Motor and stator core

Abstract

The utility model discloses a motor and a stator core, and the motor comprises a housing which is provided with an oil inlet; the stator core is arranged in the shell; the winding is arranged on the stator core; in the radial direction, the middle part of the stator core and the shell jointly define a first oil inlet channel, the first oil inlet channel surrounds the middle part in the circumferential direction and communicates with an oil inlet of the shell, the middle part comprises a turbulent flow part, and the turbulent flow part defines a plurality of oil inlet branches communicating with one another in the first oil inlet channel; in the axial direction, the end parts of the stator iron core are arranged on the two opposite sides of the middle part, part of the end parts are in sealed connection with the shell, and each end part comprises a second oil inlet channel and an oil spraying hole; in the axial direction, one end of the second oil inlet channel communicates with the oil inlet branch, and the other end of the second oil inlet channel communicates with the oil spraying hole. The cooling device can improve the cooling effect and reduce the production cost.

Description

Technical Field

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

[0002] Existing motor cooling designs use oil spray pipes to spray the windings (Scheme 1). However, the bulk of the oil spray pipes occupies a large space in the cooling structure and results in uneven cooling. Alternatively, existing motor cooling solutions incorporate oil grooves axially along the core yoke and perforated oil rings at the core ends to cool the windings (Scheme 2). However, the oil guide ring design requires an additional oil ring, complicating the assembly process and increasing material costs. Utility Model Content

[0003] The purpose of the present invention is to solve the problems of poor cooling effect and high cost of existing motor cooling design solutions. The present invention provides a motor and a stator core, which can effectively improve the cooling effect of the stator core and windings and reduce production costs.

[0004] In order to solve the above technical problems, an embodiment of the present utility model discloses an electric motor, comprising: a shell, wherein the shell is provided with an oil inlet; a stator core, wherein the stator core is arranged inside the shell; a winding, wherein the winding is arranged on the stator core; in the radial direction, the middle part of the stator core and the shell jointly define a first oil inlet channel, the first oil inlet channel circumferentially surrounds the middle part and is connected to the oil inlet of the shell, the middle part includes a spoiler, and the spoiler defines a plurality of mutually connected oil inlet branches in the first oil inlet channel; in the axial direction, end parts of the stator core are arranged on opposite sides of the middle part, part of the end parts are sealed and connected to the shell, and the end parts include a second oil inlet channel and an oil injection hole; in the axial direction, one end of the second oil inlet channel is connected to the oil inlet branch, and the other end of the second oil inlet channel is connected to the oil injection hole.

[0005] With the above technical solution, cooling oil first enters the first oil inlet channel from the oil inlet. This application divides the first oil inlet channel into multiple oil inlet branches using a flow spoiler. This allows the cooling oil to continuously contact the middle portion of the stator core, enhancing heat conduction efficiency and providing a continuous cooling effect on the outer surface of the middle portion. Finally, after passing through the multiple oil inlet branches, the cooling oil enters the second oil inlet channel and is sprayed onto the windings through the oil spray holes, thereby reducing the temperature of the stator core ends and slowing the temperature rise of the windings.

[0006] Furthermore, compared with the existing oil injection pipe solution and oil guide ring solution, the embodiment of the present application achieves cooling of the stator core and windings at the same time with a smaller flow rate through the series structure of the first oil inlet channel, the spoiler, the second oil inlet channel and the oil injection hole, thereby reducing costs and effectively improving the cooling effect of the stator core and windings.

[0007] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, wherein along the axial direction, a portion of the second oil inlet channel close to the oil injection hole is configured to be arranged toward the winding along a first direction, and the first direction intersects with the axial direction.

[0008] With the above technical solution, the portion of the second oil inlet channel close to the oil spray hole is configured to be arranged along the first direction toward the winding, so that the cooling oil can be sprayed onto the winding through the oil spray hole to cool the winding.

[0009] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, wherein along the axial direction, the portion of the end portion close to the middle portion is sealedly connected to the housing, and the portion of the end portion away from the middle portion is spaced apart from the housing.

[0010] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a motor, wherein the middle portion also includes a first iron core portion, and the spoiler portion is protruded from the outer surface of the first iron core portion; wherein the spoiler portion includes a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the circumferential direction, and adjacent protrusions define the oil inlet branch, and the oil inlet branch extends along the axial direction.

[0011] By adopting the above technical solution, the multiple protrusions of the spoiler can change the flow direction of the cooling oil (for example, from axial flow to circumferential flow), so that the cooling oil can continuously contact the middle part, thereby enhancing the efficiency of heat conduction between the middle part and the cooling oil.

[0012] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, wherein the end portion further includes a second core portion and a third core portion, and the second oil inlet channel includes a first part and a second part; along the axial direction, the middle portion and the third core portion are respectively arranged on opposite sides of the second core portion, the second core portion is sealed and connected to the housing, the oil inlet branch is connected to the first part, and the oil injection hole is connected to the second part; wherein, the second core portion includes a plurality of the first parts, and along the circumferential direction, the plurality of the first parts are spaced apart in the second core portion, and the first part extends along the axial direction; the third core portion includes a plurality of the second parts, and along the circumferential direction, the plurality of the second parts are spaced apart in the third core portion, and at least part of the plurality of the second parts is correspondingly connected to the plurality of the first parts, and the second part extends along the first direction.

[0013] With the above technical solution, the second portion of the second oil inlet channel is configured to be arranged along the first direction toward the winding, so that the cooling oil can be sprayed onto the winding through the oil spray hole to cool the winding.

[0014] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a motor, wherein the first core part includes a plurality of first core punching sheets, and each of the first core punching sheets is provided with a plurality of protrusions at circumferential intervals; the plurality of first core punching sheets are stacked along the axial direction to form the first core part, so that the plurality of protrusions are stacked accordingly along the axial direction to form the plurality of protrusions.

[0015] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, wherein the number of the first core parts includes multiple, and the multiple first core parts are arranged along the axial direction; wherein, along the axial direction, the projections of the convex parts of at least two of the multiple first core parts do not overlap.

[0016] By adopting the above technical solution, the oil inlet branches of adjacent first core parts can be staggered in the axial direction and connected to form a plurality of oil inlet branch groups arranged at intervals along the circumferential direction.

[0017] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, wherein along the circumferential direction, the distances between at least two adjacent convex portions among the plurality of convex portions are different.

[0018] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, each of the second core parts includes a plurality of second core punchings, and each of the second core punchings includes a plurality of first oil holes; the plurality of second core punchings are stacked along the axial direction to form the second core part, so that the plurality of first oil holes are stacked accordingly along the axial direction to form the plurality of first parts.

[0019] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a motor, each of the third core parts includes a plurality of third core punchings, and each of the third core punchings includes a plurality of second oil hole groups; the plurality of third core punchings are stacked along the axial direction to form the third core part, so that the plurality of second oil hole groups are stacked accordingly along the axial direction to form the plurality of second parts, and the plurality of second parts are arranged one-to-one corresponding to the plurality of first parts.

[0020] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, each of the second oil hole groups includes a plurality of second oil holes arranged at intervals along the circumferential direction, and the plurality of second oil holes of the plurality of second oil hole groups are arranged in rows along the radial direction; along the axial direction, the projections of the plurality of second oil holes in each second part overlap, and the hole walls of the plurality of second oil holes on one side away from the shell are arranged sequentially along the first direction.

[0021] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor, wherein along the axial direction, the cross-sectional area of ​​the first oil hole is greater than or equal to the cross-sectional area of ​​the second oil hole.

[0022] By adopting the above technical solution, the flow rate of the cooling oil sprayed out from the oil spray hole can be accelerated, thereby improving the cooling efficiency of the winding.

[0023] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a stator core, wherein along the direction of gravity, the number of the second oil inlet channels located at the upper part of the stator core is greater than the number of the second oil inlet channels located at the lower part of the stator core.

[0024] By adopting the above technical solution, the cooling area of ​​the cooling oil at the upper part of the stator core in the gravity direction can be increased, thereby improving the cooling efficiency.

[0025] An embodiment of the present utility model discloses a stator core, which comprises, in order from the middle to one side along the axial direction: a first core portion, comprising a plurality of first core punching sheets stacked along the axial direction, the outer periphery of the first core punching sheets comprising a recess; a second core portion, comprising a plurality of second core punching sheets stacked along the axial direction, the second core punching sheets comprising a plurality of first oil holes arranged along the circumferential direction, the distance from the hole wall of the first oil hole away from the center of the second core punching sheet to the center of the second core punching sheet being greater than the distance from the recess of the first core punching sheet to the center of the first core punching sheet; and a third core portion, comprising a plurality of third core punching sheets stacked along the axial direction, the outer diameter of the third core punching sheets being smaller than the outer diameter of the second core punching sheets The outer diameter of the sheet, the third iron core punching sheet includes a plurality of second oil hole groups arranged along the circumferential direction, each second oil hole group includes at least two second oil holes arranged along the circumferential direction, and the distance from the hole wall of one of the at least two second oil holes close to the center of the third iron core punching sheet to the center of the third iron core punching sheet is smaller than the distance from the hole wall of the first oil hole close to the center of the second iron core punching sheet to the center of the second iron core punching sheet, and the distance from the hole wall of another of the at least two second oil holes close to the center of the third iron core punching sheet to the center of the third iron core punching sheet is smaller than the distance from the hole wall of the one second oil hole close to the center of the third iron core punching sheet to the center of the third iron core punching sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1a A cross-sectional view 1 of the motor of the present invention is shown;

[0027] Figure 1b Show Figure 1a A partial enlarged view of area A in the middle;

[0028] Figure 2 A three-dimensional diagram showing the stator core and windings of the present invention;

[0029] Figure 3 An exploded schematic diagram showing the first core portion, the second core portion, and the third core portion of the stator core of the present invention is shown;

[0030] Figure 4 A front view of a first core punching sheet of the present invention is shown;

[0031] Figure 5 Shows a front view of the second core punching sheet of the present invention;

[0032] Figure 6 Shows a front view of the third core punching sheet of the present invention;

[0033] Figure 7 Show Figure 6 A partial enlarged view of the middle B area;

[0034] Figure 8 A cross-sectional view showing the motor of the present invention Figure 2 ;

[0035] Figure 9 Show Figure 8 A partial enlarged view of the middle C area. DETAILED DESCRIPTION

[0036] The following is an explanation of the implementation of the present invention by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the utility model.

[0039] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0040] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0042] refer to Figure 1a The present application provides a motor 1, comprising: a housing 11, a stator core 2, a winding 12, and a rotor 13. The stator core 2 is disposed inside the housing 11, and the rotor 13 is disposed inside the stator core 2.

[0043] Specifically, if Figure 1a As shown in FIG, the housing 11 is provided with an oil inlet 111, and the oil inlet 111 is radially (as shown in FIG. Figure 1a The winding 12 is wound around the stator core 2 and extends in the axial direction (as shown in the Y direction). Figure 1a The rotor 13 is provided on the inner side of the stator core 2 along the axial direction X and is rotatably connected to the stator core 2. Figure 1a As shown in , the housing 11 further includes an oil outlet 112. Along the radial direction Y, the oil inlet 111 and the oil outlet 112 are respectively arranged on the upper and lower sides of the stator core 2. The number of the oil outlets 112 includes two, and the two oil outlets 112 are arranged at intervals along the axial direction X. However, the embodiment of the present application does not impose any specific restrictions on the location and number of the oil inlet 111 and the oil outlet 112, as long as the oil inlet 111 can be connected to the first oil inlet channel 211. For example, the number of the oil inlet 111 can also be two, three, four or more, and the number of the oil outlets 112 can also be one, three, four or more.

[0044] Continue to refer Figure 1a The stator core 2 includes a middle portion 20 and end portions 21. Specifically, as shown in FIG1 , along the axial direction X, the end portions 21 of the stator core 2 are arranged on opposite sides of the middle portion 20. Figure 1aAs shown in the Y direction in the middle, the portion of the end portion 21 close to the middle portion 20 (i.e., the second core portion described later) is sealed and connected to the housing 11, and the portion of the end portion 21 away from the middle portion 20 (i.e., the third core portion described later) is spaced apart from the housing 11, so that the outer peripheral surface of the middle portion 20 and the inner wall of the housing 11 jointly define a first oil inlet channel 211, and the first oil inlet channel 211 is connected to the oil inlet port 111 of the housing 11, so that cooling oil can enter the first oil inlet channel 211 located inside the housing 11 from the outside of the motor 1 through the oil inlet port 111, thereby cooling the middle portion 20 and the end portion 21 of the stator core 2.

[0045] refer to Figure 1b Combined with Figure 1a The end portion 21 includes a second oil inlet passage 212 and an oil injection hole 213. The second oil inlet passage 212 is provided inside the end portion 21 and extends in the axial direction (eg Figure 1b (as shown in the X direction in the middle), the first oil inlet channel 211 and the oil injection hole 213 are respectively arranged on opposite sides of the second oil inlet channel 212, and the first oil inlet channel 211 and the oil injection hole 213 are respectively connected to the second oil inlet channel 212, and the oil injection hole 213 is arranged on the side of the second oil inlet channel 212 away from the first oil inlet channel 211. That is, along the axial direction X, one end 21201 of the second oil inlet channel 212 is connected to the first oil inlet channel 211, and the other end 21202 of the second oil inlet channel 212 is connected to the oil injection hole 213. For example, as shown in the Figure 1a As shown in , along the axial direction X, second oil inlet channels 212 are respectively provided on both sides of the first oil inlet channel 211 of the embodiment of the present application. The portion of the second oil inlet channel 212 close to the oil injection hole 213 (i.e., the second portion described later) extends along the first direction (as shown in the direction P in FIG1 ), and the oil injection hole 213 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 inlet channel 211 can pass through the second oil inlet channel 212 and be ejected from the oil injection hole 213, so that the cooling oil can be sprayed along the first direction P onto the winding 12 wound on the stator core 2 (i.e., the direction of the cooling oil is: a→b→c→d→e→f, as shown in FIG1 ). Figure 1b The winding 12 is cooled down.

[0046] Figure 2 A perspective view of the stator core 2 and the winding 12 according to an embodiment of the present application is shown.

[0047] refer to Figure 2 Combined with Figure 1a and Figure 1b The middle portion 20 of the stator core 2 further includes a spoiler 214 .

[0048] Specifically, if Figure 2 As shown in FIG, the middle portion 20 is circumferentially (as Figure 2The first oil inlet passage 211 is arranged around the middle portion 20 in the circumferential direction R, and the spoiler 214 is provided in the first oil inlet passage 211. The spoiler 214 is protruded from the outer surface of the middle portion 20 in the circumferential direction R and is located in the first oil inlet passage 211.

[0049] The spoiler 214 includes a plurality of protrusions 2141. The plurality of protrusions 2141 define a plurality of oil inlet branches 2111 in communication with the housing 11 in the first oil inlet channel 211. Along the circumferential direction R, adjacent protrusions 2141 define an oil inlet branch 2111. The oil inlet branch 2111 is axially (e.g., Figure 2 The plurality of oil inlet branches 2111 are respectively connected to the second oil inlet channel 212.

[0050] Thus, the embodiment of the present application divides the first oil inlet channel 211 of the embodiment of the present application into multiple oil inlet branches 2111 through the spoiler 214. After the cooling oil enters the first oil inlet channel 211 from the oil inlet 111, it passes through the multiple oil inlet branches 2111, and the oil route is converted from one route to multiple routes (such as Figure 2 The cooling oil is directed by the plurality of protrusions 2141 of the flow spoiler 214 (indicated by the dashed arrows in the middle). The multiple protrusions 2141 of the flow spoiler 214 change the flow direction of the cooling oil (for example, from axial flow X to circumferential flow R), allowing the cooling oil to continuously contact the stator core 2, thereby enhancing heat transfer efficiency and providing a continuous cooling effect on the outer surface of the intermediate portion 20 of the stator core 2. Ultimately, after passing through the multiple oil inlet branches 2111, the cooling oil enters the second oil inlet channel 212 and is sprayed onto the winding 12 from the oil spray holes 213, mitigating the temperature rise of the winding 12.

[0051] Furthermore, compared with the existing oil injection pipe solution and oil guide ring solution, the embodiment of the present application uses a series structure of the first oil inlet channel 211, the spoiler 214, the second oil inlet channel 212 and the oil injection hole 213 to simultaneously achieve cooling of the stator core 2 and the winding 12 with a smaller flow rate, thereby reducing costs and effectively improving the cooling effect of the stator core 2 and the winding 12.

[0052] 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.

[0053] Figure 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.

[0054] refer to Figure 3 Combined with Figure 2 The middle portion 20 further includes a first core portion 201 , the end portion 21 further includes a second core portion 202 and a third core portion 203 , and the second oil inlet channel 212 includes a first portion 2121 and a second portion 2122 .

[0055] Specifically, if Figure 3 As shown in Figure 3 The middle portion 20 (ie, the first core portion 201) and the third core portion 203 are respectively provided on opposite sides of the second core portion 202. The flow-disturbing portion 214 is provided protrudingly on the circumference of the first core portion 201 (eg, Figure 3 The outer surface of the second core portion 202 is shown in the R direction. The second core portion 202 includes a plurality of first portions 2121 spaced apart along the circumferential direction R within the second core portion 202, and the first portions 2121 extend along the axial direction X. The third core portion 203 includes a plurality of second portions 2122 spaced apart along the circumferential direction R within the third core portion 203, and the plurality of oil injection holes 213 are in one-to-one communication with the plurality of second portions 2122.

[0056] Continue to refer Figure 3 The oil inlet branch 2111 and the second portion 2122 are respectively arranged on opposite sides of the first portion 2121. Moreover, at least some of the second portions 2122 are in communication with the first portions 2121. Figure 3 As shown in the figure, the second core portion 202 located on the axial X side of the first core portion 201 has 16 first parts 2121, and the third core portion 203 has 48 second parts 2122. The number of the second parts 2122 is greater than the number of the second core portion 202. Then, 16 of the 48 second parts 2122 are arranged in a one-to-one correspondence with the corresponding 16 first parts 2121 to form a second oil inlet channel 212 that is interconnected with the first oil inlet channel 211 and the oil injection hole 213.

[0057] However, the embodiment of the present application does not specifically limit the number of the second part 2122 and the first part 2121, as long as multiple first parts 2121 can be connected to multiple second parts 2122, so that the cooling oil can flow from the first part 2121 through the second part 2122 and then be sprayed onto the winding 12 from the oil spray hole 213.

[0058] Continue to refer Figure 3 In some possible implementations, the number of the first core parts 201 includes multiple ones.

[0059] Specifically, if Figure 3As shown in FIG, a plurality of first core portions 201 are stacked along the axial direction X. For example, along the axial direction X, the projections of the protrusions 2141 of any two adjacent first core portions 201 among the plurality of first core portions 201 do not overlap, so that the oil inlet branches 2111 of adjacent first core portions 201 are staggered and connected in the axial direction X, thereby forming a plurality of oil inlet branch groups 21110 ( Figure 3 Not shown, see Figure 2 ). However, the embodiment of the present application does not make any specific arrangements for the structure of the stacked arrangement of the multiple first core portions 201, as long as a plurality of oil inlet branch groups 21110 that are interconnected with the second oil inlet channel 212 can be formed. For example, along the axial direction X, the projections of the convex portions 2141 of each of the multiple first core portions 201 may overlap with each other. Alternatively, the projections of the convex portions 2141 of at least two of the multiple first core portions 201 may not overlap, etc.

[0060] For example, refer to Figure 3 , 11 first core parts 201 are stacked along the axial direction X; but not limited thereto, the embodiment of the present application does not impose a specific limit on the number of the plurality of first core parts 201. For example, it can also be 2, 3, 4, 5, 6, 15 or more.

[0061] Figure 4 A front view of a first core punching sheet according to an embodiment of the present application is shown.

[0062] refer to Figure 4 Combined with Figure 3 Each first core portion 201 includes a plurality of first core punching sheets 2011 .

[0063] Specifically, if Figure 4 As shown in FIG, each first core punching sheet 2011 has a circumferential direction (such as Figure 4 A plurality of protrusions 21411 and recesses 21412 are provided (shown in the R direction in the middle), the protrusions 21411 are protruding from the first core punching sheet 2011, and recesses 21412 are formed between adjacent protrusions 21411. That is, a plurality of recesses 21412 spaced apart along the circumferential direction R are formed between the plurality of protrusions 21411.

[0064] For example, the height of the protrusion 21411 is configured to enable the protrusion 2141 to be aligned with the housing 11 (not shown in the figure, see Figure 8 ) sealed connection; but not limited to this, the embodiment of the present application does not impose any specific restriction on the height of the protrusion 21411, as long as the oil inlet branch 2111 can be formed to change the flow direction of the cooling oil.

[0065] Continue to refer Figure 4 Combined with Figure 3The plurality of first core punching sheets 2011 are stacked in the axial direction X to form the first core portion 201 , so that the plurality of protrusions 21411 are stacked in the axial direction X to form a plurality of protrusions 2141 . Furthermore, the plurality of recesses 21412 formed between the plurality of protrusions 21411 are stacked in the axial direction X to form a plurality of oil inlet branches 2111 .

[0066] For example, along the circumferential direction R, the length of two adjacent recesses 21412 in the plurality of protrusions 2141 (e.g. Figure 4 The lengths of the recesses 21412 are not limited to L1 and L2; however, this is not a limitation. The present embodiment does not impose any specific restrictions on the lengths of the recesses 21412. For example, the lengths of all recesses 21412 may be the same (i.e., the distance between any two adjacent protrusions 2141 is the same). Alternatively, the lengths of at least two adjacent recesses 21412 may be different (i.e., the distance between at least two adjacent protrusions 2141 is different).

[0067] It should be noted that the embodiment of the present application does not limit the number of first core punches 2011 stacked in each first core portion 201, and can be specifically set according to actual conditions. For example, the number of first core punches 2011 stacked in each first core portion 201 can be the same, that is, 20. Alternatively, the number of first core punches 2011 stacked in each first core portion 201 can be different. Alternatively, the number of first core punches 2011 stacked in any two first core portions 201 can be different, that is, 15 and 25, respectively.

[0068] Figure 5 A front view of a second core punching sheet according to an embodiment of the present application is shown.

[0069] refer to Figure 5 Combined with Figure 3 Each second core portion 202 includes a plurality of second core punching sheets 2021 .

[0070] Specifically, if Figure 5 As shown in FIG, each second core punching sheet 2021 includes a plurality of first oil holes 21211, and the plurality of first oil holes 21211 are arranged along the circumference of the second core punching sheet 2021 (eg, Figure 5 Each first oil hole 21211 is spaced away from the center of the second core punching sheet 2021 (as shown in the R direction). Figure 5 The distance from the hole wall of the first oil hole 21211 to the center O of the second core punching sheet 2021 is greater than the distance from the bottom wall of the recess 21412 of the first core punching sheet 2011 to the center of the first core punching sheet 2011 (as shown in the figure). Figure 4 The distance is shown as point O in the figure.

[0071] For example, each second core punching sheet 2021 includes 16 first oil holes 21211, and along the direction of gravity (such as Figure 5 G direction), located on the upper part of the stator core 2 (as shown in Figure 5 The number of the first oil holes 21211 (above the dotted line) is 10, which are located at the lower part of the stator core 2 (such as Figure 5 The number of first oil holes 21211 (the portion below the dashed line) is six. That is, the number of first oil holes 21211 located in the upper portion of the stator core 2 is greater than the number of first oil holes 21211 located in the lower portion of the stator core 2, thereby forming more first portions 2121 in the upper portion of the stator core 2. However, this is not limiting, and the present embodiment does not impose a specific limit on the number of first oil holes 21211 in each second core punching 2021.

[0072] Continue to refer Figure 5 Combined with Figure 3 The plurality of second core punching sheets 2021 are arranged in an axial direction (eg Figure 3 The stator core 202 is stacked with the plurality of first oil holes 21211 along the axial direction X to form a plurality of first parts 2121, and the stator core 2 is connected to the stator core 2 by the plurality of first oil holes 21211. The stator core 202 is connected to the plurality of first oil holes 21211 along the axial direction X to form a plurality of first parts 2121. In addition, the stator core 2 is connected to the plurality of first oil holes 21211 by the plurality of first oil holes 21211. The stator core 2 is connected to the plurality of first parts 2121 by the plurality of first oil holes 21211.

[0073] Figure 6 A front view of a third core punching sheet according to an embodiment of the present application is shown.

[0074] refer to Figure 6 Combined with Figure 3 Each third core portion 203 includes a plurality of third core punching sheets 2031 .

[0075] Specifically, if Figure 6 As shown in FIG, each third core punching sheet 2031 includes a plurality of second oil hole groups 21220, and the plurality of second oil hole groups 21220 are arranged along the circumference of the third core punching sheet 2031 (eg, Figure 6 For example, refer to Figure 7 Combined with Figure 6Each second oil hole group 21220 includes three second oil holes 21221 spaced apart along the circumferential direction R. The included angle between adjacent second oil holes 21221 is α, where α = 360 / n degrees, where n is the number of winding slots. However, this embodiment of the present application does not limit the number of second oil holes 21221 in each second oil hole group 21220. For example, the number of second oil holes 21221 can be two, four, five, six, seven, or more.

[0076] Continue to refer Figure 6 Combined with Figure 3 The above-mentioned multiple third core punching sheets 2031 are stacked along the axial direction X to form the third core part 203, so that the multiple second oil hole groups 21220 are stacked accordingly along the axial direction X to form multiple second parts 2122, and the multiple second parts 2122 are arranged in a one-to-one correspondence with the multiple first parts 2121.

[0077] For example, each third core punching sheet 2031 includes 16 second oil hole groups 21220, and along the direction of gravity (such as Figure 6 (As shown in the direction G in the middle), the number of second oil hole groups 21220 located in the upper portion of the stator core 2 is ten, and the number of second oil hole groups 21220 located in the lower portion of the stator core 2 is six. That is, the number of second oil hole groups 21220 located in the upper portion of the stator core 2 is greater than the number of second oil hole groups 21220 located in the lower portion of the stator core 2, thereby forming more second portions 2122 in the upper portion of the stator core 2. In other words, more second oil inlet channels 212 are formed in the upper portion of the stator core 2.

[0078] Thus, in some possible implementations, reference Figure 3 Combined with Figure 5 and Figure 6 , along the direction of gravity (such as Figure 6 As shown in the direction G in the middle, the number of the second oil inlet channels 212 located in the upper part of the stator core 2 is greater than the number of the second oil inlet channels 212 located in the lower part of the stator core 2, so as to increase the cooling area of ​​the cooling oil in the upper part of the stator core 2 in the gravity direction G and improve the cooling efficiency.

[0079] For example, continue to refer to Figure 7 The three second oil holes 21221 in the second oil hole group 21220 are arranged along the radial direction of the stator core 2 (e.g. Figure 7 That is, the corresponding second oil holes 21221 in two adjacent second oil hole groups 21220 are located at the same position in the radial direction Y (as shown in the Y direction). Figure 7 That is, the plurality of second oil holes 21221 of the plurality of second oil hole groups 21220 are arranged in a row along the radial direction Y of the stator core.

[0080] Thus, reference Figure 8 and Figure 9 By rotating the plurality of third core punching sheets 2031, the plurality of third core punching sheets 2031 can be moved along the axial direction (eg Figure 8 and Figure 9 The third core portion 203 is formed by stacking the plurality of second oil holes 21221 in each second portion 2122 so that the projections of the plurality of second oil holes 21221 overlap, and the hole walls 21222 on one side of the plurality of second oil holes 21221 away from the housing 11 are aligned along the first direction (as shown in the X direction). Figure 8 and Figure 9 In other words, one of the second oil holes 21221 is close to the center of the third core punching sheet 2031 (as shown in the P direction). Figure 6 The distance from the hole wall of the second oil hole 21221 (i.e., the hole wall 21222 of the second oil hole 21221 away from the housing 11) to the center O of the third core punching sheet 2031 is smaller than the distance from the hole wall of the first oil hole 21211 close to the center O of the second core punching sheet 2021 (i.e., the inner hole wall of the first oil hole 21211) to the center O of the second core punching sheet 2021, and the remaining second oil holes 21221 close to the center of the third core punching sheet 2031 (i.e., the inner hole wall of the first oil hole 21211) are smaller than the distance from the hole wall of the first oil hole 21211 close to the center O of the second core punching sheet 2021 Figure 6 The distance from the hole wall of the second oil hole 21221 (as shown by point O in the middle) (i.e., the hole wall 21222 on the side away from the shell 11) to the center O of the third core punching sheet 2031 decreases successively, so that the second part 2122 extends along the first direction P, and the first direction P intersects the axial direction X.

[0081] For example, Figure 9 and Figure 8 As shown in the figure, the bottom walls of the three second oil holes 21221 are arranged in sequence along the first direction P, so that the second part 2122 of the second oil inlet channel 212 is configured to be arranged along the first direction P toward the winding 12, so that the cooling oil can be sprayed onto the winding 12 through the oil spray hole 213 (that is, the second oil hole 21221 located on the outermost side in the second part 2122) to cool the winding 12.

[0082] For example, Figure 7As shown in , each second oil hole group 21220 includes three square second oil holes 21221. However, this is not limiting. The present embodiment of the application does not impose specific restrictions on the number of second oil holes 21221 included in each second oil hole group 21220 or the shape of the second oil holes 21221. For example, each second oil hole group 21220 may include two, four, five, six, or more second oil holes 21221, and the shape of each second oil hole 21221 may also include circular, triangular, polygonal, or other shapes. It should be noted that the present embodiment of the application does not impose specific restrictions on the extension direction of the second portion 2122 (i.e., the first direction P), as long as the cooling oil can be sprayed from the oil injection hole 213 onto the winding 12. For example, the extension direction (i.e., the first direction) of the second portion 2122 may also not intersect with the axial direction of the stator core 2; or, when the outer diameter of the winding 12 is larger than the diameter of the position of the oil injection hole 213 located in the stator core 2, the extension direction (i.e., the first direction) of the second portion 2122 may also be parallel to the axial direction of the stator core 2.

[0083] Continue to refer Figure 8 and Figure 9 In some possible embodiments, the second core portion 202 is sealedly connected to the housing 11 so that the cooling oil in the first oil inlet channel 211 can only pass through the second oil inlet channel 212 and be sprayed onto the winding 12 from the oil spray hole 213 along the first direction P. For example, the difference between the diameter of the second core portion 202 and the inner diameter of the housing 11 is 2 mm, and the second core portion 202 is interference-connected to the housing 11. However, the embodiment of the present application does not impose any specific restrictions on the size of the second core portion 202 or the connection method between the second core portion 202 and the housing 11, as long as the second core portion 202 and the housing 11 can be sealed.

[0084] In addition, if Figure 9 As shown in FIG, the third core portion 203 is spaced apart from the housing 11 along the radial direction Y. For example, the outer diameter of the third core portion 203 is smaller than the inner diameter of the housing 11 to reduce production material costs and allow for greater flexibility in the placement of the second oil holes 21221. However, this embodiment of the present application does not impose any specific restrictions on the size of the third core portion 203, as long as the second portion 2122 of the second oil inlet channel 212 facing the winding direction is formed.

[0085] For example, in some possible implementations, reference Figure 9 Combined with Figure 5 and Figure 6Along the axial direction X, the cross-sectional area of ​​the first oil hole 21211 is greater than the cross-sectional area of ​​the second oil hole 21221, thereby increasing the flow rate of the cooling oil ejected from the oil injection hole 213 and improving cooling efficiency. However, the embodiment of the present application does not impose any specific limitation on the quantitative relationship between the cross-sectional area of ​​the first oil hole 21211 and the cross-sectional area of ​​the second oil hole 21221, as long as the cross-sectional area of ​​the first oil hole 21211 is greater than or equal to the cross-sectional area of ​​the second oil hole 21221.

[0086] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the present invention should not be construed as being limited to these descriptions. Those skilled in the art may make various changes in form and detail, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A motor, characterized in that: include: A housing, wherein the housing is provided with an oil inlet; a stator core, the stator core being arranged inside the housing; windings, the windings being arranged on the stator core; In the radial direction, the middle portion of the stator core and the housing jointly define a first oil inlet passage. The first oil inlet passage circumferentially surrounds the middle portion and is in communication with the oil inlet of the housing. The middle portion includes a flow spoiler, which defines a plurality of interconnected oil inlet branches in the first oil inlet passage. In the axial direction, ends of the stator core are arranged on opposite sides of the middle portion, part of the ends are sealedly connected to the housing, and the ends include a second oil inlet channel and an oil injection hole; Along the axial direction, one end of the second oil inlet passage is communicated with the oil inlet branch, and the other end of the second oil inlet passage is communicated with the oil injection hole.

2. The motor according to claim 1, characterized in that Along the axial direction, a portion of the second oil inlet passage adjacent to the oil injection hole is configured to be disposed toward the winding along a first direction, where the first direction intersects the axial direction.

3. The motor according to claim 1, characterized in that Along the axial direction, a portion of the end portion close to the middle portion is sealed and connected to the housing, and a portion of the end portion away from the middle portion is spaced apart from the housing.

4. The motor according to any one of claims 1 to 3, characterized in that The middle portion further includes a first core portion, and the flow spoiler is protruding from the outer surface of the first core portion; wherein, The flow spoiler includes a plurality of convex portions, which are arranged at intervals along the circumferential direction, and adjacent convex portions define the oil inlet branch path, which extends along the axial direction.

5. The motor according to any one of claims 1 to 3, characterized in that The end portion further includes a second core portion and a third core portion, and the second oil inlet passage includes a first portion and a second portion; Along the axial direction, the middle portion and the third core portion are respectively arranged on opposite sides of the second core portion, the second core portion is sealed and connected to the housing, the oil inlet branch is connected to the first portion, and the oil injection hole is connected to the second portion; wherein, The second core portion includes a plurality of the first portions, the plurality of the first portions being spaced apart on the second core portion along the circumferential direction, and the first portions extending along the axial direction; The third core portion includes a plurality of second portions, which are spaced apart from each other along the circumferential direction. At least some of the second portions are connected to the first portions, and the second portions extend along the first direction.

6. The motor according to claim 4, characterized in that The first core portion includes a plurality of first core punching sheets, and each of the first core punching sheets is provided with a plurality of protrusions at intervals in the circumferential direction; The plurality of first core punching sheets are stacked in the axial direction to form the first core portion, so that the plurality of protrusions are stacked in the axial direction to form the plurality of protrusions.

7. The motor according to claim 6, characterized in that The number of the first core parts includes a plurality, and the plurality of first core parts are arranged along the axial direction; wherein, Along the axial direction, projections of the protruding portions of at least two of the plurality of first core portions do not overlap.

8. The motor according to claim 7, characterized in that Along the circumferential direction, distances between at least two adjacent convex portions among the plurality of convex portions are different.

9. The motor according to claim 5, characterized in that Each of the second core parts includes a plurality of second core punching sheets, and each of the second core punching sheets includes a plurality of first oil holes; The plurality of second core punching sheets are stacked along the axial direction to form the second core portion, so that the plurality of first oil holes are stacked correspondingly along the axial direction to form the plurality of first portions.

10. The motor according to claim 9, characterized in that Each of the third core parts includes a plurality of third core punching sheets, and each of the third core punching sheets includes a plurality of second oil hole groups; The plurality of third core punching sheets are stacked along the axial direction to form the third core part, so that the plurality of second oil hole groups are stacked correspondingly along the axial direction to form the plurality of second parts, and the plurality of second parts are arranged in one-to-one correspondence with the plurality of first parts.

11. The motor according to claim 10, characterized in that Each of the second oil hole groups includes a plurality of second oil holes spaced apart along the circumferential direction, and the plurality of second oil holes in the plurality of second oil hole groups are arranged in a row along the radial direction; Along the axial direction, projections of the plurality of second oil holes in each second portion overlap, and hole walls of the plurality of second oil holes on a side away from the housing are sequentially arranged along the first direction.

12. The motor according to claim 11, characterized in that Along the axial direction, a cross-sectional area of ​​the first oil hole is greater than or equal to a cross-sectional area of ​​the second oil hole.

13. The motor according to any one of claims 1 to 3, characterized in that Along the gravity direction, the number of the second oil inlet channels located at the upper portion of the stator core is greater than the number of the second oil inlet channels located at the lower portion of the stator core.

14. A stator core, characterized in that: The stator core includes, in order from the middle to one side along the axial direction: A first core portion includes a plurality of first core punching sheets stacked along the axial direction, wherein outer circumferences of the first core punching sheets include recessed portions; a second core portion, comprising a plurality of second core punchings stacked in the axial direction, the second core punchings comprising a plurality of first oil holes arranged in the circumferential direction, wherein a distance from a hole wall of the first oil hole away from a center of the second core punching to the center of the second core punching is greater than a distance from a recess of the first core punching to the center of the first core punching; and The third core part includes a plurality of third core punches stacked along the axial direction, the outer diameter of the third core punches is smaller than the outer diameter of the second core punches, the third core punches include a plurality of second oil hole groups arranged along the circumferential direction, each second oil hole group includes at least two second oil holes arranged along the circumferential direction, the distance from the hole wall of one of the at least two second oil holes close to the center of the third core punch to the center of the third core punch is smaller than the distance from the hole wall of the first oil hole close to the center of the second core punch to the center of the second core punch, and the distance from the hole wall of another of the at least two second oil holes close to the center of the third core punch to the center of the third core punch is smaller than the distance from the hole wall of the one second oil hole close to the center of the third core punch to the center of the third core punch.

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