High-efficiency oil-cooled motor

Abstract

This invention relates to a high-efficiency oil-cooled motor, comprising a housing, a front cover plate, a rear cover plate, a stator, a shaft, and a rotor core. The shaft is provided with an axial oil passage and a central radial oil passage. The rotor core is provided with a rotor oil passage. The front cover plate is provided with a cooling oil inlet B communicating with the axial oil passage. The housing's sidewall has water channels arranged spirally along its circumference. The housing's sidewall also has a water channel inlet and outlet connecting to a heat management water pump. Cooling oil pipes pass through the water channels. The housing's sidewall also has a cooling oil inlet A. The stator's outer wall has an annular groove oil passage. Cooling oil inlet A passes through the housing between two adjacent water channels and communicates with the annular groove oil passage. One end of the cooling oil pipe is inserted into the rear cover plate and communicates with the interior of the housing; the other end of the cooling oil pipe communicates with cooling oil inlet A and cooling oil inlet B. This invention's rational oil channel distribution design greatly improves the cooling effect of the rotor and stator, thereby improving the overall performance of the motor.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle motor technology, and more specifically, to a high-efficiency oil-cooled motor. Background Technology

[0002] Due to the requirements for overall vehicle weight and space, new energy vehicles place extremely high demands on the power density (torque density) of their drive motors. Furthermore, the increasing speed of automotive motors has become a recognized and inevitable trend among manufacturers. Embedded permanent magnet synchronous motors, with their wide speed range and high power density, have become the preferred type of automotive drive motor.

[0003] Automotive drive motors require high speeds, often reaching tens of thousands of revolutions per minute. Various losses generated during motor operation are converted into heat, causing the motor components to heat up and their temperatures to rise. The limits of this temperature rise directly affect the motor's lifespan; furthermore, the harmonic magnetic fields of the stator armature and rotor magnets both generate significant eddy current losses in the magnets, leading to further temperature increases in the magnets.

[0004] Although people have designed and manufactured many heat dissipation technologies, such as processing or installing heat dissipation ribs similar to radiator fins on the outer casing, adding fans, and spraying oil for cooling inside the motor, the above cooling methods can only cool the stator or rotor. In particular, it is difficult to cool the magnets built into the rotor core, which can lead to demagnetization of the magnets and thus affect the overall performance and service life of the motor. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a high-efficiency oil-cooled motor that can more fully cool the rotor.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A high-efficiency oil-cooled motor includes a housing, a front cover plate, a rear cover plate, a stator, a shaft, and a rotor core. The stator is disposed within the housing. The front and rear cover plates are fixed to both ends of the housing. The rotor core is mounted on the shaft, and both ends of the shaft are rotatably mounted on the front and rear cover plates via bearings. The shaft also has an axial oil passage running through it, and multiple radial oil passages connected to the axial oil passages. The rotor core also has multiple rotor oil passages extending from the center of the rotor core to both ends and the outer sides, and these rotor oil passages are connected to the corresponding radial oil passages. The front cover plate is also provided with a cooling oil inlet B, which is connected to the axial oil passage; the side wall of the housing is provided with a water channel arranged in a spiral along the circumference, and the side wall of the housing is also provided with a water channel inlet and a water channel outlet for connecting the heat management water pump. A cooling oil pipe is also passed through the water channel. The side wall of the housing is also provided with a cooling oil inlet A. The outer wall of the stator is also provided with an annular groove oil passage. The cooling oil inlet A passes through the housing between two adjacent water channels and is connected to the annular groove oil passage. One end of the cooling oil pipe is inserted into the rear cover plate and is connected to the inside of the housing. The other end of the cooling oil pipe is connected to the cooling oil inlet A and the cooling oil inlet B.

[0008] As a preferred embodiment, the central radial oil passages consist of four sections arranged in a cross shape.

[0009] As a preferred embodiment: an oil seal is provided between the end of the rotating shaft and the front cover plate, and an end radial oil passage is provided at one end of the rotating shaft, with the end radial oil passage located between the oil seal and the bearing.

[0010] As a preferred embodiment: the inner side of the front cover plate and the rear cover plate is provided with an arc-shaped annular groove, and the outer end of the rotor oil passage faces the arc-shaped annular groove.

[0011] As a preferred embodiment: there are multiple annular groove oil passages, which are arranged in parallel and spaced apart, and the outer wall of the stator is also provided with an axially connecting oil passage that connects the multiple annular groove oil passages.

[0012] As a preferred embodiment: the rear cover plate is also provided with a cooling oil outlet near the outer edge of the rear cover plate, the cooling oil pipe includes a cooling oil pipe section A and a cooling oil pipe section B, one end of the cooling oil pipe section A is connected to the cooling oil outlet and the other end is connected to the oil pump, the cooling oil pipe section B is installed in the water channel, and both ends are respectively inserted from the water channel inlet and the water channel outlet, and one end is connected to the oil pump.

[0013] As a preferred embodiment: the cooling oil pipe further includes cooling oil pipe section C, cooling oil pipe section D, and a tee pipe. Cooling oil pipe section B, cooling oil pipe section C, and cooling oil pipe section D are connected by the tee pipe, and cooling oil pipe section C and cooling oil pipe section D are respectively connected to cooling oil inlet A and cooling oil inlet B.

[0014] As a preferred embodiment: the water inlet and the water outlet are located at the upper and lower parts of the outer wall of the shell, respectively, and the water inlet is connected to the upper port of the waterway and the water inlet is connected to the lower port of the waterway.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] This invention provides cooling oil by incorporating a through-hole oil channel on the rotor shaft and distributing the cooling oil through multiple radial oil channels to various parts of the rotor core. This not only cools the entire rotor core but also indirectly cools the magnets mounted on it. Furthermore, the outer wall of the casing is equipped with water channels to cool the oil pipes, further improving cooling efficiency. Additionally, the stator has cooling oil channels on its outer wall, enabling faster cooling of the stator as well. This invention's rational oil channel distribution design significantly enhances the cooling effect of the rotor and stator, thereby improving the overall performance of the motor. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention from one angle;

[0019] Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle;

[0020] Figure 3 This is a schematic diagram of the axial cross-sectional structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the radial oblique section structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the stator sidewall structure of the present invention.

[0023] The attached diagram is labeled as follows: 1. Shell; 11. Cooling oil inlet A; 15. Water channel; 2. Front cover plate; 21. Cooling oil inlet B; 3. Rear cover plate; 31. Cooling oil outlet; 32. Arc-shaped annular groove; 4. Stator; 40. Stator core; 41. Annular groove oil channel; 42. Axial connecting oil channel; 43. Winding; 5. Shaft; 51. End radial oil channel; 52. Axial oil channel; 53. Middle radial oil channel; 6. Rotor core; 61. Rotor oil channel; 7. Oil seal; 100. Oil pump; 101. Cooling oil pipe section A; 102. Cooling oil pipe section B; 103. Cooling oil pipe section C; 104. Cooling oil pipe section D; 105. T-joint. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] Furthermore, in the description of this invention, 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 invention 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 invention.

[0027] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0028] In this invention, 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 invention according to the specific circumstances.

[0029] 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.

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0031] like Figures 1 to 3 The high-efficiency oil-cooled motor shown includes a housing 1, a front cover plate 2, a rear cover plate 3, a stator 4, a rotating shaft 5, and a rotor core 6. The stator 4 is disposed inside the housing 1. The front cover plate 2 and the rear cover plate 3 are respectively fixed to both ends of the housing 1. The rotor core 6 is disposed on the rotating shaft 5, and both ends of the rotating shaft 5 are rotatably mounted on the front cover plate 2 and the rear cover plate 3 via bearings. The rotating shaft 5 is also provided with an axial oil passage 52 penetrating the rotating shaft 5, and the rotating shaft 5 is also provided with multiple central radial oil passages 53, which are connected to the axial oil passages 52. There are four central radial oil passages 53, which are arranged in a cross shape. The rotor core 6 is also provided with multiple rotor oil passages 61 extending from the center of the rotor core 6 to both ends and the outer side, and the rotor oil passages 61 are connected to the corresponding central radial oil passages 53. The front cover plate 2 is also provided with a cooling oil inlet B21, which is connected to the axial oil passages 52.

[0032] The inner sides of the front cover plate 2 and the rear cover plate 3 are provided with an arc-shaped annular groove 32, and the outer end of the rotor oil passage 61 faces the arc-shaped annular groove 32. The cooling oil thrown out from the rotor oil passage 61 is guided by the arc-shaped annular groove 32, which can cause the cooling oil to be thrown towards the winding end, thus playing a certain cooling role on the winding end.

[0033] like Figure 3 As shown, furthermore, the side wall of the housing 1 is provided with a water channel 15 arranged spirally along the circumference. The side wall of the housing 1 is also provided with a water channel inlet and a water channel outlet connecting to the heat management water pump. Cooling oil pipes are also installed inside the water channel 15. Figure 4 and Figure 5As shown, the side wall of the housing 1 is also provided with a cooling oil inlet A11, and the outer wall of the stator 4 is also provided with an annular groove oil channel 41. The cooling oil inlet A11 passes through the housing 1 between two adjacent water channels 15 and is connected to the annular groove oil channel 41. One end of the cooling oil pipe is inserted into the rear cover plate 3 and is connected to the inside of the housing 1. The other end of the cooling oil pipe is connected to the cooling oil inlet A11 and the cooling oil inlet B21.

[0034] The specific structure of the cooling oil pipe is as follows: a cooling oil outlet 31 is provided on the rear cover plate 3 near the outer edge of the rear cover plate 3. The cooling oil pipe includes a cooling oil pipe section A 101 and a cooling oil pipe section B 102. One end of the cooling oil pipe section A 101 is connected to the cooling oil outlet 31, and the other end is connected to the oil pump 100. The cooling oil pipe section B 102 is installed in the water channel 15, and both ends are inserted from the water channel inlet and the water channel outlet, respectively, and one end is connected to the oil pump 100.

[0035] The cooling oil pipe also includes cooling oil pipe section C 103, cooling oil pipe section D 104 and tee pipe 105. Cooling oil pipe section B 102, cooling oil pipe section C 103 and cooling oil pipe section D 104 are connected by tee pipe 105, and cooling oil pipe section C 103 and cooling oil pipe section D 104 are respectively connected to cooling oil inlet A11 and cooling oil inlet B21.

[0036] Under the action of the oil pump, the cooling oil from the motor re-enters the water channels on the side wall of the casing for accelerated cooling before entering the shaft and stator. The stator has multiple annular groove oil channels 41, arranged in parallel and spaced intervals. The outer wall of the stator 4 also has axially connecting oil channels 42 that connect the multiple annular groove oil channels 41. Figure 5 As shown. The oil passage here can fully cool the stator and indirectly cool the windings in the stator, thus improving the motor's heat dissipation capacity.

[0037] The water inlet and outlet are located at the upper and lower parts of the outer wall of the casing, respectively. The water inlet is connected to the upper port of waterway 11, and the water inlet is connected to the lower port of waterway 11. This structure allows water to flow from top to bottom along the waterway, while the cooling oil flows from bottom to top under the action of the oil pump. The opposing arrangement allows the water to carry away the heat on the oil pipe more quickly, improving cooling efficiency. Of course, in other embodiments, the cooling oil pipe and waterway can also be arranged in the same direction.

[0038] An oil seal 7 is provided between the end of the rotating shaft 5 and the front cover plate 2. One end of the rotating shaft 5 is also provided with an end radial oil passage 51, which is located between the oil seal 7 and the bearing. The oil seal ensures that cooling oil will not easily leak out when the motor rotor rotates at high speed. The radial oil passage 51 allows cooling oil to flow through the bearing, providing lubrication. There are four end radial oil passages 51, arranged in a cross shape. The end radial oil passages 51, the middle radial oil passage 53, and the rotor oil passage 61 are evenly and symmetrically arranged, without affecting the dynamic balance of the rotor.

[0039] In the description of this specification, 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 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.

[0040] 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 high-efficiency oil-cooled motor, comprising a housing (1), a front cover plate (2), a rear cover plate (3), a stator (4), a rotating shaft (5), and a rotor core (6), wherein the stator (4) is disposed within the housing (1), the front cover plate (2) and the rear cover plate (3) are respectively fixed to both ends of the housing (1), and the rotor core (6) is disposed on the rotating shaft (5), and both ends of the rotating shaft (5) are respectively rotatably disposed on the front cover plate (2) and the rear cover plate (3) via bearings, characterized in that: The rotating shaft (5) is also provided with an axial oil passage (52) that runs through the rotating shaft (5), and the rotating shaft (5) is also provided with a plurality of central radial oil passages (53), and the plurality of central radial oil passages (53) are connected to the axial oil passages (52); the rotor core (6) is also provided with a plurality of rotor oil passages (61) that extend from the center of the rotor core (6) to both ends and the outside, and the rotor oil passages (61) are connected to the corresponding central radial oil passages (53); the front cover plate (2) is also provided with a cooling oil inlet B (21), and the cooling oil inlet B (21) is connected to the axial oil passages (52); the side wall of the housing (1) is provided with a water supply arranged in a spiral along the circumference. The housing (1) is provided with a water inlet and a water outlet for connecting the heat management water pump on the side wall of the housing (1). A cooling oil pipe is also provided inside the water channel (15). A cooling oil inlet A (11) is also provided on the side wall of the housing (1). An annular groove oil channel (41) is also provided on the outer wall of the stator (4). The cooling oil inlet A (11) passes through the housing (1) between two adjacent water channels (15) and is connected to the annular groove oil channel (41). One end of the cooling oil pipe is inserted into the rear cover plate (3) and is connected to the inside of the housing (1). The other end of the cooling oil pipe is connected to the cooling oil inlet A (11) and the cooling oil inlet B (21). There are four radial oil passages (53) in the middle section, which are arranged in a cross shape; The inner side of the front cover plate (2) and the rear cover plate (3) is provided with an arc-shaped annular groove (32), and the outer end of the rotor oil passage (61) faces the arc-shaped annular groove (32). The annular groove oil passages (41) are multiple and are arranged in parallel and spaced apart. The outer wall of the stator (4) is also provided with an axially connected oil passage (42) that connects the multiple annular groove oil passages (41). The rear cover plate (3) is also provided with a cooling oil outlet (31) near the outer edge of the rear cover plate (3). The cooling oil pipe includes a cooling oil pipe section A (101) and a cooling oil pipe section B (102). One end of the cooling oil pipe section A (101) is connected to the cooling oil outlet (31), and the other end is connected to the oil pump (100). The cooling oil pipe section B (102) is installed in the water channel (15), and both ends are respectively inserted from the water channel inlet and the water channel outlet, and one end is connected to the oil pump (100).

2. The high-efficiency oil-cooled motor according to claim 1, characterized in that: An oil seal (7) is provided between the end of the shaft (5) and the front cover plate (2), and an end radial oil passage (51) is provided at one end of the shaft (5), and the end radial oil passage (51) is located between the oil seal (7) and the bearing.

3. The high-efficiency oil-cooled motor according to claim 1, characterized in that: The cooling oil pipe also includes cooling oil pipe section C (103), cooling oil pipe section D (104) and tee pipe (105). Cooling oil pipe section B (102), cooling oil pipe section C (103) and cooling oil pipe section D (104) are connected by tee pipe (105), and cooling oil pipe section C (103) and cooling oil pipe section D (104) are respectively connected to cooling oil inlet A (11) and cooling oil inlet B (21).

4. The oil-cooled motor housing of an integrated heat exchanger according to claim 1, characterized in that: The waterway inlet and waterway outlet are located on the upper and lower parts of the outer wall of the shell, respectively, and the waterway inlet is connected to the upper port of the waterway (11) and the waterway inlet is connected to the lower port of the waterway (11).

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