Flat wire stator and motor

Abstract

The utility model provides a flat wire stator. The flat wire stator comprises a stator core and a flat wire winding. 18m stator slots are uniformly arranged on the inner wall of the stator core along the circumferential direction, the stator slots are divided into 2n layers along the radial direction of the stator core, and the flat wire windings are wound in the stator slots; the flat wire winding comprises a U-phase winding, a V-phase winding and a W-phase winding, each phase winding comprises p parallel branches, each parallel branch comprises q flat wire coils which are connected in series, q is equal to 6mn / p, each flat wire coil comprises two insertion ends, the two insertion ends are respectively inserted into 2i and 2i-1 layers of the stator slots, i is greater than or equal to 1 and less than or equal to n, and i is a positive integer; the pitches between the two insertion ends of the flat wire coil are 7, 8, 10 and 11 stator slots; wherein m, n, p, q and i are integers greater than or equal to 1. And under the condition of keeping fewer line types, a flat wire winding connection scheme which is universal for motor electrical balance, winding layer number balance and different voltage platforms is realized.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to a flat wire stator and a motor. Background Art

[0002] The drive motor is mainly composed of a stator assembly, a rotor assembly, an end cover and auxiliary standard parts. The stator assembly is composed of an iron core, copper wire windings, lead wires, insulation materials, etc. The stator assembly is the key to determining the performance of the motor.

[0003] To improve the motor's torque and power density, flat wire windings (rectangular conductors) are placed within the stator core's stator slots. Compared to traditional motors using round wire windings, this significantly increases the stator winding slot fill rate, saves volume, and reduces copper loss, providing superior acceleration performance.

[0004] However, since flat wire winding generally adopts the process of conductor forming, wire insertion, wire twisting, and twisted wire side welding, the process is relatively complicated. If the flat wire winding is incompatible, it will lead to excessive investment in flat wire winding forming equipment and molds for a single model of motor, and the cost is too high. Secondly, there are many combinations of the number of stator winding layers and the number of parallel branches of the flat wire motor. It is difficult to find a flat wire winding connection solution with fewer wire types, electrical balance, balanced number of winding layers and strong versatility. Utility Model Content

[0005] The present application aims to provide a flat wire stator and motor, which can achieve motor electrical balance, winding layer balance and a flat wire winding connection solution that is universal for different voltage platforms while maintaining a small number of wire types. At the same time, it can reduce the equipment investment ratio and improve the utilization rate of equipment and motors, thereby achieving the goal of comprehensive cost reduction.

[0006] In a first aspect, an embodiment of the present application provides a flat wire stator, comprising a stator core and a flat wire winding; the inner wall of the stator core is uniformly provided with 18m stator slots along the circumferential direction, the stator slots are divided into 2n layers along the radial direction of the core, and the flat wire winding is wound in the stator slots;

[0007] The flat wire winding includes three-phase windings U, V, and W, each phase winding includes p parallel branches, each parallel branch includes q series-connected flat wire coils, q=6mn / p, the flat wire coil includes two insertion ends, the two insertion ends are respectively inserted into the 2i and 2i-1 layers of the stator slots, 1≤i≤n and i is a positive integer, the pitch between the two insertion ends of the flat wire coil is 7, 8, 10, or 11 stator slots; wherein m, n, p, q, and i are integers greater than or equal to 1.

[0008] Optionally, the stator slots are divided into 6 layers, the layer close to the outer wall of the stator core is the 6th layer, and the layer close to the inner wall of the stator core is the 1st layer; wherein,

[0009] In the 1st-2nd layers, the pitch between the two insertion ends of the flat wire coil inserted into the stator slots is 10 and 7; in the 3rd-4th layers, the pitch between the two insertion ends of the flat wire coil inserted into the stator slots is 11 and 8; in the 5th-6th layers, the pitch between the two insertion ends of the flat wire coil inserted into the stator slots is 10 and 7.

[0010] Optionally, each phase winding includes two parallel branches, the inflow point lead-out line of the first branch is located at the 6th layer, and the outflow point is located at the 1st layer. The first branch is wound from the 6th layer to the 1st layer, and then reversely wound from the 1st layer to the 6th layer, and then reversely wound from the 6th layer to the first layer; the inflow point lead-out line of the second branch is located at the 1st layer, and the outflow point is located at the 6th layer. The second branch is wound from the 1st layer to the 6th layer in reverse, from the 6th layer to the 1st layer, and then reversely wound from the 1st layer to the 6th layer.

[0011] Optionally, each phase winding includes three parallel branches, the inlet lead and outlet point of each branch are located at the 6th layer, and the flat wire winding is wound from the 6th layer to the 1st layer, and then reversely wound from the 1st layer to the 6th layer.

[0012] Optionally, the U-phase winding is offset along the circumferential direction of the stator core to obtain the V-phase winding and the W-phase winding.

[0013] Optionally, the flat wire coil is a U-shaped coil;

[0014] Optionally, the insertion end of the U-shaped coil extends out of the stator slot, the extended portion includes a bent portion bent in a direction away from the U-shaped coil, and the bent portions of the two U-shaped coils connected in series are welded.

[0015] Optionally, when the pitch between the two insertion ends of the flat wire coil is 7 and 10, the number of stator slots between two adjacent flat wire coils in the same parallel branch is 9; when the pitch between the two insertion ends of the flat wire coil is 8 and 11, the number of stator slots between two adjacent flat wire coils in the same parallel branch is 8.

[0016] Optionally, the three-phase windings are star-connected.

[0017] In a second aspect, an embodiment of the present application provides a motor, comprising the flat wire stator provided in the first aspect of the present application.

[0018] Compared with the prior art, this application has the following advantages:

[0019] The present application provides a flat wire stator, wherein the number of stator slots corresponding to each pole is 3, the pole pitch is fixed at 9, and the U-shaped coil is arranged across the two adjacent layers of the stator slots, with two arrangement methods: 10, 10, 7 and 11, 8, 11. Only two wire types are required per two layers to wind a variety of branch combinations, and the number of slots and layers of the stator slots and the number of parallel branches can be determined according to actual conditions. While maintaining a small number of wire types, the electrical balance of the motor, the balance of the number of winding layers, and the connection scheme of the flat wire winding that is universal for different voltage platforms are achieved. At the same time, the process processing and mold costs are lower, and the derived copper busbar structure is simpler, which can reduce the equipment investment ratio and improve the utilization rate of equipment and motors, thereby achieving the goal of comprehensive cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a cross-sectional view of a 54-slot, 6-pole motor according to an embodiment of the present utility model;

[0022] Figure 2 This is a 3D diagram of a 54-slot, 6-pole, 6-layer, 2-branch motor according to an embodiment of the present utility model;

[0023] Figure 3 This is a 3D diagram of a 54-slot, 6-pole, 6-layer, 3-branch motor according to an embodiment of the present utility model;

[0024] Figure 4 The flat wires of each layer are numbered from the slot to the bottom of the slot according to the embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of a 54-slot, 6-pole, 6-layer, 2-branch winding according to an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of a 54-slot, 6-pole, 6-layer, 3-branch winding according to an embodiment of the present utility model;

[0027] Figure 7 It is a 54-slot, 6-pole, 6-layer, 2-branch winding 3D digital model according to an embodiment of the present invention;

[0028] Figure 8 It is a 3D digital model of a 54-slot, 6-pole, 6-layer, 3-branch winding according to an embodiment of the present invention.

[0029] Reference numerals: 1: stator core; 2: flat wire winding; 3: stator slot; 4: flat wire coil; 5: outgoing copper bar; 6: neutral copper bar DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the fixed scope of the present invention.

[0031] It should be understood that references throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present invention. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout this specification do not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0032] In the description of this application, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0033] The present application provides a flat wire stator, including a stator core 1 and a flat wire winding 2; the inner wall of the stator core 1 is evenly provided with 18m stator slots 3 along the circumferential direction, the stator slots 3 are divided into 2n layers, and the flat wire winding 2 is wound in the stator slots 3; the flat wire winding 2 includes three-phase windings U, V, and W, each phase winding includes p parallel branches, each parallel branch includes q series-connected flat wire coils 4, q = 6mn / p, the flat wire coil 4 includes two insertion ends, the two insertion ends are respectively inserted into the 2i and 2i-1 layers of the stator slots 3, 1≤i≤n and i is a positive integer.

[0034] The flat wire coil 4 can have various line types, such as U-pin and I-pin. This application utilizes a U-shaped coil. The parallel branches of each phase winding are formed by sequentially connecting multiple U-shaped coils to reduce the number of line types and the complexity of coil processing. Each U-shaped coil has a crown end and two insertion ends. The stator core 1 has a shaping end and a welding end at each end. The U-shaped coil is inserted into the stator slot 3 from the shaping end of the stator core 1. The crown end of the U-shaped coil is clamped to the surface of the shaping end, while the insertion end extends from the welding end of the stator core 1. The extended portion is then welded.

[0035] Furthermore, the insertion end of the U-shaped coil extends out of the stator slot 3. The extended portion includes a bend that bends away from the U-shaped coil. In the same branch, the bends of two adjacent U-shaped coils are welded together, connecting the adjacent coils end to end to form a complete branch. The coils at the beginning and end of the branch are connected to the circuit. The current inflow end of each branch extends an inflow lead wire, which is connected to the outgoing copper busbar 5 of the corresponding phase. The current outflow end extends an outflow lead wire, connecting the outgoing ends of each branch of the U, V, and W three-phase windings to a neutral point via a neutral copper busbar 6. The outgoing copper busbar 5 and the neutral copper busbar 6 of each phase are both located at the welded end of the stator core 1.

[0036] The flat wire stator in this application occupies 3 stator slots 3 per phase and per pole, with a pole pitch of 9. The U-shaped coil is arranged across the 2i and 2i-1 layers of the stator slot 3. The pitch between the two insertion ends of the U-shaped coil is 7, 8, 10, and 11 stator slots 3. The number of slots and layers of the stator slot 3 and the number of parallel branches can be determined according to actual conditions.

[0037] Furthermore, the number of stator slots 3 spanned between the two inserted ends of the U-shaped coil is the pitch. Pitch refers to the number of slots spanned between the two sides of each coil element in the motor winding, also known as the span. The pitch value is expressed in slots. In this embodiment, the pitch of the U-shaped coils has two combinations: 10, 10, 7, and 11, 11, 8. Two different U-shaped coil types are used for every two layers, and 2n layers require a total of 2n different U-shaped coil types.

[0038] Specifically, the following describes in detail the method for winding the flat wire winding 2 of the flat wire stator in the present application by taking a 54-slot, 6-stage, 6-layer motor as an example.

[0039] Example 1

[0040] like Figure 2 As shown, the flat wire stator in this embodiment has 54 slots, 6 poles, 6 layers, and 2 branches. The inner wall of the stator core 1 is evenly circumferentially defined with 54 stator slots 3, divided into 6 layers for inserting the stator windings. Flat wire windings 2 are wound in these stator slots 3. These include three-phase windings (U, V, and W). Each phase winding has two parallel branches, with m = 3, n = 3, p = 2, and q = 27. Each parallel branch consists of 27 series-connected U-shaped coils. The U-shaped coils have two insertion ends, which are inserted into the 2i and 2i-1 layers of the stator slots 3, respectively, where 1 ≤ i ≤ 3 and i is a positive integer.

[0041] like Figure 4 As shown, the stator slots 3 are divided into 6 layers from the inside to the outside in the radial direction, and 6 rectangular conductors are inserted in each stator slot 3.

[0042] Each phase winding includes two parallel branches. The inflow point and lead-out line of the first branch are located on the 6th layer, and the outflow point is located on the 1st layer. The first branch is wound from the 6th layer to the 1st layer, commutates on the same layer in the 1st layer, and is wound in reverse from the 1st layer to the 6th layer. It is reversed again on the 6th layer and then wound from the 6th layer to the first layer. The current flows into the 6th layer and flows out from the 1st layer; the inflow point and lead-out line of the second branch are located on the 1st layer, and the outflow point is located on the 6th layer. The second branch is wound in reverse from the 1st layer to the 6th layer, commutates on the same layer in the 6th layer, and is wound from the 6th layer to the 1st layer. It is reversed again on the same layer in the 1st layer and ends with the 1st layer. The current flows into the 1st layer and flows out from the 6th layer.

[0043] In this embodiment, the coil in the first branch of each phase winding is wound along the outside-inside-outside direction, and the coil in the second branch is wound along the inside-outside-inside direction. The two insertion ends of the coil are respectively located in the stator slots 3 of adjacent layers. Then, the coils are transposed in the same layer through the innermost layer of the slot opening or the outermost layer of the slot bottom to eliminate the phase difference between different branches, ensuring that each branch is symmetrical in the slot and in the layer. That is, the parallel branches are distributed in a ring-shaped symmetrical structure in the stator slot 3, thereby achieving uniform and symmetrical distribution of the windings of each phase, so that the potential of each branch is balanced, there is no circulating current, and harmonics are offset, thereby greatly improving the performance of the motor.

[0044] Figure 5 This is a schematic diagram of a 54-slot, 6-pole, 6-layer, 2-branch winding according to an embodiment of the present invention. The solid lines in the diagram represent the flat wire coils 4 inserted into the stator slots 3, while the dashed lines represent the bends connecting two adjacent flat wire coils 4. The arrangement of the flat wire coils 4 within the stator slots 3 is described using the U-phase winding as an example.

[0045] The U1 branch flat wire is connected in sequence as follows: slot 54, layer 6, slot 10, layer 5, slot 19, layer 6, slot 29, layer 5, slot 38, layer 6, slot 45, layer 5, slot 54, layer 4, slot 11, layer 3, slot 19, layer 4, slot 30, layer 3, slot 38, layer 4, slot 46, layer 3, slot 1, layer 2, slot 11, layer 1, slot 20, layer 2, slot 30, layer 1, slot 39, layer 2, slot 46, layer 1, slot 1, layer 1, slot 48, layer 1, slot 39, layer 1, slot 29, layer 2, slot 20, layer 1, slot 10, layer 2, slot 1, layer 3, slot 47, layer 4 , slot 39, layer 3, slot 28, layer 4, slot 20, layer 3, slot 9, layer 4, slot 54, layer 5, slot 47, layer 6, slot 38, layer 5, slot 28, layer 6, slot 19, layer 5, slot 9, layer 6, slot 1, layer 6, slot 11, layer 5, slot 20, layer 6, slot 27, layer 5, slot 36, layer 6, slot 46, layer 5, slot 1, layer 4, slot 12, layer 3, slot 20, layer 4, slot 28, layer 3, slot 36, layer 4, slot 47, layer 3, slot 2, layer 2, slot 12, layer 1, slot 21, layer 2, slot 28, layer 1, slot 37, layer 2, slot 47, layer 1.

[0046] On the 5th and 6th layers, three U-shaped coils 54-10, 19-29, and 38-45 are arranged in sequence, and three U-shaped coils 54-47, 38-28, and 19-9 are arranged in reverse order. Then three U-shaped coils 1-11, 20-27, and 36-46 are arranged in sequence, with a pitch of 10, 10, and 7. The two adjacent U-shaped coils are separated by 9 stator slots 3, and two wire types are used in total.

[0047] On the 3rd and 4th layers, three U-shaped coils are arranged in sequence: 54-11, 19-39, and 38-46. Three U-shaped coils are arranged in reverse order: 1-47, 39-28, and 20-9. Then three U-shaped coils are arranged in sequence: 1-12, 20-28, and 36-47. The pitch is 11, 8, and 11. Two adjacent U-shaped coils are separated by 8 stator slots 3. Two types of wires are used in total.

[0048] On the 1-2 layer, three U-shaped coils are arranged in sequence: 1-11, 20-30, and 39-46. Three U-shaped coils are arranged in reverse order: 1-48, 39-29, and 20-10. Then three U-shaped coils are arranged in sequence: 2-12, 21-28, and 37-47. The pitch is 10, 10, and 7. Two adjacent U-shaped coils are separated by 9 stator slots 3. Two wire types are used in total.

[0049] The U1 branch uses six different U-shaped coil types. The U2 branch's winding order is reversed, following the same arrangement as the U1 branch, using the same six different coil types. The U1 and U2 branches are connected in parallel to form the U-phase winding. By offsetting the U-phase winding in stator slot 3 along the circumference of the stator core 1, the V-phase and W-phase windings are formed. The V-phase and W-phase windings use the same coil types as the U-phase winding.

[0050] It can be understood that by exchanging the order of the first and sixth layers of the stator slots 3 , the arrangement of the branches is still applicable, with the same line type, but the winding order is reversed.

[0051] This solution utilizes U-pin wire shapes throughout. The welding process for the wire exits is simple, requiring only six wire shapes when the stator slots are divided into six layers. This reduces processing and tooling costs, resulting in a simpler busbar structure, greater structural strength, and reduced insulation risks. The use of short-pitch windings reduces the height of the winding wire at the welding and crown ends, lowering material costs. This allows for flexible branch switching, increased production line flexibility, and enhanced platform compatibility, meeting the winding application requirements of both medium-voltage and high-voltage motor platforms.

[0052] In some other optional embodiments, the three-phase windings are star-connected, and the extended outflow points are connected to the neutral copper bar 6. This can suppress the third harmonic current and prevent the three-phase windings of the motor from generating third harmonic circulating current.

[0053] Example 2

[0054] like Figure 3 As shown, the flat wire stator in this embodiment has 54 slots, 6 poles, 6 layers, and 3 branches. Fifty-four stator slots 3 are evenly distributed along the circumference of the inner wall of the stator core 1. The stator slots 3 are divided into six layers for inserting the stator windings. Flat wire windings 2 are wound in these stator slots 3. These flat wire windings 2 include three-phase windings (U, V, and W). Each phase winding has three parallel branches, with m = 3, n = 3, p = 3, and q = 18. Each parallel branch consists of 18 series-connected U-shaped coils. The U-shaped coils have two insertion ends, which are inserted into the 2i and 2i-1 layers of the stator slots 3, respectively, where 1 ≤ i ≤ 3 and i is a positive integer.

[0055] like Figure 4 As shown, the stator slots 3 are divided into 6 layers from the inside to the outside in the radial direction, and 6 rectangular conductors are inserted in each stator slot 3.

[0056] Each phase winding consists of three parallel branches, all with the same winding scheme. The inlet and outlet points of each branch are located on the sixth layer. The flat wire winding 2 is wound from the sixth layer to the first layer, reverses direction on the same layer, and then winds in the opposite direction from the first layer to the sixth layer, ending with current flowing into and out of the sixth layer. The copper busbars connected to the lead wires of the flat wire winding 2 can be centrally located outside the welded ends of the stator core 1.

[0057] Figure 6 This is a schematic diagram of a 54-slot, 6-pole, 6-layer, 3-branch winding according to an embodiment of the present invention. The solid lines in the diagram represent the flat wire coils 4 inserted into the stator slots 3, while the dashed lines represent the bends connecting two adjacent flat wire coils 4. The arrangement of the flat wire coils 4 within the stator slots 3 is described using the U-phase winding as an example.

[0058] The U1 branch flat wire is connected in the following order: slot 54, layer 6, slot 10, layer 5, slot 19, layer 6, slot 29, layer 5, slot 38, layer 6, slot 45, layer 5, slot 54, layer 4, slot 11, layer 3, slot 19, layer 4, slot 30, layer 3, slot 38, layer 4, slot 46, layer 3, slot 1, layer 2, slot 11, layer 1, slot 20, layer 2, slot 30, layer 1, slot 39, layer 2 , slot 46, 1st layer, slot 1, 1st layer, slot 48, 2nd layer, slot 39, 1st layer, slot 29, 2nd layer, slot 20, 1st layer, slot 10, 2nd layer, slot 1, 3rd layer, slot 47, 4th layer, slot 39, 3rd layer, slot 28, 4th layer, slot 20, 3rd layer, slot 9, 4th layer, slot 54, 5th layer, slot 47, 5th layer, slot 38, 6th layer, slot 28, 5th layer, slot 19, 6th layer, slot 9.

[0059] On the 5th and 6th layers, three U-shaped coils 54-10, 19-29, and 38-45 are arranged in sequence, and three U-shaped coils 54-47, 38-28, and 19-9 are arranged in reverse order, with pitches of 10, 10, and 7. The two adjacent U-shaped coils are separated by 9 stator slots 3, and two wire types are used in total.

[0060] On the 3rd and 4th layers, three U-shaped coils 54-11, 19-39, and 38-46 are arranged in sequence, and three U-shaped coils 1-47, 39-28, and 20-9 are arranged in reverse order, with pitches of 11, 8, and 11. The two adjacent U-shaped coils are separated by 8 stator slots 3, and two wire types are used in total.

[0061] On the 1-2 layer, three U-shaped coils 21-11, 20-30, and 39-46 are arranged in sequence, and three U-shaped coils 1-48, 39-29, and 20-10 are arranged in reverse order, with pitches of 10, 10, and 7. The two adjacent U-shaped coils are separated by 9 stator slots 3, and two wire types are used in total.

[0062] The U2 and U3 branches are arranged in the same manner as the U1 branch. They are formed by shifting the U1 branch by one and two stator slots 3, respectively, along the circumference of the stator core 1. The U1, U2, and U3 branches are connected in parallel to form the U-phase winding. By shifting the U-phase winding within the stator slots 3 along the circumference of the stator core 1, the V-phase and W-phase windings are formed. The arrangement of the V-phase and W-phase windings is identical to the arrangement of the flat wire coils 4 described above for the U-phase winding. Each phase winding comprises three parallel branches, each containing 18 flat wire coils 4. Each phase winding comprises 54 flat wire coils 4, for a total of 162 flat wire coils 4 in the flat wire stator.

[0063] The two different parallel branch schemes in the above embodiment are consistent in all other line types except for the different bridge connections, and the line types are minimal, involving only six types of U-shaped coils, two in each layer, and the electrical and winding layer numbers are balanced. This scheme is versatile and can be applied to a variety of different models of motors with only a small number of line types to form different parallel branch schemes.

[0064] The number of stator slots corresponding to each pole of the flat wire stator in this application is 3, and the pole pitch is fixed at 9. Based on the 54-slot 6-pole 6-layer motor in the embodiment, the number of slots, poles, layers and branches can be expanded. For example, if it is expanded to a 72-slot 8-pole 6-layer motor, the flat wire winding method disclosed in this embodiment is still applicable, and only 6 types of U-shaped coils need to be used.

[0065] This embodiment also provides a flat wire motor including the aforementioned flat wire stator, which can be used in new energy vehicles. Compared to traditional motors using round wire windings, this motor can significantly increase the stator winding slot fill rate, save volume, and thus reduce the motor's copper loss, providing superior acceleration performance. While maintaining a relatively small number of wire types, it achieves motor electrical balance, balanced winding layers, and a universal flat wire winding connection solution for different voltage platforms. Simultaneously, it reduces processing and mold costs, and the derived busbar structure is simpler, which can reduce the equipment investment ratio and improve equipment and motor utilization, achieving the goal of comprehensive cost reduction.

[0066] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0067] Although alternative embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including alternative embodiments and all changes and modifications that fall within the scope of the present invention.

[0068] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity from another, and do not necessarily require or imply any actual relationship or order between these entities. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that an article or terminal device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the article or terminal device comprising the element.

[0069] The above is a detailed introduction to the technical solution provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. At the same time, for those skilled in the art, according to the principles and implementation methods of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A flat wire stator, characterized in that: The stator core comprises a stator core and a flat wire winding; the inner wall of the stator core is evenly provided with 18m stator slots along the circumferential direction, the stator slots are divided into 2n layers along the radial direction of the core, and the flat wire winding is wound in the stator slots; The flat wire winding includes three-phase windings U, V, and W, each phase winding includes p parallel branches, each parallel branch includes q series-connected flat wire coils, q=6mn / p, the flat wire coil includes two insertion ends, the two insertion ends are respectively inserted into the 2i and 2i-1 layers of the stator slots, 1≤i≤n and i is a positive integer, the pitch between the two insertion ends of the flat wire coil is 7, 8, 10, or 11 stator slots; wherein m, n, p, q, and i are integers greater than or equal to 1.

2. The flat wire stator according to claim 1, wherein: The stator slots are divided into 6 layers, the layer close to the outer wall of the stator core is the 6th layer, and the layer close to the inner wall of the stator core is the 1st layer; Among them, in the 1st and 2nd layers, the pitch between the two insertion ends of the flat wire coil inserted into the stator slots is 10 and 7; in the 3rd and 4th layers, the pitch between the two insertion ends of the flat wire coil inserted into the stator slots is 11 and 8; in the 5th and 6th layers, the pitch between the two insertion ends of the flat wire coil inserted into the stator slots is 10 and 7.

3. The flat wire stator according to claim 2, wherein: Each phase winding includes two parallel branches. The inflow point lead-out line of the first branch is located on the 6th layer, and the outflow point lead-out line is located on the 1st layer. The first branch is wound from the 6th layer to the 1st layer, and then reversely wound from the 1st layer to the 6th layer, and then wound from the 6th layer to the 1st layer. The inflow point lead-out line of the second branch is located on the 1st floor, and the outflow point lead-out line is located on the 6th floor. The second branch goes in reverse from the 1st floor to the 6th floor, from the 6th floor to the 1st floor, and then goes in reverse from the 1st floor to the 6th floor.

4. The flat wire stator according to claim 2, wherein: Each phase winding includes three parallel branches, the inlet lead and outlet of each branch are located at the 6th layer, and the flat wire winding is wound from the 6th layer to the 1st layer, and then reversely wound from the 1st layer to the 6th layer.

5. The flat wire stator according to claim 1, wherein: The U-phase winding is offset along the circumferential direction of the stator core to obtain the V-phase winding and the W-phase winding.

6. The flat wire stator according to claim 1, wherein: The flat wire coil is a U-shaped coil.

7. The flat wire stator according to claim 6, wherein: The insertion end of the U-shaped coil extends out of the stator slot, and the extended portion includes a bent portion bent in a direction away from the U-shaped coil. The bent portions of the two U-shaped coils connected in series are welded.

8. The flat wire stator according to claim 1, wherein: When the pitch between the two insertion ends of the flat wire coil is 7 and 10, the number of stator slots between two adjacent flat wire coils in the same parallel branch is 9; when the pitch between the two insertion ends of the flat wire coil is 8 and 11, the number of stator slots between two adjacent flat wire coils in the same parallel branch is 8.

9. The flat wire stator according to claim 1, wherein: The three-phase windings are star-connected.

10. A flat wire motor, characterized in that: The invention comprises the flat wire stator according to any one of claims 1 to 9.

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