A motor winding and stator assembly

Abstract

The application provides a motor winding and a stator assembly. The motor winding comprises: phase windings, each phase winding comprising a plurality of branches, each branch comprising: a plurality of lap winding coil groups, each lap winding coil group comprising a plurality of U-shaped coils, wherein the span of each U-shaped coil is y, and y represents the pole pitch of the motor; and a wave winding coil, the span of which is y+1 or y-1, and in a single branch, the spans of the wave winding coils are alternately arranged as y+1 and y-1; wherein the wave winding coils are connected in series between adjacent lap winding coil groups, one end of each wave winding coil is connected to the innermost U-shaped coil of one lap winding coil group, and the other end of each wave winding coil is connected to the outermost U-shaped coil of the adjacent lap winding coil group. The application cancels the overbridge wire, simplifies the wiring mode of the winding, and reduces the types of coils and the types of molds, thereby simplifying the process and improving the processing efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, in particular to an electric machine winding and a stator assembly. BACKGROUND

[0002] In the field of new energy vehicles, the adoption of flat wire winding to drive electric machines has numerous advantages such as light weight and high power. In the prior art, the coils of the chain winding of an alternating current electric machine are continuously wound by a winding die, and the coils are connected by a bridge wire. However, this is only suitable for ordinary round copper wire winding, and the number of layers of the winding is limited to one layer, and cannot be applied to multi-layer flat wire winding. In addition, in Chinese patents CN202010580783.0, CN201810850677.2 and CN201811141645.1, when flat wire coils are wound for an alternating current electric machine, the twisted slot pitches of the welding ends of the flat wire coils are inconsistent, resulting in a complex manufacturing process and low processing efficiency. Moreover, due to the presence of the bridge wire, the line type is complex, and the required die for manufacturing the flat wire coil is increased, which increases the welding points and results in high cost. SUMMARY

[0003] The present application proposes a chain flat wire winding and a stator assembly, which can solve the problem of inconsistent twisted slot pitches of the welding ends of the existing flat wire coils, and the following technical solutions can be proposed.

[0004] The present application can propose an electric machine winding, comprising:

[0005] A multi-phase winding, each phase of the winding comprising a plurality of branches, the branches comprising:

[0006] A plurality of lap winding coil groups, the lap winding coil groups comprising a plurality of U-shaped coils, wherein the span of the U-shaped coils is y, and y represents the pole pitch of the electric machine; and

[0007] A wave winding coil, the span of which is y+1 or y-1, and within a single branch, the spans of the wave winding coils are alternately arranged as y+1 and y-1.

[0008] Wherein, the wave winding coil is connected in series between adjacent lap winding coil groups, one end of the wave winding coil is connected to the innermost U-shaped coil of a lap winding coil group, and the other end of the wave winding coil is connected to the outermost U-shaped coil of an adjacent lap winding coil group.

[0009] In an embodiment of the present application, within a single lap winding coil group, the plurality of U-shaped coils are connected in series.

[0010] In an embodiment of the present application, the U-shaped coil comprises a welding portion, the span of which is y / 2, and the U-shaped coils are connected by the welding portion.

[0011] In an embodiment of the present application, the welding portions of the U-shaped coils are close to each other and extend in opposite directions.

[0012] In an embodiment of the present application, the branch circuits are arranged in parallel between each other, and the number of the branch circuits is a positive integer greater than or equal to 4.

[0013] The present application can also provide a stator assembly, comprising:

[0014] A core is provided with a plurality of stator slots, which are distributed along the circumference of the core;

[0015] A multi-phase winding is wound on the core, and each phase of the winding comprises a plurality of branch circuits, which comprise:

[0016] A plurality of lap coil groups, each of which comprises a plurality of U-shaped coils, wherein the span of the U-shaped coils is y, and y represents the pole pitch of the motor; and

[0017] A wave winding with a span of y+1 or y-1, and in a single branch circuit, the span of the wave winding is alternately arranged as y+1 and y-1.

[0018] Wherein, the wave winding is connected in series between adjacent lap coil groups, one end of the wave winding is connected to the innermost U-shaped coil of one lap coil group, and the other end of the wave winding is connected to the outermost U-shaped coil of the adjacent lap coil group.

[0019] In an embodiment of the present application, the stator slots of the core are provided with N slot layers, and N is an even number.

[0020] In an embodiment of the present application, in a single lap coil group, the U-shaped coils are located between the 2nd slot layer and the N-1th slot layer.

[0021] In an embodiment of the present application, the U-shaped coil comprises:

[0022] Two straight line segments; and

[0023] A connecting portion connected between the two straight line segments.

[0024] Wherein, in the radial direction of the motor core, the two straight line segments in a single U-shaped coil are separated by one slot layer.

[0025] In an embodiment of the present application, one end of the wave winding is located in the 1st slot layer of the core, and the other end of the wave winding is located in the Nth slot layer of the core.

[0026] The motor winding and the stator assembly reduce the complexity of the manufacturing process, reduce the production cost, cancel the bridge line, simplify the wiring mode of the winding, and the types of the coil are less, so that the types of the mold are less, thereby simplifying the process and improving the processing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structure schematic view of the stator assembly of the present application.

[0028] Figure 2 It is a wiring diagram of a phase winding in the stator assembly of the present application.

[0029] Figure 3 It is an expansion diagram of two branches of a phase winding in the stator assembly of the present application.

[0030] Figure 4 It is an expansion diagram of another two branches of a phase winding in the stator assembly of the present application.

[0031] Figure 5 It is a structure schematic view of the stator winding in the stator assembly of the present application.

[0032] Figure 6 It is an enlarged schematic view of A in the present application. Figure 5

[0033] Figure 7 It is a structure schematic view of the wave winding coil group in the stator assembly of the present application.

[0034] Figure 8 It is an enlarged schematic view of B in the present application. Figure 7

[0035] It is a structure schematic view of the long-distance wave winding coil in the stator assembly of the present application. Figure 9

[0036] It is a structure schematic view of the short-distance wave winding coil in the stator assembly of the present application. Figure 10

[0037] It is a structure schematic view of the lap winding coil group in the stator assembly of the present application. Figure 11

[0038] It is an enlarged schematic view of C in the present application. Figure 12 Figure 11 It is a structure schematic view of the lap winding coil group in the stator assembly of the present application.

[0039] Figure 13 It is a structure schematic view of the first U-shaped coil in the stator assembly of the present application.

[0040] Figure 14

[0041] ​​​Figure 15 A structure diagram of a second U-shaped coil in a stator assembly of the present application.

[0042] Figure 16 A structure diagram of a third U-shaped coil in a stator assembly of the present application.

[0043] Figure 17 A structure diagram of a chain coil group in a stator assembly of the present application.

[0044] Figure 18 A structure diagram of four branch parallel connection in a stator assembly of the present application.

[0045] Figure 19 Another structure diagram of four branch parallel connection in a stator assembly of the present application.

[0046] In the figure: 100, stator winding; 1001, hairpin end; 1002, welding end;

[0047] 110, wave coil structure; 111, long-distance wave coil; 112, short-distance wave coil;

[0048] 120, lap coil structure; 121, lap coil group; 122, first U-shaped coil;

[0049] 123, second U-shaped coil; 124, third U-shaped coil;

[0050] 101, head; 102, first straight section; 103, second straight section;

[0051] 104, first welding section; 105, second welding section;

[0052] 200, stator core. DETAILED DESCRIPTION

[0053] The above embodiments of the present application will vary in specific details with respect to the matter which has been disclosed in the specification and drawings, and it is to be noted that other advantages and effects of the present application can be easily understood by those skilled in the art from this disclosure. The present application can also be implemented or applied in other different embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application.

[0054] It is to be noted that the diagrams provided in the embodiments only schematically illustrate the basic concepts of the present application, and thus the diagrams only show the components related to the present application without drawing the components number, shape and size as in actual implementation, and the type, number and proportion of the components in actual implementation can be arbitrarily changed, and the component layout type can also be more complicated.

[0055] Please refer toFigures 1-19 The application provides a motor winding and a stator assembly, which can be applied to the fields of electric servo transmission and transportation, for example, the stator assembly and the motor applying the same can be applied to an electric vehicle. The application has the advantages that the welding end has consistent slot pitch, the complexity of the manufacturing process is reduced, the processing efficiency is improved, and the production cost is reduced. The application will be described in detail below through specific embodiments.

[0056] Referring to FIG. 1, Figure 1 In some embodiments, the application provides a stator assembly, which can include a stator winding 100 and a stator core 200. The stator winding 100 can include a plurality of phase windings, which are different from each other in electrical phase, for example, the stator winding 100 can include three phase windings. Each phase winding can include four branches, which can be connected in series or in parallel. The stator core 200 can be provided with a plurality of stator slots, which can be formed on the inner wall of the stator core 200. The stator slots can be arranged along the circumferential direction of the inner wall of the stator core 200, and the stator slots can be spaced apart at a predetermined slot pitch on the stator core 200. The upper and lower end surfaces of the stator core 200 can be defined as a hairpin end 1001 and a welding end 1002, respectively, the stator winding 100 can be inserted into the stator core 200 from the side of the hairpin end 1001, and the stator winding 100 can be welded at the welding end 1002.

[0057] Referring to FIG. 1, Figures 1-4 In some embodiments, the plurality of stator slots can be defined as a first stator slot, a second stator slot, a third stator slot, a fourth stator slot, and so on, along the circumferential direction of the stator core 200. For example, the stator core 200 can be provided with 48 stator slots along the circumferential direction. Each stator slot can be provided with a plurality of slot layers, and each stator slot can be provided with an even number of slot layers, for example, each stator slot can be provided with 8 slot layers. For example, the 8 slot layers can be sequentially defined as a first layer of slot layers, a second layer of slot layers, a third layer of slot layers, a fourth layer of slot layers, a fifth layer of slot layers, a sixth layer of slot layers, a seventh layer of slot layers, and an eighth layer of slot layers along the radial direction of the stator core 200 from the inside to the outside, that is, the first layer of slot layers can be located on the side close to the stator slot opening, and the sixth layer of slot layers can be located on the side close to the stator slot bottom. In addition, the specific number of slot layers of each stator slot is not limited, and the embodiments in the application are arranged from outside to inside in the order of 1-8, and in other embodiments, the slot layers can also be arranged from inside to outside in the order of 1-8.

[0058] Referring to FIG. 1, Figures 5-16As shown, in some embodiments, the stator winding 100 can include a plurality of lap winding coil sets 121, a plurality of long-pitch wave winding coils 111, and a plurality of short-pitch wave winding coils 112. In each branch of each phase winding, at least one lap winding coil set 121 can be included under one magnetic pole of one branch. The lap winding coil set 121 can include a plurality of U-shaped coils, and can include at least two U-shaped coils. For example, in embodiments of the present application, the lap winding coil set 121 can include three U-shaped coils. One end of a first U-shaped coil can be connected to one end of a second U-shaped coil, and the other end of the second U-shaped coil can be connected to one end of a third U-shaped coil. The other end of the first U-shaped coil can serve as an access end of the lap winding coil set 121, and the other end of the third U-shaped coil can serve as an exit end of the lap winding coil set 121. Adjacent lap winding coil sets 121 can be connected in series through long-pitch wave winding coils 111 or short-pitch wave winding coils 112. One end of a wave winding coil can be connected to an innermost U-shaped coil of one lap winding coil set 121, and the other end of the wave winding coil can be connected to an outermost U-shaped coil of an adjacent lap winding coil set 121. The plurality of long-pitch wave winding coils 111 and the plurality of short-pitch wave winding coils 112 can form a wave winding structure 110. The lap winding structure 120 and the wave winding structure 110 can form a chain coil set.

[0059] As shown in FIGS. 7-10, in some embodiments, the long-pitch wave winding coil 111 and the short-pitch wave winding coil 112 can include a connection portion, two straight segment portions, and two welding portions. In the connection portion, one end of the connection portion can be connected to one end of the first straight segment portion, and the other end of the connection portion can be connected to one end of the second straight segment portion. The two straight segment portions can be inserted into the stator slots of the stator core 200, and can be twisted at the welding end 1002 to form the two welding portions. The two welding portions of the long-pitch wave winding coil 111 and the short-pitch wave winding coil 112 can extend the same distance along one side of the welding end 1002 of the stator core 200, and can be equal to half of the pole pitch. For example, the long-pitch wave winding coil 111 and the short-pitch wave winding coil 112 can include a head portion 101, a first straight segment portion 102, a second straight segment portion 103, a first welding portion 104, and a second welding portion 105. In the connection portion, one end of the first straight segment portion 102 can be connected to the first welding portion 104, and one end of the second straight segment portion 103 can be connected to the second welding portion 105. The other end of the first straight segment portion 102 and the other end of the second straight segment portion 103 can be connected to the head portion 101.

[0060] In some embodiments, as shown in FIGS. 7-10, in each branch of each phase winding, the two straight segment parts of the long-pitch winding coil 111 and the short-pitch winding coil 112 can be radially different by seven slot layers. The span of the long-pitch winding coil 111 is denoted as yl, yl can be greater than the pole pitch of the stator winding 100, and the pole pitch of the stator winding 100 is denoted as y, for example, yl = y + 1. The span of the short-pitch winding coil 112 is denoted as y2, y2 can be less than the pole pitch of the stator winding 100, for example, y2 = y - 1.

[0061] In some embodiments, as shown in FIGS. 7-10, the first welding part 104 and the second welding part 105 in the long-pitch winding coil 111 and the short-pitch winding coil 112 can be away from each other, and the extension directions of the first welding part 104 and the second welding part 105 in the long-pitch winding coil 111 and the short-pitch winding coil 112 can be towards opposite directions, for example, the extension directions of the plurality of first welding parts 104 can be towards along a clockwise direction or along an anticlockwise direction, and the extension directions of the plurality of second welding parts 105 are opposite. Figures 7-10 In some embodiments, as shown in FIGS. 7-10, the first welding part 104 and the second welding part 105 in the long-pitch winding coil 111 and the short-pitch winding coil 112 can be away from each other, and the extension directions of the first welding part 104 and the second welding part 105 in the long-pitch winding coil 111 and the short-pitch winding coil 112 can be towards opposite directions, for example, the extension directions of the plurality of first welding parts 104 can be towards along a clockwise direction or along an anticlockwise direction, and the extension directions of the plurality of second welding parts 105 are opposite.

[0062] Figures 11-16 In some embodiments, as shown in FIGS. 7-10, the first welding part 104 and the second welding part 105 in the long-pitch winding coil 111 and the short-pitch winding coil 112 can be away from each other, and the extension directions of the first welding part 104 and the second welding part 105 in the long-pitch winding coil 111 and the short-pitch winding coil 112 can be towards opposite directions, for example, the extension directions of the plurality of first welding parts 104 can be towards along a clockwise direction or along an anticlockwise direction, and the extension directions of the plurality of second welding parts 105 are opposite.

[0063] In some embodiments, as shown in FIGS. 7-10, the first welding part 104 and the second welding part 105 in the long-pitch winding coil 111 and the short-pitch winding coil 112 can be away from each other, and the extension directions of the first welding part 104 and the second welding part 105 in the long-pitch winding coil 111 and the short-pitch winding coil 112 can be towards opposite directions, for example, the extension directions of the plurality of first welding parts 104 can be towards along a clockwise direction or along an anticlockwise direction, and the extension directions of the plurality of second welding parts 105 are opposite. Figures 11-16 ​As shown, in some embodiments, the span of the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 can be the same. In each branch of each phase winding, the circumferential stator slots occupied by the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 are the same, i.e. the first straight section 102 of the first U-shaped coil 122, the first straight section 102 of the second U-shaped coil 123 and the first straight section 102 of the third U-shaped coil 124 are located in the same circumferential stator slots, and the second straight section 103 of the first U-shaped coil 122, the second straight section 103 of the second U-shaped coil 123 and the second straight section 103 of the third U-shaped coil 124 are located in the same circumferential stator slots. The symmetry axis of the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 can be the same. The span of the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 is denoted as y3, and y3 can be equal to the pole pitch of the stator winding 100, for example y3=y.

[0064] Referring to Figures 11-16 As shown, in some embodiments, the lap winding coil set 121 can include at least three U-shaped coils, wherein the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 can include a head portion 101, a first straight section 102, a second straight section 103, a first welding portion 104 and a second welding portion 105. The first straight section 102 and the second straight section 103 can be used to insert into the stator slots, and the first straight section 102 and the second straight section 103 can be inserted into different stator slots. One end of the first straight section 102 can be connected with the first welding portion 104, and one end of the second straight section 103 can be connected with the second welding portion 105. The other end of the first straight section 102 and the other end of the second straight section 103 can be connected with the head portion 101. In each branch of each phase winding, the two straight sections of the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 can be radially different by one slot layer. The span of the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 is denoted as y4, for example y4=y.

[0065] Referring to Figures 11-16As shown in FIG. 1, in some embodiments, the first weld 104 and the second weld 105 in the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 can be close to each other, and the extension directions of the first weld 104 and the second weld 105 in the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 can be towards opposite directions, for example, the extension direction of the plurality of first welds 104 can be towards along a clockwise direction or along an anticlockwise direction, and the extension direction of the plurality of second welds 105 is opposite. Wherein, the extension directions of the two welds of the long-pitch wave coil 111, the short-pitch wave coil 112, the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 are not specifically limited, and must satisfy the wiring line diagram as shown in FIG. 1. Figures 2-4

[0066] As shown in FIG. 1, in some embodiments, the first weld 104 and the second weld 105 in the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 can be close to each other, and the extension directions of the first weld 104 and the second weld 105 in the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 can be towards opposite directions, for example, the extension direction of the plurality of first welds 104 can be towards along a clockwise direction or along an anticlockwise direction, and the extension direction of the plurality of second welds 105 is opposite. Wherein, the extension directions of the two welds of the long-pitch wave coil 111, the short-pitch wave coil 112, the first U-shaped coil 122, the second U-shaped coil 123 and the third U-shaped coil 124 are not specifically limited, and must satisfy the wiring line diagram as shown in FIG. 1. Figures 2-4 As shown in FIG. 1, in some embodiments, the head 101 of the long-pitch wave coil 111, the head 101 of the short-pitch wave coil 112, the head 101 of the first U-shaped coil 122 and the head 101 of the second U-shaped coil 123 are located on the same side, and the end of the stator winding 100 located away from the head 101 is the welding end 1002.

[0067] Figures 1-17 As shown in FIG. 1, in some embodiments, by winding in this winding manner, the winding structure of each phase winding of the stator winding 100 can be optimized, and this winding manner can make the wire-in ends and the wire-out ends of the four branches all arranged at the welding end 1002 of the stator winding 100. The wire-in ends of the first branch and the second branch are arranged at the first layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, and the wire-out ends of the first branch and the second branch are arranged at the second layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, so that the wire-in ends and the wire-out ends of the first branch and the second branch are convenient for welding. Similarly, the wire-in ends of the third branch and the fourth branch are arranged at the eighth layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, and the wire-out ends of the third branch and the fourth branch are arranged at the seventh layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, which is convenient for welding.

[0068] As shown in FIG. 1, in some embodiments, by winding in this winding manner, the winding structure of each phase winding of the stator winding 100 can be optimized, and this winding manner can make the wire-in ends and the wire-out ends of the four branches all arranged at the welding end 1002 of the stator winding 100. The wire-in ends of the first branch and the second branch are arranged at the first layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, and the wire-out ends of the first branch and the second branch are arranged at the second layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, so that the wire-in ends and the wire-out ends of the first branch and the second branch are convenient for welding. Similarly, the wire-in ends of the third branch and the fourth branch are arranged at the eighth layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, and the wire-out ends of the third branch and the fourth branch are arranged at the seventh layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, which is convenient for welding. Figures 1-17 As shown in FIG. 1, in some embodiments, by winding in this winding manner, the winding structure of each phase winding of the stator winding 100 can be optimized, and this winding manner can make the wire-in ends and the wire-out ends of the four branches all arranged at the welding end 1002 of the stator winding 100. The wire-in ends of the first branch and the second branch are arranged at the first layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, and the wire-out ends of the first branch and the second branch are arranged at the second layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, so that the wire-in ends and the wire-out ends of the first branch and the second branch are convenient for welding. Similarly, the wire-in ends of the third branch and the fourth branch are arranged at the eighth layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, and the wire-out ends of the third branch and the fourth branch are arranged at the seventh layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, which is convenient for welding.

[0069] As shown in FIG. 1, in some embodiments, by winding in this winding manner, the winding structure of each phase winding of the stator winding 100 can be optimized, and this winding manner can make the wire-in ends and the wire-out ends of the four branches all arranged at the welding end 1002 of the stator winding 100. The wire-in ends of the first branch and the second branch are arranged at the first layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, and the wire-out ends of the first branch and the second branch are arranged at the second layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, so that the wire-in ends and the wire-out ends of the first branch and the second branch are convenient for welding. Similarly, the wire-in ends of the third branch and the fourth branch are arranged at the eighth layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, and the wire-out ends of the third branch and the fourth branch are arranged at the seventh layer of slot layers of the stator core 200 and are circumferentially different by one stator slot, which is convenient for welding.​​Figures 2-4 As shown in some embodiments, in order to more clearly express the wiring structure of the application, the winding development diagram is described taking the A-phase coil group as an example. In the winding development diagram, only the winding of the A-phase coil group is drawn, and the winding of the B-phase and C-phase coil groups is not involved. The winding mode of the B-phase coil group and the C-phase coil group is the same as that of the A-phase coil group, and the only difference is that the slot numbers where the incoming wire end and the outgoing wire end are located are different. For example, the incoming wire end of the A-phase winding is 48th slot and 1st slot respectively, the incoming wire end of the B-phase winding can be 4th slot and 5th slot, and the incoming wire end of the C-phase winding can be 8th slot and 9th slot.

[0070] Please refer to Figures 2-17 As shown in some embodiments, each phase winding can include four branches. The following refers to Figures 2-4 The specific embodiments of the application are described in detail. Taking the winding mode of a three-phase 8-pole 48-slot motor with 8 conductors per slot as an example, the development diagram of the A-phase winding is as follows: Figure 2 The number of layers of the flat wire winding L = 8, and the pole pitch of the motor winding y = 6. Figure 2 A1X1 is the first branch of the A-phase winding, A2X2 is the second branch of the A-phase winding, A3X3 is the third branch of the A-phase winding, and A4X4 is the fourth branch of the A-phase winding. A1, A2, A3, A4, X1, X2, X3, X4 are outgoing ends, wherein A1, A2, A3, A4 are incoming wire ends of the winding, and X1, X2, X3, X4 are outgoing wire ends of the winding. A1, A2, X1, X2 can be located at the bottom of the stator slot, and A3, A4, X3, X4 can be located at the slot opening of the stator. In the winding development diagram, from left to right, there are 1st layer, 2nd layer, 3rd layer, 4th layer, 5th layer, 6th layer, 7th layer and 8th layer in each slot.

[0071] Please refer to Figures 2-3 As shown in some embodiments, the specific winding mode of the first branch A1X1 of the A-phase winding is as follows, for example, 48(1) represents the 1st layer slot of the 48th slot.

[0072] A1->48(1)->7(8)->13(7)->7(6)->13(5)->7(4)->13(3)->7(2)->13(1)->18(8)->24(7)->18(6)->24(5)->18(4)->24(3)->18(2)->24(1)->31(8)->37(7)->31(6)->37(5)->31(4)->37(3)->31(2)->37(1)->42(8)->48(7)->42(6)->48(5)->42(4)->48(3)->42(2)->X1.

[0073] Please refer to Figures 2-3As shown, in some embodiments, the specific winding method of the second branch A2X2 of phase A winding is as follows, for example, 1(1) represents the first layer of slot 1.

[0074] A2->1(1)->6(8)->12(7)->6(6)->12(5)->6(4)->12(3)->6(2)->12(1)->19(8)->25(7)->19(6)->25(5)->19(4)->25(3)->19(2)-> 25(1)->30(8)->36(7)->30(6)->36(5)->30(4)->36(3)->30(2)->36(1)->43(8)->1(7)->43(6)->1(5)->43(4)->1(3)->43(2)->X2.

[0075] Please see Figure 2 and Figure 4 As shown, in some embodiments, the specific winding method of the third branch A3X3 of phase A winding is as follows, for example, 48(8) represents the 8th slot layer of slot 48.

[0076] A3->48(8)->43(1)->37(2)->43(3)->37(4)->43(5)->37(6)->43(7)->37(8)

[0077] ->30(1)->24(2)->30(3)->24(4)->30(5)->24(6)->30(7)->24(8)->19(1)->13(2)->19(3)->13 (4)->19(5)->13(6)->19(7)->13(8)->6(1)->48(2)->6(3)->48(4)->6(5)->48(6)->6(7)->X3.

[0078] Please see Figure 2 and Figure 4 As shown, in some embodiments, the specific winding method of the fourth branch A4X4 of phase A winding is as follows, for example, 1(8) represents the 8th layer of slot 1.

[0079] A4->1(8)->42(1)->36(2)->42(3)->36(4)->42(5)->36(6)->42(7)->36(8)->31(1)->25(2)->31(3)->25(4)->31(5)->25(6)->31(7)->25(8)->18(1)->12(2)->18(3)->12(4)->18(5)->12(6)->18(7)->12(8)->7(1)->1(2)->7(3)->1(4)->7(5)->1(6)->7(7)->X4.

[0080] Referring to Figures 2-3 As shown in FIG. 6, in some embodiments, from the above winding manner, it can be seen that the lead-in ends A1, A2 of the first branch A1X1 and the second branch A2X2 are different by one slot in the circumferential direction, and the lead-in ends A1, A2 are located in the same slot layer. The lead-out ends X1, X2 of the first branch A1X1 and the second branch A2X2 are different by one slot in the circumferential direction, and the lead-out ends X1, X2 are located in the same slot layer. The lead-in end A1 and the lead-out end X1 of the first branch are different by six stator slots in the circumferential direction, and the lead-in end A1 and the lead-out end X1 of the first branch are different by one slot layer in the radial direction. The lead-in end A2 and the lead-out end X2 of the second branch are different by six stator slots in the circumferential direction, and the lead-in end A2 and the lead-out end X2 of the second branch are different by one slot layer in the radial direction. It should be noted that "different by" can refer to the difference between two slot numbers, for example, the difference between slot No. 3 and slot No. 9 is six slots. In addition, "different by" can also refer to the difference between two slot layers, for example, the difference between the first slot layer and the fourth slot layer is three slot layers.

[0081] Referring to Figure 2 and Figure 4 As shown in FIG. 6, in some embodiments, from the above winding manner, it can be seen that the lead-in ends A1, A2 of the first branch A1X1 and the second branch A2X2 are different by one slot in the circumferential direction, and the lead-in ends A1, A2 are located in the same slot layer. The lead-out ends X1, X2 of the first branch A1X1 and the second branch A2X2 are different by one slot in the circumferential direction, and the lead-out ends X1, X2 are located in the same slot layer. The lead-in end A1 and the lead-out end X1 of the first branch are different by six stator slots in the circumferential direction, and the lead-in end A1 and the lead-out end X1 of the first branch are different by one slot layer in the radial direction. The lead-in end A2 and the lead-out end X2 of the second branch are different by six stator slots in the circumferential direction, and the lead-in end A2 and the lead-out end X2 of the second branch are different by one slot layer in the radial direction. It should be noted that "different by" can refer to the difference between two slot numbers, for example, the difference between slot No. 3 and slot No. 9 is six slots. In addition, "different by" can also refer to the difference between two slot layers, for example, the difference between the first slot layer and the fourth slot layer is three slot layers.

[0082] Referring to Figures 2-3In some embodiments, as shown in FIG. 1, in the first branch of each phase winding, under one group of lap winding coils 121, one welding portion of the group of lap winding coils 121 and one welding portion of the long-pitch wave winding coil 111 are the leading ends, and the other welding portion of the long-pitch wave winding coil 111 is connected to the other group of lap winding coils 121 adjacent in the circumferential direction. That is, the groups of lap winding coils 121 adjacent in the circumferential direction are connected in series through the long-pitch wave winding coil 111. One welding portion of the long-pitch wave winding coil 111 is connected to the innermost U-shaped coil of one group of lap winding coils 121, and the other welding portion of the long-pitch wave winding coil 111 is connected to the outermost U-shaped coil of the adjacent group of lap winding coils 121. The U-shaped coils of the remaining groups of lap winding coils 121 and the U-shaped coils of the other groups of lap winding coils 121 adjacent in the circumferential direction are connected through the long-pitch wave winding coil 111 or the short-pitch wave winding coil 112. The long-pitch wave winding coil 111 and the short-pitch wave winding coil 112 are arranged alternately in the circumferential direction of the stator core 200.

[0083] Referring to FIG. 1, Figures 2-3 In some embodiments, as shown in FIG. 1, in the second branch of each phase winding, under one group of lap winding coils 121, one welding portion of the group of lap winding coils 121 and one welding portion of the short-pitch wave winding coil 112 are the leading ends, and the other welding portion of the short-pitch wave winding coil 112 is connected to the other group of lap winding coils 121 adjacent in the circumferential direction. That is, the groups of lap winding coils 121 adjacent in the circumferential direction are connected in series through the short-pitch wave winding coil 112. One welding portion of the short-pitch wave winding coil 112 is connected to the innermost U-shaped coil of one group of lap winding coils 121, and the other welding portion of the short-pitch wave winding coil 112 is connected to the outermost U-shaped coil of the adjacent group of lap winding coils 121. The U-shaped coils of the remaining groups of lap winding coils 121 and the U-shaped coils of the other groups of lap winding coils 121 adjacent in the circumferential direction are connected through the long-pitch wave winding coil 111 or the short-pitch wave winding coil 112. The long-pitch wave winding coil 111 and the short-pitch wave winding coil 112 are arranged alternately in the circumferential direction of the stator core 200.

[0084] Referring to FIG. 1, Figure 2 and Figure 4As shown, in some embodiments, in the third branch of each phase winding, under one lapped coil group 121 of the third branch, a welded portion of the lapped coil group 121 and a welded portion of the long-pitch wave-wound coil 111 are leads, and the other welded portion of the long-pitch wave-wound coil 111 is connected to another circumferentially adjacent lapped coil group 121. That is, adjacent lapped coil groups 121 are connected in series through long-pitch wave-wound coils 111. One welded portion of the long-pitch wave-wound coil 111 is connected to the innermost U-shaped coil of one lapped coil group 121, and the other welded portion of the long-pitch wave-wound coil 111 is connected to the outermost U-shaped coil of the adjacent lapped coil group 121. The U-shaped coils of the remaining lapped coil groups 121 are connected to the U-shaped coils of another circumferentially adjacent lapped coil group 121 by either a long-pitch wave-wound coil 111 or a short-pitch wave-wound coil 112. Among them, the long-pitch wave-wound coil 111 and the short-pitch wave-wound coil 112 are alternately arranged along the circumference of the stator core 200.

[0085] Please see Figure 2 and Figure 4 As shown, in some embodiments, in the fourth branch of each phase winding, under one lapped coil group 121 of the fourth branch, a welded portion of the lapped coil group 121 and a welded portion of the short-pitch wave-wound coil 112 are leads, and the other welded portion of the short-pitch wave-wound coil 112 is connected to another circumferentially adjacent lapped coil group 121. That is, adjacent lapped coil groups 121 are connected in series through short-pitch wave-wound coils 112. One welded portion of the short-pitch wave-wound coil 112 is connected to the innermost U-shaped coil of one lapped coil group 121, and the other welded portion of the short-pitch wave-wound coil 112 is connected to the outermost U-shaped coil of the adjacent lapped coil group 121. The U-shaped coils of the remaining lapped coil groups 121 are connected to the U-shaped coils of another circumferentially adjacent lapped coil group 121 by either a long-pitch wave-wound coil 111 or a short-pitch wave-wound coil 112. Among them, the long-pitch wave-wound coil 111 and the short-pitch wave-wound coil 112 are alternately arranged along the circumference of the stator core 200.

[0086] Please see Figures 2-4 As shown, in some embodiments, in the same branch, when the number of lapped coil groups 121 is even, the number of long-pitch wave-wound coils 111 and short-pitch wave-wound coils 112 is the same. For example, in the same branch, the number of lapped coil groups 121 is 4, the number of long-pitch wave-wound coils 111 is 2, and the number of short-pitch wave-wound coils 112 is 2.

[0087] Please see Figures 18-19 As shown, in some embodiments, the four branches can be connected in parallel to form a single phase winding. Figure 18 In this configuration, within each phase winding, the lead terminals A1, A2, A3, and A4 of the four branches are connected, and the output terminals X1, X2, X3, and X4 of the four branches are connected, forming a star connection between the three phase windings A, B, and C.Figure 19 In each phase winding, the lead ends A1, A2, A3 and A4 of the four branches are connected, wherein the outgoing line ends X1 and X2 of the first branch and the second branch are connected to represent a first connection point, and the outgoing line ends X3 and X4 of the third branch and the fourth branch are connected to represent a second connection point. In the three-phase winding A, B and C, the first connection points of the three-phase winding are connected to form a star connection, and the second connection points of the three-phase winding are connected to form another star connection.

[0088] Referring to Figures 1-19 As shown in the drawings, in some embodiments, the 8-layer flat wire winding only includes 2 types of wave winding coils and 3 types of lap winding coils, a total of 5 hairpin coils, having the characteristics of less mold, low floor area, low cost and the like. Each branch includes coils of the first layer to the eighth layer, which are completely symmetrical on the magnetic circuit, and the electrical parameters such as resistance and inductance are completely equal, eliminating the loop current problem caused by the asymmetric structure, reducing noise and improving efficiency.

[0089] In summary, through the arrangement of the winding described above, the twist slot distance of the winding welding end is consistent, the complexity of the manufacturing process is reduced, and the production cost is reduced. The bridge line is cancelled, the winding connection mode is simplified, thereby simplifying the process and improving the processing efficiency.

[0090] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles, and those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept, for example, the technical solutions formed by replacing the above features with the technical features disclosed in the present application (but not limited to) having similar functions.

[0091] In addition to the technical features described in the specification, the remaining technical features are known to those skilled in the art, and in order to highlight the innovative features of the present application, the remaining technical features will not be described here.

Claims

1. A motor winding, characterized in that, include: Multiphase windings, each phase of the winding including multiple branches, the branches including: Multiple lapped coil groups, each comprising multiple U-shaped coils, wherein the span of the U-shaped coils is y, where y represents the pole pitch of the motor; and The wave-wound coil has a span of y+1 for the long-pitch wave-wound coil and a span of y-1 for the short-pitch wave-wound coil. Within a single branch, the spans of the wave-wound coil are alternately set to y+1 and y-1. The adjacent stacked coil groups are connected in series through the wave-wound coil, and one end of the wave-wound coil is connected to the innermost U-shaped coil of the stacked coil group, and the other end of the wave-wound coil is connected to the outermost U-shaped coil of the adjacent stacked coil group. In the same branch of each phase winding, long-pitch wave-wound coils and short-pitch wave-wound coils are alternately arranged along the same circumference of the stator core; both long-pitch and short-pitch winding coils include two welded parts, and the two welded parts of the long-pitch winding coil and the two welded parts of the short-pitch winding coil extend in opposite directions. The U-shaped coil includes a welding part with a span of y / 2, and adjacent U-shaped coils are connected through the welding part; In each branch of each phase winding, under two circumferentially adjacent magnetic poles, the stator slot difference of the lapped coil groups of the same slot layer in the circumferential direction is L1, where L1=y+1 or L1=y-1.

2. The motor winding according to claim 1, characterized in that, Within a single stacked coil group, multiple U-shaped coils are connected in series.

3. The motor winding according to claim 2, characterized in that, The welded portions of the U-shaped coils are close to each other and extend in opposite directions.

4. The motor winding according to claim 1, characterized in that, The branches are connected in parallel, and the number of branches is a positive integer greater than or equal to 4.

5. A stator assembly, characterized in that, include: The iron core is provided with multiple stator slots, which are distributed along the circumference of the iron core; Multiphase windings, wherein the windings are wound on the iron core, and each phase of the winding includes multiple branches, the branches including: Multiple lapped coil groups, each comprising multiple U-shaped coils, wherein the span of the U-shaped coils is y, where y represents the pole pitch of the motor; and The wave-wound coil has a span of y+1 for the long-pitch wave-wound coil and a span of y-1 for the short-pitch wave-wound coil. Within a single branch, the spans of the wave-wound coil are alternately set to y+1 and y-1. The adjacent stacked coil groups are connected in series through the wave-wound coil, and one end of the wave-wound coil is connected to the innermost U-shaped coil of the stacked coil group, and the other end of the wave-wound coil is connected to the outermost U-shaped coil of the adjacent stacked coil group. In the same branch of each phase winding, long-pitch wave-wound coils and short-pitch wave-wound coils are alternately arranged along the same circumference of the stator core; both long-pitch and short-pitch winding coils include two welded parts, and the two welded parts of the long-pitch winding coil and the two welded parts of the short-pitch winding coil extend in opposite directions. The U-shaped coil includes a welding part with a span of y / 2, and adjacent U-shaped coils are connected through the welding part; In each branch of each phase winding, under two circumferentially adjacent magnetic poles, the stator slot difference of the lapped coil groups of the same slot layer in the circumferential direction is L1, where L1=y+1 or L1=y-1.

6. The stator assembly according to claim 5, characterized in that, The stator slots of the iron core are provided with N slot layers, and N is an even number.

7. The stator assembly according to claim 6, characterized in that, Within a single lapped coil group, the U-shaped coil is located between the second slot layer and the (N-1)th slot layer.

8. The stator assembly according to claim 6, characterized in that, The U-shaped coil includes: Two straight segments; and The connecting part is the part that connects the two straight segments; In the radial direction of the motor core, there is a slot layer between the two straight segments located within a single U-shaped coil.

9. The stator assembly according to claim 6, characterized in that, One end of the wave-wound coil is located in the first slot layer of the iron core, and the other end of the wave-wound coil is located in the Nth slot layer of the iron core.

Images