Stator core, stator core assembly, motor, power assembly and vehicle

Abstract

The utility model discloses a stator iron core, a stator iron core assembly, a motor, a power assembly and a vehicle, the stator iron core comprises a plurality of first punching sheets which are sequentially superposed along the axial direction of the stator iron core, and the peripheral wall of each first punching sheet comprises a first side wall and a second side wall which are sequentially arranged along the circumferential direction of the stator iron core. The distance between the first side wall and the central axis of the first punching sheet is x1, the distance between the second side wall and the central axis of the first punching sheet is x2, x1 is greater than x2, the peripheral wall of the first punching sheet is arranged around the central axis of the first punching sheet, and the first side walls of two adjacent first punching sheets are arranged in a staggered manner along the circumferential direction of the stator core. A plurality of first heat exchange runners which are arranged at intervals in the axial direction of the stator core and are staggered in the circumferential direction of the stator core are formed on the outer circumferential wall of the stator core, and each first heat exchange runner extends in the circumferential direction of the stator core and corresponds to the second side wall of one first punching sheet. According to the stator iron core provided by the embodiment of the utility model, the process complexity of the stator iron core in the stacking process can be reduced, and the production takt is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator core, a stator core component, a motor, a power assembly and a vehicle. Background Art

[0002] New energy vehicles have become the mainstream direction of future automotive technology development. With the rapid development of new energy vehicle drive technology, the market has gradually raised its requirements for all aspects of new energy vehicle drive systems. As one of the core components of the drive system, the motor needs to meet the increasingly stringent vehicle drive requirements while continuously reducing the size, weight and cost, which poses a huge challenge to the motor cooling system.

[0003] Among them, the stator core assembly is an important part of the motor, wherein the stator core assembly generally includes a stator core, a stator winding, etc. In the related art, the stator core is formed by stacking a plurality of punching sheets, and a heat exchange flow channel is formed on the outer peripheral wall of the stator core to cool the stator core. However, the processing of the stator core is complicated and the production efficiency is not high. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a stator core, which can reduce the process complexity in the stacking process and improve the production cycle.

[0005] The utility model also provides a stator core assembly having a stator core.

[0006] The utility model also provides a motor with a stator core assembly.

[0007] The utility model also provides a power assembly with a motor.

[0008] The utility model also provides a vehicle with a power assembly or a motor.

[0009] According to the stator core of the first aspect embodiment of the utility model, the stator core includes a plurality of first punching sheets stacked in sequence along the axial direction of the stator core, the outer peripheral wall of the first punching sheet includes a first side wall and a second side wall arranged in sequence along the circumferential direction of the stator core, the distance between the first side wall and the central axis of the first punching sheet is x1, the distance between the second side wall and the central axis of the first punching sheet is x2, x1 is greater than x2, the outer peripheral wall of the first punching sheet is arranged around the central axis of the first punching sheet, and the first side walls of two adjacent first punching sheets are staggered along the circumferential direction of the stator core, so that a plurality of first heat exchange flow channels arranged at intervals along the axial direction of the stator core and staggered along the circumferential direction of the stator core are formed on the outer peripheral wall of the stator core, each of the first heat exchange flow channels extends along the circumference of the stator core and corresponds to the second side wall of a first punching sheet.

[0010] According to the stator core of the embodiment of the utility model, the stator core is formed by stacking a plurality of first punching sheets, and two adjacent first punching sheets are staggered along the circumference of the stator core to form a plurality of first heat exchange channels on the outer peripheral wall of the stator core. This can reduce the process complexity of the stator core during the stacking process, improve the production cycle, and help improve the production efficiency of the stator core.

[0011] In some embodiments, the first punching sheet includes a plurality of first sheets stacked along the axial direction of the stator core, and on a plane perpendicular to the central axis, the orthographic outer contours of the plurality of first sheets of the first punching sheet completely overlap.

[0012] In some embodiments, in the axial direction of the stator core, the lengths of the plurality of first punching sheets are equal; and / or, in the axial direction of the stator core, the length of the first punching sheet is t', 1mm≤t'≤1.5mm.

[0013] In some embodiments, at least one second heat exchange channel extending along the axial direction of the stator core is further formed on the outer peripheral wall of the stator core, and the second heat exchange channel is respectively connected to each of the first heat exchange channels.

[0014] In some embodiments, the circumferential offset angle between any two adjacent first punching sheets is 180°.

[0015] In some embodiments, on a plane perpendicular to the central axis, with the orthographic projection of the central axis of the first punching sheet as the center of the circle, the central angle corresponding to the first side wall is smaller than the central angle corresponding to the second side wall, and the circumferential misalignment angle of two adjacent first punching sheets is larger than the central angle corresponding to the first side wall and smaller than the central angle corresponding to the second side wall, so that the second heat exchange flow channels are multiple and are arranged at circumferential intervals along the stator core.

[0016] In some embodiments, the widths of the plurality of second heat exchange channels in the circumferential direction of the stator core are equal.

[0017] In some embodiments, on a plane perpendicular to the central axis, with the orthographic projection of the central axis of the first punching sheet as the center of the circle, the sum of the central angles corresponding to all the first side walls and the central angles corresponding to all the second side walls is 360°, and there is one first side wall and one second side wall respectively; or, there are multiple first side walls and multiple second side walls respectively, and the multiple first side walls and the multiple second side walls are alternately arranged one by one along the circumference of the stator core.

[0018] In some embodiments, the first side wall and the second side wall are respectively arc-shaped, and the center of the first side wall and the center of the second side wall are both located on the central axis.

[0019] In some embodiments, the stator core further includes a second punching sheet, and the second punching sheet is respectively provided at both axial ends of the plurality of first punching sheets, the outer contour of the second punching sheet is circular, and the outer diameter of the second punching sheet is greater than x2.

[0020] In some embodiments, the first side wall is an arc surface, and the radius of the first side wall is half of the outer diameter of the second punching sheet.

[0021] In some embodiments, the second punching sheet includes a plurality of second sheets stacked axially along the stator core, and on a plane perpendicular to the central axis, the outer contours of the orthographic projections of the plurality of second sheets of the second punching sheet completely overlap.

[0022] In some embodiments, in the axial direction of the stator core, the length of the second punching sheet is greater than the length of the first punching sheet; and / or, in the axial direction of the stator core, the length of the second punching sheet is t, t≥8 mm.

[0023] In some embodiments, the second punching sheet forms a third heat exchange channel directly or indirectly connected to the first heat exchange channel, and the third heat exchange channel penetrates the side wall of the second punching sheet away from the first punching sheet to form an outlet, wherein the central axis of the outlet is parallel to the central axis of the first punching sheet, so that the heat exchange medium at the outlet is suitable for flowing to the stator winding provided in the stator core; or, the central axis of the outlet is set at an angle to the central axis of the first punching sheet, so that the heat exchange medium at the outlet is suitable for flowing to the stator winding provided in the stator core.

[0024] In some embodiments, at least one second heat exchange channel extending along the axial direction of the stator core is also formed on the outer peripheral wall of the stator core, and the second heat exchange channel is respectively connected to each of the first heat exchange channels, and the third heat exchange channel is connected to the first heat exchange channel through at least one of the second heat exchange channels.

[0025] In some embodiments, the third heat exchange channel is formed on the outer peripheral wall of the second punching plate or inside the second punching plate.

[0026] The stator core assembly according to the second aspect of the present invention comprises a stator winding and a stator core according to the first aspect of the present invention, wherein the stator winding is arranged on the stator core and the axial ends of the stator winding are respectively protruded from the stator core.

[0027] According to the stator core assembly of the embodiment of the utility model, the heat exchange effect of the stator core assembly can be improved by adopting the above-mentioned stator core.

[0028] The motor according to the embodiment of the third aspect of the utility model comprises the stator core assembly according to the embodiment of the second aspect of the utility model.

[0029] According to the motor of the embodiment of the utility model, the performance of the motor can be improved by adopting the above-mentioned stator core assembly.

[0030] In some embodiments, the motor includes a spray part, and the spray parts are respectively provided at both axial ends of the stator core. A spray flow channel and a spray hole connected to the spray flow channel are formed on the spray part. The spray flow channel is directly or indirectly connected to the first heat exchange flow channel. The spray hole is formed on the inner circumferential wall of the spray part so that the heat exchange medium at the spray hole is suitable for flowing to the stator winding arranged in the stator core.

[0031] In some embodiments, the spray member is formed into an annular structure, and a plurality of the spray holes are arranged at intervals along the circumferential direction and / or axial direction of the spray member.

[0032] In some embodiments, the motor further includes a shell having an installation cavity therein, the stator core is disposed in the installation cavity, a medium inlet and a medium outlet are formed on the shell, the medium inlet is connected to the first heat exchange channel, and the medium outlet is connected to the installation cavity.

[0033] The power assembly according to the fourth aspect of the present invention comprises the motor according to the third aspect of the present invention.

[0034] According to the power assembly of the embodiment of the utility model, the performance of the power assembly can be improved by adopting the above-mentioned motor.

[0035] The vehicle according to the fifth aspect of the present invention comprises the powertrain according to the fourth aspect of the present invention or the motor according to the third aspect of the present invention.

[0036] According to the vehicle of the embodiment of the utility model, the performance of the vehicle can be improved by adopting the above-mentioned power assembly or motor.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 is a schematic diagram of a stator core according to some embodiments of the utility model;

[0040] Figure 2 yes Figure 1 An enlarged view of section A shown in;

[0041] Figure 3 yes Figure 1 Another schematic diagram of the stator core shown in ;

[0042] Figure 4 yes Figure 3 An enlarged view of section B shown in;

[0043] Figure 5 is a schematic diagram of a first punching sheet according to some embodiments of the utility model;

[0044] Figure 6 is a schematic diagram of a second punching sheet according to some embodiments of the utility model;

[0045] Figure 7 is a schematic diagram of an outlet according to some embodiments of the utility model;

[0046] Figure 8 is a schematic diagram of a stator core assembly according to some embodiments of the utility model;

[0047] Fig. 9 is a partial structural schematic diagram of a motor according to some embodiments of the utility model;

[0048] Fig.10 yes Fig. 9 Exploded view of the motor shown in .

[0049] Reference numerals:

[0050] Motor 300, housing 201, mounting cavity 201a, stator winding 202, input pipe 203,

[0051] Stator core assembly 200,

[0052] stator core 100, first heat exchange channel 10a, second heat exchange channel 10b, central axis 10c,

[0053] first punching sheet 1, symmetry axis 1a, first side wall 11, second side wall 12, first sheet body 13,

[0054] The second punching plate 2, the outlet 2a, the third heat exchange channel 21,

[0055] Spraying element 3 , spraying channel 31 , and spraying hole 32 . DETAILED DESCRIPTION

[0056] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0057] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0058] Hereinafter, a stator core 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0059] like Figure 1-Figure 2 and Figure 5As shown, the stator core 100 includes a plurality of first punching sheets 1 stacked in sequence along the axial direction of the stator core 100, and the outer peripheral wall of the first punching sheet 1 includes a first side wall 11 and a second side wall 12 sequentially arranged along the circumferential direction of the stator core 100, the distance between the first side wall 11 and the central axis 10c of the first punching sheet 1 is x1, the distance between the second side wall 12 and the central axis 10c of the first punching sheet 1 is x2, and x1 is greater than x2; wherein, the outer peripheral wall of the first punching sheet 1 is arranged around the central axis 10c of the first punching sheet 1, and the outer peripheral wall of the first punching sheet 1 has no intersection with the central axis 10c of the first punching sheet 1.

[0060] It can be understood that the distance between any point on the first side wall 11 and the central axis 10c of the first punch 1 can be the first distance, that is, the distance between any point on the first side wall 11 and the central axis 10c of the first punch 1 is equal, and the first distance is x1 at this time. The first side wall 11 can be formed as a part of a cylindrical surface, and x1 is the radius of the first side wall 11; or, there are at least two points on the first side wall 11 with different distances from the central axis 10c of the first punch 1, and x1 can be understood as the minimum distance between a point on the first side wall 11 and the central axis 10c, but is not limited to this. Similarly, the distance between any point on the second side wall 12 and the central axis 10c of the first punch 1 can be the second distance, that is, the distance between any point on the second side wall 12 and the central axis 10c of the first punch 1 is equal, and the second distance is x2 at this time. The second side wall 12 can be formed as a part of a cylindrical surface, and x2 is the radius of the second side wall 12; or, there are at least two points on the second side wall 12 with different distances from the central axis 10c of the first punch 1, and x2 can be understood as the maximum distance between a point on the second side wall 12 and the central axis 10c, but is not limited to this.

[0061] For example, the distance between the first side wall 11 and the central axis 10c of the first punch 1 is greater than the distance between the second side wall 12 and the central axis 10c of the first punch 1. It can be understood that the distance between any point on the first side wall 11 and the central axis 10c of the first punch 1 is greater than the distance between any point on the second side wall 12 and the central axis 10c of the first punch 1; for another example, the distance between a first point on the first side wall 11 of one of two adjacent first punches 1 and the central axis 10c is greater than the distance between a second point on the second side wall 12 axially opposite to the above-mentioned first point and the central axis 10c.

[0062] It can be understood that the first punching sheet 1 can include at least one first sheet body 13; when the first punching sheet 1 includes multiple first sheets 13, the multiple first sheets 13 can be stacked in sequence along the axial direction of the stator core 100, and at this time, the thickness direction of the first sheet body 13 is the axial direction of the stator core 100; the number of first sheets 13 of multiple first punching sheets 1 can be equal or unequal.

[0063] The first side walls 11 of two adjacent first punching sheets 1 are staggered along the circumference of the stator core 100, so that a plurality of first heat exchange channels 10a are formed on the outer peripheral wall of the stator core 100. The plurality of first heat exchange channels 10a are spaced apart along the axial direction of the stator core 100, and two adjacent first heat exchange channels 10a are staggered along the circumference of the stator core 100. Each first heat exchange channel 10a extends along the circumference of the stator core 100, and each first heat exchange channel 10a corresponds to the second side wall 12 of a first punching sheet 1. It can be seen that among the multiple first punches 1, there are at least two adjacent first punches 1 whose first side walls 11 are circumferentially staggered, then at least two adjacent first punches 1 are circumferentially staggered, so that at least part of the first side wall 11 of one of the two adjacent first punches 1 among the multiple first punches 1 is axially opposite to the second side wall 12 of the other, and the number of circumferentially staggered first punches 1 is less than or equal to the total number of first punches 1; illustratively, the first side walls 11 of any two adjacent first side walls 11 of the multiple first punches 1 are circumferentially staggered.

[0064] It can be understood that each first heat exchange channel 10a corresponds to a second side wall 12 of a first punch 1. It can be understood that the bottom wall of the first heat exchange channel 10a can be at least partially defined by the second side wall 12 of a first punch 1, and the medium in the first heat exchange channel 10a can directly contact the second side wall 12 of the above-mentioned first punch 1 to achieve heat exchange.

[0065] The first heat exchange channel 10a can flow a heat exchange medium such as cooling oil, so that the heat exchange medium is in direct contact with the stator core 100 for heat exchange, so that the stator core 100 is in a suitable temperature range, which is beneficial to expand the power density range of the motor applicable to the stator core 100. For example, the stator core 100 can be applicable to motors with high power density. Secondly, the outer peripheral wall of the stator core 100 is formed with a plurality of first heat exchange channels 10a, and the plurality of first heat exchange channels 10a are arranged at intervals along the axial direction of the stator core 100 and each first heat exchange channel 10a extends along the circumferential direction of the stator core 100 respectively, and two adjacent first heat exchange channels 10a are arranged around the stator core 100. The upward offset setting allows the heat exchange medium to flow along the corresponding first heat exchange channel 10a, so as to reduce the probability of turbulence in the heat exchange medium to a certain extent, which is beneficial to reduce the local loss of the heat exchange medium flow under large flow conditions and improve the overall heat exchange efficiency; at the same time, since each first heat exchange channel 10a corresponds to the second side wall 12 of a first punch 1, each first heat exchange channel 10a corresponds to at least a part of the second side wall 12 of a first punch 1, which makes it easier for each first punch 1 to directly contact the heat exchange medium, which is beneficial to increase the heat exchange area between the heat exchange medium and the stator core 100, and is beneficial to improve the heat exchange effect between the heat exchange medium and the stator core 100.

[0066] In addition, the above arrangement of the present application facilitates increasing the contact area between the stator core 100 and the heat exchange medium and improving the heat exchange effect by increasing the distance between the first side wall 11 and the central axis 10c of the first punching sheet 1 to a smaller value.

[0067] It can be seen that in the above scheme, the first punching sheet 1 may include a first part and a second part, the outer peripheral wall of the first part is formed as a first side wall 11, and the outer peripheral wall of the second part is formed as a second side wall 12. Then, in the radial direction of the first punching sheet 1, the first part may be arranged to protrude from the second part, and the first parts of two adjacent first punching sheets 1 are arranged to be staggered along the circumferential direction of the stator core 100; then the first heat exchange channel 10a may be formed by the second part of the corresponding first punching sheet 1 and the first part of the adjacent first punching sheet 1, so that at least part of the second side wall 12 of the corresponding first punching sheet 1 may form the bottom wall of the first heat exchange channel 10a, the adjacent first punching sheet 1 The part of the first part protruding from the second part forms the side wall of the first heat exchange channel 10a; then, for a single first punching sheet 1, its corresponding first heat exchange channel 10a can extend circumferentially into an open ring, and the first heat exchange channel 10a can be formed as a continuously extended channel (for example, the outer peripheral wall of the stator core 100 includes a first side wall 11 and a second side wall 12), or it can be constructed to include a plurality of channel segments arranged at intervals along the circumferential direction (for example, the outer peripheral wall of the stator core 100 includes a plurality of first side walls 11 and a plurality of second side walls 12, and the plurality of first side walls 11 and the plurality of second side walls 12 are alternately arranged one by one along the circumferential direction).

[0068] Among them, the first side walls 11 of two adjacent first punching sheets 1 are staggered along the circumferential direction of the stator core 100, which can be understood as: the orthographic projection of the part of the first part of one of the two adjacent first punching sheets 1 protruding from the second part along the axial direction of the stator core 100 is denoted as the first projection, and the orthographic projection of the part of the first part of the other first punching sheet 1 protruding from the second part along the axial direction of the stator core 100 is denoted as the second projection, a part of the first projection can be located outside the second projection in the circumferential direction of the stator core 100, and another part of the first projection overlaps with the second projection, then the first projection and the second projection partially overlap; or, the first projection is completely located at the second projection. The first projection is outside the outer contour of the projection, and the first projection and the second projection are spaced apart along the circumference of the stator core 100 (for example, the center angles of the first side walls 11 corresponding to two adjacent first punching sheets 1 are both less than 180°, and the two adjacent first punching sheets 1 are offset by 180° in the circumferential direction); or, the first projection is completely outside the outer contour of the second projection, and at least one end of the first projection at the two circumferential ends of the stator core 100 and at least one corresponding end of the second projection at the two circumferential ends of the stator core 100 are arranged without a gap (for example, the center angles of the first side walls 11 corresponding to two adjacent first punching sheets 1 are both 180°, and the two adjacent first punching sheets 1 are offset by 180° in the circumferential direction).

[0069] It is understandable that the heat exchange medium can exchange heat with the stator core 100 to reduce the temperature of the stator core 100 or increase the temperature of the stator core 100, so that the stator core 100 is within a suitable temperature range. For example, the heat exchange medium can absorb the heat of the stator core 100 to prevent the stator core 100 from being in a high temperature state, which is conducive to the normal operation of the motor 300. Of course, for the convenience of the following description, the heat exchange medium and the stator core 100 are exchanged for heat to reduce the temperature of the stator core 100.

[0070] Among them, compared with some technologies, it is necessary to stack multiple structural types of punching sheets in a certain order to form multiple heat exchange flow channels on the outer peripheral wall of the stator core; in the embodiment of the present application, the stator core 100 can be formed by stacking multiple first punching sheets 1 of the same structural type (that is, the structural type is configured such that the outer peripheral wall includes a first side wall 11 and a second side wall 12 arranged in sequence along the circumferential direction, and the distance between the first side wall 11 and the center center line 10c is greater than the distance between the second side wall 12 and the center axis 10c), and two adjacent first punching sheets 1 are staggered along the circumferential direction of the stator core 100 to form multiple heat exchange flow channels on the outer peripheral wall of the stator core 100. A plurality of first heat exchange channels 10a are formed on the peripheral wall; in other words, the stator core 100 of the embodiment of the present application can adopt fewer structural types of punching sheets to meet the heat exchange requirements of each punching sheet while reducing the number of times the punching sheets are switched during the processing of the stator core 100, thereby reducing the process complexity of the stator core 100 during the stacking process. For example, the structures of the plurality of first punching sheets 1 are exactly the same. Then, during the processing of the stator core 100, when the plurality of first punching sheets 1 are stacked, there is no need to switch between punching sheets of different structural types, thereby improving the production rhythm of the stator core 100 and helping to improve the production efficiency of the stator core 100.

[0071] It should be noted that, in the process of stacking the punching sheets of the stator core 100, in order to ensure that the length of the stator core 100 in the axial direction is consistent, the punching sheets need to be rotated by a certain angle to eliminate the processing error of the thickness of the punching sheets, so that the length of the stator core 100 in the axial direction is relatively uniform. Therefore, in an embodiment of the present application, the stator core 100 includes a plurality of first punching sheets 1 stacked in the axial direction, and in the axial direction of the stator core 100, one of two adjacent first punching sheets 1 can be rotated by a certain angle around the central axis 10c of the first punching sheet 1, so that the first side walls 11 of the two adjacent first punching sheets 1 are staggered along the circumference of the stator core 100, so that a plurality of first heat exchange channels 10a are formed on the outer peripheral wall of the stator core 100. It can be seen that in the embodiment of the present application, the processing step of rotating punching sheets can be used to rotate the first punching sheets 1 and stack them to form the stator core 100, so as to improve the uniformity of the axial length of the stator core 100 while realizing the forming of the first heat exchange channel 10a, avoiding the need to add additional processing steps.

[0072] According to the stator core 100 of the embodiment of the utility model, the stator core 100 can include a plurality of first punching sheets 1 of the same structural type stacked and arranged, and two adjacent first punching sheets 1 are staggered along the circumference of the stator core 100 to form a plurality of first heat exchange channels 10a on the outer peripheral wall of the stator core 100. This can improve the uniformity of the axial length of the stator core 100 while reducing the process complexity of the stator core 100 during the stacking process, thereby improving the production cycle and helping to improve the production efficiency of the stator core 100.

[0073] In addition, compared with some technologies in which holes are punched inside the yoke of the stator core to form a heat exchange channel, the embodiment of the present application arranges the first heat exchange channel 10a to be formed on the outer peripheral wall of the stator core 100. The depth of the first heat exchange channel 10a (i.e., the radial size of the first heat exchange channel 10a) can be determined by the radial size of the first side wall 11 and the second side wall 12, and can be flexibly designed without considering the minimum value of the stamping hole process in some of the above-mentioned technologies, thereby reducing the outer diameter of the stator core 100 to a certain extent, and thus reducing the volume of the motor; moreover, compared with the above-mentioned technology, the contact area between the stator core 100 and the heat exchange medium in the embodiment of the present application can increase rapidly with the increase of the axial length of the motor, and then more heat dissipation area is in contact with the heat exchange medium at the same axial length, so that it has a better cooling effect in the motor with a longer axial length.

[0074] Optionally, the outer contours of the plurality of first punching sheets 1 are the same. Of course, in other examples, the outer contours of the plurality of first punching sheets 1 may also be different.

[0075] In the description of this application, "axial direction" can be understood as the axial direction of the stator core 100, that is, the axial direction of the stator core 100. Figure 4 The extension direction of the central axis 10c of the first punching sheet 1 is the axial direction of the first punching sheet 1; "radial direction" can be understood as the radial direction of the stator core 100, that is, the direction passing through the central axis 10c of the first punching sheet 1 on the cross section of the stator core 100. The radial direction of the stator core 100 is perpendicular to the axial direction of the stator core 100, and the cross section of the stator core 100 is perpendicular to the axial direction of the stator core 100; "circumferential direction" can be understood as the circumferential direction of the stator core 100, that is, the circumferential direction around the central axis 10c of the first punching sheet 1, that is, the circumferential direction of the first punching sheet 1. It can be understood that the central axis of the stator core 100 coincides with the central axis 10c of the first punching sheet 1.

[0076] In some embodiments, Figure 2 and Figure 5As shown, the first punching sheet 1 includes a plurality of first sheets 13 stacked along the axial direction of the stator core 100. On a plane perpendicular to the central axis 10c, the outer contours of the orthographic projections of the plurality of first sheets 13 of the first punching sheet 1 completely overlap, that is, the outer contours of the plurality of first sheets 13 of the first punching sheet 1 are the same, and any two adjacent first sheets 13 of the first punching sheet 1 are not misaligned in the circumferential direction of the stator core 100; the first punching sheet 1 can include a plurality of first sheets 13 of the same size stacked and arranged, which is conducive to reducing the cost of the punching sheet mold. Thus, the plurality of first sheets 13 are stacked into the first punching sheet 1, so that the first punching sheet 1 has a suitable thickness to meet the production requirements of the stator core 100, which is conducive to simplifying the production steps of the stator core 100 and improving production efficiency.

[0077] Optionally, when the axial length of the first punching sheet 1 in the stator core 100 is within a suitable range, the above-mentioned length of the first punching sheet can be selected to be a smaller value, so that the width of the first heat exchange channel 10a is within a suitable range while the width of the first heat exchange channel 10a is smaller. Thus, more first heat exchange channels 10a can be formed on the outer peripheral wall of the stator core 100 when the axial length of the stator core 100 is fixed, which can increase the heat exchange area between the stator core 100 and the heat exchange medium to a certain extent, which is beneficial to improving the cooling effect of the heat exchange medium on the stator core 100; secondly, the width of the first heat exchange channel 10a is relatively small, which is convenient for increasing the flow rate of the heat exchange medium in the first heat exchange channel 10a to a certain extent, which is beneficial to improving the heat exchange efficiency between the heat exchange medium and the stator core 100, and can better exert the good heat exchange effect of the heat exchange medium; at the same time, even if the heat exchange medium flow rate of the first heat exchange channel 10a is relatively small, the heat exchange medium can have a suitable flow rate in the first heat exchange channel 10a, which can make the heat exchange medium flow stably along the first heat exchange channel 10a, and ensure the heat exchange effect between the heat exchange medium and the stator core 100.

[0078] In some embodiments, in the axial direction of the stator core 100, the lengths of the plurality of first punching sheets 1 are equal, so as to facilitate the mass production of the first punching sheets 1, which is beneficial to improving the production efficiency of the stator core 100; and / or, in the axial direction of the stator core 100, the length of the first punching sheet 1 is t', 1mm≤t'≤1.5mm, then the axial length of the first heat exchange channel 10a can also be within the range of 1mm to 1.5mm, so that the heat exchange medium can flow at high speed in the heat exchange channel, the thickness of the heat exchange medium boundary layer is small, and even if there is no turbulence in the heat exchange channel, a strong cooling effect can be exerted. Optionally, the length t' of the first punching sheet 1 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm, etc.

[0079] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0080] In some embodiments, Figure 1-Figure 2 and Figure 5 As shown, at least one second heat exchange channel 10b is formed on the outer peripheral wall of the stator core 100, and the second heat exchange channel 10b extends along the axial direction of the stator core 100. The second heat exchange channel 10b is respectively connected to each first heat exchange channel 10a, so that the heat exchange medium can be distributed to multiple first heat exchange channels 10a by the second heat exchange channel 10b, or the heat exchange medium is converged from multiple first heat exchange channels 10a to the second heat exchange channel 10b, thereby facilitating the flow of the heat exchange medium, facilitating the flow of the heat exchange medium between the second heat exchange channel 10b and the first heat exchange channel 10a, facilitating the collection or distribution of the heat exchange medium through the second heat exchange channel 10b, and facilitating the improvement of the circulation efficiency of the heat exchange medium in the first heat exchange channel 10a and the improvement of the heat exchange effect.

[0081] In addition, by setting the second heat exchange channel 10b, the embodiment of the present application does not set a channel breakpoint in the circumferential direction of the stator core 100, which can reduce the turbulence of the heat exchange medium, which is beneficial to reducing the local loss of the heat exchange medium under large flow conditions and improving the overall efficiency of the motor system.

[0082] Exemplarily, on a plane perpendicular to the central axis 10c, with the orthographic projection of the central axis 10c of the first punching sheet 1 as the center of the circle, the outer peripheral wall of the first punching sheet 1 includes a first side wall 11 and a second side wall 12, and in the circumferential direction of the stator core 100, the first side walls 11 of two adjacent first punching sheets 1 are partially staggered in the circumferential direction, for example, the circumferential staggered angle is smaller than the central angle corresponding to the second side wall 12 of the first punching sheet 1, so as to form a second heat exchange channel 10b extending along the axial direction of the stator core 100 on the outer peripheral wall of the stator core 100, and the second heat exchange channel 10b is connected to each first heat exchange channel 10a.

[0083] For example, the outer circumferential wall of the first punching sheet 1 includes a first side wall 11 and a second side wall 12, the central angle corresponding to the first side wall 11 is smaller than the central angle corresponding to the second side wall 12, and in the circumferential direction of the stator core 100, the entire first side walls 11 of two adjacent first punching sheets 1 are offset in the circumferential direction, so that the entire first side walls 11 of two adjacent first punching sheets 1 are spaced apart in the circumferential direction, for example, the circumferential offset angle is larger than the central angle corresponding to the second side wall 12 of the first punching sheet 1 and smaller than the central angle corresponding to the first side wall 11 of the first punching sheet 1, so that either circumferential end of one of the two first side walls 11 is spaced apart from the corresponding end of the other first side wall 11, so as to form two circumferentially spaced second heat exchange channels 10b on the outer circumferential wall of the stator core 100, each second heat exchange channel 10b extends axially and is connected to each first heat exchange channel 10a. In other examples, the outer peripheral wall of the first punching sheet 1 includes a plurality of first side walls 11 and a plurality of second side walls 12 , and the number of the second heat exchange flow channel 10 b may be one or more.

[0084] In some embodiments, Figure 1-Figure 4 As shown, on a plane perpendicular to the central axis 10c, with the orthographic projection of the central axis 10c of the first punching sheet 1 as the center of the circle, the center angle corresponding to the first side wall 11 is smaller than the center angle corresponding to the second side wall 12, the circumferential misalignment angle of two adjacent first punching sheets 1 is larger than the center angle corresponding to the first side wall 11, and the circumferential misalignment angle of two adjacent first punching sheets 1 is smaller than the center angle corresponding to the second side wall 12, so that the second heat exchange flow channel 10b is multiple and the multiple second heat exchange flow channels 10b are arranged at intervals along the circumference of the stator core 100, and the multiple second heat exchange flow channels 10b In cooperation with the multiple connected first heat exchange channels 10a, the heat exchange medium can be distributed from the second heat exchange channel 10b to the multiple first heat exchange channels 10a, or the heat exchange medium can be converged from the multiple first heat exchange channels 10a to the second heat exchange channel 10b, which is convenient for the flow of the heat exchange medium between the first heat exchange channel 10a and the second heat exchange channel 10b, and is beneficial to improving the heat exchange efficiency; one of the second heat exchange channels 10b can be used as an inlet channel, and one of the remaining second heat exchange channels 10b can be used as an outlet channel, which is convenient for the flow path setting of the heat exchange medium.

[0085] For example, in combination Figure 1 and Figure 5The outer peripheral wall of the first punching sheet 1 includes a first side wall 11 and a second side wall 12, the central angle corresponding to the first side wall 11 is smaller than the central angle corresponding to the second side wall 12, and the central angle corresponding to the first side wall 11 is less than 180°, and the central angle corresponding to the second side wall 12 is greater than 180°; when one of the two adjacent first punching sheets 1 is circumferentially displaced by 180° relative to the other (that is, the outer peripheral wall of one of the first punching sheets 1 after rotating 180° around its central axis 10c is located on the same cylindrical surface as the outer peripheral wall of the other first punching sheet 1), two second heat exchange channels 10b are formed on the outer peripheral wall of the stator core 100, and the two second heat exchange channels 10b are opposite to each other in the radial direction of the stator core 100, and each second heat exchange channel 10b is respectively connected to multiple first heat exchange channels 10a. In other examples, the outer peripheral wall of the first punching sheet 1 includes a first side wall 11 and a second side wall 12. In scheme 1, the first projection and the second projection partially overlap. In scheme 2, the first projection is completely outside the outer contour of the second projection, one circumferential end of the first projection and one circumferential end of the second projection are not spaced apart, and the other circumferential end of the first projection and the other circumferential end of the second projection are spaced apart. At this time, the above two schemes can form a second heat exchange channel 10b on the outer peripheral wall of the stator core 100.

[0086] Optionally, when a plurality of second heat exchange channels 10 b are formed on the outer peripheral wall of the stator core 100 , the widths of the plurality of second heat exchange channels 10 b in the circumferential direction of the stator core 100 may be equal or unequal.

[0087] Of course, it can be understood that the outer peripheral wall of the first punching sheet 1 includes multiple first side walls 11 and multiple second side walls 12. In the circumferential direction of the stator core 100, the adjacent first side walls 11 of two adjacent first punching sheets 1 are partially staggered in the circumferential direction. Similarly, multiple second heat exchange channels 10b extending along the axial direction of the stator core 100 can be formed on the outer peripheral wall of the stator core 100, and the second heat exchange channels 10b are connected to each first heat exchange channel 10a.

[0088] In some embodiments, the circumferential offset angle of any two adjacent first punches 1 is 180°, that is, one of any two adjacent first punches 1 is circumferentially offset by 180° relative to the other (for example, among two adjacent first punches 1, one of the first punches 1 is rotated 180° relative to the other first punch 1 around its center axis 10c from a position where the outer contour completely overlaps with the axial direction of the orthographic projection thereof), so as to form a plurality of second heat exchange channels 10b on the outer peripheral wall of the stator core 100.

[0089] For example, combined with Figure 1Two second heat exchange channels 10b are formed on the outer peripheral wall of the stator core 100, and the two second heat exchange channels 10b are arranged opposite to each other. Each second heat exchange channel 10b is connected to multiple first heat exchange channels 10a respectively. The heat exchange medium is distributed from one of the second heat exchange channels 10b to multiple first heat exchange channels 10a. The heat exchange medium flows along the corresponding multiple first heat exchange channels 10a and converges into another second heat exchange channel 10b to complete the flow of the heat exchange medium on the outer peripheral wall of the stator core 100.

[0090] Of course, in other embodiments, the circumferential offset angle of two adjacent first punches 1 can also be other angles besides 180°, for example, the circumferential offset angle is 80°, 90°, 150°, 200°, etc. At this time, the central angle corresponding to the first side wall 11 and the second side wall 12 can be adjusted according to the circumferential offset angle.

[0091] In some embodiments, Figure 1-Figure 4 As shown, the widths of the multiple second heat exchange channels 10b in the circumferential direction of the stator core 100 are equal, so that the flow rates of the heat exchange medium in the multiple second heat exchange channels 10b are basically consistent, which is beneficial to improving the flow stability of the heat exchange medium on the outer wall of the stator core 100, so as to reduce the probability of turbulence of the heat exchange medium in the second heat exchange channels 10b. At the same time, in the subsequent assembly process, the second heat exchange channels 10b can be optionally set corresponding to the corresponding structure (such as the output end or input end of the heat exchange medium). For example, any second heat exchange channel 10b can be connected to the input end of the heat exchange medium, etc., which is beneficial to simplify the assembly process of the motor 300 or the stator core assembly 200.

[0092] In other embodiments of the present application, the outer wall of the stator core 100 may not be formed with the second heat exchange channel 10b. In this case, any two adjacent first heat exchange channels 10a are not connected. When the stator core 100 is used in the motor 300, the motor 300 also includes a shell 201. The stator core 100 is arranged in the shell 201, and the first heat exchange channel 10a is located on the inner side of the shell 201. A plurality of medium inlets and a plurality of medium outlets may be formed on the shell 201, and each first heat exchange channel 10a may correspond to at least one medium inlet and at least one medium outlet.

[0093] In some embodiments, Figure 1 and Figure 5As shown, on a plane perpendicular to the central axis 10c, with the orthographic projection of the central axis 10c of the first punching sheet 1 as the center of the circle, the sum of the central angles corresponding to all the first side walls 11 and the central angles corresponding to all the second side walls 12 is 360°. There is one first side wall 11 and one second side wall 12 respectively; or, there are multiple first side walls 11 and multiple second side walls 12 respectively, and the multiple first side walls 11 and the multiple second side walls 12 are alternately arranged one by one along the circumference of the stator core 100, so that one second side wall 12 is provided between two adjacent first side walls 11, and one first side wall 11 is provided between two adjacent second side walls 12.

[0094] Therefore, each first punching plate 1 has a first side wall 11 and a second side wall 12, and the second side wall 12 of each first punching plate 1 corresponds to a first heat exchange channel 10a. Multiple first punching plates 1 are stacked in sequence in the axial direction of the stator core 100, and zero (that is, no second heat exchange channel 10b is formed on the outer peripheral wall of the stator core 100), one or two second heat exchange channels 10b can be formed on the outer peripheral wall of the stator core 100.

[0095] Optionally, the first side walls 11 of two adjacent first punching sheets 1 are staggered along the circumference of the stator core 100, the central angle corresponding to the first side wall 11 is equal to the central angle corresponding to the second side wall 12, and with the axial direction of the stator core 100 as the projection direction, the projections of the first side walls 11 of two adjacent first punching sheets 1 on the projection plane are in contact with each other, so that a plurality of first heat exchange channels 10a are formed on the outer peripheral wall of the stator core 100, which are spaced apart along the axial direction of the stator core 100 and staggered along the circumference of the stator core 100, each first heat exchange channel 10a corresponds to a second side wall 12, and the circular angle corresponding to the extension length of the first heat exchange channel 10a is 180°.

[0096] Optionally, the first side walls 11 of two adjacent first punching sheets 1 are staggered along the circumference of the stator core 100, and the central angle corresponding to the first side wall 11 is smaller than the central angle corresponding to the second side wall 12, so that a plurality of first heat exchange channels 10a are formed on the outer peripheral wall of the stator core 100, which are arranged at intervals along the axial direction of the stator core 100 and staggered along the circumference of the stator core 100, and one or two second heat exchange channels 10b are also formed on the outer peripheral wall of the stator core 100 and extend along the axial direction of the stator core 100, and the second heat exchange channels 10b connect the plurality of first heat exchange channels 10a.

[0097] For example, combined with Figure 5Taking the case where the central angle corresponding to the first side wall 11 is smaller than the central angle corresponding to the second side wall 12 as an example, the plurality of first punching sheets 1 include a plurality of first punching sheets and a plurality of second punching sheets, and the plurality of first punching sheets and the plurality of second punching sheets are alternately stacked in sequence along the axial direction of the stator core 100, and the second punching sheets are circumferentially rotated 180° relative to the first punching sheets, so that a plurality of first heat exchange channels 10a are formed on the outer peripheral wall of the stator core 100, which are arranged at intervals along the axial direction of the stator core 100 and staggered along the circumferential direction of the stator core 100, and two second heat exchange channels 10b extending along the axial direction of the stator core 100 are also formed on the outer peripheral wall of the stator core 100, and the second heat exchange channels 10b are radially oppositely arranged.

[0098] In some embodiments, Figure 5 As shown, the first side wall 11 and the second side wall 12 are arc-shaped, and the center of the first side wall 11 and the center of the second side wall 12 are both located on the central axis 10c. As a result, the heat exchange channel (such as the first heat exchange channel 10a or the second heat exchange channel 10b) formed by the circumferential staggered two adjacent first punching sheets 1 has a uniform depth in the radial direction of the stator core 100, which is conducive to the heat exchange medium flowing more smoothly in the heat exchange channel, and at the same time facilitates the processing of the first punching sheet 1.

[0099] It can be seen that in the above scheme, the first side wall 11 and the second side wall 12 are respectively located on cylindrical surfaces with different diameters and the central axis 10c as the axis, and the radius of the first side wall 11 is greater than the radius of the second side wall 12. Therefore, the first side walls 11 of two adjacent first punching sheets 1 are staggered along the circumferential direction of the stator core 100, so that a plurality of first heat exchange channels 10a are formed on the outer peripheral wall of the stator core 100, which are spaced apart along the axial direction of the stator core 100 and staggered along the circumferential direction of the stator core 100.

[0100] In some embodiments, Figure 1-Figure 4 and Figure 6 As shown, the stator core 100 also includes a second punching sheet 2, and the second punching sheets 2 are respectively provided at the axial ends of the plurality of first punching sheets 1. The distance between any point on the outer peripheral wall of the second punching sheet 2 and the central axis 10c of the first punching sheet 1 is greater than the distance between the second side wall 12 and the central axis 10c of the first punching sheet 1. Thus, the second punching sheet 2 cooperates with the adjacent first punching sheet 1 to define the first heat exchange flow channel 10a. At the same time, the second punching sheet 2 can at least protect the first side wall 11 of the first punching sheet 1 during transportation or conveying, and can reduce the occurrence of situations such as the first punching sheet 1 being damaged due to contact or collision with other objects.

[0101] It can be seen that among the multiple first punches 1, for the first punch 1 in the middle part, a first heat exchange channel 10a is defined between it and the two adjacent first punches 1, and for the axially outermost first punch 1, a first heat exchange channel 10a is defined between it and the adjacent first punch 1 and second punch 2.

[0102] For example, Figure 1 and Figure 3 As shown, the outer contour of the second punch 2 is circular, and the outer diameter of the second punch 2 is greater than x2, which is convenient for simplifying the processing of the second punch 2; at this time, the center of the circle corresponding to the outer contour of the second punch 2 can be located on the central axis 10c.

[0103] In some embodiments, Figure 1 As shown, the first side wall 11 is an arc surface, and the radius of the first side wall 11 is half of the outer diameter of the second punching sheet 2, that is, the first side wall 11 and the outer peripheral wall of the second punching sheet 2 are located on the same cylindrical surface, then the distance between any point on the outer peripheral wall of the second punching sheet 2 and the central axis 10c of the first punching sheet 1 is equal to the distance between the first side wall 11 and the central axis 10c of the first punching sheet 1, so that the second punching sheet 2 can protect the entire first punching sheet 1, and can prevent the stator core 100 from being deformed and damaged due to collision during transportation or subsequent sample preparation, and at the same time will not cause material waste of the second punching sheet 2.

[0104] In some embodiments, in combination Figure 1 The second punching sheet 2 includes a plurality of second sheets stacked along the axial direction of the stator core 100. On a plane perpendicular to the central axis 10c, the outer contours of the orthographic projections of the plurality of second sheets of the second punching sheet 2 completely overlap. Then, the outer contours of the plurality of second sheets of the second punching sheet 2 are the same, and any two adjacent second sheets of the second punching sheet 2 are not misaligned in the circumferential direction of the stator core 100, thereby facilitating the stacking assembly of the second punching sheets 2, which is beneficial to reducing the process complexity during the stacking process of the stator core 100 and improving production efficiency.

[0105] Of course, in other embodiments of the present application, the second punching sheet 2 may also include a second sheet body.

[0106] In some embodiments, Figure 1 and Figure 2As shown, in the axial direction of the stator core 100, the length of the second punching sheet 2 is greater than the length of the first punching sheet 1, and the length of the second punching sheet 2 is greater than the width of the first heat exchange flow channel 10a, so that the second punching sheet 2 has a greater structural strength, so that the second punching sheet 2 has a greater bearing capacity, so that the second punching sheet 2 can better protect the first punching sheet 1 to avoid damage to the first punching sheet 1; and / or, in the axial direction of the stator core 100, the length of the second punching sheet 2 is t, t≥8mm, so that the second punching sheet 2 is within a suitable length range, so that the second punching sheet 2 has sufficient structural strength to ensure its own structural stability, and can protect the first punching sheet 1. Optionally, the length t of the second punching sheet 2 can be 8mm, 9mm, 10mm, 11mm, 12mm, etc.

[0107] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0108] In some embodiments, Figure 3 and Figure 4 As shown, the second punching sheet 2 is formed with a third heat exchange channel 21 directly or indirectly connected to the first heat exchange channel 10a, so that the heat exchange medium can flow between the first heat exchange channel 10a and the third heat exchange channel 21, so that the heat exchange medium can exchange heat with the corresponding second punching sheet 2 part of the stator core 100, which can increase the heat exchange area between the stator core 100 and the heat exchange medium, which is beneficial to improving the heat exchange efficiency of the stator core 100.

[0109] The third heat exchange flow channel 21 penetrates the side wall of the second punching sheet 2 away from the first punching sheet 1 to form an outlet 2a. The central axis of the outlet 2a is parallel to the central axis 10c of the first punching sheet 1, so that the heat exchange medium at the outlet 2a is suitable for flowing to the stator winding 202 provided in the stator core 100; or, the central axis of the outlet 2a is set at an angle with the central axis 10c of the first punching sheet 1, that is, the central axis of the outlet 2a is at a non-zero angle with the central axis 10c, so that the heat exchange medium at the outlet 2a is suitable for flowing to the stator winding 202 provided in the stator core 100 (for example, the heat exchange medium at the outlet 2a directly flows to the stator winding 202, or is guided to the stator winding 202 by other components). Thus, the heat exchange medium can flow along the third heat exchange channel 21 from the outlet 2a to the end of the stator winding 202 of the stator core 100 (i.e., the part of the stator winding 202 protruding axially from the stator core 100), so that the heat exchange medium contacts the stator winding 202 to exchange heat with the stator winding 202 to cool the stator winding 202.

[0110] Optionally, in the axial direction of the stator core 100 and away from the first punching sheet 1, the central axis of the outlet 2a extends obliquely toward the direction close to the central axis 10c, so that the heat exchange medium flowing out of the outlet 2a can better flow directly toward the end of the stator winding 202, which is convenient for eliminating the need to set other components for guiding the flow of the heat exchange medium (such as the spray piece 3 described later); of course, regardless of whether the central axis of the outlet 2a is parallel to or inclined relative to the central axis 10c, a component for guiding the flow of the heat exchange medium (such as the spray piece 3 described later) can be set at the end of the stator core 100.

[0111] In addition, the central axis of the outlet 2a is set at an angle with the central axis 10c of the first punch 1. At this time, the central axis of the third heat exchange channel 21 can be set at a non-zero angle with the central axis 10c. The second punch 2 can include a plurality of second sheets stacked in sequence along the axial direction, each second sheet having a through opening formed thereon, and the positions of the through openings of the plurality of second sheets are slightly different, so that the through openings of the plurality of second sheets are arranged in sequence along the axial direction to form the third heat exchange channel 21.

[0112] In some embodiments, Figure 1-Figure 6 As shown, at least one second heat exchange channel 10b extending along the axial direction of the stator core 100 is also formed on the outer peripheral wall of the stator core 100, and the second heat exchange channel 10b is respectively connected to each first heat exchange channel 10a, and the third heat exchange channel 21 is connected to the first heat exchange channel 10a through at least one second heat exchange channel 10b, so that the heat exchange medium in the multiple first heat exchange channels 10a can be converged to the second heat exchange channel 10b and then flow to the third heat exchange channel 21, so that the heat exchange medium can flow on the outer peripheral wall of the stator core 100 to exchange heat with the stator core 100. Of course, the heat exchange medium can flow from the third heat exchange channel 21 to the second heat exchange channel 10b and then be divided from the second heat exchange channel 10b to the multiple first heat exchange channels 10a, so that the heat exchange medium flows on the outer peripheral wall of the stator core 100. It can be seen that in the embodiment of the present application, no turbulent structure is provided on the outer peripheral wall of the stator core 100 , so as to simplify the structure of the stator core 100 .

[0113] Optionally, the third heat exchange channel 21 is formed on the outer wall of the second punch 2. On a plane perpendicular to the central axis 10c, with the positive projection of the central axis 10c of the first punch 1 as the center of the circle, the central angle corresponding to the third heat exchange channel 21 is β, β>0, so that the heat exchange medium can flow between the second heat exchange channel 10b and the third heat exchange channel 21, for example, the heat exchange medium in the second heat exchange channel 10b can flow to the third heat exchange channel 21.

[0114] Optionally, the central angle corresponding to the second heat exchange channel 10b is equal to the central angle corresponding to the third heat exchange channel 21, that is, it can be understood that the width of the second heat exchange channel 10b in the circumferential direction of the stator core 100 is equal to the width of the third heat exchange channel 21 in the circumferential direction of the stator core 100, so as to facilitate the smoothness of the flow between the second heat exchange channel 10b and the third heat exchange channel 21, so as to avoid the appearance of corners at the matching position of the second heat exchange channel 10b and the third heat exchange channel 21, which may affect the flow rate of the heat exchange medium.

[0115] For example, combined with Figure 5-Figure 6 , the central angle corresponding to the first side wall 11 is θ1, the central angle corresponding to the second side wall 12 is θ2, the central angle corresponding to the third heat exchange flow channel 21 is β, and in the circumferential direction of the first punch 1, the central angle corresponding to one end of the first side wall 11 and the preset straight line is α, wherein the outer contour shape of the first punch 1 is an axisymmetric figure, the symmetry axis 1a is a straight line that is axisymmetric to the outer contour shape of the first punch 1, the symmetry axis 1a is perpendicular to the central axis 10c, and the preset straight line is perpendicular to the symmetry axis 1a and the central axis 10c respectively, then θ1+θ2=360°, θ2-θ1=2α>0, 2α=β. Thus, when one of any two adjacent first punching sheets 1 is circumferentially offset by 180° relative to the other, two second heat exchange channels 10b are formed on the outer peripheral wall of the stator core 100, and the two second heat exchange channels 10b are opposite to each other in the radial direction of the stator core 100, and each second heat exchange channel 10b is respectively connected to multiple first heat exchange channels 10a, and second punching sheets 2 are respectively provided on the axial sides of the multiple first punching sheets 1, and each second punching sheet 2 is formed with a third heat exchange channel 21, and the two third heat exchange channels 21 are respectively connected to the axial ends of one of the second heat exchange channels 10b, so that the heat exchange medium can converge from the multiple first heat exchange channels 10a into one of the above-mentioned second heat exchange channels 10b and be divided into the two third heat exchange channels 21, so that while realizing the cooling of each second punching sheet 2, the heat exchange medium can flow from the third heat exchange channel 21 to other positions (for example, to the spray part 3 described later) for cooling, which is beneficial to the cooling area of ​​the cooling medium and improves the cooling effect.

[0116] In some embodiments, in combination Figure 3 and Figure 4 The third heat exchange channel 21 is formed on the outer peripheral wall of the second punching sheet 2 or the third heat exchange channel 21 is formed inside the second punching sheet 2. Therefore, the design of the third heat exchange channel 21 has a variety of structures to meet the needs of the stator core 100, which can improve the applicability of the stator core 100.

[0117] It can be understood that when the outer contour of the second punch 2 is circular, if the third flow channel 21 is formed inside the second punch 2, the third flow channel 21 has basically no effect on the outer contour of the second punch 2; when the outer contour of the second punch 2 is circular, if the third flow channel 21 is formed on the outer peripheral wall of the second punch 2, the third flow channel 21 has a certain effect on the outer contour of the second punch 2, and at this time, the outer contour of the second punch 2 except for the part at the first flow channel 21 is located on the circle.

[0118] The stator core assembly 200 according to the second embodiment of the utility model comprises a stator winding 202 and a stator core 100 according to the first embodiment of the utility model, wherein the stator winding 202 is arranged on the stator core 100 and the axial ends of the stator winding 202 are respectively protruded from the stator core 100. The axial direction of the stator winding 202 is the axial direction of the stator core 100.

[0119] According to the stator core assembly 200 of the embodiment of the present invention, the heat exchange effect of the stator core assembly 200 can be improved by adopting the above-mentioned stator core 100 .

[0120] The motor according to the embodiment of the third aspect of the utility model comprises the stator core assembly 200 according to the embodiment of the second aspect of the utility model.

[0121] According to the motor 300 of the embodiment of the present invention, the heat exchange effect of the motor 300 can be improved by adopting the above-mentioned stator core assembly 200.

[0122] It can be understood that the motor 300 further includes a rotor, and the rotor can be arranged radially inside the stator core 100 .

[0123] In some embodiments, Figure 8 As shown, the motor 300 further includes a spray member 3, and the spray members 3 are respectively provided at the axial ends of the stator core 100, and the spray member 3 is formed with a spray channel 31 and a spray hole 32 connected to the spray channel 31, and the spray channel 31 is directly or indirectly connected to the first heat exchange channel 10a, and the spray hole 32 is formed on the inner peripheral wall of the spray member 3, so that the heat exchange medium at the spray hole 32 is suitable for flowing to the stator winding 202 provided in the stator core 100. Therefore, the heat exchange medium in the first heat exchange channel 10a can flow to the spray channel 31 after heat exchange with the stator core 100, so that the heat exchange medium can be sprayed from the spray hole 32 to the stator winding 202, so that the heat exchange medium can fully contact with the stator winding 202, so that the heat exchange medium can better exchange heat with the stator winding 202, which is conducive to improving the heat exchange effect of the stator core assembly 200.

[0124] In some embodiments, Figure 8As shown, the spray member 3 is formed into an annular structure, and a plurality of spray holes 32 are arranged at intervals along the circumferential direction and / or axial direction of the spray member 3. Then, the plurality of spray holes 32 are arranged at intervals along the circumferential direction of the spray member 3. For example, the plurality of spray holes 32 can surround the stator winding 202 in one circle, so that the stator winding 202 can fully contact the heat exchange medium in one circle, thereby improving the heat exchange effect on the stator winding 202; or, the plurality of spray holes 32 are arranged at intervals along the axial direction of the spray member 3, so that the plurality of spray holes 32 are correspondingly arranged in the axial direction of the stator winding 202, so that the stator winding 202 can be in the axial direction of the stator winding 202. Contact with more heat exchange medium is beneficial to improve the heat exchange effect of the stator winding 202; or, multiple spray holes 32 are arranged at intervals along the circumferential and axial directions of the spray part 3, and multiple spray holes 32 arranged at intervals along the circumferential direction of the spray part 3 constitute a spray hole group, and there are multiple spray hole groups, and multiple spray hole groups are arranged at intervals along the axial direction of the spray part 3, so that multiple spray holes 32 are arranged in the axial direction and circumferential direction of the stator winding 202 respectively, so that the stator winding 202 can contact with more heat exchange medium in the axial direction and circumferential direction of the stator winding 202, which is beneficial to the heat exchange effect of the stator winding 202. Among them, the axial direction of the stator winding 202 and the axial direction of the spray part 3 are both the axial direction of the first punching plate 1.

[0125] Thus, the spraying member 3 can increase the spraying range of the heat exchange medium sprayed toward the stator core 100 through the multiple spraying holes 32 , for example, it is convenient to realize that the spraying member 3 has no spraying breakpoints in the circumferential direction, which is beneficial to improving the heat exchange efficiency of the stator core assembly 200 .

[0126] Optionally, in the axial direction of the stator core 100, for the same axial end of the stator core 100, the distance between the spray hole 32 of the corresponding spray piece 3 and the end face of the above-mentioned axial end of the stator core 100 is smaller than the distance between the corresponding axial end of the stator winding 202 and the end face of the above-mentioned axial end of the stator core 100, that is, the distance between the spray hole 32 and the end face of the above-mentioned axial end of the stator core 100 is smaller than the length of the stator winding 202 extending out of the stator core 100, so that the heat exchange medium sprayed from the spray hole 32 is fully in contact with the end of the stator winding 202, thereby increasing the contact area between the heat exchange medium and the end of the stator winding 202, and facilitating improving the heat exchange effect between the heat exchange medium and the stator winding 202.

[0127] In some embodiments, the spray channel 31 is connected to the first heat exchange channel 10a through the third heat exchange channel 21. The third heat exchange channel 21 is one. When the heat exchange medium has a low flow rate, it is convenient to improve the situation where the heat exchange medium is distributed to the end of the stator winding 202 without completely cooling the stator core 100, so as to take into account the cooling of the stator core 100 and the stator winding 202.

[0128] In some embodiments, in combination Fig.10The motor 300 further includes a housing 201, which has an installation cavity 201a. The stator core 100 is disposed in the installation cavity 201a. The housing 201 can close the radially outer open side of the first heat exchange channel 10a, so that the heat exchange medium flows circumferentially in the first heat exchange channel 10a. A medium inlet and a medium outlet are formed on the housing 201. The medium inlet is connected to the first heat exchange channel 10a, and the medium outlet is connected to the installation cavity 201a.

[0129] Optionally, the motor 300 adopts the above-mentioned stator core assembly 200, and the spray element 3 is fixed (for example, by snap fit or interference fit) to the housing 201 or the stator core 100 (for example, on one axial end of the stator core 100).

[0130] For example, in Figure 1 , Figure 3 and Figure 8-Figure 9 In the example, the motor 300 includes a stator core 100, a stator winding 202, a housing 201 and two spray parts 3, the stator winding 202 is arranged on the stator core 100 and the axial ends of the stator winding 202 are respectively protruded from the stator core 100, the two spray parts 3 are arranged at the axial ends of the stator core 100, each spray part 3 is arranged on the radial outside of the stator winding 202, the housing 201 has an installation cavity 201a, the stator core 100, the stator winding 202 and the spray parts 3 are arranged in the installation cavity 201a, the housing 201 is formed with a medium inlet and a medium outlet, the motor 300 also includes an input pipe 203, and the input pipe 203 is connected to the medium inlet.

[0131] The outer peripheral wall of the stator core 100 is formed with a plurality of first heat exchange channels 10a, two second heat exchange channels 10b and two third heat exchange channels 21. The plurality of first heat exchange channels 10a are arranged at intervals along the axial direction of the stator core 100, and two adjacent first heat exchange channels 10a are arranged at offsets along the circumferential direction of the stator core 100. Each first heat exchange channel 10a extends approximately half of a circle of the outer peripheral wall of the stator core 100 along the circumferential direction of the stator core 100, and each second heat exchange channel 10b extends approximately half of a circle of the outer peripheral wall of the stator core 100. The heat exchange channels 10b extend along the axial direction of the stator core 100, the two second heat exchange channels 10b are arranged opposite to each other in the radial direction of the stator core 100, each second heat exchange channel 10b is connected with all the first heat exchange channels 10a respectively, the two third heat exchange channels 21 are respectively located at the two ends of one of the second heat exchange channels 10b in the axial direction of the stator core 100, and are respectively connected with one of the second heat exchange channels 10b, and the other second heat exchange channel 10b is connected with the medium inlet.

[0132] A spray member 3 is installed at each axial end of the stator core 100. The spray member 3 is formed into an annular structure. The spray member 3 is formed with an annular spray channel 31 and a plurality of spray holes 32 connected to the spray channel 31. The plurality of spray holes 32 are evenly spaced along the circumference of the spray member 3. An outlet 2a is formed at one end of the two third heat exchange channels 21 away from each other. The outlet 2a is connected to the spray channel 31 at the corresponding axial end.

[0133] Thus, the heat exchange medium is driven by a driving device such as a high-pressure pump to flow from the input pipe 203 to the medium inlet and into the above-mentioned another second heat exchange channel 10b. The heat exchange medium is divided from the above-mentioned another second heat exchange channel 10b to multiple first heat exchange channels 10a on both sides of the circumference thereof. The heat exchange medium converges along the corresponding first heat exchange channel 10a to one of the above-mentioned second heat exchange channels 10b. Then, the heat exchange medium is distributed from the second heat exchange channel 10b to flow to the third heat exchange channel 21 on both sides of the axial direction, and flows from the outlet 2a to the spray channel 31. The heat exchange medium flows around the spray channel 31 and is sprayed from the corresponding spray hole 32 to the end of the stator winding 202. Finally, the heat exchange medium flows down from the end of the stator winding 202 and flows out of the housing 201 from the medium outlet to complete the circulation flow. It can be seen that the flow of the heat exchange medium is unidirectional, so that when the heat exchange medium has a low flow rate, the heat exchange medium can also flow along the above-mentioned heat exchange path, so as to fully exchange heat with the stator core 100 and the stator winding 202, thereby meeting the heat exchange requirements of the motor 300 under low flow conditions.

[0134] The power assembly according to the fourth aspect of the present invention comprises the motor according to the third aspect of the present invention.

[0135] According to the power assembly of the embodiment of the utility model, the performance of the power assembly can be improved by adopting the above-mentioned motor.

[0136] The vehicle according to the fifth aspect of the present invention comprises the powertrain according to the fourth aspect of the present invention or the motor according to the third aspect of the present invention.

[0137] According to the vehicle of the embodiment of the utility model, the performance of the vehicle can be improved by adopting the above-mentioned power assembly or motor.

[0138] In the description of the present utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0139] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0140] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0141] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator core, characterized in that: The stator core includes a plurality of first punching sheets stacked in sequence along the axial direction of the stator core, the outer peripheral wall of the first punching sheet includes a first side wall and a second side wall sequentially arranged along the circumferential direction of the stator core, the distance between the first side wall and the central axis of the first punching sheet is x1, the distance between the second side wall and the central axis of the first punching sheet is x2, x1 is greater than x2, and the outer peripheral wall of the first punching sheet is arranged around the central axis of the first punching sheet, The first side walls of two adjacent first punching sheets are staggered along the circumference of the stator core, so that a plurality of first heat exchange channels are formed on the outer circumferential wall of the stator core, which are arranged at intervals along the axial direction of the stator core and staggered along the circumference of the stator core, and each of the first heat exchange channels extends along the circumference of the stator core and corresponds to the second side wall of a first punching sheet.

2. The stator core according to claim 1, characterized in that: The first punching sheet includes a plurality of first sheet bodies stacked along the axial direction of the stator core, and on a plane perpendicular to the central axis, the orthographic outer contours of the plurality of first sheet bodies of the first punching sheet completely overlap.

3. The stator core according to claim 1, characterized in that: In the axial direction of the stator core, the lengths of the plurality of first punching sheets are equal; and / or, In the axial direction of the stator core, the length of the first punching sheet is t', 1mm≤t'≤1.5mm.

4. The stator core according to claim 1, characterized in that: At least one second heat exchange channel extending along the axial direction of the stator core is also formed on the outer peripheral wall of the stator core, and the second heat exchange channel is respectively connected to each of the first heat exchange channels.

5. The stator core according to claim 4, characterized in that: On a plane perpendicular to the central axis, with the orthographic projection of the central axis of the first punching sheet as the center of the circle, the central angle corresponding to the first side wall is smaller than the central angle corresponding to the second side wall, and the circumferential misalignment angle of two adjacent first punching sheets is larger than the central angle corresponding to the first side wall and smaller than the central angle corresponding to the second side wall, so that the second heat exchange flow channels are multiple and are arranged at circumferential intervals along the stator core.

6. The stator core according to claim 5, characterized in that: The circumferential misalignment angle between any two adjacent first punching sheets is 180°.

7. The stator core according to claim 5, characterized in that: The widths of the plurality of second heat exchange channels in the circumferential direction of the stator core are equal.

8. The stator core according to any one of claims 1 to 7, characterized in that: On a plane perpendicular to the central axis, with the orthographic projection of the central axis of the first punching sheet as the center of the circle, the sum of the central angles corresponding to all the first side walls and the central angles corresponding to all the second side walls is 360°, The first side wall and the second side wall are each one; or, There are a plurality of the first side walls and a plurality of the second side walls, and the plurality of the first side walls and the plurality of the second side walls are alternately arranged one by one along the circumferential direction of the stator core.

9. The stator core according to claim 8, characterized in that: The first side wall and the second side wall are arc-shaped respectively, and the centers of the first side wall and the second side wall are both located on the central axis.

10. The stator core according to claim 8, characterized in that: The stator core further includes a second punching sheet, and the second punching sheets are respectively provided at both axial ends of the plurality of first punching sheets, the outer contour of the second punching sheet is circular, and the outer diameter of the second punching sheet is greater than x2.

11. The stator core according to claim 10, characterized in that: The first side wall is an arc surface, and the radius of the first side wall is half of the outer diameter of the second punching sheet.

12. The stator core according to claim 10, characterized in that: The second punching sheet includes a plurality of second sheet bodies stacked in the axial direction of the stator core, and on a plane perpendicular to the central axis, the outer contours of the orthographic projections of the plurality of second sheet bodies of the second punching sheet completely overlap.

13. The stator core according to claim 10, characterized in that: In the axial direction of the stator core, the length of the second punching sheet is greater than the length of the first punching sheet; and / or, In the axial direction of the stator core, the length of the second punching sheet is t, and t≥8mm.

14. The stator core according to claim 10, characterized in that: The second punching sheet is formed with a third heat exchange channel that is directly or indirectly connected to the first heat exchange channel, and the third heat exchange channel penetrates a side wall of the second punching sheet that is away from the first punching sheet to form an outlet. Wherein, the central axis of the outlet is parallel to the central axis of the first punching sheet, so that the heat exchange medium at the outlet is suitable for flowing to the stator winding provided in the stator core; or, The central axis of the outlet is arranged at an angle with the central axis of the first punching sheet, so that the heat exchange medium at the outlet is suitable for flowing to the stator winding arranged in the stator core.

15. The stator core according to claim 14, characterized in that: At least one second heat exchange channel extending along the axial direction of the stator core is also formed on the outer peripheral wall of the stator core, and the second heat exchange channel is connected to each of the first heat exchange channels respectively, and the third heat exchange channel is connected to the first heat exchange channel through at least one of the second heat exchange channels.

16. The stator core according to claim 14, characterized in that: The third heat exchange channel is formed on the outer peripheral wall of the second punching plate or inside the second punching plate.

17. A stator core assembly, characterized in that: It comprises a stator winding and a stator core according to any one of claims 1 to 16, wherein the stator winding is arranged on the stator core and the axial ends of the stator winding are respectively protruded from the stator core.

18. A motor, characterized in that: Comprising the stator core assembly according to claim 17.

19. The electric machine according to claim 18, characterized in that It also includes a spray part, which is respectively provided at the axial ends of the stator core, and is formed with a spray flow channel and a spray hole connected to the spray flow channel. The spray flow channel is directly or indirectly connected to the first heat exchange flow channel, and the spray hole is formed on the inner circumferential wall of the spray part so that the heat exchange medium at the spray hole is suitable for flowing to the stator winding.

20. The electric machine according to claim 19, characterized in that The spray member is formed into an annular structure, and a plurality of the spray holes are arranged at intervals along the circumferential direction and / or axial direction of the spray member.

21. The electric machine according to any one of claims 18 to 20, characterized in that: It also includes a shell, which has an installation cavity. The stator core is arranged in the installation cavity. A medium inlet and a medium outlet are formed on the shell. The medium inlet is connected to the first heat exchange flow channel, and the medium outlet is connected to the installation cavity.

22. A powertrain, characterized in that: Comprising an electric machine according to any one of claims 18-21.

23. A vehicle, characterized in that: The method comprises the powertrain according to claim 22 or the electric machine according to any one of claims 18 to 21.

Images