A corona-proof insulation type permanent magnet motor

Abstract

This invention discloses an anti-corona insulated permanent magnet motor, relating to the field of permanent magnet motor technology. It utilizes the motor's temperature rise to drive the expansion of a thermal expansion medium, and through a telescopic component, sliding rod, and adjusting ring, moves an adjusting block, allowing the adjusting port to automatically change its flow area according to temperature variations. When the airflow is low, a relatively concentrated airflow is formed, increasing the airflow distance; when the airflow increases, ventilation resistance is reduced, improving the overall ventilation capacity of the heat dissipation duct. When the motor speed decreases and the fan's airflow capacity weakens due to a sudden increase in load, but the heat generation remains high, the liquid cooling circuit can be automatically activated based on the temperature rise, allowing air cooling and liquid cooling to work together, avoiding reliance solely on shaft speed for heat dissipation. The coolant flows sequentially through the front cooling ring, cooling channel, and rear cooling ring, absorbing heat from the front, outer periphery, and rear end regions of the stator assembly, respectively. Combined with the external heat dissipation duct of the housing, this forms a cooling path that integrates internal and external cooling, and end and outer periphery cooling.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor technology, specifically a corona-resistant insulated permanent magnet motor. Background Technology

[0002] Corona-resistant insulated permanent magnet motors are motors that use permanent magnets to establish a rotor magnetic field and generate a rotating magnetic field through stator windings to achieve power output. They can be used in industrial equipment such as mining conveyors, fans, and water pumps. By using corona-resistant insulation materials and setting voltage equalization or semi-conductive structures at the edges of winding conductors and insulation interfaces, they reduce local electric field concentration and reduce the erosion of the insulation layer by corona discharge, thereby improving the insulation reliability of the motor during long-term operation.

[0003] In mining material conveying operations, materials such as ore and coal gangue often experience sudden load changes on conveying equipment due to differences in particle size, uneven distribution, or localized accumulation. This can cause the drive motor to experience a rapid decrease in speed, an increase in current, and a rise in heat generation. Existing motors often rely on fans that rotate synchronously with the shaft for cooling. However, when the motor speed decreases due to a sudden increase in load, the cooling airflow from the fan also decreases. This can easily lead to an unfavorable situation where the motor's heat demand increases while its cooling capacity decreases, making it difficult to dissipate the heat accumulated in the stator assembly and casing in a timely manner. This results in excessively rapid localized temperature rises, affecting the motor's continuous and stable operation under conditions of large load fluctuations, such as in mining material conveying. Summary of the Invention

[0004] The purpose of this invention is to provide a corona-resistant insulated permanent magnet motor to solve the problem of insufficient heat dissipation of motors under low speed and high load in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a corona-resistant insulated permanent magnet motor, comprising a housing and a self-adjusting cooling assembly, a stator assembly installed inside the housing, a rotating shaft rotatably mounted inside the housing, and a rotor assembly mounted on the rotating shaft; The self-regulating cooling assembly includes a front cooling ring, a rear cooling ring, a cooling channel, a fan, and a conversion adjustment unit. Both the front and rear cooling rings are installed inside the housing and are located at both ends of the stator assembly. The cooling channel is located inside the housing, with one end connected to the front cooling ring and the other end connected to the rear cooling ring. The front cooling ring is connected to the liquid cooling device via a pipe. Several expansion chambers are provided inside the housing, and the conversion adjustment unit is slidably installed in the expansion chambers. The expansion chambers are equipped with telescopic components, which are slidably connected to the rear cooling ring. The conversion adjustment unit is connected to the liquid cooling device via a pipe, and the fan is installed at one end of the shaft.

[0006] The permanent magnet motor is connected to an external control cabinet, which contains a control system that can operate the entire motor. The liquid cooling device inputs coolant into the forward cooling chamber through pipes, and the liquid discharged from the outlet flows back to the liquid cooling device through pipes. The liquid cooling device cools the returning coolant and recycles it.

[0007] The expansion chamber contains a thermal expansion medium. When heated, the thermal expansion medium causes the expansion member to extend. The expansion member can be a metal bellows.

[0008] After the motor is powered on, the stator assembly and rotor assembly interact. The rotor assembly drives the shaft to rotate, and the shaft synchronously drives the fan to rotate. External air enters through the air intake at the rear of the casing. The fan carries the airflow to the periphery. After being guided by the rear casing and the guide plate, the peripheral airflow enters the heat dissipation duct through the regulating port and flows along the surface of the heat-conducting ribs, thereby carrying away the heat transferred from the casing and achieving air cooling of the stator assembly.

[0009] Furthermore, the conversion adjustment unit includes an adjustment ring, on which several connecting rods are mounted, and on the connecting rods are slide rods. The slide rods are slidably installed in the expansion chamber, and an elastic element is installed between the slide rods and the expansion chamber. A detector is installed in the uppermost slide rod, and an adaptive starter is installed on the lowermost slide rod. The adaptive starter is connected to the rear cooling ring, and the adaptive starter is connected to the liquid cooling device through a pipe.

[0010] The elastic element can be a spring. The detector can be a displacement sensor.

[0011] When the motor temperature is low, the regulating blocks are in their initial position, and the flow area of ​​the regulating port is small. Airflow through the relatively small regulating port forms a more concentrated flow, allowing the limited air volume to be delivered further along the cooling duct, thus expanding the effective range of airflow on the casing surface. As the motor speed and load increase, the heat generated by the stator assembly gradually increases. This heat is transferred to the expansion chamber, causing the thermal expansion medium within to expand, which in turn pushes the telescopic component to extend. The telescopic component pushes the sliding rod to move, which in turn drives the regulating ring to move via a connecting rod, simultaneously compressing the elastic component. As the regulating ring moves, several regulating blocks move synchronously along the cooling duct. Because the regulating blocks have inclined surfaces, the cross-sectional area occupied by the regulating blocks within the cooling duct gradually decreases, causing the flow area of ​​the regulating port to gradually increase with the temperature rise.

[0012] When the motor speed increases and the air volume generated by the fan increases, the enlarged adjustment port can reduce the resistance when the airflow enters the heat dissipation duct, allowing a larger air volume to pass through the heat dissipation duct in a timely manner, thereby achieving the purpose of automatically adjusting the air cooling effect according to the motor temperature rise.

[0013] Furthermore, the adaptive starter includes a transmission rod and a strip-shaped housing. A piston rod is mounted on the transmission rod, and the strip-shaped housing is mounted on the liquid outlet pipe at the bottom of the rear cooling ring. The strip-shaped housing has a liquid outlet, which is connected to the liquid cooling device through a pipe. One end of the piston rod is equipped with a liquid inlet, and the liquid inlet has an L-shaped liquid inlet channel. The piston rod is slidably connected to the liquid outlet pipe.

[0014] The outlet pipe is made of rigid material.

[0015] Furthermore, the casing is provided with several heat-conducting ribs, and the heat-conducting ribs form a heat dissipation airflow channel.

[0016] Furthermore, a number of adjustment blocks are provided on one side of the adjustment ring, and a guide plate is provided on the other side of the adjustment ring. The adjustment blocks extend into the heat dissipation air duct, and an adjustment port is formed between the adjustment blocks and the heat dissipation air duct. The adjustment blocks are provided with inclined surfaces.

[0017] When the motor drives the ore conveying equipment and the ore raw materials are relatively evenly distributed, the load on the motor changes relatively slowly. The self-regulating cooling component continuously adjusts the regulating port according to the temperature rise, so that the air cooling capacity is adapted to the current heating state of the motor.

[0018] When ore raw materials accumulate in concentrated areas, the motor load suddenly increases, and the speed decreases accordingly, while the heat generated by the stator assembly remains significant. Due to the reduced shaft speed, the cooling airflow from the fan decreases simultaneously, making it difficult to dissipate heat effectively using only air cooling. At this point, the motor temperature continues to rise, and the thermal expansion medium further expands, causing the slide bar and adjusting ring to continue moving. The adjusting opening is expanded to a larger degree to minimize the resistance to airflow. As the slide bar continues to move, the detector moves towards the end plate. The detector's sensing end is pressed by the end plate, generating a corresponding displacement signal, which is sent to the control system. This displacement signal increases with the degree of expansion of the thermal expansion medium, thus reflecting the motor's temperature rise.

[0019] At the same time, the slide rod drives the piston rod and the liquid inlet end to move via the transmission rod. When the liquid inlet end enters the coverage area of ​​the strip shell, the vertical section of the L-shaped liquid inlet channel connects with the inside of the strip shell, thereby opening up the return path of the rear cooling ring.

[0020] Furthermore, the housing is provided with an inner end shell, and an end plate is provided on the inner end shell, with the detection end of the detector abutting against the end plate.

[0021] When the displacement signal output by the detector reaches a preset critical value, the corresponding return path is simultaneously opened, and the control system activates the liquid cooling device. After entering the front cooling ring, the coolant first cools the front area of ​​the stator assembly, then enters the cooling channel and flows along the outer periphery of the stator assembly to cool the outer side of the stator assembly; after reaching the rear cooling ring, the coolant cools the rear area of ​​the stator assembly. The coolant, after absorbing heat, then enters the strip shell through the L-shaped inlet channel and flows back to the liquid cooling device through the outlet, where it is cooled and re-enters the circulation.

[0022] After liquid cooling starts, the fan continues to generate cooling airflow, and the regulating port maintains a large flow area, so air cooling and liquid cooling can work simultaneously. Air cooling mainly removes heat from the casing and the surface of the heat-conducting fins, while liquid cooling further absorbs heat from both ends and the outer peripheral area of ​​the stator assembly to improve the problem of insufficient heat dissipation under low speed and high load conditions of the motor.

[0023] During liquid cooling, the control system adjusts the liquid cooling device based on the displacement signal from the detector. When the displacement signal continues to increase, it indicates that the motor temperature is still rising, and the control system increases the circulation speed and cooling intensity of the coolant; when the displacement signal gradually weakens, it indicates that the motor temperature is beginning to decrease, and the control system correspondingly reduces the operating intensity of the liquid cooling device.

[0024] The strip-shaped shell extends along the moving direction of the liquid inlet end, so that the L-shaped liquid inlet channel can be kept connected to the strip-shaped shell within a certain range of movement. This ensures that the liquid cooling circuit remains open when the motor temperature changes within a certain range, avoiding frequent on / off switching of the liquid cooling circuit due to small displacement of the liquid inlet end, and reserving a corresponding stroke range for adjusting the liquid cooling intensity.

[0025] As the motor load decreases and the stator assembly temperature gradually drops, the thermally expanding medium contracts, weakening the pushing force of the telescopic component on the slide rod. The elastic component then pushes the slide rod to move in the opposite direction. The slide rod, through the connecting rod, drives the adjusting ring to reset, causing the adjusting block to gradually return to its initial position, and the adjusting port to return to its basic flow area.

[0026] When the slide bar resets, it also drives the piston rod and the liquid inlet end to move in the opposite direction via the transmission rod. When the vertical section of the L-shaped liquid inlet channel moves out of the coverage area of ​​the strip shell, the liquid cooling return path is disconnected, the displacement signal of the detector drops synchronously to below the critical value, the control system stops the operation of the liquid cooling device, and the motor returns to the cooling state mainly based on air cooling.

[0027] Furthermore, the cooling channel has a spiral structure, with a front cooling chamber inside the front cooling ring. The front cooling chamber is connected to the cooling channel and is connected to the liquid cooling device through a pipe.

[0028] Furthermore, a rear cooling cavity is provided within the rear cooling ring, and the rear cooling cavity is connected to the cooling channel.

[0029] Compared with the prior art, the beneficial effects of the present invention are: 1. The expansion of the thermal expansion medium is driven by the temperature rise of the motor, and the adjustment block is moved by the telescopic component, slide rod and adjustment ring, so that the flow area of ​​the adjustment port can be automatically changed with the temperature. When the air volume is small, a relatively concentrated airflow is formed to increase the airflow distance. When the air volume increases, the ventilation resistance is reduced, the overall ventilation capacity of the heat dissipation air duct is improved, and the purpose of adaptive air cooling is achieved.

[0030] 2. When the motor speed decreases and the fan's airflow capacity weakens due to a sudden increase in load, but the heat generation is still large, the liquid cooling circuit can be automatically activated according to the temperature rise status, so that air cooling and liquid cooling work together, avoiding relying solely on the shaft speed for heat dissipation, and improving the cooling effect of the motor under sudden load conditions.

[0031] 3. The coolant flows sequentially through the front cooling ring, cooling channel and rear cooling ring, which can absorb the heat of the front, outer periphery and rear of the stator assembly respectively. Together with the heat dissipation air duct outside the housing, it forms a cooling path that combines the inside and outside and the end and the outer periphery, reducing local heat concentration.

[0032] 4. The detector can reflect the degree of motor temperature rise based on the displacement of the slide bar, and the control system adjusts the circulation speed and cooling intensity of the liquid cooling device accordingly; the strip shell extends along the direction of movement of the liquid inlet end, so that the liquid cooling circuit remains connected within a certain stroke range, thereby reducing the frequent on / off switching caused by small displacements near the critical temperature, and reserving space for continuous adjustment of liquid cooling intensity.

[0033] 5. During the temperature rise, the regulating ring gradually expands the regulating port to continuously enhance the air cooling capacity. When the temperature rise further increases and reaches the set value, the slide bar synchronously drives the liquid inlet end into the connecting section of the strip shell and triggers the operation of the liquid cooling device, so that the cooling method naturally transitions from single air cooling to air cooling and water cooling working together, avoiding sudden interruption or delayed switching of the cooling effect, and allowing the heat dissipation of the motor to be well connected between different heat generation stages. Attached Figure Description

[0034] Figure 1 This is a cross-section of the motor of the present invention. Figure 1 ; Figure 2 This is a cross-section of the motor of the present invention. Figure 2 ; Figure 3 This is a cross-sectional view of the front cooling ring, cooling channel, and rear cooling ring of the present invention; Figure 4 This is a perspective view of the conversion adjustment unit of the present invention; Figure 5 This is a perspective view of the adaptive starter of the present invention; Figure 6 This is a perspective view of the detector of the present invention; Figure 7 This is a cross-sectional view of the housing of the present invention; Figure 8 For the present invention Figure 2 A magnified view of a portion of region A in the middle; Figure 9 For the present invention Figure 3 A magnified view of a portion of region B in the middle; Figure 10 For the present invention Figure 7 A magnified view of a portion of region C.

[0035] In the diagram: 1. Housing; 2. Stator assembly; 3. Shaft; 4. Rotor assembly; 5. Front cooling ring; 6. Cooling channel; 7. Rear cooling ring; 8. Conversion and adjustment unit; 9. Expansion chamber; 10. Fan; 11. Heat-conducting rib; 12. Inner end shell; 13. End plate; 51. Front cooling chamber; 71. Rear cooling chamber; 81. Adjusting ring; 82. Connecting rod; 83. Slide rod; 84. Elastic element; 85. Detector; 86. Adaptive starter; 861. Transmission rod; 862. Piston rod; 863. Strip shell; 864. Liquid outlet; 865. Liquid inlet end; 866. L-shaped liquid inlet channel; 811. Adjusting block; 812. Guide plate; 813. Inclined surface; 814. Adjustment port; 91. Telescopic component. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] like Figures 1-4 and Figures 6-10 The first embodiment of the present invention shown is a corona-resistant insulated permanent magnet motor, which includes a housing 1 and a self-adjusting cooling assembly. A stator assembly 2 is installed inside the housing 1, and a rotating shaft 3 is rotatably installed inside the housing 1. A rotor assembly 4 is installed on the rotating shaft 3. The self-adjusting cooling assembly includes a front cooling ring 5, a rear cooling ring 7, a cooling channel 6, a fan 10, and a conversion adjustment unit 8. The front cooling ring 5 and the rear cooling ring 7 are both installed inside the housing 1, located at both ends of the stator assembly 2. The cooling channel 6 is located inside the housing 1, with one end connected to the front cooling ring 5 and the other end connected to the rear cooling ring 7. The front cooling ring 5 is connected to the liquid cooling device through a pipe. The housing 1 has several expansion chambers 9, and the conversion adjustment unit 8 is slidably installed in the expansion chambers 9. The expansion chambers 9 have telescopic components 91, which are slidably connected to the rear cooling ring 7. The conversion adjustment unit 8 is connected to the liquid cooling device through a pipe. The fan 10 is installed at one end of the rotating shaft 3.

[0038] The cooling channel 6 has a spiral structure, and the front cooling ring 5 has a front cooling cavity 51. The front cooling cavity 51 is connected to the cooling channel 6 and is connected to the liquid cooling device through a pipe.

[0039] The rear cooling ring 7 has a rear cooling cavity 71, which is connected to the cooling channel 6.

[0040] The permanent magnet motor is connected to an external control cabinet, which contains a control system that can operate the entire motor. The liquid cooling device inputs coolant into the front cooling chamber 51 through a pipe, and the liquid discharged from the outlet 864 flows back to the liquid cooling device through a pipe. The liquid cooling device cools the returned coolant and recycles it.

[0041] The expansion chamber 9 contains a thermal expansion medium. When the thermal expansion medium is heated, it causes the expansion member 91 to extend. The expansion member 91 can be a metal bellows.

[0042] The conversion adjustment unit 8 includes an adjustment ring 81, on which several connecting rods 82 are mounted. Slide rods 83 are mounted on the connecting rods 82 and slidably installed within the expansion chamber 9. An elastic element 84 is installed between the slide rod 83 and the expansion chamber 9. A detector 85 is located within the uppermost slide rod 83, and an adaptive starter 86 is mounted on the lowermost slide rod 83. The adaptive starter 86 is connected to the rear cooling ring 7 and is connected to a liquid cooling device via a pipe. The elastic element 84 can be a spring. The detector 85 can be a displacement sensor.

[0043] The casing 1 is provided with several heat-conducting ribs 11, and the heat-conducting ribs 11 form a heat dissipation air channel.

[0044] A plurality of adjusting blocks 811 are provided on one side of the adjusting ring 81, and a guide plate 812 is provided on the other side of the adjusting ring 81. The adjusting blocks 811 extend into the heat dissipation air duct, and an adjusting port 814 is formed between the adjusting blocks 811 and the heat dissipation air duct. An inclined surface 813 is provided on the adjusting blocks 811.

[0045] The housing 1 has an inner end shell 12, and an end plate 13 is provided on the inner end shell 12. The detection end of the detector 85 abuts against the end plate 13.

[0046] like Figure 5 The second embodiment of the present invention, shown, provides an adaptive starter 86 different from the first embodiment. It includes a transmission rod 861 and a strip-shaped shell 863. A piston rod 862 is mounted on the transmission rod 861. The strip-shaped shell 863 is mounted on the liquid outlet pipe at the bottom of the rear cooling ring 7. The strip-shaped shell 863 has a liquid outlet 864, which is connected to a liquid cooling device via a pipe. One end of the piston rod 862 has a liquid inlet head 865, and an L-shaped liquid inlet channel 866 is provided inside the liquid inlet head. The piston rod 862 is slidably connected to the liquid outlet pipe. When the motor temperature rises to a set value, the slide rod 83 synchronously drives the liquid inlet head 865 into the communication area of ​​the strip-shaped shell 863, triggering the operation of the liquid cooling device. This allows the cooling method to naturally transition from single air cooling to a combined air and water cooling system, avoiding sudden interruption or delayed switching of the cooling effect, and ensuring good heat dissipation between different heating stages of the motor. The liquid outlet pipe is made of a rigid material.

[0047] When ore raw materials accumulate in a concentrated manner, the motor load suddenly increases, and the speed decreases accordingly, while the heat generated by the stator assembly 2 remains significant. As the rotational speed of the shaft 3 decreases, the cooling airflow generated by the fan 10 also decreases, making it difficult to dissipate heat quickly enough using only air cooling. At this time, the motor temperature continues to rise, and the thermal expansion medium further expands, causing the slide bar 83 and adjusting ring 81 to continue moving. The adjusting port 814 is expanded to a larger opening to minimize the resistance to airflow. As the slide bar 83 continues to move, the detector 85 moves towards the end plate 13. The detection end of the detector 85 generates a corresponding displacement signal after being pressed by the end plate 13, and this signal is sent to the control system. This displacement signal increases with the degree of expansion of the thermal expansion medium, thus reflecting the temperature rise of the motor.

[0048] At the same time, the slide rod 83 drives the piston rod 862 and the liquid inlet end 865 to move via the transmission rod 861. When the liquid inlet end 865 enters the coverage area of ​​the strip shell 863, the vertical section of the L-shaped liquid inlet channel 866 connects with the interior of the strip shell 863, thereby opening the return path of the rear cooling ring 7.

[0049] The working principle of this invention is as follows: After the motor is powered on, the stator assembly 2 and the rotor assembly 4 interact. The rotor assembly 4 drives the rotating shaft 3 to rotate, and the rotating shaft 3 synchronously drives the fan 10 to rotate. External air enters through the air intake at the rear end of the housing 1. The fan 10 carries the airflow to the periphery. After being guided by the rear end shell and the guide plate 812, the peripheral airflow enters the heat dissipation duct through the regulating port 814 and flows along the surface of the heat-conducting rib 11, thereby carrying away the heat transferred from the housing 1 and achieving air cooling of the stator assembly 2.

[0050] When the motor temperature is low, the regulating block 811 is in its initial position, and the flow area of ​​the regulating port 814 is small. The airflow forms a more concentrated flow when passing through the relatively small regulating port 814, allowing the limited air volume to be delivered further along the heat dissipation duct, thus expanding the effective range of the airflow on the surface of the housing 1. As the motor speed and load increase, the heat generated by the stator assembly 2 gradually increases. After the heat is transferred to the expansion chamber 9, the thermal expansion medium inside expands, thereby pushing the telescopic member 91 to extend. The telescopic member 91 pushes the slide rod 83 to move, and the slide rod 83 drives the regulating ring 81 to move via the connecting rod 82, while simultaneously compressing the elastic member 84. When the regulating ring 81 moves, several regulating blocks 811 move synchronously along the heat dissipation duct. Because the regulating blocks 811 are provided with inclined surfaces 813, the cross-sectional area occupied by the regulating blocks 811 within the heat dissipation duct gradually decreases, causing the flow area of ​​the regulating port 814 to gradually increase with the temperature rise.

[0051] When the motor speed increases and the air volume generated by the fan 10 increases, the enlarged adjustment port 814 can reduce the resistance when the airflow enters the heat dissipation duct, so that a larger air volume can pass through the heat dissipation duct in time, thereby achieving the purpose of automatically adjusting the air cooling effect according to the motor temperature rise.

[0052] When the motor drives the ore conveying equipment and the ore raw materials are relatively evenly distributed, the load on the motor changes relatively slowly. The self-regulating cooling component continuously adjusts the regulating port 814 according to the temperature rise, so that the air cooling capacity is adapted to the current heating state of the motor.

[0053] When ore raw materials accumulate in a concentrated manner, the motor load suddenly increases, and the speed decreases accordingly, while the heat generated by the stator assembly 2 remains significant. As the rotational speed of the shaft 3 decreases, the cooling airflow generated by the fan 10 also decreases, making it difficult to dissipate heat quickly enough using only air cooling. At this time, the motor temperature continues to rise, and the thermal expansion medium further expands, causing the slide bar 83 and adjusting ring 81 to continue moving. The adjusting port 814 is expanded to a larger opening to minimize the resistance to airflow. As the slide bar 83 continues to move, the detector 85 moves towards the end plate 13. The detection end of the detector 85 generates a corresponding displacement signal after being pressed by the end plate 13, and this signal is sent to the control system. This displacement signal increases with the degree of expansion of the thermal expansion medium, thus reflecting the temperature rise of the motor.

[0054] At the same time, the slide rod 83 drives the piston rod 862 and the liquid inlet end 865 to move via the transmission rod 861. When the liquid inlet end 865 enters the coverage area of ​​the strip shell 863, the vertical section of the L-shaped liquid inlet channel 866 connects with the interior of the strip shell 863, thereby opening the return path of the rear cooling ring 7.

[0055] When the displacement signal output by detector 85 reaches a preset critical value, the corresponding return path is simultaneously opened, and the control system starts the liquid cooling device. After entering the front cooling ring 5, the coolant first cools the front area of ​​the stator assembly 2, then enters the cooling channel 6 and flows along the outer periphery of the stator assembly 2 to cool the outer side of the stator assembly 2; after reaching the rear cooling ring 7, the coolant cools the rear area of ​​the stator assembly 2. The coolant, after absorbing heat, then enters the strip shell 863 through the L-shaped inlet channel 866, and flows back to the liquid cooling device through the outlet 864, where it is cooled and re-enters the circulation.

[0056] After liquid cooling is started, fan 10 continues to generate cooling airflow, and regulating port 814 also maintains a large flow area, so air cooling and liquid cooling can work simultaneously. Air cooling mainly removes heat from the surface of the casing 1 and heat-conducting ribs 11, while liquid cooling further absorbs heat from both ends and the outer peripheral area of ​​the stator assembly 2 to improve the problem of insufficient heat dissipation of the motor under low speed and high load conditions.

[0057] During the liquid cooling process, the control system adjusts the liquid cooling device based on the displacement signal from detector 85. When the displacement signal continues to increase, it indicates that the motor temperature is still rising, and the control system increases the circulation speed and cooling intensity of the coolant; when the displacement signal gradually weakens, it indicates that the motor temperature is beginning to decrease, and the control system correspondingly reduces the operating intensity of the liquid cooling device.

[0058] The strip-shaped shell 863 extends along the moving direction of the liquid inlet end 865, so that the liquid inlet end 865 can maintain the connection between the L-shaped liquid inlet channel 866 and the strip-shaped shell 863 within a certain range of movement. This ensures that the liquid cooling circuit remains open when the motor temperature changes within a certain range, avoiding frequent on / off switching of the liquid cooling circuit due to small displacement of the liquid inlet end 865, and reserving a corresponding stroke range for liquid cooling intensity adjustment.

[0059] When the motor load decreases and the temperature of the stator assembly 2 gradually drops, the thermal expansion medium contracts, the pushing effect of the telescopic component 91 on the slide rod 83 weakens, and the elastic component 84 pushes the slide rod 83 to move in the opposite direction. The slide rod 83 drives the adjusting ring 81 to reset through the connecting rod 82, so that the adjusting block 811 gradually returns to its initial position, and the adjusting port 814 correspondingly returns to the basic flow area.

[0060] When the slide bar 83 resets, it also drives the piston rod 862 and the liquid inlet end 865 to move in the opposite direction via the transmission rod 861. When the vertical section of the L-shaped liquid inlet channel 866 moves out of the coverage area of ​​the strip shell 863, the liquid cooling return path is disconnected, the displacement signal of the detector 85 decreases synchronously to below the critical value, the control system stops the operation of the liquid cooling device, and the motor returns to the cooling state mainly based on air cooling.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A corona-resistant insulated permanent magnet motor, characterized in that: The motor includes a housing (1) and a self-adjusting cooling assembly. A stator assembly (2) is installed inside the housing (1). A rotating shaft (3) is rotatably installed inside the housing (1). A rotor assembly (4) is installed on the rotating shaft (3). The self-adjusting cooling assembly includes a front cooling ring (5), a rear cooling ring (7), a cooling channel (6), a fan (10), and a conversion adjustment unit (8). The front cooling ring (5) and the rear cooling ring (7) are both installed inside the housing (1). The front cooling ring (5) and the rear cooling ring (7) are located at both ends of the stator assembly (2). The cooling channel (6) is set inside the housing (1). One end of the cooling channel (6) is connected to the front cooling ring (5), and the other end of the cooling channel (6) is connected to the rear cooling ring (7). The front cooling ring (5) is connected to the liquid cooling device through a pipe. The housing (1) is provided with several expansion chambers (9). The conversion adjustment unit (8) is slidably installed in the expansion chambers (9). The expansion chambers (9) are provided with telescopic components (91). The conversion adjustment components are slidably connected to the rear cooling ring (7). The conversion adjustment unit (8) is connected to the liquid cooling device through a pipe. The fan (10) is installed at one end of the rotating shaft (3).

2. The anti-corona insulated permanent magnet motor according to claim 1, characterized in that: The conversion adjustment unit (8) includes an adjustment ring (81), on which several connecting rods (82) are installed. A sliding rod (83) is installed on the connecting rod (82). The sliding rod (83) is slidably installed in the expansion chamber (9). An elastic element (84) is installed between the sliding rod (83) and the expansion chamber (9). A detector (85) is provided in the uppermost sliding rod (83). An adaptive starter (86) is installed on the lowermost sliding rod (83). The adaptive starter (86) is connected to the rear cooling ring (7). The adaptive starter (86) is connected to the liquid cooling device through a pipe.

3. The anti-corona insulated permanent magnet motor according to claim 2, characterized in that: The adaptive starter (86) includes a transmission rod (861) and a strip shell (863). A piston rod (862) is installed on the transmission rod (861). The strip shell (863) is installed on the liquid outlet pipe at the bottom of the rear cooling ring (7). The strip shell (863) is provided with a liquid outlet (864). The liquid outlet (864) is connected to the liquid cooling device through a pipe. One end of the piston rod (862) is provided with a liquid inlet end (865). The liquid inlet end is provided with an L-shaped liquid inlet channel (866). The piston rod (862) is slidably connected to the liquid outlet pipe.

4. The anti-corona insulated permanent magnet motor according to claim 3, characterized in that: The housing (1) is provided with a number of heat-conducting ribs (11), and the heat-conducting ribs (11) form a heat dissipation air duct.

5. A corona-resistant insulated permanent magnet motor according to claim 4, characterized in that: The regulating ring (81) has several regulating blocks (811) on one side and a guide plate (812) on the other side. The regulating blocks (811) extend into the heat dissipation duct, and the regulating blocks (811) and the heat dissipation duct form an regulating port (814). The regulating blocks (811) have inclined surfaces (813).

6. A corona-resistant insulated permanent magnet motor according to claim 3, characterized in that: The housing (1) is provided with an inner end shell (12), and an end plate (13) is provided on the inner end shell (12). The detection end of the detector (85) abuts against the end plate (13).

7. A corona-resistant insulated permanent magnet motor according to any one of claims 1-6, characterized in that: The cooling channel (6) has a spiral structure. The front cooling ring (5) is provided with a front cooling cavity (51). The front cooling cavity (51) is connected to the cooling channel (6). The front cooling cavity (51) is connected to the liquid cooling device through a pipe.

8. A corona-resistant insulated permanent magnet motor according to claim 7, characterized in that: The rear cooling ring (7) is provided with a rear cooling cavity (71), which is connected to the cooling channel (6).

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