54 results about "Magnetic effect" patented technology

The invention discloses a magnetic-mechanical-electric coupling amplitude-change pole simulation method based on finite element analysis, and relates to the technical field of magnetoelectric antenna simulation. The magnetic-mechanical-electric coupling amplitude-change pole simulation method based on finite element analysis comprises the steps that parametric modeling is carried out, and a multi-physical field environment is imported; defining material attributes; solid mechanics, an electrostatic field and a magnetic field are coupled, and piezoelectric and piezomagnetic effects are started; dividing grids and configuring a solver; executing simulation calculation; and evaluating displacement and stress results and performing iterative optimization. According to the magnetic-mechanical-electric coupling amplitude-change pole simulation method based on finite element analysis, through multi-physics field coupling simulation, electric-mechanical-magnetic energy conversion is accurately simulated, the problem of traditional simulation distortion is solved, a high-performance amplitude-change pole capable of amplifying the amplitude of a permanent magnet sheet to 9 micrometers is guided to be designed, and the radiation capacity and reliability are remarkably improved.

The present disclosure relates to a method (100) of magnetically calibrating a magnetometer sensing system (30) with respect to an electronic device (50), the method (100) comprising: detecting (110) a disturbing magnetic source (520) in the electronic device (50) relative to a reference coordinate system (X, Y, Z) of the magnetometer sensing system (30); identifying (120) one or more magnetometers (Sk,l) of the magnetometer sensing system (30) which are magnetically affected by the detected disturbing magnetic source (520); selecting (130) one or more balancing magnetic sources (400) to reduce a magnetic effect of the detected disturbing magnetic source (520) on the one or more identified magnetometers (Sk,l); and placing (140) the one or more selected balancing magnetic sources (400) in a fixed relation to the magnetometer sensing system (30) and / or to the disturbing magnetic source (520).

A kind of eddy current testing probe and method for identifying any crack and direction around hole, the probe includes a pie-shaped detection coil with middle magnetic core, the magnetic core not only ensures accurate positioning, but also uses magnetic collection effect by enhancing coil inductance, to strengthen the magnetic field inside and back of hole.The probe is also equipped with three layers of excitation coil, one layer and two layers of coil are arranged orthogonally, three layers and one layer of coil are at an angle of 135 °, realize the efficient detection of any direction crack and identify the direction of any crack defect.The flexible support of probe enables it to adapt to curved surface structure, widen the application range.The detection method uses orthogonal differential technology, uses the symmetry of hole structure to identify defects around hole, significantly improve the detection sensitivity of defects on the back and inside of hole structure.Compared with traditional surface and near-surface defect eddy current testing technology, the present application provides a more effective solution for high-precision detection of hole structure through innovative coil configuration and defect identification method.

The invention discloses a friction-free spring type safety valve, belongs to the field of pressure vessel protection, and aims to solve the problem of large friction force of a large-diameter valve rod of a steam extraction pipeline of a steam turbine. Comprising an upper guide assembly and a lower guide assembly, the upper guide assembly comprises a second permanent magnet ring, the lower guide assembly comprises a first permanent magnet ring, the upper portion of a valve rod assembly is sleeved with an upper magnetic ring, the lower portion of the valve rod assembly is sleeved with a lower magnetic ring, and the first permanent magnet ring, the second permanent magnet ring, the lower magnetic ring and the upper magnetic ring are all axially magnetized magnetic rings. The upper magnet ring and the lower magnet ring are arranged in a homopolar opposite mode, the polarity directions of the upper magnet ring and the second permanent magnet ring are the same, the upper magnet ring and the second permanent magnet ring form a magnetic action gap, the polarity directions of the lower magnet ring and the first permanent magnet ring are the same, and the lower magnet ring and the first permanent magnet ring form a magnetic action gap. The radial magnetic effect resultant force of the second permanent magnet ring on the upper magnetic ring points to the axis of the upper guide assembly, the radial magnetic effect resultant force of the first permanent magnet ring on the lower magnetic ring points to the axis of the lower guide assembly, and the friction force of the valve rod assembly is zero.

A power contactor comprising a fixed part and a movable part translated relative to the fixed part in a displacement direction between a contact position forming a normally closed rest position of the contactor and a cut-off position driven by a linear actuator (12), the displacement of the movable part driving a movable contact (24) to move, the invention relates to a linear actuator (10) having a movable portion (12), which is separated from opposing fixed contacts (26) in an arc extinguish chamber (22) while compressing a contact pressure spring (28) and a core return spring (30), characterized in that the movable portion is rebounded in order to prevent any rebound during the return of the linear actuator to its rest position. The magnetic effect holding member fixes the movable portion in the contact position before the movable portion rebounds due to the spring action.

The utility model discloses a biological membrane coupled magnetic field reinforced artificial wetland device, which belongs to the technical field of artificial wetlands and comprises a shell, a biological membrane unit, an artificial wetland unit and an adsorption unit which are sequentially arranged in the shell from left to right. A water inlet pipe and a water outlet pipe are formed on the two sides of the shell respectively, a magnetic strengthening assembly is arranged in the constructed wetland unit, and the magnetic strengthening assembly comprises a permanent magnet, an electromagnetic coil and an electromagnetic generator. The device disclosed by the utility model has the beneficial effects that the device is connected to sewage and wastewater to be treated, efficient nitrogen and carbon removal can be realized through the multi-stage effect of cooperative treatment of the biological membrane unit, the constructed wetland unit and the adsorption unit, and meanwhile, the adjustable magnetic field strengthening assembly is arranged in the device, so that the device is more stable and reliable. The growth and metabolism of microorganisms can be promoted through an adjustable magnetic effect, and the pollutant removal efficiency of the system is further improved.

The application discloses a low-noise high-sensitivity micro planar laminated magnetic induction type magnetic sensor, which comprises, from bottom to top, an insulating base, a bottom magnetic film, a combined coil and a top magnetic film; insulating isolation layers are arranged between the combined coil and the bottom magnetic film and the top magnetic film; the bottom magnetic film and the top magnetic film are rectangular planar magnetic films or surface strip grid pattern magnetic films; at least one of the bottom magnetic film and the top magnetic film is a surface strip grid pattern magnetic film; and the combined coil is a double helix coil structure, comprising alternating excitation coils and induction coils. The application not only weakens the demagnetization effect of the surface strip grid pattern magnetic film in the length direction, enhances the effective permeability of the surface strip grid pattern magnetic film in the length direction, but also suppresses eddy current noise, so that low-noise high-sensitivity magnetic field detection is realized.

A kind of design method and sensor of wide-range current sensor based on magnetomotive effect, in the method, magnetomotive body is provided and the magnetomotive body is arranged between energized conductor and magnetic field sensor sensing chip;The magnetic flux density at the position of the magnetic field sensor sensing chip is reduced by the magnetomotive effect of the magnetomotive body, so that the magnetic field sensor sensing chip remains linear response in wide current range, and wide-range current measurement is realized.By the action of high magnetic permeability magnetomotive body, the magnetic flux density at the position of TMR sensing chip is significantly weakened, so that the sensor magnetic saturation phenomenon is effectively delayed.The method significantly widens the current measurement range of the sensor under the premise of maintaining small size, and realizes the breakthrough of traditional TMR current sensor in wide-range measurement field.

The invention provides an axial motor rotor structure, and aims to solve the problems of poor magnetism gathering effect and low magnetic steel utilization rate of an axial motor structure in the prior art. The rotor structure mainly comprises a supporting plate, a plurality of magnetic steel arranged in the circumferential direction and a rotor iron core. The magnetic steel and the rotor iron core are alternately and adjacently arranged to form a closed-loop structure and are fixed to the supporting plate. And the built magnetic flux path adopts a tangential magnetizing mode, so that the magnetic flux of the two adjacent magnetic steels can flow through the rotor core and then converge into an air gap to form a magnetism gathering effect. Through tangential magnetizing and unique magnetic circuit design, the air gap magnetic flux density and the motor salient pole rate are remarkably improved, the magnetic resistance torque is increased, meanwhile, the end magnetic leakage and the rotor loss are effectively reduced, and meanwhile the permanent magnet motor has the advantages of being high in power density, large in torque density, high in efficiency and low in material cost.

The invention provides a magnetic attraction type multistable switching structure and electronic equipment. The magnetic attraction type multistable switching structure comprises at least two fixed magnetic bodies, at least two movable magnetic bodies and at least two movable magnetic bodies, the movable magnetic body is configured to be capable of being kept at a corresponding steady-state position through a magnetic effect when moving to be close to any fixed magnetic body; and the magnetic field sensing device is configured to sense magnetic field states of the movable magnetic body at different steady-state positions and output a detection signal. According to the invention, different steady-state positions of the movable magnetic body can be accurately distinguished, and accurate identification of the state or the spatial position is realized.

The invention discloses nano magnetic powder with high dispersity and uniform particle size and a preparation method of the nano magnetic powder, and belongs to the technical field of powder material preparation and treatment. According to the invention, the dispersion medium, the dispersing agent and the wetting agent are added into the nano magnetic powder, so that efficient dispersion of the nano magnetic powder can be realized; meanwhile, the ultrahigh-pressure jet flow homogenization treatment is combined, so that soft aggregates can be thoroughly crushed, and the nano magnetic powder is monodispersed; besides, after the coating agent is used for coating, the magnetic effect can be weakened, secondary agglomeration can be prevented, and the stability of the coating slurry and the nano magnetic powder is remarkably improved; the particle size distribution of the powder can be accurately regulated and controlled by further adopting rotational flow grading treatment, and the nano magnetic powder with uniform particle size distribution is obtained; and the whole preparation process flow realizes integration of dispersing, coating, grading and drying, the process flow system is complete, parameters are easy to control, the method is suitable for large-scale continuous production, and the product performance is stable and reliable.

The invention belongs to the technical field of solid waste treatment and resource utilization, and relates to a kitchen biogas residue micro-plastic deep separation method based on in-situ biological membrane stripping and hydrophobic magnetic induction. Comprising the following steps: adding an EPS deconstruction compound enzyme preparation and a cationic chelating agent into kitchen biogas residues subjected to anaerobic digestion, and carrying out ultrasonic treatment to strip a biological membrane on the surface of micro-plastic so as to obtain biogas residue slurry; the EPS deconstruction compound enzyme preparation is prepared from protease, alpha-amylase and cellulase; fully mixing super-hydrophobic magnetic nanoparticles with the biogas residue slurry, and then carrying out magnetic separation; the super-hydrophobic magnetic nanoparticles are magnetic nanoparticles of which the surfaces are modified with hydrophobic groups. According to the method provided by the invention, through a chemical-physical synergistic effect, efficient stripping of a biological membrane on the surface of the micro-plastic is realized, the micro-plastic is accurately captured in a targeted manner by utilizing a hydrophobic magnetic effect, meanwhile, the dehydration performance of the biogas residues is improved, and synergistic interaction of removal of the micro-plastic and recycling of the biogas residues is realized.

A high power density coupled magnetic element and coupled magnetic module with low DC resistance are provided, which can achieve a high power density, low loss coupled magnetic effect. [Solution] The coupled magnetic element 1A includes a first iron core 11, an external coil 13, an internal coil 14, and a second iron core 12. The first iron core has a cover body 111 and an iron core post 112, and the cover body has a first storage chamber S1, and the iron core post is located within the first storage chamber. The external coil is located within the first storage chamber and has a storage space S3. The internal coil is removably located within the storage space and has an arrangement space S4 for storing the iron core post. The second iron core is removably coupled horizontally to the first iron core to form a partition, and the external coil, internal coil, and iron core post are located within the partition.

A magnetic implant device (1), which provides analgesic effects by increasing nitric oxide synthesis using pulsed magnetic field effects, accelerates the fusion of an implant with a bone and eliminates the negative effects of foreign bodies within the tissue, comprising: at least one coil (2) generating pulsed magnetic field effects; a control unit (7), which accelerates the bonding of the dental implant to the bone by means of the magnetic effect generated by said coil (2), allowing a change in the electromagnetic field strength of the generated pulsed magnetic field, and which has an adjustment button to adjust the frequency and power of the magnetic implant device (1), and a switch button to open and close the device, an applicator (9), which is adapted to the form of the jaw bone, the device can be used for treating all teeth of the upper and lower jaws, and provides uniform pulse electromagnetic effect for the application area of the device.

The utility model discloses an anti-drop and anti-vibration continuous casting machine dummy ingot structure, which relates to the technical field of continuous casting machines and comprises a dummy bar body, a storage frame and a storage groove, the storage frame is arranged on the outer side of the dummy bar body, the storage groove is formed in the storage frame, and the dummy bar body is inserted into the storage groove formed in the storage frame in a penetrating manner. According to the anti-falling and anti-vibration continuous casting machine dummy ingot structure, limiting, taking and placing of the dummy bar body can be completed through the magnetic effect, the dummy bar body can be effectively prevented from sliding down from the interior of the storage groove due to the vibration effect, the stability during storage is higher, the driving motor is adopted to control overturning of the magnetic attraction block, operation is faster, and the service life of the dummy bar body is prolonged. According to the anti-falling and anti-vibration dummy bar structure of the continuous casting machine, the problem that when an existing dummy bar structure stores dummy bars, the dummy bars are mostly clamped on a storage frame, and the storage stability is poor is solved.

The invention discloses a design method of a differential compensation electromagnetic metamaterial array, and belongs to the technical field of artificial electromagnetic materials. Firstly, basic structure parameters of the electromagnetic metamaterial are calculated according to a selected structure and resonance frequency, element simulation is carried out in Maxwell to obtain self-inductance of the electromagnetic metamaterial, and differential capacitance compensation is carried out according to the electromagnetic effect of elements. According to the invention, the low-frequency electromagnetic metamaterial is introduced into the magnetic coupling resonant wireless power transmission system, and through a differential compensation strategy, the overall resonant frequency deviation of the array is effectively suppressed, so that the system stably works at a target frequency and shows a stable negative magnetic conductivity characteristic; the problems of low transmission efficiency and poor stability under low frequency caused by coupling change between coils are solved.

A tracked external rotor magnetic motor utilizing axial closed-circuit and open-circuit magnetic fields is disclosed. An axially magnetized annular planetary permanent magnet attracts the inner edge of a pressure-bearing elliptical steel track, creating two radial magnetic potential angles on the upper and lower sides of the track's inner edge. At the lower angle, the side poles of the annular permanent magnet are attracted by opposite-pole permanent magnets, resulting in a closed magnetic field that eliminates the magnetic force on the track, causing it to follow the magnet's movement. At the upper angle, the side poles of the annular permanent magnet have an open magnetic field, causing the permanent magnet roller to rotate under the radial magnetic potential, driving the output gear ring wheel. This closed-circuit magnetic effect forms the rotational cycle. This device not only increases the output power density but also compensates for the high friction, power loss, and noise associated with planetary rotation mechanisms. It can be widely applied in transportation, energy construction, energy conservation, and environmental protection. Its simple mechanical structure and manufacturing process make it valuable for broad industrial and commercial applications.

The application discloses an image-based electron beam magnetic effect correction method and system, and the method comprises the following steps: dividing a wafer along the X-axis and Y-axis directions into regions with a fixed interval distance; scanning a rectangular mark array on the surface of the region position to obtain a rectangular mark array image of the region position scanning field; calculating the barycentric position, width, height and rotation angle value of all marks in the region position scanning field through the rectangular mark array image; calculating the distortion coefficient of the region position scanning field through the barycentric position of the marks, correcting the distortion coefficient to obtain the width, height and rotation angle value of the corrected marks, and then obtaining the electron beam magnetic effect correction value of the region position scanning field; and according to the position of the exposure pattern on the wafer, the electron beam magnetic effect correction value of the adjacent region position scanning field is inquired to obtain the electron beam magnetic effect compensation value of the region position. The application is simple, easy to operate and high in correction precision.

The invention discloses a magnetic field distortion correction method for a double-shaft excitation synchronous generator under a short-circuit working condition, and the method comprises the steps: obtaining the d-axis magnetic field intensity of a rotor during the normal operation of the generator through a magnetic field analysis means, and building a magnetic field distribution reference; when the generator has a short-circuit fault, monitoring a d-axis flux density change, and identifying a flux density reduction area through the magnetic field cloud picture; on the basis of the flux density reduction area, q-axis exciting current is connected to enhance the d-axis flux density, and the demagnetizing effect caused by armature reaction is counteracted; by adjusting q-axis exciting current, the distortion rate of magnetic induction lines is reduced; the method aims at accurately identifying a d-axis flux density reduction area caused by short circuit through a closed-loop process of reference establishment, distortion identification, accurate correction and optimization verification, specifically counteracting an armature reaction demagnetizing effect by using q-axis exciting current, reducing the distortion rate of magnetic induction lines, and improving the magnetic flux density reduction rate. The problems of poor correction pertinence and easy magnetic circuit saturation in the prior art are solved, and the short-circuit endurance capability of the generator and the stability of a power system are improved.

The application provides a method for regulating the precipitation position of iron-rich intermetallic compounds by using a magnetic field, and belongs to the technical field of material solidification and magnetic field application. The method comprises the following steps: melting an iron-rich alloy ingot and then rotating and solidifying the alloy ingot horizontally under a magnetic field. In the alloy solidification process, a magnetic field is applied, the thermal electromagnetic effect of the magnetic field is utilized to regulate the precipitation position of the iron-rich intermetallic compounds, after the magnetic field is applied, the iron-rich intermetallic compounds are only formed and grown on the oxide film at the edge of the alloy, and the intermetallic compounds formed on the surrounding oxide film can continuously obtain the solute required for growth and growth, which also leads to a low solute concentration in the center of the alloy, and the center of the alloy is basically free of intermetallic compound formation.

This invention provides a self-triggered reinforcement structure and method for coral sand foundations under seismic loading. The structure includes a shell, a core, an induction excitation system, an oil-secreting module, and a pressure spraying system. The core is located inside the shell cavity and a weak magnet is fixed on it. The induction excitation system includes a MEMS accelerometer chip, a Hall effect chip, and an iron core. A coil is mounted on the iron core. The MEMS accelerometer chip and the Hall effect chip are used to monitor the seismic magnetic effect and acceleration variations. When the seismic magnetic effect occurs and the acceleration exceeds a threshold, the coil and the iron core become electromagnets with the same polarity as the weak magnet, and the core is inserted into the soil for reinforcement. The oil-secreting module is used to reduce the friction between the core and the shell, and the pressure spraying system is used to cause the reinforcement grout inside the shell to overflow for reinforcement. This invention can monitor the dynamic load state in real time. Through the self-triggered core structure in the pressure spraying system and induction excitation system, the surrounding soil of the reinforced structure is actively grouted and reinforced to form a vertical reinforcement structure.

The invention discloses magnetic temperature-sensitive intelligent hydrogel and a preparation method thereof, and belongs to the field of intelligent hydrogel preparation. The preparation method comprises the following steps: firstly, adding an alginic acid aqueous solution into a CaCl2 aqueous solution to prepare spherical gel; sequentially adding the spherical gel into an acrylamide monomer solution and a nitrogen isopropylacrylamide monomer solution, and carrying out a polymerization reaction, so as to obtain temperature-sensitive gel; and then soaking and reacting the temperature-sensitive gel in a solution of Fe < 2 + >: Fe < 3 + > in a ratio of 1: 2, taking out the temperature-sensitive gel, and immediately soaking and reacting the temperature-sensitive gel in a NaOH solution to prepare the intelligent hydrogel with magnetism and temperature sensitivity. The magnetic temperature-sensitive intelligent hydrogel prepared by the method has better biocompatibility, the critical transition temperature and the zero charge point pH are very close to those of a human body, and magnetic particles are very uniformly distributed in a gel network, so that the prepared gel has better magnetic effect, and the application prospect of the gel in the field of biomedicine is increased.

The present disclosure belongs to the technical field of tunnel and underground engineering grouting, and particularly relates to a magnetic fluid grouting system capable of actively guiding the diffusion direction of slurry and a working method thereof, which comprises a slurry preparation unit, a pumping unit, a slurry injection pipeline, a slurry leading pipeline and a slurry diffusion guiding unit; the slurry preparation unit comprises a slurry raw material storage and a slurry mixer; the pumping unit adopts a grouting pump and a high-pressure-resistant grouting hose; the slurry injection pipeline adopts a galvanized degaussing steel pipe; the slurry leading pipeline adopts a galvanized degaussing steel pipe, which provides a migration channel for the led magnetic fluid slurry and verifies the slurry diffusion range; the slurry diffusion guiding unit comprises a power supply box, a circuit controller, a negative pressure liquid pumping pump, a backflow slurry storage tank and a magnetic yoke structure arranged at the front end of the galvanized degaussing steel pipe in the slurry leading pipeline; the slurry diffusion guiding unit is used for controlling the start and stop of electromagnetic effect in the magnetic yoke, regulating and controlling the electromagnetic force, and providing a negative pressure environment for the slurry leading pipeline.

Article transfer device (100) that transfers articles, wherein the article transfer device (100) comprises: a guide rail (110) arranged along a predetermined path; primary-side stators (120) arranged along the predetermined path; a first transport carriage (210) and a second transport carriage (220), each comprising a secondary-side movable element (211) and transporting an article by traveling on the guide rail (110) by the secondary-side movable element (211) receiving a magnetic effect from the primary-side stators (120); a power source (130) arranged on the predetermined path; and a controller (300) that controls the operation of a floor-level primary-side linear motor system, wherein the floor-level primary-side linear motor system comprises the primary-side stators (120) and the secondary-side moving element (211), wherein the first transport carriage (210) and the second transport carriage (220) each are caused by the ground-level primary-side linear motor system to move in such a way that they can be individually stopped or change their travel speed, and Furthermore, each includes a transfer unit (212) which, by receiving force from the power source (130), transfers the article in an overlapping direction that intersects with the predetermined path, wherein the guide rail (110) comprises a second transfer section which runs parallel to a second transport track (440) of a second transport device which transports the article, wherein the guide rail (110) and the second transport track (440) are arranged in a horizontal direction relative to each other, wherein the second transfer section is a section in which the article is transferred to and from the second transport device, and wherein the control (300) causes the article to be transferred by the transfer unit (212) in a state in which the first transport carriage (210) and the second transport carriage (220) are each brought to travel at a speed that is synchronous with a transport speed of the second transport device in the second transfer section.

This invention discloses a permanent magnet hysteresis self-starting motor, belonging to the field of self-starting motor manufacturing. The self-starting motor comprises a permanent magnet hysteresis rotor and a stator, which are composed of a permanent magnet and a hysteresis ring, arranged from the inside out, with a single-layer air gap between the rotor and stator. The rotor includes a hysteresis ring made of hysteresis material, a conventional permanent magnet, and a core material made of soft magnetic material. The hysteresis ring is disposed on the outer surface of the rotor, providing the starting torque required during motor self-starting and participating in providing the main magnetic field in steady state. The permanent magnet is embedded in the hysteresis ring to achieve a magnetic focusing effect, thereby enhancing the torque output capability in steady state. The rotor core is placed at the bottom of the hysteresis ring, providing a path for the tangential magnetic flux of the motor. The stator includes a stator core and three-phase windings, with the windings distributed and wound around the stator core. This invention's permanent magnet hysteresis self-starting motor can reduce the current during startup while ensuring starting capability and improving motor efficiency in steady state.

The utility model discloses a kind of planar transformer and electronic equipment, it is related to planar transformer technical field.The planar transformer includes magnetic block, two magnetic cores and two PCB boards, magnetic core includes horizontal strip, middle column and two edge columns, middle column and two edge columns are all arranged in the surface of horizontal strip, and two edge columns are one-to-one corresponding and arranged on the opposite sides of middle column, PCB board is provided with mounting hole, the middle column of two magnetic cores is one-to-one corresponding and arranged in the mounting hole of two PCB boards, two magnetic cores cooperate with each other, and two PCB boards are spaced apart, magnetic block is detachably installed between two PCB boards.When the leakage inductance of the planar transformer needs to be adjusted, different size magnetic blocks are replaced, and the magnetic blocks are detachably installed between the two PCB boards, the magnetic effect inside the planar transformer is changed, so that the leakage inductance of the planar transformer can be adjusted.

The utility model relates to the technical field of digital electrical logging instruments, and discloses an electrical prospecting digital electrical logging instrument based on a capacitance method, which comprises an electrical logging instrument host and an electrical logging base station arranged on the outer side of the electrical logging instrument host, and a magnetic electrode is arranged on the outer side of the electrical logging base station. According to the utility model, in the collection of electrical prospecting data, electrical equipment comprises a YBD11 network parallel electrical prospecting instrument, a YBT32 audio scenograph and a YBT96 mining AC / DC parallel electrical prospecting instrument. The electrical methods cover an electrical method field wiring diagram commonly used by electrical method advanced detection, electrical method top and bottom plate detection and working face electrical perspective; according to analysis from the perspective of circuit theory, the change of the voltage and the distance is inevitably related to at least one of the heat effect, the magnetic effect and the electric field effect, and at the moment, people only need to research three effect curve characteristics and actually measured curve characteristics of the circuit and analyze which effect curve in the three effect curve characteristics most conforms to the actually measured curve characteristics.

The invention relates to the technical field of magnetic therapy equipment design, and discloses a magnetic circuit analysis method of a permanent magnetic field sleep magnetic therapy instrument, which comprises the steps of stimulation mode design, static magnetic circuit working point selection, self-demagnetization effect guide design and finite element simulation verification, in static magnetic circuit working point selection, a load line is constructed through demagnetization curve feature points, the maximum magnetic energy product point is determined, and the working point coordinate ratio is corrected; in self-demagnetization effect guiding design, a closed magnetic circuit structure is adopted; reverse compensation magnetic ring installation and magnetic domain stabilization processing are carried out; a magnetic therapy instrument and human tissue coupling model is constructed through finite element simulation verification; and the four parts are executed in sequence and mutually linked to form a closed loop. The method solves the problems that a traditional magnetic circuit is low in magnetic energy utilization rate, large in self-demagnetization influence and the like, magnetic field accurate focusing and magnetic circuit stable operation are achieved, and the sleep treatment requirement is met.

The present application relates to the technical field of magnetic encoder, especially to a causal inference compensation system and method for residual magnetism effect of magnetic encoder, comprising three anisotropic magnetoresistive sensors arranged uniformly along the circumference of the gear, a signal processing module, a topological dynamics model unit, a multi-step delay processing unit, a reverse factor reasoning unit and a compensation output unit, the present application maps the magnetic sensing data to a three-dimensional Riemann manifold, constructs a tangent space dynamics representation, and establishes a G-VAR model based on the topological structure of the manifold; a conditional probability measure space is constructed by multi-step delay coordinate embedding to identify the invariant measure and attractor structure of the system; reverse trajectory tracking analysis is performed based on chaos theory to separate the residual magnetism effect component; compensation data is generated to modify the output signal of the magnetic encoder, the present application can effectively capture the nonlinear dynamic characteristics of the residual magnetism effect, accurately model and compensate, and greatly improve the angle measurement accuracy.