Motor heat dissipation structure, heat pipe and motor

Abstract

The utility model relates to a motor heat dissipation structure, which comprises a motor and a heat pipe, the motor comprises a casing, a first end cover and a stator core, the stator core is arranged in the casing, the first end cover is arranged at one end of the casing along the axial direction, the inner surface of the casing is provided with a first pipe groove, and the inner surface of the first end cover is provided with a second pipe groove; the heat pipe comprises an evaporation section and a cooling section which are connected with each other, the evaporation section is arranged in the pipe groove, and the cooling section is arranged in the second pipe groove. The utility model further provides a heat pipe and a motor. The heat pipe and the motor can solve the problems that a heat pipe arrangement scheme in a traditional motor is not high in utilization rate of heat dissipation capacity of the heat pipe, and reliability of the motor is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor heat dissipation structure, a heat pipe and a motor. Background Art

[0002] As motors become increasingly smaller, more power-dense, and more compact in structure and layout, improving the heat dissipation capacity of motors has become an important issue in improving motor performance.

[0003] Heat pipes have good thermal conductivity and can be used in motors to improve the heat dissipation capacity of the motors. However, the heat pipe arrangement scheme currently used in motors does not fully utilize the heat dissipation capacity of the heat pipes and reduces the reliability of the motors. Summary of the invention

[0004] Based on this, it is necessary to provide a motor heat dissipation structure, a heat pipe and a motor to address the problem that the heat pipe arrangement scheme in the traditional motor has low utilization rate of the heat pipe heat dissipation capacity and reduces the reliability of the motor.

[0005] According to one aspect of the present application, a motor heat dissipation structure is provided, comprising: a motor, the motor comprising a casing, a first end cover and a stator core, the stator core being arranged in the casing, and the first end cover being arranged at one end of the casing along the axial direction; a plurality of first tube grooves being arranged on the inner surface of the casing, and a plurality of second tube grooves being arranged on the inner surface of the first end cover; a heat pipe, the heat pipe comprising an evaporation section and a cooling section connected to each other, the evaporation section being arranged in the first tube groove, and the cooling section being arranged in the second tube groove.

[0006] In some embodiments, the first tube groove has a head end and a tail end connected to the second tube groove, and the head end and the tail end of the first tube groove are spaced apart in the axial direction.

[0007] In some embodiments, the first tube groove extends linearly along the axial direction; or the first tube groove extends spirally along the axial direction.

[0008] In some embodiments, the second tube groove extends in a radial direction; or an extending direction of the second tube groove intersects with the radial direction.

[0009] In some embodiments, the cross-sectional shape of the evaporation section is a triangle, a quadrilateral, a pentagon, a hexagon, a circle, an ellipse or a combination of at least two thereof; and / or the radial dimension of the evaporation section is smaller than its circumferential dimension.

[0010] In some embodiments, one end of the heat pipe away from the first end cover extends out of the casing.

[0011] In some embodiments, the motor also includes a second end cover, which is arranged at the other end of the casing along the axial direction; the second end cover covers the end of the heat pipe extending out of the casing; and / or the casing is provided with a through hole, which passes through the side wall of the casing; the end of the heat pipe away from the first end cover extends out of the casing through the through hole, and the end of the heat pipe extending out of the casing is bent and extends toward the first end cover.

[0012] In some embodiments, the housing and the first end cover are integrally formed.

[0013] In some embodiments, the first tube groove is configured to be recessed relative to the inner surface of the casing, and the second tube groove is configured to be recessed relative to the inner surface of the first end cover; the shape of the evaporation section is adapted to the shape of the first tube groove, and the shape of the cooling section is adapted to the shape of the second tube groove.

[0014] The present application also provides a heat pipe, which is applied to a motor, wherein the motor comprises a housing, a first end cover and a stator core, wherein the stator core is arranged in the housing, and the first end cover is arranged at one end of the housing along the axial direction; a first pipe groove is arranged on the inner surface of the housing, and a second pipe groove is arranged on the inner surface of the first end cover;

[0015] The heat pipe comprises an evaporation section and a cooling section connected to each other, the evaporation section is arranged in the first tube groove, and the cooling section is arranged in the second tube groove.

[0016] The present application also proposes a motor, which includes the above-mentioned motor heat dissipation structure. The motor heat dissipation structure, heat pipe and motor provided by the present application are provided by setting a first tube groove on the inner surface of the casing, setting a second tube groove on the inner surface of the first end cover located at one axial end of the casing, setting the evaporation section of the heat pipe in the first tube groove, and setting the cooling section of the heat pipe in the second tube groove, so that the evaporation section of the heat pipe is close to the stator core in the casing, and the cooling section is close to the first end cover, while not causing damage to the original structure of the motor. In this way, the application of the heat pipe on the motor can quickly transfer the heat of the stator core with a higher temperature to the casing and the first end cover with a lower temperature, and further transfer it to the outside of the motor, for example, to the flat plate structure of the external device connected to the motor, thereby improving the utilization rate of the heat dissipation capacity of the heat pipe and ensuring the reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A top view of a partial structure of a motor in an embodiment of the present application is shown.

[0018] Figure 2 A schematic cross-sectional structure diagram of a partial structure of a motor in an embodiment of the present application is shown.

[0019] Figure 3 A schematic diagram of the three-dimensional structure of a casing in an embodiment of the present application is shown.

[0020] Figure 4 A top view of a housing in an embodiment of the present application is shown.

[0021] Figure 5 A schematic diagram of the three-dimensional structure of a heat pipe in an embodiment of the present application is shown.

[0022] Figure 6 A schematic diagram of assembling a heat pipe and a housing in an embodiment of the present application is shown.

[0023] Figure 7 A three-dimensional diagram showing a partial structure of a motor in an embodiment of the present application is shown.

[0024] Figure 8 Shows Figure 7 Side view of the motor.

[0025] Fig. 9 Shows Figure 7 Bottom view of the motor.

[0026] Fig.10 Shows Figure 7 Side view of the middle motor with the second end cover assembled.

[0027] Fig.11 A three-dimensional diagram showing a partial structure of a motor in another embodiment of the present application.

[0028] Description of Figure Numbers:

[0029] 1. housing; 11. first pipe slot;

[0030] 2. first end cover; 21. stopper; 22. second pipe groove;

[0031] 3. Second end cover;

[0032] 4. Stator core;

[0033] 5. Skeleton;

[0034] 6. Printed circuit board;

[0035] 7. heat pipe; 71. evaporation section; 72. cooling section;

[0036] 8. Potting glue. DETAILED DESCRIPTION

[0037] 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.

[0038] In the description of the present application, it should be understood that if 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", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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 the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the 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. The first feature being "below", "below" and "below" the 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.

[0042] It should be noted that if 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. If 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. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0043] With the improvement of design capabilities and manufacturing technology, motors are becoming increasingly smaller, with higher power density and more compact structure layout, which will lead to higher thermal loads during motor operation. Excessive thermal loads will have a negative impact on the efficiency and reliability of the motor. Therefore, improving the heat dissipation capacity of the motor has become an important issue in improving motor performance.

[0044] Traditional motors often use air cooling, liquid cooling, natural cooling and other methods to achieve heat dissipation. In order to improve the heat dissipation performance of motors, heat pipe technology has emerged in related technologies for heat dissipation. Heat pipes use the principle of heat conduction and the rapid heat transfer properties of phase change media to quickly transfer the heat of the heating object to the outside of the heat source through heat pipes. Its thermal conductivity exceeds that of most known metals.

[0045] However, the inventors of the present application have found that the heat pipe solutions currently used in motors do not have a high utilization rate of the heat dissipation capacity of the heat pipes and will reduce the reliability of the motors.

[0046] Specifically, when drilling a hole on the shaft and inserting the heat pipe into the hole on the shaft, the strength will be reduced, the required radial force at the shaft extension end will be reduced, and the tool will be easily broken, making processing difficult. When the heat pipe is arranged in the stator slot, the slot fill rate will be reduced, thereby reducing the efficiency of the motor, and there will be insulation problems, affecting reliability. When the heat pipe is arranged in the slot on the outer diameter of the stator core, it will affect the electromagnetic performance. When the heat pipe is glued and fixed between the heat dissipation ribs outside the casing, it will affect the appearance of the motor, and it will be difficult to glue, and there is a risk of glue leakage.

[0047] In order to solve the above problems, the present application provides a motor heat dissipation structure, by setting a plurality of first tube grooves on the inner surface of the casing, setting a plurality of second tube grooves on the inner surface of the first end cover located at one axial end of the casing, installing the evaporation section of the heat pipe in the first tube groove, and setting the cooling section of the heat pipe in the second tube groove. In this way, the evaporation section of the heat pipe is close to the stator core, and the cooling section is close to the first end cover, which can quickly transfer the heat inside the motor to the outside of the motor, thereby improving the utilization rate of the heat dissipation capacity of the heat pipe without damaging the reliability of the motor. Through simulation and experimental data, it is concluded that this solution can reduce the temperature rise by 3K-5K, improve the heat dissipation performance of the motor, and thus reduce the winding temperature, improve the efficiency and economy of the motor, etc.

[0048] Figure 1 A top view of a partial structure of a motor in an embodiment of the present application is shown. Figure 2 A schematic cross-sectional structure diagram of a partial structure of a motor in an embodiment of the present application is shown.

[0049] See also Figure 1 and Figure 2 , a motor heat dissipation structure provided in one embodiment of the present application includes a motor and a heat pipe. The motor includes a casing 1, a stator and a rotor arranged in the casing 1, and the stator is sleeved on the outer periphery of the rotor. Among them, the stator can be a stationary fixed part of the motor, which can generate a rotating magnetic field after the current is passed through, and the rotor can be a rotating part of the motor, which can rotate under the action of the rotating magnetic field generated by the stator. Specifically, the stator includes a skeleton 5, a stator core 4 and a winding, the winding is wound on the stator core 4, and the skeleton 5 fixedly supports the stator core 4 and the winding, wherein the stator core 4 is interference fit with the casing 1.

[0050] Furthermore, the motor further includes a first end cover 2 provided at one end of the housing 1 along the axial direction, and the first end cover 2 and the housing 1 may be integrally formed or separately formed. The axial direction refers to the direction of the central axis of the stator core 4. In addition, the motor further includes a bearing, an encoder, a printed circuit board 6 (PCB), etc., and the structure and connection relationship thereof may refer to the structure and connection relationship of the bearing, encoder, and printed circuit board 6 in the related art, and will not be described in detail here.

[0051] In an exemplary embodiment, the first end cover 2 and the housing 1 are integrally formed, so that the overall structure of the first end cover 2 and the housing 1 is simple and convenient to form.

[0052] Furthermore, the outer surface of the first end cover 2 forms a stopper 21, which is used to connect with the mounting surface of the external device. For example, the outer surface of the first end cover 2 is convex to form a cylindrical boss, and the mounting surface of the external device is concave to form a recessed portion whose shape and size are compatible with the boss. It can be understood that the outer side of the first end cover 2 is connected to the external device and is the cold end of the motor. The winding inside the housing 1 is the main hot end of the motor.

[0053] Based on this, when the motor is connected to an external device, there is a larger contact area between the stop 21 and the mounting surface of the external device, so that the first end cover 2 can fully transfer the heat transferred by the cooling section 72 of the heat pipe 7 to the outside of the motor through the mounting surface of the external device.

[0054] Figure 3 A schematic diagram of the three-dimensional structure of a casing in an embodiment of the present application is shown. Figure 4 A top view of a housing in an embodiment of the present application is shown. Figure 5 A schematic diagram of the three-dimensional structure of a heat pipe in an embodiment of the present application is shown. Figure 6 A schematic diagram of assembling a heat pipe and a housing in an embodiment of the present application is shown.

[0055] See also Figure 3 and Figure 4 Furthermore, the inner surface of the housing 1 is provided with a first tube groove 11. Specifically, the first tube groove 11 can be formed by forming a depression on the inner surface of the housing 1, or a plurality of ribs can be formed on the inner surface of the housing 1, and the first tube groove 11 is formed between two adjacent ribs.

[0056] The inner surface of the first end cover 2 is provided with a second tube groove 22. Similarly, the second tube groove 22 can also be formed by forming a depression on the inner surface of the first end cover 2, or by forming a plurality of ribs on the inner surface of the first end cover 2, and forming the second tube groove 22 between two adjacent ribs.

[0057] Combination Figure 3-Figure 6 The motor heat dissipation structure provided in the present application includes one or more heat pipes 7. When the motor heat dissipation structure includes multiple heat pipes 7, the multiple heat pipes 7 can be arranged at intervals along the circumferential direction. For example, eight heat pipes 7 are arranged at intervals along the circumferential direction to improve the uniformity of heat dissipation. The heat pipe 7 includes an evaporation section 71 and a cooling section 72 connected to each other. The evaporation section 71 and the cooling section 72 can be integrally formed. Among them, the evaporation section 71 is arranged in the first tube groove 11, and the cooling section 72 is located in the second tube groove 22. It can be understood that the circumferential direction refers to the circumferential direction surrounding the axial direction.

[0058] Combination Figure 1-Figure 3Based on this, the evaporation section 71 of the heat pipe 7 is close to the stator core 4 in the housing 1, and the cooling section 72 is close to the first end cover 2, while not damaging the original structure of the motor. In this way, the application of the heat pipe 7 on the motor can quickly transfer the heat of the stator core 4 with a higher temperature to the housing 1 and the first end cover 2 with a lower temperature, and further transfer it to the outside of the motor, thereby ensuring the reliability of the motor while improving the utilization rate of the heat pipe's heat dissipation capacity.

[0059] In addition, since the heat pipe 7 extends to the stop 21 close to the first end cover 2 and is closer to structures such as the flat plate structure of the external device, the heat dissipation area is increased, heat can be better exchanged, and the heat exchange power can be maximized.

[0060] Optionally, when the motor heat dissipation structure includes a plurality of heat pipes 7 , any two adjacent heat pipes 7 may be arranged at even intervals or at uneven intervals.

[0061] See also Figure 4 For example, when any two adjacent heat pipes 7 cannot be evenly spaced apart due to the limitation of the casing 1 or other components in the casing 1, the two adjacent heat pipes 7 can be set as a heat pipe group, and any two adjacent heat pipe groups can be evenly spaced apart. In this way, the uniformity of arrangement of the heat pipes 7 can be improved without affecting the assembly of the original components in the casing 1, thereby improving the uniformity of heat dissipation of the motor.

[0062] Optionally, the size of the first tube groove 11 is larger than the size of the heat pipe 7. Taking the cross-sectional shape of the first tube groove 11 as a rectangle as an example, the width of the first tube groove 11 is larger than the width of the heat pipe 7, and the thickness of the first tube groove 11 is larger than the thickness of the heat pipe 7. For example, the width of the first tube groove 11 is 0.2 mm to 0.3 mm larger than the width of the heat pipe 7, and the thickness of the first tube groove 11 is 0.2 mm to 0.3 mm larger than the thickness of the heat pipe 7. In this way, it is convenient to put the evaporation section 71 of the heat pipe 7 into the first tube groove 11.

[0063] See also Figure 2 Furthermore, after the evaporation section 71 of the heat pipe 7 is placed in the first pipe groove 11, it can be fixed by applying thermal conductive silicone or by using mechanical limiter. After fixation, glue is poured so that the heat pipe 7 is immersed in the glue as a whole. The heat conductivity between the heat pipe 7 and the housing 1 and the stator core 4 is increased by the potting glue 8, thereby improving the heat exchange efficiency of the heat pipe 7 and making full use of the rapid heat transfer performance of the phase change medium of the heat pipe 7. At the same time, the potting glue 8 can also improve the stiffness of the motor and improve the insulation capacity.

[0064] Combination Figure 2 and Figure 3Optionally, the first tube slot 11 has a head end and a tail end connected to the second tube slot 22, and the head end and the tail end of the first tube slot 11 are spaced apart in the axial direction. In this way, the evaporation section 71 of the heat pipe 7 can exchange heat with different parts of the stator core 4 along the axial direction, thereby improving the heat dissipation performance.

[0065] See also Figure 3 Optionally, the first tube groove 11 extends linearly along the axial direction. For example, the first tube groove 11 extends from one axial end of the housing 1 to the other axial end. In this way, the first tube groove 11 has a simple structure, and the installation of the heat pipe 7 is convenient and quick.

[0066] Optionally, the first tube slot 11 extends in a spiral shape along the axial direction. In this way, the extension path of the first tube slot 11 can be extended, thereby increasing the heat exchange area between the heat pipe 7 and the stator core 4, thereby improving the heat dissipation efficiency.

[0067] See also Figure 3 Optionally, the second tube slot 22 extends in the radial direction. It is understandable that the radial direction refers to the direction perpendicular to the axial direction. Based on this, the second tube slot 22 can be combined with the first tube slot 11 extending axially to form a tube slot 11 with a simple structure and a long extension path, so that there is a large heat exchange area between the heat pipe 7 and the stator core 4, while ensuring that the molding process of the housing 1 is relatively simple.

[0068] Optionally, the extension direction of the second tube slot 22 intersects with the radial direction. For example, the angle between the extension direction of the second tube slot 22 and the radial direction is 5°, 10°, 15°, 20°, 30°, 40° or 50°. In this way, the extension path of the second tube slot 22 can be extended within a limited space, thereby increasing the heat exchange area between the heat pipe 7 and the cold end of the motor and improving the heat transfer efficiency.

[0069] Further, when the extension direction of the second tube slot 22 intersects with the radial direction, the extension path of the second tube slot 22 may be a straight line, a broken line, or a curved line, so as to further extend the extension path of the second tube slot 22 .

[0070] See also Figure 5 In an exemplary embodiment, the heat pipe 7 is constructed in an L shape, that is, the evaporation section 71 extends in the axial direction and the cooling section 72 extends in the radial direction. The structure is simple and the heat exchange area is large.

[0071] Optionally, different molds can be selected according to the specific structure of the housing 1 to change the cross-sectional shape of the heat pipe 7, and the heat pipe 7 can be made into a square or special-shaped structure, so that the heat pipe 7 has a larger heat exchange area with the hot end and the cold end of the motor. For example, the cross-sectional shape of the evaporation section 71 can be a triangle, a quadrilateral, a pentagon, a hexagon, a circle, an ellipse, or a combination of at least two of them. Among them, the square heat pipe 7 can be inserted into the straight slot after the stator enters the housing 1, and the special-shaped heat pipe 7 can be placed in the special-shaped slot before the stator assembly enters the housing 1.

[0072] Continue reading Figure 5 Optionally, the radial dimension of the evaporation section 71 is smaller than its circumferential dimension. In other words, the heat pipe 7 is a flat structure. In this way, it is possible to avoid reducing the wall thickness of the housing 1 too much and affecting the strength of the housing 1.

[0073] In some embodiments, a groove may also be provided on the stator core 4, and the groove is combined with the groove on the inner surface of the housing 1 to form a pipe slot 11. In this way, the heat exchange area between the heat pipe 7 and the stator core 4 can be further increased.

[0074] Figure 7 A three-dimensional diagram showing a partial structure of a motor in an embodiment of the present application is shown. Figure 8 Shows Figure 7 Side view of the motor. Fig. 9 Shows Figure 7 Bottom view of the motor. Fig.10 Shows Figure 7 Side view of the middle motor with the second end cover assembled.

[0075] Combination Figure 1 , Figure 7-Figure 9 In some embodiments, the end of the heat pipe 7 away from the first end cover 2 extends out of the housing 1, so that a portion of the heat pipe 7 extends out of the stator core 4. Based on this, the temperature of the heat pipe 7 close to the stator core 4 is higher, while the temperature of the heat pipe 7 away from the stator core 4 is lower, thereby achieving better heat exchange.

[0076] Combination Figure 2 , Figure 8 and Fig.10 Optionally, the motor further includes a second end cover 3, which is disposed at the other end of the housing 1 along the axial direction. In other words, the first end cover 2 and the second end cover 3 are respectively located at opposite ends of the housing 1 along the axial direction. Therefore, the first end cover 2 and the second end cover 3 can also be referred to as a front end cover and a rear end cover.

[0077] The second end cover 3 has a cavity. When the second end cover 3 is assembled with the housing 1, the cavity is a closed cavity. The second end cover 3 covers the end of the heat pipe 7 extending outside the housing 1, so that the end of the heat pipe 7 extending outside the housing 1 is accommodated in the closed cavity. Specifically, a hole can be opened on the housing 1 or the second end cover 3, so that the heat pipe 7 extends into the cavity of the second end cover 3 through the hole. In this way, a cooling section is added, and the heat exchange efficiency is improved.

[0078] Furthermore, the portion of the heat pipe 7 extending into the cavity of the second end cover 3 can be designed to be straight, with a simple structure and easy to shape; or, the portion of the heat pipe 7 extending into the cavity of the second end cover 3 can also be designed to be curved to extend the length of the cooling section and further improve the heat exchange efficiency.

[0079] Fig.11 A three-dimensional diagram showing a partial structure of a motor in another embodiment of the present application.

[0080] Combination Figure 2 and Fig.11 Optionally, the housing 1 is provided with a through hole penetrating its side wall, and the end of the heat pipe 7 away from the first end cover 2 extends out of the housing 1 through the through hole, and the end of the heat pipe 7 extending out of the housing 1 is bent and extends toward the first end cover 2. Based on this, a cooling section is added, and the cooling section can exchange heat with the air side outside the motor, thereby improving the heat exchange efficiency. In addition, since the end of the heat pipe 7 extending out of the housing 1 is bent and extends toward the first end cover 2, the extension length of the heat pipe 7 is extended without occupying additional axial space, thereby avoiding extending the overall length of the motor while improving the heat exchange efficiency, which is beneficial to the miniaturization design of the motor and improving the heat dissipation performance.

[0081] Optionally, the housing 1 is provided with a through hole and a receiving groove, wherein the through hole penetrates the side wall of the housing 1, and the receiving groove is recessed relative to the outer surface of the housing 1. The heat pipe 7 extends out of the housing 1 through the through hole, and one end of the heat pipe 7 extending out of the housing 1 is received in the receiving groove. Based on this, a cooling section is added, and the overall length of the motor is avoided from being extended, while the space occupied in the thickness direction of the side wall of the housing 1 is also reduced.

[0082] Optionally, the cross-sectional shape of the through hole is the same as that of the heat pipe 7 , thereby reducing the gap between the heat pipe 7 and the hole wall of the through hole, thereby preventing foreign matter from entering the housing 1 through the through hole.

[0083] Furthermore, when the tube extends out of the casing 1 , a rubber sealing element may be made at the extending position to protect the components in the casing 1 .

[0084] Combination Figure 2 and Figure 3Optionally, the first tube slot 11 is configured to be recessed relative to the inner surface of the casing 1, and the second tube slot 22 is configured to be recessed relative to the inner surface of the first end cover 2. When the casing 1 and the first end cover 2 are formed integrally, the first tube slot 11 and the second tube slot 22 can be formed synchronously. The shape of the evaporation section 71 is adapted to the shape of the first tube slot 11, and the shape of the cooling section 72 is adapted to the shape of the second tube slot 22. In this way, the space in the thickness direction of the casing 1 is fully utilized to accommodate the heat pipe 7, without occupying the accommodation space of the stator core 4.

[0085] Based on the same invention purpose, the present application also provides a heat pipe, the structure of which refers to the structure of the heat pipe in the above embodiment and will not be described in detail here.

[0086] Based on the same invention purpose, the present application also provides a motor, the structure of which refers to the structure of the motor in the above embodiment.

[0087] Exemplarily, the motor includes a casing, a stator, and a rotor. The stator and the rotor are arranged in the casing, and the stator is sleeved on the outer periphery of the rotor. Among them, the stator includes a stator core, the stator core and the casing are interference fit, and the inner surface of the casing is provided with a pipe groove, which is used to accommodate the heat pipe. After the heat pipe is arranged in the pipe groove, the heat pipe can be fixed by potting glue. Based on this, the heat pipe is close to the stator core in the casing, and at the same time will not damage the original structure of the motor, so that the application of the heat pipe on the motor will not have a negative impact on the efficiency and reliability of the motor, and can quickly transfer the heat of the stator core with a higher temperature to the outside of the motor, thereby improving the efficiency and reliability of the motor.

[0088] In another embodiment, the present application also proposes a heat pipe for use in a motor, the motor comprising a casing, a first end cover and a stator core, the stator core being disposed in the casing 1, and the first end cover 2 being disposed at one axial end of the casing; a first tube groove 11 being disposed on the inner surface of the casing, and a second tube groove 22 being disposed on the inner surface of the first end cover 2; the heat pipe 7 comprises an evaporation section 71 and a cooling section 72 connected to each other, the evaporation section 71 being disposed in the first tube groove 22, and the cooling section 72 being disposed in the second tube groove 22.

[0089] In another embodiment, the present application further proposes a motor, which includes the above-mentioned motor heat dissipation structure.

[0090] 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.

[0091] 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. A motor heat dissipation structure, characterized in that: include: A motor, the motor comprising a housing, a first end cover and a stator core, the stator core being arranged in the housing, the first end cover being arranged at one end of the housing along the axial direction; a plurality of first tube grooves being arranged on the inner surface of the housing, and a plurality of second tube grooves being arranged on the inner surface of the first end cover; A heat pipe, comprising an evaporation section and a cooling section connected to each other, wherein the evaporation section is arranged in the first tube groove, and the cooling section is arranged in the second tube groove.

2. The motor heat dissipation structure according to claim 1, characterized in that: The first tube groove has a head end and a tail end connected to the second tube groove, and the head end and the tail end of the first tube groove are spaced apart in the axial direction.

3. The motor heat dissipation structure according to claim 2, characterized in that: The first tube groove extends linearly along the axial direction; or The first tube groove extends in a spiral shape along the axial direction.

4. The motor heat dissipation structure according to claim 1, characterized in that: The second tube groove extends in the radial direction; or An extending direction of the second tube groove intersects with a radial direction.

5. The motor heat dissipation structure according to claim 1, characterized in that: The cross-sectional shape of the evaporation section is a triangle, a quadrilateral, a pentagon, a hexagon, a circle, an ellipse or a combination of at least two thereof; and / or The radial dimension of the evaporation section is smaller than the circumferential dimension thereof.

6. The motor heat dissipation structure according to any one of claims 1 to 5, characterized in that: One end of the heat pipe away from the first end cover extends out of the casing.

7. The motor heat dissipation structure according to claim 6, characterized in that: The motor further comprises a second end cover, which is arranged at the other end of the housing in the axial direction; the second end cover covers the end of the heat pipe extending out of the housing; and / or The casing is provided with a through hole, and the through hole passes through the side wall of the casing; the end of the heat pipe away from the first end cover extends out of the casing through the through hole, and the end of the heat pipe extending out of the casing is bent and extends toward the first end cover.

8. The motor heat dissipation structure according to claim 1, characterized in that: The housing and the first end cover are integrally formed.

9. A heat pipe, applied to a motor, characterized in that: The motor comprises a casing, a first end cover and a stator core, wherein the stator core is arranged in the casing, and the first end cover is arranged at one end of the casing along the axial direction; a first tube groove is arranged on the inner surface of the casing, and a second tube groove is arranged on the inner surface of the first end cover; The heat pipe comprises an evaporation section and a cooling section connected to each other, the evaporation section is arranged in the first tube groove, and the cooling section is arranged in the second tube groove.

10. A motor, characterized in that: The motor comprises the motor heat dissipation structure according to any one of claims 1 to 8.

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