A sensorless magnetic and aerodynamic hybrid bearing system, an air levitated power plant and a control method

Abstract

This invention relates to a sensorless magnetic-air hybrid bearing system, an air-suspended power device, and a control method. The magnetic-air hybrid bearing system includes a front radial air foil bearing, an axial air foil bearing, and an active axial magnetic bearing. A rear axial air foil bearing housing is fitted radially outside the front radial air foil bearing housing. An active axial magnetic bearing coil is wound within the space enclosed by the rear axial air foil bearing housing and the front radial air foil bearing housing. The control method of this invention is sensorless, adjusting the output current corresponding to different speeds based on an excitation current level table. This method quickly matches the target excitation current based on speed and pressure parameters using the excitation current level table, eliminating the need for complex real-time calculations, ensuring axial force balance, and providing rapid response.

Description

Technical Field

[0001] This invention relates to a sensorless magnetic-pneumatic hybrid bearing system, an air-suspended power device, and a control method, belonging to the technical field of magnetic-pneumatic hybrid bearings. Background Technology

[0002] Air-bearing devices are small in size, low in cost, have no mechanical friction, and high energy efficiency, making them promising for the market. However, due to the low load-bearing capacity of air bearings, the greater the axial force of the load driven by the air-bearing motor, the lower the actual dynamic range of the motor. In some cases, under high axial force, it is necessary to run the motor unloaded to the rated speed before applying a load. This limits its use to a very small speed range and a very small axial force fluctuation range, greatly restricting the application scenarios of air-bearing motors.

[0003] The reason why the large axial force of an air-bearing motor leads to its low dynamic range is as follows: The original load capacity range of the gas bearing at its rated speed is 0~F, and the minimum axial force of the load is F1. Therefore, the actual load capacity range of the gas bearing at its rated speed is F1~F. If F1 is close to F, the load axial force F1 will further increase and exceed the maximum axial force F of the gas bearing. At this time, the axial force of the load on the air-bearing motor can only operate within a very small range.

[0004] There are generally three main ways to address the issue of low dynamic range in air-suspended motors under heavy loads: 1. By pressurizing the gas bearing to increase the bearing support stiffness, this method can effectively improve the dynamic performance of the motor. However, it requires an additional air source, which increases the size of the equipment and reduces the overall energy efficiency. If an air compressor is placed next to the motor to supply air, resonance may cause the air suspension motor to run unstablely, or even the rotor to fall off, causing the gas bearing to fail at the same time.

[0005] 2. Increasing the size of the gas bearing increases the bearing support stiffness. However, radial increase leads to a decrease in the overall dynamic performance of the machine, a surge in design difficulty, and extremely high difficulty in mass production. Axial increase leads to a larger outer diameter of the axial thrust disc, excessively high linear velocity, and difficulty in finding suitable thrust disc materials.

[0006] 3. By introducing an additional magnetic levitation bearing to provide controllable electromagnetic force, the overall support stiffness can be improved. However, this also leads to an increase in the length of the motor rotor, increasing equipment costs and manufacturing difficulty. In addition, the introduction of a new thrust plate and the need for a displacement sensor result in a decrease in dynamic performance, making the design extremely difficult and hindering mass production.

[0007] Based on the operating characteristics of air-suspended motors, it can be found that the greater the axial force generated by the load of the air-suspended motor, the more difficult it is for the axial gas bearing to control the rotor's operating posture.

[0008] Therefore, a new type of bearing structure is urgently needed to improve the axial load capacity of air suspension motors. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a sensorless magnetic hybrid bearing system. By integrating a front radial air foil bearing, an axial air foil bearing, and an active axial magnetic bearing into the same magnetic hybrid bearing system, an integrated design of radial and axial support is achieved, reducing system volume and improving space utilization.

[0010] Meanwhile, an air suspension power device and its control method based on the above-mentioned magnetic-air hybrid bearing system are also provided. This control method is based on the excitation current level table to quickly match the target excitation current according to the speed and pressure parameters, without the need for complex real-time calculations, ensuring axial force balance and rapid response.

[0011] The technical solution of this invention is as follows: On one hand, the present invention provides a sensorless magnetic hybrid bearing system, including a front radial air foil bearing, an axial air foil bearing, and an active axial magnetic bearing. The front radial air foil bearing includes a front radial air foil bearing housing and a bottom foil, a radial corrugated foil, and a bushing fitted inside it. The axial air foil bearing includes a front axial air foil bearing housing, a front axial corrugated foil assembly, a thrust disk, a rear axial corrugated foil assembly, and a rear axial air foil bearing housing. The rear axial air foil bearing housing is fitted radially outside the front radial air foil bearing housing, and a magnetic bearing coil is wound within the space enclosed by the rear axial air foil bearing housing and the front radial air foil bearing housing to form an active axial magnetic bearing.

[0012] According to a preferred embodiment of the present invention, the front axial wave foil assembly / rear axial wave foil assembly includes a top foil and an axial wave foil, one end of the top foil and the axial wave foil being free, and the other end of the top foil and the axial wave foil being a fixed end fixed together, the fixed end being fixed to the outward-facing mounting surface of the rear axial air foil bearing seat; a magnetic field line passing ring is provided on the axial wave foil mounting surface of the rear axial air foil bearing seat.

[0013] According to a preferred embodiment of the present invention, the magnetic field lines pass through a ring filled with epoxy resin.

[0014] Secondly, the present invention provides an air suspension power device based on a hybrid bearing system, including a rotor and a stator. The rotor is fitted with a stator. The front end of the rotor is fitted with the magnetic hybrid bearing system and a fluid part. The fluid part includes a first working impeller. The first working impeller is fitted with a volute. The rear end of the rotor is fitted with a rear radial air foil bearing and a heat dissipation impeller.

[0015] Thirdly, the present invention provides a control method for the above-mentioned air suspension power equipment based on a hybrid bearing system, comprising: Start the air levitation power unit and accelerate to the minimum buoyancy speed N1; When the rotational speed of the air levitation power unit reaches the minimum buoyancy speed N1, based on the current minimum output pressure P1 of the air levitation power unit and in conjunction with the excitation current level table, the output current of the active axial magnetic bearing in the magnetic-air hybrid bearing system is adjusted to... I (N1,P1); When the rotational speed is increased or the output pressure of the fluid section is increased according to the actual working conditions, the output current of the active axial magnetic bearing is adjusted to the corresponding output current based on the excitation current level table. Once the air-suspended power equipment reaches its rated operating condition, adjust the output current of the active axial magnetic bearing to the target excitation current according to the excitation current level table. I (N n ,P m ), N n P represents the maximum rotational speed at which the rotor can float. m This indicates the maximum output pressure.

[0016] According to a preferred embodiment of the present invention, the process of obtaining the excitation current potential table includes: Obtain the speed-pressure correspondence table for the air-suspended power equipment; Obtain the axial force corresponding to each working point in the speed-pressure correspondence table to obtain the axial force working condition table; Calculate the excitation current corresponding to each working point in the axial force working condition table to obtain the excitation current point table of the air suspension power equipment.

[0017] According to a preferred embodiment of the present invention, obtaining the rotational speed-pressure correspondence table of the air-suspended power device includes: (1) Divide the rotational speed of the air suspension power equipment into n equal gears: N1, N2, ..., N n N1 to N n The rotational speed gradually increases; (2) Divide the adjustable output pressure range of the fluid in the air suspension power equipment at each speed gear into P1, P2, P3, P4, P5, P6, P7, P8, P9, P1, P1, P1, P2, P1, P2, P1, P2, P3, P4, P5, P1, P2, P1, P2, P2, P3, P4, P5, P1, P2, P2, P2, P3, P4, 2、 …、P m There are m gears in total, P1 to P2. m The outlet pressure gradually increases, and the output pressure value is measured by the pressure transmitter. (3) Obtain the speed-pressure correspondence table of the air suspension power equipment.

[0018] According to a preferred embodiment of the present invention, obtaining the axial force corresponding to each operating point in the speed-pressure correspondence table to obtain the axial force operating condition table includes: The axial force corresponding to each operating point in the speed-pressure correspondence table is estimated using numerical calculation methods to obtain the axial force operating condition table. The numerical calculation method includes: statistically analyzing x identical air suspension power devices at (N...)... i ,P j Axial force under operating conditions, N i P represents the i-th rotational speed, where i = 1, 2, 3…n; j This represents the outlet pressure of the j-th gear, where j = 1, 2, 3…m; based on obtaining the average axial force. and minimum axial force F ijmin Obtain the estimated value of axial force s represents the safety coefficient summarized based on past experience, such that s∈(0,1); , .

[0019] According to a preferred embodiment of the present invention, the axial force at each working point is obtained based on the axial force working condition table, and then... The excitation current was calculated. I ij This leads to the acquisition of the excitation current level table; C ij This represents the clearance between the active axial magnetic bearing and the thrust plate, where k represents a coefficient determined empirically.

[0020] According to a preferred embodiment of the present invention, when the rotational speed or pressure is increased according to actual working conditions, the output current of the active axial magnetic bearing is adjusted to the corresponding output current based on the excitation current level table; including: If the pressure is increased, the excitation current is gradually increased according to the closing time of the valve controlling the fluid output pressure. I (N1,P m ); Alternatively, if the speed is increased, the excitation current can be gradually increased according to the speed adjustment time of the frequency converter. I (N n ,P1).

[0021] The beneficial effects of this invention are as follows: 1. This application provides a sensorless magnetic-pneumatic hybrid bearing system. The structure of the rear axial air foil bearing housing and the front radial air foil bearing housing is improved. While ensuring the normal functioning of the axial air foil bearings, an active axial magnetic levitation bearing is placed in the included angle space between the outer walls of the rear axial air foil bearing housing and the front radial air foil bearing housing. This space serves as the winding space for the active axial magnetic bearing, forming an active axial magnetic bearing. This system can increase the load-bearing capacity of the magnetic-pneumatic hybrid bearing system without increasing the shaft length.

[0022] 2. The active axial magnetic levitation bearing introduced in the sensorless magnetic hybrid bearing system provides controllable electromagnetic force, improving the overall axial support stiffness without increasing the rotor length; and the axial air foil bearing and the front radial air foil bearing are not affected and can function normally. This design is ingenious, easy to process, and convenient for mass production.

[0023] 3. The control method for the air-suspended power equipment in this application can quickly match the target excitation current based on the excitation current level table according to the speed and pressure parameters, without the need for complex real-time calculations, ensuring axial force balance and rapid response. Attached Figure Description

[0024] Figure 1 This invention provides a schematic diagram of the structure of an air suspension blower with a sensorless magnetic hybrid bearing.

[0025] Figure 2 This is a partial three-dimensional structural diagram of the magnetic-gas hybrid bearing provided by the present invention.

[0026] Figure 3 A partial cross-sectional structural diagram of the magnetic-gas hybrid bearing provided by the present invention.

[0027] Figure 4 Performance curves of the air suspension power device provided by the present invention.

[0028] Figure 5 A flowchart illustrating the control method provided by the present invention.

[0029] 1. Front axial air foil bearing housing; 2. Rear axial air foil bearing housing; 3. Front radial air foil bearing housing; 4. Magnetic bearing coil; 5. Front radial air foil bearing; 6. Cover plate; 7. Rotor; 8. Stator; 9. Active axial magnetic bearing; 10. Thrust disc; 11. Rear radial air foil bearing; 12. Epoxy resin; 13. Magnetic field line through ring; 14. Bushing; 15. Radial corrugated foil; 16. Axial corrugated foil; 17. Top foil. Detailed Implementation

[0030] The following illustrations will disclose several embodiments of this application, providing a clear and complete description of the technical solution of the present invention, which constitutes a part of this application. The accompanying drawings are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. 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.

[0031] It should be noted that, unless otherwise defined, the directions such as up, down, left, and right mentioned herein refer to the embodiments of this application. Figure 1 The directions shown are up, down, left, and right. If the specific posture changes, the directional indication will also change accordingly. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Furthermore, in the various embodiments of this disclosure, the same or similar reference numerals denote the same or similar components.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can refer to a fixed connection, a detachable connection, or an integral part, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0034] Embodiments of the present invention provide a sensorless magnetic-pneumatic hybrid bearing system, comprising a front radial air foil bearing 5, an axial air foil bearing, and an active axial magnetic bearing. The front radial air foil bearing 5 includes a front radial air foil bearing housing 3 and a bottom foil, radial corrugated foil 15 and a bushing 14 fitted inside it; the axial air foil bearing includes a front axial air foil bearing housing 1, a front axial corrugated foil assembly, a thrust disk 10, a rear axial corrugated foil assembly and a rear axial air foil bearing housing 2. The rear axial air foil bearing housing 2 is fitted onto the outside of the front radial air foil bearing housing 3 in the radial direction, and a magnetic bearing coil 4 is wound around the space enclosed by the rear axial air foil bearing housing 2 and the front radial air foil bearing housing 3 to form an active axial magnetic bearing.

[0035] like Figure 3 As shown, the front radial air foil bearing 5 includes a front radial air foil bearing seat 3, a bottom foil, a bushing 14, and a radial corrugated foil 15. The radial corrugated foil 15 and the bottom foil are sequentially fitted between the bushing 14 and the front radial air foil bearing seat 3. The structure of the front radial air foil bearing 5 is not within the scope of this invention and will not be discussed here. Meanwhile, a cover plate 6 is provided at one end of the front radial air foil bearing seat 3 to axially limit the bottom foil, the radial corrugated foil 15, and the bushing 14.

[0036] In one exemplary embodiment, such as Figure 1 , 2 and Figure 3As shown, the front axial corrugated foil assembly / rear axial corrugated foil assembly includes a top foil 17 and an axial corrugated foil 16. One end of the top foil 17 and the axial corrugated foil 16 is free, while the other end is a fixed end that is fixed together. The fixed end is fixed to the outward-facing mounting surface of the rear axial air foil bearing housing 2. A magnetic field line passing ring 13 is provided on the mounting surface of the axial corrugated foil 16 of the rear axial air foil bearing housing 2. The fixed position of the fixed end on the mounting surface can be determined according to the dimensions.

[0037] In one exemplary embodiment, such as Figure 1 and Figure 3 As shown, the magnetic field lines pass through ring 13 filled with epoxy resin 12. This design enables the active axial magnetic bearing to adjust the axial position of the thrust disc 10, while the rear axial air foil bearing housing 2 provides a flat mounting surface for the axial foil 16, allowing the rear axial air foil bearing to function properly.

[0038] This invention provides an air suspension power device based on a hybrid bearing system, including a rotor 7 and a stator 8. The rotor 7 is externally fitted with the stator 8. The front end of the rotor 7 is fitted with the magnetic hybrid bearing system and a fluid part. The fluid part includes a first working impeller and a volute. The first working impeller is externally fitted with the volute. The rear end of the rotor 7 is fitted with a rear radial air foil bearing 11 and a heat dissipation impeller.

[0039] like Figure 1 As shown, when the rear end of the rotor 7 is fitted with a rear radial air foil bearing 11 and a heat dissipation impeller, the power equipment is an air suspension blower.

[0040] When the rear end of the rotor 7 is fitted with a rear radial air foil bearing 11, a heat dissipation impeller, and a second working impeller, the power equipment is an air suspension compressor, and the embodiments will not be described in detail.

[0041] This invention also provides a control method for the above-mentioned air suspension power equipment based on a hybrid bearing system, such as... Figure 5 As shown, it includes: Start the air levitation power equipment and accelerate to the minimum buoyancy speed N1; When the rotational speed of the air suspension power equipment reaches the minimum buoyancy speed N1, the output current of the active axial magnetic bearing 9 in the magnetic-air hybrid bearing system is adjusted to I(N1,P1) based on the minimum output pressure P1 of the fluid part in the air suspension power equipment fed back by the pressure transmitter and in conjunction with the excitation current level table. When the rotational speed is increased or the output pressure of the fluid section is increased according to the actual working conditions, the output current of the active axial magnetic bearing 9 is adjusted to the corresponding output current based on the excitation current level table. Once the air-suspended power equipment reaches its rated operating condition, adjust the output current of the active axial magnetic bearing 9 to the target excitation current I(N) according to the excitation current level table. n ,P m ), N n P represents the maximum rotational speed at which rotor 7 begins to float. m This indicates the maximum output pressure.

[0042] This method adjusts the current gradually based on equipment feedback, avoiding the impact of sudden current changes on rotor 7 and ensuring the stability of the operation process.

[0043] In an exemplary embodiment, the process of obtaining the excitation current potential table includes: Obtain the speed-pressure correspondence table for the air-suspended power equipment; Obtain the axial force corresponding to each working point in the speed-pressure correspondence table to obtain the axial force working condition table; Calculate the excitation current corresponding to each working point in the axial force working condition table to obtain the excitation current point table of the air suspension power equipment.

[0044] In one exemplary embodiment, obtaining the speed-pressure correspondence table of the air suspension power device includes: (1) Divide the rotational speed of the air suspension power equipment into n equal gears: N1, N2, ..., N n N1 to N n As the rotational speed gradually increases, N n This indicates the maximum rotational speed at which rotor 7 can float. (2) Divide the adjustable output pressure range of the fluid in the air suspension power equipment at each speed gear into P1, P2, P3, P4, P5, P6, P7, P8, P9, P1, P1, P1, P2, P1, P2, P1, P2, P3, P4, P5, P1, P2, P1, P2, P2, P3, P4, P5, P1, P2, P2, P2, P3, P4, 2、 …、P m There are m gears in total, P1 to P2. m The outlet pressure gradually increases, and the output pressure value is measured by the pressure transmitter. The number of outlet pressure settings can be determined based on experience; 5 to 8 settings can be selected. For example... Figure 4 As shown, the performance diagram of the air suspension power device was obtained by testing five outlet pressures at the same rotational speed.

[0045] Usually at a certain point [N] i P j Above, i.e., N i Rotational speed P j Under outlet pressure, the axial force varies very little within different temperature ranges; point [N] i P j All are within the surge line and overload line on the performance curve, indicating normal operation.

[0046] (3) As shown in Table 1, obtain the speed-pressure correspondence table of the air suspension power equipment.

[0047] Table 1 Rotational Speed-Pressure Correspondence Table

[0048] In an exemplary embodiment, obtaining the axial force corresponding to each operating point in the speed-pressure correspondence table to obtain an axial force operating condition table includes: The axial force corresponding to each operating point in the speed-pressure correspondence table is estimated using numerical calculation methods to obtain the axial force operating condition table. The numerical calculation method includes: statistically analyzing x identical air suspension power devices at (N...)... i ,P j Axial force under operating conditions, N i P represents the i-th rotational speed, where i = 1, 2, 3…n; j This represents the outlet pressure of the j-th gear, where j = 1, 2, 3…m; based on obtaining the average axial force. and minimum axial force F ijmin Obtain the estimated value of axial force s represents the safety coefficient summarized based on past experience, such that s∈(0,1); , .

[0049] The design, based on a safety factor s and a minimum axial force setting current value, enhances the system's adaptability and disturbance resistance under varying operating conditions and fluctuations.

[0050] Table 2 Axial Force Working Conditions

[0051] Alternatively, during the performance testing phase before the air suspension power equipment leaves the factory, the axial force is obtained through sensors to form an axial force condition table.

[0052] In one exemplary embodiment, as shown in Table 3, the axial force at each working point is obtained according to the axial force working condition table, and then... The excitation current was calculated. I ij This leads to the acquisition of the excitation current level table; C ij This indicates the clearance between the active axial magnetic bearing 9 and the thrust disk 10, where k represents a coefficient determined empirically.

[0053] Table 3 Excitation Current Point Table

[0054] In an exemplary embodiment, when the rotational speed is increased or the output pressure of the fluid section is increased according to actual operating conditions, the output current of the active axial magnetic bearing 9 is adjusted to the corresponding output current based on the excitation current level table; including: If the pressure is increased, the excitation current is gradually increased according to the closing time of the valve controlling the output pressure of the fluid section. I (N1,P m In other words, the valve closing time is the same as the excitation current adjustment time.

[0055] Alternatively, if the speed is increased, the excitation current can be gradually increased according to the speed adjustment time of the frequency converter. I (N n P1), that is, the speed adjustment time of the frequency converter is the same as the excitation current adjustment time.

[0056] The valve controls the output pressure of the fluid, and the frequency converter regulates the speed. The valve and frequency converter regulation times are settable. The current is gradually adjusted according to the valve closing time or the frequency converter's speed regulation time. Combined with the lookup table method, this effectively avoids sudden current surges and ensures stability throughout the entire process from startup to rated operation. This application provides an intelligent control strategy that combines closed-loop control based on equipment operating parameters with open-loop control based on preset tables.

[0057] In one exemplary embodiment, the control method further includes: If the operation of the magnetic levitation power equipment fluctuates, for any operating point G(N) a ,P b ), N i-1 <N a <N i ,P i-1 <N b <P i Then G(N) a ,P b The target excitation current is ( I i-1 ,P i-1 ).

[0058] The foregoing description illustrates and describes preferred embodiments of this application. However, as previously understood, this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the conception herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A sensorless magnetic-pneumatic hybrid bearing system, characterized in that, The system includes a front radial air foil bearing, an axial air foil bearing, and an active axial magnetic bearing. The front radial air foil bearing includes a front radial air foil bearing housing and a bottom foil, radial corrugated foil, and a bushing fitted inside it. The axial air foil bearing includes a front axial air foil bearing housing, a front axial corrugated foil assembly, a thrust disk, a rear axial corrugated foil assembly, and a rear axial air foil bearing housing. The rear axial air foil bearing housing is fitted radially outside the front radial air foil bearing housing, and an active axial magnetic bearing coil is wound within the space enclosed by the rear axial air foil bearing housing and the front radial air foil bearing housing to form the active axial magnetic bearing. The control method for the air-suspended power equipment based on the sensorless magnetic hybrid bearing system includes: Obtain the excitation current point table, including: (1) Divide the rotation speed of the air suspension power equipment into n levels, and divide the adjustable output pressure range of the fluid in the air suspension power equipment into m levels under each speed level, and obtain the speed-pressure correspondence table of the air suspension power equipment. (2) Estimate the axial force corresponding to each working point in the speed-pressure correspondence table by numerical calculation method to obtain the axial force working condition table; (3) Obtain the axial force at each working point according to the axial force working condition table, and then... The excitation current was calculated. I ij This leads to the acquisition of the excitation current level table; C ij This represents the clearance between the active axial magnetic bearing and the thrust disc, where k represents a coefficient determined empirically. Start the air levitation power equipment and accelerate to the minimum buoyancy speed N1; When the rotational speed of the air levitation power unit reaches the minimum buoyancy speed N1, based on the current minimum output pressure P1 of the air levitation power unit and in conjunction with the excitation current level table, the output current of the active axial magnetic bearing in the magnetic-air hybrid bearing system is adjusted to... I (N1,P1); When the rotational speed is increased or the output pressure of the fluid section is increased according to the actual working conditions, the output current of the active axial magnetic bearing is adjusted to the corresponding output current based on the excitation current level table. Once the air-suspended power equipment reaches its rated operating condition, adjust the output current of the active axial magnetic bearing to the target excitation current according to the excitation current level table. I (N n ,P m ), N n P represents the maximum rotational speed at which the rotor can float. m This indicates the maximum output pressure.

2. The sensorless magnetic-pneumatic hybrid bearing system according to claim 1, characterized in that, The front axial corrugated foil assembly / rear axial corrugated foil assembly includes a top foil and an axial corrugated foil. One end of the top foil and the axial corrugated foil is free, and the other end of the top foil and the axial corrugated foil are fixed together. The fixed end is fixed to the externally facing mounting surface of the rear axial air foil bearing housing. A magnetic field line passing ring is provided on the axial corrugated foil mounting surface of the rear axial air foil bearing housing.

3. The sensorless magnetic-pneumatic hybrid bearing system according to claim 2, characterized in that, The magnetic field lines pass through a ring filled with epoxy resin.

4. The sensorless magnetic-pneumatic hybrid bearing system according to claim 1, characterized in that, Numerical calculation methods include: statistically analyzing x identical models of air-suspended propulsion devices in (N) i ,P j Axial force under operating conditions, N i P represents the i-th rotational speed, where i = 1, 2, 3…n; j This represents the outlet pressure of the j-th gear, where j = 1, 2, 3…m; based on obtaining the average axial force. and minimum axial force F ijmin Obtain the estimated value of axial force s represents the safety factor summarized based on past experience, such that s∈(0,1); .

5. A sensorless magnetic-pneumatic hybrid bearing system according to claim 1, characterized in that, When the speed or pressure is increased according to actual working conditions, the output current of the active axial magnetic bearing is adjusted to the corresponding output current based on the excitation current level table; including: If the pressure is increased, the excitation current is gradually increased according to the closing time of the valve controlling the fluid output pressure. I (N1,P m ); Alternatively, if the speed is increased, the excitation current can be gradually increased according to the speed adjustment time of the frequency converter. I (N n ,P1).

6. An air-suspended power device based on the magnetic-pneumatic hybrid bearing system according to any one of claims 1-3, characterized in that, It includes a rotor and a stator. The rotor is fitted with a stator. The front end of the rotor is fitted with the magnetic-air hybrid bearing system and a fluid part. The fluid part includes a first working impeller. The first working impeller is fitted with a volute. The rear end of the rotor is fitted with a rear radial air foil bearing and a heat dissipation impeller.

Images