Short-distance flat wire winding stator and motor

Abstract

The invention discloses a short-distance flat wire winding stator and a motor, the short-distance flat wire winding stator comprises a stator winding and a stator core, and the stator core comprises a plurality of stator slots arranged at intervals along the circumferential direction; the stator winding comprises a plurality of phases of winding loops, each phase of winding loop comprises a plurality of parallel winding branches, each winding branch comprises a plurality of winding modules wound in different stator slots, and each winding module comprises a plurality of winding coil structures and a connecting coil structure which are connected. The plurality of winding coil structures in each winding module are wound in two stator slots arranged at intervals to form a spiral structure, and each winding module and the adjacent winding module are connected in a spanning manner through a connecting coil structure. According to the short-distance flat wire winding stator and the motor, the types of wire types can be reduced, so that the assembly difficulty and the manufacturing cost are reduced.

Description

Technical Field

[0001] This application belongs to the field of motor technology, and in particular relates to a short-pitch flat wire winding stator and motor. Background Technology

[0002] With the development of the automotive industry, the requirements for automotive motors have also increased. In order to balance the performance requirements of high power density, high efficiency, low torque ripple and low noise, stators with flat wire windings and short spans are usually used.

[0003] Currently, the connection method for flat wire windings is usually to use a waveform coil structure for winding connection. However, under the condition of short-pitch winding, various waveform coil structures with different wire types are required for connection, resulting in a complex wire type situation. This not only increases the assembly difficulty of the winding, but also increases the manufacturing cost of the winding. Summary of the Invention

[0004] This application provides a short-pitch flat wire winding stator and motor, which can reduce the types of wires, thereby reducing assembly difficulty and manufacturing costs.

[0005] This application provides a short-pitch flat wire winding stator, which includes a stator winding and a stator core. The stator core includes a plurality of stator slots spaced apart circumferentially. The stator winding includes a multi-phase winding circuit, each phase winding circuit including a plurality of parallel winding branches, each winding branch including a plurality of winding modules wound in different stator slots, each winding module including a plurality of connected winding coil structures and a connecting coil structure. The plurality of winding coil structures in each winding module are wound into a helical structure in two spaced stator slots, and each winding module is connected to an adjacent winding module through a connecting coil structure.

[0006] The short-pitch flat wire winding stator described above includes a stator slot comprising 2N layers of receiving layers stacked radially. The multiple connecting coil structure includes multiple first connecting coils and multiple second connecting coils. The first connecting coils span across the first receiving layer of two stator slots, and the second connecting coils span across the 2N receiving layer of two stator slots. Each winding module is connected to its adjacent winding modules on both sides through the first connecting coils and the second connecting coils, respectively.

[0007] In the short-pitch flat wire winding stator shown above, the span of multiple winding coil structures is Y, the span of multiple first connecting coils is Y+1, and the multiple second connecting coils include two types of second connecting coils with spans of Y and Y+2, respectively.

[0008] The short-pitch flat wire winding stator shown above has two parallel winding branches in each phase winding circuit, and multiple second connecting coils are arranged alternately in the circumferential direction with spans of Y+2 and Y.

[0009] The short-pitch flat wire winding stator shown above has three parallel winding branches in each phase winding circuit, and multiple second connecting coils are arranged alternately along the circumference with spans of Y+2, Y, and Y.

[0010] In the short-pitch flat wire winding stator as described above, each winding coil structure includes two first conductor sides, a first bridging portion and two first welding portions. The first bridging portion is connected between the first ends of the two first conductor sides, and the two first welding portions are respectively connected to the second ends of the two first conductor sides, and both first welding portions extend toward the opposite first conductor side.

[0011] In the short-pitch flat wire winding stator as described above, each connecting coil structure includes two second conductor sides, a second bridging portion, and two second welding portions. The second bridging portion is connected between the first ends of the two second conductor sides, and the two second welding portions are respectively connected to the second ends of the two second conductor sides, and the two second welding portions extend in the same direction.

[0012] The short-pitch flat wire winding stator described above has a crown end and a welding end on both sides of the stator winding along the axial direction. Each winding branch also includes a lead terminal. The lead terminal is located at the crown end and is connected to the winding module located in the first receiving layer or the second receiving layer; or, the lead terminal is located at the welding end and is connected to the winding module located in the first and second receiving layers or the second-N-1 and second-N receiving layers.

[0013] The short-pitch flat wire winding stator described above includes a stator winding that further includes a connecting bar assembly. The connecting bar assembly includes a first connecting bar extending circumferentially and a plurality of second connecting bars spaced apart circumferentially. The lead terminals include a first lead terminal and a second lead terminal located at the welding end. The plurality of first lead terminals and the plurality of second lead terminals in the multiphase winding circuit are spaced apart axially. The plurality of first lead terminals are connected to each other through the first connecting bar, and the plurality of second lead terminals are connected to the plurality of second connecting bars one by one.

[0014] On the other hand, embodiments of this application also provide an electric motor, which includes the aforementioned short-pitch flat wire winding stator.

[0015] The short-pitch flat wire winding stator of this application includes a stator winding and a stator core. Each winding module of the stator winding includes multiple winding coil structures and a connecting coil structure. Multiple winding coil structures with the same span are wound only in two stator slots to form a spiral winding module. Each winding module can be arranged circumferentially in different sets of stator slots. The different winding modules arranged circumferentially are connected by the connecting coil structure to meet the winding requirements of the short-pitch winding and form a complete stator winding.

[0016] Therefore, the short-pitch flat wire winding stator of this application embodiment can achieve stator winding by using only multiple winding coil structures and one connecting coil structure, without the need to set interlayer wire types between the winding coil structures. This reduces the types of wire types, thereby reducing assembly difficulty and manufacturing costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a winding diagram of the short-pitch flat wire winding stator according to an embodiment of this application; Figure 2 This is a winding diagram of a phase winding circuit of a short-pitch flat wire winding stator according to an embodiment of this application; Figure 3 This is a partial winding diagram of a winding branch of a short-pitch flat wire winding stator according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a short-pitch flat wire winding stator according to an embodiment of this application; Figure 5 This is a schematic diagram of the connection bar assembly of the short-pitch flat wire winding stator according to an embodiment of this application; Figure 6 This is a schematic diagram of the winding coil structure of the short-pitch flat wire winding stator according to an embodiment of this application. Figure 7 This is a schematic diagram of the structure of the short-pitch flat wire winding stator with lead terminals according to an embodiment of this application; Figure 8 This is a schematic diagram of the connecting coil structure with lead terminals of the short-pitch flat wire winding stator according to an embodiment of this application. Figure 9 This is a schematic diagram of the structure of the first connecting coil of the short-pitch flat wire winding stator according to an embodiment of this application; Figure 10This is a schematic diagram of the structure of the second connecting coil with different spans in the short-pitch flat wire winding stator of this application embodiment.

[0019] Explanation of icon numbers: 1. Stator winding; 1a. Crown end; 1b. Welded end; 2. Stator core; 2a. Stator slot; 10. Winding circuit; 20. Winding branch; 30. Winding module; 31. Winded coil structure; 311. First conductor side; 312. First bridging portion; 313. First welding portion; 32. Connecting coil structure; 321. Second conductor side; 322. Second bridging portion; 323. Second welding portion; 33. First connecting coil; 34. Second connecting coil; 40. Lead terminal; 41. First lead terminal; 42. Second lead terminal; 50. Connecting bus assembly; 51. First connecting bus; 511. Connecting main body; 512. Conductive connection portion; 52. Second connecting bus. Detailed Implementation

[0020] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0021] like Figures 1 to 10 As shown, this application embodiment provides a short-pitch flat wire winding stator, which includes a stator winding 1 and a stator core 2. The stator core 2 includes a plurality of stator slots 2a spaced apart along the circumference. The stator winding 1 includes a multi-phase winding circuit 10. Each phase winding circuit 10 includes a plurality of parallel winding branches 20. Each winding branch 20 includes a plurality of winding modules 30 wound in different stator slots 2a. Each winding module 30 includes a plurality of connected winding coil structures 31 and a connecting coil structure 32. The plurality of winding coil structures 31 in each winding module 30 are wound into a spiral structure in two spaced stator slots 2a. Each winding module 30 is connected to an adjacent winding module 30 by a connecting coil structure 32.

[0022] The short-pitch flat wire winding stator of this application embodiment includes a stator winding 1 and a stator core 2. The stator winding 1 includes a multi-phase winding circuit 10. Each phase winding circuit 10 includes multiple parallel winding branches 20. Each winding branch 20 includes multiple winding modules 30 wound in different stator slots 2a. The coil structure in the winding module 30 spans two stator slots 2a that are spaced apart. The multiple winding modules 30 are arranged in sequence along the circumference and connected to each other.

[0023] Each winding module 30 includes multiple winding coil structures 31 and a connecting coil structure 32. Multiple winding coil structures 31 with the same span are wound only in two stator slots 2a to form a spiral winding module 30. That is, the winding coil structures 31 are connected by overlapping windings. There is no need to set the connecting line type between layers. Independent winding modules 30 can be formed by simply repeating the crossing of layers. Between different winding modules 30 arranged in the circumferential direction, they are connected by the connecting coil structure 32 to meet the winding requirements of short-pitch windings and form a complete stator winding 1.

[0024] Therefore, the short-pitch flat wire winding stator of this application embodiment can achieve the winding of stator winding 1 by using only multiple winding coil structures 31 and one connecting coil structure 32, without setting interlayer wire types between the winding coil structures 31. This reduces the types of wire types and thus reduces assembly difficulty and manufacturing cost.

[0025] Furthermore, the stator winding 1 of the short-pitch flat wire winding stator in this embodiment realizes the winding design of the short-pitch winding under the flat wire connection method, which effectively reduces torque pulsation and NVH (Noise, Vibration and Harshness).

[0026] In the embodiments of this application, such as Figure 1 As shown, the stator core 2 includes 48 stator slots 2a spaced circumferentially. The stator winding 1 includes three-phase winding circuits 10, namely U, V, and W phase winding circuits 10. Each phase winding circuit 10 includes two parallel winding branches 20, namely U1 winding branch 20, U2 winding branch 20, V1 winding branch 20, V2 winding branch 20, W1 winding branch 20, and W2 winding branch 20. The U, V, and W phase winding circuits 10 are arranged sequentially circumferentially, and the two winding branches 20 of each phase winding circuit 10 are located in adjacent stator slots 2a. Figure 2 As shown, Figure 2 The diagram shows the winding diagram of the V-phase winding circuit 10 in each stator slot 2a, where the circled numbers are the slot numbers of stator slot 2a.

[0027] like Figure 6As shown in the embodiment of this application, the short-pitch flat wire winding stator includes each winding coil structure 31 comprising two first conductor sides 311, a first bridging portion 312, and two first welding portions 313. The first bridging portion 312 is connected between the first ends of the two first conductor sides 311, and the two first welding portions 313 are respectively connected to the second ends of the two first conductor sides 311, and both first welding portions 313 extend toward the opposite first conductor side 311.

[0028] In specific implementation, the structure and model of each winding coil structure 31 are the same. The two first conductor sides 311 of the winding coil structure 31 are respectively located in two stator slots 2a that are spaced apart. The first ends of the two first conductor sides 311 are connected by a first bridging part 312. The number of stator slots 2a spanned by the first bridging part 312 is the span of the winding coil structure 31. The second ends of the two first conductor sides 311 are respectively connected to a first welding part 313. The two first welding parts 313 extend toward the first conductor side 311 on the opposite side, that is, their torsional directions are opposite to each other. The first welding parts 313 of the winding coil structure 31 in the winding module 30 can contact each other, which facilitates welding connection and realizes the effect of sequential connection of multiple winding coil structures 31 in the winding module 30.

[0029] Furthermore, each stator slot 2a includes 2N radially stacked receiving layers, and the winding coil structure 31 spans the 2i and 2i+1 layers of the two stator slots 2a, where N / 2≥i≥1, and i and N are both positive integers. Figure 3 As shown, in the two winding coil structures 31 connected in each winding module 30, the two first conductor edges 311 of one winding coil structure 31 span the second and third layers of the two stator slots 2a respectively, and the two first conductor edges 311 of the other winding coil structure 31 span the fourth and fifth layers of the same two stator slots 2a. The first conductor edge 311 in the third layer and the first conductor edge 311 in the fourth layer are connected by the first welding part 313 to form an integral spiral structure. The winding coil structures 31 of the same type are neatly arranged in the two stator slots 2a, which reduces the assembly difficulty.

[0030] like Figure 2 and Figure 3 As shown in the embodiment of this application, the short-pitch flat wire winding stator includes multiple first connecting coils 33 and multiple second connecting coils 34 in the multiple connecting coil structures 32. The first connecting coils 33 are arranged across the first receiving layer of the two stator slots 2a, and the second connecting coils 34 are arranged across the 2Nth receiving layer of the two stator slots 2a. Each winding module 30 is connected to its adjacent winding modules 30 on both sides through the first connecting coils 33 and the second connecting coils 34 respectively.

[0031] In this embodiment, each winding module 30 is connected to its adjacent winding modules 30 via a first connecting coil 33 and a second connecting coil 34, thereby achieving connection and conduction of multiple winding modules 30 after winding. The first connecting coil 33 spans across the first receiving layer of two stator slots 2a, and the second connecting coil 34 spans across the 2Nth receiving layer of two stator slots 2a. Their positions are adapted to the winding of multiple winding coil structures 31. The first connecting coil 33 is connected to the winding coil structure 31 in the second receiving layer of two stator slots 2a, and the second connecting coil 34 is connected to the winding coil structure 31 in the 2N-1th receiving layer of two stator slots 2a, thus achieving the connection effect between winding modules 30 and forming a complete winding branch 20.

[0032] like Figure 8 As shown in the embodiment of this application, the short-pitch flat wire winding stator includes each connecting coil structure 32 comprising two second conductor sides 321, a second bridging portion 322, and two second welding portions 323. The second bridging portion 322 is connected between the first ends of the two second conductor sides 321, and the two second welding portions 323 are respectively connected to the second ends of the two second conductor sides 321, and the two second welding portions 323 extend in the same direction.

[0033] In specific implementation, the two second conductor sides 321 of the connecting coil structure 32 are respectively located in two stator slots 2a spaced apart. The first ends of the two second conductor sides 321 are connected by a second bridging portion 322. The number of stator slots 2a spanned by the second bridging portion 322 is the span of the connecting coil structure 32. The second ends of the two second conductor sides 321 are respectively connected to a second welding portion 323. The two second welding portions 323 extend in the same direction, that is, their turning directions are the same. They can contact the first welding portion 313 of the winding coil structure 31 of the two winding modules 30 respectively, which facilitates the welding connection between the connecting coil structure 32 and the two corresponding winding coil structures 31, and realizes the connection effect between the winding modules 30.

[0034] Furthermore, the two second welding parts 323 have the same twisting direction, so that when they are connected with the first welding part 313, there will be no cross-shaped reverse twisting lines in the stator winding 1, and the welding ends 1b of the stator winding 1 are neatly arranged, which further reduces the welding process difficulty of the first welding part 313 and the second welding part 323.

[0035] like Figure 9 and Figure 10As shown in the embodiment of this application, the short-pitch flat wire winding stator has multiple winding coil structures 31 with a span of Y, multiple first connecting coils 33 with a span of Y+1, and multiple second connecting coils 34 including two types of second connecting coils 34 with spans of Y and Y+2 respectively.

[0036] In specific implementation, since the span Y of multiple winding coil structures 31 is smaller than the pole pitch of stator winding 1, the span of the first connecting coil 33 is set to Y+1, and the span of the second connecting coil 34 is set to Y and Y+2 respectively. This can meet the connection requirements of different winding modules 30 in multiple stator slots 2a of stator core 2, thereby forming a complete stator winding 1 in stator core 2 and realizing the connection and winding of each winding branch 20.

[0037] Furthermore, setting the span of the first connecting coil 33 to Y+1 facilitates the arrangement and connection of the first connecting coil 33 in the first layer of each stator slot 2a, making the welding ends 1b of the stator winding 1 neatly arranged; while setting the span of the second connecting coil 34 to Y and Y+2 respectively, it can be used to connect different winding modules 30, realizing the matching arrangement with the first connecting coil 33 and the winding coil structure 31, forming a complete stator winding 1.

[0038] In some alternative embodiments, the span of the second connecting coil 34 can be set to Y+1, while the first connecting coil 33 may include two spans, Y and Y+2. This application does not limit this.

[0039] In the short-pitch flat wire winding stator of this application embodiment, each phase winding circuit 10 includes two parallel winding branches 20, and multiple second connecting coils 34 are arranged alternately in the circumferential direction with spans of Y+2 and Y.

[0040] In this embodiment, multiple second connecting coils 34 are arranged alternately in the circumferential direction with spans of Y+2 and Y, which are adapted to the number of parallel branches of the winding branch 20, so as to meet the winding requirements of the stator winding 1 in the corresponding number of stator slots 2a, and form a complete stator winding 1.

[0041] In specific implementation, such as Figure 1 and Figure 2 As shown, the stator core 2 includes 48 stator slots 2a spaced circumferentially, the stator winding 1 includes a 3-phase winding circuit 10, each phase winding circuit 10 includes 2 parallel winding branches 20, the span of the winding coil structure 31 in each winding module 30 is 5, and multiple second connecting coils 34 are arranged alternately circumferentially with spans of 7 and 5.

[0042] In the second embodiment of this application, the short-pitch flat wire winding stator includes three parallel winding branches 20 in each phase winding circuit 10, and multiple second connecting coils 34 are alternately distributed circumferentially in a span arrangement of Y+2, Y and Y.

[0043] In the second embodiment of this application, a plurality of second connecting coils 34 are arranged alternately in the circumferential direction with spans of Y+2, Y and Y, which are adapted to the number of parallel branches of the winding branch 20, so as to meet the winding requirements of the stator winding 1 in the corresponding number of stator slots 2a, and form a complete stator winding 1.

[0044] In specific implementation, the stator core 2 includes 54 stator slots 2a spaced circumferentially, the stator winding 1 includes a 3-phase winding circuit 10, each phase winding circuit 10 includes 3 parallel winding branches 20, the span of the winding coil structure 31 in each winding module 30 is 8, and multiple second connecting coils 34 are arranged alternately circumferentially with spans of 10, 8 and 8.

[0045] In any embodiment of this application, each stator slot 2a of the stator core 2 may include 6, 8 or 10 receiving layers to accommodate a corresponding number of conductor sides.

[0046] In this embodiment of the short-pitch flat wire winding stator, the stator winding 1 has a crown end 1a and a welding end 1b on both sides of the axial direction. Each winding branch 20 also includes a lead terminal 40. The lead terminal 40 is located at the crown end 1a and is connected to the winding module 30 located in the first receiving layer or the second Nth receiving layer; or, the lead terminal 40 is located at the welding end 1b and is connected to the winding module 30 located in the first and second receiving layers or the second N-1 and the second Nth receiving layers. The provision of the lead terminal 40 facilitates the output and connection of each winding branch 20 of the stator winding 1, thereby facilitating conductive connection.

[0047] In this embodiment, the first bridging portion 312 of the winding coil structure 31 and the second bridging portion 322 of the connecting coil structure 32 are both located at the same end of the stator winding 1 to form a crown end 1a. Since the first bridging portion 312 and the second bridging portion 322 are both integral structures bridging between the two conductor sides, their location at the same end ensures that the ends of the stator winding 1 are neatly arranged, facilitating the lead-out and connection of terminals or connecting wires. The first welding portion 313 of the winding coil structure 31 and the second welding portion 323 of the connecting coil structure 32 are both located at the other end of the stator winding 1 to form a welding end 1b. The fact that the first welding portion 313 and the second welding portion 323 are both located at the same end on the other side of the stator winding 1 facilitates their arrangement, avoids interference with other structures that would affect the welding operation, and facilitates the lead-out and connection of terminals or connecting wires after welding.

[0048] In this embodiment, the lead terminal 40 is located at the welding end 1b, and can be connected to the winding module 30 located in the first and second receiving layers, or to the winding module 30 located in the second-N-1 and second-N receiving layers. That is, it is led out from the first welding part 313 and the second welding part 323 located in the first and second receiving layers, or from the first welding part 313 and the second welding part 323 located in the second-N-1 and second-N receiving layers. This arrangement optimizes the position of the lead terminal 40, so that all the lead terminals 40 are led out from the inside or outside of the stator winding 1. The overall structure is compact, which facilitates the interconnection between the lead terminals 40 and the connection with external circuits.

[0049] Furthermore, in the process of setting the lead terminal 40, it is only necessary to lengthen the first welding part 313 and the second welding part 323 when manufacturing the partial winding coil structure 31 and the partial connecting coil structure 32 to form the lead terminal 40 part connected to the first welding part 313 and the second welding part 323, which simplifies the manufacturing process of the winding coil structure 31 and the connecting coil structure 32.

[0050] In some optional embodiments of this application, the lead terminal 40 is located at the crown end 1a, which can be connected to the winding module 30 located in the first receiving layer or the second N receiving layer, that is, directly led out by the first bridging part 312 or the second bridging part 322. This arrangement optimizes the position of the lead terminal 40, so that all the lead terminals 40 are led out from the inside or outside of the stator winding 1. The overall structure is compact and facilitates the interconnection between the lead terminals 40 and the connection with external circuits.

[0051] like Figure 5 As shown in the embodiment of this application, the short-pitch flat wire winding stator includes a stator winding 1 that further includes a connecting bar assembly 50. The connecting bar assembly 50 includes a first connecting bar 51 extending circumferentially and a plurality of second connecting bars 52 spaced apart circumferentially. The lead terminals 40 include a first lead terminal 41 and a second lead terminal 42 disposed at the welding end 1b. The plurality of first lead terminals 41 and the plurality of second lead terminals 42 in the multiphase winding circuit 10 are spaced apart axially. The plurality of first lead terminals 41 are connected to each other through the first connecting bar 51, and the plurality of second lead terminals 42 are connected to the plurality of second connecting bars 52 one by one.

[0052] like Figure 5As shown in the embodiments of this application, the first connecting row 51 of the connecting row assembly 50 can connect multiple first lead terminals 41 to achieve conductive connection and common lead-out among multiple first lead terminals 41. The first connecting row 51 serves as a star-point connecting row of multiple first lead terminals 41, realizing the neutral line lead-out effect of the multiphase winding circuit 10. Multiple second connecting rows 52 are distributed circumferentially to correspond one-to-one with multiple second lead terminals 42 and achieve corresponding connection. As independent lead-out rows of each winding branch 20, each second connecting row 52 can be independently connected to the external circuit.

[0053] Specifically, adjacent winding modules 30 with lead terminals 40 are arranged sequentially along the circumference, or are spaced apart by at most one winding module 30 without lead terminals 40. This arrangement allows the lead terminals 40 to be arranged compactly, facilitating connection of the connecting assembly 50.

[0054] Specifically, the first connecting bar 51 includes a connecting main body 511 extending circumferentially and a plurality of conductive connecting parts 512 spaced circumferentially from the connecting main body 511. Each conductive connecting part 512 is correspondingly disposed with and connected to a plurality of first lead terminals 41. The first connecting bar 51 is connected to an external circuit through the connecting main body 511 to achieve a neutral wire lead-out effect. Each conductive connecting part 512 protrudes axially from the connecting main body 511 to avoid interference between the connecting main body 511 and the external circuit when connected to the first lead terminal 41.

[0055] Specifically, the first connecting bar 51 and the second connecting bar 52 are respectively connected to opposite sides of the lead terminal 40 in the radial direction, one of which is connected to the inner circumference of the lead terminal 40 and the other is connected to the outer circumference of the lead terminal 40, so as to avoid interference between the two and cause a connection.

[0056] By configuring the connecting busbar assembly 50, a star-point connection effect is achieved between its first connecting busbar 51 and the lead terminal 40, while simultaneously achieving a three-phase output effect for its second connecting busbar 52. Furthermore, through the structural and positional arrangement of the connecting body 511 and multiple conductive connecting parts 512 of the first connecting busbar 51, as well as the positional relationship between the first connecting busbar 51 and the second connecting busbar 52, an optimized copper busbar position is achieved. The connecting busbar assembly 50 has a compact overall layout and simple structure, reducing material costs and manufacturing process difficulty, thereby lowering the overall manufacturing cost.

[0057] This application also provides an electric motor, which includes the aforementioned short-pitch flat wire winding stator.

[0058] In specific implementation, the motor in this application embodiment includes a short-pitch flat wire winding stator, which includes a stator winding 1 and a stator core 2. Each winding module 30 of the stator winding 1 includes multiple winding coil structures 31 and a connecting coil structure 32. Multiple winding coil structures 31 with the same span are wound only in two stator slots 2a to form a spiral winding module 30, and each winding module 30 can be arranged circumferentially in different groups of stator slots 2a. Between different winding modules 30 arranged circumferentially, they are connected by connecting coil structures 32. At least some of the connecting coil structures 32 have a span greater than the span of the winding coil structures 31, thereby meeting the winding requirements of the short-pitch winding and forming a complete stator winding 1.

[0059] Therefore, in the short-pitch flat wire winding stator of the motor in this application embodiment, the stator winding 1 can be wound by using only a plurality of winding coil structures 31 with the same wire type and a connecting coil structure 32 with a different wire type than the winding coil structure 31. There is no need to set interlayer wire types between the winding coil structures 31, thus reducing the number of wire types and achieving the effect of reducing assembly difficulty and manufacturing cost.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0061] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A short-pitch flat wire winding stator, characterized in that, It includes a stator winding (1) and a stator core (2), wherein the stator core (2) includes a plurality of stator slots (2a) spaced apart along the circumferential direction; The stator winding (1) includes a multi-phase winding circuit (10), each phase of the winding circuit (10) includes multiple parallel winding branches (20), each winding branch (20) includes multiple winding modules (30) wound in different stator slots (2a), each winding module (30) includes multiple connected winding coil structures (31) and a connecting coil structure (32), the multiple winding coil structures (31) in each winding module (30) are wound into a spiral structure in two stator slots (2a) spaced apart, and each winding module (30) is connected to the adjacent winding module (30) through the connecting coil structure (32).

2. The short-pitch flat wire winding stator according to claim 1, characterized in that, Each stator slot (2a) includes 2N layers of receiving layers stacked along the radial direction. The plurality of connecting coil structures (32) include a plurality of first connecting coils (33) and a plurality of second connecting coils (34). The first connecting coils (33) span across the first layer of the receiving layer of the two stator slots (2a), and the second connecting coils (34) span across the second N layer of the receiving layer of the two stator slots (2a). Each winding module (30) is connected to the winding modules (30) adjacent to it on both sides through the first connecting coils (33) and the second connecting coils (34).

3. The short-pitch flat wire winding stator according to claim 2, characterized in that, The span of each of the multiple wound coil structures (31) is Y, the span of each of the multiple first connecting coils (33) is Y+1, and the multiple second connecting coils (34) include two types of second connecting coils (34) with spans of Y and Y+2 respectively.

4. The short-pitch flat wire winding stator according to claim 3, characterized in that, Each phase of the winding circuit (10) includes two parallel winding branches (20), and multiple second connecting coils (34) are alternately distributed along the circumference in a span of Y+2 and Y.

5. The short-pitch flat wire winding stator according to claim 3, characterized in that, Each phase of the winding circuit (10) includes three parallel winding branches (20), and multiple second connecting coils (34) are alternately distributed along the circumference in a span of Y+2, Y and Y.

6. The short-pitch flat wire winding stator according to claim 2, characterized in that, Each of the winding coil structures (31) includes two first conductor sides (311), a first bridging portion (312), and two first welding portions (313). The first bridging portion (312) is connected between the first ends of the two first conductor sides (311), and the two first welding portions (313) are respectively connected to the second ends of the two first conductor sides (311), and the two first welding portions (313) extend toward the opposite first conductor side (311).

7. The short-pitch flat wire winding stator according to claim 2, characterized in that, Each of the aforementioned connecting coil structures (32) includes two second conductor sides (321), a second bridging portion (322), and two second welding portions (323). The second bridging portion (322) is connected between the first ends of the two second conductor sides (321), and the two second welding portions (323) are respectively connected to the second ends of the two second conductor sides (321), and the two second welding portions (323) extend in the same direction.

8. The short-pitch flat wire winding stator according to claim 2, characterized in that, The stator winding (1) has a crown end (1a) and a weld end (1b) on both sides of the axial direction, and each winding branch (20) also includes a lead terminal (40). The lead terminal (40) is located at the crown end (1a) and is connected to the winding module (30) located in the first layer of the receiving layer or in the second layer of the receiving layer; Alternatively, the lead terminal (40) is located at the welding end (1b) and connected to the winding module (30) located in the first and second layers of the receiving layer, or in the second-N-1 and second-N layers of the receiving layer.

9. The short-pitch flat wire winding stator according to claim 8, characterized in that, The stator winding (1) further includes a connecting bar assembly (50), which includes a first connecting bar (51) extending along the circumferential direction and a plurality of second connecting bars (52) spaced apart along the circumferential direction. The lead terminals (40) include a first lead terminal (41) and a second lead terminal (42) disposed at the welding end (1b). The plurality of first lead terminals (41) and the plurality of second lead terminals (42) in the multiphase winding circuit (10) are spaced apart in the axial direction. The plurality of first lead terminals (41) are connected through the first connecting bar (51), and the plurality of second lead terminals (42) are connected one-to-one with the plurality of second connecting bars (52).

10. An electric motor, characterized in that, Includes a short-pitch flat wire winding stator as described in any one of claims 1 to 9.

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