A high-speed low-vibration magnetic levitation power generation system

Abstract

This invention discloses a high-speed, low-vibration magnetic levitation power generation system, belonging to the field of power generation technology. The system mainly consists of a frame, generator, external drive unit, flexible coupling, bearing control mechanism, and cooling pipe assembly. It employs a multi-source sensor array and feedforward control to achieve bidirectional active vibration suppression between the system and the external environment; the flexible coupling decouples the external drive unit from the generator rotor dynamics; and the cooling pipe assembly, combined with a rigid support and spherical compensator, simultaneously achieves vibration transmission blocking and pipe thermal displacement compensation. This invention solves the pain points of existing magnetic levitation power generation systems, such as weak integration adaptability, inability to coordinate internal and external vibration suppression, and the impact of pipe vibration and thermal displacement on operational reliability. It features high integration and power density, excellent vibration reduction across the entire frequency band, and is suitable for high-speed, high-capacity, low-vibration applications such as shipbuilding and precision manufacturing.

Description

Technical Field

[0001] This invention relates to the field of generator technology, and more specifically to a high-speed, low-vibration magnetic levitation power generation system. Background Technology

[0002] High-speed generators are core equipment for achieving efficient energy conversion and are widely used in renewable energy, distributed energy, and industrial waste heat recovery. To improve power density, generators often operate at high speeds of thousands to tens of thousands of revolutions per minute, which places extremely high demands on the rotor support system. Traditional oil-lubricated mechanical bearings are difficult to adapt due to high frictional losses and the need for complex oil circuit systems; magnetic levitation bearings, with their advantages of non-contact support, low losses, and actively adjustable stiffness / damping, have become the ideal choice for high-speed generators and have also laid the foundation for system vibration reduction and noise reduction.

[0003] However, applying magnetic bearings to high-speed generators still faces a series of pressing technical challenges: First, structural integration and drive adaptation are difficult. Magnetic bearings have limited load-bearing capacity, and their main body and auxiliary components are relatively large, making integrated integration with the stator and rotor within the compact space of the generator challenging, easily leading to increased axial length and reduced power density. Furthermore, high-speed generators employ diverse types of prime movers with varying output characteristics and interfaces; rigid direct connection can easily cause dynamic coupling in the rotor system, triggering bending modal resonance or even instability. Achieving compact, modular integration and dynamic decoupling is the primary challenge. Second, existing magnetic bearing vibration control has limitations. Current control strategies focus only on the rotor's own stable levitation, while in reality, vibration energy can be transmitted outward through the motor frame and feet, and external environmental vibrations can also interfere with air gap stability. Existing strategies are ineffective in addressing this, making it difficult to meet the stringent requirements of precision machining and ship stealth applications. A global active vibration reduction method urgently needs breakthrough. Third, pipeline vibration and thermal displacement compensation in the generator cooling system are also key factors affecting reliability. High-speed generators generate a large amount of heat during operation. The key electromagnetic properties of magnetic levitation bearings are sensitive to temperature. High temperatures can lead to a decrease in their load-bearing capacity and control accuracy, requiring a water-cooling system. However, cooler vibration can be transmitted to the stator through the pipeline, interfering with air gap stability. Thermal expansion and contraction of the pipeline can easily generate thermal stress and forced displacement, threatening structural safety. Balancing cooling effect with vibration and thermal displacement control is a core technical challenge.

[0004] In view of this, it is necessary to study a high-speed, low-vibration magnetic levitation power generation system that has high integration, can be adapted to multiple drive sources, and can suppress its own vibration and external excitation transmission, as well as achieve efficient cooling and thermal displacement compensation through active control. Summary of the Invention

[0005] In view of the technical problems existing in the background art, the present invention provides a high-speed, low-vibration magnetic levitation power generation system, which aims to solve the problems of structural integration difficulties, poor adaptability, vibration transmission and external vibration interference that exist when magnetic levitation bearings are used in current high-speed generators. It is suitable for high-speed, large-capacity, low-vibration applications and has the characteristics of simple system composition, high integration, high reliability and low vibration noise during equipment operation.

[0006] In a first aspect, embodiments of the present invention provide a high-speed, low-vibration magnetic levitation power generation system, comprising: A generator, comprising a generator stator and a generator rotor shaft supported within the generator stator by magnetic levitation bearings; The generator cooling pipe assembly includes a cooler disposed on the generator stator, the cooler being connected to the cooling water channel inside the generator stator through an internal circulation pipe and connected to an external cooling system through an external circulation pipe; A vibration sensor array is distributed at at least two different vibration transmission path monitoring nodes in the system to sense vibration signals from different sources and / or different transmission directions; The bearing control mechanism includes a feedforward controller; the input and output terminals of the feedforward controller are electrically connected to the output terminal of the vibration sensor array and the magnetic levitation bearing, respectively, so that the input current of the magnetic levitation bearing is a feedforward current generated based on the vibration signal of the vibration sensor array.

[0007] As a further improvement of the present invention, the vibration sensor array includes at least: The first set of vibration sensor arrays is arranged on the bearing housing of the magnetic levitation bearing; The second set of vibration sensor arrays is arranged on the mechanical connection path between the system and the external mounting surface, as well as on the external pipeline connection of the generator; The bearing control mechanism is configured as follows: Receive the vibration signal collected by the first group of vibration sensor arrays and generate the first feedforward current; The vibration signal collected by the second set of vibration sensor arrays is received, and a second feedforward current is generated; The first feedforward current and the second feedforward current are superimposed and used as the input current of the magnetic levitation bearing, so as to simultaneously suppress the transmission of external vibration excitation to the generator and the transmission of the system's own vibration outward.

[0008] As a further improvement of the present invention, it also includes a frame for fixing the generator; the bottom of the frame is placed on an external mounting surface by a plurality of vibration isolators; the second set of vibration sensor arrays includes foot vibration sensors arranged on the frame corresponding to the positions of each of the vibration isolators; The inner and outer circulation pipes of the generator cooling piping assembly are both connected to the inlet and outlet of the cooler via flanges; the second set of vibration sensor arrays also includes flange vibration sensors arranged on at least one of the flanges. The bearing control mechanism performs weighted averaging on the vibration signals collected by the machine foot vibration sensor and the flange vibration sensor to generate the second feedforward current.

[0009] As a further improvement of the present invention, the external circulation pipe is integrated with a passive mechanical vibration isolation device, which includes at least: A rigid support is fixedly installed on the generator stator or the frame, and the external circulation pipe passes through the rigid support and is anchored thereto to block the transmission of vibration along the pipeline. A spherical compensator is installed on the external circulation pipe between the rigid support and the cooler to compensate for pipeline thermal displacement and isolate vibration.

[0010] As a further improvement of the present invention, the magnetic levitation bearing includes a second axial magnetic bearing, a third radial magnetic bearing and a fourth radial magnetic bearing; the second axial magnetic bearing and the third radial magnetic bearing are both sleeved on the first end of the generator rotor shaft away from the external drive device, and the fourth radial magnetic bearing is sleeved on the second end of the generator rotor shaft close to the external drive device. The bearing housing of the second axial magnetic bearing, the bearing housing of the third radial magnetic bearing, and the generator stator are fixedly installed together in sequence along the axial direction; the bearing housing of the fourth radial magnetic bearing is fixedly installed on the generator stator along the axial direction.

[0011] As a further improvement of the present invention, the bearing seat of the third radial magnetic bearing is also mounted and fixed on the frame to form a three-mating surface mounting structure with two end faces and the bottom face.

[0012] As a further improvement of the present invention, it also includes a flexible coupling for coaxially connecting the output shaft of the external drive device with the generator rotor shaft and transmitting torque to achieve dynamic decoupling; the generator and the external drive device are connected by the flexible coupling and are jointly mounted on the frame. The flexible coupling is a diaphragm coupling, a disc coupling, a magnetic coupling, or a ball cage coupling.

[0013] As a further improvement of the present invention, protective bearings are provided at both ends of the generator rotor shaft; the protective bearings are rolling bearings or sliding bearings; The bearing control mechanism is equipped with a water-cooled plate, which is connected to a cooling circulation pipe to cool the bearing control mechanism.

[0014] As a further improvement of the present invention, the third radial magnetic bearing and / or the fourth radial magnetic bearing includes a stator and a rotor, the stator is mounted and fixed in a corresponding bearing housing, and the rotor is mounted and fixed on the generator rotor shaft; the internal gap of the stator is filled with thermosetting thermally conductive adhesive, and the surface of the rotor is provided with an anti-corrosion coating.

[0015] As a further improvement of the present invention, the generator is an electrically excited synchronous generator, an asynchronous generator, a permanent magnet generator, or a hybrid excited generator; and / or, the external drive device driving the generator rotor shaft is a drive device supported by a magnetic levitation bearing, including a steam turbine, a gas turbine, or an expander.

[0016] As a further improvement of the present invention, the bearing control mechanism is used to receive the vibration signal collected by the vibration sensor array, and generate a feedforward current based on the vibration signal as the input current of the magnetic levitation bearing to suppress vibration.

[0017] As a further improvement of the present invention, the inner and outer surfaces of the frame are covered with a damping layer formed of a high-damping vibration-damping material.

[0018] As a further improvement of the present invention, the first feedforward current and the second feedforward current are generated by independent feedforward control algorithms, wherein the feedforward control algorithm includes at least one of an imbalance compensation algorithm based on vibration signal spectrum analysis, an adaptive filtering algorithm, or a least mean square algorithm.

[0019] Beneficial effects: 1. The power generation system provided by this invention integrates the axial magnetic bearing and radial magnetic bearing at the end of the generator furthest from the external drive device along the axial direction, significantly shortening the overall axial length and increasing power density. The generator is fixedly mounted on the frame, effectively improving the overall support stiffness and modal frequency, which helps reduce system vibration. Simultaneously, the output shaft of the external drive device and the generator rotor shaft are connected by a diaphragm or disc-type flexible coupling, and the flange of the flexible coupling is fitted to the rotor shaft in a tapered sleeve manner. This achieves decoupling of the dynamic characteristics of the generator rotor and the drive device rotor, providing convenient assembly and disassembly and improving the reliability of the shaft system.

[0020] 2. The power generation system provided by this invention uses a magnetic levitation bearing to support the generator rotor shaft. The low stiffness and real-time adjustability of the magnetic levitation bearing enable active vibration reduction, allowing the system to operate with low vibration. The bearing seat of the third radial magnetic bearing adopts a three-mating-surface mounting method with two end faces and a bottom face, further improving the generator's support stiffness and modal frequency, which helps reduce system vibration. High-damping vibration-damping material is applied to the inner and outer surfaces of the frame, effectively reducing the transmission of equipment vibration to the machine feet and achieving low-vibration operation of the system.

[0021] 3. The power generation system provided by this invention installs vibration sensors at three locations: the frame feet, the bearing housing of the radial magnetic bearing, and the flange of the cooler. This constructs a three-dimensional vibration monitoring network consisting of a frame foot vibration sensor array, a bearing housing vibration sensor array, and a flange vibration sensor array. This network is divided into two control paths: First, the vibration signals from the frame feet and flange are used as feedback, and a feedforward current is generated through weighted summation and feedforward calculation to effectively suppress the transmission of the equipment's own vibration. Second, the vibration signals from the bearing housing are used as feedback, and a feedforward current is generated through feedforward calculation to suppress the transmission of external vibration to the system, thereby improving operational stability. The superposition of the two feedforward currents serves as the input current for the magnetic levitation bearing, achieving synchronous active control of both external excitation suppression and the suppression of the transmission of the equipment's own vibration.

[0022] 4. The power generation system provided by this invention features a rigid support installed on the side or frame of the generator. An external circulation pipe connected to the cooler passes through this rigid support and connects to the external cooling system. Utilizing the high rigidity and low vibration of this component, the system effectively suppresses the transmission of vibrations to the external environment. A spherical compensator is installed on the external circulation pipe between the rigid support and the cooler to compensate for thermal displacement caused by temperature changes in the pipe and to isolate the transmission of cooler vibrations to the generator stator. In other words, this invention effectively suppresses the outward radiation of vibrations from the cooling pipe as a vibration transmission path through the rigid support; the spherical compensator both compensates for thermal displacement and isolates the cooler's own vibrations. The synergistic effect of these two components significantly improves the operational reliability and low-vibration characteristics of the cooling pipe system.

[0023] 5. The power generation system provided by this invention has protective bearings at both ends of the generator rotor shaft. In the event of a magnetic levitation bearing failure or power outage, the protective bearings can take over supporting the rotor shaft, thereby improving the safety and reliability of the entire system. The stator portion of the generator's radial magnetic bearing uses thermosetting thermally conductive adhesive to fill the gaps, and the rotor component surface is sprayed with an anti-corrosion coating to solve corrosion and insulation problems caused by high humidity or corrosive environments, further improving the long-term reliability of the system.

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0025] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0026] Figure 1 A front view structural schematic diagram of the high-speed, low-vibration magnetic levitation power generation system provided by the present invention; Figure 2 A cross-sectional structural schematic diagram of the high-speed, low-vibration magnetic levitation power generation system provided by the present invention. Figure 3 This is a schematic diagram of the frame and vibration isolator structure provided by the present invention; Figure 4 This is a schematic diagram of the generator cooling pipe assembly provided by the present invention; Figure 5 A diagram illustrating the architecture of the bearing control mechanism provided by this invention for achieving system vibration reduction; Figure 6 This is a comparison chart of vibration test results between the present invention and a traditional oil-lubricated bearing system.

[0027] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 10. Frame; 11. Vibration isolator; 20. Steam turbine; 21. Steam turbine cylinder; 22. Steam turbine rotor shaft; 221. Steam turbine blade; 23. First axial magnetic bearing; 24. First radial magnetic bearing; 25. Second radial magnetic bearing; 26. First protective bearing; 27. Second protective bearing; 28. Cooling circulation pipe; 30. Generator; 31. Generator stator; 311. Generator stator body; 32. Generator rotor shaft; 321. Generator rotor; 33. Second axial magnetic bearing; 34. Third radial magnetic bearing; 35. Fourth radial magnetic bearing; 36. Third protective bearing; 37. Fourth protective bearing; 40. Flexible coupling; 50. Bearing control mechanism; 60. Cooler; 61. Inner circulation pipe; 62. Outer circulation pipe; 63. Rigid support; 64. Spherical compensator. Detailed Implementation

[0028] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0030] In the description of the embodiments of this invention, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this invention, "multiple" means two or more, unless otherwise explicitly defined.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments of this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0033] In the description of the embodiments of the present invention, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0034] In the description of the embodiments of the present invention, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 the embodiments of the present invention and simplifying the description, and are not intended to 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 the embodiments of the present invention.

[0035] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0036] To address the limitations of existing magnetic levitation bearing integration and vibration control, as well as defects in cooling and pipeline vibration-thermal coupling, this invention provides a high-speed, low-vibration magnetic levitation power generation system, such as... Figures 1 to 3 As shown, it includes a frame 10, a generator 30 fixedly mounted on the frame 10, a flexible coupling 40, a bearing control mechanism 50, and a generator cooling pipe assembly.

[0037] This invention introduces a synergistic structure of a rigid support 63 and a spherical compensator 64 into the generator cooling pipe assembly. The rigid support 63 anchors the external circulation pipe 62 to the high-rigidity, low-vibration region of the generator stator 31 or frame 10, structurally blocking the cooling pipe from acting as a channel for vibration transmission. The spherical compensator 64 compensates for thermal displacement between the rigid support 63 and the cooler 60, while simultaneously isolating the reverse transmission of vibration from the cooler 60 to the generator stator 31. Furthermore, this invention employs an active multi-source vibration suppression strategy. By deploying vibration sensor arrays at three key points—the engine foot, the magnetic levitation bearing housing, and the cooling pipe flange—it achieves full-dimensional perception of the vibration transmission path. A dual feedforward control strategy is then employed, relying on bearing housing sensors to offset external foundation disturbances and on engine foot and flange sensors to suppress internal unit excitation. The two types of feedforward currents are superimposed on the radial magnetic levitation bearing, achieving bidirectional active vibration isolation between the system body and the external environment. The passive mechanical vibration isolation device, combined with the feedforward current control of the magnetic levitation bearing, forms a synergy between passive structural vibration isolation and electromagnetic active vibration reduction, significantly reducing vibration transmission through the critical cooling pipe path.

[0038] In summary, the system utilizes magnetic levitation bearings to support the generator rotor shaft 32 for active vibration reduction. An elastic coupling 40 connects the output shaft of the external drive device to the generator rotor shaft 32, decoupling the dynamic characteristics of the generator rotor and the external drive device rotor, thus improving the reliability of the shaft system. Simultaneously, an external cooling system is used to cool the generator 30 and its magnetic levitation bearings, ensuring that both the magnetic levitation bearings and the generator 30 operate at stable temperatures. The high-speed magnetic levitation power generation system provided by this invention is suitable for high-speed, high-capacity, and low-vibration applications. It features a simple system structure, high integration, high reliability, high power density, and low operating vibration and noise, and has broad application prospects in fields such as shipbuilding and precision manufacturing.

[0039] The following section will provide a detailed description of the specific structure of each part of the high-speed, low-vibration magnetic levitation power generation system described in this invention, as well as the position and connection relationship between each part.

[0040] Example 1 like Figures 1 to 4As shown, Embodiment 1 of the present invention provides a high-speed, low-vibration magnetic levitation generator system, including a frame 10, a generator 30, a flexible coupling 40, a bearing control mechanism 50, a generator cooling pipe assembly, a vibration sensor array, and an external drive device.

[0041] The generator 30 and the external drive unit are connected by a flexible coupling 40 and are mounted together on the frame 10.

[0042] The frame 10 serves as the installation foundation for the entire system. It is a flat plate structure, and all equipment within the system is centrally mounted and fixed on the frame 10, facilitating system transport and installation. Multiple vibration isolators 11 are provided at the bottom of the frame 10. These isolators can be rubber isolators, spring isolators, etc. The frame 10 is placed at the installation location of the power generation system via the vibration isolators 11, which reduce vibration transmission between the equipment and the magnetic levitation power generation system.

[0043] In this embodiment, eight vibration isolators 11 are provided at the bottom of the frame 10, which are divided into two groups. Four vibration isolators 11 in each group are spaced apart along the length of the frame 10 on one side of the bottom surface of the frame 10.

[0044] In other embodiments, the number of vibration isolators 11 is not less than eight.

[0045] In some specific embodiments, the frame 10 is integrally formed by welding titanium alloy or steel, and high-damping vibration reduction material is applied to the inner and outer surfaces of the frame 10 to effectively reduce the transmission of vibration of the power generation system to the machine feet and achieve low vibration operation of the system.

[0046] The generator 30 is mounted and fixed on the frame 10 and is used to convert the mechanical energy transmitted by the external drive device into electrical energy. Furthermore, the generator 30 can be an electrically excited synchronous generator, an asynchronous generator, a permanent magnet generator, or a hybrid excitation generator, and its operating speed is not less than 3000 revolutions per minute.

[0047] like Figure 1 and Figure 2 As shown, in this embodiment 1, the generator 30 includes a generator stator 31 and a generator rotor shaft 32 supported within the generator stator 31 by a magnetic levitation bearing. The generator rotor shaft 32 is connected to the output shaft of an external drive device via a flexible coupling 40.

[0048] The generator rotor shaft 32 is equipped with a generator rotor 321. The generator stator 31 includes a housing and a generator stator body 311 fixedly installed on the inner side of the housing. The generator stator body 311 is radially opposite to the generator rotor 321. An external drive device drives the generator rotor shaft 32 to rotate, and the generator rotor shaft 32 drives the generator rotor 321 to rotate relative to the generator stator body 311, thereby converting the mechanical energy of the generator rotor shaft 32 into electrical energy.

[0049] Furthermore, the flexible coupling 40 connecting the output shaft of the external drive unit and the generator rotor shaft 32 can be a diaphragm coupling, a disc coupling, a magnetic coupling, or a ball cage coupling, etc. The flange of the flexible coupling 40 is connected to the generator rotor shaft 32 using a tapered sleeve. The flexible coupling 40 achieves decoupling of the dynamic characteristics of the generator rotor and the drive unit rotor, and it also facilitates easy assembly and disassembly, improving the reliability of the shaft system.

[0050] Specifically, the magnetic levitation bearing on the generator 30 includes a second axial magnetic bearing 33, a third radial magnetic bearing 34, and a fourth radial magnetic bearing 35; the second axial magnetic bearing 33 and the third radial magnetic bearing 34 are both sleeved on the first end of the generator rotor shaft 32 away from the external drive device, and the fourth radial magnetic bearing 35 is sleeved on the second end of the generator rotor shaft 32 close to the external drive device; the bearing housings of the second axial magnetic bearing 33, the third radial magnetic bearing 34, and the generator stator 31 are sequentially fixed together along the axial direction; the bearing housing of the fourth radial magnetic bearing 35 is fixedly installed on the generator stator 31 along the axial direction.

[0051] The second axial magnetic bearing 33 and the third radial magnetic bearing 34 on the end of the generator 30 away from the external drive device are integrated together along the axial direction. The high degree of structural integration shortens the axial length of the whole machine and improves the power density of the system.

[0052] The second axial magnetic bearing 33 consists of a bearing housing, an inner stator, an outer stator, and a thrust plate. The thrust plate is made of solid high-permeability magnetic steel. The thrust plate is fixed to the end face of the generator rotor shaft 32 away from the external drive device by bolts. The inner stator and outer stator are axially fixed on the inner side of the bearing housing. The thrust plate is located between the inner stator and outer stator, and the gap between the inner stator, outer stator, and the thrust plate is 0.5mm-2mm.

[0053] The third radial magnetic bearing 34 consists of a bearing housing, a stator, and a rotor core. The stator is a purely electrically excited structure with 8, 12, or 16 magnetic poles, which are multiples of 4. The rotor core is formed by stacking 0.1mm-0.5mm low-loss silicon steel sheets. The stator is fixedly mounted on the inner side of the bearing housing, and the rotor core is fixedly mounted on the generator rotor shaft 32 and radially opposite to the stator. The width of the air gap between the stator and the rotor core is 0.4mm-2mm.

[0054] The bearing housing of the third radial magnetic bearing 34 is fixedly mounted on the end face of the generator stator 31 away from the external drive device by screws. The bearing housing of the second axial magnetic bearing 33 is fixedly mounted on the end face of the inner bearing housing of the third radial magnetic bearing 34 by screws. That is, the two magnetic levitation bearings set at the end of the generator rotor shaft 32 away from the external drive device are integrated and installed together and fixed in sequence along the axial direction on the open end face of the generator stator 31, thereby increasing the integration of the internal components of the system and improving the power density of the system.

[0055] Furthermore, the bearing seat of the third radial magnetic bearing 34 is also mounted and fixed on the frame 10 to form a three-mating surface mounting structure with two end faces and the bottom face, thereby further improving the support stiffness and modal frequency of the generator 30 and helping to reduce system vibration.

[0056] The fourth radial magnetic bearing 35 consists of a bearing housing, a stator, and a rotor core. The stator is a purely electrically excited structure with 8, 12, or 16 magnetic poles, which are multiples of 4. The rotor core is formed by stacking 0.1mm-0.5mm low-loss silicon steel sheets. The bearing housing is fixedly mounted on the end face of the generator stator 31 near the drive unit by screws. The stator is fixedly mounted on the inner side of the bearing housing. The rotor core is fixedly mounted on the generator rotor shaft 32 and is radially opposite to the stator. The width of the air gap between the stator and the rotor core is 0.4mm-2mm.

[0057] Furthermore, the stator gaps of the third radial magnetic bearing 34 and the fourth radial magnetic bearing 35 are filled with thermosetting thermally conductive adhesive, and the rotor surfaces of the third radial magnetic bearing 34 and the fourth radial magnetic bearing 35 are provided with anti-corrosion coatings; the filling of the cured adhesive and the coating of the anti-corrosion coatings solve the corrosion and insulation problems caused by high humidity or corrosive environments, thereby improving the reliability of the system.

[0058] like Figure 2 As shown, the two ends of the generator rotor shaft 32 are respectively fitted with a third protective bearing 36 and a fourth protective bearing 37. The two protective bearings are rolling bearings or sliding bearings. The protective bearings are traditional mechanical bearings, which can take over the support of the generator rotor shaft 32 after the magnetic levitation bearing fails or is powered off, thereby improving the safety and reliability of the entire system.

[0059] Specifically, a third protective bearing 36 is fitted onto the end of the generator rotor shaft 32 furthest from the external drive device. The third protective bearing 36 is located between the second axial magnetic bearing 33 and the third radial magnetic bearing 34, fully utilizing the gap between the two magnetic bearings to improve system integration. The third protective bearing 36 is installed radially inside the stator of the second axial magnetic bearing 33 or installed between the second axial magnetic bearing 33 and the third radial magnetic bearing 34 via a separate end cap. The end cap is fixed between the bearing seat of the third radial magnetic bearing 34 and the bearing seat of the second axial magnetic bearing 33. The radial clearance between the third protective bearing 36 and the generator rotor shaft 32 is 0.1mm-0.5mm, and the axial clearance is also 0.1mm-0.5mm. By setting these radial and axial clearances, the third protective bearing 36 does not provide support under normal conditions, thus not affecting the supporting function of the magnetic bearings.

[0060] Meanwhile, a fourth protective bearing 37 is also fitted onto the end of the generator rotor shaft 32 near the external drive device. The fourth protective bearing 37 is mounted on the axial outer side of the fourth radial magnetic bearing 35 via an end cap, which is fixed to the end face of the inner bearing seat of the fourth radial magnetic bearing 35. The radial clearance between the fourth protective bearing 37 and the generator rotor shaft 32 is 0.1mm-0.5mm, and the axial clearance is greater than 2mm. By setting the radial and axial clearances, the fourth protective bearing 37 does not provide support under normal conditions, thus not affecting the supporting function of the magnetic levitation bearing.

[0061] Furthermore, both the third protective bearing 36 and the fourth protective bearing 37 are ceramic ball bearings or oilless sliding bearings.

[0062] Please see Figure 4 As shown, the generator cooling piping assembly includes a cooler 60 mounted on the generator stator 31; the cooler 60 is connected to the cooling water channels inside the generator stator 31 via an inner circulation pipe 61, and is connected to an external cooling system via an outer circulation pipe 62. In this embodiment, the cooler 60 is an air-water cooler.

[0063] Furthermore, such as Figure 4 As shown, a rigid support 63 is installed and fixed on the generator stator 31 or frame 10, and an external circulation pipe 62 passes through the rigid support 63 and connects to the external cooling system; a spherical compensator 64 is provided on the external circulation pipe 62 between the rigid support 63 and the cooler 60. In this embodiment, the rigid support 63 is installed and fixed on the generator stator 31, and the rigid support 63 adopts a semi-circular pipe clamp.

[0064] The external circulation pipe 62 connected to the cooler 60 passes through the rigid support 63 and connects to the external cooling system. The high stiffness and low vibration of the rigid support 63 effectively suppresses the transmission of vibrations to the external system. The spherical compensator 64 compensates for thermal displacement caused by temperature changes in the pipeline and isolates the transmission of vibrations from the cooler 60 to the generator stator 31. Through the synergistic effect of the rigid support 63 and the spherical compensator 64, the operational reliability and low vibration characteristics of the cooling pipeline system are significantly improved.

[0065] The power generation system also includes a bearing control mechanism 50, which is fixedly installed on the frame 10. The bearing control mechanism 50 is electrically connected to the magnetic levitation bearing on the generator 30 to regulate the magnetic levitation bearing according to the control signal.

[0066] Specifically, the bearing control mechanism 50 includes a feedforward controller; the input and output terminals of the feedforward controller are electrically connected to the output terminal of the vibration sensor array and the magnetic levitation bearing, respectively, so that the input current of the magnetic levitation bearing is a feedforward current generated based on the vibration signal of the vibration sensor array.

[0067] The bearing control mechanism 50 is equipped with a water-cooled plate, which is connected to the water-cooled plate through a cooling circulation pipe 28 to cool the bearing control mechanism 50. The cooling effect of the water-cooled plate keeps the bearing control mechanism 50 at a suitable operating temperature, thereby improving the control accuracy of the magnetic levitation bearing.

[0068] The external drive device can be any suitable prime mover such as a steam turbine 20, a gas turbine, or an expander. In this embodiment, the external drive device is a steam turbine 20. The bearing control mechanism 50 is electrically connected to the magnetic levitation bearing on the steam turbine 20 to regulate the magnetic levitation bearing according to the control signal. Based on the active vibration reduction achieved by using magnetic levitation bearings to support both the steam turbine rotor shaft 22 and the generator rotor shaft 32, this invention uses an elastic coupling 40 to connect the steam turbine rotor shaft 22 and the generator rotor shaft 32 to improve the reliability of the shaft system. Simultaneously, an external cooling system is used to cool the magnetic levitation bearing on the steam turbine 20 and the generator 30, ensuring that the magnetic levitation bearing and the generator 30 are at a stable operating temperature.

[0069] Specifically, the steam turbine 20 is mounted and fixed on the frame 10. The steam turbine 20 is used to convert the internal energy of water vapor into mechanical energy. The steam turbine 20 can be a radial flow steam turbine, an axial flow steam turbine, or a mixed flow steam turbine, and its operating speed is not less than 3000 revolutions per minute.

[0070] In some specific embodiments, the steam turbine 20 includes a steam turbine cylinder 21 and a steam turbine rotor shaft 22 mounted within the steam turbine cylinder 21 via magnetic levitation bearings. The steam turbine cylinder 21 has a steam inlet and a steam outlet, and the steam turbine rotor shaft 22 has steam turbine blades 221. Both ends of the steam turbine rotor shaft 22 are supported by magnetic levitation bearings. Steam enters the steam turbine cylinder 21 through the steam inlet and drives the steam turbine blades 221 to perform work, causing the steam turbine rotor shaft 22 to rotate and convert the internal energy of the steam into the mechanical energy of the steam turbine rotor shaft 22. The steam after performing work flows out through the steam outlet.

[0071] Furthermore, the magnetic levitation bearing on the turbine 20 includes a first axial magnetic bearing 23, a first radial magnetic bearing 24, and a second radial magnetic bearing 25; the first axial magnetic bearing 23 and the first radial magnetic bearing 24 are both sleeved on the end of the turbine rotor shaft 22 away from the generator 30, and the second radial magnetic bearing 25 is sleeved on the end of the turbine rotor shaft 22 close to the generator 30; the bearing housings of the first axial magnetic bearing 23, the first radial magnetic bearing 24, and the turbine cylinder 21 are sequentially fixed together along the axial direction, and the bearing housing of the first radial magnetic bearing 24 is also fixedly mounted on the frame 10; the bearing housing of the second radial magnetic bearing 25 is fixedly mounted on the turbine cylinder 21 along the axial direction.

[0072] The first axial magnetic bearing 23 and the first radial magnetic bearing 24 on the end of the steam turbine 20 away from the generator 30 are integrated together along the axial direction. The high degree of structural integration shortens the axial length of the whole machine and improves the power density of the unit.

[0073] The first axial magnetic bearing 23 consists of a bearing housing, an inner stator, an outer stator, and a thrust plate. The thrust plate is made of solid high-permeability magnetic steel. The thrust plate is fixed to the right end face of the turbine rotor shaft 22 by bolts. The inner stator and outer stator are axially fixed on the inner side of the bearing housing. The thrust plate is located between the inner stator and outer stator, and the gap between the inner stator, outer stator, and the thrust plate is 0.5mm-2mm.

[0074] The first radial magnetic bearing 24 consists of a bearing housing, a stator, and a rotor core. The stator is a purely electrically excited structure with 8, 12, or 16 magnetic poles, which are multiples of 4. The rotor core is formed by stacking 0.1mm-0.5mm low-loss silicon steel sheets. The stator is fixedly installed on the inner side of the bearing housing, and the rotor core is fixedly installed on the turbine rotor shaft 22 and is radially opposite to the stator. The width of the air gap between the stator and the rotor core is 0.4mm-2mm.

[0075] like Figure 2As shown, the bearing seat of the first radial magnetic bearing 24 is fixedly installed on the right end face of the turbine cylinder 21 by screws, and the bearing seat of the first axial magnetic bearing 23 is fixedly installed on the right end face of the inner bearing seat of the first radial magnetic bearing 24 by screws. That is, the two magnetic levitation bearings set on the right end of the turbine rotor shaft 22 are integrated and installed together and fixed axially along the end face of the right opening of the turbine cylinder 21 in sequence, thereby increasing the integration of the internal components of the unit and improving the power density of the unit.

[0076] The left end face of the inner bearing seat of the first radial magnetic bearing 24 is fixed on the right end face of the turbine cylinder 21, and its right end face is fixedly connected to the left end face of the inner bearing seat of the first axial magnetic bearing 23. On this basis, the bottom surface of the inner bearing seat of the first radial magnetic bearing 24 is installed and fixed on the frame 10. That is, the first radial magnetic bearing 24 adopts a three-mating surface (left and right end faces and bottom surface) installation method, which improves the overall support stiffness and modal frequency, and helps to reduce unit vibration.

[0077] The second radial magnetic bearing 25 consists of a bearing housing, a stator, and a rotor core. The stator is a purely electrically excited structure with 8, 12, or 16 magnetic poles, which are multiples of 4. The rotor core is formed by stacking 0.1mm-0.5mm low-loss silicon steel sheets. The bearing housing is fixedly mounted on the left end face of the turbine cylinder 21 by screws. The stator is fixedly mounted on the inner side of the bearing housing. The rotor core is fixedly mounted on the turbine rotor shaft 22 and is radially opposite to the stator. The width of the air gap between the stator and the rotor core is 0.4mm-2mm.

[0078] Furthermore, the stator inner gap of the first radial magnetic bearing 24 and the second radial magnetic bearing 25 is filled with thermosetting thermally conductive adhesive, and the rotor surfaces of the first radial magnetic bearing 24 and the second radial magnetic bearing 25 are provided with anti-corrosion coatings; the filling with curing adhesive and the coating with anti-corrosion coatings solve the corrosion and insulation problems caused by steam leakage from the steam turbine 20, thereby improving the reliability of the unit.

[0079] like Figure 2 As shown, the turbine rotor shaft 22 is provided with a first protective bearing 26 and a second protective bearing 27 at both ends. The two protective bearings are rolling bearings or sliding bearings. The protective bearings are traditional mechanical bearings, which can take over the support of the turbine rotor shaft 22 after the magnetic levitation bearing fails or is powered off, thereby improving the safety and reliability of the entire unit.

[0080] Specifically, a first protective bearing 26 is fitted onto the right end of the turbine rotor shaft 22. The first protective bearing 26 is located between the first axial magnetic bearing 23 and the first radial magnetic bearing 24, fully utilizing the gap between the two magnetic bearings to improve the unit's integration. The first protective bearing 26 is installed radially inside the stator of the first axial magnetic bearing 23 or installed between the first axial magnetic bearing 23 and the first radial magnetic bearing 24 via a separate end cap. The end cap is fixed between the bearing housing of the first radial magnetic bearing 24 and the bearing housing of the first axial magnetic bearing 23. The radial clearance between the first protective bearing 26 and the turbine rotor shaft 22 is 0.1mm-0.5mm, and the axial clearance is also 0.1mm-0.5mm. By setting these radial and axial clearances, the first protective bearing 26 does not provide support under normal conditions, thus not affecting the supporting function of the magnetic bearings.

[0081] Meanwhile, a second protective bearing 27 is also fitted onto the left end of the turbine rotor shaft 22. The second protective bearing 27 is mounted on the axial outer side of the second radial magnetic bearing 25 via an end cap, which is fixed to the left end face of the inner bearing seat of the second radial magnetic bearing 25. The radial clearance between the second protective bearing 27 and the turbine rotor shaft 22 is 0.1mm-0.5mm, and the axial clearance is greater than 2mm. By setting the radial and axial clearances, the second protective bearing 27 does not provide support under normal conditions, thus not affecting the supporting function of the magnetic levitation bearing.

[0082] Furthermore, both the first protective bearing 26 and the second protective bearing 27 are ceramic ball bearings or oilless sliding bearings.

[0083] The left end of the turbine rotor shaft 22 in the turbine 20 extends from the turbine cylinder 21 to form an extended end, and the right end of the generator rotor shaft 32 extends from the generator stator 31 to form an extended end. The extended ends of the generator rotor shaft 32 and the extended ends of the turbine rotor shaft 22 are connected by a flexible coupling 40. The generator 30 is axially connected to the turbine 20 to convert the mechanical energy transmitted by the turbine 20 into electrical energy.

[0084] In some specific embodiments, the flexible coupling 40 connecting the turbine rotor shaft 22 and the generator rotor shaft 32 (used to coaxially connect the output shaft of the external drive device with the generator rotor shaft 32 and transmit torque) can be a diaphragm coupling, a disc coupling, a magnetic coupling, or a ball cage coupling, etc. Meanwhile, the flange of the flexible coupling 40 is connected to the rotor shafts (turbine rotor shaft 22 and generator rotor shaft 32) using a tapered sleeve method. The flexible coupling 40 achieves decoupling of the dynamic characteristics of the two shafts, and it also facilitates easy assembly and disassembly, improving the reliability of the shaft system.

[0085] The system also includes a bearing cooling pipeline assembly, which includes a cooling circulation pipe 28, with its two ends connected to the magnetic levitation bearing on the turbine 20 and the external cooling system, respectively.

[0086] Specifically, annular water-cooling grooves are provided in the bearing housings of the first radial magnetic bearing 24 and the second radial magnetic bearing 25. These grooves surround the stator within the two radial magnetic bearings, and one end of the cooling circulation pipe 28 is connected to one of these grooves. To address the high-temperature operating environment of the two radial magnetic bearings at both ends of the turbine rotor shaft 22, annular water-cooling grooves are provided in the bearing housings of the corresponding radial magnetic bearings and connected to an external cooling system via the cooling circulation pipe 28. The cooling effect of the cooling water maintains the operating temperature of the two radial magnetic bearings within a preset optimal electromagnetic performance temperature range.

[0087] The vibration sensor array is distributed at at least two different vibration transmission path monitoring nodes in the system to sense vibration signals from different sources and / or different transmission directions, forming at least two sets of vibration sensor arrays, including: The first set of vibration sensor arrays is arranged on the bearing seat of the magnetic levitation bearing; The second set of vibration sensor arrays is arranged on the mechanical connection path between the system and the external mounting surface and at the external pipeline connection points of the generator 30; including the machine foot vibration sensor array and the flange vibration sensor array; The bearing control mechanism 50 is configured as follows: Receive the vibration signal collected by the first group of vibration sensor arrays and generate the first feedforward current; The vibration signal collected by the second set of vibration sensor arrays is received, and a second feedforward current is generated; The first feedforward current and the second feedforward current are superimposed and used as the input current of the magnetic levitation bearing, so as to simultaneously suppress the transmission of external vibration excitation to the generator 30 and the transmission of the system's own vibration outward.

[0088] Furthermore, the frame 10 is equipped with vibration sensors at the positions corresponding to each vibration isolator 11, forming a vibration sensor array; the bearing seats of the four radial magnetic bearings at both ends of the turbine rotor shaft 22 and both ends of the generator rotor shaft 32 are equipped with bearing seat vibration sensors, forming a bearing seat vibration sensor array. The inner circulation pipe 61 and the outer circulation pipe 62 are both connected to the inlet and outlet of the cooler 60 through flanges, and each flange is equipped with a flange vibration sensor, forming a flange vibration sensor array.

[0089] The bearing control mechanism 50 is configured to receive vibration signals monitored by the bearing housing vibration sensor array and generate a first feedforward current to suppress external vibration excitation, and simultaneously receive vibration signals monitored by the machine foot vibration sensor array and the flange vibration sensor array, and generate a second feedforward current to suppress the vibration of the system itself after weighted averaging; the first feedforward current and the second feedforward current serve as the input current of the radial magnetic bearing on the generator 30 to achieve vibration suppression.

[0090] Specifically, the machine foot vibration sensor array is distributed and installed above the positions of the vibration isolators 11 on the frame 10, and its number is no less than the number of vibration isolators 11. The bearing seat vibration sensor array is installed on four radial magnetic bearing seats, with two sensors installed on each bearing seat, arranged at 90° angles, for a total of eight sensors. The flange vibration sensor array is installed at the inlet and outlet flange positions of the cooler 60, typically with more than four sensors. Each vibration sensor array is powered by the bearing control mechanism 50 and its signals are connected to the bearing control mechanism 50. The vibration sensors can be vibration velocity sensors or vibration acceleration sensors.

[0091] Please see Figure 5 As shown, the vibration reduction control software in the bearing control mechanism 50 generates multiple signals by collecting the vibration sensor signals of the bearing housing, and then generates a first feedforward current to suppress external vibration excitation after feedforward current calculation; after weighted averaging the collected machine foot vibration sensor signals and flange vibration sensor signals to generate multiple signals, a second feedforward current to suppress the vibration of the system itself is generated after feedforward current calculation; the two feedforward currents are superimposed and output to the radial magnetic bearing on the generator 30 to achieve vibration suppression.

[0092] To verify the vibration reduction effect of the high-speed, low-vibration magnetic levitation power generation system described in this invention, a high-speed, low-vibration magnetic levitation power generation system with a rated power of 600kW and an operating speed of 6000 rpm was used for testing. A control group under the same operating conditions was also set up, in which the rotor shaft was supported using conventional oil-lubricated bearings. The vibration test results are as follows: Figure 6 As shown, the average vibration acceleration of the machine foot at multiple measuring points on the system foot is used as a comparison quantity; among them, Figure 6 The horizontal axis in the graph represents the number of frequency bands after division. The frequency range from 0Hz to 10kHz is evenly divided into multiple segments. The larger the number of frequency bands, the higher the corresponding frequency. Figure 6 The vertical axis of the vibration level represents the average amplitude within each corresponding frequency band; the higher the vibration level, the greater the corresponding noise intensity. Compared with traditional systems using oil-lubricated bearings, the system in this specific embodiment shows significant improvement in vibration across the entire frequency band, with the total vibration level decreasing by more than 6 dB. This demonstrates that the magnetic levitation power generation system described in this application has a significant improvement in vibration suppression.

[0093] In summary, this invention discloses a high-speed, low-vibration magnetic levitation power generation system, belonging to the field of generator technology. The system includes a frame with vibration isolators, a generator with a rotor shaft supported by magnetic levitation bearings, a flexible coupling, a bearing control mechanism, and a generator cooling pipe assembly. Vibration sensor arrays are deployed on the frame feet, magnetic levitation bearing housings, and cooling pipe flanges to construct a three-dimensional vibration monitoring network. The bearing control mechanism receives vibration signals from the bearing housings to generate a first feedforward current to suppress external vibration excitation. It also receives vibration signals from the frame feet and flanges, weighted and averaged to generate a second feedforward current to suppress the propagation of the system's own vibration. The two feedforward currents are superimposed to regulate the magnetic levitation bearings, achieving bidirectional active vibration isolation. Meanwhile, a flexible coupling is used to decouple the external drive device from the generator rotor dynamics; the cooling pipes are equipped with rigid supports and spherical compensators to balance thermal displacement compensation and vibration transmission blocking; this solves the problems of poor structural integration adaptability, difficulty in synchronously suppressing internal and external vibrations, and the impact of pipe vibration and thermal displacement on reliability in existing high-speed magnetic levitation power generation systems. The whole machine has high integration and power density, significant vibration reduction effect across the entire frequency band, and a significant reduction in total vibration level, making it suitable for high-speed, high-capacity, low-vibration applications such as ships and precision manufacturing.

[0094] It should be noted that the present invention is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments that have the same structure and perform the same effects as the technical concept within the scope of the present invention are included within the scope of the present invention. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of the present invention, are also included within the scope of the present invention.

Claims

1. A high speed low vibration magnetic levitation power generation system, characterized by, include: A generator, comprising a generator stator and a generator rotor shaft supported within the generator stator by magnetic levitation bearings; The generator cooling piping assembly includes a cooler disposed on the generator stator, the cooler being connected to the cooling water channel inside the generator stator through an internal circulation pipe and connected to an external cooling system through an external circulation pipe; A vibration sensor array is distributed at at least two different vibration transmission path monitoring nodes in the system to sense vibration signals from different sources and / or different transmission directions; The bearing control mechanism includes a feedforward controller; the input and output terminals of the feedforward controller are electrically connected to the output terminal of the vibration sensor array and the magnetic levitation bearing, respectively, so that the input current of the magnetic levitation bearing is a feedforward current generated based on the vibration signal of the vibration sensor array. The vibration sensor array includes at least: The first set of vibration sensor arrays is arranged on the bearing housing of the magnetic levitation bearing; The second set of vibration sensor arrays is arranged on the mechanical connection path between the system and the external mounting surface, as well as on the external pipeline connection of the generator; The bearing control mechanism is configured as follows: Receive the vibration signal collected by the first group of vibration sensor arrays and generate the first feedforward current; The vibration signal collected by the second set of vibration sensor arrays is received, and a second feedforward current is generated; The first feedforward current and the second feedforward current are superimposed and used as the input current of the magnetic levitation bearing, so as to simultaneously suppress the transmission of external vibration excitation to the generator and the transmission of the system's own vibration outward.

2. The high-speed low-vibration magnetic levitation power generation system according to claim 1, characterized by, It also includes a frame for fixing the generator; the bottom of the frame is placed on an external mounting surface by a plurality of vibration isolators; the second set of vibration sensor arrays includes foot vibration sensors arranged on the frame corresponding to the positions of each of the vibration isolators; The inner and outer circulation pipes of the generator cooling piping assembly are both connected to the inlet and outlet of the cooler via flanges; the second set of vibration sensor arrays also includes flange vibration sensors arranged on at least one of the flanges. The bearing control mechanism performs weighted averaging on the vibration signals collected by the machine foot vibration sensor and the flange vibration sensor to generate the second feedforward current.

3. The high-speed, low-vibration magnetic levitation power generation system according to claim 2, characterized in that, The external circulation pipe is integrated with a passive mechanical vibration isolation device, which includes at least: A rigid support is fixedly installed on the generator stator or the frame, and the external circulation pipe passes through the rigid support and is anchored thereto to block the transmission of vibration along the pipeline. A spherical compensator is installed on the external circulation pipe between the rigid support and the cooler to compensate for pipeline thermal displacement and isolate vibration.

4. A high-speed, low-vibration magnetic levitation power generation system according to claim 2, characterized in that, The magnetic levitation bearing includes a second axial magnetic bearing, a third radial magnetic bearing, and a fourth radial magnetic bearing; the second axial magnetic bearing and the third radial magnetic bearing are both sleeved on the first end of the generator rotor shaft away from the external drive device, and the fourth radial magnetic bearing is sleeved on the second end of the generator rotor shaft close to the external drive device. The bearing housing of the second axial magnetic bearing, the bearing housing of the third radial magnetic bearing, and the generator stator are fixedly installed together in sequence along the axial direction; the bearing housing of the fourth radial magnetic bearing is fixedly installed on the generator stator along the axial direction.

5. A high-speed, low-vibration magnetic levitation power generation system according to claim 4, characterized in that, The bearing housing of the third radial magnetic bearing is also mounted and fixed on the frame to form a three-mating surface mounting structure with two end faces and the bottom face.

6. A high-speed, low-vibration magnetic levitation power generation system according to claim 2, characterized in that, It also includes a flexible coupling for coaxially connecting the output shaft of the external drive unit to the generator rotor shaft and transmitting torque to achieve dynamic decoupling; the generator and the external drive unit are connected by the flexible coupling and are jointly mounted on the frame. The flexible coupling is a diaphragm coupling, a disc coupling, a magnetic coupling, or a ball cage coupling.

7. A high-speed, low-vibration magnetic levitation power generation system according to claim 1, characterized in that, Both ends of the generator rotor shaft are equipped with protective bearings; the protective bearings are rolling bearings or sliding bearings. The bearing control mechanism is equipped with a water-cooled plate, which is connected to a cooling circulation pipe to cool the bearing control mechanism.

8. A high-speed, low-vibration magnetic levitation power generation system according to claim 6, characterized in that, The generator is an electrically excited synchronous generator, an asynchronous generator, a permanent magnet generator, or a hybrid excitation generator; and / or, the external drive device driving the generator rotor shaft is a drive device supported by a magnetic levitation bearing, including a steam turbine, a gas turbine, or an expander.

9. A high-speed, low-vibration magnetic levitation power generation system according to claim 4, characterized in that, The third radial magnetic bearing and / or the fourth radial magnetic bearing includes a stator and a rotor. The stator is mounted and fixed in a corresponding bearing housing, and the rotor is mounted and fixed on the generator rotor shaft. The internal gap of the stator is filled with thermosetting thermally conductive adhesive, and the surface of the rotor is provided with an anti-corrosion coating. And / or, the inner and outer surfaces of the frame are covered with a damping layer formed of high-damping vibration-damping material.

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