257 results about "Magnetic suspension system" patented technology

A suspension system for magnetically suspending an object O comprises an electromagnetic coil L having an axially extending core 13 of magnetically permeable material and a permanent magnet 14 disposed on its axis. A permanent magnet 10 is also provided in the object O and is arranged such that it is in attraction with the permanent magnet 14 on the coil L, and with the magnetically permeable core 13 so that the object O is suspended at a position below the coil L by the attractive force. Sensors 15,16 on the coil L detect the magnetic field of the permanent magnet 10 in the object O, and provide signals to a control circuit, which applies current to the coil L to attract the object O when the detected field is below a predetermined limit and to repel the object when the detector field is above a predetermined limit. In this manner, the object O is held in position using a relatively low current, since the coil L is only energised when the object moves away from the position in which it is held by the field of the permanent magnets 10,14.

The invention provides a method for inhibiting the track coupled vibration of a suspension system of a magnetic suspension train; the method is as follows: bringing the characteristics of a magnetic track into the magnetic suspension train system to lead to a five-level system of the magnetic suspension train system; acquiring five independent state variables which represent the suspension train and track states; comprehensively controlling the magnetic suspension system according to the five state variables and adjusting the control variables of the system; controlling the suspension clearance of the magnetic suspension train in a certain range; inhibiting the coupled vibration of the track of the suspension system of the magnetic suspension train and realizing the stable suspension of the magnetic suspension train. The invention further provides a suspension control unit formed by a suspension magnet, a suspension sensor, a suspension controller, a differentiator and the like, and the suspension control unit is used as an execution element in the control. The method not only inhibits the coupled vibration of the track of the suspension system of the magnetic suspension train, but also effectively solves the problem of noise amplification in the ordinary differential method.

The invention relates to a suspension control method for a magnetic suspension system, which comprises the steps: adopting a current loop to accelerate the rising velocity of the current i in an electromagnetic coil; adjusting a position loop to control the suspension performance in a set range; eliminating the static error during stable suspension by controlling the integral of a suspension clearance; selecting an integral control parameter ki so as to eliminate the influence of the suspension clearance integral on suspension performance; using a suspension performance index to adjust a suspension clearance control parameter kp and a suspension clearance differential control parameter kd; determining laden variable quantity according to the variation of stable suspension current i; corresponding changes the suspension control parameters kp and kd according to the variation of suspension current i0 so as to adjust the voltage control variable u2 at the both ends of an electromagnet in the suspension process and keeping the suspension performance unchanged all the time under the condition of variable load. By using the current of the magnetic suspension system when the suspension is stable to change the suspension control parameters, the method can not only overcome the disadvantages of the ordinary PID control method, but also has the advantage of easy realization of the ordinary PID control method.

The invention relates to a permanent-magnet offset radial magnetic bearing. It includes radial stator, control coil, circle permanent magnet, exterior magnetic pole iron core and rotator covered by rotator iron core. The permanent-magnet offset radial magnetic bearing has advantage of simple structure, small volume, and light weight. It has a broad application prospect in kinds of magnetic suspension systems that take up small space on radial direction.

The invention discloses a structure for achieving five-freedom-degree suspension of a rotor through axial mixed magnetic bearings. The structure comprises the magnetic suspension rotor, the axial electromagnetic and permanent-magnetic mixed magnetic bearings are arranged at the two ends of the magnetic suspension rotor in the axial direction respectively and used for providing axial suspension force and radial suspension force for the rotor, and the axial electromagnetic and permanent-magnetic mixed magnetic bearings arranged at the two ends of the rotor in the axial direction are distributed symmetrically; axial displacement sensors are arranged at the two ends of the rotor in the axial direction or the radial direction respectively and connected with a controller, and the controller is connected with the axial electromagnetic and permanent-magnetic mixed magnetic bearings arranged at the two ends of the magnetic suspension rotor in the axial direction through power amplifiers. The structure has the advantages that the active control freedom degree of a magnetic suspension system is lowered to the minimum, controllers, power amplifiers, electromagnetic coils and other components needed by surplus active freedom degree control are omitted, a five-freedom-degree magnetic suspension bearing supporting structure is simplified, and the mixed magnetic bearings lower bias current and system power consumption.

Systems are disclosed for holding an object in mid-air under the influence of fixed and variable magnetic forces countering the gravitational pull of the object. These systems can be used for display purposes, such as advertising or commercial displays; and/or educational purposes such as spinning globes. It is perceived that the larger the gap between the suspended object and the structure containing the magnets and control systems, the more desirable the device becomes.

The invention discloses a vehicle double-layer high-temperature superconductor magnetic suspension system, which is characterized by comprising a track and a low-temperature container, wherein the track is made of permanent magnet, a magnetic flux gathering material and the like; the low-temperature container is fixedly arranged in a vehicle body frame; and a high-temperature superconductor layer is fixedly arranged in the low-temperature container and is designed into two layers which are formed by overlapping a lower layer block 103a and an upper layer block 103b. According to the vehicle double-layer high-temperature superconductor magnetic suspension system, by additionally arranging the upper superconductor layer, the aim of simultaneously increasing the suspension force and the guidance force performance of the original single-layer suspension layer can be fulfilled; and the vehicle double-layer high-temperature superconductor magnetic suspension system can be used for optimizing the conventional single-layer high-temperature superconductive magnetic suspension system and improving the load carrying capacity and the stability performance of a superconducting maglev train.

An F rail connector structure of a medium-and-low-speed magnetic suspension system rail aims to improve torsional stiffness and the altitude difference misalignment prevention ability of an F rail connector, and improve mounting precision of the rail. An inner guiding and limiting groove and an outer guiding and limiting groove which longitudinally extend are formed in the inner bottom and the outer side wall of a wing rail at the connecting end of each of two adjacent F rails respectively, the opening end of a U-shaped connecting plate is embedded into the inner guiding and limiting grooves and the outer guiding and limiting grooves, long slotted holes are formed in the U-shaped connecting plate in the longitudinal direction and the horizontal direction at intervals, and bolt connecting components which penetrate through the long slotted holes enable the U-shaped connecting plate and the two adjacent F rails to be detachably connected.

The invention discloses a magnetic field reinforced high-temperature superconducting magnetic suspension system, which comprises a magnetic suspension track, a high-temperature superconducting bulk array, a high-temperature superconducting magnetizing and magnetic field adjusting coil and a low-temperature thermostat, wherein the high-temperature superconducting bulk array is positioned on the magnetic suspension track; the high-temperature superconducting magnetizing and magnetic field adjusting coil is arranged on the upper surface of the high-temperature superconducting bulk array; the low-temperature thermostat is used for accommodating and cooling high-temperature superconducting bulks and the high-temperature superconducting magnetizing and magnetic field adjusting coil; and the high-temperature superconducting magnetizing and magnetic field adjusting coil is made of a BSCCO or YBCO high-temperature superconducting strip. Due to the adoption of the system, the field intensity of a magnetic suspension track magnetic field is increased remarkably, the trapped field of the high-temperature superconducting bulks is increased, the suspension force and guide force of the high-temperature superconducting magnetic suspension system are further enhanced, dynamic adjustment of the suspension force and guide force of the high-temperature superconducting magnetic suspension system can be realized simultaneously, and the performance and complex working condition coping capability of the high-temperature superconducting magnetic suspension system are enhanced.

The invention discloses a device based on a time-varying sliding mode variable structure control and a cross-coupling two electromagnetic suspension systems synchronous control. The device comprises a time-varying sliding mode variable structure controller which outputs a controlled quantity of a suspension system according to a suspension height error amount so as to suspend a mobile crossbeam quickly and accurately to a given height, a cross-coupling synchronous controller which adjusts synchronization performance of two electromagnetic suspension systems, a driver which drives the two electromagnetic suspension systems based on output signals of the time-varying sliding mode variable structure controller and the cross-coupling controller, and a signal detector which collects a speed and a position signal of the electromagnetic suspension systems. The synchronous control method based on the time-varying sliding mode variable structure and the cross-coupling two electromagnetic suspension systems includes that a single electromagnetic suspension system uses a time-varying sliding mode variable structure control method. The control method of the invention, while keeping such characteristics of the sliding mode variable structure as the strong robustness to the parameter perturbation and the external uncertain interference, improves the response speed of the system.

The invention discloses an axial magnetic suspension bearing which comprises a bearing body and a protecting device, wherein the bearing body comprises a stator and a rotor, wherein the protecting device comprises a first component which is fixedly mounted relative to the stator and a second component which is fixedly mounted relative to the rotor; one of the first component and the second component comprises a first stopping part; the other one of the first component and the second component comprises a second stopping part and a third stopping part; one part of the first stopping part is positioned between the second stopping part and the third stopping part in the axial direction; and a protective gap of the protecting device is smaller than a working gap of the bearing body. According to the axial magnetic suspension bearing disclosed by the invention, the bearing body and the protecting device can be separated, so that when a magnetic suspension system is unstable, the protecting device is preferably damaged, a complex and precision axial magnetic suspension bearing body is prevented from being damaged, and further the aim of protecting the axial magnetic suspension bearing is achieved.

The invention discloses a dynamic test system of a magnetic levitation system. The system mainly comprises an excitation unit, a node selection unit, a tracking band-pass filter unit, an adaptive identification unit and a frequency property extraction unit. The excitation unit is used for generating swept-frequency excitation signals. The node selection unit is used for selecting excitation inputnodes, superposing the swept-frequency excitation signals in a control system, and simultaneously selecting two measurement signal lead-out nodes according to a measured module. The tracking band-pass filter unit is used for filtering lead-out signals. The adaptive identification unit is used for performing Robust adaptive fitting of the processed node lead-out signals by using the swept-frequency excitation signals. The frequency property extraction unit is used for obtaining a frequency property curve of the measured module according to the fitting result. The system disclosed by the invention is integrated in a magnetic levitation control system; observable points are increased; a certain module in the magnetic levitation control system can be subjected to open-loop and closed-loop dynamic test; any equipment is unnecessary to be increased; the cost is saved; and the test efficiency is increased.

The invention discloses a magnetic suspension system. The system comprises a magnetic base and a suspension magnetic component, wherein the suspension magnetic component comprises an inversed conical base, the magnetic base comprises at least three base magnets and a suspension magnetic component offset control mechanism, the base magnets are uniformly arranged on the periphery of the magnetic base and form an annular matrix, the upper surfaces of the at least three base magnets and a horizontal surface incline to form an inclined angle, the magnetism of the upper surfaces of the at least three base magnets is opposite to the magnetism of a magnetic force surface of the inversed conical base, and an included angle between the inversed conical base and the horizontal surface is equal to the inclined angle. In the magnetic suspension system, the suspension magnetic component with the inversed conical base and the magnets arranged on the magnetic base in an inclining way are used in a combination way, thus, the probability of the suspension magnetic component deviating in a horizontal direction is substantially reduced, the suspension magnetic component is simpler and more convenient to place and operate and is not needed to debug for many times, the corrected frequency and margin of a magnetic field of a control circuit are substantially reduced, the magnetic suspension system is more stable and is difficult to fall off.

The invention discloses a magnetic suspension device. The magnetic suspension device comprises a base and a suspension body, wherein the base is internally provided with an annular magnet; an electromagnetic coil is arranged in the annular magnet; the electromagnetic coil is connected with a control device; the suspension body comprises a power supply, a magnetic field sensing circuit, a circuit control unit and a single electromagnetic coil; the power supply supplies power to the magnetic field sensing circuit, the circuit control unit and the electromagnetic coil; the magnetic field sensing circuit and the electromagnetic coil are connected to the circuit control unit respectively; the magnetic field sensing circuit is used for detecting a magnetic field direction in the base in a movement process of the suspension body, and transmitting a signal to the circuit control unit; and the circuit control unit is used for regulating a current direction of the electromagnetic coil according to the received signal so that the magnetic field direction of the electromagnetic coil and the magnetic field direction of the base keep consistent. Compared with an existing magnetic suspension system, the magnetic field direction and size of the circuit can be controlled through the electromagnetic coil, and the storage difficulty can be reduced; and the suspension height of the suspension body is adjustable.

The invention relates to a control method of an active control type magnetic suspension system free of a position sensor and belongs to the field of control technology of the magnetic suspension system. The control method solves the problem of poor robustness of the existing active control type magnetic suspension system caused by the existence of the position sensor. A current sensor collects current of an electromagnet coil of the magnetic suspension system, an analog to digital (AD) converter converts a current analog signal into a current digital signal, a position evaluation unit performs calculation to obtain a position signal of a suspended solid of the magnetic suspension system according to the current digital signal, the position signal of the suspended solid is compared with a preset expectation position signal to obtain a position deviation signal, and a control signal to a pulse-width modulation (PWM) signal generator is obtained after the controller performs processing on the position deviation signal. Furthermore, the control signal enables the PWM signal generator to generate a voltage pulse signal with corresponding duty ratio to control an electromagnet coil. The control method of the active control type magnetic suspension system free of the position sensor is used for controlling the magnetic suspension system.

The invention discloses a repelling magnetic suspension system, comprising a fixed device 1 and a suspension part 2; the fixed device 1 comprises a fixed platform 3 and an array of solenoid coil 5 arranged on the fixed platform 3; the solenoid coil 5 is internally provided with permanent magnets with the same direction of magnetization; the suspension part 2 comprises a suspension platform 6 and a permanent magnet array adhered to the lower surface of the suspension platform 6; the permanent magnet array adhered to the lower surface of the suspension platform 6 is composed of permanent magnet arrays 7 and permanent magnet arrays 8 which are opposite in directions of magnetization; the permanent magnet arrays 7 are arranged in the right middle of the suspension platform 6 and are distributed annularly; the permanent magnet arrays 8 are arranged at four corners of the suspension platform 6 and are distributed foursquare; and a central position on the upper surface of the suspension platform 6 is provided with an angle transducer 10 which is used for detecting the horizontal angle of inclination of the suspension platform 6. The repelling magnetic suspension system has the characteristics of simple structure, good stability, high positioning accuracy, zero friction and the like.

The invention discloses a method for realizing low power consumption suspension of an axial magnetic bearing, which comprises the following steps: (1) superposing a feedback displacement signal x of a rotor, a given reference position sr and a displacement compensating signal rn to obtain an error signal e; (2) adding the error signal e into a PID adjuster to obtain control current im; (3) amplifying the control current im and inputting the control current im to a permanent magnet biased magnetic bearing; (4) at the same time, adding the im as a feedback signal, a displacement compensating signal ro at the previous moment and a displacement compensating signal roo at the more previous moment output by a two-level storage unit into a low power consumption displacement compensating module to obtain a displacement compensating signal rn; and (5) stacking the rn, the sr and the x to generate the error signal e after the rn is obtained,; at the same time, putting the rn into the storage unit as the ro of the next moment, and putting the ro into the storage unit of next level as the roo of the next moment. Therefore, the whole control flow is circularly operated. The control current in an axial control coil reaches to be minimum, and the method realizes low power consumption.

In adjustment of the control parameters of a magnetic suspension system, an object of the present invention is to provide a technique for adjusting the control parameters to optimum values automatically by employing the iterative feedback tuning method, without increasing the complexity of the program, the amount of calculation and the overall size of the system, and still reducing the amount of calculation required for calculation of the safety margin (gain margin and phase margin). In a method of automatic adjustment of control parameters according to the invention, when applying the iterative feedback tuning method to a feedback control system for a magnetic suspension system, only those control parameters that have a significant effect on the control performance of the system are selectively adopted/discarded from among control parameters so that the control parameters are guided to optimum values to obtain a response waveform desired by a designer directly from input/output data of a control subject.

The invention discloses a magnetic suspension crawler typed linear motor power driving vehicle, comprising a frame, a driving system in the frame and a forward/steering/braking/backward control system. Two sides of the frame are respectively provided with a crawler; a magnetic suspension system is arranged between the crawler and the frame; the driving system is a left linear motor and a right linear motor which are formed by a primary driving system fixed on the frame and a secondary driving system embedded on the crawler; the electromagnetic coil windings of the left linear motor and the right linear motor are electrically connected with a controller through a frequency converter; the forward/steering/braking/backward control system comprises a pulling rod and a pedal which are corresponding to each other, and sensors which are connected with all the pulling rods and the pedals; the sensor is connected with the controller. The power driving vehicle of the invention simplifies mechanism transmission system and has the advantages of environmental protection, fast speed, low cg, strong passing capability, good safety, etc.

The magnetic suspension rotor azimuth microgyro belongs to the field of micro-electro-mechanical technology, and includes right base body, two-side stator coils and sensing electrodes, magnetic substrate, left base body, anti-cohesive column, rotor supporting column and microrotor. The stator coils, sensing electrodes and microrotor are sealed in the cavity formed from left base body and right base body, the magnetic substrates are deposited on the left base body and right base body, on the magnetic substrate the stator coil and sensing electrode are electroplated, and the anti-cohesive column and rotor supporting column are deposited, and the microrotor can be set on the rotor-supporting column by means of its central small hole. Said invention is a magnetic suspension system.

The invention relates to a magnetic suspension bearing system, in particular to an electromagnetic adsorption type protective bearing device which comprises a rotor, a supporting assembly and an electromagnetic drive assembly; the end part of the rotor is provided with a bearing; the supporting assembly is arranged on the radial outer side of the bearing; the supporting assembly and the outer peripheral surface of the bearing are arranged at an interval; the electromagnetic drive assembly comprises an electromagnetic adsorption piece and a drive piece; in an initial state, the drive piece pushes the supporting assembly to be close to and contacted with the bearing under the effect of an elastic piece; and in a normal working state, the electromagnetic adsorption piece generates an adsorption force to drive the drive piece to move far away from the bearing. For the electromagnetic adsorption type protective bearing device, when a magnetic suspension bearing fails, and the rotor falls off, a temporary support is provided to the rotor, damages caused by vibration and impact caused by falling of the rotor are prevented, and the reliability of the magnetic suspension system is improved.

The invention relates to a maglev traction device of a high-temperature superconducting high-speed maglev train, and belongs to the technical field of intelligent devices. The traction device comprises a high-temperature superconducting maglev device and a traction power device; the high-temperature superconducting magnetic levitation device comprises vehicle body rail holding frames installed onthe left side and the right side of a vehicle body bogie, magnetic conductive rails installed on ground rails on the left side and the right side, a feedback control system, an air gap position detection controller, high-temperature superconducting electromagnets and guide electromagnets, wherein the high-temperature superconducting electromagnets and the guide electromagnets are installed on thevehicle body rail holding frames respectively. The traction power device comprises an iron-core-free long-stator permanent magnet synchronous linear motor which comprises two stators, two rotors and two installation supports. Each stator is vertically installed in the center of a ground track, and each rotor is vertically installed between the two sides of the two stators and installed on a bogieof a vehicle body. The problems of large coil volume and weight, serious heating and easy insulation aging in a traditional magnetic suspension structure are avoided, and the structure of a magnetic suspension system is simplified.

The invention discloses a composite magnetism gathering type permanent magnet guide rail mechanism applicable to a high-speed superconductivity magnetic suspension system. The composite magnetism gathering type permanent magnet guide rail mechanism comprises a main magnetism gathering pole formed by a plurality of ferromagnetic materials, a permanent magnet contraposition combination formed by a plurality of permanent magnets, and a permanent magnet guide combination formed by a plurality of permanent magnets. The composite magnetism gathering type permanent magnet guide rail mechanism is characterized in that the main magnetism gathering pole can gather the main magnetic circuit or the main magnetic energy of the permanent magnet guide rail and diffuses towards the space, and the high magnetic conductivity is favorable for inhibiting longitudinal magnetic field gradient; the permanent magnet contraposition combination generates strong magnetic pressure by utilizing the mutual repulsion effect between the magnetic poles of each permanent magnet; and the permanent magnet guide combination has the effects of auxiliarily gathering magnetism and guiding the magnetic circuit, and guides and diffuses the magnetic energy of the permanent magnets to the upper surface of the guide rail and the above region by utilizing the magnetization directionality of the permanent magnets. The composite magnetism gathering type permanent magnet guide rail mechanism obviously improves the utilization ratio of the permanent magnet guide rail magnetic field on the basis of guaranteeing the requirement of the magnetic suspension system on the magnetic field intensity, effectively stabilizes the longitudinal magnetic field gradient caused by the errors or defects of the permanent magnets, and guarantees the safety and the stability of the high-temperature superconductivity magnetic suspension system during operation at high speed and ultrahigh speed.