Motor air cooling strengthening system and strengthening cooling method

Abstract

The invention discloses a motor air cooling strengthening system. A plurality of air guide and heat dissipation fins extending in the axis direction are arranged on the outer circumferential face of a motor air cooling shell in a circumferential array in a protruding mode. A motor rear end cover is packaged at the tail end of the motor air-cooling shell, a centrifugal wind wheel synchronous with a motor rotating shaft is coaxially arranged on the rear side of the motor rear end cover, a wind wheel housing is arranged on the periphery of the centrifugal wind wheel, air inlet meshes are formed in the tail of the wind wheel housing, and the front end of the wind wheel housing is installed on the motor rear end cover. The inner side of the wind wheel housing is a centrifugal wind cavity, and an annular air outlet is formed between the inner contour of the front end of the wind wheel housing and the outer ring of the motor rear end cover; and the air cooling effect of the motor can be further enhanced.

Description

Technical Field

[0001] This invention belongs to the field of electric motors. Background Technology

[0002] During motor operation, especially high-power-density motors, a large amount of heat is generated. If heat dissipation is not timely, it will lead to decreased motor efficiency, shortened lifespan, or even damage.

[0003] Existing air-cooling systems commonly rely on centrifugal fans mounted on the motor shaft to generate cooling airflow, which is then guided through a fan shroud to the heat dissipation fins of the motor housing for heat dissipation. However, this traditional method has significant shortcomings: First, the cooling airflow blowing out from the fan shroud lacks effective constraint, easily diffusing outwards and failing to flow efficiently and centrally along the heat dissipation fins, resulting in low airflow utilization and unsatisfactory heat dissipation efficiency. The fluid simulation analysis diagram of the motor operation without a "circular arc-shaped air-cooled reinforced casing" in existing technologies is shown below. Figure 8 As shown.

[0004] Secondly, under high temperature or heavy load conditions, the efficiency of heat dissipation by air convection alone is nearing its limit and cannot meet further heat dissipation requirements. Common liquid cooling systems also have problems such as complex structure, high cost and potential leakage risks.

[0005] In addition, existing technologies have attempted to introduce evaporative cooling, but these often suffer from drawbacks such as uneven water mist distribution, unstable cooling efficiency, or overly complex structures.

[0006] Therefore, there is an urgent need for an enhanced heat dissipation solution that can effectively gather airflow and introduce efficient and uniform evaporative cooling on the basis of traditional air cooling. Summary of the Invention

[0007] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a motor air-cooling enhancement system and an enhanced cooling method, which can further enhance the air-cooling effect of the motor.

[0008] Technical Solution: To achieve the above objectives, the present invention provides a motor air-cooling enhancement system. The outer circumferential surface of the motor air-cooling housing is provided with a plurality of air-guiding and heat-dissipating fins extending along the axial direction in a circular array. A motor rear end cover is encapsulated at the rear end of the motor air-cooling housing. A centrifugal impeller, synchronously mounted on the motor shaft, is coaxially arranged behind the rear end cover. The outer circumference of the centrifugal impeller is a impeller cover, the rear end of the impeller cover has an air inlet mesh, and the front end of the impeller cover is mounted on the motor rear end cover. The inner side of the impeller cover is a centrifugal air chamber, and an annular air outlet is formed between the inner contour of the front end of the impeller cover and the outer ring of the motor rear end cover.

[0009] It also includes a downward-facing arc-shaped air-cooled reinforced cover; the arc-shaped air-cooled reinforced cover includes a tail arc body, a transition arc body and a front arc body from the tail to the front. The tail arc body and the front arc body are coaxially and integrally connected through the transition arc body, and the inner diameter of the tail arc body is smaller than the inner diameter of the front arc body; the front arc body is locked to the outside of the front end of the impeller cover.

[0010] The front arc surrounds the outer periphery of several air-guiding and heat-dissipating fins at the rear end of the motor's air-cooled housing. The cooling air blown out from the annular air outlet flows forward more concentratedly along the extension direction of the air-guiding and heat-dissipating fins under the constraint of the front arc.

[0011] Furthermore, the central angle of the arc structure of the arc-shaped air-cooled reinforced casing is greater than °.

[0012] Furthermore, several rectangular cutout windows are equidistantly arranged along the arc path of the front end.

[0013] Furthermore, a strip-shaped slot with its length direction parallel to the motor axis is provided on the front arc between any two adjacent rectangular cutout windows; a wheel set is rotatably installed in each strip-shaped slot.

[0014] The lower end of the motor's air-cooled housing is equipped with a fixed, upward-facing water tank, which contains a water intake chamber filled with water. A pulley is located on the upper side of the opening of the water tank, with the lower end of the pulley immersed in the water intake chamber. The system also includes a small auxiliary motor that can drive the pulley to rotate, and a closed-loop conveyor belt, with the lower inner side of the closed-loop conveyor belt crossing over the lower side of the pulley.

[0015] The upper inner side of the closed-loop conveyor belt crosses the outer side of the front arc body and rolls in cooperation with each wheel set; a taut section of the closed-loop conveyor belt between any two adjacent wheel sets extends into the corresponding rectangular cutout window.

[0016] Furthermore, a closed-loop sponge belt is fixedly attached to the center of the inner ring of the closed-loop conveyor belt along the conveyor belt path.

[0017] Furthermore, the two sides of the inner edge of the closed-loop conveyor belt are designated as two non-sponge belt areas.

[0018] Each wheel set includes a wheel axle fixed along its length in a corresponding strip-shaped hollowed-out groove. The front and rear ends of each wheel axle are respectively rotatably mounted with a front pulley and a rear pulley via bearings. The distance between the front pulley and the rear pulley is consistent with the width of the sponge belt. The ends of the front pulley and the rear pulley that are far apart from each other are respectively provided with a constraint outer edge and a constraint outer edge along the contour. The front pulley and the rear pulley of each wheel set are respectively rolling and cooperating with two sponge-free belt areas on the inner side of the closed-loop conveyor belt.

[0019] Each axle is equipped with a water-squeezing wheel that rotates through bearings. The water-squeezing wheel is coaxial between the front pulley and the rear pulley. The water-squeezing wheel rolls against the sponge belt on the inner side of the closed-loop conveyor belt.

[0020] Furthermore, let the length of the squeezing wheel along the axial direction be L, the width of the sponge belt be D, and the total number of wheel sets be N, satisfying L×N=D; in the axial view of the motor viewed from back to front, among the several wheel sets equidistantly arrayed along the arc path, the position of each squeezing wheel on the wheel axle changes in a gradient along the axial direction.

[0021] Furthermore, if the temperature sensor on the motor housing still detects a high temperature, a small auxiliary motor is controlled to drive the pulley to rotate slowly, thereby causing the closed-loop conveyor belt to move in a continuous circular motion along its own extension path.

[0022] Beneficial effects: This invention creatively provides a modular and reinforceable motor air-cooling system, whose innovations are mainly reflected in two aspects: structural design and working principle.

[0023] Scalable modular design: Based on the basic air-cooling structure, an innovative arc-shaped air-cooling reinforcement shell is proposed, which effectively constrains and guides the cooling air flowing out from the annular air outlet, making it flow more concentrated along the motor heat dissipation fins, significantly reducing airflow escape. This is the first stage of reinforcement.

[0024] Integrated Evaporative Cooling System: In the second embodiment, a closed-loop conveyor belt-sponge belt-wheel system is further integrated into the aforementioned casing. This system cleverly combines water absorption, water transport, evaporation, and water squeezing atomization functions by opening rectangular perforated windows and strip-shaped perforated grooves on the casing, achieving an active and controllable two-stage enhancement from simple air cooling to "air cooling + evaporative cooling".

[0025] An innovative gradient arrangement of squeezing wheels was designed. By staggering the positions of each squeezing wheel along the axial direction and satisfying the relationship L×N=D, it is ensured that any point in the width direction of the sponge belt is rolled by only one squeezing wheel during the motion cycle. This avoids localized over-drying or over-wetting, ensuring the uniformity of evaporation in all areas of the sponge belt. At the same time, after the squeezing wheels themselves are wetted, they can continuously generate uniform and fine water mist under high-speed airflow, achieving a dual effect of contact evaporation and non-contact atomized cooling.

[0026] Multi-mode coordinated heat dissipation: It simultaneously achieves three enhanced heat dissipation effects: First, the physical constraints formed by the casing and conveyor belt improve the convective heat transfer efficiency; second, the evaporation and heat absorption of the wet sponge belt in the high-speed airflow directly reduces the temperature of the cooling air; third, the water mist generated by the water squeeze wheel adheres to the motor casing and heat dissipation fins, and performs phase change heat absorption, which greatly improves the heat dissipation efficiency. Attached Figure Description

[0027] Figure 1 This is a front view of the motor in the first embodiment;

[0028] Figure 2 This is a perspective view of another motor model according to the first embodiment;

[0029] Figure 3 This is a partial cross-sectional view of the tail end of the motor in the first embodiment;

[0030] Figure 4 This is a schematic diagram of the motor tail section structure in the "second embodiment";

[0031] Figure 5 This is a schematic diagram of the "second embodiment" from rear to front along an axial perspective;

[0032] Figure 6 This is a schematic diagram of the interaction between the arc-shaped air-cooled reinforced casing and the closed-loop conveyor belt in the "second embodiment";

[0033] Figure 7 This is a schematic diagram of the arc-shaped air-cooled reinforced casing structure of the "second embodiment";

[0034] Figure 8 Fluid simulation analysis diagram for motor operation without the "arc-shaped air-cooled reinforced casing" in the existing technology. Detailed Implementation

[0035] The invention will now be further described with reference to the accompanying drawings.

[0036] like Figures 1 to 8 The motor air-cooling enhancement system shown has the following basic structure:

[0037] The device includes a motor air-cooled housing 30, on the outer periphery of which several air-guiding and heat-dissipating fins extending along the axial direction are arranged in a circular array. The rear end of the motor air-cooled housing 30 is coaxially connected to a motor rear end cover 8 by flange bolts. The outer diameter of the motor rear end cover 8 is the same as the outer diameter of the outer periphery of the motor air-cooled housing 30 after the heat dissipation fins are hidden. A centrifugal impeller 7 is coaxially arranged on the rear side of the motor rear end cover 8 and synchronized with the motor shaft 10. The outer periphery of the centrifugal impeller 7 is an impeller cover 4. The rear end of the impeller cover 4 has an air inlet mesh 6. The front end of the impeller cover 4 is coaxially locked onto the motor rear end cover 8 by bolts. The inner side of the impeller cover 4 is a centrifugal air chamber 5. The inner contour of the front end of the impeller cover 4 and the outer ring of the motor rear end cover 8 form an annular air outlet 9.

[0038] First embodiment (e.g.) Figures 1 to 3 (as shown)

[0039] It also includes a downward-facing, arc-shaped, air-cooled reinforced housing 50. The central angle of the arc structure of the arc-shaped air-cooled reinforced housing 50 is greater than 180°, preferably 200-240°, to provide a good enclosure effect. The arc-shaped air-cooled reinforced housing 50 includes, from the tail to the front, a tail-end arc body 3, a transition arc body 2, and a front-end arc body 1. The tail-end arc body 3 and the front-end arc body 1 are coaxially and integrally connected through the transition arc body 2, and the inner diameter of the tail-end arc body 3 is smaller than the inner diameter of the front-end arc body 1. The inner diameter of the tail-end arc body 3 is 200-250mm, and the inner diameter of the front-end arc body 1 is smaller than the inner diameter of the front-end arc body 1. With a diameter of 220-280mm, the transition arc body 2 smoothly connects the tail end and the front end arc body; the inner contour of the front end arc body 1 is coaxially fitted with the outer contour of the front end of the impeller housing 4, and the front end arc body 1 is locked to the outer side of the front end of the impeller housing 4 by bolts; the front end arc body 1 surrounds the outer periphery of several air-guiding heat dissipation fins at the tail end of the motor air-cooled housing 30, and the cooling air blown out from the annular air outlet 9 flows forward more concentratedly along the extension direction of the air-guiding heat dissipation fins under the constraint of the front end arc body 1, thereby reducing the degree of escape of the cooling air blown out from the annular air outlet 9 to the surroundings, and thus enhancing the air-cooling effect.

[0040] To further enhance the air-cooling effect, the following further improvements are proposed based on the structure of the "first embodiment" described above:

[0041] Second embodiment (e.g.) Figures 4 to 7 (as shown)

[0042] The front arc body 1 has several rectangular cutout windows 12 equidistantly arranged along its own arc path. Between any two adjacent rectangular cutout windows 12, the front arc body 1 is provided with a strip-shaped cutout groove 13 whose length direction is parallel to the motor axis. Each strip-shaped cutout groove 13 is rotatably equipped with a wheel set 80. The lower side of the tail end of the motor air-cooled housing 30 is provided with a fixedly installed water storage tank 23 with its opening 35 facing upward. The water storage tank 23 is a water intake chamber filled with water. A pulley 21 is provided on the upper side of the opening 35 of the water storage tank 23. The lower end of the pulley 21 is immersed in the water intake chamber. It also includes a small auxiliary motor 22 that can drive the pulley 21 to rotate. It also includes a closed-loop conveyor belt 11, which is made of rubber or polyurethane material and has high elasticity and wear resistance. The lower inner side of the closed-loop conveyor belt 11 crosses the lower side of the pulley 21.

[0043] The upper inner side of the closed-loop conveyor belt 11 crosses the outer side of the front arc body 1 and rolls in cooperation with each wheel set 80; a section of the taut closed-loop conveyor belt 11 between any two adjacent wheel sets 80 extends into the corresponding rectangular hollow window 12, and the sponge belt 11a of the extended part is exposed to the airflow to promote evaporation; a closed-loop sponge belt 11a is fixedly attached to the center position of the inner circle of the closed-loop conveyor belt 11 along the conveyor belt path. The sponge belt 11a is made of highly absorbent polyurethane foam. The two sides of the inner side of the closed-loop conveyor belt 11 are designated as two sponge-free areas 11b.

[0044] Each wheel set 80 includes a wheel axle 20 fixed along its length in the corresponding strip-shaped hollow groove 13. The front and rear ends of each wheel axle 20 are respectively rotatably mounted with a front pulley 16 and a rear pulley 18 via bearings. The distance between the front pulley 16 and the rear pulley 18 is consistent with the width of the sponge belt 11a. The ends of the front pulley 16 and the rear pulley 18 that are far apart from each other are respectively provided with an a constraint outer edge 14 and a b constraint outer edge 19 along the contour. The protrusion height of the a constraint outer edge 14 and the b constraint outer edge 19 is 2-5mm, which is used to prevent the conveyor belt from running off-center.

[0045] Each pulley group 80 has a front pulley 16 and a rear pulley 18 that roll in contact with two non-sponge belt areas 11b on the inner side of the closed-loop conveyor belt 11. Each axle 20 is rotatably mounted with a water-squeezing wheel 17 via bearings. The water-squeezing wheel 17 is made of rubber or silicone and is coaxial between the front pulley 16 and the rear pulley 18. The water-squeezing wheel 17 rolls in contact with the sponge belt 11a on the inner side of the closed-loop conveyor belt 11. The water-squeezing wheel 17 contacts the sponge belt 11a through an elastic pressing method to ensure effective water squeezing.

[0046] Let the length of the squeezing wheel 17 along its axial direction be L, the width of the sponge belt 11a be D, and the total number of wheel sets 80 be N, satisfying L×N=D. This design ensures that the entire width of the sponge belt 11a is uniformly squeezed. From the perspective of the motor axis viewed from back to front, among the several wheel sets 80 equidistantly arrayed along the arc path, the position of each squeezing wheel 17 on the wheel axle 20 varies in a gradient along the axial direction. For example, if N=3, the first squeezing wheel 17 is located at one end of the wheel axle 20, the second is located in the middle, and the third is located at the other end. This ensures that during one cycle of the sponge belt 11a moving along the extended path of the closed-loop conveyor belt 11, no position of the sponge belt 11a will be repeatedly rolled by more than one squeezing wheel 17. This gradient arrangement avoids local over-squeezing and maintains a uniform water content in the sponge belt 11a.

[0047] The working principle of the second embodiment of the improved structure:

[0048] The structure formed by the front arc body 1 and the upper part of the closed-loop conveyor belt 11 surrounds the outer periphery of several air-guiding and heat-dissipating fins at the tail end of the motor air-cooled housing 30. When the motor is running, the cooling air blown out from the annular air outlet 9 is more concentrated and flows forward along the extension direction of the air-guiding and heat-dissipating fins under the constraint of the surrounding structure formed by the front arc body 1 and the closed-loop conveyor belt 11, thereby reducing the degree to which the cooling air blown out from the annular air outlet 9 escapes to the surroundings. This surrounding structure effectively increases the airflow velocity and the impact force on the heat dissipation fins, enhancing convective heat transfer.

[0049] If, after implementing the above-mentioned heat dissipation enhancements, the temperature sensed by the temperature sensor on the motor housing is still too high, further cooling enhancement measures are required. The specific measures are as follows:

[0050] The small auxiliary motor 22 drives the pulley 21 to rotate slowly, so that the closed-loop conveyor belt 11 makes a continuous circular motion along its own extension path. During the circular motion of the closed-loop conveyor belt 11, when any part of the closed-loop conveyor belt 11 passes the lower end of the pulley 21, the sponge belt 11a on the inner side of that part of the closed-loop conveyor belt 11 will be squeezed and contracted by the wheel surface at the lower end of the pulley 21. As the linear motion of the closed-loop conveyor belt 11 continues, when the sponge belt 11a on the inner side of that part of the closed-loop conveyor belt 11 leaves the wheel surface at the lower end of the pulley 21, it will immediately expand and efficiently absorb water in the water storage tank 23. As the closed-loop conveyor belt 11 makes a continuous circular motion along its own extension path, the sponge belt 11a on the inner side of the closed-loop conveyor belt 11 continuously and efficiently absorbs water.

[0051] Meanwhile, since a taut closed-loop conveyor belt 11 between any two adjacent wheel sets 80 extends into the corresponding rectangular perforated window 12, the surface of the sponge belt 11a inside the closed-loop conveyor belt 11 in each rectangular perforated window 12 exhibits a high flow velocity. The sponge belt 11a inside the closed-loop conveyor belt 11 in each rectangular perforated window 12 is accelerated to evaporate under the drive of the high-velocity gas on the surface, thereby achieving the purpose of reducing the temperature of the cooling air blown out from the annular air outlet 9 through efficient evaporation. In the prior art, the heat dissipation effect of simple air cooling is limited in high-temperature environments. This solution significantly enhances the heat dissipation capacity through evaporative cooling.

[0052] Meanwhile, as the closed-loop conveyor belt 11 moves continuously along its extended path, the water-squeezing wheels 17 of each wheel group 80 continuously squeeze out the sponge belt 11a inside the closed-loop conveyor belt 11 in real time, achieving a water-squeezing efficiency of up to 80%. The continuously squeezed water continuously wets the water-squeezing wheels 17. Since the side of the water-squeezing wheels 17 away from the sponge belt 11a is in a high-velocity environment, the water wetted on the water-squeezing wheels 17 will be torn apart by the high-velocity air and carried into the high-velocity air in the form of water mist or small water droplets, and will quickly evaporate and dissipate heat. It will then flow forward along the extension direction of the air-cooling fins of the motor air-cooling housing 30. When the water droplets and water mist carried in the air flowing forward along the extension direction of the air-cooling fins of the motor air-cooling housing 30 are scattered on the air-cooling fins of the motor air-cooling housing 30, they will achieve the purpose of further efficient heat dissipation. The water evaporates on the fin surface, absorbing a large amount of heat and significantly reducing the motor temperature.

[0053] In the above process, from the perspective of the motor axis viewed from back to front, in the several wheel sets 80 equidistantly arrayed along the arc path, the position of each squeezing wheel 17 on the wheel axle 20 varies gradually along the axial direction. This ensures that during one cycle of movement of the sponge belt 11a along the extended path of the closed-loop conveyor belt 11, no position of the sponge belt 11a is repeatedly rolled by more than one squeezing wheel 17. Therefore, the squeezing wheels 17 of each wheel set 80 can efficiently squeeze water out of the sponge belt 11a in a relatively even manner, keeping the water volume on the sponge belt 11a relatively stable. Conversely, this makes the water volume on the surface of the sponge belt 11a inside the closed-loop conveyor belt 11 within each rectangular perforated window 12 even more even. This design ensures the uniformity and continuity of evaporative cooling, avoids localized drying or over-wetting, and optimizes heat dissipation performance.

[0054] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A motor air-cooling enhancement system, wherein the outer circumferential surface of the motor air-cooling shell (30) is provided with a plurality of air-guiding and heat dissipation fins extending along the axial direction in a circular array; the rear end of the motor air-cooling shell (30) is encapsulated with a motor rear end cover (8), and a centrifugal impeller (7) is coaxially arranged on the rear side of the motor rear end cover (8) and synchronized with the motor shaft (10); the outer circumference of the centrifugal impeller (7) is an impeller cover (4), the rear end of the impeller cover (4) is an air inlet mesh (6), and the front end of the impeller cover (4) is mounted on the motor rear end cover (8); the inner side of the impeller cover (4) is a centrifugal air chamber (5), and an annular air outlet (9) is formed between the inner contour of the front end of the impeller cover (4) and the outer ring of the motor rear end cover (8); Its features are: It also includes an arc-shaped air-cooled reinforced cover (50) with the opening facing downward; the arc-shaped air-cooled reinforced cover (50) includes a tail arc body (3), a transition arc body (2) and a front arc body (1) from the tail to the front. The tail arc body (3) and the front arc body (1) are coaxially and integrally connected through the transition arc body (2), and the inner diameter of the tail arc body (3) is smaller than the inner diameter of the front arc body (1); the front arc body (1) is locked on the outside of the front end of the wind turbine cover (4); The front arc body (1) surrounds the outer periphery of several air-guiding heat dissipation fins at the tail end of the motor air-cooled housing (30). The cooling air blown out from the annular air outlet (9) flows forward more concentratedly along the extension direction of the air-guiding heat dissipation fins under the constraint of the front arc body (1).

2. The motor air-cooling enhancement system according to claim 1, characterized in that: The central angle of the arc structure of the arc-shaped air-cooled reinforced cover (50) is greater than 180°.

3. The motor air-cooling enhancement system according to claim 1, characterized in that: Several rectangular cutout windows (12) are equidistantly arranged along the arc path of the front end (1).

4. The motor air-cooling enhancement system according to claim 3, characterized in that: A strip-shaped slot (13) with its length direction parallel to the motor axis is provided on the front arc body (1) between any two adjacent rectangular hollow windows (12); a wheel set (80) is rotatably provided in each of the strip-shaped slots (13); The motor air-cooled housing (30) has a fixedly installed water tank (23) with an upward-facing opening (35) on the lower side of its tail end. The water tank (23) is a water intake chamber filled with water. A pulley (21) is provided on the upper side of the opening (35) of the water tank (23), and the lower end of the pulley (21) is immersed in the water intake chamber. The motor air-cooled housing (30) also includes a small auxiliary motor (22) that can drive the pulley (21) to rotate. The motor air-cooled housing (30) also includes a closed-loop conveyor belt (11), the lower inner side of which crosses the lower side of the pulley (21). The upper inner side of the closed-loop conveyor belt (11) crosses the outer side of the front arc body (1) and rolls in cooperation with each of the wheel sets (80); a section of the taut closed-loop conveyor belt (11) between any two adjacent wheel sets (80) extends into the corresponding rectangular cutout window (12).

5. The motor air-cooling enhancement system according to claim 4, characterized in that: A closed-loop sponge belt (11a) is fixedly attached to the center of the inner ring of the closed-loop conveyor belt (11) along the conveyor belt path.

6. The motor air-cooling enhancement system according to claim 5, characterized in that: The two sides of the inner side of the closed-loop conveyor belt (11) are designated as two non-sponge belt areas (11b). Each wheel set (80) includes a wheel axle (20) fixed along the length direction in the corresponding strip-shaped hollow groove (13). The front and rear ends of each wheel axle (20) are respectively rotatably mounted with a front pulley (16) and a rear pulley (18) through bearings. The distance between the front pulley (16) and the rear pulley (18) is consistent with the width of the sponge belt (11a). The ends of the front pulley (16) and the rear pulley (18) that are far apart from each other are respectively provided with a constraint outer edge (14) and b constraint outer edge (19) along the contour. The front pulley (16) and the rear pulley (18) of each wheel set (80) respectively roll and cooperate with the two sponge-free belt areas (11b) on the inner side of the closed-loop conveyor belt (11). Each axle (20) is equipped with a water-squeezing wheel (17) which is rotatably mounted on a bearing. The water-squeezing wheel (17) is coaxial between the front pulley (16) and the rear pulley (18). The water-squeezing wheel (17) rolls against the sponge belt (11a) on the inner side of the closed-loop conveyor belt (11).

7. The motor air-cooling enhancement system according to claim 6, characterized in that: Let the length of the water-squeezing wheel (17) along the axial direction be L, the width of the sponge belt (11a) be D, and the total number of wheel sets (80) be N, satisfying L×N=D; in the axial view of the motor from back to front, among the several wheel sets (80) equidistantly arrayed along the arc path, the position of each water-squeezing wheel (17) on the wheel axle (20) changes in a gradient along the axial direction.

8. The working method of the motor air-cooling enhancement system according to claim 7, characterized in that: If the temperature sensor on the motor housing still detects a high temperature, the small auxiliary motor (22) is controlled to drive the pulley (21) to rotate slowly, so that the closed-loop conveyor belt (11) moves in a continuous circular motion along its own extension path.

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