Stator core and motor comprising same

Abstract

The utility model provides a stator core and a motor comprising the same. The stator core comprises a first part and two second parts. The first part is provided with a spiral oil duct extending along the axial direction of the stator core; the second part comprises a plurality of laminated second stator punching sheet sections, and each second stator punching sheet section is provided with a second center hole and a second annular wall; a plurality of spraying holes are formed in the multiple overlaid second annular walls of the projection part of the second part at the joint of the spiral oil duct and the second part, and the spraying holes penetrate through the second annular walls; the plurality of spray holes of the second stator punching sheet section are communicated with the plurality of spray holes of the second stator punching sheet section on the adjacent layer, the communicated spray holes are communicated with the spiral oil channel, and the distance between the spray holes in the second stator punching sheet section and the center of the second center hole is reduced as the second stator punching sheet section is far away from the first part. The cooling efficiency of the oil duct of the stator core is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and more specifically, to a stator core and a motor including the same. Background Art

[0002] With the development of electric vehicles, the demand for miniaturization of motors in their powertrains is increasing day by day. Correspondingly, the power density of motors has also been improved. With the improvement of power density, the heat dissipation efficiency of motors has become a technical problem to be solved urgently.

[0003] In the existing technology, motors usually use water-cooled heat dissipation technology for heat dissipation. However, the power density of water-cooled heat dissipation is low. Also, since the cooling water has no insulation property and cannot be directly in contact with motor components, the thermal resistance of the water-cooling link is large. In addition, the water-cooling technology has high requirements for the structural accuracy of motor components, and the oil-cooled heat dissipation technology for motors is an alternative technical solution.

[0004] Currently, the mainstream oil-cooled motor stator adopts the form of axial oil ducts plus end oil spraying / blocking / guiding rings. The oil spraying ring can collect the oil sprayed from the axial oil ducts in the space surrounded by the oil spraying ring and the inner wall of the electric drive assembly housing, and then spray the oil from the holes in the wall of the oil spraying ring onto the winding ends to play a cooling role.

[0005] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present utility model. Therefore, it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0006] Aiming at the problems in the existing technology, the purpose of the present utility model is to provide a stator core and a motor including the same. The spray holes on the annular walls of multiple stacked stator punching segments at both ends of the stator core form a centripetal oil spraying channel, which improves the cooling efficiency and simplifies the assembly process of the drive motor assembly.

[0007] The first aspect of the present utility model provides a stator core, including a first part and two second parts at both ends of the first part;

[0008] The first part is provided with a spiral oil duct extending along the axial direction of the stator core;

[0009] The second part includes multiple stacked second stator punching segments, and the second stator punching segments have a second central hole and a second annular wall;

[0010] Multiple stacked second annular walls at the projection part of the connection between the spiral oil duct and the second part are all provided with multiple spray holes, and the spray holes penetrate through the second annular wall;

[0011] The plurality of the spray holes of the second stator punching segment communicate with the plurality of the spray holes of the second stator punching segment of the adjacent layer. The communicated spray holes communicate with the spiral oil passage, and as the second stator punching segment is away from the first part, the distance between the spray holes thereon and the center of the second central hole becomes smaller.

[0012] According to the first aspect of the present invention, the first part includes a plurality of stacked first stator punching segments;

[0013] The first stator punching segment has a first central hole and a first annular wall, and an arc-shaped groove along the circumferential direction is arranged on the outer periphery of the first annular wall;

[0014] The projection of the arc-shaped groove of the first stator punching segment on the plane perpendicular to the axis of the stator core at least partially coincides with the projection of the arc-shaped groove of the first stator punching segment of the adjacent layer on the plane perpendicular to the axis of the stator core;

[0015] The arc-shaped grooves of the plurality of the first stator punching segments communicate with each other and form a spiral oil passage extending along the axial direction of the stator core.

[0016] According to the first aspect of the present invention, a plurality of through holes penetrating the first annular wall are arranged on the outer periphery of the first annular wall except the arc-shaped groove;

[0017] According to the first aspect of the present invention, the radial width of the arc-shaped groove is 2.25 mm ± 0.25 mm.

[0018] According to the first aspect of the present invention, the plurality of the through holes of the first stator punching segment communicate with the plurality of the through holes of the first stator punching segment of the adjacent layer.

[0019] According to the first aspect of the present invention, the axis of the through hole is parallel to the axis of the stator core; and / or

[0020] The axis of the spray hole is parallel to the axis of the stator core.

[0021] According to the first aspect of the present invention, the projection of the through hole on the plane perpendicular to the axis of the stator core is circular, elliptical or polygonal; and / or

[0022] The projection of the spray hole on the plane perpendicular to the axis of the stator core is circular, elliptical or polygonal.

[0023] According to the first aspect of the present invention, the arc center angles corresponding to adjacent through holes are equal; and / or

[0024] The arc center angles corresponding to adjacent spray holes are equal.

[0025] According to the first aspect of the present utility model, the central angle corresponding to two adjacent through holes is θ, and the central angle corresponding to the spray hole is α, satisfying:

[0026] α < θ.

[0027] According to the first aspect of the present utility model, the projection of the spray hole on the plane perpendicular to the axis of the stator core does not coincide with the projection of the through hole on the plane perpendicular to the axis of the stator core.

[0028] According to the first aspect of the present utility model, the central angle corresponding to two adjacent through holes is θ, and the central angle corresponding to two adjacent spray holes is φ, satisfying:

[0029] θ < φ.

[0030] According to the first aspect of the present utility model, the central angle corresponding to the arc-shaped groove is β, and the central angle β is equal to 360° / m;

[0031] The second part includes n second stator punching segments, where n is an integer greater than m.

[0032] According to the first aspect of the present utility model, the second stator punching segments are evenly divided into n parts, each part is provided with a plurality of spray holes, and along a rotation direction, the distances between the spray holes in different parts and the center of the second central hole gradually decrease or gradually increase.

[0033] According to the first aspect of the present utility model, the difference in the distances between the spray holes of two adjacent second stator punching segments and the center of the second central hole is R0; the height of the spray hole in the radial direction is H, satisfying: R0 < H.

[0034] The second aspect of the present utility model provides a motor, including the stator core described above.

[0035] The stator core of the present utility model does not need to be provided with an oil spraying ring. Through the spray holes provided on the annular walls of a plurality of stacked stator punching segments at both ends, the spray holes are communicated with the spiral oil channels and are inclined towards the axis of the stator core, realizing centripetal oil spraying on the end face of the stator core, achieving the purpose of cooling the end part of the stator winding of the motor, reducing the material cost and simplifying the assembly process of the drive motor assembly at the same time. Description of the Drawings

[0036] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present utility model will become more obvious.

[0037] Figure 1 It is a schematic structural diagram of the stator core of an embodiment of the present utility model;

[0038] Figure 2 It isFigure 1 Exploded view of the stator core;

[0039] Figure 3 Schematic structural diagram of the first stator punching segment of the first embodiment of the present utility model;

[0040] Figure 4 Schematic structural diagram of the second stator punching segment of the first embodiment of the present utility model;

[0041] Figure 5 Cross-sectional view of the second part II of the first embodiment of the present utility model;

[0042] Figure 6 Schematic structural diagram of the second stator punching segment of the second embodiment of the present utility model;

[0043] Figure 7 Cross-sectional view of the stator core of the second embodiment of the present utility model;

[0044] Figure 8 is Figure 7 Enlarged view at position B of;

[0045] Figure 9 is Figure 2 Enlarged view of the dashed box; and

[0046] Figure 10 Schematic structural diagram of the oil passage of the motor of an embodiment of the present utility model. Detailed implementation manners

[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this utility model will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining this utility model and should not be construed as limiting this utility model. Identical reference numerals in the figures denote identical or similar structures, and thus their repeated description will be omitted.

[0048] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0049] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a connection capable of mutual communication; it may be a direct connection, or an indirect connection through an intermediate medium, and may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0050] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0051] To overcome the above technical problems, the present utility model provides a stator core and a motor including the same. The stator core includes a first part and two second parts at both ends of the first part; the first part is provided with a spiral oil passage extending along the axial direction of the stator core; the second part includes a plurality of stacked second stator punching segments, and the second stator punching segment has a second central hole and a second annular wall; a plurality of spray holes are provided on the plurality of stacked second annular walls of the projection part of the connection between the spiral oil passage and the second part, and the spray holes penetrate through the second annular wall; the plurality of spray holes of the second stator punching segment communicate with the plurality of spray holes of the second stator punching segment of the adjacent layer, and as the second stator punching segment is away from the first part, the distance between the spray hole on it and the center of the second central hole becomes smaller.

[0052] The stator core of the present utility model does not need to be provided with an oil spraying ring. Through the spray holes provided on the annular walls of the plurality of stacked stator punching segments at both ends, the spray holes communicate with the spiral oil passage and are inclined towards the axis of the stator core, realizing centripetal oil spraying on the end face of the stator core, achieving the purpose of cooling the end part of the stator winding of the motor, reducing the material cost, and simplifying the assembly process of the drive motor assembly at the same time.

[0053] The following further elaborates the structure of the stator core of the present utility model and the motor including the same in conjunction with the accompanying drawings and specific embodiments. It can be understood that each specific embodiment does not limit the protection scope of the present utility model.

[0054] Figure 1 and Figure 2 are respectively a structural schematic diagram and an exploded view of a stator core according to an embodiment of the present utility model; specifically, the stator core includes a first part I and two second parts II at both ends of the first part I.

[0055] The first part I can be formed by laminating a plurality of first stator punching segments, and the first part I is provided with a spiral oil passage extending along the axial direction of the stator core. Figure 3 is a structural schematic diagram of a first stator punching segment 1a according to the first embodiment of the present utility model. The first stator punching segment 1a has a first central hole 11 and a first annular wall 12. An arc-shaped groove 122 is provided on the outer periphery of the first annular wall 12 along the circumferential direction; the arc-shaped groove 122 can be formed by cutting an arc-shaped part from the outer periphery of the first annular wall 12. The arc width of the arc-shaped groove 122 is consistent in the circumferential direction, that is, the outer arc and the inner arc of the arc-shaped groove 122 are concentric arcs, and the central angles subtended by the outer arc and the inner arc are the same. The central angle corresponding to the arc-shaped groove 122 is β. The size and radial width of the central angle of the arc-shaped groove 122 can be determined according to the depth required for the oil passage formed after being assembled with the inner wall of the motor housing. Preferably, the radial width of the arc-shaped groove is 2.25 mm ± 0.25 mm, and here the radial width is the difference between the outer arc radius and the inner arc radius of the arc-shaped groove 122.

[0056] When the above-mentioned plurality of first stator punching segments are laminated, two adjacent first stator punching segments are arranged to rotate relative to each other, as shown in Figure 2 the exploded view of the plurality of first stator punching segments. The arc-shaped grooves 122 of two adjacent first stator punching segments are not completely overlapped, but the projection of the arc-shaped groove 122 of the first stator punching segment 1 on a plane perpendicular to the axis (dot-dashed line) of the stator core at least partially coincides with the projection of the arc-shaped groove of the adjacent first stator punching segment on a plane perpendicular to the axis of the stator core; the above setting ensures that the two arc-shaped grooves 122 of two adjacent first stator punching segments can be connected or in other words, the two arc-shaped grooves 122 are communicated. Thus, when the oil passage is formed by assembling the two arc-shaped grooves 122 with the inner wall of the motor housing, the oil passage segments corresponding to the two arc-shaped grooves 122 are communicated. For details, reference can be made to Figure 2 the first stator punching segment 1a, the first stator punching segment 1b, the first stator punching segment 1c and the first stator punching segment 1d, Figure 2 The first part I shown in

[0057] The second part II includes a plurality of stacked second stator punching segments. For Figure 2 example, the second part II includes three second stator punching segments. From the one close to the first part I to the one far from the first part I, the second stator punching segments 2a, 2b, and 2c are stacked in sequence. Figure 4 It is a schematic structural diagram of the second stator punching segment of the first embodiment of the present utility model. The second stator punching segment 2a has a second central hole 21 and a second annular wall 22. The second central hole 21 is adapted to the structure of the first central hole 11. It should be noted that the first stator punching segment and the second stator punching segment herein can be respectively formed by stacking a plurality of stator punching sheets with the same structure. At the same time, both the first stator punching segment and the second stator punching segment are provided with a plurality of stator slots. The number / structure of the stator slots of the first stator punching segment is adapted to the number / structure of the stator slots of the second stator punching segment. The stator slots of the plurality of first stator punching segments and the plurality of second stator punching segments of the entire stator core completely overlap.

[0058] At the connection between the spiral oil passage and the second part II, a plurality of spray holes 221a are provided on the plurality of stacked second annular walls in the projection part of the second part. The spray holes 221a penetrate through the second annular wall 22. The axis of the spray hole 221a is parallel to the axis of the stator core. The axis perpendicular to the spray hole 221a of the second stator punching segment is easier to process than an inclined hole. Still taking Figure 2 as an example, the projection of the connection between the spiral oil passage and the second part II on the second part II is the projection of the arc-shaped groove 122 of the first stator punching segment 1a on the second part II. If the central angle corresponding to the arc-shaped groove 122 is β, then a plurality of spray holes 221a are provided on the second annular wall 22 corresponding to the central angle β' (β' ≤ β) of the second stator punching segment. At the same time, the plurality of spray holes of the second stator punching segment communicate with the plurality of spray holes of the adjacent-layer second stator punching segment. The communicated spray holes communicate with the spiral oil passage, and as the second stator punching segment moves away from the first part, the distance between the spray holes on it and the center of the second central hole becomes smaller.

[0059] Figure 5A cross-sectional view of the second part II of the first embodiment of the present utility model. The second part II includes second stator punching segments 2a, 2b, and 2c stacked in sequence. On the second annular wall 22 corresponding to the β' arc central angle of each of the above-mentioned second stator punching segments, a plurality of spray holes 221a, a plurality of spray holes 221b (not shown in the figure), and a plurality of spray holes 221c (not shown in the figure) are respectively provided. The projections of the spray holes 221a, 221b, and 221c on a plane perpendicular to the axis of the stator core can be circular, elliptical, polygonal, etc. One spray hole 221a, one spray hole 221b, and one spray hole 221c are connected. At the same time, in order to make the channels formed by adjacent spray holes tilt towards the axis of the stator core at both ends, the distances between the spray holes 221a, 221b, and 221c and the center of the second central hole decrease in sequence. That is, the radial positions of each group of spray holes corresponding to each part on the second stator punching segment are different. The shapes and sizes of the spray holes 221a, 221b, and 221c can be different, but when they are stacked, the spray holes of adjacent layers need to overlap to form connected channels. For example, the distances between the spray holes 221A, 221B, and 221C and the center of the second central hole 21 are R1, R2, and R3 respectively. R1, R2, and R3 can be an arithmetic sequence, and the difference in the distances between the spray holes of adjacent two second stator punching segments and the center of the second central hole is R0. The height of the spray hole in the radial direction is H. If R0 < H, then partial overlap of the spray holes of adjacent layers can form connected channels. At the same time, for simple design and uniformity of channel distribution, the arc central angles corresponding to adjacent two spray holes can be designed to be equal.

[0060] In some other embodiments, the second stator punching segment is divided into n parts along the circumferential direction, and n can be an integer greater than 1. Figure 6 A structural schematic diagram of the second stator punching segment of the second embodiment of the present utility model. Among them, n is 3, that is, along a rotation direction, the circumferential direction of the second stator punching segment 2 is divided into three parts: 2I / 2II / 2III. Spray holes 221A, 221B, and 221C are respectively arranged in the three parts of 2I / 2II / 2III, and the distances between the spray holes 221A, 221B, and 221C and the center of the second central hole 21 gradually decrease. In Figure 4 In the embodiment of, the second stator punching segments 2a, 2b, and 2c have different structures because the distances between the spray holes on them and the center of the second central hole are different. Therefore, they need to be prepared three times, but Figure 6 In the embodiment of, only by rotating the plurality of second stator punching segments 2 by a certain angle, the cross-section as shown in Figure 5 The second part II of the structure can be obtained. Figure 7The sectional view of the stator core of the second embodiment of the present utility model, where the section at point A can be seen Figure 5 , and the section at point B can be seen Figure 8 . Along the direction from the first part I to the second part II at point B, there are injection holes 221C, injection hole 221A, and injection hole 221B in sequence. Since the spiral oil passage at point B is not connected to the first part I, the position of the injection holes (invalid injection holes) at this place does not affect the flow direction of the cooling oil. Of course, in some other embodiments, the distances between the injection holes 221A, injection hole 221B, and injection hole 221C and the center of the second central hole 21 gradually increase. The difference is that the second part II with the structure as shown in Figure 5 , and the relative rotation directions of the multiple second stator punching segments 2 are different. As can be seen from above, preferably, the second part II may include n second stator punching segments.

[0061] When the multiple injection holes of the multiple second stator punching segments are connected and at the same time connected to the spiral oil passage, that is, if the radius of the arc-shaped groove at the arc-shaped groove of the first stator punching segment 1a is Ry, and the radius of the injection hole 221a of the second stator punching segment 2a is R1 (the distance from the edge of the injection hole 221a closest to the center of the second central hole to the center of the second central hole), then the sum of R1 and the injection hole height H should be greater than Ry. Theoretically, R1 can be greater than, equal to, or less than Ry. Preferably, R1 is equal to or less than Ry. For example, in the embodiment as shown in Figure 5 , R1 is less than Ry. At this time, the cold oil can directly enter the injection hole 221a of the second stator punching segment 2a from the arc-shaped groove of the first stator punching segment 1a. The thicknesses of the second stator punching segment 2a, the second stator punching segment 2b, and the second stator punching segment 2c are C, D, and E respectively. The thicknesses C and D can be the same, and the thickness E is adjustable. The stator punching sheet is generally a silicon steel sheet. Correspondingly, C, D, and E can be integer multiples of a single silicon steel sheet. When the difference in the distances between the injection holes of two adjacent second stator punching segments and the center of the second central hole is R0, and the thicknesses of the second stator punching segment 2a, the second stator punching segment 2b, and the second stator punching segment 2c are the same, the centers of the injection hole 221a, the injection hole 221b, and the injection hole 221c are on the same straight line, and the angle between this straight line and the axis of the stator core is the estimated injection angle. If R0 becomes smaller, then the estimated injection angle becomes smaller accordingly. On the contrary, the estimated injection angle becomes larger, and the injection angle tends to be more centripetal and oblique. If the thicknesses C, D, and E increase in equal proportion, then the estimated injection angle also becomes smaller accordingly. On the contrary, the estimated injection angle becomes larger, and the injection angle tends to be more centripetal and oblique. However, the change in C, D, and E has a smaller impact on the estimated injection angle than the change in R0.

[0062] Since the part of the second stator punching segment 2a where multiple spray holes 221A are provided corresponds to the part of the arc-shaped groove 122 of the first stator punching segment 1a, the arc center angle β' can be the same as the arc center angle β. For example, the arc center angle corresponding to the arc-shaped groove 122 is β, the arc center angle β is equal to 360° / m, and the arc center angle β' is 360° / n. Since the arc center angle β' needs to be less than or equal to the arc center angle β, m may not be an integer, but m needs to be less than n.

[0063] In the above embodiment, the spiral oil passage formed by connecting multiple arc-shaped grooves 122 of the first part I along the axial direction of the stator core can play a role in cooling the motor. To further improve the cooling effect of the oil passage, in some embodiments, multiple through holes 121 penetrating the first annular wall 12 are provided on the outer periphery of the first annular wall 12 except for the arc-shaped groove 122. The projection of the through hole 121 on the plane perpendicular to the axis of the stator core can be in shapes such as circular, elliptical or polygonal. The multiple through holes of the first stator punching segment communicate with the multiple through holes of the first stator punching segment of the adjacent layer. The axis of the through hole is parallel to the axis of the stator core. The shape and number of the through holes 121 can be set according to the specific structure of the stator core and are not limited here. Preferably, the arc center angles corresponding to two adjacent through holes 121 are equal, and the uniformly distributed through holes 121 can improve the uniformity of motor cooling and reduce the probability of local heating of the motor.

[0064] The overall pressure drop of the stator oil circuit system from the oil inlet to the oil outlet is generally about 200 mbar. A large number of spray holes results in a small oil circuit pressure, and it is difficult to ensure the spray hole flow rate, which will prevent the jet flow from reaching the specified cooling part. A small number of spray holes results in a large oil circuit pressure, and a more powerful oil pump is required to maintain the pressure, leading to an increase in cost, volume and weight. To solve the above problems, the present utility model further limits the number of spray holes. Figure 9 For Figure 2 In the enlarged view at the dashed box, the arc center angle corresponding to two adjacent through holes 121 is θ, the arc center angle corresponding to the spray hole 221a is α, and the arc center angle corresponding to two adjacent spray holes is φ, satisfying: α < θ, θ < φ. That is to say, within the same arc center angle, the number of through holes provided in the first stator punching segment is greater than the number of spray holes provided in the second stator punching segment.

[0065] If 2α < θ, theoretically, two spray holes can be arranged between two adjacent through holes 121, or the central angle (width) of the spray holes can be enlarged by two times or more. The specific quantity depends on the calculation result of the fluid pressure. Preferably, the projection of the spray holes on the plane perpendicular to the axis of the stator core does not coincide with the projection of the through holes on the plane perpendicular to the axis of the stator core. Herein, the spray holes refer to the spray holes communicated with the spiral oil passage, and the through holes refer to the through holes at the nearest first stator punching segment corresponding to the projection of the second stator punching segment where the spray holes are arranged. That is, one spray hole can be arranged between every two adjacent through holes, or one spray hole can be arranged every 1, 2,... θ. Figure 9 In [the figure], there is an embodiment where one spray hole is arranged every 4θ.

[0066] In addition, the number of rotation segments (the value of n) adopted by the second stator punching segment of the present utility model and the central angle corresponding to the arc-shaped groove arranged on the first annular wall (yoke part) of the first stator punching segment can be determined according to the structure of the stator core to be obtained. For example, if the second stator punching segment adopts a two-segment rotation, that is, when n is 2, the central angle occupied by a single group of spray holes is in the range of 180°, and the step of the spray port is a two-segment step. It is difficult to limit the jet angle of the spray port, and the central angle corresponding to the arc-shaped groove arranged on the first annular wall (yoke part) of the first stator punching segment also needs to be increased to 180°, which may have a greater impact on the electromagnetic performance.

[0067] If the second stator punching segment adopts a four-segment rotation, that is, when n is 2, the central angle occupied by a single group of spray holes is in the range of 90°, and the step of the spray port is a four-segment step. It is a bit excessive for limiting the jet angle of the spray port, and the central angle corresponding to the arc-shaped groove arranged on the first annular wall (yoke part) of the first stator punching segment also needs to be reduced to 90°, and the number of segments for forming the spiral oil passage by rotation needs to be increased. For example, if the central angle corresponding to the arc-shaped groove is 120° and the central angle of each group of spray holes is set to 90°, 4 segments of rotation are required for one full circle. If the central angle corresponding to the arc-shaped groove is 90° and the central angle of each group of spray holes is set to 60°, then 6 segments of rotation are required for one full circle. If the thickness of one full segment of the rotating stator punching segment is kept the same, the 6-segment spiral oil passage is narrower, the heat dissipation area is reduced, and the pressure drop is increased, which is not conducive to the heat dissipation of the oil passage. The thickness of the second part II, that is, the number of second stator punching segments it includes or the number of segments (n) of each second stator punching segment can be set according to the total thickness of the stator core. If the total thickness of the stator core is 120 mm, it can include two second stator punching segments with 6-segment rotation, then the thickness of each second stator punching segment is 10 mm; if the total thickness of the stator core is 60 mm, then n is equal to 6, and the spiral oil passage corresponding to the second stator punching segment will become narrower, that is, n of the second stator punching segment needs to be less than 6.

[0068] For Figure 6For the second stator punching segment of the embodiment, the above parameters are all on the second stator punching segment. The spray holes 221A, 221B, and 221C are continuously distributed in different regions on the circumference. Through angular rotation, a ramped stepped oil passage with a combination of R1, R2, and R3 from the inside to the outside is formed within a 120° region above the stator core. The oil passages in other regions are turning-shaped stepped non-oil-passing oil passages (as Figure 8 shown).

[0069] However, when the difference (2R0) between R1 and R3 is greater than the height H of the spray hole, the oil passages of the other spray holes except the 120° region directly above are naturally closed. Even when the spray hole faces the through hole, that is, when the spray hole φ does not fully fall within the central angle θ of the arc between two adjacent through holes, the oil passage is also blocked.

[0070] The present invention also provides a motor including the above stator core. When the stator core of the present invention is applied to a motor, it usually further includes a cylindrical housing (not shown in the figure). The stator core is disposed within the housing; the housing is provided with a through oil inlet 9, Figure 10 which is a schematic structural diagram of the oil passage of the motor according to an embodiment of the present invention. One end of the oil inlet 9 is connected to the spiral oil passage, and the other end is used to connect to an external oil supply pipe. In practice, when the values of the thickness C, thickness D, thickness E of the second stator punching segment, R1 of the spray hole 221a, R2 of the spray hole 221b, and R3 of the spray hole 221c are all determined, if the pressure drop is too large, the height H of the spray hole can be increased to enlarge the channel formed by the spray holes, thereby reducing the pressure drop. When the values of the thickness C, thickness D, thickness E of the second stator punching segment, R1 of the spray hole 221a, R2 of the spray hole 221b, and R3 of the spray hole 221c are all determined, if the coverage area of the sprayed cooling oil on the winding is not large enough, the width of the spray hole (increasing the central angle φ corresponding to the spray hole) can be increased to increase the coverage range. When the values of R1 of the spray hole 221a, R2 of the spray hole 221b, R3 of the spray hole 221c, the width (central angle φ corresponding to the spray hole) of the spray holes 221a, 221b, and 221c, and the height (H) of each spray hole of the second stator punching segment are all determined, the thicknesses C, D, and E of the second stator punching segment can be changed to fine-tune the preset spray angle. In the stepped channel composed of multiple layers of spray holes, the impact pressure on the stepped end face is relatively large. It is necessary to use a dispensing or surface gluing process to bond between the stator punching sheets or between the stator punching segments to increase the adhesion and prevent warping of the sheets, thereby causing leakage. When the motor of the present invention operates, the cooling oil enters the spiral oil passage formed by the arc-shaped groove of the stator core and the housing from the external oil supply pipe through the oil inlet, and flows towards both ends of the stator core along the spiral oil passage formed by the arc-shaped groove of the stator core and the housing, as well as the oil passage formed by the through holes 121 of the first stator punching segment and the spray holes 221 of the second stator punching segment, thereby playing a role in cooling the motor.

[0071] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0072] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A stator core, characterized in that: comprising a first portion and two second portions at both ends of the first portion; The first portion is provided with a spiral oil passage extending along the axial direction of the stator core; The second portion includes a plurality of stacked second stator punch segments, the second stator punch segments having a second central hole and a second annular wall; A plurality of overlapping second annular walls at the projection portion of the second part where the spiral oil passage is connected to the second part are each provided with a plurality of spray holes, and the spray holes penetrate through the second annular wall; The multiple spray holes of the second stator punch segment are connected with the multiple spray holes of the second stator punch segment of the adjacent layer, the connected spray holes are connected with the spiral oil passage, and as the second stator punch segment moves away from the first part, the distance between the spray holes thereon and the center of the second center hole becomes smaller.

2. The stator core according to claim 1, characterized in that: The first part includes a plurality of stacked first stator punch segments; The first stator punch segment has a first central hole and a first annular wall, and the outer periphery of the first annular wall is provided with an arc-shaped groove along the circumferential direction; The projection of the arc-shaped groove of the first stator punch segment on a plane perpendicular to the axis of the stator core at least partially overlaps with the projection of the arc-shaped groove of the first stator punch segment of an adjacent layer on a plane perpendicular to the axis of the stator core; The plurality of arc-shaped grooves of the plurality of first stator punch segments are connected to form a spiral oil passage extending along the axial direction of the stator core.

3. The stator core according to claim 2, characterized in that: The outer periphery of the first annular wall except the arc-shaped groove is provided with a plurality of through holes penetrating the first annular wall.

4. The stator core according to claim 2, characterized in that: The radial width of the arc-shaped groove is 2.25 mm±0.25 mm.

5. The stator core according to claim 3, characterized in that: The plurality of through holes of the first stator punch segment are communicated with the plurality of through holes of the first stator punch segment of an adjacent layer.

6. The stator core according to claim 3, characterized in that: The axis of the through hole is parallel to the axis of the stator core; and / or The axis of the spray hole is parallel to the axis of the stator core.

7. The stator core according to claim 3, characterized in that: The projection of the through hole on a plane perpendicular to the axis of the stator core is circular, elliptical or polygonal; and / or The projection of the spray hole on a plane perpendicular to the axis of the stator core is circular, elliptical or polygonal.

8. The stator core according to claim 3, characterized in that: The arc center angles corresponding to adjacent through holes are equal; and / or The arc center angles corresponding to adjacent spray holes are equal.

9. The stator core according to claim 3, characterized in that: The arc center angle corresponding to two adjacent through holes is θ, and the arc center angle corresponding to the spray hole is α, which satisfies: α<θ.

10. The stator core according to claim 3, characterized in that: A projection of the spray hole on a plane perpendicular to the axis of the stator core does not coincide with a projection of the through hole on a plane perpendicular to the axis of the stator core.

11. The stator core according to claim 3, characterized in that: The arc center angles corresponding to the adjacent through holes are θ, and the arc center angles corresponding to the two adjacent nozzle holes are φ, which satisfies: θ<φ.

12. The stator core according to claim 3, characterized in that: The arc center angle corresponding to the arc-shaped groove is β, and the arc center angle β is equal to 360° / m; The second portion includes n second stator punch segments, wherein n is an integer greater than m.

13. The stator core according to claim 12, characterized in that: The second stator punch segment is evenly divided into n parts, each part is provided with a plurality of spray holes, and along a rotation direction, the distances between the spray holes of different parts and the center of the second center hole gradually decrease or increase.

14. The stator core according to claim 12, characterized in that: The difference between the distances between the spray holes of two adjacent second stator punch segments and the second center hole is R0; the height of the spray holes in the radial direction is H, satisfying: R0 <H。 15. A motor, characterized in that: The stator core comprises the stator core as claimed in any one of claims 1 to 14.

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