44results about How to "High Effective Permeability" patented technology

The invention discloses a magnetic core with a linear hysteresis loop. The magnetic core comprises a magnetic core body, wherein the magnetic core body is made of iron-based nanocrystal soft magnetic alloy, and the iron-based nanocrystal soft magnetic alloy comprises the following constituents according to atomic ratios: 72-76 parts of iron, 12-16 parts of silicon, 5.2-7.5 parts of boron, 1.5-3 parts of niobium, 1-1.8 parts of vanadium, 0.8-1.1 parts of copper and 0.2-3 parts of rare metal. The magnetic core is provided with the linear hysteresis loop, the residual magnetic flux density Br is smaller than 0.02T, the coercivity is smaller than 1.5A/m, the saturation flux density is larger than 1.1T, and the linear magnetic conductivity of different magnetic cores which are produced can be controlled between 1,500 and 35,000.

The invention discloses a magnetic field heat treatment method for improving high frequency magnetic property of iron based nanocrystal. The magnetic field heat treatment method for improving the highfrequency magnetic property of the iron based nanocrystal comprises the following steps that a belt material is rolled into a ring shape magnetic core, heat treatment is conducted in two system devices respectively, firstly the magnetic core is placed in a heat treatment tube furnace, crystallization annealing is conducted, and alpha-Fe (Si) nanocrystal phase is separated out; then the magnetic core after crystallization is placed in a high-intensity magnetic field heat treatment furnace, crossed magnetic field heat treatment is conducted, magnetic anisotropy of the magnetic core is generatedin the magnetic field applying direction, and thus magnetic property of the magnetic core in high frequency is improved; a precision magnetic element analyzer is used for measuring the single-turn inductance value of the treated magnetic core, and effective magnetic conductivity is conversed through formulas; then loss of the magnetic core in the high frequency is measured using a soft magnetic alternating current testing device; and finally, the phase structure of a magnetic core sample is analyzed using an X-ray analyzer, and a detecting result is acquired and is compared with an existing magnetic core. The magnetic field heat treatment method for improving the high frequency magnetic property of the iron based nanocrystal further has the advantages that the logic is clear, the operation is simple, and implement is easy to conduct.

Disclosed is a permeable cement stone fracturing exploitation method for non-conventional oil and gas layer such as tight oil and gas, shale gas, coal-bed gas, combustible ice and so on. The method comprises the following complementary processes and embodiments: transporting, storing and pumping process for supercritical carbon dioxide; transporting, storing, preparing and pumping process for fracturing cement slurry; process for mixing the supercritical carbon dioxide and the cement slurry; process of fracturing the supercritical carbon dioxide and the cement slurry on ground; process of forming a permeable cement stone under the ground; and so on. The present invention provides a method for non-conventional oil and gas layer fracturing exploitation without using conventional fracturing proppant and fracturing fluid, having advantages of no flow-back fluid, less water, less material, less equipment, smaller area of well site, lower cost, better stimulation effect, environmental protection, and wide application.

A magnetic core as a magnetic material that acts on an electromagnetic characteristic of the generated magnetic field and a magnetic field shield member that shields the magnetic field generated by magnetic field generation unit are structured such that magnetic particles are arranged in a base material under a dispersed state. As a result, a magnetic core in which an inductance can be set and a magnetic field shield member in which magnetic field leakage can be suppressed effectively, as well as an excitation coil, a transformer, electric equipment and an electrophotographic apparatus using them are easily provided at low costs.

A magnetic sheet according to an embodiment comprises: a first magnetic sheet portion comprising a first surface; a second magnetic sheet portion comprising a second surface that faces the first surface; and an attachment portion arranged between the first surface and the second surface, wherein the attachment portion may comprise a plurality of magnetic particles and a coating layer that is coated with the plurality of magnetic particles and comprises an organic material.

The invention provides a high-effective-magnetic-permeability cobalt-nickel based microcrystalline magnetic material and a preparation method thereof. The material reduces the cobalt content under the condition of guaranteeing better soft magnetic properties. The preparation method is simple in process, low in production cost and suitable for industrial production. The material comprises the following components in percentage by weight: 18-22% of Fe, 30-35% of Ni, 4-7% of Gd, 0.01-0.05% of Ho, 0.1-0.5% of V, 0.01-0.05% of Ru, 6-9% of Al, 1-3% of P1, and the balance of Co.

The present invention provides: (1) a magnetic coil in which magnetic particles 14 form an aggregate and the aggregate of the magnetic particles is disposed in a vessel 12 while the magnetic particles are keeping a particle state, (2) a magnetic field shield member for shielding magnetic field generated from a magnetic field generation member, the magnetic field shield member in which magnetic particles form an aggregate and the aggregate of the magnetic particles is disposed in a vessel 12 while the magnetic particles are keeping a particle state, and an electrophotographic apparatus using them.

An inductor has a coil portion made of a wire wound in a coil shape and an element body in which the coil portion is provided. The element body has a first core member, a second core member, and a third core member. The first core member has a winding core portion configured to be positioned inside the coil portion. The second core member is accommodated in the winding core portion. The third core member covers the coil portion and the first core member in which the second core member is accommodated in the winding core portion.

The invention discloses an inductance type pressure sensor, a manufacturing method and application thereof. The inductance type pressure sensor comprises a plane inductor, a ferrite film, an elastic support pillar and a flexible cover film, wherein the ferrite film is adhered into the flexible cover film, and is positioned between the plane inductor and the flexible cover film; and the elastic support pillar is supported between the plane inductor and the flexible cover film, so that an air gap exists between the ferrite film and the plane inductor. The inductance type pressure sensor has the characteristics of high sensitivity, short response time, high stability and high repeatability.

The invention relates to a multicomponent iron-based amorphous soft magnetic alloy. An expression of the alloy is FeaSibBcPdNieCf, wherein a, b, c, d, e and f are atomic percentage contents of corresponding components respectively and meet the conditions that a is 77-82, b is 3-14, c is 8-14, d is 0-0.3, e is 0-2.2, f is 0-2, and the sum of a, b, c, d, e and f is equal to 100. The multicomponent iron-based amorphous soft magnetic alloy has high saturation magnetic induction density Bs, high effective magnetic permeability [mu]e, high frequency stability, low coercivity Hc and low core loss andis good in moldability, loose in preparation technological conditions and low in production cost.

The invention discloses a hyperelastic micro-nano energy acquisition and sensing integrated microsystem, a manufacturing method and a use method. The microsystem comprises an elastic substrate, a flexible circuit board coil, a deformation body, a conductive permanent magnet and a packaging layer, the elastic substrate is located at the bottom of the deformation body, the packaging layer is located at the top of the deformation body, a first space for placing a flexible circuit board coil is formed between the elastic substrate and the deformation body, and a second space for placing a conductive permanent magnet is formed between the packaging layer and the deformation body; the flexible circuit board coil and the conductive permanent magnet are externally connected with power supply equipment, and/or the flexible circuit board coil is externally connected with excitation alternating current. According to the super-elastic micro-system integrating micro-nano energy acquisition and sensing, the friction part and the electromagnetic part both have good electrical property output; and meanwhile, an active electromagnetic motion sensing function based on an electromagnetic induction law and/or a passive inductive pressure sensing function based on an eddy current effect (an expression form of an electromagnetic induction effect) are/is realized.

The invention discloses a magnetoconductive polyamide hot melt adhesive and a preparation method thereof. The magnetoconductive polyamide hot melt adhesive is prepared from the following raw materials in percentage by mole: 35-45% of dimer fatty acid, 5-20% of dicarboxylic fatty acid, 40-55% of aliphatic diamine, 0.1-2% of an antioxidant, 0.01-0.1% of an acid catalyst and 1.5-15% of a nano magnetic ferrite. The magnetoconductive polyamide hot melt adhesive disclosed by the invention not only has a good magnetoconductive property, but also has good compatibility, and has the characteristics of being high in bonding strength, high in surface hardness, good in heat resistance, high in practicality and the like.

The invention discloses a magnetic powder core based on ferrites soft magnetic material. The magnetic powder core is formed by coating metal powder with strong power adding reducibility in an insulating manner, performing compression molding, and then performing thermal treatment; the ingredients of the magnetic powder core at least comprise the ferrite soft magnetic material, iron, metal with strong reducibility, and oxide of the metal with strong reducibility, and can comprise organic or inorganic insulating adhesive and organic or inorganic dispersion agent. The ferrites soft magnetic powder core prepared through the method provided by the invention can improve the effective magnetic conductivity and the quality factor of the magnetic powder core and improve the resistivity of the magnetic powder core, and can effectively reduce the eddy current loss under high frequency, and the magnetic powder core has good high-frequency characteristic and temperature stability.

A sensing system for determining the location and orientation of an object which comprises a magnetic tag. The sensing system comprises selection coils and interrogation coils. The selection coils are arranged to generate a spatially-varying DC magnetic field from which the location of the tag can be determined in use. At least some of the interrogation coils are arranged to generate one or more AC magnetic fields and at least some of the interrogation coils are arranged to receive harmonics, intermodulation products or time dependent variations of the AC magnetic fields, from which the orientation of the tag is determined in use.

The invention discloses a low-frequency induction type magnetic sensor based on non-volatile detuning. The sensor comprises a sensing unit structure and an adjustable capacitor driven by a piezoelectric beam, and the sensing unit structure comprises a giant magnetostrictive layer, a multi-layer stepped soft magnetic film, an insulating layer, an integrated planar excitation coil, a planar induction coil, an insulating layer, a multi-layer stepped soft magnetic film and a piezoelectric transformer layer which are sequentially arranged on a substrate from bottom to top; the effective magnetic conductivity of the soft magnetic thin film is improved. Meanwhile, the excitation current frequency is reduced, the AC driving capacity of the soft magnetic thin film is enhanced through boosting voltage and synchronous electrostriction stress obtained through the piezoelectric transformer layer, and the power consumption of a device is reduced. Meanwhile, magnetic domain movement is accelerated through magnetic force generated by the giant magnetostrictive material, so that the bottleneck of the maximum magnetic conductivity of the material is broken through, and the sensitivity is further improved. Finally, a new thought and a new method are provided for realizing a passive wireless ultrahigh-resolution and low-power-consumption magnetic sensing system in combination with an electromechanical resonance mechanism of non-volatile detuning.