202 results about "Magnetic shield" patented technology

The application discloses a novel lung lobe-shaped magnetic shielding partial discharge detection device and a detection method. The device comprises an isolation transformer, a bushing, a detection electrode and a partial discharge instrument. A single-phase power supply is connected with a reactor in parallel, and then connected with an input end of the isolation transformer. One end of an output end of the isolation transformer is connected with the bushing, and then connected with the detection electrode. The other end of the output end of the isolation transformer is grounded. A grounding end of a to-be-detected lung lobe-shaped magnetic shielding is grounded, and the grounding end of the to-be-detected lung lobe-shaped magnetic shielding is connected with the partial discharge instrument. The to-be-detected lung lobe-shaped magnetic shielding and the detection electrode are correspondingly arranged to form an equivalent capacitor and are coupled and connected. The application can be used to determine whether there is a defect in the lung lobe-shaped magnetic shielding by performing a partial discharge test on the lung lobe-shaped magnetic shielding before the lung lobe-shaped magnetic shielding is assembled into a transformer. The application has the characteristics of high test efficiency and low applied voltage, and greatly improves the first-time pass rate of the transformer product provided with the lung lobe-shaped magnetic shielding.

The application relates to the technical field of laser detection tooling, and particularly discloses a thickness detection mechanism for an electromagnetic shielding sputtering film coating layer, which comprises a rack and a machine shell fixed to the outer side of the top end of the rack; further comprises a lifting plate which is installed in the middle part of the inner side of the machine shell in a lifting manner through a lifting adjusting mechanism, a first rotating disc is rotatably installed on the inner side of the lifting plate, and the top surface of the first rotating disc is fixed with two groups of upper laser measuring assemblies; a fixing frame is installed on the middle part of the top surface of the rack in a sliding manner through a sliding adjusting mechanism, a second rotating disc is rotatably installed on the inner side of the fixing frame, and the bottom surface of the second rotating disc is fixed with two groups of lower laser measuring assemblies corresponding to the upper laser measuring assemblies. The thickness detection mechanism for the electromagnetic shielding sputtering film coating layer can be adaptively adjusted and matched, can be used in sample and continuous detection double scenes through double-face synchronous laser measurement and rotating adjustment, and can complete coating thickness detection with high precision and high efficiency.

The utility model relates to road detection technical field especially, it relates to a road flatness intelligent detection device, including main control circuit, multichannel capacitance sensor array, electromagnetic shield casing, the multichannel capacitance sensor array is by the multiple capacitive proximity sensor that is arranged in matrix, is fixed in detection device bottom, the multichannel capacitance sensor array adopts differential type measurement structure, and is equipped with the isolation drive ring between adjacent capacitive proximity sensor, the signal conditioning circuit is connected between the multichannel capacitance sensor array and main control circuit, the inertia measurement unit is connected to main control circuit, the electromagnetic shield casing covers the device, adopts the layered shielding structure, contains at least one conducting layer and a layer electromagnetic shield layer, and is connected through multipoint earthing between layers, the utility model can adopt multichannel capacitance sensor array and realize high accuracy, non -contact type measurement, and through the electromagnetic shield design, temperature compensation and attitude change compensation of the target ensure measurement stability.

The application discloses an electromagnetic shielding sealant strip, which comprises a sealant strip, one end of the sealant strip is connected with glass, the other end of the sealant strip is connected with a door frame, the sealant strip comprises a main strip, a throwing groove is arranged on the main strip, and a throwing core strip is clamped and connected in the throwing groove. The electromagnetic shielding sealant strip can achieve the purpose of quick escape, quickly separate the glass from the door frame, and does not need to break the glass to escape, thereby saving the escape time, reducing the risk of injury in the escape process, ensuring the efficiency of separating the glass, and making the process more simple, so that the glass is completely separated, and glass fragments generated after the glass is knocked to pieces are avoided, and personnel are not scratched in the emergency escape process.

This invention discloses a non-embedded UAV information acquisition device and method. The non-embedded UAV information acquisition device includes a shell assembly, a three-mode adapter structure, a standardized physical interface, a main control module, a communication module, a positioning and sensing module, and a power management module. The internal cavity wall of the shell assembly is fitted with an anti-magnetic shielding layer made of permalloy. The three-mode adapter structure is integrated into the bottom of the shell assembly and includes a magnetic suction component, a suspension component, and a screw fixing interface. The standardized physical interface is located on the surface of the shell assembly and uses a gold-plated gold finger contact structure, which is electrically connected to the main control module. This invention enables deployment without disassembly of the UAV through a non-intrusive design while maintaining the UAV's airworthiness. It utilizes edge computing to alleviate cloud scheduling pressure and reduce task latency, and with independent power supply, achieves long endurance and high reliability, making it widely adaptable to various UAV models and harsh operating environments.

The present application relates to the technical field of phase modifier control, in particular to a dynamic reactive power control method and system based on a phase modifier, comprising: acquiring real-time voltage deviation of the phase modifier during operation, and calling corresponding pole phase group rearrangement scheme; calculating magnetic density increment of end structure according to phase advance operation depth of the phase modifier, and activating end magnetic circuit optimization control logic when exceeding temperature rise intervention threshold, adjusting the magnetic circuit by simulating magnetic shielding, setting the material properties of the anti-magnetic steel, and introducing equivalent slot impedance; calculating end potential gradient according to the magnetic density increment, and activating end circuit blocking control logic when exceeding circulating current blocking threshold, blocking the circuit anomaly by inserting equivalent insulation sleeve, short-circuiting positioning rib, and laying equivalent insulation sheet; and coupling the output parameters of the two control logics with the pole phase group rearrangement scheme to generate dynamic reactive power distribution instructions. The method can solve the end temperature rise and circulating current discharge problems during the phase advance operation of the phase modifier, and improve the operation stability.

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

The utility model discloses a fan assembly, patient ventilation system and magnetic resonance imaging system for patient ventilation system in magnetic resonance imaging system, wherein, fan assembly includes: fan group, it includes at least two axial flow fan, at least two axial flow fan is fixed with the way of realizing air port series pressurization, magnetic shielding casing, it covers the periphery of fan group, air inlet connector, it is arranged on the air inlet side of magnetic shielding casing near fan group for with the air inlet pipeline connection of patient ventilation system, and air outlet connector, it is arranged on the air outlet side of magnetic shielding casing near fan group for with the patient ventilation pipeline connection of patient ventilation system. The technical scheme in the utility model embodiment can solve the patient ventilation problem of MRI system.

This application relates to an installation device for a magnetic shielding cover of a motor, belonging to the technical field of magnetic shielding cover installation. It includes a benchtop manual press, a quick-release mechanism, and a lower punch block. The quick-release mechanism includes a quick-release mounting block and a quick-release assembly. The quick-release mounting block is mounted on the benchtop manual press, and the lower punch block is mounted on the quick-release mounting block. The lower punch block is used to place the motor on which the magnetic shielding cover needs to be installed. The quick-release assembly includes a quick-release rod and an elastic element. The quick-release rod is slidably connected to the quick-release mounting block, and its end is inserted into the lower punch block. The elastic element is sleeved on the quick-release rod, with one end abutting against the quick-release mounting block and the other end abutting against the quick-release rod. The quick-release mechanism enables rapid disassembly and installation of the lower punch block, improving work efficiency.

A Josephson parametric amplifier packaging module, relating to the technical field of quantum computing. The Josephson parametric amplifier packaging module comprises a substrate (1), a magnetic shield (2), a circulator (3) and a Josephson parametric amplifier (4). The magnetic shield (2) is fixed on the substrate (1), and the magnetic shield (2) comprises a first cavity (201) and a second cavity (202). The circulator (3) and the Josephson parametric amplifier (4) are respectively located in the first cavity (201) and the second cavity (202), the circulator (3) comprises a first port (31), a second port (32) and a third port (33), and the Josephson parametric amplifier (4) comprises a signal port (41) and a pump port (42). The second port (32) is coupled to the signal port (41) by means of a connector (5), and the first port (31), the third port (33) and the pump port (42) extend to the exterior of the magnetic shield (2).

This invention relates to the field of electronic device testing technology, specifically to a high-precision automated testing system for triaxial magnetic sensor chips applied to FPCs. This system requires no adapters, has strong anti-interference capabilities, a high degree of automation, and comprehensive testing coverage. It includes the following modules: a pneumatic pressing structure and safety protection light curtain for automated and safe contact with the FPC under test; a magnetic shield made of high-permeability material to isolate external magnetic fields from interference; a test coil, built into the center of the shield to generate a uniform magnetic field in a vertical direction; a communication and data acquisition module electrically connected to the corresponding test point on the FPC via probes at the bottom of the fixture; and a control and display module for displaying the testing process and results, as well as an interface for connecting to a host computer for log storage.

The present application relates to the technical field of nondestructive testing of metal materials, and particularly relates to a billet magnetic particle flaw detection device and method based on a transient closed high-permeability shielding. The device comprises: a conveying roller for conveying a billet; a magnetizing coil for magnetizing the billet conveyed by the conveying roller; a transient magnetic circuit reconstruction unit comprising a high-permeability supporting base and a profiled high-permeability shielding body which are matched with each other and located in the magnetizing coil, and an opening and closing driving mechanism connected with at least one of the high-permeability supporting base and the profiled high-permeability shielding body; and an auxiliary end identification unit comprising a spraying system for spraying a magnetic suspension to the billet and a shooting mechanism for shooting a magnetic mark formed on the billet. The present application can realize high-quality detection of the end of the billet under the premise of no pause and no speed reduction by constructing a transient local high-permeability loop and reshaping the longitudinal magnetic field distribution of the end region.

The application belongs to the technical field of medical apparatus and instruments, and discloses an electromagnetic shielding shell and a medical electrical equipment. The electromagnetic shielding shell is used for preventing an electrical module from radiating excessive electromagnetic radiation outward or preventing external high-frequency electromagnetic waves from interfering with the operation of the electrical module. The electromagnetic shielding shell comprises a shell. The side surface of the shell is provided with a shielding layer made of shielding material. The side surface of the shell is provided with a plurality of grooves. The plurality of grooves extend in different directions and are distributed along the circumference of the shell. The plurality of grooves are sequentially intersected, and the grooves are filled with shielding material, so that the plurality of grooves form a shielding net for shielding electromagnetic waves. When the shell is processed, the thickness of the shielding material is effectively increased due to the plurality of grooves, so that the shell can form a shielding layer and a shielding net with appropriate thickness of the shielding material on the side surface of the shell, so as to effectively prevent the electrical module in the shell from radiating excessive electromagnetic radiation outward or prevent external high-frequency electromagnetic waves from interfering with the operation of the electrical module.

The utility model discloses a magnetorheological sound insulation cotton damping with anti -interference structure relates to sound insulation material technical field, including sound insulation cotton layer and anti -interference structure layer. The composite electromagnetic shielding layer of the magnetorheological sound insulation cotton damping with anti -interference structure outermost layer is alternately woven composite by nanometer copper net and graphene film, can be all -round shielding to electromagnetic interference, creates stable electromagnetic environment for the inside magnetorheological liquid filling cavity, effectively avoids the outside electromagnetic signal interference magnetorheological liquid response to the magnetic field, guarantees its rheological characteristic stable play, the three -dimensional shock attenuation layer of inner layer adopts the even arrangement of hexagonal honeycomb -like elastic rubber film and viscoelastic damping block, and is matched with interval distribution's shock attenuation spring and shock attenuation rubber block, can form multistage shock attenuation system, effectively absorbs and buffers mechanical vibration, greatly reduced the influence of outside vibration to sound insulation cotton layer and magnetorheological liquid filling cavity, has improved the reliability of product under complex vibration environment significantly.

This utility model belongs to the field of shielded pumps and relates to a coreless magnetic steel rotor for the axial magnetic field of a permanent magnet shielded pump. It includes: a rotating shaft, with a front ceramic layer and a rear ceramic layer formed by thermal spraying ceramic layers onto the front and rear middle sections of the shaft; an impeller mounted on one end of the rotating shaft; a ceramic ball bearing and a bearing pressure ring mounted on the other end of the rotating shaft; and a coreless magnetic steel rotor mounted on the rotating shaft. The advantages of this structure are: using a stainless steel shaft with thermally sprayed ceramic layers on the bearing positions effectively prevents and eliminates the drawbacks of traditional water bearings, such as short lifespan and easy wear, and ceramic shaft breakage due to overload impact from the medium.

The application discloses a device and method for simulating single particle effect under the action of a space magnetic field, which comprises a radiation source, a zero magnetic shielding mechanism, a magnetic field generator and a test controller, wherein the radiation source is located outside the zero magnetic shielding mechanism, the magnetic field generator is located inside the zero magnetic shielding mechanism, the measured electronic device is placed in the action range of the radiation source and in the magnetic field range generated by the magnetic field generator, and the test controller is connected with the magnetic field generator and the measured electronic device respectively. According to the application, the test data of the single particle effect under different magnetic field actions can be obtained, and the reliability of the simulation data of the device under the action of the space magnetic field, especially under the action of a strong magnetic field, is improved.

The utility model discloses a kind of magneto-rheological polishing assembly and magneto-rheological polishing device, it is related to the field of magneto-rheological polishing, including support plate, magnetic field generator is rotatably arranged in the support plate lower, the support plate top is fixed with liquid storage cylinder, the support plate one side is fixed with support frame, sliding seat is slidably arranged on the support frame, the sliding seat bottom end is rotatably connected with rotating shaft, the rotating shaft outside is fixed with carousel, carousel upper is provided with round cover, the round cover inner ring is fixed with second magnetic shield, when cylinder drives carousel and workpiece is inserted into liquid storage cylinder inside, carousel outside round cover will shield the top of liquid storage cylinder, avoid carousel rotation, hit magneto-rheological fluid, make magneto-rheological fluid splash, cause waste, simultaneously, the first magnetic shield of round cover inside can block the upper end of the magnetic field generated by magnetic field generator, avoid magnetic field diffusion outward, so that magnetic field only acts on the magneto-rheological fluid in liquid storage cylinder.

A method for preparing magnetic lignin-carbon composite materials for electromagnetic shielding belongs to the field of biomass carbon-based electromagnetic functional composite material preparation technology. The method involves in-situ polymerization to coat lignin powder with a polymer-based magnetic particle inducer layer such as polyaniline to obtain an intermediate; subsequently, a uniform and stable loading of Fe, Co, and Ni magnetic particles is achieved through in-situ growth of MOF particles or metal salt solution modification and impregnation processes; finally, high-temperature carbonization yields magnetic lignin-carbon. This invention effectively solves the technical problems of easy aggregation of magnetic particles and weak interfacial bonding by utilizing the abundant active sites provided by the inducer layer, enabling the resulting composite material to possess both the electrical conductivity loss of carbon-based materials and the hysteresis loss of magnetic particles, forming a highly efficient magnetic-electric synergistic loss mechanism. The magnetic lignin-carbon of this invention achieves an average shielding effectiveness of up to 77.5 dB in the 2-18 GHz band, showing broad application prospects in fields such as electromagnetic protection of electronic equipment and military stealth.

A magnetic resonance imaging (MRI) device (100) includes an electrically superconductive coil having an opening to receive a subject, and a magnetically-actuated contactor 306. The magnetic contactor (306) has a ferromagnetic plunger (320) and a ferromagnetic yoke (302) disposed over the ferromagnetic plunger (320). The ferromagnetic yoke (302) has four sides, with two of the four sides (312, 316) have substantially less surface area than the other two of the four sides. An external magnetic field is oriented to be substantially perpendicularly to the two sides (312,316) having substantially less surface area.

Magnetic shields 82a, 82b are formed from conductor patterns of a substrate 8. Hence, the magnetic shields 82a, 82b can be formed thin. Thus, even when a displacement member 7 (detection part 75) is displaced substantially in parallel with the substrate 8, key pressing information based on the increase / decrease of inductance of a coil 80 can be detected while suppressing interference of the magnetic shields 82a, 82b with the displacement of the displacement member 7. Also, even when the displacement member 7 (detection part 75) is displaced perpendicularly to the substrate 8, the key pressing information based on the increase / decrease of the inductance of the coil 80 can be detected. Thus, the degree of design freedom of a keyboard instrument 1 is increased. Further, constraints can be suppressed from being imposed on the arrangement of the substrate 8 by forming the magnetic shields 82a, 82b to be thin from the conductor patterns. This also increases the degree of design freedom of the keyboard instrument 1.

This invention provides a film that combines thermal conductivity, thermal insulation, and electromagnetic shielding. It includes a high thermal conductivity film, a phase change film, and a thermally insulating electromagnetic shielding film. The high thermal conductivity film and the thermally insulating electromagnetic shielding film are respectively disposed on both sides of the phase change film. The thickness of the high thermal conductivity film is 0.01–0.5 mm; the thickness of the phase change film is 0.1–1 mm; and the thickness of the thermally insulating electromagnetic shielding film is 0.05–1.5 mm. This invention, combining thermal conductivity, thermal insulation, and electromagnetic shielding, can effectively solve the problem of poor heat dissipation in electronic devices such as mobile phones under high load, while reducing the impact of electromagnetic radiation on users. The product is lighter, thinner, and more flexible; the entire film product can be completely folded without material breakage.

This invention provides a highly stable magnetometer array mounting structure for underwater magnetic field target detection, relating to the field of underwater detection technology. It includes an underwater platform carrier mounting base, which is connected to a middle frame via a connector. A magnetic shielding plate is provided on the connector between the connector and the middle frame. The middle frame includes a frame body, with mounting holes on both short sides. These mounting holes are connected to slide rails via bolts. This invention, through its designed connector, reduces the efficiency of vibration transmission between the underwater platform carrier and the frame body, thereby improving the overall structure's impact resistance and adaptability. This ensures the magnetometer probe remains stable in dynamic underwater environments, reducing measurement errors caused by mechanical vibration. Simultaneously, the magnetic shielding plate effectively isolates stray magnetic fields generated by the platform carrier, enhancing detection accuracy and reliability.

The application relates to the technical field of laser detection tooling, and particularly discloses a thickness detection mechanism for an electromagnetic shielding sputtering film coating layer, which comprises a rack and a machine shell fixed to the outer side of the top end of the rack; further comprises a lifting plate which is installed in the middle part of the inner side of the machine shell in a lifting manner through a lifting adjusting mechanism, a first rotating disc is rotatably installed on the inner side of the lifting plate, and the top surface of the first rotating disc is fixed with two groups of upper laser measuring assemblies; a fixing frame is installed on the middle part of the top surface of the rack in a sliding manner through a sliding adjusting mechanism, a second rotating disc is rotatably installed on the inner side of the fixing frame, and the bottom surface of the second rotating disc is fixed with two groups of lower laser measuring assemblies corresponding to the upper laser measuring assemblies. The thickness detection mechanism for the electromagnetic shielding sputtering film coating layer can be adaptively adjusted and matched, can be used in sample and continuous detection double scenes through double-face synchronous laser measurement and rotating adjustment, and can complete coating thickness detection with high precision and high efficiency.

The application provides a coil unit and a coil array, comprising a coil body and a magnetic shielding layer; the coil body is configured to allow a current flowing therethrough to form a current loop, and the coil body comprises at least a first wire segment, a second wire segment and a third wire segment connected in sequence; the first wire segment and the third wire segment both extend along a first direction and are spaced apart along a second direction; the second wire segment extends along the second direction; and the first direction and the second direction are arranged transversely; the magnetic shielding layer has a thickness dimension along the second direction; at least part of the thickness of the magnetic shielding layer along the second direction is located between the first wire segment and the third wire segment; and the second wire segment passes through at least part of the thickness of the magnetic shielding layer along the second direction.

This application provides a magnetic device and a power conversion device, relating to the field of magnetic device technology. In the power conversion device, the magnetic device is disposed on one side of a circuit board. The magnetic device includes a first winding, a magnetic core post, and a plastic magnetic component. The first winding includes an insulating layer wrapped around its surface and wound around the outside of the magnetic core post. The plastic magnetic component covers the magnetic core post and part of the first winding, and fills the space between the magnetic core post and the first winding. The plastic magnetic component is stacked with the circuit board, and the end of the first winding is exposed outside the plastic magnetic component and electrically connected to the circuit board. The magnetic device is encapsulated by the plastic magnetic component, facilitating miniaturization design. The plastic magnetic component can magnetically shield the first winding, which helps reduce magnetic losses. The insulating layer can ensure high withstand voltage insulation of the first winding and improve the stability and reliability of the first winding during the processing of the magnetic device.

This utility model discloses an electronic working switch, a magnetic particle flaw detector starting circuit, and a magnetic particle flaw detector. The electronic working switch includes: a switch housing, a magnetic field sensor, a magnetic structure, and a magnetic shielding structure. The switch housing has an accommodating space for accommodating the magnetic shielding structure. The magnetic field sensor is disposed on the side wall of the switch housing, and the magnetic structure is disposed on the side wall and opposite to the magnetic field sensor. The magnetic shielding structure is slidably disposed in the accommodating space inside the switch housing to isolate the magnetic field between the magnetic structure and the magnetic field sensor. The electronic working switch in this application converts the positional change of the magnetic shielding structure relative to the magnetic field sensor into a change in the working signal output of the working switch, reducing wear and failure problems caused by mechanical contact and improving measurement accuracy and stability.

The application relates to a nanocrystalline soft magnetic and superstructure comb-based NV color center current sensor packaging protection structure. A stress buffer layer is arranged to relieve cyclic thermal stress generated between different materials due to differences in thermal expansion coefficients, avoid structural cracking and delamination failure, and improve vertical heat conduction efficiency through a heat conduction through hole of the substrate, quickly dissipate high heat flux heat, and realize multi-dimensional electromagnetic shielding through a multiple physical shielding shell. The problems of thermal stress accumulation failure, insufficient heat dissipation causing measurement performance degradation, and imperfect electromagnetic shielding leading to measurement precision instability are effectively solved, and the environmental adaptability, service life, measurement precision and stability of the current sensor are improved.