A high-speed permanent magnet motor for main mine ventilators based on magnetic levitation technology

Abstract

The present invention discloses a high-speed permanent magnet motor for a mine main ventilator based on magnetic levitation technology, which relates to the technical field of permanent magnet motors and includes a casing, a main shaft passing through the inside of the casing and extending to the outside of the casing, and an intelligent control system. A through groove is formed on the surface of one end of the casing, and a magnetic levitation bearing for fixing the main shaft is fixedly arranged at the inner wall of the through groove. A water cooling mechanism for cooling the magnetic levitation bearing is fixedly arranged on the outer surface of the casing; the intelligent control system includes a data acquisition unit, a balance analysis unit, a balance control unit and a temperature control unit; in the present invention, the existing mechanical bearing is replaced by a magnetic levitation bearing. The magnetic levitation bearing includes a moving ring and a magnet inner ring which are oppositely arranged, and the magnetic polarities of the opposite working surfaces of the moving ring and the magnet inner ring are the same. Under the action of magnetic repulsive force, the moving ring can be in a completely suspended state relative to the magnet inner ring, so that the main shaft and the drill are suspended and supported together, ensuring the high-speed rotation requirement of the main shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet motors, and particularly to a high-speed permanent magnet motor for a mine main ventilator based on magnetic levitation technology. Background Art

[0002] The permanent magnet motors in the prior art are based on the interaction between the rotating magnetic field generated by the stator and the magnetic field generated by the permanent magnets on the rotor. The rotor is equipped with pre-magnetized permanent magnets, which can generate a strong magnetic field during rotation, thereby providing a greater output torque. Its structure consists of a stator, a rotor, and bearings for supporting the rotor shaft (or motor main shaft, rotating shaft, rotating axis, drive shaft), etc. Generally, bearings are required to support the rotor shaft.

[0003] However, when using ordinary bearings to support the rotor shaft, mechanical friction is bound to occur during the operation of the rotor due to mechanical contact. Mechanical friction not only increases the frictional resistance of the rotor, wears the moving parts, generates mechanical vibration and noise, but also causes the components to heat up, deteriorates the performance of the lubricant, and seriously uneven air gap of the motor, winding heating, and increased temperature rise, thus reducing the motor efficiency and shortening the service life of the motor. Especially when applied to mine fans, mine fans are mainly used for ventilation, cooling and dehumidification, explosion-proof smoke exhaust, and their working environment is complex and the working load is large. Therefore, the rotational speed of the permanent magnet motors in the prior art is limited and cannot meet the high-speed requirements. In addition, large friction generates more heat energy, and oil lubrication is also required. Especially, its axial bearing capacity is limited. When the axial force is relatively large, it is difficult for ordinary bearings to operate for a long time and is easily damaged, thus having a short service life. Once the bearing is damaged and not replaced in time, it will affect the heat dissipation and smoke exhaust effects;

[0004] In view of the above technical defects, a solution is proposed. Summary of the Invention

[0005] The purpose of the present invention is to fundamentally avoid the product failure problems caused by the easy failure of ordinary bearings or electromagnetic suspension bearings.

[0006] To achieve the above purpose, the present invention adopts the following technical solution: A high-speed permanent magnet motor for a mine main ventilator based on magnetic levitation technology, including a machine shell, a main shaft passing through the inside of the machine shell and extending to the outside of the machine shell, and an intelligent control system. A plurality of stators are fixedly arranged on the inner wall of the machine shell. A rotor is sleeved on the outer surface of the main shaft. A through groove is formed on one end surface of the machine shell. A magnetic levitation bearing for fixing the main shaft is fixedly arranged on the inner wall of the through groove. A water cooling mechanism for cooling the magnetic levitation bearing is fixedly arranged on the outer surface of the machine shell;

[0007] The intelligent control system includes a data acquisition unit, a balance analysis unit, a balance control unit, and a temperature control unit;

[0008] The data acquisition unit includes a temperature monitoring module and a vibration monitoring module. The temperature monitoring module is used to obtain the operating temperature data of the magnetic levitation bearing through a temperature sensor arranged outside the magnetic levitation bearing and send it to the temperature control unit. The vibration monitoring module is used to obtain the vibration data during the rotation of the main shaft through a vibration sensor arranged outside the main shaft and send it to the balance analysis unit;

[0009] The balance analysis unit is used to obtain and process the vibration data. The vibration data includes vibration amplitude and vibration frequency. It obtains the standard vibration range, judges vibration anomalies based on the real-time vibration data and the standard vibration range, conducts abnormal diagnosis and analysis on the vibration anomalies, and generates an adjustment instruction according to the abnormal diagnosis and analysis and sends it to the balance control unit;

[0010] The balance control unit obtains and processes the adjustment instruction, analyzes and obtains the selected electromagnet and the current to be energized according to the adjustment instruction, controls the selected electromagnet to be connected to the circuit and makes the current flowing through it reach the current to be energized, so as to realize balance adjustment and ensure that the main shaft rotates at a high speed and stably.

[0011] The temperature control unit is used to obtain and process the operating temperature data of the magnetic levitation bearing, calculate the temperature fluctuation coefficient of the magnetic levitation bearing according to the operating temperature data and the standard temperature range, and then calculate the cooling cycle speed of the water cooling mechanism according to the cooling efficiency of the water cooling mechanism, and control the water cooling mechanism to reach the required cooling cycle speed to realize real-time cooling adjustment.

[0012] Furthermore, the magnetic levitation bearing includes a moving ring and a fixed bearing member. The moving ring is fixed on the outer surface of the main shaft, and the fixed bearing member is fixed on the inner wall of the machine shell outside the moving ring.

[0013] Furthermore, the fixed bearing member includes a fixed ring and a magnet inner ring. The fixed ring is fixed on the inner wall of the machine shell outside the moving ring. A first groove adapted to the moving ring is formed inside the fixed ring. A suspension gap is formed between the moving ring and the inner wall of the first groove. The magnet inner ring is fixed inside the fixed ring and is arranged opposite to the moving ring. The magnet inner ring and the fixed ring are of an integrally formed structure. Anti-collision gaskets are evenly distributed on the inner wall of the first groove. A second groove is formed inside the fixed ring, and a plurality of electromagnets are evenly distributed on the inner wall of the second groove.

[0014] Furthermore, two opposite cooling grooves are formed inside the fixed ring, and a plurality of connecting grooves are evenly distributed between the two cooling grooves.

[0015] Further, the water cooling mechanism includes a coolant storage tank and a circulation pump. The coolant storage tank is fixedly arranged on the outer surface of the machine shell. The outlet end of the coolant storage tank is connected to the inside of any one of the cooling tanks through a liquid guide pipe. The output end of the circulation pump is connected to the inlet end of the coolant storage tank through a liquid guide pipe, and the input end of the circulation pump is connected to the inside of the other cooling tank through a liquid guide pipe.

[0016] Further, the specific process of judging vibration abnormality and conducting abnormality diagnosis and analysis is as follows:

[0017] S101. There are several vibration sensors radially distributed on the outer side of the main shaft. The vibration sensors are marked as M, and M is a natural number greater than 1. Then, the vibration data obtained by each vibration sensor is marked as Mf. The vibration data Mf includes the vibration amplitude Fa and the vibration frequency Fh.

[0018] S102. Obtain the standard vibration range, which includes the normal vibration amplitude range (Fai, Faj) and the normal vibration frequency range (Fhi, Fhj).

[0019] S103. Calculate the abnormality coefficient Ki of the vibration data Mf one by one according to the following formula: , where e1 and e2 are preset weight coefficients. The abnormality coefficient Ki is used to reflect the deviation between the real-time vibration data and the standard vibration range. The larger the abnormality coefficient Ki, the more the real-time vibration data deviates from the standard vibration range. On the contrary, the smaller the abnormality coefficient Ki, the closer the real-time vibration data is to the standard vibration range.

[0020] S104. Obtain the preset abnormality judgment threshold. If the abnormality coefficient is greater than or equal to the abnormality judgment threshold, the vibration data is abnormal, and the area where the vibration sensor from which the vibration data comes is located is marked as the abnormal point Mk.

[0021] Further, the specific process of generating an adjustment instruction according to the abnormality diagnosis and analysis is as follows:

[0022] S201. Establish a two-dimensional coordinate system with the center point of the main shaft as the origin, and mark the vibration sensors M on the two-dimensional coordinate system one by one. According to the abnormality diagnosis and analysis, obtain the position coordinates Mk(xk, yk) of the abnormal point Mk.

[0023] S202. Mark several electromagnets on the two-dimensional coordinate system one by one to obtain the position coordinates P(xp, yp) of the electromagnets. According to the positional relationship between the vibration sensors and the electromagnets, obtain the position coordinates of the selected electromagnet corresponding to the abnormal point MK.

[0024] S203. Obtain the abnormality coefficient, and calculate the current Ip to be energized for the selected electromagnet according to the following formula: , where d is a preset proportional coefficient.

[0025] Furthermore, the specific process of controlling the cooling cycle speed of the water-cooling mechanism according to the cooling demand coefficient is as follows:

[0026] S301. Obtain the working temperature data Ti of the magnetic levitation bearing and the standard temperature range (Tmin, Tmax), and calculate the temperature fluctuation coefficient Ut according to the following formula: ;

[0027] S302. Obtain the cooling efficiency Wi of the water-cooling mechanism, and calculate the cooling cycle speed Vi of the water-cooling mechanism according to the following formula: , where e3 is a preset proportionality coefficient.

[0028] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0029] 1. For the high-speed permanent magnet motor of the mine main fan based on magnetic levitation technology, the existing mechanical bearing is replaced by a magnetic levitation bearing. The magnetic levitation bearing includes a moving ring and a magnet inner ring arranged oppositely, and the moving ring is completely covered by the first groove on the inner side of the fixed ring. The magnetic polarities of the relative working surfaces of the moving ring and the magnet inner ring are the same, that is, both are N poles or both are S poles. Due to the magnetic repulsive force between the relative working surfaces of the moving ring and the magnet inner ring, the moving ring can be in a completely suspended state relative to the magnet inner ring, so that the main shaft and the drill are suspended and supported together, making the operation of the main shaft and its rotor more stable and ensuring the high-speed rotation requirement of the main shaft.

[0030] 2. For the high-speed permanent magnet motor of the mine main fan based on magnetic levitation technology, the temperature control unit obtains and processes the working temperature data of the magnetic levitation bearing, and controls the water-cooling mechanism to adjust the cooling cycle speed, that is, the output power of the circulation pump. The coolant in the coolant storage tank is introduced into the cooling tank through the liquid guide pipe to cool the fixed ring. At the same time, the heat on the surface of the moving ring is taken away through the heat exchange principle to cool the magnetic levitation bearing, ensuring that the motor can work normally in the harsh environment of the mine tunnel.

[0031] 3. For the high-speed permanent magnet motor of the mine main fan based on magnetic levitation technology, the vibration data during the rotation of the main shaft is obtained by the vibration sensor arranged outside the main shaft. When the main shaft has abnormal vibration, the electromagnet is connected to the circuit. The magnetic polarities of the relative working surfaces of the moving ring and the electromagnet are also the same. The suspension angle of the moving ring is adjusted by the electromagnet to solve the abnormal vibration, enhancing the bearing capacity of the magnetic levitation bearing, improving the suspension rigidity and support reliability of the magnetic levitation bearing. Therefore, the present invention fundamentally avoids the product failure problem caused by the easy failure of ordinary bearings or electromagnetic levitation bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Shows the overall external structure schematic diagram of the present invention;

[0033] Figure 2 Shows a schematic diagram of the overall internal structure of the present invention;

[0034] Figure 3 Shows a schematic diagram of the internal structure of the stator of the present invention;

[0035] Figure 4 Shows a schematic diagram of the structure of the intelligent control system of the present invention;

[0036] Legend: 1. Machine shell; 2. Main shaft; 3. Stator; 4. Rotor; 5. Through groove; 6. Moving ring; 7. Fixed ring; 8. First groove; 9. Inner magnet ring; 10. Anti-collision gasket; 11. Second groove; 12. Electromagnet; 13. Cooling groove; 14. Connecting groove; 15. Coolant storage tank; 16. Liquid guide pipe; 17. Circulation pump; 18. Liquid guide pipe. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0038] Embodiment 1:

[0039] As Figures 1 - 3 shown, a high-speed permanent magnet motor for a mine main fan based on magnetic levitation technology includes a machine shell 1, a main shaft 2 penetrating through the inside of the machine shell 1 and extending to the outside of the machine shell 1, and an intelligent control system. A plurality of stators 3 are fixedly provided on the inner wall of the machine shell 1. A rotor 4 is sleeved on the outer surface of the main shaft 2. A through groove 5 is opened on one end surface of the machine shell 1. A magnetic levitation bearing for fixing the main shaft 2 is fixedly provided on the inner wall of the through groove 5. A water cooling mechanism for cooling the magnetic levitation bearing is fixedly provided on the outer surface of the machine shell 1;

[0040] The magnetic levitation bearing includes a moving ring 6 and a fixed bearing member. The moving ring 6 is fixedly provided on the outer surface of the main shaft 2. The fixed bearing member is fixedly provided on the inner wall of the machine shell 1 outside the moving ring 6.

[0041] The fixed bearing member includes a fixed ring 7 and a magnet inner ring 9. The fixed ring 7 is fixedly arranged at the inner wall of the housing 1 outside the moving ring 6. A first groove 8 adapted to the moving ring 6 is formed on the inner side of the fixed ring 7. A suspension gap is formed between the moving ring 6 and the inner wall of the first groove 8. The magnet inner ring 9 is fixedly arranged inside the fixed ring 7 and is arranged opposite to the moving ring 6. The magnet inner ring 9 and the fixed ring 7 are of an integrally formed structure. Anti-collision gaskets 10 are evenly distributed at the inner wall of the first groove 8. A second groove 11 is formed inside the fixed ring 7, and a plurality of electromagnets 12 are evenly distributed at the inner wall of the second groove 11.

[0042] Two opposite cooling grooves 13 are formed inside the fixed ring 7, and a plurality of connecting grooves 14 are evenly distributed between the two cooling grooves 13.

[0043] The water cooling mechanism includes a coolant storage tank 15 and a circulation pump 17. The coolant storage tank 15 is fixedly arranged on the outer surface of the housing 1. The outlet end of the coolant storage tank 15 is connected to the inside of any one of the cooling grooves 13 through a liquid guide pipe 16. The output end of the circulation pump 17 is connected to the inlet end of the coolant storage tank 15 through a liquid guide pipe 16. The input end of the circulation pump 17 is connected to the inside of the other cooling groove 13 through a liquid guide pipe 16.

[0044] The working principle is as follows: The existing mechanical bearing is replaced by a magnetic suspension bearing. The magnetic suspension bearing includes a moving ring 6 and a magnet inner ring 9 which are arranged opposite to each other. The moving ring 6 is completely covered by the first groove 8 inside the fixed ring 7. The magnetic polarities of the opposite working surfaces of the moving ring 6 and the magnet inner ring 9 are the same, that is, both are N poles or both are S poles. Due to the magnetic repulsive force between the opposite working surfaces of the moving ring 6 and the magnet inner ring 9, the moving ring 6 can be in a completely suspended state relative to the magnet inner ring 9, so that the main shaft 2 and the drill are suspended and supported together, making the operation of the main shaft 2 and its rotor 4 more stable and ensuring the high-speed rotation requirement of the main shaft 2.

[0045] At the same time, the working temperature data of the magnetic suspension bearing is obtained and processed by the temperature control unit, and the water cooling mechanism is controlled to adjust the cooling cycle speed, that is, the output power of the circulation pump 17. The coolant in the coolant storage tank 15 is introduced into the cooling groove 13 through the liquid guide pipe 16 to cool down the fixed ring 7. At the same time, the heat on the surface of the moving ring 6 is taken away through the heat exchange principle to cool down the magnetic suspension bearing, ensuring that the motor can work normally in the harsh environment of the mine tunnel.

[0046] Vibration data during the rotation of the main shaft 2 is obtained by a vibration sensor arranged outside the main shaft 2. When abnormal vibration occurs in the main shaft 2, the electromagnet 12 is connected to the circuit. The magnetic polarities of the relative working surfaces of the moving ring 6 and the electromagnet 12 are the same. The suspension angle of the moving ring 6 is adjusted by the electromagnet 12 to solve the abnormal vibration, enhance the bearing capacity of the magnetic levitation bearing, improve the suspension rigidity and support reliability of the magnetic levitation bearing. Therefore, the present invention fundamentally avoids the product failure problem caused by the easy failure of ordinary bearings or electromagnetic levitation bearings.

[0047] Embodiment 2:

[0048] As Figure 4 shown, a high-speed permanent magnet motor for a mine main ventilation fan based on magnetic levitation technology includes a machine shell 1, a main shaft 2 passing through the inside of the machine shell 1 and extending to the outside of the machine shell 1, and an intelligent control system. The intelligent control system includes a data acquisition unit, a balance analysis unit, a balance control unit, and a temperature control unit;

[0049] The data acquisition unit includes a temperature monitoring module and a vibration monitoring module. The temperature monitoring module is used to obtain the working temperature data of the magnetic levitation bearing through a temperature sensor arranged outside the magnetic levitation bearing and send it to the temperature control unit. The vibration monitoring module is used to obtain the vibration data during the rotation of the main shaft 2 through a vibration sensor arranged outside the main shaft 2 and send it to the balance analysis unit;

[0050] The balance analysis unit is used to acquire and process the vibration data. The vibration data includes the vibration amplitude and the vibration frequency. The standard vibration range is obtained, and based on the real-time vibration data and the standard vibration range, it is judged whether the vibration is abnormal. The abnormal vibration is analyzed for abnormal diagnosis, and an adjustment instruction is generated according to the abnormal diagnosis analysis and sent to the balance control unit;

[0051] The specific process of judging the vibration abnormality and performing the abnormal diagnosis analysis is as follows:

[0052] S101. A number of vibration sensors are radially distributed outside the main shaft 2. The vibration sensors are marked as M, and M is a natural number greater than 1. Then the vibration data obtained by each vibration sensor is marked as Mf. The vibration data Mf includes the vibration amplitude Fa and the vibration frequency Fh;

[0053] S102. The standard vibration range is obtained. The standard vibration range includes the normal range of vibration amplitude (Fai, Faj) and the normal range of vibration frequency (Fhi, Fhj);

[0054] S103. The abnormality coefficient Ki of the vibration data Mf is calculated one by one according to the following formula: , where e1 and e2 are preset weight coefficients, and the anomaly coefficient Ki is used to reflect the deviation between the real-time vibration data and the standard vibration range. The larger the anomaly coefficient Ki, the more the real-time vibration data deviates from the standard vibration range. On the contrary, the smaller the anomaly coefficient Ki, the closer the real-time vibration data is to the standard vibration range;

[0055] S104. Obtain the preset anomaly judgment threshold. If the anomaly coefficient is greater than or equal to the anomaly judgment threshold, the vibration data is abnormal, and the area where the vibration sensor from which the vibration data comes is marked as the abnormal point Mk.

[0056] The specific process of generating the adjustment instruction according to the anomaly diagnosis and analysis is as follows:

[0057] S201. Establish a two-dimensional coordinate system with the center point of the main shaft 2 as the origin, and mark the vibration sensors M one by one on the two-dimensional coordinate system. Obtain the position coordinates Mk(xk, yk) of the abnormal point Mk according to the anomaly diagnosis and analysis;

[0058] S202. Mark a number of electromagnets 12 one by one on the two-dimensional coordinate system to obtain the position coordinates P(xp, yp) of the electromagnets 12. According to the positional relationship between the vibration sensor and the electromagnets 12, obtain the position coordinates of the selected electromagnets 12 corresponding to the abnormal point MK;

[0059] S203. Obtain the anomaly coefficient, and calculate the current Ip to be energized for the selected electromagnet 12 according to the following formula: , where d is a preset proportionality coefficient.

[0060] The balance control unit obtains and processes the adjustment instruction, analyzes and obtains the selected electromagnet 12 and the current to be energized according to the adjustment instruction, controls the selected electromagnet 12 to be connected to the circuit and makes the current flowing through it reach the current to be energized, so as to realize balance adjustment and ensure that the main shaft 2 rotates at a high speed and stably.

[0061] The temperature control unit is used to obtain and process the working temperature data of the magnetic suspension bearing, calculate the temperature fluctuation coefficient of the magnetic suspension bearing according to the working temperature data and the standard temperature range, and then calculate the cooling cycle speed of the water cooling mechanism according to the cooling efficiency of the water cooling mechanism, and control the water cooling mechanism to reach the required cooling cycle speed to realize real-time cooling adjustment.

[0062] The specific process of controlling the cooling cycle speed of the water cooling mechanism according to the cooling demand coefficient is as follows:

[0063] S301. Obtain the working temperature data Ti of the magnetic suspension bearing and the standard temperature range (Tmin, Tmax), and calculate the temperature fluctuation coefficient Ut according to the following formula: ;

[0064] S302. Obtain the cooling efficiency Wi of the water cooling mechanism, and calculate the cooling cycle speed Vi of the water cooling mechanism according to the following formula: , where e3 is a preset proportionality coefficient.

[0065] The setting of the interval and the size of the threshold is for the convenience of comparison. Regarding the size of the threshold, it depends on the amount of sample data and the number of base numbers set by those skilled in the art for each group of sample data; as long as the proportional relationship between the parameter and the quantized value is not affected.

[0066] The above formulas are all calculated by removing the dimension and taking their numerical values. The formulas are obtained by collecting a large amount of data for software simulation to get a formula closest to the actual situation. The preset parameters in the formulas are set by those skilled in the art according to the actual situation;

[0067] In the two embodiments provided in the present application, it should be understood that the disclosed device and system can be implemented in other ways; for example, the device embodiments described above are only illustrative. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed; another point, the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the device or module can be in an electrical, mechanical or other form;

[0068] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A high-speed permanent magnet motor for a main fan for a mine based on magnetic levitation technology, comprising a casing (1), a main shaft (2) penetrating the inside of the casing (1) and extending to the outside of the casing (1), and an intelligent control system, wherein a plurality of stators (3) are fixedly arranged on the inner wall of the casing (1), and a rotor (4) is sleeved on the outer surface of the main shaft (2), characterized in that: A through groove (5) is formed on the surface of one end of the housing (1); a magnetic bearing for fixing the main shaft (2) is fixedly provided on the inner wall of the through groove (5); and a water cooling mechanism for cooling the magnetic bearing is fixedly provided on the outer surface of the housing (1); The magnetic suspension bearing comprises a moving ring (6) and a fixed bearing component, wherein the moving ring (6) is fixedly arranged on the outer surface of the main shaft (2), and the fixed bearing component is fixedly arranged on the inner wall of the casing (1) outside the moving ring (6); The fixed bearing member comprises a fixed ring (7) and a magnet inner ring (9); the fixed ring (7) is fixedly arranged on the inner wall of the housing (1) outside the moving ring (6); a first groove (8) adapted to the moving ring (6) is provided on the inner side of the fixed ring (7); a suspension gap is formed between the moving ring (6) and the inner wall of the first groove (8); the magnet inner ring (9) is fixedly arranged inside the fixed ring (7) and arranged opposite to the moving ring (6); the magnet inner ring (9) and the fixed ring (7) are an integrally formed structure; anti-collision pads (10) are evenly distributed on the inner wall of the first groove (8); a second groove (11) is provided inside the fixed ring (7); and a plurality of electromagnets (12) are evenly distributed on the inner wall of the second groove (11); The intelligent control system includes a data acquisition unit, a balance analysis unit, a balance control unit and a temperature control unit; The data acquisition unit comprises a temperature monitoring module and a vibration monitoring module, wherein the temperature monitoring module is used to acquire operating temperature data of the magnetic bearing through a temperature sensor arranged outside the magnetic bearing, and send the data to the temperature control unit, and the vibration monitoring module is used to acquire vibration data of the main shaft (2) during rotation through a vibration sensor arranged outside the main shaft (2), and send the data to the balance analysis unit; The balance analysis unit is used to obtain and process vibration data, wherein the vibration data includes vibration amplitude and vibration frequency, obtain a standard vibration range, judge vibration abnormality according to the real-time vibration data and the standard vibration range, perform abnormality diagnosis and analysis on the vibration abnormality, and generate an adjustment instruction according to the abnormality diagnosis and analysis and send it to the balance control unit; The specific process of judging vibration abnormality and conducting abnormality diagnosis and analysis is as follows: S101, a plurality of vibration sensors are radially distributed outside the main shaft (2), the vibration sensors are marked as M, and M is a natural number greater than 1, and the vibration data obtained by each vibration sensor is marked as Mf, and the vibration data Mf includes a vibration amplitude Fa and a vibration frequency Fh; S102, obtaining a standard vibration range, wherein the standard vibration range includes a normal range of vibration amplitude (Fai, Faj) and a normal range of vibration frequency (Fhi, Fhj); S103, calculating the abnormal coefficient Ki of the vibration data Mf one by one according to the following formula: , where e1 and e2 are preset weight coefficients, and the abnormal coefficient Ki is used to reflect the deviation between the real-time vibration data and the standard vibration range; S104, obtaining a preset abnormality judgment threshold, if the abnormality coefficient is greater than or equal to the abnormality judgment threshold, the vibration data is abnormal, and the area where the vibration sensor of the vibration data source is located is marked as an abnormal point Mk; The specific process of generating adjustment instructions based on abnormal diagnosis analysis is as follows: S201, establishing a two-dimensional coordinate system with the center point of the main axis (2) as the origin, and marking the vibration sensors M one by one on the two-dimensional coordinate system, and obtaining the position coordinates Mk (xk, yk) of the abnormal point Mk according to the abnormality diagnosis analysis; S202, marking a plurality of electromagnets (12) one by one on a two-dimensional coordinate system to obtain position coordinates P (xp, yp) of the electromagnets (12), and obtaining the position coordinates of the selected electromagnets (12) corresponding to the abnormal point MK according to the positional relationship between the vibration sensor and the electromagnets (12); S203, obtaining the abnormal coefficient, and calculating the current Ip of the selected electromagnet (12) according to the following formula: , where d is the preset proportionality factor; The balancing control unit obtains and processes the adjustment instruction, obtains the selected electromagnet (12) and the current to be passed according to the analysis of the adjustment instruction, controls the selected electromagnet (12) to be connected to the circuit and makes the current connected to it reach the current to be passed, so as to achieve balancing adjustment and ensure that the main shaft (2) maintains high-speed and stable rotation; The temperature control unit is used to obtain and process the working temperature data of the magnetic levitation bearing, calculate the temperature fluctuation coefficient of the magnetic levitation bearing according to the working temperature data and the standard temperature range, and then calculate the cooling cycle speed of the water cooling mechanism according to the cooling efficiency of the water cooling mechanism, and control the water cooling mechanism to reach the required cooling cycle speed to realize real-time cooling regulation.

2. The high-speed permanent magnet motor for a main fan for mining based on magnetic levitation technology according to claim 1 is characterized in that: Two opposing cooling grooves (13) are provided inside the fixed ring (7), and a plurality of connecting grooves (14) are evenly distributed between the two cooling grooves (13).

3. The high-speed permanent magnet motor for a main fan for mining based on magnetic levitation technology according to claim 1 is characterized in that: The water cooling mechanism comprises a cooling liquid storage tank (15) and a circulation pump (17); the cooling liquid storage tank (15) is fixedly mounted on the outer surface of the housing (1); the outlet end of the cooling liquid storage tank (15) is connected to the interior of any cooling tank (13) via a liquid conduit (16); the output end of the circulation pump (17) is connected to the inlet end of the cooling liquid storage tank (15) via the liquid conduit (16); and the input end of the circulation pump (17) is connected to the interior of another cooling tank (13) via the liquid conduit (16).

4. The high-speed permanent magnet motor for a main fan for mining based on magnetic levitation technology according to claim 1 is characterized in that: The specific process of controlling the cooling cycle speed of the water cooling mechanism according to the cooling demand coefficient is as follows: S301, obtain the working temperature data Ti and the standard temperature range (Tmin, Tmax) of the magnetic bearing, and calculate the temperature fluctuation coefficient Ut according to the following formula: ; S302, obtaining the cooling efficiency Wi of the water cooling mechanism, and calculating the cooling cycle speed Vi of the water cooling mechanism according to the following formula: , where e3 is the preset proportional coefficient.

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