Motor winding and motor stator

Abstract

The present invention provides a motor winding and a motor stator. The motor winding arranges N first segmented coil units and M second segmented coil units in sequence along the circumferential direction. The first slot part and the second slot part of each first segmented coil unit are distributed in two layers along the radial direction, and the first segmented coil unit is radially arranged at any layer of the motor winding; the third slot part and the fourth slot part of each second segmented coil unit are distributed in the same layer along the radial direction, and the second segmented coil unit is radially arranged at the outermost layer and the innermost layer of the motor winding. The winding structure of the present application adopts a completely symmetrical structure in the magnetic circuit, eliminates the problem of circulating current caused by the asymmetric structure, cancels the busbars between each phase, realizes direct connection between each phase, realizes the branches and neutral points of each phase winding are arranged in any slot and any layer, reduces the complexity of the manufacturing process, reduces the production cost, reduces the material cost, and improves the processing efficiency.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of motors, and in particular to a motor winding and a motor stator. Background Art

[0002] The stator winding includes a plurality of hairpin coils, which are inserted into the slots of the stator core in a certain arrangement to form the winding of the required single-phase motor or multi-phase motor. There are many types of hairpin coils used in the prior art, and the arrangement is complex. A large number of bus bars and busbars are required to connect the branches and neutral points of each phase winding, and the manufacturing process is complex, the production cost is high, and the processing efficiency is low. Summary of the invention

[0003] The present invention provides a motor winding and a motor stator, which adopt a completely symmetrical structure in the magnetic circuit through the winding structure, thereby eliminating the problem of circulating current caused by the asymmetrical structure; the busbars between phases are cancelled, and direct connection between phases is achieved, so that the branches and neutral points of each phase winding are set in any slot and any layer, thereby reducing the complexity of the manufacturing process, reducing the production cost, reducing the material cost, and improving the processing efficiency.

[0004] An embodiment of the present invention provides a motor winding, including:

[0005] Three-phase segmented coil;

[0006] The segmented coil of each phase includes N first segmented coil units and M second segmented coil units, wherein N≥2, M≥4, and N and M are both integers;

[0007] Any of the first segmented coil units comprises: a first slot outer end, a first slot inner portion, a first slot outer turn portion, a second slot inner portion, and a second slot outer end portion connected in sequence, wherein the first slot inner portion and the second slot inner portion are located in different slots; any of the second segmented coil units comprises: a third slot outer end, a third slot inner portion, a second slot outer turn portion, a fourth slot inner portion, and a fourth slot outer end portion connected in sequence, wherein the third slot inner portion and the fourth slot inner portion are located in different slots;

[0008] The slot pitch of the first segmented coil unit is a first pitch, wherein the first pitch is one of the following: full pitch Y, long pitch Z, short pitch X1; the slot pitch of the second segmented coil unit is a second pitch, wherein the second pitch is a short pitch X2; Z>Y>X1=X2;

[0009] N first segmented coil units are arranged in sequence along the circumferential direction, the first slot in-slot portion and the second slot in-slot portion of each first segmented coil unit are distributed in two layers along the radial direction, and the first segmented coil unit is arranged in any layer of the motor winding along the radial direction;

[0010] The M second segmented coil units are sequentially arranged along the circumferential direction, the third slot inner portion and the fourth slot inner portion of each second segmented coil unit are distributed in the same layer along the radial direction, and the second segmented coil units are radially arranged at the outermost layer and the innermost layer of the motor winding;

[0011] The number M of the second segmented coil units is smaller than the number of poles of the coil winding.

[0012] Furthermore, the number of coil layers of the motor winding along the radial direction is an even number greater than or equal to 4.

[0013] Furthermore, the first slot outer end and the second slot outer end of the first segmented coil unit extend in opposite and distant directions along the circumferential direction; the third slot outer end and the fourth slot outer end of the second segmented coil unit extend in the same circumferential direction.

[0014] Further, the first segmented coil unit includes a first hairpin coil and a second hairpin coil; wherein, when the slot pitch of the first segmented coil unit is the full pitch Y, the first slot in-portions of M / 2 second hairpin coils are arranged in a layer of an adjacent second segmented coil unit, and the first slot in-portion of each second hairpin coil is arranged in the same slot as the third slot in-portion or the fourth slot in-portion of the second segmented coil unit, and the second slot in-portion of each second hairpin coil is arranged in a layer spaced apart from the second segmented coil unit;

[0015] The second segmented coil unit includes a third card-isolating coil and a fourth card-isolating coil; the number of the third card-isolating coils is equal to the number of the fourth card-isolating coils;

[0016] The outer ends of the slots of the third hairpin coil and the fourth hairpin coil extend in opposite directions along the circumferential direction, wherein the two outer ends of the slots of the third hairpin coil extend in a clockwise direction along the circumferential direction, and the two outer ends of the slots of the fourth hairpin coil extend in a counterclockwise direction along the circumferential direction; or, the two outer ends of the slots of the third hairpin coil extend in a counterclockwise direction along the circumferential direction, and the two outer ends of the slots of the fourth hairpin coil extend in a clockwise direction along the circumferential direction;

[0017] The third hairpin coil is arranged at the outermost layer of the motor winding, and the third slot portion and the fourth slot portion of the third hairpin coil are distributed in the same layer; the fourth hairpin coil is arranged at the innermost layer of the motor winding, and the third slot portion and the fourth slot portion of the fourth hairpin coil are distributed in the same layer;

[0018] Alternatively, the third hairpin coil is arranged at the innermost layer of the motor winding, and the third slot portion and the fourth slot portion of the third hairpin coil are distributed in the same layer; the fourth hairpin coil is arranged at the outermost layer of the motor winding, and the third slot portion and the fourth slot portion of the fourth hairpin coil are distributed in the same layer.

[0019] Furthermore, the number of the second card issuing units in the first segmented coil unit is: L / 2*M, wherein L is the number of intermediate layers of the motor winding excluding the outermost layer and the innermost layer, L≥2, and L is an even number.

[0020] Further, the number of layers of the motor winding is 8, M is equal to 4; the 4 second segmented coil units include 2 third hairpin coils and 2 fourth hairpin coils; the N first segmented coil units include 12 second hairpin coils;

[0021] Wherein, two of the third hairpin coils are arranged at the outermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the third hairpin coils are both located at the outermost layer of the coil winding; two of the fourth hairpin coils are arranged at the innermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the fourth hairpin coils are both located at the innermost layer of the coil winding;

[0022] Alternatively, the two third hairpin coils are arranged in the innermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the third hairpin coils are both located in the innermost layer of the coil winding; the two fourth hairpin coils are arranged in the outermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the fourth hairpin coils are both located in the outermost layer of the coil winding.

[0023] Further, the number of layers of the motor winding is 8, M is equal to 8; the 8 second segmented coil units include 4 third hairpin coils and 4 fourth hairpin coils; the N first segmented coil units include 24 second hairpin coils;

[0024] Among them, the four third hairpin coils are arranged at the outermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the third hairpin coils are both located at the outermost layer of the coil winding; the four fourth hairpin coils are arranged at the innermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the fourth hairpin coils are both located at the innermost layer of the coil winding;

[0025] Alternatively, the four third hairpin coils are arranged in the innermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the third hairpin coils are both located in the innermost layer of the coil winding; the four fourth hairpin coils are arranged in the outermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the fourth hairpin coils are both located in the outermost layer of the coil winding.

[0026] Further, the number of layers of the motor winding is 6, M is equal to 12; the 12 second segmented coil units include 6 third hairpin coils and 6 fourth hairpin coils; the N first segmented coil units include 12 second hairpin coils;

[0027] Among them, six of the third hairpin coils are arranged at the outermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the third hairpin coils are both located at the outermost layer of the coil winding; six of the fourth hairpin coils are arranged at the innermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the fourth hairpin coils are both located at the innermost layer of the coil winding;

[0028] Alternatively, the six third hairpin coils are arranged in the innermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the third hairpin coils are both located in the innermost layer of the coil winding; the six fourth hairpin coils are arranged in the outermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the fourth hairpin coils are both located in the outermost layer of the coil winding.

[0029] Further, the number of layers of the motor winding is 8, M is equal to 16; the 16 second segmented coil units include 8 third hairpin coils and 8 fourth hairpin coils; the N first segmented coil units include 48 second hairpin coils;

[0030] Among them, the eight third hairpin coils are arranged at the outermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each third hairpin coil are both located at the outermost layer of the coil winding; the eight fourth hairpin coils are arranged at the innermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each fourth hairpin coil are both located at the innermost layer of the coil winding;

[0031] Alternatively, the eight third hairpin coils are arranged in the innermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the third hairpin coils are both located in the innermost layer of the coil winding; the eight fourth hairpin coils are arranged in the outermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the fourth hairpin coils are both located in the outermost layer of the coil winding.

[0032] An embodiment of the present invention further provides a motor stator, comprising: a stator core and a motor winding as described in the above embodiment, wherein the stator core is in a circular ring shape, and the inner side of the circular ring of the stator core has a plurality of teeth, and the plurality of teeth are evenly distributed along the circumference of the stator core; a slot is formed between two adjacent teeth; the stator core divides each slot into the first layer, the second layer, ..., the nth layer along the radial direction of the circular ring and pointing to the axial direction, n≥4, and n is an even number.

[0033] Further, the N first segmented coil units in the motor winding are arranged in sequence along the circumferential direction of the stator core, the first in-slot portion and the second in-slot portion of each of the first segmented coil units are located in the slot, and the first in-slot portion and the second in-slot portion are radially arranged in two adjacent layers of the slot;

[0034] The M second segmented coil units in the motor winding are arranged in sequence along the circumferential direction of the stator core, and the third in-slot portion and the fourth in-slot portion of each second segmented coil unit are located in the slot; and the third in-slot portion and the fourth in-slot portion are both arranged in the first layer of the slot, or the third in-slot portion and the fourth in-slot portion are both arranged in the nth layer of the slot.

[0035] The motor winding in the technical solution of the embodiment of the present invention arranges N first segmented coil units and M second segmented coil units in sequence along the circumferential direction, wherein the slot pitch of the first segmented coil unit can be a long pitch Z, a full pitch Y or a short pitch X1, and the slot pitch of the second segmented coil unit is a short pitch X2, the first slot part and the second slot part of each first segmented coil unit are distributed in two layers along the radial direction, and the first segmented coil unit is radially arranged at any layer of the motor winding; the third slot part and the fourth slot part of each second segmented coil unit are distributed in the same layer along the radial direction, and the second segmented coil unit is radially arranged at the outermost layer and the innermost layer of the motor winding. The winding structure of the present application adopts a completely symmetrical structure in the magnetic circuit, eliminating the problem of circulating current caused by the asymmetric structure; the busbars between each phase are cancelled, and direct connection between each phase is realized, and the branches and neutral points of each phase winding are set in any slot and any layer, which reduces the complexity of the manufacturing process, reduces the production cost, reduces the material cost, and improves the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG. 1( a ) is a schematic diagram of the structure of a one-phase segmented coil of a motor winding provided by an embodiment of the present invention;

[0037] FIG1( b ) is a schematic structural diagram of a one-phase segmented coil of a motor winding provided by an embodiment of the present invention from another perspective;

[0038] FIG1( c ) is a schematic structural diagram of a first segmented coil unit provided by an embodiment of the present invention in which the slot pitch is a long pitch;

[0039] FIG2( a ) is a schematic structural diagram of a first segmented coil unit with a full pitch provided by an embodiment of the present invention;

[0040] FIG2( b ) is a schematic structural diagram of a first segmented coil unit with a long pitch provided by an embodiment of the present invention;

[0041] Figure 3 A schematic structural diagram of a second segmented coil unit provided in an embodiment of the present invention;

[0042] Figure 4 is a schematic structural diagram of a motor stator provided by an embodiment of the present invention;

[0043] FIG5( a) is a schematic diagram of a third hairpin coil provided in an embodiment of the present invention;

[0044] FIG5( b ) is a schematic diagram of a fourth hairpin coil provided in an embodiment of the present invention;

[0045] Figure 6 is a schematic diagram of another motor stator provided by an embodiment of the present invention;

[0046] Figure 7 is a schematic diagram of a motor stator having six layers of motor windings provided by an embodiment of the present invention;

[0047] Figure 8 It is a schematic diagram of another motor stator provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0049] An embodiment of the present invention provides a motor winding. Figure 1(a) is a schematic diagram of the structure of a one-phase segmented coil of a motor winding provided by an embodiment of the present invention, and Figure 1(b) is a schematic diagram of the structure of a one-phase segmented coil of a motor winding provided by an embodiment of the present invention from another perspective. The motor winding may be a stator winding or a rotor winding, and may be arranged on the stator core or the rotor core of the motor. Figure 2(a) is a schematic diagram of the structure of a first segmented coil unit provided by an embodiment of the present invention, in which the pitch is a full pitch. Figure 2(b) is a schematic diagram of the structure of a first segmented coil unit provided by an embodiment of the present invention, in which the pitch is a long pitch. Figure 3 A schematic structural diagram of a second segmented coil unit provided in an embodiment of the present invention. Figure 4 It is a structural schematic diagram of a motor stator provided in an embodiment of the present invention.

[0050] As shown in FIG1 , each phase segmented coil 10 in the three-phase segmented coil of the motor winding includes N first segmented coil units 30 and M second segmented coil units 40 (including 40-1 and 40-2 in the figure), see FIG1(a) and FIG1(b), the N first segmented coil units 30 are distributed in each layer of the coil winding, and the M second segmented coil units 40 are distributed in the outermost and innermost layers of the coil winding, wherein N≥2, M≥4, and N and M are both integers.

[0051] like Figure 2(a) and 2(b) As shown, any first segmented coil unit 30 includes: a first slot outer end 303-1, a first slot inner portion 301-1, a first slot outer turning portion 302, a second slot inner portion 301-2, and a second slot outer end 303-2 connected in sequence, wherein the first slot inner portion 301-1 and the second slot inner portion 301-2 are located in different slots. Figure 3As shown, any second segmented coil unit 40 includes: a third slot outer end 403-1, a third slot inner part 401-1, a second slot outer turning part 402, a fourth slot inner part 401-2 and a fourth slot outer end 403-2 connected in sequence, and the third slot inner part 401-1 and the fourth slot inner part 401-2 are located in different slots; wherein the slot pitch of the first segmented coil unit 30 is one of the following: full pitch Y, long pitch Z, short pitch X1, and the slot pitch of the second segmented coil unit 40 is short pitch X2, long pitch Z>full pitch Y>short pitch X1=short pitch X2, and usually, the long pitch in the slot pitch is 7, the full pitch is 6, and the short pitches X1 and X2 are both 5.

[0052] It should be noted that when the slot pitch of the first segmented coil unit 30 is a full pitch Y, for the motor winding, the hairpin coils arranged in the same slot of the motor stator are hairpin coils of the same phase, for example, all are U phase or all are V phase, and when the slot pitch of the first segmented coil unit 30 is a long pitch Z or a short pitch X1, the hairpin coils arranged in the same slot of the motor stator are hairpin coils of different phases. Figure 1(c) is a schematic diagram of the structure in which the slot pitch of the first segmented coil unit provided in an embodiment of the present invention is a long pitch. By way of example, the following embodiments of the present application are all described as when the slot pitch of the first segmented coil unit 30 is a full pitch Y.

[0053] like Figure 2(a) and 2(b) As shown, no matter the slot pitch of the first segmented coil unit 30 is the long pitch Z or the full pitch Y, the first slot outer end 303-1 and the second slot outer end 303-2 extend in opposite directions and are far away from each other along the circumferential direction. Obviously, when the slot pitch of the first segmented coil unit 30 is the short pitch X1, the first slot outer end 303-1 and the second slot outer end 303-2 extend in opposite directions and are far away from each other along the circumferential direction.

[0054] like Figure 3 As shown, the third slot outer end portion 403 - 1 and the fourth slot outer end portion 403 - 1 of the second segment coil unit 40 extend in the same circumferential direction.

[0055] In the embodiment of the present invention, Figure 2(a) , 2(b) and Figure 3 As shown, a single card-isolating unit constituting the motor winding (i.e., the first segmented coil unit 30 and the second segmented coil unit 40) is arranged in the form of a full pitch and a short pitch, or a long pitch and a short pitch, or both are short pitches, and the short-pitch second segmented coil unit 40 is arranged in the same layer, and some are arranged in the outermost layer and the innermost layer of the segmented coil 10, and the remaining card-isolating units of the segmented coil 10 all adopt the first segmented coil unit 30 placed in two layers.

[0056] Combining Figure 1(a) and Figure 4 As shown, N first segmented coil units 30 are arranged in sequence along the circumferential direction, the first slot part 301-1 and the second slot part 301-2 of each first segmented coil unit 30 are distributed in two layers along the radial direction, and the first segmented coil unit 30 is radially arranged in any layer of the motor winding.

[0057] The M second segmented coil units 40 are arranged in sequence along the circumferential direction, the third slot part 401-1 and the fourth slot part 401-2 of each second segmented coil unit 40 are distributed in the same layer along the radial direction, and the second segmented coil units 40 are radially arranged at the outermost and innermost layers of the motor winding.

[0058] Referring to Figures 1(a) and 1(b), the first segmented coil unit 30 includes a first hairpin coil 30-1 and a second hairpin coil 30-2, wherein, referring to Figures 5(a) and 5(b), when the slot pitch of the first segmented coil unit 30 is the full pitch Y, the first slot portions 301-1 of the M / 2 second hairpin coils 30-2 are arranged in a layer of an adjacent second segmented coil unit 40, and the first slot portion 303-1 of each second hairpin coil 30-2 is arranged in the same slot as the third slot portion 401-1 or the fourth slot portion 401-2 of the second segmented coil unit 40, and the second slot portion 301-2 of each second hairpin coil 30-2 is arranged in a layer separated by the second segmented coil unit 40.

[0059] Specifically, since the second segmented coil units 40 are arranged in the same layer, when M / 2 of the M second segmented coil units 40 are arranged in the outermost layer of the coil winding, and the other M / 2 second segmented coil units 40 are arranged in the innermost layer of the coil winding, there will be 2M slots in the two layers adjacent to the outermost layer and the innermost layer where the second segmented coil units 40 are placed in an empty state, so 2M second hairpin coils 30-2 are needed to fill the vacancies, that is, the second hairpin coils 30-2 are The first in-slot portion 301-1 of the coil 30-2 is arranged in a layer of the adjacent second segmented coil unit 40, and the first in-slot portion 303-1 of each second hairpin coil 30-2 is arranged in the same slot as the third in-slot portion 401-1 or the fourth in-slot portion 401-2 of the second segmented coil unit 40; since the second hairpin unit 30-2 adopts a cross-layer arrangement, the second in-slot portion 301-2 of the second hairpin coil 30-2 is arranged in a layer separated by the second segmented coil unit 40.

[0060] The second segmented coil unit 40 includes a third hairpin coil 40-1 and a fourth hairpin coil 40-2; the number of the third hairpin coils 40-1 is equal to the number of the fourth hairpin coils 40-2; as shown in Figure 1(a), the third hairpin coils 40-1 are arranged at the outermost layer of the motor winding, and the third slot part 401-1 and the fourth slot part 401-2 of the third hairpin coil 40-1 are distributed in the same layer; the fourth hairpin coil 40-2 is arranged at the innermost layer of the motor winding, and the third slot part 401-1 and the fourth slot part 401-2 of the fourth hairpin coil 40-2 are distributed in the same layer. Alternatively, the third hairpin coil 40-1 is arranged at the innermost layer of the motor winding, and the third slot portion 401-1 and the fourth slot portion 401-2 of the third hairpin coil 40-1 are arranged in the same layer; the fourth hairpin coil 40-2 is arranged at the outermost layer of the motor winding, and the third slot portion 401-1 and the fourth slot portion 401-2 of the fourth hairpin coil 40-2 are arranged in the same layer. That is, the positions of the third hairpin coil 40-1 and the fourth hairpin coil 40-2 can be interchanged according to actual needs.

[0061] The outer slot ends of the third hairpin coil 40-1 and the fourth hairpin coil 40-2 extend in opposite directions along the circumferential direction, wherein the two outer slot ends 403-1 and 403-2 of the third hairpin coil 40-1 extend in a clockwise direction, and the two outer slot ends 403-1 and 403-2 of the fourth hairpin coil 40-2 extend in a counterclockwise direction. Alternatively, the two outer slot ends 403-1 and 403-2 of the third hairpin coil 40-1 extend in a counterclockwise direction, and the two outer slot ends 403-1 and 403-2 of the fourth hairpin coil 40-2 extend in a clockwise direction. That is, the extension directions of the outer slot ends of the third hairpin coil 40-1 and the fourth hairpin coil 40-2 can be interchanged according to actual needs.

[0062] Optionally, the number of the second hairpin coils 30 - 2 in the first segmented coil unit 30 is: L / 2*M, wherein L is the number of intermediate layers of the motor winding excluding the outermost layer and the innermost layer, L≥2, and L is an even number.

[0063] Specifically, the number of layers of the motor winding is an even number greater than or equal to 4, and the number of second hairpin coils 30-2 increases by M for every 2 layers of the middle layers of the motor winding. The number of second hairpin coils 30-2 in the first segmented coil unit 30 is specifically introduced below with a specific embodiment.

[0064] Exemplarily, when the number of layers of the motor winding is 8, L is 6, then when the number M of the second segmented coil units 40 is 4, the number of the second card-isolating units 30-2 is 12; specifically, when the number of the second segmented coil units 40 is 4, including 2 third card-isolating coils 40-1 arranged on the 1st layer and 2 fourth card-isolating coils 40-2 arranged on the 8th layer, since the second segmented coil units 40 are all arranged on the same layer, 4 (M) slots appear in the 2nd layer in an empty state, and 4 (M) slots also appear in the 7th layer. The slot is in an empty state, so 8 (2M) second card issuing coils 30-2 are needed to fill the vacancies, that is, 4 second card issuing coils 30-2 are set from the 2nd layer to the 3rd layer, and 4 second card issuing coils 30-2 are set from the 7th layer to the 6th layer; at the same time, 4 second card issuing coils 30-2 are also set from the 4th layer to the 5th layer, and the 4 second card issuing coils 30-2 set from the 4th layer to the 5th layer are in the same slot as the 4 second card issuing coils 30-2 set from the 2nd layer to the 3rd layer and from the 7th layer to the 6th layer.

[0065] FIG. 5( a ) is a schematic diagram of a third hairpin coil provided in an embodiment of the present invention, and FIG. 5( b ) is a schematic diagram of a fourth hairpin coil provided in an embodiment of the present invention.

[0066] Exemplarily, referring to Figures 5(a) and 5(b), the slot pitch X is set to 5, and the slot pitch Y is set to 6. It can be seen that the second segmented coil unit 40 includes a third card-hairing coil 40-1 and a fourth card-hairing coil 40-2, wherein the first card-hairing unit 40-1 is arranged in the outermost layer of the coil winding, and its slot pitch is 5, which is a short pitch, and the two slot inner parts of the first card-hairing unit 40-1 are placed in the two slots of the outermost layer of the coil winding in the same layer; the second card-hairing unit 40-2 is arranged in the innermost layer of the coil winding, and its slot pitch is 5, which is a short pitch, and the second card-hairing unit 40-2 is placed in the two slots of the innermost layer of the coil winding in the same layer; the remaining card-hairing units are all first segmented coil units 30, whose slot pitch is 6, which is a long pitch relative to the second segmented coil unit 40, and the two slot inner parts of the first segmented coil unit 30 are placed in two adjacent layers of the coil winding.

[0067] Optionally, the number M of the second segmented coil units 40 is less than the number of poles of the coil winding. For example, when the number of poles of the coil winding is 8, the number M of the second segmented coil units 40 can be set to 4.

[0068] Optionally, the number of coil layers of the motor winding along the radial direction is an even number greater than or equal to 4. The number of coil layers of the motor winding along the radial direction of the stator is generally an even number greater than or equal to 4, such as 4 layers, 6 layers, 8 layers, etc. In this application, an 8-layer motor winding is used to introduce the specific implementation of the application.

[0069] See Figure 1 and Figure 4 , the number of layers of the motor winding is 8, the number M of the second segmented coil units 40 is equal to 4; the 4 second segmented coil units 40 include 2 third hairpin coils 40-1 and 2 fourth hairpin coils 40-2; the N first segmented coil units 30 include 12 second hairpin coils 30-2. Among them, the 2 third hairpin coils 40-1 are arranged at the outermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each third hairpin coil 40-1 are both located at the outermost layer of the coil winding; the 2 fourth hairpin coils 40-2 are arranged at the innermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each fourth hairpin coil 40-2 are both located at the innermost layer of the coil winding.

[0070] For example, from Figure 4 As can be seen from the motor stator schematic diagram in FIG. 1 , when M is equal to 4, each phase of the three-phase segmented coil has two third hairpin coils 40-1 in the outermost layer, and correspondingly, there are two fourth hairpin coils 40-2 in the innermost layer (due to the viewing angle Figure 4 As shown in FIG1 , for each phase segmented coil 10 of the coil winding, the outermost layer of the coil winding further includes 6 first segmented coil units 30, and the 6 first segmented coil units 30 are first hairpin coils 30-1, the first slot in-slot portion 301-1 of the first segmented coil unit 30 is located at the outermost layer of the coil winding, and the second slot in-slot portion 301-2 of the first segmented coil unit 30 is located at a layer adjacent to the outermost layer of the coil winding.

[0071] The innermost layer of the coil winding also includes 6 first segmented coil units 30, and these 6 first segmented coil units 30 are also first hairpin coils 30-1. The first slot part 301-1 of the first segmented coil unit 30 is located in the innermost layer of the coil winding, and the second slot part 301-2 of the first segmented coil unit 30 is located in a layer adjacent to the innermost layer of the coil winding.

[0072] Obviously, the two third hairpin coils 40-1 can also be arranged at the innermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each third hairpin coil 40-1 are both located at the innermost layer of the coil winding; the two fourth hairpin coils 40-2 are arranged at the outermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each fourth hairpin coil 40-2 are both located at the outermost layer of the coil winding. No further details are given here.

[0073] Figure 4 It can be seen from the motor stator in FIG. 1 that the outermost layer of the three-phase segmented coil has a total of 6 second segmented coil units 40, and correspondingly, the innermost layer also has 6 second segmented coil units 40 ( Figure 4 The remaining coil units are all first segmented coil units 30 ( Figure 4 6 first segmented coil units 30 are marked as an example.

[0074] Figure 6 It is a schematic diagram of another motor stator provided in an embodiment of the present invention.

[0075] See also Figure 6 , the three-phase segmented coil 100 can be limited to 2 poles, and the number of slots per pole and per phase is 2 (that is, every two adjacent slots occupy the same phase). Figure 6 As shown, the three-phase segmented coil 100 is a winding with two parallel branches, and its phase lead wires can be 11, 12, 13 (i.e., corresponding to the U phase, V phase, and W phase of the stator), and the neutral points can be 14, 15, and 16; the phase lead wires of the three-phase segmented coil 100 can also be 14, 15, and 16 (i.e., corresponding to the U phase, V phase, and W phase of the stator), and the neutral points are 11, 12, and 13. Therefore, the lead wires of the three-phase segmented coil of the present application can be in any slot and any layer, and the lead wires 11 and 14, 12 and 15, 13 and 16 of each phase are respectively arranged in two adjacent layers in the same radial direction extending along the central axis.

[0076] Optionally, the number M of the second segmented coil units 40 is equal to 8; the 8 second segmented coil units 40 include 4 third hairpin coils 40 - 1 and 4 fourth hairpin coils 40 - 2; the N first segmented coil units 30 include 24 second hairpin coils 30 - 2.

[0077] Among them, the four third hairpin coils 40-1 are arranged at the outermost layer of the coil winding, and the third slot inner part 401-1 and the fourth slot inner part 401-2 of each third hairpin coil 40-1 are both located at the outermost layer of the coil winding; the four fourth hairpin coils 40-2 are arranged at the innermost layer of the coil winding, and the third slot inner part 401-1 and the fourth slot inner part 401-2 of each fourth hairpin coil 40-2 are both located at the innermost layer of the coil winding. For example, from Figure 8 It can be seen from the motor stator schematic diagram in that when M is equal to 8, each phase of the three-phase segmented coil has four third hairpin coils 40-1 in the outermost layer, and correspondingly, has four fourth hairpin coils 40-2 in the innermost layer.

[0078] The outermost layer of the coil winding also includes four first segmented coil units 30, which are first hairpin coils 30-1. The first slot part 301-1 of the first hairpin coil 30-1 is located at the outermost layer of the coil winding, and the second slot part 301-2 of the first hairpin coil 30-1 is located in a layer adjacent to the outermost layer of the coil winding.

[0079] The innermost layer of the coil winding also includes four first segmented coil units 30, which are first hairpin coils 30-1. The first slot portion 301-1 of the first hairpin coil 30-1 is located in the innermost layer of the coil winding, and the second slot portion 301-2 of the first hairpin coil 30-1 is located in a layer adjacent to the innermost layer of the coil winding.

[0080] Alternatively, the four third hairpin coils 40-1 are arranged at the innermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each third hairpin coil 40-1 are both located at the innermost layer of the coil winding; the four fourth hairpin coils 40-2 are arranged at the outermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each fourth hairpin coil 40-2 are both located at the outermost layer of the coil winding. No further details are given here.

[0081] Figure 7 It is a schematic diagram of a motor stator with 6 layers of motor windings provided in an embodiment of the present invention.

[0082] Alternatively, if Figure 7 As shown, the number of layers of the motor winding is 6, and the number M of the second segmented coil units 40 is equal to 12; the 12 second segmented coil units 40 include 6 third hairpin coils 40-1 and 6 fourth hairpin coils 40-2; the N first segmented coil units 30 include 12 second hairpin coils 30-2.

[0083] Among them, the six third hairpin coils 40-1 are arranged in the outermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each third hairpin coil 40-1 are both located in the outermost layer of the coil winding; the six fourth hairpin coils 40-2 are arranged in the innermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each fourth hairpin coil 40-2 are both located in the innermost layer of the coil winding.

[0084] Alternatively, the six third hairpin coils 40-1 are arranged at the innermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each third hairpin coil 40-1 are both located at the innermost layer of the coil winding; the six fourth hairpin coils 40-2 are arranged at the outermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each fourth hairpin coil 40-2 are both located at the outermost layer of the coil winding. No further details are given here.

[0085] See also Figure 7 The U-phase outlet terminal of the three-phase segmented coil 100 can be 11, 12, 13, and the U-phase inlet terminal can be 21, 22, 23; the U-phase outlet terminal of the three-phase segmented coil 100 can also be 21, 22, 23, and the U-phase inlet terminal can be 11, 12, 13.

[0086] Optionally, the number of layers of the motor winding is 8, the number M of the second segmented coil units 40 is equal to 16; the 16 second segmented coil units 40 include 8 third hairpin coils 40-1 and 8 fourth hairpin coils 40-2; the N first segmented coil units 30 include 48 second hairpin coils 30-2.

[0087] Among them, the eight third hairpin coils 40-1 are arranged in the outermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each third hairpin coil 40-1 are both located in the outermost layer of the coil winding; the eight fourth hairpin coils 40-2 are arranged in the innermost layer of the coil winding, and the third slot part 401-1 and the fourth slot part 401-2 of each fourth hairpin coil 40-2 are both located in the innermost layer of the coil winding.

[0088] Alternatively, the eight third hairpin coils 40-1 are arranged at the innermost layer of the coil winding, and the third slot inner portion 401-1 and the fourth slot inner portion 401-2 of each third hairpin coil 40-1 are both located at the innermost layer of the coil winding; the eight fourth hairpin coils 40-2 are arranged at the outermost layer of the coil winding, and the third slot inner portion 401-1 and the fourth slot inner portion 401-2 of each fourth hairpin coil 40-2 are both located at the outermost layer of the coil winding. No further details are given here.

[0089] Figure 8 It is a schematic diagram of another motor stator provided in an embodiment of the present invention.

[0090] See also Figure 8 , Figure 8 The three-phase segmented coil 100 is a winding of four parallel branches, wherein the phase lead wires of the three-phase segmented coil 100 can be 21, 22, 23, 24, 25, 26 (i.e., corresponding to the U phase, V phase, W phase, U phase, V phase, W phase of the stator), and the neutral point can be 27, 28, 29, 30, 31, 32; the phase lead wires of the three-phase segmented coil 100 can also be 27, 28, 29, 30, 3 1, 32 (i.e., corresponding to the U phase, V phase, W phase, U phase, V phase, W phase of the stator), the neutral point is 21, 22, 23, 24, 25, 26; therefore, the lead wires of the three-phase segmented coil of the present application can be in any slot and any layer, and the lead wires 21 and 27, 22 and 28, 23 and 29, 24 and 30, 25 and 31, 26 and 32 of each phase are arranged in two adjacent layers in the same radial direction extending along the center axis.

[0091] In an embodiment of the present invention, Figure 6 The windings of the two parallel branches in Figure 8The outermost and innermost layers of the windings of the four parallel branches in are both provided with corresponding short pitch coil units (i.e., the second segmented coil units mentioned above), and the number of short pitch coil units in the outermost and innermost layers is the same as the number of parallel branches of the winding, i.e., the number of parallel branches of the motor winding is equal to M / 2. For example, Figure 6 The outermost and innermost layers of the windings of the two parallel branches are each provided with two second segmented coil units 40, Figure 8 The outermost layer and the innermost layer of the winding of the four parallel branches are each provided with four second segmented coil units 40, and only the first segmented coil units 30 are provided in the other layers of the coil winding except the outermost layer and the innermost layer.

[0092] It should be noted that Figure 6 and Figure 8 The number of slots of the motor stator shown in the figure is 48, and the outermost and innermost parts of the coil winding are provided with a second segmented coil unit 40 (ie, Figure 6 There are 6 settings in Figure 8 12 are set in the figure, and the rest are first segmented coil units 30. In actual use, coil windings with eight parallel branches or other numbers of parallel branches can also be set as needed. Taking eight parallel branches as an example, at this time, the outermost layer and the innermost layer of each phase segmented coil of the coil winding are respectively set with 8 first segmented coil units 40. According to the needs, the number of slots of the motor stator is no longer 48, but should be set to 96.

[0093] The embodiment of the present invention provides a motor stator. Figure 6 , including: a stator core 20 and a motor winding provided by any embodiment of the present invention, the stator core 20 is in a circular ring shape, and the inner side of the circular ring of the stator core has a plurality of teeth, and the plurality of teeth are evenly distributed along the circumference of the stator core 20; a slot is formed between two adjacent teeth; the stator core 20 divides each slot into the first layer, the second layer, ..., the nth layer along the radial direction of the circular ring and pointing to the axial direction, n≥4, and n is an even number.

[0094] The N first segmented coil units 30 in the motor winding are arranged in sequence along the circumferential direction of the stator core, and the first in-slot portion 301-1 and the second in-slot portion 301-2 of each first segmented coil unit 30 are located in the slot, and the first in-slot portion 301-1 and the second in-slot portion 301-2 are arranged in two adjacent layers of the slot in the radial direction;

[0095] The M second segmented coil units 40 in the motor winding are arranged in sequence along the circumferential direction of the stator core, and the third slot portion 401-1 and the fourth slot portion 401-2 of each second segmented coil unit 40 are located in the slot; and the third slot portion 401-1 and the fourth slot portion 401-2 are both arranged in the first layer of the slot, or the third slot portion 401-1 and the fourth slot portion 401-2 are both arranged in the nth layer of the slot. Figure 6 For example, Figure 6 The slots of the motor stator 20 are divided into 8 layers along the radial direction of the ring and pointing to the axial direction. The third slot part 401-1 and the fourth slot part 401-2 of the third hairpin coil 40-1 in the second segmented coil unit 40 are both arranged in the first layer of the slot, and the third slot part 401-1 and the fourth slot part 401-2 of the fourth hairpin coil 40-2 in the second segmented coil unit 40 are both arranged in the eighth layer of the slot.

[0096] The motor can be a permanent magnet motor or an asynchronous AC motor. The motor stator provided by the embodiment of the present invention includes the motor winding in the above embodiment, so the motor stator provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be repeated here.

[0097] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0098] Finally, it should be noted that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A motor winding, characterized in that: include: Three-phase segmented coil; The segmented coil of each phase includes N first segmented coil units and M second segmented coil units, wherein N≥2, M≥4, and N and M are both integers; Any of the first segmented coil units comprises: a first slot outer end portion, a first slot inner portion, a first slot outer turning portion, a second slot inner portion, and a second slot outer end portion connected in sequence, wherein the first slot inner portion and the second slot inner portion are located in different slots; Any of the second segmented coil units comprises: a third slot outer end portion, a third slot inner portion, a second slot outer turning portion, a fourth slot inner portion and a fourth slot outer end portion connected in sequence, wherein the third slot inner portion and the fourth slot inner portion are located in different slots; The slot pitch of the first segmented coil unit is a first pitch, wherein the first pitch is one of the following: full pitch Y, long pitch Z, short pitch X1; the slot pitch of the second segmented coil unit is a second pitch, wherein the second pitch is short pitch X2; Z>Y>X1=X2; N first segmented coil units are arranged in sequence along the circumferential direction, the first slot in-slot portion and the second slot in-slot portion of each first segmented coil unit are distributed in two layers along the radial direction, and the first segmented coil unit is arranged in any layer of the motor winding along the radial direction; The M second segmented coil units are sequentially arranged along the circumferential direction, the third slot inner portion and the fourth slot inner portion of each second segmented coil unit are distributed in the same layer along the radial direction, and the second segmented coil units are radially arranged at the outermost layer and the innermost layer of the motor winding; The number M of the second segmented coil units is less than the number of poles of the coil winding; The number of coil layers of the motor winding in the radial direction is an even number greater than or equal to 4; The first segmented coil unit includes a first hairpin coil and a second hairpin coil; wherein, when the slot pitch of the first segmented coil unit is the full pitch Y, the first slot in-portions of M / 2 second hairpin coils are arranged in a layer of an adjacent second segmented coil unit, and the first slot in-portion of each second hairpin coil is arranged in the same slot as the third slot in-portion or the fourth slot in-portion of the second segmented coil unit, and the second slot in-portion of each second hairpin coil is arranged in a layer spaced apart from the second segmented coil unit; The second segmented coil unit includes a third card-isolating coil and a fourth card-isolating coil; the number of the third card-isolating coils is equal to the number of the fourth card-isolating coils; The outer ends of the slots of the third hairpin coil and the fourth hairpin coil extend in opposite directions along the circumferential direction, wherein the two outer ends of the slots of the third hairpin coil extend in a clockwise direction along the circumferential direction, and the two outer ends of the slots of the fourth hairpin coil extend in a counterclockwise direction along the circumferential direction; or, the two outer ends of the slots of the third hairpin coil extend in a counterclockwise direction along the circumferential direction, and the two outer ends of the slots of the fourth hairpin coil extend in a clockwise direction along the circumferential direction; The third hairpin coil is arranged at the outermost layer of the motor winding, and the third slot portion and the fourth slot portion of the third hairpin coil are distributed in the same layer; the fourth hairpin coil is arranged at the innermost layer of the motor winding, and the third slot portion and the fourth slot portion of the fourth hairpin coil are distributed in the same layer; Alternatively, the third hairpin coil is arranged at the innermost layer of the motor winding, and the third slot portion and the fourth slot portion of the third hairpin coil are distributed in the same layer; the fourth hairpin coil is arranged at the outermost layer of the motor winding, and the third slot portion and the fourth slot portion of the fourth hairpin coil are distributed in the same layer.

2. The motor winding according to claim 1, characterized in that: The first slot outer end portion and the second slot outer end portion of the first segmented coil unit extend in opposite directions and are far away from each other along the circumferential direction; The third slot outer end portion and the fourth slot outer end portion of the second segment coil unit extend in the same circumferential direction.

3. The motor winding according to claim 1, characterized in that: The number of the second hairpin coils in the first segmented coil unit is: L / 2*M, wherein L is the number of intermediate layers of the motor winding excluding the outermost layer and the innermost layer, L≥2, and L is an even number.

4. The motor winding according to claim 3, characterized in that: The number of layers of the motor winding is 8, M is equal to 4; the 4 second segmented coil units include 2 third hairpin coils and 2 fourth hairpin coils; the N first segmented coil units include 12 second hairpin coils; Wherein, two of the third hairpin coils are arranged at the outermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the third hairpin coils are both located at the outermost layer of the coil winding; two of the fourth hairpin coils are arranged at the innermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the fourth hairpin coils are both located at the innermost layer of the coil winding; Alternatively, the two third hairpin coils are arranged in the innermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the third hairpin coils are both located in the innermost layer of the coil winding; the two fourth hairpin coils are arranged in the outermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the fourth hairpin coils are both located in the outermost layer of the coil winding.

5. The motor winding according to claim 3, characterized in that: The number of layers of the motor winding is 8, M is equal to 8; the 8 second segmented coil units include 4 third hairpin coils and 4 fourth hairpin coils; the N first segmented coil units include 24 second hairpin coils; Among them, the four third hairpin coils are arranged at the outermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the third hairpin coils are both located at the outermost layer of the coil winding; the four fourth hairpin coils are arranged at the innermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the fourth hairpin coils are both located at the innermost layer of the coil winding; Alternatively, the four third hairpin coils are arranged in the innermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the third hairpin coils are both located in the innermost layer of the coil winding; the four fourth hairpin coils are arranged in the outermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the fourth hairpin coils are both located in the outermost layer of the coil winding.

6. The motor winding according to claim 3, characterized in that: The number of layers of the motor winding is 6, and M is equal to 12; the 12 second segmented coil units include 6 third hairpin coils and 6 fourth hairpin coils; the N first segmented coil units include 12 second hairpin coils; Among them, six of the third hairpin coils are arranged at the outermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the third hairpin coils are both located at the outermost layer of the coil winding; six of the fourth hairpin coils are arranged at the innermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each of the fourth hairpin coils are both located at the innermost layer of the coil winding; Alternatively, the six third hairpin coils are arranged in the innermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the third hairpin coils are both located in the innermost layer of the coil winding; the six fourth hairpin coils are arranged in the outermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the fourth hairpin coils are both located in the outermost layer of the coil winding.

7. The motor winding according to claim 3, characterized in that: The number of layers of the motor winding is 8, and M is equal to 16; the 16 second segmented coil units include 8 third hairpin coils and 8 fourth hairpin coils; the N first segmented coil units include 48 second hairpin coils; Among them, the eight third hairpin coils are arranged at the outermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each third hairpin coil are both located at the outermost layer of the coil winding; the eight fourth hairpin coils are arranged at the innermost layer of the coil winding, and the third slot inner part and the fourth slot inner part of each fourth hairpin coil are both located at the innermost layer of the coil winding; Alternatively, the eight third hairpin coils are arranged in the innermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the third hairpin coils are both located in the innermost layer of the coil winding; the eight fourth hairpin coils are arranged in the outermost layer of the coil winding, and the third slot portion and the fourth slot portion of each of the fourth hairpin coils are both located in the outermost layer of the coil winding.

8. A motor stator, characterized in that: include: A stator core and a motor winding as described in any one of claims 1 to 7, wherein the stator core is in a circular ring shape, the inner side of the circular ring of the stator core has a plurality of teeth, the plurality of teeth are evenly distributed along the circumference of the stator core; a slot is formed between two adjacent teeth; the stator core divides each slot into the first layer, the second layer, ..., the nth layer along the radial direction of the circular ring and pointing to the axial direction, n ≥ 4, and n is an even number.

9. The motor stator according to claim 8, characterized in that: The N first segmented coil units in the motor winding are arranged in sequence along the circumferential direction of the stator core, the first in-slot portion and the second in-slot portion of each first segmented coil unit are located in the slot, and the first in-slot portion and the second in-slot portion are arranged in two adjacent layers of the slot in the radial direction; The M second segmented coil units in the motor winding are arranged in sequence along the circumferential direction of the stator core, and the third in-slot portion and the fourth in-slot portion of each second segmented coil unit are located in the slot; and the third in-slot portion and the fourth in-slot portion are both arranged in the first layer of the slot, or the third in-slot portion and the fourth in-slot portion are both arranged in the nth layer of the slot.

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