Motor stator oil duct structure

Abstract

The utility model relates to a motor stator oil duct structure, which comprises a stator core, the stator core is composed of two stator segment groups, and each stator segment group comprises a first stator segment, a second stator segment, a third stator segment, a fourth stator segment, a fifth stator segment and a sixth stator segment. The first stator segment, the second stator segment, the third stator segment, the fourth stator segment, the fifth stator segment and the sixth stator segment are respectively composed of different types of punching sheets, and the punching sheets are provided with oil holes or protrusions. The first stator section, the second stator section, the third stator section, the fourth stator section, the fifth stator section and the sixth stator section of the same stator section group are connected in sequence, and the first stator sections of different stator section groups are connected to finally form an oil duct. According to the utility model, the stator core is composed of the two stator segment groups, each stator segment group comprises the six stator segments, and the stator segments are sequentially connected to form the oil duct, so that cooling oil uniformly flows in the stator, and the heat dissipation effect is better.

Description

Technical Field

[0001] This utility model relates to the field of stator oil passage technology, and in particular to a stator oil passage structure for an electric motor. Background Technology

[0002] With the continuous development of high-power-density motors, the heat dissipation of motors has received increasing attention. Currently, commonly used motor cooling methods include air cooling, water cooling, and oil cooling. Oil-cooled motors, due to their direct contact with the heat source, achieve better cooling and are therefore gaining more attention. The stator radial oil channel structure, by forming oil channels directly on the surface of the stator core, achieves better cooling performance compared to other oil pipe cooling methods and reduces the cost of oil guide pipes.

[0003] Utility model patent CN220234297U discloses a stator oil cooling structure for an electric motor, comprising: a housing, a stator core, and a stator winding. The stator core and stator winding are located inside the housing, with the stator winding located on both sides of the stator core. An oil inlet hole is provided on the radial center surface of the housing. The stator core includes several axially distributed core laminations symmetrically arranged about the radial center surface of the housing. The core laminations are combined to form a concave annular oil passage. The core laminations have axial through holes, and the axial through holes, concave annular oil passage, and oil inlet hole are sequentially connected. This patent's stator oil cooling structure cannot guarantee the uniformity of oil spraying from the stator's circumferential oil spray holes while simplifying the welding process.

[0004] Therefore, providing a stator oil channel structure that has a simple stator welding process and ensures uniform oil spraying from the stator's circumferential oil spray holes is an urgent problem to be solved. Utility Model Content

[0005] The purpose of this invention is to overcome the defects of the existing technology and provide a motor stator oil passage structure.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] According to one aspect of this utility model, a stator oil passage structure for an electric motor is provided, comprising a stator core, wherein the stator core is composed of two stator segment groups, each stator segment group comprising a first stator segment, a second stator segment, a third stator segment, a fourth stator segment, a fifth stator segment, and a sixth stator segment. The first stator segment, the second stator segment, the third stator segment, the fourth stator segment, the fifth stator segment, and the sixth stator segment are respectively composed of different types of laminations, and oil holes or protrusions are installed on the laminations. The first stator segment, the second stator segment, the third stator segment, the fourth stator segment, the fifth stator segment, and the sixth stator segment of the same stator segment group are connected sequentially, and the first stator segments of different stator segment groups are connected to each other to finally form an oil passage.

[0008] As a preferred technical solution, the different stator segment groups are symmetrically connected with their axial mid-planes in between.

[0009] As a preferred technical solution, the different stator segment groups are rotated by an angle within a first preset range.

[0010] As a preferred technical solution, the lamination includes a first lamination, a second lamination, and a third lamination. The first stator segment and the second stator segment are both composed of the first lamination, the third stator segment, the fourth stator segment, and the fifth stator segment are all composed of the second lamination, and the sixth stator segment is composed of the third lamination.

[0011] As a preferred technical solution, the first lamination includes multiple protrusions, and a first oil passage is formed between adjacent protrusions. The second lamination includes a first oil passage and a second oil passage. The third lamination includes a third oil passage. A second oil passage is formed between the second oil passages of the third stator segment and the fourth stator segment. The first oil passage of the third stator segment and the second oil passage of the fourth stator segment form the third oil passage.

[0012] As a preferred technical solution, the protrusion includes a sealing plate and a weld bead plate, and the sealing plate and the weld bead plate are connected.

[0013] As a preferred technical solution, the structure further includes an end spray angle, which is composed of the second oil passage hole of the fourth stator section and the first oil passage hole of the fifth stator section.

[0014] As a preferred technical solution, the outer diameter of the first oil passage is larger than the inner diameter of the second oil passage, the outer diameter of the first oil passage is smaller than the outer diameter of the second oil passage, the outer diameter of the third oil passage is smaller than the outer diameter of the first oil passage, and the outer diameter of the third oil passage is larger than the inner diameter of the first oil passage.

[0015] As a preferred technical solution, the structure further includes a first weld bead and a second weld bead, wherein the second stator segment, the third stator segment, the fourth stator segment, the fifth stator segment and the sixth stator segment are connected by the first weld bead, and the first stator segment and the second stator segment are connected by the second weld bead.

[0016] As a preferred technical solution, the first stator segments of the different stator segment groups are connected by a second weld.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The stator core of this utility model is composed of two stator segment groups, each stator segment group including six stator segments. The stator segments are connected in sequence to form oil channels, so that the cooling oil flows evenly in the stator and the heat dissipation effect is better.

[0019] 2. The stator core of this utility model consists of two stator segments symmetrical about the mid-axis. The stator segments are ultimately assembled by stacking different types of laminations, which can reduce production costs, improve production efficiency, and simplify installation.

[0020] 3. This utility model provides protrusions, a first oil passage hole, a second oil passage hole, and a third oil passage hole on different laminations, forming a first oil channel, a second oil channel, and a third oil channel respectively, so that the cooling oil flows evenly in the oil channels, has more sufficient contact with the stator, and has a better heat dissipation effect.

[0021] 4. This utility model also includes a first weld bead and a second weld bead to weld different stator segments together, making the connection method simple and reliable.

[0022] 5. The angle of rotation between different stator segment groups of this utility model within a first preset range makes the first weld bead and the first oil channel (circumferential flow channel) disconnected, thus avoiding the risk of oil leakage. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the stator core of this utility model;

[0024] Figure 2 This is a schematic diagram of the stator segment distribution of this utility model;

[0025] Figure 3 This is a schematic diagram of the first lamination structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the second lamination structure of this utility model;

[0027] Figure 5 This is a schematic diagram of the third lamination structure of this utility model;

[0028] Figure 6 This is a schematic diagram of the weld structure of this utility model;

[0029] Figure 7 This is a schematic diagram of the second oil passage structure of this utility model;

[0030] Figure 8 This is a schematic diagram of the third oil passage structure of this utility model;

[0031] Figure 9 This is a schematic diagram of the end spray angle structure of this utility model;

[0032] Figure 10 This is a schematic diagram showing the inner and outer diameters of the second lamination of this utility model;

[0033] Figure 11 This is a schematic diagram showing the inner and outer diameters of the third lamination of this utility model.

[0034] 1. First stator segment; 2. Second stator segment; 3. Third stator segment; 4. Fourth stator segment; 5. Fifth stator segment; 6. Sixth stator segment; 7. Protrusion; 8. First oil passage; 9. First oil through hole; 10. Second oil through hole; 11. Third oil through hole; 12. First weld bead; 13. Second weld bead; 14. End spray angle; 15. Inner diameter; 16. Outer diameter. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0036] The working principle of the stator oil channel structure: By designing a special oil circuit structure, cooling oil is sprayed from the edge of the motor stator core towards the center for cooling. Utilizing the effective thickness and angle distribution of the core, as well as the cooling medium flow cavity formed by the oil spray components, the stator core, and the motor housing, the cooling oil forms a specific flow path inside the motor, thereby achieving direct cooling of the stator core and windings.

[0037] Structural composition

[0038] Stator core: Typically composed of multiple stator laminations stacked together. Oil holes are distributed circumferentially on the outer circumference of the laminations. By rotating the stacks at different angles, the oil holes of adjacent laminations are interconnected to form oil channels. Some stator cores consist of laminations with protruding outer circumferences in the middle and laminations with stepped holes at the ends, forming stepped oil injection channels.

[0039] Oil spraying components: Located at both ends of the stator core, forming a flow cavity for the cooling medium with the stator core and the housing. The oil spraying components are equipped with multiple inclined guide spray holes, which can be arranged in a single layer or multiple layers along the radial direction of the oil spraying components, and can be evenly or non-uniformly distributed circumferentially. Directional nozzles or guide vanes can also be installed in the guide spray holes to optimize the spraying effect.

[0040] Cooling chamber: A sealed space formed between the outer periphery of the stator assembly, the outer periphery of the rotor assembly, and the housing, providing a channel for the flow of cooling oil. The cooling oil flows along the outer surface of the stator core within the chamber and is sprayed out through the oil spraying channel of the oil spraying component to cool the stator core and windings.

[0041] However, existing stator oil channel structures cannot guarantee the uniformity of oil spraying from the stator's circumferential oil nozzles while simplifying the welding process. To address this issue, this invention provides a motor stator oil channel structure. The stator core of this invention consists of two stator segment groups, each group comprising six stator segments connected sequentially to form oil channels. This allows the cooling oil to flow uniformly within the stator, resulting in better heat dissipation. The stator core of this invention is composed of two stator segment groups symmetrical about their axial mid-plane. These groups are ultimately formed by stacking different types of laminations, reducing production costs, increasing production efficiency, and simplifying installation. This invention features protrusions, a first oil passage, a second oil passage, and a third oil passage on different laminations, forming the first, second, and third oil channels respectively. This ensures uniform flow of cooling oil within the channels, resulting in more thorough contact with the stator and better heat dissipation. This invention also includes a first weld bead and a second weld bead to weld the different stator segments together, providing a simple and reliable connection method. The angle of rotation between different stator segment groups of this utility model is within a first preset range, so that the first weld bead and the first oil channel (circumferential flow channel) are not connected, which can avoid the risk of oil leakage.

[0042] Example 1

[0043] like Figure 1 and Figure 2 As shown, a stator oil passage structure for an electric motor includes a stator core composed of two stator segment groups. Each stator segment group includes a first stator segment 1, a second stator segment 2, a third stator segment 3, a fourth stator segment 4, a fifth stator segment 5, and a sixth stator segment 6. The first stator segment 1, the second stator segment 2, the third stator segment 3, the fourth stator segment 4, the fifth stator segment 5, and the sixth stator segment 6 are each composed of different types of laminations. Oil holes or protrusions 7 are installed on the laminations. The first stator segment 1, the second stator segment 2, the third stator segment 3, the fourth stator segment 4, the fifth stator segment 5, and the sixth stator segment 6 of the same stator segment group are connected sequentially. The first stator segments 1 of different stator segment groups are connected to each other to finally form an oil passage.

[0044] like Figures 3-5 As shown, the lamination includes a first lamination, a second lamination, and a third lamination. The first stator segment 1 and the second stator segment 2 are both composed of the first lamination, the third stator segment 3, the fourth stator segment 4, and the fifth stator segment 5 are all composed of the second lamination, and the sixth stator segment 6 is all composed of the third lamination.

[0045] like Figures 6-11As shown, the first lamination includes a plurality of protrusions 7, and a first oil passage 8 is formed between adjacent protrusions. The second lamination includes a first oil passage 9 and a second oil passage 10. The third lamination includes a third oil passage 11. A second oil passage is formed between the second oil passages 10 of the third stator segment 3 and the fourth stator segment 4. The first oil passage 9 of the third stator segment 3 and the second oil passage 10 of the fourth stator segment 4 form the third oil passage.

[0046] The protrusion 7 includes a sealing plate and a weld bead plate, which are connected together.

[0047] In this embodiment, the present invention provides three types of laminations, which are stacked together to form a stator centripetal oil cooling structure. The protrusion 7 of the first lamination forms an annular oil reservoir, which allows the oil to fill the reservoir quickly compared to other patents. The flow rate of each stator nozzle is more uniform in the circumferential direction. The diameter of the protrusion 7 is the same as that of the second and third laminations, which facilitates process clamping.

[0048] The axial mid-plane generally refers to a specific plane located at the midpoint along the axial direction in an object or structure with axial characteristics. The axial mid-plane can be understood as a plane that bisects the axis along the axial direction. For example, the axial mid-plane of a cylindrical shaft is the plane passing through the axis of the shaft and equidistant from both end faces of the shaft.

[0049] The second to sixth stator sections are connected by the first weld 12, and the first and second stator sections are connected by the second weld 13. The first and second stator sections are connected to the first and second stator sections symmetrical to the axial mid-plane by the second weld 13, simplifying the process. The third stator section 3 and the fourth stator section 4 can both provide second oil passages 10 to form a second oil passage, or the third stator section 3 can provide a first oil passage 9 and the fourth stator section 4 can provide a second oil passage 2 to form a third oil passage. The second oil passage has lower overall oil resistance, while the third oil passage has more uniform flow rates at each nozzle. Different oil passage types can be selected according to requirements.

[0050] The structure also includes an end spray angle 14, which is composed of the second oil passage 10 of the fourth stator section 4 and the first oil passage 9 of the fifth stator section 5.

[0051] In this embodiment, the end spray angle 14 is formed by the fourth to sixth stator segments. The fourth stator segment 4 provides the second oil passage hole 10 of the second lamination, and the fifth stator segment provides the first oil passage hole 9 of the second lamination. The shape of the oil passage hole includes, but is not limited to, rectangle, circle, semicircle, etc.

[0052] The outer diameter of the first oil passage 9 is larger than the inner diameter of the second oil passage 10, the outer diameter of the first oil passage 9 is smaller than the outer diameter of the second oil passage 10, the outer diameter of the third oil passage 11 is smaller than the outer diameter of the first oil passage 9, and the outer diameter of the third oil passage 11 is larger than the inner diameter of the first oil passage 9.

[0053] When the oil passage hole is located on the lamination, it will form four walls. If the oil passage hole is installed on the edge of the lamination, there will only be three walls. Since the edge of the lamination is in contact with the housing, the contact surface is taken as the wall (i.e., the edge line of the lamination). The shortest distance from the wall of the oil passage hole to the center of the lamination is the inner diameter, and the longest distance from the wall of the oil passage hole to the center of the lamination is the outer diameter.

[0054] The structure also includes a first weld bead 12 and a second weld bead 13. The second stator segment 2, the third stator segment 3, the fourth stator segment 4, the fifth stator segment 5, and the sixth stator segment 6 are connected by the first weld bead 12, and the first stator segment 1 and the second stator segment 2 are connected by the second weld bead 13. The first stator segments 1 of different stator segment groups are connected by the second weld bead 13. By setting weld beads, the various parts are connected together.

[0055] The different stator segment groups are symmetrically connected with respect to their axial mid-plane. The different stator segment groups are rotated within a first preset range of angles.

[0056] Different stator segment groups are rotated by a certain angle. For example, in this invention, the first oil passage 9 is set to 18 in the second lamination. The calculated angle difference is 20°, and the rotation angle is 20°, so that the first weld 12 is not connected to the first oil passage (circumferential flow channel), thus avoiding the risk of oil leakage. Since it is symmetrical about the axial mid-plane, the first stator segment 1 and the second stator segment 2 will form the first oil passage 8 (i.e., an annular oil reservoir) with the axial mid-plane as the center. Each stator segment can be composed of multiple laminations.

[0057] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An oil passage structure of a stator of an electric machine comprising a stator core, characterized by, The stator core is composed of two stator segment groups, each of which includes a first stator segment (1), a second stator segment (2), a third stator segment (3), a fourth stator segment (4), a fifth stator segment (5) and a sixth stator segment (6), which are respectively composed of different types of laminations, and oil holes or protrusions (7) are installed on the laminations, the first stator segment (1), the second stator segment (2), the third stator segment (3), the fourth stator segment (4), the fifth stator segment (5) and the sixth stator segment (6) of the same stator segment group are sequentially connected, and the first stator segments (1) of different stator segment groups are connected, thereby forming oil channels.

2. The motor stator oil passage structure according to claim 1, characterized by The first stator segments (1) of different stator segment groups are connected by the second welding lines (13).

3. The motor stator oil passage structure according to claim 1, characterized by The first stator segments (1) of different stator segment groups are connected by the second welding lines (13).

4. The motor stator oil passage structure according to claim 1, characterized by The first stator segment (1) and the second stator segment (2) are composed of the first laminations, the third stator segment (3), the fourth stator segment (4) and the fifth stator segment (5) are composed of the second laminations, and the sixth stator segment (6) is composed of the third laminations.

5. A motor stator oil passage structure according to claim 4, wherein The first lamination includes a plurality of protrusions (7), the first oil channels (8) are formed between adjacent protrusions, the second lamination includes a first oil hole (9) and a second oil hole (10), and the third lamination includes a third oil hole (11), the second oil holes (10) of the third stator segment (3) and the fourth stator segment (4) form a second oil channel, and the first oil hole (9) of the third stator segment (3) and the second oil hole (10) of the fourth stator segment (4) form a third oil channel.

6. A motor stator oil passage structure according to claim 5, wherein The protrusion (7) includes a sealing plate and a welding line plate, and the sealing plate and the welding line plate are connected.

7. A motor stator oil passage structure according to claim 5, wherein The structure further includes an end spraying angle (14) composed of the second oil hole (10) of the fourth stator segment (4) and the first oil hole (9) of the fifth stator segment (5).

8. The motor stator oil passage structure according to claim 5, characterized by The outer diameter of the first oil hole (9) is greater than the inner diameter of the second oil hole (10), the outer diameter of the first oil hole (9) is smaller than the outer diameter of the second oil hole (10), the outer diameter of the third oil hole (11) is smaller than the outer diameter of the first oil hole (9), and the outer diameter of the third oil hole (11) is greater than the inner diameter of the first oil hole (9).

9. The motor stator oil passage structure of claim 1, wherein The structure further includes a first welding line (12) and a second welding line (13), the second stator segment (2), the third stator segment (3), the fourth stator segment (4), the fifth stator segment (5) and the sixth stator segment (6) are connected by the first welding line (12), and the first stator segment (1) and the second stator segment (2) are connected by the second welding line (13).

10. A motor stator oil passage structure according to claim 9, wherein The first stator segments (1) of different stator segment groups are connected by the second welding lines (13). The first stator segments (1) of different stator segment groups are connected by the second welding lines (13).

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