134 results about "Magnetic field coupling" patented technology

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.

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 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 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).

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.

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.

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 relates to the technical field of solid fuel engines, in particular to an electric field and magnetic field coupling regulation solid propellant combustion device which comprises a bottom plate, a left base and a right base are fixedly mounted on the bottom plate, a combustion chamber is fixed to the left base and the right base, a top cover is arranged at the right end of the combustion chamber, and a Laval nozzle is fixedly connected to the left end of the combustion chamber. The combustion chamber is filled with a solid propellant and a combustion surface monitoring device and is used for tracking the combustion surface of the solid propellant, a displaceable physical field applying device is arranged on the outer side of the combustion chamber and is used for applying various physical fields to the combustion surface, and a driving assembly is mounted on the bottom plate; the monitoring control device is used for collecting data, calculating the position and the speed of a combustion surface in the combustion chamber and controlling the driving assembly to pull the physical field applying device to move, and excitation of coupling of an electric field and a magnetic field can be applied to the solid propellant so as to research the influence on combustion of the solid propellant under the coupling action of the electric field and the magnetic field.

A terminal connector and an electric drive assembly, includes a terminal block and magnetic conductors arranged on a mounting part. The terminal block has a plurality of connecting terminals for transmitting three-phase electricity, and first connecting ends and second connecting ends of the connecting terminals extend out of the mounting part, so as to be electrically connected to a motor controller and a drive motor respectively. Therefore, the connecting terminals pass through a first coupling space of the magnetic conductor, so that an induced magnetic field generated by the connecting terminals is coupled to the magnetic conductor. At the same time, a second coupling space is arranged on an outer side of the mounting part, so that when the terminal connector is connected to the motor controller, the induction element may be arranged on an inner side of the second coupling space.

This invention discloses a multi-frequency magnetic field coupled single-channel absolute time-grid angular displacement sensor, comprising a stator and a rotor. The stator includes a stator base, a coupling receiving unit, a first isolation ring, and an excitation unit. The rotor includes a rotor base, a coupling transmitting unit, a second isolation ring, and a sensing unit. The excitation unit includes a roughing excitation unit and a precision excitation unit, and the sensing unit includes a roughing excitation unit and a precision sensing unit. The roughing excitation unit and the precision excitation unit are located on the same code channel, and the roughing sensing unit and the precision sensing unit are located on the same code channel. The axial distance between the roughing excitation unit and the precision sensing unit is equal to the axial distance between the precision sensing unit and the precision excitation unit. During operation, the rotor rotates relative to the stator. Excitation signals of different frequencies are input to the roughing and precision excitation units, and the coupling receiving unit outputs the sensing signal. The absolute angular displacement value is obtained by calculating the signal. This invention can reduce the sensor size while reducing cumulative error.

And high-frequency noise is reduced. A semiconductor module (100) is provided with a semiconductor element (1), a power supply path (3), a first inductor (L1), a capacitor (C1), and a second inductor (L2). The semiconductor element (1) has a power supply terminal (14). The power supply path (3) is connected to a power supply terminal (14) of the semiconductor element (1). The first inductor (L1) is provided in the power supply path (3). The capacitor (C1) has a first end and a second end. In the capacitor (C1), a first end is connected to the power supply path (3), and a second end is connected to ground. The second inductor (L2) is provided in the power supply path (3) and is connected between the first inductor (L1) and the power supply terminal (14). The first inductor (L1) and the second inductor (L2) are configured to couple a magnetic field generated by the first inductor (L1) with a magnetic field generated by the second inductor (L2).

The application discloses a terahertz ultra-wideband single-pole single-throw high-speed switch, and relates to a waveguide transmission line technology. The scheme is proposed for the high insertion loss and other problems in the prior art. A coupling line module is arranged for coupling connection between a signal input end and a signal output end; a switch module is arranged for turning on or turning off the coupling line module; the coupling line module is provided with a folded coupling line structure and a folded pseudo virtual line structure; the folded coupling line structure is used for signal coupling transmission; the folded pseudo virtual line structure is symmetrically arranged with the folded coupling line structure and is used for assisting electromagnetic coupling to improve the working frequency of the switch. The pseudo virtual line technology introduced can additionally participate in electromagnetic field coupling and change pole distribution and frequency response of a circuit, so that the working frequency of the circuit is improved. In addition, the structure itself has the characteristics of low insertion loss, and a control transistor gate does not need to be additionally applied with a large bias resistor, so that the switching speed of the switch is significantly improved.

The utility model relates to motor technical field especially relates to a kind of excitation type series excitation linear motor, including shell and its inside stator coil and motional coil and the drive shaft axially slidingly connected in shell. Limiting piece that shell is equipped with limit the circumferential movement of drive shaft, the first end of drive shaft is connected with motional coil by penetrating into shell interior, and the second end of drive shaft penetrates out shell exterior. Stator coil is set in the outside of motional coil, and there is air gap between the two, and the series excitation mode connection between the two, the excitation magnetic field coupling between stator coil and motional coil makes motional coil drive shaft linear motion, compared with the existing permanent magnet linear motor, no longer rely on permanent magnet to form magnetic field, effectively reduce the manufacturing cost of motor, avoid the assembly and failure problem related with permanent magnet, and with high thrust density, application range is wider, especially can be applied to the field such as needleless injection and electromagnetic riveting of higher thrust intensity requirement.

The invention discloses a dual-load automatic guided vehicle wireless charging system with an anti-offset characteristic, and belongs to the technical field of wireless power transmission. The system comprises a high-frequency full-bridge inverter, an LCC-S resonance compensation network, an orthogonal DD coil, a full-bridge rectifier and an external element. A transmitting coil and a receiving coil respectively adopt a winding method with dense outside and sparse inside and a winding method with sparse outside and dense inside, orthogonal magnetic field coupling is enhanced in combination with a ferrite magnetic core, and efficient cooperative power supply of a single power supply to double receiving loads and system stability are effectively guaranteed. The LCC-S network realizes bilateral resonance and zero phase angle input of the system through configuration of a plurality of independent capacitors and inductors, provides constant voltage output and inhibits multi-load crosstalk. Compared with the prior art, the problems of weak anti-offset capability, large multi-load interference, sudden efficiency drop and the like of a traditional scheme are effectively solved, and the coupling coefficient gt is within the offset range of + / -20cm; 0.25, the transmission efficiency is stable gt; double-AGV parallel charging is supported, and the voltage fluctuation is lt when a single load exits; and the system stability and the multi-machine cooperation capability are improved.

The utility model discloses an optimized structure of a high-power motor. The optimized structure is composed of a motor main body, a central output shaft and a rotor assembly. The output shaft is made of high-strength steel and connected with a rotor formed by laminating silicon steel sheets. The rotor is of a multi-layer coaxial bearing supporting structure, the inner diameter and the outer diameter of a bearing are designed in a differentiated mode, high-hardness bearing steel materials are selected, radial friction loss is reduced through optimized diameter difference layout, and the torque of an output shaft is remarkably improved. The outer layer of the rotor is circumferentially and fixedly provided with a rectangular-section copper electric coil, the outer side of the rotor is embedded with an annular permanent magnet, the magnetic field coupling efficiency is enhanced through layered electromagnetic assembly layout, and high power density is realized. According to the design, hierarchical bearing supporting is integrated, and comprehensive improvement is formed in the aspects of mechanical transmission efficiency, magnetic field energy utilization and power transmission reliability.

The application discloses a multi-cell digital light processing printer and method of light field-magnetic field coupling regulation. The application couples a magnetic field generating device with a light curing device, uses a magnetic field to control and replace microspheres with different cells and different magnetic contents in a tank, so that the replacement process is parallel to the printing process, and the printing efficiency is improved; meanwhile, the single-tank non-contact replacement is used, cross contamination is reduced, and multi-cell biological structures can be manufactured with high precision, high efficiency and high cell activity.

This invention discloses an integrated electromagnetic ultrasonic monitoring device, which integrates transducer components and hardware circuitry within a compact, enclosed housing. A multi-layered shielding structure achieves directional magnetic circuit constraint and magnetic flux leakage suppression. Simultaneously, this invention constructs a gradient thermal resistance architecture to passively block external heat flow. A thermal insulation medium is arranged between the magnetic shield and the base plate of the housing, cutting off the heat conduction shortcut formed by the high permeability material, thus decoupling and coordinating electromagnetic shielding and thermal protection functions within a limited space. This invention features a compact, integrated design and is suitable for online health monitoring of equipment under high-temperature, strong magnetic field coupling conditions.

The application provides an underground magnetic induction voice communication system based on a Zynq architecture, belongs to the underground magnetic induction communication field, and constructs a complete software and hardware cooperative processing platform, which comprises a Zynq chip, a voice module, a radio frequency module and an automatic alignment module; the application makes full use of the advantages of the heterogeneous platform of the Zynq chip, and efficiently executes the complex system control and signal processing tasks on the PS end and the PL end respectively; at the same time, the radio frequency module adopts a direct sampling architecture, which not only effectively improves the data processing efficiency, but also makes the system highly integrated to meet the requirements of portable devices; on the basis, the automatic alignment module can automatically ensure that the coil always keeps in the best magnetic field coupling in the working process of the system, and improves the reliability of the communication link. Based on this, the application realizes a magnetic induction voice communication system which is specially designed for the underground complex environment, and has high reliability, high integration and high convenience.

The present invention provides a current sensor spaced apart from a power line, the current sensor being configured to measure a current of a power transmission conductor provided in a power line for transmitting power. The current sensor comprises: a substrate including multiple conductor layers; and a sensor unit including a sensing coil in which multiple upper patterns and lower patterns respectively formed on a pair of conductor layers selected from among the multiple conductor layers are formed in a coil shape, the sensing coil being magnetically coupled to a magnetic flux by a current of the power line to output an induced sensing signal, wherein the sensor unit is disposed on one side of the power line so that a central axis of the sensing coil intersects a current direction of the power line, and the lower pattern of the sensing coil is disposed to be spaced apart from a surface of the power transmission conductor by a predetermined distance or more.

This invention provides a wireless charging system based on focus state estimation and dynamic fusion compensation, relating to the field of wireless charging technology. The system consists of two main parts: a ground power supply unit and an on-board charging unit. The two are connected and work collaboratively via a bidirectional wireless communication link and a wireless energy transmission channel based on magnetic field coupling. The ground power supply unit receives DC power input from a DC bus converted from AC mains power and transmits energy to the on-board charging unit via magnetic field coupling; simultaneously, it receives communication signals from the on-board charging unit. The on-board charging unit receives energy from the ground power supply unit via magnetic field coupling, converts it into electrical energy, and supplies power to the vehicle's electrical load. Simultaneously, an observer-based control method is employed to estimate and dynamically compensate for the total disturbance to stabilize the output voltage of the system in real time and transmit control commands to the ground power supply unit.