Stator core, motor heat dissipation structure and motor

Abstract

The utility model discloses a stator iron core, a motor heat dissipation structure and a motor, and relates to the technical field of stator iron cores, the stator iron core comprises a plurality of middle stator punching sheet groups which are stacked along the axial direction, and two same end stator punching sheet groups are configured at the end parts of the middle stator punching sheet groups. Each end part stator punching sheet group comprises a first through hole and a second through hole which are arranged at an interval along the circumferential direction, the distance from the center of the first through hole to the axis of the end part stator punching sheet group is smaller than the distance from the center of the second through hole to the axis of the end part stator punching sheet group, and the second through hole extends along the radial direction of the end part stator punching sheet group; and after two adjacent end part stator punching sheet groups relatively rotate by a preset angle, the terminating end of the second through hole of one end part stator punching sheet group is only at least partially overlapped with the first through hole of the other end part stator punching sheet group to form a via hole, and the axis of the via hole is collinear with the axis of the first through hole. According to the technical scheme of the utility model, the technical problem that the manufacturing cost of the existing stator iron core is relatively high is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of stator cores, and in particular to a stator core, a motor heat dissipation structure and a motor. Background Art

[0002] In modern motor design, efficient heat dissipation is a key factor in ensuring long-term, stable operation, especially for oil-cooled motors used in high-power density applications such as electric vehicles and industrial equipment. Oil-cooled motors are cooled by lubricating oil and offer high efficiency and reliability. In traditional oil-cooled motors, heat dissipation from the stator core is typically achieved through tilted openings arranged at an angle at the ends, requiring the use of punchings with different structures. However, this requirement for different punching structures results in high manufacturing costs. Utility Model Content

[0003] The main purpose of the utility model is to provide a stator core, a motor heat dissipation structure and a motor, aiming to solve the technical problem of high manufacturing cost of the existing stator core.

[0004] To achieve the above-mentioned objectives, an embodiment of the present invention proposes a stator core, wherein the stator core includes a plurality of middle stator punching sheet groups stacked in the axial direction, and two identical end stator punching sheet groups are arranged at the ends of the middle stator punching sheet group, and the end stator punching sheet groups have stator slots uniformly distributed along the circumferential direction, and each of the end stator punching sheet groups includes a first through hole and a second through hole arranged at intervals along the circumferential direction, and the distance from the center of the first through hole to the axis of the end stator punching sheet group is smaller than the distance from the center of the second through hole to the axis of the end stator punching sheet group, and the second through hole extends radially along the end stator punching sheet group. After the two adjacent end stator punching sheet groups are rotated relative to each other by a predetermined angle, the terminal end of the second through hole of one of the end stator punching sheet groups only partially overlaps with the first through hole of the other end stator punching sheet group to form a conducting hole, and the axis of the conducting hole is collinear with the axis of the first through hole.

[0005] In one embodiment, the shortest distance from the first through hole to the axis of the end stator punching group is equal to the distance from the second through hole to the axis of the end stator punching group.

[0006] In one embodiment, the cross-section of the first through hole and / or the second through hole is rectangular.

[0007] In one embodiment, stator teeth are provided on the inner side of the end stator punching group, and the first through hole and / or the second through hole are provided corresponding to the stator teeth.

[0008] In one embodiment, the number of the stator slots is 48, the number of the first through holes is 18, and the predetermined angle is 30 degrees or 60 degrees, or the number of the first through holes is 12 or 24, and the predetermined angle is 22.5 degrees or 45 degrees;

[0009] Alternatively, the number of the stator slots is 54, the number of the first through holes is 9 or 27, and the predetermined angle is 20 degrees or 60 degrees, or the number of the first through holes is 18 and the predetermined angle is 46.6667 degrees;

[0010] Alternatively, the number of the stator slots is 72, the number of the first through holes is 18 and the predetermined angle is 30 degrees, or the number of the first through holes is 12 or 24 and the predetermined angle is 20 degrees or 40 degrees.

[0011] In one embodiment, a plurality of the first through holes and / or the second through holes are provided along a circumferential array of the punching sheet.

[0012] In one embodiment, the diameter of the second through hole decreases gradually in the axial direction.

[0013] In one embodiment, two or more identical end stator sheet groups are respectively disposed at both ends of the middle stator sheet group in the axial direction.

[0014] To achieve the above-mentioned purpose, an embodiment of the present invention proposes a motor heat dissipation structure, which is applied to the motor, wherein the stator core is the stator core described above, and a heat dissipation channel is provided on the middle stator punching group, and the heat dissipation channel only at least partially overlaps with the second through hole of one of the end stator punching groups.

[0015] To achieve the above objectives, an embodiment of the present invention provides a motor, which includes the motor heat dissipation structure described above.

[0016] In a technical solution proposed by the present invention, two identical end stator lamination assemblies are used at the ends of the stator core. Each end stator lamination assembly is provided with a first through-hole and a second through-hole separated from each other. By rotating the two end stator lamination assemblies by a predetermined angle, the locking end of the second through-hole on the first end stator lamination assembly only partially or completely overlaps with the first through-hole on the second end stator lamination assembly. This creates a conductive channel between the two end stator lamination assemblies, allowing cooling oil to flow axially, achieving horizontal spraying of the cooling oil and dissipating heat from the stator core and stator winding. Furthermore, the axis of the conductive hole is collinear with the axis of the first through-hole, allowing the cooling oil to flow along the first through-hole and be sprayed horizontally, directly onto the end stator winding, thereby improving the heat dissipation effect of the end stator winding. The present application achieves horizontal oil spraying by rotating two identical end stator lamination assemblies by a predetermined angle, replacing the complex internal flow channel structure achieved by using different types of laminations. This simplifies the manufacturing process, reduces manufacturing costs, provides greater design flexibility and versatility, and thus achieves better heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 The structure diagram of the end stator punching group in the embodiment of the stator core of the utility model is shown as follows: Figure 1 ;

[0019] Figure 2 The structure diagram of the end stator punching group in the embodiment of the stator core of the utility model is shown as follows: Figure 2 .

[0020] Description of Figure Numbers:

[0021] 1. End stator punching group; 11. First through hole; 12. Second through hole; 2. Stator slot; 3. Stator tooth.

[0022] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the embodiments of the present invention.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, in the embodiments of the present invention, the descriptions of "first," "second," etc. are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the embodiments of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0026] In the embodiments of the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0027] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the embodiments of the present invention.

[0028] Current oil-cooled motor designs often employ a heat dissipation structure with tilted ends to improve the stator core's heat dissipation. This typically requires customized laminations, each with channels or holes oriented in specific directions to allow the cooling oil to flow along a predetermined path. However, this approach places high demands on the lamination manufacturing process, requiring different types of laminations to achieve complex internal flow channel structures, increasing production costs and assembly complexity.

[0029] In view of this, an embodiment of the present invention provides a stator core, a motor heat dissipation structure and a motor, which realizes horizontal oil injection by rotating two identical end stator punching groups by a predetermined angle, replacing the complex internal flow channel structure realized by different types of punching sheets, simplifying the manufacturing process, reducing manufacturing costs, providing greater design flexibility and versatility, and thus achieving better heat dissipation effects.

[0030] In order to better understand the above technical solution, the above technical solution is described in detail below with reference to the accompanying drawings.

[0031] like Figure 1 and Figure 2 As shown, an embodiment of the present invention proposes a stator core, which includes a plurality of middle stator punching sheet groups stacked along the axial direction, and two or more identical end stator punching sheet groups 1 are arranged at the ends of the middle stator punching sheet group. The end stator punching sheet group 1 has stator slots 2 uniformly distributed along the circumferential direction, and each end stator punching sheet group 1 includes a first through hole 11 and a second through hole 12 arranged at intervals along the circumferential direction. The distance from the center of the first through hole 11 to the axis of the end stator punching sheet group 1 is smaller than the distance from the second through hole 12 to the axis of the end stator punching sheet group 1, and the second through hole 12 extends radially along the end stator punching sheet group 1. After the two adjacent end stator punching sheet groups 1 are rotated relative to each other by a predetermined angle, the terminal end of the second through hole 12 of one end stator punching sheet group 1 only partially overlaps with the first through hole 11 of the other end stator punching sheet group 1 to form a conducting hole, and the axis of the conducting hole is collinear with the axis of the first through hole 11.

[0032] In the technical solution adopted in this embodiment, two identical end stator punching groups 1 are used at the ends of the middle stator punching group, and each end stator punching group 1 is provided with a first through hole 11 and a second through hole 12 separated from each other. By rotating the two end stator punching groups 1 by a predetermined angle, the locking end of the second through hole 12 on the first end stator punching group 1 only partially or completely overlaps with the first through hole 11 on the second end stator punching group 1. At the same time, the first through hole 11 on the first end stator punching group 1 is blocked by the first end stator punching group 1 and the second through hole 12 on the second end stator punching group 1 is blocked by the first end stator punching group 1. Only the second through hole 12 on the first end stator punching group 1 and the first through hole 11 on the second end stator punching group 1 are connected, thereby connecting the channel between the two end stator punching groups 1, and the cooling oil first flows radially and then flows axially to realize horizontal spraying of the cooling oil, thereby dissipating heat from the stator core and stator winding. Furthermore, the axis of the guide hole is collinear with the axis of the first through hole 11, allowing the cooling oil to flow along the first through hole 11 and be ejected horizontally, directly onto the end stator winding, thereby improving the heat dissipation effect of the end stator winding. The present application achieves horizontal oil spraying by rotating two identical end stator punching sets 1 by a predetermined angle, replacing the complex internal flow channel structure achieved by using different types of punchings. This simplifies the manufacturing process, reduces manufacturing costs, provides greater design flexibility and versatility, and thus achieves better heat dissipation.

[0033] Optionally, the distance from the center of the first through hole 11 to the axis of the end stator punching group 1 is smaller than the distance from the second through hole 12 to the axis of the end stator punching group 1, so that the first through hole 11 is closer to the stator slot 2, which can extend the radial flow path of the cooling oil, directly act on the stator slot 2, and improve the heat dissipation effect of the stator core.

[0034] In one embodiment, each group of end stator punching sheets 1 may be one or more stacks of punching sheets, each stack may be one or more punching sheets. Each group of middle stator punching sheets may be one or more stacks of punching sheets, each stack may be one or more punching sheets.

[0035] In one embodiment, the number of stator slots 2 is 48: the number of first through holes 11 is 18 and the predetermined angle is 30 degrees or 60 degrees; or the number of first through holes 11 is 12 and the predetermined angle is 22.5 degrees or 45 degrees; or, the number of first through holes 11 is 24 and the predetermined angle is 22.5 degrees or 45 degrees.

[0036] Alternatively, the number of the stator slots 2 is 54, the number of the first through holes 11 is 9, and the predetermined angle is 20 degrees or 60 degrees; or the number of the first through holes 11 is 27, and the predetermined angle is 20 degrees or 60 degrees; or the number of the first through holes 11 is 18, and the predetermined angle is 46.6667 degrees;

[0037] Alternatively, the number of stator slots is 72: the number of first through holes 11 is 18 and the predetermined angle is 30 degrees; or the number of first through holes 11 is 12 and the predetermined angle is 20 degrees or 40 degrees; or the number of first through holes 11 is 24 and the predetermined angle is 20 degrees or 40 degrees.

[0038] It can be understood that the interval between two adjacent first through holes 11 is The interval between two adjacent stator teeth 3 is When the first through hole 11 is evenly divided along the circumference of the end stator punching group 1, the predetermined angle a must satisfy τ t An integer multiple of , and cannot be τ s When the first through hole 11 along the circumferential direction of the end stator punching group 1 cannot be evenly divided, the predetermined angle a must satisfy τ t An integer multiple of , and cannot be all τ s In this way, it can be ensured that the two adjacent end stator punching groups maintain the state of the stator teeth 2 relative to each other after rotation.

[0039] In one embodiment of the present invention, the shortest distance between the first through hole 11 and the axis of the end stator lamination group 1 is equal to the shortest distance between the second through hole 12 and the axis of the end stator lamination group 1. This arrangement can reduce the radial extension length of the second through hole 12 while ensuring that the axis of the through hole is collinear with the axis of the first through hole, thereby improving the structural strength of the end stator lamination group 1.

[0040] In one embodiment of the present invention, the cross-section of the first through hole 11 and / or the second through hole 12 is rectangular. This configuration provides a larger cross-sectional area than a circular oil hole, which helps increase the flow rate and flow of the cooling oil, thereby more effectively removing heat and improving cooling efficiency.

[0041] In one embodiment of the present invention, stator teeth 3 are provided on the inner side of the end stator punching group 1, and the first through-holes 11 and / or the second through-holes 12 are arranged corresponding to the stator teeth 3. During motor operation, the vicinity of the stator teeth 3 is one of the main areas where heat is generated. By arranging the first through-holes 11 and / or the second through-holes 12 corresponding to the stator teeth 3, cooling oil can be directly applied to the vicinity of the stator teeth 3, helping to improve cooling efficiency. Furthermore, without significantly affecting magnetic circuit closure, the magnetic field distribution can be optimized, magnetic resistance can be reduced, and the electromagnetic performance and efficiency of the motor can be improved.

[0042] In one embodiment of the present invention, a plurality of first through holes 11 and / or second through holes 12 are provided along the circumferential array of the punching sheet, thereby forming a plurality of heat dissipation channels, which can simultaneously dissipate heat from the stator core, thereby further improving the heat dissipation effect.

[0043] In one embodiment of the present invention, the diameter of the second through hole 12 decreases as it approaches the axial direction. This allows the coolant to flow radially through the second through hole 12. The diameter decreases near the stator core's axis, increasing the flow rate. This facilitates the flow of cooling oil from the second through hole 12 into the first through hole 11, achieving a transition from radial to axial flow.

[0044] In one embodiment of the present invention, two or more identical end stator punching groups 1 are respectively arranged at both axial ends of the middle stator punching group. In this way, the stator windings at both ends of the stator core can be spray-cooled simultaneously, which is simple and convenient.

[0045] To achieve the above-mentioned purpose, the present invention proposes a motor heat dissipation structure, which is applied to a motor. The stator core is the stator core described above, and a heat dissipation channel is provided on the middle stator punching group. The heat dissipation channel only partially overlaps with the second through hole 12 of one end stator punching group 1. Specifically, the specific structure of the stator core refers to the above-mentioned embodiment. Since the motor heat dissipation structure adopts all the technical solutions of the above-mentioned embodiment, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be described in detail here. As an optional method, the heat dissipation channel extends axially along the middle stator punching group, and the heat dissipation of the middle stator core is achieved through the axial flow of cooling oil. In one embodiment, an oil inlet is also provided in the middle of the heat dissipation channel. Through the provision of the oil inlet, the cooling oil can be conveniently introduced into the heat dissipation channel. After the cooling oil enters the heat dissipation channel through the oil inlet, it flows along the heat dissipation channel to both ends, and then through the cooperation of the first through hole 11 and the second through hole 12 on the two adjacent end stator punching groups 1, the horizontal spray of the coolant is achieved, thereby dissipating heat from the stator winding at the end.

[0046] To achieve the above-mentioned purpose, an embodiment of the present invention proposes a motor, which includes the motor heat dissipation structure described above. Specifically, the specific structure of the motor heat dissipation structure refers to the above-mentioned embodiment. Since the motor adopts all the technical solutions of the above-mentioned embodiment, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiment, which will not be described one by one here. As an optional method, the motor also includes a casing, and the stator core is arranged inside the casing. The casing is provided with an oil inlet hole, and the oil inlet hole and the oil inlet are arranged opposite each other, so that the cooling oil can flow into the heat dissipation channel via the shortest path.

[0047] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the embodiments of the present invention. All equivalent structural transformations made using the description and drawings of the embodiments of the present invention under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the embodiments of the present invention.

Claims

1. A stator core, comprising a plurality of middle stator laminations stacked axially, characterized in that: Two identical end stator sheet groups are arranged at the ends of the middle stator sheet group, and the end stator sheet groups have stator slots evenly distributed along the circumferential direction. Each of the end stator sheet groups includes a first through hole and a second through hole spaced apart along the circumferential direction. The distance from the center of the first through hole to the axis of the end stator sheet group is smaller than the distance from the center of the second through hole to the axis of the end stator sheet group. The second through hole extends radially along the end stator sheet group. After the two adjacent end stator sheet groups are rotated relative to each other by a predetermined angle, the terminal end of the second through hole of one of the end stator sheet groups only partially overlaps with the first through hole of the other end stator sheet group to form a conducting hole, and the axis of the conducting hole is collinear with the axis of the first through hole.

2. The stator core according to claim 1, wherein: The shortest distance from the first through hole to the axis of the end stator punching group is equal to the distance from the second through hole to the axis of the end stator punching group.

3. The stator core according to claim 1, wherein: The cross-section of the first through hole and / or the second through hole is rectangular.

4. The stator core according to claim 1, wherein: Stator teeth are provided on the inner side of the end stator punching group, and the first through hole and / or the second through hole are arranged corresponding to the stator teeth.

5. The stator core according to any one of claims 1 to 4, characterized in that: The number of the stator slots is 48, the number of the first through holes is 18, and the predetermined angle is 30 degrees or 60 degrees, or the number of the first through holes is 12 or 24, and the predetermined angle is 22.5 degrees or 45 degrees; Alternatively, the number of the stator slots is 54, the number of the first through holes is 9 or 27, and the predetermined angle is 20 degrees or 60 degrees, or the number of the first through holes is 18 and the predetermined angle is 46.6667 degrees; Alternatively, the number of the stator slots is 72, the number of the first through holes is 18 and the predetermined angle is 30 degrees, or the number of the first through holes is 12 or 24 and the predetermined angle is 20 degrees or 40 degrees.

6. The stator core according to claim 5, wherein: A plurality of the first through holes and / or the second through holes are arranged along a circumferential array of the punching sheet.

7. The stator core according to claim 5, wherein: The diameter of the second through hole decreases gradually in the axial direction.

8. The stator core according to claim 5, wherein: Two identical end stator sheet groups are respectively arranged at the two axial ends of the middle stator sheet group.

9. A motor heat dissipation structure, applied to a motor, characterized in that: The stator core is the stator core according to any one of claims 1 to 8, and a heat dissipation channel is provided on the middle stator punching group, and the heat dissipation channel at least partially overlaps with the second through hole of only one of the end stator punching groups.

10. A motor, characterized in that: The motor includes the motor heat dissipation structure according to claim 9.

Images