Flat wire motor and its stator, vehicle

Abstract

The present application relates to a flat wire motor, its stator, and a vehicle. The stator includes a stator core and a stator winding. A plurality of wire grooves are circumferentially formed on the inner wall of the stator core at intervals in sequence, and any one of the wire grooves extends along the axial direction of the stator core. The stator winding is disposed on the stator core. The stator winding includes a plurality of combined structures, and the number of combined structures is the same as the number of wire grooves. Each combined structure is sequentially inserted into each wire groove along the circumferential direction of the stator core. Compared with the method of inserting a plurality of single coils into different wire grooves respectively in the related art, by adopting the method of inserting a plurality of combined structures into different wire grooves respectively, when the total number of coils is the same, the insertion times can be reduced by half, making the insertion process simple and improving the production efficiency. At the same time, the two coils of the combined structure can adopt the same wire type and be put into production, that is, the types of wire types of the coils can be reduced, thereby correspondingly reducing the cost of the forming die.

Description

Technical Field

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

[0002] With the promotion of national environmental protection policies and the increasing maturity of new energy technologies, new energy vehicles are becoming more and more popular, and their market share is getting larger and larger. As one of the core components of new energy vehicles, the motor directly provides power guarantee for the vehicle, and innovations in technologies, processes, etc. have attracted much attention. The motors of new energy vehicles mainly include a stator and a rotor. The stator is the fixed part of the motor and is usually composed of an iron core and windings. The iron core is laminated by silicon steel sheets and is used for magnetic conduction and supporting the windings. The windings are wound by wires and generate a magnetic field through energization. The rotor is the rotating part of the motor and is usually composed of a permanent magnet or an electromagnet core and windings.

[0003] In related art new energy vehicles, in order to improve performance, flat wire winding motors are mostly used. Flat wire motors mostly use Hair-pin (hairpin coil) winding, that is, the formed coil is inserted into the stator slot, and then twisted and formed and welded at the lead-out end. Under this winding process, although the coil wire type, wire insertion method, flaring, twisting, and welding method each have their own characteristics, they all have a common point: single wire coil forming and single wire coil insertion. This forming and insertion method is easy to implement and is relatively popular. However, there are many types of coil wire types and many wire insertion times. The large number of coil wire types will result in the investment of more wire forming molds due to wire forming requirements, which will increase the production cost to a certain extent, and the production efficiency is low due to the replacement of forming molds during production. In addition, more coil wire insertions will increase the wire insertion process time, resulting in a long wire insertion process time and low production efficiency to a certain extent. Summary of the Invention

[0004] Based on this, it is necessary to overcome the defects of the prior art and provide a flat wire motor and its stator and vehicle, which can reduce the production cost and improve the production efficiency.

[0005] A stator of a flat wire motor, the stator of the flat wire motor includes:

[0006] A stator core, a plurality of winding slots are circumferentially arranged at intervals on the inner wall of the stator core, and any one of the winding slots extends along the axial direction of the stator core; and

[0007] The stator winding is disposed on the stator core. The stator winding includes a plurality of combined structures, the number of the combined structures being the same as the number of the winding slots. Each of the combined structures is sequentially inserted into each of the winding slots along the circumferential direction of the stator core. Each combined structure includes two coils that are stacked and connected and insulated from each other. The coils of all the combined structures are combined and connected to form at least one branch, and the branch includes a plurality of the coils connected in series.

[0008] In one embodiment, the coil includes a main body and a bent portion; the main body includes two insertion portions arranged side by side at intervals and a connecting portion connected to one ends of the two insertion portions; the two insertion portions of the main body are respectively inserted into two different winding slots; the bent portion is located at the other ends of the two insertion portions and forms a welding end; the two main bodies of each combined structure are stacked and connected and insulated from each other.

[0009] In one embodiment, the two main bodies of each combined structure are adhesively connected or integrally injection molded through an insulating material.

[0010] In one embodiment, the shapes and sizes of the main bodies of the same stator winding are kept consistent.

[0011] In one embodiment, the stator winding is a three-phase winding, and each phase winding includes two branches arranged in parallel; each branch includes a plurality of units arranged in a periodic manner in sequence along the inner wall of the stator core, and each unit includes two coils connected in series; the two coils of each combined structure are respectively a first coil and a second coil; the two coils of one unit are respectively selected from the first coil of one of the combined structures and the second coil of another combined structure.

[0012] In one embodiment, the first coil includes a first bent portion, a first insertion portion, a first connecting portion, a second insertion portion, and a second bent portion connected in sequence. A first welding end is provided at one end of the first bent portion away from the first insertion portion, and a second welding end is provided at one end of the second bent portion away from the second insertion portion. The first bent portion and the second bent portion are bent in directions away from each other;

[0013] The second coil includes a third bent portion, a third insertion portion, a second connecting portion, a fourth insertion portion, and a fourth bent portion connected in sequence. A third welding end is provided at one end of the third bent portion away from the third insertion portion, and a fourth welding end is provided at one end of the fourth bent portion away from the fourth insertion portion. The third bent portion and the fourth bent portion are bent in directions close to each other;

[0014] For the same unit, the second plugging part and the third plugging part are both plugged into the same wire winding groove. Along the direction from the groove bottom to the groove opening of the wire winding groove, the first welding end is located on the first layer, the second welding end is located on the third layer, the second welding end is connected to the fourth welding end, the fourth welding end is located on the fourth layer, and the third welding end is located on the second layer; the third welding end is connected to the first welding end of another adjacent unit.

[0015] In one embodiment, for the same unit, the second bending part and the third bending part have the same shape and are stacked together.

[0016] In one embodiment, the stator winding is provided with at least two, and is arranged on the stator core in sequence along the radial direction of the stator core.

[0017] In one embodiment, the stator winding is provided with two, namely an outer ring winding and an inner ring winding respectively. The inner ring winding is closer to the central axis of the stator core; the bending degree of the connecting part of the outer ring winding in the direction away from the central axis of the stator core is greater than that of the connecting part of the inner ring winding in the direction away from the central axis of the stator core.

[0018] A flat wire motor, the flat wire motor includes the stator of the flat wire motor described above.

[0019] A vehicle, the vehicle includes the flat wire motor described above.

[0020] The above-mentioned flat wire motor, its stator and vehicle, compared with the method of inserting multiple single coils into different wire winding grooves respectively in the related art, adopt the method of inserting multiple combined structures into different wire winding grooves. When the total number of coils is the same, the insertion times can be reduced by half, making the insertion process simple and the production efficiency improved; at the same time, the two coils of the combined structure can adopt the same wire type and be put into production, that is, the types of wire types of the coils can be reduced, so that the cost of the forming die can be reduced accordingly. Description of the Drawings

[0021] Figure 1 It is a structural diagram of the stator of the flat wire motor according to an embodiment of the present application.

[0022] Figure 2 It is Figure 1 A structural diagram of a stator winding in the shown structure.

[0023] Figure 3 It is Figure 1 A structural diagram of the stator core in the shown structure.

[0024] Figure 4 is Figure 3 The enlarged structural diagram at A.

[0025] Figure 5 The structural diagram of the combined structure of an embodiment of the present application.

[0026] Figure 6 is Figure 5 The exploded structural diagram of the shown structure.

[0027] Figure 7 The structural diagram of the unit of an embodiment of the present application.

[0028] Figure 8 is Figure 7 The structural diagram of the shown structure inserted onto the stator core.

[0029] Figure 9 The exploded structural diagram of the combined structure of another embodiment of the present application.

[0030] Figure 10 The structural diagram of the unit of another embodiment of the present application.

[0031] Figure 11 is Figure 10 The structural diagram of the shown structure inserted onto the stator core.

[0032] 10. Stator core; 11. Winding slot; 20. Stator winding; 21. Combined structure; 211. Coil; 2111. Insertion part; 2112. Connection part; 2113. Bending part; 2114. First split section; 2115. Second split section; 2116. Third split section; 212. First coil; 2121. First bending part; 2122. First insertion part; 2123. First connection part; 2124. Second insertion part; 2125. Second bending part; 2126. First welding end; 2127. Second welding end; 213. Second coil; 2131. Third bending part; 2132. Third insertion part; 2133. Second connection part; 2134. Fourth insertion part; 2135. Fourth bending part; 2136. Third welding end; 2137. Fourth welding end; 22. Unit. Detailed implementation manners

[0033] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0034] At present, in the drive motors of new energy vehicles, the stator can be divided into round wire conductors and flat copper wire conductors according to the cross-sectional shape of the coils forming the windings. The motor using flat copper wire conductors is called a flat wire motor. The flat wire motor can effectively increase the slot fill factor, power density, and torque density. However, as the number of flat wire conductors in the winding slot gradually increases, the number and types of coils also increase. Different types of wire insertion molds are required for wire insertion during the automated insertion process of the coils. Moreover, when inserting the coils, there are usually various situations where coils of different types cross-insert at the insertion end of the winding. The complex insertion method of the coils is not conducive to realizing automated insertion. At the same time, when increasing the number of layers of flat wire conductors in the winding slot, the coil winding method becomes more complex, and a more complex automated wire insertion program needs to be designed. As a result, the production cost increases and the production efficiency decreases.

[0035] For easy understanding, the following first explains the professional terms appearing in this application as follows.

[0036] Stator: It refers to the stationary part in the motor, and its function is to generate a rotating magnetic field.

[0037] Rotor: It refers to the rotating part in the motor, and its function is to realize the conversion between electrical energy and mechanical energy.

[0038] Span: Also known as the first pitch, it refers to the distance that the two element sides of the same element in the motor winding span on the armature surface, usually represented by the number of winding slots opened on the stator core.

[0039] Refer to Figures 1 to 8 , Figure 1 shows the structural diagram of the stator of the flat wire motor according to an embodiment of the present application. Figure 2 shows Figure 1 the structural diagram of a stator winding 20 in the shown structure. Figure 3 shows Figure 1 the structural diagram of the stator core 10 in the shown structure. Figure 4 shows Figure 3 the enlarged structural diagram at A. Figure 5 shows the structural diagram of a combined structure 21 according to an embodiment of the present application. Figure 6 shows Figure 5 the exploded structural diagram of the shown structure. Figure 7 shows the structural diagram of a unit 22 according to an embodiment of the present application. Figure 8 shows Figure 7The structural diagram of inserting the shown structure onto the stator core 10. A stator of a flat wire motor provided by an embodiment of the present application, the stator of the flat wire motor includes: a stator core 10 and a stator winding 20. A plurality of winding grooves 11 arranged at intervals in sequence are circumferentially provided on the inner wall of the stator core 10 along the Z direction, and any one of the winding grooves 11 extends along the axial direction O of the stator core 10. The stator winding 20 is arranged on the stator core 10, and the stator winding 20 includes a plurality of combined structures 21. The number of the combined structures 21 is the same as the number of the winding grooves 11, and each of the combined structures 21 is sequentially inserted into each of the winding grooves 11 along the circumferential direction Z of the stator core 10. Each combined structure 21 includes two coils 211 that are stacked and connected and insulated from each other, and the coils 211 of all the combined structures 21 are combined and connected to form at least one branch, and the branch includes a plurality of coils 211 connected in series.

[0040] Among them, the number of the winding grooves 11 can be represented by m, and m is a natural number that is a multiple of 3, for example, 54, 72, etc. The specific value can be selected according to the design of the motor. Specifically, all the winding grooves 11 are uniformly arranged along the circumferential direction Z of the inner wall of the stator core 10. The stator core 10 is divided into an insertion end and a protruding end along its axial direction O, and any one of the winding grooves 11 can extend from the insertion end to the protruding end.

[0041] For the stator of the flat wire motor described above, compared with the method of inserting a plurality of single coils 211 into different winding grooves 11 respectively in the related art, by adopting the method of inserting a plurality of combined structures 21 into different winding grooves 11 respectively, when the total number of the coils 211 is the same, the insertion times can be reduced by half, making the insertion process simple and improving the production efficiency; at the same time, the two coils 211 of the combined structure 21 can adopt the same wire type and be put into production, that is, the types of the wire types of the coils 211 can be reduced, so that the cost of the forming dies can be correspondingly reduced.

[0042] In some embodiments, the coil 211 includes, but is not limited to, a hairpin coil.

[0043] Please refer to Figure 5 and Figure 6 , in one embodiment, the coil 211 includes a main body and a bent portion 2113. The main body includes two plug-in portions 2111 arranged side by side at intervals and a connecting portion 2112 connected to one end of the two plug-in portions 2111. Among them, the connecting portion 2112 includes, but is not limited to, a V shape or an arc shape, so that the main body is in a U shape or a V shape. Since each coil 211 adopts the same type (U shape or V shape), the special-shaped coils and the cross-connected coils are cancelled, the types of the coils 211 are reduced, which is convenient for assembly and mass production, and improves the production efficiency.

[0044] In addition, the two plug-in parts 2111 of the main body are respectively inserted into two different wire winding grooves 11. The bending part 2113 is located at the other ends of the two plug-in parts 2111 and forms a welding end. Optionally, the plug-in part 2111 includes, but is not limited to, being arranged as a flat wire conductor. That is, the cross-section in its extending direction is, for example, rectangular.

[0045] In addition, the two main bodies of each combined structure 21 are stacked and connected and are insulated from each other.

[0046] In some embodiments, the bending part 2113 is specifically formed by bending the plug-in part 2111 after the plug-in part 2111 is inserted. Among them, the two bending parts 2113 of each main body can either bend away from each other, or bend towards each other, or bend in other ways, which is not limited here.

[0047] In addition, along the axis direction O of the stator core 10, the stator winding 20 is divided into a wire insertion end and a connection end. Any coil 211 is inserted into the wire winding groove 11 from the wire insertion end and extends out from the connection end. Specifically, the connection part 2112 is located at the wire insertion end, and the bending part 2113 is located at the connection end. Thus, at the connection end, the bending parts 2113 of different coils 211 can be welded and connected, and the combined connection of different coils 211 can be realized and at least one branch circuit can be formed.

[0048] In one embodiment, the two main bodies of each combined structure 21 include, but are not limited to, being adhesively connected or integrally injection molded through an insulating material. In this way, for each combined structure 21, the two main bodies are connected and fixed by means of adhesive connection, or connected and fixed by means of integral injection molding through an insulating material.

[0049] In one embodiment, the shapes and sizes of the main bodies of the same stator winding 20 are kept consistent. In this way, the forming angles are the same, which can improve the production efficiency and greatly reduce the high-cost investment such as the forming die caused by multiple forming of multiple coils 211.

[0050] Optionally, in the actual production process of the combined structure 21, on the one hand, a semi-finished product can be processed by means of a forming die, and then the semi-finished product is subjected to segmented cutting and bending treatment to obtain the combined structure 21, and the production efficiency is relatively high; on the other hand, the combined structure 21 can also be directly formed by means of a forming die. Compared with the single coil 211 formed in the related art, the production efficiency is improved.

[0051] Please refer to Figures 5 to 8, in one embodiment, the stator winding 20 is specifically, for example, a three-phase winding, and each phase winding includes two branches arranged in parallel. That is, the total number of branches of each stator winding 20 is 3 * 2 = 6. Specifically, each branch includes a plurality of units 22 arranged in a periodic manner in sequence along the inner wall of the stator core 10. All the units 22 are connected in series along the arrangement direction. Specifically, each unit 22 includes two coils 211 connected in series. The coils 211 of each unit 22 are different from each other, that is, the number of coils 211 can determine the number of units 22. The number of coils 211 in this embodiment can be obtained through the number m of winding slots 11, and the number of coils 211 is 2m. Specifically, taking the number of winding slots 11 as 72 as an example, the number of coils 211 is, for example, 72 * 2 = 144, and the number of units 22 is correspondingly 144 / 2 = 72. In addition, the number of units 22 in each branch is, for example, 72 / 6 = 12. Of course, when the number m of winding slots 11 changes, the number of coils 211, the number of units 22, and the number of units 22 in the branch will all be adjusted accordingly.

[0052] Among them, the two coils 211 of each combined structure 21 are respectively a first coil 212 and a second coil 213. The two coils 211 of a unit 22 are respectively selected from the first coil 212 of one combined structure 21 and the second coil 213 of another combined structure 21. In this way, by reasonably selecting the coils 211 to be connected in series to form a branch, the structural arrangement of the winding can be made compact, so as to reduce the overall volume size of the stator winding 20, and thus it can be arranged on the stator core 10 with a small volume size, and the material cost can be reduced.

[0053] In a specific embodiment, the first coil 212 includes a first bending portion 2121, a first insertion portion 2122, a first connection portion 2123, a second insertion portion 2124, and a second bending portion 2125 connected in sequence. A first welding end 2126 is provided at one end of the first bending portion 2121 away from the first insertion portion 2122, a second welding end 2127 is provided at one end of the second bending portion 2125 away from the second insertion portion 2124, and the first bending portion 2121 and the second bending portion 2125 are bent in directions away from each other.

[0054] In addition, the second coil 213 includes a third bent portion 2131, a third insertion portion 2132, a second connection portion 2133, a fourth insertion portion 2134, and a fourth bent portion 2135 that are connected in sequence. A third welding end 2136 is provided at one end of the third bent portion 2131 away from the third insertion portion 2132, and a fourth welding end 2137 is provided at one end of the fourth bent portion 2135 away from the fourth insertion portion 2134. The third bent portion 2131 and the fourth bent portion 2135 are bent toward each other. Specifically, the third welding end 2136 and the fourth welding end 2137 are arranged along the axis O of the stator core 10.

[0055] For the same unit 22, both the second insertion portion 2124 and the third insertion portion 2132 are inserted into the same winding slot 11. Along the direction from the bottom to the opening of the winding slot 11, the first welding end 2126 is located in the first layer, the second welding end 2127 is located in the third layer, the second welding end 2127 is connected to the fourth welding end 2137, the fourth welding end 2137 is located in the fourth layer, and the third welding end 2136 is located in the second layer. Specifically, the third welding end 2136 is connected to the first welding end 2126 of another adjacent unit 22.

[0056] In some embodiments, the cross-sections of the first welding end 2126, the second welding end 2127, the third welding end 2136, and the fourth welding end 2137 along their respective extension directions include, but are not limited to, rectangles. In other words, the first welding end 2126, the second welding end 2127, the third welding end 2136, and the fourth welding end 2137 are arranged as flat wire conductors. In this way, it is convenient to weld and connect to each other, and the connection stability is good. Optionally, the shapes and sizes of the first welding end 2126, the second welding end 2127, the third welding end 2136, and the fourth welding end 2137 are the same.

[0057] Please refer to Figures 5 to 8 , in one embodiment, for the same unit 22, the second bent portion 2125 and the third bent portion 2131 have the same shape and are stacked together. In this way, the arrangement can be made more compact and the volume size can be reduced.

[0058] In one embodiment, for two adjacent units 22, the fourth insertion portion 2134 of one unit 22 and the first insertion portion 2122 of the other unit 22 are respectively inserted into two adjacent winding slots 11. In this way, the arrangement is made more compact and the volume size is reduced.

[0059] In one embodiment of the present application, N layers of flat wire conductors can be provided in any winding slot 11, where N is a multiple of 2. For example, N can be 4, 6, 8, 10, 12, 14, or an even number greater than 14. As Figure 4As shown, when N is 8, each winding slot 11 is provided with 8 layers of flat wire conductors. It can be understood that Figure 4 the number of layers of the flat wire conductors shown is only for illustrative purposes. In addition to setting 8 layers of flat wire conductors, other even numbers of layers of flat wire conductors can also be set. The number of layers of the flat wire conductors in each winding slot 11 is not specifically limited herein.

[0060] When each winding slot 11 is provided with N layers of flat wire conductors, from the bottom of any winding slot 11 to the slot opening, the N layers of flat wire conductors are denoted as layer L1, layer L2, ……, layer LN-1, and layer LN. Among them, in the radial D direction of the stator core 10, the slot opening of the winding slot 11 is arranged close to the axis of the stator core 10, and the bottom of the winding slot 11 is arranged away from the axis of the stator core 10.

[0061] In some embodiments, the stator windings 20 in this embodiment include but are not limited to being set to at least two, and are arranged on the stator core 10 in sequence along the radial D of the stator core 10. It can be understood that the more the number of stator windings 20, the more the number of layers of the flat wire conductors in each winding slot 11. Specifically, when the number of stator windings 20 is set to 1 for example, the number of layers of the flat wire conductors in each winding slot 11 is correspondingly 4 for example; when the number of stator windings 20 is set to 2 for example, the two stator windings 20 are respectively an outer ring winding and an inner ring winding, and the inner ring winding is closer to the center of the stator core 10. The outer ring winding is specifically for example Figure 1 、 Figures 4 to 8 As shown, the inner ring winding is specifically for example Figure 1 、 Figures 9 to 11 As shown, the number of layers of the flat wire conductors in each winding slot 11 is correspondingly 8 for example. As Figure 4 shown, they are respectively denoted as layer L1, layer L2, ……, layer L8.

[0062] Please refer to Figures 6 to 8 and Figures 9 to 11 for comparison. In some embodiments, the bending degree of the connecting portion 2112 of the outer ring winding in the direction away from the central axis O of the stator core 10 is greater than that of the connecting portion 2112 of the inner ring winding in the direction away from the central axis O of the stator core 10. Specifically, for example, during the process of assembling the outer ring winding to the stator core 10, the connecting portion 2112 of the outer ring winding is bent synchronously in the direction away from the central axis O of the stator core 10, so as to provide a relatively larger space for the installation of the inner ring winding on the stator core 10, enabling the inner ring winding to be smoothly assembled to the stator core 10, avoiding the interference between the connecting portion 2112 of the inner ring winding and the connecting portion 2112 of the outer ring winding, and making the overall structure layout of the stator more compact and reducing the volume size.

[0063] Please refer to Figures 6 to 8 and Figures 9 to 11, in some embodiments, the connection portion 2112 of the outer ring winding includes two first split segments 2114 that are connected to each other and arranged at an angle. The angle between the two first split segments 2114 is, for example, any value between 30° and 150°. In addition, the connection portion 2112 of the inner ring winding also, for example, includes two second split segments 2115 that are connected to each other and arranged at an angle. Specifically, at least one second split segment 2115 includes two third split segments 2116 that are connected to each other and arranged at an angle or is arranged in an arc shape. Thus, by bending the connection portion 2112 of the inner ring winding, it is possible to avoid interference between the connection portion 2112 of the inner ring winding and the connection portion 2112 of the outer ring winding, making the overall structure layout of the stator more compact and reducing the volume size.

[0064] In one embodiment, a flat wire motor includes the stator of the flat wire motor in any of the above embodiments.

[0065] For the above flat wire motor, compared with the related art method of inserting multiple single coils 211 into different winding slots 11 respectively, by using the method of inserting multiple combined structures 21 into different winding slots 11, when the total number of coils 211 is the same, the insertion times can be reduced by half, making the insertion process simple and improving the production efficiency; at the same time, the two coils 211 of the combined structure 21 can adopt the same wire type for production, that is, the types of wire types of the coils 211 can be reduced, thereby correspondingly reducing the cost of the forming die.

[0066] In one embodiment, a vehicle includes the flat wire motor in any of the above embodiments.

[0067] For the above vehicle, compared with the related art method of inserting multiple single coils 211 into different winding slots 11 respectively, by using the method of inserting multiple combined structures 21 into different winding slots 11, when the total number of coils 211 is the same, the insertion times can be reduced by half, making the insertion process simple and improving the production efficiency; at the same time, the two coils 211 of the combined structure 21 can adopt the same wire type for production, that is, the types of wire types of the coils 211 can be reduced, thereby correspondingly reducing the cost of the forming die.

[0068] It should be noted that the "bending portion 2113" in this embodiment can be "a part of the main body", that is, the "bending portion 2113" and the "other parts of the main body" are integrally formed; or it can be an independent component separable from the "other parts of the main body", that is, the "bending portion 2113" can be independently manufactured and then combined with the "other parts of the main body" to form a whole.

[0069] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application.

[0070] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0071] In the present application, unless otherwise clearly specified and limited, if there are terms such as "mounted", "connected", "connected to", "fixed", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0072] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be 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, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0073] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0074] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0075] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A stator of a flat wire motor, characterized in that: The stator of the flat wire motor comprises: A stator core, wherein a plurality of winding slots arranged in sequence and at intervals are formed in the circumferential direction of the inner wall of the stator core, and any of the winding slots extends along the axial direction of the stator core; and A stator winding, wherein the stator winding is arranged on the stator core, and the stator winding includes a plurality of combined structures, the number of the combined structures is the same as the number of the winding slots, and each of the combined structures is sequentially inserted into each of the winding slots along the circumferential direction of the stator core, and each of the combined structures includes two coils that are stacked and connected and insulated from each other, and the coils of all the combined structures are combined and connected to form at least one branch, and the branch includes a plurality of coils connected in series; wherein the coil includes a main body and a bending portion; the main body includes two plug-in portions arranged in parallel and spaced relation and a connecting portion connected to one end of the two plug-in portions; the two plug-in portions of the main body are respectively inserted into two different winding slots; the bending portion is located at the other end of the two plug-in portions and forms a welding end; the two main bodies of each combined structure are stacked and connected and insulated from each other; the two main bodies of each combined structure are bonded or integrally injection molded by insulating materials; the shapes and sizes of the various main bodies of the same stator winding are consistent.

2. The stator of the flat wire motor according to claim 1, characterized in that: The coil is a hairpin coil.

3. The stator of the flat wire motor according to claim 1, characterized in that: The connecting portion is V-shaped or arc-shaped.

4. The stator of the flat wire motor according to claim 1, characterized in that: The plug-in portion is configured as a flat wire conductor.

5. The stator of the flat wire motor according to claim 1, characterized in that: The stator winding is configured as a three-phase winding, each phase winding comprising two branches arranged in parallel; each branch comprises a plurality of units arranged in a periodic manner in sequence along the inner wall of the stator core, each unit comprising two coils connected in series; the two coils of each combination structure are respectively a first coil and a second coil; the two coils of a unit are respectively selected from the first coil of one of the combination structures and the second coil of another combination structure.

6. The stator of the flat wire motor according to claim 5, characterized in that: The first coil comprises a first bending portion, a first plug portion, a first connecting portion, a second plug portion and a second bending portion connected in sequence, the first bending portion is provided with a first welding end at one end away from the first plug portion, the second bending portion is provided with a second welding end at one end away from the second plug portion, and the first bending portion and the second bending portion are bent in a direction away from each other; The second coil comprises a third bending portion, a third plug-in portion, a second connecting portion, a fourth plug-in portion and a fourth bending portion connected in sequence, the third bending portion is provided with a third welding end at one end away from the third plug-in portion, the fourth bending portion is provided with a fourth welding end at one end away from the fourth plug-in portion, and the third bending portion and the fourth bending portion are bent in a direction close to each other; For the same unit, the second plug-in part and the third plug-in part are both inserted into the same winding groove, and along the direction from the bottom of the winding groove to the groove mouth, the first welding end is located on the first layer, the second welding end is located on the third layer, the second welding end is connected to the fourth welding end, the fourth welding end is located on the fourth layer, and the third welding end is located on the second layer; the third welding end is connected to the first welding end of another adjacent unit.

7. The stator of the flat wire motor according to claim 6, characterized in that: For the same unit, the second bending portion and the third bending portion have the same shape and are stacked together.

8. The stator of the flat wire motor according to claim 1, characterized in that: The number of the stator windings is at least two and they are arranged on the stator core in sequence along the radial direction of the stator core.

9. The stator of the flat wire motor according to claim 8, characterized in that: The stator winding is set to two and respectively include an outer ring winding and an inner ring winding, the inner ring winding is closer to the central axis of the stator core; the degree of bending of the connecting portion of the outer ring winding in the direction away from the central axis of the stator core is greater than the degree of bending of the connecting portion of the inner ring winding in the direction away from the central axis of the stator core.

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

11. A vehicle, characterized in that: The vehicle includes the flat wire motor according to claim 10 .

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