CN116154998A

CN116154998A - Flat wire motor stator, flat wire motor and vehicle

Info

Publication number: CN116154998A
Application number: CN202111398465.3A
Authority: CN
Inventors: 史俊旭; 陈致初; 胡勇峰; 胡明; 石鸿佼; 吴江权; 胡华; 郑钦; 王益有; 余俊杰
Original assignee: Zhuzhou CRRC Times Electric Co Ltd
Current assignee: Hunan Crrc Times Electric Drive Technology Co ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2023-05-23

Abstract

The invention discloses a flat wire motor stator, which comprises a stator winding and a stator core, wherein a plurality of core slots are arranged in the circumferential direction of the stator core, the stator winding comprises a multiphase winding, each phase winding comprises a plurality of groups of winding circuits which are connected in parallel, each group of winding circuits comprises three parallel branches, each branch comprises a plurality of coil groups which are sequentially arranged on the circumferential core slots of the stator core and are connected in series with each other, and each coil group comprises a plurality of coils which are penetrated in the same pair of core slots and are connected in series with each other; the number of layers of coils in each iron core groove increases in turn from the groove bottom to the groove opening, and in each coil group, the coils of the middle layer are arranged between two adjacent layers in a crossing manner, and the coils of the innermost layer or the outermost layer are positioned on the same layer. A flat wire motor is also disclosed, including a flat wire motor stator. A vehicle is also disclosed that includes a flat wire motor. The flat wire motor stator, the flat wire motor and the vehicle have the advantages of being capable of eliminating phase differences among different branches, reducing loss, increasing efficiency, prolonging service life and the like.

Description

Flat wire motor stator, flat wire motor and vehicle

Technical Field

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

Background

With the rapid development of new energy automobile technology, the driving motor is used as one of key execution components of the electric automobile, and the performance requirement is higher and higher. At present, high speed, light weight and high efficiency become the development trend of driving motors, and have higher requirements on power density, high-efficiency area and heat dissipation capacity of the motors.

The stator winding can be divided into round wire and flat wire, the flat wire motor is different from the round wire motor in the forming mode of copper wires, the flat wire is beneficial to the improvement of the full rate of the motor, the full rate of the flat wire motor is about 50% generally, and the full rate of the flat wire motor can reach more than 70%. The improvement of the groove filling rate means that more copper can be filled on the premise of unchanged space, the resistance of the motor is reduced, and the copper loss is reduced under the same current. Compared with a round wire motor, the contact area between copper conductors in the flat wire motor groove is large, and the heat dissipation effect is better.

The winding arrangement and connection mode of the flat wire motor is one of the difficulties of the motor design, and the existing coil arrangement mode generally has the following problems:

1) There is a problem in that winding wires are not symmetrical. To reduce copper loss, the number of layers of the stator conductor per slot is generally increased, such as 4 layers, 6 layers, 8 layers, etc. Because conductors of each parallel branch are distributed at different positions of the iron core slots, the number of coils of each branch in each iron core slot is generally different, phase differences are generated between different branches, the branches are difficult to be symmetrical, and large differences among counter potential, resistance and inductance can be caused, so that circulation is formed, additional loss is increased, efficiency is reduced, meanwhile, local over-temperature of a motor winding is caused, and the service life of the motor is prolonged.

2) The production efficiency is low. To reduce copper consumption, the number of conductor layers per slot of the stator is generally increased, such as 4 layers, 6 layers, 8 layers, etc., and the more the number of coil types, the higher the manufacturing cost of the winding and the lower the production efficiency.

3) The bus bar with complex structure is needed for the winding outgoing line, neutral point connection and the like of the conventional flat wire motor, and the height of the bus bar is higher than the height of the winding end part, so that the axial length of the motor is increased.

4) There are many different coils, and the presence of different coils will increase the difficulty of coil manufacture, which is not beneficial to mass production.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a flat wire motor stator, a flat wire motor and a vehicle, which can eliminate phase differences among different branches, reduce loss, increase efficiency and improve service life.

In order to solve the technical problems, the invention adopts the following technical scheme:

the flat wire motor stator comprises a stator winding and a stator core, wherein a plurality of core slots are formed in the circumferential direction of the stator core, the stator winding comprises a multiphase winding, each phase winding comprises one or more groups of winding circuits which are connected in parallel, each group of winding circuits comprises three parallel branches, each branch comprises a plurality of coil groups which are sequentially arranged on the circumferential core slots of the stator core and are connected in series with each other, and each coil group comprises a plurality of coils which are penetrated in the same pair of core slots and are connected in series with each other; the number of layers of coils in each iron core slot is increased from the slot to the notch in turn, and in each coil group, the coils in the middle layer are spanned between two adjacent layers, and the coils in the innermost layer or the outermost layer are positioned in the same layer.

As a further improvement of the above technical scheme:

the coil comprises a coil body and a bending part, wherein the coil body comprises two groove penetrating parts which are arranged in parallel with each other and a connecting part which is connected with one end of each groove penetrating part, the bending part is positioned at the other end of each groove penetrating part and forms a welding end, the two groove penetrating parts of the coil positioned in the middle layer are respectively positioned in two adjacent layers, and the two groove penetrating parts of the coil positioned in the innermost layer or the outermost layer are positioned in the same layer.

The two bending portions of the coil located in the intermediate layer are respectively bent toward the inner side in the width direction of the coil body.

Two bending portions located at the innermost or outermost coil are bent toward one side in the width direction of the coil body.

The three parallel branches of each winding circuit are respectively set as a first branch A, a second branch B and a third branch C, wherein the first branch A comprises coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10 and A11-a12, the second branch B comprises coils B1-B2, B3-B4, B5-B6, B7-B8, B9-B10 and B11-B12, and the third branch C comprises coils C1-C2, C3-C4, C5-C6, C7-C8, C9-C10 and C11-C12; a1-a2, A3-a4, A5-a6, A7-a8, B1-B2, B3-B4, B5-B6, B7-B8, C1-C2, C3-C4, C5-C6, C7-C8 are positioned in the same pair of core slots, A9-a10, A11-a12, B9-B10, B11-B12, C9-C10, C11-C12 are positioned in another pair of core slots;

the two slot penetrating parts of the coils A1-a2, B1-B2 and C1-C2 are positioned on the 1 st layer of the bottom of the slot of the iron core along the slot opening direction, the pitch of the coils B1-B2 and C1-C2 is y-1, the pitch of the coils A1-a2 is y+2, and y is a positive integer; alternatively, the two slot penetrating parts 111 of the coils A1-a2, B1-B2 and C1-C2 are positioned on the 1 st layer of the inner slot bottom of the iron core slot 3 along the slot opening direction, the pitch of the B1-B2 and the C1-C2 is y+1, the pitch of the A1-a2 is y-2, and y is a positive integer;

the pitches of A3-a4, B3-B4 and C3-C4 are y, and two through slots of the A3-a4, the B3-B4 and the C3-C4 are respectively positioned on the 2 nd layer and the 3 rd layer of the iron core slot;

the pitches of A5-a6, B5-B6 and C5-C6 are y, and two through slots of the A5-a6, the B5-B6 and the C5-C6 are respectively positioned at the 4 th layer and the 5 th layer of the iron core slot;

the pitch of A7-a8 and C7-C8 is y-1, the pitch of B7-B8 is y+2, and two slot penetrating parts of the three are positioned on the 6 th layer of the iron core slot; or the pitches of A7-a8 and C7-C8 are y+1, the pitch of B7-B8 is y-2, and two slot penetrating parts of the three are positioned on the 6 th layer of the iron core slot;

the pitches of A9-a10, B9-B10 and C9-C10 are y, and two through slots of the A9-a10, the B9-B10 and the C9-C10 are respectively positioned at the 5 th layer and the 4 th layer of the iron core slot;

the pitches of A11-a12, B11-B12 and C11-C12 are y, and two through slots of the A11-a12, the B11-B12 and the C11-C12 are respectively positioned at the 3 rd layer and the 2 nd layer of the iron core slot;

a1-a2 is connected with A3-a4 at a welding end, A3-a4 coil is connected with A5-a6 at a welding end, A5-a6 is connected with A7-a8 at a welding end, A7-a8 is connected with A9-a10 at a welding end, A9-a10 is connected with A11-a12 at a welding end, and so on;

B1-B2 is connected with B3-B4 at a welding end, B3-B4 coil is connected with B5-B6 at a welding end, B5-B6 is connected with B7-B8 at a welding end, B7-B8 is connected with B9-B10 at a welding end, B9-B10 is connected with B11-B12 at a welding end, and so on;

C1-C2 is connected with C3-C4 at the welding end, C3-C4 coil is connected with C5-C6 at the welding end, C5-C6 is connected with C7-C8 at the welding end, C7-C8 is connected with C9-C10 at the welding end, C9-C10 is connected with C11-C12 at the welding end, and so on;

the coil connection sequence is from layer 1 to layer 6 in turn, and then from layer 6 to layer 1 in turn, and the cycle is repeated.

The pitches of the coils located at the innermost layer or the outermost layer are the same.

The three parallel branches of each group of winding circuits are respectively set as a first branch A, a second branch B and a third branch C, wherein the first branch A comprises coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10 and A11-a12, the second branch B comprises coils B1-B2, B3-B4, B5-B6, B7-B8, B9-B10 and B11-B12, and the third branch C comprises coils C1-C2, C3-C4, C5-C6, C7-C8, C9-C10 and C11-C12; a1-a2, A3-a4, A5-a6, A7-a8, B1-B2, B3-B4, B5-B6, B7-B8, C1-C2, C3-C4, C5-C6, C7-C8 are positioned in the same pair of core slots, A9-a10, A11-a12, B9-B10, B11-B12, C9-C10, C11-C12 are positioned in another pair of core slots;

the pitches of A7-a8, B7-B8 and C7-C8 are y, and two slot penetrating parts of the three are positioned on the 6 th layer of the iron core slot;

The number of layers of the coils in the iron core slots is an even number layer which is larger than two layers.

A flat wire motor comprises the flat wire motor stator.

A vehicle comprises the motor.

Compared with the prior art, the invention has the advantages that:

the invention relates to a flat wire motor stator, wherein each coil group comprises a plurality of coils which are penetrated in the same pair of iron core grooves and are connected in series; the number of layers of coils in each iron core groove is increased in sequence from the groove to the notch, in each coil group, coils of the middle layer are arranged between two adjacent layers in a crossing mode, so that each iron core groove is provided with coil groups of at least two branches in a penetrating mode, the number of coils of each branch in the iron core groove is the same, and phase differences among different branches are eliminated. Meanwhile, the coil groups of all the branches are sequentially arranged around the circumference of the stator core and are mutually connected in series, so that the winding forms of all the branches are that coils are cross-connected from the innermost layer to the outermost layer of the core slot and then from the outermost layer to the innermost layer, the symmetry of each branch is ensured, the loss is reduced, the efficiency is increased and the service life is prolonged.

The flat wire motor comprises the flat wire motor stator, has the advantages as described above, and has the advantages of simple integral structure, small volume and high working stability.

The vehicle of the invention, comprising the flat wire motor described above, also has the advantages described above for the flat wire motor stator.

Drawings

Fig. 1 is a schematic perspective view showing an upward connection part of a stator of a flat wire motor according to the present invention.

Fig. 2 is a schematic perspective view of the stator of the flat wire motor of the present invention with the welded end facing upward.

Fig. 3 is a schematic perspective view of an intermediate layer coil of a flat wire motor stator of the present invention.

Fig. 4 is a schematic diagram of the front view of the intermediate layer coil of the flat wire motor stator of the present invention.

Fig. 5 is a schematic structural view of the innermost and outermost coils of the flat wire motor stator of the present invention.

Fig. 6 is a schematic diagram of a structure of a commutation winding of a flat wire motor stator of the present invention.

Fig. 7 is a schematic layout of a stator winding of a flat wire motor stator according to the present invention in the first embodiment.

Fig. 8 is a schematic layout of a stator winding of a flat wire motor stator according to the present invention in the second embodiment.

Fig. 9 is a schematic view of another construction of the commutation winding of the flat wire motor stator of the present invention.

Fig. 10 is a schematic layout of a stator winding of a flat wire motor stator according to the present invention in a third embodiment.

Fig. 11 is a schematic layout of a stator winding of a flat wire motor stator according to the present invention in the fourth embodiment.

The reference numerals in the drawings denote:

1. a stator winding; 11. a coil main body; 111. a groove penetrating part; 112. a connection part; 12. a bending part; 2. a stator core; 3. and the iron core slot.

Detailed Description

The invention will be described in further detail with reference to the drawings and the specific examples.

Embodiment one:

fig. 1 to 7 show an embodiment of a flat wire motor stator of the present invention, which comprises a stator winding 1 and a stator core 2, wherein a plurality of core slots 3 are circumferentially arranged in the stator core 2, the stator winding 1 comprises a multi-phase winding, each phase winding comprises a plurality of groups of parallel winding lines, each group of winding lines comprises three parallel branches, each branch comprises a plurality of coil groups which are sequentially arranged on circumferential core slots of the stator core 2 and are mutually connected in series, and each coil group comprises a plurality of coils which are penetrated in the same pair of core slots 3 and are mutually connected in series; the number of layers of coils in each iron core slot 3 increases in turn from the slot lower to the notch, and in each coil group, the coils of the middle layer are arranged between two adjacent layers in a crossing manner, and the coils of the innermost layer or the outermost layer are positioned on the same layer.

The flat wire motor stator comprises a plurality of coils which are penetrated in the same pair of iron core slots 3 and are connected in series; the number of layers of coils in each iron core slot 3 is increased in sequence from the slot to the slot opening, in each coil group, coils in the middle layer are arranged between two adjacent layers in a crossing mode, so that each iron core slot 3 is provided with coil groups of at least two branches in a penetrating mode, the number of coils of each branch in each iron core slot 3 is the same, and phase differences among different branches are eliminated. Meanwhile, the coil groups of all the branches are sequentially arranged around the circumference of the stator core 2 and are mutually connected in series, so that the winding forms of all the branches are that coils are connected from the innermost layer to the outermost layer of the core slot 3 in a crossing manner and then from the outermost layer to the innermost layer, the symmetry of each branch is ensured, the loss is reduced, the efficiency is increased, and the service life is prolonged.

In this embodiment, as shown in fig. 3 to 5, the coil includes a coil body 11 and a bending portion 12, the coil body 11 includes two through-slot portions 111 arranged parallel to each other and a connecting portion 112 connected to one end of the two through-slot portions 111, the bending portion 12 is located at the other end of the two through-slot portions 111 and forms a welding end, the two through-slot portions 111 of the coil located in the middle layer are respectively located in two adjacent layers, and the two through-slot portions 111 of the coil located in the innermost layer or the outermost layer are located in the same layer. The connection portion 112 is V-shaped or arc-shaped, and makes the coil body 11U-shaped or V-shaped.

Because each coil adopts the same type (U type or V type), the opposite coil and the jumper coil are omitted, and various coils are reduced, so that the assembly and the mass production are convenient, and the production efficiency is improved. The two through groove parts 111 of the coil positioned at the innermost layer or the outermost layer are positioned at the same layer, thereby further facilitating assembly.

In this embodiment, as shown in fig. 3 and 4, two bending portions 12 of the coil located in the middle layer of the core slot 3 are respectively bent inward in the width direction of the coil body 11. Facilitating the series connection of the coils of the intermediate layer.

In this embodiment, as shown in fig. 5, two bent portions 12 of the coil located at the innermost layer (i.e., the first layer in the slot-to-slot direction from the slot bottom) or the outermost layer (the last layer in the slot-to-slot direction from the slot bottom) of the core slot 3 are bent toward one side in the width direction of the coil body 11. The coil groups of the branches are conveniently connected in series. The coils positioned at the innermost layer and/or the outermost layer of the iron core slot 3 are arranged as sequencing windings (as shown in fig. 6), and two slot penetrating parts 111 of the sequencing windings are positioned at the same layer, so that the assembly and mass production are facilitated, and the production efficiency is improved.

In this embodiment, the neutral points (such as a36, b36 and c 36) of each coil are connected by copper busbar, the height of the copper busbar does not exceed the height of the welding end of the coil, and the structure is simple, and the height of the winding end is reduced, so that the volume of the motor is reduced.

In this embodiment, three parallel branches of each winding circuit are respectively set as a first branch A, a second branch B and a third branch C, wherein the first branch A comprises coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10 and A11-a12, the second branch B comprises coils B1-B2, B3-B4, B5-B6, B7-B8, B9-B10 and B11-B12, and the third branch C comprises coils C1-C2, C3-C4, C5-C6, C7-C8, C9-C10 and C11-C12; a1-a2, A3-a4, A5-a6, A7-a8, B1-B2, B3-B4, B5-B6, B7-B8, C1-C2, C3-C4, C5-C6, C7-C8 are positioned in the same pair of core slots 3, A9-a10, A11-a12, B9-B10, B11-B12, C9-C10, C11-C12 are positioned in another pair of core slots 3;

the two through slot parts 111 of the coils A1-a2, B1-B2 and C1-C2 are positioned on the 1 st layer in the slot bottom along the slot opening direction in the iron core slot 3, the pitch of the coils B1-B2 and C1-C2 is y-1, the pitch of the coils A1-a2 is y+2, and y is a positive integer.

The pitches of A3-a4, B3-B4 and C3-C4 are y, and two slot penetrating parts 111 of the A3-a4, the B3-B4 and the C3-C4 are respectively positioned on the 2 nd layer and the 3 rd layer of the iron core slot 3;

the pitches of A5-a6, B5-B6 and C5-C6 are y, and two slot penetrating parts 111 of the A5-a6, the B5-B6 and the C5-C6 are respectively positioned at the 4 th layer and the 5 th layer of the iron core slot 3;

the pitch of A7-a8 and C7-C8 is y-1, the pitch of B7-B8 is y+2, and two slot penetrating parts 111 of the three are positioned on the 6 th layer of the iron core slot 3;

the pitches of A9-a10, B9-B10 and C9-C10 are y, and two slot penetrating parts 111 of the A9-a10, the B9-B10 and the C9-C10 are respectively positioned at the 5 th layer and the 4 th layer of the iron core slot 3;

the pitches of A11-a12, B11-B12 and C11-C12 are y, and two slot penetrating parts 111 of the A11-a12, the B11-B12 and the C11-C12 are respectively positioned at the 3 rd layer and the 2 nd layer of the iron core slot 3;

Specifically, taking a motor with 54 slots and 6 poles as an example, the number of layers of the slot coil increases from the slot bottom to the slot coil, namely, a first layer to a sixth layer (in other embodiments, two layers, four layers, eight layers or more layers can be also arranged), and a U-phase winding wiring diagram is shown in fig. 7;

first branch a: a-a, second branch B: B-B, third branch C: C-C. A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12 and the like constitute U-shaped coils, B1-B2, B3-B4, B5-B6, B7-B8, B9-B10, B11-B12 and the like constitute U-shaped coils, and C1-C2, C3-C4, C5-C6, C7-C8, C9-C10, C11-C12 and the like constitute U-shaped coils. A1-a2, B1-B2 and C1-C2 jointly form a sequencing winding, and the structure of the sequencing winding is shown in figure 6. As can be seen from FIG. 7, the pitch of B1-B2 and C1-C2 is 8, the pitch of A1-a2 is 11, and the winding is in the form of a quasi-lap winding, thus achieving the winding commutation. The two sets of sequencing windings are connected by welding ends, and so on.

The 1 st layer and the 6 th layer adopt the sequencing winding, and the 2-3 layers and the 4-5 layers adopt U-shaped coils with the pitch of 9, as shown in figure 7. A specific winding arrangement is shown in fig. 7.

Taking the first branch a as an example, two slot penetrating parts 111 (the two slot penetrating parts 111 are respectively marked as an upper layer side and a lower layer side) of the A1-a2 coil are positioned on the first layer, and the upper layer side and the lower layer side of the A3-a4 coil are respectively positioned on the 2 nd layer and the 3 rd layer; the upper layer side and the lower layer side of the A5-a6 coil are respectively positioned on the 4 th layer and the 5 th layer, the upper layer side and the lower layer side of the A7-a8 coil are both positioned on the 6 th layer, the upper layer side and the lower layer side of the A9-a10 coil are respectively positioned on the 5 th layer and the 4 th layer, the upper layer side and the lower layer side of the A11-a12 coil are respectively positioned on the 3 rd layer and the 2 nd layer, and the upper layer side and the lower layer side of the A13-a14 coil are both positioned on the 1 st layer. The coil connection sequence is alternately connected from layer 1 to layer 6 and then from layer 6 to layer 1, and the cycle is repeated. The other branches are similar to branch 1.

In this embodiment, the number of layers of the coils in the core slot 3 is an even number of layers greater than two, such as four layers, six layers, eight layers, and so on.

The flat wire motor stator has the advantages that the coils are all formed by U-shaped coils, and the opposite coils and the jumper coils are omitted, so that mass production is facilitated; the U-shaped coils with different spans are adopted to form a sequencing winding, and the sequencing winding is used for transposition, so that each branch is completely symmetrical; the U-shaped coil type is reduced, and the mass production and the manufacturing are convenient.

Embodiment two:

fig. 8 shows another embodiment of a flat wire motor stator of the present invention, which is substantially identical to the embodiment, except that: the pitches of the coils located at the innermost layer or the outermost layer are the same. Namely, the coils of the innermost layer or the outermost layer can be of the same type, so that the assembly and mass production are facilitated, and the production efficiency is improved.

In this embodiment, three parallel branches of each set of winding wires are respectively set as a first branch A, a second branch B and a third branch C, wherein the first branch A comprises coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10 and A11-a12, the second branch B comprises coils B1-B2, B3-B4, B5-B6, B7-B8, B9-B10 and B11-B12, and the third branch C comprises coils C1-C2, C3-C4, C5-C6, C7-C8, C9-C10 and C11-C12; a1-a2, A3-a4, A5-a6, A7-a8, B1-B2, B3-B4, B5-B6, B7-B8, C1-C2, C3-C4, C5-C6, C7-C8 are positioned in the same pair of core slots 3, A9-a10, A11-a12, B9-B10, B11-B12, C9-C10, C11-C12 are positioned in another pair of core slots 3;

the two through slot parts 111 of the coils A1-a2, B1-B2 and C1-C2 are positioned on the 1 st layer in the slot bottom of the iron core slot 3 along the slot opening direction, the pitch of the B1-B2 and the C1-C2 is y-1, the pitch of the A1-a2 is y+2, and y is a positive integer;

the pitches of A7-a8, B7-B8 and C7-C8 are y, and two slot penetrating parts 111 of the A7-a8, the B7-B8 and the C7-C8 are positioned on the 6 th layer of the iron core slot 3;

Specifically, taking a motor with 54 slots and 6 poles as an example, the number of the coil layers from the slot bottom to the slot opening increases sequentially, namely, the number of the coil layers from the slot bottom to the sixth layer (in other embodiments, four layers, eight layers or more layers can be also arranged), and a U-phase winding wiring diagram is shown in fig. 8;

first branch a: a-a, second branch B: B-B, third branch C: C-C. A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12 and the like constitute U-shaped coils, B1-B2, B3-B4, B5-B6, B7-B8, B9-B10, B11-B12 and the like constitute U-shaped coils, and C1-C2, C3-C4, C5-C6, C7-C8, C9-C10, C11-C12 and the like constitute U-shaped coils. A1-a2, B1-B2 and C1-C2 jointly form a sequencing winding, and the structure of the sequencing winding is shown in figure 6. As can be seen from FIG. 8, the A1-a2 coil pitch is 11, the B1-B2 and C1-C2 coil pitches are 8, and the winding is replaced by a quasi-lap winding mode. The two sets of sequencing windings are connected by welding ends, and so on.

The 1 st layer or the 6 th layer adopts a sequencing winding, and the 2 nd layer to the 3 rd layer and the 4 th layer to the 5 th layer adopt U-shaped coils with the pitch of 9. If the layer 1 employs a commutation winding, the layer 6 winding employs a U-shaped coil with a pitch of 9, as shown in fig. 8, and vice versa.

Embodiment III:

the flat wire motor stator is substantially the same as that of the first embodiment, except that: the pitch of the commutation windings varies as shown in fig. 9, and fig. 10 shows another embodiment of the flat wire motor stator of the present invention.

the two through slot parts 111 of the coils A1-a2, B1-B2 and C1-C2 are positioned on the 1 st layer in the slot bottom of the iron core slot 3 along the slot opening direction, the pitch of the B1-B2 and the C1-C2 is y+1, the pitch of the A1-a2 is y-2, and y is a positive integer;

the two through slot parts 111 of the coils A7-a8, B7-B8 and C7-C8 are positioned on the 6 th layer in the slot bottom of the iron core slot 3 along the slot opening direction, the pitch of the coils A7-B8 and C7-C8 is y+1, and the pitch of the coils B7-B8 is y-2;

Specifically, taking a motor with 54 slots and 6 poles as an example, the number of the coil layers of the first layer and the sixth layer increases from the slot bottom to the slot opening sequentially, namely, the number of the coil layers of the first layer to the sixth layer (in other embodiments, four layers, eight layers or more layers can be also arranged), and a U-phase winding wiring diagram is shown in fig. 10;

first branch a: a-a, second branch B: B-B, third branch C: C-C. A1-a2, A3-a4, A5-a6, A7-a8, A9-a10, A11-a12 and the like constitute U-shaped coils, B1-B2, B3-B4, B5-B6, B7-B8, B9-B10, B11-B12 and the like constitute U-shaped coils, and C1-C2, C3-C4, C5-C6, C7-C8, C9-C10, C11-C12 and the like constitute U-shaped coils. A1-a2, B1-B2 and C1-C2 jointly form a sequencing winding, and the structure of the sequencing winding is shown in figure 6. As can be seen from FIG. 8, the A1-a2 coil pitch is 7, the B1-B2 and C1-C2 coil pitches are 10, and the winding is replaced by a quasi-lap winding mode. The two sets of sequencing windings are connected by welding ends, and so on.

The 1 st layer and the 6 th layer adopt sequencing windings, as shown in figure 9, the 2 nd layer to the 3 rd layer and the 4 th layer to the 5 th layer adopt U-shaped coils with the pitch of 9; the U-phase winding connection is shown in fig. 10.

Embodiment four:

the flat wire motor stator is basically the same as that of the second embodiment, and differs only in that: the pitch of the commutation windings is different and as shown in figure 9, figure 11 shows another embodiment of the flat wire motor stator of the present invention.

Specifically, taking a motor with 54 slots and 6 poles as an example, the number of the coil layers from the slot bottom to the slot opening increases sequentially, namely, the number of the coil layers from the slot bottom to the sixth layer (in other embodiments, four layers, eight layers or more layers can be also arranged), and a U-phase winding wiring diagram is shown in fig. 11;

Layer 1 or layer 6 employs a commutation winding, as shown in fig. 9; the layers 2-3 and 4-5 adopt U-shaped coils with the pitch of 9. If the layer 1 employs a commutation winding, the layer 6 winding employs a U-shaped coil with a pitch of 9, as shown in fig. 11, and vice versa.

Fifth embodiment:

the flat wire motor of the present embodiment includes the flat wire motor stator of the first embodiment or the second embodiment. The flat wire motor also comprises the flat wire motor stator, has the advantages as the flat wire motor stator, and has the advantages of simple integral structure, small volume and high working stability.

Example six:

the vehicle of the present embodiment includes the flat wire motor of the third embodiment. The vehicle of the invention also comprises a flat wire motor stator as described above, also having the advantages described above for a flat wire motor stator.

While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art, or equivalent embodiments with equivalent variations can be made, without departing from the scope of the invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a flat wire motor stator, includes stator winding (1) and stator core (2), the circumference of stator core (2) is equipped with a plurality of iron core slots (3), stator winding (1) include multiphase winding, its characterized in that: each phase winding comprises one or more groups of winding circuits which are connected in parallel, each group of winding circuits comprises three parallel branches, each branch comprises a plurality of coil groups which are sequentially arranged on circumferential iron core grooves of a stator iron core (2) and are mutually connected in series, and each coil group comprises a plurality of coils which are penetrated in the same pair of iron core grooves (3) and are mutually connected in series; the number of layers of coils in each iron core groove (3) is increased from the groove bottom to the groove opening in sequence, and in each coil group, coils in the middle layer are arranged between two adjacent layers in a crossing manner, and coils in the innermost layer or the outermost layer are positioned in the same layer.

2. The flat wire motor stator of claim 1, wherein: the coil comprises a coil main body (11) and bending parts (12), the coil main body (11) comprises two groove penetrating parts (111) which are arranged in parallel with each other and connecting parts (112) which are connected to one ends of the two groove penetrating parts (111), the bending parts (12) are positioned at the other ends of the two groove penetrating parts (111) and form welding ends, the two groove penetrating parts (111) of the coil positioned in the middle layer are respectively positioned in two adjacent layers, and the two groove penetrating parts (111) of the coil positioned in the innermost layer or the outermost layer are positioned in the same layer.

3. The flat wire motor stator of claim 2, wherein: two bending parts (12) of the coil positioned in the middle layer are respectively bent towards the inner side of the width direction of the coil main body (11).

4. The flat wire motor stator of claim 2, wherein: two bending parts (12) positioned at the innermost layer or the outermost layer coil are bent towards one side of the width direction of the coil main body (11).

5. The flat wire motor stator of claim 2, wherein: the three parallel branches of each winding circuit are respectively set as a first branch A, a second branch B and a third branch C, wherein the first branch A comprises coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10 and A11-a12, the second branch B comprises coils B1-B2, B3-B4, B5-B6, B7-B8, B9-B10 and B11-B12, and the third branch C comprises coils C1-C2, C3-C4, C5-C6, C7-C8, C9-C10 and C11-C12; a1-a2, A3-a4, A5-a6, A7-a8, B1-B2, B3-B4, B5-B6, B7-B8, C1-C2, C3-C4, C5-C6, C7-C8 are positioned in the same pair of iron core slots (3), A9-a10, A11-a12, B9-B10, B11-B12, C9-C10, C11-C12 are positioned in another pair of iron core slots (3);

the two through slot parts (111) of the coils A1-a2, B1-B2 and C1-C2 are positioned on the 1 st layer of the bottom of the inner slot of the iron core slot (3) along the slot opening direction, the pitch of the coils B1-B2 and C1-C2 is y-1, the pitch of the coils A1-a2 is y+2, and y is a positive integer; alternatively, the two slot penetrating parts 111 of the coils A1-a2, B1-B2 and C1-C2 are positioned on the 1 st layer of the inner slot bottom of the iron core slot 3 along the slot opening direction, the pitch of the B1-B2 and the C1-C2 is y+1, the pitch of the A1-a2 is y-2, and y is a positive integer;

the pitches of A3-a4, B3-B4 and C3-C4 are y, and two slot penetrating parts (111) of the A3-a4, the B3-B4 and the C3-C4 are respectively positioned on the 2 nd layer and the 3 rd layer of the iron core slot (3);

the pitches of A5-a6, B5-B6 and C5-C6 are y, and two slot penetrating parts (111) of the A5-a6, the B5-B6 and the C5-C6 are respectively positioned at the 4 th layer and the 5 th layer of the iron core slot (3);

the pitch of A7-a8 and C7-C8 is y-1, the pitch of B7-B8 is y+2, and two slot penetrating parts (111) of the three are positioned on the 6 th layer of the iron core slot (3); or the pitches of A7-a8 and C7-C8 are y+1, the pitch of B7-B8 is y-2, and two slot penetrating parts (111) of the three are positioned on the 6 th layer of the iron core slot (3);

the pitches of A9-a10, B9-B10 and C9-C10 are y, and two slot penetrating parts (111) of the A9-a10, the B9-B10 and the C9-C10 are respectively positioned at the 5 th layer and the 4 th layer of the iron core slot (3);

the pitches of A11-a12, B11-B12 and C11-C12 are y, and two slot penetrating parts (111) of the A11-a12, the B11-B12 and the C11-C12 are respectively positioned at the 3 rd layer and the 2 nd layer of the iron core slot (3);

6. The flat wire motor stator of claim 2, wherein: the pitches of the coils located at the innermost layer or the outermost layer are the same.

7. The flat wire motor stator of claim 6, wherein: the three parallel branches of each group of winding circuits are respectively set as a first branch A, a second branch B and a third branch C, wherein the first branch A comprises coils A1-a2, A3-a4, A5-a6, A7-a8, A9-a10 and A11-a12, the second branch B comprises coils B1-B2, B3-B4, B5-B6, B7-B8, B9-B10 and B11-B12, and the third branch C comprises coils C1-C2, C3-C4, C5-C6, C7-C8, C9-C10 and C11-C12; a1-a2, A3-a4, A5-a6, A7-a8, B1-B2, B3-B4, B5-B6, B7-B8, C1-C2, C3-C4, C5-C6, C7-C8 are positioned in the same pair of iron core slots (3), A9-a10, A11-a12, B9-B10, B11-B12, C9-C10, C11-C12 are positioned in another pair of iron core slots (3);

the pitches of A7-a8, B7-B8 and C7-C8 are y, and two slot penetrating parts (111) of the A7-a8, the B7-B8 and the C7-C8 are all positioned on the 6 th layer of the iron core slot (3);

8. The flat wire motor stator according to any one of claims 1 to 7, wherein: the number of layers of the coils in the iron core groove (3) is an even number layer which is larger than two layers.

9. A flat wire motor, characterized by: a flat wire motor stator comprising the flat wire motor of claim 8.

10. A vehicle, characterized in that: comprising the motor of claim 9.