A stator core, a motor stator and a motor

Abstract

The utility model provides a kind of stator core, motor stator and motor, belong to electrical equipment technical field, including first core part, first core part includes at least two first punching sheet, two first punching sheet is sequentially laminated along the axis direction of stator core;First punching sheet is provided with first gap and second gap, the opening of first gap is set along the radial direction of stator core towards stator core outside, the opening of second gap is set along the radial direction of stator core towards stator core inside;Wherein, in the axis direction of stator core, in two first punching sheet adjacent, first gap on a first punching sheet and second gap on another first punching sheet at least partially intersect in the projection of the axis direction of stator core.In the utility model, cooling oil and other medium can enter winding slot by circumferential passage, first gap and second gap, directly contact structure such as winding coil in winding slot, realize direct cooling, it is favorable to promote cooling efficiency.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a stator core, a motor stator, and a motor. Background Technology

[0002] The thermal load generated by an electric motor during operation directly affects its peak and continuous output performance and operational reliability. Therefore, motor temperature rise is a crucial indicator in motor design and use. Motor temperature rise is related to various heat-generating factors within the motor itself, as well as its cooling structure. A good, efficient, and simple cooling structure can not only reduce motor temperature rise and improve operational stability but also extend its service life. Currently, motor cooling methods primarily include air cooling, water cooling, and oil cooling. Compared to air cooling, oil has stronger thermal conductivity, and compared to water cooling, oil's contact with the heat-generating areas makes heat exchange more direct and efficient. Therefore, oil cooling is gradually becoming the mainstream trend for drive motor heat dissipation. In the motor stator, the motor windings are usually one of the main heat sources, resulting in consistently high temperatures within the stator winding slots during actual motor operation. In related technologies, oil spray rings are typically used to spray the windings for cooling. However, oil cannot directly reach the high-temperature areas of the motor stator for direct cooling, leading to poor cooling effectiveness. Utility Model Content

[0003] This utility model provides a stator core, a motor stator, and a motor to solve technical problems such as poor motor cooling effect.

[0004] The present invention provides a stator core, including a first core portion, the first core portion including at least two first laminations, the at least two first laminations being stacked sequentially along the axial direction of the stator core; The first lamination has a first notch, the opening of the first notch is arranged radially toward the outside of the stator core, a circumferential channel is arranged on the outer circumferential surface of the stator core, the circumferential channel extends circumferentially along the stator core, and the opening of the first notch communicates with the circumferential channel. The first lamination is also provided with a second notch, the opening of the second notch is provided in the radial direction of the stator core toward the interior of the stator core, and a winding slot is provided on the inner circumferential surface of the stator core extending along the axis of the stator core, and the opening of the second notch communicates with the winding slot. In particular, among two adjacent first laminations in the axial direction of the stator core, the projections of a first notch on one first lamination and a second notch on the other first lamination in the axial direction of the stator core at least partially intersect.

[0005] In one embodiment of the present invention, a channel notch communicating with the first notch is provided on the outer edge of the first lamination. The opening of the channel notch is arranged radially outward along the stator core. In two adjacent first laminations in the axial direction of the stator core, the channel notch on one first lamination and two adjacent channel notches on the other first lamination in the circumferential direction of the first lamination at least partially overlap in projection on the axial direction of the stator core, so that the channel notches on the two first laminations alternately communicate in the circumferential direction of the stator core to form the circumferential channel.

[0006] In one embodiment of the present invention, the first lamination is provided with a winding notch, and each of the winding notches is stacked along the axial direction of the stator core to form at least part of the winding slot, and the second notch is connected to the winding notch.

[0007] In one embodiment of the present invention, a second core portion is further included. The second core portion includes a plurality of second laminations stacked sequentially along the axial direction of the stator core. The second laminations are also provided with the winding notches. The winding notches on the second laminations and the winding notches on the first laminations are stacked along the axial direction of the stator core to form at least a portion of the winding slots.

[0008] In one embodiment of the present invention, the stator core further includes a second core portion. The first lamination has a base portion and a protrusion extending beyond 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. In two adjacent first laminations along the axial direction of the stator core, the projections of the protrusions of one first lamination and the protrusions of the other first lamination along the axial direction of the stator core do not intersect.

[0009] In one embodiment of the present invention, the second core portion includes a plurality of second laminations, which are stacked sequentially along the axis of the stator core. A first welding groove extending along the axis of the stator core is provided on the outer peripheral surface of the second core portion. The first welding groove penetrates the second core portion. The protrusion of the first lamination adjacent to the second core portion corresponds to the first welding groove, and the protrusion blocks the port of the first welding groove.

[0010] This utility model also provides a motor stator, including a stator core as described in any of the preceding claims. A winding conductor is disposed in the winding slot of the stator core. An insulating structure is disposed on a portion of the outer surface of the winding conductor. An installation gap exists between the winding conductor and the sidewall of the winding slot. The insulating structure includes a first portion located within the installation gap on both sides of the winding conductor. The first portion cooperates with the winding conductor to form a sealing structure. The sealing structure seals the slot opening of the winding slot to form an axial channel communicating 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 parts, the two second parts being located at both ends of the winding slot, the second parts being arranged around the winding conductor to block both ends of the axial channel, the stator core including a third core part located at the end of the stator core, the third core part having an oil spray hole, the oil spray hole being arranged corresponding to the portion of the winding conductor exposed in the stator core, the oil spray hole being connected to the axial channel between the two second parts.

[0012] In one embodiment of the present invention, the third core portion includes a plurality of third laminations stacked sequentially along the direction of the motor stator axis. The third laminations are also provided with the winding notch and an oil injection notch located at the bottom of the winding notch. The opening of the oil injection notch faces the interior of the stator core and communicates with the winding notch. Each of the oil injection notches stacked together forms the oil injection hole.

[0013] This utility model also provides an electric motor, including a stator core as described in any of the preceding claims or an electric motor stator as described in any of the preceding claims.

[0014] The beneficial effects of this utility model are as follows: This utility model proposes a stator core, a motor stator, and a motor. The stator core includes first laminations stacked sequentially along the stator core axis. Each first lamination has a first notch and a second notch. The opening of the first notch communicates with a circumferential channel, and the second notch communicates with a winding slot. Simultaneously, along the axial direction of the motor stator, the projections of the first notch on one first lamination and the second notch on the other first lamination along the axial direction of the motor stator at least partially intersect. That is, the first and second notches can communicate through the overlapping portion of their projections, thereby enabling the circumferential channel to communicate with 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, directly contacting structures such as the winding coil within the winding slot, achieving direct cooling and improving cooling efficiency. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram: Figure 1 This is a schematic diagram of a stator core provided in one embodiment of the present invention; Figure 2 This is a partial schematic diagram of the first lamination provided in one embodiment of the present invention; Figure 3 This is a partial view of the overlapping of the first laminations provided in one embodiment of the present invention; Figure 4 This is a partial three-dimensional schematic diagram of the overlapping of the first laminations provided in one embodiment of the present invention; Figure 5 This is a schematic diagram of an insulating paper-covered winding conductor provided in one embodiment of the present invention; Figure 6 This is a schematic diagram of the sealing structure sealing the winding slot opening in one embodiment of the present invention; Figure 7 This is a partial structural schematic diagram of the third lamination in one embodiment of the present invention; Figure 8 This is a schematic diagram of the stator core welding connection provided in one embodiment of the present utility model; Figure 9 This is a schematic diagram of the cooling oil flow path in one embodiment of the present invention.

[0017] The reference numerals in the attached drawings are as follows: First core section 1, Second core section 2, Third core section 3, Winding slot 4, Winding wire 5, Insulating paper 6, Toothed structure 7, Shell 8, Circumferential channel 9, Axial channel 10, Protrusion 11, Channel notch 12, First notch 13, Second notch 14, Winding notch 15, Tooth 16, Overlapping area 17, First weld 21, Second weld 22, Oil spray hole 30, Oil spray notch 31, First part 61, Second part 62, Oil inlet hole 81. Detailed Implementation

[0018] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] Please see Figures 1-8 This embodiment provides a stator core, including a first core portion 1. The first core portion 1 includes at least two first laminations stacked sequentially along the axial direction of the stator core, with each first lamination forming the first core portion 1 of the stator core. A circumferential channel is formed on the outer peripheral surface of the first core portion 1 to allow a heat exchange medium, such as cooling oil, to flow along the circumference of the stator core, thereby enabling the heat exchange medium, such as cooling oil, to be distributed throughout the stator core in the circumferential direction.

[0021] like Figure 1 As shown, in this embodiment, the stator core also includes a second core portion 2. In some specific embodiments, one side of the first core portion 1 is the second core portion 2, and the other side of the first core portion 1 is a retaining ring or other components. The retaining ring and the second core portion 2 cooperate with the first core portion 1 to form a circumferential channel. Since the retaining ring component is only located on one side of the first core portion 1, compared with two retaining 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 to simplify the motor stator structure and reduce product costs.

[0022] In this embodiment, the first iron core portion 1 is sandwiched between two second iron core portions 2. The first iron core portion 1 cooperates with the two second iron core portions 2 to form a circumferential channel. At this time, there is no need to set up components such as retaining rings, which helps to further reduce the axial space occupied by components such as retaining rings in the stator iron core, simplify the stator structure of the motor, and reduce product costs.

[0023] The first lamination has a first notch 13 and a second notch 14. The opening of the first notch 13 is radially oriented towards the outside of the stator core. A circumferential channel 9 is provided on the outer circumferential surface of the stator core, extending circumferentially along the stator core. The opening of the first notch 13 communicates with the circumferential channel 9. The opening of the second notch 14 is radially oriented towards the inside of the stator core. A winding slot 4 extending along the axis of the stator core is provided on the inner circumferential surface of the stator core. The opening of the second notch 14 communicates with the winding slot 4.

[0024] In two adjacent first laminations along the axial direction of the stator core, the projections of the first notch 13 on one first lamination and the second notch 14 on the other first lamination along 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 of the overlapping projections. The connection between the first notch 13 and the second notch 14 forms 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 coils of the motor stator are wound on the tooth structure 7, and the winding wires 5 of the winding coils are installed in the winding slots 4. Mediums such as cooling oil can enter the winding slots 4 through the circumferential channel, the first notch 13 and the second notch 14, and can directly contact the structures such as the winding coils in the winding slots 4, thereby achieving direct cooling of the main heat-generating components of the stator and 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 positions, so as to reduce the length of the radial channel, which is beneficial to improving the circulation efficiency of the heat exchange medium, and thus beneficial to improving the overall heat exchange effect of the heat exchange medium on the stator core and the motor stator. In some alternative embodiments, the depth directions of the first notch 13 and the second notch 14 may also be inclined to the radial direction of the stator core at the corresponding positions, so as 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 thus improve the heat exchange effect between the heat exchange medium and the region of the first core portion 1 where the radial channel is provided.

[0026] like Figures 2-4 As shown, in this embodiment, a channel notch 12 communicating with the first notch 13 is provided on the outer edge of the first lamination. The opening of the channel notch 12 is arranged radially outward along the stator core. In two adjacent first laminations in the axial direction of the stator core, the channel notch 12 on one first lamination and the two channel notches 12 adjacent to each other in the circumferential direction of the first lamination on the other first lamination at least partially overlap in the axial direction of the stator core, so that the channel notches 12 on the two first laminations are alternately connected in the circumferential direction of the stator core as circumferential channels.

[0027] like Figure 1As shown, the circumferential channel is groove-shaped, with its opening facing the outside of the stator core. This allows the heat exchange medium outside the stator core to enter the circumferential channel through the 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 simultaneously in the forward or reverse direction, which facilitates the flow of the heat exchange medium 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, as in this embodiment, the same channel notch 12 is connected to three first notches 13. The connection between the same channel notch 12 and multiple first notches 13 can reduce the number of channel notches 12 and reduce the processing difficulty of the first stamping.

[0029] In this embodiment, a winding notch 15 is provided on the first lamination, and a second notch 14 is connected to the winding notch 15. The winding notches 15 are stacked along the axial direction of the stator core to form at least a portion of the winding slots 4.

[0030] Specifically, in this embodiment, the second core portion 2 includes a plurality of second laminations stacked sequentially along the axis of the stator core. Each second lamination also has a winding notch 15. The winding notches 15 on the second laminations and the winding notches 15 on the first laminations are stacked along the axis of the stator core to form at least a portion of the winding slots 4. On the first and second laminations, adjacent winding notches 15 are interposed to form teeth 16, which are stacked to form the tooth-like structure 7 of the stator core.

[0031] The number of the first laminations can be reasonably selected according to actual needs, such as 2 or 3. Increasing the number of the first laminations is beneficial to increasing the flow cross-sectional area of ​​the circumferential and radial channels. The structural strength of the second laminations is better than that of the first laminations. If the number of the first laminations is reduced, the number of the second laminations can be increased, which is beneficial to improving the overall structural strength of the stator core.

[0032] like Figures 2-4 As shown, in this example, the first lamination has a base portion and a protrusion 11 extending beyond 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 2, forming a channel notch 12. In two adjacent first laminations, the projections of the protrusion 11 of one first lamination and the protrusion 11 of the other first lamination do not intersect in the direction of the stator core axis. That is, in two adjacent first laminations in the direction of the stator core axis, the protrusion 11 of one first lamination and the protrusion 11 of the other first lamination are misaligned with each other. Therefore, on the path of the circumferential channel, that is, in the circumferential direction of the stator core, the protrusion 11 will not block the circumferential channel, maintaining the flow of the circumferential channel.

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

[0034] Meanwhile, the outer diameter of the first lamination at the protrusion 11 is the same as the overall outer diameter of the second core portion 2, which helps maintain the consistency of the stator core and the outer circumference of the motor stator. This facilitates the installation of the motor stator when it is installed inside the motor housing. The protrusion 11 fits with the inner wall of the housing, which helps increase the support of the motor stator for the housing and also increases 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 laminations, which are stacked sequentially along the axis of the stator core. In some alternative embodiments, the second laminations, the first laminations, and the second laminations and the first laminations can be connected by an adhesive bonding process. In other alternative embodiments, the second laminations, the first laminations, and the second laminations and the first laminations can be connected by a welding process.

[0036] When the connection is made by welding, a first welding groove extending along the axis of the stator core is provided on the outer peripheral surface of the second core part 2. The first welding groove penetrates the second core part 2. The protrusion 11 of the first lamination adjacent to the second core part 2 is provided corresponding to the first welding groove, and 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 lamination. After the second core portions 2 are stacked sequentially, the first welding notch stacks to form a first welding groove. After the stator core is welded, the first welding groove forms a first weld 21, which penetrates the second core portion 2 and connects each of the second laminations of the second core portion 2. Due to processing limitations, the first weld 21 is difficult to completely block the first welding groove. After the cooling oil and other heat exchange media enter the circumferential channel, they are prone to leaking from the first weld 21, which can easily lead to a decrease in pressure. The cooling oil and other heat exchange media cannot flow completely along 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 sealing effect on the first welding groove. This helps to prevent the cooling oil and other heat exchange media from leaking from the first weld 21 after entering the circumferential channel, thereby helping to maintain oil pressure and allowing the cooling oil and other heat exchange media to flow along the designed path.

[0038] like Figure 3 , Figure 4 As shown, in the first core portion 1 of this embodiment, the included angle between the protruding directions of two adjacent protrusions 11 in the circumferential direction of the stator core is α. In this embodiment, the included 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 radially in the stator core. α = 360n / s, where n is greater than 1 and less than s / 3, n is a positive integer, and s is the number of teeth 16 or winding notches 15 on the first or second lamination, which is also the number of stator winding slots 4 or tooth structures 7. For example, s can be 36, n can be 3, and the included angle α is 30°. In this embodiment, a second welding notch is also provided on the outer edge of the second lamination adjacent to the first lamination. The radial dimension of the second lamination at the bottom of the second welding notch is the same as the radial dimension of the base of the first lamination. Therefore, the second lamination can form a second weld 22 at the second welding notch. The second weld 22 can extend along the axis of the stator core to the first lamination, thereby connecting the first lamination and the second lamination.

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

[0040] In some embodiments, the projected shapes of each first lamination in the direction of the stator core axis can be different, so that when the first laminations are stacked, the channel notches 12 on adjacent first laminations in the direction of the stator core axis are staggered, thereby making the channel grooves on adjacent first laminations alternately connected in the circumferential direction of the stator core to form circumferential channels. At the same time, the winding notches 15 on the first laminations correspond to form winding slots 4.

[0041] In this embodiment, each first lamination has the same shape projected onto the stator core axis. Adjacent first laminations are rotated by a certain angle, such that in two adjacent first laminations along the stator core axis, the channel notch 12 on one first lamination can overlap with two adjacent channel notches 12 on another adjacent first lamination. After rotation, two adjacent channel notches 12 on the same first lamination can communicate with each other through the channel notch 12 on another first lamination.

[0042] Since each first lamination has the same shape projected onto the stator core axis, all first laminations can be processed using the same equipment, which helps to reduce the types of laminations and reduce equipment costs. The rotation angle between two adjacent first laminations is an integer multiple of the angle between the opening directions of two adjacent channel notches 12 on the first lamination, so that after rotation between two adjacent first laminations, the winding notches 15 of the two adjacent first laminations can still be aligned.

[0043] This embodiment also provides a motor stator, including a stator core as described in any of the above embodiments. Winding conductors 5 are disposed within the winding slots 4 of the stator core. The winding conductors 5 are the portion of the motor stator winding coil disposed within the winding slots 4. An insulating structure is provided on a portion of the outer surface of the winding conductors 5. An installation gap exists between the winding conductors 5 and the sidewalls of the winding slots 4. The insulating structure includes a first portion 61 located within the installation gaps on both sides of the winding conductors 5. The first portion 61 cooperates with the winding conductors 5 to form a sealing structure. The sealing structure seals the opening of the winding slots 4 to form an axial channel communicating along the motor stator axis. The sealing structure can constrain the flow path of the heat exchange medium within the winding slots 4, preventing the heat exchange medium from accidentally flowing out of its designed path during flow.

[0044] In this embodiment, the insulation structure further includes at least two second portions 62, which are located at both ends of the winding slot 4. The second portions 62 are arranged around the winding conductor 5 to block both ends of the axial channel. The stator core includes a third core portion 3 located at the end of the stator core. The third core portion 3 has an oil spray hole 30, which is arranged corresponding to the portion of the winding conductor 5 exposed in the stator core. The oil spray hole 30 communicates with the axial channel between the two second portions 62.

[0045] In some embodiments, the insulation structure may be a mounting bracket. For example...Figure 5 and Figure 6 As shown, in this embodiment, the insulation structure is insulating paper 6, which covers the outer surface of the winding conductor 5. The insulating paper 6 has a hollowed-out area in the middle. A first part 61 is located near the internal area of ​​the motor stator relative to the hollowed-out area, and two second parts 62 are located on either side of the hollowed-out area along the motor stator axis. Cooling oil and other heat exchange media can flow within the hollowed-out area. The insulating paper 6 has advantages such as simple structure and low cost. In this embodiment, the insulating paper 6 is foamed insulating paper, which can improve the sealing effect of the sealing structure.

[0046] like Figure 7 As shown, in this embodiment, the third core portion 3 includes a plurality of third laminations stacked sequentially along the stator axis of the motor. Each third lamination also has a winding notch 15 and an oil injection notch 31 located at the bottom of the winding notch 15. The opening of the oil injection notch 31 faces the interior of the stator core and communicates with the winding notch 15. Figure 6 As shown, the various oil injection notches 31 are stacked to form oil injection holes 30. In this embodiment, the projection of the oil injection hole 30 in the radial direction of the motor stator at least partially overlaps with the hollow area in the middle of the insulating paper 6, thereby allowing the oil injection hole 30 to communicate with the axial channel, and heat exchange medium such as cooling oil can enter the oil injection hole 30 from the axial channel. In this embodiment, the oil injection hole 30 is positioned towards the portion of the winding coil exposed in the winding slot 4, so as to guide the cooling oil to the portion of the winding coil exposed in the winding slot 4, thereby cooling that portion.

[0047] This embodiment provides a motor, including a stator core as described in any of the above claims or a motor stator as described in any of the above claims. For example... Figure 9 As shown, Figure 9 The thick solid arrows indicate the flow path of the heat exchange medium. In this embodiment, the motor also includes a housing 8, on which an oil inlet 81 is provided. The oil inlet 81 is positioned in the axial direction of the motor corresponding to the circumferential channel 9 of the stator core, that is, the height of the oil inlet 81 in the axial direction of the motor is the same as the height of the circumferential channel 9 in the axial direction of the motor. After the cooling oil and other heat exchange medium enter the housing 8 through the oil inlet 81, it can enter the circumferential channel 9, and then enter the winding slot 4, that is, the axial channel 10, through the radial channel of the first core part 1, thereby directly cooling the winding coil of the motor stator.

[0048] In summary, this embodiment provides a stator core, a motor stator, and a motor. The stator core includes first laminations stacked sequentially along the stator core axis. Each first lamination has a first notch and a second notch. The opening of the first notch communicates with the circumferential channel 9, and the second notch communicates with the winding slot. Simultaneously, along the axial direction of the motor stator, in two adjacent first laminations, the projections of the first notch on one first lamination and the second notch on the other first lamination along the axial direction of the motor stator at least partially intersect. That is, the first and second notches can communicate through their overlapping projections, thereby connecting the circumferential channel with the winding slot. Medium such as cooling oil can enter the winding slot through the circumferential channel, the first notch, and the second notch, directly contacting structures such as the winding coil within the winding slot for direct cooling, which improves cooling efficiency.

[0049] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0050] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

Claims

1. A stator core, characterized in that, It includes a first iron core portion, which includes at least two first laminations, and the at least two first laminations are stacked sequentially along the axial direction of the stator iron core. The first lamination has a first notch, the opening of the first notch is arranged radially toward the outside of the stator core, a circumferential channel is arranged on the outer circumferential surface of the stator core, the circumferential channel extends circumferentially along the stator core, and the opening of the first notch communicates with the circumferential channel. The first lamination is also provided with a second notch, the opening of the second notch is provided in the radial direction of the stator core toward the interior of the stator core, and a winding slot is provided on the inner circumferential surface of the stator core extending along the axis of the stator core, and the opening of the second notch communicates with the winding slot. In particular, among two adjacent first laminations in the axial direction of the stator core, the projections of a first notch on one first lamination and a second notch on the other first lamination in the axial direction of the stator core at least partially intersect.

2. The stator core according to claim 1, characterized in that, The outer edge of the first lamination is provided with a channel notch that communicates with the first notch. The opening of the channel notch is arranged radially outward along the stator core. In two first laminations that are adjacent in the axial direction of the stator core, the channel notch on one first lamination and the two channel notches on the other first lamination that are adjacent in the circumferential direction of the first lamination overlap at least partially in the projection of the first laminations in the axial direction of the stator core, so that the channel notches on the two first laminations alternately communicate 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 lamination has a winding notch, and each of the winding notches is stacked along the axial direction of the stator core to form at least part of the winding slot. The second notch is connected to the winding notch.

4. The stator core according to claim 3, characterized in that, It also includes a second core portion, which includes a plurality of second laminations stacked sequentially along the axis of the stator core. The second laminations are also provided with the winding notches. The winding notches on the second laminations and the winding notches on the first laminations are stacked along the axis 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 further includes a second core portion. The first lamination has a base portion and a protrusion extending beyond 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. In two adjacent first laminations along the axial direction of the stator core, the projections of the protrusions of one first lamination and the protrusions of the other first lamination in the axial direction of the stator core do not intersect.

6. The stator core according to claim 5, characterized in that, The second core portion includes a plurality of second laminations, which are stacked sequentially along the axis of the stator core. A first welding groove extending along the axis of the stator core is provided on the outer peripheral surface of the second core portion. The first welding groove penetrates the second core portion. The protrusion of the first lamination adjacent to the second core portion corresponds 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 includes the stator core as described in any one of claims 1 to 6, wherein a winding conductor is disposed in the winding slot of the stator core, an insulating structure is disposed on a portion of the outer surface of the winding conductor, and an installation gap is provided between the winding conductor and the side wall of the winding slot. The insulating structure includes a first portion located in the installation gap on both sides of the winding conductor, the first portion cooperating with the winding conductor to form a sealing structure, and the sealing structure sealing the slot opening of the winding slot to form an axial channel communicating along the axial direction of the motor stator.

8. The motor stator according to claim 7, characterized in that, The insulation structure further includes at least two second parts, which are respectively located at both ends of the winding slot. The second parts are arranged around the winding conductor to block both 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 spray hole, which is arranged corresponding to the portion of the winding conductor exposed in the stator core. The oil spray hole communicates with the axial channel between the two second parts.

9. The motor stator according to claim 8, characterized in that, The third core portion includes a plurality of third laminations stacked sequentially along the direction of the motor stator axis. The third laminations are also provided with the winding notch. The third laminations are also provided with an oil injection notch located at the bottom of the winding notch. The opening of the oil injection notch faces the interior of the stator core and communicates with the winding notch. Each of the oil injection notches is stacked to form the oil injection hole.

10. An electric motor, characterized in that, It includes the stator core as described in any one of claims 1 to 6 or the motor stator as described in any one of claims 7 to 9.

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