68 results about "Permalloy" patented technology

The invention discloses an information acquisition and transmission system of track control equipment, which relates to the technical field of track traffic intelligent monitoring and comprises an intelligent sensing terminal, an edge intelligent analysis node, a safety communication module, a central control platform, a digital twin diagnosis center and a predictive maintenance engine. According to the invention, the intelligent sensing terminal integrates various sensors, adopts a permalloy shielding cavity to isolate external electromagnetic interference, is equipped with a three-stage lightning protection circuit to realize microsecond-stage lightning surge protection, can stably collect parameters of track control equipment in a severe environment, is internally provided with a lightweight LSTM model, carries out preliminary filtering analysis on original data, and is used for monitoring the parameters of the track control equipment. The device operation state can be dynamically identified, the sampling strategy can be adjusted, the basic sampling frequency is maintained in the stable state to reduce power consumption, the sampling frequency is improved by 10 times and the sensor gain is enhanced in the early warning or emergency state, all analysis decisions are completed at the local millisecond level without depending on the cloud, and the real-time performance and accuracy of data processing are effectively improved.

The invention discloses a multi-layer protection cable resistant to an extreme environment, and belongs to the technical field of cables. The cable is of a seven-layer composite structure design and sequentially comprises a conductor, an insulating layer, a shielding layer, a buffer layer, a waterproof layer, a heat insulation layer and a protective outer layer from inside to outside, and the conductor is made of high-purity oxygen-free copper; the insulating layer is made of a polyimide material and has high temperature resistance, low temperature resistance and excellent insulating property; the shielding layer is composed of a tinned copper wire woven mesh and a high-permeability permalloy foil, and electromagnetic interference is effectively shielded; the buffer layer is made of an elastic rubber material to relieve mechanical stress; the waterproof layer adopts a nanoscale fluorosilicone resin coating and has excellent waterproof performance; the heat insulation layer is made of ceramic fibers and aerogel, and efficient heat insulation is provided; and the protective outer layer is made of a high-strength and corrosion-resistant polyether-ether-ketone (PEEK) material. The cable has excellent high temperature resistance, low temperature resistance, corrosion resistance and electromagnetic interference resistance, is suitable for extreme environments, and ensures stable transmission of electric power and signals under extreme conditions.

The invention discloses an energy-saving direct-current converter transformer, and particularly relates to the technical field of direct-current converter transformers, and the energy-saving direct-current converter transformer comprises a heat dissipation shell, a controller, a plurality of groups of winding coils, an iron core and a linkage magnetic flux leakage processing assembly, the linkage magnetic flux leakage processing assembly comprises an electric cylinder, a push block, a linkage strip, two inclined grooves, a sleeving column, a guide column, a permalloy outer cover and a connecting strip. Through linkage of the magnetic flux leakage processing assembly, the direct current converter transformer has the advantages that the magnetic flux leakage problem of a large-area area outside the winding coils can be timely processed, the magnetic flux leakage amount can be effectively reduced, the eddy current loss is reduced, the energy loss of the winding coils is remarkably reduced, and the energy-saving performance of the direct current converter transformer is improved; therefore, the problem that the energy-saving performance of the direct-current converter transformer is remarkably reduced due to the fact that the leakage flux in a large-area area is difficult to handle in time and large eddy-current loss is caused by the leakage flux in the transformer is solved.

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.

A 46950 type lithium battery digital pointer type power bank comprises a front digital panel frame, a shell, a 46950 type lithium battery, a digital pointer driving machine core, a PCB circuit board A and a PCB circuit board B. The most substantial improvement is that the embarrassment that mobile phone power banks in the market are all in the same form is changed at one stroke, and through a three-function rib head button and a single high-power 46950 type lithium battery, the mobile phone power bank can be connected with the mobile phone power bank in a one-stroke mode. 4C fast charging of a mobile phone can be supported, and charging can be carried out from 10% to 70% within 9 minutes; besides, the digital pointer driving machine core is modularized in the digital pointer type power bank, and the iron core body in the digital pointer driving machine core is made of an iron-based amorphous alloy material instead of a permalloy material, so that the digital pointer type power bank has higher corrosion resistance than the permalloy material, and is an excellent soft magnetic material capable of remarkably reducing iron loss; due to the improvement, the driving voltage of the micro stepping motor is also greatly reduced; therefore, the product is wide in market application and development prospect.

There is provided a performance testing and evaluation method for a permalloy material for construction of a magnetically-shielded room and relates to testing and evaluation on alloy shielding performance. The present disclosure aims to solve the problem of failure to satisfy the requirements of different application scenarios for the magnetic field shielding due to lack of in-depth research on the shielding effect of the current permalloy in the magnetically-shielded rooms. The method includes: at step 1, selecting a permalloy sample, and conducting quality inspection on the sample to ensure the sample is compliance with an experiment requirement; at step 2, setting up an experimental apparatus; where the permalloy sample is vertically placed, and a magnetic field generation coil and a magnetic field measuring sensor are respectively placed at left and right sides of the permalloy sample; at step 3, carrying out shielding performance testing and evaluation on the permalloy sample.

In an example, a Hall sensor can include an IC die formed on a lead frame that is configured to conduct a current, the IC die being configured to sense a magnetic field resulting from the current. The Hall sensor can include at least one magnetic permeability material film formed on the IC die. The Hall sensor can include at least one permalloy material layer formed on the respective at least one magnetic permeability material film, the at least one magnetic permeability material film and the at least one permalloy material layer combining to provide a magnetic concentrator providing concentration of the magnetic field.

This invention discloses a method for fabricating a non-magnetic spatial reticulated shell structure composed of carbon fiber sheets. The load-bearing components of this reticulated shell structure are made of non-magnetic carbon fiber, while the connecting nodes are made of non-magnetic titanium alloy. A magnetic shielding layer is arranged in the roof system above the structural layer, creating a non-magnetic space with a magnetic field strength below 1 nT inside the reticulated shell. Specifically, the load-bearing components are made of carbon fiber sheets, fixed by two carbon fiber limb plates in an interlimb connection to form a hollow rectangular composite section. The connecting nodes consist of titanium alloy node plates, titanium alloy bolt groups, and carbon fiber limb plates. The magnetic shielding layer of the roof system consists of a shielding layer pad, a shielding layer, a shielding layer pressure plate, a buffer layer, a permalloy plate, and pressure strips. This invention features lightweight, high strength, and non-magnetic properties, creating a near-zero residual magnetism space through the roof magnetic shielding layer. It can be applied to various functional buildings with high magnetic field shielding requirements, as well as to general construction engineering.

The application discloses a kind of magnetic field shielding method and device of mechanical pump electron beam welding, based on the simulation analysis of the magnetic field distribution at the weld of mechanical pump, according to the shape of mechanical pump, iterative design magnetic field shielding device, adopt high permeability permalloy to make " two half splicing " type double shielding structure, the splicing seam of inside and outside two shielding layers is 90 ° angle, installed in the periphery of mechanical pump, in the premise of not changing the performance of mechanical pump itself, not transforming electron beam welding equipment realizes beam current no deflection in the process of mechanical pump electron beam welding, realizes the precision welding of mechanical pump.

The application relates to the technical field of magnetic materials, and particularly discloses a production process of a permalloy CT energy-taking magnetic core suitable for small-current starting, which comprises strip preparation, surface coating, spiral molding, hot pressing diffusion and gradient heat treatment. The application adopts a spiral sheet structure thin strip as a magnetic core raw material for the first time, combines a PVD coated metal plating layer of inner Mo and outer Cr, designs a Cr-Mo-Cr gradient coating and subsequent heat diffusion, forms an outer hard inner lead structure, and the structure has diffusion and progressive layers in height, solves the contradiction between the soft magnetic lead and high hardness of the existing magnetic core, realizes metallurgical bonding between strip layers through a hot pressing diffusion process, and the product has excellent mechanical strength and interlayer bonding force; through accurate alloy component design and gradient heat treatment, the product has ultrahigh magnetic performance and extremely low starting current: mu i > 60,000, H c < 0.73 A / m, starting current < 0.5 mA.

The invention discloses an active and passive combined zero magnetic device and a design method, and belongs to the field of magnetic shielding. The active and passive combined zero magnetic device comprises a passive shielding cabin composed of multiple layers of permalloy, and an equal-interval structure is arranged between every two adjacent layers; provided is a demagnetization system. The permalloy has high magnetic permeability, when a magnetic field encounters the permalloy with high magnetic permeability, magnetic field lines tend to spread along a path with higher magnetic permeability, namely walk along a permalloy layer instead of penetrating through a material, so that the environmental magnetic field is further reduced, a near-zero magnetic field environment is realized by designing a multi-layer permalloy cabin structure, and the performance of the magnetic field is improved. The demagnetizing coil is wound on the inner side wall and the outer side wall of the permalloy cabin body, and the demagnetizing coil is communicated with the external demagnetizing equipment through the demagnetizing interface at the end part of the demagnetizing coil, so that the amplitude of the demagnetizing current is gradually attenuated to the demagnetizing coil, and the permalloy cabin body is demagnetized; and the magnetization intensity of the material caused by the influence of the external environment and irresistible stress in the processing process can be weakened through the demagnetizing coil.

The utility model relates to the technical field of sensors, in particular to a miniature passive wireless sensor applied to temperature measurement of a high-speed motor rotor, which comprises a temperature sensing unit, a flexible connecting unit and a transmitting unit, and is characterized in that the temperature sensing unit comprises a surface acoustic wave resonator chip, a matching element and a temperature sensing end welding point; the transmitting unit comprises a spiral antenna unit, a fixed base and a transmitting end welding point. A first shielding layer, a second shielding layer and a third shielding layer are arranged, the first shielding layer and the second shielding layer which are good in conductivity are used for manufacturing a shielding cover and the like to surround an emission unit, a high-frequency magnetic field generates induction current on the surface of a metal shielding body, and a reverse magnetic field generated by the current can counteract part of an external magnetic field; and the first shielding layer is made of a permalloy plate, has high magnetic conductivity and can guide magnetic field lines to pass through the shielding layer, so that the magnetic field intensity of the space where the internal emission unit is located is greatly reduced.

The permalloy plate winding drum device comprises a base, the two ends of the top face of the base are fixedly connected with a pre-bending assembly and a shaping assembly respectively, and the pre-bending assembly and the shaping assembly are arranged oppositely; the shaping assembly comprises two first supporting legs, mounting cylinders are fixedly connected to the top surfaces of the two first supporting legs correspondingly, a plurality of sliding grooves are formed in the opposite side faces of the two mounting cylinders correspondingly, sliding plates are slidably connected into the two opposite sliding grooves, and the outer side faces of the sliding plates are of an arc-shaped structure; one end of the sliding plate is in transmission connection with a driving assembly which is arranged in an inner cavity of the mounting cylinder and fixedly connected with the base. The permalloy plate winding device is simple in structure, convenient to operate and good in winding effect, the diameter of a wound cylinder can be accurately adjusted, and the production and processing requirements of permalloy plates are met.

The utility model belongs to electric box shielding technical field especially is a kind of power distribution box shielding protection device of anti-electromagnetic interference, including electric box, the front end of electric box is hinged with cabinet door by hinge, the bottom of electric box is fixedly connected with reinforcing seat, the sidewall of electric box is equipped with several ventilating grooves, the sidewall of electric box is equipped with several air flue, and heat dissipation fan is fixedly installed on the inner wall of electric box on air flue, the inner sidewall of electric box is fixedly connected with bracket.The utility model, electric box is composed of permalloy, plated copper honeycomb, aluminium sheet layer, inner wall is coated with epoxy resin paint, cabinet door is sealed with mechanical lock, bottom has "mouth" type reinforcing seat support, sidewall is equipped with ventilating groove, air flue and six different wind direction heat dissipation fan heat dissipation, rear sidewall incoming and outgoing line hole has gravity closure round cover, can prevent electromagnetic interference in full frequency band, give consideration to heat dissipation, dustproof and waterproof, structure is stable, and it is convenient to install maintenance.

The utility model discloses a broadband track double-body mutual inductor. The broadband track double-body mutual inductor comprises a first current transformer and a second current transformer, according to the utility model, the first current transformer and the second current transformer are arranged to be of an integrated structure and are in a double-ring 8 shape, so that the current of two paths of moving tracks can be measured at the same time, the overall size is reduced, the problem of small installation space is solved, the installation is simple and convenient, and the monitoring cost is reduced; and an annular magnetic core in the current transformer is a permalloy magnetic core and has a high-frequency characteristic, so that broadband measurement is realized, and the power of the mobile locomotive in the running process is monitored.

There is provided a performance testing and evaluation method for a permalloy material for construction of a magnetically-shielded room and relates to testing and evaluation on alloy shielding performance. The present disclosure aims to solve the problem of failure to satisfy the requirements of different application scenarios for the magnetic field shielding due to lack of in-depth research on the shielding effect of the current permalloy in the magnetically-shielded rooms. The method includes: at step 1, selecting a permalloy sample, and conducting quality inspection on the sample to ensure the sample is compliance with an experiment requirement; at step 2, setting up an experimental apparatus; where the permalloy sample is vertically placed, and a magnetic field generation coil and a magnetic field measuring sensor are respectively placed at left and right sides of the permalloy sample; at step 3, carrying out shielding performance testing and evaluation on the permalloy sample.

The invention discloses a variable range magnetic sensor based on a magnetic shielding effect and application, the variable range magnetic sensor comprises a magnetic shielding sleeve, a printed circuit board and a magnetoresistance sensing chip, the magnetic shielding sleeve is embedded in the printed circuit board, and the magnetoresistance sensing chip is arranged on the printed circuit board and located in the magnetic shielding sleeve. A single-layer double-opening permalloy magnetic shielding sleeve is nested on a PCB (Printed Circuit Board), and a magnetoresistance sensing chip is arranged in the magnetic shielding sleeve. The structure is designed to be used for increasing the measuring range of the magnetoresistance sensing chip, and dynamic adjustment of the measuring range of the sensor is achieved by adjusting the position and the thickness of the magnetic shielding sleeve. The sensor described by the invention can be better applied to a scene with a wide dynamic magnetic field range, and has better nonlinearity and anti-interference capability.

The utility model discloses an electromagnetic shielding type capacitor, and particularly relates to the technical field of capacitors, the electromagnetic shielding type capacitor comprises a main body mechanism and a connecting assembly, the outer diameter surface of the main body mechanism is provided with the connecting assembly, and the main body mechanism comprises a shielding assembly, a capacitor assembly and a cover plate assembly. The electromagnetic shielding type capacitor comprises a capacitor assembly, a shielding assembly is placed on the outer diameter surface of the capacitor assembly, a cover plate assembly is installed on the side face of the shielding assembly, an electromagnetic shielding layer is additionally arranged on the electromagnetic shielding type capacitor through the shielding assembly, and a metal shell of the capacitor is made of permalloy with the electromagnetic shielding performance. External electromagnetic interference can be effectively prevented from entering the capacitor, electromagnetic radiation generated by the capacitor is limited to a certain degree, and interference to other surrounding electronic elements and circuits is reduced.

The invention discloses a preparation method for improving the initial permeability of permalloy, which is based on Fe-Ni-Mo permalloy and adopts a ternary synergistic process of electron beam smelting, ultra-large cold rolling deformation and magnetic field heat treatment. The permalloy strip with the ultrahigh initial permeability is prepared through the method, three microscopic barriers including an impurity pinning barrier, a grain boundary and defect barrier and an intrinsic magnetic barrier which limit the magnetic performance of permalloy are overcome, the permalloy strip with the ultrahigh initial permeability is obtained, and the method has the advantages of being simple in process, low in cost, easy to produce in batches and the like, and can well meet the requirements of high-end electromagnetic elements.

The invention relates to a Hall sensor with a magnetic concentrator. In an example, a Hall sensor (104) may include an IC die (108) formed on a lead frame (102) configured to conduct a current, the IC die (108) configured to sense a magnetic field generated by the current. The Hall sensor (104) may include at least one film (112) of magnetically conductive material formed on the IC die (108). The Hall sensor (104) may include at least one layer of permalloy material (114) formed on a respective at least one film of magnetically conductive material (112), the at least one film of magnetically conductive material (112) and the at least one layer of permalloy material (114) in combination to provide a magnetic concentrator (110) that provides concentration of the magnetic field.

The application discloses a current overload protection method for an electric jack circuit board, and the protection method comprises the following steps: S1, magnetic induction detection; S2, dynamic parameter calculation; S3, multi-stage overload response; and S4, self-recovery control. The four steps of magnetic induction detection, dynamic parameter calculation, multi-stage overload response and self-recovery control are cooperatively operated, the gap magnetic field detection technology of a radial magnetic pin and a Hall device is adopted, and the adjustable mounting seat is combined to realize 0.5-1.2 mm gap precision adjustment. The current overload protection is realized through a three-stage triggering mechanism: the first-stage response adopts a weak magnetic field of an inner layer winding of an electromagnetic coil to drive a bimetallic strip slow-break contact, the second-stage response realizes 0.1 second rapid power-off through a strong magnetic field of an outer layer winding, and the third-stage response is triggered by temperature to automatically cut off the bimetallic strip. The disturbance is eliminated by cooperating with a permalloy magnetic shielding cover, the deformation precision is improved by the arc-shaped compensation groove of the bimetallic strip, and the heat dissipation is enhanced by combining the 2oz copper thick copper-clad plate with the aluminum fin array, so that the response speed of the current overload protection of the circuit board is improved.

The invention relates to the technical field of environment monitoring vehicles, and provides an electronic instrument anti-electromagnetic interference assembly for a nuclear facility environment monitoring vehicle, which comprises a monitoring vehicle body, the top of the monitoring vehicle body is fixedly connected with a shielding bin, and the inner side of the shielding bin is fixedly connected with a plurality of permalloy square cylinders. Nitrogen filling cavities are formed between every two adjacent permalloy square cylinders, communicating holes are formed in the two sides of the multiple nitrogen filling cavities correspondingly, the bottom ends of the multiple nitrogen filling cavities are fixedly connected with gas guide pipes communicating with the interiors of the nitrogen filling cavities correspondingly, and the bottoms of the multiple gas guide pipes are fixedly connected with flow dividing pipes. A filtering mechanism for absorbing electromagnetic waves is arranged at the top end of the inner side of the monitoring vehicle body; and an air supply mechanism is arranged at the inlet end of the shunt pipe. Through linkage of triple technologies of composite electromagnetic shielding, dynamic filtering and nitrogen environment control, the interference suppression problem of a nuclear monitoring vehicle in a complex electromagnetic environment and under extreme temperature and humidity is solved, and the data precision and reliability of a gamma detector in a mobile monitoring scene are remarkably improved.

The invention relates to the technical field of silicone oil water pump production and welding, and particularly discloses a magnetism-isolating silicone oil water pump and a welding device thereof.The magnetism-isolating silicone oil water pump comprises a pump body, the pump body is made of aluminum alloy, a magnetism-isolating shell is further arranged in the pump body, a magnetism-isolating groove is formed in the magnetism-isolating shell, and a magnetism-isolating ring made of permalloy is arranged in the magnetism-isolating groove; and nickel foil transition layers are arranged on the inner and outer peripheral walls of the magnetic isolation groove. The welding device of the magnetism isolating silicon oil water pump comprises a machine body, two welding guns and a rotary lifting table arranged on the machine body, the two welding guns correspond to the inner side and the outer side of a magnetism isolating ring respectively, a clamping tool is detachably arranged on the rotary lifting table, and a first electromagnet opposite to the magnetism isolating ring is arranged on the machine body and located above the clamping tool. The machine body is provided with a cooling mechanism used for cooling the magnetism isolating ring and a detection assembly used for detecting the magnetic permeability of the magnetism isolating ring. The magnetic isolation ring has the effects of reducing the welding difficulty and improving the guiding magnetic circuit of the magnetic isolation ring.

The invention discloses a high-power switching power supply device applied to a static magnetic field. The device adopts a four-stage protection system, wherein the first stage is a double-nested structure shell formed by attaching a pure iron plate and permalloy through conductive silicone grease, and overall efficient magnetic shielding is achieved; the second stage is a local reinforced shielding chamber which is internally made of a pure iron plate and is used for carrying out secondary isolation on the control and power module; the third stage adopts at least two LLC power modules which are connected in parallel and are symmetrically arranged, and the static magnetic field influence is inhibited from the source through magnetic field offset; and the fourth stage carries out fine management on the opening and the gap through a magnetic shielding waveguide tube and a magnetic conductive sealing strip. The control system adopts an optical fiber and a shunt for sampling, and CAN communication and current sharing control are combined, so that the signal accuracy and the system stability are ensured. The problems of loss increase, control instability and the like caused by magnetic saturation of a high-power switching power supply in a static magnetic field environment are solved, and high-reliability and high-power direct-current conversion output in a strong static magnetic field environment is realized.

The utility model discloses a signal monitoring device for the steering angle of a forklift, belonging to the field of sensors and measurement technology. Aiming at the problem that the angle detection device in the prior art is vulnerable to external interference, the signal monitoring device for the steering angle of a forklift of the utility model uses the U-shaped permalloy structure of the magnetic isolation cover to shield the non-working side of the magnetic pole array, only exposing the bottom magnetic field, completely isolating interference and doubling the effective magnetic flux density; multiple pairs of NS alternating magnets are arranged in a ring and the pole pitch matches the width of the Hall sensor, realizing sensitive capture of micro-steering of ±1°. The linkage design of the insertion block and the slot is combined with the rotary support of the circular groove at the bottom of the turntable to eliminate wear and accurately transmit torque; the double O-ring IP67 seal and the base shock-absorbing layer cooperate to resist oil, moisture and impact. As a whole, it provides a highly reliable and maintenance-free signal source for forklift steering control.

The magnetic shielding device based on the low magnetic noise and high shielding performance of the permalloy-ferrite-superconducting coil can provide a stable extremely low magnetic noise weak magnetic environment for an ultra-high sensitive SERF magnetic field and inertial measurement device, mainly composed of a permalloy magnetic shield, a ferrite magnetic shield, a superconducting coil magnetic shield support, a non-metallic dewar, a superconducting coil winding disc and an adjustable stud, etc., the ferrite magnetic shield is placed in the permalloy magnetic shield cavity, the superconducting coil magnetic shield support is placed in the ferrite cavity, the non-metallic dewar is placed on the superconducting coil magnetic shield support, and the superconducting coil winding disc is placed in the non-metallic dewar cavity, by combining the active magnetic shielding of the superconducting coil with the traditional passive magnetic shielding of the permalloy-ferrite, the problem that the magnetic noise of the traditional magnetic shielding material is difficult to further reduce is overcome, and the magnetic noise of the device is further reduced, and the sensitivity of the SERF magnetic field and inertial measurement device limited by the magnetic noise of the magnetic shielding itself can be greatly improved.

The present invention discloses a non-contact magnetoelectric composite current sensor with magnetic concentration and magnetic shielding. The sensor core consists of a magnetoelectric sensing element, a magnetic fluid layer, a magnetic concentration structure and a magnetic shielding layer. The magnetoelectric sensing element adopts a manganese-doped lead magnesium niobate and an amorphous alloy film composite material. The outer side of the sensing element is coated with a magnetic fluid layer made of a soft magnetic composite material. The magnetic concentration structure adopts a high magnetic permeability Permalloy material and is divided into two parts, the upper part accommodates the sensing element and the magnetic fluid layer, and the lower part is provided with a standardized groove for placing the conductor to be measured. The outermost layer is a magnetic shielding layer composed of multiple layers of nanocrystalline alloy strips, which also adopts an upper and lower split design, and is ensured to fit closely with the magnetic concentration structure through precision processing. The upper and lower magnetic shielding layers are connected in a detachable manner to facilitate on-site installation. The overall structure is compact and there is no need to disconnect the circuit during installation. It is particularly suitable for online current monitoring needs in the fields of smart grids, industrial automation, etc.

The invention discloses a self-shielding coil design method based on a finite element method, relates to the technical field of high-precision magnetic field control, and solves the problems that when a compensation coil is designed in a closed magnetic shielding structure (such as a permalloy cylinder), the external stray magnetic field of the coil is coupled with the wall of the magnetic shielding cylinder to induce eddy current, so that the compensation magnetic field is distorted, and the background noise is increased. Meanwhile, high-precision magnetic field generation of a target area needs to be realized in a limited space. According to the technical scheme, finite element triangular mesh discretization is carried out on the surfaces of a main coil and a shielding coil; constructing a target function; and solving the minimum value of the function to obtain the optimal solution of the flow function psi of all grid nodes, calculating the current density of each triangular grid unit according to the optimal solution, and finally generating a closed-loop wire wiring structure of the main coil and the shielding coil along an equal-flow function line. The method is mainly used for scenes, such as a biological magnetic measurement system, magnetic resonance imaging and the like, which are limited in space and need to suppress external magnetic field coupling, and collaborative optimization of a high-precision target magnetic field and active self-shielding is realized.

The invention relates to the technical field of current transformers, in particular to a wide-range current transformer. The transformer comprises an iron core, a winding, a multi-layer electromagnetic shielding layer and a shell, the winding is wound on the iron core, the multi-layer electromagnetic shielding layer is arranged around the iron core and the winding, and all the parts are fixedly installed in the shell. The iron core is made of customized ultracrystalline alloy through winding, transverse magnetic treatment and vacuum annealing, the machining error is controlled within + / -5 microns, the magnetic performance is excellent, and the high-temperature stability is high; the winding is made of high-purity oxygen-free copper enameled wires and is wound in a layered, segmented and nanoscale precision mode, and polyimide films are arranged between layers for insulation. The multiple electromagnetic shielding layers are of a composite structure of permalloy on the inner layer and copper on the outer layer, and full-band interference resistance is achieved through collaborative optimization. According to the invention, high-precision measurement is realized in a rated current range of 10%-200%, and the device is suitable for electric energy metering, new energy power generation and other scenes, and has the characteristics of accurate measurement, good stability, strong interference resistance and excellent dynamic response.

The invention discloses an anti-interference stable partial discharge sensor. The anti-interference stable partial discharge sensor comprises a rear shell, the front cover is mounted on the front surface of the rear shell; a shielding assembly is arranged in the front cover and comprises a conductive layer, a permalloy middle layer and a copper lining layer which are sequentially arranged in a sleeved mode from outside to inside, in the using process, a high-frequency electromagnetic field is shielded through the conductive layer, the permalloy middle layer is made of a high-permeability magnetic material and can shield a low-frequency magnetic field, the copper lining layer further absorbs residual electromagnetic waves, and the shielding effect is good. The three are separated through the first particle mixing layer, so that eddy current interference caused by an electric continuum formed by direct contact is avoided, and vibration attenuation is realized at the same time; the three shielding layers are arranged in the sensor shell, the two independent cavities are formed and filled with the heavy metal damping particles and the soft magnetic absorption particles respectively, a cooperative anti-interference system is constructed, the heavy metal particles in the inner cavity are mixed with the viscous medium, and mechanical vibration energy can be efficiently absorbed through inertia friction.