94 results about "Eddy current effect" patented technology

The invention relates to the technical field of electromechanical hydraulic systems, and particularly discloses a low-temperature cold start control method based on high-frequency injection, which comprises the following steps: analyzing a motor state, and carrying out observation and feed-forward compensation on disturbance caused by the motor state to a load torque and a viscosity coefficient through a sliding mode observer algorithm; according to the motor state, obtaining a state equation, constructing an extended sliding mode observer equation, deriving to obtain an observer error equation, and observing the load torque; analyzing the obtained load torque, wherein the motor load torque reflects the oil viscosity; high-frequency current injection, injection frequency control, skin effect enhancement and current amplitude control are carried out in a low-temperature state according to an oil viscosity result, copper loss and a high-frequency magnetic field eddy current effect are used for assisting heat generation, and according to a final oil viscosity result, when electromagnetic heat generation viscosity is reduced and a load is reduced, an injection voltage amplitude is gradually reduced. And after a normal starting condition is reached, switching to normal id = 0 control.

The invention relates to the technical field of electromagnetic measurement, and discloses a measurement unit stabilization method and system, electronic equipment and a storage medium, and the method comprises the steps: obtaining three-dimensional displacement trajectory data in real time, and building a motion error compensation model containing a mechanical vibration direction vector and a phase offset; on the basis of asymmetric magnetic pole distribution, combined with phase difference calculation of a magnetic circuit gradient direction vector and a mechanical vibration direction vector, a closed loop current orthogonal to the mechanical vibration direction vector is generated on an interface to realize gradient isolation; based on a multi-branch common-mode suppression mechanism, an interference signal reaches a preset attenuation amplitude before a loop is closed through combination of a magnetic core impedance matching characteristic and an eddy current effect; and performing dynamic matching based on the displacement parameter and an electromagnetic interference attenuation result, adjusting a magnetic pole inclination angle in real time, and forming a closed-loop control path of magnetic field gradient compensation and mechanical vibration suppression. According to the invention, the stability and anti-interference capability of the measuring unit under severe working conditions can be improved.

The invention relates to the technical field of foamed aluminum detection, and discloses a foamed aluminum insulation detection method based on an eddy current effect. The method comprises the following steps: dividing a foamed aluminum sample to be detected into a plurality of detection units, and collecting eddy current signal data, material structure data and environmental parameter data of each unit to form a multi-source detection data set; then, an insulation defect evaluation index and a material stability evaluation index are constructed according to the multi-source detection data set, and an initial defect value is generated through a preset threshold mechanism; and dynamically correcting the initial defect value based on the material relevance of the adjacent detection units to obtain a corrected defect value. And finally, generating a priority list according to the corrected defect value sequence, and outputting an insulation performance evaluation result in combination with a visual tool. According to the method, comprehensive and accurate detection of the insulation performance of the foamed aluminum is realized, a systematic and effective technical scheme is provided for identification and evaluation of insulation defects of the foamed aluminum, and the method is suitable for insulation performance detection scenes in the production and application process of the foamed aluminum.

The invention relates to the technical field of electric energy metering, in particular to a high-precision voltage and current synchronous metering system of an alternating current and direct current integrated standard electric energy meter, which is characterized in that a hysteresis analysis module and an eddy current analysis module are used for respectively analyzing current signals to obtain a hysteresis intensity factor and an eddy current loss factor of the electric energy meter; a time scale weight and an instantaneous energy loss proportion are introduced through a hysteresis and eddy current coupling module, a comprehensive loss factor of an eddy current effect and a hysteresis effect is analyzed, self-adaptive distribution of weights of the eddy current effect and the hysteresis effect is realized, and primary compensation is performed on a current signal; the temperature compensation module analyzes the influence of the temperature on the electric energy meter, and performs temperature compensation on the voltage signal and the current signal. The system can effectively cope with complex dynamic working conditions, guarantees the temperature stability of measurement, cuts off the transmission and accumulation paths of errors from the source, improves the metering precision under AC / DC mixed signals, and guarantees the interpretability and reliability of the system.

This disclosure provides an X-ray imaging device and a wireless power transmission device with electromagnetic shielding. The wireless power transmission device includes: a first annular structure, on which a first frame is fixed, and a first winding is wound; a second annular structure, on which a second frame is fixed, and a second winding is wound; wherein the second annular structure is rotatable relative to the first annular structure; and a metal shielding assembly disposed relative to the first winding and / or the second winding, the metal shielding assembly being used to generate a reverse magnetic field based on the eddy current effect to weaken the main magnetic flux of the wireless power transmission device. This disclosure utilizes the reverse magnetic field generated by the metal shielding assembly based on the eddy current effect to weaken the main magnetic flux of the wireless power transmission device, thereby reducing magnetic field leakage and thus reducing electromagnetic interference of the wireless power transmission device.

The application relates to an axial-radial hybrid excitation magnetic bearing with a compensation winding, characterized in that the axial-radial hybrid excitation magnetic bearing comprises a rotor, an axial stator, a sleeve, a radial stator, a radial stator magnetic yoke, an axial control winding, a radial control winding, a permanent magnet ring and a compensation winding; the radial stator is arranged on the outer circumferential side of the rotor and comprises a plurality of radial stator iron core magnetic poles uniformly distributed in the circumferential direction and having the radial control winding wound thereon; two axial stators are symmetrically arranged on the upper and lower sides of the circumferential part of the rotor and the radial stator and the outer circumferential parts of the two axial stators are connected with the sleeve; the radial stator magnetic yoke is arranged on the outer circumferential side of the radial stator, and two permanent magnet rings are respectively arranged between the two axial stators and the radial stator magnetic yoke; the axial control winding is wound between the sleeve and the radial stator magnetic yoke; and two compensation windings are respectively arranged between the axial stators and the permanent magnet rings. The axial-radial hybrid excitation magnetic bearing has the advantages of compact axial and radial design, low power consumption, small volume, adjustable rigidity, inhibition of axial eddy current effect and high stability.

The present application relates to a kind of permanent magnet shielding motor vector control energy efficiency optimization method considering magnetic field lagging phase angle, belong to permanent magnet shielding motor control field.It is characterized by: by analyzing shield sleeve eddy current effect, the analytical expression of magnetic field lagging phase angle is derived using electromagnetic field theory;The lagging phase angle is introduced into permanent magnet flux linkage term to be corrected, and the eddy current loss of shield sleeve and stator iron loss are combined into equivalent iron loss component, and a system controllable loss model is constructed;Under the constraint of constant torque, the analytical expression of total controllable loss about direct-axis current is derived and the optimal direct-axis current given value is solved.The actual application introduces angle compensation in the coordinate transformation link of vector control system, and the optimal direct-axis current given value is sent into current regulator, the accurate decoupling of dq axis current is realized, the total loss of motor is reduced, so as to improve the overall efficiency of motor control system.

The invention relates to the technical field of nuclear facility pipeline heating. The invention provides a pipeline heating device and an in-reactor test facility. The pipeline heating device comprises a magnetic conduction layer, a heat conduction layer, a heat preservation layer and an electromagnetic induction coil, the magnetic conduction layer is made of a magnetic alloy material, and the magnetic conduction layer is enclosed and internally forms a heating area used for containing a pipeline; the heat conduction layer is located on the side, facing the heating area, of the magnetic conduction layer and used for transmitting heat of the magnetic conduction layer to the pipeline. The heat preservation layer wraps the side, away from the heating area, of the magnetic conduction layer. The electromagnetic induction coil is wound around the side, away from the heating area, of the heat preservation layer. The magnetic conductive layer made of the magnetic alloy material serves as a main absorption and conversion carrier of magnetic field energy, the eddy current effect can be remarkably enhanced, the problem that the heating efficiency is insufficient due to low magnetic conductivity of the austenitic stainless steel pipeline is solved, and the heating efficiency is greatly improved. The arrangement of the magnetic conductive layer can fundamentally avoid material microscopic damage caused by direct action of a magnetic field, and the safety is higher.

This invention discloses an R-T-B sintered magnet with reduced eddy current losses, its preparation method, and its application. The magnet has partition grooves on one or two orientation surfaces, where each orientation surface is perpendicular to the orientation direction of the magnet. The partition grooves extend through the magnet in a first extension direction but not in a second extension direction. The first extension direction of the partition grooves is perpendicular to the orientation direction of the magnet, and the second extension direction is parallel to the orientation direction of the magnet. By creating crisscrossing partition grooves on the magnet and filling them with an insulating layer, this invention increases the resistivity of a thin layer on the magnet's surface by a certain thickness, significantly reducing motor power loss due to eddy current effects. The insulating layer filling the grooves increases the resistivity of both the magnet surface and the grooves, effectively preventing conduction due to poor processing or current breakdown when the groove width is narrow. It also compensates for the reduction in mechanical strength caused by the grooving, ultimately resulting in a low-eddy-current, high-strength sintered magnet.

The invention provides a foreign matter detection system and method for an electric vehicle wireless charging system, and belongs to the technical field of electric vehicle wireless charging, and the foreign matter detection system comprises a double-comb-shaped self-resonance detection coil module, a high-frequency signal excitation module, a signal processing and detection module and a main control and discrimination module. The foreign matter detection method comprises the following steps: S1, calibrating initial parameters of a system and establishing a reference; and S2, real-time monitoring and foreign matter discrimination. According to the invention, the double-comb-shaped self-resonance detection coil module is designed, so that the adverse effect of an eddy current effect on a detection system is effectively eliminated in principle, noise in a detection signal is remarkably reduced, complete decoupling with a power magnetic field is realized, mutual independence of foreign matter detection and wireless energy transmission is ensured, a detection blind area is avoided, and the detection accuracy is improved. And a detection method based on orthogonal demodulation is introduced, so that the detection accuracy is improved.

The invention relates to the technical field of pipeline filters, in particular to a vertical pipeline filter which comprises a vertical mounting pipe and a transverse mounting pipe, the transverse mounting pipe is communicated with the vertical mounting pipe, a mounting disc and a partition disc are sequentially arranged in the vertical mounting pipe from bottom to top, and a closed cavity is formed between the mounting disc and the partition disc. A filtering and adsorbing assembly is arranged in the vertical mounting pipe and is of a conical structure, a plurality of flow guide pipes are circumferentially distributed at the narrower bottom of the filtering and adsorbing assembly around the conical inclined surface of the filtering and adsorbing assembly, a vortex structure is formed by the flow guide pipes, and the flow guide pipes are communicated with the transverse mounting pipe through a closed cavity; an eddy current assembly is arranged at the top end in the filtering and adsorbing assembly and comprises a wind shield of a conical structure, a plurality of rotating assemblies are sequentially arranged at the narrow bottom of the wind shield from bottom to top, and the rotating assemblies are sequentially enlarged from bottom to top and used for improving the eddy current effect.

The utility model relates to the technical field of anti-vibration, and discloses a high-damping anti-vibration seat of integrated circuit equipment, which comprises an anti-vibration seat and a base. According to the high-damping anti-vibration seat of the integrated circuit equipment, through the arrangement of the supporting seat, the base, the damping mechanism and the elastic mechanism, when the integrated circuit equipment is vibrated, the acting force borne by the supporting seat can be transmitted to the piston rod, the piston rod is forced to vibrate, and magnetorheological fluid is pushed to flow in the annular cavity; a magnetic field generated by the permanent magnet array enables magnetorheological fluid particles to form a chain-shaped structure, fluid shear stress is greatly increased, nonlinear viscous resistance is generated, meanwhile, vertical reciprocating motion of the piston rod cuts magnetic induction lines of the permanent magnet array, an eddy current effect is triggered, reverse electromagnetic damping force is generated, and the damping effect is improved. Therefore, magnetic circuit cutting and fluid extrusion are achieved while movement of the piston rod is achieved, a composite energy dissipation mechanism of electromagnetic damping and viscous damping is formed, and the energy dissipation efficiency and the resonance peak suppression efficiency are remarkably improved.

The invention discloses a non-contact iron object positioning detection and marking system, which is particularly suitable for a building template embedded nut positioning scene. The system transmits an alternating magnetic field through the electromagnetic induction module to penetrate through a non-metal obstacle (such as a wood board), detects an eddy current effect generated by an iron object (such as a pre-embedded nut) and outputs a 0-10V voltage signal; the central processing unit locks the geometric center position of the object according to the minimum voltage value, and realizes multi-mode feedback through visual color circle zooming, buzzing frequency change and threshold alarm; and after the user triggers the marking key, the execution module automatically performs annular mark marking at the position of the central point. According to the scheme, the problems of penetrability accurate positioning and automatic marking of hidden iron objects are solved, and the construction efficiency and safety are remarkably improved.

The application provides a metal film thickness measurement method and device for tungsten gate chemical mechanical polishing, comprising a sensor probe, a power module, a signal excitation module, a differential amplification module, a synchronous demodulation module, a data acquisition and processing module; the sensor probe comprises coaxially arranged excitation coils, detection coils and balance coils; the signal excitation module drives the three-coil resonance module to induce eddy current effect at the metal film to be measured; the differential amplification module converts the equivalent impedance change caused by the eddy current effect in the coils into a differential signal, and simultaneously improves the dynamic range through low-noise amplification; subsequently, the synchronous demodulation module multiplies the differential signal with a reference signal, and extracts a direct current component proportional to the signal amplitude through a low-pass filter; the obtained voltage amplitude signal is input into the data acquisition and processing module; the application can significantly amplify the weak signal related to the film thickness, effectively suppress common-mode noise, obtain nanometer-level thickness resolution, and has a high signal-to-noise ratio.

The utility model provides a contra-rotating ducted fan power device which comprises a ducted shell, a center body, a rotating mechanism, a supporting mechanism and a driving mechanism, the center body, the rotating mechanism, the supporting mechanism and the driving mechanism are arranged in the ducted shell, a ducted inner space is formed in the ducted shell, and the center body is arranged in the center of the ducted inner space. The rotating mechanism, the supporting mechanism and the driving mechanism are all connected to the center body, the supporting mechanism is connected to the middle position of the center body, the driving mechanism is in transmission connection with the rotating mechanism, and the rotating mechanism comprises a first rotating mechanism body and a second rotating mechanism body; according to the contra-rotating ducted fan power device, the rotating directions of the two rotating mechanisms are opposite, the contra-rotating rotating mode can balance torque generated by rotating blades, vibration is reduced, the stability of a system is improved, the service life of the system is prolonged, meanwhile, the contra-rotating blades neutralize the eddy current effect, tail flow kinetic energy loss is reduced, and the service life of the system is prolonged. Therefore, higher thrust efficiency is realized.

The invention relates to an automobile drive-by-wire pedal angle sensor, which comprises an inductance module circuit, a Hall module circuit and a Hall switch circuit, and is characterized in that when a pedal is treaded down, the inductance module circuit outputs a voltage signal to a conditioning chip for signal amplification, compensation and conversion, and finally outputs a corresponding tent signal; the Hall module circuit outputs a voltage signal to the conditioning chip for signal amplification, compensation and conversion, and finally outputs a corresponding tent signal; the Hall switch outputs a high-low level; at the moment, the current signal and the high-low level of the switch are transmitted to an automobile braking and control system, so that an ECU (Electronic Control Unit) takes corresponding measures to each related module of the automobile. On the basis of the eddy current effect principle, a heterogeneous structure is added, two paths of inductance output are added, four paths of signals can be redundant in pairs, and the risk of common cause failure is reduced.

According to the high-sensitivity array type abrasive particle detection device, an excitation module is composed of an inner excitation coil, an outer excitation coil and an excitation source, the inner excitation coil and the outer excitation coil are wound in the same direction, and synchronous current is applied to the inner excitation coil and the outer excitation coil, so that a zero-magnetic-flux detection area is constructed between the inner excitation coil and the outer excitation coil; the detection module is a detection array composed of a plurality of induction coils, each induction coil is located in a zero magnetic flux area, when no to-be-detected object passes through the detection area, the induction voltage of the induction coils is zero, and when the to-be-detected object passes through the detection area, the magnetization and eddy current effect of the metal abrasive particles breaks the magnetic field balance, which is represented as the voltage change of the induction coils; the detection channel is located in an inner hole of the induction coil and used for ensuring that the to-be-detected oil sample passes through the detection area. The detection device provided by the invention can realize high-precision rapid detection of the metal abrasive particles in the oil, and is of great significance to fault diagnosis of rotating and reciprocating machinery.

This invention discloses a leakage current detection method for explosion-proof distribution boxes, specifically relating to the field of electrical safety technology in flammable and explosive environments. It addresses the problems of leakage signal attenuation and insufficient detection sensitivity caused by the eddy current effect of metal explosion-proof enclosures. The method acquires the original leakage current signal from the wires inside the box and constructs an eddy current compensation factor based on the enclosure material and thickness for gain compensation. Simultaneously, it collects the surface temperature distribution and three-dimensional magnetic field components of the enclosure, and determines the compensation failure state through collaborative analysis of the high-temperature region migration acceleration and magnetic field polarization angle offset. When compensation is effective, it calculates the area fraction of the spatial magnetic field curl on the enclosure surface; when its temporal gradient exceeds a preset threshold, it triggers a tripping action, overcoming the shielding effect of the enclosure eddy current on weak leakage current signals, and achieving high-sensitivity leakage current protection while maintaining explosion-proof integrity.

A steering chassis of a rail car comprises a car frame; the steering structure is movably arranged in the frame and is positioned at the central part; the guide rail structure is movably arranged on the lower wall surface of the chassis and is positioned at the central part; the utility model relates to the technical field of vehicle steering, and provides power for the whole device through the driving of the motors, when the vehicle frame runs to a turning position, the magnetic sheets pass through the aluminum sheets to generate a magnetic eddy current effect, and the magnetic sheets pass through the aluminum sheets to generate a magnetic eddy current effect. The speed of the end, located on the inner side of the turning, of the vehicle frame is reduced, the vehicle frame is deflected through the speed difference formed at the two ends of the vehicle frame so as to smoothly pass through the rail with the radian, when the vehicle runs to the tail end of the rail, the vehicle frame can be braked through the magnetic eddy current effect of the magnetic sheets and the aluminum sheets on the two sides of the rail, and through the structure, collision between the vehicle frame and the rail during turning is reduced; and stable braking at the tail end can be achieved, the service life of the vehicle is prolonged, and the running stability of the vehicle is greatly improved.

A stator comprises an annular silicon steel sheet, a plurality of salient poles are evenly distributed on the inner ring of the annular silicon steel sheet in the radial direction of the annular silicon steel sheet, and coil windings are wound around the salient poles; the rotor comprises a rotatable magnetic conductive ring located on the inner ring of the annular silicon steel sheet, a plurality of magnetic steels are uniformly arranged on the outer ring of the magnetic conductive ring in the radial direction, the polarities of magnetic poles on the sides, facing the salient poles, of all the magnetic steels are the same, and the magnetic steels and the salient poles are asymmetrically arranged; according to the scheme, repulsive force is formed between the stator and the rotor to drive the rotor to rotate through the position relation of the salient poles on the stator and the magnetic steel on the rotor and the structure that all the magnetic steel faces the salient poles with the same polarity, eddy current loss generated when a stator alternating magnetic field penetrates through rotor permanent magnets is avoided or weakened, and the conversion efficiency between electric energy and mechanical energy of the motor is improved; heating caused by an eddy current effect is reduced, temperature rise of the rotor is effectively controlled, permanent magnet demagnetization caused by high temperature is avoided, and the effective service life of the motor is prolonged.

The invention provides an instrument docking system and surgical robotic.The instrument docking system comprises an instrument box and a power box, the instrument box stores an electronic tag for identifying information, the power box is provided with an RFID module, the RFID module comprises an RFID circuit and an antenna board, the RFID circuit sends and receives radio frequency signals through the antenna board, and the radio frequency signals are sent to the power box through the RFID circuit. The RFID module is adopted for instrument butt joint, the cost is low, maintenance is easy, meanwhile, the antenna plate is a metal plate, the antenna and the magnetic isolation sheet are arranged on the antenna plate at intervals, the magnetic isolation sheet has the characteristic of high magnetic conductance, a transmission path is provided for a magnetic field, and the mechanical performance of the power box is improved. The eddy current effect of the metal plate is effectively avoided, communication of the antenna is not affected, the power amplification circuit is arranged in the RFID circuit, power amplification of radio frequency signals is achieved, and the reliability of communication and instrument butt joint is improved.

The invention provides an oil shale pyrolysis test system and method, and belongs to the technical field of oil shale pyrolysis. According to the system, oil shale and conductive metal particles are placed in a vortex reaction kettle, a feeding end and a gas steel cylinder are connected, and inert gas is introduced for protection. The built-in temperature monitoring device monitors the temperature and is connected with the heating device to calculate the average temperature. When the average temperature exceeds a preset value, the heating device applies alternating current to form an alternating current magnetic field to heat the conductive metal particles, and the oil shale is pyrolyzed to produce a shale oil-gas mixture. The conductive metal particles are efficiently heated through the eddy current effect, accurate temperature control is achieved, the product purity is improved and environmental pollution is reduced through inert gas protection, high adaptability and high resource utilization rate are achieved, and the oil shale pyrolysis efficiency and quality are remarkably improved.

The application provides a non-metal pipeline metal marker detection method and device based on an eddy current effect, and relates to the technical field of non-metal pipeline detection. The method installs a metal marker carrying binary code on a pipeline, excites the eddy current effect of the metal marker by applying an alternating magnetic field, and picks up an induced magnetic field signal. The device adopts a double-D-shaped anti-phase series differential eddy current probe combined with a four-stage signal conditioning chain to improve the anti-interference ability and signal quality, and then extracts multi-domain features of the marker in the amplitude, phase and frequency spectrum. By matching the extracted features with a preset database, the device accurately analyzes the binary code and spatial position of the metal marker, thereby uniquely determining the identity information of the pipeline, including the ownership, material, burial depth and direction, etc. The application realizes high-precision positioning, large-capacity identity code and strong anti-interference detection, and effectively solves the problems of weak anti-interference, small code capacity and limited detection depth and precision in the existing non-metal pipeline positioning technology.

The invention provides a method for spraying an epoxy coating on the surface of a special-shaped magnet, which comprises the following steps: firstly, placing the special-shaped magnet on a jig with the top surface upward, and carrying out dust removal and preheating treatment on the special-shaped magnet; then four spray guns are used for spraying epoxy paint to the special-shaped magnet from four directions, one spray gun is used for spraying the epoxy paint towards the inner corner direction of the special-shaped magnet, and the other three spray guns are used for spraying the epoxy paint towards the other three corners of the special-shaped magnet; the spraying pressure and the atomization pressure of the spraying gun facing the inner angle are larger than those of the other three spraying guns, the sprayed special-shaped magnet is dried in a stepped curing and temperature rising mode after spraying is completed, cooling is conducted after drying, the cooled special-shaped magnet is turned over till the bottom face faces upwards, and then the special-shaped magnet is taken out. And finally, the spraying and drying processes are repeated. Through the process steps and setting of spraying parameters, the problems caused by the eddy current effect are solved, and the surface compactness and uniformity of the special-shaped magnet epoxy coating are improved.

The utility model discloses a magnetic eddy current brake device. The magnetic eddy current brake device comprises a brake caliper; the brake structures are respectively and movably embedded in the brake calipers and are positioned at the central part; the utility model relates to the field of brake devices, in particular to a brake device, which comprises a brake caliper, a main shaft, a pair of pistons, a brake disc and a pair of sensing metal rings with the same structure, and is characterized in that the brake caliper is fixed on a vehicle body, the brake disc is fixed on the main shaft, and the device is fixed; before the brake pad makes contact with the brake disc, the magnetic block and the induction metal ring continuously approach to generate a magnetic eddy current effect and generate a speed reduction effect on the main shaft, and as the magnetic block and the induction metal ring decelerate the main shaft before the brake pad makes contact with the brake disc, the brake pad can brake the brake disc more easily, abrasion of the brake pad is effectively reduced, and the service life of the brake pad is prolonged. Through the structure, the brake performance of the device is improved, and the loss of the brake pad is greatly reduced.

The application belongs to the technical field of magneto-fluid damper, and particularly discloses a magneto-rheological damper with quick response characteristic, which comprises a cylinder body and a piston rod, a piston head is vertically and slidably arranged in the cylinder body, a damping passage gap is formed between the piston head and the side wall of the cylinder body, the piston head comprises a sleeve and a magnetic core, the magnetic core comprises a plurality of magnetically conductive sheets which are connected with each other and sequentially connected along the circumference of the sleeve, a winding groove is formed in the magnetically conductive sheet, the piston rod is inserted into the cylinder body and coaxially connected with the sleeve, the chambers above and below the piston head are working chambers, and the working chambers are filled with magneto-rheological fluid. The application can effectively solve the time lag caused by the eddy current effect hindering the rise of the magnetic field strength in the damping passage, and improve the response speed of the magneto-rheological damper.

The utility model discloses a heating device suitable for acupuncture needles of multiple specifications, which comprises a casing, a high-frequency generator is mounted at the bottom end in the casing, a PLC (programmable logic controller) and a timer are mounted in the casing above the high-frequency generator, and an induction coil is fixed in the casing above the PLC. During operation, the high-frequency generator is used for generating an alternating electromagnetic field, an eddy current effect is generated at the needle point of the acupuncture needle through the induction coil, eddy current is converted into heat energy in the metal needle body, the temperature of the needle point can be rapidly increased, the heating time can be controlled within 2-3 seconds, and then the device utilizes the high-frequency eddy current electromagnetic induction principle. Heating of the acupuncture needle can be completed within 5 seconds through the non-contact eddy current heating technology, compared with traditional fire needle heating, 70% of time is saved, the operation efficiency is high, non-open-fire operation is achieved, noise, pollution and scalding are avoided, safety isolation design is achieved, electric shock and cross infection risks are avoided, and the limitation of traditional open-fire heating is broken through.

The application discloses a paper folding structure inductive self-decoupling micro six-dimensional force sensor, and belongs to the technical field of force sensors. The paper folding structure inductive self-decoupling micro six-dimensional force sensor comprises a base, a folded flexible circuit board, a metal shell, a communication cable, a coil inductance measurement circuit and an elastomer. The folded flexible circuit board comprises a coil array and an inductance measurement circuit. The coil array is folded on the upper surface and four side surfaces of the base. The inductance measurement circuit is folded on the bottom of the base and leads out the communication cable. The metal shell is arranged above the base and surrounds the surfaces of the folded flexible circuit board except the bottom surface. The elastomer is arranged between the metal shell and the base. The elastomer converts the six-dimensional force borne by the metal shell into six-dimensional displacement. The sensor is sensitive to the normal displacement and insensitive to the tangential displacement and rotation by utilizing the eddy current effect, and realizes the self-decoupling measurement of the six-dimensional displacement of the metal shell by combining the three-dimensional coil layout, so that the self-decoupling six-dimensional force measurement is realized. The sensor can be integrated into a dexterous finger tip to provide endogenous tactile perception.

The invention discloses a rotor identification device and method, and the device comprises a rotor unit and a stator unit, the rotor unit is connected with at least one rotor ID identification unit, the rotor ID identification unit comprises a plurality of flag bits, the flag bits can be provided with or not provided with identification members, the stator unit is connected with an eddy current transmitting and receiving unit, and the eddy current transmitting and receiving unit is connected with the rotor unit. The eddy current transmitting and receiving unit is used for transmitting a high-frequency oscillation electromagnetic field to the rotor ID identification unit after high-frequency driving current is introduced, an eddy current field generated in the identification piece changes the amplitude and phase of the high-frequency driving current, and the stator unit is connected with a data processing unit. According to the rotor identification method, the identification piece and the eddy current effect are adopted, rotor identification is not interfered by the magnetic field of the motor, the identification stability is improved, the coding capacity can be conveniently expanded by increasing the number of the flag bits, flexible increase and decrease of the number of the rotors are supported, and the problem that multiple rotors on the magnetic suspension planar motor are difficult to identify is solved.

The invention relates to the technical field of pipeline vibration energy dissipation, in particular to a negative stiffness magnetic liquid pipeline vibration absorption device with an eddy current effect, which comprises a vibration reduction shell, a copper pipe inner cylinder is arranged in the vibration reduction shell, and a rotor permanent magnet is movably arranged in the copper pipe inner cylinder; two ends of the copper pipe inner cylinder are respectively connected with a first electromagnetic module and a second electromagnetic module, and the first electromagnetic module and the second electromagnetic module generate an induced magnetic field which attracts the rotor permanent magnet after being electrified; a first stator permanent magnet is fixedly mounted on the first electromagnetic module, a second stator permanent magnet is fixedly mounted on the second electromagnetic module, and the first stator permanent magnet and the second stator permanent magnet are mutually exclusive with the rotor permanent magnet in the same polarity; a closed sealing cavity defined by the copper pipe inner cylinder, the first electromagnetic module and the second electromagnetic module is filled with magnetic liquid. Effective combination of the negative stiffness electromagnetic force mechanism, the magnetic liquid and the eddy current damping unit is achieved, and broadband, efficient and semi-active vibration suppression of pipeline vibration is achieved.