84results about How to "Low magnetic permeability" patented technology

The related processing method for quench-hardening layer of roller body comprises: processing roller with steel, letting roller body cross in turn the first and second LF sensors and MF sensor for induction electric heating, and spraying water for cool to obtain the target layer with depth more than 50mm. This invention can improve wear and yield, reduces energy consumption, and brings great economic benefits.

A coil component has a first coil part and a second coil part, a middle member, and a shield member. Each of the first and second coil parts includes a drum core and a winding. The middle member is located between the first and second coil parts arranged in a state in which axes of winding drums in the respective first and second coil parts are parallel to each other. The shield member is formed at least in part of an outside surface of the winding in each of the first and second coil parts and is a resin containing a magnetic material powder. The magnetic permeability of the middle member is lower than that of the core and the shield member.

A multilayer coil component includes a coil formed by stacking first ceramic sheets in which coil conductor patterns are provided and a second ceramic sheet having a lower magnetic permeability than the first ceramic sheets, the coil conductor patterns being connected to each other. The second ceramic sheet is disposed between the first ceramic sheets. In a main surface of the second ceramic sheet, holes or recesses are provided. The first ceramic sheets adjacent to the second ceramic sheet are in contact with inner peripheral surfaces of the holes.

This multilayer coil part has a magnetic body section (2) that is made of an Ni-Zn system ferrite material and a Cu-based coil conductor (3) that has been wound into a coil shape. The coil conductor (3) is buried inside the magnetic body section (2) to form a part element body (1). The part element body (1) is divided into a first region (6) that is located close to the coil conductor (3) and a second region (7) that comprises the region other than the first region (6). The grain size ratio (D1/D2) between the average crystal grain size (D1) of the magnetic body section (2) in the first region (6) and the average crystal grain size (D2) of the magnetic body section (2) in the second region (7) is equal to or lower than 0.85. The molar quantity of CuO content in the ferrite material is set to 6 mol% or less, and the ferrite material is baked in a reductive atmosphere with the oxygen partial pressure being equal to or lower than the Cu-Cu2O equilibrium oxygen partial pressure. Thus, a multilayer coil part that exhibits not only little fluctuation of inductance and excellent thermal shock resistance when subjected to a thermal shock or an external stress but also excellent direct-current superposition characteristics can be obtained without requiring any complicated step.

The invention includes a FeNiCo magnetically soft alloy and a production method thereof, wherein the FeNiCo magnetically soft alloy has high magnetic induction intensity, high magnetic permeability, low coercive force, high stability and good corrosion resistance in a low magnetic field. The FeNiCo magnetically soft alloy comprises the following components by mass percent: not more than 0.02 percent of C, 0.2-0.80 percent of Si, not more than 0.50 percent of Mn, 29.00-35.00 percent of Ni, 25.00-32.00 percent of Co, not more than 5.00 percent of Mo, not more than 0.50 percent of Cu, 0.01-0.55 percent of microelements including 0.001-0.05 percent of rare earth elements, and the balance of Fe and inevitable impurities. The FeNiCo magnetically soft alloy is processed and manufactured by adopting the methods of vacuum melting, forging, hot rolling and cold rolling, and after heat treatment, the FeNiCo magnetically soft alloy has the characteristics of high magnetic induction intensity, high magnetic permeability, low coercive force, high stability and good corrosion resistance in a low magnetic field, and can be manufactured into the transducer, the filter, the electromagnetic valve, the transformer and the like in the field of aviation, aerospace, navigation, electron, electric power and the like.

There is disclosed a method for producing a Fe—Co based target material for forming a soft magnetic thin-film. This method comprises the steps of: preparing a first raw-material powder having an Fe:Co weight ratio ranging from 8:2 to 7:3 and a second raw-material powder having an Fe—Co weight ratio ranging from 2:8 to 0:10; mixing the first raw-material powder and the second raw-material powder together to obtain a powder mixture having an Fe:Co weight ratio ranging from 8:2 to 2:8; and applying a pressure of not less than 100 MPa to the powder mixture at a temperature ranging from 1073 to 1473 K for consolidation. At least one additional element selected from the group consisting of Nb, Zr, Ta and Hf is added to either one or both of the first and second raw-material powders in a total amount of 3 to 15 atom % with respect to the total amount of the powder mixture. The Fe—Co based target material thus produced has a high density, while having a magnetic permeability lower than the conventional one.

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 provides an Fe—Ni—Mo soft magnetic flaky powder having a component composition of, in percent by mass, Ni: 60 to 90%, Mo: 0.05 to 1.95%, and the balance of Fe and unavoidable impurities, and a flat surface of an average particle size of 30 to 150 μm, and an aspect ratio (average particle size /average thickess) of 5 to 500; and having a peak intensity ratio I₂₀₀/I₁₁₁ within a range between 0.43 and 10, where I₂₀₀ is the peak height of the face index (200) and I₁₁₁ is the peak height of the face index (111), in an X-ray diffraction pattern measured in such a manner that the plane including the X-ray incident direction and the diffraction direction is perpendicular to the flat surface of the soft magnetic flaky powder, and the angle between the incident direction and the flat surface is equal to the angle between the diffraction direction and the flat surface. Furthermore, the invention provides a soft magnetic flaky powder with oxide layer wherein an oxide layer of a thickness of 50 to 1000 Å is formed on the surface of this soft magnetic flaky powder.

The invention relates to a flat coil. The flat coil is a single-layer coil formed by winding a single self-adhered enameled wire form inside to outside, two wiring ends are led out of the single-layer coil, one side of the single-layer coil is in fixed contact with a magnetic shielding plate, the induction intensity of the flat coil is utilized to the greatest extent, the loss is relatively low, particularly, the flat coil is relatively high in environmental adaptability and stable is performance, and the normal operation of an electromagnetic interference device is prevented. The invention also provides a fabrication method of the flat coil and a flat coil wireless charger employing the flat coil.

The invention discloses a pressure gel forming method for a multi-winding current transformer, and belongs to the technical field of electric manufacturing and electric equipment. According to the method, the traditional method that multiple windings are shielded respectively in a device correcting process is improved, the windings are combined and wrapped as a whole, and exhaust dead corners generated in the pouring process of the multi-winding current transformer are effectively avoided. In a transformer die preparation process, temperatures of different parts of a die are set, so that it is guaranteed that the curing process of gel materials which are injected firstly and the curing process of gel materials which are injected later basically keep consistent, and cracks generated due to an inconsistent curing contraction rate in the transformer are avoided. In the pressure gel forming process, viscosity of mixed materials is large, a certain period of time is needed when gas is exhausted from the inside of a product, and accordingly a staged material injection method is adopted. Besides, staged pressure maintaining can effectively avoid the situation that iron core magnetic permeability is reduced because of excessively large material injection pressure and accordingly error tests are not qualified, and therefore product quality and the pass percent are guaranteed.

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 method for manufacturing an austenite stainless steel thin strip for an electronic product shell. Due to an alloy design of austenite stainless steel, elements generate a synergistic effect; on the basis of a large number of experiments, process parameters of smelting, hot rolling and cold rolling are optimized; proper temperature and a proper reduction rate of a smelting and B adding process, the hot rolling, the cold rolling and annealing are controlled; the optimization of the parameters in the manufacturing method is favorable for guaranteeing that the stainless steel thin strip reaches an estimated performance index, namely the hardness is greater than 280 Hv; the level of impurities is lower, namely (A+B+C+D ) is less than or equal to 2.0; needle holes and concave troughs are prevented after polishing, so the smoothness of a mirror surface is realized, and the magnetic inductivity is less than 0.6 Gs/Oe; therefore, the manufacturing method meets a requirement of an electronic element, particularly the higher and higher requirement in the field of communication devices, such as a mobile phone shell and the like.

The invention discloses high-strength wear-resistant corrosion-resistant antimagnetic stainless steel belonging to the field of alloy materials. The stainless steel comprises the following components in percentage by weight: 0.25-0.35% of C, 0.7-1.00% of Si, 0.50-1.50% of Mn, 17.00-19.00% of Cr, 11.00-13.00% of Ni, 2.00-2.50% of Mo, 0.45-0.55% of V, 0.13-0.18% of Ti, 0.10-0.15% of Nb, 0.13-0.18% of RE and 61.59-67.74% of Fe. The stainless steel disclosed by the invention is new non-magnetic steel which is non-magnetic and resistant to marine corrosion and has high strength and hardness.

The invention discloses a composite electromagnetic pulse solidification structure treatment device and method for casting of ultralumin. The treatment device comprises a metal mold, a side electromagnetic pulse device and a top electromagnetic pulse device, wherein an inner chamber of the metal mold is used for storing a melt; the sidewall of the metal mold comprises an outer layer and an inner layer; a water cooling cavity is formed between the outer layer and the inner layer; a cooling water inlet is formed in the bottom part of the water cooling cavity, and a cooling water outlet is formed in the top part of the water cooling cavity; the side electromagnetic pulse device is arranged at the outer wall of the metal mold; the top electromagnetic pulse device is positioned right above the inner chamber of the metal mold. According to the composite electromagnetic pulse solidification structure treatment device for casting of the ultralumin, electromagnetic energy can enter the melt to the maximum, so that the metal mold can be uniformly preheated, and the core structure of an ultra-thick casting can be uniformly thinned through the electromagnetic energy while the solidification supercooling degree of a casting blank is improved.

The invention discloses a manufacturing method of a nanocrystalline magnetic core for a high-frequency electrostatic dust collection power transformer. The manufacturing method sequentially comprises the following steps that an iron-based nanocrystalline band is adopted to be wound into the rectangular nanocrystalline magnetic core, the thickness of the iron-based nanocrystalline band is smaller than 25 micrometers, the width of the iron-based nanocrystalline band is 40 mm to 60 mm, and the lamination factor is larger than or equal to 70 percent; two stages of heat preservation heat treatment of magnetic-field-free annealing and inert gas shielding are carried out on the rectangular nanocrystalline magnetic core, the temperature of the first stage is 450 DEG C to 480 DEG C, heat preservation is carried out for 60 min to 90 min, the temperature of the second stage is 520 DEG C to 550 DEG C, and heat preservation is carried out for 60 min to 90 min; natural cooling is carried out; epoxy resin immersion treatment is carried out on the cooled rectangular nanocrystalline magnetic core in a vacuum impregnation mode, and the vacuum degree is 0.6 Mpa to 0.8 Mpa; the rectangular nanocrystalline magnetic core immersed in epoxy resin is cured through a three-stage heat preservation method, the temperature of the first stage is 80 DEG C, heat preservation is carried out for 60 min to 90 min, the temperature of the second stage is 120 DEG C, heat preservation is carried out for 120 min, the temperature of the third stage is 150 DEG C to 160 DEG C, and heat preservation is carried out for 120 min; natural cooling is carried out.

The invention relates to a detection machine for detecting whether packaged food contains deoxidizing agent or not and a detection method thereof. The detection machine comprises a machine frame and a conveying device which is installed on the machine frame. A material sensor, a deoxidizing agent sensor and a cleaning mechanism are arranged on the machine frame. When the material sensor detects that when the packaged food to be detected passes, a trigger signal is sent to a timing switch controller which is arranged on the machine frame, a timer of the timing switch controller is triggered to begin timing, and the timer presets timing value T. When the deoxidizing agent sensor detects the packaged food containing the deoxidizing agent, a reset signal is sent to the timing switch controller. The cleaning mechanism is used for popping packaged food without the deoxidizing agent out of the conveying device, and power-on action or power-off waiting of the cleaning mechanism is controlled by the timing switch controller. Automation detection is adopted by the detection machine, so that the detection machine is high in efficiency, low in labor intensity, simple in structure and low in manufacturing cost and saves cost. The detection method is accurate and reliable, easy to achieve and high in efficiency.

A coil component is constituted by a composite magnetic material containing alloy grains whose oxygen atom concentration in their surfaces is 50 percent or less, and resin, and also by a coil. The coil component using the composite magnetic material does not require high pressure when formed.

The invention provides an inductor, including a first magnetic core and a second magnetic core; the first magnetic core is connected with the second magnetic core, forming a cavity. In the cavity, the first magnetic core is provided with a first magnetic pillar; the second magnetic core is also correspondingly provided with a second magnetic pillar which is coaxial with the first magnetic pillar; a certain gap is arranged between the end surfaces of the first magnetic pillar and the second magnetic pillar; and a coil is wound on the first magnetic pillar, the gap and the second magnetic pillar. A certain gap is arranged between the first magnetic pillar and the second magnetic pillar. By winding the coil on the two magnetic pillars, after being electrified, the magnetic force lines are centralized around the coil. As the current-carrying coil does not have magnetic pillars at the gap part, the generated magnetic induction lines are dispersed in the whole space; and compared with the prior art in which the coil is wound on the whole magnetic pillar, the technical proposal improves the saturation resistance capacity of the inductor and reduces the permeability.

The invention discloses a casting method of high-strength high-hardness anti-marine-corrosion non-magnetic steel and belongs to the field of alloy materials. The method includes the steps of heating to melt raw iron in a smelter which is a medium-frequency induction furnace, at the melting temperature of 1450 DEG C-1550 DEG C, sequentially adding nickel, ferrochromium, ferrovanadium and ferroniobium into the smelter after full melting, controlling the content ratio of the element components to be satisfactory, melting down, performing deoxidation, dehydrogenation and denitrification when the furnace temperature reaches 1550 DEG C-1580 DEG C, pressuring deoxidant deep in the smelter, adding ferrotitanium, covering the surface of melt with covering agent to isolate external air, and adding rare-earth ferrosilicon into a ladle. The casting method is applied to novel non-magnetic steel which is non-magnetic, resistant to marine corrosion, and high in strength and hardness.

The invention discloses a electronic transformer, characterized in that the electronic transformer comprises: a coil winding rack, above or below which through holes are provided, and a plurality of pins are provided at a bottom face of the coil winding rack; two E type iron cores whose middle posts are respectively inserted into the upper and lower through holes of the coil winding rack; a winding, which is wound on the coil winding rack, and connected with an external circuit respectively through the pins. The invention replaces the traditional U type magnet iron by the E type iron core and saves structure of a steel clamp, which not only reduces cost, but also greatly lessens the magnetic conductivity.

A magnetic shielding system that includes a shield that is non-uniform in the axial direction and a shield cap that is non-uniform in the radial direction. Each shield in the system may have a magnetic permeability, thickness, and/or radius that varies in the axial direction to create low-reluctance paths that redirect flux away from a sample towards the ends of the shield. Each shield cap in the system may have a magnetic permeability and/or thickness that varies in the radial direction to create low-reluctance paths that redirect flux away from the sample towards shield walls. An inner shielding layer formed from a material of low permeability and moderate-to-high coercivity may be implemented as the innermost layer of a magnetic shielding system.

The invention discloses a heat treatment method for high-strength high-hardness marine-corrosion-resistant non-magnetic steel, belonging to the field of alloy materials. The heat treatment method comprises the following steps: (1) feeding smelted corrosion-resistant antimagnetic steel of which the temperature is no more than 500 DEG C into a heat treatment furnace; (2) heating to 600-650 DEG C at a heating rate of 80-100 DEG C/h, and keeping the constant temperature for 2-3 hours; and (3) heating to 1050-1080 DEG C at a heating rate of 80-100 DEG C/h, and keeping the constant temperature for 5-6 hours; and performing solution treatment, performing welding combination, machining, and performing stabilizing heat treatment, wherein the treatment process is specifically as follows: (1) heating to 600-630 DEG C at a heating rate of 100-120 DEG C/h, and keeping the constant temperature for 2-3 hours; and (2) heating to 820-850 DEG C at a heating rate of 100-120 DEG C/h, keeping the constant temperature for 6-8 hours, and cooling to room temperature in the furnace, thus finishing the process. The heat treatment method disclosed by the invention is used for new non-magnetic steel which is non-magnetic and resistant to marine corrosion and has high strength and hardness.

The invention relates to a method of manufacturing a rotor for an electric machine, wherein the rotor is composed of at least one electric sheet wherein at least one electric sheet is thermally treated regionally to directly modify its magnetic permeability in the treated region.