224 results about "Magnetic levitation system" patented technology

A magnetic levitation system for supporting an object against gravity by a supporting force includes a permanent-magnet dipole aligned in a vertical position and coupled to the object, a supporting-field generator and a stabilization system. The supporting-field generator generates a supporting force on the permanent-magnet dipole via a supporting field. The supporting field is a two-dimensional or three-dimensional magnetic quadrupole field so that the supporting force is independent of a position of the dipole. The stabilization system constrains the dipole against movements in at least one horizontal direction, and includes a diamagnetic element coupled to the dipole and arranged below the dipole, and a stabilizing-field generator generating a second two-dimensional or three-dimensional stabilizing field to restore said diamagnetic element to a position where the field strength of the stabilizing field has a local minimum.

A floating body can be as the magnetic levitation system of the bidirectional random autorotation and its control system. It is are composed of the magnetic levitation permanent magnet embedded in the floating body, electromagnet in the trestle cabinet, displacement transducer, magnetic levitation control circuit, rotary permanent magnet embedded in the floating body, magnetic magnet coil in the trestle cabinet, proximity transducer and rotary control circuit respectively. It is featured by the convenient use. On the corresponding magnetic levitation system, it can evolve into the magnetic levitation tellurions, spheres, balls, toys, advertising products, model exhibitions, souvenirs, artwares.

The present invention presents a novel system and method of damping rolling, pitching, or yawing motions, or longitudinal oscillations superposed on their normal forward or backward velocity of a moving levitated system.

The invention discloses a magnetic levitation device comprising a floater and a magnetic levitation base, a power electromagnet is arranged on the magnetic levitation base, a control instruction for controlling the state of the floater is sent to a micro-control unit through a state control module, the power electromagnet is driven to generate attractive force or repulsion force to realize the rising, falling, or rotation of the floater. Compared with the prior art, the magnetic levitation device can freely control the state of the floater, such as rising, falling, or rotation, based on the user's control instruction, and the user experience is good.

A magnetic levitation system for supporting an object against gravity by a supporting force includes a permanent-magnet dipole aligned in a vertical position and coupled to the object, a supporting-field generator and a stabilization system. The supporting-field generator generates a supporting force on the permanent-magnet dipole via a supporting field. The supporting field is a two-dimensional or three-dimensional magnetic quadrupole field so that the supporting force is independent of a position of the dipole. The stabilization system constrains the dipole against movements in at least one horizontal direction, and includes a diamagnetic element coupled to the dipole and arranged below the dipole, and a stabilizing-field generator generating a second two-dimensional or three-dimensional stabilizing field to restore said diamagnetic element to a position where the field strength of the stabilizing field has a local minimum.

The invention discloses an F sectional steel connecting structure for a medium-low-speed magnetic levitation system. The F sectional steel connecting structure comprises a wing plate lower connecting plate, a clamp plate, an outer leg side connecting plate and two sections of F sectional steel, wherein each section of F sectional steel is provided with an inner leg, an outer leg, a web plate and a wing plate, the two ends of the wing plate lower connecting plate are respectively connected with the wing plates arranged at the two sides through first screw bolts and the clamp plate, a groove longitudinally extending along the line is formed in the side wall of each outer leg, the outer leg side connecting plate is provided with a long slot groove at one side near the clamp plate, and is provided with a round hole at one side leaving far away from the clamp plate, and the outer side connecting plate is fixedly arranged in the groove through second screw bolts. The F sectional steel connecting structure for the medium-low-speed magnetic levitation system has the advantages that the structure is simple, the processing cost is low, the installation is convenient, and the maintenance is easy.

A magnetic lifting device is described. The magnetic lifting device can be configured to generate magnetic lift using a moving magnetic field to generate an eddy current effect in conductive substrate beneath the device. In one embodiment, the moving magnetic field can be generated by a rotor with arrangement of permanent magnets which is driven by a motor. In operation, the rotor can be spun up from rest to above a threshold velocity, which causes the magnetic lifting device to rise up from the conductive substrate, hover in place in free flight and move from location to location. In free flight, the magnetic lifting device can be configured to carry a payload, such as a person.

The invention provides a radial magnetic bearing electrical vortex sensor integrated structure for a magnetic levitation high-speed electric machine, consisting of four radial displacement sensor probes for detecting radial displacement signals, a permanent magnet biased hybrid magnetic bearing controlling the levitation of a rotor and an external sensor signal processing circuit, wherein the sensor probes are integrated in the permanent magnet biased hybrid magnetic bearing, and sensor probe preamplifier circuits are integrated together to be put in a control box of a magnetic levitation electric machine to be separated from the sensor probes. According to the radial magnetic bearing electrical vortex sensor, the space of the magnetic levitation electric machine can be greatly saved, the work efficiency of the magnetic levitation electric machine can be improved, the influence of the temperature drift to the sensor can be reduced, the stability of the magnetic levitation electric machine can be improved, the applicable place of the magnetic levitation electric machine can be enlarged, and the whole performance of the magnetic levitation electric machine can be prominently improved.

A flywheel energy storage device includes the Halbach Motor / Generator with rolling biphasic coil control, continuously variable torque transfer via magnetic induction and a reluctance magnetic levitation system known as the Axial-Loading Magnetic Reluctance Device. Electric energy input turns the magnetically coupled rotors of the Halbach motor, and torque is transferred to a flywheel through a copper cylinder variably inserted between the Halbach magnet rotors. In idle mode, the energy is stored kinetically in the spinning flywheel, which is levitated by a permanent magnet bearing. Electric energy output is achieved by transferring torque from the flywheel through the copper cylinder to the rotors of the Halbach Generator by magnetic induction. Rolling biphasic motor control includes dividing Halbach motor coils into increments, then energizing groups of contiguous increments into virtual coils, which revolve in tandem with the magnet rotors so to achieve continuous and optimal torque.

The present invention discloses an F rail seam structure, which is designed by adopting the normal conducting electromagnetic levitation technology and provided by a low-speed magnetic levitation system for the levitation and guiding of vehicles. The F rail seam structure has the following characteristics: the end of a F rail is milled into an embedding surface, so that a convex splicing part is formed; the end of the convex splicing part is shaped like a circular arc (or planar); circular arc-shaped (or planar) end surfaces are formed on the convex splicing part and a step formed on the upper and the lower ends of the body of the F rail; and a concave part and a circular arc-shaped (or planar) end surface which match the circular arc-shaped (or planar) end surfaces on the convex splicing part and the step are formed on the end surface of the other end of the F rail. While still ensuring rail seam expansion adjustment, vertical and lateral positioning and the rail expansion adjustment of a turnout, the F rail seam structure is simplified and can be easily centered in the process of machining and installation. The F rail seam structure not only can ensure the centering adjustment of rails but also can adjust the temperature-difference expansion of the rails and realize the stretching adjustment of the turning of the turnout. The F rail seam structure is generally used in a passive guiding type low-speed magnetic levitation system.

The invention discloses a loop test track for a vacuum pipeline high-temperature superconducting magnetic levitation train. The loop test track is formed by a magnetic levitation system and a vacuum pipeline (1), wherein the magnetic levitation system is composed of a linear motor (2), a magnetic suspension track (3) and a magnetic levitation train. The magnetic levitation system is nested in the vacuum pipeline (1), so as to form an airtight negative pressure pipeline environment for realizing low resistance operation of the superconducting magnetic levitation train and the vacuum pipeline route. The loop test track disclosed by the invention integrates the superconducting magnetic train and the vacuum pipeline route, displays an advanced track traffic tool, and satisfies the demands of a loop test track for a manned high-temperature superconducting magnetic levitation train, a vacuum pipeline high-temperature superconducting magnetic levitation running test and dynamic characteristic study of high-temperature superconducting magnetic levitation system.

A magnetic levitation flywheel magnetic bearing digital control device which is used in initiative control for the magnetic levitation flywheel magnetic bearing system comprises a interface circuit, a A / D conversion chip, a FPGA module, wherein the interface circuit and the chip get the bit shift single data, the coil current data, the rate signal data of the magnetic bearing rotor; the FPGA module creates a controlling quantity under the hardware assembler of the FPGA chip; wherein the FRGA export to the power amplifier ring basing on the association of the controlling quantity and the current single export and basing on the modulation of PWM, the FPGA module create a control current for the magnetic bearing coil to reach the initiative control of the magnetic levitation flywheel magnetic bearing system. The invention has high reliability, integration, low power consumption.

The invention discloses a sensor-free charging control method of a magnetic levitation energy storage flywheel. The control method comprises the steps of 1, controlling a magnetic levitation system to stably work; 2, measuring three-phase static currents I, I and I<c> of a motor by a Hall current sensor mounted at the input end of the motor; 3, inputting the three-phase static currents I, I and I<c> to a three-phase static to two-phase static conversion CLARKE module; 4, performing open loop and closed loop control switching according to a relationship between a rotating speed estimation value theta<est>and a set threshold theta; 5, obtaining an angle position of a rotor; 6, inputting an angle position simulation value theta<sim> and the estimation value theta<est> to a rotating speed estimation unit so as to obtain a rotating speed estimation value nest of the rotor; 7, inputting I<alpha>, I<beta> and the angle position of the rotor to a two-phase static to two-phase rotating conversion PARK module; 8, performing closed loop feedback control; 9, inputting V<d> and V<q> to a two-phase static to two-phase rotating conversion IPARK module; and 10, performing vector control according to V<alpha> and V<beta> obtained in the step 9. The method is used for sensor-free charging control of the magnetic levitation energy storage flywheel.

The invention discloses a high-temperature superconductive magnetic levitation system introduced with ferromagnetic substances. The system is characterized by comprising rails and a low-temperature container, the rails comprise permanent magnets, magnetic accumulation materials and the like, the low-temperature container is fixed into a vehicle body frame, a high-temperature superconducting bulk layer composed of superconducting bulks is fixed in the low-temperature container, and the ferromagnetic substances are arranged on the superconducting bulks corresponding to a horizontal magnetic field dominant area in the high-temperature superconducting bulk layer. The ferromagnetic substances are introduced above vehicle-mounted high-temperature superconductors, so that stable levitation performance of an original high-temperature superconductive magnetic levitation system can be remarkably enhanced, the high-temperature superconductive magnetic levitation system introduced with the ferromagnetic substances is simple in structure, easy to process, convenient to popularize and the like and can be suitable for places with higher requirements on guide performance of a high-temperature superconductive magnetic levitation vehicle in practical application, such as occasions in curve operation.

The invention discloses a discrete time optimal control method and device for a magnetic levitation system. The discrete time optimal control method comprises the steps of S100, determining a boundarycurve and a control variable linear variation region based on a generalized standard series discrete second-order nonlinear control system, and thus constructing control variable selection rules; S200, building a single-point model of the magnetic levitation system, transforming the single-point model into a standard series second-order nonlinear control system, and constructing a discrete time optimal controller of the magnetic levitation system by combining the control variable selection rules; and S300, acquiring the state of the magnetic levitation system, and enabling the system to achieve an expected system state through the discrete time optimal controller of the magnetic levitation system. The discrete time optimal control method facilitates implementation of a project, and can switch the selection of different control variables according to different positions of the system state, thereby enabling the magnetic levitation system to still realize normal stable levitation when there is internal parameter perturbation, external disturbance and internal disturbance, and having a high robust anti-interference ability.

The invention discloses a linear Halbach permanent magnet-arranged superconductive eddy-current brake device with a superconductive switch, which is used for the non-contact electromagnetic braking of levitated bodies and comprises linear Halbach combination magnets and a superconductive eddy-current brake, and the superconductive eddy-current brake is arranged on a levitated body for braking. The two linear Halbach combination magnets adopted as the sidewalls of a linear Halbach combination magnet track are vertically mounted over the sides of permanent magnet guide rails for levitation along the longitudinal extension direction of a line; and eddy-current coils of the superconductive eddy-current brake adopt superconductive material to form superconductive coils. The linear Halbach permanent magnet-arranged superconductive eddy-current brake device can obtain higher air gap flux than the conventional arrangement method within an available space, and meanwhile, a good magnetic shielding effect can effectively reduce the affection of a magnetic field on a magnetic levitation system. Moreover, the linear Halbach permanent magnet-arranged superconductive eddy-current brake device has the advantages of high eddy-current braking electromagnetic force and controllability.

The magnetic levitation system comprises: a frame tank with an electromagnet to balance dropping gravity of floating body, a floating body under said tank contained permanent magnet on its c.g.line and a rotation magnet, a displacement sensor to measure floating body position, a magnetic levitation control circuit, and a rotation generation device matched with said rotation magnet; arranging said sensor, control circuit and generation device all in said frame tank. The advantages of this invention include: 1. enlarging selection range for floating body; 2. saving base and frame to simplify structure and benefit to large-scale; and 3. increasing application area.

The invention discloses a force-control-based magnetic levitation system and a control method. The system comprises a mechanical device and a control system. The medical device comprises a rotor, an electromagnetic force generation device and dynamometric bearings. The control system comprises a voltage amplifier, a controller and a power amplifier. The dynamometric bearings are arranged at the two ends of the rotor. The electromagnetic force generation device is arranged between the dynamometric bearings at the two ends of the rotor. The input end of the voltage amplifier is connected with the dynamometric bearings, and the output end of the voltage amplifier is connected with the input end of the controller of which the output end is connected with the input end of the power amplifier. The output end of the power amplifier is connected with the electromagnetic force generation device. A displacement control method is replaced by the force control method, the quasi levitation of the rotor is realized, the complexity of a circuit system is lowered, and the system is simple in structure, convenient to construct and suitable for popularization and application, and is flexibly operated.

A flywheel energy storage device includes the Halbach Motor / Generator with rolling biphasic coil control, continuously variable torque transfer via magnetic induction and a reluctance magnetic levitation system known as the Axial-Loading Magnetic Reluctance Device. Electric energy input turns the magnetically coupled rotors of the Halbach motor, and torque is transferred to a flywheel through a copper cylinder variably inserted between the Halbach magnet rotors. In idle mode, the energy is stored kinetically in the spinning flywheel, which is levitated by a permanent magnet bearing. Electric energy output is achieved by transferring torque from the flywheel through the copper cylinder to the rotors of the Halbach Generator by magnetic induction. Rolling biphasic motor control includes dividing Halbach motor coils into increments, then energizing groups of contiguous increments into virtual coils, which revolve in tandem with the magnet rotors so to achieve continuous and optimal torque.

This invention relates to movable magnetic suspension device, which comprises rack part, floater below the rack box with permanent magnetism, wherein the said magnetism is located on the gravity line of the said floater; the said rack box contains electromagnetism to balance floater dropping gravity interacting with the said permanent magnetism and displacement sensor to measure the floater position and magnetism suspension control circuit. The movable device is located with rotation generation device to make the floater rotate cooperating with the rotation magnetism to realize the floater self-rotation.

A method by which a path-constrained vehicle (or series of such vehicles), constrained to travel along a rail or guideway of a magnetic levitation system or to follow a catenary, is equipped to provide electric power derived for off-vehicle use derived from solar collectors formed or provided on the surface of the vehicle. The solar electric power is provided to a coupling system distributed proximate to the rail or guideway or catenary and / or provided as part of same. The coupling system then provides the power for possible use by the public electric power grid or other off-vehicle use, and may compensate the vehicle (or train of vehicles) for the electric power.

The invention relates to the field of a magnetic levitation operation control system with a normal-conduction long stator, and especially relates to an automatic train operation method and system based on a magnetic levitation system. The train automatic operation method based on the magnetic levitation system is provided, and the magnetic levitation system comprises a central control system, a partition control system, a vehicle-mounted control system and a communication network system. The method comprises the following steps: a train awakening step; an automatic route setting step; a step of automatic operation according to the timetable / running chart: commanding of driving and access according to the timetable / running chart sent by the automatic train operation system, and sending of the train operation state and position information to a dispatcher workstation for display; a train operation adjusting step; and a dormancy step of train. Automatic operation of a depot is achieved, the operation plan of the depot is listed into the automatic operation time table, and the functions of automatic dispatching, automatic route entering, automatic operation warehouse-out and the like of trains of the depot are achieved.

The invention discloses a prediction control method and system for a magnetic levitation system. By historical data of the magnetic levitation ball system and through adopting a system identificationmethod, an autoregressive model which takes a Gaussian radial basis function network as a coefficient and has an exogenous variable is established to describe nonlinear dynamic characteristics betweenan input voltage of an electromagnetic winding and a position of a steel ball. An ARX model coefficient is fit by an RBF neural network, so that an RBF-ARX model can well depict the nonlinear dynamiccharacteristics of the magnetic levitation ball system. Then, on the basis of a principle of a predictive functional control algorithm, a structure of a control input is determined so as to completerolling optimization and error correction. The predictive functional control algorithm has higher tracking capacity and higher robustness than PID control, and has a smaller online calculation amountand a higher control speed than conventional model prediction control; and when a system set value is a step signal, the control method can implement unbiased tracking.

The invention discloses an electromagnetic turnout for a magnetic levitation system. The electromagnetic turnout comprises a rail and is characterized in that the rail includes a main rail, a first rail and a second rail; the first rail is connected with the main rail through a second electromagnetic rail, the second rail is connected with the main rail through a first electromagnetic rail, and the second electromagnetic rail and the first electromagnetic rail are identical in structure; the first electromagnetic rail and the second electromagnetic rail are connected with a controller and a power supply. The electromagnetic turnout has the advantages that magnetic levitation train line switching can be completed fast and effectively without moving the rail, and a train is stable and safe in operation during the line switching.

The invention discloses a magnetic levitation transport system which comprises two magnetic levitation modules, two rails, a linear motor and a passive magnetic levitation train, wherein the magneticlevitation modules comprise permanent magnet modules in concave arc structures; concave arc surfaces are arranged on the top surfaces and the bottom surfaces of the concave arc structures; the side surfaces of the concave arc structures are vertical surfaces; the two magnetic levitation modules are arranged at the bottom of the passive magnetic levitation train; the linear motor comprises a linearmotor stator and a linear motor rotor; the linear motor stator is mounted in the center of a pavement of a road bed in a tunnel to be put into service in an advancing direction of the passive magnetic levitation train; and the two rails are uniformly arranged on the two sides of the linear motor stator. The magnetic levitation transport system can solve the problems of complicated structure and poor safety performance due to separation of levitation from guide in the existing passive magnetic levitation system, and has the benefits of simplifying the structure and improving the safety performance.

The invention discloses an adaptive control method for a current loop of a magnetic levitation system. The method comprises the following steps of: 1) judging whether the magnetic levitation system levitates stably after the magnetic levitation system levitates; 2) if the magnetic levitation system levitates stably, collecting the levitation stable current and levitation stable voltage of a coil of the magnetic levitation system, and obtaining a levitation stable resistor R of the coil; 3) superposing high-frequency current to the coil, collecting the current and voltage of the coil multiple times in the current change process of the coil, obtaining multiple inductance values in the current change process of the coil, and averaging the multiple inductance values to obtain a stable-state average inductance value L; and 4) obtaining a feedback gain Kb and a forward gain Kf of the coil, and applying the feedback gain Kb and forward gain Kf to the current loop as current loop control parameters. The method disclosed by the invention has the advantages that: the current rise time in the coil and the gain of the current loop are always kept unchanged, the levitation performance is not influenced by the change of the resistance and inductance of the coil, and the levitation performance is stable and reliable.

The invention discloses a medium-low speed magnetic levitation project work vehicle. The medium-low speed magnetic levitation project work vehicle comprises a compartment (9) and a bogie, wherein the bogie comprises a plurality of single-axle bogie bodies (1); each single-axle bogie body (1) is provided with a guide mechanism; and each guide mechanism comprises a pair of guide wheels (3) in bilateral symmetry and springs (4) used for providing elastic force to support the guide wheels (3) to press the outer side face of an advancing track. The medium-low speed magnetic levitation project work vehicle is provided with the guide mechanisms, under the guide function of the guide mechanisms, it can be ensured that the vehicle drives in the forward direction and the backward direction, especially the stability of turning of the vehicle is ensured, and damage to the track is avoided. In addition, a snow removing and ice melting device (20) and a silencing and noise reducing engine are arranged, serious impact on the living environment of residents is avoided, ice and snow on a magnetic levitation line can be effectively removed under the weather conditions of snowing and raining in winter, and it is ensured that the rainy and snowy weather does not affect safe and normal operation of a medium-low speed magnetic levitation system.

The invention provides a vibration attenuation type magnetic levitation system track expansion adjusting structure, so that the traveling problem caused by temperature difference expansion deformationand end beam deformation of a large-span bridge is effectively solved, and vibration of the magnetic levitation system track expansion adjusting structure is reduced. The structure comprises a trackpanel located on a bridge beam body, at least two lines of longitudinal guide grooves are transversely formed at intervals in the bridge beam body below the track panel, each line of the longitudinalguide grooves is composed of longitudinal guide groove units longitudinally formed at intervals, and two transverse side walls of each longitudinal guide groove unit are provided with longitudinally-extending vertical limiting grooves. Each elastic rolling wheel installed on an installation seat through a telescopic shaft is arranged in the corresponding longitudinal guide groove unit, the two ends of each telescopic shaft extend into the vertical limiting grooves on the same side, and each installation seat is fixedly connected with the track panel.

The invention discloses a digital nonlinear power amplifier which utilizes intelligent closed-loop control. Control signals pass through a digital module and the like and then are output by an output circuit and regulate current values generated by an upper coil and a lower coil of a differential electromagnet. Current feed back values are in two channels, one of the current feed back values is fed back to an output signal converter after real-time detections to perform fast protection for an output driving, and the other one of current feed back values and material parameters are input to a compensating parameter determining module. A position sensor signal feeds back collected signals to the compensating parameter determining module for centralized processing. And then a microprocessor in a system quickly finds compensating parameters in a nonlinear compensation database and overlays the compensating parameters to amplification signals to achieve nonlinear compensation amplification. The nonlinear power amplifier provides technical basis for the practical application of active magnetic levitation and a system controller can be a standard part. The nonlinear power amplifier can play a key role in the achievement of free debugging and mass industrial popularization and application of an active magnetic levitation system.

The invention discloses a method for designing a magnetic levitation system fuzzy controller based on event triggering. The method comprises the following steps of 1, building a dynamic model of a nonlinear magnetic levitation system, unfolding the model at balance points, then converting the model into a state space equation, and conducting T-S fuzzy modeling on the magnetic levitation system according to four fuzzy rules; 2, using an event triggering strategy and the fuzz controller to obtain a corresponding magnetic levitation closed-loop fuzzy system based on event triggering; 3, using aninteractive convex combination method and a Lyapunov function on which fusion parameters depend to deduct a stability condition and design the corresponding fuzzy controller based on event triggering,and using linear matrix inequalities for representation, so that MATLAB solving is facilitated. By means of the method, the nonlinear magnetic levitation system can be effectively controlled, so thatthe system is stable during running; meanwhile, unnecessary information transmission can be reduced, and bandwidth resources are saved.