Three-phase copper bar cooling structure, driving motor and electric driving assembly

Abstract

The utility model discloses a three-phase copper bar cooling structure, a driving motor and an electric driving assembly, and the structure comprises a cooling oil path which is formed in a housing and forms a loop oil path. The branch oil pipe is fixedly connected with one end, close to the three-phase copper bar, of the shell, the branch oil pipe is formed in the shell, a cooling hole is formed in the branch oil pipe in the radial direction, and an oil way where cooling oil makes contact with the three-phase copper bar through the cooling hole is a part of a cooling oil way. According to the utility model, the branch oil pipes close to the three-phase copper bars are arranged to convey cooling oil, so that the cooling oil in the branch oil pipes flows to the three-phase copper bars through the cooling holes to cool the three-phase copper bars, and the branch oil pipes are formed in the shell so that the relative positions between the cooling holes and the three-phase copper bars are fixed; the cooling oil in the branch oil pipe is cooled through the shell, the structural complexity of the oil tank is lowered, and then the probability of failures of the oil tank is lowered.

Description

Technical Field

[0001] This utility model relates to the field of drive motor technology, specifically to a three-phase copper busbar cooling structure, a drive motor, and an electric drive assembly. Background Technology

[0002] In new energy vehicles, the three-phase copper busbar structure of the drive motor is a key component connecting the inverter and the motor stator winding. Its basic functions include: transmitting the three-phase AC power output from the inverter to the stator winding of the motor, conducting heat away from the motor winding, managing electromagnetic compatibility, and fixing the relative position between the drive motor and the inverter.

[0003] Existing three-phase copper busbar cooling designs include natural cooling via convection and radiation, and cooling via airflow driven by a fan-cooled system. However, these cooling methods are inefficient and cannot effectively dissipate the heat generated at the three-phase copper busbar by the increasingly powerful drive motor, making it difficult to maintain the drive motor within a safe operating temperature range, thus reducing its efficiency and lifespan. Utility Model Content

[0004] This utility model addresses the problem of low cooling efficiency in existing three-phase copper busbar cooling structures by providing a three-phase copper busbar cooling structure, a drive motor, and an electric drive assembly. The specific technical solution is as follows:

[0005] A three-phase copper busbar cooling structure is provided inside a drive motor. The drive motor includes a housing and a three-phase copper busbar placed at one end of the housing. The three-phase copper busbar cooling structure includes: a cooling oil passage for conveying cooling oil, the cooling oil passage being formed inside the housing and forming a loop oil passage; and a branch oil pipe fixedly connected to one end of the housing near the three-phase copper busbar, the branch oil pipe being formed inside the housing, the branch oil pipe forming cooling holes radially, and the oil passage through which the cooling oil contacts the three-phase copper busbar is part of the cooling oil passage.

[0006] Furthermore, the shell and branch oil pipes are machined as a single unit.

[0007] Preferably, the drive motor further includes a stator and a rotor; the cooling oil circuit includes: a main oil circuit for cooling the stator and rotor; and a branch oil circuit for cooling the three-phase copper busbars, wherein the cooling oil transported inside the branch oil pipe forms the branch oil circuit, and the branch oil circuit and the main oil circuit are connected to form a loop oil circuit.

[0008] Preferably, the cooling holes are evenly distributed along the axial direction of the branch oil pipe, the axis of the cooling holes intersects with the three-phase copper busbar, and the diameter of the cooling holes is 0.9-1.1 mm.

[0009] Preferably, the present invention further includes an oil pump and an oil cooler disposed on the housing. The oil pump drives the cooling oil to flow along the main oil passage and branch oil passages through the oil cooler, and the oil cooler cools the cooling oil.

[0010] A drive motor includes the aforementioned three-phase copper busbar cooling structure.

[0011] An electric drive assembly, including a drive motor.

[0012] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0013] This invention delivers cooling oil via a branch oil pipe located near the three-phase copper busbar. The cooling oil in the branch oil pipe flows through cooling holes to the three-phase copper busbar for cooling. The branch oil pipe is formed inside the casing, which keeps the relative position between the cooling holes and the three-phase copper busbar fixed. This allows the cooling oil in the branch oil pipe to dissipate heat through the casing, reducing the structural complexity of this invention and thus reducing the probability of failure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0015] Figure 2 for Figure 1 Enlarged view of the structure at point A in the image.

[0016] In the diagram: 1. Housing; 2. Branch oil pipe; 3. Cooling hole; 4. Oil pump; 5. Oil cooler; 6. Cooling oil circuit; 61. Main oil circuit; 62. Branch oil circuit; 7. Three-phase copper busbar. Detailed Implementation

[0017] The technical solution of Embodiment 1 of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described Embodiment 1 is only a part of Embodiment 1 of this utility model, and not all of Embodiment 1. Based on Embodiment 1 of this utility model, all other Embodiment 1 obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when 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.

[0019] Example 1

[0020] like Figure 1 As shown, this embodiment is used to cool the three-phase copper busbar 7 on the drive motor. The drive motor includes a housing 1, a three-phase copper busbar 7 placed at one end of the housing 1, a stator, and a rotor.

[0021] Specifically, both the stator and rotor are rotatably connected to the through hole in the middle of the housing 1. The stator is connected to AC power through the three-phase copper busbar 7 fixedly connected to the left end of the housing 1, thereby driving the rotor to output torque from the right end of the housing 1. The three-phase copper busbar 7 generates heat due to the current passing through it, which increases the operating temperature of the stator and rotor.

[0022] Combination Figure 2 As shown, this embodiment also includes: a cooling oil passage 6 for conveying cooling oil, the cooling oil passage 6 being formed inside the housing 1 and forming a loop oil passage; and a branch oil pipe 2 disposed at one end of the housing 1 near the three-phase copper busbar 7, the branch oil pipe 2 being formed inside the housing 1, the branch oil pipe 2 forming cooling holes 3 in the radial direction, and the oil passage through which the cooling oil contacts the three-phase copper busbar 7 through the cooling holes 3 being part of the cooling oil passage 6.

[0023] Specifically, the interior of the housing 1 forms a cavity for accommodating the stator and rotor, and the interior of the housing wall of the housing 1 forms a cooling oil passage 6 for the flow of cooling oil. The cooling oil passage 6 enters the components that need to be cooled through the housing 1, thereby reducing the operating temperature of the drive motor and improving its working efficiency and service life. Furthermore, the two ends of the cooling oil passage 6 are connected, which allows the cooling oil used for cooling to be circulated repeatedly, thereby improving the utilization rate of the cooling oil.

[0024] Secondly, the branch oil pipe 2 is formed inside the left end shell wall of the housing 1 or the shell wall of the end cap, and it is connected to the cooling oil passage 6, so that the cooling oil can flow along the branch oil pipe 2. The axial side of the branch oil pipe facing the three-phase copper busbar 7 has a cooling hole 3, so that the cooling oil in the branch oil pipe 2 can flow out from the cooling hole 3 and then flow to the three-phase copper busbar 7 for cooling. Secondly, the cooling oil always flows inside the shell wall, making its flow path relatively stable. Thus, even in extreme situations such as strong vibration during the operation of this embodiment, the cooling hole 3 is always aligned with the three-phase copper busbar 7, so the cooling oil can always flow to the three-phase copper busbar 7 for cooling. Thirdly, the flow path of the cooling oil along the branch oil pipe 2 is part of the cooling oil passage 6, that is, the cooling oil flowing to the three-phase copper busbar 7 for cooling can also be recycled.

[0025] Furthermore, the shell 1 and the branch oil pipe 2 are integrally machined.

[0026] Specifically, the housing 1 and the branch oil pipe 2 are formed simultaneously through casting, milling, and other processes, resulting in a tight connection between the branch oil pipe 2 and the housing 1, ensuring that their relative positions remain unchanged. Furthermore, the cooling oil can transfer some heat to the housing 1 through the branch oil pipe 2. The larger contact area between the housing 1 and the air enhances the cooling effect of the oil, thereby enabling faster heat transfer from the three-phase copper busbar 7, reducing its operating temperature, and extending its service life. Additionally, the integrated machining process reduces the structural complexity of this embodiment, thereby decreasing the probability of failure and improving its reliability.

[0027] Furthermore, the cooling oil circuit 6 includes: a main oil circuit 61 for cooling the stator and rotor; and a branch oil circuit 62 for cooling the three-phase copper busbar 7. The cooling oil transported inside the branch oil pipe 2 forms the branch oil circuit 62, and the branch oil circuit 62 and the main oil circuit 61 are connected to form a loop oil circuit.

[0028] As is common knowledge, most of the heat generated during the operation of the drive motor is generated between the stator and the rotor. The cooling oil comes into contact with the stator and rotor along the main oil circuit 61, thereby cooling them and reducing the operating temperature of the stator and rotor.

[0029] Secondly, the branch oil pipe 2 forms a pipeline for transporting cooling oil. Its right end is connected to the main oil circuit 61, allowing the cooling oil in the main oil circuit 61 to enter the branch oil pipe 2 and flow to form the branch oil circuit 62. When the branch oil circuit 62 flows through the cooling hole 3, it flows out of the branch oil pipe 2 and flows to the three-phase copper busbar 7 for cooling. Then, it enters the main oil circuit 61 through the gap in the housing 1, forming a loop oil circuit that simultaneously cools the stator, rotor, and three-phase copper busbar 7, i.e., the cooling oil circuit 6, thereby improving the cooling efficiency and cooling oil utilization rate.

[0030] Secondly, the connection point between the branch oil passage 62 and the main oil passage 61 is located inside the shell wall, which improves the sealing of the connection point and reduces the possibility of contamination caused by the cooling oil communicating with the outside.

[0031] Furthermore, the cooling holes 3 are evenly distributed along the axial direction of the branch oil pipe 2, and the axis of the cooling holes 3 intersects with the three-phase copper busbar 7.

[0032] Specifically, in this embodiment, the branch oil pipe 2 forms three cooling holes 3. The axis of each cooling hole 3 passes through the three-phase copper busbar 7. The direction of this axis is the direction in which the cooling oil flows out of the branch oil passage 62. This allows the cooling oil flowing out of the branch oil pipe 2 to come into contact with the three-phase copper busbar 7 and cool it down. This avoids the cooling oil not being able to come into contact with the three-phase copper busbar 7, which would result in a large amount of cooling oil not being able to cool and reduce the cooling effect of the cooling oil.

[0033] Furthermore, the diameter of the cooling hole 3 is 0.9-1.1 mm.

[0034] Specifically, the diameter of the cooling hole 3 is related to the diameter of the branch oil pipe 2. In this embodiment, it is 1 mm, which increases the flow rate of the cooling oil in the branch oil pipe 2 when it flows out of the cooling hole 3. That is, it reduces the cross-sectional area of ​​the cooling oil flow, thereby increasing the flow rate. This allows the cooling oil to fully contact the three-phase copper busbar 7, preventing the three-phase copper busbar 7 that is far from the cooling hole 3 from being uncooled.

[0035] Furthermore, this embodiment also includes an oil pump 4 and an oil cooler 5 disposed on the housing 1. The oil pump 4 pushes the cooling oil along the main oil passage 61 and the branch oil passage 62 through the oil cooler 5, and the oil cooler 5 cools the cooling oil.

[0036] Specifically, the oil pump 4 and the oil cooler 5 are fixedly connected to the outer surface of the housing 1 by bolts, and both are connected to the cooling oil circuit 6. This allows the oil pump 4 to guide the cooling oil that has absorbed heat and increased in temperature to the oil cooler 5 for cooling, and then to reintroduce the cooled cooling oil into the cooling oil circuit 6 to cool the stator, rotor and three-phase copper busbar 7.

[0037] Example 2

[0038] The drive motor, in embodiment one, conducts its own internal heat, thereby reducing its operating temperature, improving working efficiency, and extending its service life.

[0039] Example 3

[0040] Embodiment 2 provides an electric drive assembly capable of regulating its own operating temperature, thereby improving its service life.

[0041] Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0042] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A three-phase copper bar cooling structure provided in a drive motor, the drive motor comprising a housing (1) and a three-phase copper bar (7) placed at one end of the housing (1), characterized in that, The three-phase copper bar cooling structure comprises: a cooling oil path (6) for conveying cooling oil, which is formed in the interior of the shell (1) and forms a loop oil path; and a branch oil pipe (2) fixedly connected to the shell (1) near one end of the three-phase copper bar (7), which is formed in the interior of the shell (1), and the branch oil pipe (2) forms cooling holes (3) in the radial direction, and the cooling oil path (6) is part of the cooling oil path (6) through which the cooling oil contacts the three-phase copper bar (7).

2. The three-phase copper bar cooling structure according to claim 1, characterized by: The shell (1) and the branch oil pipe (2) are integrally processed and formed.

3. The three-phase copper bar cooling structure of claim 2, wherein: The driving motor further comprises a stator and a rotor; The cooling oil path (6) comprises: a main oil path (61) for cooling the stator and the rotor; and a branch oil path (62) for cooling the three-phase copper bar (7), the cooling oil conveyed in the interior of the branch oil pipe (2) forming the branch oil path (62), and the branch oil path (62) and the main oil path (61) being in communication to form the loop oil path.

4. The three-phase copper bar cooling structure of claim 3, wherein: The cooling holes (3) are uniformly distributed along the axial direction of the branch oil pipe (2), and the axes of the cooling holes (3) intersect the three-phase copper bar (7).

5. The three-phase copper bar cooling structure of claim 4, wherein: The diameter of the cooling holes (3) is 0.9-1.1 mm.

6. The three-phase copper bar cooling structure of claim 5, wherein: Further comprising an oil pump (4) and an oil cooler (5) arranged on the shell (1), the oil pump (4) pushing the cooling oil to flow through the oil cooler (5) along the main oil path (61) and the branch oil path (62), and the oil cooler (5) cooling the cooling oil.

7. A drive motor characterized by The driving motor comprises the three-phase copper bar cooling structure according to any one of claims 1 to 6.

8. An electric drive assembly, characterized by The electric drive assembly comprises the driving motor according to claim 7. The electric drive assembly comprises the driving motor according to claim 7.

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