Motor stator, motor and vehicle

Abstract

The present application provides a motor stator, including a stator core and a winding. The stator core includes a plurality of stator slots, and each adjacent three stator slots constitute a stator slot group. A plurality of wire slots are arranged in each stator slot, and a plurality of wire slot layers that are sequentially surrounded are formed in the stator core. The winding includes a three-phase winding, and the three-phase winding is alternately wound around different stator slot groups and each wire slot layer in sequence. Each phase winding includes a plurality of U-shaped wires, and the U-shaped wire includes a bent end and a welding end connected in series between two U-shaped wires. Two adjacent wire slot layers are bridged by a bent end or a welding end. The bent ends have the same shape and the same span; the span and the twist angle of the welding end are also equal. The motor stator of the present application reduces the number of U-shaped wires by setting a uniform U-shaped wire to bridge between adjacent wire slot layers, thereby reducing the process difficulty and manufacturing cost of the motor stator. The present application also provides a motor and a vehicle.

Description

Technical Field

[0001] The present application relates to the field of motors, and in particular to a motor stator, a motor using the motor stator, and a vehicle. Background Art

[0002] Flat wire motors have the characteristics of high copper full rate, good heat dissipation, strong pressure resistance, high torque density and power density, etc., and are gradually being used in the fields of new energy vehicles. Electric vehicles or hybrid vehicles driven by flat wire motors are relatively lighter, have longer driving range, and have higher internal space utilization. However, due to considerations such as the balance between branches, the winding method of the stator winding of the flat wire motor is usually more complicated, and the types of U-shaped wires used are relatively more, which correspondingly increases the process complexity and manufacturing cost of the flat wire motor. Summary of the invention

[0003] The present application provides a motor stator, the number of U-shaped wires used in the winding of which is relatively small, thereby controlling the process difficulty and manufacturing cost of the motor stator. The present application also provides a motor using the motor stator, and a vehicle. The present application specifically includes the following technical solutions:

[0004] In a first aspect, the present application provides a motor stator, comprising a stator core and a winding; the stator core is cylindrical, comprising an inner wall and a plurality of stator slots arranged on the inner wall, the plurality of stator slots are evenly distributed along the circumference of the inner wall, and every three adjacent stator slots constitute a stator slot group; in the radial direction of the stator core, a plurality of line slots are arranged in each stator slot, and the radius of each line slot in each stator slot from the rotation center of the stator core is different; in the circumferential direction of the stator core, the line slots with the same radius in each stator slot are surrounded to form a line slot layer;

[0005] The winding comprises a three-phase winding, which is alternately wound on different stator slot groups along the circumference of the stator core, and is also alternately wound on each line slot layer; each phase winding comprises at least one branch, and at least one branch comprises a plurality of U-shaped wires connected in series, each U-shaped wire comprises a bent end, a welding end is formed between two U-shaped wires connected in series, the bent end and the welding end are alternately bridged between each stator slot group, and alternately bridged between line slot layers at the same time; the bent ends of the U-shaped wires or the welding ends between the U-shaped wires are bridged between the same two adjacent line slot layers; and the bent ends bridged between the same two adjacent line slot layers have the same shape and the same span; the span and the twist angle of the welding ends bridged between the same two adjacent line slot layers are equal.

[0006] The stator of the motor of the present application is provided with stator slots arranged circumferentially in the iron core, so that the three-phase winding can be wound alternately in sequence. The wire slots arranged in the stator slots form multiple wire slot layers. While the three-phase winding is wound in the circumferential direction, it can also be wound between different wire slot layers to improve the copper full rate of the stator iron core. Specifically, each phase winding is connected between each wire slot layer and between each stator slot group through at least one branch. Each branch includes a plurality of U-shaped wires connected in series.

[0007] The stator of the motor of the present application forms the above-mentioned branch circuit bridging structure through the bent end in the U-shaped wire and the welding end connected between two adjacent U-shaped wires. Between any two wire slot layers, U-shaped wires of the same shape and span are used for bridging, or welding ends of the same span and the same twist angle are used for bridging, so that U-shaped wires of the same shape can be arranged between the two adjacent wire slot layers, and the bent ends have the same shape and equal span. Since the bent ends and the welding ends alternately span between each wire slot layer, the welding end connected between the two U-shaped wires can also be connected in the same span and the same twist angle.

[0008] Therefore, the number of U-shaped wires used to bridge between adjacent wire slot layers in the motor stator of the present application only depends on the number of two adjacent wire slot layers bridged by the U-shaped wires. Compared with the winding method of windings bridged between multiple wire slot layers, the motor stator of the present application requires fewer types of U-shaped wires, which reduces the manufacturing cost of the motor stator. At the same time, the reduction in the number of U-shaped wires also simplifies the winding process of the motor stator, which can improve manufacturing efficiency and yield rate.

[0009] In a possible implementation, the span of the bent ends spanning between two adjacent wire trough layers is a whole distance; the span of the welding ends spanning between two adjacent wire trough layers is also a whole distance.

[0010] In this implementation, the span of the U-shaped wire is set to be a full span, so that the U-shaped wire can be located in the same phase band during a single span along the radial direction of the stator core, simplifying the winding process of the U-shaped wire.

[0011] In one possible implementation, three adjacent stator slots in each stator slot group form three phase bands in sequence, the line slot layer includes a slot opening layer with the smallest radius size, and a slot bottom layer with the largest radius size, the branch also bridges between the stator slot groups in the slot opening layer, and the phase bands connected by the branch between two stator slot groups are different; and / or, the branch also bridges between the stator slot groups in the slot bottom layer, and the phase bands connected by the branch between two stator slot groups are different.

[0012] In this implementation, different phase belts are connected in series on the same branch, so that the angle difference between different phase belts can be eliminated and the circulation interference between different branches can be avoided.

[0013] In a possible implementation, each phase winding includes a slot-changing section, which bridges between the stator slot groups in the slot opening layer, and is also connected between the stator slot groups in the slot bottom layer; the slot-changing section includes three passages, and the three passages are combined with different spans to realize phase band switching of each branch in the phase winding between two stator slot groups.

[0014] In this implementation, the slot changing section realizes phase belt switching between two adjacent stator slot groups, which is beneficial to simplify the winding process of the slot opening layer and the slot bottom layer and improve the yield rate.

[0015] In a possible implementation, the span combination of the three passages in the slot-changing section may be 10 / 10 / 7, or may be 8 / 8 / 11.

[0016] In a possible implementation, the span combination of the three passages in the slot changing section at the slot bottom layer is the same as the span combination of the three passages in the slot changing section at the slot opening layer.

[0017] In this implementation, the span combinations of the slot bottom layer and the slot mouth layer are set to be the same, so that three different phase belts can be connected in series in the same branch, which can better eliminate the angle difference in the same branch.

[0018] In one possible implementation, the phase winding includes a first slot change line and a second slot change line, the first slot change line is connected across the stator slots in the slot opening layer, and the second slot change line is connected between the stator slots in the slot bottom layer, and the first slot change line and the second slot change line are both used to realize phase belt switching of each branch in the phase winding.

[0019] In this implementation, for any stator slot group in the slot opening layer and the slot bottom layer, through the setting of the first slot changing line and the second slot changing line, the stator slot group can be bridged with the stator slot groups on both sides thereof, respectively, thereby broadening the flexibility of the winding when changing the tape in the same layer, and facilitating the realization of more winding methods and parallel branch designs.

[0020] In a possible implementation manner, the spans of the first slot-changing lines are equal; and / or the spans of the second slot-changing lines are equal.

[0021] In this implementation, the spans of the first slot-changing line and / or the second slot-changing line are set to be equal, which further reduces the types of U-shaped wires used in the motor stator and can better control the manufacturing cost of the motor stator.

[0022] In a possible implementation, the number of slot layers is an even number, and the branches are connected across different stator slots through the bent ends of the U-shaped wires at both the slot opening layer and the slot bottom layer; or

[0023] The number of line slot layers is an odd number, the branch is bridged between different stator slots in the slot opening layer through the bent end of the U-shaped wire, and the branch is bridged between different stator slots in the slot bottom layer through the welding end; or the branch is bridged between different stator slots in the slot opening layer through the welding end, and the branch is bridged between different stator slots in the slot bottom layer through the bent end of the U-shaped wire.

[0024] In this implementation, based on the difference in the number of wire slot layers, the structure that realizes the cross-slot function can be specifically set in the slot opening layer and the slot bottom layer, and the stability of the characteristics of each branch can be ensured by controlling the bending end or the welding end.

[0025] In a second aspect, the present application provides a motor, comprising a motor rotor and the motor stator provided in the first aspect of the present application, wherein the motor rotor is located inside the motor stator.

[0026] In a third aspect, the present application provides a vehicle, comprising the motor provided in the second aspect of the present application.

[0027] It can be understood that in the motor provided in the second aspect of the present application and the vehicle provided in the third aspect of the present application, because the motor stator provided in the first aspect of the present application is adopted, the manufacturing costs of the motor and the vehicle of the present application are respectively controlled, and the beneficial effects produced by each are roughly the same, which will not be described one by one here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a frame structure of a motor provided by the present application;

[0029] Figure 2 It is a structural schematic diagram of a motor stator in a motor provided by the present application;

[0030] Figure 3 It is a structural schematic diagram of a stator core in a motor stator provided in the present application;

[0031] Figure 4 It is a structural schematic diagram of a stator slot in a motor stator provided by the present application;

[0032] Figure 5 It is a schematic diagram of the structure of multiple slot layers in a motor stator provided by the present application;

[0033] Figure 6 It is a schematic diagram of the structure of a winding in a motor stator provided by the present application;

[0034] Figure 7It is a structural schematic diagram of a single-phase winding in a motor stator provided by the present application;

[0035] Figure 8 This is a phase diagram of windings in each slot in a motor stator provided by the present application;

[0036] Fig. 9 It is a structural schematic diagram of a branch in a single-phase winding in a motor stator provided by the present application;

[0037] Fig.10 It is a structural schematic diagram of a U-shaped line on a branch line of a motor stator provided by the present application;

[0038] Fig.11 This is a schematic diagram of the winding route of a branch in each slot of a motor stator provided by the present application;

[0039] Fig.12 It is a schematic diagram of the winding route of another branch in each wire slot of a motor stator provided by the present application;

[0040] Fig.13 This is a schematic diagram of the winding route of another branch in each wire slot in a motor stator provided by the present application;

[0041] Fig.14 This is a schematic diagram of the winding route of a single-phase winding in each slot in a motor stator provided by the present application;

[0042] Fig.15 It is a schematic diagram of a winding route of another winding method of a single-phase winding in a motor stator provided by the present application;

[0043] Fig.16 This is a schematic diagram of a winding route of a single-phase winding in a motor stator provided by the present application;

[0044] Fig.17 It is a schematic diagram of a winding route of another winding method of a single-phase winding in a motor stator provided by the present application;

[0045] Fig.18 It is a schematic diagram of the structure of a single-phase winding wound in a middle slot layer in a motor stator provided by the present application;

[0046] Fig.19 It is a schematic diagram of the structure of a single-phase winding wound in a slot layer in a motor stator provided by the present application;

[0047] Fig. 20 It is a schematic diagram of the structure of a single-phase winding wound in a slot bottom layer in a motor stator provided by the present application;

[0048] Fig.21It is a schematic diagram of the structure of a motor stator provided by the present application, in which a three-phase winding is wound in a middle slot layer;

[0049] Fig. 22 It is a schematic diagram of the structure of a three-phase winding wound in a slot layer in a motor stator provided by the present application;

[0050] Fig.23 It is a schematic diagram of the structure of a motor stator provided by the present application in which a three-phase winding is wound in a slot bottom layer;

[0051] Fig.24 It is a schematic diagram of a winding route of another winding method of a single-phase winding in a motor stator provided by the present application;

[0052] Fig.25 This is a schematic diagram of a motor stator provided by the present application, in which six parallel branches are connected in star connection;

[0053] Fig.26 This is a schematic diagram of a motor stator provided by the present application, in which six parallel branches are connected in a triangle manner;

[0054] Fig. 27 This is a schematic diagram of a motor stator provided by the present application, in which three parallel branches are connected in a star configuration;

[0055] Fig.28 This is a schematic diagram of a motor stator provided by the present application, in which there are three parallel branches connected in a triangle manner;

[0056] Fig.29 This is a schematic diagram of a motor stator provided by the present application, in which two parallel branches are connected in a star configuration;

[0057] Fig.30 This is a schematic diagram of a motor stator provided by the present application, in which two parallel branches are connected in a triangle manner;

[0058] Fig.31 It is a schematic diagram of a winding route of another winding method of a single-phase winding in a motor stator provided by the present application;

[0059] Fig.32 This is a schematic diagram of a winding circuit of a motor stator provided by the present application, in which the belt is changed in the same layer by means of a slot-changing line method;

[0060] Fig.33 This is another winding circuit diagram of a motor stator provided by the present application, which adopts a slot-changing line method to change the belt in the same layer;

[0061] Fig.34 This is another winding circuit diagram of a motor stator provided by the present application, which adopts a slot-changing line method to change the belt in the same layer;

[0062] Fig.35 This is another winding circuit diagram of a motor stator provided by the present application, which adopts a slot-changing line method to change the belt in the same layer;

[0063] Fig.36 This is another winding circuit diagram of a motor stator provided by the present application, which adopts a slot-changing line method to change the belt in the same layer;

[0064] Fig.37 This is another winding circuit diagram of a motor stator provided by the present application, which adopts a slot-changing line method to change the belt in the same layer;

[0065] Fig.38 This is another winding circuit diagram of a motor stator provided by the present application, which adopts a slot-changing line method to change the belt in the same layer;

[0066] Fig.39 This is another winding circuit diagram of a motor stator provided by the present application, which adopts a slot-changing line method to change the belt in the same layer. DETAILED DESCRIPTION

[0067] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of this application.

[0068] Figure 1 A schematic diagram of the frame structure of a motor 400 provided in the present application.

[0069] The motor 400 includes a motor stator 300 and a motor rotor 410, wherein the motor stator 300 is substantially cylindrical, and the motor rotor 410 is located inside the motor stator 300. The motor stator 300 has a geometric center axis. Figure 1 The central axis 301 is shown in the figure. The center of rotation of the motor rotor 410 coincides with the central axis 301. The motor stator 300 is wound with a winding 200, and a plurality of pairs of magnetic poles (not shown) can be provided on the motor rotor 410 corresponding to the winding 200. The magnetic poles can be permanent magnets arranged along the circumference of the motor rotor 410, or rotor windings wound on the motor rotor 410, and the rotor windings form conductive bars distributed along the circumference of the motor rotor 410. When the winding 200 is energized, a magnetic field is formed inside the motor stator 300. After inducing the magnetic field, the permanent magnets or conductive bars on the motor rotor 410 can drive the motor rotor 410 to rotate around the central axis 301, thereby realizing power output.

[0070] The motor 400 involved in the present application can be used in the vehicle involved in the present application. The vehicle of the present application can be an electric vehicle or a hybrid vehicle. The motor 400 can be housed in the vehicle and provide power for the vehicle to move. It can be understood that the application scenario of the motor 400 of the present application is not limited to vehicles, and it can also be applied to other devices that need to provide power output.

[0071] Figure 2 The structure of the motor stator 300 provided in this application is schematically shown.

[0072] The motor stator 300 includes a stator core 100 and a winding 200 . The winding 200 is wound on the stator core 100 .

[0073] For details, see Figure 3 The structure of the stator core 100 is shown as follows. The stator core 100 is generally cylindrical, and has an inner wall 110 and an outer wall 120 facing each other. The inner wall 110 and the outer wall 120 can be cylindrical, and the geometric centers of the inner wall 110 and the outer wall 120 coincide with each other, and both surround the central axis 301.

[0074] A plurality of stator slots 130 are also provided on the inner wall 110. The plurality of stator slots 130 are evenly distributed along the circumference of the inner wall 110. The plurality of stator slots 130 also extend in the radial direction of the motor stator 100 toward the outer wall 120. In the direction along the central axis 301, each stator slot 130 penetrates the stator core 100. The winding 200 passes through both ends of the stator slot 130 along the direction of the central axis 301 and is wound in each stator slot 130.

[0075] For details, see Figure 4 In the radial direction of the stator core 100, the stator slot 130 includes a slot end 131 and a slot bottom end 132 opposite to each other. The slot end 131 is connected to the inner wall 110 and forms a notch on the inner wall 110. The slot bottom end 132 is located away from the inner wall 110. Further, a plurality of wire slots 133 are provided in the stator slot 130, and each wire slot 133 is arranged in sequence from the slot end 131 to the slot bottom end 132, that is, each wire slot 133 is arranged in sequence along the radial direction of the stator core 100. The winding 200 passes through the stator slot 130, specifically, the winding passes through each wire slot 133.

[0076] The plurality of line slots 133 are arranged along the radial direction of the stator core 100. The distances between the line slots 133 in the same stator slot 130 and the central axis 301 are different, that is, the radii of the line slots 133 in the same stator slot 130 are different. In the circumferential direction of the stator core 100, the stator slots 130 are evenly distributed along the circumferential direction, and the line slots 133 in each stator slot 130 that are located on the same radius size are surrounded to form a line slot layer 140. Figure 4In the schematic diagram, the number of line slots 133 in a single stator slot 130 is 8, so Figure 5 As shown, eight wire slot layers 140 are formed by eight wire slots of different radius sizes on the stator core 100. The eight wire slot layers 140 are sequentially surrounded, wherein the wire slot layer 140 formed by the wire slots 133 with the smallest radius size is defined as a slot opening layer 141, and the wire slot layer 140 formed by the wire slots 133 with the largest radius size is defined as a slot bottom layer 142. The slot opening layer 141 is located in the innermost ring of the sequentially surrounded wire slot layers 140, and the slot bottom layer 142 is located in the outermost ring of the sequentially surrounded wire slot layers 140. It can be understood that in the remaining embodiments, as the number of wire slots 133 in a single stator slot 130 is different, the number of wire slot layers 140 formed in the stator core 100 is also different.

[0077] Please look back Figure 3 For the motor stator 300 of the present application, three adjacent stator slots 130 are defined in the circumferential direction of the stator core 100 to form a stator slot group 150. Figure 3 In the schematic diagram, the number of stator slots 130 is 54, and 18 stator slot groups 150 are formed. For the motor stator 300 of the present application, its winding 200 is a three-phase winding. Figure 6 , the winding 200 includes a U-phase winding 210, a V-phase winding 220 and a W-phase winding 230. The number of slots per pole per phase of the motor stator 300 is 3, corresponding to the three stator slots 130 in each stator slot group 150, that is, each phase winding passes through three adjacent stator slots 130 at the same time, and the three-phase winding is wound alternately in sequence along the circumference of the stator core 100. Therefore, in the motor stator 100 of this embodiment, the pole pitch of the motor 400 is:

[0078] 3 (three phases) × 3 (number of slots per pole per phase) = 9;

[0079] The number of stator slots 130 is 54, and the number of poles of the motor rotor 410 in the motor 400 of this embodiment is 6. Of course, for a motor with 3 slots per pole per phase, the pole slot combination of the motor can also be 8 poles and 72 slots, 10 poles and 90 slots, 12 poles and 108 slots, etc., which are not limited here. For the motor 400 with the above-mentioned various pole slot combinations, the pole pitch is 9, that is, the number of stator slots 130 between two adjacent magnetic poles is 9. For the winding 200, when it is wound on the stator core 100, the number of stator slots 130 when a single line is connected between two line slots 133 is the span. When the span is equal to the pole pitch, the span of the single line is the full pitch; when the span is greater than the pole pitch, the span of the line is the long pitch; when the span is less than the pole pitch, the span of the line is the short pitch.

[0080] It should be pointed out that the three phase windings shown in the figure are wound on the stator core 100 in a counterclockwise order, while in other embodiments, the three phase windings can also be wound on the stator core 100 in a clockwise order, which does not affect the functional realization of the motor stator 300 of the present application.

[0081] Figure 7 The structure of one phase winding in the winding 200 is illustrated by the U-phase winding 210. The U-phase winding 210 is wound in six different stator slot groups 150 at intervals along the circumference of the stator core 100. The six stator slot groups 150 are evenly distributed along the circumference of the stator core 100, and the distance between any two stator slot groups 150 is equal. In any one of the stator slot groups 150, the U-phase winding 210 is also wound on three stator slots 130 at the same time, and is also wound on the wire slots 133 of each stator slot 130 at the same time. That is, for any one of the stator slot groups 150 in the stator core 100 of the present application, it is only used to realize the winding of one phase winding, and the phases of the windings wound on the three adjacent stator slots 130 are the same.

[0082] For details, see Figure 8 The phase diagram of the winding 200 in each slot 133 of the motor stator 300 of the present application is shown. Figure 8 In the table, the horizontal axis represents the arrangement of the stator slots 130 sequentially developed along the same rotation direction, and the vertical axis represents the linear slots 133 sequentially arranged along the length direction of the stator slots 130. It can be seen that Figure 7 The U-phase winding 210 is distributed in 6 stator slot groups 150, namely slots 1-3, slots 10-12, slots 19-21, slots 28-30, slots 37-39, and slots 46-48. In each slot 133 of each stator slot group 150, only the U-phase winding 210 is wound.

[0083] Correspondingly, for Figure 8 The V-phase winding 220 shown in the figure is distributed in 6 groups of stator slot groups 150, namely slots 4-6, slots 13-15, slots 22-24, slots 31-33, slots 40-42, and slots 49-51. Each line slot 133 in each stator slot group 150 is only wound with the V-phase winding 220; the W-phase winding 230 is distributed in 6 groups of stator slot groups 150, namely slots 7-9, slots 16-18, slots 25-27, slots 34-36, slots 43-45, and slots 52-54. Each line slot 133 in each stator slot 150 is only used for winding the W-phase winding 220.

[0084] Thus, the three-phase windings are alternately wound in different stator slot groups 150 along the circumference of the stator core 100. Each stator slot group 150 is only used for winding the same phase. Between two adjacent stator slot groups 150 of the same phase, there are two stator slot groups 150 respectively wound with windings of different phases. For example, between the two adjacent stator slot groups 150 of 1-3 slots and 10-12 slots of the U-phase winding 210, there is also a stator slot group 150 (4-6 slots) of a V-phase winding 220 and a stator slot group 150 (7-9 slots) of a W-phase winding 230.

[0085] It should be noted that, for each stator slot 130 evenly distributed around the circumference, any stator slot 130 can be used as one slot. Figure 8 Each stator slot 130 of the stator core 100 shown in the figure may be a slot 1 as a starting point. Figure 3 Any stator slot 130 in the motor stator 300 of the present application is not particularly limited to this.

[0086] Furthermore, for the three stator slots 130 in the same stator slot group 150, based on the position and angle differences of the three stator slots 130, three different phase belts will be formed in sequence: I phase belt, II phase belt and III phase belt. The arrangement order of the three phase belts in each stator slot group 150 is the same. For example, in the stator slot group 150 with 1-3 slots, the first stator slot 130 (1 slot) is defined as the I phase belt, the second stator slot 130 slot (2 slots) is defined as the II phase belt, and the third stator slot 130 (3 slots) is defined as the III phase belt. That is, in the stator slot group 150 with 1-3 slots, the stator slot 130 close to the W phase winding 230 is defined as the I phase belt, the stator slot 130 close to the V phase winding 220 is defined as the III phase belt, and the stator slot 130 located between the I phase belt and the III phase belt is defined as the II phase belt.

[0087] Correspondingly, in the stator slot group 150 with 10-12 slots, the stator slots 130 with 10 slots are the I phase belt, the stator slots 130 with 11 slots are the II phase belt, and the stator slots 130 with 12 slots are the III phase belt; and in the V-phase line slots 220 and the W-phase line slots 230, the phase belts are also arranged in the same order: in the stator slot group 150 with 4-6 slots, the stator slots 130 with 4 slots are the I phase belt, the stator slots 130 with 5 slots are the II phase belt, and the stator slots 130 with 6 slots are the III phase belt; in the stator slot group 150 with 7-9 slots, the stator slots 130 with 7 slots are the I phase belt, the stator slots 130 with 8 slots are the II phase belt, and the stator slots 130 with 9 slots are the III phase belt. In addition, the order of the above three phase belts is also based on the counterclockwise winding of the three-phase winding. When the three-phase winding is wound clockwise, the positions of the I-phase belt and the III-phase belt are swapped accordingly.

[0088] Each phase winding also includes at least one branch 240. Considering the motor performance parameters and actual working conditions, the number of branches 240 in each phase winding can be six, three or two. Each branch 240 of the same phase is wound in sequence in different stator slot groups 150 along with the phase winding, and each branch 240 is connected in parallel to form a phase winding. Fig. 9 The structure of a branch 240 in the U-phase winding 210 is shown. Fig. 9 In the embodiment, the U-phase winding 210 is composed of three branches 240 connected in parallel. Fig. 9 The branches 240 shown are all wound in sequence in six different stator slot groups 150 along with the U-phase winding 210. Each branch 240 further includes an input terminal 241 and an output terminal 242, and a plurality of U-shaped wires 250 connected in series between the input terminal 241 and the output terminal 242.

[0089] Specific as Fig.10 As shown. The U-shaped line 250 includes two conductors 251 and a bent end 252 connected between the two conductors 251. Both conductors 251 are straight and roughly parallel. Each conductor 251 is inserted in a wire slot 133, and the wire slots 133 in which the two conductors 251 are inserted are located in different stator slot groups 150. The bent end 252 is bridged between the two conductors 251 to achieve electrical conduction between the two conductors 251. Each conductor 251 also extends a leg 253 on the side away from the bent end 252. The leg 253 can achieve the series connection between two adjacent U-shaped lines 250. Specifically, between the two U-shaped lines 250 connected in series, two legs 253 that are close to each other are welded to form a welding end 254 (see Fig. 9 ), the two U-shaped wires 250 can be connected in series through the welding end 254. When the welding end 254 is connected between the two U-shaped wires 250,

[0090] Both legs 253 form an angle relative to the conductor 251 to which they are connected, and the angle between a single leg 253 and the conductor 251 to which it is connected is defined as a twist angle. The twist angle can also be interpreted as the twist angle of the welding end 254. It can be understood that when there are multiple pairs of adjacent U-shaped wires 250 with the same span between the same two adjacent wire trough layers 140, the twist angles formed between each pair of adjacent U-shaped wires 250 are also equal. That is, between the same two adjacent wire trough layers 140, the twist angles of the welding ends 254 with the same span are all equal.

[0091] See also Fig.11 shown Fig. 9The winding route of the middle branch 240 in each wire slot 133 is shown. The branch 240 enters the 46th stator slot (1st) wire slot layer (hereinafter referred to as "N slot (M) layer" for simplicity of description) and exits the 39th slot (1) layer. The branch 240 passes through 46 slot (1) layer - 1 slot (2) layer - 10 (3) layer - 19 slot (4) layer - 28 slot (5) layer - 37 slot (6) layer - 46 slot (7) layer - 1 slot (8) layer - 11 slot (8) layer - 2 slot (7) layer - 47 slot (6) layer - 38 slot (5) layer - 29 slot (4) layer - 20 slot (3) layer - 11 slot (2) layer - 2 slot (1) layer - 12 slot (1) layer - 21 slot (2) layer - 30 slot (3) layer - 39 slot (4) layer - 48 slot (5) layer - 3 slot (6) layer - 12 slot (7) layer - 21 slot (8 ) layer - 28 slot (8) layer - slot 19 (7) layer - slot 10 (6) layer - 1 slot (5) layer - 46 slot (4) layer - 37 slot (3) layer - 28 slot (2) layer - 19 slot (1) layer - 29 slot (1) layer - 38 slot (2) layer - 47 slot (3) layer - 2 slot (4) layer - 11 slot (5) layer - 20 slot (6) layer - 29 slot (7) layer - 38 slot (8) layer - 48 slot (8) layer - 39 slot (7) layer - 30 slot (6) layer - 21 slot (5) layer - 12 slot (4) layer - 3 slot (3) layer - 48 slot (2) layer - 39 slot (1) layer.

[0092] It can be seen that in the embodiment of the present application, the branch 240 is wound around each stator slot group 150 and is also wound between different slot layers 140 along the radial direction of the stator core 100. The branch 240 is bridged between two adjacent stator slot groups 150 along the circumferential direction of the stator core 100, and is also bridged between two adjacent slot layers 140 along the radial direction of the stator core 100. As mentioned above, the two conductors 251 of the U-shaped wire 250 are used to pass through each slot 133, and the bent end 252 connected between the two conductors 251 and the welding end 254 connected between two adjacent U-shaped wires 250 are used to realize the bridging action of the branch 240. That is, the branch 240 realizes its bridging between two adjacent stator slot groups 150 and between two adjacent slot layers 140 through the bent end 252 and the welding end 254. Since a single U-shaped wire 250 is provided with a bent end 252 and a welding end 254 is provided between two U-shaped wires 250, in this embodiment, the bent end 252 and the welding end 254 are alternately connected between the conductors 251 to achieve the bridging function of the straight line 240 between the stator slot group 150 and the line slot layer 140. The welding end 254 may include a leg 253 of each of two adjacent U-shaped wires 250 and a welding point structure formed by welding the two legs 253.

[0093] exist Fig.11In the schematic diagram, the solid arrow is used to indicate the bent end 252, and the dotted arrow is used to indicate the welding end 254. It can be seen that after the branch 240 enters the stator core 100 from the 46 slot (1) layer, the first U-shaped wire 250 of the branch 240 is inserted between the 1 slot (2) layer and the 10 (3) layer. The 46 slot (1) layer and the 1 slot (2) layer are connected and cross-connected through the welding end 254 (here, the welding between the input end 241 of the branch 240 and the U-shaped wire 250 can also be regarded as the structure of the welding end 254). Then, the 1 slot (2) layer and the 10 (3) layer are connected through the bent end 252 of the U-shaped wire 250, and the 10 (3) layer and the 9 slot (4) layer are connected again through the welding end 254... and so on. In this embodiment, the span of the U-shaped wire 250 spanning between the two wire slot layers 140 is a full distance of 9, and the span of the welding end 254 spanning between the two wire slot layers 140 is also a full distance of 9.

[0094] When the branch 240 is sequentially wound between the 46 slot (1) layer - the 1 slot (2) layer - the 10 (3) layer - the 19 slot (4) layer - the 28 slot (5) layer - the 37 slot (6) layer - the 46 slot (7) layer - the 1 slot (8) layer, the branch 240 is respectively wound in the I phase band of the six stator slot groups 150; and when the branch 240 is sequentially wound between the 11 slot (8) layer - the 2 slot (7) layer - the 47 slot (6) layer - the 38 slot ( When the branch 240 is wound between the 5th slot layer-29th slot (4th slot layer-20th slot (3th slot layer-11th slot (2th slot layer-2nd slot (1th slot layer), and is wound between the 12th slot (1th slot layer-21st slot (2th slot layer-30th slot (3th slot layer-39th slot (4th slot layer-48th slot (5th slot layer-3rd slot (6th slot layer-12th slot (7th slot layer-21st slot (8th slot layer), the branch 240 is respectively wound in the II phase band and the III phase band of the six stator slot groups 150. Subsequently, when the branch 240 is wound between the 28th slot (8th slot layer-19th slot (1th slot), it is also in the I phase band; when the branch 240 is wound between the 29th slot (1th slot layer-38th slot (8th slot layer), it is in the II phase band; when the branch 240 is wound between the 48th slot (8th slot layer-39th slot (1th slot), it is in the III phase band.

[0095] The branch 240 also realizes the conversion between phase belts in the slot layer 141 (8th layer) and the slot bottom layer 142 (1st layer). Specifically, after the branch 240 is wound from the 46 slots (1) layer to the 1 slot (8) layer and completes the winding between the eight I phase belts, it jumps from the 1 slot to the 11 slot at the slot layer 141, where the 1 slot is located in the I phase belt and the 11 slot is located in the II phase belt; thereafter, the branch 240 is successively wound from the 11 slots (8) layer to the 2 slots (1) layer to complete the winding between the eight II phase belts, and the branch 240 jumps from the 2 slots to the 12 slots at the slot bottom layer 142, where the 12 slots are located in the III phase belt; then, the branch is wound from the 12 slots (1) layer to the 21 slots (8) layer to complete the winding between the eight III phase belts.

[0096] exist Fig.11 In the diagram, the "-" symbol is used to indicate the cross-connection of the branch 240 between two adjacent slot layers 140, and the "——" symbol is used to indicate the cross-connection of the branch 240 between different phase belts in the same slot layer 140. On the winding path of the entire branch 240 shown in the figure, the branch 240 completes two same-layer belt changes from the I phase belt to the II phase belt (1 slot (8) layer to 11 slot (8) layer, 19 slot (1) layer to 29 slot (1) layer), and two same-layer belt changes from the II phase belt to the III phase belt (2 slot (1) layer to 12 slot (1) layer, 38 slot (8) layer to 48 slot (8) layer), and one same-layer belt change from the III phase belt to the I phase belt (21 slot (8) layer to 28 slot (8) layer). Therefore, in this branch 240, a total of five same-layer belt changes between six phase belts are realized. The branch 240 enters from the I phase belt, and is connected in series with the II phase belt, the III phase belt, the I phase belt, the II phase belt, the III phase belt, and finally leads out from the III phase belt. The number of I phase belts, the number of II phase belts, and the number of III phase belts connected by the branch 240 are all 2.

[0097] Furthermore, the winding of the branch 240 in the I phase belt is firstly wound from the slot layer 141 to the slot bottom layer 142 (46 slots (1) layer-1 slot (8) layer), and then wound from the slot layer 141 to the slot bottom layer 142 (28 slots (8) layer-19 slots (1) layer), spanning a total of 16 slot layers 140; and the winding of the branch 240 in the II phase belt is firstly wound from the slot bottom layer 141 to the slot bottom layer 142 (11 slots (8) layer-2 slots (1) layer). The branch 240 is wound in phase III from the slot layer 141 to the slot bottom layer 142 (29 slots (1) layer - 38 slots (8) layer), and a total of 16 slot layers 140 are crossed. The branch 240 is wound in phase III from the slot layer 141 to the slot bottom layer 142 (12 slots (1) layer - 21 slots (8) layer), and then from the slot layer 141 to the slot bottom layer 142 (48 slots (8) layer - 39 slots (1) layer), and a total of 16 slot layers 140 are crossed. The path lengths of the branch 240 in the three phase bands are also the same. Therefore, the branch 240 eliminates the angle difference of the electrical signal that may be caused by the difference in the phase bands.

[0098] Fig.12 and Fig.13 The winding routes of the other two branches 240 are shown respectively. Fig.12 The branch 240 shown enters the stator core 100 from the II phase belt and is led out from the I phase belt. The branch 240 passes through 47 slot (1) layer-2 slot (2) layer-11 (3) layer-20 slot (4) layer-29 slot (5) layer-38 slot (6) layer-47 slot (7) layer-2 slot (8) layer-12 slot (8) layer-3 slot (7) layer-48 slot (6) layer-39 slot (5) layer-30 slot (4) layer-21 slot (3) layer-12 slot (2) layer-3 slot (1) layer-10 slot (1) layer-19 slot (2) layer-28 slot (3) layer-37 slot (4) layer-46 slot (5) layer-1 slot (6) layer-10 slot (7) layer-19 slot (8 ) layer - 29 slot (8) layer - slot 20 (7) layer - slot 11 (6) layer - 2 slot (5) layer - 47 slot (4) layer - 38 slot (3) layer - 29 slot (2) layer - 20 slot (1) layer - 30 slot (1) layer - 39 slot (2) layer - 48 slot (3) layer - 3 slot (4) layer - 12 slot (5) layer - 21 slot (6) layer - 30 slot (7) layer - 39 slot (8) layer - 46 slot (8) layer - 37 slot (7) layer - 28 slot (6) layer - 19 slot (5) layer - 10 slot (4) layer - 1 slot (3) layer - 46 slot (2) layer - 37 slot (1) layer.

[0099] As you can see, Fig.12The branch line 240 shown is wound around each adjacent stator slot group 150 and is also wound between two adjacent wire slot layers 140 along the radial direction of the stator core 100. The bent ends 252 and the welded ends 254 thereof are also in an alternating form, and the span of the U-shaped line 250 and the span of the welded ends 254 are both full-length 9; Fig.12 The number of I-phase belts, the number of II-phase belts and the number of III-phase belts connected to the branch 240 are all 2, and the path lengths of the three phase belts are the same, eliminating the difference in the electrical signal angle.

[0100] Fig.13 The branch 240 shown enters the stator core 100 from the phase III belt and is led out from the phase II belt. The branch 240 passes through 48 slot (1) layer-3 slot (2) layer-12 (3) layer-21 slot (4) layer-30 slot (5) layer-39 slot (6) layer-48 slot (7) layer-3 slot (8) layer-10 slot (8) layer-1 slot (7) layer-46 slot (6) layer-37 slot (5) layer-28 slot (4) layer-19 slot (3) layer-10 slot (2) layer-1 slot (1) layer-11 slot (1) layer-20 slot (2) layer-29 slot (3) layer-38 slot (4) layer-47 slot (5) layer-2 slot (6) layer-11 slot (7) layer-20 slot (8 ) layer - 30 slot (8) layer - slot 21 (7) layer - slot 12 (6) layer - 3 slot (5) layer - 48 slot (4) layer - 39 slot (3) layer - 30 slot (2) layer - 21 slot (1) layer - 28 slot (1) layer - 37 slot (2) layer - 46 slot (3) layer - 1 slot (4) layer - 10 slot (5) layer - 19 slot (6) layer - 28 slot (7) layer - 37 slot (8) layer - 47 slot (8) layer - 38 slot (7) layer - 29 slot (6) layer - 20 slot (5) layer - 11 slot (4) layer - 2 slot (3) layer - 47 slot (2) layer - 38 slot (1) layer.

[0101] As you can see, Fig.13 The branch line 240 shown is wound around each adjacent stator slot group 150 and is also wound between two adjacent wire slot layers 140 along the radial direction of the stator core 100. The bent ends 252 and the welded ends 254 thereof are also in an alternating form, and the span of the U-shaped line 250 and the span of the welded ends 254 are both full-length 9; Fig.13 The number of I-phase belts, the number of II-phase belts and the number of III-phase belts connected to the branch 240 are all 2, and the path lengths of the three phase belts are the same, eliminating the difference in the electrical signal angle.

[0102] Therefore, see Fig.14As shown, it is an overall schematic diagram of the three branches 240 of the U-phase winding 210 wound in each stator slot group 150. For the convenience of description, in the drawings of the present application specification, the slots 133 wound with the same branch 240 are distinguished by labels such as "U1", "U2", and "U3". In the subsequent embodiments of six branches 240 connected in parallel, each branch 240 is distinguished by "U1-U6", and in the embodiments of two branches 240 connected in parallel, the two branches are respectively marked as "U1" and "U2". Fig.14 In the illustrated structure, the three branches 240 are wound in the same manner in each stator slot group 150, forming an effect of being parallel to each other and bridging between two adjacent stator slot groups 150, and parallel to bridging between two adjacent wire slot layers 140. And because the three branches 240 are alternately bridged by the bent ends 252 and the welded ends 254, any two adjacent wire slot layers 140 are bridged by the bent ends 252 of the same shape and the same span, or by the bent ends 254 of the same span and the same twist angle.

[0103] Specifically, in this embodiment, the bent ends 252 are used to achieve bridging between 2 / 3 slot layers 140, between 4 / 5 slot layers 140, and between 6 / 7 slot layers. Among them, because the radius size of each slot 133 on the second slot layer 140 is the same, and the radius size of each slot 133 on the third slot layer 140 is also the same, the bent ends 252 of the same shape and the same span can be used for bridging between 2 / 3 slot layers 140. The structures between 4 / 5 slot layers 140 and between 6 / 7 slot layers 140 are similar, and the U-phase winding 210 can also be bridged between 4 / 5 slot layers 140 and between 6 / 7 slot layers 140 using the bent ends 252 of the same shape and the same span. Therefore, in the motor stator 300 of the present application, when the U-phase winding 210 realizes the bridging between each two adjacent wire slot layers 140, only three types of U-shaped wires 250 with different external structures are needed, and the types of U-shaped wires 250 are relatively small, thereby controlling the manufacturing cost of the U-shaped wires 250.

[0104] In the present application, the remaining slot layers 140 of the motor stator 100 are bridged by welding ends 254. In the diagram, the welding ends 254 are bridged between the 1 / 2 slot layers 140, between the 3 / 4 slot layers 140, between the 5 / 6 slot layers 140, and between the 7 / 8 slot layers 140. Similar to the structure of the above-mentioned bent ends 252, because the radius size of each slot 133 on the first slot layer 140 is the same, and the radius size of each slot 133 on the second slot layer 140 is also the same, the welding ends 254 with the same twist angle and the same span can be used for bridging between the 1 / 2 slot layers 140. Similarly, the welding ends 254 with the same twist angle and the same span can also be used for bridging between the 3 / 4 slot layers 140, between the 5 / 6 slot layers 140, and between the 7 / 8 slot layers 140. In the motor stator 300 of the present application, when the U-phase winding 210 realizes the bridging between two adjacent wire slot layers 140, the external structure of its welding end 254 also only includes four types, which correspondingly simplifies the welding process between the U-shaped wires 250, is beneficial to control the electrical interference at the welding point, and can also control the manufacturing cost of the U-shaped wire.

[0105] Combination Figure 8 The phase diagram of the three-phase winding in each wire slot 133 of the stator core 100 is shown. Because the U-phase winding 210 and the V-phase winding 220 and the W-phase winding 230 are alternately wound in different stator slot groups 150, for the other two-phase windings in the winding 200, they can also adopt a winding method similar to the U-phase winding 210 in their corresponding six stator slot groups 150, and make their respective three branches 240 also connected by U-shaped wires 250 of three kinds of external structures and welding ends 254 of four kinds of external structures, thereby realizing the winding of the two-phase winding in the stator core 100 respectively.

[0106] Through the above-mentioned arrangement, the winding 200 in the motor stator 300 of the present application, when the three-phase winding is bridged between any two adjacent slot layers 140, can realize that the two adjacent slot layers 140 are bridged through the bent end 252 of the U-shaped wire 250, or the bridge is completed through the welding end 254 between the two U-shaped wires 250. And the U-shaped wire 250 bridged between the same two adjacent slot layers 140, its bent end 252 has the same shape and equal span; the welding end 254 bridged between the same two adjacent slot layers 140, its span and twist angle are equal. Such an arrangement makes the number of U-shaped wires 250 in the entire motor stator 300 relatively small, which can control the manufacturing cost of the U-shaped wire 250; it can also make the external structure of the welding end 254 in the entire motor stator 300 relatively reduced, simplify the welding process of the winding 200, and further reduce the manufacturing cost of the motor stator 300.

[0107] It is understandable that for the motor 400 using the motor stator 300 of the present application, and the vehicle using the motor 400 of the present application, because the cost of the motor stator 300 is controlled, the cost of the motor 400 and the vehicle is also controlled accordingly. On the other hand, inside each parallel branch 240 of each phase winding, because it is respectively connected in series with the I phase belt, the II phase belt and the III phase belt with equal path length, the angle difference of the electrical signal in each parallel branch 240 is eliminated, which can reduce the circulating current effect that may be generated during the operation of the motor 400, thereby making the working characteristics of the motor stator 300 in the motor 400 more stable, ensuring the reliable operation of the motor 400 and the vehicle.

[0108] The above embodiments are based on the number of parallel branches 240 in each phase winding being 3. However, for the motor stator 300 of the present application, when the above winding method is adopted, the number of parallel branches 240 is not limited to 3, and can also be other values. For example, see Fig.15 The figure shows a winding method in which the number of parallel branches 240 is 6. For the convenience of description, Fig.15 Only the winding structure of the U-phase winding 210 is shown. Specifically, the U-phase winding 210 includes six branches 240, which enter the stator core 100 from two adjacent different stator slot groups 150 (37-39 slots, 46-48 slots) and lead out of the stator core 100 from two adjacent different stator slot groups 150 (19-21 slots, 28-30 slots).

[0109] Taking one of the branches 240 as an example, the branch 240 enters from the 46th slot (1) layer and exits from the 21st slot (8) layer. The branch 240 passes through the 46th slot (1) layer-1st slot (2) layer-10th slot (3) layer-19th slot (4) layer-28th slot (5) layer-37th slot (6) layer-46th slot (7) layer-1st slot (8) layer-11th slot (8) layer-2nd slot (7) layer-47th slot (6) layer-38th slot (5) layer-29th slot (4) layer-20th slot (3) layer-11th slot (2) layer-2nd slot (1) layer-12th slot (1) layer-21st slot (2) layer-30th slot (3) layer-39th slot (4) layer-48th slot (5) layer-3rd slot (6) layer-12th slot (7) layer-21st slot (8) layer in sequence.

[0110] Among them, when the branch 240 is at 46 slots (1) layers-1 slot (8) layers, it is located in the I phase belt, and when it is at 11 slots (8) layers-2 slots (1) layers, it is located in the II phase belt, and finally when it is at 12 slots (1) layers-21 slots (8) layers, it is located in the III phase belt. At the slot mouth layer 141 (8 layers), the branch 240 realizes the same-layer belt switching from the I phase belt to the II phase belt through the 1 slot (8) layer-11 slot (8) layer, and at the slot bottom layer 142 (1 layer), it realizes the same-layer belt switching from the II phase belt to the III phase belt through the 2 slots (1) layers-12 slots (1) layers. The path lengths of the various phase belts in the branch 240 are also the same.

[0111] The two branches 240 wound on the same stator slot group 150 as the branch 240 respectively enter from the 47th slot (1) layer and exit from the 19th slot (8) layer, and enter from the 48th slot (1) layer and exit from the 20th slot (8) layer. They also respectively implement a same-layer belt change at the slot opening layer 141 and the slot bottom layer 142, and respectively form a series connection of three different phase belts, and the path lengths of each phase belt are the same.

[0112] In the three branches 240 located in another stator slot group 150, the wires are respectively fed in from the 28th slot (8) layer and discharged from the 39th slot (1) layer, fed in from the 29th slot (8) layer and discharged from the 37th slot (1) layer, and fed in from the 30th slot (8) layer and discharged from the 38th slot (1) layer. The three branches 240 also implement a same-layer belt change at the slot opening layer 141 and the slot bottom layer 142, respectively, and form a series connection of three different phase belts, and the path lengths of each phase belt are the same.

[0113] exist Fig.15 In the embodiment, any two adjacent wire slot layers 140 can also be bridged by using bent ends 252 of the same shape and equal span, or by using welded ends 254 with equal span and equal twist angle. That is, the U-shaped wires 250 used in the winding 200 in this embodiment are also of three types, and the outer shapes of the welded ends 254 are also of four types, which can achieve similar beneficial effects as the above-mentioned embodiments.

[0114] Fig.16 The figure shows the winding method of 2 in parallel. For the convenience of expression, Fig.16 Only the winding structure of the U-phase winding 210 is shown. Specifically, the U-phase winding 210 includes two branches 240, which enter the stator core 100 from different stator slots 130 and different slot layers 140, respectively, and in any slot layer 140 of any stator slot group 150, a U-shaped wire 250 of the two branches 240 is wound at the same time. Finally, the two branches 240 are led out of the stator core 100 from different stator slots 130 and different slot layers 140, respectively.

[0115] Specifically, one of the two branches 240 enters from the 46th slot (1) layer and exits from the 20th slot (8) layer. The branch 240 passes through the 46th slot (1) layer-1st slot (2) layer-10th slot (3) layer-19th slot (4) layer-28th slot (5) layer-37th slot (6) layer-46th slot (7) layer-1st slot (8) layer-11th slot (8) layer-2nd slot (7) layer-47th slot (6) layer-38th slot (5) layer-29th slot (4) layer-20th slot ( 3) Layer - 11 Slot (2) Layer - 2 Slot (1) Layer - 12 Slot (1) Layer - 21 Slot (2) Layer - 30 Slot (3) Layer - 39 Slot (4) Layer - 48 Slot (5) Layer - 3 Slot (6) Layer - 12 Slot (7) Layer - 21 Slot (8) Layer - 28 Slot (8) Layer - Slot 19 (7) Layer - Slot 10 (6) Layer - 1 Slot (5) Layer - 46 Slot (4) Layer - 37 Slot (3) Layer - 28 Slot (2) Layer - 19 Slot (1) Layer - 29 Slot (1) -38 slot (2) layer -47 slot (3) layer -2 slot (4) layer -11 slot (5) layer -20 slot (6) layer -29 slot (7) layer -38 slot (8) layer -48 slot (8) layer -39 slot (7) layer -30 slot (6) layer -21 slot (5) layer -12 slot (4) layer -3 slot (3) layer -48 slot (2) layer -39 slot (1) layer -48 slot (1) layer -3 slot (2) layer -12 slot (3) layer -21 slot (4) layer -30 slot (5) layer - 39 slots (6) layer - 48 slots (7) layer - 3 slots (8) layer - 10 slots (8) layer - 1 slot (7) layer - 46 slots (6) layer - 37 slots (5) layer - 28 slots (4) layer - 19 slots (3) layer - S10 slots (2) layer - 1 slot (1) layer - 11 slots (1) layer - 20 slots (2) layer - 29 slots (3) layer - 38 slots (4) layer - 47 slots (5) layer - 2 slots (6) layer - 11 slots (7) layer - 20 slots (8) layer.

[0116] The branch 240 is connected in series successively with phase I belt-phase II belt-phase III belt-phase I belt-phase II belt-phase III belt-phase III belt-phase I belt-phase II belt, that is, three phase I belts, three phase II belts and three phase III belts are connected in series successively. The path lengths of the connected phase belts are the same.

[0117] Another branch 240 enters from the 30th slot (8) layer and exits from the 37th slot (2) layer. It is connected in series with phase III belt-phase I belt-phase II belt-phase II belt-phase III belt-phase I belt-phase II belt-phase III belt-phase I belt, and is also connected in series with three phase I belts, three phase II belts and three phase III belts. The path lengths of the phase belts connected are also the same.

[0118] At the same time, the two branches 240 also form a form of alternately bridging the bent ends 252 and the welding ends 254, and between any two adjacent wire slot layers 140, the bent ends 252 with the same shape and equal span are used to form a bridging, or the welding ends 254 with equal span and equal twist angle are used to form a bridging. Therefore, the types of U-shaped wires 250 used in the winding 200 in this embodiment are also three, and the external shapes of the welding ends 254 are also four, which can achieve similar beneficial effects as the above-mentioned embodiments.

[0119] Please also see Fig.14 , Fig.15 and Fig.16 . The slot changing of each branch 240 in the slot opening layer 141 and the slot bottom layer 142 can be achieved by setting a slot changing section 260 in each phase winding. Specifically, the slot changing section 260 is located in the slot opening layer 141 and the slot bottom layer 142, and is used to achieve electrical conduction between two adjacent stator slot groups 150, and the phase belt exchange function between the two stator slot groups 150. The slot changing section 260 includes a first passage 261, a second passage 262 and a third passage 263, and the three passages are connected between two adjacent stator slot groups 150 through different span combinations. Each passage is connected between two different stator slots 130. It can be understood that the two different stator slots 130 are respectively located in two adjacent stator slot groups 150. And the phase belts of the two stator slots 130 connected by the same passage are different.

[0120] For example, in Figure 14-16 In the embodiment of the present invention, the slot changing sections 260 with the same span combination are used. The spans of the first passage 261 and the second passage 262 are both 10, and the span of the third passage 263 is 7. Fig.14 Taking two adjacent stator slot groups 150 (1-3 slots, 10-12 slots) as an example, in the slot bottom layer 142, the second passage 262 is connected between the 1 slot (1) layer and the 11 slot (1) layer, with a span of 10 long distances, thereby realizing the slot change between the I phase belt and the II phase belt; the second passage 262 is connected between the 2 slot (1) layer and the 12 slot (1) layer, with a span of 10 long distances, thereby realizing the slot change between the II phase belt and the III phase belt; the third passage 263 is connected between the 3 slot (1) layer and the 10 slot (1) layer, with a span of 10 long distances, thereby realizing the slot change between the III phase belt and the I phase belt.

[0121] In the slot layer 141 of the two adjacent stator slot groups 150, the first passage 261 is connected between the 1st slot (8) layer and the 11th slot (8) layer, with a span of 10 long distances, thereby realizing the slot change between the I phase belt and the II phase belt; the second passage 262 is connected between the 2nd slot (8) layer and the 12th slot (8) layer, with a span of 10 long distances, thereby realizing the slot change between the II phase belt and the III phase belt; the third passage 263 is connected between the 3rd slot (8) layer and the 10th slot (8) layer, with a span of 10 long distances, thereby realizing the slot change between the III phase belt and the I phase belt.

[0122] exist Fig.14 In the diagram, the U-phase winding 210 is composed of three parallel branches 240, each branch 240 has six phase belts in series, and a total of five same-layer belt changes are required. Fig.14 In the embodiment of the U-phase winding 210, five slot-changing sections 260 are respectively used to realize five same-layer belt-changing actions of the three branches 240; Fig.15 In the diagram, the U-phase winding 210 is composed of six parallel branches 240, each branch 240 is connected in series with three phase belts, and each branch 240 needs to perform two same-layer belt changes. Fig.15 In the embodiment of the present invention, the U-phase winding 210 includes four slot-changing sections 260, which are respectively used to realize two same-layer belt-changing actions of the six branches 240; Fig.16 In the schematic diagram, the U-phase winding 210 is composed of two parallel branches 240, each branch 240 has nine phase belts connected in series, and a total of 8 same-layer belt changes are required. Therefore, Fig.14 In the embodiment of the present invention, the U-phase winding 210 includes four slot-changing sections 260, which are respectively used to realize six same-layer tape-changing actions of the two branches 240. The other two same-layer tape-changing actions of the two branches 240 are between two adjacent stator slot groups 150 from which the lines are respectively fed in and led out.

[0123] Fig.17 Another span combination form of the slot changing section 260 is shown. Fig.17 In the diagram, the span of the first passage 261 is a long distance of 11, and the spans of the second passage 262 and the third passage 263 are both 8. Similarly, taking two adjacent stator slot groups 150 (1-3 slots, 10-12 slots) as an example, in the slot bottom layer 142, the first passage 261 is connected between the 1st slot (1) layer and the 12th slot (1) layer, and the span is a long distance of 11, thereby realizing the slot change between the I phase belt and the III phase belt; the second passage 262 is connected between the 2nd slot (1) layer and the 10th slot (1) layer, and the span is a short distance of 8, thereby realizing the slot change between the II phase belt and the I phase belt; the third passage 263 is connected between the 3rd slot (1) layer and the 11th slot (1) layer, and the span is a short distance of 8, thereby realizing the slot change between the III phase belt and the II phase belt.

[0124] In the slot layer 141 of the two adjacent stator slot groups 150, the first passage 261 is connected between the 1st slot (8) layer and the 12th slot (8) layer, with a long span of 11, thereby realizing the slot change between the I phase belt and the III phase belt; the second passage 262 is connected between the 2nd slot (8) layer and the 10th slot (8) layer, with a short span of 8, thereby realizing the slot change between the II phase belt and the I phase belt; the third passage 263 is connected between the 3rd slot (8) layer and the 11th slot (8) layer, with a short span of 8, thereby realizing the slot change between the III phase belt and the II phase belt.

[0125] Fig.17 An embodiment of three branches 240 connected in parallel is illustrated. It is understandable that for the embodiments of six branches 240 and two branches 240 connected in parallel, the same span combination of the slot changing section 260 can also be used to achieve the same-layer belt changing action in each branch 240.

[0126] For the motor stator 300 of the present application, when the slot-changing section 260 is used to realize the action of changing the belt on the same layer, the span combination between the two adjacent stator slot groups 150 is the same. In some embodiments, the slot-changing section 260 with the same span combination can also be used between the slot opening layer 141 and the slot bottom layer 142 to respectively realize similar same-layer belt-changing actions. For the slot-changing section 260 located in the slot opening layer 141, because its span combination is fixed, the types of U-shaped wires 250 in each passage in the slot-changing section 260 are also controlled, thereby reducing the number of types of U-shaped wires 250 at the slot opening layer 141, and the number of types of U-shaped wires 250 used in the motor stator 300 can be further reduced; and for the slot-changing section 260 located in the slot bottom layer 142, because the span combination is fixed, the number of types of U-shaped wires 250 is reduced, thereby controlling the number of types of U-shaped wires 250 used in the motor stator 300. At the same time, when the span combination of the slot changing section 260 is certain, the welding process of each welding end 254 thereof is relatively simplified. Therefore, the arrangement of the slot changing section 260 in the above embodiment can further control the manufacturing cost of the motor stator 300 .

[0127] Combination Figure 14-17 It can be seen from the schematic diagrams of the winding methods of various windings 200 shown that in the motor stator 300 of the present application, due to the different numbers of parallel branches, there are differences in the incoming and outgoing positions on the slot layer 141 and the slot bottom layer 142 in various embodiments, and the connection position of the slot changing section 260 is also different. However, among the remaining slot layers 140 except the slot layer 141 and the slot bottom layer 142, the actual winding method, span, and alternating arrangement of the bent end 252 and the welding end 254 of the U-shaped wire 250 are the same. This also achieves the control of the types of U-shaped wires 250 and the types of welding ends 254, thereby controlling the overall manufacturing cost of the motor stator 300.

[0128] Fig.18 Indicates the corresponding Figure 14-17 In each embodiment, the U-phase winding 210 is wound in the 2nd to 7th slot layers 140 . Fig.19 and Fig. 20 They correspond to the specific structures of the slot opening layer 141 and the slot bottom layer 142 of the U-phase winding 210 respectively. Fig.19 In the schematic diagram of FIG. 1 , three slot-changing segments 260 are respectively wound in 6 different stator slot groups 150 and are located at the same slot layer 141 . Fig. 20 In the diagram, two slot-changing sections 260 are respectively wound in four different stator slot groups 150 , and the remaining two stator slot groups 150 are respectively used to insert the incoming wire ends 241 and the outgoing wire ends 242 of the three branches 240 .

[0129] Fig.21 , Fig. 22 ,as well as Fig.23 The specific structure of the three-phase winding being wound in the second to seventh slot layers 140 at the same time and the specific structure of the three-phase winding being located in the slot opening layer 141 and the slot bottom layer 142 at the same time are respectively illustrated. Figure 18-Figure 20 As shown in the structure diagram, when the three-phase windings are wound in the 2nd to 7th wire slot layers 140 at the same time, any two adjacent wire slot layers 140 are also formed to be bridged by using the bending ends 252 of the same shape and equal span, or by using the welding ends 254 of equal span and equal twist angle. Fig. 22 and Fig.23 The arrangement of each slot-changing section 260 and the arrangement of the line-in terminal 241 and the line-out terminal 242 form a winding method of three parallel branches 240 .

[0130] Understandably, Fig.21 The specific structure shown is also applicable to Figure 15-17 In the specific structure of each embodiment, in conjunction with the arrangement of the slot changing section 260, and the arrangement of the inlet end 241 and the outlet end 242, six parallel branches 240, two parallel branches 240 and other different winding methods are formed respectively. That is, for the motor stator 300 of the present application, in the process of winding the winding 200, the winding process of each U-shaped wire 250 in the remaining intermediate line slot layer 140 (the 2nd to 7th line slot layer 140 in this embodiment) except the notch layer 141 and the slot bottom layer 142 can be completed first, and then based on different usage scenarios and electrical parameters, the winding process of the notch layer 141 and the slot bottom layer 142 is completed, and the number of parallel branches of the motor stator 300 of the present application is finally determined. The manufacturing method of the intermediate line slot layer 140 that completes the winding process in advance makes the number of series turns and the number of parallel branches of the motor stator 300 of the present application more flexible, and also broadens the scope of application of the motor stator 300 of the present application.

[0131] In the above-mentioned embodiments, the inlet end 241 and the outlet end 242 of each branch 240 are both arranged on the side close to the bent end 252. After entering the stator core 100, the inlet end 241 and the outlet end 242 are first connected to a U-shaped wire 250 through the welding end 254, and then bridged to another wire slot layer 140 through the U-shaped wire 250. However, the winding method of the motor stator 300 of the present application does not specifically limit the positions of the inlet end 241 and the outlet end 242, and the inlet end 241 and the outlet end 242 can also enter the stator core 100 from the side close to the welding end 254. Fig.24 As shown, the three branches 240 of the U-phase winding 210 all enter the stator core 100 from the same stator slot group 150 (slots 37-39), and the three wire entry ends 241 are all located near the welding end 254, and are respectively welded and connected with the three U-shaped wires 250 in the stator slot group 150 in the form of welding wires. The three U-shaped wires 250 are all used as three passages in the same slot change section 260 in the slot bottom layer 142. Therefore, after the three branches 240 of the U-phase winding 210 enter the stator core 100 near the welding end 254, they first complete a same-layer tape change (to slots 46-48), and then are wound in six different stator slot groups 150 in sequence.

[0132] Exemplarily, one of the branches 240 passes through 39 slot (1) layers - 46 slot (1) layers - 1 slot (2) layer - 10 (3) layer - 19 slot (4) layer - 28 slot (5) layer - 37 slot (6) layer - 46 slot (7) layer - 1 slot (8) layer - 11 slot (8) layer - 2 slot (7) layer - 47 slot (6) layer - 38 slot (5) layer - 29 slot (4) layer - 20 slot (3) layer - 11 slot (2) layer - 2 slot (1) layer - 12 slot (1) layer - 21 slot (2) layer - 30 slot (3) layer - 39 slot (4) layer - 48 slot (5) layer - 3 slot (6) layer - 12 slot (7) layer - 21 slot (8) layer - 28 slot (8) layer - slot 19 (7) layer - slot 10 (6) layer - 1 slot (5) layer - 46 slot (4) layer - 37 slot (3) layer - 28 slot (2) layer - 19 slot (1) layer - 29 slot (1) layer - 38 slot (2) layer - 47 slot (3) layer - 2 slot (4) layer - 11 slot (5) layer - 20 slot (6) layer - 29 slot (7) layer - 38 slot (8) layer - 48 slot (8) layer - 39 slot (7) layer - 30 slot (6) layer - 21 slot (5) layer - 12 slot (4) layer - 3 slot (3) layer - 48 slot (2) layer.

[0133] That is, in this embodiment, because the incoming line terminal 241 enters from the side close to the welding end 254, the outgoing line terminal 242 also needs to be led out from the side close to the welding end 254. Therefore, the final outgoing line terminal 242 is led out from the 48-slot (2) layer, and in the stator slot group 150 where the 48-slot is located, its slot bottom layer 142 enters the stator core 100 as three branches 240, and then completes a same-layer tape change position through the slot changing section 260. The U-phase winding 210 is also wound in the six stator slot groups 150, and passes through each wire slot 133 in the stator slot group 150, ensuring the copper full rate of the motor stator 300. Furthermore, through Fig.24 It can be seen from the example that under this winding method, the two wire slot layers 140 of the line are also bridged by the bent ends 252 of the same shape and the same span, or by the welding ends 254 of the same span and the same twist angle, which can also achieve beneficial effects similar to the above embodiments.

[0134] It should be pointed out that the position of the motor stator 300 in the slot bottom layer 142 and the slot mouth layer 141 of the present application can form a variety of combinations of series turns and parallel branches through the combination of different slot changing sections 260 and the input terminal 241 and the output terminal 242. At the same time, the wiring method of the motor stator 300 of the present application can also be arbitrarily selected according to the working environment and electrical parameters. Fig.25 and Fig.26 The following diagrams illustrate the connection modes of the three-phase windings using star connection and delta connection when the number of parallel branches is six. Fig. 27 and Fig.28 The following diagrams illustrate the connection modes of the three-phase windings using star connection and delta connection when there are three parallel branches. Fig.29 and Fig.30 The three-phase windings are respectively shown to be connected in star connection and triangle connection when the number of parallel branches is two. Because the series-parallel connection of each branch is completed at the slot layer 141 and the slot bottom layer 142 in the winding 200 of the present application, the motor stator 300 of the present application also simplifies the wiring process, and the wiring method can be arbitrarily set based on the actual working environment and electrical parameters.

[0135] The above embodiments are all developed around the number of wire slot layers 140 being 8, and there are six intermediate wire slot layers 140 excluding the slot opening layer 141 and the slot bottom layer 142, but the motor stator 300 of the present application does not strictly limit the number of wire slot layers 140, and the wire slot layers 140 can also be 3 or any other value greater than 3. For example, the number of wire slot layers 140 is 7, 10, or 12, and the winding 200 can be arranged in the above winding manner, thereby reducing the types of U-shaped wires 250 and controlling the manufacturing cost of the motor stator 300.

[0136] Fig.31That is, it shows the winding route of the U-phase winding 210 in each slot layer 140 when the number of slot layers 140 is 7. In this embodiment, the U-phase winding 210 is wound in the form of three parallel branches 240. One of the branches 240 enters from the 46th slot (1) layer and exits from the 39th slot (1) layer. The branch 240 passes through 46 slot (1) layer - 1 slot (2) layer - 10 (3) layer - 19 slot (4) layer - 28 slot (5) layer - 37 slot (6) layer - 46 slot (7) layer - 2 slot (7) layer - 47 slot (6) layer - 38 slot (5) layer - 29 slot (4) layer - 20 slot (3) layer - 11 slot (2) layer - 2 slot (1) layer - 12 slot (1) layer - 21 slot (2) layer - 30 slot (3) layer - 39 slot (4) layer - 48 slot (5) layer - 3 slot (6) layer - 12 slot ( 7) layer - slot 19 (7) layer - slot 10 (6) layer - 1 slot (5) layer - 46 slot (4) layer - 37 slot (3) layer - 28 slot (2) layer - 19 slot (1) layer - 29 slot (1) layer - 38 slot (2) layer - 47 slot (3) layer - 2 slot (4) layer - 11 slot (5) layer - 20 slot (6) layer - 29 slot (7) layer - 39 slot (7) layer - 30 slot (6) layer - 21 slot (5) layer - 12 slot (4) layer - 3 slot (3) layer - 48 slot (2) layer - 39 slot (1) layer.

[0137] It can be seen that in this embodiment, because the number of line slot layers 140 is an odd number, three different types of U-shaped wires 250 are respectively connected between the 2 / 3 line slot layer 140, the 4 / 5 line slot layer 140, and the 6 / 7 line slot layer 140. The 7th line slot layer 140 also serves as the notch layer 141 in the embodiment of the present application. Therefore, the structure for realizing the same-layer tape change at the notch layer 141 needs to be a structure of a welding end 254. And at the position of the bottom slot layer 142, the structure for realizing the same-layer tape change is a structure of a bending end 252. And because this embodiment also adopts the method of a slot changing section 260 for the same-layer tape change, in this embodiment, the slot changing section 260 for realizing the same-layer tape change located in the bottom slot layer 142 can have three passages respectively constituted by U-shaped wires 250; and the slot changing section 260 for realizing the same-layer tape change located in the notch layer 141 can have three passages respectively constituted by welding ends 254.

[0138] On the contrary, when three different types of U-shaped wires 250 are respectively connected between the 1 / 2 line slot layer 140, the 3 / 4 line slot layer 140, and the 5 / 6 line slot layer 140, the embodiment of the present application needs to complete the same-layer belt change in the slot bottom layer 142 through the welding end 254; and complete the same-layer belt change in the slot mouth layer 141 through the U-shaped wire 250. Or described as, when the number of line slot layers 140 is an odd number, each branch 240 is connected between different stator slots 130 in the slot mouth layer 141 through the bending end 250 of the U-shaped wire 250, and is connected between different stator slots 130 in the slot bottom layer 142 through the welding end 254; or the branch 240 is connected between different stator slots 130 in the slot mouth layer 141 through the welding end 254, and is connected between different stator slots 130 in the slot bottom layer 142 through the bending end 252 of the U-shaped wire 250.

[0139] For the embodiment in which the number of the line slot layers 140 is an even number, the U-shaped wire 250 can be used to realize the same-layer tape change in the slot opening layer 141 and the slot bottom layer 142. Because the span combination of each slot change section 260 is fixed, the U-shaped wire 250 is used to construct the slot change section 260, which not only ensures the stability of electrical parameters, but also controls the number of types of the U-shaped wire 250.

[0140] In one embodiment, the slot opening layer 141 and the slot bottom layer 142 can also realize the same-layer belt changing by means of slot changing lines. The three stator slots 130 in the same stator slot group 150 are respectively bridged to different stator slot groups 150 through slot changing lines, and the function of the same-layer belt changing can also be realized. Specifically, a first slot changing line 271 is provided in the slot opening layer 141, and a second slot changing line 272 is provided in the slot bottom layer 142. The first slot changing line 271 is bridged in a stator slot group 150 of the slot opening layer 141, respectively, toward the two adjacent stator slot groups 150 in front and behind the stator slot group 150, and realizes the same-layer belt changing function; the second slot changing line 272 is bridged in a stator slot group 150 of the slot bottom layer 142, respectively, toward the two adjacent stator slot groups 150 in front and behind the stator slot group 150, to realize the same-layer belt changing function. The first slot-changing line 271 and the second slot-changing line 272 cooperate to achieve the phase belt switching action of each parallel branch in the same-phase winding.

[0141] For details, please see Fig.32 As shown, the winding of six parallel branches 240 in the 8-layer wire slot layer 140 is schematically shown. And for the convenience of description, Fig.32 The structure of some intermediate wire slot layers 140 (layers 3-6) is omitted, and only the structures of the first (bottom slot layer 142), 2, 7, and 8 (notch layer 141) are shown. Fig.32In the schematic diagram shown, six parallel branches 240 enter the stator core 100 from different stator slot groups 150, and then are led out from different stator slot groups 150. Specifically, one of the branches 240 enters the stator core 100 from the 47 slot (1) layer, and is located in the II phase belt when entering the stator core 100, and is wound to the 2 slot (8) layer in sequence, and arrives at the slot opening layer 141. Then, the branch 240 is bridged from the 2 slot (8) layer to the 12 slot (8) layer through the first slot change line 271, with a span of long distance 10, thereby realizing the same-layer belt change from the II phase belt to the III phase belt. Subsequently, the branch 240 is then circled to the 3 slot (1) layer in sequence, arrives at the slot bottom layer 142, and is bridged from the 3 slot (1) layer to the 10 slot (1) layer through the second slot change line 272, with a span of short distance 7, thereby realizing the same-layer belt change from the III phase belt to the I phase belt. Thus, the branch 240, with the cooperation of the first slot-changing line 271 and the second slot-changing line 272, completes the series connection of the three phase belts in sequence, and finally leads out from the 19-slot (8) layer.

[0142] As for the belt changing action of the branch 240 at the slot layer 141, it jumps from the 2 slot (8) layer to the 12 slot (8) layer, which can be understood as the first slot changing line 271 jumping from the stator slot group 150 (1-3 slots) where the 2 slot is located to the stator slot group 150 (10-12 slots) where the 12 slot is located. At the same time, the first slot changing line 271 also jumps from the stator slot group 150 (1-3 slots) where the 2 slot is located to the stator slot group 150 (46-48 slots) where the 47 slot is located. That is, the first slot changing line 271 jumps toward the two adjacent stator slot groups 150 (10-12 slots and 46-48 slots) in front and behind the stator slot group 150, and respectively realizes the same-layer belt changing function. In this embodiment, the span of the first slot changing line 271 is 10, which is used to realize the belt changing action of each branch 240 from the II phase belt to the III phase belt.

[0143] The belt changing action at the slot bottom layer 142 of the branch 240 is bridged from the 3-slot (1) layer to the 10-slot (1) layer, which can be understood as the second slot changing line 272 bridges from the stator slot group 150 (1-3 slots) where the 3-slot is located to the stator slot group 150 (10-12 slots) where the 10-slot is located. At the same time, the second slot changing line 272 also bridges from the stator slot group 150 (1-3 slots) where the 3-slot is located to the stator slot group 150 (46-48 slots) where the 48-slot is located. That is, the second slot changing line 272 bridges toward the two adjacent stator slot groups 150 (10-12 slots and 46-48 slots) in front and behind the stator slot group 150, and respectively realizes the same-layer belt changing function. In this embodiment, the span of the second slot changing line 272 is 7, which is used to realize the belt changing action between the I-phase belt and the III-phase belt of each branch 240.

[0144] Therefore, in Fig.32In the embodiment shown, the cooperation of the first slot-changing wire 271 and the second slot-changing wire 272 realizes the same-layer tape-changing action of each branch 240 in the slot opening layer 141 and the slot bottom layer 142. The span of the first slot-changing wire 271 is the same, and the span of the second slot-changing wire 272 is also the same. For the motor stator 300 with 8 slot layers 140, only five U-shaped wires 250 of different shapes are needed to complete the winding of the entire winding 200 on the stator core 100, and the circulation and the like in the winding 200 can be effectively avoided, thereby ensuring the reliable operation of the motor stator 300. This embodiment can also reduce the manufacturing cost of the motor stator 300.

[0145] For another example, see Fig.33 This embodiment is relative to Fig.32 The embodiment of the invention has the same number of parallel branches, the way of incoming and outgoing lines, etc., except that the spans of the first slot-changing line 271 and the second slot-changing line 272 are swapped, so that the span of the first slot-changing line 271 is a short span of 7, and the span of the second slot-changing line 272 is a long span of 10, which can also achieve the same Fig.32 Similar beneficial effects of the embodiment. In this embodiment, the branch 240 that enters the stator slot group 150 composed of the 46th to 48th slots specifically enters the stator slot group 150 from the 48th slot (1) layer. When it enters the stator core 100, it is located in the III phase belt, and then it is wound to the 3rd slot (8) layer in sequence, and arrives at the slot mouth layer 141. The branch 240 is connected from the 3rd slot (8) layer to the 10th slot (8) layer through the first slot change line 271, with a short span of 7, thereby realizing the same-layer belt change from the III phase belt to the I phase belt. Subsequently, the branch 240 is sequentially wound to the 1st slot (1) layer, arrives at the slot bottom layer 142, and is connected from the 1st slot (1) layer to the 11th slot (1) layer through the second slot change line 272, with a long span of 10, thereby realizing the same-layer belt change from the I phase belt to the II phase belt. Thus, the branch 240, with the cooperation of the first slot-changing line 271 and the second slot-changing line 272, completes the series connection of the three phase belts in sequence, and finally leads out from the 20-slot (8) layer.

[0146] As you can see, Fig.33 In the embodiment of the present invention, the span of the first slot-changing line 271 and the span of the second slot-changing line 272 are respectively the same, which also achieves the effect of reducing the types of U-shaped lines 250 in the motor stator 300.

[0147] For similar winding methods, see Fig.34 and Fig.35 Among them Fig.34 In the winding method, the span of the first slot-changing line 271 is 8, which is used to realize the same-layer switching between the phase II belt and the phase I belt in the slot opening layer 141; the span of the second slot-changing line 272 is 11, which is used to realize the same-layer switching between the phase I belt and the phase III belt in the slot bottom layer 142. Fig.35 In the winding method, the span of the first slot changing line 271 is 11, which is used to realize the same-layer belt changing between the I phase belt and the III phase belt in the slot opening layer 141; the span of the second slot changing line 272 is 8, which is used to realize the same-layer belt changing between the III phase belt and the II phase belt in the slot bottom layer 142.

[0148] As you can see, Fig.34 and Fig.35 In the embodiment of the present invention, the span of the first slot-changing line 271 and the span of the second slot-changing line 272 are respectively the same, which also achieves the effect of reducing the types of U-shaped lines 250 in the motor stator 300.

[0149] See also Fig.36 In the embodiment, when the number of parallel branches in the same-phase winding is three, the same-layer tape changing action in the slot opening layer 141 and the slot bottom layer 142 can also be achieved by the cooperation of the first slot changing line 271 and the second slot changing line 272. Fig.36 In a branch 240 shown, the branch enters the stator core 100 from the 46 slot (1) layer. When entering the stator core 100, it is located in the I phase belt and is wound to the 1 slot (8) layer in sequence, reaching the slot opening layer 141. Then, the branch 240 is connected from the 1 slot (8) layer to the 11 slot (8) layer through the first slot changing line 271, with a span of 10 long distances, thereby realizing the same-layer belt change from the I phase belt to the II phase belt; then, the branch 240 is connected to the 2 slot (1) layer in sequence, reaching the slot bottom layer 142, and is connected to the 12 slot (1) layer through the second slot changing line 272, with a span of 10 long distances, thereby realizing the same-layer belt change from the II phase belt to the III phase belt; then, the branch 240 is connected to the 21 slot (8) layer in sequence, and is connected to the 12 slot (1) layer through the second slot changing line 272, with a span of 10 long distances, thereby realizing the same-layer belt change from the II phase belt to the III phase belt; It is connected to the 30th slot (8) layer through the first slot-changing line 271, with a span of 9, and its phase belt is still in the III phase belt; it then circles around to the 21st slot (1) layer, and is connected to the 11th slot (1) layer through the second slot-changing line 272, with a span of 10, completing the same-layer belt change from the III phase belt to the II phase belt; it circles around to the 20th slot (8) layer, and is connected to the 10th slot (1) layer through the first slot-changing line 271, with a span of 10, completing the same-layer belt change from the II phase belt to the I phase belt, and finally leads out from the 1st slot (1) layer.

[0150] In this embodiment, the span of the second slot-changing line 272 is long 10, and the span of the first slot-changing line 272 includes long 10 and full 9. The branch 240, in cooperation with the first slot-changing line 271 and the second slot-changing line 272, completes the action of connecting the three phase belts in series twice in sequence, and in the process of completing the winding of the three parallel branches 240, the types of U-shaped wires 250 in the motor stator 300 can be controlled to six, which can also play the effect of reducing the manufacturing cost of the motor stator 300.

[0151] Fig.37 The embodiment also illustrates that when there are two parallel branches, the first slot-changing line 271 and the second slot-changing line 272 are used to realize the same-layer belt-changing action in the slot opening layer 141 and the slot bottom layer 142. In this embodiment, there are two types of first slot-changing lines 271, including long-distance 10 and full-distance 9; there are also two types of second slot-changing lines 272, including long-distance 10 and full-distance 9. Among them, the first slot-changing line 271 with a span of long distance 10 can be used to realize the same-layer belt-changing between the II phase belt and the III phase belt, and the second slot-changing line 272 with a span of long distance 10 is used to realize the same-layer belt-changing between the I phase belt and the II phase belt. The first slot-changing line 271 and the second slot-changing line 272 with a span of full distance 9 are used for the slot-changing action between the same phase belts in the same layer. Therefore, through the cooperation of the first slot-changing line 271 and the second slot-changing line 272, the two branches are connected in series with the three phase belts three times in sequence, and the types of U information 250 in the motor stator 300 are controlled to seven, thereby reducing the manufacturing cost of the motor stator 300.

[0152] For an example, see Fig.38 and Fig.39 The spans of the first slot changing line 271 and the second slot changing line 272 can also be set to the same long distance 10 or short distance 8, and cooperate to achieve the same-layer tape changing action in the slot opening layer 141 and the slot bottom layer 142. Fig.38 In the diagram, the first slot-changing line 271 with a span of 10 in the slot layer 141 can be used to realize the same-layer belt-changing action between the I-phase belt and the II-phase belt; the second slot-changing line 272 with a span of 10 in the slot bottom layer 142 is used to realize the same-layer belt-changing action between the II-phase belt and the III-phase belt. With the cooperation of the first slot-changing line 271 and the second slot-changing line 272, each branch 240 completes the series connection of the three phase belts in sequence, and also achieves the effect of reducing the types of U-shaped lines 250 in the motor stator 300.

[0153] And in Fig.39 In the diagram, the first slot-changing line 271 with a short span of 8 in the slot layer 141 can be used to realize the same-layer belt-changing action between the II-phase belt and the III-phase belt; the second slot-changing line 272 with a short span of 8 in the slot bottom layer 142 is used to realize the same-layer belt-changing action between the III-phase belt and the I-phase belt. With the cooperation of the first slot-changing line 271 and the second slot-changing line 272, each branch 240 also completes the series connection of the three phase belts in sequence, and also achieves the effect of reducing the types of U-shaped lines 250 in the motor stator 300.

[0154] The above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, such as reducing or adding structural parts, changing the shape of structural parts, etc., which should be included in the protection scope of the present application; in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A motor stator, It is characterized in that Including stator core and winding; The stator core is cylindrical, and comprises an inner wall and a plurality of stator slots arranged on the inner wall, wherein the plurality of stator slots are evenly distributed along the circumference of the inner wall, and every three adjacent stator slots constitute a stator slot group; In the radial direction of the stator core, a plurality of line slots are arranged in each stator slot, and the radius of each line slot in each stator slot from the rotation center of the stator core is different; in the circumferential direction of the stator core, the line slots with the same radius in each stator slot are surrounded to form a line slot layer; The winding comprises a three-phase winding, the three-phase winding is alternately wound around different stator slot groups in sequence along the circumferential direction of the stator core, and the three-phase winding is also alternately wound around each line slot layer; each phase winding comprises six, three or two branches respectively, each branch in the same phase winding is connected in parallel, each branch comprises a plurality of U-shaped wires connected in series, each U-shaped wire comprises a bent end, a welding end is formed between two U-shaped wires connected in series, the bent end and the welding end are alternately bridged between each stator slot group and alternately bridged between each line slot layer; The ends spanning between two adjacent wire trough layers are all bent ends of the U-shaped line or all welded ends of the U-shaped line; and the bent ends spanning between two adjacent wire trough layers have the same shape and the same span; the welded ends spanning between two adjacent wire trough layers have the same span and twist angle.

2. The motor stator according to claim 1, It is characterized in that The span of the bent end spanning between two adjacent wire trough layers is a full span; the span of the welding end spanning between two adjacent wire trough layers is a full span.

3. The motor stator according to claim 1, It is characterized in that The three adjacent stator slots in each stator slot group sequentially form three phase belts, the line slot layer includes a slot opening layer with the smallest radius and a slot bottom layer with the largest radius, the branch also spans between the stator slot groups in the slot opening layer, and the phase belts connected by the branch between two stator slot groups are different; and / or The branch is also connected across the stator slot groups in the slot bottom layer, and the phase belts connected by the branch between two stator slot groups are different.

4. The motor stator according to claim 3, It is characterized in that Each of the phase windings comprises a slot-changing section, the slot-changing section is connected across the stator slot groups in the slot opening layer, and the slot-changing section is also connected between the stator slot groups in the slot bottom layer; The slot-changing section includes three passages, and the three passages are used to realize phase band switching of each branch in the phase winding between the two stator slot groups through different span combinations.

5. The motor stator according to claim 4, It is characterized in that The span combination of the three passages in the slot-changing section is 10 / 10 / 7, or 8 / 8 / 11.

6. The motor stator according to claim 4, It is characterized in that The span combination of the three passages in the slot-changing section at the slot bottom layer is the same as the span combination of the three passages in the slot-changing section at the slot opening layer.

7. The motor stator according to claim 3, It is characterized in that The phase winding includes a first slot-changing line and a second slot-changing line. The first slot-changing line is connected across the stator slots in the slot opening layer, and the second slot-changing line is connected between the stator slots in the slot bottom layer. The first slot-changing line and the second slot-changing line are both used to realize phase belt switching of each branch in the phase winding.

8. The motor stator according to claim 7, It is characterized in that The spans of the first slot-changing lines are equal; and / or, The spans of the second slot-changing lines are equal.

9. The motor stator according to any one of claims 3 to 8, It is characterized in that The number of the line slot layers is an even number, and the branches are connected across different stator slots at both the slot opening layer and the slot bottom layer through the bent ends of the U-shaped wires; or The number of the line slot layers is an odd number, the branch is bridged between different stator slots in the slot opening layer through the bent end of the U-shaped line, and the branch is bridged between different stator slots in the slot bottom layer through the welding end; or the branch is bridged between different stator slots in the slot opening layer through the welding end, and the branch is bridged between different stator slots in the slot bottom layer through the bent end of the U-shaped line.

10. A motor, It is characterized in that It comprises a motor rotor and a motor stator as claimed in any one of claims 1 to 9, wherein the motor rotor is located inside the motor stator.

11. A vehicle, It is characterized in that Comprising the motor as claimed in claim 10.

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