32 results about "Magnetic stability" patented technology

The invention relates to the technical field of motor monitoring, and particularly discloses an intelligent monitoring system based on a rare earth permanent magnet variable frequency motor. A surface-mounted rare earth permanent magnet synchronous motor adopts a surface-mounted design, the motor is embedded into a magnetic material, a rotor and a stator magnetic field operate synchronously during normal work, and a rotor winding has no induced current; rotor resistance and hysteresis loss do not exist, the efficiency of the motor is improved, and the permanent magnet variable frequency motor not only can reduce resistance loss, but also can effectively improve a power factor; magnetic stability analysis, operation simulation and temperature screening are integrated, a section temperature extreme point is excavated, a time sequence trend of the section temperature extreme point is tracked, a core heat source is accurately positioned, and a heat source area is divided according to a preset threshold value based on a triangular mesh, so that real-time identification and partitioning of the internal heat source of the motor are realized, the internal core heat source is accurately positioned, and overheating of a blind area is avoided; and in combination with the temperature-dependent demagnetization boundary, the magnetic safety margin is calculated in real time, early warning or load limiting is performed in time, and irreversible demagnetization is prevented.

The invention relates to a non-magnetic concrete frame structure with additional aluminum ribs and FRP ribs and non-magnetic concrete. The concrete frame structure comprises FRP beam longitudinal ribs, the additional aluminum ribs, FRP column longitudinal ribs and the non-magnetic concrete. The additional aluminum ribs are anchored at the two ends of the FRP beam longitudinal bars and the top ends of the FRP column longitudinal bars respectively, the anchoring length needed by the FRP bars is effectively reduced, and the FRP beam longitudinal bars and the FRP column longitudinal bars are arranged in the non-magnetic concrete in a non-bending mode. The non-magnetic concrete is prepared from the following components in parts by weight: 360 to 500 parts of non-magnetic cement, 700 to 800 parts of non-magnetic fine aggregate, 950 to 1200 parts of non-magnetic coarse aggregate, 150 to 180 parts of water, 0.2 to 0.4 part of water reducing agent and 0 to 0.2 part of functional additive, and the residual magnetism intensity of each component is lower than 1nT. The FRP bars with the remanence intensity smaller than 0.2 nT and the non-magnetic concrete with the remanence intensity smaller than 1 nT are adopted, and interference of magnetic substances (remanence reaches thousands or even tens of thousands of nT) in conventional steel bars and concrete on high-precision equipment and instruments is effectively avoided. And the service magnetic stability of the structure in the life cycle is effectively guaranteed, and powerful support is provided for development and application of the preceding scientific research technology.

The invention discloses a precision current transformer measurement and data analysis method, particularly relates to the field of current detection and dynamic signal analysis, and comprises a precision magnetic core design scheme based on a nanocrystalline strip and a dynamic magnetic performance test and frequency response analysis method. A nanocrystalline strip with high magnetic conductivity and low loss characteristics is selected as a magnetic core material, and a high-performance magnetic core suitable for multiple frequency ranges is designed; the magnetic stability and response characteristics of the magnetic core material under different working conditions are evaluated by combining high-frequency current source excitation with dynamic magnetic performance test; a signal acquisition and frequency decoding technology is adopted, an output voltage signal is analyzed in real time, and the linearity and precision of a measurement system are optimized through a mathematical model; according to the method, accurate measurement and data analysis of complex current signals under high-precision and high-frequency conditions are realized, and the applicability and reliability of the current transformer are improved.

The invention relates to the technical field of soft magnetic materials, and discloses a soft magnetic composite material, a preparation method thereof and a magnetic element, and the preparation method of the soft magnetic composite material comprises the following steps: dissolving an iron source, a silicon source and a complexing agent in a first solvent to obtain sol; soft magnetic particles are dispersed in the sol, aging and first sintering are sequentially carried out on the sol, the first sintering is carried out in a reducing atmosphere, a coating layer coating at least part of the surface of the soft magnetic particles is generated, and the coating layer comprises Fe2SiO4. The coating layer comprises Fe2SiO4, so that the insulating property and the magnetism of the soft magnetic composite material are balanced, the soft magnetic composite material has high insulating property and magnetism, the structural stability and the magnetic stability of the soft magnetic composite material are improved, and the soft magnetic composite material is suitable for a wider temperature range.

This invention discloses a Cr-rich multiphase hexa-element non-noble metal high-entropy alloy and its preparation method, belonging to the field of magnetic high-entropy alloy technology. Preparation raw materials: Cr 65-70 at.%, Fe 1-5 at.%, Co 1-5 at.%, Ni 1-5 at.%, Al 10-15 at.%, and Mo 10-15 at.%, totaling 100 at.%. Preparation method: (1) Mix the raw materials evenly; (2) Continuously introduce argon gas; (3) Heat at a uniform rate, simultaneously increasing the argon gas flow rate, maintain at 1200℃ for 16 hours, and then reduce the argon gas flow rate; (4) Cool at a uniform rate, simultaneously increasing the argon gas flow rate, maintain at 900℃ for 10 hours, and then reduce the argon gas flow rate; (5) Cool at a uniform rate, maintaining the argon gas flow rate and rapidly cooling to room temperature, thus obtaining the alloy. This invention achieves a high Curie temperature Ti at low cost by combining a precise doping strategy of hexa-element non-noble metal elements with one-step heat treatment and a staged rapid cooling process. c With low saturation magnetization M s The coordinated regulation of these technologies effectively overcomes key bottlenecks such as high magnetic loss and poor magnetic stability in traditional magnetic materials, providing a material basis for the development of next-generation high-frequency and high-temperature magnetic devices.

The invention discloses a Cr-rich multiphase six-element non-noble metal high-entropy alloy and a preparation method thereof, and belongs to the technical field of magnetic high-entropy alloys. The preparation raw materials comprise 65 to 70 at.% of Cr, 1 to 5 at.% of Fe, 1 to 5 at.% of Co, 1 to 5 at.% of Ni, 10 to 15 at.% of Al and 10 to 15 at.% of Mo, and the total amount is 100 at. The preparation method comprises the following steps: (1) uniformly mixing the raw materials; (2) continuously introducing argon; (3) raising the temperature at a constant speed, synchronously increasing the argon flow velocity, keeping the temperature at 1200 DEG C for 16 hours, and reducing the argon flow velocity; (4) cooling at a constant speed, synchronously increasing the argon flow velocity, keeping at 900 DEG C for 10 hours, and reducing the argon flow velocity; and (5) cooling at a constant speed, keeping the argon flow speed, and rapidly cooling to room temperature. According to the preparation method, a precise six-element non-noble metal element doping strategy is combined with a one-step heat treatment and staged rapid cooling process, so that cooperative regulation and control of high Curie temperature Tc and low saturation magnetization Ms are realized at low cost, and the key bottlenecks of high magnetic loss, poor magnetic stability and the like of a traditional magnetic material are effectively broken through; and a material basis is provided for development of new-generation high-frequency and high-temperature magnetic devices.

The utility model discloses a normally open three-way solenoid valve, including a valve seat, a valve cavity is provided in the valve seat, a first channel is provided at the bottom end of the valve cavity, and a second channel and a third channel are provided on the side of the valve cavity; a valve core assembly includes a valve body, a first valve core, a second valve core and an elastic component, the valve body is provided with a flow guide cavity, a first through hole and a second through hole, the outer wall of the first valve core and the inner wall of the flow guide cavity are spaced to form a flow guide interval; the outer wall of the second valve core and the inner wall of the flow guide cavity are sealed and matched; the second valve core is provided with a flow guide channel that is connected to the first channel; a magnet assembly, the magnet assembly includes a fixed iron, a coil group, a moving iron and a connecting rod; the bottom end of the connecting rod is passed through the fixed iron and connected to the first valve core, and the moving iron is used to drive the first valve core to move downward when the coil group is energized; the outside of the moving iron is sheathed with a magnetic isolation tube. The moving iron of the utility model is provided with a magnetic isolation tube on the outside to prevent the moving iron from being exposed and magnetized by the external structure, thereby improving the magnetic stability.

To provide an alternative to rare earth magnetic materials for use in VCM of HDD while considering cost and environmental issues.SOLUTION: In a voice coil motor (VCM), a composite magnet assembly 200 includes: a coil; a first yoke 202a having a coil side facing the coil on a first side; a first low coercivity permanent magnet 204a positioned between the coil and the coil side of the first yoke and having a yoke side facing the first yoke and a coil side facing the yoke side; and a first high coercivity permanent magnet 205a adjacent to the coil side of the first low coercivity permanent magnet. The second side of the opposite side of the coil is similarly constructed. A permeance coefficient of the VCM allows for magnetic stability of a low coercivity magnetic material, and if a relative thickness of a magnet material so dictates by design, an additional high coercivity permanent magnet is bonded to the coil side of each of the first and second yokes and adjacent to the yoke side of the low coercivity permanent magnet.SELECTED DRAWING: Figure 2A

To provide an alternative to rare earth magnetic materials for use in VCMs of HDDs, taking into consideration cost and environmental issues. In a voice coil motor (VCM), a compound magnet assembly 200 includes a first yoke 202a having a coil and a coil side facing the coil on a first side, a first low coercivity permanent magnet 204a positioned between the coil and the coil side of the first yoke and having a yoke side facing the first yoke and a coil side opposite the yoke side, and a first high coercivity permanent magnet 205a adjacent to the coil side of the first low coercivity magnet. A second side opposite the coil is similarly configured. The permeance coefficient of the VCM allows for magnetic stability of the low coercivity magnetic material, and if the relative thickness of the magnet material is so dictated by the design, an additional high coercivity permanent magnet is joined to the coil side of each of the first and second yokes and adjacent to the yoke side of the low coercivity permanent magnet.

The application provides a neodymium-iron-boron magnet with high magnetic stability, a manufacturing method and application thereof. The neodymium-iron-boron magnet has a three-dimensional structure, which comprises a length direction, a pressing direction and an orientation direction; and the orientation deviation angle of the neodymium-iron-boron magnet is less than or equal to 1°. The neodymium-iron-boron magnet and the manufacturing method can effectively improve the magnetic stability of the magnet.

The present invention discloses an alternating-pole series magnetic circuit hybrid permanent magnet memory motor, which includes: a stator, a hybrid permanent magnet rotor, and a non-magnetic conducting shaft. The stator includes a stator yoke, stator core teeth, stator slots, and armature windings; the hybrid permanent magnet rotor includes a rotor core, V-shaped slots, straight-shaped slots, air magnetic barriers, a first permanent magnet, and a second permanent magnet. The first permanent magnet and the second permanent magnet of the present invention form a series magnetic circuit, which helps to improve the operating point of the second permanent magnet, thereby enhancing the magnetic stability effect. Moreover, the second permanent magnet is magnetized bidirectionally along the radial direction, enabling flexible adjustment of the air-gap magnetic density; an alternating-pole design is adopted, using iron core poles to replace half of the permanent magnet poles. While maintaining the torque performance of the motor, by reducing the direct-axis permanent magnet usage, the field weakening current of the motor is effectively reduced; field weakening is carried out using short-time current pulses, with almost no field weakening copper loss, and low coercivity permanent magnets can be field-weakened repeatedly online. The field weakening control is similar to traditional vector control and is easy to implement.

The application discloses a high-magnetic annular magnetic steel and relates to the field of magnetic steels, which comprises an annular magnetic steel body, the upper side, the lower side, the inner side and the outer side of the annular magnetic steel body are provided with high-temperature-resistant layers, the upper side, the lower side and the inner side of the high-temperature-resistant layers are provided with wear-resistant layers, the upper side, the lower side and the outer side of the wear-resistant layers are provided with waterproof layers, the upper side, the lower side and the outer side of the waterproof layers are provided with rust-proof layers, and the upper side, the lower side and the outer side of the rust-proof layers are provided with oxidation-resistant layers. The high-temperature-resistant layers are arranged to protect the annular magnetic steel body from high temperature, keep the magnetic stability, the wear-resistant layers can reduce abrasion and prolong the service life, the waterproof layers can prevent water from entering the annular magnetic steel body and reduce the probability of rusting or oxidizing, the rust-proof layers can prevent rusting caused by contact with air and water, affect the structural strength and the magnetism, and the oxidation-resistant layers can prevent the surface of the annular magnetic steel body from oxidizing and improve the service life.

The invention discloses a method for improving the performance of a bonded neodymium-iron-boron magnet, and relates to the technical field of bonded neodymium-iron-boron magnets, and the method comprises the following operation steps: S1, raw material preparation: selecting a bonded neodymium-iron-boron magnet blank with the density of 6.0-6.5 g / cm < 3 > and the particle size distribution of 20-200 [mu] m; s2, first-time pretreatment, wherein mechanical polishing and plasma activation are included, and after mechanical polishing, the surface roughness Ra of the magnet reaches 0.8-1.2 [mu] m; according to the method for improving the performance of the bonded neodymium-iron-boron magnet, a four-layer composite protection system of an internal infiltration layer, a transition coating, a passive film and an outer anti-corrosion layer is constructed, and precise treatment of all process links is combined, so that synchronous optimization of the density, the anti-corrosion performance, the solvent resistance and the magnetic performance stability of the magnet is achieved; the comprehensive service performance of the magnet is comprehensively improved from structure to function, and the service life of the magnet in a complex environment is effectively prolonged.

This invention relates to a satellite magnetic stability control method for on-orbit operating mode switching, belonging to the field of satellite magnetic stability control; it includes the following steps: Step 1, magnetic design of individual equipment; Step 2, measurement of magnetic moment change of individual equipment using the method of measuring the magnetic moment after demagnetization under zero magnetic field; Step 3, magnetic testing and magnetic compensation calibration of each individual equipment under each satellite operating mode; by reducing the magnetic moment change of individual equipment during satellite operating mode switching, the magnetic stability of the entire satellite is ensured during operating mode switching, so that the magnetic moment change of the entire satellite is minimized, thereby reducing the impact of satellite operating mode switching on in-situ magnetic field measurement tasks; this invention has the advantages of good control effect and high control accuracy for satellite magnetic control.

The application relates to a magnet-free concrete frame structure with additional aluminum ribs and magnet-free concrete, and the concrete frame structure comprises FRP beam longitudinal reinforcement, additional aluminum ribs, FRP column longitudinal reinforcement and magnet-free concrete; the additional aluminum ribs are respectively anchored at the two ends of the FRP beam longitudinal reinforcement and the top end of the FRP column longitudinal reinforcement, the required anchoring length of the FRP longitudinal reinforcement is effectively reduced, and the FRP beam longitudinal reinforcement and the FRP column longitudinal reinforcement are arranged in the magnet-free concrete without bending. The magnet-free concrete is composed of the following components in parts by weight: 360-500 parts of magnet-free cement, 700-800 parts of magnet-free fine aggregate, 950-1200 parts of magnet-free coarse aggregate, 150-180 parts of water, 0.2-0.4 parts of water reducing agent and 0-0.2 parts of functional additive; the residual magnetism intensity of each component is lower than 1 nT. The FRP longitudinal reinforcement with a residual magnetism intensity of less than 0.2 nT and the magnet-free concrete with a residual magnetism intensity of less than 1 nT are adopted, the interference of the magnetic substances (the residual magnetism reaches thousands or even tens of thousands of nT) in the conventional steel bars and concrete on high-precision equipment and instruments is effectively avoided, the magnetic stability during the service life of the structure is effectively ensured, and strong support is provided for the development and application of frontier scientific research technology.

The invention discloses a normal-temperature stable cyclo-N4 structure based on a two-dimensional t-FeN4 single layer and a magnetic regulation and control method, the structure comprises the two-dimensional t-FeN4 single layer and embedded cyclo-N4 units, iron atoms are in a planar four-coordinate configuration and are connected with nitrogen atoms through coordinate bonds, the cyclo-N4 units form a square ring in a D2h point group configuration, and the two-dimensional t-FeN4 single layer is formed by the two-dimensional t-FeN4 single layer and the two-dimensional t-FeN4 single layer and the two-dimensional t-FeN4 single layer and the two-dimensional t-FeN4 single layer. N is equivalent to N triple bond reconstruction is inhibited through cooperation of iron-nitrogen coordination, charge transfer and geometric confinement, and thermodynamic and dynamic stability at normal temperature and pressure is achieved; the magnetic regulation and control method comprises the steps that Fe magnetic moment and magnetic anisotropy energy are regulated and controlled through electron / hole doping, doping is adjusted to change the sign of the magnetic anisotropy energy to achieve easy magnetization direction overturning, high-temperature magnetic stability is verified through combination of a Heisenberg model and Monte Carlo simulation, and structural evolution and magnetic response are simulated and evaluated in a multi-scale mode through a machine learning potential energy model. And a simulation optimization doping process is combined, so that a solution is provided for application of the multi-nitrogen material, and the constructed novel multi-nitrogen material system has high energy density, high stability and function integration.

The invention discloses a heat treatment process processing method for improving the magnetic stability of 1J50 magnetically soft alloy, which adopts an improved vacuum annealing process for the 1J50 magnetically soft alloy: preserving heat at 1150-1160 DEG C for 5-6 hours under the condition that the vacuum degree is less than or equal to 6.67 * 10 <-2 > Pa, cooling to 550-600 DEG C at the speed of 80-100 DEG C / h after the heat preservation is ended, then inflating and quickly cooling at the speed of not less than 400 DEG C / h, and then cooling to 200 DEG C along with a furnace, the method comprises the following steps of: performing air cooling, discharging from a furnace after the temperature is 60 DEG C or below the room temperature, and performing stabilizing treatment, namely performing vacuum aging treatment, preserving heat at 300 DEG C for 5-6 hours under the condition that the vacuum degree is less than or equal to 6.67 * 10 <-2 > Pa, and performing staged aging treatment, performing stepped heating between the lowest temperature of-55 DEG C + / -10 DEG C and the highest temperature of 215 DEG C + / -10 DEG C, raising the temperature at 40 DEG C + / -10 DEG C in each stage, and performing heat preservation for 5-6 hours. And heat preservation is conducted for 2-2.5 h in each stage, and then furnace cooling is conducted. The stability of the magnetic performance of the 1J50 magnetically soft alloy processed by the heat treatment process is improved.

A DC motor magnetic stabilization tool and a magnetic stabilization method thereof. The magnetic stabilization tool is mainly composed of a vehicle-mounted magnetic stabilization fixture, a magnetic stabilization power supply and a fixed work surface that can be connected to electricity. The magnetic stabilization fixture is easy to operate. The screw rod is rotated by a handle, and the sleeve sleeve is sleeved on the motor bracket. The blocking piece penetrates into the slot of the motor shaft core, and the motor can be locked. The control switch is turned on to block the motor. It is designed by itself, simple to process, easy to operate, and does not require complex tool design. The existing blocking tool system is all in the laboratory. This simple design can be incorporated into the production line, and 100% of the motor is blocked to achieve the purpose of magnetic stabilization; the magnetic stabilization method calculates the magnetic stability of the motor magnet and the stability of the working point, and boldly adopts the motor blocking forced demagnetization method. The motor produced by the method has stable performance throughout the life of the motor, the spark does not change suddenly and is always kept at level 1, the output torque is within the error range of ±3%, the working point efficiency remains unchanged, the motor does not demagnetize after the end of its life, and the life 100% meets the design requirements.

The invention discloses a normalizing method for improving the HiB hit rate of low-temperature high-magnetic-induction oriented silicon steel, and belongs to the technical field of high-magnetic-induction oriented silicon steel. By controlling the normalizing annealing and cooling process of the low-temperature high-magnetic-induction oriented silicon steel, particularly controlling the normalizing temperature and cooling rate of the strip steel according to the contents of Si, Al and N in the steel, and reasonably controlling the normalizing time, the number and size of effective inhibitors which are subjected to solid solution and precipitation in the normalizing process of the steel plate are adjusted, the primary grain size is improved, and the inhibiting force is improved; the magnetic performance, especially the magnetic induction intensity, of the finished low-temperature high-magnetic-induction oriented silicon steel is stabilized, and it is guaranteed that the hit rate of HiB of hot rolled plates with different components reaches 100%; meanwhile, the magnetic stability of the strip head and the strip tail of the steel coil in the length direction is improved, and important application prospects are achieved.

The application discloses an inverse-magnetic ultra-thin tellurite glass as well as a preparation method and application thereof, and belongs to the technical field of tellurite glass. The molten glass liquid is drawn out from a slit opening in the middle of a side wall of a smelting furnace by using a melting-annealing method. The middle of the side wall of the smelting furnace is at a position with a distance of 1 / 2 of the height of the furnace body from the bottom. The height of the slit opening is 2.0 mm, the width of the slit opening is 600 mm, and the inclination angle of the slit opening is 45 DEG. The ultra-thin tellurite glass with a thickness of about 5 microns can be obtained by opening the slit opening in the middle of the smelting furnace and drawing the molten glass liquid out by using a drawing device, and the mechanical strength and the inverse-magnetic stability of the tellurite glass can be effectively improved.

To provide an electromagnetic actuator having a moving range with stroke length c and having a stable position at least at one end of the stroke.SOLUTION: An electromagnetic actuator comprises: an armature which has length Hm in a Y-axis direction and a shape symmetrical to a Y-axis; and a fixed stator yoke 1 which supports an electric coil 2. A fixed permanent magnet 4 is placed between an electromagnetic armature and the electric coil, has length Ha in the Y-axis direction, and has an air gap in the Y-axis direction between a fixed yoke and the armature, where (Ha+c) has almost the same size as Hm, and the length of Hm is 0.9×(Ha+c)<Hm<1.1×(Ha+c). The electromagnetic actuator comprises two pole pieces which are integrally provided with the fixed yoke, and provided by extending in the Y-axis direction on both sides of the fixed permanent magnet, with length of Hph and Hpb.SELECTED DRAWING: Figure 2

The invention discloses a lanthanum oxide and barium ferrite composite material, the composite material is prepared by doping lanthanum oxide La2O3 with barium ferrite BaFe12O19 as a matrix, the chemical component of the composite material is Ba (1-x) LaxFe12O19, and x is more than or equal to 0.2 and less than or equal to 0.8. The range of x is any one of 0.2, 0.4, 0.6 and 0.8. The preparation method has the beneficial effects that the magnetic performance stability is improved, the electromagnetic wave absorption performance is enhanced, the impedance matching characteristic is improved, the crystallinity and microstructure of the material are optimized, no impurity phase exists, the process controllability is high, the preparation process is simple and convenient, and the cost is low.

The integrated cooker head glass front panel installation structure comprises a head body, a flue is arranged in the head body, a smoke inlet is formed in the front face of the head body, the head body comprises a head frame and a glass front panel, the head frame comprises a back plate and stand columns arranged on the two sides of the back plate, and containing cavities are formed in the stand columns. The containing cavity is separated from the flue, a magnetic attraction assembly is arranged in the containing cavity, an attraction piece is arranged on the back face of the glass front panel, and the attraction piece is matched with the magnetic attraction assembly, so that attraction fixing between the glass front panel and the machine head frame is achieved. According to the utility model, the structural design is ingenious and reasonable, the practicability is strong, the magnetic component is hidden in the accommodating cavity of the upright post, and the accommodating cavity is separated from the flue in the machine head main body, so that high-temperature flue gas does not affect the magnetic component when flowing through the flue, the magnetic stability is ensured, and the magnetic component is not arranged in the flue, so that the magnetic component is not damaged. And subsequent cleaning and maintenance of the interior of the flue are facilitated, and the safety is improved.

The application relates to a structure design method and device of a permanent magnet rotor, the permanent magnet rotor, computer equipment, a storage medium and a computer program product. The method comprises the following steps: obtaining stress distribution information of an initial structure of a permanent magnet rotor; adjusting the geometric shape of the initial structure of the permanent magnet rotor according to the stress distribution information to obtain a permanent magnet rotor of an adjusted structure; and adjusting the magnetic field distribution of the permanent magnet rotor of the adjusted structure according to the magnetic force information of the permanent magnet rotor of the adjusted structure to obtain a permanent magnet rotor of a target structure; wherein the mechanical load bearing capacity and the operating speed bearing capacity of the permanent magnet rotor of the target structure are higher than those of the initial structure of the permanent magnet rotor. The method can optimize the material mechanical properties and magnetic properties of the permanent magnet rotor, thereby improving the structural strength and magnetic stability of the permanent magnet rotor of the target structure.

A voice coil motor (VCM) includes: a coil; and a first yoke on the first side, the first yoke having a coil side facing the coil; a first low-coercivity permanent magnet located between the coil and a coil side of the first yoke, and having a yoke side facing the first yoke and a coil side opposite to the yoke side; and a first high-coercivity permanent magnet adjacent to the coil side of the first low-coercivity magnet. Second sides of the VCM on opposite sides of the coil are similarly configured. The magnetic conductance of such a VCM enables magnetic stability of low coercivity magnetic materials. Additional high-coercivity permanent magnets may be bonded to the coil side of each of the first and second yokes and adjoin the yoke side of each of the low-coercivity permanent magnets, if the relative thickness of the magnet material is thus determined by design.

The invention provides a magnetic topological insulator heterojunction material and a synthesis method thereof, and relates to the technical field of topological insulator heterojunction materials. The magnetic topological insulator heterojunction material adopts a four-layer composite structure of a magnetic buffer layer, an interface modification layer, a topological insulator layer and a magnetic covering layer, a room-temperature ferromagnetic material Fe3O4 is taken as a magnetic functional layer, (Bi0. 8Sb0. 2) 2Se3 is taken as a topological insulating layer, and lattice matching and defect passivation are realized through an Al2O3 interface modification layer; secondly, the synthesis method is combined with magnetron sputtering, atomic layer deposition and pulse laser deposition technologies, and is matched with a step-by-step annealing process, so that the problems of insufficient magnetic stability, serious interface diffusion and low spin conversion efficiency in the prior art are solved. The Curie temperature of the heterojunction reaches more than 350K, the spin Hall angle is higher than 1.0, and the heterojunction can be used in the fields of diodes and topological quantum computing.

The invention discloses a flaky high-entropy alloy material containing refractory metal and a preparation method of the flaky high-entropy alloy material, the flaky high-entropy alloy material is FeCoNiMnNb alloy, and the molar ratio of Fe to Co to Ni to Mn to Nb in the alloy material is (1-4): (1-3): (1-3): (1-3.5): (0.5-2). The flaky high-entropy alloy material containing the refractory metal is high in flaky degree and saturation magnetization intensity and excellent in high-temperature magnetic stability, and has good application prospects in the fields of electromagnetic shielding and high-temperature magnetic devices.

The present application relates to a structure design method and apparatus for a permanent-magnet rotor, a permanent-magnet rotor, a computer device, a storage medium, and a computer program product. The method comprises: acquiring stress distribution information of a permanent-magnet rotor which has an initial structure; on the basis of the stress distribution information, adjusting the geometry of the permanent-magnet rotor which has the initial structure, so as to obtain a permanent-magnet rotor which has an adjusted structure; and on the basis of magnetic force information of the permanent-magnet rotor which has the adjusted structure, adjusting the magnetic field distribution of the permanent-magnet rotor which has the adjusted structure, so as to obtain a permanent-magnet rotor which has a target structure, wherein the mechanical load bearing capacity and operating speed bearing capacity of the permanent-magnet rotor which has the target structure are higher than the mechanical load bearing capacity and operating speed bearing capacity of the permanent-magnet rotor which has the initial structure. By using the method, the optimization of material mechanical properties and magnetic properties of the permanent-magnet rotor can be realized, thereby improving the structural strength and magnetic stability of the permanent-magnet rotor which has the target structure.

This invention belongs to the field of motor technology and discloses a magnetic pole complementary hybrid permanent magnet memory motor, including a hybrid permanent magnet rotor. The hybrid permanent magnet rotor includes a rotor core, a first permanent magnet, a second permanent magnet, a third permanent magnet, a fourth permanent magnet, and U-shaped magnetic barriers with outward openings evenly distributed around the rotor core. The third and fourth permanent magnets are symmetrically arranged on both sides of the U-shaped magnetic barriers, and the first and second permanent magnets are embedded in a straight line at the bottom of the U-shaped magnetic barriers. The permanent magnets embedded on both sides of each U-shaped magnetic barrier have the same coercivity, but different coercivity from the permanent magnet embedded at the bottom. The permanent magnets embedded at the bottom and sides of adjacent magnetic barriers have different coercivity. Permanent magnets with different coercivity levels in adjacent magnetic poles form a "complementary" arrangement. This invention further expands the rotor design space through a complementary magnetic pole structure, combining high torque density and strong magnetic stability.

This invention discloses a method for improving the magnetic properties of ferrosilicon soft magnetic alloys. The method further includes forging heating of the alloy at a temperature of 850℃±10℃. The alloy is formed by batching and smelting multiple alloying elements in the following weight percentages: C 0.03%, Si 2.5%, Mn 0.05%, P 0.18%, S, Al, with the balance being Fe. The method also includes a heat treatment process: heat treatment at 950℃~980℃ for 4 hours, followed by cooling to 500℃ at a rate of 100℃ / h, and then cooling to below room temperature at a rate of 50℃ / h~150℃ / h before unloading. This invention enables the ferrosilicon alloy magnetic material to possess high saturation magnetic induction (Bs) characteristics while exhibiting low remanence (Br), thereby improving the magnetic stability and reliability of the ferrosilicon alloy magnetic material.