A cooling system for a motor with cooling fins

Abstract

The application relates to the technical field of motor cooling improvement, in particular to a cooling system for a motor with cooling fins. The cooling system for the motor with the cooling fins comprises an air circulation device for generating an air pressure difference to provide flowing air, a motor base, and an air flow channel. The motor base is provided with a plurality of cooling fins on an outer surface. The air flow channel is sleeved or adjacent to the periphery of the motor base. An inlet of the air flow channel is communicated with the air circulation device. The air flow channel is used for guiding and accurately covering the cooling fin area of the motor base by the flowing air generated by the air circulation device. The application has the effects of improving the local wind speed of the cooling fin surface, destroying the thermal boundary layer of the cooling fin surface, exponentially improving the convective heat transfer coefficient, and significantly reducing the motor temperature rise without increasing the fan power.

Description

Technical Field

[0001] This application relates to the technical field of motor cooling improvement, and in particular to a cooling system for motors with heat dissipation fins. Background Technology

[0002] Currently, in order to maximize the potential of motors or reduce the use of electromagnetic materials during application, various types of motors require better heat dissipation systems. If the temperature continues to rise and reaches the temperature limit during motor operation, the motor's protection strategy will be triggered, such as reducing power or even stopping the motor to cool it down. Frequent, prolonged operation at high temperatures will shorten the motor's lifespan and reduce product stability.

[0003] To further improve the service life of motors and the stability of products, solving the problem of motor heat dissipation is imperative, especially for motor products with protection level requirements. Since it is impossible to achieve air circulation between the inside and outside of the motor for heat dissipation, it is necessary to design other heat dissipation methods and improve the heat dissipation capacity of motors through different design ideas and schemes.

[0004] In traditional motor design, especially for medium and large power motors, most adopt conventional natural cooling solutions. While some fan-cooled designs exist, almost none simultaneously cool all external surfaces of the motor. These air-cooling solutions are simplistic and crude, only dissipating heat from one side of the surface. In recent years, due to increasingly fierce market competition, motor technology has moved towards lightweighting, integration, and miniaturization. Therefore, integrating heat dissipation solutions into the motor design within limited installation space has become both necessary and urgent.

[0005] Regarding the aforementioned technologies, the inventors believe that while the existing air-cooling solutions (single-sided air cooling) on ​​the market can improve the heat dissipation capacity of the motor, the effect is limited and the maximum heat dissipation effect has not been achieved. In order to improve this problem, it is necessary to develop a heat dissipation system that can significantly improve the heat dissipation effect of the motor without increasing the complexity of the motor heat dissipation design, and can also control the design size of the motor. Summary of the Invention

[0006] In order to optimize the airflow channel and achieve efficient and uniform forced convection cooling of the heat dissipation fins on the outer surface of the motor, thereby significantly improving the heat dissipation capacity of the motor and suppressing temperature rise, this application provides a cooling system for a motor with heat dissipation fins.

[0007] This application provides a cooling system for a motor with heat dissipation fins, employing the following technical solution:

[0008] A cooling system for an electric motor with heat dissipation fins, comprising:

[0009] An air circulation device is used to generate an air pressure difference to provide airflow;

[0010] The motor base has several heat dissipation fins on its outer surface;

[0011] An air circulation channel is provided or adjacent to the periphery of the motor base. The inlet of the air circulation channel is connected to the air circulation device. The air circulation channel is used to guide the flowing air generated by the air circulation device and accurately cover the heat dissipation fin area of ​​the motor base.

[0012] By adopting the above technical solution, traditional motor cooling often uses unrestrained open-air airflow, where air rapidly diffuses outwards after leaving the fan, resulting in extremely low effective airflow over the motor's heat sink fins (air utilization rate is typically below 30%). This solution, by setting up airflow channels, "forcibly confines" the flowing air generated by the air circulation device within these channels, precisely and leak-free guiding it to cover the heat sink fin area. This significantly increases the local airflow velocity on the heat sink fin surface, disrupts the thermal boundary layer, and exponentially increases the convective heat transfer coefficient, thereby significantly reducing motor temperature rise without increasing fan power.

[0013] Optionally, the air circulation channel is formed by a motor rear end cover with an integrated ventilation duct; the inlet of the ventilation duct is located close to the air circulation device, the outlet of the ventilation duct is located towards the heat dissipation fins of the motor base, and the projected area of ​​the outlet of the ventilation duct covers the axial end of the heat dissipation fins.

[0014] By adopting the above technical solution, the air duct is directly cast or injection molded inside the rear end cover of the motor, eliminating the need for additional external pipes or covers and not occupying any radial installation space of the motor. This greatly facilitates the development of the motor towards lightweight and compact design. The ventilation duct outlet is directly aligned with the axial end of the heat dissipation fins, allowing high-pressure cold air to directly impact the root of the heat dissipation fins with the highest temperature in a jet-like manner. This localized high impact force can instantly remove a large amount of heat, eliminating heat accumulation at the end of the motor.

[0015] Optionally, the air circulation device is a fan blade coaxially mounted on the motor shaft. The fan blade is coaxially mounted on the motor shaft and rotates synchronously with the rotation of the motor shaft to generate an air pressure difference.

[0016] By adopting the above technical solution, the cooling air volume is completely synchronized with the motor speed. When the motor is running at high speed and high load (generating a lot of heat), the shaft drives the fan blades to rotate at high speed, automatically providing the maximum air volume; when the motor is running at low speed, the air volume is automatically reduced, thereby avoiding unnecessary energy consumption; in addition, no external power supply and complex control circuits are required, eliminating the risk of single-point failure due to the main motor overheating and burning out caused by the fan motor burning out.

[0017] Optionally, the air circulation device is a pre-built fan with an external power supply, and the pre-built fan is mounted on the rear end cover side of the motor.

[0018] By adopting the above technical solution, the "main motor speed" and "cooling air volume" are completely decoupled. When the motor is in a "low speed and high torque" state (such as during startup or climbing, when the main motor current is extremely high and the heat generation is severe, but the shaft speed is extremely low) or in a "just stopped and resetting" state, the coaxial fan blades cannot provide sufficient air volume. However, the external finished fan in this solution can still provide strong cooling at its rated maximum speed, effectively preventing thermal demagnetization or insulation aging of the motor under low speed and heavy load conditions.

[0019] Optionally, the airflow channel is formed by a wind-gathering baffle and the outer surface of the motor base; the wind-gathering baffle covers the periphery of the heat dissipation fins of the motor base, and a cavity channel for airflow is left between the wind-gathering baffle and the top of the heat dissipation fins.

[0020] By adopting the above technical solution, the air-concentrating baffle constructs a closed pressure chamber around the motor. When the high-pressure air generated by the air circulation device enters this cavity, the air cannot escape due to the confinement of the channel, thus establishing a uniform static pressure distribution within the cavity. Driven by the pressure difference, the cool air is evenly "squeezed" into the narrow gaps between the heat dissipation fins, solving the problem of uneven heat dissipation in traditional air cooling systems where "there is a large airflow near the fan and no airflow further away."

[0021] Optionally, the air circulation channel further includes an air-gathering pad; the air-gathering pad is disposed between the air-gathering baffle and the motor base, and is used to support and raise the air-gathering baffle to form the cavity channel between the air-gathering baffle and the top of the heat dissipation fins.

[0022] By adopting the above technical solution, the radial height of the cavity channel can be easily adjusted by changing the height of the air-gathering pad, thereby accurately matching the optimal airflow velocity for motors of different power without redesigning complex baffle molds. As a multi-point support structure, the pad firmly locks the air-gathering baffle to the motor base, greatly improving the structural rigidity of the baffle under high-speed motor operation or industrial vibration environment, and avoiding fatigue fracture caused by resonance.

[0023] Optionally, the wind-gathering baffle is provided with a mounting part for installing the air circulation device. The mounting part is formed by a stamping process to create an outwardly protruding raised structure, thereby forming the cavity channel between the mounting part and the top of the heat dissipation fin.

[0024] By adopting the above technical solution, the separate air-gathering pad and corresponding fasteners are eliminated, reducing the number of motor parts and assembly processes, and significantly reducing production and logistics management costs; the stamping integrated molding ensures the high consistency of cavity channel dimensions, avoiding air leakage or local blockage caused by the cumulative tolerance of multiple parts assembly.

[0025] Optionally, the heat dissipation fins on the outer surface of the motor base are sheet-like protrusions extending along the axial direction; or, the heat dissipation fins on the outer surface of the motor base are sheet-like protrusions distributed in a circumferential ring.

[0026] By adopting the above technical solution, this cooling system can be perfectly adapted to the two mainstream motor frame structures currently available on the market, thus expanding the scope of technical application.

[0027] Optionally, when the heat dissipation fins are circumferentially distributed sheet-like protrusions, the air pressure generated by the air circulation device accumulates in the cavity channel and flows axially before being released outward from the gap between two adjacent circumferential sheet-like protrusions.

[0028] By employing the above technical solution, when air flows axially within the cavity and is forcibly ejected outward from the gaps in the circumferential annular heat dissipation fins, the airflow direction intersects the surface of the heat dissipation fins at a 90-degree angle. This intense shearing and collision can significantly disrupt the laminar boundary layer on the surface of the heat dissipation fins, inducing local turbulence, and its heat transfer efficiency is significantly higher than that of traditional parallel flow heat transfer.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. Highly efficient and balanced heat dissipation performance: This application utilizes a dedicated airflow channel design to precisely and evenly guide the high-pressure airflow generated by the air circulation device to all outer surface areas of the motor base. The forced airflow passes through the gaps between the heat dissipation fins, greatly improving the convective heat transfer coefficient and achieving dual-enhanced heat dissipation.

[0031] 2. High air utilization and low loss: The air outlet of the air circulation channel is directly aligned with or covers the heat dissipation fin area, reducing useless air leakage during the circulation process and ensuring efficient utilization of the cooling medium.

[0032] 3. Excellent structural integration and compactness: In Scheme 1 and Scheme 2, the ventilation duct is directly integrated into the rear end cover of the motor, without increasing the radial dimension of the motor, only slightly increasing the axial length, which is extremely suitable for compact application scenarios with limited installation space.

[0033] 4. Excellent adaptability and compatibility: This application provides two main types of layouts: axial air duct and lateral air duct, which can be flexibly selected according to the specific installation space of the motor (such as axial or radial constraints); it is also compatible with axial heat dissipation fins and annular heat dissipation fins, and has extremely high promotional value. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the cooling system from two perspectives in Embodiment 1 of this application;

[0035] Figure 2 This is an exploded view of the cooling system in Embodiment 1 of this application;

[0036] Figure 3 These are schematic diagrams of the air circulation channels in Embodiments 1 and 2 of this application;

[0037] Figure 4 This is a schematic diagram of the airflow path within the cooling system in Embodiment 1 of this application;

[0038] Figure 5 This is a schematic diagram of the overall structure of the cooling system from two perspectives in Embodiment 2 of this application;

[0039] Figure 6 This is an exploded view of the cooling system in Embodiment 2 of this application;

[0040] Figure 7 This is a schematic diagram of the overall structure of the cooling system from two perspectives in Embodiment 3 of this application;

[0041] Figure 8 This is an exploded view of the cooling system in Embodiment 3 of this application;

[0042] Figure 9 This is a schematic diagram of the wind-gathering baffle in Embodiment 3 of this application;

[0043] Figure 10 This is a front cross-sectional view of the wind-gathering baffle in Embodiment 3 of this application;

[0044] Figure 11 This is a top cross-sectional view of the wind-gathering baffle in Embodiment 3 of this application;

[0045] Figure 12 This is a schematic diagram of the overall structure of the cooling system from two perspectives in Embodiment 4 of this application;

[0046] Figure 13 This is an exploded view of the cooling system in Embodiment 4 of this application;

[0047] Figure 14 This is a schematic diagram of the overall structure of the cooling system from two perspectives in Embodiment 5 of this application;

[0048] Figure 15 This is an exploded view of the cooling system in Embodiment 5 of this application.

[0049] Explanation of reference numerals in the attached drawings: 1. Air circulation device; 2. Air circulation channel; 3. Motor base; 4. Fan blade; 5. Ventilation duct; 6. Motor rear end cover; 7. Finished fan; 8. Axial heat dissipation fins; 9. Wind-gathering baffle; 10. Wind-gathering pad; 11. Annular cavity channel; 12. Groove; 13. Sponge; 14. Particle groove; 15. Mesh cover; 16. Extrusion plate; 17. Closing plate; 18. Grille opening; 19. Connecting rod; 20. Annular heat dissipation fins. Detailed Implementation

[0050] The following is in conjunction with the appendix Figures 1-15 This application will be described in further detail.

[0051] Example 1

[0052] See Figures 1-4 A cooling system for a motor with heat dissipation fins, the system comprising an air circulation device 1, an air flow channel 2, and a motor base 3 having axial heat dissipation fins 8.

[0053] Among them, the air circulation device 1 is a fan-shaped part that is not independently powered. It is coaxially fixedly mounted on the motor shaft and rotates synchronously with the motor to generate air pressure difference.

[0054] The air circulation channel 2 is achieved by the rear end cover 6 of the motor, which integrates the ventilation duct 5. The inlet of the ventilation duct 5 is close to the air circulation device 1, and its outlet precisely covers the end of the axial heat dissipation fin 8 of the motor base 3.

[0055] During operation, the motor rotates and drives the fan blades 4 to generate high-pressure airflow. The airflow is guided along the ventilation channel 5 inside the motor rear cover 6 and blown towards the gap between the axial heat dissipation fins 8. The airflow flows axially across the entire base surface, carrying away heat and significantly improving heat dissipation efficiency.

[0056] Example 2

[0057] Reference Figure 5 and Figure 6 The difference between this embodiment and Embodiment 1 is that the air circulation device 1 uses a series of prefabricated fans 7 with an external power supply, which are mounted on the side of the rear end cover 6 of the motor. The air circulation channel 2 is also the rear end cover 6 of the motor with integrated ventilation channels 5. After being powered on, the prefabricated fan 7 operates independently to generate airflow, which blows through the channel to the motor base 3 with axial heat dissipation fins 8. The advantage of this embodiment is that even when the motor is running at low speed or has just stopped, the prefabricated fan 7 can still provide maximum airflow for cooling at its rated speed.

[0058] Example 3

[0059] Reference Figure 7 and Figure 8 This embodiment discloses another cooling system structure. It includes a pre-built fan 7, an airflow channel 2, and a motor base 3 with axial heat dissipation fins 8.

[0060] In this embodiment, the air circulation channel 2 is formed by the air-concentrating baffle 9, the air-concentrating pad 10, and the outer surface of the motor base 3. The air-concentrating baffle 9 surrounds the motor base 3, and the air-concentrating pad 10 is disposed between the air-concentrating baffle 9 and the top of the heat dissipation fins of the motor base 3, raising the air-concentrating baffle 9, thereby forming an annular cavity channel 11 around the motor base 3 between the air-concentrating baffle 9 and the top of the heat dissipation fins.

[0061] The finished fan 7 is installed at the air inlet of the air-concentrating baffle 9. The high-pressure air generated by the operation of the finished fan 7 first enters the annular cavity channel 11. Under the action of pressure difference, the air is evenly distributed in the cavity, and then it is released through the gaps between the heat dissipation fins along the axial and radial directions, achieving all-round cooling.

[0062] See Figures 9-11 The side of the wind-concentrating baffle 9 away from the finished fan 7 has an integrally formed groove 12, and a sponge 13 is placed inside the groove 12. The side of the sponge 13 facing the groove opening has multiple evenly distributed particle grooves 14. A mesh cover 15 is hinged to the groove opening of the groove 12, and the mesh cover 15 is closed to the groove opening of the groove 12 by a snap fastener.

[0063] In addition, see Figure 10 and Figure 11 The wind-gathering baffle 9 is also equipped with a cleaning assembly for squeezing the sponge 13. The cleaning assembly includes a squeezing plate 16 and a closing plate 17. The groove wall of the groove 12 is provided with a grid opening 18. A connecting rod 19 is tightly slidably connected to the bottom wall of the groove 12. The squeezing plate 16 is slidably installed in the groove 12. The squeezing plate 16, the grid opening 18, and the groove wall of the groove 12 enclose a space for placing the sponge 13. One end of the connecting rod 19 is fixedly connected to the squeezing plate 16, and the other end of the connecting rod 19 is fixedly connected to the closing plate 17, and the closing plate 17 closes the grid opening 18.

[0064] Air often contains moisture and particulate impurities. After the finished fan 7 is started, the air carrying moisture and particulate impurities flows into the annular cavity channel 11. When the air passes through the groove 12, the moisture is adsorbed into the sponge 13, and the particulate impurities are buffered in the particle tank 14. When it is necessary to clean the moisture in the sponge 13, the closing plate 17 is pulled outward. The closing plate 17 drives the squeezing plate 16 to move towards the grille opening 18 through the connecting rod 19. At this time, the grille opening 18 opens, and the squeezing plate 16 squeezes the sponge 13, thereby causing the water in the sponge 13 to be discharged from the grille opening 18.

[0065] When it is necessary to replace the entire sponge 13, first remove the wind baffle 9 from the motor base 3, then open the mesh cover 15 and take the sponge 13 out of the groove 12, thus completing the replacement of the old and new sponge 13.

[0066] Example 4

[0067] Reference Figure 12 and Figure 13 This embodiment includes a finished fan 7, an air circulation channel 2, and a motor base 3 with circumferential annular heat dissipation fins 20.

[0068] The airflow channel 2 is formed by the cooperation of the air-concentrating baffle 9 and the motor base 3. Unlike embodiment 3, in this embodiment, the air-concentrating baffle 9 has an outwardly raised boss structure directly manufactured in the characteristic area where the finished fan 7 is installed through a stamping process, thus eliminating the need for a separate air-concentrating pad 10. Sufficient airflow cavity is left between this boss structure and the top of the annular heat dissipation fin 20.

[0069] The high-pressure air generated by the finished fan 7 gathers in the boss cavity, then flows along the axial direction and is forcibly squeezed out from the gaps between the various circumferential annular heat dissipation fins 20, so as to carry out efficient convective heat transfer on the annular heat dissipation fins 20.

[0070] Example 5

[0071] Reference Figure 14 and Figure 15 This embodiment includes a finished fan 7, an air circulation channel 2, and a motor base 3 with circumferential annular heat dissipation fins 20.

[0072] In this embodiment, the airflow channel 2 is formed by the cooperation of the air-concentrating baffle 9, the air-concentrating pad 10, and the motor base 3. The air-concentrating pad 10 raises the air-concentrating baffle 9 as a whole in the fan mounting area, so as to leave an airflow cavity between the baffle and the top of the annular heat dissipation fins 20. After the finished fan 7 is powered on and running, an air pressure difference is generated in the cavity, the air flows axially and is eventually released from the gap between the annular heat dissipation fins 20, thereby achieving the effect of suppressing the temperature rise of the motor.

[0073] It is worth mentioning that the wind-concentrating baffle 9 in Embodiments 3, 4, and 5 can also be optionally configured as a Venturi structure. The radial distance between the inner wall of the wind-concentrating baffle 9 and the tip of the heat dissipation fins gradually decreases along the airflow direction to form a tapered air duct.

[0074] According to the continuity equation in fluid mechanics, the flow velocity inevitably increases as the cross-sectional area of ​​the duct gradually decreases. In traditional constant-section ducts, the air temperature gradually rises along the path due to frictional resistance and heat absorption, resulting in a decrease in the temperature difference ΔT at the motor's tail end and extremely poor heat dissipation. This solution uses a tapered duct design to automatically increase the air velocity as it flows towards the motor's tail end. This increased velocity significantly increases the convective heat transfer coefficient h at the tail end, perfectly compensating for the decrease in temperature difference caused by the air temperature rise. This achieves an extremely uniform temperature distribution from the motor's head to its tail end, eliminating localized hot spots.

[0075] In summary, by setting up air circulation channel 2, the flowing air generated by air circulation device 1 is "forcibly confined" within the channel and precisely and leak-free guided to cover the heat dissipation fin area. This greatly increases the local wind speed on the surface of the heat dissipation fins, disrupts the thermal boundary layer on the surface of the heat dissipation fins, and causes the convective heat transfer coefficient h to increase exponentially, thereby significantly reducing the motor temperature rise without increasing the fan power.

[0076] 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 cooling system for a motor with heat dissipation fins, comprising: An air circulation device (1) is used to generate an air pressure difference to provide flowing air; The motor base (3) has several heat dissipation fins on its outer surface; And an air circulation channel (2) is provided or adjacent to the periphery of the motor base (3). The inlet of the air circulation channel (2) is connected to the air circulation device (1). The air circulation channel (2) is used to guide the flowing air generated by the air circulation device (1) and accurately cover the heat dissipation fin area of ​​the motor base (3).

2. A cooling system for a motor with heat dissipation fins according to claim 1, characterized in that: The air circulation channel (2) is formed by the air-gathering baffle (9) and the outer surface of the motor base (3); the air-gathering baffle (9) wraps around the heat dissipation fins of the motor base (3), and there is a cavity channel for air circulation between the air-gathering baffle (9) and the top of the heat dissipation fins.

3. A cooling system for a motor with heat dissipation fins according to claim 2, characterized in that: The air circulation channel (2) also includes a wind-gathering pad (10); the wind-gathering pad (10) is disposed between the wind-gathering baffle (9) and the motor base (3) to support and raise the wind-gathering baffle (9) to form the cavity channel between the wind-gathering baffle (9) and the top of the heat dissipation fin.

4. A cooling system for a motor with heat dissipation fins according to claim 2, characterized in that: The wind-gathering baffle (9) is provided with a mounting part for installing the air circulation device (1). The mounting part is formed by a stamping process to create an outwardly protruding raised structure, so as to form the cavity channel between the mounting part and the top of the heat dissipation fin.

5. A cooling system for a motor with heat dissipation fins according to claim 1, characterized in that: The air circulation channel (2) is formed by a motor rear end cover (6) with an integrated ventilation duct (5); the inlet of the ventilation duct (5) is located close to the air circulation device (1), the outlet of the ventilation duct (5) is located towards the heat dissipation fins of the motor base (3), and the projection area of ​​the outlet of the ventilation duct (5) covers the axial end of the heat dissipation fins.

6. A cooling system for a motor with heat dissipation fins according to claim 5, characterized in that: The air circulation device (1) is a fan blade (4) coaxially mounted on the motor shaft. The fan blade (4) is coaxially mounted on the motor shaft and rotates synchronously with the rotation of the motor shaft to generate air pressure difference.

7. A cooling system for a motor with heat dissipation fins according to claim 5, characterized in that: The air circulation device (1) is a finished fan (7) with an external power supply, and the finished fan (7) is mounted on the side of the rear end cover (6) of the motor.

8. A cooling system for a motor with heat dissipation fins according to any one of claims 2-4, characterized in that: The heat dissipation fins on the outer surface of the motor base (3) are sheet-like protrusions extending along the axial direction; or, the heat dissipation fins on the outer surface of the motor base (3) are sheet-like protrusions distributed in a ring along the circumferential direction.

9. A cooling system for a motor with heat dissipation fins according to claim 8, characterized in that: When the heat dissipation fins are circumferentially distributed sheet-like protrusions, the air pressure generated by the air circulation device (1) accumulates in the cavity channel and flows axially before being released outward from the gap between two adjacent circumferential sheet-like protrusions.

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