Magnetic suspension generator rotor vibration suppression device and method

Abstract

The invention provides a magnetic suspension generator rotor vibration suppression device and method, and belongs to the technical field of magnetic suspension generators, and the device comprises an electromagnetic bearing, a passive magnetic bearing and a damper; the electromagnetic bearing comprises an iron core and two coil assemblies, the iron core is installed on the outer wall of the rotor, and the two coil assemblies are arranged around the iron core; the passive magnetic bearing comprises an inner-ring permanent magnet and an outer-ring permanent magnet, the inner-ring permanent magnet is mounted on the outer wall of the rotor, the outer-ring permanent magnet is mounted on the inner wall of the generator shell, and the two corresponding permanent magnets have the same magnetism; the damper is installed on the generator and provided with a damping body and a stress sensor, one end of the rotor is connected to the damping body, and one end of the damping body is connected to the stress sensor. According to the magnetic suspension generator rotor vibration suppression device provided by the invention, by virtue of the radial and axial targeted suppression design, the out-of-control galloping of the rotor caused by excessive vibration is effectively avoided, and the operation stability and safety of the generator are guaranteed.

Description

Technical Field

[0001] This application belongs to the field of magnetic levitation generator technology, and more specifically, relates to a magnetic levitation generator rotor vibration suppression device and method. Background Technology

[0002] High-speed permanent magnet levitation power generation technology utilizes permanent magnets to generate a magnetic field, which suspends the main shaft in space, achieving speeds of tens of thousands of revolutions per minute. Because the rotor's magnetic field is provided by permanent magnets, no excitation current is required, resulting in no losses and higher efficiency. For the same power output, the motor is smaller and lighter, reducing the mechanical load on the rotor, allowing for very high speeds, exceeding 10,000 rpm. Furthermore, levitation in space offers advantages such as frictionless operation, no lubrication required, low power consumption, and clean, pollution-free operation, making it widely applicable in automobiles, flywheel energy storage, CNC machine tools, turbines, and other fields.

[0003] High-speed permanent magnet levitation generators utilize magnetic levitation to achieve contactless rotation, but they are susceptible to the impact of high-pressure steam during operation. The generator is highly prone to disturbances during operation, causing the rotor to vibrate radially and axially, affecting operational stability. If left uncontrolled, excessive vibration can cause the rotor to run away uncontrollably, damaging the generator. Summary of the Invention

[0004] The purpose of this application is to provide a magnetic levitation generator rotor vibration suppression device and method to solve the technical problem in the prior art that the generator is easily disturbed during operation, causing the rotor to vibrate in the radial and axial directions, which affects the operational stability.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a magnetic levitation generator rotor vibration suppression device, comprising an electromagnetic bearing, a passive magnetic bearing, and a damper; The electromagnetic bearing includes an iron core and two sets of coil assemblies. The iron core is fixedly installed on the outer wall of the rotor. The two sets of coil assemblies are arranged around the iron core and correspond to the iron core. The two sets of coil assemblies are spaced apart along the axial direction of the rotor. The passive magnetic bearing includes an inner ring permanent magnet and an outer ring permanent magnet. Multiple permanent magnets in the inner ring are mounted on the outer wall of the rotor and arranged in a ring around the rotor. Multiple permanent magnets in the outer ring are mounted on the inner wall of the generator housing and arranged around the inner ring permanent magnet. Each permanent magnet in the inner ring corresponds one-to-one with each permanent magnet in the outer ring, and the corresponding two permanent magnets have the same magnetism to generate a repulsive force. The damper is used for mounting on a generator and has a damping body and a stress sensor. One end of the rotor is rotatably connected to the damping body. The damping body has a degree of freedom to move along the rotor axis. The end of the damping body away from the rotor is connected to the stress sensor. The controller of the coil assembly is connected to the stress sensor.

[0006] In one possible implementation, the iron core is a cylindrical structure and is fitted onto the rotor; the electromagnetic bearing further includes two lock nuts, which are located on both sides of the iron core and fixedly connected to the rotor to define the installation position of the iron core.

[0007] In one possible implementation, the electromagnetic bearing further includes a housing and a barrier steel plate mounted in the housing, with both sets of coil assemblies mounted inside the housing and located on opposite sides of the barrier steel plate.

[0008] In one possible implementation, the electromagnetic bearing and the damper are located at both ends of the rotor, and the passive magnetic bearing is located between the electromagnetic bearing and the damper.

[0009] In one possible implementation, the damping body is provided with a mounting groove, a bearing cup installed in the mounting groove, and bearing oil filled in the bearing cup; one end of the rotor has a ball head rotatably connected to the bearing cup.

[0010] In one possible implementation, a plurality of spiral grooves are formed on the outer surface of the ball head.

[0011] In one possible implementation, the damper includes a base and an outer sleeve fixedly mounted on the base, the damping body is installed in the outer sleeve and slidably connected to the outer sleeve; a movable chamber is formed between the lower end of the damping body and the inner wall of the outer sleeve, the movable chamber being filled with damping oil; and the stress sensor is mounted on the base.

[0012] In one possible implementation, the lower end of the damping body is further provided with a plurality of support pillars located in the active chamber, and the plurality of support pillars are arranged in a ring; the number of stress sensors is plurality of, and each of the plurality of support pillars corresponds one-to-one; the lower end of the support pillar is connected to the stress sensor.

[0013] In one possible implementation, the base is provided with a connecting ring, and a plurality of stress sensors are evenly arranged on the connecting ring; the lower end of the support column passes through the corresponding stress sensor and is fixedly connected to the connecting ring.

[0014] The beneficial effects of the magnetic levitation generator rotor vibration suppression device provided in this application are as follows: Compared with the prior art, the magnetic levitation generator rotor vibration suppression device of this application constructs an all-round vibration suppression system through the coordinated cooperation of electromagnetic bearings, passive magnetic bearings and dampers, so as to solve the problem of rotor radial and axial vibration. The electromagnetic bearing, as the core component for active axial vibration suppression, consists of an iron core and two sets of axially spaced coil assemblies. The iron core is fixed to the outer wall of the rotor, and the two sets of coil assemblies are arranged around the iron core. By energizing, a controllable magnetic field can be generated to apply an axial corrective force to the rotor. The passive magnetic bearing focuses on radial vibration suppression and adopts a repulsive cooperation structure between inner and outer permanent magnets. Multiple inner permanent magnets are ring-mounted on the outer wall of the rotor, and multiple outer permanent magnets are correspondingly ring-mounted on the inner wall of the generator housing. The relative permanent magnets have the same magnetism, and the radial elastic constraint is formed by the magnetic repulsion property of like poles. The damper has both preliminary axial vibration buffering and signal acquisition functions. Its damping body is rotatably connected to one end of the rotor and can move along the axial direction. The end away from the rotor is connected to the stress sensor. At the same time, the controller of the coil assembly establishes signal transmission with the stress sensor to realize real-time acquisition of vibration signals and rapid response to suppression commands.

[0015] During installation, the core of the electromagnetic bearing is fixed to the outer wall of the rotor, ensuring that the two sets of coil assemblies are precisely aligned around the core and spaced apart axially. Simultaneously, the two sets of coil assemblies are connected to the controller. When installing the passive magnetic bearing, the inner ring permanent magnet is fixed to the corresponding position on the outer wall of the rotor, and the outer ring permanent magnet is correspondingly installed on the inner wall of the generator housing, ensuring that the inner and outer ring permanent magnets correspond one-to-one and have the same magnetism. When installing the damper, one end of the rotor is rotatably connected to the damper body, ensuring that the damper body has axial movement freedom. The other end of the damper body is connected to the stress sensor, completing the signal link between the stress sensor and the coil assembly controller.

[0016] In practical operation, the generator is started, and the device enters the working state synchronously with the generator. During operation, when the rotor is disturbed and causes axial movement, it will directly drive the damping body to move synchronously along the axial direction. The damping body first generates a resistance force to the axial movement of the rotor through its own damping characteristics, realizing the initial buffering of axial vibration. At the same time, the movement of the damping body will exert pressure on the stress sensor. The stress sensor quickly transmits the collected axial vibration signal to the coil assembly controller. The controller quickly analyzes the signal and controls the corresponding coil assembly to connect the circuit. After being energized, the coil assembly generates a directional magnetic field that acts on the iron core of the rotor's outer wall, applying a reverse correction force to the rotor and driving the rotor to move back to its original position, realizing precise active suppression of axial vibration. When the rotor generates radial vibration, the inner ring permanent magnet of the passive magnetic bearing is synchronously offset radially with the rotor. At this time, the outer ring permanent magnet, which corresponds one-to-one with the inner ring permanent magnet, generates a reverse repulsive force due to the like-pole repulsion characteristic. This repulsive force will increase with the increase of the radial offset, forming an adaptive radial constraint, quickly canceling the radial vibration of the rotor, pulling the rotor back to its original radial position, and finally realizing dual stability control of the rotor in both radial and axial directions.

[0017] In this way, by employing targeted radial and axial suppression designs, the rotor vibration problem is solved, effectively preventing rotor runaway caused by excessive vibration and ensuring the generator's operational stability and safety. Furthermore, by adopting a synergistic mode of passive constraint and active suppression, the passive magnetic bearing achieves continuous suppression of radial vibration without additional energy consumption, aligning with the core advantages of high-speed permanent magnet levitation generators: lossless operation and high efficiency. The electromagnetic bearing is only energized as needed when axial vibration occurs to adjust the rotor's axial position. The damper's buffering effect, combined with real-time signal transmission from stress sensors, achieves precise and rapid vibration suppression.

[0018] Another objective of this application is to provide a method for suppressing rotor vibration of a magnetic levitation generator, employing any of the aforementioned magnetic levitation generator rotor vibration suppression devices, including: when the rotor undergoes axial movement, it drives the damping body on the damper to move, the damping body generates resistance to the axial movement of the rotor, and the damping body acts on a stress sensor; the controller of the coil assembly receives the signal from the stress sensor and controls the corresponding coil assembly connection circuit; after the coil assembly is energized, it generates a magnetic field that acts on the iron core to drive the rotor to move toward its original position; the repulsive force between the inner ring permanent magnet on the rotor and the outer ring permanent magnet on the generator housing cancels the radial vibration of the rotor, so that the rotor remains in its original position.

[0019] The rotor vibration suppression method for magnetic levitation generators provided in this application employs a rotor vibration suppression device. Through targeted radial and axial suppression designs, it solves the rotor vibration problem, effectively preventing rotor runaway due to excessive vibration and ensuring the generator's operational stability and safety. Furthermore, it adopts a synergistic mode of passive constraint and active suppression. The passive magnetic bearing achieves continuous suppression of radial vibration without additional energy consumption, aligning with the core advantages of high-speed permanent magnet magnetic levitation generators: lossless operation and high efficiency. The electromagnetic bearing is energized only as needed when axial vibration occurs to adjust the rotor's axial position. The damper's buffering effect combined with the real-time signal transmission from the stress sensor achieves precise and rapid vibration suppression. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the magnetic levitation generator rotor vibration suppression device provided in the embodiments of this application; Figure 2 This is a schematic diagram of the installation of the inner and outer permanent magnets provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the damper provided in the embodiments of this application; Figure 4 This is a schematic diagram showing the connection between the ball head and the bearing cup in an embodiment of this application.

[0022] The following are the labeling elements in the figure: 10. Electromagnetic bearing; 11. Iron core; 12. Coil assembly; 13. Lock nut; 14. Housing; 15. Barrier steel plate; 20. Passive magnetic bearing; 21. Inner ring permanent magnet; 22. Outer ring permanent magnet; 30. Damper; 31. Damper body; 32. Stress sensor; 33. Mounting groove; 34. Bearing cup; 35. Bearing oil; 40. Base; 41. Outer sleeve; 42. Movable chamber; 43. Damping oil; 44. Support column; 45. Connecting ring; 50. Rotor; 51. Ball head; 52. Helical groove. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] Please see Figures 1 to 3 The vibration suppression device for a magnetic levitation generator rotor provided in this application will now be described. A vibration suppression device for a magnetic levitation generator rotor includes an electromagnetic bearing 10, a passive magnetic bearing 20, and a damper 30; The electromagnetic bearing 10 includes an iron core 11 and two sets of coil assemblies 12. The iron core 11 is used to be fixedly installed on the outer wall of the rotor 50. The two sets of coil assemblies 12 are arranged around the iron core 11 and correspond to the iron core 11. The two sets of coil assemblies 12 are spaced apart along the axial direction of the rotor 50. The passive magnetic bearing 20 includes an inner ring permanent magnet 21 and an outer ring permanent magnet 22. Multiple permanent magnets in the inner ring permanent magnet 21 are mounted on the outer wall of the rotor 50 and arranged in a ring around the rotor 50. Multiple permanent magnets in the outer ring permanent magnet 22 are mounted on the inner wall of the generator housing and arranged around the inner ring permanent magnet 21. The multiple permanent magnets in the inner ring permanent magnet 21 correspond one-to-one with the multiple permanent magnets in the outer ring permanent magnet 22, and the corresponding two permanent magnets have the same magnetism to generate a repulsive force. The damper 30 is used to be installed on the generator and has a damping body 31 and a stress sensor 32. One end of the rotor 50 is rotatably connected to the damping body 31. The damping body 31 has a degree of freedom to move along the axial direction of the rotor 50. The end of the damping body 31 away from the rotor 50 is connected to the stress sensor 32. The controller of the coil assembly 12 is connected to the stress sensor 32.

[0028] The magnetic levitation generator rotor vibration suppression device provided in this application, compared with the prior art, constructs an all-round vibration suppression system through the coordinated cooperation of electromagnetic bearing 10, passive magnetic bearing 20 and damper 30, and solves the radial and axial vibration problems of rotor 50. The electromagnetic bearing 10, as the core component for active axial vibration suppression, consists of an iron core 11 and two sets of axially spaced coil assemblies 12. The iron core 11 is fixed to the outer wall of the rotor 50, and the two sets of coil assemblies 12 are arranged around the iron core 11. It can generate a controllable magnetic field to apply an axial correction force to the rotor 50 by energizing it. The passive magnetic bearing 20 focuses on radial vibration suppression and adopts a repulsive cooperation structure between the inner ring permanent magnet 21 and the outer ring permanent magnet 22. Multiple permanent magnets in the inner ring are installed in a ring on the outer wall of the rotor 50, and multiple permanent magnets in the outer ring are installed in a corresponding ring on the inner wall of the generator housing. The relative permanent magnets have the same magnetism, and the radial elastic constraint is formed by the magnetic repulsion of like poles. The damper 30 has both the function of preliminary axial vibration buffering and signal acquisition. Its damping body 31 is rotatably connected to one end of the rotor 50 and can move along the axial direction. The end away from the rotor 50 is connected to the stress sensor 32. At the same time, the controller of the coil assembly 12 establishes signal transmission with the stress sensor 32 to realize real-time acquisition of vibration signals and rapid response to suppression commands.

[0029] During installation, the iron core 11 of the electromagnetic bearing 10 is fixed to the outer wall of the rotor 50, ensuring that the two sets of coil assemblies 12 are precisely aligned around the iron core 11 and spaced apart along the axial direction. At the same time, the two sets of coil assemblies 12 are connected to the controller. When installing the passive magnetic bearing 20, the inner ring permanent magnet 21 is fixed in a ring at the corresponding position on the outer wall of the rotor 50, and the outer ring permanent magnet 22 is installed in a ring on the inner wall of the generator housing, ensuring that the inner ring permanent magnet 21 and the outer ring permanent magnet 22 correspond one-to-one and have the same magnetism. When installing the damper 30, one end of the rotor 50 is rotatably connected to the damping body 31 to ensure that the damping body 31 has axial movement freedom, and the other end of the damping body 31 is connected to the stress sensor 32, completing the signal link between the stress sensor 32 and the controller of the coil assembly 12.

[0030] In specific operation, the generator is started, and the device enters the working state synchronously with the generator. During operation, when the rotor 50 is disturbed and causes axial movement, it will directly drive the damping body 31 to move synchronously along the axial direction. The damping body 31 first generates a resistance force on the axial movement of the rotor 50 through its own damping characteristics, realizing the initial buffering of axial vibration. At the same time, the movement of the damping body 31 will exert pressure on the stress sensor 32. The stress sensor 32 quickly transmits the collected axial vibration signal to the coil assembly 12 controller. The controller quickly analyzes the signal and controls the corresponding coil assembly 12 to connect the circuit. After being energized, the coil assembly 12 generates a directional magnetic field that acts on the iron core of the outer wall of the rotor 50. 11. Apply a reverse correction force to the rotor 50 to drive the rotor 50 to move toward its original position, thereby achieving precise active suppression of axial vibration. When the rotor 50 generates radial vibration, the inner ring permanent magnet 21 of the passive magnetic bearing 20 is synchronously radially offset with the rotor 50. At this time, the outer ring permanent magnet 22, which corresponds one-to-one with the inner ring permanent magnet 21, generates a reverse repulsive force due to the repulsive property of like poles. This repulsive force will increase with the increase of the radial offset, forming an adaptive radial constraint, which quickly cancels the radial vibration of the rotor 50, pulls the rotor 50 back to its original radial position, and finally achieves dual stability control of the rotor 50 in both the radial and axial directions.

[0031] In this way, by employing targeted radial and axial suppression designs, the vibration problem of rotor 50 is solved, effectively preventing runaway rotor 50 caused by excessive vibration and ensuring the operational stability and safety of the generator. Furthermore, by adopting a synergistic mode of passive constraint and active suppression, the passive magnetic bearing 20 can achieve continuous suppression of radial vibration without additional energy consumption, aligning with the core advantages of high-speed permanent magnet levitation generators: lossless operation and high efficiency. The electromagnetic bearing 10 is only energized as needed when axial vibration occurs to adjust the axial position of rotor 50. The buffering effect of the damper 30, combined with the real-time signal transmission of the stress sensor 32, achieves precise and rapid vibration suppression.

[0032] Please see Figure 1 As a specific embodiment of the magnetic levitation generator rotor vibration suppression device provided in this application, the iron core 11 has a cylindrical structure and is fitted onto the rotor 50; the electromagnetic bearing 10 also includes two locking nuts 13, which are located on both sides of the iron core 11 and are fixedly connected to the rotor 50 to limit the installation position of the iron core 11; by optimizing the structure and fixing method of the electromagnetic bearing 10 and the iron core 11 to meet the vibration suppression requirements, the cylindrical iron core 11 fitted onto the rotor 50 is more likely to fit precisely with the rotor 50, which can make the magnetic field generated by the coil assembly 12 act uniformly on the iron core 11 and improve the stability of the axial correction force.

[0033] The locking nuts 13 on both sides are fixedly connected to the rotor 50, which can precisely limit the axial position of the iron core 11 and prevent the iron core 11 from shifting and affecting the magnetic field effect. During operation, first, the cylindrical iron core 11 is coaxially fitted into the preset position of the rotor 50, then the two locking nuts 13 are respectively fitted into the rotor 50 and placed on both sides of the iron core 11, and the locking nuts 13 are tightened to complete the fixation. Finally, ensure that the coil assembly 12 is precisely aligned with the iron core 11. This set-type structure simplifies the installation process, and the fixing of the locking nuts 13 ensures the stability of the iron core 11 position, avoiding vibration suppression failure caused by the iron core 11 shifting during high-speed operation.

[0034] Please see Figure 1 As a specific embodiment of the magnetic levitation generator rotor vibration suppression device provided in this application, the electromagnetic bearing 10 also includes a housing 14 and a barrier steel plate 15 installed in the housing 14. Both sets of coil assemblies 12 are installed inside the housing 14 and are located on both sides of the barrier steel plate 15, respectively. By adding a housing 14 and a barrier steel plate 15 to the electromagnetic bearing 10, the structural stability is optimized. The housing 14 provides an installation carrier and protection for the coil assemblies 12. The barrier steel plate 15, installed inside the housing 14, separates the two sets of coil assemblies 12 on both sides, which can effectively avoid mutual interference of the magnetic fields generated after the two sets of coils are energized, and ensure the accuracy of the magnetic field action. The housing 14 can reduce the impact of external dust and vibration on the coils, and the barrier steel plate 15 eliminates the problem of magnetic field mutual interference and improves the control accuracy of the axial correction force. Modular assembly simplifies the installation process and further ensures the operational stability and reliability of the device under high-speed conditions.

[0035] Both coil assemblies 12 are formed by winding excitation coils with the same number of turns and winding direction, and each coil assembly 12 is externally connected to a programmable power supply. Preferably, the coil assembly 12 is connected to a PID control system, which adjusts the current of the coil assembly 12 in a timely manner according to the changes in the value of the stress sensor 32, controlling the stress to maintain the initial value. In this way, the rotor 50 can always be controlled in the initial position, effectively reducing the axial vibration of the rotor 50. When power is supplied to one of the coil assemblies 12, the coil assembly 12 passing through the current will generate a magnetic field. Under the action of the magnetic field, the iron core 11 on the rotor 50 will be controlled to tend towards the center position of the coil. The larger the current, the stronger the magnetic field and the greater the magnetic force. Under the action of the magnetic force, the iron core 11 will generate an upward or downward force, thereby driving the rotor 50 to move upward or downward. By adjusting the magnitude of the current, the axial position of the rotor 50 can be controlled.

[0036] Please see Figure 1As a specific embodiment of the magnetic levitation generator rotor vibration suppression device provided in this application, the electromagnetic bearing 10 and the damper 30 are located at both ends of the rotor 50, and the passive magnetic bearing 20 is located between the electromagnetic bearing 10 and the damper 30. By optimizing the spatial layout of the electromagnetic bearing 10, the damper 30 and the passive magnetic bearing 20 to meet the vibration suppression requirements, the electromagnetic bearing 10 responsible for axial vibration suppression and the damper 30, which also has the functions of buffering and signal acquisition, are placed at both ends of the rotor 50, so that the axial correction force and buffering force can be applied evenly from both ends of the rotor 50, thereby improving the axial stability control effect. The passive magnetic bearing 20 responsible for radial vibration suppression is located between the two, which can form a precise constraint on the core vibration area in the middle section of the rotor 50, thereby achieving radial stability coverage of the entire rotor 50.

[0037] This layout with two ends and a middle allows the working areas of each component to complement each other, evenly distributing the force on rotor 50 and avoiding localized stress concentration; it improves the comprehensiveness and accuracy of vibration suppression, further ensuring the stability of rotor 50 during high-speed operation.

[0038] Please see Figure 1 and Figure 3 As a specific embodiment of the magnetic levitation generator rotor vibration suppression device provided in this application, the damping body 31 is provided with an installation groove 33, a bearing cup 34 installed in the installation groove 33, and bearing oil 35 filled in the bearing cup 34; one end of the rotor 50 has a ball head 51 rotatably connected in the bearing cup 34; the installation groove 33 provided by the damping body 31 provides precise installation positioning for the bearing cup 34, the bearing oil 35 filled in the bearing cup 34 can enhance the lubrication and buffering effect, and the ball head 51 at one end of the rotor 50 is rotatably connected in the bearing cup 34, so as to realize the flexible adaptation of the rotation and axial movement of the rotor 50, while ensuring the stable transmission of vibration signals.

[0039] During installation, first, the bearing cup 34 is inserted into the mounting groove 33 of the damping body 31 and fixed. An appropriate amount of bearing oil 35 is then filled into the bearing cup 34. Next, the ball head 51 at one end of the rotor 50 is inserted into the bearing cup 34 to complete the rotational connection. Finally, the damping body 31 and the stress sensor 32 are assembled, and the signal link is tested. The bearing oil 35 enhances lubrication and reduces friction loss. The fit between the ball head 51 and the bearing cup 34 ensures smooth transmission and prevents jamming during axial vibration transmission. The precise installation structure improves the assembly accuracy of the damper 30, enhancing the reliability of axial buffering and the accuracy of signal acquisition.

[0040] Please see Figure 1 , Figure 3 and Figure 4As a specific embodiment of the magnetic levitation generator rotor vibration suppression device provided in this application, a plurality of spiral grooves 52 are formed on the outer surface of the ball head 51. The spiral grooves 52 on the outer surface of the ball head 51 of the rotor 50 optimize the transmission and lubrication effect. The spiral grooves 52 can store bearing oil 35 in the bearing cup 34, forming a continuous lubricating oil film, while adapting to the relative rotation of the ball head 51 and the bearing cup 34, avoiding insufficient lubrication or jamming during vibration transmission. The spiral grooves 52 improve lubrication continuity, reduce frictional loss between the ball head 51 and the bearing cup 34, and enhance the smoothness of vibration transmission.

[0041] When the rotor 50 rotates at high speed, the bearing oil 35 is carried into the gap between the ball head 51 and the bearing cup 34. As the rotor 50 moves, the gap between the oil film between the ball head 51 and the bearing cup 34 gradually decreases, and the oil film is continuously compressed, thereby generating a hydrodynamic pressure film with a certain rigidity, which makes the rotor 50 suspend and not directly contact the bearing cup 34. This method has the advantages of reducing frictional resistance, improving bearing service life, and reducing wear between bearings.

[0042] When the rotor 50 drives the ball head 51 to rotate at high speed in the bearing cup 34, the damping body 31 will also move. However, since the outer wall gap is filled with damping oil 43, the damping oil 43 will generate pressure when squeezed. The pressure in the oil inhibits the movement of the damping body 31, which can effectively reduce vibration. This method can withstand radial load and axial load at the same time, ensuring the stability of the rotor 50 when the generator is running.

[0043] Please see Figure 1 and Figure 3 As a specific embodiment of the magnetic levitation generator rotor vibration suppression device provided in this application, the damper 30 includes a base 40 and an outer sleeve 41 fixedly installed on the base 40. The damping body 31 is installed in the outer sleeve 41 and is slidably connected to the outer sleeve 41. There is a movable chamber 42 between the lower end of the damping body 31 and the inner wall of the outer sleeve 41, and the movable chamber 42 is filled with damping oil 43. The stress sensor 32 is installed on the base 40. By optimizing the overall structure of the damper 30, the stability of axial vibration buffering and signal acquisition is improved. The base 40 provides a stable mounting carrier for the outer sleeve 41 and the stress sensor 32. The outer sleeve 41 forms a guiding constraint on the damping body 31, ensuring that the damping body 31 slides smoothly only along the axial direction. The movable chamber 42 formed by the lower end of the damping body 31 and the inner wall of the outer sleeve 41 and the damping oil 43 filled inside can further enhance the axial buffering effect through oil damping, and achieve accurate acquisition of vibration signals in conjunction with the stress sensor 32.

[0044] The base 40 and outer sleeve 41 enhance the overall rigidity of the damper 30, preventing structural displacement under high-speed vibration; damping oil 43 enhances the buffering and damping effect, reducing vibration impact; sliding guides ensure smooth axial displacement and improve the signal acquisition accuracy of the stress sensor 32. A sealing ring is provided at the connection between the base 40 and the outer sleeve 41.

[0045] Please see Figure 1 and Figure 3 As a specific embodiment of the magnetic levitation generator rotor vibration suppression device provided in this application, the lower end of the damping body 31 is also provided with multiple support columns 44 located in the movable chamber 42, and the multiple support columns 44 are arranged in a ring; the number of stress sensors 32 is multiple, and they correspond one-to-one with the multiple support columns 44; the lower end of the support column 44 is connected to the stress sensor 32. Based on the structure of the base 40, the outer sleeve 41 and the movable chamber 42, by adding the ring-arranged support columns 44 and the one-to-one corresponding multiple stress sensors 32, the axial force transmission and vibration signal acquisition effect are optimized.

[0046] The support pillar 44 is located at the lower end of the damping body 31 and within the movable chamber 42. It does not affect the buffering effect of the damping oil 43, and it can evenly transmit the axial vibration force borne by the damping body 31 to the corresponding stress sensor 32. Multiple stress sensors 32 are installed on the base 40 in a one-to-one correspondence with the support pillar 44, enabling multi-point synchronous signal acquisition and improving signal accuracy. The ring-shaped arrangement of multiple support pillars 44 ensures even distribution of axial force, avoiding localized stress concentration that could damage components. Synchronous acquisition by multiple sensors improves the comprehensiveness and accuracy of vibration signal capture, helping the controller to quickly and accurately output correction commands. The structural design is compatible with the original damping oil 43's buffering function, further enhancing the stability and reliability of axial vibration suppression.

[0047] Please see Figure 1 and Figure 3 As a specific embodiment of the magnetic levitation generator rotor vibration suppression device provided in this application, a connecting ring 45 is provided on the base 40, and multiple stress sensors 32 are evenly arranged on the connecting ring 45; the lower end of the support column 44 passes through the corresponding stress sensor 32 and is fixedly connected to the connecting ring 45; the addition of the connecting ring 45 to the base 40 optimizes the installation and force transmission effect of the stress sensor 32, the connecting ring 45 provides a uniformly arranged carrier for multiple stress sensors 32, and the lower end of the support column 44 passes through the corresponding sensor and is fixed to the connecting ring 45, which can stably transmit axial force and ensure the balanced force on the sensor. In this way, the installation accuracy and force stability of the stress sensor 32 are improved, the vibration signal acquisition is accurate, the reliability of axial vibration suppression is enhanced, and the assembly process is simplified.

[0048] Not shown in the figure, this application embodiment also provides a method for suppressing rotor vibration of a magnetic levitation generator. The method for suppressing rotor vibration of a magnetic levitation generator adopts any of the above-mentioned magnetic levitation generator rotor vibration suppression devices, including: when the rotor 50 moves axially, it drives the damping body 31 on the damper 30 to move. The damping body 31 generates resistance to the axial movement of the rotor 50, and the damping body 31 acts on the stress sensor 32. The controller of the coil assembly 12 receives the signal from the stress sensor 32 and controls the corresponding coil assembly 12 to connect to the circuit. After the coil assembly 12 is energized, it generates a magnetic field that acts on the iron core 11 to drive the rotor 50 to move toward its original position. The repulsive force between the inner ring permanent magnet 21 on the rotor 50 and the outer ring permanent magnet 22 on the generator housing cancels the radial vibration of the rotor 50, so that the rotor 50 remains in its original position.

[0049] The magnetic levitation generator rotor vibration suppression method provided in this application embodiment employs the aforementioned magnetic levitation generator rotor vibration suppression device. Through targeted radial and axial suppression designs, it solves the rotor 50 vibration problem, effectively preventing excessive vibration from causing the rotor 50 to run away uncontrollably, thus ensuring the generator's operational stability and safety. Furthermore, by adopting a synergistic mode of passive constraint and active suppression, the passive magnetic bearing 20 can achieve continuous suppression of radial vibration without additional energy consumption, aligning with the core advantages of high-speed permanent magnet magnetic levitation generators: lossless operation and high efficiency. The electromagnetic bearing 10 is only energized as needed when axial vibration occurs to adjust the axial position of the rotor 50. The damping effect of the damper 30, combined with the real-time signal transmission of the stress sensor 32, achieves precise and rapid vibration suppression.

[0050] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A magnetic levitation generator rotor vibration suppression device, characterized in that, This includes electromagnetic bearings, passive magnetic bearings, and dampers; The electromagnetic bearing includes an iron core and two sets of coil assemblies. The iron core is fixedly installed on the outer wall of the rotor. The two sets of coil assemblies are arranged around the iron core and correspond to the iron core. The two sets of coil assemblies are spaced apart along the axial direction of the rotor. The passive magnetic bearing includes an inner ring permanent magnet and an outer ring permanent magnet. Multiple permanent magnets in the inner ring are mounted on the outer wall of the rotor and arranged in a ring around the rotor. Multiple permanent magnets in the outer ring are mounted on the inner wall of the generator housing and arranged around the inner ring permanent magnet. Each permanent magnet in the inner ring corresponds one-to-one with each permanent magnet in the outer ring, and the corresponding two permanent magnets have the same magnetism to generate a repulsive force. The damper is used for mounting on a generator and has a damping body and a stress sensor. One end of the rotor is rotatably connected to the damping body. The damping body has a degree of freedom to move along the rotor axis. The end of the damping body away from the rotor is connected to the stress sensor. The controller of the coil assembly is connected to the stress sensor.

2. The magnetic levitation generator rotor vibration suppression device as described in claim 1, characterized in that, The iron core has a cylindrical structure and is fitted onto the rotor; the electromagnetic bearing also includes two lock nuts, which are located on both sides of the iron core and are fixedly connected to the rotor to define the installation position of the iron core.

3. The magnetic levitation generator rotor vibration suppression device as described in claim 1, characterized in that, The electromagnetic bearing also includes a housing and a barrier steel plate installed in the housing. Both sets of coil assemblies are installed in the housing and are located on both sides of the barrier steel plate.

4. The magnetic levitation generator rotor vibration suppression device as described in claim 1, characterized in that, The electromagnetic bearing and the damper are located at both ends of the rotor, and the passive magnetic bearing is located between the electromagnetic bearing and the damper.

5. The magnetic levitation generator rotor vibration suppression device as described in claim 1, characterized in that, The damping body is provided with a mounting groove, a bearing cup installed in the mounting groove, and bearing oil filled in the bearing cup; one end of the rotor has a ball head rotatably connected to the bearing cup.

6. The magnetic levitation generator rotor vibration suppression device as described in claim 5, characterized in that, Several spiral grooves are formed on the outer surface of the ball head.

7. The magnetic levitation generator rotor vibration suppression device as described in claim 1, characterized in that, The damper includes a base and an outer sleeve fixedly mounted on the base. The damping body is installed in the outer sleeve and is slidably connected to the outer sleeve. There is a movable chamber between the lower end of the damping body and the inner wall of the outer sleeve, and the movable chamber is filled with damping oil. The stress sensor is mounted on the base.

8. The magnetic levitation generator rotor vibration suppression device as described in claim 7, characterized in that, The lower end of the damping body is also provided with a plurality of support pillars located in the active chamber, and the plurality of support pillars are arranged in a ring; there are a plurality of stress sensors, and each of the plurality of support pillars corresponds one-to-one; the lower end of the support pillar is connected to the stress sensor.

9. The magnetic levitation generator rotor vibration suppression device as described in claim 8, characterized in that, The base is provided with a connecting ring, and a plurality of stress sensors are evenly arranged on the connecting ring; the lower end of the support column passes through the corresponding stress sensor and is fixedly connected to the connecting ring.

10. A method for suppressing rotor vibration of a magnetic levitation generator, characterized in that, The magnetic levitation generator rotor vibration suppression device as described in any one of claims 1-9 includes the following: when the rotor moves axially, it drives the damping body on the damper to move, the damping body generates resistance to the axial movement of the rotor, and the damping body acts on the stress sensor; the controller of the coil assembly receives the signal from the stress sensor and controls the corresponding coil assembly connection circuit; after the coil assembly is energized, it generates a magnetic field that acts on the iron core to drive the rotor to move toward its original position; the repulsive force between the inner ring permanent magnet on the rotor and the outer ring permanent magnet on the generator housing cancels the radial vibration of the rotor, so that the rotor remains in its original position.

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