93 results about "Magnetic source" patented technology

The invention discloses a magnetic source target positioning method, which belongs to the technical field of geophysical exploration, is used for positioning a magnetic source target, and comprises the following steps: collecting and preprocessing plane grid magnetic anomaly data, constructing a simplified Euler deconvolution model under the constraint of derivative features, segmenting observation data by using a local sliding window, and resolving to generate an Euler solution point cloud. The method comprises the following steps: converting a selection problem of an equivalent scale factor into a one-dimensional global optimization problem, adaptively searching an optimal solution through a Bayesian optimization method, identifying a magnetic source high-probability solution point and a noise solution point by using a density-based spatial clustering method, introducing a density penalty term to strengthen a high-probability solution constraint, and constructing a final positioning target function. And outputting the optimal position solution of the magnetic source. According to the method, a traditional Euler deconvolution model is simplified, noise interference is effectively suppressed, the stability and robustness of the inversion process are improved, uncertainty caused by manual parameter selection is avoided, and the positioning precision is improved.

This application provides a displacement sensor and a magnetic levitation system. The magnetic levitation system includes a magnetic levitation bearing and a displacement sensor. The displacement sensor includes: a first magnetic source mounted on the rotor shaft of the magnetic levitation bearing, used to generate a magnetic field; a substrate fixedly disposed at a distance from the first magnetic source, with a central hole for the rotor shaft to pass through; and a Hall array including multiple Hall chips, each attached to and electrically connected to the substrate. The Hall chips are distributed around the central hole, and each Hall chip can detect the magnetic flux density at its respective location to obtain position information of the first magnetic source and the rotor shaft. Compared to traditional magnetic levitation bearings, this application uses fewer displacement sensors, thus reducing the installation space occupied by the displacement sensors. It is also suitable for applications where the rotor shaft is extended.

The magnetic liquid sealing device of the present application belongs to the field of mechanical engineering sealing. The device is composed of the following components: main shaft, magnetic liquid I, pole shoe ring I, shell, sealing ring I, pump I, container I, sealing ring II, electromagnet I, magnetic conducting sleeve, electromagnet II, pump II, container II, sealing ring III, pole shoe ring II, magnetic liquid II, sealing ring IV, end cover. The sealing device composed of these components is a module that can be used in stack. Two kinds of magnetic liquids are used alternately or simultaneously, which expands the applicable temperature range of the magnetic liquid sealing. The sealing device is modularized, and different types of magnetic liquids can be used in different modules to have different applicable temperature ranges. The magnetic liquid sealing can be used in a wide temperature range by connecting the modules in series. The electromagnet is used as the magnetic source, and according to different working temperatures, the state of each magnetic liquid sealing can be independently controlled through cooperation with the pump to prevent permanent failure of the magnetic liquid due to temperature problems.

The invention discloses a cargo in-vitro magnetic field calculation method based on boundary magnetic field numerical integration, which relates to the technical field of electromagnetic detection, and comprises the following steps: constructing a cargo numerical model in finite element electromagnetic field calculation software, and setting the size of the cargo numerical model; determining the position of an initial magnetic source based on the cargo numerical model, and setting the intensity of the initial magnetic source; respectively calculating magnetic field intensities at positions 2.1 m and 4.6 m away from the initial magnetic source intensity through finite element electromagnetic field calculation software to obtain spatial magnetic field data, further obtaining attenuation coefficients of transverse unit detection points of all boundary planes, obtaining an attenuation coefficient set, and performing spatial interpolation and translation processing; coupling each actually measured magnetic field data acquired by the array sensor with attenuation coefficients at corresponding positions, and respectively solving magnetic field intensities at positions 2.1 m and 4.6 m away from the surface of a measured object; high-precision and high-efficiency calculation of the external magnetic field of the cargo is realized, and the rapid and lossless requirements of air transportation safety detection are met.

This invention provides an indoor magnetic navigation verification system and its operating method. The system includes an experimental platform, an optical positioning system, and a display terminal. The experimental platform, from bottom to top, comprises a support layer, a magnetic source deployment layer, a scene support layer, and a carrier operation layer. The magnetic source deployment layer contains a magnetic source array capable of receiving magnetic source control signals sent by a host computer. The magnetic source array includes multiple magnetic sources. A mobile carrier runs on the carrier operation layer. An edge computer acquires the motion data of the mobile carrier and outputs it to the host computer, which calculates the estimated trajectory of the mobile carrier. The optical positioning system includes multiple camera devices for acquiring the actual trajectory of the mobile carrier. The display terminal acquires the actual trajectory output by the optical positioning system and compares and displays the estimated trajectory with the actual trajectory. This invention also provides the operating method of the system. This invention can construct a verification system that can be repeatedly verified.

The invention provides an intraoperative dynamic positioning system and method based on a magnetic sensor array and a composite magnetic field, and the system comprises a composite excitation handle which is internally and non-coaxially integrated with a static magnetic source and a dynamic magnetic source, and generates a non-axisymmetric static and dynamic composite magnetic field; the self-adaptive sensing array is provided with a plurality of magnetic sensing nodes and is used for synchronously acquiring magnetic field signals; and the navigation processing terminal is used for processing the signal and resolving the pose. According to the method, static magnetic and dynamic magnetic components are obtained through synchronous acquisition and frequency domain decoupling; the method comprises the following steps: fitting the position and direction of a handle by utilizing a static magnetic component, and solving a rotation angle around a shaft by taking the position and direction as initial values and combining a dynamic magnetic component to realize full six-degree-of-freedom positioning; and finally, obtaining the navigation pose of the instrument tip through filtering mapping. According to the invention, full-attitude, high-precision and strong-interference-resistance intraoperative dynamic positioning is realized, and the problems of precision degradation and visual lag of traditional electromagnetic positioning in a metal environment are solved.

The invention discloses a multi-stage purification magnetic polishing sewage filtering treatment device which comprises a filtering tank, the top of the filtering tank is sleeved with a tank cover, the top of the tank cover communicates with two liquid inlet pipes, the tops of the two liquid inlet pipes communicate with a liquid inlet frame, and a filter screen is fixedly installed in the top of the liquid inlet frame; a magnetic suction overflow assembly is mounted in the filtering tank, and a grading filtering assembly is mounted in the filtering tank; magnetic force loss substances and metal scraps in sewage can be magnetically attracted through the magnetic force grid plates and the magnetic force rings, the magnetic force grid plates adopt high-magnetic-energy-product permanent magnets arranged in an array mode as magnetic sources, gaps between the grid plates are optimally designed through fluid mechanics, it is guaranteed that the sewage can smoothly pass through, and the magnetic force loss substances and the metal scraps are prevented from being damaged. The magnetic rings are distributed in a concentric circle mode, the magnetic rings and a magnetic field formed by the magnetic grid plates are mutually overlapped, a three-dimensional interception type magnetic field space is constructed, and metal magnetic pollutants are preferentially removed through the magnetic separation technology.

This invention discloses a method and system for anomaly assessment of the magnetic field of a UAV. The method includes: acquiring magnetic field measurement data of the UAV through a three-axis fluxgate sensor array; estimating the number of magnetic dipoles and spatial orientation boundaries based on the UAV's structural design information; constructing magnetic dipole range constraints based on the number of magnetic dipoles and spatial orientation boundaries; obtaining the optimal magnetic dipole parameter set based on the magnetic dipole range constraints using a genetic algorithm; embedding the optimal magnetic dipole parameter set into a magnetic field calculation model; obtaining a magnetic field intensity distribution cloud map and a closed surface with isomagnetic induction intensity of the UAV's own magnetic field under a specific scenario through the magnetic field calculation model; and performing anomaly assessment of the UAV's own magnetic field based on the magnetic field intensity distribution cloud map and the closed surface. This invention improves the determinism of the inversion results by designing a constraint strategy based on the distribution characteristics of the UAV's own magnetic source and embedding it into a genetic algorithm, thereby achieving high-precision anomaly assessment of the magnetic field.

The invention discloses a double-magnetic-source signal generating device and a drill bit orientation verification device and method, and relates to the technical field of drilling, and the double-magnetic-source signal generating device comprises a drill bit, a lower magnetic connector, a bent screw drill, an upper magnetic connector, a non-magnetic drill collar and a drill pipe column which are sequentially connected end to end; the driving device is arranged on the ground surface, is connected with the drill pipe column and is used for driving the drill pipe column to drive the upper magnetic connector and the non-magnetic drill collar to rotate at a first rotating speed, and the upper magnetic connector generates a low-speed magnetic line of force; the earth surface slurry pump circularly drives the rotor of the bent screw drill to rotate at a second rotating speed, the output shaft of the bent screw drill drives the lower magnetic connector and the drill bit to rotate at a third rotating speed, and the lower magnetic connector generates a rapid magnetic line of force; wherein the third rotating speed is the sum of the first rotating speed and the second rotating speed. The azimuth angle of the drill bit can be verified, and accurate butt joint of the drill bit of the directional well relative to the target position is ensured.

The invention relates to the technical field of high-pressure valves, in particular to a low-power-consumption bistable electromagnetic actuator for a valve, which comprises a casing main body for accommodating other parts of the electromagnetic actuator, introducing a control wire and allowing an output component to penetrate out; the stator assembly comprises annular coil devices which are symmetrically arranged in the axial direction and generate armature magnetic flux to control an output component to move transversely, and control wiring to control the time sequence of the armature magnetic flux generated by the coil devices. The middle iron core assembly comprises a permanent magnet device capable of generating permanent magnetic flux, and the permanent magnet device is located in the symmetrical middle of the symmetrically-arranged annular coil device and used for conducting electromagnetic fixing on the output component after transverse movement is finished. The armature assembly is used for driving the output component to retract into or penetrate out of the machine shell body under the action of armature magnetic flux to execute valve switch control action, and the armature assembly is arranged in the stator assembly and penetrates through the middle iron core assembly. According to the invention, a novel composite magnetic circuit under the dual action of a constant magnetic source and an electromagnetic field is constructed, so that bidirectional active switching between steady-state positions is realized.

The utility model provides a fresh-keeping storage container and refrigeration equipment, and the fresh-keeping storage container comprises a drawer which is used for storing stored objects; the cover shell is arranged on the top of the drawer so as to cover the inner space of the drawer; the magnetic source part is arranged on the side, facing the drawer, of the cover shell and used for generating a magnetic field in the inner space of the drawer; the fixing shell is arranged on the side, away from the cover shell, of the magnetic source part, and the fixing shell is fixedly connected with the cover shell so as to clamp and fix the magnetic source part together with the cover shell. In the storage process, the magnetic source part is located above the inner space of the drawer, and the magnetic field generated by the magnetic source part can act on the stored objects in the drawer, so that the magnetic field fresh-keeping effect is achieved, and the fresh-keeping effect of the food materials is improved.

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

A magnetic field-assisted additive manufacturing (MFAAM) system and method for fabricating anisotropic bonded magnets. The system includes a magnetic field source assembly including a modular Halbach holder, an inner Halbach holder, and a Halbach cylinder configured to provide a magnetic field for aligning magnetic fillers within a polymer matrix during extrusion. The field gradient of the Halbach cylinder is less than 0.0005 T / mm allowing to obtain high print quality in a large magnetic field. To enable high-temperature processing, the assembly incorporates a cooling casing fluidly coupled to a cooling medium. This active thermal management maintains the Halbach cylinder below a threshold temperature while a heated nozzle extrudes the composite material at temperatures sufficient to melt high-performance polymers. The integration of the magnetic source and cooling jacket allows for the precise alignment of magnetic domains in high-viscosity matrices, resulting in 3D-printed bonded magnets with consistent magnetic anisotropy and improved structural properties.

A method for determining the position (x; x, y) of a sensor device movable relative to a magnetic source, or a magnetic source movable relative to the sensor device; the sensor device comprising at least two magnetic sensors; the method comprising the steps of: a) obtaining a plurality of magnetic sensor signals from the magnetic sensors; b) determining or estimating the position of the sensor device based on the plurality of sensor signals or signals derived therefrom; wherein step b) comprises: determining the position (x; x, y) using an artificial neural network; the artificial neural network being a recurrent neural network trained using up to three hundred trainable parameters per degree of freedom to determine the position. Position sensor system. Position sensor device.

The present application belongs to the technical field of submarine pipeline laying, and particularly relates to a high-precision butt joint method, system and equipment for submarine pipeline laying under rocks, aiming to solve the problem that the accurate butt joint construction of the existing submarine directional drilling crossing technology can only be carried out in the horizontal direction of land or the crossing drilling between land and land. The present application comprises the following steps: through a sea drilling ship, a positioning drill bit carrying a magnetic source beacon is made to drill down through a drill rod in the butt joint sea area, a guide source is set, the first butt joint drilling tool is guided to drill to a preset butt joint area and the through position is recorded through the guide source, the first butt joint drilling tool is retracted, the second butt joint drilling tool is guided to the through position through the guide source, and directional drilling is completed. The present application enables the horizontal directional drilling construction based on magnetic source positioning to carry out rock butt joint operation in any sea area where offshore drilling operation can be carried out, and solves the problem that the butt joint in rocks between the ocean and islands can only be carried out in one-way operation.

The application discloses a transformer core intelligent stacking method based on magnetic flux leakage pole minimization optimization, and belongs to the technical field of transformer manufacturing. The method comprises the following steps: in response to a silicon steel sheet to be placed entering a stacking station, generating a background excitation magnetic field based on an excitation magnetic source in the stacking station; monitoring the spatial magnetic flux leakage distribution introduced by the silicon steel sheet in real time through a sensor array; based on the spatial magnetic flux leakage distribution, iteratively calculating an optimal placement pose through an optimization algorithm, the optimal placement pose corresponding to a minimum point of the spatial magnetic flux leakage distribution; and driving a mechanical arm to place the silicon steel sheet at the optimal placement pose. The application constructs a closed-loop feedback with actual magnetic physical quantities as the target, replaces the traditional open-loop control based on geometric alignment, and directly guides the assembly with the final electromagnetic performance, thereby significantly reducing the magnetic resistance and iron loss of the finished product core.

Provided are systems, cartridges, devices and methods for detecting a target analyte in a test sample. The system employs a multitude of magnetic sources for moving magnetic beads in a sequential movement through various portions of e.g. a cartridge or strip, such as from one or more hybridization portions, through one or more washing portions, and to a redox portion. The system employs an electrode set and a potentiostat for performing amperometry to obtain an electrochemical measurement based on conversion of a redox active molecule. Also provided are methods for detecting a target analyte using the systems, and cartridges and strips for use in the system or a device of the system.

This invention relates to a method for correcting system errors in a full-tensor magnetic gradient system based on position information, comprising the following steps: acquiring full-tensor magnetic gradient measurement data obtained by a full-tensor magnetic gradient measuring device from the detection of a target magnetic source at different relative positions, and magnetic source reference position data obtained by a position sensor; establishing a magnetic source position model including installation error parameters based on a full-tensor invariant magnetic target localization algorithm; inputting the full-tensor magnetic gradient measurement data into the magnetic source position model, and solving for the installation error parameter value that minimizes the error between the magnetic source position model and the corresponding magnetic source reference position data; and using the installation error parameter value to correct the system error of the full-tensor magnetic gradient measuring device. This method enables high-precision correction of the full-tensor magnetic gradient system, with low hardware cost and a simple and easy-to-implement calibration process.

The invention discloses a passive measurement type magnetic navigation system and method based on magnetic source imaging, and belongs to the technical field of medical equipment. The system comprises a sensor array for detecting and feeding back magnetic field changes in an environment; the magnetic sensor array adopts a modular expansion design, a detection curved surface is formed by a plurality of magnetic sensing units, and each magnetic sensing unit comprises a planar substrate, a magnetic sensor chip and a slave MCU assembly; the adjacent magnetic sensing units are connected through the adjustable connecting mechanisms, and the included angle between the adjustable connecting mechanisms can be flexibly adjusted and locked within a certain range, so that the whole magnetic sensor array is adaptive to detection surfaces with different curvatures; the overall structure supports modular expansion, the number of the magnetic sensing units is increased or decreased according to actual detection requirements, and detection arrays of different scales and shapes are flexibly constructed; according to the invention, an accurate magnetic dipole model and a high-robustness pose resolving method are established, and millimeter-level and real-time three-dimensional tracking of the surgical instrument is realized.

The application provides a heat-conducting heat insulation device for an atomic brain magnetometer probe. The device combines the characteristics of brain magnetic measurement, and a heat-conducting layer made of non-magnetic high-thermal-conductivity material is clamped in the heat insulation layer of the skin contact surface of the brain magnetometer probe, and the heat-conducting layer is communicated to a heat dissipation shell arranged at the non-contact surface of the skin. Through the above structural design, while ensuring the high-temperature requirement of the atomic bubble inside the atomic brain magnetometer probe, most of the total heat flow transmitted from the internal high-temperature area to the human body is transmitted to the heat dissipation shell through the heat-conducting layer, so as to reduce the heat transmission to the human body, so that the atomic brain magnetometer probe can meet the skin contact safety temperature requirement of the medical electrical equipment, the distance between the atomic bubble and the brain magnetic source can be shortened, the attenuation of the brain magnetic signal is reduced, and the precise detection of the weak brain magnetic signal is of great significance.

The application discloses a borehole time domain electromagnetic far detection device and method, which comprises a ground system, an armored cable, a remote transmission system and a time domain electromagnetic logging instrument; the remote transmission system is connected with the time domain electromagnetic logging instrument and is arranged in a borehole; the time domain electromagnetic logging instrument comprises an electronic circuit, an acquisition module and a transmission module which are sequentially arranged from top to bottom; the electronic circuit is connected with the acquisition module and the transmission module for detection; the acquisition module comprises a first array type three-component magnetic receiving sensor, a second array type three-component magnetic receiving sensor, an electric receiving sensor, a third array type three-component magnetic receiving sensor and a fourth array type three-component magnetic receiving sensor which are sequentially arranged from top to bottom; and the transmission module comprises a magnetic source and an electric source which are sequentially arranged from top to bottom. The time domain magnetic and electric hybrid transmission source is adopted for transmission, the array type magnetic sensor is adopted for reception and the electric sensor is adopted for reception, so that the source distance of the detector is shortened, and the borehole far detection is realized.

The invention discloses a pose estimation method and device of a magnetic control capsule and a computer program product in the technical field of magnetic micro-robot positioning, and aims to solve the problem that the pose estimation method is weak in multi-magnetic-source coupling processing capacity or lacks physical constraints. The method comprises the following steps of: processing three kinds of physical parameters, namely a three-axis magnetic field component, coordinates of magnetic sensors and a distance between the magnetic sensors; according to the obtained physical feature data packet, feature extraction is carried out on the most root physical parameters from the data of one-dimensional independent magnetic sensors, the data change between two-dimensional magnetic sensors and the three-dimensional magnetic field vector angle, and only after the features are analyzed and classified according to the geometric space angle, the feature extraction is carried out. The data is used for prediction by the pose residual neural network, so that pose prediction data with physical consistency can be output; pose estimation is carried out based on the pose residual neural network and the magnetic sensor array, the multi-magnetic-source coupling processing capacity is high, and the requirement for accurate positioning in the complex magnetic environment is met.

The invention provides a multi-magnetic-source initial positioning method, device and system based on NSS-VMGT fusion, and solves the problems of misjudgment of the number of magnetic sources, missing detection of edge magnets and low actuarial efficiency in the prior art. The method comprises the following steps of: acquiring 7 * 7 three-component sensor array data by an information processing module, and preprocessing by moving average filtering; deriving a magnetic field space change rate through an MGT module, and solving a related angle and an X / Y direction gradient in combination with a VMGT module; the NSS module detects a magnetic gradient tensor feature value and eliminates a coupling pseudo peak, the candidate point recognition module extracts internal candidate points and delimits an initial search area, and the candidate point fusion module detects edge candidate points and performs merging and duplicate removal. The device is based on an STM32H743 hardware platform and comprises a 7 * 7 array positioning plate, a double-MCU regional acquisition framework, a serial port data interaction link and a hardware signal filtering and voltage stabilizing circuit. According to the design, the recognition accuracy of the number of the magnetic sources is improved to 94%, and the scene requirements of multi-magnetic capsule targeted therapy and the like are met.

A sensor system (100) comprising: a magnetic source having a through opening; a magnetic sensor positioned at a fixed position relative to the magnetic source; an object capable of influencing the magnetic field generated by the magnetic source, the object being movable relative to the magnetic source and being positioned completely outside the through opening; a processing circuit configured to provide a signal indicative of the presence, position or orientation of the movable object, or a value derived therefrom; wherein a minimum distance (sd1) between the movable object and the magnetic source is less than a minimum distance (sd2) between the movable object and the magnetic sensor, or wherein the magnetic source is positioned between the magnetic sensor and the movable object. A method (1700) of determining a position of a movable object. The sensor module (140; 141) for a motor vehicle. The sensor device (1820; 1920) for a motor vehicle. A sensor assembly.

The application provides a double-magnetic-source magnetic fluid sealing device and a cooling control system and method, which comprises a shell, the inside of the shell is rotationally installed with a rotating shaft through a bearing, the rotating shaft is installed with an inner pole shoe, a permanent magnet sleeve and an inner permanent magnet, the bearing is axially limited through the sleeve with the inner pole shoe; the inside of the shell is installed with an outer pole shoe and an outer permanent magnet through radial positioning; the shell is provided with a water inlet, the water inlet is connected with a cooling water channel in the inside of the shell, the outlet of the cooling water channel is connected with a water outlet; the shell is provided with a plurality of magnetic fluid supplementing openings for supplementing magnetic fluid, the magnetic fluid supplementing openings are communicated with tooth and groove holes on the pole shoes; the magnetic fluid supplementing openings simultaneously serve as temperature measuring openings for temperature measurement. By increasing the inner pole shoe and the inner permanent magnet on the shaft, the magnetic gathering performance of the pole shoe is greatly enhanced, the magnetic leakage of the device is reduced, the magnetic motive force of the magnetic circuit is enhanced, the magnetic induction intensity of the sealing gap is improved, and the pressure resistance of the device is increased.

The utility model discloses a magnetic source laminated labyrinth type magnetic liquid sealing structure, which is characterized in that the sealing structure comprises a static ring and a moving ring, a plurality of permanent magnet rings are arranged in a space formed after the static ring and the moving ring are assembled with each other, each permanent magnet ring and a rotating shaft are laminated in the space in parallel, and the permanent magnet rings are arranged in the space. A plurality of permanent magnet rings in the space form a sealing gap, magnetic fluid is injected into the sealing gap, and each permanent magnet ring is composed of an N-pole permanent magnet part and an S-pole permanent magnet part; compared with the prior art that sealing leakage suppression is carried out through dynamic sealing, the magnetofluid is trapped in the sealing gap through the permanent magnet ring, and the zero leakage effect is achieved under certain sealing pressure.

The application discloses a four-drive magnetic source ferromagnetic fluid micro-pump with embedded fixed magnetic sources, and belongs to the technical field of micro-fluid transmission control. The micro-pump comprises a pump body provided with a circular pump cavity, ferromagnetic fluid accommodated in the pump cavity, and a magnetic source system composed of a fixed magnetic source and four rotatable driving magnetic sources. Two driving magnetic sources are arranged on two sides of the pump cavity in each group, and can synchronously rotate around the axis of the pump cavity. The fixed magnetic source and the driving magnetic sources form a five-magnetic-source coupling structure, and a uniform and efficient superimposed magnetic field is generated in the circular pump cavity, so that the ferromagnetic fluid is magnetized to form a stable 'driving disc'. The driving disc rotates with the driving magnetic sources and periodically changes the volume of the pump cavity, so that the fluid is directionally pumped from the liquid inlet to the liquid outlet. Through the multi-magnetic-source coupling and rotary driving design, the magnetic field force and uniformity are significantly enhanced, the driving force, the back pressure resistance, the operation stability and the rotating speed of the micro-pump are effectively improved, and the pollution risk of the magnetic fluid is reduced.

The utility model provides a kind of magnetic circuit structure and magnetic fluid sealing structure with multiple magnetic pole NS alternation arrangement, it is related to magnetic fluid sealing technical field, including at least four levels sequentially arranged single magnetic pole, single magnetic pole includes magnetic source and the pole shoe located magnetic source both sides, the magnetic property of adjacent single magnetic pole mutually close one side is opposite, constitute the arrangement structure of magnetic alternation, first level spacing in arrangement structure is greater than subsequent interval, form asymmetric structure.Multiple magnetic pole NS alternation arrangement is through N-S polarity periodic reversal, realizes magnetic field axial superposition using dissimilarity attraction principle, the magnetic field intensity near sealing surface is promoted, the core pain point that traditional design is solved in magnetic field attenuation fast, magnetic induction intensity is low, meet 0.3-0.5MPa high pressure sealing demand;Magnetic field intensity is decreasing from working surface along axial direction, constitute gradient magnetic pole structure, greatly improve the compression resistance and sealing capacity of sealing element.

The application discloses a kind of multi-magnetic source sleeve type magnetic fluid sealing devices, including shaft, and shell and end cap are spaced sleeve on the shaft;The lateral surface of shaft is sleeved with sleeve, and sleeve is provided with two and is left-right symmetrical distribution, and two sleeves are all sleeved with inner blocking structure and outer blocking structure, and two outer blocking structures are respectively located in the outside of two inner blocking structures;Locking structure is installed in the inside of shaft, and locking structure is provided with two and is left-right symmetrical setting, and two locking structures are respectively passed through the outer lateral surface of shaft and are connected with two outer blocking structures;Two permanent magnet rings are jointly installed between sleeve inner blocking structure, and one permanent magnet ring is jointly installed between outer blocking structure and inner blocking structure.The application can realize the integral type sleeve installation of one permanent magnet ring and two permanent magnet rings, avoids embedding, avoids split type embedding, so that the installation of one permanent magnet ring and two permanent magnet rings can be more convenient, reduces installation difficulty, shortens installation time consumption, and installation efficiency is higher.

The invention belongs to the technical field of magnetic measurement, and particularly relates to a calibration method of a magnetic dipole array. The method comprises the following steps: S1, obtaining an independent calibration model of each magnetic source unit; and S2, according to the independent calibration model, measuring and modeling an additional magnetic field generated by coupling between the magnetic source units, and establishing a compensation model. According to the method, the problem is decomposed into N low-dimensional nonlinear fitting and one linear least square problem, the calculation complexity and time consumption are reduced in order of magnitude, and high efficiency in engineering application is achieved.