Stator assembly and electric machine

Abstract

This application provides a stator assembly and a motor. The stator assembly includes a stator core with multiple stator slots. Each stator slot has 2N layers of receiving layers, which are sequentially divided into N cross-layer groups. The stator windings include coil groups for each phase, and each coil group includes multiple conductor sides that are wound sequentially from the first cross-layer group to the Nth cross-layer group or sequentially from the Nth cross-layer group to the first cross-layer group. The multiple conductor sides of each coil group are alternately received in two adjacent receiving layers of different stator slots within each cross-layer group, and are sequentially wound three times around the circumference of the stator core. The spans of the conductor sides located at single turns in each cross-layer group are 8 and 10, respectively, and alternately switch along the circumference of the stator core. The spans of the two conductor sides connecting two adjacent turns in each cross-layer group are 9 and 12, respectively. The span between the two conductor sides connecting adjacent cross-layer groups is 9. The uniform span distribution between the coils reduces circulating currents between the coils.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a stator assembly, and also to a motor. Background Technology

[0002] The stator assembly of an electric motor includes a stator core and stator windings. The stator windings include multi-phase windings. Each phase winding includes multiple coils connected in series and spaced apart in the stator core. However, in related technologies, the spacing between the coils is uneven, which makes it easier for circulating currents to form between the coils, affecting the working performance of the motor stator. Utility Model Content

[0003] The purpose of this application is to provide a stator assembly and a motor to reduce circulating currents between coils, thereby improving the operating performance of the motor stator.

[0004] To achieve the above objectives, this application provides a stator assembly, comprising:

[0005] A stator core having a plurality of stator slots distributed along its circumference, wherein each stator slot forms 2N layers of receiving layers distributed radially along the stator core; the 2N layers of receiving layers are divided into N layers, with each pair of adjacent receiving layers forming a cross-layer group, and N≥2.

[0006] The stator winding includes a multiphase winding wound in the stator slot, each phase of the winding includes at least one coil group, each coil group includes multiple conductor sides, and the multiple conductor sides of each coil group are wound sequentially from the first cross-layer group to the Nth cross-layer group or sequentially from the Nth cross-layer group to the first cross-layer group.

[0007] In each of the coil groups, multiple conductor sides are alternately accommodated in two adjacent accommodating layers of different stator slots in each of the cross-layer groups, and are sequentially encircled three times along the circumference of the stator core;

[0008] The spans of the conductor sides located in the single-turn portion of each of the aforementioned cross-layer groups are 8 and 10, respectively, and they alternate along the circumference of the stator core.

[0009] The spans of the two conductor sides connecting two adjacent loops in each of the cross-layer groups are 9 and 12, respectively; the span of the two conductor sides connecting two adjacent cross-layer groups is 9.

[0010] Preferably, in the stator assembly described above, each coil group includes multiple hairpin coils connected in series, and each hairpin coil includes two conductor sides, which are respectively located in two adjacent receiving layers of different stator slots;

[0011] The plurality of hairpin coils include three types of hairpin coils with spans of 10, 9 and 12 respectively. The hairpin coils located in the single loop position in each of the span groups have a span of 10. The hairpin coils spanning two adjacent loops in each of the span groups have spans of 9 and 12 respectively. The hairpin coils spanning two adjacent span groups have a span of 9.

[0012] The span of the welded ends formed by connecting two adjacent hairpin coils is 8.

[0013] Preferably, in the stator assembly described above, each coil group further includes two I-type coils located at both ends of the plurality of hairpin coils, forming an input coil and an output coil respectively; each I-type coil includes one conductor side;

[0014] The span between the welding ends of the input coil and the output coil and the adjacent hairpin coil is 8.

[0015] Preferably, in the above stator assembly, the stator core includes 54 stator slots, and the stator winding includes a three-phase winding;

[0016] The spans of the multiple hairpin coils wound in each of the said cross-layer groups are 10, 10, 9, 10, 10, 12, 10, 10, and 9, respectively.

[0017] Preferably, in the above stator assembly, each coil group has an input terminal and an output terminal at both ends; the input terminal and the output terminal are separated by 8 stator slots.

[0018] Preferably, in the above stator assembly, the stator winding includes a three-phase winding, the incoming terminals of the three-phase winding are distributed sequentially at intervals of 5 stator slots, and the outgoing terminals of the three-phase winding are distributed sequentially at intervals of 5 stator slots.

[0019] Preferably, in the stator assembly described above, each phase winding includes at least two branches, and each branch is formed by one of the coil groups.

[0020] Preferably, in the stator assembly described above, each phase winding includes two parallel branches, which are formed by a first coil group and a second coil group, respectively. The plurality of conductor sides of the first coil group are wound sequentially from the first cross-layer group to the Nth cross-layer group, and the plurality of conductor sides of the second coil group are wound sequentially from the Nth cross-layer group to the first cross-layer group.

[0021] Preferably, in the stator assembly described above, the first coil group is provided with a first input terminal and a first output terminal, which are located in the receiving layers of the first layer and the second layer, respectively, and extend out from the crown end of the stator winding;

[0022] The second coil group is provided with a second inlet terminal and a second outlet terminal, which are located in the receiving layer of the 2Nth layer and the 1st layer respectively and are extended out from the crown end of the stator winding;

[0023] The first incoming terminal and the second incoming terminal are located at the same radial position of the stator core, and the first outgoing terminal and the second outgoing terminal are located at the same radial position of the stator core.

[0024] On the other hand, this application provides an electric motor including the stator assembly described in any of the above claims.

[0025] In the stator assembly provided in this application, the 2N layers of receiving layers formed in each stator slot of the stator core are divided into N spanning groups, with each pair of adjacent receiving layers forming a spanning group from the 1st layer to the 2Nth layer. Multiple conductor sides of each coil group of the stator winding are alternately received in adjacent receiving layers of different stator slots within each spanning group, and sequentially encircle the stator core three times circumferentially. The spans of the conductor sides located at single-turn positions in each spanning group are 8 and 10, respectively, and alternately switch circumferentially along the stator core. The spans of the two conductor sides connecting two adjacent turns in the cross-layer group are 9 and 12 respectively; the span of the two conductor sides connecting two adjacent cross-layer groups is 9. With this setting, the spans between the three turns of conductor sides in each cross-layer group and the conductor sides crossing the next cross-layer group are 9 and 12 respectively. This allows the conductor sides with spans of 9 and 12 to be distributed between the conductor sides with spans of 8 and 10, making the span distribution between the coils more uniform. This can reduce the circulating current formed between the coils and thus improve the working performance of the motor stator.

[0026] For example, for a stator core with 54 stator slots, the span of the conductor side in each span group can be 8, 10, 8, 10, 8, 9, 8, 10, 8, 10, 8, 12, 8, 10, 8, 10, 8, 9 in sequence, or the positions of spans 9 and 12 can be adjusted to 8, 10, 8, 10, 8, 12, 8, 10, 8, 10, 8, 9, 8, 10, 8, 10, 8, 9. The span distribution between coils is relatively uniform, which can effectively reduce the circulating current formed between coils. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be introduced below. The accompanying drawings described below are merely embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 The present application shows a schematic diagram of the structure of a stator assembly provided in some embodiments;

[0029] Figure 2 This application provides schematic diagrams illustrating the structures of three types of hairpin coils with stator windings arranged in a multi-layer group, according to some embodiments of the present application.

[0030] Figure 3 This illustration shows a schematic diagram of the structure of a hairpin coil with a stator winding spanning between adjacent cross-layer groups, according to some embodiments of this application.

[0031] Figure 4 This application shows a schematic diagram of the structure of a type I coil of a stator winding provided in some embodiments;

[0032] Figure 5 This application shows a schematic diagram of the structure of the welded end of a stator winding provided in some embodiments;

[0033] Figure 6 This invention provides a schematic diagram of the winding principle of one coil group of a stator winding according to some embodiments of the present application.

[0034] Figure 7 This application shows a schematic diagram of the U-phase first branch winding path of a stator winding provided in some embodiments;

[0035] Figure 8 A schematic diagram of the U-phase second branch winding path of the stator winding provided in some embodiments of this application is shown.

[0036] in, Figures 1-5 middle:

[0037] 1-Stator winding; 2-Stator core;

[0038] 101 - Second U-phase incoming terminal; 102 - First U-phase incoming terminal; 103 - Second V-phase incoming terminal; 104 - First V-phase incoming terminal; 105 - First U-phase outgoing terminal; 106 - Second U-phase outgoing terminal; 107 - Second W-phase incoming terminal; 108 - First W-phase incoming terminal; 109 - First V-phase outgoing terminal; 110 - Second V-phase outgoing terminal; 111 - Second W-phase outgoing terminal; 112 - First W-phase outgoing terminal;

[0039] 11- First type of hairpin coil; 12- Second type of hairpin coil; 13- Third type of hairpin coil; 14- Type I coil; 15- Conductor edge. Detailed Implementation

[0040] The embodiments of this application will be described below. It should be noted that, in order to provide a concise description of these embodiments, this specification cannot provide a detailed description of all features of the actual embodiments. It should be understood that, in the actual implementation of any embodiment, changes may occur from one embodiment to another to achieve specific objectives. Furthermore, it is also understood that, although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content of this application, some design, manufacturing, or production modifications based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient content of this application.

[0041] like Figure 1 As shown, the stator assembly provided in this application embodiment includes a stator core 2, which has a plurality of stator slots distributed along its circumference. Each stator slot forms 2N layers of receiving layers distributed radially along the stator core 2. The 2N layers of receiving layers are divided into N layers, from the first layer to the 2Nth layer, with each two adjacent receiving layers forming a cross-layer group, and N≥2. The stator winding 1 includes a multi-phase winding wound in the stator slots. Each phase winding includes at least one coil group, and each coil group includes a plurality of conductor sides 15. The plurality of conductor sides 15 of each coil group are wound sequentially from the first cross-layer group to the Nth cross-layer group or sequentially from the Nth cross-layer group to the first cross-layer group.

[0042] In each coil group, multiple conductor edges 15 are alternately housed in two adjacent receiving layers of different stator slots in each cross-layer group, and are sequentially encircled three times along the circumference of the stator core 2; the spans of the conductor edges 15 located in the single-turn section in each cross-layer group are 8 and 10, respectively, and are alternately switched along the circumference of the stator core 2; the spans of the two conductor edges 15 connecting two adjacent turns in each cross-layer group are 9 and 12, respectively; the span of the two conductor edges 15 connecting two adjacent cross-layer groups is 9.

[0043] In the stator assembly provided in this application, the 2N layers of receiving layers formed in each stator slot of the stator core 2 are divided into N spanning groups, with each pair of adjacent receiving layers forming a spanning group from the 1st layer to the 2Nth layer. Multiple conductor edges 15 of each coil group of the stator winding 1 are alternately received in adjacent receiving layers of different stator slots in each spanning group, and sequentially encircle the stator core 2 three times circumferentially. The spans of the conductor edges 15 located at single-turn positions in each spanning group are 8 and 10, respectively, and alternately switch along the circumferential direction of the stator core 2. Each spanning group... The spans of the two conductor edges 15 connecting two adjacent turns in the group are 9 and 12 respectively; the span of the two conductor edges 15 connecting two adjacent cross-layer groups is 9. With this setting, the spans between the three turns of conductor edges 15 in each cross-layer group and the conductor edges 15 crossing the next cross-layer group are 9 and 12 respectively. This allows the conductor edges 15 with spans of 9 and 12 to be distributed among the conductor edges 15 with spans of 8 and 10, making the span distribution between the coils more uniform. This can reduce the circulating current formed between the coils, thereby improving the working performance of the motor stator.

[0044] Furthermore, the multiple conductor edges 15 of each coil group are alternately accommodated in two adjacent layers of different stator slots in each cross-layer group, and are sequentially wrapped three times around the circumference of the stator core 2. This wave-wound (a single branch with a return loop from the starting section to the output section) allows the lead wires of the multi-phase windings to be closer together, making the busbar layout more compact. Moreover, each coil group is a cross-layer from the 1st layer to the 2Nth layer, which locally lowers the winding ends, facilitating manufacturing.

[0045] The embodiments of this application are applicable to stator slots that are multiples of 9, such as a stator winding 1 with 54 slots, 6 poles, and 2 branches; and also to a stator winding 1 with 72 slots, 8 poles, and 2 branches.

[0046] Each stator slot forms 2N accommodating layers, where N ≥ 2. N can be 2, resulting in 4 accommodating layers; N can be 3, resulting in 6 accommodating layers; N can be 4, resulting in 8 accommodating layers. N can also be any other integer greater than 2, forming other even-numbered accommodating layers; thus creating an integer number of cross-layer groups within the stator slot. For example, ... Figure 5 Eight receiving layers are formed in each stator slot of the stator winding 1 shown.

[0047] For the stator core 2 with 54 stator slots, the span of the conductor side 15 in each span group can be 8, 10, 8, 10, 8, 9, 8, 10, 8, 10, 8, 12, 8, 10, 8, 10, 8, 9 in sequence, or the positions of spans 9 and 12 can be adjusted to 8, 10, 8, 10, 8, 12, 8, 10, 8, 10, 8, 9, 8, 10, 8, 10, 8, 9. The span distribution between coils is relatively uniform, which can effectively reduce the circulating current formed between coils.

[0048] Optionally, the stator winding 1 in this embodiment can be a distributed winding, in which the coil is wound on the teeth of multiple stator cores 2 with a certain number of turns. The stator winding 1 can be a round wire winding or a flat wire winding, preferably a flat wire winding, which enables the motor to have higher power output in the same volume, and also provides more efficient performance. It has advantages such as high copper fill factor, good heat dissipation of motor windings, improved voltage withstand capability of windings, and reduced winding end length, thereby improving the torque density and power density of the motor.

[0049] In some embodiments, each coil group includes multiple hairpin coils connected in series, each hairpin coil including two conductor sides 15 located in two adjacent receiving layers of different stator slots; the multiple hairpin coils include three types of hairpin coils with spans of 10, 9 and 12 respectively, the hairpin coils located in the single-turn portion of each cross-layer group have a span of 10, the hairpin coils spanning two adjacent turns in each cross-layer group have spans of 9 and 12 respectively, and the hairpin coils spanning two adjacent cross-layer groups have a span of 9.

[0050] like Figure 2 As shown, each coil group includes three types of hairpin coils in a cross-layer group (e.g., the first layer crosses the second layer). The first type of hairpin coil 11 has a span of 12, and its two conductor edges 15 span 12 slots, for example, from slot 1 to slot 13. The second type of hairpin coil 12 has a span of 9, and its two conductor edges 15 span 9 slots, for example, from slot 1 to slot 10. The third type of hairpin coil 13 has a span of 10, and its two conductor edges 15 span 9 slots, for example, from slot 1 to slot 11. For the case where 8 layers are formed in each stator slot, the spans of subsequent cross-layer groups (the third layer crosses the fourth layer, the fifth layer crosses the sixth layer, and the seventh layer crosses the eighth layer) are all these three types.

[0051] like Figure 3 As shown, each coil group has another type of interlayer crossing between two adjacent cross-layer groups, namely the second layer crossing the third layer, the fourth layer crossing the fifth layer, and the sixth layer crossing the seventh layer. The span is 9 through the hairpin coil 12 of the second type of line.

[0052] The stator winding 1 has two ends protruding from the stator core 2. One end is welded to form a welded end, and the other end is a closed connection end of the hairpin coil to form a crown end. The hairpin coils are arranged across layers, which makes the crown end winding locally lower, which facilitates the manufacturing process.

[0053] In this way, each coil group is wound in the stator slot of the stator core 2 by multiple hairpin coils (also known as hairpins or H-type windings, resembling hairpins) connected in series. One end of the hairpin coil is closed and does not require connection, which simplifies the winding process and improves winding efficiency. Moreover, using only three types of hairpin coils can reduce costs.

[0054] In some embodiments, the span of the welded ends formed by connecting two adjacent hairpin coils is 8. When the span = number of stator slots / number of pole pairs, for example 54 / 6, the span is 9, which is a full span. When the span is less than the full span, the span is a short span. In this embodiment, the coil group welded ends are arranged in a short span manner, and the number of slots spanned by the two conductor edges 15 is 8, for example, from slot 1 to slot 9. This can reduce the length of the welded end, shorten the length of the coil end, save copper wire, thereby reducing copper cost, resistance, harmonics, and improving efficiency. It can also make the conductor edges 15 of the welded end more uniformly arranged, which will greatly reduce tooling costs. Moreover, for any subsequent branch number scheme, the welded end does not need to be changed, and the platformization cost will be greatly reduced.

[0055] like Figure 5 As shown, the first and second conductor edges 15 of the welding end are connected to conduct current, with a span of 8; the third and fourth conductor edges 15 of the welding end are connected to conduct current, with a span of 8; the fifth and sixth conductor edges 15 of the welding end are connected to conduct current, with a span of 8; and the seventh and eighth conductor edges 15 of the welding end are connected to conduct current, with a span of 8. All spans at the welding ends are short spans.

[0056] Optionally, a coil group can be configured as follows: Figure 5 The inner layer shown can be used as the first layer, but the outer layer can also be used as the first layer. When the inner layer is the first layer, in the example shown, even-numbered layers can be to the right of odd-numbered layers, or even-numbered layers can be to the left of odd-numbered layers. If the even-numbered layer is to the left of the odd-numbered layer, the arrangement of the crown end and the weld end needs to be adjusted accordingly.

[0057] In some embodiments, each coil group further includes two I-pin coils 14 (also called i-pins) located at both ends of the plurality of hairpin coils, forming an input coil and an output coil, respectively; each I-pin coil 14 includes a conductor edge 15; the span between the input coil and the output coil and the solder end of the adjacent hairpin coil is 8. This combination of hairpin coils and I-pin coils 14 allows the lead wire to exit from the crown end, lowering the solder end of the winding and thus reducing the platform cost and equipment cost of the solder end; for example, as... Figure 4 As shown, the coil group can be configured as type I coil 14 in the 1st and 2Nth layers.

[0058] It is understood that other types of coils, such as X-type coils, can also be used in the embodiments of this application, as long as the above-mentioned winding method of cross-layer and cross-span can be achieved.

[0059] In some embodiments, the stator core 2 includes 54 stator slots, and the stator winding 1 includes a three-phase winding; the spans of the multiple hairpin coils wound in each layer group are 10, 10, 9, 10, 10, 12, 10, 10, and 9, respectively.

[0060] The three-phase windings are U-phase, V-phase, and W-phase. Taking the U-phase of a 54-slot, 6-pole, 8-layer, 2-branch stator winding 1 as an example, for the sake of simplicity, a, b, c, d, e, f, g, and h represent the 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, and 8th layers respectively, and the numbers 1-54 represent the 54 stator slots distributed circumferentially in the stator core 2.

[0061] U-phase branch 1 winding path: Enter the wire at the crown end, and wind it sequentially at 3a-11b-21a-29b-39a-47b-2a-10b-20a-28b-38a-46b-4a-12b-22a-30b-40a-48b-3c-11d-21c-29d-39c-47d-2c-10d-20c-28d-38c-46d-4c-12d-22c-30d-4 0c-48d-3e-11f-21e-29f-39e-47f-2e-10f-20e-28f-38e-46f-4e-12f-22e-30f-40e-48f-3g-11h-21g-29h-39g-47h-2g-10h-20g-28h-38g-46h-4g-12h-22g-30h-40g-48h, and the line exits from the crown end; such as Figure 6 The diagram shown is the winding schematic of the coil group in the first branch of phase U. Figure 7 The diagram shown is a layout diagram of the stator slots for the coil winding of the first branch. Figure 7The numbers in the horizontal table represent the arrangement order of the 54 stator slots, the vertical table represents the 8 layers of the stator slots, and the red arrows indicate the direction of the coil's entry and exit lines.

[0062] U-phase branch 2 winding path: Enter at the crown end, and wind sequentially at 3h-49g-39h-31g-21h-13g-1h-47g-37h-29g-19h-11g-2h-48g-38h-30g-20h-12g-3f-49e-39f-31e-21f-13e-1f-47e-37f-29e-19f-11e-2f-48e-38f-30e-2 0f-12e-3d-49c-39d-31c-21d-13c-1d-47c-37d-29c-19d-11c-2d-48c-38d-30c-20d-12c-3b-49a-39b-31a-21b-13a-1b-47a-37b-29a-19b-11a-2b-48a-38b-30a-20b-12a, and the line exits from the crown end; such as Figure 8 The diagram shown is a layout diagram of the stator slots for the coil group in the second branch. Figure 8 The numbers in the horizontal table represent the arrangement of the 54 stator slots, the vertical table represents the 8 layers of the stator slots, and the red arrows indicate the direction of the coil's entry and exit.

[0063] In general, the coil groups of each branch of each phase winding adopt two winding methods. The first winding method is as follows: the input end of the coil group enters the stator core 2 from the crown end at slot K of layer a (first branch K, second branch K-1, third branch K-2), then crosses to slot K+m (m=8) of layer b at the welding end and enters the stator core 2. Then, at the crown end, it crosses to slot K+m+n (n=10) of layer a and enters the stator core 2. It continues to cross to slot K+2m+n of layer b at the welding end, then crosses to slot K+2m+2n of layer a at the crown end. When entering slot K+3m+2n of layer b, the crown end crosses to slot K+3m+2n+r (r=9 or 12) of layer a, then crosses to slot K+4m+2n+r of layer b at the welding end, then crosses to slot K+4m+3n+r of layer a at the crown end. And so on. The winding will cycle forward through slots K+xm+yn+zr until the first reverse layer crossing occurs, crossing from layer b to layer c, and then begin cycling the aforementioned span for the second winding segment. Similarly, the coil group cycles between layers c and d, between layers ef and gh, and also follows the above rules.

[0064] The second winding method is as follows: The input end of the other coil group enters the stator core 2 from the crown end at slot K (first branch K, second branch K-1, third branch K-2) in layer h. Then, at the welding end, it crosses over to slot Km (m=8) in layer g and enters the stator core 2. Then, at the crown end, it crosses over to slot Kmn (n=10) in layer h and enters the stator core 2. It continues to cross over to slot K-2m-n in layer g at the welding end, and then crosses over to slot K-2m-2n in layer h at the crown end. When entering the k-3m-2n in layer g, the crown end crosses over to slot K-3m-2n-r (r=9 or 12) in layer h. It continues to cross over to slot K-4m-2n-r in layer g at the welding end, and then crosses over to slot K-4m-3n-r in layer h at the crown end. And so on. The winding will cycle forward through slots K-xm-yn-zr until the first reverse layer crossover occurs, crossing from layer g to layer f, and then begin the cycle of the aforementioned span for the second winding segment. Similarly, the coil group cycles between layers fe, dc, and ba, also following the above rules.

[0065] When x+y is even, the winding enters the core from the crown end (2N+1 layers) to the weld end. When x+y is odd, the winding enters the core from the weld end (2N layers) to the crown end. X is 0, 1, 2, 3…Q, and y is 0, 1, 2, 3…P. Where Q≤Z(number of slots) / 12, P<Z(number of slots) / 12. Z is the number of stator slots, and Z is a multiple of 9; 2N is the number of layers.

[0066] In this embodiment, all stator windings 1 are multi-layered, which reduces the local height of the crown-end winding, facilitating manufacturing. Because the windings are led out from the crown end, the platform cost and equipment cost of the welding end are reduced. It has advantages such as short welding end spacing, no co-layers at the welding end and crown end, low crown end, low welding end, and compact lead wire layout due to the corrugated winding.

[0067] like Figure 1 As shown, in some embodiments, each coil group has an input terminal and an output terminal at both ends; the input terminal and the output terminal are separated by 8 stator slots. With this arrangement, the U-phase input and U-phase output are separated by 8 slots, the V-phase input and V-phase output are separated by 8 slots, and the W-phase input and W-phase output are separated by 8 slots, resulting in a relatively uniform layout and facilitating the input and output of wires.

[0068] In some embodiments, the stator winding 1 includes a three-phase winding, with the incoming terminals of the three-phase winding spaced five stator slots apart and the outgoing terminals of the three-phase winding spaced five stator slots apart. This arrangement, with the U-phase, V-phase, and W-phase incoming terminals each spaced five slots apart, and the U-phase, V-phase, and W-phase outgoing terminals each spaced five slots apart, makes the distance between the three-phase leads very short, facilitating busbar miniaturization and cost savings.

[0069] Phase V can be offset clockwise (or counterclockwise) by 2 + Z / P from Phase U, where Z is the number of slots and P is the number of pole pairs. Phase W can be offset by the same number of slots from Phase V.

[0070] like Figure 1 As shown, each branch is equipped with incoming and outgoing terminals. The U-phase incoming terminals include a first U-phase incoming terminal 102 and a second U-phase incoming terminal 101; the V-phase incoming terminals include a first V-phase incoming terminal 104 and a second V-phase incoming terminal 103; and the W-phase incoming terminals include a first W-phase incoming terminal 108 and a second W-phase incoming terminal 107. The U-phase outgoing terminals include a first U-phase outgoing terminal 105 and a second U-phase outgoing terminal 106; the V-phase outgoing terminals include a first V-phase outgoing terminal 109 and a second V-phase outgoing terminal 110; and the W-phase outgoing terminals include a first W-phase outgoing terminal 112 and a second W-phase outgoing terminal 111. The U, V, and W phases are interchangeable, as are the incoming and outgoing terminals. When a U-phase incoming terminal becomes an outgoing terminal, the corresponding U-phase outgoing terminal must also become an incoming terminal. The example above shows the outer layer as the incoming layer, but in practice, the inner layer can also be used as the incoming layer.

[0071] In some embodiments, each phase winding includes at least two branches, each branch being formed by a coil group. Each phase winding may include two, three, or other numbers of branches, which facilitates coil winding and improves motor efficiency. The number of branches can be optimized according to interface requirements, saving costs while meeting performance requirements.

[0072] In some embodiments, each phase winding includes two parallel branches, which are formed by a first coil group and a second coil group, respectively. The multiple conductor sides 15 of the first coil group are wound sequentially from the first cross-layer group to the Nth cross-layer group, and the multiple conductor sides 15 of the second coil group are wound sequentially from the Nth cross-layer group to the first cross-layer group. The stator winding 1 can be 54 slots, 6 poles, 2 branches, and 8 layers. One branch winds from the first layer of the receiving layer to the 2Nth layer, and two branches wind from the 2Nth layer of the receiving layer to the first layer, which facilitates coil winding and improves motor efficiency. The two branches can also be connected in series.

[0073] In some embodiments, the first coil group is provided with a first input terminal and a first output terminal, which are located sequentially in the receiving layers of the 1st and 2Nth layers and extend out from the crown end of the stator winding 1; the second coil group is provided with a second input terminal and a second output terminal, which are located sequentially in the receiving layers of the 2Nth and 1st layers and extend out from the crown end of the stator winding 1; wherein, the first input terminal and the second input terminal are located at the same radial position of the stator core 2, and the first output terminal and the second output terminal are located at the same radial position of the stator core 2. In this embodiment, the input and output terminals of the two branches both adopt inner and outer layer output, and the input and output lines are located at the same radial position, which can shorten the circumferential span of the lead wire, facilitate the miniaturization of the busbar, and save costs.

[0074] On the other hand, this application embodiment also provides a motor, including the stator assembly provided in any of the above embodiments. In the stator assembly provided in this application embodiment, the 2N layers of receiving layers formed in each stator slot of the stator core 2 are divided into N spanning groups, with each pair of adjacent receiving layers forming a spanning group from the 1st layer to the 2Nth layer; the multiple conductor edges 15 of each coil group of the stator winding 1 are alternately received in two adjacent receiving layers of different stator slots in each spanning group, and are sequentially encircled three times along the circumference of the stator core 2; the span of the conductor edge 15 located at the single-turn position in each spanning group is 8 and 10 respectively, and is alternately switched along the circumference of the stator core 2; each spanning group has multiple conductor edges 15 of different coil groups, which are alternately received in two adjacent receiving layers of different stator slots in each spanning group, and are sequentially encircled three times ..., and are sequentially encircled three times along the circumference of the stator core 2, and are sequentially encircled three times along the circumference of the stator core 2, and are sequentially encircled three times along the circumference of the st The spans of the two conductor edges 15 connecting two adjacent turns in the layer group are 9 and 12 respectively; the span of the two conductor edges 15 connecting two adjacent cross-layer groups is 9. With this setting, the spans between the three turns of conductor edges 15 in each cross-layer group and the conductor edges 15 crossing the next cross-layer group are 9 and 12 respectively. This allows the conductor edges 15 with spans of 9 and 12 to be distributed among the conductor edges 15 with spans of 8 and 10, making the span distribution between the coils more uniform. This can reduce the circulating current formed between the coils, thereby improving the working performance of the motor stator.

[0075] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details of the above application are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0076] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Unless otherwise defined, the technical or scientific terms used in the claims and description should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar words used in the patent application description and claims of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar words mean that the element or object preceding "comprising" or "including" encompasses the element or object listed following "comprising" or "including" and its equivalents, and do not exclude other elements or objects. The terms "connected," "coupled," or "linked" and similar words are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections. Words such as “including,” “contains,” and “has” are open-ended words that mean “including but not limited to” and can be used interchangeably with them.

[0077] In this application, the terms "or" and "and / or" describe the relationship between related objects and indicate a non-exclusive inclusion. For example, "A and / or B" and "A or B" can include: only "A" exists, only "B" exists, and both "A" and "B" exist simultaneously, where "A" and "B" can be singular or plural. As another example, "A, B, and / or C" and "A, B, or C" can include: only "A" exists, only "B" exists, only "C" exists, both "A" and "B" exist simultaneously, both "A" and "C" exist simultaneously, both "B" and "C" exist simultaneously, and both "A", "B", and "C" exist simultaneously, where "A", "B", and "C" can be singular or plural. Furthermore, the symbol " / " in this application indicates an "or" relationship between the related objects before and after the symbol. In this application, the term "at least one A or B" has the same meaning as the aforementioned "A or B". The term "at least one A, B or C" has the same meaning as "A, B or C" above.

[0078] In the apparatus and equipment of this application, the components can be disassembled and / or reassembled. These disassemblies and / or reassemblies should be considered as equivalent solutions of this application.

[0079] The above description of the claimed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be applied within the widest scope consistent with the principles and novel features of this application.

[0080] The above description has been given for illustrative and descriptive purposes. Furthermore, this description is not intended to limit the embodiments of this application to the forms described herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A stator assembly, characterized in that, include: A stator core having a plurality of stator slots distributed along its circumference, wherein each stator slot forms 2N layers of receiving layers distributed radially along the stator core; the 2N layers of receiving layers are divided into N layers, with each pair of adjacent receiving layers forming a cross-layer group, and N≥2. The stator winding includes a multiphase winding wound in the stator slot, each phase of the winding includes at least one coil group, each coil group includes multiple conductor sides, and the multiple conductor sides of each coil group are wound sequentially from the first cross-layer group to the Nth cross-layer group or sequentially from the Nth cross-layer group to the first cross-layer group. In each of the coil groups, multiple conductor sides are alternately accommodated in two adjacent accommodating layers of different stator slots in each of the cross-layer groups, and are sequentially encircled three times along the circumference of the stator core; The spans of the conductor sides located in the single-turn portion of each of the aforementioned cross-layer groups are 8 and 10, respectively, and they alternate along the circumference of the stator core. The spans of the two conductor sides connecting two adjacent loops in each of the cross-layer groups are 9 and 12, respectively; the span of the two conductor sides connecting two adjacent cross-layer groups is 9.

2. The stator assembly according to claim 1, characterized in that, Each of the coil groups includes multiple hairpin coils connected in series, and each hairpin coil includes two conductor sides, which are respectively located in two adjacent receiving layers of different stator slots; The plurality of hairpin coils include three types of hairpin coils with spans of 10, 9 and 12 respectively. The hairpin coils located in the single loop position in each of the span groups have a span of 10. The hairpin coils spanning two adjacent loops in each of the span groups have spans of 9 and 12 respectively. The hairpin coils spanning two adjacent span groups have a span of 9. The span of the welded ends formed by connecting two adjacent hairpin coils is 8.

3. The stator assembly according to claim 2, characterized in that, Each coil group further includes two I-type coils located at both ends of the plurality of hairpin coils, forming an input coil and an output coil respectively; each I-type coil includes one conductor side; The span between the welding ends of the input coil and the output coil and the adjacent hairpin coil is 8.

4. The stator assembly according to claim 2, characterized in that, The stator core includes 54 stator slots, and the stator winding includes a three-phase winding. The spans of the multiple hairpin coils wound in each of the said cross-layer groups are 10, 10, 9, 10, 10, 12, 10, 10, and 9, respectively.

5. The stator assembly according to claim 1, characterized in that, Each coil group has an input terminal and an output terminal at both ends; the input terminal and the output terminal are separated by 8 stator slots.

6. The stator assembly according to claim 5, characterized in that, The stator winding includes a three-phase winding, wherein the input terminals of the three-phase winding are distributed at intervals of 5 stator slots, and the output terminals of the three-phase winding are distributed at intervals of 5 stator slots.

7. The stator assembly according to any one of claims 1-6, characterized in that, Each phase winding includes at least two branches, each branch being formed by one of the coil groups.

8. The stator assembly according to claim 7, characterized in that, Each phase winding includes two parallel branches, which are formed by a first coil group and a second coil group, respectively. The conductor sides of the first coil group are wound sequentially from the first cross-layer group to the Nth cross-layer group, and the conductor sides of the second coil group are wound sequentially from the Nth cross-layer group to the first cross-layer group.

9. The stator assembly according to claim 8, characterized in that, The first coil group is provided with a first inlet terminal and a first outlet terminal, which are located in the receiving layer of the 1st layer and the 2Nth layer respectively and are extended out from the crown end of the stator winding; The second coil group is provided with a second inlet terminal and a second outlet terminal, which are located in the receiving layer of the 2Nth layer and the 1st layer respectively and are extended out from the crown end of the stator winding; The first incoming terminal and the second incoming terminal are located at the same radial position of the stator core, and the first outgoing terminal and the second outgoing terminal are located at the same radial position of the stator core.

10. An electric motor, characterized in that, Includes the stator assembly as described in any one of claims 1-9.

Images