Stator assembly, motor, power assembly and vehicle

Abstract

The utility model provides a stator assembly, a motor, a power assembly and a vehicle, the stator assembly comprises a stator core and a lead-in member, and the stator core and the lead-in member are coaxially laminated and connected; the stator core comprises a yoke part and a plurality of tooth parts, and the plurality of tooth parts are circumferentially distributed on the inner circumferential surface of the yoke part; a plurality of first cooling through holes are distributed in the yoke part in the circumferential direction and penetrate through the yoke part in the axial direction; a second cooling through hole is formed in the tooth part in the axial direction, and the second cooling through hole penetrates through the tooth part in the axial direction; a plurality of first cooling grooves and a plurality of second cooling grooves are distributed in the peripheral face of the guide-in piece in the circumferential direction, the first cooling grooves communicate with the first cooling through holes correspondingly, and the second cooling grooves communicate with the second cooling through holes correspondingly. The stator iron core is provided with the first cooling through hole for cooling the yoke part and the parts near the yoke part, and the stator iron core is provided with the second cooling through hole for cooling the tooth part and the parts near the tooth part, thereby facilitating the release of heat in the stator iron core, and further improving the cooling effect of the stator assembly.

Description

Technical Field

[0001] The present application relates to the technical field of drive devices, and in particular to a stator assembly, a motor, a powertrain, and a vehicle. Background Art

[0002] The electric motor in a new energy vehicle powertrain consists of a rotor and a stator assembly. With the development of electric vehicles, the demand for higher-speed and smaller motors in their powertrains is increasing. To maintain the same power output as existing powertrains, the motor's power density and torque density must be further improved, which also increases the difficulty of heat dissipation. In the stator assembly provided in related art, the windings in the stator slots have difficulty dissipating heat, resulting in poor cooling of the stator assembly. Utility Model Content

[0003] The present application provides a stator assembly, an electric motor, a powertrain, and a vehicle. In the stator assembly of the present application, the stator core is provided with first cooling holes for cooling the yoke and components adjacent to the yoke, and second cooling holes for cooling the teeth and components adjacent to the teeth. This facilitates heat release within the stator core and thereby improves the cooling effect of the stator assembly.

[0004] According to a first aspect of the present application, a stator assembly is provided, comprising a stator core and an introduction member, wherein the stator core and the introduction member are coaxially stacked and connected; the stator core comprises a yoke and a plurality of teeth, wherein the plurality of teeth are circumferentially distributed on the inner circumferential surface of the yoke; the yoke is provided with a plurality of first cooling holes along the circumferential direction, and the plurality of first cooling holes all penetrate the yoke along the axial direction; the teeth are provided with second cooling holes along the axial direction, and the second cooling holes penetrate the teeth along the axial direction; the outer circumferential surface of the introduction member is provided with a plurality of first cooling grooves and a plurality of second cooling grooves along the circumferential direction, wherein the plurality of first cooling grooves are respectively connected to the plurality of first cooling holes, and the plurality of second cooling grooves are respectively connected to the plurality of second cooling holes.

[0005] In some embodiments, the first cooling hole and the second cooling hole are both elongated holes, the inner diameter of the first cooling hole close to the axis of the stator core is smaller than the inner diameter of the first cooling hole away from the axis of the stator core, and the inner diameter of the second cooling hole close to the axis of the stator core is smaller than the inner diameter of the second cooling hole away from the axis of the stator core.

[0006] In some embodiments, the plurality of tooth portions include a first tooth portion and a second tooth portion arranged adjacent to each other, the first cooling hole is opened at the connection between the first tooth portion and the yoke portion, and the second cooling hole is opened in the second tooth portion; the first tooth portion includes a first side surface and a second side surface opposite to each other, the first cooling hole includes a first hole inner wall and a second hole inner wall opposite to each other, the first hole inner wall and the first side surface are parallel, and the second hole inner wall and the second side surface are parallel; the second tooth portion includes a third side surface and a fourth side surface opposite to each other, the second cooling hole includes a third hole inner wall and a fourth hole inner wall opposite to each other; the third hole inner wall and the third side surface are parallel, and the fourth hole inner wall and the fourth side surface are parallel.

[0007] In some embodiments, the tooth portion includes a root segment and a tooth top segment, the root segment and the tooth top segment are connected in sequence along the radial direction, and the root segment is connected between the yoke portion and the tooth top segment; the side wall of the root segment is concave inward, and / or the side wall of the tooth top segment is convex outward.

[0008] In some embodiments, the plurality of first cooling holes and the plurality of second cooling holes are alternately and spaced apart in the circumferential direction of the stator core; the plurality of first cooling slots and the plurality of second cooling slots are alternately and spaced apart on the outer circumferential surface of the introduction member.

[0009] In some embodiments, two adjacent tooth portions are spaced apart to form a plurality of first stator slots on the inner circumference of the stator core, and the first stator slots include a plurality of first slot layers distributed along the radial direction of the stator core; the stator assembly further includes a winding, and the winding includes a plurality of hairpin windings, each of the hairpin windings includes a pair of insertion portions inserted in different first stator slots, and each first slot layer of each first stator slot accommodates one of the insertion portions.

[0010] In some embodiments, the inserting portions of each hairpin winding are of equal size.

[0011] In some embodiments, there are two stator cores, which are a first stator core and a second stator core respectively. The first stator core, the introduction member and the second stator core are coaxially stacked and connected.

[0012] In some embodiments, the stator assembly also includes a casing, the casing having a accommodating space, the stator core and the introduction member are both accommodated in the accommodating space; a channel is formed between the outer peripheral surface of the introduction member and the inner wall surface of the accommodating space, the channel connecting the first cooling groove and the second cooling groove; the casing is provided with an inlet, the inlet connecting the channel; the coolant flows from the inlet to the channel, and from the channel flows to the first cooling groove and the second cooling groove respectively, from the first cooling groove flows to the plurality of first cooling holes, and from the second cooling groove flows to the plurality of second cooling holes.

[0013] In some embodiments, the stator core is interference-fitted with an inner wall surface of the accommodating space, and a radial dimension of the introduction member is smaller than a radial dimension of the stator core to form the channel.

[0014] In some embodiments, the stator core and the introduction piece are both interference fit with the inner wall surface of the accommodating space, and the inner wall surface of the casing is recessed inward to form the channel; the axial inner diameter of the channel is smaller than the axial dimension of the introduction piece.

[0015] In a second aspect, the present application further provides a motor, which includes a rotor and a stator assembly, wherein the rotor is disposed inside the stator assembly and can rotate relative to the stator assembly.

[0016] In a third aspect, the present application further provides a powertrain, which includes a reducer and a motor, wherein the reducer is transmission-connected to the motor.

[0017] In a fourth aspect, the present application also provides a vehicle, which includes a powertrain.

[0018] In the stator assembly provided in the present application, the stator assembly includes a stator core and an inlet member, the inlet member is used to transport coolant to multiple first cooling grooves and multiple second cooling grooves, the multiple first cooling grooves are respectively connected to multiple first cooling through holes, and the multiple second cooling grooves are respectively connected to multiple second cooling through holes. The coolant in the first cooling through holes is used to cool the yoke and components near the yoke, and the coolant in the second cooling through holes is used to cool the teeth and components near the teeth, which is beneficial to the release of heat inside the stator core, thereby improving the cooling effect of the stator assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the implementation. Obviously, the drawings described below are some implementations of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a stator assembly provided in one embodiment of the present application.

[0021] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure explosion of the stator core and the introduction part shown in the figure.

[0022] Figure 3 yes Figure 2 A partial enlarged view of the stator core shown in .

[0023] Figure 4 yes Figure 2 A partial enlarged view of the lead-in shown in FIG.

[0024] Figure 5 This is a partial enlarged view of the stator core provided by the related technology.

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure decomposition of a stator assembly provided in another embodiment of the present application.

[0026] Figure 7 It is a cross-sectional view of a stator assembly provided in another embodiment of the present application.

[0027] Figure 8 yes Figure 7 A partial enlarged view of the stator assembly shown in .

[0028] Figure 9 yes Figure 7 A partial cross-sectional view from another perspective of the stator assembly shown in .

[0029] Figure 10 yes Figure 7 A partial cross-sectional view of the stator assembly from another perspective shown in

[0030] Figure 11 A cross-sectional view of a stator assembly provided in yet another embodiment of the present application.

[0031] Figure 12 yes Figure 11 A cross-sectional view from another perspective of the stator assembly shown in .

[0032] Description of reference numerals:

[0033] 100 - stator assembly; 10 - stator core; 10a - first stator core; 10b - second stator core; 101 - first abutment surface; 103 - channel; 11 - yoke; 111 - first cooling hole; 12 - tooth; 1201 - first side surface; 1202 - second side surface; 1203 - third side surface; 1204 - fourth side surface; 12a - first tooth; 12b - second tooth; 121 - second cooling hole; 122 - tooth root segment; 1221 - first side wall; 1222 - second side wall. 123-tooth top section; 1231-third side wall; 1232-fourth side wall; 13-first boot; 110-first stator slot; 1101-first slot layer; 20-introduction piece; 201-second abutment surface; 202-first cooling groove; 203-second cooling groove; 21-introduction piece body; 22-protrusion; 221-root; 222-top; 23-second boot; 220-second stator slot; 30-winding; 31-hairpin winding; 40-housing; 401-accommodation space; 402-inlet. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" as used in this application includes any and all combinations of one or more of the relevant listed items.

[0037] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0038] See also Figure 1 and Figure 2The present application provides a stator assembly 100, which includes a stator core 10 and an introduction member 20. The radial cross-section of the stator core 10 is annular, and the radial cross-section of the introduction member 20 is also annular.

[0039] For ease of understanding, the axis direction of the stator assembly 100 is defined as the axial direction, that is, the axis direction of the stator core 10 and the guide piece 20 are both axial, the direction perpendicular to the axis direction of the stator assembly 100 and where the radius or diameter is located is defined as the radial direction, and the direction perpendicular to the axis direction of the stator assembly 100 and surrounding the axis direction of the stator assembly 100 is defined as the circumferential direction. The stator core 10 and the guide piece 20 are coaxially stacked, that is, the axis direction of the stator core 10 and the axis direction of the guide piece 20 are collinear, combined with Figure 2 The side of the stator core 10 facing the introduction piece 20 includes a first abutment surface 101, and the side of the introduction piece 20 facing the stator core 10 includes a second abutment surface 201. The first abutment surface 101 and the second abutment surface 201 abut against each other so that the stator core 10 and the introduction piece 20 are stacked and connected along the axial direction.

[0040] See also Figure 2 and Figure 3 The stator core 10 includes a yoke 11, a plurality of teeth 12 and a plurality of first boots 13. The plurality of teeth 12 and the plurality of first boots 13 correspond to each other one by one, and the teeth 12 are located between the yoke 11 and the first boots 13. The stator core 10 is formed by axially stacking a plurality of silicon steel sheets, and the connection between two adjacent silicon steel sheets can be bonding, riveting or welding. In order to simplify the process, the axial dimensions and radial dimensions of the plurality of silicon steel sheets are the same, and the plurality of silicon steel sheets share the same set of molds to save costs.

[0041] The yoke 11 has a circular radial cross-section and includes an outer circumferential surface and an inner circumferential surface, which face each other radially. Multiple teeth 12 are evenly distributed circumferentially on the inner circumferential surface of the yoke 11. In the radial direction of the stator core 10, the teeth 12 include a tooth root segment 122 and a tooth tip segment 123. The tooth root segment 122, tooth tip segment 123, and first shoe 13 are sequentially connected in the radial direction of the stator core 10, with the tooth root segment 122 connected between the yoke 11 and the tooth tip segment 123, and the first shoe 13 connected to the end of the tooth tip segment 123 facing away from the tooth root segment 122.

[0042] The yoke 11 is provided with a plurality of first cooling holes 111 along the axial direction, and the plurality of first cooling holes 111 axially penetrate the yoke 11. The teeth 12 are provided with second cooling holes 121 along the axial direction, and the second cooling holes 121 axially penetrate the teeth 12. The radial distance between the first cooling holes 111 and the axis of the stator core 10 is greater than the radial distance between the second cooling holes and the axis of the stator core 10.

[0043] See also Figure 2 and Figure 4 The introducer 20 includes an introducer body 21, a plurality of protrusions 22 and a plurality of second boots 23. The plurality of protrusions 22 and the plurality of second boots 23 correspond one to one respectively, and the protrusion 22 is located between the introducer body 21 and the second boots 23. The radial cross section of the introducer body 21 is annular, and the introducer body 21 includes an outer peripheral surface and an inner peripheral surface, and the outer peripheral surface and the inner peripheral surface of the introducer body 21 are radially opposite to each other. A plurality of second teeth are circumferentially evenly distributed on the inner peripheral surface of the introducer body 21. Along the radial direction of the introducer 20, the protrusion 22 includes a root 221 and a top 222, and the root 221, the top 222 and the second boot 23 are connected in sequence along the radial direction of the introducer 20, and the root 221 is connected between the introducer body 21 and the top 222, and the second boot 23 is connected to an end of the top 222 away from the root 221.

[0044] The outer circumferential surface of the introduction part 20 is provided with a plurality of first cooling grooves 202 and a plurality of second cooling grooves 203. The plurality of first cooling grooves 202 and the plurality of second cooling grooves 203 are all radially inwardly recessed along the outer circumferential surface of the introduction part body 21. Each first cooling groove 202 axially penetrates the introduction part body 21, and each second cooling groove 203 axially penetrates the introduction part body 21. The radial depth of the first cooling groove 202 is less than the radial depth of the second cooling groove 203.

[0045] In this embodiment, please refer to the Figures 2 to 4 The plurality of first cooling holes 111 and the plurality of second cooling holes 121 are arranged alternately and spaced apart along the circumference of the stator core 10. Specifically, the first cooling holes 111 are provided at the junction of the yoke 11 and the tooth root segment 122. That is, a portion of the first cooling holes 111 is provided in the yoke 11, and another portion of the first cooling holes 111 is provided in the tooth root segment 122. It should be noted that "the yoke 11 is provided with a plurality of first cooling holes 111 along the axial direction" means that at least a portion of the first cooling holes 111 is provided in the yoke 11. The plurality of first cooling slots 202 and the plurality of second cooling slots 203 are arranged alternately and spaced apart along the circumference of the guide member 20. That is, a first cooling slot 202 is provided on opposite sides of the second cooling slot 203, and a second cooling slot 203 is provided on opposite sides of the first cooling slot 202. The plurality of first cooling slots 202 are connected to the plurality of first cooling holes 111 in a one-to-one correspondence, and the plurality of second cooling slots 203 are connected to the plurality of second cooling holes 121 in a one-to-one correspondence. The coolant uniformly contacts the yoke 11 and the components near the yoke 11 along the circumferential direction, thereby uniformly cooling the components near the yoke 11. The coolant uniformly contacts the teeth 12 and the components near the teeth 12 along the circumferential direction, thereby uniformly cooling the components near the teeth 12, thereby improving the cooling effect of the stator assembly.

[0046] In the embodiment of the present application, coolant is delivered to the stator core 10 through the inlet 20 to remove heat from the stator core 10 and the inlet 20. Specifically, the coolant is delivered to the first cooling slot 202 and the second cooling slot 203 of the inlet 20, respectively. The coolant flows through the first cooling slot 202 to the first cooling through-hole 111. The coolant in the first cooling through-hole 111 can remove heat from the yoke 11 and the components near the yoke 11, thereby cooling the yoke 11 and the components near the yoke 11. The coolant flows through the second cooling slot 203 to the second cooling through-hole 121. The coolant in the second cooling through-hole 121 can remove heat from the teeth 12 and the components near the teeth 12, thereby cooling the teeth 12 and the components near the teeth 12. This facilitates heat release from the stator core 10 and improves the cooling effect of the stator assembly 100.

[0047] In some embodiments, see Figures 1 to 4 The stator assembly 100 further includes a winding 30 , which includes a plurality of hairpin windings 31 . The hairpin windings 31 are axially arranged through the stator core 10 and the lead-in piece 20 .

[0048] Specific reference Figure 3 Two adjacent tooth portions 12 are spaced apart along the circumferential direction of the stator core 10 , so that first stator slots 110 are spaced apart and distributed circumferentially on the inner circumference of the stator core 10 , and each first stator slot 110 penetrates the stator core 10 axially.

[0049] Specific reference Figure 4 , two adjacent protrusions 22 are arranged at intervals along the circumference of the introduction member 20, so that second stator slots 220 are provided at intervals along the circumference on the inner circumference of the introduction member 20, and each second stator slot 220 axially penetrates the introduction member 20. The plurality of first stator slots 110 and the plurality of second stator slots 220 are connected in a one-to-one correspondence. In the axial direction of the stator assembly 100, the first stator slots 110 and the second stator slots 220 penetrate the stator assembly 100. In a plane perpendicular to the axis of the stator assembly 100, the orthographic projection of the tooth portion 12 on the above plane coincides with the orthographic projection of the protrusion 22 on the above plane. In other words, the first stator slot 110 and the second stator slot 220 are the same in shape and size, thereby facilitating the insertion of the hairpin winding 31.

[0050] The hairpin winding 31 comprises two axially opposing ends of the stator assembly 100. The hairpin winding 31 is sequentially disposed axially through the first stator slot 110 and the second stator slot 220. One end of the hairpin winding 31 extends out of the sidewall of the stator core 10, facing away from the guide member 20. The other end of the hairpin winding 31 extends out of the sidewall of the guide member 20, facing away from the stator core 10. In this application, the width of the second shoe 23 is greater than the width of the protrusion 22, and the width of the first shoe 13 is greater than the width of the tooth 12, thereby preventing the hairpin winding 31 from escaping from the first stator slot 110 and the second stator slot 220.

[0051] The windings 30 in the stator assembly 100 are the primary heat source, generating a significant amount of heat. Coolant is primarily used to remove heat from the windings 30. Specifically, the coolant in the first cooling slots 202 can remove heat from the windings 30 near the inductor body 21, while the coolant in the first cooling holes 111 can remove heat from the windings 30 near the yoke 11, thereby cooling the windings 30 near the inductor body 21 and the yoke 11. The coolant in the second cooling slots 203 can remove heat from the windings 30 near the protrusions 22, while the coolant in the second cooling holes 121 can remove heat from the windings 30 near the teeth 12, thereby cooling the windings 30 near the teeth 12 and the protrusions 22. Coolant flowing out of the first cooling holes 111 can also cool the windings 30 extending from the inductor 20. Coolant flowing out of the first cooling holes 111 can also cool the windings 30 extending from the stator core 10, further removing heat from the windings 30.

[0052] In this example, the coolant is cooling oil. Because the cooling oil can flow directly through the ends of the windings 30, the heat dissipation area and temperature difference are significantly increased, resulting in better heat dissipation than water-cooled motors. Furthermore, the cooling oil itself serves both bearing and gear lubrication purposes. In other examples, the coolant can also be cold gas or cooling water, without limitation.

[0053] In this example, the winding 30 is a V-phase winding, and a V-shaped magnetic bridge is formed in the first stator slot 110 and the second stator slot 220. The first cooling hole 111, the second cooling hole 121, the first cooling slot 202 and the second cooling slot 203 are variable diameter structures, and it is necessary to satisfy that the inner diameter close to the axis of the stator assembly 100 is smaller than the inner diameter of the axis away from the stator assembly 100. In this way, the influence of magnetic circuit saturation in the stator assembly 100 can be reduced, the magnetic resistance of the stator assembly 100 can be reduced, and the performance of the stator assembly 100 can be improved.

[0054] For details, please refer to Figure 3 and Figure 4The first cooling hole 111 is an elongated hole with a major axis. The extension of the major axis of the first cooling hole 111 is collinear with the extension of the radius or diameter of the stator core 10. The second cooling hole 121 is an elongated hole with a major axis. The extension of the major axis of the second cooling hole 121 is collinear with the extension of the radius or diameter of the stator core 10. The inner diameter of the first cooling hole 111 near the axis of the stator core 10 is smaller than the inner diameter of the first cooling hole 111 away from the axis of the stator core 10. The inner diameter of the second cooling hole 121 near the axis of the stator core 10 is smaller than the inner diameter of the second cooling hole 121 away from the axis of the stator core 10. The first cooling groove 202 is a V-shaped groove, and the inner diameter of the first cooling groove 202 close to the axis of the guide member 20 is smaller than the inner diameter of the first cooling groove 202 away from the axis of the guide member 20. The second cooling groove 203 is a V-shaped groove, and the inner diameter of the second cooling groove 203 close to the axis of the guide member 20 is smaller than the inner diameter of the second cooling groove 203 away from the axis of the guide member 20.

[0055] Of course, in other examples, the first cooling groove 202 may be a U-shaped groove, a trapezoidal groove, etc., and the second cooling groove 203 may also be a U-shaped groove, a trapezoidal groove, etc., which is not limited here.

[0056] Furthermore, the plurality of teeth 12 include adjacent first and second teeth 12a, 12b. A second cooling hole 121 is provided in the first tooth 12a, and a first cooling hole 111 axially extends through the first tooth 12a. The first cooling hole 111 is provided at the junction of the second tooth 12b and the yoke 11. The first cooling hole 111 axially extends through at least a portion of the second tooth 12b, and the second cooling hole 121 axially extends through at least a portion of the yoke 11.

[0057] The first tooth portion 12a includes a first side surface 1201 and a second side surface 1202 facing each other. The first cooling hole 111 includes a first inner wall and a second inner wall facing each other. The first inner wall is parallel to the first side surface 1201, and the second inner wall is parallel to the second side surface 1202. The second tooth portion 12b includes a third inner wall 1203 and a fourth inner wall 1204 facing each other. The second cooling hole 121 includes a third inner wall and a fourth inner wall facing each other. The third inner wall is parallel to the third side surface 1203, and the fourth inner wall is parallel to the fourth side surface 1204. This further reduces the effects of magnetic circuit saturation in the stator assembly 100, further reduces the magnetic resistance of the stator assembly 100, and further improves the performance of the stator assembly 100.

[0058] See also Figures 1 to 3The inner wall of the stator core 10 is axially provided with a plurality of first stator slots 110 , each first stator slot 110 includes a plurality of first slot layers 1101 distributed radially along the stator core 10 , and the number of the first slot layers 1101 is an even number greater than or equal to 4.

[0059] In this example, there are 72 first stator slots 110 and 6 first slot layers 1101. Each hairpin winding 31 includes a pair of insertion portions (not shown) inserted into different first stator slots 110, and each first slot layer 1101 of each first stator slot 110 accommodates one insertion portion. In other words, a first stator slot 110 having 6 first slot layers 1101 is provided with insertion portions for 6 hairpin windings 31, and the insertion portions of the 6 hairpin windings 31 are stacked in one first stator slot 110, thereby dividing the first stator slot 110 into 6 layers. Those skilled in the art will also appreciate that insulating paper is provided between the insertion portions between two adjacent first slot layers 1101 in the same first stator slot 110.

[0060] The stator core 10 will be described in detail below by taking an example in which the number of the first stator slots 110 is 72 and each first stator slot 110 includes 6 first slot layers 1101 .

[0061] First, the 72 first stator slots 110 and the 6 first slot layers of the stator core 10 are numbered. The 72 first stator slots 110 are numbered 1, 2, ..., 72 in the axial direction. Of course, they can be numbered clockwise or counterclockwise, which does not affect the implementation of the embodiment of the present application. The 6 first slot layers 1101 are numbered a, b, c, d, e, and f in the radial direction of the stator core 10, where a is the innermost layer and f is the outermost layer. It can be understood by those skilled in the art that the innermost layer refers to the side close to the yoke 11, and the outermost layer refers to the side away from the yoke 11. In this way, each first slot layer 1101 of each first stator slot 110 will have a unique label. For example, the first layer of the 1st slot can be represented by 1a. Similarly, the third layer of the 48th slot can be represented by the number 48c. Similarly, the sixth layer of the 72nd slot can be represented by the number 72f. Those skilled in the art can also understand that, since the first stator slots 110 are arranged circumferentially, the 73rd slot appears due to the subsequent span calculation, that is, one circle of winding is completed and returns to the 1st slot, that is, the 73rd slot is the 1st slot, and so on.

[0062] In this example, the first layer is arranged in a single layer, the second and third layers are arranged in a cross-layer arrangement, the fourth and fifth layers are arranged in a cross-layer arrangement, and the sixth layer is arranged in a single layer. The span of each hairpin winding is 7 spans.

[0063] Specifically, in the first layer, a pair of insertion parts of the first hairpin winding 31 are respectively inserted in the first layer (1a) of the first slot and the first layer (8a) of the eighth slot, a pair of insertion parts of the second hairpin winding 31 are respectively inserted in the first layer (2a) of the second slot and the first layer (9a) of the ninth slot, ..., a pair of insertion parts of the 36th hairpin winding 31 are respectively inserted in the first layer (72a) of the 72nd slot and the first layer (7a) of the 7th slot.

[0064] In the second and third layers, a pair of insertion portions of the first hairpin winding 31 are respectively inserted in the second layer (1b) of the first slot and the third layer (8c) of the eighth slot, a pair of insertion portions of the second hairpin winding 31 are respectively inserted in the second layer (2b) of the second slot and the third layer (9c) of the ninth slot, ..., a pair of insertion portions of the 72nd hairpin winding 31 are respectively inserted in the second layer (72b) of the 72nd slot and the third layer (7c) of the 7th slot.

[0065] In the 4th and 5th layers, a pair of insertion parts of the 1st hairpin winding 31 are respectively inserted in the 4th layer (1d) of the 1st slot and the 5th layer (8e) of the 8th slot, a pair of insertion parts of the 2nd hairpin winding 31 are respectively inserted in the 4th layer (2d) of the 2nd slot and the 5th layer (9e) of the 9th slot, ..., a pair of insertion parts of the 72nd hairpin winding 31 are respectively inserted in the 4th layer (72d) of the 72nd slot and the 5th layer (7e) of the 7th slot.

[0066] In the 6th layer, a pair of insertion parts of the 1st hairpin winding 31 are respectively inserted in the 6th layer (1f) of the 1st slot and the 6th layer (8f) of the 8th slot, a pair of insertion parts of the 2nd hairpin winding 31 are respectively inserted in the 6th layer (2f) of the 2nd slot and the 6th layer (9f) of the 9th slot, ..., a pair of insertion parts of the 36th hairpin winding 31 are respectively inserted in the 6th layer (72f) of the 72nd slot and the 6th layer (7f) of the 7th slot.

[0067] In other examples, the span of each hairpin winding may be 8, 9, 11 or other spans, which is not limited here.

[0068] See also Figure 5 In the stator core 10 provided by the related art, the outer diameter difference along the width direction of the tooth root section 122 of the tooth portion 12 relative to the tooth top section 123 of the tooth portion 12 is large, resulting in a large magnetic resistance of the stator assembly 100 when the magnetic density is high saturated, affecting the performance of the stator assembly 100.

[0069] See also Figure 3In the stator core 10 provided in the embodiment of the present application, the tooth root section 122 of the tooth portion 12 includes a first side wall surface 1221 and a second side wall surface 1222. The first side wall surface 1221 and the second side wall surface 1222 are opposite to each other in the width direction relative to the tooth root section 122. The first side wall surface 1221 is concave inward, that is, the first side wall surface 1221 is concave toward the direction of the second side wall surface 1222; or the second side wall surface 1222 is concave inward, that is, the second side wall surface 1222 is concave toward the first side wall surface 122 1; or, the first side wall surface 1221 and the second side wall surface 1222 are both recessed inwardly, that is, the first side wall surface 1221 is recessed toward the second side wall surface 1222, and the second side wall surface 1222 is recessed toward the first side wall surface 1221, so as to reduce the outer diameter difference of the tooth root section 122 of the tooth portion 12 relative to the tooth top section 123 of the tooth portion 12 along the width direction, thereby reducing the magnetic resistance of the stator assembly 100 under high saturation of magnetic flux density, and providing the electromagnetic torque of the stator assembly 100.

[0070] In other examples, the tooth top section 123 of the tooth portion 12 includes a third side wall surface 1231 and a fourth side wall surface 1232, and the third side wall surface 1231 and the fourth side wall surface 1232 are opposite to each other in the width direction relative to the tooth top section 123, and the third side wall surface 1231 protrudes outward, that is, the third side wall surface 1231 protrudes toward the fourth side wall surface 1232; or the fourth side wall surface 1232 protrudes outward, that is, the fourth side wall surface 1232 protrudes toward the third side wall surface 1231; or, both the third side wall surface 1231 and the fourth side wall surface 1232 protrude outward, that is, the third side wall surface 1231 protrudes toward the fourth side wall surface 1232, and the fourth side wall surface 1232 protrudes toward the third side wall surface 1231, so as to reduce the outer diameter difference of the tooth root section 122 of the tooth portion 12 relative to the tooth top section 123 of the tooth portion 12 in the width direction.

[0071] In other examples, the first side wall surface 1221 and / or the second side wall surface 1222 of the root segment 122 are recessed inward, and the third side wall surface 1231 and / or the fourth side wall surface 1232 of the top segment 123 are protruding outward to reduce the outer diameter difference of the root segment 122 of the tooth portion 12 relative to the top segment 123 of the tooth portion 12 in the width direction.

[0072] Please continue reading Figure 3By reducing the outer diameter of the tooth root segment 122 and increasing the outer diameter of the tooth tip segment 123, the width of the first slot layers 1101 between two adjacent tooth root segments 122 is equal, and the radial dimensions of different first slot layers 1101 are equal. Between two adjacent tooth tip segments 123, the width of different first slot layers 1101 is equal, and the radial dimensions of different first slot layers 1101 are equal. The width of the first slot layers 1101 between the tooth root segments 122 is equal to the radial dimension of the first slot layers 1101 between the tooth tip segments 123, and the radial dimension of the first slot layers 1101 between the tooth root segments 122 is equal to the width of the first slot layers 1101 between the tooth tip segments 123.

[0073] Specifically, in this embodiment, three first slot layers 1101 are located between two adjacent tooth tip segments 123. Each of these first slot layers 1101 has a first width dimension and a first radial dimension. Three first slot layers 1101 are located between two adjacent tooth root segments 122. Each of these first slot layers 1101 has a second width dimension and a second radial dimension. The second width dimension is equal to the first radial dimension, and the second radial dimension is equal to the first width dimension. Thus, the present application utilizes only one specification of hairpin winding 31 to complete the assembly of the stator assembly 100, simplifying the manufacturing process, reducing production costs, and facilitating mass production.

[0074] In some embodiments, see Figure 1 and Figure 2 The stator core 10 comprises two stators, namely a first stator core 10a and a second stator core 10b. The first stator core 10a and the second stator core 10b axially clamp the guide member 20. The first stator core 10a, the guide member 20, and the second stator core 10b are coaxially stacked and connected. The first stator core 10a and the second stator core 10b are axially symmetrical about the guide member 20. The structures of the first stator core 10a and the second stator core 10b are similar and will not be further described here.

[0075] The hairpin winding 31 is axially arranged in sequence through the first stator slot 110 of the first stator core 10a, the second stator slot 220 of the introduction member 20 and the first stator slot 110 of the second stator core 10b. One end of the hairpin winding 31 extends out of the side wall surface of the first stator core 10a away from the introduction member 20, and the other end of the hairpin winding 31 extends out of the side wall surface of the second stator core 10b away from the introduction member 20.

[0076] The following will continue to describe the specific structure of the stator assembly 100 by taking two stator cores 10 , which are a first stator core 10 a and a second stator core 10 b , as an example.

[0077] In some embodiments, see Figures 6 to 10The stator assembly 100 further includes a housing 40, which is hollow and cylindrical. The housing 40 has a housing space 401 and openings extending axially through both ends, with the housing space 401 communicating with the openings. The first stator core 10a, the guide member 20, and the second stator core 10b are all housed within the housing space 401. A channel 103 is formed between the outer circumference of the guide member 20 and the inner wall of the housing space 401, connecting the first cooling groove 202 and the second cooling groove 203. The housing 40 also has an inlet 402, which extends radially through the housing 40 and communicates with the channel 103.

[0078] For details, please refer to Figures 7 and 8 The first stator core 10a and the second stator core 10b are both interference fit with the inner wall surface of the accommodating space 401, and the introduction piece 20 is located between the first stator core 10a and the second stator core 10b. The radial dimension of the first stator core 10a is equal to the radial dimension of the second stator core 10b. The radial dimension of the introduction piece 20 is smaller than the radial dimension of the first stator core 10a, so that a channel 103 is formed between the outer peripheral surface of the introduction piece 20 and the inner wall surface of the casing 40, and the channel 103 is used for supplying coolant.

[0079] Combine Figure 8 , the coolant flows from the inlet 402 to the channel 103, and from the channel 103 to the first cooling groove 202 and the second cooling groove 203 respectively. Figure 3 and Figure 9 , flows from the first cooling groove 202 to the plurality of first cooling holes 111, that is, the first cooling groove 202 flows leftward to the first cooling holes 111 of the first stator core 10a, and the first cooling groove 202 flows rightward to the first cooling holes 111 of the second stator core 10b, for cooling the winding 30 near the yoke 11. The coolant flowing out of the first cooling holes 111 is sprayed onto the winding 30 for cooling the winding 30. Combined Figure 3 and Figure 10 The coolant flows from the second cooling slots 203 to the second cooling holes 121. Specifically, the second cooling slots 203 flow leftward toward the second cooling holes 121 of the first stator core 10a, and rightward toward the second cooling holes 121 of the second stator core 10b. This coolant is used to cool the windings 30 near the teeth 12. The coolant flowing out of the second cooling holes 121 is sprayed onto the windings 30, cooling them.

[0080] In some embodiments, see Figure 11 and Figure 12, the first stator core 10a, the introduction member 20, and the second stator core 10b are all interference fit with the inner wall surface of the accommodating space 401. Specifically, the radial dimensions of the first stator core 10a, the radial dimensions of the introduction member 20, and the radial dimensions of the second stator core 10b are equal to each other, and the inner wall surface of the housing 40 is recessed inward along its circumference to form a channel 103, wherein the axial inner diameter of the channel 103 is smaller than the axial dimension of the introduction member 20, so that the introduction member 20 can be interference fit with the inner wall surface of the accommodating space 401. The flow path of the coolant in this embodiment is the same as the flow path of the above embodiment, and will not be described in detail here.

[0081] An embodiment of the present application further provides a motor. In this embodiment, the motor includes a rotor and any of the above-described stator assemblies 100. The rotor is disposed within the stator assemblies 100 and is rotatable relative to the stator assemblies 100. Since the stator assemblies 100 include all of the technical solutions of all of the above-described embodiments, they at least have all of the beneficial effects brought about by the technical solutions of the above-described embodiments, and are not further detailed here.

[0082] The present application also provides a powertrain, which includes a reducer and the aforementioned motor, with the reducer being in driving connection with the motor. The motor of the powertrain includes a stator assembly 100, and thus exhibits at least all the beneficial effects of the stator assembly 100 of the aforementioned embodiment, which will not be further elaborated here.

[0083] The present application also provides a vehicle in an embodiment, comprising the aforementioned powertrain. The vehicle's powertrain includes a stator assembly 100, and thus exhibits at least all the beneficial effects of the stator assembly 100 described in the aforementioned embodiment, which are not further detailed here. The vehicle may be an electric vehicle or an electric motorcycle, without limitation.

[0084] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application.

Claims

1. A stator assembly, characterized in that: The stator assembly comprises a stator core and an introduction piece, wherein the stator core and the introduction piece are coaxially laminated and connected; The stator core comprises a yoke and a plurality of teeth, wherein the plurality of teeth are circumferentially distributed on the inner circumferential surface of the yoke; the yoke is circumferentially distributed with a plurality of first cooling through holes, wherein the plurality of first cooling through holes all penetrate the yoke in the axial direction; the teeth are axially provided with second cooling through holes, wherein the second cooling through holes penetrate the teeth in the axial direction; A plurality of first cooling grooves and a plurality of second cooling grooves are distributed circumferentially on the outer peripheral surface of the introduction member. The plurality of first cooling grooves are respectively connected to the plurality of first cooling through holes, and the plurality of second cooling grooves are respectively connected to the plurality of second cooling through holes.

2. The stator assembly according to claim 1, characterized in that The first cooling hole and the second cooling hole are both long holes, the inner diameter of the first cooling hole close to the axis of the stator core is smaller than the inner diameter of the first cooling hole away from the axis of the stator core, and the inner diameter of the second cooling hole close to the axis of the stator core is smaller than the inner diameter of the second cooling hole away from the axis of the stator core.

3. The stator assembly according to claim 2, characterized in that: The plurality of tooth portions include a first tooth portion and a second tooth portion that are adjacently arranged, the first cooling through hole is opened at a connection between the first tooth portion and the yoke portion, and the second cooling through hole is opened at the second tooth portion; The first tooth portion includes a first side surface and a second side surface opposite to each other, the first cooling through hole includes a first hole inner wall and a second hole inner wall opposite to each other, the first hole inner wall is parallel to the first side surface, and the second hole inner wall is parallel to the second side surface; The second tooth portion includes a third side surface and a fourth side surface opposite to each other, and the second cooling through hole includes a third hole inner wall and a fourth hole inner wall opposite to each other; the third hole inner wall is parallel to the third side surface, and the fourth hole inner wall is parallel to the fourth side surface.

4. The stator assembly according to claim 1, characterized in that: The tooth portion includes a tooth root segment and a tooth top segment, wherein the tooth root segment and the tooth top segment are connected in sequence along the radial direction, and the tooth root segment is connected between the yoke portion and the tooth top segment; the side wall of the tooth root segment is concave inwardly, and / or the side wall of the tooth top segment is convex outwardly.

5. The stator assembly according to claim 1, characterized in that The plurality of first cooling through holes and the plurality of second cooling through holes are alternately and spaced apart in the circumferential direction of the stator core; the plurality of first cooling grooves and the plurality of second cooling grooves are alternately and spaced apart on the outer circumferential surface of the introduction member.

6. The stator assembly according to claim 1, characterized in that Two adjacent teeth are spaced apart to form a plurality of first stator slots on the inner circumference of the stator core, wherein the first stator slots include a plurality of first slot layers distributed along the radial direction of the stator core; The stator assembly further includes a winding, wherein the winding includes a plurality of hairpin windings, each of the hairpin windings includes a pair of insertion portions inserted in different first stator slots, and each first slot layer of each first stator slot accommodates one of the insertion portions.

7. The stator assembly according to claim 6, characterized in that The size of each of the inserting parts of each of the hairpin windings is equal.

8. The stator assembly according to claim 1, characterized in that There are two stator cores, which are respectively a first stator core and a second stator core. The first stator core, the introduction member and the second stator core are coaxially stacked and connected.

9. The stator assembly according to any one of claims 1 to 8, characterized in that: The stator assembly further comprises a housing, wherein the housing has a receiving space, and the stator core and the guide piece are both received in the receiving space; A channel is formed between the outer peripheral surface of the introduction member and the inner wall surface of the accommodation space, and the channel is connected to the first cooling groove and the second cooling groove; the housing is provided with an inlet, and the inlet is connected to the channel; The coolant flows from the inlet to the channel, flows from the channel to the first cooling slot and the second cooling slot respectively, flows from the first cooling slot to the first cooling through holes, and flows from the second cooling slot to the second cooling through holes.

10. The stator assembly according to claim 9, characterized in that The stator core is interference-fitted with the inner wall surface of the accommodating space, and the radial dimension of the introduction piece is smaller than the radial dimension of the stator core, so as to form the channel.

11. The stator assembly according to claim 9, characterized in that The stator core and the introduction piece are both interference fit with the inner wall surface of the accommodating space, and the inner wall surface of the housing is recessed inward to form the channel; the axial inner diameter of the channel is smaller than the axial dimension of the introduction piece.

12. A motor, characterized in that: The motor comprises a rotor and a stator assembly as claimed in any one of claims 1 to 11, wherein the rotor is disposed inside the stator assembly and can rotate relative to the stator assembly.

13. A powertrain, characterized in that: The power assembly includes a reducer and the motor as claimed in claim 12, and the reducer is drivingly connected to the motor.

14. A vehicle, characterized in that: The vehicle includes the powertrain of claim 13 .

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