An electric motor with an adaptive adjustment inner circulating air path

Abstract

The application relates to a motor with self-adaptive adjustment of an internal circulating air path, and belongs to the technical field of motor cooling and heat dissipation. The motor with self-adaptive adjustment of an internal circulating air path solves the technical problems that the existing motor bearing has no special cooling air path and cannot be self-adaptively adjusted according to real-time running temperature rise. The motor with self-adaptive adjustment of an internal circulating air path comprises a base, a web shaft, an axial air passage formed between webs of the web shaft, an aluminum casting rotor, an air gap arranged between a stator iron core with windings and the aluminum casting rotor, a centrifugal fan, a terminal box, a heat dissipation assembly for heat dissipation of an end shaft bearing, an air path adjustment assembly for adjustment of the air path, a flow guide assembly, a temperature acquisition assembly, and a control system. The control system adjusts the air path adjustment assembly by calculating a self-adaptive adjustment coefficient S, a temperature rise and a temperature rise rate according to the temperature collected by the temperature acquisition assembly. Compared with the prior art, the motor has the advantages of special cooling air path for the end shaft bearing, improved motor heat dissipation efficiency and service life, self-adaptive adjustment according to real-time temperature rise, high intelligent degree and the like.

Description

Technical Field

[0001] This invention belongs to the field of motor cooling and heat dissipation technology, specifically relating to a motor with an adaptive adjustment of the internal circulation airflow path. Background Technology

[0002] Existing optimization schemes for the internal airflow of 6kV and 10kV Y2 general-purpose and YB3 explosion-proof high-voltage three-phase asynchronous motors all adopt a fixed passive cooling structure. The mainstream improvement methods are mostly to open holes in the stator core, add fixed air ducts, and install fixed wind baffles. The overall optimization approach only focuses on the heat dissipation of the stator core and winding body to reduce the temperature rise of the windings and core. There is no targeted bearing heat dissipation design. The non-shaft extension bearing has good heat dissipation due to its proximity to the non-shaft extension external fan. The shaft extension bearing of the motor only relies on the general internal airflow of the whole machine to remove a small amount of heat. There is no directional and controllable dedicated cooling airflow. Excessive temperature rise of the shaft extension bearing can easily lead to high-temperature aging of lubricating grease, accelerated bearing wear, and seizure failure, which significantly reduces the operating stability and service life of the high-voltage motor.

[0003] Furthermore, existing motor airflow systems are all fixed structures with a fixed airflow distribution ratio, making it impossible to adaptively adjust according to the motor's real-time operating temperature rise. In the national standard motor temperature rise assessment system, the winding temperature rise has a larger margin than the bearing temperature rise. Even when the winding temperature is within acceptable limits but the bearing temperature is high, the airflow is still evenly distributed, and the allocation of heat dissipation resources cannot be adjusted. When the bearing temperature is overheated, the cooling airflow cannot be actively supplemented, resulting in extremely poor heat dissipation targeting and flexibility, making it unsuitable for the complex operating conditions of high-voltage motors with varying loads and temperature rises. Existing motors also lack integrated intelligent temperature control systems, making it impossible to adaptively adjust the airflow path to achieve directional heat dissipation by monitoring the winding and bearing temperatures in real time, let alone achieve automated and precise control of the airflow. Summary of the Invention

[0004] In order to overcome the shortcomings of existing technologies and solve the technical problems such as the lack of dedicated cooling air paths for existing motor bearings and the inability to adaptively adjust according to real-time operating temperature rise, this invention provides a motor with an adaptively adjustable internal circulation air path.

[0005] The present invention is achieved through the following technical solutions.

[0006] This invention provides a motor for adaptively adjusting the internal circulation airflow path, comprising: A base, which is connected to the shaft extension end cover and the non-shaft extension end cover respectively. Several shaft extension end ventilation ports and non-shaft extension end ventilation ports are evenly distributed in the inner cavity of the shaft extension end side and the non-shaft extension end side of the base respectively. The web plate shaft is fixed in the middle of the machine base cavity by bearings at the shaft extension end and bearings at the non-shaft extension end. An axial ventilation channel is formed between the web plates of the web plate shaft. A cast aluminum rotor, wherein the cast aluminum rotor is rotatably mounted on a web shaft; A wound stator core is fixedly sleeved on the outside of a cast aluminum rotor, and an air gap is provided between the wound stator core and the cast aluminum rotor. A centrifugal fan, wherein the centrifugal fan is sleeved on the shaft of the flange and located on the non-shaft extension side; A junction box is located outside the ventilation opening at the shaft extension end on one side of the top of the machine base; A heat dissipation assembly is disposed on the shaft extension end bearing, and the heat dissipation assembly is used to dissipate heat from the shaft extension end bearing; An airflow adjustment assembly is located inside the ventilation opening at the shaft extension end on one side of the top of the machine base. The airflow adjustment assembly is used to adjust the airflow. A flow guiding component, which is sleeved on the shaft of the heat dissipation component and located on one side of the heat dissipation component; A temperature acquisition component is mounted on the shaft extension end bearing and the winding stator core. The control system is located inside the junction box and is electrically connected to the airflow adjustment component and the temperature acquisition component. The control system adjusts the airflow adjustment component by calculating the adaptive adjustment coefficient S, temperature rise, and temperature rise rate based on the temperature acquired by the temperature acquisition component.

[0007] Furthermore, the heat dissipation assembly includes a first annular heat dissipation disk and a second annular heat dissipation disk sleeved on the outside of the shaft extension end bearing. The first annular heat dissipation disk is far away from the flow guiding assembly, and the second annular heat dissipation disk has a plurality of fan-shaped holes evenly distributed on it.

[0008] Furthermore, the diameter of the first annular heat sink is larger than the diameter of the second annular heat sink.

[0009] Furthermore, the airflow adjustment component includes: The mounting frame has an opening in the middle and is located inside the ventilation opening at the shaft extension end on one side of the top of the base. A rotating shaft is rotatably located in the middle of the mounting frame; Limiters, wherein the limiters are located at both ends of the rotating shaft; The driver is located at one end of the rotating shaft outside the limiter, and is wired to the control system via a cable interface thereon. Adjusting blades, which are located on the rotating shaft.

[0010] Furthermore, the driver includes one of a micro motor, a micro servo motor, a micro open-loop stepper motor, and a micro closed-loop stepper motor.

[0011] Furthermore, the flow guiding component has a flow guiding ventilation hole at its center, and the flow guiding component has a concave arc-shaped flow guiding surface on the side facing the heat dissipation component.

[0012] Furthermore, the airflow path includes a first airflow path and a second airflow path. The first airflow path involves adjusting the blades to rotate to the bearing side of the shaft extension end. The internal circulating air is blown by the centrifugal fan along the ventilation channel inside the machine base, through the opening of the mounting frame, towards the winding stator core, and then enters the air gap and axial ventilation channel to achieve circulation. The second airflow path involves adjusting the blades to rotate to the side of the winding stator core. The internal circulating air is blown by the centrifugal fan along the ventilation channel inside the machine base, through the opening of the mounting frame, towards the heat dissipation assembly and the shaft extension end bearing, and then enters the air gap and axial ventilation channel along the guide assembly to achieve circulation.

[0013] Furthermore, the step of adjusting the airflow regulation component in the control system is as follows: S1, the temperature acquisition component acquires the temperatures T of the shaft extension end bearing and the wound stator core, respectively. bf and T w T bf Temperature of the bearing at the shaft extension end, in °C; T w The temperature of the winding stator core is ℃; S2. Calculate the temperature rise, temperature rise rate, adaptive adjustment coefficient S, and S threshold at the shaft extension bearing and the stator core with windings. The maximum temperature rise alarm value of the shaft extension end bearing and the maximum temperature rise alarm value of the winding stator core are selected according to national standards; the S threshold is an adaptive adjustment coefficient S for the temperature rise of the shaft extension end bearing to the limit value. S3. If the adaptive adjustment coefficient S value is greater than the S threshold, then determine whether the first judgment level, the second judgment level, the third judgment level and the fourth judgment level are valid. If the first judgment level is valid, the control system adjusts the air path adjustment component to make the first air path run. If the second judgment level and the third judgment level are valid, the control system adjusts the air path adjustment component to make the second air path run. If the fourth judgment level is valid, the control system adjusts the air path adjustment component to make the first air path run. S4. If the adaptive adjustment coefficient S value is less than the S threshold, the control system adjusts the air path adjustment component to make the first air path and the second air path operate alternately.

[0014] Furthermore, the temperature rise in step S2 is calculated based on the ambient temperature, and the temperature rise rate at the stator core of the winding is... , Let m be the temperature at the winding stator core at time m, in °C. Let be the temperature at time n of the wound stator core, in °C. For mn, s; the temperature rise rate of the bearing at the shaft extension end. , Let be the temperature of the bearing at the shaft extension end at time m, in °C; Let be the temperature of the bearing at the shaft extension end at time n, in °C. Let mn and s be the values ​​of mn and s.

[0015] Furthermore, the first judgment level is that the temperature of the wound stator core exceeds the temperature threshold of the wound stator core; the second judgment level is that the temperatures of both the shaft extension bearing and the wound stator core do not exceed the temperature thresholds of the shaft extension bearing and the wound stator core, but the temperature rise rate of the shaft extension bearing is greater than the temperature rise rate of the wound stator core; the third judgment level is that the temperature of the wound stator core does not exceed the temperature threshold at the wound stator core, but the temperature of the shaft extension bearing exceeds the temperature threshold of the shaft extension bearing; the fourth judgment level is that the temperatures of both the shaft extension bearing and the wound stator core do not exceed the temperature thresholds of the shaft extension bearing and the wound stator core, but the temperature rise rate of the wound stator core is greater than the temperature rise rate of the shaft extension bearing.

[0016] The beneficial effects achieved by this invention are: 1. This invention selects a heat dissipation component to improve the heat dissipation efficiency of the shaft extension bearing. Combined with the second air path, it enables the bearing to cool down quickly, solves the problem of overheating of the shaft extension bearing, reduces the incidence of failures such as high temperature aging of lubricating grease, accelerated bearing wear, and seizure failure of the shaft extension bearing, and effectively extends the service life of the shaft extension bearing and the motor. 2. This invention uses an airflow adjustment component. The adjustment blades in the airflow adjustment component can achieve stepless adjustment of ±90°. By adjusting the direction of the adjustment blades in the airflow adjustment component to either the side of the stator core with windings or the side of the bearing at the extension end of the steering shaft, the airflow can be dynamically controlled, avoiding the waste of airflow in a fixed airflow. Under light load and low temperature conditions, the airflow distribution is optimized and the wind wear loss is reduced. Under heavy load and high temperature conditions, the bearing heat dissipation is strengthened, thereby improving the overall heat dissipation efficiency and operating energy efficiency of the motor. 3. The present invention selects a control system. The control system uses the real-time temperature collected by the temperature acquisition component to calculate the adaptive coefficient S, temperature rise, and temperature rise rate, thereby controlling the regulating blades of the air path regulating component. This enables the motor temperature rise status to be monitored, controlled, and remotely linked, improving the intelligent operation and maintenance level of high-voltage motors and adapting to the complex operating conditions such as industrial and explosion-proof applications.

[0017] Compared with the prior art, the present invention has the advantages of having a dedicated cooling air path for the shaft extension bearing, improving the heat dissipation efficiency and life of the motor, adaptive adjustment based on real-time temperature rise, and a high degree of intelligence. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the heat dissipation component of the present invention; Figure 2 This is a cross-sectional view of the heat dissipation component of the present invention; Figure 3 This is a schematic diagram of the airflow regulation component of the present invention; Figure 4 This is a schematic diagram of the installation of the airflow adjustment component of the present invention on the base; Figure 5 This is a schematic diagram of the flow guiding component of the present invention; Figure 6 This is a schematic diagram of the structure of the present invention; Figure 7 This is a schematic diagram of the first airflow path of the present invention; Figure 8 This is a schematic diagram of the second airflow path of the present invention; Figure 9 This is a flowchart of the control system of the present invention.

[0019] In the diagram: 1. Base; 2. Shaft extension end cover; 3. Non-shaft extension end cover; 4. Shaft extension end vent; 5. Non-shaft extension end vent; 6. Spread plate shaft; 7-1. Shaft extension end bearing; 7-2. Non-shaft extension end bearing; 8. Axial ventilation channel; 9. Cast aluminum rotor; 10. Winded stator core; 11. Air gap; 12. Centrifugal fan; 13. Junction box; 14. Air guide assembly; 15. Temperature acquisition assembly; 16. First annular heat sink; 17. Second annular heat sink; 18. Fan-shaped hole; 19. Mounting frame; 20. Rotating shaft; 21. Limiter; 22. Driver; 23. Cable interface; 24. Adjusting blade; 25. Air guide ventilation hole; 26. Concave arc-shaped air guide surface; 27. Ventilation channel inside the base cavity. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] like Figures 1 to 9 As shown, a motor that adaptively adjusts the internal circulation airflow path includes: The base 1 is connected to the shaft extension end cover 2 and the non-shaft extension end cover 3 respectively. Several shaft extension end ventilation ports 4 and non-shaft extension end ventilation ports 5 are evenly distributed in the inner cavity of the shaft extension end side and the non-shaft extension end side of the base 1 respectively. The web plate shaft 6 is fixed in the middle of the inner cavity of the machine base 1 by the shaft extension end bearing 7-1 and the non-shaft extension end bearing 7-2. An axial ventilation channel 8 is formed between the web plates of the web plate shaft 6. A cast aluminum rotor 9 is rotatably mounted on a web shaft 6. A wound stator core 10 is fixedly sleeved on the outside of a cast aluminum rotor 9, and an air gap 11 is provided between the wound stator core 10 and the cast aluminum rotor 9. Centrifugal fan 12, the centrifugal fan 12 is sleeved on the web shaft 6 and located on the non-shaft extension end side; Junction box 13, the junction box 13 is located outside the shaft extension end ventilation port 4 on one side of the top of the base 1; A heat dissipation assembly is provided on the shaft extension end bearing 7-1, and the heat dissipation assembly is used to dissipate heat from the shaft extension end bearing 7-1. The airflow adjustment component is located inside the shaft extension end ventilation port 4 on one side of the top of the base 1. The airflow adjustment component is used to adjust the airflow. The flow guiding component 14 is sleeved on the shaft 6 and located on one side of the heat dissipation component; Temperature acquisition component 15 is disposed on the shaft extension end bearing 7-1 and the winding stator core 10. The control system is located inside the junction box 13. The control system is electrically connected to the airflow adjustment component and the temperature acquisition component 15. The control system adjusts the airflow adjustment component by calculating the adaptive adjustment coefficient S, temperature rise, and temperature rise rate based on the temperature acquired by the temperature acquisition component 15.

[0022] Specifically, the heat dissipation components improve the heat dissipation efficiency of the shaft extension bearing 7-1, and, in conjunction with the second airflow path, achieve rapid cooling of the shaft extension bearing 7-1, solving the overheating problem and effectively extending the service life of the shaft extension bearing 7-1 and the motor. The airflow path adjustment components enable dynamic control of the airflow path, avoiding the waste of airflow in fixed airflow paths. Under light load and low temperature conditions, airflow distribution is optimized to reduce air wear loss, while under heavy load and high temperature conditions, the heat dissipation of the shaft extension bearing 7-1 is strengthened, improving the overall heat dissipation efficiency and operating energy efficiency of the motor. The airflow guide component 14 serves as an airflow guide. The temperature acquisition component 15 is an NTC thermistor sensor, which has high sensitivity, small size, and fast response speed, better adapting to the motor structure. The control system uses the real-time temperature acquired by the temperature acquisition component 15 to calculate the adaptive coefficient S, temperature rise, and temperature rise rate, thereby adjusting the adjustment blades 24 of the airflow path adjustment component. This enables the motor temperature rise status to be monitored, controlled, and remotely linked, improving the intelligent operation and maintenance level of the high-voltage motor and adapting to the complex operating conditions such as industrial and explosion-proof applications.

[0023] The heat dissipation assembly includes a first annular heat dissipation disk 16 and a second annular heat dissipation disk 17 sleeved on the outside of the shaft extension end bearing 7-1. The diameter of the first annular heat dissipation disk 16 is larger than the diameter of the second annular heat dissipation disk 17. The first annular heat dissipation disk 16 is far away from the flow guiding assembly 14. The second annular heat dissipation disk 17 has a plurality of fan-shaped holes 18 evenly distributed on it.

[0024] Specifically, the fan-shaped hole 18 facilitates air circulation, improves heat dissipation efficiency, and enables the bearing 7-1 at the shaft extension end to cool down quickly.

[0025] The airflow regulation component includes: Mounting frame 19, which has an opening in the middle, is located inside the shaft extension end ventilation port 4 on one side of the top of the base 1. A rotating shaft 20 is rotatably located in the middle of the mounting frame 19; Limiter 21, the limiter 21 is provided at both ends of the rotating shaft 20; The driver 22 is located at one end of the rotating shaft 20 outside the limiter 21, and the driver 22 is wired to the control system through the cable interface 23 provided thereon; Adjusting blade 24, which is disposed on rotating shaft 20.

[0026] Specifically, the mounting frame 19 is fixed to the inside of the shaft extension end ventilation port 4 on one side of the top of the base 1 by screws. The opening of the mounting frame 19 facilitates the provision of an air passage when the adjusting blade 24 rotates. The limiter 21 can limit the rotation angle of the rotating shaft 20 to improve stability. The adjusting blade 24 is mounted on the rotating shaft 20 and can rotate with the rotating shaft 20. The adjusting blade 24 can turn to the side with the winding stator core 10 or the side with the shaft extension end bearing 7-1 to adjust the air passage.

[0027] The driver 22 includes one of a micro motor, a micro servo motor, a micro open-loop stepper motor, and a micro closed-loop stepper motor.

[0028] Specifically, the driver 22 needs to be resistant to high temperature and have good shielding performance. The micro motor has angle control and the micro closed-loop stepper motor needs to have a built-in encoder. The micro motor, micro servo motor, micro open-loop stepper motor and micro closed-loop stepper motor are selected because they are small in size and better adapted to the motor.

[0029] The flow guiding component 14 has a flow guiding ventilation hole 25 at its center, and the flow guiding component 14 has a concave arc-shaped flow guiding surface 26 on the side facing the heat dissipation component.

[0030] Specifically, the airflow guiding vent 25 facilitates the flow of air blown to the shaft extension end bearing 7-1 into the air gap 11 and the axial ventilation channel 8. The concave arc-shaped airflow guiding surface 26 facilitates the airflow to the shaft extension end bearing 7-1.

[0031] The airflow path includes a first airflow path and a second airflow path. In the first airflow path, the adjusting blade 24 rotates to the side of the shaft extension end bearing 7-1. The internal circulating air is blown by the centrifugal fan 12 along the ventilation channel 27 inside the machine base cavity, through the opening of the mounting frame 19, towards the winding stator core 10, and then enters the air gap 11 and the axial ventilation channel 8 to achieve circulation. In the second airflow path, the adjusting blade 24 rotates to the side of the winding stator core 10. The internal circulating air is blown by the centrifugal fan 12 along the ventilation channel 27 inside the machine base cavity, through the opening of the mounting frame 19, towards the heat dissipation assembly and the shaft extension end bearing 7-1, and then enters the air gap 11 and the axial ventilation channel 8 along the guide assembly 14 to achieve circulation.

[0032] Specifically, the air from the first air path can rapidly cool the winding stator core 10, and the air from the second air path can rapidly cool the shaft extension end bearing 7-1, thus achieving controllable air path.

[0033] The steps for adjusting the airflow regulation component in the control system are as follows: S1 and temperature acquisition component 15 respectively acquire the temperature T of the shaft extension end bearing 7-1 and the wound stator core 10. bf and T w T bf Temperature at bearing 7-1 at the shaft extension end, in °C; T w The temperature of the winding stator core 10 is ℃.

[0034] S2. Calculate the temperature rise, temperature rise rate, adaptive adjustment coefficient S, and S threshold for the shaft extension bearing 7-1 and the wound stator core 10. The temperature rise is calculated based on the ambient temperature. The temperature rise rate of the wound stator core 10 is... , Let m be the temperature of the wound stator core 10 at time m, in °C. Let be the temperature of the wound stator core 10 at time n, in °C. For mn, s; the temperature rise rate of bearing 7-1 at the shaft extension end. , Let be the temperature of bearing 7-1 at the shaft extension end at time m, in °C. Let be the temperature of bearing 7-1 at the shaft extension end at time n, in °C. For mn, s, The maximum temperature rise alarm values ​​for the shaft extension bearing 7-1 and the winding stator core 10 are selected according to national standards. According to GB755, the temperature rise alarm values ​​are different for different insulation classes. For example, when the motor insulation class is B, the maximum temperature rise alarm value for the winding stator core 10 is 80K; when the motor insulation class is F, the maximum temperature rise alarm value for the winding stator core 10 is 105K; when the motor insulation class is H, the maximum temperature rise alarm value for the winding stator core 10 is 125K; and when the motor insulation class is B, the maximum temperature rise alarm value for the shaft extension bearing 7-1 is 50K.

[0035] The S-threshold is an adaptive adjustment coefficient S for the temperature rise of the shaft extension bearing 7-1 reaching its limit. The S-threshold is the adaptive adjustment coefficient S calculated by substituting into the formula when the temperature rise of the shaft extension bearing 7-1 is at its maximum and the temperature rise of the winding stator core 10 is 0. It assumes the maximum allowable value for the shaft extension bearing 7-1 when the temperature rise of the winding stator core 10 is 0, i.e., under different insulation classes. In practice, the temperature rise of the shaft extension bearing 7-1 and the temperature rise of the winding stator core 10 will have specific values, and there is no case where it is 0. Therefore, the S threshold is the minimum value of S that ensures the shaft extension bearing 7-1 does not exceed the alarm value.

[0036] Since GB755 specifies that the temperature rise margin of the winding is greater than that of the bearing in the temperature rise test, when the S value is less than the S threshold, the temperature rise of the bearing 7-1 at the shaft extension end and the temperature rise of the stator core 10 with windings will definitely be less than the test requirements.

[0037] S3. If the adaptive adjustment coefficient S value is greater than the S threshold, then determine whether the first judgment level, the second judgment level, the third judgment level, and the fourth judgment level are valid. If the first judgment level is valid, the control system adjusts the airflow adjustment component to make the first airflow path operate. The first judgment level is that the temperature at the wound stator core 10 exceeds the temperature threshold at the wound stator core 10, prioritizing the insulation of the wound stator core and preventing irreversible core faults. If the second and third judgment levels are valid, the control system adjusts the airflow adjustment component to make the second airflow path operate, ensuring heat dissipation of the shaft extension bearing 7-1. The second judgment level is that the temperatures of the shaft extension bearing 7-1 and the wound stator core 10 do not exceed the temperature thresholds of the shaft extension bearing 7-1 and the wound stator core 10, but the temperature of the shaft extension bearing 7-1 does not exceed the temperature thresholds of the shaft extension bearing 7-1 and the wound stator core 10. The temperature rise rate of bearing 7-1 is greater than the temperature rise rate of the wound stator core 10; the third judgment level is that the temperature of the wound stator core 10 does not exceed the temperature threshold of the wound stator core 10, but the temperature of the shaft extension bearing 7-1 exceeds the temperature threshold of the shaft extension bearing 7-1; if the fourth judgment level is established, the control system adjusts the air path adjustment component to make the first air path operate. The fourth judgment level is that the temperatures of the shaft extension bearing 7-1 and the wound stator core 10 do not exceed the temperature thresholds of the shaft extension bearing 7-1 and the wound stator core 10, but the temperature rise rate of the wound stator core 10 is greater than the temperature rise rate of the shaft extension bearing 7-1. The temperature thresholds of the shaft extension bearing 7-1 and the winding stator core 10 are selected according to national standards or set according to the motor factory requirements.

[0038] S4. If the adaptive adjustment coefficient S value is less than the S threshold, the control system adjusts the air path adjustment component to make the first air path and the second air path operate alternately, thus reducing energy consumption while ensuring basic heat dissipation.

[0039] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, modifications can still be made to the embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A motor that adaptively adjusts the internal circulation airflow path, characterized in that: include: The base (1) is connected to the shaft extension end cover (2) and the non-shaft extension end cover (3) respectively. The inner cavity of the base (1) on the shaft extension end side and the non-shaft extension end side is evenly distributed with a number of shaft extension end ventilation ports (4) and non-shaft extension end ventilation ports (5). The web plate shaft (6) is fixed in the middle of the inner cavity of the machine base (1) by the shaft extension end bearing (7-1) and the non-shaft extension end bearing (7-2). An axial ventilation channel (8) is formed between the web plates of the web plate shaft (6). A cast aluminum rotor (9) is rotatably mounted on a web shaft (6); A winding stator core (10) is fixedly sleeved on the outside of a cast aluminum rotor (9), and an air gap (11) is provided between the winding stator core (10) and the cast aluminum rotor (9). Centrifugal fan (12), the centrifugal fan (12) is sleeved on the web shaft (6) and located on the non-shaft extension side; Junction box (13), the junction box (13) is located outside the shaft extension end ventilation port (4) on one side of the top of the base (1); A heat dissipation assembly is provided on the shaft extension end bearing (7-1) and is used to dissipate heat from the shaft extension end bearing (7-1). The air path adjustment component is located inside the shaft extension end ventilation port (4) on one side of the top of the base (1). The air path adjustment component is used to adjust the air path. A flow guiding component (14) is sleeved on the shaft (6) and located on one side of the heat dissipation component; Temperature acquisition component (15), the temperature acquisition component (15) is disposed on the shaft extension end bearing (7-1) and the winding stator core (10); The control system is located inside the junction box (13). The control system is electrically connected to the air path adjustment component and the temperature acquisition component (15). The control system adjusts the air path adjustment component by calculating the adaptive adjustment coefficient S, temperature rise, and temperature rise rate based on the temperature acquired by the temperature acquisition component (15).

2. The motor for adaptive adjustment of the internal circulation airflow according to claim 1, characterized in that: The heat dissipation assembly includes a first annular heat dissipation disk (16) and a second annular heat dissipation disk (17) sleeved on the outside of the shaft extension end bearing (7-1). The first annular heat dissipation disk (16) is far away from the flow guiding assembly (14), and the second annular heat dissipation disk (17) has a number of fan-shaped holes (18) evenly distributed on it.

3. The motor for adaptively adjusting the internal circulation airflow according to claim 2, characterized in that: The diameter of the first annular heat sink (16) is larger than the diameter of the second annular heat sink (17).

4. The motor for adaptive adjustment of the internal circulation airflow according to claim 1, characterized in that: The airflow regulation component includes: Mounting frame (19), the mounting frame (19) has an opening in the middle, and the mounting frame (19) is located inside the shaft extension end ventilation port (4) on one side of the top of the base (1); A rotating shaft (20) is rotatably located in the middle of the mounting frame (19); Limiters (21) are located at both ends of the rotating shaft (20); The driver (22) is located at one end of the rotating shaft (20) outside the limiter (21), and the driver (22) is wired to the control system through the cable interface (23) provided thereon; Adjusting blade (24), which is located on the rotating shaft (20).

5. The motor for adaptive adjustment of the internal circulation airflow according to claim 4, characterized in that: The driver (22) includes one of a micro motor, a micro servo motor, a micro open-loop stepper motor, and a micro closed-loop stepper motor.

6. The motor for adaptively adjusting the internal circulation airflow according to claim 1, characterized in that: The flow guiding component (14) has a flow guiding ventilation hole (25) at its center, and the flow guiding component (14) has a concave arc-shaped flow guiding surface (26) on the side facing the heat dissipation component.

7. The motor for adaptively adjusting the internal circulation airflow according to claim 4, characterized in that: The air path includes a first air path and a second air path. The first air path is achieved by adjusting the blade (24) to rotate to the side of the shaft extension end bearing (7-1). The internal circulating air is blown by the centrifugal fan (12) along the ventilation channel (27) of the machine base cavity through the opening of the mounting frame (19) to the winding stator core (10) and then enters the air gap (11) and the axial ventilation channel (8) to achieve circulation. The second air path is achieved by adjusting the blade (24) to rotate to the side of the winding stator core (10). The internal circulating air is blown by the centrifugal fan (12) along the ventilation channel (27) of the machine base cavity through the opening of the mounting frame (19) to the heat dissipation assembly and the shaft extension end bearing (7-1) and then enters the air gap (11) and the axial ventilation channel (8) along the guide assembly (14) to achieve circulation.

8. The motor for adaptive adjustment of the internal circulation air path according to claim 7, characterized in that: The steps for adjusting the airflow regulation component in the control system are as follows: S1, temperature acquisition component (15) acquires the temperature T at the shaft extension end bearing (7-1) and the winding stator core (10) respectively. bf and T w T bf Temperature of the bearing (7-1) at the shaft extension end, in °C; T w The temperature of the winding stator core (10) is ℃; S2, calculate the temperature rise, temperature rise rate, adaptive adjustment coefficient S and S threshold at the shaft extension end bearing (7-1) and the winding stator core (10), The maximum temperature rise alarm value of the shaft extension end bearing (7-1) and the maximum temperature rise alarm value of the winding stator core (10) are selected according to national standards; the S threshold is the adaptive adjustment coefficient S of the shaft extension end bearing (7-1) when the temperature rise is the limit value. S3. If the adaptive adjustment coefficient S value is greater than the S threshold, then determine whether the first judgment level, the second judgment level, the third judgment level and the fourth judgment level are valid. If the first judgment level is valid, the control system adjusts the air path adjustment component to make the first air path run. If the second judgment level and the third judgment level are valid, the control system adjusts the air path adjustment component to make the second air path run. If the fourth judgment level is met, the control system adjusts the air path adjustment component to make the first air path operate; S4. If the adaptive adjustment coefficient S value is less than the S threshold, the control system adjusts the air path adjustment component to make the first air path and the second air path operate alternately.

9. A motor for adaptively adjusting the internal circulation airflow path according to claim 8, characterized in that: The temperature rise in step S2 is calculated based on the ambient temperature, and the temperature rise rate of the winding stator core (10) is... , Let m be the temperature of the wound stator core (10) at time m, in °C. Let be the temperature of the wound stator core (10) at time n, in °C; For mn, s; the temperature rise rate of the shaft extension end bearing (7-1). , Let be the temperature of the bearing (7-1) at the shaft extension end at time m, in °C; Let be the temperature of the bearing (7-1) at the shaft extension end at time n, in °C; Let mn and s be the values ​​of mn and s.

10. A motor for adaptively adjusting the internal circulation airflow according to claim 8, characterized in that: The first judgment level is when the temperature at the wound stator core (10) exceeds the temperature threshold of the wound stator core (10); the second judgment level is when the temperatures of both the shaft extension bearing (7-1) and the wound stator core (10) do not exceed the temperature thresholds of the shaft extension bearing (7-1) and the wound stator core (10), but the temperature rise rate of the shaft extension bearing (7-1) is greater than the temperature rise rate of the wound stator core (10); the third judgment level is when the temperature at the wound stator core (10) exceeds the temperature threshold of the shaft extension bearing (7-1). The temperature of (10) does not exceed the temperature threshold of the winding stator core (10), but the temperature of the shaft extension bearing (7-1) exceeds the temperature threshold of the shaft extension bearing (7-1); the fourth judgment level is that the temperatures of the shaft extension bearing (7-1) and the winding stator core (10) do not exceed the temperature thresholds of the shaft extension bearing (7-1) and the winding stator core (10), but the temperature rise rate of the winding stator core (10) is greater than the temperature rise rate of the shaft extension bearing (7-1).

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