Asymmetric same-slot out-of-phase flat wire stator and motor

Abstract

The invention relates to an asymmetric same-groove out-of-phase flat wire stator which comprises a stator iron core, a plurality of stator grooves are formed in the stator iron core, and the stator grooves are distributed in the circumferential direction of the stator iron core in an array mode. The windings are connected with the stator iron core, the windings form N layers in the stator slots along the radial direction of the stator iron core, and N is an even number; the winding comprises M phases of sub-windings, and M is a positive integer; the sub-winding of each phase comprises at least two branches which are connected in parallel; each branch comprises a plurality of conductors connected in series, and each conductor in the plurality of conductors spans two adjacent layers; a plurality of conductors of each pole and each phase are arranged in q adjacent stator slots, and q is greater than or equal to 2 and is a positive integer; the plurality of conductors located on the radial outer side of the stator core and the plurality of conductors located on the radial inner side of the stator core are staggered by one stator groove in the circumferential direction of the stator core. The motor comprises a flat wire stator. According to the flat wire stator, the torque fluctuation can be reduced while the torque of the motor is ensured, and the stable and efficient operation of the motor is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to an asymmetric same-slot different-phase flat wire stator and a motor. Background Art

[0002] Flat wire motor means that the shape of the wire used for the stator winding has changed from multiple thin round wires to several thick rectangular wires, i.e. flat wires; the arrangement of the stator winding in the stator slot will affect the back electromotive force amplitude and sinusoidality, and thus affect the motor performance; when the number of slots per pole per phase of the motor stator is q≥2, the stator winding has a distribution coefficient. The motor torque is the force of the motor rotation. Torque fluctuations not only cause the motor body to vibrate, but also cause the parts that the motor directly or indirectly contacts to vibrate, which may cause hazards such as high noise, resonance, and electromagnetic interference; the current technology stator winding is divided into two types: same-slot same-phase and symmetrical same-slot different-phase; the same-slot same-phase winding has large torque, but at the same time, the torque fluctuation is large; the symmetrical same-slot different-phase winding has small torque fluctuation, but at the same time, the torque is small. Summary of the invention

[0003] In order to solve the above problems in the prior art, the purpose of the present invention is to provide an asymmetric same-slot different-phase flat wire stator and motor, and the specific technical solutions adopted are as follows:

[0004] An asymmetric same-slot different-phase flat wire stator, comprising a stator core, the stator core having a plurality of stator slots, the plurality of stator slots penetrating the stator core in the axial direction of the stator core, and the plurality of stator slots distributed in a circumferential array along the stator core; and a winding, the winding being connected to the stator core, the winding forming N layers in the radial direction of the stator core inside the stator slot, N being an even number; the winding comprising M-phase sub-windings, M being a positive integer; the sub-winding of each phase comprising at least two parallel branches , the at least two parallel branches are rotationally symmetrically distributed around the axis of the stator core; each of the at least two parallel branches includes a plurality of conductors connected in series, and each of the plurality of conductors spans two adjacent layers; the plurality of conductors of each pole and each phase are arranged in q adjacent stator slots, q≧2 and q is a positive integer; the plurality of conductors located radially outside the stator core and the plurality of conductors located radially inside the stator core are staggered by one stator slot along the circumferential direction of the stator core. The flat wire stator of the present application can reduce torque fluctuations while ensuring the motor torque, thereby ensuring the smooth and efficient operation of the motor.

[0005] Optionally, the plurality of conductors span across the Nth layer and the N-1th layer, and the plurality of conductors are arranged in A loops between adjacent layers.

[0006] Optionally, the winding is provided with six layers in the radial direction of the stator core inside the stator slot, and the first layer, the second layer, the third layer, the fourth layer, the fifth layer and the sixth layer are arranged in sequence from the end of the axis farthest from the stator core; the plurality of conductors are provided with three turns between the sixth layer and the fifth layer, the plurality of conductors are provided with three turns between the fourth layer and the third layer, and the plurality of conductors are provided with three turns between the second layer and the first layer. The winding method of the branch is simple, which simplifies the difficulty of winding assembly.

[0007] Optionally, the plurality of conductors located in the first and second layers of each pole and each phase are staggered by one stator slot along the circumferential direction of the stator core from the plurality of conductors located in the third, fourth, fifth and sixth layers. Connecting in this way can form an asymmetric structure for the sub-winding of each phase, thereby reducing torque fluctuation while meeting the torque requirement.

[0008] Optionally, the winding includes a three-phase sub-winding, each phase sub-winding of the three-phase sub-winding includes a first branch and a second branch connected in parallel; the first branch, the first branch and the second branch have lead-in ends arranged on the sixth layer, and the first branch and the second branch have lead-out ends arranged on the first layer; the three-phase sub-winding is rotationally symmetrically distributed along the circumference of the stator core. The lead-in end and the lead-out end of each branch are kept at a short distance to facilitate connection with the busbar.

[0009] Optionally, the conductor includes a hairpin wire, the hairpin wire is provided with a left twisting section and a right plug-in section, the left twisting section and the right twisting section have the same bending direction; the left twisting section and the right twisting section extend out of one end of the stator core along the axial direction of the stator core to form a welding end. The left twisting section and the right twisting section have the same bending direction, so that the windings of each branch can be connected in sequence in the same direction, simplifying the difficulty of winding assembly.

[0010] Optionally, the lead-in end and the lead-out end of each branch are arranged on one side of the welding end. The lead-in end and the lead-out end of the three-phase winding are centrally arranged on one side of the welding end to facilitate connection with the busbar.

[0011] Optionally, each branch includes three types of hairpins with pitch y1, pitch y2 and pitch y3, and the three types of hairpins have the same shape, and the difference is that the pitches are different; each adjacent layer includes hairpins with three different pitches. The types of hairpins in each branch are small, which reduces the difficulty of processing and assembling the hairpins; and the hairpins between adjacent layers are the same, so that multiple hairpins can be assembled neatly and densely.

[0012] Optionally, the number of poles of the flat wire stator is 6, and the stator core includes 54 stator slots.

[0013] A motor comprises a rotating shaft; a rotor, the rotor being sleeved on the rotating shaft; and any one of the flat wire stators described above, the flat wire stator being coaxially arranged with the rotor. The motor is used to drive a vehicle. 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 is an axial schematic diagram of the stator core of the present invention;

[0017] Figure 3 It is a partial schematic diagram of the stator core of the present invention when it is fully filled with conductors;

[0018] Figure 4 It is a structural schematic diagram of the hairpin line of the present invention;

[0019] Figure 5a is an expanded view of a first branch of one phase winding of the present invention;

[0020] Figure 5b is an expanded view of the second branch of one phase winding of the present invention;

[0021] Figure 6 is a partial structural schematic diagram of a motor according to an embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of the winding distribution of a conventional same-slot same-phase motor with one pole number;

[0023] Figure 8 yes Figure 7 Schematic diagram of peak torque and torque ripple of a conventional same-slot and same-phase stator;

[0024] Fig. 9 It is a schematic diagram of the winding distribution of a conventional symmetrical same-slot, different-phase motor with one pole number;

[0025] Fig.10 yes Fig. 9 Schematic diagram of peak torque and torque ripple of a conventional symmetrical same-slot, different-phase stator;

[0026] Fig.11 Schematic diagram of winding distribution of an asymmetric same-slot different-phase motor with one pole number of the present invention;

[0027] Fig.12 It is a schematic diagram of peak torque and torque fluctuation of the asymmetric same-slot different-phase stator of the present invention.

[0028] Among them, the main marks of the drawings in the figure are as follows:

[0029] 1- stator core 11- stator slot 2- winding 2a- welding end 2b- hairpin end 21- sub-winding 211- branch 211a- first branch 211b- second branch 3- conductor 31- hairpin line 311a- left plug section 311b- right plug section 313- connection section 312a- left torsion section 312b- right torsion section 4- shaft 5- rotor DETAILED DESCRIPTION

[0030] 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.

[0031] An asymmetric same-slot different-phase flat wire stator comprises a stator core 1, the stator core 1 is provided with a plurality of stator slots 11, the plurality of stator slots 11 penetrate the stator core 1 along the axial direction of the stator core 1, and the plurality of stator slots 11 are distributed in a circumferential array along the stator core 1; and a winding 2, the winding 2 is connected to the stator core 1, and the winding 2 forms N layers in the radial direction of the stator core 1 inside the stator slots 11, where N is an even number; the winding 2 comprises M-phase sub-windings 21, where M is a positive integer; each phase sub-winding 21 comprises at least two parallel sub-windings 21. The at least two parallel branches 211 are rotationally symmetrically distributed around the axis of the stator core 1; each of the at least two parallel branches 211 includes a plurality of conductors 3 connected in series, and each conductor 3 of the plurality of conductors 3 spans two adjacent layers; the plurality of conductors 3 of each pole and each phase are arranged in q adjacent stator slots 11; the plurality of conductors 3 located on the radial outside of the stator core 1 and the plurality of conductors 3 located on the radial inside of the stator core 1 are staggered by one stator slot 11 along the circumferential direction of the stator core 1.

[0032] In some embodiments, the number of poles of the stator is 6, and the stator core 1 includes 54 stator slots.

[0033] The number of poles in this embodiment is 6. Fig.11 The figure shows a schematic diagram of one pole of the motor, i.e., 1 / 6 of the motor. Each of the remaining 5 poles has the same structure as the pole in this example and is arranged in an array along the same circle center. The number of poles refers to the number of magnetic poles of the motor. The magnetic poles are divided into N poles and S poles. Generally, the number of magnetic poles appears in pairs. Generally, one N pole and one S pole are called a pair of magnetic poles, that is, the number of pole pairs is 1.

[0034] like Figure 2As shown, the stator core 1 of this embodiment is a hollow cylindrical structure. The stator core 1 is provided with a plurality of stator slots 11 penetrating the stator core 1 in 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. The stator core 1 of this embodiment is provided with 54 stator slots 11. Figure 1 As shown, the winding 2 is formed by winding a plurality of conductors 3 in a plurality of stator slots 11. The conductor cross section used in this example is rectangular, i.e., flat wire winding, which is convenient for improving the slot fill rate of the winding 2, thereby improving the efficiency of the motor.

[0035] In some embodiments, the plurality of conductors 3 spans the Nth layer and the N-1th layer, and the plurality of conductors 3 are arranged in A loops between adjacent layers.

[0036] In some embodiments, the winding 2 is arranged in six layers along the radial direction of the stator core 1 inside the stator slot 11, and is sequentially the 1st layer, the 2nd layer, the 3rd layer, the 4th layer, the 5th layer and the 6th layer from the axial end farthest from the stator core 1 inward; three turns of the multiple conductors 3 are arranged between the 6th layer and the 5th layer, three turns of the multiple conductors 3 are arranged between the 4th layer and the 3rd layer, and three turns of the multiple conductors 3 are arranged between the 2nd layer and the 1st layer.

[0037] like Figure 3 As shown in FIG. 1 , it is a schematic diagram when the stator slots 11 are fully filled with conductors 3. In this example, when the stator slots 11 are fully filled with conductors 3, six layers of conductors 3 can be accommodated along the radial direction of the stator core 1. Figure 5a As shown, it is the winding diagram of the first branch 211a of the U-phase sub-winding. Taking the multiple conductors 3 between the 6th layer and the 5th layer as an example, U1 enters from the 13th slot of the 6th layer, then enters the 22nd slot of the 5th layer, the 31st slot of the 6th layer, the 40th slot of the 5th layer, the 49th slot of the 6th layer, and the 3rd slot of the 5th layer, which is the first circle; then enters the 12th slot of the 6th layer, the 21st slot of the 5th layer, the 30th slot of the 6th layer, the 39th slot of the 5th layer, the 48th slot of the 6th layer, and the 2nd slot of the 5th layer, which is the second circle; then enters the 11th slot of the 6th layer, the 20th slot of the 5th layer, the 29th slot of the 6th layer, the 38th slot of the 5th layer, the 47th slot of the 6th layer, and the 4th slot of the 5th layer, which is the third circle. This winding method is simple, simplifies the difficulty of assembly, and can also make the coils densely distributed, which is convenient for improving the efficiency of the winding.

[0038] In some embodiments, the multiple conductors 3 located in the 1st and 2nd layers of each pole and each phase are staggered by one stator slot 11 from the multiple conductors 3 located in the 3rd, 4th, 5th and 6th layers along the circumferential direction of the stator core 1; the number of slots per pole and per phase is 3.

[0039] like Fig.12As shown, taking the U-phase sub-winding of one pole as an example, the conductors 3 located at the 1st and 2nd layers are arranged in the 3rd, 4th and 5th stator slots, and the conductors 3 located at the 3rd, 4th, 5th and 6th layers are arranged in the 2nd, 3rd and 4th stator slots, that is, the number of slots per pole per phase is 3, and the number of slots per pole per phase refers to the number of slots occupied by each phase sub-winding 21 under each magnetic pole; they are staggered by one stator slot 11 along the circumference of the stator core 1 as a whole, so that the winding 2 of each pole and each phase forms an asymmetric structure; according to this rule, the positions of the remaining windings 2 of each pole can be determined, so that the winding 2 of each phase forms an asymmetric structure, and this asymmetric structure can reduce torque fluctuations.

[0040] In some embodiments, the conductor 3 includes a hairpin wire 31, and the hairpin wire 31 is provided with a left torsion segment 312a and a right torsion segment 312b, and the bending directions of the left torsion segment 312a and the right torsion segment 312b are the same; the left torsion segment 312a and the right torsion segment 312b extend out of one end of the stator core 1 along the axial direction of the stator core 1 to form a welding end 2a.

[0041] In some embodiments, the lead-in end and the lead-out end of each branch 211 are disposed on one side of the welding end 2a.

[0042] As shown in FIG5 , the conductor 3 includes a hairpin wire 31, and the hairpin wire 31 includes a left plug-in section 311a accommodated inside the stator core 1 and a right plug-in section 311b parallel to the left plug-in section 311a, and the left plug-in section 311a and the right plug-in section 311b are arranged in adjacent layers; the lower end of the left plug-in section 311a is bent in a direction away from the right plug-in section 311b to form a left torsion section 312a, and the lower end of the right plug-in section 311b is bent in a direction away from the left plug-in section 311a to form a right torsion section 312b, and the left torsion section 312a and the right torsion section 312b have the same bending direction, so When multiple hairpin wires 31 are connected along the same direction, it is convenient to form a circular winding 2, and the left torsion segment 312a and the right torsion segment 312b extend out of one end of the stator core 1 along the axial direction of the stator core 1 to form a welding end 2a; the hairpin wire 31 also includes a connecting segment 313, the left end of the connecting segment 313 is connected to the upper end of the left plug-in segment 311a, the right end of the connecting segment 313 is connected to the upper end of the right plug-in segment 311b, and the connecting segment 313 extends out of the other end of the stator core 1 along the axial direction of the stator core 1 to form a hairpin end 2b; the hairpin end 2b and the welding end 2a are located on both sides of the axial direction of the stator core 1.

[0043] The flat wire stator of this example includes three-phase sub-windings 21, specifically U-phase winding, V-phase winding and W-phase winding. The three-phase sub-windings 21 are symmetrically distributed along the circumference of the stator core 1. The sub-windings 21 of each phase include two branches 211. The lead-in end of each branch 211 is arranged on the 6th layer, and the lead-out end is arranged on the 1st layer. The lead-in end and the lead-out end of each branch 211 are spaced 8 stator slots 11 apart. This example takes the U-phase winding as an example for explanation. Figure 5a As shown, the lead-in end of the first branch 221a is arranged at slot No. 13 of the 6th layer, and the lead-out end is arranged at slot No. 4 of the 1st layer. There are 8 stator slots 11 between the lead-in end and the lead-out end. The torsion section of the hairpin wire of the lead-in end and the torsion section of the hairpin wire of the lead-out end are twisted toward each other. Therefore, the lead-in end and the lead-out end of the first branch 221a are arranged in the same radial direction of the stator core 1, which reduces the distance between the lead-in end and the lead-out end. There are also 8 stator slots 11 between the lead-in ends of each branch 211, as shown in FIG. Figure 5a FIG. 2 is a schematic diagram of the expansion of the first branch 211a of the U-phase winding, where U1 is the lead-in end and X1 is the lead-out end; Figure 5b It is a schematic diagram of the expansion of the second branch 211b of the U-phase winding, where U2 is the lead-in end and X2 is the lead-out end. There are 8 stator slots 11 between U1 and U2. The lead-in end and the lead-out end of the winding 2 can be concentrated on one side of the welding end 2a to facilitate connection with the bus.

[0044] In some embodiments, each branch 211 includes three types of hairpin lines 31 with pitch y1, pitch y2 and pitch y3. The three types of hairpin lines 31 have the same shape, and the difference lies in the different pitches; the multiple hairpin lines 31 between each adjacent layer include hairpin lines 31 with these three pitches.

[0045] The pitch is the number of stator slots spanned by the two plug-in sections of a single hairpin wire; for example, if the pitch is 8, that is, one plug-in section of the hairpin wire 31 is embedded in the 1st slot, and the other plug-in section is embedded in the 9th slot, the distance between the center lines of the two stator slots where the two plug-in sections are located is 8 slots (the 1st slot and the 9th slot are each counted as half a slot).

[0046] To facilitate understanding of the direction of the first branch 211a, the stator slot 11 No. 13 on the 6th layer is taken as the starting point of the first branch 211a, the left plug-in section 311a of each hairpin line 31 is arranged on the 6th layer, and the right plug-in section 311b of each hairpin line 31 is arranged on the 5th layer. Multiple hairpin lines 31 are arranged in three circles on the 6th and 5th layers, and the first circle and the second circle are respectively two hairpin lines 31 with a pitch y1=9 and a hairpin line 31 with a pitch y2=8, wherein the left plug-in section 311a of the first hairpin line 3 with a pitch y1=9 of the first circle is the introduction end, and the third circle is respectively two hairpin lines 31 with a pitch y1=9 and a hairpin line 31 with a pitch y3=11, and the right torsion section 312b of the hairpin line 31 with a pitch y3=11 is bent toward the 4th layer; multiple hairpin lines 31 are arranged in three circles on the 4th and 3rd layers, and the first circle and the second circle are respectively The first turn is two hairpin wires 31 with a pitch of y1=9 and one hairpin wire 31 with a pitch of y2=8, the third turn is two hairpin wires 31 with a pitch of y1=9 and one hairpin wire 31 with a pitch of y3=11, and the right twisted section 312b of the hairpin wire 31 with a pitch of y3=11 is bent toward the second layer; multiple hairpin wires 31 are arranged in three turns on the second layer and the first winding 11, the first turn is two hairpin wires 31 with a pitch of y1=9 and one hairpin wire 31 with a pitch of y2=8, the second turn is two hairpin wires 31 with a pitch of y1=9 and one hairpin wire 31 with a pitch of y3=11, the third turn is two hairpin wires 31 with a pitch of y1=9 and one hairpin wire 31 with a pitch of y2=8, and the right plug-in section 311b of the last hairpin wire 31 with a pitch of y2=8 in the third turn is used as the lead-out end, thereby forming a complete branch 211. The hairpin lines 31 of the present application have fewer types, which can simplify the processing difficulty, facilitate the connection of multiple hairpin lines 31, and improve assembly efficiency.

[0047] like Figure 5a As shown, it is a winding expansion diagram of the first branch 211a of the U-phase sub-winding 21. The first branch 211a includes a plurality of hairpin wires 31. The winding direction of the plurality of hairpin wires 31 can be clockwise or counterclockwise. In this example, they are wound in a clockwise direction. The lead-in end of each branch 211 is set on the 6th layer. According to the above rules, the winding of each branch 211 of this embodiment is explained in detail below. The flat wire stator of this embodiment includes a three-phase sub-winding 21, and the winding method of the three-phase sub-winding 21 is the same; this embodiment is explained by taking the U phase as an example. The U-phase sub-winding 21 includes a first branch 211a and a second branch 212b. The first branch 211a and the second branch 212b are rotationally symmetrically distributed along the axis of the stator core 1.

[0048] For ease of understanding, Figure 2As shown, the specific starting position of the stator slot 11 is defined. The stator core 1 of this embodiment has 54 stator slots 11, which are numbered clockwise along the circumference of the stator core 1. The numbers represent the numbers of the stator slots 11 where the plug-in sections of the hairpin wires 31 are located. Figure 3 As shown, the specific position of the plug-in section of the hairpin line 31 is defined. Figure 3 The arrow in points to the center of the stator core 1, and the numbers are numbered inward from the direction farthest from the center. L1 represents the number of the layer where the plug-in section is located; for example, 13L6 indicates that a plug-in section of the hairpin line 31 is located at the 6th layer in the 13th 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 an embodiment. Among them, [] represents a hairpin line 31 with a pitch of y2=8, () represents a hairpin line 31 with a pitch of y3=11, and each connection to a hairpin line 31 with a pitch of y3=11 realizes the layer change of the hairpin line 31, and the rest represent a hairpin line 3 with a pitch of y1=9.

[0049] like Figure 5a As shown, the winding method of the first branch 211 of the U-phase winding is as follows:

[0050] 13L6-22L5→31L6-40L5→[49L6-3L5]→12L6-21L5→30L6-39L5→[48L6-2L5]→11L6-20L5→29L6-38L 5→(47L6-4L5)→13L4-22L3→31L4-40L3→[49L4-3L3]→12L4-21L3→30L4-39L3→[48L4-2L3]→11L4- 20L3→29L4-38L3→(47L4-4L3)→13L2-22L1→31L2-40L1→[49L2-3L1]→12L2-21L1→30L2-39L1→(48L2-5L1)→14L2-23L1→32L2-41L1→[50L2-4L1]; wherein 13L6 is the lead-in terminal U1 of the first branch 211a, and 4L1 is the lead-out terminal X1 of the first branch 211a. The first branch 211a of the V-phase winding and the first branch 211a of the W-phase winding can be connected at Figure 5a The basis array is obtained.

[0051] like Figure 5b As shown, the winding method of the second branch 212 of the U-phase winding is as follows:

[0052] 22L6-31L5→40L6-49L5→[4L6-12L5]→21L6-30L5→39L6-48L5→[3L6-11L5]→20L6-29L5→38L6-47L 5→(2L6-13L5)→22L4-31L3→40L4-49L3→[4L4-12L3]→21L4-30L3→39L4-48L3→[3L4-11L3]→20L4-2 9L3→38L4-47L3→(2L4-13L3)→22L2-31L1→40L2-49L1→[4L2-12L1]→21L2-30L1→39L2-48L1→(3L2-14L1)→23L2-32L1→41L2-50L1→[5L2-13L1]; wherein 22L6 is the lead-in terminal U2 of the second branch 211b, and 13L1 is the lead-out terminal X2 of the second branch 211b. The second branch 211b of the V-phase winding and the second branch 211b of the W-phase winding can be connected at Figure 5b The basis array is obtained.

[0053] In this example, the flat wire stator also includes insulating paper, which is arranged inside the stator slot 11, specifically in the middle of the winding 2 and the stator core 1, to avoid contact between the winding 2 and the stator core 1, thereby improving the insulation performance of the motor.

[0054] The present application also provides a motor, such as Figure 6 As shown, the motor comprises a rotating shaft 4, a rotor 5, which is sleeved on the rotating shaft 4 and fixedly connected to the rotating shaft 4, and a flat wire stator as described above, which is coaxially arranged with the rotor 5. The motor is used for driving a vehicle.

[0055] The torque of a motor is the force of the motor's rotation. Torque fluctuations not only cause the motor body to vibrate, but also the parts that the motor directly or indirectly contacts will vibrate, which may cause disadvantages such as high noise, resonance, and large electromagnetic interference. Traditional same-slot same-phase windings have high torque, but also high torque fluctuations. Symmetrical same-slot different-phase windings have low torque fluctuations, but low torque. The asymmetric same-slot different-phase motor of the present application can avoid excessive torque fluctuations while meeting the torque requirement.

[0056] Referring to this embodiment, a motor with 54 slots and 6 poles has 6 winding layers.

[0057] like Figure 7 As shown in the figure, it is the traditional winding distribution diagram of one pole with the same slot and the same phase; the relationship between its peak torque and torque fluctuation is as follows Figure 8 As shown, when the peak torque is 732Nm, the torque fluctuation is 2.5%; although the motor of this solution has a large torque, the torque fluctuation also increases.

[0058] like Fig. 9 As shown in the figure, it is the traditional symmetrical winding distribution diagram of one pole with the same slot and different phases; the relationship between its peak torque and torque fluctuation is as follows Fig.10 As shown in the figure, when the peak torque is 690Nm, the torque fluctuation is 0.8%. Figure 7 For motors with the same slot and phase, this solution has small torque fluctuation, but the torque is also reduced.

[0059] like Fig.11 As shown, this is the relationship between the peak torque and torque fluctuation of the asymmetric same-slot and different-phase motor in this embodiment. When the peak torque is 723 Nm, the torque fluctuation is 1.2%. Compared with the same-slot and same-phase motors and the symmetrical same-slot and different-phase motors, while meeting the torque, the torque fluctuation is not too large, thus ensuring the performance of the motor.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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. An asymmetric same-slot different-phase flat wire stator, characterized in that: include: A stator core (1), the stator core (1) being provided with a plurality of stator slots (11), the plurality of stator slots (11) penetrating the stator core (1) along the axial direction of the stator core (1), and the plurality of stator slots (11) being distributed in an array along the circumference of the stator core (1); and A winding (2), the winding (2) being connected to the stator core (1), the winding (2) forming N layers in the interior of the stator slot (11) along the radial direction of the stator core (1), N being an even number; the winding (2) comprising M-phase sub-windings (21), M being a positive integer; the sub-winding (21) of each phase comprising at least two parallel branches (211), the at least two parallel branches (211) being rotationally symmetrically distributed around the axis of the stator core (1); the at least two parallel branches ( 211) each comprises a plurality of conductors (3) connected in series, each of the plurality of conductors (3) spanning two adjacent layers; the plurality of conductors (3) of each pole and each phase are arranged in q adjacent stator slots (11), q≧2 and q is a positive integer; the plurality of conductors (3) located radially outside the stator core (1) and the plurality of conductors (3) located radially inside the stator core (1) are staggered by one stator slot (11) along the circumferential direction of the stator core (1).

2. The flat wire stator according to claim 1, characterized in that: The plurality of conductors (3) spans the Nth layer and the N-1th layer, and the plurality of conductors (3) are arranged in A loops between adjacent layers.

3. The flat wire stator according to claim 2, characterized in that: The winding (2) is arranged in six layers along the radial direction of the stator core (1) inside the stator slot (11), and is arranged in order from the end farthest from the axis of the stator core (1) to the inside, namely, the first layer, the second layer, the third layer, the fourth layer, the fifth layer and the sixth layer; the plurality of conductors (3) are arranged in three turns between the sixth layer and the fifth layer, the plurality of conductors (3) are arranged in three turns between the fourth layer and the third layer, and the plurality of conductors (3) are arranged in three turns between the second layer and the first layer.

4. The flat wire stator according to claim 3, characterized in that: The plurality of conductors (3) located at the first and second layers of each pole and each phase and the plurality of conductors (3) located at the third, fourth, fifth and sixth layers are staggered by one stator slot (11) along the circumferential direction of the stator core (1).

5. The flat wire stator according to claim 3, characterized in that: The winding (2) comprises three-phase sub-windings (21), each phase sub-winding (21) of the three-phase sub-windings (21) comprising a first branch (211a) and a second branch (211b) connected in parallel; the lead-in ends of the first branch (211a), the first branch (211a) and the second branch (211b) are arranged on the sixth layer, and the lead-out ends of the first branch (211a) and the second branch (211b) are arranged on the first layer; and the three-phase sub-windings (21) are rotationally symmetrically distributed along the circumference of the stator core (1).

6. The flat wire stator according to claim 3, characterized in that: The conductor (3) comprises a hairpin wire (31), the hairpin wire (31) being provided with a left twisting section (312a) and a right plug-in section (311b), the left twisting section (312a) and the right twisting section (312b) having the same bending direction; the left twisting section (312a) and the right twisting section (312b) extending out of one end of the stator core (1) along the axial direction of the stator core (1) to form a welding end (2a).

7. The flat wire stator according to claim 6, characterized in that: The lead-in end and the lead-out end of each branch (211) are arranged on one side of the welding end (2a).

8. The flat wire stator according to claim 6, characterized in that: Each branch (211) includes three types of hairpin lines (31) with a pitch of y1, a pitch of y2, and a pitch of y3. The three types of hairpin lines (31) have the same shape, but differ in that the pitches are different. Each adjacent layer includes hairpin lines (31) with three different pitches.

9. The flat wire stator according to claim 1, characterized in that: The number of poles of the flat wire stator is 6, and the stator core (1) comprises 54 stator slots (11).

10. A motor, characterized in that: The motor comprises: A rotating shaft (4); a rotor (5), wherein the rotor (5) is sleeved on the rotating shaft (4); and The flat wire stator according to any one of claims 1 to 9 is coaxially arranged with the rotor (5).

Images