Oil-cooled motor

Abstract

The utility model discloses an oil cooling motor, which comprises a cooling assembly arranged on the radial outer side surface of a rotating shaft, the cooling assembly comprises a cooling disc, the cooling disc forms a through oil slinging path along the radial direction, an opening at one end of the oil slinging path is communicated with an oil passing hole, and an opening at the other end of the oil slinging path is opposite to the radial inner side surface of an end winding. The cooling assemblies are arranged at the two axial ends of the iron core, so that cooling oil can flow into the annular groove through the oil passing holes which are uniformly distributed in the circumferential direction, and then is splashed to the inner side face of the end winding through the oil throwing oil ways which are uniformly distributed in the axial direction, the interior of the end winding is cooled, the overall cooling effect of the end winding is improved, and the service life of the end winding is prolonged. And cooling oil flowing through the oil guide groove cools the surface of the iron core and the winding in the groove, so that the overall cooling effect of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor cooling, and particularly relates to an oil-cooled motor. Background Art

[0002] With the continuous improvement of the power performance and economy of new energy vehicles, drive motors are developing towards high power, light weight, and high torque. Therefore, motor windings are evolving from round wires to flat wires. Compared with round wire windings, flat wire windings have a higher slot fill factor, thereby increasing the power density. However, the problem caused by the increased current is that the temperature of the windings in the slot and the end windings rises. How to better cool the motor has become a difficult point.

[0003] Existing cooling solutions mostly use cooling oil to cool the windings in the slots and the end windings of the iron core inside the motor. Among them, the iron core oil cooling circuit mostly adopts: an annular oil groove is formed inside the motor stator, and oil guiding grooves are formed on the surface of the iron core along the axial direction. The cooling oil flows through the oil guiding grooves of the iron core to both ends of the iron core and then cools the end windings through the oil spraying ports of the oil spraying rings. In this way, the cooling oil can only flow through the surface of the end windings and then cool its interior through the heat transfer of the end windings. The cooling effect of this cooling method for the end windings is not obvious, resulting in an obvious temperature rise during the operation of the motor. To ensure the working temperature of the workpieces inside the motor, the continuous working time of the motor is thus reduced. Summary of the Utility Model

[0004] In order to solve the problem of poor cooling effect of the end windings of the motor, the utility model provides an oil-cooled motor, and the specific technical solutions are as follows:

[0005] An oil-cooled motor, which includes a rotating shaft, an iron core, a stator, a machine shell, and a cooling component. An oil passing hole communicating with the outside and the inside of the machine shell is formed on the radial side surface of the rotating shaft. End windings are respectively arranged on the axial two end surfaces of the stator. The utility model further includes: a cooling component arranged on the radial outer side surface of the rotating shaft, and the cooling component includes a cooling disc. The cooling disc is formed with a through oil throwing oil path along the radial direction. One end opening of the oil throwing oil path is communicated with the oil passing hole, and the other end opening of the oil throwing oil path faces the radial inner side surface of the end winding.

[0006] Furthermore, an annular groove is formed on the radial inner side surface of the cooling disc connected to the radial outer side surface of the rotating shaft. The annular grooves are respectively arranged on the axial two end surfaces of the iron core. The annular groove is communicated with one end opening of the oil throwing oil path, and the radial projection of the annular groove along the rotating shaft can cover the oil passing hole.

[0007] Preferably, the oil throwing oil paths are evenly distributed with the axis of the cooling disc as the center line, and the annular grooves are continuous grooves.

[0008] Preferably, it further includes a hollow oil cavity with an open end formed in the central region of the rotating shaft. The open end of the hollow oil cavity is the port for injecting cooling oil. The oil through-holes are uniformly distributed on the axial side wall of the rotating shaft along the axis of the rotating shaft and penetrate through, and all the oil through-holes can communicate the hollow oil cavity and the oil slinging oil path.

[0009] Preferably, it further includes: an oil guiding groove formed axially on the radially outer side surface of the iron core; a winding in the slot arranged axially along the stator, the winding in the slot is electrically connected to the end winding, and the winding in the slot is located inside the stator.

[0010] It can be seen from the above technical solutions that the present utility model has the following beneficial effects:

[0011] By arranging cooling components at both axial ends of the iron core, the present utility model enables the cooling oil to flow into the annular groove through the oil through-holes uniformly distributed in the circumferential direction, and then be splashed onto the inner side surface of the end winding through the oil slinging oil path uniformly distributed in the axial direction, so as to cool the inside of the end winding and improve the overall cooling effect of the end winding. Secondly, the cooling oil flowing through the oil guiding groove cools the surface of the iron core and the winding in the slot, improving the overall cooling effect of the motor. Description of the Drawings

[0012] Figure 1 is a schematic diagram of a partial structure of an embodiment of the present utility model;

[0013] Figure 2 is a cross-sectional view of an embodiment of the present utility model;

[0014] Figure 3 is a cross-sectional view of the cooling component of the present utility model.

[0015] In the figure: 1, rotating shaft; 2, iron core; 3, stator; 4, cooling component; 5, hollow oil cavity; 6, oil through-hole; 7, end winding; 8, winding in the slot; 9, housing; 21, oil guiding groove; 41, cooling disc; 42, annular groove; 43, oil slinging oil path. Detailed Embodiments

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0017] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", "upper", etc. is 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 during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0018] As Figure 1 and Figure 2 shown, this embodiment includes a rotating shaft 1, an iron core 2, a stator 3, a housing 9, and a cooling assembly 4. An oil through-hole 6 communicating the outside with the interior of the housing 9 is formed on the radial side surface of the rotating shaft 1. End windings 7 are respectively provided on the axial end faces of the iron core 2.

[0019] Specifically, the oil through-hole 6 can guide the cooling oil from the outside to the interior of the housing 9 for cooling the components inside it. The in-slot winding 8 and the end winding 7 in the stator 3 cause an increase in the working current of the motor, thereby causing a large amount of heat generation in the in-slot winding 8 and the end winding 7.

[0020] Furthermore, this embodiment further includes a cooling assembly 4 provided on the radial outer side surface of the rotating shaft 1. The cooling assembly 4 includes a cooling disc 41. The cooling disc 41 is formed with a through-going oil-slinging oil path 43 in the radial direction. One end opening of the oil-slinging oil path 43 is communicated with the oil through-hole 6, and the other end opening of the oil-slinging oil path 43 faces the radial inner side surface of the end winding 7.

[0021] Specifically, a hole is formed in the center of the cooling assembly 4. The surface of the hole is in interference fit with the radial outer side surface of the rotating shaft 1, so that the cooling disc 41 is fixedly connected to the rotating shaft 1, and their axes coincide. When the rotating shaft 1 drives the cooling disc 41 to rotate, the radial distance between each point on the cooling disc 41 and the axis of the rotating shaft 1 remains unchanged. When the cooling disc 41 rotates, the cooling oil flows through the oil through-hole 6 and the oil-slinging oil path 43 and splashes towards the radial inner side surface of the end winding 7, thereby cooling the internal temperature of the end winding 7. Moreover, the distance between the splashing cooling oil and the radial inner side surface of the end winding 7 is the same, so that the cooling effect of the cooling oil on the end winding 7 is uniform, thereby improving the cooling quality and efficiency of the embodiment.

[0022] As Figure 3 shown, an annular groove 42 is formed on the radial inner side surface of the cooling disc 41 connected to the radial outer side surface of the rotating shaft 1. The annular groove 42 is respectively provided on the axial end faces of the iron core 2. The annular groove 42 is communicated with one end opening of the oil-slinging oil path 43. The radial projection of the annular groove 42 along the rotating shaft 1 can cover the oil through-hole 6.

[0023] Specifically, the radially inner side surface of the cooling disc 41 is in close contact with the radially outer side surface of the rotating shaft 1, so that the formed annular groove 42 is a sealing groove, and the oil through-hole 6 is located in the annular groove 42. The cooling oil enters the annular groove 42 through the oil through-hole 6. Then, while the cooling oil is stored in the annular groove 42, the cooling oil is also splashed into the interior of the end winding 7 through the oil-splashing oil path 43. The annular groove 42 enables the cooling oil to continuously splash into the interior of the end winding 7. Further, during the operation of the rotating shaft 1, the cooling oil can continuously cool the end winding 7, improving the cooling effect of the end winding 7 in this embodiment.

[0024] Further, the oil-splashing oil paths 43 are uniformly distributed with the axis of the cooling disc 41 as the center line, and the annular groove 42 is a continuous groove.

[0025] Specifically, during the rotation of the rotating shaft 1, the cooling oil is stored in the annular groove 42 through the oil through-hole 6. Under the action of centrifugal force, the cooling oil adheres to the bottom of the annular groove 42, i.e., the opening end of the oil-splashing oil path 43, so that the cooling oil flowing in the annular groove 42 can form a uniformly thick ring during the rotation of the rotating shaft 1, enabling the cooling oil to continuously pass through the uniformly distributed oil-splashing oil paths 43 and contact each part of the end winding 7, and making the distance from the annular groove 42 to the end winding 7 the same. Further, the cooling effects of each part of the end winding 7 are the same, thereby improving the cooling effect inside the end winding 7.

[0026] Further, the embodiment further includes a hollow oil cavity 5 formed in the central region of the rotating shaft 1 with one side open. The opening end of the hollow oil cavity 5 is the port for injecting the cooling oil. The oil through-holes 6 are uniformly distributed on the axial side wall of the rotating shaft 1 with the axis of the rotating shaft 1 and penetrate through, and all the oil through-holes 6 can communicate the hollow oil cavity 5 and the oil-splashing oil paths 43.

[0027] Specifically, the external cooling oil first enters the hollow oil cavity 5 and then enters the cooling assembly 4 through the oil through-hole 6. The hollow oil cavity 5 has the same axis as the rotating shaft 1, so that the distances from the oil through-holes 6 to the axis are the same. Further, during the rotation of the rotating shaft 1, the flow rates of the cooling oil in each oil through-hole 6 are the same, and the more the number of the oil through-holes 6, the faster the storage speed of the cooling oil in the annular groove 42. Secondly, the uniformly distributed oil through-holes 6 enable the cooling oil to enter the annular groove 42 uniformly through the oil through-holes 6 during the rotation of the rotating shaft 1, so that the change rates of the cooling oil in each part of the annular groove 42 are the same, improving the uniformity of the cooling of each part of the end winding.

[0028] Further, the embodiment further includes an oil guiding groove 21 formed along the axial direction on the radially outer side surface of the iron core 2; a slot winding 8 arranged along the axial direction of the stator 3. The slot winding 8 is electrically connected to the end winding 7, and the slot winding 8 is located inside the stator 3.

[0029] Specifically, after the cooling oil enters the end winding 7 through the oil slinging oil path 43 for cooling, it flows between the radial outer side of the iron core 2 and the radial inner side of the stator 3 under the action of gravity and the centrifugal force provided by the oil slinging oil path 43, and then can cool the iron core 2 and the winding 8 in the slot through the oil guiding groove 21, improving the cooling effect of the cooling component 4 on the motor.

[0030] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0031] The technologies, shapes, and structures not detailedly described in the present invention are all well-known technologies.

Claims

1. An oil-cooled motor, the oil-cooled motor comprising a rotating shaft (1), an iron core (2), a stator (3), a housing (9) and a cooling assembly (4), an oil through-hole (6) communicating the outside with the inside of the housing (9) being formed on the radial side surface of the rotating shaft (1), end windings (7) being respectively provided on the axial end surfaces of the stator (3), characterized in that: A cooling assembly (4) is provided on the radial outer side surface of the rotating shaft (1), the cooling assembly (4) comprising a cooling disc (41), the cooling disc (41) being formed with a through centrifugal oil passage (43) in the radial direction, one opening end of the centrifugal oil passage (43) communicating with the oil through-hole (6), and the other opening end of the centrifugal oil passage (43) being opposite to the radial inner side surface of the end winding (7).

2. The oil-cooled motor according to claim 1, wherein: An annular groove (42) is formed on the radial inner side surface of the cooling disc (41) connected to the radial outer side surface of the rotating shaft (1), the annular groove (42) being respectively provided on the axial end surfaces of the iron core (2), the annular groove (42) communicating with one opening end of the centrifugal oil passage (43), and the radial projection of the annular groove (42) along the rotating shaft (1) being capable of covering the oil through-hole (6).

3. The oil-cooled motor according to claim 2, wherein: The centrifugal oil passages (43) are uniformly distributed with the axis of the cooling disc (41) as the center line, and the annular groove (42) is a continuous groove.

4. The oil-cooled motor according to claim 1, wherein: It further comprises a hollow oil cavity (5) formed with one opening end in the central region of the rotating shaft (1), the opening end of the hollow oil cavity (5) being the port for injecting cooling oil, the oil through-holes (6) being uniformly distributed and penetrating on the axial side wall of the rotating shaft (1) with the axis of the rotating shaft (1) as the center line, and the oil through-holes (6) being capable of communicating the hollow oil cavity (5) and the centrifugal oil passages (43).

5. The oil-cooled motor according to claim 1, wherein It further comprises: An oil guiding groove (21) axially formed on the radial outer side surface of the iron core (2); A slot winding (8) axially arranged along the stator (3), the slot winding (8) being electrically connected to the end winding (7), and the slot winding (8) being located inside the stator (3).

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