Stator core and motor

Abstract

The utility model discloses a stator iron core, comprising a first iron core part which is provided with a first oil inlet channel and a first oil outlet channel, the first oil inlet channel extends along the radial direction and is communicated with the first oil outlet channel, and the first oil outlet channel comprises a plurality of first oil outlet branches; the second iron core part is arranged on the two opposite sides of the first iron core part, the second iron core part is provided with a second oil outlet channel, the second oil outlet channel communicates with the first oil outlet channel, the second oil outlet channel comprises a plurality of second oil outlet branches, and the multiple first oil outlet branches correspondingly communicate with the multiple second oil outlet branches; the third iron core part and the first iron core part are arranged on the two opposite sides of the second iron core part, and each third iron core part comprises a third oil outlet channel and an oil outlet hole; one end of the third oil outlet channel is communicated with the second oil outlet channel, and the other end of the third oil outlet channel is communicated with the oil outlet hole. The cooling device can improve the cooling effect, save materials and reduce the production cost. The utility model also provides a motor comprising the stator core.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stator core, especially relates to a stator core and motor. BACKGROUND

[0002] The existing motor cooling design scheme is through the axial direct current of stator core and increases the oil ring structure to cool the iron core and winding. However, since the radial outside of the iron core in the existing design scheme uses more material and the additional oil ring structure increases the material cost, the assembly process of the existing motor cooling design scheme is more complex, the material cost is high, and since the oil ring structure needs to be additionally arranged, the oil ring occupies a large space and the cooling is not uniform, so the cooling effect is poor. SUMMARY

[0003] The utility model discloses a kind of stator core and motor, which can effectively improve the cooling effect of stator core, save material, reduce production cost.

[0004] To solve the above technical problems, the embodiment of the utility model discloses a kind of stator core, comprising: first iron core part, with first oil inlet channel and first oil outlet channel, the first oil inlet channel extends along the radial direction of the stator core, and is communicated with the first oil outlet channel, the first oil outlet channel includes a plurality of first oil outlet branch that communicates with each other;Second iron core part, along the axial direction of the stator core, the second iron core part is located on the opposite sides of the first iron core part, the second iron core part has second oil outlet channel, the second oil outlet channel is communicated with the first oil inlet channel, the second oil outlet channel includes a plurality of second oil outlet branch that communicates with each other, a plurality of first oil outlet branch and a plurality of second oil outlet branch are communicated correspondingly;Third iron core part, along the axial direction, the third iron core part and the first iron core part are located on the opposite sides of the second iron core part, the third iron core part includes third oil outlet channel and oil outlet hole;Along the axial direction, one end of the third oil outlet channel is communicated with the second oil outlet channel, and the other end of the third oil outlet channel is communicated with the oil outlet hole.

[0005] According to the technical scheme, the oil passage is designed to allow the cooling oil to enter the stator core from the first core part and the second core part through the first oil inlet channel, and the cooling oil entering the stator core is discharged from the oil outlet hole through the first oil outlet channel, the second oil outlet channel and the third oil outlet channel extending in the axial direction, so as to cool the stator core of the motor. In addition, the first oil outlet branch and the second oil outlet branch of the first oil outlet channel and the second oil outlet channel are used to convert one oil passage into multiple oil passages, so as to slow down the flow rate of the cooling oil by changing the flow direction of the cooling oil, so that the cooling oil can continuously contact the stator core when flowing in the multiple first oil outlet branches and the multiple second oil outlet branches, and the heat conduction efficiency of the stator core is enhanced.

[0006] In addition, the stator core cooling design scheme can reduce the oil passage design on the outer side of the stator core in the stator assembly cooling level, compared with the existing oil ring and other part designs. The first oil outlet branch and the second oil outlet branch of the first oil outlet channel and the second oil outlet channel are used to convert one oil passage into multiple oil passages, which saves material costs, simplifies production processes, and effectively improves the cooling effect of the stator core.

[0007] According to another specific embodiment of the present application, the embodiment of the present application discloses a stator core, the structure of the multiple first oil outlet branches and the structure of the multiple second oil outlet branches are the same, and each includes a radial branch and a circumferential branch; the radial branch extends along the radial direction and along the circumferential direction of the stator core, and the circumferential branch is arranged on the opposite sides of the radial branch.

[0008] According to the technical scheme, the radial branch and the circumferential branch in the multiple first oil outlet branches and the multiple second oil outlet branches can change the flow direction of the cooling oil, convert one oil passage into multiple oil passages, so that the cooling oil can continuously contact the middle part of the stator core, and the heat conduction efficiency of the middle part and the cooling oil is enhanced.

[0009] According to another specific embodiment of the present application, the embodiment of the present application discloses a stator core, the circumferential branch includes a first extension section and a second extension section, the first extension section is arranged at an angle with the radial branch, the second extension section extends along the radial direction and along the circumferential direction, and the second extension section is arranged at intervals with the radial branch.

[0010] According to another specific embodiment of the present application, the embodiment of the present application discloses a kind of stator core, the first oil outlet channel extends along the axial direction, the second oil outlet channel extends along the axial direction;The first core part includes a plurality of the first oil outlet channel and a plurality of the first oil inlet channel, along the circumferential direction of the stator core, the plurality of first oil outlet channel is spaced apart in the first core part, and it is communicated with the plurality of first oil inlet channel corresponding;The second core part includes a plurality of the second oil outlet channel, along the circumferential direction, the plurality of second oil outlet channel is spaced apart in the second core part, and it is communicated with the plurality of first oil outlet channel corresponding.

[0011] According to another specific embodiment of the present application, the embodiment of the present application discloses a kind of stator core, the third core part includes a plurality of the third oil outlet channel and a plurality of the oil outlet hole, along the circumferential direction of the stator core, the plurality of third oil outlet channel is spaced apart in the third core part, and it is communicated with the plurality of oil outlet hole corresponding, the plurality of third oil outlet channel and a plurality of the second oil outlet channel are communicated corresponding.

[0012] According to another specific embodiment of the present application, the embodiment of the present application discloses a kind of stator core, the plurality of third oil outlet channel and any one of the plurality of second oil outlet branch in each second oil outlet channel corresponding.

[0013] According to another specific embodiment of the present application, the embodiment of the present application discloses a kind of stator core, the plurality of third oil outlet channel and the plurality of second oil outlet branch of each second oil outlet channel corresponding.

[0014] According to another specific embodiment of the present application, the embodiment of the present application discloses a kind of stator core, the first core part includes a plurality of first core punching sheet along the axial direction stacked arrangement;The circumferential direction of each the core punching sheet is spaced apart and is provided with a plurality of first oil outlet through hole, each the first oil outlet through hole includes opening and a plurality of first oil outlet branch through hole, the opening is arranged in the circumferential edge of the first core punching sheet, along the radial direction, the plurality of first oil outlet branch through hole is arranged in the side of the circumferential edge away from the opening;The first oil outlet through hole of a plurality of the first core punching sheet is formed each the first oil outlet channel corresponding through in the axial direction, the opening of a plurality of the first core punching sheet is formed each the first oil inlet channel corresponding through in the axial direction, and the plurality of first oil outlet branch through hole of the first oil outlet through hole of a plurality of the first core punching sheet is formed the plurality of first oil outlet branch of each the first oil outlet channel corresponding through in the axial direction.

[0015] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a stator core, each of the second core parts includes a plurality of second core punchings stacked along the axial direction; each of the second core punchings is provided with a plurality of second oil outlet holes at circumferential intervals, and each of the second oil outlet holes includes a plurality of second oil outlet branch holes; each of the second oil outlet holes of the plurality of second core punchings is correspondingly penetrated along the axial direction to form each second oil outlet channel, and the plurality of second oil outlet branch holes of each of the second oil outlet holes of the plurality of second core punchings is correspondingly penetrated along the axial direction to form the plurality of second oil outlet branches of each second oil outlet channel.

[0016] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a stator core, each of the third core parts includes a plurality of third core punchings stacked along the axial direction; each of the third core punchings is provided with a plurality of third oil outlet holes at circumferential intervals; each of the third oil outlet holes of the plurality of third core punchings is correspondingly connected along the axial direction to form each third oil outlet channel.

[0017] An embodiment of the present utility model also discloses an electric motor, comprising: a housing, the housing being provided with an oil inlet; the stator core described in any one of the possible embodiments above, the stator core being arranged inside the housing, and along the radial direction, the first core portion and the housing being spaced apart, the second core portion and the third core portion being sealed and connected to the housing, and jointly defining a second oil inlet channel with the housing, the second oil inlet channel being arranged around the stator core along the circumference of the stator core; the oil inlet being connected to the second oil inlet channel, and the second oil inlet channel being connected to the first oil inlet channel.

[0018] By adopting the above technical solution, the cooling oil can enter the second oil inlet channel through the oil inlet of the shell. The second oil inlet channel extends circumferentially and is connected with multiple first oil inlet channels, so that the cooling oil in the second oil inlet channel can flow into the multiple first oil inlet channels arranged at intervals along the circumferential direction, and then enter the first core part, the second core part and the third core part of the stator core in sequence from the first oil inlet channel to cool the stator core. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1A A cross-sectional view 1 of the motor of the present invention is shown;

[0020] FIG. 1B Show FIG. 1A A partial enlarged view of area A in the middle;

[0021] FIG. 1C A partial cross-sectional view of the stator core of the present invention is shown;

[0022] FIG. 2 A perspective view of a stator core of the utility model is shown;

[0023] FIG. 3 A perspective view of a stator core of the utility model is shown;

[0024] FIG. 4 A perspective view of a stator core of the utility model is shown;

[0025] FIG. 5 A perspective view of a stator core of the utility model is shown;

[0026] FIG. 6A A perspective view of a stator core of the utility model is shown;

[0027] FIG. 6B A perspective view of a stator core of the utility model is shown. DETAILED DESCRIPTION

[0028] The specific embodiments will be described in the following by specific embodiments, and other advantages and effects of the utility model can be easily understood by those skilled in the art from the content disclosed in the specification. Although the description of the utility model will be introduced together with the preferred embodiments, this does not mean that the features of the utility model are limited to the embodiments. On the contrary, the purpose of introducing the utility model together with the embodiments is to cover other options or modifications that can be extended based on the claims of the utility model. In order to provide a deep understanding of the utility model, many specific details will be included in the following description. The utility model can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the utility model, some specific details will be omitted in the description. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0029] It should be noted that in the specification, similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0030] In the description of the embodiments, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0031] The terms "first", "second", etc. are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the embodiments, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments can be understood according to the specific circumstances.

[0033] In order to make the purpose, technical scheme and advantages of the utility model clearer, the embodiments of the utility model will be described in further detail below with reference to the drawings.

[0034] Reference FIGS. 1A-3 , the application provides a motor 1, comprising: a shell 11 and a stator core 2. Wherein, the stator core 2 is arranged in the inside of the shell 11.

[0035] Specifically, as shown in FIG. 1A , the shell 11 is provided with an oil inlet 111, and the oil inlet 111 extends along the radial direction of the stator core 2 (as shown in FIG. 1A Y direction). Exemplarily, as shown in FIG. 1A , the shell 11 further comprises an oil outlet 112, and the oil inlet 111 and the oil outlet 112 are respectively arranged on the upper and lower sides of the stator core 2 along the radial direction Y. Wherein, the number of the oil outlet 112 includes two, and the two oil outlets 112 are arranged at intervals along the axial direction X. But the application embodiments do not make specific limitation to the setting position and number of the oil inlet 111 and the oil outlet 112, as long as the oil inlet 111 can be communicated with the first oil inlet channel 211 described below. For example, the number of the oil inlet 111 can also be two, three, four or more, and the number of the oil outlet 112 can also be one, three, four or more. Exemplarily, the shell 11 of the application embodiment further comprises a shaft hole 13, which is arranged on both sides of the shell 11 along the axial direction X, so that the rotor (not shown in the figure) can pass through.

[0036] Continuing to refer to FIG. 1A and FIG. 1B and combining FIG. 3 , the above-mentioned stator core 2 comprises an intermediate part 20 and an end part 21. Wherein, the intermediate part 20 comprises a first core part 201 and a second core part 202, and the end part 21 comprises a third core part 203.

[0037] Specifically, as shown in FIG. 1A , FIG. 1B andFIG. 3 As shown in FIG, along the axial direction X, the end portions 21 of the stator core 2 are arranged on opposite sides of the middle portion 20, and the first core portion 201 has a first oil inlet channel 211. FIG. 1A As shown in the Y direction, part of the middle portion 20 (i.e., the first core portion 201) is spaced apart from the inner wall of the housing 11, and the end portion 21 and another portion of the middle portion 20 (i.e., the second core portion 202 and the third core portion 203) are sealed and connected to the housing 11, so that the outer peripheral surface of the second core portion 202 and the inner wall of the housing 11 jointly define a second oil inlet channel 212, and the second oil inlet channel 212 is connected to the oil inlet port 111 and the first oil inlet channel 211 of the housing 11, respectively, so that the cooling oil can enter the second oil inlet channel 212 located inside the housing 11 from the outside of the motor 1 through the oil inlet port 111, and enter the middle portion 20 from the second oil inlet channel 212 through the first oil inlet channel 211, thereby cooling the middle portion 20 and the end portion 21 of the stator core 2. For example, as FIG. 1A As shown, the second oil inlet channel 212 is along the circumferential direction R of the stator core 2 (see FIG. 1C ) extending groove; but not limited to this, the embodiment of the present application does not specifically limit the structure of the second oil inlet channel 212.

[0038] refer to FIG. 1B and combined FIG. 1A The middle portion 20 further includes a first oil outlet channel 221 and a second oil outlet channel 222. The first oil inlet channel 211 extends along the radial direction Y of the stator core 2 and is connected to the first oil outlet channel 221. The end portion 21 includes a third oil outlet channel 223 and an oil outlet hole 224. The third oil outlet channel 223 is provided inside the end portion 21 and extends in the axial direction (e.g., FIG. 1B (shown in the X direction), the second oil outlet channel 222 and the oil outlet hole 224 are respectively provided on opposite sides of the third oil outlet channel 223. That is, along the axial direction X, one end 22301 of the third oil outlet channel 223 is connected to the second oil outlet channel 222, and the other end 22302 of the third oil outlet channel 223 is connected to the oil outlet hole 224. For example, FIG. 1A As shown in FIG, along the axial direction X, the oil outlet hole 224 of the embodiment of the present application is provided on the side of the end portion 21 away from the middle portion 20, so that the cooling oil entering the first oil outlet channel 221 and the second oil outlet channel 222 can pass through the third oil outlet channel 223 and then be ejected from the oil outlet hole 224 (that is, the direction of the cooling oil is: a→b→c→d→e, as shown in FIG). FIG. 1B (shown by the dotted line with an arrow in the middle) to cool down other components of the stator core 2, such as the winding (not shown in the figure).

[0039] FIG. 1C A partial cross-sectional view of the stator core 2 according to an embodiment of the present application is shown.

[0040] Reference is made to FIG. 1C and FIG. 2 in combination with FIG. 1A , FIG. 1B and FIG. 3 , the first oil outlet passage 221 of the first core portion 201 of the intermediate portion 20 includes a plurality of first oil outlet branches 225, the second oil outlet passage 222 of the second core portion 202 includes a plurality of second oil outlet branches 226, and the first oil outlet branches 225 and the second oil outlet branches 226 both extend along the axial direction X. Moreover, the plurality of first oil outlet branches 225 of the first oil outlet passage 221 and the plurality of second oil outlet branches 226 of the second oil outlet passage 222 are in corresponding communication. Exemplarily, the structure of the plurality of first oil outlet branches 225 and the structure of the plurality of second oil outlet branches 226 are the same.

[0041] Specifically, as shown in FIG. 1C , the plurality of first oil outlet branches 225 are cross arranged, and one end of each first oil outlet branch 225 converges at the first oil outlet passage 221, so that the plurality of oil outlet branches 225 are in communication with each other through the first oil outlet passage 221. Exemplarily, the plurality of first oil outlet branches 225 and the plurality of second oil outlet branches 226 both include a radial branch 2251 and a circumferential branch 2252 in communication with each other. Wherein, along the circumferential direction of the stator core 2 (as shown by the R direction in FIG. 1C , two circumferential branches 2252 are arranged on the opposite sides of the radial branch 2251 relative to the radial branch 2251, and the radial branch 2251 extends along the radial direction Y.

[0042] It should be noted that the distribution position of the plurality of first oil outlet branches 225 (or the plurality of second oil outlet branches 226) is not limited in the embodiments of the present application, FIG. 1C three first oil outlet branches 225 are cross arranged and in communication with each other; but not limited thereto, as long as the plurality of first oil outlet branches 225 (or the plurality of second oil outlet branches 226) can be in communication with each other, so as to convert one oil passage into multiple oil passages.

[0043] Continuing to refer to FIG. 1C , the circumferential branch 2252 described above includes a first extension section 22521 and a second extension section 22522. Exemplarily, the first extension section 22521 is cross arranged with the radial branch 2251 at an acute angle (as shown by α in FIG. 1C ), and the second extension section 22522 extends along the radial direction Y. Moreover, the second extension section 22522 is arranged at intervals with the radial branch 2251 along the circumferential direction R.

[0044] Thus, in the embodiment of the present application, the oil passage is designed such that cooling oil enters the stator core 2 from the middle portion 20 through the first oil inlet passage 211 and the second oil inlet passage 212, and the cooling oil entering the stator core 2 is discharged from the oil outlet hole 224 through the first oil outlet passage 221, the second oil outlet passage 222, and the third oil outlet passage 223 extending along the axial direction X, thereby cooling the stator core 2 of the motor 1. Furthermore, a single oil passage is converted into multiple oil passages through the multiple first oil outlet branches 225 of the first oil outlet passage 221 and the multiple second oil outlet branches 226 of the second oil outlet passage 222. This reduces the flow rate of the cooling oil by changing its flow direction, allowing the cooling oil to continuously contact the stator core 2 while flowing through the multiple first oil outlet branches 225 and the multiple second oil outlet branches 226, thereby enhancing the heat transfer efficiency with the stator core 2.

[0045] In addition, the cooling design scheme of the stator core 2 of the embodiment of the present application can reduce the oil channel design on the circumferential outer side of the stator core 2 in the cooling level of the stator assembly. Compared with the existing design of parts such as oil rings, the embodiment of the present application converts one oil channel into multiple oil channels through multiple first oil outlet branches 225 of the first oil outlet channel 221 and multiple second oil outlet branches of the second oil outlet channel 222, thereby saving material costs, simplifying the production process, and effectively improving the cooling effect of the stator core 2.

[0046] It should be noted that the embodiment of the present application does not limit the number and structure of the multiple first oil outlet branches 225 (or the second oil outlet branches 226), and can be specifically configured according to actual conditions. For example, the number of the multiple first oil outlet branches 225 (or the second oil outlet branches 226) can also be two, four, five or more oil outlet branches. For example, referring to FIG. 1C , the three oil outlet branches 225 of the oil outlet branch group are connected in a tree-like manner; but not limited to this, as long as it can satisfy the requirement of converting one oil path of the first oil outlet channel 221 and the second oil outlet channel 222 into multiple oil paths.

[0047] The structure and working principle of the stator core 2 according to the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0048] FIG. 3 An exploded schematic diagram of the first core portion, the second core portion, and the third core portion of the stator core of an embodiment of the present application is shown.

[0049] refer to FIG. 3 Combined with FIG. 1B and FIG. 2 , along the axial direction (such as FIG. 3(shown in the X direction), the first core portion 201, the second core portion 202, and the third core portion 203 are arranged alternately, with the first core portion 201 and the third core portion 203 respectively arranged on opposite sides of the second core portion 202. In the axial direction X, the second core portion 202 is arranged on opposite sides of the first core portion 201. The first core portion 201 includes a plurality of first oil outlet channels 221, which are spaced apart along the circumferential direction R within the first core portion 201 and extend along the axial direction X. The second core portion 202 includes a plurality of second oil outlet channels 222, which are spaced apart along the circumferential direction R within the second core portion 202 and are connected to the plurality of first oil outlet channels 221 in a one-to-one correspondence. In the axial direction X, the third core portion 203 is arranged on the side of the second core portion 202 away from the first core portion 201. The third core portion 203 includes a plurality of third oil outlet channels 223 and a plurality of oil outlet holes 224. Along the circumferential direction R, the plurality of third oil outlet channels 223 are spaced apart in the third core portion 203 and are correspondingly connected to the plurality of oil outlet holes 224. The plurality of third oil outlet channels 223 are correspondingly connected to the plurality of second oil outlet channels 222.

[0050] Continue to refer FIG. 3 , the multiple first oil outlet branches 225 of each first oil outlet channel 221 are correspondingly connected to the multiple second oil outlet branches 226 of each second oil outlet channel 222. Moreover, the multiple second oil outlet channels 222 are correspondingly connected to the multiple third oil outlet channels 223. For example, FIG. 3 As shown in FIG, the second core portion 202, located on the axial side X of the first core portion 201, has 16 second oil outlet channels 222 and 48 second oil outlet branches 226, while the third core portion 203 has 16 third oil outlet channels 223. The number of second oil outlet branches 226 is greater than the number of second oil outlet channels 222. Therefore, the 16 second oil outlet channels 222 are arranged in a one-to-one correspondence with the corresponding 16 third oil outlet channels 223. In other words, the 16 third oil outlet channels 223 are in one-to-one communication with the 16 radial branches 2251 of the 48 second oil outlet branches 226.

[0051] However, the embodiment of the present application does not impose a specific limit on the number of third oil outlet channels 223, as long as multiple third oil outlet channels 223 are correspondingly connected to multiple second oil outlet channels 222, so that cooling oil can flow from the second oil outlet channels 222 through the third oil outlet channels 223 and then be ejected from the oil outlet holes 224. For example, multiple third oil outlet channels 223 can be connected to multiple second oil outlet branches 225 of each second oil outlet channel 222 in a one-to-one correspondence, or multiple third oil outlet channels 223 can be connected to any one of the multiple second oil outlet branches 226 of each second oil outlet channel 222.

[0052] FIG. 4 A front view of a first core punching sheet according to an embodiment of the present application is shown.

[0053] refer to FIG. 4 Combined with FIG. 3 The first core portion 201 includes a plurality of first core punching sheets 2011 .

[0054] like FIG. 4 As shown in FIG, each first core punching sheet 2011 has a circumferential direction (such as FIG. 4 A plurality of first oil outlet holes 22101 are arranged at intervals (as shown in the R direction). Each first oil outlet hole 22101 includes an opening 2111 and a plurality of first oil outlet branch holes 2253. The opening 2111 is arranged at the circumferential edge of the first iron core punching sheet 2011. FIG. 4 (as shown in the Y direction), a plurality of first oil outlet branch through holes 2253 are provided on a side of the circumferential edge away from the opening 2111.

[0055] Specifically, continue to refer to FIG. 4 Combined with FIG. 3 The plurality of first core punchings 2011 are stacked along the axial direction X to form the first core portion 201, so that each first oil outlet hole 22101 of the plurality of first core punchings 2011 is correspondingly penetrated along the axial direction X to form each first oil outlet channel 221. Simultaneously, each opening 2111 of the plurality of first core punchings 2011 is correspondingly penetrated along the axial direction X to form each first oil inlet channel 211. The first oil inlet channel 211 connects the first oil outlet channel 221 with the outside, so that external cooling oil can enter the first oil outlet channel 221 through the first oil inlet channel 211. The plurality of first oil outlet branch holes 2253 of each first oil outlet hole 22101 of the plurality of first core punchings 2011 are correspondingly penetrated along the axial direction X to form each first oil outlet branch channel 225 of each first oil outlet channel 221.

[0056] For example, FIG. 4 As shown in FIG, one of the three first oil outlet branch holes 2253 of each first oil outlet through hole 22101 extends in the radial direction Y, and the other two first oil outlet branch holes 2253 are symmetrically arranged relative to the first oil outlet branch hole 2253 along the circumferential direction R. Therefore, when the plurality of first core punchings 2011 are stacked along the axial direction X, the three first oil outlet branch holes 2253 of each first oil outlet through hole 22101 can be connected to form a radial branch 2251 and two circumferential branches 2252 in each first oil outlet channel 221, so as to align with the plurality of teeth 22 of the stator core 2 (see FIG. FIG. 1C ) correspondingly, improving the overall cooling effect of the stator core 2.

[0057] It should be noted that the number of the first core punching sheets 2011 stacked in the first core portion 201 is not limited in the embodiments of the present application, and can be set according to actual conditions. For example, the number of the first core punching sheets 2011 can be 15, 20, 25 or more.

[0058] FIG. 5 A front view of a second core punching sheet of the embodiments of the present application is shown.

[0059] Reference FIG. 5 and in combination FIG. 3 Each second core portion 202 includes a plurality of second core punching sheets 2021.

[0060] As FIG. 5 shown in the drawings, each second core punching sheet 2021 includes a plurality of second oil outlet through holes 22201, and each second oil outlet through hole 22201 includes a plurality of second oil outlet branch through holes 2254.

[0061] Specifically, continuing to refer to FIG. 5 and in combination FIG. 3 , the plurality of second oil outlet through holes 22201 are arranged at intervals along the circumferential direction (as indicated by the R direction in FIG. 5 ) of the second core punching sheet 2021. The plurality of second core punching sheets 2021 are stacked along the axial direction (as indicated by the X direction in FIG. 3 ) to form the second core portion 202, so that each second oil outlet through hole 22201 of the plurality of second core punching sheets 2021 corresponds to pass through to form each second oil outlet passage 222 along the axial direction X, and the plurality of second oil outlet branch through holes 2254 of each second oil outlet through hole 22201 of the plurality of second core punching sheets 2021 correspond to pass through to form the plurality of second oil outlet branches 226 of each second oil outlet passage 222 along the axial direction X.

[0062] Exemplarily, referring to FIG. 5 and in combination FIG. 1B , FIG. 1C and FIG. 4 , one of the three second oil outlet branch through holes 2254 of each second oil outlet through hole 22201 extends along the radial direction Y, and the other two second oil outlet branch through holes 2254 are arranged symmetrically along the circumferential direction R with respect to the second oil outlet branch through hole 2254. Thus, when the plurality of second core punching sheets 2021 are stacked along the axial direction X, the three second oil outlet branch through holes 2254 of each second oil outlet branch through hole 2254 can correspond to pass through to form one radial branch 2251 and two circumferential branches 2252 (i.e. another part of the plurality of oil outlet branches located in the second core portion 202) in each second oil outlet passage 222 along the axial direction X, so as to correspond to the plurality of tooth portions 22 (see FIG. 1C ) of the stator core 2, thereby improving the overall cooling effect of the stator core.

[0063] FIG. 6A Fig. 3 shows a front view of a third core punching sheet according to an embodiment of the present application.

[0064] Referring to FIG. 6A and in conjunction with FIG. 3 , each third core portion 203 comprises a plurality of third core punching sheets 2031.

[0065] In particular, as FIG. 6A shown in the figures, each third core punching sheet 2031 comprises a plurality of third oil outlet through holes 2231, which are arranged along the circumferential direction (as shown by the R direction in the figures) of the third core punching sheet 2031. FIG. 6A

[0066] Continuing to refer to FIG. 6A and in conjunction with FIG. 3 , the plurality of third core punching sheets 2031 are stacked along the axial direction X to form the third core portion 203, so that each third oil outlet through hole 2231 of the plurality of third core punching sheets 2031 corresponds to form a third oil outlet passage 223 along the axial direction X.

[0067] As described above, referring to FIG. 3 , the plurality of third oil outlet passages 223 are arranged in one-to-one correspondence with the radial branch 2251 of the three second oil outlet branches 226 of each second oil outlet passage 222. However, it is not limited thereto, and the plurality of third oil outlet passages 223 can also be in one-to-one correspondence with the three second oil outlet branches 226 of each second oil outlet passage 222.

[0068] Referring to FIG. 6B and in conjunction with FIG. 3 and FIG. 1C , in some possible embodiments, each third core punching sheet 2031 comprises 48 third oil outlet through holes 2231, and when the plurality of third core punching sheets 2031 are stacked along the axial direction X to form the third core portion 203, the 48 third oil outlet through holes 2231 correspondingly form 48 third oil outlet passages 223 along the axial direction X, so that the 48 third oil outlet passages 223 are in one-to-one correspondence with the 48 second oil outlet branches 226 of the 16 second oil outlet passages 222, to further improve the overall cooling effect of the stator core 2 on the tooth portion 22 and the winding (not shown in the figures).

[0069] ​Although the utility model has been illustrated and described by referring to certain preferred embodiments of the utility model, it should be understood by those skilled in the art that the above content is the further detailed description of the utility model combined with the specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple inferences or replacements, without departing from the spirit and scope of the utility model.

Claims

1. A stator core characterized by, The application relates to a stator core of an electric motor, comprising: a first core part having a first oil inlet channel and a first oil outlet channel, the first oil inlet channel extending along a radial direction of the stator core and being communicated with the first oil outlet channel, the first oil outlet channel comprising a plurality of first oil outlet branches communicated with each other; a second core part arranged on opposite sides of the first core part along an axial direction of the stator core, the second core part having a second oil outlet channel communicated with the first oil outlet channel, the second oil outlet channel comprising a plurality of second oil outlet branches communicated with each other, and the plurality of first oil outlet branches being communicated with the plurality of second oil outlet branches correspondingly; a third core part arranged on opposite sides of the second core part along the axial direction, the third core part comprising a third oil outlet channel and an oil outlet hole; the third oil outlet channel being communicated with the second oil outlet channel at one end along the axial direction and communicated with the oil outlet hole at the other end.

2. The stator core according to claim 1, characterized by The plurality of first oil outlet branches and the plurality of second oil outlet branches have the same structure and each comprise a radial branch and a circumferential branch; the radial branch extending along the radial direction and the circumferential branch being arranged on opposite sides of the radial branch along a circumferential direction of the stator core.

3. The stator core of claim 2, characterized by The circumferential branch comprises a first extension section and a second extension section, the first extension section being arranged at an angle with the radial branch, the second extension section extending along the radial direction and the circumferential direction, and the second extension section being arranged at intervals with the radial branch.

4. The stator core according to any one of claims 1 to 3, characterized in that, The first oil inlet channel extends along the axial direction, and the second oil outlet channel extends along the axial direction; the first core part comprising a plurality of first oil inlet channels and a plurality of first oil outlet channels, the plurality of first oil outlet channels being arranged at intervals in the first core part along the circumferential direction of the stator core and communicated with the plurality of first oil inlet channels correspondingly; the second core part comprising a plurality of second oil outlet channels, the plurality of second oil outlet channels being arranged at intervals in the second core part along the circumferential direction and communicated with the plurality of first oil outlet channels correspondingly.

5. The stator core of claim 4, characterized by the third core part comprising a plurality of third oil outlet channels and a plurality of oil outlet holes, the plurality of third oil outlet channels being arranged at intervals in the third core part along the circumferential direction of the stator core and communicated with the plurality of oil outlet holes correspondingly, and the plurality of third oil outlet channels being communicated with the plurality of second oil outlet channels correspondingly.

6. The stator core of claim 5, characterized by The plurality of third oil outlet channels are communicated with any one of the plurality of second oil outlet branches of each second oil outlet channel one by one.

7. The stator core of claim 5, characterized by The plurality of third oil outlet channels are communicated with the plurality of second oil outlet branches of each second oil outlet channel one by one.

8. The stator core of claim 4, characterized by The first core part comprises a plurality of first core punching sheets arranged in stacks along the axial direction; the circumferential direction of each first core punching sheet is arranged at intervals with a plurality of first oil outlet through holes, each first oil outlet through hole comprising an opening arranged at a circumferential edge of the first core punching sheet along the radial direction and a plurality of first oil outlet branch through holes arranged at a side of the circumferential edge away from the opening. Each of the first oil outlet through holes of the first core punching sheet corresponds to form each of the first oil outlet channels along the axial direction, each of the openings of the first core punching sheet corresponds to form each of the first oil inlet channels along the axial direction, and the first oil outlet branch through holes of each of the first oil outlet through holes of the first core punching sheet correspond to form the first oil outlet branch of each of the first oil outlet channels along the axial direction.

9. The stator core of claim 8, characterized by Each of the second core portions comprises a plurality of second core punching sheets arranged in a stack along the axial direction; The circumferentially spaced second oil outlet through holes of each of the second core punching sheets each comprise a plurality of second oil outlet branch through holes; Each of the second oil outlet through holes of the second core punching sheets corresponds to form each of the second oil outlet channels along the axial direction, and the second oil outlet branch through holes of each of the second oil outlet through holes of the second core punching sheets correspond to form the second oil outlet branch of each of the second oil outlet channels along the axial direction.

10. The stator core of claim 5, characterized by Each of the third core portions comprises a plurality of third core punching sheets arranged in a stack along the axial direction; The circumferentially spaced third oil outlet through holes of each of the third core punching sheets each comprise a plurality of third oil outlet branch through holes; Each of the third oil outlet through holes of the third core punching sheets corresponds to form each of the third oil outlet channels along the axial direction.

11. An electric machine characterized by Comprise: A housing, the housing being provided with an oil inlet; The stator core of any one of claims 1 to 10 is arranged inside the housing, along the radial direction, the first core portion is arranged spaced apart from the housing, the second core portion and the third core portion are sealingly connected with the housing, and together with the housing define a second oil inlet channel, the second oil inlet channel is arranged around the stator core along the circumferential direction of the stator core; The oil inlet is in communication with the second oil inlet channel, and the second oil inlet channel is in communication with the first oil inlet channel.

Images