阅读说明：本技术 一种扁线电枢绕组和电机 (Flat wire armature winding and motor ) 是由 朱标龙 许冬 李鹏 孔勇进 张诗香 庄朝晖 于 2021-09-06 设计创作，主要内容包括：本发明涉及电机,公开了一种扁线电枢绕组,包括定子,定子内开设有若干定子槽,每个定子槽内均设有N层导体,并从导体的第一层至第N层依次层叠嵌有线圈,嵌入的线圈在所述定子槽内形成第一组线圈,再将线圈从第N-1层向第二层依次层叠嵌入相邻定子槽内形成第二组线圈,第一组线圈和第二组线圈间隔排布将每组线圈的焊接端首尾相连,最终形成电枢绕组,其中,N为大于等于4的偶数。通过将发卡线圈在绕组中进行叠绕并对发卡线圈的结构进行设计,以此形成的绕组结构均为短距分布,能有效削弱产生的谐波电动势,改善磁势波形；另一方面,并联的两条支路间电势达到平衡,避免形成环流而产生附加损耗,能有效发挥扁线技术提升电机效率和温升性能的效果。(The invention relates to a motor and discloses a flat wire armature winding, which comprises a stator, wherein a plurality of stator slots are formed in the stator, N layers of conductors are arranged in each stator slot, coils are sequentially laminated and embedded from the first layer to the Nth layer of the conductors, the embedded coils form a first group of coils in the stator slots, the coils are sequentially laminated and embedded into adjacent stator slots from the Nth-1 layer to the Nth layer to form a second group of coils, the first group of coils and the second group of coils are arranged at intervals to connect the welding ends of each group of coils end to end, and finally the armature winding is formed, wherein N is an even number which is more than or equal to 4. The hairpin coils are wound in the windings in an overlapping manner, and the structure of the hairpin coils is designed, so that the formed winding structures are distributed in a short distance, the generated harmonic electromotive force can be effectively weakened, and the magnetic potential waveform is improved; on the other hand, the potential between the two parallel branches is balanced, so that additional loss caused by the formation of a circulating current is avoided, and the effect of improving the motor efficiency and the temperature rise performance by the flat wire technology can be effectively exerted.)

1. The flat wire armature winding is characterized by comprising a stator (1), wherein a plurality of stator slots are formed in the stator (1), N layers of coil embedding layers are arranged in each stator slot, coils are sequentially embedded from the first layer to the Nth layer of each coil embedding layer in the corresponding stator slot, the coils are embedded into the stator slots to form a first group of coils, the coils are sequentially embedded into the stator slots from the Nth-1 th layer to the Nth layer to form a second group of coils, the first group of coils and the second group of coils are arranged at intervals, and the welding ends of the coils are connected end to form the armature winding, wherein N is an even number which is more than or equal to 4.

2. The flat wire armature winding of claim 1, wherein the armature winding has at least two branches in a parallel configuration, and under the same branch, the coils of the first layer and the Nth layer cross in the same layer, and the coils of the second layer to the Nth-1 layer cross in different layers.

3. The flat wire armature winding of claim 1, wherein the number of stator slots is 48, the number of motor poles is 8, the number of coil embedded layers in each stator slot is the number of conductors, and the number of conductors is 8.

4. The flat wire armature winding according to claim 1, wherein the coils of the same-phase overline are arranged at intervals, and the coils of different-phase overlines are arranged continuously.

5. The flat wire armature winding of claim 4, wherein the different layer flying leads are flying leads between adjacent layers of the armature winding, and the span from the armature winding of the second layer to the coil of the (N-1) th layer is 8 or less.

6. The flat wire armature winding of claim 1, wherein the armature winding is one of three phase windings, and the remaining two phase windings are obtained by rotating the phase winding around the inner circumference of the stator slot.

7. The flat wire armature winding according to claim 1, characterized in that the coils of the armature winding are made of flat wire and respectively form a first hairpin coil (2), a second hairpin coil (3) and a third hairpin coil (4) structure.

8. The flat wire armature winding according to claim 7, wherein the two welded ends of the first hairpin coil (2) are twisted toward the inside of the coil structure to form a hexagonal frame structure, and the ends of the two welded ends of the first hairpin coil (2) are bent outward, the two welded ends of the second hairpin coil (3) and the third hairpin coil (4) are bent toward the same side, and the welded ends of the second hairpin coil (3) and the third hairpin coil (4) are bent in opposite directions and are bent in parallel with each other.

9. The flat wire armature winding according to claim 8, wherein each branch of the armature winding includes 24 first-number hairpin coils (2), 4 second-number hairpin coils (3), and 4 third-number hairpin coils (4), wherein in one branch, the third-number hairpin coils (4) are initially crossed at the first layer by a span of 7 layers, then the first-number hairpin coils (2) are crossed from the second layer by a span of 6 to the third layer, then the first-number hairpin coils (2) are crossed at the fourth layer by a span of 7 to the fifth layer, then the first-number hairpin coils (2) are crossed at the sixth layer by a span of 6 to the seventh layer, then the second-number hairpin coils (3) are crossed at the eighth layer by a span of 6 layers, then the first-number hairpin coils (2) are crossed at the seventh layer by a span of 6 to the sixth layer, then the first-number hairpin coils (2) are crossed at the seventh layer of the next pole by a span of 6 to the sixth layer, then the first hairpin coil (2) spans from the third layer to the second layer at a span 6, then the third hairpin coil (4) spans the same layer at a span 5 at the first layer, then the first hairpin coil (2) spans from the second layer to the third layer at a span 6, then the first hairpin coil (2) spans from the fourth layer to the fifth layer at a span 7, then the first hairpin coil (2) spans from the sixth layer to the seventh layer at a span 6, then the second hairpin coil (3) spans the same layer at the eighth layer at a span 6, then the first hairpin coil (2) spans from the seventh layer to the sixth layer at a span 6, then the first hairpin coil (2) spans from the fifth layer to the fourth layer at a span 7, then the first hairpin coil (2) spans from the third layer to the second layer at a span 6, and so on until the last hairpin coil (2) returns to the last first hairpin coil.

10. An electrical machine comprising a flat wire armature winding according to any of claims 1 to 9.

Technical Field

The invention relates to a motor, in particular to a flat wire armature winding. The invention further relates to an electric machine.

Background

With the rapid development of new energy automobile technology, the performance requirement on the automobile driving motor is higher and higher, the main development trend of the new energy automobile motor is miniaturization and high-speed, and the miniaturization necessarily requires the motor efficiency to be greatly improved.

Because the flat wire motor can obviously improve the slot filling rate and the motor efficiency of the motor, more and more flat wire motors are applied to a new energy automobile driving system, most of the existing motors using flat wires are full-pitch wave winding windings, for example, a three-phase flat wire motor stator winding disclosed in Chinese patent with publication number CN209881519U, published as 2019.12.31, in the patent, a three-phase flat wire stator winding is adopted, 48 stator slots are equidistantly arranged in each phase winding, 8 layers of conductors are arranged in each flat wire stator winding slot, the layers are respectively a-h layers, the pitch of each layer of winding is 6, each phase winding structure is provided with two branches, the two branches are connected in series, each layer of winding adopts the same pitch for winding, taking one group of stator winding slots as an example, the winding starts from the stator slot 8-a and then falls into the stator slot 14-b, winding from the stator slot 14-b, falling into the stator slot 20-a, winding from the stator slot 20-a, falling into the stator slot 26-b, winding from the stator slot 26-b, falling into the stator slot 32-a, winding from the stator slot 32-4, falling into the stator slot 38-b, winding from the stator slot 38-b, falling into the stator slot 44-a, and falling from 44-a into the lower two layers of stator slots 8-c, thereby completing a cycle of winding, wherein the winding mode in the rest conductors is performed by adopting the winding method, and when the winding in the last conductor is completed, the winding operation of the same phase coil in the group is completed.

However, the winding method using the full pitch winding has large potential harmonics of 5 th order and 7 th order, and is liable to cause problems such as vibration noise and additional harmonic loss.

Disclosure of Invention

The invention aims to provide a flat wire armature winding which can realize short-distance distribution to weaken potential harmonics of 5 th order and 7 th order and further improve the problems of vibration noise and harmonic loss caused by the harmonics. In addition, the two parallel branches of the armature winding are balanced in potential, so that additional loss caused by the generation of circulation current can be avoided, and the motor efficiency is improved. Meanwhile, the armature winding is simple and compact in structure, good in process manufacturability and suitable for batch application.

The invention provides a flat wire armature winding, which comprises a stator, wherein a plurality of stator slots are formed in the stator, N layers of coil embedding layers are arranged in each stator slot, coils are sequentially embedded from the first layer to the Nth layer of the coil embedding layers in one stator slot in a stacking mode, the embedded coils form a first group of coils in the stator slots, the coils are sequentially embedded from the Nth-1 th layer to the Nth layer in the adjacent stator slots in a stacking mode to form a second group of coils, the first group of coils and the second group of coils are arranged at intervals, and the welding ends of each group of coils are connected end to form the armature winding, wherein N is an even number which is more than or equal to 4.

Preferably, the armature winding has at least two branches in a parallel structure, and under the same branch, the coils of the first layer and the nth layer cross in the same layer, and the coils of the second layer to the nth-1 layer cross in different layers. The two parallel branches are arranged, the hairpin coils at the innermost layer and the outermost layer are arranged to be the same-layer overline, and the hairpin coil at the middle layer is arranged to be the different-layer overline, so that the potential balance between the two branches is realized, and the additional loss caused by the generation of circulation is avoided.

Further preferably, the number of the stator slots is 48, the number of the motor poles is 8, and the number of the conductors in each stator slot is 8.

Preferably, in the armature winding of the same phase, the coils of the same-layer overline are arranged at intervals, and the coils of different-layer overlines are arranged continuously.

Preferably, the different-layer overline is an overline between adjacent layers of the armature winding, and the span from the armature winding of the second layer to the coil of the (N-1) th layer is less than or equal to 8.

Further preferably, the armature winding is one of three-phase windings, and the other two-phase winding is obtained by rotating the phase winding in the inner circumference of the stator slot.

Preferably, the coils of the armature winding are made of flat wires and respectively form a first hairpin coil structure, a second hairpin coil structure and a third hairpin coil structure. The flat wire hairpin coil is used for winding, so that the contact area between the winding coils is larger, the heat dissipation and heat conduction performance is better, the stress of the flat wire coil is larger, the rigidity is larger, the armature has better rigidity integrally, and the noise generated by the armature winding is inhibited.

Further preferably, two welding ends of the first hairpin coil are bent towards the inner side of the coil structure, so that a hexagonal frame structure is formed, the end heads of the two welding ends of the first hairpin coil are bent towards the outer side, the two welding ends of the second hairpin coil and the two welding ends of the third hairpin coil are bent towards the same side, the welding ends of the second hairpin coil and the welding ends of the third hairpin coil are bent in opposite directions, and the bent parts are parallel to each other. The existing flat wire hairpin is improved, the size of the end part is reduced, so that the size of the whole system is further reduced, fewer hairpin types are adopted, the difficulty of assembly is reduced, and the assembly efficiency is improved.

Preferably, each branch of the armature winding includes 24 first-number hairpin coils, 4 second-number hairpin coils, and 4 third-number hairpin coils, wherein in one branch, the third-number hairpin coil spans the same layer at a span of 7 in the first layer, then the first-number hairpin coil spans the same layer at a span of 6 from the second layer to the third layer, then the first-number hairpin coil spans the fourth layer at a span of 7 to the fifth layer, then the first-number hairpin coil spans the sixth layer at a span of 6 to the seventh layer, then the second-number hairpin coil spans the same layer at a span of 6 in the eighth layer, then the first-number hairpin coil spans the seventh layer at a span of 6 to the sixth layer, then the first-number hairpin coil spans the fifth layer at a span of 7 to the fourth layer, then the first-number hairpin coil spans the third layer at a span of 6 to the second layer, then the third-number hairpin coil spans the same layer at a span of 5 in the first layer, then the first hairpin coil crosses from the second floor to the third floor at span 6, then the first hairpin coil crosses from the fourth floor to the fifth floor at span 7, then the first hairpin coil crosses from the sixth floor to the seventh floor at span 6, then the second hairpin coil crosses from the eighth floor to the same floor at span 6, then the first hairpin coil crosses from the seventh floor of the next pole to the sixth floor at span 6, then the first hairpin coil crosses from the fifth floor to the fourth floor at span 7, then the first hairpin coil crosses from the third floor to the second floor at span 6, and so on until the last first hairpin coil is returned.

The invention also provides an electrical machine comprising a flat wire armature winding according to any of claims 1 to 9.

According to the technical scheme, on one hand, the hairpin coil is wound from the first layer to the last layer of the stator slot, then the hairpin coil is wound from the penultimate layer of the adjacent stator slot to the second layer, and winding structures formed by analogy are distributed in short distance, so that generated harmonic electromotive force can be effectively weakened, and the magnetic potential waveform is improved; on the other hand, the potential between the two parallel branches in the same phase winding is balanced, so that the additional loss caused by the generation of circulation is avoided, and the effect of improving the motor efficiency and the temperature rise performance by the flat wire technology can be effectively exerted.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

FIG. 1 is a schematic diagram of an armature winding structure employed in the present invention;

FIG. 2 is a diagram of the conductor distribution within the winding slot of the present invention;

FIG. 3a is a schematic view of a first card-issuing coil used in the present invention;

FIG. 3b is a schematic structural diagram of a second hairpin coil used in the present invention;

FIG. 3c is a schematic structural diagram of a third hairpin coil used in the present invention;

FIG. 4 is a schematic diagram of a hairpin used in the prior art of the present invention;

FIG. 5 is a prior art winding layout diagram of a phase winding slot under a pair of poles;

FIG. 6 is a diagram of a first branch winding according to the prior art;

fig. 7 is a diagram of the winding pattern in a slot for a phase winding under a pair of poles in accordance with a first embodiment of the present invention;

fig. 8 is a diagram of a first branch winding according to the first embodiment of the present invention;

fig. 9 is a second branch winding diagram in the first embodiment of the present invention;

fig. 10 is a diagram of the winding pattern in a slot for a phase winding under a pair of poles in accordance with a second embodiment of the present invention;

FIG. 11 is a diagram of a first branch winding in a second embodiment of the present invention;

fig. 12 is a second branch winding diagram according to a second embodiment of the present invention.

Reference numerals

1 stator 2 number hairpin coil

3 # hairpin coil 4 # hairpin coil

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, and for example, the term "connected" may be a fixed connection, a detachable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1, the flat wire armature winding of the present invention includes a stator, wherein a plurality of stator slots are formed in the stator 1, N coil embedding layers are formed in each stator slot, coils are sequentially embedded in a stack from a first layer to an nth layer of the coil embedding layers, the embedded coils form a first group of coils in the stator slots, the coils are sequentially embedded in a stack from the nth-1 layer to the nth layer to form a second group of coils, the first group of coils and the second group of coils are arranged at intervals to connect the welding ends of each group of coils end to end, and finally form the armature winding, wherein N is an even number greater than or equal to 4.

Fig. 2 is a conductor distribution diagram in a stator slot adopted in the present invention, wherein each stator slot is provided with 8 layers of conductors, where "a", b, c, … g, and h denote the number of conductors in each stator slot, and sequentially leave the center of the armature winding along the radial direction, and the coil is embedded from the a layer of conductor to the h layer of conductor.

As shown in fig. 3a, which is a schematic structural diagram of the first hairpin coil 2 adopted by the present invention, each coil is made of a flat wire, and the flat wire is shaped to form a hairpin-shaped structure, two welding ends of the hairpin structure are integrally bent toward the inside of the hairpin, at the ends of the welding ends, two ends are bent toward the outside of the hairpin, and the two bent ends are relatively parallel to each other.

Fig. 3b and fig. 3c are schematic structural diagrams of a second hairpin coil 3 and a third hairpin coil 4 adopted by the present invention, respectively, wherein the second hairpin coil 3 and the third hairpin coil 4 are similarly shaped by using a flat wire and are made into hairpin-shaped structures, in order to facilitate assembly of the coils, two welding ends of the second hairpin coil 3 are bent to the same side, similarly, two welding ends of the third hairpin coil 4 are also bent to the same side, and the bending directions of the second hairpin coil 3 and the third hairpin coil 4 are opposite, that is, if the welding end of the second hairpin coil 3 is bent to the left, the welding end of the third hairpin coil 4 is bent to the right, so as to adapt to the winding rule adopted by the present invention.

Specifically, on the premise that the space in the winding is not changed, the first hairpin coil 2, the second hairpin coil 3 and the third hairpin coil 4 are combined for winding, and the first hairpin coil 2, the second hairpin coil 3 and the third hairpin coil 4 are manufactured by adopting flat wires and wound, so that the formed winding can reach higher slot fullness rate, copper filled in a winding slot can be remarkably improved, stronger magnetic field intensity is generated, and the increased power is equivalent to a certain degree; the contact area between the coils made of the flat wires is larger, the heat dissipation and heat conduction performance is better, the stress of the flat wire coils is larger, and the rigidity is higher, so that the whole armature has better rigidity, and the noise generated by an armature winding is restrained; in addition, for the flat wire motor, because the flat wire coils are all hard wires, the sizes of the end parts of the first hairpin coil 2, the second hairpin coil 3 and the third hairpin coil 4 can be reduced in the processing process, so that the space in the whole winding is reduced, the whole volume is reduced, and the motor is miniaturized and lightened.

In the prior art, the distribution of U-phase windings is shown in fig. 4 to 5, fig. 4 is a flat wire hairpin used for U-phase winding distribution, two welding ends of the flat wire hairpin are bent outwards to form a funnel-shaped open structure with a closed bottom, the flat wire hairpin is embedded into a stator slot, the distribution of the flat wire hairpin in a pair of under-pole U-phase winding slots is shown in fig. 5, 8 layers of conductors are arranged in each winding slot, and the flat wire hairpins are uniformly embedded into each layer of conductors at the same pitch, so that a final winding structure is formed.

Specifically, as shown in fig. 6, 48 stator slots are provided in the winding structure, the 48 stator slots are numbered in the order of 1 to 48, each stator slot is generally configured as a rectangular slot, and 8 layers of conductors are provided in each stator slot, and the first branch winding path of the winding structure is as follows: the coil is inserted first from the first layer of the No. 8 stator slot (the layer closest to the outer circumferential surface of the stator slot 1 is defined as the first layer), then straddles the second layer of the No. 14 stator slot at a normal pitch, then straddles the first layer of the No. 20 stator slot at a normal pitch, then straddles the second layer of the No. 26 stator slot at a normal pitch, then straddles the first layer of the No. 32 stator slot at a normal pitch, then straddles the second layer of the No. 38 stator slot at a normal pitch, then straddles the first layer of the No. 44 stator slot at a normal pitch, then straddles the second layer of the No. 2 stator slot at a normal pitch, then straddles the third layer of the No. 8 stator slot at a normal pitch, then straddles the fourth layer of the No. 14 stator slot at a normal pitch, then straddles the third layer of the No. 20 stator slot at a normal pitch, then straddles the fourth layer of the No. 26 stator slot at a normal pitch, then straddles the third layer of the No. 32 stator slot at a normal pitch, then straddling a fourth layer of the stator slot No. 38 at a normal pitch, then straddling a third layer of the stator slot No. 44 at a normal pitch, then straddling a fourth layer of the stator slot No. 2 at a normal pitch, then straddling a fifth layer of the stator slot No. 8 at a normal pitch, then straddling a sixth layer of the stator slot No. 14 at a normal pitch, then straddling a fifth layer of the stator slot No. 20 at a normal pitch, then straddling a sixth layer of the stator slot No. 26 at a normal pitch, then straddling a fifth layer of the stator slot No. 32 at a normal pitch, then straddling a sixth layer of the stator slot No. 38 at a normal pitch, then straddling a fifth layer of the stator slot No. 44 at a normal pitch, then straddling a sixth layer of the stator slot No. 2 at a normal pitch, then straddling a seventh layer of the stator slot No. 8 at a normal pitch, then straddling an eighth layer of the stator slot No. 14 at a normal pitch, then straddling a seventh layer of the stator slot No. 20 at a normal pitch, then straddling the eighth layer of the 26 # stator groove at the normal pitch, then straddling the seventh layer of the 32 # stator groove at the normal pitch, then straddling the eighth layer of the 38 # stator groove at the normal pitch, then straddling the seventh layer of the 44 # stator groove at the normal pitch, then straddling the eighth layer of the 2 # stator groove at the normal pitch, then straddling the eighth layer of the 9 # stator groove at the 7 pitch, then straddling the seventh layer of the 3 # stator groove at the normal pitch, then straddling the eighth layer of the 45 # stator groove at the normal pitch, then straddling the seventh layer of the 39 # stator groove at the normal pitch, then straddling the eighth layer of the 33 # stator groove at the normal pitch, then straddling the seventh layer of the 27 # stator groove at the normal pitch, then straddling the eighth layer of the 21 # stator groove at the normal pitch, then straddling the seventh layer of the 15 # stator groove at the normal pitch, then straddling the sixth layer of the 9 # stator groove at the normal pitch, and the rest can be done, the winding work of the first branch is finished until the first layer of the No. 15 stator slot, and the rest can be done.

Therefore, all coils from the first layer of hairpin winding to the eighth layer of hairpin winding are wound in a pitch wave winding mode and are all different-layer overlines, but when the coils are wound back from the eighth layer to the first layer, the same-layer overlines are adopted at the joint, and the pitch is slightly larger than the normal pitch, so that the height of the welded end part is obviously increased, and after the pitch winding is adopted, the electromotive force harmonic is larger, and the problems of vibration noise, additional harmonic loss and the like are easily caused.

In the first embodiment of the flat wire armature winding according to the present invention, as shown in fig. 7 to 9, each phase winding includes two parallel branches, the input terminals of the two parallel branches are U +, the output terminal is U-, and the winding method of the first branch of the U-phase winding is adopted: as shown in fig. 8, first, using hairpin coil No. 4 to be inserted from the first layer of stator slot No. 24, then stepping into the first layer of stator slot No. 31 with 7 pitches, then switching to hairpin coil No. 2 to step into the second layer of stator slot No. 25 with 6 pitches, then stepping into the third layer of stator slot No. 31 with 6 pitches, then stepping into the fourth layer of stator slot No. 25 with 6 pitches, then stepping into the fifth layer of stator slot No. 32 with 7 pitches, then stepping into the sixth layer of stator slot No. 26 with 6 pitches, then stepping into the seventh layer of stator slot No. 32 with 6 pitches, then stepping into the eighth layer of stator slot No. 26 with 6 pitches, then switching to the same-layer stepping of hairpin coil No. 3 with 6 pitches, stepping into the eighth layer of stator slot No. 32, completing the coil arrangement in a set of stator slots, then winding the coil arrangement from the eighth layer to the first layer, stepping the coil in the eighth layer of stator slot No. 32 to the next stage, the arrangement sequence is as follows: and switching to form the first hairpin coil 2 to stride into the seventh layer of the 38 th stator slot at the 6-pitch, then stride into the sixth layer of the 32 th stator slot at the 6-pitch, then stride into the fifth layer of the 38 th stator slot at the 6-pitch, then stride into the fourth layer of the 31 th stator slot at the 7-pitch, then stride into the third layer of the 37 th stator slot at the 6-pitch, then stride into the second layer of the 31 th stator slot at the 6-pitch, then stride into the first layer of the 37 th stator slot in the next stage at the 6-pitch, and so on, according to the winding rule, continuously winding from the first layer to the eighth layer of one winding, then stride into the next stage, winding from the eighth layer to the first layer, and continuously repeating, and finally completing the winding of the first branch.

The winding mode of the second branch of the U-phase winding is as follows: as shown in fig. 9, first, using hairpin coil No. 4, from the first layer of stator slot No. 25, then striding 5 pitches into the first layer of stator slot No. 30, then switching to hairpin coil No. 2 striding 6 pitches into the second layer of stator slot No. 24, then striding 6 pitches into the third layer of stator slot No. 30, then striding 6 pitches into the fourth layer of stator slot No. 24, then striding 7 pitches into the fifth layer of stator slot No. 31, then striding 6 pitches into the sixth layer of stator slot No. 25, then striding 6 pitches into the seventh layer of stator slot No. 31, then striding 6 pitches into the eighth layer of stator slot No. 25, then switching to hairpin coil No. 3 striding lines, striding 6 pitches into the eighth layer of stator slot No. 31, then switching to hairpin coil No. 2 striding 6 pitches into the seventh layer of stator slot No. 37 of the next stage, striding 6 pitches into the sixth layer of stator slot No. 31, then strides into the fifth layer of the No. 37 stator slot with 6 pitch, then strides into the fourth layer of the No. 30 stator slot with 7 pitch, then strides into the third layer of the No. 36 stator slot with 6 pitch, then strides into the second layer of the No. 30 stator slot with 6 pitch, then strides into the first layer of the No. 36 stator slot in the next stage with 6 pitch, and so on, and completes the winding of the second branch.

A second embodiment of the flat wire armature winding according to the present invention, as shown in fig. 10 to 12, adjusts the arrangement in the previous embodiment, so as to obtain a new winding structure, wherein the winding manner of the first branch of the U-phase winding is as follows: as shown in fig. 11, first, using hairpin coil No. 4, from the first layer of stator slot No. 26, then straddling the first layer of stator slot No. 32 with 6 pitches, then switching to hairpin coil No. 2 straddling the second layer of stator slot No. 25 with 6 pitches, then straddling the third layer of stator slot No. 31 with 6 pitches, then straddling the fourth layer of stator slot No. 24 with 7 pitches, then straddling the fifth layer of stator slot No. 32 with 8 pitches, then straddling the sixth layer of stator slot No. 25 with 7 pitches, then straddling the seventh layer of stator slot No. 31 with 6 pitches, then straddling the eighth layer of stator slot No. 24 with 7 pitches, then switching to hairpin coil No. 3 straddling the eighth layer of stator slot No. 30 with 6 pitches, then switching to hairpin coil No. 2 straddling the seventh layer of stator slot No. 37 with 7 pitches, then straddling the sixth layer of stator slot No. 31 with 6 pitches, then strides into the fifth layer of the 38 stator slots with 7 pitches, then strides into the fourth layer of the 30 stator slots with 8 pitches, then strides into the third layer of the 37 stator slots with 7 pitches, then strides into the second layer of the 31 stator slots with 6 pitches, then strides into the first layer of the 38 stator slots in the next stage with 7 pitches, and so on, and completes the winding of the first branch.

The winding mode of the second branch of the U-phase winding is as follows: as shown in fig. 12, first, using hairpin coil No. 4, from the first layer of stator slot No. 25, then straddling the first layer of stator slot No. 31 with 6 pitches, then switching to hairpin coil No. 2 straddling the second layer of stator slot No. 24 with 7 pitches, then straddling the third layer of stator slot No. 32 with 8 pitches, then straddling the fourth layer of stator slot No. 25 with 7 pitches, then straddling the fifth layer of stator slot No. 31 with 6 pitches, then straddling the sixth layer of stator slot No. 24 with 7 pitches, then straddling the seventh layer of stator slot No. 32 with 8 pitches, then straddling the eighth layer of stator slot No. 25 with 7 pitches, then switching to hairpin coil No. 3 straddling the eighth layer of stator slot No. 31 with 6 pitches, then switching to hairpin coil No. 2 straddling the seventh layer of stator slot No. 38 with 7 pitches, next layer of stator slot No. 30 with 8 pitches, then strides into the fifth layer of the No. 37 stator slot with 7 pitches, then strides into the fourth layer of the No. 31 stator slot with 6 pitches, then strides into the third layer of the No. 38 stator slot with 7 pitches, then strides into the second layer of the No. 30 stator slot with 8 pitches, then strides into the first layer of the No. 37 stator slot in the next stage with 7 pitches, and so on, and completes the winding of the second branch.

In one embodiment of the flat wire armature winding of the present invention, the same phase armature winding has at least the following winding rule: 1. starting with a coil of the same-layer overline, the coil of the same-layer overline of the first layer and the coil of the same-layer overline of the 8 th layer are both arranged at intervals, and the coils of the different-layer overlines are continuously arranged, namely, one coil in the adjacent coil of one different-layer overline is inevitably a different-layer overline; 2. the number of layers in which adjacent coils are located is continuously changed back and forth, and the layers are repeated once in the first layer and the eighth layer, respectively, to realize the layer interlining, i.e., the interlining is performed according to the changing rule of 2 → 3 → 4 → 5 → 6 → 7 → 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 1 … from the second layer. Because the invention adopts two parallel flat wire windings, in the winding structure, the potential between the two branches is balanced, thereby avoiding generating circulation current to increase additional loss, improving the efficiency and the temperature rise performance of the motor, and adopting the lap winding and improving the structure of the lap winding coil, on one hand, realizing the short-distance distribution of the flat wire lap winding, thereby effectively weakening harmonic electromotive force, improving the magnetic potential waveform, reducing the additional loss caused by harmonic wave and improving the motion noise generated when the winding works; on the other hand, the novel coil structure is adopted, so that the distance between the first hairpin coil 2, the second hairpin coil 3 and the third hairpin coil 4 is smaller during welding, and only spot welding is needed, so that the connection between the adjacent coils is simpler and more convenient, and the production efficiency can be improved; in addition, due to the fact that the regularity of the winding mode is strong, the error of winding can be effectively prevented.

In addition, although the embodiment adopted by the invention is the rectangular wire armature winding with 8 layers, in the specific implementation process, the winding of the rectangular wire armature winding with even layers such as 4, 6, 10, 12 and the like can be realized by deleting or increasing the number of layers of different-layer overwires, so that the winding method adopted by the invention and the hairpin coil matched with the winding method are not limited to the winding of the rectangular wire armature winding with 8 layers.

The motor is a three-phase motor with the number of poles being 8 and the number of stator slots being 48, comprises the flat wire armature winding in the embodiment of the flat wire armature winding, and at least has the beneficial effects brought by the technical scheme of the corresponding embodiment of the flat wire armature winding.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an implementation," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present disclosure, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the present invention, many simple modifications may be made to the technical solution of the present invention, including modifications to the number of layers N equal to or greater than 4 even, and each specific technical feature may be combined in any suitable way, and in order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.