96 results about "Low magnetic field" patented technology

The invention relates to a Fe-Si-Nb-B-Cu-Er amorphous alloy and a preparation method and application thereof, and belongs to the technical field of metal materials. The atomic percent expression of the Fe-Si-Nb-B-Cu-Er amorphous alloy disclosed by the invention is (Fe < 83 > Si < 3 > Nb < 4 > B < 9 > Cu < 1 >) < 100-x > Er < x >, wherein x is equal to 3.5 to 4.5. The rare earth element Er is added to optimize the soft magnetic performance of a Fe-Si-Nb-B-Cu amorphous alloy system, the coercive force of the Fe-Si-Nb-B-Cu amorphous alloy system is reduced, the preparation method is simple and easy to implement, and the Fe-based amorphous alloy with the excellent soft magnetization performance is obtained. The magnetization intensity of the amorphous alloy is sharply increased along with increase of a magnetic field under a low magnetic field and then gradually reaches saturation, typical soft magnetic performance is presented, and the amorphous alloy has wide application space in the field of magnetic materials.

The embodiment of the invention discloses a scanning NV probe microscope which comprises an atomic force microscopy system used for detecting surface topography information of a sample and an optical detection magnetic resonance system used for detecting surface magnetic field distribution information of the sample, and the atomic force microscopy system comprises a vibration arm and a diamond probe. The optical detection magnetic resonance system comprises an NV color center, a transition excitation light path and a fluorescence detection light path; a sample to be scanned and the transition excitation light path are respectively positioned on two opposite sides of the diamond probe, and the transition excitation light path and the fluorescence detection light path are positioned on the same side of the diamond probe; a first metal coating film is arranged on one side, close to the sample, of the diamond probe and is used for blocking surface fluorescence of the sample. According to the scanning NV probe microscope provided by the embodiment of the invention, the metal coating is arranged at the bottom of the diamond probe to block stray fluorescence from the surface of the sample, so that the problems of low magnetic field imaging signal-to-noise ratio and limited measurement precision of the existing scanning NV probe microscope are solved.

The invention provides a 90-degree Halbach array-based magnetic coupler for a reaction kettle, which comprises a sealing cover cylinder, an outer magnet support sleeve is rotatably connected to the outer side of the sealing cover cylinder, a plurality of outer magnets are arranged on the outer magnet support sleeve, an inner magnet support sleeve is rotatably connected to the inner part of the sealing cover cylinder, and a plurality of outer magnets are arranged on the inner magnet support sleeve. A plurality of outer magnets are arranged on the outer magnet supporting sleeve, a plurality of inner magnets are arranged on the inner magnet supporting sleeve, the outer magnets and the inner magnets are arranged according to a 90-degree Halbach array, the outer magnets are arrayed according to the fact that the magnetic induction intensity of the inner sides of the outer magnets is enhanced by the 90-degree Halbach array, and the inner magnets are arrayed according to the fact that the magnetic induction intensity of the outer sides of the inner magnets is enhanced by the 90-degree Halbach array. The invention further provides an optimal design method of the magnetic coupler, and an optimal design combination is found by adopting a multi-target parameterization optimal design method. The invention solves the technical problems of low magnetic field intensity between air gaps, low magnetic steel utilization rate, low maximum transmission torque and low design and development method efficiency of the existing magnetic coupler, and belongs to the technical field of magnetic drive reaction kettles.

The invention discloses a magnetic field chip design method based on a genetic algorithm, and the method comprises the steps: setting genetic algorithm parameters, and setting magnetic field chip target parameters according to actual application demands; generating an initial population, wherein the initial population is a plurality of groups of individuals containing coil parameters; checking constraint conditions of the individuals, wherein the constraint conditions comprise physical constraints and design constraints; the power consumption generated by the coil structures corresponding to the individuals meeting the constraint conditions serves as a fitness function, and the fitness of all the individuals in the current population is evaluated; and judging whether a termination condition is met or not, outputting an individual with the optimal fitness as an optimal combination of coil parameters under the target parameters of the magnetic field chip when the termination condition is met, otherwise, generating a next-generation population, and repeatedly carrying out constraint condition check and fitness evaluation until the termination condition is met. According to the method, the magnetic field chip with the minimum power consumption meeting the magnetic field target can be designed, the design time of the magnetic field coil is greatly shortened, and the design rapidity and flexibility are improved.

The present application is drawn to a system and method, as well as method for manufacture of a device and system for determining the position and orientation of at least one magnetic field sensor comprising: a rigid structure comprising an array of at least five electromagnetic coils; at least one wire that connects to and powers the electromagnetic coils; wherein the placement and orientation of the electromagnetic coils on the rigid structure are predetermined; wherein the electromagnetic coils, each having a predefined magnetic moment per unit current, are constructed with a printed circuit board (PCB) comprising at least one conductive layer; and wherein the system is configured such that a stray magnetic field emanating from the at least one, as measured at the location of the at least one magnetic field sensor, generates substantially lower magnetic field intensity than that produced by each of the at least five electromagnetic coils.

The utility model relates to copper wire production technical field, concretely relates to a kind of copper wire production and processing's stretching device, including lubricating bucket and the conveying part for being immersed into the copper wire in lubricating bucket;Electromagnetic rod is located in lubricating bucket, it includes the sealing sleeve coaxially fixed in lubricating bucket and the electromagnetic coil coaxially located in sealing sleeve, for generating strong magnetic field and drive copper powder to the arc-shaped inner wall of lubricating bucket, fishing part is located in lubricating bucket, it includes the fishing ring coaxially slidingly located in lubricating bucket, the outer edge of the fishing ring contacts the inner wall of lubricating bucket.The utility model generates strong electromagnetic field by electromagnetic rod, since copper powder belongs to inverse magnetic material, it generates induced eddy current in alternating magnetic field, and then generates reverse magnetic field, forms repulsion with magnetic field source Lorentz magnetic force and is pushed to low magnetic field area by magnetic repulsion, copper powder can be pushed to the arc-shaped inner wall of lubricating bucket and gathered in real time, greatly extend the period of lubricating liquid cleaning or replacement, reduce its cleaning or replacement frequency.

A wearable device is disclosed. The wearable device may comprise: a speaker including a coil; a coin cell battery disposed on the speaker; and a conductive tab on a first surface of a case of the coin cell battery, the conductive tab being electrically connected to a portion of a first electrode positioned on the first surface of the case. The coin cell battery can include: the case that includes the first surface facing the speaker and a second surface opposite to the first surface; and a jelly roll. The conductive tab on the first surface of the case can extend in a second rotational direction opposite to the first rotational direction of the jelly roll so as not to overlap the coil of the speaker.

The invention provides a vehicle magnetic field interference shielding method, system and device, a storage medium and a product, and the method comprises the steps: measuring an interference magnetic field in a preset range of a magnetic field sensitive part through a three-axis magnetic sensor, and obtaining interference magnetic field data; wherein the interference magnetic field data comprises the intensity and the direction of the interference magnetic field; if the intensity of the interference magnetic field is greater than a preset safety intensity threshold value, controlling the magnetic field interference shielding device to generate an anti-interference magnetic field according to the interference magnetic field data so as to offset the interference magnetic field in a preset range of the magnetic field sensitive component; the direction of the anti-interference magnetic field is opposite to that of the interference magnetic field, and the intensity of the anti-interference magnetic field is consistent with that of the interference magnetic field. According to the scheme, the low-frequency strong magnetic field interference can be effectively eliminated while the magnetic field interference shielding cost is reduced, and the safety and reliability of the vehicle are improved.

To provide a magnetic shield device for shielding magnetism from the outside, which maintains a low magnetic field environment in the magnetic shield device (magnetic shield space) and reduces a fluctuation amount of a magnetic field by suppressing temperature fluctuation of the magnetic shield device itself causing magnetic field fluctuation (maintaining temperature stability).SOLUTION: The magnetic shield device 1 includes two or more layers of magnetic shield members 11,12, a thermally conductive member 13 which can accommodate a magnetic sensor and a test object therein, is disposed outside the innermost magnetic shield member 11, and is in thermal contact with substantially the entire surface of the innermost magnetic shield member 11, and a thermally conductive member temperature stabilizing means (here, a constant-temperature fluid 14, a constant-temperature fluid passage 15, a constant-temperature fluid delivery function, and a heat insulating layer 19) for maintaining the thermally conductive member 13 at a constant temperature.SELECTED DRAWING: Figure 2

The invention relates to the technical field of rheological testing and material characterization, and provides a local rheological testing system and device based on electromagnetic driving and visual displacement tracking, and the system comprises a magnetic field generation module which is used for generating a stable magnetic field for magnetizing a magnetic needle in a sample area and a periodic gradient magnetic field for driving the magnetic needle, and a driving module, the magnetic field generation module is used for providing corresponding steady-state and alternating current excitation for the magnetic field generation module, and the image acquisition module is used for generating a uniform linear magnetic field gradient in a central area by a gradient field Maxwell configuration coil pair and an external trigger synchronization mechanism through the arrangement of the structures such as the gradient field Maxwell configuration coil pair and the external trigger synchronization mechanism; the driving force acting on the magnetic needle is ensured to be stable and repeatable; an external trigger synchronization mechanism controls driving signals to be strictly synchronized with image acquisition, and magnetic needle displacement and phase difference are accurately extracted by combining image recognition and a sub-pixel positioning algorithm, so that magnetic field fluctuation and time sequence errors are effectively reduced, the rheological parameter inversion precision is improved, and the problems of large errors and high cost in the prior art are solved.

The invention relates to the technical field of magnetron sputtering equipment, in particular to a space type magnetic field assembly, an annular rotating cathode and magnetron sputtering coating equipment. At least four magnet base bodies are arranged, the space layout adjacent to the inner ring of a cooling pipeline is adopted, and at least one of the following adjustments is made on the end portions of the two ends of each magnet base body; the method comprises the following steps of: 1, adjusting, wherein the shape of the end part of the magnet base body is different from that of the middle part of the magnet base body; adjusting II, wherein the magnetizing process of the end part of the magnet base body is different from the magnetizing process of the middle part of the magnet base body; and 3, the magnet base body is sleeved with a magnet sleeve, the magnet sleeve at the end of the magnet base body is made of a gradient functional material, the magnetic conductivity difference of the material is utilized, on one hand, local etching of the end area of the target material is optimized, the utilization rate of the target material is increased, and on the other hand, the magnet sleeve abuts against the inner ring of the cooling pipeline, and magnetic field intensity attenuation is reduced.

The invention provides a neodymium iron boron magnet and a preparation method thereof. The method comprises the following steps: obtaining neodymium iron boron magnetic powder; the neodymium iron boron magnetic powder is put into the mold, and the neodymium iron boron magnetic powder is in a loose loading state in the mold; applying an alternating-current oscillation attenuation magnetic field to the neodymium-iron-boron magnetic powder in the mold; orientation profiling is conducted in a preset orientation static magnetic field, a pressed blank is obtained, and the magnetic field direction of the preset orientation static magnetic field is perpendicular to the magnetic field direction of the alternating-current oscillation attenuation magnetic field; and post-processing the pressed blank to obtain the neodymium-iron-boron magnet. The magnetic field is attenuated through alternating-current oscillation, the magnetic field direction is perpendicular to the static magnetic field direction, agglomeration of the magnetic powder can be scattered, and meanwhile the influence of non-parallel magnetic lines of the magnetic field on magnetic powder orientation can be reduced.

The invention provides a three-phase electromagnetic coupling mechanism and a wireless power transmission system, and relates to the technical field of wireless power transmission. The three-phase electromagnetic coupling mechanism comprises a magnetic core layer, an A-phase coil, a B-phase coil and a C-phase coil, wherein the A-phase coil, the B-phase coil and the C-phase coil are arranged on the magnetic core layer in a stacked mode and form a three-layer stacked structure. The A-phase coil, the B-phase coil and the C-phase coil respectively comprise two coil sections which are electrically connected, each coil section covers a 180-degree corresponding area in the circumferential direction of the magnetic core layer, and orthographic projections of the two coil sections of each phase coil on the magnetic core layer are in central symmetry; and each layer of the three-layer laminated structure is provided with coil parts of coil sections of at least two different-phase coils. Multi-layer participation and symmetrical coverage of the three-phase coils are realized in the three-layer laminated structure, and each layer comprises different-phase coil sections, so that the problems of low space utilization rate and non-uniform magnetic field of a planar structure are effectively solved, and the magnetic coupling stability and the power transmission performance are improved.

A design method for a double-layer, double-plane self-shielded coil significantly reduces magnetic field crosstalk and shielding barrel coupling effects, improving magnetic field stability and space utilization. It is suitable for coil design and integration applications in high-precision magnetic field control systems. A target field model is established based on the target magnetic field distribution, and magnetic flux constraints ensure that the external magnetic field of the coil approaches zero, thus achieving self-shielding characteristics. Subsequently, a stream function discretization method is used to obtain the coil winding path, and a mapping relationship and current scaling factor between the inner and outer coil layers are established to ensure that the double-layer coil effectively cancels out the external magnetic field while generating the target magnetic field. To further optimize magnetic field uniformity and energy distribution, this invention introduces a tornado optimization algorithm for global optimization of the coil distribution, thereby obtaining a coil structure with high uniformity and high attenuation performance. Finally, finite element simulation is performed on the coil shape to analyze whether its uniformity and attenuation meet the design requirements.

The utility model discloses a differential driving type loudspeaker with inner and outer sets of magnetic circuits and a sound box. Wherein the differential driving type loudspeaker with the inner and outer sets of magnetic circuits comprises an inner side upper washer, an inner side upper magnet arranged below the inner side upper washer, an inner side magnetic conductive column arranged below the inner side upper magnet, an inner side lower magnet arranged below the inner side magnetic conductive column, and an inner side lower washer arranged below the inner side lower magnet; the voice coil is sleeved on the outer end surfaces of the inner side upper washer and the inner side lower washer; the magnetic flux ring is sleeved on the outer end surface of the voice coil; the outer side upper washer is sleeved on the outer side of the upper part of the voice coil; the outer side upper magnet is arranged below the outer side upper washer; the outer side lower magnet is arranged below the outer side magnetic conductive column; and the outer side lower washer is arranged below the outer side lower magnet. The magnetic field sensor has the beneficial effects of light weight, low energy consumption, high magnetic field intensity and high sensitivity.

The invention discloses a shot blasting, sorting, cleaning and recycling system. Steel shots, oxide skin and dust are separated through a stirring kettle by means of flowing of a liquid medium. An electromagnetic module attached to the side wall of the kettle body is arranged outside the kettle body, the magnetic field of the electromagnetic module is changed through a current control module, and gradient magnetic attraction is generated to enable steel shots, oxide skin and dust to be mixed with liquid in sequence and discharged; the invention further discloses a shot blasting, sorting, cleaning and recycling method. The method comprises the steps of liquid mixing and stirring (enabling dust, steel shots and oxide skin to be preliminarily dispersed), gradient magnetic attraction (enabling a high-intensity magnetic field to attract the steel shots and enabling a medium-intensity magnetic field to attract the oxide skin) and step-by-step impurity removal (firstly removing non-magnetic dust liquid, then enabling the oxide skin to be separated and discharged by lowering the magnetic field, and finally achieving thorough separation of the steel shots and the impurities). And dust, oxide skin and steel shots in waste materials generated by shot blasting are effectively separated.

The invention discloses a rotor structure for fixing a magnet by using a magnetic pole box, relates to the technical field of motor rotors, and aims to solve the problems of poor fixing reliability, inconvenience in installation and adjustment and high maintenance cost of a permanent magnet in the prior art. The top of the rotor support is provided with a rotor iron core, and the bottom end of the annular inner wall of the rotor iron core is connected with symmetrically-distributed pull rods in an inserted mode. The fixing device is reliable in fixing and high in stability, the problem that a permanent magnet of a traditional structure is not reliable in fixing is solved through a multi-stage positioning and elastic pressing structure, rigid supporting is formed by the pull rod and the fastening assembly, circumferential positioning is achieved through cooperation of the check block and the groove, and axial elastic pressing is formed by the limiting ring and the pressing block; triple fixation enables the permanent magnet not to loosen and fall off at a high rotating speed, the rubber pressing block buffers pressure, the fragmentation rate of the permanent magnet is reduced, the distribution uniformity of a magnetic field is improved, the vibration noise of the motor is reduced, and the operation stability is remarkably improved.

Provided is a vehicle that, in order to promote the safety of a user having an active implantable medical device implanted therein, is configured to acquire a strength of a magnetic field inside the vehicle, notify the user of the strength of the magnetic field, and control at least one electric device among a plurality of electric devices in the vehicle, in order to reduce the strength of the magnetic field. The vehicle may be a combustion engine vehicle and / or an electric vehicle.

This invention relates to the field of motor technology, specifically to a ring-shaped waveform coil winding and a coreless motor. The ring-shaped waveform coil winding includes a wire harness unit, which is wound a plurality of turns along a ring path; the extension trajectory of the wire harness unit alternately bends in a wavy shape towards the inner and outer sides of the ring path; the wire harness unit includes a first segment and a second segment; the first segment and the second segment are alternately connected; the portion of the wire harness unit extending circumferentially along the ring path is the first segment; the portion of the wire harness unit extending radially along the ring path is the second segment; at least a portion of the first segment is stacked along the axial direction of the ring path. This solves the problem of low magnetic field density in the waveform coil winding.

The utility model provides a kind of device for testing the influence of magnetic field on insects, it is related to experimental device technical field, including testing device cabinet, the testing device cabinet inside bottom end is fixedly connected with test box, two sealing baffles are provided in the test box, the testing device cabinet one side is provided with the magnetic field generating device for generating magnetic field, test is carried out by the principle that magnetic field intensity is exponentially reduced with distance, according to the migration condition of insects inside test box, determine the most suitable magnetic field interval, in the detection process, if insects migrate to the lowest magnetic field interval, magnetic field can be further reduced, such as moving to high magnetic field interval, then further improve magnetic field.

This invention relates to the field of thermal management technology, specifically to a magnetic functional thin film and a thermal interface material. The magnetic functional thin film comprises an acrylate polymer matrix and iron oxide-coated carbon fibers dispersed in the acrylate polymer matrix; the iron oxide-coated carbon fibers are oriented along the thickness direction of the magnetic functional thin film. This invention achieves efficient oriented alignment of carbon fibers under low magnetic field strength through a strategy of "magnetic coating + low magnetic field induction + ultrasonic vibration synergy," significantly improving the vertical thermal conductivity of the film while endowing it with excellent flexibility and mechanical strength. It can be widely used in fields such as chip heat dissipation, flexible electronics, and 5G communication equipment.

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

This invention provides a self-starting synchronous reluctance motor rotor, a motor, and a compressor. The self-starting synchronous reluctance motor rotor includes a rotor core and end rings. The rotor core includes a first rotor lamination and a second rotor lamination. The first rotor lamination has a first filling groove, a second filling groove, and a slit groove. The first filling groove and the slit groove are arranged in the same layer. The second filling groove is located on the outermost layer in the q-axis direction of the rotor and is not in the same layer as the slit groove. The second rotor lamination can completely or partially cover the second filling groove on the first rotor lamination. According to this invention, harmonics generated by eddy currents in the second filling groove can be reduced, the harmonic content of the motor can be reduced, the torque ripple rate and vibration noise of the motor can be improved, and the reliability of motor operation can be enhanced. By effectively reducing magnetic field harmonics, torque ripple and vibration noise problems caused by harmonics can be avoided.

Disclosed in the embodiments of the present invention is a low-magnetic-field magnetoresistive angle sensor. The sensor comprises: a substrate located in an X-Y plane, and a magnetoresistive sensing unit located on the substrate. The magnetoresistive sensing unit comprising a multi-layer thin film structure. The multi-layer thin film structure comprises at least a stack of a free layer, a barrier layer, and a reference layer. The magnetoresistive sensing unit has an oval shape. The oval-shaped free layer has a long axis Ly, a short axis Lx, and a thickness Lz. Additionally the free layer has a saturation magnetic field, a shape anisotropy demagnetizing field, and a magnetocrystalline anisotropy field in the X direction. When an external magnetic field rotates by 0-360° in the X-Y plane, the magnetocrystalline anisotropy field is compensated by the shape demagnetizing field to cause the effective anisotropy field of the free layer to be close to 0, such that the external magnetic field has a low working magnetic field value close to that of the saturation magnetic field of the free layer material. The embodiments of the present invention can improve the accuracy of angle measurement of a magnetoresistive angle sensor. Additionally because the required external magnetic field is low, the sensor can be implemented at low cost.

The application relates to a solid-state spin nondestructive detection device which comprises a diamond block, a data acquisition module, a data processing module and a main control module; the diamond block contains an NV color center, two paired magnetic characteristic frequencies of the NV color center are set as two selectable data sampling points, the data acquisition module is used for sampling analog data and is configured to alternately sample the two data sampling points in turn; the data processing module is used for real-time calculation of the average value of the previous N sampling data of the current sampling data, and the average value is subtracted from the current sampling data to obtain a difference value as real-time output magnetic field noise reduction characteristic data. The application has the advantages that the two magnetic characteristic frequencies are alternately sampled, the algorithm of "current sampling data minus average value of previous N sampling data" is combined, temperature suppression and magnetic field measurement noise reduction are realized, the magnetic field sampling rate and the frequency sampling rate are kept consistent, and the magnetic field sampling rate and the detection speed are improved.

This invention discloses a method and system for optimizing the magnetic field of a counterpolar high-temperature superconducting magnet device, relating to the field of induction heating technology. The method includes: acquiring induction heating characteristic numbers of the counterpolar high-temperature superconducting magnet device to be optimized; determining the type of the counterpolar high-temperature superconducting magnet device based on the induction heating characteristic numbers, and determining the core topology and optimization parameter set within the counterpolar high-temperature superconducting magnet device based on the type of the device; and determining the target parameter combination for magnetic field optimization from the optimization parameter set according to preset rules, using the temperature distribution of the counterpolar high-temperature superconducting magnet device after heating as the optimization objective. This invention solves the problems of poor adaptability, low magnetic field control precision, and low efficiency of multi-parameter optimization in existing technologies for optimizing the magnetic field of counterpolar high-temperature superconducting magnet devices.

The application discloses a low-noise high-precision triode current source, which comprises a current source filter noise reduction circuit, an output voltage adjustment and calibration circuit and a voltage source to current source circuit connected in sequence, wherein the output voltage adjustment and calibration circuit comprises a digital-to-analog converter, a PC end, a resistor R3, a resistor R4, a resistor network, a second operational amplifier and a third operational amplifier; the output end of the PC end is connected with the input end of the digital-to-analog converter; the output end of the digital-to-analog converter is connected with the inverting input end of the third operational amplifier; the non-inverting input end of the third operational amplifier is connected with the non-inverting input end of the second operational amplifier through a relay K2; and the output end of the third operational amplifier is connected with the input end of the PC end. The triode current source provided by the application has low low-frequency noise, high output current precision and stable output current, and can effectively reduce the low-frequency noise of a magnetic field when the current source is used to supply power to a magnetic field coil.

The paraffin tissue slicing machine convenient to separate comprises a machine body, a sample clamp, a driving mechanism, a waste chip groove, a mounting table, a knife rest, a U-shaped partition plate and a separating and collecting mechanism, the separating and collecting mechanism comprises magnetorheological fluid, an electromagnetic coil, an electric sliding table, a bearing plate and a grabbing mechanism, and a paraffin tissue block is sliced through a blade on the knife rest during reciprocating lifting; scraps in the slicing process fall into the separation cavity along the obliquely-arranged tool rest, the magnetorheological fluid is arranged in the separation cavity, the electromagnetic coil is arranged at the bottom of the magnetorheological fluid, the gradient magnetic field is generated after the electromagnetic coil is powered on, if metal impurities are contained in the scraps, the scraps can move towards the high-magnetic-field-intensity direction and are captured by the solidified magnetorheological fluid, and therefore the metal impurities are separated from the separation cavity. And the scraps without the metal impurities can flow in the low-magnetic-field-intensity area, separation of the scraps containing the metal impurities or not is achieved, and finally the scraps can be transferred into the metal impurity cavity and the pure paraffin cavity on the two sides through the grabbing mechanism so that different treatment modes can be adopted conveniently.

The present invention provides an EMI shielding device including a flame retarding, thermal interface material composite with a through plane thermal conductivity of no less than 30 W / mK and a dielectric withstanding voltage of no less than 1 kV / mm, where the composite includes at least one dielectric layer of self-aligned, carbon-based materials associated with superparamagnetic particles and at least one layer of fillers including a blend of dielectric heat transfer materials with a thermal or UV curable polymer or phase change polymer. The anisotropic heat transfer carbon-based materials associated with superparamagnetic materials are aligned under a low magnetic field strength of less than 1 Tesla to an orientation that results in a high thermal conductivity direction which can conduct the maximum heat from the adjacent device of the present composite. The present invention also provides a method for preparing the composite.

The invention relates to the technical field, and discloses a multi-coil inductor and a production technology thereof.The method comprises the steps that a magnetic conductivity material is selected to prepare an EE type magnetic core, and an air gap is formed in the center position of a magnetic core center column; the number of turns, the wire diameter and the winding mode of each coil winding are designed, and an insulating layer is arranged between every two adjacent coil windings; dividing the total magnetic flux into a plurality of equivalent magnetic fluxes by adopting a magnetic field division method, and respectively calculating the magnetic fluxes of all parts and the influence of the magnetic fluxes on the magnetic resistance; the wire diameter and the paint thickness of the coil winding are optimized through finite element analysis, and the self-tuning frequency of the inductor is improved; coil winding is carried out by adopting automatic winding equipment, so that uniform and stable winding is realized; and selecting a packaging material, and packaging the inductor by adopting a vacuum packaging technology. The multi-coil inductor has the advantages of being excellent in high-frequency performance, low in parasitic parameter, uniform in magnetic field distribution and high in packaging reliability, and is suitable for various high-frequency application scenes.