A high-efficiency cooling structure for an electric machine

Abstract

This application relates to the field of motor cooling technology, and in particular to a high-efficiency cooling structure for motors, comprising a shaft, an end cover, an air guide shroud, a bracket, and fan blades. The end cover is fitted onto the output end of the shaft, and the bracket is fitted onto the end of the shaft away from the end cover. The air guide shroud is fitted onto the end of the shaft near the end cover, and is positioned on the side of the end cover closest to the bracket. The air guide shroud is connected to the bracket, and has a first through hole for ventilation. The side of the bracket away from the air guide shroud has several air inlet holes and several air inlets. The fan blades are fitted onto the shaft, and the end cover partially surrounds the fan blades, which are used to draw cooling airflow from the air inlets and air inlet holes. The opening size of the end cover facing the air guide shroud is larger than the size of the end face of the air guide shroud closest to the end cover. An air outlet channel is formed between the end cover and the air guide shroud. This application has the effect of improving the cooling efficiency of the internal cooling structure of the motor.

Description

Technical Field

[0001] This application relates to the field of motor cooling technology, and in particular to a high-efficiency cooling structure for motors. Background Technology

[0002] Electric motors are widely used in modern industry and daily life. With continuous technological advancements, the market has placed new demands on motors, making miniaturization, high efficiency, low noise, and low vibration the development trends in the motor industry. Miniaturized motors save installation space and improve equipment integration; high efficiency means lower energy consumption and higher performance; low noise and low vibration enhance the user experience and reduce the impact on the surrounding environment.

[0003] In existing technologies, the cooling fan blades are typically mounted on top of the motor, as shown in the reference. Figure 1 In this method, the cooling fan blows air from the outside of the motor to the inside, carrying away heat through the airflow within the motor. However, this setup typically generates three airflow paths (A, B, and C) when blowing air into the motor. Path A is airflow turbulence, path B is leakage airflow, and path C is cooling airflow. When the fan blows air into the motor, some airflow bounces off the motor housing and other structures, failing to reach the motor interior but instead rebounding back to the fan, creating airflow turbulence. This not only affects the fan but also the motor's cooling efficiency. When the airflow enters the motor, the fan pushes the airflow inside, meaning... Figure 1 The airflow experiences a downward thrust. As the airflow passes around the motor, some air will leak out, causing air leakage. Figure 1 The reduced airflow in path B leads to a decrease in cooling air volume, which reduces the cooling efficiency inside the motor. Furthermore, as the fan blows air into the motor, the force on the airflow decreases as it moves further away from the fan, resulting in a decrease in airflow velocity. Consequently, the airflow force on the side of the motor away from the fan is reduced, leading to poor cooling and an inability to effectively reduce the motor temperature rise.

[0004] Therefore, how to improve the cooling efficiency of the internal cooling structure of the motor has become an urgent problem to be solved in this field. Summary of the Invention

[0005] In order to improve the cooling efficiency of the internal cooling structure of an electric motor, this application provides a high-efficiency cooling structure for an electric motor.

[0006] The high-efficiency cooling structure for electric motors provided in this application adopts the following technical solution: A high-efficiency cooling structure for an electric motor includes a shaft, an end cover, an air guide shroud, a bracket, and a fan blade. The end cover is fitted onto the output end of the shaft, and the bracket is fitted onto the end of the shaft away from the end cover. The air guide shroud is fitted onto the end of the shaft near the end cover, and is located on the side of the end cover near the bracket. The air guide shroud is connected to the bracket, and has a first through hole for ventilation. The side of the bracket away from the air guide shroud has several air inlet holes and several air inlets. The fan blade is fitted onto the shaft, and the end cover partially surrounds the fan blade. The fan blade is used to draw cooling airflow from the air inlets and the air inlet holes. The opening size of the end cover facing the air guide shroud is larger than the end face size of the air guide shroud near the end cover. An air outlet channel is formed between the end cover and the air guide shroud.

[0007] By adopting the above technical solution, the fan blades are placed inside the motor, surrounded by end covers and air guides. This allows the fan blades to draw in cooling airflow through the air inlet and air intake, rather than blowing the cooling airflow into the motor. This changes the force on the airflow from thrust to suction. The airflow entering the motor is drawn in by this suction force, seeking gaps to flow towards the fan blades. This prevents the airflow blown into the motor from rebounding, thus avoiding the rebounding airflow affecting the fan blade rotation and increasing the cooling efficiency inside the motor. Furthermore, when using the fan blades to draw air, because the fan blades are located at the output end of the shaft, the closer to the fan blades, the stronger the suction force. External air flows through the air inlet and air intake... Air enters the motor through the vent and flows through the internal structure requiring cooling under the action of the fan blades before exiting through the exhaust duct. This prevents the airflow from weakening as it flows through the motor's interior away from the fan blades, ensuring effective cooling and reducing temperature rise. By placing the fan blades inside the motor and using drawn-in air instead of blown-in air, with the air inlet located at the top and the fan blades at the bottom, external airflow is directed towards the fan blades. The gaps in the motor housing not only prevent airflow loss but also allow airflow to flow into the motor through these gaps under the action of the fan blades. This effectively prevents air leakage and further improves cooling efficiency.

[0008] Preferably, the fan blade includes a base; the base has a fourth through hole for the shaft to pass through; a plurality of blades are equally spaced on the side of the base facing the air guide shroud, and the plurality of blades extend radially from the inner diameter edge of the base to the outer diameter edge of the base; at least a portion of each blade is located within the first through hole.

[0009] By adopting the above technical solution, several radially distributed blades are equally spaced on the side of the base facing the air guide shroud. The base makes the fan blades unidirectional, and the airflow can only flow to the side of the base with blades. The side of the base without blades will not produce a suction effect, thus ensuring that the airflow in the motor is discharged from the fan blades. Moreover, at least part of the blades are located in the first through hole, so that when the fan blades are suctioning, the airflow can only enter the motor from around the air guide shroud, and cannot enter the motor from between the end cover and the air guide shroud. This avoids the situation where the airflow cannot be cooled when it enters from between the end cover and the air guide shroud, reduces the ineffective airflow, and increases the cooling efficiency to a certain extent.

[0010] Preferably, the end cap is connected to the air guide and the bracket respectively; the side of the end cap facing the fan blade is provided with a first groove for accommodating the fan blade; at least a portion of the air guide is located in the first groove.

[0011] By adopting the above technical solution, at least part of the fan blade is located in the first groove, and the end cover partially surrounds the fan blade, which provides protection for the fan blade to a certain extent and increases the compactness of the entire motor, thereby reducing the size of the motor to a certain extent.

[0012] Preferably, the end cap is provided with a connecting block on the side facing the air guide shroud, and at least a portion of the connecting block is located within the first groove; the air guide shroud has a second through hole along the axial direction for the connecting block to pass through, and the shape and size of the second through hole match the shape and size of the connecting block.

[0013] By adopting the above technical solution, the connecting block is used to connect the end cap and the bracket. The connecting block passes through the second through hole, and the shape and size of the second through hole match the shape and size of the connecting block, thereby restricting the air guide and fixing the position between the end cap and the air guide.

[0014] Preferably, it also includes a screw, and the bracket has a third through hole at the position corresponding to the connecting block for the screw to pass through, the screw passes through the third through hole and is connected to the connecting block; the connecting block has a threaded hole for connecting the screw.

[0015] By adopting the above technical solution, the bracket and the end cover are connected by screws. The screws pass through the third through hole on the bracket, and at least a portion of the screws extend into the connecting block. The screws and the threaded holes on the connecting block form a threaded connection, which ensures the reliability of the connection between the bracket, the air guide shroud and the end cover.

[0016] Preferably, it further includes a diverter sleeve, which is connected to the bracket. The diverter sleeve is used to divert the airflow entering through the air inlet and the airflow entering through the air inlet hole. The opening size of the diverter sleeve on the side closer to the bracket is larger than the opening size on the side farther away from the bracket.

[0017] By adopting the above technical solution, the airflow entering the motor through the air inlet and air outlet is divided by the flow divider sleeve, making the path of the airflow into the motor more regular, and allowing the cooling airflow to cool the internal components of the motor in layers, preventing the airflow from blowing only on a single component, which would cause uneven temperature rise among multiple components.

[0018] Preferably, it further includes a rotor assembly and a stator assembly, the rotor assembly being sleeved on the rotating shaft, the stator assembly being disposed between the bracket and the air guide shroud, and the stator assembly being connected to the bracket; the end of the diverter sleeve away from the bracket faces the rotor assembly, and there is a gap between the diverter sleeve and the rotor assembly.

[0019] By adopting the above technical solution, the cooling airflow is split by the flow divider sleeve, so that the airflow inside the flow divider sleeve blows towards the rotor assembly, and the airflow outside the flow divider sleeve blows towards the stator assembly, thereby cooling the two components respectively; and there is a gap between the flow divider sleeve and the rotor assembly to prevent the rotor assembly from rubbing against the flow divider sleeve when it rotates, thus preventing damage to the rotor assembly or the flow divider sleeve.

[0020] Preferably, a first bearing is fitted at the end of the rotating shaft away from the bracket, a second bearing is fitted at the end of the rotating shaft close to the bracket, the fan blade is disposed between the first bearing and the second bearing, and there is a gap between the fan blade and the first bearing.

[0021] By adopting the above technical solution, the first bearing and the second bearing support the two ends of the rotating shaft respectively, and the fan blade is set between the first bearing and the second bearing. The bearing restricts the rotation of the rotating shaft when the fan blade rotates, thus protecting the rotating shaft to a certain extent. In addition, there is a gap between the fan blade and the first bearing to prevent the fan blade from rubbing against the first bearing when rotating.

[0022] Preferably, the stator assembly includes a stator housing and a stator winding, the stator housing partially surrounds the stator winding, and the shape and size of the stator housing match the shape and size of the air guide shroud; a first protrusion is provided on the side of the stator housing facing the air guide shroud, the first protrusion is provided along the inner edge of the stator housing, and at least a portion of the first protrusion extends into the air guide shroud.

[0023] By adopting the above technical solution, the stator housing partially surrounds the stator winding to protect it. The shape and size of the stator housing match the shape and size of the air guide shroud to ensure installation stability. The first protrusion further defines the installation relationship between the air guide shroud and the stator housing. At the same time, the first protrusion can block the airflow entering from between the air guide shroud and the stator housing to a certain extent. The airflow entering from between the air guide shroud and the stator housing has a relatively weak cooling effect on the stator assembly or rotor assembly and is not cost-effective. Therefore, more cooling airflow is drawn in from the air inlet hole and the air inlet outlet.

[0024] Preferably, the airflow entering through the air inlet is blown toward the rotor assembly along the side of the splitter sleeve closest to the rotating shaft, and the airflow entering through the air inlet is blown toward the stator assembly along the side of the splitter sleeve away from the rotating shaft.

[0025] By adopting the above technical solution, the diversion sleeve diverts the airflow entering from the two inlets according to the location of the air inlet vent and the air inlet.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By placing the fan blades inside the motor and surrounding them with end covers and air guides, the fan blades draw in cooling airflow through the air inlet and air vent, rather than blowing the cooling airflow into the motor. This changes the force on the airflow from thrust to suction. The airflow entering the motor is attracted by the suction and flows towards the fan blades through gaps, preventing the airflow blown into the motor from rebounding. This avoids the rebounding airflow affecting the rotation of the fan blades and increases the cooling efficiency inside the motor. 2. The fan blades are located at the output end of the rotating shaft. The closer to the fan blades, the stronger the suction force on the airflow. External air enters the motor through the air inlet and air outlet. Under the action of the fan blades, it flows through the internal structure of the motor that needs to be cooled. This avoids the airflow from being reduced in strength when flowing through the motor to the side away from the fan blades, thus ensuring the cooling effect and effectively reducing the temperature rise. 3. By placing the fan blades inside the motor and using drawn-in air instead of blown-in air, the air inlet is located at the top of the motor and the fan blades are located at the bottom of the motor. The external airflow will rush towards the fan blades under the action of the fan blades. The gaps in the motor housing will not only prevent airflow from being lost, but also allow airflow to flow into the motor from the gaps in the motor housing under the action of the fan blades. This not only effectively avoids the problem of air leakage, but also further improves the cooling efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the airflow direction inside a motor in the prior art; Figure 2 This is a structural diagram of a high-efficiency cooling structure for an electric motor according to this application; Figure 3This is a perspective view of the application of a high-efficiency cooling structure for an electric motor in this application on an electric motor; Figure 4 This is a top view of the application of a high-efficiency cooling structure for an electric motor in this application on an electric motor; Figure 5 This is an exploded view of an efficient cooling structure for an electric motor, as described in this application, applied to an electric motor. Figure 6 This is a perspective view of the fan blade in a high-efficiency cooling structure for an electric motor according to this application; Figure 7 This is a structural diagram of this application in Embodiment 2; Figure 8 This is a perspective view of an efficient cooling structure for an electric motor, as described in Embodiment 2 of this application, applied to an electric motor.

[0028] Explanation of reference numerals in the attached figures: 1. Shaft; 2. End cap; 201. First groove; 3. Air guide shroud; 301. First through hole; 302. Second through hole; 4. Bracket; 401. Air inlet hole; 402. Air inlet; 403. Third through hole; 5. Fan blades; 51. Base; 52. Blades; 6. Connecting block; 601. Threaded hole; 7. Screws; 8. Diversion sleeve; 9. Rotor assembly; 10. Stator assembly; 101. Stator housing; 102. Stator winding; 1011. First protrusion; 11. First bearing; 12. Second bearing; 100. Air outlet duct. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 2 - Appendix Figure 8 This application will be described in further detail.

[0030] Example 1: This application discloses a high-efficiency cooling structure for electric motors.

[0031] Reference Figure 2A high-efficiency cooling structure for an electric motor includes a shaft 1, an end cover 2, an air guide shroud 3, a bracket 4, a fan blade 5, a connecting block 6, a screw 7, a rotor assembly, a stator assembly 10, a first bearing 11, and a second bearing 12. The end cover 2 and the bracket 4 are both fitted onto the shaft 1. The end cover 2 is fitted onto the output end of the shaft 1, and the bracket 4 is fitted onto the end of the shaft 1 away from the end cover 2. The air guide shroud 3 is fitted onto the shaft 1 and is located on the side of the end cover 2 facing the bracket 4. The rotor assembly 9 is fitted onto the shaft 1 and is located between the bracket 4 and the air guide shroud 3. The stator assembly 10 is fitted onto the outside of the rotor assembly 9 and is in contact with both the bracket 4 and the air guide shroud 3.

[0032] Reference Figure 2 The connecting block 6 is fixed to the side of the end cap 2 facing the bracket 4, and the screw 7 connects the bracket 4 and the end cap 2. In this embodiment, the end cap 2 and the connecting block 6 are integrally formed.

[0033] Reference Figure 2 The fan blade 5 is disposed between the end cover 2 and the air guide shroud 3. The air guide shroud 3 has a first through hole 301 for the shaft 1 to pass through, and at least a portion of the fan blade 5 is located within the first through hole 301.

[0034] Reference Figure 2 An air outlet channel 100 is formed between the end cap 2 and the air guide shroud 3. The cooling airflow flows through the inside of the motor and then flows out from the air outlet channel 100.

[0035] Reference Figure 2 The first bearing 11 and the second bearing 12 are respectively disposed at both ends of the rotating shaft 1, and the first bearing 11 is disposed at the end of the rotating shaft 1 near the end cover 2, and the second bearing 12 is disposed at the end of the rotating shaft 1 near the bracket 4; the first bearing 11 is disposed on the side of the fan blade 5 away from the second bearing 12, so that the fan blade 5 is located between the first bearing 11 and the second bearing 12.

[0036] Reference Figure 2 As shown in Figure D, the cooling airflow direction is as follows: the cooling airflow enters from above the support 4, flows between the rotor assembly 9 and the stator assembly 10 for cooling, and then flows out from the air outlet channel 100 between the air guide shroud 3 and the end cover 2.

[0037] Reference Figure 3The bracket 4 has an air inlet 402 and an air inlet through hole 401. The air inlet through hole 401 is located at the end of the bracket 4 and close to the rotating shaft 1. The air inlet 402 is located on the side of the bracket 4. In this embodiment, the air inlet 402 is formed by the bracket 4 opening on the side, and the stator assembly 10 only blocks part of the air inlet 402, leaving most of the air inlet 402 unblocked.

[0038] Reference Figure 3 A certain gap exists between the end cap 2 and the air guide shroud 3 to allow the airflow after heat absorption to dissipate; (Refer to...) Figure 4 The top view of the end cap 2 is generally circular. A first groove 201 is formed on the side of the end cap 2 facing the air guide shroud 3. The top view of the air guide shroud 3 is more square than that of the end cap 2. Figure 4 As can be seen, the diameter of the end cap 2 is slightly larger than the diagonal of the end face of the air guide 3, so that at least a part of the air guide 3 is inside the air guide 3.

[0039] Reference Figure 4 The air inlet vent 401 is provided in six symmetrical arrangements to ensure uniform air intake.

[0040] Reference Figure 5 The stator assembly 10 includes a stator winding 102 and a stator housing 101. The stator winding 102 is fixed to the stator housing 101. The stator housing 101 is connected to the bracket 4. The stator housing 101 has a groove on the side corresponding to the connecting block 6 for the screw 7 to pass through. The screw 7 restricts the circumferential movement of the stator housing 101 through the groove to prevent the stator assembly 10 from rotating. In this embodiment, the rotor assembly 9 is fixed to the rotating shaft 1.

[0041] Reference Figure 5 The connecting block 6 has a threaded hole 601 at one end facing the bracket 4. The threaded hole 601 is used to connect with the screw 7. The bracket 4 has a third through hole 403 for the screw 7 to pass through. The air guide shroud 3 has a second through hole 302 for the connecting block 6. The shape and size of the second through hole 302 match the shape and size of the connecting block 6. The connecting block 6 passes through the second through hole 302 and faces the bracket 4. The screw 7 passes through the third through hole 403 and enters the threaded hole 601.

[0042] Reference Figure 5The stator housing 101 has a first protrusion 1011 along its edge on the side facing the air guide shroud 3. The first protrusion 1011 extends into the air guide shroud 3 and can be used to position the air guide shroud 3 and the stator assembly 10 during installation.

[0043] Reference Figure 6 The fan blade 5 includes a base 51 and blades 52. The base 51 has a fourth through hole for the shaft 1 to pass through. The blades 52 are disposed on one side of the base 51. The number of blades 52 is odd. In this embodiment, there are thirteen blades 52. The blades 52 extend axially from the inner diameter edge of the base 51 to the outer diameter edge of the base 51.

[0044] The implementation principle of Embodiment 1 is as follows: The rotating shaft 1 passes through the second bearing 12 and the bracket 4, and the stator assembly 10 is installed in the position corresponding to the rotor assembly 9. Then, the air guide shroud 3, the fan blade 5 and the end cover 2 are sequentially fitted onto the rotating shaft 1 from the output end, so that the threaded hole 601 corresponds to the third through hole 403. The connecting block 6 passes through the second through hole 302. Then, the screw 7 passes through the third through hole 403 and is tightened with the threaded hole 601 to secure the entire structure. When the motor is powered on, the rotor assembly 9, the rotating shaft 1 and the fan blade 5 rotate at the same angular velocity. Under the action of the fan blade 5, the cooling airflow continuously flows into the motor from the air inlet through hole 401 and the air inlet 402, passes through the gap between the rotor assembly 9 and the stator assembly 10, and carries away the heat generated by the rotor assembly 9 and the stator assembly 10. Finally, it flows into the first groove 201 and flows out from the air outlet channel 100 between the end cover 2 and the air guide shroud 3.

[0045] Example 2: The difference between this embodiment and embodiment 1 is that a diversion sleeve 8 is added at the bracket 4 in this embodiment to divert the cooling airflow into the motor, thereby further increasing the cooling efficiency of the internal structure of the motor.

[0046] Reference Figure 7 One end of the diverter sleeve 8 is fixed to the bracket 4, and the other end of the diverter sleeve 8 faces the rotor assembly 9. The diverter sleeve 8 divides the airflow entering the fan into two layers. The airflow in the inner layer of the diverter sleeve 8 blows towards the rotor assembly 9, and the airflow in the outer layer of the diverter sleeve 8 blows towards the stator assembly 10. The end of the diverter sleeve 8 away from the rotor assembly 9 is located between the air inlet 402 and the air inlet through hole 401. The diameter of the end of the diverter sleeve 8 near the rotor assembly 9 is smaller than the diameter of the end of the diverter sleeve 8 away from the rotor assembly 9. The entire diverter sleeve 8 is funnel-shaped, which enhances the guiding effect of the diverter sleeve 8.

[0047] Reference Figure 7 Airflow flowing from the inside of the diverter sleeve 8 is blown toward the rotor assembly 9 and flows through the gaps between the rotor assemblies 9 (not shown in the figure) and between the rotor assembly 9 and the stator assembly 10; airflow flowing from the outside of the diverter sleeve 8 is blown toward the stator assembly 10 and flows through the gaps between the stator assemblies 10 (not shown in the figure) and between the rotor assembly 9 and the stator assembly 10.

[0048] In this embodiment, the rotor assembly 9 and the stator assembly 10 are essential structures for forming a motor and are structures known to those skilled in the art, so they are not described in detail here. The gaps between the rotor assemblies 9 are the internal gaps between the rotor assemblies 9. The rotor assembly 9 is composed of multiple magnet windings, and airflow passes through the gaps between the multiple windings. The gaps between the stator assemblies 10 are also the internal gaps between the stator subassemblies. Airflow passes through the stator housing 101 and the stator windings 102, and also through the gaps between the stator windings 102.

[0049] Reference Figure 8 The diversion sleeve 8 blocks the rotor assembly 9, allowing the airflow entering from the air inlet 402 to flow along the outside of the diversion sleeve 8.

[0050] In this embodiment, there is a gap between the flow divider sleeve 8 and the rotor assembly 9 to prevent the rotor assembly 9 from rubbing against the flow divider sleeve 8 when it rotates. Therefore, at the bottom of the flow divider sleeve 8, some airflow will merge, but this will not affect the overall cooling.

[0051] The implementation principle of Embodiment 2 is as follows: The rotating shaft 1 passes through the second bearing 12 and the bracket 4. The stator assembly 10 is installed in the position corresponding to the rotor assembly 9. Then, the air guide shroud 3, the fan blade 5, and the end cover 2 are sequentially fitted onto the rotating shaft 1 from the output end, ensuring that the threaded hole 601 corresponds to the third through hole 403. The connecting block 6 passes through the second through hole 302. Then, the screw 7 is passed through the third through hole 403 and tightened with the threaded hole 601 to secure the entire structure. When the motor is powered on, the rotor assembly 9, the rotating shaft 1, and the fan blade 5 rotate at the same angular velocity. As the blade 5 rotates, cooling airflow continuously flows into the motor from the air inlet 401 and the air inlet 402. The airflow flowing into the motor from the air inlet 402 blows towards the stator assembly 10, and the airflow flowing into the motor from the air inlet 401 blows towards the rotor assembly 9. The two cooling airflows converge at the air guide shroud 3 and, under the action of the blade 5, flow out from the first through hole 301, carrying away the heat generated by the rotor assembly 9 and the stator assembly 10. Finally, the airflow flows into the first groove 201 and out through the air outlet channel 100 between the end cover 2 and the air guide shroud 3.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-efficiency cooling structure for an electric motor, characterized in that: Includes a rotating shaft (1), an end cap (2), an air guide shroud (3), a bracket (4), and a fan blade (5); The end cap (2) is sleeved on the output end of the rotating shaft (1), and the bracket (4) is sleeved on the end of the rotating shaft (1) away from the end cap (2); The air guide shroud (3) is sleeved on one end of the rotating shaft (1) near the end cap (2), and the air guide shroud (3) is located on the side of the end cap (2) near the bracket (4); the air guide shroud (3) is connected to the bracket (4), and the air guide shroud (3) has a first through hole (301) for ventilation. The bracket (4) has several air inlet holes (401) and several air inlets (402) on the side away from the air guide shroud (3). The fan blade (5) is sleeved on the rotating shaft (1), and the end cap (2) partially surrounds the fan blade (5). The fan blade (5) is used to draw in cooling airflow from the air inlet (402) and the air inlet hole (401). The opening size of the end cap (2) facing the air guide (3) is larger than the end face size of the air guide (3) near the end cap (2); an air outlet channel (100) is formed between the end cap (2) and the air guide (3).

2. The high-efficiency cooling structure for an electric motor according to claim 1, characterized in that: The fan blade (5) includes a base (51); the base (51) has a fourth through hole for the shaft (1) to pass through; The base (51) has a plurality of blades (52) evenly spaced on the side facing the air guide shroud (3), and the plurality of blades (52) extend radially from the inner diameter edge of the base (51) to the outer diameter edge of the base (51). At least a portion of each blade (52) is located within the first through hole (301).

3. The high-efficiency cooling structure for an electric motor according to claim 1, characterized in that: The end cap (2) is connected to the air guide shroud (3) and the bracket (4) respectively; The end cap (2) is provided with a first groove (201) for accommodating the fan blade (5) on the side facing the fan blade (5). At least a portion of the air guide shroud (3) is located within the first groove (201).

4. The high-efficiency cooling structure for an electric motor according to claim 3, characterized in that: The end cap (2) is provided with a connecting block (6) on the side facing the air guide shroud (3), and at least a portion of the connecting block (6) is located in the first groove (201); the air guide shroud (3) has a second through hole (302) along the axial direction for the connecting block (6) to pass through, and the shape and size of the second through hole (302) match the shape and size of the connecting block (6).

5. The high-efficiency cooling structure for an electric motor according to claim 4, characterized in that: It also includes a screw (7), and the bracket (4) has a third through hole (403) at the position corresponding to the connecting block (6) for the screw (7) to pass through. The screw (7) passes through the third through hole (403) and is connected to the connecting block (6); the connecting block (6) has a threaded hole (601) for connecting the screw (7).

6. The high-efficiency cooling structure for an electric motor according to claim 1, characterized in that: It also includes a diversion sleeve (8), which is connected to the bracket (4). The diversion sleeve (8) is used to divert the airflow entering through the air inlet (402) and the airflow entering through the air inlet hole (401). The opening size of the diversion sleeve (8) on the side closer to the bracket (4) is larger than the opening size of the diversion sleeve (8) on the side farther away from the bracket (4).

7. The high-efficiency cooling structure for an electric motor according to claim 6, characterized in that: It also includes a rotor assembly (9) and a stator assembly (10), the rotor assembly (9) being sleeved on the rotating shaft (1), the stator assembly (10) being disposed between the bracket (4) and the air guide shroud (3), and the stator assembly (10) being connected to the bracket (4); the end of the diverter sleeve (8) away from the bracket (4) is facing the rotor assembly (9), and there is a gap between the diverter sleeve (8) and the rotor assembly (9).

8. The high-efficiency cooling structure for an electric motor according to claim 1, characterized in that: The first bearing (11) is fitted at the end of the rotating shaft (1) away from the bracket (4), and the second bearing (12) is fitted at the end of the rotating shaft (1) close to the bracket (4). The fan blade (5) is disposed between the first bearing (11) and the second bearing (12), and there is a gap between the fan blade (5) and the first bearing (11).

9. A high-efficiency cooling structure for an electric motor according to claim 7, characterized in that: The stator assembly (10) includes a stator housing (101) and a stator winding (102). The stator housing (101) partially surrounds the stator winding (102), and the shape and size of the stator housing (101) match the shape and size of the air guide shroud (3). The stator housing (101) has a first protrusion (1011) on the side facing the air guide shroud (3). The first protrusion (1011) is provided along the inner edge of the stator housing (101), and at least a portion of the first protrusion (1011) extends into the air guide shroud (3).

10. A high-efficiency cooling structure for an electric motor according to claim 7, characterized in that: The airflow entering through the air inlet (401) blows towards the rotor assembly (9) along the side of the split sleeve (8) near the rotating shaft (1), and the airflow entering through the air inlet (402) blows towards the stator assembly (10) along the side of the split sleeve (8) away from the rotating shaft (1).

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