12results about How to "Reduce AC resistance" patented technology

The invention discloses a composite shielding sheet for wireless charging and a manufacturing method thereof, and the manufacturing method of the composite shielding sheet for wireless charging comprises the following steps: crushing treatment: crushing a nanocrystalline strip to obtain nanocrystalline powder; flattening treatment is carried out, the nanocrystalline powder is subjected to ball milling, and the nanocrystalline powder is subjected to ball milling until the thickness of the nanocrystalline powder is 3-6 microns; performing sieving treatment to obtain nanocrystalline powder with the sheet diameter ranging from 75 microns to 150 microns; surface activating treatment; mixing treatment: adding a resin material into a matched organic solvent, heating and stirring until the resin is completely dissolved, then adding the activated nanocrystalline powder, stirring until the powder is uniformly dispersed to form a mixture, and distilling part of the solvent to improve the viscosity of the mixture to a coating state; and coating treatment. The composite shielding sheet for wireless charging, which is prepared by adopting the manufacturing method of the composite shielding sheet for wireless charging, has the characteristics of high magnetic conductivity and high saturation magnetic induction of nanocrystalline, and can be applied to a high-power and high-frequency wireless charging system.

The invention discloses a transformer and a vehicle, and relates to the technical field of transformers. The second magnetic core is oppositely connected with the first magnetic core; the first coil is wound on the first magnetic core; the coil assembly comprises a second coil and a third coil which are wound on the second magnetic core in parallel, the first coil and the second coil are arranged in a spaced mode to form first leakage inductance, the first coil and the third coil are arranged in a spaced mode to form second leakage inductance, and the first leakage inductance and the second leakage inductance form resonant inductance. According to the technical scheme provided by the invention, the volumes of the transformer and the resonant inductor are reduced.

The invention discloses a corrugated seven-segment cable core structure, a cable structure and a production process, the corrugated seven-segment cable core structure comprises a central conductor and seven tile-shaped separation strand block conductors, and the seven tile-shaped separation strand block conductors are twisted around the central conductor to form a cable core with a circular cross section; the center conductor and the tile-shaped separation strand block conductors are isolated through graphene insulation paper, and the adjacent tile-shaped separation strand block conductors are isolated through graphene insulation paper. According to the invention, the current transmission channel is obviously increased. Meanwhile, the current transmission capability of the cable is improved by adopting a central conductor and seven-segment corrugated split conductor structure; the insulation paper doped with the graphene is used in the cable conductor, and the graphene has extremely low relative permeability, so that the magnetic flux density in the conductor is reduced, the heat energy generated by the action of a magnetic field is reduced, and the current-carrying capacity and the working efficiency of the cable are improved; and meanwhile, the current can be more uniformly distributed in the conductor, the alternating-current resistance and phase loss of the cable core are reduced, and the transmission efficiency of the cable is enhanced.

The purpose of the present invention is to reduce AC resistance. In a multilayer substrate (100), a plurality of ground electrodes (41-44) are separated from each other in the thickness direction (D1) of a laminated substrate (1), and are adjacent to a plurality of signal lines (21-24) in the width direction of the plurality of signal lines (21-24). In a first transmission line region where the maximum line width of the plurality of signal lines (21-24) is minimum, the plurality of signal lines (21-24) do not overlap with any one of the plurality of ground electrodes (41-44) in the thickness direction (D1) of the laminated substrate (1). In a second transmission line region (102) in which the maximum line width of the plurality of signal lines (21-24) is the largest, one ground electrode (41) among the plurality of ground electrodes (41-44) overlaps with signal lines (22-24) other than the signal line (21) adjacent to the one ground electrode (41) among the plurality of signal lines (21-24).

The invention discloses a cable core structure, a cable structure and a manufacturing process, the cable core structure comprises a middle core wire, the periphery of the middle core wire is sequentially wrapped with a plurality of core wire layers, each core wire layer is formed by twisting a plurality of core wires, and the middle core wire and the core wires in each core wire layer adopt polyimide enameled copper wires; every two adjacent core wire layers are isolated through an insulating water-blocking tape, and the outermost core wire layer is wrapped by a wrapping tape. According to the invention, the energy transmission capability and the current-carrying capacity of the cable are obviously enhanced; an insulating water-blocking tape segmentation technology is introduced into the cable core design, so that the production process is simplified, the skin effect is effectively relieved, and the alternating-current resistance of the cable is reduced; polyimide with excellent heat resistance, solvent resistance, refrigerant resistance and high insulating property and copper with lower density and lower cost are adopted as the core wire core material of the cable, so that the manufacturing and mounting cost of the cable is reduced, and the production process is simplified.

The utility model discloses an anti-skin-effect large-section submarine cable conductor structure and a cable thereof. The anti-skin-effect large-section submarine cable conductor structure comprises a circular conductor layer and a molded line layer from inside to outside, the circular conductor layer is composed of a plurality of layers of conductor monofilaments which are twisted together and are subjected to oxidation treatment, and a longitudinal wrapping water-blocking tape is arranged outside each layer of conductor monofilaments after each layer of conductor monofilaments are twisted; the number of the molded line layers is at least two, water-blocking materials are filled among the molded line single lines in the same layer of the molded line layers, and wire enamel is sprayed among the layers. An oxidation film is arranged on the surface of each round copper conductor single line, so that the interference among the single lines is small, the eddy current effect is low, the anti-skin effect is good, and the current-carrying capacity of the conductor is strong; the outer layer adopts molded lines for water-blocking filling and paint spraying treatment, displacement deviation among the conductors is small, the insulation effect is good, the outer diameter of the conductor can be effectively reduced, and the surface electric field of the conductor is more uniform. When the cable is applied to the cable, compared with a common cable, the cable has a better water-blocking effect and larger effective current-carrying capacity.

The invention relates to the technical field of power cables, in particular to a middle-high voltage power cable for long-distance high-capacity power transmission and a preparation method of the middle-high voltage power cable for the long-distance high-capacity power transmission. The conductor shielding layer is coated on the outer wall of the layered split conductor; the insulating layer is coated on the outer wall of the conductor shielding layer; the insulating shielding layer is coated on the outer wall of the insulating layer; the buffer layer coats the outer wall of the insulation shielding layer; and the armor layer coats the outer wall of the buffer layer. The layered split conductor structure breaks through the process limitation of the number of traditional split conductor strand blocks, the composite insulation structure layer is composed of the micro-arc oxidation insulation separation layer and the composite elastic insulation rope, the ultra-thin and tough ceramic coating replaces crepe paper, the filling coefficient and the insulation reliability are improved, and through the filling buffering effect of the elastic rope, the insulation performance of the conductor is improved. And the integrity of the insulating coating under a harsh process is protected.

The invention discloses a short-circuit-resistant, heat-resistant and energy-saving busbar, belonging to the technical field of busbars. The short-circuit-resistant, heat-resistant and energy-saving busbar of the invention comprises a copper-clad aluminum tube layer, a shielding layer and an insulating layer, wherein the aluminum layer is a hollow aluminum tube with a thickness of 6 to 8 mm, the copper layer is tightly mechanically combined with the aluminum layer, the wall thickness of the copper layer is 2 to 3 mm, the thickness of the shielding layer is 4 to 5 mm, the thickness of the insulating layer is 5 to 7 mm, and the insulating layer comprises, by weight, 100 parts of silane-modified silicone rubber, 20 to 50 parts of fumed silica, and a low molecular weight organic silicon compound. 2 to 5 parts, 10 to 30 parts of polyetheretherketone, 5 to 15 parts of mullite, and 2 to 8 parts of barium titanate. The silane-modified silicone rubber is an epoxidized silicone rubber grafted with a fluorosilane coupling agent and an aminosilane coupling agent; the silicone rubber is a methyl vinyl silicone rubber, and the vinyl content of the methyl vinyl silicone rubber is ≥1.8 mol%; the mass ratio of the aminosilane coupling agent to the fluorosilane coupling agent is (2 to 3):1, and the amount of the aminosilane coupling agent and the fluorosilane coupling agent added is 50 to 70 mol% of the vinyl content of the silicone rubber.

The utility model discloses a kind of intermediate frequency DC reactors, including magnetic core, coil, input conductive row and output conductive row, the magnetic core is oppositely equipped with two iron columns, the coil is equipped with two groups and is respectively wound on the two iron columns of the magnetic core, the coil is wound with thin wide metal foil and is formed, the input conductive row is located in the lower portion of this intermediate frequency DC reactor and is connected with the coil, the output conductive row is located in the upper portion of this intermediate frequency DC reactor and is connected with the coil. The utility model winding loss is small, and the heat dissipation performance is excellent, compact structure, high reliability, strong environmental adaptability, can be adapted to intermediate frequency working condition.

The utility model relates to the technical field of cable conductors, in particular to an energy-saving consumption-reducing monofilament mixed stranded cable conductor, which comprises a conductor, the conductor comprises a plurality of buckle type special-shaped monofilaments and a plurality of circular monofilaments, the cross section of each circular monofilament is circular, and the buckle type special-shaped monofilaments are interlocked and meshed. The utility model has the following advantages: (1) buckle type special-shaped monofilaments and round monofilaments with specific specifications are produced, the number of filaments is small, the number of times of wire drawing and die changing is small, the production efficiency can reach the round monofilament wire drawing capacity and production efficiency on the premise that two wire drawing machines are matched, the capacity is high, the requirement on equipment is low, and the requirement on the operating skill of workers is not high; and (2) low-oxygen copper and oxygen-free copper are adopted, only the inner-layer circular monofilament needs to be replaced when the resistor richness is too large or too small, the inner-layer circular monofilament is easy to repair, the later-period out-of-period problems are few, the after-sale cost is reduced, and copper material consumption can be saved to the maximum extent.

A lightweight large-section conductor is composed of a compressed and twisted layer of a trapezoidal copper-clad aluminum alloy wire, a compressed and twisted layer of a trapezoidal copper conductor enameled wire, and a compressed and twisted layer of a round copper-clad aluminum alloy wire, from the inside to the outside, and a semi-conductive nylon tape is coated on the surface of the trapezoidal copper conductor enameled wire. The manufacturing method thereof comprises the following steps: Step 1, concentrically coating a pure copper tape with equal thickness on a high-performance aluminum alloy rod, and performing argon arc welding with a coating welding machine to obtain a wire; Step 2, selecting a wire drawing die set to anneal the wire in the wire drawing machine during the drawing process to form a metallurgical bond and obtain the processed wire. Step 3, after the wire is twisted by a frame twisting machine, it is compressed and formed by a die, and the semi-conductive tape is coated on the outer surface. The outer layer of the present invention adopts copper conductor monofilaments coated with insulating varnish to achieve mutual insulation between monofilaments, greatly increase the surface area, reduce the AC resistance of the conductor, and increase the current carrying capacity; the inner layer uses copper-clad aluminum alloy to replace copper, which reduces the cost.

The utility model discloses a low-energy-consumption medium-voltage cable, which relates to the technical field of medium-voltage cables and comprises a conductor, a belting layer is longitudinally wrapped on the secondary outer layer of the conductor, a conductor shielding layer is arranged on the outer layer of the conductor, a cross-linked polyethylene insulating layer is arranged on the outer surface of the conductor shielding layer, and the cross-linked polyethylene insulating layer is arranged on the outer surface of the cross-linked polyethylene insulating layer. According to the medium-voltage cable, through the arrangement of the wrapping tape layer, in the conductor twisting process of the medium-voltage cable, the non-woven fabric is longitudinally wrapped on the secondary outer layer of the conductor to form the wrapping tape layer, and the outer layer conductor and the secondary outer layer conductor are isolated by the non-woven fabric, so that the surface area of the conductor is enlarged; and meanwhile, after the non-woven fabric is longitudinally wrapped on the secondary outer layer, a barrier is formed on the secondary outer layer, and when the three layers are co-extruded, the inner screen does not enter the conductor due to extrusion pressure, so that the inner screen is not sunken, and the smoothness of a shielding interface and an insulating interface of the conductor is improved.