157results about How to "Good magnetic performance" patented technology

A magnetic recording medium is provided which includes a recording layer formed in a concavo-convex pattern including recording elements formed as convex portions, provides a good flying performance of a magnetic head, and has high reliability. A magnetic recording and reproducing apparatus including that magnetic recording medium and a manufacturing method of that magnetic recording medium are also provided. The magnetic recording medium includes: the recording layer formed in a predetermined concavo-convex pattern over a substrate, the recording elements being formed as convex portions of the concavo-convex pattern; filling elements with which concave portions between the recording elements are filled; a conductive film which has a smaller electric resistivity than the filling elements and is formed over the filling elements; and a protective layer which covers the recording elements and the filling elements and is in contact with an upper surface of the conductive film.

The invention discloses a magnetic fiber and a manufacture method thereof. The magnetic fiber has a sheath core structure in the volume ratio of a sheath to a core bing 3:7-7:3 and is characterized inthat the fiber sheath layer material comprises the following components in percentage by weight: 57-89.7 percent of sheath layer polymer, 10-40 percent of magnetic powder and 0.3-3 percent of bulkingagent; and the fiber core layer material comprises the following components in percentage by weight: 80-97.5 percent of core layer polymer, 2-15 percent of metal power and 0.5-5 percent of coupling agent. The manufacture method of the magnetic fiber adopts the magnetic fiber components in percentage by weight and comprises the following processes: 1. preparing the magnetic fiber sheath layer material; 2. preapring the magnetic fiber core layer material; 3. preparing a sheath core composite magnetic fiber and spinning the sheath layer material and the core layer material obtained in the step 1and the sep 2 according to the volume ratio of the fiber sheath to the fiber core being 3:7-7:3 into a long fiber thread or a short fiber thread; 4. carrying out fiber magnetization processing and magnetizing the long fiber thread or the short fiber thread obtained in the step 3 in the magnetic field strength of 11,000 gausses for 0.05-2 minutes.

A magnetic media for magnetic data recording having a plurality of magnetic grains protected by thin layers of graphitic carbon. The layers of graphitic carbon are formed in a manner similar to onion skins on an onion and can be constructed as single monatomic layers of carbon. The thin layers of graphitic carbon can be formed as layers of graphene or as fullerenes that either cover or partially encapsulate the magnetic gains. The layers of graphitic carbon provide excellent protection against corrosion and wear and greatly reduce magnetic spacing for improved magnetic performance.

The invention discloses a low-cost double-main-phase Ce permanent magnet alloy and its preparation method, and belongs to technical field of rare earth permanent magnet material. The Ce permanent magnet alloy has a chemical formula of (Ce_x,Re_1-x)_aFe_100-a-b-cB_bTM_c in mass percent, wherein 0.4≦x≦0.8, 29≦a≦33, 0.8≦b≦1.5, 0.5≦c≦2, Re is one or more selected from Nd, Pr, Dy, Tb and Ho elements, and TM is one or more selected from Ga, Co, Cu, Nb and Al elements; the Ce permanent magnet alloy has a double-main-phase structure with a low H_A phase in (Ce,Re)—Fe—B and a high H_A phase in Nd—Fe—B. The double-main-phase Ce permanent magnet alloy of the present invention prepared by using a double-main-phase alloy method greatly lowers the production cost of magnet while maintaining excellent magnetic performances.

The invention provides a method for preparing a rare earth permanent magnet through laser additive fast forming and sintering in a hot isostatic pressing mode, and belongs to the technical field of materials. The method comprises the following steps that (1), Nd/Pr/Dy-Fe-B micro powder is prepared; (2), programs are compiled in a control computer of a 3D printing device; (3), a base plate is installed on a work table, laser power is adjusted, and the spot size is controlled; (4), high-pressure nitrogen or argon is utilized for blowing the Nd/Pr/Dy-Fe-B micro powder into a feeding pipeline, and the conveying capacity is adjusted; (5), the Nd/Pr/Dy-Fe-B micro powder is sprayed on the base plate, an electromagnet is used for exerting a magnetic field, and laser is irradiated on the Nd/Pr/Dy-Fe-B micro powder on the base plate; scanning and sintering are sequentially carried out according to the programs to obtain a magnet rough blank; (6), the magnet rough blank is sintered in the hot isostatic pressing mode. A product obtained through the method can be directly used after the surface defects such as uneven surfaces and oxide skin are removed through polishing, and post-processing working procedures of slicing, polishing, wire-electrode cutting and the like are not needed.

The invention relates to an annealing separant for high-magnetic-induction oriented silicon steel, which is composed of the following raw materials in percentage by weight: 1-6% of TiO2, 0.1-2% of Sb2(SO4)3 and the balance of MgO. Water is additionally added, wherein the MgO:water ratio is 1:(8-15). The preparation method comprises the following steps: mixing the MgO and water; adding TiO2, and stirring sufficiently and uniformly; adding the Sb2(SO4)3, and stirring; and continuing stirring for not less than 2 hours for later use. The annealing separant enables the high-magnetic-induction oriented silicon steel to have favorable magnetic induction property and bottom quality, has favorable insulating property, is suitable for the operating requirements of high-capacity transformers, and can lower the concession rate of the product.

The invention discloses a polymer solution-based magnetofluid self-assembly needle-free electro-spinning device which comprises a groove. The device further comprises a controllable magnetic field generation module, a high-voltage electric field generation device, a conductive fiber receiving device used for collecting cellosilk, and at least one conductive and magnetic conductive cone tower. The surface of the cone tower is provided with a threaded groove ascending spirally along the cone tower. The polymer solution-based magnetofluid self-assembly needle-free electro-spinning device is simple in structure, operation is controllable and easy to control, and processing efficiency is high. Meanwhile, the invention further provides a nanofiber electro-spinning method achieved through the needle-free electro-spinning device. According to the method, the aim of controlling jetting of polymer solution-based magnetofluid is achieved by controlling electric and magnetic fields. The method is controllable, easy to control and good in control accuracy.

An R—Fe—B based magnet having gradient electric resistance and a method for producing the same are provided. The magnet includes an exterior layer (G) and a main body layer (H). The exterior layer (G) is connected with the main body layer (H) via a sintered layer (I). The oxygen content in the exterior layer (G) is higher than the oxygen content in the main body layer (H), so the electrical resistivity of the exterior layer (G) is not lower than the electrical resistivity of the main body layer (H). The R—Fe—B based magnet having gradient electric resistance is capable of maintaining high resistance and excellent magnetic performance simultaneously.

A rotor for a reluctance machine and a method of producing a rotor for a reluctance machine is provided. The rotor is formed as a soft magnetic element which is cylindrical in shape. The soft magnetic element has recesses for forming flux barriers, one or more flux barriers being at least partially filled with a filler material, and the filler material of said flux barriers extending up to the rotor periphery and forming part of the rotor periphery.

The invention discloses a high-temperature-resistant electric control hoisting electro permanent magnet which comprises chains connected with hoisting equipment, lifting lugs arranged at the bottom ends of the chains, and an electro permanent magnet body fixedly connected to the bottom ends of the lifting lugs, wherein the electro permanent magnet body is of a sealed integrated structure consisting of a top plate, side plates, an end plate, an inner magnetic plate and a heat insulation plate; an iron core is arranged in the middle in the electro permanent magnet body; main excitation coils sleeve the outside of the iron core; a plurality of groups of magnetic steel are respectively arranged in the middle of the iron core; demagnetization coils respectively sleeve the outside of the multiple groups of magnetic steel; an outer magnetic pole is arranged at the bottom end outside the electro permanent magnet body; the top plate, the side plates, the outer magnetic pole, the inner magnetic plate, the iron core and the multiple groups of magnetic steel form a magnetic loop. According to the high-temperature-resistant electric control hoisting electro permanent magnet, current meeting different demands is generated by using electric control energy; during excitation, the high direct current is supplied; during demagnetization, the intermediate-frequency alternating current is supplied to the demagnetization coils; and therefore, extremely good and convenient control can be realized.

The invention discloses a method for manufacturing an inductive element, comprising the steps of: manufacturing the inductive element by utilizing a die, wherein the die comprises a lower die core and an upper die core; causing the lower die core and the upper die core to relatively move to a filling position and an extrusion position along an axial direction; when the lower die core is located at the filling position, filling an iron silicon alloy material into a first space formed by the lower die core; placing a coil in the iron silicon alloy material in the first space and exposing an extension part of the coil out of the iron silicon alloy material; placing the upper die core at the filling position and filling the iron silicon alloy material into a second space formed by the upper die core to cover the coil body; then moving the upper and lower die cores to the extrusion position to ensure that the iron silicon alloy material is combined with the coil; and solidifying the iron silicon alloy material to ensure that the coil body is fixed in the iron silicon alloy material, wherein high magnetic conductivity is generated by matching the iron silicon alloy material with an integrated structure, the number of turns of the coil is reduced and the cost of the metal material of the coil is low so that the inductive element with low cost, low loss and high magnetic conductivity can be integrated.

A rotor for a reluctance machine is provided. The rotor includes a soft magnetic element which is cylindrical in shape. The soft magnetic element has recesses forming flux barriers. At least part of the recesses are filled with an electrically conducting and magnetically non-conducting filler material such that a starting cage is formed in a peripheral region of the rotor. The ratio of the surface of the filled region of the flux barriers to the surface of the region of the unfilled flux barriers is at least 0.2 for at least one rotor cycle.

The invention discloses a photocureable magnetic-conductive and light-conductive pressure-sensitive adhesive, an adhesive tape and a preparation method of adhesive tape. The pressure-sensitive adhesive comprises the following components in parts by weight: 30-40 parts of modified functional resin, 60-80 parts of aliphatic epoxy modified acrylate resin, 5-15 parts of functional monomer, 10-30 partsof diluent, 0.5-1 part of photoinitiator, 5-10 parts of light-conductive filler, 8-12 parts of magnetic-conductive filler, 1-3 parts of rheological agent, 0.5-1.8 parts of leveling agent, 1-2.5 partsof dispersant, 0.8-2.4 parts of coupling agent, 1-3 parts of a defoaming, 0.2-1 part of a chain transfer agent and 20-50 parts of tackifying resin. The light-conductive and magnetic-conductive adhesive disclosed by the invention has the advantages of excellent light-conducting property and magnetic-conducting property, light crosslinking, easy adhesion, easy stripping and certain temperature resistance, and can be widely applied to adhesion of various products needing light conduction and magnetic conduction.

The invention discloses a sound production device and electronic equipment. The sound production device comprises a shell, a magnetic circuit system and a vibration system, the magnetic circuit systemis arranged on the shell, comprises a side magnet and a side concentrating flux plate arranged at the upper end of the side magnet. A magnetic gap is formed on the inner side of the side magnet, thevibration system comprises a vibrating diaphragm connected with the shell and a voice coil arranged on the vibrating diaphragm, at least part of the voice coil extends into the magnetic gap, a bendingpart is arranged on one side, close to the magnetic gap, of the side concentrating flux plate, and at least part of the bending part is bent towards the direction of the vibrating diaphragm. According to the technical scheme of the invention, the vibration space of the diaphragm is not affected when the thickness of the part, close to the voice coil, of the side concentrating flux plate is increased.

A magnetic component and a power module using the same are provided. The magnetic component includes a magnetic core, a first winding set and a second winding set. The magnetic core includes two connecting portions connected through three magnetic columns to form two opposite sides. Each connecting portion includes a pair of first air gaps spaced apart by the middle magnetic column. The first winding set and the second winding set are made by a flat conductive body, respectively, and spaced apart at a distance. The first winding set includes two first conducting portions connected through a first horizontal portion. The second winding set includes two second conducting portions connected through a second horizontal portion. The first horizontal portion and the second horizontal portion are exposed to the first side, and the two first conducting portions and the two second conducting portions are extended to the second side.

The invention belongs to the technical field of wireless charging, and discloses a high-thermal-conductivity composite magnetism isolating sheet for a wireless charging receiving end and a preparationmethod of the high-thermal-conductivity composite magnetism isolating sheet. The composite magnetism isolating sheet for the high-thermal-conductivity wireless charging receiving end is a composite material formed by alternately compounding nanocrystalline sheets and a composite material layer, and the composite material layer comprises a thermal conductive filler, a magnetic conductive filler and a binder. According to the preparation method, the surface of the magnetic conductive powder is uniformly coated with the heat conductive powder, so that the electrical conductivity of the magneticpowder can be effectively reduced. And meanwhile, even if the composite magnetic powder has a bridging phenomenon in the composite material layer, the heat conductive powder with excellent insulativity on the surface of the magnetic powder can play a certain role in isolation, so that the resistivity of the composite layer is greatly improved, and the improvement of the charging efficiency of thesystem is facilitated.