A large three-phase synchronous motor with forced air cooling function

Abstract

The application relates to the technical field of synchronous motors, and discloses a large three-phase synchronous motor with forced air cooling function, which comprises a motor body, the outside of the stator of the motor body is provided with a directional air cooling module which is used for directionally supplying air blowing capacity according to temperature differences of different positions of the stator; the directional air cooling module comprises an air cooling cover, an air flow chamber, a backflow chamber, a strong air supply module and a control module, the air cooling cover is arranged on the outside of the stator and is coaxial with the stator, the inside of the air cooling cover is sequentially divided into the air flow chamber and the backflow chamber from outside to inside, the air flow chamber and the backflow chamber are coaxial and the air flow chamber is located on the outside of the backflow chamber, the strong air supply module is communicated with the air flow chamber and the backflow chamber respectively and is used for injecting high-speed flowing air into the air flow chamber and the backflow chamber; the application can realize real-time monitoring of temperature differences of positions in the circumferential direction of the stator through circumferential array temperature measuring modules on the inner wall of the air cooling cover. The control module accurately controls the opening and closing degrees of the corresponding position guide plates according to temperature measuring data.

Description

Technical Field

[0001] This invention relates to the field of synchronous motors, and more specifically, to a large three-phase synchronous motor with forced air cooling. Background Technology

[0002] Large three-phase synchronous motors, as core equipment in industrial drive systems, are widely used in large-scale industrial systems such as metallurgy, mining, and machinery manufacturing. Due to their high operating power and heavy load, these motors generate a large amount of Joule heat (I²R loss), as well as core losses and mechanical losses during operation. If this heat cannot be dissipated effectively and in a timely manner, the internal temperature of the motor will rise, which will not only reduce the service life of the insulation materials, but in severe cases, may even lead to insulation breakdown, winding burnout, and cause major equipment accidents and production downtime losses.

[0003] Traditional air-cooling systems typically supply air uniformly to the stator surface, failing to address the individual temperature differences across different locations on the stator. In actual operation, due to factors such as uneven distribution of the internal magnetic field, winding arrangement, and installation environment, the temperature distribution along the stator circumference is often uneven, resulting in localized hot spots. Therefore, we propose a large three-phase synchronous motor with forced air cooling. Summary of the Invention

[0004] This invention provides a large three-phase synchronous motor with forced air cooling function, which solves the technical problem in related technologies that the temperature distribution in the stator circumferential direction is often uneven and there are local hot spots.

[0005] This invention provides a large three-phase synchronous motor with forced air cooling function, comprising: a motor body, and a directional air cooling module sleeved on the stator of the motor body for directional air supply according to the temperature difference at different positions of the stator; The directional air-cooling module includes an air-cooling cover, an airflow chamber, a return chamber, a powerful air supply module, and a control module. The air-cooling cover is installed outside the stator and is set at the same center as the stator. The interior of the air-cooling cover is divided into an airflow chamber and a return chamber from the outside to the inside. The airflow chamber and the return chamber are set at the same center and the airflow chamber is located outside the return chamber. The powerful air supply module is connected to the airflow chamber and the return chamber respectively, and is used to inject high-speed flowing air into the airflow chamber and extract air from the return chamber. The air-cooled shroud has a circumferential array of temperature measuring modules on the inner wall near the stator. These modules are used to monitor the temperature at corresponding locations on the outer wall of the stator. The airflow chamber has rotating baffles that extend radially and pass through the airflow chamber and the return chamber in sequence. These baffles are used to guide the high-speed airflow in the airflow chamber to the outer wall of the stator. The recirculation chamber contains rotating air-scooping plates that extend radially into the gap between the stator and the inner wall of the air-cooling shroud. These plates are used to scoop up hot air near the outer wall of the stator and guide it into the recirculation chamber. The guide plates and air-scooping plates are distributed alternately in the circumferential direction. Both the guide plates and air-scooping plates are connected to the control module. The control module is configured to control the opening and closing degree of the guide plates at corresponding positions and the opening and closing degree of the air-scooping plates at adjacent positions based on the temperature measurement data from the temperature measurement module. This allows the guide plates to direct the cold air towards the high-temperature position on the outer wall of the stator, while simultaneously allowing the air-scooping plates at adjacent positions to collect the hot air squeezed out by the guide plates.

[0006] Furthermore, the powerful air supply module includes a first air chamber and a second air chamber, which are fixed to the bottom of the left and right sides of the air-cooled cover, respectively. A powerful air-cooled fan is fixedly installed in the first air chamber, and a powerful return air fan is fixedly installed in the second air chamber.

[0007] Furthermore, the exhaust port of the recirculation power fan is connected to the recirculation chamber, and the exhaust port of the air-cooled power fan is connected to the airflow chamber. The airflow directions in the airflow chamber and the recirculation chamber are opposite.

[0008] Furthermore, the control module includes a side ear chamber, which is also located inside the air-cooled shroud. The side ear chamber is located on one side of the airflow chamber and the return chamber. A first electric push column module and a second electric push column module are fixedly installed inside the side ear chamber.

[0009] Furthermore, a first pull rope is fixedly installed at the end of the telescopic arm of the first electric push column module. The other end of the first pull rope is fixedly connected to the guide plate and is used to pull the opening and closing degree of the guide plate. The first electric push column module corresponds to the guide plate one by one.

[0010] Furthermore, a second pull rope is fixedly installed at the end of the telescopic arm of the second electric push column module. The other end of the second pull rope is fixedly connected to the air shovel plate and is used to pull the opening and closing degree of the air shovel plate. The second electric push column module and the air shovel plate correspond one-to-one.

[0011] Furthermore, the back of the deflector is fixedly arrayed with a first pusher spring for always applying thrust to the deflector, and the back of the air shovel is fixedly arrayed with a second pusher spring for always applying thrust.

[0012] Furthermore, the inner wall of the air-cooled shroud is provided with air-cooled jet nozzles and return nozzles, which are distributed alternately. The air-cooled jet nozzles extend from the return nozzles at an angle and the tilt angle is adjusted in the return nozzles. The air guide plate extends from the air-cooled jet nozzles at an angle and the tilt angle is adjusted in the air-cooled jet nozzles.

[0013] Furthermore, the lower wall of the deflector is arrayed with deflector shrouds, and multiple deflector shrouds are independent of each other. An air inlet is fixedly installed on the top of the deflector shroud, and the air inlet is connected to several deflector shrouds. Air enters through the air inlet and then enters multiple deflector shrouds for diversion and pressurization.

[0014] Furthermore, air vents are provided in the gaps between the multiple air guides, and the air vents are located in the space of the return chamber to facilitate the flow of hot air in the return chamber.

[0015] The beneficial effects of this invention are as follows: This invention utilizes a circumferential array temperature measurement module on the inner wall of the air-cooled cover to monitor temperature differences at various locations along the stator's circumference in real time. Based on the temperature measurement data, the control module precisely controls the opening and closing of the guide vanes at corresponding locations, concentrating and directing cold air towards the high-temperature region. This achieves "on-demand" directional cooling, effectively solving the problem of insufficient localized heat dissipation caused by traditional uniform air cooling, and significantly improving heat dissipation efficiency and cooling uniformity. This invention innovatively incorporates air-scooping plates that are alternately distributed with the guide vanes. When the guide vanes blow cold air into the high-temperature region, the adjacent air-scooping plates, under the control of the regulating module, actively "scoop up" the hot air squeezed out from the stator wall and guide it into the return chamber. This "push-pull" airflow organization method rapidly disrupts the hot air layer on the stator surface, accelerates the replacement of cold and hot air, and greatly improves heat exchange efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the air-cooled shroud of the present invention, viewed from the right. Figure 3 This is the invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the left-side cross-sectional structure of the air-cooled cover of the present invention; Figure 5 This is a schematic diagram of the guide plate structure of the present invention; Figure 6 This is a schematic diagram of the lower wall structure of the guide plate of the present invention; Figure 7 This is a schematic diagram of the air shovel plate structure of the present invention.

[0017] In the diagram: 11. Motor body; 2. Directional air-cooling module; 21. Air-cooling cover; 211. Airflow chamber; 212. Return chamber; 213. Side ear chamber; 22. First air chamber; 23. Air-cooled high-power fan; 24. Second air chamber; 25. Return high-power fan; 27. Temperature measurement module; 28. Air-shoveling plate; 29. ​​Guide plate; 291. Air inlet; 201. Guide cover; 202. Air-cooled jet nozzle; 203. Return port; 31. Air outlet; 32. First push plate spring; 34. First electric push column module; 35. First pull rope; 36. Second electric push column module; 37. Second pull rope; 38. Second push plate spring. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] Example 1 like Figures 1-7 As shown, a large three-phase synchronous motor with forced air cooling function includes: a motor body 11. A directional air cooling module 2 is sleeved on the stator of the motor body 11. This module is used to supply air in a directional manner according to the temperature difference at different positions of the stator, thereby solving the problem of local overheating caused by uneven heat generation due to uniform distribution of cooling air in traditional air cooling methods.

[0020] The directional air-cooling module 2 specifically includes: an air-cooling shroud 21, an airflow chamber 211, a return chamber 212, a powerful air supply module, and a control module. The air-cooling shroud 21 is cylindrical, precisely covering the outside of the stator and concentrically positioned with it. This concentric layout ensures a uniformly wide annular gap between the inner wall of the air-cooling shroud 21 and the outer wall of the stator, providing stable space for axial flow and radial exchange of airflow. The interior of the air-cooling shroud 21 is divided into the airflow chamber 211 and the return chamber 212 from the outside in. The airflow chamber 211 and the return chamber 212 are also concentrically positioned, with the airflow chamber 211 located outside the return chamber 212, forming a double-layer flow channel structure of "external supply and internal return." This compact concentric circle design shortens the injection path of the cold air, reducing frictional resistance, and achieves physical isolation between hot and cold air in space, effectively preventing short-circuiting of the hot airflow and improving heat exchange efficiency.

[0021] The powerful air supply module is connected to the airflow chamber 211 and the return chamber 212 respectively. Its specific function is to inject high-speed flowing air into the airflow chamber 211, and at the same time, as an active power source, extract hot air from the return chamber 212, thereby creating a continuous forced convection circulation within the system.

[0022] To achieve fixed-point temperature sensing, the air-cooled shroud 21 has a circumferential array of temperature measuring modules 27 near the inner wall of the stator. This array can be uniformly distributed at intervals of 30 degrees or 15 degrees, and the number can be increased or decreased according to the power rating and size of the motor body 11. The temperature measuring modules 27 are used to monitor the temperature at corresponding locations on the outer wall of the stator, providing real-time, high spatial resolution temperature field data for subsequent intelligent control.

[0023] The core actuator of this invention lies in the air guiding and air-shoveling assembly. Specifically, a guide plate 29 is arranged in a rotating array within the airflow chamber 211. The guide plate 29 extends radially and passes sequentially through the airflow chamber 211 and the return chamber 212. Its function is to guide the high-speed airflow in the airflow chamber 211 along the guide plate 29, changing its flow direction from purely axial or circumferential flow to a high-speed jet directed radially inward, precisely blowing it towards the outer wall of the stator. Simultaneously, an air-shoveling plate 28 is arranged in a rotating array within the return chamber 212. The air-shoveling plate 28 also extends radially, but its end extends further until it enters the gap between the stator and the inner wall of the air-cooled shroud 21. Its function is to "shovel up" the layer of hot air adhering to the outer wall of the stator, heated by heat exchange, and guide it into the return chamber 212, thereby breaking the thermal boundary layer and accelerating the discharge of hot air.

[0024] In terms of spatial layout, the guide vanes 29 and air-shoveling plates 28 are alternately distributed circumferentially, meaning that an air-shoveling plate 28 is adjacent to a guide vane 29, and so on. This alternating "blowing and sucking" structural design forms a highly efficient "blowing-collecting" unit in a microscopic local area. Cold air is blown towards the heat source surface, carrying away heat, and is then quickly sucked away by the adjacent air-shoveling plates 28, preventing hot air from spreading laterally and heating adjacent areas, greatly improving the targeting and cleanliness of local cooling.

[0025] Furthermore, both the deflector 29 and the air-shoveling plate 28 are connected to the control module. The control module is configured with core control logic: based on the temperature measurement data from the temperature measurement module 27, it controls the opening and closing degree of the deflector 29 at the corresponding position and the opening and closing degree of the air-shoveling plate 28 at the adjacent position. The ultimate goal is to direct the deflector 29 to blow cold air towards the high-temperature position on the outer wall of the stator, while simultaneously ensuring that the air-shoveling plate 28 at the adjacent position immediately collects the hot air squeezed out by the deflector 29.

[0026] For example, when a temperature measuring module 27 detects a temperature T1 significantly higher than its circumferential average temperature T_avg, the control module determines this to be a hot spot. Subsequently, the control module issues a command to increase the opening angle of the deflector 29 directly opposite the hot spot, from a default small opening to, for example, 45 degrees or 60 degrees, thereby allowing more high-speed cold air to be directed towards the hot spot. Simultaneously, to accelerate the removal of hot air, the control module also increases the opening angle of the two air-shoveling plates 28 adjacent to the deflector 29 (clockwise and / or counterclockwise), enhancing their "shoveling" flow rate. Conversely, for areas with normal temperatures, the deflector 29 and air-shoveling plates 28 remain at a small opening or are completely closed to reduce unnecessary airflow consumption. This independent, point-by-point control strategy based on real-time temperature field feedback enables "on-demand allocation" of cooling air volume. Compared with the traditional uniform air cooling method, it can reduce the temperature of local hot spots by about 15-25℃ under the same total air volume, or significantly reduce the total power consumption of the fan while ensuring the same temperature rise, with energy saving effect of more than 30%.

[0027] Example 2 This embodiment refines the specific implementation of the powerful gas supply module and the control module based on embodiment 1.

[0028] The high-powered air supply module includes a first air chamber 22 and a second air chamber 24. The first air chamber 22 and the second air chamber 24 are respectively fixed to the bottom of the left and right sides of the air-cooled cover 21. Placing the air chambers at the bottom helps stabilize the center of gravity of the equipment and also facilitates the connection and maintenance of pipelines. Furthermore, a high-powered air-cooled fan 23 is fixedly installed in the first air chamber 22, and a high-powered return fan 25 is fixedly installed in the second air chamber 24.

[0029] To form independent supply and return air circuits, the exhaust port of the return powerful fan 25 is connected to the return chamber 212, and the exhaust port of the air-cooled powerful fan 23 is connected to the airflow chamber 211. More importantly, the airflow directions in the airflow chamber 211 and the return chamber 212 are opposite. As a preferred but not limiting design, the airflow in the airflow chamber 211 can flow at high speed in a clockwise direction, forming a high-pressure "air ring" to provide uniform intake static pressure for each guide plate 29; while the airflow in the return chamber 212 can flow counterclockwise, forming a negative-pressure "air collecting ring" to facilitate the collection of hot air from each air scraper 28 and its unified delivery to the return powerful fan 25 for discharge. This reverse flow design increases the flow path length of hot and cold air, optimizes pressure distribution, and prevents mutual interference between supply and return air.

[0030] Furthermore, the control module includes a side ear chamber 213. The side ear chamber 213 is also located inside the air-cooled shroud 21, situated on one side of the airflow chamber 211 and the return chamber 212, for example, at one end along the axial direction. A first electric push-column module 34 and a second electric push-column module 36 are fixedly installed inside the side ear chamber 213. Centralizing the actuators within the side ear chamber 213 facilitates unified sealing and protection, improving reliability in harsh industrial environments.

[0031] As a precise transmission method, the end of the telescopic arm of the first electric push column module 34 is fixedly equipped with a first pull rope 35, the other end of which is fixedly connected to the guide plate 29 for pulling the opening and closing degree of the guide plate 29. The first electric push column module 34 corresponds one-to-one with the guide plate 29. Similarly, the end of the telescopic arm of the second electric push column module 36 is fixedly equipped with a second pull rope 37, the other end of which is fixedly connected to the air-shoveling plate 28 for pulling the opening and closing degree of the air-shoveling plate 28. The second electric push column module 36 corresponds one-to-one with the air-shoveling plate 28.

[0032] By adopting a pull-rope drive method, the electric push column module can be kept away from the high-temperature and high-humidity area around the stator, and only the high-temperature resistant pull rope and simple rotation mechanism are placed in the air duct, which significantly improves the electrical reliability and service life of the system.

[0033] To achieve autonomous reset of the opening angle, a first pusher spring 32 is fixedly arrayed on the back of the deflector plate 29, which continuously applies a thrust to the deflector plate 29, causing it to tend to return to the closed state. A second pusher spring 38 is fixedly arrayed on the back of the air-shoveling plate 28, which continuously applies a thrust to the air-shoveling plate 28. When the first electric pusher module 34 retracts and releases the first pull rope 35, the first pusher spring 32 pushes the deflector plate 29 to rotate, reducing its opening or even closing it. Conversely, when the first electric pusher module 34 extends and pulls the first pull rope 35, the deflector plate 29 opens against the spring force. This antagonistic "pull rope-spring" design is simple, reliable, and inexpensive.

[0034] Furthermore, the inner wall of the air-cooled shroud 21 is provided with air-cooled jet nozzles 202 and return ports 203, which are alternately distributed. The air-shoveling plate 28 extends obliquely from the return port 203, and its tilt angle is adjusted within the return port 203. The guide plate 29 extends obliquely from the air-cooled jet nozzle 202, and its tilt angle is adjusted within the air-cooled jet nozzle 202. This design ensures that when the guide plate 29 and the air-shoveling plate 28 rotate, their roots always maintain a small gap with their respective openings, reducing airflow leakage and ensuring the sensitivity and accuracy of the movement.

[0035] Example 3 The lower wall of the deflector 29 (the side facing the stator) is arrayed with multiple deflector shrouds 201, and these deflector shrouds 201 are independent of each other. An air inlet 291 is fixedly installed on the top of each deflector shroud 201, and the air inlet 291 is interconnected with the deflector shrouds 201. During operation, air enters through the air inlet 291 and is then distributed into the multiple deflector shrouds 201 for diversion and pressurization.

[0036] Each guide vane 201 can be designed as a gradually narrowing nozzle shape. According to the fluid continuity equation and Bernoulli's principle, when airflow enters the wider cavity from the inlet 291 and then flows through the gradually narrowing guide vane 201, the flow area decreases, the flow velocity increases, the dynamic pressure increases, and the static pressure decreases. This helps to further accelerate the air with a certain dynamic pressure in the airflow chamber 211, forming a higher-velocity impact jet that precisely strikes localized hot spots on the stator surface. Meanwhile, to avoid affecting the normal operation of the return chamber 212, air vents 31 are provided in the gaps between the multiple guide shrouds 201. The air vents 31 are positioned precisely within the space of the return chamber 212 to facilitate the flow of hot air within it. This means that even with the addition of guide shrouds 201 to the guide plate 29, sufficient openings or gaps are still maintained on its surface, allowing the hot air in the return chamber 212 to pass through the surface of the guide plate 29, flow smoothly to the air shovel plate 28, and be drawn away, without forming a stagnant area on the back of the guide plate 29. This design embodies the ingenious idea of ​​structural integration and functional decoupling.

[0037] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the present embodiments, all of which are within the protection scope of the present embodiments.

Claims

1. A large three-phase synchronous motor with forced air cooling function, characterized in that, include: The motor body (11) has a directional air-cooling module (2) fitted on the outside of the stator of the motor body (11) for directional air supply according to the temperature difference at different positions of the stator; The directional air-cooling module (2) includes an air-cooling cover (21), an airflow chamber (211), a return chamber (212), a powerful air supply module, and a control module. The air-cooling cover (21) is installed outside the stator and is arranged concentrically with the stator. The interior of the air-cooling cover (21) is divided into an airflow chamber (211) and a return chamber (212) from the outside to the inside. The airflow chamber (211) and the return chamber (212) are arranged concentrically, and the airflow chamber (211) is located outside the return chamber (212). The powerful air supply module is connected to the airflow chamber (211) and the return chamber (212) respectively, and is used to inject high-speed flowing air into the airflow chamber (211) and extract air from the return chamber (212). The air-cooled cover (21) has temperature measuring modules (27) arranged circumferentially near the inner wall of the stator. The temperature measuring modules (27) are used to monitor the temperature of the corresponding position on the outer wall of the stator. The airflow chamber (211) has a rotating array of guide plates (29), which extend radially and pass through the airflow chamber (211) and the return chamber (212) in sequence, and are used to guide the high-speed airflow in the airflow chamber (211) along the guide plates (29) to blow towards the outer wall of the stator; The reflux chamber (212) has rotating air-scooping plates (28) that extend radially into the gap between the stator and the inner wall of the air-cooled shroud (21) to scoop up hot air near the outer wall of the stator and introduce it into the reflux chamber (212). The guide plate (29) and the air-scooping plate (28) are alternately distributed circumferentially. Both the guide plate (29) and the air-scooping plate (28) are connected to the control module. The control module is configured to control the opening and closing degree of the guide plate (29) at the corresponding position and the opening and closing degree of the air-scooping plate (28) at the adjacent position according to the temperature measurement data of the temperature measurement module (27), so that the guide plate (29) blows cold air in a directional direction to the high temperature position of the outer wall of the stator, while the air-scooping plate (28) at the adjacent position is taken away by the hot air squeezed out by the guide plate (29).

2. A large three-phase synchronous motor with forced air cooling function according to claim 1, characterized in that, The powerful air supply module includes a first air chamber (22) and a second air chamber (24). The first air chamber (22) and the second air chamber (24) are respectively fixed at the bottom of the left and right sides of the air-cooled cover (21). A powerful air-cooled fan (23) is fixedly installed in the first air chamber (22), and a powerful return fan (25) is fixedly installed in the second air chamber (24).

3. A large three-phase synchronous motor with forced air cooling function according to claim 2, characterized in that, The exhaust port of the recirculation power fan (25) is connected to the recirculation chamber (212), and the exhaust port of the air-cooled power fan (23) is connected to the airflow chamber (211). The airflow directions in the airflow chamber (211) and the recirculation chamber (212) are opposite.

4. A large three-phase synchronous motor with forced air cooling function according to claim 1, characterized in that, The control module includes a side ear chamber (213), which is also located inside the air-cooled shroud (21). The side ear chamber (213) is located on one side of the airflow chamber (211) and the return chamber (212). The side ear chamber (213) is fixedly equipped with a first electric push column module (34) and a second electric push column module (36).

5. A large three-phase synchronous motor with forced air cooling function according to claim 4, characterized in that, The first electric push column module (34) has a first pull rope (35) fixedly installed at the end of its telescopic arm. The other end of the first pull rope (35) is fixedly connected to the guide plate (29) and is used to pull the opening and closing degree of the guide plate (29). The first electric push column module (34) corresponds to the guide plate (29) one by one.

6. A large three-phase synchronous motor with forced air cooling function according to claim 5, characterized in that, The second electric push column module (36) has a second pull rope (37) fixedly installed at the end of its telescopic arm. The other end of the second pull rope (37) is fixedly connected to the air shovel plate (28) and is used to pull the opening and closing degree of the air shovel plate (28). The second electric push column module (36) corresponds one-to-one with the air shovel plate (28).

7. A large three-phase synchronous motor with forced air cooling function according to claim 6, characterized in that, The back of the guide plate (29) is fixedly arrayed with a first push plate spring (32) for always applying thrust to the guide plate (29), and the back of the air scoop plate (28) is fixedly arrayed with a second push plate spring (38) for always applying thrust.

8. A large three-phase synchronous motor with forced air cooling function according to claim 7, characterized in that, The inner wall of the air-cooled shroud (21) is provided with an air-cooled jet nozzle (202) and a return port (203). The air-cooled jet nozzle (202) and the return port (203) are alternately distributed. The air-shoveling plate (28) extends out of the return port (203) at an angle and the tilt angle is adjusted in the return port (203). The guide plate (29) extends out of the air-cooled jet nozzle (202) at an angle and the tilt angle is adjusted in the air-cooled jet nozzle (202).

9. A large three-phase synchronous motor with forced air cooling function according to claim 8, characterized in that, The lower wall of the guide plate (29) is arrayed with guide hoods (201), and multiple guide hoods (201) are independent of each other. An air inlet (291) is fixedly provided on the top of the guide hood (201). The air inlet (291) is connected to several guide hoods (201). Air enters through the air inlet (291) and then enters multiple guide hoods (201) for diversion and pressurization.

10. A large three-phase synchronous motor with forced air cooling function according to claim 9, characterized in that, An air vent (31) is provided in the gap between the multiple air guides (201), and the air vent (31) is located in the space of the return chamber (212) for the flow of hot air in the return chamber (212).

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