New energy automobile motor stator structure
By incorporating oblique oil passages and grooves into the stator structure of new energy vehicle motors, the stator structure is simplified, solving the problems of complex cooling structures and numerous components in existing motors, and achieving efficient cooling and low-cost motor stator design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING TSINGSHAN IND
- Filing Date
- 2025-06-05
- Publication Date
- 2026-05-05
AI Technical Summary
Existing new energy vehicle motor stator cooling structures are complex, have many parts, are costly, are complicated to assemble, and have poor cooling effects, failing to meet the requirements of lightweighting and low cost.
A new energy vehicle motor stator structure is adopted, including a first end core, a middle core, and a second end core. By setting oblique oil passages and grooves on the cores, an outer oil passage is formed to realize the cooling oil spraying function. Parts such as oil injection rings, sealing rings, and oil injection pipes are eliminated, and stator end spraying is achieved only by adjusting the structure of the laminations.
The stator structure has been simplified, the number of parts and assembly complexity have been reduced, cooling efficiency and assembly efficiency have been improved, material procurement and management costs have been reduced, and the reliability and production cycle of the motor assembly have been enhanced.
Smart Images
Figure CN224204837U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology for new energy vehicles, and in particular to a stator structure for a new energy vehicle motor. Background Technology
[0002] With the development of new energy vehicles, their popularity is increasing. The motor is a core component of new energy vehicle drives, and to ensure its performance, stability, and lifespan, its operating temperature needs to be controlled. Currently, the main cooling method for the stator end windings of new energy vehicle motors is the oil injection ring system. This system has two oil injection rings and four sealing rings. Cooling oil passes through the stator core and enters the injection ring cavity, finally cooling the stator end windings through the injection rings. While this method is effective, it involves many components, resulting in high BOM and management costs. The assembly process is also complex, and there is a risk of burning the injection rings and sealing rings during stator heat fitting. Another stator end winding cooling method uses oil injection pipes. This system has at least two injection pipes fixed with multiple screws. Cooling oil enters the injection pipes and flows to the nozzles to cool the motor end windings. This solution also suffers from a large number of parts, high BOM and management costs, and complex assembly processes. In addition, the fuel injection pipe inlet needs to be sealed with the housing oil passage, which increases the risk of failure. Furthermore, the fuel injection pipe and mounting screws also occupy some layout space, which affects the lightweighting and miniaturization of the electric drive system of new energy vehicles.
[0003] Based on the development trend of lightweight, high power density and low cost of new energy vehicle motors, the two stator end winding cooling solutions can no longer meet market demands. There is an urgent need to provide a new motor stator structure that can reduce the number of parts and reduce assembly complexity while ensuring cooling effect. Utility Model Content
[0004] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to solve the problems of complex cooling structure, many parts, high cost, inconsistent assembly and low cooling effect of existing motor stator, and to provide a new energy vehicle motor stator structure with simpler overall structure, fewer parts, convenient and quick assembly, improved assembly efficiency, reduced overall cost, and improved cooling effect of motor stator structure.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a stator structure for a new energy vehicle motor, characterized in that it includes a first end core, a middle core, and a second end core; the end of the first end core is provided with at least one first oblique oil passage, and the end of the second end core is provided with at least one second oblique oil passage; one end of the first and second oblique oil passages respectively penetrates the end faces of the first and second end cores, and the other end extends towards the middle core and outwards from the first and second end cores, until it penetrates one end of the first and second end cores near the middle core and the outer side; on the outer side of the middle core, a plurality of interconnected grooves are distributed around it; when the middle core is assembled with the motor housing, a plurality of external oil passages are formed between the grooves and the motor housing, and the external oil passages are simultaneously connected to the first and second oblique oil passages.
[0006] Further, the first end core includes a first lamination, a second lamination, and a third lamination, wherein the third lamination is attached to the central core; the first lamination includes multiple first laminations stacked together, the second lamination includes multiple second laminations stacked together, and the third lamination includes multiple third laminations stacked together; the first lamination has at least one oil hole circumferentially located near its outer edge, and the second lamination has a first guide hole corresponding to the oil hole, the guide hole containing a first guide piece, one end of the first guide piece being connected to the side of the first guide hole near the axis of the second lamination, and the other side being inclined and extending towards the central core; the third lamination has an opening groove corresponding to the oil hole, the opening groove penetrating the outer edge of the third lamination, and its side near the axis of the second lamination being located inside the end of the first guide piece connected to the first guide hole.
[0007] Further, the second end core includes a fourth lamination, a fifth lamination, and a sixth lamination, wherein the fourth lamination is attached to the central core; the fourth lamination includes multiple fourth laminations stacked together, the fifth lamination includes multiple fifth laminations stacked together, and the sixth lamination includes multiple sixth laminations stacked together; the fourth lamination has at least one first slot along the circumferential direction near its outer edge, and the first slot penetrates the outer edge of the third lamination; the fifth lamination has a second guide hole corresponding to the position of the first slot, and a second guide piece is provided in the second guide hole, one end of which is connected to the side of the second guide hole away from the axis of the fifth lamination, and the other end is inclined and extends away from the central core; the sixth lamination has a second slot corresponding to the position of the first slot, and the second slot penetrates the outer edge of the sixth lamination, with its side near the axis of the sixth lamination located inside the side of the second guide hole near the axis of the fifth lamination.
[0008] Furthermore, the central core includes a central lamination, which includes several seventh laminations stacked together; on the outer edge of the seventh lamination, several protrusions are arranged around it, wherein the protrusions on the seventh lamination are staggered or alternately distributed, or the protrusions on several adjacent seventh laminations overlap and are then staggered or alternately distributed, and the groove is formed between two adjacent protrusions or between two protrusions at corresponding positions.
[0009] Furthermore, both the first and second inclined oil channels are multiple channels that are evenly distributed around the first and second end iron cores, respectively.
[0010] Furthermore, the first and second inclined oil passages are arranged opposite each other or staggered.
[0011] Compared with the prior art, the present invention has the following advantages:
[0012] 1. In this solution, the stator core oil channel structure is simple. It can achieve the stator end spraying function by setting through holes, slots, guide plates and convex plates on different core laminations and by stacking the laminations without other auxiliary parts. The whole assembly is convenient, the assembly efficiency is high and the stability is better.
[0013] 2. To meet the cooling requirements of different motors, simply set different numbers of inclined oil channels on the iron cores at both ends. Each inclined oil channel can be set at a different angle to meet the spraying requirements of different positions of the end windings. This can greatly improve the versatility of the entire stator structure.
[0014] 3. The outer periphery of the central iron core has staggered fins, which increases the heat dissipation area of the iron core and further improves the cooling efficiency of the stator iron core.
[0015] 4. This solution eliminates parts such as the oil injection ring, sealing ring, oil injection pipe, and fastening screws, and also eliminates the assembly process of many parts. By only adjusting the structure of the laminations, the end winding spraying function is realized, which directly reduces the material procurement cost and material management cost of the motor, while improving the production cycle of the motor assembly, increasing the reliability of the motor assembly, and reducing the failure probability of the motor assembly. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model.
[0017] Figure 2 This is a schematic diagram of the structure of the first inclined flow channel, the second inclined flow channel, and the outer flow channel.
[0018] Figure 3 for Figure 1 Enlarged view of part A of the first end core.
[0019] Figure 4 for Figure 1 Enlarged view of part B of the second end core.
[0020] Figure 5 This is a schematic diagram of the central iron core.
[0021] Figure 6 for Figure 5 A schematic diagram of the structure of part C in the middle.
[0022] Figure 7 This is a schematic diagram showing the flow direction of cooling oil on the outer periphery of the stator.
[0023] Figure 8 This is a schematic diagram of the structure of the present invention after assembly with the motor housing.
[0024] Figure 9 for Figure 9 A sectional view along the DD direction.
[0025] In the diagram: 1—First end core, 2—Middle core, 3—Second end core, 4—First lamination, 5—Second lamination, 6—Third lamination, 7—Oil hole, 8—First guide hole, 9—First guide piece, 10—Opening slot, 11—Fourth lamination, 12—Fifth lamination, 13—Sixth lamination, 14—First slot, 15—Second guide hole, 16—Second guide piece, 17—Second slot, 18—Seventh lamination, 19—Protrusion, 20—Motor housing, 21—Liquid inlet pipe. Detailed Implementation
[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0028] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. 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. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 based on the specific circumstances.
[0029] Example: See Figures 1 to 9 A stator structure for a new energy vehicle motor includes a first end core 1, a middle core 2, and a second end core 3. During assembly, the first end core 1, the middle core 2, and the second end core 3 are preferably stacked and fastened together, or fixed with external fasteners, and then installed into a motor housing 20, where they are tightly fitted together to form the motor stator. A liquid inlet pipe 21 is provided in the middle of one side of the motor housing 20, and this liquid inlet pipe 21 is directly opposite the middle of the middle core 2 along the axial direction and communicates with the interior of the motor housing 20.
[0030] The first end core 1 has at least one first oblique oil channel at its end, and the second end core 3 has at least one second oblique oil channel at its end. One end of each of the first and second oblique oil channels passes through the end faces of the first and second end cores 1 and 3, respectively, while the other end extends towards the middle core 2 and outwards from the first and second end cores 1 and 3, until it passes through the end of the first and second end cores 1 and 3 near the middle core 2 and outwards. Several interconnected grooves are distributed around the outer side of the middle core 2. After the middle core 2 is assembled with the motor housing 20, several external oil channels are formed between the grooves and the motor housing 20, and these external oil channels are simultaneously connected to the first and second oblique oil channels. During processing, the first and second oblique oil channels are multiple channels evenly distributed around the first and second end cores 1 and 3, respectively. By increasing the oblique flow channels, the spraying effect of the coolant can be improved, thereby enhancing the cooling effect to meet the cooling requirements of different motors. As one embodiment, the first and second inclined oil passages are arranged opposite each other or staggered.
[0031] In implementation, the first end core 1 includes a first lamination, a second lamination, and a third lamination, wherein the third lamination is attached to the middle core 2. The first lamination includes multiple first laminations 4 stacked together, the second lamination includes multiple second laminations 5 stacked together, and the third lamination includes multiple third laminations 6 stacked together. At least one oil hole 7 is provided circumferentially near the outer edge of the first lamination 4, and a first guide hole 8 is provided corresponding to the oil hole 7 in the second lamination 5. The side of the first guide hole 8 away from the axis of the end core is located outside the side of the oil hole 7 away from the axis of the end core. A first guide piece 9 is provided inside the guide hole, one end of which is connected to the side of the first guide hole 8 near the axis of the second lamination 5, and the other side is inclined and extends towards the middle core 2. In implementation, the first guide piece 9 is formed by stamping the second lamination 5, so that the first guide piece 9 and the second lamination 5 are formed as one piece. The third lamination 6 has an opening groove 10 corresponding to the oil hole 7. The opening groove 10 penetrates the outer edge of the third lamination 6, and its side near the axis of the second lamination 5 is located inside the end of the first guide plate 9 connected to the first guide hole 8. When the laminations are stacked, a first oblique oil channel is formed between the first guide plate 9 and the side of the oil hole 7 and the first guide hole 8 away from the axis of the first end core 1. The angle between the first guide plate 9 and the end face of the first end core 1 is α1, and the angle between the straight line containing the side of the oil hole 7 and the first guide hole 8 away from the axis of the first end core 1 and the end face of the first end core 1 is α2. Preferably, α1=α2, that is, the straight line containing the side of the oil hole 7 and the first guide hole 8 away from the axis of the first end core 1 is parallel to the first guide plate 9, and the distance is H1, that is, the width of the first oblique oil channel is H1.
[0032] The second end core 3 includes a fourth lamination, a fifth lamination, and a sixth lamination, wherein the fourth lamination is attached to the central core 2; the fourth lamination includes multiple fourth laminations 11 stacked together, the fifth lamination includes multiple fifth laminations 12 stacked together, and the sixth lamination includes multiple sixth laminations 13 stacked together. The fourth lamination 11 has at least one first slot 14 circumferentially located near its outer edge, and the first slot 14 penetrates the outer edge of the third lamination 6. The fifth lamination 12 has a second guide hole 15 corresponding to the first slot 14, and a second guide piece 16 is provided within the second guide hole 15. One end of the second guide piece 16 is connected to the side of the second guide hole 15 away from the axis of the fifth lamination 12, and the other end is inclined and extends away from the central core 2. In practice, the second guide piece 16 is formed by stamping the fifth lamination 11, making the second guide piece 16 and the fifth lamination 11 integrally formed. The sixth lamination 13 is provided with a second slot 17 at the position corresponding to the first slot 14. The second slot 17 penetrates the outer edge of the sixth lamination 13, and its side near the axis of the sixth lamination 13 is located on the inner side of the second guide hole 15 near the axis of the fifth lamination 12. After the laminations are stacked, a second oblique oil passage is formed between the second guide plate 16, the first slot 14, the second guide hole 15, and the side of the second slot 17 near the axis of the second end core 3. The distances between the side of the first slot 14 near the second end core 3, the side of the second guide hole 15 near the second end core 3, and the side of the second slot 17 near the second end core 3 and the axis of the second end core 3 gradually decrease. Thus, the angle between the end face of the second guide plate 16 and the end face of the second end core 3 is θ1, and the angle between the straight line containing the side of the first slot 14, the second guide hole 15, and the second slot 17 near the axis of the second end core 3 and the end face of the second end core 3 is θ2. Preferably, θ1 = θ2, that is, the straight line containing the side of the first slot 14, the second guide hole 15, and the second slot 17 near the axis of the second end core 3 is parallel to the second guide plate 16 and the distance between them is H2, that is, the width of the first oblique oil passage is H2.
[0033] The central core 2 includes a central lamination, which comprises several seventh laminations 18 stacked together. Around the outer edge of each seventh lamination 18, several protrusions 19 are arranged. These protrusions 19 on the seventh laminations 18 are staggered or alternately distributed, or the protrusions 19 on adjacent seventh laminations 18 are overlapped and then staggered or alternately distributed. Grooves are formed between adjacent protrusions 19 or between corresponding protrusions 19. During assembly, adjacent or partially adjacent seventh laminations 18 can be rotated by a certain angle before being stacked to complete the assembly, which is convenient, quick, and efficient.
[0034] During operation, cooling oil is introduced through the inlet pipe 21 in the middle of the motor housing 20. The cooling oil first enters the outer oil channel formed between the central iron core 2 and the stator housing, and then flows along the axial and circumferential directions of the stator to cool the central iron core 2. Figure 4 Schematic diagram of stator outer peripheral cooling oil flow; after the cooling oil fills the entire stator outer oil passage, cooling oil continues to flow in, and finally the cooling oil is sprayed onto the end windings through the oblique oil passages, such as... Figure 2 , Figure 6 A schematic diagram of oil spraying at the stator end is shown, which cools the winding. This solution achieves the oil spraying cooling effect simply by designing the structure of the stator core.
[0035] In this design, the stator core oil channel structure is simple. It achieves stator end spraying functionality solely through the addition of through holes, slots, guide plates, and protrusions 19 to different core laminations, along with the stacking of the laminations. No other auxiliary parts are required. Furthermore, the overall assembly is convenient, efficient, and stable. The central core 2 has staggered protrusions on its outer periphery, increasing the core's heat dissipation area and further improving the stator core's cooling efficiency. For different motor cooling requirements, simply setting different numbers of angled oil channels on the end cores, with each channel set at different angles, can satisfy spraying needs at different positions on the end windings. This significantly improves the versatility of the entire stator structure.
[0036] This solution eliminates parts such as the oil injection ring, sealing ring, oil injection pipe, and fastening screws, and also eliminates the assembly process of several parts. By only adjusting the structure of the laminations, it not only achieves the end winding spraying function, but also directly reduces the material procurement cost and material management cost of the motor, while increasing the production cycle of the motor assembly, improving the reliability of the motor assembly, and reducing the failure probability of the motor assembly.
[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.
Claims
1. A stator structure for a new energy vehicle motor, characterized in that: The device includes a first end core, a middle core, and a second end core. The first end core has at least one first oblique oil passage at its end, and the second end core has at least one second oblique oil passage at its end. One end of the first and second oblique oil passages passes through the end faces of the first and second end cores, respectively, while the other end extends towards the middle core and outwards from the first and second end cores, until it passes through one end of the first and second end cores near the middle core and the outer side. On the outer side of the middle core, several interconnected grooves are distributed around it. After the middle core is assembled with the motor housing, several external oil passages are formed between the grooves and the motor housing, and the external oil passages are simultaneously connected to the first and second oblique oil passages.
2. The stator structure of a new energy vehicle motor according to claim 1, characterized in that: The first end core includes a first lamination, a second lamination, and a third lamination, wherein the third lamination is attached to the central core; the first lamination includes multiple first laminations stacked together, the second lamination includes multiple second laminations stacked together, and the third lamination includes multiple third laminations stacked together; the first lamination has at least one oil hole circumferentially located near its outer edge, and the second lamination has a first guide hole corresponding to the oil hole, the guide hole containing a first guide piece, one end of the first guide piece being connected to the side of the first guide hole near the axis of the second lamination, and the other side being inclined and extending towards the central core; the third lamination has an opening groove corresponding to the oil hole, the opening groove penetrating the outer edge of the third lamination, and its side near the axis of the second lamination being located inside the end of the first guide piece connected to the first guide hole.
3. The stator structure of a new energy vehicle motor according to claim 1, characterized in that: The second end core includes a fourth lamination, a fifth lamination, and a sixth lamination, wherein the fourth lamination is attached to the central core; the fourth lamination includes multiple fourth laminations stacked together, the fifth lamination includes multiple fifth laminations stacked together, and the sixth lamination includes multiple sixth laminations stacked together; the fourth lamination has at least one first slot along the circumferential direction near its outer edge, and the first slot penetrates the outer edge of the third lamination; the fifth lamination has a second guide hole corresponding to the position of the first slot, and a second guide piece is provided in the second guide hole, one end of which is connected to the side of the second guide hole away from the axis of the fifth lamination, and the other end is inclined and extends away from the central core; the sixth lamination has a second slot corresponding to the position of the first slot, and the second slot penetrates the outer edge of the sixth lamination, with its side near the axis of the sixth lamination located inside the side of the second guide hole near the axis of the fifth lamination.
4. The stator structure of a new energy vehicle motor according to claim 1, characterized in that: The central core includes a central lamination, which includes several seventh laminations stacked together. On the outer edge of the seventh lamination, several protrusions are arranged around it. The protrusions on the seventh lamination are staggered or alternately distributed, or the protrusions on several adjacent seventh laminations overlap and are then staggered or alternately distributed. The groove is formed between two adjacent protrusions or between two protrusions at corresponding positions.
5. The stator structure of a new energy vehicle motor according to claim 1, characterized in that: The first and second inclined oil channels are both multiple channels that are evenly distributed around the first and second end iron cores, respectively.
6. The stator structure of a new energy vehicle motor according to claim 1, characterized in that: The first and second inclined oil passages are arranged opposite each other or staggered.