase sub-winding of the present invention;

[0022] Figure 6b is an expanded view of the second branch of one phase sub-winding of the present invention;

[0023] Figure 6c is an expanded view of the third branch of one of the phase sub-windings of the present invention;

[0024] Figure 6d is an expanded view of the fourth branch of one of the phase sub-windings of the present invention;

[0025] Figure 7 are a front view and a top view of the connection between the first hairpin wire and the second conductor of the present invention;

[0026] Figure 8 are a front view and a top view of the connection between the first hairpin wire and the third conductor of the present invention;

[0027] Fig. 9 It is a front view and a top view of the connection between the first hairpin line and the second hairpin line of the present invention.

[0028] Fig.10 It is a partial structural schematic diagram of the motor of the present invention.

[0029] Among them, the main marks of the drawings in the figure are as follows:

[0030] 1-stator core, 11-stator slot, 2-winding, 2a-hairpin end, 2b-welding end, 21-sub-winding, 211-branch, 211a-first branch, 211b-second branch, 211c-third branch, 211d-fourth branch, 3-first conductor, 31-first hairpin line, 32-second hairpin line, 311a, 321a-left plug-in section, 311b, 321b-right plug-in section, 312, 322-connecting section, 312a, 322a-torsion section, 313a, 323a-left torsion section, 313b, 323b-right torsion section, 4-second conductor, 5-third conductor, 41, 51-plug-in section, 42, 52-upper torsion section, 43, 53-lower torsion section, 200-rotor, 300-rotating shaft DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left", "right", "front", "back" and similar expressions used herein are only for the purpose of illustration and are not intended to limit the present invention.

[0032] A flat wire stator comprises a stator core 1, wherein the stator core 1 is provided with 4L stator slots 11, L is a positive integer, the number of slots per pole per phase is 2K+1, K is a positive integer, the 4L stator slots 11 penetrate the stator core 1 along the axial direction of the stator core 1, the 4L stator slots 11 are arranged in an array along the circumference of the stator core 1, and the access end or the lead-out end of any one of the four parallel branches 211 is arranged on the first layer or the 4N+2 layer; and a winding 2, the winding 2 is connected to the stator core 1, and the winding 2 is arranged inside the stator slot 11 along the stator core 1 forms 4N+2 layers in the radial direction, where N is a positive integer; the winding 2 includes a three-phase sub-winding 21, and the sub-winding 21 of each phase includes four parallel branches 211, and the four branches 211 are rotationally symmetrically distributed along the axis of the stator core 1; each of the four branches 211 includes a plurality of first conductors 3 connected in series, and the first conductor 3 includes two plug-in sections 311 accommodated in the inside of the stator slot 11, and the two plug-in sections 311 of each first conductor 3 are arranged in adjacent layers; and a plurality of first conductors 3 are provided with A turns between adjacent layers.

[0033] In some embodiments, the two plug-in sections 311 of the multiple first conductors 3 of each branch 21 are respectively arranged on the Mth layer and the M-1th layer, and the multiple first conductors 3 are arranged 1.5 turns between the Mth layer and the M-1th layer; wherein M≧2, and M is an even number.

[0034] In some embodiments, the winding 2 is sequentially arranged inwardly along the end farthest from the axis of the stator core 1, namely, the 1st layer, the 2nd layer, the 3rd layer, the 4th layer, the 5th layer and the 6th layer; the plurality of first conductors 3 are arranged 1.5 turns between the 6th layer and the 5th layer, 1.5 turns between the 4th layer and the 3rd layer, and 1.5 turns between the 2nd layer and the 1st layer.

[0035] like Figure 3 As shown, the stator core 1 of this example is a hollow cylindrical structure. The stator core 1 is provided with a plurality of stator slots 11 penetrating the stator core 1 along the axial direction. The plurality of stator slots 11 are distributed in an array along the circumference of the stator core 1. The plurality of stator slots 11 extend radially from the inner surface of the stator core 1. Figure 1 As shown, the winding 2 is formed by winding a plurality of first conductors 3 in a plurality of stator slots 11. In this example, a flat hairpin wire is used to improve the slot fill rate of the winding 2, thereby improving the efficiency of the motor. The winding 2 extends a portion at both ends of the axial direction of the stator core 1. The winding 2 has a hairpin end 2a and a welding end 2b, and the hairpin end 2a and the welding end 2b are located on both sides of the axial direction of the stator core 1.

[0036] The winding 3 in this example includes a three-phase sub-winding 21, each phase of the sub-winding 21 includes four parallel branches 211, each branch 211 includes a plurality of first conductors 3 connected in series, the first conductor 3 includes two plug-in sections 311 accommodated in the stator slots, and the two plug-in sections 311 of the first conductor 3 in this example are arranged in adjacent layers. For ease of understanding, the specific starting position of the stator slot 11 is defined, and the number represents the number of the stator slot 11 where the first conductor 3 is located; Figure 4 As shown, in this example, the plurality of first conductors 3 may be arranged in 6 layers along the radial direction of the stator core 1. For ease of understanding, the first layer, the second layer, the third layer, the fourth layer, the fifth layer and the sixth layer are defined in sequence from the end farthest from the stator core 1. In this example, the plurality of first conductors 3 of each branch 211 are arranged 1.5 turns between the sixth layer and the fifth layer, 1.5 turns between the fourth layer and the third layer, and 1.5 turns between the second layer and the first layer.

[0037] In some embodiments, the access ends of the first branch 211a and the third branch 211c of the four branches 211 are set at the 1st layer, and the lead-out ends are set at the 6th layer; the access ends of the second branch 211b and the fourth branch 211d of the four branches 211 are set at the 6th layer, and the lead-out ends are set at the 1st layer.

[0038] The three-phase winding in this example includes a U-phase sub-winding, a V-phase sub-winding and a W-phase sub-winding. The three-phase sub-windings are symmetrically distributed along the axial direction of the stator core 1. Each phase of the sub-winding includes four branches 211, and the four branches 211 are symmetrically distributed along the axial direction of the stator core 1. This example takes the U phase as an example. Figure 6a As shown, it is a schematic diagram of the expansion of the first branch 211a of the U-phase winding, U1 is the access end, and X1 is the lead-out end; Figure 6b As shown in FIG. 1 , it is a schematic diagram of the expansion of the second branch 211b of the U-phase winding, where U2 is the access end and X2 is the lead-out end; Figure 6c As shown, it is a schematic diagram of the expansion of the third branch 211c of the U-phase winding, U3 is the access end, and X3 is the lead-out end; Figure 6d As shown, it is a schematic diagram of the expansion of the fourth branch 211c of the U-phase winding, U4 is the access end, and X4 is the lead-out end; wherein, 35 stator slots 11 are spaced between U2 and U1, 35 stator slots 11 are spaced between U3 and U4, and 44 stator slots 11 are spaced between U2 and U3. The access ends of the first branch 211a and the third branch 211c are arranged on the first layer, and the lead-out ends are arranged on the sixth layer; the access ends of the second branch 211b and the fourth branch 211d are arranged on the sixth layer, and the lead-out ends are arranged on the first layer. The access ends and lead-out ends of all branches 211 of the three-phase sub-winding are arranged on the hairpin end 2a, which is convenient for connection with the busbar.

[0039] In some embodiments, the first conductor 3 includes a first hairpin line 31, the first hairpin line 31 includes a left torsion segment 313a and a right torsion segment 313b, the left torsion segment 313a and the right torsion segment 313b have the same bending direction and extend out of the stator core 1 along the axial direction of the stator core 1 at one end to form a welding end 2b; the first conductor 3 also includes a connecting segment 312, the connecting segment 312 extends out of the stator core 1 along the axial direction of the stator core 1 at the other end to form a hairpin end 2a, and the connecting segment is provided with a torsion portion 312a.

[0040] like Figure 7As shown, the first hairpin line 31 includes a left plug-in section 311a and a right plug-in section 311b accommodated in the stator slot 11, and the first hairpin line 31 also includes a V-shaped connecting section 312, the lower left end of the connecting section 312 is connected to the left plug-in section 311a, and the lower right end of the connecting section 213 is connected to the right plug-in section 311b. The connecting section 312 is provided with a torsion portion 312a, and one end of the connecting section 312 axially extends out of the stator core 1 to form a hairpin end 2a; the lower end of the left plug-in section 311a is provided with a left torsion section 313a in a direction away from the right plug-in section 311b, The right twisting section 313b is arranged at the lower end of the right plug-in section 311b in a direction away from the left plug-in section 311a. The left twisting section 313a and the right twisting section 313b extend out of the other end of the stator core 1 in the axial direction of the stator core 1 to form a welding end 2b. The left twisting section 313a and the right twisting section 313b have a portion of conductors extending vertically downward, which is convenient for welding adjacent first hairpins 31. Multiple first hairpins 31 are connected in series, specifically, the right twisting section 313b of the first hairpin 31 is connected to the left twisting section 313a of the adjacent first hairpin 31. The left plug-in section 311a and the right plug-in section 311b are arranged in adjacent layers.

[0041] In some embodiments, the first conductor 3 also includes a second hairpin 32, the second hairpin 32 includes a connecting segment 322, the connecting segment 322 is provided with a torsion portion 322a, the second hairpin 32 and the first hairpin 31 have the same shape, the difference is that the torsion portion 322a of the second hairpin 32 and the torsion portion 312a of the first hairpin 31 have opposite torsional directions; the pitch of the second hairpin 32 is y1.

[0042] like Fig. 9As shown, the second hairpin line 32 includes a left slot segment 321a and a right slot segment 321b parallel to the left slot segment 321a, and the left slot segment 321a and the right slot segment 321b are accommodated in adjacent layers of the stator core 1; the upper ends of the left slot segment 321a and the right slot segment 321b are connected by a connecting segment 322, and the connecting segment 322 is provided with a torsion portion 322a, the lower left end of the connecting segment 322 is connected to the left slot segment 321a, and the lower right end of the connecting segment 322 is connected to the right slot segment 321b, and the connecting segment 322 forms a hairpin end at one end of the stator core 1 along the axial direction of the stator core 1; the left slot segment 321a The lower end of the stator core 1 is provided with a left twisting section 323a in a direction away from the right slot section 321b, and the lower end of the right slot section 321b is provided with a right twisting section 323b in a direction away from the left slot section 321a. The left twisting section 323a and the right twisting section 321b extend out of the other end of the stator core 1 along the axial direction of the stator core 1 to form a welding end 2b. The left twisting section 323a and the right twisting section 323b have a portion of conductor extending vertically downward, which is convenient for welding the second hairpin wire 32 with the adjacent first hairpin wire 31. In this example, each branch 211 includes two second hairpin wires 32, and the pitch of the second hairpin wire 32 is 9. The second hairpin wire 32 and the first hairpin wire 31 have the same appearance, and the difference is that the bending direction of the twisting portion 322a of the second hairpin wire 32 and the twisting portion 312a of the first hairpin wire 31 are opposite, which is convenient for realizing the layer change of each branch 211.

[0043] The second hairpin line 32 can be used to change the layer of the first hairpin line 31, such as Figure 6a As shown, it is a schematic diagram of the expansion of the first branch 211a of the U-phase sub-winding 21, multiple first hairpin wires 31 are set 1.5 turns between the 1st layer and the 2nd layer, multiple first hairpin wires 31 are set 1.5 turns between the 3rd layer and the 4th layer, and a second hairpin wire 32 is used to connect the first branch 211a between the 2nd layer and the 3rd layer; similarly, multiple first hairpin wires 31 are set 1.5 turns between the 5th layer and the 6th layer, and a second hairpin wire 32 is used to connect the first branch 211a between the 4th layer and the 5th layer, and the pitch of the second hairpin wire 32 is 9, so as to ensure that each branch 211 is connected neatly and compactly.

[0044] In some embodiments, the plurality of first hairpin lines 31 include three types of first hairpin lines 31 with a pitch y1, a pitch y2, and a pitch y3. The three types of first hairpin lines 31 have the same shape, but differ in that the pitches are different.

[0045] This example includes three types of first hairpin wires 31, and the three types of first hairpin wires 31 have the same appearance, but differ in pitch. The pitch refers to the number of stator slots 11 occupied by the left plug-in section 311a and the right plug-in section 311b. In this example, the pitch y1=9, the pitch y2=7, and the pitch y3=10; each branch 21 includes multiple first hairpin wires 31 with different pitches, so that the multiple first hairpin wires 31 can form a complete branch 211 neatly and compactly along the circumference of the stator core 1.

[0046] In some embodiments, a second conductor 4 is provided at the access end of each branch 21, a lower torsion section 43 is provided at the lower end of the second conductor 4, and the lower torsion section 43 is connected to the left torsion section 313a of the first hairpin line 31 of each branch 21; a third conductor 5 is provided at the lead-out end of each branch 21, a lower torsion section 53 is provided at the lower end of the third conductor 5, and the lower torsion section 53 is connected to the right torsion section 313b of the last first hairpin line 31 of each branch 21; the bending directions of the third conductor 5 and the second conductor 4 are opposite.

[0047] like Figure 7 As shown, it is a schematic diagram of the connection between the second conductor 4 and the first hairpin wire 31. The second conductor 4 includes a plug-in section 41 arranged inside the stator slot 11. The upper end of the plug-in section 41 is twisted to the left to form an upper twisting section 42, which is arranged at the hairpin end; the lower end of the plug-in section 41 is twisted to the right to form a lower twisting section 43, which is arranged at the welding end 2b, and the lower twisting section 43 is connected to the left twisting section 313a of the first first hairpin wire 31 of each branch 21; the second conductor 4 is arranged at the first layer as the access end. Figure 8 , which is a schematic diagram of the connection between the third conductor 5 and the first hairpin wire 31. The third conductor 5 includes a plug-in section 51 arranged inside the stator slot 11. The upper end of the plug-in section 51 is twisted to the right to form an upper twisting section 52, which is arranged at the hairpin end; the lower end of the plug-in section 51 is twisted to the left to form a lower twisting section 53, which is arranged at the welding end 2b, and the lower twisting section 53 is connected to the right twisting section 313a of the last first hairpin wire 31 of each branch 21; the third conductor 5 is arranged on the sixth layer as a lead-out end. The bending directions of the third conductor 5 and the second conductor 4 are opposite, ensuring that each branch 211 forms a complete loop.

[0048] In some embodiments, the number of slots per pole per phase is 3, and the stator core 1 has 108 stator slots 11 .

[0049] like Figure 3 and Figure 6aAs shown, the number of stator slots 11 in this example is 108. For ease of understanding, the specific starting position of the stator slot 11 is defined, the number represents the number of the stator slot 11 where the hairpin line is located, and the combination of the letter L and the number represents the layer where the hairpin line is located. For example, 2L1 means that a plug-in section of the hairpin line is located in the first layer of the second stator slot 11. It should be noted that the starting position of each branch 211 can select any stator slot 11. This example only provides an explanation of one embodiment.

[0050] The stator core 1 of this example has 108 stator slots 11, and the number of slots per pole per phase is 3. The number of slots per pole per phase refers to the number of slots that each phase should occupy under each magnetic pole. The conductors 3 of every two adjacent layers are staggered by one stator slot 11 along the axial direction of the stator core 1. Specifically, as shown in FIG5 , it is a winding expansion diagram of the U-phase sub-winding 21. Taking the winding 2 with one pole as an example, the first conductor 3 is arranged in the stator slots 11 No. 1, No. 2 and No. 3 between the first layer and the second layer, the first conductor 3 is arranged in the stator slots 11 No. 2, No. 3 and No. 4 between the third layer and the fourth layer, and the first conductor 3 is arranged in the slots 3, No. 4 and No. 5 between the fifth layer and the sixth layer. This circumferential staggering can reduce the harmonics of the winding.

[0051] like Figure 6aAs shown, the second conductor 4 is arranged as an access end at the outermost first layer of the stator core 1, the left plug-in sections 311a of the plurality of first hairpin wires 31 are arranged at the second layer, the left torsion section 313a of the first hairpin wire 31 is welded to the lower torsion section 43 of the second conductor 4, and the right plug-in sections 311b of the plurality of first hairpin wires 31 are arranged at the first layer. With reference to this arrangement, the left plug-in section 311a of each first hairpin wire 31 is arranged at the second layer, the right plug-in section 311b of each first hairpin wire 31 is arranged at the first layer, the right torsion section 311b of the previous first hairpin wire 31 is connected to the left torsion section 313a of the next adjacent first hairpin wire 31, and when the first hairpin wire 31 is arranged 1.5 turns between the first layer and the second layer, the second hairpin wire 32 is used to wrap to The next layer, specifically, in this example, when the right plug-in section 311b of the first hairpin line 31 is set at 38L1, a second hairpin line 32 is set, the left plug-in section 321a of the second hairpin line 32 is set at 47L2, the right plug-in section 321b of the second hairpin line 32 is set at 56L3, the left torsion section 323a of the second hairpin line 32 is connected to the right torsion section 313b of the previous first hairpin line 31, the right torsion section 323b of the second hairpin line 32 is connected to the left torsion section 313a of the next first hairpin line 31, the left plug-in section 311a of the next first hairpin line 31 connected to the second hairpin line 32 is set at 65L4, and the right plug-in section is set at 74L3, so the first hairpin line 31 is transferred from the 1st and 2nd layers to the 3rd and 4th layers. Similarly, when the first hairpin line 31 is connected to the 3rd and 4th layers for 1.5 turns, it is transferred to the 5th and 6th layers in the same way. When the first hairpin line 31 is connected to the 5th and 6th layers for 1.5 turns, the third conductor 5 of the lead-out end is connected to form a complete branch 21.

[0052] like Figure 5a and Figure 5b As shown, it is an expanded view of the U-phase sub-winding in the three-phase sub-winding 21. The three-phase sub-winding 21 is wound in the same manner, wherein the access ends of the first branch 211a of each phase sub-winding 21 are spaced apart by 6 stator slots 11. This embodiment is described by taking the U-phase as an example, the U-phase sub-winding 21 includes four branches 211, and the four branches 211 are rotationally symmetrically distributed along the axis of the stator core 1, and each branch 21 includes 18 first hairpins 31 with y1=9, 2 first hairpins 31 with y2=7, 4 first hairpins 31 with y3=10, and 2 second hairpins 32 with a pitch of 9.

[0053] The following takes the U-phase winding as an example to illustrate the winding method of the four branches 21 of the U-phase, wherein the brackets {} represent the first hairpin wire 31 with a pitch of 7, the brackets [] represent the first hairpin wire 31 with a pitch of 10, the brackets () represent the second hairpin wire 32, and the rest represent the first hairpin wire 31 with a pitch of 9.

[0054] like Figure 6a As shown, the winding method of the first branch 211a of the U-phase winding is as follows:

[0055] 3L1→12L2-21L1→30L2-39L1→{48L2-55L1}→64L2-73L1→82L2-91L1→[100L2-2L1]→11L2-20L1→29L2-38L1→(47 L2-56L3)→65L4-74L3→83L4-92L3→[101L4-3L3]→12L4-21L3→30L4-39L3→[48L4-58L3]→67L4-76L3→85L4-94L3 →(103L4-4L5)→13L6-22L5→31L6-40L5→[49L6-59L5]→68L6-77L5→86L6-95L5→{104L6-3L5}→12L6-21L5→30L6-39L5→48L6; wherein 3L1 is the access end U1 of the first branch 211a, and 48L6 is the lead-out end X1 of the first branch 211a; the first branch of the V-phase sub-winding and the W-phase sub-winding can be obtained by translating the first branch 211a of the U-phase sub-winding.

[0056] like Figure 6b As shown, the winding method of the second branch 211b of the U-phase winding is as follows:

[0057] 39L6→30L5-21L6→12L5-3L6→{102L5-95L6}→86L5-77L6→68L5-59L6→[50L5-40L6]→31L5-22L6→13L 5-4L6→(103L5-94L4)→85L3-76L4→67L3-58L4→[49L3-39L4]→30L3-21L4→12L3-3L4→[102L3-92L4]→ 83L3-74L4→65L3-56L4→(47L3-38L2)→29L1-20L2→11L1-2L2→[101L1-91L2]→82L1-73L2→64L1-55L2→{46L1-39L2}→30L1-21L2→12L1-3L2→102L1; wherein 39L6 is the access terminal U2 of the second branch 211b, and 102L1 is the lead-out terminal X2 of the second branch 211b. The second branches of the V-phase sub-winding and the W-phase sub-winding can be obtained by translating the second branch 211b of the U-phase sub-winding.

[0058] like Figure 6c As shown, the winding method of the third branch 211c of the U-phase winding is as follows:

[0059] 57L1→66L2-75L1→84L2-93L1→{102L2-1L1}→10L2-19L1→28L2-37L1→[46L2-56L1]→65L2-74L1→83L 2-92L1→(101L2-2L3)→11L4-20L3→29L4-38L3→[47L4-57L3]→66L4-75L3→84L4-93L3→[102L4-4L3]→ 13L4-22L3→31L4-40L3→(49L4-58L5)→67L6-76L5→85L6-94L5→[103L6-5L5]→14L6-23L5→32L6-41L5→{50L6-57L5}→66L6-75L5→84L6-93L5→102L6; wherein 57L1 is the access terminal U3 of the third branch 211c, and 39L6 is the lead-out terminal X3 of the third branch 211c. The third branches of the V-phase sub-winding and the W-phase sub-winding can be obtained by translating the third branch 211c of the U-phase sub-winding.

[0060] like Figure 6d As shown, the winding method of the fourth branch 211d of the U-phase winding is as follows:

[0061] 93L6→84L5-75L6→66L5-57L6→{48L5-41L6}→32L5-23L6→14L5-5L6→[104L5-94L6]→85L5-76L6→67L 5-58L6→(49L5-40L4)→31L3-22L4→13L3-4L4→[103L3-93L4]→84L3-75L4→66L3-57L4→[48L3-38L4] →29L3-20L4→11L3-2L4→(101L3-92L2)→83L1-74L2→65L1-56L2→[47L1-37L2]→28L1-19L2→10L1-1L2→{100L1-93L2}→84L1-75L2→66L1-57L2→48L1; wherein 93L6 is the access terminal U4 of the fourth branch 211d, and 48L1 is the lead-out terminal X4 of the fourth branch 211d. The fourth branches of the V-phase sub-winding and the W-phase sub-winding can be obtained by translating the fourth branch 211d of the U-phase sub-winding.

[0062] The present application also provides a motor, such as Fig.10 As shown, the motor comprises a rotating shaft 300, a rotor 200, which is sleeved on the rotating shaft 300 and fixedly connected to the rotating shaft 300, and any flat wire stator as described above, which is coaxially arranged with the rotor 200. The motor can be used for driving a vehicle.

[0063] The flat wire stator and motor of the present application use fewer types of hairpin wires, reducing the difficulty of manufacturing and processing; the four parallel branches of each phase have a balanced circuit connection method, which can effectively reduce the generation of AC losses in the stator winding and avoid circulating currents between parallel branches, thereby improving the efficiency of the motor and reducing the temperature rise of the motor.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present application.

Claims

1. A flat wire stator, characterized in that: include: A stator core (1), the stator core (1) being provided with 4L stator slots (11), L being a positive integer, the number of slots per pole per phase being 2K+1, K being a positive integer, the 4L stator slots (11) penetrating the stator core (1) along the axial direction of the stator core (1), and the 4L stator slots (11) being distributed in a circumferential array along the stator core (1); and A winding (2), the winding (2) being connected to the stator core (1), the winding (2) forming 4N+2 layers in the radial direction of the stator core (1) inside the stator slot (11), N being a positive integer; the winding (2) comprising a three-phase sub-winding (21), the sub-winding (21) of each phase comprising four parallel branches (211), the four branches (211) being rotationally symmetrically distributed along the axis of the stator core (1), the four parallel branches The access end or the lead-out end of any one of the four branches (211) is arranged on the first layer or the 4N+2 layer; each of the four branches (211) comprises a plurality of first conductors (3) connected in series, each of the plurality of first conductors (3) comprises two plug-in sections (311) accommodated inside the stator slots (11), and the two plug-in sections (311) are arranged on adjacent layers; and the plurality of first conductors (3) are provided with an A loop between adjacent layers.

2. The flat wire stator according to claim 1, characterized in that: The two plug-in sections (311) are respectively arranged on the Mth layer and the M-1th layer, and the plurality of first conductors (3) are arranged 1.5 turns between the Mth layer and the M-1th layer; Where M≧2, and M is an even number.

3. The flat wire stator according to claim 2, characterized in that: The winding (2) is sequentially provided with a first layer, a second layer, a third layer, a fourth layer, a fifth layer and a sixth layer inwardly along the end farthest from the axis of the stator core (1); the plurality of first conductors are provided with 1.5 turns between the sixth layer and the fifth layer, 1.5 turns between the fourth layer and the third layer, and 1.5 turns between the second layer and the first layer.

4. The flat wire stator according to claim 3, characterized in that: The access ends of the first branch (211a) and the third branch (211c) of the four branches (211) are arranged on the first layer, and the lead-out ends are arranged on the sixth layer; the access ends of the second branch (211b) and the fourth branch (211d) of the four branches (211) are arranged on the sixth layer, and the lead-out ends are arranged on the first layer.

5. The flat wire stator according to claim 1, characterized in that: The first conductor (3) comprises a first hairpin (31), the first hairpin (31) comprising a left twisting section (313a) and a right twisting section (313b), the left twisting section (313a) and the right twisting section (313b) having the same bending direction, extending out of one end of the stator core (1) along the axial direction of the stator core (1) to form a welding end (2b); the first conductor (3) further comprises a connecting section (312), the connecting section (312) extending out of the other end of the stator core (1) along the axial direction of the stator core (1) to form a hairpin end (2a), and the connecting section is provided with a twisting portion (312a).

6. The flat wire stator according to claim 5, characterized in that: The first conductor (3) further comprises a second hairpin (32), the second hairpin (32) comprising a connecting section (322), the connecting section (322) being provided with a twisting portion (322a), the second hairpin (32) and the first hairpin (31) having the same structure, except that the twisting directions of the twisting portion (322a) of the second hairpin (32) and the twisting portion (312a) of the first conductor (31) are opposite; the pitch of the second hairpin (32) is y1.

7. The flat wire stator according to claim 6, characterized in that: The plurality of first hairpin lines (31) include three types of first hairpin lines (31) with a pitch y1, a pitch y2 and a pitch y3. The three types of first hairpin lines (31) have the same shape, but differ in that the pitches are different.

8. The flat wire stator according to claim 6, characterized in that: A second conductor (4) is arranged at the input end of each branch (21), a lower torsion section (41) is arranged at the lower end of the second conductor (4), and the lower torsion section (41) is connected to the first of the first conductors (3); a third conductor (5) is arranged at the output end of each branch (21), a lower torsion section (51) is arranged at the lower end of the third conductor (5), and the lower torsion section (51) is connected to the last of the first conductors (3); the bending directions of the third conductor (5) and the second conductor (4) are opposite.

9. The flat wire stator according to claim 1, characterized in that: The number of slots per pole and per phase is 3, and the stator core (1) is provided with 108 stator slots (11).

10. A motor, characterized in that: The motor comprises: Rotating shaft (300); a rotor (200), wherein the rotor (200) is sleeved on the rotating shaft (300); and The flat wire stator as claimed in any one of claims 1 to 9, wherein the flat wire stator and the rotor (200) are coaxially arranged.

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