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

The invention discloses a wire wound inductor. The inductor comprises an I-shaped magnetic core, outer electrodes respectively formed on the bottom surfaces at the two ends of the I-shaped magnetic core and an enamelled coil wound on a central column of the I-shaped magnetic core, wherein the two ends of the enamelled coil are respectively connected with the outer electrodes electrically. The inductor is characterized by also comprising a cover plate; the cover plate and the I-shaped magnetic core are made of the same materials; and the cover plate is fixed at the top of the I-shaped magnetic core. The invention also discloses a manufacturing method of the wire wound inductor. The method comprises the following steps: 1) forming the outer electrodes: forming the outer electrodes at the two ends of the I-shaped magnetic core respectively; 2) forming the enamelled coil: winding the enamelled coil on the central column of the I-shaped magnetic core and ensuring the two ends of the enamelled coil to be respectively connected with the outer electrodes; and 3) fixing the cover plate: fixing the cover plate made of the same materials as the I-shaped magnetic core at the top of the I-shaped magnetic core. The inductor has the advantages of the closed magnetic circuit inductors and simultaneously has the advantages of simple process, low cost, capability of realizing automatic production and the like.

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.

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 method for making a mold-pressed inductor. The method includes the following steps of S1, magnetic-powder slurry making, wherein magnetic powder, adhesives and solvents are mixed in the preset proportion, and magnetic-powder slurry is formed; S2, pressing, wherein the magnetic-powder slurry obtained in the step S1 is injected into a mold, the magnetic-powder slurry, a coil and a magnetic core are jointly pressed to allow at least a part of the solvents and at least a part of the adhesives in the magnetic-powder slurry to overflow out of the mold, the coil and the magnetic core are preplaced into the mold, and a mold-pressed blank in a preset shape is formed; S3, heating solidifying, wherein the mold-pressed blank obtained in the S2 is heated and solidified, and a molded blank is obtained; S4, terminal electrode making, wherein the molded blank obtained in the step S3 is subjected to appearance shaping so that an electrode can be led and exposed out of the molded blank, a terminal electrode is prepared, and the mold-pressed inductor is obtained.

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.