Stator assembly, motor and vehicle

Abstract

The present invention discloses a stator assembly, a motor and a vehicle. The stator assembly includes: a stator core, the stator core has a stator flow channel inside, the stator core includes: a first core segment and a second core segment, the first core segment has a core groove radially recessed from the surface of the first core segment, the second core segment has a core cooling hole axially penetrating the second core segment, and the core groove is connected with the adjacent core cooling hole to form the stator flow channel. When the stator assembly is applied to the motor, the inner wall of the motor casing does not need to be provided with an oil channel, so that the casing strength is good and the wall thickness does not need to be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator assembly, a motor having the stator assembly, and a vehicle having the motor. Background Art

[0002] The motor generally includes a casing, a front cover, a rear cover, a stator core, a stator winding, a rotating shaft, a front bearing, and a rear bearing. The stator core is arranged in the casing, the stator winding is arranged on the stator core, the front cover and the rear cover are arranged at both ends of the casing, the front bearing is arranged in the front cover body, the rear bearing is arranged in the rear cover body, and the rotating shaft is passed through the front bearing and the rear bearing.

[0003] Some existing oil-cooled motors have serpentine grooves on the inner surface of the casing, and an oil inlet and an oil collecting groove are provided at the bottom of the casing. The oil inlet is not connected to the oil collecting groove, but is connected to the serpentine groove. The outer wall of the stator core is in close contact with the inner surface of the casing, so that the serpentine groove is closed, and the cooling oil entering from the oil inlet rises along the serpentine groove to the top of the casing. However, this increases the thickness of the casing wall and the size of the motor, which is not conducive to improving the density of the motor. The slotting of the casing will also reduce the structural stiffness of the motor and deteriorate the NVN performance of the motor. Summary of the invention

[0004] The present invention aims to solve one of the above-mentioned technical problems in the prior art at least to a certain extent. To this end, the present invention provides a stator assembly having a stator flow channel for circulating a cooling medium.

[0005] The present invention also provides a motor having the stator assembly.

[0006] The present invention further provides a vehicle having the motor.

[0007] A stator assembly according to an embodiment of the present invention includes: a stator core, the interior of the stator core has a stator flow channel, the stator core includes: a first core segment and a second core segment, the first core segment has a core groove radially recessed from the surface of the first core segment, the second core segment has a core cooling hole axially extending through the second core segment, and the core groove is connected to adjacent core cooling holes to form the stator flow channel.

[0008] According to the stator assembly of the embodiment of the present invention, the stator core has a stator flow channel, so when the stator assembly is used in a motor, it is not necessary to open an oil channel on the inner wall of the motor casing, which can ensure good casing strength without increasing the wall thickness.

[0009] According to some embodiments of the present invention, the first core segments and the second core segments are arranged alternately.

[0010] According to some embodiments of the present invention, the first core segment includes at least one first core, and the second core segment includes multiple second cores, the multiple second cores have the same structure, and the multiple second cores are stacked in such a way that the core cooling holes are aligned.

[0011] Optionally, the first core segment includes a plurality of first cores, the plurality of first cores have the same structure, and the plurality of first cores are stacked in a manner that the core grooves are aligned.

[0012] According to some embodiments of the present invention, the core groove of one of the first core segments is configured as an oil inlet end of the stator flow channel.

[0013] Further, the opening direction of the core groove at the oil inlet end is configured to be vertically upward.

[0014] According to some embodiments of the present invention, the iron core cooling holes are provided on both sides of the oil inlet end, and the first iron core segment of the oil inlet end is constructed to include a plurality of first iron cores.

[0015] According to some embodiments of the present invention, the core cooling hole is provided only on one side of the oil inlet end, and the first core segment of the oil inlet end is constructed to include a monolithic first core.

[0016] According to some embodiments of the present invention, the core cooling hole includes: a first cooling hole and a second cooling hole, the first cooling hole and the second cooling hole are both long arc holes, and the first adjacent parts and the second adjacent parts of the first cooling hole and the second cooling hole are separated by separating ribs.

[0017] Furthermore, the core cooling hole has an inner wall surface close to the axis of the second core segment and an outer wall surface away from the axis of the second core segment, the bottom surface of the core groove is lower than the outer wall surface of the core cooling hole, and the circumferential width of the core groove is greater than the circumferential width of the dividing rib.

[0018] According to some embodiments of the present invention, the first core segments are arranged on both sides of each of the second core segments, and the middle portion of the dividing ribs at the first adjacent portions of the second core segments is opposite to the middle portion of the core groove of the first core segment on one side, and the middle portion of the dividing ribs at the second adjacent portions of the second core segments is opposite to the middle portion of the core groove of the first core segment on the other side.

[0019] According to some embodiments of the present invention, there are multiple first core segments, and the multiple first core segments are alternately arranged in a manner that the opening directions of the core grooves differ by 180°.

[0020] According to some embodiments of the present invention, the stator assembly further includes: a stator winding and an oil guide ring, the stator winding is wound on the stator core, the oil guide ring is arranged at the end of the stator core, and the oil guide ring is adjacent to the first core segment at the end of the stator core, and the oil guide ring is used to guide the cooling medium of the stator flow channel to the end of the stator winding.

[0021] Furthermore, the oil guide ring is sleeved on the periphery of the stator winding, and an oil guide hole is opened on the oil guide ring, one end of the oil guide hole is connected to the stator flow channel, and the other end of the oil guide hole faces the stator winding.

[0022] According to the second aspect of the present invention, the motor comprises: a casing, on which an oil inlet is provided; the above-mentioned stator assembly, wherein the stator assembly is arranged in the casing, and the outer surface of the stator core is in contact with the inner wall of the casing, and the oil inlet end of the stator flow channel is connected to the oil inlet.

[0023] Furthermore, the casing is provided with an oil outlet hole, and the oil outlet hole is used to guide the cooling medium flowing through the stator winding to the outside of the casing.

[0024] According to the motor of the embodiment of the present invention, the cooling channel (i.e., the stator channel) is arranged on the stator core. When the cooling medium flows in the stator channel, it can fully contact with the stator core to cool the stator assembly, which has the advantages of high cooling efficiency and uniform heat dissipation. The uniformity of the motor casing structure is also maintained, which is conducive to improving the motor stiffness and making the motor NVH performance better. Compared with setting the cooling channel on the casing, the casing needs to be subjected to more complex mechanical processing, which obviously increases the cost. The present invention sets the cooling channel on the stator core. The manufacture of the stator core is to punch silicon steel strips into laminations by dies and then stack them. The channel is set on the stator core. It only needs to change the shape of the die to flexibly design various channel configurations. The processing is simple, and the manufacturing cost of the core is almost not increased. It also simplifies the processing of the casing and reduces the cost of the casing.

[0025] A vehicle according to an embodiment of the third aspect of the present invention comprises the above-mentioned motor.

[0026] The advantages of the vehicle and the above-mentioned motor over the prior art are the same and will not be described in detail here.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of a stator assembly according to an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of a first core segment according to an embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of a second core segment according to an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of assembling a stator core according to an embodiment of the present invention;

[0032] Figure 5 is an exploded schematic diagram of a stator core according to an embodiment of the present invention;

[0033] Figure 6 is a schematic diagram of a stator core according to another embodiment of the present invention;

[0034] Figure 7 is a schematic diagram of an oil guide ring according to an embodiment of the present invention;

[0035] Figure 8 is a cross-sectional schematic diagram of a motor according to an embodiment of the present invention;

[0036] Fig. 9 is a schematic diagram of a housing according to an embodiment of the present invention;

[0037] Fig.10 is a schematic diagram of a vehicle according to an embodiment of the present invention.

[0038] Reference numerals:

[0039] Vehicle 1000, motor 100, bearing 1, front end cover 2, stator winding 3, oil guide ring 4, oil guide hole 41, oil guide circular hole 411, oil guide long hole 412, oil retaining flange 413, oil guide ring body 414, casing 5, casing inner wall 51, oil inlet hole 52, oil outlet hole 53, rear end cover 6, stator core 7, first core segment 71, core groove 711, outer surface 712 of the first core segment, first wire groove 713, second core segment 72, outer surface 721 of the second core segment, core cooling hole 722, outer wall surface 7221, inner wall surface 7222, first cooling hole 7223, second cooling hole 7224, dividing rib 723, second wire groove 724, oil inlet end 73, rotor 8. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Combine the following Figure 1-Figure 10 A stator assembly, a motor 100 and a vehicle according to embodiments of the present invention are described in detail.

[0045] Reference Figure 1 , Figure 8 As shown, the stator assembly according to the embodiment of the present invention may include: a stator core 7 .

[0046] The stator core 7 has a stator flow channel inside, and the cooling medium is suitable for flowing in the stator flow channel to more fully cool the stator assembly.

[0047] In some embodiments of the present invention, reference Figure 2-Figure 6As shown, the stator core 7 may include: a first core segment 71 and a second core segment 72, the first core segment 71 and the second core segment 72 have the same outer diameters, the first core segment 71 has a core groove 711 radially recessed from the surface of the first core segment 71, in other words, the core groove 711 may be formed by slotting the outer surface 712 of the first core segment 71, and the number of the core groove 711 on each first core segment 71 may be one. The second core segment 72 has a core cooling hole 722 that penetrates the axial direction of the second core segment 72, in other words, the core cooling hole 722 may be formed by opening a through hole in the thickness direction of the second core segment 72, and the number of the core cooling holes 722 on each second core segment 72 may be one or more (e.g., two).

[0048] The core groove 711 is connected to the adjacent core cooling hole 722 to form a stator flow channel. In other words, the core groove 711 and the core cooling hole 722 are combined to form a stator flow channel. The stator flow channel is completely inside the stator core 7, so that the cooling medium in the stator flow channel is in full contact with the stator core 7, which has the advantages of high cooling efficiency and uniform heat dissipation. However, it is difficult to achieve that the flow channel is completely arranged inside the stator core 7 in the prior art.

[0049] Optionally, the cooling medium may be water, oil, gas, etc.

[0050] According to the stator assembly of the embodiment of the present invention, the stator core 7 has a stator flow channel, and the cooling medium can fully contact the stator core 7 when circulating in the stator flow channel to cool the stator assembly, which has the advantages of high cooling efficiency and uniform heat dissipation. When the stator assembly is applied to the motor 100, the inner wall 51 of the housing of the motor 100 does not need to be provided with an oil channel, and the processing difficulty and manufacturing cost of the housing 5 do not need to be increased. At the same time, the strength and rigidity of the housing 5 can be ensured to be good and the wall thickness does not need to be increased. In this way, the volume of the motor 100 does not need to be increased, and the NVH performance of the motor 100 will not be deteriorated.

[0051] The first core segments 71 and the second core segments 72 are arranged alternately. The first core segments 71 and the second core segments 72 can be manufactured separately and then stacked together, or they can be manufactured continuously on a punch press and then stacked together.

[0052] The stator assembly of the embodiment of the present invention is simple and practical, and can flexibly form various stator flow channel configurations by simply changing the shape of the core segment without excessively changing the structure of other components (such as the housing 5 of the motor 100). In addition, there is no limit on the number of the first core segment 71 and the second core segment 72, and the increase or decrease of the first core segment 71 and the second core segment 72 is very flexible and easy to implement.

[0053] The first core segment 71 includes at least one first core, and the second core segment 72 includes multiple second cores. The multiple second cores have the same structure and are stacked in a manner that the core cooling holes 722 are aligned.

[0054] For example, in the present invention Figure 1 , Figure 4-Figure 5 In the illustrated embodiment, the first core segment 71 includes a plurality of first cores having the same structure and being stacked in a manner that the core grooves 711 are aligned, that is, the core grooves 711 on each first core are facing each other to form a complete core groove 711; the second core segment 72 includes a plurality of second cores having the same structure and being stacked in a manner that the core cooling holes 722 are aligned, that is, the core cooling holes 722 on each second core are facing each other to form a complete core cooling hole 722.

[0055] Optionally, the core groove 711 of a first core segment 71 is configured as the oil inlet end 73 of the stator flow channel. Figure 5 As shown, the core groove 711 of the middle first core segment 71 is constructed as the oil inlet end 73 of the stator flow channel, which is conducive to making the path of the cooling medium reaching the front and rear ends of the stator winding 3 as long as possible, so as to make the cooling more uniform. If it is constrained by the structure, the oil inlet end 73 cannot be set in the middle, but can also be set in the middle position close to the first end or the second end, but the length of the oil path reaching the first end and the first end of the stator winding 3 is different. The cooling medium flows to both ends of the stator core 7, fully taking away the heat of the stator core 7. The core groove 711 plays the role of oil passing, and guides the cooling medium in the core cooling hole 722 into the core cooling hole 722 of the adjacent core.

[0056] The opening direction of the core groove 711 constructed as the oil inlet end 73 is vertically upward. Therefore, when the cooling medium enters the stator flow channel through the oil inlet end 73, the cooling medium can enter the stator flow channel more easily under the action of gravity and is not easy to leak.

[0057] In the present invention Figure 6 In the illustrated embodiment, the first core segment 71 includes a single first core; the second core segment 72 includes multiple second cores, which have the same structure and are stacked in a manner such that the core cooling holes 722 are aligned.

[0058] Optionally, refer to Figure 5 As shown, core cooling holes 722 are provided on both sides of the oil inlet end 73, and the first core segment 71 configured as the oil inlet end 73 includes a plurality of first cores.

[0059] Optionally, refer to Figure 6As shown, only one side of the oil inlet end 73 is provided with a core cooling hole 722, and the first core segment 71 configured as the oil inlet end 73 includes a single first core. The core groove 711 of the first core segment 71 at the end is configured as the oil inlet end 73 of the stator flow channel.

[0060] That is to say, the thickness of the first core segment 71 and the second core segment 72 can be determined according to the actual situation. Since the cooling medium mainly passes through the second core segment 72, the thickness of the second core segment 72 can be designed to be slightly thicker. The contact area between the cooling medium and the first core segment 71 is small, so the thickness of the first core segment 71 can be thinner. The thinnest one can be composed of a single punching sheet, such as Figure 6 As shown, the oil inlet end 73 can be set at the positions of the two ends of the stator core 7.

[0061] In some embodiments of the present invention, the first core and the second core may be formed by stamping silicon steel sheets, so that when the local structures of the first core and the second core are changed, the manufacturing cost will not be significantly increased. When multiple cores are stacked, a riveting process may be used (for example, rivets are provided between the stacked sheets), or a welding, bonding, or other process may be used.

[0062] In the present invention Figure 3 In the illustrated embodiment, the core cooling hole 722 may include: a first cooling hole 7223 and a second cooling hole 7224, both of which are long arc-shaped holes, and the first adjacent portion and the second adjacent portion of the first cooling hole 7223 and the second cooling hole 7224 are separated by a separation rib 723. For example, the upper adjacent portions of the first cooling hole 7223 and the second cooling hole 7224 are separated by an upper separation rib, and the lower adjacent portions of the first cooling hole 7223 and the second cooling hole 7224 are separated by a lower separation rib. The width of the separation rib 723 can be reasonably designed according to the structural strength requirements of the stator core 7. Under the condition of ensuring sufficient strength, in order to increase the contact area between the cooling medium and the stator core 7, the width of the separation rib 723 can be reduced as much as possible.

[0063] In addition, an upper dividing rib is provided at the adjacent upper ends of the first cooling hole 7223 and the second cooling hole 7224, and a lower dividing rib is provided at the adjacent lower ends of the first cooling hole 7223 and the second cooling hole 7224, so that the strength of the second core segment 72 is not reduced too much. At the same time, the length of the first cooling hole 7223 and the second cooling hole 7224 is reduced, which is conducive to the cooling medium filling in the corresponding cooling holes. Compared with one cooling hole, the first cooling hole 7223 and the second cooling hole 7224 are provided, so that the cooling medium can better fill each cooling hole.

[0064] Reference Figure 3As shown, the first cooling hole 7223 and the second cooling hole 7224 are located on the same circle surrounding the axis of the second core segment 72, thereby simplifying the hole-opening process of the core cooling hole 722.

[0065] Specifically, the core cooling hole 722 has an outer wall surface 7221 away from the axis of the second core segment 72 and an inner wall surface 7222 close to the axis of the second core segment 72. The bottom surface 7111 of the core groove 711 is lower than the outer wall surface 7221 of the core cooling hole 722, wherein the bottom surface 7111 of the core groove 711 is the surface of the core groove 711 closest to the axis of the first core segment 71, so that the cooling medium of the core groove 711 can flow into the core cooling hole 722. In order to reduce the flow resistance, the bottom surface 7111 of the core groove 711 is usually flush with the inner wall surface 7222 of the core cooling hole 722, or the bottom surface 7111 of the core groove 711 is lower than the inner wall surface 7222 of the core cooling hole 722. In addition, the width of the core groove 711 needs to be reasonably designed based on the principle of reducing the flow resistance of the flow channel and increasing the contact surface between the cooling medium and the stator core 7. The shape of the core groove 711 is not limited, and a plurality of small grooves can be combined into a groove group. In addition, the circumferential width of the core groove 711 is greater than the circumferential width of the separation rib 723, thereby ensuring that when the core groove 711 is facing the separation rib 723, the cooling medium in the core groove 711 can flow into the first cooling hole 7223 and the second cooling hole 7224 at the same time.

[0066] Optionally, refer to Figure 4-Figure 6 As shown, the first core segments 71 are arranged on both sides of each second core segment 72, and the middle part of the dividing rib 723 at the first adjacent part of the second core segment 72 is opposite to the middle part of the core groove 711 of the first core segment 71 on one side, and the middle part of the dividing rib 723 at the second adjacent part of the second core segment 72 is opposite to the middle part of the core groove 711 of the first core segment 71 on the other side. In other words, the middle part of the dividing rib 723 is opposite to the middle part of the adjacent core groove 711.

[0067] Specifically, the stator core 7 is composed of a first core segment 71 and a second core segment 72, the first core segment 71 and the second core segment 72 are stacked in sequence, the center line of the core groove 711 of the first core segment 71 is opposite to the center line of the dividing rib 723 of the second core segment 72, and the plurality of first core segments 71 are opposite to the upper dividing rib and the lower dividing rib of the second core segment 72 in sequence, that is, the core groove 711 of the first first core segment 71 is opposite to the upper dividing rib of the first second core segment 72, and the core groove 711 of the second first core segment 71 is opposite to the upper dividing rib of the second core segment 72. 711 is directly opposite to the lower dividing rib of the first second core segment 72, and the core groove 711 of the third first core segment 71 is directly opposite to the upper dividing rib of the second second core segment 72. The first core segments 71 and the second core segments 72 are arranged in sequence according to this rule. For example, in some embodiments, starting from one end of the stator core 7, the core groove 711 of the odd-numbered first core segment 71 is directly opposite to the upper dividing rib of the second core segment 72, and the core groove 711 of the even-numbered first core segment 71 is aligned with the lower dividing rib of the second core segment 72. In this way, the coolant in the core groove 711 can be evenly divided into two paths and flow into the core cooling holes 722 on both sides of the dividing rib 723. Figure 5 The arrows shown illustrate the flow direction of the cooling medium.

[0068] Reference Figure 5 As shown, there are multiple first core segments 71, and the multiple first core segments 71 are alternately arranged in a manner that the opening directions of the core grooves 711 are 180 degrees apart. In this way, when the cooling medium enters the core groove 711 of a first core segment 71, that is, through the oil inlet end 73, the cooling medium is further divided by the upper dividing rib of the adjacent second core segment 72 and then enters the core cooling hole 722, and then flows into another first core segment 71 from the core groove 711 directly opposite to the lower dividing rib of the second core segment 72, and then further enters the core cooling hole 722 of another second core segment 72 after being divided by the lower dividing rib of the second core segment 72.

[0069] The stator assembly further includes: a stator winding 3, which is wound on the stator core 7. For example, the center of the stator core 7 has a through hole, and a wire slot is opened on the hole wall of the through hole, and the stator winding 3 is embedded in the wire slot. Figure 8 As shown, the stator winding 3 protrudes outward from at least one end of the stator core 7 .

[0070] like Figure 2-Figure 3 As shown, the inner circumference of the first core segment 71 is provided with a first wire slot 713 , the inner circumference of the second core segment 72 is provided with a second wire slot 724 , the first wire slot 713 is aligned with the second wire slot 724 , and the stator winding 3 is suitable for being embedded in the first wire slot 713 and the second wire slot 724 .

[0071] Reference Figure 1 , Figure 8As shown, the stator assembly also includes: an oil guide ring 4, which is arranged at the end of the stator core 7, and the oil guide ring 4 is adjacent to the first core segment 71 at the end of the stator core 7, and the oil guide ring 4 is used to guide the cooling medium of the stator flow channel to the end of the stator winding 3, so that the cooling medium can further cool the stator winding 3 after cooling the stator core 7.

[0072] Reference Figure 8 As shown, the oil guide ring 4 is sleeved on the periphery of the stator winding 3, and an oil guide hole 41 is opened on the oil guide ring 4. One end of the oil guide hole 41 is in close contact with the stator core 7 and communicated with the stator flow channel. The other end of the oil guide hole 41 faces the stator winding 3. The oil guide ring 4 guides the cooling medium passing through the stator core 7 to the end of the stator winding 3, playing a role in cooling the end of the stator winding 3. For details, refer to Figure 7 As shown, the oil guide hole 41 may include an oil guide circular hole 411 and an oil guide long hole 412, and the oil guide ring 4 includes: an oil guide ring body 414 and an oil retaining flange 413, the oil guide ring body 414 is in close contact with the stator core 7, and the oil retaining flange 413 is located at one end of the oil guide ring body 414 away from the stator core 7. When the cooling medium of the stator flow channel reaches the outer peripheral surface of the oil guide ring 4, the cooling medium can be transported to the stator winding 3 through the oil guide hole 41, and the oil retaining flange 413 plays a role of enclosing the cooling medium, thereby guiding the cooling medium to flow to the stator winding 3 through the oil guide hole 41, so as to improve the utilization rate of the cooling medium.

[0073] Reference Figure 8-Figure 9 As shown, the motor 100 according to the second embodiment of the present invention includes: a casing 5 and the stator assembly of the above embodiment, the motor 100 also includes a rotor 8, a bearing 1, a front end cover 2, and a rear end cover 6, the front end cover 2 and the rear end cover 6 are arranged at both ends of the casing, the bearing 1 is arranged in the casing 5, and is used to support the rotating shaft, and the rotor 8 is suitable for rotating synchronously with the rotating shaft.

[0074] The housing 5 is provided with an oil inlet hole 52, the stator assembly is arranged in the housing 5, and the outer surface of the stator core 7 is in contact with the housing inner wall 51 of the housing 5, and the oil inlet end 73 of the stator flow channel is communicated with the oil inlet hole 52. Specifically, the outer surface 712 of the first core segment 71 is in contact with the housing inner wall 51 of the housing 5, and the outer surface 721 of the second core segment 72 is in contact with the housing inner wall 51 of the housing 5. The housing inner wall 51 has a very simple structure and can be composed of a single cylindrical surface and some simple positioning surfaces, which is easy to process and manufacture. Compared with the housing 5 with a cooling flow channel, it can greatly save material costs and processing costs.

[0075] Optionally, the diameter of the outer surface 712 of the first core segment 71 is equal to the diameter of the outer surface 721 of the second core segment 72, so that the outer surface of the stator core 7 maintains a relatively complete cylindrical surface, which can ensure that the stator core 7 is easier to fix in the casing 5 and maintain good mechanical strength.

[0076] Optionally, the outer surface of the stator core 7 and the inner wall 51 of the casing 5 are interference fit, which can reduce the oil leakage between the stator core 7 and the inner wall 51 of the casing. In some optional embodiments, the outer surface of the stator core 7 and the inner wall 51 of the casing 5 can also be a transition fit or a clearance fit.

[0077] When the cooling medium is introduced into the stator flow channel, the motor 100 becomes an oil-cooled motor, which has the advantages of rapid heat dissipation and uniform cooling, and can quickly cool the parts of the motor 100 (such as the ends of the stator winding 3, the bearing 1, etc.). Of course, in some other embodiments, other cooling media can also be introduced into the stator flow channel.

[0078] Furthermore, the housing 5 is provided with an oil outlet hole 53 , and the oil outlet hole 53 is used to guide the cooling medium flowing through the stator winding 3 to the outside of the housing 5 .

[0079] Optionally, the number of the oil inlet hole 52 may be one, and the number of the oil outlet holes 53 may be one or more (eg, two).

[0080] According to the motor 100 of the embodiment of the present invention, the cooling channel (i.e., the stator channel) is arranged on the stator core 7. When the cooling medium circulates in the stator channel, it can fully contact with the stator core 7 to cool the stator assembly, which has the advantages of high cooling efficiency and uniform heat dissipation. The uniformity of the structure of the motor housing 5 of the motor 100 is also maintained, which is conducive to improving the rigidity of the motor 100 and making the NVH performance of the motor 100 better. Compared with arranging the cooling channel on the housing 5, the housing 5 needs to be processed more complicatedly, which obviously increases the cost. The present invention arranges the cooling channel on the stator core 7. The manufacturing of the stator core 7 is to punch the silicon steel strip into laminations by a die and then stack them. The channel is arranged on the stator core 7. It only needs to change the shape of the die to flexibly design various channel configurations. The processing is simple, and the manufacturing cost of the core is almost not increased. In addition, the processing of the housing 5 is simplified, and the cost of the housing 5 is reduced.

[0081] Optionally, the motor 100 may be any motor including a permanent magnet synchronous motor and a three-phase asynchronous motor.

[0082] Reference Fig.10 As shown, a vehicle 1000 according to an embodiment of the third aspect of the present invention comprises the motor 100 of the above-mentioned embodiment.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. 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 present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0084] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A stator assembly, characterized in that: include: A stator core (7), wherein the stator core (7) has a stator flow channel inside, and the stator core (7) comprises: a first core segment (71) and a second core segment (72), wherein the first core segment (71) has a core groove (711) radially recessed from the surface of the first core segment (71), and the second core segment (72) has a core cooling hole (722) penetrating the second core segment (72) in the axial direction, and the core groove (711) is connected to an adjacent core cooling hole (722) to form the stator flow channel; The core cooling hole (722) comprises: a first cooling hole (7223) and a second cooling hole (7224), wherein the first cooling hole (7223) and the second cooling hole (7224) are both long arc-shaped holes, and a first adjacent portion and a second adjacent portion of the first cooling hole (7223) and the second cooling hole (7224) are separated by a separation rib (723); The core cooling hole (722) has an inner wall surface (7222) close to the axis of the second core segment (72) and an outer wall surface (7221) away from the axis of the second core segment (72); the bottom surface of the core groove (711) is lower than the outer wall surface (7221) of the core cooling hole (722); and the circumferential width of the core groove (711) is greater than the circumferential width of the dividing rib (723).

2. The stator assembly according to claim 1, characterized in that The first core segments (71) and the second core segments (72) are arranged alternately.

3. The stator assembly according to claim 2, characterized in that: The first core segment (71) includes at least one first core, and the second core segment (72) includes multiple second cores, the multiple second cores have the same structure, and the multiple second cores are stacked in a manner such that the core cooling holes (722) are aligned.

4. The stator assembly according to claim 3, characterized in that: The first iron core segment (71) comprises a plurality of first iron cores, the plurality of first iron cores have the same structure, and the plurality of first iron cores are stacked in a manner such that the iron core grooves (711) are aligned.

5. The stator assembly according to claim 3, characterized in that: The core groove (711) of one of the first core segments (71) is configured as an oil inlet end (73) of the stator flow channel.

6. The stator assembly according to claim 5, characterized in that The opening direction of the core groove (711) configured as the oil inlet end (73) is vertically upward.

7. The stator assembly according to claim 5, characterized in that The iron core cooling holes (722) are arranged on both sides of the oil inlet end (73), and the first iron core segment (71) of the oil inlet end (73) is constructed to include a plurality of first iron cores.

8. The stator assembly according to claim 5, characterized in that The core cooling hole (722) is provided only on one side of the oil inlet end (73), and the first core segment (71) of the oil inlet end (73) is constructed to include a single-piece first core.

9. The stator assembly according to claim 1, characterized in that: The first core segments (71) are arranged on both sides of each of the second core segments (72), and the middle part of the dividing rib (723) at the first adjacent part of the second core segment (72) is opposite to the middle part of the core groove (711) of the first core segment (71) on one side, and the middle part of the dividing rib (723) at the second adjacent part of the second core segment (72) is opposite to the middle part of the core groove (711) of the first core segment (71) on the other side.

10. The stator assembly according to claim 2, characterized in that There are a plurality of first core segments (71), and the plurality of first core segments (71) are alternately arranged in a manner such that the opening directions of the core grooves (711) are sequentially different by 180°.

11. The stator assembly according to claim 1, characterized in that Also includes: A stator winding (3) and an oil guide ring (4), wherein the stator winding (3) is wound on the stator core (7), the oil guide ring (4) is arranged at the end of the stator core (7), and the oil guide ring (4) is adjacent to the first core segment (71) at the end of the stator core (7), and the oil guide ring (4) is used to guide the cooling medium of the stator flow channel to the end of the stator winding (3).

12. The stator assembly according to claim 11, characterized in that The oil guide ring (4) is sleeved on the periphery of the stator winding (3), and an oil guide hole (41) is provided on the oil guide ring (4), one end of the oil guide hole (41) is communicated with the stator flow channel, and the other end of the oil guide hole (41) faces the stator winding (3).

13. A motor, characterized in that: include: A casing (5), wherein the casing (5) is provided with an oil inlet hole (52); The stator assembly according to any one of claims 1 to 12, wherein the stator assembly is arranged in the casing (5), and the outer surface of the stator core (7) is in contact with the casing inner wall (51) of the casing (5), and the oil inlet end (73) of the stator flow channel is connected to the oil inlet hole (52).

14. The motor according to claim 13, characterized in that The stator assembly further comprises a stator winding (3) and an oil guide ring (4), wherein the stator winding (3) is wound on the stator core (7), the oil guide ring (4) is arranged at the end of the stator core (7), and the oil guide ring (4) is adjacent to the first core segment (71) at the end of the stator core (7), the oil guide ring (4) is used to guide the cooling medium of the stator flow channel to the end of the stator winding (3), and the housing (5) is also provided with an oil outlet hole (53), and the oil outlet hole (53) is used to guide the cooling medium flowing through the stator winding (3) to the outside of the housing (5).

15. A vehicle, characterized in that: A motor comprising any one of claims 13-14.

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