Cooling system for oil-cooled motor and oil-cooled motor

Abstract

The utility model relates to a cooling system for an oil-cooled motor and the oil-cooled motor, the oil-cooled motor comprises a rotor shaft and a stator winding, and the cooling system comprises a spraying assembly which is arranged at the circumferential outer side of the stator winding and is used for spraying cooling oil to the stator winding from the circumferential outer side of the stator winding; the oil slinging assembly comprises at least one oil slinging disc fixedly arranged on the rotor shaft, the oil slinging disc is located on the circumferential inner side of the stator winding and is opposite to the stator winding in the radial direction, the oil slinging disc is provided with an oil slinging face in the circumferential direction, and the oil slinging face is provided with a first point and a second point; the distance between the first point and the rotor shaft is smaller than the distance between the second point and the rotor shaft. According to the scheme, through combination of an outer side oil injection mode and an inner side oil throwing mode, multiple cooling effects of the stator iron core and the stator winding can be realized, heat dissipation of the stator iron core and the stator winding is more uniform, excellent performance and reliability of the motor are guaranteed, assembly and manufacturing are simpler, and production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of motor cooling, and in particular to a cooling system for an oil-cooled motor and an oil-cooled motor. Background Art

[0002] At present, the motors used in new energy vehicles are gradually developing towards a wide speed range, high density and light weight, high efficiency, high reliability and safety, and high speed and high power density will inevitably put forward higher requirements on the heat dissipation capacity of the motor. The high heat of the motor will have a great impact on the performance and reliability of the motor, and the oil-cooled motor is a technology that uses fluid cooling to reduce the internal heat of the motor. Compared with traditional water-cooled motors, oil-cooled motors have higher cooling efficiency and better thermal stability, which can significantly improve the power density and reliability of the motor.

[0003] There are many cooling structures for existing oil-cooled motors, and each has its own advantages and disadvantages in terms of cooling effect and assembly difficulty. Some oil-cooled motors use a single spray pipe for cooling. Due to space limitations, the spray pipe has a limited spray range, which may result in poor spraying and high temperatures in some parts, affecting motor performance; some oil-cooled motors use oil guide rings for oil spraying, which is difficult to assemble, affecting production cycles and resulting in high production costs; some oil-cooled motors use stator core surface design oil circuits or centripetal cooling, which has a complex stator punching structure and poor overall rigidity, making it difficult to manufacture and affecting the reliability of the motor. Utility Model Content

[0004] Based on this, the utility model provides a cooling system for an oil-cooled motor and an oil-cooled motor, so as to solve the problems of the existing motor cooling system having a complex structure, poor cooling uniformity, and great difficulty in assembly and manufacturing.

[0005] In one aspect, the utility model provides a cooling system for an oil-cooled motor, wherein the oil-cooled motor comprises a rotor shaft and a stator winding, and the cooling system comprises:

[0006] A spray assembly, the spray assembly is arranged on the circumferential outer side of the stator winding, and is used to spray cooling oil onto the stator winding from the circumferential outer side of the stator winding;

[0007] An oil-slinging assembly, the oil-slinging assembly includes at least one oil-slinging plate fixedly arranged on the rotor shaft, the oil-slinging plate is located on the circumferential inner side of the stator winding and radially opposite to the stator winding, the oil-slinging plate is provided with an oil-slinging surface along the circumferential direction, the oil-slinging surface has a first point and a second point, and the distance between the first point and the rotor shaft is smaller than the distance between the second point and the rotor shaft.

[0008] In one of the embodiments, the oil-slinging plate is provided with a plurality of oil-slinging protrusions along the circumferential direction, and the side surfaces of the oil-slinging protrusions are the oil-slinging surfaces.

[0009] In one of the embodiments, the plurality of oil-slinging protrusions are evenly distributed at equal intervals along the circumferential direction of the oil-slinging plate.

[0010] In one of the embodiments, a limiting sleeve is fixed on the oil-slinging plate, and the limiting sleeve is used to abut against the rotor core of the oil-cooled motor.

[0011] In one of the embodiments, two oil-slinging pans are provided and are radially opposite to two ends of the stator winding respectively.

[0012] In one of the embodiments, the spray assembly includes a first spray pipe, which is disposed above the stator winding and extends in an axial direction, and a plurality of spray holes are disposed on a side of the first spray pipe facing the stator winding.

[0013] In one of the embodiments, the spray assembly further includes a second spray pipe, which is disposed above the stator winding and extends in a circumferential direction. A plurality of spray holes are disposed on a side of the second spray pipe facing the stator winding, and the second spray pipe is connected to the first spray pipe.

[0014] In one embodiment, a first oil passage extending in an axial direction and a plurality of second oil passages extending in a radial direction are provided in the rotor shaft, one end of the second oil passage is connected to the first oil passage, and the other end radially penetrates the rotor shaft.

[0015] In one of the embodiments, the oil inlet of the first oil channel is provided with a bowl-shaped plug.

[0016] On the other hand, the utility model also provides an oil-cooled motor, which includes the cooling system of any of the above embodiments.

[0017] Beneficial effects: The cooling system, by arranging a spray assembly on the circumferential outer side of the stator winding, allows the spray assembly to spray cooling oil from the outer side of the stator winding to the stator winding and the stator core, and by arranging an oil-slinging pan on the circumferential inner side of the stator winding, the oil-slinging pan can re-sling the cooling oil dripping from the stator winding to the inner side of the stator winding when the motor is running, and the oil-slinging surface can also provide radial guidance for the cooling oil and enhance the throwing effect of the cooling oil, so that the cooling oil can be thrown more evenly and more forcefully to the inner side of the stator winding, allowing the cooling oil to penetrate into the interior of the stator winding, increasing the contact area with the stator winding, and improving the cooling effect of the stator winding.

[0018] This solution combines the outer oil spraying and the inner oil throwing method to achieve multiple cooling effects of the stator core and the stator winding, making the heat dissipation of the stator core and the stator winding more uniform, ensuring the excellent performance and reliability of the motor. Moreover, compared with the existing technologies such as setting oil guide rings and designing oil circuits on the surface of the stator core, its assembly and manufacturing are simpler and the cost is lower, which can effectively improve the product assembly cycle and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of a cooling system for an oil-cooled motor in one embodiment;

[0020] Figure 2 FIG. 1 is a side view of a cooling system for an oil-cooled motor in one embodiment.

[0021] The figure marks in the drawings of the specification include: rotor shaft 1, first oil channel 101, second oil channel 102, stator winding 2, stator core 3, rotor core 4, spray assembly 5, first spray pipe 501, second spray pipe 502, spray hole 503, oil throwing plate 6, oil throwing surface 601, first point 6011, second point 6012, oil throwing protrusion 602, limit sleeve 7, bowl-shaped plug 8. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0024] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0025] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] On the one hand, an embodiment of the utility model provides a cooling system for an oil-cooled motor, the oil-cooled motor comprising a rotor shaft 1 and a stator winding 2, the cooling system comprising:

[0027] A spray assembly 5, the spray assembly 5 is arranged on the circumferential outer side of the stator winding 2, and is used to spray cooling oil from the circumferential outer side of the stator winding 2 to the stator winding 2;

[0028] The oil-slinging assembly includes at least one oil-slinging plate 6 fixedly arranged on the rotor shaft 1. The oil-slinging plate 6 is located on the circumferential inner side of the stator winding 2 and radially opposite to the stator winding 2. The oil-slinging plate 6 is provided with an oil-slinging surface 601 along the circumferential direction. The oil-slinging surface 601 has a first point 6011 and a second point 6012. The distance between the first point 6011 and the rotor shaft 1 is smaller than the distance between the second point 6012 and the rotor shaft 1.

[0029] The cooling system provided by the embodiment of the utility model is provided with a spray assembly 5 on the circumferential outer side of the stator winding 2, so that the spray assembly 5 can spray cooling oil from the outer side of the stator winding 2 to the stator winding 2 and the stator core 3, so that the stator core 3 and most of the outer windings of the stator winding 2 can be cooled by the sprayed cooling oil. The oil-slinging pan 6 is provided on the circumferential inner side of the stator winding 2, so that the cooling oil will drip onto the oil-slinging pan 6 under the action of gravity after passing through the stator winding 2, and because the oil-slinging pan 6 is fixed on the rotor shaft 1, the oil-slinging pan 6 will rotate with the rotor shaft 1. During the rotation of the oil-slinging pan 6, centrifugal force will be applied to the cooling oil dripping on the oil-slinging pan 6, and the cooling oil will be thrown to the inner side of the stator winding 2 in all directions, thereby cooling most of the inner ring windings from the inner side of the stator winding 2. In addition, an oil-flinging surface 601 is provided on the oil-flinging plate 6 of the cooling system, and the distance between the first point 6011 of the oil-flinging surface 601 and the rotor shaft 1 is smaller than the distance between the second point 6012 and the rotor shaft 1, that is, the oil-flinging surface 601 has a certain change in the radial direction, so that when the cooling oil is thrown outward from the oil-flinging surface 601, the oil-flinging surface 601 can provide radial guidance for the cooling oil and enhance the throwing effect of the cooling oil, so that the cooling oil can be thrown more evenly and more forcefully to the inner side of the stator winding 2, thereby improving the cooling effect of the stator winding 2.

[0030] The cooling system of the utility model can achieve multiple cooling effects of the stator core 3 and the stator winding 2 by combining the outer oil spraying and the inner oil throwing mode, so that the heat dissipation of the stator core 3 and the stator winding 2 is more uniform, thereby ensuring the excellent performance and reliability of the motor. Moreover, compared with the existing technologies such as setting an oil guide ring and designing an oil circuit on the surface of the stator core 3, its assembly and manufacturing are simpler and the cost is lower, which can effectively improve the product assembly cycle and reduce the production cost.

[0031] It should be understood that the cooling system provided in this embodiment needs to be combined with the component arrangement of the oil-cooled motor, so this embodiment first combines Figure 1 The following describes some of the structures of the oil-cooled motor.

[0032] See also Figure 1 The oil-cooled motor includes a stator and a rotor. The stator is sleeved outside the rotor. The stator includes a stator core 3 and a stator winding 2. The rotor includes a rotor shaft 1 and a rotor core 4. It should be noted that the motor also includes conventional parts such as a housing and bearings. Since other conventional parts of the motor and the positional relationship between the various parts of the motor are well known to those skilled in the art, they will not be described here.

[0033] The cooling system for an oil-cooled motor provided by an embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings.

[0034] See also Figure 1 The cooling system provided in this embodiment includes a spray assembly 5 and an oil-slinging assembly, wherein the spray assembly 5 is used to cool the stator and the rotor by spraying cooling oil, and the oil-slinging assembly cools the stator by throwing oil. By combining the outer oil spraying and the inner oil-slinging, multiple cooling effects of the stator core 3 and the stator winding 2 can be achieved, so that the heat dissipation of the stator core 3 and the stator winding 2 is more uniform, ensuring the excellent performance and reliability of the motor.

[0035] For details, see Figure 1 The spray assembly 5 is arranged on the circumferential outer side of the motor stator, and includes a first spray pipe 501. The first spray pipe 501 is arranged directly above the motor stator and extends along the axial direction of the stator, so that the first spray pipe 501 can at least cover the motor stator in the length direction, and a plurality of spray holes 503 are arranged on the side of the first spray pipe 501 facing the stator, i.e., the lower side. With such arrangement, the first spray pipe 501 can spray the cooling oil pumped by the oil storage container from each spray hole 503 in a split flow, so that the cooling oil is evenly sprayed on the outer side of the stator core 3 and the stator winding 2 along the axial direction of the stator, so as to cool the stator core 3 and the stator winding 2.

[0036] In some embodiments, the number of first spray pipes 501 can be set to multiple, and multiple first spray pipes 501 can be evenly spaced and distributed above the stator along the circumferential direction of the stator. In this way, multiple first spray pipes 501 can be used to spray oil at multiple positions of the stator synchronously, which can improve the uniformity of cooling oil spraying, thereby improving the uniformity of heat dissipation of the stator and achieving a better cooling effect.

[0037] For further information, see Figure 1 and Figure 2 In this embodiment, the spray assembly 5 further includes a second spray pipe 502, which is arranged above the motor stator and extends in the circumferential direction of the stator, so that the second spray pipe 502 can at least cover the upper part of the stator in the circumferential direction, and a plurality of spray holes 503 are arranged on the side of the second spray pipe 502 facing the stator, i.e., the lower side, and the second spray pipe 502 is connected to the first spray pipe 501. In this way, the cooling oil can be sprayed out through the spray holes 503 of the second spray pipe 502, so that the cooling oil is uniformly sprayed on the outer side of the stator core 3 and the stator winding 2 in the circumferential direction of the stator, so as to cool the stator core 3 and the stator winding 2.

[0038] In some embodiments, the number of the second spray pipes 502 can also be set to multiple, and the multiple second spray pipes 502 can be evenly spaced above the stator along the axial direction of the stator. In this way, the multiple second spray pipes 502 can simultaneously spray oil at multiple positions of the stator, which can improve the uniformity of cooling oil spraying, thereby improving the uniformity of heat dissipation of the stator, and achieving a better cooling effect.

[0039] The above-mentioned spray assembly 5 of this embodiment is composed of a first spray pipe 501 and a second spray pipe 502, which can realize cooling of the stator in multiple directions with good cooling effect. Moreover, compared with the existing oil guide ring and the design of adding an oil circuit on the surface of the stator core 3, its structure is simpler and can be directly fixed on the housing of the motor, which is more convenient to assemble, and can effectively improve the product assembly cycle and reduce production costs.

[0040] See also Figure 1 In this embodiment, the oil-slinging assembly is arranged on the circumferential inner side of the stator winding 2, and specifically includes an oil-slinging plate 6, which is fixedly mounted on the rotor shaft 1. For example, the oil-slinging plate 6 is press-fitted on the rotor shaft 1 by means of interference fit, and when the oil-slinging plate 6 is mounted on the rotor shaft 1, the oil-slinging plate 6 is located on the circumferential inner side of the stator winding 2 and radially opposite to the stator winding 2, for example, Figure 1The embodiment in which the oil-slinging pan 6 is opposite to the end of the stator winding 2 is exemplarily shown. With such an arrangement, the cooling oil dripping downward from the stator winding 2 can fall on the oil-slinging pan 6, and is thrown back to the inner side of the stator winding 2 when the oil-slinging pan 6 rotates with the rotor shaft 1, so that the cooling oil cools most of the inner ring winding from the inner side of the stator winding 2. Combined with the method of spraying oil from the outside, multiple cooling effects of the stator core 3 and the stator winding 2 can be achieved.

[0041] See also Figure 2 In this embodiment, an oil-slinging surface 601 is further provided on the oil-slinging plate 6 along the circumferential direction. The oil-slinging surface 601 has a first point 6011 and a second point 6012, and the distance between the first point 6011 and the rotor shaft 1 is smaller than the distance between the second point 6012 and the rotor shaft 1. That is to say, the oil-slinging surface 601 has a certain inclination angle in the circumferential direction instead of being a circumferential surface concentric with the rotor shaft 1. The inclination angle enables the oil-slinging surface 601 to provide radial guidance for the cooling oil and enhance the throwing effect of the cooling oil, so that the cooling oil can be thrown more evenly and more forcefully to the inner side of the stator winding 2, so that the cooling oil penetrates into the inside of the stator winding 2, increases the contact area with the stator winding 2, and improves the cooling effect of the stator winding 2.

[0042] For details, see Figure 2 In this embodiment, the oil-slinging plate 6 is a disc-shaped structure, and the oil-slinging plate 6 is provided with a plurality of oil-slinging protrusions 602 along the circumferential direction, and correspondingly, the side surface of each oil-slinging protrusion 602 is an oil-slinging surface 601, wherein the innermost end of the side surface of the oil-slinging protrusion 602 is a first point 6011 of the oil-slinging surface 601, and the outermost end of the side surface of the oil-slinging protrusion 602 is a second point 6012 of the oil-slinging surface 601. With such a configuration, not only can the oil be slinging through the oil-slinging protrusions 602, but also an oil receiving groove can be formed between each two adjacent oil-slinging protrusions 602, and the oil receiving groove can receive the cooling oil dripping from the stator winding 2, so that the cooling oil can be collected in the oil receiving groove, which can reduce the loss of the cooling oil, make the oil-slinging amount of the oil-slinging plate 6 more, and improve the cooling effect on the stator winding 2.

[0043] For further information, see Figure 2 In this embodiment, a plurality of oil-slinging protrusions 602 are evenly distributed at equal intervals along the circumferential direction of the oil-slinging plate 6. Such an arrangement can make the oil-slinging uniformity of the oil-slinging plate 6 better and improve the cooling uniformity of the stator winding 2.

[0044] In this embodiment, the structural form of the oil-slinging protrusion 602 is not limited. For example, the oil-slinging protrusion 602 can be configured as a ratchet shape, an arc-shaped protrusion, etc. Figure 2 The embodiment in which the oil-slinging protrusion 602 is a straight tooth structure is shown only as an example.

[0045] In addition, it should be noted that the oil-slinging protrusions 602 of the present embodiment can be formed by protruding outward along the outer circumference of the oil-slinging pan 6, or can be formed by providing grooves on the outer circumference of the oil-slinging pan 6.

[0046] Furthermore, in some embodiments, the number of the oil-slinging plates 6 can be set to two, and the two oil-slinging plates 6 are radially opposite to the two ends of the stator winding 2. In this way, oil can be slinged from the positions opposite to the two ends of the stator winding 2, thereby enhancing the oil-slinging effect of the oil-slinging assembly and improving the cooling uniformity of the stator winding 2.

[0047] Further, in this embodiment, the oil-slinging plate 6 is fixedly connected to the limiting sleeve 7. Figure 1 The limiting sleeve 7 is a circular sleeve integrally formed with the oil-slinging plate 6. The limiting sleeve 7 is located on the side of the oil-slinging plate 6 facing the rotor core 4. The limiting sleeve 7 is also pressed on the rotor shaft 1 in an interference fit manner. When the oil-slinging plate 6 is installed on the rotor shaft 1, the limiting sleeve 7 presses against the rotor core 4 from the inner side of the oil-slinging plate 6. With such a configuration, the oil-slinging plate 6 can rotate with the motor rotor shaft 1 to achieve the function of cooling the stator winding 2 by swinging the cooling oil, and can also achieve the function of pressing the rotor core 4 and limiting the rotor core 4, which has multiple effects.

[0048] See also Figure 1 In some embodiments, a first oil passage 101 and a plurality of second oil passages 102 are further provided in the rotor shaft 1. The first oil passage 101 is an oil inlet passage, which is extended along the axial direction of the rotor shaft 1, and an oil inlet connected to the first oil passage 101 is provided at one end of the rotor shaft 1. The second oil passage 102 is an oil outlet passage, and each second oil passage 102 is extended along the radial direction of the rotor shaft 1, and the inner end of the second oil passage 102 is connected to the first oil passage 101, and the outer end of the second oil passage 102 passes through the rotor shaft 1 and is connected to the cooling oil passage inside the rotor core 4. In this arrangement, cooling oil is injected into the first oil passage 101 through the oil inlet, and the cooling oil is diverted from the first oil passage 101 to each second oil passage 102, and flows to each position of the rotor core 4 along each second oil passage 102, so as to realize cooling of the rotor core 4.

[0049] For further information, see Figure 1 A bowl-shaped plug 8 is provided at the oil inlet of the first oil channel 101. The bowl-shaped plug 8 can pressurize the cooling oil in the first oil channel 101, provide assistance for the cooling oil to flow toward the second oil channel 102 and the rotor core 4, enhance the fluidity of the cooling oil, and improve the cooling effect on the rotor core 4.

[0050] On the other hand, an embodiment of the utility model further provides an oil-cooled motor, which includes the cooling system of any of the above embodiments.

[0051] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A cooling system for an oil-cooled motor, the oil-cooled motor comprising a rotor shaft (1) and a stator winding (2), characterized in that: The cooling system comprises: A spray assembly (5), the spray assembly (5) being arranged on the circumferential outer side of the stator winding (2) and being used for spraying cooling oil onto the stator winding (2) from the circumferential outer side of the stator winding (2); An oil-slinging assembly, the oil-slinging assembly comprising at least one oil-slinging plate (6) fixedly arranged on the rotor shaft (1), the oil-slinging plate (6) being located on the circumferential inner side of the stator winding (2) and radially opposite to the stator winding (2), the oil-slinging plate (6) being provided with an oil-slinging surface (601) along the circumferential direction, the oil-slinging surface (601) having a first point (6011) and a second point (6012), the distance between the first point (6011) and the rotor shaft (1) being smaller than the distance between the second point (6012) and the rotor shaft (1).

2. The cooling system according to claim 1, characterized in that: The oil-slinging plate (6) is provided with a plurality of oil-slinging protrusions (602) along the circumferential direction, and the side surfaces of the oil-slinging protrusions (602) are the oil-slinging surfaces (601).

3. The cooling system according to claim 2, characterized in that: The plurality of oil-slinging protrusions (602) are evenly distributed at equal intervals along the circumferential direction of the oil-slinging plate (6).

4. The cooling system according to claim 1, characterized in that: A limiting sleeve (7) is fixed on the oil-swinging plate (6), and the limiting sleeve (7) is used to abut against the rotor core (4) of the oil-cooling motor.

5. The cooling system according to claim 1, characterized in that: Two oil-slinging plates (6) are provided and are radially opposite to the two ends of the stator winding (2) respectively.

6. The cooling system according to claim 1, characterized in that: The spray assembly (5) comprises a first spray pipe (501), the first spray pipe (501) being arranged above the stator winding (2) and extending in an axial direction, and a plurality of spray holes (503) being arranged on a side of the first spray pipe (501) facing the stator winding (2).

7. The cooling system according to claim 6, characterized in that: The spray assembly (5) further comprises a second spray pipe (502), which is arranged above the stator winding (2) and extends in a circumferential direction; a plurality of spray holes (503) are arranged on a side of the second spray pipe (502) facing the stator winding (2); and the second spray pipe (502) is connected to the first spray pipe (501).

8. The cooling system according to claim 1, characterized in that: A first oil passage (101) extending in an axial direction and a plurality of second oil passages (102) extending in a radial direction are arranged in the rotor shaft (1); one end of the second oil passage (102) is connected to the first oil passage (101), and the other end radially penetrates the rotor shaft (1).

9. The cooling system according to claim 8, characterized in that: The oil inlet of the first oil passage (101) is provided with a bowl-shaped plug (8).

10. An oil-cooled motor, characterized in that: A cooling system comprising any one of claims 1 to 9.

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