822 results about "Magnetic bearing" patented technology

The invention relates to the technical field of power supply devices, in particular to an energy-saving optimization method for an electric energy storage device, and the method comprises the steps: fusing a lithium ion battery solid-liquid phase change kinetic equation, a flow battery fluid mechanics equation and a flywheel rotor rigid-flexible coupling equation through a neural differential equation; constructing a dynamic meta-knowledge base containing cross-time scale nonlinear interaction features; performing dynamic parameter compensation on the polarization voltage hysteresis effect and the electrolyte flow resistance coupling effect by using a physical information neural network to generate a decoupled residual feature vector; according to the method, multi-physics field coupling modeling is achieved through the dynamic meta-knowledge base, and the energy efficiency optimization effect of the energy storage device is improved by combining the physical information neural network and the quantum optimization algorithm.

The invention discloses an electromagnetically-supported hybrid magnetic thrust bearing structure and a suspension force design method, and provides a hybrid magnetic bearing structure design in which radial alternate magnetization is adopted in the axial direction, a permanent magnet bearing formed by stacking multiple layers of magnetic rings bears all axial thrust loads, and radial electromagnetic bearings are assisted at the two ends to maintain dynamic stability of a rotor. The performance requirements of high bearing capacity, low power consumption, good active control capability and high dynamic stability of the hybrid magnetic thrust bearing in a limited space are met; in order to solve the problems that an inner magnetic ring and an outer magnetic ring are not strictly centered due to the influence of machining precision, an assembly process, rotor eccentricity and the like during actual operation of a permanent magnet thrust bearing, additional unbalance load, dynamic unbalance load and the like are generated in the radial direction. The electromagnetic supporting suspension force design method comprehensively considers the radial unbalance load of the permanent magnet thrust bearing, the dynamic unbalance load of the rotor and the self-weight influence, effective calculation of the suspension force of the supporting rotor is achieved, and important technical support is provided for the hybrid magnetic thrust bearing structure and suspension force design iteration.

To provide a control device for a magnetic bearing that enables mode separation of a natural vibration mode with high precision and can design a stable controller with the degree of the controller made small.SOLUTION: With respect to a model for a rotary body controlled by radial magnetic bearings 1, 2, a status space model is structured by excluding a controller which controls a plant from a mode composition model having parameters of a mass matrix, a rigidity matrix, and an attenuation matrix identified and adjusted by a parameter estimation part, and a mode separation part 61 on the input side of controllers 1, 2 inputs a measurement signal of a displacement sensor from the radial magnetic bearings 1, 2 to perform mode separation with a mode separation coefficient. A mode composition part 62 on the output side of the controllers 1, 2 performs mode composition with a mode composition coefficient, and outputs a drive command signal (current, voltage) to electric magnets of the radial magnetic bearings 1, 2.SELECTED DRAWING: Figure 14

The invention belongs to the technical field of motors, and relates to a vertical magnetic suspension motor. On the basis of the magnetic bearing control module, the cooling control module and the control evaluation module, closed-loop control of the rotor stably suspending at the target position is achieved, oscillation and steady-state errors are reduced, and the control precision is effectively improved; by dynamically calculating the temperature gradient difference and the cooling power regulation and control value and combining the PID controller and the liquid cooling / air cooling cooperation strategy, on-demand cooling is achieved, the cooling energy consumption is reduced, the temperature balance is improved, and the problems of local overheating or too high energy consumption are avoided; by performing normalized weighted analysis on key parameters such as magnetic bearing energy efficiency and cooling efficiency, feeding back control evaluation coefficients in real time and guiding system parameter optimization, the stability and reliability of long-term operation of the motor are ensured, the failure rate of the motor is reduced, the functional integrity is ensured, and system-level optimization is facilitated.

The invention provides an active-disturbance-rejection control method for an electromagnetic bearing two-level digital switching power amplifier embedded with model information. The method comprises the steps that an electromagnetic bearing two-level digital switching power amplifier mathematical model suitable for controller design is established based on the Fourier series theory and coil current characteristics; a direct current component in the mathematical model is defined as a modeling disturbance term, and feedforward compensation is directly carried out in the control law; parameter perturbation and an unmodeled part in the mathematical model are defined as unknown perturbation items, and real-time estimation is carried out through an extended state observer; a current item and a control input item in the mathematical model are used as known model information to be embedded into the design of the extended state observer; designing a feedback control law to carry out real-time compensation on the current item, the modeling disturbance item and the unknown disturbance item; a zero-order retainer and a current observer are adopted to carry out discretization processing on the controller, and the discretization processing is realized on a digital control platform based on a DSP (Digital Signal Processor). The method is high in current response speed and high in control precision.

The utility model discloses a five-degree-of-freedom permanent magnet biased magnetic suspension bearing, which comprises an outer stator group and an inner rotor group, the outer stator group comprises a stator iron core and two stator magnetic rings respectively arranged at two end parts of the stator iron core, a plurality of stator teeth are arranged on the inner wall of the stator iron core along the radial direction, and coils are wound on the stator teeth; the inner rotor set comprises a rotor core and two rotor permanent magnets arranged at the two ends of the rotor core respectively. The rotor core and the stator teeth are arranged oppositely in the radial direction and are in clearance fit. The two stator magnetic rings and the two rotor permanent magnets are magnetized in the axial direction, the magnetizing directions of the two stator magnetic rings are opposite, and meanwhile the magnetizing direction of any stator magnetic ring is opposite to the magnetizing direction of the rotor permanent magnet opposite to the stator magnetic ring in the radial direction. According to the utility model, a static bias magnetic field is provided by the permanent magnet acting force between the stator magnetic ring and the rotor permanent magnet, dynamic suspension auxiliary adjustment is carried out by using electromagnetism, the power consumption of the system is obviously reduced, the size is small, and the weight is light.

The invention relates to the technical field of magnetic suspension bearings, and provides a magnetic leakage prevention bearing structure which comprises a flux sleeve, a shell, a magnetic part, an inner-layer magnet yoke and an outer-layer magnet yoke. The shell is sleeved outside the flux sleeve, and an inner ring of the shell is provided with a mounting space; the magnetic part is arranged in the mounting space; the inner-layer magnet yoke is arranged in the mounting space and connected with the shell, the inner-layer magnet yoke is concaved inwards to form a first containing groove, and the magnetic part is contained in the first containing groove; the outer-layer magnet yoke is arranged in the installation space and connected with the shell, the outer-layer magnet yoke is concaved inwards to form a second containing groove, and the inner-layer magnet yoke is contained in the second containing groove. A closed magnetic circuit is formed through a double-layer magnet yoke nested structure, the axial magnetic shielding layer design is matched, magnetic flux leakage is effectively restrained, the magnetic field energy utilization rate is increased, electromagnetic interference to external equipment is reduced, and meanwhile the bearing performance and operation stability of the bearing are remarkably improved by optimizing magnet yoke thickness distribution and the permanent magnet arrangement mode.

The invention relates to an integrated protection magnetic suspension motor and a magnetic suspension vacuum pump, and belongs to the technical field of magnetic suspension motor protection. In the magnetic suspension motor, a front backboard is arranged at the front end of a casing, a tail end cover and a tail end cover are arranged at the rear end of the casing, the casing, the front backboard, the tail end cover and the tail end cover form an installation cavity, and a front protection bearing seat, a front radial magnetic bearing seat, a rear protection bearing seat and a rear radial magnetic bearing seat are installed in the installation cavity. And a seam and a connecting surface between the bearing seats are prevented from being exposed outside. Only one air inlet and one air outlet are formed in the machine shell, leakage points are reduced through the design of the single air inlet and the single air outlet, and protection above IP54 is achieved. Meanwhile, heat dissipation and protection of the motor are considered at the same time through the design.

In a magnetic circuit device for a magnetic bearing that includes a permanent magnet ring constituted by a plurality of permanent magnets and a soft magnetic material ring, the circumferential uniformity of the magnetic field near an axial end surface of the permanent magnet ring is enhanced. A magnetic circuit device for a magnetic bearing includes: a permanent magnet ring that is formed by disposing a plurality of anisotropic permanent magnets in a circumferential direction; a first soft magnetic material ring that contacts an outer circumferential surface of the permanent magnet ring; and a second soft magnetic material ring that contacts an inner circumferential surface of the permanent magnet ring. Each of the plurality of anisotropic permanent magnets is magnetized parallel to a straight line that passes through a center of the anisotropic permanent magnet and that extends in a radial direction. The entirety of the outer circumferential surface of the permanent magnet ring has homopolarity, and the entirety of the inner circumferential surface of the permanent magnet ring has homopolarity and has a reverse polarity of the outer circumferential surface of the permanent magnet ring. Grooves in an axial direction are formed on at least one of the first soft magnetic material ring and the second soft magnetic material ring.

The invention discloses a rotor system with a resonance point self-test function, a measurement method, equipment and a medium. The system comprises a controller, an active electromagnetic bearing, a radial vibration displacement sensor and a spectrum analyzer, the controller is used for generating a control signal according to the user configuration parameters and sending the control signal to the active electromagnetic bearing; the active electromagnetic bearing is used for outputting electromagnetic excitation force to the rotor system according to the control signal, so that the rotor system generates radial vibration displacement under the action of the electromagnetic excitation force; the radial vibration displacement sensor is used for collecting a radial vibration displacement signal of the rotor system and sending the radial vibration displacement signal to the spectrum analyzer; and the spectrum analyzer is used for generating a spectrum signal according to the radial vibration displacement signal and determining a rotor resonance point according to the spectrum signal. According to the technical scheme, self-testing of the resonance point of the rotor system can be realized without a speed increasing and decreasing test and an additional excitation device, the safety of the rotor is guaranteed, and uncontrollable accidents are avoided.

An integrated hermetically sealed turboexpander-generator comprises a hermetically sealed casing arrangement, a turboexpander, a compressor and an electric generator, arranged in the hermetically sealed casing arrangement along a common shaft line, supported by active magnetic bearings. Also disclosed is a thermodynamic system using the integrated hermetically sealed turboexpander-generator to convert waste heat from a waste heat source into electric power. The electric generator is arranged at one end of the common shaft line.

The invention discloses a modular five-degree-of-freedom magnetic suspension compressor rotor system and a control method, and belongs to the field of compressor rotors, the modular five-degree-of-freedom magnetic suspension compressor rotor system comprises a magnetic suspension rotor main shaft and a driving motor arranged in the middle of the magnetic suspension rotor main shaft, and a centrifugal impeller and a cooling impeller are installed at the two ends of the magnetic suspension rotor main shaft correspondingly; the magnetic suspension rotor main shaft between the driving motor and the centrifugal impeller and the magnetic suspension rotor main shaft between the driving motor and the cooling impeller are respectively and sequentially provided with an axial magnetic bearing assembly and a radial magnetic bearing assembly; the axial magnetic bearing assembly is of a non-thrust disc structure in which a magnetic field is directly coupled; the radial magnetic bearing assembly is of a modular structure with partitioned magnetic poles. According to the modularized five-degree-of-freedom magnetic suspension compressor rotor system and the control method, the axial magnetic bearing assembly directly coupled with the magnetic field is adopted, a thrust disc is omitted, the assembly process of the axial magnetic bearing is simplified, meanwhile, the partitioned magnetic poles are adopted, redundancy control is achieved, and stability is higher.

The present invention relates to a five-degree-of-freedom ultra-high-speed bearingless permanent magnet motor. Both ends of a cylindrical solid permanent magnet are respectively connected to a rotating shaft. A casing is installed outside the cylindrical solid permanent magnet. A stator core is fixedly installed on the casing. A set of torque windings is embedded in the bottom layer of the stator core, and two sets of suspension windings are embedded in the upper layer of the stator core. End covers are fixedly installed on both sides of the casing. Auxiliary bearings are installed between the end covers and the rotating shaft. Passive permanent magnet bearings are nested on both the end covers and the rotating shaft. The present invention is reasonably designed, integrating a magnetic suspension bearing and a permanent magnet motor into one. While the motor generates an electromagnetic torque capable of driving the rotor to rotate, it can also generate a radial suspension force to overcome the rotor gravity and unilateral magnetic pull force, simplifying the motor structure and shortening the axial length of the motor. The double suspension windings and the axial passive permanent magnet magnetic bearing achieve five-degree-of-freedom control, increasing the rotor stiffness and critical speed of the ultra-high-speed motor, and improving the operation stability and anti-disturbance ability.

An axial active magnetic bearing includes a rotating shaft, a magnetic yoke, a permanent magnet, a magnetic barrier structure and an electromagnetic coil. The rotating shaft includes a main shaft and a thrust plate; first and second air gaps with a projected area size having an error smaller than 5% are formed between the magnetic yoke and the thrust plate; the permanent magnet is provided on the magnetic yoke, and a third air gap is formed between the thrust plate and the permanent magnet; a permanent magnet magnetic flux is formed between the permanent magnet and the magnetic yoke; the magnetic barrier structure is provided on the magnetic yoke and positioned in the path of the permanent magnet magnetic flux, the permanent magnet magnetic flux is passed through the barrier structure, the first air gap and the third air gap; the electromagnetic coil is provided in a magnetic yoke chamber.

The invention provides a method and equipment for calculating hysteresis loss of an axial electromagnetic bearing, and belongs to the technical field of hysteresis loss calculation. The method comprises the following steps: establishing an equivalent magnetic circuit model; under the condition of axial vibration of the thrust disc, magnetomotive force is calculated, and total dynamic magnetic flux is determined through an equivalent magnetic circuit model; establishing a quantitative relationship between any two of the maximum magnetic flux density amplitude, the magnetic hysteresis loss and the angle parameter representing the magnetic hysteresis effect; taking magnetomotive force as magnetic field excitation, taking total dynamic magnetic flux as magnetic field response, and constructing complex permeability based on a quantitative relation; updating the equivalent magnetic circuit model by using the complex permeability; solving the maximum magnetic flux density amplitude of each region of the iron core under the dynamic working condition through iterative calculation; calculating the hysteresis loss of each region based on the quantitative relation and the maximum magnetic flux density amplitude of each region; and the total magnetic hysteresis loss is calculated. Based on the method, the invention further provides calculation equipment for the hysteresis loss of the axial electromagnetic bearing. According to the method, the hysteresis loss of the axial electromagnetic bearing under the dynamic operation condition can be accurately calculated.

The invention discloses a radial two-degree-of-freedom hybrid magnetic bearing with external permanent magnets. The radial two-degree-of-freedom hybrid magnetic bearing comprises a stator and a rotor. The rotor comprises a rotor iron core, a rotating shaft, two rotor U-shaped grooves, two rotor magnetic isolation aluminum rings and two rotor permanent magnet rings, the stator comprises a stator iron core, a coil, two stator U-shaped grooves, two stator magnetic isolation aluminum rings and two stator permanent magnet rings, and the polarities of the stator and the rotor permanent magnet rings which are opposite up and down are opposite; the permanent magnet rings are respectively embedded into the corresponding U-shaped grooves and are arranged on two sides of the stator core and the rotor core through the magnetic isolation aluminum rings, eight magnetic poles are uniformly distributed in the stator core, eight coils are wound on the magnetic poles, the coils on two poles in the + X,-X, + Y and-Y directions are respectively and reversely connected in series to form suspension windings in the + X,-X, + Y and-Y directions, and then the suspension windings are driven by the four switch power amplifiers. The radial two-degree-of-freedom hybrid magnetic bearing provided by the invention has the advantages of no coupling of permanent magnetic flux and suspension magnetic flux, high suspension precision, low power consumption, easiness in processing and assembling and high suspension force density.

The axial self-balancing three-degree-of-freedom magnetic bearing is characterized in that a stator part comprises a stator yoke, a left attraction iron core, a right attraction iron core, a left repulsive iron core and a right repulsive iron core which are all mounted on an aluminum alloy bracket, and four poles wound with coils are uniformly distributed on the inner circumference of the stator yoke; an axial control winding is embedded in the attraction iron core, and a stator permanent magnet is embedded in the repulsive iron core. The rotor part comprises a rotor core and a rotating shaft, a radial air gap and an axial air gap are respectively arranged between the rotor core and the radial iron core, between the attraction iron core and the repulsive force iron core, rotor permanent magnets are arranged on two sides of the rotor core and at positions corresponding to the stator permanent magnets of the repulsive force iron core, and the polarities of the stator permanent magnets and the rotor permanent magnets facing the axial air gap are the same. The radial magnetic flux magnetic circuit, the axial control magnetic flux magnetic circuit and the permanent magnetic flux magnetic circuit are completely independent and free of coupling, axial static balance of the rotor is achieved, suspension is achieved in the radial direction, control is easy, and the controllable suspension force is large.

The invention discloses an intelligent start-stop control method and system for a magnetic suspension refrigeration compressor, and the method comprises the steps: obtaining a position perception enhancement source through collecting and analyzing the current response data of a magnetic bearing coil, and extracting the current response change characteristics; rotor position estimation is carried out based on current response change characteristics, a positioning precision driving source is extracted from estimation deviation, and a non-impact starting excitation current instruction is generated; a multi-sensor fusion data network is established, configuration is reconstructed through an abnormal response activation signal, and a degradation operation fault-tolerant mode is formed; converting a response preparation gain according to the shutdown instruction signal, performing shutdown state evaluation in combination with signal reconstruction configuration, and generating an emergency shutdown trigger condition; and the power supply state of a bus capacitor is detected, gradient control potential is released, the active damping control opportunity is determined, a damping force control instruction is generated, finally intelligent start-stop control over the magnetic suspension refrigeration compressor is achieved, and safe and reliable operation of the system under various working conditions is ensured.

The invention relates to a magnetic suspension bearing, a compressor and an air compressor, and the magnetic suspension bearing comprises a support assembly which is used for being fixedly connected with a shell of the compressor; the bearing stator assembly is mounted on the support assembly; wherein the support assembly is provided with at least one liquid cooling flow channel, and at least part of the liquid cooling flow channel is arranged opposite to the bearing stator assembly in the axial direction of the magnetic suspension bearing. According to the magnetic suspension bearing disclosed by the invention, the cooling liquid in the liquid cooling flow channel circularly flows, so that the cooling liquid exchanges heat with the support assembly which generates heat, the heat is absorbed, and the temperature of the magnetic suspension bearing is reduced. And the cooling liquid absorbing heat flows out of the flow channel, is cooled by an external heat dissipation device and then flows into the flow channel again to form continuous cooling circulation, so that the temperature of the magnetic suspension bearing is effectively controlled, and the influence of local high temperature on the performance and the service life of the compressor is avoided.

The invention discloses a motor magnetic bearing assembly calibration method and system, electronic equipment and a medium, and the method comprises the steps: building a correlation model between a control current and a motor three-phase current under a rotor rotating coordinate system during the calibration of a magnetic bearing; the rotation angle of the rotor is adjusted by changing the control current, the motor correspondingly adjusts the three-phase current according to the control current, and rotation operation on the rotor is executed; taking the initial position of the rotor in a rotating coordinate system as a 0-degree position, sequentially controlling the rotor to rotate for a circle according to 45-degree intervals, controlling the rotor to suspend to a balance position through a magnetic bearing controller at the 0-degree position and after each rotation, and calibrating the magnetic bearing at each angle, according to the invention, the control strategy of the motor to the rotation of the rotor can be simplified, the position of the rotor can be accurately controlled, manual participation is reduced, the operation time is saved, and the efficiency and accuracy of multi-angle calibration are greatly improved.

The utility model discloses and provides an integrated magnetic shaft shell, a structure capable of conveniently adding lubricating oil is designed on the magnetic shaft switch, and the integrated magnetic shaft switch with the self-lubricating function can be guaranteed to be lubricated after being used for a long time. The magnetic bearing comprises a shaft body, a magnet, an elastic body and a shell, the shaft body is provided with a plurality of first point oil holes and a plurality of oil groove openings, the first point oil holes are correspondingly communicated with the oil groove openings, the shell comprises a cover body and a base which are integrally formed in an injection molding mode, and the shaft body is matched in the shell in a floating mode through the elastic body. The magnet is arranged in a groove in the bottom of the shaft body in a limiting fit mode, the shell is provided with a plurality of lubricating oil channels, and the oil groove openings are arranged on the lubricating oil channels in a sliding fit mode. The magnetic shaft switch is applied to the technical field of magnetic shaft switches.

The invention relates to the technical field of flywheel energy storage, in particular to a stability control method for a magnetic suspension flywheel energy storage system with time delay feedback. Determining axial bearing capacity and radial bearing capacity demand parameters of the flywheel energy storage device based on gravity and impact load of the flywheel rotor and centrifugal force and unbalanced force generated during high-speed rotation; according to the bearing capacity demand parameters, U-shaped stator structure design is carried out on the axial electromagnetic bearing, an inner ring and outer ring magnetic pole equal-area structure is adopted, the axial electromagnetic bearing is made of electrical pure iron, octupole electromagnetic bearing design is carried out on the radial electromagnetic bearing, and a stator and a rotor are made of silicon steel sheets formed through pressing; and carrying out temperature field distribution simulation analysis on the axial electromagnetic bearing and the radial electromagnetic bearing by adopting a bidirectional coupling mode of an electromagnetic field and a temperature field. The method further comprises the steps that an auxiliary bearing protection system is arranged, differential working mode control is adopted, and dynamic adjustment of the bearing capacity of the electromagnetic bearing under different working conditions is achieved by adjusting bias current and control current.

A magnetic levitation motor, which comprises a vacuum housing, a rotating shaft, a motor rotor, a motor stator, a magnetic bearing and a cooling unit. A chamber is formed in the rotating shaft and a liquid spraying hole is formed in the upper portion of the rotating shaft, the rotating shaft being rotationally arranged in the vacuum housing. A liquid medium is stored at the bottom portion of the inside of the vacuum housing. The end of the rotating shaft extending into the liquid medium is connected to a rotating body to draw the liquid medium into the chamber; the liquid medium is sprayed out to the inner wall of the housing through the liquid spraying hole; heat generated by the rotor is conducted to the vacuum housing via the liquid medium; a cooling water channel is provided in a wall body of the vacuum housing; and the cooling unit is communicated with the cooling water channel and is used for cooling the vacuum housing. Compared with the prior art, the magnetic levitation motor of the present invention has the advantages of a simple structure, a reliable heat exchange mode, high heat dissipation efficiency, etc., and can effectively solve the heat dissipation problem of motor rotors in vacuum environments.

The invention discloses a magnetic bearing-rotor system moving base interference suppression method and system. The method comprises the following steps: establishing a magnetic bearing-rotor system rotation equivalent kinetic model; establishing a magnetic bearing-rotor system dynamic model containing base interference; based on the magnetic bearing-rotor system rotation equivalent dynamical model and the magnetic bearing-rotor system dynamical model containing base interference, obtaining a magnetic bearing-rotor system rotation dynamical model containing interference terms; obtaining an extended state observer based on a magnetic bearing-rotor system rotation dynamic model containing interference terms; obtaining an extended state observer based on model reference adaptive compensation through the extended state observer and the model reference adaptive compensator; and interference suppression on the moving base of the magnetic bearing-rotor system is completed through an expansion state observer based on model reference adaptive compensation. The anti-interference performance of the system is improved, and the influence of the interference of the movable base on the system is reduced.

The application provides a magnetic suspension flywheel energy storage system, which comprises a magnetic suspension bearing, a flywheel and a motor arranged in sequence from top to bottom. The magnetic bearing with 5 degrees of freedom is arranged on the upper end of the flywheel rotor. The upper end stator of the magnetic bearing is provided with 4 upper layer stator teeth and 4 lower layer stator teeth. The circumferentially adjacent upper layer stator teeth and lower layer stator teeth are staggered by 45 degrees. The circumferentially adjacent upper layer stator teeth and lower layer stator teeth are staggered by 90 degrees. The upper layer stator teeth and the lower layer stator teeth are equal in size and large in pole shoe part. The lower surface of each upper layer stator tooth or lower layer stator tooth extends downward by an axial stator tooth, and there are totally 8 axial stator teeth. Each stator tooth is provided with a control coil. The axial magnetized annular magnetic bearing permanent magnet is arranged between the upper end stator and the lower end stator. The lower end stator is in the shape of L and is annular, which is used for fixing the magnetic bearing permanent magnet. The application realizes the control of the 5 degrees of freedom of the flywheel rotor, and is simple in structure and easy to process and install.

The invention discloses a magnetic suspension vacuum pump, and relates to the technical field of vacuum pumps. The magnetic suspension vacuum pump comprises a shell, and an impeller, a front bearing seat, a front radial magnetic bearing, a stator, a rear radial magnetic bearing, an axial magnetic bearing and a rotor which are sequentially assembled in the shell, and further comprises a spacer ring, the spacer ring is arranged between the front bearing seat and the front radial magnetic bearing, and a gap communicated with the exterior of the shell is reserved between the spacer ring and the front radial magnetic bearing; a first air inlet cavity is formed; the first flow channel comprises a first air inlet cavity, an air gap between the front radial magnetic bearing and the rotor, an air gap between the stator and the rotor and a first air exhaust cavity. The heat exchange devices are arranged at the two ends of the stator, so that the temperature of the cooling gas can be reduced through the heat exchange devices before the cooling gas passes through the stator, and the problem of local heat accumulation caused by continuous temperature rise in the flowing process of the cooling gas in the shell is avoided.

The utility model discloses an axial force testing device for magnetic suspension bearings, which comprises a first testing frame, a second testing frame, a simulation rotor and a testing component, two magnetic suspension bearings are respectively arranged on the first testing frame and the second testing frame, when the two magnetic suspension bearings are in a working state, two ends of the simulation rotor are in a suspension state, and the testing component is arranged on the simulation rotor. The testing part comprises an operation part and a force measuring part, the operation part pushes the force measuring part to move on the first side of the first horizontal direction and cooperates with the force measuring part to push the simulation rotor in the suspended state to move, so that the simulation rotor moves in the axial direction, and the force measuring part is used for measuring the force when the simulation rotor in the suspended state moves. According to the axial force testing device for the magnetic suspension bearing, the axial force of the simulation rotor in the suspension state along the second side of the first horizontal direction is detected, the testing precision is greatly improved through the cooperation of the operation part and the force measuring piece, meanwhile, the testing efficiency is high, and the fast-paced production requirement is met.

The invention belongs to the technical field of helium fans, and particularly relates to a main helium fan of a high-temperature gas cooled reactor. The main helium fan comprises a shell, a rotating shaft is arranged in the shell, a middle flange is connected in the shell, a labyrinth sealing device is connected between the middle flange and the rotating shaft, and an inner cavity of the shell is divided into a motor cavity and a working cavity by the middle flange; the end, extending out of the working cavity, of the rotating shaft is connected with a main impeller, a machine base is fixed in a motor cavity of the shell, a lower radial electromagnetic bearing and an auxiliary bearing are connected between a lower bearing end cover and the rotating shaft, and an auxiliary bearing, a thrust electromagnetic bearing and an upper radial electromagnetic bearing are connected between an upper bearing end cover and the rotating shaft. A stator is arranged between the rotor and the base, an axial flow fan is installed at the top of the rotating shaft, a helium water cooler is installed at the upper end of the motor upper cover, and the axial flow fan is located on the lower side of the helium water cooler. According to the high-temperature gas cooled reactor primary helium fan, the motor cavity and the working cavity are effectively isolated, and the temperature rise of the motor cavity is reduced.

The invention relates to an electromagnetic bearing rotor system unbalance control method based on a DDPG algorithm, and the method comprises the following steps: building a rotor dynamics equation according to rotor dynamics, and carrying out the decoupling control; constructing a compensation current, extracting an unbalance coefficient in the compensation current, and constructing a self-adaptive identification equation; constructing a DDPG intelligent agent, fusing position errors, system response and control output, and designing a multi-target reward function through a normalized weighted optimization strategy; and a DDPG intelligent agent is used to optimize an unbalance coefficient identification parameter, and a compensation current is dynamically adjusted in combination with the rotating speed of the rotor, so that unbalance force disturbance is counteracted. According to the invention, identification is carried out by combining the deep reinforcement learning algorithm DDPG according to the unbalance coefficient reflected to the two ends of the rotor by the unbalance force borne by the rotor, the identification and unbalance compensation efficiency of the unbalance coefficient is improved, and rapid, stable and efficient compensation of a rotor system is realized.

The invention discloses an energy storage flywheel which comprises a shell, a flywheel rotor and a radial magnetic bearing assembly, a center shaft support is connected between a top plate and a bottom plate of the shell, the flywheel rotor is arranged in the shell and is a cylinder, and the radial magnetic bearing rotor is installed on the inner circumferential face of the flywheel rotor and annularly arranged in the circumferential direction of the flywheel rotor. The multiple hydraulic control pieces are evenly spaced in the circumferential direction of the center shaft support, each hydraulic control piece comprises a hydraulic oil cylinder and a piston rod, the hydraulic oil cylinders are installed on the outer circumferential face of the center shaft support, and the radial magnetic bearing stators are installed at the ends, facing the radial magnetic bearing stators, of the piston rods. According to the energy storage flywheel, the hydraulic control piece can be used for flexibly controlling the radial magnetic bearing stator to move in the radial direction, so that when the flywheel rotor rotates at a high speed and generates large deformation, the air gap of the radial magnetic bearing is kept unchanged by moving the radial magnetic bearing stator; and therefore, the bearing capacity, the control precision, the linearity and the like of the magnetic bearing in a high-speed rotating state are not influenced.