1063 results about "Magnetic sensing" patented technology

The invention discloses a wide-dynamic-range diamond NV color center magnetic sensing method and system, and the method comprises the steps: (1) calibrating the initial resonant frequency and magnetic sensing coefficient of a diamond NV color center in an initial magnetic field environment; (2) in a to-be-measured magnetic field environment, a microwave generator applies frequency-modulated microwaves to the diamond NV color center with the current resonant frequency as the center frequency; demodulating the fluorescence signal in real time by using a phase-locked detection technology to obtain an error signal; calculating the detuning amount of the center frequency in real time according to the error signal and the magnetic sensing coefficient, and further calculating the variable quantity of the magnetic field intensity; meanwhile, the detuning amount is fed back to a microwave generator to track the resonance frequency of the diamond NV color center; and (3) continuously and repeatedly executing the step (2) to realize wide-dynamic-range magnetic field measurement. The method has the advantages of wide dynamic range, high detection capability on strong and weak field mixed signals in a complex application scene and the like while giving consideration to the magnetic sensing sensitivity.

The invention discloses a J-A model parameter identification method, system, equipment and medium based on RBF and an improved brownish bear algorithm, and belongs to the technical field of power system optimization, and the method comprises the steps: building a Jiles-Atherton hysteresis reverse model of a current transformer, determining a to-be-identified parameter vector, and building a model with a root-mean-square error between actually measured magnetic field intensity and simulated magnetic field intensity as a target function, training a radial basis function neural network model, expanding data through linear interpolation processing, obtaining a predicted magnetic induction intensity value, inputting an objective function and radial basis function prediction data into an improved brownish bear optimization algorithm, and iteratively optimizing model parameters through hierarchical population position updating and fitness evaluation until convergence conditions are met. And outputting an optimal parameter identification result. According to the method, high-precision and high-efficiency identification of hysteresis model parameters is realized, the generalization capability and robustness of the system are improved, and reliable technical support is provided for hysteresis characteristic analysis of a complex physical system.

The invention relates to the field of buried facility monitoring, and discloses a piezoelectric cantilever vibration sensing and super capacitor self-powered energy closed-loop operation method and system, and the method comprises the steps: building a star array composed of a master pile and a slave pile, and configuring a TDMA time slot and an uplink message length; the slave pile collects a vibration signal through a piezoelectric cantilever, the vibration signal is rectified by a piezoelectric rectification energy taking module and then charges a super capacitor, and the voltage state of the two ends of the super capacitor is obtained; when the voltage state reaches a preset upper threshold, the boosting module supplies power to the processing circuit and the transmitting circuit of the slave pile, and the processing circuit generates a four-byte feature code; the slave piles send four-byte feature codes in a magnetic induction link according to TDMA time slots, the master pile receives and aggregates the four-byte feature codes sent by the multiple slave piles, completes positioning and fusion according to the arrival time difference, and returns the four-byte feature codes to the platform through LoRa and 4G, and the platform completes storage and output according to the four-byte feature codes and a positioning result. According to the invention, end-side cloud connection and replicable deployment can be realized, and low-frequency vibration acquisition and buried communication are adapted.

The invention discloses a highly packaged magnetic sensing chip based on an NV color center, and the chip comprises a packaging housing (1) which is provided with a packaging pedestal and chip pins. The chip is characterized in that the chip also comprises an NV color center diamond (2) which is arranged on the packaging base; the laser diode bare chip (3) is arranged on the packaging base, and the light-emitting side of the laser diode bare chip faces the NV color center diamond; the microwave transmission microstrip line (4) is arranged between the interior and the edge of the packaging base and is electrically connected with the chip pins; the first photoelectric detector assembly (5) is arranged on the NV color center diamond and used for collecting fluorescence signals.

The invention belongs to the technical field of encoder signal processing, and particularly relates to an encoder capable of realizing non-contact rotation through a measurement magnetic ring of a magnetic induction technology and a TMR magnetic induction read head encoder, performing digital signal processing through a DSP under the driving of a high-speed motor, and integrating signal direct-current bias, amplitude phase difference correction and temperature detection through a program. High-precision position feedback is achieved by subdividing and encoding sine and cosine orthogonal signals inductively output by the measuring magnetic ring, the RS485 protocol communication has the advantages of being high in anti-interference capacity and rich in communication protocol, state monitoring information can be obtained while position information is obtained, motor parameters and encoder parameters can be stored in a built-in mode, and high-precision position feedback can be achieved through a driver. The upper computer is used for reading and modifying, operation is convenient, and the application range is wide.

The invention relates to the technical field of high-precision positioning, in particular to a high-precision six-degree-of-freedom magnetic positioning system and method, and the method comprises the steps: generating a three-dimensional low-frequency magnetic induction field with a preset frequency in a space through a three-axis orthogonal transmitting coil; detecting the three-dimensional low-frequency magnetic induction field through a three-axis orthogonal receiving coil to obtain an induced voltage signal; transmitting the digitized induced voltage signal to a control layer; in the control layer, the position and attitude of the receiver are estimated in real time by using a joint estimation algorithm fusing error state extended Kalman filtering and particle swarm optimization; the error state extended Kalman filtering comprises the steps of constructing a state transition matrix F of a target carrying a receiver, and constructing a process noise covariance matrix Qk and a parameterized measurement noise covariance matrix R of the system through translation acceleration noise sigma a and rotation noise sigma omega. According to the invention, the PSO module is utilized to dynamically and adaptively adjust the key parameters of the ESKF, and high-precision positioning and low-delay response are realized.

The invention discloses a non-intrusive ground fault patrol method, device and system based on synthetic magnetic field break variable identification, and belongs to the technical field of power system automation. In order to solve the problems that traditional ground fault detection needs contact measurement, complex terrain adaptability is poor, and fault types cannot be quantitatively distinguished, an unmanned aerial vehicle carries a magnetic sensing module to collect line magnetic field data and attitude angles, and after hardware shielding + Kalman filtering noise reduction and attitude angle coordinate correction, the fault types are subjected to fault detection. A sliding window algorithm is adopted to identify a magnetic field break variable and position a fault point, a random forest model is combined to extract fault feature parameters to distinguish fault types, and finally a map label and a disposal report are generated and pushed to an operation and maintenance terminal. The method realizes non-intrusive patrol, is suitable for high-resistance and intermittent grounding faults in mountainous areas and the like, improves the positioning efficiency by 40%, and provides technical support for intelligent operation and maintenance of a distribution network.

The invention provides a surface crack defect identification method and device based on machine learning, and relates to the technical field, and the method comprises the following steps: carrying out geometric scanning on a workpiece curved surface through an array type alternating current electromagnetic field sensor, and reconstructing a probe geodesic track in combination with an inertial measurement unit and a photoelectric encoder; a curved surface parameter field and an array element pose table are generated through fitting, and collected three-axis magnetic induction intensity vectors are converted into local components aligned with the crack length direction and the crack depth direction through direction cosine projection; the processed signals are demodulated and subjected to speed correlation correction to obtain a multi-frequency amplitude-phase feature cluster, and a physical consistency feature vector and geometric priori are generated by combining a curved surface forward model and a three-dimensional grid response library. And a machine learning model is obtained through joint loss training, butterfly diagram interpretation and pseudo defect decoupling are introduced in an inference stage to realize secondary check, and a crack existence label and a crack geometric parameter set are output. According to the method, the precision of identifying the surface crack of the large-curvature metal object can be improved.

The invention relates to the technical field of intelligent power grid abnormity diagnosis, in particular to an intelligent electric energy meter operation data abnormity diagnosis method and system. The method comprises the steps of establishing a sliding window, collecting magnetic induction intensity and load current data, maintaining references of the magnetic induction intensity and the load current data according to historical data, calculating the change direction and intensity of a sampling point relative to the references, screening data with enhanced magnetic induction intensity and reduced load current, and carrying out weighted covariance calculation by utilizing an effective mask. Constructing a negative correlation response coupling index; constructing an abnormal definite diagnosis confidence reasoning model; calculating a causal confidence factor based on the coupling index; calculating an aging confidence factor based on the duration of an abnormal state; according to the scheme, industrial interference and electricity stealing attacks can be accurately distinguished, hidden attacks are captured, the false alarm rate is reduced, and diagnosis blind areas are eliminated.

The invention provides a paramagnetic micro-nano magnetic particle magnetophoresis separation device and a paramagnetic micro-nano magnetic particle magnetophoresis separation method, and relates to the technical field of micro-nano magnetic particle separation and magnetic labeled biomolecule separation analysis. The separation device comprises a plurality of permanent magnets which have the same magnetism and the same size and are arranged above the separation channel at intervals in the direction of the separation channel, and a plurality of sets of mechanical structures which respectively drive each permanent magnet to move up and down in the vertical direction; the Hall sensor clings to the separation channel and is used for detecting the magnetic induction intensity at the separation channel; a liquid inlet device; a UV / Vis ultraviolet-visible light detector; a collection device and a computer. The magnetic induction intensity in the separation channel can be set, the critical diameter of the micro-nano magnetic particles capable of being captured by the magnetic field is determined, magnetophoresis separation of paramagnetic micro-nano magnetic particles is accurately achieved, the controllability of the magnetophoresis separation process is enhanced, and the separation effect of the micro-nano magnetic particles is improved.

The invention relates to the field of gas ejectors, in particular to a valve needle stroke monitoring device and method.The valve needle stroke monitoring device comprises a clamping mechanism, a magnetic induction mechanism, a double-guide reset mechanism and a shell mechanism, and the clamping mechanism is used for clamping a valve body of the gas ejector; the magnetic induction mechanism comprises an ejector rod, a magnet and a Hall effect sensor, one end of the ejector rod is configured to be in contact with the end part of a valve needle of the gas ejector, the magnet is arranged at the other end of the ejector rod, and the Hall effect sensor is arranged opposite to the magnet to detect the displacement of the magnet; the double-guide reset mechanism is used for providing axial reset force for the ejector rod; the shell mechanism is used for integrating the clamping mechanism, the magnetic induction mechanism and the double-guide reset mechanism. According to the method, the real-time stroke of the valve needle is calculated according to the difference value between the real-time position signal and the initial position signal. By adopting the technical scheme, the stroke of the valve needle can be directly measured in a high-precision, high-reliability and convenient-to-mount manner.

The invention relates to a design method of a magnetic shielding system and the magnetic shielding system.The design method of the magnetic shielding system comprises the steps that a shielding parameter calculation model of multi-layer cylinder magnetic shielding is established, parameters of the cylinder magnetic shielding serve as input, and shielding coefficients serve as output; performing optimization solution on the shielding parameter calculation model through a first optimization algorithm to obtain an optimal shielding parameter combination; the optimal shielding parameter combination is used for building a passive magnetic shielding cylinder; establishing a magnetic field calculation model generated by the magnetic field decoupling shimming coil in the passive magnetic shielding cylinder, taking the parameters of the cylinder magnetic shielding and the parameters of the shimming coil as inputs, and taking the magnetic induction intensities in the radial direction, the azimuth angle and the height direction as outputs; optimizing the magnetic field decoupling shimming coil configuration by adopting a second optimization algorithm based on the magnetic field calculation model to obtain an optimal coil configuration; the magnetic field decoupling shimming coil is wound in the passive magnetic shielding cylinder based on the optimal coil configuration. Through collaborative optimization of magnetic shielding and shimming coils, extremely weak magnetic measurement is realized.

Methods and apparatus for having heterogenous redundant angle sensing. In embodiments, an angle sensor has inductive sensing and magnetic sensing for a target having a magnetic portion and a metallic portion. In embodiments, the magnetic portion includes a ring magnet centered within the metallic portion, which can be referred to as a cap. In some embodiments, the target-facing side of the cap is sloped. In some embodiments, the target-facing side of the cap and the ring magnet are sloped.

Apparatuses, systems, and methods are provided for a magnetic sensing device including one or more linear magnetic sensors, such as Hall sensors. In some embodiments, the magnetic sensing device includes a housing, a substantially cylindrical shield mechanically coupled to the housing, a magnet disposed within a cavity defined by the substantially cylindrical shield, wherein the magnet defines a countersunk cavity, and / or a printed circuit board assembly (PCBA) disposed proximate a first end of the magnet opposite a second end of the magnet proximate an end of the housing proximate a measured medium.

This invention relates to the field of precision mechanical control technology, specifically to a method based on a magnetoelectric converter and linearity control. The method includes: acquiring raw magnetic induction data through a magnetoelectric converter; obtaining a three-dimensional magnetic field distribution through electromagnetic field spatial mapping and extracting the axial gradient vector field; constructing a virtual magnetic streamline model based on this to identify local disturbance regions where magnetic field distortion exceeds a threshold; performing multi-scale time-frequency analysis on the data in this region to separate high-frequency fluctuations caused by mechanical vibration and low-frequency drift components caused by thermal deformation; inputting the two components into a cross-coupled compensation decision network to generate high-frequency suppression commands and low-frequency compensation trajectories, which are then merged to form a comprehensive drive signal for compensation. This method can accurately locate the source of linearity disturbance and perform targeted decoupling control of errors from different physical sources, improving control accuracy and stability under complex operating conditions.

The invention relates to a method for detecting a sediment (21) in a magnetic-inductive flowmeter (1), wherein the magnetic-inductive flowmeter comprises: -- a magnetic field-generating device (7) for generating a magnetic field, wherein the magnetic field has a principal axis (HA); -- a measuring tube (8) for guiding a medium, wherein the medium comprises a liquid with solids distributed therein, which solids form the sediment, wherein a first longitudinal plane (LE1) intersecting the measuring tube (8) intersects the principal axis perpendicularly, wherein the first longitudinal plane (LE1) divides the measuring tube (8) into a first and second subsection (TA1, TA2); -- at least three electrodes, wherein a first electrode (E1) of the at least three electrodes is arranged in the first subsection (TA1) such that its own longitudinal axis (LA) lies in the first longitudinal plane (LE1), wherein a second electrode (E2) of the at least three electrodes is arranged in the second subsection (TA2), wherein the method comprises the following steps: - Providing an excitation signal at one of the at least three electrodes, in particular at the first electrode (E1); - Tapping off a first measurement signal at the first electrode (E1) against the second electrode (E2); - Providing a further excitation signal at one of the at least three electrodes, in particular at a third electrode (E3); - Tapping off a second measurement signal at one or the third electrode (E3) of the at least three electrodes against the second electrode (E2), wherein the third electrode (E3) is arranged in the first subsection (TA1) such that its own longitudinal axis (LA) lies in the first longitudinal plane (LE1), wherein the first and second measurement signals are independent of a flow velocity of the medium; - Determining a sediment index taking into account the first and / or second measurement signal.

The utility model discloses a wireless temperature sensor. The wireless temperature sensor comprises a housing which is internally provided with an accommodating space; the power supply module is arranged in the accommodating space of the shell and can take electricity through magnetic induction; the printed circuit board is arranged in the accommodating space; the temperature sensing module is electrically connected with the printed circuit board; a micro-processing module electrically connected to the printed circuit board; the wireless communication module is electrically connected to the printed circuit board, and the wireless communication module is provided with a communication chip; the antenna element is used for transmitting and receiving wireless signals, the working communication frequency band of the antenna element is Sub-1G, and an inverted U-shaped structure is adopted. The wireless temperature sensor is small and exquisite in structure and higher in use performance.

This invention aims to provide a thin, magnetically attached torsion spring magnetic induction key structure with a simple and compact structure, providing tactile feedback and a tactile click when pressed. The invention includes a circuit board, keycaps, a scissor-switch assembly, a base, a magnetic component, a Hall sensor, and a torsion spring. The Hall sensor and the base are both mounted on the circuit board. The base has a recessed groove adapted to the Hall sensor. One end of the scissor-switch assembly is movably connected to the base, and the other end is rotatably connected to the keycap. The magnetic component is mounted on the scissor-switch assembly and adapted to the Hall sensor. The torsion spring has a first fulcrum, a second fulcrum, and a third fulcrum. The first fulcrum engages with the keycap, the second fulcrum engages with the magnetic component, and the third fulcrum engages with the circuit board. This invention applies to the technical field of magnetically attached induction keyboards.

The headphone comprises a head beam, two ends of the head beam are respectively connected with an ear shell, a PCBA circuit board, a loudspeaker and a noise reduction microphone are installed in the ear shells, the PCBA circuit board is electrically connected with the loudspeaker and the noise reduction microphone, the PCBA circuit board is located on the rear side of the loudspeaker, and the loudspeaker is electrically connected with the noise reduction microphone. A Hall switch and a control module are arranged; a lifting air bag is installed in the rear end of the ear shell, the rear end of the lifting air bag is connected with a lifting cover, when the lifting air bag ascends backwards, the lifting cover can be opened backwards from the rear end of the ear shell, and when the lifting air bag descends forwards, the lifting cover can cover the rear end of the ear shell forwards. A permanent magnet is mounted at the joint of the lifting cover and the lifting air bag; and the Hall switch and the permanent magnet are opposite in position and are in magnetic induction fit. According to the invention, the headphone can be switched between the noise reduction mode and the transparent mode by raising or lowering the lifting air bag, so that external personnel can conveniently observe and judge whether the headphone is in the noise reduction mode or the transparent mode.

The invention provides a drilling gas cut monitoring method and device based on a magnetic induction effect, and the method comprises the steps: pumping drilling fluid carrying magnetic particles marked by a magnetic marker into a shaft, and measuring the nearby magnetic field intensity through a magnetic signal induction short section arranged at the bottom of the shaft to obtain magnetic field data; and acquiring gas cut monitoring data according to the change condition of the magnetic field data in the preset period. Therefore, by monitoring the magnetic signal which responds to the gas cut very quickly, advanced early warning of the early trace gas cut is realized, and the response speed and sensitivity are superior to those of a sound wave or resistivity method; by actively introducing a magnetic marker and adopting a differential detection and temperature compensation algorithm, the problems that a resistivity method is greatly interfered by a stratum and a sound wave method is seriously influenced by well conditions and noise are effectively solved, the anti-interference capability is high, and the reliability is high.

The invention relates to a method for checking the thickness of a friction layer (16) comprising at least one hard material, which covers a magnetizable base body (12) of a brake disc (10) for a motor vehicle, in which the thickness of the friction layer (16) is determined by means of a measuring device by generating a magnetic field (26) in a magnetic-inductive measuring method.

A control method for a cleaning component, and a cleaning component, a computer-readable storage medium and an electronic device. The cleaning component comprises a magnet, the cleaning component is detachably arranged on a lifting sleeve in a cleaning module, the lifting sleeve is at least partially made of a material which generates a magnetic force with the magnet, and a driving electric motor and a magneto-sensitive sensor are further provided in the cleaning module. The control method for a cleaning component comprises: after a cleaning component control instruction is received, collecting, by means of a magneto-sensitive sensor, magnetic induction data generated by a magnet, so as to detect an initial position of a target cleaning component (S110), wherein the cleaning component control instruction comprises an installation instruction or a removal instruction; and on the basis of the type of the cleaning component control instruction and in combination with at least one of mileage data of a driving electric motor and the magnetic induction data, controlling the target cleaning component to move from the initial position to a desired position, so as to implement an installation or removal operation on the target cleaning component (S120).

The invention relates to a transformer leakage inductance calculation method and device and computer equipment. The method comprises the following steps: acquiring magnetic induction intensity and vector magnetic potential of any point in an iron core window; obtaining magnetic field energy in an iron core window area based on the magnetic induction intensity and geometric parameters of the iron core window; based on the vector magnetic potential and the cross section size of the winding area, obtaining interaction energy of the current and the vector magnetic potential in the winding area; on the basis of the interaction energy and the magnetic field energy, magnetic leakage energy stored by a unit length winding is obtained; the leakage inductance of the transformer is obtained based on the total leakage flux energy of the winding and the winding current of the low-frequency equivalent circuit, and the total leakage flux energy is obtained through calculation based on the leakage flux energy stored by the winding per unit length and the winding length.

The application belongs to the technical field of control system, and particularly relates to a composite heating method and system for starting and running of a molten salt pipeline, which comprises a resistance electric heat tracing band evenly laid along the outer wall of a pipeline to be heated, and an electromagnetic induction heat tracing device arranged on a set pipe section of the outer wall of the pipeline at a specific interval; when the pipeline is in an empty pipe state, the resistance electric heat tracing band is started, and the whole pipeline is heated to a first preset temperature higher than a solidification point of molten salt according to a pipe wall temperature; when the whole pipeline temperature reaches the first preset temperature and is maintained for a set time, and the temperature field stability condition and the heat preservation duration condition are met, molten salt is injected into the pipeline, then the resistance electric heat tracing band is turned off, and the electromagnetic induction heat tracing device is started; at this time, the molten salt medium temperature at the outlet of the pipeline is taken as a control target, and the temperature of the molten salt in the pipeline is maintained at a higher second preset temperature by independently adjusting the power of each distributed electromagnetic induction heat tracing device. Through coupling of the heating mode and the medium state, a balance is achieved among safety, energy consumption and temperature control.

The positioning method of underground pipeline laying system based on rotary permanent magnet magnetic beacon belongs to the technical field of underground navigation positioning. The present application solves the problem of low positioning accuracy and high complexity of the existing positioning method of underground pipeline laying system. The present application analyzes the magnetic induction intensity distribution law of the rotary permanent magnet magnetic beacon, and then analyzes the propagation process of the magnetic field intensity in the metal pipeline by using the boundary theory of electromagnetic field. Based on the propagation process of the magnetic field intensity in the metal pipeline, the rotary permanent magnet magnetic beacon positioning technology is established to realize the positioning service for the underground straight pipeline equipment. Since the cumulative error is avoided, the present application improves the accuracy of the position estimation of the underground pipeline laying system, and does not need the process of stopping calibration, thereby reducing the complexity of the positioning of the underground pipeline laying system and improving the positioning efficiency, and indirectly improving the efficiency of the underground pipeline laying. The present application can be applied to underground navigation positioning.

The invention relates to a planar magnetic integration converter suitable for a distributed photovoltaic matrix transformer ISOP, which aims at a transformer module in LLC topology, adopts an ISOP matrix transformer planar integration method, and integrates and applies a plurality of transformer units into a unified four-column magnetic core. Adjacent magnetic columns have opposite magnetic induction directions through a specific winding mode, so that the magnetic flux density of a magnetic core plane is uniformly distributed by utilizing a magnetic line cancellation method, the maximum peak value is reduced to 1 / 2 of that of a traditional discrete transformer scheme, and low-voltage power supply is provided for a control chip through an auxiliary winding. And the four magnetic columns are wound in parallel, so that the customized high transformation ratio can be conveniently realized, the magnetic field consistency of each magnetic column transformer unit is ensured, finally, the planar magnetic integrated converter device of the matrix transformer ISOP is formed, and the better EMI characteristic is realized.

The invention relates to a magnetic-inductive flowmeter having a measuring tube for conducting a flowable medium, the measuring tube having a wall; at least three measuring electrodes which are arranged in the wall and which form an electrical contact with the flow medium; at least one magnetic-field generating device for generating a magnetic field through the medium; and a measuring circuit which is designed to ascertain at least one first measuring variable, wherein the measured value of the first measuring variable is ascertained at a first pair of measuring electrodes. The invention is characterized in that the evaluation circuit is designed to ascertain a Reynolds number and / or a kinematic viscosity value of the medium in the measuring tube using the measured value of the first measuring variable and the measured value of a second measuring variable which is different from the first measuring variable, the measured value of the second measuring variable being ascertained at a second pair of measuring electrodes.

The application discloses a low-speed unmanned steering controller and method, the controller comprises a main control unit CPU and a pre-drive circuit, the output end of the main control unit CPU is connected with the pre-drive circuit, and the pre-drive circuit is used for driving the action of a steering motor; the controller further comprises a magnetic induction angle chip, a corresponding sensor magnet of the magnetic induction angle chip is arranged on a motor output shaft, the magnetic induction angle chip acquires an angle signal by analyzing a sensor magnet signal, and the output end of the magnetic induction angle chip is connected with the main control unit CPU. The steering controller is stable and reliable, the angle detection of the steering motor is performed by using a magnet and an angle sensor chip, the installation and production are simpler, the complicated installation process of the sensor body in the prior art is solved, and the manufacturing period of the steering controller is shortened.

The invention discloses a magnetic encoder button which is used for being matched with a magnetic induction element to convert angular displacement into an electric signal, the magnetic encoder button comprises a button base, a magnetic part and a rotary knob and further comprises a worm and a sliding block, the worm is arranged on the lower portion of the rotary knob and can rotate along with the rotary knob, the sliding block is arranged in the button base and can move up and down in the button base, and the magnetic part is assembled on the sliding block; the worm is in transmission connection with the sliding block and rotates left and right to drive the sliding block to drive the magnetic piece to move up and down. The rotation detection function of the encoder is successfully combined with the installation form of a traditional key, so that a single key can output a rotation encoding function; the overall structure is completely compatible with a standard magnetic axis switch, plug and play is realized, and the process is greatly simplified; in addition, a unique design of a reset through groove and a reset piece is provided, so that the magnet can automatically and rapidly rebound to a central initial position at a stroke end point, and the magnet can infinitely move back and forth in the stroke and continuously output coding signals during continuous unidirectional rotation.

This invention relates to an Fe-Ni based alloy with enhanced soft magnetic properties utilizing a medium-range ordered structure and its preparation method. The chemical formula of the alloy is: Fe bal Ni a Cr y Si b B c M d Cu e X f Its microstructure is as follows: the alloy matrix is ​​mainly amorphous, with dispersed atomic-scale medium-range ordered (MRO) clusters comprising 15%–40% by volume. The size of these clusters is controlled between 1 nm and 5 nm, and no long-range crystalline phases larger than 10 nm are formed. By introducing Ni element to couple magnetic moments with Fe to reduce the saturation magnetostriction coefficient, and by using a low-temperature relaxation annealing process to control the pre-precipitation behavior of Cu element, a high-density MRO-reinforced framework is established in the amorphous matrix. This material possesses high saturation magnetic induction, low coercivity, and excellent high-frequency permeability, which can improve the problems of large magnetostriction coefficients and high high-frequency noise in existing high-Bs iron-based nanocrystalline alloys. It is particularly suitable for high-frequency high-power transformers and wireless charging magnetic shielding modules.