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 which are communicated with each other and comprises a plurality of oil outlet branches which are communicated with each other; the second iron core part is arranged on two opposite sides of the first iron core part and is provided with a plurality of second oil outlet channels, and the plurality of second oil outlet channels are correspondingly communicated with the plurality of oil outlet branches of the first oil outlet channel and are staggered in the axial direction; the third iron core part and the first iron core part are arranged on the two opposite sides of the second iron core part, the third iron core part is provided with a plurality of third oil outlet channels, each third oil outlet channel is provided with an oil outlet hole, one end of each third oil outlet channel is communicated with each second oil outlet channel in the axial direction, and each oil outlet hole is formed in the other end of each third oil outlet channel. The cooling efficiency and the cooling effect can be improved, and the design cost is reduced. 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 a kind of stator core and motor. BACKGROUND

[0002] The existing motor cooling design scheme is to cool the core and winding through the axial direct current of stator core. For example, Chinese patent CN202311273276.2 discloses a design scheme using intermediate oil inlet mode, cooling liquid flows to both ends through the surface groove of core, and then flows out from the oil outlet hole at both ends through the oil channel close to the tooth slot. U.S. patent US20210351641A1 discloses a design scheme using intermediate oil inlet of core, cooling liquid is introduced layer by layer from the middle to the inside, and the oil outlet hole is formed by using the lamination misalignment scheme at the oil outlet.

[0003] However, the existing motor cooling design scheme has complex and multiple types of stator core laminations, and large-area openings on the stator core laminations will have adverse effects on electromagnetism. The outer diameter of the stator core requires a large amount of material, resulting in high material costs, and the assembly process of the existing motor cooling design scheme is more complex and has high material costs. SUMMARY

[0004] The utility model aims to solve the problems of high cost and influence on electromagnetism of the existing motor cooling design scheme. The utility model provides a kind of stator core and motor, which can avoid large-area openings in punching, reduce the influence on electromagnetism, save materials and reduce production cost.

[0005] To solve the above technical problems, the embodiment of the utility model discloses a kind of stator core, comprising: first 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 oil outlet branches communicated with each other;Second core part, along the axial direction of the stator core, the second core part is located on the opposite sides of the first core part, the second core part has a plurality of second oil outlet channels, the plurality of second oil outlet channels are communicated with the plurality of oil outlet branches of the first oil outlet channel, and are misaligned in the axial direction;Third core part, along the axial direction, the third core part and the first core part are located on the opposite sides of the second core part, the third core part has a plurality of third oil outlet channels, and each third oil outlet channel has an oil outlet hole, along the axial direction, one end of each third oil outlet channel is communicated with each second oil outlet channel, and each oil outlet hole is located at the other end of the third oil outlet channel.

[0006] 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 that the stator core of the motor is cooled. Moreover, the first oil outlet channel is converted into multiple oil passages through the multiple oil outlet branches, so that the flow direction of the cooling oil is changed to slow down the flow speed of the cooling oil, and the cooling oil can continuously contact the stator core when flowing in the multiple oil outlet branches, thereby enhancing the heat conduction efficiency of the stator core.

[0007] In addition, the second oil outlet channel and the oil outlet branch are axially misaligned and communicated in the embodiment, compared with the straight and flush channel in the axial direction, the cooling path of the cooling oil flowing through the oil outlet branch and the second oil outlet channel is effectively increased, so that the heat exchange time of the cooling oil is increased, and the cooling effect is further improved. Moreover, the oil passage of the stator core in the embodiment is designed, so that the cooling oil in the oil passage (for example, the second oil outlet channel) is closer to the copper wire wound around the tooth part and arranged in the tooth slot, and the heat generated by the copper wire of the winding can be quickly taken away, and the temperature of the winding is reduced together with the cooling oil sprayed from the oil outlet hole.

[0008] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a kind of stator cores, and the multiple oil outlet branches of the first oil outlet channel include two oil outlet branches, and two described oil outlet branches are symmetrically arranged along the circumferential direction, and are communicated with the first oil inlet channel.

[0009] According to the technical scheme, the two oil outlet branches in the multiple 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 between the inside of the stator core and the cooling oil is enhanced.

[0010] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a kind of stator cores, and each described oil outlet branch includes first extension section and second extension section, and the first extension section and the second extension section are arranged at angle intersection, and the second extension section extends along the radial direction.

[0011] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a kind of stator cores, and the multiple oil outlet branches of the first oil outlet channel include three oil outlet branches, and three described oil outlet branches are spaced apart along the circumferential direction, and are communicated with the first oil inlet channel.

[0012] The three oil outlet branches can change the flow direction of the cooling oil, convert one oil path into multiple oil paths, and enable the cooling oil to continuously contact the middle part of the stator core, thereby enhancing the heat conduction efficiency between the inside of the stator core and the cooling oil.

[0013] According to another specific embodiment of the present application, the embodiment of the present application discloses a stator core, the first core part comprises a plurality of first oil inlet channels and a plurality of first oil outlet channels, and the plurality of first oil outlet channels are arranged at intervals in the first core part along the circumferential direction of the stator core and are in communication with the plurality of first oil inlet channels.

[0014] According to another specific embodiment of the present application, the embodiment of the present application discloses a stator core, the first core part comprises a plurality of first core punching sheets arranged in 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 comprises an opening and a plurality of oil outlet branch through holes, and the opening extends from the circumferential edge of the first core punching sheet to the inside; each first oil outlet through hole of the plurality of first core punching sheets is formed along the axial direction to correspond to each first oil outlet channel, each opening of the plurality of first core punching sheets is formed along the axial direction to correspond to each first oil inlet channel, and the plurality of oil outlet branch through holes of each first oil outlet through hole of the plurality of first core punching sheets are formed along the axial direction to correspond to the plurality of oil outlet branches of each first oil outlet channel.

[0015] According to another specific embodiment of the present application, the embodiment of the present application discloses a stator core, the first core part comprises a plurality of first core punching sheets arranged in 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 comprises an opening and a plurality of oil outlet branch through holes, and the opening extends from the circumferential edge of the first core punching sheet to the inside; each first oil outlet through hole of the plurality of first core punching sheets is formed along the axial direction to correspond to each first oil outlet channel, each opening of the plurality of first core punching sheets is formed along the axial direction to correspond to each first oil inlet channel, and the plurality of oil outlet branch through holes of each first oil outlet through hole of the plurality of first core punching sheets are formed along the axial direction to correspond to the plurality of oil outlet branches of each first oil outlet channel.

[0016] According to another specific embodiment of the present application, the embodiment of the present application discloses a stator core, each second core part comprises a plurality of second core punching sheets arranged in the axial direction; the circumferential direction of each second core punching sheet is arranged at intervals with a plurality of second oil outlet through holes, each second oil outlet through hole extends along the radial direction, and one end of each second oil outlet through hole extends to the tooth part of the second core punching sheet; each second oil outlet through hole of the plurality of second core punching sheets is formed along the axial direction to correspond to each second oil outlet channel.

[0017] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a stator core, wherein the second oil outlet hole is an oblong hole.

[0018] 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.

[0019] 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.

[0020] 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

[0021] FIG. 1A A cross-sectional view of the motor in the first embodiment of the present invention is shown;

[0022] FIG. 1B Show FIG. 1A A partial enlarged view of area A in the middle;

[0023] FIG. 1C A partial cross-sectional view of the stator core in the first embodiment of the present invention is shown;

[0024] FIG. 1D Show FIG. 1C A partial enlarged view of the middle B area;

[0025] FIG. 2 A three-dimensional diagram of the stator core in the first embodiment of the present invention is shown;

[0026] FIG. 3The exploded schematic view of the first core part, the second core part and the third core part of the stator core in the embodiment one of the utility model is shown.

[0027] FIG. 4 The front view of the first core punching sheet in the embodiment one of the utility model is shown.

[0028] FIG. 5 The front view of the second core punching sheet in the embodiment one of the utility model is shown.

[0029] FIG. 6 The front view of the third core punching sheet in the embodiment one of the utility model is shown.

[0030] FIG. 7 The exploded schematic view of the first core part, the second core part and the third core part of the stator core in the embodiment two of the utility model is shown.

[0031] FIG. 8 The front view of the third core punching sheet in the embodiment two of the utility model is shown. DETAILED DESCRIPTION

[0032] The other advantages and effects of the utility model can be easily understood by the person skilled in the art from the content disclosed in the description. 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 choices or modifications which 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 contained 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.

[0033] It should be noted that in the description, 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.

[0034] 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, therefore it cannot be understood as a limitation on the utility model.

[0035] The terms "first", "second", etc. are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0036] 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.

[0037] In order to make the purpose, technical scheme and advantages of the utility model clearer, the embodiments of the utility model will be further described in detail below with reference to the drawings.

[0038] Reference FIGS. 1A-3 The application provides an electric machine 1, comprising: a shell 11 and a stator core 2. Wherein, the stator core 2 is arranged in the inside of the shell 11.

[0039] 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 the Y direction of FIG. 1A As shown in FIG. 1A The shell 11 also includes an oil outlet 112 along the radial direction Y, and the oil inlet 111 and the oil outlet 112 are arranged on the upper and lower sides of the stator core 2 respectively. Wherein, the number of oil outlets 112 includes two, and the two oil outlets 112 are arranged at intervals along the axial direction (as shown in the X direction of FIG. 1A The application embodiments do not make specific limitations on 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 oil inlets 111 can also be two, three, four or more, and the number of oil outlets 112 can also be one, three, four or more. Exemplarily, the shell 11 of the application embodiments also includes a shaft hole 13 arranged on the axial X side of the shell 11, so that the rotor (not shown in the figure) passes through.

[0040] Continue to refer to FIG. 1A And combine FIG. 3 The above-mentioned stator core 2 includes an intermediate part 20 and an end part 21. Wherein, the intermediate part 20 includes a first core part 201 and a second core part 202, and the end part 21 includes a third core part 203.

[0041] Specifically, 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.

[0042] 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, which has 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 provided with the oil outlet hole 224.

[0043] FIG. 1C A partial cross-sectional view of the stator core 2 according to an embodiment of the present application is shown.

[0044] refer to FIG. 1C and FIG. 1D and combined FIG. 1A 、 FIG. 1B and FIG. 3 , the multiple second oil outlet channels 222 of the stator core 2 of the embodiment of the present application are connected to the multiple oil outlet branches 225 in a one-to-one correspondence, and in the axial direction (such as FIG. 1B Each second oil outlet channel 222 extends along the radial direction Y to the tooth portion 22 of the second core portion 202.

[0045] Exemplarily, as shown in FIG. 1B and FIG. 1D , along the radial direction Y (as indicated by the Y direction in FIG. 1B ), the radial Y side of each oil outlet branch 225 (i.e. the bottom wall 22501 of the oil outlet branch 225) is located above the radial Y side of each second oil outlet channel 222 (i.e. the bottom wall 2221 of the second oil outlet channel 222). Thus, in the oil circuit of the stator core 2 of the embodiment, the cooling oil enters the first oil outlet channel 221, then enters the plurality of oil outlet branches 225 and flows to the corresponding second oil outlet channel 222, so as to flow in the interior of the stator core 2 (for example, the interior of the first core portion 201 and the second core portion 202), slow down the flow rate of the cooling oil, and make the cooling oil continuously contact the inner wall of the oil outlet branch 225 and the second oil outlet channel 222, so as to form a continuous cooling effect. In addition, the second oil outlet channel 222 and the oil outlet branch 225 are axially X staggered, compared with the straight and flush channel along the axial X direction, the cooling path of the cooling oil flowing through the oil outlet branch 225 and the second oil outlet channel 222 is effectively increased, so as to increase the heat exchange time of the cooling oil, and further improve the cooling effect.

[0046] Then, the cooling oil flows from the second oil outlet channel 222 to the third oil outlet channel 223, and after passing through the third oil outlet channel 223, the cooling oil is sprayed out from the oil outlet hole 224 (i.e. the flow direction of the cooling oil is: a→b→c→d→e, as indicated by the dashed line with arrows in FIG. 1B ), so as to cool other components (for example, the winding) of the stator core 2, reduce the temperature of the winding (not shown in the figure), and slow down the temperature rise of the winding.

[0047] In addition, as shown in FIG. 1D , the radial Y side of each second oil outlet channel 222 (i.e. the bottom wall 2221 of the second oil outlet channel 222) extends to the tooth portion 22 of the second core portion 202. Thus, the oil circuit design of the stator core 2 of the embodiment makes the cooling oil in the oil circuit (for example, the second oil outlet channel 222) closer to the copper wire wound on the tooth portion 22 and arranged in the tooth slot 23, so as to quickly take away the heat generated by the copper wire of the winding, and together with the cooling oil sprayed from the oil outlet hole 224 to reduce the temperature of the winding (not shown in the figure).

[0048] In the embodiment of the stator core 2, there are two structures of the first core portion 201, wherein the first core portion 201 including two oil outlet branches 225 as embodiment one, specifically, the two oil outlet branches 225 of the embodiment one are in Y-shaped distribution. The first core portion 201 including three oil outlet branches 225 as embodiment two, specifically, the three oil outlet branches 225 of the embodiment two are in tree-shaped distribution.

[0049] Next, the stator core 2 is described with respect to Embodiment One and Embodiment Two, respectively.

[0050] Embodiment One

[0051] Reference FIG. 1C and FIG. 1D in combination FIG. 1A and FIG. 1B Each of the first oil outlet channels 221 of the first core portion 201 of the intermediate portion 20 includes two oil outlet branches 225, and the second oil outlet channel 222 and the oil outlet branch 225 each extend along the axial direction X. Moreover, the two oil outlet branches 225 of each of the first oil outlet channels 221 correspond to the plurality of second oil outlet channels 222 of the second core portion 202 in one-to-one correspondence.

[0052] Specifically, as shown in FIG. 1C , the two oil outlet branches 225 are arranged in a cross manner, and one end of each of the oil outlet branches 225 meets at the first oil outlet channel 221, so that the two oil outlet branches 225 are connected to each other through the first oil outlet channel 221.

[0053] Exemplarily, as shown in FIG. 1D , the two oil outlet branches 225 of the embodiment of the application are both first oil outlet branches 2251.

[0054] For the convenience of description, the two oil outlet branches 225 are referred to as two first oil outlet branches 2251 in the following description.

[0055] The two first oil outlet branches 2251 are arranged symmetrically along the circumferential direction (as shown by the direction R in FIG. 1D ) of the stator core 2. However, the distribution position of the two first oil outlet branches 2251 is not limited in the embodiment of the application, FIG. 1C and FIG. 1D The two first oil outlet branches 2251 of the first oil outlet channel 221 are arranged in a Y-shaped manner and meet at the first oil outlet channel 221; however, the application is not limited thereto, and as long as the two first oil outlet branches 2251 can be connected to each other, the first oil outlet channel 221 can be converted into a plurality of oil channels. For example, the two first oil outlet branches 2251 of the first oil outlet channel 221 can also be arranged in a N-shaped manner, that is, one first oil outlet branch 2251 is connected to the first oil outlet channel 221, and the other first oil outlet branch 2251 is connected to the first oil outlet branch 2251.

[0056] Continuing to refer to FIG. 1D , the first oil outlet branch 2251 described above includes a first extension segment 22511 and a second extension segment 22512. Exemplarily, the first extension segment 22511 and the second extension segment 22512 are arranged at an acute angle (as shown by the direction A in FIG. 1CThe two first oil outlet branches 2251 are arranged in cross. In addition, the second extension sections 22512 of the two first oil outlet branches 2251 each extend along the radial direction Y and are parallel to each other.

[0057] As shown in the figure, FIG. 1D In the radial direction Y, each second oil outlet channel 222 partially overlaps with the second extension section 22512 of each first oil outlet branch 2251, so that each second oil outlet channel 222 and the corresponding oil outlet branch 225 are staggered in communication in the axial direction X. However, the present application is not limited to the overlapping range of each second oil outlet channel 222 and the second extension section 22512 of each first oil outlet branch 2251, for example, each second oil outlet channel 222 and the second extension section 22512 of each first oil outlet branch 2251 can also be fully overlapped in the radial direction Y.

[0058] Therefore, the present application designs the oil channel to cool the stator core 2 by allowing the cooling oil to enter the stator core 2 from the middle part 20 through the first oil inlet channel 211 and the second oil inlet channel 212, and then allowing the cooling oil to enter the stator core 2 to be discharged from the oil outlet hole 224 through the first oil outlet channel 221, the second oil outlet channel 222 and the third oil outlet channel 223 extending in the axial direction X, so as to cool the stator core 2 of the motor 1.

[0059] In addition, by converting one oil channel into multiple oil channels through the two first oil outlet branches 2251 of each first oil outlet channel 221, the flow direction of the cooling oil is changed to slow down the flow rate of the cooling oil, so that the cooling oil can continuously contact the stator core 2 when flowing in the multiple first oil outlet branches 2251, thereby enhancing the heat conduction efficiency of the stator core 2.

[0060] In addition, the stator core 2 cooling design scheme of the present application can reduce the oil channel design on the outer side of the stator core 2 in the circumferential direction of the stator assembly cooling level, compared with the existing oil ring and other parts design. By converting one oil channel into multiple oil channels through the two first oil outlet branches 2251 of each first oil outlet channel 221 of the first core part 201, the present application saves material cost, simplifies production process, and effectively improves the cooling effect of the stator core 2.

[0061] The structure and working principle of the stator core 2 of the present application will be described in detail below with reference to the accompanying drawings.

[0062] FIG. 3 The exploded view of the first core part, the second core part and the third core part of the stator core of the first embodiment of the present application is shown.

[0063] Referring to FIG. 3 and in combination with FIG. 1B and FIG. 2 , in the axial direction (as shown in the figure FIG. 3The first core portion 201, the second core portion 202 and the third core portion 203 are staggered, and the first core portion 201 and the third core portion 203 are respectively arranged on the opposite sides of the second core portion 202.

[0064] Specifically, the first core portion 201 includes a plurality of first oil outlet channels 221, which are arranged in the interior of the first core portion 201 along the circumferential direction R (as shown in FIG. 2B) and extend along the axial direction X. FIG. 3 The plurality of first oil outlet channels 221 are arranged in the interior of the first core portion 201 along the circumferential direction R, and extend along the axial direction X. The second core portion 202 includes a plurality of second oil outlet channels 222, which are arranged in the interior of the second core portion 202 along the circumferential direction R, and the plurality of second oil outlet channels 222 are in one-to-one correspondence with the plurality of oil outlet branches 225 of each first oil outlet channel 221. The third core portion 203 is arranged on the side of the second core portion 202 away from the first core portion 201 along the axial direction X. The third core portion 203 includes a plurality of third oil outlet channels 223, which are arranged in the third core portion 203 along the circumferential direction R, and the plurality of third oil outlet channels 223 are in one-to-one correspondence with the plurality of second oil outlet channels 222, and each third oil outlet channel 223 is provided with an oil outlet hole 224 at the other end 22302.

[0065] Continuing to refer to FIG. 3 and in combination with FIG. 1B , the two first oil outlet branches 2251 of each first oil outlet channel 221 are in correspondence with the two second oil outlet channels 222. In addition, each second oil outlet channel 222 is in correspondence with a third oil outlet channel 223. For example, as shown in FIG. 3 , the second core portion 202 on the side of the axial direction X of the first core portion 201 has 48 second oil outlet channels 222, and the third core portion 203 has 48 third oil outlet channels 223 in one-to-one correspondence with the 48 second oil outlet channels 222.

[0066] FIG. 4 A front view of the first core punching sheet of the embodiment of the present application is shown.

[0067] Referring to FIG. 4 and in combination with FIG. 3 , the first core portion 201 includes a plurality of first core punching sheets 2011.

[0068] As shown in FIG. 4 , the circumferential direction (as shown in FIG. 2A) of each first core punching sheet 2011 is in correspondence with the circumferential direction R of the first core portion 201. FIG. 4The first oil outlet through holes 22101 are arranged in the first iron core punching sheets 2011 in the axial direction X. Each of the first oil outlet through holes 22101 includes an opening 2111 extending from the circumferential edge of the corresponding first iron core punching sheet 2011 to the inside of the first iron core punching sheet 2011 in the radial direction (as indicated by the arrow R) and two oil outlet branch through holes 2253 arranged on the side away from the opening 2111 in the circumferential direction (as indicated by the arrow Y). FIG. 4

[0069] Specifically, with reference to FIG. 4 and in combination with FIG. 3 , the plurality of first iron core punching sheets 2011 are stacked in the axial direction X to form the first iron core portion 201, so that each of the first oil outlet through holes 22101 of the plurality of first iron core punching sheets 2011 correspondingly penetrates to form each of the first oil outlet passages 221 in the axial direction X. Meanwhile, each of the openings 2111 of the plurality of first iron core punching sheets 2011 correspondingly penetrates to form each of the first oil inlet passages 211 in the axial direction X, and the first oil inlet passages 211 are connected to the outside and the first oil outlet passages 221, so that the cooling oil in the outside can enter the first oil outlet passages 221 through the first oil inlet passages 211. The two oil outlet branch through holes 2253 of each of the first oil outlet through holes 22101 of the plurality of first iron core punching sheets 2011 correspondingly penetrates to form two oil outlet branches 225 (for example, two first oil outlet branches 2251) of each of the first oil outlet passages 221 in the axial direction X. For example, as indicated in FIG. 4 , the two oil outlet branch through holes 2253 of each of the first oil outlet through holes 22101 are symmetrically arranged in the circumferential direction R. Thus, when the plurality of first iron core punching sheets 2011 are stacked in the axial direction X, the two oil outlet branch through holes 2253 of each of the first oil outlet through holes 22101 can correspondingly penetrate to form the two first oil outlet branches 2251 in each of the first oil outlet passages 221, so as to correspond to the plurality of tooth portions 22 of the stator core 2, thereby improving the overall cooling effect of the stator core 2.

[0070] It should be noted that the number of the first iron core punching sheets 2011 stacked in the first iron core portion 201 is not limited in the embodiments of the present application, and can be specifically set according to actual conditions. For example, it can be 15, 20, 25 or more.

[0071] FIG. 5 A front view of the second iron core punching sheet of the first embodiment of the present application is shown.

[0072] With reference to FIG. 5 and in combination with FIG. 3 , each of the second iron core portions 202 includes a plurality of second iron core punching sheets 2021.

[0073] For example, as indicated in FIG. 5 ​As shown in , each second core punching sheet 2021 includes a plurality of second oil outlet holes 22201 .

[0074] Specifically, continue to refer to FIG. 5 and combined FIG. 3 , multiple second oil outlet holes 22201 are arranged along the circumference of the second core punching sheet 2021 (such as FIG. 5 The plurality of second core punching sheets 2021 are arranged at intervals along the axial direction (as shown in the R direction). FIG. 3 The second core portion 202 is stacked (as shown in the X direction) 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 is correspondingly penetrated along the axial direction X to form each second oil outlet channel 222. Exemplarily, the second oil outlet through hole 22201 is an oblong hole, but the embodiment of the present application does not limit the specific shape of the second oil outlet through hole 22201. For example, the second oil outlet through hole 22201 in the embodiment of the present application can also be a square hole, a rectangular hole, or other shapes.

[0075] For example, FIG. 4 and FIG. 5 As shown, the plurality of second oil outlet holes 22201 correspond to the plurality of teeth 22 of the second core punching sheet 2021. FIG. 5 One end 22202 of each second oil outlet through hole 22201 (shown in the Y direction) extends to the tooth portion 22 of the second core punching 2021, and one end 22531 of the oil outlet branch through hole 2253 extends above the tooth portion 22 of the first core punching 2011. Thus, when multiple second core punchings 2021 are stacked along the axial direction X, each second oil outlet through hole 22201 can be correspondingly penetrated to form each second oil outlet channel 222, and each second oil outlet channel 222 is axially offset from the corresponding oil outlet branch 225 (for example, the first oil outlet branch 2251), closer to the tooth portion 22, and can quickly remove the heat generated by the copper wire of the winding, while also increasing the heat exchange time of the cooling oil, further improving the cooling effect.

[0076] refer to FIG. 4 and FIG. 5 and combined FIG. 3 For example, the outer diameter of the first core punching sheet 2011 is smaller than the outer diameter of the second core punching sheet 2021, so that when multiple first core punching sheets 2011 are stacked along the axial direction X to form the first core part 201, and multiple second core punching sheets 2021 are stacked along the axial direction X to form the second core part 202, the outer diameter of the second core part 202 is larger than the outer diameter of the first core part 201, that is, the first core part 201 is spaced apart from the inner wall of the shell 11, so that the outer peripheral surface of the second core part 202 and the inner wall of the shell 11, as well as the outer peripheral surface of the first core part 201, jointly define the second oil inlet channel 212.

[0077] FIG. 6 Fig. 4 shows a front view of a third core punching sheet according to an embodiment of the present application.

[0078] Referring to FIG. 6 and in conjunction with FIG. 3 , each third core portion 203 comprises a plurality of third core punching sheets 2031.

[0079] In particular, as FIG. 6 shown in Fig. 5, 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 Fig. 5) of the third core punching sheet 2031. FIG. 6

[0080] Continuing to refer to FIG. 6 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 each third oil outlet passage 223 along the axial direction X. As described above, referring to FIG. 3 , the plurality of third oil outlet passages 223 are arranged in one-to-one correspondence with the plurality of second oil outlet passages 222, so as to further improve the overall cooling effect of the stator core 2 on the tooth portions 22 and the windings (not shown in the figure).

[0081] Embodiment Two

[0082] In the embodiment of the present application, the difference from the first embodiment is that each first oil outlet passage 221 of the first core portion 201 of the embodiment of the present application comprises three oil outlet branches 225 arranged in a tree type. In addition, the remaining structures of the stator core 2 of the embodiment of the present application are the same as those of the first embodiment, such as the second oil outlet passages 222 of the second core portion 202 of the stator core 2 and the third oil outlet passages 223 of the third core portion 203, and the like, which will not be described here again.

[0083] FIG. 7 Fig. 6 shows an exploded schematic view of the first core portion, the second core portion and the third core portion of the stator core according to the second embodiment of the present application. FIG. 8 Fig. 7 shows a front view of a first core punching sheet according to the second embodiment of the present application.

[0084] Referring to FIG. 7 and FIG. 8 , each first oil outlet passage 221 of the first core portion 201 comprises three oil outlet branches 225, and the three oil outlet branches 225 of each first oil outlet passage 221 communicate in one-to-one correspondence with the plurality of second oil outlet passages 222 of the second core portion 202.

[0085] In particular, as FIG. 8 ​As shown, the three oil outlet branches 225 are arranged in cross, and one end of each oil outlet branch 225 converges at the first oil outlet channel 221, so that the three oil outlet branches 225 are connected to each other through the first oil outlet channel 221. For example, as shown in FIG. 7 As shown, the three oil outlet branches 225 of the embodiment of the present application include two first oil outlet branches 2251 and one second oil outlet branch 2252.

[0086] For the convenience of description, the following description is taken as an example of the three oil outlet branches 225 being two first oil outlet branches 2251 and one second oil outlet branch 2252.

[0087] As shown in FIG. 8 and FIG. 7 and in combination with FIG. 1D , the second oil outlet branch 2252 extends along the radial direction (as shown in the Y direction in FIG. 8 ), and along the circumferential direction (as shown in the R direction in FIG. 8 ), the two first oil outlet branches 2251 are arranged on the opposite sides of the second oil outlet branch 2252, and the second extension section 22512 of the first oil outlet branch 2251 is arranged between the second oil outlet branch 2252. However, the number and structure of the plurality of oil outlet branches 225 of the embodiment of the present application are not limited, and can be specifically arranged according to the actual situation. For example, the number of the plurality of oil outlet branches 225 (for example, the first oil outlet branch 2251 and the second oil outlet branch 2252) can also be two, four, five oil outlet branches or more. For example, as shown in FIG. 7 and FIG. 8 , the two first oil outlet branches 2251 and the second oil outlet branch 2252 of the three oil outlet branches 225 are respectively connected in a tree branch shape; but not limited thereto, as long as the first oil outlet channel 221 can be converted into multiple oil paths.

[0088] Continuing to refer to FIG. 8 and in combination with FIG. 7 , the same as the first core punching sheet 2011 of the first embodiment, the first core punching sheet 2011 of the embodiment of the present application also has a plurality of first oil outlet through holes 22101 arranged at intervals along the circumferential direction (as shown in the R direction in FIG. 4 ). And each first oil outlet through hole 22101 includes an opening 2111 arranged at the circumferential edge of the first core punching sheet 2011 along the radial direction (as shown in the Y direction in FIG. 4 ), and three oil outlet branch through holes 2253 arranged on the side of the circumferential edge away from the opening 2111.

[0089] Specifically, as shown in FIG. 7 and FIG. 8As shown, the plurality of first core punching sheets 2011 are stacked along the axial direction X to form the first core portion 201, so that each first oil outlet through hole 22101 of the plurality of first core punching sheets 2011 corresponds to form each first oil outlet passage 221 along the axial direction X. Meanwhile, each opening 2111 of the plurality of first core punching sheets 2011 corresponds to form each first oil inlet passage 211 along the axial direction X, and the first oil inlet passage 211 is connected to the first oil outlet passage 221 and the outside, so that the cooling oil outside can enter the first oil outlet passage 221 through the first oil inlet passage 211. The three oil outlet branch through holes 2253 of each first oil outlet through hole 22101 of the plurality of first core punching sheets 2011 correspond to form the three oil outlet branches 225 (for example, two first oil outlet branches 2251 and one second oil outlet branch 2252) of each first oil outlet passage 221 along the axial direction X.

[0090] For example, one of the three oil outlet branch through holes 2253 of each first oil outlet through hole 22101 extends along the radial direction Y, and the other two oil outlet branch through holes 2253 are symmetrically arranged along the circumferential direction R with respect to the oil outlet branch through hole 2253. Thus, when the plurality of first core punching sheets 2011 are stacked along the axial direction X, the three oil outlet branch through holes 2253 of each first oil outlet through hole 22101 correspond to form two first oil outlet branches 2251 and one second oil outlet branch 2252 in each first oil outlet passage 221, so as to correspond to the plurality of tooth portions 22 of the stator core 2, thereby improving the overall cooling effect of the stator core 2.

[0091] In addition, as shown in FIG. 5 and FIG. 8 As described in Embodiment One, one end 22202 of each second oil outlet through hole 22201 of the second core punching sheet 2021 extends to the tooth portion 22 along the radial direction (as shown in the Y direction of FIG. 5 , and one end 22531 of the oil outlet branch through hole 2253 extends above the tooth portion 22 of the first core punching sheet 2011. It can be understood that when the plurality of second core punching sheets 2021 are stacked along the axial direction X, each second oil outlet through hole 22201 corresponds to form each second oil outlet passage 222, and each second oil outlet passage 222 is axially offset from the corresponding oil outlet branch 225 (for example, the first oil outlet branch 2251 and the second oil outlet branch 2252), which is closer to the tooth portion 22, can quickly remove the heat generated by the copper wire of the winding, and at the same time can increase the heat exchange time of the cooling oil, thereby further improving the cooling effect.

[0092] It should be noted that the number of 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 specifically set according to actual conditions. For example, it can be 15, 20, 25 or more.

[0093] In summary, the embodiment of the application provides a stator core 2 and a motor 1, first and second oil outlet channels 221 and 222 are arranged, a plurality of oil outlet branches 225 of the first oil outlet channel 221 are used to convert one oil path into a plurality of oil paths, the large-area punching of the punching piece can be avoided, the influence on the electromagnet is reduced, the material is saved, the production cost is reduced, and the oil path design of the stator core 2 is closer to the copper wire in the tooth slot through the axial dislocation communication of the second oil outlet channel 222 and the corresponding oil outlet branch 225, so that the near-slot oil cooling cooling effect is better.

[0094] 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 in combination with 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 a number of simple deductions 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 in communication with the first oil outlet channel, and the first oil outlet channel comprising a plurality of oil outlet branches in communication 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 plurality of second oil outlet channels corresponding to the plurality of oil outlet branches of the first oil outlet channel and being staggered along the axial direction; a third core part arranged on opposite sides of the second core part along the axial direction, the third core part having a plurality of third oil outlet channels, and each of the third oil outlet channels having an oil outlet hole, one end of each of the third oil outlet channels being in communication with each of the second oil outlet channels along the axial direction, and each of the oil outlet holes being arranged at the other end of the third oil outlet channel.

2. The stator core according to claim 1, characterized by The plurality of oil outlet branches of the first oil outlet channel comprises two oil outlet branches arranged symmetrically along a circumferential direction and in communication with the first oil inlet channel.

3. The stator core of claim 2, characterized by Each of the oil outlet branches comprises a first extension section and a second extension section arranged at an angle, and the second extension section extends along the radial direction.

4. The stator core of claim 1, characterized by The plurality of oil outlet branches of the first oil outlet channel comprises three oil outlet branches arranged at intervals along the circumferential direction and in communication with the first oil inlet channel.

5. The stator core according to any one of claims 1 to 4, characterized in that, The first core part comprises a plurality of the first oil inlet channels and a plurality of the first oil outlet channels, and the plurality of the first oil outlet channels are arranged at intervals along a circumferential direction of the stator core and in communication with the plurality of the first oil inlet channels.

6. The stator core of claim 5, characterized by The first core part comprises a plurality of first core laminations arranged at intervals along the axial direction. Each of the first core laminations is provided with a plurality of first oil outlet holes arranged at intervals along the circumferential direction, and each of the first oil outlet holes comprises an opening extending from a circumferential edge of the first core lamination to an inner portion and a plurality of oil outlet branch through holes. Each of the first oil outlet holes of the plurality of the first core laminations forms each of the first oil outlet channels along the axial direction, each of the openings of the plurality of the first core laminations forms each of the first oil inlet channels along the axial direction, and the plurality of the oil outlet branch through holes of each of the first oil outlet holes of the plurality of the first core laminations forms the plurality of the oil outlet branches of each of the first oil outlet channels along the axial direction.

7. The stator core of claim 5, characterized by Each of the second core parts comprises a plurality of second core laminations arranged at intervals along the axial direction. Each of the second core laminations is provided with a plurality of second oil outlet holes arranged at intervals along the circumferential direction, and each of the second oil outlet holes extends along the radial direction and has one end extending to a tooth portion of the second core lamination. Each of the second oil outlet holes of the plurality of the second core laminations forms each of the second oil outlet channels along the axial direction.

8. The stator core of claim 7, characterized by The second oil outlet hole is an oblong hole.

9. The stator core of claim 5, characterized by Each of the third core portions comprises a plurality of third core sheets stacked along the axial direction; The third oil outlet through holes are arranged in the circumferential direction of each of the third core sheets; Each of the third oil outlet through holes of the plurality of third core sheets correspondingly forms a third oil outlet channel along the axial direction.

10. An electric machine characterized by Comprising: A housing, the housing being provided with an oil inlet; The stator core according to any one of claims 1 to 9 is arranged in the interior of the housing, along the radial direction, the first core portion is arranged in the spaced manner with the housing, the second core portion and the third core portion are sealingly connected with the housing, and the second core portion and the third core portion 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.

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