Cooling structure, electric machine, and vehicle

Abstract

The application discloses a cooling structure, a motor and a vehicle, and solves the technical problem of poor cooling effect in the prior art. The cooling structure is applied to a stator comprising a tooth portion and a yoke portion sleeved outside the tooth portion. The yoke portion is provided with an oil guide groove and an oil inlet. The oil guide groove is located on an inner circumferential wall of the yoke portion, and the oil inlet penetrates through a side wall of the yoke portion and communicates with the oil guide groove. Cooling oil channels are arranged on at least one of an outer circumferential wall of the tooth portion and an inner circumferential wall of the yoke portion, and the length of the cooling oil channels is smaller than the axial length of the stator. One end of the cooling oil channels extends to an end face of the tooth portion or the yoke portion, and the cooling oil channels communicate with the oil guide groove. The cooling structure disclosed by the application realizes effective cooling of the inside of the stator by arranging the cooling oil channels on the tooth portion and / or the yoke portion of the stator and communicating the cooling oil channels with the oil guide groove, and can make the coolant directly spray to the winding end portion, significantly reduces the temperature of the stator, and improves the operation efficiency and stability of the motor.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of stator oil cooling, and particularly relates to a cooling structure, a motor and a vehicle. BACKGROUND

[0002] The working principle of the stator oil cooling technology is to inject special oil into the motor stator, and to cool and circulate the oil by using an oil circuit system, so as to achieve the purpose of stabilizing the working temperature. During the operation of the motor, the temperature inside the stator will rise due to the generation of electric Joule heat, and the heat sink inside the stator cannot completely dissipate the heat. At this time, by injecting special oil and utilizing its heat conduction characteristics, the oil can circulate inside the stator, and the heat can be evenly distributed to the entire stator, thereby achieving the effect of reducing the temperature.

[0003] However, the existing cooling design can only make the cooling oil flow and cool along the radial direction of the core, and the cooling effect is poor. SUMMARY

[0004] To solve the above technical problems, the application provides a cooling structure, a motor and a vehicle.

[0005] The technical scheme adopted to achieve the purpose of the application is as follows. In a first aspect of the application, a cooling structure is disclosed, which is applied to a stator comprising a tooth portion and a yoke portion sleeved outside the tooth portion;

[0006] The yoke portion is provided with an oil guide groove and an oil inlet, the oil guide groove is located on the inner circumferential wall of the yoke portion, and the oil inlet penetrates the side wall of the yoke portion and communicates with the oil guide groove;

[0007] At least one of the outer circumferential wall of the tooth portion and the inner circumferential wall of the yoke portion is provided with a cooling oil channel, the length of the cooling oil channel is less than the axial length of the stator, one end of the cooling oil channel extends to the end face of the tooth portion or the yoke portion, and the cooling oil channel communicates with the oil guide groove.

[0008] In some embodiments, the cooling oil channel is respectively arranged at both ends of the tooth portion and / or the yoke portion, and the cooling oil channels located at both ends of the tooth portion and the yoke portion are respectively located on both sides of the oil guide groove.

[0009] In some embodiments, the cooling oil channel is respectively arranged at both ends of the yoke portion.

[0010] The groove wall of the oil guide groove abuts against the outer circumferential wall of the tooth portion, and the projection of the groove wall of the oil guide groove along the axial direction of the stator is a closed circle.

[0011] In some embodiments, the oil guide groove is spiral-shaped.

[0012] In some embodiments, the tooth portion is provided with two cooling oil channels respectively at two ends thereof;

[0013] The sum of the axial lengths of the cooling oil channels at the two ends of the tooth portion is less than the axial length of the tooth portion; and / or

[0014] The cooling oil channels at the two ends of the tooth portion are distributed in a circumferential staggered manner along the tooth portion.

[0015] In some embodiments, the cooling oil channels are provided in a plurality, each of the cooling oil channels is distributed in a circumferential interval manner along the tooth portion or the yoke portion, and an annular groove is provided on the outer circumferential wall of the tooth portion and / or the inner circumferential wall of the yoke portion, the annular groove being communicated between the oil guide groove and each of the cooling oil channels on the same side.

[0016] In some embodiments, the cooling oil channels are provided on the outer circumferential wall of the tooth portion and the inner circumferential wall of the yoke portion, and the cooling oil channels on the tooth portion are oppositely arranged with the cooling oil channels on the yoke portion.

[0017] In some embodiments, the cooling oil channel is provided with a protruding structure protruding towards the inner cavity.

[0018] To achieve the above object, the technical scheme adopted by the present application is as follows: in the second aspect of the present application, the present application further discloses an electric machine comprising a stator, wherein the stator is provided with the cooling structure of the first aspect.

[0019] To achieve the above object, the technical scheme adopted by the present application is as follows: in the third aspect of the present application, the present application further discloses a vehicle comprising the electric machine of the second aspect.

[0020] As can be seen from the above technical scheme, the cooling structure disclosed by the present application is applied to a stator comprising a tooth portion and a yoke portion sleeved outside the tooth portion. The yoke portion is provided with an oil guide groove and an oil inlet. The oil guide groove is located on the inner circumferential wall of the yoke portion, and the oil inlet penetrates through the side wall of the yoke portion and is communicated with the oil guide groove. At least one of the outer circumferential wall of the tooth portion and the inner circumferential wall of the yoke portion is provided with a cooling oil channel, and the length of the cooling oil channel is less than the axial length of the stator. One end of the cooling oil channel extends to the end face of the tooth portion or the yoke portion, and the cooling oil channel is communicated with the oil guide groove.

[0021] The cooling structure disclosed by the present application realizes effective cooling of the inside of the stator by providing a cooling oil channel on the tooth portion and / or the yoke portion of the stator and being communicated with the oil guide groove, and can enable the coolant to directly spray to the winding end portion, thereby significantly reducing the temperature of the stator and improving the operation efficiency and stability of the electric machine. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to enable those skilled in the art to understand the present application more clearly, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of this application.

[0023] Figure 1 An exploded schematic diagram of a cooling structure in one or more embodiments of the present application;

[0024] Figure 2 A schematic top view of a cooling structure in one or more embodiments of the present application;

[0025] Figure 3 for Figure 2 A local enlarged schematic diagram at point A;

[0026] Figure 4 for Figure 2 Schematic diagram of the middle tooth section;

[0027] Figure 5 for Figure 2 Schematic diagram of the yoke;

[0028] Figure 6 for Figure 1 Schematic cross-sectional view of the yoke.

[0029] Description of reference numerals:

[0030] 100-tooth portion, 200-yoke portion, 210-oil inlet, 220-oil guide groove, 230-ring groove, 300-cooling oil channel, 310-protrusion structure. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to understand the present application more clearly, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of this application.

[0032] Moreover, the reference numerals and / or letters in the various examples can be repeated in different instances in this application for the sake of simplicity and clarity and do not indicate a relationship between the various embodiments and / or aspects discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize that other processes can be applied and / or other materials can be used.

[0033] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0034] The cooling structure disclosed in the embodiments of the present application can solve the technical problem of poor cooling effect in the prior art, thereby effectively improving the heat dissipation efficiency of the motor stator, reducing the stator temperature, and further improving the overall performance and operation stability of the motor.

[0035] The technical solutions of the present application will be described in detail below through specific embodiments:

[0036] Referring to Figure 1 , Figure 2 and Figure 6 , in the first aspect of the present application, a cooling structure is provided, which is applied to a stator including a tooth portion 100 and a yoke portion 200 sleeved outside the tooth portion 100. The yoke portion 200 is provided with an oil guide groove 220 and an oil inlet 210. The oil guide groove 220 is located on the inner circumferential wall of the yoke portion 200, and the oil inlet 210 penetrates the side wall of the yoke portion 200 and communicates with the oil guide groove 220. At least one of the outer circumferential wall of the tooth portion 100 and the inner circumferential wall of the yoke portion 200 is provided with a cooling oil channel 300, and the length of the cooling oil channel 300 is less than the axial length of the stator. One end of the cooling oil channel 300 extends to the end face of the tooth portion 100 or the yoke portion 200, and the cooling oil channel 300 communicates with the oil guide groove 220.

[0037] The cooling structure disclosed in the embodiments can realize effective cooling of the inside of the stator by providing the cooling oil channel 300 on the tooth portion 100 and / or the yoke portion 200 and communicating with the oil guide groove 220, and can enable the coolant to be directly sprayed to the winding end portion, thereby significantly reducing the stator temperature and improving the operation efficiency and stability of the motor.

[0038] In the present embodiment, it is possible to provide the cooling oil channel 300 only on the tooth portion 100, or only on the yoke portion 200, or on both the tooth portion 100 and the yoke portion 200.

[0039] Among them, different coolants may be used according to different situations, and in the present embodiment, cooling oil can be used to cool the tooth portion 100 and the yoke portion 200 and the winding of the stator. The cooling oil can directly circulate in the tooth portion 100 and the yoke portion 200.

[0040] Referring to Figure 2 , Figure 3 , Figure 4 and Figure 5 In one embodiment, cooling oil channels 300 are provided at both ends of the tooth portion 100 and / or the yoke portion 200, and are located on both sides of the oil guide groove 220. By providing cooling oil channels 300 at both ends, the coolant has a faster circulation speed and a larger contact area with the stator, thereby improving the cooling effect.

[0041] In the stator structure, the tooth portion 100 is the core part of electromagnetic conversion, and its surface is prone to accumulate heat. The yoke portion 200 serves to support and protect the tooth portion 100, and also needs to be effectively cooled to maintain the stability of the overall temperature. Therefore, cooling oil channels 300 are provided at both ends of the tooth portion 100 or the yoke portion 200, and these cooling oil channels 300 are arranged in a specific manner to ensure that the coolant can fully contact and carry away the heat on the surface of the stator.

[0042] The cooling oil channels 300 located at both ends of the tooth portion 100 and the yoke portion 200 are designed to be located on both sides of the oil guide groove 220. The advantage of this layout is that it can promote the uniform distribution of the coolant inside the stator. When the coolant enters the oil guide groove 220 through the oil inlet 210, it can flow to the cooling oil channels 300 of the tooth portion 100 and the yoke portion 200 at the same time, thereby achieving overall cooling of the stator. In addition, this layout helps to reduce the resistance and pressure loss of the coolant during flow, improving the efficiency of the cooling system.

[0043] In specific implementation, the number and position of the cooling oil channels 300 can be adjusted according to the size, shape and expected heat dissipation requirements of the stator. For example, one or more cooling oil channels 300 can be provided at each end of the tooth portion 100 and the yoke portion 200 to ensure sufficient cooling capacity. At the same time, the shape and size of the cooling oil channels 300 can also be optimized to further improve the heat dissipation efficiency.

[0044] Referring to Figure 6 In one embodiment, cooling oil channels 300 are provided at both ends of the yoke portion 200. The groove wall of the oil guide groove 220 abuts against the outer peripheral wall of the tooth portion 100, so that the coolant can only enter the cooling oil channels 300 along the oil guide groove 220, and then be sprayed onto the windings at both ends along the cooling oil channels 300, thereby improving the cooling effect. The projection of the groove wall of the oil guide groove 220 along the axial direction of the stator is a closed circle. This can ensure that the cooling oil channels 300 do not directly penetrate the stator along the axial direction of the stator, thereby avoiding affecting the magnetic flux of the stator.

[0045] The oil guide groove 220 serves as the main channel for coolant flow, and its design is crucial for the efficiency of the entire cooling system. In the present application, the groove walls of the oil guide groove 220 are designed to tightly abut the outer peripheral wall of the tooth portion 100. This design not only helps ensure that the coolant can fully contact the surface of the tooth portion 100, effectively removing the heat generated by the tooth portion 100, but also enhances the heat transfer efficiency between the tooth portion 100 and the yoke portion 200.

[0046] In one embodiment, the oil guide groove 220 is spiral-shaped. The spiral-shaped oil guide groove 220 can guide the coolant to flow along a longer path, thereby increasing the contact time and contact area of the coolant with the surface of the stator (including the tooth portion 100 and the yoke portion 200). This helps to more effectively remove the heat generated on the surface of the stator, improving cooling efficiency. The spiral design allows the coolant to be more evenly distributed within the stator during flow, avoiding local overheating or insufficient cooling. At the same time, this design helps to reduce the resistance and pressure loss of the coolant during flow, further improving the efficiency of the cooling system.

[0047] The spiral-shaped oil guide groove 220 can achieve a longer cooling path within the limited stator space, thereby improving the compactness of the cooling structure. This is of great significance for reducing the size of the motor and improving power density. The spiral-shaped oil guide groove 220 can guide the coolant to form a vortex or turbulent flow within the stator, thereby enhancing the heat transfer effect. This flow state helps to more effectively transfer the heat within the stator to the coolant, accelerating heat dissipation.

[0048] Of course, setting the oil guide groove 220 to be spiral-shaped is only one embodiment in the present application, and in other embodiments, the oil guide groove 220 can also be set to other shapes.

[0049] In one embodiment, the oil guide groove 220 is set to one. One oil guide groove 220 can already guide the flow of coolant well, but in other embodiments, the oil guide groove 220 can be set to multiple, and then a ring-shaped communication groove is designed to communicate each oil guide groove 220, and the ring-shaped communication groove is in communication with the oil inlet 210, so that the coolant can flow in multiple oil guide grooves 220 at the same time.

[0050] Referring to Figure 1 In one embodiment, the tooth portion 100 is provided with cooling oil channels 300 at both ends. The sum of the axial lengths of the cooling oil channels 300 at both ends of the tooth portion 100 is less than the axial length of the tooth portion 100; and / or the cooling oil channels 300 at both ends of the tooth portion 100 are distributed in a circumferential staggered manner along the tooth portion 100.

[0051] In the embodiment, there are various implementation manners to ensure that the cooling oil channel 300 on the tooth portion 100 does not penetrate the tooth portion 100 along the axial direction of the tooth portion 100.

[0052] The first setting manner is that the axial length of the cooling oil channel 300 at both ends of the tooth portion 100 is less than the axial length of the tooth portion 100, and the cooling oil channels 300 at both ends of the tooth portion 100 are oppositely arranged.

[0053] The second setting manner is that the axial length of the cooling oil channel 300 at both ends of the tooth portion 100 is less than the axial length of the tooth portion 100, and the cooling oil channels 300 at both ends of the tooth portion 100 are staggered.

[0054] The third setting manner is that the axial length of the cooling oil channel 300 at both ends of the tooth portion 100 is greater than or equal to the axial length of the tooth portion 100, and the cooling oil channels 300 at both ends of the tooth portion 100 are staggered.

[0055] The existing stator directly sets a cooling oil channel penetrating the stator along the axial direction of the stator to enable the coolant to directly spray on the winding, which affects the magnetic flux of the stator and further affects the working performance of the motor.

[0056] The cooling structure disclosed in the embodiment avoids the cooling oil channel 300 penetrating the yoke portion 200 along the axial direction of the yoke portion 200 while ensuring that the coolant can spray on the winding at both ends, and the middle of the cooling oil channel 300 at both ends of the yoke portion 200 is further spaced from the groove wall of the oil guide groove 220, thereby avoiding affecting the magnetic flux of the stator.

[0057] In an embodiment, the oil inlet 210 is arranged at the middle position in the axial direction of the yoke portion 200, to ensure that the coolant flows to both ends of the yoke portion 200 by an equal distance after entering the oil guide groove 220 from the oil inlet 210. In addition, the diameter of the oil inlet 210 can be greater than the width of the oil guide groove 220, to ensure that sufficient coolant can flow in the oil guide groove 220 in different directions after entering the oil guide groove 220, thereby ensuring that sufficient coolant can be sprayed on the winding at both ends of the stator.

[0058] Referring to Figure 1 and Figure 6 In an embodiment, the cooling oil channel 300 is arranged in multiple numbers, and each cooling oil channel 300 is spaced along the circumferential direction of the tooth portion 100 or the yoke portion 200. By reasonably arranging the cooling oil channel 300, the heat dissipation capacity of the coolant can be maximized, and unnecessary influence on the structural strength of the tooth portion 100 or the yoke portion 200 can be avoided.

[0059] The ring groove 230 is arranged on the outer circumferential wall of the tooth portion 100 and / or the inner circumferential wall of the yoke portion 200, and communicates between the oil guide groove 220 and each cooling oil channel 300 on the same side.

[0060] The ring groove 230 is arranged on the outer circumferential wall of the tooth portion 100 and / or the inner circumferential wall of the yoke portion 200, and communicates between the oil guide groove 220 and each cooling oil channel 300 on the same side.

[0061] Since the yoke portion 200 and the tooth portion 100 are tightly fitted, the slide groove can communicate with the oil guide groove 220 on the tooth portion 100 and the yoke portion 200 by arranging the ring groove 230 on one of the yoke portion 200 and the tooth portion 100.

[0062] Since the cooling oil channel 300 can be arranged on the yoke portion 200 or the tooth portion 100, the distribution of the ring groove 230 and the cooling oil channel 300 in the embodiment has the following modes.

[0063] The first distribution mode: the ring groove 230 is arranged only on the yoke portion 200, and the cooling oil channel 300 is arranged only on the yoke portion 200.

[0064] The second distribution mode: the ring groove 230 is arranged only on the yoke portion 200, and the cooling oil channel 300 is arranged only on the tooth portion 100.

[0065] The third distribution mode: the ring groove 230 is arranged only on the tooth portion 100, and the cooling oil channel 300 is arranged only on the tooth portion 100.

[0066] The fourth distribution mode: the ring groove 230 is arranged only on the tooth portion 100, and the cooling oil channel 300 is arranged only on the yoke portion 200.

[0067] The fifth distribution mode: the ring groove 230 is arranged only on the yoke portion 200, and the cooling oil channel 300 is arranged on the tooth portion 100 and the yoke portion 200.

[0068] The sixth distribution mode: the ring groove 230 is arranged only on the tooth portion 100, and the cooling oil channel 300 is arranged on the tooth portion 100 and the yoke portion 200.

[0069] The seventh distribution mode: the ring groove 230 is arranged on the yoke portion 200 and the yoke portion 200, and the cooling oil channel 300 is arranged only on the tooth portion 100.

[0070] The eighth distribution mode: the ring groove 230 is arranged on the tooth portion 100 and the yoke portion 200, and the cooling oil channel 300 is arranged only on the tooth portion 100;

[0071] The ninth distribution mode: the ring groove 230 is arranged on the tooth portion 100 and the yoke portion 200, and the cooling oil channel 300 is arranged on the tooth portion 100 and the yoke portion 200.

[0072] The arrangement of the ring groove 230 enables the coolant to be quickly dispersed into each cooling oil channel 300 after flowing through the oil guide groove 220, thereby achieving a more uniform cooling effect. At the same time, the ring groove 230 can also guide the coolant to form a more complex flow path inside the tooth portion 100 or the yoke portion 200, thereby enhancing the heat transfer effect. By increasing the contact area and contact time of the coolant with the surface of the tooth portion 100 or the yoke portion 200, the ring groove 230 can significantly improve the cooling efficiency. This helps to more effectively remove the heat generated on the surface of the stator, thereby reducing the stator temperature and improving the operating stability and reliability of the motor.

[0073] In one embodiment, the cooling oil channel 300 is arranged on the outer peripheral wall of the tooth portion 100 and the inner peripheral wall of the yoke portion 200, and the cooling oil channel 300 on the tooth portion 100 is arranged opposite to the cooling oil channel 300 on the yoke portion 200. The cooling oil channel 300 on the outer peripheral wall of the tooth portion 100 is spaced apart along the circumferential direction of the tooth portion 100 to ensure that the coolant can uniformly contact and remove the heat generated on the surface of the tooth portion 100. The cooling oil channel 300 on the inner peripheral wall of the yoke portion 200 is also spaced apart along the circumferential direction of the yoke portion 200 and is arranged opposite to the cooling oil channel 300 on the outer peripheral wall of the tooth portion 100.

[0074] By arranging the cooling oil channel 300 on the tooth portion 100 opposite to the cooling oil channel 300 on the yoke portion 200, it can be ensured that the coolant can form a more direct heat transfer path when flowing through the tooth portion 100 and the yoke portion 200. This helps to more effectively remove the heat generated inside the stator, thereby improving the cooling efficiency. The oppositely arranged cooling oil channels 300 can guide the coolant to form a more complex flow path inside the stator, thereby increasing the contact area and contact time of the coolant with the surface of the stator. This helps to further improve the heat dissipation efficiency and reduce the stator temperature. By reasonably arranging the cooling oil channels 300 on the tooth portion 100 and the yoke portion 200, a more efficient cooling effect can be achieved in a limited stator space. This helps to reduce the size of the motor, improve the power density, and meet the demand for compactness and high performance of modern motors.

[0075] Of course, the arrangement of the cooling oil channel 300 on the tooth portion 100 opposite to the cooling oil channel 300 on the yoke portion 200 is only one embodiment in this embodiment, and in other embodiments, the cooling oil channel 300 on the tooth portion 100 can be arranged opposite to the cooling oil channel 300 on the yoke portion 200.

[0076] In one embodiment, the tooth portion 100 is provided with a plurality of protruding structures for winding the winding, and the plurality of protruding structures are arranged along the circumferential direction of the tooth portion 100. The cooling oil channel 300 can be arranged opposite to the protruding structures. In this way, the coolant sprayed from the cooling oil channel 300 can directly fall on the winding, avoiding the coolant falling into the gap between adjacent windings, and the cooling effect can be further improved.

[0077] Referring to Figure 3 In one embodiment, the cooling oil channel 300 is provided with protruding structures 310 protruding towards the inner cavity. These protruding structures 310 can take various shapes, such as ribs, fins, corrugations, etc., depending on the structural design of the motor and the cooling requirements. The main function of the protruding structures 310 is to increase the contact area between the coolant and the stator surface, and to guide the coolant to form a more complex flow path inside the stator to enhance the heat transfer effect.

[0078] The protruding structures 310 can significantly increase the contact area between the coolant and the stator surface, thereby improving the heat transfer efficiency. This helps to more effectively remove the heat generated inside the stator, reducing the stator temperature. The protruding structures 310 can guide the coolant to form a vortex or turbulent flow inside the stator, increasing the flow rate and flow range of the coolant. This complex flow path helps to further improve the heat dissipation efficiency, ensuring that the coolant can uniformly flow through each part of the stator. In some cases, the protruding structures 310 can also serve to enhance the structural strength of the stator. By increasing the support structure inside the stator, the protruding structures 310 can improve the anti-deformation ability and durability of the stator.

[0079] To further optimize the effect of the protruding structures 310, the shape, number, distribution, etc. of the protruding structures 310 can also be adjusted. For example, the positions and numbers of the protruding structures 310 can be reasonably arranged according to the heat distribution of the stator and the cooling requirements, to ensure that the coolant can more effectively remove heat. At the same time, the shape and size of the protruding structures 310 can also be adjusted to optimize the flow path and flow rate of the coolant, further improving the heat dissipation efficiency.

[0080] In one embodiment, the cross section of the cooling oil channel 300 can be semicircular, and the cross section of the protruding structure 310 is also semicircular, so that the shape of the cooling oil channel 300 is as shown in Figure 3 Of course, making the shapes of the cooling oil channel 300 and the protruding structure 310 semicircular is only one embodiment in this embodiment, and the semicircular shape has a better area expansion effect, but in other embodiments, the shapes of the cooling oil channel 300 and the protruding structure 310 can also be set to be elliptical or polygonal.

[0081] Through the above embodiments, the application has the following beneficial effects or advantages: the cooling structure disclosed in the application realizes efficient cooling of the stator by optimizing the arrangement of the cooling oil channel 300, the oil guide groove 220, and the protruding structure 310, and improves the compactness, reliability, and performance of the motor. Meanwhile, the cooling structure also provides strong support for the overall performance improvement of the vehicle. By arranging the cooling oil channel 300 on the tooth portion 100 and / or the yoke portion 200 of the stator and communicating with the oil guide groove 220, effective cooling of the interior of the stator is realized, and the coolant can be directly sprayed to the winding end portion, thereby significantly reducing the temperature of the stator and improving the operating efficiency and stability of the motor. The cooling oil channel 300 does not penetrate the stator along the axial direction of the stator, and can effectively avoid affecting the magnetic flux property of the stator. The protruding structure 310 arranged on the cooling oil channel 300 protrudes towards the inner cavity, increases the contact area between the cooling oil and the surface of the stator, reduces the flow resistance of the coolant, and further improves the heat transfer efficiency. The design of the cooling structure can make the coolant as close as possible to the stator winding, and the coolant can sufficiently cool the stator core and the winding portion. By separating the tooth portion 100 and the yoke portion 200 of the stator, the iron loss of the motor stator core can also be reduced, thereby further improving the operating efficiency of the motor.

[0082] Based on the same inventive concept, the second aspect embodiment of the application discloses a motor, which comprises a stator configured with the cooling structure of any one of the first aspect embodiments.

[0083] The motor applying the cooling structure of the application can operate stably for a long time due to the effective cooling of the stator, and the failure and downtime caused by overheating are reduced. Meanwhile, due to the improvement of the cooling efficiency, the heat dissipation performance of the motor is also significantly improved, which helps to improve the overall performance and efficiency of the motor.

[0084] Based on the same inventive concept, the third aspect embodiment of the application discloses a vehicle with the motor of the second aspect.

[0085] The vehicle equipped with the motor of the application has significantly improved power performance, economy, and reliability due to the improvement of the performance of the motor. In addition, due to the improvement of the heat dissipation performance of the motor, the operating stability of the vehicle in a high-temperature environment is also enhanced.

[0086] In order to make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme of the embodiments of the application is described clearly and completely above in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, not all the embodiments. The components of the embodiments of the application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0087] Therefore, the above detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the application, without making creative efforts, fall within the scope of the application.

[0088] It should be noted that similar reference numbers and letters in the following drawings represent similar items, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0089] In the description of the application, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0090] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0091] In the present application, unless otherwise explicitly specified and limited, the first feature above or below the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature above, above and above the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature below, below and below the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0092] Although the preferred embodiments of the present application have been described, those of ordinary skill in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0093] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A cooling structure applied to a stator comprising a tooth portion and a yoke portion sleeved outside the tooth portion, characterized in that: The yoke is provided with an oil guide groove and an oil inlet, wherein the oil guide groove is located on the inner peripheral wall of the yoke, and the oil inlet passes through the side wall of the yoke and is communicated with the oil guide groove; A cooling oil channel is provided on at least one of the outer peripheral wall of the tooth portion and the inner peripheral wall of the yoke portion, wherein the length of the cooling oil channel is less than the axial length of the stator, one end of the cooling oil channel extends to the end surface of the tooth portion or the yoke portion, and the cooling oil channel is communicated with the oil guide groove; A groove wall of the oil guide groove abuts against an outer peripheral wall of the tooth portion, and a projection of the groove wall of the oil guide groove along the axial direction of the stator is a closed circle.

2. The cooling structure according to claim 1, characterized in that: The cooling oil channels are respectively provided at both ends of the tooth portion and / or the yoke portion, and the cooling oil channels at both ends of the tooth portion and the yoke portion are respectively located on both sides of the oil guide groove.

3. The cooling structure according to claim 2, characterized in that: The cooling oil channels are respectively provided at both ends of the yoke.

4. The cooling structure according to claim 3, characterized in that: The oil guide groove is spiral-shaped.

5. The cooling structure according to claim 2, characterized in that: The cooling oil channels are respectively provided at both ends of the tooth portion; The sum of the axial lengths of the cooling oil channels located at both ends of the tooth portion is less than the axial length of the tooth portion; and / or The cooling oil channels located at both ends of the tooth portion are staggered and distributed along the circumference of the tooth portion.

6. The cooling structure according to claim 2, characterized in that: There are multiple cooling oil channels, and each cooling oil channel is distributed at intervals along the circumference of the tooth portion or the yoke portion. An annular groove connected to the oil guide groove is provided on the outer circumferential wall of the tooth portion and / or the inner circumferential wall of the yoke portion, and the annular groove is connected between the oil guide groove and each cooling oil channel located on the same side.

7. The cooling structure according to any one of claims 1 to 6, characterized in that: The cooling oil channels are both provided on the outer peripheral wall of the tooth portion and the inner peripheral wall of the yoke portion, and the cooling oil channels on the tooth portion are arranged opposite to the cooling oil channels on the yoke portion.

8. The cooling structure according to any one of claims 1 to 6, characterized in that: The cooling oil channel is provided with a protruding structure protruding toward the inner cavity.

9. A motor, characterized in that: The invention comprises a stator, wherein the stator is provided with the cooling structure according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the motor as claimed in claim 9.

Images