2998results about "Cores/yokes" patented technology

The invention provides an amorphous nanocrystalline magnetic powder core preparation method based on a hot pressing process, which comprises the following steps: passivating metal powder and phosphoric acid, adding the passivated metal powder and phosphoric acid into an organic coating solvent, and uniformly stirring to obtain surface-coated metal soft magnetic powder, the organic coating solvent is organic silicon resin with phenyl groups; carrying out hot press molding on the surface-coated metal soft magnetic powder to obtain a metal soft magnetic composite material magnetic core; the metal soft magnetic composite material magnetic core is subjected to annealing treatment to obtain the metal soft magnetic core with better compactness and magnetic conductivity, specifically, organic silicon resin with phenyl groups is adopted as a coating solvent, and the problem of coating failure can be effectively avoided when an amorphous nanocrystalline magnetic powder core is subjected to hot pressing; the low-pressure forming process is adopted, the situation that the service life of the mold is affected due to too large pressure is avoided, meanwhile, due to the adoption of the low-pressure forming process, an insulating layer on the surface of the magnetic powder cannot be damaged, and magnetic loss of the magnetic powder core is prevented from rising.

To provide: a magnetic particle-containing composition that can form a magnetic particle-containing film having excellent magnetic permeability and is excellent in sedimentation stability; a magnetic particle-containing film that is formed of the magnetic particle-containing composition; and an electronic component that includes the magnetic particle-containing film.SOLUTION: A magnetic particle-containing composition contains: magnetic particles having a plurality of peak tops in a particle size distribution curve showing a volume-based frequency distribution; a resin; and a solvent. If Dmin represents a particle diameter at a peak top Pmin where a particle diameter is minimized and Dmax represents a particle diameter at a peak top Pmax where a particle diameter is maximized among the plurality of peak tops in the particle size distribution curve showing a volume-based frequency distribution, then the ratio of Dmax to Dmin is more than 2.SELECTED DRAWING: Figure 1

To provide: a magnetic particle-containing composition that can form a magnetic particle-containing film having excellent magnetic permeability and is excellent in sedimentation stability; a magnetic particle-containing film that is formed of the magnetic particle-containing composition; and an electronic component that includes the magnetic particle-containing film.SOLUTION: A magnetic particle-containing composition contains: magnetic particles having a plurality of peak tops in a particle size distribution curve showing a volume-based frequency distribution; a resin; and a solvent. If Dmin represents a particle diameter at a peak top Pmin where a particle diameter is minimized and Dmax represents a particle diameter at a peak top Pmax where a particle diameter is maximized among the plurality of peak tops in the particle size distribution curve showing a volume-based frequency distribution, then the ratio of Dmax to Dmin is more than 2.SELECTED DRAWING: Figure 1

To provide: a magnetic particle-containing composition that can form a magnetic particle-containing film having excellent magnetic permeability and is excellent in sedimentation stability; a magnetic particle-containing film that is formed of the magnetic particle-containing composition; and an electronic component that includes the magnetic particle-containing film.SOLUTION: A magnetic particle-containing composition contains: magnetic particles having a plurality of peak tops in a particle size distribution curve showing a volume-based frequency distribution; a resin; and a solvent. If Dmin represents a particle diameter at a peak top Pmin where a particle diameter is minimized and Dmax represents a particle diameter at a peak top Pmax where a particle diameter is maximized among the plurality of peak tops in the particle size distribution curve showing a volume-based frequency distribution, then the ratio of Dmax to Dmin is more than 2.SELECTED DRAWING: Figure 1

To provide: a magnetic particle-containing composition that can form a magnetic particle-containing film having excellent magnetic permeability and is excellent in sedimentation stability; a magnetic particle-containing film that is formed of the magnetic particle-containing composition; and an electronic component that includes the magnetic particle-containing film.SOLUTION: A magnetic particle-containing composition contains: magnetic particles having a plurality of peak tops in a particle size distribution curve showing a volume-based frequency distribution; a resin; and a solvent. If Dmin represents a particle diameter at a peak top Pmin where a particle diameter is minimized and Dmax represents a particle diameter at a peak top Pmax where a particle diameter is maximized among the plurality of peak tops in the particle size distribution curve showing a volume-based frequency distribution, then the ratio of Dmax to Dmin is more than 2.SELECTED DRAWING: Figure 1

To provide: a magnetic particle-containing composition that can form a magnetic particle-containing film having excellent magnetic permeability and is excellent in sedimentation stability; a magnetic particle-containing film that is formed of the magnetic particle-containing composition; and an electronic component that includes the magnetic particle-containing film.SOLUTION: A magnetic particle-containing composition contains: magnetic particles having a plurality of peak tops in a particle size distribution curve showing a volume-based frequency distribution; a resin; and a solvent. If Dmin represents a particle diameter at a peak top Pmin where a particle diameter is minimized and Dmax represents a particle diameter at a peak top Pmax where a particle diameter is maximized among the plurality of peak tops in the particle size distribution curve showing a volume-based frequency distribution, then the ratio of Dmax to Dmin is more than 2.SELECTED DRAWING: Figure 1

Disclosed embodiments may include High Conversion Ratio Hybrid Switched Capacitor Power Converter, including components for, systems including, and methods for the same. Disclosed embodiments may provide a power conversion circuit and architecture that can achieve high efficiency and high voltage conversion ratio by mixing the operation of a switched capacitor charge distributor and a multiphase DC-DC voltage regulator. The circuits may include a magnetic structure and package that can achieve high performance when providing a high voltage conversion ratio while also offering low output current ripple and a fast dynamic response. The converter can be used, for example, to supply electricity to low voltage high current microprocessors in data centers.

A coil component includes a core including a winding core portion, a first flange portion, and a second flange portion, and a first wire and a second wire that are wound around the winding core portion in the same direction and that form a winding portion. The winding portion includes a second intersecting portion along a third side surface of the winding core portion at a position on the winding portion nearest to the second flange portion.

A coil device includes a wire, a core, and a terminal fitting. The wire includes a winding portion and a lead-out portion drawn out from the winding portion. The core includes a shaft and a flange at one end of the shaft. The shaft has the winding portion wound around. The terminal fitting includes a mounting portion connectable to a mounting substrate, a wire connecting portion connected to the lead-out portion, and an intermediate portion connecting the mounting portion and the wire connecting portion. The mounting portion and the wire connecting portion are disposed over a mounting surface of the flange. The intermediate portion has a route extending over an end surface of the flange and a side surface of the flange to connect the mounting portion and the wire connecting portion.

Provided is a powder magnetic core that can reduce carbon dioxide emissions generated during the manufacture of the powder magnetic core. [Solution] A powder magnetic core comprising recycled powder having an insulating film on the surface of soft magnetic particles, the recycled powder being soft magnetic powder obtained by pulverizing used powder magnetic cores.

A laminated core comprising a plurality of segments is provided. The segments each comprise a plurality of soft magnetic lamination sheets that are stacked one on top of another in a direction of stacking and attached to one another by means of a first connection type to form a segment. The segments are attached by means of a second connection type to form a laminated core, the first and second connection types being different.

A saturable-core inductor includes a magnetic core structure having a non-saturable part and a saturable part. The non-saturable core part includes at least one core body arranged to form a closed magnetic circuit with at least one air gap. The saturable core part includes a core bridge element inserted into each of the at least one air gap to form a magnetic bridge across the air gap for the closed magnetic circuit. Each bridge element and the core bodies are configured to be unsaturated at predetermined low current levels to provide a low-current high inductance. Each bridge element is configured to saturate fully first with increasing current levels and to quickly drop the inductance from the low-current high inductance to a low inductance, while the air gap is configured to prevent the core bodies from a full saturation.

The invention relates to an armature system for a solenoid valve including a magnetic core, a magnetic armature, and a tubular armature guide for guiding the magnetic armature, wherein the armature guide is made of plastic, and the magnetic core is connected to the armature guide via a positive connection which is formed by a thermoplastic deformation of the armature guide. Furthermore, the invention provides a valve system, a solenoid valve, and a method for producing the valve system with such an armature system.

Provided is a laminated iron core including: a laminate of electromagnetic steel sheets and a granular oxide that contains magnetite and covers a side surface of the laminate, in which a contact angle of a water droplet until 20 minutes elapses after dropping the water droplet on the side surface covered with the granular oxide is 80° or more. When heights of peaks detected in ranges of 2θ of 41° to 42° and 38° to 39° in XRD measurement of the side surface covered with the granular oxide are represented by H1 and H2, respectively, H1 / (H1+H2) is 0.8 or more.

The invention belongs to the field of soft magnetic functional materials, and particularly relates to a low-loss high-superposition Fe-Si-Al magnetic powder core and a preparation method thereof, and the preparation method comprises the following steps: preparing a coating agent, passivating coated powder, bonding and lubricating, and pressing and annealing. According to the method, based on the hydrolysis characteristic of metasilicic acid and the hydrolysis promotion effect of the alkaline catalyst, nano-porous silicon dioxide is prepared as a coating agent, meanwhile, the etching effect of alkaline matter on silicon dioxide can effectively increase the specific surface area of the nano-porous silicon dioxide, and the bonding strength of the nano-porous silicon dioxide and iron-silicon-aluminum powder is improved; the vacuum calcination treatment not only removes residual reagents, but also promotes sufficient thermal decomposition of metasilicic acid into silicon dioxide for in-situ coating, and stabilizes the lattice structure of the metasilicic acid. The coating layer of the low-loss high-superposition Fe-Si-Al magnetic powder core is firm in combination, thin and uniform in thickness and stable and compact in structure, the hysteresis loss of the Fe-Si-Al magnetic powder core can be effectively reduced, the direct-current bias performance is improved, and rising of eddy-current loss is avoided.

The invention relates to the technical field of iron core production, in particular to a riveting-point-free iron core and a lossless separation process thereof.The riveting-point-free iron core and the lossless separation process thereof.The riveting-point-free iron core comprises the following steps that the position of a silicon steel sheet is pre-determined on a steel belt with a self-adhesive coating; stamping the outer sides of the silicon steel sheets to form the silicon steel sheets and two frames; performing semi-shearing stamping on the joints between the silicon steel sheets and the frame to enable the silicon steel sheets to be punched out of the frame by a certain distance; shaping to enable the silicon steel sheet and the frame to be in the same plane; then the steel belt is cut off, so that the silicon steel sheets and the frame form independent sheet bodies; then the multiple sheet bodies are stacked together, self-buckling points are punched on the frame, and the sheet bodies are stacked and riveted into a whole through the buckling points; the plurality of silicon steel sheets are fixed together by melting and then cooling the self-adhesive coating; fixing the silicon steel sheet, and separating the frame from the silicon steel sheet through a separation tool to obtain an iron core unit; the multiple iron core units are arranged in the circumferential direction, and the adjacent iron core units are connected in a clamped mode to form a complete iron core.

A magnetic core powder including granular powder A of Fe-based, magnetic, crystalline metal material and granular powder B of Fe-based, magnetic, amorphous metal material; the particle size d50A of granular powder A at a cumulative frequency of 50 volume % being 0.5 μm or more and 7.0 μm or less, and the particle size d50B of granular powder B at a cumulative frequency of 50 volume % being more than 15.0 μm, in a cumulative distribution curve showing the relation between particle size and cumulative frequency from the smaller particle size side, determined by a laser diffraction method; the magnetic core powder meeting (d90M−d10M) / d50M of 1.6 or more and 6.0 or less, d10M being a particle size at a cumulative frequency of 10 volume %, d50M being a particle size at a cumulative frequency of 50 volume %, and d90M being a particle size at a cumulative frequency of 90 volume %.

A coil apparatus includes a coil unit including a coil, a base core that is a first core component, and a core module that is a second core component. The first core component includes a center leg that is a leg around which the coil is wound. The second core component includes a plurality of core segments arranged in a row with gaps between them. The second core component is connected to the leg to form a magnetic path together with the first core component.

The invention discloses a preparation method of an iron-silicon-based composite soft magnetic powder core, which comprises the following steps: compounding and uniformly mixing iron-silicon-titanium powder and iron-silicon powder, and carrying out heat treatment in an air atmosphere; and then performing insulation coating on the surface of the magnetic powder by using a polyvinyl alcohol aqueous solution and a nano oxide, and performing compression molding and heat treatment to prepare the iron-silicon-based composite soft magnetic powder core. Compared with a conventional iron-silicon powder core, the iron-silicon-based composite soft magnetic powder core prepared through the method has the advantages that the direct-current bias performance under the condition of 100 Oe is higher than 76%, the volume loss Pcv under the conditions of 50 kHz and 100 mT is lower than 500 mW / cm < 3 >, and the loss performance is obviously improved.

A quasi-planar transformer can include a first winding comprising one or more turns of wire, a second winding comprising one or more turns of a conductive trace disposed on a printed circuit board, and a magnetic core positioned with respect to the first and second windings so as to provide a magnetic flux path coupling the first and second windings. The first winding can be a primary winding having a first half wound in a clockwise direction on a first side of the printed circuit board and a second half wound in a counterclockwise direction on a second side of the printed circuit board, wherein the first and second halves are formed of a single continuous wire. The single continuous wire can pass through an opening in the printed circuit board. The first and second halves of the primary winding can be secured to the printed circuit board.

An electronic device in a wireless power system may be operable with a removable accessory such as a case. The device may convey wireless power to, from, or through the case while the device is coupled to the case. The device may have coplanar power transmitting and power receiving coils. The removable accessory may have an embedded switchable ferrimagnetic core and a coil that overlaps the switchable ferrimagnetic core. The switchable ferrimagnetic core may be operable in a first state where the switchable ferrimagnetic core is unsaturated. The switchable ferrimagnetic core may be operable in a second state where the switchable ferrimagnetic core is saturated by a magnetic field from a permanent magnet in a wireless power transmitting device. In the second state, the switchable ferrimagnetic core may have a lower magnetic permeability and higher magnetic reluctance than in the first state.

An inductor includes a first wire and a second wire, a first magnetic layer containing magnetic particles having an approximately spherical shape, a second magnetic layer containing magnetic particles having an approximately flat shape, and a third magnetic layer containing magnetic particles having an approximately flat shape. The relative permeability of each of the second magnetic layer and the third magnetic layer is higher than the relative permeability of the first magnetic layer. A fourth surface of the first magnetic layer has a second concave portion. A sixth surface of the third magnetic layer has a fourth concave portion.

There is provided a sheet-shaped magnetic member that easily suppresses deterioration of magnetic shielding characteristics for a circling coil. The sheet-shaped magnetic member of the present disclosure includes a plurality of magnetic sheet pieces each formed in an elongated shape and having anisotropy in which magnetic characteristics in a longitudinal direction and magnetic characteristics in a width direction intersecting with the longitudinal direction are different, in which the plurality of magnetic sheet pieces are radially arranged.

The invention belongs to the field of magnetic materials, and particularly discloses an iron-based magnetic core with constant magnetic conductivity and a preparation method and application thereof. According to the method, the iron-based amorphous magnetic core is sequentially subjected to force field heat treatment and magnetic field heat treatment at the specific temperature, the iron-based magnetic core with the constant magnetic conductivity can be obtained, and the iron-based magnetic core has the characteristic that the magnetic conductivity is within the range of 15000-35000 at the frequency of 1-100 kHz and is constant.

The invention discloses a transformer magnetic integration structure integrating double direct current inductors and leakage inductors and an integration method of the transformer magnetic integration structure. In order to solve the related problems that in an existing magnetic integration method, a magnetic core structure is complex in design and large in leakage magnetic flux, and an integration method lacks universality and the like, a single standard EE magnetic core is used for a common type converter with three magnetic element structures including a direct-current inductor, a leakage inductor and a transformer, the winding connection mode and the air gap parameters are reasonably designed, and the magnetic core structure is optimized. Compared with a discrete magnetic part, the number of magnetic elements of the converter can be reduced, the volume proportion of the magnetic part in the converter can be reduced, the volume of a converter system is further reduced, the power density is improved, the magnetic core design is simplified, and the manufacturing complexity of a magnetic integrated structure is reduced; unbalanced current of column windings on the two sides is suppressed, efficient and high-power-density operation of the system is achieved, and stability and reliability of operation of the system are improved.

The invention provides composite magnetically soft alloy powder and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing iron alloy powder, a doped metal source and a first solvent, carrying out one-step drying treatment to obtain a mixed dry material, and carrying out heat treatment on the mixed dry material to obtain a composite material; (2) mixing the composite material, a passivating agent and a second solvent, and performing two-step drying treatment to obtain composite magnetically soft alloy powder; wherein the doped metal source comprises colloidal metal and / or a metal simple substance, and the melting point of the metal simple substance is less than or equal to 800 DEG C.

The invention belongs to the technical field of soft magnetic materials, and particularly relates to an integrally injection-molded nanocrystalline strip winding iron core and a preparation method thereof. The preparation method comprises the following steps: performing annealing crystallization and destressing treatment on an amorphous nanocrystalline strip, winding the amorphous nanocrystalline strip into a closed magnetic circuit, then immersing the closed magnetic circuit into an adhesive resin glue solution, taking out the closed magnetic circuit, and heating, curing and forming the closed magnetic circuit to obtain a magnetic core; the obtained magnetic core is placed in a hard shell, then a copper bar is inserted, finally, a plastic part between the magnetic core and the copper bar is completed through injection molding, and the nanocrystalline strip winding iron core integrally formed through injection molding is obtained. According to the method, integrated injection molding of the magnetic core, the copper bar and the plastic part can be achieved. By further optimizing an adhesive resin glue solution system formed by curing, the curing effect and the magnetic performance of the iron core can be remarkably improved.

An accessory for improving wireless power transfer efficiency in a wireless power transfer system can include a magnetic (e.g., ferrite) core dimensioned and positioned so as to reduce flux coupling from the PTx winding into friendly metal of the PRx and / or to enhance flux coupling from the PTx winding to the PRx winding. The core may define an aperture corresponding to an outer dimension (e.g., outer diameter) of the PRx winding. The core may further have an outer dimension selected to intercept sufficient flux to reduce flux coupling into the friendly metal of the PRx, such as an outer dimension corresponding to an outer dimension (e.g., outer diameter) of the PTx winding. The accessory may be a case for the PRx device or may be configured to be affixed to the face of the PTx device and may also include one or more alignment fixtures.

The invention belongs to the field of power electronic device optimization design, and particularly discloses a magnetic coupling energy storage element under a high duty ratio and an obtaining method. The method comprises the following steps: establishing an output current ripple model; representing the cross sectional area of the magnetic core based on the peak value of the output current ripple, and further constructing a magnetic core volume model and a winding volume model; taking the total volume of the magnetic coupling energy storage element as a target function, solving an optimal coupling coefficient under different duty ratios, matching a magnetic core material and an air gap length according to the optimal coupling coefficient, selecting a magnetic core cross section area according to the maximum flux density of the magnetic core material, and obtaining structural parameters of the magnetic coupling energy storage element; according to the invention, the size of the magnetic coupling energy storage element is reduced to the maximum extent, and the power density of the converter is increased.

Power converters with integrated transformers and resonant inductors are described. An example integrated transformer can be electrically coupled between a primary-side converter stage and a secondary-side converter stage in a power converter. The integrated transformer can include a magnetic core with plurality of core legs, a primary winding extending around each of the plurality of core legs, and a secondary winding extending around each of the plurality of core legs. A winding direction of the primary winding is alternated between adjacent core legs among the plurality of core legs, and a winding direction of the secondary winding is alternated between adjacent core legs among the plurality of core legs. Additionally, a number of winding turns of the primary winding and a number of winding turns of the secondary winding on a first core leg is different than on a second core leg among the plurality of core legs.