8-pole 48-slot flat wire winding structure, odd-layer flat wire stator and motor
By using equally spaced single-phase windings and regularly arranged welded ends in the 8-pole 48-slot flat wire winding structure, the problems of poor insulation effect and phase difference in odd-numbered winding layers are solved, achieving efficient insulation and simplified welding, thus improving motor performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-03-24
AI Technical Summary
Existing odd-layer flat wire windings are costly in terms of insulation performance and have phase difference issues, which affect motor performance.
It adopts an 8-pole 48-slot flat wire winding structure. The three-phase windings are inserted at equal intervals in the stator slots. The single-phase windings are distributed alternately by the first branch and the second branch. The welded ends are arranged in a regular pattern on the stator core. I-type and U-type hairpins are used to connect and form a regular current path.
It improves the symmetry of odd-numbered winding layers, avoids phase differences, enhances insulation performance, reduces production costs, simplifies welding processes, and improves production efficiency.
Smart Images
Figure CN224037168U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flat wire motor technology, specifically to an 8-pole 48-slot flat wire winding structure, an odd-layer flat wire stator, and a motor. Background Technology
[0002] The stator windings of flat-wire motors use flat conductors (often called "hairpin" or "U-shaped") instead of traditional round conductors. The difference between them and traditional permanent magnet synchronous motors lies in the structure and manufacturing process of the stator windings, which determines the difference between the harmonic winding coefficients and the fundamental winding coefficients. Specifically, the stator windings of flat-wire motors include even-numbered and odd-numbered layers. Even-numbered layers are more prone to introducing higher harmonics, increasing NVH (noise, vibration, and harshness). Odd-numbered layers effectively attenuate the 5th and 7th harmonics, showing a better attenuation effect on higher harmonics compared to even-numbered layers.
[0003] However, existing odd-layer windings have many types of hairpins, and each stator slot contains multi-phase windings, resulting in a phase difference within each stator slot. Existing odd-layer windings typically use insulating coatings to ensure their insulation effect, but the insulation effect of this method depends on the quality of the insulating coating, which increases production costs. Utility Model Content
[0004] This utility model addresses the problem of high cost in achieving insulation effects with odd-numbered layer windings by providing an 8-pole, 48-slot flat wire winding structure, an odd-numbered layer flat wire stator, and a motor. The specific technical solution is as follows:
[0005] An 8-pole, 48-slot flat wire winding structure is disclosed. The flat wire winding is used to cooperate with stator slots. Multiple stator slots are formed on the inner wall of the stator core. The flat wire winding includes a three-phase winding. The three-phase winding forms M layers along the radial direction of the stator core inside each of the multiple stator slots. M is an odd number and M≥3. The three-phase winding includes a single-phase winding. The single-phase winding is inserted into the M layers of the stator slot at equal intervals along the circumference. The single-phase winding includes a first branch and a second branch arranged along the circumference. The first branch and the second branch of each stage are inserted together into the M layers of two adjacent stator slots.
[0006] Furthermore, both the first and second branches are divided into part A and part B. Part A is inserted into two adjacent stator slots, and part B is inserted into the M layer of the same stator slot. Part A and part B are alternately distributed along the circumference of the stator core. Specifically, part A of the first branch and part A of the second branch are alternately inserted into the M layer of two adjacent stator slots, and part B of the first branch and part B of the second branch are respectively inserted into the M layer of two adjacent stator slots.
[0007] Preferably, both the first branch and the second branch include a welded end and a closed end disposed at both axial ends of the stator core. The welded ends alternately form N layers and N-2 layers along the radial direction of the stator core inside each of the multiple stator slots, where N is an even number and N≥4. The welded ends of the first branch alternately form N layers and N-2 layers along the circumferential direction, and the welded ends of the second branch also alternately form N layers and N-2 layers along the circumferential direction. The first branch and the second branch of each stage of the single-phase winding form the same number of layers. The projection span of the welded ends on the stator core is equal.
[0008] Preferably, both the first branch and the second branch include a plurality of first hairpins, a plurality of second hairpins, a plurality of third hairpins, a plurality of fourth hairpins, a plurality of fifth hairpins, and a plurality of sixth hairpins. The welding ends of the first hairpins, the fifth hairpins, and the sixth hairpins are all closest to the stator core axis. The welding ends of the second hairpins and the fourth hairpins are located in the same stator slot along the projection of the stator core. The welding ends of the third hairpins are located in the Nth layer and the N-2th layer, respectively, which are furthest from the stator core axis.
[0009] Preferably, the first hairpin has an I-shaped structure, and a first bend is provided at the welding end. The first bend is connected to a first connecting end. The other end of the first hairpin is a closed end, and a lead-out end or a neutral end is provided at the closed end. The second and fourth hairpins are both U-shaped structures, and the openings are respectively provided with opposing second bends and fourth bends. The second bends are connected to second connecting ends of equal length, and the fourth bends are connected to fourth connecting ends of equal length. The third, fifth, and sixth hairpins are all U-shaped structures, and the openings are respectively provided with unidirectional third bends, fifth bends, and sixth bends. The third bends, fifth bends, and sixth bends are respectively connected to third connecting ends, fifth connecting ends, and sixth connecting ends of equal length. The bottom of the U-shaped structure forms a closed end.
[0010] Preferably, the first branch is formed by sequentially connecting the connection ends of the first card, the second card, the third card, the fourth card, the second card, the fifth card, the second card, the third card, the fourth card, the second card, the sixth card, the second card, the third card, the fourth card, the second card, the fifth card, the second card, the third card, the fourth card, the second card, and the first card.
[0011] Preferably, the second branch is formed by sequentially connecting the connection ends of the first card, the second card, the third card, the fourth card, the second card, the sixth card, the second card, the third card, the fourth card, the second card, the fifth card, the second card, the third card, the fourth card, the second card, the sixth card, the second card, the third card, the fourth card, the second card, and the first card.
[0012] An odd-layer flat wire stator includes: a stator core, the inner wall of which is evenly distributed with 4L stator slots, where L is a positive integer; the stator core also includes insulating paper disposed inside the stator slots; and an 8-pole 48-slot flat wire winding structure that cooperates with the stator slots.
[0013] An electric motor, including a motor stator.
[0014] As can be seen from the above technical solution, this utility model has the following beneficial effects:
[0015] This invention improves the symmetry of odd-numbered layers of windings by setting single-phase windings that are equally spaced and inserted into the stator slots. Secondly, each stage and each phase is provided with a first branch and a second branch that are jointly inserted into the M-layer stator slots, so that there are in-phase windings in all M-layer stator slots, avoiding the occurrence of phase differences between different phases, thereby improving the insulation effect without improving the quality of the insulation coating. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the odd-layer flat wire stator of this utility model;
[0017] Figure 2 This is a schematic diagram of a single-phase winding embodiment.
[0018] Figure 3 This is a cross-sectional schematic diagram of a single-phase winding embodiment;
[0019] Figure 4 This is a schematic diagram of the structure of the first branch embodiment;
[0020] Figure 5 This is a schematic diagram of the structure of the second branch embodiment;
[0021] Figure 6 This is a schematic diagram of the structure of the first card issuing embodiment;
[0022] Figure 7 This is a schematic diagram of the structure of the second card issuing embodiment;
[0023] Figure 8 This is a schematic diagram of the structure of the third card issuing embodiment;
[0024] Figure 9 This is a schematic diagram of the structure of the fourth card issuing embodiment;
[0025] Figure 10 This is a schematic diagram of the structure of the fifth card issuance embodiment.
[0026] Figure 11 This is a schematic diagram of the structure of the sixth card-issuing embodiment;
[0027] Figure 12 This is the unfolded diagram of a three-phase winding.
[0028] In the diagram: 1. Stator core; 11. Stator slot; 12. Insulating paper; 2. Single-phase winding; 21. First branch; 22. Second branch; 23. Welded end; 24. Closed end; 25. Lead-out end; 26. Neutral end; 4. First hairpin; 41. First bend; 42. First connection end; 5. Second hairpin; 51. Second bend; 52. Second connection end; 6. Third hairpin; 61. Third bend; 62. Third connection end; 7. Fourth hairpin; 71. Fourth bend; 72. Fourth connection end; 8. Fifth hairpin; 81. Fifth bend; 82. Fifth connection end; 9. Sixth hairpin; 91. Sixth bend; 92. Sixth connection end. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0031] Example 1
[0032] like Figure 1 As shown, Embodiment 1 is an 8-level 48-slot flat wire winding, which is used to cooperate with stator slots 11. Multiple stator slots 11 are formed on the inner wall of stator core 1. The flat wire winding includes a three-phase winding.
[0033] Specifically, the stator core 1 is made of a certain number of silicon steel sheets stacked together, which can be done by riveting, welding or bonding. The inner wall of the stator core 1 forms 48 stator slots 11 along the axial direction. Flat wires are inserted into the stator slots 11 to form a three-phase winding. The three-phase winding includes lead-out terminals 25 and a center terminal. Lead-out terminals 25 are directly connected to external equipment for power supply. The center terminal refers to the common connection point of the three-phase winding, which can balance the three-phase current and prevent the current in one phase from being too large, thereby protecting the motor from overload damage.
[0034] like Figure 2 and Figure 3The three-phase winding forms an M-layer along the radial direction of the stator core 1 inside each of the multiple stator slots 11, where M is an odd number and M≥3. The three-phase winding includes a single-phase winding 2, which is inserted into the M-layer of the stator slot 11 at equal intervals along the circumference. The single-phase winding 2 includes a first branch 21 and a second branch 22 arranged along the circumference. The first branch 21 and the second branch 22 of each stage are inserted into the M-layer of two adjacent stator slots 11.
[0035] Specifically, in Embodiment 1, the three-phase windings form 5 layers in each stator slot 11, and from the axis of the stator core 1 outwards, they are layer 1, layer 2, layer 3, layer 4 and layer 5 respectively; secondly, the three-phase windings include U-phase windings, V-phase windings and W-phase windings. Each phase winding has the same structure, but there is a phase difference when the three are energized with alternating current. After their superposition, the amplitude of the synthesized magnetomotive force is smaller, thereby reducing torque pulsation and electromagnetic noise, effectively weakening high-order harmonics and reducing NVH.
[0036] Secondly, the single-phase winding 2 forms 6 levels, with each level spanning 6 stator slots 11. Each level is inserted into all 5 layers of 2 adjacent stator slots 11, so that each stator slot 11 contains in-phase windings, thereby avoiding large phase differences between coils and improving their insulation effect.
[0037] like Figure 3 As shown, the single-phase winding 2 includes a first branch 21 and a second branch 22. The dark part in the figure is the first branch 21, and the light part is the second branch 22. Each stage of the single-phase winding 2 includes a first branch 21 and a second branch 22. The first branch 21 and the second branch 22 of each stage form a stator slot 11 filled with 5 layers through different combinations, so that each stator slot 11 contains the winding of the same phase, thereby eliminating the phase difference within the stator slot 11 and improving the insulation effect of the odd-numbered layers of flat wire windings. Furthermore, the welding points of the flat wire windings inserted into the stator slot 11 are arranged radially, making the welding point distribution regular.
[0038] Furthermore, both the first branch 21 and the second branch 22 are divided into part A and part B. Part A is inserted into two adjacent stator slots 11, and part B is inserted into the M layer of the same stator slot 11. Part A and part B are alternately distributed along the circumference of the stator core 1. Part A of the first branch 21 and part A of the second branch 22 are alternately inserted into the M layer of two adjacent stator slots 11, and part B of the first branch 21 and part B of the second branch 22 are respectively inserted into the M layer of two adjacent stator slots 11.
[0039] Specifically, part A of the first branch 21 is inserted into the 5th layer of the same stator slot 11, and part B of the first branch 21 is inserted into the 2nd and 4th layers of the same stator slot 11, as well as the 1st, 3rd and 5th layers of adjacent stator slots 11. Part A of the second branch 22 is inserted into the stator slot 11 adjacent to the stator slot 11 where part A of the first branch 21 is inserted, forming a single-stage single-phase winding 2. Part B of the second branch 22 is inserted into the 1st, 3rd and 5th layers corresponding to part B of the first branch 21, as well as the 2nd and 4th layers of adjacent stator slots 11, forming a single-stage single-phase winding 2. Parts A and B are alternately distributed circumferentially, thereby increasing the cross-flow path of the current.
[0040] like Figure 4 and Figure 5 As shown, both the first branch 21 and the second branch 22 include a welding end 23 and a closed end 24 disposed at both axial ends of the stator core 1. The welding end 23 alternately forms N layers and N-2 layers along the radial direction of the stator core 1 inside each of the plurality of stator slots 11, where N is an even number and N≥4. The welding end 23 of the first branch 21 alternately forms N layers and N-2 layers along the circumferential direction, and the welding end 23 of the second branch 22 also alternately forms N layers and N-2 layers along the circumferential direction. The first branch 21 and the second branch 22 of each stage of the single-phase winding 2 form the same number of layers. The span of the projection of the welding end 23 on the stator core 1 is equal.
[0041] Specifically, the closed ends 24 of the first branch 21 and the second branch 22 are connected by U-shaped conductors to straight conductors inserted in the stator slots 11 to form a current path. Furthermore, both are connected by welding ends 23 to form a complete path to form a single-phase winding 2. The welding ends 23 are located at one end of the stator slots 11, and are formed in 6 layers and 4 layers along the radial direction of the stator core 1. The span of the welding ends 23 in the 6 layers and 4 layers is the same, which is 3 stator slots 11. At the same time, the welding ends 23 in the 6 layers and 4 layers are alternately distributed at intervals of 6 stator slots 11 to form a regularly arranged welding end 23.
[0042] Secondly, in the same stage of single-phase winding 2, the number of layers of welding ends 23 of the first branch 21 and the second branch 22 are equal, and they are alternately distributed with 6 layers and 4 layers respectively. This makes the welding ends 23 in each stage of single-phase winding 2 adjacent and equal in number of layers. As a result, single-phase winding 2 can form regularly arranged welding points, simplify the welding process, and improve the production efficiency of odd-numbered layer flat wire stators.
[0043] like Figures 4 to 11As shown, both the first branch 21 and the second branch 22 include several first hairpins 4, several second hairpins 5, several third hairpins 6, several fourth hairpins 7, several fifth hairpins 8 and several sixth hairpins 9. The welding ends 23 of the first hairpins 4, the fifth hairpins 8 and the sixth hairpins 9 are closest to the axis of the stator core 1. The welding ends 23 of the second hairpins 5 and the fourth hairpins 7 are located in the same stator slot 11 along the projection of the stator core 1. The welding ends 23 of the third hairpins 6 are located in the Nth layer and the N-2th layer, respectively, which are furthest from the axis of the stator core 1.
[0044] Specifically, the number of layers of the welding end 23 along the radial direction of the stator core 1 from the inside to the outside are layer A, layer B, layer C, layer D, layer E, and layer F. The first hairpin 4, the fifth hairpin 8, and the sixth hairpin 9 form the inner layer coil, wherein the welding end 23 of the first hairpin 4, the fifth hairpin 8, and the sixth hairpin 9 are all located in layer A. The welding ends 23 of the second hairpin 5 and the fourth hairpin 7 are all located in the same radial direction (the same radial direction means that the projection of the welding end 23 on the stator core 1 is the diameter direction of the stator core 1), but the two welding ends 23 of the two are located in different layers. The third hairpin 6 forms two welding ends 23, one of which is located in layer D, and the other is located in layer F with a staggered span.
[0045] Among them, the welding ends 23 of the second hairpin 5 and the fourth hairpin 7 are located in different layers of the same stator slot 11 along the projection of the stator core 1. The two are connected by the welding ends 23. The first hairpin 4, the fifth hairpin 8 and the sixth hairpin 9 are used to connect the second hairpin 5 of different levels of the single-phase winding 2. The third hairpin 6 is used to connect the fourth hairpin 7 and the second hairpin 5 of different levels of the single-phase winding 2, thereby forming a regular distribution of welding points.
[0046] Furthermore, the first hairpin 4 has an I-shaped structure, and a first bending portion 41 is provided at the welding end 23 position. The first bending portion 41 is connected to a first connecting end 42. The other end of the first hairpin 4 is a closed end 24, and a lead-out end 25 or a neutral end 26 is provided at the closed end 24 position.
[0047] Specifically, the straight conductor of the first hairpin 4 inserted into the stator slot 11 is of type I, and one end of it located at the welding end 23 is connected to a first bend 41. The torque of the first bend 41 is the same as the torque of the welding end 23, both being 3. Secondly, the first bend 41 of the welding end 23 is connected to a first connecting end 42. The first hairpin 4 is connected to other hairpins through the first connecting end 42 to form a single-phase winding 2. Secondly, the first hairpin 4 located at the closed end 24 is connected to a first bend 41. The first bend 41 is connected to a lead-out end 25 or a neutral end 26 with a length greater than the first connecting end 42. The first bend 41 of the first hairpin 4 located at the welding end 23 and the closed end 24 have complementary inclination angles compared to the straight conductor. The length directions of the first connecting end 42, the lead-out end 25 and the neutral end 26 are all parallel to the axial direction of the stator core 1.
[0048] Furthermore, both the second hairpin 5 and the fourth hairpin 7 are U-shaped structures, and the openings are respectively provided with opposing second bends 51 and fourth bends 71. The second bend 51 is connected to a second connecting end 52 of equal length, and the fourth bend 71 is connected to a fourth connecting end 72 of equal length.
[0049] Specifically, the second hairpin 5 and the fourth hairpin 7 are inserted into the stator slot 11 as two parallel straight conductors. Their closed ends 24 are connected by U-shaped conductors, and their welding ends 23 are their open ends. Each of their openings is connected to two second bends 51 and two fourth bends 71. The second bends 51 and the fourth bends 71 have the same torque as the first bend 41. The two bends are arranged facing each other and are located in the same radial direction but at different layers of the welding ends 23. The second bends 51 are connected to the second connecting ends 52 that are the same as the first connecting ends 42, and the fourth bends 71 are connected to the fourth connecting ends 72 that are the same as the second connecting ends 52, thereby making the welding ends 23 regularly arranged.
[0050] Furthermore, the third hairpin 6, the fifth hairpin 8, and the sixth hairpin 9 are all U-shaped structures, and the openings are respectively provided with a third bend 61, a fifth bend 81, and a sixth bend 91 in the same direction. The third bend 61, the fifth bend 81, and the sixth bend 91 are respectively connected to a third connecting end 62, a fifth connecting end 82, and a sixth connecting end 92 of equal length.
[0051] Specifically, the third hairpin 6, the fifth hairpin 8, and the sixth hairpin 9 inserted into the stator slot 11 are all two parallel straight conductors, and their closed ends 24 are all connected by U-shaped conductors. Their welding ends 23 are all open ends. The openings of the third hairpin 6, the fifth hairpin 8, and the sixth hairpin 9 are all connected to two third bends 61, two fifth bends 81, and two sixth bends 91. The third bends 61, the fifth bends 81, and the sixth bends 91 all have the same torque as the first bend 41, which is 3. The two bends are arranged in the same direction at different layers on the welding end 23. The third bends 61, the fifth bends 81, and the sixth bends 91 are all connected to the same third connection end 62, fifth connection end 82, and sixth connection end 92 as the first connection end 42, so that the welding ends 23 are arranged regularly.
[0052] Secondly, the two ends of the fifth connection terminal 82 and the sixth connection terminal 92 are respectively connected to the second connection terminal 52 of the adjacent stage of the single-phase winding 2. The second connection terminal 52 is connected to the first connection terminal 42 and the fourth connection terminal 72 respectively. The fourth connection terminal 72 is connected to the third connection terminal 62 to form the same radial 6-layer welding end 23. The second connection terminal 52 is connected to the first connection terminal 42 and the third connection terminal 62 respectively to form the same radial 4-layer welding end 23. The 6-layer welding end 23 and the 4-layer welding end 23 are arranged alternately along the circumference of the stator core 1 to form a regularly distributed welding end 23, thereby forming a regularly arranged welding point, simplifying the welding process and improving production efficiency.
[0053] Furthermore, the bottom of the U-shaped structure forms a closed end 24.
[0054] Specifically, the U-shaped structure is formed by parallel straight conductors inserted in the stator slot 11 and U-shaped conductors connecting the straight conductors. The U-shaped conductors form a closed end 24, thereby enabling different hairpins to form a complete current path.
[0055] Furthermore, the first branch 21 is formed by sequentially connecting the first hairpin 4, the second hairpin 5, the third hairpin 6, the fourth hairpin 7, the second hairpin 5, the fifth hairpin 8, the second hairpin 5, the third hairpin 6, the fourth hairpin 7, the second hairpin 5, the sixth hairpin 9, the second hairpin 5, the third hairpin 6, the fourth hairpin 7, the second hairpin 5, the fifth hairpin 8, the second hairpin 5, the third hairpin 6, the fourth hairpin 7, the second hairpin 5, and the connecting end of the first hairpin 4.
[0056] Specifically, the second hairpin 5 has a span of 6, the second bends 51 are set facing each other, the second connecting end 52 has a span of 0, the third hairpin 6 has a span of 6, the third bends 61 are set in the same direction, the third connecting end 62 has a span of 6, the fourth hairpin 7 has a span of 6, the fourth bends 71 are set facing each other, the fourth connecting end 72 has a span of 0, the fifth hairpin 8 has a span of 7, the fifth bends 81 are set in the same direction, the fifth connecting end 82 has a span of 7, the sixth hairpin 9 has a span of 5, the sixth bends 91 are set in the same direction, the sixth connecting end 92 has a span of 5, and the connection method of the first branch 21 is as follows:
[0057] The first hairpin 4 starts from the first connecting end 42 of the welding end 23A layer. The first connecting end 42 of layer A connects to the second connecting end 52 of layer B. The second connecting end 52 of layer C connects to the third connecting end 62 of layer D. The third connecting end 62 of layer F connects to the fourth connecting end 72 of layer E. The fourth connecting end 72 of layer D connects to the second connecting end 52 of layer C. The second connecting end 52 of layer B connects to the fifth connecting end 82 of layer A. Another fifth connecting end 82 of layer A connects to the second connecting end 52 of layer B. The second connecting end 52 of layer C connects to the third connecting end 62 of layer D. The third connecting end 62 of layer F connects to the fourth connecting end 72 of layer E. The fourth connecting end 72 of layer D connects to the second connecting end 52 of layer C. The second connecting end 52 of layer B connects to the sixth connecting end 92 of layer A. The sixth connection end 92 of layer A is connected to the second connection end 52 of layer B, the second connection end 52 of layer C is connected to the third connection end 62 of layer D, the third connection end 62 of layer F is connected to the fourth connection end 72 of layer E, the fourth connection end 72 of layer D is connected to the second connection end 52 of layer C, the second connection end 52 of layer B is connected to the fifth connection end 82 of layer A, the other fifth connection end 82 of layer A is connected to the second connection end 52 of layer B, the second connection end 52 of layer C is connected to the third connection end 62 of layer D, the third connection end 62 of layer F is connected to the fourth connection end 72 of layer E, the fourth connection end 72 of layer D is connected to the second connection end 52 of layer C, and the second connection end 52 of layer B is connected to the first connection end 42 of layer A. At this time, the first hairpin 4 is connected to the neutral end 26 of the closed end 24 and the first bending part 41.
[0058] Furthermore, the second branch 22 is formed by sequentially connecting the connecting ends of the first hairpin 4, the second hairpin 5, the third hairpin 6, the fourth hairpin 7, the second hairpin 5, the sixth hairpin 9, the second hairpin 5, the third hairpin 6, the fourth hairpin 7, the second hairpin 5, the fifth hairpin 8, the second hairpin 5, the third hairpin 6, the fourth hairpin 7, the second hairpin 5, the sixth hairpin 9, the second hairpin 5, the third hairpin 6, the fourth hairpin 7, the second hairpin 5, and the first hairpin 4.
[0059] Specifically, the second hairpin 5 has a span of 6, the second bends 51 are set facing each other, the second connecting end 52 has a span of 0, the third hairpin 6 has a span of 6, the third bends 61 are set in the same direction, the third connecting end 62 has a span of 6, the fourth hairpin 7 has a span of 6, the fourth bends 71 are set facing each other, the fourth connecting end 72 has a span of 0, the fifth hairpin 8 has a span of 7, the fifth bends 81 are set in the same direction, the fifth connecting end 82 has a span of 7, the sixth hairpin 9 has a span of 5, the sixth bends 91 are set in the same direction, the sixth connecting end 92 has a span of 5, and the connection method of the second branch 22 is as follows:
[0060] The first hairpin 4 starts from the first connecting end 42 of the welding end 23A layer. The first connecting end 42 of layer A connects to the second connecting end 52 of layer B. The second connecting end 52 of layer C connects to the third connecting end 62 of layer D. The third connecting end 62 of layer F connects to the fourth connecting end 72 of layer E. The fourth connecting end 72 of layer D connects to the second connecting end 52 of layer C. The second connecting end 52 of layer B connects to the sixth connecting end 92 of layer A. Another sixth connecting end 92 of layer A connects to the second connecting end 52 of layer B. The second connecting end 52 of layer C connects to the third connecting end 62 of layer D. The third connecting end 62 of layer F connects to the fourth connecting end 72 of layer E. The fourth connecting end 72 of layer D connects to the second connecting end 52 of layer C. The second connecting end 52 of layer B connects to the fifth connecting end 82 of layer A. Another fifth connection end 82 on layer A is connected to the second connection end 52 on layer B; the second connection end 52 on layer C is connected to the third connection end 62 on layer D; the third connection end 62 on layer F is connected to the fourth connection end 72 on layer E; the fourth connection end 72 on layer D is connected to the second connection end 52 on layer C; the second connection end 52 on layer B is connected to the sixth connection end 92 on layer A; another sixth connection end 92 on layer A is connected to the second connection end 52 on layer B; the second connection end 52 on layer C is connected to the third connection end 62 on layer D; the third connection end 62 on layer F is connected to the fourth connection end 72 on layer E; the fourth connection end 72 on layer D is connected to the second connection end 52 on layer C; the second connection end 52 on layer B is connected to the first connection end 42 on layer A. At this time, the first hairpin 4 is connected to the neutral end 26 at the closed end 24 and the first bending part 41.
[0061] like Figure 12 This is an unfolded diagram of a three-phase winding, where numbers 1-48 indicate that the three-phase winding is installed in 48 stator slots 11. In addition, A1+, A2+, B1+, B2+, C1+, and C2+ in the diagram represent the lead-out terminals 25 of each branch of the three-phase winding, and A1-, A2-, B1-, B2-, C1-, and C2- represent the neutral terminals 26 of each branch of the three-phase winding.
[0062] Example 2
[0063] This second embodiment is an odd-numbered layer flat wire stator, including: a stator core 1, the inner wall of the stator core 1 is evenly distributed with 4L stator slots 11, where L is a positive integer, the stator core 1 also includes insulating paper 12 disposed inside the stator slots 11; and the first embodiment that cooperates with the stator slots 11.
[0064] Specifically, the stator core 1 is made of a certain number of stacked silicon steel sheets, which can be formed by riveting, welding, or bonding. Considering insulation, insulating paper 12 of a certain thickness is inserted into the stator slots 11. There are 48 stator slots 11, and straight conductors with hairpins are inserted into each of the 48 slots 11. Five hairpins can be inserted into each slot. To achieve electrical connection between the conductors in the 48 stator slots 11, methods such as hairpins or welding are required.
[0065] Secondly, the stator slot 11 is wound with the first embodiment, which enables the second embodiment to effectively weaken high-order harmonics, and the symmetrical cross-layer connection method makes the welding points distributed regularly.
[0066] Example 3
[0067] This embodiment is a motor, including the odd-numbered layer flat wire stator of Embodiment 2, thereby reducing its NVH.
[0068] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
[0069] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.
Claims
1. An 8-pole, 48-slot flat wire winding structure, wherein the flat wire winding is used to cooperate with stator slots (11), and a plurality of stator slots (11) are formed on the inner wall of a stator core (1), characterized in that, The flat wire winding includes a three-phase winding, wherein the three-phase winding forms an M-layer along the radial direction of the stator core (1) inside each of the plurality of stator slots (11), where M is an odd number and M≥3, and the three-phase winding includes a single-phase winding (2), wherein the single-phase winding (2) is inserted in the M-layer of the stator slot (11) at equal intervals along the circumference; The single-phase winding (2) includes a first branch (21) and a second branch (22) arranged circumferentially. The first branch (21) and the second branch (22) of each stage are inserted together in the M layer of two adjacent stator slots (11).
2. The 8-pole 48-slot flat wire winding structure according to claim 1, characterized in that: Both the first branch (21) and the second branch (22) are divided into part A and part B. Part A is inserted into two adjacent stator slots (11), and part B is inserted into the M layer of the same stator slot (11). Part A and part B are alternately distributed along the circumference of the stator core (1). The A part of the first branch (21) and the A part of the second branch (22) are alternately inserted into the M layer of two adjacent stator slots (11), and the B part of the first branch (21) and the B part of the second branch (22) are respectively inserted into the M layer of two adjacent stator slots (11).
3. The 8-pole 48-slot flat wire winding structure according to claim 1, characterized in that: The first branch (21) and the second branch (22) each include a welded end (23) and a closed end (24) disposed at both ends of the stator core (1) along the axial direction. The welded end (23) is formed in N layers and N-2 layers alternately in the radial direction of the stator core (1) inside each of the plurality of stator slots (11), where N is an even number and N≥4; The welding end (23) of the first branch (21) alternates N layers and N-2 layers in the circumferential direction, and the welding end (23) of the second branch (22) also alternates N layers and N-2 layers in the circumferential direction. The first branch (21) and the second branch (22) of each stage of the single-phase winding (2) form the same number of layers. The projection span of the welded end (23) on the stator core (1) is equal.
4. The 8-pole 48-slot flat wire winding structure according to claim 1, characterized in that: Both the first branch (21) and the second branch (22) include a number of first hairpins (4), a number of second hairpins (5), a number of third hairpins (6), a number of fourth hairpins (7), a number of fifth hairpins (8) and a number of sixth hairpins (9). The welding ends (23) of the first hairpins (4), the fifth hairpins (8) and the sixth hairpins (9) are closest to the axis of the stator core (1). The welding ends (23) of the second hairpins (5) and the fourth hairpins (7) are located in the same stator slot (11) along the projection of the stator core (1). The welding ends (23) of the third hairpins (6) are located in the Nth layer and the N-2th layer, respectively, which are furthest from the axis of the stator core (1).
5. The 8-pole 48-slot flat wire winding structure according to claim 4, characterized in that: The first hairpin (4) has an I-shaped structure, and a first bending part (41) is provided at the welding end (23) position. The first bending part (41) is connected to a first connecting end (42). The other end of the first hairpin (4) is a closed end (24), and a lead-out end (25) or a neutral end (26) is provided at the closed end (24) position. The second hairpin (5) and the fourth hairpin (7) are both U-shaped structures, and the openings are respectively provided with opposing second bends (51) and fourth bends (71). The second bend (51) is connected to a second connecting end (52) of equal length, and the fourth bend (71) is connected to a fourth connecting end (72) of equal length. The third hairpin (6), the fifth hairpin (8) and the sixth hairpin (9) are all U-shaped structures, and the openings are respectively provided with a third bend (61), a fifth bend (81) and a sixth bend (91) in the same direction. The third bend (61), the fifth bend (81) and the sixth bend (91) are respectively connected to a third connecting end (62), a fifth connecting end (82) and a sixth connecting end (92) of equal length. The bottom of the U-shaped structure forms the closed end (24).
6. The 8-pole 48-slot flat wire winding structure according to claim 4, characterized in that: The first branch (21) is formed by sequentially connecting the connecting ends of the first hairpin (4), the second hairpin (5), the third hairpin (6), the fourth hairpin (7), the second hairpin (5), the fifth hairpin (8), the second hairpin (5), the third hairpin (6), the fourth hairpin (7), the second hairpin (5), the sixth hairpin (9), the second hairpin (5), the third hairpin (6), the fourth hairpin (7), the second hairpin (5), the fifth hairpin (8), the second hairpin (5), the third hairpin (6), the fourth hairpin (7), the second hairpin (5), and the first hairpin (4).
7. The 8-pole 48-slot flat wire winding structure according to claim 4, characterized in that: The second branch (22) is formed by connecting the first hairpin (4), the second hairpin (5), the third hairpin (6), the fourth hairpin (7), the second hairpin (5), the sixth hairpin (9), the second hairpin (5), the third hairpin (6), the fourth hairpin (7), the second hairpin (5), the fifth hairpin (8), the second hairpin (5), the third hairpin (6), the fourth hairpin (7), the second hairpin (5), the sixth hairpin (9), the second hairpin (5), the third hairpin (6), the fourth hairpin (7), the second hairpin (5), and the first hairpin (4) in sequence.
8. A stator with an odd number of flat wire layers, characterized in that, include: Stator core (1), the inner wall of the stator core (1) is evenly distributed with 4L stator slots (11), where L is a positive integer, the stator core (1) also includes insulating paper (12) disposed inside the stator slots (11); The 8-pole 48-slot flat wire winding structure as described in any one of claims 1 to 7, which cooperates with the stator slot (11).
9. An electric motor, characterized in that, Includes the motor stator as described in claim 8.