35results about How to "Improve eddy current loss" patented technology

The present invention provides a magnet ring device for inhibiting very fast transient overvoltage in a gas insulated switchgear. The magnet ring device comprises a magnet ring string, a copper foil adhesive tape and a fixed housing. The magnet ring string is formed by a plurality of open-loop anti-saturation magnet rings, and each two adjacent open-loop anti-saturation magnet rings are tightly connected through adhesives; each open-loop anti-saturation magnet ring is provided with an air gap; and the outer surface of the magnet ring string is coated with the copper foil adhesive tape, and the fixed housing is fixed at the outer portion of the magnet ring string. The magnet ring is provided with the air gap with the appropriate length to effectively improve the saturation characteristic of the device, cause more energy consumption for the traveling wave and reduce the VFTO (Very Fast Transient Overvoltage) value caused by operating a disconnecting switch in GIS (Gas Insulated Switchgear); the copper foil adhesive tape can effectively avoid leakage of a magnetic line, enhance the eddy current loss of the magnet ring device, reduce the influence of the VFTO on the device, improve the distribution of the electric field at the surface of the magnet ring string and avoid the partial discharge phenomenon caused by too high local field intensity. The fixed housing can improve the intensity and the rigidity of the whole magnet ring device.

The invention relates to a magnetic fluid sieving device, which mainly comprises a fluid separation sieve and a magnetic loop. The device is characterized in that magnetic wires and nonmagnetic wires in the fluid separation sieve formed by multiple layers of screen meshes in a plurality of independent fluid separation cavities under magnetic poles divide a magnetic field space into several minimal spaces of high gradient magnetic potentials and an equal magnetic potential; magnetic particles in a fluid are enriched in the high gradient magnetic field spaces under the action of magnetic force when the fluid flows through the fluid separation sieve; and when the magnetic poles relatively move along the direction of the nonmagnetic wires, the magnetic particles are acted by the magnetic force of the magnetic poles, move with the magnetic poles along a direction nearly orthogonal to a fluid flow channel, and are separated out. The magnetic fluid sieving device of the invention has the advantages of realization of continuous and efficient separation of the magnetic particles from the fluid, low operation energy consumption, and simple maintenance, and can be used for environmental protection, magnetic metal recovery, and magnetic mineral sorting.

The invention provides a magnetic core material and its preparation method and application. The magnetic core material includes a first magnetic powder, a second magnetic powder and a third magnetic powder bonded and mixed by a binder; the preparation method includes The following steps: (1) mixing the first magnetic powder, the second magnetic powder and the third magnetic powder to obtain a ternary magnetic powder; (2) the passivation treatment step (1) to obtain the ternary magnetic powder to obtain a passivated magnetic powder; (3) the obtained passivation magnetic powder of the coating step (2) obtains the coated magnetic powder; (4) the obtained coated magnetic powder of the bonding granulation step (3) obtains the magnetic particles; (5) the compression molding step (4 ) the obtained magnetic particles to obtain a magnetic core material. The magnetic core material provided by the invention has the characteristics of low molding pressure, high magnetic permeability and low loss, and reduces the short circuit risk of molded inductors.

The invention provides a cobalt-containing composite absorbing material and a preparation method thereof. The composite absorbing material comprises a graphene oxide matrix, ferrite, nanometer cobaltand cobaltous carbonate, and the ferrite, the nanometer cobalt and the cobaltous carbonate are loaded on the surface of the graphene oxide matrix. Results of the embodiment show that according to theobtained composite absorbing material, when the matching thickness is 2.44 mm, the maximum absorption -19.13dB is achieved during 12.32 GHz, and the effective absorption frequency band whose reflection loss is lower than -10dB reaches 4.10 GHz; and when the matching thickness is 2.40 mm, the maximum absorption -17.36dB is achieved during 13.34 GHz, the effective absorption frequency band whose reflection loss is lower than -10dB reaches 2.74 GHz, the visible absorbing frequency band is substantially widened, and the absorbing capability is enhanced.

The invention discloses a preparation method for a wave absorbing material with high magnetic conductivity. The method comprises the steps that (1) iron-base alloy powder is prepared; (2) the iron-base alloy power is treated by mixing and ball milling, so flat wave absorbing powder is obtained; and (3) a binder is added into the flat wave absorbing powder for mixing, and a target product is obtained after compression shaping, wherein the treatment of stirring and ball milling is conducted under a temperature field. By the method, ball milling efficiency can be increased effectively; an annealing step after the ball milling is simplified; surface roughness of the alloy powder is improved; finally, evenness of the shaped flat wave absorbing powder and stability of electromagnetic performance of the wave absorbing material are ensured; and the method is applicable to large-scale industrialization.

The invention discloses a horizontal linear vibration motor, which comprises a casing, a lower cover plate is connected to the lower part of the casing, a stator assembly is connected above the lower cover plate, a vibrator assembly is arranged above the stator assembly, and the two sides of the vibrator assembly pass through The spring piece is connected to the casing, and the stator assembly includes a coil, an iron core, an FPC circuit board and a damping plate, wherein the damping plate, the FPC circuit board and the coil are stacked on top of the lower cover in sequence from bottom to top, and the iron core is set through the damping plate 1. Inside the FPC circuit board and the coil, the vibrator assembly includes a counterweight, and the interior of the counterweight is provided with two magnetic steels arranged side by side; the invention also discloses a method for realizing a horizontal linear vibration motor. The electromagnetic characteristics of the damping plate of the present invention lead to a large eddy current loss generated on the vibrator assembly when it moves, which generates reliable energy consumption for the motor to stop, and because its electromagnetic characteristics change little within the working temperature range, the motor damping does not change with the working environment temperature And obviously changed.

This invention provides a Pr series rare earth super magnetostriction material and its preparation method, and the chemical components (atomic ratios) are: Pr1-x(Tb1-yREy)x(FelMz)RE represents for Dy, Sm, Ho, Er, Ce, Nd and etc rare earth elements; M represents one or several kinds of B, Si, C, Zr, Nb, Cu, Mn, V, Ti, Cr, Ga, Co, Ni, w, Hf, Ta, Mg. (0 is less than or equal to x is less than or equal to 0.6, 0 is less than or equal to y is less than or equal to 1, 0 is less than or equal to z is less than or equal to 0.4, 0 is less than or equal to t is less than or equal to 4.) The preparation method is : use high-pressing technology to compose the Pr series rare earth super magnetostriction material with high Pr content that the usual pressure cannot realize. This invention greatly lowers the cost of the present material and maintains high magnetostriction performance.

The invention is a composite shielding structure suitable for a wireless power supply system of an electric vehicle. The structure includes an aluminum cover, an alumina ceramic heat-conducting plate, a magnetic material shielding plate, a receiving coil and a bakelite substrate; the magnetic material shielding plate includes a shielding plate chamfer and a split plate; the split plate is made of manganese-zinc power iron Oxygen and iron-based nanocrystalline alloy two kinds of magnetic materials are spliced ​​into plate structures of various shapes. The receiving coil is set between the inner frame boundary of the bakelite substrate and the outer frame boundary of the substrate, the magnetic material shielding plate is covered on the receiving coil, the alumina ceramic heat conduction plate is covered on the magnetic material shielding plate, and the aluminum cover is covered on the oxide Above the aluminum ceramic heat conduction plate, it is fixed as a whole by screws and the Bakelite substrate. The invention not only can rationally utilize the magnetic material to shield electromagnetic radiation, but also can conduct the heat generated in the charging process to ensure the effective operation of the system.

An insulating powder process for hard-passivation magnetic powder and magnetic powder prepared therefrom, the present invention relates to a novel insulation process for hard-passivation magnetic powder, and the technical scheme of the present invention is to coat the surface of hard-passivation magnetic powder first A layer of easily passivated magnetic powder forms a structure similar to "core-shell": the hard-to-passivated magnetic powder is the "core" and the easily passivated magnetic powder is the "shell", and then the coated magnetic powder is passivated. The advantages of the patent of the present invention are: 1. Passivation treatment can be performed after coating a layer of easily passivated magnetic powder on the surface of the difficult-to-passivated magnetic powder, a uniform and dense passivation film can be formed on the surface, and the insulation performance is high. The reliability of electronic components manufactured by magnetic powder is greatly improved; 2. The magnetic permeability, saturation magnetic flux density, coercivity, eddy current loss, and pressing performance of the magnetic powder processed by this process have been improved.