235 results about "Magnetic field coupling" patented technology

The invention relates to the field of servo motor parameter optimization, in particular to a magnetic field simulation and parameter optimization method and system for a permanent magnet servo motor rotor. The method comprises the following steps: acquiring a rotor global magnetic field monitoring curve in the operation process of a servo motor rotor, and constructing a global magnetic field accurate compensation model; performing regional magnetic circuit structure analysis on the global magnetic field accurate compensation model, performing dynamic magnetic field logic mapping modeling, and constructing a real-time regional magnetic field logic map; performing magnetic field state change analysis on the global magnetic field accurate compensation model, performing multi-node change track correlation analysis, and constructing a multi-node magnetic field coupling dependency network; and performing short-term magnetic field evolution prediction based on the multi-node magnetic field coupling dependency network, and performing comprehensive electromagnetic performance evaluation to obtain an electromagnetic performance evaluation report. According to the method, the sudden change of the magnetic field is accurately and quickly identified, so that the magnetic field parameters are iteratively adjusted and optimized, and the service life and the performance of the servo motor are improved.

The invention relates to the technical field of air purification, and discloses a negative oxygen ion generator and a method thereof.The negative oxygen ion generator comprises an external shell used for providing installation positions for related parts; the power supply input module is mounted in the external shell, is internally provided with a filtering unit, and is used for receiving external direct current; the direct current and alternating current inversion module is electrically connected with the output end of the power supply input module, is internally provided with a switch assembly and is used for converting the direct current into high-frequency alternating current; a primary winding, a secondary winding and a feedback winding are arranged in the boosting transformer. A boosting transformer is arranged between a direct current and alternating current inversion module and a high-voltage double-voltage rectification module, so that the voltage is effectively boosted, more importantly, the magnetic field coupling characteristics of a primary winding and a secondary winding are utilized, reliable electrical isolation is constructed, and a physical path from a high-voltage side circuit to a low-voltage side circuit is blocked.

The invention relates to a physical field coupling simulation analysis method and device of a circuit breaker, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring distributed conductivity in an arc extinguish chamber of the circuit breaker; according to the distributed conductivity and an electric field finite element equation, an electric field distribution value in the circuit breaker arc extinguish chamber is obtained through calculation; calculating a current density distribution value in the arc extinguish chamber of the circuit breaker based on the electric field distribution value; substituting the current density distribution value into an axisymmetric magnetic field equation, and performing electric field and magnetic field coupling; substituting the port boundary voltage and the port current of the arcing area of the circuit breaker into the circuit matrix equation, and carrying out electric field and circuit bidirectional coupling; the electric field finite element equation, the axial symmetry magnetic field equation and the circuit matrix equation are combined, and the potential distribution value and the magnetic field distribution value of the arcing area of the circuit breaker and the port boundary voltage and the port current of the equivalent resistor are obtained through solving. By adopting the method, the simulation analysis efficiency and precision of the circuit breaker arc extinguish chamber can be improved.

The invention belongs to the technical field of integrated die casting, and relates to an integrated die casting forming method and system based on multi-magnetic-field coupling. The method comprises the steps that S1, metal raw materials are subjected to smelting, degassing modification and deslagging standing, and a metal melt is obtained; s2, in the inert gas environment, electromagnetic stirring is conducted on the metal melt; s3, the mold is subjected to mold heating, heat preservation and pressure maintaining, vacuumizing and release agent spraying; s4, the metal melt is pressed into a mold cavity for mold filling and solidification, a coupling magnetic field is applied to the metal melt, and an integrated die casting is obtained; wherein the coupling magnetic field covers a mold cavity and is used for improving the flowability of a metal melt during mold filling, inhibiting turbulent flow and refining the structure of the metal melt after solidification; the coupling magnetic field comprises a direct-current magnetic field and a pulsed magnetic field, the direct-current magnetic field penetrates through the metal melt from bottom to top, and the pulsed magnetic field penetrates through the metal melt from the side of the mold cavity. By means of the method, the high-quality integrated die casting can be manufactured.

The invention relates to the technical field of magnetic material injection molding, and discloses an injection molding magnetic powder orientation optimization method and system based on rheology-magnetic field coupling. The method comprises the following steps: deploying a distributed sensing network at key positions of a mold runner and a mold cavity, and synchronously capturing dynamic viscosity change gradient and magnetic field intensity space distribution of a melt in real time in a filling process. The captured data are input into a multi-physics field coupling simulation engine based on micromechanics, an instantaneous orientation vector field of the magnetic powder in the cavity is obtained through calculation, then an orientation order degree topological graph is constructed through tensor analysis and an image algorithm, and a weak orientation area and the boundary of the weak orientation area are accurately recognized. And finally generating a composite regulation and control instruction of the magnetic field and the injection parameters according to an identification result. According to the method, online diagnosis and active compensation regulation and control of the orientation state of the magnetic powder can be realized, and the orientation uniformity and consistency of the injection molding magnet are improved.

The invention relates to the technical field of medical instruments, in particular to an electromagnetic needleless injector which comprises a shell, a nozzle assembly, a liquid storage assembly, a driving assembly and an intelligent control system. Firstly, a series excitation linear motor is adopted to replace a traditional needleless injector driven by a spring, and the problems that driving force is limited and elasticity is attenuated due to the spring are effectively solved. According to the series excitation linear motor, through excitation magnetic field coupling between the stator coil and the rotor coil in the motor, the rotor directly drives the plunger rod to do linear motion in the axial direction so as to complete injection, the structure is simpler, the direct drive type connection structure is adopted, the stability is higher, and force transmission is more accurate. In addition, an intelligent control system integrated in the needleless injector enables the needleless injector to be more intelligent, control precision is higher, operation is more convenient, the needleless injector can be wirelessly connected with a breeding cloud management system, rapid, accurate and painless injection of live pigs and other animals can be achieved, and breeding efficiency and injection safety are improved.

A three-phase wireless electric energy transmission device disclosed by the present invention comprises a three-phase inverter, a three-phase switch capacitor, a coil magnetic field coupling structure and a rectifier, the coil magnetic field coupling structure comprises a primary coil and a secondary coil which are arranged in mirror symmetry, the primary coil is provided with two layers, each layer comprises a three-phase coil, each phase coil occupies a 120-degree angle range of the circumference, and the rectifier is connected with the primary coil and the secondary coil. The two layers of coils form a staggered angle, each phase of switched capacitor of the three-phase switched capacitor comprises a first capacitor branch and a second capacitor branch which are arranged in parallel, the first capacitor branch is provided with a first capacitor, and the second capacitor branch comprises a second capacitor and a switch module which are arranged in series; the switch module adjusts the equivalent capacitance value of the second capacitor branch through the duty ratio and adjusts the transmission power of the three-phase wireless power transmission device. The invention further discloses a load power adjusting method of the three-phase wireless power transmission device, the transmission efficiency can be kept unchanged within the adjusting range, and soft switching can be achieved within the adjusting range.

The invention discloses equipment and a method for laser auxiliary heating, magnetic control arc combination and static magnetic field coupling, and relates to the technical field of refractory and high-melting-point metal and metal-based composite materials. The problems of difficulty in melting and non-uniform components in the prior art are solved. The equipment comprises a vacuum melting furnace, a split water-cooled crucible, a laser auxiliary heating device, an electric arc generating device, a magnetic control device, a static magnetic field generating device and a central control cabinet. The method comprises the steps of charging and vacuumizing, laser preheating, starting arc and double-magnetic-field coupling smelting, and coordinately regulating and controlling multiple parameters through a control cabinet so as to realize accurate control on flowing and solidification structures of a molten pool. Through multi-energy field time sequence coupling and space cooperation of laser, magnetic control electric arc and static magnetic field, active intervention on the molten pool dynamics and solidification process is achieved, component homogenization is promoted, the solidification structure is refined, and the method is used for preparing high-temperature alloy and refractory and active metal material cast ingots with uniform components and excellent structure performance.

This invention provides an axial-radial composite flux permanent magnet motor, relating to the field of motor technology. It includes a rotor assembly and a stator assembly. The rotor assembly includes multiple permanent magnets uniformly arranged circumferentially. Each permanent magnet includes an integrally formed axial pole segment, a first transition segment, and a radial pole segment. The stator assembly includes a stator core and stator windings. The stator core includes stator teeth uniformly arranged circumferentially. Each stator tooth includes an integrally formed axial tooth body segment, a second transition segment, and a radial tooth body segment, corresponding to the axial pole segment, the first transition segment, and the radial pole segment, respectively. The stator windings are wound on the corresponding axial tooth body segments. This invention not only reduces magnetic energy loss and improves magnetic field coupling efficiency but also increases the effective coupling area between the permanent magnets and the stator teeth, improving the motor's torque density and power density. Furthermore, it ensures stable operation and has a wide range of applications.

The invention discloses a flat wire type high-power E-type non-contact power supply electricity taking device which comprises an E-type magnetic core and a coil assembly wound on the E-type magnetic core, the coil assembly is formed by winding a flat wire in a multi-layer lap winding mode, no framework structure exists in the coil assembly, the wire in the coil assembly is the flat wire, and the E-type magnetic core is arranged on the E-type magnetic core. The flat wire is a flat copper bar, and the cross section of the flat wire is rectangular. The flat wire type high-power E-type non-contact power supply electricity taking device is formed by winding flat wires in a multi-layer lap winding mode, every two adjacent layers of flat wires are arranged in a staggered mode, the interlayer gap is controlled to be within 0.1 mm, and the groove fullness rate reaches 92% or above. The design not only improves the effective sectional area of the conductor, but also significantly reduces the eddy current loss, thereby improving the magnetic field coupling efficiency.

The application relates to a double-side coupling axial nutational magnetic speed reducer and a working method thereof. The speed reducer comprises a box, an input shaft is arranged at the left end of the box, a rotating disc is arranged at the right side in the box, a nutational disc is arranged in the box and rotates with the input shaft, first and second nutational magnetic gears are arranged at the left and right end faces of the nutational disc respectively, a fixed magnetic gear is arranged at the left end of the box and is magnetically coupled with the first nutational magnetic gear, and a movable magnetic gear is arranged at the left end face of the rotating disc and is magnetically coupled with the second nutational magnetic gear. The double-side coupling axial nutational magnetic speed reducer can realize few-pole difference, has simple structure, large transmission ratio and high transmission efficiency, the axial forces generated by the axial magnetic gears on the two sides can be effectively offset, the service life of bearings is prolonged, the axial force is small, and transmission is stable.

The invention discloses a magnetic coupling surge protection device based on an amorphous ferrite material, which comprises an amorphous ferrite magnetic core, a secondary side inductor, a secondary side resistor, a bias conductor and a bias power supply, is nested outside a high-voltage direct-current transmission line, and forms magnetic field coupling with the high-voltage direct-current transmission line through the amorphous ferrite magnetic core in the device. When suddenly changed surge current flows through the device, a rapidly changing magnetic field is excited in the amorphous ferrite material, the magnetic field provides equivalent inductance for the high-voltage direct-current transmission line, and meanwhile, the rapidly changing magnetic field generates induced electromotive force in the bias conductor and generates induced current; the induced current generates heat loss in the process of flowing through the secondary side resistor, and surge current energy in the high-voltage direct-current transmission line is converted into the heat loss of the secondary side resistor through the process, so that surge protection is realized. The invention has the advantages of high saturation magnetic flux density, high relative permeability, excellent high-frequency performance and the like, and is suitable for the operation condition of magnetic coupling surge protection equipment.

This invention discloses a magnetically levitated grain vibrating screen, belonging to the field of grain impurity removal technology. It includes a base with a magnetic coupling module; a screen body mounted above the base, with a permanent magnet array corresponding to the magnetic coupling module at its bottom; the magnetic coupling module includes a drive assembly mounted on the base, comprising multiple independent drive coils, each connected to an independently adjustable AC power supply; the AC power supply generates a changing driving magnetic field by inputting AC current of a preset frequency and phase to the corresponding drive coil, and the driving magnetic field couples with the permanent magnet array, driving the screen body to perform multi-degree-of-freedom force-driven motion. The screen body of this invention can perform multi-degree-of-freedom force-driven motion, realizing reciprocating swing motion, and improving the screening efficiency for fine impurities in grain.

The invention relates to the technical field of motors, in particular to an excitation type series excitation linear motor and a control method, the excitation type series excitation linear motor comprises a shell, a stator coil and a rotor coil, the stator coil and the rotor coil are arranged in the shell, one end of the shell is axially and slidably connected with a driving shaft, and a control module used for adjusting the magnitude and direction of thrust is arranged outside the shell. One end of the driving shaft penetrates into the shell and is connected with the rotor coil, and the other end penetrates out of the shell. The stator coil is sleeved outside the rotor coil, an air gap exists between the stator coil and the rotor coil, the stator coil and the rotor coil are connected in a series excitation mode, and the driving shaft is enabled to perform linear motion through excitation magnetic field coupling between the stator coil and the rotor coil. Compared with an existing linear motor, the linear motor does not depend on a permanent magnet to form a magnetic field any more, the manufacturing cost of the motor is effectively reduced, the problems of assembly and failure related to the permanent magnet are solved, and the linear motor has high thrust density and wider application range and can be particularly applied to the fields of needleless injection, electromagnetic riveting and the like with high thrust strength requirements.

The utility model relates to the technical field of building blocks teaching aid, especially to a circuit module and circuit toy set, including base, the side of base is provided with the interface for inserting the power cord, the bottom of base is provided with the standardization intermate structure for inserting on building block board, and the standardization intermate structure is connecting post or connecting groove, the inside rotation of base is provided with magnetic attraction component and the driving device of driving magnetic attraction component rotation, at least partly transparent liquid storage cylinder body, detachably installed on the base, the bottom of liquid storage cylinder body is equipped with magnetic rotation component, wherein, when liquid storage cylinder body installs to base, magnetic rotation component is located in the magnetic field action range of magnetic attraction component, when driving device drives magnetic attraction component rotation, through magnetic field coupling drives magnetic rotation component synchronous rotation, makes the liquid in liquid storage cylinder body form whirlpool, this scheme has the advantages of non -contact transmission to avoid mechanical wear and tear, high modular degree and convenient maintenance.

An aerosol-generating device (100) and a state detection method for a substrate tape (123). The aerosol-generating device (100) consists of a main unit housing (111), a medium cartridge (120), a driving assembly (11), a heating assembly and a control circuit (12), wherein a first reel (124), a second reel (125) and a substrate tape (123) which is connected to and wound around the two reels are provided inside the medium cartridge (120); and the substrate tape (123) is provided with first magnetic induction segments (21) and second magnetic induction segments (22), which are alternately spaced. When the first reel (124) and the second reel (125) are driven to rotate, a magnetic induction coil assembly (13) of the heating assembly generates a magnetic field that couples with magnetic fields generated by the first magnetic induction segments (21) and the second magnetic induction segments (22), and generates electrical signals of different magnitudes; and the control circuit (12) samples the electrical signals, determines the motion state of the substrate tape (123) on the basis of the electrical signals, and determines whether the problem of tape breakage or tape jamming occurs; thus, corresponding drive control can be performed on the driving assembly (11) and / or corresponding alarm prompt information can be sent out, thereby realizing state detection of the substrate tape (123), and improving the safety of the aerosol-generating device (100).

To allow the amplitude of a received signal to be increased.SOLUTION: A communication device is a communication device that performs wireless communication, and includes a first dielectric 152 and a second coupler provided on the first dielectric and coupled with a first coupler of another communication device by electric field coupling or magnetic field coupling. The second coupler has a first conductor 121a and a second conductor 121b. The first dielectric is provided with a hole 153, a recess, or a second dielectric having specific permittivity lower than that of the first dielectric, in at least part of an area projected onto an area between the first conductor and the second conductor.SELECTED DRAWING: Figure 5

The invention discloses a reciprocating driving mechanism and a fascia gun, and relates to the technical field of transmission mechanisms. The reciprocating driving mechanism comprises a coil assembly and a moving assembly. The coil assembly comprises a coil support and a coil, and the coil support is sleeved with the coil. The coil support is used for being connected with the supporting base. The moving assembly comprises a guide part, an output assembly and a magnetic part; the guiding piece is used for being connected with the supporting base. The output assembly is slidably connected to the guiding piece in the first direction. The magnetic member is connected to the output assembly and is arranged opposite to the coil. The magnetic piece can drive the output assembly to move in a reciprocating mode in the first direction under the condition that the coil is powered on. The reciprocating driving mechanism directly drives the output assembly to do reciprocating motion through magnetic field coupling of the coil and the magnetic piece, an intermediate transmission part in a traditional scheme is omitted, and the advantages of being simple in structure, low in manufacturing cost and silent and stable in operation are achieved.

The application discloses an underwater magnetic field coupling magnetostrictive backfill type friction spot welding device, which comprises a stirring needle, a compression ring, welding material, a compression ring chuck, a top end clamp, a top rod, a cap, an electromagnetic transducer, a magnetic conducting ring, a fixed connecting rod and a water tank; the top end clamp is fixed on the compression ring chuck and cooperates with the internal top rod to fix the welding material at the bottom end of the electric spindle; the fixed connecting rod is sequentially sleeved with the electromagnetic transducer and the cap, and the three are concentrically matched and located at the bottom of the welding point center; the magnetic field energy is converted into electric energy and mechanical energy to the welding point through the electromagnetic transducer. The stirring needle is opposite to the surface of the welding material; the welding material is submerged in the pool of the water tank, and the pool water flow in the water tank is adjusted according to the temperature change; the electronic converter is added at the bottom to improve the temperature distribution of the welding point and the material flow; the underwater welding reduces the heat input and the heat affected zone structure area, and ensures the effective implementation of electromagnetic induction.

The utility model discloses a high-torque-density magnetic transmission speed reducer and a built-in motor of a power-assisted bicycle, and belongs to the power-assisted technology of bicycles. A magnetic transmission speed reducer and a motor in the prior art have the defects of large torque fluctuation, low transmission efficiency, easy magnetic field mismatch, uncontrollable eddy current loss and the like, the magnetic transmission speed reducer comprises a first stator, a first rotor and a modulation ring, the modulation ring is located between the first rotor and the first stator, a first air gap is kept between the modulation ring and the first stator, and a second air gap is kept between the modulation ring and the second stator. A second air gap is kept between the modulation ring and the first rotor, the modulation ring comprises modulation teeth, the total number of the modulation teeth is p2, the number of pole pairs of the first stator magnetic ring is p3, the number of pole pairs of the first rotor magnetic ring is p1, p1 = p2-p3, a magnetic field of the first air gap is coupled with a magnetic field of the second air gap, and rotation from the first rotor is output in a speed reduction mode through the modulation ring. The motor part and the reduction gear realize transmission through magnetic force, thereby improving the motor operation efficiency and reducing the overall noise of the motor.

The invention discloses a motor angle magnetic field fixed position output method, which relates to the technical field of automotive electronics, and comprises the steps of outputting a PWM signal to control the operation of a motor, collecting a magnetic field signal, a temperature signal and a load torque signal, calculating a magnetic field coupling correction coefficient, a dynamic weight and a comprehensive positioning error, and adjusting the PWM signal through closed-loop feedback to realize accurate positioning. According to the method, the problem of positioning errors caused by neglecting magnetic field nonlinearity, temperature drift and load torque coupling influence in the prior art is solved, and the positioning precision and operation stability of the motor under complex working conditions are improved.

This disclosure provides systems, methods, and apparatus that enable a power transmitter of a wireless power system to determine a coupling coefficient k (k factor). The k factor represents an amount of magnetic field coupling between a primary coil of the power transmitter and a secondary coil of a power receiver. The k factor affects the effectiveness of power transfer at various operating frequencies. In some aspects, a power transmitter may determine the k-factor prior to power negotiation, such that the power transmitter may negotiate a negotiated power level limit based in part on a potential operating frequency and a consideration of the k-factor. In some aspects, a k-factor measurement protocol enables the power transmitters and the power transmitters to coordinate k-factor evaluation before or during a power supply state.

A method includes receiving, from a sensor proximate a first conductor, a sensor signal representing a measurement of a magnetic field produced by a first current flowing in the first conductor and a second current flowing in a second conductor. The first current includes first and second current components having different frequencies, and the second current includes third and fourth current components. The third current component is phase shifted from, and has the same frequency as the first current component. The fourth current component has a different frequency from the third current component. The method also includes determining reference values of the first and second currents, and, based on the sensor signal and the reference values of the first and second currents, determining for the sensor, a plurality of coupling coefficients representing magnetic field coupling between the first and second conductors.

An aerosol product (10) and an aerosol generation apparatus (100). The aerosol product (10) comprises an aerosol generation member (1) and a blocking member (2) that are adjacently arranged, wherein the aerosol generation member (1) comprises an aerosol generation substrate (11) and a susceptor (12), and the susceptor (12) can generate heat energy in a magnetic field so as to heat the aerosol generation substrate (11); and the blocking member (2) comprises a carrier (21) and magnetic particles (22) dispersed in the carrier (21). The magnetic particles (22) can be effectively magnetized in a magnetic field, thereby becoming an additional magnetic source, and magnetic field coupling can occur between a magnetic field generated by the magnetic particles (22) and a magnetic field generated by an induction coil (20), such that the magnetic field strength of a magnetic field generated by the aerosol generation apparatus (100) is enhanced; and when the susceptor (12) has a machining error, an assembly error, etc., the susceptor (12) can still generate a preset magnetic strength in the magnetic field having the enhanced magnetic field strength, thereby improving the probability of the aerosol product (10) passing an identification operation.

This invention provides a rotary coupling mechanism for wireless power supply of satellite SADA (Supervisory Automation) systems, comprising a power transmitter and a power receiver. The power transmitter includes a power transmitting circuit and a transmitting coil, while the power receiver includes a power receiving circuit and a receiving coil. The power transmitting circuit is connected to a solar panel, and the power receiving circuit is connected to satellite electrical equipment. The transmitting coil is wound on the outer wall of the inner cylinder, and the receiving coil is wound on the inner wall of the outer cylinder. Both the outer and inner cylinders are made of metal. A signal transmitting circuit is connected to the outer cylinder, and a signal receiving circuit is connected to the inner cylinder. When the inner and outer cylinders are nested, the transmitting and receiving coils face each other, forming a magnetic field coupling to achieve wireless power transmission. Parts of the inner and outer cylinder walls face each other, forming an electric field coupling to achieve wireless signal transmission. Its advantages are: it meets the requirements for energy and signal transmission, has a simple structure, is easy to install, and effectively avoids many problems caused by friction and wear in slip ring structures.

This invention discloses a method, system, device, and medium for synchronous measurement of multi-conductor current based on a sensor array. The method includes: presetting a sensor array and performing a calibration mechanism on the sensor array; using the calibrated sensor array to perform a first positioning of a cable; constructing a data acquisition channel using the sensor array after the first positioning; performing phase calibration on the data acquisition channel until the phase difference between each data acquisition channel meets a preset requirement; acquiring magnetic field information data of multiple conductors through the phase-calibrated data acquisition channel; performing a first calculation on the magnetic field information data to obtain synchronous magnetic field data; and eliminating phase deviations between data acquisition channels by calibrating the sensor array, performing the first positioning, constructing the data acquisition channel, and performing phase calibration, thereby improving the measurement accuracy of the phase angle of the multi-conductor current, reducing installation errors, establishing and solving a multi-conductor magnetic field coupling model, and synchronously obtaining the current amplitude and phase information of each conductor.

The utility model discloses a kind of blending kettle with intelligent sight hole lamp, it is related to the technical field of blending kettle, the utility model includes the top of shell is equipped with several sight glasses, the upper end of sight glass is equipped with sight hole lamp, the upper end of shell is also provided with manhole, the edge portion of manhole is hinged with manhole cover by hinge structure;Magnetic control sensor is integrated in the circumferential edge portion of manhole, and permanent magnet assembly is embedded in the coaxial corresponding position of manhole cover inner side, touch sensor is integrated in the installation base adjacent area of sight hole lamp, the output signal end of magnetic control sensor and touch sensor is respectively accessed microcontroller, microcontroller controls the power supply loop on-off of sight hole lamp by relay drive circuit.The application is coupled with the magnetic field of magnetic control sensor and permanent magnet to realize accurate linkage with opening action, without manual intervention.Touch sensor adjacent to sight hole lamp provides intuitive operation, responds quickly, and it is convenient, low in cost, avoid the security risk of line aging or damage.

This invention discloses a piezoelectric sensing adaptive internal pressure fixation bone plate system for treating tibial plateau fractures, belonging to the field of orthopedic implantable medical devices. It includes a bone plate, pressure bolts, and an external control module. The bone plate is available in three specifications according to the Schatzker classification: lateral L-type, medial T-type, and bilateral composite type, with transverse internal pressure holes. The pressure bolts embed a PZT-5H piezoelectric sensing device and have an overload-resistant groove between the head and neck, enabling real-time acquisition of the compressive stress at the bolt-bone interface. The external control module transmits signals wirelessly via Bluetooth 5.0 and uses a PID algorithm to non-contactly drive the bolts via magnetic field coupling to adaptively adjust the compressive stress to 30–50 MPa. The system has two levels of safety protection: 55 MPa coil power-off protection and 80 MPa groove breakage protection. This system eliminates the need for secondary surgery, dynamically maintains optimal stress throughout the fracture healing cycle, with a healing time ≤12.5 weeks, a complication rate ≤4%, and an excellent / good knee HSS score rate ≥88%. It is suitable for Schatzker type I-VI tibial plateau fractures.

The invention discloses a transfer coefficient adaptive updating method, system and device and a medium, and relates to the technical field of non-contact current sensing, and the method comprises the steps: measuring a magnetic field of an arrangement point location; initializing the position drift distance of the measured line, estimating a transfer coefficient matrix, and estimating the measured current in combination with the transfer coefficient matrix and the actually measured magnetic field; in combination with the estimated transfer coefficient matrix and the measured current, decoupling the actually measured magnetic field to a magnetic field component independently generated by each measured current; and based on the decoupled magnetic field component and the estimated measured current, re-estimating the position drift distance of the measured circuit, and iteratively correcting the transfer coefficient matrix until convergence. According to the method, the transfer coefficient matrix is updated through real-time iteration, so that the measurement precision in a dynamic environment is improved; through a magnetic field component decoupling model, the problem of multi-conductor magnetic field coupling interference is effectively solved, and the accuracy of position estimation is improved; and a closed-loop iterative optimization strategy is adopted to ensure that the algorithm is stably converged to a true value.

The invention relates to a method for synthesizing calcium hexaboride micro-nano powder by electric field and magnetic field coupling auxiliary combustion, which mainly comprises the following steps: by taking calcium hydroxide, boric oxide and magnesium powder as raw materials, carrying out electric field and magnetic field coupling auxiliary combustion synthesis to obtain a reaction product; and then, carrying out acid pickling on a reaction product to obtain the unique calcium hexaboride micro-nano material with the hollow cubic structure. In the process of combustion synthesis of calcium hexaboride, under the coupling influence of an electric field and a magnetic field, the prepared calcium hexaboride micro-nano powder shows unique hollow cubic structural characteristics, and the structural characteristics enable the calcium hexaboride micro-nano powder to have the advantages of high specific surface area, light weight, porous neutron absorption and the like; the method has important application prospects in the fields of aerospace, high-end manufacturing, nuclear industry and the like.