Stator injection molding structure of oil-cooled motor
By adjusting the design of the stator punching and the position of the oil injection holes, radial oil rings and oil injection holes are formed, which solves the problem of uneven cooling in oil-cooled flat wire motors, achieves improved cooling efficiency and reduced costs.
Patent Information
- Application Number
- CN202422739477.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-11
AI Technical Summary
In existing oil-cooled flat wire motors, the cooling at both ends of the stator is uneven, resulting in unsatisfactory cooling effects. In addition, the existing structure requires the use of additional oil circuit components, which increases system costs.
An oil-cooled motor stator injection molding structure is designed. By adjusting the diameter of the stator punching sheet and the position of the oil injection hole, radial oil rings and oil injection holes are formed. Combined with the injection molding block and weld bead, the cooling oil is evenly distributed and sprayed, simplifying the oil circuit structure.
This achieves more uniform cooling of the windings, improves cooling efficiency, reduces system costs, and simplifies the assembly process.
Smart Images
Figure CN223487948U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor technology, and in particular relates to an injection-molded structure for an oil-cooled motor stator. Background Technology
[0002] In oil-cooled flat wire motors with hair-pin windings, the different heights and widths at both ends of the winding allow for different oil spray angles and volumes, resulting in better heat dissipation. However, the stator core, limited by the lamination design, mold design, and mold costs, has identical lamination shapes and oil circuit structures at both ends, leading to the same number and size of oil spray holes, resulting in identical spray angles and almost identical oil volumes. When the stator is cooled by oil, the welded end and crown end have different heights, but the oil circuit structures, spray heights, and spray distances are identical on both sides. This causes uneven cooling at both ends of the winding, resulting in unsatisfactory cooling performance. Utility Model Content
[0003] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide an injection-molded structure for an oil-cooled motor stator, which enables more uniform cooling of the windings and improves cooling efficiency.
[0004] To achieve the above-mentioned objectives, this utility model adopts the following technical solution:
[0005] An oil-cooled motor stator injection molding structure includes a winding and a stator core. The winding is inserted into the stator core, which is formed by stacking stator laminations. From the center outwards, stator laminations B, C, and A are respectively, with stator laminations A and B sandwiched between them. The stator laminations C and A have the same diameter, while the stator laminations B have a smaller diameter than both C and A. This forms a radial oil ring between the two central stator laminations C and the two side stator laminations C and A. The outer edge of stator lamination C has a ring of oil injection holes C, and the outer edge of stator lamination A has multiple oil injection holes A. Some of the oil injection holes A also contain injection molding blocks.
[0006] As a preferred embodiment, the stator lamination A is further provided with a notch A on its side wall, and multiple notches A are stacked to form a short weld bead.
[0007] As a preferred embodiment, the stator lamination C is further provided with a notch C on its side wall, and multiple notches C are stacked to form a long weld bead that allows oil to pass through.
[0008] As a preferred embodiment, the stator lamination B has a welding positioning protrusion on its side wall, and the welding positioning protrusion is aligned with a long weld bead or a short weld bead.
[0009] As a preferred option, multiple stator laminations A are deflected and stacked, causing multiple notches A or multiple oil injection holes A to be misaligned with each other.
[0010] As a preferred embodiment, the stator core is fixed to the inner wall of the housing, and the housing is also provided with an oil inlet, which is connected to the radial oil ring in the middle of the stator core.
[0011] As a preferred embodiment, the winding includes a flat wire conductor inserted in the middle of the stator core, and winding twist ends and winding crown ends at both ends, with the oil injection hole A on the stator lamination A aligned with the winding twist ends and winding crown ends.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0013] This invention, through the design of the stator core structure, ensures that cooling oil is distributed around the stator core, minimizing dead oil areas and allowing the oil to fully surround the core, resulting in excellent cooling performance. Furthermore, it ensures that the oil is evenly sprayed from designated injection holes, meeting the different injection volumes and distances required at both ends of the winding, leading to more uniform cooling and further improving cooling efficiency. The structure of this invention eliminates the need for oil pipes, injection rings, sealing rings, and other oil circuit components, simplifying assembly and effectively reducing system costs. Attached Figure Description
[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.
[0015] Figure 1 This is a schematic diagram of the overall structure of the stator and housing of this utility model;
[0016] Figure 2 This is a cross-sectional structural diagram of the stator and housing of this utility model;
[0017] Figure 3 This is a schematic diagram of the overall structure of the stator of this utility model;
[0018] Figure 4 This is an exploded structural diagram of the stator of this utility model.
[0019] The attached figures are labeled as follows: 1. Stator core; 11. Stator lamination A; 110. Oil injection hole A; 111. Notch A; 112. Injection block; 12. Stator lamination B; 121. Welding positioning protrusion; 13. Stator lamination C; 130. Oil injection hole C; 131. Notch C; 14. Radial oil ring; 20. Flat wire conductor in the middle of the winding; 21. Winding twist end; 22. Winding crown end. Detailed Implementation
[0020] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0022] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.
[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0027] like Figures 1 to 4 As shown, an oil-cooled motor stator injection molding structure includes a winding and a stator core 1. The winding is inserted into the stator core 1. The winding includes a flat wire conductor 20 in the middle of the winding inserted into the stator core 1, and winding twist ends 21 and winding crown ends 22 at both ends. The stator core 1 is fixed to the inner wall of the housing 3. The housing 3 is also provided with an oil inlet 31.
[0028] The stator core 1 is formed by stacking stator laminations, with stator laminations B12, C13, and A11 arranged from the center to both sides. Stator laminations A11 and B12 are sandwiched between each other. The stator laminations C13 and A11 have the same diameter, while the stator lamination B12 has a smaller diameter than both C13 and A11. This creates a radial oil ring 14 between the two central stator laminations C13 and the two side stator laminations C13 and A11. The oil inlet 31 is connected to the radial oil ring 14 in the center of the stator core 1.
[0029] The stator lamination C13 has a ring of oil injection holes C130 on its outer edge, and the stator lamination A11 has multiple oil injection holes A110 on its outer edge. Some of the oil injection holes A110 also have injection plastic blocks 112 inside them. The oil injection holes A110 on the stator lamination A11 are aligned with the winding twist end 21 and the winding crown end 22.
[0030] The stator lamination A11 has a notch A111 on its side wall, and multiple notches A111 are stacked to form a short weld bead. The stator lamination C13 has a notch C131 on its side wall, and multiple notches C131 are stacked to form a long weld bead that allows oil to pass through. The stator lamination B12 has a welding positioning protrusion 121 on its side wall, which is aligned with either the long or short weld bead. Through the cooperation of the welding positioning protrusion and the corresponding long and short weld beads, all the rotor laminations are welded and fixed to form a complete stator core. At the same time, cooling oil can also pass through the long weld bead, improving the cooling efficiency of the stator.
[0031] Multiple stator laminations A11 are stacked with deflection, causing the multiple notches A111 or multiple oil injection holes A110 to be misaligned. A certain angle of deflection is designed for each axially adjacent stator core segment in the circumferential direction. The stator core employs segmented welding and short weld bead processes to form the internal oil passage structure. Furthermore, a stator core injection molding scheme is used, sealing some oil holes. During injection molding, tooling is used to seal the back of the oil holes, and injection molding is performed from the front. The oil passage structure at the oil outlet of the core is adjusted, and the oil holes are staggered. The axially adjacent segments at the oil injection holes are deflected at an angle in the circumferential direction, causing the oil holes to be misaligned, achieving a structure suitable for injection molding.
[0032] The structure of this utility model features cooling oil distributed around the stator core, resulting in a small dead oil zone and sufficient oil to fully surround the core, thus achieving good cooling effect. Simultaneously, the oil is sprayed from designated oil injection holes and deflected at a certain angle by the stator core itself, forming oil channel baffles. This controls the oil to flow in the designed direction, meeting the requirement of different oil injection distances at both ends of the stator, resulting in good cooling effect.
[0033] This utility model adopts a platform design, which makes it easy to adjust the number of injection holes and the number of oil injection holes by setting the number of injection holes, so as to adjust the appropriate oil injection distance and oil injection height for the twist end and the crown end respectively. The oil circuit structure is flexible in the platform design, and the epoxy molding compound does not fall off under the pressure of cooling oil, and the structure is stable.
[0034] The structure of this utility model does not require oil pipes, injection rings, sealing rings or other oil circuit components, making assembly simple and effectively reducing system costs.
[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0036] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.
Claims
1. A stator injection molding structure for an oil-cooled motor, comprising windings and a stator core (1), wherein the windings are inserted into the stator core (1), characterized in that: The stator core (1) is formed by stacking stator laminations, and from the middle to both sides are stator laminations B (12), C (13) and A (11), with stator lamination B (12) sandwiched between stator laminations A (11) and B (12). The stator laminations C (13) and A (11) have the same diameter, and the stator lamination B (12) has a smaller diameter than C (13). The stator laminations A (11) and C (13) in the middle form a radial oil ring (14) between the two stator laminations C (13) in the middle and the stator laminations C (13) and A (11) on both sides. The stator laminations C (13) have an oil injection hole C (130) on their outer edge. The stator laminations A (11) have multiple oil injection holes A (110) on their outer edge. Some of the oil injection holes A (110) also have a plastic injection block (112) inside them.
2. The oil-cooled motor stator injection molding structure according to claim 1, characterized in that, The stator lamination A (11) is also provided with a notch A (111) on its side wall, and multiple notches A (111) are stacked to form a short weld bead.
3. The oil-cooled motor stator injection molding structure according to claim 1, characterized in that, The stator lamination C (13) also has a notch C (131) on its side wall, and multiple notches C (131) are stacked to form a long weld bead that can pass oil.
4. The oil-cooled motor stator injection molding structure according to claim 2 or 3, characterized in that, The stator lamination B (12) has a welding positioning protrusion (121) on its side wall, which is aligned with a long weld bead or a short weld bead.
5. The injection-molded structure of an oil-cooled motor stator according to claim 1, characterized in that, Multiple stator laminations A (11) are deflected and stacked, causing multiple notches A (111) or multiple oil injection holes A (110) to be misaligned with each other.
6. The oil-cooled motor stator injection molding structure according to claim 1, characterized in that, The stator core (1) is fixed on the inner wall of the housing (3). The housing (3) is also provided with an oil inlet (31), which is connected to the radial oil ring (14) in the middle of the stator core (1).
7. The oil-cooled motor stator injection molding structure according to claim 1, characterized in that, The winding includes a flat wire conductor (20) inserted in the stator core (1) and winding twist end (21) and winding crown end (22) at both ends. The oil injection hole A (110) on the stator lamination A (11) is aligned with the winding twist end (21) and winding crown end (22).