2133results 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

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.

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.

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.

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.

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 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.

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.

The invention discloses an iron-nickel metal magnetic powder core with high stable magnetic conductivity and low loss and a preparation method of the iron-nickel metal magnetic powder core. The iron-nickel metal magnetic powder core is prepared through the steps of preparing iron-nickel alloy powder through gas atomization, screening the particle size, carrying out insulation coating, carrying out compression molding, carrying out heat treatment and carrying out impregnation and spraying. Wherein in the insulating coating process, a passivation solution is adopted to form an insulating layer on the surface of the iron-nickel alloy powder, and the passivation solution comprises 0.1 wt%-0.3 wt% of phosphoric acid, 0.1 wt%-0.6 wt% of sol and the balance deionized water according to the weight part of the iron-nickel alloy powder; and the pH value of the passivation solution is 4-7. According to the technical scheme, the iron-nickel alloy powder is subjected to insulation coating through cooperation of the phosphoric acid, the sol and the coating agent, the magnetic hysteresis loss is effectively reduced, the magnetic conductivity of the iron-nickel magnetic powder core is improved, the quality factor of the iron-nickel magnetic powder core is remarkably improved to 95 or above, and after the obtained high-magnetic-conductivity low-loss iron-nickel magnetic powder core is subjected to long-term high-temperature aging, the magnetic conductivity change rate does not exceed 2%; and the safety and the performance stability are greatly improved in the application of power electronic devices.

A first winding is wound around a first middle column of a first magnetic core, and a second winding is wound around a second middle column of a second magnetic core. The third magnetic core is located between the first winding and the second winding, the third magnetic core has a through hole, and both the first middle column and the second middle column extend into the through hole. When a direction of a magnetic field generated by the first winding is the same as a direction of a magnetic field generated the second winding, the first magnetic core and the second magnetic core generate common-mode inductance. When a direction of a magnetic field generated by a third winding is opposite to a direction of a magnetic field generated a fourth winding, the third magnetic core generates differential-mode inductance.

The invention relates to a device (10) for inductive energy transmission into a human body (1), having a transmitter coil (24) and / or a receiver coil (14) having a first magnetic core (26) and a resonance or choke coil (16, 34) having a second magnetic core (32), wherein the first magnetic core (26) forms a part of the second magnetic core (32).

The invention provides a hot-pressing preparation method and application of a magnetic powder core. The hot-pressing preparation method comprises the following steps: carrying out insulation coating on glassy state soft magnetic amorphous alloy powder to obtain an intermediate powder material with a coating structure; the coating structure comprises a first coating layer or comprises a first coating layer and a second coating layer which are arranged in sequence; the first coating layer comprises nano inorganic particles and phosphate, and the second coating layer comprises an organic coating material; carrying out hot pressing treatment on the material containing the intermediate powder material to obtain a magnetic powder core; the adopted glassy soft magnetic amorphous alloy powder has a supercooled liquid phase region, the lowest temperature and the highest temperature of the supercooled liquid phase region are Tg and Tx respectively, the temperature of the hot pressing treatment is (Tg-20 DEG C)-(Tx-20 DEG C), the pressure of the hot pressing treatment is 100-500 MPa, and the holding time is 2 s-120 min. According to the magnetic powder core provided by the invention, the coating layer can be kept complete in the hot pressing process, and the magnetic powder core has relatively high density, high resistivity, high magnetic conductivity and low loss.

The invention provides a liquid immersion type iron core column system adopting DMC air gap cushion blocks and an electric reactor. The air gap cushion block made of the DMC material is arranged between the iron core cakes on the iron core column, the high temperature resistance, high strength, low density and excellent insulating property of the DMC material are utilized, and the air gap cushion block has good compatibility with natural ester insulating oil. By means of the design, the DMC air gap cushion block keeps stable and does not deform in the long-term operation of the reactor, the influence of impulse voltage on the iron core column is effectively absorbed, and therefore vibration and noise of the reactor are remarkably reduced. Besides, the iron core column system comprises a main air gap and auxiliary air gaps which are flexible and adjustable, the main air gap is located in the center of the iron core column, the auxiliary air gaps are distributed at the positions of an upper iron yoke and a lower iron yoke at the two ends of the iron core column, the inductance value can be accurately controlled by adjusting the sizes of the air gaps, and then the overall performance and the production efficiency of the reactor are improved.

The invention provides a special-shaped magnetic core and a manufacturing method thereof.The special-shaped magnetic core comprises a first magnetic core part, a second magnetic core part and a magnetic adhesive layer, the magnetic adhesive layer is bonded between the first magnetic core part and the second magnetic core part, and the magnetic adhesive layer comprises a plurality of magnetic powder particles, a resin adhesive base material and at least one spherical particle; the maximum size of any magnetic powder particle is smaller than the sphere diameter of one sphere particle, and the first bonding face of the first magnetic core part and the second bonding face of the second magnetic core part abut against the two radial opposite ends of one sphere particle respectively to form a bonding combination gap between the first magnetic core part and the second magnetic core part. The sphere diameter of the sphere particles ranges from 1 micrometer to 20 micrometers. The special-shaped magnetic core has the advantages of being small in size, good in consistency, good in magnetic property and low in production cost, so that the product quality is improved, and the requirement for product miniaturization is met.

An improved cooling electromagnetic device comprising a magnetic core (10) with at least one electrically conductive winding (20) and at least one slot (11) dividing the magnetic core (10) into several independent magnetic core portions (10'), and at least one cooling structure (30) comprising a heat sink (32) in thermal connection with at least one thermally conductive element (31) comprising a flat wall made of a non-magnetic metal tightly inserted into one of the slots (11) of the magnetic core (10); wherein the cooling structure (30) further comprises cooling channels connected to a cooling circuit, the cooling channels being defined in the heat sink and / or in the part of the at least one thermally conductive element (31) of the cooling structure (30);and the cooling channels comprising several parallel bores (61) and at least one transverse bore (62) intercepting these several parallel bores (61) and connecting them together.;

The invention provides a high-frequency low-loss manganese zinc ferrite magnetic core and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing base material Fe2O3 powder, MnO powder and ZnO powder, and sequentially carrying out first ball milling treatment, first sintering treatment and spray granulation to obtain granulated powder; and (2) mixing the granulated powder and an additive, and sequentially carrying out second ball milling, compression molding and second sintering treatment to obtain the high-frequency low-loss manganese zinc ferrite magnetic core. The manganese-zinc ferrite magnetic core prepared by the method is relatively low in magnetic loss under the condition of 3-5MHz, and has a wide-range popularization and application prospect.

The nanocrystalline magnetic core magnetic field heat treatment process comprises the following steps that S1, after a nanocrystalline magnetic core is wound, an integrated magnetic pulling process is prepared, or after annealing, a secondary magnetic pulling process is prepared; s2, a transverse magnetic field heat treatment process is set, heat preservation is conducted at a high temperature section firstly, and it is guaranteed that the temperature of a furnace body and the temperature of a magnetic core are uniform; s3, applying a transverse magnetic field when the transverse magnetic field heat treatment starts to cool from the set temperature, stopping cooling and preserving heat for a period of time when the temperature is reduced to a set heat preservation section, and cooling to the tapping temperature after heat preservation is finished; and S4, finally, the magnetic core subjected to transverse magnetic heat treatment is normally transferred to the rear-section assembling, detecting, packaging and shipping procedures. According to the magnetic field heat treatment process disclosed by the invention, compared with the conventional secondary heat preservation magnetic pulling and cooling magnetic pulling, the direct current bias resistance of the magnetic core is remarkably improved on the premise that the magnetic conductivity is not reduced, so that the redundancy of the magnetic core to a working environment is improved.

Provided are a grain-oriented electrical steel sheet and stacked iron core having properties that can achieve both low iron loss and low noise in transformers by suppressing vibration caused by electromagnetic forces at the joint parts of the stacked iron core. The grain-oriented electrical steel sheet comprises, on at least one of both surfaces thereof, a plurality of strain regions that extend linearly in a direction transverse to a rolling direction of the steel sheet and are arranged at intervals in the rolling direction, wherein a standard deviation σBr of residual magnetic flux density Br determined from a hysteresis loop measured by exciting the steel sheet to 1.7 T with the rolling direction as a magnetization direction is 0.38 or less.

The present invention relates to a method for producing a soft magnetic alloy powder, a soft magnetic alloy powder, a powder magnetic core, a magnetic element, and an electronic device. Provided are a soft magnetic alloy powder having a low coercive force, a method for producing the soft magnetic alloy powder capable of stably producing the soft magnetic alloy powder, a powder magnetic core containing the soft magnetic alloy powder, a magnetic element provided with the powder magnetic core, and an electronic device provided with the magnetic element. A method for producing a soft magnetic alloy powder, said soft magnetic alloy powder being produced from FexCuaNbb (Si1-y (B1-zCrz) y) 100-x-a-b [wherein 0.3 < = a < = 2.0, 2.0 < = b < = 4.0, 75.5 < = x < = 79.5, 0.55 < = y < = 0.91, and 0.015 < = z < = 0.185 are satisfied. A step for producing an amorphous alloy powder having an average particle diameter of 10.0 [mu] m or more and 45.0 [mu] m or less; and a step for producing the soft magnetic alloy powder by heating at a temperature of 420 DEG C to 620 DEG C. The crystal grain size measured by X-ray diffraction is 5.0 nm to 20.0 nm, and the volume resistivity of the compact is 9.0 * 10 <-3 > [Omega * cm] or less.

The present invention discloses a magnetic ring with a curved surface and a manufacturing process thereof, which belongs to the field of soft magnetic material production technology, and comprises the following steps: first preparing a preset amount of FeSiCr alloy powder; then, using ball milling to flatten it; then, performing surface phosphating on it; after it is fully dried, passivating it, and then, insulating and coating the material after secondary acidification; and then, after respectively pressing and forming, curing treatment and auxiliary processing, a magnetic ring product with a curved surface can be obtained. The stoichiometric ratio of the core molecular formula of this magnetic ring product is a mass percentage, wherein Fe is 87.80-91.75, Si is 3.65-8.20, and Cr is 4-5.55, and the sum of the percentages of the above three components is 100. The present invention solves the technical problem of large high-frequency loss of magnetic ring products in the prior art.