Motor

Abstract

The invention provides a motor, which comprises an inner cylinder, an outer cylinder, a stator assembly and a rotor assembly, and is characterized in that at least part of the outer cylinder is radially nested on the circumferential outer side of the inner cylinder, and a cooling water path is defined; the stator assembly and the rotor assembly are arranged in the inner cylinder; the inner cylinder is provided with a first air passing channel, the outer cylinder is provided with a second air passing channel, and the first air passing channel and the second air passing channel are used for communicating the space in the inner cylinder with the space outside the outer cylinder so as to form a closed inner circulation air channel in the motor. According to the motor provided by the embodiment of the invention, on one hand, heat generated during operation of the motor is transferred to the cooling water path; and on the other hand, heat is taken away through circular flow of airflow in the space in the inner barrel, the first air passing channel, the second air passing channel and the space outside the outer barrel. The double cooling mechanism of the inner cylinder and the outer cylinder can improve the cooling effect of the motor and increase the structural simplicity of the motor at the same time. The closed internal circulation air duct can also reduce the probability that external dust and impurities enter the motor.

Description

Technical Field

[0001] This application relates to the technical field of motors, and in particular, to a motor. Background Art

[0002] During the operation of a motor, the power generated by the motor is converted into heat energy. If the heat cannot be dissipated in time, the temperature will rise, which may lead to damage to the motor.

[0003] In the related art, water cooling is used to cool the motor. For example, a water channel is provided between the inner cylinder and the outer cylinder of the motor. However, this method can only effectively cool the surface of the motor, and the heat generated in parts such as the rotor assembly and the stator winding cannot be effectively dissipated, resulting in low heat dissipation efficiency. Summary of the Invention

[0004] In view of this, embodiments of this application are expected to provide a motor that can effectively dissipate heat from various parts of the motor through the combination of a cooling water channel and an internal circulation air duct, thereby improving the overall heat dissipation reliability.

[0005] Embodiments of this application provide a motor, including:

[0006] An inner cylinder and an outer cylinder, at least a part of the outer cylinder is nested radially outside the circumferential direction of the inner cylinder and defines a cooling water channel;

[0007] A stator assembly and a rotor assembly, the stator assembly and the rotor assembly are arranged inside the inner cylinder;

[0008] The inner cylinder has a first air passage, the outer cylinder has a second air passage, the first air passage and the second air passage are not in communication with the cooling water channel, the first air passage and the second air passage are located on opposite sides of the cooling water channel along the axial direction, and the first air passage and the second air passage are used to communicate the space inside the inner cylinder and the space outside the outer cylinder to form a closed internal circulation air duct inside the motor.

[0009] In some embodiments, the inner cylinder includes a first cylinder body and a first connecting ring connected to each other, the outer cylinder includes a second cylinder body and a second connecting ring connected to each other, the second cylinder body is sleeved outside the circumferential direction of the first cylinder body and jointly defines the cooling water channel, the first connecting ring is located outside the second cylinder body along the axial direction away from the second connecting ring, the second connecting ring is located outside the first cylinder body along the axial direction away from the first connecting ring, the first air passage is arranged on the first connecting ring, and the second air passage is arranged on the second connecting ring.

[0010] In some embodiments, the inner cylinder further includes a plurality of water separation ribs, and the plurality of water separation ribs are arranged at intervals in the circumferential direction outside the circumferential direction of the first cylinder body.

[0011] In some embodiments, at least one first ventilation hole is formed in the first connecting ring, the at least one first ventilation hole penetrates the circumferential side wall of the first connecting ring, and the at least one ventilation hole defines at least a part of the first air passage;

[0012] At least one second ventilation hole is formed in the second connecting ring, the at least one second ventilation hole penetrates the circumferential side wall of the second connecting ring, and the at least one second ventilation hole defines at least a part of the second air passage.

[0013] In some embodiments, the motor includes an outer sealing plate, the outer sealing plate is disposed on the circumferential outer side of the second cylinder body, one end of the outer sealing plate is connected to the first connecting ring, the other end is connected to the second connecting ring, and a third air passage is formed between the outer sealing plate and the second cylinder body. The third air passage is configured to: direct the air flow flowing out from the inner cylinder through the first air passage to the second air passage, or direct the air flow flowing out from the inner cylinder through the second air passage to the first air passage.

[0014] In some embodiments, the motor includes heat dissipation ribs;

[0015] The heat dissipation ribs are disposed on the outer surface of the outer sealing plate;

[0016] And / or, the heat dissipation ribs are disposed on the circumferential outer surface of the first connecting ring;

[0017] And / or, the heat dissipation ribs are disposed on the circumferential outer surface of the second connecting ring.

[0018] In some embodiments, the motor includes a first end cover and a second end cover, the first end cover is connected to the first connecting ring, the second end cover is connected to the second connecting ring, and the first end cover and the second end cover are configured to isolate the space inside the inner cylinder from the external environment to form a closed inner circulation air duct inside the motor.

[0019] In some embodiments, the rotor assembly includes a rotating shaft and a fan, the rotating shaft passes through the first end cover and the second end cover, the fan is disposed inside the inner cylinder and is connected to the rotating shaft, and the fan can rotate under the drive of the rotating shaft to drive the air flow inside the inner cylinder to flow.

[0020] In some embodiments, the rotor assembly includes a rotor lamination and a rotating shaft, the rotor lamination is connected to the rotating shaft, a first air gap is formed between the stator assembly and the rotor lamination, a second air gap is formed inside the rotor lamination, and the inner circulation air duct forms a first circulation air path and a second circulation air path;

[0021] The first air gap, the first air passage, the third air passage, and the second air passage together form at least a part of the first circulation air path;

[0022] The second air gap, the first air passage, the third air passage, and the second air passage together form at least a portion of the second circulation air path.

[0023] In some embodiments, a portion of the circumferential outer wall of the first connecting ring protrudes outward to form a first hanging ring;

[0024] And / or, part of the circumferential outer wall of the second connecting ring protrudes outward to form a second hanging ring.

[0025] In some embodiments, the portions of the inner cylinder and the outer cylinder used to define the cooling water channel are coated with an anti-corrosion layer, or the portions of the inner cylinder and the outer cylinder used to define the cooling water channel are anti-corrosion structures.

[0026] In some embodiments, a water outlet is formed on the circumferential outer side of the outer cylinder, and the water outlet is connected to the cooling water channel. The motor includes a water channel connector, and the water channel connector is passed through the water outlet to be connected to the cooling water channel through the water outlet. The water channel connector is detachably connected to the water outlet.

[0027] In some embodiments, the water channel joint is an anti-corrosion structure, or the inner wall of the water channel joint is coated with an anti-corrosion layer.

[0028] The motor provided in the embodiment of the present application connects the space inside the inner cylinder and the space outside the outer cylinder through the first air passage and the second air passage, forming a closed inner circulation air passage inside the motor. The heat generated when the motor is running is transferred to the cooling water circuit on the one hand, and cooled by the coolant in the cooling water circuit; on the other hand, the heat is taken away by the circulation of the airflow in the space inside the inner cylinder, the first air passage, the second air passage and the space outside the outer cylinder. During the air flow, the airflow can drive the heat generated by the stator winding, the rotor assembly, etc. to various parts inside the motor, so that a space with a relatively stable temperature is formed inside the motor, and the temperature at each place is relatively suitable. The inner cylinder and the outer cylinder both define the cooling water circuit and connect the space inside the inner cylinder and the space outside the outer cylinder. The dual cooling mechanism can increase the simplicity of the motor structure while improving the cooling effect of the motor. In addition, the closed inner circulation air passage can also reduce the probability of external dust and impurities entering the motor, thereby increasing the reliability of the motor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of a motor according to an embodiment of the present application, wherein the arrows in the figure indicate the flow direction of the airflow;

[0030] Figure 2 A partial structural schematic diagram of a motor according to an embodiment of the present application;

[0031] Figure 3 An exploded schematic diagram of a partial structure of a motor according to an embodiment of the present application;

[0032] Figure 4 It is a structural schematic diagram of the inner tube;

[0033] Figure 5 It is a schematic diagram of the structure of the outer cylinder.

[0034] Description of Reference Numerals

[0035] 1-motor; 1a-cooling water circuit; 1b-first air gap;

[0036] 10-inner cylinder; 101-first cylinder body; 102-first connecting ring; 102a-first ventilation hole; 1021-first lifting ring; 103-water barrier; 11-outer cylinder; 11a-water outlet; 111-second cylinder body; 112-second connecting ring; 112a-second ventilation hole; 1121-second lifting ring; 12-outer sealing plate; 12a-third air passage; 13-heat dissipation rib; 14-first end cover; 15-second end cover; 16-stator assembly; 161-stator winding; 17-rotor assembly; 171-rotating shaft; 172-fan; 173-rotor laminations; 173a-second air gap; 18-waterway joint. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of the specific technical features in the present invention will not be described separately.

[0039] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the specific corresponding schematic diagrams, which may be the left and right directions in normal use or not.

[0040] It should be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element. "Plurality" means greater than or equal to two.

[0041] Please refer to Figures 1 to 5 , an embodiment of the present application provides a motor 1, comprising an inner cylinder 10, an outer cylinder 11, a stator assembly 16 and a rotor assembly 17.

[0042] At least a part of the outer cylinder 11 is nested radially on the circumferential outer side of the inner cylinder 10 and defines a cooling water channel 1a.

[0043] The stator assembly 16 and the rotor assembly 17 are arranged inside the inner cylinder 10.

[0044] The inner cylinder 10 has a first air passage, and the outer cylinder 11 has a second air passage. The first air passage and the second air passage are not in communication with the cooling water channel 1a. The first air passage and the second air passage are located on opposite sides of the cooling water channel 1a in the axial direction. The first air passage and the second air passage are used to communicate the space inside the inner cylinder 10 and the space outside the outer cylinder 11 to form a closed internal circulation air duct in the motor 1.

[0045] It can be understood that the inner cylinder 10 and the outer cylinder 11 are used to protect the internal components of the motor 1 and provide a cooling function. The inner cylinder 10 and the outer cylinder 11 are roughly equivalent to the housing of the motor 1.

[0046] The outer cylinder 11 can be generally in a cylindrical structure. Exemplarily, the outer cylinder 11 can be made of a metal material, such as aluminum alloy or stainless steel. The outer cylinder 11 can provide external protection for the motor 1 and reduce the probability of dust, moisture and other impurities in the external environment entering the inside of the motor 1.

[0047] The inner cylinder 10 can be generally in a cylindrical structure. Exemplarily, the inner cylinder 10 can be made of a metal material, such as aluminum alloy or stainless steel. The space inside the inner cylinder 10 can provide an installation and fixing platform for the stator assembly 16 and the rotor assembly 17. Exemplarily, the stator assembly 16 is fixed on the inner wall of the inner cylinder 10, and the rotor assembly 17 is located at the center of the stator assembly 16, with a certain air gap maintained between the two.

[0048] At least part of the outer cylinder 11 is radially nested on the circumferential outer side of the inner cylinder 10, which means that at least part of the structure of the outer cylinder 11 is radially stacked with the inner cylinder 10, and the radial direction is perpendicular to the axial direction of the inner cylinder 10 and the outer cylinder 11, that is, the outer diameter of the outer cylinder 11 is greater than the outer diameter of the inner cylinder 10, and at least part of the structure of the outer cylinder 11 surrounds the circumferential outer side of the inner cylinder 10.

[0049] It can be understood that at least part of the outer cylinder 11 is radially nested in the circumferential outer side of the inner cylinder 10. It can be that at least part of the structure of the outer cylinder 11 surrounds the circumferential outer side of the entire structure of the inner cylinder 10, or part of the structure of the inner cylinder 10 exceeds the outer cylinder 11. There is no limitation here.

[0050] The space between the outer cylinder 11 and the inner cylinder 10 can be used as a cooling water path 1a, that is, when at least part of the structure of the outer cylinder 11 is radially nested on the circumferential outer side of the inner cylinder 10, the space between the inner wall of the outer cylinder 11 and the outer wall of the inner cylinder 10 in the radial direction can be used as a cooling water path 1a, and a coolant (such as water) flows in this space to take away the heat generated when the motor 1 is running.

[0051] The stator assembly 16 is a stationary part of the motor 1. The stator assembly 16 can provide mechanical support for other components of the motor 1 (such as the rotor assembly 17), and increase the stability and rigidity of the motor 1 structure.

[0052] For example, the stator assembly 16 may include a stator winding 161, and the rotor assembly 17 may include a permanent magnet. When current passes through the stator winding 161, a magnetic field is generated. The permanent magnet interacts with the magnetic field generated by the stator assembly 16 to generate torque, thereby achieving rotation. By changing the direction and size of the magnetic field generated by the stator assembly 16, the speed and direction of the motor 1 can be controlled.

[0053] The first air passage and the second air passage are passages for air circulation. The first air passage and the second air passage are not connected to the cooling water channel 1a, which means that the first air passage, the second air passage and the cooling water channel 1a do not interfere with each other, and the coolant in the cooling water channel 1a will not flow out through the first air passage and the second air passage, and the coolant will not mix with the air.

[0054] The first air passage and the second air passage are located on opposite sides of the cooling water channel 1a along the axial direction, which means that the first air passage is located on one side of the cooling water channel 1a along the axial direction, and the second air passage is located on the other side of the cooling water channel 1a along the axial direction.

[0055] The first air passage and the second air passage are used to connect the space inside the inner cylinder 10 and the space outside the outer cylinder 11, which means that the first air passage and the second air passage can direct the air flow inside the inner cylinder 10 to the space outside the outer cylinder 11 and then direct the air flow back into the inner cylinder 10. Here, the space outside the outer cylinder 11 refers to the space located outside the outer cylinder 11 but not communicating with the external environment.

[0056] Here, a closed internal circulation air duct is formed inside the motor 1, which means that a closed space is formed inside the motor 1, and the space inside the motor 1 does not communicate with the external environment. The internal circulation air duct is a circulation air duct formed by the air flow inside the motor 1 circulating through the first air passage and the second air passage in the space inside the inner cylinder 10 and the space outside the outer cylinder 11.

[0057] Here, the power generated when the rotor assembly 17 operates can drive the air flow inside the inner cylinder 10 to move, thereby forming a circulating air path through the first air passage and the second air passage. When the air flow moves, it can drive the heat generated by structures such as the rotor assembly 17 and the stator assembly 16 to flow inside the motor 1, and then transfer it to the cooling water path 1a for cooling, improving the cooling rate.

[0058] The motor 1 provided by the embodiment of the present application connects the space inside the inner cylinder 10 and the space outside the outer cylinder 11 through the first air passage and the second air passage, forming a closed internal circulation air duct inside the motor 1. The heat generated when the motor 1 operates is, on the one hand, transferred to the cooling water path 1a and cooled by the coolant inside the cooling water path 1a; on the other hand, through the circulating flow of the air flow in the space inside the inner cylinder 10, the first air passage, the second air passage and the space outside the outer cylinder 11, the heat is taken away. During the process of air flow, the air flow can drive the heat generated by the stator winding 161, the rotor assembly 17, etc. to various parts inside the motor 1, making the space inside the motor 1 form a space with relatively stable temperature and suitable temperature everywhere. By using the inner cylinder 10 and the outer cylinder 11 to not only define the cooling water path 1a but also connect the space inside the inner cylinder 10 and the space outside the outer cylinder 11, a dual cooling mechanism can improve the cooling effect of the motor 1 while increasing the simplicity of the motor 1 structure. Moreover, the closed internal circulation air duct can also reduce the probability of external dust and impurities entering the inside of the motor 1, increasing the operating reliability of the motor 1.

[0059] The specific structures of the inner cylinder 10 and the outer cylinder 11 are not limited.

[0060] In some embodiments, please refer to Figure 1 、 Figure 4 and Figure 5The inner tube 10 includes a first tube body 101 and a first connecting ring 102 connected to each other, the outer tube 11 includes a second tube body 111 and a second connecting ring 112 connected to each other, the second tube body 111 is sleeved on the circumferential outer side of the first tube body 101, and jointly define a cooling water path 1a, the first connecting ring 102 is located on the outer side of the second tube body 111 axially away from the second connecting ring 112, the second connecting ring 112 is located on the outer side of the first tube body 101 axially away from the first connecting ring 102, the first air passage is arranged on the first connecting ring 102, and the second air passage is arranged on the second connecting ring 112.

[0061] It can be understood that the space between the outer wall of the first barrel 101 and the inner wall of the second barrel 111 defines the cooling water path 1a. The first connecting ring 102 and the second connecting ring 112 do not participate in the formation of the cooling water path 1a.

[0062] The first connecting ring 102 is located on the outside of the second barrel 111 axially away from the second connecting ring 112 , which means that after the inner barrel 10 and the outer barrel 11 are docked, the first connecting ring 102 is located on the axial outside of the second barrel 111 and can be seen from the outside of the outer barrel 11 .

[0063] The second connecting ring 112 is located on the outside of the first barrel 101 axially away from the first connecting ring 102 , which means that after the inner barrel 10 and the outer barrel 11 are docked, the second connecting ring 112 is located on the axial outside of the first barrel 101 , and the second connecting ring 112 can be seen from the outside of the outer barrel 11 .

[0064] After the inner tube 10 and the outer tube 11 are connected, the first connecting ring 102 and the second connecting ring 112 are located at opposite sides of the first barrel body 101 and the second barrel body 111 along the axial direction. The first connecting ring 102 and the second connecting ring 112 can be generally annular structures.

[0065] It can be understood that the first connecting ring 102 can serve as a connecting structure of the inner cylinder 10, connecting the inner cylinder 10 with other structures of the motor 1 to facilitate the structural integrity of the motor 1, and a first air passage is set on the first connecting ring 102. On the one hand, the first air passage is isolated from the cooling water path 1a to ensure the sealing between the two. On the other hand, the structure of the first connecting ring 102 is fully utilized. The first connecting ring 102 is close to the axial end of the inner cylinder 10, which facilitates the heat in the inner cylinder 10 to flow to the first air passage of the first connecting ring 102 driven by the airflow, so as to form an airflow circulation path with a large flow range in the motor 1.

[0066] It can be understood that the second connecting ring 112 can be used as a connecting structure of the outer cylinder 11 to connect the outer cylinder 11 with other structures of the motor 1 to facilitate the integrity of the motor 1. A second air passage is provided on the second connecting ring 112. On the one hand, the second air passage is isolated from the cooling water path 1a to ensure the sealing between the two. On the other hand, the structure of the second connecting ring 112 is fully utilized. The second connecting ring 112 is close to the axial end of the outer cylinder 11, so that the heat in the outer cylinder 11 flows to the second air passage of the second connecting ring 112 driven by the air flow, so as to form an air flow passage with a large flow range in the motor 1.

[0067] In this embodiment, the structural arrangement of the inner cylinder 10 and the outer cylinder 11 facilitates isolating the cooling water path 1a from the first air passage and the second air passage, and facilitates forming a larger air flow range in the motor 1, thereby increasing the temperature stability of various structures in the motor 1.

[0068] For some examples, see Figure 3 The inner tube 10 further includes a plurality of water blocking ribs 103 , which are arranged at intervals along the circumferential direction on the circumferential outer side of the first tube body 101 .

[0069] In this embodiment, the water barrier 103 can increase the turbulence in the cooling water path 1a, improve the heat exchange efficiency between the coolant and the surface of the inner tube 10, and the turbulence can break the boundary layer, so that the coolant and the surface of the inner tube 10 are in more complete contact, thereby more effectively removing heat. The water barrier 103 helps the coolant to be evenly distributed in the cooling water path 1a, reduces the flow resistance of the coolant in the cooling water path 1a, guides the flow direction of the coolant, avoids local overheating, and makes the temperature of each part of the motor 1 more balanced.

[0070] Of course, the water blocking ribs 103 can also increase the rigidity of the inner tube 10 and serve as a supporting structure between the inner tube 10 and the outer tube 11 to reduce wear and damage caused by vibration.

[0071] There is no limitation on the formation method of the first air passage and the second air passage.

[0072] For some examples, see Figure 4 and Figure 5 The first connecting ring 102 is formed with at least one first ventilation hole 102a, and the at least one first ventilation hole 102a penetrates the peripheral side wall of the first connecting ring 102, and the at least one ventilation hole defines at least a portion of the first air passage.

[0073] The second connection ring 112 is formed with at least one second ventilation hole 112a. The at least one second ventilation hole 112a penetrates the peripheral side wall of the second connection ring 112. The at least one second ventilation hole 112a defines at least a portion of the second air passage.

[0074] It is understandable that at least one may be one or more. Exemplarily, the number of the first ventilation holes 102a and the number of the second ventilation holes 112a are respectively more than one, so that the air flow efficiency can be increased, thereby increasing the cooling efficiency.

[0075] It should be noted that the first ventilation hole 102a and the second ventilation hole 112a may be round holes, square holes or other shapes, which are not limited here.

[0076] In this embodiment, the first ventilation hole 102a penetrates the circumferential side wall of the first connecting ring 102, and the second ventilation hole 112a penetrates the circumferential side wall of the second connecting ring 112. On the one hand, it can facilitate the connection between the axial end face of the first connecting ring 102 and the axial end face of the second connecting ring 112 and other structures of the motor 1 to form a closed internal circulation channel in the motor 1. On the other hand, the processing and manufacturing are simple and easy to operate.

[0077] For some examples, see Figure 2 and Figure 3 The motor 1 includes an outer sealing plate 12, which is arranged on the circumferential outer side of the second cylinder body 111. One end of the outer sealing plate 12 is connected to the first connecting ring 102, and the other end is connected to the second connecting ring 112. A third air passage 12a is formed between the outer sealing plate 12 and the second cylinder body 111. The third air passage 12a is used to: guide the airflow flowing out of the inner cylinder 10 through the first air passage to the second air passage, or guide the airflow flowing out of the inner cylinder 10 through the second air passage to the first air passage.

[0078] That is, the outer sealing plate 12 is connected between the first connecting ring 102 and the second connecting ring 112. The outer sealing plate 12 isolates the space outside the second barrel 111 from the external environment, so that the airflow does not flow to the external environment.

[0079] In this embodiment, the outer sealing plate 12 is provided. On the one hand, the third air passage 12a formed between the outer sealing plate 12 and the second cylinder body 111 can realize the circulation of airflow in the space inside the inner cylinder 10 and the space outside the outer cylinder 11, and isolate the airflow inside the motor 1 from the external environment, thereby increasing the circulation stability. At the same time, the design of two-way ventilation can also improve the uniformity of airflow and the cooling effect. On the other hand, the outer sealing plate 12 can provide additional mechanical support to reduce the vibration and noise of the motor 1 during operation. By arranging the structure of the outer sealing plate 12 and the outer cylinder 11, airflow can be realized without the need for additional components, and the structure of the motor 1 can be simpler and more reliable.

[0080] For some examples, see Figures 1 to 3 The motor 1 includes heat dissipation ribs 13 .

[0081] The heat dissipation ribs 13 are disposed on the outer surface of the outer sealing plate 12 .

[0082] And / or, the heat dissipation ribs 13 are disposed on the circumferential outer surface of the first connecting ring 102 .

[0083] And / or, the heat dissipation ribs 13 are disposed on the circumferential outer surface of the second connecting ring 112 .

[0084] In this embodiment, the design of the heat dissipation ribs 13 can help evenly distribute heat on the motor 1 and reduce local overheating. The heat dissipation ribs 13 can increase the surface area of ​​the motor 1 and improve the efficiency of heat transfer from the inside of the motor 1 to the external environment. Of course, the heat dissipation ribs 13 can also improve the overall structural strength and rigidity of the motor 1 and reduce vibration and noise. In addition, the heat dissipation ribs 13 can also increase the aesthetics of the motor 1 and provide certain physical protection for the motor 1 to reduce damage to the motor 1.

[0085] The heat dissipation ribs 13 may be arranged in a straight line, a wave shape or a sawtooth shape.

[0086] It can be understood that the heat dissipation ribs 13 can be disposed on at least one of the outer surface of the outer sealing plate 12 , the circumferential outer surface of the first connecting ring 102 , and the circumferential outer surface of the second connecting ring 112 .

[0087] In the embodiment where the heat dissipation ribs 13 are disposed on the circumferential outer surface of the first connecting ring 102 and / or the circumferential outer surface of the second connecting ring 112, the heat dissipation ribs 13 do not affect the air flow in the first air passage and / or the second air passage.

[0088] It can be understood that in the embodiment where the heat dissipation ribs 13 are provided, part of the heat generated when the motor 1 is running can be transferred to the cooling water channel 1a through the air flow of the internal circulation air duct, and the other part can be transferred to the heat dissipation ribs 13 through the air flow of the internal circulation air duct, and then transferred to the external environment.

[0089] For some examples, see Figure 1 The motor 1 includes a first end cover 14 and a second end cover 15. The first end cover 14 is connected to the first connecting ring 102, and the second end cover 15 is connected to the second connecting ring 112. The first end cover 14 and the second end cover 15 are used to isolate the space in the inner cylinder 10 from the external environment to form a closed internal circulation air duct in the motor 1.

[0090] It is understandable that the first end cap 14 and the second end cap 15 can be arranged at opposite ends of the motor 1 in the axial direction. The first end cap 14 can be connected to the end of the first connecting ring 102 axially away from the first barrel 101, and the second end cap 15 can be connected to the end of the second connecting ring 112 axially away from the second barrel 111.

[0091] That is to say, the first end cover 14, the second end cover 15, the outer sealing plate 12, the inner cylinder 10 and the outer cylinder 11 can jointly define a closed internal circulation air duct.

[0092] In this embodiment, the arrangement of the first end cover 14 and the second end cover 15 can facilitate the formation of a closed internal circulation air duct, isolating the space in the inner cylinder 10 from the external environment, so that the airflow only circulates inside the motor 1, reducing the probability of dust and impurities in the external environment entering the motor 1, and facilitating the motor 1 to form a fully enclosed motor 1. In the fully enclosed motor 1, dual cooling of the cooling water path 1a and the internal circulation air duct is used to increase the heat dissipation efficiency and the working reliability of the motor 1.

[0093] For some examples, see Figure 1 The rotor assembly 17 includes a rotating shaft 171 and a fan 172. The rotating shaft 171 passes through the first end cover 14 and the second end cover 15. The fan 172 is arranged in the inner tube 10 and connected to the rotating shaft 171. The fan 172 can rotate under the drive of the rotating shaft 171 to drive the air flow in the inner tube 10.

[0094] Specifically, the fan 172 can rotate with the shaft 171 , and the negative pressure generated by the rotation of the fan 172 can cause the air near the fan 172 to be sucked into the fan 172 , generating air flow inside the motor 1 , thereby taking away the heat generated by the shaft 171 and other components.

[0095] In this embodiment, the negative pressure generated by the fan 172 increases the air flow efficiency, thereby increasing the cooling reliability of the internal circulation air duct.

[0096] For some examples, see Figure 1 The rotor assembly 17 includes a rotor lamination 173 and a rotating shaft 171. The rotor lamination 173 is connected to the rotating shaft 171. A first air gap 1b is formed between the stator assembly 16 and the rotor lamination 173. A second air gap 173a is formed inside the rotor lamination 173. The inner circulation air duct forms a first circulation air path and a second circulation air path.

[0097] The first air gap 1b, the first air passage, the third air passage 12a, and the second air passage together form at least a portion of the first circulation air path.

[0098] The second air gap 173a, the first air passage, the third air passage 12a, and the second air passage together form at least a portion of the second circulation air path.

[0099] The first air gap 1b enables air flow to flow between the stator assembly 16 and the rotor laminations 173, thereby taking away the heat generated by the stator assembly 16 and the rotor assembly 17, illustratively, taking away the heat generated by the stator winding 161. The second air gap 173a enables air flow to flow within the rotor laminations 173, thereby taking away the heat generated by the rotor laminations 173 and the like.

[0100] Exemplarily, permanent magnet slots may be provided on the rotor laminations 173 to install permanent magnets.

[0101] In this embodiment, by setting the first air gap 1b and the second air gap 173a, the inner circulation air duct forms a first circulation air path and a second circulation air path, which is convenient for taking away the heat generated by the stator assembly 16 and the rotor assembly 17. The two circulation air paths increase the heat dissipation efficiency, reduce local overheating, and make the temperature of various parts inside the motor 1 more uniform.

[0102] For some examples, see Figure 4 and Figure 5 , a portion of the circumferential outer wall of the first connecting ring 102 protrudes outward to form a first hanging ring 1021.

[0103] And / or, part of the circumferential outer wall of the second connecting ring 112 protrudes outward to form a second hanging ring 1121 .

[0104] In this embodiment, the first hanging ring 1021 and the second hanging ring 1121 can be used as the hanging structure of the motor 1, which is convenient for the overall installation of the motor 1. The first hanging ring 1021 and the second hanging ring 112 are respectively formed by the first connecting ring 102 and the second connecting ring 112, so that the inner cylinder 10 and the outer cylinder 11 not only have the cooling functions of water cooling and air cooling, but also can realize the installation of the motor 1, without the need to set up an additional hanging structure, thereby increasing the structural reliability and the overall integration of the motor 1, and reducing the number of parts of the motor 1.

[0105] For example, in some embodiments, the first connecting ring 102 and the first barrel body 101 may be integrally manufactured and formed into the inner barrel 10 ; the second connecting ring 112 and the second barrel body 111 may be integrally manufactured and formed into the outer barrel 11 .

[0106] Of course, in some other embodiments, the first connecting ring 102 is an integrated structure, that is, the first connecting ring 102 as an independent structure has both the hanging function and the wind passing function, the first connecting ring 102 is integrated in the first barrel 101, and the first connecting ring 102 can be connected to the first barrel 101 by welding; the second connecting ring 112 is an integrated structure, that is, the second connecting ring 112 as an independent structure has both the hanging function and the wind passing function, the second connecting ring 112 is integrated in the second barrel 111, and the second connecting ring 112 can be connected to the second barrel 111 by welding.

[0107] In some embodiments, the portion of the inner cylinder 10 and the outer cylinder 11 used to define the cooling water channel 1a is coated with an anti-corrosion layer, or the portion of the inner cylinder 10 and the outer cylinder 11 used to define the cooling water channel 1a is an anti-corrosion structure.

[0108] It is understandable that after the internal circulation air duct transfers heat to the cooling water channel, the heat dissipation pressure of the cooling water channel will increase, so that the temperature of the coolant in the cooling water channel will also rise, which is easy to cause corrosion to the first barrel and the second barrel.

[0109] In this embodiment, by coating an anti-corrosion layer or setting the portion of the inner tube 10 and the outer tube 11 used to define the cooling water channel 1a as an anti-corrosion structure, the probability of the inner tube 10 and the outer tube 11 being corroded by the high-temperature coolant is reduced.

[0110] For some examples, see Figure 2 and Figure 3 A water outlet 11a is formed on the circumferential outer side of the outer cylinder 11, and the water outlet 11a is connected to the cooling water path 1a. The motor 1 includes a water path connector 18, and the water path connector 18 is passed through the water outlet 11a to connect with the cooling water path 1a through the water outlet 11a. The water path connector 18 and the water outlet 11a are detachably connected.

[0111] It can be understood that the water outlet 11a can be used as a transition structure to achieve communication between the water channel connector 18 and the cooling water channel 1a.

[0112] The water channel connector 18 is detachably connected to the water outlet 11a, which means that when the coolant needs to be injected or discharged, the water channel connector 18 can be connected to the water outlet 11a; when the water channel connector 18 needs to be repaired or replaced, the water channel connector 18 can be directly removed from the water outlet 11a.

[0113] In this embodiment, by setting the water channel connector 18, the connection between the water channel connector 18 and the water outlet 11a can be established or released to realize the entry and discharge of the coolant and the maintenance and replacement of the water channel connector 18, which is simpler to operate and has low use cost, and there is no need to frequently disassemble the motor 1.

[0114] In some embodiments, the water channel joint 18 is an anti-corrosion structure, or the inner wall of the water channel joint 18 is coated with an anti-corrosion layer.

[0115] In this embodiment, the probability of the water channel joint 18 being rusted by the coolant is reduced by configuring the water channel joint 18 as an anti-corrosion structure or coating the inner wall of the water channel joint 18 with an anti-corrosion layer.

[0116] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 embodiments of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0117] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A motor, characterized in that: include: An inner cylinder and an outer cylinder, wherein at least a portion of the outer cylinder is radially nested on the circumferential outer side of the inner cylinder and defines a cooling water path; A stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are arranged in the inner cylinder; The inner cylinder has a first air passage, and the outer cylinder has a second air passage. The first air passage and the second air passage are not connected to the cooling water path. The first air passage and the second air passage are located on opposite sides of the cooling water path along the axial direction. The first air passage and the second air passage are used to connect the space inside the inner cylinder and the space outside the outer cylinder to form a closed internal circulation air duct in the motor.

2. The motor according to claim 1, characterized in that The inner tube includes a first tube body and a first connecting ring connected to each other, and the outer tube includes a second tube body and a second connecting ring connected to each other, the second tube body is sleeved on the circumferential outer side of the first tube body, and together define the cooling water path, the first connecting ring is located on the outer side of the second tube body axially away from the second connecting ring, the second connecting ring is located on the outer side of the first tube body axially away from the first connecting ring, the first air passage is arranged on the first connecting ring, and the second air passage is arranged on the second connecting ring.

3. The motor according to claim 2, characterized in that The inner tube further comprises a plurality of water-blocking ribs, which are arranged at intervals along the circumferential direction on the circumferential outer side of the first tube body.

4. The motor according to claim 2, characterized in that The first connecting ring is formed with at least one first ventilation hole, the at least one first ventilation hole penetrates through the peripheral side wall of the first connecting ring, and the at least one ventilation hole defines at least a portion of the first air passage; The second connecting ring is formed with at least one second ventilation hole, and the at least one second ventilation hole passes through the peripheral side wall of the second connecting ring. The at least one second ventilation hole defines at least a portion of the second air passage.

5. The motor according to claim 2, characterized in that: The motor includes an outer sealing plate, which is arranged on the circumferential outer side of the second cylinder body, one end of the outer sealing plate is connected to the first connecting ring, and the other end is connected to the second connecting ring, and a third air passage is formed between the outer sealing plate and the second cylinder body, and the third air passage is used to: guide the airflow flowing out of the inner cylinder through the first air passage to the second air passage, or guide the airflow flowing out of the inner cylinder through the second air passage to the first air passage.

6. The motor according to claim 5, characterized in that The motor includes heat dissipation ribs; The heat dissipation ribs are arranged on the outer surface of the outer sealing plate; And / or, the heat dissipation ribs are arranged on the circumferential outer surface of the first connecting ring; And / or, the heat dissipation ribs are arranged on the circumferential outer surface of the second connecting ring.

7. The motor according to claim 2, characterized in that The motor includes a first end cover and a second end cover, wherein the first end cover is connected to the first connecting ring, and the second end cover is connected to the second connecting ring, and the first end cover and the second end cover are used to isolate the space in the inner cylinder from the external environment to form a closed internal circulation air duct in the motor.

8. The motor according to claim 7, characterized in that The rotor assembly includes a rotating shaft and a fan. The rotating shaft passes through the first end cover and the second end cover. The fan is arranged in the inner cylinder and connected to the rotating shaft. The fan can rotate under the drive of the rotating shaft to drive the airflow in the inner cylinder.

9. The motor according to claim 5, characterized in that The rotor assembly comprises a rotor lamination and a rotating shaft, the rotor lamination is connected to the rotating shaft, a first air gap is formed between the stator assembly and the rotor, a second air gap is formed inside the rotor lamination, and the inner circulation air duct forms a first circulation air path and a second circulation air path; The first air gap, the first air passage, the third air passage, and the second air passage together form at least a part of the first circulation air path; The second air gap, the first air passage, the third air passage, and the second air passage together form at least a portion of the second circulation air path.

10. The motor according to claim 2, characterized in that A portion of the circumferential outer wall of the first connecting ring protrudes outward to form a first hanging ring; And / or, part of the circumferential outer wall of the second connecting ring protrudes outward to form a second hanging ring.

11. The motor according to any one of claims 1 to 10, characterized in that: The portions of the inner cylinder and the outer cylinder used to define the cooling water channel are coated with an anti-corrosion layer, or the portions of the inner cylinder and the outer cylinder used to define the cooling water channel are anti-corrosion structures.

12. The motor according to any one of claims 1 to 10, characterized in that: A water outlet is formed on the circumferential outer side of the outer cylinder, and the water outlet is connected to the cooling water channel. The motor includes a water channel joint, and the water channel joint is passed through the water outlet to be connected to the cooling water channel through the water outlet. The water channel joint is detachably connected to the water outlet.

13. The motor according to claim 12, characterized in that The water channel joint is an anti-corrosion structure, or the inner wall of the water channel joint is coated with an anti-corrosion layer.

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