Stator core and motor

Abstract

The stator core comprises a first stator punching sheet and a second stator punching sheet, when the first stator punching sheet and the second stator punching sheet are stacked to form a stacked body, each wire slot on the stacked body is communicated with at least one oil inlet groove and forms an oil distribution groove which is communicated along the circumferential direction, and the oil distribution groove is communicated with the oil inlet groove; the end part sealing element is arranged at the end part of the stator iron core and is partially positioned in the wire slot of the stator iron core; and the notch sealing element is arranged in a wire slot in the stator iron core, and an oil spraying opening is formed between the end part of the notch sealing element and the end part sealing element. Cooling oil flows into the wire grooves through the oil distribution grooves which are communicated in the circumferential direction and the oil inlet grooves, and the winding is immersed in the grooves in cooperation with the notch sealing pieces, so that the winding can be directly cooled in the grooves, the cooling effect is better, and the service life of the winding is prolonged. And meanwhile, through the oil spraying opening formed by the notch sealing piece and the end sealing piece, cooling oil can be sprayed to the end winding from the interior of the wire groove through the oil spraying opening, so that spraying cooling of the end winding is achieved.

Description

Technical Field

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

[0002] With the emergence and continuous development of high-power density motors in new energy vehicles, how to improve and enhance motor heat dissipation has received more and more attention. At present, motor cooling methods mostly use air cooling, water cooling and oil cooling. Compared with air cooling and water cooling, oil has strong thermal conductivity, and the contact and heat exchange of oil with the main heating area are more direct and efficient. Therefore, oil cooling has gradually become the mainstream trend of drive motor heat dissipation.

[0003] One of the main heat sources for the stator is the winding, and the temperature in the stator slot is the highest during actual operation. The current mainstream method for cooling the winding is to spray the winding by arranging an oil spray pipe, but it takes up a large space and the cooling uniformity is not ideal; there is also a method of cooling the winding by opening an oil groove axially in the yoke of the stator core and arranging oil rings with holes at the upper and lower ends, and a method of opening an oil channel in the middle of the motor stator core, axially setting an oil groove that passes through the winding, and spraying the winding from bottom to top. However, the above scheme not only has a complex assembly process but also makes it difficult to achieve the purpose of cooling the highest temperature of the stator. Utility Model Content

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a stator core and a motor to improve the problem that the existing motor cannot effectively dissipate heat for the windings in the slots of the stator core.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a stator core, comprising:

[0006] A first stator punching sheet and a second stator punching sheet, when the first stator punching sheet and the second stator punching sheet are stacked to form a stack, each wire slot on the stack is connected to at least one oil inlet groove, and an oil distribution groove connected in a circumferential direction is formed, and the oil distribution groove is connected to the oil inlet groove;

[0007] An end seal, which is arranged at the end of the stator core and is partially located in the wire slot of the stator core;

[0008] The slot seal is arranged in the wire slot in the stator core and seals the slot position of the wire slot. An oil injection port is formed between one end of the slot seal and the end seal, and the oil injection port points to the end winding of the stator core.

[0009] In one embodiment of the utility model, the first stator punching sheet and the second stator punching sheet have a plurality of wire slots distributed along their circumferential directions, wherein the M wire slots after each N wire slots are connected to the oil inlet groove, respectively. When the first stator punching sheet and the second stator punching sheet are stacked, the wire slots not connected to the oil inlet groove and the wire slots connected to the oil inlet groove in the first stator punching sheet overlap with the wire slots connected to the oil inlet groove and the wire slots not connected to the oil inlet groove in the second stator punching sheet, respectively.

[0010] In one embodiment of the utility model, the yokes of the first stator punching sheet and the second stator punching sheet are provided with a plurality of the oil distribution grooves, the plurality of the oil distribution grooves are distributed along the circumference thereof, and each of the oil distribution grooves is connected to at least one of the oil inlet grooves.

[0011] In one embodiment of the utility model, the yokes of the first stator punching sheet and the second stator punching sheet are provided with a plurality of the oil distribution grooves. When the first stator punching sheet and the second stator punching sheet are stacked, one end of the oil inlet groove on one stator punching sheet is connected to the oil distribution groove on another stator punching sheet, and each of the oil distribution grooves is connected to at least one of the oil inlet grooves.

[0012] In one embodiment of the present invention, when the first stator punching sheet and the second stator punching sheet are stacked, the two ends of the oil distribution groove on the first stator punching sheet are respectively connected to the two adjacent oil distribution grooves on the second stator punching sheet to form a circumferentially penetrating oil distribution oil path.

[0013] In one embodiment of the utility model, at least one of the first stator punching sheet and the second stator punching sheet is provided with an oil inlet, and the oil inlet is distributed on the outer circumferential surface of the first stator punching sheet and / or the second stator punching sheet, and the oil inlet is connected to the oil distribution groove.

[0014] In one embodiment of the utility model, a protrusion structure with a through hole is respectively provided on the outer circumference of the first stator punching sheet and the second stator punching sheet. When the first stator punching sheet and the second stator punching sheet are stacked, the protrusion structures thereon overlap to form an oil inlet cavity extending in the axial direction, and the oil inlet port is connected to the oil inlet cavity.

[0015] In one embodiment of the present invention, a plurality of the oil inlets are distributed along the circumference of the first stator punching sheet and the second stator punching sheet.

[0016] In one embodiment of the utility model, each wire slot on the first stator punching sheet is connected to an oil inlet groove, the diameter of the second stator punching sheet is smaller than the diameter of the first stator punching sheet, a plurality of the second stator punching sheets are stacked to form a stacking body, the first stator punching sheets are stacked on both sides of the stacking body, the oil distribution groove is formed between the first stator punching sheets on both sides of the stacking body, and the oil inlet groove is connected to the oil distribution groove.

[0017] In one embodiment of the utility model, the end seal includes a body, a sealing buckle and an oil drain chamber, the body is located at the end of the stator core, the sealing buckle is formed on the bottom surface of the body and is engaged in the wire groove at the end of the stator core, and the oil drain chamber is formed in the body and is connected to the wire groove.

[0018] In one embodiment of the utility model, the sealing buckle is located in the wire slot and fixed between the slot wall of the wire slot and the winding in the slot to fix the winding in the slot and to leave a gap between the winding in the slot and the slot wall of the wire slot.

[0019] In one embodiment of the utility model, a slope is formed on one side of the end of the slot seal close to the outer side of the stator core, and the slope is at least partially located in the oil drain cavity and forms an oil injection port with the end seal.

[0020] In one embodiment of the utility model, the end seal includes a plurality of sub-seals, each of the sub-seals includes at least one of the main bodies, at least one of the sealing buckles and at least one of the oil drain chambers, and the main bodies, the sealing buckles and the oil drain chambers correspond one to one.

[0021] In an embodiment of the present invention, the plurality of sub-seals are independent of each other or at least some of the sub-seals are integrally formed structures.

[0022] The utility model further provides a motor, comprising: a rotor and a stator, wherein the stator is coaxially arranged around the outer circumference of the rotor, and the stator comprises a stator core as described in any one of the above embodiments.

[0023] The utility model provides a stator core and a motor. Part of the stator punching sheets in the stator core are stator punching sheets provided with a plurality of oil inlet grooves, each of which is connected to a wire slot. When stacked to form a stack, each wire slot on the stack is connected to at least one oil inlet groove, and the oil inlet groove is also connected to an oil distribution groove. The oil distribution grooves are connected along the circumference of the stator core, so that cooling oil flows to different oil inlet grooves through the circumferentially connected oil distribution grooves, and cooperates with a slot seal to immerse the winding in the slot, so that the winding can be directly cooled in the slot, and the cooling effect is better. At the same time, the oil spray port formed by the slot seal and the end seal can spray the cooling oil from the wire slot through the oil spray port to the end winding, so as to realize spray cooling of the end winding.

[0024] The utility model provides a stator core and a motor. By arranging part of the stator punching sheets in the stator core as punching sheets with oil distribution grooves and oil inlet grooves, the number of punching sheets slotted in the electromagnetic influence zone is very small, which has basically no effect on the electromagnetic performance. The structure is simple and easy to process.

[0025] The utility model provides a stator core and a motor. The oil cooling for realizing slot cooling in the stator core can be applicable to welded cores, cores with other connection methods such as buckle points and bonding, and can achieve the same heat dissipation effect; it is also applicable to electromagnetic schemes with different pole slot combinations; and the cooling oil entering the slot can be sprayed from the end of the core, so as to achieve the effect of spraying the winding when used with the core in different axial cooling.

[0026] The utility model provides a stator core and a motor, which are engaged in a wire slot through an end seal to fix the winding in the slot in a circumferential direction, so that there is no contact between the winding in the slot and the wire slot wall, so that the wire slot wall and the slot seal form a cooling medium flow cavity with a larger space, so as to improve the fluidity of the cooling medium in the slot and the heat dissipation effect on the winding in the slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The figure is a schematic structural diagram of a stator core in one embodiment of the utility model.

[0029] Figure 2 This is a schematic structural diagram of the first stator punching sheet in the first embodiment of the present invention.

[0030] Figure 3It is a schematic structural diagram of the second stator punching sheet in the first embodiment of the utility model.

[0031] Figure 4 This is a schematic diagram of the oil circuit in the first embodiment of the present utility model.

[0032] Figure 5 This is a schematic diagram of the structure of the first stator punching sheet in the second embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the structure of the second stator punching sheet in the second embodiment of the present utility model.

[0034] Figure 7 This is a schematic structural diagram of the first stator punching sheet in the third embodiment of the present invention.

[0035] Figure 8 This is a schematic diagram of the structure of the second stator punching sheet in the third embodiment of the present invention.

[0036] Fig. 9 It is a schematic structural diagram of a stator core in another embodiment of the utility model.

[0037] Fig.10 This is a schematic structural diagram of the first stator punching sheet in the fourth embodiment of the present utility model.

[0038] Fig.11 This is a schematic diagram of the structure of the second stator punching sheet in the fourth embodiment of the present utility model.

[0039] Fig.12 The figure is a schematic diagram of the cooperation between the end seal and the notch seal in one embodiment of the utility model.

[0040] Fig.13 It is a schematic diagram of the cooperation of the end seal in one embodiment of the utility model.

[0041] Fig.14 The figure is a schematic structural diagram of an end seal in one embodiment of the utility model.

[0042] Fig.15 The figure is a schematic structural diagram of a sub-seal in one embodiment of the utility model.

[0043] Fig.16 The figure is a schematic diagram of the matching of the notch seal in one embodiment of the utility model.

[0044] Fig.17 The figure is a schematic structural diagram of a notch seal in one embodiment of the utility model.

[0045] Description of labels:

[0046] 100, stator core; 101, oil inlet groove; 102, wire groove; 103, oil distribution groove; 104, oil inlet; 11, first stator punching sheet; 12, second stator punching sheet; 105, through hole; 106, raised structure; 107, oil inlet chamber; 10, first stacking body; 20, end seal; 21, main body; 22, sealing buckle; 23, oil drain chamber; 201, sub-seal; 30, slot seal; 301, oil injection port; 302, inclined surface. DETAILED DESCRIPTION

[0047] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0048] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0049] The utility model provides a stator core and a motor to improve the problem that the existing motor cannot effectively dissipate heat for the winding in the slot of the stator core. Specifically, the stator core 100 can form an oil passage that can enter the wire slot by arranging special punching sheets, so that cooling oil can enter the slot to achieve direct cooling of the winding in the slot.

[0050] See also Figures 1 to 17As shown, in this embodiment, the stator core 100 includes a plurality of stator punching sheets stacked together, wherein at least a portion of the plurality of stator punching sheets are provided with a plurality of oil inlet grooves 101 distributed along the circumferential direction thereof, and each oil inlet groove 101 is connected to a line groove 102, and when a plurality of stator punching sheets provided with the oil inlet grooves 101 are stacked to form a stack, each of the line grooves 102 on the stack is connected to at least one of the oil inlet grooves 101, and one end of the oil inlet groove 101 is connected to the line groove 102, and the other end is connected to the oil distribution groove 103. The oil distribution groove 103 is connected along the circumference of the stator core 100, and an oil inlet 104 is arranged on the outer circumference of the stator punching sheet having the oil inlet groove 101 respectively. The oil inlet is connected with the oil distribution groove 103. The cooling oil enters the oil distribution groove 103 from the oil inlet 104, and then flows into each oil inlet groove 101 through the circumferentially connected oil distribution groove 103, and then flows into each wire slot 102 of the stator core 100, so as to directly cool the winding in the slot, thereby improving its cooling effect, and at the same time, it can cooperate with the slot seal to realize oil immersion cooling in the slot.

[0051] See also Figures 1 to 8 As shown, in a specific embodiment, a stator sheet having a plurality of oil inlet grooves 101 distributed along the circumferential direction includes a first stator sheet 11 and a second stator sheet 12, wherein the first stator sheet 11 and the second stator sheet 12 are respectively distributed with a plurality of line slots 102 along the circumferential direction thereof, wherein the M line slots 102 after each interval of N line slots 102 are respectively connected to the oil inlet groove 101, and when the first stator sheet 11 and the second stator sheet 12 are stacked, the first stator sheet 11 has a plurality of line slots 102 distributed along the circumferential direction thereof. The wire slots 102 not connected to the oil inlet groove 101 and the wire slots 102 connected to the oil inlet groove 101 overlap with the wire slots 102 connected to the oil inlet groove 101 and the wire slots 102 not connected to the oil inlet groove 101 in the second stator punching sheet 12 respectively, thereby ensuring that when the stacking body is formed, each of the wire slots 102 on the stacking body is connected to at least one of the oil inlet grooves 101, thereby ensuring that cooling oil can flow into each of the wire slots 102 of the stator core 100 to achieve direct cooling.

[0052] Specifically, the line slots 102 on the first stator punching sheet 11 and the second stator punching sheet 12 are defined as the first line slot, the second line slot, ..., the Xth line slot in a clockwise direction, where X is 48, that is, the first stator punching sheet 11 and the second stator punching sheet 12 have 48 line slots 102, and the following is described as an example:

[0053] For example, see Figures 1 to 8As shown, the two line slots 102 on both sides of each interval of a line slot 102 are respectively connected to the oil inlet slot 101. For example, the line slots 102 numbered as odd or even numbers on the stator punching sheet are connected to the oil inlet slot 101. At this time, the first line slot, the third line slot, the fifth line slot, ... the Yth line slot on one of the first stator punching sheet 11 and the second stator punching sheet 12 are respectively connected to the oil inlet slot 101, wherein Y is an odd number, and the second line slot, the fourth line slot, the sixth line slot, ... the Zth line slot on the other of the first stator punching sheet 11 and the second stator punching sheet 12 are respectively connected to the oil inlet slot 101, wherein Z is an even number, one of Y and Z is equal to X, and the other is equal to X-1. When the first stator punching sheet 11 and the second stator punching sheet 12 are stacked, the line slots 102 with the same number in the first stator punching sheet 11 and the second stator punching sheet 12 overlap, so that each of the line slots 102 on the stack is connected to at least one of the oil inlet slots 101.

[0054] For example, the two line slots 102 after every two line slots 102 are respectively connected to the oil inlet groove 101. At this time, the first line slot, the second line slot, the fifth line slot, the sixth line slot, ..., the A-1th line slot, and the Ath line slot on one of the first stator punching sheet 11 and the second stator punching sheet 12 are respectively connected to the oil inlet groove 101, and the third line slot, the fourth line slot, the seventh line slot, the eighth line slot, ..., the B-1th line slot, and the Bth line slot on the other of the first stator punching sheet 11 and the second stator punching sheet 12 are respectively connected to the oil inlet groove 101. One of A and B is equal to X, and the other is equal to X-2. When the first stator punching sheet 11 and the second stator punching sheet 12 are stacked, the line slots 102 with the same number in the first stator punching sheet 11 and the second stator punching sheet 12 overlap, so that each of the line slots 102 on the stack is connected to at least one of the oil inlet grooves 101.

[0055] Of course, it can be understood that the M line slots 102 after each N line slots 102 on different punching sheets are respectively connected to the oil inlet grooves 101, and the N and M are the same. The M line slots 102 after each N line slots 102 on the same punching sheet are respectively connected to the oil inlet grooves 101, and the N and M can be the same or different, thereby ensuring that when the stacked body is formed, each of the line slots 102 on the stacked body is connected to at least one of the oil inlet grooves 101, thereby ensuring that cooling oil can flow into each line slot 102 of the stator core 100 to achieve direct cooling.

[0056] See also Figure 2 and Figure 3As shown, in the first embodiment, a plurality of oil distribution grooves 103 are provided on the yoke of the first stator punching sheet 11 and the second stator punching sheet 12, and the plurality of oil distribution grooves 103 are distributed along the circumference of the stator punching sheet, and each of the oil distribution grooves 103 is connected to at least one of the oil inlet grooves 101, and the cooling oil flows into each of the oil inlet grooves 101 connected thereto through the oil distribution grooves 103, and then flows into the line grooves 101, realizing direct cooling in the grooves. It can be understood that at this time, the oil inlet oil 101 and the oil distribution groove 103 connected thereto are located on the same stator punching sheet.

[0057] In the above embodiment, the example in which each line slot 102 after each line slot 102 is connected to the oil inlet slot 101 is used for explanation: wherein each of the oil inlet slots 101 is connected to an oil distribution slot 103, the oil distribution slot 103 connected to the first line slot on the first stator punching sheet 11 is defined as the first oil distribution slot, and the two oil distribution slots 103 adjacent to the first oil distribution slot on the second stator punching sheet are defined as the second oil distribution slot and the third oil distribution slot. At this time, the second oil distribution slot and the third oil distribution slot are the second stator punching sheet, respectively. The oil distribution groove on the punching sheet 12 is connected with the Zth line groove and the second line groove, and the two ends of the first oil distribution groove overlap with the second oil distribution groove and the third oil distribution groove adjacent thereto to achieve connection, so that the cooling oil can flow circumferentially. It can be understood that the other oil distribution grooves 103 on the first stator punching sheet 11 and the second stator punching sheet 12 are also connected in the same way to form a circumferential oil circuit, so that the cooling oil can flow into each oil inlet groove 101 through the circumferentially connected oil distribution grooves 103, and then enter the line groove 102.

[0058] See also Figure 5 and Figure 6 As shown, in the second embodiment, the yoke of the first stator punching sheet 11 and the second stator punching sheet 12 is provided with a plurality of the oil distribution grooves 103. When the first stator punching sheet 11 and the second stator punching sheet 12 are stacked, one end of the oil inlet groove 101 on one stator punching sheet is connected with the oil distribution groove 103 on another stator punching sheet, and each of the oil distribution grooves 103 is connected with at least one of the oil inlet grooves 101. The cooling oil flows into each of the oil inlet grooves 101 connected thereto through the oil distribution grooves 103, and then flows into the line slots 101, realizing direct cooling in the slots. It can be understood that at this time, the oil distribution grooves 103 connected thereto by the inlet oil 101 are located on different stator punching sheets.

[0059] Take the above embodiment in which each line slot 102 after each line slot 102 is connected to the oil inlet groove 101 as an example for explanation: wherein the oil distribution groove 103 on the same stator punch is arranged between two adjacent oil inlet grooves 101, the oil distribution groove 103 between the Z line slot and the second line slot on the first stator punch 11 is defined as the first oil distribution groove, the oil distribution groove between the Z-1 line slot and the first line slot on the second stator punch is defined as the second oil distribution groove, and the oil distribution groove between the first line slot and the third line slot on the second stator punch is defined as the third oil distribution groove. The two ends of the first oil distribution groove overlap with the second oil distribution groove and the third oil distribution groove adjacent thereto to achieve communication, so that the cooling oil can flow in the circumferential direction. At the same time, the oil inlet groove 101 on the second stator punching sheet 12 that is connected to the first line groove is connected to the first oil distribution groove on the first stator punching sheet 11, the oil inlet groove 103 on the first stator punching sheet 11 that is connected to the Zth line groove is connected to the second oil distribution groove on the second stator punching sheet 12, and the oil inlet groove 103 on the first stator punching sheet 11 that is connected to the second line groove is connected to the third oil distribution groove on the second stator punching sheet 12. It can be understood that the other oil distribution grooves 103 on the first stator punching sheet 11 and the second stator punching sheet 12 are also connected in the same way, so as to form a circumferential oil path, so that the cooling oil can flow into each oil inlet groove 101 through the circumferentially connected oil distribution grooves 103, and then enter the line groove 102.

[0060] It can be understood that, in this embodiment, when the first stator punching sheet 11 and the second stator punching sheet 12 are stacked, the two ends of the oil distribution groove 103 on the first stator punching sheet 11 are respectively connected to the two adjacent oil distribution grooves 103 on the second stator punching sheet 12 to form a circumferentially penetrating oil distribution oil path.

[0061] In this embodiment, each of the oil distribution grooves 103 is connected to at least one of the oil inlet grooves 101. For example, when N and M described in the above embodiment are equal to 1, each of the oil distribution grooves 103 is connected to one of the oil inlet grooves 101. When N and M described in the above embodiment are greater than 1, each of the oil distribution grooves 103 can be connected to two or other numbers of the oil inlet grooves 101.

[0062] See also Figures 1 to 8As shown, in this embodiment, at least one of the first stator punching sheet 11 and the second stator punching sheet 12 is provided with the oil inlet 104, and the oil inlet 104 is distributed on the outer circumferential surface of the first stator punching sheet 11 and / or the second stator punching sheet 12, and the oil inlet 104 is connected with the oil distribution groove 103. For example, in this embodiment, the oil inlet 104 is provided on the outer circumferential surface of the first stator punching sheet 11, and is connected with the oil distribution groove 103 on the first stator punching sheet 11, and the cooling oil enters the oil distribution groove 103 from the oil inlet 104, and then flows into each oil inlet groove 101 through the circumferentially connected oil distribution groove 103, and then flows into each wire slot 102 of the stator core 100, so as to directly cool the winding in the slot, thereby improving its cooling effect.

[0063] See also Figure 7 and Figure 8 As shown, in embodiment 4, a protrusion structure 106 with a through hole 105 is respectively provided on the outer circumference of the first stator punching sheet 11 and the second stator punching sheet 12. When the first stator punching sheet 11 and the second stator punching sheet 12 are stacked, the protrusion structures 106 thereon overlap, so that the through holes thereon form an oil inlet cavity 107 extending axially, and the oil inlet port 104 is connected to the oil inlet cavity 107, and the oil inlet port 104 can be provided on the first stator punching sheet 11 and / or the second stator punching sheet 12. The cooling oil enters the oil distribution groove 103 from the oil inlet cavity 107 through the oil inlet port 104, and then flows to each oil inlet groove 101 through the circumferentially connected oil distribution grooves 103, and then flows into each wire slot 102 of the stator core 100, so as to directly cool the winding in the slot, thereby improving its cooling effect.

[0064] It can be understood that there are multiple oil inlets 104 distributed along the circumference of the outer circumference of the first stator punching sheet 11 and the second stator punching sheet 12. For example, the multiple oil inlets 104 can be evenly distributed to ensure that the cooling oil can evenly enter each wire slot 102 to ensure its heat dissipation effect. The number of oil inlets 104 can be set as needed to achieve better cooling effect.

[0065] It can be understood that by setting some stator punching sheets in the stator core as punching sheets with oil distribution grooves 103 and oil inlet grooves 101, the number of punching sheets slotted in the electromagnetic influence zone is very small, which has basically no effect on the electromagnetic performance, and its structure is simple and easy to process.

[0066] See also Figures 9 to 11As shown, in the fourth embodiment, each wire slot 102 on the first stator punching sheet 11 is connected to the oil inlet groove 101, and the diameter of the second stator punching sheet 12 is smaller than the diameter of the first stator punching sheet 11. When the first stator punching sheet 13 and the second stator punching sheet 14 are stacked to form a stack, a plurality of the second stator punching sheets 14 are stacked to form a sub-stack, and the first stator punching sheets 13 are stacked on both sides of the sub-stack. Since the diameter of the first stator punching sheet 13 is larger than the diameter of the second stator punching sheet 14, when the plurality of the second stator punching sheets 14 are stacked to form a stack, the first stator punching sheets 13 are stacked on both sides of the sub-stack. An annular groove is formed between the first stator punches 13 on both sides of the sub-stack body formed by stacking the stator punches 14. The annular groove is the oil distribution groove 103. Since the diameter of the first stator punch 13 is greater than the diameter of the second stator punch 14, the oil inlet groove 101 on the first stator punch 13 can be partially exposed in the oil distribution groove 103, so that the oil inlet groove 101 is connected with the oil distribution groove 103. At this time, the oil inlet 104 is an annular opening formed along its circumference, and the oil inlet 104 forms an integral structure with the oil distribution groove 103.

[0067] It can be understood that some of the stator punching sheets in the stator core are set as punching sheets with oil inlet grooves and some punching sheets with only appropriately reduced diameters. The number of punching sheets with slots in the electromagnetic influence zone is very small, and there is basically no effect on the electromagnetic performance. Its structure is simple and easy to process, so that the core stamping die can be integrated in a progressive die to reduce costs and improve production efficiency.

[0068] It should be noted that, in this embodiment, the stator core may include a plurality of stacked bodies formed by stacking different stator punching sheets, wherein some of the stacked bodies include a first stacked body 10 formed by stacking the first stator punching sheets 11 and the second stator punching sheets 12 .

[0069] See also Figures 12 to 17 As shown, in this embodiment, the stator core 100 further includes an end seal 20 and a slot seal 30. The end seal 20 is disposed at the end of the stator core 100 and is partially located in the wire slot 102. The slot seal 30 is disposed in the wire slot 102 of the stator core 100 and seals the slot position of the wire slot 102. An oil spray port 301 is formed between one end of the slot seal 30 and the end seal 20. The oil spray port 301 points to the end winding of the stator core 100, thereby achieving spray heat dissipation of the end winding.

[0070] See also Figures 12 to 15As shown, in this embodiment, the slot seal 20 includes a body 21, a sealing buckle 22 and an oil drain cavity 23, the body 21 is located at the end of the stator core 100, the sealing buckle 22 is formed on the bottom surface of the body 21 and is engaged in the wire slot 102 of the stator core, and the oil drain cavity 23 is formed with the body 21 and communicates with the wire slot 102 to accommodate the cooling oil in the wire slot 102. It can be understood that the end seal 20 can be used as a forming tool for winding turns, thereby reducing the cost of the forming tool.

[0071] See also Figures 12 to 15 As shown, in this embodiment, the sealing buckle 22 is located in the wire slot 102 and fixed between the slot wall of the wire slot 102 and the winding in the slot, so as to fix the winding in the slot and allow a gap to exist between the winding in the slot and the slot wall of the wire slot 102, that is, to play a role of circumferentially fixing the winding in the slot, so that there is no contact between the winding in the slot and the slot wall of the wire slot, so that the slot wall of the wire slot and the slot seal 30 form a cooling medium flow cavity with a larger space, so as to improve the fluidity of the cooling medium in the slot and the heat dissipation effect on the winding in the slot.

[0072] It can be understood that the end seal 20 includes a plurality of sub-seals 201, each of which includes at least one body 21, at least one sealing buckle 22 and at least one oil drain cavity 23, and the body 21, the sealing buckle 22 and the oil drain cavity 23 correspond to each other, and the plurality of sub-seals 201 are independent of each other or at least some of the sub-seals 201 are integrally formed. In this embodiment, the end seal 20 can be injection molded or molded insulating paper, which has a simple structure and is easy to process and produce.

[0073] See also Fig.12 , Fig.16 and Fig.17 As shown, in this embodiment, the end of the slot seal 30 is close to the side of the outer side of the stator core 100 and is formed with an inclined surface 302. The inclined surface 301 is at least partially located in the oil drain cavity 23, and forms an oil injection port 301 with the end seal 20. The cooling oil flows to different oil inlet grooves 101 through the circumferentially connected oil distribution grooves 103, and cooperates with the slot seal 30 to immerse the winding in the groove, so that the winding can be directly cooled in the groove, and the cooling effect is better. At the same time, the oil injection port 301 formed by the slot seal 30 and the end seal 20 can make the cooling oil spray from the wire slot 102 through the oil injection port 301 to the end winding, so as to achieve spray cooling of the end winding. In this embodiment, the slot seal 30 can be sealed with a variety of materials, for example, it can be set as an insulating paper, injection molded parts and other structures.

[0074] Of course, the stator core in the present application is not limited to welded cores, but can also cover cores with other connection methods such as buckling points, bonding, bolt connection, interference connection, etc., and can achieve the same heat dissipation effect. It is also suitable for electromagnetic schemes with different pole slot combinations, and the cooling oil entering the slot can be sprayed from the end of the core, so that the core can be used with different axial cooling methods to achieve the effect of spraying the winding.

[0075] See also Figures 1 to 17 As shown, the utility model further proposes a motor, the motor comprising a rotor (not shown) and a stator, the stator ring is arranged on the outer circumference of the rotor, and the stator and the rotor are arranged coaxially, and the stator comprises a stator core 100 as described in the above embodiment. It should be noted that the structure of the stator core is similar or identical to that of the stator core 100 described in the above embodiment, and in order to avoid repetition, it will not be repeated here.

[0076] The utility model provides a stator core and a motor. Part of the stator punching sheets in the stator core are stator punching sheets provided with a plurality of oil inlet grooves, each of which is connected to a wire slot. When stacked to form a stack, each wire slot on the stack is connected to at least one oil inlet groove, and the oil inlet groove is also connected to an oil distribution groove. The oil distribution grooves are connected along the circumference of the stator core, so that cooling oil flows to different oil inlet grooves through the circumferentially connected oil distribution grooves, and cooperates with a slot seal to immerse the winding in the slot, so that the winding can be directly cooled in the slot, and the cooling effect is better. At the same time, the oil spray port formed by the slot seal and the end seal can spray the cooling oil from the wire slot through the oil spray port to the end winding, so as to realize spray cooling of the end winding.

[0077] The utility model provides a stator core and a motor. By arranging part of the stator punching sheets in the stator core as punching sheets with oil distribution grooves and oil inlet grooves, the number of punching sheets slotted in the electromagnetic influence zone is very small, which has basically no effect on the electromagnetic performance. The structure is simple and easy to process.

[0078] The utility model provides a stator core and a motor. The oil cooling for realizing slot cooling in the stator core can be applicable to welded cores, cores with other connection methods such as buckle points and bonding, and can achieve the same heat dissipation effect; it is also applicable to electromagnetic schemes with different pole slot combinations; and the cooling oil entering the slot can be sprayed from the end of the core, so as to achieve the effect of spraying the winding when used with the core in different axial cooling.

[0079] The utility model provides a stator core and a motor, which are engaged in a wire slot through an end seal to fix the winding in the slot in a circumferential direction, so that there is no contact between the winding in the slot and the wire slot wall, so that the wire slot wall and the slot seal form a cooling medium flow cavity with a larger space, so as to improve the fluidity of the cooling medium in the slot and the heat dissipation effect on the winding in the slot.

[0080] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

[0081] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present utility model, the remaining technical features will not be described here in detail.

Claims

1. A stator core, characterized in that: include: A first stator punching sheet and a second stator punching sheet, when the first stator punching sheet and the second stator punching sheet are stacked to form a stack, each wire slot on the stack is connected to at least one oil inlet groove, and an oil distribution groove connected in a circumferential direction is formed, and the oil distribution groove is connected to the oil inlet groove; An end seal, which is arranged at the end of the stator core and is partially located in the wire slot of the stator core; The slot seal is arranged in the wire slot in the stator core and seals the slot position of the wire slot. An oil injection port is formed between one end of the slot seal and the end seal, and the oil injection port points to the end winding of the stator core.

2. The stator core according to claim 1, characterized in that: The first stator punching sheet and the second stator punching sheet have a plurality of wire slots distributed along their circumferential directions, wherein the M wire slots after each N wire slots are connected to the oil inlet groove, respectively. When the first stator punching sheet and the second stator punching sheet are stacked, the wire slots not connected to the oil inlet groove and the wire slots connected to the oil inlet groove in the first stator punching sheet overlap with the wire slots connected to the oil inlet groove and the wire slots not connected to the oil inlet groove in the second stator punching sheet, respectively.

3. The stator core according to claim 2, characterized in that: The yokes of the first stator punching sheet and the second stator punching sheet are provided with a plurality of the oil distribution grooves, the plurality of the oil distribution grooves are distributed along the circumference thereof, and each of the oil distribution grooves is connected to at least one of the oil inlet grooves.

4. The stator core according to claim 2, characterized in that: The yokes of the first stator punching sheet and the second stator punching sheet are provided with a plurality of the oil distribution grooves. When the first stator punching sheet and the second stator punching sheet are stacked, one end of the oil inlet groove on one stator punching sheet is connected with the oil distribution groove on another stator punching sheet, and each of the oil distribution grooves is connected with at least one of the oil inlet grooves.

5. The stator core according to claim 3 or 4, characterized in that: When the first stator punching sheet and the second stator punching sheet are stacked, two ends of the oil distribution groove on the first stator punching sheet are respectively connected with two adjacent oil distribution grooves on the second stator punching sheet to form a circumferentially penetrating oil distribution oil path.

6. The stator core according to claim 2, characterized in that: At least one of the first stator punching sheet and the second stator punching sheet is provided with an oil inlet, and the oil inlet is distributed on the outer circumferential surface of the first stator punching sheet and / or the second stator punching sheet, and the oil inlet is communicated with the oil distribution groove.

7. The stator core according to claim 6, characterized in that: A protrusion structure with a through hole is respectively arranged on the outer circumference of the first stator punching sheet and the second stator punching sheet. When the first stator punching sheet and the second stator punching sheet are stacked, the protrusion structures thereon overlap to form an oil inlet cavity extending in the axial direction, and the oil inlet port is connected to the oil inlet cavity.

8. The stator core according to claim 6 or 7, characterized in that: A plurality of the oil inlets are distributed along the circumferential direction of the first stator punching sheet and the second stator punching sheet.

9. The stator core according to claim 1, characterized in that: Each wire slot on the first stator punching sheet is connected to an oil inlet groove, the diameter of the second stator punching sheet is smaller than the diameter of the first stator punching sheet, a plurality of the second stator punching sheets are stacked to form a stacking body, the first stator punching sheets are stacked on both sides of the stacking body, the oil distribution groove is formed between the first stator punching sheets on both sides of the stacking body, and the oil inlet groove is connected to the oil distribution groove.

10. The stator core according to claim 1, characterized in that: The end seal includes a body, a sealing buckle and an oil drain cavity. The body is located at the end of the stator core. The sealing buckle is formed on the bottom surface of the body and is engaged in the wire slot of the stator core. The oil drain cavity is formed in the body and is connected to the wire slot.

11. The stator core according to claim 10, characterized in that: The sealing buckle is located in the wire slot and fixed between the slot wall of the wire slot and the winding in the slot, so as to fix the winding in the slot and leave a gap between the winding in the slot and the slot wall of the wire slot.

12. The stator core according to claim 10, characterized in that: An inclined surface is formed on one side of the end of the slot seal close to the outer side of the stator core. The inclined surface is at least partially located in the oil drain cavity and forms an oil injection port with the end seal.

13. The stator core according to claim 10, characterized in that: The end seal includes a plurality of sub-seals, each of which includes at least one body, at least one sealing buckle and at least one oil drain chamber, and the body, the sealing buckle and the oil drain chamber correspond to each other one by one.

14. The stator core according to claim 13, characterized in that: The plurality of sub-seals are independent of each other or at least some of the sub-seals are integrally formed structures.

15. A motor, characterized in that: include: A rotor and a stator, wherein the stator is coaxially arranged around the outer circumference of the rotor, and the stator comprises the stator core according to any one of claims 1 to 14.

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