Stator, motor and vehicle

Abstract

The utility model relates to a stator, a motor and a vehicle, belongs to the technical field of vehicles, and aims to solve the technical problem of poor cooling effect of the stator in the prior art. The stator provided by the utility model comprises an annular shell, and the annular shell is provided with a liquid inlet. The stator further comprises a plurality of stator iron cores and an annular cover, the stator iron cores are stacked in the annular shell in the axial direction of the annular shell, a plurality of liquid outlets are formed in the end face of each stator iron core, a cooling pipeline is arranged between the end face of each stator iron core and the inner circumferential face of the annular shell, and the cooling pipelines are communicated with the liquid inlets and the liquid outlets; the annular cover is arranged on at least one end face of the stator core along the circumferential direction of the annular shell, the annular cover is provided with an annular channel and a spray hole which are communicated with each other, and the annular channel is communicated with the liquid outlet. The perimeter of the annular cover is smaller than or equal to one half of the perimeter of the annular shell, and the annular cover is arranged on the side, away from the gravity direction, of the stator iron core.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field, concretely relates to a kind of stator, motor and vehicle. BACKGROUND

[0002] At present, new energy vehicle industry has welcomed explosive growth, in this vigorous development wave, motor is as the core component of driving new energy vehicle forward, and its performance advantage and disadvantage directly concern whole vehicle performance, importance is self-evident.As far as existing technical means is concerned, to realize the efficient heat dissipation of motor, ensure its stable operation, oil cooling technology is widely used in the cooling link of motor stator and winding.

[0003] The related technology discloses a stator cooling device, a stator and a motor. The stator cooling device comprises a first cooling pipeline, a second cooling pipeline and a plurality of third cooling pipelines. The first cooling pipeline and the second cooling pipeline are arranged around the end windings at the axial ends of the stator, respectively. The plurality of third cooling pipelines are arranged along the circumferential direction of the first cooling pipeline and the second cooling pipeline at intervals. The third cooling pipelines penetrate the stator slots of the stator. The two ends of the third cooling pipelines are connected to the first cooling pipeline and the second cooling pipeline, respectively. A plurality of first liquid injection openings are arranged on the third cooling pipelines, and the opening direction of the first liquid injection openings is towards the stator windings of the stator slots. The third cooling pipelines are arranged at the slot bottoms of the stator slots. The cooling liquid is sprayed on the stator windings through the first liquid injection openings, so that the stator windings can be further cooled directly, and the cooling effect of the cooling device is improved. However, due to the influence of gravity, the cooling liquid at the upper end of the stator may not effectively cover the windings, so that the cooling effect of the region is not as expected, which may affect the overall cooling uniformity. SUMMARY

[0004] The utility model discloses a kind of stator, motor and vehicle to overcome the technical problem that the stator cooling effect is poor in the related art.

[0005] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0006] According to the first aspect of the present application, the present application provides a kind of stator, the stator includes annular shell, multiple stator cores and annular cover, annular shell is equipped with liquid inlet, multiple stator cores are stacked along the axial direction of annular shell and are arranged in annular shell, the end surface of stator core is equipped with multiple liquid outlets, the end surface of stator core and the inner circumferential surface of annular shell are equipped with cooling pipeline, cooling pipeline is communicated in liquid inlet and liquid outlet, annular cover is arranged on the end surface of at least one side of stator core along the circumferential direction of annular shell, annular cover is equipped with annular channel and spray hole being communicated, annular channel is communicated with liquid outlet, the circumference of annular cover is less than or equal to the half circumference of annular shell, and annular cover is arranged on the side of stator core away from gravity direction.

[0007] According to the above technical means, the annular cover is arranged on the side of the stator away from the direction of gravity. The gravity will cause the cooling liquid to accumulate below the stator and the cooling effect above the stator is poor. Arranging the annular cover on the side away from the direction of gravity, i.e. the upper end of the stator, can guide the cooling liquid to preferentially spray and cool the upper end region which originally has poor cooling effect. The annular cover is provided with a ring-shaped channel and a spray hole in communication. The cooling liquid flows out of the liquid outlet and then enters the ring-shaped channel and is sprayed out through the spray hole, so that the cooling liquid can be more accurately sprayed into the space surrounded by the annular cover, especially the upper end winding, thereby solving the problem of poor cooling effect of the stator.

[0008] In a possible implementation, the space surrounded by the annular cover is a first space, and the spray hole is arranged on the side wall of the annular cover facing the first space.

[0009] According to the above technical means, the spray hole is arranged towards the side wall of the space, which can form a specific spraying track of the cooling liquid in the chamber, so that the cooling liquid is more evenly distributed in the first space and the contact area with the stator winding is increased, thereby strengthening the heat dissipation effect and further improving the cooling capacity of the stator winding.

[0010] In a possible implementation, the cooling pipeline comprises a first part and a second part. The first part is parallel to the axial direction of the annular cover, the second part has an axis intersecting the first part, and the second part extends away from the first part in the direction of gravity. The second part is in communication with the side of the liquid outlet away from the annular cover.

[0011] According to the above technical means, the first part of the cooling pipeline is parallel to the axial direction of the annular cover, which can ensure that the cooling liquid can be efficiently transported to each position of the stator core in the axial direction, thereby providing stable cooling liquid supply for the subsequent cooling process. The second part has an axis intersecting the first part and extending away from the first part in the direction of gravity, and is in communication with the side of the liquid outlet away from the annular cover. In this way, under the action of gravity, the cooling liquid can flow more smoothly from the second part to the liquid outlet, and then enter the first space surrounded by the annular cover to cool the stator winding, thereby improving the circulation efficiency of the cooling liquid and enhancing the overall cooling effect.

[0012] In a possible implementation, the first part is in communication with the liquid inlet.

[0013] According to the above technical means, the first part is directly communicated with the liquid inlet, so that the cooling liquid can quickly enter the main part of the cooling pipeline with the shortest path and the smallest resistance. Since the first part is parallel to the axis of the annular shell, the cooling liquid can be quickly and uniformly distributed to each stator core position along the axial direction after entering, thereby providing timely and sufficient cooling liquid supply for the subsequent cooling process, greatly improving the delivery efficiency of the cooling liquid, ensuring that the cooling system can quickly respond and stably operate, and meeting the cooling demand of the stator winding of the motor under different working conditions.

[0014] In a possible implementation, the stator core is provided with a plurality of spaced liquid outlets along the circumferential direction of the stator core.

[0015] According to the above technical means, a plurality of spaced liquid outlets are arranged along the circumferential direction of the stator core, so as to ensure that the cooling liquid is uniformly distributed around the stator core. After the cooling liquid flows out of the liquid outlets, the stator winding can be covered in all directions, so as to avoid the occurrence of a cooling blind area.

[0016] In a possible implementation, the stator further comprises a winding, the winding is arranged in the first space, and the winding is connected to the inner circumferential surface of the stator core.

[0017] According to the second aspect of the present application, an electric machine is provided, which comprises a rotor and the above-mentioned stator, the space surrounded by the stator core is a second space, and the rotor is arranged in the second space.

[0018] According to the above technical means, the winding is arranged in the first space, and the first space is the area where the cooling liquid is mainly sprayed through the spray holes in the annular cover. This layout enables the winding to directly and sufficiently receive the spray cooling of the cooling liquid, and the cooling liquid is in close contact with the winding, thereby greatly improving the cooling efficiency.

[0019] In a possible implementation, the rotor comprises a rotor core and a rotating shaft, which are stacked along the axial direction of the annular shell, the space surrounded by the rotor core is a third space, the circumferential surface of the rotor core is provided with a plurality of oil throwing holes, the rotating shaft is rotatably arranged in the third space, the rotating shaft is provided with a first oil channel, the rotor core is provided with a second oil channel communicated with the first oil channel and a third oil channel communicated with the second oil channel along the radial direction of the rotor core, wherein the first oil channel extends along the axial direction of the rotating shaft, the second oil channel extends along the radial direction of the rotor core, and the third oil channel communicates the second oil channel with part of the oil throwing holes.

[0020] According to the above technical means, the shaft is provided with a first oil path extending in the axial direction, which can stably deliver cooling oil to the rotor core area.

[0021] In a possible implementation, the rotor core is further provided with a fourth oil path arranged along the radial direction of the rotor core, the fourth oil path being connected between another part of the oil throwing holes and the second oil path; the fourth oil path comprises a first sub-path and a second sub-path connected in sequence, the first sub-path being connected with the oil throwing hole, and the second sub-path being connected with the second oil path, the opening of the oil throwing hole connected with the first sub-path facing the annular housing and being located between the second sub-path and the annular housing along the radial direction of the annular housing.

[0022] According to the above technical means, the fourth oil path and the third oil path are arranged along the radial direction and connected with different parts of the oil throwing holes, which greatly increases the spraying path and coverage range of the cooling oil.

[0023] According to the third aspect of the present application, a vehicle is provided, which comprises the motor described above.

[0024] According to the above technical means, the motor greatly reduces the wear degree of the rotor, winding and other components through the above arrangement.

[0025] The utility model discloses the beneficial effect has:

[0026] (1) the present application reduces the winding range of the stator annular cover, only retains the upper end part of winding, and accumulates oil by the upper end annular cover, and the upper end of winding is precisely cooled by the annular cover, and the cooling efficiency is greatly improved.

[0027] (2) The ring cover part is reduced, which directly reduces the manufacturing cost of the motor. Meanwhile, the application provides good cooling conditions for each component of the motor, including targeted cooling of the upper and lower ends of the winding, which greatly reduces the wear degree of the rotor, winding and other components.

[0028] It should be noted that the technical effects brought by the second aspect and the third aspect implementation manner can refer to the technical effects brought by the corresponding implementation manner in the first aspect, which will not be repeated here.

[0029] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application, but are not intended to limit the application.

[0031] Figure 1 is one of the motor structure schematic diagrams in the prior art;

[0032] Figure 2 is another motor structure schematic diagram in the prior art;

[0033] Figure 3 is a motor structure schematic diagram provided by an embodiment of the present application;

[0034] Figure 4 is a partial motor structure schematic diagram provided by an embodiment of the present application;

[0035] Figure 5 is Figure 3 a cross-sectional schematic diagram of the motor in the prior art;

[0036] Figure 6 is Figure 3 a structure schematic diagram of the rotor core in the prior art;

[0037] Figure 7 is Figure 3 a cross-sectional schematic diagram of the rotor core in the prior art;

[0038] Figure 8 is Figure 3 a cross-sectional schematic diagram of the rotating shaft in the prior art.

[0039] Reference signs:

[0040] 100, stator; 101, annular housing; 1011, liquid inlet; 102, stator core; 1021, liquid outlet; 103, annular cover; 104, cooling pipeline; 1041, first part; 1042, second part; 105, winding; 200, rotor; 201, rotor core; 2011, oil throwing hole; 202, rotating shaft; 2021, first oil path; 2022, second oil path; 2023, third oil path; 2024, fourth oil path; 2024a, first sub-path; 2024b, second sub-path; S1, first space; S2, second space; S3, third space. DETAILED DESCRIPTION

[0041] In order for those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings.

[0042] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application.

[0043] At present, the new energy automobile industry is in a stage of rapid development, and the performance of the motor as the main driving force source of the new energy automobile plays a crucial role.

[0044] However, in actual use, the motor needs to convert the energy of the battery into mechanical energy, and this conversion process will be affected by harsh and complex working conditions. For example, when the driver performs an automobile rapid acceleration operation, the current in the motor will rise sharply, and with this sharp rise in current, the copper loss heating of the winding 105 will also become more serious.

[0045] At the same time, the power and the rotating speed frequently change, which results in that the motor is facing the most severe working condition test at all times. In addition, due to the fact that the industry competition becomes more and more fierce year by year, the new energy motor presents a development trend of "miniaturization" and "high speed", so the power density and the torque density of the motor are further improved, but this makes the heat dissipation more difficult.

[0046] Based on this, the application provides a vehicle. The vehicle can be an electric vehicle or a hybrid electric vehicle. For example, the vehicle can be a passenger car, such as a sedan, a sport utility vehicle (SUV), a multi-purpose vehicle (MPV), or the like. The vehicle can also be a bus, a truck, a semi-trailer, or the like. The application does not specifically limit this.

[0047] In some embodiments, the vehicle in the application includes a motor that provides power to the vehicle.

[0048] Please refer to Figure 1 and Figure 2 , Figure 1 and Figure 2 are the structures of the motor in the related art. As can be seen, in the existing motor structure, when the oil flows through the flow channel of the stator 100 to the oil injection ring, the cooling of the winding 105 is achieved through the oil injection ring. However, due to gravity, the cooling liquid will flow to the lower end of the winding 105, so that the cooling effect at the upper end of the winding 105 is poor.

[0049] Based on this, in some embodiments, please refer to Figure 3 and in combination with Figure 4 , the application provides a stator 100, which includes an annular housing 101, a plurality of stator cores 102, and an annular cover 103. The annular housing 101 is provided with a liquid inlet 1011. The plurality of stator cores 102 are arranged in the annular housing 101 along the axial direction of the annular housing 101. The end surface of the stator core 102 is provided with a plurality of liquid outlets 1021. The end surface of the stator core 102 and the inner circumferential surface of the annular housing 101 are provided with a cooling pipeline 104. The cooling pipeline 104 is connected to the liquid inlet 1011 and the liquid outlet 1021. The annular cover 103 is arranged on the end surface of at least one side of the stator core 102 along the circumferential direction of the annular housing 101. The annular cover 103 is provided with an annular channel and a spray hole in communication. The annular channel is in communication with the liquid outlet 1021. The circumference of the annular cover 103 is less than or equal to half the circumference of the annular housing 101, and the annular cover 103 is arranged on the side of the stator core 102 away from the direction of gravity.

[0050] It can be understood that the annular cover 103 in the application can correspond to the oil injection ring in the prior art. Of course, the annular cover 103 in the application can also be an oil blocking ring. The application does not limit this.

[0051] It should be noted that the liquid inlet 1011 of the annular housing 101 can be arranged on the end surface or the circumferential surface. The application does not limit this. The application exemplarily illustrates that the liquid inlet 1011 is arranged on the circumferential surface of the annular housing 101.

[0052] On this basis, the cooling pipeline 104 is connected with the liquid inlet 1011 and the liquid outlet 1021, so that the cooling liquid can enter from the liquid inlet 1011, flow through the cooling pipeline 104, and then flow out from the liquid outlet 1021, thereby ensuring the circulation of the cooling liquid in the area of the stator core 102 and providing a basis for heat dissipation. The annular cover 103 is arranged on the side of the stator core 102 away from the direction of gravity, so as to guide the cooling liquid to preferentially spray and cool the upper end of the winding 105 of the stator 100, thereby effectively solving the problem of insufficient cooling liquid and poor cooling effect of the upper end of the stator 100 caused by gravity.

[0053] The annular channel of the annular cover 103 is connected with the liquid outlet 1021, and the spray hole faces the first space S1, so that the cooling liquid can be accurately sprayed to the area where the winding 105 of the stator 100 is located, thereby increasing the contact area between the cooling liquid and the winding 105, improving the heat exchange efficiency, achieving more uniform and efficient cooling of the winding 105, and ensuring that the winding 105 of the stator 100 can be kept at an appropriate temperature and maintain good electrical performance when the motor is running under high load.

[0054] Meanwhile, in the present application, the circumference of the annular cover 103 is limited to be less than or equal to one-half of the circumference of the annular shell 101, so as to ensure that the cooling liquid can effectively pass through the spray hole to fully spray and cool the winding 105 at the upper end of the stator core 102, thereby avoiding the situation that the cooling liquid is dispersed and the spraying effect is poor due to the large size of the annular cover.

[0055] Exemplarily, the annular shell 101 can be formed by the wall surface of the stator core 102.

[0056] In some embodiments, please refer to Figure 3 and combine with Figure 4 The space surrounded by the annular cover 103 is the first space S1, and the spray hole is arranged on the side wall of the annular cover 103 facing the first space S1.

[0057] On this basis, the cooling liquid enters the cooling pipeline 104 from the liquid inlet 1011, flows through the liquid outlet 1021 on the end surface of the stator core 102, and then enters the annular channel of the annular cover 103. Due to the arrangement of the spray hole on the side wall of the annular cover 103 facing the first space S1, the cooling liquid will be sprayed out from the spray hole under the action of pressure and directly enter the first space S1, i.e., the area where the winding 105 of the stator 100 is located, thereby achieving the cooling of the winding 105.

[0058] Meanwhile, the spray hole is arranged to face the first space S1, so that the cooling liquid will not be sprayed to other unnecessary places, thereby reducing the splashing and loss of the cooling liquid, ensuring that the cooling liquid is used for cooling the winding 105 of the stator 100, improving the utilization rate of the cooling liquid, and avoiding the waste of the cooling liquid.

[0059] In some embodiments, please refer to Figure 4 and combine with Figure 3The cooling pipeline 104 includes a first portion 1041 and a second portion 1042. The first portion 1041 is parallel to the axial direction of the annular housing 101. The second portion 1042 is intersected with the first portion 1041, and extends away from the first portion 1041 along the direction of gravity. The second portion 1042 is communicated with the liquid outlet 1021 away from the side of the annular cover 103.

[0060] On this basis, the first portion 1041 is parallel to the axial direction of the annular housing 101, which ensures that the cooling liquid can be quickly and uniformly transported to the positions of each stator core 102 along the axial direction, thereby providing stable cooling liquid supply for the subsequent cooling process. The second portion 1042 is intersected with the first portion 1041 and extends away from the first portion 1041 along the direction of gravity, and is communicated with the liquid outlet 1021 away from the side of the annular cover 103. The second portion 1042 ingeniously assists the flow of the cooling liquid by means of gravity. Under the action of gravity, the cooling liquid can flow more smoothly from the second portion 1042 to the liquid outlet 1021, and then enter the first space S1 surrounded by the annular cover 103 to cool the winding 105 of the stator 100. This greatly improves the circulation efficiency of the cooling liquid and enhances the overall cooling effect.

[0061] In addition, under the action of gravity, the flow of the cooling liquid in the second portion 1042 reduces the influence of the cooling effect caused by the fluctuation of the cooling liquid flow due to unstable pump pressure and other factors. At the same time, under different working conditions, such as changes in motor speed and load fluctuations, gravity can always ensure that the cooling liquid flows along the predetermined path, thereby enhancing the stability and reliability of the cooling system under various working conditions and ensuring that the winding 105 of the stator 100 can always be effectively cooled, thereby reducing the risk of motor failure caused by unstable cooling.

[0062] In some embodiments, the first portion 1041 is communicated with the liquid inlet 1011.

[0063] On this basis, the first portion 1041 is directly communicated with the liquid inlet 1011, thereby opening up an efficient and fast access channel for the cooling liquid. The cooling liquid can rapidly flow into the main part of the cooling pipeline 104 along the shortest path and with the smallest resistance. Since the first portion 1041 is parallel to the axial direction of the annular housing 101, the cooling liquid can flow along the axial direction immediately after entering.

[0064] In some embodiments, please continue to refer to Figure 3 Along the circumferential direction of the stator core 102, the stator core 102 is provided with a plurality of spaced-apart liquid outlets 1021.

[0065] On this basis, the plurality of spaced-apart liquid outlets 1021 can uniformly distribute the cooling liquid along the circumferential direction of the stator core 102. After the cooling liquid flows out of these liquid outlets 1021, it can cover the winding 105 of the stator 100, thereby further improving the cooling efficiency.

[0066] In some embodiments, please refer to Figure 3 and in combination with Figure 5 , the stator 100 in the present application also includes a winding 105, which is arranged in the first space S1 and connected to the inner circumferential surface of the stator core 102.

[0067] On this basis, on the one hand, the winding 105 is connected to the inner circumferential surface of the stator core 102 to provide stable mechanical support for the winding 105 and reduce vibration and displacement of the winding 105 during motor operation. On the other hand, the cooling liquid sprayed by the annular cover 103 can directly impact the winding 105 located in the first space S1.

[0068] In the related art, due to the action of gravity, the cooling liquid is easy to accumulate at the lower end of the winding 105, resulting in insufficient supply of cooling liquid at the upper end of the winding 105 and poor cooling effect. In the present application, the annular cover 103 is arranged on the side of the stator core 102 away from the direction of gravity, that is, the upper end of the winding 105. The cooling liquid sprayed by the annular cover 103 can directly and preferentially act on the upper end of the winding 105, accurately making up for the problem of insufficient cooling liquid at the upper end caused by gravity. The cooling liquid is sprayed out at high speed from the annular channel of the annular cover 103 through the spray hole, directly impacting the upper end of the winding 105, quickly taking away the heat generated in this area, and ensuring that the temperature at the upper end of the winding 105 will not be too high due to insufficient cooling, maintaining good electrical performance.

[0069] In some embodiments, please refer to Figure 3 and in combination with

[0070] In the present application, the motor also includes a rotor 200, and the space surrounded by the stator core 102 is a second space S2, and the rotor 200 is arranged in the second space S2.

[0071] In some embodiments, please refer to Figure 3 and in combination with Figure 6 , Figure 7 and Figure 8 , the rotor 200 includes a rotor core 201 and a rotating shaft 202, which are stacked along the axial direction of the annular housing 101, the space surrounded by the rotor core 201 is a third space, the circumferential surface of the rotor core 201 is provided with a plurality of oil throwing holes 2011, the rotating shaft 202 is rotatably arranged in the third space, and the rotating shaft 202 is provided with a first oil channel 2021; along the radial direction of the rotor core 201, the rotor core 201 is provided with a second oil channel 2022 in communication with the first oil channel 2021 and a third oil channel 2023 in communication with the second oil channel 2022.

[0072] The first oil passage 2021 extends along the axial direction of the rotating shaft 202, the second oil passage 2022 extends along the radial direction of the rotor core 201, and the third oil passage 2023 is connected to the second oil passage 2022 and part of the oil throwing holes 2011.

[0073] On this basis, the cooling liquid flows into the first oil passage 2021 from the inlet of the rotating shaft 202. Since the first oil passage 2021 extends along the axial direction of the rotating shaft 202, the cooling liquid can be stably transported along the axial direction of the rotating shaft 202 to the area of the rotor core 201. Subsequently, the cooling liquid flows along the radial direction of the rotor core 201 through the second oil passage 2022 connected to the first oil passage 2021. Finally, the cooling liquid reaches part of the oil throwing holes 2011 through the third oil passage 2023.

[0074] When the rotor 200 rotates at high speed, the cooling liquid in the oil throwing holes 2011 is thrown out under the action of centrifugal force. These thrown-out cooling liquids cool and lubricate the rotor core 201 and the surrounding components, such as the winding 105. At the same time, part of the cooling liquid can also lubricate the connection part of the rotating shaft 202 and the rotor core 201, reducing the friction between the components.

[0075] In addition, compared with the prior art motor shown in Figure 1 and Figure 2 , the present application also provides a cooling structure for the rotor 200 to cool the rotor 200. It can be understood that the present application simultaneously adds a corresponding flow channel for the cooling liquid on the stator 100 and the rotor 200, and simultaneously cools the stator 100 and the rotor 200. In the stator 100, the cooling liquid circulation path is constructed through the liquid inlet 1011 of the annular housing 101, the cooling pipeline 104, and the liquid outlet 1021, and the like, to efficiently cool the winding 105 of the stator 100. In the rotor 200, the rotating shaft 202 is provided with the first oil passage 2021, and the rotor core 201 is provided with the second oil passage 2022, the third oil passage 2023, and the oil throwing hole 2011 connected thereto, to realize the cooling and lubricating effect.

[0076] In some embodiments, please refer to Figure 7 and in combination with Figure 8 , the rotor core 201 is further provided with a fourth oil passage 2024, which is arranged along the radial direction of the rotor core 201 together with the third oil passage 2023, and is connected between another part of the oil throwing holes 2011 and the second oil passage 2022.

[0077] The fourth oil path 2024 includes a first sub-path 2024a and a second sub-path 2024b connected in sequence, the first sub-path 2024a is connected with the oil throwing hole 2011, and the second sub-path 2024b is connected with the second oil path 2022, the opening of the oil throwing hole 2011 connected with the first sub-path 2024a faces the annular housing 101, that is, the opening faces downward to the winding 105, and the oil throwing hole 2011 is located between the second sub-path 2024b and the annular housing 101 along the radial direction of the annular housing 101, and further, the oil throwing hole 2011 is located between the second sub-path 2024b and the winding 105.

[0078] On this basis, the cooling liquid flows into the first oil path 2021 from the shaft 202 inlet, is transported to the rotor core 201 area in the axial direction, and then flows radially through the second oil path 2022. At this time, the cooling liquid enters the fourth oil path 2024, and the second sub-path 2024b of the fourth oil path 2024 is connected with the second oil path 2022 to introduce part of the cooling liquid into the fourth oil path 2024. The cooling liquid flows to the oil throwing hole 2011 connected with the first sub-path 2024a in the fourth oil path 2024. Since the openings of these oil throwing holes 2011 face the winding 105 and are located between the second sub-path 2024b and the winding 105 along the radial direction of the annular housing 101, when the rotor 200 rotates at high speed, the cooling liquid is thrown out of the oil throwing hole 2011 under the action of centrifugal force, directly sprayed to the winding 105, and realizes precise cooling of the lower end of the winding 105, and cooperates with the annular cover 103 to realize omnidirectional cooling of the winding 105.

[0079] The fourth oil path 2024 and the third oil path 2023 are arranged along the radial direction of the rotor core 201, and respectively communicate different parts of the oil throwing hole 2011, which forms multiple spraying paths. The oil throwing holes 2011 connected by different oil paths form different spraying areas on the circumferential surface of the rotor core 201, which cools and lubricates the components around the rotor core 201 from multiple angles and positions, greatly enriching the cooling and lubrication mode and coverage.

[0080] In addition, the openings of the oil throwing holes 2011 connected with the fourth oil path 2024 face the winding 105, and the cooling liquid can be directly sprayed to the surface of the winding 105 to form a local cooling cycle. This not only can effectively reduce the temperature of the winding 105, but also can form a relatively low temperature environment around the winding 105, further improving the heat dissipation efficiency of the key heat generating parts of the stator 100.

[0081] Exemplarily, along the circumferential direction of the rotor core 201, the second oil passage 2022 is arranged at the center of the rotor core 201. Along the radial direction of the rotor core 201, the distance between the oil throwing hole 2011 of the third oil passage 2023 and the third space S3 is one fourth of the difference between the diameter of the rotor core 201 and the diameter of the third space S3. Of course, the distance between the oil throwing hole 2011 of the third oil passage 2023 and the third space S3 can also be one half of the difference between the diameter of the rotor core 201 and the diameter of the third space S3. The present application is only exemplary.

[0082] The distance between the oil throwing hole 2011 of the first sub-passage 2024a and the third space S3 is three fourths of the difference between the diameter of the rotor core 201 and the diameter of the third space S3.

[0083] In addition, the first sub-passage 2024a and the third oil passage 2023 can coincide with each other along the radial direction of the rotor core 201, or can not coincide with each other, or can partially coincide with each other and partially not coincide with each other, which is not limited by the present application.

[0084] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A stator characterized by, Comprising: a ring-shaped casing (101) with a liquid inlet (1011); a plurality of stator cores (102) arranged in the ring-shaped casing (101) along the axial direction of the ring-shaped casing (101), the end surface of the stator core (102) being provided with a plurality of liquid outlets (1021), and a cooling channel (104) being arranged between the end surface of the stator core (102) and the inner circumferential surface of the ring-shaped casing (101), the cooling channel (104) being communicated with the liquid inlet (1011) and the liquid outlet (1021); a ring-shaped cover (103) arranged on the end surface of the stator core (102) on at least one side along the circumferential direction of the ring-shaped casing (101), the ring-shaped cover (103) being provided with a ring-shaped channel and a plurality of spray holes, the ring-shaped channel being communicated with the liquid outlet (1021); the circumference of the ring-shaped cover (103) is less than or equal to half the circumference of the ring-shaped casing (101), and the ring-shaped cover (103) is arranged on the side of the stator core (102) facing away from the direction of gravity.

2. The stator of claim 1, wherein The space surrounded by the ring-shaped cover (103) is a first space (S1), and the spray holes are arranged on the side wall of the ring-shaped cover (103) facing the first space (S1).

3. The stator of claim 1, wherein The cooling channel (104) comprises a first portion (1041) and a second portion (1042), the first portion (1041) is parallel to the axial direction of the ring-shaped casing (101), the axis of the second portion (1042) intersects the first portion (1041), and the second portion (1042) extends away from the first portion (1041) along the direction of gravity, and the second portion (1042) is communicated with the side of the liquid outlet (1021) facing away from the ring-shaped cover (103).

4. A stator according to claim 3, characterised in that The first portion (1041) is communicated with the liquid inlet (1011).

5. A stator according to any one of claims 1-4, characterised in that Along the circumferential direction of the stator core (102), the stator core (102) is provided with a plurality of spaced liquid outlets (1021).

6. The stator of claim 2, wherein Further comprising: a winding (105) arranged in the first space (S1), and the winding (105) is connected to the inner circumferential surface of the stator core (102).

7. An electric machine characterized by Comprising: the stator (100) of any one of claims 1-6, the space surrounded by the stator core (102) is a second space (S2); a rotor (200) arranged in the second space (S2).

8. The electric machine of claim 7, wherein, The rotor (200) comprises: a rotor core (201) stacked along the axial direction of the ring-shaped casing (101), the space surrounded by the rotor core (201) is a third space, and the circumferential surface of the rotor core (201) is provided with a plurality of oil throwing holes (2011); the rotor core (201) is arranged on the side of the stator core (102) facing away from the direction of gravity. A rotating shaft (202) is rotatably arranged in the third space, and the rotating shaft (202) is provided with a first oil passage (2021); along the radial direction of the rotor core (201), the rotor core (201) is provided with a second oil passage (2022) in communication with the first oil passage (2021) and a third oil passage (2023) in communication with the second oil passage (2022); The first oil passage (2021) extends along the axial direction of the rotating shaft (202), the second oil passage (2022) extends along the radial direction of the rotor core (201), and the third oil passage (2023) communicates the second oil passage (2022) and part of the oil throwing holes (2011) in the plurality of oil throwing holes (2011).

9. The electric machine of claim 8, wherein, The rotor core (201) is further provided with a fourth oil passage (2024), the fourth oil passage (2024) and the third oil passage (2023) are arranged along the radial direction of the rotor core (201), and the fourth oil passage (2024) is communicated between another part of the oil throwing holes (2011) in the plurality of oil throwing holes (2011) and the second oil passage (2022); The fourth oil passage (2024) includes a first sub-passage (2024a) and a second sub-passage (2024b) connected in sequence, the first sub-passage (2024a) is connected with the oil throwing hole (2011), and the second sub-passage (2024b) is connected with the second oil passage (2022); the opening of the oil throwing hole (2011) connected with the first sub-passage (2024a) faces the annular shell (101), and along the radial direction of the annular shell (101), the oil throwing hole (2011) is located between the second sub-passage (2024b) and the annular shell (101).

10. A vehicle characterized by comprising: Comprise: The motor of any one of claims 7-9.

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