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1694 results about "Magnetic shield" patented technology
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Partial discharge high-precision detection method and system for totally-enclosed GIS equipment
The invention relates to the technical field of discharge detection, in particular to a high-precision detection method and device for partial discharge of totally-enclosed GIS equipment. The method comprises the following steps: carrying out metal shell three-dimensional structure modeling on the GIS equipment, and carrying out electromagnetic shielding evaluation so as to obtain a multi-point electromagnetic shielding evaluation value; acquiring an original discharge signal of each sampling point based on the electromagnetic wave sensor, and performing interference suppression processing and back propagation attenuation compensation according to a multi-point electromagnetic shielding evaluation value, so as to obtain an attenuation compensation discharge signal waveform; micro-vibration response parameters are collected based on an MEMS micro-vibration sensor, actual influence waveform point detection marking and physical vibration interference filtering are carried out on attenuation compensation discharge signal waveforms, and therefore pure optimized discharge signal waveforms are obtained. According to the invention, through efficient and accurate partial discharge detection, real-time early warning of the state of the GIS equipment is realized, and the stability and safety of the equipment are improved.
Owner:ZHUHAI OLE DISTRIBUTION AUTOMATION SYST CO LTD
Testing system for testing transformer electromagnetic shielding coupler based on intelligent sensing
The invention discloses a system for testing an electromagnetic shielding coupler of a testing transformer based on intelligent sensing, and relates to the technical field of electrical equipment testing, and the system comprises a flexible distributed intelligent sensing array which is composed of a plurality of high-density miniature electromagnetic sensors and a temperature-vibration composite sensing unit, a non-uniform topological structure is embedded into a seam and an insulating interface area on the surface of the electromagnetic shielding coupler. According to the test system of the test transformer electromagnetic shielding coupler based on intelligent sensing, through dynamic electromagnetic field reconstruction of the flexible distributed intelligent sensing array and multi-band interference coupling modeling, the limitation of a traditional static test is broken through; and real-time capture and multi-dimensional decoupling of shielding effectiveness attenuation characteristics in a complex alternating electromagnetic environment are realized. Compared with a traditional method, the method has the advantages that the shielding effectiveness dynamic quantization error is reduced, and the engineering guidance value of test data is improved.
Owner:JIANGSU JINXIU HIGH VOLTAGE ELECTRIC CO LTD
Mobile phone control handle assembly
A mobile phone control handle assembly is suitable for holding a mobile phone, and is connected to the mobile phone. The mobile phone control handle assembly includes a handle body, a control module, two handle auxiliary accessories, and at least two magnetic shielding members. The handle body is used to hold the mobile phone. The handle body includes buttons and joysticks. When at least one of the buttons and the joysticks is pressed, the control module transmits a corresponding control signal to the mobile phone. The two handle auxiliary accessories are respectively and detachably fixed on two gripping parts of the handle body through magnets. The two magnetic shielding members are used to shield magnetic fields of the magnets. The two handle auxiliary accessories are configured to enhance a gripping experience of a user when gripping the two gripping parts.
Owner:DEXIN CORP
Non-contact magnetoelectric composite current sensor with magnetism gathering and magnetic shielding
ActiveCN120294393AShielding materialsInstrument screening arrangementsElectrical conductorCurrent sensor
The invention discloses a non-contact magnetoelectric composite current sensor with magnetism gathering and magnetic shielding. A sensor core is composed of a magnetoelectric sensing element, a magnetofluid layer, a magnetism gathering structure and a magnetic shielding layer. The magnetoelectric sensing element is made of manganese-doped lead magnesium niobate and amorphous alloy film composite materials, the outer side of the sensing element is coated with a magnetofluid layer made of soft magnetic composite materials, the magnetism gathering structure is made of permalloy materials with high magnetic conductivity and is divided into an upper part and a lower part, the upper part accommodates the sensing element and the magnetofluid layer, and the lower part accommodates the magnetic gathering structure. And the lower part is provided with a standardized groove for placing a conductor to be tested. The outermost layer is a magnetic shielding layer composed of multiple layers of nanocrystalline alloy strips, the vertical split type design is also adopted, and it is ensured that the magnetic shielding layer is tightly matched with the magnetic gathering structure through precision machining. The upper magnetic shielding layer and the lower magnetic shielding layer are detachably connected, and field installation is facilitated. The overall structure is compact, a circuit does not need to be disconnected during installation, and the device is especially suitable for on-line current monitoring requirements in the fields of smart grids, industrial automation and the like.
Owner:YUNNAN ELECTRIC POWER TESTING & RES INST (GRP) CO LTD
Online monitoring device and method for wear particles of water-lubricated bearing by fusing electrostatic induction and optical imaging principles
The invention discloses an electrostatic induction and optical imaging principle-fused online monitoring device and method for wear particles of a water-lubricated bearing, and belongs to the field of state monitoring of mechanical equipment. The device comprises a square insulation detection cavity, a detection electrode array, an electromagnetic shielding shell, a high-speed optical imaging module and a signal processing unit, the square insulation detection cavity is installed in a bearing lubrication water loop. The detection electrode array is fixed to the outer wall of the cavity and used for capturing electrostatic signals generated when the abrasion particles pass through. The electromagnetic shielding shell wraps the detection cavity and is grounded through a wire to eliminate environmental electromagnetic interference. The high-speed optical imaging module integrates a high-magnification microscope lens and a CMOS sensor, is coaxially mounted with the detection cavity, and obtains the morphology characteristics of the wear particles in real time; and the signal processing unit performs multi-modal data fusion analysis on the electrostatic signal and the optical image. Through cooperative detection of electrostatic induction and optical imaging, the monitoring precision and reliability of the wear particles of the water-lubricated bearing are remarkably improved.
Owner:ANHUI UNIVERSITY OF TECHNOLOGY
Cable multi-parameter fusion sensor and method
PendingCN121186545ATesting dielectric strengthMeasurement using digital techniquesCurrent transducerOvervoltage
According to the cable multi-parameter fusion sensor and method, in the cable multi-parameter fusion sensor, a shielding shell is of an open-close type metal annular structure; the zero-flux sensor module is arranged on the inner layer of the shielding shell so as to detect a cable sheath ring current signal; the pulse current sensor module is arranged on the outer side of the zero-flux sensor module so as to detect a cable partial discharge pulse current signal and an overvoltage impact current signal; the magnetic shielding layer is arranged between the zero-flux sensor module and the pulse current sensor module to shield low-frequency magnetic field interference; the zero magnetic flux sensor module and the pulse current sensor module share the shielding shell to form an electromagnetic shielding structure.
Owner:HAIBEI POWER SUPPLY COMPANY STATE GRID QINGHAI ELECTRIC POWER +1
Electromagnetic shielding film and circuit board
PendingCN120321933APrinted circuit detailsMagnetic/electric field screeningElectrical batteryClassical mechanics
The invention discloses an electromagnetic shielding film and a circuit board, the battery shielding film comprises a protective layer, the tensile strength of the protective layer is greater than or equal to 40MPa, and the elongation of the protective layer is greater than or equal to 50%. According to the electromagnetic shielding film, the tensile strength of the protective layer is controlled to be larger than or equal to 40 MPa, and the elongation is controlled to be larger than or equal to 50%, so that the protective layer can bear large tension and has good flexibility and ductility, the tear resistance of the electromagnetic shielding film can be effectively improved, and the service life of the electromagnetic shielding film is prolonged. Therefore, the electromagnetic shielding film can be prevented from being damaged when being pressed on an area with offset on the circuit board while ensuring the complex effect and the shielding effectiveness of pressing.
Owner:GUANGZHOU FANGBANG ELECTRONICS +1
Cement-based material residual magnetism intensity detection device, detection method and evaluation method
PendingCN120468741AMagnitude/direction of magnetic fieldsMaterial magnetic variablesRemanenceSolid component
The invention provides a cement-based material residual magnetism intensity detection device, a detection method and an evaluation method. The cement-based material residual magnetism intensity detection device comprises a magnetic shielding cylinder, a fluxgate magnetometer and a test tool, the magnetic shielding cylinder is used for shielding a magnetic field to ensure stable test environment magnetic field; the fluxgate magnetometer comprises a fluxgate probe and a fluxgate digital display meter, the fluxgate probe is used for measuring a vector value of space magnetic induction intensity at a position corresponding to the fluxgate probe, and the fluxgate digital display meter is used for displaying a residual magnetism intensity measured value measured by the fluxgate probe; the test tool is arranged in the magnetic shielding cylinder and is used for placing a sample to be tested and fixing a fluxgate probe; according to the invention, a fluxgate magnetometer and a magnetic shielding cylinder are adopted to detect the residual magnetism intensity of the cement-based material, a standardized detection process and a test method are provided for solid components, a liquid mixture and a molded test block, and quantitative characterization of the distribution rule of the residual magnetism intensity of the cement-based material is realized through fewer detection points.
Owner:CHINA CONSTR EIGHT ENG DIV CORP LTD
Scanning electron microscope
PendingCN121171859AMaterial analysis using wave/particle radiationElectric discharge tubesParticle physicsMagnetic shield
The invention discloses a scanning electron microscope. The scanning electron microscope comprises a scanning electron microscope main body and a sample table located in a sample cavity, the scanning electron microscope main body is fixedly connected with the upper cover of the sample cavity, so that a closed space is formed in the sample cavity; a closed-loop groove is formed in an upper cover of the sample cavity; wherein the groove is located outside the connection position of the upper cover of the sample cavity and the scanning electron microscope main body, and the bottom of the groove is not higher than the supporting surface of the sample table; a magnetic shielding layer is arranged in the groove; wherein the length of the magnetic shielding layer is not less than the distance from the objective lens of the scanning electron microscope main body to the supporting surface of the sample stage.
Owner:SKYVERSE TECH CO LTD
Comprehensive shielding signal cable and manufacturing method thereof
The invention provides a comprehensive shielding signal cable and a manufacturing method thereof.The comprehensive shielding signal cable comprises a cable core and a protective layer wrapping the cable core, and the protective layer sequentially comprises a composite shielding layer and an outer sheath layer from inside to outside; the composite shielding layer comprises an iron-based amorphous nanocrystalline alloy layer, a 3D woven mesh layer and a conductive polymer coating which are sequentially arranged on the outer side of the cable core from inside to outside; through the gradient composite structure of the iron-based amorphous nanocrystalline alloy layer (low-frequency magnetic shielding), the 3D woven mesh layer (medium-frequency electromagnetic shielding) and the conductive polymer coating (high-frequency electric field shielding), the full-band shielding effectiveness is realized for the first time, meanwhile, the return loss is greatly reduced, the electromagnetic transmission performance and reliability of the cable are improved, and the service life of the cable is prolonged. And the structural stability of the cable is improved.
Owner:JIANGSU TONGDING OPTIC-ELECTRONIC TECH CO LTD
Power communication network risk identification method and system, and storage medium
The invention provides a power communication network risk identification method and system and a storage medium. The method comprises the following steps: acquiring electromagnetic interference environment parameters, acquiring optical cable laying path and tower structure data, and analyzing a distribution rule of grounding points of an electromagnetic shielding layer; the influence of electromagnetic interference on signals is eliminated according to a grounding point distribution rule; acquiring optical cable strain information, and extracting optical cable strain change characteristics; determining an optical cable fault and a fault point initial position; correcting the position of a fault point; evaluating the damage degree caused by the magnetic field; and generating a fault point repair suggestion, updating the optical cable state database, and generating an optical cable health state report focusing high magnetic field influence. By implementing the method, the optical cable fault can be effectively positioned, the damage degree of the optical cable can be accurately evaluated, and the stability of a power communication network can be improved.
Owner:SHENZHEN POWER SUPPLY BUREAU
Lithium battery detection device based on BB optical pump magnetic imaging
PendingCN120669177AElectrical testingMagnetic field measurement using magneto-optic devicesPhotodetectorImaging quality
A lithium battery detection device based on BB optical pump magnetic imaging comprises a magnetic shielding cylinder and a substrate arranged in the magnetic shielding cylinder, and a laser, an optical lens system, an atomic gas chamber system, an array lens and an array photoelectric detector are sequentially arranged on the working face of the substrate from left to right; the atomic gas chamber system contains alkali metal atoms and buffer gas; a non-magnetic objective table for placing a lithium battery to be tested is arranged above the atomic gas chamber; according to the device, the array lens is adopted to split and focus a single beam of detection laser into small light spots which are respectively irradiated on different photoelectric detectors, and magnetic field information of a plurality of space point locations is detected at one time, so that the consistency and imaging quality of a subsystem are improved, and the system cost is saved.
Owner:ZHEJIANG UNIV OF TECH
Magnetic leakage prevention bearing structure
The invention relates to the technical field of magnetic suspension bearings, and provides a magnetic leakage prevention bearing structure which comprises a flux sleeve, a shell, a magnetic part, an inner-layer magnet yoke and an outer-layer magnet yoke. The shell is sleeved outside the flux sleeve, and an inner ring of the shell is provided with a mounting space; the magnetic part is arranged in the mounting space; the inner-layer magnet yoke is arranged in the mounting space and connected with the shell, the inner-layer magnet yoke is concaved inwards to form a first containing groove, and the magnetic part is contained in the first containing groove; the outer-layer magnet yoke is arranged in the installation space and connected with the shell, the outer-layer magnet yoke is concaved inwards to form a second containing groove, and the inner-layer magnet yoke is contained in the second containing groove. A closed magnetic circuit is formed through a double-layer magnet yoke nested structure, the axial magnetic shielding layer design is matched, magnetic flux leakage is effectively restrained, the magnetic field energy utilization rate is increased, electromagnetic interference to external equipment is reduced, and meanwhile the bearing performance and operation stability of the bearing are remarkably improved by optimizing magnet yoke thickness distribution and the permanent magnet arrangement mode.
Owner:CHINA STATE SHIPBUILDING CORP LTD RESEARCH INSTITUTE 719
Flexible electromagnetic shielding film
The invention provides a flexible electromagnetic shielding film and a preparation method thereof. The preparation method comprises the following steps: mixing metal gallium and metal indium in a preset proportion to prepare a gallium-indium alloy; the preparation method comprises the following steps: putting a preset mass of gallium-indium alloy into an isopropanol solution, and treating through an ultrasonic cell disruption system to obtain a liquid metal particle suspension; stirring magnetic functional nanoparticles, an electrostatic spinning high-molecular elastomer and a solvent at normal temperature for a preset time to obtain an electrostatic spinning homogeneous solution; treating the electrostatic spinning homogeneous solution by adopting an electrostatic spinning process to obtain a magnetic nanofiber membrane; and spraying the liquid metal particle suspension onto the magnetic nanofiber membrane by adopting an electrostatic spraying process to obtain the flexible electromagnetic shielding film. According to the flexible electromagnetic shielding film and the preparation method thereof, the problem that the stability of an existing shielding material is reduced under the stretching effect can be solved.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
Rubidium-based magnetometer for BIO-sensing application
PCT designated stageWO2025210604A1Measurements using NMR spectroscopySensorsVertical-cavity surface-emitting laserMagnetogram
The invention relates to a Spin Exchange Relaxation-Free (SERF)-based magnetometer system (100) for detecting ultra- weak magnetic fields, particularly suited for bio¬ sensing applications such as MEG, MCG, and MRI. The system operates at room temperature and includes a VCSEL (101) emitting dual beams tuned to Rubidium-87 transitions, a microfabricated vapor cell (102) with LIAD-based heating (103), and an optical assembly (104) for polarization control. A detection unit (105) converts Faraday rotation into electrical signals, enhanced by lock-in amplification. Magnetic shielding (106), thermal management (107), and relaxation mitigation maintain SERF conditions. A calibration subsystem (109) and embedded machine learning module (110) optimize sensitivity in real time. The compact, cryogen-free architecture enables portable and wearable applications. The invention achieves femtotesla-level sensitivity while overcoming limitations of conventional SQUID-based systems, making it suitable for clinical and field deployments.
Owner:QUANTUMSTATS AI GLOBAL PTE LTD
Electromagnetic shielding device of complex electronic system
ActiveCN120475702AMagnetic/electric field screeningAntenna couplingsElectronic systemsRadio telescope
The invention provides an electromagnetic shielding device of a complex electronic system, which belongs to the technical field of electromagnetic shielding of radio telescopes and comprises a filter shielding cabinet, a waveguide tube and a connecting mechanism. The filter shielding cabinet is arranged at the top of the shielding cabin and located outside the shielding cabin; a servo system shielding cabinet is arranged in the shielding cabin; the filter shielding cabinet is provided with a wire outlet pipe, the shielding cabin is provided with a mounting port, and the wire outlet pipe penetrates through the mounting port to enter the shielding cabin. And one end of the waveguide tube is connected with the filtering shielding mechanism, and the other end of the waveguide tube is connected with the servo system shielding cabinet. And the connecting mechanism is arranged at the wire outlet pipe and is used for connecting the wire outlet pipe and the waveguide tube or connecting the waveguide tube and the servo system shielding cabinet. The filter shielding cabinet is arranged outside the shielding cabin, the internal space of the shielding cabin is not occupied, and the problems that the space in the shielding cabin is narrow, and the filter shielding cabinet is difficult to install are solved.
Owner:NORTHERN ENG DESIGN & RES INST CO LTD
Unlocking mechanism and magnetic shielding cabin
PendingCN120465773AMagnetic/electric field screeningBuilding locksClassical mechanicsStructural engineering
Owner:杭州极弱磁场国家重大科技基础设施研究院
Preparation method of flexible electromagnetic shielding type force sensor based on coaxial structure
PendingCN120992070AElectroconductive/antistatic filament manufactureMagnetic/electric field screeningFiberHuman–machine interface
The invention discloses a preparation method of a flexible electromagnetic shielding type force sensor based on a coaxial structure, and belongs to the field of flexible electronics and intelligent sensors. According to the method, a coaxial wet spinning process is adopted, a core-sheath structure conductive fiber is constructed, a core layer is made of a multi-walled carbon nanotube (CNT) and thermoplastic polyurethane (TPU) composite material, and a sheath layer is made of a nickel-coated carbon nanotube (Ni-CNT) and TPU composite material. By regulating and controlling the proportion of the core sheath, the construction of the gradient conductive network is realized, and the sensing sensitivity, the electromagnetic shielding performance and the mechanical flexibility are improved. The obtained Ni-CNT-coated CNT fiber is made into fabric and integrated in a sensing glove, and multi-finger bending detection and wireless man-machine interaction control are achieved. The sensor has the advantages of high sensitivity, wide strain detection range and excellent electromagnetic shielding effectiveness, is suitable for the fields of intelligent wearing, anti-interference man-machine interface and fire-fighting equipment, and can also be expanded to complex application scenes such as aerospace teleoperation.
Owner:邵一前
Polyether-ether-ketone-based composite material with low reflection and high electromagnetic shielding effectiveness and preparation method of polyether-ether-ketone-based composite material
PendingCN120535823AMagnetic/electric field screeningLiquid/solution decomposition chemical coatingNon solventPolymer science
The invention discloses a polyether-ether-ketone-based composite material with low reflection and high electromagnetic shielding effectiveness and a preparation method of the polyether-ether-ketone-based composite material, and belongs to the technical field of electromagnetic shielding materials. The problems that an existing electromagnetic shielding material is high in reflection coefficient, insufficient in shielding effectiveness, poor in high temperature resistance and corrosion resistance and difficult to adapt to severe environment service are solved. The composite material is composed of a porous conductive substrate and an asymmetric conductive layer. Wherein the porous conductive substrate is formed by blending a soluble ketimine type polyether-ether-ketone solution and a conductive filler suspension and then carrying out non-solvent induced phase separation and acidification reduction reaction, the electric conductivity is 2.8 * 10 <-4 >-0.1839 S / cm, and the porosity is 80%-90%; the asymmetric conductive layer is plated on the surface of one side of the porous conductive substrate, and the asymmetric conductive layer is made of nickel-phosphorus alloy. The composite material significantly reduces the electromagnetic wave reflection coefficient through an absorption-reflection-reabsorption mechanism, has high electromagnetic shielding effectiveness and excellent high temperature resistance and corrosion resistance, and is suitable for serving in a severe environment.
Owner:JILIN UNIVERSITY
Pressure release valve with integral magnetic shield
ActiveCN223975592UOperating means/releasing devices for valvesEqualizing valvesMagnetic shieldMagnetic isolation
The pressure release valve comprises a shell and a fixing sleeve arranged on the shell, an installation cavity is formed in the shell, an electromagnetic coil assembly is arranged in the installation cavity, the magnetic isolation sleeve is inserted in the installation cavity, the magnetic isolation sleeve is connected between the shell and the fixing sleeve in an abutting mode and isolates the installation cavity, and the electromagnetic coil assembly is arranged in the magnetic isolation sleeve. A movable valve element is arranged on the magnetism isolating sleeve in a sliding mode, and the end of the movable valve element is connected with a sealing piece.
Owner:NINGBO CHAOCHAO ELECTRICAL APPLIANCE CO LTD
Testing system and method for providing large weak magnetic space based on high-frequency magnetic field
The invention discloses a test system and method for providing a large weak magnetic space based on a high-frequency magnetic field, relates to the technical field of magnetic shielding coefficient test of a magnetic shielding space, and mainly aims to solve the problems that the internal space of existing equipment for providing the weak magnetic space is small; the system comprises a high-frequency magnetic field emission module, a magnetic field intensity acquisition module and a passive magnetic shielding assembly. The high-frequency magnetic field transmitting module comprises at least one pair of large coils with the same number of winding turns, and the large coils are coaxially arranged in parallel and used for transmitting a high-frequency magnetic field to the passive magnetic shielding assembly; the passive magnetic shielding assembly provides a weak magnetic space after performing a magnetic shielding effect on the high-frequency magnetic field; and the magnetic field intensity acquisition module is used for acquiring and recording the magnetic field intensity in the weak magnetic space in the passive magnetic shielding assembly.
Owner:杭州极弱磁场国家重大科技基础设施研究院
Zero magnetic shielding device and use method thereof
The invention discloses a zero magnetic shielding device and a use method thereof, and the device comprises a magnetic shielding cylinder which is composed of a shielding cylinder body and a shielding cover detachably connected with the shielding cylinder body. And the non-magnetic multifunctional test frame is arranged in the magnetic shielding cylinder and consists of an arc-shaped seat, a lifting mechanism, a test bedplate, a track, a storage rack, a Helmholtz coil and a folding nylon magnetic sensing assembly. When the magnetic flux and residual magnetism switching test is carried out on the object to be tested in the magnetic shielding cylinder, the non-magnetic multifunctional test frame does not need to be replaced, the efficiency of the magnetic flux and residual magnetism switching test on the object to be tested in the magnetic shielding cylinder is improved, and the advantage of convenient switching test is achieved. And the method has the advantages of high measurement precision and wide application range.
Owner:SHANGHAI CONSTRUCTION GROUP CO LTD +2
Electromagnetic shielding gap material
The invention relates to the technical field of electromagnetic shielding materials, in particular to an electromagnetic shielding gap material. The electromagnetic shielding gap material comprises the following raw materials in parts by mass: 100 parts of methyl vinyl silicone rubber, 15-16 parts of graphene nanosheets, 3-5 parts of carbon nanotubes, 4-6 parts of nano Fe3O4, 3-5 parts of a coupling agent, 2-5 parts of hydroxyl silicone oil, 1 part of zinc stearate, 0.5-1 part of peroxide and 10-15 parts of diatomite. According to the invention, conductive fillers such as expensive silver powder and the like are not needed, the electromagnetic shielding effect and the conductivity of the rubber electromagnetic shielding gap material are improved in a mode of compounding the graphene nanosheets, the carbon nanotubes, the nano Fe3O4 and the diatomite, and meanwhile, the mechanical property of the rubber material is prevented from being reduced. The electromagnetic shielding gap material disclosed by the invention has relatively good shielding effectiveness in a high frequency band (1-18GHz waveband), and has important practical application significance.
Owner:HEFEI ZHONGYIN EQUIPMENT CO LTD
Systems and Methods for Biomagnetic Field Imaging
PendingUS20250261890A1Magnetic field measurement using flux-gate principleDiagnostic recording/measuringMagnetic shieldAtomic physics
A system for measuring magnetic fields from a subject's organ comprises a plurality of unshielded magnetometers in a three-dimensional arrangement and an electromagnetic source. The system is configured to simultaneously collect, via each magnetometer of the plurality of magnetometers, (i) a biomagnetic field from at least a portion of the subject's organ, (ii) an electromagnetic signal from the electromagnetic source, and (iii) a background magnetic field. The system is configured to synchronize a plurality of magnetic signals collected by the plurality of magnetometers according to the electromagnetic signal from the electromagnetic source. The system is configured to output a signal indicative of the collected biomagnetic field and the background magnetic field in accordance with the synchronizing. The system is configured to operate without magnetic shielding.
Owner:SB TECH INC
Self-adaptive active adjustment type magnetic shielding device degaussing circuit and device
The invention relates to the technical field of magnetic shielding, and discloses a self-adaptive active adjustment type magnetic shielding device demagnetization circuit and device, and a control acquisition system, which are used for comparing a residual magnetism state with a preset expected value and generating a control instruction; the energy output identification system is used for outputting an alternating current degaussing signal according to the control instruction to perform degaussing, outputting an excitation pulse signal to perform residual magnetism detection, identifying a zero crossing point of the alternating current degaussing signal and realizing mode switching of degaussing and residual magnetism detection; and the magnetic shielding device is used for demagnetizing under the action of the alternating current demagnetizing signal and feeding back the residual magnetism state of the preset feature point under the action of the excitation pulse signal. The demagnetization is interrupted at the preset feature points in the demagnetization process, the real-time residual magnetism state is collected, and the demagnetization parameter at the next moment is adjusted after the real-time residual magnetism state is compared with the preset residual magnetism expected value, so that the problem of low efficiency due to the fact that the demagnetization parameter needs to be reset after the process is finished is solved, and the demagnetization efficiency and accuracy are greatly improved.
Owner:杭州极弱磁场国家重大科技基础设施研究院
Rapid mixing equipment for electromagnetic shielding conductive coating
InactiveCN120618297ARotary stirring mixersTransportation and packagingRotational axisConductive coating
The invention solves the problem that the mixing uniformity is insufficient when a traditional single stirring assembly rotates unidirectionally to mix conductive coatings, and relates to the technical field of conductive coating mixing, in particular to rapid mixing equipment for electromagnetic shielding conductive coatings, which comprises a mixing tank and a stirrer, and a limiting hanging bracket is mounted on the inner wall of the mixing tank; the end, close to the vertical central axis of the mixing tank, of the limiting hanging bracket is rotationally connected with an outer stirring assembly; the outer stirring assembly comprises a connecting shaft arranged between the outer side of a stirring impeller of the stirrer and the inner wall of the mixing tank, a plurality of stirring blades are mounted on the outer surface of the connecting shaft, an extension plate is formed at the top of the connecting shaft, a rotating shaft of the stirrer is sleeved with a transmission structure, and the transmission structure is used for transmitting rotating power of the stirrer to the connecting shaft; the stirring blades are driven to circumferentially rotate in the direction opposite to the rotating shaft by taking the rotating shaft as the circle center. The material exchange of the conductive coating can be enhanced, and the dead zone of traditional one-way stirring is eliminated.
Owner:ANHUI KAILIN ADVANCED MATERIAL CO LTD +1
Magnetic shielding box for weak magnetic signal measurement and shielding effectiveness estimation method
The invention provides a magnetic shielding box for weak magnetic signal measurement and a shielding effectiveness estimation method. The magnetic shielding box comprises a non-magnetic supporting frame and a shielding mechanism. The non-magnetic supporting frame is a cuboid, is at least arranged along the edges of the cuboid and is used for supporting the shielding mechanism, and the interior of the non-magnetic supporting frame is hollow so as to accommodate an object to be detected; the shielding mechanism at least comprises N layers of plate layer structures, plate layer fixing pieces and plate layer supporting pieces; the plate layer structures are sequentially arranged outside the non-magnetic supporting frame in a sleeving mode so as to isolate an external magnetic field of the magnetic shielding box. The plate layer fixing piece sequentially penetrates through all the plate layer structures and is fixedly embedded into the non-magnetic supporting frame. The plate layer supporting pieces are at least arranged between the two adjacent plate layer structures and used for controlling the distance between the two adjacent plate layer structures. N is an integer greater than or equal to 2. The problem of complex manufacturing of the magnetic shielding box can be solved, and the shielding effects of different frequency bands are ensured.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Low-harmonic low-noise high-efficiency high-reliability axial magnetic field permanent magnet shielding pump
PendingCN120777207AAssociation with control/drive circuitsCooling/ventillation arrangementLow noiseImpeller
The invention belongs to the field of shield pumps, and relates to a low-harmonic low-noise high-efficiency high-reliability axial magnetic field permanent magnet shield pump which comprises a pump body. The pump body is provided with an impeller accommodating cavity, a liquid inlet and a liquid outlet are formed in the pump body, and the liquid inlet and the liquid outlet are respectively communicated with the impeller accommodating cavity; the power unit is mounted on the pump body; the power unit comprises a front disc type stator, an axial magnetic field rotor, a rear disc type stator, an impeller and an integrated controller, the front disc type stator is installed on the pump body, and the rear disc type stator is installed on the front disc type stator; the axial magnetic field rotor is arranged between the front disc type stator and the rear disc type stator; the integrated controller is installed on the rear disc type stator. After the structure is adopted, the motor has the beneficial effects that the structure is more compact, the efficiency is higher, the noise is lower, the cooling and heat dissipation are better, the main materials are more saved, the cost is lower, the maintenance is convenient, and the motor can be widely applied to more fields.
Owner:SHANGHAI QIANJIN FLUID EQUIPMENT CO LTD
Magnetic shielding unit hanging positioning and precision adjusting tool and mounting method
The invention provides a magnetic shielding unit hanging positioning and precision adjusting tool and an installation method. The magnetic shielding unit positioning tool comprises a sleeving shell matched with the outer contour of a base and provided with an opening in the lower portion. A guide channel is formed in the middle of the sleeving shell; a guide structure expanding outwards is formed at the inlet end of the guide channel, and a positioning closing opening for clamping a hook of the magnetic shielding unit is formed at the tail part of the guide structure; the parts, on the two sides of the guide channel, of the sleeving shell are connected. The magnetic shielding unit hanging precision adjusting tool comprises a sleeving frame which is matched with the outer contour of a base and provided with an opening in the lower portion. Two threaded driving units are symmetrically arranged in the middle of the sleeving frame, the axes of the two threaded driving units are parallel, and the ends of the two threaded driving units are oppositely arranged. And an adjusting space for accommodating a hook of the magnetic shielding unit is formed between the two threaded driving units. According to the scheme, rapid hanging mounting is achieved through a horn mouth type guide structure of the positioning tool, and the precision is guaranteed through fine adjustment of double screws of the adjusting tool.
Owner:杭州极弱磁场国家重大科技基础设施研究院
Electro-magnetic shield to prevent bearing and / or gearbox damage due to shaft induced voltage in electric motors
ActiveUS20250219512A1Association with grounding devicesWindings conductor shape/form/constructionCapacitanceElectric cars
Common mode voltage discharge shields are disposed over end turns of stator windings for a three phase electric traction motor within an electric vehicle. The common mode voltage discharge shields are capacitively coupled to the end turns to a ground strap, providing a low impedance path for common mode voltages accumulating at a neutral for electric traction motor as a result of high frequency switching of the motor drive voltage to produce desired torque. An insulating layer separates the common mode voltage discharge shields from the end turns. Accumulation of the common mode voltage in excess of a bearing breakdown voltage, and the associated potential for discharge through bearings between the stator and rotor and electrical discharge machining, is reduced or eliminated.
Owner:WHS ENERGY SOLUTIONS LLC