Stator core and motor

Abstract

The utility model discloses a stator iron core and a motor, the stator iron core comprises a first iron core punching sheet group, the first iron core punching sheet group comprises a plurality of first iron core punching sheets which are stacked along the axial direction, each first iron core punching sheet comprises a plurality of first oil inlet grooves which are arranged at intervals along the circumferential direction, and the first oil inlet grooves extend inwards from the periphery of the first iron core punching sheets; each first oil inlet groove comprises a first oil inlet and a closed end which are arranged from outside to inside, the sectional area of the first oil inlet is smaller than that of the closed end, and the first oil inlet grooves of every two adjacent first iron core punching sheets are in one-to-one correspondence in the axial direction to form a plurality of first oil inlet channels. According to the utility model, on the premise of ensuring the cooling of the stator core and the winding, the contact area between the stator core and the shell can be increased, the friction force between the stator core and the shell is improved, relative slippage does not occur between the stator core and the shell in the operation process of the motor, and the safety coefficient is higher.

Description

Technical Field

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

[0002] Existing motor cooling solutions typically include two approaches. One involves deploying oil spray pipes to spray the windings. However, due to the large size of these pipes, the cooling structure occupies a large space and results in uneven cooling. The other cooling solution involves installing oil grooves axially along the core yoke and placing perforated oil rings at the ends of the core to cool the windings. However, the need for additional oil rings complicates the assembly process and increases material costs.

[0003] To address the cooling issues of the two motors mentioned above, technicians have provided a new stator core solution. This involves extending multiple oil inlet channels inward from the periphery of the central stator core, which then supply oil to the oil injection channels of the end stator cores. Finally, cooling oil is sprayed from the oil injection channels onto the windings. Because this cooling method requires multiple oil inlet grooves extending inward from the periphery of the stator core punchings, the contact area between the stator core and the housing is inevitably reduced, thereby reducing the friction between the stator core and the housing. High torque during motor operation may cause relative slip between the stator core and the housing, affecting the safety factor. Utility Model Content

[0004] The present utility model aims to address the problem of existing oil inlet grooves in the stator core affecting friction with the housing. This utility model provides a stator core and motor that, while ensuring cooling of the stator core and windings, increases the contact area between the stator core and the housing, improving friction between the stator core and the housing. During motor operation, relative slippage between the stator core and the housing is prevented, resulting in a higher safety factor, thereby better ensuring the motor's torque output and heat dissipation performance, and correspondingly reducing electromagnetic losses.

[0005] In order to solve the above technical problems, an embodiment of the present utility model discloses a stator core, including: a first core punching group, the first core punching group including a plurality of first core punchings stacked along the axial direction, each of the first core punchings including a plurality of first oil inlet grooves arranged at intervals around the circumference, the first oil inlet grooves extending inward from the periphery of the first core punching, the first oil inlet grooves including a first oil inlet port and a closed end arranged from the outside to the inside, the cross-sectional area of ​​the first oil inlet port being smaller than the cross-sectional area of ​​the closed end, and along the axial direction, the plurality of first oil inlet grooves of two adjacent first core punchings corresponding one to one to form a plurality of first oil inlet channels.

[0006] With the above-mentioned technical solution, the cross-sectional area of ​​the first oil inlet is smaller than that of the closed end. Compared to a design where the oil inlet size is equal to the closed end size, the distance between two adjacent first oil inlets in this technical solution is greater than the distance between two adjacent oil inlets in this design. Therefore, in this technical solution, the smaller first oil inlet can increase the contact area between the stator core and the housing, improving the friction between the stator core and the housing. During motor operation, there is no relative slippage between the stator core and the housing, resulting in a higher safety factor, thereby better ensuring the motor's torque output and heat dissipation performance.

[0007] Furthermore, as the slotted area of ​​the first oil inlet groove of the first core punching sheet increases in the direction of the axis, the magnetic circuit within the stator core changes. The stator core's function is to guide and concentrate the magnetic field. An increase in the slotted area means a change in the magnetic resistance of the magnetic circuit. According to Ohm's law of magnetic circuits, magnetic flux equals magnetomotive force divided by magnetic resistance. An increase in slotted area increases magnetic resistance. If the magnetomotive force remains unchanged, the magnetic flux decreases accordingly, significantly impacting the electromagnetic intensity. Therefore, a smaller first oil inlet can reduce the slotted area, which in turn reduces the impact on electromagnetic intensity and reduces electromagnetic losses.

[0008] According to another specific embodiment of the present utility model, the first oil inlet groove includes a first part and a second part, the first part includes the first oil inlet, the second part includes a connecting portion connected to the closed end and the closed end, the connecting portion is a constant cross-section body, and the cross-sectional size of the first part gradually increases in the radial inward direction.

[0009] By adopting the above technical solution, the first oil inlet satisfies that the cooling oil can enter the first oil inlet channel through the first oil inlet, and the uniform cross-section of the connecting portion satisfies that the cooling oil can flow in the first oil inlet channel.

[0010] According to another specific embodiment of the present invention, the stator core includes a second core punching group, and the second core punching group is respectively provided at both ends of the first core punching group. The second core punching group includes a plurality of oil injection channels arranged around the circumference, and the plurality of oil injection channels are respectively connected to the plurality of first oil inlet channels in a one-to-one correspondence and are staggered in the axial direction.

[0011] With this technical solution, cooling oil enters the first oil inlet channel from the first oil inlet and then flows into the oil injection channel. The angle formed by the axial misalignment between the oil injection channel and the first oil inlet channel allows the cooling oil to be ejected from the oil injection channel at a specific angle onto the winding, cooling the winding.

[0012] Compared to straight, flush channels, the cooling oil's cooling path within the oil injection channel is effectively increased, thereby increasing the cooling oil's heat exchange time and improving the cooling effect. Furthermore, if the oil injection channel and the first oil inlet channel are not axially misaligned but directly connected, the cooling oil will be ejected directly in a direction parallel to the axial direction, potentially preventing the cooling oil from reaching the windings.

[0013] According to another specific embodiment of the present invention, the second core punching sheet group includes a plurality of second core punching sheets stacked along the axial direction, each of the second core punching sheets includes a plurality of oil injection holes arranged at intervals around the circumference, and along the axial direction, the plurality of oil injection holes of two adjacent second core punching sheets correspond one to one to form the plurality of oil injection channels, and each of the oil injection holes partially overlaps with the second part of the corresponding first oil inlet groove.

[0014] According to another specific embodiment of the present invention, each of the first core punching sheets is provided with a plurality of protrusions spaced apart along the circumferential direction, the protrusions are spaced apart from the first oil inlet grooves, and along the axial direction, the plurality of protrusions of two adjacent first core punching sheets correspondingly form a plurality of convex portions;

[0015] The number of the first core punching sheet groups includes multiple, and the multiple first core punching sheet groups are arranged along the axial direction. In the radial direction, the multiple first core punching sheet groups and the external shell define a second oil inlet channel extending along the circumferential direction, and the multiple protrusions are in contact with the inner wall of the external shell to define a plurality of mutually connected oil inlet branches in the second oil inlet channel, and the multiple first oil inlet channels are connected to the multiple oil inlet branches.

[0016] By adopting the above technical solution, the second oil inlet channel is divided into multiple oil inlet branches through multiple protrusions, so that the cooling oil route passing through multiple oil inlet branches is converted from one route to multiple routes, so that the cooling oil can continuously contact the multiple first iron core punching sheet groups to enhance the efficiency of heat conduction, and can form a continuous cooling effect on the outer surfaces of the multiple first iron core punching sheet groups.

[0017] The cooling oil flows through a plurality of oil inlet branches, a plurality of first oil inlet channels and a plurality of oil spray channels in the stator core in sequence, and is finally sprayed onto the winding to reduce the temperature of the winding.

[0018] In addition, multiple first core punching sheets are formed into a first core punching sheet group by welding protrusions, and the protrusions are spaced apart from the first oil inlet groove to avoid welding the first oil inlet port when welding the protrusions, so that the cooling oil cannot enter the first oil inlet channel.

[0019] According to another specific embodiment of the present invention, along the axial direction, projections of the protrusions of at least two of the plurality of first core punching sheet groups do not overlap.

[0020] By adopting the above technical solution, the oil inlet branches of adjacent first core punching sheet groups can be staggered in the axial direction and connected to form a plurality of oil inlet branches spaced apart along the circumferential direction.

[0021] According to another specific embodiment of the present invention, along the direction of gravity, the number of the first oil inlet grooves located on the upper part of the first core punching sheet is greater than the number of the first oil inlet grooves located on the lower part of the first core punching sheet.

[0022] 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.

[0023] According to another specific embodiment of the present invention, along the direction of gravity, the number of the oil injection holes located on the upper portion of the second core punching sheet is greater than the number of the oil injection holes located on the lower portion of the second core punching sheet.

[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] According to another specific embodiment of the present invention, the stator core further includes a third core punching group, and along the axial direction, the first core punching group is respectively provided at both ends of the third core punching group; wherein,

[0026] The third core punching sheet group, the first core punching sheet groups at both ends, and the outer shell together define a third oil inlet channel, the third oil inlet channel extending along the circumferential direction, and the third oil inlet channel communicating with the plurality of first oil inlet channels;

[0027] The third core punching sheet group includes a plurality of third core punching sheets stacked along the axial direction. The outer diameter of the third core punching sheets is smaller than the outer diameter of the first core punching sheets.

[0028] By adopting the above technical solution, the cooling oil flows from the second oil inlet to the third oil inlet channel, and then enters the interior of the stator core from the multiple first oil inlet channels.

[0029] According to another specific embodiment of the present invention, the first core punching sheet also includes a plurality of welding grooves spaced apart around the circumference, the welding grooves are spaced apart from the first oil inlet groove, and the plurality of welding grooves of two adjacent first core punching sheets correspond one to one to form a plurality of weld beads.

[0030] The embodiment of the present utility model further discloses a motor, comprising:

[0031] The stator core according to any of the preceding items;

[0032] a winding connected to the slot portion of the stator core;

[0033] The stator core is arranged in the housing, the housing is connected to the stator core, and the housing includes a second oil inlet, which is communicated with the first oil inlet channel.

[0034] According to another specific embodiment of the present invention, the second oil inlet is connected to multiple oil inlet branches formed by the stator core, and external cooling oil flows through the second oil inlet, the multiple oil inlet branches, the first oil inlet channel and the oil injection channel in sequence.

[0035] According to another specific embodiment of the present invention, the second oil inlet is connected to the third oil inlet channel formed by the stator core, and external cooling oil flows through the second oil inlet, the third oil inlet channel, the first oil inlet channel and the oil injection channel in sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1A A schematic diagram of a motor according to a first embodiment of the present invention is shown.

[0037] Figure 1B Showing the first embodiment of the present utility model Figure 1A A partial enlarged view of area A in the middle.

[0038] Figure 1C Showing the first embodiment of the present utility model Figure 1B A partial enlarged view of area B in the middle.

[0039] Figure 2 A schematic diagram of the connection between the stator core and the winding according to an embodiment of the present invention is shown.

[0040] Figure 3 An exploded view of a stator core according to an embodiment of the present invention is shown.

[0041] Figure 4A A schematic diagram of the first core punching sheet of the first embodiment of the present invention is shown.

[0042] Figure 4B Showing the first embodiment of the present utility model Figure 4A A partial enlarged view of the middle C area.

[0043] Figure 5 A schematic diagram of the second core punching sheet of the first embodiment of the present invention is shown.

[0044] Figure 6 A schematic diagram of a motor according to a second embodiment of the present invention is shown.

[0045] Figure 7 A three-dimensional view of the stator core of the second embodiment of the present invention is shown.

[0046] Figure 8 An exploded view of the stator core of the second embodiment of the present invention is shown.

[0047] Figure 9 A schematic diagram of the first core punching sheet of the second embodiment of the present invention is shown.

[0048] Figure 10 A schematic diagram of the second core punching sheet of the second embodiment of the present invention is shown.

[0049] Figure 11 A schematic diagram of the third core punching sheet of the second embodiment of the present invention is shown.

[0050] Description of Reference Numerals

[0051] stator core 10;

[0052] Groove 11;

[0053] Tooth 12;

[0054] First oil inlet channel 13;

[0055] Oil injection channel 14;

[0056] First core punching sheet group 15;

[0057] First core punching sheet 151;

[0058] First oil inlet groove 1511; first oil inlet port 15111; closed end 15112; first portion 15113; second portion 15114; connecting portion 151141;

[0059] protrusion 1512;

[0060] Welding groove 1513;

[0061] convex portion 152;

[0062] Second oil inlet channel 153; oil inlet branch 1531;

[0063] The second core punching sheet group 16;

[0064] Second core punching sheet 161; oil injection hole 1611;

[0065] The third core punching sheet group 17;

[0066] The third core punching sheet 171;

[0067] A third oil inlet passage 18;

[0068] Weld pass 19;

[0069] Winding 20;

[0070] Housing 30; second oil inlet 31. DETAILED DESCRIPTION

[0071] 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.

[0072] 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.

[0073] 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.

[0074] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0075] 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.

[0076] 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.

[0077] refer to Figures 1A to 2 The present application provides a motor, comprising a stator core 10, a winding 20, and a housing 30. In a specific example, the stator core 10 comprises forty-eight slots 11 and forty-eight teeth 12. The winding 20 is disposed in the slots 11 of the stator core 10 and can abut against the teeth 12. The stator core 10 is disposed within the housing 30, which is connected to the stator core 10 and includes a second oil inlet 31. The stator core 10 comprises a plurality of first oil inlet channels 13 arranged in a circumferential direction R and a plurality of oil injection channels 14 arranged in the circumferential direction R. The plurality of oil injection channels 14 arranged in the circumferential direction R are respectively disposed at both ends of the plurality of first oil inlet channels 13 along the axial direction X, and the oil injection channels 14 extend in a first direction P near one end of the first oil inlet channels 13. The plurality of oil injection channels 14 are connected to the plurality of first oil inlet channels 13 in a one-to-one correspondence, and the plurality of first oil inlet channels 13 are connected to the second oil inlet 31.

[0078] With the above technical solution, the cooling oil flows from the second oil inlet 31 of the housing 30 into the stator core 10 in the radial direction Y (i.e., the direction of the cooling oil is: a→b), enters the multiple first oil inlet channels 13 to the left and right in the stator core 10 respectively (i.e., the direction of the cooling oil is: b→c), and is then sprayed from the multiple oil injection channels 14 along the first direction P onto the winding 20 (i.e., the direction of the cooling oil is: c→d→e) to reduce the temperature of the winding 20.

[0079] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of slots 11 and teeth 12 of the stator core 10. For example, in other possible embodiments, the number of slots 11 and teeth 12 of the stator core 10 can be twenty-four, fifty-four, seventy-two, etc., respectively. The embodiment of the present application does not impose any specific limitation on the number of first oil inlet channels 13. For example, in other possible embodiments, the number of first oil inlet channels 13 can be nineteen, twenty, twenty-four, etc. The embodiment of the present application does not impose any specific limitation on the number of oil injection channels 14. For example, in other possible embodiments, the number of oil injection channels 14 can be nineteen, twenty, twenty-four, etc., and the number of oil injection channels 14 is equal to the number of first oil inlet channels 13.

[0080] Next, the stator core 10 will be explained in detail.

[0081] refer to Figures 3 to 4BThe stator core 10 includes a first core punching group 15, which includes a plurality of first core punchings 151 stacked along the axial direction X. Each first core punching 151 includes a plurality of first oil inlet grooves 1511 spaced apart around the circumferential direction R. The first oil inlet grooves 1511 extend inward from the periphery of the first core punching 151. The first oil inlet grooves 1511 include a first oil inlet port 15111 and a closed end 15112 arranged from the outside to the inside. The cross-sectional area of ​​the first oil inlet port 15111 is smaller than the cross-sectional area of ​​the closed end 15112. Along the axial direction X, the plurality of first oil inlet grooves 1511 of two adjacent first core punchings 151 correspond one to one to form a plurality of first oil inlet channels 13.

[0082] Using the above technical solution, the cross-sectional area of ​​the first oil inlet 15111 is smaller than the cross-sectional area of ​​the closed end 15112. Compared to a design in which the oil inlet size is equal to the closed end size, the distance between two adjacent first oil inlets 15111 in this technical solution is greater than the distance between two adjacent oil inlets in this design. Therefore, in this technical solution, the smaller first oil inlet 15111 can increase the contact area between the stator core 10 and the housing 30, thereby increasing the friction between the stator core 10 and the housing 30. During motor operation, there is no relative slippage between the stator core 10 and the housing 30, resulting in a higher safety factor, thereby better ensuring the motor's torque output and heat dissipation performance.

[0083] In addition, when the slot area of ​​the first oil inlet groove 1511 of the first core punch 151 becomes larger in the axial direction, the magnetic circuit change inside the stator core 10 will be changed. The function of the stator core 10 is to guide and concentrate the magnetic field. The increase in the slot area means that the magnetic resistance of the magnetic circuit has changed. According to Ohm's law of the magnetic circuit, the magnetic flux is equal to the magnetomotive force divided by the magnetomotive force. The increase in the slot area leads to an increase in the magnetomotive force. When the magnetomotive force remains unchanged, the magnetic flux will decrease accordingly, which will have a greater impact on the electromagnetic strength. Therefore, a smaller first oil inlet 15111 can reduce the slot area, correspondingly reduce the impact on the electromagnetic strength, and reduce electromagnetic losses.

[0084] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of first core punches 151 included in the first core punching group 15. For example, in other possible implementations, the number of first core punches 151 included in the first core punching group 15 can be forty, forty-five, fifty, and so on. The embodiment of the present application does not impose any specific limitation on the number of first oil inlet grooves 1511 included in each first core punching 151. For example, in other possible implementations, the number of first oil inlet grooves 1511 included in each first core punching 151 can be nineteen, twenty, twenty-four, and so on. The number of first oil inlet channels 13 is equal to the number of first oil inlet grooves 1511 included in each first core punching 151.

[0085] In some possible implementations, reference Figures 3 to 4B The first oil inlet groove 1511 includes a first part 15113 and a second part 15114. The first part 15113 includes a first oil inlet 15111. The second part 15114 includes a connecting part 151141 connected to the closed end 15112 and the closed end 15112. The connecting part 151141 is a uniform cross-section body, and the cross-sectional area of ​​the first part 15113 gradually increases in the inward direction of the radial direction Y.

[0086] By adopting the above technical solution, the first oil inlet 15111 satisfies that the cooling oil can enter the first oil inlet channel 13 through the first oil inlet 15111 , and the uniform cross-section of the connecting portion 151141 satisfies the flow of the cooling oil in the first oil inlet channel 13 .

[0087] In some possible implementations, reference Figure 1A 、 Figure 1B and Figure 3 The stator core 10 includes a second core punching group 16, and a second core punching group 16 is provided at each end of the first core punching group 15. The second core punching group 16 includes a plurality of oil injection channels 14 arranged around the circumferential direction R. The plurality of oil injection channels 14 and the plurality of first oil inlet channels 13 are respectively offset in the axial direction X.

[0088] Using this technical solution, cooling oil enters the first oil inlet channel 13 through the first oil inlet port 15111 and then flows into the oil injection channel 14. The angle formed by the misalignment of the oil injection channel 14 and the first oil inlet channel 13 in the axial direction X allows the cooling oil to be sprayed from the oil injection channel 14 along the first direction P onto the winding 20, thereby cooling the winding 20.

[0089] Compared to straight, flush channels, the cooling path of the cooling oil within the oil injection channel 14 is effectively increased, thereby increasing the heat exchange time of the cooling oil and improving the cooling effect. Furthermore, if the oil injection channel 14 and the first oil inlet channel 13 are not misaligned in the axial direction X but are directly connected, the cooling oil will be directly ejected in a direction parallel to the axial direction X, which may prevent the cooling oil from reaching the winding 20.

[0090] In some possible implementations, reference Figure 3 、 Figure 4B and Figure 5The second core punching sheet group 16 includes a plurality of second core punching sheets 161 stacked along the axial direction X. Each second core punching sheet 161 includes a plurality of oil injection holes 1611 spaced apart around the circumferential direction R. Along the axial direction X, the plurality of oil injection holes 1611 of two adjacent second core punching sheets 161 correspond one to one to form a plurality of oil injection channels 14. Each oil injection hole 1611 partially overlaps with the second portion 15114 of the corresponding first oil inlet groove 1511.

[0091] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of second core punches 161 included in the second core punching group 16. For example, in other possible implementations, the number of second core punches 161 included in the second core punching group 16 may be forty, forty-five, fifty, and so on. The embodiment of the present application does not impose any specific limitation on the number of oil injection holes 1611 included in each second core punching 161. For example, in other possible implementations, the number of oil injection holes 1611 included in each second core punching 161 may be nineteen, twenty, twenty-four, and so on. The number of oil injection channels 14 is equal to the number of oil injection holes 1611 included in each second core punching 161.

[0092] The present application provides two structures of the stator core 10, wherein the first structure includes a first core punching group 15 and a second core punching group 16, as a first embodiment. The other structure includes a first core punching group 15, a second core punching group 16, and a third core punching group 17, as a second embodiment.

[0093] Example 1

[0094] In some possible implementations, reference Figure 3 and Figure 4A Each first core punching sheet 151 is provided with thirty-two protrusions 1512 spaced apart along the circumferential direction R. The protrusions 1512 are spaced apart from the first oil inlet grooves 1511 and protrude from the first core punching sheet 151. Along the axial direction X, the thirty-two protrusions 1512 of two adjacent first core punching sheets 151 correspondingly form thirty-two convex portions 152.

[0095] refer to Figures 1A to 2 The number of the first core punching sheet group 15 includes multiple numbers. For example, the embodiment 1 includes eleven first core punching sheet groups 15. The eleven first core punching sheet groups 15 are arranged along the axial direction X. Along the radial direction Y, the eleven first core punching sheet groups 15 and the housing 30 define a second oil inlet channel 153 extending along the circumferential direction R. The plurality of protrusions 152 fit the inner wall of the housing 30 to define a plurality of interconnected oil inlet branches 1531 (such as Figure 2As shown by the dashed arrows, the multiple first oil inlet channels 13 are connected to the multiple oil inlet branches 1531.

[0096] By adopting the above technical solution, the second oil inlet channel 153 is divided into a plurality of oil inlet branches 1531 by the plurality of protrusions 152 of the eleven first core punching sheet groups 15. After the cooling oil enters the second oil inlet channel 153 from the second oil inlet port 31, it passes through the plurality of oil inlet branches 1531, and the oil route is converted from one route to multiple routes (such as Figure 2 The cooling oil is continuously in contact with the eleven first core sheet groups 15 to enhance the efficiency of heat conduction, thereby enabling the outer surfaces of the eleven first core sheet groups 15 to form a continuous cooling effect.

[0097] The cooling oil flows through the second oil inlet 31 , multiple oil inlet branches 1531 , multiple first oil inlet channels 13 and multiple oil injection channels 14 in sequence, and is finally sprayed onto the winding 20 to reduce the temperature of the winding 20 .

[0098] In addition, multiple first core punching sheets 151 are welded to form a first core punching sheet group 15, and the protrusions 1512 are spaced apart from the first oil inlet groove 1511 to avoid welding the first oil inlet port 15111 when welding the protrusions 1512, so that the cooling oil cannot enter the first oil inlet channel 13.

[0099] It should be noted that the embodiment of the present application does not impose any specific restrictions on the number of the first core punching groups 15 in Example 1. For example, in other possible implementations, the number of the first core punching groups 15 in Example 1 may be ten, twelve, thirteen, and so on. There is no limitation on the number of first core punchings 151 stacked in each first core punching group 15 in Example 1, and it can be specifically set according to actual conditions. For example, the number of first core punchings 151 stacked in each first core punching group 15 may be the same, which is thirty pieces. Alternatively, the number of first core punchings 151 stacked in each first core punching group 15 may be different. Alternatively, the number of first core punchings 151 stacked in any two first core punching groups 15 may be different, which may be twenty-five pieces and thirty-five pieces respectively.

[0100] In some possible implementations, reference Figure 3 , along the axial direction X, the projections 152 of at least two of the eleven first core punching sheet groups 15 do not overlap.

[0101] By adopting the above-mentioned technical solution, the oil inlet branches 1531 of adjacent first core punching groups 15 can be staggered and connected in the axial direction X, so as to form a plurality of oil inlet branches 1531 spaced apart along the circumferential direction R. However, the first embodiment of the present application does not make any specific arrangement for the structure of the stacked eleven first core punching groups 15, as long as a plurality of oil inlet branches 1531 interconnected with the first oil inlet channel 13 can be formed. For example, it is also possible that along the axial direction X, the projections of the convex portions 152 of each of the eleven first core punching groups 15 overlap with each other. Alternatively, it is also possible that the projections of the convex portions 152 of at least two of the eleven first core punching groups 15 do not overlap, etc.

[0102] In some possible implementations, reference Figure 4A , along the direction of gravity (such as Figure 4A G direction), located on the upper part of the first core punching sheet 151 (as shown in FIG. Figure 4A The number of the first oil inlet grooves 1511 located in the lower portion of the first core punching sheet 151 (such as Figure 4A The number of the first oil inlet grooves 1511 (below the middle dotted line) is shown in FIG.

[0103] For example, refer to Figure 3 and Figure 4A Each first core punching sheet 151 includes nineteen first oil inlet grooves 1511, and along the direction of gravity (such as Figure 4A G direction), located on the upper part of the first core punching sheet 151 (as shown in FIG. Figure 4A The number of the first oil inlet grooves 1511 (above the dotted line) is thirteen, and they are located at the lower part of the first core punching sheet 151 (such as Figure 4A The number of the first oil inlet grooves 1511 (the portion below the middle dotted line) is six.

[0104] By adopting the above technical solution, by arranging more first oil inlet grooves 1511 on the upper part of the first core punching sheet 151, so as to form more first oil inlet channels 13 on the upper part of the first core punching sheet group 15, the cooling area of ​​the cooling oil in the upper part of the stator core 10 in the gravity direction can be increased, thereby improving the cooling efficiency.

[0105] It should be noted that the embodiment of the present application does not impose any specific restrictions on the number of first oil inlet grooves 1511 located at the upper and lower parts of the first core punching sheet 151. For example, in other possible implementations, the number of first oil inlet grooves 1511 located at the upper and lower parts of the first core punching sheet 151 can be twelve and five, fourteen and seven, fifteen and eight, etc., as long as the number of first oil inlet grooves 1511 located at the upper part of the first core punching sheet 151 is greater than the number of first oil inlet grooves 1511 located at the lower part of the first core punching sheet 151.

[0106] In some possible implementations, reference Figure 5 , along the direction of gravity (such as Figure 5 G direction), located on the upper part of the second core punching sheet 161 (as shown in FIG. Figure 5 The number of the oil injection holes 1611 located in the portion above the dotted line is greater than that located in the lower portion of the second core punching sheet 161 (e.g. Figure 5 The number of fuel injection holes 1611 (below the middle dotted line).

[0107] For example, refer to Figure 2 and Figure 5 Each second core punching sheet 161 includes nineteen oil injection holes 1611, and is arranged along the direction of gravity (e.g. Figure 5 G direction), located on the upper part of the second core punching sheet 161 (as shown in FIG. Figure 5 The number of the oil injection holes 1611 (above the dotted line) is thirteen, and they are located at the lower part of the second core punching sheet 161 (such as Figure 5 The number of the oil injection holes 1611 (below the middle dotted line) is six.

[0108] By adopting the above technical solution, by setting more oil injection holes 1611 on the upper part of the second core punching sheet 161, more oil injection channels 14 are formed on the upper part of the second core punching sheet group 16, the cooling area of ​​the cooling oil in the upper part of the stator core 10 in the gravity direction can be increased, thereby improving the cooling efficiency.

[0109] It should be noted that the embodiment of the present application does not impose any specific restrictions on the number of oil injection holes 1611 located respectively at the upper and lower parts of the second core punching sheet 161. For example, in other possible implementations, the number of oil injection holes 1611 located respectively at the upper and lower parts of the second core punching sheet 161 can be twelve and five, fourteen and seven, fifteen and eight, and so on, as long as the number of oil injection holes 1611 located at the upper part of the second core punching sheet 161 is greater than the number of oil injection holes 1611 located at the lower part of the second core punching sheet 161.

[0110] Example 2

[0111] The stator core 10 of the first embodiment and the stator core 10 of the second embodiment share a first oil inlet passage 13 and an oil injection passage 14. Compared to the first embodiment, the stator core 10 of the second embodiment also includes a third core punching group 17. Furthermore, the structures of the first core punchings 151 and the second core punchings 161 of the two embodiments differ. For example, the first core punching 151 of the first embodiment includes multiple tabs 1512, while the first core punching 151 of the second embodiment does not include multiple tabs 1512, but instead includes multiple weld grooves 1513.

[0112] In some possible implementations, reference Figures 6 to 8 Along the axial direction X, two first core punching sheet groups 15 arranged along the axial direction X are respectively provided at both ends of the third core punching sheet group 17. The third core punching sheet group 17, the first core punching sheet groups 15 at both ends, and the housing 30 define a third oil inlet passage 18. The third oil inlet passage 18 extends along the circumferential direction R. The third oil inlet passage 18 is connected to the multiple first oil inlet passages 13, and the third oil inlet passage 18 is connected to the second oil inlet port 31.

[0113] refer to Figures 8 to 11 The third core punching sheet group 17 includes a plurality of third core punching sheets 171 stacked along the axial direction X. The outer diameter d1 of the third core punching sheet 171 is smaller than the outer diameter d2 of the first core punching sheet 151 .

[0114] In the second embodiment of the present application, no specific configuration is made for the structure of the stacked arrangement of the two first core punching groups 15 at both ends of the third core punching group 17, as long as the multiple first oil inlet channels 13 at both ends can be aligned with the third oil inlet channel 18. For example, along the axial direction X, the projections of each first core punching 151 in the two first core punching groups 15 may overlap. Alternatively, the projections of the first core punching 151 in the two first core punching groups 15 may not overlap.

[0115] Using the above technical solution, refer to Figure 6 and Figure 7 The cooling oil flows through the second oil inlet 31 , the third oil inlet channel 18 , the multiple first oil inlet channels 13 and the oil injection channel 14 in sequence, and is finally sprayed onto the winding 20 to reduce the temperature of the winding 20 .

[0116] It should be noted that the embodiment of the present application does not impose any specific restrictions on the number of the first core punching groups 15 in Example 2. For example, in other possible implementations, the number of the first core punching groups 15 in Example 2 may be six, eight, and so on. There is no limitation on the number of first core punchings 151 stacked in each first core punching group 15 in Example 2, and it can be specifically set according to actual conditions. For example, the number of first core punchings 151 stacked in each first core punching group 15 may be the same, which is thirty pieces. Alternatively, the number of first core punchings 151 stacked in each first core punching group 15 may be different. Alternatively, the number of first core punchings 151 stacked in any two first core punching groups 15 may be different, which may be twenty-five pieces and thirty-five pieces respectively.

[0117] In some possible implementations, reference Figure 7 and Figure 9The first core punching sheet 151 also includes sixteen welding grooves 1513 spaced apart around the circumferential direction R. The welding grooves 1513 are spaced apart from the first oil inlet groove 1511. The multiple welding grooves 1513 of two adjacent first core punching sheets 151 correspond one to one to form sixteen weld beads 19.

[0118] It should be noted that the embodiment of the present application does not impose any specific limitation on the number of weld grooves 1513. For example, in other possible implementations, the number of weld grooves 1513 may be fifteen, eighteen, etc. The embodiment of the present application does not impose any specific limitation on the number of weld beads 19. For example, in other possible implementations, the number of weld beads 19 may be fifteen, eighteen, etc., and the number of weld beads 19 corresponds to the number of weld grooves 1513.

[0119] 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 stator core, characterized in that: The stator core comprises: A first core punching group, the first core punching group includes a plurality of first core punchings stacked along the axial direction, each of the first core punchings includes a plurality of first oil inlet grooves arranged at intervals around the circumference, the first oil inlet grooves extend inward from the periphery of the first core punching, the first oil inlet grooves include a first oil inlet port and a closed end arranged from the outside to the inside, the cross-sectional area of ​​the first oil inlet port is smaller than the cross-sectional area of ​​the closed end, and along the axial direction, the plurality of first oil inlet grooves of two adjacent first core punchings correspond one to one to form a plurality of first oil inlet channels.

2. The stator core according to claim 1, characterized in that The first oil inlet groove includes a first part and a second part, the first part includes the first oil inlet, the second part includes a connecting part connected to the closed end and the closed end, the connecting part is a uniform cross-section body, and the cross-sectional size of the first part gradually increases in the radial inward direction.

3. The stator core according to claim 1, characterized in that The stator core includes a second core punching sheet group, and the second core punching sheet group is respectively provided at both ends of the first core punching sheet group. The second core punching sheet group includes a plurality of oil injection channels arranged around the circumference. The plurality of oil injection channels are respectively connected to the plurality of first oil inlet channels in a one-to-one correspondence and are staggered in the axial direction.

4. The stator core according to claim 3, characterized in that The second core punching sheet group includes a plurality of second core punching sheets stacked along the axial direction, and each of the second core punching sheets includes a plurality of oil injection holes arranged at intervals around the circumference. Along the axial direction, the plurality of oil injection holes of two adjacent second core punching sheets correspond one to one to form the plurality of oil injection channels, and each of the oil injection holes partially overlaps with the second part of the corresponding first oil inlet groove.

5. The stator core according to claim 1, characterized in that Each of the first core punching sheets is provided with a plurality of protrusions spaced apart along the circumferential direction, the protrusions are spaced apart from the first oil inlet grooves, and along the axial direction, the plurality of protrusions of two adjacent first core punching sheets correspondingly form a plurality of convex portions; The number of the first core punching sheet groups includes multiple, and the multiple first core punching sheet groups are arranged along the axial direction. In the radial direction, the multiple first core punching sheet groups and the external shell define a second oil inlet channel extending along the circumferential direction, and the multiple protrusions are in contact with the inner wall of the external shell to define a plurality of mutually connected oil inlet branches in the second oil inlet channel, and the multiple first oil inlet channels are connected to the multiple oil inlet branches.

6. The stator core according to claim 5, characterized in that Along the axial direction, projections of the protrusions of at least two of the plurality of first core punching sheet groups do not overlap.

7. The stator core according to claim 1, characterized in that Along the gravity direction, the number of the first oil inlet grooves located at the upper portion of the first core punching sheet is greater than the number of the first oil inlet grooves located at the lower portion of the first core punching sheet.

8. The stator core according to claim 4, characterized in that Along the gravity direction, the number of the oil injection holes located on the upper portion of the second core punching sheet is greater than the number of the oil injection holes located on the lower portion of the second core punching sheet.

9. The stator core according to claim 3, characterized in that The stator core further includes a third core punching sheet group. Along the axial direction, both ends of the third core punching sheet group are respectively provided with the first core punching sheet group; wherein, The third core punching sheet group, the first core punching sheet groups at both ends, and the outer shell together define a third oil inlet channel, the third oil inlet channel extending along the circumferential direction, and the third oil inlet channel communicating with the plurality of first oil inlet channels; The third core punching sheet group includes a plurality of third core punching sheets stacked along the axial direction. The outer diameter of the third core punching sheets is smaller than the outer diameter of the first core punching sheets.

10. The stator core according to claim 9, characterized in that The first core punching sheet further includes a plurality of welding grooves spaced apart around the circumference, the welding grooves being spaced apart from the first oil inlet grooves, and the plurality of welding grooves of two adjacent first core punching sheets corresponding to each other form a plurality of weld beads.

11. A motor, characterized in that: The motor comprises: The stator core according to any one of claims 1 to 10; a winding connected to the slot portion of the stator core; The stator core is arranged in the housing, the housing is connected to the stator core, and the housing includes a second oil inlet, which is communicated with the first oil inlet channel.

12. The motor according to claim 11, wherein The second oil inlet is connected to a plurality of oil inlet branches formed by the stator core, and external cooling oil flows through the second oil inlet, the plurality of oil inlet branches, the first oil inlet channel and the oil injection channel in sequence.

13. The motor according to claim 11, wherein The second oil inlet is communicated with the third oil inlet channel formed by the stator core, and external cooling oil flows through the second oil inlet, the third oil inlet channel, the first oil inlet channel and the oil injection channel in sequence.

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