Stator structure of oil-cooled motor and oil-cooled motor

Abstract

The utility model discloses an oil cooling motor stator structure and an oil cooling motor, relating to the motor technology field, the oil cooling motor stator structure comprises a stator iron core and a stator winding, the inner wall of the stator iron core is provided with a plurality of stator grooves, the stator winding is inserted in the stator grooves, and stator teeth are arranged between two adjacent stator grooves. Oil grooves are formed in the stator teeth, penetrate through the stator iron core and extend in the axial direction of the stator iron core.

Description

Technical Field

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

[0002] With continuous technological advancements, new energy vehicles have experienced rapid development. Improvements in battery technology have significantly enhanced driving range and charging speed, while advancements in intelligent driving technology have made vehicles more intelligent. Furthermore, the improvement of charging infrastructure has increased the practicality of new energy vehicles. Simultaneously, lightweight vehicle body technology and optimization of electric drive systems have further improved vehicle performance and efficiency. Advances in fast charging and wireless charging technologies have provided consumers with more flexible charging options. The integration and innovation of these technologies have jointly propelled the new energy vehicle industry forward, providing a solid technological foundation for achieving green travel and intelligent transportation.

[0003] Currently, new energy vehicle motors face high requirements such as small size, light weight, high power density, and high torque density. Furthermore, most mass-produced motors on the market use water cooling, with some using oil cooling. However, in oil-cooled motors, the cooling spray is applied to the winding ends, causing the temperature inside the stator slots to be higher than that at the winding ends. This uneven cooling leads to low drive system efficiency and excessively rapid temperature rise in the motor components, which is detrimental to market demand. Utility Model Content

[0004] The main purpose of this invention is to propose an oil-cooled motor stator structure and an oil-cooled motor, which aims to improve the heat dissipation effect of the motor.

[0005] To achieve the above objectives, the present invention proposes an oil-cooled motor stator structure, comprising a stator core and a stator winding. The inner wall of the stator core has a plurality of stator slots, and a stator winding is inserted into a stator slot. Stator teeth are provided between adjacent stator slots, and oil grooves are formed on the stator teeth. Each oil groove penetrates the stator core and extends along the axial direction of the stator core.

[0006] In one embodiment, the oil groove has a tapered cross-sectional shape, and the width of the oil groove gradually decreases along the direction close to the axis of the stator core.

[0007] In one embodiment, the oil groove extends into the portion between two adjacent stator slots at one end near the stator core shaft.

[0008] In one embodiment, the oil tank has a rectangular cross-sectional shape.

[0009] In one embodiment, the corners of the oil tank are provided with transition rounded corners.

[0010] This utility model also proposes an oil-cooled motor, which includes an oil-cooled motor stator structure, and

[0011] chassis;

[0012] End cap;

[0013] An oil baffle ring is provided. The housing and the end cover enclose a mounting cavity. The oil-cooled motor stator structure is located in the mounting cavity. The oil baffle ring is sleeved on the outer periphery of the stator core. The outer peripheral wall of the oil baffle ring and the inner peripheral wall of the housing form a liquid passage space. The liquid passage space is connected to the oil tank.

[0014] In one embodiment, the housing has a liquid inlet and a liquid outlet, which are respectively located on two radial sides of the housing, and the liquid inlet and the liquid outlet communicate with the mounting cavity.

[0015] In one embodiment, the sidewall of the oil baffle ring has a through hole that connects the inner and outer sides of the oil baffle ring.

[0016] This invention proposes an oil-cooled motor stator structure. Multiple stator slots are formed on the inner wall of the stator core for mounting the stator windings. This design allows for a tight fit between the stator windings and the stator slots, ensuring the stability and mechanical strength of the stator structure. Simultaneously, multiple axially extending oil grooves are formed on the stator teeth, facilitating oil flow within the stator and achieving effective cooling. This structural design allows the oil to directly contact the stator core, improving cooling efficiency and reducing heat damage to the stator core caused by motor operation, thus extending the motor's service life. By placing the oil grooves between adjacent stator slots, space can be utilized more effectively while ensuring the continuity of the oil flow path, thereby improving cooling efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the motor provided by this utility model;

[0019] Figure 2 for Figure 1 A schematic diagram of an embodiment of the stator structure of a Sinopec refrigerated motor;

[0020] Figure 3 for Figure 2 Schematic diagram of the middle stator core;

[0021] Figure 4 A schematic diagram of another embodiment of the stator core provided by this utility model;

[0022] Figure 5 This is a schematic diagram of another embodiment of the stator core provided by this utility model.

[0023] Explanation of icon numbers:

[0024] 1000. Oil-cooled motor; 1. Stator structure of oil-cooled motor; 11. Stator core; 111. Stator slot; 112. Oil trough; 113. Stator teeth; 12. Stator winding; 2. Housing; 21. Liquid inlet; 22. Liquid outlet; 3. End cover; 4. Oil retaining ring.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] 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 embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] With continuous technological advancements, new energy vehicles have experienced rapid development. Improvements in battery technology have significantly enhanced driving range and charging speed, while advancements in intelligent driving technology have made vehicles more intelligent. Furthermore, the improvement of charging infrastructure has increased the practicality of new energy vehicles. Simultaneously, lightweight vehicle body technology and optimization of electric drive systems have further improved vehicle performance and efficiency. Advances in fast charging and wireless charging technologies have provided consumers with more flexible charging options. The integration and innovation of these technologies have jointly propelled the new energy vehicle industry forward, providing a solid technological foundation for achieving green travel and intelligent transportation.

[0030] Currently, new energy vehicle motors face high requirements such as small size, light weight, high power density, and high torque density. Furthermore, most mass-produced motors on the market use water cooling, with some using oil cooling. However, in oil-cooled motors, the cooling spray is applied to the winding ends, causing the temperature inside the stator slots to be higher than that at the winding ends. This uneven cooling leads to low drive system efficiency and excessively rapid temperature rise in the motor components, which is detrimental to market demand.

[0031] To solve the above problems, please refer to... Figures 1 to 5 This utility model proposes an oil-cooled motor stator structure 1, including a stator core 11 and a stator winding 12. The inner wall of the stator core 11 has a plurality of stator slots 111, and a stator winding 12 is inserted into a stator slot 111. A stator tooth 113 is provided between two adjacent stator slots 111, and an oil groove 112 is formed on the stator tooth 113. Each oil groove 112 passes through the stator core 11 and extends along the axial direction of the stator core 11.

[0032] This utility model proposes an oil-cooled motor stator structure 1. The inner wall of the stator core 11 forms multiple stator slots 111 for mounting the stator windings 12. This design allows the stator windings 12 to be tightly integrated with the stator slots 111, ensuring the stability and mechanical strength of the stator structure. Simultaneously, multiple axially extending oil grooves 112 are formed on the stator teeth 113, facilitating the flow of oil within the stator and achieving effective cooling. This allows the oil to directly contact the stator core, improving cooling efficiency and reducing the damage to the stator core caused by heat generated during the operation of the oil-cooled motor 1000, thus extending the service life of the oil-cooled motor 1000. By designing the oil grooves 112 between adjacent stator slots 111, space can be utilized more effectively, while ensuring the continuity of the oil flow path, thereby improving cooling efficiency.

[0033] In an optional embodiment, to improve the cooling effect of the oil tank 112, please refer to... Figures 1 to 3 The oil groove 112 has a conical cross-section, and its width gradually decreases towards the axis of the stator core 11. This conical design facilitates the flow of oil within the oil groove 112. The tapered shape makes the oil flow smoother, reducing resistance and improving cooling efficiency. Simultaneously, this design also contributes to the uniform distribution of oil within the oil groove 112, resulting in more even cooling and preventing localized overheating, thus improving the reliability and stability of the oil-cooled motor 1000. The conical structure also helps to create a natural guiding effect during oil flow, allowing the oil to more effectively carry away heat, especially under high loads. Furthermore, the conical shape of the oil groove 112 ensures that the wall thickness of the stator core 11 remains as consistent as possible. This guarantees sufficient strength for the stator core 11 while allowing the oil groove 112 to cool the surrounding area evenly, thus ensuring effective oil cooling.

[0034] In an optional embodiment, the end of the oil trough 112 near the axis of the stator core 11 extends into the area between the two stator slots of the circuit. This design allows the oil trough 112 to contact the stator core more deeply, increasing the contact area between the oil and the stator core, thereby improving cooling efficiency. Furthermore, this design facilitates oil flow within the stator teeth 113, resulting in more uniform cooling, reducing heat buildup during operation of the oil-cooled motor 1000, and improving the operating efficiency and stability of the oil-cooled motor 1000. By designing the oil trough 112 to extend between the stator teeth, the main heat-generating areas can be cooled more directly; this targeted cooling design helps improve the overall performance and lifespan of the oil-cooled motor 1000.

[0035] In another alternative embodiment, please refer to Figure 4The oil tank 112 has a rectangular cross-sectional shape. This rectangular design simplifies the manufacturing process and reduces production costs. Simultaneously, the straight edges of the rectangular oil tank 112 facilitate oil flow within it, reducing flow resistance and improving cooling efficiency. This design also standardizes the dimensions of the oil tank 112, making maintenance and replacement easier and improving the maintainability of the oil-cooled motor 1000. Furthermore, the rectangular oil tank 112 design simplifies the oil flow path, making the flow more direct and efficient, thereby improving the overall performance of the cooling system. For other embodiments, please refer to... Figure 5 The cross-section of the oil tank 112 can also be a trapezoidal structure, which can be selected according to actual needs.

[0036] In an optional embodiment, the included angles of the oil groove 112 are provided with transition fillets. The design of the transition fillets helps reduce stress concentration at the included angles of the oil groove 112, thereby reducing the risk of cracks and fatigue damage caused by stress concentration. The design of the transition fillets makes the geometry of the oil groove 112 smoother, which not only facilitates the flow of oil in the oil groove 112 and reduces flow resistance, but also helps improve the overall mechanical strength and durability of the stator core. Furthermore, the smooth transition fillets also help reduce the processing difficulty during manufacturing and improve production efficiency. The design of the transition fillets also helps reduce turbulence and noise during oil flow, thereby improving the operational smoothness and noise control of the oil-cooled motor 1000.

[0037] This utility model also proposes an oil-cooled motor 1000, which includes a housing 2, an end cover 3, an oil baffle ring 4, and an oil-cooled motor stator structure 1. The specific structure of the oil-cooled motor stator structure 1 is as described in the above embodiments. Since this oil-cooled motor 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here. Please refer to... Figure 1An oil baffle ring 4 is fitted around the outer periphery of the stator core 11. The outer peripheral wall of the oil baffle ring 4 forms a liquid passage space with the inner peripheral wall of the housing 2, and this liquid passage space communicates with the oil trough 112. This design, through the mounting cavity formed by the housing 2 and the end cover 3, provides a stable working environment for the stator structure 1 of the oil-cooled motor. The oil baffle ring 4, fitted around the outer periphery of the stator core 11, forms a liquid passage space with the inner peripheral wall of the housing 2. This space communicates with the oil trough 112, allowing cooling oil to flow inside the oil-cooled motor 1000, achieving effective cooling of the stator core. This structural design allows the heat generated by the oil-cooled motor 1000 during operation to be quickly carried away by the flow of oil, thereby maintaining a stable operating temperature of the oil-cooled motor 1000. Because the oil directly contacts the heat-generating components, this direct cooling method is more efficient than traditional air cooling and can significantly improve the thermal management capability of the oil-cooled motor 1000. Furthermore, this design reduces the size and weight of the oil-cooled motor 1000, making the oil-cooling system more compact compared to traditional cooling systems. Overall, this oil-cooled motor 1000 structure, through the integration of an oil-cooled stator and a specific housing 2 design, provides an efficient and compact cooling solution that helps improve the performance and reliability of the oil-cooled motor 1000.

[0038] In an alternative embodiment, please refer to Figures 1 to 3 The housing 2 has an inlet 21 and an outlet 22, located on opposite radial sides of the housing 2, and both inlet and outlet communicate with the mounting cavity. The design of the inlet 21 and outlet 22 allows oil to enter and exit the oil-cooled motor 1000 uniformly, ensuring uniform cooling and reducing pressure loss during oil flow. This design improves the cooling efficiency of the oil-cooled motor 1000, reduces heat buildup during operation, and thus enhances its performance and lifespan. By providing two outlets on the housing 2, smoother oil flow within the oil-cooled motor 1000 is ensured, preventing oil stagnation in localized areas and reducing temperature unevenness within the motor. This design also helps reduce energy consumption in the oil circulation system, as the oil flows at lower pressures, reducing the energy required for pumping the oil. Furthermore, this design reduces noise in the oil circulation system because the reduced resistance to oil flow decreases turbulence and noise generated during oil flow. Overall, this design improves the cooling efficiency and operational stability of the oil-cooled motor 1000 by optimizing the oil flow path, while also reducing energy consumption and noise.

[0039] In an optional embodiment, the sidewall of the oil baffle ring 4 has a through hole connecting the inner and outer sides of the oil baffle ring 4. This design allows the oil to flow freely on both sides of the oil baffle ring 4, improving the efficiency of oil circulation. The presence of the through hole helps balance the pressure on both sides of the oil baffle ring 4, reducing the resistance to oil flow and thus improving the efficiency of the entire oil-cooled motor 1000 cooling system. Furthermore, this design helps reduce air bubbles that may be generated during oil circulation, which could affect the cooling effect. By optimizing the oil flow path, this design helps improve the cooling performance of the oil-cooled motor 1000, ensuring that the oil-cooled motor 1000 maintains optimal performance under various operating conditions. The through hole design also helps reduce oil stagnation inside the oil baffle ring 4, thus avoiding the problem of oil overheating in localized areas. This design also reduces energy consumption in the oil circulation system because the oil can flow at lower pressures, reducing the energy required to pump the oil. In summary, this design optimizes the flow path of the oil by forming through holes on the sidewalls of the oil baffle ring 4, thereby improving the cooling efficiency and operational stability of the oil-cooled motor 1000, while also reducing energy consumption.

[0040] The following describes the movement path of the cooling oil in the oil-cooled motor 1000 in this solution: Please refer to... Figure 1 Cooling oil enters from the upper left inlet 21 of the housing 2 into the oil cavity composed of the housing 2, stator core 11, oil baffle ring 4, and end plate. It is sprayed onto the ends of the windings through the through-holes in the oil baffle ring 4 to cool the windings. The oil flows through the oil trough 112 to the oil cavity at the other end of the oil-cooled motor 1000, and then sprays onto the winding ends through the oil baffle ring 4 at the other radial end of the oil-cooled motor 1000. Finally, it flows out of the oil-cooled motor 1000 through the outlet 22 at the lower right corner of the housing 2, thus achieving subsequent circulation of the cooling oil. This solution solves the problem of excessively high temperature in the stator slots during the operation of the oil-cooled motor 1000, and also solves the problem of excessively rapid temperature rise in the oil-cooled motor 1000, thereby increasing system efficiency.

[0041] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A stator structure for an oil-cooled motor, characterized in that, It includes a stator core and a stator winding. The inner wall of the stator core has a plurality of stator slots. A stator winding is inserted into a stator slot. Stator teeth are provided between two adjacent stator slots. Oil grooves are formed on the stator teeth. Each oil groove passes through the stator core and extends along the axial direction of the stator core.

2. The oil-cooled motor stator structure as described in claim 1, characterized in that, The oil groove has a tapered cross-sectional shape, and the width of the oil groove gradually decreases along the direction close to the axis of the stator core.

3. The oil-cooled motor stator structure as described in claim 2, characterized in that, The oil groove extends into the area between two adjacent stator slots at one end near the stator core shaft.

4. The oil-cooled motor stator structure as described in claim 1, characterized in that, The oil tank has a rectangular cross-sectional shape.

5. The oil-cooled motor stator structure as described in claim 1, characterized in that, All corners of the oil tank are provided with rounded transition corners.

6. An oil-cooled motor, characterized in that, Including the oil-cooled motor stator structure as described in any one of claims 1 to 5, and chassis; End cap; An oil baffle ring is provided. The housing and the end cover enclose a mounting cavity. The oil-cooled motor stator structure is located in the mounting cavity. The oil baffle ring is sleeved on the outer periphery of the stator core. The outer peripheral wall of the oil baffle ring and the inner peripheral wall of the housing form a liquid passage space. The liquid passage space is connected to the oil tank.

7. The oil-cooled motor as described in claim 6, characterized in that, The housing has a liquid inlet and a liquid outlet, which are located on opposite sides of the housing in the radial direction. The liquid inlet and the liquid outlet are connected to the mounting cavity.

8. The oil-cooled motor as described in claim 7, characterized in that, The sidewall of the oil baffle ring has a through hole, which connects the inner and outer sides of the oil baffle ring.

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