Short-pitch winding, stator assembly and motor

Abstract

The invention relates to the technical field of motor manufacturing, and provides a short-pitch winding, a stator assembly and a motor, the short-pitch winding comprises a three-phase winding, and each branch of each phase winding comprises a plurality of sub-circuits arranged at intervals in the circumferential direction and a plurality of series circuits; each sub-circuit comprises a plurality of primary winding conductors, the two ends of each primary winding conductor in one sub-circuit penetrate through two specified stator slots respectively, and the two ends of each primary winding conductor are arranged across a slot layer; the series circuit comprises a second-class winding conductor, two ends of the second-class winding conductor are connected to two circumferentially adjacent sub-circuits, and the two ends of the second-class winding conductor are arranged in the same groove layer. According to the short-distance winding, the span types of the winding conductors are few, and the span can be set to be large, so that the arrangement mode is simplified, the manufacturing complexity of the winding conductors is reduced, and the material cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of motor manufacturing, and in particular to a short-pitch winding, a stator assembly and a motor. Background Art

[0002] As a core component of new energy vehicles, the electric drive system significantly impacts a vehicle's power, economy, comfort, safety, and lifespan. The motor, as a core component of the electric drive system, directly influences its performance. To improve the performance of electric drive systems, existing motors typically utilize flat wire windings. The stator assembly of a flat wire winding motor consists of a stator core and flat wire windings arranged in multiple stator slots distributed circumferentially along the stator core.

[0003] With the rapid development of new energy drives, miniaturization and high speed are the main development trends of new energy drive motors. High speed requires higher motor heat dissipation performance, while miniaturization requires a significant increase in motor power density.

[0004] Existing flat wire motors usually have too many different spans of winding conductors, resulting in complex arrangements, high mold investment costs, complex manufacturing processes, and high material costs.

[0005] To this end, the present invention provides a short-pitch winding, a stator assembly, and a motor, wherein the span types of the winding conductors are fewer, so as to simplify the arrangement, reduce the manufacturing complexity of the winding conductors, and reduce the material cost. Summary of the Invention

[0006] The object of the present invention is to provide a short-pitch winding, a stator assembly and a motor, wherein the span types of the winding conductors are relatively small, so as to simplify the arrangement, reduce the manufacturing complexity of the winding conductors and reduce the material cost.

[0007] The present invention provides a short-spacing winding, comprising a three-phase winding, wherein each branch of each phase winding comprises a plurality of sub-circuits arranged at intervals along the circumferential direction and a plurality of series circuits;

[0008] The sub-circuit matches two stator slots, the sub-circuit includes a plurality of first-class winding conductors, two ends of each first-class winding conductor in the sub-circuit respectively pass through the two stator slots, and the two ends of the first-class winding conductor are arranged across a slot layer;

[0009] The series circuit includes two types of winding conductors, both ends of which are connected to two circumferentially adjacent sub-circuits, and both ends of the two types of winding conductors are arranged in the same slot layer.

[0010] Optionally, a single-phase winding is arranged in a plurality of circumferentially spaced stator slot groups, each stator slot group comprising four circumferentially adjacent stator slots;

[0011] Each winding is configured such that: the phase winding occupies all layers of the two stator slots in the middle of the corresponding stator slot group and partially occupies all layers of the two stator slots at the edges of the corresponding stator slot group.

[0012] Optionally, in the two stator slots at the edges, the sum of the number of layers occupied by the phase winding is equal to the total number of layers of the stator slots.

[0013] Optionally, the span of the first type of winding conductor is a first span, and the span of the second type of winding conductor is a second span, and the absolute value of the difference between the first span and the second span is less than or equal to 3.

[0014] Optionally, the second span is greater than or equal to 7 slots.

[0015] Optionally, the first span is 8 slots; and / or, the second span includes 7 slots and / or 8 slots and / or 9 slots and / or 10 slots and / or 11 slots.

[0016] Optionally, the proportion of the first type of winding conductor in one branch in all the winding conductors in this branch is greater than 50%; the proportion of the second type of winding conductor in one branch in all the winding conductors in this branch is less than 50%.

[0017] Optionally, the short-pitch winding is based on a topological structure of 54 slots, 6 poles, and n layers, where n is an integer greater than or equal to 2.

[0018] Optionally, n is 6.

[0019] Optionally, the three-phase windings are arranged in spatial central symmetry.

[0020] The present invention also provides a stator assembly including the short-pitch winding described above.

[0021] The present invention also provides a motor including the stator assembly described above.

[0022] In summary, the short-pitch winding includes three-phase windings. Each branch of each phase winding includes a plurality of sub-lines and a plurality of series lines arranged at intervals in the circumferential direction; the sub-lines include a plurality of first-type winding conductors. The two ends of each first-type winding conductor in one sub-line respectively pass through two specified stator slots, and the two ends of the first-type winding conductor are arranged across one slot layer; the series lines include second-type winding conductors, and the two ends of the second-type winding conductors are connected to two circumferentially adjacent sub-lines, and the two ends of the second-type winding conductors are arranged in the same slot layer.

[0023] Configured in this way, for the above-mentioned short-pitch windings, each type-I winding conductor in the sub-circuit is located in two specified stator slots. Therefore, the pitch of the type-I winding conductors in this sub-circuit is the same, and both ends of the type-I winding conductors are arranged across one slot layer, which helps to achieve the standardized design of the type-I winding conductors and simplifies the design, manufacturing, and assembly processes of the winding conductors. The series circuit is used to serially connect adjacent sub-circuits. The type-II winding conductors in the series circuit are arranged in the same slot layer, which helps to reduce the variety of pitches of the type-II winding conductors.

[0024] Overall, the average pitch of the winding conductors can be set relatively large, ensuring a lower overall winding weight under the premise of the same power density. Moreover, the variety of pitches of the winding conductors is small, which also helps to simplify their layout, reduce the manufacturing complexity of the winding conductors, and reduce the manufacturing cost. Brief Description of the Drawings

[0025] Figure 1 Schematic diagram of the topological structure of the short-pitch winding according to an embodiment of the present invention;

[0026] Figure 2 Schematic diagram showing the winding conductors of the short-pitch winding according to an embodiment of the present invention arranged in one layer;

[0027] Figure 3 Schematic diagram showing the winding conductors of the short-pitch winding according to an embodiment of the present invention arranged in two layers and three layers;

[0028] Figure 4 Schematic diagram showing the winding conductors of the short-pitch winding according to an embodiment of the present invention arranged in four layers and five layers;

[0029] Figure 5 Schematic diagram showing the winding conductors of the short-pitch winding according to an embodiment of the present invention arranged in six layers;

[0030] Figure 6 Schematic diagram of the structure of the type-I winding conductors according to an embodiment of the present invention;

[0031] Figure 7 Schematic diagram of the structure of a part of the type-II winding conductors according to an embodiment of the present invention;

[0032] Figure 8 Schematic diagram of the structure of another part of the type-II winding conductors according to an embodiment of the present invention;

[0033] Figure 9 Schematic diagram of the topological structure of the short-pitch winding according to another embodiment of the present invention;

[0034] Figure 10 Schematic diagram of the topological structure of the short-pitch winding according to another embodiment of the present invention;

[0035] Figure 11Schematic diagram of the topological structure of the short-pitch winding according to another embodiment of the present invention.

[0036] Among them, in the drawings:

[0037] 10 - stator core; 11 - stator slot;

[0038] 20 - winding conductor; 21 - type-one winding conductor; 22 - type-two winding conductor. Specific embodiments

[0039] The short-pitch winding, stator assembly and motor proposed by the present invention will be further described in detail below in conjunction with the drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0040] As used in the present invention, the singular forms "a", "an" and "the" include plural objects, the term "or" is usually used in the sense of including "and / or", the term "several" is usually used in the sense of including "at least one", the term "at least two" or "multiple" is usually used in the sense of including "two or more", in addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or at least two of such features. In addition, as used in the present invention, "mounted", "connected", "coupled", an element "disposed" on another element should be understood in a broad sense, usually only indicating that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the two elements can be directly or indirectly connected, coupled, cooperated or transmitted through an intermediate element, and cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, an element can be inside, outside, above, below or on one side of another element, etc. in any orientation, unless the content clearly indicates otherwise. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, etc. are used relative to the exemplary embodiments as shown in the drawings, with the upward or upper direction facing the top of the corresponding drawing and the downward or lower direction facing the bottom of the corresponding drawing.

[0041] The present invention provides a short-pitch winding, the short-pitch winding includes three-phase windings, and each branch of each phase winding includes a plurality of sub-lines and a plurality of series lines arranged at intervals in the circumferential direction;

[0042] One of the sub-circuits matches two stator slots. The sub-circuit includes a plurality of first-type winding conductors. The two ends of each first-type winding conductor in one of the sub-circuits respectively pass through the two stator slots, and the two ends of the first-type winding conductor are arranged across one slot layer.

[0043] That is, one sub-circuit corresponds to two specific stator slots.

[0044] Take Figure 1 the sub-circuit (6 layers, 2 slots) → (5 layers, 10 slots) → (4 layers, 2 slots) → (3 layers, 10 slots) → (2 layers, 2 slots) → (1 layer, 10 slots) as an example;

[0045] It includes five first-type winding conductors. The positions corresponding to the two ends of the five first-type winding conductors are respectively (6 layers, 2 slots) → (5 layers, 10 slots), (5 layers, 10 slots) → (4 layers, 2 slots), (4 layers, 2 slots) → (3 layers, 10 slots), (3 layers, 10 slots) → (2 layers, 2 slots), and (2 layers, 2 slots) → (1 layer, 10 slots).

[0046] Both ends of the above five first-type winding conductors are located in the two specified stator slots of 2 slots and 10 slots, and the two ends of each winding conductor are arranged across one slot layer (located in two adjacent layers).

[0047] The series circuit includes second-type winding conductors. The two ends of the second-type winding conductors are serially connected to two circumferentially adjacent sub-circuits, and the two ends of the second-type winding conductors are arranged in the same slot layer.

[0048] Take Figure 1 the series circuit (1 layer, 10 slots) → (1 layer, 20 slots) in the middle as an example. This series circuit corresponds to a second-type winding conductor. Both ends of the second-type winding conductor are located in the 1st layer and are used to serially connect the above sub-circuit and the adjacent sub-circuit.

[0049] The span of the above first-type winding conductor is the first span, and the span of the second-type winding conductor is the second span. The absolute value of the difference between the first span and the second span is less than or equal to 3.

[0050] For example, in this embodiment, the first span is 8 slots; the second span includes 7 slots and 10 slots. Such a setting is made to make both the first span and the second span relatively large and the difference between them relatively small, which is convenient for their processing. In other alternative embodiments, the second span can be adaptively set between 6 slots and 10 slots. Preferably, the second span is greater than or equal to 7 slots, that is, the second span is selected from 7 slots, 8 slots, 9 slots, 10 slots, and 11 slots. The second span can include two of the spans, or can include three, four, or five of the spans. Preferably, the number of span types included in the second span is less than or equal to three to reduce the number of span types of the entire winding.

[0051] Furthermore, the proportion of the first type of winding conductors in a branch is greater than 50% of all the winding conductors in that branch; the proportion of the second type of winding conductors in a branch is less than 50% of all the winding conductors in that branch. Overall, the average span of the winding conductors is relatively large, ensuring a lower overall winding weight on the premise of the same power density. Moreover, the number of span types of the winding conductors is small, which also helps to simplify their layout, reduce the manufacturing complexity of the winding conductors, and lower the manufacturing cost.

[0052] Furthermore, each phase winding is arranged in a plurality of circumferentially spaced stator slot groups, and each stator slot group includes four circumferentially adjacent stator slots;

[0053] Each phase winding is configured such that: this phase winding occupies all layers of the two stator slots located in the middle of the corresponding stator slot group, and partially occupies all layers of the two stator slots located at the edges of the corresponding stator slot group.

[0054] Taking Figure 1 phase U as an example, the U-phase winding is arranged in six stator slot groups, and each stator slot group includes four circumferentially adjacent stator slots. The six stator slot groups are slots 1 to 4, slots 10 to 13, slots 19 to 22, slots 28 to 31, slots 37 to 40, and slots 46 to 49.

[0055] Taking the stator slot group of slots 10 to 13 as an example, among them, slots 11 and 12 correspond to the two stator slots located in the middle of this stator slot group, and all layers (six layers) in slots 11 and 12 are occupied by the U-phase winding. Slots 10 and 13 correspond to the two stator slots located at the edges of this stator slot group, and some layers in slots 10 and 13 are occupied by the U-phase winding. Among them, layers 1, 3, and 5 of slot 10 are occupied, and the other layers are occupied by other phase windings; layers 2, 4, and 6 of slot 13 are occupied, and the other layers are occupied by other phase windings.

[0056] Furthermore, in the two stator slots located at the edges, the sum of the number of layers occupied by one phase winding is equal to the total number of layers of the stator slot.

[0057] Still taking Figure 1 the stator slot group of slots 10 to 13 as an example, among them, layers 1, 3, and 5 of slot 10 are occupied, and the number of occupied layers is 3 layers; layers 2, 4, and 6 of slot 13 are occupied, and the number of occupied layers is also 3 layers. The sum of the number of occupied layers of slot 10 and the number of occupied layers of slot 13 is 6 layers, which is equal to the number of layers in each stator slot (6 layers).

[0058] In the two stator slots located at the edges, the layers occupied in one stator slot do not overlap with the layers occupied in the other stator slot. Still taking Figure 1Taking the stator slot group from slot 10 to slot 13 as an example, if the 1st, 3rd, and 5th layers of slot 10 are occupied, then the 1st, 3rd, and 5th layers of slot 13 will not be occupied. Therefore, the 2nd, 4th, and 6th layers of slot 13 are occupied. At this time, the occupied layers in the two slots do not overlap.

[0059] Further, in this embodiment, the short-pitch winding is based on a topological structure of 54 slots and 6 poles with n layers, and n is 6.

[0060] In other alternative embodiments, the number of layers n can be other integers greater than or equal to 2, such as 2, 3, 4, 5, etc. The connection manner of each branch is similar to the above connection manner, and will not be elaborated here too much.

[0061] In other alternative embodiments, the number of pole pairs of the stator can be p, and the number of pole pairs p of the stator can be adaptively designed according to the performance requirements of the motor. For example, the number of poles of the motor can be even numbers such as 2, 4, 8, etc. Those skilled in the art can adaptively design the number of poles of the motor according to actual application requirements. In addition, the number of slots of the short-pitch winding can be z, the number of phases of the flat wire winding 200 is m, and the number of winding lines of each phase winding is f. Therefore, the stator slots z = m * 2p * f, where p is the number of pole pairs of the motor. Since the motor is usually constructed as a three-phase motor, m is exemplarily designed as 3. Therefore, the number of stator slots can be z = 3 * 2p * f, and f is a natural number greater than or equal to 1. For example, in this embodiment, the short-pitch winding p = 3 and f = 3, so the number of stator slots z is 54.

[0062] Each phase winding of the three-phase winding includes three branches arranged in parallel; and the three-phase winding is arranged in spatial central symmetry to eliminate the circulating current between the branches, so that the potentials of the parallel branches of the same-phase winding are balanced.

[0063] Combined with Figures 1 to 3 As shown, this embodiment further illustrates by taking the short-pitch winding based on a topological structure of 54 slots, 6 poles and 6 layers as an example.

[0064] The short-pitch winding includes a three-phase winding. Each phase winding of the three-phase winding includes three branches arranged in parallel. The three-phase winding is arranged in spatial central symmetry to eliminate the circulating current between the branches, so that the potentials of the parallel branches of the same-phase winding are balanced.

[0065] Each branch of each phase winding includes a plurality of winding conductors 20. The winding conductors in each branch are divided into a first type of winding conductor 21 and a second type of winding conductor 22. The span of the first type of winding conductor 21 is 8 slots, and the spans of the second type of winding conductor 22 include 7 slots and 10 slots, that is, among the second type of winding conductor 22, some winding conductors have a span of 7 slots and some winding conductors have a span of 10 slots.

[0066] The proportion of the first type of winding conductors 21 in a branch to all the winding conductors in that branch is greater than 50%; the proportion of the second type of winding conductors 22 in a branch to all the winding conductors in that branch is less than 50%.

[0067] For the above short-pitch winding, most of the winding conductors (the first type of winding conductors 21) have a larger pitch, and the remaining winding conductors (the second type of winding conductors 22) have pitches on both sides of the pitch of the first type of winding conductors 21 (that is, some are greater than the pitch of the first type of winding conductors, and some are less than the pitch of the first type of winding conductors). Overall, the average pitch of the winding conductors is relatively large, ensuring a lower overall winding weight on the premise of the same power density. Moreover, the number of types of pitches of the winding conductors is small, which is also conducive to simplifying their arrangement method, reducing the manufacturing complexity of the winding conductors, and reducing the manufacturing cost.

[0068] Specifically, in this embodiment, the proportion of the first type of winding conductors 21 in a branch to all the winding conductors in that branch is greater than 60%, specifically 2 / 3, and the proportion of the second type of winding conductors 22 in that branch to all the winding conductors in that branch is less than 40%, specifically 1 / 3. Among them, the proportion of the winding conductors with a pitch of 7 slots in the second type of winding conductors 22 to all the winding conductors in that branch is 1 / 9, and the proportion of the winding conductors with a pitch of 10 slots in the second type of winding conductors 22 to all the winding conductors in that branch is 2 / 9.

[0069] The following combines Figures 1 to 8 to illustrate the specific distribution structure of each winding of the three-phase winding.

[0070] Combined with Figure 1 As shown, the three-phase windings (U / V / W) in the slots are symmetrically arranged in space, and the three-phase windings are arranged in sequence and cycle to fill 54 stator slots.

[0071] In this embodiment, only the U-phase winding is taken as an example, and the other two-phase windings can be symmetrically arranged.

[0072] As Figures 2 to 5 shown, in this embodiment, the stator core 10 is introduced to further clearly illustrate the setting method of the short-pitch winding. Figures 2 to 5 Among them, the short-pitch winding is arranged in the stator core and forms a part of the stator assembly.

[0073] As Figures 2 to 5 shown, 54 stator slots 11 are provided on the stator core 10, and the slot numbers of the 54 slots are configured to be 1, 2, 3,..., 52, 53, and 54 in sequence along the circumferential direction of the stator core; the layer numbers of the 6 layers of each slot are configured to be 1, 2, 3, 4, 5, and 6 in sequence from the outside to the inside along the radial direction of the stator core, that is, the innermost layer of the stator slot 11 is layer 1, and the outermost layer is layer 6. To visually display the setting method of the winding conductors, the present invention passes through Figures 2 to 5Show the arrangement of the winding conductors in the stator slots 11, where Figure 2 Show the winding conductors in the stator slots 11 at layer 1, Figure 3 Show the winding conductors in the stator slots 11 at layers 2 and 3, Figure 4 Show the winding conductors in the stator slots 11 at layers 4 and 5, Figure 5 Show the winding conductors in the stator slots 11 at layer 6.

[0074] Combined with Figure 1 as shown, Figure 1 the abscissa corresponds to the slot number and the ordinate corresponds to the layer number.

[0075] Combined with Figure 1 as shown, where the complete circuit connection of the first branch of the U-phase winding is: (layer 6, slot 2) → (layer 5, slot 10) → (layer 4, slot 2) → (layer 3, slot 10) → (layer 2, slot 2) → (layer 1, slot 10) → (layer 1, slot 20) → (layer 2, slot 12) → (layer 3, slot 20) → (layer 4, slot 12) → (layer 5, slot 20) → (layer 6, slot 12) → (layer 6, slot 22) → (layer 5, slot 30) → (layer 4, slot 22) → (layer 3, slot 30) → (layer 2, slot 22) → (layer 1, slot 30) → (layer 1, slot 37) → (layer 2, slot 29) → (layer 3, slot 37) → (layer 4, slot 29) → (layer 5, slot 37) → (layer 6, slot 29) → (layer 6, slot 39) → (layer 5, slot 47) → (layer 4, slot 39) → (layer 3, slot 47) → (layer 2, slot 39) → (layer 1, slot 47) → (layer 1, slot 3) → (layer 2, slot 49) → (layer 3, slot 3) → (layer 4, slot 49) → (layer 5, slot 3) → (layer 6, slot 49) → (layer 6, slot 2);

[0076] The above first branch includes six sub-branches,

[0077] (layer 6, slot 2) → (layer 5, slot 10) → (layer 4, slot 2) → (layer 3, slot 10) → (layer 2, slot 2) → (layer 1, slot 10) is a sub-circuit in the first branch;

[0078] (layer 1, slot 20) → (layer 2, slot 12) → (layer 3, slot 20) → (layer 4, slot 12) → (layer 5, slot 20) → (layer 6, slot 12) is a sub-circuit in the first branch;

[0079] (layer 6, slot 22) → (layer 5, slot 30) → (layer 4, slot 22) → (layer 3, slot 30) → (layer 2, slot 22) → (layer 1, slot 30) is a sub-circuit in the first branch;

[0080] (1 layer, 37 slots) → (2 layers, 29 slots) → (3 layers, 37 slots) → (4 layers, 29 slots) → (5 layers, 37 slots) → (6 layers, 29 slots) is a sub-circuit in the first branch;

[0081] (6 layers, 39 slots) → (5 layers, 47 slots) → (4 layers, 39 slots) → (3 layers, 47 slots) → (2 layers, 39 slots) → (1 layer, 47 slots) is a sub-circuit in the first branch;

[0082] (1 layer, 3 slots) → (2 layers, 49 slots) → (3 layers, 3 slots) → (4 layers, 49 slots) → (5 layers, 3 slots) → (6 layers, 49 slots) is a sub-circuit in the first branch;

[0083] The corresponding ones in the above sub-branches are a type of winding conductor, and the span at both ends of this winding conductor is 8 slots;

[0084] Among them, (1 layer, 10 slots) → (1 layer, 20 slots), (6 layers, 12 slots) → (6 layers, 22 slots), (6 layers, 29 slots) → (6 layers, 39 slots), and (1 layer, 47 slots) → (1 layer, 3 slots) are four groups of series branches, and they correspond to the second type of winding conductor 22. The span at both ends of this winding conductor is 10 slots; Combined Figure 6 As shown, this winding conductor is of U-pin structure.

[0085] Among them, (1 layer, 30 slots) → (1 layer, 37 slots) and (6 layers, 49 slots) → (6 layers, 2 slots) are two groups of series branches, corresponding to the second type of winding conductor 22. The span at both ends of this winding conductor is 7 slots; Combined Figure 7 As shown, this winding conductor is of U-pin structure.

[0086] Both ends of the second type of winding conductor 22 are arranged in the same slot layer. Arranging in the same slot layer means that both ends of the winding conductor are located in or pass through the same slot layer.

[0087] Taking Figure 6 the winding conductor as an example, its span is 10 slots and it is arranged in the same slot layer. When the circuit connection of this winding conductor is (1 layer, 10 slots) → (1 layer, 20 slots), one end is located (or passes through) in slot 10, and the other end is located (or passes through) in slot 20. Therefore, the span between the two is 10 slots; One end is located (or passes through) in layer 1 of slot 10, and the other end is located (or passes through) in layer 1 of slot 20, that is, both ends of this winding conductor are located in (or pass through) layer 1, belonging to arranging in the same slot layer.

[0088] Taking Figure 7Taking the winding conductor in as an example, its span is 7 slots and it is arranged in the same slot layer. When the circuit connection of this winding conductor is (layer 1, slot 30) → (layer 1, slot 37), one end is located (or passes through) inside slot 30, and the other end is located (or passes through) inside slot 37. Therefore, the span between the two is 7 slots; one end is located (or passes through) in layer 1 of slot 30, and the other end is located (or passes through) in layer 1 of slot 37, that is, both ends of this winding conductor are located (or pass through) in layer 1, belonging to the same slot layer arrangement.

[0089] The other winding conductors in the first branch except the said type-two winding conductors 22 are type-one winding conductors 21. The span between the two ends of this winding conductor is 8 slots; as shown in Figure 8 shown, this winding conductor is of the Ux-pin structure.

[0090] The two ends of the said type-one winding conductor 21 are arranged with a span of one slot layer. Arranging with a span of one slot layer means that the difference in the layer numbers where the two ends of the winding conductor are located (or pass through) is 1, that is, they are located in adjacent layers.

[0091] Taking Figure 8 the winding conductor in as an example, its span is 8 slots and it is arranged with a span of one slot layer. When the circuit connection of this winding conductor is (layer 6, slot 2) → (layer 5, slot 10), one end is located (or passes through) inside slot 2, and the other end is located (or passes through) inside slot 10. Therefore, the span between the two is 8 slots; one end is located (or passes through) in layer 6 of slot 2, and the other end is located (or passes through) in layer 5 of slot 10, that is, the two ends of this winding conductor are respectively located (or pass through) in layer 6 and layer 5, belonging to the arrangement with a span of one slot layer. This arrangement method can make the deformation of the winding conductor smaller, reduce the overall length of the winding conductor, and is also beneficial to the connection of adjacent conductors.

[0092] Similarly, please refer to Figure 1 shown, the complete circuit connection of the second branch of the U-phase winding is: (layer 6, slot 3) → (layer 5, slot 11) → (layer 4, slot 3) → (layer 3, slot 11) → (layer 2, slot 3) → (layer 1, slot 11) → (layer 1, slot 21) → (layer 2, slot 13) → (layer 3, slot 21) → (layer 4, slot 13) → (layer 5, slot 21) → (layer 6, slot 13) → (layer 6, slot 23) → (layer 5, slot 31) → (layer 4, slot 23) → (layer 3, slot 31) → (layer 2, slot 23) → (layer 1, slot 31) → (layer 1, slot 38) → (layer 2, slot 30) → (layer 3, slot 38) → (layer 4, slot 30) → (layer 5, slot 38) → (layer 6, slot 30) → (layer 6, slot 40) → (layer 5, slot 48) → (layer 4, slot 40) → (layer 3, slot 48) → (layer 2, slot 40) → (layer 1, slot 48) → (layer 1, slot 4) → (layer 2, slot 50) → (layer 3, slot 4) → (layer 4, slot 50) → (layer 5, slot 4) → (layer 6, slot 50) → (layer 6, slot 3);

[0093] The second branch circuit includes six sub-branch circuits,

[0094] (6 layers, 3 slots) → (5 layers, 11 slots) → (4 layers, 3 slots) → (3 layers, 11 slots) → (2 layers, 3 slots) → (1 layer, 11 slots) is a sub-circuit in the second branch circuit;

[0095] (1 layer, 21 slots) → (2 layers, 13 slots) → (3 layers, 21 slots) → (4 layers, 13 slots) → (5 layers, 21 slots) → (6 layers, 13 slots) is a sub-circuit in the second branch circuit;

[0096] (6 layers, 23 slots) → (5 layers, 31 slots) → (4 layers, 23 slots) → (3 layers, 31 slots) → (2 layers, 23 slots) → (1 layer, 31 slots) is a sub-circuit in the second branch circuit;

[0097] (1 layer, 38 slots) → (2 layers, 30 slots) → (3 layers, 38 slots) → (4 layers, 30 slots) → (5 layers, 38 slots) → (6 layers, 30 slots) is a sub-circuit in the second branch circuit;

[0098] (6 layers, 40 slots) → (5 layers, 48 slots) → (4 layers, 40 slots) → (3 layers, 48 slots) → (2 layers, 40 slots) → (1 layer, 48 slots) is a sub-circuit in the second branch circuit;

[0099] (1 layer, 4 slots) → (2 layers, 50 slots) → (3 layers, 4 slots) → (4 layers, 50 slots) → (5 layers, 4 slots) → (6 layers, 50 slots) is a sub-circuit in the second branch circuit;

[0100] The corresponding ones in the above sub-branch circuits are a kind of winding conductors, and the span at both ends of this winding conductor is 8 slots;

[0101] Among them, (1 layer, 11 slots) → (1 layer, 21 slots), (6 layers, 13 slots) → (6 layers, 23 slots), (6 layers, 30 slots) → (6 layers, 40 slots), and (1 layer, 48 slots) → (1 layer, 4 slots) are four groups of series branch circuits, and they correspond to the second kind of winding conductors 22, and the span at both ends of this winding conductor is 10 slots;

[0102] Among them, (1 layer, 31 slots) → (1 layer, 38 slots) and (6 layers, 50 slots) → (6 layers, 3 slots) are two groups of series branch circuits, corresponding to the second kind of winding conductors 22, and the span at both ends of this winding conductor is 7 slots;

[0103] The remaining winding conductors are the first kind of winding conductors 21.

[0104] Similarly, please refer to Figure 1As shown, the complete circuit connection of the third branch of the U-phase winding is: (Layer 6, Slot 4) → (Layer 5, Slot 12) → (Layer 4, Slot 4) → (Layer 3, Slot 12) → (Layer 2, Slot 4) → (Layer 1, Slot 12) → (Layer 1, Slot 22) → (Layer 2, Slot 14) → (Layer 3, Slot 22) → (Layer 4, Slot 14) → (Layer 5, Slot 22) → (Layer 6, Slot 14) → (Layer 6, Slot 24) → (Layer 5, Slot 32) → (Layer 4, Slot 24) → (Layer 3, Slot 32) → (Layer 2, Slot 24) → (Layer 1, Slot 32) → (Layer 1, Slot 39) → (Layer 2, Slot 31) → (Layer 3, Slot 39) → (Layer 4, Slot 31) → (Layer 5, Slot 39) → (Layer 6, Slot 31) → (Layer 6, Slot 41) → (Layer 5, Slot 49) → (Layer 4, Slot 41) → (Layer 3, Slot 49) → (Layer 2, Slot 41) → (Layer 1, Slot 49) → (Layer 1, Slot 5) → (Layer 2, Slot 51) → (Layer 3, Slot 5) → (Layer 4, Slot 51) → (Layer 5, Slot 5) → (Layer 6, Slot 51) → (Layer 6, Slot 4),

[0105] The above-mentioned third branch includes six sub-branches.

[0106] (Layer 6, Slot 4) → (Layer 5, Slot 12) → (Layer 4, Slot 4) → (Layer 3, Slot 12) → (Layer 2, Slot 4) → (Layer 1, Slot 12) is a sub-circuit in the second branch;

[0107] (Layer 1, Slot 22) → (Layer 2, Slot 14) → (Layer 3, Slot 22) → (Layer 4, Slot 14) → (Layer 5, Slot 22) → (Layer 6, Slot 14) is a sub-circuit in the second branch;

[0108] (Layer 6, Slot 24) → (Layer 5, Slot 32) → (Layer 4, Slot 24) → (Layer 3, Slot 32) → (Layer 2, Slot 24) → (Layer 1, Slot 32) is a sub-circuit in the second branch;

[0109] (Layer 1, Slot 39) → (Layer 2, Slot 31) → (Layer 3, Slot 39) → (Layer 4, Slot 31) → (Layer 5, Slot 39) → (Layer 6, Slot 31) is a sub-circuit in the second branch;

[0110] (Layer 6, Slot 41) → (Layer 5, Slot 49) → (Layer 4, Slot 41) → (Layer 3, Slot 49) → (Layer 2, Slot 41) → (Layer 1, Slot 49) is a sub-circuit in the second branch;

[0111] (Layer 1, Slot 5) → (Layer 2, Slot 51) → (Layer 3, Slot 5) → (Layer 4, Slot 51) → (Layer 5, Slot 5) → (Layer 6, Slot 51) is a sub-circuit in the second branch;

[0112] The corresponding ones in the above sub-branches are a type of winding conductor, and the span at both ends of this winding conductor is 8 slots.

[0113] Among them, (1 layer, 12 slots) → (1 layer, 22 slots), (6 layers, 14 slots) → (6 layers, 24 slots), (6 layers, 31 slots) → (6 layers, 41 slots), and (1 layer, 49 slots) → (1 layer, 5 slots) are four groups of series branches, and correspondingly are the second - type winding conductors 22. The span at both ends of this winding conductor is 10 slots.

[0114] Among them, (1 layer, 32 slots) → (1 layer, 39 slots) and (6 layers, 51 slots) → (6 layers, 4 slots) are two groups of series branches, corresponding to the second - type winding conductors 22. The span at both ends of this winding conductor is 7 slots; the remaining winding conductors are the first - type winding conductors 21.

[0115] The second - type winding conductors 22 in the second branch and the third branch are also arranged in the same - slot - layer setting mode similar to that in the first branch, and the first - type winding conductors 21 are also arranged in the one - slot - layer - spanning setting mode similar to that in the first branch, which will not be elaborated here.

[0116] The above - mentioned first branch, second branch, and third branch are connected in parallel to form a complete circuit connection of the U - phase winding. Since the three - phase windings (U / V / W) are symmetrically arranged in space, the circuit connections of the remaining two - phase windings are naturally determined and will not be elaborated here.

[0117] In the above - mentioned embodiment, the short - pitch winding has a topological structure of 54 slots, 6 poles, and 6 layers. Under the same motor size, the improvement of the topological structure in this embodiment can bring an increase in the comprehensive efficiency of the motor under the CLTC (China Light - duty Vehicle Test Cycle), and achieve a copper conductor savings of greater than or equal to 0.3 kg.

[0118] Combined with Figure 9 As shown, it is another implementation structure of the short - pitch winding, and this short - pitch winding is based on a topological structure of 54 slots, 6 poles, and 6 layers.

[0119] Combined with Figure 9 As shown, the three - phase windings (U / V / W) in the slots are symmetrically arranged in space, and the three - phase windings are arranged in sequence and cyclically to fill all 54 stator slots.

[0120] In this embodiment, only the U - phase winding is taken as an example, and the other two - phase windings can be symmetrically arranged.

[0121] Figure 9 Each phase winding in

[0122] The complete circuit connection of the U-phase winding branch is: (6 layers, 13 slots) → (5 layers, 21 slots) → (4 layers, 13 slots) → (3 layers, 21 slots) → (2 layers, 13 slots) → (1 layer, 21 slots) → (1 layer, 28 slots) → (2 layers, 20 slots) → (3 layers, 28 slots) → (4 layers, 20 slots) → (5 layers, 28 slots) → (6 layers, 20 slots) → (6 layers, 11 slots) → (5 layers, 19 slots) → (4 layers, 11 slots) → (3 layers, 19 slots) → (2 layers, 11 slots) → (1 layer, 19 slots) → (1 layer, 11 slots) → (2 layers, 3 slots) → (3 layers, 11 slots) → (4 layers, 3 slots) → (5 layers, 11 slots) → (6 layers, 3 slots) → (6 layers, 12 slots) → (5 layers, 2 0 slots) → (4th floor, 12 slots) → (3rd floor, 20 slots) → (2nd floor, 12 slots) → (1st floor, 20 slots) → (1st floor, 12 slots) → (2nd floor, 4 slots) → (3rd floor, 12 slots) → (4th floor, 4 slots) → (5th floor, 12 slots) → (6th floor, 4 slots) → (6th floor, 49 slots) → (5th floor, 3 slots) → (4th floor, 49 slots) → (3rd floor, 3 slots) → (2-layer, 49 slots) → (1-layer, 3 slots) → (1-layer, 10 slots) → (2-layer, 2 slots) → (3-layer, 10 slots) → (4-layer, 2 slots) → (5-layer, 10 slots) → (6-layer, 2 slots) → (6-layer, 47 slots) → (5-layer, 1 slot) → (4-layer, 47 slots) → (3-layer, 1 slot) → (2-layer, 47 slots) → (1-layer, 1 slot) → ( 1st floor, 47 slots) → (2nd floor, 39 slots) → (3rd floor, 47 slots) → (4th floor, 39 slots) → (5th floor, 47 slots) → (6th floor, 39 slots) → (6th floor, 48 slots) → (5th floor, 2 slots) → (4th floor, 48 slots) → (3rd floor, 2 slots) → (2th floor, 48 slots) → (1st floor, 2 slots) → (1st floor, 48 slots) → (2nd floor, 40 slots) → (3rd floor, 48 slots) → (4th floor, 40 slots) → (5th floor, 48 slots) → (6th floor, 40 slots) → (6th floor, 31 slots) → (5th floor, 39 slots) → (4th floor, 31 slots) → (3rd floor, 39 slots) → (2nd floor, 31 slots) → (1st floor, 39 slots) → (1st floor, 46 slots) → (2nd floor, 38 slots) → (3rd floor, 46 slots) → (4th floor, 38 slots) → (5th floor, 46 slots) → (6th floor, 38 slots) → (6th floor, 29 slots) → (5th floor, 37 slots) → (4th floor, 29 slots) → (3rd floor, 37 slots) → (2nd floor, 29 slots) → (1st floor, 37 slots) → (1st floor, 29 slots) → (2nd floor, 21 slots) → (3rd floor, 29 slots) → (4th floor, 21 slots) → (5th floor, 29 slots) → (6th floor , 21 slots) → (6-layer, 30 slots) → (5-layer, 38 slots) → (4-layer, 30 slots) → (3-layer, 38 slots) → (2-layer, 30 slots) → (1-layer, 38 slots) → (1-layer, 30 slots) → (2-layer, 22 slots) → (3-layer, 30 slots) → (4-layer, 22 slots) → (5-layer, 30 slots) → (6-layer, 22 slots) → (6-layer, 13 slots);

[0123] In this embodiment, the first span is 8 slots, and the second span includes 7 slots, 8 slots, and 9 slots. For example, the conductor from (1 layer, 21 slots) to (1 layer, 28 slots) is the second span, with a span of 7 slots; the conductor from (1 layer, 19 slots) to (1 layer, 11 slots) is the second span, with a span of 8 slots; the conductor from (6 layers, 20 slots) to (6 layers, 11 slots) is the second span, with a span of 9 slots.

[0124] Combined with Figure 10 As shown, it is another implementation structure of the short-pitch winding, which is based on a 54-slot 6-pole 6-layer topology.

[0125] Combined with Figure 10 As shown, the three-phase windings (U / V / W) in the slots are symmetrically arranged in space, and the three-phase windings are sequentially and circularly arranged to fill 54 stator slots.

[0126] In this embodiment, only the U-phase winding is taken as an example, and the other two-phase windings can be symmetrically arranged.

[0127] Figure 10 Each phase winding in

[0128] The complete circuit connection of the first branch of the U-phase winding is: (1 layer, 48 slots) → (2 layer, 40 slots) → (3 layer, 48 slots) → (4 layer, 40 slots) → (5 layer, 48 slots) → (6 layer, 40 slots) → (6 layer, 48 slots) → (5 layer, 2 slots) → (4 layer, 48 slots) → (3 layer, 2 slots) → (2 layer, 48 slots) → (1 layer, 2 slots) → (1 layer, 12 slots) → (2 layer, 4 slots) → (3 layer, 12 slots) → (4 layer, 4 slots) → (5 layer, 12 slots) → (6 layer, 4 slots) → (6 layer, 12 slots) → (5 layer, 20 slots) → (4 layer, 12 slots) → (3 layer, 20 slots) → (2 layer, 12 slots) → (1 layer, 20 slots) → (1 layer, 30 slots) → (2 layer, 22 slots) → (3 layer, 30 slots) → (4 layer, 22 slots) → (5 layer, 30 slots) → (6 layer, 22 slots) → (6 layer, 30 slots) → (5 layer, 38 slots) → (4 layer, 30 slots) → (3 layer, 38 slots) → (2 layer, 30 slots) → (1 layer, 38 slots) → (1 layer, 31 slots) → (2 layer, 23 slots) → (3 layer, 31 slots) → (4 layer, 23 slots) → (5 layer, 31 slots) → (6 layer, 23 slots) → (6 layer, 14 slots) → (5 layer, 22 slots) → (4 layer, 14 slots) → (3 layer, 22 slots) → (2 layer, 14 slots) → (1 layer, 22 slots) → (1 layer, 13 slots) → (2 layer, 5 slots) → (3 layer, 13 slots) → (4 layer, 5 slots) → (5 layer, 13 slots) → (6 layer, 5 slots);

[0129] In this branch, the first span is 8 slots, and the second span includes 7 slots, 9 slots, and 10 slots. Among them, the conductor spans of (layer 1, slot 2) → (layer 1, slot 12) and (layer 1, slot 20) → (layer 1, slot 30) are 10 slots; the conductor spans of (layer 6, slot 23) → (layer 6, slot 14) and (layer 1, slot 22) → (layer 1, slot 13) are 9 slots; the winding span of (layer 1, slot 38) → (layer 1, slot 31) is 7 slots.

[0130] The complete circuit connection of the second branch of the U-phase winding is: (layer 6, slot 50) → (layer 5, slot 4) → (layer 4, slot 50) → (layer 3, slot 4) → (layer 2, slot 50) (layer 1, slot 4) → (layer 1, slot 49) → (layer 2, slot 41) → (layer 3, slot 49) → (layer 4, slot 41) → (layer 5, slot 49) → (layer 6, slot 41) → (layer 6, slot 32) → (layer 5, slot 40) → (layer 4, slot 32) → (layer 3, slot 40) → (layer 2, slot 32) → (layer 1, slot 40) → (layer 1, slot 29) → (layer 2, slot 21) → (layer 3, slot 29) → (layer 4, slot 21) → (layer 5, slot 29) (layer 6, slot 21) → (layer 6, slot 13) → (layer 5, slot 21) → (layer 4, slot 13) → (layer 3, slot 21) → (layer 2, slot 13) → (layer 1, slot 21) → (layer 1, slot 11) → (layer 2, slot 3) → (layer 3, slot 11) → (layer 4, slot 3) → (layer 5, slot 11) → (layer 6, slot 3) → (layer 6, slot 49) → (layer 5, slot 3) → (layer 4, slot 49) → (layer 3, slot 3) → (layer 2, slot 49) → (layer 1, slot 3) → (layer 1, slot 47) → (layer 2, slot 39) → (layer 3, slot 47) → (layer 4, slot 39) → (layer 5, slot 47) → (layer 6, slot 39) → (layer 6, slot 31) → (layer 5, slot 39) → (layer 4, slot 31) → (layer 3, slot 39) → (layer 2, slot 31) → (layer 1, slot 39);

[0131] In this branch, the first span is 8 slots, and the second span includes 9 slots, 10 slots, and 11 slots; among them, the conductor span of (layer 1, slot 40) → (layer 1, slot 29) is 11 slots; the conductor spans of (layer 1, slot 21) → (layer 1, slot 11) and (layer 1, slot 3) → (layer 1, slot 47) are 10 slots; the conductor spans of (layer 1, slot 4) → (layer 1, slot 49) and (layer 6, slot 41) → (layer 6, slot 32) are 9 slots.

[0132] Combined with Figure 11 shown, it is another implementation structure of the short-pitch winding, and this short-pitch winding is based on a 54-slot 6-pole 6-layer topology.

[0133] Combined with Figure 11 shown, the three-phase windings (U / V / W) in the slots are symmetrically arranged in space, and the three-phase windings are sequentially and circularly arranged to fill 54 stator slots.

[0134] In this embodiment, only the U-phase winding is taken as an example, and the other two-phase windings can be symmetrically arranged.

[0135] Figure 11 Each phase winding in [reference] includes three branches.

[0136] Combined with Figure 11 As shown, the complete circuit connection of the first branch of the U-phase winding is: (6th layer, 2 slots) → (5th layer, 10 slots) → (4th layer, 2 slots) → (3rd layer, 10 slots) → (2nd layer, 2 slots) → (1st layer, 10 slots) → (1st layer, 19 slots) → (2nd layer, 11 slots) → (3rd layer, 19 slots) → (4th layer, 11 slots) → (5th layer, 19 slots) → (6th layer, 11 slots) → (6th layer, 21 slots) → (5th layer, 29 slots) → (4th layer, 21 slots) → (3rd layer, 29 slots) → (2nd layer, 21 slots) → (1st layer, 29 slots) → (1st layer, 38 slots) → (2nd layer, 30 slots) → (3rd layer, 38 slots) → (4th layer, 30 slots) → (5th layer, 38 slots) → (6th layer, 30 slots) → (6th layer, 40 slots) → (5th layer, 48 slots) → (4th layer, 40 slots) → (3rd layer, 48 slots) → (2nd layer, 40 slots) → (1st layer, 48 slots) → (1st layer, 3 slots) → (2nd layer, 49 slots) → (3rd layer, 3 slots) → (4th layer, 49 slots) → (5th layer, 3 slots) → (6th layer, 49 slots) → (6th layer, 2 slots);

[0137] In this branch, the first span is 8 slots, and the second span includes 9 slots and 10 slots. For example, the conductor from (1st layer, 21 slots) to (1st layer, 28 slots) is the second span, and its span is 7 slots; the conductor from (1st layer, 10 slots) to (1st layer, 19 slots) is the second span, and its span is 9 slots; the conductor from (6th layer, 30 slots) to (6th layer, 40 slots) is the second span, and its span is 10 slots.

[0138] The complete circuit connection of the second branch of the U-phase winding is: (Layer 6, Slot 3) → (Layer 5, Slot 11) → (Layer 4, Slot 3) → (Layer 3, Slot 11) → (Layer 2, Slot 3) → (Layer 1, Slot 11) → (Layer 1, Slot 20) → (Layer 2, Slot 12) → (Layer 3, Slot 20) → (Layer 4, Slot 12) → (Layer 5, Slot 20) → (Layer 6, Slot 12) → (Layer 6, Slot 22) → (Layer 5, Slot 30) → (Layer 4, Slot 22) → (Layer 3, Slot 30) → (Layer 2, Slot 22) → (Layer 1, Slot 30) → (Layer 1, Slot 39) → (Layer 2, Slot 31) → (Layer 3, Slot 39) → (Layer 4, Slot 31) → (Layer 5, Slot 39) → (Layer 6, Slot 31) → (Layer 6, Slot 38) → (Layer 5, Slot 46) → (Layer 4, Slot 38) → (Layer 3, Slot 46) → (Layer 2, Slot 38) → (Layer 1, Slot 46) → (Layer 1, Slot 1) → (Layer 2, Slot 47) → (Layer 3, Slot 1) → (Layer 4, Slot 47) → (Layer 5, Slot 1) → (Layer 6, Slot 47) → (Layer 6, Slot 2);

[0139] In this branch, the first span is 8 slots, and the second span includes 7 slots, 9 slots, and 10 slots. For example, the conductor from (Layer 6, Slot 31) to (Layer 6, Slot 38) is the second span with a span of 7 slots; the conductor from (Layer 1, Slot 11) to (Layer 1, Slot 20) is the second span with a span of 9 slots; the conductor from (Layer 6, Slot 12) to (Layer 6, Slot 22) is the second span with a span of 10 slots.

[0140] The complete circuit connection of the third branch of the U-phase winding is: (Layer 6, Slot 4) → (Layer 5, Slot 12) → (Layer 4, Slot 4) → (Layer 3, Slot 12) → (Layer 2, Slot 4) → (Layer 1, Slot 12) → (Layer 1, Slot 21) → (Layer 2, Slot 13) → (Layer 3, Slot 21) → (Layer 4, Slot 13) → (Layer 5, Slot 21) → (Layer 6, Slot 13) → (Layer 6, Slot 20) → (Layer 5, Slot 28) → (Layer 4, Slot 20) → (Layer 3, Slot 28) → (Layer 2, Slot 20) → (Layer 1, Slot 28) → (Layer 1, Slot 37) → (Layer 2, Slot 29) → (Layer 3, Slot 37) → (Layer 4, Slot 29) → (Layer 5, Slot 37) → (Layer 6, Slot 29) → (Layer 6, Slot 39) → (Layer 5, Slot 47) → (Layer 4, Slot 39) → (Layer 3, Slot 47) → (Layer 2, Slot 39) → (Layer 1, Slot 47) → (Layer 1, Slot 2) → (Layer 2, Slot 28) → (Layer 3, Slot 2) → (Layer 4, Slot 548) → (Layer 5, Slot 2) → (Layer 6, Slot 48) → (Layer 6, Slot 4);

[0141] In this branch, the first span is 8 slots, and the second span includes 7 slots, 9 slots, and 10 slots. For example, the conductor from (6 layers, 13 slots) to (6 layers, 20 slots) is the second span, and its span is 7 slots; the conductor from (1 layer, 12 slots) to (1 layer, 21 slots) is the second span, and its span is 9 slots; the conductor from (6 layers, 29 slots) to (6 layers, 39 slots) is the second span, and its span is 10 slots.

[0142] This embodiment also provides a stator assembly, which includes the short-pitch winding described above. In addition, the stator assembly further includes a stator core and a welded end copper bar. The welded end copper bar includes parallel copper bars, and multiple branches of one phase of the short-pitch winding are paralleled through the parallel copper bars. The short-pitch winding is arranged in the slots of the stator core through the above-mentioned branches. Since multiple branches of one phase of the short-pitch winding are known, the arrangement method of the short-pitch winding on the stator core is known, and will not be elaborated here.

[0143] This embodiment also provides a motor, which includes the short-pitch winding described above, as well as a stator core, a welded end copper bar, a rotor, and a housing, etc. Since multiple branches of one phase of the short-pitch winding are known, the arrangement method of the short-pitch winding on the stator core is known. In addition, the assembly and connection methods of components such as the stator core, the welded end copper bar, the rotor, and the housing can all adopt the prior art, and will not be elaborated here.

[0144] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0145] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the technical field of the present invention according to the above disclosure shall fall within the protection scope of the claims.

Claims

1. A short-pitch winding, characterized in that the short-pitch winding comprises a three-phase winding, and each branch of each phase winding comprises a plurality of sub-circuits and a plurality of series circuits which are arranged at intervals in the circumferential direction; one sub-circuit matches two stator slots, the sub-circuit comprises a plurality of first-type winding conductors, and the two ends of each first-type winding conductor in one sub-circuit respectively pass through the two stator slots, and the two ends of the first-type winding conductor are arranged across one slot layer; the series circuit comprises second-type winding conductors, and the two ends of the second-type winding conductors are connected to two circumferentially adjacent sub-circuits, and the two ends of the second-type winding conductors are arranged in the same slot layer.

2. The short-pitch winding according to claim 1, characterized in that, Each phase winding is arranged in a plurality of circumferentially spaced stator slot groups, and each stator slot group comprises four circumferentially adjacent stator slots; each phase winding is configured such that: the phase winding occupies all layers of the two middle stator slots in the corresponding stator slot group and partially occupies all layers of the two edge stator slots in the corresponding stator slot group.

3. The short-pitch winding according to claim 2, characterized in that, In the two edge stator slots, the sum of the number of layers occupied by the phase winding is equal to the total number of layers of the stator slots.

4. The short-pitch winding according to claim 1, characterized in that, The span of the first-type winding conductor is a first span, and the span of the second-type winding conductor is a second span, and the absolute value of the difference between the first span and the second span is less than or equal to 3.

5. The short-pitch winding according to claim 4, characterized in that, The second span is greater than or equal to 7 slots.

6. The short-pitch winding according to claim 5, wherein The first span is 8 slots; and / or, the second span comprises 7 slots and / or 8 slots and / or 9 slots and / or 10 slots and / or 11 slots.

7. The short-pitch winding according to any one of claims 1 to 6, characterized in that, The proportion of the first-type winding conductors in one branch in all the winding conductors in the branch is greater than 50%; the proportion of the second-type winding conductors in one branch in all the winding conductors in the branch is less than 50%.

8. The short-pitch winding according to claim 1, characterized in that, The short-pitch winding is based on a topological structure of 54 slots, 6 poles and n layers, and n is an integer greater than or equal to 2.

9. The short-pitch winding according to claim 8, wherein, n is 6.

10. The short-pitch winding according to claim 9, wherein The three-phase winding is arranged in spatial central symmetry.

11. A stator assembly, characterized in that, Comprising the short-pitch winding according to any one of claims 1 to 10.

12. A motor, characterized in that, Comprising a stator assembly as claimed in claim 11.

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