286results about How to "Improve electrical strength" patented technology

The invention relates to an insulating paint for a variable frequency motor and a preparation method thereof. The insulating paint comprises the main components: unsaturated polyester resin, epoxy resin, cross-linking monomer, initiator, acid anhydride curing agent, polymerization inhibitor and filler. The preparation method comprises the steps of: preparing materials according to the components in part by weight, mixing base materials uniformly for later use, treating the filler and mixing and treating the base materials and the filler. The invention has the advantages that: the insulating paint is suitable for the variable frequency motor, in particular a high-power variable frequency motor; an insulating paint film has excellent mechanical property, good compatibility with electromagnetic wires, long pulse-resistant time, high electrical strength, low dielectric loss, good chemical stability resistance and high heat conductivity; and the preparation method for the insulating paint can ensure the quality of the produced insulating paint for the variable frequency motor.

An insulated DC-cable and method for production of an insulated DC-cable with an insulating system comprising an extruded cross-linked polyethylene based insulation disposed around the conductor. The extruded polyethylene based compound comprises additives such as cross-linking agent, scorch retarding agent and antioxidant. The scorch retarding agent comprises a compound (D), 2,4-diphenyl-4-methyl-pentene-1 and the antioxidant comprises a compound (C), a diester of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionicacid and thiodiglycol. The compounded polyethylene based resin composition is extruded and cross-linked at a temperature and for a period of time sufficient enough to cross link the insulation. The temperature and the period of time upon extrusion and cross-linking are limited so as to substantially suppress or essentially avoid undesired polar by-products being formed in the cross-linked composition.

A mica-based insulation based on impregnating resin for rotating electrical machines is provided. The mica-based impregnating resin includes an epoxy resin/anhydride mixture and a nanoparticulate filler, wherein the nanoparticulate filler is a nanoparticulate silicon dioxide and/or aluminum oxide modified by a silanizing reagent. Further, a method of producing the mica-based impregnating resin is provided.

A multilayer ceramic electronic component that is small, that has high electrical strength, and that is resistant to separation between ceramic layers includes a ceramic sintered body having a substantially rectangular parallelepiped shape and a plurality of first and second internal electrodes. The plurality of first and second internal electrodes are alternately arranged so as to face each other. The first and second internal electrodes are parallel or substantially parallel to first and second major surfaces. The first and second internal electrodes are exposed to at least one of the fifth and sixth surfaces and are not exposed to the third or fourth surface. No bends exist in any of the ends of each of the first and second internal electrodes adjacent to the third and fourth surfaces.

The invention discloses a vacuum glue-dipping insulation pipe without air gaps and a manufacturing method thereof, relates to an insulation pipe and a manufacturing method thereof, and solves the problems of poor electrical property and mechanical property of the insulation pipe caused by air bubbles, gaps and local layering produced easily among layers of glass fabrics in the prior manufacturing process of the insulation pipe. The insulation pipe is formed by winding the glass fabrics, resin glue is dipped in the glass fabrics, and the resin glue is prepared by stirring the following components in portion by weight at the temperature of between 50 and 80 DEG C: 100 portions of modified epoxy resin, 85 portions of curing agent, 10 portions of toughening agent and 3 portions of accelerating agent. The method comprises the following steps: first, designing a core die; second, winding the glass fabrics; third, glue dipping; fourth, primary curing; five, demoulding; six, secondary curing; and seven, removing burrs to obtain the vacuum glue-dipping insulation pipe without the air gaps. The insulation pipe is formed by glue dipping under a vacuum state, and the air bubbles, the gaps and the local layering are not produced among layers of the glass fabrics, so the electrical property and the mechanical property of the insulation pipe are improved.

A lightning arrester for protecting elements of electrical facilities or a power transmission line comprises an insulating body which is made of a solid dielectric, preferably in the form of a bar, a strip or a cylinder, two main electrodes that are mechanically coupled to the insulating body and two or more intermediate electrodes. The intermediate electrodes, preferably made in the form of bars or cylinders, are arranged between the main electrodes so that said intermediate electrodes are mutually shifted along the longitudinal axis of the insulating body or along a spiral line. Such design makes it possible to form a discharge channel between the adjacent electrodes. Furthermore, said electrodes are located inside the insulating body and are separated from the surface of the body by an insulation layer. Discharge chambers formed as cavities or through bores opened to the surface of the insulating body are arranged between the pairs of the adjacent electrodes. Dimensions of the chambers are selected such that a discharge is easily blown out from the chambers to the surface of the insulating body, thereby increasing the efficiency of the discharge current quenching. In the preferred embodiments, the arrester is provided with an additional electrode for reducing a flashover voltage. Various embodiments of a power transmission line using the arrester of the invention are also disclosed.

The invention discloses the preparation methods of a barium strontium titanate / polyimide dielectric with the materials of adjustable thick composite, uses polyimide as a precursor; Selecting the barium strontium titanate powder dielectric ceramics (Ba1-xSrx) TiO3 as dielectric adjustable phase, polyimide precursors and the surface treatment of barium strontium titanate dielectric ceramic powder mixed in proportion, by using a high-energy or ordinary ball milling way to make them adequately scattered and get mixed thick-film paste;Using conventional spin-coating process, dipping - carrying process or extension of thick slurry will be mixed in the pre-treatment of the coating material on the substrate, and then coating on the substrate material after the heat treatment process and follow-up process can be get Barium strontium titanate / polyimide dielectric adjustable thick composite materials. This invention need a low processing temperature (=< 350 degree C), the minimum curing temperature is less than 160 degree C.

The invention belongs to the technical field of electric porcelain brown glaze toner, and particularly discloses brown glaze. The brown glaze comprises the following raw materials of, in parts by mass, 18-26 parts of potassium feldspar, 6-14 parts of albite, 2-8 parts of Inner Mongolia soil, 10-18 parts of Shaanxi kaolin, 7-12 parts of calcined talc, 0-3 parts of limestone, 25-33 parts of quartz powder, 1-1.6 parts of iron oxide red, 0.4-1.2 parts of chromium oxide and 7-12 parts of manganese oxide. The invention furthermore discloses a production method of the brown glaze. The production method of the brown glaze comprises the following steps of (1) raw material preparation, (2) ball-milling, (3) deironing treatment and (4) aging. According to the brown glaze produced by using the production method, the product yield is improved, the brown glaze has good comprehensive performance, and the production cost is effectively reduced so that the market requirements can be well met.

A high-frequency dielectric ceramics sintered at low temp has a structure expressing formula: (Bi3xZn2-3x)(Znx-y/3Nb2-x-2y/3May)O7 and (Bi3xZn2-3x)(ZnxNb2-x-yMby)O7, where Ma=Sn or Zn, Mb=Sb, Ta, or Mo, x=0.45-0.67 and y=0-1.5. Its advantages are high dielectric coefficient (25-8), low medium loss, low sintering temp (840-1060 deg.C), high insulating resistance, and wide range of temp coefficients.

A high-dielectric strength leadless energy storage dielectric ceramic material and a preparation method thereof belong to the technical fields of electronic information functional materials and devices. The high-dielectric strength leadless energy storage dielectric ceramic material is characterized in that the composition formula of the material is (Sr0.7Ba0.3)aR6-aX2+aY8-aO30, wherein X is Nb<5+> or Ta<5+>, Y is Ti<4+> or Zr<4+>, R is a trivalent rare earth element, and the value of a is 4 or 5. The material achieves a high dielectric strength, realizes a high energy storage efficiency, saves the energy cost, and has a wide application prospect.

The invention discloses a beautified radome and a preparation method thereof. The method comprises steps: stirring and mixing a thermosetting synthetic resin solution and a modified filling material to form a required slurry, wherein the mass of the filling material is 5% to 15% of that of the slurry; fully dipping reinforced fiber in the slurry after the reinforced fiber is braided in a plain, a twill, or a satin braiding mode; preparing a glass fiber composite layer, and coating the glass fiber composite layer on the reinforced fiber dipped with the slurry; introducing the reinforced fiber dipped with the slurry and covered with the glass fiber composite layer into a mold, and heating the mold to make the reinforced fiber solidified; and pulling out the solidified reinforced fiber from a mold outlet to be shaped, and assembling the shaped reinforced fiber. With the method of the invention, a pattern layer for beautifying the radome, and a radome body are integrally molded, a repeated painting beautification technology in a late stage is reduced, the resource is saved, and the defect of the present spraying technology is overcome.

The invention discloses a beautification antenna housing and a preparation method thereof. The preparation method comprises the steps of: stirring and mixing thermosetting synthetic resin solution and modified filler to form required slurry, wherein the mass of the filler is 2.5-9.7% the mass of the slurry; preparing a fiberglass composite layer, wherein the fiberglass composite layer comprises an inner layer and an outer layer, the inner layer is made of pure fiberglass felt and the outer layer is a surface felt adhered with patterns which are designed according to the application environment and used for hiding or deceiving the antenna housing; sequentially coating the slurry on multiple pieces of reinforcing fiber cloth; and adhering the inner layer of the fiberglass composite layer to the outmost reinforcing fiber cloth coated with the slurry, and integrally curing the multiple pieces of reinforcing fiber cloth and the fiberglass composite layer. According to the invention, the pattern layer of the beautification antenna housing and an antenna housing body are integrally formed by a hand pasting process, so that the late-stage repeated spray painting beautification process is reduced, the resources are saved and the defects of the traditional spray coating process are overcome.

The invention relates to a fluorine-containing polymer, particularly a preparation method of a PVDF (polyvinylidene fluoride) film and a PVDF film. The preparation method of the high-beta-phase-content PVDF film comprises the following steps: dissolving PVDF raw powder in a mixed solvent composed of a good solvent and a poor solvent, regulating the width of a flow casting scraper slit, carrying out flow casting on a clean glass plate or polyester film strip, and carrying out bottom plate heat drying to prepare the high-beta-phase-crystal-content PVDF film. The method can adopt the mixed solvent to control the crystalline state of the PVDF. The obtained PVDF film has the advantages of high beta-phase crystal content, high compactness, no pore, high dielectric strength and high dielectric constant, and can be used for preparing high-energy-density capacitors.

A portable therapeutic field generator device (10) generates a reduced magnetic field component for a relatively large electric field by virtue that adjacent conductive tracks in a radiating element (40, 50) conduct electrical current in opposing directions. The device (10) includes a processor (12) that, in response to a control algorithm stored in memory (14), supplies a pulse wave (22) to a circuit containing the radiating element (40, 50). The pulse establishes generation of a base heartbeat reference having a frequency around a nominal heart rate. At periodic times, the base heart beat reference is supplemented by mutually exclusive periods of alpha wave, theta wave and delta wave generation (or other selected frequencies below about 200 Hz) based on selected brainwave frequencies for these waves, with the pulses having a duration generally corresponding to that ascribed to neuron depolarisation pulses. The device (10) cycles through multiple cycles (88) and, dependent upon the effect that is desired, may see delta wave frequencies follow theta wave frequencies that follow alpha wave frequencies. Delays may exist between transitions between the generated waves, with delta wave generation occurring no later than sixty minutes from commencement of alpha wave production for a mode that induces sleep. Delta waves production has, typically, a duration that is twice that of either the alpha or theta wave production. A second mode of operation sees longer pulse times for higher frequencies—between about 100 Hz and 500 Hz—associated with muscle stimulation.

The invention relates to a method for producing a semiconductor component, the method comprising the method steps of irradiating the front side (101) of a semiconductor body (100) with energetic particles using a connecting electrode (40) as a mask in order to Recombination centers (80A, 80B) for recombining charge carriers of the first and second conductivity type are generated in the semiconductor body (100).

Dispersing glass powder possessing insulation property on organic medium evenly with or without inorganic pigment being added forms the invented pulp. Viscosity and rheological property of the pulp can be adjusted to suit specific coating method such as silkscreen printing and spray coating. Feasible manufacturability of the pulp is obtained by designing formulation of glass and organic medium reasonably. Technical parameters of the pulp are: sintering temperature 540-600 deg.C, average thermal expansion coefficient of insulated medium layer (73 minus or plus 3)*10 to the power -7/C. The invented pulp is applicable to Al2O3 ceramic wafer or general conduction film substrate glass. Using method of silkscreen printing and spray coating makes wet film through drying and sintering processes etc. forming insulation layer in thick film circuit. The insulation layer provides high electrical intensity.

The invention discloses a 6 kilovolt level high-voltage motor insulation structure and a manufacturing method of the insulation structure. The insulation structure comprises an electromagnetic coil provided with a guide line insulating layer, and a main insulating layer manufactured on the electromagnetic coil in a winding mode. Epoxy acid anhydride type impregnating resin condensates are arranged in a gap between the guide line insulating layer on the electromagnetic coil and the main insulating layer. The 6 kilovolt level high-voltage motor insulation structure and the manufacturing method of the insulation structure have the advantages that insulating strength of the guide line insulating layer and the main insulating layer are both greatly promoted, but insulating thickness of the guide line insulating layer and the main insulating layer are obviously thinned.