Mining main fan high-speed permanent magnet motor based on magnetic suspension technology

Abstract

The invention discloses a mining main fan high-speed permanent magnet motor based on a magnetic suspension technology, and relates to the technical field of permanent magnet motors, and the mining main fan high-speed permanent magnet motor comprises a housing, a main shaft which penetrates through the interior of the housing and extends to the outer side of the housing, and an intelligent control system, a magnetic suspension bearing used for fixing the main shaft is fixedly arranged on the inner wall of the penetrating groove, and a water cooling mechanism used for cooling the magnetic suspension bearing is fixedly arranged on the outer side surface of the machine shell. The intelligent control system comprises a data acquisition unit, a balance analysis unit, a balance control unit and a temperature control unit; an existing mechanical bearing is replaced by the magnetic suspension bearing, the magnetic suspension bearing comprises the moving ring and the magnet inner ring which are oppositely arranged, the magnetic polarities of the opposite working faces of the moving ring and the magnet inner ring are the same, and the moving ring can be in a complete suspension state relative to the magnet inner ring under the action of magnetic repulsive force; therefore, the main shaft and the drill are supported together in a suspended mode, and the requirement for high rotating speed of the main shaft is met.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet motors, and in particular to a high-speed permanent magnet motor for a main fan for a mine based on magnetic suspension technology. Background Art

[0002] The permanent magnet motor in the prior art is 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 when rotating, thereby providing a greater output torque. Its structure consists of a stator, a rotor, and a bearing supporting the rotor shaft (also known as the motor main shaft, rotating shaft, rotating shaft, drive shaft), etc. Bearings are generally required to support the rotor shaft.

[0003] However, when ordinary bearings are used to support the rotor shaft, mechanical friction will inevitably be generated due to mechanical contact during the operation of the rotor. Mechanical friction not only increases the friction resistance of the rotor, causes wear of moving parts, and generates mechanical vibration and noise, but also causes heating of parts, deteriorating the performance of the lubricant, and seriously causes uneven air gap of the motor, heating of the winding, and increased temperature rise, thereby reducing the efficiency of the motor and shortening the service life of the motor. This is especially true when used in mining fans, which are mainly used for ventilation, cooling and dehumidification, explosion-proof and smoke exhaust. The working environment is complex and the workload is large. Therefore, the speed of the permanent magnet motor in the prior art is limited and cannot meet the high speed requirements. In addition, the large friction will generate more heat energy. In addition, oil lubrication is required, especially since its axial bearing capacity is limited. When the axial force is relatively large, it is difficult for ordinary bearings to achieve long-term operation and they are easily damaged, resulting in 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 now proposed. Summary of the invention

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

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a high-speed permanent magnet motor for a main fan of a mine based on magnetic levitation technology, comprising a casing, a main shaft penetrating the inside of the casing and extending to the outside of the casing, and an intelligent control system, wherein a plurality of stators are fixedly arranged on the inner wall of the casing, a rotor is sleeved on the outer surface of the main shaft, a through groove is opened on the surface of one end of the casing, a magnetic levitation bearing for fixing the main shaft is fixedly arranged on the inner wall of the through groove, and a water cooling mechanism for cooling the magnetic levitation bearing is fixedly arranged on the outer surface of the casing;

[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 working temperature data of the magnetic bearing through a temperature sensor arranged on the outside of the magnetic bearing, and send it to the temperature control unit. The vibration monitoring module is used to obtain the vibration data of the main shaft during the rotation process through a vibration sensor arranged on the outside of the main shaft, and send it to the balance analysis unit.

[0009] 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;

[0010] The balancing control unit obtains and processes the adjustment instructions, obtains the selected electromagnet and the current to be passed according to the analysis of the adjustment instructions, controls the selected electromagnet to access 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 spindle maintains high-speed and stable rotation.

[0011] 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.

[0012] Furthermore, the magnetic suspension bearing comprises a moving ring and a fixed bearing component, wherein the moving ring is fixedly arranged on the outer surface of the main shaft, and the fixed bearing component is fixedly arranged on the inner wall of the casing outside the moving ring.

[0013] Furthermore, the fixed bearing member includes a fixed ring and a magnet inner ring, the fixed ring is fixedly arranged at the inner wall of the casing outside the moving ring, a first groove adapted to the moving ring is opened on the inner side of 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 fixedly arranged inside the fixed ring and arranged opposite to the moving ring, the magnet inner ring and the fixed ring are an integrally formed structure, anti-collision gaskets are evenly distributed on the inner wall of the first groove, a second groove is opened 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 provided inside the fixed ring, and a plurality of connecting grooves are evenly distributed between the two cooling grooves.

[0015] Furthermore, the water cooling mechanism includes a coolant storage tank and a circulation pump, the coolant storage tank is fixedly mounted on the outer surface of the casing, the outlet end of the coolant storage tank is connected to the interior of any cooling tank through a liquid conduit, the output end of the circulation pump is connected to the inlet end of the coolant storage tank through the liquid conduit, and the input end of the circulation pump is connected to the interior of another cooling tank through the liquid conduit.

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

[0017] S101, a plurality of vibration sensors are radially distributed outside the main shaft, 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;

[0018] 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);

[0019] 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. The larger the abnormal coefficient Ki is, the more the real-time vibration data deviates from the standard vibration range. On the contrary, the smaller the abnormal coefficient Ki is, the closer the real-time vibration data is to the standard vibration range.

[0020] 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 where the vibration data is sourced is marked as an abnormal point Mk.

[0021] Furthermore, the specific process of generating adjustment instructions based on abnormal diagnosis analysis is as follows:

[0022] S201, establishing a two-dimensional coordinate system with the center point of the main axis 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;

[0023] S202, marking a number of electromagnets one by one on a two-dimensional coordinate system to obtain the position coordinates P (xp, yp) of the electromagnets, and obtaining the position coordinates of the selected electromagnets corresponding to the abnormal point MK according to the positional relationship between the vibration sensor and the electromagnets;

[0024] S203, obtain the abnormal coefficient, and calculate the current Ip of the selected electromagnet according to the following formula: , where d is the 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 and the standard temperature range (Tmin, Tmax) of the magnetic bearing, and calculate the temperature fluctuation coefficient Ut according to the following formula: ;

[0027] 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.

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

[0029] 1. The high-speed permanent magnet motor of the main fan for mining based on magnetic levitation technology replaces the existing mechanical bearing with a magnetic levitation bearing. The magnetic levitation bearing includes a moving ring and a magnet inner ring which are arranged relatively to each other, and the moving ring is completely covered by the first groove on the inner side of the fixed ring. The relative working surfaces of the moving ring and the magnet inner ring have the same magnetic polarity, that is, they are both N poles or S poles. Due to the magnetic repulsion 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, so that the operation of the main shaft and its rotor is more stable, and the high speed requirement of the main shaft is guaranteed.

[0030] 2. The high-speed permanent magnet motor of the main fan for mining based on magnetic levitation technology obtains and processes the working temperature data of the magnetic bearing through the temperature control unit, and controls the water cooling mechanism to adjust the cooling cycle speed, that is, the output power of the circulating 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 bearing, ensuring that the motor can work normally in the harsh environment of the mine.

[0031] 3. The high-speed permanent magnet motor of the main fan for mining based on the magnetic levitation technology obtains the vibration data of the main shaft during rotation by means of a vibration sensor arranged on the outside of the main shaft. When the main shaft vibrates abnormally, 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, thereby enhancing the bearing capacity of the magnetic levitation bearing, and improving the suspension rigidity and supporting 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 The overall external structure schematic diagram of the present invention is shown;

[0033] Figure 2 The overall internal structure schematic diagram of the present invention is shown;

[0034] Figure 3 The schematic diagram of the internal structure of the stator of the present invention is shown;

[0035] Figure 4 The structure schematic diagram of the intelligent control system of the present invention is shown;

[0036] Legend: 1. Casing; 2. Main shaft; 3. Stator; 4. Rotor; 5. Through slot; 6. Moving ring; 7. Fixed ring; 8. First slot; 9. Magnet inner ring; 10. Anti-collision gasket; 11. Second slot; 12. Electromagnet; 13. Cooling slot; 14. Connecting slot; 15. Coolant storage tank; 16. Liquid guide tube; 17. Circulation pump; 18. Liquid guide tube. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1:

[0039] like Figure 1-3 As shown, a high-speed permanent magnet motor for a main fan of a mine based on magnetic levitation technology comprises 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. A plurality of stators 3 are fixedly arranged on the inner wall of the casing 1, a rotor 4 is sleeved on the outer surface of the main shaft 2, a through groove 5 is opened on the surface of one end of the casing 1, a magnetic bearing for fixing the main shaft 2 is fixedly arranged on the inner wall of the through groove 5, and a water cooling mechanism for cooling the magnetic bearing is fixedly arranged on the outer surface of the casing 1;

[0040] The magnetic bearing comprises a moving ring 6 and a fixed bearing member. The moving ring 6 is fixedly arranged on the outer surface of the main shaft 2 , and the fixed bearing member is fixedly arranged on the inner wall of the casing 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 on the inner wall of the casing 1 outside the moving ring 6. A first groove 8 adapted to the moving ring 6 is opened 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 gaskets 10 are evenly distributed on the inner wall of the first groove 8. A second groove 11 is opened inside the fixed ring 7. A plurality of electromagnets 12 are evenly distributed on the inner wall of the second groove 11.

[0042] Two opposite 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 .

[0043] The water cooling mechanism includes a coolant tank 15 and a circulation pump 17. The coolant tank 15 is fixedly mounted on the outer surface of the casing 1. The outlet end of the coolant tank 15 is connected to the interior of any cooling tank 13 through a liquid conduit 16. The output end of the circulation pump 17 is connected to the inlet end of the coolant tank 15 through the liquid conduit 16. The input end of the circulation pump 17 is connected to the interior of another cooling tank 13 through the liquid conduit 16.

[0044] The working principle is as follows: the existing mechanical bearing is replaced by a magnetic suspension bearing, which includes a moving ring 6 and a magnet inner ring 9 that are arranged opposite to each other, and the moving ring 6 is completely covered by the first groove 8 on the inner side of the fixed ring 7, and the relative working surfaces of the moving ring 6 and the magnet inner ring 9 have the same magnetic polarity, that is, the same N pole or the same S pole. Due to the magnetic repulsion between the relative 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, so that the operation of the main shaft 2 and its rotor 4 is more stable, and the high speed requirement of the main shaft 2 is guaranteed;

[0045] At the same time, the temperature control unit obtains and processes the working temperature data of the magnetic bearing, and controls the water cooling mechanism to adjust the cooling cycle speed, that is, the output power of the circulating pump 17, and guides the cooling liquid in the coolant storage tank 15 into the cooling tank 13 through the liquid guide pipe 16 to cool the fixed ring 7. At the same time, the heat on the surface of the dynamic ring 6 is taken away through the heat exchange principle to cool the magnetic bearing, ensuring that the motor can work normally in the harsh environment in the mine cave;

[0046] Vibration data of the main shaft 2 during rotation is obtained by a vibration sensor arranged on the outside of the main shaft 2. When the main shaft 2 vibrates abnormally, 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 also the same. The suspension angle of the moving ring 6 is adjusted by the electromagnet 12 to solve the abnormal vibration, thereby enhancing the bearing capacity of the magnetic suspension bearing, and improving the suspension rigidity and supporting reliability of the magnetic suspension bearing. Therefore, the present invention fundamentally avoids the product failure problem caused by the easy failure of ordinary bearings or electromagnetic suspension bearings.

[0047] Embodiment 2:

[0048] like Figure 4 As shown, a high-speed permanent magnet motor for a main fan for mining based on magnetic levitation technology comprises a casing 1, a main shaft 2 that runs through the inside of the casing 1 and extends to the outside of the casing 1, and an intelligent control system, wherein the intelligent control system comprises 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 bearing through a temperature sensor arranged on the outside of the magnetic bearing, and send it to the temperature control unit. The vibration monitoring module is used to obtain the vibration data of the main shaft 2 during the rotation process through a vibration sensor arranged on the outside of the main shaft 2, and send it to the balance analysis unit;

[0050] The balance analysis unit is used to obtain and process vibration data, the vibration data includes vibration amplitude and vibration frequency, obtain the standard vibration range, judge the 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 adjustment instructions according to the abnormality diagnosis and analysis and send them to the balance control unit;

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

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

[0053] S102, obtaining a standard vibration range, where the standard vibration range includes a normal range of vibration amplitude (Fai, Faj) and a normal range of vibration frequency (Fhi, Fhj);

[0054] 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. The larger the abnormal coefficient Ki is, the more the real-time vibration data deviates from the standard vibration range. On the contrary, the smaller the abnormal coefficient Ki is, the closer the real-time vibration data is to the standard vibration range.

[0055] 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 where the vibration data is sourced is marked as an abnormal point Mk.

[0056] The specific process of generating adjustment instructions based on abnormal diagnosis analysis is as follows:

[0057] 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;

[0058] 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 electromagnet 12, and obtaining the position coordinates of the selected electromagnet 12 corresponding to the abnormal point MK according to the positional relationship between the vibration sensor and the electromagnet 12;

[0059] S203, obtain the abnormal coefficient, and calculate the current Ip of the selected electromagnet 12 according to the following formula: , where d is the preset proportional coefficient.

[0060] 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 access 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.

[0061] 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.

[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 and the standard temperature range (Tmin, Tmax) of the magnetic bearing, and calculate the temperature fluctuation coefficient Ut according to the following formula: ;

[0064] 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.

[0065] The size of the interval and threshold is set to facilitate comparison. The size of the threshold depends on the amount of sample data and the number of bases set by technical personnel in this field for each group of sample data; as long as it does not affect the proportional relationship between the parameter and the quantized value.

[0066] The above formulas are all dimensionless and numerical calculations. The formula is a formula obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0067] In the two embodiments provided in the present application, it should be understood that the disclosed devices and systems can be implemented in other ways; for example, the device embodiments described above are only schematic, for example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed; another point, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, the indirect coupling or communication connection of devices or modules can be electrical, mechanical or other forms;

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which 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 1, 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 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 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: 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).

3. The high-speed permanent magnet motor for a main fan for mining based on magnetic levitation technology according to claim 2 is characterized in that: 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 gaskets (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).

4. The high-speed permanent magnet motor for a main fan for mining based on magnetic levitation technology according to claim 3 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).

5. 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).

6. 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 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 where the vibration data is sourced is marked as an abnormal point Mk.

7. 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 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 proportional coefficient.

8. 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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