CN114844249A

CN114844249A - Flat wire motor stator and flat wire motor

Info

Publication number: CN114844249A
Application number: CN202210583068.1A
Authority: CN
Inventors: 张莉; 尹相睿; 赵慧超; 郭守仑; 孙明冲; 林展汐; 齐红阳
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2022-05-26
Filing date: 2022-05-26
Publication date: 2022-08-02

Abstract

The invention provides a flat wire motor stator and a flat wire motor, wherein the flat wire motor stator comprises: a plurality of stator slots are uniformly distributed on the circumference of the stator core, the stator winding is provided with three-phase windings, and each phase of winding is provided with four branches connected in parallel; each phase of winding is correspondingly provided with an embedded groove which is a part of the stator groove, and the branch winding of each phase is embedded into all the embedded grooves corresponding to each phase; the branch winding is formed by connecting a plurality of coils in series, each coil of the same branch winding corresponds to different cross winding areas, overlapping areas exist among the cross winding areas corresponding to different branch windings, and the coils in the overlapping areas have different spans and are mutually sleeved. In the invention, the branch winding strides over all layers and all grooves of a single phase, so that different potential differences among the layers, among the grooves and among the poles are avoided, the circumferential and radial phase balance among multiple branches is fully realized, the branch balance is still ensured even under the condition of rotor eccentricity, and no circulation exists.

Description

Flat wire motor stator and flat wire motor

Technical Field

The invention relates to the technical field of motors, in particular to a flat wire motor stator and a flat wire motor.

Background

Along with the increase of new energy market flat wire motor motorcycle type, showing of different motorcycle type volume production quantity promotes, and the production efficiency and the cost of flat wire motor have become the core of its development. At present, most domestic mass production flat wire motor stators have the problems of low automation degree, slow mass production rhythm, high die cost and the like, and are mainly reflected in large linear quantity, difficult connection of outgoing lines, complex jumper wires and the like.

In the design of a part of stators, in order to reduce the winding line type of the stator, the branches are matched with each other for balancing, the unbalance of the branches is neglected, and when the structure is eccentric, the branch balance cannot be realized to cause circulation under the condition that the motor rotor structure is eccentric or the potentials between different poles are different.

Disclosure of Invention

The invention mainly aims to provide a flat wire motor stator and a flat wire motor, which are used for solving the problems in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a flat-wire motor stator including: the stator core is uniformly distributed with a plurality of stator slots in the circumferential direction; the stator winding is provided with three-phase windings which are respectively arranged in the stator slots, and each phase of winding is provided with four branches which are connected in parallel; each phase of winding is correspondingly provided with an embedded groove which is a part of the stator groove, and the branch winding of each phase is embedded into all the embedded grooves corresponding to each phase; the branch winding is formed by connecting a plurality of coils in series, each coil of the same branch winding corresponds to different cross winding areas, overlapping areas exist among the cross winding areas corresponding to different branch windings, and the coils in the overlapping areas have different spans and are mutually sleeved.

Furthermore, the number of the stator slots is 12M, the number of poles of the motor is 2M, the stator slots are provided with 2K embedded layers from inside to outside, wherein M and K are positive integers more than or equal to 2; the coils are all embedded between two adjacent embedding layers, and the two adjacent coils inside and outside are positioned in different embedding layers.

Further, the coils on the branch windings are arranged at equal intervals in the circumferential direction, and the interval is six stator slots.

Furthermore, every two coils embedded into the layer are connected in series to form a circle of the stator winding, the number of the circles of the stator winding which are sequentially connected in series from inside to outside is K, and the first circle of the stator winding is arranged on one side close to the inner diameter of the stator iron core; the stator winding of even number of coils is formed by connecting coils with five stator slots in span and coils with seven stator slots in span in series in turn; the stator winding of the odd number of turns is formed by connecting coils with five stator slots in span and coils with seven stator slots in span in series in turn, and the coils at the tail positions of the odd number of turns are coils with six stator slots in span.

Further, the cross-winding direction of each coil is from the inner embedded layer to the outer embedded layer.

Furthermore, the phase outgoing line and the neutral point outgoing line of the stator winding are both located in the welding section of the stator winding.

Further, the phase outgoing line and the neutral point outgoing line of the stator winding are both positioned at the outermost circle or the innermost circle of the stator winding.

Further, the coil includes: the two insertion sections are arranged in parallel, and a cross winding space is formed between the two insertion sections; a twisted wire section connected between the two insertion sections; the welding section is connected in the one end that deviates from the section of turning round of inserting the section, and the welding section orientation deviates from to stride and leans out around space one side.

Furthermore, the welding section is formed on the insertion section in a bending mode.

According to another aspect of the invention, a flat wire motor is provided with the flat wire motor stator of any one of the above aspects.

By applying the technical scheme of the invention, the branch windings of each phase are embedded into all the corresponding embedded grooves, namely the branch windings span all layers and all grooves of a single phase, so that different potential differences among the layers, among the grooves and among the poles are avoided, the circumferential and radial phase balance among multiple branches is fully realized, and the branch balance is still ensured without circulating current even under the condition of eccentric rotor. The coils in the overlapping area have different spans and are sleeved with each other, namely, the coil with the large span is sleeved outside the coil with the small span, and the coils in the overlapping area have no interference, so that the twisted wire end of the stator winding is regular and neat, and special-shaped wire types such as jumper wires and reverse overwires do not exist.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of a flat wire motor stator;

fig. 2 shows a schematic diagram of the layer structure of stator slots;

FIG. 3 is a schematic diagram showing a distribution structure of stator winding lead-out wires;

FIG. 4 shows a schematic diagram of a coil structure;

FIG. 5 is a schematic diagram showing the sleeving relationship between coils;

fig. 6 shows a winding unwinding diagram of the first leg winding of the U-phase;

fig. 7 shows a winding unwinding diagram of the second branch winding of the U-phase;

fig. 8 shows a winding unwinding diagram of the third branch winding of the U-phase;

fig. 9 shows a winding deployment diagram of the fourth branch winding of the U-phase.

Wherein the figures include the following reference numerals:

1. a stator core; 2. a stator winding; 3. a coil; 4. an insertion section; 5. twisting a wire section; 6. and (7) welding the sections.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.

Referring to fig. 1 to 9, according to an embodiment of the present application, a flat wire motor stator is provided.

Specifically, the flat wire motor stator includes a stator core 1 and a stator winding 2. A plurality of stator slots are uniformly distributed on the circumference of the stator core 1. The stator winding 2 has three-phase windings which are arranged in the stator slots in sections, each phase winding having four parallel branches. Each phase of winding is correspondingly provided with an embedded groove which is a part of the stator groove, and the branch winding of each phase is embedded into all the embedded grooves corresponding to each phase. The branch winding is formed by connecting a plurality of coils 3 in series, each coil 3 of the same branch winding corresponds to different cross winding areas, overlapping areas exist among the cross winding areas corresponding to different branch windings, and the coils 3 in the overlapping areas have different spans and are mutually sleeved.

In this embodiment, the branch windings of each phase are embedded in all the corresponding embedded slots, that is, the branch windings span all the layers and all the slots of a single phase, so that different potential differences among the layers, among the slots and among the poles are avoided, the circumferential and radial phase balance among multiple branches is fully realized, and the branch balance is still ensured without circulating current even under the condition of rotor eccentricity. And, the span of every coil 3 located in the overlap region is different, and carry on the mutual cover and establish, namely the coil 3 cover of the large span is established outside the coil 3 of the small span, there is not interference between the coils 3 in the overlap region, make the stator winding 2 twist the line end rule regularly, there is no special-shaped line type such as jumper wire, reverse overline.

As shown in fig. 2, the number of the stator slots is 12M, the number of poles of the motor is 2M, and the stator slots have 2K embedded layers arranged from inside to outside, wherein M and K are positive integers greater than or equal to 2. The coils 3 are embedded between two adjacent embedding layers, and the two coils 3 adjacent to each other inside and outside are positioned in different embedding layers. Taking an 8-layer flat wire motor stator as an example, the number of layers is L1/L2/L3/L4/L5/L6/L7/L8 from inside to outside in sequence, L1 and L2 are used as a first circle, L3 and L4 are used as a second circle, and the like.

The winding position of the coil 3 is limited according to the number of stator poles and the number of slots corresponding to each pole, so that the span of the welding side of the coil 3 is uniform, and the welding interval is prevented from being frequently adjusted in the welding process. Because the number of slots corresponding to each pole of the stator is six, the circumferential intervals of the coils 3 are set to be six stator slots based on the number of slots of each pole, namely, the coils 3 on the branch windings are arranged at equal intervals in the circumferential direction, and the intervals are all six stator slots.

Specifically, every two coils 3 embedded in the layer are connected in series to form one circle of the stator winding 2, the number of the stator winding 2 is K, and the first circle of the stator winding 2 is arranged on one side close to the inner diameter of the stator iron core 1; the stator winding 2 with even number of turns is formed by sequentially and alternately connecting coils 3 with the span of five stator slots and coils 3 with the span of seven stator slots in series; the stator winding 2 of the odd number of turns is formed by connecting coils 3 spanning five stator slots and coils 3 spanning seven stator slots in series alternately in sequence, and the coils 3 at the end positions of the odd number of turns are coils 3 spanning six stator slots. The coil 3 with large span is sleeved outside the coil 3 with small span, no interference exists between the coils 3 in the overlapping area, the twisted wire end of the stator winding 2 is regular, and no special-shaped wire types such as jumper wires and reverse overwires exist.

In order to avoid reduction in tact time due to adjustment of individual twisting of the welding segments 6, the winding direction of each coil 3 is set from the inner embedded layer to the outer embedded layer, and the twisting direction of the welding segments 6 of the coils 3 is made uniform.

As shown in fig. 3, in order to keep the stator regular and uniform in shape and facilitate alignment and welding of the lead wires, both the phase lead wire and the neutral point lead wire of the stator winding 2 are disposed at the welding section 6 of the stator winding 2.

As shown in fig. 3, in order to facilitate connection of the three-phase lead wires and the neutral point and simplify the bus bar design, the phase lead wires and the neutral point lead wires of the stator winding 2 are both disposed at the outermost turn or the innermost turn of the stator winding 2.

As shown in fig. 4, the coil 3 includes an insertion section 4, a twisted wire section 5, and a welding section 6. The insertion section 4 has two insertion sections 4 arranged in parallel, and a winding space is formed between the two insertion sections 4. The twisted section 5 is connected between the two insertion sections 4, the welding section 6 is connected at one end of the insertion section 4 departing from the twisted section 5, and the welding section 6 inclines outwards towards the direction departing from the span and around one side of the space.

Furthermore, in order to make the welding section 6 more regular and avoid the bending deformation of the welding section 6, after the insertion section 4 is embedded into the stator slot, the insertion section 4 extending out of the stator slot is bent. That is, the welding segment 6 is formed by bending over the insertion segment 4.

In this embodiment, a stator of an 8-layer flat-wire motor with 8 poles and 48 slots is taken as an example for detailed description, the stator winding 2 includes four parallel branches, each branch is uniformly distributed in 1-8 layers of the stator (the position of the stator slot close to the inner diameter is taken as a first layer), and the electromagnetic symmetry of each branch winding is ensured. As shown in fig. 6 to 9, the winding formula is specifically described by taking a U-phase winding as an example:

as shown in fig. 6, the first branch is U1 and has sixteen windings, wherein seven coils 3 are provided with five stator slots in a span, seven coils 3 are provided with seven stator slots in a span, and two coils 3 are provided with six stator slots in a span, wherein the total number of the coils 3 is ten. Each coil 3 all connects with the mode that the ripples was wound, and 3 tip of coil weld in proper order and form first branch road, do in proper order: the first coil 3 of U1 is embedded in the stator slot from layer 1 of slot No. 7 and layer 2 of slot No. 14, with slot No. 7 solder segment 6 ending with U1 pinout. The second coil 3 of U1 is embedded in the stator slot from layer 1 of slot No. 20 and layer 2 of slot No. 25, the third coil 3 of U1 is embedded in the stator slot from layer 1 of slot No. 31 and layer 2 of slot No. 38, the fourth coil 3 of U1 is embedded in the stator slot from layer 1 of slot No. 44 and layer 2 of slot No. 2, the fifth coil 3 of U1 is embedded in the stator slot from layer 3 of slot No. 8 and layer 4 of slot No. 13, the sixth coil 3 of U1 is embedded in the stator slot from layer 3 of slot No. 19 and layer 4 of slot No. 26, the seventh coil 3 of U1 is embedded in the stator slot from layer 3 of slot No. 32 and layer 4 of slot No. 37, the eighth coil 3 of U1 is embedded in the stator slot from layer 3 of slot No. 43 and layer 4 of slot No. 2, the ninth coil 3 of U1 is embedded in the stator slot No. 5 and layer 6 of slot No. 8, and layer 1 of slot No. 19 is embedded in the tenth coil slot No. 19 and slot No. 19, the eleventh coil 3 of U1 is embedded in the stator slot from layer 5 of slot No. 32 and layer 6 of slot No. 37, the twelfth coil 3 of U1 is embedded in the stator slot from layer 5 of slot No. 43 and layer 6 of slot No. 1, the thirteenth coil 3 of U1 is embedded in the stator slot from layer 7 of slot No. 7 and layer 8 of slot No. 14, the fourteenth coil 3 of U1 is embedded in the stator slot from layer 7 of slot No. 20 and layer 8 of slot No. 25, the fifteenth coil 3 of U1 is embedded in the stator slot from layer 7 of slot No. 31 and layer 8 of slot No. 38, the sixteenth coil 3 of U1 is embedded in the stator slot from layer 7 of slot No. 44 and layer 8 of slot No. 1, wherein the end of slot 1 welding segment 6 is the U1 neutral point outgoing line.

As shown in fig. 7, the second branch is set to be U2, and has sixteen windings, wherein seven coils 3 are provided, the number of coils 3 is seven, the number of coils 3 is two, and the number of coils 3 is ten. Each coil 3 all connects with the mode that the ripples was wound, and winding head welds in proper order and forms the second branch road, does in proper order: the first coil 3 of U2 is embedded in the stator slot from 1 layer of slot No. 8 and 2 layers of slot No. 13, with the end of slot No. 8 solder segment 6 being the U2 pinout. The second coil 3 of U2 is embedded in the stator groove from layer 1 of slot No. 19 and layer 2 of slot No. 26, the third coil 3 of U2 is embedded in the stator groove from layer 1 of slot No. 32 and layer 2 of slot No. 37, the fourth coil 3 of U2 is embedded in the stator groove from layer 1 of slot No. 43 and layer 2 of slot No. 1, the fifth coil 3 of U2 is embedded in the stator groove from layer 3 of slot No. 7 and layer 4 of slot No. 14, the sixth coil 3 of U2 is embedded in the stator groove from layer 3 of slot No. 20 and layer 4 of slot No. 25, the seventh coil 3 of U2 is embedded in the stator groove from layer 3 of slot No. 31 and layer 4 of slot No. 38, the eighth coil 3 of U2 is embedded in the stator groove from layer 3 of slot No. 44 and layer 4 of slot No. 1, the ninth coil 3 of U2 is embedded in the stator groove from layer 5 of slot No. 7 and layer 6 of slot No. 14, the tenth coil 3 of slot No. 2 is embedded in layer No. 20 and slot No. 5, eleventh coil 3 of U2 is embedded in the stator slot from layer 5 of slot No. 31 and layer 6 of slot No. 38, twelfth coil 3 of U2 is embedded in the stator slot from layer 5 of slot No. 44 and layer 6 of slot No. 2, thirteenth coil 3 of U2 is embedded in the stator slot from layer 7 of slot No. 8 and layer 8 of slot No. 13, fourteenth coil 3 of U2 is embedded in the stator slot from layer 7 of slot No. 19 and layer 8 of slot No. 26, fifteenth coil 3 of U2 is embedded in the stator slot from layer 7 of slot No. 32 and layer 8 of slot No. 37, sixteenth coil 3 of U2 is embedded in the stator slot from layer 7 of slot No. 43 and layer 8 of slot No. 2, wherein slot No. 2 welding segment 6 ends are U2 neutral point outgoing lines.

As shown in fig. 8, the third branch is set to be U3, and has sixteen windings, wherein seven coils 3 are provided, the number of coils 3 is seven, the number of coils 3 is two, and the total number of coils 3 is ten. Each coil 3 all connects with the mode that the ripples was wound, and winding head welds in proper order and forms the third branch road, does in proper order: the first coil 3 of U3 is embedded in the stator slot from 8 layers of slot No. 8 and 7 layers of slot No. 1, with the end of slot No. 8 welded segment 6 being the U3 pinout. The second coil 3 of U3 is embedded in the stator groove from layer 1 of groove No. 43 and layer 7 of groove No. 38, the third coil 3 of U3 is embedded in the stator groove from layer 8 of groove No. 32 and layer 7 of groove No. 25, the fourth coil 3 of U3 is embedded in the stator groove from layer 8 of groove No. 19 and layer 7 of groove No. 14, the fifth coil 3 of U3 is embedded in the stator groove from layer 6 of groove No. 8 and layer 5 of groove No. 2, the sixth coil 3 of U3 is embedded in the stator groove from layer 6 of groove No. 44 and layer 5 of groove No. 37, the seventh coil 3 of U3 is embedded in the stator groove from layer 6 of groove No. 31 and layer 5 of groove No. 26, the eighth coil 3 of U3 is embedded in the stator groove from layer 6 of groove No. 20 and layer 5 of groove No. 13, the ninth coil 3 of U3 is embedded in the stator groove from layer 4 of groove No. 7 and layer 3 of groove No. 2, the tenth coil 3 of groove U3 is embedded in layer No. 37 groove No. 4 and layer 3 of groove No. 3544, eleventh coil 3 of U3 is embedded in the stator slot from layer 4 of slot No. 31 and layer 3 of slot No. 26, twelfth coil 3 of U3 is embedded in the stator slot from layer 4 of slot No. 20 and layer 3 of slot No. 13, thirteenth coil 3 of U3 is embedded in the stator slot from layer 2 of slot No. 7 and layer 1 of slot No. 1, fourteenth coil 3 of U3 is embedded in the stator slot from layer 2 of slot No. 43 and layer 1 of slot No. 38, fifteenth coil 3 of U3 is embedded in the stator slot from layer 2 of slot No. 32 and layer 1 of slot No. 25, sixteenth coil 3 of U3 is embedded in the stator slot from layer 2 of slot No. 19 and layer 1 of slot No. 14, wherein slot No. 14 welding segment 6 ends as U3 neutral point outgoing line.

As shown in fig. 8, the fourth branch is set to be U4, and has sixteen windings, wherein seven coils 3 are provided, the number of coils 3 is seven, the number of coils 3 is two, and the number of coils 3 is ten. Each coil 3 all connects with the mode that the ripples was wound, and winding head welds in proper order and forms the fourth branch road, does in proper order: the first coil 3 of U4 is embedded in the stator slot from 8 layers of slot No. 7 and 7 layers of slot No. 2, wherein the 7 slot solder segment 6 ends in a U4 outgoing line. The second coil 3 of U4 is embedded in the stator slot from layer 1 of slot No. 44 and layer 7 of slot No. 37, the third coil 3 of U4 is embedded in the stator slot from layer 8 of slot No. 31 and layer 7 of slot No. 26, the fourth coil 3 of U4 is embedded in the stator slot from layer 8 of slot No. 20 and layer 7 of slot No. 13, the fifth coil 3 of U4 is embedded in the stator slot from layer 6 of slot No. 7 and layer 5 of slot No. 1, the sixth coil 3 of U4 is embedded in the stator slot from layer 6 of slot No. 43 and layer 5 of slot No. 38, the seventh coil 3 of U4 is embedded in the stator slot from layer 6 of slot No. 32 and layer 5 of slot No. 25, the eighth coil 3 of U4 is embedded in the stator slot from layer 6 of slot No. 19 and layer 5 of slot No. 14, the ninth coil 3 of U4 is embedded in the stator slot No. 4 of slot No. 8 and layer 3 of slot No. 1, the ninth coil 3 of U4 is embedded in the stator slot No. 3 and layer No. 3, eleventh coil 3 of U4 is embedded in the stator slot from 4 layers of slot No. 32 and 3 layers of slot No. 25, twelfth coil 3 of U4 is embedded in the stator slot from 4 layers of slot No. 19 and 3 layers of slot No. 14, thirteenth coil 3 of U4 is embedded in the stator slot from 2 layers of slot No. 8 and 1 layer of slot No. 2, fourteenth coil 3 of U4 is embedded in the stator slot from 2 layers of slot No. 44 and 1 layer of slot No. 37, fifteenth coil 3 of U4 is embedded in the stator slot from 2 layers of slot No. 31 and 1 layer of slot No. 26, sixteenth coil 3 of U4 is embedded in the stator slot from 2 layers of slot No. 20 and 1 layer of slot No. 13, wherein slot No. 13 welding segment 6 ends as U3 neutral point outgoing line.

The V-phase winding is similar to the U-phase winding, the end part of the No. 11 slot welding section 6 is a V1 outgoing line, the end part of the No. 5 slot welding section 6 is a V1 neutral point outgoing line, the end part of the No. 12 slot welding section 6 is a V2 outgoing line, the end part of the No. 6 slot welding section 6 is a V2 neutral point outgoing line, the end part of the No. 12 slot welding section 6 is a V3 outgoing line, the end part of the No. 18 slot welding section 6 is a V3 neutral point outgoing line, the end part of the No. 11 slot welding section 6 is a V4 outgoing line, and the end part of the No. 17 slot welding section 6 is a V4 neutral point outgoing line.

The W-phase winding is similar to the U-phase winding, and for lead-out line concentration, it is preferable that: the end of the No. 9 slot welding section 6 is a W1 neutral point lead wire, the end of the No. 3 slot welding section 6 is a W1 lead wire, the end of the No. 10 slot welding section 6 is a W2 neutral point lead wire, the end of the No. 4 slot welding section 6 is a W2 lead wire, the end of the No. 10 slot welding section 6 is a W3 neutral point lead wire, the end of the No. 16 slot welding section 6 is a W3 lead wire, the end of the No. 9 slot welding section 6 is a W4 neutral point lead wire, and the end of the No. 15 slot welding section 6 is a W4 lead wire.

U1, U2, U3 and U4 are connected together to form a U-phase leading-out wire; v1, V2, V3 and V4 are connected together to form a V-phase leading-out wire; w1, W2, W3 and W4 are connected together to form a W-phase leading-out wire; wherein the neutral points are preferably connected in 4 number according to the distance. As shown in fig. 3, the specific layout of the pinout is:

reference numerals

7, 8, 22 and 23 in the figure are U-phase lead-out wires,

reference numerals

11, 12, 18 and 19 in the figure are V-phase lead-out wires, and

reference numerals

14, 15, 26 and 27 in the figure are W-phase lead-out wires;

reference numerals

9, 25, and 29 in the drawings denote first neutral points,

reference numerals

10, 24, and 28 in the drawings denote second neutral points,

reference numerals

13, 16, and 21 in the drawings denote third neutral points, and

reference numerals

14, 17, and 28 in the drawings denote fourth neutral points. The outgoing lines are all outgoing lines at the welding section 6, the three-phase outgoing lines and the neutral points are distributed and concentrated, connection is convenient, compact design is achieved, and full-automatic production is easy to achieve.

As shown in fig. 5 to 9, the coil 3 with the U1 branch spanning five stator slots and the coil 3 with the U2 branch spanning seven stator slots form seven pairs of large-span coil 3 groups, the coil 3 with the U1 branch spanning seven stator slots and the coil 3 with the U2 branch spanning five stator slots form seven pairs of large-span coil 3 groups, and there are fourteen pairs of large-span coil 3 groups, and similarly, there are fourteen pairs of large-span coil 3 groups between the U3 and the U4 branch, and the remaining winding with six spans are concentrated in a winding line type. The twisted wire section 5 of the stator winding 2 is regular and neat, and abnormal wire types such as reverse overline and the like do not exist.

Referring to fig. 6 to 9, the branch windings are connected in sequence in a linear manner by the coils 3 spanning five stator slots and the coils 3 spanning five stator slots, the last winding after the odd number of turns spans six stator slots is the coil 3, and then the layer is changed to enter the next turn until the winding is led out. Therefore, the single branch crosses all the grooves of all the layers of the U phase, different potential differences among the layers, between the grooves and between the poles are avoided, the circumferential and radial phase balance among the four branches is fully realized, and the branch balance is still ensured without circulating current even under the condition of eccentric rotor.

According to another aspect of the present invention, there is provided a flat wire motor including the flat wire motor stator in the above embodiment.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flat wire motor stator, comprising:

the stator comprises a stator core (1), wherein a plurality of stator slots are uniformly distributed in the circumferential direction of the stator core (1);

the stator winding (2) is provided with three-phase windings which are arranged in the stator slots respectively, and each phase winding is provided with four branches which are connected in parallel; each phase of winding is correspondingly provided with an embedded groove which is a part of the stator groove, and the branch winding of each phase is embedded into all the embedded grooves corresponding to each phase; the branch winding is formed by connecting a plurality of coils (3) in series, each coil (3) of the same branch winding corresponds to different cross winding areas, overlapping areas exist among the cross winding areas corresponding to different branch windings, and the coils (3) in the overlapping areas have different spans and are mutually sleeved.

2. The flat wire motor stator according to claim 1, wherein the number of the stator slots is 12M, the number of poles of the motor is 2M, the stator slots have 2K embedded layers arranged from inside to outside, wherein M and K are positive integers greater than or equal to 2; the coils (3) are embedded between the two adjacent embedding layers, and the coils (3) which are adjacent inside and outside are positioned in different embedding layers.

3. The flat wire motor stator according to claim 2, wherein the coils (3) on the branch windings are arranged at equal intervals in the circumferential direction, and the intervals are six stator slots.

4. The flat wire motor stator according to claim 3, wherein each two coils (3) embedded in the layer are connected in series to form one turn of the stator winding (2), the number of turns of the stator winding (2) connected in series from inside to outside is K, and the side close to the inner diameter of the stator core (1) is the first turn of the stator winding (2); the stator winding (2) of even number circle is formed by connecting coils (3) with five stator slots and coils (3) with seven stator slots alternately in series; the stator winding (2) of the odd number of turns is formed by sequentially and alternately connecting coils (3) with five stator slots in span and coils (3) with seven stator slots in span in series, and the coils (3) at the tail positions of the odd number of turns are the coils (3) with six stator slots in span.

5. The flat-wire motor stator according to claim 2, wherein the cross-winding direction of each coil (3) is from the inner embedded layer to the outer embedded layer.

6. The flat wire motor stator according to any one of claims 1 to 5, wherein the phase lead-out wire and the neutral lead-out wire of the stator winding (2) are located at the welded section (6) of the stator winding (2).

7. The flat wire motor stator according to claim 6, wherein the phase outgoing line and the neutral point outgoing line of the stator winding (2) are located at the outermost turn or the innermost turn of the stator winding (2).

8. The flat wire motor stator according to claim 1, wherein the coil (3) comprises:

the device comprises an insertion section (4) and a winding device, wherein the insertion section (4) is provided with two parallel insertion sections, and a winding space is formed between the two insertion sections (4);

a torsion section (5) connected between the two insertion sections (4);

a welding section (6) connected to an end of the insertion section (4) which is away from the twisted wire section (5), wherein the welding section (6) is inclined outwards towards a side away from the span winding space.

9. The flat-wire motor stator according to claim 8, characterized in that the welding section (6) is formed bent over the insertion section (4).

10. A flat wire motor having the flat wire motor stator according to any one of claims 1 to 9.