366 results about "Levitation" patented technology

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.

According to the implantable magnetic suspension blood pump structure, an impeller is suspended in a containing cavity of a pump shell and can rotate around the central axis of the pump shell, and blood is sucked in from an inlet and discharged from an outlet; the motor comprises a motor stator assembly arranged in the pump shell and a rotor magnet array arranged on the impeller. The magnetic suspension device comprises an electromagnet arranged in the pump shell and a suspension magnet assembly arranged on the impeller, and electromagnetic suspension force provided by the electromagnet and passive permanent magnet bias suspension force provided by the suspension magnet assembly jointly maintain suspension balance of the impeller. The motor and the magnetic suspension device are independently controlled, so that the negative influence of low signal detection accuracy caused by magnetic field coupling is effectively reduced; the hybrid magnetic suspension structure reduces power consumption of the magnetic suspension device; the arrangement positions of the motor stator assembly and the electromagnet enable the blood pump to be compact in structure and reduce the size and weight; the gap and the position of the electromagnet and the suspension magnet assembly are accurately controlled, accurate control over the suspension position of the permanent magnet is achieved, and the pumping efficiency and stability of the blood pump are improved.

The invention relates to the technical field of conveying equipment, in particular to a magnetic suspension flexible conveying system which comprises a stator guide rail module, a rotor suspension module, a suspension gas module, a magnetic force driving module, a control module and a detection module. The stator guide rail module comprises an installation support, a guide rail is fixedly installed on the installation support, the rotor suspension module is installed on the guide rail, air guide holes are evenly distributed in the guide rail, an air guide channel communicated with all the air guide holes is formed in the guide rail, and the air guide channel is connected with the suspension air module. According to the application, gas suspension and magnetic force driving are fused, real-time monitoring is realized through the detection module, precise regulation and control are realized through the control module, high-precision positioning and track control of the rotor suspension module are realized, and the requirements of high-precision industries such as electronics and precise instruments are met. According to the non-contact design, friction and part abrasion are greatly reduced, the operation resistance is small, the energy consumption is low, the system stability is high, interference and load change can be rapidly adjusted, and the reliability is high.

The present invention relates to the technical field of automatic control, and provides a unified suppression method for external disturbances and internal levitation force ripples of a magnetic levitation motor system, comprising: acquiring time-varying levitation force data of a magnetic levitation motor, and converting the time-varying levitation force data of the magnetic levitation motor into nominal levitation force feedback data of a time-invariant levitation force; designing a Kalman observer on the basis of the nominal levitation force feedback data; the Kalman observer observing and acquiring external disturbance and internal levitation force ripple data of a magnetic levitation motor system; and forwards feeding and supplementing the external disturbance and internal levitation force ripple data of the magnetic levitation motor system into a levitation control system of the magnetic levitation motor, thereby achieving unified suppression of external disturbances and internal levitation force ripples of the magnetic levitation motor system. The present invention can effectively reduce the influence of external disturbances and internal levitation force ripples on a magnetic levitation switched reluctance motor, thereby effectively improving the levitation precision and the anti-disturbance performance of a magnetic levitation switched reluctance motor system.

A control method and apparatus for a magnetic levitation compressor, an electronic device and a storage medium. The control method comprises: in response to shutdown of a magnetic levitation compressor, acquiring the rotating direction of a rotor; on the basis of the operating state of the magnetic levitation compressor and the rotating direction being the reverse direction, acquiring the rotating speed of the rotor; on the basis of the rotating speed being greater than a first threshold value and not greater than a second threshold value, acquiring a delayed levitation stop duration corresponding to the rotating speed of the rotor; on the basis of a rotation duration of the rotor reaching the delayed levitation stop duration, controlling the rotor to stop levitating; and, on the basis of the rotating speed being greater than the second threshold value, controlling a frequency converter to brake the magnetic levitation compressor. The control method does not need to use valve body members to prevent reverse rotation of rotors of magnetic levitation compressors, thus improving the control stability for magnetic levitation compressors and the operation reliability of magnetic levitation compressors.

The embodiment of the invention provides a flywheel direct-driven cogeneration unit dynamic adjusting system and a control method thereof, in the embodiment of the invention, a magnetic suspension technology is adopted to eliminate friction of a traditional mechanical bearing, and quick starting and stopping of the rotating speed of a flywheel are realized; the high-temperature superconducting magnetic clutch achieves instantaneous mechanical coupling / decoupling of the flywheel and the circulating pump through the zero resistance characteristic, and the response time is short. The frequency modulation requirement of a new energy power grid can be matched, and meanwhile hard constraint of thermal load fluctuation on electric energy output is avoided. The mechanical direct-drive path directly utilizes the kinetic energy of the flywheel to drive the circulating pump, so that a multi-stage energy conversion link in a traditional mode is omitted; the electric adjusting path realizes bidirectional power exchange between the flywheel and a power grid through an energy interface device, and the loss of an inverter is reduced; and the high-temperature superconducting magnetic clutch realizes zero-energy-loss transmission in a coupling state. The magnetic suspension flywheel set adopts a non-contact suspension technology, so that mechanical wear is eliminated; the high-temperature superconducting magnetic clutch achieves non-contact transmission through magnetic coupling, and friction loss is avoided.

A stator core, a stator component, a stator assembly, a levitation motor, a suspension system, and a vehicle. The stator core comprises a stator tooth portion, a stator yoke portion, and a tooth-yoke transition piece, the stator yoke portion being connected to the stator tooth portion, and at least one of the stator yoke portion and the stator tooth portion being a multi-layer structure; the tooth-yoke transition piece is connected to both the stator yoke portion and the stator tooth portion, allowing the stator yoke portion to connect to the stator tooth portion.

An apparatus for contactless transport of a carrier is provided herein. The apparatus includes a carrier that is a substrate carrier or a reticle carrier. The apparatus includes a linear reluctance motor for providing both non-contact suspension and non-contact driving of the carrier. The linear reluctance motor includes one or more linear stators that define a transport track for the carrier. The linear reluctance motor includes a mover attached to the carrier. The linear reluctance motor includes a set of electromagnets and a first magnetic material. The one or more linear stators include a set of electromagnets and the mover includes a first magnetic material, or the mover includes a set of electromagnets and the one or more linear stators include a first magnetic material. The apparatus includes a controller connected to a set of electromagnets.

The invention discloses an anomaly detection method, device and equipment for a maglev train suspension system and a medium, and relates to the technical field of maglev train detection. The method comprises the following steps: acquiring multi-source operation time sequence data of a maglev train suspension system in real time; carrying out automatic feature extraction on the suspension system through a first neural network model to obtain feature vectors used for representing dynamic response behaviors of the suspension system under different working conditions; inputting the feature vector into a trained second neural network model to obtain an anomaly detection score; the second neural network model is a time sequence neural network and is used for outputting a quantitative score value representing the state abnormity possibility of the suspension system according to the input vector; and when the anomaly detection score indicates that the suspension system is in an abnormal state, performing fault mode classification on the abnormal state according to a preset fault classification rule. According to the technical scheme of the invention, the method breaks through the limitation that a conventional method is insufficient in coupling feature extraction, and achieves the precise anomaly detection and fault classification of the suspension system.

The invention discloses a PLC-based high-pressure-ratio magnetic suspension centrifugal heat pump control method and system, and the method comprises the steps: carrying out the self-adaptive sampling rate adjustment through collecting operation data and PLC configuration information, generating a dynamic signal matrix, recognizing a key pressure ratio control loop, and extracting vibration envelope and surge precursor frequency to generate early warning characteristic parameters; reversely adjusting the rigidity damping ratio of the magnetic bearing to determine an anti-surge protection boundary; fin temperature difference detection information is monitored, a partition defrosting map is generated through asymmetric frosting rate analysis, and minimum energy consumption analysis is executed to determine a reversing valve switching time sequence; performing operation characteristic and oil-gas migration coupling analysis to generate oil-gas separation optimization parameters, adjusting a magnetic suspension gap to extract a zero-power-consumption suspension interval, and constructing layered energy-saving control configuration; a preventive maintenance time window is generated through magnetic bearing current ripples, a fault-tolerant degradation operation mode and a self-adaptive control strategy are established, a heat pump control instruction is finally generated, and intelligent control over the high-pressure-ratio magnetic suspension centrifugal heat pump is achieved.

The present invention discloses a magnetic levitation washing machine, comprising a housing and a washing drum disposed within the housing. A magnetic levitation motor is disposed at the bottom of the housing, and a magnetic induction unit is correspondingly disposed in the washing drum. When energized, the magnetic levitation motor interacts with the magnetic induction unit to generate a levitation force that elevates the washing drum and / or a driving force that rotates the washing drum. In the present invention, when energized, the magnetic levitation motor interacts with the magnetic induction unit to elevate and / or rotate the washing drum. This effectively reduces noise generated by vibration during the washing drum's rotation, ensures operational stability, and enhances the user experience. Furthermore, the number of shock-absorbing components is reduced, effectively reducing the weight of the washing machine and lowering production costs.

The invention discloses non-contact suspension stirring equipment and a stirring method thereof. The non-contact suspension stirring equipment comprises a basic fixing assembly, a main transmission assembly, a suspension supporting system and a suspension stirring mechanism. Equipment is fixed to the bottom of a liquid container through a flange and an isolation sleeve, after a motor adjusts the rotating speed to a proper stirring speed through a speed reducer, a main shaft of the speed reducer drives an input shaft to rotate through a coupler to drive a driving rotor shell and a magnet in the driving rotor shell to generate a rotating magnetic field, and a suspension stirring mechanism is driven to rotate through magnetic coupling of an inner magnet and an outer magnet. The suspension supporting system adopts the homopolar repulsion principle to enable the stirring mechanism to be suspended, a sliding bearing is formed through a silicon carbide wear-resistant shaft sleeve, and frictional wear is reduced. Non-contact power transmission between the main transmission assembly and the stirring mechanism is achieved, mechanical seal leakage and pollution are avoided, and the device has the advantages of being resistant to abrasion, low in shearing, low in energy consumption, stable in operation and the like, is suitable for occasions needing sterile and low-shearing stirring such as biological medicine, dairy products and beverages and has wide industrial application value.

The event triggering robust model prediction control method for the maglev train suspension system comprises the following steps: S1, considering the influence of track irregularity interference, and establishing a mathematical model of the maglev train suspension system interfered by the track irregularity; s2, according to the established mathematical model of the suspension system and the state of the balance point of the suspension system, obtaining a tracking error model of the suspension system; s3, establishing an equivalent linear model, and calculating an equivalent state constraint and a control input constraint; s4, designing an event triggering robust model predictive control strategy by considering the state constraint and the control input constraint; s5, verifying recursive feasibility and system stability of the event-triggered robust model predictive control strategy; according to the method, the influence of track irregularity on the suspension system of the electromagnetic suspension train is eliminated, the suspension precision of the suspension system is improved, and the problems of calculation pressure and communication resource shortage caused by high-frequency control in the suspension control process of the magnetic suspension train are relieved on the basis of ensuring the suspension stability of the magnetic suspension train.

The invention provides a voice coil motor. The voice coil motor comprises a base, a stator assembly and a rotor assembly. The stator assembly comprises a coil assembly and an adjusting assembly, the coil assembly comprises a coil support and a coil, the coil support is cylindrical and is installed on the base, and the coil is wound on the outer side wall of the coil support. The adjusting assembly is arranged in the coil support and comprises a cylindrical adjusting support and adjusting magnetic steel installed on the adjusting support in a sleeving mode, and the adjusting support is connected with the base in the mode that the position can be adjusted in the axial direction. The mover assembly comprises a mover support and mover magnetic steel installed on the mover support, and the mover magnetic steel is arranged on the outer side of the stator assembly in a sleeving mode. According to the voice coil motor, the adjusting magnetic steel capable of moving in the axial direction is arranged in the stator assembly, the axial position of the adjusting magnetic steel is changed, the magnetic levitation force is adjusted, the gravity compensation range is expanded, the burden of lorentz force generated by coil electrification for levitation compensation is shared, coil current stability is kept, heating is reduced, precision is improved, and the response speed is increased; and the size of the motor is not increased.

The utility model discloses an auxiliary suspension and guide system based on a Halbach array. The auxiliary suspension and guide system based on the Halbach array comprises a suspension piece and a fixing piece. The suspension part comprises a T-shaped framework, an adjustable telescopic device, a rotary motor, an annular Halbach array and a rectangular Halbach array; the fixing piece comprises a bottom magnetic rail, a side magnetic rail and a U-shaped frame. When the rotary motor runs, the annular Halbach array is driven to rotate to interact with the side magnetic track, required guiding force and driving force are provided, the distance between the rectangular Halbach array and the bottom magnetic track can be adjusted through the telescopic rod, and required suspension force is provided. According to the utility model, the condition of transportation load is optimized, the equipment loss caused by contact friction is greatly reduced, the energy loss is reduced, and the stability and the precision of operation are improved.

Disclosed in the present invention are a magnetic-levitation spatial curved beam molding system and molding method. The magnetic-levitation spatial curved beam molding system comprises: a side mold assembly; and functional part mold plate assemblies, wherein two functional mold plate assemblies are correspondingly arranged on two side mold plates, respectively, each functional part mold plate assembly comprises functional part mold plates used for locating a magnetic levitation functional part and at least two vertical adjustment assemblies, and driving ends of vertical adjustment parts are movably fitted with the bottoms of the functional part mold plates, respectively so as to adjust the spatial locations and angles of the functional part mold plates. The functional mold plate assemblies are provided to locate and mount the magnetic levitation functional part, and the vertical adjustment assemblies and lateral adjustment parts are provided to implement any adjustment of the spatial angles and locations of the functional part mold plates, so as to satisfy the requirement of adjusting the spatial location of the magnetic levitation functional part on a spatial curved beam, such that the arrangement location of the magnetic levitation functional part can be better matched with the structure of the spatial curved beam, and the molding precision of the spatial curved beam is ensured.

This invention relates to a closed-loop measurement device and method for the angular velocity of a micro-gyroscope based on a single-beam optical trap, belonging to the field of inertial navigation technology. It includes a vacuum cavity, a micro-gyroscope, an optical trap levitation module, a rotation detection module, and a feedback control module. The micro-gyroscope is placed inside the vacuum cavity, and the optical trap levitation module is positioned below the vacuum cavity. The optical trap levitation module can converge a first laser beam from bottom to top into the vacuum cavity to form a vertical optical trap, thus leviting the micro-gyroscope. The rotation detection module can horizontally converge a second laser beam onto the micro-gyroscope and split the second laser beam, after its polarization direction has been changed by the rotating micro-gyroscope, into two laser beams with different intensity ratios. The feedback control module can analyze the intensity ratio of the two laser beams and provide feedback control to the rotational angular velocity of the micro-gyroscope. This invention features high bandwidth, low noise, and high accuracy.

This utility model belongs to the technical field of vertical wind turbines, specifically a vertical wind turbine with a support assembly. It includes a support rod, a generator body fixedly connected to the top of the support rod, a support frame fixedly connected to the top of the generator body, a first magnetic ring fixedly connected to the inner wall of the support frame, a second magnetic ring at the top of the first magnetic ring, and a connecting shaft fixedly connected to the output end of the generator body to the outer wall of the second magnetic ring. This utility model utilizes rollers; wind power drives the connecting frame to rotate via a wind vane, causing the rollers to roll along the top of the connecting seat, facilitating support of the connecting shaft. The rotation of the connecting frame drives the generator body through the connecting shaft, converting wind energy into electrical energy. Simultaneously, the first and second magnetic rings provide levitation support for the connecting shaft, improving its stability and preventing deformation due to excessive force.

The invention relates to a wheel hub motor, in particular to an anti-magnetic-pulling-force and anti-deformation axial end face motor, and solves the technical problem that a rotor structure of an existing axial magnetic flux motor cannot resist attraction force of a rotor permanent magnet to stator teeth, so that the rotor structure is deformed. The axial end face motor capable of resisting magnetic pulling force and preventing deformation comprises a motor shaft, a rotor assembly, a stator assembly and a magnetic suspension assembly. The magnetic suspension assembly comprises two magnetic ring seats, 2K movable magnetic rings, 2K static magnetic rings and a plurality of adjusting bolts, wherein K is greater than or equal to 1; the two magnetic ring seats are respectively arranged in the first rotor magnetic ring groove and the second rotor magnetic ring groove through adjusting bolts, and the adjusting lengths of the two magnetic ring seats along the axial direction are equal; 2K moving magnetic rings are equally divided into two groups and are respectively adsorbed on the end surfaces, facing the stator, of the two magnetic ring seats; 2K static magnetic rings are equally divided into two groups and are respectively arranged in the first stator magnetic ring groove and the second stator magnetic ring groove, and the magnetic poles of the opposite end surfaces of the static magnetic rings and the movable magnetic rings are the same to form an axial suspension state.

This invention proposes a dual-closed-loop control method for the dynamics of a magnetically levitated energy storage flywheel rotor based on LADRC (Laser-Adjustable Dynamic Control) to achieve stable levitation and dynamic control of the flywheel rotor. First, mathematical models of each degree of freedom of the flywheel rotor and a linearized model of the power amplifier-electromagnet coil are established in the magnetic bearing coordinate system. Then, the electromagnetic coupling terms, gyroscopic coupling terms, and imbalance terms in the flywheel rotor mathematical model are defined as external disturbances. Mathematical models of the flywheel rotor and power amplifier-electromagnet coil used for controller design are derived, and a second-order LADRC controller for the position loop and a first-order LADRC controller for the current loop are designed. Finally, the parameters of the position loop and current loop controllers are tuned using the pole placement method. Simulation results show that this dual-closed-loop control strategy can effectively decouple the degrees of freedom of the flywheel rotor under static and high-speed levitation conditions. Compared with PID control, it has better dynamic characteristics and stronger anti-disturbance capability. This is of great significance in ensuring the stable and reliable operation of the magnetically levitated energy storage flywheel rotor.

A recursive RISE control method and system for maglev train levitation systems is disclosed. The control method includes: constructing the dynamic equations and voltage balance equations of the electromagnets based on a single-point levitation system, and then constructing a dynamic model of the single-point levitation system accordingly; designing a virtual control law, and then designing a recursive RISE controller based on the backstepping method by combining the dynamic model of the single-point levitation system and the virtual control law; performing stability analysis on the RISE controller to obtain its stability conditions; and, based on satisfying the stability conditions, using the RISE controller to perform real-time control of the levitation gap of the maglev train levitation system. This invention has excellent anti-interference capabilities, reducing the impact of external interference or model uncertainty on levitation accuracy. Furthermore, by handling the nonlinear relationship between voltage and current through the backstepping method, this invention avoids the model mismatch problem caused by linearization.

The invention relates to an airborne laser three-dimensional scanner control method and system and a scanner, and relates to the technical field of scanners, and the method comprises the steps: collecting the environment detection information of a detection range; scanning movement parameters are obtained according to the detection range and the environment detection information; the environment wind speed is called from the environment detection information; obtaining scanning suspension power in combination with the environment wind speed, the scanning movement parameters and the scanning specification; comparing exceeding conditions of the scanning suspension power and the reference suspension power to calculate deviation suspension power; obtaining a escort number and an air curtain parameter based on the deviation suspension power, the scanning movement parameter and the scanning specification; and combining the scanning specification and the scanning movement parameter to obtain a scanning range, acquiring scanning information of the scanning range according to a scanner of the scanning unmanned aerial vehicle to refresh the air curtain parameter, and controlling the escort unmanned aerial vehicle with the escort number to cooperatively fly with the scanning unmanned aerial vehicle according to the air curtain parameter. The method has the effect of improving the scanning accuracy of the airborne laser three-dimensional scanner.

The utility model relates to the technical field of high-altitude platforms, and discloses an arc convolution platform attached to a high-altitude bridge. The keel frame is fixedly connected to the side, provided with the arc-shaped plate, of the horizontal plate, the keel frame comprises a variable-curvature sector ring frame, the variable-curvature sector ring frame comprises an outer arc edge, an inner arc edge and two ring wide edges, the inner arc edge is attached to the outer edge of the arc-shaped plate, and the curvature and the arc length of the outer arc edge are larger than those of the inner arc edge; the tempered glass plate is fixedly installed on the keel frame and comprises an outer arc edge, an inner arc edge and two annular wide edges, the inner arc edge is attached to the inner arc edge, the annular wide edges are longer than the annular wide edges, the curvature of the outer arc edge is the same as that of the outer arc edge, and the arc length of the outer arc edge is larger than that of the outer arc edge; the technical problem that an existing sightseeing platform cannot be used for stage performance and cannot meet the suspension effect is solved.

An intermediate axis theorem demonstration device for teaching the intermediate axis theorem includes an object, an actuator, and a levitation module. The object has a primary, secondary axis, and intermediate axes of rotation, each having moment of inertia with that about the intermediate axis being greater than that about the secondary axis and less than that about the primary axis of rotation. The actuator is releasably engageable to the object to initiate rotation of the object about its intermediate axis. The object is selectively positionable upon the levitation module, which counteracts a gravitational force upon the object to maintain the object in a substantially fixed position while rotating about its intermediate axis of rotation. An observer thus can observe rotation of the object about its intermediate axis of rotation and intermittent 180° rotation of the object about its primary axis of rotation.

This invention discloses a fault-tolerant control method for a modular bearingless electrically excited doubly salient pole motor under fault conditions, relating to the field of fault-tolerant control for bearingless electrically excited doubly salient pole motors. This scheme uses a three-phase full-bridge converter to control the switching transistors, enabling the three-phase full-bridge converter to operate alternately as a single-phase bridge inverter circuit under normal and fault conditions of the switching transistors, achieving fault tolerance of the switching transistors in the toroidal DC winding control circuit. Under the condition of open circuit and loss of excitation in the toroidal DC winding, fault-tolerant control of rotor levitation of the modular bearingless electrically excited doubly salient pole motor is achieved through the reuse of the armature winding. The method includes a three-phase full-bridge converter control strategy for fault-tolerant control of the modular bearingless electrically excited doubly salient pole motor and an armature winding reuse control strategy for fault-tolerant control of the modular bearingless electrically excited doubly salient pole motor. This further improves the fault tolerance capability of the modular bearingless electrically excited doubly salient pole motor.

This utility model discloses a packaging mold for a suspended guide coil, relating to the field of mold packaging technology. The device includes a material carrier plate; the material carrier plate has a material-carrying cavity inside, and the top and bottom of the material-carrying cavity are respectively provided with a first mounting limiting groove and a second mounting limiting groove. The first and second mounting limiting grooves are respectively fitted with a first molding component and a second molding component, which support the top and bottom coils. A lead wire support assembly is provided below the bottom coil. The packaging mold for the suspended guide coil of this utility model, through the mutual cooperation of various structures / components in the lead wire support assembly, ensures the parallelism of the three lead wires during the packaging process, effectively avoiding deformation under external force and improving the packaging accuracy of the coil.

The invention discloses a magnetic suspension motor suspension center calibration method and system, an electronic device and a medium, when rotor calibration is carried out, compensation is carried out in real time through a DA converter, the calibration frequency can be reduced, the efficiency can be improved, calibration can be rapidly completed, and the calibration time can be saved; the rotor automatically rotates by a corresponding angle in the calibration process, calibration can be rapidly completed and gain and offset can be accurately calculated through the calibration method, and the problems that the protection bearing is poor, whether the protection bearing and the magnetic bearing are concentric or not and whether the rotor is bent or not can be found through calibration.

The invention discloses a non-contact current compensation method for a high-temperature superconducting electric suspension magnet. The non-contact current compensation method specifically comprises the steps that zero-flux suspension coils are installed on a ground track at equal intervals in the train running direction; the low-temperature system is composed of an outer Dewar, a radiation screen and a refrigerating machine. The vehicle-mounted superconducting magnet is directly conducted and cooled through a refrigerating machine, and the vehicle-mounted power generation coil and the vehicle-mounted excitation coil are installed on the outer side and the inner side of the outer Dewar respectively. The surface of the radiation screen is provided with a high-temperature superconducting tape, and two ends are connected with a vehicle-mounted superconducting magnet to form a closed loop. When a train runs, the vehicle-mounted superconducting magnet induces current in the suspension coil, the vehicle-mounted power generation coil generates power by using a harmonic magnetic field of the suspension coil, the vehicle-mounted excitation coil generates a traveling wave magnetic field and induces voltage on the high-temperature superconducting strip, and based on the magnetic flux quantum coupling theory, the induced voltage has a direct-current component. The vehicle-mounted superconducting magnet is excited, and attenuation of magnet current is compensated. According to the invention, efficient and stable non-contact direct current compensation of the vehicle-mounted superconducting magnet is realized.

To provide a sheet feeding apparatus capable of stably performing air-based levitation separation even for a medium having a high basis weight, by controlling a direction of air blown onto the medium in an air pickup system.SOLUTION: A sheet feeding apparatus, which levitates the uppermost sheet of a stack of multiple sheet-like media with a gas and feeds it downstream in a conveying direction, comprises: a sheet accommodating unit configured to stack and hold the multiple sheets; a gas blowing unit configured to blow gas onto the uppermost sheet; and a wind direction control unit configured to control the blowing direction of the gas from the gas blowing unit according to the characteristics of the medium.SELECTED DRAWING: Figure 5

One or more system and associated methods for installing a line spacer upon adjacent lines that are suspended are provided. A system includes a portion for holding and releasing the line spacer onto the lines. The system includes a portion for actuating securing portions of the line spacer to secure the line spacer upon the lines. The system includes a flying drone portion for levitation of the portion for holding and the portion for articulating to the lines.