A hairpin type flat wire short-pitch lap winding armature winding and motor

Abstract

The application provides a hairpin type flat wire short-distance stacked armature winding and a motor. The winding comprises a U phase, a V phase and a W phase three-phase parallel flat wire cooperating with a hairpin to obtain a ring-shaped stator with n layers of 72 stator slot positions; the U phase winding comprises four parallel branches, and the four branches are respectively wound along the n-1 direction in a circular spiral from four starting points on the n layer to the 1 layer in a reciprocating manner, and then are wound along the n+1 direction in a circular spiral from the 1 layer to the n layer in a reciprocating manner, and then are wound to the four ending points on the n layer in a reciprocating manner between the n layer and the 1 layer to form a ring-shaped loop; the V phase winding and the W phase winding are respectively rotated by 8 and 16 slot positions relative to the U phase winding in the direction in which the slot positions increase. The winding is beneficial to the improvement of the slot fill factor of the motor, generates a higher magnetic field strength, improves the motor power, balances the potential of each branch, and does not have a circulating current problem.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a hairpin type short-pitch lap-wound armature winding and electric machine. BACKGROUND

[0002] In the technical field of electric machines, the effective part of the armature winding is mainly located in the slot, and the two ends of the winding are mainly used for connecting the conductors in the slot, and the length thereof should be as short as possible. For the flat wire electric machine widely used in new energy vehicles, with the increasing requirements for efficiency and cost, it is particularly important to reduce the height of the winding end. The reduction of the end height not only effectively saves the copper consumption of the electric machine, but also reduces the direct current resistance of the winding, thereby reducing the copper loss and improving the efficiency of the electric machine.

[0003] However, the current short-pitch winding design of the flat wire electric machine has obvious defects. The common short-pitch implementation method is to change the span of the hairpin end or the twisted head end of the middle layer, or to increase (or decrease) the span at each layer hairpin end, while reducing (or increasing) the span at the welding end. However, the main span of these methods is still based on the normal full-pitch winding span, which cannot effectively reduce the end height, and it is also difficult to achieve the goal of reducing the cost and improving the efficiency of the electric machine.

[0004] In addition, for a 72-slot 6-pole 4-branch electric machine, due to the large number of branches, it is difficult to achieve balance between the winding branches when using short-pitch design. This will cause branch circulating current between the branches, thereby reducing the efficiency of the electric machine. The existing technology is not effective in solving these problems, and cannot meet the demand for high-efficiency and low-cost electric machines in new energy vehicles. SUMMARY

[0005] Based on the above description, the present application provides a hairpin type short-pitch lap-wound armature winding and electric machine, which solves the technical problems that the existing short-pitch winding technology of the flat wire electric machine cannot effectively reduce the end height to save the copper consumption and improve the efficiency, and it is difficult to achieve branch balance in a multi-branch electric machine, resulting in branch circulating current and reducing the efficiency of the electric machine.

[0006] The technical solution of the present application to solve the above technical problems is as follows:

[0007] In a first aspect, the present application provides a hairpin type short-pitch lap-wound armature winding, comprising: a U-phase, a V-phase and a W-phase three-phase parallel flat wire cooperating with a hairpin through-wound inner side having n layers of 72 stator slot positions of a ring-shaped stator.

[0008] The U-phase winding includes four parallel branches. The first, second, third, and fourth branches are formed by flat wires starting from the first, second, third, and fourth starting points of the nth layer, respectively, and spiraling back and forth in a circular spiral along the direction of n-1, reaching the 1st layer. Then, from the 1st layer, they spiral back and forth in a circular spiral along the direction of n+1, reaching the nth layer. After spiraling back and forth between the nth and 1st layers, they reach the first, second, third, and fourth ending points of the (n-1)th layer, forming a loop. Here, n is an even number of layers, the nth layer is the outermost layer, and the 1st layer is the innermost layer.

[0009] The hairpins in the first branch, the second branch, the third branch, and the fourth branch are connected in the same way, and every two points in each branch are considered as a pair.

[0010] Among them, the span of the nth layer of hairpins is 9 slots, 10 slots or 11 slots, the span of the 1st layer of hairpins is 14 slots, and the span of the remaining layers of hairpins is 11 slots.

[0011] The V-phase winding is obtained by rotating the U-phase winding by 8 slots relative to it in the direction of increasing slot size;

[0012] The W-phase winding is obtained by rotating the U-phase winding 16 slots relative to it in the direction of increasing slot size.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, when using a three-phase parallel two-branch flat wire with a hairpin to wind through 10 layers and 72 slots, the number of poles is 6 and the number of branches is 4; define xy as the y-th layer of the x-th slot, where x∈[1,72], y∈[a,j], j, where a is the 1st layer and located inside the slot, and j is the 10th layer and located outside the slot;

[0015] The first branch of the U-phase winding, with point 39j as the initial current inflow point, starts from point 39j located in the 10th layer and spirals back and forth in a circular motion into the slot to the 9th layer, then spirals back and forth in a circular motion into the slot from the 8th layer to the 7th layer, then spirals back and forth in a circular motion from the 6th layer to the 5th layer, then spirals back and forth in a circular motion from the 4th layer to the 3rd layer, then spirals back and forth in a circular motion from the 2nd layer to the 1st layer; then spirals back and forth in a circular motion from the 1st layer... The current flows in reverse order, spiraling outwards from the trough to the 2nd layer, then spiraling outwards from the 3rd layer to the 4th layer, then spiraling outwards from the 5th layer to the 6th layer, then spiraling outwards from the 7th layer to the 8th layer, then spiraling outwards from the 9th layer to the 10th layer. After spiraling outwards from the 10th layer to the 1st layer, the current reaches 28i located on the 9th layer, with 28i serving as the final outlet point of the current.

[0016] Further, define U1+ as the initial inflow point of the first branch current on the U phase, U1- as the final outflow point of the first branch current on the U phase, and the linking route of the first branch of the U phase winding from U1+ to U1- as:

[0017] 39j→ 49j→ 38i→ 49h→ 38g→ 49f→ 38e→ 49d→ 38c→ 49b→ 38a→ 52a→ 63b→ 52c→ 63d→ 52e→ 63f→ 52g→ 63h→ 52i→ 63j→ 2j→ 63i→ 2h→ 63g→ 2f→ 63e→ 2d→ 63c→ 2b→ 63a→ 5a→ 16b→ 5c→ 16d→ 5e→ 16f→ 5g→ 16h→ 5i→ 16j→ 25j→ 14i→ 25h→ 14g→ 25f→ 14e→ 25d→ 14c→ 25b→ 14a→ 28a→ 39b→ 28c→ 39d→ 28e→ 39f→ 28g→ 39h→ 28i.

[0018] Further, the second branch of the U phase winding takes 40j as the initial inflow point of the current and 29i as the final outflow point of the current;

[0019] The third branch of the U phase winding takes 37j as the initial inflow point of the current and 26i as the final outflow point of the current;

[0020] The fourth branch of the U phase winding takes 38j as the initial inflow point of the current and 27i as the final outflow point of the current.

[0021] Further, define U2+ as the initial inflow point of the second branch current on the U phase, U2- as the final outflow point of the second branch current on the U phase, and the linking route of the second branch of the U phase winding from U2+ to U2- as:

[0022] 40j→ 50j→ 39i→ 50h→ 39g→ 50f→ 39e→ 50d→ 39c→ 50b→ 39a→ 53a→ 64b→ 53c→ 64d→ 53e→ 64f→ 53g→ 64h→ 53i→ 64j→ 3j→ 64i→ 3h→ 64g→ 3f→ 64e→ 3d→ 64c→ 3b→ 64a→ 6a→ 17b→ 6c→ 17d→ 6e→ 17f→ 6g→ 17h→ 6i→ 17j→ 26j→ 15i→ 26h→ 15g→ 26f→ 15e→ 26d→ 15c→ 26b→ 15a→ 29a→ 40b→ 29c→ 40d→ 29e→ 40f→ 29g→ 40h→ 29i.

[0023] Further, define U3+ as the initial inflow point of the third branch current on the U phase, U3- as the final outflow point of the third branch current on the U phase, and the linking route of the third branch of the U phase winding from U3+ to U3- as:

[0024] 37j→47j→36i→47h→36g→47f→36e→47d→36c→47b→36a→51a→62b→51c→62d→51e→62f→51g→62h→51i→62j→1j→62i→1h→62g→1f→62e→1d→62c→1b→62a→4a→15b→4c→15d→4e→15f→4g→15h→4i→15j→24j→13i→24h→13g→24f→13e→24d→13c→24b→13a→27a→38b→27c→38d→27e→38f→27g→38h→27i→26i.

[0025] Further, define U4+ as the initial inflow point of the fourth branch current on the U phase, U4- as the final outflow point of the third branch current on the U phase, and the linking route of the fourth branch of the U phase winding from U4+ to U4- as:

[0026] 38j→48j→37i→48h→37g→48f→37e→48d→37c→48b→37a→52a→63b→52c→63d→52e→63f→52g→63h→52i→63j→2j→63i→2h→63g→2f→63e→2d→63c→2b→63a→5a→16b→5c→16d→5e→16f→5g→16h→5i→16j→25j→14i→25h→14g→25f→14e→25d→14c→25b→14a→28a→39b→28c→39d→28e→39f→28g→39h→28i→27i.

[0027] Further, in the first branch and / or the second branch and / or the third branch and / or the fourth branch of the U phase winding, the current flows in from the left end of the first hairpin and out from the right end of the last hairpin.

[0028] Further, in the first hairpin to the last hairpin, starting from the first hairpin, adjacent two points share a hairpin, and the proximal ends of adjacent two hairpins are welded together after stripping and twisting the end.

[0029] In a second aspect, the application further provides an electric machine, comprising: a rotor and a hairpin short-pitch lap-wound armature winding as any one of the first aspect; the rotor is rotatable relative to the hairpin short-pitch lap-wound armature winding.

[0030] Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:

[0031] The hairpin type flat wire short-pitch lap-wound armature winding provided by the application is obtained by adopting U-phase, V-phase and W-phase three-phase parallel flat wires cooperating with hairpin winding of the inner side of the annular stator with n layers of 72 stator slot positions, and a new hairpin type flat wire armature winding mode is provided.

[0032] Compared with the existing hairpin winding, the hairpin type flat wire short-pitch lap-wound armature winding provided by the application optimizes the winding structure and connection mode, reduces the span of the hairpin end and the twisted head end of the winding through the lap winding mode, thereby reducing the end height of the welding end and the hairpin end, and also realizes the balance between the branches of the winding, and the purposes of reducing material cost and improving efficiency.

[0033] Further, the motor provided by the application includes the hairpin type flat wire short-pitch lap-wound armature winding described above, and therefore has all the technical effects of the hairpin type flat wire short-pitch lap-wound armature winding, which will not be described again here. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A slot conductor distribution diagram of the hairpin type flat wire short-pitch lap-wound armature winding provided by the embodiment of the application is provided.

[0035] Figure 2 A three-phase winding schematic diagram of the hairpin type flat wire short-pitch lap-wound armature winding provided by the embodiment of the application is provided.

[0036] Figure 3 A U-phase winding schematic diagram of the hairpin type flat wire short-pitch lap-wound armature winding provided by the embodiment of the application is provided.

[0037] Figure 4 A hairpin end winding schematic diagram of the first branch of the U-phase of the hairpin type flat wire short-pitch lap-wound armature winding provided by the embodiment of the application is provided.

[0038] Figure 5 A welding end winding schematic diagram of the first branch of the U-phase of the hairpin type flat wire short-pitch lap-wound armature winding provided by the embodiment of the application is provided. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the application, the application will be described more fully below with reference to the related drawings. The embodiments of the application are shown in the drawings. However, the application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the application more thorough and comprehensive.

[0040] The application will be further described in detail below with reference to the accompanying drawings and examples, which are used to illustrate the application but not to limit the scope of the application.

[0041] In a first aspect, the application provides a hairpin type short-pitch flat wire short-pitch stacked armature winding, comprising: a U-phase, a V-phase and a W-phase three-phase parallel flat wire cooperating with a hairpin to obtain a ring-shaped stator with n layers of 72 stator slots;

[0042] The U-phase winding comprises four parallel branches, a first branch, a second branch, a third branch and a fourth branch, which are respectively wound along the n-1 direction in a circumferential spiral reciprocating manner from the first starting point, the second starting point, the third starting point and the fourth starting point on the nth layer to the first layer, and then are wound along the n+1 direction in a circumferential spiral reciprocating manner from the first layer to the nth layer, and are wound along the n-1 direction in a circumferential spiral reciprocating manner from the nth layer to the first layer to form a ring-shaped loop at the first ending point, the second ending point, the third ending point and the fourth ending point on the n-1 layer; wherein n is an even number of layers, the nth layer is the outermost layer, and the first layer is the innermost layer;

[0043] The connection modes of the hairpins in the first branch, the second branch, the third branch and the fourth branch are the same, and each two points in each branch are taken as a pair;

[0044] The hairpin on the nth layer has a span of 9 slots, 10 slots or 11 slots, the hairpin on the first layer has a span of 14 slots, and the hairpins on the remaining layers each have a span of 11 slots;

[0045] The V-phase winding is obtained by rotating the U-phase winding by 8 slot positions in the increasing direction of the slot positions;

[0046] The W-phase winding is obtained by rotating the U-phase winding by 16 slot positions in the increasing direction of the slot positions.

[0047] As shown in FIG. 1, Figure 1 The winding provided by the application has 10 layers of slots.

[0048] As shown in FIG. 1, Figures 2 to 5 The winding provided by the application has 10 layers of slots. Taking the flat wire with three-phase parallel two branches and 10 layers of 72 slots as an example, the pole number is 6, and xy is defined as the yth layer of the xth slot, wherein x∈[1, 72], y∈[a, j], a~j is the 1-10 layer number of the slot conductor, a is a layer located in the slot, and f is a layer located outside the slot. For example: 1a refers to the a layer of the 1st stator slot.

[0049] The table 1-60 is only marked the order of current flowing into the slot, in which the number 1 is the position of the current flowing into, namely U+, and the number 60 is the position of the current flowing out, namely U-. That is, U1+ is the initial flowing-in point of the first branch current of U phase, and U1- is the final flowing-out point of the first branch current of U phase.

[0050] In which, AA is the first branch of U phase, AB is the second branch of U phase, AC is the third branch of U phase, AD is the fourth branch of U phase, AA1 is the leading end of the first branch of U phase line, and AA60 is the leading end of neutral line. In addition, the leading end of the line and the neutral end can be exchanged, that is, AA1 can be the leading end of the neutral line, and AA60 can be the leading end of the U phase line.

[0051] It should be noted that BA / BB / BC / BD represents the four branches of V phase, and CA / CB / CC / CD represents the four branches of W phase.

[0052] Figure 2 The figure is a schematic diagram of three-phase winding of 10-layer hairpin type flat wire short-pitch lap winding armature winding, in which the green system is the stator slot occupation of U phase winding, the yellow and pink system is the stator slot occupation of V phase winding, and the blue system is the stator slot occupation of W phase winding.

[0053] Specifically, Figure 3 The figure is a schematic diagram of stator slot occupation of U phase winding of 10-layer hairpin type flat wire short-pitch lap winding armature winding, Figure 4 And Figure 5 The figure is the first branch of U phase winding, taking 39j as the initial flowing-in point of current, from 39j in the 10th layer, the current is spirally wound into the slot to the 9th layer, then from the 8th layer, the current is spirally wound into the slot to the 7th layer, then from the 6th layer, the current is spirally wound into the slot to the 5th layer, then from the 4th layer, the current is spirally wound into the slot to the 3rd layer, then from the 2nd layer, the current is spirally wound into the slot to the 1st layer; then from the 1st layer, the current is spirally wound out of the slot to the 2nd layer in reverse order, then from the 3rd layer, the current is spirally wound out of the slot to the 4th layer, then from the 5th layer, the current is spirally wound out of the slot to the 6th layer, then from the 7th layer, the current is spirally wound out of the slot to the 8th layer, then from the 9th layer, the current is spirally wound out of the slot to the 10th layer, and then from the 10th layer to the 1st layer, the current is spirally wound to 28i in the 9th layer, taking 28i as the final flowing-out point of current.

[0054] In the first branch of U phase winding, the current flows into from the left end of the first hairpin and flows out from the right end of the last hairpin. In the first hairpin to the last hairpin, from the first hairpin, two adjacent points share a hairpin, and the adjacent ends of two adjacent hairpins are welded together after stripping and twisting the end.

[0055] The winding of the first branch in the U phase is described as follows in the specific embodiment:

[0056] The winding connection route of the first branch U+ to U- in the U phase is shown in Figure 3 (U phase winding conductor in the slot schematic diagram) and the U1+ is defined as the initial inflow point of the first branch current in the U phase and the U1- is defined as the final outflow point of the first branch current in the U phase. The flat wire matching hairpin connection route of U1+ to U1- in the first branch of the U phase winding is:

[0057] 39j→49j→38i→49h→38g→49f→38e→49d→38c→49b→38a→52a→63b→52c→63d→52e→63f→52g→63h→52i→63j→2j→63i→2h→63g→2f→63e→2d→63c→2b→63a→5a→16b→5c→16d→5e→16f→5g→16h→5i→16j→25j→14i→25h→14g→25f→14e→25d→14c→25b→14a→28a→39b→28c→39d→28e→39f→28g→39h→28i; inflow from 39j and outflow finally from 28i.

[0058] The welding end winding diagram of the first branch U1+ to U1- in the U phase is shown in Figure 4 (welding end schematic diagram).

[0059] Specifically, from the welding end winding diagram, the current inflows from the right end of the first hairpin, i.e. 39j, the left end of the first hairpin (AA1 and AA2 are a hairpin, and the AA2 end is twisted to the right at the stripping end of the i layer of the 49th slot), and the left end of the second hairpin (AA3 and AA4 are a hairpin, i.e. the AA3 end is twisted to the left at the stripping end of the i layer of the 38th slot), are welded together after being twisted at the stripping end (i.e. AA2 and AA3 are connected by welding), the left end of the second hairpin (AA4 is twisted to the right at the stripping end of the h layer of the 49th slot) and the right end of the third hairpin (AA5 and AA6 are a hairpin, i.e. the AA5 end is twisted to the left at the stripping end of the g layer of the 38th slot) are also welded together after being twisted at the stripping end (i.e. AA4 and AA5 are connected by welding), and so on, and finally outflow from 28i.

[0060] It should be noted that the initial inflow point and the final outflow point can be interchanged. Taking the above first branch of the U phase as an example, the current can inflow from 28i and outflow finally from 39j.

[0061] The branch is a loop after the current initial inflow point and the final outflow point are connected by welding. Any two points of the welding end in the entire loop can be disconnected as the initial inflow point and the final outflow point.

[0062] Taking the first branch of the U-phase winding as an example: 39j and 28i are connected by welding, and the welding points of 63b and 52a are directly disconnected, with 63b as the initial inflow point and 52a as the final outflow point, and the connection line of the entire branch is as follows:

[0063] 63b→52c→63d→52e→63f→52g→63h→52i→63j→2j→63i→2h→63g→2f→63e→2d→63c→2b→63a→5a→16b→5c→16d→5e→16f→5g→16h→5i→16j→25j→14i→25h→14g→25f→14e→25d→14c→25b→14a→28a→39b→28c→39d→28e→39f→28g→39h→28i→39j→49j→38i→49h→38g→49f→38e→49d→38c→49b→38a→52a; from 63b inflow, finally from 52a outflow.

[0064] By analogy, the second branch of the U-phase winding takes 40j as the initial inflow point of the current and 29i as the final outflow point of the current; the third branch of the U-phase winding takes 37j as the initial inflow point of the current and 26i as the final outflow point of the current; and the fourth branch of the U-phase winding takes 38j as the initial inflow point of the current and 27i as the final outflow point of the current.

[0065] Specifically, U2+ is defined as the initial inflow point of the current of the second branch of the U-phase winding, U2- is defined as the final outflow point of the current of the second branch of the U-phase winding, and the connection line of the second branch of the U-phase winding from U2+ to U2- is as follows:

[0066] 40j→50j→39i→50h→39g→50f→39e→50d→39c→50b→39a→53a→64b→53c→64d→53e→64f→53g→64h→53i→64j→3j→64i→3h→64g→3f→64e→3d→64c→3b→64a→6a→17b→6c→17d→6e→17f→6g→17h→6i→17j→26j→15i→26h→15g→26f→15e→26d→15c→26b→15a→29a→40b→29c→40d→29e→40f→29g→40h→29i.

[0067] U3+ is defined as the initial inflow point of the current of the third branch of the U-phase winding, U3- is defined as the final outflow point of the current of the third branch of the U-phase winding, and the connection line of the third branch of the U-phase winding from U3+ to U3- is as follows:

[0068] 37j→47j→36i→47h→36g→47f→36e→47d→36c→47b→36a→51a→62b→51c→62d→51e→62f→51g→62h→51i→62j→1j→62i→1h→62g→1f→62e→1d→62c→1b→62a→4a→15b→4c→15d→4e→15f→4g→15h→4i→15j→24j→13i→24h→13g→24f→13e→24d→13c→24b→13a→27a→38b→27c→38d→27e→38f→27g→38h→27i→26i.

[0069] Definition U4+ is the initial inflow point of the fourth branch current on the U phase, U4- is the final outflow point of the third branch current on the U phase, and the linking route of the fourth branch of the U phase winding from U4+ to U4- is:

[0070] 38j→48j→37i→48h→37g→48f→37e→48d→37c→48b→37a→52a→63b→52c→63d→52e→63f→52g→63h→52i→63j→2j→63i→2h→63g→2f→63e→2d→63c→2b→63a→5a→16b→5c→16d→5e→16f→5g→16h→5i→16j→25j→14i→25h→14g→25f→14e→25d→14c→25b→14a→28a→39b→28c→39d→28e→39f→28g→39h→28i→27i.

[0071] The winding method of the W phase winding is that the U phase winding is rotated by 16 slot positions in the direction of increasing slot number, that is, the first branch flows into the j layer of the 55th slot and finally flows out of the i layer of the 44th slot, and the second branch flows into the j layer of the 56th slot and finally flows out of the i layer of the 45th slot, and the detailed connection route is not described again.

[0072] The winding method of the W phase winding is that the U phase winding is rotated by 16 slot positions in the direction of increasing slot number, that is, the first branch flows into the j layer of the 55th slot and finally flows out of the i layer of the 44th slot, and the second branch flows into the j layer of the 56th slot and finally flows out of the i layer of the 45th slot, and the detailed connection route is not described again.

[0073] The embodiment adopted by the present application is a 10-layer flat wire armature winding, but in the specific implementation process, the number of layers of the cross-layer wire can be deleted or increased to realize the winding of 4, 6, 8, 12 and other even-layer flat wire armature windings, so the winding method adopted by the present application and the hairpin coil matched with the winding method are not limited to the winding of the 10-layer flat wire armature winding.

[0074] The motor of the example adopted by the present application is a hairpin type flat wire winding motor with 6 poles and 72 stator slots, but in the specific implementation process, different windings can be customized due to the difference in the number of slots and branch circuits, and therefore the winding method adopted by the present application and the coil adapted to the winding method are not limited to the winding of the flat wire armature winding of the example.

[0075] The winding design has a significant advantage in improving the slot fill rate of the motor, which can more facilitate the improvement of motor efficiency and the reduction of material cost, and the winding structure is simple, has good process manufacturability, and is suitable for batch production, thereby providing a theoretical basis for motor stator products.

[0076] In addition, the winding structure design adheres to the principle of simplicity without being simple, and its structure is intuitive and easy to understand, which not only facilitates installation and maintenance, but also greatly improves the process manufacturability. This design idea is very suitable for the needs of modern production lines and provides a solid guarantee for batch production and high efficiency. Therefore, the winding technology not only lays a solid theoretical foundation for the design and manufacture of motor stator products, but also opens up a new path for the innovation and progress of motor technology and the overall improvement of motor performance.

[0077] In a second aspect, the embodiment of the present application also provides a motor, comprising: a rotor and a hairpin type flat wire short-pitch lap winding armature winding as described in any of the above first aspects; the rotor can rotate relative to the hairpin type flat wire short-pitch lap winding armature winding.

[0078] Since the motor adopts the hairpin type flat wire short-pitch lap winding armature winding described in the above embodiments, the specific structure of the hairpin type flat wire short-pitch lap winding armature winding is referred to the above embodiments, and since the motor adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0079] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hairpin type short pitch lap wound armature winding characterized by, include: It is obtained by using three-phase parallel flat wires of U phase, V phase and W phase in combination with hairpins to wrap around an annular stator with n layers and 72 stator slots on the inner side; The U-phase winding includes four parallel branches. The first, second, third, and fourth branches are formed by flat wires starting from the first, second, third, and fourth starting points of the nth layer, respectively, and spiraling back and forth in a circular spiral along the direction of n-1, reaching the 1st layer. Then, from the 1st layer, they spiral back and forth in a circular spiral along the direction of n+1, reaching the nth layer. After spiraling back and forth between the nth and 1st layers, they reach the first, second, third, and fourth ending points of the (n-1)th layer, forming a loop. Here, n is an even number of layers, the nth layer is the outermost layer, and the 1st layer is the innermost layer. The hairpins in the first branch, the second branch, the third branch, and the fourth branch are connected in the same way, and every two points in each branch are considered as a pair. Among them, the span of the nth layer of hairpins is 9 slots, 10 slots or 11 slots, the span of the 1st layer of hairpins is 14 slots, and the span of the remaining layers of hairpins is 11 slots. The V-phase winding is obtained by rotating the U-phase winding by 8 slots relative to it in the direction of increasing slot size; The W-phase winding is obtained by rotating the U-phase winding 16 slots relative to it in the direction of increasing slot size; When using a three-phase parallel two-branch flat wire with hairpins to wind through 10 layers and 72 slots, the number of poles is 6 and the number of branches is 4; define xy as the yth layer of the xth slot, where x∈[1,72], y∈[a,j], a is the 1st layer, located inside the slot, and j is the 10th layer, located outside the slot; The first branch of the U-phase winding, with point 39j as the initial current inflow point, starts from point 39j located in the 10th layer and spirals back and forth in a circular motion into the slot to the 9th layer, then spirals back and forth in a circular motion into the slot from the 8th layer to the 7th layer, then spirals back and forth in a circular motion from the 6th layer to the 5th layer, then spirals back and forth in a circular motion from the 4th layer to the 3rd layer, then spirals back and forth in a circular motion from the 2nd layer to the 1st layer; then spirals back and forth in a circular motion from the 1st layer... The current flows in reverse order, spiraling outwards from the trough to the 2nd layer, then spiraling outwards from the 3rd layer to the 4th layer, then spiraling outwards from the 5th layer to the 6th layer, then spiraling outwards from the 7th layer to the 8th layer, then spiraling outwards from the 9th layer to the 10th layer. After spiraling outwards from the 10th layer to the 1st layer, the current flows to 28i located on the 9th layer, with 28i as the final outlet point of the current. Define U1+ as the initial inflow point of the first branch current in phase U, and U1- as the final outflow point of the first branch current in phase U. The connection route of the first branch of the phase U winding from U1+ to U1- is as follows: 39j→49j→38i→49h→38g→49f→38e→49d→38c→49b→38a→52a→63b→52c→63d→52e→63f→52g→63h→52i→63j→2j→63i→2h→63g→2f→63e→2d→63c→2b→63a→5a→16b→5c→16d→5e→16f→5g→16h→5i→16j→25j→14i→25h→14g→25f→14e→25d→14c→25b→14a→28a→39b→28c→39d→28e→39f→28g→39h→28i; the second branch of the U-phase winding, taking the 40j site as the initial inflow point of the current and the 29i site as the final outflow point of the current; the third branch of the U-phase winding, taking the 37j site as the initial inflow point of the current and the 26i site as the final outflow point of the current; the fourth branch of the U-phase winding, taking the 38j site as the initial inflow point of the current and the 27i site as the final outflow point of the current.

2. The hairpin type short-pitch nested armature winding of claim 1, wherein U2+ is defined as the initial inflow point of the second branch current on the U-phase, U2- is defined as the final outflow point of the second branch current on the U-phase, and the linking route of the second branch of the U-phase winding from U2+ to U2- is: 39j→49j→38i→49h→38g→49f→38e→49d→38c→49b→38a→52a→63b→52c→63d→52e→63f→52g→63h→52i→63j→2j→63i→2h→63g→2f→63e→2d→63c→2b→63a→5a→16b→5c→16d→5e→16f→5g→16h→5i→16j→25j→14i→25h→14g→25f→14e→25d→14c→25b→14a→28a→39b→28c→39d→28e→39f→28g→39h→28i; 3. The hairpin type short-pitch nested armature winding of claim 1, wherein, U3+ is defined as the initial inflow point of the third branch current on the U-phase, U3- is defined as the final outflow point of the third branch current on the U-phase, and the linking route of the third branch of the U-phase winding from U3+ to U3- is: 39j→49j→38i→49h→38g→49f→38e→49d→38c→49b→38a→52a→63b→52c→63d→52e→63f→52g→63h→52i→63j→2j→63i→2h→63g→2f→63e→2d→63c→2b→63a→5a→16b→5c→16d→5e→16f→5g→16h→5i→16j→25j→14i→25h→14g→25f→14e→25d→14c→25b→14a→28a→39b→28c→39d→28e→39f→28g→39h→28i; U3+ is defined as the initial inflow point of the third branch current on the U-phase, U3- is defined as the final outflow point of the third branch current on the U-phase, and the linking route of the third branch of the U-phase winding from U3+ to U3- is: 39j→49j→38i→49h→38g→49f→38e→49d→38c→49b→38a→52a→63b→52c→63d→52e→63f→52g→63h→52i→63j→2j→63i→2h→63g→2f→63e→2d→63c→2b→63a→5a→16b→5c→16d→5e→16f→5g→16h→5i→16j→25j→14i→25h→14g→25f→14e→25d→14c→25b→14a→28a→39b→28c→39d→28e→39f→28g→39h→28i; 4. The hairpin type short-pitch nested armature winding of claim 1, wherein, U4+ is defined as the initial inflow point of the fourth branch current on the U phase, U4- is defined as the final outflow point of the third branch current on the U phase, and the linking route of the fourth branch of the U phase winding from U4+ to U4- is: 38j→ 48j→ 37i→ 48h→ 37g→ 48f→ 37e→ 48d→ 37c→ 48b→ 37a→ 52a→ 63b→ 52c→ 63d→ 52e→ 63f→ 52g→ 63h→ 52i→ 63j→ 2j→ 63i→ 2h→ 63g→ 2f→ 63e→ 2d→ 63c→ 2b→ 63a→ 5a→ 16b→ 5c→ 16d→ 5e→ 16f→ 5g→ 16h→ 5i→ 16j→ 25j→ 14i→ 25h→ 14g→ 25f→ 14e→ 25d→ 14c→ 25b→ 14a→ 28a→ 39b→ 28c→ 39d→ 28e→ 39f→ 28g→ 39h→ 28i→ 27i.

5. The hairpin type short-pitch nested armature winding of claim 1, wherein, In the first branch and / or the second branch and / or the third branch and / or the fourth branch of the U phase winding, the current flows in from the left end of the first hairpin and out from the right end of the last hairpin.

6. The hairpin type short-pitch nested armature winding of claim 5, wherein, In the first hairpin to the last hairpin, from the first hairpin, the adjacent two points share a hairpin, and the adjacent two hairpins are twisted by stripping the end and then welded together.

7. An electric machine characterized by Comprise: A rotor and the hairpin-shaped short-pitch lap winding armature winding according to any one of claims 1 to 6; the rotor can rotate relative to the hairpin-shaped short-pitch lap winding armature winding.

Images