Stator core and motor

Abstract

The utility model provides a stator core and a motor, the stator core is formed by stacking a plurality of stator punching sheets, at least a part of the stator punching sheets are provided with a plurality of oil inlet grooves along the circumferential direction, and each oil inlet groove is communicated with a wire groove; wherein when a plurality of stator punching sheets distributed with the oil inlet grooves are stacked to form a stacked body, each wire slot on the stacked body is communicated with at least one oil inlet groove; one end of each oil inlet groove is communicated with the wire groove, and the other end of each oil inlet groove is communicated with the oil distribution groove; and the oil inlet is arranged on the outer circumference of the stator punching sheet and is communicated with the oil distribution groove. According to the utility model, through the cooperation between the oil inlet grooves and the oil distribution grooves which are through in the circumferential direction, cooling oil flows into different oil inlet grooves so as to enter each wire slot to cool the winding in the slot, so that the winding can be directly cooled in the slot, and the cooling effect is better.

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] To achieve the above-mentioned purpose and other related purposes, the utility model provides a stator core, comprising: a plurality of stator punching sheets stacked together, at least a portion of the stator punching sheets having a plurality of oil inlet grooves distributed along the circumference thereof, each of the oil inlet grooves being connected to a wire slot;

[0006] Wherein, when a plurality of stator punching sheets with the oil inlet grooves distributed thereon are stacked to form a stack, each of the wire slots on the stack is connected to at least one of the oil inlet grooves;

[0007] One end of the oil inlet groove is connected to the wire groove, and the other end is connected to the oil distribution groove, and the oil distribution groove is connected along the circumference of the stator core.

[0008] The oil inlet is arranged on the outer circumference of the stator punching sheet and is communicated with the oil distribution groove.

[0009] In one embodiment of the utility model, the stator punching sheet includes a first stator punching sheet and a second stator punching sheet, and the first stator punching sheet and the second stator punching sheet have a plurality of wire slots distributed along their circumferential direction, 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 respectively 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 the 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, the stator punching sheets include a third stator punching sheet and a fourth stator punching sheet, each wire slot on the third stator punching sheet is connected to an oil inlet groove, the diameter of the fourth stator punching sheet is smaller than the diameter of the third stator punching sheet, a plurality of the fourth stator punching sheets are stacked to form a stacking body, the third stator punching sheets are stacked on both sides of the stacking body, the oil distribution groove is formed between the third stator punching sheets on both sides of the stacking body, and the oil inlet groove is connected to the oil distribution groove.

[0017] 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.

[0018] The utility model provides a stator core and a motor. Some 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 stacked body, each wire slot on the stacked body 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 to enter each wire slot to cool the winding in the slot, so that the winding can be directly cooled in the slot, and the cooling effect is better.

[0019] 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.

[0020] 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 The utility model is a schematic structural diagram of a stator core in one embodiment.

[0023] Figure 2This is a schematic structural diagram of the first stator punching sheet in the first embodiment of the present invention.

[0024] Figure 3 It is a schematic structural diagram of the second stator punching sheet in the first embodiment of the utility model.

[0025] Figure 4 This is a schematic diagram of the oil circuit in the first embodiment of the present utility model.

[0026] Figure 5 This is a schematic diagram of the structure of the first stator punching sheet in the second embodiment of the present invention.

[0027] 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.

[0028] Figure 7 This is a schematic diagram of the structure of the first stator punching sheet in the third embodiment of the present invention.

[0029] Figure 8 This is a schematic diagram of the structure of the second stator punching sheet in the third embodiment of the present invention.

[0030] Fig. 9 It is a schematic structural diagram of a stator core in another embodiment of the utility model.

[0031] Fig.10 This is a schematic diagram of the structure of the third stator punching sheet in the fourth embodiment of the present utility model.

[0032] Fig.11 It is a schematic structural diagram of the fourth stator punching sheet in the fourth embodiment of the present utility model.

[0033] Description of labels:

[0034] 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, protrusion structure; 107, oil inlet cavity; 13, third stator punching sheet; 14, fourth stator punching sheet; 10, first stacking body. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] See also Figures 1 to 11 As 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.

[0039] See also Figures 1 to 8As 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.

[0040] 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:

[0041] For example, see Figures 1 to 8 As 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.

[0042] 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.

[0043] 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.

[0044] See also Figure 2 and Figure 3 As 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] See also Figures 9 to 11As shown, in the fourth embodiment, the stator sheet includes a third stator sheet 13 and a fourth stator sheet 14, each line slot 102 on the third stator sheet 13 is connected to an oil inlet groove 101, and the diameter of the fourth stator sheet 14 is smaller than the diameter of the third stator sheet 13. When the third stator sheet 13 and the fourth stator sheet 14 are stacked to form a stack, a plurality of the fourth stator sheets 14 are stacked to form a sub-stack, and the third stator sheets 13 are stacked on both sides of the sub-stack. Since the diameter of the third stator sheet 13 is larger than the diameter of the fourth stator sheet 14, diameter, therefore, an annular groove is formed between the third stator punches 13 on both sides of the sub-stack formed by stacking a plurality of the fourth stator punches 14, and the annular groove is the oil distribution groove 103, and because the diameter of the third stator punch 13 is greater than the diameter of the fourth stator punch 14, the oil inlet groove 101 on the third 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, and at this time, the oil inlet port 104 is an annular opening formed along its circumference, and the oil inlet port 104 forms an integral structure with the oil distribution groove 103.

[0055] It can be understood that by setting some stator punching sheets in the stator core 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. The structure is simple and easy to process.

[0056] It should be noted that, in this embodiment, the stator core may include a plurality of stacks formed by stacking different stator punches, wherein some of the stacks may include a first stack 10 formed by stacking the first stator punches 11 and the second stator punches 12, and may also include a second stack formed by stacking the third stator punches 13 and the fourth stator punches 14.

[0057] 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.

[0058] See also Figures 1 to 11 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.

[0059] The utility model provides a stator core and a motor. Some 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 stacked body, each wire slot on the stacked body 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 to enter each wire slot to cool the winding in the slot, so that the winding can be directly cooled in the slot, and the cooling effect is better.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] Except for the technical features described in the specification, the other technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present utility model, the other technical features will not be described in detail here.

Claims

1. A stator core, characterized in that: include: A plurality of stator punching sheets are stacked, at least a portion of the stator punching sheets are provided with a plurality of oil inlet grooves distributed along the circumference thereof, and each of the oil inlet grooves is connected to a wire slot; Wherein, when a plurality of stator punching sheets with the oil inlet grooves distributed thereon are stacked to form a stack, each of the wire slots on the stack is connected to at least one of the oil inlet grooves; One end of the oil inlet groove is connected to the wire groove, and the other end is connected to the oil distribution groove, and the oil distribution groove is connected along the circumference of the stator core; The oil inlet is arranged on the outer circumference of the stator punching sheet and is communicated with the oil distribution groove.

2. The stator core according to claim 1, characterized in that: The stator punching sheet includes a first stator punching sheet and a second stator punching sheet, wherein the first stator punching sheet and the second stator punching sheet have a plurality of wire slots distributed along their circumferential direction, 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 the 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: The stator punching sheets include a third stator punching sheet and a fourth stator punching sheet, each wire slot on the third stator punching sheet is connected to an oil inlet groove, the diameter of the fourth stator punching sheet is smaller than the diameter of the third stator punching sheet, a plurality of the fourth stator punching sheets are stacked to form a stacking body, the third stator punching sheets are stacked on both sides of the stacking body, the oil distribution groove is formed between the third stator punching sheets on both sides of the stacking body, and the oil inlet groove is connected to the oil distribution groove.

10. 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 9.

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