135 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 invention provides a preparation method of a low-interface thermal resistance carbon fiber composite material based on a low magnetic field orientation technology and carbon fiber orientation equipment. The preparation method comprises the following steps: performing surface modification on short carbon fibers by adopting a non-magnetic carbon fiber surface modifier; mixing and dispersing the surface-modified short carbon fiber, liquid silicone rubber and an auxiliary agent to obtain a carbon fiber composite material; calendaring the carbon fiber composite material to a specified thickness, coating the surface of a rotating table with the carbon fiber composite material for rotary orientation, and preliminarily adjusting the distribution of carbon fibers in the carbon fiber composite material; performing orientation arrangement on the carbon fibers in the carbon fiber composite material again by combining a gradient magnetic field lower than 1T with ultrasonic vibration, wherein the vibration direction of the ultrasonic vibration is consistent with the direction of the magnetic field; and carrying out heating curing molding on the oriented carbon fiber composite material to obtain the low-interface thermal resistance carbon fiber composite material. By regulating and controlling fiber arrangement in stages and combining ultrasonic vibration auxiliary dispersion, carbon fiber dominant direction arrangement is effectively achieved, and the magnetic field intensity requirement is lowered.

Winding grooves are formed in a stator iron core in the circumferential direction, the winding grooves comprise outer-layer stator grooves on the yoke portion side and inner-layer stator grooves on the side close to a permanent magnet rotor, harmonic windings are embedded in the outer-layer stator grooves, and the harmonic windings are double-layer short-pitch windings; a fundamental wave winding is embedded in the inner-layer stator slot, and the fundamental wave winding is a centralized winding; a plurality of modulation teeth are arranged in the stator iron core along the circumferential direction in a non-equidistant manner; the number pf of pole pairs of the fundamental wave winding is consistent with the number pf of pole pairs of the permanent magnet rotor, the number ph of pole pairs of the harmonic wave winding is different from the number pf of pole pairs of the fundamental wave winding, and the number Ns of poles of the modulation teeth meets the condition that Ns = pf + ph, Ns = (1 + 2n) ph or Ns = (1 + 3n) ph. The technical defects that a traditional permanent magnet motor cannot utilize harmonic waves and a conventional magnetic gear effect permanent magnet motor cannot efficiently utilize harmonic waves and fundamental waves to do work can be overcome, the torque density of the motor is greatly improved while the power factor is not degraded, and the complexity, the system cost and the additional loss of a magnetic field modulation structure are reduced.

The invention relates to a high-thermal-conductivity all-carbon-series heat-conducting gasket and a preparation method and application thereof, in particular to a high-thermal-conductivity all-carbon-series heat-conducting gasket based on a shearing force field and low magnetic field double-field orientation technology and a preparation method thereof, belongs to the technical field of preparation of electronic functional materials, and is mainly used for thermal management of high-power electronic components such as chips, LEDs and 5G equipment. The high-thermal-conductivity all-carbon-series heat-conducting gasket comprises the following raw materials in parts by weight: 100 parts of organic silica gel, 200-500 parts of pitch-based carbon fibers, 80-230 parts of spherical heat-conducting filler and 300-700 parts of a diluent, and the all-carbon-series heat-conducting gasket is oriented in the direction of a magnetic field by utilizing the synergistic effect of a shear force field and the magnetic field. The process has the characteristics of high production efficiency, low cost and easiness in industrial production, and can ensure that a highly-oriented and tightly-arranged heat-conducting network structure is formed in the composite material. The technical breakthrough is of great significance in promoting the practical application of the high-performance thermal interface material.

The invention discloses an energy recovery type electric tensioner and method for an overhead line, and relates to the technical field of overhead transmission line construction equipment. The tension control mechanism comprises a mounting frame, a first driving mechanism and a fine adjustment mechanism; wherein the mounting rack is connected to the rack in a sliding manner, and the cable is tensioned on the mounting rack; the first driving mechanism is mounted on the rack and is used for driving the mounting rack to slide on the rack so as to control the tension of the cable; the fine adjustment mechanism is installed on the installation frame and used for controlling the tensioning distance between the cable and the installation frame. By arranging the first driving mechanism and the fine adjustment mechanism, the precision of coarse adjustment and fine adjustment is superposed, and a pure mechanical tension control chain is adopted, so that the tension measurement error in a magnetic field is reduced, and the tension control precision is improved; a two-stage control system is formed through the first driving mechanism and the fine adjustment mechanism, and the tension adjusting range is guaranteed.

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.

The invention relates to the technical field of electro-acoustic conversion, particularly provides a panel diaphragm earphone with a magnetic field constraint structure and a manufacturing method, and is used for solving the technical bottlenecks of low magnetic field utilization rate, serious edge attenuation and high eddy current loss of a traditional panel earphone. A magnetic conductive alloy component with a square C-shaped section is arranged on the side, away from a vibrating diaphragm, of a permanent magnet, a substrate part of the magnetic conductive alloy component covers more than 40% of the area of the back side of the magnet, a side wing part wraps the side edge of the magnet according to a gradient rule, and the effective magnetic flux density is improved and the edge magnetic field uniformity deviation is smaller than or equal to 8% by restraining escape magnetic flux and guiding the direction of the vibrating diaphragm; the magnetic conductive alloy is a nickel-iron-molybdenum soft magnetic material and is subjected to cold crucible suspension smelting, nanometer groove etching and pulsed high-intensity magnetic field treatment, the frequency response linearity and long-term reliability are remarkably improved through the scheme, and the magnetic conductive alloy is suitable for high-end audio equipment.

The utility model relates to a motor controller, a driving system and a vehicle, the motor controller comprises a shell, a direct current module, an inversion module, an electric connecting piece and two partition plates, the shell comprises an inner cavity, the two partition plates are fixed in the inner cavity and are spaced from each other, and the direct current module and the inversion module are fixed to the two opposite sides of the two partition plates respectively; the electric connecting piece is electrically connected with the direct current module and the inversion module; and the two partition plates are electromagnetic shielding pieces. The partition plate of the motor controller can separate the magnetic field generated after the direct current module and the inversion module are powered on, electromagnetic interference of the magnetic field on the direct current module and the inversion module is reduced, and normal work of the direct current module and the inversion module is prevented from being affected by an overlarge magnetic field.

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.

The present invention discloses a stripping target head, comprising: a mounting base having a first end, a second end, and a third end, wherein the first end is close to the gyration center of the ion beam, the second end is located at both ends of the gyration direction of the ion beam, an opening is provided on the mounting base, the opening passes through the two second ends and is connected to the first end, the third end is located on both sides of the gyration direction of the ion beam, and the two third ends are provided with a wire groove; a stripping film is coated on the first end and the two second ends and covers the opening; a wire is in contact with the stripping film, the two ends of the wire are located in the wire grooves of the two third ends, and the two ends of the wire are fixed to the mounting base by fasteners; a mounting tube is provided on the mounting base and connected to the grounding wire; a conductive column is provided in the mounting tube and connected to the mounting base. The present invention can improve the installation reliability of the stripping film and reduce the probability of the stripping film being broken during installation. At the same time, it can also reduce the interference of the magnetic field on the current signal drawn from the conductive column, thereby improving the accuracy of the current signal of the stripping film of the acquisition accelerator.

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.