Stator core, motor stator and motor

Abstract

The invention provides a stator iron core, a motor stator and a motor, and belongs to the technical field of electrical equipment, the stator iron core comprises a first iron core part, the first iron core part comprises at least two first punching sheets, and the two first punching sheets are sequentially laminated along the axis direction of the stator iron core; the first punching sheet is provided with a first gap and a second gap, the opening of the first gap is arranged towards the outside of the stator core along the radial direction of the stator core, and the opening of the second gap is arranged towards the inside of the stator core along the radial direction of the stator core; and in two adjacent first punching sheets in the axis direction of the stator core, the projections of the first notch in one first punching sheet and the second notch in the other first punching sheet in the axis direction of the stator core are at least partially intersected. According to the invention, media such as cooling oil can enter the winding groove through the circumferential channel, the first gap and the second gap, and directly contact structures such as a winding coil in the winding groove, so that direct cooling is realized, and the cooling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, in particular to a stator core, a motor stator and a motor. BACKGROUND

[0002] The thermal load generated by the motor during operation will directly affect the output of the motor peak, continuous performance and operation reliability, so the temperature rise of the motor is an important indicator of motor design and use. On the one hand, the temperature rise of the motor is related to various types of loss heating factors of the body, and on the other hand, the cooling structure of the motor is also inseparable. A good, efficient and simple cooling structure can not only reduce the temperature rise of the motor and improve the operation stability of the motor, but also prolong the service life of the motor. At present, the cooling methods of the motor mainly include air cooling, water cooling and oil cooling. Compared with air cooling, oil has strong heat conduction capacity, and compared with water cooling, the contact of oil with the main heating area makes the heat exchange more direct and efficient, so oil cooling gradually becomes the mainstream trend of motor heat dissipation. In the motor stator, the motor winding is usually one of the main heat sources, so that the temperature in the motor stator winding slot is usually high during the actual operation of the motor. In the related technology, the winding is usually sprayed by arranging an oil spray ring to cool the motor winding. The oil is difficult to reach the high-temperature area in the motor stator for direct cooling, and the cooling effect is poor. SUMMARY

[0003] The present application provides a stator core, a motor stator and a motor to solve the technical problem of poor motor cooling effect.

[0004] The present application provides a stator core, which comprises a first core part, the first core part comprises at least two first punching sheets, and the at least two first punching sheets are stacked in sequence along the axial direction of the stator core. A first notch is arranged on the first punching sheet, the opening of the first notch is arranged towards the outside of the stator core along the radial direction of the stator core, a circumferential oil channel is arranged on the outer circumferential surface of the stator core, the circumferential oil channel extends along the circumferential direction of the stator core, and the opening of the first notch is in communication with the circumferential oil channel. A second notch is further arranged on the first punching sheet, the opening of the second notch is arranged towards the inside of the stator core along the radial direction of the stator core, a winding slot extending along the axial direction of the stator core is arranged on the inner circumferential surface of the stator core, and the opening of the second notch is in communication with the winding slot. Among two first punching sheets adjacent in the axial direction of the stator core, the projection of the first notch on one first punching sheet and the second notch on the other first punching sheet in the axial direction of the stator core at least partially intersects.

[0005] In one embodiment of the present invention, a channel notch connected to the first notch is provided on the outer edge of the first punching sheet, and the opening of the channel notch is arranged radially outward along the stator core. In two first punching sheets adjacent in the axial direction of the stator core, the channel notch on one first punching sheet and the two channel notches adjacent in the circumferential direction of the other first punching sheet at least partially overlap in the axial direction of the stator core, so that the channel notches on the two first punching sheets are alternately connected in the circumferential direction of the stator core to form the circumferential channel.

[0006] In one embodiment of the present invention, winding notches are provided on the first punching sheet, and the winding notches are stacked along the axial direction of the stator core to form at least part of the winding slots, and the second notches are connected to the winding notches.

[0007] In one embodiment of the present invention, a second core part is further included, and the second core part includes a plurality of second punching sheets stacked in sequence along the axial direction of the stator core, and the winding gaps are also provided on the second punching sheets. The winding gaps on the second punching sheets and the winding gaps on the first punching sheets are stacked along the axial direction of the stator core to form at least part of the winding slots.

[0008] In one embodiment of the present invention, the stator core also includes a second core part, the first punching sheet has a base portion and a protrusion protruding from the outer edge of the base portion, the radial dimension of the base portion is smaller than the radial dimension of the second core part, and in two first punching sheets adjacent to each other in the axial direction of the stator core, the projections of the protrusion of one first punching sheet and the protrusion of the other first punching sheet in the axial direction of the stator core have no intersection.

[0009] In one embodiment of the present invention, the second core part includes a plurality of second punching sheets, which are stacked in sequence along the axial direction of the stator core. A first welding groove extending along the axial direction of the stator core is provided on the outer peripheral surface of the second core part. The first welding groove passes through the second core part. The protrusion of the first punching sheet adjacent to the second core part is provided corresponding to the first welding groove, and the protrusion blocks the port of the first welding groove.

[0010] The present invention also provides a motor stator, comprising a stator core as described in any one of the above items, wherein a winding wire is arranged in the winding slot of the stator core, an insulating structure is provided on a partial area of ​​the outer surface of the winding wire, and an installation gap is provided between the winding wire and the side wall of the winding slot, the insulating structure includes a first part respectively located in the installation gap on both sides of the winding wire, the first part cooperates with the winding wire to form a blocking structure, and the blocking structure blocks the notch of the winding slot to form an axial channel connected along the axial direction of the motor stator.

[0011] In one embodiment of the present invention, the insulation structure further includes at least two second portions, the two second portions being located at either end of the winding slot, respectively. The second portions are disposed around the winding conductor to block both ends of the axial channel. The stator core includes a third core portion located at an end of the stator core. The third core portion has an oil injection hole. The oil injection hole is disposed corresponding to a portion of the winding conductor exposed from the stator core, and the oil injection hole is connected to the axial channel between the two second portions.

[0012] In one embodiment of the present invention, the third core part includes a plurality of third punching sheets stacked in sequence along the axis direction of the motor stator, the winding gap is also provided on the third punching sheet, and the third punching sheet is also provided with an oil injection gap located at the bottom of the winding gap, the opening of the oil injection gap faces the interior of the stator core and is connected to the winding gap, and each of the oil injection gaps is stacked to form the oil injection hole.

[0013] The present invention further provides a motor, comprising the stator core as described in any one of the above items or the motor stator as described in any one of the above items.

[0014] Beneficial effects of the present invention: The present invention proposes a stator core, a motor stator, and a motor. Since the stator core includes first punching sheets stacked in sequence along the axial direction of the stator core, the first punching sheets are provided with a first notch and a second notch. The opening of the first notch is connected to the circumferential oil channel, and the second notch is connected to the winding slot. At the same time, in the axial direction of the motor stator, in two adjacent first punching sheets, the projections of the first notch on one first punching sheet and the second notch on the other first punching sheet in the axial direction of the motor stator at least partially intersect, that is, the first notch and the second notch can be connected through the overlapping portion of the projections, thereby making the circumferential channel connected to the winding slot. Heat exchange media such as cooling oil can enter the winding slot through the circumferential channel, the first notch, and the second notch, and directly contact structures such as the winding coil in the winding slot to achieve direct cooling, which is beneficial to improving cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0016] In the attached figure: Figure 1 A schematic diagram of a stator core provided in one embodiment of the present invention; Figure 2A partial schematic diagram of a first punching sheet provided in one embodiment of the present invention; Figure 3 A partial view of overlapping first punching sheets provided in one embodiment of the present invention; Figure 4 It is a partial three-dimensional schematic diagram of overlapping first punching sheets provided in one embodiment of the present invention; Figure 5 Schematic diagram of an insulating paper-wrapped winding conductor provided in one embodiment of the present invention; Figure 6 Schematic diagram of a blocking structure blocking a winding slot opening in one embodiment of the present invention; Figure 7 1 is a schematic diagram of the partial structure of the third punching sheet in one embodiment of the present invention; Figure 8 A schematic diagram of a stator core welding connection provided in one embodiment of the present invention; Figure 9 Schematic diagram of the cooling oil flow path in one embodiment of the present invention.

[0017] The figures are marked as follows: first core part 1, second core part 2, third core part 3, winding slot 4, winding wire 5, insulating paper 6, tooth structure 7, shell 8, circumferential channel 9, axial channel 10, protrusion 11, channel gap 12, first gap 13, second gap 14, winding gap 15, tooth part 16, overlapping area 17, first weld 21, second weld 22, oil injection hole 30, oil injection gap 31, first part 61, second part 62, oil inlet hole 81. DETAILED DESCRIPTION

[0018] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments. The details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. The following embodiments and features therein may be combined with one another without conflict.

[0019] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. The drawings only show components related to the present invention and are not 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 complex.

[0020] See Figures 1 to 8The embodiment provides a stator core, which comprises a first core part 1, the first core part 1 comprises at least two first punched sheets which are sequentially stacked along the axial direction of the stator core, and each first punched sheet is stacked to form the first core part 1 of the stator core. A circumferential channel is formed on the outer circumferential surface of the first core part 1, so that a heat exchange medium such as cooling oil can flow along the circumferential direction of the stator core, and the heat exchange medium such as cooling oil can be distributed to each part of the stator core in the circumferential direction of the stator core.

[0021] As shown in the figure, Figure 1 In the embodiment, the stator core further comprises a second core part 2. In some specific embodiments, one side of the first core part 1 is the second core part 2, and the other side of the first core part 1 is a blocking ring or other components. The blocking ring and the second core part 2 cooperatively form the circumferential channel with the first core part 1. Since the blocking ring component is located on only one side of the first core part 1, compared with two blocking ring components, it is beneficial to simplify the axial flow characteristics of the stator core, reduce the axial space occupied by the stator core, and also beneficial to simplify the structure of the motor stator and reduce the product cost.

[0022] In the embodiment, the first core part 1 is clamped between two second core parts 2, and the first core part 1 cooperatively forms the circumferential channel with the two second core parts 2. At this time, it is not necessary to set a blocking ring or other components, which is beneficial to further reduce the axial space occupied by the components such as the blocking ring in the stator core, simplify the structure of the motor stator, and reduce the product cost.

[0023] The first punched sheet is provided with a first notch 13 and a second notch 14. The opening of the first notch 13 is arranged towards the outside of the stator core in the radial direction of the stator core. A circumferential oil channel is arranged on the outer circumferential surface of the stator core and extends along the circumferential direction of the stator core. The opening of the first notch 13 is in communication with the circumferential oil channel. The opening of the second notch 14 is arranged towards the inside of the stator core in the radial direction of the stator core. A winding slot 4 extending along the axial direction of the stator core is arranged on the inner circumferential surface of the stator core. The opening of the second notch 14 is in communication with the winding slot 4.

[0024] In two adjacent first punching sheets in the axial direction of the stator core, the projections of the first notch 13 on one first punching sheet and the second notch 14 on the other first punching sheet in the axial direction of the stator core at least partially intersect, that is, the first notch 13 and the second notch 14 can be connected through the overlapping area 17 where the projections overlap. The first notch 13 and the second notch 14 are connected as a radial channel, and the circumferential channel is connected to the winding slot 4 through the radial channel. Between adjacent winding slots 4 is the tooth structure 7 of the stator core. The winding coil of the motor stator is wound on the tooth structure 7, and the winding wire 5 of the winding coil is installed in the winding slot 4. Medium such as cooling oil can enter the winding slot 4 through the circumferential channel, the first notch 13 and the second notch 14, and can directly contact the structures in the winding slot 4 such as the winding coil, thereby achieving direct cooling of the main heat-generating components of the stator, which is beneficial to improving the cooling efficiency of the motor.

[0025] like Figure 2 As shown, in this embodiment, the depth directions of the first notch 13 and the second notch 14 are parallel to the radial direction of the stator core at the corresponding position, so as to reduce the length of the radial channel, which is conducive to improving the circulation efficiency of the heat exchange medium, and further helps to improve the overall heat exchange effect of the heat exchange medium on the stator core and the motor stator. In other optional embodiments, the depth directions of the first notch 13 and the second notch 14 can also be inclined to the radial direction of the stator core at the corresponding position to extend the length of the radial channel, increase the flow distance of the heat exchange medium such as cooling oil in the radial channel, and further improve the heat exchange effect between the heat exchange medium and the area of ​​the first core portion 1 where the radial channel is provided.

[0026] like Figures 2 to 4 As shown, in this embodiment, a channel notch 12 connected to the first notch 13 is provided on the outer edge of the first punching sheet, and the opening of the channel notch 12 is arranged radially outward along the stator core. In two first punching sheets adjacent to each other in the axial direction of the stator core, the channel notch 12 on one first punching sheet and the two channel notches 12 adjacent to each other in the circumferential direction of the other first punching sheet in the axial direction of the stator core at least partially overlap in their projections in the axial direction of the stator core, so that the channel notches 12 on the two first punching sheets are alternately connected to form a circumferential channel in the circumferential direction of the stator core.

[0027] like Figure 1 As shown, the circumferential channel is slot-shaped, with the slot opening of the circumferential channel facing the exterior of the stator core, allowing heat exchange medium outside the stator core to enter the circumferential channel through the slot opening. In this embodiment, the circumferential channel is connected end to end and surrounds the stator core. After entering the circumferential channel, the heat exchange medium can flow in both the forward and reverse directions of the circumferential channel, which facilitates the heat exchange medium in the circumferential channel to flow along the shortest path, thereby improving the flow efficiency of the heat exchange medium.

[0028] In this embodiment, the first notch 13 is formed at the bottom of the channel notch 12, and the same channel notch 12 can be connected to multiple first notches 13. Specifically, in this embodiment, the same channel notch 12 is connected to three first notches 13. The same channel notch 12 is connected to multiple first notches 13, which can reduce the number of channel notches 12 and reduce the difficulty of processing the first punching sheet.

[0029] In this embodiment, the first punching sheet is provided with a winding notch 15, and the second notch 14 is connected to the winding notch 15. The winding notches 15 are stacked along the axis of the stator core to form at least part of the winding slots 4.

[0030] Specifically, in this embodiment, the second core portion 2 includes a plurality of second punchings stacked sequentially along the stator core axis. The second punchings are also provided with winding notches 15. The winding notches 15 on the second punchings and the winding notches 15 on the first punchings are stacked along the stator core axis to form at least a portion of the winding slots 4. Teeth 16 are formed between adjacent winding notches 15 on the first and second punchings. The stacked teeth 16 form the stator core's tooth structure 7.

[0031] The number of first punching sheets can be appropriately selected based on actual needs, for example, 2 or 3. Increasing the number of first punching sheets increases the cross-sectional area of ​​the circumferential and radial channels. The second punching sheets have greater structural strength than the first punching sheets. Reducing the number of first punching sheets allows for an increase in the number of second punching sheets, which improves the overall structural strength of the stator core.

[0032] like Figures 2 to 4 As shown, in this example, the first punching sheet has a base portion and a protrusion 11 protruding from the outer edge of the base portion, and the radial dimension of the base portion is smaller than the radial dimension of the second core portion 2 to form a channel gap 12. In two adjacent first punching sheets, the projections 11 of one first punching sheet and the projections 11 of the other first punching sheet have no intersection in the axial direction of the stator core, that is, in two adjacent first punching sheets in the axial direction of the stator core, the projections 11 of one first punching sheet and the projections 11 of the other first punching sheet are offset from each other. Therefore, on the path of the circumferential channel, that is, in the circumferential direction of the stator core, the projections 11 will not block the circumferential channel, and the flow of the circumferential channel is maintained.

[0033] In this embodiment, the radial dimension of the first punch at the protrusion 11 is the same as the radial dimension of the second core portion 2, that is, the outer diameter of the first punch at the protrusion 11 is the same as the outer diameter of the second core portion 2 as a whole. The protrusion 11, as a process feature, allows the first and second punches to share the same outer diameter positioning structure for positioning in a mold that relies on outer diameter positioning, simplifying the sheet sorting process. When using an in-mold dispensing production process, the first and second punches can also be blanked at the same stamping station, simplifying the production equipment and process, facilitating the mass production of the first and second punches, and thus facilitating the mass production of the stator core.

[0034] At the same time, the outer diameter of the first punch at the protrusion 11 is the same as the outer diameter of the second core portion 2 as a whole, which helps maintain the consistency of the outer circumferential dimensions of the stator core and the motor stator. When the motor stator is installed in the motor housing, it is easy to install the motor stator. The protrusion 11 cooperates with the inner wall of the housing to increase the support of the motor stator to the housing and also helps to increase the interference fit area between the motor stator and the housing.

[0035] In this embodiment, the second core portion 2 includes a plurality of second punchings, which are stacked in sequence along the stator core axis. In some optional embodiments, the second punchings, the first punchings, and the second and first punchings can be connected by bonding. In other optional embodiments, the second punchings, the first punchings, and the second and first punchings can be connected by welding.

[0036] When welding is used for connection, a first welding groove extending along the axial direction of the stator core is provided on the outer peripheral surface of the second core part 2. The first welding groove passes through the second core part 2. The protrusion 11 of the first punching sheet adjacent to the second core part 2 is provided corresponding to the first welding groove. The protrusion 11 blocks the port of the first welding groove.

[0037] like Figure 8As shown, in this embodiment, a first welding notch is provided on the outer edge of the second punching sheet. After the second core parts 2 are stacked in sequence, the first welding notch is stacked into a first welding groove. After the stator core is welded, the first welding groove forms a first weld 21. The first weld 21 passes through the second core part 2 and connects each second punching sheet of the second core part 2. Due to the processing technology, it is difficult for the first weld 21 to completely block the first welding groove. After the cooling oil or other heat exchange medium enters the circumferential channel, it is easy to leak from the first weld 21, which can easily lead to a decrease in pressure. The cooling oil or other heat exchange medium cannot flow completely according to the designed path, affecting the heat exchange effect. In this embodiment, the protrusion 11 blocks the port of the first welding groove, which has a blocking effect on the first welding groove, which is conducive to preventing the cooling oil or other heat exchange medium from leaking from the first weld 21 after entering the circumferential channel, thereby helping to maintain oil pressure and allowing the cooling oil or other heat exchange medium to flow according to the designed path.

[0038] like Figure 3 、 Figure 4 As shown, in the first core portion 1 of this embodiment, the angle between the protruding directions of two adjacent protrusions 11 in the circumferential direction of the stator core is a. In this embodiment, the angle between the protruding directions of two adjacent protrusions 11 is the acute angle formed by the intersection of the center lines of the two adjacent protrusions 11 extending in the radial direction of the stator core, a=360n / s, n is greater than 1 and less than s / 3, n is a positive integer, s is the number of teeth 16 or winding gaps 15 on the first punching sheet or the second punching sheet, that is, the number of stator winding slots 4 or tooth structures 7 of the motor. For example, s can be 36, n can be 3, and the angle a is 30° In this embodiment, a second welding notch is further provided on the outer edge of the second punch adjacent to the first punch. The radial dimension of the second punch at the bottom of the second welding notch is the same as the radial dimension of the base portion of the first punch. Therefore, the second punch can form a second weld 22 at the second welding notch. The second weld 22 can extend along the axial direction of the stator core to the first punch, thereby connecting the first punch and the second punch.

[0039] like Figure 8 As shown, in this embodiment, the second welding notches of the second core parts 2 on both sides of the first core part 1 are aligned with each other, and the second weld 22 extends from the second core part 2 on one side of the first core part 1 to the first core part 1, and can continue to extend to the second core part 2 on the other side of the first core part 1, so that the second weld 22 can weld the first core part 1 and the second core parts 2 on both sides of the first core part 1 together.

[0040] In some embodiments, the projection shape of each first punching piece in the direction of the stator core axis can be different, so that when the first punching pieces are laminated, the channel notches 12 on the adjacent first punching pieces are staggered with each other in the direction of the stator core axis, and then the channel grooves on the adjacent first punching pieces are alternately connected to form circumferential channels in the circumferential direction of the stator core. At the same time, the winding notches 15 on the first punching pieces are correspondingly arranged to form winding slots 4.

[0041] In the present embodiment, the projection shape of each first punching piece in the direction of the stator core axis is the same, and the adjacent first punching pieces are rotated by a certain angle, so that in the two adjacent first punching pieces in the direction of the stator core axis, the channel notches 12 on one first punching piece can respectively overlap with the two adjacent channel notches 12 on the adjacent first punching piece. After rotation, the two adjacent channel notches 12 on the same first punching piece can be connected to each other through the channel notches 12 on the other channel piece.

[0042] Since the projection shape of each first punching piece in the direction of the stator core axis is the same, each first punching piece can be machined by the same equipment, which is beneficial to reduce the type of punching pieces and reduce the cost of equipment investment. The rotation angle between the two adjacent first punching pieces is an integer multiple of the included angle between the opening directions of the two adjacent channel notches 12 on the first punching piece, so that after the rotation between the two adjacent first punching pieces, the winding notches 15 of the two adjacent first punching pieces can still be aligned.

[0043] The present embodiment also provides a motor stator, which comprises the stator core according to any one of the above, and the winding slots 4 of the stator core are provided with winding wires 5. The winding wires 5 are provided on a part of the outer surface of the part of the winding wires 5 arranged in the winding slots 4 of the motor stator winding coil with an insulation structure. The winding wires 5 and the side wall of the winding slot 4 have a mounting gap. The insulation structure comprises a first part 61 located in the mounting gap on both sides of the winding wire 5. The first part 61 cooperates with the winding wire 5 to form a plugging structure. The plugging structure plugs the slot opening of the winding slot 4 to form an axial channel communicating in the axial direction of the motor stator. The plugging structure can constrain the flow path of the heat exchange medium in the winding slot 4, so as to avoid the heat exchange medium from flowing out of the designed path accidentally during the flow process.

[0044] In the present embodiment, the insulation structure further comprises at least two second parts 62, and the two second parts 62 are respectively located at the two ends of the winding slot 4. The second part 62 is arranged around the winding wire 5 to plug the two ends of the axial channel. The stator core comprises a third core part 3 located at the end of the stator core. The third core part 3 has an oil injection hole 30 corresponding to the part of the winding wire 5 exposed from the stator core. The oil injection hole 30 communicates with the axial channel between the two second parts 62.

[0045] In some embodiments, the insulation structure can be a mounting bracket. As shown in Figure 5 and Figure 6 As shown, in this embodiment, the insulation structure is insulating paper 6, which is wrapped around the outer surface of the winding conductor 5. The insulating paper 6 has a hollow area in the middle. The first portion 61 is located near the inner area of ​​the motor stator relative to the hollow area, and the two second portions 62 are located on either side of the hollow area along the motor stator axis. Heat transfer media such as cooling oil can flow through the hollow area. The insulating paper 6 has the advantages of simple structure and low cost. In this embodiment, the insulating paper 6 is foamed insulating paper, which can enhance the sealing effect of the plugging structure.

[0046] like Figure 7 As shown, in this embodiment, the third core part 3 includes a plurality of third punching sheets stacked in sequence along the axis direction of the motor stator, and the third punching sheets are also provided with winding gaps 15. The third punching sheets are also provided with oil injection gaps 31 located at the bottom of the winding gaps 15. The opening of the oil injection gap 31 faces the interior of the stator core and is connected to the winding gaps 15. Figure 6 As shown, the individual oil injection notches 31 are stacked to form an oil injection hole 30. In this embodiment, the radial projection of the oil injection hole 30 at least partially overlaps with the hollowed-out area in the middle of the insulating paper 6, thereby connecting the oil injection hole 30 to the axial channel, allowing heat exchange media such as cooling oil to enter the oil injection hole 30 through the axial channel. In this embodiment, the oil injection hole 30 is positioned toward the portion of the winding coil exposed in the winding slot 4 to direct the cooling oil to the portion of the winding coil exposed in the winding slot 4, thereby cooling this portion.

[0047] This embodiment provides a motor, comprising the stator core as described in any one of the above items or the motor stator as described in any one of the above items. Figure 9 As shown, Figure 9 The thick solid arrows indicate the flow path of the heat exchange medium. In this embodiment, the motor further includes a housing 8, which is provided with an oil inlet 81. Oil inlet 81 is arranged in the direction of the motor's axis, corresponding to the circumferential channel 9 of the stator core. That is, the height of oil inlet 81 in the direction of the motor's axis is consistent with the height of circumferential channel 9 in the direction of the motor's axis. After entering the housing 8 through the oil inlet, a heat exchange medium such as cooling oil can flow into the circumferential channel 9, then enter the winding slots 4, i.e., the axial channel 10, via the radial channels of the first core portion 1, thereby directly cooling the stator winding coils.

[0048] In summary, the stator core, motor stator and motor provided by the embodiment have the following advantages: the stator core comprises first punching sheets stacked along the axial direction of the stator core in sequence, the first punching sheets are provided with first notches and second notches, the opening of the first notch is communicated with the circumferential oil channel, and the second notch is communicated with the winding slot. Meanwhile, in the axial direction of the motor stator, among two adjacent first punching sheets, the projection of the first notch on one first punching sheet and the projection of the second notch on the other first punching sheet in the axial direction of the motor stator at least partially intersect, that is, the first notch and the second notch can be communicated through the overlapping projection, so that the circumferential channel is communicated with the winding slot. The medium such as cooling oil can enter the winding slot through the circumferential channel, the first notch and the second notch, directly contact the structure such as winding coil in the winding slot, and directly cool, which is beneficial to improve the cooling efficiency.

[0049] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the present application should be covered by the claims of the present application.

[0050] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application, however, it is obvious for those skilled in the art that the embodiments of the present application can be implemented without these specific details, and in other embodiments, the known structures and devices are shown in the form of block diagrams instead of details to avoid making the embodiments of the present application difficult to understand.

Claims

1. A stator core, characterized in that: The stator core comprises a first core portion, wherein the first core portion comprises at least two first punching sheets, and the at least two first punching sheets are stacked in sequence along the axis direction of the stator core; A first notch is provided on the first punching sheet, the opening of the first notch being arranged along the radial direction of the stator core toward the outside of the stator core; a circumferential oil passage is provided on the outer peripheral surface of the stator core, the circumferential oil passage extending along the circumference of the stator core, and the opening of the first notch being in communication with the circumferential oil passage; A second notch is further provided on the first punching sheet, wherein an opening of the second notch is arranged along the radial direction of the stator core toward the interior of the stator core, and a winding slot extending along the axis of the stator core is provided on the inner circumferential surface of the stator core, and the opening of the second notch is communicated with the winding slot; Among them, in two first punches adjacent to each other in the axial direction of the stator core, projections of the first notch on one first punch and the second notch on the other first punch in the axial direction of the stator core at least partially intersect.

2. The stator core according to claim 1, characterized in that A channel notch connected to the first notch is provided on the outer edge of the first punching sheet, and the opening of the channel notch is arranged radially outward along the stator core. In two first punching sheets adjacent in the axial direction of the stator core, the channel notch on one first punching sheet and the two channel notches adjacent in the circumferential direction of the other first punching sheet at least partially overlap in the axial direction of the stator core, so that the channel notches on the two first punching sheets are alternately connected in the circumferential direction of the stator core to form the circumferential channel.

3. The stator core according to claim 1, characterized in that The first punching sheet is provided with winding notches, each of the winding notches is stacked along the axial direction of the stator core to form at least a portion of the winding slot, and the second notch is communicated with the winding notches.

4. The stator core according to claim 3, characterized in that It also includes a second core part, which includes a plurality of second punching sheets stacked in sequence along the axial direction of the stator core, and the winding gaps are also provided on the second punching sheets. The winding gaps on the second punching sheets and the winding gaps on the first punching sheets are stacked along the axial direction of the stator core to form at least part of the winding slots.

5. The stator core according to claim 1, characterized in that The stator core also includes a second core part, the first punching sheet has a base portion and a protrusion protruding from the outer edge of the base portion, the radial dimension of the base portion is smaller than the radial dimension of the second core portion, and in two first punching sheets adjacent to each other in the axial direction of the stator core, the projections of one first punching sheet and the protrusion of the other first punching sheet in the axial direction of the stator core have no intersection.

6. The stator core according to claim 5, characterized in that The second core part includes a plurality of second punching sheets, which are stacked in sequence along the axial direction of the stator core. A first welding groove extending along the axial direction of the stator core is provided on the outer peripheral surface of the second core part. The first welding groove passes through the second core part. The protrusion of the first punching sheet adjacent to the second core part is provided corresponding to the first welding groove, and the protrusion blocks the port of the first welding groove.

7. A motor stator, characterized in that: The stator core comprises the stator core according to any one of claims 1 to 6, wherein a winding wire is arranged in a winding slot of the stator core, an insulating structure is provided on a partial area of ​​the outer surface of the winding wire, an installation gap is provided between the winding wire and the side wall of the winding slot, and the insulating structure includes a first portion respectively located in the installation gap on both sides of the winding wire, the first portion cooperates with the winding wire to form a blocking structure, and the blocking structure blocks the notch of the winding slot to form an axial channel connected along the axial direction of the motor stator.

8. The motor stator according to claim 7, characterized in that: The insulation structure also includes at least two second parts, which are respectively located at the two ends of the winding slot. The second parts are arranged around the winding wire to block the two ends of the axial channel. The stator core includes a third core part located at the end of the stator core. The third core part has an oil injection hole. The oil injection hole is arranged corresponding to the portion of the winding wire exposed from the stator core. The oil injection hole is connected to the axial channel between the two second parts.

9. The motor stator according to claim 8, characterized in that: The third core part includes a plurality of third punching sheets stacked in sequence along the axis direction of the motor stator, the winding gap is also provided on the third punching sheet, and the third punching sheet is also provided with an oil injection gap located at the bottom of the winding gap, the opening of the oil injection gap faces the interior of the stator core and is connected to the winding gap, and each of the oil injection gaps is stacked to form the oil injection hole.

10. A motor, characterized in that: It comprises the stator core according to any one of claims 1 to 6 or the motor stator according to any one of claims 7 to 9.

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