Electric drive stator cooling structure, motor cooling system and motor

Abstract

The invention relates to an electrically-driven stator cooling structure, a motor cooling system and a motor, the motor cooling system comprises a shell, the shell is provided with an oil inlet pipe for receiving external cooling oil, the electrically-driven stator cooling structure is arranged in the shell, and the electrically-driven stator cooling structure comprises an oil spraying ring, an iron core and a stator winding. A plurality of oil spraying holes are formed in the oil spraying ring; one end of the iron core is connected with the oil spraying ring, a channel and a plurality of oil guide holes are formed in the iron core in a penetrating mode, a containing cavity is defined by the end, close to the oil spraying ring, of the iron core, the peripheral wall of the oil spraying ring and the inner wall of the shell, and the containing cavity communicates with the oil inlet pipe, the oil guide holes and the oil spraying holes; the stator winding is arranged in the channel, one end of the stator winding extends into the oil spraying ring, and the other end of the stator winding extends out of the channel. The distribution and circulation functions of the cooling oil are integrated on the iron core, the design of the cooling structure is simplified, the number of cooling parts is reduced, and therefore the electric drive stator cooling structure is convenient to produce and manufacture and follow-up overhaul.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to an electric drive stator cooling structure, a motor cooling system and a motor. Background Art

[0002] As the speed and power of new energy vehicle drive motors increase, the demand for cooling is also increasing, and the cooling system of the electric drive system is gradually moving towards oil cooling. In order to more efficiently use cooling oil to cool the motor system, the demand for oil circuit design of the motor stator core is also increasing.

[0003] In the related art, in order to meet the efficient cooling requirements of the motor, the traditional motor cooling system has a complex structural design and a large number of parts, which is not conducive to production and subsequent maintenance. Summary of the invention

[0004] Based on this, it is necessary to provide an electric drive stator cooling structure, a motor cooling system and a motor to address the problem that the motor cooling system in the related technology has a complex structure that is not conducive to production and subsequent maintenance.

[0005] In a first aspect, the present application provides an electric drive stator cooling structure, which is applicable to a motor cooling system. The motor cooling system includes a housing, and an oil inlet pipe for receiving external cooling oil is provided on the housing. The electric drive stator cooling structure is arranged in the housing, and the electric drive stator cooling structure includes:

[0006] An oil pouring ring, wherein a plurality of oil pouring holes are provided on the peripheral side wall of the oil pouring ring;

[0007] An iron core, one end of which is connected to the oil pouring ring, a passage is provided through the iron core along its own axial direction, a plurality of oil guide holes are provided through the end wall of the iron core along its own length direction, and an end wall of the iron core close to one end of the oil pouring ring, an outer peripheral wall of the oil pouring ring and an inner wall of the shell form a receiving cavity, and the receiving cavity is connected with the oil inlet pipe, the oil guide hole and the oil pouring hole;

[0008] The stator winding is arranged in the channel and connected to the inner wall of the iron core. One end of the stator winding extends into the oil spraying ring, and the other end of the stator winding extends out of the channel.

[0009] In one embodiment, the core includes:

[0010] A first sub-core group, the first sub-core group is arranged close to the oil pouring ring, the first sub-core group includes a plurality of first sub-cores, and a plurality of first oil holes are penetrated on the end wall of the first sub-core along its own length direction;

[0011] A second sub-core, wherein a plurality of second oil holes are provided on the end wall of the second sub-core along its length direction;

[0012] A third sub-core, wherein a plurality of third oil holes are provided on the end wall of the third sub-core along its length direction;

[0013] The third oil hole, the second oil hole and the first oil hole located on the same flow path of the cooling oil are connected to form an oil guide hole.

[0014] In one embodiment, the first oil hole is disposed close to the outer diameter of the first sub-core.

[0015] In one embodiment, the extension direction of the second oil hole is arranged along the radial direction of the second sub-core, and the cross-sectional area of ​​the second oil hole is larger than the cross-sectional area of ​​the first oil hole.

[0016] In one embodiment, an end of the second oil hole away from the first oil hole is located between two adjacent tooth slots of the second sub-core.

[0017] In one embodiment, the cross-sectional width of the second oil hole gradually decreases from an end close to the first oil hole to an end far away from the first oil hole.

[0018] In one embodiment, a cross-sectional area of ​​the third oil hole is smaller than a cross-sectional area of ​​the first oil hole.

[0019] In one embodiment, the third oil hole is connected to an end of the second oil hole away from the first oil hole.

[0020] In a second aspect, the present application provides a motor cooling system, comprising any one of the electric drive stator cooling structures provided in the first aspect, and the motor cooling system further comprises:

[0021] A housing, wherein an oil inlet pipe for receiving external cooling oil is provided on the housing, and an electric drive stator cooling structure is arranged in the housing;

[0022] A cold and heat exchanger, wherein the oil outlet of the cold and heat exchanger is connected with the oil inlet pipe.

[0023] In a third aspect, the present application provides a motor, comprising the motor cooling system provided in the second aspect.

[0024] The above-mentioned electric drive stator cooling structure is suitable for a motor cooling system. The motor cooling system includes a shell, and the shell is provided with an oil inlet pipe for receiving external cooling oil. The electric drive stator cooling structure is arranged in the shell, and the electric drive stator cooling structure includes an oil spraying ring, an iron core and a stator winding. A plurality of oil spraying holes are penetrated on the peripheral side wall of the oil spraying ring; one end of the iron core is connected to the oil spraying ring, and a channel is penetrated through the iron core along its own axial direction, and a plurality of oil guide holes are penetrated on the end wall of the iron core along its own length direction. The end wall of the iron core close to one end of the oil spraying ring, the outer peripheral wall of the oil spraying ring and the inner wall of the shell form a accommodating cavity, and the accommodating cavity is connected with the oil inlet pipe, the oil guide hole and the oil spraying hole; the stator winding is arranged in the channel and connected to the inner wall of the iron core, one end of the stator winding extends into the oil spraying ring, and the other end of the stator winding extends out of the channel. The electric drive stator cooling structure in the present application, after the accommodating cavity is filled with cooling oil, a part of the cooling oil is sprayed to cool one end of the stator winding through a plurality of oil spray holes on the oil spray ring, and the other part of the cooling oil is sprayed to cool the other end of the stator winding through a plurality of oil guide holes on the iron core, and at the same time, the heat generated by the iron core when the motor is working can be taken away to realize the cooling of the iron core, that is, only the iron core and an oil spray ring are required to cool both ends of the iron core and the stator winding; and the distribution and circulation functions of the cooling oil are integrated into the structure of the iron core, which simplifies the design of the cooling structure and reduces the number of cooling components, thereby making the electric drive stator cooling structure simple and light, which is conducive to production and subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic diagram of the structure of the motor cooling system in some embodiments of the present application;

[0027] Figure 2 This is a schematic diagram of the structure of the electric drive stator cooling structure in some embodiments of the present application;

[0028] Figure 3 This is a structural schematic diagram for reflecting the connection relationship between the first sub-core group, the second sub-core, the third sub-core, the oil pouring ring and the stator winding in some embodiments of the present application;

[0029] Figure 4 This is a structural schematic diagram for reflecting the connection relationship between the first sub-core group, the second sub-core and the third sub-core in some embodiments of the present application;

[0030] Figure 5 A schematic diagram of a distribution structure of first oil holes on a first sub-core in some embodiments of the present application;

[0031] Figure 6 This is a schematic diagram for reflecting the distribution structure of the second oil holes on the second sub-core in some embodiments of the present application;

[0032] Figure 7 This is a schematic diagram for reflecting the distribution structure of the third oil holes on the third sub-core in some embodiments of the present application;

[0033] Figure 8 This is a schematic diagram of the structure used to reflect the cooperation of the second sub-core and the third sub-core in some embodiments of the present application.

[0034] Description of Figure Numbers:

[0035] 100. Motor cooling system; 110. Housing; 120. Oil inlet pipe; 130. Heat exchanger; 140. Accommodation chamber; 200. Electric drive stator cooling structure; 210. Oil spray ring; 212. Oil spray hole; 220. Iron core; 221. First sub-iron core group; 222. First oil hole; 223. Second sub-iron core; 224. Second oil hole; 225. Third sub-iron core; 226. Third oil hole; 227. Tooth slot; 230. Stator winding. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0042] In order to solve the problem in the related art that the motor cooling system has a complex structure that is not conducive to production and subsequent maintenance, an electric drive stator cooling structure, a motor cooling system and a motor are provided. In the first aspect, referring to Figures 1 to 4An embodiment of the present application provides an electric drive stator cooling structure, which is applicable to a motor cooling system 100. The motor cooling system 100 includes a housing 110, and an oil inlet pipe 120 for receiving external cooling oil is provided on the housing 110. The electric drive stator cooling structure 200 is arranged in the housing 110. The electric drive stator cooling structure 200 includes an oil spraying ring 210, an iron core 220 and a stator winding 230. A plurality of oil spraying holes 212 are penetrated on the peripheral side wall of the oil spraying ring 210; one end of the iron core 220 is connected to the oil spraying ring 210, and the iron core 220 A channel is provided through the core 220 along its axial direction, and a plurality of oil guide holes are provided through the end wall of the core 220 along its length direction. The end wall of the core 220 close to the oil pouring ring 210, the outer peripheral wall of the oil pouring ring 210 and the inner wall of the shell 110 form a receiving chamber 140, and the receiving chamber 140 is connected with the oil inlet pipe 120, the oil guide hole and the oil pouring hole 212; the stator winding 230 is arranged in the channel and connected to the inner wall of the core 220, one end of the stator winding 230 extends into the oil pouring ring 210, and the other end of the stator winding 230 extends out of the channel.

[0043] The oil pouring holes 212 are evenly distributed on the peripheral side wall of the oil pouring ring 210. The outer diameter of the iron core 220 is larger than the outer diameter of the oil pouring ring 210, so an annular groove can be formed between the end wall of the iron core 220 close to the oil pouring ring 210 and the outer peripheral wall of the oil pouring ring 210, and after being installed with the housing 110, an annular accommodating cavity 140 that can accommodate cooling oil is formed. The stator winding 230 passes through the channel in the middle of the iron core 220 and is fixedly connected to the inner wall of the channel, and one end of the stator winding 230 extends out of the channel, and the other end extends into the oil pouring ring 210.

[0044] Specifically, after the accommodating cavity 140 is filled with cooling oil, a portion of the cooling oil is sprayed to cool one end of the stator winding 230 through a plurality of oil spray holes 212 on the oil spray ring 210, and another portion of the cooling oil is sprayed to cool the other end of the stator winding 230 through a plurality of oil guide holes on the iron core 220, and at the same time, the heat generated by the iron core 220 when the motor is working can be taken away, thereby cooling the iron core 220.

[0045] The electric drive stator cooling structure 200 in this embodiment only requires the cooperation of the iron core 220 and an oil sprinkler ring 210 to cool both ends of the iron core 220 and the stator winding 230. In summary, the electric drive stator cooling structure 200 in this embodiment integrates the distribution and circulation functions of the cooling oil into the structure of the iron core 220, simplifies the design of the cooling structure, and reduces the number of cooling components, thereby making the electric drive stator cooling structure 200 simple and light, which is conducive to production and manufacturing as well as subsequent maintenance.

[0046] Reference Figure 1 and Figure 2In some embodiments, the iron core 220 includes a first sub-core group 221, a second sub-core 223 and a third sub-core 225 which are coaxially connected in sequence. The first sub-core group 221 is arranged close to the oil pouring ring 210. The first sub-core group 221 includes multiple first sub-cores 220. A plurality of first oil holes 222 are penetrated through the end wall of the first sub-core 220 along its length direction; a plurality of second oil holes 224 are penetrated through the end wall of the second sub-core 223 along its length direction; a plurality of third oil holes 226 are penetrated through the end wall of the third sub-core 225 along its length direction; the third oil holes 226, the second oil holes 224 and the first oil holes 222 located on the same flow path of the cooling oil are connected to form an oil guide hole.

[0047] Among them, the first sub-core 220, the second sub-core 223 and the third sub-core 225 are all stacked by a single punching sheet, and the stacking height is determined according to the design requirements. The axial length of the first sub-core group 221 in this embodiment is greater than the sum of the lengths of the second sub-core 223 and the third sub-core 225, that is, the stacking height of the second sub-core 223 and the third sub-core 225 in this embodiment is relatively low and the thickness is also relatively thin, and most of the length of the entire core 220 is composed of the first sub-core group 221. Such a design can make the cooling oil take away most of the heat generated by the core 220 when the motor is working when passing through a number of evenly distributed first oil holes 222, thereby helping to ensure the cooling efficiency and effect of the cooling oil on the core 220; in addition, the larger stacking height and longer length of the first sub-core group 221 enable it to increase a larger area and magnetic circuit for carrying and conducting the magnetic field, thereby helping to improve the magnetic flux density and electromagnetic conversion efficiency of the motor.

[0048] Specifically, during the cooling process, the cooling oil flows sequentially through the first sub-core 220, the second sub-core 223 and the third sub-core 225, and by setting different types of oil holes, the cooling oil can form an efficient flow path inside the core 220, thereby improving the cooling efficiency.

[0049] In this embodiment, by providing different types of oil holes, the cooling oil can form an efficient flow path inside the iron core 220, thereby improving the cooling efficiency.

[0050] Reference Figure 2 and Figure 5 In some embodiments, the first oil hole 222 is disposed close to the outer diameter of the first sub-core 220 .

[0051] Specifically, a plurality of first oil holes 222 are evenly distributed on the end wall, i.e., the side wall, of the first sub-core 220 along the circumference of the first sub-core 220, and the shape of the first oil hole 222 is similar to a rectangle. One side wall of the first oil hole 222 is arranged close to the peripheral side wall of the first sub-core 220, i.e., the first oil hole 222 is arranged at the outer diameter position of the first sub-core 220, which can avoid interference with the magnetic circuit of the core 220 and at the same time maintain a good cooling effect.

[0052] In this embodiment, the first oil hole 222 is disposed close to the outer diameter of the first sub-core 220 to avoid interference with the magnetic circuit of the core 220 , while maintaining a good cooling effect.

[0053] Reference Figure 4 and Figure 6 In some embodiments, the extension direction of the second oil hole 224 is arranged along the radial direction of the second sub-core 223 , and the cross-sectional area of ​​the second oil hole 224 is greater than the cross-sectional area of ​​the first oil hole 222 .

[0054] Among them, the stacking height of the second sub-core 223 is relatively low, and the proportion of the length of the entire core 220 is very low, and the impact on the electromagnetic performance of the entire core 220 can be ignored. After the second sub-core 223 and the first sub-core 220 are matched together, the cooling oil enters the second oil hole 224 from the first oil hole 222, and the radial design of the second oil hole 224 can realize the cooling oil from the outer circle direction of the core 220 to the vicinity of the tooth slot 227 of the core 220, so that the cooling of the core 220 near the tooth slot 227 can be realized at the same time.

[0055] Specifically, since the axial length of the second sub-core 223 is much smaller than the axial length of the first sub-core group 221, in order to ensure that the second oil hole 224 cooperates with the first oil hole 222 to uniformly dissipate heat from the core 220, the cross-sectional area of ​​the second oil hole 224 is set to be larger than the cross-sectional area of ​​the first oil hole 222. As a result, after the cooling oil flows from the first oil hole 222 into the radially arranged second oil hole 224, the outer portion of the core 220 and the tooth slot 227 can be cooled simultaneously, thereby avoiding local overheating of the core 220 and helping to improve the overall cooling efficiency of the core 220.

[0056] In this embodiment, the extension direction of the second oil hole 224 is set to be along the radial direction of the second sub-core 223, and the cross-sectional area of ​​the second oil hole 224 is made larger than the cross-sectional area of ​​the first oil hole 222, which helps to increase the flow rate of the cooling oil and improve the cooling effect. It can also cooperate with the first oil hole 222 to achieve uniform heat dissipation of the core 220, thereby improving the overall cooling efficiency of the core 220.

[0057] Reference Figure 4 and Figure 6In some embodiments, one end of the second oil hole 224 away from the first oil hole 222 is located between two adjacent tooth grooves 227 of the second sub-core 223 .

[0058] Specifically, in order to allow the cooling oil to fully cool the iron core 220 , one end of the second oil hole 224 away from the first oil hole 222 is disposed between two adjacent tooth grooves 227 .

[0059] Reference Figure 4 and Figure 6 In some embodiments, the cross-sectional width of the second oil hole 224 gradually decreases from an end close to the first oil hole 222 to an end far away from the first oil hole 222 .

[0060] Specifically, when the cross-sectional width of the second oil hole 224 gradually decreases from the end close to the first oil hole 222 to the end far away from the first oil hole 222, the flow rate of the cooling oil when passing through the second oil hole 224 will increase, thereby avoiding the problem of local overheating of the cooling oil near the tooth groove 227 due to too low a flow rate; in addition, the pressure loss of the cooling oil when passing through the second oil hole 224 can be reduced, avoiding excessive pressure drop when the cooling oil passes through the second oil hole 224, thereby helping to maintain the stability and uniformity of the cooling oil flow.

[0061] In this embodiment, the cross-sectional width of the second oil hole 224 is set to gradually decrease from the end close to the first oil hole 222 to the end away from the first oil hole 222. This can increase the flow rate of the cooling oil when passing through the second oil hole 224, so that the cooling oil can flow more evenly through the entire tooth groove 227 area; it can also concentrate the flow of the cooling oil, thereby enhancing the cooling effect near the tooth groove 227 of the iron core 220; it can also reduce the pressure loss of the cooling oil flow and maintain the stability of the flow; and it can also improve the uniformity and overall cooling effect of the cooling oil by controlling the flow rate of the cooling oil.

[0062] Reference Figure 3 , Figure 6 and Figure 7 In some embodiments, the cross-sectional area of ​​the third oil hole 226 is smaller than the cross-sectional area of ​​the first oil hole 222 .

[0063] Specifically, the cross-sectional area of ​​the third oil hole 226 is set to be smaller than the cross-sectional area of ​​the first oil hole 222, that is, the cross-sectional area of ​​the third oil hole 226 is also smaller than the cross-sectional area of ​​the second oil hole 224, so that when the cooling oil flowing out of the second oil hole 224 flows into the third oil hole 226, the flow rate increases, thereby helping to improve the cooling of the end of the stator winding 230 away from the oil sprinkler ring 210 by the cooling oil; and the increase in flow rate can also take away more heat and improve the cooling effect; in addition, the cross-sectional area of ​​the third oil hole 226 is smaller, and the cooling oil of the same flow rate can also flow in a smaller cross-sectional space, thereby causing the pressure in the third oil hole 226 to increase, and this pressure increase helps to push the cooling oil to a farther area; in addition, by setting a smaller third oil hole 226, the cooling oil can be effectively prevented from flowing back to the first oil hole 222, thereby helping to ensure that the flow direction of the cooling oil from the first oil hole 222 to the third oil hole 226 is consistent, thereby optimizing the overall efficiency of the cooling system.

[0064] In this embodiment, the cross-sectional area of ​​the third oil hole 226 is set to be smaller than the cross-sectional area of ​​the first oil hole 222, so that the flow rate of the cooling oil in the third oil hole 226 can be increased, thereby helping to improve the cooling effect; it can also increase the pressure, thereby helping to effectively spray the cooling oil to an area away from the oil spray ring 210; it can also enhance the spraying and distribution of the cooling oil to ensure that all parts of the motor are adequately cooled; it can also improve the flow stability of the cooling oil and reduce the reflux of the cooling oil, thereby improving the overall cooling efficiency.

[0065] Reference Figure 7 and Figure 8 In some embodiments, the third oil hole 226 is connected to an end of the second oil hole 224 away from the first oil hole 222 .

[0066] Specifically, the third oil hole 226 is circular in shape, and the third oil hole 226 is set to be connected to the end of the second oil hole 224 away from the first oil hole 222, so as to create a continuous oil flow path, so that the cooling oil can smoothly flow from the first oil hole 222 through the second oil hole 224 and then into the third oil hole 226. This design can also reduce the resistance of the cooling oil at the turning point or interface, thereby helping to maintain the continuity and stability of the cooling oil; in addition, this design makes the inlet end of the second oil hole 224 and the outlet end of the second oil hole 224 produce a certain height difference in the radial direction, so that the cooling oil can naturally flow to the third oil hole 226 without additional power, thereby enhancing the cooling effect; in addition, by directly connecting the third oil hole 226 with the far end of the second oil hole 224, the interface and turning between the oil holes can be reduced, the possibility of cooling oil leakage can be reduced, and the overall structure can be simplified, the complexity of manufacturing and maintenance can be reduced, and subsequent inspection and maintenance can be facilitated.

[0067] In this embodiment, the third oil hole 226 is arranged to be connected to the end of the second oil hole 224 away from the first oil hole 222, and the radial height difference is utilized to optimize the flow path of the cooling oil, improve the cooling efficiency and uniformity, and at the same time, simplify the design of the cooling structure and enhance the reliability of the cooling system, and is conducive to reducing manufacturing costs and reducing the complexity of maintenance, facilitating subsequent maintenance.

[0068] The electric drive stator cooling structure 200 in the present application integrates the distribution and circulation functions of the cooling oil into the structure of the iron core 220, that is, through the cooperation of the first oil hole 222, the second oil hole 224 and the third oil hole 226 on the iron core 220, and a single oil spray ring 210, both ends of the iron core 220 and the stator winding 230 can be cooled, which simplifies the design of the cooling structure and reduces the number of cooling components, thereby making the electric drive stator cooling structure 200 simple and lightweight, which is conducive to production and subsequent maintenance.

[0069] In the second aspect, an embodiment of the present application provides a motor cooling system 100, including any one of the electric drive stator cooling structures 200 provided in the first aspect above, the motor cooling system 100 also includes a shell 110 and a heat exchanger 130, the shell 110 is provided with an oil inlet pipe 120 for receiving external cooling oil, and the electric drive stator cooling structure 200 is arranged in the shell 110; the heat exchanger 130, the oil outlet of the heat exchanger 130 is connected to the oil inlet pipe 120.

[0070] Specifically, the electric drive stator cooling structure 200 is disposed in the housing 110 and is detachably connected to the inner wall of the housing 110 by bolts, nuts or other connection methods. The main function of the heat exchanger 130 is to adjust the temperature of the cooling oil. The heat exchanger 130 may contain a heat exchange medium, such as water or air, which changes the temperature of the cooling oil by contact with the cooling oil. The oil outlet of the heat exchanger 130 is connected to the oil inlet pipe 120, so that the cooling oil can enter the cooling system inside the housing 110 after being processed by the heat exchanger 130, so as to better cool the motor as a whole.

[0071] The motor cooling system 100 in this embodiment, after being provided with the electric drive stator cooling structure 200 of the first aspect mentioned above, also has a corresponding method of integrating the distribution and circulation functions of the cooling oil into the structure of the iron core 220, thereby simplifying the design of the cooling structure and reducing the number of cooling components, thereby making the electric drive stator cooling structure 200 simple and light, which is beneficial to the technical effect of production and manufacturing as well as subsequent maintenance.

[0072] On the third aspect, an embodiment of the present application provides a motor, including the motor cooling system 100 provided in the second aspect, and correspondingly has a method of integrating the distribution and circulation functions of the cooling oil into the structure of the iron core 220, thereby simplifying the design of the cooling structure and reducing the number of cooling components, thereby making the electric drive stator cooling structure 200 simple and light, which is beneficial to the technical effect of production and manufacturing as well as subsequent maintenance.

[0073] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0074] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An electric drive stator cooling structure, suitable for a motor cooling system, the motor cooling system comprising a housing, the housing being provided with an oil inlet pipe for receiving external cooling oil, the electric drive stator cooling structure being arranged in the housing, characterized in that: The electric drive stator cooling structure comprises: An oil pouring ring, wherein a plurality of oil pouring holes are provided on the peripheral side wall of the oil pouring ring; An iron core, one end of which is connected to the oil pouring ring, a passage is provided through the iron core along its own axial direction, a plurality of oil guide holes are provided through the end wall of the iron core along its own length direction, the end wall of the iron core close to one end of the oil pouring ring, the outer peripheral wall of the oil pouring ring and the inner wall of the shell form a receiving cavity, and the receiving cavity is connected with the oil inlet pipe, the oil guide hole and the oil pouring hole; The stator winding is arranged in the channel and connected to the inner wall of the iron core. One end of the stator winding extends into the oil pouring ring, and the other end of the stator winding extends out of the channel.

2. The electric drive stator cooling structure according to claim 1, characterized in that: The core includes: A first sub-core group, the first sub-core group is arranged close to the oil pouring ring, the first sub-core group includes a plurality of first sub-cores, and a plurality of first oil holes are penetrated on the end wall of the first sub-core along its length direction; A second sub-core, wherein a plurality of second oil holes are provided on the end wall of the second sub-core along the length direction thereof; A third sub-core, wherein a plurality of third oil holes are provided on the end wall of the third sub-core along its length direction; The third oil hole, the second oil hole and the first oil hole located on the same flow path of the cooling oil are connected to each other and constitute the oil guide hole.

3. The electric drive stator cooling structure according to claim 2, characterized in that: The first oil hole is arranged close to the outer diameter of the first sub-core.

4. The electric drive stator cooling structure according to claim 3, characterized in that: The extension direction of the second oil hole is arranged along the radial direction of the second sub-core, and the cross-sectional area of ​​the second oil hole is larger than the cross-sectional area of ​​the first oil hole.

5. The electric drive stator cooling structure according to claim 4, characterized in that: One end of the second oil hole away from the first oil hole is located between two adjacent tooth slots of the second sub-core.

6. The electric drive stator cooling structure according to claim 5, characterized in that: The cross-sectional width of the second oil hole gradually decreases from an end close to the first oil hole to an end far away from the first oil hole.

7. The electric drive stator cooling structure according to claim 5, characterized in that: A cross-sectional area of ​​the third oil hole is smaller than a cross-sectional area of ​​the first oil hole.

8. The electric drive stator cooling structure according to claim 7, characterized in that: The third oil hole is communicated with an end of the second oil hole away from the first oil hole.

9. A motor cooling system, characterized in that: The electric drive stator cooling structure according to any one of claims 1 to 8 is characterized in that the motor cooling system further comprises: A housing, wherein the housing is provided with an oil inlet pipe for receiving external cooling oil, and the electric drive stator cooling structure is arranged in the housing; A heat exchanger, wherein the oil outlet of the heat exchanger is connected to the oil inlet pipe.

10. A motor, characterized in that: The motor cooling system comprises the motor cooling system as claimed in claim 9.

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