CN117767601A

CN117767601A - Continuous wave winding flat wire motor, stator, power assembly and vehicle thereof

Info

Publication number: CN117767601A
Application number: CN202311519586.8A
Authority: CN
Inventors: 余国权; 曹超; 毋超强
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2023-11-13
Filing date: 2023-11-13
Publication date: 2024-03-26

Abstract

The application relates to the technical field of motors, in particular to a continuous wave winding flat wire motor, a stator, a power assembly and a vehicle. The stator comprises a stator core and a stator winding, wherein the stator core comprises a first end face, a second end face and a plurality of winding grooves, and the first end face and the second end face are opposite along the axial direction of the stator. The stator winding includes a plurality of continuous wave wound flat wires, each flat wire including a plurality of plug wire segments, a plurality of first span segments, and a plurality of second span segments. Each first span segment is exposed out of the first end face, and the layer number of the two plug wire segments connected with each first span segment is different by 1. Each second line crossing section is exposed out of the second end face, and the layer number of the two plug wire sections connected with each second line crossing section is different by 1. The sum of the pitch of each first span and the pitch of each second span is equal to the number of winding slots divided by the pole pair number of the stator winding. The stator winding of the stator is formed by winding a plurality of flat wires, and the height of the end part of the stator winding can be reduced.

Description

Continuous wave winding flat wire motor, stator, power assembly and vehicle thereof

Technical Field

The application relates to the technical field of electric vehicles, in particular to a continuous wave winding flat wire motor, a stator, a power assembly and a vehicle.

Background

In recent years, flat wire winding motors have been used by more and more motor and powertrain manufacturers to increase the efficiency, power density, and torque density of the motors. Compared with a round wire winding motor, the flat wire winding motor has higher copper fullness rate. Under the same slot area, the flat wire motor can be embedded with more copper wires, so that the phase resistance of the motor is reduced, the winding loss is reduced, and the efficiency of the motor is further improved. Under the condition of the same copper consumption in the slots, the flat wire motor can reduce the size of the slots, increase the sizes of the teeth and the yoke, reduce the magnetic saturation degree of the motor stator, increase the peak torque and power of the motor, further improve the torque density and power density of the motor, and simultaneously reduce the magnetic saturation degree of the stator, thereby being beneficial to improving the noise, vibration and harshness (noise, vibration, harshness, NVH) performance.

The existing flat wire winding motor adopts a flat wire hairpin to enable the height of the end part of the welding side of the motor to be larger, which is not beneficial to the miniaturization development of the motor.

Disclosure of Invention

The utility model provides a flat wire motor of continuous wave winding and stator, power assembly and vehicle thereof, the stator winding of this stator can reduce stator winding's tip height for continuous wave winding form, is favorable to the miniaturized development of motor.

In a first aspect, the present application provides a stator of a continuous wave wound flat wire motor, the stator comprising a stator core and a stator winding, the stator core comprising a first end face, a second end face and a plurality of winding slots, the first end face and the second end face being opposite along an axial direction of the stator, each winding slot extending through the stator core along the axial direction of the stator. The stator winding includes a plurality of continuous wave wound flat wires, each flat wire including a plurality of plug wire segments, a plurality of first span segments, and a plurality of second span segments. Each plug wire segment is embedded in one winding slot, and each winding slot is used for accommodating a plurality of plug wire segments which are sequentially stacked along the radial direction of the stator. Each first span segment is exposed out of the first end face, and the layer number of the two plug wire segments connected with each first span segment is different by 1. Each second line crossing section is exposed out of the second end face, and the layer number of the two plug wire sections connected with each second line crossing section is different by 1. The sum of the pitch of each first span and the pitch of each second span is equal to the number of winding slots divided by the pole pair number of the stator winding. The first span line segment and the pitch may be the same or different from the second span line segment. When the pitches of the first span line segment and the second span line segment are equal, the stator winding is a whole-pitch winding, and the stator winding can be realized by one pitch. When the pitches of the first span line segment and the second span line segment are unequal, the stator winding is a short-distance winding, and the stator winding can be realized through two pitches.

The stator winding of the stator is formed by winding a plurality of flat wires, two ends of each flat wire are the wiring ends of the stator winding, a large number of welding points do not exist at two axial ends of the stator, the preparation process of the stator winding can be simplified, the height of the end part of the stator winding can be reduced, and the flat wire motor is miniaturized. The first span line section and the second span line section are of a one-layer structure along the radial direction of the stator, so that winding cross layers can be reduced, and the influence of the cross layers on the height of the stator winding end part and the complexity of wiring are reduced. In addition, the stator winding can be realized by one pitch or two pitches, which is beneficial to simplifying the winding process and facilitating the automatic production.

In one possible implementation, each flat wire includes a first lead-out section and a second lead-out section, and the plurality of plug wire sections, the plurality of first span sections, and the plurality of second span sections are distributed between the first lead-out section and the second lead-out section. The first lead-out section and the second lead-out section are respectively exposed out of the first end face of the stator. One plug wire section connected with the first lead-out section is arranged at the innermost side of one winding slot along the radial direction of the stator, and the other plug wire section connected with the second lead-out section is arranged at the outermost side of the other winding slot. The first leading-out section and the second leading-out section are positioned on the same side of the axial direction of the stator core, and wiring is facilitated.

Specifically, the first lead-out section and the second lead-out section are arranged at intervals relative to each other along the radial direction of the stator, and a plurality of first span sections are arranged between the first lead-out section and the second lead-out section at intervals. For the same flat wire, along the radial direction of the stator, the first lead-out section is positioned at the outermost side of the flat wire, and the second lead-out section is positioned at the innermost side of the flat wire, so that the first cross-line section and the cross-slot wiring are facilitated.

In a possible implementation manner, the plurality of first span segments are divided into a plurality of groups, the plurality of groups of first span segments are distributed at intervals along the circumferential direction of the stator, the plurality of first span segments in the same group are arranged along the radial direction of the stator, and the first span segments in the same group are free from bridging between the two segments, so that the height of the end part of the stator winding can be reduced, and the complexity of winding is reduced.

Wherein, along the radial of stator, wherein a set of first span is arranged between first extraction section and second extraction section, and wherein the quantity of a set of first span is less than 1 in the number of layers of inserting line section in every winding slot. The number of layers in each winding slot is the same. The first lead-out section and the second lead-out section do not increase the radial dimension of the stator winding in this region.

In one possible implementation manner, among a plurality of first span segments in the same group, a wire insertion segment connected to one end of each first span segment is accommodated in one winding slot, and a wire insertion segment connected to the other end of each first span segment is accommodated in the other winding slot. That is, the wire plugging sections connected to the two ends of each first wire plugging section are respectively located in two winding slots, the wire plugging sections connected to one end of each first wire plugging section in the same group are located in the same winding slot, and the wire plugging sections connected to the other end of each first wire plugging section in the same group are located in the same winding slot. The pitch of the plurality of insert segments of the same flat wire distributed along the circumferential direction of the stator is the pitch of the first span segment or the pitch of the second span segment.

In one possible implementation, the stator winding comprises a multi-phase winding, each phase winding comprising two wire sets, each wire set comprising a plurality of flat wires. The first lead-out section in the lead-out group and the first lead-out section in the other lead-out group are arranged at intervals along the circumferential direction of the stator, and the second lead-out section in the lead-out group and the second lead-out section in the other lead-out group are arranged at intervals along the circumferential direction of the stator. The first span and the second span in one wire group are symmetrical with the first span and the second span in the other wire group along the axial center of the stator.

In the same wire group, along the circumferential direction of the stator, the slot phase of the winding slot where the wire inserting sections of any two adjacent flat wires are located is convenient for the wire winding connection of the flat wires.

In addition, in the same wire group, a groove is formed between the first leading-out sections of any two adjacent flat wires along the circumferential direction of the stator, and a groove is formed between the second leading-out sections of any two adjacent flat wires. The first leading-out sections and the second leading-out sections of the flat wires in the same wire group can be distributed in a centralized manner along the circumference of the stator, so that the stator winding is convenient to converge.

In one possible implementation manner, the first lead-out sections of all the flat wires are arranged at intervals along the circumferential direction of the stator, and a slot position of one winding slot is arranged between any two adjacent first lead-out sections at intervals. The second leading-out sections of all the flat wires are arranged at intervals along the circumferential direction of the stator, and a slot position of a winding slot is arranged between any two adjacent second leading-out sections at intervals. All the first leading-out sections and the second leading-out sections of the stator winding can be intensively distributed along the circumferential direction of the stator, so that the stator winding is convenient to converge.

In one possible implementation, the stator winding includes a multi-phase winding, each phase winding being electrically associated with a respective phase. The stator includes a plurality of bus bars arranged at the first end face, the plurality of bus bars being arranged at intervals along a circumferential direction of the stator, each bus bar being for connecting an input of a phase winding and a corresponding phase electricity.

Specifically, when each phase winding includes at least one branch, and each branch includes at least two series-connected flat wires, the stator includes a plurality of connection rows arranged at the first end face, each connection row for connecting the two series-connected flat wires. The plurality of connecting rows are arranged in a staggered manner along the circumferential direction of the stator, any two connecting rows are arranged at intervals along the radial direction or the axial direction of the stator, and each busbar is arranged at one side, far away from the axis of the stator, of any connecting row along the radial direction of the stator, so that phase electricity is conveniently connected.

When each phase winding comprises a plurality of branches connected in parallel, each branch comprises at least one flat wire or at least two flat wires connected in series, the stator comprises a plurality of parallel rows arranged at the first end face, each parallel row being for connection to the input terminals and the bus bars of the plurality of branches of the same phase.

In a possible implementation manner, along the circumferential direction of the stator, the first span segment comprises two first extension segments and a first fold segment connected between the two first extension segments, wherein the first fold segment is arranged at an included angle with the radial direction of the stator, so that the distances between the two first extension segments and the axis of the stator are different, and the first span segment is realized along the radial span of the stator. The difference of the distances between the two first extension sections and the axis of the stator is not smaller than the thickness of the flat wire along the radial direction of the stator, so that the layer numbers of the two plug wire sections connected with the two first extension sections in the winding slot can be different by 1.

Similarly, along the circumference of the stator, the second line-crossing section comprises two second extension sections and a second line-folding section connected between the two second extension sections, and the second line-folding section and the radial direction of the stator are arranged at an included angle, so that the distances between the two second extension sections and the axis of the stator are different, and the line-crossing of the second line-crossing section along the radial direction of the stator is realized. The difference of the distances between the two second extension sections and the axis of the stator is not smaller than the thickness of the flat wire along the radial direction of the stator, so that the layer numbers of the two plug wire sections connected with the two second extension sections in the winding slot can be different by 1.

In a second aspect, a flat wire motor is provided, the flat wire motor comprising a rotor and any one of the stators provided in the first aspect. The stator core comprises a central hole which is respectively communicated with the winding slots, the central hole penetrates through the stator core along the axial direction of the stator, and the rotor is accommodated in the central hole. The stator winding is electrified to form a magnetic field, so that the rotor can be driven to rotate.

In a third aspect, a powertrain is provided, including a speed reducer and any one of the flat wire motors provided in the second aspect, wherein a motor shaft of the flat wire motor is used for driving an input shaft connected with the speed reducer. The speed reducer can be replaced by a speed changer.

In a fourth aspect, a vehicle is provided, which may be an electric vehicle or a hybrid vehicle. The vehicle comprises wheels and a powertrain provided in the third aspect for driving the wheels.

The technical effects that can be achieved by the second aspect to the fourth aspect are referred to for the description of the technical effects that can be achieved by the corresponding design schemes in the first aspect, and the detailed description is not repeated here.

Drawings

Fig. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a powertrain according to an embodiment of the present disclosure;

Fig. 3 is a schematic structural view of a stator of a flat wire motor according to an embodiment of the present disclosure;

fig. 4a is a schematic structural diagram of a stator winding with continuous wave winding according to an embodiment of the present application;

FIG. 4b is an enlarged detail view at A in FIG. 4 a;

fig. 4c is a schematic structural view of a flat wire of a stator according to an embodiment of the present disclosure;

fig. 4d is a schematic structural view of a flat wire of a stator according to an embodiment of the present disclosure;

fig. 5a is a schematic structural diagram of a flat wire and a stator core of a stator according to an embodiment of the present disclosure;

fig. 5b is a schematic structural view of a flat wire of a stator and a stator core according to an embodiment of the present disclosure, as viewed along a radial direction of the stator;

fig. 5c is a schematic structural diagram of a flat wire of a stator and a first end face of a stator core, which is observed along a radial direction of the stator according to an embodiment of the present application;

fig. 5d is a schematic structural diagram of one flat wire of the stator and a second end face of the stator core, which is observed along a radial direction of the stator according to the embodiment of the present application;

fig. 6a is a schematic diagram of a flat wire winding manner of a stator winding of a stator according to an embodiment of the present disclosure;

FIG. 6b is a schematic view of a portion of the area in FIG. 6 a;

fig. 7a is a schematic structural diagram of a phase winding of a stator according to an embodiment of the present disclosure;

Fig. 7b is a schematic diagram of a winding manner of a phase winding of a stator according to an embodiment of the present disclosure;

FIG. 7c is a schematic view of a portion of the area in FIG. 7 b;

fig. 8a is a schematic diagram of a winding manner of a stator winding of a stator according to an embodiment of the present disclosure;

FIG. 8b is a schematic view of a portion of the area in FIG. 8 a;

fig. 9a is a schematic diagram of a flat wire short-distance winding manner of a stator winding of a stator according to an embodiment of the present application;

FIG. 9b is a schematic view of a portion of the area in FIG. 9 a;

fig. 10a is a schematic structural diagram of a phase winding of a stator according to an embodiment of the present disclosure;

fig. 10b is a schematic diagram of a winding manner of a phase winding of a stator according to an embodiment of the present disclosure;

FIG. 10c is a schematic view of a portion of the area in FIG. 10 b;

fig. 11a is a schematic diagram of a winding manner of a stator winding of a stator according to an embodiment of the present disclosure;

FIG. 11b is a schematic view of a portion of the area in FIG. 11 a;

fig. 12a is a schematic diagram of a winding manner of a stator winding of a stator according to an embodiment of the present disclosure;

FIG. 12b is a schematic view of a portion of the area in FIG. 12 a;

fig. 13a is a schematic diagram of a winding manner of a stator winding of a stator according to an embodiment of the present disclosure;

FIG. 13b is a schematic view of a portion of the area in FIG. 13 a;

fig. 14a is a schematic diagram of a winding manner of a stator winding of a stator according to an embodiment of the present disclosure;

FIG. 14b is a schematic view of a portion of the area in FIG. 14 a;

fig. 15 is a schematic diagram of arrangement and end bus connection of stator windings of a stator provided in the embodiment of the application under the parallel branch number of 1;

FIG. 16a is a schematic circuit diagram illustrating the stator winding star connection of FIG. 15;

FIG. 16b is a schematic diagram of a bus structure of the stator winding star connection shown in FIG. 15;

FIG. 16c is a schematic view illustrating a connection structure between the stator windings and the bus structure of the stator windings shown in FIG. 15;

FIG. 17a is a schematic circuit connection diagram of the stator winding corner joint shown in FIG. 15;

FIG. 17b is a schematic view of a bus structure of the stator winding corner joint shown in FIG. 15;

FIG. 17c is a schematic view of a connection structure between the bus structure of the stator winding corner joint shown in FIG. 15 and the stator winding;

FIG. 18 is a schematic diagram of an arrangement and end bus connection of stator windings of a stator according to an embodiment of the present disclosure with a parallel branch number of 2;

FIG. 19a is a schematic diagram of a circuit connection of the stator winding star connection shown in FIG. 18;

FIG. 19b is a schematic diagram of a bus structure of the stator winding star connection shown in FIG. 18;

FIG. 19c is a schematic view of a connection structure between the stator windings and the bus structure of the stator windings shown in FIG. 18;

FIG. 20 is a schematic circuit connection diagram of the stator winding corner joint shown in FIG. 18;

FIG. 21 is a schematic diagram of an arrangement and end bus connection of stator windings of a stator according to an embodiment of the present disclosure with a number of parallel branches of 3;

FIG. 22a is a schematic circuit diagram illustrating the stator winding star connection of FIG. 21;

FIG. 22b is a schematic diagram of a bus structure of the stator winding star connection shown in FIG. 21;

FIG. 22c is a schematic diagram illustrating a connection structure between the stator windings and the bus structure of the stator windings shown in FIG. 21;

FIG. 23 is a schematic circuit connection diagram of the stator winding corner joint shown in FIG. 21;

fig. 24 is a schematic diagram of arrangement and end bus connection of stator windings of a stator provided in the embodiment of the present application under a parallel branch number of 6;

FIG. 25 is a schematic diagram of a circuit connection of the stator winding star connection shown in FIG. 24;

FIG. 26 is a schematic circuit connection diagram of the stator winding corner joint shown in FIG. 24;

fig. 27 is a schematic diagram of arrangement and end bus connection of stator windings of a stator provided in the embodiment of the application under the parallel branch number of 1;

FIG. 28 is a schematic circuit connection of the stator winding star connection shown in FIG. 27;

FIG. 29 is a schematic circuit connection diagram of the stator winding corner joint shown in FIG. 27;

FIG. 30 is a schematic diagram of an arrangement and end bus connection of stator windings of a stator according to an embodiment of the present disclosure with a parallel branch number of 2;

FIG. 31 is a schematic circuit diagram illustrating the stator winding star connection of FIG. 30;

FIG. 32 is a schematic circuit connection diagram of the stator winding corner joint shown in FIG. 30;

FIG. 33 is a schematic diagram of an arrangement and end bus connection of stator windings of a stator according to an embodiment of the present disclosure with a parallel branch number of 4;

FIG. 34 is a schematic circuit connection diagram of the stator winding star connection shown in FIG. 33;

fig. 35 is a schematic circuit connection diagram of the stator winding corner joint shown in fig. 33.

Detailed Description

Compared with a round wire winding motor, the flat wire winding motor has higher copper fullness rate and better performance in the aspects of motor efficiency, power density and torque density. The flat wire winding is commonly used in a flat wire hairpin type winding, namely a U-pin winding. The flat wire hairpin is of a preformed structure, after a plurality of flat wire hairpin are embedded into the stator groove, each single flat wire hairpin is welded together in a tungsten electrode gas shielded welding (tungsten inert gas welding, TIG) mode or a laser welding mode, so that welding heat is guaranteed not to damage the end winding through-flow part of the welding side, and a wire plug section of about 10mm is reserved on the welding side after the welding side is twisted for welding the flat wire hairpin two by two. The flat wire hairpin structure can increase the height of the axial end part of the motor, so that the motor occupies a large space, and the motor is not beneficial to realizing miniaturization.

Based on this, this application embodiment provides a continuous wave around flat wire motor and stator, power assembly and vehicle thereof, and this motor stator forms stator winding through the wire winding, and there is not welding side welding, can reduce motor axial dimensions, can optimize flat wire motor spatial layout, makes things convenient for the motor miniaturization.

To facilitate understanding of the solution, some terms in the motor are explained first.

And (3) a stator: the stator winding is electrified to generate a rotating magnetic field.

A rotor: the rotating component in the motor can rotate in a magnetic field generated by the stator winding and has the function of converting electric energy and mechanical energy.

Number of poles: i.e. the number of poles of the motor, which are divided into N and S poles, 1N pole and 1S pole are generally referred to as a pair of poles, i.e. the pole pair is 1. For example, when the pole pair number of the motor is 1, 2, 3, 4, the pole number of the motor is 2, 4, 6, 8.

Pitch y: the number of slots occupied by two effective sides of a single coil is, for example, pitch y=6, i.e., the two effective sides of the coil are separated by 6 slots, i.e., the two effective sides are respectively embedded in the 1 st slot and the 7 th slot.

Number of slots per pole q: the number of slots occupied by each phase winding under each pole is referred to as the number of slots per phase per pole.

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.

The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include, for example, "one or more" such forms of expression, unless the context clearly indicates to the contrary.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

Fig. 1 is a schematic diagram of an electric vehicle according to an embodiment of the present application. Referring to fig. 1, an electric vehicle provided in an embodiment of the present application includes a powertrain 1000, a transmission 2000, and wheels 3000. Powertrain 1000 drives wheels 3000 via a transmission 2000. Wherein the powertrain 1000 is configured to convert electrical energy into mechanical energy. The transmission mechanism 2000 is used for connecting the power assembly 1000 and the wheels 3000 in a transmission manner.

Fig. 2 is a schematic diagram of a powertrain 1000 according to an embodiment of the present application. As shown in fig. 2, a powertrain 1000 provided in an embodiment of the present application includes a flat wire motor 100 and a decelerator 200. Wherein the flat wire motor 100 is in driving connection with the decelerator 200. The flat wire motor 100 is used to drive a transmission 2000 of an electric vehicle through a decelerator 200. The flat wire motor 100 includes a motor stator 10, a rotor 20, a motor shaft 30, and a housing 40. The stator 10 is sleeved outside the rotor 20, the rotor 20 is coaxially fixed on the motor shaft 30, the motor shaft 30 is in transmission connection with the reducer 200, and the shell 40 is arranged outside the stator 10. The speed reducer 200 may be a transmission. The stator 10 includes a stator core 2 and a stator winding 1, and the stator winding 1 is wound around the stator core 2. The stator winding 1 is energized to form a magnetic field at the center of the stator core 2, and the rotor 20 is rotatable around the axis of the motor shaft 30 in the magnetic field.

Fig. 3 is a structure of a flat wire motor stator 10 provided in an embodiment of the present application, the stator 10 includes a stator core 2 and a stator winding 1, the stator core 2 includes a first end face a1, a second end face a2, and a plurality of winding slots R, the first end face a1 and the second end face a2 are opposite along an axial direction of the stator 10, and each winding slot R penetrates through the stator core 2 along the axial direction of the stator 10. The stator winding 1 is partially accommodated in the plurality of winding slots R, and the stator winding 1 has end windings protruding from the stator core 2 in the axial direction of the stator 10. As shown in fig. 3, the stator 10 further includes a bus structure 3, and the bus structure 3 is located on the first end surface a1 side of the stator core 2, and is used for bus the stator winding 1, so as to implement circuit connection of the flat wire motor 100.

Fig. 4a illustrates the structure of the stator winding 1 in fig. 3, the stator winding 1 being wound from a plurality of continuous wave wound flat wires 11, each flat wire 11 having a wire insertion section 110 parallel to the axial direction of the stator 10, the wire insertion section 110 being intended to be received in the winding slot R. The first lead-out section 113 and the second lead-out section 114 are formed at both ends of each flat wire 11, respectively, and the first lead-out section 113 and the second lead-out section 114 of one flat wire 11 are shown in a dotted circle in fig. 4a, and the first lead-out section 113 and the second lead-out section 114 are arranged at intervals along the circumferential direction of the stator 10. As shown in fig. 4a, all of the first lead-out sections 113 and the second lead-out sections 114 of the stator winding 1 are located at one end of the stator winding 1 in the circumferential direction of the stator 10. In the radial direction of the stator 10, all the first lead-out sections 113 are located in one layer and all the second lead-out sections 114 are located in another layer. All the first lead-out sections 113 are adjacently arranged and all the second lead-out sections 114 are adjacently arranged along the circumferential direction of the stator 10, facilitating the confluence connection of the confluence structure 3.

In connection with the enlarged view at a in fig. 4a shown in fig. 4b, the stator winding 1 comprises a plurality of spaced apart wire insertion sections 110 in the radial direction of the stator 10 shown by the arrows in fig. 4b, which plurality of spaced apart wire insertion sections 110 are to be accommodated in the same winding slot R. In the radial direction of the stator 1, a plurality of insert segments 110 in the same winding slot R are stacked, one layer near the outer peripheral surface of the stator 10 is a first layer, one layer near the axial center of the stator 10 is an nth layer, and n is an even number of 4 or more. Illustratively, the flat wire motor 100 is a 6-pole 54-slot motor with 6-layer wire segments stacked within each winding slot R. The layers where the 6 wire insertion sections are located are a first layer L1, a second layer L2, a third layer L3, a fourth layer L4, a fifth layer L5, and a sixth layer L6, respectively, from the outer circumferential surface of the stator 10 toward the axial center of the stator 10 in the radial direction of the stator 10. The first layer L1 is the innermost layer near the slot bottom, and the sixth layer L6 is the outermost layer near the slot opening, with reference to the structure of the winding slot R.

The stator winding 1 includes a plurality of continuous wave wound flat wires 11 as shown in fig. 4c, and the plurality of flat wires 11 are wound according to a certain arrangement rule to obtain the stator winding 1 shown in fig. 4 a. As shown in fig. 4c, each flat wire 11 is formed by bending a conductive wire, and specifically includes a plurality of plug wire segments 110, a plurality of first span segments 111, and a plurality of second span segments 112. The insert segment 110 is linear, and its length direction is parallel to the axial direction of the stator 10. When the flat wire 11 is wound around the stator core 2, each of the plug segments 110 is inserted into one of the winding slots R of the stator core 2. As shown in fig. 4a and 4b, a plurality of plug segments 110 can be accommodated in each winding slot R of the stator core 2. In the same winding slot R, a plurality of wire segments 110 are stacked in order in the radial direction of the stator 10, and the stacking direction is also the thickness direction of the wire segments 110. Each first span 111 is connected to a second span 112 by a plug 110, the first span 111 exposing the first end a1 of the stator core 2 and the second span 112 exposing the second end a2 of the stator core 2. The flat wire 11 has a first lead-out section 113 and a second lead-out section 114 at both ends, respectively, the first lead-out section 113 and the second lead-out section 114 being for connecting the above-mentioned bus structure 3. The first lead-out section 113 may be regarded as a head of the flat wire 11, the second lead-out section 114 may be regarded as a tail of the flat wire 11, and the plurality of plug-in sections 110, the plurality of first span sections 111, and the plurality of second span sections 112 are distributed between the first lead-out section 113 and the second lead-out section 114. It should be understood that in fig. 4a to 4c, only the plug-in segment 110, the first span segment 111, the second span segment 112, the first lead-out segment 113 and the second lead-out segment 114 of the flat wire 11 are shown, but are not limited to being directly connected between any two connected segments, that is, other connection structures may be provided between any two connected segments. The plug-in segment 110, the first span segment 111, the second span segment 112, the first lead-out segment 113 and the second lead-out segment 114 are only provided for more convenience in describing the concept and definition of the winding shape of the flat wire 11 with respect to the stator core 2.

The stator winding 1 of the stator 10 provided by the embodiment of the application is formed by winding a plurality of flat wires 11, two ends of each flat wire 11 are the wiring terminals of the stator winding 1, a large number of welding points do not exist at two axial ends of the stator 10, the preparation process of the stator winding 1 can be simplified, the height of the end part of the stator winding 1 can be reduced, and the flat wire motor 100 is miniaturized.

To facilitate understanding of the structural relationship of the flat wire 11 and the stator core 2, the approximate positions of the first end face a1 and the second end face a2 of the stator core 2 are illustrated with broken lines in fig. 4 c. As shown in fig. 4c, the first span 111 is located on the first end surface a1 side, and each second span 112 is located on the second end surface a2 side. The first lead-out section 113 and the second lead-out section 114 of the flat wire 11 are located on the first end face a1 side. The first lead-out section 113 and the second lead-out section 114 are used for externally connecting a circuit for the flat wire 11, and the first lead-out section 113 and the second lead-out section 114 are positioned on the same side of the stator core 2 in the axial direction, so that the wiring of the stator winding 1 is facilitated.

With further reference to the structure of the flat wire 11 shown in fig. 4d, the pitch of the first span 111 is y1 and the pitch of the second span 112 is y2 along the circumferential direction of the stator 10. Specifically, the pitch y1 of the first span 111 is the distance between two wire segments 110 connected to two ends of the first span 111, and the pitch y2 of the second span 112 is the distance between two wire segments 110 connected to two ends of the second span 112. The sum of the pitch y1 of each first span 111 and the pitch y2 of each second span 112 is equal to the number of winding slots R divided by the pole pair number of the stator winding 1. For the flat wire motor 100, the number of winding slots R is z and the pole pair number is p, y1+y2=z/(2 p). When the stator winding 1 is a wave-wound full-distance winding, y1=y2=z/(2 p). When the stator winding 1 is a wave-wound short distance winding, y1+.y2. In one possible implementation form, y1 < y2, y1=z1/(2p) -x, y2=z1/(2p) +x. In another possible implementation form, y2 < y1, y1=z1/(2p) +x, y2=z1/(2p) -x. Wherein x is a natural number, and x is more than or equal to 1 and less than z 1/(2 p). The stator winding 1 can realize the whole-pitch winding through one pitch, can realize the short-pitch winding through two pitches, is favorable for simplifying the winding process and is convenient for automatic production.

Fig. 5a shows a structure in which a flat wire 11 is wound around the stator core 2, fig. 5b illustrates a schematic view of the structure as viewed in the radial direction of the stator 10, fig. 5c illustrates a schematic view of the structure as viewed along the first end face a1 side of the stator 10, and fig. 5d illustrates a schematic view of the structure as viewed along the first end face a2 side of the stator 10.

Referring to fig. 5a and 5b together, the flat wire 11 may be wound from the first lead-out section 113 from the first end face a1 of the stator core 2, the second lead-out section 114 from the first end face a1 to the second end face a2 side after passing through the first winding slot R, then from the second end face a2 to the first end face a1 after passing through the other winding slot R after crossing the plurality of winding slots R in the second end face a2 along the circumferential direction of the stator 10, then from the first end face a1 to the second end face a2 after passing through the other winding slot R after crossing the plurality of winding slots R in the first end face a1 along the circumferential direction of the stator 10, and finally the second lead-out section 114 is protruded from the first winding slot R to the first end face a1 according to a certain rule, resulting in the structure shown in fig. 5 a. The segment of the flat wire 11 that spans the plurality of winding grooves R at the first end face a1 is a first span segment 111, the segment of the flat wire 11 that spans the plurality of winding grooves R at the second end face a2 in the circumferential direction of the stator 10 is a second span segment 112, and the segment of the flat wire 11 that is accommodated in the winding groove R is a straight segment 110. The first lead-out section 113 and the second lead-out section 114 are located in the same winding slot R.

Referring to fig. 5a and 5c together, the plurality of first cross-segments 111 may be divided into a plurality of groups on the first end surface a1 side of the stator core 2, the plurality of groups of first cross-segments 111 being distributed at intervals along the circumferential direction of the stator 10, and the plurality of first cross-segments 111 in the same group being arranged along the radial direction of the stator 10. The first crossover segment 111 in the same group does not have a crossover between two segments in the radial direction of the stator 10, enabling a reduction in the end height of the stator winding 1 and a reduction in the complexity of winding. Illustratively, the first span 111 is a first span Q1, and three spans Q1 are distributed along the circumferential direction of the stator 10 at the first end face a 1. Each first crossover group Q1 includes a plurality of first crossover segments 111, and the plurality of first crossover segments 111 are arranged along the radial direction of the stator 10. Along the circumference of the stator 10, the first span section 111 includes two first extension sections 1111 and a first fold section 1112 connected between the two first extension sections 1111, where the first fold section 1112 is disposed at an included angle with the radial direction of the stator 10, so that the distances between the two first extension sections 1111 and the axial center O of the stator 10 are different, and span of the first span section 111 along the radial direction of the stator 10 is realized. As shown in fig. 5c, in the same first line-crossing segment 111, a first line-folding segment 1112 is used as a boundary, wherein a distance between the first extension 1111 along the radial direction of the stator 10 and the axial center O of the stator 10 is h11, a distance between the other first extension 1111 along the radial direction of the stator 10 and the axial center O of the stator 10 is h12, and h11+' h12, so that distances between two line-inserting segments 110 connected to two ends of the first line-crossing segment 111 and the axial center O of the stator 10 are not equal. Specifically, the difference in distance between the two first extension sections 1111 and the axial center O of the stator 10 in the radial direction of the stator 10 is not smaller than the thickness of the flat wire 11, so that the number of layers of the two plug wire sections 110 to which the two first extension sections 1111 are connected can differ by 1 in the winding slot R. Among the plurality of first span segments 111 in the same group, the plug segment 110 connected to one end of each first span segment 111 is received in one winding slot R, and the plug segment 110 connected to the other end of each first span segment 111 is received in the other winding slot R. That is, the plug wire segments 110 connected to two ends of each first span segment 111 are respectively located in two winding slots R, the plug wire segments 110 connected to one end of each of the plurality of first span segments 111 in the same group are located in the same winding slot R, and the plug wire segments 110 connected to the other end of each of the plurality of first span segments 111 in the same group are located in the same winding slot R. The pitch of the plurality of insert segments 110 of the same flat wire 11 distributed along the circumferential direction of the stator 10 is the pitch y1 of the first span segment 111 or the pitch y2 of the second span segment 112.

In one of the first bridge groups Q1, there are two first bridge segments 111, and the first lead-out segment 113 and the second lead-out segment 114 are respectively arranged at intervals from the two first bridge segments 111 along the radial direction of the stator 10. As shown in fig. 5c, the first lead-out section 113 is arranged on the side of the two first span sections 111 facing the outer peripheral surface of the stator 10, and the second lead-out section 114 is arranged on the side of the two first span sections 111 facing the axial center O of the stator 10. It is considered that the first lead-out section 113 and the second lead-out section 114 are arranged at an interval relative to each other in the radial direction of the stator 10, and the plurality of first span sections 111 are arranged between the first lead-out section 113 and the second lead-out section 114 at intervals, so that the first span sections 111 between the first lead-out section 113 and the second lead-out section 114 can be conveniently routed across slots. In the radial direction of the stator 10, the first lead-out section 113 corresponds to a portion of the two first span sections 111 closer to the axial center of the stator 10, and the second lead-out section 114 corresponds to a portion of the two first span sections 111 closer to the outer peripheral surface of the stator 10. The number of layers in each winding slot R is the same, and the first lead-out section 113 and the second lead-out section 114 do not increase the radial dimension of the stator winding 1 in this area.

Referring to fig. 5a and 5d together, the plurality of second span segments 112 may be divided into a plurality of groups on the second end surface a1 side of the stator core 2, the plurality of groups of second span segments 112 being distributed at intervals along the circumferential direction of the stator 10, and the plurality of second span segments 112 in the same group being arranged along the radial direction of the stator 10. The second crossover segment 112 within the same group has no crossover between the two segments, which can reduce the end height of the stator winding 1 and reduce the complexity of winding. Illustratively, one set of second span segments 112 is a second span set Q2, and three second span sets Q2 are distributed along the circumferential direction of the stator 10 at the second end face a 2. Each second crossover group Q2 includes a plurality of second crossover segments 112 therein, and the plurality of second crossover segments 112 are arranged in the radial direction of the stator 10. Along the circumferential direction of the stator 10, the second span segment 112 includes two second extension segments 1121 and a second folded segment 1122 connected between the two second extension segments 1121, where the second folded segment 1122 is disposed at an included angle with the radial direction of the stator 10, so that the distances between the two second extension segments 1121 and the axis O of the stator 10 are different, and span of the second span segment 112 along the radial direction of the stator 10 is realized. As shown in fig. 5d, in the same second line-span segment 112, a distance between one second line-fold segment 1122 along the radial direction of the stator 10 and the axial center O of the stator 10 is h21, and a distance between the other second line-fold segment 1122 along the radial direction of the stator 10 and the axial center O of the stator 10 is h22, where h21+.h22, so that the distances between the two line-fold segments 110 connected to the two ends of the second line-span segment 112 and the axial center O of the stator 10 are not equal. Specifically, the difference in distance between the two second extension sections 1121 and the axis O of the stator 10 in the radial direction of the stator is not smaller than the thickness of the flat wire 11, so that the number of layers of the two insert wire sections 110 to which the two second extension sections 112 are connected can differ by 1 in the winding slot R. Among the plurality of second span segments 112 in the same group, the plug segment 110 connected to one end of each second span segment 112 is accommodated in one winding slot R, and the plug segment 110 connected to the other end of each second span segment 112 is accommodated in the other winding slot R. That is, the plurality of second crossover segments 112 in the same group, the two winding slots R bridged in the circumferential direction of the stator 10 are the same two winding slots R.

In the stator 10 provided in the embodiment of the present application, the number of layers of the two plug wire segments 110 connected by each second span segment 112 in the winding slot R differs by 1. Along the radial direction of the stator 10, the first span line section 111 and the second span line section 112 are of a one-layer-crossing structure, so that winding cross layers can be reduced, and the influence of the cross layers on the height of the end part of the stator winding 1 and the complexity of wiring can be reduced. Specifically, one of the plug segments 110 connected to the first lead-out segment 113 is arranged at the innermost side of the winding slot R, and the other plug segment 110 connected to the second lead-out segment 114 is arranged at the outermost side of the other winding slot R in the radial direction of the stator 10. For the same flat wire 11, along the radial direction of the stator 10, the first lead-out section 113 is located at the outermost side of the flat wire 111, and the second lead-out section is located at the outermost side of the flat wire, so that the first cross-line section is convenient to run across the slot.

The flat wire motor 100 provided in the embodiment of the present application is an exemplary 6-pole 54-slot motor, fig. 6a shows a schematic winding diagram of one flat wire 11 on the stator core 2, and fig. 6b shows a schematic partial winding diagram shown by a dashed box in fig. 6 a. The first span 111 of the flat wire 11 spans y1 winding slots R and the second span 112 of the flat wire 11 spans y2 winding slots R. Illustratively, y1=y2=9, and the stator winding 1 is a continuous wave full-length winding.

The winding method of one flat wire 11 will be exemplarily described with reference to the above-described structures of fig. 5a to 5d and winding schemes shown in fig. 6a and 6 b. At the time of winding, the flat wire 11 is placed at the first end face a1 of the stator core 2, and the first end face a1 of the stator core 2 may be regarded as a starting end. Winding starts from the start end and passes through the stator core 2 from the 1 st winding slot R, which is the winding slot 18 in fig. 6b, through the first layer to the second end face a 2. The flat wire 11 passes through the stator core 2 from the second layer of the 2 nd winding slot R to the first end face a1 after the second end face a2 of the stator core 2 crosses over y2 winding slots R, which are the winding slots 27 in fig. 6 b. The flat wire 11 then passes through the stator core 2 from the first layer of the 3 rd winding slot R to the second end face a2 after crossing the y1 th winding slot R, which 3 rd winding slot R is the winding slot 36, derived from fig. 6 b. To this end, the flat wire 11 bypasses y1+y2 winding slots R. The flat wire 11 continues to pass through the stator core 2 from the second layer of the 4 th winding slot R to the first end face a1 after the second end face a2 of the stator core 2 crosses over y2 winding slots R, which 4 th winding slot R is a winding slot 45, derived from fig. 6 b. The flat wire 11 then passes through the stator core 2 from the third layer of the 5 th winding slot R to the second end face a2 after crossing the y1 th winding slot R, which 5 th winding slot R is the winding slot 54, derived from fig. 6 b. The flat wire 11 continues to pass through the stator core 2 from the second layer of the 6 th winding slot R to the first end face a1 after the second end face a2 of the stator core 2 crosses over y2 winding slots R, which 6 th winding slot R is derived from fig. 6b as winding slot 9. When the flat wire 11 passes through the y1 st winding slot R from the 6 th winding slot R to the 1 st winding slot R, the flat wire 11 is wound around one turn in the circumferential direction of the stator 10.

The flat wire 11 continues to pass through the stator core 2 from the third layer of the 1 st winding slot R to the second end face a2 across the y1 th winding slot R at the first end face a1, then passes through the stator core 2 from the fourth layer of the 2 nd winding slot R to the first end face a1 across the y2 slots, then passes through the stator core 2 from the third layer of the 3 rd winding slot R to the second end face a2 across the y1 winding slot R, then passes through the stator core 2 from the fourth layer of the 4 th winding slot R to the first end face a1 across the y2 slots, then passes through the stator core 2 from the third layer of the 5 th winding slot R to the second end face a2 across the y1 winding slot R, and passes through the stator core 2 from the fourth layer of the 6 th winding slot R to the first end face a1 across the y2 slots. At this time, the flat wire 11 bypasses two turns in the circumferential direction of the stator 10. Next, the flat wire 11 continues to pass through the stator core 2 from the fifth layer of the 1 st winding slot R to the second end face a2 across the y1 st winding slot R at the first end face a1, then passes through the stator core 2 from the sixth layer of the 2 nd winding slot R to the first end face a1 across the y2 slots, then passes through the stator core 2 from the fifth layer of the 3 rd winding slot R to the second end face a2 across the y1 th winding slot R, then passes through the stator core 2 from the sixth layer of the 4 th winding slot R to the first end face a1 across the y2 slots, then passes through the stator core 2 from the fifth layer of the 5 th winding slot R to the second end face a2 across the y1 winding slot R, and passes through the stator core 2 from the sixth layer of the 6 th winding slot R to the first end face a1 across the y2 slots. To this end, a continuous wave wound flat wire 11 is wound, and the structure of the flat wire 11 and the stator core 2 can be described with reference to fig. 5a to 5 d.

The stator winding 1 provided in the embodiment of the present application includes a multi-phase winding, each phase winding including two wire groups, each wire group including a plurality of the flat wires 11 described above. Taking a phase winding as an example, each wire set of the phase winding includes three flat wires 11. The flat wires 11 in one of the wire groups are offset from the flat wires 11 in the other wire group in the circumferential direction of the stator 10 such that the electrical angles of the two wire groups differ by 180 deg., and the spatial angles of the two wire groups differ by 180 deg./p. Wherein the first span 111 and the second span 112 in one wire set are symmetrical with the first span 111 and the second span 112 in the other wire set along the axial center of the stator 10. It can be considered that, except for the first lead-out section 113 and the second lead-out section 114, two wire groups in the same phase winding are symmetrical along the axial center of the stator 10.

Taking a 6-pole 54-slot flat wire motor 100 as an example, fig. 7a shows the structure of two wire groups in the same phase winding, and fig. 7b shows a schematic diagram of the winding of two wire groups in the same phase winding. One of the wire sets includes three flat wires 11a, and the other wire set includes three flat wires 11b.

Referring to fig. 7a and 7b together, the plurality of flat wires 11a in one wire group and the plurality of flat wires 11b in the other wire group are arranged in a staggered manner in the circumferential direction of the stator 10. The wire insertion sections 110a in one wire group and the wire insertion sections 110b in the other wire group are arranged at intervals in the circumferential direction of the stator 10, the first wire crossover section 111a in one wire group and the first wire crossover section 111b in the other wire group are arranged at intervals in the circumferential direction of the stator 10, the second wire crossover section 112a in one wire group and the second wire crossover section 112b in the other wire group are arranged at intervals in the circumferential direction of the stator 10, the first lead-out section 113a in one wire group and the first lead-out section 113b in the other wire group are arranged at intervals in the circumferential direction of the stator 10, and the second lead-out section 114a in the one wire group and the second lead-out section 114b in the other wire group are arranged at intervals in the circumferential direction of the stator 10. As shown in fig. 7b, each phase winding includes two wire groups, each wire group includes three flat wires 11, and the three flat wires 11 are adjacent to each other in every two slots along the circumferential direction of the stator 10, so that the partial flat wires 11 are wound and connected conveniently.

In the same wire group, the slots between two adjacent flat wires 11 are adjacent along the circumferential direction of the stator 10, so that the slots of winding slots R where the plug wire segments 110 of the two adjacent flat wires 11 are located are adjacent. In the same wire group, a slot is formed between the first lead-out sections 113 of any two adjacent flat wires 11 along the circumferential direction of the stator 10, and a slot is formed between the second lead-out sections 114 of any two adjacent flat wires 11. The first lead-out sections 113 and the second lead-out sections 114 of the same wire group can be arranged at intervals along the circumferential direction of the stator 10, and the first lead-out sections 113 and the second lead-out sections 114 of the flat wires 11 of the same wire group can be distributed in a concentrated manner along the circumferential direction of the stator 10, so that the stator winding 1 is convenient to converge.

For the whole stator winding 1, the first lead-out sections 113 of all the flat wires 11 are arranged at intervals along the circumferential direction of the stator 10, and a slot position of a winding slot R is arranged between any two adjacent first lead-out sections 113. The second lead-out sections 114 of all the flat wires 11 are arranged at intervals along the circumferential direction of the stator 10, and a slot position of one winding slot R is arranged between any two adjacent second lead-out sections 114. All the first lead-out sections 113 and all the second lead-out sections 114 are adjacently arranged along the circumferential direction of the stator 10, and all the first lead-out sections 113 and the second lead-out sections 114 of the stator winding 1 can be intensively distributed along the circumferential direction of the stator 10, so that the bus structure 3 is convenient for bus connection.

Fig. 7c shows a portion of the windings within the dashed box in fig. 7 b. As shown in fig. 7c, the first span section 111a of the flat wire 11a is opposite to the second span section 112b of the flat wire 11b in the axial direction of the stator 10, and the second span section 111b of the flat wire 11a is opposite to the first span section 111b of the flat wire 11b in the axial direction of the stator 10. In the same flat wire 11a, three wire insertion sections 110a are located in the same winding slot R, and three wire insertion sections 110b belonging to the same flat wire 11b are also arranged in the winding slot R. That is, within one winding slot R, three plug wire segments 110a and three plug wire segments 110b are arranged.

Illustratively, the stator winding 1 comprises three-phase windings, a U-phase winding, a W-phase winding and a V-phase winding, respectively. The structure of each phase winding is shown in fig. 7a, and the winding manner of each phase winding is shown in fig. 7b and 7 c. The motor 100 is a 6-pole 54-slot full-pitch three-phase motor, and adopts a slot 6-layer winding arrangement, and the winding mode of the stator winding 1 can refer to the winding mode shown in fig. 8a, wherein any two adjacent windings are adjacent along the circumferential direction of the stator 10. Specifically, with reference to the U-phase winding, the W-phase winding is deflected by 60 °/p in the circumferential direction of the stator 10 with respect to the U-phase winding, and the V-phase winding is deflected by 120 °/p in the circumferential direction of the stator 10 with respect to the U-phase winding.

Fig. 8b shows a schematic view of a portion of the windings within the dashed box in fig. 8 a. Referring also to fig. 8a and 8b, each phase winding comprises two wire sets, each wire set comprising three flat wires 11, each flat wire 11 having a first lead-out section 113 and a second lead-out section 114 at each end. Specifically, the U-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are U1in and U1out, U2in and U2out, U3in and U3out, U4in and U4out, U5in and U5out, and U6in and U6out, respectively. The W-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are W1in and W1out, W2in and W2out, W3in and W3out, W4in and W4out, W5in and W5out, and W6in and W6out, respectively. The V-phase winding includes 6 flat wires 11, and both ends of the 6 flat wires 11 are V1in and V1out, V2in and V2out, V3in and V3out, V4in and V4out, V5in and V5out, and V6in and V6out, respectively. The entire stator winding 1 then comprises 18 first lead-out sections 113 and 18 second lead-out sections 114. As shown in fig. 8b, the wire insertion sections 110 of the two flat wires 11 in phase are accommodated in each winding slot R, and a total of 6 wire insertion sections 110 are accommodated. When the stator winding 1 is wound in the winding manner shown in fig. 8b, all the first lead-out sections 113 of the stator winding 1 are adjacently distributed along the circumferential direction of the stator 10, and all the second lead-out sections 114 are adjacently distributed along the circumferential direction of the stator 10, so that the connection of the bus structure 3 is facilitated.

As shown in fig. 9a, in some embodiments, the first span 111 of the flat wire 11 spans y1 winding slots R, the second span 112 of the flat wire 11 spans y2 winding slots R, y1+notey2, and the stator winding 1 is a continuous wave short distance winding. Fig. 9b shows a partially wound schematic view shown in dashed box in fig. 9 a. Illustratively, the pitch y1 of the first span 111 is 10 and the pitch y2 of the second span 112 is 8. The winding manner of the stator winding 1 is similar to that of the whole-pitch winding, and is not repeated here.

The stator winding 1 comprises a multi-phase winding comprising two conductor sets each comprising a plurality of the above-mentioned flat wires 11. Taking a phase winding as an example, each wire set of the phase winding includes three flat wires 11. The flat wires 11 in one of the wire groups are offset from the flat wires 11 in the other wire group in the circumferential direction of the stator 10 such that the electrical angles of the two wire groups differ by 180 deg., and the spatial angles of the two wire groups differ by 180 deg./p. Wherein the first span 111 and the second span 112 in one wire set are symmetrical with the first span 111 and the second span 112 in the other wire set along the axial center of the stator 10. It can be considered that, except for the first lead-out section 113 and the second lead-out section 114, two wire groups in the same phase winding are symmetrical along the axial center of the stator 10.

Taking a 6-pole 54-slot motor as an example, fig. 10a shows the structure of two wire sets in the same phase winding, and fig. 10b shows a schematic winding diagram of two wire sets in the same phase winding. One of the wire sets includes three flat wires 11a, and the other wire set includes three flat wires 11b.

Referring to fig. 10a and 10b together, the plurality of flat wires 11a in one wire group and the plurality of flat wires 11b in the other wire group are offset in the circumferential direction of the stator 10. The wire insertion sections 110a in one wire group and the wire insertion sections 110b in the other wire group are arranged in a staggered manner along the circumferential direction of the stator 10, and a part of the wire insertion sections 110a and a part of the wire insertion sections 110b are arranged at intervals along the radial direction of the stator 10. All first crossover segments 111a in one wire set are offset (y1+y2)/2 winding slots R from all first crossover segments 111b in the other wire set, all second crossover segments 112a in one wire set are offset (y1+y2)/2 winding slots R from all second crossover segments 112b in the other wire set, all first lead-out segments 113a in one wire set are arranged offset (y1+y2)/2 winding slots R from all first lead-out segments 113b in the other wire set, and all second lead-out segments 114a in one wire set are offset (y1+y2)/2 winding slots R from all second lead-out segments 114b in the other wire set along the circumferential direction of the stator 10.

As shown in fig. 10c, in the circumferential direction of the stator 10, a group of adjacent plug wire segments 110a of the three flat wires 11a of one wire group are distributed in three adjacent winding slots R, a group of adjacent plug wire segments 110b of the three flat wires 11b of the other wire group are distributed in three adjacent winding slots R, and the former group of plug wire segments 110a and the latter group of plug wire segments 110b occupy four adjacent winding slots R in total. Three wire inserting sections 110a are distributed in the first winding groove R, three wire inserting sections 110b are distributed in the last winding groove R, and three wire inserting sections 110a and three wire inserting sections 110b are distributed in each of the middle two winding grooves R.

In the same wire group, the slots between two adjacent flat wires 11 are adjacent along the circumferential direction of the stator 10, the first lead-out sections 113 of the two adjacent flat wires 11 are separated by a pitch y1 of a first span section 111, and the second lead-out sections 114 of the two adjacent flat wires 11 are separated by a pitch y1 of a first span section 111. In the same wire group, a groove is formed between the first lead-out sections 113 of any two adjacent flat wires 11 in the circumferential direction of the stator 10, and a groove is formed between the second lead-out sections 114 of any two adjacent flat wires 11.

Illustratively, the stator winding 1 comprises three-phase windings, a U-phase winding, a W-phase winding and a V-phase winding, respectively. The structure of each phase winding is shown in fig. 10a, and the winding manner of each phase winding is shown in fig. 10b and 10 c. The motor 100 is a three-phase motor with 6 poles and 54 slots, and adopts a winding arrangement of one slot and 6 layers, and the winding mode of the stator winding 1 can be shown in fig. 11a, and any two adjacent windings are adjacent along the circumferential direction of the stator 10. Specifically, with reference to the U-phase winding, the W-phase winding is deflected by 60 °/p in the circumferential direction of the stator 10 with respect to the U-phase winding, and the V-phase winding is deflected by 120 °/p in the circumferential direction of the stator 10 with respect to the U-phase winding.

Fig. 11b shows a schematic view of a portion of the windings within the dashed box in fig. 11 a. Referring also to fig. 11a and 11b, each phase winding comprises two wire sets, each wire set comprising three flat wires 11, each flat wire 11 comprising a first lead-out section 113 and a second lead-out section 114. The entire stator winding 1 then comprises 18 lead-in terminals and 18 lead-out terminals. The lead-in end corresponds to the first lead-out section 113, and the lead-out end corresponds to the second lead-out section 114. As shown in fig. 8b, two flat wires 11 of the same phase are accommodated in each winding slot R, and a total of 6 wire insertion sections are accommodated. When the stator winding 1 is wound in the winding manner shown in fig. 11b, all the first lead-out sections 113 of the stator winding 1 are adjacently distributed along the circumferential direction of the stator 10, all the second lead-out sections 114 are adjacently distributed along the circumferential direction of the stator 10, and all the first lead-out sections 113 and all the second lead-out sections 114 are alternately distributed along the circumferential direction of the stator 10, so that the bus structure 3 is conveniently connected with the first lead-out sections 113 and the second lead-out sections 114.

The above embodiment illustrates a winding mode of 6-pole 54 slots and 6 layers per slot, and the stator winding 1 in the continuous wave winding mode provided in the embodiment of the application can be applied to various types of motors.

In some embodiments, taking a 6-pole 54-slot, 8-layer-per-slot full-pitch three-phase motor as an example, the winding manner of the stator winding 1 can be as shown in fig. 12a, and any two adjacent windings are adjacent to each other along the circumferential direction of the stator 10. Specifically, with reference to the U-phase winding, the W-phase winding is deflected by 60 °/p in the circumferential direction of the stator 10 with respect to the U-phase winding, and the V-phase winding is deflected by 120 °/p in the circumferential direction of the stator 10 with respect to the U-phase winding. Each phase winding comprises two wire groups, each wire group comprises three flat wires 11, and the three flat wires 11 are adjacent to each other in a slot position along the circumferential direction of the stator 10. The flat wires 11 in one of the wire groups are offset from the flat wires 11 in the other wire group in the circumferential direction of the stator 10 such that the electrical angles of the two wire groups differ by 180 deg., and the spatial angles of the two wire groups differ by 180 deg./p. In the same wire group, the slots between two adjacent flat wires 11 are adjacent along the circumferential direction of the stator 10, the first lead-out sections 113 of the two adjacent flat wires 11 are separated by a pitch y1 of a first span section 111, and the second lead-out sections 114 of the two adjacent flat wires 11 are separated by a pitch y1 of a first span section 111. In the same wire group, a groove is formed between the first lead-out sections 113 of any two adjacent flat wires 11 in the circumferential direction of the stator 10, and a groove is formed between the second lead-out sections 114 of any two adjacent flat wires 11.

With continued reference to fig. 12b, in the same flat wire 11, there are four plug-in segments 110 located in the same winding slot R, and four plug-in segments 110 belonging to another flat wire 11 are also arranged in the winding slot R. That is, within one winding slot R, eight plug segments 110 are arranged, wherein four plug segments 110 belong to the same flat wire 11, and the other four plug segments 110 belong to another flat wire 11.

Each phase winding comprises two wire sets, each wire set comprising three flat wires 11, each flat wire 11 comprising a first lead-out section 113 and a second lead-out section 114. Specifically, the U-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are U1in and U1out, U2in and U2out, U3in and U3out, U4in and U4out, U5in and U5out, and U6in and U6out, respectively. The W-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are W1in and W1out, W2in and W2out, W3in and W3out, W4in and W4out, W5in and W5out, and W6in and W6out, respectively. The V-phase winding includes 6 flat wires 11, and both ends of the 6 flat wires 11 are V1in and V1out, V2in and V2out, V3in and V3out, V4in and V4out, V5in and V5out, and V6in and V6out, respectively. The entire stator winding 1 then comprises 18 first lead-out sections 113 and 18 second lead-out sections 114. As shown in fig. 12b, a total of 8 plug-in sections 110 of two flat wires 11 in phase are accommodated in each winding slot R.

An exemplary manner of winding a flat wire 11 is described with reference to fig. 12a and 12 b. At the time of winding, the flat wire 11 is placed at the first end face a1 of the stator core 2, and the first end face a1 of the stator core 2 may be regarded as a starting end. Starting winding from the starting end, a first layer of the 1 st winding slot R passes through the stator core 2 to the second end face a2, a second layer of the 2 nd winding slot R passes through the stator core 2 to the first end face a1 after crossing y2 winding slots R, then a first layer of the 3 rd winding slot R passes through the stator core 2 to the second end face a2 and … … after crossing y1 winding slots R, and a second layer of the 2 nd winding slot R passes through the stator core 2 to the first end face a1 after crossing y2 winding slots R. Then, the y 1-th winding slot R is crossed from the third layer of the 1 st winding slot R to the second end face a2, the y 2-th winding slot R is crossed from the fourth layer of the 2 nd winding slot R to the first end face a1, the y 1-th winding slot R is crossed from the third layer of the 3 rd winding slot R to the second end face a2, … …, and the y 2-th winding slot R is crossed from the fourth layer of the 2 p-th winding slot R to the first end face a1, and the stator core 2 is crossed from the fourth layer of the 2 p-th winding slot R. … …, until the layer 8 of the 2 nd winding slot R passes through the stator core 2 to the first end face a1 after crossing the y2 winding slots R. Wherein p is 3. Thus, the flat wire 11 wound by continuous wave is wound, the first lead-out section 113 and the second lead-out section 114 of the flat wire 11 are positioned in the same winding slot R, the first lead-out section 113 is positioned at the slot bottom, namely the first layer, the second lead-out section 114 is positioned at the slot opening, namely the nth layer, and n is 8.

In some embodiments, taking an 8-pole 48-slot, 6-layer-per-slot full-pitch three-phase motor as an example, the winding manner of the stator winding 1 may be as shown in fig. 13a, and any two adjacent windings are adjacent to each other along the circumferential direction of the stator 10. Specifically, with reference to the U-phase winding, the W-phase winding is deflected by 60 °/p in the circumferential direction of the stator 10 with respect to the U-phase winding, and the V-phase winding is deflected by 120 °/p in the circumferential direction of the stator 10 with respect to the U-phase winding. Each phase winding comprises two conductor sets, each conductor set comprising two flat wires 11, the two flat wires 11 being adjacent along the circumferential slot of the stator 10. The flat wires 11 in one of the wire groups are offset from the flat wires 11 in the other wire group in the circumferential direction of the stator 10 such that the electrical angles of the two wire groups differ by 180 deg., and the spatial angles of the two wire groups differ by 180 deg./p. In the same wire group, along the circumferential direction of the stator 10, the slot between two flat wires 11 is located, the pitch y1 of a first span 111 is spaced between the first lead-out sections 113 of two flat wires 11, and the pitch y1 of a first span 111 is spaced between the second lead-out sections 114 of two adjacent flat wires 11. In the same wire group, a groove is formed between the first lead-out sections 113 of the two flat wires 11 in the circumferential direction of the stator 10, and a groove is formed between the second lead-out sections 114 of the two flat wires 11.

With continued reference to fig. 13b, in the same flat wire 11, there are three plug-in segments 110 located in the same winding slot R, and three plug-in segments 110 belonging to another flat wire 11 are also arranged in the winding slot R. That is, six plug-in segments 110 are arranged in one winding slot R, wherein three plug-in segments 110 belong to the same flat wire 11 and the other three plug-in segments 110 belong to another flat wire 11.

Each phase winding comprises two wire sets, each wire set comprising two flat wires 11, each flat wire 11 comprising a first lead-out section 113 and a second lead-out section 114. Specifically, the U-phase winding includes 4 flat wires 11, and two ends of the 4 flat wires 11 are U1in and U1out, U2in and U2out, U3in and U3out, and U4in and U4out, respectively. The W-phase winding includes 4 flat wires 11, and both ends of the 4 flat wires 11 are W1in and W1out, W2in and W2out, W3in and W3out, W4in and W4out, respectively. The entire stator winding 1 then comprises 12 first lead-out sections 113 and 12 second lead-out sections 114. As shown in fig. 13b, two flat wires 11 of the same phase and a total of 6 plug-in wire segments 110 are accommodated in each winding slot R.

An exemplary manner of winding a flat wire 11 is described with reference to fig. 13a and 13 b. At the time of winding, the flat wire 11 is placed at the first end face a1 of the stator core 2, and the first end face a1 of the stator core 2 may be regarded as a starting end. Starting winding from the starting end, the first layer of the 1 st winding slot R passes through the stator core to the second end face a2, the second layer of the 2 nd winding slot R passes through the stator core 2 to the first end face a1 after crossing y2 slots, then the first layer of the 3 rd winding slot R passes through the stator core 2 to the second end face a2 and … … after crossing y1 winding slot R, and the second layer of the 2p nd winding slot R passes through the stator core 2 to the first end face a1 after crossing y2 slots. Then, the y 1-th winding slot R is crossed from the third layer of the 1 st winding slot R to the second end face a2, the winding slot R is crossed from the fourth layer of the 2 nd winding slot R to the first end face a1 through the stator core 2, then the y 1-th slot is crossed from the third layer of the 3 rd winding slot R to the second end face a2, … …, and the y 2-th winding slot R is crossed from the fourth layer of the 2 p-th winding slot R to the first end face a1 through the stator core 2. … …, until the y2 winding slots R are spanned, passes through the stator core 2 from the 6 th layer of the 2 nd winding slot R to the first end face a1. Wherein p is 4. Thus, the flat wire 11 wound by continuous wave is wound, the first lead-out section 113 and the second lead-out section 114 of the flat wire 11 are positioned in the same winding slot R, the first lead-out section 113 is positioned at the slot bottom, namely the first layer, the second lead-out section 114 is positioned at the slot opening, namely the nth layer, and n is 6.

In some embodiments, taking an 8-pole 72-slot, 6-layer-per-slot full-pitch three-phase motor as an example, the winding manner of the stator winding 1 may refer to fig. 14a, where any two adjacent windings are adjacent along the circumferential direction of the stator 10. Specifically, with reference to the U-phase winding, the W-phase winding is deflected by 60 °/p in the circumferential direction of the stator 10 with respect to the U-phase winding, and the V-phase winding is deflected by 120 °/p in the circumferential direction of the stator 10 with respect to the U-phase winding. Each phase winding comprises two conductor sets, each conductor set comprising three flat wires 11, the three flat wires 11 being adjacent along the circumferential slot of the stator 10. The flat wires 11 in one of the wire groups are offset from the flat wires 11 in the other wire group in the circumferential direction of the stator 10 such that the electrical angles of the two wire groups differ by 180 deg., and the spatial angles of the two wire groups differ by 180 deg./p. In the same wire group, along the circumferential direction of the stator 10, the slots between any two adjacent flat wires 11 are adjacent, the first lead-out sections 113 of any two adjacent flat wires 11 are separated by a pitch y1 of a first span section 111, and the second lead-out sections 114 of any two adjacent flat wires 11 are separated by a pitch y1 of a first span section 111. In the same wire group, a groove is formed between the first lead-out sections 113 of any two adjacent flat wires 11 in the circumferential direction of the stator 10, and a groove is formed between the second lead-out sections 114 of any two adjacent flat wires 11.

With continued reference to fig. 14b, in the same flat wire 11, there are three plug-in segments 110 located in the same winding slot R, and three plug-in segments 110 belonging to another flat wire 11 are also arranged in the winding slot R. That is, in one winding slot R, six plug-in segments 110 are arranged, wherein three plug-in segments 110 belong to the same flat wire 11, and the other three plug-in segments 110 belong to another flat wire 11, and the two flat wires 11 belong to the same phase.

Each phase winding comprises two wire sets, each wire set comprising two flat wires 11, each flat wire 11 comprising a first lead-out section 113 and a second lead-out section 114. Specifically, the U-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are U1in and U1out, U2in and U2out, U3in and U3out, U4in and U4out, U5in and U5out, and U6in and U6out, respectively. The W-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are W1in and W1out, W2in and W2out, W3in and W3out, W4in and W4out, W5in and W5out, and W6in and W6out, respectively. The V-phase winding includes 6 flat wires 11, and both ends of the 6 flat wires 11 are V1in and V1out, V2in and V2out, V3in and V3out, V4in and V4out, V5in and V5out, and V6in and V6out, respectively. The entire stator winding 1 then comprises 18 first lead-out sections 113 and 18 second lead-out sections 114. As shown in fig. 8b, the wire insertion sections 110 of the two flat wires 11 in phase are accommodated in each winding slot R, and a total of 6 wire insertion sections 110 are accommodated. As shown in fig. 14b, two flat wires 11 of the same phase and a total of 6 plug-in wire segments are accommodated in each winding slot R.

An exemplary manner of winding a flat wire 11 is described with reference to fig. 14a and 14 b. At the time of winding, the flat wire 11 is placed at the first end face a1 of the stator core 2, and the first end face a1 of the stator core 2 may be regarded as a starting end. Starting winding from the starting end, the first layer of the 1 st winding slot R passes through the stator core 2 to the second end face a2, the second layer of the 2 nd winding slot R passes through the stator core 2 to the first end face a1 after crossing y2 winding slots R, then the first layer of the 3 rd winding slot R passes through the stator core 2 to the second end face a2 and … … after crossing y1 winding slots R, and the second layer of the 8 th winding slot R passes through the stator core 2 to the first end face a1 after crossing y2 winding slots R. Then, the y1 winding slots R are crossed from the third layer of the first winding slot R to the second end face a2, the y2 winding slots R are crossed from the fourth layer of the 2 nd winding slot R to the first end face a1, then the y1 winding slots R are crossed from the third layer of the 3 rd winding slot R to the second end face a2, … …, and the y2 winding slots R are crossed from the fourth layer of the 2 p-th winding slot R to the first end face through the stator core 2. … …, until the n-th layer (embodiment: 6) of the 2 nd winding slot R passes through the stator core 2 to the first end face after crossing the y2 winding slots R. Wherein p is 4. Thus, the flat wire 11 wound by continuous wave is wound, the first lead-out section 113 and the second lead-out section 114 of the flat wire 11 are positioned in the same winding slot R, the first lead-out section 113 is positioned at the slot bottom, namely the first layer, the second lead-out section 114 is positioned at the slot opening, namely the nth layer, and n is 6.

The electrical connection mode of the motor 100 provided in the embodiment of the present application may be star connection or angle connection. At the axial ends of the stator 10, different electrical connections of the stator winding 1 can be achieved, in particular by means of the busbar arrangement 3, and the electrical connection of the electrodes 100 provided in the embodiments of the present application will be illustrated in the following by means of specific embodiments.

Fig. 15 is a schematic diagram of an arrangement and end buss connection of a 6-pole 54-slot continuous wave wound three-phase winding with a parallel branch number of 1. As shown in fig. 15, the winding of the stator winding 1 may be shown with reference to fig. 8a and 8b, and the U-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are U1in and U1out, U2in and U2out, U3in and U3out, U4in and U4out, U5in and U5out, and U6in and U6out, respectively. The 6 flat wires 11 of the U-phase winding are sequentially connected in series, U1out is connected with U2in, U2out is connected with U3in, U3out is connected with U4out, U4in is connected with U5out, U5in is connected with U6out, wherein U1in is used for U-phase input, and U6in is used for U-phase output. The W-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are W1in and W1out, W2in and W2out, W3in and W3out, W4in and W4out, W5in and W5out, and W6in and W6out, respectively. The 6 flat wires 11 of the W-phase winding are connected in series in sequence, W4out being connected to W5in, W5out being connected to W6in, V6out being connected to W1out, W1in being connected to W2out, W21in being connected to W3out, wherein W4in is used for W-phase input and W3in is used for W-phase output. The V-phase winding includes 6 flat wires 11, and both ends of the 6 flat wires 11 are V1in and V1out, V2in and V2out, V3in and V3out, V4in and V4out, V5in and V5out, and V6in and V6out, respectively. The 6 flat wires 11 of the V-phase winding are connected in series in sequence, V1out being connected to V2in, V2out being connected to V3in, V3out being connected to V4out, V4in being connected to V5out, V5in being connected to V6out, wherein V1in is used for V-phase input and V6in is used for V-phase output.

Taking the winding manner of the stator winding 1 shown in fig. 15 as an example, fig. 16a illustrates a circuit connection schematic of the stator winding 1 star connection of the motor 100 provided in the embodiment of the present application, and fig. 16b illustrates a structure of the bus structure 3 of the motor 100. As shown in fig. 16a, the U-phase winding includes 6 flat wires 11, and the 6 flat wires 11 are connected in series to form a branch in the manner shown in fig. 15. The W-phase winding includes 6 flat wires 11, and the 6 flat wires 11 are connected in series to form one branch in the manner shown in fig. 15. The V-phase winding includes 6 flat wires 11, and the 6 flat wires 11 are connected in series to form a branch in the manner shown in fig. 15. One end of each branch is used for connecting phase electricity, and the other end is used for being in star connection with the other two branches.

As shown in fig. 16b, the busbar arrangement 3 comprises a plurality of busbars and star bars 30. A plurality of bus bars are arranged at intervals along the circumferential direction of the stator 10, each bus bar being for connecting an input terminal of one phase winding and a corresponding phase electricity. The stator winding 1 is a three-phase winding, and the plurality of bus bars includes a first bus bar 34, a second bus bar 35, and a third bus bar 36. A plurality of first connection rows 31, a plurality of second connection rows 32, a plurality of third connection rows 33. Each first connection row 31 is for connecting two series U-phase flat wires 11, each second connection row 32 is for connecting two series W-phase flat wires 11, and each third connection row 33 is for connecting two series V-phase flat wires 11. The first bus bar 34 is used for connecting the input of the U phase, the second bus bar 35 is used for connecting the input of the W phase, the third bus bar 36 is used for connecting the input of the V phase, and the star connection bar 30 is used for simultaneously connecting the output of the three-phase winding.

The stator winding 1 comprises three-phase windings, and each winding comprises 6 flat wires 11 which are sequentially connected in series in 1 branch. Based on this, the busbar arrangement 3 further comprises a plurality of connection rows for connecting the series-connected flat wires 11. Specifically, the plurality of connection rows includes a plurality of first connection rows 31, a plurality of second connection rows 32, and a plurality of third connection rows 33. Each first connection row 31 is for connecting two series U-phase flat wires 11, each second connection row 32 is for connecting two series W-phase flat wires 11, and each third connection row 33 is for connecting two series V-phase flat wires 11. The plurality of connection rows are arranged in a staggered manner along the circumferential direction of the stator 10, any two connection rows are arranged at intervals along the radial direction or the axial direction of the stator 10, and each busbar is arranged on one side, far away from the axis of the stator, of any one connection row along the radial direction of the stator 10.

As shown in fig. 16c, the connection structure of the bus bar structure 3 and the stator winding 1 may be referred to, wherein the stator winding 1 includes 18 first lead-out sections 113 and 18 second lead-out sections 114, the first lead-out sections 113 are used for input, the second lead-out sections 114 are used for output, and the first lead-out sections 113 and the second lead-out sections 114 of the flat wire 11 are arranged at intervals along the radial direction of the stator 10. All the first lead-out sections 113 of the stator winding 1 are arranged at intervals along the circumferential direction of the stator 10, and any two adjacent first lead-out sections 113 are different by one slot. All the second lead-out sections 114 of the stator winding 1 are arranged at intervals along the circumferential direction of the stator 10, and any two adjacent second lead-out sections 114 are different by one slot. The 18 first lead-out sections 113 are U1in, U2in, U3in, U4in, U5in, U6in, W1in, W2in, W3in, W4in, W5in, W6in, V1in, V2in, V3in, V4in, V5in, V6in, respectively, and the 18 second lead-out sections 14 are U1out, U2out, U3out, U4out, U5out, U6out, W1out, W2out, W3out, W4out, W5out, W6out, V1out, V2out, V3out, V4out, V5out, V6out, respectively. The number of the first connection rows 31 is 5, and the 5 first connection rows 31 are respectively connected between U1out and U2in, between U2out and U3in, between U3out and U4out, between U4in and U5out, between U5in and U6out, and the first bus bar 34 is connected with U1 in. The number of the second connection rows 32 is 5, and the 5 second connection rows 32 are respectively connected between W4out and W5in, between W5out and W6in, between W6out and W1out, between W1in and W2out, between W21in and W3out, and the second bus bar 35 is connected with W4 in. The number of the third connection rows 33 is 5, and the 5 third connection rows 33 are respectively connected between V1out and V2in, between V2out and V3in, between V3out and V4out, between V4in and V5out, between V5in and V6out, and the third bus bar 36 is connected with V1 in. The star connection row 30 is simultaneously connected with U6in, W3in and V6in, so that star connection of the three-phase winding is realized.

With continued reference to the bus structure 3 shown in fig. 16b and 16c, any two structures are isolated and non-contacted to maintain insulation, and may be combined and fixed by injection molding during specific molding. Between any two structures, the injection molding can play a role in insulating isolation. All the first connection rows 31 are considered as one row group. All the second connection rows 32 are regarded as one row group, all the third connection rows 33 are regarded as one row group, each row group extends in an arc shape along the circumferential direction of the stator 10, and any two row groups are arranged in a staggered manner with respect to each other along the circumferential direction of the stator 10. The star connection rows 30 are arc-shaped and extend along the circumferential direction of the stator 10, and the star connection rows 30 and any one row group are arranged at intervals along the radial direction of the stator 10. The bus structure 3 with the structural form is characterized in that part of bus bars are overlapped along the axial direction of the stator 10, so that the radial dimension of the motor 10 can be reduced, the bus connection mode of the bus bars can avoid complex wiring of the end part of the stator winding 1, and the height of the axial end part of the motor 10 is reduced.

Taking the winding manner of the stator winding 1 shown in fig. 15 as an example, fig. 17a illustrates a schematic circuit connection diagram of the corner joint of the stator winding 1 of the motor 100 provided in the embodiment of the present application, and fig. 17b illustrates the structure of the bus structure 3 of the motor 100. As shown in fig. 17a, the U-phase winding includes 6 flat wires 11, and the 6 flat wires 11 are connected in series to form a branch in the manner shown in fig. 15. The W-phase winding includes 6 flat wires 11, and the 6 flat wires 11 are connected in series to form one branch in the manner shown in fig. 15. The V-phase winding includes 6 flat wires 11, and the 6 flat wires 11 are connected in series to form a branch in the manner shown in fig. 15. One end of each branch is used for being connected with the input of another phase winding, and the other end is used for being connected with the output of another phase winding.

As shown in fig. 17b, the bus structure 3 includes a first bus bar 34, a second bus bar 35, a third bus bar 36, a plurality of first connection bars 31, a plurality of second connection bars 32, and a plurality of third connection bars 33. Each first connection row 31 is for connecting two series U-phase flat wires 11, each second connection row 32 is for connecting two series W-phase flat wires 11, and each third connection row 33 is for connecting two series V-phase flat wires 11. The first bus bar 34 is used to connect the input of the U-phase and the output of the W-phase, the second bus bar 35 is used to connect the input of the W-phase and the output of the V-phase, and the third bus bar 36 is used to connect the input of the V-phase and the output of the U-phase.

As shown in fig. 17c, the bus structure 3 and the stator winding 1 may be connected by 5 first connection rows 31, and the 5 first connection rows 31 are respectively connected between U1out and U2in, between U2out and U3in, between U3out and U4out, between U4in and U5out, and between U5in and U6 out. The number of the second connection rows 32 is 5, and the 5 second connection rows 32 are respectively connected between W4out and W5in, between W5out and W6in, between W6out and W1out, between W1in and W2out, and between W21in and W3 out. The number of the third connection rows 33 is 5, and the 5 third connection rows 33 are respectively connected between V1out and V2in, between V2out and V3in, between V3out and V4out, between V4in and V5out, and between V5in and V6 out. The first bus bar 34 is connected between U1in and W3in, the second bus bar 35 is connected between W4in and V6in, and the third bus bar 36 is connected between V1in and U6 in. Fig. 17c only shows part of the first, second and third connection rows 31, 32, 33.

With continued reference to the bus structure 3 shown in fig. 17b and 17c, any two structures are isolated and non-contacted to maintain insulation, and the structures can be combined and fixed by injection molding during specific molding. Between any two structures, the injection molding can play a role in insulating isolation. All the first connection rows 31 are regarded as one row group, all the second connection rows 32 are regarded as one row group, all the third connection rows 33 are regarded as one row group, each row group extends along the circumferential arc of the stator 10, and any two row groups are arranged in a staggered manner along the circumferential direction of the stator 10. The bus structure 3 with the structural form is characterized in that part of bus bars are overlapped along the axial direction of the stator 10, so that the radial dimension of the motor 10 can be reduced, the bus connection mode of the bus bars can avoid complex wiring of the end part of the stator winding 1, and the height of the axial end part of the motor 10 is reduced.

Fig. 18 is a schematic diagram of an arrangement and end buss connection of a 6-pole 54-slot continuous wave wound three-phase winding with a parallel branch number of 2. As shown in fig. 18, the winding of the stator winding 1 may be shown with reference to fig. 8a and 8b, and the U-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are U1in and U1out, U2in and U2out, U3in and U3out, U4in and U4out, U5in and U5out, and U6in and U6out, respectively. The U-phase winding comprises a Ua branch and a Ub branch which are connected in parallel, the Ua branch comprises 3 flat wires 11 which are sequentially connected in series, and the Ub branch comprises 3 flat wires 11 which are sequentially connected in series. In the Ua leg, U1out is connected to U2in, U2out is connected to U3in, U1in is for the U phase input, and U3out is for the U phase output. In the Ub branch, U4in is connected with U5out, U5in is connected with U6out, U4out is used for U phase input, U3out is used for U phase output, and U6in is used for U phase output. The W-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are W1in and W1out, W2in and W2out, W3in and W3out, W4in and W4out, W5in and W5out, and W6in and W6out, respectively. The W-phase winding comprises two branches of a Wa branch and a Wb branch which are connected in parallel, wherein the Wa branch comprises 3 flat wires 11 which are sequentially connected in series, and the Wb branch comprises 3 flat wires 11 which are sequentially connected in series. In the Wa branch, W4out is connected to W5in, W5out is connected to W6in, where W4in is used for W phase input and W6out is used for W phase output. In the Wb branch, W1in is connected to W2out and W21in is connected to W3out, where W1out is used for W phase input and W3in is used for W phase output. The V-phase winding includes 6 flat wires 11, and both ends of the 6 flat wires 11 are V1in and V1out, V2in and V2out, V3in and V3out, V4in and V4out, V5in and V5out, and V6in and V6out, respectively. The V-phase winding comprises two parallel Va branches and a Vb branch, wherein the Va branches comprise 3 flat wires 11 which are sequentially connected in series, and the Vb branch comprises 3 flat wires 11 which are sequentially connected in series. In the Va branch, V1out is connected to V2in, V2out is connected to V3in, where V1in is used for V phase input and V3out is used for V phase output. In the Vb branch, V4in is connected to V5out and V5in is connected to V6out, where V4out is for the V phase input and V6in is for the V phase output.

Taking the winding manner of the stator winding 1 shown in fig. 18 as an example, fig. 19a is a schematic circuit connection diagram of the star connection of the stator winding 1 of the motor 100 according to the embodiment of the present application, and fig. 19b is a structure of the bus structure 3 of the motor 100. As shown in fig. 19a, 3 flat wires 11 of the U-phase winding are connected in series as shown in fig. 18 to form one branch, and the other 3 flat wires 11 of the U-phase winding are connected in series as shown in fig. 18 to form one branch, with the two branches connected in parallel. 3 flat wires 11 of the W-phase winding are connected in series to form one branch in the manner shown in fig. 18, and the other 3 flat wires 11 of the W-phase winding are connected in series to form one branch in the manner shown in fig. 18, and the two branches are connected in parallel. 3 flat wires 11 of the V-phase winding are connected in series as shown in fig. 18 to form one branch, and the other 3 flat wires 11 of the V-phase winding are connected in series as shown in fig. 18 to form one branch, with the two branches connected in parallel. One end of each branch is used for connecting phase electricity, and the other end is used for being in star connection with the other two branches.

As shown in fig. 19b, the bus structure 3 includes a first bus bar 34, a second bus bar 35, a third bus bar 36, two star connection bars 30, a plurality of first connection bars 31, a plurality of second connection bars 32, and a plurality of third connection bars 33. Each first connection row 31 is for connecting two series U-phase flat wires 11, each second connection row 32 is for connecting two series W-phase flat wires 11, and each third connection row 33 is for connecting two series V-phase flat wires 11. The first bus bar 34 is used for connecting the input of the U-phase, the second bus bar 35 is used for connecting the input of the W-phase, the third bus bar 36 is used for connecting the input of the V-phase, and each star connection 30 is used for simultaneously connecting the outputs of the three-phase windings.

Each phase winding comprises a plurality of branches connected in parallel, each branch comprising at least one flat wire 11 or at least two series. The bus structure 3 includes a plurality of parallel rows, each for connecting to the input terminals of the plurality of branches in phase and the bus. Specifically, the plurality of parallel rows includes a first parallel row 37 for connecting between the leg inputs of the two U phases, a second parallel row 38 for connecting between the leg inputs of the two W phases, and a third parallel row 39 for connecting between the leg inputs of the two V phases. Each parallel row may be connected to a busbar by an outgoing line of the flat wire 11.

As shown in fig. 19c, the connection structure between the bus structure 3 and the stator winding 1 may be referred to as a number of first connection rows 31 of 4, wherein two first connection rows 31 are respectively connected between U1out and U2in, between U2out and U3in, and the other two first connection rows 31 are respectively connected between U4in and U5out, and between U5in and U6 out. The number of second connection rows 32 is 4, two of the second connection rows 32 are respectively connected between W4out and W5in, W5out and W6in, two other second connection rows 32 are respectively connected between W1in and W2out, W21in and W3out, and the number of third connection rows 33 is 4, two of the third connection rows 33 are respectively connected between V1out and V2in, V2out and V3in, and two other third connection rows 33 are respectively connected between V4in and V5out, V5in and V6 out. One star connection row 30 is simultaneously connected with U6in, W3in and V6in, and the other star connection row 30 is simultaneously connected with U3out, V3out and W6out. The first bus bar 34 is connected to U1in, the second bus bar 35 is connected to W4in, and the third bus bar 36 is connected to V1 in. The first parallel row 37 is connected to both U1in and U4out, the second parallel row 38 is connected to both W4in and W1out, and the third parallel row 39 is connected to both V1in and V4 out.

Taking the winding manner of the stator winding 1 shown in fig. 18 as an example, fig. 20 is a schematic circuit connection diagram of the corner joint of the stator winding 1 of the motor 100 according to the embodiment of the present application. As shown in fig. 20, the U-phase winding includes 6 flat wires 11, wherein 3 flat wires 11 are connected in series as shown in fig. 18 to form one branch, and the other 3 flat wires 11 are connected in series as shown in fig. 18 to form one branch, and the two branches are connected in parallel. The W-phase winding includes 6 flat wires 11, wherein 3 flat wires 11 are connected in series as shown in fig. 18 to form one branch, and the other 3 flat wires 11 are connected in series as shown in fig. 18 to form one branch, and the two branches are connected in parallel. The V-phase winding includes 6 flat wires 11, wherein 3 flat wires 11 are connected in series as shown in fig. 18 to form one branch, and the other 3 flat wires 11 are connected in series as shown in fig. 18 to form one branch, and the two branches are connected in parallel. One end of each branch is used for being connected with the input of another phase winding, and the other end is used for being connected with the output of another phase winding. The bus structure 3 of the motor 100 is connected in a bus manner so long as the circuit connection principle shown in fig. 20 is satisfied, and will not be described.

Fig. 21 is a schematic diagram of an arrangement and end buss connection of a 6-pole 54-slot continuous wave wound three-phase winding with a parallel branch number of 3. As shown in fig. 21, the winding of the stator winding 1 may be shown with reference to fig. 8a and 8b, and the U-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are U1in and U1out, U2in and U2out, U3in and U3out, U4in and U4out, U5in and U5out, and U6in and U6out, respectively. The U-phase winding comprises three branches of parallel Ua branches, ub branches and Uc branches, wherein the Ua branches comprise 2 flat wires 11 which are sequentially connected in series, the Ub branches comprise 2 flat wires 11 which are sequentially connected in series, and the Uc branches comprise 2 flat wires 11 which are sequentially connected in series. In the Ua branch, U1out is connected to U4out, U1in is used for U-phase input, and U4in is used for output. In the Ub branch, U2out is connected to U5out, U2in is used for the U phase input, and U5in is used for the output. In the Uc branch, U3out is connected to U6out, U3in is used for the U phase input, and U6in is used for the output. The W-phase winding includes 6 flat wires 11, and two ends of the 6 flat wires 11 are W1in and W1out, W2in and W2out, W3in and W3out, W4in and W4out, W5in and W5out, and W6in and W6out, respectively. The W-phase winding comprises three branches of parallel Wa branches, wb branches and Wc branches, wherein the Wa branches comprise 2 flat wires 11 which are sequentially connected in series, the Wb branches comprise 2 flat wires 11 which are sequentially connected in series, and the Wc branches comprise 2 flat wires 11 which are sequentially connected in series. In the Wa branch, W4out is connected to W1out, W1in is used for output, and W4in is used for input. In the Wb branch, W5out is connected to W2out, W2in is used for output, and W5in is used for input. In the Wc branch, W6out is connected to W3out, W3in for output and W6in for input. The V-phase winding includes 6 flat wires 11, and both ends of the 6 flat wires 11 are V1in and V1out, V2in and V2out, V3in and V3out, V4in and V4out, V5in and V5out, and V6in and V6out, respectively. The V-phase winding comprises three parallel Va branches, vb branches and Vc branches, wherein the Va branches comprise 2 flat wires 11 which are sequentially connected in series, the Vb branches comprise 2 flat wires 11 which are sequentially connected in series, and the Vc branches comprise 2 flat wires 11 which are sequentially connected in series. In the Va branch, V1out is connected to V4out, V1in is used for V phase input, and V4in is used for output. In the Vb branch, V2out is connected to V5out, V2in is for V phase input and V5in is for output. In the Vc branch, V3out is connected with V6out, V3in is used for V phase input, and V6in is used for output.

Taking the winding manner of the stator winding 1 shown in fig. 21 as an example, fig. 22a is a schematic circuit connection diagram of the star connection of the stator winding 1 of the motor 100 according to the embodiment of the present application, and fig. 22b is a structure of the bus structure 3 of the motor 100. As shown in fig. 22a, 2 flat wires 11 of the U-phase winding are connected in series as shown in fig. 21 to form one branch, another 2 flat wires 11 are connected in series as shown in fig. 21 to form one branch, and finally 2 flat wires 11 are connected in series as shown in fig. 21 to form one branch, and the three branches are connected in parallel. The W-phase winding has 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, another 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, and the last 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, and the three branches are connected in parallel. The V-phase winding has 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, another 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, and the last 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, and the three branches are connected in parallel. One end of each branch is used for connecting phase electricity, and the other end is used for being in star connection with the other two branches.

As shown in fig. 22b, the bus structure 3 includes a first bus bar 34, a second bus bar 35, a third bus bar 36, a plurality of first connection bars 31, a plurality of second connection bars 32, and a plurality of third connection bars 33. Each first connection row 31 is for connecting two series U-phase flat wires 11, each second connection row 32 is for connecting two series W-phase flat wires 11, and each third connection row 33 is for connecting two series V-phase flat wires 11. The first bus bar 34 is used for connecting the input ends of three branches of the U-phase winding with the input ends of the U-phase, the second bus bar 35 is used for connecting the input ends of three branches of the W-phase winding with the input ends of the W-phase, the third bus bar 36 is used for connecting the input ends of three branches of the V-phase winding with the input ends of the V-phase, and the star connection 30 is used for simultaneously connecting the output ends of 9 branches.

As shown in fig. 22c, the connection structure between the bus structure 3 and the stator winding 1 may be referred to as a connection structure of 3 first connection rows 31, and the 3 first connection rows 31 are respectively connected between U1out and U4out, between U2out and U5out, and between U3out and U6out, and the first bus 34 is simultaneously connected with U1in, U2in, and U3in. The number of the second connection rows 32 is 3, and the 3 second connection rows 32 are respectively connected between W3out and W6out, between W2out and W5out, and between W1out and W6out, and the second bus bar 35 is simultaneously connected with W6in, W5in, and W4in. The number of the third connection rows 33 is 3, and the 3 third connection rows 33 are respectively connected between V1out and V4out, between V2out and V5out, between V3out and V6out, and the third bus bar 36 is simultaneously connected with V1in, V2in, and V3in. The star connection row 30 is simultaneously connected with U4in, U5in, U6in, W3in, W2in, W1in, V4in, V5in and V6in.

With continued reference to the bus structure 3 shown in fig. 22b and 22c, any two structures are isolated and non-contacted to maintain insulation, and may be combined and fixed by injection molding during specific molding. Between any two structures, the injection molding can play a role in insulating isolation. All the first connection rows 31 are regarded as one row group, all the second connection rows 32 are regarded as one row group, all the third connection rows 33 are regarded as one row group, each row group extends along the circumferential arc of the stator 10, and any two row groups are arranged in a staggered manner along the circumferential direction of the stator 10. The bus structure 3 with the structural form is characterized in that part of bus bars are overlapped along the axial direction of the stator 10, so that the radial dimension of the motor 10 can be reduced, the bus connection mode of the bus bars can avoid complex wiring of the end part of the stator winding 1, and the height of the axial end part of the motor 10 is reduced.

Taking the winding manner of the stator winding 1 shown in fig. 21 as an example, fig. 23 is a schematic circuit connection diagram of the corner joint of the stator winding 1 of the motor 100 according to the embodiment of the present application. As shown in fig. 23, 2 flat wires 11 of the U-phase winding are connected in series as shown in fig. 21 to form one branch, another 2 flat wires 11 are connected in series as shown in fig. 21 to form one branch, and finally 2 flat wires 11 are connected in series as shown in fig. 21 to form one branch, and three branches are connected in parallel. The W-phase winding has 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, another 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, and the last 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, and the three branches are connected in parallel. The V-phase winding has 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, another 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, and the last 2 flat wires 11 connected in series as shown in fig. 21 to form one branch, and the three branches are connected in parallel. One end of each branch is used for being connected with the input of one phase winding, and the other end is used for being connected with the output of the other phase winding. The bus structure 3 of the motor 100 is connected in a bus manner so long as the circuit connection principle shown in fig. 23 is satisfied, and will not be described.

Fig. 24 is a schematic diagram of an arrangement and end buss connection of a 6-pole 54-slot continuous wave wound three-phase winding with a parallel leg number of 6. As shown in fig. 25, the winding of the stator winding 1 may be shown with reference to fig. 8a and 8b, and the U-phase winding includes 6 flat wires 11, each flat wire 11 being 1 branch, and 6 branches being connected in parallel. The two ends of the 6 flat wires 11 are respectively U1in and U1out, U2in and U2out, U3in and U3out, U4in and U4out, U5in and U5out, U6in and U6out, U1in, U2in, U3in, U4out, U5out and U6out are used for U phase input, and U1out, U2out, U3out, U4in, U5in and U6in are used for U phase output. The W-phase winding comprises 6 flat wires 11, each flat wire 11 is 1 branch, and the 6 branches are connected in parallel. Two ends of the 6 flat wires 11 are respectively W1in and W1out, W2in and W2out, W3in and W3out, W4in and W4out, W5in and W5out, W6in and W6out, W1in, W2in, W3in, W4out, W5out, W6out are used for W-phase output, and W1out, W2out, W3out, W4in, W5in, W6in are used for W-phase input. The V-phase winding comprises 6 flat wires 11, each flat wire 11 is 1 branch, and 6 branches are connected in parallel. The two ends of the 6 flat wires 11 are V1in and V1out, V2in and V2out, V3in and V3out, V4in and V4out, V5in and V5out, V6in and V6out, respectively, V1out, V2out, V3out, V4in, V5in, V6in for V phase output, V1in, V2in, V3in, V4out, V5out, V6out for V phase input.

Taking the winding manner of the stator winding 1 shown in fig. 24 as an example, fig. 25 is a schematic circuit connection diagram of the star connection of the stator winding 1 of the motor 100 provided in the embodiment of the present application, and fig. 26 is a schematic circuit connection diagram of the corner connection of the stator winding 1 of the motor 100 provided in the embodiment of the present application.

As shown in fig. 25, in 6 branches formed by 6 flat wires 11 of the U-phase winding, an input end of each branch is connected to the U-phase power, and an output end is used for star connection. In 6 branches formed by 6 flat wires 11 of the W-phase winding, the input end of each branch is connected with W-phase electricity, and the output end is used for star connection. In 6 branches formed by 6 flat wires 11 of the V-phase winding, the input end of each branch is connected with V-phase electricity, and the output end is used for star connection.

As shown in fig. 26, among 6 branches formed by 6 flat wires 11 of the U-phase winding, an input terminal of each branch is connected to the U-phase power, and an output terminal is connected to the V-phase power. In 6 branches formed by 6 flat wires 11 of the W-phase winding, the input end of each branch is connected with W-phase electricity, and the output end is used for U-phase electricity. In 6 branches formed by 6 flat wires 11 of the V-phase winding, the input of each branch is connected with V-phase electricity, and the output end is used for connecting W-phase electricity.

It should be appreciated that the winding pattern of the 8-pole 72 slot, 6-layer full-pitch three-phase winding per slot is similar to the 6-pole 54 slot, 6-layer full-pitch three-phase winding per slot, and that the 8-pole 72 slot, 6-layer full-pitch three-phase winding per slot also has 18 lead-ins and 18 lead-outs, the arrangement of which can be referred to the 6-pole 54 slot, 6-layer full-pitch three-phase winding per slot embodiment. Specifically, a schematic diagram of the arrangement and end confluence connection of the 8-pole 72-slot, 6-layer full-pitch three-phase windings with a parallel branch number of 1 may be shown in fig. 15, a star connection circuit may be shown in fig. 16a, and an angle connection circuit may be shown in fig. 17 a. A schematic diagram of the arrangement of the 8-pole 72-slot and 6-layer full-pitch three-phase windings with the number of parallel branches being 2 and the end bus connection can be shown in fig. 18, the star connection can be shown in fig. 19a, and the corner connection can be shown in fig. 20. A schematic diagram of the arrangement of the 8-pole 72-slot and 6-layer full-pitch three-phase windings with 3 parallel branches and end bus connection can be shown in fig. 21, a star connection circuit can be shown in fig. 22a, and an angle connection circuit can be shown in fig. 23. A schematic diagram of the arrangement of the 8-pole 72-slot and 6-layer full-pitch three-phase windings in each slot under the parallel branch number of 6 and the end bus connection can be shown in fig. 24, the star connection circuit can be shown in fig. 25, and the corner connection circuit can be shown in fig. 26. Of course, the winding pattern of the 8-pole 72 slot, 6-layer full-pitch three-phase winding per slot is similar to the 6-pole 54 slot, 6-layer full-pitch three-phase winding convergence principle, but in the physical structure of the particular motor 100, the convergence structure 3 may have structural and extension angle variations.

Fig. 27 is a schematic diagram showing an arrangement of the 8-pole 48-slot, 6-layer continuous wave wound three-phase windings in parallel branch number 1 and end confluence connection, and the winding of the stator winding 1 can be referred to fig. 13a and 13 b. The U-phase winding comprises 4 flat wires 11, two ends of the 4 flat wires 11 are respectively U1in and U1out, U2in and U2out, U3in and U3out, U4in and U4out, the 4 flat wires 11 of the U-phase winding are sequentially connected in series, the U1out is connected with the U2in, the U2out is connected with the U3out, the U3in is connected with the U4out, the U1in is used for U-phase input, and the U4in is used for U-phase output. The W-phase winding comprises 4 flat wires 11, two ends of the 4 flat wires 11 are respectively W1in and W1out, W2in and W2out, W3in and W3out, and W4in and W4out, the 4 flat wires 11 of the W-phase winding are sequentially connected in series, the W3out is connected with the W4in, the W4out is connected with the W1out, the W1in is connected with the W2out, wherein W3in is used for U-phase input, and W2in is used for U-phase output.

Taking the winding manner of the stator winding 1 shown in fig. 27 as an example, fig. 28 is a schematic circuit connection diagram of the star connection of the stator winding 1 of the motor 100 provided in the embodiment of the present application, and fig. 29 is a schematic circuit connection diagram of the corner connection of the stator winding 1 of the motor 100 provided in the embodiment of the present application.

As shown in fig. 28, 4 flat wires 11 of the U-phase winding are connected in series to form one branch in the manner shown in fig. 27, 4 flat wires 11 of the W-phase winding are connected in series to form one branch in the manner shown in fig. 27, and 4 flat wires 11 of the V-phase winding are connected in series to form one branch in the manner shown in fig. 27. The input end of each branch is used for connecting phase electricity, and the output end is used for being in star connection with other two branches.

As shown in fig. 29, 4 flat wires 11 of the U-phase winding are connected in series in the manner shown in fig. 27 to form a branch, the input end of which is used for connecting the U-phase electricity, and the output end of which is used for connecting the V-phase electricity. The 4 flat wires 11 of the W-phase winding are connected in series in the manner shown in fig. 27 to form a branch, the input end of which is used for connecting W-phase electricity, and the output end of which is used for connecting U-phase electricity. The 4 flat wires 11 of the V-phase winding are connected in series in the manner shown in fig. 27 to form a branch, the input end of which is used for connecting the V-phase electricity, and the output end of which is used for connecting the W-phase electricity.

Fig. 30 is a schematic diagram showing an arrangement of the continuous wave wound three-phase windings of 8 poles 48 slots and 6 layers per slot with a parallel branch number of 2 and an end confluence connection, and the winding of the stator winding 1 can be referred to in fig. 13a and 13 b. The U-phase winding comprises 4 flat wires 11, two ends of the 4 flat wires 11 are U1in and U1out, U2in and U2out, U3in and U3out, U4in and U4out respectively, the U-phase winding comprises two parallel branches of a Ua branch and a Ub branch, the Ua branch comprises 2 flat wires 11 which are sequentially connected in series, and the Ub branch comprises 2 flat wires 11 which are sequentially connected in series. In the Ua leg, U1out is connected to U2in, U1in for U phase input and U2out for U phase output. In the Ub branch, U3in is connected to U4out, U3out is used for U-phase input, and U4in is used for U-phase output. The W-phase winding comprises 4 flat wires 11, two ends of the 4 flat wires 11 are respectively W1in and W1out, W2in and W2out, W3in and W3out, and W4in and W4out, the W-phase winding comprises two parallel-connected Wa branches and Wb branches, the Wa branches comprise 2 flat wires 11 which are sequentially connected in series, and the Wb branches comprise 2 flat wires 11 which are sequentially connected in series. In the Wa branch, W3out is connected to W4in, W3in for W-phase input and W4out for W-phase output. In the Wb branch, W1in is connected to W2out, W1out is used for W-phase input, and W2in is used for W-phase output. The V-phase winding comprises 4 flat wires 11, two ends of the 4 flat wires 11 are respectively V1in and V1out, V2in and V2out, V3in and V3out, and V4in and V4out, the V-phase winding comprises two parallel Va branches and Vb branches, the Va branches comprise 2 flat wires 11 which are sequentially connected in series, and the Vb branches comprise 2 flat wires 11 which are sequentially connected in series. In the Va branch, V1out is connected to V2in, V1in for V phase input and V2out for V phase output. In the Vb branch, V3in is connected to V4out, V3out for V phase input and V4in for V phase output.

Taking the winding manner of the stator winding 1 shown in fig. 30 as an example, fig. 31 is a schematic circuit connection diagram of the star connection of the stator winding 1 of the motor 100 provided in the embodiment of the present application, and fig. 32 is a schematic circuit connection diagram of the corner connection of the stator winding 1 of the motor 100 provided in the embodiment of the present application.

As shown in fig. 31, 2 flat wires 11 of the U-phase winding are connected in series to form one branch in the manner shown in fig. 30, and the other 2 flat wires 11 of the U-phase winding are connected in series to form one branch in the manner shown in fig. 30, with the two branches connected in parallel. 2 flat wires 11 of the W-phase winding are connected in series to form one branch in the manner shown in fig. 30, and the other 2 flat wires 11 of the W-phase winding are connected in series to form one branch in the manner shown in fig. 30, with the two branches connected in parallel. 2 flat wires 11 of the V-phase winding are connected in series to form one branch in the manner shown in fig. 30, and the other 2 flat wires 11 of the V-phase winding are connected in series to form one branch in the manner shown in fig. 30, with the two branches connected in parallel. One end of each branch is used for connecting phase electricity, and the other end is used for being in star connection with the other two branches.

As shown in fig. 32, 2 flat wires 11 of the U-phase winding are connected in series in the manner shown in fig. 30 to form one branch, the other 2 flat wires 11 of the U-phase winding are connected in series in the manner shown in fig. 30 to form one branch, the two branches are connected in parallel, and an input end of each branch is used for connecting U-phase electricity, and an output end is used for connecting V-phase electricity. 2 flat wires 11 of the W-phase winding are connected in series in a manner shown in fig. 30 to form a branch, the other 2 flat wires 11 of the W-phase winding are connected in series in a manner shown in fig. 30 to form a branch, the two branches are connected in parallel, an input end of each branch is used for connecting W-phase electricity, and an output end of each branch is used for connecting U-phase electricity. 2 flat wires 11 of the V-phase winding are connected in series in a mode shown in fig. 30 to form a branch, the other 2 flat wires 11 of the V-phase winding are connected in series in a mode shown in fig. 30 to form a branch, the two branches are connected in parallel, the input end of each branch is used for connecting V-phase electricity, and the output end is used for connecting W-phase electricity.

Fig. 33 is a schematic diagram of arrangement and end confluence connection of the continuous wave wound three-phase winding of 8 poles 48 slots and 6 layers per slot under the parallel branch number of 4, and as shown in fig. 33, the winding of the stator winding 1 can refer to fig. 13a and 13b, and the U-phase winding includes 4 flat wires 11, each flat wire 11 is 1 branch, and is a Ua branch, a Ub branch, a Uc branch and a Ud branch which are respectively connected in parallel. The two ends of the 4 flat wires 11 are respectively U1in and U1out, U2in and U2out, U3in and U3out, U4in and U4out, U1in, U2in, U3out and U4out are used for U phase input, and U1out, U2out, U3in and U4in are used for U phase output. The W-phase winding includes 4 flat wires 11, and each flat wire 11 has 1 branch, which are respectively a Wa branch, a Wb branch, a Wc branch, and a Wd branch that are connected in parallel. Two ends of the 6 flat wires 11 are respectively W1in and W1out, W2in and W2out, W3in and W3out, W4in and W4out, W1in, W2in, W3out and W4out are used for W phase output, and W1out, W2out, W3in and W4in are used for W phase input. The V-phase winding comprises 4 flat wires 11, wherein each flat wire 11 is provided with 1 branch, and each flat wire 11 is respectively provided with a Va branch, a Vb branch, a Vc branch and a Vd branch which are connected in parallel. The two ends of the 4 flat wires 11 are V1in and V1out, V2in and V2out, V3in and V3out, V4in and V4out, respectively, V1out, V2out, V3in, V4in being used for V phase output, V1in, V2in, V3out, V4out being used for V phase input.

Taking the winding manner of the stator winding 1 shown in fig. 33 as an example, fig. 34 is a schematic circuit connection diagram of the star connection of the stator winding 1 of the motor 100 provided in the embodiment of the present application, and fig. 35 is a schematic circuit connection diagram of the corner connection of the stator winding 1 of the motor 100 provided in the embodiment of the present application.

As shown in fig. 34, among 4 branches formed by 4 flat wires 11 of the U-phase winding, an input end of each branch is connected to the U-phase electricity, and an output end is used for star connection. In 4 branches formed by 4 flat wires 11 of the W-phase winding, the input end of each branch is connected with W-phase electricity, and the output end is used for star connection. In 4 branches formed by 4 flat wires 11 of the V-phase winding, the input end of each branch is connected with V-phase electricity, and the output end is used for star connection.

As shown in fig. 35, among 4 branches formed by 4 flat wires 11 of the U-phase winding, an input terminal of each branch is connected to the U-phase power, and an output terminal is connected to the V-phase power. In 4 branches formed by 4 flat wires 11 of the W-phase winding, the input end of each branch is connected with W-phase electricity, and the output end is used for U-phase electricity. Of 4 branches formed by 4 flat wires 11 of the V-phase winding, an input of each branch is connected with V-phase electricity, and an output end is used for connecting W-phase electricity.

In summary, in the stator 10 of the flat wire motor provided in the embodiment of the present application, the stator winding 1 is formed by winding a plurality of continuous wave wound flat wires 11, two ends of each flat wire 11, that is, the terminals of the stator winding 1, can be connected with different flat wires 11 by adopting different connection modes through the bus structure 3, so as to form the flat wire motor with different circuits. The continuous wave wound flat wire 11 allows the stator 10 to be free of a large number of welds at both axial ends, simplifying the manufacturing process of the stator winding 1, and also reducing the end height of the stator winding 1, which in some embodiments may be reduced by at least 6-10mm. The continuous wave wound flat wire 11 can be applied to flat wire motors and flat wire layers with different pole grooves. The embodiment of the application exemplifies a 6-pole 54-slot three-phase motor, an 8-pole 48-slot three-phase motor and an 8-pole 72-slot three-phase motor which are commonly used in the electric automobile industry, and further exemplifies the number of layers of flat wires of one slot four wire, one slot six wire and one slot eight wire. The continuous wave winding flat wire 11 is adopted, the whole-pitch winding can be realized only by one pitch, and the short-pitch winding can be realized by two pitches, thereby being beneficial to simplifying the winding process and facilitating the automatic production.

It should be understood that the stator 10 with the continuous wave winding provided in the embodiments of the present application may be used for a driving motor for a new energy passenger car, a driving motor for a new energy commercial car, a driving motor for a field car, an industrial motor, a marine motor, etc. Where ground vehicles such as tourist buses, golf carts, etc.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A continuous wave wound flat wire motor stator, characterized in that the stator comprises a stator core and a stator winding, the stator core comprises a first end face, a second end face and a plurality of winding slots, the first end face and the second end face are opposite along the axial direction of the stator, and each winding slot penetrates through the stator core along the axial direction of the stator;

the stator winding includes a plurality of continuous wave wound flat wires, each of the flat wires including:

Each wire inserting section is embedded into one winding slot, and each winding slot is used for accommodating a plurality of wire inserting sections which are sequentially stacked along the radial direction of the stator;

the first line spanning sections are exposed out of the first end face, and the layer number of the two plug wire sections connected with each first line spanning section is different by 1;

the second line spanning sections are exposed out of the second end face, and the layer number of the two plug wire sections connected by each second line spanning section is different by 1;

the sum of the pitch of each of the first span segments and the pitch of each of the second span segments is equal to the number of winding slots divided by the pole pair number of the stator windings.

2. The stator of claim 1, wherein each of the flat wires comprises a first lead-out section and a second lead-out section, the plurality of plug wire segments, the plurality of first crossover segments, and the plurality of second crossover segments being distributed between the first lead-out section and the second lead-out section, wherein:

the first lead-out section and the second lead-out section are respectively exposed out of the first end face of the stator;

one of the plug wire segments connected to the first lead-out segment is arranged at the innermost side of one of the winding slots along the radial direction of the stator;

And the other wire inserting section connected with the second leading-out section is arranged at the outermost side of the other winding slot along the radial direction of the stator.

3. The stator of claim 2, wherein the first lead-out section and the second lead-out section are arranged at opposite intervals in a radial direction of the stator, and a plurality of the first span sections are arranged between the first lead-out section and the second lead-out section at intervals.

4. A stator as claimed in claim 2 or claim 3 wherein said plurality of first span segments are divided into a plurality of groups, said plurality of groups of first span segments being spaced apart along the circumference of said stator, a plurality of said first span segments within a same group being arranged radially of said stator.

5. The stator of claim 4, wherein a set of said first span segments is arranged between said first lead-out segment and said second lead-out segment in a radial direction of said stator, said set of first span segments being less than 1 number of insert segments within each of said winding slots.

6. A stator as claimed in claim 4 or claim 5 wherein a plurality of said first crossover segments within the same group each have one end of each of said first crossover segments connected to a respective one of said winding slots and each have the other end of each of said first crossover segments connected to a respective other one of said winding slots.

7. A stator according to any one of claims 2 to 6, wherein the stator winding comprises a multi-phase winding, each phase of the winding comprising two wire sets, each wire set comprising a plurality of the flat wires, the two wire sets being arranged offset in a circumferential direction of the stator;

the first and second crossover segments in one of the wire sets are symmetrical with the first and second crossover segments in the other of the wire sets along an axial center of the stator.

8. The stator of claim 7, wherein the slots in which the wire segments of any two adjacent flat wires are located are adjacent to each other in the circumferential direction of the stator in the same wire set.

9. The stator of claim 8, wherein in the same wire set, one slot is spaced between the first lead-out sections of any two adjacent flat wires, and one slot is spaced between the second lead-out sections of any two adjacent flat wires, along the circumferential direction of the stator.

10. The stator according to any one of claims 2 to 9, wherein the first lead-out sections of all the flat wires are arranged at intervals along the circumferential direction of the stator, and a slot position of one winding slot is arranged between any two adjacent first lead-out sections;

The second leading-out sections of all the flat wires are arranged at intervals along the circumferential direction of the stator, and a slot position of the winding slot is arranged between any two adjacent second leading-out sections at intervals.

11. The stator of any of claims 1-10, wherein the stator winding comprises a multi-phase winding, one phase of electricity for each phase of the winding, the stator comprising a plurality of bus bars arranged at the first end face, the plurality of bus bars being spaced circumferentially along the stator, each of the bus bars for connecting an input of one phase of the winding and the corresponding phase of electricity, the stator comprising a plurality of connection bars arranged at the first end face, wherein:

each phase of the winding comprises at least one branch, each branch comprises at least two flat wires connected in series, each connecting row is used for connecting the two flat wires connected in series, any two connecting rows are arranged at intervals along the radial direction or the axial direction of the stator, and each busbar is arranged at one side of any one connecting row away from the axis of the stator along the radial direction of the stator; or alternatively, the first and second heat exchangers may be,

each phase of the winding comprises a plurality of branches connected in parallel, each branch comprises at least one flat wire or at least two flat wires connected in series, and each parallel row is used for being connected with the input ends of the plurality of branches in phase and the busbar.

12. The stator according to any one of claims 1 to 11, wherein a first span section includes two first extension sections and a first break section connected between the two first extension sections in a circumferential direction of the stator, the first break section being disposed at an angle to a radial direction of the stator;

the distance between the first folded line segment and the connecting position of one side of the two first extending segments, which faces the axis of the stator, is larger than or equal to the thickness of the flat wire along the radial direction of the stator;

the second line crossing section comprises two second extension sections and a second line folding section connected between the two second extension sections along the circumferential direction of the stator, and the second line folding section and the radial direction of the stator form an included angle;

and the distance between the second folded line section and the connecting position of one side of the two second extending sections, which faces the axis of the stator, is larger than or equal to the thickness of the flat wire along the radial direction of the stator.

13. A flat wire electric machine comprising a rotor and a stator as claimed in any one of claims 1 to 12;

the stator core comprises a central hole which is respectively communicated with the winding slots, the central hole penetrates through the stator core along the axial direction of the stator, and the rotor is accommodated in the central hole.

14. A powertrain comprising a speed reducer and the flat wire motor of claim 13, wherein a motor shaft of the flat wire motor is used for driving an input shaft connected to the speed reducer.

15. A vehicle comprising a wheel and the powertrain of claim 14 for driving the wheel.