125 results about "Superconducting Coils" patented technology

This invention belongs to the field of nuclear magnetic resonance technology and discloses a compact superconducting coil heat transfer structure and a liquid helium-free superconducting magnet. The compact superconducting coil heat transfer structure, applied to a liquid helium-free superconducting magnet, includes a tubular superconducting coil winding frame. A flattened superconducting coil assembly is wound around the outer surface of the superconducting coil winding frame via grooves. A heat transfer plate is provided on the outer side of the superconducting coil winding frame, and an end-face heat-conducting plate is provided at each end of the superconducting coil winding frame. Each end of the heat transfer plate is connected to the corresponding end-face heat-conducting plate, and a heat transfer metal plate is connected to both end-face heat-conducting plates. The heat transfer metal plate is in contact with the superconducting coil assembly to form a closed heat transfer loop. This invention has a compact overall structure and, through the heat transfer plates, significantly reduces the risk of excitation quench, improving the ease of use and stability of the equipment.

To improve the accuracy of measuring pressure inside a helium container. [Solution] A magnetic resonance imaging apparatus according to one embodiment comprises a superconducting coil, a helium container, a first pressure gauge, a second pressure gauge, a valve, and a control circuit. The superconducting coil generates a static magnetic field. The helium container houses liquid helium for cooling the superconducting coil together with the superconducting coil. The first pressure gauge measures the pressure inside the helium container within a first pressure measurement range. The second pressure gauge measures the pressure inside the helium container within a second pressure measurement range that is narrower than the first pressure measurement range. The valve switches the second pressure gauge to be used for measuring the pressure inside the helium container. The control circuit controls the opening and closing of the valve based on the measurement value of the first pressure gauge.

The utility model provides a kind of control system and superconducting magnet of superconducting magnet, and the intermediate node of the current drop resistor in its current drop circuit is connected to one end of the current drop resistor by second switch, and the resistance in current drop circuit can be adjusted by controlling the state of second switch, when quench protection, open second switch, maximize current drop power;When the current of coil is current drop adjusted, control second switch is closed, reduce current drop power, adapt current drop adjustment demand, and response is fast.The superconducting magnet of the utility model can provide a variety of different current drop power, increase the regulation and control precision when superconducting magnet coil is abnormal or quench, can effectively improve work stability and monocrystalline silicon crystal pulling quality.

This invention relates to the field of high-speed magnetic levitation transportation technology and discloses a test device for a ground module of a magnetic levitation electromagnetic propulsion system. The device includes a superconducting magnet, a ground test bench, a frequency converter, a through-core transformer, a high-voltage generator, connecting leads, dry-type terminals, and two power supply cables for the tested module. The tested ground module and the superconducting magnet are arranged opposite each other on the ground test bench. One end of the power supply cable for the tested module is equipped with a dry-type terminal, and the other end is connected to the lead-out end of the propulsion coil of the tested ground module. The dry-type terminal of one power supply cable passes through the through-core transformer and is connected to the dry-type terminal of the other power supply cable through a connector to form a conductive loop. The connection point of the dry-type terminal is connected to the high-voltage generator through connecting leads. The frequency converter is connected to one vertical side of the through-core transformer. The shielding shell of the tested ground module and the shielding layer of the tested power supply cables are grounded. This allows for multi-field coupling durability testing.

The application discloses a method for evaluating the conductive behavior of an inter-turn insulation layer of a superconducting magnet during short circuit arc propagation, comprising: constructing a reference simulation structure consistent with the geometric structure of an experimental sample; configuring a plurality of different conductivity sub-models for the simulated insulation elements corresponding to the conductor inter-insulation layer of the experimental sample in the reference simulation structure to obtain a plurality of experimental simulation models with different conductive characteristics; respectively simulating the application of a preset direct current consistent with the arc test to the plurality of experimental simulation models to determine a plurality of simulation results; performing fitting degree analysis on the plurality of simulation results and the experimental results, and selecting a target simulation model with the highest fitting degree from the plurality of experimental simulation models; and evaluating the conductive behavior of the inter-turn insulation layer according to the conductivity sub-model corresponding to the target simulation model. In this way, the influence of the arc on the conductive behavior of the insulation layer can be analyzed by comparing and fitting the experimental results with the plurality of simulation results, thereby providing a basis for short circuit arc risk evaluation.

The application provides a quench protection circuit, which is suitable for quench protection of a superconducting device. The quench protection circuit comprises: a diode branch, which is connected in parallel with a superconducting coil branch in the superconducting device, and comprises a plurality of forward diodes and at least one reverse diode; the plurality of forward diodes are connected in series and connected in parallel with the reverse diode; and the sum of voltage drops of the forward diodes is greater than or equal to an operating voltage between the superconducting coil branch; and a release branch, which is connected in parallel with the diode branch and the superconducting coil branch. The quench protection circuit can protect both insulated superconducting coils and uninsulated superconducting coils, and can be suitable for quench protection of different types of superconducting coils.

The application relates to the technical field of superconducting magnet field measurement, and discloses a superconducting magnet field measurement device, which comprises a supporting base, the outer side of the supporting base is fixedly connected with a tooth ring, a driving assembly is engagedly installed on the outer surface of the tooth ring, the top end of the driving assembly is fixedly connected with a sliding table, a measuring groove is arranged in the middle of the supporting base, an annular groove is arranged in the inner wall of the middle of the placing table, a sliding block is slidably connected in the annular groove, the bottom of one end of the sliding table is fixedly connected with the sliding block, a lifting mechanism is installed above the sliding table, and a support for placing a measurer is fixed at the top end of the lifting mechanism. The driving electric push rod can drive the measurer to move up and down together with the support, the magnetic field change in the vertical direction can be measured, all data can be measured in sequence, and the effect of multi-position measurement is achieved, and the measurement efficiency is improved.

The invention relates to a magnet device (11) for a magnetic resonance apparatus (10), the magnet device (11) comprising: a superconducting magnet (12); a discharge system (35); a switch (37) which is designed to interrupt a closed circuit in the superconducting magnet (12) and to transfer electrical energy which has accumulated in the superconducting magnet (12) to the discharge system (35); wherein the discharge system (35) comprises a supercapacitor (30) which is designed to buffer the electrical energy transport from the superconducting magnet (12) to the discharge element in the discharge system (35).

This application provides an anti-deformation design method and apparatus for welded structures, relating to the field of superconducting magnet technology. The method includes: constructing a three-dimensional structural model of the weld seam; performing thermo-mechanical coupling analysis and stiffness analysis on the three-dimensional weld seam model to determine the inherent deformation caused by the welding process and the impact load deformation caused by service impact loads; determining anti-deformation parameters to compensate for the total deformation of the welded structure based on the inherent deformation and impact load deformation; and determining the geometric parameters of the welded structure based on the anti-deformation parameters. Therefore, this method suppresses deformation failure of the welded structure caused by the superposition of dynamic loads, extends the service life of the welded structure, and thus improves the operational reliability of the superconducting magnet cryogenic thermostat and even the entire high-speed maglev train.

A magnetic resonance imaging (MRI) device (100) includes an electrically superconductive coil having an opening to receive a subject, and a magnetically-actuated contactor 306. The magnetic contactor (306) has a ferromagnetic plunger (320) and a ferromagnetic yoke (302) disposed over the ferromagnetic plunger (320). The ferromagnetic yoke (302) has four sides, with two of the four sides (312, 316) have substantially less surface area than the other two of the four sides. An external magnetic field is oriented to be substantially perpendicularly to the two sides (312,316) having substantially less surface area.

The application relates to a robust optimization design method of an airborne high-temperature superconducting generator, which comprises the following steps: a baseline design scheme is obtained by establishing a two-dimensional electromagnetic finite element baseline model and a total loss accounting model of the generator containing electromagnetic characteristics of superconducting coils; a feasible technical scheme set is obtained by performing scheme screening on pre-engineering hard constraints; an optimal candidate scheme is determined by performing fast optimization on the feasible domain by using a Taguchi orthogonal test, and the optimal candidate scheme is determined by main effect and range analysis or signal-to-noise ratio calculation; and a final design scheme is determined by taking the minimum performance fluctuation or the maximum signal-to-noise ratio as a criterion by introducing cold end temperature fluctuation, air gap assembly deviation, tape critical current dispersion and load and speed disturbance as noise factors for robust verification. The application can efficiently obtain an optimal design with high performance, strong engineering feasibility and operation robustness under limited simulation resources, and is especially suitable for a megawatt airborne high-temperature superconducting power generation system.

The utility model discloses a kind of winding production lines suitable for three-dimensional superconducting coil of star imitator, including the setting of line release device, centering calibration device, conductor straightening device, sand blasting device, follow-up support device and winding device in sequence. After superconducting conductor is released from line release device, it is transmitted in sequence through centering calibration device and carries out centering calibration, then it is transmitted to conductor straightening device and carries out straightening, after straightening, it is conveyed to sand blasting device and carries out sand blasting treatment to the outer wall portion of superconducting conductor, after the sand blasting treatment of superconducting conductor, it is wound on winding mold of winding device after follow-up piece, finally, it is wound and formed three-dimensional superconducting coil of star imitator. When winding three-dimensional superconducting coil of star imitator, when superconducting conductor produces deviation or swing, follow-up piece can be synchronous with the movement of superconducting conductor Activity, provide stable dynamic support to follow-up support device, can improve the winding quality of superconducting coil, reduce the risk of coil winding failure.

By extending the lifespan of the refrigeration unit and reducing the frequency of replacement, the operating rate of the MRI system will be improved. [Solution] The cold head life extension mode is implemented. In the cold head life extension mode, the refrigerator's displayer is operated at a constant frequency lower than a predetermined upper frequency, regardless of the temperature of the superconducting coil, and the compressor inverter controls the drive frequency of the compressor drive unit according to the temperature of the superconducting coil.

This invention discloses a seven-degree-of-freedom intelligent winding system and method for superconducting magnets suitable for complex irregularly shaped coil frames. The system includes a main frame, a six-axis collaborative robotic arm, a seventh-axis servo cylinder, an integrated multi-functional end effector, a superconducting wire feeding and pre-processing unit, a coil frame positioning and installation unit, and a central integrated control system. The working radius of the six-axis collaborative robotic arm covers the entire space of the small-sized magnet winding station. The seventh-axis servo cylinder works in conjunction with the six-axis collaborative robotic arm to achieve follow-up motion, completing the coil winding work for large-sized magnets. The central integrated control system is based on an industrial PC and a real-time Ethernet bus, integrating a robot control system, motion control card, and tension controller. This invention, through its pioneering seven-axis linkage integrated automatic winding process, reduces the manufacturing cost of irregularly shaped magnets, meets the high-efficiency manufacturing requirements of ultra-large-scale coils, and features a high degree of automation, significantly improving the winding quality and yield of superconducting coils.

This invention relates to the fields of cryogenic engineering and superconducting applications, and discloses a superconducting magnet system using a liquid neon pulsating heat pipe for nitrogen-fixed cooling. The system includes a vacuum chamber, a nitrogen-fixing chamber within the vacuum chamber, a high-temperature superconducting magnet within the nitrogen-fixing chamber, a refrigerator, a T-shaped cooling block connected to the refrigerator's cold head, and a liquid neon cryogenic pulsating heat pipe. The liquid neon cryogenic pulsating heat pipe is thermally connected to the T-shaped cooling block and to the outer wall of the nitrogen-fixing chamber. The high-temperature superconducting magnet exchanges heat with the nitrogen-fixing chamber through nitrogen fixation within the chamber, and the heat is then transferred to the outer wall of the nitrogen-fixing chamber via the liquid neon cryogenic pulsating heat pipe, and then further transferred to the high-temperature superconducting magnet via nitrogen fixation. By placing the liquid neon cryogenic pulsating heat pipe on the outer wall of the nitrogen-fixing chamber, and transferring the refrigerator's cooling capacity sequentially through the T-shaped cooling block, the liquid neon cryogenic pulsating heat pipe, the outer wall of the nitrogen-fixing chamber, and the nitrogen fixation to the high-temperature superconducting magnet, a cooling path combining the liquid neon cryogenic pulsating heat pipe and nitrogen fixation is constructed.

1. The name of the design product: voltage signal collector (single channel). 2. The use of the design product: high-speed voltage signal collection in the fields of nuclear fusion plasma diagnosis, fusion device and high-temperature superconducting magnet monitoring, industrial testing, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

This invention discloses an adaptive system and control method for starting a superconducting magnet cold head, relating to the field of superconducting magnet technology. The adaptive system for starting a superconducting magnet cold head includes: a cold head, a frequency converter, and a control unit. The cold head is used to cool the superconducting coil and includes a drive motor that drives a piston inside the cold head to reciprocate for cooling. The frequency converter is electrically connected to the drive motor and is used to adjust the operating frequency of the drive motor. The control unit is signal-connected to the frequency converter and is configured to: when a restart is detected after the cold head has stopped, control the frequency converter to drive the drive motor to operate at a first frequency lower than a preset operating frequency; and when preset conditions are met, control the frequency converter to drive the drive motor back to the preset operating frequency. This configuration avoids the instantaneous heating shock that occurs inside the cold head when the superconducting magnet restarts after a cold head stop, which could cause a sharp rise in the temperature of the superconducting coil and lead to quench failure.

The application provides a design method and device of a super-deep cold component thermal cutoff part and related equipment, and comprises the following steps: establishing a design domain of a thermal cutoff part on a main support structure connected with a liquid nitrogen cavity and an outer Dewar cavity; obtaining a target distribution position of the thermal cutoff part through thermal coupling topological analysis; performing parameterized modeling at the target distribution position; performing parameter optimization to obtain a target shape of the thermal cutoff part; and checking the thermal cutoff part with the target shape at the target distribution position. The design method optimizes the distribution position and shape of the thermal cutoff part, specifically, the optimal distribution position of the thermal cutoff part is determined by using a structure topological optimization method, and the optimal shape of the thermal cutoff part is determined by using a structure parameter optimization method, so that the heat from the outside is as low as possible to be transmitted to the superconducting coil.

This invention relates to the field of superconducting motor technology, and in particular to a low-loss superconducting motor and its design method. The low-loss superconducting motor includes a vacuum chamber, a stator assembly, and a mover assembly. The stator assembly includes a stator support frame with a planar top structure and a superconducting coil disposed on the planar structure. A protective cover is disposed above the superconducting coil, and a radiative heat shield is disposed on the protective cover. The mover assembly is disposed between the protective cover and the radiative heat shield. The mover assembly includes a frame-shaped mover support frame and a constant conductor coil. The temperature of the constant conductor coil is controlled by controlling the emissivity of the radiative heat shield, and the surface emissivity of the protective cover is used to cool the constant conductor coil. The invention also discloses a design method based on a low-loss superconducting motor. The air gap between the stator assembly and the mover assembly is small, which facilitates the achievement of a high magnetic field, reduces the Joule loss of the constant conductor coil, eliminates the need for air or water cooling pipes, and facilitates temperature control.

This invention discloses a frameless superconducting magnet coil fabrication apparatus and process, belonging to the field of power industry technology. The apparatus includes a splicing frame and a supporting fixture. The splicing frame is positioned outside and surrounds the supporting fixture. After the frameless superconducting magnet coil is fabricated, the splicing frame and the supporting fixture are separated. The splicing frame includes a frame cylinder, which is mechanically divided into three parts with beveled cuts for disassembly. The three parts are assembled into a single cylinder to provide radial support for the winding of the superconducting magnet coil. The supporting fixture includes a winding fixture shaft, multiple support plates, and multiple support rods. One end of each support rod is fixed to the winding fixture shaft, and the other end is connected to a support plate. The support plates expand outward to support the frame cylinder. This invention, through the mechanical structure design of a split cylinder, achieves low-cost fabrication of frameless superconducting coils at room temperature. The process is simple, greatly reducing cost, process complexity, and operational difficulty.

This invention discloses a method and system for optimizing the magnetic field of a counterpolar high-temperature superconducting magnet device, relating to the field of induction heating technology. The method includes: acquiring induction heating characteristic numbers of the counterpolar high-temperature superconducting magnet device to be optimized; determining the type of the counterpolar high-temperature superconducting magnet device based on the induction heating characteristic numbers, and determining the core topology and optimization parameter set within the counterpolar high-temperature superconducting magnet device based on the type of the device; and determining the target parameter combination for magnetic field optimization from the optimization parameter set according to preset rules, using the temperature distribution of the counterpolar high-temperature superconducting magnet device after heating as the optimization objective. This invention solves the problems of poor adaptability, low magnetic field control precision, and low efficiency of multi-parameter optimization in existing technologies for optimizing the magnetic field of counterpolar high-temperature superconducting magnet devices.

The technology described herein is directed towards a cryogenic magnet-less circulator device, in which the circulator device is based on the spatiotemporal modulation of angular momentum for microwave photons, controlled using a modulated control signal. The circulator device is configured for integration with a quantum computer, e.g., to facilitate qubit measurements. The circulator topology and design are based on tank circuits, e.g., arranged in a star topology with different sets of radio frequency superconducting quantum interference devices (rf-SQUIDS) per tank circuit, that resonate out-of-phase based on the modulated control signal. The circulator can be fabricated on a layered superconducting chip using standard semiconductor processes, allowing one or more circulators to be integrated on the same superconducting chip as the qubits. A classical computer can be used to output the modulated control signal, and adapt the modulated control signal as needed under varying conditions.

This invention belongs to the technical field of superconducting motor quench detection, and more specifically, relates to a superconducting motor quench detection method based on terminal voltage differential and unsupervised autoencoder. The method includes: acquiring the terminal voltage signal of a superconducting magnet; suppressing induced voltage interference through moving average differential processing; and obtaining a preprocessed signal after filtering; inputting this signal into a pre-trained unsupervised autoencoder model, which consists of an encoder and a decoder. The encoder extracts deep features through a convolutional neural network, a bidirectional long short-term memory network, and an attention mechanism; the decoder performs sequence reconstruction; and by calculating the reconstruction error and comparing it with an adaptive threshold, the quench state is detected and located. This invention solves the problem that the quench judgment threshold often relies on empirical settings and is difficult to adapt to the complex and ever-changing dynamic operating conditions of the motor.

A superconducting magnet device includes a plurality of superconducting coil excitation circuits which each include a superconducting coil and an exciting power supply thereof and are operable independently of each other, a plurality of quenching detectors each of which detects quenching of the superconducting coil of a corresponding superconducting coil excitation circuit, and a controller that, when at least one of the plurality of quenching detectors detects the quenching, controls the exciting power supply of a superconducting coil excitation circuit in which the quenching is not detected among the plurality of superconducting coil excitation circuits to demagnetize the superconducting coil of that superconducting coil excitation circuit.

This utility model relates to the field of superconducting magnet technology and discloses a liquid helium-free zero-evaporation superconducting hollow magnet, including a shell. A first support column is fixedly connected inside the shell. A hinge is fixedly connected to the outer wall of the first support column. A second support column is fixedly connected to the outer wall of the hinge. The outer wall of the second support column is disposed on the outer wall of the first support column. A caster wheel is provided on the lower surface of the second support column. A first fixing block is fixedly connected to the outer wall of the second support column. A support assembly is provided on the outer wall of the first fixing block. The support assembly is used to support the caster wheel for movement. In this utility model, by pushing the hook, the second fixing block rotates, and the first spring is compressed as the second fixing block rotates. Finally, the shell can be moved or fixed in place, allowing for flexible position adjustment, making the spatial layout more reasonable, improving space utilization, and enhancing the comfort of the working environment.

The application provides a self-coupling superconducting magnet quench protection system and method, comprising: a plurality of protection units and a decision unit; each superconducting coil in a superconducting magnet system is connected with a protection unit; the protection unit is used for providing a protection action for the superconducting coil in quench; the decision unit is connected with a main loop switch of the superconducting magnet system and the protection unit; the decision unit is used for detecting the superconducting coil and controlling the protection unit. The application solves the problems in the prior art, such as that the quench protection strategy cannot only discharge the quench coil quickly, that an additional secondary coil needs to be wound, and that the coupling degree between the secondary coil and the superconducting coil is insufficient, and the like, and the application utilizes the electromagnetic coupling between the superconducting coils in the magnet to transfer part of the energy stored in the quench coil to the non-quench loop, effectively accelerates the discharge process of the quench coil, and takes into account the rapidity, flexibility and safety of the protection.

The application discloses a superconducting magnet self-short-circuit excitation current lead base and a mounting and using method thereof, relates to the technical field of superconducting magnets, and comprises a fixing seat, a non-fixed positive and negative plug-in assembly is arranged at the inner end of the fixing seat, elastic expansion assemblies are arranged at the upper and lower ends of the non-fixed positive and negative plug-in assembly and are in contact with each other, a current lead rod is inserted into the non-fixed positive and negative plug-in assembly, thereby supporting apart the outer end of the non-fixed positive and negative plug-in assembly, the positive and negative poles of the non-fixed positive and negative plug-in assembly are no longer in contact, a break and short-circuit state switching is formed, the positive and negative poles of the current lead base are in good contact, and the positive and negative poles are rapidly and automatically short-circuited after the current lead rod is pulled out, the problem that it is very difficult to insert the current lead rod and the problem that the positive and negative poles are not in contact are solved, the short-circuit joint does not need to be inserted into the current lead base by using a tool, the positive and negative poles are kept in a short-circuit state, when excitation is needed, the short-circuit joint does not need to be taken out and inserted into the current lead rod by using a tool, the operation is extremely convenient, and a safety hazard is eliminated.